4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
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/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38 #include <linux/slab.h>
39 #include <linux/compat.h>
40 #include <linux/freezer.h>
41 #include <linux/crc32.h>
43 #include <asm/uaccess.h>
47 #include "delegation.h"
51 #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))
85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
88 * nfs_compat_user_ino64 - returns the user-visible inode number
89 * @fileid: 64-bit fileid
91 * This function returns a 32-bit inode number if the boot parameter
92 * nfs.enable_ino64 is zero.
94 u64 nfs_compat_user_ino64(u64 fileid)
105 if (sizeof(ino) < sizeof(fileid))
106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
110 int nfs_drop_inode(struct inode *inode)
112 return NFS_STALE(inode) || generic_drop_inode(inode);
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
116 void nfs_clear_inode(struct inode *inode)
119 * The following should never happen...
121 WARN_ON_ONCE(nfs_have_writebacks(inode));
122 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123 nfs_zap_acl_cache(inode);
124 nfs_access_zap_cache(inode);
125 nfs_fscache_release_inode_cookie(inode);
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
129 void nfs_evict_inode(struct inode *inode)
131 truncate_inode_pages(&inode->i_data, 0);
133 nfs_clear_inode(inode);
137 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
139 int nfs_sync_mapping(struct address_space *mapping)
143 if (mapping->nrpages != 0) {
144 unmap_mapping_range(mapping, 0, 0, 0);
145 ret = nfs_wb_all(mapping->host);
151 * Invalidate the local caches
153 static void nfs_zap_caches_locked(struct inode *inode)
155 struct nfs_inode *nfsi = NFS_I(inode);
156 int mode = inode->i_mode;
158 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
160 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
161 nfsi->attrtimeo_timestamp = jiffies;
163 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
164 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
165 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
166 nfs_fscache_invalidate(inode);
168 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
172 void nfs_zap_caches(struct inode *inode)
174 spin_lock(&inode->i_lock);
175 nfs_zap_caches_locked(inode);
176 spin_unlock(&inode->i_lock);
179 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
181 if (mapping->nrpages != 0) {
182 spin_lock(&inode->i_lock);
183 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
184 nfs_fscache_invalidate(inode);
185 spin_unlock(&inode->i_lock);
189 void nfs_zap_acl_cache(struct inode *inode)
191 void (*clear_acl_cache)(struct inode *);
193 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
194 if (clear_acl_cache != NULL)
195 clear_acl_cache(inode);
196 spin_lock(&inode->i_lock);
197 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
198 spin_unlock(&inode->i_lock);
200 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
202 void nfs_invalidate_atime(struct inode *inode)
204 spin_lock(&inode->i_lock);
205 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
206 spin_unlock(&inode->i_lock);
208 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
211 * Invalidate, but do not unhash, the inode.
212 * NB: must be called with inode->i_lock held!
214 static void nfs_invalidate_inode(struct inode *inode)
216 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
217 nfs_zap_caches_locked(inode);
220 struct nfs_find_desc {
222 struct nfs_fattr *fattr;
226 * In NFSv3 we can have 64bit inode numbers. In order to support
227 * this, and re-exported directories (also seen in NFSv2)
228 * we are forced to allow 2 different inodes to have the same
232 nfs_find_actor(struct inode *inode, void *opaque)
234 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
235 struct nfs_fh *fh = desc->fh;
236 struct nfs_fattr *fattr = desc->fattr;
238 if (NFS_FILEID(inode) != fattr->fileid)
240 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
242 if (nfs_compare_fh(NFS_FH(inode), fh))
244 if (is_bad_inode(inode) || NFS_STALE(inode))
250 nfs_init_locked(struct inode *inode, void *opaque)
252 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
253 struct nfs_fattr *fattr = desc->fattr;
255 set_nfs_fileid(inode, fattr->fileid);
256 nfs_copy_fh(NFS_FH(inode), desc->fh);
261 * This is our front-end to iget that looks up inodes by file handle
262 * instead of inode number.
265 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
267 struct nfs_find_desc desc = {
271 struct inode *inode = ERR_PTR(-ENOENT);
274 nfs_attr_check_mountpoint(sb, fattr);
276 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
277 !nfs_attr_use_mounted_on_fileid(fattr))
279 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
282 hash = nfs_fattr_to_ino_t(fattr);
284 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
286 inode = ERR_PTR(-ENOMEM);
290 if (inode->i_state & I_NEW) {
291 struct nfs_inode *nfsi = NFS_I(inode);
292 unsigned long now = jiffies;
294 /* We set i_ino for the few things that still rely on it,
298 /* We can't support update_atime(), since the server will reset it */
299 inode->i_flags |= S_NOATIME|S_NOCMTIME;
300 inode->i_mode = fattr->mode;
301 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
302 && nfs_server_capable(inode, NFS_CAP_MODE))
303 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
304 /* Why so? Because we want revalidate for devices/FIFOs, and
305 * that's precisely what we have in nfs_file_inode_operations.
307 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
308 if (S_ISREG(inode->i_mode)) {
309 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
310 inode->i_data.a_ops = &nfs_file_aops;
311 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
312 } else if (S_ISDIR(inode->i_mode)) {
313 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
314 inode->i_fop = &nfs_dir_operations;
315 inode->i_data.a_ops = &nfs_dir_aops;
316 /* Deal with crossing mountpoints */
317 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
318 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
319 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
320 inode->i_op = &nfs_referral_inode_operations;
322 inode->i_op = &nfs_mountpoint_inode_operations;
324 inode->i_flags |= S_AUTOMOUNT;
326 } else if (S_ISLNK(inode->i_mode))
327 inode->i_op = &nfs_symlink_inode_operations;
329 init_special_inode(inode, inode->i_mode, fattr->rdev);
331 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
332 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
333 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
334 inode->i_version = 0;
337 inode->i_uid = make_kuid(&init_user_ns, -2);
338 inode->i_gid = make_kgid(&init_user_ns, -2);
340 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
344 nfsi->read_cache_jiffies = fattr->time_start;
345 nfsi->attr_gencount = fattr->gencount;
346 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
347 inode->i_atime = fattr->atime;
348 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
349 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
350 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
351 inode->i_mtime = fattr->mtime;
352 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
353 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
354 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
355 inode->i_ctime = fattr->ctime;
356 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
357 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
358 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
359 inode->i_version = fattr->change_attr;
360 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
361 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
362 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
363 inode->i_size = nfs_size_to_loff_t(fattr->size);
365 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
366 | NFS_INO_REVAL_PAGECACHE;
367 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
368 set_nlink(inode, fattr->nlink);
369 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
370 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
371 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
372 inode->i_uid = fattr->uid;
373 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
374 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
375 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
376 inode->i_gid = fattr->gid;
377 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
378 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
379 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
380 inode->i_blocks = fattr->du.nfs2.blocks;
381 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
383 * report the blocks in 512byte units
385 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
387 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
388 nfsi->attrtimeo_timestamp = now;
389 nfsi->access_cache = RB_ROOT;
391 nfs_fscache_init_inode_cookie(inode);
393 unlock_new_inode(inode);
395 nfs_refresh_inode(inode, fattr);
396 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
398 (long long)NFS_FILEID(inode),
399 nfs_display_fhandle_hash(fh),
400 atomic_read(&inode->i_count));
406 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
409 EXPORT_SYMBOL_GPL(nfs_fhget);
411 #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)
414 nfs_setattr(struct dentry *dentry, struct iattr *attr)
416 struct inode *inode = dentry->d_inode;
417 struct nfs_fattr *fattr;
420 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
422 /* skip mode change if it's just for clearing setuid/setgid */
423 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
424 attr->ia_valid &= ~ATTR_MODE;
426 if (attr->ia_valid & ATTR_SIZE) {
427 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
428 attr->ia_valid &= ~ATTR_SIZE;
431 /* Optimization: if the end result is no change, don't RPC */
432 attr->ia_valid &= NFS_VALID_ATTRS;
433 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
436 /* Write all dirty data */
437 if (S_ISREG(inode->i_mode)) {
438 nfs_inode_dio_wait(inode);
442 fattr = nfs_alloc_fattr();
446 * Return any delegations if we're going to change ACLs
448 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
449 NFS_PROTO(inode)->return_delegation(inode);
450 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
452 nfs_refresh_inode(inode, fattr);
453 nfs_free_fattr(fattr);
457 EXPORT_SYMBOL_GPL(nfs_setattr);
460 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
461 * @inode: inode of the file used
462 * @offset: file offset to start truncating
464 * This is a copy of the common vmtruncate, but with the locking
465 * corrected to take into account the fact that NFS requires
466 * inode->i_size to be updated under the inode->i_lock.
468 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
473 err = inode_newsize_ok(inode, offset);
477 spin_lock(&inode->i_lock);
478 oldsize = inode->i_size;
479 i_size_write(inode, offset);
480 spin_unlock(&inode->i_lock);
482 truncate_pagecache(inode, oldsize, offset);
488 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
489 * @inode: pointer to struct inode
490 * @attr: pointer to struct iattr
492 * Note: we do this in the *proc.c in order to ensure that
493 * it works for things like exclusive creates too.
495 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
497 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
498 spin_lock(&inode->i_lock);
499 if ((attr->ia_valid & ATTR_MODE) != 0) {
500 int mode = attr->ia_mode & S_IALLUGO;
501 mode |= inode->i_mode & ~S_IALLUGO;
502 inode->i_mode = mode;
504 if ((attr->ia_valid & ATTR_UID) != 0)
505 inode->i_uid = attr->ia_uid;
506 if ((attr->ia_valid & ATTR_GID) != 0)
507 inode->i_gid = attr->ia_gid;
508 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
509 spin_unlock(&inode->i_lock);
511 if ((attr->ia_valid & ATTR_SIZE) != 0) {
512 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
513 nfs_vmtruncate(inode, attr->ia_size);
516 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
518 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
520 struct inode *inode = dentry->d_inode;
521 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
524 /* Flush out writes to the server in order to update c/mtime. */
525 if (S_ISREG(inode->i_mode)) {
526 nfs_inode_dio_wait(inode);
527 err = filemap_write_and_wait(inode->i_mapping);
533 * We may force a getattr if the user cares about atime.
535 * Note that we only have to check the vfsmount flags here:
536 * - NFS always sets S_NOATIME by so checking it would give a
538 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
539 * no point in checking those.
541 if ((mnt->mnt_flags & MNT_NOATIME) ||
542 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
546 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
548 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
550 generic_fillattr(inode, stat);
551 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
556 EXPORT_SYMBOL_GPL(nfs_getattr);
558 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
560 atomic_set(&l_ctx->count, 1);
561 l_ctx->lockowner.l_owner = current->files;
562 l_ctx->lockowner.l_pid = current->tgid;
563 INIT_LIST_HEAD(&l_ctx->list);
566 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
568 struct nfs_lock_context *pos;
570 list_for_each_entry(pos, &ctx->lock_context.list, list) {
571 if (pos->lockowner.l_owner != current->files)
573 if (pos->lockowner.l_pid != current->tgid)
575 atomic_inc(&pos->count);
581 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
583 struct nfs_lock_context *res, *new = NULL;
584 struct inode *inode = ctx->dentry->d_inode;
586 spin_lock(&inode->i_lock);
587 res = __nfs_find_lock_context(ctx);
589 spin_unlock(&inode->i_lock);
590 new = kmalloc(sizeof(*new), GFP_KERNEL);
592 return ERR_PTR(-ENOMEM);
593 nfs_init_lock_context(new);
594 spin_lock(&inode->i_lock);
595 res = __nfs_find_lock_context(ctx);
597 list_add_tail(&new->list, &ctx->lock_context.list);
598 new->open_context = ctx;
603 spin_unlock(&inode->i_lock);
608 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
610 struct nfs_open_context *ctx = l_ctx->open_context;
611 struct inode *inode = ctx->dentry->d_inode;
613 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
615 list_del(&l_ctx->list);
616 spin_unlock(&inode->i_lock);
621 * nfs_close_context - Common close_context() routine NFSv2/v3
622 * @ctx: pointer to context
623 * @is_sync: is this a synchronous close
625 * always ensure that the attributes are up to date if we're mounted
626 * with close-to-open semantics
628 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
631 struct nfs_server *server;
633 if (!(ctx->mode & FMODE_WRITE))
637 inode = ctx->dentry->d_inode;
638 if (!list_empty(&NFS_I(inode)->open_files))
640 server = NFS_SERVER(inode);
641 if (server->flags & NFS_MOUNT_NOCTO)
643 nfs_revalidate_inode(server, inode);
645 EXPORT_SYMBOL_GPL(nfs_close_context);
647 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
649 struct nfs_open_context *ctx;
650 struct rpc_cred *cred = rpc_lookup_cred();
652 return ERR_CAST(cred);
654 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
657 return ERR_PTR(-ENOMEM);
659 nfs_sb_active(dentry->d_sb);
660 ctx->dentry = dget(dentry);
666 nfs_init_lock_context(&ctx->lock_context);
667 ctx->lock_context.open_context = ctx;
668 INIT_LIST_HEAD(&ctx->list);
669 ctx->mdsthreshold = NULL;
672 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
674 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
677 atomic_inc(&ctx->lock_context.count);
680 EXPORT_SYMBOL_GPL(get_nfs_open_context);
682 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
684 struct inode *inode = ctx->dentry->d_inode;
685 struct super_block *sb = ctx->dentry->d_sb;
687 if (!list_empty(&ctx->list)) {
688 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
690 list_del(&ctx->list);
691 spin_unlock(&inode->i_lock);
692 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
695 NFS_PROTO(inode)->close_context(ctx, is_sync);
696 if (ctx->cred != NULL)
697 put_rpccred(ctx->cred);
700 kfree(ctx->mdsthreshold);
704 void put_nfs_open_context(struct nfs_open_context *ctx)
706 __put_nfs_open_context(ctx, 0);
708 EXPORT_SYMBOL_GPL(put_nfs_open_context);
711 * Ensure that mmap has a recent RPC credential for use when writing out
714 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
716 struct inode *inode = file_inode(filp);
717 struct nfs_inode *nfsi = NFS_I(inode);
719 filp->private_data = get_nfs_open_context(ctx);
720 spin_lock(&inode->i_lock);
721 list_add(&ctx->list, &nfsi->open_files);
722 spin_unlock(&inode->i_lock);
724 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
727 * Given an inode, search for an open context with the desired characteristics
729 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
731 struct nfs_inode *nfsi = NFS_I(inode);
732 struct nfs_open_context *pos, *ctx = NULL;
734 spin_lock(&inode->i_lock);
735 list_for_each_entry(pos, &nfsi->open_files, list) {
736 if (cred != NULL && pos->cred != cred)
738 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
740 ctx = get_nfs_open_context(pos);
743 spin_unlock(&inode->i_lock);
747 static void nfs_file_clear_open_context(struct file *filp)
749 struct inode *inode = file_inode(filp);
750 struct nfs_open_context *ctx = nfs_file_open_context(filp);
753 filp->private_data = NULL;
754 spin_lock(&inode->i_lock);
755 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
756 spin_unlock(&inode->i_lock);
757 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
762 * These allocate and release file read/write context information.
764 int nfs_open(struct inode *inode, struct file *filp)
766 struct nfs_open_context *ctx;
768 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
771 nfs_file_set_open_context(filp, ctx);
772 put_nfs_open_context(ctx);
773 nfs_fscache_set_inode_cookie(inode, filp);
777 int nfs_release(struct inode *inode, struct file *filp)
779 nfs_file_clear_open_context(filp);
784 * This function is called whenever some part of NFS notices that
785 * the cached attributes have to be refreshed.
788 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
790 int status = -ESTALE;
791 struct nfs_fattr *fattr = NULL;
792 struct nfs_inode *nfsi = NFS_I(inode);
794 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
795 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
797 if (is_bad_inode(inode))
799 if (NFS_STALE(inode))
803 fattr = nfs_alloc_fattr();
807 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
808 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
810 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
812 (long long)NFS_FILEID(inode), status);
813 if (status == -ESTALE) {
814 nfs_zap_caches(inode);
815 if (!S_ISDIR(inode->i_mode))
816 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
821 status = nfs_refresh_inode(inode, fattr);
823 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
825 (long long)NFS_FILEID(inode), status);
829 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
830 nfs_zap_acl_cache(inode);
832 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
834 (long long)NFS_FILEID(inode));
837 nfs_free_fattr(fattr);
841 int nfs_attribute_timeout(struct inode *inode)
843 struct nfs_inode *nfsi = NFS_I(inode);
845 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
848 static int nfs_attribute_cache_expired(struct inode *inode)
850 if (nfs_have_delegated_attributes(inode))
852 return nfs_attribute_timeout(inode);
856 * nfs_revalidate_inode - Revalidate the inode attributes
857 * @server - pointer to nfs_server struct
858 * @inode - pointer to inode struct
860 * Updates inode attribute information by retrieving the data from the server.
862 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
864 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
865 && !nfs_attribute_cache_expired(inode))
866 return NFS_STALE(inode) ? -ESTALE : 0;
867 return __nfs_revalidate_inode(server, inode);
869 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
871 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
873 struct nfs_inode *nfsi = NFS_I(inode);
875 if (mapping->nrpages != 0) {
876 int ret = invalidate_inode_pages2(mapping);
880 spin_lock(&inode->i_lock);
881 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
882 if (S_ISDIR(inode->i_mode))
883 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
884 spin_unlock(&inode->i_lock);
885 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
886 nfs_fscache_wait_on_invalidate(inode);
887 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
888 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
892 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
894 if (nfs_have_delegated_attributes(inode))
896 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
897 || nfs_attribute_timeout(inode)
902 * nfs_revalidate_mapping - Revalidate the pagecache
903 * @inode - pointer to host inode
904 * @mapping - pointer to mapping
906 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
908 struct nfs_inode *nfsi = NFS_I(inode);
911 /* swapfiles are not supposed to be shared. */
912 if (IS_SWAPFILE(inode))
915 if (nfs_mapping_need_revalidate_inode(inode)) {
916 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
920 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
921 ret = nfs_invalidate_mapping(inode, mapping);
926 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
928 struct nfs_inode *nfsi = NFS_I(inode);
929 unsigned long ret = 0;
931 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
932 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
933 && inode->i_version == fattr->pre_change_attr) {
934 inode->i_version = fattr->change_attr;
935 if (S_ISDIR(inode->i_mode))
936 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
937 ret |= NFS_INO_INVALID_ATTR;
939 /* If we have atomic WCC data, we may update some attributes */
940 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
941 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
942 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
943 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
944 ret |= NFS_INO_INVALID_ATTR;
947 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
948 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
949 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
950 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
951 if (S_ISDIR(inode->i_mode))
952 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
953 ret |= NFS_INO_INVALID_ATTR;
955 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
956 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
957 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
958 && nfsi->npages == 0) {
959 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
960 ret |= NFS_INO_INVALID_ATTR;
963 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
964 nfs_fscache_invalidate(inode);
970 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
971 * @inode - pointer to inode
972 * @fattr - updated attributes
974 * Verifies the attribute cache. If we have just changed the attributes,
975 * so that fattr carries weak cache consistency data, then it may
976 * also update the ctime/mtime/change_attribute.
978 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
980 struct nfs_inode *nfsi = NFS_I(inode);
981 loff_t cur_size, new_isize;
982 unsigned long invalid = 0;
985 if (nfs_have_delegated_attributes(inode))
987 /* Has the inode gone and changed behind our back? */
988 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
990 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
993 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
994 inode->i_version != fattr->change_attr)
995 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
997 /* Verify a few of the more important attributes */
998 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
999 invalid |= NFS_INO_INVALID_ATTR;
1001 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1002 cur_size = i_size_read(inode);
1003 new_isize = nfs_size_to_loff_t(fattr->size);
1004 if (cur_size != new_isize && nfsi->npages == 0)
1005 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1008 /* Have any file permissions changed? */
1009 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1010 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1011 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1012 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1013 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1014 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1016 /* Has the link count changed? */
1017 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1018 invalid |= NFS_INO_INVALID_ATTR;
1020 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1021 invalid |= NFS_INO_INVALID_ATIME;
1024 nfsi->cache_validity |= invalid;
1026 nfsi->read_cache_jiffies = fattr->time_start;
1030 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1032 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1034 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1037 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1039 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1041 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1044 static atomic_long_t nfs_attr_generation_counter;
1046 static unsigned long nfs_read_attr_generation_counter(void)
1048 return atomic_long_read(&nfs_attr_generation_counter);
1051 unsigned long nfs_inc_attr_generation_counter(void)
1053 return atomic_long_inc_return(&nfs_attr_generation_counter);
1056 void nfs_fattr_init(struct nfs_fattr *fattr)
1059 fattr->time_start = jiffies;
1060 fattr->gencount = nfs_inc_attr_generation_counter();
1061 fattr->owner_name = NULL;
1062 fattr->group_name = NULL;
1064 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1066 struct nfs_fattr *nfs_alloc_fattr(void)
1068 struct nfs_fattr *fattr;
1070 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1072 nfs_fattr_init(fattr);
1075 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1077 struct nfs_fh *nfs_alloc_fhandle(void)
1081 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1086 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1090 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1091 * in the same way that wireshark does
1095 * For debugging only.
1097 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1099 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1100 * not on the result */
1101 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1105 * _nfs_display_fhandle - display an NFS file handle on the console
1107 * @fh: file handle to display
1108 * @caption: display caption
1110 * For debugging only.
1112 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1116 if (fh == NULL || fh->size == 0) {
1117 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1121 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1122 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1123 for (i = 0; i < fh->size; i += 16) {
1124 __be32 *pos = (__be32 *)&fh->data[i];
1126 switch ((fh->size - i - 1) >> 2) {
1128 printk(KERN_DEFAULT " %08x\n",
1132 printk(KERN_DEFAULT " %08x %08x\n",
1133 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1136 printk(KERN_DEFAULT " %08x %08x %08x\n",
1137 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1138 be32_to_cpup(pos + 2));
1141 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1142 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1143 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1150 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1151 * @inode - pointer to inode
1152 * @fattr - attributes
1154 * Attempt to divine whether or not an RPC call reply carrying stale
1155 * attributes got scheduled after another call carrying updated ones.
1157 * To do so, the function first assumes that a more recent ctime means
1158 * that the attributes in fattr are newer, however it also attempt to
1159 * catch the case where ctime either didn't change, or went backwards
1160 * (if someone reset the clock on the server) by looking at whether
1161 * or not this RPC call was started after the inode was last updated.
1162 * Note also the check for wraparound of 'attr_gencount'
1164 * The function returns 'true' if it thinks the attributes in 'fattr' are
1165 * more recent than the ones cached in the inode.
1168 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1170 const struct nfs_inode *nfsi = NFS_I(inode);
1172 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1173 nfs_ctime_need_update(inode, fattr) ||
1174 nfs_size_need_update(inode, fattr) ||
1175 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1178 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1180 if (nfs_inode_attrs_need_update(inode, fattr))
1181 return nfs_update_inode(inode, fattr);
1182 return nfs_check_inode_attributes(inode, fattr);
1186 * nfs_refresh_inode - try to update the inode attribute cache
1187 * @inode - pointer to inode
1188 * @fattr - updated attributes
1190 * Check that an RPC call that returned attributes has not overlapped with
1191 * other recent updates of the inode metadata, then decide whether it is
1192 * safe to do a full update of the inode attributes, or whether just to
1193 * call nfs_check_inode_attributes.
1195 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1199 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1201 spin_lock(&inode->i_lock);
1202 status = nfs_refresh_inode_locked(inode, fattr);
1203 spin_unlock(&inode->i_lock);
1207 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1209 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1211 struct nfs_inode *nfsi = NFS_I(inode);
1213 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1214 if (S_ISDIR(inode->i_mode)) {
1215 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1216 nfs_fscache_invalidate(inode);
1218 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1220 return nfs_refresh_inode_locked(inode, fattr);
1224 * nfs_post_op_update_inode - try to update the inode attribute cache
1225 * @inode - pointer to inode
1226 * @fattr - updated attributes
1228 * After an operation that has changed the inode metadata, mark the
1229 * attribute cache as being invalid, then try to update it.
1231 * NB: if the server didn't return any post op attributes, this
1232 * function will force the retrieval of attributes before the next
1233 * NFS request. Thus it should be used only for operations that
1234 * are expected to change one or more attributes, to avoid
1235 * unnecessary NFS requests and trips through nfs_update_inode().
1237 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1241 spin_lock(&inode->i_lock);
1242 status = nfs_post_op_update_inode_locked(inode, fattr);
1243 spin_unlock(&inode->i_lock);
1246 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1249 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1250 * @inode - pointer to inode
1251 * @fattr - updated attributes
1253 * After an operation that has changed the inode metadata, mark the
1254 * attribute cache as being invalid, then try to update it. Fake up
1255 * weak cache consistency data, if none exist.
1257 * This function is mainly designed to be used by the ->write_done() functions.
1259 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1263 spin_lock(&inode->i_lock);
1264 /* Don't do a WCC update if these attributes are already stale */
1265 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1266 !nfs_inode_attrs_need_update(inode, fattr)) {
1267 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1268 | NFS_ATTR_FATTR_PRESIZE
1269 | NFS_ATTR_FATTR_PREMTIME
1270 | NFS_ATTR_FATTR_PRECTIME);
1273 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1274 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1275 fattr->pre_change_attr = inode->i_version;
1276 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1278 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1279 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1280 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1281 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1283 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1284 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1285 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1286 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1288 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1289 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1290 fattr->pre_size = i_size_read(inode);
1291 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1294 status = nfs_post_op_update_inode_locked(inode, fattr);
1295 spin_unlock(&inode->i_lock);
1298 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1301 * Many nfs protocol calls return the new file attributes after
1302 * an operation. Here we update the inode to reflect the state
1303 * of the server's inode.
1305 * This is a bit tricky because we have to make sure all dirty pages
1306 * have been sent off to the server before calling invalidate_inode_pages.
1307 * To make sure no other process adds more write requests while we try
1308 * our best to flush them, we make them sleep during the attribute refresh.
1310 * A very similar scenario holds for the dir cache.
1312 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1314 struct nfs_server *server;
1315 struct nfs_inode *nfsi = NFS_I(inode);
1316 loff_t cur_isize, new_isize;
1317 unsigned long invalid = 0;
1318 unsigned long now = jiffies;
1319 unsigned long save_cache_validity;
1321 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1322 __func__, inode->i_sb->s_id, inode->i_ino,
1323 nfs_display_fhandle_hash(NFS_FH(inode)),
1324 atomic_read(&inode->i_count), fattr->valid);
1326 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1327 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1328 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1329 NFS_SERVER(inode)->nfs_client->cl_hostname,
1330 inode->i_sb->s_id, (long long)nfsi->fileid,
1331 (long long)fattr->fileid);
1336 * Make sure the inode's type hasn't changed.
1338 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1340 * Big trouble! The inode has become a different object.
1342 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1343 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1347 server = NFS_SERVER(inode);
1348 /* Update the fsid? */
1349 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1350 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1351 !IS_AUTOMOUNT(inode))
1352 server->fsid = fattr->fsid;
1355 * Update the read time so we don't revalidate too often.
1357 nfsi->read_cache_jiffies = fattr->time_start;
1359 save_cache_validity = nfsi->cache_validity;
1360 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1361 | NFS_INO_INVALID_ATIME
1362 | NFS_INO_REVAL_FORCED
1363 | NFS_INO_REVAL_PAGECACHE);
1365 /* Do atomic weak cache consistency updates */
1366 invalid |= nfs_wcc_update_inode(inode, fattr);
1368 /* More cache consistency checks */
1369 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1370 if (inode->i_version != fattr->change_attr) {
1371 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1372 inode->i_sb->s_id, inode->i_ino);
1373 invalid |= NFS_INO_INVALID_ATTR
1374 | NFS_INO_INVALID_DATA
1375 | NFS_INO_INVALID_ACCESS
1376 | NFS_INO_INVALID_ACL
1377 | NFS_INO_REVAL_PAGECACHE;
1378 if (S_ISDIR(inode->i_mode))
1379 nfs_force_lookup_revalidate(inode);
1380 inode->i_version = fattr->change_attr;
1382 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1383 invalid |= save_cache_validity;
1385 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1386 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1387 } else if (server->caps & NFS_CAP_MTIME)
1388 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1389 | NFS_INO_REVAL_FORCED);
1391 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1392 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1393 } else if (server->caps & NFS_CAP_CTIME)
1394 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1395 | NFS_INO_REVAL_FORCED);
1397 /* Check if our cached file size is stale */
1398 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1399 new_isize = nfs_size_to_loff_t(fattr->size);
1400 cur_isize = i_size_read(inode);
1401 if (new_isize != cur_isize) {
1402 /* Do we perhaps have any outstanding writes, or has
1403 * the file grown beyond our last write? */
1404 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1405 new_isize > cur_isize) {
1406 i_size_write(inode, new_isize);
1407 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1409 dprintk("NFS: isize change on server for file %s/%ld "
1413 (long long)cur_isize,
1414 (long long)new_isize);
1417 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1418 | NFS_INO_REVAL_PAGECACHE
1419 | NFS_INO_REVAL_FORCED);
1422 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1423 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1424 else if (server->caps & NFS_CAP_ATIME)
1425 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1426 | NFS_INO_REVAL_FORCED);
1428 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1429 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1430 umode_t newmode = inode->i_mode & S_IFMT;
1431 newmode |= fattr->mode & S_IALLUGO;
1432 inode->i_mode = newmode;
1433 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1435 } else if (server->caps & NFS_CAP_MODE)
1436 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1437 | NFS_INO_INVALID_ACCESS
1438 | NFS_INO_INVALID_ACL
1439 | NFS_INO_REVAL_FORCED);
1441 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1442 if (!uid_eq(inode->i_uid, fattr->uid)) {
1443 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1444 inode->i_uid = fattr->uid;
1446 } else if (server->caps & NFS_CAP_OWNER)
1447 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1448 | NFS_INO_INVALID_ACCESS
1449 | NFS_INO_INVALID_ACL
1450 | NFS_INO_REVAL_FORCED);
1452 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1453 if (!gid_eq(inode->i_gid, fattr->gid)) {
1454 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1455 inode->i_gid = fattr->gid;
1457 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1458 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1459 | NFS_INO_INVALID_ACCESS
1460 | NFS_INO_INVALID_ACL
1461 | NFS_INO_REVAL_FORCED);
1463 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1464 if (inode->i_nlink != fattr->nlink) {
1465 invalid |= NFS_INO_INVALID_ATTR;
1466 if (S_ISDIR(inode->i_mode))
1467 invalid |= NFS_INO_INVALID_DATA;
1468 set_nlink(inode, fattr->nlink);
1470 } else if (server->caps & NFS_CAP_NLINK)
1471 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1472 | NFS_INO_REVAL_FORCED);
1474 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1476 * report the blocks in 512byte units
1478 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1480 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1481 inode->i_blocks = fattr->du.nfs2.blocks;
1483 /* Update attrtimeo value if we're out of the unstable period */
1484 if (invalid & NFS_INO_INVALID_ATTR) {
1485 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1486 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1487 nfsi->attrtimeo_timestamp = now;
1488 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1490 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1491 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1492 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1493 nfsi->attrtimeo_timestamp = now;
1496 invalid &= ~NFS_INO_INVALID_ATTR;
1497 /* Don't invalidate the data if we were to blame */
1498 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1499 || S_ISLNK(inode->i_mode)))
1500 invalid &= ~NFS_INO_INVALID_DATA;
1501 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1502 (save_cache_validity & NFS_INO_REVAL_FORCED))
1503 nfsi->cache_validity |= invalid;
1505 if (invalid & NFS_INO_INVALID_DATA)
1506 nfs_fscache_invalidate(inode);
1511 * No need to worry about unhashing the dentry, as the
1512 * lookup validation will know that the inode is bad.
1513 * (But we fall through to invalidate the caches.)
1515 nfs_invalidate_inode(inode);
1519 struct inode *nfs_alloc_inode(struct super_block *sb)
1521 struct nfs_inode *nfsi;
1522 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1526 nfsi->cache_validity = 0UL;
1527 #ifdef CONFIG_NFS_V3_ACL
1528 nfsi->acl_access = ERR_PTR(-EAGAIN);
1529 nfsi->acl_default = ERR_PTR(-EAGAIN);
1531 #if IS_ENABLED(CONFIG_NFS_V4)
1532 nfsi->nfs4_acl = NULL;
1533 #endif /* CONFIG_NFS_V4 */
1534 return &nfsi->vfs_inode;
1536 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1538 static void nfs_i_callback(struct rcu_head *head)
1540 struct inode *inode = container_of(head, struct inode, i_rcu);
1541 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1544 void nfs_destroy_inode(struct inode *inode)
1546 call_rcu(&inode->i_rcu, nfs_i_callback);
1548 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1550 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1552 #if IS_ENABLED(CONFIG_NFS_V4)
1553 INIT_LIST_HEAD(&nfsi->open_states);
1554 nfsi->delegation = NULL;
1555 nfsi->delegation_state = 0;
1556 init_rwsem(&nfsi->rwsem);
1557 nfsi->layout = NULL;
1561 static void init_once(void *foo)
1563 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1565 inode_init_once(&nfsi->vfs_inode);
1566 INIT_LIST_HEAD(&nfsi->open_files);
1567 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1568 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1569 INIT_LIST_HEAD(&nfsi->commit_info.list);
1571 nfsi->commit_info.ncommit = 0;
1572 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1573 atomic_set(&nfsi->silly_count, 1);
1574 INIT_HLIST_HEAD(&nfsi->silly_list);
1575 init_waitqueue_head(&nfsi->waitqueue);
1576 nfs4_init_once(nfsi);
1579 static int __init nfs_init_inodecache(void)
1581 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1582 sizeof(struct nfs_inode),
1583 0, (SLAB_RECLAIM_ACCOUNT|
1586 if (nfs_inode_cachep == NULL)
1592 static void nfs_destroy_inodecache(void)
1595 * Make sure all delayed rcu free inodes are flushed before we
1599 kmem_cache_destroy(nfs_inode_cachep);
1602 struct workqueue_struct *nfsiod_workqueue;
1603 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1606 * start up the nfsiod workqueue
1608 static int nfsiod_start(void)
1610 struct workqueue_struct *wq;
1611 dprintk("RPC: creating workqueue nfsiod\n");
1612 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1615 nfsiod_workqueue = wq;
1620 * Destroy the nfsiod workqueue
1622 static void nfsiod_stop(void)
1624 struct workqueue_struct *wq;
1626 wq = nfsiod_workqueue;
1629 nfsiod_workqueue = NULL;
1630 destroy_workqueue(wq);
1634 EXPORT_SYMBOL_GPL(nfs_net_id);
1636 static int nfs_net_init(struct net *net)
1638 nfs_clients_init(net);
1639 return nfs_dns_resolver_cache_init(net);
1642 static void nfs_net_exit(struct net *net)
1644 nfs_dns_resolver_cache_destroy(net);
1645 nfs_cleanup_cb_ident_idr(net);
1648 static struct pernet_operations nfs_net_ops = {
1649 .init = nfs_net_init,
1650 .exit = nfs_net_exit,
1652 .size = sizeof(struct nfs_net),
1658 static int __init init_nfs_fs(void)
1662 err = nfs_dns_resolver_init();
1666 err = register_pernet_subsys(&nfs_net_ops);
1670 err = nfs_fscache_register();
1674 err = nfsiod_start();
1678 err = nfs_fs_proc_init();
1682 err = nfs_init_nfspagecache();
1686 err = nfs_init_inodecache();
1690 err = nfs_init_readpagecache();
1694 err = nfs_init_writepagecache();
1698 err = nfs_init_directcache();
1702 #ifdef CONFIG_PROC_FS
1703 rpc_proc_register(&init_net, &nfs_rpcstat);
1705 if ((err = register_nfs_fs()) != 0)
1710 #ifdef CONFIG_PROC_FS
1711 rpc_proc_unregister(&init_net, "nfs");
1713 nfs_destroy_directcache();
1715 nfs_destroy_writepagecache();
1717 nfs_destroy_readpagecache();
1719 nfs_destroy_inodecache();
1721 nfs_destroy_nfspagecache();
1727 nfs_fscache_unregister();
1729 unregister_pernet_subsys(&nfs_net_ops);
1731 nfs_dns_resolver_destroy();
1736 static void __exit exit_nfs_fs(void)
1738 nfs_destroy_directcache();
1739 nfs_destroy_writepagecache();
1740 nfs_destroy_readpagecache();
1741 nfs_destroy_inodecache();
1742 nfs_destroy_nfspagecache();
1743 nfs_fscache_unregister();
1744 unregister_pernet_subsys(&nfs_net_ops);
1745 nfs_dns_resolver_destroy();
1746 #ifdef CONFIG_PROC_FS
1747 rpc_proc_unregister(&init_net, "nfs");
1749 unregister_nfs_fs();
1754 /* Not quite true; I just maintain it */
1756 MODULE_LICENSE("GPL");
1757 module_param(enable_ino64, bool, 0644);
1759 module_init(init_nfs_fs)
1760 module_exit(exit_nfs_fs)