diff options
Diffstat (limited to 'fs/nfs/nfs4proc.c')
| -rw-r--r-- | fs/nfs/nfs4proc.c | 10767 |
1 files changed, 10767 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c new file mode 100644 index 000000000..ec3f0103e --- /dev/null +++ b/fs/nfs/nfs4proc.c @@ -0,0 +1,10767 @@ +/* + * 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, + int openflags) +{ + 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; + /* + * Use openflags to check for exec, because fmode won't + * always have FMODE_EXEC set when file open for exec. + */ + if (openflags & __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, + int flags, 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, flags); + 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, flags, 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; + } + up_read(&nfsi->rwsem); + mutex_unlock(&sp->so_delegreturn_mutex); + if (status != 0) + goto out; + /* Is this a delegated lock? */ + lsp = request->fl_u.nfs4_fl.owner; + 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, long 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, long 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 user_namespace *mnt_userns, + 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 user_namespace *mnt_userns, + 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 user_namespace *mnt_userns, + 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 user_namespace *mnt_userns, + 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 user_namespace *mnt_userns, + 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) { + 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 +}; 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