4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, 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/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/nfs_idmap.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
42 #include <linux/crc32.h>
44 #include <asm/uaccess.h>
48 #include "delegation.h"
52 #include "dns_resolve.h"
56 #define NFSDBG_FACILITY NFSDBG_VFS
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66 static struct kmem_cache * nfs_inode_cachep;
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 return nfs_fileid_to_ino_t(fattr->fileid);
75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
76 * @word: long word containing the bit lock
78 int nfs_wait_bit_killable(void *word)
80 if (fatal_signal_pending(current))
87 * nfs_compat_user_ino64 - returns the user-visible inode number
88 * @fileid: 64-bit fileid
90 * This function returns a 32-bit inode number if the boot parameter
91 * nfs.enable_ino64 is zero.
93 u64 nfs_compat_user_ino64(u64 fileid)
104 if (sizeof(ino) < sizeof(fileid))
105 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
109 static void nfs_clear_inode(struct inode *inode)
112 * The following should never happen...
114 BUG_ON(nfs_have_writebacks(inode));
115 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
116 nfs_zap_acl_cache(inode);
117 nfs_access_zap_cache(inode);
118 nfs_fscache_release_inode_cookie(inode);
121 void nfs_evict_inode(struct inode *inode)
123 truncate_inode_pages(&inode->i_data, 0);
124 end_writeback(inode);
125 nfs_clear_inode(inode);
129 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
131 int nfs_sync_mapping(struct address_space *mapping)
135 if (mapping->nrpages != 0) {
136 unmap_mapping_range(mapping, 0, 0, 0);
137 ret = nfs_wb_all(mapping->host);
143 * Invalidate the local caches
145 static void nfs_zap_caches_locked(struct inode *inode)
147 struct nfs_inode *nfsi = NFS_I(inode);
148 int mode = inode->i_mode;
150 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
152 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
153 nfsi->attrtimeo_timestamp = jiffies;
155 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
156 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
157 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
159 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
162 void nfs_zap_caches(struct inode *inode)
164 spin_lock(&inode->i_lock);
165 nfs_zap_caches_locked(inode);
166 spin_unlock(&inode->i_lock);
169 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
171 if (mapping->nrpages != 0) {
172 spin_lock(&inode->i_lock);
173 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
174 spin_unlock(&inode->i_lock);
178 void nfs_zap_acl_cache(struct inode *inode)
180 void (*clear_acl_cache)(struct inode *);
182 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
183 if (clear_acl_cache != NULL)
184 clear_acl_cache(inode);
185 spin_lock(&inode->i_lock);
186 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
187 spin_unlock(&inode->i_lock);
190 void nfs_invalidate_atime(struct inode *inode)
192 spin_lock(&inode->i_lock);
193 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
194 spin_unlock(&inode->i_lock);
198 * Invalidate, but do not unhash, the inode.
199 * NB: must be called with inode->i_lock held!
201 static void nfs_invalidate_inode(struct inode *inode)
203 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
204 nfs_zap_caches_locked(inode);
207 struct nfs_find_desc {
209 struct nfs_fattr *fattr;
213 * In NFSv3 we can have 64bit inode numbers. In order to support
214 * this, and re-exported directories (also seen in NFSv2)
215 * we are forced to allow 2 different inodes to have the same
219 nfs_find_actor(struct inode *inode, void *opaque)
221 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
222 struct nfs_fh *fh = desc->fh;
223 struct nfs_fattr *fattr = desc->fattr;
225 if (NFS_FILEID(inode) != fattr->fileid)
227 if (nfs_compare_fh(NFS_FH(inode), fh))
229 if (is_bad_inode(inode) || NFS_STALE(inode))
235 nfs_init_locked(struct inode *inode, void *opaque)
237 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
238 struct nfs_fattr *fattr = desc->fattr;
240 set_nfs_fileid(inode, fattr->fileid);
241 nfs_copy_fh(NFS_FH(inode), desc->fh);
246 * This is our front-end to iget that looks up inodes by file handle
247 * instead of inode number.
250 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
252 struct nfs_find_desc desc = {
256 struct inode *inode = ERR_PTR(-ENOENT);
259 nfs_attr_check_mountpoint(sb, fattr);
261 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
262 !nfs_attr_use_mounted_on_fileid(fattr))
264 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
267 hash = nfs_fattr_to_ino_t(fattr);
269 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
271 inode = ERR_PTR(-ENOMEM);
275 if (inode->i_state & I_NEW) {
276 struct nfs_inode *nfsi = NFS_I(inode);
277 unsigned long now = jiffies;
279 /* We set i_ino for the few things that still rely on it,
283 /* We can't support update_atime(), since the server will reset it */
284 inode->i_flags |= S_NOATIME|S_NOCMTIME;
285 inode->i_mode = fattr->mode;
286 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
287 && nfs_server_capable(inode, NFS_CAP_MODE))
288 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
289 | NFS_INO_INVALID_ACCESS
290 | NFS_INO_INVALID_ACL;
291 /* Why so? Because we want revalidate for devices/FIFOs, and
292 * that's precisely what we have in nfs_file_inode_operations.
294 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
295 if (S_ISREG(inode->i_mode)) {
296 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
297 inode->i_data.a_ops = &nfs_file_aops;
298 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
299 } else if (S_ISDIR(inode->i_mode)) {
300 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
301 inode->i_fop = &nfs_dir_operations;
302 inode->i_data.a_ops = &nfs_dir_aops;
303 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS))
304 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
305 /* Deal with crossing mountpoints */
306 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
307 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
308 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
309 inode->i_op = &nfs_referral_inode_operations;
311 inode->i_op = &nfs_mountpoint_inode_operations;
313 inode->i_flags |= S_AUTOMOUNT;
315 } else if (S_ISLNK(inode->i_mode))
316 inode->i_op = &nfs_symlink_inode_operations;
318 init_special_inode(inode, inode->i_mode, fattr->rdev);
320 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
321 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
322 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
323 inode->i_version = 0;
329 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
331 nfsi->read_cache_jiffies = fattr->time_start;
332 nfsi->attr_gencount = fattr->gencount;
333 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
334 inode->i_atime = fattr->atime;
335 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
336 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
337 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
338 inode->i_mtime = fattr->mtime;
339 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
340 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
341 | NFS_INO_INVALID_DATA;
342 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
343 inode->i_ctime = fattr->ctime;
344 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
345 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
346 | NFS_INO_INVALID_ACCESS
347 | NFS_INO_INVALID_ACL;
348 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
349 inode->i_version = fattr->change_attr;
350 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
351 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
352 | NFS_INO_INVALID_DATA;
353 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
354 inode->i_size = nfs_size_to_loff_t(fattr->size);
356 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
357 | NFS_INO_INVALID_DATA
358 | NFS_INO_REVAL_PAGECACHE;
359 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
360 set_nlink(inode, fattr->nlink);
361 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
362 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
363 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
364 inode->i_uid = fattr->uid;
365 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
366 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
367 | NFS_INO_INVALID_ACCESS
368 | NFS_INO_INVALID_ACL;
369 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
370 inode->i_gid = fattr->gid;
371 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
372 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
373 | NFS_INO_INVALID_ACCESS
374 | NFS_INO_INVALID_ACL;
375 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
376 inode->i_blocks = fattr->du.nfs2.blocks;
377 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
379 * report the blocks in 512byte units
381 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
383 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
384 nfsi->attrtimeo_timestamp = now;
385 nfsi->access_cache = RB_ROOT;
387 nfs_fscache_init_inode_cookie(inode);
389 unlock_new_inode(inode);
391 nfs_refresh_inode(inode, fattr);
392 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
394 (long long)NFS_FILEID(inode),
395 nfs_display_fhandle_hash(fh),
396 atomic_read(&inode->i_count));
402 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
406 #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)
409 nfs_setattr(struct dentry *dentry, struct iattr *attr)
411 struct inode *inode = dentry->d_inode;
412 struct nfs_fattr *fattr;
415 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
417 /* skip mode change if it's just for clearing setuid/setgid */
418 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
419 attr->ia_valid &= ~ATTR_MODE;
421 if (attr->ia_valid & ATTR_SIZE) {
422 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
423 attr->ia_valid &= ~ATTR_SIZE;
426 /* Optimization: if the end result is no change, don't RPC */
427 attr->ia_valid &= NFS_VALID_ATTRS;
428 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
431 /* Write all dirty data */
432 if (S_ISREG(inode->i_mode))
435 fattr = nfs_alloc_fattr();
439 * Return any delegations if we're going to change ACLs
441 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
442 nfs_inode_return_delegation(inode);
443 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
445 nfs_refresh_inode(inode, fattr);
446 nfs_free_fattr(fattr);
452 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
453 * @inode: inode of the file used
454 * @offset: file offset to start truncating
456 * This is a copy of the common vmtruncate, but with the locking
457 * corrected to take into account the fact that NFS requires
458 * inode->i_size to be updated under the inode->i_lock.
460 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
465 err = inode_newsize_ok(inode, offset);
469 spin_lock(&inode->i_lock);
470 oldsize = inode->i_size;
471 i_size_write(inode, offset);
472 spin_unlock(&inode->i_lock);
474 truncate_pagecache(inode, oldsize, offset);
480 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
481 * @inode: pointer to struct inode
482 * @attr: pointer to struct iattr
484 * Note: we do this in the *proc.c in order to ensure that
485 * it works for things like exclusive creates too.
487 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
489 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
490 spin_lock(&inode->i_lock);
491 if ((attr->ia_valid & ATTR_MODE) != 0) {
492 int mode = attr->ia_mode & S_IALLUGO;
493 mode |= inode->i_mode & ~S_IALLUGO;
494 inode->i_mode = mode;
496 if ((attr->ia_valid & ATTR_UID) != 0)
497 inode->i_uid = attr->ia_uid;
498 if ((attr->ia_valid & ATTR_GID) != 0)
499 inode->i_gid = attr->ia_gid;
500 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
501 spin_unlock(&inode->i_lock);
503 if ((attr->ia_valid & ATTR_SIZE) != 0) {
504 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
505 nfs_vmtruncate(inode, attr->ia_size);
509 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
511 struct inode *inode = dentry->d_inode;
512 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
515 /* Flush out writes to the server in order to update c/mtime. */
516 if (S_ISREG(inode->i_mode)) {
517 err = filemap_write_and_wait(inode->i_mapping);
523 * We may force a getattr if the user cares about atime.
525 * Note that we only have to check the vfsmount flags here:
526 * - NFS always sets S_NOATIME by so checking it would give a
528 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
529 * no point in checking those.
531 if ((mnt->mnt_flags & MNT_NOATIME) ||
532 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
536 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
538 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
540 generic_fillattr(inode, stat);
541 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
547 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
549 atomic_set(&l_ctx->count, 1);
550 l_ctx->lockowner = current->files;
551 l_ctx->pid = current->tgid;
552 INIT_LIST_HEAD(&l_ctx->list);
555 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
557 struct nfs_lock_context *pos;
559 list_for_each_entry(pos, &ctx->lock_context.list, list) {
560 if (pos->lockowner != current->files)
562 if (pos->pid != current->tgid)
564 atomic_inc(&pos->count);
570 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
572 struct nfs_lock_context *res, *new = NULL;
573 struct inode *inode = ctx->dentry->d_inode;
575 spin_lock(&inode->i_lock);
576 res = __nfs_find_lock_context(ctx);
578 spin_unlock(&inode->i_lock);
579 new = kmalloc(sizeof(*new), GFP_KERNEL);
582 nfs_init_lock_context(new);
583 spin_lock(&inode->i_lock);
584 res = __nfs_find_lock_context(ctx);
586 list_add_tail(&new->list, &ctx->lock_context.list);
587 new->open_context = ctx;
592 spin_unlock(&inode->i_lock);
597 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
599 struct nfs_open_context *ctx = l_ctx->open_context;
600 struct inode *inode = ctx->dentry->d_inode;
602 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
604 list_del(&l_ctx->list);
605 spin_unlock(&inode->i_lock);
610 * nfs_close_context - Common close_context() routine NFSv2/v3
611 * @ctx: pointer to context
612 * @is_sync: is this a synchronous close
614 * always ensure that the attributes are up to date if we're mounted
615 * with close-to-open semantics
617 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
620 struct nfs_server *server;
622 if (!(ctx->mode & FMODE_WRITE))
626 inode = ctx->dentry->d_inode;
627 if (!list_empty(&NFS_I(inode)->open_files))
629 server = NFS_SERVER(inode);
630 if (server->flags & NFS_MOUNT_NOCTO)
632 nfs_revalidate_inode(server, inode);
635 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
637 struct nfs_open_context *ctx;
638 struct rpc_cred *cred = rpc_lookup_cred();
640 return ERR_CAST(cred);
642 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
645 return ERR_PTR(-ENOMEM);
647 nfs_sb_active(dentry->d_sb);
648 ctx->dentry = dget(dentry);
654 nfs_init_lock_context(&ctx->lock_context);
655 ctx->lock_context.open_context = ctx;
656 INIT_LIST_HEAD(&ctx->list);
660 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
663 atomic_inc(&ctx->lock_context.count);
667 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
669 struct inode *inode = ctx->dentry->d_inode;
670 struct super_block *sb = ctx->dentry->d_sb;
672 if (!list_empty(&ctx->list)) {
673 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
675 list_del(&ctx->list);
676 spin_unlock(&inode->i_lock);
677 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
680 NFS_PROTO(inode)->close_context(ctx, is_sync);
681 if (ctx->cred != NULL)
682 put_rpccred(ctx->cred);
688 void put_nfs_open_context(struct nfs_open_context *ctx)
690 __put_nfs_open_context(ctx, 0);
694 * Ensure that mmap has a recent RPC credential for use when writing out
697 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
699 struct inode *inode = filp->f_path.dentry->d_inode;
700 struct nfs_inode *nfsi = NFS_I(inode);
702 filp->private_data = get_nfs_open_context(ctx);
703 spin_lock(&inode->i_lock);
704 list_add(&ctx->list, &nfsi->open_files);
705 spin_unlock(&inode->i_lock);
709 * Given an inode, search for an open context with the desired characteristics
711 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
713 struct nfs_inode *nfsi = NFS_I(inode);
714 struct nfs_open_context *pos, *ctx = NULL;
716 spin_lock(&inode->i_lock);
717 list_for_each_entry(pos, &nfsi->open_files, list) {
718 if (cred != NULL && pos->cred != cred)
720 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
722 ctx = get_nfs_open_context(pos);
725 spin_unlock(&inode->i_lock);
729 static void nfs_file_clear_open_context(struct file *filp)
731 struct inode *inode = filp->f_path.dentry->d_inode;
732 struct nfs_open_context *ctx = nfs_file_open_context(filp);
735 filp->private_data = NULL;
736 spin_lock(&inode->i_lock);
737 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
738 spin_unlock(&inode->i_lock);
739 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
744 * These allocate and release file read/write context information.
746 int nfs_open(struct inode *inode, struct file *filp)
748 struct nfs_open_context *ctx;
750 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
753 nfs_file_set_open_context(filp, ctx);
754 put_nfs_open_context(ctx);
755 nfs_fscache_set_inode_cookie(inode, filp);
759 int nfs_release(struct inode *inode, struct file *filp)
761 nfs_file_clear_open_context(filp);
766 * This function is called whenever some part of NFS notices that
767 * the cached attributes have to be refreshed.
770 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
772 int status = -ESTALE;
773 struct nfs_fattr *fattr = NULL;
774 struct nfs_inode *nfsi = NFS_I(inode);
776 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
777 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
779 if (is_bad_inode(inode))
781 if (NFS_STALE(inode))
785 fattr = nfs_alloc_fattr();
789 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
790 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
792 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
794 (long long)NFS_FILEID(inode), status);
795 if (status == -ESTALE) {
796 nfs_zap_caches(inode);
797 if (!S_ISDIR(inode->i_mode))
798 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
803 status = nfs_refresh_inode(inode, fattr);
805 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
807 (long long)NFS_FILEID(inode), status);
811 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
812 nfs_zap_acl_cache(inode);
814 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
816 (long long)NFS_FILEID(inode));
819 nfs_free_fattr(fattr);
823 int nfs_attribute_timeout(struct inode *inode)
825 struct nfs_inode *nfsi = NFS_I(inode);
827 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
830 static int nfs_attribute_cache_expired(struct inode *inode)
832 if (nfs_have_delegated_attributes(inode))
834 return nfs_attribute_timeout(inode);
838 * nfs_revalidate_inode - Revalidate the inode attributes
839 * @server - pointer to nfs_server struct
840 * @inode - pointer to inode struct
842 * Updates inode attribute information by retrieving the data from the server.
844 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
846 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
847 && !nfs_attribute_cache_expired(inode))
848 return NFS_STALE(inode) ? -ESTALE : 0;
849 return __nfs_revalidate_inode(server, inode);
852 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
854 struct nfs_inode *nfsi = NFS_I(inode);
856 if (mapping->nrpages != 0) {
857 int ret = invalidate_inode_pages2(mapping);
861 spin_lock(&inode->i_lock);
862 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
863 if (S_ISDIR(inode->i_mode))
864 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
865 spin_unlock(&inode->i_lock);
866 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
867 nfs_fscache_reset_inode_cookie(inode);
868 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
869 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
874 * nfs_revalidate_mapping - Revalidate the pagecache
875 * @inode - pointer to host inode
876 * @mapping - pointer to mapping
878 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
880 struct nfs_inode *nfsi = NFS_I(inode);
883 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
884 || nfs_attribute_cache_expired(inode)
885 || NFS_STALE(inode)) {
886 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
890 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
891 ret = nfs_invalidate_mapping(inode, mapping);
896 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
898 struct nfs_inode *nfsi = NFS_I(inode);
899 unsigned long ret = 0;
901 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
902 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
903 && inode->i_version == fattr->pre_change_attr) {
904 inode->i_version = fattr->change_attr;
905 if (S_ISDIR(inode->i_mode))
906 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
907 ret |= NFS_INO_INVALID_ATTR;
909 /* If we have atomic WCC data, we may update some attributes */
910 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
911 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
912 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
913 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
914 ret |= NFS_INO_INVALID_ATTR;
917 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
918 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
919 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
920 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
921 if (S_ISDIR(inode->i_mode))
922 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
923 ret |= NFS_INO_INVALID_ATTR;
925 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
926 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
927 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
928 && nfsi->npages == 0) {
929 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
930 ret |= NFS_INO_INVALID_ATTR;
936 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
937 * @inode - pointer to inode
938 * @fattr - updated attributes
940 * Verifies the attribute cache. If we have just changed the attributes,
941 * so that fattr carries weak cache consistency data, then it may
942 * also update the ctime/mtime/change_attribute.
944 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
946 struct nfs_inode *nfsi = NFS_I(inode);
947 loff_t cur_size, new_isize;
948 unsigned long invalid = 0;
951 /* Has the inode gone and changed behind our back? */
952 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
954 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
957 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
958 inode->i_version != fattr->change_attr)
959 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
961 /* Verify a few of the more important attributes */
962 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
963 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
965 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
966 cur_size = i_size_read(inode);
967 new_isize = nfs_size_to_loff_t(fattr->size);
968 if (cur_size != new_isize && nfsi->npages == 0)
969 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
972 /* Have any file permissions changed? */
973 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
974 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
975 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
976 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
977 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
978 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
980 /* Has the link count changed? */
981 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
982 invalid |= NFS_INO_INVALID_ATTR;
984 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
985 invalid |= NFS_INO_INVALID_ATIME;
988 nfsi->cache_validity |= invalid;
990 nfsi->read_cache_jiffies = fattr->time_start;
994 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
996 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
998 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1001 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1003 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1005 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1008 static atomic_long_t nfs_attr_generation_counter;
1010 static unsigned long nfs_read_attr_generation_counter(void)
1012 return atomic_long_read(&nfs_attr_generation_counter);
1015 unsigned long nfs_inc_attr_generation_counter(void)
1017 return atomic_long_inc_return(&nfs_attr_generation_counter);
1020 void nfs_fattr_init(struct nfs_fattr *fattr)
1023 fattr->time_start = jiffies;
1024 fattr->gencount = nfs_inc_attr_generation_counter();
1025 fattr->owner_name = NULL;
1026 fattr->group_name = NULL;
1029 struct nfs_fattr *nfs_alloc_fattr(void)
1031 struct nfs_fattr *fattr;
1033 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1035 nfs_fattr_init(fattr);
1039 struct nfs_fh *nfs_alloc_fhandle(void)
1043 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1051 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1052 * in the same way that wireshark does
1056 * For debugging only.
1058 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1060 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1061 * not on the result */
1062 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1066 * _nfs_display_fhandle - display an NFS file handle on the console
1068 * @fh: file handle to display
1069 * @caption: display caption
1071 * For debugging only.
1073 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1077 if (fh == NULL || fh->size == 0) {
1078 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1082 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1083 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1084 for (i = 0; i < fh->size; i += 16) {
1085 __be32 *pos = (__be32 *)&fh->data[i];
1087 switch ((fh->size - i - 1) >> 2) {
1089 printk(KERN_DEFAULT " %08x\n",
1093 printk(KERN_DEFAULT " %08x %08x\n",
1094 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1097 printk(KERN_DEFAULT " %08x %08x %08x\n",
1098 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1099 be32_to_cpup(pos + 2));
1102 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1103 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1104 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1111 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1112 * @inode - pointer to inode
1113 * @fattr - attributes
1115 * Attempt to divine whether or not an RPC call reply carrying stale
1116 * attributes got scheduled after another call carrying updated ones.
1118 * To do so, the function first assumes that a more recent ctime means
1119 * that the attributes in fattr are newer, however it also attempt to
1120 * catch the case where ctime either didn't change, or went backwards
1121 * (if someone reset the clock on the server) by looking at whether
1122 * or not this RPC call was started after the inode was last updated.
1123 * Note also the check for wraparound of 'attr_gencount'
1125 * The function returns 'true' if it thinks the attributes in 'fattr' are
1126 * more recent than the ones cached in the inode.
1129 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1131 const struct nfs_inode *nfsi = NFS_I(inode);
1133 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1134 nfs_ctime_need_update(inode, fattr) ||
1135 nfs_size_need_update(inode, fattr) ||
1136 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1139 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1141 if (nfs_inode_attrs_need_update(inode, fattr))
1142 return nfs_update_inode(inode, fattr);
1143 return nfs_check_inode_attributes(inode, fattr);
1147 * nfs_refresh_inode - try to update the inode attribute cache
1148 * @inode - pointer to inode
1149 * @fattr - updated attributes
1151 * Check that an RPC call that returned attributes has not overlapped with
1152 * other recent updates of the inode metadata, then decide whether it is
1153 * safe to do a full update of the inode attributes, or whether just to
1154 * call nfs_check_inode_attributes.
1156 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1160 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1162 spin_lock(&inode->i_lock);
1163 status = nfs_refresh_inode_locked(inode, fattr);
1164 spin_unlock(&inode->i_lock);
1169 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1171 struct nfs_inode *nfsi = NFS_I(inode);
1173 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1174 if (S_ISDIR(inode->i_mode))
1175 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1176 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1178 return nfs_refresh_inode_locked(inode, fattr);
1182 * nfs_post_op_update_inode - try to update the inode attribute cache
1183 * @inode - pointer to inode
1184 * @fattr - updated attributes
1186 * After an operation that has changed the inode metadata, mark the
1187 * attribute cache as being invalid, then try to update it.
1189 * NB: if the server didn't return any post op attributes, this
1190 * function will force the retrieval of attributes before the next
1191 * NFS request. Thus it should be used only for operations that
1192 * are expected to change one or more attributes, to avoid
1193 * unnecessary NFS requests and trips through nfs_update_inode().
1195 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1199 spin_lock(&inode->i_lock);
1200 status = nfs_post_op_update_inode_locked(inode, fattr);
1201 spin_unlock(&inode->i_lock);
1206 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1207 * @inode - pointer to inode
1208 * @fattr - updated attributes
1210 * After an operation that has changed the inode metadata, mark the
1211 * attribute cache as being invalid, then try to update it. Fake up
1212 * weak cache consistency data, if none exist.
1214 * This function is mainly designed to be used by the ->write_done() functions.
1216 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1220 spin_lock(&inode->i_lock);
1221 /* Don't do a WCC update if these attributes are already stale */
1222 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1223 !nfs_inode_attrs_need_update(inode, fattr)) {
1224 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1225 | NFS_ATTR_FATTR_PRESIZE
1226 | NFS_ATTR_FATTR_PREMTIME
1227 | NFS_ATTR_FATTR_PRECTIME);
1230 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1231 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1232 fattr->pre_change_attr = inode->i_version;
1233 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1235 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1236 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1237 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1238 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1240 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1241 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1242 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1243 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1245 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1246 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1247 fattr->pre_size = i_size_read(inode);
1248 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1251 status = nfs_post_op_update_inode_locked(inode, fattr);
1252 spin_unlock(&inode->i_lock);
1257 * Many nfs protocol calls return the new file attributes after
1258 * an operation. Here we update the inode to reflect the state
1259 * of the server's inode.
1261 * This is a bit tricky because we have to make sure all dirty pages
1262 * have been sent off to the server before calling invalidate_inode_pages.
1263 * To make sure no other process adds more write requests while we try
1264 * our best to flush them, we make them sleep during the attribute refresh.
1266 * A very similar scenario holds for the dir cache.
1268 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1270 struct nfs_server *server;
1271 struct nfs_inode *nfsi = NFS_I(inode);
1272 loff_t cur_isize, new_isize;
1273 unsigned long invalid = 0;
1274 unsigned long now = jiffies;
1275 unsigned long save_cache_validity;
1277 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1278 __func__, inode->i_sb->s_id, inode->i_ino,
1279 nfs_display_fhandle_hash(NFS_FH(inode)),
1280 atomic_read(&inode->i_count), fattr->valid);
1282 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1286 * Make sure the inode's type hasn't changed.
1288 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1291 server = NFS_SERVER(inode);
1292 /* Update the fsid? */
1293 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1294 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1295 !IS_AUTOMOUNT(inode))
1296 server->fsid = fattr->fsid;
1299 * Update the read time so we don't revalidate too often.
1301 nfsi->read_cache_jiffies = fattr->time_start;
1303 save_cache_validity = nfsi->cache_validity;
1304 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1305 | NFS_INO_INVALID_ATIME
1306 | NFS_INO_REVAL_FORCED
1307 | NFS_INO_REVAL_PAGECACHE);
1309 /* Do atomic weak cache consistency updates */
1310 invalid |= nfs_wcc_update_inode(inode, fattr);
1312 /* More cache consistency checks */
1313 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1314 if (inode->i_version != fattr->change_attr) {
1315 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1316 inode->i_sb->s_id, inode->i_ino);
1317 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1318 if (S_ISDIR(inode->i_mode))
1319 nfs_force_lookup_revalidate(inode);
1320 inode->i_version = fattr->change_attr;
1322 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1323 invalid |= save_cache_validity;
1325 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1326 /* NFSv2/v3: Check if the mtime agrees */
1327 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1328 dprintk("NFS: mtime change on server for file %s/%ld\n",
1329 inode->i_sb->s_id, inode->i_ino);
1330 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1331 if (S_ISDIR(inode->i_mode))
1332 nfs_force_lookup_revalidate(inode);
1333 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1335 } else if (server->caps & NFS_CAP_MTIME)
1336 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1337 | NFS_INO_INVALID_DATA
1338 | NFS_INO_REVAL_PAGECACHE
1339 | NFS_INO_REVAL_FORCED);
1341 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1342 /* If ctime has changed we should definitely clear access+acl caches */
1343 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1344 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1345 /* and probably clear data for a directory too as utimes can cause
1346 * havoc with our cache.
1348 if (S_ISDIR(inode->i_mode)) {
1349 invalid |= NFS_INO_INVALID_DATA;
1350 nfs_force_lookup_revalidate(inode);
1352 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1354 } else if (server->caps & NFS_CAP_CTIME)
1355 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1356 | NFS_INO_INVALID_ACCESS
1357 | NFS_INO_INVALID_ACL
1358 | NFS_INO_REVAL_FORCED);
1360 /* Check if our cached file size is stale */
1361 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1362 new_isize = nfs_size_to_loff_t(fattr->size);
1363 cur_isize = i_size_read(inode);
1364 if (new_isize != cur_isize) {
1365 /* Do we perhaps have any outstanding writes, or has
1366 * the file grown beyond our last write? */
1367 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1368 new_isize > cur_isize) {
1369 i_size_write(inode, new_isize);
1370 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1372 dprintk("NFS: isize change on server for file %s/%ld "
1376 (long long)cur_isize,
1377 (long long)new_isize);
1380 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1381 | NFS_INO_REVAL_PAGECACHE
1382 | NFS_INO_REVAL_FORCED);
1385 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1386 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1387 else if (server->caps & NFS_CAP_ATIME)
1388 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1389 | NFS_INO_REVAL_FORCED);
1391 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1392 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1393 umode_t newmode = inode->i_mode & S_IFMT;
1394 newmode |= fattr->mode & S_IALLUGO;
1395 inode->i_mode = newmode;
1396 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1398 } else if (server->caps & NFS_CAP_MODE)
1399 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1400 | NFS_INO_INVALID_ACCESS
1401 | NFS_INO_INVALID_ACL
1402 | NFS_INO_REVAL_FORCED);
1404 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1405 if (inode->i_uid != fattr->uid) {
1406 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1407 inode->i_uid = fattr->uid;
1409 } else if (server->caps & NFS_CAP_OWNER)
1410 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1411 | NFS_INO_INVALID_ACCESS
1412 | NFS_INO_INVALID_ACL
1413 | NFS_INO_REVAL_FORCED);
1415 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1416 if (inode->i_gid != fattr->gid) {
1417 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1418 inode->i_gid = fattr->gid;
1420 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1421 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1422 | NFS_INO_INVALID_ACCESS
1423 | NFS_INO_INVALID_ACL
1424 | NFS_INO_REVAL_FORCED);
1426 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1427 if (inode->i_nlink != fattr->nlink) {
1428 invalid |= NFS_INO_INVALID_ATTR;
1429 if (S_ISDIR(inode->i_mode))
1430 invalid |= NFS_INO_INVALID_DATA;
1431 set_nlink(inode, fattr->nlink);
1433 } else if (server->caps & NFS_CAP_NLINK)
1434 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1435 | NFS_INO_REVAL_FORCED);
1437 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1439 * report the blocks in 512byte units
1441 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1443 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1444 inode->i_blocks = fattr->du.nfs2.blocks;
1446 /* Update attrtimeo value if we're out of the unstable period */
1447 if (invalid & NFS_INO_INVALID_ATTR) {
1448 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1449 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1450 nfsi->attrtimeo_timestamp = now;
1451 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1453 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1454 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1455 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1456 nfsi->attrtimeo_timestamp = now;
1459 invalid &= ~NFS_INO_INVALID_ATTR;
1460 /* Don't invalidate the data if we were to blame */
1461 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1462 || S_ISLNK(inode->i_mode)))
1463 invalid &= ~NFS_INO_INVALID_DATA;
1464 if (!nfs_have_delegation(inode, FMODE_READ) ||
1465 (save_cache_validity & NFS_INO_REVAL_FORCED))
1466 nfsi->cache_validity |= invalid;
1471 * Big trouble! The inode has become a different object.
1473 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1474 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1477 * No need to worry about unhashing the dentry, as the
1478 * lookup validation will know that the inode is bad.
1479 * (But we fall through to invalidate the caches.)
1481 nfs_invalidate_inode(inode);
1485 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1486 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1487 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
1488 (long long)nfsi->fileid, (long long)fattr->fileid);
1493 #ifdef CONFIG_NFS_V4
1496 * Clean out any remaining NFSv4 state that might be left over due
1497 * to open() calls that passed nfs_atomic_lookup, but failed to call
1500 void nfs4_evict_inode(struct inode *inode)
1502 truncate_inode_pages(&inode->i_data, 0);
1503 end_writeback(inode);
1504 pnfs_return_layout(inode);
1505 pnfs_destroy_layout(NFS_I(inode));
1506 /* If we are holding a delegation, return it! */
1507 nfs_inode_return_delegation_noreclaim(inode);
1508 /* First call standard NFS clear_inode() code */
1509 nfs_clear_inode(inode);
1513 struct inode *nfs_alloc_inode(struct super_block *sb)
1515 struct nfs_inode *nfsi;
1516 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1520 nfsi->cache_validity = 0UL;
1521 #ifdef CONFIG_NFS_V3_ACL
1522 nfsi->acl_access = ERR_PTR(-EAGAIN);
1523 nfsi->acl_default = ERR_PTR(-EAGAIN);
1525 #ifdef CONFIG_NFS_V4
1526 nfsi->nfs4_acl = NULL;
1527 #endif /* CONFIG_NFS_V4 */
1528 return &nfsi->vfs_inode;
1531 static void nfs_i_callback(struct rcu_head *head)
1533 struct inode *inode = container_of(head, struct inode, i_rcu);
1534 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1537 void nfs_destroy_inode(struct inode *inode)
1539 call_rcu(&inode->i_rcu, nfs_i_callback);
1542 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1544 #ifdef CONFIG_NFS_V4
1545 INIT_LIST_HEAD(&nfsi->open_states);
1546 nfsi->delegation = NULL;
1547 nfsi->delegation_state = 0;
1548 init_rwsem(&nfsi->rwsem);
1549 nfsi->layout = NULL;
1550 atomic_set(&nfsi->commits_outstanding, 0);
1554 static void init_once(void *foo)
1556 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1558 inode_init_once(&nfsi->vfs_inode);
1559 INIT_LIST_HEAD(&nfsi->open_files);
1560 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1561 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1562 INIT_LIST_HEAD(&nfsi->commit_list);
1565 atomic_set(&nfsi->silly_count, 1);
1566 INIT_HLIST_HEAD(&nfsi->silly_list);
1567 init_waitqueue_head(&nfsi->waitqueue);
1568 nfs4_init_once(nfsi);
1571 static int __init nfs_init_inodecache(void)
1573 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1574 sizeof(struct nfs_inode),
1575 0, (SLAB_RECLAIM_ACCOUNT|
1578 if (nfs_inode_cachep == NULL)
1584 static void nfs_destroy_inodecache(void)
1586 kmem_cache_destroy(nfs_inode_cachep);
1589 struct workqueue_struct *nfsiod_workqueue;
1592 * start up the nfsiod workqueue
1594 static int nfsiod_start(void)
1596 struct workqueue_struct *wq;
1597 dprintk("RPC: creating workqueue nfsiod\n");
1598 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1601 nfsiod_workqueue = wq;
1606 * Destroy the nfsiod workqueue
1608 static void nfsiod_stop(void)
1610 struct workqueue_struct *wq;
1612 wq = nfsiod_workqueue;
1615 nfsiod_workqueue = NULL;
1616 destroy_workqueue(wq);
1620 EXPORT_SYMBOL_GPL(nfs_net_id);
1622 static int nfs_net_init(struct net *net)
1624 nfs_clients_init(net);
1625 return nfs_dns_resolver_cache_init(net);
1628 static void nfs_net_exit(struct net *net)
1630 nfs_dns_resolver_cache_destroy(net);
1631 nfs_cleanup_cb_ident_idr(net);
1634 static struct pernet_operations nfs_net_ops = {
1635 .init = nfs_net_init,
1636 .exit = nfs_net_exit,
1638 .size = sizeof(struct nfs_net),
1644 static int __init init_nfs_fs(void)
1648 err = nfs_idmap_init();
1652 err = nfs_dns_resolver_init();
1656 err = register_pernet_subsys(&nfs_net_ops);
1660 err = nfs_fscache_register();
1664 err = nfsiod_start();
1668 err = nfs_fs_proc_init();
1672 err = nfs_init_nfspagecache();
1676 err = nfs_init_inodecache();
1680 err = nfs_init_readpagecache();
1684 err = nfs_init_writepagecache();
1688 err = nfs_init_directcache();
1692 #ifdef CONFIG_PROC_FS
1693 rpc_proc_register(&init_net, &nfs_rpcstat);
1695 if ((err = register_nfs_fs()) != 0)
1699 #ifdef CONFIG_PROC_FS
1700 rpc_proc_unregister(&init_net, "nfs");
1702 nfs_destroy_directcache();
1704 nfs_destroy_writepagecache();
1706 nfs_destroy_readpagecache();
1708 nfs_destroy_inodecache();
1710 nfs_destroy_nfspagecache();
1716 nfs_fscache_unregister();
1718 unregister_pernet_subsys(&nfs_net_ops);
1720 nfs_dns_resolver_destroy();
1727 static void __exit exit_nfs_fs(void)
1729 nfs_destroy_directcache();
1730 nfs_destroy_writepagecache();
1731 nfs_destroy_readpagecache();
1732 nfs_destroy_inodecache();
1733 nfs_destroy_nfspagecache();
1734 nfs_fscache_unregister();
1735 unregister_pernet_subsys(&nfs_net_ops);
1736 nfs_dns_resolver_destroy();
1738 #ifdef CONFIG_PROC_FS
1739 rpc_proc_unregister(&init_net, "nfs");
1741 unregister_nfs_fs();
1746 /* Not quite true; I just maintain it */
1747 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1748 MODULE_LICENSE("GPL");
1749 module_param(enable_ino64, bool, 0644);
1751 module_init(init_nfs_fs)
1752 module_exit(exit_nfs_fs)