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-rw-r--r--fs/nfs/inode.c2540
1 files changed, 2540 insertions, 0 deletions
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
new file mode 100644
index 0000000000..e21c073158
--- /dev/null
+++ b/fs/nfs/inode.c
@@ -0,0 +1,2540 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * linux/fs/nfs/inode.c
+ *
+ * Copyright (C) 1992 Rick Sladkey
+ *
+ * nfs inode and superblock handling functions
+ *
+ * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
+ * experimental NFS changes. Modularisation taken straight from SYS5 fs.
+ *
+ * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
+ * J.S.Peatfield@damtp.cam.ac.uk
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/sched/signal.h>
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/stat.h>
+#include <linux/errno.h>
+#include <linux/unistd.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/sunrpc/stats.h>
+#include <linux/sunrpc/metrics.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_mount.h>
+#include <linux/nfs4_mount.h>
+#include <linux/lockd/bind.h>
+#include <linux/seq_file.h>
+#include <linux/mount.h>
+#include <linux/vfs.h>
+#include <linux/inet.h>
+#include <linux/nfs_xdr.h>
+#include <linux/slab.h>
+#include <linux/compat.h>
+#include <linux/freezer.h>
+#include <linux/uaccess.h>
+#include <linux/iversion.h>
+
+#include "nfs4_fs.h"
+#include "callback.h"
+#include "delegation.h"
+#include "iostat.h"
+#include "internal.h"
+#include "fscache.h"
+#include "pnfs.h"
+#include "nfs.h"
+#include "netns.h"
+#include "sysfs.h"
+
+#include "nfstrace.h"
+
+#define NFSDBG_FACILITY NFSDBG_VFS
+
+#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
+
+/* Default is to see 64-bit inode numbers */
+static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
+
+static int nfs_update_inode(struct inode *, struct nfs_fattr *);
+
+static struct kmem_cache * nfs_inode_cachep;
+
+static inline unsigned long
+nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
+{
+ return nfs_fileid_to_ino_t(fattr->fileid);
+}
+
+int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
+{
+ schedule();
+ if (signal_pending_state(mode, current))
+ return -ERESTARTSYS;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
+
+/**
+ * nfs_compat_user_ino64 - returns the user-visible inode number
+ * @fileid: 64-bit fileid
+ *
+ * This function returns a 32-bit inode number if the boot parameter
+ * nfs.enable_ino64 is zero.
+ */
+u64 nfs_compat_user_ino64(u64 fileid)
+{
+#ifdef CONFIG_COMPAT
+ compat_ulong_t ino;
+#else
+ unsigned long ino;
+#endif
+
+ if (enable_ino64)
+ return fileid;
+ ino = fileid;
+ if (sizeof(ino) < sizeof(fileid))
+ ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
+ return ino;
+}
+
+int nfs_drop_inode(struct inode *inode)
+{
+ return NFS_STALE(inode) || generic_drop_inode(inode);
+}
+EXPORT_SYMBOL_GPL(nfs_drop_inode);
+
+void nfs_clear_inode(struct inode *inode)
+{
+ /*
+ * The following should never happen...
+ */
+ WARN_ON_ONCE(nfs_have_writebacks(inode));
+ WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
+ nfs_zap_acl_cache(inode);
+ nfs_access_zap_cache(inode);
+ nfs_fscache_clear_inode(inode);
+}
+EXPORT_SYMBOL_GPL(nfs_clear_inode);
+
+void nfs_evict_inode(struct inode *inode)
+{
+ truncate_inode_pages_final(&inode->i_data);
+ clear_inode(inode);
+ nfs_clear_inode(inode);
+}
+
+int nfs_sync_inode(struct inode *inode)
+{
+ inode_dio_wait(inode);
+ return nfs_wb_all(inode);
+}
+EXPORT_SYMBOL_GPL(nfs_sync_inode);
+
+/**
+ * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
+ * @mapping: pointer to struct address_space
+ */
+int nfs_sync_mapping(struct address_space *mapping)
+{
+ int ret = 0;
+
+ if (mapping->nrpages != 0) {
+ unmap_mapping_range(mapping, 0, 0, 0);
+ ret = nfs_wb_all(mapping->host);
+ }
+ return ret;
+}
+
+static int nfs_attribute_timeout(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
+}
+
+static bool nfs_check_cache_flags_invalid(struct inode *inode,
+ unsigned long flags)
+{
+ unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
+
+ return (cache_validity & flags) != 0;
+}
+
+bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
+{
+ if (nfs_check_cache_flags_invalid(inode, flags))
+ return true;
+ return nfs_attribute_cache_expired(inode);
+}
+EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
+
+#ifdef CONFIG_NFS_V4_2
+static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
+{
+ return nfsi->xattr_cache != NULL;
+}
+#else
+static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
+{
+ return false;
+}
+#endif
+
+void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
+
+ if (have_delegation) {
+ if (!(flags & NFS_INO_REVAL_FORCED))
+ flags &= ~(NFS_INO_INVALID_MODE |
+ NFS_INO_INVALID_OTHER |
+ NFS_INO_INVALID_XATTR);
+ flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
+ }
+
+ if (!nfs_has_xattr_cache(nfsi))
+ flags &= ~NFS_INO_INVALID_XATTR;
+ if (flags & NFS_INO_INVALID_DATA)
+ nfs_fscache_invalidate(inode, 0);
+ flags &= ~NFS_INO_REVAL_FORCED;
+
+ nfsi->cache_validity |= flags;
+
+ if (inode->i_mapping->nrpages == 0) {
+ nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
+ nfs_ooo_clear(nfsi);
+ } else if (nfsi->cache_validity & NFS_INO_INVALID_DATA) {
+ nfs_ooo_clear(nfsi);
+ }
+ trace_nfs_set_cache_invalid(inode, 0);
+}
+EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
+
+/*
+ * Invalidate the local caches
+ */
+static void nfs_zap_caches_locked(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ int mode = inode->i_mode;
+
+ nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
+
+ nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+ nfsi->attrtimeo_timestamp = jiffies;
+
+ if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
+ NFS_INO_INVALID_DATA |
+ NFS_INO_INVALID_ACCESS |
+ NFS_INO_INVALID_ACL |
+ NFS_INO_INVALID_XATTR);
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
+ NFS_INO_INVALID_ACCESS |
+ NFS_INO_INVALID_ACL |
+ NFS_INO_INVALID_XATTR);
+ nfs_zap_label_cache_locked(nfsi);
+}
+
+void nfs_zap_caches(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ nfs_zap_caches_locked(inode);
+ spin_unlock(&inode->i_lock);
+}
+
+void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
+{
+ if (mapping->nrpages != 0) {
+ spin_lock(&inode->i_lock);
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
+ spin_unlock(&inode->i_lock);
+ }
+}
+
+void nfs_zap_acl_cache(struct inode *inode)
+{
+ void (*clear_acl_cache)(struct inode *);
+
+ clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
+ if (clear_acl_cache != NULL)
+ clear_acl_cache(inode);
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
+ spin_unlock(&inode->i_lock);
+}
+EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
+
+void nfs_invalidate_atime(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
+ spin_unlock(&inode->i_lock);
+}
+EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
+
+/*
+ * Invalidate, but do not unhash, the inode.
+ * NB: must be called with inode->i_lock held!
+ */
+static void nfs_set_inode_stale_locked(struct inode *inode)
+{
+ set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
+ nfs_zap_caches_locked(inode);
+ trace_nfs_set_inode_stale(inode);
+}
+
+void nfs_set_inode_stale(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ nfs_set_inode_stale_locked(inode);
+ spin_unlock(&inode->i_lock);
+}
+
+struct nfs_find_desc {
+ struct nfs_fh *fh;
+ struct nfs_fattr *fattr;
+};
+
+/*
+ * In NFSv3 we can have 64bit inode numbers. In order to support
+ * this, and re-exported directories (also seen in NFSv2)
+ * we are forced to allow 2 different inodes to have the same
+ * i_ino.
+ */
+static int
+nfs_find_actor(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = opaque;
+ struct nfs_fh *fh = desc->fh;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ if (NFS_FILEID(inode) != fattr->fileid)
+ return 0;
+ if (inode_wrong_type(inode, fattr->mode))
+ return 0;
+ if (nfs_compare_fh(NFS_FH(inode), fh))
+ return 0;
+ if (is_bad_inode(inode) || NFS_STALE(inode))
+ return 0;
+ return 1;
+}
+
+static int
+nfs_init_locked(struct inode *inode, void *opaque)
+{
+ struct nfs_find_desc *desc = opaque;
+ struct nfs_fattr *fattr = desc->fattr;
+
+ set_nfs_fileid(inode, fattr->fileid);
+ inode->i_mode = fattr->mode;
+ nfs_copy_fh(NFS_FH(inode), desc->fh);
+ return 0;
+}
+
+#ifdef CONFIG_NFS_V4_SECURITY_LABEL
+static void nfs_clear_label_invalid(struct inode *inode)
+{
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
+ spin_unlock(&inode->i_lock);
+}
+
+void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
+{
+ int error;
+
+ if (fattr->label == NULL)
+ return;
+
+ if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
+ error = security_inode_notifysecctx(inode, fattr->label->label,
+ fattr->label->len);
+ if (error)
+ printk(KERN_ERR "%s() %s %d "
+ "security_inode_notifysecctx() %d\n",
+ __func__,
+ (char *)fattr->label->label,
+ fattr->label->len, error);
+ nfs_clear_label_invalid(inode);
+ }
+}
+
+struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
+{
+ struct nfs4_label *label;
+
+ if (!(server->caps & NFS_CAP_SECURITY_LABEL))
+ return NULL;
+
+ label = kzalloc(sizeof(struct nfs4_label), flags);
+ if (label == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ label->label = kzalloc(NFS4_MAXLABELLEN, flags);
+ if (label->label == NULL) {
+ kfree(label);
+ return ERR_PTR(-ENOMEM);
+ }
+ label->len = NFS4_MAXLABELLEN;
+
+ return label;
+}
+EXPORT_SYMBOL_GPL(nfs4_label_alloc);
+#else
+void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
+{
+}
+#endif
+EXPORT_SYMBOL_GPL(nfs_setsecurity);
+
+/* Search for inode identified by fh, fileid and i_mode in inode cache. */
+struct inode *
+nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
+{
+ struct nfs_find_desc desc = {
+ .fh = fh,
+ .fattr = fattr,
+ };
+ struct inode *inode;
+ unsigned long hash;
+
+ if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
+ !(fattr->valid & NFS_ATTR_FATTR_TYPE))
+ return NULL;
+
+ hash = nfs_fattr_to_ino_t(fattr);
+ inode = ilookup5(sb, hash, nfs_find_actor, &desc);
+
+ dprintk("%s: returning %p\n", __func__, inode);
+ return inode;
+}
+
+static void nfs_inode_init_regular(struct nfs_inode *nfsi)
+{
+ atomic_long_set(&nfsi->nrequests, 0);
+ atomic_long_set(&nfsi->redirtied_pages, 0);
+ INIT_LIST_HEAD(&nfsi->commit_info.list);
+ atomic_long_set(&nfsi->commit_info.ncommit, 0);
+ atomic_set(&nfsi->commit_info.rpcs_out, 0);
+ mutex_init(&nfsi->commit_mutex);
+}
+
+static void nfs_inode_init_dir(struct nfs_inode *nfsi)
+{
+ nfsi->cache_change_attribute = 0;
+ memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
+ init_rwsem(&nfsi->rmdir_sem);
+}
+
+/*
+ * This is our front-end to iget that looks up inodes by file handle
+ * instead of inode number.
+ */
+struct inode *
+nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
+{
+ struct nfs_find_desc desc = {
+ .fh = fh,
+ .fattr = fattr
+ };
+ struct inode *inode = ERR_PTR(-ENOENT);
+ u64 fattr_supported = NFS_SB(sb)->fattr_valid;
+ unsigned long hash;
+
+ nfs_attr_check_mountpoint(sb, fattr);
+
+ if (nfs_attr_use_mounted_on_fileid(fattr))
+ fattr->fileid = fattr->mounted_on_fileid;
+ else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
+ goto out_no_inode;
+ if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
+ goto out_no_inode;
+
+ hash = nfs_fattr_to_ino_t(fattr);
+
+ inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
+ if (inode == NULL) {
+ inode = ERR_PTR(-ENOMEM);
+ goto out_no_inode;
+ }
+
+ if (inode->i_state & I_NEW) {
+ struct nfs_inode *nfsi = NFS_I(inode);
+ unsigned long now = jiffies;
+
+ /* We set i_ino for the few things that still rely on it,
+ * such as stat(2) */
+ inode->i_ino = hash;
+
+ /* We can't support update_atime(), since the server will reset it */
+ inode->i_flags |= S_NOATIME|S_NOCMTIME;
+ inode->i_mode = fattr->mode;
+ nfsi->cache_validity = 0;
+ if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
+ && (fattr_supported & NFS_ATTR_FATTR_MODE))
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
+ /* Why so? Because we want revalidate for devices/FIFOs, and
+ * that's precisely what we have in nfs_file_inode_operations.
+ */
+ inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
+ if (S_ISREG(inode->i_mode)) {
+ inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
+ inode->i_data.a_ops = &nfs_file_aops;
+ nfs_inode_init_regular(nfsi);
+ } else if (S_ISDIR(inode->i_mode)) {
+ inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
+ inode->i_fop = &nfs_dir_operations;
+ inode->i_data.a_ops = &nfs_dir_aops;
+ nfs_inode_init_dir(nfsi);
+ /* Deal with crossing mountpoints */
+ if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
+ fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
+ if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
+ inode->i_op = &nfs_referral_inode_operations;
+ else
+ inode->i_op = &nfs_mountpoint_inode_operations;
+ inode->i_fop = NULL;
+ inode->i_flags |= S_AUTOMOUNT;
+ }
+ } else if (S_ISLNK(inode->i_mode)) {
+ inode->i_op = &nfs_symlink_inode_operations;
+ inode_nohighmem(inode);
+ } else
+ init_special_inode(inode, inode->i_mode, fattr->rdev);
+
+ memset(&inode->i_atime, 0, sizeof(inode->i_atime));
+ memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
+ inode_set_ctime(inode, 0, 0);
+ inode_set_iversion_raw(inode, 0);
+ inode->i_size = 0;
+ clear_nlink(inode);
+ inode->i_uid = make_kuid(&init_user_ns, -2);
+ inode->i_gid = make_kgid(&init_user_ns, -2);
+ inode->i_blocks = 0;
+ nfsi->write_io = 0;
+ nfsi->read_io = 0;
+
+ nfsi->read_cache_jiffies = fattr->time_start;
+ nfsi->attr_gencount = fattr->gencount;
+ if (fattr->valid & NFS_ATTR_FATTR_ATIME)
+ inode->i_atime = fattr->atime;
+ else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
+ if (fattr->valid & NFS_ATTR_FATTR_MTIME)
+ inode->i_mtime = fattr->mtime;
+ else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
+ if (fattr->valid & NFS_ATTR_FATTR_CTIME)
+ inode_set_ctime_to_ts(inode, fattr->ctime);
+ else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
+ if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
+ inode_set_iversion_raw(inode, fattr->change_attr);
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
+ if (fattr->valid & NFS_ATTR_FATTR_SIZE)
+ inode->i_size = nfs_size_to_loff_t(fattr->size);
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
+ if (fattr->valid & NFS_ATTR_FATTR_NLINK)
+ set_nlink(inode, fattr->nlink);
+ else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
+ if (fattr->valid & NFS_ATTR_FATTR_OWNER)
+ inode->i_uid = fattr->uid;
+ else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
+ if (fattr->valid & NFS_ATTR_FATTR_GROUP)
+ inode->i_gid = fattr->gid;
+ else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
+ if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
+ inode->i_blocks = fattr->du.nfs2.blocks;
+ else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
+ fattr->size != 0)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
+ if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
+ /*
+ * report the blocks in 512byte units
+ */
+ inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
+ } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
+ fattr->size != 0)
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
+
+ nfs_setsecurity(inode, fattr);
+
+ nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+ nfsi->attrtimeo_timestamp = now;
+ nfsi->access_cache = RB_ROOT;
+
+ nfs_fscache_init_inode(inode);
+
+ unlock_new_inode(inode);
+ } else {
+ int err = nfs_refresh_inode(inode, fattr);
+ if (err < 0) {
+ iput(inode);
+ inode = ERR_PTR(err);
+ goto out_no_inode;
+ }
+ }
+ dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
+ inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(inode),
+ nfs_display_fhandle_hash(fh),
+ atomic_read(&inode->i_count));
+
+out:
+ return inode;
+
+out_no_inode:
+ dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
+ goto out;
+}
+EXPORT_SYMBOL_GPL(nfs_fhget);
+
+#define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
+
+int
+nfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+ struct iattr *attr)
+{
+ struct inode *inode = d_inode(dentry);
+ struct nfs_fattr *fattr;
+ int error = 0;
+
+ nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
+
+ /* skip mode change if it's just for clearing setuid/setgid */
+ if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
+ attr->ia_valid &= ~ATTR_MODE;
+
+ if (attr->ia_valid & ATTR_SIZE) {
+ BUG_ON(!S_ISREG(inode->i_mode));
+
+ error = inode_newsize_ok(inode, attr->ia_size);
+ if (error)
+ return error;
+
+ if (attr->ia_size == i_size_read(inode))
+ attr->ia_valid &= ~ATTR_SIZE;
+ }
+
+ /* Optimization: if the end result is no change, don't RPC */
+ if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
+ return 0;
+
+ trace_nfs_setattr_enter(inode);
+
+ /* Write all dirty data */
+ if (S_ISREG(inode->i_mode))
+ nfs_sync_inode(inode);
+
+ fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
+ if (fattr == NULL) {
+ error = -ENOMEM;
+ goto out;
+ }
+
+ error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
+ if (error == 0)
+ error = nfs_refresh_inode(inode, fattr);
+ nfs_free_fattr(fattr);
+out:
+ trace_nfs_setattr_exit(inode, error);
+ return error;
+}
+EXPORT_SYMBOL_GPL(nfs_setattr);
+
+/**
+ * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
+ * @inode: inode of the file used
+ * @offset: file offset to start truncating
+ *
+ * This is a copy of the common vmtruncate, but with the locking
+ * corrected to take into account the fact that NFS requires
+ * inode->i_size to be updated under the inode->i_lock.
+ * Note: must be called with inode->i_lock held!
+ */
+static int nfs_vmtruncate(struct inode * inode, loff_t offset)
+{
+ int err;
+
+ err = inode_newsize_ok(inode, offset);
+ if (err)
+ goto out;
+
+ trace_nfs_size_truncate(inode, offset);
+ i_size_write(inode, offset);
+ /* Optimisation */
+ if (offset == 0) {
+ NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
+ nfs_ooo_clear(NFS_I(inode));
+ }
+ NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
+
+ spin_unlock(&inode->i_lock);
+ truncate_pagecache(inode, offset);
+ spin_lock(&inode->i_lock);
+out:
+ return err;
+}
+
+/**
+ * nfs_setattr_update_inode - Update inode metadata after a setattr call.
+ * @inode: pointer to struct inode
+ * @attr: pointer to struct iattr
+ * @fattr: pointer to struct nfs_fattr
+ *
+ * Note: we do this in the *proc.c in order to ensure that
+ * it works for things like exclusive creates too.
+ */
+void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
+ struct nfs_fattr *fattr)
+{
+ /* Barrier: bump the attribute generation count. */
+ nfs_fattr_set_barrier(fattr);
+
+ spin_lock(&inode->i_lock);
+ NFS_I(inode)->attr_gencount = fattr->gencount;
+ if ((attr->ia_valid & ATTR_SIZE) != 0) {
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME |
+ NFS_INO_INVALID_BLOCKS);
+ nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
+ nfs_vmtruncate(inode, attr->ia_size);
+ }
+ if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
+ NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
+ if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
+ inode->i_mode & S_ISUID)
+ inode->i_mode &= ~S_ISUID;
+ if (setattr_should_drop_sgid(&nop_mnt_idmap, inode))
+ inode->i_mode &= ~S_ISGID;
+ if ((attr->ia_valid & ATTR_MODE) != 0) {
+ int mode = attr->ia_mode & S_IALLUGO;
+ mode |= inode->i_mode & ~S_IALLUGO;
+ inode->i_mode = mode;
+ }
+ if ((attr->ia_valid & ATTR_UID) != 0)
+ inode->i_uid = attr->ia_uid;
+ if ((attr->ia_valid & ATTR_GID) != 0)
+ inode->i_gid = attr->ia_gid;
+ if (fattr->valid & NFS_ATTR_FATTR_CTIME)
+ inode_set_ctime_to_ts(inode, fattr->ctime);
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
+ | NFS_INO_INVALID_CTIME);
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
+ | NFS_INO_INVALID_ACL);
+ }
+ if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
+ NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
+ | NFS_INO_INVALID_CTIME);
+ if (fattr->valid & NFS_ATTR_FATTR_ATIME)
+ inode->i_atime = fattr->atime;
+ else if (attr->ia_valid & ATTR_ATIME_SET)
+ inode->i_atime = attr->ia_atime;
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
+
+ if (fattr->valid & NFS_ATTR_FATTR_CTIME)
+ inode_set_ctime_to_ts(inode, fattr->ctime);
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
+ | NFS_INO_INVALID_CTIME);
+ }
+ if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
+ NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
+ | NFS_INO_INVALID_CTIME);
+ if (fattr->valid & NFS_ATTR_FATTR_MTIME)
+ inode->i_mtime = fattr->mtime;
+ else if (attr->ia_valid & ATTR_MTIME_SET)
+ inode->i_mtime = attr->ia_mtime;
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
+
+ if (fattr->valid & NFS_ATTR_FATTR_CTIME)
+ inode_set_ctime_to_ts(inode, fattr->ctime);
+ else
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
+ | NFS_INO_INVALID_CTIME);
+ }
+ if (fattr->valid)
+ nfs_update_inode(inode, fattr);
+ spin_unlock(&inode->i_lock);
+}
+EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
+
+/*
+ * Don't request help from readdirplus if the file is being written to,
+ * or if attribute caching is turned off
+ */
+static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
+{
+ return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
+ !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
+}
+
+static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
+{
+ if (!IS_ROOT(dentry)) {
+ struct dentry *parent = dget_parent(dentry);
+ nfs_readdir_record_entry_cache_miss(d_inode(parent));
+ dput(parent);
+ }
+}
+
+static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
+{
+ if (!IS_ROOT(dentry)) {
+ struct dentry *parent = dget_parent(dentry);
+ nfs_readdir_record_entry_cache_hit(d_inode(parent));
+ dput(parent);
+ }
+}
+
+static u32 nfs_get_valid_attrmask(struct inode *inode)
+{
+ unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
+ u32 reply_mask = STATX_INO | STATX_TYPE;
+
+ if (!(cache_validity & NFS_INO_INVALID_ATIME))
+ reply_mask |= STATX_ATIME;
+ if (!(cache_validity & NFS_INO_INVALID_CTIME))
+ reply_mask |= STATX_CTIME;
+ if (!(cache_validity & NFS_INO_INVALID_MTIME))
+ reply_mask |= STATX_MTIME;
+ if (!(cache_validity & NFS_INO_INVALID_SIZE))
+ reply_mask |= STATX_SIZE;
+ if (!(cache_validity & NFS_INO_INVALID_NLINK))
+ reply_mask |= STATX_NLINK;
+ if (!(cache_validity & NFS_INO_INVALID_MODE))
+ reply_mask |= STATX_MODE;
+ if (!(cache_validity & NFS_INO_INVALID_OTHER))
+ reply_mask |= STATX_UID | STATX_GID;
+ if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
+ reply_mask |= STATX_BLOCKS;
+ if (!(cache_validity & NFS_INO_INVALID_CHANGE))
+ reply_mask |= STATX_CHANGE_COOKIE;
+ return reply_mask;
+}
+
+int nfs_getattr(struct mnt_idmap *idmap, const struct path *path,
+ struct kstat *stat, u32 request_mask, unsigned int query_flags)
+{
+ struct inode *inode = d_inode(path->dentry);
+ struct nfs_server *server = NFS_SERVER(inode);
+ unsigned long cache_validity;
+ int err = 0;
+ bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
+ bool do_update = false;
+ bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
+
+ trace_nfs_getattr_enter(inode);
+
+ request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
+ STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
+ STATX_INO | STATX_SIZE | STATX_BLOCKS |
+ STATX_CHANGE_COOKIE;
+
+ if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
+ if (readdirplus_enabled)
+ nfs_readdirplus_parent_cache_hit(path->dentry);
+ goto out_no_revalidate;
+ }
+
+ /* Flush out writes to the server in order to update c/mtime/version. */
+ if ((request_mask & (STATX_CTIME | STATX_MTIME | STATX_CHANGE_COOKIE)) &&
+ S_ISREG(inode->i_mode))
+ filemap_write_and_wait(inode->i_mapping);
+
+ /*
+ * We may force a getattr if the user cares about atime.
+ *
+ * Note that we only have to check the vfsmount flags here:
+ * - NFS always sets S_NOATIME by so checking it would give a
+ * bogus result
+ * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
+ * no point in checking those.
+ */
+ if ((path->mnt->mnt_flags & MNT_NOATIME) ||
+ ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
+ request_mask &= ~STATX_ATIME;
+
+ /* Is the user requesting attributes that might need revalidation? */
+ if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
+ STATX_MTIME|STATX_UID|STATX_GID|
+ STATX_SIZE|STATX_BLOCKS|
+ STATX_CHANGE_COOKIE)))
+ goto out_no_revalidate;
+
+ /* Check whether the cached attributes are stale */
+ do_update |= force_sync || nfs_attribute_cache_expired(inode);
+ cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
+ do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
+ if (request_mask & STATX_ATIME)
+ do_update |= cache_validity & NFS_INO_INVALID_ATIME;
+ if (request_mask & STATX_CTIME)
+ do_update |= cache_validity & NFS_INO_INVALID_CTIME;
+ if (request_mask & STATX_MTIME)
+ do_update |= cache_validity & NFS_INO_INVALID_MTIME;
+ if (request_mask & STATX_SIZE)
+ do_update |= cache_validity & NFS_INO_INVALID_SIZE;
+ if (request_mask & STATX_NLINK)
+ do_update |= cache_validity & NFS_INO_INVALID_NLINK;
+ if (request_mask & STATX_MODE)
+ do_update |= cache_validity & NFS_INO_INVALID_MODE;
+ if (request_mask & (STATX_UID | STATX_GID))
+ do_update |= cache_validity & NFS_INO_INVALID_OTHER;
+ if (request_mask & STATX_BLOCKS)
+ do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
+
+ if (do_update) {
+ if (readdirplus_enabled)
+ nfs_readdirplus_parent_cache_miss(path->dentry);
+ err = __nfs_revalidate_inode(server, inode);
+ if (err)
+ goto out;
+ } else if (readdirplus_enabled)
+ nfs_readdirplus_parent_cache_hit(path->dentry);
+out_no_revalidate:
+ /* Only return attributes that were revalidated. */
+ stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
+
+ generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
+ stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
+ stat->change_cookie = inode_peek_iversion_raw(inode);
+ stat->attributes_mask |= STATX_ATTR_CHANGE_MONOTONIC;
+ if (server->change_attr_type != NFS4_CHANGE_TYPE_IS_UNDEFINED)
+ stat->attributes |= STATX_ATTR_CHANGE_MONOTONIC;
+ if (S_ISDIR(inode->i_mode))
+ stat->blksize = NFS_SERVER(inode)->dtsize;
+out:
+ trace_nfs_getattr_exit(inode, err);
+ return err;
+}
+EXPORT_SYMBOL_GPL(nfs_getattr);
+
+static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
+{
+ refcount_set(&l_ctx->count, 1);
+ l_ctx->lockowner = current->files;
+ INIT_LIST_HEAD(&l_ctx->list);
+ atomic_set(&l_ctx->io_count, 0);
+}
+
+static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
+{
+ struct nfs_lock_context *pos;
+
+ list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
+ if (pos->lockowner != current->files)
+ continue;
+ if (refcount_inc_not_zero(&pos->count))
+ return pos;
+ }
+ return NULL;
+}
+
+struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
+{
+ struct nfs_lock_context *res, *new = NULL;
+ struct inode *inode = d_inode(ctx->dentry);
+
+ rcu_read_lock();
+ res = __nfs_find_lock_context(ctx);
+ rcu_read_unlock();
+ if (res == NULL) {
+ new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
+ if (new == NULL)
+ return ERR_PTR(-ENOMEM);
+ nfs_init_lock_context(new);
+ spin_lock(&inode->i_lock);
+ res = __nfs_find_lock_context(ctx);
+ if (res == NULL) {
+ new->open_context = get_nfs_open_context(ctx);
+ if (new->open_context) {
+ list_add_tail_rcu(&new->list,
+ &ctx->lock_context.list);
+ res = new;
+ new = NULL;
+ } else
+ res = ERR_PTR(-EBADF);
+ }
+ spin_unlock(&inode->i_lock);
+ kfree(new);
+ }
+ return res;
+}
+EXPORT_SYMBOL_GPL(nfs_get_lock_context);
+
+void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
+{
+ struct nfs_open_context *ctx = l_ctx->open_context;
+ struct inode *inode = d_inode(ctx->dentry);
+
+ if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
+ return;
+ list_del_rcu(&l_ctx->list);
+ spin_unlock(&inode->i_lock);
+ put_nfs_open_context(ctx);
+ kfree_rcu(l_ctx, rcu_head);
+}
+EXPORT_SYMBOL_GPL(nfs_put_lock_context);
+
+/**
+ * nfs_close_context - Common close_context() routine NFSv2/v3
+ * @ctx: pointer to context
+ * @is_sync: is this a synchronous close
+ *
+ * Ensure that the attributes are up to date if we're mounted
+ * with close-to-open semantics and we have cached data that will
+ * need to be revalidated on open.
+ */
+void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
+{
+ struct nfs_inode *nfsi;
+ struct inode *inode;
+
+ if (!(ctx->mode & FMODE_WRITE))
+ return;
+ if (!is_sync)
+ return;
+ inode = d_inode(ctx->dentry);
+ if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
+ return;
+ nfsi = NFS_I(inode);
+ if (inode->i_mapping->nrpages == 0)
+ return;
+ if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
+ return;
+ if (!list_empty(&nfsi->open_files))
+ return;
+ if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
+ return;
+ nfs_revalidate_inode(inode,
+ NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
+}
+EXPORT_SYMBOL_GPL(nfs_close_context);
+
+struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
+ fmode_t f_mode,
+ struct file *filp)
+{
+ struct nfs_open_context *ctx;
+
+ ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
+ if (!ctx)
+ return ERR_PTR(-ENOMEM);
+ nfs_sb_active(dentry->d_sb);
+ ctx->dentry = dget(dentry);
+ if (filp)
+ ctx->cred = get_cred(filp->f_cred);
+ else
+ ctx->cred = get_current_cred();
+ rcu_assign_pointer(ctx->ll_cred, NULL);
+ ctx->state = NULL;
+ ctx->mode = f_mode;
+ ctx->flags = 0;
+ ctx->error = 0;
+ ctx->flock_owner = (fl_owner_t)filp;
+ nfs_init_lock_context(&ctx->lock_context);
+ ctx->lock_context.open_context = ctx;
+ INIT_LIST_HEAD(&ctx->list);
+ ctx->mdsthreshold = NULL;
+ return ctx;
+}
+EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
+
+struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
+{
+ if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
+ return ctx;
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(get_nfs_open_context);
+
+static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
+{
+ struct inode *inode = d_inode(ctx->dentry);
+ struct super_block *sb = ctx->dentry->d_sb;
+
+ if (!refcount_dec_and_test(&ctx->lock_context.count))
+ return;
+ if (!list_empty(&ctx->list)) {
+ spin_lock(&inode->i_lock);
+ list_del_rcu(&ctx->list);
+ spin_unlock(&inode->i_lock);
+ }
+ if (inode != NULL)
+ NFS_PROTO(inode)->close_context(ctx, is_sync);
+ put_cred(ctx->cred);
+ dput(ctx->dentry);
+ nfs_sb_deactive(sb);
+ put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
+ kfree(ctx->mdsthreshold);
+ kfree_rcu(ctx, rcu_head);
+}
+
+void put_nfs_open_context(struct nfs_open_context *ctx)
+{
+ __put_nfs_open_context(ctx, 0);
+}
+EXPORT_SYMBOL_GPL(put_nfs_open_context);
+
+static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
+{
+ __put_nfs_open_context(ctx, 1);
+}
+
+/*
+ * Ensure that mmap has a recent RPC credential for use when writing out
+ * shared pages
+ */
+void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
+{
+ struct inode *inode = d_inode(ctx->dentry);
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ spin_lock(&inode->i_lock);
+ if (list_empty(&nfsi->open_files) &&
+ nfs_ooo_test(nfsi))
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
+ NFS_INO_REVAL_FORCED);
+ list_add_tail_rcu(&ctx->list, &nfsi->open_files);
+ spin_unlock(&inode->i_lock);
+}
+EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
+
+void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
+{
+ filp->private_data = get_nfs_open_context(ctx);
+ set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
+ if (list_empty(&ctx->list))
+ nfs_inode_attach_open_context(ctx);
+}
+EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
+
+/*
+ * Given an inode, search for an open context with the desired characteristics
+ */
+struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs_open_context *pos, *ctx = NULL;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
+ if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
+ continue;
+ if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
+ continue;
+ if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
+ continue;
+ ctx = get_nfs_open_context(pos);
+ if (ctx)
+ break;
+ }
+ rcu_read_unlock();
+ return ctx;
+}
+
+void nfs_file_clear_open_context(struct file *filp)
+{
+ struct nfs_open_context *ctx = nfs_file_open_context(filp);
+
+ if (ctx) {
+ struct inode *inode = d_inode(ctx->dentry);
+
+ clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
+ /*
+ * We fatal error on write before. Try to writeback
+ * every page again.
+ */
+ if (ctx->error < 0)
+ invalidate_inode_pages2(inode->i_mapping);
+ filp->private_data = NULL;
+ put_nfs_open_context_sync(ctx);
+ }
+}
+
+/*
+ * These allocate and release file read/write context information.
+ */
+int nfs_open(struct inode *inode, struct file *filp)
+{
+ struct nfs_open_context *ctx;
+
+ ctx = alloc_nfs_open_context(file_dentry(filp),
+ flags_to_mode(filp->f_flags), filp);
+ if (IS_ERR(ctx))
+ return PTR_ERR(ctx);
+ nfs_file_set_open_context(filp, ctx);
+ put_nfs_open_context(ctx);
+ nfs_fscache_open_file(inode, filp);
+ return 0;
+}
+
+/*
+ * This function is called whenever some part of NFS notices that
+ * the cached attributes have to be refreshed.
+ */
+int
+__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
+{
+ int status = -ESTALE;
+ struct nfs_fattr *fattr = NULL;
+ struct nfs_inode *nfsi = NFS_I(inode);
+
+ dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
+ inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
+
+ trace_nfs_revalidate_inode_enter(inode);
+
+ if (is_bad_inode(inode))
+ goto out;
+ if (NFS_STALE(inode))
+ goto out;
+
+ /* pNFS: Attributes aren't updated until we layoutcommit */
+ if (S_ISREG(inode->i_mode)) {
+ status = pnfs_sync_inode(inode, false);
+ if (status)
+ goto out;
+ }
+
+ status = -ENOMEM;
+ fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
+ if (fattr == NULL)
+ goto out;
+
+ nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
+
+ status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
+ if (status != 0) {
+ dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
+ inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(inode), status);
+ switch (status) {
+ case -ETIMEDOUT:
+ /* A soft timeout occurred. Use cached information? */
+ if (server->flags & NFS_MOUNT_SOFTREVAL)
+ status = 0;
+ break;
+ case -ESTALE:
+ if (!S_ISDIR(inode->i_mode))
+ nfs_set_inode_stale(inode);
+ else
+ nfs_zap_caches(inode);
+ }
+ goto out;
+ }
+
+ status = nfs_refresh_inode(inode, fattr);
+ if (status) {
+ dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
+ inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(inode), status);
+ goto out;
+ }
+
+ if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
+ nfs_zap_acl_cache(inode);
+
+ nfs_setsecurity(inode, fattr);
+
+ dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
+ inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(inode));
+
+out:
+ nfs_free_fattr(fattr);
+ trace_nfs_revalidate_inode_exit(inode, status);
+ return status;
+}
+
+int nfs_attribute_cache_expired(struct inode *inode)
+{
+ if (nfs_have_delegated_attributes(inode))
+ return 0;
+ return nfs_attribute_timeout(inode);
+}
+
+/**
+ * nfs_revalidate_inode - Revalidate the inode attributes
+ * @inode: pointer to inode struct
+ * @flags: cache flags to check
+ *
+ * Updates inode attribute information by retrieving the data from the server.
+ */
+int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
+{
+ if (!nfs_check_cache_invalid(inode, flags))
+ return NFS_STALE(inode) ? -ESTALE : 0;
+ return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+}
+EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
+
+static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
+{
+ int ret;
+
+ nfs_fscache_invalidate(inode, 0);
+ if (mapping->nrpages != 0) {
+ if (S_ISREG(inode->i_mode)) {
+ ret = nfs_sync_mapping(mapping);
+ if (ret < 0)
+ return ret;
+ }
+ ret = invalidate_inode_pages2(mapping);
+ if (ret < 0)
+ return ret;
+ }
+ nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
+
+ dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
+ inode->i_sb->s_id,
+ (unsigned long long)NFS_FILEID(inode));
+ return 0;
+}
+
+/**
+ * nfs_clear_invalid_mapping - Conditionally clear a mapping
+ * @mapping: pointer to mapping
+ *
+ * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
+ */
+int nfs_clear_invalid_mapping(struct address_space *mapping)
+{
+ struct inode *inode = mapping->host;
+ struct nfs_inode *nfsi = NFS_I(inode);
+ unsigned long *bitlock = &nfsi->flags;
+ int ret = 0;
+
+ /*
+ * We must clear NFS_INO_INVALID_DATA first to ensure that
+ * invalidations that come in while we're shooting down the mappings
+ * are respected. But, that leaves a race window where one revalidator
+ * can clear the flag, and then another checks it before the mapping
+ * gets invalidated. Fix that by serializing access to this part of
+ * the function.
+ *
+ * At the same time, we need to allow other tasks to see whether we
+ * might be in the middle of invalidating the pages, so we only set
+ * the bit lock here if it looks like we're going to be doing that.
+ */
+ for (;;) {
+ ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
+ nfs_wait_bit_killable,
+ TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
+ if (ret)
+ goto out;
+ spin_lock(&inode->i_lock);
+ if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
+ spin_unlock(&inode->i_lock);
+ continue;
+ }
+ if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
+ break;
+ spin_unlock(&inode->i_lock);
+ goto out;
+ }
+
+ set_bit(NFS_INO_INVALIDATING, bitlock);
+ smp_wmb();
+ nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
+ nfs_ooo_clear(nfsi);
+ spin_unlock(&inode->i_lock);
+ trace_nfs_invalidate_mapping_enter(inode);
+ ret = nfs_invalidate_mapping(inode, mapping);
+ trace_nfs_invalidate_mapping_exit(inode, ret);
+
+ clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
+ smp_mb__after_atomic();
+ wake_up_bit(bitlock, NFS_INO_INVALIDATING);
+out:
+ return ret;
+}
+
+bool nfs_mapping_need_revalidate_inode(struct inode *inode)
+{
+ return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
+ NFS_STALE(inode);
+}
+
+int nfs_revalidate_mapping_rcu(struct inode *inode)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ unsigned long *bitlock = &nfsi->flags;
+ int ret = 0;
+
+ if (IS_SWAPFILE(inode))
+ goto out;
+ if (nfs_mapping_need_revalidate_inode(inode)) {
+ ret = -ECHILD;
+ goto out;
+ }
+ spin_lock(&inode->i_lock);
+ if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
+ (nfsi->cache_validity & NFS_INO_INVALID_DATA))
+ ret = -ECHILD;
+ spin_unlock(&inode->i_lock);
+out:
+ return ret;
+}
+
+/**
+ * nfs_revalidate_mapping - Revalidate the pagecache
+ * @inode: pointer to host inode
+ * @mapping: pointer to mapping
+ */
+int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
+{
+ /* swapfiles are not supposed to be shared. */
+ if (IS_SWAPFILE(inode))
+ return 0;
+
+ if (nfs_mapping_need_revalidate_inode(inode)) {
+ int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
+ if (ret < 0)
+ return ret;
+ }
+
+ return nfs_clear_invalid_mapping(mapping);
+}
+
+static bool nfs_file_has_writers(struct nfs_inode *nfsi)
+{
+ struct inode *inode = &nfsi->vfs_inode;
+
+ if (!S_ISREG(inode->i_mode))
+ return false;
+ if (list_empty(&nfsi->open_files))
+ return false;
+ return inode_is_open_for_write(inode);
+}
+
+static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
+{
+ return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
+}
+
+static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct timespec64 ts;
+
+ if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
+ && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
+ && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
+ inode_set_iversion_raw(inode, fattr->change_attr);
+ if (S_ISDIR(inode->i_mode))
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
+ else if (nfs_server_capable(inode, NFS_CAP_XATTR))
+ nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
+ }
+ /* If we have atomic WCC data, we may update some attributes */
+ ts = inode_get_ctime(inode);
+ if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
+ && (fattr->valid & NFS_ATTR_FATTR_CTIME)
+ && timespec64_equal(&ts, &fattr->pre_ctime)) {
+ inode_set_ctime_to_ts(inode, fattr->ctime);
+ }
+
+ ts = inode->i_mtime;
+ if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
+ && (fattr->valid & NFS_ATTR_FATTR_MTIME)
+ && timespec64_equal(&ts, &fattr->pre_mtime)) {
+ inode->i_mtime = fattr->mtime;
+ }
+ if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
+ && (fattr->valid & NFS_ATTR_FATTR_SIZE)
+ && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
+ && !nfs_have_writebacks(inode)) {
+ trace_nfs_size_wcc(inode, fattr->size);
+ i_size_write(inode, nfs_size_to_loff_t(fattr->size));
+ }
+}
+
+/**
+ * nfs_check_inode_attributes - verify consistency of the inode attribute cache
+ * @inode: pointer to inode
+ * @fattr: updated attributes
+ *
+ * Verifies the attribute cache. If we have just changed the attributes,
+ * so that fattr carries weak cache consistency data, then it may
+ * also update the ctime/mtime/change_attribute.
+ */
+static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct nfs_inode *nfsi = NFS_I(inode);
+ loff_t cur_size, new_isize;
+ unsigned long invalid = 0;
+ struct timespec64 ts;
+
+ if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
+ return 0;
+
+ if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
+ /* Only a mounted-on-fileid? Just exit */
+ if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
+ return 0;
+ /* Has the inode gone and changed behind our back? */
+ } else if (nfsi->fileid != fattr->fileid) {
+ /* Is this perhaps the mounted-on fileid? */
+ if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
+ nfsi->fileid == fattr->mounted_on_fileid)
+ return 0;
+ return -ESTALE;
+ }
+ if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
+ return -ESTALE;
+
+
+ if (!nfs_file_has_buffered_writers(nfsi)) {
+ /* Verify a few of the more important attributes */
+ if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
+ invalid |= NFS_INO_INVALID_CHANGE;
+
+ ts = inode->i_mtime;
+ if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
+ invalid |= NFS_INO_INVALID_MTIME;
+
+ ts = inode_get_ctime(inode);
+ if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
+ invalid |= NFS_INO_INVALID_CTIME;
+
+ if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
+ cur_size = i_size_read(inode);
+ new_isize = nfs_size_to_loff_t(fattr->size);
+ if (cur_size != new_isize)
+ invalid |= NFS_INO_INVALID_SIZE;
+ }
+ }
+
+ /* Have any file permissions changed? */
+ if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
+ invalid |= NFS_INO_INVALID_MODE;
+ if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
+ invalid |= NFS_INO_INVALID_OTHER;
+ if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
+ invalid |= NFS_INO_INVALID_OTHER;
+
+ /* Has the link count changed? */
+ if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
+ invalid |= NFS_INO_INVALID_NLINK;
+
+ ts = inode->i_atime;
+ if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
+ invalid |= NFS_INO_INVALID_ATIME;
+
+ if (invalid != 0)
+ nfs_set_cache_invalid(inode, invalid);
+
+ nfsi->read_cache_jiffies = fattr->time_start;
+ return 0;
+}
+
+static atomic_long_t nfs_attr_generation_counter;
+
+static unsigned long nfs_read_attr_generation_counter(void)
+{
+ return atomic_long_read(&nfs_attr_generation_counter);
+}
+
+unsigned long nfs_inc_attr_generation_counter(void)
+{
+ return atomic_long_inc_return(&nfs_attr_generation_counter);
+}
+EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
+
+void nfs_fattr_init(struct nfs_fattr *fattr)
+{
+ fattr->valid = 0;
+ fattr->time_start = jiffies;
+ fattr->gencount = nfs_inc_attr_generation_counter();
+ fattr->owner_name = NULL;
+ fattr->group_name = NULL;
+}
+EXPORT_SYMBOL_GPL(nfs_fattr_init);
+
+/**
+ * nfs_fattr_set_barrier
+ * @fattr: attributes
+ *
+ * Used to set a barrier after an attribute was updated. This
+ * barrier ensures that older attributes from RPC calls that may
+ * have raced with our update cannot clobber these new values.
+ * Note that you are still responsible for ensuring that other
+ * operations which change the attribute on the server do not
+ * collide.
+ */
+void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
+{
+ fattr->gencount = nfs_inc_attr_generation_counter();
+}
+
+struct nfs_fattr *nfs_alloc_fattr(void)
+{
+ struct nfs_fattr *fattr;
+
+ fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
+ if (fattr != NULL) {
+ nfs_fattr_init(fattr);
+ fattr->label = NULL;
+ }
+ return fattr;
+}
+EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
+
+struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
+{
+ struct nfs_fattr *fattr = nfs_alloc_fattr();
+
+ if (!fattr)
+ return NULL;
+
+ fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
+ if (IS_ERR(fattr->label)) {
+ kfree(fattr);
+ return NULL;
+ }
+
+ return fattr;
+}
+EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
+
+struct nfs_fh *nfs_alloc_fhandle(void)
+{
+ struct nfs_fh *fh;
+
+ fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
+ if (fh != NULL)
+ fh->size = 0;
+ return fh;
+}
+EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
+
+#ifdef NFS_DEBUG
+/*
+ * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
+ * in the same way that wireshark does
+ *
+ * @fh: file handle
+ *
+ * For debugging only.
+ */
+u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
+{
+ /* wireshark uses 32-bit AUTODIN crc and does a bitwise
+ * not on the result */
+ return nfs_fhandle_hash(fh);
+}
+EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
+
+/*
+ * _nfs_display_fhandle - display an NFS file handle on the console
+ *
+ * @fh: file handle to display
+ * @caption: display caption
+ *
+ * For debugging only.
+ */
+void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
+{
+ unsigned short i;
+
+ if (fh == NULL || fh->size == 0) {
+ printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
+ return;
+ }
+
+ printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
+ caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
+ for (i = 0; i < fh->size; i += 16) {
+ __be32 *pos = (__be32 *)&fh->data[i];
+
+ switch ((fh->size - i - 1) >> 2) {
+ case 0:
+ printk(KERN_DEFAULT " %08x\n",
+ be32_to_cpup(pos));
+ break;
+ case 1:
+ printk(KERN_DEFAULT " %08x %08x\n",
+ be32_to_cpup(pos), be32_to_cpup(pos + 1));
+ break;
+ case 2:
+ printk(KERN_DEFAULT " %08x %08x %08x\n",
+ be32_to_cpup(pos), be32_to_cpup(pos + 1),
+ be32_to_cpup(pos + 2));
+ break;
+ default:
+ printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
+ be32_to_cpup(pos), be32_to_cpup(pos + 1),
+ be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
+ }
+ }
+}
+EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
+#endif
+
+/**
+ * nfs_inode_attrs_cmp_generic - compare attributes
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * Attempt to divine whether or not an RPC call reply carrying stale
+ * attributes got scheduled after another call carrying updated ones.
+ * Note also the check for wraparound of 'attr_gencount'
+ *
+ * The function returns '1' if it thinks the attributes in @fattr are
+ * more recent than the ones cached in @inode. Otherwise it returns
+ * the value '0'.
+ */
+static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
+ const struct inode *inode)
+{
+ unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
+
+ return (long)(fattr->gencount - attr_gencount) > 0 ||
+ (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
+}
+
+/**
+ * nfs_inode_attrs_cmp_monotonic - compare attributes
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * Attempt to divine whether or not an RPC call reply carrying stale
+ * attributes got scheduled after another call carrying updated ones.
+ *
+ * We assume that the server observes monotonic semantics for
+ * the change attribute, so a larger value means that the attributes in
+ * @fattr are more recent, in which case the function returns the
+ * value '1'.
+ * A return value of '0' indicates no measurable change
+ * A return value of '-1' means that the attributes in @inode are
+ * more recent.
+ */
+static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
+ const struct inode *inode)
+{
+ s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
+ if (diff > 0)
+ return 1;
+ return diff == 0 ? 0 : -1;
+}
+
+/**
+ * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * Attempt to divine whether or not an RPC call reply carrying stale
+ * attributes got scheduled after another call carrying updated ones.
+ *
+ * We assume that the server observes strictly monotonic semantics for
+ * the change attribute, so a larger value means that the attributes in
+ * @fattr are more recent, in which case the function returns the
+ * value '1'.
+ * A return value of '-1' means that the attributes in @inode are
+ * more recent or unchanged.
+ */
+static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
+ const struct inode *inode)
+{
+ return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
+}
+
+/**
+ * nfs_inode_attrs_cmp - compare attributes
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * This function returns '1' if it thinks the attributes in @fattr are
+ * more recent than the ones cached in @inode. It returns '-1' if
+ * the attributes in @inode are more recent than the ones in @fattr,
+ * and it returns 0 if not sure.
+ */
+static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
+ const struct inode *inode)
+{
+ if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
+ return 1;
+ switch (NFS_SERVER(inode)->change_attr_type) {
+ case NFS4_CHANGE_TYPE_IS_UNDEFINED:
+ break;
+ case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
+ if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
+ break;
+ return nfs_inode_attrs_cmp_monotonic(fattr, inode);
+ default:
+ if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
+ break;
+ return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
+ }
+ return 0;
+}
+
+/**
+ * nfs_inode_finish_partial_attr_update - complete a previous inode update
+ * @fattr: attributes
+ * @inode: pointer to inode
+ *
+ * Returns '1' if the last attribute update left the inode cached
+ * attributes in a partially unrevalidated state, and @fattr
+ * matches the change attribute of that partial update.
+ * Otherwise returns '0'.
+ */
+static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
+ const struct inode *inode)
+{
+ const unsigned long check_valid =
+ NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
+ NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
+ NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
+ NFS_INO_INVALID_NLINK;
+ unsigned long cache_validity = NFS_I(inode)->cache_validity;
+ enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
+
+ if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
+ !(cache_validity & NFS_INO_INVALID_CHANGE) &&
+ (cache_validity & check_valid) != 0 &&
+ (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
+ nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
+ return 1;
+ return 0;
+}
+
+static void nfs_ooo_merge(struct nfs_inode *nfsi,
+ u64 start, u64 end)
+{
+ int i, cnt;
+
+ if (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)
+ /* No point merging anything */
+ return;
+
+ if (!nfsi->ooo) {
+ nfsi->ooo = kmalloc(sizeof(*nfsi->ooo), GFP_ATOMIC);
+ if (!nfsi->ooo) {
+ nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
+ return;
+ }
+ nfsi->ooo->cnt = 0;
+ }
+
+ /* add this range, merging if possible */
+ cnt = nfsi->ooo->cnt;
+ for (i = 0; i < cnt; i++) {
+ if (end == nfsi->ooo->gap[i].start)
+ end = nfsi->ooo->gap[i].end;
+ else if (start == nfsi->ooo->gap[i].end)
+ start = nfsi->ooo->gap[i].start;
+ else
+ continue;
+ /* Remove 'i' from table and loop to insert the new range */
+ cnt -= 1;
+ nfsi->ooo->gap[i] = nfsi->ooo->gap[cnt];
+ i = -1;
+ }
+ if (start != end) {
+ if (cnt >= ARRAY_SIZE(nfsi->ooo->gap)) {
+ nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
+ kfree(nfsi->ooo);
+ nfsi->ooo = NULL;
+ return;
+ }
+ nfsi->ooo->gap[cnt].start = start;
+ nfsi->ooo->gap[cnt].end = end;
+ cnt += 1;
+ }
+ nfsi->ooo->cnt = cnt;
+}
+
+static void nfs_ooo_record(struct nfs_inode *nfsi,
+ struct nfs_fattr *fattr)
+{
+ /* This reply was out-of-order, so record in the
+ * pre/post change id, possibly cancelling
+ * gaps created when iversion was jumpped forward.
+ */
+ if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) &&
+ (fattr->valid & NFS_ATTR_FATTR_PRECHANGE))
+ nfs_ooo_merge(nfsi,
+ fattr->change_attr,
+ fattr->pre_change_attr);
+}
+
+static int nfs_refresh_inode_locked(struct inode *inode,
+ struct nfs_fattr *fattr)
+{
+ int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
+ int ret = 0;
+
+ trace_nfs_refresh_inode_enter(inode);
+
+ if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
+ ret = nfs_update_inode(inode, fattr);
+ else {
+ nfs_ooo_record(NFS_I(inode), fattr);
+
+ if (attr_cmp == 0)
+ ret = nfs_check_inode_attributes(inode, fattr);
+ }
+
+ trace_nfs_refresh_inode_exit(inode, ret);
+ return ret;
+}
+
+/**
+ * nfs_refresh_inode - try to update the inode attribute cache
+ * @inode: pointer to inode
+ * @fattr: updated attributes
+ *
+ * Check that an RPC call that returned attributes has not overlapped with
+ * other recent updates of the inode metadata, then decide whether it is
+ * safe to do a full update of the inode attributes, or whether just to
+ * call nfs_check_inode_attributes.
+ */
+int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ int status;
+
+ if ((fattr->valid & NFS_ATTR_FATTR) == 0)
+ return 0;
+ spin_lock(&inode->i_lock);
+ status = nfs_refresh_inode_locked(inode, fattr);
+ spin_unlock(&inode->i_lock);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(nfs_refresh_inode);
+
+static int nfs_post_op_update_inode_locked(struct inode *inode,
+ struct nfs_fattr *fattr, unsigned int invalid)
+{
+ if (S_ISDIR(inode->i_mode))
+ invalid |= NFS_INO_INVALID_DATA;
+ nfs_set_cache_invalid(inode, invalid);
+ if ((fattr->valid & NFS_ATTR_FATTR) == 0)
+ return 0;
+ return nfs_refresh_inode_locked(inode, fattr);
+}
+
+/**
+ * nfs_post_op_update_inode - try to update the inode attribute cache
+ * @inode: pointer to inode
+ * @fattr: updated attributes
+ *
+ * After an operation that has changed the inode metadata, mark the
+ * attribute cache as being invalid, then try to update it.
+ *
+ * NB: if the server didn't return any post op attributes, this
+ * function will force the retrieval of attributes before the next
+ * NFS request. Thus it should be used only for operations that
+ * are expected to change one or more attributes, to avoid
+ * unnecessary NFS requests and trips through nfs_update_inode().
+ */
+int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ int status;
+
+ spin_lock(&inode->i_lock);
+ nfs_fattr_set_barrier(fattr);
+ status = nfs_post_op_update_inode_locked(inode, fattr,
+ NFS_INO_INVALID_CHANGE
+ | NFS_INO_INVALID_CTIME
+ | NFS_INO_REVAL_FORCED);
+ spin_unlock(&inode->i_lock);
+
+ return status;
+}
+EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
+
+/**
+ * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
+ * @inode: pointer to inode
+ * @fattr: updated attributes
+ *
+ * After an operation that has changed the inode metadata, mark the
+ * attribute cache as being invalid, then try to update it. Fake up
+ * weak cache consistency data, if none exist.
+ *
+ * This function is mainly designed to be used by the ->write_done() functions.
+ */
+int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
+{
+ int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
+ int status;
+
+ /* Don't do a WCC update if these attributes are already stale */
+ if (attr_cmp < 0)
+ return 0;
+ if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
+ /* Record the pre/post change info before clearing PRECHANGE */
+ nfs_ooo_record(NFS_I(inode), fattr);
+ fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
+ | NFS_ATTR_FATTR_PRESIZE
+ | NFS_ATTR_FATTR_PREMTIME
+ | NFS_ATTR_FATTR_PRECTIME);
+ goto out_noforce;
+ }
+ if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
+ (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
+ fattr->pre_change_attr = inode_peek_iversion_raw(inode);
+ fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
+ }
+ if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
+ (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
+ fattr->pre_ctime = inode_get_ctime(inode);
+ fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
+ }
+ if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
+ (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
+ fattr->pre_mtime = inode->i_mtime;
+ fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
+ }
+ if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
+ (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
+ fattr->pre_size = i_size_read(inode);
+ fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
+ }
+out_noforce:
+ status = nfs_post_op_update_inode_locked(inode, fattr,
+ NFS_INO_INVALID_CHANGE
+ | NFS_INO_INVALID_CTIME
+ | NFS_INO_INVALID_MTIME
+ | NFS_INO_INVALID_BLOCKS);
+ return status;
+}
+
+/**
+ * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
+ * @inode: pointer to inode
+ * @fattr: updated attributes
+ *
+ * After an operation that has changed the inode metadata, mark the
+ * attribute cache as being invalid, then try to update it. Fake up
+ * weak cache consistency data, if none exist.
+ *
+ * This function is mainly designed to be used by the ->write_done() functions.
+ */
+int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
+{
+ int status;
+
+ spin_lock(&inode->i_lock);
+ nfs_fattr_set_barrier(fattr);
+ status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
+ spin_unlock(&inode->i_lock);
+ return status;
+}
+EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
+
+
+/*
+ * Many nfs protocol calls return the new file attributes after
+ * an operation. Here we update the inode to reflect the state
+ * of the server's inode.
+ *
+ * This is a bit tricky because we have to make sure all dirty pages
+ * have been sent off to the server before calling invalidate_inode_pages.
+ * To make sure no other process adds more write requests while we try
+ * our best to flush them, we make them sleep during the attribute refresh.
+ *
+ * A very similar scenario holds for the dir cache.
+ */
+static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
+{
+ struct nfs_server *server = NFS_SERVER(inode);
+ struct nfs_inode *nfsi = NFS_I(inode);
+ loff_t cur_isize, new_isize;
+ u64 fattr_supported = server->fattr_valid;
+ unsigned long invalid = 0;
+ unsigned long now = jiffies;
+ unsigned long save_cache_validity;
+ bool have_writers = nfs_file_has_buffered_writers(nfsi);
+ bool cache_revalidated = true;
+ bool attr_changed = false;
+ bool have_delegation;
+
+ dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
+ __func__, inode->i_sb->s_id, inode->i_ino,
+ nfs_display_fhandle_hash(NFS_FH(inode)),
+ atomic_read(&inode->i_count), fattr->valid);
+
+ if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
+ /* Only a mounted-on-fileid? Just exit */
+ if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
+ return 0;
+ /* Has the inode gone and changed behind our back? */
+ } else if (nfsi->fileid != fattr->fileid) {
+ /* Is this perhaps the mounted-on fileid? */
+ if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
+ nfsi->fileid == fattr->mounted_on_fileid)
+ return 0;
+ printk(KERN_ERR "NFS: server %s error: fileid changed\n"
+ "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
+ NFS_SERVER(inode)->nfs_client->cl_hostname,
+ inode->i_sb->s_id, (long long)nfsi->fileid,
+ (long long)fattr->fileid);
+ goto out_err;
+ }
+
+ /*
+ * Make sure the inode's type hasn't changed.
+ */
+ if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
+ /*
+ * Big trouble! The inode has become a different object.
+ */
+ printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
+ __func__, inode->i_ino, inode->i_mode, fattr->mode);
+ goto out_err;
+ }
+
+ /* Update the fsid? */
+ if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
+ !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
+ !IS_AUTOMOUNT(inode))
+ server->fsid = fattr->fsid;
+
+ /* Save the delegation state before clearing cache_validity */
+ have_delegation = nfs_have_delegated_attributes(inode);
+
+ /*
+ * Update the read time so we don't revalidate too often.
+ */
+ nfsi->read_cache_jiffies = fattr->time_start;
+
+ save_cache_validity = nfsi->cache_validity;
+ nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
+ | NFS_INO_INVALID_ATIME
+ | NFS_INO_REVAL_FORCED
+ | NFS_INO_INVALID_BLOCKS);
+
+ /* Do atomic weak cache consistency updates */
+ nfs_wcc_update_inode(inode, fattr);
+
+ if (pnfs_layoutcommit_outstanding(inode)) {
+ nfsi->cache_validity |=
+ save_cache_validity &
+ (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
+ NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
+ NFS_INO_INVALID_BLOCKS);
+ cache_revalidated = false;
+ }
+
+ /* More cache consistency checks */
+ if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
+ if (!have_writers && nfsi->ooo && nfsi->ooo->cnt == 1 &&
+ nfsi->ooo->gap[0].end == inode_peek_iversion_raw(inode)) {
+ /* There is one remaining gap that hasn't been
+ * merged into iversion - do that now.
+ */
+ inode_set_iversion_raw(inode, nfsi->ooo->gap[0].start);
+ kfree(nfsi->ooo);
+ nfsi->ooo = NULL;
+ }
+ if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
+ /* Could it be a race with writeback? */
+ if (!(have_writers || have_delegation)) {
+ invalid |= NFS_INO_INVALID_DATA
+ | NFS_INO_INVALID_ACCESS
+ | NFS_INO_INVALID_ACL
+ | NFS_INO_INVALID_XATTR;
+ /* Force revalidate of all attributes */
+ save_cache_validity |= NFS_INO_INVALID_CTIME
+ | NFS_INO_INVALID_MTIME
+ | NFS_INO_INVALID_SIZE
+ | NFS_INO_INVALID_BLOCKS
+ | NFS_INO_INVALID_NLINK
+ | NFS_INO_INVALID_MODE
+ | NFS_INO_INVALID_OTHER;
+ if (S_ISDIR(inode->i_mode))
+ nfs_force_lookup_revalidate(inode);
+ attr_changed = true;
+ dprintk("NFS: change_attr change on server for file %s/%ld\n",
+ inode->i_sb->s_id,
+ inode->i_ino);
+ } else if (!have_delegation) {
+ nfs_ooo_record(nfsi, fattr);
+ nfs_ooo_merge(nfsi, inode_peek_iversion_raw(inode),
+ fattr->change_attr);
+ }
+ inode_set_iversion_raw(inode, fattr->change_attr);
+ }
+ } else {
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_CHANGE;
+ if (!have_delegation ||
+ (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
+ cache_revalidated = false;
+ }
+
+ if (fattr->valid & NFS_ATTR_FATTR_MTIME)
+ inode->i_mtime = fattr->mtime;
+ else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_MTIME;
+
+ if (fattr->valid & NFS_ATTR_FATTR_CTIME)
+ inode_set_ctime_to_ts(inode, fattr->ctime);
+ else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_CTIME;
+
+ /* Check if our cached file size is stale */
+ if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
+ new_isize = nfs_size_to_loff_t(fattr->size);
+ cur_isize = i_size_read(inode);
+ if (new_isize != cur_isize && !have_delegation) {
+ /* Do we perhaps have any outstanding writes, or has
+ * the file grown beyond our last write? */
+ if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
+ trace_nfs_size_update(inode, new_isize);
+ i_size_write(inode, new_isize);
+ if (!have_writers)
+ invalid |= NFS_INO_INVALID_DATA;
+ }
+ }
+ if (new_isize == 0 &&
+ !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
+ NFS_ATTR_FATTR_BLOCKS_USED))) {
+ fattr->du.nfs3.used = 0;
+ fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
+ }
+ } else
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_SIZE;
+
+ if (fattr->valid & NFS_ATTR_FATTR_ATIME)
+ inode->i_atime = fattr->atime;
+ else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_ATIME;
+
+ if (fattr->valid & NFS_ATTR_FATTR_MODE) {
+ if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
+ umode_t newmode = inode->i_mode & S_IFMT;
+ newmode |= fattr->mode & S_IALLUGO;
+ inode->i_mode = newmode;
+ invalid |= NFS_INO_INVALID_ACCESS
+ | NFS_INO_INVALID_ACL;
+ }
+ } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_MODE;
+
+ if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
+ if (!uid_eq(inode->i_uid, fattr->uid)) {
+ invalid |= NFS_INO_INVALID_ACCESS
+ | NFS_INO_INVALID_ACL;
+ inode->i_uid = fattr->uid;
+ }
+ } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_OTHER;
+
+ if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
+ if (!gid_eq(inode->i_gid, fattr->gid)) {
+ invalid |= NFS_INO_INVALID_ACCESS
+ | NFS_INO_INVALID_ACL;
+ inode->i_gid = fattr->gid;
+ }
+ } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_OTHER;
+
+ if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
+ if (inode->i_nlink != fattr->nlink)
+ set_nlink(inode, fattr->nlink);
+ } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_NLINK;
+
+ if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
+ /*
+ * report the blocks in 512byte units
+ */
+ inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
+ } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_BLOCKS;
+
+ if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
+ inode->i_blocks = fattr->du.nfs2.blocks;
+ else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
+ nfsi->cache_validity |=
+ save_cache_validity & NFS_INO_INVALID_BLOCKS;
+
+ /* Update attrtimeo value if we're out of the unstable period */
+ if (attr_changed) {
+ nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
+ nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
+ nfsi->attrtimeo_timestamp = now;
+ /* Set barrier to be more recent than all outstanding updates */
+ nfsi->attr_gencount = nfs_inc_attr_generation_counter();
+ } else {
+ if (cache_revalidated) {
+ if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
+ nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
+ nfsi->attrtimeo <<= 1;
+ if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
+ nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
+ }
+ nfsi->attrtimeo_timestamp = now;
+ }
+ /* Set the barrier to be more recent than this fattr */
+ if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
+ nfsi->attr_gencount = fattr->gencount;
+ }
+
+ /* Don't invalidate the data if we were to blame */
+ if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
+ || S_ISLNK(inode->i_mode)))
+ invalid &= ~NFS_INO_INVALID_DATA;
+ nfs_set_cache_invalid(inode, invalid);
+
+ return 0;
+ out_err:
+ /*
+ * No need to worry about unhashing the dentry, as the
+ * lookup validation will know that the inode is bad.
+ * (But we fall through to invalidate the caches.)
+ */
+ nfs_set_inode_stale_locked(inode);
+ return -ESTALE;
+}
+
+struct inode *nfs_alloc_inode(struct super_block *sb)
+{
+ struct nfs_inode *nfsi;
+ nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
+ if (!nfsi)
+ return NULL;
+ nfsi->flags = 0UL;
+ nfsi->cache_validity = 0UL;
+ nfsi->ooo = NULL;
+#if IS_ENABLED(CONFIG_NFS_V4)
+ nfsi->nfs4_acl = NULL;
+#endif /* CONFIG_NFS_V4 */
+#ifdef CONFIG_NFS_V4_2
+ nfsi->xattr_cache = NULL;
+#endif
+ nfs_netfs_inode_init(nfsi);
+
+ return &nfsi->vfs_inode;
+}
+EXPORT_SYMBOL_GPL(nfs_alloc_inode);
+
+void nfs_free_inode(struct inode *inode)
+{
+ kfree(NFS_I(inode)->ooo);
+ kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
+}
+EXPORT_SYMBOL_GPL(nfs_free_inode);
+
+static inline void nfs4_init_once(struct nfs_inode *nfsi)
+{
+#if IS_ENABLED(CONFIG_NFS_V4)
+ INIT_LIST_HEAD(&nfsi->open_states);
+ nfsi->delegation = NULL;
+ init_rwsem(&nfsi->rwsem);
+ nfsi->layout = NULL;
+#endif
+}
+
+static void init_once(void *foo)
+{
+ struct nfs_inode *nfsi = foo;
+
+ inode_init_once(&nfsi->vfs_inode);
+ INIT_LIST_HEAD(&nfsi->open_files);
+ INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
+ INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
+ nfs4_init_once(nfsi);
+}
+
+static int __init nfs_init_inodecache(void)
+{
+ nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
+ sizeof(struct nfs_inode),
+ 0, (SLAB_RECLAIM_ACCOUNT|
+ SLAB_MEM_SPREAD|SLAB_ACCOUNT),
+ init_once);
+ if (nfs_inode_cachep == NULL)
+ return -ENOMEM;
+
+ return 0;
+}
+
+static void nfs_destroy_inodecache(void)
+{
+ /*
+ * Make sure all delayed rcu free inodes are flushed before we
+ * destroy cache.
+ */
+ rcu_barrier();
+ kmem_cache_destroy(nfs_inode_cachep);
+}
+
+struct workqueue_struct *nfsiod_workqueue;
+EXPORT_SYMBOL_GPL(nfsiod_workqueue);
+
+/*
+ * start up the nfsiod workqueue
+ */
+static int nfsiod_start(void)
+{
+ struct workqueue_struct *wq;
+ dprintk("RPC: creating workqueue nfsiod\n");
+ wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
+ if (wq == NULL)
+ return -ENOMEM;
+ nfsiod_workqueue = wq;
+ return 0;
+}
+
+/*
+ * Destroy the nfsiod workqueue
+ */
+static void nfsiod_stop(void)
+{
+ struct workqueue_struct *wq;
+
+ wq = nfsiod_workqueue;
+ if (wq == NULL)
+ return;
+ nfsiod_workqueue = NULL;
+ destroy_workqueue(wq);
+}
+
+unsigned int nfs_net_id;
+EXPORT_SYMBOL_GPL(nfs_net_id);
+
+static int nfs_net_init(struct net *net)
+{
+ nfs_clients_init(net);
+ return nfs_fs_proc_net_init(net);
+}
+
+static void nfs_net_exit(struct net *net)
+{
+ nfs_fs_proc_net_exit(net);
+ nfs_clients_exit(net);
+}
+
+static struct pernet_operations nfs_net_ops = {
+ .init = nfs_net_init,
+ .exit = nfs_net_exit,
+ .id = &nfs_net_id,
+ .size = sizeof(struct nfs_net),
+};
+
+/*
+ * Initialize NFS
+ */
+static int __init init_nfs_fs(void)
+{
+ int err;
+
+ err = nfs_sysfs_init();
+ if (err < 0)
+ goto out10;
+
+ err = register_pernet_subsys(&nfs_net_ops);
+ if (err < 0)
+ goto out9;
+
+ err = nfsiod_start();
+ if (err)
+ goto out7;
+
+ err = nfs_fs_proc_init();
+ if (err)
+ goto out6;
+
+ err = nfs_init_nfspagecache();
+ if (err)
+ goto out5;
+
+ err = nfs_init_inodecache();
+ if (err)
+ goto out4;
+
+ err = nfs_init_readpagecache();
+ if (err)
+ goto out3;
+
+ err = nfs_init_writepagecache();
+ if (err)
+ goto out2;
+
+ err = nfs_init_directcache();
+ if (err)
+ goto out1;
+
+ rpc_proc_register(&init_net, &nfs_rpcstat);
+
+ err = register_nfs_fs();
+ if (err)
+ goto out0;
+
+ return 0;
+out0:
+ rpc_proc_unregister(&init_net, "nfs");
+ nfs_destroy_directcache();
+out1:
+ nfs_destroy_writepagecache();
+out2:
+ nfs_destroy_readpagecache();
+out3:
+ nfs_destroy_inodecache();
+out4:
+ nfs_destroy_nfspagecache();
+out5:
+ nfs_fs_proc_exit();
+out6:
+ nfsiod_stop();
+out7:
+ unregister_pernet_subsys(&nfs_net_ops);
+out9:
+ nfs_sysfs_exit();
+out10:
+ return err;
+}
+
+static void __exit exit_nfs_fs(void)
+{
+ nfs_destroy_directcache();
+ nfs_destroy_writepagecache();
+ nfs_destroy_readpagecache();
+ nfs_destroy_inodecache();
+ nfs_destroy_nfspagecache();
+ unregister_pernet_subsys(&nfs_net_ops);
+ rpc_proc_unregister(&init_net, "nfs");
+ unregister_nfs_fs();
+ nfs_fs_proc_exit();
+ nfsiod_stop();
+ nfs_sysfs_exit();
+}
+
+/* Not quite true; I just maintain it */
+MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
+MODULE_LICENSE("GPL");
+module_param(enable_ino64, bool, 0644);
+
+module_init(init_nfs_fs)
+module_exit(exit_nfs_fs)