Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 10762 insertions, 0 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
new file mode 100644
index 0000000000..e8b52e3690
--- /dev/null
+++ b/fs/nfs/nfs4proc.c
@@ -0,0 +1,10762 @@
+/*
+ *  fs/nfs/nfs4proc.c
+ *
+ *  Client-side procedure declarations for NFSv4.
+ *
+ *  Copyright (c) 2002 The Regents of the University of Michigan.
+ *  All rights reserved.
+ *
+ *  Kendrick Smith <kmsmith@umich.edu>
+ *  Andy Adamson   <andros@umich.edu>
+ *
+ *  Redistribution and use in source and binary forms, with or without
+ *  modification, are permitted provided that the following conditions
+ *  are met:
+ *
+ *  1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *  2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ *     documentation and/or other materials provided with the distribution.
+ *  3. Neither the name of the University nor the names of its
+ *     contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <linux/mm.h>
+#include <linux/delay.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/ratelimit.h>
+#include <linux/printk.h>
+#include <linux/slab.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/nfs.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_page.h>
+#include <linux/nfs_mount.h>
+#include <linux/namei.h>
+#include <linux/mount.h>
+#include <linux/module.h>
+#include <linux/xattr.h>
+#include <linux/utsname.h>
+#include <linux/freezer.h>
+#include <linux/iversion.h>
+
+#include "nfs4_fs.h"
+#include "delegation.h"
+#include "internal.h"
+#include "iostat.h"
+#include "callback.h"
+#include "pnfs.h"
+#include "netns.h"
+#include "sysfs.h"
+#include "nfs4idmap.h"
+#include "nfs4session.h"
+#include "fscache.h"
+#include "nfs42.h"
+
+#include "nfs4trace.h"
+
+#define NFSDBG_FACILITY		NFSDBG_PROC
+
+#define NFS4_BITMASK_SZ		3
+
+#define NFS4_POLL_RETRY_MIN	(HZ/10)
+#define NFS4_POLL_RETRY_MAX	(15*HZ)
+
+/* file attributes which can be mapped to nfs attributes */
+#define NFS4_VALID_ATTRS (ATTR_MODE \
+	| ATTR_UID \
+	| ATTR_GID \
+	| ATTR_SIZE \
+	| ATTR_ATIME \
+	| ATTR_MTIME \
+	| ATTR_CTIME \
+	| ATTR_ATIME_SET \
+	| ATTR_MTIME_SET)
+
+struct nfs4_opendata;
+static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
+static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
+static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
+static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
+			      struct nfs_fattr *fattr, struct inode *inode);
+static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
+			    struct nfs_fattr *fattr, struct iattr *sattr,
+			    struct nfs_open_context *ctx, struct nfs4_label *ilabel);
+#ifdef CONFIG_NFS_V4_1
+static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
+		const struct cred *cred,
+		struct nfs4_slot *slot,
+		bool is_privileged);
+static int nfs41_test_stateid(struct nfs_server *, nfs4_stateid *,
+		const struct cred *);
+static int nfs41_free_stateid(struct nfs_server *, const nfs4_stateid *,
+		const struct cred *, bool);
+#endif
+
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+static inline struct nfs4_label *
+nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
+	struct iattr *sattr, struct nfs4_label *label)
+{
+	int err;
+
+	if (label == NULL)
+		return NULL;
+
+	if (nfs_server_capable(dir, NFS_CAP_SECURITY_LABEL) == 0)
+		return NULL;
+
+	label->lfs = 0;
+	label->pi = 0;
+	label->len = 0;
+	label->label = NULL;
+
+	err = security_dentry_init_security(dentry, sattr->ia_mode,
+				&dentry->d_name, NULL,
+				(void **)&label->label, &label->len);
+	if (err == 0)
+		return label;
+
+	return NULL;
+}
+static inline void
+nfs4_label_release_security(struct nfs4_label *label)
+{
+	if (label)
+		security_release_secctx(label->label, label->len);
+}
+static inline u32 *nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
+{
+	if (label)
+		return server->attr_bitmask;
+
+	return server->attr_bitmask_nl;
+}
+#else
+static inline struct nfs4_label *
+nfs4_label_init_security(struct inode *dir, struct dentry *dentry,
+	struct iattr *sattr, struct nfs4_label *l)
+{ return NULL; }
+static inline void
+nfs4_label_release_security(struct nfs4_label *label)
+{ return; }
+static inline u32 *
+nfs4_bitmask(struct nfs_server *server, struct nfs4_label *label)
+{ return server->attr_bitmask; }
+#endif
+
+/* Prevent leaks of NFSv4 errors into userland */
+static int nfs4_map_errors(int err)
+{
+	if (err >= -1000)
+		return err;
+	switch (err) {
+	case -NFS4ERR_RESOURCE:
+	case -NFS4ERR_LAYOUTTRYLATER:
+	case -NFS4ERR_RECALLCONFLICT:
+	case -NFS4ERR_RETURNCONFLICT:
+		return -EREMOTEIO;
+	case -NFS4ERR_WRONGSEC:
+	case -NFS4ERR_WRONG_CRED:
+		return -EPERM;
+	case -NFS4ERR_BADOWNER:
+	case -NFS4ERR_BADNAME:
+		return -EINVAL;
+	case -NFS4ERR_SHARE_DENIED:
+		return -EACCES;
+	case -NFS4ERR_MINOR_VERS_MISMATCH:
+		return -EPROTONOSUPPORT;
+	case -NFS4ERR_FILE_OPEN:
+		return -EBUSY;
+	case -NFS4ERR_NOT_SAME:
+		return -ENOTSYNC;
+	default:
+		dprintk("%s could not handle NFSv4 error %d\n",
+				__func__, -err);
+		break;
+	}
+	return -EIO;
+}
+
+/*
+ * This is our standard bitmap for GETATTR requests.
+ */
+const u32 nfs4_fattr_bitmap[3] = {
+	FATTR4_WORD0_TYPE
+	| FATTR4_WORD0_CHANGE
+	| FATTR4_WORD0_SIZE
+	| FATTR4_WORD0_FSID
+	| FATTR4_WORD0_FILEID,
+	FATTR4_WORD1_MODE
+	| FATTR4_WORD1_NUMLINKS
+	| FATTR4_WORD1_OWNER
+	| FATTR4_WORD1_OWNER_GROUP
+	| FATTR4_WORD1_RAWDEV
+	| FATTR4_WORD1_SPACE_USED
+	| FATTR4_WORD1_TIME_ACCESS
+	| FATTR4_WORD1_TIME_METADATA
+	| FATTR4_WORD1_TIME_MODIFY
+	| FATTR4_WORD1_MOUNTED_ON_FILEID,
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+	FATTR4_WORD2_SECURITY_LABEL
+#endif
+};
+
+static const u32 nfs4_pnfs_open_bitmap[3] = {
+	FATTR4_WORD0_TYPE
+	| FATTR4_WORD0_CHANGE
+	| FATTR4_WORD0_SIZE
+	| FATTR4_WORD0_FSID
+	| FATTR4_WORD0_FILEID,
+	FATTR4_WORD1_MODE
+	| FATTR4_WORD1_NUMLINKS
+	| FATTR4_WORD1_OWNER
+	| FATTR4_WORD1_OWNER_GROUP
+	| FATTR4_WORD1_RAWDEV
+	| FATTR4_WORD1_SPACE_USED
+	| FATTR4_WORD1_TIME_ACCESS
+	| FATTR4_WORD1_TIME_METADATA
+	| FATTR4_WORD1_TIME_MODIFY,
+	FATTR4_WORD2_MDSTHRESHOLD
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+	| FATTR4_WORD2_SECURITY_LABEL
+#endif
+};
+
+static const u32 nfs4_open_noattr_bitmap[3] = {
+	FATTR4_WORD0_TYPE
+	| FATTR4_WORD0_FILEID,
+};
+
+const u32 nfs4_statfs_bitmap[3] = {
+	FATTR4_WORD0_FILES_AVAIL
+	| FATTR4_WORD0_FILES_FREE
+	| FATTR4_WORD0_FILES_TOTAL,
+	FATTR4_WORD1_SPACE_AVAIL
+	| FATTR4_WORD1_SPACE_FREE
+	| FATTR4_WORD1_SPACE_TOTAL
+};
+
+const u32 nfs4_pathconf_bitmap[3] = {
+	FATTR4_WORD0_MAXLINK
+	| FATTR4_WORD0_MAXNAME,
+	0
+};
+
+const u32 nfs4_fsinfo_bitmap[3] = { FATTR4_WORD0_MAXFILESIZE
+			| FATTR4_WORD0_MAXREAD
+			| FATTR4_WORD0_MAXWRITE
+			| FATTR4_WORD0_LEASE_TIME,
+			FATTR4_WORD1_TIME_DELTA
+			| FATTR4_WORD1_FS_LAYOUT_TYPES,
+			FATTR4_WORD2_LAYOUT_BLKSIZE
+			| FATTR4_WORD2_CLONE_BLKSIZE
+			| FATTR4_WORD2_CHANGE_ATTR_TYPE
+			| FATTR4_WORD2_XATTR_SUPPORT
+};
+
+const u32 nfs4_fs_locations_bitmap[3] = {
+	FATTR4_WORD0_CHANGE
+	| FATTR4_WORD0_SIZE
+	| FATTR4_WORD0_FSID
+	| FATTR4_WORD0_FILEID
+	| FATTR4_WORD0_FS_LOCATIONS,
+	FATTR4_WORD1_OWNER
+	| FATTR4_WORD1_OWNER_GROUP
+	| FATTR4_WORD1_RAWDEV
+	| FATTR4_WORD1_SPACE_USED
+	| FATTR4_WORD1_TIME_ACCESS
+	| FATTR4_WORD1_TIME_METADATA
+	| FATTR4_WORD1_TIME_MODIFY
+	| FATTR4_WORD1_MOUNTED_ON_FILEID,
+};
+
+static void nfs4_bitmap_copy_adjust(__u32 *dst, const __u32 *src,
+				    struct inode *inode, unsigned long flags)
+{
+	unsigned long cache_validity;
+
+	memcpy(dst, src, NFS4_BITMASK_SZ*sizeof(*dst));
+	if (!inode || !nfs4_have_delegation(inode, FMODE_READ))
+		return;
+
+	cache_validity = READ_ONCE(NFS_I(inode)->cache_validity) | flags;
+
+	/* Remove the attributes over which we have full control */
+	dst[1] &= ~FATTR4_WORD1_RAWDEV;
+	if (!(cache_validity & NFS_INO_INVALID_SIZE))
+		dst[0] &= ~FATTR4_WORD0_SIZE;
+
+	if (!(cache_validity & NFS_INO_INVALID_CHANGE))
+		dst[0] &= ~FATTR4_WORD0_CHANGE;
+
+	if (!(cache_validity & NFS_INO_INVALID_MODE))
+		dst[1] &= ~FATTR4_WORD1_MODE;
+	if (!(cache_validity & NFS_INO_INVALID_OTHER))
+		dst[1] &= ~(FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP);
+}
+
+static void nfs4_setup_readdir(u64 cookie, __be32 *verifier, struct dentry *dentry,
+		struct nfs4_readdir_arg *readdir)
+{
+	unsigned int attrs = FATTR4_WORD0_FILEID | FATTR4_WORD0_TYPE;
+	__be32 *start, *p;
+
+	if (cookie > 2) {
+		readdir->cookie = cookie;
+		memcpy(&readdir->verifier, verifier, sizeof(readdir->verifier));
+		return;
+	}
+
+	readdir->cookie = 0;
+	memset(&readdir->verifier, 0, sizeof(readdir->verifier));
+	if (cookie == 2)
+		return;
+	
+	/*
+	 * NFSv4 servers do not return entries for '.' and '..'
+	 * Therefore, we fake these entries here.  We let '.'
+	 * have cookie 0 and '..' have cookie 1.  Note that
+	 * when talking to the server, we always send cookie 0
+	 * instead of 1 or 2.
+	 */
+	start = p = kmap_atomic(*readdir->pages);
+	
+	if (cookie == 0) {
+		*p++ = xdr_one;                                  /* next */
+		*p++ = xdr_zero;                   /* cookie, first word */
+		*p++ = xdr_one;                   /* cookie, second word */
+		*p++ = xdr_one;                             /* entry len */
+		memcpy(p, ".\0\0\0", 4);                        /* entry */
+		p++;
+		*p++ = xdr_one;                         /* bitmap length */
+		*p++ = htonl(attrs);                           /* bitmap */
+		*p++ = htonl(12);             /* attribute buffer length */
+		*p++ = htonl(NF4DIR);
+		p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry)));
+	}
+	
+	*p++ = xdr_one;                                  /* next */
+	*p++ = xdr_zero;                   /* cookie, first word */
+	*p++ = xdr_two;                   /* cookie, second word */
+	*p++ = xdr_two;                             /* entry len */
+	memcpy(p, "..\0\0", 4);                         /* entry */
+	p++;
+	*p++ = xdr_one;                         /* bitmap length */
+	*p++ = htonl(attrs);                           /* bitmap */
+	*p++ = htonl(12);             /* attribute buffer length */
+	*p++ = htonl(NF4DIR);
+	p = xdr_encode_hyper(p, NFS_FILEID(d_inode(dentry->d_parent)));
+
+	readdir->pgbase = (char *)p - (char *)start;
+	readdir->count -= readdir->pgbase;
+	kunmap_atomic(start);
+}
+
+static void nfs4_fattr_set_prechange(struct nfs_fattr *fattr, u64 version)
+{
+	if (!(fattr->valid & NFS_ATTR_FATTR_PRECHANGE)) {
+		fattr->pre_change_attr = version;
+		fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
+	}
+}
+
+static void nfs4_test_and_free_stateid(struct nfs_server *server,
+		nfs4_stateid *stateid,
+		const struct cred *cred)
+{
+	const struct nfs4_minor_version_ops *ops = server->nfs_client->cl_mvops;
+
+	ops->test_and_free_expired(server, stateid, cred);
+}
+
+static void __nfs4_free_revoked_stateid(struct nfs_server *server,
+		nfs4_stateid *stateid,
+		const struct cred *cred)
+{
+	stateid->type = NFS4_REVOKED_STATEID_TYPE;
+	nfs4_test_and_free_stateid(server, stateid, cred);
+}
+
+static void nfs4_free_revoked_stateid(struct nfs_server *server,
+		const nfs4_stateid *stateid,
+		const struct cred *cred)
+{
+	nfs4_stateid tmp;
+
+	nfs4_stateid_copy(&tmp, stateid);
+	__nfs4_free_revoked_stateid(server, &tmp, cred);
+}
+
+static long nfs4_update_delay(long *timeout)
+{
+	long ret;
+	if (!timeout)
+		return NFS4_POLL_RETRY_MAX;
+	if (*timeout <= 0)
+		*timeout = NFS4_POLL_RETRY_MIN;
+	if (*timeout > NFS4_POLL_RETRY_MAX)
+		*timeout = NFS4_POLL_RETRY_MAX;
+	ret = *timeout;
+	*timeout <<= 1;
+	return ret;
+}
+
+static int nfs4_delay_killable(long *timeout)
+{
+	might_sleep();
+
+	__set_current_state(TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
+	schedule_timeout(nfs4_update_delay(timeout));
+	if (!__fatal_signal_pending(current))
+		return 0;
+	return -EINTR;
+}
+
+static int nfs4_delay_interruptible(long *timeout)
+{
+	might_sleep();
+
+	__set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE_UNSAFE);
+	schedule_timeout(nfs4_update_delay(timeout));
+	if (!signal_pending(current))
+		return 0;
+	return __fatal_signal_pending(current) ? -EINTR :-ERESTARTSYS;
+}
+
+static int nfs4_delay(long *timeout, bool interruptible)
+{
+	if (interruptible)
+		return nfs4_delay_interruptible(timeout);
+	return nfs4_delay_killable(timeout);
+}
+
+static const nfs4_stateid *
+nfs4_recoverable_stateid(const nfs4_stateid *stateid)
+{
+	if (!stateid)
+		return NULL;
+	switch (stateid->type) {
+	case NFS4_OPEN_STATEID_TYPE:
+	case NFS4_LOCK_STATEID_TYPE:
+	case NFS4_DELEGATION_STATEID_TYPE:
+		return stateid;
+	default:
+		break;
+	}
+	return NULL;
+}
+
+/* This is the error handling routine for processes that are allowed
+ * to sleep.
+ */
+static int nfs4_do_handle_exception(struct nfs_server *server,
+		int errorcode, struct nfs4_exception *exception)
+{
+	struct nfs_client *clp = server->nfs_client;
+	struct nfs4_state *state = exception->state;
+	const nfs4_stateid *stateid;
+	struct inode *inode = exception->inode;
+	int ret = errorcode;
+
+	exception->delay = 0;
+	exception->recovering = 0;
+	exception->retry = 0;
+
+	stateid = nfs4_recoverable_stateid(exception->stateid);
+	if (stateid == NULL && state != NULL)
+		stateid = nfs4_recoverable_stateid(&state->stateid);
+
+	switch(errorcode) {
+		case 0:
+			return 0;
+		case -NFS4ERR_BADHANDLE:
+		case -ESTALE:
+			if (inode != NULL && S_ISREG(inode->i_mode))
+				pnfs_destroy_layout(NFS_I(inode));
+			break;
+		case -NFS4ERR_DELEG_REVOKED:
+		case -NFS4ERR_ADMIN_REVOKED:
+		case -NFS4ERR_EXPIRED:
+		case -NFS4ERR_BAD_STATEID:
+		case -NFS4ERR_PARTNER_NO_AUTH:
+			if (inode != NULL && stateid != NULL) {
+				nfs_inode_find_state_and_recover(inode,
+						stateid);
+				goto wait_on_recovery;
+			}
+			fallthrough;
+		case -NFS4ERR_OPENMODE:
+			if (inode) {
+				int err;
+
+				err = nfs_async_inode_return_delegation(inode,
+						stateid);
+				if (err == 0)
+					goto wait_on_recovery;
+				if (stateid != NULL && stateid->type == NFS4_DELEGATION_STATEID_TYPE) {
+					exception->retry = 1;
+					break;
+				}
+			}
+			if (state == NULL)
+				break;
+			ret = nfs4_schedule_stateid_recovery(server, state);
+			if (ret < 0)
+				break;
+			goto wait_on_recovery;
+		case -NFS4ERR_STALE_STATEID:
+		case -NFS4ERR_STALE_CLIENTID:
+			nfs4_schedule_lease_recovery(clp);
+			goto wait_on_recovery;
+		case -NFS4ERR_MOVED:
+			ret = nfs4_schedule_migration_recovery(server);
+			if (ret < 0)
+				break;
+			goto wait_on_recovery;
+		case -NFS4ERR_LEASE_MOVED:
+			nfs4_schedule_lease_moved_recovery(clp);
+			goto wait_on_recovery;
+#if defined(CONFIG_NFS_V4_1)
+		case -NFS4ERR_BADSESSION:
+		case -NFS4ERR_BADSLOT:
+		case -NFS4ERR_BAD_HIGH_SLOT:
+		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+		case -NFS4ERR_DEADSESSION:
+		case -NFS4ERR_SEQ_FALSE_RETRY:
+		case -NFS4ERR_SEQ_MISORDERED:
+			/* Handled in nfs41_sequence_process() */
+			goto wait_on_recovery;
+#endif /* defined(CONFIG_NFS_V4_1) */
+		case -NFS4ERR_FILE_OPEN:
+			if (exception->timeout > HZ) {
+				/* We have retried a decent amount, time to
+				 * fail
+				 */
+				ret = -EBUSY;
+				break;
+			}
+			fallthrough;
+		case -NFS4ERR_DELAY:
+			nfs_inc_server_stats(server, NFSIOS_DELAY);
+			fallthrough;
+		case -NFS4ERR_GRACE:
+		case -NFS4ERR_LAYOUTTRYLATER:
+		case -NFS4ERR_RECALLCONFLICT:
+		case -NFS4ERR_RETURNCONFLICT:
+			exception->delay = 1;
+			return 0;
+
+		case -NFS4ERR_RETRY_UNCACHED_REP:
+		case -NFS4ERR_OLD_STATEID:
+			exception->retry = 1;
+			break;
+		case -NFS4ERR_BADOWNER:
+			/* The following works around a Linux server bug! */
+		case -NFS4ERR_BADNAME:
+			if (server->caps & NFS_CAP_UIDGID_NOMAP) {
+				server->caps &= ~NFS_CAP_UIDGID_NOMAP;
+				exception->retry = 1;
+				printk(KERN_WARNING "NFS: v4 server %s "
+						"does not accept raw "
+						"uid/gids. "
+						"Reenabling the idmapper.\n",
+						server->nfs_client->cl_hostname);
+			}
+	}
+	/* We failed to handle the error */
+	return nfs4_map_errors(ret);
+wait_on_recovery:
+	exception->recovering = 1;
+	return 0;
+}
+
+/* This is the error handling routine for processes that are allowed
+ * to sleep.
+ */
+int nfs4_handle_exception(struct nfs_server *server, int errorcode, struct nfs4_exception *exception)
+{
+	struct nfs_client *clp = server->nfs_client;
+	int ret;
+
+	ret = nfs4_do_handle_exception(server, errorcode, exception);
+	if (exception->delay) {
+		ret = nfs4_delay(&exception->timeout,
+				exception->interruptible);
+		goto out_retry;
+	}
+	if (exception->recovering) {
+		if (exception->task_is_privileged)
+			return -EDEADLOCK;
+		ret = nfs4_wait_clnt_recover(clp);
+		if (test_bit(NFS_MIG_FAILED, &server->mig_status))
+			return -EIO;
+		goto out_retry;
+	}
+	return ret;
+out_retry:
+	if (ret == 0)
+		exception->retry = 1;
+	return ret;
+}
+
+static int
+nfs4_async_handle_exception(struct rpc_task *task, struct nfs_server *server,
+		int errorcode, struct nfs4_exception *exception)
+{
+	struct nfs_client *clp = server->nfs_client;
+	int ret;
+
+	ret = nfs4_do_handle_exception(server, errorcode, exception);
+	if (exception->delay) {
+		rpc_delay(task, nfs4_update_delay(&exception->timeout));
+		goto out_retry;
+	}
+	if (exception->recovering) {
+		if (exception->task_is_privileged)
+			return -EDEADLOCK;
+		rpc_sleep_on(&clp->cl_rpcwaitq, task, NULL);
+		if (test_bit(NFS4CLNT_MANAGER_RUNNING, &clp->cl_state) == 0)
+			rpc_wake_up_queued_task(&clp->cl_rpcwaitq, task);
+		goto out_retry;
+	}
+	if (test_bit(NFS_MIG_FAILED, &server->mig_status))
+		ret = -EIO;
+	return ret;
+out_retry:
+	if (ret == 0) {
+		exception->retry = 1;
+		/*
+		 * For NFS4ERR_MOVED, the client transport will need to
+		 * be recomputed after migration recovery has completed.
+		 */
+		if (errorcode == -NFS4ERR_MOVED)
+			rpc_task_release_transport(task);
+	}
+	return ret;
+}
+
+int
+nfs4_async_handle_error(struct rpc_task *task, struct nfs_server *server,
+			struct nfs4_state *state, long *timeout)
+{
+	struct nfs4_exception exception = {
+		.state = state,
+	};
+
+	if (task->tk_status >= 0)
+		return 0;
+	if (timeout)
+		exception.timeout = *timeout;
+	task->tk_status = nfs4_async_handle_exception(task, server,
+			task->tk_status,
+			&exception);
+	if (exception.delay && timeout)
+		*timeout = exception.timeout;
+	if (exception.retry)
+		return -EAGAIN;
+	return 0;
+}
+
+/*
+ * Return 'true' if 'clp' is using an rpc_client that is integrity protected
+ * or 'false' otherwise.
+ */
+static bool _nfs4_is_integrity_protected(struct nfs_client *clp)
+{
+	rpc_authflavor_t flavor = clp->cl_rpcclient->cl_auth->au_flavor;
+	return (flavor == RPC_AUTH_GSS_KRB5I) || (flavor == RPC_AUTH_GSS_KRB5P);
+}
+
+static void do_renew_lease(struct nfs_client *clp, unsigned long timestamp)
+{
+	spin_lock(&clp->cl_lock);
+	if (time_before(clp->cl_last_renewal,timestamp))
+		clp->cl_last_renewal = timestamp;
+	spin_unlock(&clp->cl_lock);
+}
+
+static void renew_lease(const struct nfs_server *server, unsigned long timestamp)
+{
+	struct nfs_client *clp = server->nfs_client;
+
+	if (!nfs4_has_session(clp))
+		do_renew_lease(clp, timestamp);
+}
+
+struct nfs4_call_sync_data {
+	const struct nfs_server *seq_server;
+	struct nfs4_sequence_args *seq_args;
+	struct nfs4_sequence_res *seq_res;
+};
+
+void nfs4_init_sequence(struct nfs4_sequence_args *args,
+			struct nfs4_sequence_res *res, int cache_reply,
+			int privileged)
+{
+	args->sa_slot = NULL;
+	args->sa_cache_this = cache_reply;
+	args->sa_privileged = privileged;
+
+	res->sr_slot = NULL;
+}
+
+static void nfs40_sequence_free_slot(struct nfs4_sequence_res *res)
+{
+	struct nfs4_slot *slot = res->sr_slot;
+	struct nfs4_slot_table *tbl;
+
+	tbl = slot->table;
+	spin_lock(&tbl->slot_tbl_lock);
+	if (!nfs41_wake_and_assign_slot(tbl, slot))
+		nfs4_free_slot(tbl, slot);
+	spin_unlock(&tbl->slot_tbl_lock);
+
+	res->sr_slot = NULL;
+}
+
+static int nfs40_sequence_done(struct rpc_task *task,
+			       struct nfs4_sequence_res *res)
+{
+	if (res->sr_slot != NULL)
+		nfs40_sequence_free_slot(res);
+	return 1;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+
+static void nfs41_release_slot(struct nfs4_slot *slot)
+{
+	struct nfs4_session *session;
+	struct nfs4_slot_table *tbl;
+	bool send_new_highest_used_slotid = false;
+
+	if (!slot)
+		return;
+	tbl = slot->table;
+	session = tbl->session;
+
+	/* Bump the slot sequence number */
+	if (slot->seq_done)
+		slot->seq_nr++;
+	slot->seq_done = 0;
+
+	spin_lock(&tbl->slot_tbl_lock);
+	/* Be nice to the server: try to ensure that the last transmitted
+	 * value for highest_user_slotid <= target_highest_slotid
+	 */
+	if (tbl->highest_used_slotid > tbl->target_highest_slotid)
+		send_new_highest_used_slotid = true;
+
+	if (nfs41_wake_and_assign_slot(tbl, slot)) {
+		send_new_highest_used_slotid = false;
+		goto out_unlock;
+	}
+	nfs4_free_slot(tbl, slot);
+
+	if (tbl->highest_used_slotid != NFS4_NO_SLOT)
+		send_new_highest_used_slotid = false;
+out_unlock:
+	spin_unlock(&tbl->slot_tbl_lock);
+	if (send_new_highest_used_slotid)
+		nfs41_notify_server(session->clp);
+	if (waitqueue_active(&tbl->slot_waitq))
+		wake_up_all(&tbl->slot_waitq);
+}
+
+static void nfs41_sequence_free_slot(struct nfs4_sequence_res *res)
+{
+	nfs41_release_slot(res->sr_slot);
+	res->sr_slot = NULL;
+}
+
+static void nfs4_slot_sequence_record_sent(struct nfs4_slot *slot,
+		u32 seqnr)
+{
+	if ((s32)(seqnr - slot->seq_nr_highest_sent) > 0)
+		slot->seq_nr_highest_sent = seqnr;
+}
+static void nfs4_slot_sequence_acked(struct nfs4_slot *slot, u32 seqnr)
+{
+	nfs4_slot_sequence_record_sent(slot, seqnr);
+	slot->seq_nr_last_acked = seqnr;
+}
+
+static void nfs4_probe_sequence(struct nfs_client *client, const struct cred *cred,
+				struct nfs4_slot *slot)
+{
+	struct rpc_task *task = _nfs41_proc_sequence(client, cred, slot, true);
+	if (!IS_ERR(task))
+		rpc_put_task_async(task);
+}
+
+static int nfs41_sequence_process(struct rpc_task *task,
+		struct nfs4_sequence_res *res)
+{
+	struct nfs4_session *session;
+	struct nfs4_slot *slot = res->sr_slot;
+	struct nfs_client *clp;
+	int status;
+	int ret = 1;
+
+	if (slot == NULL)
+		goto out_noaction;
+	/* don't increment the sequence number if the task wasn't sent */
+	if (!RPC_WAS_SENT(task) || slot->seq_done)
+		goto out;
+
+	session = slot->table->session;
+	clp = session->clp;
+
+	trace_nfs4_sequence_done(session, res);
+
+	status = res->sr_status;
+	if (task->tk_status == -NFS4ERR_DEADSESSION)
+		status = -NFS4ERR_DEADSESSION;
+
+	/* Check the SEQUENCE operation status */
+	switch (status) {
+	case 0:
+		/* Mark this sequence number as having been acked */
+		nfs4_slot_sequence_acked(slot, slot->seq_nr);
+		/* Update the slot's sequence and clientid lease timer */
+		slot->seq_done = 1;
+		do_renew_lease(clp, res->sr_timestamp);
+		/* Check sequence flags */
+		nfs41_handle_sequence_flag_errors(clp, res->sr_status_flags,
+				!!slot->privileged);
+		nfs41_update_target_slotid(slot->table, slot, res);
+		break;
+	case 1:
+		/*
+		 * sr_status remains 1 if an RPC level error occurred.
+		 * The server may or may not have processed the sequence
+		 * operation..
+		 */
+		nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
+		slot->seq_done = 1;
+		goto out;
+	case -NFS4ERR_DELAY:
+		/* The server detected a resend of the RPC call and
+		 * returned NFS4ERR_DELAY as per Section 2.10.6.2
+		 * of RFC5661.
+		 */
+		dprintk("%s: slot=%u seq=%u: Operation in progress\n",
+			__func__,
+			slot->slot_nr,
+			slot->seq_nr);
+		goto out_retry;
+	case -NFS4ERR_RETRY_UNCACHED_REP:
+	case -NFS4ERR_SEQ_FALSE_RETRY:
+		/*
+		 * The server thinks we tried to replay a request.
+		 * Retry the call after bumping the sequence ID.
+		 */
+		nfs4_slot_sequence_acked(slot, slot->seq_nr);
+		goto retry_new_seq;
+	case -NFS4ERR_BADSLOT:
+		/*
+		 * The slot id we used was probably retired. Try again
+		 * using a different slot id.
+		 */
+		if (slot->slot_nr < slot->table->target_highest_slotid)
+			goto session_recover;
+		goto retry_nowait;
+	case -NFS4ERR_SEQ_MISORDERED:
+		nfs4_slot_sequence_record_sent(slot, slot->seq_nr);
+		/*
+		 * Were one or more calls using this slot interrupted?
+		 * If the server never received the request, then our
+		 * transmitted slot sequence number may be too high. However,
+		 * if the server did receive the request then it might
+		 * accidentally give us a reply with a mismatched operation.
+		 * We can sort this out by sending a lone sequence operation
+		 * to the server on the same slot.
+		 */
+		if ((s32)(slot->seq_nr - slot->seq_nr_last_acked) > 1) {
+			slot->seq_nr--;
+			if (task->tk_msg.rpc_proc != &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE]) {
+				nfs4_probe_sequence(clp, task->tk_msg.rpc_cred, slot);
+				res->sr_slot = NULL;
+			}
+			goto retry_nowait;
+		}
+		/*
+		 * RFC5661:
+		 * A retry might be sent while the original request is
+		 * still in progress on the replier. The replier SHOULD
+		 * deal with the issue by returning NFS4ERR_DELAY as the
+		 * reply to SEQUENCE or CB_SEQUENCE operation, but
+		 * implementations MAY return NFS4ERR_SEQ_MISORDERED.
+		 *
+		 * Restart the search after a delay.
+		 */
+		slot->seq_nr = slot->seq_nr_highest_sent;
+		goto out_retry;
+	case -NFS4ERR_BADSESSION:
+	case -NFS4ERR_DEADSESSION:
+	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+		goto session_recover;
+	default:
+		/* Just update the slot sequence no. */
+		slot->seq_done = 1;
+	}
+out:
+	/* The session may be reset by one of the error handlers. */
+	dprintk("%s: Error %d free the slot \n", __func__, res->sr_status);
+out_noaction:
+	return ret;
+session_recover:
+	set_bit(NFS4_SLOT_TBL_DRAINING, &session->fc_slot_table.slot_tbl_state);
+	nfs4_schedule_session_recovery(session, status);
+	dprintk("%s ERROR: %d Reset session\n", __func__, status);
+	nfs41_sequence_free_slot(res);
+	goto out;
+retry_new_seq:
+	++slot->seq_nr;
+retry_nowait:
+	if (rpc_restart_call_prepare(task)) {
+		nfs41_sequence_free_slot(res);
+		task->tk_status = 0;
+		ret = 0;
+	}
+	goto out;
+out_retry:
+	if (!rpc_restart_call(task))
+		goto out;
+	rpc_delay(task, NFS4_POLL_RETRY_MAX);
+	return 0;
+}
+
+int nfs41_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
+{
+	if (!nfs41_sequence_process(task, res))
+		return 0;
+	if (res->sr_slot != NULL)
+		nfs41_sequence_free_slot(res);
+	return 1;
+
+}
+EXPORT_SYMBOL_GPL(nfs41_sequence_done);
+
+static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
+{
+	if (res->sr_slot == NULL)
+		return 1;
+	if (res->sr_slot->table->session != NULL)
+		return nfs41_sequence_process(task, res);
+	return nfs40_sequence_done(task, res);
+}
+
+static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
+{
+	if (res->sr_slot != NULL) {
+		if (res->sr_slot->table->session != NULL)
+			nfs41_sequence_free_slot(res);
+		else
+			nfs40_sequence_free_slot(res);
+	}
+}
+
+int nfs4_sequence_done(struct rpc_task *task, struct nfs4_sequence_res *res)
+{
+	if (res->sr_slot == NULL)
+		return 1;
+	if (!res->sr_slot->table->session)
+		return nfs40_sequence_done(task, res);
+	return nfs41_sequence_done(task, res);
+}
+EXPORT_SYMBOL_GPL(nfs4_sequence_done);
+
+static void nfs41_call_sync_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_call_sync_data *data = calldata;
+
+	dprintk("--> %s data->seq_server %p\n", __func__, data->seq_server);
+
+	nfs4_setup_sequence(data->seq_server->nfs_client,
+			    data->seq_args, data->seq_res, task);
+}
+
+static void nfs41_call_sync_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_call_sync_data *data = calldata;
+
+	nfs41_sequence_done(task, data->seq_res);
+}
+
+static const struct rpc_call_ops nfs41_call_sync_ops = {
+	.rpc_call_prepare = nfs41_call_sync_prepare,
+	.rpc_call_done = nfs41_call_sync_done,
+};
+
+#else	/* !CONFIG_NFS_V4_1 */
+
+static int nfs4_sequence_process(struct rpc_task *task, struct nfs4_sequence_res *res)
+{
+	return nfs40_sequence_done(task, res);
+}
+
+static void nfs4_sequence_free_slot(struct nfs4_sequence_res *res)
+{
+	if (res->sr_slot != NULL)
+		nfs40_sequence_free_slot(res);
+}
+
+int nfs4_sequence_done(struct rpc_task *task,
+		       struct nfs4_sequence_res *res)
+{
+	return nfs40_sequence_done(task, res);
+}
+EXPORT_SYMBOL_GPL(nfs4_sequence_done);
+
+#endif	/* !CONFIG_NFS_V4_1 */
+
+static void nfs41_sequence_res_init(struct nfs4_sequence_res *res)
+{
+	res->sr_timestamp = jiffies;
+	res->sr_status_flags = 0;
+	res->sr_status = 1;
+}
+
+static
+void nfs4_sequence_attach_slot(struct nfs4_sequence_args *args,
+		struct nfs4_sequence_res *res,
+		struct nfs4_slot *slot)
+{
+	if (!slot)
+		return;
+	slot->privileged = args->sa_privileged ? 1 : 0;
+	args->sa_slot = slot;
+
+	res->sr_slot = slot;
+}
+
+int nfs4_setup_sequence(struct nfs_client *client,
+			struct nfs4_sequence_args *args,
+			struct nfs4_sequence_res *res,
+			struct rpc_task *task)
+{
+	struct nfs4_session *session = nfs4_get_session(client);
+	struct nfs4_slot_table *tbl  = client->cl_slot_tbl;
+	struct nfs4_slot *slot;
+
+	/* slot already allocated? */
+	if (res->sr_slot != NULL)
+		goto out_start;
+
+	if (session)
+		tbl = &session->fc_slot_table;
+
+	spin_lock(&tbl->slot_tbl_lock);
+	/* The state manager will wait until the slot table is empty */
+	if (nfs4_slot_tbl_draining(tbl) && !args->sa_privileged)
+		goto out_sleep;
+
+	slot = nfs4_alloc_slot(tbl);
+	if (IS_ERR(slot)) {
+		if (slot == ERR_PTR(-ENOMEM))
+			goto out_sleep_timeout;
+		goto out_sleep;
+	}
+	spin_unlock(&tbl->slot_tbl_lock);
+
+	nfs4_sequence_attach_slot(args, res, slot);
+
+	trace_nfs4_setup_sequence(session, args);
+out_start:
+	nfs41_sequence_res_init(res);
+	rpc_call_start(task);
+	return 0;
+out_sleep_timeout:
+	/* Try again in 1/4 second */
+	if (args->sa_privileged)
+		rpc_sleep_on_priority_timeout(&tbl->slot_tbl_waitq, task,
+				jiffies + (HZ >> 2), RPC_PRIORITY_PRIVILEGED);
+	else
+		rpc_sleep_on_timeout(&tbl->slot_tbl_waitq, task,
+				NULL, jiffies + (HZ >> 2));
+	spin_unlock(&tbl->slot_tbl_lock);
+	return -EAGAIN;
+out_sleep:
+	if (args->sa_privileged)
+		rpc_sleep_on_priority(&tbl->slot_tbl_waitq, task,
+				RPC_PRIORITY_PRIVILEGED);
+	else
+		rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+	spin_unlock(&tbl->slot_tbl_lock);
+	return -EAGAIN;
+}
+EXPORT_SYMBOL_GPL(nfs4_setup_sequence);
+
+static void nfs40_call_sync_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_call_sync_data *data = calldata;
+	nfs4_setup_sequence(data->seq_server->nfs_client,
+				data->seq_args, data->seq_res, task);
+}
+
+static void nfs40_call_sync_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_call_sync_data *data = calldata;
+	nfs4_sequence_done(task, data->seq_res);
+}
+
+static const struct rpc_call_ops nfs40_call_sync_ops = {
+	.rpc_call_prepare = nfs40_call_sync_prepare,
+	.rpc_call_done = nfs40_call_sync_done,
+};
+
+static int nfs4_call_sync_custom(struct rpc_task_setup *task_setup)
+{
+	int ret;
+	struct rpc_task *task;
+
+	task = rpc_run_task(task_setup);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+
+	ret = task->tk_status;
+	rpc_put_task(task);
+	return ret;
+}
+
+static int nfs4_do_call_sync(struct rpc_clnt *clnt,
+			     struct nfs_server *server,
+			     struct rpc_message *msg,
+			     struct nfs4_sequence_args *args,
+			     struct nfs4_sequence_res *res,
+			     unsigned short task_flags)
+{
+	struct nfs_client *clp = server->nfs_client;
+	struct nfs4_call_sync_data data = {
+		.seq_server = server,
+		.seq_args = args,
+		.seq_res = res,
+	};
+	struct rpc_task_setup task_setup = {
+		.rpc_client = clnt,
+		.rpc_message = msg,
+		.callback_ops = clp->cl_mvops->call_sync_ops,
+		.callback_data = &data,
+		.flags = task_flags,
+	};
+
+	return nfs4_call_sync_custom(&task_setup);
+}
+
+static int nfs4_call_sync_sequence(struct rpc_clnt *clnt,
+				   struct nfs_server *server,
+				   struct rpc_message *msg,
+				   struct nfs4_sequence_args *args,
+				   struct nfs4_sequence_res *res)
+{
+	unsigned short task_flags = 0;
+
+	if (server->caps & NFS_CAP_MOVEABLE)
+		task_flags = RPC_TASK_MOVEABLE;
+	return nfs4_do_call_sync(clnt, server, msg, args, res, task_flags);
+}
+
+
+int nfs4_call_sync(struct rpc_clnt *clnt,
+		   struct nfs_server *server,
+		   struct rpc_message *msg,
+		   struct nfs4_sequence_args *args,
+		   struct nfs4_sequence_res *res,
+		   int cache_reply)
+{
+	nfs4_init_sequence(args, res, cache_reply, 0);
+	return nfs4_call_sync_sequence(clnt, server, msg, args, res);
+}
+
+static void
+nfs4_inc_nlink_locked(struct inode *inode)
+{
+	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
+					     NFS_INO_INVALID_CTIME |
+					     NFS_INO_INVALID_NLINK);
+	inc_nlink(inode);
+}
+
+static void
+nfs4_inc_nlink(struct inode *inode)
+{
+	spin_lock(&inode->i_lock);
+	nfs4_inc_nlink_locked(inode);
+	spin_unlock(&inode->i_lock);
+}
+
+static void
+nfs4_dec_nlink_locked(struct inode *inode)
+{
+	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
+					     NFS_INO_INVALID_CTIME |
+					     NFS_INO_INVALID_NLINK);
+	drop_nlink(inode);
+}
+
+static void
+nfs4_update_changeattr_locked(struct inode *inode,
+		struct nfs4_change_info *cinfo,
+		unsigned long timestamp, unsigned long cache_validity)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+	u64 change_attr = inode_peek_iversion_raw(inode);
+
+	cache_validity |= NFS_INO_INVALID_CTIME | NFS_INO_INVALID_MTIME;
+	if (S_ISDIR(inode->i_mode))
+		cache_validity |= NFS_INO_INVALID_DATA;
+
+	switch (NFS_SERVER(inode)->change_attr_type) {
+	case NFS4_CHANGE_TYPE_IS_UNDEFINED:
+		if (cinfo->after == change_attr)
+			goto out;
+		break;
+	default:
+		if ((s64)(change_attr - cinfo->after) >= 0)
+			goto out;
+	}
+
+	inode_set_iversion_raw(inode, cinfo->after);
+	if (!cinfo->atomic || cinfo->before != change_attr) {
+		if (S_ISDIR(inode->i_mode))
+			nfs_force_lookup_revalidate(inode);
+
+		if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
+			cache_validity |=
+				NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL |
+				NFS_INO_INVALID_SIZE | NFS_INO_INVALID_OTHER |
+				NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_NLINK |
+				NFS_INO_INVALID_MODE | NFS_INO_INVALID_XATTR;
+		nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+	}
+	nfsi->attrtimeo_timestamp = jiffies;
+	nfsi->read_cache_jiffies = timestamp;
+	nfsi->attr_gencount = nfs_inc_attr_generation_counter();
+	nfsi->cache_validity &= ~NFS_INO_INVALID_CHANGE;
+out:
+	nfs_set_cache_invalid(inode, cache_validity);
+}
+
+void
+nfs4_update_changeattr(struct inode *dir, struct nfs4_change_info *cinfo,
+		unsigned long timestamp, unsigned long cache_validity)
+{
+	spin_lock(&dir->i_lock);
+	nfs4_update_changeattr_locked(dir, cinfo, timestamp, cache_validity);
+	spin_unlock(&dir->i_lock);
+}
+
+struct nfs4_open_createattrs {
+	struct nfs4_label *label;
+	struct iattr *sattr;
+	const __u32 verf[2];
+};
+
+static bool nfs4_clear_cap_atomic_open_v1(struct nfs_server *server,
+		int err, struct nfs4_exception *exception)
+{
+	if (err != -EINVAL)
+		return false;
+	if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
+		return false;
+	server->caps &= ~NFS_CAP_ATOMIC_OPEN_V1;
+	exception->retry = 1;
+	return true;
+}
+
+static fmode_t _nfs4_ctx_to_accessmode(const struct nfs_open_context *ctx)
+{
+	 return ctx->mode & (FMODE_READ|FMODE_WRITE|FMODE_EXEC);
+}
+
+static fmode_t _nfs4_ctx_to_openmode(const struct nfs_open_context *ctx)
+{
+	fmode_t ret = ctx->mode & (FMODE_READ|FMODE_WRITE);
+
+	return (ctx->mode & FMODE_EXEC) ? FMODE_READ | ret : ret;
+}
+
+static u32
+nfs4_map_atomic_open_share(struct nfs_server *server,
+		fmode_t fmode, int openflags)
+{
+	u32 res = 0;
+
+	switch (fmode & (FMODE_READ | FMODE_WRITE)) {
+	case FMODE_READ:
+		res = NFS4_SHARE_ACCESS_READ;
+		break;
+	case FMODE_WRITE:
+		res = NFS4_SHARE_ACCESS_WRITE;
+		break;
+	case FMODE_READ|FMODE_WRITE:
+		res = NFS4_SHARE_ACCESS_BOTH;
+	}
+	if (!(server->caps & NFS_CAP_ATOMIC_OPEN_V1))
+		goto out;
+	/* Want no delegation if we're using O_DIRECT */
+	if (openflags & O_DIRECT)
+		res |= NFS4_SHARE_WANT_NO_DELEG;
+out:
+	return res;
+}
+
+static enum open_claim_type4
+nfs4_map_atomic_open_claim(struct nfs_server *server,
+		enum open_claim_type4 claim)
+{
+	if (server->caps & NFS_CAP_ATOMIC_OPEN_V1)
+		return claim;
+	switch (claim) {
+	default:
+		return claim;
+	case NFS4_OPEN_CLAIM_FH:
+		return NFS4_OPEN_CLAIM_NULL;
+	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+		return NFS4_OPEN_CLAIM_DELEGATE_CUR;
+	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
+		return NFS4_OPEN_CLAIM_DELEGATE_PREV;
+	}
+}
+
+static void nfs4_init_opendata_res(struct nfs4_opendata *p)
+{
+	p->o_res.f_attr = &p->f_attr;
+	p->o_res.seqid = p->o_arg.seqid;
+	p->c_res.seqid = p->c_arg.seqid;
+	p->o_res.server = p->o_arg.server;
+	p->o_res.access_request = p->o_arg.access;
+	nfs_fattr_init(&p->f_attr);
+	nfs_fattr_init_names(&p->f_attr, &p->owner_name, &p->group_name);
+}
+
+static struct nfs4_opendata *nfs4_opendata_alloc(struct dentry *dentry,
+		struct nfs4_state_owner *sp, fmode_t fmode, int flags,
+		const struct nfs4_open_createattrs *c,
+		enum open_claim_type4 claim,
+		gfp_t gfp_mask)
+{
+	struct dentry *parent = dget_parent(dentry);
+	struct inode *dir = d_inode(parent);
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
+	struct nfs4_label *label = (c != NULL) ? c->label : NULL;
+	struct nfs4_opendata *p;
+
+	p = kzalloc(sizeof(*p), gfp_mask);
+	if (p == NULL)
+		goto err;
+
+	p->f_attr.label = nfs4_label_alloc(server, gfp_mask);
+	if (IS_ERR(p->f_attr.label))
+		goto err_free_p;
+
+	p->a_label = nfs4_label_alloc(server, gfp_mask);
+	if (IS_ERR(p->a_label))
+		goto err_free_f;
+
+	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
+	p->o_arg.seqid = alloc_seqid(&sp->so_seqid, gfp_mask);
+	if (IS_ERR(p->o_arg.seqid))
+		goto err_free_label;
+	nfs_sb_active(dentry->d_sb);
+	p->dentry = dget(dentry);
+	p->dir = parent;
+	p->owner = sp;
+	atomic_inc(&sp->so_count);
+	p->o_arg.open_flags = flags;
+	p->o_arg.fmode = fmode & (FMODE_READ|FMODE_WRITE);
+	p->o_arg.claim = nfs4_map_atomic_open_claim(server, claim);
+	p->o_arg.share_access = nfs4_map_atomic_open_share(server,
+			fmode, flags);
+	if (flags & O_CREAT) {
+		p->o_arg.umask = current_umask();
+		p->o_arg.label = nfs4_label_copy(p->a_label, label);
+		if (c->sattr != NULL && c->sattr->ia_valid != 0) {
+			p->o_arg.u.attrs = &p->attrs;
+			memcpy(&p->attrs, c->sattr, sizeof(p->attrs));
+
+			memcpy(p->o_arg.u.verifier.data, c->verf,
+					sizeof(p->o_arg.u.verifier.data));
+		}
+	}
+	/* ask server to check for all possible rights as results
+	 * are cached */
+	switch (p->o_arg.claim) {
+	default:
+		break;
+	case NFS4_OPEN_CLAIM_NULL:
+	case NFS4_OPEN_CLAIM_FH:
+		p->o_arg.access = NFS4_ACCESS_READ | NFS4_ACCESS_MODIFY |
+				  NFS4_ACCESS_EXTEND | NFS4_ACCESS_DELETE |
+				  NFS4_ACCESS_EXECUTE |
+				  nfs_access_xattr_mask(server);
+	}
+	p->o_arg.clientid = server->nfs_client->cl_clientid;
+	p->o_arg.id.create_time = ktime_to_ns(sp->so_seqid.create_time);
+	p->o_arg.id.uniquifier = sp->so_seqid.owner_id;
+	p->o_arg.name = &dentry->d_name;
+	p->o_arg.server = server;
+	p->o_arg.bitmask = nfs4_bitmask(server, label);
+	p->o_arg.open_bitmap = &nfs4_fattr_bitmap[0];
+	switch (p->o_arg.claim) {
+	case NFS4_OPEN_CLAIM_NULL:
+	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
+	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
+		p->o_arg.fh = NFS_FH(dir);
+		break;
+	case NFS4_OPEN_CLAIM_PREVIOUS:
+	case NFS4_OPEN_CLAIM_FH:
+	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
+		p->o_arg.fh = NFS_FH(d_inode(dentry));
+	}
+	p->c_arg.fh = &p->o_res.fh;
+	p->c_arg.stateid = &p->o_res.stateid;
+	p->c_arg.seqid = p->o_arg.seqid;
+	nfs4_init_opendata_res(p);
+	kref_init(&p->kref);
+	return p;
+
+err_free_label:
+	nfs4_label_free(p->a_label);
+err_free_f:
+	nfs4_label_free(p->f_attr.label);
+err_free_p:
+	kfree(p);
+err:
+	dput(parent);
+	return NULL;
+}
+
+static void nfs4_opendata_free(struct kref *kref)
+{
+	struct nfs4_opendata *p = container_of(kref,
+			struct nfs4_opendata, kref);
+	struct super_block *sb = p->dentry->d_sb;
+
+	nfs4_lgopen_release(p->lgp);
+	nfs_free_seqid(p->o_arg.seqid);
+	nfs4_sequence_free_slot(&p->o_res.seq_res);
+	if (p->state != NULL)
+		nfs4_put_open_state(p->state);
+	nfs4_put_state_owner(p->owner);
+
+	nfs4_label_free(p->a_label);
+	nfs4_label_free(p->f_attr.label);
+
+	dput(p->dir);
+	dput(p->dentry);
+	nfs_sb_deactive(sb);
+	nfs_fattr_free_names(&p->f_attr);
+	kfree(p->f_attr.mdsthreshold);
+	kfree(p);
+}
+
+static void nfs4_opendata_put(struct nfs4_opendata *p)
+{
+	if (p != NULL)
+		kref_put(&p->kref, nfs4_opendata_free);
+}
+
+static bool nfs4_mode_match_open_stateid(struct nfs4_state *state,
+		fmode_t fmode)
+{
+	switch(fmode & (FMODE_READ|FMODE_WRITE)) {
+	case FMODE_READ|FMODE_WRITE:
+		return state->n_rdwr != 0;
+	case FMODE_WRITE:
+		return state->n_wronly != 0;
+	case FMODE_READ:
+		return state->n_rdonly != 0;
+	}
+	WARN_ON_ONCE(1);
+	return false;
+}
+
+static int can_open_cached(struct nfs4_state *state, fmode_t mode,
+		int open_mode, enum open_claim_type4 claim)
+{
+	int ret = 0;
+
+	if (open_mode & (O_EXCL|O_TRUNC))
+		goto out;
+	switch (claim) {
+	case NFS4_OPEN_CLAIM_NULL:
+	case NFS4_OPEN_CLAIM_FH:
+		goto out;
+	default:
+		break;
+	}
+	switch (mode & (FMODE_READ|FMODE_WRITE)) {
+		case FMODE_READ:
+			ret |= test_bit(NFS_O_RDONLY_STATE, &state->flags) != 0
+				&& state->n_rdonly != 0;
+			break;
+		case FMODE_WRITE:
+			ret |= test_bit(NFS_O_WRONLY_STATE, &state->flags) != 0
+				&& state->n_wronly != 0;
+			break;
+		case FMODE_READ|FMODE_WRITE:
+			ret |= test_bit(NFS_O_RDWR_STATE, &state->flags) != 0
+				&& state->n_rdwr != 0;
+	}
+out:
+	return ret;
+}
+
+static int can_open_delegated(struct nfs_delegation *delegation, fmode_t fmode,
+		enum open_claim_type4 claim)
+{
+	if (delegation == NULL)
+		return 0;
+	if ((delegation->type & fmode) != fmode)
+		return 0;
+	switch (claim) {
+	case NFS4_OPEN_CLAIM_NULL:
+	case NFS4_OPEN_CLAIM_FH:
+		break;
+	case NFS4_OPEN_CLAIM_PREVIOUS:
+		if (!test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags))
+			break;
+		fallthrough;
+	default:
+		return 0;
+	}
+	nfs_mark_delegation_referenced(delegation);
+	return 1;
+}
+
+static void update_open_stateflags(struct nfs4_state *state, fmode_t fmode)
+{
+	switch (fmode) {
+		case FMODE_WRITE:
+			state->n_wronly++;
+			break;
+		case FMODE_READ:
+			state->n_rdonly++;
+			break;
+		case FMODE_READ|FMODE_WRITE:
+			state->n_rdwr++;
+	}
+	nfs4_state_set_mode_locked(state, state->state | fmode);
+}
+
+#ifdef CONFIG_NFS_V4_1
+static bool nfs_open_stateid_recover_openmode(struct nfs4_state *state)
+{
+	if (state->n_rdonly && !test_bit(NFS_O_RDONLY_STATE, &state->flags))
+		return true;
+	if (state->n_wronly && !test_bit(NFS_O_WRONLY_STATE, &state->flags))
+		return true;
+	if (state->n_rdwr && !test_bit(NFS_O_RDWR_STATE, &state->flags))
+		return true;
+	return false;
+}
+#endif /* CONFIG_NFS_V4_1 */
+
+static void nfs_state_log_update_open_stateid(struct nfs4_state *state)
+{
+	if (test_and_clear_bit(NFS_STATE_CHANGE_WAIT, &state->flags))
+		wake_up_all(&state->waitq);
+}
+
+static void nfs_test_and_clear_all_open_stateid(struct nfs4_state *state)
+{
+	struct nfs_client *clp = state->owner->so_server->nfs_client;
+	bool need_recover = false;
+
+	if (test_and_clear_bit(NFS_O_RDONLY_STATE, &state->flags) && state->n_rdonly)
+		need_recover = true;
+	if (test_and_clear_bit(NFS_O_WRONLY_STATE, &state->flags) && state->n_wronly)
+		need_recover = true;
+	if (test_and_clear_bit(NFS_O_RDWR_STATE, &state->flags) && state->n_rdwr)
+		need_recover = true;
+	if (need_recover)
+		nfs4_state_mark_reclaim_nograce(clp, state);
+}
+
+/*
+ * Check for whether or not the caller may update the open stateid
+ * to the value passed in by stateid.
+ *
+ * Note: This function relies heavily on the server implementing
+ * RFC7530 Section 9.1.4.2, and RFC5661 Section 8.2.2
+ * correctly.
+ * i.e. The stateid seqids have to be initialised to 1, and
+ * are then incremented on every state transition.
+ */
+static bool nfs_stateid_is_sequential(struct nfs4_state *state,
+		const nfs4_stateid *stateid)
+{
+	if (test_bit(NFS_OPEN_STATE, &state->flags)) {
+		/* The common case - we're updating to a new sequence number */
+		if (nfs4_stateid_match_other(stateid, &state->open_stateid)) {
+			if (nfs4_stateid_is_next(&state->open_stateid, stateid))
+				return true;
+			return false;
+		}
+		/* The server returned a new stateid */
+	}
+	/* This is the first OPEN in this generation */
+	if (stateid->seqid == cpu_to_be32(1))
+		return true;
+	return false;
+}
+
+static void nfs_resync_open_stateid_locked(struct nfs4_state *state)
+{
+	if (!(state->n_wronly || state->n_rdonly || state->n_rdwr))
+		return;
+	if (state->n_wronly)
+		set_bit(NFS_O_WRONLY_STATE, &state->flags);
+	if (state->n_rdonly)
+		set_bit(NFS_O_RDONLY_STATE, &state->flags);
+	if (state->n_rdwr)
+		set_bit(NFS_O_RDWR_STATE, &state->flags);
+	set_bit(NFS_OPEN_STATE, &state->flags);
+}
+
+static void nfs_clear_open_stateid_locked(struct nfs4_state *state,
+		nfs4_stateid *stateid, fmode_t fmode)
+{
+	clear_bit(NFS_O_RDWR_STATE, &state->flags);
+	switch (fmode & (FMODE_READ|FMODE_WRITE)) {
+	case FMODE_WRITE:
+		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
+		break;
+	case FMODE_READ:
+		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
+		break;
+	case 0:
+		clear_bit(NFS_O_RDONLY_STATE, &state->flags);
+		clear_bit(NFS_O_WRONLY_STATE, &state->flags);
+		clear_bit(NFS_OPEN_STATE, &state->flags);
+	}
+	if (stateid == NULL)
+		return;
+	/* Handle OPEN+OPEN_DOWNGRADE races */
+	if (nfs4_stateid_match_other(stateid, &state->open_stateid) &&
+	    !nfs4_stateid_is_newer(stateid, &state->open_stateid)) {
+		nfs_resync_open_stateid_locked(state);
+		goto out;
+	}
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
+		nfs4_stateid_copy(&state->stateid, stateid);
+	nfs4_stateid_copy(&state->open_stateid, stateid);
+	trace_nfs4_open_stateid_update(state->inode, stateid, 0);
+out:
+	nfs_state_log_update_open_stateid(state);
+}
+
+static void nfs_clear_open_stateid(struct nfs4_state *state,
+	nfs4_stateid *arg_stateid,
+	nfs4_stateid *stateid, fmode_t fmode)
+{
+	write_seqlock(&state->seqlock);
+	/* Ignore, if the CLOSE argment doesn't match the current stateid */
+	if (nfs4_state_match_open_stateid_other(state, arg_stateid))
+		nfs_clear_open_stateid_locked(state, stateid, fmode);
+	write_sequnlock(&state->seqlock);
+	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
+		nfs4_schedule_state_manager(state->owner->so_server->nfs_client);
+}
+
+static void nfs_set_open_stateid_locked(struct nfs4_state *state,
+		const nfs4_stateid *stateid, nfs4_stateid *freeme)
+	__must_hold(&state->owner->so_lock)
+	__must_hold(&state->seqlock)
+	__must_hold(RCU)
+
+{
+	DEFINE_WAIT(wait);
+	int status = 0;
+	for (;;) {
+
+		if (nfs_stateid_is_sequential(state, stateid))
+			break;
+
+		if (status)
+			break;
+		/* Rely on seqids for serialisation with NFSv4.0 */
+		if (!nfs4_has_session(NFS_SERVER(state->inode)->nfs_client))
+			break;
+
+		set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
+		prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
+		/*
+		 * Ensure we process the state changes in the same order
+		 * in which the server processed them by delaying the
+		 * update of the stateid until we are in sequence.
+		 */
+		write_sequnlock(&state->seqlock);
+		spin_unlock(&state->owner->so_lock);
+		rcu_read_unlock();
+		trace_nfs4_open_stateid_update_wait(state->inode, stateid, 0);
+
+		if (!fatal_signal_pending(current)) {
+			if (schedule_timeout(5*HZ) == 0)
+				status = -EAGAIN;
+			else
+				status = 0;
+		} else
+			status = -EINTR;
+		finish_wait(&state->waitq, &wait);
+		rcu_read_lock();
+		spin_lock(&state->owner->so_lock);
+		write_seqlock(&state->seqlock);
+	}
+
+	if (test_bit(NFS_OPEN_STATE, &state->flags) &&
+	    !nfs4_stateid_match_other(stateid, &state->open_stateid)) {
+		nfs4_stateid_copy(freeme, &state->open_stateid);
+		nfs_test_and_clear_all_open_stateid(state);
+	}
+
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
+		nfs4_stateid_copy(&state->stateid, stateid);
+	nfs4_stateid_copy(&state->open_stateid, stateid);
+	trace_nfs4_open_stateid_update(state->inode, stateid, status);
+	nfs_state_log_update_open_stateid(state);
+}
+
+static void nfs_state_set_open_stateid(struct nfs4_state *state,
+		const nfs4_stateid *open_stateid,
+		fmode_t fmode,
+		nfs4_stateid *freeme)
+{
+	/*
+	 * Protect the call to nfs4_state_set_mode_locked and
+	 * serialise the stateid update
+	 */
+	write_seqlock(&state->seqlock);
+	nfs_set_open_stateid_locked(state, open_stateid, freeme);
+	switch (fmode) {
+	case FMODE_READ:
+		set_bit(NFS_O_RDONLY_STATE, &state->flags);
+		break;
+	case FMODE_WRITE:
+		set_bit(NFS_O_WRONLY_STATE, &state->flags);
+		break;
+	case FMODE_READ|FMODE_WRITE:
+		set_bit(NFS_O_RDWR_STATE, &state->flags);
+	}
+	set_bit(NFS_OPEN_STATE, &state->flags);
+	write_sequnlock(&state->seqlock);
+}
+
+static void nfs_state_clear_open_state_flags(struct nfs4_state *state)
+{
+	clear_bit(NFS_O_RDWR_STATE, &state->flags);
+	clear_bit(NFS_O_WRONLY_STATE, &state->flags);
+	clear_bit(NFS_O_RDONLY_STATE, &state->flags);
+	clear_bit(NFS_OPEN_STATE, &state->flags);
+}
+
+static void nfs_state_set_delegation(struct nfs4_state *state,
+		const nfs4_stateid *deleg_stateid,
+		fmode_t fmode)
+{
+	/*
+	 * Protect the call to nfs4_state_set_mode_locked and
+	 * serialise the stateid update
+	 */
+	write_seqlock(&state->seqlock);
+	nfs4_stateid_copy(&state->stateid, deleg_stateid);
+	set_bit(NFS_DELEGATED_STATE, &state->flags);
+	write_sequnlock(&state->seqlock);
+}
+
+static void nfs_state_clear_delegation(struct nfs4_state *state)
+{
+	write_seqlock(&state->seqlock);
+	nfs4_stateid_copy(&state->stateid, &state->open_stateid);
+	clear_bit(NFS_DELEGATED_STATE, &state->flags);
+	write_sequnlock(&state->seqlock);
+}
+
+int update_open_stateid(struct nfs4_state *state,
+		const nfs4_stateid *open_stateid,
+		const nfs4_stateid *delegation,
+		fmode_t fmode)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs_client *clp = server->nfs_client;
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	struct nfs_delegation *deleg_cur;
+	nfs4_stateid freeme = { };
+	int ret = 0;
+
+	fmode &= (FMODE_READ|FMODE_WRITE);
+
+	rcu_read_lock();
+	spin_lock(&state->owner->so_lock);
+	if (open_stateid != NULL) {
+		nfs_state_set_open_stateid(state, open_stateid, fmode, &freeme);
+		ret = 1;
+	}
+
+	deleg_cur = nfs4_get_valid_delegation(state->inode);
+	if (deleg_cur == NULL)
+		goto no_delegation;
+
+	spin_lock(&deleg_cur->lock);
+	if (rcu_dereference(nfsi->delegation) != deleg_cur ||
+	   test_bit(NFS_DELEGATION_RETURNING, &deleg_cur->flags) ||
+	    (deleg_cur->type & fmode) != fmode)
+		goto no_delegation_unlock;
+
+	if (delegation == NULL)
+		delegation = &deleg_cur->stateid;
+	else if (!nfs4_stateid_match_other(&deleg_cur->stateid, delegation))
+		goto no_delegation_unlock;
+
+	nfs_mark_delegation_referenced(deleg_cur);
+	nfs_state_set_delegation(state, &deleg_cur->stateid, fmode);
+	ret = 1;
+no_delegation_unlock:
+	spin_unlock(&deleg_cur->lock);
+no_delegation:
+	if (ret)
+		update_open_stateflags(state, fmode);
+	spin_unlock(&state->owner->so_lock);
+	rcu_read_unlock();
+
+	if (test_bit(NFS_STATE_RECLAIM_NOGRACE, &state->flags))
+		nfs4_schedule_state_manager(clp);
+	if (freeme.type != 0)
+		nfs4_test_and_free_stateid(server, &freeme,
+				state->owner->so_cred);
+
+	return ret;
+}
+
+static bool nfs4_update_lock_stateid(struct nfs4_lock_state *lsp,
+		const nfs4_stateid *stateid)
+{
+	struct nfs4_state *state = lsp->ls_state;
+	bool ret = false;
+
+	spin_lock(&state->state_lock);
+	if (!nfs4_stateid_match_other(stateid, &lsp->ls_stateid))
+		goto out_noupdate;
+	if (!nfs4_stateid_is_newer(stateid, &lsp->ls_stateid))
+		goto out_noupdate;
+	nfs4_stateid_copy(&lsp->ls_stateid, stateid);
+	ret = true;
+out_noupdate:
+	spin_unlock(&state->state_lock);
+	return ret;
+}
+
+static void nfs4_return_incompatible_delegation(struct inode *inode, fmode_t fmode)
+{
+	struct nfs_delegation *delegation;
+
+	fmode &= FMODE_READ|FMODE_WRITE;
+	rcu_read_lock();
+	delegation = nfs4_get_valid_delegation(inode);
+	if (delegation == NULL || (delegation->type & fmode) == fmode) {
+		rcu_read_unlock();
+		return;
+	}
+	rcu_read_unlock();
+	nfs4_inode_return_delegation(inode);
+}
+
+static struct nfs4_state *nfs4_try_open_cached(struct nfs4_opendata *opendata)
+{
+	struct nfs4_state *state = opendata->state;
+	struct nfs_delegation *delegation;
+	int open_mode = opendata->o_arg.open_flags;
+	fmode_t fmode = opendata->o_arg.fmode;
+	enum open_claim_type4 claim = opendata->o_arg.claim;
+	nfs4_stateid stateid;
+	int ret = -EAGAIN;
+
+	for (;;) {
+		spin_lock(&state->owner->so_lock);
+		if (can_open_cached(state, fmode, open_mode, claim)) {
+			update_open_stateflags(state, fmode);
+			spin_unlock(&state->owner->so_lock);
+			goto out_return_state;
+		}
+		spin_unlock(&state->owner->so_lock);
+		rcu_read_lock();
+		delegation = nfs4_get_valid_delegation(state->inode);
+		if (!can_open_delegated(delegation, fmode, claim)) {
+			rcu_read_unlock();
+			break;
+		}
+		/* Save the delegation */
+		nfs4_stateid_copy(&stateid, &delegation->stateid);
+		rcu_read_unlock();
+		nfs_release_seqid(opendata->o_arg.seqid);
+		if (!opendata->is_recover) {
+			ret = nfs_may_open(state->inode, state->owner->so_cred, open_mode);
+			if (ret != 0)
+				goto out;
+		}
+		ret = -EAGAIN;
+
+		/* Try to update the stateid using the delegation */
+		if (update_open_stateid(state, NULL, &stateid, fmode))
+			goto out_return_state;
+	}
+out:
+	return ERR_PTR(ret);
+out_return_state:
+	refcount_inc(&state->count);
+	return state;
+}
+
+static void
+nfs4_opendata_check_deleg(struct nfs4_opendata *data, struct nfs4_state *state)
+{
+	struct nfs_client *clp = NFS_SERVER(state->inode)->nfs_client;
+	struct nfs_delegation *delegation;
+	int delegation_flags = 0;
+
+	rcu_read_lock();
+	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
+	if (delegation)
+		delegation_flags = delegation->flags;
+	rcu_read_unlock();
+	switch (data->o_arg.claim) {
+	default:
+		break;
+	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
+	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+		pr_err_ratelimited("NFS: Broken NFSv4 server %s is "
+				   "returning a delegation for "
+				   "OPEN(CLAIM_DELEGATE_CUR)\n",
+				   clp->cl_hostname);
+		return;
+	}
+	if ((delegation_flags & 1UL<<NFS_DELEGATION_NEED_RECLAIM) == 0)
+		nfs_inode_set_delegation(state->inode,
+				data->owner->so_cred,
+				data->o_res.delegation_type,
+				&data->o_res.delegation,
+				data->o_res.pagemod_limit);
+	else
+		nfs_inode_reclaim_delegation(state->inode,
+				data->owner->so_cred,
+				data->o_res.delegation_type,
+				&data->o_res.delegation,
+				data->o_res.pagemod_limit);
+
+	if (data->o_res.do_recall)
+		nfs_async_inode_return_delegation(state->inode,
+						  &data->o_res.delegation);
+}
+
+/*
+ * Check the inode attributes against the CLAIM_PREVIOUS returned attributes
+ * and update the nfs4_state.
+ */
+static struct nfs4_state *
+_nfs4_opendata_reclaim_to_nfs4_state(struct nfs4_opendata *data)
+{
+	struct inode *inode = data->state->inode;
+	struct nfs4_state *state = data->state;
+	int ret;
+
+	if (!data->rpc_done) {
+		if (data->rpc_status)
+			return ERR_PTR(data->rpc_status);
+		return nfs4_try_open_cached(data);
+	}
+
+	ret = nfs_refresh_inode(inode, &data->f_attr);
+	if (ret)
+		return ERR_PTR(ret);
+
+	if (data->o_res.delegation_type != 0)
+		nfs4_opendata_check_deleg(data, state);
+
+	if (!update_open_stateid(state, &data->o_res.stateid,
+				NULL, data->o_arg.fmode))
+		return ERR_PTR(-EAGAIN);
+	refcount_inc(&state->count);
+
+	return state;
+}
+
+static struct inode *
+nfs4_opendata_get_inode(struct nfs4_opendata *data)
+{
+	struct inode *inode;
+
+	switch (data->o_arg.claim) {
+	case NFS4_OPEN_CLAIM_NULL:
+	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
+	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
+		if (!(data->f_attr.valid & NFS_ATTR_FATTR))
+			return ERR_PTR(-EAGAIN);
+		inode = nfs_fhget(data->dir->d_sb, &data->o_res.fh,
+				&data->f_attr);
+		break;
+	default:
+		inode = d_inode(data->dentry);
+		ihold(inode);
+		nfs_refresh_inode(inode, &data->f_attr);
+	}
+	return inode;
+}
+
+static struct nfs4_state *
+nfs4_opendata_find_nfs4_state(struct nfs4_opendata *data)
+{
+	struct nfs4_state *state;
+	struct inode *inode;
+
+	inode = nfs4_opendata_get_inode(data);
+	if (IS_ERR(inode))
+		return ERR_CAST(inode);
+	if (data->state != NULL && data->state->inode == inode) {
+		state = data->state;
+		refcount_inc(&state->count);
+	} else
+		state = nfs4_get_open_state(inode, data->owner);
+	iput(inode);
+	if (state == NULL)
+		state = ERR_PTR(-ENOMEM);
+	return state;
+}
+
+static struct nfs4_state *
+_nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
+{
+	struct nfs4_state *state;
+
+	if (!data->rpc_done) {
+		state = nfs4_try_open_cached(data);
+		trace_nfs4_cached_open(data->state);
+		goto out;
+	}
+
+	state = nfs4_opendata_find_nfs4_state(data);
+	if (IS_ERR(state))
+		goto out;
+
+	if (data->o_res.delegation_type != 0)
+		nfs4_opendata_check_deleg(data, state);
+	if (!update_open_stateid(state, &data->o_res.stateid,
+				NULL, data->o_arg.fmode)) {
+		nfs4_put_open_state(state);
+		state = ERR_PTR(-EAGAIN);
+	}
+out:
+	nfs_release_seqid(data->o_arg.seqid);
+	return state;
+}
+
+static struct nfs4_state *
+nfs4_opendata_to_nfs4_state(struct nfs4_opendata *data)
+{
+	struct nfs4_state *ret;
+
+	if (data->o_arg.claim == NFS4_OPEN_CLAIM_PREVIOUS)
+		ret =_nfs4_opendata_reclaim_to_nfs4_state(data);
+	else
+		ret = _nfs4_opendata_to_nfs4_state(data);
+	nfs4_sequence_free_slot(&data->o_res.seq_res);
+	return ret;
+}
+
+static struct nfs_open_context *
+nfs4_state_find_open_context_mode(struct nfs4_state *state, fmode_t mode)
+{
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	struct nfs_open_context *ctx;
+
+	rcu_read_lock();
+	list_for_each_entry_rcu(ctx, &nfsi->open_files, list) {
+		if (ctx->state != state)
+			continue;
+		if ((ctx->mode & mode) != mode)
+			continue;
+		if (!get_nfs_open_context(ctx))
+			continue;
+		rcu_read_unlock();
+		return ctx;
+	}
+	rcu_read_unlock();
+	return ERR_PTR(-ENOENT);
+}
+
+static struct nfs_open_context *
+nfs4_state_find_open_context(struct nfs4_state *state)
+{
+	struct nfs_open_context *ctx;
+
+	ctx = nfs4_state_find_open_context_mode(state, FMODE_READ|FMODE_WRITE);
+	if (!IS_ERR(ctx))
+		return ctx;
+	ctx = nfs4_state_find_open_context_mode(state, FMODE_WRITE);
+	if (!IS_ERR(ctx))
+		return ctx;
+	return nfs4_state_find_open_context_mode(state, FMODE_READ);
+}
+
+static struct nfs4_opendata *nfs4_open_recoverdata_alloc(struct nfs_open_context *ctx,
+		struct nfs4_state *state, enum open_claim_type4 claim)
+{
+	struct nfs4_opendata *opendata;
+
+	opendata = nfs4_opendata_alloc(ctx->dentry, state->owner, 0, 0,
+			NULL, claim, GFP_NOFS);
+	if (opendata == NULL)
+		return ERR_PTR(-ENOMEM);
+	opendata->state = state;
+	refcount_inc(&state->count);
+	return opendata;
+}
+
+static int nfs4_open_recover_helper(struct nfs4_opendata *opendata,
+				    fmode_t fmode)
+{
+	struct nfs4_state *newstate;
+	struct nfs_server *server = NFS_SB(opendata->dentry->d_sb);
+	int openflags = opendata->o_arg.open_flags;
+	int ret;
+
+	if (!nfs4_mode_match_open_stateid(opendata->state, fmode))
+		return 0;
+	opendata->o_arg.fmode = fmode;
+	opendata->o_arg.share_access =
+		nfs4_map_atomic_open_share(server, fmode, openflags);
+	memset(&opendata->o_res, 0, sizeof(opendata->o_res));
+	memset(&opendata->c_res, 0, sizeof(opendata->c_res));
+	nfs4_init_opendata_res(opendata);
+	ret = _nfs4_recover_proc_open(opendata);
+	if (ret != 0)
+		return ret; 
+	newstate = nfs4_opendata_to_nfs4_state(opendata);
+	if (IS_ERR(newstate))
+		return PTR_ERR(newstate);
+	if (newstate != opendata->state)
+		ret = -ESTALE;
+	nfs4_close_state(newstate, fmode);
+	return ret;
+}
+
+static int nfs4_open_recover(struct nfs4_opendata *opendata, struct nfs4_state *state)
+{
+	int ret;
+
+	/* memory barrier prior to reading state->n_* */
+	smp_rmb();
+	ret = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
+	if (ret != 0)
+		return ret;
+	ret = nfs4_open_recover_helper(opendata, FMODE_WRITE);
+	if (ret != 0)
+		return ret;
+	ret = nfs4_open_recover_helper(opendata, FMODE_READ);
+	if (ret != 0)
+		return ret;
+	/*
+	 * We may have performed cached opens for all three recoveries.
+	 * Check if we need to update the current stateid.
+	 */
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0 &&
+	    !nfs4_stateid_match(&state->stateid, &state->open_stateid)) {
+		write_seqlock(&state->seqlock);
+		if (test_bit(NFS_DELEGATED_STATE, &state->flags) == 0)
+			nfs4_stateid_copy(&state->stateid, &state->open_stateid);
+		write_sequnlock(&state->seqlock);
+	}
+	return 0;
+}
+
+/*
+ * OPEN_RECLAIM:
+ * 	reclaim state on the server after a reboot.
+ */
+static int _nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs_delegation *delegation;
+	struct nfs4_opendata *opendata;
+	fmode_t delegation_type = 0;
+	int status;
+
+	opendata = nfs4_open_recoverdata_alloc(ctx, state,
+			NFS4_OPEN_CLAIM_PREVIOUS);
+	if (IS_ERR(opendata))
+		return PTR_ERR(opendata);
+	rcu_read_lock();
+	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
+	if (delegation != NULL && test_bit(NFS_DELEGATION_NEED_RECLAIM, &delegation->flags) != 0)
+		delegation_type = delegation->type;
+	rcu_read_unlock();
+	opendata->o_arg.u.delegation_type = delegation_type;
+	status = nfs4_open_recover(opendata, state);
+	nfs4_opendata_put(opendata);
+	return status;
+}
+
+static int nfs4_do_open_reclaim(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = _nfs4_do_open_reclaim(ctx, state);
+		trace_nfs4_open_reclaim(ctx, 0, err);
+		if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
+			continue;
+		if (err != -NFS4ERR_DELAY)
+			break;
+		nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int nfs4_open_reclaim(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	struct nfs_open_context *ctx;
+	int ret;
+
+	ctx = nfs4_state_find_open_context(state);
+	if (IS_ERR(ctx))
+		return -EAGAIN;
+	clear_bit(NFS_DELEGATED_STATE, &state->flags);
+	nfs_state_clear_open_state_flags(state);
+	ret = nfs4_do_open_reclaim(ctx, state);
+	put_nfs_open_context(ctx);
+	return ret;
+}
+
+static int nfs4_handle_delegation_recall_error(struct nfs_server *server, struct nfs4_state *state, const nfs4_stateid *stateid, struct file_lock *fl, int err)
+{
+	switch (err) {
+		default:
+			printk(KERN_ERR "NFS: %s: unhandled error "
+					"%d.\n", __func__, err);
+			fallthrough;
+		case 0:
+		case -ENOENT:
+		case -EAGAIN:
+		case -ESTALE:
+		case -ETIMEDOUT:
+			break;
+		case -NFS4ERR_BADSESSION:
+		case -NFS4ERR_BADSLOT:
+		case -NFS4ERR_BAD_HIGH_SLOT:
+		case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+		case -NFS4ERR_DEADSESSION:
+			return -EAGAIN;
+		case -NFS4ERR_STALE_CLIENTID:
+		case -NFS4ERR_STALE_STATEID:
+			/* Don't recall a delegation if it was lost */
+			nfs4_schedule_lease_recovery(server->nfs_client);
+			return -EAGAIN;
+		case -NFS4ERR_MOVED:
+			nfs4_schedule_migration_recovery(server);
+			return -EAGAIN;
+		case -NFS4ERR_LEASE_MOVED:
+			nfs4_schedule_lease_moved_recovery(server->nfs_client);
+			return -EAGAIN;
+		case -NFS4ERR_DELEG_REVOKED:
+		case -NFS4ERR_ADMIN_REVOKED:
+		case -NFS4ERR_EXPIRED:
+		case -NFS4ERR_BAD_STATEID:
+		case -NFS4ERR_OPENMODE:
+			nfs_inode_find_state_and_recover(state->inode,
+					stateid);
+			nfs4_schedule_stateid_recovery(server, state);
+			return -EAGAIN;
+		case -NFS4ERR_DELAY:
+		case -NFS4ERR_GRACE:
+			ssleep(1);
+			return -EAGAIN;
+		case -ENOMEM:
+		case -NFS4ERR_DENIED:
+			if (fl) {
+				struct nfs4_lock_state *lsp = fl->fl_u.nfs4_fl.owner;
+				if (lsp)
+					set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
+			}
+			return 0;
+	}
+	return err;
+}
+
+int nfs4_open_delegation_recall(struct nfs_open_context *ctx,
+		struct nfs4_state *state, const nfs4_stateid *stateid)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_opendata *opendata;
+	int err = 0;
+
+	opendata = nfs4_open_recoverdata_alloc(ctx, state,
+			NFS4_OPEN_CLAIM_DELEG_CUR_FH);
+	if (IS_ERR(opendata))
+		return PTR_ERR(opendata);
+	nfs4_stateid_copy(&opendata->o_arg.u.delegation, stateid);
+	if (!test_bit(NFS_O_RDWR_STATE, &state->flags)) {
+		err = nfs4_open_recover_helper(opendata, FMODE_READ|FMODE_WRITE);
+		if (err)
+			goto out;
+	}
+	if (!test_bit(NFS_O_WRONLY_STATE, &state->flags)) {
+		err = nfs4_open_recover_helper(opendata, FMODE_WRITE);
+		if (err)
+			goto out;
+	}
+	if (!test_bit(NFS_O_RDONLY_STATE, &state->flags)) {
+		err = nfs4_open_recover_helper(opendata, FMODE_READ);
+		if (err)
+			goto out;
+	}
+	nfs_state_clear_delegation(state);
+out:
+	nfs4_opendata_put(opendata);
+	return nfs4_handle_delegation_recall_error(server, state, stateid, NULL, err);
+}
+
+static void nfs4_open_confirm_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+
+	nfs4_setup_sequence(data->o_arg.server->nfs_client,
+			   &data->c_arg.seq_args, &data->c_res.seq_res, task);
+}
+
+static void nfs4_open_confirm_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+
+	nfs40_sequence_done(task, &data->c_res.seq_res);
+
+	data->rpc_status = task->tk_status;
+	if (data->rpc_status == 0) {
+		nfs4_stateid_copy(&data->o_res.stateid, &data->c_res.stateid);
+		nfs_confirm_seqid(&data->owner->so_seqid, 0);
+		renew_lease(data->o_res.server, data->timestamp);
+		data->rpc_done = true;
+	}
+}
+
+static void nfs4_open_confirm_release(void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+	struct nfs4_state *state = NULL;
+
+	/* If this request hasn't been cancelled, do nothing */
+	if (!data->cancelled)
+		goto out_free;
+	/* In case of error, no cleanup! */
+	if (!data->rpc_done)
+		goto out_free;
+	state = nfs4_opendata_to_nfs4_state(data);
+	if (!IS_ERR(state))
+		nfs4_close_state(state, data->o_arg.fmode);
+out_free:
+	nfs4_opendata_put(data);
+}
+
+static const struct rpc_call_ops nfs4_open_confirm_ops = {
+	.rpc_call_prepare = nfs4_open_confirm_prepare,
+	.rpc_call_done = nfs4_open_confirm_done,
+	.rpc_release = nfs4_open_confirm_release,
+};
+
+/*
+ * Note: On error, nfs4_proc_open_confirm will free the struct nfs4_opendata
+ */
+static int _nfs4_proc_open_confirm(struct nfs4_opendata *data)
+{
+	struct nfs_server *server = NFS_SERVER(d_inode(data->dir));
+	struct rpc_task *task;
+	struct  rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_CONFIRM],
+		.rpc_argp = &data->c_arg,
+		.rpc_resp = &data->c_res,
+		.rpc_cred = data->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_open_confirm_ops,
+		.callback_data = data,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
+	};
+	int status;
+
+	nfs4_init_sequence(&data->c_arg.seq_args, &data->c_res.seq_res, 1,
+				data->is_recover);
+	kref_get(&data->kref);
+	data->rpc_done = false;
+	data->rpc_status = 0;
+	data->timestamp = jiffies;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = rpc_wait_for_completion_task(task);
+	if (status != 0) {
+		data->cancelled = true;
+		smp_wmb();
+	} else
+		status = data->rpc_status;
+	rpc_put_task(task);
+	return status;
+}
+
+static void nfs4_open_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+	struct nfs4_state_owner *sp = data->owner;
+	struct nfs_client *clp = sp->so_server->nfs_client;
+	enum open_claim_type4 claim = data->o_arg.claim;
+
+	if (nfs_wait_on_sequence(data->o_arg.seqid, task) != 0)
+		goto out_wait;
+	/*
+	 * Check if we still need to send an OPEN call, or if we can use
+	 * a delegation instead.
+	 */
+	if (data->state != NULL) {
+		struct nfs_delegation *delegation;
+
+		if (can_open_cached(data->state, data->o_arg.fmode,
+					data->o_arg.open_flags, claim))
+			goto out_no_action;
+		rcu_read_lock();
+		delegation = nfs4_get_valid_delegation(data->state->inode);
+		if (can_open_delegated(delegation, data->o_arg.fmode, claim))
+			goto unlock_no_action;
+		rcu_read_unlock();
+	}
+	/* Update client id. */
+	data->o_arg.clientid = clp->cl_clientid;
+	switch (claim) {
+	default:
+		break;
+	case NFS4_OPEN_CLAIM_PREVIOUS:
+	case NFS4_OPEN_CLAIM_DELEG_CUR_FH:
+	case NFS4_OPEN_CLAIM_DELEG_PREV_FH:
+		data->o_arg.open_bitmap = &nfs4_open_noattr_bitmap[0];
+		fallthrough;
+	case NFS4_OPEN_CLAIM_FH:
+		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_NOATTR];
+	}
+	data->timestamp = jiffies;
+	if (nfs4_setup_sequence(data->o_arg.server->nfs_client,
+				&data->o_arg.seq_args,
+				&data->o_res.seq_res,
+				task) != 0)
+		nfs_release_seqid(data->o_arg.seqid);
+
+	/* Set the create mode (note dependency on the session type) */
+	data->o_arg.createmode = NFS4_CREATE_UNCHECKED;
+	if (data->o_arg.open_flags & O_EXCL) {
+		data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE4_1;
+		if (clp->cl_mvops->minor_version == 0) {
+			data->o_arg.createmode = NFS4_CREATE_EXCLUSIVE;
+			/* don't put an ACCESS op in OPEN compound if O_EXCL,
+			 * because ACCESS will return permission denied for
+			 * all bits until close */
+			data->o_res.access_request = data->o_arg.access = 0;
+		} else if (nfs4_has_persistent_session(clp))
+			data->o_arg.createmode = NFS4_CREATE_GUARDED;
+	}
+	return;
+unlock_no_action:
+	trace_nfs4_cached_open(data->state);
+	rcu_read_unlock();
+out_no_action:
+	task->tk_action = NULL;
+out_wait:
+	nfs4_sequence_done(task, &data->o_res.seq_res);
+}
+
+static void nfs4_open_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+
+	data->rpc_status = task->tk_status;
+
+	if (!nfs4_sequence_process(task, &data->o_res.seq_res))
+		return;
+
+	if (task->tk_status == 0) {
+		if (data->o_res.f_attr->valid & NFS_ATTR_FATTR_TYPE) {
+			switch (data->o_res.f_attr->mode & S_IFMT) {
+			case S_IFREG:
+				break;
+			case S_IFLNK:
+				data->rpc_status = -ELOOP;
+				break;
+			case S_IFDIR:
+				data->rpc_status = -EISDIR;
+				break;
+			default:
+				data->rpc_status = -ENOTDIR;
+			}
+		}
+		renew_lease(data->o_res.server, data->timestamp);
+		if (!(data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM))
+			nfs_confirm_seqid(&data->owner->so_seqid, 0);
+	}
+	data->rpc_done = true;
+}
+
+static void nfs4_open_release(void *calldata)
+{
+	struct nfs4_opendata *data = calldata;
+	struct nfs4_state *state = NULL;
+
+	/* If this request hasn't been cancelled, do nothing */
+	if (!data->cancelled)
+		goto out_free;
+	/* In case of error, no cleanup! */
+	if (data->rpc_status != 0 || !data->rpc_done)
+		goto out_free;
+	/* In case we need an open_confirm, no cleanup! */
+	if (data->o_res.rflags & NFS4_OPEN_RESULT_CONFIRM)
+		goto out_free;
+	state = nfs4_opendata_to_nfs4_state(data);
+	if (!IS_ERR(state))
+		nfs4_close_state(state, data->o_arg.fmode);
+out_free:
+	nfs4_opendata_put(data);
+}
+
+static const struct rpc_call_ops nfs4_open_ops = {
+	.rpc_call_prepare = nfs4_open_prepare,
+	.rpc_call_done = nfs4_open_done,
+	.rpc_release = nfs4_open_release,
+};
+
+static int nfs4_run_open_task(struct nfs4_opendata *data,
+			      struct nfs_open_context *ctx)
+{
+	struct inode *dir = d_inode(data->dir);
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_openargs *o_arg = &data->o_arg;
+	struct nfs_openres *o_res = &data->o_res;
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN],
+		.rpc_argp = o_arg,
+		.rpc_resp = o_res,
+		.rpc_cred = data->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_open_ops,
+		.callback_data = data,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
+	};
+	int status;
+
+	if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
+		task_setup_data.flags |= RPC_TASK_MOVEABLE;
+
+	kref_get(&data->kref);
+	data->rpc_done = false;
+	data->rpc_status = 0;
+	data->cancelled = false;
+	data->is_recover = false;
+	if (!ctx) {
+		nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 1);
+		data->is_recover = true;
+		task_setup_data.flags |= RPC_TASK_TIMEOUT;
+	} else {
+		nfs4_init_sequence(&o_arg->seq_args, &o_res->seq_res, 1, 0);
+		pnfs_lgopen_prepare(data, ctx);
+	}
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = rpc_wait_for_completion_task(task);
+	if (status != 0) {
+		data->cancelled = true;
+		smp_wmb();
+	} else
+		status = data->rpc_status;
+	rpc_put_task(task);
+
+	return status;
+}
+
+static int _nfs4_recover_proc_open(struct nfs4_opendata *data)
+{
+	struct inode *dir = d_inode(data->dir);
+	struct nfs_openres *o_res = &data->o_res;
+	int status;
+
+	status = nfs4_run_open_task(data, NULL);
+	if (status != 0 || !data->rpc_done)
+		return status;
+
+	nfs_fattr_map_and_free_names(NFS_SERVER(dir), &data->f_attr);
+
+	if (o_res->rflags & NFS4_OPEN_RESULT_CONFIRM)
+		status = _nfs4_proc_open_confirm(data);
+
+	return status;
+}
+
+/*
+ * Additional permission checks in order to distinguish between an
+ * open for read, and an open for execute. This works around the
+ * fact that NFSv4 OPEN treats read and execute permissions as being
+ * the same.
+ * Note that in the non-execute case, we want to turn off permission
+ * checking if we just created a new file (POSIX open() semantics).
+ */
+static int nfs4_opendata_access(const struct cred *cred,
+				struct nfs4_opendata *opendata,
+				struct nfs4_state *state, fmode_t fmode)
+{
+	struct nfs_access_entry cache;
+	u32 mask, flags;
+
+	/* access call failed or for some reason the server doesn't
+	 * support any access modes -- defer access call until later */
+	if (opendata->o_res.access_supported == 0)
+		return 0;
+
+	mask = 0;
+	if (fmode & FMODE_EXEC) {
+		/* ONLY check for exec rights */
+		if (S_ISDIR(state->inode->i_mode))
+			mask = NFS4_ACCESS_LOOKUP;
+		else
+			mask = NFS4_ACCESS_EXECUTE;
+	} else if ((fmode & FMODE_READ) && !opendata->file_created)
+		mask = NFS4_ACCESS_READ;
+
+	nfs_access_set_mask(&cache, opendata->o_res.access_result);
+	nfs_access_add_cache(state->inode, &cache, cred);
+
+	flags = NFS4_ACCESS_READ | NFS4_ACCESS_EXECUTE | NFS4_ACCESS_LOOKUP;
+	if ((mask & ~cache.mask & flags) == 0)
+		return 0;
+
+	return -EACCES;
+}
+
+/*
+ * Note: On error, nfs4_proc_open will free the struct nfs4_opendata
+ */
+static int _nfs4_proc_open(struct nfs4_opendata *data,
+			   struct nfs_open_context *ctx)
+{
+	struct inode *dir = d_inode(data->dir);
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_openargs *o_arg = &data->o_arg;
+	struct nfs_openres *o_res = &data->o_res;
+	int status;
+
+	status = nfs4_run_open_task(data, ctx);
+	if (!data->rpc_done)
+		return status;
+	if (status != 0) {
+		if (status == -NFS4ERR_BADNAME &&
+				!(o_arg->open_flags & O_CREAT))
+			return -ENOENT;
+		return status;
+	}
+
+	nfs_fattr_map_and_free_names(server, &data->f_attr);
+
+	if (o_arg->open_flags & O_CREAT) {
+		if (o_arg->open_flags & O_EXCL)
+			data->file_created = true;
+		else if (o_res->cinfo.before != o_res->cinfo.after)
+			data->file_created = true;
+		if (data->file_created ||
+		    inode_peek_iversion_raw(dir) != o_res->cinfo.after)
+			nfs4_update_changeattr(dir, &o_res->cinfo,
+					o_res->f_attr->time_start,
+					NFS_INO_INVALID_DATA);
+	}
+	if ((o_res->rflags & NFS4_OPEN_RESULT_LOCKTYPE_POSIX) == 0)
+		server->caps &= ~NFS_CAP_POSIX_LOCK;
+	if(o_res->rflags & NFS4_OPEN_RESULT_CONFIRM) {
+		status = _nfs4_proc_open_confirm(data);
+		if (status != 0)
+			return status;
+	}
+	if (!(o_res->f_attr->valid & NFS_ATTR_FATTR)) {
+		struct nfs_fh *fh = &o_res->fh;
+
+		nfs4_sequence_free_slot(&o_res->seq_res);
+		if (o_arg->claim == NFS4_OPEN_CLAIM_FH)
+			fh = NFS_FH(d_inode(data->dentry));
+		nfs4_proc_getattr(server, fh, o_res->f_attr, NULL);
+	}
+	return 0;
+}
+
+/*
+ * OPEN_EXPIRED:
+ * 	reclaim state on the server after a network partition.
+ * 	Assumes caller holds the appropriate lock
+ */
+static int _nfs4_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs4_opendata *opendata;
+	int ret;
+
+	opendata = nfs4_open_recoverdata_alloc(ctx, state, NFS4_OPEN_CLAIM_FH);
+	if (IS_ERR(opendata))
+		return PTR_ERR(opendata);
+	/*
+	 * We're not recovering a delegation, so ask for no delegation.
+	 * Otherwise the recovery thread could deadlock with an outstanding
+	 * delegation return.
+	 */
+	opendata->o_arg.open_flags = O_DIRECT;
+	ret = nfs4_open_recover(opendata, state);
+	if (ret == -ESTALE)
+		d_drop(ctx->dentry);
+	nfs4_opendata_put(opendata);
+	return ret;
+}
+
+static int nfs4_do_open_expired(struct nfs_open_context *ctx, struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = _nfs4_open_expired(ctx, state);
+		trace_nfs4_open_expired(ctx, 0, err);
+		if (nfs4_clear_cap_atomic_open_v1(server, err, &exception))
+			continue;
+		switch (err) {
+		default:
+			goto out;
+		case -NFS4ERR_GRACE:
+		case -NFS4ERR_DELAY:
+			nfs4_handle_exception(server, err, &exception);
+			err = 0;
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static int nfs4_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	struct nfs_open_context *ctx;
+	int ret;
+
+	ctx = nfs4_state_find_open_context(state);
+	if (IS_ERR(ctx))
+		return -EAGAIN;
+	ret = nfs4_do_open_expired(ctx, state);
+	put_nfs_open_context(ctx);
+	return ret;
+}
+
+static void nfs_finish_clear_delegation_stateid(struct nfs4_state *state,
+		const nfs4_stateid *stateid)
+{
+	nfs_remove_bad_delegation(state->inode, stateid);
+	nfs_state_clear_delegation(state);
+}
+
+static void nfs40_clear_delegation_stateid(struct nfs4_state *state)
+{
+	if (rcu_access_pointer(NFS_I(state->inode)->delegation) != NULL)
+		nfs_finish_clear_delegation_stateid(state, NULL);
+}
+
+static int nfs40_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	/* NFSv4.0 doesn't allow for delegation recovery on open expire */
+	nfs40_clear_delegation_stateid(state);
+	nfs_state_clear_open_state_flags(state);
+	return nfs4_open_expired(sp, state);
+}
+
+static int nfs40_test_and_free_expired_stateid(struct nfs_server *server,
+		nfs4_stateid *stateid,
+		const struct cred *cred)
+{
+	return -NFS4ERR_BAD_STATEID;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+static int nfs41_test_and_free_expired_stateid(struct nfs_server *server,
+		nfs4_stateid *stateid,
+		const struct cred *cred)
+{
+	int status;
+
+	switch (stateid->type) {
+	default:
+		break;
+	case NFS4_INVALID_STATEID_TYPE:
+	case NFS4_SPECIAL_STATEID_TYPE:
+		return -NFS4ERR_BAD_STATEID;
+	case NFS4_REVOKED_STATEID_TYPE:
+		goto out_free;
+	}
+
+	status = nfs41_test_stateid(server, stateid, cred);
+	switch (status) {
+	case -NFS4ERR_EXPIRED:
+	case -NFS4ERR_ADMIN_REVOKED:
+	case -NFS4ERR_DELEG_REVOKED:
+		break;
+	default:
+		return status;
+	}
+out_free:
+	/* Ack the revoked state to the server */
+	nfs41_free_stateid(server, stateid, cred, true);
+	return -NFS4ERR_EXPIRED;
+}
+
+static int nfs41_check_delegation_stateid(struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	nfs4_stateid stateid;
+	struct nfs_delegation *delegation;
+	const struct cred *cred = NULL;
+	int status, ret = NFS_OK;
+
+	/* Get the delegation credential for use by test/free_stateid */
+	rcu_read_lock();
+	delegation = rcu_dereference(NFS_I(state->inode)->delegation);
+	if (delegation == NULL) {
+		rcu_read_unlock();
+		nfs_state_clear_delegation(state);
+		return NFS_OK;
+	}
+
+	spin_lock(&delegation->lock);
+	nfs4_stateid_copy(&stateid, &delegation->stateid);
+
+	if (!test_and_clear_bit(NFS_DELEGATION_TEST_EXPIRED,
+				&delegation->flags)) {
+		spin_unlock(&delegation->lock);
+		rcu_read_unlock();
+		return NFS_OK;
+	}
+
+	if (delegation->cred)
+		cred = get_cred(delegation->cred);
+	spin_unlock(&delegation->lock);
+	rcu_read_unlock();
+	status = nfs41_test_and_free_expired_stateid(server, &stateid, cred);
+	trace_nfs4_test_delegation_stateid(state, NULL, status);
+	if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID)
+		nfs_finish_clear_delegation_stateid(state, &stateid);
+	else
+		ret = status;
+
+	put_cred(cred);
+	return ret;
+}
+
+static void nfs41_delegation_recover_stateid(struct nfs4_state *state)
+{
+	nfs4_stateid tmp;
+
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags) &&
+	    nfs4_copy_delegation_stateid(state->inode, state->state,
+				&tmp, NULL) &&
+	    nfs4_stateid_match_other(&state->stateid, &tmp))
+		nfs_state_set_delegation(state, &tmp, state->state);
+	else
+		nfs_state_clear_delegation(state);
+}
+
+/**
+ * nfs41_check_expired_locks - possibly free a lock stateid
+ *
+ * @state: NFSv4 state for an inode
+ *
+ * Returns NFS_OK if recovery for this stateid is now finished.
+ * Otherwise a negative NFS4ERR value is returned.
+ */
+static int nfs41_check_expired_locks(struct nfs4_state *state)
+{
+	int status, ret = NFS_OK;
+	struct nfs4_lock_state *lsp, *prev = NULL;
+	struct nfs_server *server = NFS_SERVER(state->inode);
+
+	if (!test_bit(LK_STATE_IN_USE, &state->flags))
+		goto out;
+
+	spin_lock(&state->state_lock);
+	list_for_each_entry(lsp, &state->lock_states, ls_locks) {
+		if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags)) {
+			const struct cred *cred = lsp->ls_state->owner->so_cred;
+
+			refcount_inc(&lsp->ls_count);
+			spin_unlock(&state->state_lock);
+
+			nfs4_put_lock_state(prev);
+			prev = lsp;
+
+			status = nfs41_test_and_free_expired_stateid(server,
+					&lsp->ls_stateid,
+					cred);
+			trace_nfs4_test_lock_stateid(state, lsp, status);
+			if (status == -NFS4ERR_EXPIRED ||
+			    status == -NFS4ERR_BAD_STATEID) {
+				clear_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
+				lsp->ls_stateid.type = NFS4_INVALID_STATEID_TYPE;
+				if (!recover_lost_locks)
+					set_bit(NFS_LOCK_LOST, &lsp->ls_flags);
+			} else if (status != NFS_OK) {
+				ret = status;
+				nfs4_put_lock_state(prev);
+				goto out;
+			}
+			spin_lock(&state->state_lock);
+		}
+	}
+	spin_unlock(&state->state_lock);
+	nfs4_put_lock_state(prev);
+out:
+	return ret;
+}
+
+/**
+ * nfs41_check_open_stateid - possibly free an open stateid
+ *
+ * @state: NFSv4 state for an inode
+ *
+ * Returns NFS_OK if recovery for this stateid is now finished.
+ * Otherwise a negative NFS4ERR value is returned.
+ */
+static int nfs41_check_open_stateid(struct nfs4_state *state)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	nfs4_stateid *stateid = &state->open_stateid;
+	const struct cred *cred = state->owner->so_cred;
+	int status;
+
+	if (test_bit(NFS_OPEN_STATE, &state->flags) == 0)
+		return -NFS4ERR_BAD_STATEID;
+	status = nfs41_test_and_free_expired_stateid(server, stateid, cred);
+	trace_nfs4_test_open_stateid(state, NULL, status);
+	if (status == -NFS4ERR_EXPIRED || status == -NFS4ERR_BAD_STATEID) {
+		nfs_state_clear_open_state_flags(state);
+		stateid->type = NFS4_INVALID_STATEID_TYPE;
+		return status;
+	}
+	if (nfs_open_stateid_recover_openmode(state))
+		return -NFS4ERR_OPENMODE;
+	return NFS_OK;
+}
+
+static int nfs41_open_expired(struct nfs4_state_owner *sp, struct nfs4_state *state)
+{
+	int status;
+
+	status = nfs41_check_delegation_stateid(state);
+	if (status != NFS_OK)
+		return status;
+	nfs41_delegation_recover_stateid(state);
+
+	status = nfs41_check_expired_locks(state);
+	if (status != NFS_OK)
+		return status;
+	status = nfs41_check_open_stateid(state);
+	if (status != NFS_OK)
+		status = nfs4_open_expired(sp, state);
+	return status;
+}
+#endif
+
+/*
+ * on an EXCLUSIVE create, the server should send back a bitmask with FATTR4-*
+ * fields corresponding to attributes that were used to store the verifier.
+ * Make sure we clobber those fields in the later setattr call
+ */
+static unsigned nfs4_exclusive_attrset(struct nfs4_opendata *opendata,
+				struct iattr *sattr, struct nfs4_label **label)
+{
+	const __u32 *bitmask = opendata->o_arg.server->exclcreat_bitmask;
+	__u32 attrset[3];
+	unsigned ret;
+	unsigned i;
+
+	for (i = 0; i < ARRAY_SIZE(attrset); i++) {
+		attrset[i] = opendata->o_res.attrset[i];
+		if (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE4_1)
+			attrset[i] &= ~bitmask[i];
+	}
+
+	ret = (opendata->o_arg.createmode == NFS4_CREATE_EXCLUSIVE) ?
+		sattr->ia_valid : 0;
+
+	if ((attrset[1] & (FATTR4_WORD1_TIME_ACCESS|FATTR4_WORD1_TIME_ACCESS_SET))) {
+		if (sattr->ia_valid & ATTR_ATIME_SET)
+			ret |= ATTR_ATIME_SET;
+		else
+			ret |= ATTR_ATIME;
+	}
+
+	if ((attrset[1] & (FATTR4_WORD1_TIME_MODIFY|FATTR4_WORD1_TIME_MODIFY_SET))) {
+		if (sattr->ia_valid & ATTR_MTIME_SET)
+			ret |= ATTR_MTIME_SET;
+		else
+			ret |= ATTR_MTIME;
+	}
+
+	if (!(attrset[2] & FATTR4_WORD2_SECURITY_LABEL))
+		*label = NULL;
+	return ret;
+}
+
+static int _nfs4_open_and_get_state(struct nfs4_opendata *opendata,
+		struct nfs_open_context *ctx)
+{
+	struct nfs4_state_owner *sp = opendata->owner;
+	struct nfs_server *server = sp->so_server;
+	struct dentry *dentry;
+	struct nfs4_state *state;
+	fmode_t acc_mode = _nfs4_ctx_to_accessmode(ctx);
+	struct inode *dir = d_inode(opendata->dir);
+	unsigned long dir_verifier;
+	unsigned int seq;
+	int ret;
+
+	seq = raw_seqcount_begin(&sp->so_reclaim_seqcount);
+	dir_verifier = nfs_save_change_attribute(dir);
+
+	ret = _nfs4_proc_open(opendata, ctx);
+	if (ret != 0)
+		goto out;
+
+	state = _nfs4_opendata_to_nfs4_state(opendata);
+	ret = PTR_ERR(state);
+	if (IS_ERR(state))
+		goto out;
+	ctx->state = state;
+	if (server->caps & NFS_CAP_POSIX_LOCK)
+		set_bit(NFS_STATE_POSIX_LOCKS, &state->flags);
+	if (opendata->o_res.rflags & NFS4_OPEN_RESULT_MAY_NOTIFY_LOCK)
+		set_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags);
+	if (opendata->o_res.rflags & NFS4_OPEN_RESULT_PRESERVE_UNLINKED)
+		set_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(state->inode)->flags);
+
+	dentry = opendata->dentry;
+	if (d_really_is_negative(dentry)) {
+		struct dentry *alias;
+		d_drop(dentry);
+		alias = d_exact_alias(dentry, state->inode);
+		if (!alias)
+			alias = d_splice_alias(igrab(state->inode), dentry);
+		/* d_splice_alias() can't fail here - it's a non-directory */
+		if (alias) {
+			dput(ctx->dentry);
+			ctx->dentry = dentry = alias;
+		}
+	}
+
+	switch(opendata->o_arg.claim) {
+	default:
+		break;
+	case NFS4_OPEN_CLAIM_NULL:
+	case NFS4_OPEN_CLAIM_DELEGATE_CUR:
+	case NFS4_OPEN_CLAIM_DELEGATE_PREV:
+		if (!opendata->rpc_done)
+			break;
+		if (opendata->o_res.delegation_type != 0)
+			dir_verifier = nfs_save_change_attribute(dir);
+		nfs_set_verifier(dentry, dir_verifier);
+	}
+
+	/* Parse layoutget results before we check for access */
+	pnfs_parse_lgopen(state->inode, opendata->lgp, ctx);
+
+	ret = nfs4_opendata_access(sp->so_cred, opendata, state, acc_mode);
+	if (ret != 0)
+		goto out;
+
+	if (d_inode(dentry) == state->inode) {
+		nfs_inode_attach_open_context(ctx);
+		if (read_seqcount_retry(&sp->so_reclaim_seqcount, seq))
+			nfs4_schedule_stateid_recovery(server, state);
+	}
+
+out:
+	if (!opendata->cancelled) {
+		if (opendata->lgp) {
+			nfs4_lgopen_release(opendata->lgp);
+			opendata->lgp = NULL;
+		}
+		nfs4_sequence_free_slot(&opendata->o_res.seq_res);
+	}
+	return ret;
+}
+
+/*
+ * Returns a referenced nfs4_state
+ */
+static int _nfs4_do_open(struct inode *dir,
+			struct nfs_open_context *ctx,
+			int flags,
+			const struct nfs4_open_createattrs *c,
+			int *opened)
+{
+	struct nfs4_state_owner  *sp;
+	struct nfs4_state     *state = NULL;
+	struct nfs_server       *server = NFS_SERVER(dir);
+	struct nfs4_opendata *opendata;
+	struct dentry *dentry = ctx->dentry;
+	const struct cred *cred = ctx->cred;
+	struct nfs4_threshold **ctx_th = &ctx->mdsthreshold;
+	fmode_t fmode = _nfs4_ctx_to_openmode(ctx);
+	enum open_claim_type4 claim = NFS4_OPEN_CLAIM_NULL;
+	struct iattr *sattr = c->sattr;
+	struct nfs4_label *label = c->label;
+	int status;
+
+	/* Protect against reboot recovery conflicts */
+	status = -ENOMEM;
+	sp = nfs4_get_state_owner(server, cred, GFP_KERNEL);
+	if (sp == NULL) {
+		dprintk("nfs4_do_open: nfs4_get_state_owner failed!\n");
+		goto out_err;
+	}
+	status = nfs4_client_recover_expired_lease(server->nfs_client);
+	if (status != 0)
+		goto err_put_state_owner;
+	if (d_really_is_positive(dentry))
+		nfs4_return_incompatible_delegation(d_inode(dentry), fmode);
+	status = -ENOMEM;
+	if (d_really_is_positive(dentry))
+		claim = NFS4_OPEN_CLAIM_FH;
+	opendata = nfs4_opendata_alloc(dentry, sp, fmode, flags,
+			c, claim, GFP_KERNEL);
+	if (opendata == NULL)
+		goto err_put_state_owner;
+
+	if (server->attr_bitmask[2] & FATTR4_WORD2_MDSTHRESHOLD) {
+		if (!opendata->f_attr.mdsthreshold) {
+			opendata->f_attr.mdsthreshold = pnfs_mdsthreshold_alloc();
+			if (!opendata->f_attr.mdsthreshold)
+				goto err_opendata_put;
+		}
+		opendata->o_arg.open_bitmap = &nfs4_pnfs_open_bitmap[0];
+	}
+	if (d_really_is_positive(dentry))
+		opendata->state = nfs4_get_open_state(d_inode(dentry), sp);
+
+	status = _nfs4_open_and_get_state(opendata, ctx);
+	if (status != 0)
+		goto err_opendata_put;
+	state = ctx->state;
+
+	if ((opendata->o_arg.open_flags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL) &&
+	    (opendata->o_arg.createmode != NFS4_CREATE_GUARDED)) {
+		unsigned attrs = nfs4_exclusive_attrset(opendata, sattr, &label);
+		/*
+		 * send create attributes which was not set by open
+		 * with an extra setattr.
+		 */
+		if (attrs || label) {
+			unsigned ia_old = sattr->ia_valid;
+
+			sattr->ia_valid = attrs;
+			nfs_fattr_init(opendata->o_res.f_attr);
+			status = nfs4_do_setattr(state->inode, cred,
+					opendata->o_res.f_attr, sattr,
+					ctx, label);
+			if (status == 0) {
+				nfs_setattr_update_inode(state->inode, sattr,
+						opendata->o_res.f_attr);
+				nfs_setsecurity(state->inode, opendata->o_res.f_attr);
+			}
+			sattr->ia_valid = ia_old;
+		}
+	}
+	if (opened && opendata->file_created)
+		*opened = 1;
+
+	if (pnfs_use_threshold(ctx_th, opendata->f_attr.mdsthreshold, server)) {
+		*ctx_th = opendata->f_attr.mdsthreshold;
+		opendata->f_attr.mdsthreshold = NULL;
+	}
+
+	nfs4_opendata_put(opendata);
+	nfs4_put_state_owner(sp);
+	return 0;
+err_opendata_put:
+	nfs4_opendata_put(opendata);
+err_put_state_owner:
+	nfs4_put_state_owner(sp);
+out_err:
+	return status;
+}
+
+
+static struct nfs4_state *nfs4_do_open(struct inode *dir,
+					struct nfs_open_context *ctx,
+					int flags,
+					struct iattr *sattr,
+					struct nfs4_label *label,
+					int *opened)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	struct nfs4_state *res;
+	struct nfs4_open_createattrs c = {
+		.label = label,
+		.sattr = sattr,
+		.verf = {
+			[0] = (__u32)jiffies,
+			[1] = (__u32)current->pid,
+		},
+	};
+	int status;
+
+	do {
+		status = _nfs4_do_open(dir, ctx, flags, &c, opened);
+		res = ctx->state;
+		trace_nfs4_open_file(ctx, flags, status);
+		if (status == 0)
+			break;
+		/* NOTE: BAD_SEQID means the server and client disagree about the
+		 * book-keeping w.r.t. state-changing operations
+		 * (OPEN/CLOSE/LOCK/LOCKU...)
+		 * It is actually a sign of a bug on the client or on the server.
+		 *
+		 * If we receive a BAD_SEQID error in the particular case of
+		 * doing an OPEN, we assume that nfs_increment_open_seqid() will
+		 * have unhashed the old state_owner for us, and that we can
+		 * therefore safely retry using a new one. We should still warn
+		 * the user though...
+		 */
+		if (status == -NFS4ERR_BAD_SEQID) {
+			pr_warn_ratelimited("NFS: v4 server %s "
+					" returned a bad sequence-id error!\n",
+					NFS_SERVER(dir)->nfs_client->cl_hostname);
+			exception.retry = 1;
+			continue;
+		}
+		/*
+		 * BAD_STATEID on OPEN means that the server cancelled our
+		 * state before it received the OPEN_CONFIRM.
+		 * Recover by retrying the request as per the discussion
+		 * on Page 181 of RFC3530.
+		 */
+		if (status == -NFS4ERR_BAD_STATEID) {
+			exception.retry = 1;
+			continue;
+		}
+		if (status == -NFS4ERR_EXPIRED) {
+			nfs4_schedule_lease_recovery(server->nfs_client);
+			exception.retry = 1;
+			continue;
+		}
+		if (status == -EAGAIN) {
+			/* We must have found a delegation */
+			exception.retry = 1;
+			continue;
+		}
+		if (nfs4_clear_cap_atomic_open_v1(server, status, &exception))
+			continue;
+		res = ERR_PTR(nfs4_handle_exception(server,
+					status, &exception));
+	} while (exception.retry);
+	return res;
+}
+
+static int _nfs4_do_setattr(struct inode *inode,
+			    struct nfs_setattrargs *arg,
+			    struct nfs_setattrres *res,
+			    const struct cred *cred,
+			    struct nfs_open_context *ctx)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
+		.rpc_argp	= arg,
+		.rpc_resp	= res,
+		.rpc_cred	= cred,
+	};
+	const struct cred *delegation_cred = NULL;
+	unsigned long timestamp = jiffies;
+	bool truncate;
+	int status;
+
+	nfs_fattr_init(res->fattr);
+
+	/* Servers should only apply open mode checks for file size changes */
+	truncate = (arg->iap->ia_valid & ATTR_SIZE) ? true : false;
+	if (!truncate) {
+		nfs4_inode_make_writeable(inode);
+		goto zero_stateid;
+	}
+
+	if (nfs4_copy_delegation_stateid(inode, FMODE_WRITE, &arg->stateid, &delegation_cred)) {
+		/* Use that stateid */
+	} else if (ctx != NULL && ctx->state) {
+		struct nfs_lock_context *l_ctx;
+		if (!nfs4_valid_open_stateid(ctx->state))
+			return -EBADF;
+		l_ctx = nfs_get_lock_context(ctx);
+		if (IS_ERR(l_ctx))
+			return PTR_ERR(l_ctx);
+		status = nfs4_select_rw_stateid(ctx->state, FMODE_WRITE, l_ctx,
+						&arg->stateid, &delegation_cred);
+		nfs_put_lock_context(l_ctx);
+		if (status == -EIO)
+			return -EBADF;
+		else if (status == -EAGAIN)
+			goto zero_stateid;
+	} else {
+zero_stateid:
+		nfs4_stateid_copy(&arg->stateid, &zero_stateid);
+	}
+	if (delegation_cred)
+		msg.rpc_cred = delegation_cred;
+
+	status = nfs4_call_sync(server->client, server, &msg, &arg->seq_args, &res->seq_res, 1);
+
+	put_cred(delegation_cred);
+	if (status == 0 && ctx != NULL)
+		renew_lease(server, timestamp);
+	trace_nfs4_setattr(inode, &arg->stateid, status);
+	return status;
+}
+
+static int nfs4_do_setattr(struct inode *inode, const struct cred *cred,
+			   struct nfs_fattr *fattr, struct iattr *sattr,
+			   struct nfs_open_context *ctx, struct nfs4_label *ilabel)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	__u32 bitmask[NFS4_BITMASK_SZ];
+	struct nfs4_state *state = ctx ? ctx->state : NULL;
+	struct nfs_setattrargs	arg = {
+		.fh		= NFS_FH(inode),
+		.iap		= sattr,
+		.server		= server,
+		.bitmask = bitmask,
+		.label		= ilabel,
+	};
+	struct nfs_setattrres  res = {
+		.fattr		= fattr,
+		.server		= server,
+	};
+	struct nfs4_exception exception = {
+		.state = state,
+		.inode = inode,
+		.stateid = &arg.stateid,
+	};
+	unsigned long adjust_flags = NFS_INO_INVALID_CHANGE;
+	int err;
+
+	if (sattr->ia_valid & (ATTR_MODE | ATTR_KILL_SUID | ATTR_KILL_SGID))
+		adjust_flags |= NFS_INO_INVALID_MODE;
+	if (sattr->ia_valid & (ATTR_UID | ATTR_GID))
+		adjust_flags |= NFS_INO_INVALID_OTHER;
+
+	do {
+		nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label),
+					inode, adjust_flags);
+
+		err = _nfs4_do_setattr(inode, &arg, &res, cred, ctx);
+		switch (err) {
+		case -NFS4ERR_OPENMODE:
+			if (!(sattr->ia_valid & ATTR_SIZE)) {
+				pr_warn_once("NFSv4: server %s is incorrectly "
+						"applying open mode checks to "
+						"a SETATTR that is not "
+						"changing file size.\n",
+						server->nfs_client->cl_hostname);
+			}
+			if (state && !(state->state & FMODE_WRITE)) {
+				err = -EBADF;
+				if (sattr->ia_valid & ATTR_OPEN)
+					err = -EACCES;
+				goto out;
+			}
+		}
+		err = nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static bool
+nfs4_wait_on_layoutreturn(struct inode *inode, struct rpc_task *task)
+{
+	if (inode == NULL || !nfs_have_layout(inode))
+		return false;
+
+	return pnfs_wait_on_layoutreturn(inode, task);
+}
+
+/*
+ * Update the seqid of an open stateid
+ */
+static void nfs4_sync_open_stateid(nfs4_stateid *dst,
+		struct nfs4_state *state)
+{
+	__be32 seqid_open;
+	u32 dst_seqid;
+	int seq;
+
+	for (;;) {
+		if (!nfs4_valid_open_stateid(state))
+			break;
+		seq = read_seqbegin(&state->seqlock);
+		if (!nfs4_state_match_open_stateid_other(state, dst)) {
+			nfs4_stateid_copy(dst, &state->open_stateid);
+			if (read_seqretry(&state->seqlock, seq))
+				continue;
+			break;
+		}
+		seqid_open = state->open_stateid.seqid;
+		if (read_seqretry(&state->seqlock, seq))
+			continue;
+
+		dst_seqid = be32_to_cpu(dst->seqid);
+		if ((s32)(dst_seqid - be32_to_cpu(seqid_open)) < 0)
+			dst->seqid = seqid_open;
+		break;
+	}
+}
+
+/*
+ * Update the seqid of an open stateid after receiving
+ * NFS4ERR_OLD_STATEID
+ */
+static bool nfs4_refresh_open_old_stateid(nfs4_stateid *dst,
+		struct nfs4_state *state)
+{
+	__be32 seqid_open;
+	u32 dst_seqid;
+	bool ret;
+	int seq, status = -EAGAIN;
+	DEFINE_WAIT(wait);
+
+	for (;;) {
+		ret = false;
+		if (!nfs4_valid_open_stateid(state))
+			break;
+		seq = read_seqbegin(&state->seqlock);
+		if (!nfs4_state_match_open_stateid_other(state, dst)) {
+			if (read_seqretry(&state->seqlock, seq))
+				continue;
+			break;
+		}
+
+		write_seqlock(&state->seqlock);
+		seqid_open = state->open_stateid.seqid;
+
+		dst_seqid = be32_to_cpu(dst->seqid);
+
+		/* Did another OPEN bump the state's seqid?  try again: */
+		if ((s32)(be32_to_cpu(seqid_open) - dst_seqid) > 0) {
+			dst->seqid = seqid_open;
+			write_sequnlock(&state->seqlock);
+			ret = true;
+			break;
+		}
+
+		/* server says we're behind but we haven't seen the update yet */
+		set_bit(NFS_STATE_CHANGE_WAIT, &state->flags);
+		prepare_to_wait(&state->waitq, &wait, TASK_KILLABLE);
+		write_sequnlock(&state->seqlock);
+		trace_nfs4_close_stateid_update_wait(state->inode, dst, 0);
+
+		if (fatal_signal_pending(current))
+			status = -EINTR;
+		else
+			if (schedule_timeout(5*HZ) != 0)
+				status = 0;
+
+		finish_wait(&state->waitq, &wait);
+
+		if (!status)
+			continue;
+		if (status == -EINTR)
+			break;
+
+		/* we slept the whole 5 seconds, we must have lost a seqid */
+		dst->seqid = cpu_to_be32(dst_seqid + 1);
+		ret = true;
+		break;
+	}
+
+	return ret;
+}
+
+struct nfs4_closedata {
+	struct inode *inode;
+	struct nfs4_state *state;
+	struct nfs_closeargs arg;
+	struct nfs_closeres res;
+	struct {
+		struct nfs4_layoutreturn_args arg;
+		struct nfs4_layoutreturn_res res;
+		struct nfs4_xdr_opaque_data ld_private;
+		u32 roc_barrier;
+		bool roc;
+	} lr;
+	struct nfs_fattr fattr;
+	unsigned long timestamp;
+};
+
+static void nfs4_free_closedata(void *data)
+{
+	struct nfs4_closedata *calldata = data;
+	struct nfs4_state_owner *sp = calldata->state->owner;
+	struct super_block *sb = calldata->state->inode->i_sb;
+
+	if (calldata->lr.roc)
+		pnfs_roc_release(&calldata->lr.arg, &calldata->lr.res,
+				calldata->res.lr_ret);
+	nfs4_put_open_state(calldata->state);
+	nfs_free_seqid(calldata->arg.seqid);
+	nfs4_put_state_owner(sp);
+	nfs_sb_deactive(sb);
+	kfree(calldata);
+}
+
+static void nfs4_close_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_closedata *calldata = data;
+	struct nfs4_state *state = calldata->state;
+	struct nfs_server *server = NFS_SERVER(calldata->inode);
+	nfs4_stateid *res_stateid = NULL;
+	struct nfs4_exception exception = {
+		.state = state,
+		.inode = calldata->inode,
+		.stateid = &calldata->arg.stateid,
+	};
+
+	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
+		return;
+	trace_nfs4_close(state, &calldata->arg, &calldata->res, task->tk_status);
+
+	/* Handle Layoutreturn errors */
+	if (pnfs_roc_done(task, &calldata->arg.lr_args, &calldata->res.lr_res,
+			  &calldata->res.lr_ret) == -EAGAIN)
+		goto out_restart;
+
+	/* hmm. we are done with the inode, and in the process of freeing
+	 * the state_owner. we keep this around to process errors
+	 */
+	switch (task->tk_status) {
+		case 0:
+			res_stateid = &calldata->res.stateid;
+			renew_lease(server, calldata->timestamp);
+			break;
+		case -NFS4ERR_ACCESS:
+			if (calldata->arg.bitmask != NULL) {
+				calldata->arg.bitmask = NULL;
+				calldata->res.fattr = NULL;
+				goto out_restart;
+
+			}
+			break;
+		case -NFS4ERR_OLD_STATEID:
+			/* Did we race with OPEN? */
+			if (nfs4_refresh_open_old_stateid(&calldata->arg.stateid,
+						state))
+				goto out_restart;
+			goto out_release;
+		case -NFS4ERR_ADMIN_REVOKED:
+		case -NFS4ERR_STALE_STATEID:
+		case -NFS4ERR_EXPIRED:
+			nfs4_free_revoked_stateid(server,
+					&calldata->arg.stateid,
+					task->tk_msg.rpc_cred);
+			fallthrough;
+		case -NFS4ERR_BAD_STATEID:
+			if (calldata->arg.fmode == 0)
+				break;
+			fallthrough;
+		default:
+			task->tk_status = nfs4_async_handle_exception(task,
+					server, task->tk_status, &exception);
+			if (exception.retry)
+				goto out_restart;
+	}
+	nfs_clear_open_stateid(state, &calldata->arg.stateid,
+			res_stateid, calldata->arg.fmode);
+out_release:
+	task->tk_status = 0;
+	nfs_release_seqid(calldata->arg.seqid);
+	nfs_refresh_inode(calldata->inode, &calldata->fattr);
+	dprintk("%s: ret = %d\n", __func__, task->tk_status);
+	return;
+out_restart:
+	task->tk_status = 0;
+	rpc_restart_call_prepare(task);
+	goto out_release;
+}
+
+static void nfs4_close_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_closedata *calldata = data;
+	struct nfs4_state *state = calldata->state;
+	struct inode *inode = calldata->inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct pnfs_layout_hdr *lo;
+	bool is_rdonly, is_wronly, is_rdwr;
+	int call_close = 0;
+
+	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
+		goto out_wait;
+
+	task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_OPEN_DOWNGRADE];
+	spin_lock(&state->owner->so_lock);
+	is_rdwr = test_bit(NFS_O_RDWR_STATE, &state->flags);
+	is_rdonly = test_bit(NFS_O_RDONLY_STATE, &state->flags);
+	is_wronly = test_bit(NFS_O_WRONLY_STATE, &state->flags);
+	/* Calculate the change in open mode */
+	calldata->arg.fmode = 0;
+	if (state->n_rdwr == 0) {
+		if (state->n_rdonly == 0)
+			call_close |= is_rdonly;
+		else if (is_rdonly)
+			calldata->arg.fmode |= FMODE_READ;
+		if (state->n_wronly == 0)
+			call_close |= is_wronly;
+		else if (is_wronly)
+			calldata->arg.fmode |= FMODE_WRITE;
+		if (calldata->arg.fmode != (FMODE_READ|FMODE_WRITE))
+			call_close |= is_rdwr;
+	} else if (is_rdwr)
+		calldata->arg.fmode |= FMODE_READ|FMODE_WRITE;
+
+	nfs4_sync_open_stateid(&calldata->arg.stateid, state);
+	if (!nfs4_valid_open_stateid(state))
+		call_close = 0;
+	spin_unlock(&state->owner->so_lock);
+
+	if (!call_close) {
+		/* Note: exit _without_ calling nfs4_close_done */
+		goto out_no_action;
+	}
+
+	if (!calldata->lr.roc && nfs4_wait_on_layoutreturn(inode, task)) {
+		nfs_release_seqid(calldata->arg.seqid);
+		goto out_wait;
+	}
+
+	lo = calldata->arg.lr_args ? calldata->arg.lr_args->layout : NULL;
+	if (lo && !pnfs_layout_is_valid(lo)) {
+		calldata->arg.lr_args = NULL;
+		calldata->res.lr_res = NULL;
+	}
+
+	if (calldata->arg.fmode == 0)
+		task->tk_msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE];
+
+	if (calldata->arg.fmode == 0 || calldata->arg.fmode == FMODE_READ) {
+		/* Close-to-open cache consistency revalidation */
+		if (!nfs4_have_delegation(inode, FMODE_READ)) {
+			nfs4_bitmask_set(calldata->arg.bitmask_store,
+					 server->cache_consistency_bitmask,
+					 inode, 0);
+			calldata->arg.bitmask = calldata->arg.bitmask_store;
+		} else
+			calldata->arg.bitmask = NULL;
+	}
+
+	calldata->arg.share_access =
+		nfs4_map_atomic_open_share(NFS_SERVER(inode),
+				calldata->arg.fmode, 0);
+
+	if (calldata->res.fattr == NULL)
+		calldata->arg.bitmask = NULL;
+	else if (calldata->arg.bitmask == NULL)
+		calldata->res.fattr = NULL;
+	calldata->timestamp = jiffies;
+	if (nfs4_setup_sequence(NFS_SERVER(inode)->nfs_client,
+				&calldata->arg.seq_args,
+				&calldata->res.seq_res,
+				task) != 0)
+		nfs_release_seqid(calldata->arg.seqid);
+	return;
+out_no_action:
+	task->tk_action = NULL;
+out_wait:
+	nfs4_sequence_done(task, &calldata->res.seq_res);
+}
+
+static const struct rpc_call_ops nfs4_close_ops = {
+	.rpc_call_prepare = nfs4_close_prepare,
+	.rpc_call_done = nfs4_close_done,
+	.rpc_release = nfs4_free_closedata,
+};
+
+/* 
+ * It is possible for data to be read/written from a mem-mapped file 
+ * after the sys_close call (which hits the vfs layer as a flush).
+ * This means that we can't safely call nfsv4 close on a file until 
+ * the inode is cleared. This in turn means that we are not good
+ * NFSv4 citizens - we do not indicate to the server to update the file's 
+ * share state even when we are done with one of the three share 
+ * stateid's in the inode.
+ *
+ * NOTE: Caller must be holding the sp->so_owner semaphore!
+ */
+int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
+	struct nfs4_closedata *calldata;
+	struct nfs4_state_owner *sp = state->owner;
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CLOSE],
+		.rpc_cred = state->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_close_ops,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
+	};
+	int status = -ENOMEM;
+
+	if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
+		task_setup_data.flags |= RPC_TASK_MOVEABLE;
+
+	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_CLEANUP,
+		&task_setup_data.rpc_client, &msg);
+
+	calldata = kzalloc(sizeof(*calldata), gfp_mask);
+	if (calldata == NULL)
+		goto out;
+	nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 1, 0);
+	calldata->inode = state->inode;
+	calldata->state = state;
+	calldata->arg.fh = NFS_FH(state->inode);
+	if (!nfs4_copy_open_stateid(&calldata->arg.stateid, state))
+		goto out_free_calldata;
+	/* Serialization for the sequence id */
+	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
+	calldata->arg.seqid = alloc_seqid(&state->owner->so_seqid, gfp_mask);
+	if (IS_ERR(calldata->arg.seqid))
+		goto out_free_calldata;
+	nfs_fattr_init(&calldata->fattr);
+	calldata->arg.fmode = 0;
+	calldata->lr.arg.ld_private = &calldata->lr.ld_private;
+	calldata->res.fattr = &calldata->fattr;
+	calldata->res.seqid = calldata->arg.seqid;
+	calldata->res.server = server;
+	calldata->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
+	calldata->lr.roc = pnfs_roc(state->inode,
+			&calldata->lr.arg, &calldata->lr.res, msg.rpc_cred);
+	if (calldata->lr.roc) {
+		calldata->arg.lr_args = &calldata->lr.arg;
+		calldata->res.lr_res = &calldata->lr.res;
+	}
+	nfs_sb_active(calldata->inode->i_sb);
+
+	msg.rpc_argp = &calldata->arg;
+	msg.rpc_resp = &calldata->res;
+	task_setup_data.callback_data = calldata;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	status = 0;
+	if (wait)
+		status = rpc_wait_for_completion_task(task);
+	rpc_put_task(task);
+	return status;
+out_free_calldata:
+	kfree(calldata);
+out:
+	nfs4_put_open_state(state);
+	nfs4_put_state_owner(sp);
+	return status;
+}
+
+static struct inode *
+nfs4_atomic_open(struct inode *dir, struct nfs_open_context *ctx,
+		int open_flags, struct iattr *attr, int *opened)
+{
+	struct nfs4_state *state;
+	struct nfs4_label l, *label;
+
+	label = nfs4_label_init_security(dir, ctx->dentry, attr, &l);
+
+	/* Protect against concurrent sillydeletes */
+	state = nfs4_do_open(dir, ctx, open_flags, attr, label, opened);
+
+	nfs4_label_release_security(label);
+
+	if (IS_ERR(state))
+		return ERR_CAST(state);
+	return state->inode;
+}
+
+static void nfs4_close_context(struct nfs_open_context *ctx, int is_sync)
+{
+	if (ctx->state == NULL)
+		return;
+	if (is_sync)
+		nfs4_close_sync(ctx->state, _nfs4_ctx_to_openmode(ctx));
+	else
+		nfs4_close_state(ctx->state, _nfs4_ctx_to_openmode(ctx));
+}
+
+#define FATTR4_WORD1_NFS40_MASK (2*FATTR4_WORD1_MOUNTED_ON_FILEID - 1UL)
+#define FATTR4_WORD2_NFS41_MASK (2*FATTR4_WORD2_SUPPATTR_EXCLCREAT - 1UL)
+#define FATTR4_WORD2_NFS42_MASK (2*FATTR4_WORD2_XATTR_SUPPORT - 1UL)
+
+static int _nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
+{
+	u32 bitmask[3] = {}, minorversion = server->nfs_client->cl_minorversion;
+	struct nfs4_server_caps_arg args = {
+		.fhandle = fhandle,
+		.bitmask = bitmask,
+	};
+	struct nfs4_server_caps_res res = {};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SERVER_CAPS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status;
+	int i;
+
+	bitmask[0] = FATTR4_WORD0_SUPPORTED_ATTRS |
+		     FATTR4_WORD0_FH_EXPIRE_TYPE |
+		     FATTR4_WORD0_LINK_SUPPORT |
+		     FATTR4_WORD0_SYMLINK_SUPPORT |
+		     FATTR4_WORD0_ACLSUPPORT |
+		     FATTR4_WORD0_CASE_INSENSITIVE |
+		     FATTR4_WORD0_CASE_PRESERVING;
+	if (minorversion)
+		bitmask[2] = FATTR4_WORD2_SUPPATTR_EXCLCREAT;
+
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	if (status == 0) {
+		/* Sanity check the server answers */
+		switch (minorversion) {
+		case 0:
+			res.attr_bitmask[1] &= FATTR4_WORD1_NFS40_MASK;
+			res.attr_bitmask[2] = 0;
+			break;
+		case 1:
+			res.attr_bitmask[2] &= FATTR4_WORD2_NFS41_MASK;
+			break;
+		case 2:
+			res.attr_bitmask[2] &= FATTR4_WORD2_NFS42_MASK;
+		}
+		memcpy(server->attr_bitmask, res.attr_bitmask, sizeof(server->attr_bitmask));
+		server->caps &= ~(NFS_CAP_ACLS | NFS_CAP_HARDLINKS |
+				  NFS_CAP_SYMLINKS| NFS_CAP_SECURITY_LABEL);
+		server->fattr_valid = NFS_ATTR_FATTR_V4;
+		if (res.attr_bitmask[0] & FATTR4_WORD0_ACL &&
+				res.acl_bitmask & ACL4_SUPPORT_ALLOW_ACL)
+			server->caps |= NFS_CAP_ACLS;
+		if (res.has_links != 0)
+			server->caps |= NFS_CAP_HARDLINKS;
+		if (res.has_symlinks != 0)
+			server->caps |= NFS_CAP_SYMLINKS;
+		if (res.case_insensitive)
+			server->caps |= NFS_CAP_CASE_INSENSITIVE;
+		if (res.case_preserving)
+			server->caps |= NFS_CAP_CASE_PRESERVING;
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+		if (res.attr_bitmask[2] & FATTR4_WORD2_SECURITY_LABEL)
+			server->caps |= NFS_CAP_SECURITY_LABEL;
+#endif
+		if (res.attr_bitmask[0] & FATTR4_WORD0_FS_LOCATIONS)
+			server->caps |= NFS_CAP_FS_LOCATIONS;
+		if (!(res.attr_bitmask[0] & FATTR4_WORD0_FILEID))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_FILEID;
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_MODE))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_MODE;
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_NUMLINKS))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_NLINK;
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER))
+			server->fattr_valid &= ~(NFS_ATTR_FATTR_OWNER |
+				NFS_ATTR_FATTR_OWNER_NAME);
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_OWNER_GROUP))
+			server->fattr_valid &= ~(NFS_ATTR_FATTR_GROUP |
+				NFS_ATTR_FATTR_GROUP_NAME);
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_SPACE_USED))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_SPACE_USED;
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_ACCESS))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_ATIME;
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_METADATA))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_CTIME;
+		if (!(res.attr_bitmask[1] & FATTR4_WORD1_TIME_MODIFY))
+			server->fattr_valid &= ~NFS_ATTR_FATTR_MTIME;
+		memcpy(server->attr_bitmask_nl, res.attr_bitmask,
+				sizeof(server->attr_bitmask));
+		server->attr_bitmask_nl[2] &= ~FATTR4_WORD2_SECURITY_LABEL;
+
+		memcpy(server->cache_consistency_bitmask, res.attr_bitmask, sizeof(server->cache_consistency_bitmask));
+		server->cache_consistency_bitmask[0] &= FATTR4_WORD0_CHANGE|FATTR4_WORD0_SIZE;
+		server->cache_consistency_bitmask[1] &= FATTR4_WORD1_TIME_METADATA|FATTR4_WORD1_TIME_MODIFY;
+		server->cache_consistency_bitmask[2] = 0;
+
+		/* Avoid a regression due to buggy server */
+		for (i = 0; i < ARRAY_SIZE(res.exclcreat_bitmask); i++)
+			res.exclcreat_bitmask[i] &= res.attr_bitmask[i];
+		memcpy(server->exclcreat_bitmask, res.exclcreat_bitmask,
+			sizeof(server->exclcreat_bitmask));
+
+		server->acl_bitmask = res.acl_bitmask;
+		server->fh_expire_type = res.fh_expire_type;
+	}
+
+	return status;
+}
+
+int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+
+	nfs4_server_set_init_caps(server);
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_server_capabilities(server, fhandle),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static void test_fs_location_for_trunking(struct nfs4_fs_location *location,
+					  struct nfs_client *clp,
+					  struct nfs_server *server)
+{
+	int i;
+
+	for (i = 0; i < location->nservers; i++) {
+		struct nfs4_string *srv_loc = &location->servers[i];
+		struct sockaddr_storage addr;
+		size_t addrlen;
+		struct xprt_create xprt_args = {
+			.ident = 0,
+			.net = clp->cl_net,
+		};
+		struct nfs4_add_xprt_data xprtdata = {
+			.clp = clp,
+		};
+		struct rpc_add_xprt_test rpcdata = {
+			.add_xprt_test = clp->cl_mvops->session_trunk,
+			.data = &xprtdata,
+		};
+		char *servername = NULL;
+
+		if (!srv_loc->len)
+			continue;
+
+		addrlen = nfs_parse_server_name(srv_loc->data, srv_loc->len,
+						&addr, sizeof(addr),
+						clp->cl_net, server->port);
+		if (!addrlen)
+			return;
+		xprt_args.dstaddr = (struct sockaddr *)&addr;
+		xprt_args.addrlen = addrlen;
+		servername = kmalloc(srv_loc->len + 1, GFP_KERNEL);
+		if (!servername)
+			return;
+		memcpy(servername, srv_loc->data, srv_loc->len);
+		servername[srv_loc->len] = '\0';
+		xprt_args.servername = servername;
+
+		xprtdata.cred = nfs4_get_clid_cred(clp);
+		rpc_clnt_add_xprt(clp->cl_rpcclient, &xprt_args,
+				  rpc_clnt_setup_test_and_add_xprt,
+				  &rpcdata);
+		if (xprtdata.cred)
+			put_cred(xprtdata.cred);
+		kfree(servername);
+	}
+}
+
+static int _nfs4_discover_trunking(struct nfs_server *server,
+				   struct nfs_fh *fhandle)
+{
+	struct nfs4_fs_locations *locations = NULL;
+	struct page *page;
+	const struct cred *cred;
+	struct nfs_client *clp = server->nfs_client;
+	const struct nfs4_state_maintenance_ops *ops =
+		clp->cl_mvops->state_renewal_ops;
+	int status = -ENOMEM, i;
+
+	cred = ops->get_state_renewal_cred(clp);
+	if (cred == NULL) {
+		cred = nfs4_get_clid_cred(clp);
+		if (cred == NULL)
+			return -ENOKEY;
+	}
+
+	page = alloc_page(GFP_KERNEL);
+	if (!page)
+		goto out_put_cred;
+	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
+	if (!locations)
+		goto out_free;
+	locations->fattr = nfs_alloc_fattr();
+	if (!locations->fattr)
+		goto out_free_2;
+
+	status = nfs4_proc_get_locations(server, fhandle, locations, page,
+					 cred);
+	if (status)
+		goto out_free_3;
+
+	for (i = 0; i < locations->nlocations; i++)
+		test_fs_location_for_trunking(&locations->locations[i], clp,
+					      server);
+out_free_3:
+	kfree(locations->fattr);
+out_free_2:
+	kfree(locations);
+out_free:
+	__free_page(page);
+out_put_cred:
+	put_cred(cred);
+	return status;
+}
+
+static int nfs4_discover_trunking(struct nfs_server *server,
+				  struct nfs_fh *fhandle)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	struct nfs_client *clp = server->nfs_client;
+	int err = 0;
+
+	if (!nfs4_has_session(clp))
+		goto out;
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_discover_trunking(server, fhandle),
+				&exception);
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_fsinfo *info)
+{
+	u32 bitmask[3];
+	struct nfs4_lookup_root_arg args = {
+		.bitmask = bitmask,
+	};
+	struct nfs4_lookup_res res = {
+		.server = server,
+		.fattr = info->fattr,
+		.fh = fhandle,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP_ROOT],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	bitmask[0] = nfs4_fattr_bitmap[0];
+	bitmask[1] = nfs4_fattr_bitmap[1];
+	/*
+	 * Process the label in the upcoming getfattr
+	 */
+	bitmask[2] = nfs4_fattr_bitmap[2] & ~FATTR4_WORD2_SECURITY_LABEL;
+
+	nfs_fattr_init(info->fattr);
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_fsinfo *info)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs4_lookup_root(server, fhandle, info);
+		trace_nfs4_lookup_root(server, fhandle, info->fattr, err);
+		switch (err) {
+		case 0:
+		case -NFS4ERR_WRONGSEC:
+			goto out;
+		default:
+			err = nfs4_handle_exception(server, err, &exception);
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static int nfs4_lookup_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
+				struct nfs_fsinfo *info, rpc_authflavor_t flavor)
+{
+	struct rpc_auth_create_args auth_args = {
+		.pseudoflavor = flavor,
+	};
+	struct rpc_auth *auth;
+
+	auth = rpcauth_create(&auth_args, server->client);
+	if (IS_ERR(auth))
+		return -EACCES;
+	return nfs4_lookup_root(server, fhandle, info);
+}
+
+/*
+ * Retry pseudoroot lookup with various security flavors.  We do this when:
+ *
+ *   NFSv4.0: the PUTROOTFH operation returns NFS4ERR_WRONGSEC
+ *   NFSv4.1: the server does not support the SECINFO_NO_NAME operation
+ *
+ * Returns zero on success, or a negative NFS4ERR value, or a
+ * negative errno value.
+ */
+static int nfs4_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
+			      struct nfs_fsinfo *info)
+{
+	/* Per 3530bis 15.33.5 */
+	static const rpc_authflavor_t flav_array[] = {
+		RPC_AUTH_GSS_KRB5P,
+		RPC_AUTH_GSS_KRB5I,
+		RPC_AUTH_GSS_KRB5,
+		RPC_AUTH_UNIX,			/* courtesy */
+		RPC_AUTH_NULL,
+	};
+	int status = -EPERM;
+	size_t i;
+
+	if (server->auth_info.flavor_len > 0) {
+		/* try each flavor specified by user */
+		for (i = 0; i < server->auth_info.flavor_len; i++) {
+			status = nfs4_lookup_root_sec(server, fhandle, info,
+						server->auth_info.flavors[i]);
+			if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
+				continue;
+			break;
+		}
+	} else {
+		/* no flavors specified by user, try default list */
+		for (i = 0; i < ARRAY_SIZE(flav_array); i++) {
+			status = nfs4_lookup_root_sec(server, fhandle, info,
+						      flav_array[i]);
+			if (status == -NFS4ERR_WRONGSEC || status == -EACCES)
+				continue;
+			break;
+		}
+	}
+
+	/*
+	 * -EACCES could mean that the user doesn't have correct permissions
+	 * to access the mount.  It could also mean that we tried to mount
+	 * with a gss auth flavor, but rpc.gssd isn't running.  Either way,
+	 * existing mount programs don't handle -EACCES very well so it should
+	 * be mapped to -EPERM instead.
+	 */
+	if (status == -EACCES)
+		status = -EPERM;
+	return status;
+}
+
+/**
+ * nfs4_proc_get_rootfh - get file handle for server's pseudoroot
+ * @server: initialized nfs_server handle
+ * @fhandle: we fill in the pseudo-fs root file handle
+ * @info: we fill in an FSINFO struct
+ * @auth_probe: probe the auth flavours
+ *
+ * Returns zero on success, or a negative errno.
+ */
+int nfs4_proc_get_rootfh(struct nfs_server *server, struct nfs_fh *fhandle,
+			 struct nfs_fsinfo *info,
+			 bool auth_probe)
+{
+	int status = 0;
+
+	if (!auth_probe)
+		status = nfs4_lookup_root(server, fhandle, info);
+
+	if (auth_probe || status == NFS4ERR_WRONGSEC)
+		status = server->nfs_client->cl_mvops->find_root_sec(server,
+				fhandle, info);
+
+	if (status == 0)
+		status = nfs4_server_capabilities(server, fhandle);
+	if (status == 0)
+		status = nfs4_do_fsinfo(server, fhandle, info);
+
+	return nfs4_map_errors(status);
+}
+
+static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *mntfh,
+			      struct nfs_fsinfo *info)
+{
+	int error;
+	struct nfs_fattr *fattr = info->fattr;
+
+	error = nfs4_server_capabilities(server, mntfh);
+	if (error < 0) {
+		dprintk("nfs4_get_root: getcaps error = %d\n", -error);
+		return error;
+	}
+
+	error = nfs4_proc_getattr(server, mntfh, fattr, NULL);
+	if (error < 0) {
+		dprintk("nfs4_get_root: getattr error = %d\n", -error);
+		goto out;
+	}
+
+	if (fattr->valid & NFS_ATTR_FATTR_FSID &&
+	    !nfs_fsid_equal(&server->fsid, &fattr->fsid))
+		memcpy(&server->fsid, &fattr->fsid, sizeof(server->fsid));
+
+out:
+	return error;
+}
+
+/*
+ * Get locations and (maybe) other attributes of a referral.
+ * Note that we'll actually follow the referral later when
+ * we detect fsid mismatch in inode revalidation
+ */
+static int nfs4_get_referral(struct rpc_clnt *client, struct inode *dir,
+			     const struct qstr *name, struct nfs_fattr *fattr,
+			     struct nfs_fh *fhandle)
+{
+	int status = -ENOMEM;
+	struct page *page = NULL;
+	struct nfs4_fs_locations *locations = NULL;
+
+	page = alloc_page(GFP_KERNEL);
+	if (page == NULL)
+		goto out;
+	locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
+	if (locations == NULL)
+		goto out;
+
+	locations->fattr = fattr;
+
+	status = nfs4_proc_fs_locations(client, dir, name, locations, page);
+	if (status != 0)
+		goto out;
+
+	/*
+	 * If the fsid didn't change, this is a migration event, not a
+	 * referral.  Cause us to drop into the exception handler, which
+	 * will kick off migration recovery.
+	 */
+	if (nfs_fsid_equal(&NFS_SERVER(dir)->fsid, &fattr->fsid)) {
+		dprintk("%s: server did not return a different fsid for"
+			" a referral at %s\n", __func__, name->name);
+		status = -NFS4ERR_MOVED;
+		goto out;
+	}
+	/* Fixup attributes for the nfs_lookup() call to nfs_fhget() */
+	nfs_fixup_referral_attributes(fattr);
+	memset(fhandle, 0, sizeof(struct nfs_fh));
+out:
+	if (page)
+		__free_page(page);
+	kfree(locations);
+	return status;
+}
+
+static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
+				struct nfs_fattr *fattr, struct inode *inode)
+{
+	__u32 bitmask[NFS4_BITMASK_SZ];
+	struct nfs4_getattr_arg args = {
+		.fh = fhandle,
+		.bitmask = bitmask,
+	};
+	struct nfs4_getattr_res res = {
+		.fattr = fattr,
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	unsigned short task_flags = 0;
+
+	if (nfs4_has_session(server->nfs_client))
+		task_flags = RPC_TASK_MOVEABLE;
+
+	/* Is this is an attribute revalidation, subject to softreval? */
+	if (inode && (server->flags & NFS_MOUNT_SOFTREVAL))
+		task_flags |= RPC_TASK_TIMEOUT;
+
+	nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, fattr->label), inode, 0);
+	nfs_fattr_init(fattr);
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
+	return nfs4_do_call_sync(server->client, server, &msg,
+			&args.seq_args, &res.seq_res, task_flags);
+}
+
+int nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle,
+				struct nfs_fattr *fattr, struct inode *inode)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs4_proc_getattr(server, fhandle, fattr, inode);
+		trace_nfs4_getattr(server, fhandle, fattr, err);
+		err = nfs4_handle_exception(server, err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/* 
+ * The file is not closed if it is opened due to the a request to change
+ * the size of the file. The open call will not be needed once the
+ * VFS layer lookup-intents are implemented.
+ *
+ * Close is called when the inode is destroyed.
+ * If we haven't opened the file for O_WRONLY, we
+ * need to in the size_change case to obtain a stateid.
+ *
+ * Got race?
+ * Because OPEN is always done by name in nfsv4, it is
+ * possible that we opened a different file by the same
+ * name.  We can recognize this race condition, but we
+ * can't do anything about it besides returning an error.
+ *
+ * This will be fixed with VFS changes (lookup-intent).
+ */
+static int
+nfs4_proc_setattr(struct dentry *dentry, struct nfs_fattr *fattr,
+		  struct iattr *sattr)
+{
+	struct inode *inode = d_inode(dentry);
+	const struct cred *cred = NULL;
+	struct nfs_open_context *ctx = NULL;
+	int status;
+
+	if (pnfs_ld_layoutret_on_setattr(inode) &&
+	    sattr->ia_valid & ATTR_SIZE &&
+	    sattr->ia_size < i_size_read(inode))
+		pnfs_commit_and_return_layout(inode);
+
+	nfs_fattr_init(fattr);
+	
+	/* Deal with open(O_TRUNC) */
+	if (sattr->ia_valid & ATTR_OPEN)
+		sattr->ia_valid &= ~(ATTR_MTIME|ATTR_CTIME);
+
+	/* Optimization: if the end result is no change, don't RPC */
+	if ((sattr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
+		return 0;
+
+	/* Search for an existing open(O_WRITE) file */
+	if (sattr->ia_valid & ATTR_FILE) {
+
+		ctx = nfs_file_open_context(sattr->ia_file);
+		if (ctx)
+			cred = ctx->cred;
+	}
+
+	/* Return any delegations if we're going to change ACLs */
+	if ((sattr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
+		nfs4_inode_make_writeable(inode);
+
+	status = nfs4_do_setattr(inode, cred, fattr, sattr, ctx, NULL);
+	if (status == 0) {
+		nfs_setattr_update_inode(inode, sattr, fattr);
+		nfs_setsecurity(inode, fattr);
+	}
+	return status;
+}
+
+static int _nfs4_proc_lookup(struct rpc_clnt *clnt, struct inode *dir,
+		struct dentry *dentry, struct nfs_fh *fhandle,
+		struct nfs_fattr *fattr)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	int		       status;
+	struct nfs4_lookup_arg args = {
+		.bitmask = server->attr_bitmask,
+		.dir_fh = NFS_FH(dir),
+		.name = &dentry->d_name,
+	};
+	struct nfs4_lookup_res res = {
+		.server = server,
+		.fattr = fattr,
+		.fh = fhandle,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUP],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	unsigned short task_flags = 0;
+
+	if (nfs_server_capable(dir, NFS_CAP_MOVEABLE))
+		task_flags = RPC_TASK_MOVEABLE;
+
+	/* Is this is an attribute revalidation, subject to softreval? */
+	if (nfs_lookup_is_soft_revalidate(dentry))
+		task_flags |= RPC_TASK_TIMEOUT;
+
+	args.bitmask = nfs4_bitmask(server, fattr->label);
+
+	nfs_fattr_init(fattr);
+
+	dprintk("NFS call  lookup %pd2\n", dentry);
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
+	status = nfs4_do_call_sync(clnt, server, &msg,
+			&args.seq_args, &res.seq_res, task_flags);
+	dprintk("NFS reply lookup: %d\n", status);
+	return status;
+}
+
+static void nfs_fixup_secinfo_attributes(struct nfs_fattr *fattr)
+{
+	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
+		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_MOUNTPOINT;
+	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	fattr->nlink = 2;
+}
+
+static int nfs4_proc_lookup_common(struct rpc_clnt **clnt, struct inode *dir,
+				   struct dentry *dentry, struct nfs_fh *fhandle,
+				   struct nfs_fattr *fattr)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	struct rpc_clnt *client = *clnt;
+	const struct qstr *name = &dentry->d_name;
+	int err;
+	do {
+		err = _nfs4_proc_lookup(client, dir, dentry, fhandle, fattr);
+		trace_nfs4_lookup(dir, name, err);
+		switch (err) {
+		case -NFS4ERR_BADNAME:
+			err = -ENOENT;
+			goto out;
+		case -NFS4ERR_MOVED:
+			err = nfs4_get_referral(client, dir, name, fattr, fhandle);
+			if (err == -NFS4ERR_MOVED)
+				err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
+			goto out;
+		case -NFS4ERR_WRONGSEC:
+			err = -EPERM;
+			if (client != *clnt)
+				goto out;
+			client = nfs4_negotiate_security(client, dir, name);
+			if (IS_ERR(client))
+				return PTR_ERR(client);
+
+			exception.retry = 1;
+			break;
+		default:
+			err = nfs4_handle_exception(NFS_SERVER(dir), err, &exception);
+		}
+	} while (exception.retry);
+
+out:
+	if (err == 0)
+		*clnt = client;
+	else if (client != *clnt)
+		rpc_shutdown_client(client);
+
+	return err;
+}
+
+static int nfs4_proc_lookup(struct inode *dir, struct dentry *dentry,
+			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	int status;
+	struct rpc_clnt *client = NFS_CLIENT(dir);
+
+	status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
+	if (client != NFS_CLIENT(dir)) {
+		rpc_shutdown_client(client);
+		nfs_fixup_secinfo_attributes(fattr);
+	}
+	return status;
+}
+
+struct rpc_clnt *
+nfs4_proc_lookup_mountpoint(struct inode *dir, struct dentry *dentry,
+			    struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	struct rpc_clnt *client = NFS_CLIENT(dir);
+	int status;
+
+	status = nfs4_proc_lookup_common(&client, dir, dentry, fhandle, fattr);
+	if (status < 0)
+		return ERR_PTR(status);
+	return (client == NFS_CLIENT(dir)) ? rpc_clone_client(client) : client;
+}
+
+static int _nfs4_proc_lookupp(struct inode *inode,
+		struct nfs_fh *fhandle, struct nfs_fattr *fattr)
+{
+	struct rpc_clnt *clnt = NFS_CLIENT(inode);
+	struct nfs_server *server = NFS_SERVER(inode);
+	int		       status;
+	struct nfs4_lookupp_arg args = {
+		.bitmask = server->attr_bitmask,
+		.fh = NFS_FH(inode),
+	};
+	struct nfs4_lookupp_res res = {
+		.server = server,
+		.fattr = fattr,
+		.fh = fhandle,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOOKUPP],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	unsigned short task_flags = 0;
+
+	if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL)
+		task_flags |= RPC_TASK_TIMEOUT;
+
+	args.bitmask = nfs4_bitmask(server, fattr->label);
+
+	nfs_fattr_init(fattr);
+
+	dprintk("NFS call  lookupp ino=0x%lx\n", inode->i_ino);
+	status = nfs4_call_sync(clnt, server, &msg, &args.seq_args,
+				&res.seq_res, task_flags);
+	dprintk("NFS reply lookupp: %d\n", status);
+	return status;
+}
+
+static int nfs4_proc_lookupp(struct inode *inode, struct nfs_fh *fhandle,
+			     struct nfs_fattr *fattr)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs4_proc_lookupp(inode, fhandle, fattr);
+		trace_nfs4_lookupp(inode, err);
+		err = nfs4_handle_exception(NFS_SERVER(inode), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
+			     const struct cred *cred)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs4_accessargs args = {
+		.fh = NFS_FH(inode),
+		.access = entry->mask,
+	};
+	struct nfs4_accessres res = {
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_ACCESS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = cred,
+	};
+	int status = 0;
+
+	if (!nfs4_have_delegation(inode, FMODE_READ)) {
+		res.fattr = nfs_alloc_fattr();
+		if (res.fattr == NULL)
+			return -ENOMEM;
+		args.bitmask = server->cache_consistency_bitmask;
+	}
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	if (!status) {
+		nfs_access_set_mask(entry, res.access);
+		if (res.fattr)
+			nfs_refresh_inode(inode, res.fattr);
+	}
+	nfs_free_fattr(res.fattr);
+	return status;
+}
+
+static int nfs4_proc_access(struct inode *inode, struct nfs_access_entry *entry,
+			    const struct cred *cred)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs4_proc_access(inode, entry, cred);
+		trace_nfs4_access(inode, err);
+		err = nfs4_handle_exception(NFS_SERVER(inode), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/*
+ * TODO: For the time being, we don't try to get any attributes
+ * along with any of the zero-copy operations READ, READDIR,
+ * READLINK, WRITE.
+ *
+ * In the case of the first three, we want to put the GETATTR
+ * after the read-type operation -- this is because it is hard
+ * to predict the length of a GETATTR response in v4, and thus
+ * align the READ data correctly.  This means that the GETATTR
+ * may end up partially falling into the page cache, and we should
+ * shift it into the 'tail' of the xdr_buf before processing.
+ * To do this efficiently, we need to know the total length
+ * of data received, which doesn't seem to be available outside
+ * of the RPC layer.
+ *
+ * In the case of WRITE, we also want to put the GETATTR after
+ * the operation -- in this case because we want to make sure
+ * we get the post-operation mtime and size.
+ *
+ * Both of these changes to the XDR layer would in fact be quite
+ * minor, but I decided to leave them for a subsequent patch.
+ */
+static int _nfs4_proc_readlink(struct inode *inode, struct page *page,
+		unsigned int pgbase, unsigned int pglen)
+{
+	struct nfs4_readlink args = {
+		.fh       = NFS_FH(inode),
+		.pgbase	  = pgbase,
+		.pglen    = pglen,
+		.pages    = &page,
+	};
+	struct nfs4_readlink_res res;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READLINK],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	return nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode), &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_proc_readlink(struct inode *inode, struct page *page,
+		unsigned int pgbase, unsigned int pglen)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs4_proc_readlink(inode, page, pgbase, pglen);
+		trace_nfs4_readlink(inode, err);
+		err = nfs4_handle_exception(NFS_SERVER(inode), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/*
+ * This is just for mknod.  open(O_CREAT) will always do ->open_context().
+ */
+static int
+nfs4_proc_create(struct inode *dir, struct dentry *dentry, struct iattr *sattr,
+		 int flags)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs4_label l, *ilabel;
+	struct nfs_open_context *ctx;
+	struct nfs4_state *state;
+	int status = 0;
+
+	ctx = alloc_nfs_open_context(dentry, FMODE_READ, NULL);
+	if (IS_ERR(ctx))
+		return PTR_ERR(ctx);
+
+	ilabel = nfs4_label_init_security(dir, dentry, sattr, &l);
+
+	if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
+		sattr->ia_mode &= ~current_umask();
+	state = nfs4_do_open(dir, ctx, flags, sattr, ilabel, NULL);
+	if (IS_ERR(state)) {
+		status = PTR_ERR(state);
+		goto out;
+	}
+out:
+	nfs4_label_release_security(ilabel);
+	put_nfs_open_context(ctx);
+	return status;
+}
+
+static int
+_nfs4_proc_remove(struct inode *dir, const struct qstr *name, u32 ftype)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs_removeargs args = {
+		.fh = NFS_FH(dir),
+		.name = *name,
+	};
+	struct nfs_removeres res = {
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	unsigned long timestamp = jiffies;
+	int status;
+
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 1);
+	if (status == 0) {
+		spin_lock(&dir->i_lock);
+		/* Removing a directory decrements nlink in the parent */
+		if (ftype == NF4DIR && dir->i_nlink > 2)
+			nfs4_dec_nlink_locked(dir);
+		nfs4_update_changeattr_locked(dir, &res.cinfo, timestamp,
+					      NFS_INO_INVALID_DATA);
+		spin_unlock(&dir->i_lock);
+	}
+	return status;
+}
+
+static int nfs4_proc_remove(struct inode *dir, struct dentry *dentry)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	struct inode *inode = d_inode(dentry);
+	int err;
+
+	if (inode) {
+		if (inode->i_nlink == 1)
+			nfs4_inode_return_delegation(inode);
+		else
+			nfs4_inode_make_writeable(inode);
+	}
+	do {
+		err = _nfs4_proc_remove(dir, &dentry->d_name, NF4REG);
+		trace_nfs4_remove(dir, &dentry->d_name, err);
+		err = nfs4_handle_exception(NFS_SERVER(dir), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int nfs4_proc_rmdir(struct inode *dir, const struct qstr *name)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+
+	do {
+		err = _nfs4_proc_remove(dir, name, NF4DIR);
+		trace_nfs4_remove(dir, name, err);
+		err = nfs4_handle_exception(NFS_SERVER(dir), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static void nfs4_proc_unlink_setup(struct rpc_message *msg,
+		struct dentry *dentry,
+		struct inode *inode)
+{
+	struct nfs_removeargs *args = msg->rpc_argp;
+	struct nfs_removeres *res = msg->rpc_resp;
+
+	res->server = NFS_SB(dentry->d_sb);
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
+	nfs4_init_sequence(&args->seq_args, &res->seq_res, 1, 0);
+
+	nfs_fattr_init(res->dir_attr);
+
+	if (inode) {
+		nfs4_inode_return_delegation(inode);
+		nfs_d_prune_case_insensitive_aliases(inode);
+	}
+}
+
+static void nfs4_proc_unlink_rpc_prepare(struct rpc_task *task, struct nfs_unlinkdata *data)
+{
+	nfs4_setup_sequence(NFS_SB(data->dentry->d_sb)->nfs_client,
+			&data->args.seq_args,
+			&data->res.seq_res,
+			task);
+}
+
+static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
+{
+	struct nfs_unlinkdata *data = task->tk_calldata;
+	struct nfs_removeres *res = &data->res;
+
+	if (!nfs4_sequence_done(task, &res->seq_res))
+		return 0;
+	if (nfs4_async_handle_error(task, res->server, NULL,
+				    &data->timeout) == -EAGAIN)
+		return 0;
+	if (task->tk_status == 0)
+		nfs4_update_changeattr(dir, &res->cinfo,
+				res->dir_attr->time_start,
+				NFS_INO_INVALID_DATA);
+	return 1;
+}
+
+static void nfs4_proc_rename_setup(struct rpc_message *msg,
+		struct dentry *old_dentry,
+		struct dentry *new_dentry)
+{
+	struct nfs_renameargs *arg = msg->rpc_argp;
+	struct nfs_renameres *res = msg->rpc_resp;
+	struct inode *old_inode = d_inode(old_dentry);
+	struct inode *new_inode = d_inode(new_dentry);
+
+	if (old_inode)
+		nfs4_inode_make_writeable(old_inode);
+	if (new_inode)
+		nfs4_inode_return_delegation(new_inode);
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RENAME];
+	res->server = NFS_SB(old_dentry->d_sb);
+	nfs4_init_sequence(&arg->seq_args, &res->seq_res, 1, 0);
+}
+
+static void nfs4_proc_rename_rpc_prepare(struct rpc_task *task, struct nfs_renamedata *data)
+{
+	nfs4_setup_sequence(NFS_SERVER(data->old_dir)->nfs_client,
+			&data->args.seq_args,
+			&data->res.seq_res,
+			task);
+}
+
+static int nfs4_proc_rename_done(struct rpc_task *task, struct inode *old_dir,
+				 struct inode *new_dir)
+{
+	struct nfs_renamedata *data = task->tk_calldata;
+	struct nfs_renameres *res = &data->res;
+
+	if (!nfs4_sequence_done(task, &res->seq_res))
+		return 0;
+	if (nfs4_async_handle_error(task, res->server, NULL, &data->timeout) == -EAGAIN)
+		return 0;
+
+	if (task->tk_status == 0) {
+		nfs_d_prune_case_insensitive_aliases(d_inode(data->old_dentry));
+		if (new_dir != old_dir) {
+			/* Note: If we moved a directory, nlink will change */
+			nfs4_update_changeattr(old_dir, &res->old_cinfo,
+					res->old_fattr->time_start,
+					NFS_INO_INVALID_NLINK |
+					    NFS_INO_INVALID_DATA);
+			nfs4_update_changeattr(new_dir, &res->new_cinfo,
+					res->new_fattr->time_start,
+					NFS_INO_INVALID_NLINK |
+					    NFS_INO_INVALID_DATA);
+		} else
+			nfs4_update_changeattr(old_dir, &res->old_cinfo,
+					res->old_fattr->time_start,
+					NFS_INO_INVALID_DATA);
+	}
+	return 1;
+}
+
+static int _nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	__u32 bitmask[NFS4_BITMASK_SZ];
+	struct nfs4_link_arg arg = {
+		.fh     = NFS_FH(inode),
+		.dir_fh = NFS_FH(dir),
+		.name   = name,
+		.bitmask = bitmask,
+	};
+	struct nfs4_link_res res = {
+		.server = server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LINK],
+		.rpc_argp = &arg,
+		.rpc_resp = &res,
+	};
+	int status = -ENOMEM;
+
+	res.fattr = nfs_alloc_fattr_with_label(server);
+	if (res.fattr == NULL)
+		goto out;
+
+	nfs4_inode_make_writeable(inode);
+	nfs4_bitmap_copy_adjust(bitmask, nfs4_bitmask(server, res.fattr->label), inode,
+				NFS_INO_INVALID_CHANGE);
+	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+	if (!status) {
+		nfs4_update_changeattr(dir, &res.cinfo, res.fattr->time_start,
+				       NFS_INO_INVALID_DATA);
+		nfs4_inc_nlink(inode);
+		status = nfs_post_op_update_inode(inode, res.fattr);
+		if (!status)
+			nfs_setsecurity(inode, res.fattr);
+	}
+
+out:
+	nfs_free_fattr(res.fattr);
+	return status;
+}
+
+static int nfs4_proc_link(struct inode *inode, struct inode *dir, const struct qstr *name)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = nfs4_handle_exception(NFS_SERVER(inode),
+				_nfs4_proc_link(inode, dir, name),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+struct nfs4_createdata {
+	struct rpc_message msg;
+	struct nfs4_create_arg arg;
+	struct nfs4_create_res res;
+	struct nfs_fh fh;
+	struct nfs_fattr fattr;
+};
+
+static struct nfs4_createdata *nfs4_alloc_createdata(struct inode *dir,
+		const struct qstr *name, struct iattr *sattr, u32 ftype)
+{
+	struct nfs4_createdata *data;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data != NULL) {
+		struct nfs_server *server = NFS_SERVER(dir);
+
+		data->fattr.label = nfs4_label_alloc(server, GFP_KERNEL);
+		if (IS_ERR(data->fattr.label))
+			goto out_free;
+
+		data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE];
+		data->msg.rpc_argp = &data->arg;
+		data->msg.rpc_resp = &data->res;
+		data->arg.dir_fh = NFS_FH(dir);
+		data->arg.server = server;
+		data->arg.name = name;
+		data->arg.attrs = sattr;
+		data->arg.ftype = ftype;
+		data->arg.bitmask = nfs4_bitmask(server, data->fattr.label);
+		data->arg.umask = current_umask();
+		data->res.server = server;
+		data->res.fh = &data->fh;
+		data->res.fattr = &data->fattr;
+		nfs_fattr_init(data->res.fattr);
+	}
+	return data;
+out_free:
+	kfree(data);
+	return NULL;
+}
+
+static int nfs4_do_create(struct inode *dir, struct dentry *dentry, struct nfs4_createdata *data)
+{
+	int status = nfs4_call_sync(NFS_SERVER(dir)->client, NFS_SERVER(dir), &data->msg,
+				    &data->arg.seq_args, &data->res.seq_res, 1);
+	if (status == 0) {
+		spin_lock(&dir->i_lock);
+		/* Creating a directory bumps nlink in the parent */
+		if (data->arg.ftype == NF4DIR)
+			nfs4_inc_nlink_locked(dir);
+		nfs4_update_changeattr_locked(dir, &data->res.dir_cinfo,
+					      data->res.fattr->time_start,
+					      NFS_INO_INVALID_DATA);
+		spin_unlock(&dir->i_lock);
+		status = nfs_instantiate(dentry, data->res.fh, data->res.fattr);
+	}
+	return status;
+}
+
+static void nfs4_free_createdata(struct nfs4_createdata *data)
+{
+	nfs4_label_free(data->fattr.label);
+	kfree(data);
+}
+
+static int _nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
+		struct page *page, unsigned int len, struct iattr *sattr,
+		struct nfs4_label *label)
+{
+	struct nfs4_createdata *data;
+	int status = -ENAMETOOLONG;
+
+	if (len > NFS4_MAXPATHLEN)
+		goto out;
+
+	status = -ENOMEM;
+	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4LNK);
+	if (data == NULL)
+		goto out;
+
+	data->msg.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SYMLINK];
+	data->arg.u.symlink.pages = &page;
+	data->arg.u.symlink.len = len;
+	data->arg.label = label;
+	
+	status = nfs4_do_create(dir, dentry, data);
+
+	nfs4_free_createdata(data);
+out:
+	return status;
+}
+
+static int nfs4_proc_symlink(struct inode *dir, struct dentry *dentry,
+		struct page *page, unsigned int len, struct iattr *sattr)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	struct nfs4_label l, *label;
+	int err;
+
+	label = nfs4_label_init_security(dir, dentry, sattr, &l);
+
+	do {
+		err = _nfs4_proc_symlink(dir, dentry, page, len, sattr, label);
+		trace_nfs4_symlink(dir, &dentry->d_name, err);
+		err = nfs4_handle_exception(NFS_SERVER(dir), err,
+				&exception);
+	} while (exception.retry);
+
+	nfs4_label_release_security(label);
+	return err;
+}
+
+static int _nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr, struct nfs4_label *label)
+{
+	struct nfs4_createdata *data;
+	int status = -ENOMEM;
+
+	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4DIR);
+	if (data == NULL)
+		goto out;
+
+	data->arg.label = label;
+	status = nfs4_do_create(dir, dentry, data);
+
+	nfs4_free_createdata(data);
+out:
+	return status;
+}
+
+static int nfs4_proc_mkdir(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	struct nfs4_label l, *label;
+	int err;
+
+	label = nfs4_label_init_security(dir, dentry, sattr, &l);
+
+	if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
+		sattr->ia_mode &= ~current_umask();
+	do {
+		err = _nfs4_proc_mkdir(dir, dentry, sattr, label);
+		trace_nfs4_mkdir(dir, &dentry->d_name, err);
+		err = nfs4_handle_exception(NFS_SERVER(dir), err,
+				&exception);
+	} while (exception.retry);
+	nfs4_label_release_security(label);
+
+	return err;
+}
+
+static int _nfs4_proc_readdir(struct nfs_readdir_arg *nr_arg,
+			      struct nfs_readdir_res *nr_res)
+{
+	struct inode		*dir = d_inode(nr_arg->dentry);
+	struct nfs_server	*server = NFS_SERVER(dir);
+	struct nfs4_readdir_arg args = {
+		.fh = NFS_FH(dir),
+		.pages = nr_arg->pages,
+		.pgbase = 0,
+		.count = nr_arg->page_len,
+		.plus = nr_arg->plus,
+	};
+	struct nfs4_readdir_res res;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READDIR],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = nr_arg->cred,
+	};
+	int			status;
+
+	dprintk("%s: dentry = %pd2, cookie = %llu\n", __func__,
+		nr_arg->dentry, (unsigned long long)nr_arg->cookie);
+	if (!(server->caps & NFS_CAP_SECURITY_LABEL))
+		args.bitmask = server->attr_bitmask_nl;
+	else
+		args.bitmask = server->attr_bitmask;
+
+	nfs4_setup_readdir(nr_arg->cookie, nr_arg->verf, nr_arg->dentry, &args);
+	res.pgbase = args.pgbase;
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args,
+			&res.seq_res, 0);
+	if (status >= 0) {
+		memcpy(nr_res->verf, res.verifier.data, NFS4_VERIFIER_SIZE);
+		status += args.pgbase;
+	}
+
+	nfs_invalidate_atime(dir);
+
+	dprintk("%s: returns %d\n", __func__, status);
+	return status;
+}
+
+static int nfs4_proc_readdir(struct nfs_readdir_arg *arg,
+			     struct nfs_readdir_res *res)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs4_proc_readdir(arg, res);
+		trace_nfs4_readdir(d_inode(arg->dentry), err);
+		err = nfs4_handle_exception(NFS_SERVER(d_inode(arg->dentry)),
+					    err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr, struct nfs4_label *label, dev_t rdev)
+{
+	struct nfs4_createdata *data;
+	int mode = sattr->ia_mode;
+	int status = -ENOMEM;
+
+	data = nfs4_alloc_createdata(dir, &dentry->d_name, sattr, NF4SOCK);
+	if (data == NULL)
+		goto out;
+
+	if (S_ISFIFO(mode))
+		data->arg.ftype = NF4FIFO;
+	else if (S_ISBLK(mode)) {
+		data->arg.ftype = NF4BLK;
+		data->arg.u.device.specdata1 = MAJOR(rdev);
+		data->arg.u.device.specdata2 = MINOR(rdev);
+	}
+	else if (S_ISCHR(mode)) {
+		data->arg.ftype = NF4CHR;
+		data->arg.u.device.specdata1 = MAJOR(rdev);
+		data->arg.u.device.specdata2 = MINOR(rdev);
+	} else if (!S_ISSOCK(mode)) {
+		status = -EINVAL;
+		goto out_free;
+	}
+
+	data->arg.label = label;
+	status = nfs4_do_create(dir, dentry, data);
+out_free:
+	nfs4_free_createdata(data);
+out:
+	return status;
+}
+
+static int nfs4_proc_mknod(struct inode *dir, struct dentry *dentry,
+		struct iattr *sattr, dev_t rdev)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	struct nfs4_label l, *label;
+	int err;
+
+	label = nfs4_label_init_security(dir, dentry, sattr, &l);
+
+	if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK))
+		sattr->ia_mode &= ~current_umask();
+	do {
+		err = _nfs4_proc_mknod(dir, dentry, sattr, label, rdev);
+		trace_nfs4_mknod(dir, &dentry->d_name, err);
+		err = nfs4_handle_exception(NFS_SERVER(dir), err,
+				&exception);
+	} while (exception.retry);
+
+	nfs4_label_release_security(label);
+
+	return err;
+}
+
+static int _nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle,
+		 struct nfs_fsstat *fsstat)
+{
+	struct nfs4_statfs_arg args = {
+		.fh = fhandle,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_statfs_res res = {
+		.fsstat = fsstat,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_STATFS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	nfs_fattr_init(fsstat->fattr);
+	return  nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_proc_statfs(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsstat *fsstat)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_proc_statfs(server, fhandle, fsstat),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_fsinfo *fsinfo)
+{
+	struct nfs4_fsinfo_arg args = {
+		.fh = fhandle,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_fsinfo_res res = {
+		.fsinfo = fsinfo,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FSINFO],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_do_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+
+	do {
+		err = _nfs4_do_fsinfo(server, fhandle, fsinfo);
+		trace_nfs4_fsinfo(server, fhandle, fsinfo->fattr, err);
+		if (err == 0) {
+			nfs4_set_lease_period(server->nfs_client, fsinfo->lease_time * HZ);
+			break;
+		}
+		err = nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int nfs4_proc_fsinfo(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fsinfo *fsinfo)
+{
+	int error;
+
+	nfs_fattr_init(fsinfo->fattr);
+	error = nfs4_do_fsinfo(server, fhandle, fsinfo);
+	if (error == 0) {
+		/* block layout checks this! */
+		server->pnfs_blksize = fsinfo->blksize;
+		set_pnfs_layoutdriver(server, fhandle, fsinfo);
+	}
+
+	return error;
+}
+
+static int _nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_pathconf *pathconf)
+{
+	struct nfs4_pathconf_arg args = {
+		.fh = fhandle,
+		.bitmask = server->attr_bitmask,
+	};
+	struct nfs4_pathconf_res res = {
+		.pathconf = pathconf,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_PATHCONF],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+
+	/* None of the pathconf attributes are mandatory to implement */
+	if ((args.bitmask[0] & nfs4_pathconf_bitmap[0]) == 0) {
+		memset(pathconf, 0, sizeof(*pathconf));
+		return 0;
+	}
+
+	nfs_fattr_init(pathconf->fattr);
+	return nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+}
+
+static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
+		struct nfs_pathconf *pathconf)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+
+	do {
+		err = nfs4_handle_exception(server,
+				_nfs4_proc_pathconf(server, fhandle, pathconf),
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+int nfs4_set_rw_stateid(nfs4_stateid *stateid,
+		const struct nfs_open_context *ctx,
+		const struct nfs_lock_context *l_ctx,
+		fmode_t fmode)
+{
+	return nfs4_select_rw_stateid(ctx->state, fmode, l_ctx, stateid, NULL);
+}
+EXPORT_SYMBOL_GPL(nfs4_set_rw_stateid);
+
+static bool nfs4_stateid_is_current(nfs4_stateid *stateid,
+		const struct nfs_open_context *ctx,
+		const struct nfs_lock_context *l_ctx,
+		fmode_t fmode)
+{
+	nfs4_stateid _current_stateid;
+
+	/* If the current stateid represents a lost lock, then exit */
+	if (nfs4_set_rw_stateid(&_current_stateid, ctx, l_ctx, fmode) == -EIO)
+		return true;
+	return nfs4_stateid_match(stateid, &_current_stateid);
+}
+
+static bool nfs4_error_stateid_expired(int err)
+{
+	switch (err) {
+	case -NFS4ERR_DELEG_REVOKED:
+	case -NFS4ERR_ADMIN_REVOKED:
+	case -NFS4ERR_BAD_STATEID:
+	case -NFS4ERR_STALE_STATEID:
+	case -NFS4ERR_OLD_STATEID:
+	case -NFS4ERR_OPENMODE:
+	case -NFS4ERR_EXPIRED:
+		return true;
+	}
+	return false;
+}
+
+static int nfs4_read_done_cb(struct rpc_task *task, struct nfs_pgio_header *hdr)
+{
+	struct nfs_server *server = NFS_SERVER(hdr->inode);
+
+	trace_nfs4_read(hdr, task->tk_status);
+	if (task->tk_status < 0) {
+		struct nfs4_exception exception = {
+			.inode = hdr->inode,
+			.state = hdr->args.context->state,
+			.stateid = &hdr->args.stateid,
+		};
+		task->tk_status = nfs4_async_handle_exception(task,
+				server, task->tk_status, &exception);
+		if (exception.retry) {
+			rpc_restart_call_prepare(task);
+			return -EAGAIN;
+		}
+	}
+
+	if (task->tk_status > 0)
+		renew_lease(server, hdr->timestamp);
+	return 0;
+}
+
+static bool nfs4_read_stateid_changed(struct rpc_task *task,
+		struct nfs_pgio_args *args)
+{
+
+	if (!nfs4_error_stateid_expired(task->tk_status) ||
+		nfs4_stateid_is_current(&args->stateid,
+				args->context,
+				args->lock_context,
+				FMODE_READ))
+		return false;
+	rpc_restart_call_prepare(task);
+	return true;
+}
+
+static bool nfs4_read_plus_not_supported(struct rpc_task *task,
+					 struct nfs_pgio_header *hdr)
+{
+	struct nfs_server *server = NFS_SERVER(hdr->inode);
+	struct rpc_message *msg = &task->tk_msg;
+
+	if (msg->rpc_proc == &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS] &&
+	    server->caps & NFS_CAP_READ_PLUS && task->tk_status == -ENOTSUPP) {
+		server->caps &= ~NFS_CAP_READ_PLUS;
+		msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
+		rpc_restart_call_prepare(task);
+		return true;
+	}
+	return false;
+}
+
+static int nfs4_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
+{
+	if (!nfs4_sequence_done(task, &hdr->res.seq_res))
+		return -EAGAIN;
+	if (nfs4_read_stateid_changed(task, &hdr->args))
+		return -EAGAIN;
+	if (nfs4_read_plus_not_supported(task, hdr))
+		return -EAGAIN;
+	if (task->tk_status > 0)
+		nfs_invalidate_atime(hdr->inode);
+	return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
+				    nfs4_read_done_cb(task, hdr);
+}
+
+#if defined CONFIG_NFS_V4_2 && defined CONFIG_NFS_V4_2_READ_PLUS
+static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
+				    struct rpc_message *msg)
+{
+	/* Note: We don't use READ_PLUS with pNFS yet */
+	if (nfs_server_capable(hdr->inode, NFS_CAP_READ_PLUS) && !hdr->ds_clp) {
+		msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ_PLUS];
+		return nfs_read_alloc_scratch(hdr, READ_PLUS_SCRATCH_SIZE);
+	}
+	return false;
+}
+#else
+static bool nfs42_read_plus_support(struct nfs_pgio_header *hdr,
+				    struct rpc_message *msg)
+{
+	return false;
+}
+#endif /* CONFIG_NFS_V4_2 */
+
+static void nfs4_proc_read_setup(struct nfs_pgio_header *hdr,
+				 struct rpc_message *msg)
+{
+	hdr->timestamp   = jiffies;
+	if (!hdr->pgio_done_cb)
+		hdr->pgio_done_cb = nfs4_read_done_cb;
+	if (!nfs42_read_plus_support(hdr, msg))
+		msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ];
+	nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
+}
+
+static int nfs4_proc_pgio_rpc_prepare(struct rpc_task *task,
+				      struct nfs_pgio_header *hdr)
+{
+	if (nfs4_setup_sequence(NFS_SERVER(hdr->inode)->nfs_client,
+			&hdr->args.seq_args,
+			&hdr->res.seq_res,
+			task))
+		return 0;
+	if (nfs4_set_rw_stateid(&hdr->args.stateid, hdr->args.context,
+				hdr->args.lock_context,
+				hdr->rw_mode) == -EIO)
+		return -EIO;
+	if (unlikely(test_bit(NFS_CONTEXT_BAD, &hdr->args.context->flags)))
+		return -EIO;
+	return 0;
+}
+
+static int nfs4_write_done_cb(struct rpc_task *task,
+			      struct nfs_pgio_header *hdr)
+{
+	struct inode *inode = hdr->inode;
+
+	trace_nfs4_write(hdr, task->tk_status);
+	if (task->tk_status < 0) {
+		struct nfs4_exception exception = {
+			.inode = hdr->inode,
+			.state = hdr->args.context->state,
+			.stateid = &hdr->args.stateid,
+		};
+		task->tk_status = nfs4_async_handle_exception(task,
+				NFS_SERVER(inode), task->tk_status,
+				&exception);
+		if (exception.retry) {
+			rpc_restart_call_prepare(task);
+			return -EAGAIN;
+		}
+	}
+	if (task->tk_status >= 0) {
+		renew_lease(NFS_SERVER(inode), hdr->timestamp);
+		nfs_writeback_update_inode(hdr);
+	}
+	return 0;
+}
+
+static bool nfs4_write_stateid_changed(struct rpc_task *task,
+		struct nfs_pgio_args *args)
+{
+
+	if (!nfs4_error_stateid_expired(task->tk_status) ||
+		nfs4_stateid_is_current(&args->stateid,
+				args->context,
+				args->lock_context,
+				FMODE_WRITE))
+		return false;
+	rpc_restart_call_prepare(task);
+	return true;
+}
+
+static int nfs4_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
+{
+	if (!nfs4_sequence_done(task, &hdr->res.seq_res))
+		return -EAGAIN;
+	if (nfs4_write_stateid_changed(task, &hdr->args))
+		return -EAGAIN;
+	return hdr->pgio_done_cb ? hdr->pgio_done_cb(task, hdr) :
+		nfs4_write_done_cb(task, hdr);
+}
+
+static
+bool nfs4_write_need_cache_consistency_data(struct nfs_pgio_header *hdr)
+{
+	/* Don't request attributes for pNFS or O_DIRECT writes */
+	if (hdr->ds_clp != NULL || hdr->dreq != NULL)
+		return false;
+	/* Otherwise, request attributes if and only if we don't hold
+	 * a delegation
+	 */
+	return nfs4_have_delegation(hdr->inode, FMODE_READ) == 0;
+}
+
+void nfs4_bitmask_set(__u32 bitmask[], const __u32 src[],
+		      struct inode *inode, unsigned long cache_validity)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	unsigned int i;
+
+	memcpy(bitmask, src, sizeof(*bitmask) * NFS4_BITMASK_SZ);
+	cache_validity |= READ_ONCE(NFS_I(inode)->cache_validity);
+
+	if (cache_validity & NFS_INO_INVALID_CHANGE)
+		bitmask[0] |= FATTR4_WORD0_CHANGE;
+	if (cache_validity & NFS_INO_INVALID_ATIME)
+		bitmask[1] |= FATTR4_WORD1_TIME_ACCESS;
+	if (cache_validity & NFS_INO_INVALID_MODE)
+		bitmask[1] |= FATTR4_WORD1_MODE;
+	if (cache_validity & NFS_INO_INVALID_OTHER)
+		bitmask[1] |= FATTR4_WORD1_OWNER | FATTR4_WORD1_OWNER_GROUP;
+	if (cache_validity & NFS_INO_INVALID_NLINK)
+		bitmask[1] |= FATTR4_WORD1_NUMLINKS;
+	if (cache_validity & NFS_INO_INVALID_CTIME)
+		bitmask[1] |= FATTR4_WORD1_TIME_METADATA;
+	if (cache_validity & NFS_INO_INVALID_MTIME)
+		bitmask[1] |= FATTR4_WORD1_TIME_MODIFY;
+	if (cache_validity & NFS_INO_INVALID_BLOCKS)
+		bitmask[1] |= FATTR4_WORD1_SPACE_USED;
+
+	if (cache_validity & NFS_INO_INVALID_SIZE)
+		bitmask[0] |= FATTR4_WORD0_SIZE;
+
+	for (i = 0; i < NFS4_BITMASK_SZ; i++)
+		bitmask[i] &= server->attr_bitmask[i];
+}
+
+static void nfs4_proc_write_setup(struct nfs_pgio_header *hdr,
+				  struct rpc_message *msg,
+				  struct rpc_clnt **clnt)
+{
+	struct nfs_server *server = NFS_SERVER(hdr->inode);
+
+	if (!nfs4_write_need_cache_consistency_data(hdr)) {
+		hdr->args.bitmask = NULL;
+		hdr->res.fattr = NULL;
+	} else {
+		nfs4_bitmask_set(hdr->args.bitmask_store,
+				 server->cache_consistency_bitmask,
+				 hdr->inode, NFS_INO_INVALID_BLOCKS);
+		hdr->args.bitmask = hdr->args.bitmask_store;
+	}
+
+	if (!hdr->pgio_done_cb)
+		hdr->pgio_done_cb = nfs4_write_done_cb;
+	hdr->res.server = server;
+	hdr->timestamp   = jiffies;
+
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_WRITE];
+	nfs4_init_sequence(&hdr->args.seq_args, &hdr->res.seq_res, 0, 0);
+	nfs4_state_protect_write(hdr->ds_clp ? hdr->ds_clp : server->nfs_client, clnt, msg, hdr);
+}
+
+static void nfs4_proc_commit_rpc_prepare(struct rpc_task *task, struct nfs_commit_data *data)
+{
+	nfs4_setup_sequence(NFS_SERVER(data->inode)->nfs_client,
+			&data->args.seq_args,
+			&data->res.seq_res,
+			task);
+}
+
+static int nfs4_commit_done_cb(struct rpc_task *task, struct nfs_commit_data *data)
+{
+	struct inode *inode = data->inode;
+
+	trace_nfs4_commit(data, task->tk_status);
+	if (nfs4_async_handle_error(task, NFS_SERVER(inode),
+				    NULL, NULL) == -EAGAIN) {
+		rpc_restart_call_prepare(task);
+		return -EAGAIN;
+	}
+	return 0;
+}
+
+static int nfs4_commit_done(struct rpc_task *task, struct nfs_commit_data *data)
+{
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return -EAGAIN;
+	return data->commit_done_cb(task, data);
+}
+
+static void nfs4_proc_commit_setup(struct nfs_commit_data *data, struct rpc_message *msg,
+				   struct rpc_clnt **clnt)
+{
+	struct nfs_server *server = NFS_SERVER(data->inode);
+
+	if (data->commit_done_cb == NULL)
+		data->commit_done_cb = nfs4_commit_done_cb;
+	data->res.server = server;
+	msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT];
+	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
+	nfs4_state_protect(data->ds_clp ? data->ds_clp : server->nfs_client,
+			NFS_SP4_MACH_CRED_COMMIT, clnt, msg);
+}
+
+static int _nfs4_proc_commit(struct file *dst, struct nfs_commitargs *args,
+				struct nfs_commitres *res)
+{
+	struct inode *dst_inode = file_inode(dst);
+	struct nfs_server *server = NFS_SERVER(dst_inode);
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_COMMIT],
+		.rpc_argp = args,
+		.rpc_resp = res,
+	};
+
+	args->fh = NFS_FH(dst_inode);
+	return nfs4_call_sync(server->client, server, &msg,
+			&args->seq_args, &res->seq_res, 1);
+}
+
+int nfs4_proc_commit(struct file *dst, __u64 offset, __u32 count, struct nfs_commitres *res)
+{
+	struct nfs_commitargs args = {
+		.offset = offset,
+		.count = count,
+	};
+	struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
+	struct nfs4_exception exception = { };
+	int status;
+
+	do {
+		status = _nfs4_proc_commit(dst, &args, res);
+		status = nfs4_handle_exception(dst_server, status, &exception);
+	} while (exception.retry);
+
+	return status;
+}
+
+struct nfs4_renewdata {
+	struct nfs_client	*client;
+	unsigned long		timestamp;
+};
+
+/*
+ * nfs4_proc_async_renew(): This is not one of the nfs_rpc_ops; it is a special
+ * standalone procedure for queueing an asynchronous RENEW.
+ */
+static void nfs4_renew_release(void *calldata)
+{
+	struct nfs4_renewdata *data = calldata;
+	struct nfs_client *clp = data->client;
+
+	if (refcount_read(&clp->cl_count) > 1)
+		nfs4_schedule_state_renewal(clp);
+	nfs_put_client(clp);
+	kfree(data);
+}
+
+static void nfs4_renew_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_renewdata *data = calldata;
+	struct nfs_client *clp = data->client;
+	unsigned long timestamp = data->timestamp;
+
+	trace_nfs4_renew_async(clp, task->tk_status);
+	switch (task->tk_status) {
+	case 0:
+		break;
+	case -NFS4ERR_LEASE_MOVED:
+		nfs4_schedule_lease_moved_recovery(clp);
+		break;
+	default:
+		/* Unless we're shutting down, schedule state recovery! */
+		if (test_bit(NFS_CS_RENEWD, &clp->cl_res_state) == 0)
+			return;
+		if (task->tk_status != NFS4ERR_CB_PATH_DOWN) {
+			nfs4_schedule_lease_recovery(clp);
+			return;
+		}
+		nfs4_schedule_path_down_recovery(clp);
+	}
+	do_renew_lease(clp, timestamp);
+}
+
+static const struct rpc_call_ops nfs4_renew_ops = {
+	.rpc_call_done = nfs4_renew_done,
+	.rpc_release = nfs4_renew_release,
+};
+
+static int nfs4_proc_async_renew(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
+{
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
+		.rpc_argp	= clp,
+		.rpc_cred	= cred,
+	};
+	struct nfs4_renewdata *data;
+
+	if (renew_flags == 0)
+		return 0;
+	if (!refcount_inc_not_zero(&clp->cl_count))
+		return -EIO;
+	data = kmalloc(sizeof(*data), GFP_NOFS);
+	if (data == NULL) {
+		nfs_put_client(clp);
+		return -ENOMEM;
+	}
+	data->client = clp;
+	data->timestamp = jiffies;
+	return rpc_call_async(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT,
+			&nfs4_renew_ops, data);
+}
+
+static int nfs4_proc_renew(struct nfs_client *clp, const struct cred *cred)
+{
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_RENEW],
+		.rpc_argp	= clp,
+		.rpc_cred	= cred,
+	};
+	unsigned long now = jiffies;
+	int status;
+
+	status = rpc_call_sync(clp->cl_rpcclient, &msg, RPC_TASK_TIMEOUT);
+	if (status < 0)
+		return status;
+	do_renew_lease(clp, now);
+	return 0;
+}
+
+static bool nfs4_server_supports_acls(const struct nfs_server *server,
+				      enum nfs4_acl_type type)
+{
+	switch (type) {
+	default:
+		return server->attr_bitmask[0] & FATTR4_WORD0_ACL;
+	case NFS4ACL_DACL:
+		return server->attr_bitmask[1] & FATTR4_WORD1_DACL;
+	case NFS4ACL_SACL:
+		return server->attr_bitmask[1] & FATTR4_WORD1_SACL;
+	}
+}
+
+/* Assuming that XATTR_SIZE_MAX is a multiple of PAGE_SIZE, and that
+ * it's OK to put sizeof(void) * (XATTR_SIZE_MAX/PAGE_SIZE) bytes on
+ * the stack.
+ */
+#define NFS4ACL_MAXPAGES DIV_ROUND_UP(XATTR_SIZE_MAX, PAGE_SIZE)
+
+int nfs4_buf_to_pages_noslab(const void *buf, size_t buflen,
+		struct page **pages)
+{
+	struct page *newpage, **spages;
+	int rc = 0;
+	size_t len;
+	spages = pages;
+
+	do {
+		len = min_t(size_t, PAGE_SIZE, buflen);
+		newpage = alloc_page(GFP_KERNEL);
+
+		if (newpage == NULL)
+			goto unwind;
+		memcpy(page_address(newpage), buf, len);
+		buf += len;
+		buflen -= len;
+		*pages++ = newpage;
+		rc++;
+	} while (buflen != 0);
+
+	return rc;
+
+unwind:
+	for(; rc > 0; rc--)
+		__free_page(spages[rc-1]);
+	return -ENOMEM;
+}
+
+struct nfs4_cached_acl {
+	enum nfs4_acl_type type;
+	int cached;
+	size_t len;
+	char data[];
+};
+
+static void nfs4_set_cached_acl(struct inode *inode, struct nfs4_cached_acl *acl)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+
+	spin_lock(&inode->i_lock);
+	kfree(nfsi->nfs4_acl);
+	nfsi->nfs4_acl = acl;
+	spin_unlock(&inode->i_lock);
+}
+
+static void nfs4_zap_acl_attr(struct inode *inode)
+{
+	nfs4_set_cached_acl(inode, NULL);
+}
+
+static ssize_t nfs4_read_cached_acl(struct inode *inode, char *buf,
+				    size_t buflen, enum nfs4_acl_type type)
+{
+	struct nfs_inode *nfsi = NFS_I(inode);
+	struct nfs4_cached_acl *acl;
+	int ret = -ENOENT;
+
+	spin_lock(&inode->i_lock);
+	acl = nfsi->nfs4_acl;
+	if (acl == NULL)
+		goto out;
+	if (acl->type != type)
+		goto out;
+	if (buf == NULL) /* user is just asking for length */
+		goto out_len;
+	if (acl->cached == 0)
+		goto out;
+	ret = -ERANGE; /* see getxattr(2) man page */
+	if (acl->len > buflen)
+		goto out;
+	memcpy(buf, acl->data, acl->len);
+out_len:
+	ret = acl->len;
+out:
+	spin_unlock(&inode->i_lock);
+	return ret;
+}
+
+static void nfs4_write_cached_acl(struct inode *inode, struct page **pages,
+				  size_t pgbase, size_t acl_len,
+				  enum nfs4_acl_type type)
+{
+	struct nfs4_cached_acl *acl;
+	size_t buflen = sizeof(*acl) + acl_len;
+
+	if (buflen <= PAGE_SIZE) {
+		acl = kmalloc(buflen, GFP_KERNEL);
+		if (acl == NULL)
+			goto out;
+		acl->cached = 1;
+		_copy_from_pages(acl->data, pages, pgbase, acl_len);
+	} else {
+		acl = kmalloc(sizeof(*acl), GFP_KERNEL);
+		if (acl == NULL)
+			goto out;
+		acl->cached = 0;
+	}
+	acl->type = type;
+	acl->len = acl_len;
+out:
+	nfs4_set_cached_acl(inode, acl);
+}
+
+/*
+ * The getxattr API returns the required buffer length when called with a
+ * NULL buf. The NFSv4 acl tool then calls getxattr again after allocating
+ * the required buf.  On a NULL buf, we send a page of data to the server
+ * guessing that the ACL request can be serviced by a page. If so, we cache
+ * up to the page of ACL data, and the 2nd call to getxattr is serviced by
+ * the cache. If not so, we throw away the page, and cache the required
+ * length. The next getxattr call will then produce another round trip to
+ * the server, this time with the input buf of the required size.
+ */
+static ssize_t __nfs4_get_acl_uncached(struct inode *inode, void *buf,
+				       size_t buflen, enum nfs4_acl_type type)
+{
+	struct page **pages;
+	struct nfs_getaclargs args = {
+		.fh = NFS_FH(inode),
+		.acl_type = type,
+		.acl_len = buflen,
+	};
+	struct nfs_getaclres res = {
+		.acl_type = type,
+		.acl_len = buflen,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETACL],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	unsigned int npages;
+	int ret = -ENOMEM, i;
+	struct nfs_server *server = NFS_SERVER(inode);
+
+	if (buflen == 0)
+		buflen = server->rsize;
+
+	npages = DIV_ROUND_UP(buflen, PAGE_SIZE) + 1;
+	pages = kmalloc_array(npages, sizeof(struct page *), GFP_KERNEL);
+	if (!pages)
+		return -ENOMEM;
+
+	args.acl_pages = pages;
+
+	for (i = 0; i < npages; i++) {
+		pages[i] = alloc_page(GFP_KERNEL);
+		if (!pages[i])
+			goto out_free;
+	}
+
+	/* for decoding across pages */
+	res.acl_scratch = alloc_page(GFP_KERNEL);
+	if (!res.acl_scratch)
+		goto out_free;
+
+	args.acl_len = npages * PAGE_SIZE;
+
+	dprintk("%s  buf %p buflen %zu npages %d args.acl_len %zu\n",
+		__func__, buf, buflen, npages, args.acl_len);
+	ret = nfs4_call_sync(NFS_SERVER(inode)->client, NFS_SERVER(inode),
+			     &msg, &args.seq_args, &res.seq_res, 0);
+	if (ret)
+		goto out_free;
+
+	/* Handle the case where the passed-in buffer is too short */
+	if (res.acl_flags & NFS4_ACL_TRUNC) {
+		/* Did the user only issue a request for the acl length? */
+		if (buf == NULL)
+			goto out_ok;
+		ret = -ERANGE;
+		goto out_free;
+	}
+	nfs4_write_cached_acl(inode, pages, res.acl_data_offset, res.acl_len,
+			      type);
+	if (buf) {
+		if (res.acl_len > buflen) {
+			ret = -ERANGE;
+			goto out_free;
+		}
+		_copy_from_pages(buf, pages, res.acl_data_offset, res.acl_len);
+	}
+out_ok:
+	ret = res.acl_len;
+out_free:
+	while (--i >= 0)
+		__free_page(pages[i]);
+	if (res.acl_scratch)
+		__free_page(res.acl_scratch);
+	kfree(pages);
+	return ret;
+}
+
+static ssize_t nfs4_get_acl_uncached(struct inode *inode, void *buf,
+				     size_t buflen, enum nfs4_acl_type type)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	ssize_t ret;
+	do {
+		ret = __nfs4_get_acl_uncached(inode, buf, buflen, type);
+		trace_nfs4_get_acl(inode, ret);
+		if (ret >= 0)
+			break;
+		ret = nfs4_handle_exception(NFS_SERVER(inode), ret, &exception);
+	} while (exception.retry);
+	return ret;
+}
+
+static ssize_t nfs4_proc_get_acl(struct inode *inode, void *buf, size_t buflen,
+				 enum nfs4_acl_type type)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	int ret;
+
+	if (!nfs4_server_supports_acls(server, type))
+		return -EOPNOTSUPP;
+	ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
+	if (ret < 0)
+		return ret;
+	if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_ACL)
+		nfs_zap_acl_cache(inode);
+	ret = nfs4_read_cached_acl(inode, buf, buflen, type);
+	if (ret != -ENOENT)
+		/* -ENOENT is returned if there is no ACL or if there is an ACL
+		 * but no cached acl data, just the acl length */
+		return ret;
+	return nfs4_get_acl_uncached(inode, buf, buflen, type);
+}
+
+static int __nfs4_proc_set_acl(struct inode *inode, const void *buf,
+			       size_t buflen, enum nfs4_acl_type type)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct page *pages[NFS4ACL_MAXPAGES];
+	struct nfs_setaclargs arg = {
+		.fh = NFS_FH(inode),
+		.acl_type = type,
+		.acl_len = buflen,
+		.acl_pages = pages,
+	};
+	struct nfs_setaclres res;
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETACL],
+		.rpc_argp	= &arg,
+		.rpc_resp	= &res,
+	};
+	unsigned int npages = DIV_ROUND_UP(buflen, PAGE_SIZE);
+	int ret, i;
+
+	/* You can't remove system.nfs4_acl: */
+	if (buflen == 0)
+		return -EINVAL;
+	if (!nfs4_server_supports_acls(server, type))
+		return -EOPNOTSUPP;
+	if (npages > ARRAY_SIZE(pages))
+		return -ERANGE;
+	i = nfs4_buf_to_pages_noslab(buf, buflen, arg.acl_pages);
+	if (i < 0)
+		return i;
+	nfs4_inode_make_writeable(inode);
+	ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+
+	/*
+	 * Free each page after tx, so the only ref left is
+	 * held by the network stack
+	 */
+	for (; i > 0; i--)
+		put_page(pages[i-1]);
+
+	/*
+	 * Acl update can result in inode attribute update.
+	 * so mark the attribute cache invalid.
+	 */
+	spin_lock(&inode->i_lock);
+	nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE |
+					     NFS_INO_INVALID_CTIME |
+					     NFS_INO_REVAL_FORCED);
+	spin_unlock(&inode->i_lock);
+	nfs_access_zap_cache(inode);
+	nfs_zap_acl_cache(inode);
+	return ret;
+}
+
+static int nfs4_proc_set_acl(struct inode *inode, const void *buf,
+			     size_t buflen, enum nfs4_acl_type type)
+{
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = __nfs4_proc_set_acl(inode, buf, buflen, type);
+		trace_nfs4_set_acl(inode, err);
+		if (err == -NFS4ERR_BADOWNER || err == -NFS4ERR_BADNAME) {
+			/*
+			 * no need to retry since the kernel
+			 * isn't involved in encoding the ACEs.
+			 */
+			err = -EINVAL;
+			break;
+		}
+		err = nfs4_handle_exception(NFS_SERVER(inode), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+static int _nfs4_get_security_label(struct inode *inode, void *buf,
+					size_t buflen)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs4_label label = {0, 0, buflen, buf};
+
+	u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
+	struct nfs_fattr fattr = {
+		.label = &label,
+	};
+	struct nfs4_getattr_arg arg = {
+		.fh		= NFS_FH(inode),
+		.bitmask	= bitmask,
+	};
+	struct nfs4_getattr_res res = {
+		.fattr		= &fattr,
+		.server		= server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_GETATTR],
+		.rpc_argp	= &arg,
+		.rpc_resp	= &res,
+	};
+	int ret;
+
+	nfs_fattr_init(&fattr);
+
+	ret = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 0);
+	if (ret)
+		return ret;
+	if (!(fattr.valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL))
+		return -ENOENT;
+	return label.len;
+}
+
+static int nfs4_get_security_label(struct inode *inode, void *buf,
+					size_t buflen)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+
+	if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
+		return -EOPNOTSUPP;
+
+	do {
+		err = _nfs4_get_security_label(inode, buf, buflen);
+		trace_nfs4_get_security_label(inode, err);
+		err = nfs4_handle_exception(NFS_SERVER(inode), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_do_set_security_label(struct inode *inode,
+		struct nfs4_label *ilabel,
+		struct nfs_fattr *fattr)
+{
+
+	struct iattr sattr = {0};
+	struct nfs_server *server = NFS_SERVER(inode);
+	const u32 bitmask[3] = { 0, 0, FATTR4_WORD2_SECURITY_LABEL };
+	struct nfs_setattrargs arg = {
+		.fh		= NFS_FH(inode),
+		.iap		= &sattr,
+		.server		= server,
+		.bitmask	= bitmask,
+		.label		= ilabel,
+	};
+	struct nfs_setattrres res = {
+		.fattr		= fattr,
+		.server		= server,
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_SETATTR],
+		.rpc_argp	= &arg,
+		.rpc_resp	= &res,
+	};
+	int status;
+
+	nfs4_stateid_copy(&arg.stateid, &zero_stateid);
+
+	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+	if (status)
+		dprintk("%s failed: %d\n", __func__, status);
+
+	return status;
+}
+
+static int nfs4_do_set_security_label(struct inode *inode,
+		struct nfs4_label *ilabel,
+		struct nfs_fattr *fattr)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = _nfs4_do_set_security_label(inode, ilabel, fattr);
+		trace_nfs4_set_security_label(inode, err);
+		err = nfs4_handle_exception(NFS_SERVER(inode), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int
+nfs4_set_security_label(struct inode *inode, const void *buf, size_t buflen)
+{
+	struct nfs4_label ilabel = {0, 0, buflen, (char *)buf };
+	struct nfs_fattr *fattr;
+	int status;
+
+	if (!nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL))
+		return -EOPNOTSUPP;
+
+	fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
+	if (fattr == NULL)
+		return -ENOMEM;
+
+	status = nfs4_do_set_security_label(inode, &ilabel, fattr);
+	if (status == 0)
+		nfs_setsecurity(inode, fattr);
+
+	return status;
+}
+#endif	/* CONFIG_NFS_V4_SECURITY_LABEL */
+
+
+static void nfs4_init_boot_verifier(const struct nfs_client *clp,
+				    nfs4_verifier *bootverf)
+{
+	__be32 verf[2];
+
+	if (test_bit(NFS4CLNT_PURGE_STATE, &clp->cl_state)) {
+		/* An impossible timestamp guarantees this value
+		 * will never match a generated boot time. */
+		verf[0] = cpu_to_be32(U32_MAX);
+		verf[1] = cpu_to_be32(U32_MAX);
+	} else {
+		struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
+		u64 ns = ktime_to_ns(nn->boot_time);
+
+		verf[0] = cpu_to_be32(ns >> 32);
+		verf[1] = cpu_to_be32(ns);
+	}
+	memcpy(bootverf->data, verf, sizeof(bootverf->data));
+}
+
+static size_t
+nfs4_get_uniquifier(struct nfs_client *clp, char *buf, size_t buflen)
+{
+	struct nfs_net *nn = net_generic(clp->cl_net, nfs_net_id);
+	struct nfs_netns_client *nn_clp = nn->nfs_client;
+	const char *id;
+
+	buf[0] = '\0';
+
+	if (nn_clp) {
+		rcu_read_lock();
+		id = rcu_dereference(nn_clp->identifier);
+		if (id)
+			strscpy(buf, id, buflen);
+		rcu_read_unlock();
+	}
+
+	if (nfs4_client_id_uniquifier[0] != '\0' && buf[0] == '\0')
+		strscpy(buf, nfs4_client_id_uniquifier, buflen);
+
+	return strlen(buf);
+}
+
+static int
+nfs4_init_nonuniform_client_string(struct nfs_client *clp)
+{
+	char buf[NFS4_CLIENT_ID_UNIQ_LEN];
+	size_t buflen;
+	size_t len;
+	char *str;
+
+	if (clp->cl_owner_id != NULL)
+		return 0;
+
+	rcu_read_lock();
+	len = 14 +
+		strlen(clp->cl_rpcclient->cl_nodename) +
+		1 +
+		strlen(rpc_peeraddr2str(clp->cl_rpcclient, RPC_DISPLAY_ADDR)) +
+		1;
+	rcu_read_unlock();
+
+	buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
+	if (buflen)
+		len += buflen + 1;
+
+	if (len > NFS4_OPAQUE_LIMIT + 1)
+		return -EINVAL;
+
+	/*
+	 * Since this string is allocated at mount time, and held until the
+	 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
+	 * about a memory-reclaim deadlock.
+	 */
+	str = kmalloc(len, GFP_KERNEL);
+	if (!str)
+		return -ENOMEM;
+
+	rcu_read_lock();
+	if (buflen)
+		scnprintf(str, len, "Linux NFSv4.0 %s/%s/%s",
+			  clp->cl_rpcclient->cl_nodename, buf,
+			  rpc_peeraddr2str(clp->cl_rpcclient,
+					   RPC_DISPLAY_ADDR));
+	else
+		scnprintf(str, len, "Linux NFSv4.0 %s/%s",
+			  clp->cl_rpcclient->cl_nodename,
+			  rpc_peeraddr2str(clp->cl_rpcclient,
+					   RPC_DISPLAY_ADDR));
+	rcu_read_unlock();
+
+	clp->cl_owner_id = str;
+	return 0;
+}
+
+static int
+nfs4_init_uniform_client_string(struct nfs_client *clp)
+{
+	char buf[NFS4_CLIENT_ID_UNIQ_LEN];
+	size_t buflen;
+	size_t len;
+	char *str;
+
+	if (clp->cl_owner_id != NULL)
+		return 0;
+
+	len = 10 + 10 + 1 + 10 + 1 +
+		strlen(clp->cl_rpcclient->cl_nodename) + 1;
+
+	buflen = nfs4_get_uniquifier(clp, buf, sizeof(buf));
+	if (buflen)
+		len += buflen + 1;
+
+	if (len > NFS4_OPAQUE_LIMIT + 1)
+		return -EINVAL;
+
+	/*
+	 * Since this string is allocated at mount time, and held until the
+	 * nfs_client is destroyed, we can use GFP_KERNEL here w/o worrying
+	 * about a memory-reclaim deadlock.
+	 */
+	str = kmalloc(len, GFP_KERNEL);
+	if (!str)
+		return -ENOMEM;
+
+	if (buflen)
+		scnprintf(str, len, "Linux NFSv%u.%u %s/%s",
+			  clp->rpc_ops->version, clp->cl_minorversion,
+			  buf, clp->cl_rpcclient->cl_nodename);
+	else
+		scnprintf(str, len, "Linux NFSv%u.%u %s",
+			  clp->rpc_ops->version, clp->cl_minorversion,
+			  clp->cl_rpcclient->cl_nodename);
+	clp->cl_owner_id = str;
+	return 0;
+}
+
+/*
+ * nfs4_callback_up_net() starts only "tcp" and "tcp6" callback
+ * services.  Advertise one based on the address family of the
+ * clientaddr.
+ */
+static unsigned int
+nfs4_init_callback_netid(const struct nfs_client *clp, char *buf, size_t len)
+{
+	if (strchr(clp->cl_ipaddr, ':') != NULL)
+		return scnprintf(buf, len, "tcp6");
+	else
+		return scnprintf(buf, len, "tcp");
+}
+
+static void nfs4_setclientid_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_setclientid *sc = calldata;
+
+	if (task->tk_status == 0)
+		sc->sc_cred = get_rpccred(task->tk_rqstp->rq_cred);
+}
+
+static const struct rpc_call_ops nfs4_setclientid_ops = {
+	.rpc_call_done = nfs4_setclientid_done,
+};
+
+/**
+ * nfs4_proc_setclientid - Negotiate client ID
+ * @clp: state data structure
+ * @program: RPC program for NFSv4 callback service
+ * @port: IP port number for NFS4 callback service
+ * @cred: credential to use for this call
+ * @res: where to place the result
+ *
+ * Returns zero, a negative errno, or a negative NFS4ERR status code.
+ */
+int nfs4_proc_setclientid(struct nfs_client *clp, u32 program,
+		unsigned short port, const struct cred *cred,
+		struct nfs4_setclientid_res *res)
+{
+	nfs4_verifier sc_verifier;
+	struct nfs4_setclientid setclientid = {
+		.sc_verifier = &sc_verifier,
+		.sc_prog = program,
+		.sc_clnt = clp,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID],
+		.rpc_argp = &setclientid,
+		.rpc_resp = res,
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_setclientid_ops,
+		.callback_data = &setclientid,
+		.flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
+	};
+	unsigned long now = jiffies;
+	int status;
+
+	/* nfs_client_id4 */
+	nfs4_init_boot_verifier(clp, &sc_verifier);
+
+	if (test_bit(NFS_CS_MIGRATION, &clp->cl_flags))
+		status = nfs4_init_uniform_client_string(clp);
+	else
+		status = nfs4_init_nonuniform_client_string(clp);
+
+	if (status)
+		goto out;
+
+	/* cb_client4 */
+	setclientid.sc_netid_len =
+				nfs4_init_callback_netid(clp,
+						setclientid.sc_netid,
+						sizeof(setclientid.sc_netid));
+	setclientid.sc_uaddr_len = scnprintf(setclientid.sc_uaddr,
+				sizeof(setclientid.sc_uaddr), "%s.%u.%u",
+				clp->cl_ipaddr, port >> 8, port & 255);
+
+	dprintk("NFS call  setclientid auth=%s, '%s'\n",
+		clp->cl_rpcclient->cl_auth->au_ops->au_name,
+		clp->cl_owner_id);
+
+	status = nfs4_call_sync_custom(&task_setup_data);
+	if (setclientid.sc_cred) {
+		kfree(clp->cl_acceptor);
+		clp->cl_acceptor = rpcauth_stringify_acceptor(setclientid.sc_cred);
+		put_rpccred(setclientid.sc_cred);
+	}
+
+	if (status == 0)
+		do_renew_lease(clp, now);
+out:
+	trace_nfs4_setclientid(clp, status);
+	dprintk("NFS reply setclientid: %d\n", status);
+	return status;
+}
+
+/**
+ * nfs4_proc_setclientid_confirm - Confirm client ID
+ * @clp: state data structure
+ * @arg: result of a previous SETCLIENTID
+ * @cred: credential to use for this call
+ *
+ * Returns zero, a negative errno, or a negative NFS4ERR status code.
+ */
+int nfs4_proc_setclientid_confirm(struct nfs_client *clp,
+		struct nfs4_setclientid_res *arg,
+		const struct cred *cred)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SETCLIENTID_CONFIRM],
+		.rpc_argp = arg,
+		.rpc_cred = cred,
+	};
+	int status;
+
+	dprintk("NFS call  setclientid_confirm auth=%s, (client ID %llx)\n",
+		clp->cl_rpcclient->cl_auth->au_ops->au_name,
+		clp->cl_clientid);
+	status = rpc_call_sync(clp->cl_rpcclient, &msg,
+			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
+	trace_nfs4_setclientid_confirm(clp, status);
+	dprintk("NFS reply setclientid_confirm: %d\n", status);
+	return status;
+}
+
+struct nfs4_delegreturndata {
+	struct nfs4_delegreturnargs args;
+	struct nfs4_delegreturnres res;
+	struct nfs_fh fh;
+	nfs4_stateid stateid;
+	unsigned long timestamp;
+	struct {
+		struct nfs4_layoutreturn_args arg;
+		struct nfs4_layoutreturn_res res;
+		struct nfs4_xdr_opaque_data ld_private;
+		u32 roc_barrier;
+		bool roc;
+	} lr;
+	struct nfs_fattr fattr;
+	int rpc_status;
+	struct inode *inode;
+};
+
+static void nfs4_delegreturn_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_delegreturndata *data = calldata;
+	struct nfs4_exception exception = {
+		.inode = data->inode,
+		.stateid = &data->stateid,
+		.task_is_privileged = data->args.seq_args.sa_privileged,
+	};
+
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return;
+
+	trace_nfs4_delegreturn_exit(&data->args, &data->res, task->tk_status);
+
+	/* Handle Layoutreturn errors */
+	if (pnfs_roc_done(task, &data->args.lr_args, &data->res.lr_res,
+			  &data->res.lr_ret) == -EAGAIN)
+		goto out_restart;
+
+	switch (task->tk_status) {
+	case 0:
+		renew_lease(data->res.server, data->timestamp);
+		break;
+	case -NFS4ERR_ADMIN_REVOKED:
+	case -NFS4ERR_DELEG_REVOKED:
+	case -NFS4ERR_EXPIRED:
+		nfs4_free_revoked_stateid(data->res.server,
+				data->args.stateid,
+				task->tk_msg.rpc_cred);
+		fallthrough;
+	case -NFS4ERR_BAD_STATEID:
+	case -NFS4ERR_STALE_STATEID:
+	case -ETIMEDOUT:
+		task->tk_status = 0;
+		break;
+	case -NFS4ERR_OLD_STATEID:
+		if (!nfs4_refresh_delegation_stateid(&data->stateid, data->inode))
+			nfs4_stateid_seqid_inc(&data->stateid);
+		if (data->args.bitmask) {
+			data->args.bitmask = NULL;
+			data->res.fattr = NULL;
+		}
+		goto out_restart;
+	case -NFS4ERR_ACCESS:
+		if (data->args.bitmask) {
+			data->args.bitmask = NULL;
+			data->res.fattr = NULL;
+			goto out_restart;
+		}
+		fallthrough;
+	default:
+		task->tk_status = nfs4_async_handle_exception(task,
+				data->res.server, task->tk_status,
+				&exception);
+		if (exception.retry)
+			goto out_restart;
+	}
+	nfs_delegation_mark_returned(data->inode, data->args.stateid);
+	data->rpc_status = task->tk_status;
+	return;
+out_restart:
+	task->tk_status = 0;
+	rpc_restart_call_prepare(task);
+}
+
+static void nfs4_delegreturn_release(void *calldata)
+{
+	struct nfs4_delegreturndata *data = calldata;
+	struct inode *inode = data->inode;
+
+	if (data->lr.roc)
+		pnfs_roc_release(&data->lr.arg, &data->lr.res,
+				 data->res.lr_ret);
+	if (inode) {
+		nfs4_fattr_set_prechange(&data->fattr,
+					 inode_peek_iversion_raw(inode));
+		nfs_refresh_inode(inode, &data->fattr);
+		nfs_iput_and_deactive(inode);
+	}
+	kfree(calldata);
+}
+
+static void nfs4_delegreturn_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_delegreturndata *d_data;
+	struct pnfs_layout_hdr *lo;
+
+	d_data = data;
+
+	if (!d_data->lr.roc && nfs4_wait_on_layoutreturn(d_data->inode, task)) {
+		nfs4_sequence_done(task, &d_data->res.seq_res);
+		return;
+	}
+
+	lo = d_data->args.lr_args ? d_data->args.lr_args->layout : NULL;
+	if (lo && !pnfs_layout_is_valid(lo)) {
+		d_data->args.lr_args = NULL;
+		d_data->res.lr_res = NULL;
+	}
+
+	nfs4_setup_sequence(d_data->res.server->nfs_client,
+			&d_data->args.seq_args,
+			&d_data->res.seq_res,
+			task);
+}
+
+static const struct rpc_call_ops nfs4_delegreturn_ops = {
+	.rpc_call_prepare = nfs4_delegreturn_prepare,
+	.rpc_call_done = nfs4_delegreturn_done,
+	.rpc_release = nfs4_delegreturn_release,
+};
+
+static int _nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
+{
+	struct nfs4_delegreturndata *data;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DELEGRETURN],
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_delegreturn_ops,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT,
+	};
+	int status = 0;
+
+	if (nfs_server_capable(inode, NFS_CAP_MOVEABLE))
+		task_setup_data.flags |= RPC_TASK_MOVEABLE;
+
+	data = kzalloc(sizeof(*data), GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+
+	nfs4_state_protect(server->nfs_client,
+			NFS_SP4_MACH_CRED_CLEANUP,
+			&task_setup_data.rpc_client, &msg);
+
+	data->args.fhandle = &data->fh;
+	data->args.stateid = &data->stateid;
+	nfs4_bitmask_set(data->args.bitmask_store,
+			 server->cache_consistency_bitmask, inode, 0);
+	data->args.bitmask = data->args.bitmask_store;
+	nfs_copy_fh(&data->fh, NFS_FH(inode));
+	nfs4_stateid_copy(&data->stateid, stateid);
+	data->res.fattr = &data->fattr;
+	data->res.server = server;
+	data->res.lr_ret = -NFS4ERR_NOMATCHING_LAYOUT;
+	data->lr.arg.ld_private = &data->lr.ld_private;
+	nfs_fattr_init(data->res.fattr);
+	data->timestamp = jiffies;
+	data->rpc_status = 0;
+	data->inode = nfs_igrab_and_active(inode);
+	if (data->inode || issync) {
+		data->lr.roc = pnfs_roc(inode, &data->lr.arg, &data->lr.res,
+					cred);
+		if (data->lr.roc) {
+			data->args.lr_args = &data->lr.arg;
+			data->res.lr_res = &data->lr.res;
+		}
+	}
+
+	if (!data->inode)
+		nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
+				   1);
+	else
+		nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1,
+				   0);
+	task_setup_data.callback_data = data;
+	msg.rpc_argp = &data->args;
+	msg.rpc_resp = &data->res;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	if (!issync)
+		goto out;
+	status = rpc_wait_for_completion_task(task);
+	if (status != 0)
+		goto out;
+	status = data->rpc_status;
+out:
+	rpc_put_task(task);
+	return status;
+}
+
+int nfs4_proc_delegreturn(struct inode *inode, const struct cred *cred, const nfs4_stateid *stateid, int issync)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs4_exception exception = { };
+	int err;
+	do {
+		err = _nfs4_proc_delegreturn(inode, cred, stateid, issync);
+		trace_nfs4_delegreturn(inode, stateid, err);
+		switch (err) {
+			case -NFS4ERR_STALE_STATEID:
+			case -NFS4ERR_EXPIRED:
+			case 0:
+				return 0;
+		}
+		err = nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int _nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct inode *inode = state->inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_client *clp = server->nfs_client;
+	struct nfs_lockt_args arg = {
+		.fh = NFS_FH(inode),
+		.fl = request,
+	};
+	struct nfs_lockt_res res = {
+		.denied = request,
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_LOCKT],
+		.rpc_argp	= &arg,
+		.rpc_resp	= &res,
+		.rpc_cred	= state->owner->so_cred,
+	};
+	struct nfs4_lock_state *lsp;
+	int status;
+
+	arg.lock_owner.clientid = clp->cl_clientid;
+	status = nfs4_set_lock_state(state, request);
+	if (status != 0)
+		goto out;
+	lsp = request->fl_u.nfs4_fl.owner;
+	arg.lock_owner.id = lsp->ls_seqid.owner_id;
+	arg.lock_owner.s_dev = server->s_dev;
+	status = nfs4_call_sync(server->client, server, &msg, &arg.seq_args, &res.seq_res, 1);
+	switch (status) {
+		case 0:
+			request->fl_type = F_UNLCK;
+			break;
+		case -NFS4ERR_DENIED:
+			status = 0;
+	}
+	request->fl_ops->fl_release_private(request);
+	request->fl_ops = NULL;
+out:
+	return status;
+}
+
+static int nfs4_proc_getlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+
+	do {
+		err = _nfs4_proc_getlk(state, cmd, request);
+		trace_nfs4_get_lock(request, state, cmd, err);
+		err = nfs4_handle_exception(NFS_SERVER(state->inode), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/*
+ * Update the seqid of a lock stateid after receiving
+ * NFS4ERR_OLD_STATEID
+ */
+static bool nfs4_refresh_lock_old_stateid(nfs4_stateid *dst,
+		struct nfs4_lock_state *lsp)
+{
+	struct nfs4_state *state = lsp->ls_state;
+	bool ret = false;
+
+	spin_lock(&state->state_lock);
+	if (!nfs4_stateid_match_other(dst, &lsp->ls_stateid))
+		goto out;
+	if (!nfs4_stateid_is_newer(&lsp->ls_stateid, dst))
+		nfs4_stateid_seqid_inc(dst);
+	else
+		dst->seqid = lsp->ls_stateid.seqid;
+	ret = true;
+out:
+	spin_unlock(&state->state_lock);
+	return ret;
+}
+
+static bool nfs4_sync_lock_stateid(nfs4_stateid *dst,
+		struct nfs4_lock_state *lsp)
+{
+	struct nfs4_state *state = lsp->ls_state;
+	bool ret;
+
+	spin_lock(&state->state_lock);
+	ret = !nfs4_stateid_match_other(dst, &lsp->ls_stateid);
+	nfs4_stateid_copy(dst, &lsp->ls_stateid);
+	spin_unlock(&state->state_lock);
+	return ret;
+}
+
+struct nfs4_unlockdata {
+	struct nfs_locku_args arg;
+	struct nfs_locku_res res;
+	struct nfs4_lock_state *lsp;
+	struct nfs_open_context *ctx;
+	struct nfs_lock_context *l_ctx;
+	struct file_lock fl;
+	struct nfs_server *server;
+	unsigned long timestamp;
+};
+
+static struct nfs4_unlockdata *nfs4_alloc_unlockdata(struct file_lock *fl,
+		struct nfs_open_context *ctx,
+		struct nfs4_lock_state *lsp,
+		struct nfs_seqid *seqid)
+{
+	struct nfs4_unlockdata *p;
+	struct nfs4_state *state = lsp->ls_state;
+	struct inode *inode = state->inode;
+
+	p = kzalloc(sizeof(*p), GFP_KERNEL);
+	if (p == NULL)
+		return NULL;
+	p->arg.fh = NFS_FH(inode);
+	p->arg.fl = &p->fl;
+	p->arg.seqid = seqid;
+	p->res.seqid = seqid;
+	p->lsp = lsp;
+	/* Ensure we don't close file until we're done freeing locks! */
+	p->ctx = get_nfs_open_context(ctx);
+	p->l_ctx = nfs_get_lock_context(ctx);
+	locks_init_lock(&p->fl);
+	locks_copy_lock(&p->fl, fl);
+	p->server = NFS_SERVER(inode);
+	spin_lock(&state->state_lock);
+	nfs4_stateid_copy(&p->arg.stateid, &lsp->ls_stateid);
+	spin_unlock(&state->state_lock);
+	return p;
+}
+
+static void nfs4_locku_release_calldata(void *data)
+{
+	struct nfs4_unlockdata *calldata = data;
+	nfs_free_seqid(calldata->arg.seqid);
+	nfs4_put_lock_state(calldata->lsp);
+	nfs_put_lock_context(calldata->l_ctx);
+	put_nfs_open_context(calldata->ctx);
+	kfree(calldata);
+}
+
+static void nfs4_locku_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_unlockdata *calldata = data;
+	struct nfs4_exception exception = {
+		.inode = calldata->lsp->ls_state->inode,
+		.stateid = &calldata->arg.stateid,
+	};
+
+	if (!nfs4_sequence_done(task, &calldata->res.seq_res))
+		return;
+	switch (task->tk_status) {
+		case 0:
+			renew_lease(calldata->server, calldata->timestamp);
+			locks_lock_inode_wait(calldata->lsp->ls_state->inode, &calldata->fl);
+			if (nfs4_update_lock_stateid(calldata->lsp,
+					&calldata->res.stateid))
+				break;
+			fallthrough;
+		case -NFS4ERR_ADMIN_REVOKED:
+		case -NFS4ERR_EXPIRED:
+			nfs4_free_revoked_stateid(calldata->server,
+					&calldata->arg.stateid,
+					task->tk_msg.rpc_cred);
+			fallthrough;
+		case -NFS4ERR_BAD_STATEID:
+		case -NFS4ERR_STALE_STATEID:
+			if (nfs4_sync_lock_stateid(&calldata->arg.stateid,
+						calldata->lsp))
+				rpc_restart_call_prepare(task);
+			break;
+		case -NFS4ERR_OLD_STATEID:
+			if (nfs4_refresh_lock_old_stateid(&calldata->arg.stateid,
+						calldata->lsp))
+				rpc_restart_call_prepare(task);
+			break;
+		default:
+			task->tk_status = nfs4_async_handle_exception(task,
+					calldata->server, task->tk_status,
+					&exception);
+			if (exception.retry)
+				rpc_restart_call_prepare(task);
+	}
+	nfs_release_seqid(calldata->arg.seqid);
+}
+
+static void nfs4_locku_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_unlockdata *calldata = data;
+
+	if (test_bit(NFS_CONTEXT_UNLOCK, &calldata->l_ctx->open_context->flags) &&
+		nfs_async_iocounter_wait(task, calldata->l_ctx))
+		return;
+
+	if (nfs_wait_on_sequence(calldata->arg.seqid, task) != 0)
+		goto out_wait;
+	if (test_bit(NFS_LOCK_INITIALIZED, &calldata->lsp->ls_flags) == 0) {
+		/* Note: exit _without_ running nfs4_locku_done */
+		goto out_no_action;
+	}
+	calldata->timestamp = jiffies;
+	if (nfs4_setup_sequence(calldata->server->nfs_client,
+				&calldata->arg.seq_args,
+				&calldata->res.seq_res,
+				task) != 0)
+		nfs_release_seqid(calldata->arg.seqid);
+	return;
+out_no_action:
+	task->tk_action = NULL;
+out_wait:
+	nfs4_sequence_done(task, &calldata->res.seq_res);
+}
+
+static const struct rpc_call_ops nfs4_locku_ops = {
+	.rpc_call_prepare = nfs4_locku_prepare,
+	.rpc_call_done = nfs4_locku_done,
+	.rpc_release = nfs4_locku_release_calldata,
+};
+
+static struct rpc_task *nfs4_do_unlck(struct file_lock *fl,
+		struct nfs_open_context *ctx,
+		struct nfs4_lock_state *lsp,
+		struct nfs_seqid *seqid)
+{
+	struct nfs4_unlockdata *data;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCKU],
+		.rpc_cred = ctx->cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = NFS_CLIENT(lsp->ls_state->inode),
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_locku_ops,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC,
+	};
+
+	if (nfs_server_capable(lsp->ls_state->inode, NFS_CAP_MOVEABLE))
+		task_setup_data.flags |= RPC_TASK_MOVEABLE;
+
+	nfs4_state_protect(NFS_SERVER(lsp->ls_state->inode)->nfs_client,
+		NFS_SP4_MACH_CRED_CLEANUP, &task_setup_data.rpc_client, &msg);
+
+	/* Ensure this is an unlock - when canceling a lock, the
+	 * canceled lock is passed in, and it won't be an unlock.
+	 */
+	fl->fl_type = F_UNLCK;
+	if (fl->fl_flags & FL_CLOSE)
+		set_bit(NFS_CONTEXT_UNLOCK, &ctx->flags);
+
+	data = nfs4_alloc_unlockdata(fl, ctx, lsp, seqid);
+	if (data == NULL) {
+		nfs_free_seqid(seqid);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1, 0);
+	msg.rpc_argp = &data->arg;
+	msg.rpc_resp = &data->res;
+	task_setup_data.callback_data = data;
+	return rpc_run_task(&task_setup_data);
+}
+
+static int nfs4_proc_unlck(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct inode *inode = state->inode;
+	struct nfs4_state_owner *sp = state->owner;
+	struct nfs_inode *nfsi = NFS_I(inode);
+	struct nfs_seqid *seqid;
+	struct nfs4_lock_state *lsp;
+	struct rpc_task *task;
+	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
+	int status = 0;
+	unsigned char fl_flags = request->fl_flags;
+
+	status = nfs4_set_lock_state(state, request);
+	/* Unlock _before_ we do the RPC call */
+	request->fl_flags |= FL_EXISTS;
+	/* Exclude nfs_delegation_claim_locks() */
+	mutex_lock(&sp->so_delegreturn_mutex);
+	/* Exclude nfs4_reclaim_open_stateid() - note nesting! */
+	down_read(&nfsi->rwsem);
+	if (locks_lock_inode_wait(inode, request) == -ENOENT) {
+		up_read(&nfsi->rwsem);
+		mutex_unlock(&sp->so_delegreturn_mutex);
+		goto out;
+	}
+	lsp = request->fl_u.nfs4_fl.owner;
+	set_bit(NFS_LOCK_UNLOCKING, &lsp->ls_flags);
+	up_read(&nfsi->rwsem);
+	mutex_unlock(&sp->so_delegreturn_mutex);
+	if (status != 0)
+		goto out;
+	/* Is this a delegated lock? */
+	if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) == 0)
+		goto out;
+	alloc_seqid = NFS_SERVER(inode)->nfs_client->cl_mvops->alloc_seqid;
+	seqid = alloc_seqid(&lsp->ls_seqid, GFP_KERNEL);
+	status = -ENOMEM;
+	if (IS_ERR(seqid))
+		goto out;
+	task = nfs4_do_unlck(request, nfs_file_open_context(request->fl_file), lsp, seqid);
+	status = PTR_ERR(task);
+	if (IS_ERR(task))
+		goto out;
+	status = rpc_wait_for_completion_task(task);
+	rpc_put_task(task);
+out:
+	request->fl_flags = fl_flags;
+	trace_nfs4_unlock(request, state, F_SETLK, status);
+	return status;
+}
+
+struct nfs4_lockdata {
+	struct nfs_lock_args arg;
+	struct nfs_lock_res res;
+	struct nfs4_lock_state *lsp;
+	struct nfs_open_context *ctx;
+	struct file_lock fl;
+	unsigned long timestamp;
+	int rpc_status;
+	int cancelled;
+	struct nfs_server *server;
+};
+
+static struct nfs4_lockdata *nfs4_alloc_lockdata(struct file_lock *fl,
+		struct nfs_open_context *ctx, struct nfs4_lock_state *lsp,
+		gfp_t gfp_mask)
+{
+	struct nfs4_lockdata *p;
+	struct inode *inode = lsp->ls_state->inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_seqid *(*alloc_seqid)(struct nfs_seqid_counter *, gfp_t);
+
+	p = kzalloc(sizeof(*p), gfp_mask);
+	if (p == NULL)
+		return NULL;
+
+	p->arg.fh = NFS_FH(inode);
+	p->arg.fl = &p->fl;
+	p->arg.open_seqid = nfs_alloc_seqid(&lsp->ls_state->owner->so_seqid, gfp_mask);
+	if (IS_ERR(p->arg.open_seqid))
+		goto out_free;
+	alloc_seqid = server->nfs_client->cl_mvops->alloc_seqid;
+	p->arg.lock_seqid = alloc_seqid(&lsp->ls_seqid, gfp_mask);
+	if (IS_ERR(p->arg.lock_seqid))
+		goto out_free_seqid;
+	p->arg.lock_owner.clientid = server->nfs_client->cl_clientid;
+	p->arg.lock_owner.id = lsp->ls_seqid.owner_id;
+	p->arg.lock_owner.s_dev = server->s_dev;
+	p->res.lock_seqid = p->arg.lock_seqid;
+	p->lsp = lsp;
+	p->server = server;
+	p->ctx = get_nfs_open_context(ctx);
+	locks_init_lock(&p->fl);
+	locks_copy_lock(&p->fl, fl);
+	return p;
+out_free_seqid:
+	nfs_free_seqid(p->arg.open_seqid);
+out_free:
+	kfree(p);
+	return NULL;
+}
+
+static void nfs4_lock_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_lockdata *data = calldata;
+	struct nfs4_state *state = data->lsp->ls_state;
+
+	if (nfs_wait_on_sequence(data->arg.lock_seqid, task) != 0)
+		goto out_wait;
+	/* Do we need to do an open_to_lock_owner? */
+	if (!test_bit(NFS_LOCK_INITIALIZED, &data->lsp->ls_flags)) {
+		if (nfs_wait_on_sequence(data->arg.open_seqid, task) != 0) {
+			goto out_release_lock_seqid;
+		}
+		nfs4_stateid_copy(&data->arg.open_stateid,
+				&state->open_stateid);
+		data->arg.new_lock_owner = 1;
+		data->res.open_seqid = data->arg.open_seqid;
+	} else {
+		data->arg.new_lock_owner = 0;
+		nfs4_stateid_copy(&data->arg.lock_stateid,
+				&data->lsp->ls_stateid);
+	}
+	if (!nfs4_valid_open_stateid(state)) {
+		data->rpc_status = -EBADF;
+		task->tk_action = NULL;
+		goto out_release_open_seqid;
+	}
+	data->timestamp = jiffies;
+	if (nfs4_setup_sequence(data->server->nfs_client,
+				&data->arg.seq_args,
+				&data->res.seq_res,
+				task) == 0)
+		return;
+out_release_open_seqid:
+	nfs_release_seqid(data->arg.open_seqid);
+out_release_lock_seqid:
+	nfs_release_seqid(data->arg.lock_seqid);
+out_wait:
+	nfs4_sequence_done(task, &data->res.seq_res);
+	dprintk("%s: ret = %d\n", __func__, data->rpc_status);
+}
+
+static void nfs4_lock_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_lockdata *data = calldata;
+	struct nfs4_lock_state *lsp = data->lsp;
+
+	if (!nfs4_sequence_done(task, &data->res.seq_res))
+		return;
+
+	data->rpc_status = task->tk_status;
+	switch (task->tk_status) {
+	case 0:
+		renew_lease(NFS_SERVER(d_inode(data->ctx->dentry)),
+				data->timestamp);
+		if (data->arg.new_lock && !data->cancelled) {
+			data->fl.fl_flags &= ~(FL_SLEEP | FL_ACCESS);
+			if (locks_lock_inode_wait(lsp->ls_state->inode, &data->fl) < 0)
+				goto out_restart;
+		}
+		if (data->arg.new_lock_owner != 0) {
+			nfs_confirm_seqid(&lsp->ls_seqid, 0);
+			nfs4_stateid_copy(&lsp->ls_stateid, &data->res.stateid);
+			set_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags);
+		} else if (!nfs4_update_lock_stateid(lsp, &data->res.stateid))
+			goto out_restart;
+		break;
+	case -NFS4ERR_OLD_STATEID:
+		if (data->arg.new_lock_owner != 0 &&
+			nfs4_refresh_open_old_stateid(&data->arg.open_stateid,
+					lsp->ls_state))
+			goto out_restart;
+		if (nfs4_refresh_lock_old_stateid(&data->arg.lock_stateid, lsp))
+			goto out_restart;
+		fallthrough;
+	case -NFS4ERR_BAD_STATEID:
+	case -NFS4ERR_STALE_STATEID:
+	case -NFS4ERR_EXPIRED:
+		if (data->arg.new_lock_owner != 0) {
+			if (!nfs4_stateid_match(&data->arg.open_stateid,
+						&lsp->ls_state->open_stateid))
+				goto out_restart;
+		} else if (!nfs4_stateid_match(&data->arg.lock_stateid,
+						&lsp->ls_stateid))
+				goto out_restart;
+	}
+out_done:
+	dprintk("%s: ret = %d!\n", __func__, data->rpc_status);
+	return;
+out_restart:
+	if (!data->cancelled)
+		rpc_restart_call_prepare(task);
+	goto out_done;
+}
+
+static void nfs4_lock_release(void *calldata)
+{
+	struct nfs4_lockdata *data = calldata;
+
+	nfs_free_seqid(data->arg.open_seqid);
+	if (data->cancelled && data->rpc_status == 0) {
+		struct rpc_task *task;
+		task = nfs4_do_unlck(&data->fl, data->ctx, data->lsp,
+				data->arg.lock_seqid);
+		if (!IS_ERR(task))
+			rpc_put_task_async(task);
+		dprintk("%s: cancelling lock!\n", __func__);
+	} else
+		nfs_free_seqid(data->arg.lock_seqid);
+	nfs4_put_lock_state(data->lsp);
+	put_nfs_open_context(data->ctx);
+	kfree(data);
+}
+
+static const struct rpc_call_ops nfs4_lock_ops = {
+	.rpc_call_prepare = nfs4_lock_prepare,
+	.rpc_call_done = nfs4_lock_done,
+	.rpc_release = nfs4_lock_release,
+};
+
+static void nfs4_handle_setlk_error(struct nfs_server *server, struct nfs4_lock_state *lsp, int new_lock_owner, int error)
+{
+	switch (error) {
+	case -NFS4ERR_ADMIN_REVOKED:
+	case -NFS4ERR_EXPIRED:
+	case -NFS4ERR_BAD_STATEID:
+		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
+		if (new_lock_owner != 0 ||
+		   test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) != 0)
+			nfs4_schedule_stateid_recovery(server, lsp->ls_state);
+		break;
+	case -NFS4ERR_STALE_STATEID:
+		lsp->ls_seqid.flags &= ~NFS_SEQID_CONFIRMED;
+		nfs4_schedule_lease_recovery(server->nfs_client);
+	}
+}
+
+static int _nfs4_do_setlk(struct nfs4_state *state, int cmd, struct file_lock *fl, int recovery_type)
+{
+	struct nfs4_lockdata *data;
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LOCK],
+		.rpc_cred = state->owner->so_cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = NFS_CLIENT(state->inode),
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_lock_ops,
+		.workqueue = nfsiod_workqueue,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF,
+	};
+	int ret;
+
+	if (nfs_server_capable(state->inode, NFS_CAP_MOVEABLE))
+		task_setup_data.flags |= RPC_TASK_MOVEABLE;
+
+	data = nfs4_alloc_lockdata(fl, nfs_file_open_context(fl->fl_file),
+				   fl->fl_u.nfs4_fl.owner, GFP_KERNEL);
+	if (data == NULL)
+		return -ENOMEM;
+	if (IS_SETLKW(cmd))
+		data->arg.block = 1;
+	nfs4_init_sequence(&data->arg.seq_args, &data->res.seq_res, 1,
+				recovery_type > NFS_LOCK_NEW);
+	msg.rpc_argp = &data->arg;
+	msg.rpc_resp = &data->res;
+	task_setup_data.callback_data = data;
+	if (recovery_type > NFS_LOCK_NEW) {
+		if (recovery_type == NFS_LOCK_RECLAIM)
+			data->arg.reclaim = NFS_LOCK_RECLAIM;
+	} else
+		data->arg.new_lock = 1;
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	ret = rpc_wait_for_completion_task(task);
+	if (ret == 0) {
+		ret = data->rpc_status;
+		if (ret)
+			nfs4_handle_setlk_error(data->server, data->lsp,
+					data->arg.new_lock_owner, ret);
+	} else
+		data->cancelled = true;
+	trace_nfs4_set_lock(fl, state, &data->res.stateid, cmd, ret);
+	rpc_put_task(task);
+	dprintk("%s: ret = %d\n", __func__, ret);
+	return ret;
+}
+
+static int nfs4_lock_reclaim(struct nfs4_state *state, struct file_lock *request)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = {
+		.inode = state->inode,
+	};
+	int err;
+
+	do {
+		/* Cache the lock if possible... */
+		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
+			return 0;
+		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_RECLAIM);
+		if (err != -NFS4ERR_DELAY)
+			break;
+		nfs4_handle_exception(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+static int nfs4_lock_expired(struct nfs4_state *state, struct file_lock *request)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs4_exception exception = {
+		.inode = state->inode,
+	};
+	int err;
+
+	err = nfs4_set_lock_state(state, request);
+	if (err != 0)
+		return err;
+	if (!recover_lost_locks) {
+		set_bit(NFS_LOCK_LOST, &request->fl_u.nfs4_fl.owner->ls_flags);
+		return 0;
+	}
+	do {
+		if (test_bit(NFS_DELEGATED_STATE, &state->flags) != 0)
+			return 0;
+		err = _nfs4_do_setlk(state, F_SETLK, request, NFS_LOCK_EXPIRED);
+		switch (err) {
+		default:
+			goto out;
+		case -NFS4ERR_GRACE:
+		case -NFS4ERR_DELAY:
+			nfs4_handle_exception(server, err, &exception);
+			err = 0;
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+#if defined(CONFIG_NFS_V4_1)
+static int nfs41_lock_expired(struct nfs4_state *state, struct file_lock *request)
+{
+	struct nfs4_lock_state *lsp;
+	int status;
+
+	status = nfs4_set_lock_state(state, request);
+	if (status != 0)
+		return status;
+	lsp = request->fl_u.nfs4_fl.owner;
+	if (test_bit(NFS_LOCK_INITIALIZED, &lsp->ls_flags) ||
+	    test_bit(NFS_LOCK_LOST, &lsp->ls_flags))
+		return 0;
+	return nfs4_lock_expired(state, request);
+}
+#endif
+
+static int _nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs_inode *nfsi = NFS_I(state->inode);
+	struct nfs4_state_owner *sp = state->owner;
+	unsigned char fl_flags = request->fl_flags;
+	int status;
+
+	request->fl_flags |= FL_ACCESS;
+	status = locks_lock_inode_wait(state->inode, request);
+	if (status < 0)
+		goto out;
+	mutex_lock(&sp->so_delegreturn_mutex);
+	down_read(&nfsi->rwsem);
+	if (test_bit(NFS_DELEGATED_STATE, &state->flags)) {
+		/* Yes: cache locks! */
+		/* ...but avoid races with delegation recall... */
+		request->fl_flags = fl_flags & ~FL_SLEEP;
+		status = locks_lock_inode_wait(state->inode, request);
+		up_read(&nfsi->rwsem);
+		mutex_unlock(&sp->so_delegreturn_mutex);
+		goto out;
+	}
+	up_read(&nfsi->rwsem);
+	mutex_unlock(&sp->so_delegreturn_mutex);
+	status = _nfs4_do_setlk(state, cmd, request, NFS_LOCK_NEW);
+out:
+	request->fl_flags = fl_flags;
+	return status;
+}
+
+static int nfs4_proc_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs4_exception exception = {
+		.state = state,
+		.inode = state->inode,
+		.interruptible = true,
+	};
+	int err;
+
+	do {
+		err = _nfs4_proc_setlk(state, cmd, request);
+		if (err == -NFS4ERR_DENIED)
+			err = -EAGAIN;
+		err = nfs4_handle_exception(NFS_SERVER(state->inode),
+				err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+#define NFS4_LOCK_MINTIMEOUT (1 * HZ)
+#define NFS4_LOCK_MAXTIMEOUT (30 * HZ)
+
+static int
+nfs4_retry_setlk_simple(struct nfs4_state *state, int cmd,
+			struct file_lock *request)
+{
+	int		status = -ERESTARTSYS;
+	unsigned long	timeout = NFS4_LOCK_MINTIMEOUT;
+
+	while(!signalled()) {
+		status = nfs4_proc_setlk(state, cmd, request);
+		if ((status != -EAGAIN) || IS_SETLK(cmd))
+			break;
+		__set_current_state(TASK_INTERRUPTIBLE|TASK_FREEZABLE);
+		schedule_timeout(timeout);
+		timeout *= 2;
+		timeout = min_t(unsigned long, NFS4_LOCK_MAXTIMEOUT, timeout);
+		status = -ERESTARTSYS;
+	}
+	return status;
+}
+
+#ifdef CONFIG_NFS_V4_1
+struct nfs4_lock_waiter {
+	struct inode		*inode;
+	struct nfs_lowner	owner;
+	wait_queue_entry_t	wait;
+};
+
+static int
+nfs4_wake_lock_waiter(wait_queue_entry_t *wait, unsigned int mode, int flags, void *key)
+{
+	struct nfs4_lock_waiter	*waiter	=
+		container_of(wait, struct nfs4_lock_waiter, wait);
+
+	/* NULL key means to wake up everyone */
+	if (key) {
+		struct cb_notify_lock_args	*cbnl = key;
+		struct nfs_lowner		*lowner = &cbnl->cbnl_owner,
+						*wowner = &waiter->owner;
+
+		/* Only wake if the callback was for the same owner. */
+		if (lowner->id != wowner->id || lowner->s_dev != wowner->s_dev)
+			return 0;
+
+		/* Make sure it's for the right inode */
+		if (nfs_compare_fh(NFS_FH(waiter->inode), &cbnl->cbnl_fh))
+			return 0;
+	}
+
+	return woken_wake_function(wait, mode, flags, key);
+}
+
+static int
+nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	struct nfs4_lock_state *lsp = request->fl_u.nfs4_fl.owner;
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	struct nfs_client *clp = server->nfs_client;
+	wait_queue_head_t *q = &clp->cl_lock_waitq;
+	struct nfs4_lock_waiter waiter = {
+		.inode = state->inode,
+		.owner = { .clientid = clp->cl_clientid,
+			   .id = lsp->ls_seqid.owner_id,
+			   .s_dev = server->s_dev },
+	};
+	int status;
+
+	/* Don't bother with waitqueue if we don't expect a callback */
+	if (!test_bit(NFS_STATE_MAY_NOTIFY_LOCK, &state->flags))
+		return nfs4_retry_setlk_simple(state, cmd, request);
+
+	init_wait(&waiter.wait);
+	waiter.wait.func = nfs4_wake_lock_waiter;
+	add_wait_queue(q, &waiter.wait);
+
+	do {
+		status = nfs4_proc_setlk(state, cmd, request);
+		if (status != -EAGAIN || IS_SETLK(cmd))
+			break;
+
+		status = -ERESTARTSYS;
+		wait_woken(&waiter.wait, TASK_INTERRUPTIBLE|TASK_FREEZABLE,
+			   NFS4_LOCK_MAXTIMEOUT);
+	} while (!signalled());
+
+	remove_wait_queue(q, &waiter.wait);
+
+	return status;
+}
+#else /* !CONFIG_NFS_V4_1 */
+static inline int
+nfs4_retry_setlk(struct nfs4_state *state, int cmd, struct file_lock *request)
+{
+	return nfs4_retry_setlk_simple(state, cmd, request);
+}
+#endif
+
+static int
+nfs4_proc_lock(struct file *filp, int cmd, struct file_lock *request)
+{
+	struct nfs_open_context *ctx;
+	struct nfs4_state *state;
+	int status;
+
+	/* verify open state */
+	ctx = nfs_file_open_context(filp);
+	state = ctx->state;
+
+	if (IS_GETLK(cmd)) {
+		if (state != NULL)
+			return nfs4_proc_getlk(state, F_GETLK, request);
+		return 0;
+	}
+
+	if (!(IS_SETLK(cmd) || IS_SETLKW(cmd)))
+		return -EINVAL;
+
+	if (request->fl_type == F_UNLCK) {
+		if (state != NULL)
+			return nfs4_proc_unlck(state, cmd, request);
+		return 0;
+	}
+
+	if (state == NULL)
+		return -ENOLCK;
+
+	if ((request->fl_flags & FL_POSIX) &&
+	    !test_bit(NFS_STATE_POSIX_LOCKS, &state->flags))
+		return -ENOLCK;
+
+	/*
+	 * Don't rely on the VFS having checked the file open mode,
+	 * since it won't do this for flock() locks.
+	 */
+	switch (request->fl_type) {
+	case F_RDLCK:
+		if (!(filp->f_mode & FMODE_READ))
+			return -EBADF;
+		break;
+	case F_WRLCK:
+		if (!(filp->f_mode & FMODE_WRITE))
+			return -EBADF;
+	}
+
+	status = nfs4_set_lock_state(state, request);
+	if (status != 0)
+		return status;
+
+	return nfs4_retry_setlk(state, cmd, request);
+}
+
+static int nfs4_delete_lease(struct file *file, void **priv)
+{
+	return generic_setlease(file, F_UNLCK, NULL, priv);
+}
+
+static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease,
+			  void **priv)
+{
+	struct inode *inode = file_inode(file);
+	fmode_t type = arg == F_RDLCK ? FMODE_READ : FMODE_WRITE;
+	int ret;
+
+	/* No delegation, no lease */
+	if (!nfs4_have_delegation(inode, type))
+		return -EAGAIN;
+	ret = generic_setlease(file, arg, lease, priv);
+	if (ret || nfs4_have_delegation(inode, type))
+		return ret;
+	/* We raced with a delegation return */
+	nfs4_delete_lease(file, priv);
+	return -EAGAIN;
+}
+
+int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease,
+		       void **priv)
+{
+	switch (arg) {
+	case F_RDLCK:
+	case F_WRLCK:
+		return nfs4_add_lease(file, arg, lease, priv);
+	case F_UNLCK:
+		return nfs4_delete_lease(file, priv);
+	default:
+		return -EINVAL;
+	}
+}
+
+int nfs4_lock_delegation_recall(struct file_lock *fl, struct nfs4_state *state, const nfs4_stateid *stateid)
+{
+	struct nfs_server *server = NFS_SERVER(state->inode);
+	int err;
+
+	err = nfs4_set_lock_state(state, fl);
+	if (err != 0)
+		return err;
+	do {
+		err = _nfs4_do_setlk(state, F_SETLK, fl, NFS_LOCK_NEW);
+		if (err != -NFS4ERR_DELAY)
+			break;
+		ssleep(1);
+	} while (err == -NFS4ERR_DELAY);
+	return nfs4_handle_delegation_recall_error(server, state, stateid, fl, err);
+}
+
+struct nfs_release_lockowner_data {
+	struct nfs4_lock_state *lsp;
+	struct nfs_server *server;
+	struct nfs_release_lockowner_args args;
+	struct nfs_release_lockowner_res res;
+	unsigned long timestamp;
+};
+
+static void nfs4_release_lockowner_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs_release_lockowner_data *data = calldata;
+	struct nfs_server *server = data->server;
+	nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
+			   &data->res.seq_res, task);
+	data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
+	data->timestamp = jiffies;
+}
+
+static void nfs4_release_lockowner_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs_release_lockowner_data *data = calldata;
+	struct nfs_server *server = data->server;
+
+	nfs40_sequence_done(task, &data->res.seq_res);
+
+	switch (task->tk_status) {
+	case 0:
+		renew_lease(server, data->timestamp);
+		break;
+	case -NFS4ERR_STALE_CLIENTID:
+	case -NFS4ERR_EXPIRED:
+		nfs4_schedule_lease_recovery(server->nfs_client);
+		break;
+	case -NFS4ERR_LEASE_MOVED:
+	case -NFS4ERR_DELAY:
+		if (nfs4_async_handle_error(task, server,
+					    NULL, NULL) == -EAGAIN)
+			rpc_restart_call_prepare(task);
+	}
+}
+
+static void nfs4_release_lockowner_release(void *calldata)
+{
+	struct nfs_release_lockowner_data *data = calldata;
+	nfs4_free_lock_state(data->server, data->lsp);
+	kfree(calldata);
+}
+
+static const struct rpc_call_ops nfs4_release_lockowner_ops = {
+	.rpc_call_prepare = nfs4_release_lockowner_prepare,
+	.rpc_call_done = nfs4_release_lockowner_done,
+	.rpc_release = nfs4_release_lockowner_release,
+};
+
+static void
+nfs4_release_lockowner(struct nfs_server *server, struct nfs4_lock_state *lsp)
+{
+	struct nfs_release_lockowner_data *data;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RELEASE_LOCKOWNER],
+	};
+
+	if (server->nfs_client->cl_mvops->minor_version != 0)
+		return;
+
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return;
+	data->lsp = lsp;
+	data->server = server;
+	data->args.lock_owner.clientid = server->nfs_client->cl_clientid;
+	data->args.lock_owner.id = lsp->ls_seqid.owner_id;
+	data->args.lock_owner.s_dev = server->s_dev;
+
+	msg.rpc_argp = &data->args;
+	msg.rpc_resp = &data->res;
+	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 0, 0);
+	rpc_call_async(server->client, &msg, 0, &nfs4_release_lockowner_ops, data);
+}
+
+#define XATTR_NAME_NFSV4_ACL "system.nfs4_acl"
+
+static int nfs4_xattr_set_nfs4_acl(const struct xattr_handler *handler,
+				   struct mnt_idmap *idmap,
+				   struct dentry *unused, struct inode *inode,
+				   const char *key, const void *buf,
+				   size_t buflen, int flags)
+{
+	return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_ACL);
+}
+
+static int nfs4_xattr_get_nfs4_acl(const struct xattr_handler *handler,
+				   struct dentry *unused, struct inode *inode,
+				   const char *key, void *buf, size_t buflen)
+{
+	return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_ACL);
+}
+
+static bool nfs4_xattr_list_nfs4_acl(struct dentry *dentry)
+{
+	return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_ACL);
+}
+
+#if defined(CONFIG_NFS_V4_1)
+#define XATTR_NAME_NFSV4_DACL "system.nfs4_dacl"
+
+static int nfs4_xattr_set_nfs4_dacl(const struct xattr_handler *handler,
+				    struct mnt_idmap *idmap,
+				    struct dentry *unused, struct inode *inode,
+				    const char *key, const void *buf,
+				    size_t buflen, int flags)
+{
+	return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_DACL);
+}
+
+static int nfs4_xattr_get_nfs4_dacl(const struct xattr_handler *handler,
+				    struct dentry *unused, struct inode *inode,
+				    const char *key, void *buf, size_t buflen)
+{
+	return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_DACL);
+}
+
+static bool nfs4_xattr_list_nfs4_dacl(struct dentry *dentry)
+{
+	return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_DACL);
+}
+
+#define XATTR_NAME_NFSV4_SACL "system.nfs4_sacl"
+
+static int nfs4_xattr_set_nfs4_sacl(const struct xattr_handler *handler,
+				    struct mnt_idmap *idmap,
+				    struct dentry *unused, struct inode *inode,
+				    const char *key, const void *buf,
+				    size_t buflen, int flags)
+{
+	return nfs4_proc_set_acl(inode, buf, buflen, NFS4ACL_SACL);
+}
+
+static int nfs4_xattr_get_nfs4_sacl(const struct xattr_handler *handler,
+				    struct dentry *unused, struct inode *inode,
+				    const char *key, void *buf, size_t buflen)
+{
+	return nfs4_proc_get_acl(inode, buf, buflen, NFS4ACL_SACL);
+}
+
+static bool nfs4_xattr_list_nfs4_sacl(struct dentry *dentry)
+{
+	return nfs4_server_supports_acls(NFS_SB(dentry->d_sb), NFS4ACL_SACL);
+}
+
+#endif
+
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+
+static int nfs4_xattr_set_nfs4_label(const struct xattr_handler *handler,
+				     struct mnt_idmap *idmap,
+				     struct dentry *unused, struct inode *inode,
+				     const char *key, const void *buf,
+				     size_t buflen, int flags)
+{
+	if (security_ismaclabel(key))
+		return nfs4_set_security_label(inode, buf, buflen);
+
+	return -EOPNOTSUPP;
+}
+
+static int nfs4_xattr_get_nfs4_label(const struct xattr_handler *handler,
+				     struct dentry *unused, struct inode *inode,
+				     const char *key, void *buf, size_t buflen)
+{
+	if (security_ismaclabel(key))
+		return nfs4_get_security_label(inode, buf, buflen);
+	return -EOPNOTSUPP;
+}
+
+static ssize_t
+nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
+{
+	int len = 0;
+
+	if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL)) {
+		len = security_inode_listsecurity(inode, list, list_len);
+		if (len >= 0 && list_len && len > list_len)
+			return -ERANGE;
+	}
+	return len;
+}
+
+static const struct xattr_handler nfs4_xattr_nfs4_label_handler = {
+	.prefix = XATTR_SECURITY_PREFIX,
+	.get	= nfs4_xattr_get_nfs4_label,
+	.set	= nfs4_xattr_set_nfs4_label,
+};
+
+#else
+
+static ssize_t
+nfs4_listxattr_nfs4_label(struct inode *inode, char *list, size_t list_len)
+{
+	return 0;
+}
+
+#endif
+
+#ifdef CONFIG_NFS_V4_2
+static int nfs4_xattr_set_nfs4_user(const struct xattr_handler *handler,
+				    struct mnt_idmap *idmap,
+				    struct dentry *unused, struct inode *inode,
+				    const char *key, const void *buf,
+				    size_t buflen, int flags)
+{
+	u32 mask;
+	int ret;
+
+	if (!nfs_server_capable(inode, NFS_CAP_XATTR))
+		return -EOPNOTSUPP;
+
+	/*
+	 * There is no mapping from the MAY_* flags to the NFS_ACCESS_XA*
+	 * flags right now. Handling of xattr operations use the normal
+	 * file read/write permissions.
+	 *
+	 * Just in case the server has other ideas (which RFC 8276 allows),
+	 * do a cached access check for the XA* flags to possibly avoid
+	 * doing an RPC and getting EACCES back.
+	 */
+	if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
+		if (!(mask & NFS_ACCESS_XAWRITE))
+			return -EACCES;
+	}
+
+	if (buf == NULL) {
+		ret = nfs42_proc_removexattr(inode, key);
+		if (!ret)
+			nfs4_xattr_cache_remove(inode, key);
+	} else {
+		ret = nfs42_proc_setxattr(inode, key, buf, buflen, flags);
+		if (!ret)
+			nfs4_xattr_cache_add(inode, key, buf, NULL, buflen);
+	}
+
+	return ret;
+}
+
+static int nfs4_xattr_get_nfs4_user(const struct xattr_handler *handler,
+				    struct dentry *unused, struct inode *inode,
+				    const char *key, void *buf, size_t buflen)
+{
+	u32 mask;
+	ssize_t ret;
+
+	if (!nfs_server_capable(inode, NFS_CAP_XATTR))
+		return -EOPNOTSUPP;
+
+	if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
+		if (!(mask & NFS_ACCESS_XAREAD))
+			return -EACCES;
+	}
+
+	ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
+	if (ret)
+		return ret;
+
+	ret = nfs4_xattr_cache_get(inode, key, buf, buflen);
+	if (ret >= 0 || (ret < 0 && ret != -ENOENT))
+		return ret;
+
+	ret = nfs42_proc_getxattr(inode, key, buf, buflen);
+
+	return ret;
+}
+
+static ssize_t
+nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
+{
+	u64 cookie;
+	bool eof;
+	ssize_t ret, size;
+	char *buf;
+	size_t buflen;
+	u32 mask;
+
+	if (!nfs_server_capable(inode, NFS_CAP_XATTR))
+		return 0;
+
+	if (!nfs_access_get_cached(inode, current_cred(), &mask, true)) {
+		if (!(mask & NFS_ACCESS_XALIST))
+			return 0;
+	}
+
+	ret = nfs_revalidate_inode(inode, NFS_INO_INVALID_CHANGE);
+	if (ret)
+		return ret;
+
+	ret = nfs4_xattr_cache_list(inode, list, list_len);
+	if (ret >= 0 || (ret < 0 && ret != -ENOENT))
+		return ret;
+
+	cookie = 0;
+	eof = false;
+	buflen = list_len ? list_len : XATTR_LIST_MAX;
+	buf = list_len ? list : NULL;
+	size = 0;
+
+	while (!eof) {
+		ret = nfs42_proc_listxattrs(inode, buf, buflen,
+		    &cookie, &eof);
+		if (ret < 0)
+			return ret;
+
+		if (list_len) {
+			buf += ret;
+			buflen -= ret;
+		}
+		size += ret;
+	}
+
+	if (list_len)
+		nfs4_xattr_cache_set_list(inode, list, size);
+
+	return size;
+}
+
+#else
+
+static ssize_t
+nfs4_listxattr_nfs4_user(struct inode *inode, char *list, size_t list_len)
+{
+	return 0;
+}
+#endif /* CONFIG_NFS_V4_2 */
+
+/*
+ * nfs_fhget will use either the mounted_on_fileid or the fileid
+ */
+static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
+{
+	if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
+	       (fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
+	      (fattr->valid & NFS_ATTR_FATTR_FSID) &&
+	      (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
+		return;
+
+	fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
+		NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
+	fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
+	fattr->nlink = 2;
+}
+
+static int _nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+				   const struct qstr *name,
+				   struct nfs4_fs_locations *fs_locations,
+				   struct page *page)
+{
+	struct nfs_server *server = NFS_SERVER(dir);
+	u32 bitmask[3];
+	struct nfs4_fs_locations_arg args = {
+		.dir_fh = NFS_FH(dir),
+		.name = name,
+		.page = page,
+		.bitmask = bitmask,
+	};
+	struct nfs4_fs_locations_res res = {
+		.fs_locations = fs_locations,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	int status;
+
+	dprintk("%s: start\n", __func__);
+
+	bitmask[0] = nfs4_fattr_bitmap[0] | FATTR4_WORD0_FS_LOCATIONS;
+	bitmask[1] = nfs4_fattr_bitmap[1];
+
+	/* Ask for the fileid of the absent filesystem if mounted_on_fileid
+	 * is not supported */
+	if (NFS_SERVER(dir)->attr_bitmask[1] & FATTR4_WORD1_MOUNTED_ON_FILEID)
+		bitmask[0] &= ~FATTR4_WORD0_FILEID;
+	else
+		bitmask[1] &= ~FATTR4_WORD1_MOUNTED_ON_FILEID;
+
+	nfs_fattr_init(fs_locations->fattr);
+	fs_locations->server = server;
+	fs_locations->nlocations = 0;
+	status = nfs4_call_sync(client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	dprintk("%s: returned status = %d\n", __func__, status);
+	return status;
+}
+
+int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
+			   const struct qstr *name,
+			   struct nfs4_fs_locations *fs_locations,
+			   struct page *page)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs4_proc_fs_locations(client, dir, name,
+				fs_locations, page);
+		trace_nfs4_get_fs_locations(dir, name, err);
+		err = nfs4_handle_exception(NFS_SERVER(dir), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+/*
+ * This operation also signals the server that this client is
+ * performing migration recovery.  The server can stop returning
+ * NFS4ERR_LEASE_MOVED to this client.  A RENEW operation is
+ * appended to this compound to identify the client ID which is
+ * performing recovery.
+ */
+static int _nfs40_proc_get_locations(struct nfs_server *server,
+				     struct nfs_fh *fhandle,
+				     struct nfs4_fs_locations *locations,
+				     struct page *page, const struct cred *cred)
+{
+	struct rpc_clnt *clnt = server->client;
+	u32 bitmask[2] = {
+		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
+	};
+	struct nfs4_fs_locations_arg args = {
+		.clientid	= server->nfs_client->cl_clientid,
+		.fh		= fhandle,
+		.page		= page,
+		.bitmask	= bitmask,
+		.migration	= 1,		/* skip LOOKUP */
+		.renew		= 1,		/* append RENEW */
+	};
+	struct nfs4_fs_locations_res res = {
+		.fs_locations	= locations,
+		.migration	= 1,
+		.renew		= 1,
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
+		.rpc_argp	= &args,
+		.rpc_resp	= &res,
+		.rpc_cred	= cred,
+	};
+	unsigned long now = jiffies;
+	int status;
+
+	nfs_fattr_init(locations->fattr);
+	locations->server = server;
+	locations->nlocations = 0;
+
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
+	status = nfs4_call_sync_sequence(clnt, server, &msg,
+					&args.seq_args, &res.seq_res);
+	if (status)
+		return status;
+
+	renew_lease(server, now);
+	return 0;
+}
+
+#ifdef CONFIG_NFS_V4_1
+
+/*
+ * This operation also signals the server that this client is
+ * performing migration recovery.  The server can stop asserting
+ * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID
+ * performing this operation is identified in the SEQUENCE
+ * operation in this compound.
+ *
+ * When the client supports GETATTR(fs_locations_info), it can
+ * be plumbed in here.
+ */
+static int _nfs41_proc_get_locations(struct nfs_server *server,
+				     struct nfs_fh *fhandle,
+				     struct nfs4_fs_locations *locations,
+				     struct page *page, const struct cred *cred)
+{
+	struct rpc_clnt *clnt = server->client;
+	u32 bitmask[2] = {
+		[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
+	};
+	struct nfs4_fs_locations_arg args = {
+		.fh		= fhandle,
+		.page		= page,
+		.bitmask	= bitmask,
+		.migration	= 1,		/* skip LOOKUP */
+	};
+	struct nfs4_fs_locations_res res = {
+		.fs_locations	= locations,
+		.migration	= 1,
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FS_LOCATIONS],
+		.rpc_argp	= &args,
+		.rpc_resp	= &res,
+		.rpc_cred	= cred,
+	};
+	struct nfs4_call_sync_data data = {
+		.seq_server = server,
+		.seq_args = &args.seq_args,
+		.seq_res = &res.seq_res,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_message = &msg,
+		.callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
+		.callback_data = &data,
+		.flags = RPC_TASK_NO_ROUND_ROBIN,
+	};
+	int status;
+
+	nfs_fattr_init(locations->fattr);
+	locations->server = server;
+	locations->nlocations = 0;
+
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
+	status = nfs4_call_sync_custom(&task_setup_data);
+	if (status == NFS4_OK &&
+	    res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
+		status = -NFS4ERR_LEASE_MOVED;
+	return status;
+}
+
+#endif	/* CONFIG_NFS_V4_1 */
+
+/**
+ * nfs4_proc_get_locations - discover locations for a migrated FSID
+ * @server: pointer to nfs_server to process
+ * @fhandle: pointer to the kernel NFS client file handle
+ * @locations: result of query
+ * @page: buffer
+ * @cred: credential to use for this operation
+ *
+ * Returns NFS4_OK on success, a negative NFS4ERR status code if the
+ * operation failed, or a negative errno if a local error occurred.
+ *
+ * On success, "locations" is filled in, but if the server has
+ * no locations information, NFS_ATTR_FATTR_V4_LOCATIONS is not
+ * asserted.
+ *
+ * -NFS4ERR_LEASE_MOVED is returned if the server still has leases
+ * from this client that require migration recovery.
+ */
+int nfs4_proc_get_locations(struct nfs_server *server,
+			    struct nfs_fh *fhandle,
+			    struct nfs4_fs_locations *locations,
+			    struct page *page, const struct cred *cred)
+{
+	struct nfs_client *clp = server->nfs_client;
+	const struct nfs4_mig_recovery_ops *ops =
+					clp->cl_mvops->mig_recovery_ops;
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int status;
+
+	dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
+		(unsigned long long)server->fsid.major,
+		(unsigned long long)server->fsid.minor,
+		clp->cl_hostname);
+	nfs_display_fhandle(fhandle, __func__);
+
+	do {
+		status = ops->get_locations(server, fhandle, locations, page,
+					    cred);
+		if (status != -NFS4ERR_DELAY)
+			break;
+		nfs4_handle_exception(server, status, &exception);
+	} while (exception.retry);
+	return status;
+}
+
+/*
+ * This operation also signals the server that this client is
+ * performing "lease moved" recovery.  The server can stop
+ * returning NFS4ERR_LEASE_MOVED to this client.  A RENEW operation
+ * is appended to this compound to identify the client ID which is
+ * performing recovery.
+ */
+static int _nfs40_proc_fsid_present(struct inode *inode, const struct cred *cred)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+	struct rpc_clnt *clnt = server->client;
+	struct nfs4_fsid_present_arg args = {
+		.fh		= NFS_FH(inode),
+		.clientid	= clp->cl_clientid,
+		.renew		= 1,		/* append RENEW */
+	};
+	struct nfs4_fsid_present_res res = {
+		.renew		= 1,
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
+		.rpc_argp	= &args,
+		.rpc_resp	= &res,
+		.rpc_cred	= cred,
+	};
+	unsigned long now = jiffies;
+	int status;
+
+	res.fh = nfs_alloc_fhandle();
+	if (res.fh == NULL)
+		return -ENOMEM;
+
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
+	status = nfs4_call_sync_sequence(clnt, server, &msg,
+						&args.seq_args, &res.seq_res);
+	nfs_free_fhandle(res.fh);
+	if (status)
+		return status;
+
+	do_renew_lease(clp, now);
+	return 0;
+}
+
+#ifdef CONFIG_NFS_V4_1
+
+/*
+ * This operation also signals the server that this client is
+ * performing "lease moved" recovery.  The server can stop asserting
+ * SEQ4_STATUS_LEASE_MOVED for this client.  The client ID performing
+ * this operation is identified in the SEQUENCE operation in this
+ * compound.
+ */
+static int _nfs41_proc_fsid_present(struct inode *inode, const struct cred *cred)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct rpc_clnt *clnt = server->client;
+	struct nfs4_fsid_present_arg args = {
+		.fh		= NFS_FH(inode),
+	};
+	struct nfs4_fsid_present_res res = {
+	};
+	struct rpc_message msg = {
+		.rpc_proc	= &nfs4_procedures[NFSPROC4_CLNT_FSID_PRESENT],
+		.rpc_argp	= &args,
+		.rpc_resp	= &res,
+		.rpc_cred	= cred,
+	};
+	int status;
+
+	res.fh = nfs_alloc_fhandle();
+	if (res.fh == NULL)
+		return -ENOMEM;
+
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
+	status = nfs4_call_sync_sequence(clnt, server, &msg,
+						&args.seq_args, &res.seq_res);
+	nfs_free_fhandle(res.fh);
+	if (status == NFS4_OK &&
+	    res.seq_res.sr_status_flags & SEQ4_STATUS_LEASE_MOVED)
+		status = -NFS4ERR_LEASE_MOVED;
+	return status;
+}
+
+#endif	/* CONFIG_NFS_V4_1 */
+
+/**
+ * nfs4_proc_fsid_present - Is this FSID present or absent on server?
+ * @inode: inode on FSID to check
+ * @cred: credential to use for this operation
+ *
+ * Server indicates whether the FSID is present, moved, or not
+ * recognized.  This operation is necessary to clear a LEASE_MOVED
+ * condition for this client ID.
+ *
+ * Returns NFS4_OK if the FSID is present on this server,
+ * -NFS4ERR_MOVED if the FSID is no longer present, a negative
+ *  NFS4ERR code if some error occurred on the server, or a
+ *  negative errno if a local failure occurred.
+ */
+int nfs4_proc_fsid_present(struct inode *inode, const struct cred *cred)
+{
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct nfs_client *clp = server->nfs_client;
+	const struct nfs4_mig_recovery_ops *ops =
+					clp->cl_mvops->mig_recovery_ops;
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int status;
+
+	dprintk("%s: FSID %llx:%llx on \"%s\"\n", __func__,
+		(unsigned long long)server->fsid.major,
+		(unsigned long long)server->fsid.minor,
+		clp->cl_hostname);
+	nfs_display_fhandle(NFS_FH(inode), __func__);
+
+	do {
+		status = ops->fsid_present(inode, cred);
+		if (status != -NFS4ERR_DELAY)
+			break;
+		nfs4_handle_exception(server, status, &exception);
+	} while (exception.retry);
+	return status;
+}
+
+/*
+ * If 'use_integrity' is true and the state managment nfs_client
+ * cl_rpcclient is using krb5i/p, use the integrity protected cl_rpcclient
+ * and the machine credential as per RFC3530bis and RFC5661 Security
+ * Considerations sections. Otherwise, just use the user cred with the
+ * filesystem's rpc_client.
+ */
+static int _nfs4_proc_secinfo(struct inode *dir, const struct qstr *name, struct nfs4_secinfo_flavors *flavors, bool use_integrity)
+{
+	int status;
+	struct rpc_clnt *clnt = NFS_SERVER(dir)->client;
+	struct nfs_client *clp = NFS_SERVER(dir)->nfs_client;
+	struct nfs4_secinfo_arg args = {
+		.dir_fh = NFS_FH(dir),
+		.name   = name,
+	};
+	struct nfs4_secinfo_res res = {
+		.flavors     = flavors,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	struct nfs4_call_sync_data data = {
+		.seq_server = NFS_SERVER(dir),
+		.seq_args = &args.seq_args,
+		.seq_res = &res.seq_res,
+	};
+	struct rpc_task_setup task_setup = {
+		.rpc_client = clnt,
+		.rpc_message = &msg,
+		.callback_ops = clp->cl_mvops->call_sync_ops,
+		.callback_data = &data,
+		.flags = RPC_TASK_NO_ROUND_ROBIN,
+	};
+	const struct cred *cred = NULL;
+
+	if (use_integrity) {
+		clnt = clp->cl_rpcclient;
+		task_setup.rpc_client = clnt;
+
+		cred = nfs4_get_clid_cred(clp);
+		msg.rpc_cred = cred;
+	}
+
+	dprintk("NFS call  secinfo %s\n", name->name);
+
+	nfs4_state_protect(clp, NFS_SP4_MACH_CRED_SECINFO, &clnt, &msg);
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
+	status = nfs4_call_sync_custom(&task_setup);
+
+	dprintk("NFS reply  secinfo: %d\n", status);
+
+	put_cred(cred);
+	return status;
+}
+
+int nfs4_proc_secinfo(struct inode *dir, const struct qstr *name,
+		      struct nfs4_secinfo_flavors *flavors)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = -NFS4ERR_WRONGSEC;
+
+		/* try to use integrity protection with machine cred */
+		if (_nfs4_is_integrity_protected(NFS_SERVER(dir)->nfs_client))
+			err = _nfs4_proc_secinfo(dir, name, flavors, true);
+
+		/*
+		 * if unable to use integrity protection, or SECINFO with
+		 * integrity protection returns NFS4ERR_WRONGSEC (which is
+		 * disallowed by spec, but exists in deployed servers) use
+		 * the current filesystem's rpc_client and the user cred.
+		 */
+		if (err == -NFS4ERR_WRONGSEC)
+			err = _nfs4_proc_secinfo(dir, name, flavors, false);
+
+		trace_nfs4_secinfo(dir, name, err);
+		err = nfs4_handle_exception(NFS_SERVER(dir), err,
+				&exception);
+	} while (exception.retry);
+	return err;
+}
+
+#ifdef CONFIG_NFS_V4_1
+/*
+ * Check the exchange flags returned by the server for invalid flags, having
+ * both PNFS and NON_PNFS flags set, and not having one of NON_PNFS, PNFS, or
+ * DS flags set.
+ */
+static int nfs4_check_cl_exchange_flags(u32 flags, u32 version)
+{
+	if (version >= 2 && (flags & ~EXCHGID4_2_FLAG_MASK_R))
+		goto out_inval;
+	else if (version < 2 && (flags & ~EXCHGID4_FLAG_MASK_R))
+		goto out_inval;
+	if ((flags & EXCHGID4_FLAG_USE_PNFS_MDS) &&
+	    (flags & EXCHGID4_FLAG_USE_NON_PNFS))
+		goto out_inval;
+	if (!(flags & (EXCHGID4_FLAG_MASK_PNFS)))
+		goto out_inval;
+	return NFS_OK;
+out_inval:
+	return -NFS4ERR_INVAL;
+}
+
+static bool
+nfs41_same_server_scope(struct nfs41_server_scope *a,
+			struct nfs41_server_scope *b)
+{
+	if (a->server_scope_sz != b->server_scope_sz)
+		return false;
+	return memcmp(a->server_scope, b->server_scope, a->server_scope_sz) == 0;
+}
+
+static void
+nfs4_bind_one_conn_to_session_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs41_bind_conn_to_session_args *args = task->tk_msg.rpc_argp;
+	struct nfs41_bind_conn_to_session_res *res = task->tk_msg.rpc_resp;
+	struct nfs_client *clp = args->client;
+
+	switch (task->tk_status) {
+	case -NFS4ERR_BADSESSION:
+	case -NFS4ERR_DEADSESSION:
+		nfs4_schedule_session_recovery(clp->cl_session,
+				task->tk_status);
+		return;
+	}
+	if (args->dir == NFS4_CDFC4_FORE_OR_BOTH &&
+			res->dir != NFS4_CDFS4_BOTH) {
+		rpc_task_close_connection(task);
+		if (args->retries++ < MAX_BIND_CONN_TO_SESSION_RETRIES)
+			rpc_restart_call(task);
+	}
+}
+
+static const struct rpc_call_ops nfs4_bind_one_conn_to_session_ops = {
+	.rpc_call_done =  nfs4_bind_one_conn_to_session_done,
+};
+
+/*
+ * nfs4_proc_bind_one_conn_to_session()
+ *
+ * The 4.1 client currently uses the same TCP connection for the
+ * fore and backchannel.
+ */
+static
+int nfs4_proc_bind_one_conn_to_session(struct rpc_clnt *clnt,
+		struct rpc_xprt *xprt,
+		struct nfs_client *clp,
+		const struct cred *cred)
+{
+	int status;
+	struct nfs41_bind_conn_to_session_args args = {
+		.client = clp,
+		.dir = NFS4_CDFC4_FORE_OR_BOTH,
+		.retries = 0,
+	};
+	struct nfs41_bind_conn_to_session_res res;
+	struct rpc_message msg = {
+		.rpc_proc =
+			&nfs4_procedures[NFSPROC4_CLNT_BIND_CONN_TO_SESSION],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clnt,
+		.rpc_xprt = xprt,
+		.callback_ops = &nfs4_bind_one_conn_to_session_ops,
+		.rpc_message = &msg,
+		.flags = RPC_TASK_TIMEOUT,
+	};
+	struct rpc_task *task;
+
+	nfs4_copy_sessionid(&args.sessionid, &clp->cl_session->sess_id);
+	if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
+		args.dir = NFS4_CDFC4_FORE;
+
+	/* Do not set the backchannel flag unless this is clnt->cl_xprt */
+	if (xprt != rcu_access_pointer(clnt->cl_xprt))
+		args.dir = NFS4_CDFC4_FORE;
+
+	task = rpc_run_task(&task_setup_data);
+	if (!IS_ERR(task)) {
+		status = task->tk_status;
+		rpc_put_task(task);
+	} else
+		status = PTR_ERR(task);
+	trace_nfs4_bind_conn_to_session(clp, status);
+	if (status == 0) {
+		if (memcmp(res.sessionid.data,
+		    clp->cl_session->sess_id.data, NFS4_MAX_SESSIONID_LEN)) {
+			dprintk("NFS: %s: Session ID mismatch\n", __func__);
+			return -EIO;
+		}
+		if ((res.dir & args.dir) != res.dir || res.dir == 0) {
+			dprintk("NFS: %s: Unexpected direction from server\n",
+				__func__);
+			return -EIO;
+		}
+		if (res.use_conn_in_rdma_mode != args.use_conn_in_rdma_mode) {
+			dprintk("NFS: %s: Server returned RDMA mode = true\n",
+				__func__);
+			return -EIO;
+		}
+	}
+
+	return status;
+}
+
+struct rpc_bind_conn_calldata {
+	struct nfs_client *clp;
+	const struct cred *cred;
+};
+
+static int
+nfs4_proc_bind_conn_to_session_callback(struct rpc_clnt *clnt,
+		struct rpc_xprt *xprt,
+		void *calldata)
+{
+	struct rpc_bind_conn_calldata *p = calldata;
+
+	return nfs4_proc_bind_one_conn_to_session(clnt, xprt, p->clp, p->cred);
+}
+
+int nfs4_proc_bind_conn_to_session(struct nfs_client *clp, const struct cred *cred)
+{
+	struct rpc_bind_conn_calldata data = {
+		.clp = clp,
+		.cred = cred,
+	};
+	return rpc_clnt_iterate_for_each_xprt(clp->cl_rpcclient,
+			nfs4_proc_bind_conn_to_session_callback, &data);
+}
+
+/*
+ * Minimum set of SP4_MACH_CRED operations from RFC 5661 in the enforce map
+ * and operations we'd like to see to enable certain features in the allow map
+ */
+static const struct nfs41_state_protection nfs4_sp4_mach_cred_request = {
+	.how = SP4_MACH_CRED,
+	.enforce.u.words = {
+		[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
+		      1 << (OP_EXCHANGE_ID - 32) |
+		      1 << (OP_CREATE_SESSION - 32) |
+		      1 << (OP_DESTROY_SESSION - 32) |
+		      1 << (OP_DESTROY_CLIENTID - 32)
+	},
+	.allow.u.words = {
+		[0] = 1 << (OP_CLOSE) |
+		      1 << (OP_OPEN_DOWNGRADE) |
+		      1 << (OP_LOCKU) |
+		      1 << (OP_DELEGRETURN) |
+		      1 << (OP_COMMIT),
+		[1] = 1 << (OP_SECINFO - 32) |
+		      1 << (OP_SECINFO_NO_NAME - 32) |
+		      1 << (OP_LAYOUTRETURN - 32) |
+		      1 << (OP_TEST_STATEID - 32) |
+		      1 << (OP_FREE_STATEID - 32) |
+		      1 << (OP_WRITE - 32)
+	}
+};
+
+/*
+ * Select the state protection mode for client `clp' given the server results
+ * from exchange_id in `sp'.
+ *
+ * Returns 0 on success, negative errno otherwise.
+ */
+static int nfs4_sp4_select_mode(struct nfs_client *clp,
+				 struct nfs41_state_protection *sp)
+{
+	static const u32 supported_enforce[NFS4_OP_MAP_NUM_WORDS] = {
+		[1] = 1 << (OP_BIND_CONN_TO_SESSION - 32) |
+		      1 << (OP_EXCHANGE_ID - 32) |
+		      1 << (OP_CREATE_SESSION - 32) |
+		      1 << (OP_DESTROY_SESSION - 32) |
+		      1 << (OP_DESTROY_CLIENTID - 32)
+	};
+	unsigned long flags = 0;
+	unsigned int i;
+	int ret = 0;
+
+	if (sp->how == SP4_MACH_CRED) {
+		/* Print state protect result */
+		dfprintk(MOUNT, "Server SP4_MACH_CRED support:\n");
+		for (i = 0; i <= LAST_NFS4_OP; i++) {
+			if (test_bit(i, sp->enforce.u.longs))
+				dfprintk(MOUNT, "  enforce op %d\n", i);
+			if (test_bit(i, sp->allow.u.longs))
+				dfprintk(MOUNT, "  allow op %d\n", i);
+		}
+
+		/* make sure nothing is on enforce list that isn't supported */
+		for (i = 0; i < NFS4_OP_MAP_NUM_WORDS; i++) {
+			if (sp->enforce.u.words[i] & ~supported_enforce[i]) {
+				dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
+				ret = -EINVAL;
+				goto out;
+			}
+		}
+
+		/*
+		 * Minimal mode - state operations are allowed to use machine
+		 * credential.  Note this already happens by default, so the
+		 * client doesn't have to do anything more than the negotiation.
+		 *
+		 * NOTE: we don't care if EXCHANGE_ID is in the list -
+		 *       we're already using the machine cred for exchange_id
+		 *       and will never use a different cred.
+		 */
+		if (test_bit(OP_BIND_CONN_TO_SESSION, sp->enforce.u.longs) &&
+		    test_bit(OP_CREATE_SESSION, sp->enforce.u.longs) &&
+		    test_bit(OP_DESTROY_SESSION, sp->enforce.u.longs) &&
+		    test_bit(OP_DESTROY_CLIENTID, sp->enforce.u.longs)) {
+			dfprintk(MOUNT, "sp4_mach_cred:\n");
+			dfprintk(MOUNT, "  minimal mode enabled\n");
+			__set_bit(NFS_SP4_MACH_CRED_MINIMAL, &flags);
+		} else {
+			dfprintk(MOUNT, "sp4_mach_cred: disabled\n");
+			ret = -EINVAL;
+			goto out;
+		}
+
+		if (test_bit(OP_CLOSE, sp->allow.u.longs) &&
+		    test_bit(OP_OPEN_DOWNGRADE, sp->allow.u.longs) &&
+		    test_bit(OP_DELEGRETURN, sp->allow.u.longs) &&
+		    test_bit(OP_LOCKU, sp->allow.u.longs)) {
+			dfprintk(MOUNT, "  cleanup mode enabled\n");
+			__set_bit(NFS_SP4_MACH_CRED_CLEANUP, &flags);
+		}
+
+		if (test_bit(OP_LAYOUTRETURN, sp->allow.u.longs)) {
+			dfprintk(MOUNT, "  pnfs cleanup mode enabled\n");
+			__set_bit(NFS_SP4_MACH_CRED_PNFS_CLEANUP, &flags);
+		}
+
+		if (test_bit(OP_SECINFO, sp->allow.u.longs) &&
+		    test_bit(OP_SECINFO_NO_NAME, sp->allow.u.longs)) {
+			dfprintk(MOUNT, "  secinfo mode enabled\n");
+			__set_bit(NFS_SP4_MACH_CRED_SECINFO, &flags);
+		}
+
+		if (test_bit(OP_TEST_STATEID, sp->allow.u.longs) &&
+		    test_bit(OP_FREE_STATEID, sp->allow.u.longs)) {
+			dfprintk(MOUNT, "  stateid mode enabled\n");
+			__set_bit(NFS_SP4_MACH_CRED_STATEID, &flags);
+		}
+
+		if (test_bit(OP_WRITE, sp->allow.u.longs)) {
+			dfprintk(MOUNT, "  write mode enabled\n");
+			__set_bit(NFS_SP4_MACH_CRED_WRITE, &flags);
+		}
+
+		if (test_bit(OP_COMMIT, sp->allow.u.longs)) {
+			dfprintk(MOUNT, "  commit mode enabled\n");
+			__set_bit(NFS_SP4_MACH_CRED_COMMIT, &flags);
+		}
+	}
+out:
+	clp->cl_sp4_flags = flags;
+	return ret;
+}
+
+struct nfs41_exchange_id_data {
+	struct nfs41_exchange_id_res res;
+	struct nfs41_exchange_id_args args;
+};
+
+static void nfs4_exchange_id_release(void *data)
+{
+	struct nfs41_exchange_id_data *cdata =
+					(struct nfs41_exchange_id_data *)data;
+
+	nfs_put_client(cdata->args.client);
+	kfree(cdata->res.impl_id);
+	kfree(cdata->res.server_scope);
+	kfree(cdata->res.server_owner);
+	kfree(cdata);
+}
+
+static const struct rpc_call_ops nfs4_exchange_id_call_ops = {
+	.rpc_release = nfs4_exchange_id_release,
+};
+
+/*
+ * _nfs4_proc_exchange_id()
+ *
+ * Wrapper for EXCHANGE_ID operation.
+ */
+static struct rpc_task *
+nfs4_run_exchange_id(struct nfs_client *clp, const struct cred *cred,
+			u32 sp4_how, struct rpc_xprt *xprt)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_EXCHANGE_ID],
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clp->cl_rpcclient,
+		.callback_ops = &nfs4_exchange_id_call_ops,
+		.rpc_message = &msg,
+		.flags = RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN,
+	};
+	struct nfs41_exchange_id_data *calldata;
+	int status;
+
+	if (!refcount_inc_not_zero(&clp->cl_count))
+		return ERR_PTR(-EIO);
+
+	status = -ENOMEM;
+	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
+	if (!calldata)
+		goto out;
+
+	nfs4_init_boot_verifier(clp, &calldata->args.verifier);
+
+	status = nfs4_init_uniform_client_string(clp);
+	if (status)
+		goto out_calldata;
+
+	calldata->res.server_owner = kzalloc(sizeof(struct nfs41_server_owner),
+						GFP_NOFS);
+	status = -ENOMEM;
+	if (unlikely(calldata->res.server_owner == NULL))
+		goto out_calldata;
+
+	calldata->res.server_scope = kzalloc(sizeof(struct nfs41_server_scope),
+					GFP_NOFS);
+	if (unlikely(calldata->res.server_scope == NULL))
+		goto out_server_owner;
+
+	calldata->res.impl_id = kzalloc(sizeof(struct nfs41_impl_id), GFP_NOFS);
+	if (unlikely(calldata->res.impl_id == NULL))
+		goto out_server_scope;
+
+	switch (sp4_how) {
+	case SP4_NONE:
+		calldata->args.state_protect.how = SP4_NONE;
+		break;
+
+	case SP4_MACH_CRED:
+		calldata->args.state_protect = nfs4_sp4_mach_cred_request;
+		break;
+
+	default:
+		/* unsupported! */
+		WARN_ON_ONCE(1);
+		status = -EINVAL;
+		goto out_impl_id;
+	}
+	if (xprt) {
+		task_setup_data.rpc_xprt = xprt;
+		task_setup_data.flags |= RPC_TASK_SOFTCONN;
+		memcpy(calldata->args.verifier.data, clp->cl_confirm.data,
+				sizeof(calldata->args.verifier.data));
+	}
+	calldata->args.client = clp;
+	calldata->args.flags = EXCHGID4_FLAG_SUPP_MOVED_REFER |
+	EXCHGID4_FLAG_BIND_PRINC_STATEID;
+#ifdef CONFIG_NFS_V4_1_MIGRATION
+	calldata->args.flags |= EXCHGID4_FLAG_SUPP_MOVED_MIGR;
+#endif
+	if (test_bit(NFS_CS_DS, &clp->cl_flags))
+		calldata->args.flags |= EXCHGID4_FLAG_USE_PNFS_DS;
+	msg.rpc_argp = &calldata->args;
+	msg.rpc_resp = &calldata->res;
+	task_setup_data.callback_data = calldata;
+
+	return rpc_run_task(&task_setup_data);
+
+out_impl_id:
+	kfree(calldata->res.impl_id);
+out_server_scope:
+	kfree(calldata->res.server_scope);
+out_server_owner:
+	kfree(calldata->res.server_owner);
+out_calldata:
+	kfree(calldata);
+out:
+	nfs_put_client(clp);
+	return ERR_PTR(status);
+}
+
+/*
+ * _nfs4_proc_exchange_id()
+ *
+ * Wrapper for EXCHANGE_ID operation.
+ */
+static int _nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred,
+			u32 sp4_how)
+{
+	struct rpc_task *task;
+	struct nfs41_exchange_id_args *argp;
+	struct nfs41_exchange_id_res *resp;
+	unsigned long now = jiffies;
+	int status;
+
+	task = nfs4_run_exchange_id(clp, cred, sp4_how, NULL);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+
+	argp = task->tk_msg.rpc_argp;
+	resp = task->tk_msg.rpc_resp;
+	status = task->tk_status;
+	if (status  != 0)
+		goto out;
+
+	status = nfs4_check_cl_exchange_flags(resp->flags,
+			clp->cl_mvops->minor_version);
+	if (status  != 0)
+		goto out;
+
+	status = nfs4_sp4_select_mode(clp, &resp->state_protect);
+	if (status != 0)
+		goto out;
+
+	do_renew_lease(clp, now);
+
+	clp->cl_clientid = resp->clientid;
+	clp->cl_exchange_flags = resp->flags;
+	clp->cl_seqid = resp->seqid;
+	/* Client ID is not confirmed */
+	if (!(resp->flags & EXCHGID4_FLAG_CONFIRMED_R))
+		clear_bit(NFS4_SESSION_ESTABLISHED,
+			  &clp->cl_session->session_state);
+
+	if (clp->cl_serverscope != NULL &&
+	    !nfs41_same_server_scope(clp->cl_serverscope,
+				resp->server_scope)) {
+		dprintk("%s: server_scope mismatch detected\n",
+			__func__);
+		set_bit(NFS4CLNT_SERVER_SCOPE_MISMATCH, &clp->cl_state);
+	}
+
+	swap(clp->cl_serverowner, resp->server_owner);
+	swap(clp->cl_serverscope, resp->server_scope);
+	swap(clp->cl_implid, resp->impl_id);
+
+	/* Save the EXCHANGE_ID verifier session trunk tests */
+	memcpy(clp->cl_confirm.data, argp->verifier.data,
+	       sizeof(clp->cl_confirm.data));
+out:
+	trace_nfs4_exchange_id(clp, status);
+	rpc_put_task(task);
+	return status;
+}
+
+/*
+ * nfs4_proc_exchange_id()
+ *
+ * Returns zero, a negative errno, or a negative NFS4ERR status code.
+ *
+ * Since the clientid has expired, all compounds using sessions
+ * associated with the stale clientid will be returning
+ * NFS4ERR_BADSESSION in the sequence operation, and will therefore
+ * be in some phase of session reset.
+ *
+ * Will attempt to negotiate SP4_MACH_CRED if krb5i / krb5p auth is used.
+ */
+int nfs4_proc_exchange_id(struct nfs_client *clp, const struct cred *cred)
+{
+	rpc_authflavor_t authflavor = clp->cl_rpcclient->cl_auth->au_flavor;
+	int status;
+
+	/* try SP4_MACH_CRED if krb5i/p	*/
+	if (authflavor == RPC_AUTH_GSS_KRB5I ||
+	    authflavor == RPC_AUTH_GSS_KRB5P) {
+		status = _nfs4_proc_exchange_id(clp, cred, SP4_MACH_CRED);
+		if (!status)
+			return 0;
+	}
+
+	/* try SP4_NONE */
+	return _nfs4_proc_exchange_id(clp, cred, SP4_NONE);
+}
+
+/**
+ * nfs4_test_session_trunk
+ *
+ * This is an add_xprt_test() test function called from
+ * rpc_clnt_setup_test_and_add_xprt.
+ *
+ * The rpc_xprt_switch is referrenced by rpc_clnt_setup_test_and_add_xprt
+ * and is dereferrenced in nfs4_exchange_id_release
+ *
+ * Upon success, add the new transport to the rpc_clnt
+ *
+ * @clnt: struct rpc_clnt to get new transport
+ * @xprt: the rpc_xprt to test
+ * @data: call data for _nfs4_proc_exchange_id.
+ */
+void nfs4_test_session_trunk(struct rpc_clnt *clnt, struct rpc_xprt *xprt,
+			    void *data)
+{
+	struct nfs4_add_xprt_data *adata = data;
+	struct rpc_task *task;
+	int status;
+
+	u32 sp4_how;
+
+	dprintk("--> %s try %s\n", __func__,
+		xprt->address_strings[RPC_DISPLAY_ADDR]);
+
+	sp4_how = (adata->clp->cl_sp4_flags == 0 ? SP4_NONE : SP4_MACH_CRED);
+
+try_again:
+	/* Test connection for session trunking. Async exchange_id call */
+	task = nfs4_run_exchange_id(adata->clp, adata->cred, sp4_how, xprt);
+	if (IS_ERR(task))
+		return;
+
+	status = task->tk_status;
+	if (status == 0)
+		status = nfs4_detect_session_trunking(adata->clp,
+				task->tk_msg.rpc_resp, xprt);
+
+	if (status == 0)
+		rpc_clnt_xprt_switch_add_xprt(clnt, xprt);
+	else if (status != -NFS4ERR_DELAY && rpc_clnt_xprt_switch_has_addr(clnt,
+				(struct sockaddr *)&xprt->addr))
+		rpc_clnt_xprt_switch_remove_xprt(clnt, xprt);
+
+	rpc_put_task(task);
+	if (status == -NFS4ERR_DELAY) {
+		ssleep(1);
+		goto try_again;
+	}
+}
+EXPORT_SYMBOL_GPL(nfs4_test_session_trunk);
+
+static int _nfs4_proc_destroy_clientid(struct nfs_client *clp,
+		const struct cred *cred)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_CLIENTID],
+		.rpc_argp = clp,
+		.rpc_cred = cred,
+	};
+	int status;
+
+	status = rpc_call_sync(clp->cl_rpcclient, &msg,
+			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
+	trace_nfs4_destroy_clientid(clp, status);
+	if (status)
+		dprintk("NFS: Got error %d from the server %s on "
+			"DESTROY_CLIENTID.", status, clp->cl_hostname);
+	return status;
+}
+
+static int nfs4_proc_destroy_clientid(struct nfs_client *clp,
+		const struct cred *cred)
+{
+	unsigned int loop;
+	int ret;
+
+	for (loop = NFS4_MAX_LOOP_ON_RECOVER; loop != 0; loop--) {
+		ret = _nfs4_proc_destroy_clientid(clp, cred);
+		switch (ret) {
+		case -NFS4ERR_DELAY:
+		case -NFS4ERR_CLIENTID_BUSY:
+			ssleep(1);
+			break;
+		default:
+			return ret;
+		}
+	}
+	return 0;
+}
+
+int nfs4_destroy_clientid(struct nfs_client *clp)
+{
+	const struct cred *cred;
+	int ret = 0;
+
+	if (clp->cl_mvops->minor_version < 1)
+		goto out;
+	if (clp->cl_exchange_flags == 0)
+		goto out;
+	if (clp->cl_preserve_clid)
+		goto out;
+	cred = nfs4_get_clid_cred(clp);
+	ret = nfs4_proc_destroy_clientid(clp, cred);
+	put_cred(cred);
+	switch (ret) {
+	case 0:
+	case -NFS4ERR_STALE_CLIENTID:
+		clp->cl_exchange_flags = 0;
+	}
+out:
+	return ret;
+}
+
+#endif /* CONFIG_NFS_V4_1 */
+
+struct nfs4_get_lease_time_data {
+	struct nfs4_get_lease_time_args *args;
+	struct nfs4_get_lease_time_res *res;
+	struct nfs_client *clp;
+};
+
+static void nfs4_get_lease_time_prepare(struct rpc_task *task,
+					void *calldata)
+{
+	struct nfs4_get_lease_time_data *data =
+			(struct nfs4_get_lease_time_data *)calldata;
+
+	/* just setup sequence, do not trigger session recovery
+	   since we're invoked within one */
+	nfs4_setup_sequence(data->clp,
+			&data->args->la_seq_args,
+			&data->res->lr_seq_res,
+			task);
+}
+
+/*
+ * Called from nfs4_state_manager thread for session setup, so don't recover
+ * from sequence operation or clientid errors.
+ */
+static void nfs4_get_lease_time_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_get_lease_time_data *data =
+			(struct nfs4_get_lease_time_data *)calldata;
+
+	if (!nfs4_sequence_done(task, &data->res->lr_seq_res))
+		return;
+	switch (task->tk_status) {
+	case -NFS4ERR_DELAY:
+	case -NFS4ERR_GRACE:
+		rpc_delay(task, NFS4_POLL_RETRY_MIN);
+		task->tk_status = 0;
+		fallthrough;
+	case -NFS4ERR_RETRY_UNCACHED_REP:
+		rpc_restart_call_prepare(task);
+		return;
+	}
+}
+
+static const struct rpc_call_ops nfs4_get_lease_time_ops = {
+	.rpc_call_prepare = nfs4_get_lease_time_prepare,
+	.rpc_call_done = nfs4_get_lease_time_done,
+};
+
+int nfs4_proc_get_lease_time(struct nfs_client *clp, struct nfs_fsinfo *fsinfo)
+{
+	struct nfs4_get_lease_time_args args;
+	struct nfs4_get_lease_time_res res = {
+		.lr_fsinfo = fsinfo,
+	};
+	struct nfs4_get_lease_time_data data = {
+		.args = &args,
+		.res = &res,
+		.clp = clp,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GET_LEASE_TIME],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	struct rpc_task_setup task_setup = {
+		.rpc_client = clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_get_lease_time_ops,
+		.callback_data = &data,
+		.flags = RPC_TASK_TIMEOUT,
+	};
+
+	nfs4_init_sequence(&args.la_seq_args, &res.lr_seq_res, 0, 1);
+	return nfs4_call_sync_custom(&task_setup);
+}
+
+#ifdef CONFIG_NFS_V4_1
+
+/*
+ * Initialize the values to be used by the client in CREATE_SESSION
+ * If nfs4_init_session set the fore channel request and response sizes,
+ * use them.
+ *
+ * Set the back channel max_resp_sz_cached to zero to force the client to
+ * always set csa_cachethis to FALSE because the current implementation
+ * of the back channel DRC only supports caching the CB_SEQUENCE operation.
+ */
+static void nfs4_init_channel_attrs(struct nfs41_create_session_args *args,
+				    struct rpc_clnt *clnt)
+{
+	unsigned int max_rqst_sz, max_resp_sz;
+	unsigned int max_bc_payload = rpc_max_bc_payload(clnt);
+	unsigned int max_bc_slots = rpc_num_bc_slots(clnt);
+
+	max_rqst_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxwrite_overhead;
+	max_resp_sz = NFS_MAX_FILE_IO_SIZE + nfs41_maxread_overhead;
+
+	/* Fore channel attributes */
+	args->fc_attrs.max_rqst_sz = max_rqst_sz;
+	args->fc_attrs.max_resp_sz = max_resp_sz;
+	args->fc_attrs.max_ops = NFS4_MAX_OPS;
+	args->fc_attrs.max_reqs = max_session_slots;
+
+	dprintk("%s: Fore Channel : max_rqst_sz=%u max_resp_sz=%u "
+		"max_ops=%u max_reqs=%u\n",
+		__func__,
+		args->fc_attrs.max_rqst_sz, args->fc_attrs.max_resp_sz,
+		args->fc_attrs.max_ops, args->fc_attrs.max_reqs);
+
+	/* Back channel attributes */
+	args->bc_attrs.max_rqst_sz = max_bc_payload;
+	args->bc_attrs.max_resp_sz = max_bc_payload;
+	args->bc_attrs.max_resp_sz_cached = 0;
+	args->bc_attrs.max_ops = NFS4_MAX_BACK_CHANNEL_OPS;
+	args->bc_attrs.max_reqs = max_t(unsigned short, max_session_cb_slots, 1);
+	if (args->bc_attrs.max_reqs > max_bc_slots)
+		args->bc_attrs.max_reqs = max_bc_slots;
+
+	dprintk("%s: Back Channel : max_rqst_sz=%u max_resp_sz=%u "
+		"max_resp_sz_cached=%u max_ops=%u max_reqs=%u\n",
+		__func__,
+		args->bc_attrs.max_rqst_sz, args->bc_attrs.max_resp_sz,
+		args->bc_attrs.max_resp_sz_cached, args->bc_attrs.max_ops,
+		args->bc_attrs.max_reqs);
+}
+
+static int nfs4_verify_fore_channel_attrs(struct nfs41_create_session_args *args,
+		struct nfs41_create_session_res *res)
+{
+	struct nfs4_channel_attrs *sent = &args->fc_attrs;
+	struct nfs4_channel_attrs *rcvd = &res->fc_attrs;
+
+	if (rcvd->max_resp_sz > sent->max_resp_sz)
+		return -EINVAL;
+	/*
+	 * Our requested max_ops is the minimum we need; we're not
+	 * prepared to break up compounds into smaller pieces than that.
+	 * So, no point even trying to continue if the server won't
+	 * cooperate:
+	 */
+	if (rcvd->max_ops < sent->max_ops)
+		return -EINVAL;
+	if (rcvd->max_reqs == 0)
+		return -EINVAL;
+	if (rcvd->max_reqs > NFS4_MAX_SLOT_TABLE)
+		rcvd->max_reqs = NFS4_MAX_SLOT_TABLE;
+	return 0;
+}
+
+static int nfs4_verify_back_channel_attrs(struct nfs41_create_session_args *args,
+		struct nfs41_create_session_res *res)
+{
+	struct nfs4_channel_attrs *sent = &args->bc_attrs;
+	struct nfs4_channel_attrs *rcvd = &res->bc_attrs;
+
+	if (!(res->flags & SESSION4_BACK_CHAN))
+		goto out;
+	if (rcvd->max_rqst_sz > sent->max_rqst_sz)
+		return -EINVAL;
+	if (rcvd->max_resp_sz < sent->max_resp_sz)
+		return -EINVAL;
+	if (rcvd->max_resp_sz_cached > sent->max_resp_sz_cached)
+		return -EINVAL;
+	if (rcvd->max_ops > sent->max_ops)
+		return -EINVAL;
+	if (rcvd->max_reqs > sent->max_reqs)
+		return -EINVAL;
+out:
+	return 0;
+}
+
+static int nfs4_verify_channel_attrs(struct nfs41_create_session_args *args,
+				     struct nfs41_create_session_res *res)
+{
+	int ret;
+
+	ret = nfs4_verify_fore_channel_attrs(args, res);
+	if (ret)
+		return ret;
+	return nfs4_verify_back_channel_attrs(args, res);
+}
+
+static void nfs4_update_session(struct nfs4_session *session,
+		struct nfs41_create_session_res *res)
+{
+	nfs4_copy_sessionid(&session->sess_id, &res->sessionid);
+	/* Mark client id and session as being confirmed */
+	session->clp->cl_exchange_flags |= EXCHGID4_FLAG_CONFIRMED_R;
+	set_bit(NFS4_SESSION_ESTABLISHED, &session->session_state);
+	session->flags = res->flags;
+	memcpy(&session->fc_attrs, &res->fc_attrs, sizeof(session->fc_attrs));
+	if (res->flags & SESSION4_BACK_CHAN)
+		memcpy(&session->bc_attrs, &res->bc_attrs,
+				sizeof(session->bc_attrs));
+}
+
+static int _nfs4_proc_create_session(struct nfs_client *clp,
+		const struct cred *cred)
+{
+	struct nfs4_session *session = clp->cl_session;
+	struct nfs41_create_session_args args = {
+		.client = clp,
+		.clientid = clp->cl_clientid,
+		.seqid = clp->cl_seqid,
+		.cb_program = NFS4_CALLBACK,
+	};
+	struct nfs41_create_session_res res;
+
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_CREATE_SESSION],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = cred,
+	};
+	int status;
+
+	nfs4_init_channel_attrs(&args, clp->cl_rpcclient);
+	args.flags = (SESSION4_PERSIST | SESSION4_BACK_CHAN);
+
+	status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
+			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
+	trace_nfs4_create_session(clp, status);
+
+	switch (status) {
+	case -NFS4ERR_STALE_CLIENTID:
+	case -NFS4ERR_DELAY:
+	case -ETIMEDOUT:
+	case -EACCES:
+	case -EAGAIN:
+		goto out;
+	}
+
+	clp->cl_seqid++;
+	if (!status) {
+		/* Verify the session's negotiated channel_attrs values */
+		status = nfs4_verify_channel_attrs(&args, &res);
+		/* Increment the clientid slot sequence id */
+		if (status)
+			goto out;
+		nfs4_update_session(session, &res);
+	}
+out:
+	return status;
+}
+
+/*
+ * Issues a CREATE_SESSION operation to the server.
+ * It is the responsibility of the caller to verify the session is
+ * expired before calling this routine.
+ */
+int nfs4_proc_create_session(struct nfs_client *clp, const struct cred *cred)
+{
+	int status;
+	unsigned *ptr;
+	struct nfs4_session *session = clp->cl_session;
+	struct nfs4_add_xprt_data xprtdata = {
+		.clp = clp,
+	};
+	struct rpc_add_xprt_test rpcdata = {
+		.add_xprt_test = clp->cl_mvops->session_trunk,
+		.data = &xprtdata,
+	};
+
+	dprintk("--> %s clp=%p session=%p\n", __func__, clp, session);
+
+	status = _nfs4_proc_create_session(clp, cred);
+	if (status)
+		goto out;
+
+	/* Init or reset the session slot tables */
+	status = nfs4_setup_session_slot_tables(session);
+	dprintk("slot table setup returned %d\n", status);
+	if (status)
+		goto out;
+
+	ptr = (unsigned *)&session->sess_id.data[0];
+	dprintk("%s client>seqid %d sessionid %u:%u:%u:%u\n", __func__,
+		clp->cl_seqid, ptr[0], ptr[1], ptr[2], ptr[3]);
+	rpc_clnt_probe_trunked_xprts(clp->cl_rpcclient, &rpcdata);
+out:
+	return status;
+}
+
+/*
+ * Issue the over-the-wire RPC DESTROY_SESSION.
+ * The caller must serialize access to this routine.
+ */
+int nfs4_proc_destroy_session(struct nfs4_session *session,
+		const struct cred *cred)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_DESTROY_SESSION],
+		.rpc_argp = session,
+		.rpc_cred = cred,
+	};
+	int status = 0;
+
+	/* session is still being setup */
+	if (!test_and_clear_bit(NFS4_SESSION_ESTABLISHED, &session->session_state))
+		return 0;
+
+	status = rpc_call_sync(session->clp->cl_rpcclient, &msg,
+			       RPC_TASK_TIMEOUT | RPC_TASK_NO_ROUND_ROBIN);
+	trace_nfs4_destroy_session(session->clp, status);
+
+	if (status)
+		dprintk("NFS: Got error %d from the server on DESTROY_SESSION. "
+			"Session has been destroyed regardless...\n", status);
+	rpc_clnt_manage_trunked_xprts(session->clp->cl_rpcclient);
+	return status;
+}
+
+/*
+ * Renew the cl_session lease.
+ */
+struct nfs4_sequence_data {
+	struct nfs_client *clp;
+	struct nfs4_sequence_args args;
+	struct nfs4_sequence_res res;
+};
+
+static void nfs41_sequence_release(void *data)
+{
+	struct nfs4_sequence_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+
+	if (refcount_read(&clp->cl_count) > 1)
+		nfs4_schedule_state_renewal(clp);
+	nfs_put_client(clp);
+	kfree(calldata);
+}
+
+static int nfs41_sequence_handle_errors(struct rpc_task *task, struct nfs_client *clp)
+{
+	switch(task->tk_status) {
+	case -NFS4ERR_DELAY:
+		rpc_delay(task, NFS4_POLL_RETRY_MAX);
+		return -EAGAIN;
+	default:
+		nfs4_schedule_lease_recovery(clp);
+	}
+	return 0;
+}
+
+static void nfs41_sequence_call_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_sequence_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+
+	if (!nfs41_sequence_done(task, task->tk_msg.rpc_resp))
+		return;
+
+	trace_nfs4_sequence(clp, task->tk_status);
+	if (task->tk_status < 0 && !task->tk_client->cl_shutdown) {
+		dprintk("%s ERROR %d\n", __func__, task->tk_status);
+		if (refcount_read(&clp->cl_count) == 1)
+			return;
+
+		if (nfs41_sequence_handle_errors(task, clp) == -EAGAIN) {
+			rpc_restart_call_prepare(task);
+			return;
+		}
+	}
+	dprintk("%s rpc_cred %p\n", __func__, task->tk_msg.rpc_cred);
+}
+
+static void nfs41_sequence_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_sequence_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+	struct nfs4_sequence_args *args;
+	struct nfs4_sequence_res *res;
+
+	args = task->tk_msg.rpc_argp;
+	res = task->tk_msg.rpc_resp;
+
+	nfs4_setup_sequence(clp, args, res, task);
+}
+
+static const struct rpc_call_ops nfs41_sequence_ops = {
+	.rpc_call_done = nfs41_sequence_call_done,
+	.rpc_call_prepare = nfs41_sequence_prepare,
+	.rpc_release = nfs41_sequence_release,
+};
+
+static struct rpc_task *_nfs41_proc_sequence(struct nfs_client *clp,
+		const struct cred *cred,
+		struct nfs4_slot *slot,
+		bool is_privileged)
+{
+	struct nfs4_sequence_data *calldata;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SEQUENCE],
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs41_sequence_ops,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_TIMEOUT | RPC_TASK_MOVEABLE,
+	};
+	struct rpc_task *ret;
+
+	ret = ERR_PTR(-EIO);
+	if (!refcount_inc_not_zero(&clp->cl_count))
+		goto out_err;
+
+	ret = ERR_PTR(-ENOMEM);
+	calldata = kzalloc(sizeof(*calldata), GFP_KERNEL);
+	if (calldata == NULL)
+		goto out_put_clp;
+	nfs4_init_sequence(&calldata->args, &calldata->res, 0, is_privileged);
+	nfs4_sequence_attach_slot(&calldata->args, &calldata->res, slot);
+	msg.rpc_argp = &calldata->args;
+	msg.rpc_resp = &calldata->res;
+	calldata->clp = clp;
+	task_setup_data.callback_data = calldata;
+
+	ret = rpc_run_task(&task_setup_data);
+	if (IS_ERR(ret))
+		goto out_err;
+	return ret;
+out_put_clp:
+	nfs_put_client(clp);
+out_err:
+	nfs41_release_slot(slot);
+	return ret;
+}
+
+static int nfs41_proc_async_sequence(struct nfs_client *clp, const struct cred *cred, unsigned renew_flags)
+{
+	struct rpc_task *task;
+	int ret = 0;
+
+	if ((renew_flags & NFS4_RENEW_TIMEOUT) == 0)
+		return -EAGAIN;
+	task = _nfs41_proc_sequence(clp, cred, NULL, false);
+	if (IS_ERR(task))
+		ret = PTR_ERR(task);
+	else
+		rpc_put_task_async(task);
+	dprintk("<-- %s status=%d\n", __func__, ret);
+	return ret;
+}
+
+static int nfs4_proc_sequence(struct nfs_client *clp, const struct cred *cred)
+{
+	struct rpc_task *task;
+	int ret;
+
+	task = _nfs41_proc_sequence(clp, cred, NULL, true);
+	if (IS_ERR(task)) {
+		ret = PTR_ERR(task);
+		goto out;
+	}
+	ret = rpc_wait_for_completion_task(task);
+	if (!ret)
+		ret = task->tk_status;
+	rpc_put_task(task);
+out:
+	dprintk("<-- %s status=%d\n", __func__, ret);
+	return ret;
+}
+
+struct nfs4_reclaim_complete_data {
+	struct nfs_client *clp;
+	struct nfs41_reclaim_complete_args arg;
+	struct nfs41_reclaim_complete_res res;
+};
+
+static void nfs4_reclaim_complete_prepare(struct rpc_task *task, void *data)
+{
+	struct nfs4_reclaim_complete_data *calldata = data;
+
+	nfs4_setup_sequence(calldata->clp,
+			&calldata->arg.seq_args,
+			&calldata->res.seq_res,
+			task);
+}
+
+static int nfs41_reclaim_complete_handle_errors(struct rpc_task *task, struct nfs_client *clp)
+{
+	switch(task->tk_status) {
+	case 0:
+		wake_up_all(&clp->cl_lock_waitq);
+		fallthrough;
+	case -NFS4ERR_COMPLETE_ALREADY:
+	case -NFS4ERR_WRONG_CRED: /* What to do here? */
+		break;
+	case -NFS4ERR_DELAY:
+		rpc_delay(task, NFS4_POLL_RETRY_MAX);
+		fallthrough;
+	case -NFS4ERR_RETRY_UNCACHED_REP:
+	case -EACCES:
+		dprintk("%s: failed to reclaim complete error %d for server %s, retrying\n",
+			__func__, task->tk_status, clp->cl_hostname);
+		return -EAGAIN;
+	case -NFS4ERR_BADSESSION:
+	case -NFS4ERR_DEADSESSION:
+	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+		break;
+	default:
+		nfs4_schedule_lease_recovery(clp);
+	}
+	return 0;
+}
+
+static void nfs4_reclaim_complete_done(struct rpc_task *task, void *data)
+{
+	struct nfs4_reclaim_complete_data *calldata = data;
+	struct nfs_client *clp = calldata->clp;
+	struct nfs4_sequence_res *res = &calldata->res.seq_res;
+
+	if (!nfs41_sequence_done(task, res))
+		return;
+
+	trace_nfs4_reclaim_complete(clp, task->tk_status);
+	if (nfs41_reclaim_complete_handle_errors(task, clp) == -EAGAIN) {
+		rpc_restart_call_prepare(task);
+		return;
+	}
+}
+
+static void nfs4_free_reclaim_complete_data(void *data)
+{
+	struct nfs4_reclaim_complete_data *calldata = data;
+
+	kfree(calldata);
+}
+
+static const struct rpc_call_ops nfs4_reclaim_complete_call_ops = {
+	.rpc_call_prepare = nfs4_reclaim_complete_prepare,
+	.rpc_call_done = nfs4_reclaim_complete_done,
+	.rpc_release = nfs4_free_reclaim_complete_data,
+};
+
+/*
+ * Issue a global reclaim complete.
+ */
+static int nfs41_proc_reclaim_complete(struct nfs_client *clp,
+		const struct cred *cred)
+{
+	struct nfs4_reclaim_complete_data *calldata;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_RECLAIM_COMPLETE],
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = clp->cl_rpcclient,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_reclaim_complete_call_ops,
+		.flags = RPC_TASK_NO_ROUND_ROBIN,
+	};
+	int status = -ENOMEM;
+
+	calldata = kzalloc(sizeof(*calldata), GFP_NOFS);
+	if (calldata == NULL)
+		goto out;
+	calldata->clp = clp;
+	calldata->arg.one_fs = 0;
+
+	nfs4_init_sequence(&calldata->arg.seq_args, &calldata->res.seq_res, 0, 1);
+	msg.rpc_argp = &calldata->arg;
+	msg.rpc_resp = &calldata->res;
+	task_setup_data.callback_data = calldata;
+	status = nfs4_call_sync_custom(&task_setup_data);
+out:
+	dprintk("<-- %s status=%d\n", __func__, status);
+	return status;
+}
+
+static void
+nfs4_layoutget_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutget *lgp = calldata;
+	struct nfs_server *server = NFS_SERVER(lgp->args.inode);
+
+	nfs4_setup_sequence(server->nfs_client, &lgp->args.seq_args,
+				&lgp->res.seq_res, task);
+}
+
+static void nfs4_layoutget_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutget *lgp = calldata;
+
+	nfs41_sequence_process(task, &lgp->res.seq_res);
+}
+
+static int
+nfs4_layoutget_handle_exception(struct rpc_task *task,
+		struct nfs4_layoutget *lgp, struct nfs4_exception *exception)
+{
+	struct inode *inode = lgp->args.inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct pnfs_layout_hdr *lo = lgp->lo;
+	int nfs4err = task->tk_status;
+	int err, status = 0;
+	LIST_HEAD(head);
+
+	dprintk("--> %s tk_status => %d\n", __func__, -task->tk_status);
+
+	nfs4_sequence_free_slot(&lgp->res.seq_res);
+
+	switch (nfs4err) {
+	case 0:
+		goto out;
+
+	/*
+	 * NFS4ERR_LAYOUTUNAVAILABLE means we are not supposed to use pnfs
+	 * on the file. set tk_status to -ENODATA to tell upper layer to
+	 * retry go inband.
+	 */
+	case -NFS4ERR_LAYOUTUNAVAILABLE:
+		status = -ENODATA;
+		goto out;
+	/*
+	 * NFS4ERR_BADLAYOUT means the MDS cannot return a layout of
+	 * length lgp->args.minlength != 0 (see RFC5661 section 18.43.3).
+	 */
+	case -NFS4ERR_BADLAYOUT:
+		status = -EOVERFLOW;
+		goto out;
+	/*
+	 * NFS4ERR_LAYOUTTRYLATER is a conflict with another client
+	 * (or clients) writing to the same RAID stripe except when
+	 * the minlength argument is 0 (see RFC5661 section 18.43.3).
+	 *
+	 * Treat it like we would RECALLCONFLICT -- we retry for a little
+	 * while, and then eventually give up.
+	 */
+	case -NFS4ERR_LAYOUTTRYLATER:
+		if (lgp->args.minlength == 0) {
+			status = -EOVERFLOW;
+			goto out;
+		}
+		status = -EBUSY;
+		break;
+	case -NFS4ERR_RECALLCONFLICT:
+	case -NFS4ERR_RETURNCONFLICT:
+		status = -ERECALLCONFLICT;
+		break;
+	case -NFS4ERR_DELEG_REVOKED:
+	case -NFS4ERR_ADMIN_REVOKED:
+	case -NFS4ERR_EXPIRED:
+	case -NFS4ERR_BAD_STATEID:
+		exception->timeout = 0;
+		spin_lock(&inode->i_lock);
+		/* If the open stateid was bad, then recover it. */
+		if (!lo || test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags) ||
+		    !nfs4_stateid_match_other(&lgp->args.stateid, &lo->plh_stateid)) {
+			spin_unlock(&inode->i_lock);
+			exception->state = lgp->args.ctx->state;
+			exception->stateid = &lgp->args.stateid;
+			break;
+		}
+
+		/*
+		 * Mark the bad layout state as invalid, then retry
+		 */
+		pnfs_mark_layout_stateid_invalid(lo, &head);
+		spin_unlock(&inode->i_lock);
+		nfs_commit_inode(inode, 0);
+		pnfs_free_lseg_list(&head);
+		status = -EAGAIN;
+		goto out;
+	}
+
+	err = nfs4_handle_exception(server, nfs4err, exception);
+	if (!status) {
+		if (exception->retry)
+			status = -EAGAIN;
+		else
+			status = err;
+	}
+out:
+	return status;
+}
+
+size_t max_response_pages(struct nfs_server *server)
+{
+	u32 max_resp_sz = server->nfs_client->cl_session->fc_attrs.max_resp_sz;
+	return nfs_page_array_len(0, max_resp_sz);
+}
+
+static void nfs4_layoutget_release(void *calldata)
+{
+	struct nfs4_layoutget *lgp = calldata;
+
+	nfs4_sequence_free_slot(&lgp->res.seq_res);
+	pnfs_layoutget_free(lgp);
+}
+
+static const struct rpc_call_ops nfs4_layoutget_call_ops = {
+	.rpc_call_prepare = nfs4_layoutget_prepare,
+	.rpc_call_done = nfs4_layoutget_done,
+	.rpc_release = nfs4_layoutget_release,
+};
+
+struct pnfs_layout_segment *
+nfs4_proc_layoutget(struct nfs4_layoutget *lgp, long *timeout)
+{
+	struct inode *inode = lgp->args.inode;
+	struct nfs_server *server = NFS_SERVER(inode);
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTGET],
+		.rpc_argp = &lgp->args,
+		.rpc_resp = &lgp->res,
+		.rpc_cred = lgp->cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_layoutget_call_ops,
+		.callback_data = lgp,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_CRED_NOREF |
+			 RPC_TASK_MOVEABLE,
+	};
+	struct pnfs_layout_segment *lseg = NULL;
+	struct nfs4_exception exception = {
+		.inode = inode,
+		.timeout = *timeout,
+	};
+	int status = 0;
+
+	nfs4_init_sequence(&lgp->args.seq_args, &lgp->res.seq_res, 0, 0);
+
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return ERR_CAST(task);
+
+	status = rpc_wait_for_completion_task(task);
+	if (status != 0)
+		goto out;
+
+	if (task->tk_status < 0) {
+		status = nfs4_layoutget_handle_exception(task, lgp, &exception);
+		*timeout = exception.timeout;
+	} else if (lgp->res.layoutp->len == 0) {
+		status = -EAGAIN;
+		*timeout = nfs4_update_delay(&exception.timeout);
+	} else
+		lseg = pnfs_layout_process(lgp);
+out:
+	trace_nfs4_layoutget(lgp->args.ctx,
+			&lgp->args.range,
+			&lgp->res.range,
+			&lgp->res.stateid,
+			status);
+
+	rpc_put_task(task);
+	dprintk("<-- %s status=%d\n", __func__, status);
+	if (status)
+		return ERR_PTR(status);
+	return lseg;
+}
+
+static void
+nfs4_layoutreturn_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutreturn *lrp = calldata;
+
+	nfs4_setup_sequence(lrp->clp,
+			&lrp->args.seq_args,
+			&lrp->res.seq_res,
+			task);
+	if (!pnfs_layout_is_valid(lrp->args.layout))
+		rpc_exit(task, 0);
+}
+
+static void nfs4_layoutreturn_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutreturn *lrp = calldata;
+	struct nfs_server *server;
+
+	if (!nfs41_sequence_process(task, &lrp->res.seq_res))
+		return;
+
+	/*
+	 * Was there an RPC level error? Assume the call succeeded,
+	 * and that we need to release the layout
+	 */
+	if (task->tk_rpc_status != 0 && RPC_WAS_SENT(task)) {
+		lrp->res.lrs_present = 0;
+		return;
+	}
+
+	server = NFS_SERVER(lrp->args.inode);
+	switch (task->tk_status) {
+	case -NFS4ERR_OLD_STATEID:
+		if (nfs4_layout_refresh_old_stateid(&lrp->args.stateid,
+					&lrp->args.range,
+					lrp->args.inode))
+			goto out_restart;
+		fallthrough;
+	default:
+		task->tk_status = 0;
+		fallthrough;
+	case 0:
+		break;
+	case -NFS4ERR_DELAY:
+		if (nfs4_async_handle_error(task, server, NULL, NULL) != -EAGAIN)
+			break;
+		goto out_restart;
+	}
+	return;
+out_restart:
+	task->tk_status = 0;
+	nfs4_sequence_free_slot(&lrp->res.seq_res);
+	rpc_restart_call_prepare(task);
+}
+
+static void nfs4_layoutreturn_release(void *calldata)
+{
+	struct nfs4_layoutreturn *lrp = calldata;
+	struct pnfs_layout_hdr *lo = lrp->args.layout;
+
+	pnfs_layoutreturn_free_lsegs(lo, &lrp->args.stateid, &lrp->args.range,
+			lrp->res.lrs_present ? &lrp->res.stateid : NULL);
+	nfs4_sequence_free_slot(&lrp->res.seq_res);
+	if (lrp->ld_private.ops && lrp->ld_private.ops->free)
+		lrp->ld_private.ops->free(&lrp->ld_private);
+	pnfs_put_layout_hdr(lrp->args.layout);
+	nfs_iput_and_deactive(lrp->inode);
+	put_cred(lrp->cred);
+	kfree(calldata);
+}
+
+static const struct rpc_call_ops nfs4_layoutreturn_call_ops = {
+	.rpc_call_prepare = nfs4_layoutreturn_prepare,
+	.rpc_call_done = nfs4_layoutreturn_done,
+	.rpc_release = nfs4_layoutreturn_release,
+};
+
+int nfs4_proc_layoutreturn(struct nfs4_layoutreturn *lrp, bool sync)
+{
+	struct rpc_task *task;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTRETURN],
+		.rpc_argp = &lrp->args,
+		.rpc_resp = &lrp->res,
+		.rpc_cred = lrp->cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.rpc_client = NFS_SERVER(lrp->args.inode)->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_layoutreturn_call_ops,
+		.callback_data = lrp,
+		.flags = RPC_TASK_MOVEABLE,
+	};
+	int status = 0;
+
+	nfs4_state_protect(NFS_SERVER(lrp->args.inode)->nfs_client,
+			NFS_SP4_MACH_CRED_PNFS_CLEANUP,
+			&task_setup_data.rpc_client, &msg);
+
+	lrp->inode = nfs_igrab_and_active(lrp->args.inode);
+	if (!sync) {
+		if (!lrp->inode) {
+			nfs4_layoutreturn_release(lrp);
+			return -EAGAIN;
+		}
+		task_setup_data.flags |= RPC_TASK_ASYNC;
+	}
+	if (!lrp->inode)
+		nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
+				   1);
+	else
+		nfs4_init_sequence(&lrp->args.seq_args, &lrp->res.seq_res, 1,
+				   0);
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	if (sync)
+		status = task->tk_status;
+	trace_nfs4_layoutreturn(lrp->args.inode, &lrp->args.stateid, status);
+	dprintk("<-- %s status=%d\n", __func__, status);
+	rpc_put_task(task);
+	return status;
+}
+
+static int
+_nfs4_proc_getdeviceinfo(struct nfs_server *server,
+		struct pnfs_device *pdev,
+		const struct cred *cred)
+{
+	struct nfs4_getdeviceinfo_args args = {
+		.pdev = pdev,
+		.notify_types = NOTIFY_DEVICEID4_CHANGE |
+			NOTIFY_DEVICEID4_DELETE,
+	};
+	struct nfs4_getdeviceinfo_res res = {
+		.pdev = pdev,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_GETDEVICEINFO],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = cred,
+	};
+	int status;
+
+	status = nfs4_call_sync(server->client, server, &msg, &args.seq_args, &res.seq_res, 0);
+	if (res.notification & ~args.notify_types)
+		dprintk("%s: unsupported notification\n", __func__);
+	if (res.notification != args.notify_types)
+		pdev->nocache = 1;
+
+	trace_nfs4_getdeviceinfo(server, &pdev->dev_id, status);
+
+	dprintk("<-- %s status=%d\n", __func__, status);
+
+	return status;
+}
+
+int nfs4_proc_getdeviceinfo(struct nfs_server *server,
+		struct pnfs_device *pdev,
+		const struct cred *cred)
+{
+	struct nfs4_exception exception = { };
+	int err;
+
+	do {
+		err = nfs4_handle_exception(server,
+					_nfs4_proc_getdeviceinfo(server, pdev, cred),
+					&exception);
+	} while (exception.retry);
+	return err;
+}
+EXPORT_SYMBOL_GPL(nfs4_proc_getdeviceinfo);
+
+static void nfs4_layoutcommit_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutcommit_data *data = calldata;
+	struct nfs_server *server = NFS_SERVER(data->args.inode);
+
+	nfs4_setup_sequence(server->nfs_client,
+			&data->args.seq_args,
+			&data->res.seq_res,
+			task);
+}
+
+static void
+nfs4_layoutcommit_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs4_layoutcommit_data *data = calldata;
+	struct nfs_server *server = NFS_SERVER(data->args.inode);
+
+	if (!nfs41_sequence_done(task, &data->res.seq_res))
+		return;
+
+	switch (task->tk_status) { /* Just ignore these failures */
+	case -NFS4ERR_DELEG_REVOKED: /* layout was recalled */
+	case -NFS4ERR_BADIOMODE:     /* no IOMODE_RW layout for range */
+	case -NFS4ERR_BADLAYOUT:     /* no layout */
+	case -NFS4ERR_GRACE:	    /* loca_recalim always false */
+		task->tk_status = 0;
+		break;
+	case 0:
+		break;
+	default:
+		if (nfs4_async_handle_error(task, server, NULL, NULL) == -EAGAIN) {
+			rpc_restart_call_prepare(task);
+			return;
+		}
+	}
+}
+
+static void nfs4_layoutcommit_release(void *calldata)
+{
+	struct nfs4_layoutcommit_data *data = calldata;
+
+	pnfs_cleanup_layoutcommit(data);
+	nfs_post_op_update_inode_force_wcc(data->args.inode,
+					   data->res.fattr);
+	put_cred(data->cred);
+	nfs_iput_and_deactive(data->inode);
+	kfree(data);
+}
+
+static const struct rpc_call_ops nfs4_layoutcommit_ops = {
+	.rpc_call_prepare = nfs4_layoutcommit_prepare,
+	.rpc_call_done = nfs4_layoutcommit_done,
+	.rpc_release = nfs4_layoutcommit_release,
+};
+
+int
+nfs4_proc_layoutcommit(struct nfs4_layoutcommit_data *data, bool sync)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_LAYOUTCOMMIT],
+		.rpc_argp = &data->args,
+		.rpc_resp = &data->res,
+		.rpc_cred = data->cred,
+	};
+	struct rpc_task_setup task_setup_data = {
+		.task = &data->task,
+		.rpc_client = NFS_CLIENT(data->args.inode),
+		.rpc_message = &msg,
+		.callback_ops = &nfs4_layoutcommit_ops,
+		.callback_data = data,
+		.flags = RPC_TASK_MOVEABLE,
+	};
+	struct rpc_task *task;
+	int status = 0;
+
+	dprintk("NFS: initiating layoutcommit call. sync %d "
+		"lbw: %llu inode %lu\n", sync,
+		data->args.lastbytewritten,
+		data->args.inode->i_ino);
+
+	if (!sync) {
+		data->inode = nfs_igrab_and_active(data->args.inode);
+		if (data->inode == NULL) {
+			nfs4_layoutcommit_release(data);
+			return -EAGAIN;
+		}
+		task_setup_data.flags = RPC_TASK_ASYNC;
+	}
+	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, 0);
+	task = rpc_run_task(&task_setup_data);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	if (sync)
+		status = task->tk_status;
+	trace_nfs4_layoutcommit(data->args.inode, &data->args.stateid, status);
+	dprintk("%s: status %d\n", __func__, status);
+	rpc_put_task(task);
+	return status;
+}
+
+/*
+ * Use the state managment nfs_client cl_rpcclient, which uses krb5i (if
+ * possible) as per RFC3530bis and RFC5661 Security Considerations sections
+ */
+static int
+_nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
+		    struct nfs_fsinfo *info,
+		    struct nfs4_secinfo_flavors *flavors, bool use_integrity)
+{
+	struct nfs41_secinfo_no_name_args args = {
+		.style = SECINFO_STYLE_CURRENT_FH,
+	};
+	struct nfs4_secinfo_res res = {
+		.flavors = flavors,
+	};
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_SECINFO_NO_NAME],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+	};
+	struct nfs4_call_sync_data data = {
+		.seq_server = server,
+		.seq_args = &args.seq_args,
+		.seq_res = &res.seq_res,
+	};
+	struct rpc_task_setup task_setup = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = server->nfs_client->cl_mvops->call_sync_ops,
+		.callback_data = &data,
+		.flags = RPC_TASK_NO_ROUND_ROBIN,
+	};
+	const struct cred *cred = NULL;
+	int status;
+
+	if (use_integrity) {
+		task_setup.rpc_client = server->nfs_client->cl_rpcclient;
+
+		cred = nfs4_get_clid_cred(server->nfs_client);
+		msg.rpc_cred = cred;
+	}
+
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 0);
+	status = nfs4_call_sync_custom(&task_setup);
+	dprintk("<-- %s status=%d\n", __func__, status);
+
+	put_cred(cred);
+
+	return status;
+}
+
+static int
+nfs41_proc_secinfo_no_name(struct nfs_server *server, struct nfs_fh *fhandle,
+			   struct nfs_fsinfo *info, struct nfs4_secinfo_flavors *flavors)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		/* first try using integrity protection */
+		err = -NFS4ERR_WRONGSEC;
+
+		/* try to use integrity protection with machine cred */
+		if (_nfs4_is_integrity_protected(server->nfs_client))
+			err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
+							  flavors, true);
+
+		/*
+		 * if unable to use integrity protection, or SECINFO with
+		 * integrity protection returns NFS4ERR_WRONGSEC (which is
+		 * disallowed by spec, but exists in deployed servers) use
+		 * the current filesystem's rpc_client and the user cred.
+		 */
+		if (err == -NFS4ERR_WRONGSEC)
+			err = _nfs41_proc_secinfo_no_name(server, fhandle, info,
+							  flavors, false);
+
+		switch (err) {
+		case 0:
+		case -NFS4ERR_WRONGSEC:
+		case -ENOTSUPP:
+			goto out;
+		default:
+			err = nfs4_handle_exception(server, err, &exception);
+		}
+	} while (exception.retry);
+out:
+	return err;
+}
+
+static int
+nfs41_find_root_sec(struct nfs_server *server, struct nfs_fh *fhandle,
+		    struct nfs_fsinfo *info)
+{
+	int err;
+	struct page *page;
+	rpc_authflavor_t flavor = RPC_AUTH_MAXFLAVOR;
+	struct nfs4_secinfo_flavors *flavors;
+	struct nfs4_secinfo4 *secinfo;
+	int i;
+
+	page = alloc_page(GFP_KERNEL);
+	if (!page) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	flavors = page_address(page);
+	err = nfs41_proc_secinfo_no_name(server, fhandle, info, flavors);
+
+	/*
+	 * Fall back on "guess and check" method if
+	 * the server doesn't support SECINFO_NO_NAME
+	 */
+	if (err == -NFS4ERR_WRONGSEC || err == -ENOTSUPP) {
+		err = nfs4_find_root_sec(server, fhandle, info);
+		goto out_freepage;
+	}
+	if (err)
+		goto out_freepage;
+
+	for (i = 0; i < flavors->num_flavors; i++) {
+		secinfo = &flavors->flavors[i];
+
+		switch (secinfo->flavor) {
+		case RPC_AUTH_NULL:
+		case RPC_AUTH_UNIX:
+		case RPC_AUTH_GSS:
+			flavor = rpcauth_get_pseudoflavor(secinfo->flavor,
+					&secinfo->flavor_info);
+			break;
+		default:
+			flavor = RPC_AUTH_MAXFLAVOR;
+			break;
+		}
+
+		if (!nfs_auth_info_match(&server->auth_info, flavor))
+			flavor = RPC_AUTH_MAXFLAVOR;
+
+		if (flavor != RPC_AUTH_MAXFLAVOR) {
+			err = nfs4_lookup_root_sec(server, fhandle,
+						   info, flavor);
+			if (!err)
+				break;
+		}
+	}
+
+	if (flavor == RPC_AUTH_MAXFLAVOR)
+		err = -EPERM;
+
+out_freepage:
+	put_page(page);
+	if (err == -EACCES)
+		return -EPERM;
+out:
+	return err;
+}
+
+static int _nfs41_test_stateid(struct nfs_server *server,
+		nfs4_stateid *stateid,
+		const struct cred *cred)
+{
+	int status;
+	struct nfs41_test_stateid_args args = {
+		.stateid = stateid,
+	};
+	struct nfs41_test_stateid_res res;
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_TEST_STATEID],
+		.rpc_argp = &args,
+		.rpc_resp = &res,
+		.rpc_cred = cred,
+	};
+	struct rpc_clnt *rpc_client = server->client;
+
+	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
+		&rpc_client, &msg);
+
+	dprintk("NFS call  test_stateid %p\n", stateid);
+	nfs4_init_sequence(&args.seq_args, &res.seq_res, 0, 1);
+	status = nfs4_call_sync_sequence(rpc_client, server, &msg,
+			&args.seq_args, &res.seq_res);
+	if (status != NFS_OK) {
+		dprintk("NFS reply test_stateid: failed, %d\n", status);
+		return status;
+	}
+	dprintk("NFS reply test_stateid: succeeded, %d\n", -res.status);
+	return -res.status;
+}
+
+static void nfs4_handle_delay_or_session_error(struct nfs_server *server,
+		int err, struct nfs4_exception *exception)
+{
+	exception->retry = 0;
+	switch(err) {
+	case -NFS4ERR_DELAY:
+	case -NFS4ERR_RETRY_UNCACHED_REP:
+		nfs4_handle_exception(server, err, exception);
+		break;
+	case -NFS4ERR_BADSESSION:
+	case -NFS4ERR_BADSLOT:
+	case -NFS4ERR_BAD_HIGH_SLOT:
+	case -NFS4ERR_CONN_NOT_BOUND_TO_SESSION:
+	case -NFS4ERR_DEADSESSION:
+		nfs4_do_handle_exception(server, err, exception);
+	}
+}
+
+/**
+ * nfs41_test_stateid - perform a TEST_STATEID operation
+ *
+ * @server: server / transport on which to perform the operation
+ * @stateid: state ID to test
+ * @cred: credential
+ *
+ * Returns NFS_OK if the server recognizes that "stateid" is valid.
+ * Otherwise a negative NFS4ERR value is returned if the operation
+ * failed or the state ID is not currently valid.
+ */
+static int nfs41_test_stateid(struct nfs_server *server,
+		nfs4_stateid *stateid,
+		const struct cred *cred)
+{
+	struct nfs4_exception exception = {
+		.interruptible = true,
+	};
+	int err;
+	do {
+		err = _nfs41_test_stateid(server, stateid, cred);
+		nfs4_handle_delay_or_session_error(server, err, &exception);
+	} while (exception.retry);
+	return err;
+}
+
+struct nfs_free_stateid_data {
+	struct nfs_server *server;
+	struct nfs41_free_stateid_args args;
+	struct nfs41_free_stateid_res res;
+};
+
+static void nfs41_free_stateid_prepare(struct rpc_task *task, void *calldata)
+{
+	struct nfs_free_stateid_data *data = calldata;
+	nfs4_setup_sequence(data->server->nfs_client,
+			&data->args.seq_args,
+			&data->res.seq_res,
+			task);
+}
+
+static void nfs41_free_stateid_done(struct rpc_task *task, void *calldata)
+{
+	struct nfs_free_stateid_data *data = calldata;
+
+	nfs41_sequence_done(task, &data->res.seq_res);
+
+	switch (task->tk_status) {
+	case -NFS4ERR_DELAY:
+		if (nfs4_async_handle_error(task, data->server, NULL, NULL) == -EAGAIN)
+			rpc_restart_call_prepare(task);
+	}
+}
+
+static void nfs41_free_stateid_release(void *calldata)
+{
+	struct nfs_free_stateid_data *data = calldata;
+	struct nfs_client *clp = data->server->nfs_client;
+
+	nfs_put_client(clp);
+	kfree(calldata);
+}
+
+static const struct rpc_call_ops nfs41_free_stateid_ops = {
+	.rpc_call_prepare = nfs41_free_stateid_prepare,
+	.rpc_call_done = nfs41_free_stateid_done,
+	.rpc_release = nfs41_free_stateid_release,
+};
+
+/**
+ * nfs41_free_stateid - perform a FREE_STATEID operation
+ *
+ * @server: server / transport on which to perform the operation
+ * @stateid: state ID to release
+ * @cred: credential
+ * @privileged: set to true if this call needs to be privileged
+ *
+ * Note: this function is always asynchronous.
+ */
+static int nfs41_free_stateid(struct nfs_server *server,
+		const nfs4_stateid *stateid,
+		const struct cred *cred,
+		bool privileged)
+{
+	struct rpc_message msg = {
+		.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_FREE_STATEID],
+		.rpc_cred = cred,
+	};
+	struct rpc_task_setup task_setup = {
+		.rpc_client = server->client,
+		.rpc_message = &msg,
+		.callback_ops = &nfs41_free_stateid_ops,
+		.flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
+	};
+	struct nfs_free_stateid_data *data;
+	struct rpc_task *task;
+	struct nfs_client *clp = server->nfs_client;
+
+	if (!refcount_inc_not_zero(&clp->cl_count))
+		return -EIO;
+
+	nfs4_state_protect(server->nfs_client, NFS_SP4_MACH_CRED_STATEID,
+		&task_setup.rpc_client, &msg);
+
+	dprintk("NFS call  free_stateid %p\n", stateid);
+	data = kmalloc(sizeof(*data), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+	data->server = server;
+	nfs4_stateid_copy(&data->args.stateid, stateid);
+
+	task_setup.callback_data = data;
+
+	msg.rpc_argp = &data->args;
+	msg.rpc_resp = &data->res;
+	nfs4_init_sequence(&data->args.seq_args, &data->res.seq_res, 1, privileged);
+	task = rpc_run_task(&task_setup);
+	if (IS_ERR(task))
+		return PTR_ERR(task);
+	rpc_put_task(task);
+	return 0;
+}
+
+static void
+nfs41_free_lock_state(struct nfs_server *server, struct nfs4_lock_state *lsp)
+{
+	const struct cred *cred = lsp->ls_state->owner->so_cred;
+
+	nfs41_free_stateid(server, &lsp->ls_stateid, cred, false);
+	nfs4_free_lock_state(server, lsp);
+}
+
+static bool nfs41_match_stateid(const nfs4_stateid *s1,
+		const nfs4_stateid *s2)
+{
+	if (s1->type != s2->type)
+		return false;
+
+	if (memcmp(s1->other, s2->other, sizeof(s1->other)) != 0)
+		return false;
+
+	if (s1->seqid == s2->seqid)
+		return true;
+
+	return s1->seqid == 0 || s2->seqid == 0;
+}
+
+#endif /* CONFIG_NFS_V4_1 */
+
+static bool nfs4_match_stateid(const nfs4_stateid *s1,
+		const nfs4_stateid *s2)
+{
+	return nfs4_stateid_match(s1, s2);
+}
+
+
+static const struct nfs4_state_recovery_ops nfs40_reboot_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
+	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
+	.recover_open	= nfs4_open_reclaim,
+	.recover_lock	= nfs4_lock_reclaim,
+	.establish_clid = nfs4_init_clientid,
+	.detect_trunking = nfs40_discover_server_trunking,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_state_recovery_ops nfs41_reboot_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_REBOOT,
+	.state_flag_bit	= NFS_STATE_RECLAIM_REBOOT,
+	.recover_open	= nfs4_open_reclaim,
+	.recover_lock	= nfs4_lock_reclaim,
+	.establish_clid = nfs41_init_clientid,
+	.reclaim_complete = nfs41_proc_reclaim_complete,
+	.detect_trunking = nfs41_discover_server_trunking,
+};
+#endif /* CONFIG_NFS_V4_1 */
+
+static const struct nfs4_state_recovery_ops nfs40_nograce_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
+	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
+	.recover_open	= nfs40_open_expired,
+	.recover_lock	= nfs4_lock_expired,
+	.establish_clid = nfs4_init_clientid,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_state_recovery_ops nfs41_nograce_recovery_ops = {
+	.owner_flag_bit = NFS_OWNER_RECLAIM_NOGRACE,
+	.state_flag_bit	= NFS_STATE_RECLAIM_NOGRACE,
+	.recover_open	= nfs41_open_expired,
+	.recover_lock	= nfs41_lock_expired,
+	.establish_clid = nfs41_init_clientid,
+};
+#endif /* CONFIG_NFS_V4_1 */
+
+static const struct nfs4_state_maintenance_ops nfs40_state_renewal_ops = {
+	.sched_state_renewal = nfs4_proc_async_renew,
+	.get_state_renewal_cred = nfs4_get_renew_cred,
+	.renew_lease = nfs4_proc_renew,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_state_maintenance_ops nfs41_state_renewal_ops = {
+	.sched_state_renewal = nfs41_proc_async_sequence,
+	.get_state_renewal_cred = nfs4_get_machine_cred,
+	.renew_lease = nfs4_proc_sequence,
+};
+#endif
+
+static const struct nfs4_mig_recovery_ops nfs40_mig_recovery_ops = {
+	.get_locations = _nfs40_proc_get_locations,
+	.fsid_present = _nfs40_proc_fsid_present,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct nfs4_mig_recovery_ops nfs41_mig_recovery_ops = {
+	.get_locations = _nfs41_proc_get_locations,
+	.fsid_present = _nfs41_proc_fsid_present,
+};
+#endif	/* CONFIG_NFS_V4_1 */
+
+static const struct nfs4_minor_version_ops nfs_v4_0_minor_ops = {
+	.minor_version = 0,
+	.init_caps = NFS_CAP_READDIRPLUS
+		| NFS_CAP_ATOMIC_OPEN
+		| NFS_CAP_POSIX_LOCK,
+	.init_client = nfs40_init_client,
+	.shutdown_client = nfs40_shutdown_client,
+	.match_stateid = nfs4_match_stateid,
+	.find_root_sec = nfs4_find_root_sec,
+	.free_lock_state = nfs4_release_lockowner,
+	.test_and_free_expired = nfs40_test_and_free_expired_stateid,
+	.alloc_seqid = nfs_alloc_seqid,
+	.call_sync_ops = &nfs40_call_sync_ops,
+	.reboot_recovery_ops = &nfs40_reboot_recovery_ops,
+	.nograce_recovery_ops = &nfs40_nograce_recovery_ops,
+	.state_renewal_ops = &nfs40_state_renewal_ops,
+	.mig_recovery_ops = &nfs40_mig_recovery_ops,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static struct nfs_seqid *
+nfs_alloc_no_seqid(struct nfs_seqid_counter *arg1, gfp_t arg2)
+{
+	return NULL;
+}
+
+static const struct nfs4_minor_version_ops nfs_v4_1_minor_ops = {
+	.minor_version = 1,
+	.init_caps = NFS_CAP_READDIRPLUS
+		| NFS_CAP_ATOMIC_OPEN
+		| NFS_CAP_POSIX_LOCK
+		| NFS_CAP_STATEID_NFSV41
+		| NFS_CAP_ATOMIC_OPEN_V1
+		| NFS_CAP_LGOPEN
+		| NFS_CAP_MOVEABLE,
+	.init_client = nfs41_init_client,
+	.shutdown_client = nfs41_shutdown_client,
+	.match_stateid = nfs41_match_stateid,
+	.find_root_sec = nfs41_find_root_sec,
+	.free_lock_state = nfs41_free_lock_state,
+	.test_and_free_expired = nfs41_test_and_free_expired_stateid,
+	.alloc_seqid = nfs_alloc_no_seqid,
+	.session_trunk = nfs4_test_session_trunk,
+	.call_sync_ops = &nfs41_call_sync_ops,
+	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
+	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
+	.state_renewal_ops = &nfs41_state_renewal_ops,
+	.mig_recovery_ops = &nfs41_mig_recovery_ops,
+};
+#endif
+
+#if defined(CONFIG_NFS_V4_2)
+static const struct nfs4_minor_version_ops nfs_v4_2_minor_ops = {
+	.minor_version = 2,
+	.init_caps = NFS_CAP_READDIRPLUS
+		| NFS_CAP_ATOMIC_OPEN
+		| NFS_CAP_POSIX_LOCK
+		| NFS_CAP_STATEID_NFSV41
+		| NFS_CAP_ATOMIC_OPEN_V1
+		| NFS_CAP_LGOPEN
+		| NFS_CAP_ALLOCATE
+		| NFS_CAP_COPY
+		| NFS_CAP_OFFLOAD_CANCEL
+		| NFS_CAP_COPY_NOTIFY
+		| NFS_CAP_DEALLOCATE
+		| NFS_CAP_SEEK
+		| NFS_CAP_LAYOUTSTATS
+		| NFS_CAP_CLONE
+		| NFS_CAP_LAYOUTERROR
+		| NFS_CAP_READ_PLUS
+		| NFS_CAP_MOVEABLE,
+	.init_client = nfs41_init_client,
+	.shutdown_client = nfs41_shutdown_client,
+	.match_stateid = nfs41_match_stateid,
+	.find_root_sec = nfs41_find_root_sec,
+	.free_lock_state = nfs41_free_lock_state,
+	.call_sync_ops = &nfs41_call_sync_ops,
+	.test_and_free_expired = nfs41_test_and_free_expired_stateid,
+	.alloc_seqid = nfs_alloc_no_seqid,
+	.session_trunk = nfs4_test_session_trunk,
+	.reboot_recovery_ops = &nfs41_reboot_recovery_ops,
+	.nograce_recovery_ops = &nfs41_nograce_recovery_ops,
+	.state_renewal_ops = &nfs41_state_renewal_ops,
+	.mig_recovery_ops = &nfs41_mig_recovery_ops,
+};
+#endif
+
+const struct nfs4_minor_version_ops *nfs_v4_minor_ops[] = {
+	[0] = &nfs_v4_0_minor_ops,
+#if defined(CONFIG_NFS_V4_1)
+	[1] = &nfs_v4_1_minor_ops,
+#endif
+#if defined(CONFIG_NFS_V4_2)
+	[2] = &nfs_v4_2_minor_ops,
+#endif
+};
+
+static ssize_t nfs4_listxattr(struct dentry *dentry, char *list, size_t size)
+{
+	ssize_t error, error2, error3;
+
+	error = generic_listxattr(dentry, list, size);
+	if (error < 0)
+		return error;
+	if (list) {
+		list += error;
+		size -= error;
+	}
+
+	error2 = nfs4_listxattr_nfs4_label(d_inode(dentry), list, size);
+	if (error2 < 0)
+		return error2;
+
+	if (list) {
+		list += error2;
+		size -= error2;
+	}
+
+	error3 = nfs4_listxattr_nfs4_user(d_inode(dentry), list, size);
+	if (error3 < 0)
+		return error3;
+
+	return error + error2 + error3;
+}
+
+static void nfs4_enable_swap(struct inode *inode)
+{
+	/* The state manager thread must always be running.
+	 * It will notice the client is a swapper, and stay put.
+	 */
+	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+
+	nfs4_schedule_state_manager(clp);
+}
+
+static void nfs4_disable_swap(struct inode *inode)
+{
+	/* The state manager thread will now exit once it is
+	 * woken.
+	 */
+	struct nfs_client *clp = NFS_SERVER(inode)->nfs_client;
+
+	set_bit(NFS4CLNT_RUN_MANAGER, &clp->cl_state);
+	clear_bit(NFS4CLNT_MANAGER_AVAILABLE, &clp->cl_state);
+	wake_up_var(&clp->cl_state);
+}
+
+static const struct inode_operations nfs4_dir_inode_operations = {
+	.create		= nfs_create,
+	.lookup		= nfs_lookup,
+	.atomic_open	= nfs_atomic_open,
+	.link		= nfs_link,
+	.unlink		= nfs_unlink,
+	.symlink	= nfs_symlink,
+	.mkdir		= nfs_mkdir,
+	.rmdir		= nfs_rmdir,
+	.mknod		= nfs_mknod,
+	.rename		= nfs_rename,
+	.permission	= nfs_permission,
+	.getattr	= nfs_getattr,
+	.setattr	= nfs_setattr,
+	.listxattr	= nfs4_listxattr,
+};
+
+static const struct inode_operations nfs4_file_inode_operations = {
+	.permission	= nfs_permission,
+	.getattr	= nfs_getattr,
+	.setattr	= nfs_setattr,
+	.listxattr	= nfs4_listxattr,
+};
+
+const struct nfs_rpc_ops nfs_v4_clientops = {
+	.version	= 4,			/* protocol version */
+	.dentry_ops	= &nfs4_dentry_operations,
+	.dir_inode_ops	= &nfs4_dir_inode_operations,
+	.file_inode_ops	= &nfs4_file_inode_operations,
+	.file_ops	= &nfs4_file_operations,
+	.getroot	= nfs4_proc_get_root,
+	.submount	= nfs4_submount,
+	.try_get_tree	= nfs4_try_get_tree,
+	.getattr	= nfs4_proc_getattr,
+	.setattr	= nfs4_proc_setattr,
+	.lookup		= nfs4_proc_lookup,
+	.lookupp	= nfs4_proc_lookupp,
+	.access		= nfs4_proc_access,
+	.readlink	= nfs4_proc_readlink,
+	.create		= nfs4_proc_create,
+	.remove		= nfs4_proc_remove,
+	.unlink_setup	= nfs4_proc_unlink_setup,
+	.unlink_rpc_prepare = nfs4_proc_unlink_rpc_prepare,
+	.unlink_done	= nfs4_proc_unlink_done,
+	.rename_setup	= nfs4_proc_rename_setup,
+	.rename_rpc_prepare = nfs4_proc_rename_rpc_prepare,
+	.rename_done	= nfs4_proc_rename_done,
+	.link		= nfs4_proc_link,
+	.symlink	= nfs4_proc_symlink,
+	.mkdir		= nfs4_proc_mkdir,
+	.rmdir		= nfs4_proc_rmdir,
+	.readdir	= nfs4_proc_readdir,
+	.mknod		= nfs4_proc_mknod,
+	.statfs		= nfs4_proc_statfs,
+	.fsinfo		= nfs4_proc_fsinfo,
+	.pathconf	= nfs4_proc_pathconf,
+	.set_capabilities = nfs4_server_capabilities,
+	.decode_dirent	= nfs4_decode_dirent,
+	.pgio_rpc_prepare = nfs4_proc_pgio_rpc_prepare,
+	.read_setup	= nfs4_proc_read_setup,
+	.read_done	= nfs4_read_done,
+	.write_setup	= nfs4_proc_write_setup,
+	.write_done	= nfs4_write_done,
+	.commit_setup	= nfs4_proc_commit_setup,
+	.commit_rpc_prepare = nfs4_proc_commit_rpc_prepare,
+	.commit_done	= nfs4_commit_done,
+	.lock		= nfs4_proc_lock,
+	.clear_acl_cache = nfs4_zap_acl_attr,
+	.close_context  = nfs4_close_context,
+	.open_context	= nfs4_atomic_open,
+	.have_delegation = nfs4_have_delegation,
+	.alloc_client	= nfs4_alloc_client,
+	.init_client	= nfs4_init_client,
+	.free_client	= nfs4_free_client,
+	.create_server	= nfs4_create_server,
+	.clone_server	= nfs_clone_server,
+	.discover_trunking = nfs4_discover_trunking,
+	.enable_swap	= nfs4_enable_swap,
+	.disable_swap	= nfs4_disable_swap,
+};
+
+static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
+	.name	= XATTR_NAME_NFSV4_ACL,
+	.list	= nfs4_xattr_list_nfs4_acl,
+	.get	= nfs4_xattr_get_nfs4_acl,
+	.set	= nfs4_xattr_set_nfs4_acl,
+};
+
+#if defined(CONFIG_NFS_V4_1)
+static const struct xattr_handler nfs4_xattr_nfs4_dacl_handler = {
+	.name	= XATTR_NAME_NFSV4_DACL,
+	.list	= nfs4_xattr_list_nfs4_dacl,
+	.get	= nfs4_xattr_get_nfs4_dacl,
+	.set	= nfs4_xattr_set_nfs4_dacl,
+};
+
+static const struct xattr_handler nfs4_xattr_nfs4_sacl_handler = {
+	.name	= XATTR_NAME_NFSV4_SACL,
+	.list	= nfs4_xattr_list_nfs4_sacl,
+	.get	= nfs4_xattr_get_nfs4_sacl,
+	.set	= nfs4_xattr_set_nfs4_sacl,
+};
+#endif
+
+#ifdef CONFIG_NFS_V4_2
+static const struct xattr_handler nfs4_xattr_nfs4_user_handler = {
+	.prefix	= XATTR_USER_PREFIX,
+	.get	= nfs4_xattr_get_nfs4_user,
+	.set	= nfs4_xattr_set_nfs4_user,
+};
+#endif
+
+const struct xattr_handler *nfs4_xattr_handlers[] = {
+	&nfs4_xattr_nfs4_acl_handler,
+#if defined(CONFIG_NFS_V4_1)
+	&nfs4_xattr_nfs4_dacl_handler,
+	&nfs4_xattr_nfs4_sacl_handler,
+#endif
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+	&nfs4_xattr_nfs4_label_handler,
+#endif
+#ifdef CONFIG_NFS_V4_2
+	&nfs4_xattr_nfs4_user_handler,
+#endif
+	NULL
+};