4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sched.h>
19 #include <linux/time.h>
20 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/nfs_idmap.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
43 #include <asm/system.h>
44 #include <asm/uaccess.h>
48 #include "delegation.h"
52 #include "dns_resolve.h"
56 #define NFSDBG_FACILITY NFSDBG_VFS
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66 static struct kmem_cache * nfs_inode_cachep;
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 return nfs_fileid_to_ino_t(fattr->fileid);
75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
76 * @word: long word containing the bit lock
78 int nfs_wait_bit_killable(void *word)
80 if (fatal_signal_pending(current))
87 * nfs_compat_user_ino64 - returns the user-visible inode number
88 * @fileid: 64-bit fileid
90 * This function returns a 32-bit inode number if the boot parameter
91 * nfs.enable_ino64 is zero.
93 u64 nfs_compat_user_ino64(u64 fileid)
104 if (sizeof(ino) < sizeof(fileid))
105 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
109 static void nfs_clear_inode(struct inode *inode)
112 * The following should never happen...
114 BUG_ON(nfs_have_writebacks(inode));
115 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
116 nfs_zap_acl_cache(inode);
117 nfs_access_zap_cache(inode);
118 nfs_fscache_release_inode_cookie(inode);
121 void nfs_evict_inode(struct inode *inode)
123 truncate_inode_pages(&inode->i_data, 0);
124 end_writeback(inode);
125 nfs_clear_inode(inode);
129 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
131 int nfs_sync_mapping(struct address_space *mapping)
135 if (mapping->nrpages != 0) {
136 unmap_mapping_range(mapping, 0, 0, 0);
137 ret = nfs_wb_all(mapping->host);
143 * Invalidate the local caches
145 static void nfs_zap_caches_locked(struct inode *inode)
147 struct nfs_inode *nfsi = NFS_I(inode);
148 int mode = inode->i_mode;
150 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
152 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
153 nfsi->attrtimeo_timestamp = jiffies;
155 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
156 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
157 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
159 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
162 void nfs_zap_caches(struct inode *inode)
164 spin_lock(&inode->i_lock);
165 nfs_zap_caches_locked(inode);
166 spin_unlock(&inode->i_lock);
169 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
171 if (mapping->nrpages != 0) {
172 spin_lock(&inode->i_lock);
173 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
174 spin_unlock(&inode->i_lock);
178 void nfs_zap_acl_cache(struct inode *inode)
180 void (*clear_acl_cache)(struct inode *);
182 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
183 if (clear_acl_cache != NULL)
184 clear_acl_cache(inode);
185 spin_lock(&inode->i_lock);
186 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
187 spin_unlock(&inode->i_lock);
190 void nfs_invalidate_atime(struct inode *inode)
192 spin_lock(&inode->i_lock);
193 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
194 spin_unlock(&inode->i_lock);
198 * Invalidate, but do not unhash, the inode.
199 * NB: must be called with inode->i_lock held!
201 static void nfs_invalidate_inode(struct inode *inode)
203 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
204 nfs_zap_caches_locked(inode);
207 struct nfs_find_desc {
209 struct nfs_fattr *fattr;
213 * In NFSv3 we can have 64bit inode numbers. In order to support
214 * this, and re-exported directories (also seen in NFSv2)
215 * we are forced to allow 2 different inodes to have the same
219 nfs_find_actor(struct inode *inode, void *opaque)
221 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
222 struct nfs_fh *fh = desc->fh;
223 struct nfs_fattr *fattr = desc->fattr;
225 if (NFS_FILEID(inode) != fattr->fileid)
227 if (nfs_compare_fh(NFS_FH(inode), fh))
229 if (is_bad_inode(inode) || NFS_STALE(inode))
235 nfs_init_locked(struct inode *inode, void *opaque)
237 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
238 struct nfs_fattr *fattr = desc->fattr;
240 set_nfs_fileid(inode, fattr->fileid);
241 nfs_copy_fh(NFS_FH(inode), desc->fh);
246 * This is our front-end to iget that looks up inodes by file handle
247 * instead of inode number.
250 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
252 struct nfs_find_desc desc = {
256 struct inode *inode = ERR_PTR(-ENOENT);
259 nfs_attr_check_mountpoint(sb, fattr);
261 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
262 !nfs_attr_use_mounted_on_fileid(fattr))
264 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
267 hash = nfs_fattr_to_ino_t(fattr);
269 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
271 inode = ERR_PTR(-ENOMEM);
275 if (inode->i_state & I_NEW) {
276 struct nfs_inode *nfsi = NFS_I(inode);
277 unsigned long now = jiffies;
279 /* We set i_ino for the few things that still rely on it,
283 /* We can't support update_atime(), since the server will reset it */
284 inode->i_flags |= S_NOATIME|S_NOCMTIME;
285 inode->i_mode = fattr->mode;
286 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
287 && nfs_server_capable(inode, NFS_CAP_MODE))
288 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
289 | NFS_INO_INVALID_ACCESS
290 | NFS_INO_INVALID_ACL;
291 /* Why so? Because we want revalidate for devices/FIFOs, and
292 * that's precisely what we have in nfs_file_inode_operations.
294 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
295 if (S_ISREG(inode->i_mode)) {
296 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
297 inode->i_data.a_ops = &nfs_file_aops;
298 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
299 } else if (S_ISDIR(inode->i_mode)) {
300 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
301 inode->i_fop = &nfs_dir_operations;
302 inode->i_data.a_ops = &nfs_dir_aops;
303 if (nfs_server_capable(inode, NFS_CAP_READDIRPLUS))
304 set_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags);
305 /* Deal with crossing mountpoints */
306 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
307 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
308 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
309 inode->i_op = &nfs_referral_inode_operations;
311 inode->i_op = &nfs_mountpoint_inode_operations;
313 inode->i_flags |= S_AUTOMOUNT;
315 } else if (S_ISLNK(inode->i_mode))
316 inode->i_op = &nfs_symlink_inode_operations;
318 init_special_inode(inode, inode->i_mode, fattr->rdev);
320 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
321 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
322 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
323 inode->i_version = 0;
329 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
331 nfsi->read_cache_jiffies = fattr->time_start;
332 nfsi->attr_gencount = fattr->gencount;
333 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
334 inode->i_atime = fattr->atime;
335 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
336 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
337 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
338 inode->i_mtime = fattr->mtime;
339 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
340 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
341 | NFS_INO_INVALID_DATA;
342 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
343 inode->i_ctime = fattr->ctime;
344 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
345 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
346 | NFS_INO_INVALID_ACCESS
347 | NFS_INO_INVALID_ACL;
348 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
349 inode->i_version = fattr->change_attr;
350 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
351 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
352 | NFS_INO_INVALID_DATA;
353 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
354 inode->i_size = nfs_size_to_loff_t(fattr->size);
356 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
357 | NFS_INO_INVALID_DATA
358 | NFS_INO_REVAL_PAGECACHE;
359 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
360 set_nlink(inode, fattr->nlink);
361 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
362 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
363 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
364 inode->i_uid = fattr->uid;
365 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
366 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
367 | NFS_INO_INVALID_ACCESS
368 | NFS_INO_INVALID_ACL;
369 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
370 inode->i_gid = fattr->gid;
371 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
372 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
373 | NFS_INO_INVALID_ACCESS
374 | NFS_INO_INVALID_ACL;
375 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
376 inode->i_blocks = fattr->du.nfs2.blocks;
377 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
379 * report the blocks in 512byte units
381 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
383 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
384 nfsi->attrtimeo_timestamp = now;
385 nfsi->access_cache = RB_ROOT;
387 nfs_fscache_init_inode_cookie(inode);
389 unlock_new_inode(inode);
391 nfs_refresh_inode(inode, fattr);
392 dprintk("NFS: nfs_fhget(%s/%Ld ct=%d)\n",
394 (long long)NFS_FILEID(inode),
395 atomic_read(&inode->i_count));
401 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
405 #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)
408 nfs_setattr(struct dentry *dentry, struct iattr *attr)
410 struct inode *inode = dentry->d_inode;
411 struct nfs_fattr *fattr;
414 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
416 /* skip mode change if it's just for clearing setuid/setgid */
417 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
418 attr->ia_valid &= ~ATTR_MODE;
420 if (attr->ia_valid & ATTR_SIZE) {
421 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
422 attr->ia_valid &= ~ATTR_SIZE;
425 /* Optimization: if the end result is no change, don't RPC */
426 attr->ia_valid &= NFS_VALID_ATTRS;
427 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
430 /* Write all dirty data */
431 if (S_ISREG(inode->i_mode))
434 fattr = nfs_alloc_fattr();
438 * Return any delegations if we're going to change ACLs
440 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
441 nfs_inode_return_delegation(inode);
442 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
444 nfs_refresh_inode(inode, fattr);
445 nfs_free_fattr(fattr);
451 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
452 * @inode: inode of the file used
453 * @offset: file offset to start truncating
455 * This is a copy of the common vmtruncate, but with the locking
456 * corrected to take into account the fact that NFS requires
457 * inode->i_size to be updated under the inode->i_lock.
459 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
464 err = inode_newsize_ok(inode, offset);
468 spin_lock(&inode->i_lock);
469 oldsize = inode->i_size;
470 i_size_write(inode, offset);
471 spin_unlock(&inode->i_lock);
473 truncate_pagecache(inode, oldsize, offset);
479 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
480 * @inode: pointer to struct inode
481 * @attr: pointer to struct iattr
483 * Note: we do this in the *proc.c in order to ensure that
484 * it works for things like exclusive creates too.
486 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
488 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
489 spin_lock(&inode->i_lock);
490 if ((attr->ia_valid & ATTR_MODE) != 0) {
491 int mode = attr->ia_mode & S_IALLUGO;
492 mode |= inode->i_mode & ~S_IALLUGO;
493 inode->i_mode = mode;
495 if ((attr->ia_valid & ATTR_UID) != 0)
496 inode->i_uid = attr->ia_uid;
497 if ((attr->ia_valid & ATTR_GID) != 0)
498 inode->i_gid = attr->ia_gid;
499 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
500 spin_unlock(&inode->i_lock);
502 if ((attr->ia_valid & ATTR_SIZE) != 0) {
503 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
504 nfs_vmtruncate(inode, attr->ia_size);
508 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
510 struct inode *inode = dentry->d_inode;
511 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
514 /* Flush out writes to the server in order to update c/mtime. */
515 if (S_ISREG(inode->i_mode)) {
516 err = filemap_write_and_wait(inode->i_mapping);
522 * We may force a getattr if the user cares about atime.
524 * Note that we only have to check the vfsmount flags here:
525 * - NFS always sets S_NOATIME by so checking it would give a
527 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
528 * no point in checking those.
530 if ((mnt->mnt_flags & MNT_NOATIME) ||
531 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
535 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
537 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
539 generic_fillattr(inode, stat);
540 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
546 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
548 atomic_set(&l_ctx->count, 1);
549 l_ctx->lockowner = current->files;
550 l_ctx->pid = current->tgid;
551 INIT_LIST_HEAD(&l_ctx->list);
554 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
556 struct nfs_lock_context *pos;
558 list_for_each_entry(pos, &ctx->lock_context.list, list) {
559 if (pos->lockowner != current->files)
561 if (pos->pid != current->tgid)
563 atomic_inc(&pos->count);
569 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
571 struct nfs_lock_context *res, *new = NULL;
572 struct inode *inode = ctx->dentry->d_inode;
574 spin_lock(&inode->i_lock);
575 res = __nfs_find_lock_context(ctx);
577 spin_unlock(&inode->i_lock);
578 new = kmalloc(sizeof(*new), GFP_KERNEL);
581 nfs_init_lock_context(new);
582 spin_lock(&inode->i_lock);
583 res = __nfs_find_lock_context(ctx);
585 list_add_tail(&new->list, &ctx->lock_context.list);
586 new->open_context = ctx;
591 spin_unlock(&inode->i_lock);
596 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
598 struct nfs_open_context *ctx = l_ctx->open_context;
599 struct inode *inode = ctx->dentry->d_inode;
601 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
603 list_del(&l_ctx->list);
604 spin_unlock(&inode->i_lock);
609 * nfs_close_context - Common close_context() routine NFSv2/v3
610 * @ctx: pointer to context
611 * @is_sync: is this a synchronous close
613 * always ensure that the attributes are up to date if we're mounted
614 * with close-to-open semantics
616 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
619 struct nfs_server *server;
621 if (!(ctx->mode & FMODE_WRITE))
625 inode = ctx->dentry->d_inode;
626 if (!list_empty(&NFS_I(inode)->open_files))
628 server = NFS_SERVER(inode);
629 if (server->flags & NFS_MOUNT_NOCTO)
631 nfs_revalidate_inode(server, inode);
634 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
636 struct nfs_open_context *ctx;
637 struct rpc_cred *cred = rpc_lookup_cred();
639 return ERR_CAST(cred);
641 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
644 return ERR_PTR(-ENOMEM);
646 nfs_sb_active(dentry->d_sb);
647 ctx->dentry = dget(dentry);
653 nfs_init_lock_context(&ctx->lock_context);
654 ctx->lock_context.open_context = ctx;
655 INIT_LIST_HEAD(&ctx->list);
659 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
662 atomic_inc(&ctx->lock_context.count);
666 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
668 struct inode *inode = ctx->dentry->d_inode;
669 struct super_block *sb = ctx->dentry->d_sb;
671 if (!list_empty(&ctx->list)) {
672 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
674 list_del(&ctx->list);
675 spin_unlock(&inode->i_lock);
676 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
679 NFS_PROTO(inode)->close_context(ctx, is_sync);
680 if (ctx->cred != NULL)
681 put_rpccred(ctx->cred);
687 void put_nfs_open_context(struct nfs_open_context *ctx)
689 __put_nfs_open_context(ctx, 0);
693 * Ensure that mmap has a recent RPC credential for use when writing out
696 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
698 struct inode *inode = filp->f_path.dentry->d_inode;
699 struct nfs_inode *nfsi = NFS_I(inode);
701 filp->private_data = get_nfs_open_context(ctx);
702 spin_lock(&inode->i_lock);
703 list_add(&ctx->list, &nfsi->open_files);
704 spin_unlock(&inode->i_lock);
708 * Given an inode, search for an open context with the desired characteristics
710 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
712 struct nfs_inode *nfsi = NFS_I(inode);
713 struct nfs_open_context *pos, *ctx = NULL;
715 spin_lock(&inode->i_lock);
716 list_for_each_entry(pos, &nfsi->open_files, list) {
717 if (cred != NULL && pos->cred != cred)
719 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
721 ctx = get_nfs_open_context(pos);
724 spin_unlock(&inode->i_lock);
728 static void nfs_file_clear_open_context(struct file *filp)
730 struct inode *inode = filp->f_path.dentry->d_inode;
731 struct nfs_open_context *ctx = nfs_file_open_context(filp);
734 filp->private_data = NULL;
735 spin_lock(&inode->i_lock);
736 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
737 spin_unlock(&inode->i_lock);
738 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
743 * These allocate and release file read/write context information.
745 int nfs_open(struct inode *inode, struct file *filp)
747 struct nfs_open_context *ctx;
749 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
752 nfs_file_set_open_context(filp, ctx);
753 put_nfs_open_context(ctx);
754 nfs_fscache_set_inode_cookie(inode, filp);
758 int nfs_release(struct inode *inode, struct file *filp)
760 nfs_file_clear_open_context(filp);
765 * This function is called whenever some part of NFS notices that
766 * the cached attributes have to be refreshed.
769 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
771 int status = -ESTALE;
772 struct nfs_fattr *fattr = NULL;
773 struct nfs_inode *nfsi = NFS_I(inode);
775 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
776 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
778 if (is_bad_inode(inode))
780 if (NFS_STALE(inode))
784 fattr = nfs_alloc_fattr();
788 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
789 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
791 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
793 (long long)NFS_FILEID(inode), status);
794 if (status == -ESTALE) {
795 nfs_zap_caches(inode);
796 if (!S_ISDIR(inode->i_mode))
797 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
802 status = nfs_refresh_inode(inode, fattr);
804 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
806 (long long)NFS_FILEID(inode), status);
810 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
811 nfs_zap_acl_cache(inode);
813 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
815 (long long)NFS_FILEID(inode));
818 nfs_free_fattr(fattr);
822 int nfs_attribute_timeout(struct inode *inode)
824 struct nfs_inode *nfsi = NFS_I(inode);
826 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
829 static int nfs_attribute_cache_expired(struct inode *inode)
831 if (nfs_have_delegated_attributes(inode))
833 return nfs_attribute_timeout(inode);
837 * nfs_revalidate_inode - Revalidate the inode attributes
838 * @server - pointer to nfs_server struct
839 * @inode - pointer to inode struct
841 * Updates inode attribute information by retrieving the data from the server.
843 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
845 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
846 && !nfs_attribute_cache_expired(inode))
847 return NFS_STALE(inode) ? -ESTALE : 0;
848 return __nfs_revalidate_inode(server, inode);
851 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
853 struct nfs_inode *nfsi = NFS_I(inode);
855 if (mapping->nrpages != 0) {
856 int ret = invalidate_inode_pages2(mapping);
860 spin_lock(&inode->i_lock);
861 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
862 if (S_ISDIR(inode->i_mode))
863 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
864 spin_unlock(&inode->i_lock);
865 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
866 nfs_fscache_reset_inode_cookie(inode);
867 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
868 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
873 * nfs_revalidate_mapping - Revalidate the pagecache
874 * @inode - pointer to host inode
875 * @mapping - pointer to mapping
877 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
879 struct nfs_inode *nfsi = NFS_I(inode);
882 if ((nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
883 || nfs_attribute_cache_expired(inode)
884 || NFS_STALE(inode)) {
885 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
889 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
890 ret = nfs_invalidate_mapping(inode, mapping);
895 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
897 struct nfs_inode *nfsi = NFS_I(inode);
898 unsigned long ret = 0;
900 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
901 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
902 && inode->i_version == fattr->pre_change_attr) {
903 inode->i_version = fattr->change_attr;
904 if (S_ISDIR(inode->i_mode))
905 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
906 ret |= NFS_INO_INVALID_ATTR;
908 /* If we have atomic WCC data, we may update some attributes */
909 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
910 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
911 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
912 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
913 ret |= NFS_INO_INVALID_ATTR;
916 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
917 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
918 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
919 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
920 if (S_ISDIR(inode->i_mode))
921 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
922 ret |= NFS_INO_INVALID_ATTR;
924 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
925 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
926 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
927 && nfsi->npages == 0) {
928 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
929 ret |= NFS_INO_INVALID_ATTR;
935 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
936 * @inode - pointer to inode
937 * @fattr - updated attributes
939 * Verifies the attribute cache. If we have just changed the attributes,
940 * so that fattr carries weak cache consistency data, then it may
941 * also update the ctime/mtime/change_attribute.
943 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
945 struct nfs_inode *nfsi = NFS_I(inode);
946 loff_t cur_size, new_isize;
947 unsigned long invalid = 0;
950 /* Has the inode gone and changed behind our back? */
951 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
953 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
956 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
957 inode->i_version != fattr->change_attr)
958 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
960 /* Verify a few of the more important attributes */
961 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
962 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
964 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
965 cur_size = i_size_read(inode);
966 new_isize = nfs_size_to_loff_t(fattr->size);
967 if (cur_size != new_isize && nfsi->npages == 0)
968 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
971 /* Have any file permissions changed? */
972 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
973 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
974 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
975 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
976 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
977 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
979 /* Has the link count changed? */
980 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
981 invalid |= NFS_INO_INVALID_ATTR;
983 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
984 invalid |= NFS_INO_INVALID_ATIME;
987 nfsi->cache_validity |= invalid;
989 nfsi->read_cache_jiffies = fattr->time_start;
993 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
995 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
997 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1000 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1002 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1004 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1007 static atomic_long_t nfs_attr_generation_counter;
1009 static unsigned long nfs_read_attr_generation_counter(void)
1011 return atomic_long_read(&nfs_attr_generation_counter);
1014 unsigned long nfs_inc_attr_generation_counter(void)
1016 return atomic_long_inc_return(&nfs_attr_generation_counter);
1019 void nfs_fattr_init(struct nfs_fattr *fattr)
1022 fattr->time_start = jiffies;
1023 fattr->gencount = nfs_inc_attr_generation_counter();
1024 fattr->owner_name = NULL;
1025 fattr->group_name = NULL;
1028 struct nfs_fattr *nfs_alloc_fattr(void)
1030 struct nfs_fattr *fattr;
1032 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1034 nfs_fattr_init(fattr);
1038 struct nfs_fh *nfs_alloc_fhandle(void)
1042 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1049 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1050 * @inode - pointer to inode
1051 * @fattr - attributes
1053 * Attempt to divine whether or not an RPC call reply carrying stale
1054 * attributes got scheduled after another call carrying updated ones.
1056 * To do so, the function first assumes that a more recent ctime means
1057 * that the attributes in fattr are newer, however it also attempt to
1058 * catch the case where ctime either didn't change, or went backwards
1059 * (if someone reset the clock on the server) by looking at whether
1060 * or not this RPC call was started after the inode was last updated.
1061 * Note also the check for wraparound of 'attr_gencount'
1063 * The function returns 'true' if it thinks the attributes in 'fattr' are
1064 * more recent than the ones cached in the inode.
1067 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1069 const struct nfs_inode *nfsi = NFS_I(inode);
1071 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1072 nfs_ctime_need_update(inode, fattr) ||
1073 nfs_size_need_update(inode, fattr) ||
1074 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1077 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1079 if (nfs_inode_attrs_need_update(inode, fattr))
1080 return nfs_update_inode(inode, fattr);
1081 return nfs_check_inode_attributes(inode, fattr);
1085 * nfs_refresh_inode - try to update the inode attribute cache
1086 * @inode - pointer to inode
1087 * @fattr - updated attributes
1089 * Check that an RPC call that returned attributes has not overlapped with
1090 * other recent updates of the inode metadata, then decide whether it is
1091 * safe to do a full update of the inode attributes, or whether just to
1092 * call nfs_check_inode_attributes.
1094 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1098 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1100 spin_lock(&inode->i_lock);
1101 status = nfs_refresh_inode_locked(inode, fattr);
1102 spin_unlock(&inode->i_lock);
1107 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1109 struct nfs_inode *nfsi = NFS_I(inode);
1111 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1112 if (S_ISDIR(inode->i_mode))
1113 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1114 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1116 return nfs_refresh_inode_locked(inode, fattr);
1120 * nfs_post_op_update_inode - try to update the inode attribute cache
1121 * @inode - pointer to inode
1122 * @fattr - updated attributes
1124 * After an operation that has changed the inode metadata, mark the
1125 * attribute cache as being invalid, then try to update it.
1127 * NB: if the server didn't return any post op attributes, this
1128 * function will force the retrieval of attributes before the next
1129 * NFS request. Thus it should be used only for operations that
1130 * are expected to change one or more attributes, to avoid
1131 * unnecessary NFS requests and trips through nfs_update_inode().
1133 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1137 spin_lock(&inode->i_lock);
1138 status = nfs_post_op_update_inode_locked(inode, fattr);
1139 spin_unlock(&inode->i_lock);
1144 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1145 * @inode - pointer to inode
1146 * @fattr - updated attributes
1148 * After an operation that has changed the inode metadata, mark the
1149 * attribute cache as being invalid, then try to update it. Fake up
1150 * weak cache consistency data, if none exist.
1152 * This function is mainly designed to be used by the ->write_done() functions.
1154 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1158 spin_lock(&inode->i_lock);
1159 /* Don't do a WCC update if these attributes are already stale */
1160 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1161 !nfs_inode_attrs_need_update(inode, fattr)) {
1162 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1163 | NFS_ATTR_FATTR_PRESIZE
1164 | NFS_ATTR_FATTR_PREMTIME
1165 | NFS_ATTR_FATTR_PRECTIME);
1168 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1169 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1170 fattr->pre_change_attr = inode->i_version;
1171 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1173 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1174 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1175 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1176 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1178 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1179 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1180 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1181 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1183 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1184 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1185 fattr->pre_size = i_size_read(inode);
1186 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1189 status = nfs_post_op_update_inode_locked(inode, fattr);
1190 spin_unlock(&inode->i_lock);
1195 * Many nfs protocol calls return the new file attributes after
1196 * an operation. Here we update the inode to reflect the state
1197 * of the server's inode.
1199 * This is a bit tricky because we have to make sure all dirty pages
1200 * have been sent off to the server before calling invalidate_inode_pages.
1201 * To make sure no other process adds more write requests while we try
1202 * our best to flush them, we make them sleep during the attribute refresh.
1204 * A very similar scenario holds for the dir cache.
1206 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1208 struct nfs_server *server;
1209 struct nfs_inode *nfsi = NFS_I(inode);
1210 loff_t cur_isize, new_isize;
1211 unsigned long invalid = 0;
1212 unsigned long now = jiffies;
1213 unsigned long save_cache_validity;
1215 dfprintk(VFS, "NFS: %s(%s/%ld ct=%d info=0x%x)\n",
1216 __func__, inode->i_sb->s_id, inode->i_ino,
1217 atomic_read(&inode->i_count), fattr->valid);
1219 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1223 * Make sure the inode's type hasn't changed.
1225 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1228 server = NFS_SERVER(inode);
1229 /* Update the fsid? */
1230 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1231 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1232 !IS_AUTOMOUNT(inode))
1233 server->fsid = fattr->fsid;
1236 * Update the read time so we don't revalidate too often.
1238 nfsi->read_cache_jiffies = fattr->time_start;
1240 save_cache_validity = nfsi->cache_validity;
1241 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1242 | NFS_INO_INVALID_ATIME
1243 | NFS_INO_REVAL_FORCED
1244 | NFS_INO_REVAL_PAGECACHE);
1246 /* Do atomic weak cache consistency updates */
1247 invalid |= nfs_wcc_update_inode(inode, fattr);
1249 /* More cache consistency checks */
1250 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1251 if (inode->i_version != fattr->change_attr) {
1252 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1253 inode->i_sb->s_id, inode->i_ino);
1254 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1255 if (S_ISDIR(inode->i_mode))
1256 nfs_force_lookup_revalidate(inode);
1257 inode->i_version = fattr->change_attr;
1259 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1260 invalid |= save_cache_validity;
1262 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1263 /* NFSv2/v3: Check if the mtime agrees */
1264 if (!timespec_equal(&inode->i_mtime, &fattr->mtime)) {
1265 dprintk("NFS: mtime change on server for file %s/%ld\n",
1266 inode->i_sb->s_id, inode->i_ino);
1267 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1268 if (S_ISDIR(inode->i_mode))
1269 nfs_force_lookup_revalidate(inode);
1270 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1272 } else if (server->caps & NFS_CAP_MTIME)
1273 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1274 | NFS_INO_INVALID_DATA
1275 | NFS_INO_REVAL_PAGECACHE
1276 | NFS_INO_REVAL_FORCED);
1278 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1279 /* If ctime has changed we should definitely clear access+acl caches */
1280 if (!timespec_equal(&inode->i_ctime, &fattr->ctime)) {
1281 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1282 /* and probably clear data for a directory too as utimes can cause
1283 * havoc with our cache.
1285 if (S_ISDIR(inode->i_mode)) {
1286 invalid |= NFS_INO_INVALID_DATA;
1287 nfs_force_lookup_revalidate(inode);
1289 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1291 } else if (server->caps & NFS_CAP_CTIME)
1292 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1293 | NFS_INO_INVALID_ACCESS
1294 | NFS_INO_INVALID_ACL
1295 | NFS_INO_REVAL_FORCED);
1297 /* Check if our cached file size is stale */
1298 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1299 new_isize = nfs_size_to_loff_t(fattr->size);
1300 cur_isize = i_size_read(inode);
1301 if (new_isize != cur_isize) {
1302 /* Do we perhaps have any outstanding writes, or has
1303 * the file grown beyond our last write? */
1304 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1305 new_isize > cur_isize) {
1306 i_size_write(inode, new_isize);
1307 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1309 dprintk("NFS: isize change on server for file %s/%ld "
1313 (long long)cur_isize,
1314 (long long)new_isize);
1317 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1318 | NFS_INO_REVAL_PAGECACHE
1319 | NFS_INO_REVAL_FORCED);
1322 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1323 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1324 else if (server->caps & NFS_CAP_ATIME)
1325 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1326 | NFS_INO_REVAL_FORCED);
1328 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1329 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1330 umode_t newmode = inode->i_mode & S_IFMT;
1331 newmode |= fattr->mode & S_IALLUGO;
1332 inode->i_mode = newmode;
1333 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1335 } else if (server->caps & NFS_CAP_MODE)
1336 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1337 | NFS_INO_INVALID_ACCESS
1338 | NFS_INO_INVALID_ACL
1339 | NFS_INO_REVAL_FORCED);
1341 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1342 if (inode->i_uid != fattr->uid) {
1343 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1344 inode->i_uid = fattr->uid;
1346 } else if (server->caps & NFS_CAP_OWNER)
1347 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1348 | NFS_INO_INVALID_ACCESS
1349 | NFS_INO_INVALID_ACL
1350 | NFS_INO_REVAL_FORCED);
1352 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1353 if (inode->i_gid != fattr->gid) {
1354 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1355 inode->i_gid = fattr->gid;
1357 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1358 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1359 | NFS_INO_INVALID_ACCESS
1360 | NFS_INO_INVALID_ACL
1361 | NFS_INO_REVAL_FORCED);
1363 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1364 if (inode->i_nlink != fattr->nlink) {
1365 invalid |= NFS_INO_INVALID_ATTR;
1366 if (S_ISDIR(inode->i_mode))
1367 invalid |= NFS_INO_INVALID_DATA;
1368 set_nlink(inode, fattr->nlink);
1370 } else if (server->caps & NFS_CAP_NLINK)
1371 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1372 | NFS_INO_REVAL_FORCED);
1374 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1376 * report the blocks in 512byte units
1378 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1380 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1381 inode->i_blocks = fattr->du.nfs2.blocks;
1383 /* Update attrtimeo value if we're out of the unstable period */
1384 if (invalid & NFS_INO_INVALID_ATTR) {
1385 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1386 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1387 nfsi->attrtimeo_timestamp = now;
1388 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1390 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1391 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1392 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1393 nfsi->attrtimeo_timestamp = now;
1396 invalid &= ~NFS_INO_INVALID_ATTR;
1397 /* Don't invalidate the data if we were to blame */
1398 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1399 || S_ISLNK(inode->i_mode)))
1400 invalid &= ~NFS_INO_INVALID_DATA;
1401 if (!nfs_have_delegation(inode, FMODE_READ) ||
1402 (save_cache_validity & NFS_INO_REVAL_FORCED))
1403 nfsi->cache_validity |= invalid;
1408 * Big trouble! The inode has become a different object.
1410 printk(KERN_DEBUG "%s: inode %ld mode changed, %07o to %07o\n",
1411 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1414 * No need to worry about unhashing the dentry, as the
1415 * lookup validation will know that the inode is bad.
1416 * (But we fall through to invalidate the caches.)
1418 nfs_invalidate_inode(inode);
1422 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1423 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1424 NFS_SERVER(inode)->nfs_client->cl_hostname, inode->i_sb->s_id,
1425 (long long)nfsi->fileid, (long long)fattr->fileid);
1430 #ifdef CONFIG_NFS_V4
1433 * Clean out any remaining NFSv4 state that might be left over due
1434 * to open() calls that passed nfs_atomic_lookup, but failed to call
1437 void nfs4_evict_inode(struct inode *inode)
1439 truncate_inode_pages(&inode->i_data, 0);
1440 end_writeback(inode);
1441 pnfs_return_layout(inode);
1442 pnfs_destroy_layout(NFS_I(inode));
1443 /* If we are holding a delegation, return it! */
1444 nfs_inode_return_delegation_noreclaim(inode);
1445 /* First call standard NFS clear_inode() code */
1446 nfs_clear_inode(inode);
1450 struct inode *nfs_alloc_inode(struct super_block *sb)
1452 struct nfs_inode *nfsi;
1453 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1457 nfsi->cache_validity = 0UL;
1458 #ifdef CONFIG_NFS_V3_ACL
1459 nfsi->acl_access = ERR_PTR(-EAGAIN);
1460 nfsi->acl_default = ERR_PTR(-EAGAIN);
1462 #ifdef CONFIG_NFS_V4
1463 nfsi->nfs4_acl = NULL;
1464 #endif /* CONFIG_NFS_V4 */
1465 return &nfsi->vfs_inode;
1468 static void nfs_i_callback(struct rcu_head *head)
1470 struct inode *inode = container_of(head, struct inode, i_rcu);
1471 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1474 void nfs_destroy_inode(struct inode *inode)
1476 call_rcu(&inode->i_rcu, nfs_i_callback);
1479 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1481 #ifdef CONFIG_NFS_V4
1482 INIT_LIST_HEAD(&nfsi->open_states);
1483 nfsi->delegation = NULL;
1484 nfsi->delegation_state = 0;
1485 init_rwsem(&nfsi->rwsem);
1486 nfsi->layout = NULL;
1487 atomic_set(&nfsi->commits_outstanding, 0);
1491 static void init_once(void *foo)
1493 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1495 inode_init_once(&nfsi->vfs_inode);
1496 INIT_LIST_HEAD(&nfsi->open_files);
1497 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1498 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1499 INIT_RADIX_TREE(&nfsi->nfs_page_tree, GFP_ATOMIC);
1502 atomic_set(&nfsi->silly_count, 1);
1503 INIT_HLIST_HEAD(&nfsi->silly_list);
1504 init_waitqueue_head(&nfsi->waitqueue);
1505 nfs4_init_once(nfsi);
1508 static int __init nfs_init_inodecache(void)
1510 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1511 sizeof(struct nfs_inode),
1512 0, (SLAB_RECLAIM_ACCOUNT|
1515 if (nfs_inode_cachep == NULL)
1521 static void nfs_destroy_inodecache(void)
1523 kmem_cache_destroy(nfs_inode_cachep);
1526 struct workqueue_struct *nfsiod_workqueue;
1529 * start up the nfsiod workqueue
1531 static int nfsiod_start(void)
1533 struct workqueue_struct *wq;
1534 dprintk("RPC: creating workqueue nfsiod\n");
1535 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1538 nfsiod_workqueue = wq;
1543 * Destroy the nfsiod workqueue
1545 static void nfsiod_stop(void)
1547 struct workqueue_struct *wq;
1549 wq = nfsiod_workqueue;
1552 nfsiod_workqueue = NULL;
1553 destroy_workqueue(wq);
1557 EXPORT_SYMBOL_GPL(nfs_net_id);
1559 static int nfs_net_init(struct net *net)
1561 return nfs_dns_resolver_cache_init(net);
1564 static void nfs_net_exit(struct net *net)
1566 nfs_dns_resolver_cache_destroy(net);
1569 static struct pernet_operations nfs_net_ops = {
1570 .init = nfs_net_init,
1571 .exit = nfs_net_exit,
1573 .size = sizeof(struct nfs_net),
1579 static int __init init_nfs_fs(void)
1583 err = nfs_idmap_init();
1587 err = nfs_dns_resolver_init();
1591 err = register_pernet_subsys(&nfs_net_ops);
1595 err = nfs_fscache_register();
1599 err = nfsiod_start();
1603 err = nfs_fs_proc_init();
1607 err = nfs_init_nfspagecache();
1611 err = nfs_init_inodecache();
1615 err = nfs_init_readpagecache();
1619 err = nfs_init_writepagecache();
1623 err = nfs_init_directcache();
1627 #ifdef CONFIG_PROC_FS
1628 rpc_proc_register(&init_net, &nfs_rpcstat);
1630 if ((err = register_nfs_fs()) != 0)
1634 #ifdef CONFIG_PROC_FS
1635 rpc_proc_unregister(&init_net, "nfs");
1637 nfs_destroy_directcache();
1639 nfs_destroy_writepagecache();
1641 nfs_destroy_readpagecache();
1643 nfs_destroy_inodecache();
1645 nfs_destroy_nfspagecache();
1651 nfs_fscache_unregister();
1653 unregister_pernet_subsys(&nfs_net_ops);
1655 nfs_dns_resolver_destroy();
1662 static void __exit exit_nfs_fs(void)
1664 nfs_destroy_directcache();
1665 nfs_destroy_writepagecache();
1666 nfs_destroy_readpagecache();
1667 nfs_destroy_inodecache();
1668 nfs_destroy_nfspagecache();
1669 nfs_fscache_unregister();
1670 unregister_pernet_subsys(&nfs_net_ops);
1671 nfs_dns_resolver_destroy();
1673 #ifdef CONFIG_PROC_FS
1674 rpc_proc_unregister(&init_net, "nfs");
1676 nfs_cleanup_cb_ident_idr();
1677 unregister_nfs_fs();
1682 /* Not quite true; I just maintain it */
1683 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1684 MODULE_LICENSE("GPL");
1685 module_param(enable_ino64, bool, 0644);
1687 module_init(init_nfs_fs)
1688 module_exit(exit_nfs_fs)