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/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"
55 #define NFSDBG_FACILITY NFSDBG_VFS
57 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
59 /* Default is to see 64-bit inode numbers */
60 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
62 static void nfs_invalidate_inode(struct inode *);
63 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
65 static struct kmem_cache * nfs_inode_cachep;
67 static inline unsigned long
68 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
70 return nfs_fileid_to_ino_t(fattr->fileid);
74 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
75 * @word: long word containing the bit lock
77 int nfs_wait_bit_killable(void *word)
79 if (fatal_signal_pending(current))
81 freezable_schedule_unsafe();
84 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
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 int nfs_drop_inode(struct inode *inode)
111 return NFS_STALE(inode) || generic_drop_inode(inode);
113 EXPORT_SYMBOL_GPL(nfs_drop_inode);
115 void nfs_clear_inode(struct inode *inode)
118 * The following should never happen...
120 WARN_ON_ONCE(nfs_have_writebacks(inode));
121 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
122 nfs_zap_acl_cache(inode);
123 nfs_access_zap_cache(inode);
124 nfs_fscache_release_inode_cookie(inode);
126 EXPORT_SYMBOL_GPL(nfs_clear_inode);
128 void nfs_evict_inode(struct inode *inode)
130 truncate_inode_pages(&inode->i_data, 0);
132 nfs_clear_inode(inode);
136 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
138 int nfs_sync_mapping(struct address_space *mapping)
142 if (mapping->nrpages != 0) {
143 unmap_mapping_range(mapping, 0, 0, 0);
144 ret = nfs_wb_all(mapping->host);
150 * Invalidate the local caches
152 static void nfs_zap_caches_locked(struct inode *inode)
154 struct nfs_inode *nfsi = NFS_I(inode);
155 int mode = inode->i_mode;
157 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
159 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
160 nfsi->attrtimeo_timestamp = jiffies;
162 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
163 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
164 nfs_fscache_invalidate(inode);
165 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
166 | NFS_INO_INVALID_LABEL
167 | NFS_INO_INVALID_DATA
168 | NFS_INO_INVALID_ACCESS
169 | NFS_INO_INVALID_ACL
170 | NFS_INO_REVAL_PAGECACHE;
172 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
173 | NFS_INO_INVALID_LABEL
174 | NFS_INO_INVALID_ACCESS
175 | NFS_INO_INVALID_ACL
176 | NFS_INO_REVAL_PAGECACHE;
179 void nfs_zap_caches(struct inode *inode)
181 spin_lock(&inode->i_lock);
182 nfs_zap_caches_locked(inode);
183 spin_unlock(&inode->i_lock);
186 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
188 if (mapping->nrpages != 0) {
189 spin_lock(&inode->i_lock);
190 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
191 nfs_fscache_invalidate(inode);
192 spin_unlock(&inode->i_lock);
196 void nfs_zap_acl_cache(struct inode *inode)
198 void (*clear_acl_cache)(struct inode *);
200 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
201 if (clear_acl_cache != NULL)
202 clear_acl_cache(inode);
203 spin_lock(&inode->i_lock);
204 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
205 spin_unlock(&inode->i_lock);
207 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
209 void nfs_invalidate_atime(struct inode *inode)
211 spin_lock(&inode->i_lock);
212 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
213 spin_unlock(&inode->i_lock);
215 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
218 * Invalidate, but do not unhash, the inode.
219 * NB: must be called with inode->i_lock held!
221 static void nfs_invalidate_inode(struct inode *inode)
223 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
224 nfs_zap_caches_locked(inode);
227 struct nfs_find_desc {
229 struct nfs_fattr *fattr;
233 * In NFSv3 we can have 64bit inode numbers. In order to support
234 * this, and re-exported directories (also seen in NFSv2)
235 * we are forced to allow 2 different inodes to have the same
239 nfs_find_actor(struct inode *inode, void *opaque)
241 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
242 struct nfs_fh *fh = desc->fh;
243 struct nfs_fattr *fattr = desc->fattr;
245 if (NFS_FILEID(inode) != fattr->fileid)
247 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
249 if (nfs_compare_fh(NFS_FH(inode), fh))
251 if (is_bad_inode(inode) || NFS_STALE(inode))
257 nfs_init_locked(struct inode *inode, void *opaque)
259 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
260 struct nfs_fattr *fattr = desc->fattr;
262 set_nfs_fileid(inode, fattr->fileid);
263 nfs_copy_fh(NFS_FH(inode), desc->fh);
267 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
268 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
269 struct nfs4_label *label)
276 if (nfs_server_capable(inode, NFS_CAP_SECURITY_LABEL) == 0)
279 if (NFS_SERVER(inode)->nfs_client->cl_minorversion < 2)
282 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
283 error = security_inode_notifysecctx(inode, label->label,
286 printk(KERN_ERR "%s() %s %d "
287 "security_inode_notifysecctx() %d\n",
289 (char *)label->label,
294 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
296 struct nfs4_label *label = NULL;
297 int minor_version = server->nfs_client->cl_minorversion;
299 if (minor_version < 2)
302 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
305 label = kzalloc(sizeof(struct nfs4_label), flags);
307 return ERR_PTR(-ENOMEM);
309 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
310 if (label->label == NULL) {
312 return ERR_PTR(-ENOMEM);
314 label->len = NFS4_MAXLABELLEN;
318 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
320 void inline nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
321 struct nfs4_label *label)
325 EXPORT_SYMBOL_GPL(nfs_setsecurity);
328 * This is our front-end to iget that looks up inodes by file handle
329 * instead of inode number.
332 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
334 struct nfs_find_desc desc = {
338 struct inode *inode = ERR_PTR(-ENOENT);
341 nfs_attr_check_mountpoint(sb, fattr);
343 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
344 !nfs_attr_use_mounted_on_fileid(fattr))
346 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
349 hash = nfs_fattr_to_ino_t(fattr);
351 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
353 inode = ERR_PTR(-ENOMEM);
357 if (inode->i_state & I_NEW) {
358 struct nfs_inode *nfsi = NFS_I(inode);
359 unsigned long now = jiffies;
361 /* We set i_ino for the few things that still rely on it,
365 /* We can't support update_atime(), since the server will reset it */
366 inode->i_flags |= S_NOATIME|S_NOCMTIME;
367 inode->i_mode = fattr->mode;
368 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
369 && nfs_server_capable(inode, NFS_CAP_MODE))
370 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
371 /* Why so? Because we want revalidate for devices/FIFOs, and
372 * that's precisely what we have in nfs_file_inode_operations.
374 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
375 if (S_ISREG(inode->i_mode)) {
376 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
377 inode->i_data.a_ops = &nfs_file_aops;
378 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
379 } else if (S_ISDIR(inode->i_mode)) {
380 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
381 inode->i_fop = &nfs_dir_operations;
382 inode->i_data.a_ops = &nfs_dir_aops;
383 /* Deal with crossing mountpoints */
384 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
385 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
386 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
387 inode->i_op = &nfs_referral_inode_operations;
389 inode->i_op = &nfs_mountpoint_inode_operations;
391 inode->i_flags |= S_AUTOMOUNT;
393 } else if (S_ISLNK(inode->i_mode))
394 inode->i_op = &nfs_symlink_inode_operations;
396 init_special_inode(inode, inode->i_mode, fattr->rdev);
398 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
399 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
400 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
401 inode->i_version = 0;
404 inode->i_uid = make_kuid(&init_user_ns, -2);
405 inode->i_gid = make_kgid(&init_user_ns, -2);
407 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
411 nfsi->read_cache_jiffies = fattr->time_start;
412 nfsi->attr_gencount = fattr->gencount;
413 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
414 inode->i_atime = fattr->atime;
415 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
416 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
417 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
418 inode->i_mtime = fattr->mtime;
419 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
420 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
421 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
422 inode->i_ctime = fattr->ctime;
423 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
424 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
425 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
426 inode->i_version = fattr->change_attr;
427 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
428 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
429 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
430 inode->i_size = nfs_size_to_loff_t(fattr->size);
432 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
433 | NFS_INO_REVAL_PAGECACHE;
434 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
435 set_nlink(inode, fattr->nlink);
436 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
437 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
438 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
439 inode->i_uid = fattr->uid;
440 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
441 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
442 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
443 inode->i_gid = fattr->gid;
444 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
445 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
446 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
447 inode->i_blocks = fattr->du.nfs2.blocks;
448 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
450 * report the blocks in 512byte units
452 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
455 nfs_setsecurity(inode, fattr, label);
457 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
458 nfsi->attrtimeo_timestamp = now;
459 nfsi->access_cache = RB_ROOT;
461 nfs_fscache_init_inode_cookie(inode);
463 unlock_new_inode(inode);
465 nfs_refresh_inode(inode, fattr);
466 nfs_setsecurity(inode, fattr, label);
467 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
469 (long long)NFS_FILEID(inode),
470 nfs_display_fhandle_hash(fh),
471 atomic_read(&inode->i_count));
477 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
480 EXPORT_SYMBOL_GPL(nfs_fhget);
482 #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)
485 nfs_setattr(struct dentry *dentry, struct iattr *attr)
487 struct inode *inode = dentry->d_inode;
488 struct nfs_fattr *fattr;
491 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
493 /* skip mode change if it's just for clearing setuid/setgid */
494 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
495 attr->ia_valid &= ~ATTR_MODE;
497 if (attr->ia_valid & ATTR_SIZE) {
498 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
499 attr->ia_valid &= ~ATTR_SIZE;
502 /* Optimization: if the end result is no change, don't RPC */
503 attr->ia_valid &= NFS_VALID_ATTRS;
504 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
507 /* Write all dirty data */
508 if (S_ISREG(inode->i_mode)) {
509 nfs_inode_dio_wait(inode);
513 fattr = nfs_alloc_fattr();
517 * Return any delegations if we're going to change ACLs
519 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
520 NFS_PROTO(inode)->return_delegation(inode);
521 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
523 error = nfs_refresh_inode(inode, fattr);
524 nfs_free_fattr(fattr);
528 EXPORT_SYMBOL_GPL(nfs_setattr);
531 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
532 * @inode: inode of the file used
533 * @offset: file offset to start truncating
535 * This is a copy of the common vmtruncate, but with the locking
536 * corrected to take into account the fact that NFS requires
537 * inode->i_size to be updated under the inode->i_lock.
539 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
544 err = inode_newsize_ok(inode, offset);
548 spin_lock(&inode->i_lock);
549 oldsize = inode->i_size;
550 i_size_write(inode, offset);
551 spin_unlock(&inode->i_lock);
553 truncate_pagecache(inode, oldsize, offset);
559 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
560 * @inode: pointer to struct inode
561 * @attr: pointer to struct iattr
563 * Note: we do this in the *proc.c in order to ensure that
564 * it works for things like exclusive creates too.
566 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
568 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
569 spin_lock(&inode->i_lock);
570 if ((attr->ia_valid & ATTR_MODE) != 0) {
571 int mode = attr->ia_mode & S_IALLUGO;
572 mode |= inode->i_mode & ~S_IALLUGO;
573 inode->i_mode = mode;
575 if ((attr->ia_valid & ATTR_UID) != 0)
576 inode->i_uid = attr->ia_uid;
577 if ((attr->ia_valid & ATTR_GID) != 0)
578 inode->i_gid = attr->ia_gid;
579 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
580 spin_unlock(&inode->i_lock);
582 if ((attr->ia_valid & ATTR_SIZE) != 0) {
583 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
584 nfs_vmtruncate(inode, attr->ia_size);
587 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
589 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
591 struct inode *inode = dentry->d_inode;
592 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
595 /* Flush out writes to the server in order to update c/mtime. */
596 if (S_ISREG(inode->i_mode)) {
597 nfs_inode_dio_wait(inode);
598 err = filemap_write_and_wait(inode->i_mapping);
604 * We may force a getattr if the user cares about atime.
606 * Note that we only have to check the vfsmount flags here:
607 * - NFS always sets S_NOATIME by so checking it would give a
609 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
610 * no point in checking those.
612 if ((mnt->mnt_flags & MNT_NOATIME) ||
613 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
617 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
619 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
621 generic_fillattr(inode, stat);
622 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
627 EXPORT_SYMBOL_GPL(nfs_getattr);
629 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
631 atomic_set(&l_ctx->count, 1);
632 l_ctx->lockowner.l_owner = current->files;
633 l_ctx->lockowner.l_pid = current->tgid;
634 INIT_LIST_HEAD(&l_ctx->list);
635 nfs_iocounter_init(&l_ctx->io_count);
638 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
640 struct nfs_lock_context *head = &ctx->lock_context;
641 struct nfs_lock_context *pos = head;
644 if (pos->lockowner.l_owner != current->files)
646 if (pos->lockowner.l_pid != current->tgid)
648 atomic_inc(&pos->count);
650 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
654 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
656 struct nfs_lock_context *res, *new = NULL;
657 struct inode *inode = ctx->dentry->d_inode;
659 spin_lock(&inode->i_lock);
660 res = __nfs_find_lock_context(ctx);
662 spin_unlock(&inode->i_lock);
663 new = kmalloc(sizeof(*new), GFP_KERNEL);
665 return ERR_PTR(-ENOMEM);
666 nfs_init_lock_context(new);
667 spin_lock(&inode->i_lock);
668 res = __nfs_find_lock_context(ctx);
670 list_add_tail(&new->list, &ctx->lock_context.list);
671 new->open_context = ctx;
676 spin_unlock(&inode->i_lock);
681 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
683 struct nfs_open_context *ctx = l_ctx->open_context;
684 struct inode *inode = ctx->dentry->d_inode;
686 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
688 list_del(&l_ctx->list);
689 spin_unlock(&inode->i_lock);
694 * nfs_close_context - Common close_context() routine NFSv2/v3
695 * @ctx: pointer to context
696 * @is_sync: is this a synchronous close
698 * always ensure that the attributes are up to date if we're mounted
699 * with close-to-open semantics
701 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
704 struct nfs_server *server;
706 if (!(ctx->mode & FMODE_WRITE))
710 inode = ctx->dentry->d_inode;
711 if (!list_empty(&NFS_I(inode)->open_files))
713 server = NFS_SERVER(inode);
714 if (server->flags & NFS_MOUNT_NOCTO)
716 nfs_revalidate_inode(server, inode);
718 EXPORT_SYMBOL_GPL(nfs_close_context);
720 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
722 struct nfs_open_context *ctx;
723 struct rpc_cred *cred = rpc_lookup_cred();
725 return ERR_CAST(cred);
727 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
730 return ERR_PTR(-ENOMEM);
732 nfs_sb_active(dentry->d_sb);
733 ctx->dentry = dget(dentry);
739 nfs_init_lock_context(&ctx->lock_context);
740 ctx->lock_context.open_context = ctx;
741 INIT_LIST_HEAD(&ctx->list);
742 ctx->mdsthreshold = NULL;
745 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
747 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
750 atomic_inc(&ctx->lock_context.count);
753 EXPORT_SYMBOL_GPL(get_nfs_open_context);
755 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
757 struct inode *inode = ctx->dentry->d_inode;
758 struct super_block *sb = ctx->dentry->d_sb;
760 if (!list_empty(&ctx->list)) {
761 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
763 list_del(&ctx->list);
764 spin_unlock(&inode->i_lock);
765 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
768 NFS_PROTO(inode)->close_context(ctx, is_sync);
769 if (ctx->cred != NULL)
770 put_rpccred(ctx->cred);
773 kfree(ctx->mdsthreshold);
777 void put_nfs_open_context(struct nfs_open_context *ctx)
779 __put_nfs_open_context(ctx, 0);
781 EXPORT_SYMBOL_GPL(put_nfs_open_context);
784 * Ensure that mmap has a recent RPC credential for use when writing out
787 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
789 struct inode *inode = ctx->dentry->d_inode;
790 struct nfs_inode *nfsi = NFS_I(inode);
792 spin_lock(&inode->i_lock);
793 list_add(&ctx->list, &nfsi->open_files);
794 spin_unlock(&inode->i_lock);
796 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
798 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
800 filp->private_data = get_nfs_open_context(ctx);
801 if (list_empty(&ctx->list))
802 nfs_inode_attach_open_context(ctx);
804 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
807 * Given an inode, search for an open context with the desired characteristics
809 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
811 struct nfs_inode *nfsi = NFS_I(inode);
812 struct nfs_open_context *pos, *ctx = NULL;
814 spin_lock(&inode->i_lock);
815 list_for_each_entry(pos, &nfsi->open_files, list) {
816 if (cred != NULL && pos->cred != cred)
818 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
820 ctx = get_nfs_open_context(pos);
823 spin_unlock(&inode->i_lock);
827 static void nfs_file_clear_open_context(struct file *filp)
829 struct nfs_open_context *ctx = nfs_file_open_context(filp);
832 struct inode *inode = ctx->dentry->d_inode;
834 filp->private_data = NULL;
835 spin_lock(&inode->i_lock);
836 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
837 spin_unlock(&inode->i_lock);
838 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
843 * These allocate and release file read/write context information.
845 int nfs_open(struct inode *inode, struct file *filp)
847 struct nfs_open_context *ctx;
849 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
852 nfs_file_set_open_context(filp, ctx);
853 put_nfs_open_context(ctx);
854 nfs_fscache_set_inode_cookie(inode, filp);
858 int nfs_release(struct inode *inode, struct file *filp)
860 nfs_file_clear_open_context(filp);
865 * This function is called whenever some part of NFS notices that
866 * the cached attributes have to be refreshed.
869 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
871 int status = -ESTALE;
872 struct nfs4_label *label = NULL;
873 struct nfs_fattr *fattr = NULL;
874 struct nfs_inode *nfsi = NFS_I(inode);
876 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
877 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
879 if (is_bad_inode(inode))
881 if (NFS_STALE(inode))
885 fattr = nfs_alloc_fattr();
889 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
891 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
893 status = PTR_ERR(label);
897 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
899 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
901 (long long)NFS_FILEID(inode), status);
902 if (status == -ESTALE) {
903 nfs_zap_caches(inode);
904 if (!S_ISDIR(inode->i_mode))
905 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
910 status = nfs_refresh_inode(inode, fattr);
912 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
914 (long long)NFS_FILEID(inode), status);
918 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
919 nfs_zap_acl_cache(inode);
921 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
923 (long long)NFS_FILEID(inode));
926 nfs4_label_free(label);
928 nfs_free_fattr(fattr);
932 int nfs_attribute_timeout(struct inode *inode)
934 struct nfs_inode *nfsi = NFS_I(inode);
936 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
939 int nfs_attribute_cache_expired(struct inode *inode)
941 if (nfs_have_delegated_attributes(inode))
943 return nfs_attribute_timeout(inode);
947 * nfs_revalidate_inode - Revalidate the inode attributes
948 * @server - pointer to nfs_server struct
949 * @inode - pointer to inode struct
951 * Updates inode attribute information by retrieving the data from the server.
953 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
955 if (!(NFS_I(inode)->cache_validity &
956 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
957 && !nfs_attribute_cache_expired(inode))
958 return NFS_STALE(inode) ? -ESTALE : 0;
959 return __nfs_revalidate_inode(server, inode);
961 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
963 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
965 struct nfs_inode *nfsi = NFS_I(inode);
968 if (mapping->nrpages != 0) {
969 if (S_ISREG(inode->i_mode)) {
970 ret = nfs_sync_mapping(mapping);
974 ret = invalidate_inode_pages2(mapping);
978 spin_lock(&inode->i_lock);
979 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
980 if (S_ISDIR(inode->i_mode))
981 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
982 spin_unlock(&inode->i_lock);
983 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
984 nfs_fscache_wait_on_invalidate(inode);
985 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
986 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
990 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
992 if (nfs_have_delegated_attributes(inode))
994 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
995 || nfs_attribute_timeout(inode)
1000 * nfs_revalidate_mapping - Revalidate the pagecache
1001 * @inode - pointer to host inode
1002 * @mapping - pointer to mapping
1004 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1006 struct nfs_inode *nfsi = NFS_I(inode);
1009 /* swapfiles are not supposed to be shared. */
1010 if (IS_SWAPFILE(inode))
1013 if (nfs_mapping_need_revalidate_inode(inode)) {
1014 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1018 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1019 ret = nfs_invalidate_mapping(inode, mapping);
1024 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1026 struct nfs_inode *nfsi = NFS_I(inode);
1027 unsigned long ret = 0;
1029 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1030 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1031 && inode->i_version == fattr->pre_change_attr) {
1032 inode->i_version = fattr->change_attr;
1033 if (S_ISDIR(inode->i_mode))
1034 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1035 ret |= NFS_INO_INVALID_ATTR;
1037 /* If we have atomic WCC data, we may update some attributes */
1038 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1039 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1040 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1041 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1042 ret |= NFS_INO_INVALID_ATTR;
1045 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1046 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1047 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1048 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1049 if (S_ISDIR(inode->i_mode))
1050 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1051 ret |= NFS_INO_INVALID_ATTR;
1053 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1054 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1055 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1056 && nfsi->npages == 0) {
1057 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1058 ret |= NFS_INO_INVALID_ATTR;
1061 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1062 nfs_fscache_invalidate(inode);
1068 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1069 * @inode - pointer to inode
1070 * @fattr - updated attributes
1072 * Verifies the attribute cache. If we have just changed the attributes,
1073 * so that fattr carries weak cache consistency data, then it may
1074 * also update the ctime/mtime/change_attribute.
1076 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1078 struct nfs_inode *nfsi = NFS_I(inode);
1079 loff_t cur_size, new_isize;
1080 unsigned long invalid = 0;
1083 if (nfs_have_delegated_attributes(inode))
1085 /* Has the inode gone and changed behind our back? */
1086 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1088 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1091 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1092 inode->i_version != fattr->change_attr)
1093 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1095 /* Verify a few of the more important attributes */
1096 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1097 invalid |= NFS_INO_INVALID_ATTR;
1099 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1100 cur_size = i_size_read(inode);
1101 new_isize = nfs_size_to_loff_t(fattr->size);
1102 if (cur_size != new_isize && nfsi->npages == 0)
1103 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1106 /* Have any file permissions changed? */
1107 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1108 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1109 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1110 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1111 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1112 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1114 /* Has the link count changed? */
1115 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1116 invalid |= NFS_INO_INVALID_ATTR;
1118 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1119 invalid |= NFS_INO_INVALID_ATIME;
1122 nfsi->cache_validity |= invalid;
1124 nfsi->read_cache_jiffies = fattr->time_start;
1128 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1130 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1132 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1135 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1137 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1139 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1142 static atomic_long_t nfs_attr_generation_counter;
1144 static unsigned long nfs_read_attr_generation_counter(void)
1146 return atomic_long_read(&nfs_attr_generation_counter);
1149 unsigned long nfs_inc_attr_generation_counter(void)
1151 return atomic_long_inc_return(&nfs_attr_generation_counter);
1154 void nfs_fattr_init(struct nfs_fattr *fattr)
1157 fattr->time_start = jiffies;
1158 fattr->gencount = nfs_inc_attr_generation_counter();
1159 fattr->owner_name = NULL;
1160 fattr->group_name = NULL;
1162 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1164 struct nfs_fattr *nfs_alloc_fattr(void)
1166 struct nfs_fattr *fattr;
1168 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1170 nfs_fattr_init(fattr);
1173 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1175 struct nfs_fh *nfs_alloc_fhandle(void)
1179 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1184 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1188 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1189 * in the same way that wireshark does
1193 * For debugging only.
1195 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1197 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1198 * not on the result */
1199 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1203 * _nfs_display_fhandle - display an NFS file handle on the console
1205 * @fh: file handle to display
1206 * @caption: display caption
1208 * For debugging only.
1210 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1214 if (fh == NULL || fh->size == 0) {
1215 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1219 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1220 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1221 for (i = 0; i < fh->size; i += 16) {
1222 __be32 *pos = (__be32 *)&fh->data[i];
1224 switch ((fh->size - i - 1) >> 2) {
1226 printk(KERN_DEFAULT " %08x\n",
1230 printk(KERN_DEFAULT " %08x %08x\n",
1231 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1234 printk(KERN_DEFAULT " %08x %08x %08x\n",
1235 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1236 be32_to_cpup(pos + 2));
1239 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1240 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1241 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1248 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1249 * @inode - pointer to inode
1250 * @fattr - attributes
1252 * Attempt to divine whether or not an RPC call reply carrying stale
1253 * attributes got scheduled after another call carrying updated ones.
1255 * To do so, the function first assumes that a more recent ctime means
1256 * that the attributes in fattr are newer, however it also attempt to
1257 * catch the case where ctime either didn't change, or went backwards
1258 * (if someone reset the clock on the server) by looking at whether
1259 * or not this RPC call was started after the inode was last updated.
1260 * Note also the check for wraparound of 'attr_gencount'
1262 * The function returns 'true' if it thinks the attributes in 'fattr' are
1263 * more recent than the ones cached in the inode.
1266 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1268 const struct nfs_inode *nfsi = NFS_I(inode);
1270 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1271 nfs_ctime_need_update(inode, fattr) ||
1272 nfs_size_need_update(inode, fattr) ||
1273 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1276 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1278 if (nfs_inode_attrs_need_update(inode, fattr))
1279 return nfs_update_inode(inode, fattr);
1280 return nfs_check_inode_attributes(inode, fattr);
1284 * nfs_refresh_inode - try to update the inode attribute cache
1285 * @inode - pointer to inode
1286 * @fattr - updated attributes
1288 * Check that an RPC call that returned attributes has not overlapped with
1289 * other recent updates of the inode metadata, then decide whether it is
1290 * safe to do a full update of the inode attributes, or whether just to
1291 * call nfs_check_inode_attributes.
1293 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1297 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1299 spin_lock(&inode->i_lock);
1300 status = nfs_refresh_inode_locked(inode, fattr);
1301 spin_unlock(&inode->i_lock);
1305 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1307 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1309 struct nfs_inode *nfsi = NFS_I(inode);
1311 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1312 if (S_ISDIR(inode->i_mode)) {
1313 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1314 nfs_fscache_invalidate(inode);
1316 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1318 return nfs_refresh_inode_locked(inode, fattr);
1322 * nfs_post_op_update_inode - try to update the inode attribute cache
1323 * @inode - pointer to inode
1324 * @fattr - updated attributes
1326 * After an operation that has changed the inode metadata, mark the
1327 * attribute cache as being invalid, then try to update it.
1329 * NB: if the server didn't return any post op attributes, this
1330 * function will force the retrieval of attributes before the next
1331 * NFS request. Thus it should be used only for operations that
1332 * are expected to change one or more attributes, to avoid
1333 * unnecessary NFS requests and trips through nfs_update_inode().
1335 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1339 spin_lock(&inode->i_lock);
1340 status = nfs_post_op_update_inode_locked(inode, fattr);
1341 spin_unlock(&inode->i_lock);
1345 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1348 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1349 * @inode - pointer to inode
1350 * @fattr - updated attributes
1352 * After an operation that has changed the inode metadata, mark the
1353 * attribute cache as being invalid, then try to update it. Fake up
1354 * weak cache consistency data, if none exist.
1356 * This function is mainly designed to be used by the ->write_done() functions.
1358 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1362 spin_lock(&inode->i_lock);
1363 /* Don't do a WCC update if these attributes are already stale */
1364 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1365 !nfs_inode_attrs_need_update(inode, fattr)) {
1366 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1367 | NFS_ATTR_FATTR_PRESIZE
1368 | NFS_ATTR_FATTR_PREMTIME
1369 | NFS_ATTR_FATTR_PRECTIME);
1372 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1373 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1374 fattr->pre_change_attr = inode->i_version;
1375 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1377 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1378 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1379 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1380 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1382 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1383 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1384 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1385 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1387 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1388 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1389 fattr->pre_size = i_size_read(inode);
1390 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1393 status = nfs_post_op_update_inode_locked(inode, fattr);
1394 spin_unlock(&inode->i_lock);
1397 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1400 * Many nfs protocol calls return the new file attributes after
1401 * an operation. Here we update the inode to reflect the state
1402 * of the server's inode.
1404 * This is a bit tricky because we have to make sure all dirty pages
1405 * have been sent off to the server before calling invalidate_inode_pages.
1406 * To make sure no other process adds more write requests while we try
1407 * our best to flush them, we make them sleep during the attribute refresh.
1409 * A very similar scenario holds for the dir cache.
1411 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1413 struct nfs_server *server;
1414 struct nfs_inode *nfsi = NFS_I(inode);
1415 loff_t cur_isize, new_isize;
1416 unsigned long invalid = 0;
1417 unsigned long now = jiffies;
1418 unsigned long save_cache_validity;
1420 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1421 __func__, inode->i_sb->s_id, inode->i_ino,
1422 nfs_display_fhandle_hash(NFS_FH(inode)),
1423 atomic_read(&inode->i_count), fattr->valid);
1425 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1426 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1427 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1428 NFS_SERVER(inode)->nfs_client->cl_hostname,
1429 inode->i_sb->s_id, (long long)nfsi->fileid,
1430 (long long)fattr->fileid);
1435 * Make sure the inode's type hasn't changed.
1437 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1439 * Big trouble! The inode has become a different object.
1441 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1442 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1446 server = NFS_SERVER(inode);
1447 /* Update the fsid? */
1448 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1449 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1450 !IS_AUTOMOUNT(inode))
1451 server->fsid = fattr->fsid;
1454 * Update the read time so we don't revalidate too often.
1456 nfsi->read_cache_jiffies = fattr->time_start;
1458 save_cache_validity = nfsi->cache_validity;
1459 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1460 | NFS_INO_INVALID_ATIME
1461 | NFS_INO_REVAL_FORCED
1462 | NFS_INO_REVAL_PAGECACHE);
1464 /* Do atomic weak cache consistency updates */
1465 invalid |= nfs_wcc_update_inode(inode, fattr);
1467 /* More cache consistency checks */
1468 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1469 if (inode->i_version != fattr->change_attr) {
1470 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1471 inode->i_sb->s_id, inode->i_ino);
1472 invalid |= NFS_INO_INVALID_ATTR
1473 | NFS_INO_INVALID_DATA
1474 | NFS_INO_INVALID_ACCESS
1475 | NFS_INO_INVALID_ACL
1476 | NFS_INO_REVAL_PAGECACHE;
1477 if (S_ISDIR(inode->i_mode))
1478 nfs_force_lookup_revalidate(inode);
1479 inode->i_version = fattr->change_attr;
1481 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1482 invalid |= save_cache_validity;
1484 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1485 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1486 } else if (server->caps & NFS_CAP_MTIME)
1487 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1488 | NFS_INO_REVAL_FORCED);
1490 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1491 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1492 } else if (server->caps & NFS_CAP_CTIME)
1493 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1494 | NFS_INO_REVAL_FORCED);
1496 /* Check if our cached file size is stale */
1497 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1498 new_isize = nfs_size_to_loff_t(fattr->size);
1499 cur_isize = i_size_read(inode);
1500 if (new_isize != cur_isize) {
1501 /* Do we perhaps have any outstanding writes, or has
1502 * the file grown beyond our last write? */
1503 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1504 new_isize > cur_isize) {
1505 i_size_write(inode, new_isize);
1506 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1508 dprintk("NFS: isize change on server for file %s/%ld "
1512 (long long)cur_isize,
1513 (long long)new_isize);
1516 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1517 | NFS_INO_REVAL_PAGECACHE
1518 | NFS_INO_REVAL_FORCED);
1521 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1522 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1523 else if (server->caps & NFS_CAP_ATIME)
1524 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1525 | NFS_INO_REVAL_FORCED);
1527 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1528 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1529 umode_t newmode = inode->i_mode & S_IFMT;
1530 newmode |= fattr->mode & S_IALLUGO;
1531 inode->i_mode = newmode;
1532 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1534 } else if (server->caps & NFS_CAP_MODE)
1535 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1536 | NFS_INO_INVALID_ACCESS
1537 | NFS_INO_INVALID_ACL
1538 | NFS_INO_REVAL_FORCED);
1540 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1541 if (!uid_eq(inode->i_uid, fattr->uid)) {
1542 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1543 inode->i_uid = fattr->uid;
1545 } else if (server->caps & NFS_CAP_OWNER)
1546 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1547 | NFS_INO_INVALID_ACCESS
1548 | NFS_INO_INVALID_ACL
1549 | NFS_INO_REVAL_FORCED);
1551 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1552 if (!gid_eq(inode->i_gid, fattr->gid)) {
1553 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1554 inode->i_gid = fattr->gid;
1556 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1557 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1558 | NFS_INO_INVALID_ACCESS
1559 | NFS_INO_INVALID_ACL
1560 | NFS_INO_REVAL_FORCED);
1562 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1563 if (inode->i_nlink != fattr->nlink) {
1564 invalid |= NFS_INO_INVALID_ATTR;
1565 if (S_ISDIR(inode->i_mode))
1566 invalid |= NFS_INO_INVALID_DATA;
1567 set_nlink(inode, fattr->nlink);
1569 } else if (server->caps & NFS_CAP_NLINK)
1570 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1571 | NFS_INO_REVAL_FORCED);
1573 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1575 * report the blocks in 512byte units
1577 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1579 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1580 inode->i_blocks = fattr->du.nfs2.blocks;
1582 /* Update attrtimeo value if we're out of the unstable period */
1583 if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) {
1584 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1585 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1586 nfsi->attrtimeo_timestamp = now;
1587 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1589 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1590 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1591 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1592 nfsi->attrtimeo_timestamp = now;
1595 invalid &= ~NFS_INO_INVALID_ATTR;
1596 invalid &= ~NFS_INO_INVALID_LABEL;
1597 /* Don't invalidate the data if we were to blame */
1598 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1599 || S_ISLNK(inode->i_mode)))
1600 invalid &= ~NFS_INO_INVALID_DATA;
1601 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1602 (save_cache_validity & NFS_INO_REVAL_FORCED))
1603 nfsi->cache_validity |= invalid;
1605 if (invalid & NFS_INO_INVALID_DATA)
1606 nfs_fscache_invalidate(inode);
1611 * No need to worry about unhashing the dentry, as the
1612 * lookup validation will know that the inode is bad.
1613 * (But we fall through to invalidate the caches.)
1615 nfs_invalidate_inode(inode);
1619 struct inode *nfs_alloc_inode(struct super_block *sb)
1621 struct nfs_inode *nfsi;
1622 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1626 nfsi->cache_validity = 0UL;
1627 #ifdef CONFIG_NFS_V3_ACL
1628 nfsi->acl_access = ERR_PTR(-EAGAIN);
1629 nfsi->acl_default = ERR_PTR(-EAGAIN);
1631 #if IS_ENABLED(CONFIG_NFS_V4)
1632 nfsi->nfs4_acl = NULL;
1633 #endif /* CONFIG_NFS_V4 */
1634 return &nfsi->vfs_inode;
1636 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1638 static void nfs_i_callback(struct rcu_head *head)
1640 struct inode *inode = container_of(head, struct inode, i_rcu);
1641 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1644 void nfs_destroy_inode(struct inode *inode)
1646 call_rcu(&inode->i_rcu, nfs_i_callback);
1648 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1650 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1652 #if IS_ENABLED(CONFIG_NFS_V4)
1653 INIT_LIST_HEAD(&nfsi->open_states);
1654 nfsi->delegation = NULL;
1655 nfsi->delegation_state = 0;
1656 init_rwsem(&nfsi->rwsem);
1657 nfsi->layout = NULL;
1661 static void init_once(void *foo)
1663 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1665 inode_init_once(&nfsi->vfs_inode);
1666 INIT_LIST_HEAD(&nfsi->open_files);
1667 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1668 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1669 INIT_LIST_HEAD(&nfsi->commit_info.list);
1671 nfsi->commit_info.ncommit = 0;
1672 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1673 atomic_set(&nfsi->silly_count, 1);
1674 INIT_HLIST_HEAD(&nfsi->silly_list);
1675 init_waitqueue_head(&nfsi->waitqueue);
1676 nfs4_init_once(nfsi);
1679 static int __init nfs_init_inodecache(void)
1681 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1682 sizeof(struct nfs_inode),
1683 0, (SLAB_RECLAIM_ACCOUNT|
1686 if (nfs_inode_cachep == NULL)
1692 static void nfs_destroy_inodecache(void)
1695 * Make sure all delayed rcu free inodes are flushed before we
1699 kmem_cache_destroy(nfs_inode_cachep);
1702 struct workqueue_struct *nfsiod_workqueue;
1703 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1706 * start up the nfsiod workqueue
1708 static int nfsiod_start(void)
1710 struct workqueue_struct *wq;
1711 dprintk("RPC: creating workqueue nfsiod\n");
1712 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1715 nfsiod_workqueue = wq;
1720 * Destroy the nfsiod workqueue
1722 static void nfsiod_stop(void)
1724 struct workqueue_struct *wq;
1726 wq = nfsiod_workqueue;
1729 nfsiod_workqueue = NULL;
1730 destroy_workqueue(wq);
1734 EXPORT_SYMBOL_GPL(nfs_net_id);
1736 static int nfs_net_init(struct net *net)
1738 nfs_clients_init(net);
1742 static void nfs_net_exit(struct net *net)
1744 nfs_cleanup_cb_ident_idr(net);
1747 static struct pernet_operations nfs_net_ops = {
1748 .init = nfs_net_init,
1749 .exit = nfs_net_exit,
1751 .size = sizeof(struct nfs_net),
1757 static int __init init_nfs_fs(void)
1761 err = register_pernet_subsys(&nfs_net_ops);
1765 err = nfs_fscache_register();
1769 err = nfsiod_start();
1773 err = nfs_fs_proc_init();
1777 err = nfs_init_nfspagecache();
1781 err = nfs_init_inodecache();
1785 err = nfs_init_readpagecache();
1789 err = nfs_init_writepagecache();
1793 err = nfs_init_directcache();
1797 #ifdef CONFIG_PROC_FS
1798 rpc_proc_register(&init_net, &nfs_rpcstat);
1800 if ((err = register_nfs_fs()) != 0)
1805 #ifdef CONFIG_PROC_FS
1806 rpc_proc_unregister(&init_net, "nfs");
1808 nfs_destroy_directcache();
1810 nfs_destroy_writepagecache();
1812 nfs_destroy_readpagecache();
1814 nfs_destroy_inodecache();
1816 nfs_destroy_nfspagecache();
1822 nfs_fscache_unregister();
1824 unregister_pernet_subsys(&nfs_net_ops);
1829 static void __exit exit_nfs_fs(void)
1831 nfs_destroy_directcache();
1832 nfs_destroy_writepagecache();
1833 nfs_destroy_readpagecache();
1834 nfs_destroy_inodecache();
1835 nfs_destroy_nfspagecache();
1836 nfs_fscache_unregister();
1837 unregister_pernet_subsys(&nfs_net_ops);
1838 #ifdef CONFIG_PROC_FS
1839 rpc_proc_unregister(&init_net, "nfs");
1841 unregister_nfs_fs();
1846 /* Not quite true; I just maintain it */
1847 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1848 MODULE_LICENSE("GPL");
1849 module_param(enable_ino64, bool, 0644);
1851 module_init(init_nfs_fs)
1852 module_exit(exit_nfs_fs)