4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <Alan.Cox@linux.org>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sched.h>
19 #include <linux/time.h>
20 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/smp_lock.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/nfs_idmap.h>
37 #include <linux/vfs.h>
38 #include <linux/inet.h>
39 #include <linux/nfs_xdr.h>
41 #include <asm/system.h>
42 #include <asm/uaccess.h>
46 #include "delegation.h"
50 #define NFSDBG_FACILITY NFSDBG_VFS
52 static void nfs_invalidate_inode(struct inode *);
53 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
55 static void nfs_zap_acl_cache(struct inode *);
57 static struct kmem_cache * nfs_inode_cachep;
59 static inline unsigned long
60 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
62 return nfs_fileid_to_ino_t(fattr->fileid);
65 int nfs_write_inode(struct inode *inode, int sync)
70 ret = filemap_fdatawait(inode->i_mapping);
72 ret = nfs_commit_inode(inode, FLUSH_SYNC);
74 ret = nfs_commit_inode(inode, 0);
77 __mark_inode_dirty(inode, I_DIRTY_DATASYNC);
81 void nfs_clear_inode(struct inode *inode)
84 * The following should never happen...
86 BUG_ON(nfs_have_writebacks(inode));
87 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
88 BUG_ON(atomic_read(&NFS_I(inode)->data_updates) != 0);
89 nfs_zap_acl_cache(inode);
90 nfs_access_zap_cache(inode);
94 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
96 int nfs_sync_mapping(struct address_space *mapping)
100 if (mapping->nrpages == 0)
102 unmap_mapping_range(mapping, 0, 0, 0);
103 ret = filemap_write_and_wait(mapping);
106 ret = nfs_wb_all(mapping->host);
112 * Invalidate the local caches
114 static void nfs_zap_caches_locked(struct inode *inode)
116 struct nfs_inode *nfsi = NFS_I(inode);
117 int mode = inode->i_mode;
119 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
121 NFS_ATTRTIMEO(inode) = NFS_MINATTRTIMEO(inode);
122 NFS_ATTRTIMEO_UPDATE(inode) = jiffies;
124 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
125 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
126 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
128 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
131 void nfs_zap_caches(struct inode *inode)
133 spin_lock(&inode->i_lock);
134 nfs_zap_caches_locked(inode);
135 spin_unlock(&inode->i_lock);
138 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
140 if (mapping->nrpages != 0) {
141 spin_lock(&inode->i_lock);
142 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
143 spin_unlock(&inode->i_lock);
147 static void nfs_zap_acl_cache(struct inode *inode)
149 void (*clear_acl_cache)(struct inode *);
151 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
152 if (clear_acl_cache != NULL)
153 clear_acl_cache(inode);
154 spin_lock(&inode->i_lock);
155 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
156 spin_unlock(&inode->i_lock);
159 void nfs_invalidate_atime(struct inode *inode)
161 spin_lock(&inode->i_lock);
162 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
163 spin_unlock(&inode->i_lock);
167 * Invalidate, but do not unhash, the inode.
168 * NB: must be called with inode->i_lock held!
170 static void nfs_invalidate_inode(struct inode *inode)
172 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
173 nfs_zap_caches_locked(inode);
176 struct nfs_find_desc {
178 struct nfs_fattr *fattr;
182 * In NFSv3 we can have 64bit inode numbers. In order to support
183 * this, and re-exported directories (also seen in NFSv2)
184 * we are forced to allow 2 different inodes to have the same
188 nfs_find_actor(struct inode *inode, void *opaque)
190 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
191 struct nfs_fh *fh = desc->fh;
192 struct nfs_fattr *fattr = desc->fattr;
194 if (NFS_FILEID(inode) != fattr->fileid)
196 if (nfs_compare_fh(NFS_FH(inode), fh))
198 if (is_bad_inode(inode) || NFS_STALE(inode))
204 nfs_init_locked(struct inode *inode, void *opaque)
206 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
207 struct nfs_fattr *fattr = desc->fattr;
209 NFS_FILEID(inode) = fattr->fileid;
210 nfs_copy_fh(NFS_FH(inode), desc->fh);
214 /* Don't use READDIRPLUS on directories that we believe are too large */
215 #define NFS_LIMIT_READDIRPLUS (8*PAGE_SIZE)
218 * This is our front-end to iget that looks up inodes by file handle
219 * instead of inode number.
222 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
224 struct nfs_find_desc desc = {
228 struct inode *inode = ERR_PTR(-ENOENT);
231 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
235 printk("NFS: Buggy server - nlink == 0!\n");
239 hash = nfs_fattr_to_ino_t(fattr);
241 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
243 inode = ERR_PTR(-ENOMEM);
247 if (inode->i_state & I_NEW) {
248 struct nfs_inode *nfsi = NFS_I(inode);
249 unsigned long now = jiffies;
251 /* We set i_ino for the few things that still rely on it,
255 /* We can't support update_atime(), since the server will reset it */
256 inode->i_flags |= S_NOATIME|S_NOCMTIME;
257 inode->i_mode = fattr->mode;
258 /* Why so? Because we want revalidate for devices/FIFOs, and
259 * that's precisely what we have in nfs_file_inode_operations.
261 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
262 if (S_ISREG(inode->i_mode)) {
263 inode->i_fop = &nfs_file_operations;
264 inode->i_data.a_ops = &nfs_file_aops;
265 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
266 } else if (S_ISDIR(inode->i_mode)) {
267 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
268 inode->i_fop = &nfs_dir_operations;
269 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS)
270 && fattr->size <= NFS_LIMIT_READDIRPLUS)
271 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode));
272 /* Deal with crossing mountpoints */
273 if (!nfs_fsid_equal(&NFS_SB(sb)->fsid, &fattr->fsid)) {
274 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
275 inode->i_op = &nfs_referral_inode_operations;
277 inode->i_op = &nfs_mountpoint_inode_operations;
280 } else if (S_ISLNK(inode->i_mode))
281 inode->i_op = &nfs_symlink_inode_operations;
283 init_special_inode(inode, inode->i_mode, fattr->rdev);
285 nfsi->read_cache_jiffies = fattr->time_start;
286 nfsi->last_updated = now;
287 nfsi->cache_change_attribute = now;
288 inode->i_atime = fattr->atime;
289 inode->i_mtime = fattr->mtime;
290 inode->i_ctime = fattr->ctime;
291 if (fattr->valid & NFS_ATTR_FATTR_V4)
292 nfsi->change_attr = fattr->change_attr;
293 inode->i_size = nfs_size_to_loff_t(fattr->size);
294 inode->i_nlink = fattr->nlink;
295 inode->i_uid = fattr->uid;
296 inode->i_gid = fattr->gid;
297 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
299 * report the blocks in 512byte units
301 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
303 inode->i_blocks = fattr->du.nfs2.blocks;
305 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
306 nfsi->attrtimeo_timestamp = now;
307 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
308 nfsi->access_cache = RB_ROOT;
310 unlock_new_inode(inode);
312 nfs_refresh_inode(inode, fattr);
313 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
315 (long long)NFS_FILEID(inode),
316 atomic_read(&inode->i_count));
322 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
326 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET)
329 nfs_setattr(struct dentry *dentry, struct iattr *attr)
331 struct inode *inode = dentry->d_inode;
332 struct nfs_fattr fattr;
335 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
337 if (attr->ia_valid & ATTR_SIZE) {
338 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
339 attr->ia_valid &= ~ATTR_SIZE;
342 /* Optimization: if the end result is no change, don't RPC */
343 attr->ia_valid &= NFS_VALID_ATTRS;
344 if (attr->ia_valid == 0)
348 nfs_begin_data_update(inode);
349 /* Write all dirty data */
350 if (S_ISREG(inode->i_mode)) {
351 filemap_write_and_wait(inode->i_mapping);
355 * Return any delegations if we're going to change ACLs
357 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
358 nfs_inode_return_delegation(inode);
359 error = NFS_PROTO(inode)->setattr(dentry, &fattr, attr);
361 nfs_refresh_inode(inode, &fattr);
362 nfs_end_data_update(inode);
368 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
369 * @inode: pointer to struct inode
370 * @attr: pointer to struct iattr
372 * Note: we do this in the *proc.c in order to ensure that
373 * it works for things like exclusive creates too.
375 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
377 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
378 if ((attr->ia_valid & ATTR_MODE) != 0) {
379 int mode = attr->ia_mode & S_IALLUGO;
380 mode |= inode->i_mode & ~S_IALLUGO;
381 inode->i_mode = mode;
383 if ((attr->ia_valid & ATTR_UID) != 0)
384 inode->i_uid = attr->ia_uid;
385 if ((attr->ia_valid & ATTR_GID) != 0)
386 inode->i_gid = attr->ia_gid;
387 spin_lock(&inode->i_lock);
388 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
389 spin_unlock(&inode->i_lock);
391 if ((attr->ia_valid & ATTR_SIZE) != 0) {
392 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
393 inode->i_size = attr->ia_size;
394 vmtruncate(inode, attr->ia_size);
398 static int nfs_wait_schedule(void *word)
400 if (signal_pending(current))
407 * Wait for the inode to get unlocked.
409 static int nfs_wait_on_inode(struct inode *inode)
411 struct rpc_clnt *clnt = NFS_CLIENT(inode);
412 struct nfs_inode *nfsi = NFS_I(inode);
416 rpc_clnt_sigmask(clnt, &oldmask);
417 error = wait_on_bit_lock(&nfsi->flags, NFS_INO_REVALIDATING,
418 nfs_wait_schedule, TASK_INTERRUPTIBLE);
419 rpc_clnt_sigunmask(clnt, &oldmask);
424 static void nfs_wake_up_inode(struct inode *inode)
426 struct nfs_inode *nfsi = NFS_I(inode);
428 clear_bit(NFS_INO_REVALIDATING, &nfsi->flags);
429 smp_mb__after_clear_bit();
430 wake_up_bit(&nfsi->flags, NFS_INO_REVALIDATING);
433 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
435 struct inode *inode = dentry->d_inode;
436 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
439 /* Flush out writes to the server in order to update c/mtime */
440 if (S_ISREG(inode->i_mode))
441 nfs_wb_nocommit(inode);
444 * We may force a getattr if the user cares about atime.
446 * Note that we only have to check the vfsmount flags here:
447 * - NFS always sets S_NOATIME by so checking it would give a
449 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
450 * no point in checking those.
452 if ((mnt->mnt_flags & MNT_NOATIME) ||
453 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
457 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
459 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
461 generic_fillattr(inode, stat);
462 stat->ino = NFS_FILEID(inode);
467 static struct nfs_open_context *alloc_nfs_open_context(struct vfsmount *mnt, struct dentry *dentry, struct rpc_cred *cred)
469 struct nfs_open_context *ctx;
471 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
473 ctx->path.dentry = dget(dentry);
474 ctx->path.mnt = mntget(mnt);
475 ctx->cred = get_rpccred(cred);
477 ctx->lockowner = current->files;
480 atomic_set(&ctx->count, 1);
485 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
488 atomic_inc(&ctx->count);
492 void put_nfs_open_context(struct nfs_open_context *ctx)
494 struct inode *inode = ctx->path.dentry->d_inode;
496 if (!atomic_dec_and_lock(&ctx->count, &inode->i_lock))
498 list_del(&ctx->list);
499 spin_unlock(&inode->i_lock);
500 if (ctx->state != NULL)
501 nfs4_close_state(&ctx->path, ctx->state, ctx->mode);
502 if (ctx->cred != NULL)
503 put_rpccred(ctx->cred);
504 dput(ctx->path.dentry);
505 mntput(ctx->path.mnt);
510 * Ensure that mmap has a recent RPC credential for use when writing out
513 static void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
515 struct inode *inode = filp->f_path.dentry->d_inode;
516 struct nfs_inode *nfsi = NFS_I(inode);
518 filp->private_data = get_nfs_open_context(ctx);
519 spin_lock(&inode->i_lock);
520 list_add(&ctx->list, &nfsi->open_files);
521 spin_unlock(&inode->i_lock);
525 * Given an inode, search for an open context with the desired characteristics
527 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, int mode)
529 struct nfs_inode *nfsi = NFS_I(inode);
530 struct nfs_open_context *pos, *ctx = NULL;
532 spin_lock(&inode->i_lock);
533 list_for_each_entry(pos, &nfsi->open_files, list) {
534 if (cred != NULL && pos->cred != cred)
536 if ((pos->mode & mode) == mode) {
537 ctx = get_nfs_open_context(pos);
541 spin_unlock(&inode->i_lock);
545 static void nfs_file_clear_open_context(struct file *filp)
547 struct inode *inode = filp->f_path.dentry->d_inode;
548 struct nfs_open_context *ctx = nfs_file_open_context(filp);
551 filp->private_data = NULL;
552 spin_lock(&inode->i_lock);
553 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
554 spin_unlock(&inode->i_lock);
555 put_nfs_open_context(ctx);
560 * These allocate and release file read/write context information.
562 int nfs_open(struct inode *inode, struct file *filp)
564 struct nfs_open_context *ctx;
565 struct rpc_cred *cred;
567 cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0);
569 return PTR_ERR(cred);
570 ctx = alloc_nfs_open_context(filp->f_path.mnt, filp->f_path.dentry, cred);
574 ctx->mode = filp->f_mode;
575 nfs_file_set_open_context(filp, ctx);
576 put_nfs_open_context(ctx);
580 int nfs_release(struct inode *inode, struct file *filp)
582 nfs_file_clear_open_context(filp);
587 * This function is called whenever some part of NFS notices that
588 * the cached attributes have to be refreshed.
591 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
593 int status = -ESTALE;
594 struct nfs_fattr fattr;
595 struct nfs_inode *nfsi = NFS_I(inode);
597 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
598 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
600 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
602 if (is_bad_inode(inode))
604 if (NFS_STALE(inode))
607 status = nfs_wait_on_inode(inode);
612 if (NFS_STALE(inode))
615 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), &fattr);
617 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
619 (long long)NFS_FILEID(inode), status);
620 if (status == -ESTALE) {
621 nfs_zap_caches(inode);
622 if (!S_ISDIR(inode->i_mode))
623 set_bit(NFS_INO_STALE, &NFS_FLAGS(inode));
628 spin_lock(&inode->i_lock);
629 status = nfs_update_inode(inode, &fattr);
631 spin_unlock(&inode->i_lock);
632 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
634 (long long)NFS_FILEID(inode), status);
637 spin_unlock(&inode->i_lock);
639 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
640 nfs_zap_acl_cache(inode);
642 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
644 (long long)NFS_FILEID(inode));
647 nfs_wake_up_inode(inode);
654 int nfs_attribute_timeout(struct inode *inode)
656 struct nfs_inode *nfsi = NFS_I(inode);
658 if (nfs_have_delegation(inode, FMODE_READ))
660 return !time_in_range(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
664 * nfs_revalidate_inode - Revalidate the inode attributes
665 * @server - pointer to nfs_server struct
666 * @inode - pointer to inode struct
668 * Updates inode attribute information by retrieving the data from the server.
670 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
672 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
673 && !nfs_attribute_timeout(inode))
674 return NFS_STALE(inode) ? -ESTALE : 0;
675 return __nfs_revalidate_inode(server, inode);
678 static int nfs_invalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
680 struct nfs_inode *nfsi = NFS_I(inode);
682 if (mapping->nrpages != 0) {
683 int ret = invalidate_inode_pages2(mapping);
687 spin_lock(&inode->i_lock);
688 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
689 if (S_ISDIR(inode->i_mode)) {
690 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
691 /* This ensures we revalidate child dentries */
692 nfsi->cache_change_attribute = jiffies;
694 spin_unlock(&inode->i_lock);
695 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
696 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
697 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
701 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
705 mutex_lock(&inode->i_mutex);
706 if (NFS_I(inode)->cache_validity & NFS_INO_INVALID_DATA) {
707 ret = nfs_sync_mapping(mapping);
709 ret = nfs_invalidate_mapping_nolock(inode, mapping);
711 mutex_unlock(&inode->i_mutex);
716 * nfs_revalidate_mapping_nolock - Revalidate the pagecache
717 * @inode - pointer to host inode
718 * @mapping - pointer to mapping
720 int nfs_revalidate_mapping_nolock(struct inode *inode, struct address_space *mapping)
722 struct nfs_inode *nfsi = NFS_I(inode);
725 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
726 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
727 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
731 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
732 ret = nfs_invalidate_mapping_nolock(inode, mapping);
738 * nfs_revalidate_mapping - Revalidate the pagecache
739 * @inode - pointer to host inode
740 * @mapping - pointer to mapping
742 * This version of the function will take the inode->i_mutex and attempt to
743 * flush out all dirty data if it needs to invalidate the page cache.
745 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
747 struct nfs_inode *nfsi = NFS_I(inode);
750 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
751 || nfs_attribute_timeout(inode) || NFS_STALE(inode)) {
752 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
756 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
757 ret = nfs_invalidate_mapping(inode, mapping);
763 * nfs_begin_data_update
764 * @inode - pointer to inode
765 * Declare that a set of operations will update file data on the server
767 void nfs_begin_data_update(struct inode *inode)
769 atomic_inc(&NFS_I(inode)->data_updates);
773 * nfs_end_data_update
774 * @inode - pointer to inode
775 * Declare end of the operations that will update file data
776 * This will mark the inode as immediately needing revalidation
777 * of its attribute cache.
779 void nfs_end_data_update(struct inode *inode)
781 struct nfs_inode *nfsi = NFS_I(inode);
783 /* Directories: invalidate page cache */
784 if (S_ISDIR(inode->i_mode)) {
785 spin_lock(&inode->i_lock);
786 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
787 spin_unlock(&inode->i_lock);
789 atomic_dec(&nfsi->data_updates);
792 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
794 struct nfs_inode *nfsi = NFS_I(inode);
796 /* If we have atomic WCC data, we may update some attributes */
797 if ((fattr->valid & NFS_ATTR_WCC) != 0) {
798 if (timespec_equal(&inode->i_ctime, &fattr->pre_ctime))
799 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
800 if (timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
801 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
802 if (S_ISDIR(inode->i_mode))
803 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
805 if (inode->i_size == fattr->pre_size && nfsi->npages == 0)
806 inode->i_size = fattr->size;
811 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
812 * @inode - pointer to inode
813 * @fattr - updated attributes
815 * Verifies the attribute cache. If we have just changed the attributes,
816 * so that fattr carries weak cache consistency data, then it may
817 * also update the ctime/mtime/change_attribute.
819 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
821 struct nfs_inode *nfsi = NFS_I(inode);
822 loff_t cur_size, new_isize;
826 /* Has the inode gone and changed behind our back? */
827 if (nfsi->fileid != fattr->fileid
828 || (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
832 /* Are we in the process of updating data on the server? */
833 data_unstable = nfs_caches_unstable(inode);
835 /* Do atomic weak cache consistency updates */
836 nfs_wcc_update_inode(inode, fattr);
838 if ((fattr->valid & NFS_ATTR_FATTR_V4) != 0 &&
839 nfsi->change_attr != fattr->change_attr)
840 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
842 /* Verify a few of the more important attributes */
843 if (!timespec_equal(&inode->i_mtime, &fattr->mtime))
844 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
846 cur_size = i_size_read(inode);
847 new_isize = nfs_size_to_loff_t(fattr->size);
848 if (cur_size != new_isize && nfsi->npages == 0)
849 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
851 /* Have any file permissions changed? */
852 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)
853 || inode->i_uid != fattr->uid
854 || inode->i_gid != fattr->gid)
855 nfsi->cache_validity |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
857 /* Has the link count changed? */
858 if (inode->i_nlink != fattr->nlink)
859 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
861 if (!timespec_equal(&inode->i_atime, &fattr->atime))
862 nfsi->cache_validity |= NFS_INO_INVALID_ATIME;
864 nfsi->read_cache_jiffies = fattr->time_start;
869 * nfs_refresh_inode - try to update the inode attribute cache
870 * @inode - pointer to inode
871 * @fattr - updated attributes
873 * Check that an RPC call that returned attributes has not overlapped with
874 * other recent updates of the inode metadata, then decide whether it is
875 * safe to do a full update of the inode attributes, or whether just to
876 * call nfs_check_inode_attributes.
878 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
880 struct nfs_inode *nfsi = NFS_I(inode);
883 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
885 spin_lock(&inode->i_lock);
886 if (time_after(fattr->time_start, nfsi->last_updated))
887 status = nfs_update_inode(inode, fattr);
889 status = nfs_check_inode_attributes(inode, fattr);
891 spin_unlock(&inode->i_lock);
896 * nfs_post_op_update_inode - try to update the inode attribute cache
897 * @inode - pointer to inode
898 * @fattr - updated attributes
900 * After an operation that has changed the inode metadata, mark the
901 * attribute cache as being invalid, then try to update it.
903 * NB: if the server didn't return any post op attributes, this
904 * function will force the retrieval of attributes before the next
905 * NFS request. Thus it should be used only for operations that
906 * are expected to change one or more attributes, to avoid
907 * unnecessary NFS requests and trips through nfs_update_inode().
909 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
911 struct nfs_inode *nfsi = NFS_I(inode);
914 if (unlikely((fattr->valid & NFS_ATTR_FATTR) == 0)) {
915 spin_lock(&inode->i_lock);
916 nfsi->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
917 nfsi->cache_change_attribute = jiffies;
918 spin_unlock(&inode->i_lock);
921 status = nfs_refresh_inode(inode, fattr);
927 * Many nfs protocol calls return the new file attributes after
928 * an operation. Here we update the inode to reflect the state
929 * of the server's inode.
931 * This is a bit tricky because we have to make sure all dirty pages
932 * have been sent off to the server before calling invalidate_inode_pages.
933 * To make sure no other process adds more write requests while we try
934 * our best to flush them, we make them sleep during the attribute refresh.
936 * A very similar scenario holds for the dir cache.
938 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
940 struct nfs_server *server;
941 struct nfs_inode *nfsi = NFS_I(inode);
942 loff_t cur_isize, new_isize;
943 unsigned int invalid = 0;
944 unsigned long now = jiffies;
947 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
948 __FUNCTION__, inode->i_sb->s_id, inode->i_ino,
949 atomic_read(&inode->i_count), fattr->valid);
951 if (nfsi->fileid != fattr->fileid)
955 * Make sure the inode's type hasn't changed.
957 if ((inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
960 server = NFS_SERVER(inode);
961 /* Update the fsid? */
962 if (S_ISDIR(inode->i_mode)
963 && !nfs_fsid_equal(&server->fsid, &fattr->fsid))
964 server->fsid = fattr->fsid;
967 * Update the read time so we don't revalidate too often.
969 nfsi->read_cache_jiffies = fattr->time_start;
970 nfsi->last_updated = now;
972 /* Are we racing with known updates of the metadata on the server? */
973 data_stable = nfs_verify_change_attribute(inode, fattr->time_start);
974 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ATIME
975 | NFS_INO_REVAL_PAGECACHE);
977 /* Do atomic weak cache consistency updates */
978 nfs_wcc_update_inode(inode, fattr);
980 /* More cache consistency checks */
981 if (!(fattr->valid & NFS_ATTR_FATTR_V4)) {
982 /* NFSv2/v3: Check if the mtime agrees */
983 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
984 dprintk("NFS: mtime change on server for file %s/%ld\n",
985 inode->i_sb->s_id, inode->i_ino);
986 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
987 nfsi->cache_change_attribute = now;
989 /* If ctime has changed we should definitely clear access+acl caches */
990 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
991 invalid |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
992 nfsi->cache_change_attribute = now;
994 } else if (nfsi->change_attr != fattr->change_attr) {
995 dprintk("NFS: change_attr change on server for file %s/%ld\n",
996 inode->i_sb->s_id, inode->i_ino);
997 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
998 nfsi->cache_change_attribute = now;
1001 /* Check if our cached file size is stale */
1002 new_isize = nfs_size_to_loff_t(fattr->size);
1003 cur_isize = i_size_read(inode);
1004 if (new_isize != cur_isize) {
1005 /* Do we perhaps have any outstanding writes? */
1006 if (nfsi->npages == 0) {
1007 /* No, but did we race with nfs_end_data_update()? */
1009 inode->i_size = new_isize;
1010 invalid |= NFS_INO_INVALID_DATA;
1012 invalid |= NFS_INO_INVALID_ATTR;
1013 } else if (new_isize > cur_isize) {
1014 inode->i_size = new_isize;
1015 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1017 nfsi->cache_change_attribute = now;
1018 dprintk("NFS: isize change on server for file %s/%ld\n",
1019 inode->i_sb->s_id, inode->i_ino);
1023 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1024 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1025 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1026 nfsi->change_attr = fattr->change_attr;
1028 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO) ||
1029 inode->i_uid != fattr->uid ||
1030 inode->i_gid != fattr->gid)
1031 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1033 inode->i_mode = fattr->mode;
1034 inode->i_nlink = fattr->nlink;
1035 inode->i_uid = fattr->uid;
1036 inode->i_gid = fattr->gid;
1038 if (fattr->valid & (NFS_ATTR_FATTR_V3 | NFS_ATTR_FATTR_V4)) {
1040 * report the blocks in 512byte units
1042 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1044 inode->i_blocks = fattr->du.nfs2.blocks;
1047 /* Update attrtimeo value if we're out of the unstable period */
1048 if (invalid & NFS_INO_INVALID_ATTR) {
1049 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1050 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1051 nfsi->attrtimeo_timestamp = now;
1052 } else if (!time_in_range(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1053 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1054 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1055 nfsi->attrtimeo_timestamp = now;
1057 invalid &= ~NFS_INO_INVALID_ATTR;
1058 /* Don't invalidate the data if we were to blame */
1059 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1060 || S_ISLNK(inode->i_mode)))
1061 invalid &= ~NFS_INO_INVALID_DATA;
1062 if (!nfs_have_delegation(inode, FMODE_READ) ||
1063 (nfsi->cache_validity & NFS_INO_REVAL_FORCED))
1064 nfsi->cache_validity |= invalid;
1065 nfsi->cache_validity &= ~NFS_INO_REVAL_FORCED;
1070 * Big trouble! The inode has become a different object.
1072 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1073 __FUNCTION__, inode->i_ino, inode->i_mode, fattr->mode);
1076 * No need to worry about unhashing the dentry, as the
1077 * lookup validation will know that the inode is bad.
1078 * (But we fall through to invalidate the caches.)
1080 nfs_invalidate_inode(inode);
1084 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1085 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1086 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
1087 (long long)nfsi->fileid, (long long)fattr->fileid);
1092 #ifdef CONFIG_NFS_V4
1095 * Clean out any remaining NFSv4 state that might be left over due
1096 * to open() calls that passed nfs_atomic_lookup, but failed to call
1099 void nfs4_clear_inode(struct inode *inode)
1101 /* If we are holding a delegation, return it! */
1102 nfs_inode_return_delegation(inode);
1103 /* First call standard NFS clear_inode() code */
1104 nfs_clear_inode(inode);
1108 struct inode *nfs_alloc_inode(struct super_block *sb)
1110 struct nfs_inode *nfsi;
1111 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1115 nfsi->cache_validity = 0UL;
1116 #ifdef CONFIG_NFS_V3_ACL
1117 nfsi->acl_access = ERR_PTR(-EAGAIN);
1118 nfsi->acl_default = ERR_PTR(-EAGAIN);
1120 #ifdef CONFIG_NFS_V4
1121 nfsi->nfs4_acl = NULL;
1122 #endif /* CONFIG_NFS_V4 */
1123 return &nfsi->vfs_inode;
1126 void nfs_destroy_inode(struct inode *inode)
1128 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1131 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1133 #ifdef CONFIG_NFS_V4
1134 INIT_LIST_HEAD(&nfsi->open_states);
1135 nfsi->delegation = NULL;
1136 nfsi->delegation_state = 0;
1137 init_rwsem(&nfsi->rwsem);
1141 static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
1143 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1145 inode_init_once(&nfsi->vfs_inode);
1146 INIT_LIST_HEAD(&nfsi->open_files);
1147 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1148 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1149 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1150 atomic_set(&nfsi->data_updates, 0);
1153 nfs4_init_once(nfsi);
1156 static int __init nfs_init_inodecache(void)
1158 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1159 sizeof(struct nfs_inode),
1160 0, (SLAB_RECLAIM_ACCOUNT|
1163 if (nfs_inode_cachep == NULL)
1169 static void nfs_destroy_inodecache(void)
1171 kmem_cache_destroy(nfs_inode_cachep);
1177 static int __init init_nfs_fs(void)
1181 err = nfs_fs_proc_init();
1185 err = nfs_init_nfspagecache();
1189 err = nfs_init_inodecache();
1193 err = nfs_init_readpagecache();
1197 err = nfs_init_writepagecache();
1201 err = nfs_init_directcache();
1205 #ifdef CONFIG_PROC_FS
1206 rpc_proc_register(&nfs_rpcstat);
1208 if ((err = register_nfs_fs()) != 0)
1212 #ifdef CONFIG_PROC_FS
1213 rpc_proc_unregister("nfs");
1215 nfs_destroy_directcache();
1217 nfs_destroy_writepagecache();
1219 nfs_destroy_readpagecache();
1221 nfs_destroy_inodecache();
1223 nfs_destroy_nfspagecache();
1230 static void __exit exit_nfs_fs(void)
1232 nfs_destroy_directcache();
1233 nfs_destroy_writepagecache();
1234 nfs_destroy_readpagecache();
1235 nfs_destroy_inodecache();
1236 nfs_destroy_nfspagecache();
1237 #ifdef CONFIG_PROC_FS
1238 rpc_proc_unregister("nfs");
1240 unregister_nfs_fs();
1244 /* Not quite true; I just maintain it */
1245 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1246 MODULE_LICENSE("GPL");
1248 module_init(init_nfs_fs)
1249 module_exit(exit_nfs_fs)