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 (nfs_compare_fh(NFS_FH(inode), fh))
242 if (is_bad_inode(inode) || NFS_STALE(inode))
248 nfs_init_locked(struct inode *inode, void *opaque)
250 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
251 struct nfs_fattr *fattr = desc->fattr;
253 set_nfs_fileid(inode, fattr->fileid);
254 nfs_copy_fh(NFS_FH(inode), desc->fh);
259 * This is our front-end to iget that looks up inodes by file handle
260 * instead of inode number.
263 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
265 struct nfs_find_desc desc = {
269 struct inode *inode = ERR_PTR(-ENOENT);
272 nfs_attr_check_mountpoint(sb, fattr);
274 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
275 !nfs_attr_use_mounted_on_fileid(fattr))
277 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
280 hash = nfs_fattr_to_ino_t(fattr);
282 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
284 inode = ERR_PTR(-ENOMEM);
288 if (inode->i_state & I_NEW) {
289 struct nfs_inode *nfsi = NFS_I(inode);
290 unsigned long now = jiffies;
292 /* We set i_ino for the few things that still rely on it,
296 /* We can't support update_atime(), since the server will reset it */
297 inode->i_flags |= S_NOATIME|S_NOCMTIME;
298 inode->i_mode = fattr->mode;
299 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
300 && nfs_server_capable(inode, NFS_CAP_MODE))
301 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
302 /* Why so? Because we want revalidate for devices/FIFOs, and
303 * that's precisely what we have in nfs_file_inode_operations.
305 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
306 if (S_ISREG(inode->i_mode)) {
307 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
308 inode->i_data.a_ops = &nfs_file_aops;
309 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
310 } else if (S_ISDIR(inode->i_mode)) {
311 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
312 inode->i_fop = &nfs_dir_operations;
313 inode->i_data.a_ops = &nfs_dir_aops;
314 /* Deal with crossing mountpoints */
315 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
316 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
317 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
318 inode->i_op = &nfs_referral_inode_operations;
320 inode->i_op = &nfs_mountpoint_inode_operations;
322 inode->i_flags |= S_AUTOMOUNT;
324 } else if (S_ISLNK(inode->i_mode))
325 inode->i_op = &nfs_symlink_inode_operations;
327 init_special_inode(inode, inode->i_mode, fattr->rdev);
329 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
330 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
331 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
332 inode->i_version = 0;
338 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
342 nfsi->read_cache_jiffies = fattr->time_start;
343 nfsi->attr_gencount = fattr->gencount;
344 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
345 inode->i_atime = fattr->atime;
346 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
347 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
348 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
349 inode->i_mtime = fattr->mtime;
350 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
351 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
352 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
353 inode->i_ctime = fattr->ctime;
354 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
355 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
356 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
357 inode->i_version = fattr->change_attr;
358 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
359 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
360 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
361 inode->i_size = nfs_size_to_loff_t(fattr->size);
363 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
364 | NFS_INO_REVAL_PAGECACHE;
365 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
366 set_nlink(inode, fattr->nlink);
367 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
368 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
369 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
370 inode->i_uid = fattr->uid;
371 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
372 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
373 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
374 inode->i_gid = fattr->gid;
375 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
376 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
377 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
378 inode->i_blocks = fattr->du.nfs2.blocks;
379 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
381 * report the blocks in 512byte units
383 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
385 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
386 nfsi->attrtimeo_timestamp = now;
387 nfsi->access_cache = RB_ROOT;
389 nfs_fscache_init_inode_cookie(inode);
391 unlock_new_inode(inode);
393 nfs_refresh_inode(inode, fattr);
394 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
396 (long long)NFS_FILEID(inode),
397 nfs_display_fhandle_hash(fh),
398 atomic_read(&inode->i_count));
404 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
407 EXPORT_SYMBOL_GPL(nfs_fhget);
409 #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)
412 nfs_setattr(struct dentry *dentry, struct iattr *attr)
414 struct inode *inode = dentry->d_inode;
415 struct nfs_fattr *fattr;
418 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
420 /* skip mode change if it's just for clearing setuid/setgid */
421 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
422 attr->ia_valid &= ~ATTR_MODE;
424 if (attr->ia_valid & ATTR_SIZE) {
425 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
426 attr->ia_valid &= ~ATTR_SIZE;
429 /* Optimization: if the end result is no change, don't RPC */
430 attr->ia_valid &= NFS_VALID_ATTRS;
431 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
434 /* Write all dirty data */
435 if (S_ISREG(inode->i_mode)) {
436 nfs_inode_dio_wait(inode);
440 fattr = nfs_alloc_fattr();
444 * Return any delegations if we're going to change ACLs
446 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
447 NFS_PROTO(inode)->return_delegation(inode);
448 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
450 nfs_refresh_inode(inode, fattr);
451 nfs_free_fattr(fattr);
455 EXPORT_SYMBOL_GPL(nfs_setattr);
458 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
459 * @inode: inode of the file used
460 * @offset: file offset to start truncating
462 * This is a copy of the common vmtruncate, but with the locking
463 * corrected to take into account the fact that NFS requires
464 * inode->i_size to be updated under the inode->i_lock.
466 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
471 err = inode_newsize_ok(inode, offset);
475 spin_lock(&inode->i_lock);
476 oldsize = inode->i_size;
477 i_size_write(inode, offset);
478 spin_unlock(&inode->i_lock);
480 truncate_pagecache(inode, oldsize, offset);
486 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
487 * @inode: pointer to struct inode
488 * @attr: pointer to struct iattr
490 * Note: we do this in the *proc.c in order to ensure that
491 * it works for things like exclusive creates too.
493 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
495 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
496 spin_lock(&inode->i_lock);
497 if ((attr->ia_valid & ATTR_MODE) != 0) {
498 int mode = attr->ia_mode & S_IALLUGO;
499 mode |= inode->i_mode & ~S_IALLUGO;
500 inode->i_mode = mode;
502 if ((attr->ia_valid & ATTR_UID) != 0)
503 inode->i_uid = attr->ia_uid;
504 if ((attr->ia_valid & ATTR_GID) != 0)
505 inode->i_gid = attr->ia_gid;
506 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
507 spin_unlock(&inode->i_lock);
509 if ((attr->ia_valid & ATTR_SIZE) != 0) {
510 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
511 nfs_vmtruncate(inode, attr->ia_size);
514 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
516 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
518 struct inode *inode = dentry->d_inode;
519 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
522 /* Flush out writes to the server in order to update c/mtime. */
523 if (S_ISREG(inode->i_mode)) {
524 nfs_inode_dio_wait(inode);
525 err = filemap_write_and_wait(inode->i_mapping);
531 * We may force a getattr if the user cares about atime.
533 * Note that we only have to check the vfsmount flags here:
534 * - NFS always sets S_NOATIME by so checking it would give a
536 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
537 * no point in checking those.
539 if ((mnt->mnt_flags & MNT_NOATIME) ||
540 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
544 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
546 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
548 generic_fillattr(inode, stat);
549 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
554 EXPORT_SYMBOL_GPL(nfs_getattr);
556 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
558 atomic_set(&l_ctx->count, 1);
559 l_ctx->lockowner.l_owner = current->files;
560 l_ctx->lockowner.l_pid = current->tgid;
561 INIT_LIST_HEAD(&l_ctx->list);
564 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
566 struct nfs_lock_context *pos;
568 list_for_each_entry(pos, &ctx->lock_context.list, list) {
569 if (pos->lockowner.l_owner != current->files)
571 if (pos->lockowner.l_pid != current->tgid)
573 atomic_inc(&pos->count);
579 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
581 struct nfs_lock_context *res, *new = NULL;
582 struct inode *inode = ctx->dentry->d_inode;
584 spin_lock(&inode->i_lock);
585 res = __nfs_find_lock_context(ctx);
587 spin_unlock(&inode->i_lock);
588 new = kmalloc(sizeof(*new), GFP_KERNEL);
590 return ERR_PTR(-ENOMEM);
591 nfs_init_lock_context(new);
592 spin_lock(&inode->i_lock);
593 res = __nfs_find_lock_context(ctx);
595 list_add_tail(&new->list, &ctx->lock_context.list);
596 new->open_context = ctx;
601 spin_unlock(&inode->i_lock);
606 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
608 struct nfs_open_context *ctx = l_ctx->open_context;
609 struct inode *inode = ctx->dentry->d_inode;
611 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
613 list_del(&l_ctx->list);
614 spin_unlock(&inode->i_lock);
619 * nfs_close_context - Common close_context() routine NFSv2/v3
620 * @ctx: pointer to context
621 * @is_sync: is this a synchronous close
623 * always ensure that the attributes are up to date if we're mounted
624 * with close-to-open semantics
626 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
629 struct nfs_server *server;
631 if (!(ctx->mode & FMODE_WRITE))
635 inode = ctx->dentry->d_inode;
636 if (!list_empty(&NFS_I(inode)->open_files))
638 server = NFS_SERVER(inode);
639 if (server->flags & NFS_MOUNT_NOCTO)
641 nfs_revalidate_inode(server, inode);
643 EXPORT_SYMBOL_GPL(nfs_close_context);
645 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
647 struct nfs_open_context *ctx;
648 struct rpc_cred *cred = rpc_lookup_cred();
650 return ERR_CAST(cred);
652 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
655 return ERR_PTR(-ENOMEM);
657 nfs_sb_active(dentry->d_sb);
658 ctx->dentry = dget(dentry);
664 nfs_init_lock_context(&ctx->lock_context);
665 ctx->lock_context.open_context = ctx;
666 INIT_LIST_HEAD(&ctx->list);
667 ctx->mdsthreshold = NULL;
670 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
672 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
675 atomic_inc(&ctx->lock_context.count);
678 EXPORT_SYMBOL_GPL(get_nfs_open_context);
680 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
682 struct inode *inode = ctx->dentry->d_inode;
683 struct super_block *sb = ctx->dentry->d_sb;
685 if (!list_empty(&ctx->list)) {
686 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
688 list_del(&ctx->list);
689 spin_unlock(&inode->i_lock);
690 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
693 NFS_PROTO(inode)->close_context(ctx, is_sync);
694 if (ctx->cred != NULL)
695 put_rpccred(ctx->cred);
698 kfree(ctx->mdsthreshold);
702 void put_nfs_open_context(struct nfs_open_context *ctx)
704 __put_nfs_open_context(ctx, 0);
706 EXPORT_SYMBOL_GPL(put_nfs_open_context);
709 * Ensure that mmap has a recent RPC credential for use when writing out
712 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
714 struct inode *inode = filp->f_path.dentry->d_inode;
715 struct nfs_inode *nfsi = NFS_I(inode);
717 filp->private_data = get_nfs_open_context(ctx);
718 spin_lock(&inode->i_lock);
719 list_add(&ctx->list, &nfsi->open_files);
720 spin_unlock(&inode->i_lock);
722 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
725 * Given an inode, search for an open context with the desired characteristics
727 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
729 struct nfs_inode *nfsi = NFS_I(inode);
730 struct nfs_open_context *pos, *ctx = NULL;
732 spin_lock(&inode->i_lock);
733 list_for_each_entry(pos, &nfsi->open_files, list) {
734 if (cred != NULL && pos->cred != cred)
736 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
738 ctx = get_nfs_open_context(pos);
741 spin_unlock(&inode->i_lock);
745 static void nfs_file_clear_open_context(struct file *filp)
747 struct inode *inode = filp->f_path.dentry->d_inode;
748 struct nfs_open_context *ctx = nfs_file_open_context(filp);
751 filp->private_data = NULL;
752 spin_lock(&inode->i_lock);
753 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
754 spin_unlock(&inode->i_lock);
755 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
760 * These allocate and release file read/write context information.
762 int nfs_open(struct inode *inode, struct file *filp)
764 struct nfs_open_context *ctx;
766 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
769 nfs_file_set_open_context(filp, ctx);
770 put_nfs_open_context(ctx);
771 nfs_fscache_set_inode_cookie(inode, filp);
775 int nfs_release(struct inode *inode, struct file *filp)
777 nfs_file_clear_open_context(filp);
782 * This function is called whenever some part of NFS notices that
783 * the cached attributes have to be refreshed.
786 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
788 int status = -ESTALE;
789 struct nfs_fattr *fattr = NULL;
790 struct nfs_inode *nfsi = NFS_I(inode);
792 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
793 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
795 if (is_bad_inode(inode))
797 if (NFS_STALE(inode))
801 fattr = nfs_alloc_fattr();
805 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
806 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
808 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
810 (long long)NFS_FILEID(inode), status);
811 if (status == -ESTALE) {
812 nfs_zap_caches(inode);
813 if (!S_ISDIR(inode->i_mode))
814 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
819 status = nfs_refresh_inode(inode, fattr);
821 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
823 (long long)NFS_FILEID(inode), status);
827 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
828 nfs_zap_acl_cache(inode);
830 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
832 (long long)NFS_FILEID(inode));
835 nfs_free_fattr(fattr);
839 int nfs_attribute_timeout(struct inode *inode)
841 struct nfs_inode *nfsi = NFS_I(inode);
843 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
846 static int nfs_attribute_cache_expired(struct inode *inode)
848 if (nfs_have_delegated_attributes(inode))
850 return nfs_attribute_timeout(inode);
854 * nfs_revalidate_inode - Revalidate the inode attributes
855 * @server - pointer to nfs_server struct
856 * @inode - pointer to inode struct
858 * Updates inode attribute information by retrieving the data from the server.
860 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
862 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
863 && !nfs_attribute_cache_expired(inode))
864 return NFS_STALE(inode) ? -ESTALE : 0;
865 return __nfs_revalidate_inode(server, inode);
867 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
869 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
871 struct nfs_inode *nfsi = NFS_I(inode);
873 if (mapping->nrpages != 0) {
874 int ret = invalidate_inode_pages2(mapping);
878 spin_lock(&inode->i_lock);
879 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
880 if (S_ISDIR(inode->i_mode))
881 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
882 spin_unlock(&inode->i_lock);
883 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
884 nfs_fscache_wait_on_invalidate(inode);
885 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
886 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
890 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
892 if (nfs_have_delegated_attributes(inode))
894 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
895 || nfs_attribute_timeout(inode)
900 * nfs_revalidate_mapping - Revalidate the pagecache
901 * @inode - pointer to host inode
902 * @mapping - pointer to mapping
904 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
906 struct nfs_inode *nfsi = NFS_I(inode);
909 /* swapfiles are not supposed to be shared. */
910 if (IS_SWAPFILE(inode))
913 if (nfs_mapping_need_revalidate_inode(inode)) {
914 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
918 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
919 ret = nfs_invalidate_mapping(inode, mapping);
924 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
926 struct nfs_inode *nfsi = NFS_I(inode);
927 unsigned long ret = 0;
929 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
930 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
931 && inode->i_version == fattr->pre_change_attr) {
932 inode->i_version = fattr->change_attr;
933 if (S_ISDIR(inode->i_mode))
934 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
935 ret |= NFS_INO_INVALID_ATTR;
937 /* If we have atomic WCC data, we may update some attributes */
938 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
939 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
940 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
941 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
942 ret |= NFS_INO_INVALID_ATTR;
945 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
946 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
947 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
948 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
949 if (S_ISDIR(inode->i_mode))
950 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
951 ret |= NFS_INO_INVALID_ATTR;
953 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
954 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
955 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
956 && nfsi->npages == 0) {
957 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
958 ret |= NFS_INO_INVALID_ATTR;
961 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
962 nfs_fscache_invalidate(inode);
968 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
969 * @inode - pointer to inode
970 * @fattr - updated attributes
972 * Verifies the attribute cache. If we have just changed the attributes,
973 * so that fattr carries weak cache consistency data, then it may
974 * also update the ctime/mtime/change_attribute.
976 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
978 struct nfs_inode *nfsi = NFS_I(inode);
979 loff_t cur_size, new_isize;
980 unsigned long invalid = 0;
983 if (nfs_have_delegated_attributes(inode))
985 /* Has the inode gone and changed behind our back? */
986 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
988 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
991 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
992 inode->i_version != fattr->change_attr)
993 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
995 /* Verify a few of the more important attributes */
996 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
997 invalid |= NFS_INO_INVALID_ATTR;
999 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1000 cur_size = i_size_read(inode);
1001 new_isize = nfs_size_to_loff_t(fattr->size);
1002 if (cur_size != new_isize && nfsi->npages == 0)
1003 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1006 /* Have any file permissions changed? */
1007 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1008 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1009 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
1010 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1011 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
1012 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1014 /* Has the link count changed? */
1015 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1016 invalid |= NFS_INO_INVALID_ATTR;
1018 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1019 invalid |= NFS_INO_INVALID_ATIME;
1022 nfsi->cache_validity |= invalid;
1024 nfsi->read_cache_jiffies = fattr->time_start;
1028 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1030 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1032 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1035 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1037 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1039 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1042 static atomic_long_t nfs_attr_generation_counter;
1044 static unsigned long nfs_read_attr_generation_counter(void)
1046 return atomic_long_read(&nfs_attr_generation_counter);
1049 unsigned long nfs_inc_attr_generation_counter(void)
1051 return atomic_long_inc_return(&nfs_attr_generation_counter);
1054 void nfs_fattr_init(struct nfs_fattr *fattr)
1057 fattr->time_start = jiffies;
1058 fattr->gencount = nfs_inc_attr_generation_counter();
1059 fattr->owner_name = NULL;
1060 fattr->group_name = NULL;
1062 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1064 struct nfs_fattr *nfs_alloc_fattr(void)
1066 struct nfs_fattr *fattr;
1068 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1070 nfs_fattr_init(fattr);
1073 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1075 struct nfs_fh *nfs_alloc_fhandle(void)
1079 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1084 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1088 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1089 * in the same way that wireshark does
1093 * For debugging only.
1095 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1097 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1098 * not on the result */
1099 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1103 * _nfs_display_fhandle - display an NFS file handle on the console
1105 * @fh: file handle to display
1106 * @caption: display caption
1108 * For debugging only.
1110 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1114 if (fh == NULL || fh->size == 0) {
1115 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1119 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1120 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1121 for (i = 0; i < fh->size; i += 16) {
1122 __be32 *pos = (__be32 *)&fh->data[i];
1124 switch ((fh->size - i - 1) >> 2) {
1126 printk(KERN_DEFAULT " %08x\n",
1130 printk(KERN_DEFAULT " %08x %08x\n",
1131 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1134 printk(KERN_DEFAULT " %08x %08x %08x\n",
1135 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1136 be32_to_cpup(pos + 2));
1139 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1140 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1141 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1148 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1149 * @inode - pointer to inode
1150 * @fattr - attributes
1152 * Attempt to divine whether or not an RPC call reply carrying stale
1153 * attributes got scheduled after another call carrying updated ones.
1155 * To do so, the function first assumes that a more recent ctime means
1156 * that the attributes in fattr are newer, however it also attempt to
1157 * catch the case where ctime either didn't change, or went backwards
1158 * (if someone reset the clock on the server) by looking at whether
1159 * or not this RPC call was started after the inode was last updated.
1160 * Note also the check for wraparound of 'attr_gencount'
1162 * The function returns 'true' if it thinks the attributes in 'fattr' are
1163 * more recent than the ones cached in the inode.
1166 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1168 const struct nfs_inode *nfsi = NFS_I(inode);
1170 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1171 nfs_ctime_need_update(inode, fattr) ||
1172 nfs_size_need_update(inode, fattr) ||
1173 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1176 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1178 if (nfs_inode_attrs_need_update(inode, fattr))
1179 return nfs_update_inode(inode, fattr);
1180 return nfs_check_inode_attributes(inode, fattr);
1184 * nfs_refresh_inode - try to update the inode attribute cache
1185 * @inode - pointer to inode
1186 * @fattr - updated attributes
1188 * Check that an RPC call that returned attributes has not overlapped with
1189 * other recent updates of the inode metadata, then decide whether it is
1190 * safe to do a full update of the inode attributes, or whether just to
1191 * call nfs_check_inode_attributes.
1193 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1197 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1199 spin_lock(&inode->i_lock);
1200 status = nfs_refresh_inode_locked(inode, fattr);
1201 spin_unlock(&inode->i_lock);
1205 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1207 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1209 struct nfs_inode *nfsi = NFS_I(inode);
1211 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1212 if (S_ISDIR(inode->i_mode)) {
1213 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1214 nfs_fscache_invalidate(inode);
1216 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1218 return nfs_refresh_inode_locked(inode, fattr);
1222 * nfs_post_op_update_inode - try to update the inode attribute cache
1223 * @inode - pointer to inode
1224 * @fattr - updated attributes
1226 * After an operation that has changed the inode metadata, mark the
1227 * attribute cache as being invalid, then try to update it.
1229 * NB: if the server didn't return any post op attributes, this
1230 * function will force the retrieval of attributes before the next
1231 * NFS request. Thus it should be used only for operations that
1232 * are expected to change one or more attributes, to avoid
1233 * unnecessary NFS requests and trips through nfs_update_inode().
1235 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1239 spin_lock(&inode->i_lock);
1240 status = nfs_post_op_update_inode_locked(inode, fattr);
1241 spin_unlock(&inode->i_lock);
1244 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1247 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1248 * @inode - pointer to inode
1249 * @fattr - updated attributes
1251 * After an operation that has changed the inode metadata, mark the
1252 * attribute cache as being invalid, then try to update it. Fake up
1253 * weak cache consistency data, if none exist.
1255 * This function is mainly designed to be used by the ->write_done() functions.
1257 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1261 spin_lock(&inode->i_lock);
1262 /* Don't do a WCC update if these attributes are already stale */
1263 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1264 !nfs_inode_attrs_need_update(inode, fattr)) {
1265 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1266 | NFS_ATTR_FATTR_PRESIZE
1267 | NFS_ATTR_FATTR_PREMTIME
1268 | NFS_ATTR_FATTR_PRECTIME);
1271 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1272 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1273 fattr->pre_change_attr = inode->i_version;
1274 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1276 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1277 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1278 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1279 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1281 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1282 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1283 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1284 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1286 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1287 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1288 fattr->pre_size = i_size_read(inode);
1289 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1292 status = nfs_post_op_update_inode_locked(inode, fattr);
1293 spin_unlock(&inode->i_lock);
1296 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1299 * Many nfs protocol calls return the new file attributes after
1300 * an operation. Here we update the inode to reflect the state
1301 * of the server's inode.
1303 * This is a bit tricky because we have to make sure all dirty pages
1304 * have been sent off to the server before calling invalidate_inode_pages.
1305 * To make sure no other process adds more write requests while we try
1306 * our best to flush them, we make them sleep during the attribute refresh.
1308 * A very similar scenario holds for the dir cache.
1310 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1312 struct nfs_server *server;
1313 struct nfs_inode *nfsi = NFS_I(inode);
1314 loff_t cur_isize, new_isize;
1315 unsigned long invalid = 0;
1316 unsigned long now = jiffies;
1317 unsigned long save_cache_validity;
1319 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1320 __func__, inode->i_sb->s_id, inode->i_ino,
1321 nfs_display_fhandle_hash(NFS_FH(inode)),
1322 atomic_read(&inode->i_count), fattr->valid);
1324 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1325 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1326 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1327 NFS_SERVER(inode)->nfs_client->cl_hostname,
1328 inode->i_sb->s_id, (long long)nfsi->fileid,
1329 (long long)fattr->fileid);
1334 * Make sure the inode's type hasn't changed.
1336 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1338 * Big trouble! The inode has become a different object.
1340 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1341 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1345 server = NFS_SERVER(inode);
1346 /* Update the fsid? */
1347 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1348 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1349 !IS_AUTOMOUNT(inode))
1350 server->fsid = fattr->fsid;
1353 * Update the read time so we don't revalidate too often.
1355 nfsi->read_cache_jiffies = fattr->time_start;
1357 save_cache_validity = nfsi->cache_validity;
1358 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1359 | NFS_INO_INVALID_ATIME
1360 | NFS_INO_REVAL_FORCED
1361 | NFS_INO_REVAL_PAGECACHE);
1363 /* Do atomic weak cache consistency updates */
1364 invalid |= nfs_wcc_update_inode(inode, fattr);
1366 /* More cache consistency checks */
1367 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1368 if (inode->i_version != fattr->change_attr) {
1369 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1370 inode->i_sb->s_id, inode->i_ino);
1371 invalid |= NFS_INO_INVALID_ATTR
1372 | NFS_INO_INVALID_DATA
1373 | NFS_INO_INVALID_ACCESS
1374 | NFS_INO_INVALID_ACL
1375 | NFS_INO_REVAL_PAGECACHE;
1376 if (S_ISDIR(inode->i_mode))
1377 nfs_force_lookup_revalidate(inode);
1378 inode->i_version = fattr->change_attr;
1380 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1381 invalid |= save_cache_validity;
1383 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1384 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1385 } else if (server->caps & NFS_CAP_MTIME)
1386 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1387 | NFS_INO_REVAL_FORCED);
1389 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1390 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1391 } else if (server->caps & NFS_CAP_CTIME)
1392 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1393 | NFS_INO_REVAL_FORCED);
1395 /* Check if our cached file size is stale */
1396 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1397 new_isize = nfs_size_to_loff_t(fattr->size);
1398 cur_isize = i_size_read(inode);
1399 if (new_isize != cur_isize) {
1400 /* Do we perhaps have any outstanding writes, or has
1401 * the file grown beyond our last write? */
1402 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1403 new_isize > cur_isize) {
1404 i_size_write(inode, new_isize);
1405 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1407 dprintk("NFS: isize change on server for file %s/%ld "
1411 (long long)cur_isize,
1412 (long long)new_isize);
1415 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1416 | NFS_INO_REVAL_PAGECACHE
1417 | NFS_INO_REVAL_FORCED);
1420 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1421 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1422 else if (server->caps & NFS_CAP_ATIME)
1423 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1424 | NFS_INO_REVAL_FORCED);
1426 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1427 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1428 umode_t newmode = inode->i_mode & S_IFMT;
1429 newmode |= fattr->mode & S_IALLUGO;
1430 inode->i_mode = newmode;
1431 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1433 } else if (server->caps & NFS_CAP_MODE)
1434 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1435 | NFS_INO_INVALID_ACCESS
1436 | NFS_INO_INVALID_ACL
1437 | NFS_INO_REVAL_FORCED);
1439 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1440 if (inode->i_uid != fattr->uid) {
1441 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1442 inode->i_uid = fattr->uid;
1444 } else if (server->caps & NFS_CAP_OWNER)
1445 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1446 | NFS_INO_INVALID_ACCESS
1447 | NFS_INO_INVALID_ACL
1448 | NFS_INO_REVAL_FORCED);
1450 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1451 if (inode->i_gid != fattr->gid) {
1452 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1453 inode->i_gid = fattr->gid;
1455 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1456 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1457 | NFS_INO_INVALID_ACCESS
1458 | NFS_INO_INVALID_ACL
1459 | NFS_INO_REVAL_FORCED);
1461 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1462 if (inode->i_nlink != fattr->nlink) {
1463 invalid |= NFS_INO_INVALID_ATTR;
1464 if (S_ISDIR(inode->i_mode))
1465 invalid |= NFS_INO_INVALID_DATA;
1466 set_nlink(inode, fattr->nlink);
1468 } else if (server->caps & NFS_CAP_NLINK)
1469 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1470 | NFS_INO_REVAL_FORCED);
1472 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1474 * report the blocks in 512byte units
1476 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1478 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1479 inode->i_blocks = fattr->du.nfs2.blocks;
1481 /* Update attrtimeo value if we're out of the unstable period */
1482 if (invalid & NFS_INO_INVALID_ATTR) {
1483 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1484 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1485 nfsi->attrtimeo_timestamp = now;
1486 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1488 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1489 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1490 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1491 nfsi->attrtimeo_timestamp = now;
1494 invalid &= ~NFS_INO_INVALID_ATTR;
1495 /* Don't invalidate the data if we were to blame */
1496 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1497 || S_ISLNK(inode->i_mode)))
1498 invalid &= ~NFS_INO_INVALID_DATA;
1499 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1500 (save_cache_validity & NFS_INO_REVAL_FORCED))
1501 nfsi->cache_validity |= invalid;
1503 if (invalid & NFS_INO_INVALID_DATA)
1504 nfs_fscache_invalidate(inode);
1509 * No need to worry about unhashing the dentry, as the
1510 * lookup validation will know that the inode is bad.
1511 * (But we fall through to invalidate the caches.)
1513 nfs_invalidate_inode(inode);
1517 struct inode *nfs_alloc_inode(struct super_block *sb)
1519 struct nfs_inode *nfsi;
1520 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1524 nfsi->cache_validity = 0UL;
1525 #ifdef CONFIG_NFS_V3_ACL
1526 nfsi->acl_access = ERR_PTR(-EAGAIN);
1527 nfsi->acl_default = ERR_PTR(-EAGAIN);
1529 #if IS_ENABLED(CONFIG_NFS_V4)
1530 nfsi->nfs4_acl = NULL;
1531 #endif /* CONFIG_NFS_V4 */
1532 return &nfsi->vfs_inode;
1534 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1536 static void nfs_i_callback(struct rcu_head *head)
1538 struct inode *inode = container_of(head, struct inode, i_rcu);
1539 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1542 void nfs_destroy_inode(struct inode *inode)
1544 call_rcu(&inode->i_rcu, nfs_i_callback);
1546 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1548 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1550 #if IS_ENABLED(CONFIG_NFS_V4)
1551 INIT_LIST_HEAD(&nfsi->open_states);
1552 nfsi->delegation = NULL;
1553 nfsi->delegation_state = 0;
1554 init_rwsem(&nfsi->rwsem);
1555 nfsi->layout = NULL;
1559 static void init_once(void *foo)
1561 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1563 inode_init_once(&nfsi->vfs_inode);
1564 INIT_LIST_HEAD(&nfsi->open_files);
1565 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1566 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1567 INIT_LIST_HEAD(&nfsi->commit_info.list);
1569 nfsi->commit_info.ncommit = 0;
1570 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1571 atomic_set(&nfsi->silly_count, 1);
1572 INIT_HLIST_HEAD(&nfsi->silly_list);
1573 init_waitqueue_head(&nfsi->waitqueue);
1574 nfs4_init_once(nfsi);
1577 static int __init nfs_init_inodecache(void)
1579 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1580 sizeof(struct nfs_inode),
1581 0, (SLAB_RECLAIM_ACCOUNT|
1584 if (nfs_inode_cachep == NULL)
1590 static void nfs_destroy_inodecache(void)
1593 * Make sure all delayed rcu free inodes are flushed before we
1597 kmem_cache_destroy(nfs_inode_cachep);
1600 struct workqueue_struct *nfsiod_workqueue;
1601 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1604 * start up the nfsiod workqueue
1606 static int nfsiod_start(void)
1608 struct workqueue_struct *wq;
1609 dprintk("RPC: creating workqueue nfsiod\n");
1610 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1613 nfsiod_workqueue = wq;
1618 * Destroy the nfsiod workqueue
1620 static void nfsiod_stop(void)
1622 struct workqueue_struct *wq;
1624 wq = nfsiod_workqueue;
1627 nfsiod_workqueue = NULL;
1628 destroy_workqueue(wq);
1632 EXPORT_SYMBOL_GPL(nfs_net_id);
1634 static int nfs_net_init(struct net *net)
1636 nfs_clients_init(net);
1637 return nfs_dns_resolver_cache_init(net);
1640 static void nfs_net_exit(struct net *net)
1642 nfs_dns_resolver_cache_destroy(net);
1643 nfs_cleanup_cb_ident_idr(net);
1646 static struct pernet_operations nfs_net_ops = {
1647 .init = nfs_net_init,
1648 .exit = nfs_net_exit,
1650 .size = sizeof(struct nfs_net),
1656 static int __init init_nfs_fs(void)
1660 err = nfs_dns_resolver_init();
1664 err = register_pernet_subsys(&nfs_net_ops);
1668 err = nfs_fscache_register();
1672 err = nfsiod_start();
1676 err = nfs_fs_proc_init();
1680 err = nfs_init_nfspagecache();
1684 err = nfs_init_inodecache();
1688 err = nfs_init_readpagecache();
1692 err = nfs_init_writepagecache();
1696 err = nfs_init_directcache();
1700 #ifdef CONFIG_PROC_FS
1701 rpc_proc_register(&init_net, &nfs_rpcstat);
1703 if ((err = register_nfs_fs()) != 0)
1708 #ifdef CONFIG_PROC_FS
1709 rpc_proc_unregister(&init_net, "nfs");
1711 nfs_destroy_directcache();
1713 nfs_destroy_writepagecache();
1715 nfs_destroy_readpagecache();
1717 nfs_destroy_inodecache();
1719 nfs_destroy_nfspagecache();
1725 nfs_fscache_unregister();
1727 unregister_pernet_subsys(&nfs_net_ops);
1729 nfs_dns_resolver_destroy();
1734 static void __exit exit_nfs_fs(void)
1736 nfs_destroy_directcache();
1737 nfs_destroy_writepagecache();
1738 nfs_destroy_readpagecache();
1739 nfs_destroy_inodecache();
1740 nfs_destroy_nfspagecache();
1741 nfs_fscache_unregister();
1742 unregister_pernet_subsys(&nfs_net_ops);
1743 nfs_dns_resolver_destroy();
1744 #ifdef CONFIG_PROC_FS
1745 rpc_proc_unregister(&init_net, "nfs");
1747 unregister_nfs_fs();
1752 /* Not quite true; I just maintain it */
1754 MODULE_LICENSE("GPL");
1755 module_param(enable_ino64, bool, 0644);
1757 module_init(init_nfs_fs)
1758 module_exit(exit_nfs_fs)