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>
42 #include <asm/uaccess.h>
46 #include "delegation.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))
82 freezable_schedule_unsafe();
85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
88 * nfs_compat_user_ino64 - returns the user-visible inode number
89 * @fileid: 64-bit fileid
91 * This function returns a 32-bit inode number if the boot parameter
92 * nfs.enable_ino64 is zero.
94 u64 nfs_compat_user_ino64(u64 fileid)
105 if (sizeof(ino) < sizeof(fileid))
106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
110 int nfs_drop_inode(struct inode *inode)
112 return NFS_STALE(inode) || generic_drop_inode(inode);
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
116 void nfs_clear_inode(struct inode *inode)
119 * The following should never happen...
121 WARN_ON_ONCE(nfs_have_writebacks(inode));
122 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123 nfs_zap_acl_cache(inode);
124 nfs_access_zap_cache(inode);
125 nfs_fscache_clear_inode(inode);
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
129 void nfs_evict_inode(struct inode *inode)
131 truncate_inode_pages_final(&inode->i_data);
133 nfs_clear_inode(inode);
137 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
139 int nfs_sync_mapping(struct address_space *mapping)
143 if (mapping->nrpages != 0) {
144 unmap_mapping_range(mapping, 0, 0, 0);
145 ret = nfs_wb_all(mapping->host);
151 * Invalidate the local caches
153 static void nfs_zap_caches_locked(struct inode *inode)
155 struct nfs_inode *nfsi = NFS_I(inode);
156 int mode = inode->i_mode;
158 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
160 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
161 nfsi->attrtimeo_timestamp = jiffies;
163 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
164 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
165 nfs_fscache_invalidate(inode);
166 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
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_ACCESS
174 | NFS_INO_INVALID_ACL
175 | NFS_INO_REVAL_PAGECACHE;
176 nfs_zap_label_cache_locked(nfsi);
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 static void nfs_clear_label_invalid(struct inode *inode)
270 spin_lock(&inode->i_lock);
271 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
272 spin_unlock(&inode->i_lock);
275 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
276 struct nfs4_label *label)
283 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
284 error = security_inode_notifysecctx(inode, label->label,
287 printk(KERN_ERR "%s() %s %d "
288 "security_inode_notifysecctx() %d\n",
290 (char *)label->label,
292 nfs_clear_label_invalid(inode);
296 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
298 struct nfs4_label *label = NULL;
299 int minor_version = server->nfs_client->cl_minorversion;
301 if (minor_version < 2)
304 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
307 label = kzalloc(sizeof(struct nfs4_label), flags);
309 return ERR_PTR(-ENOMEM);
311 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
312 if (label->label == NULL) {
314 return ERR_PTR(-ENOMEM);
316 label->len = NFS4_MAXLABELLEN;
320 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
322 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
323 struct nfs4_label *label)
327 EXPORT_SYMBOL_GPL(nfs_setsecurity);
330 * This is our front-end to iget that looks up inodes by file handle
331 * instead of inode number.
334 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
336 struct nfs_find_desc desc = {
340 struct inode *inode = ERR_PTR(-ENOENT);
343 nfs_attr_check_mountpoint(sb, fattr);
345 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
346 !nfs_attr_use_mounted_on_fileid(fattr))
348 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
351 hash = nfs_fattr_to_ino_t(fattr);
353 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
355 inode = ERR_PTR(-ENOMEM);
359 if (inode->i_state & I_NEW) {
360 struct nfs_inode *nfsi = NFS_I(inode);
361 unsigned long now = jiffies;
363 /* We set i_ino for the few things that still rely on it,
367 /* We can't support update_atime(), since the server will reset it */
368 inode->i_flags |= S_NOATIME|S_NOCMTIME;
369 inode->i_mode = fattr->mode;
370 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
371 && nfs_server_capable(inode, NFS_CAP_MODE))
372 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
373 /* Why so? Because we want revalidate for devices/FIFOs, and
374 * that's precisely what we have in nfs_file_inode_operations.
376 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
377 if (S_ISREG(inode->i_mode)) {
378 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
379 inode->i_data.a_ops = &nfs_file_aops;
380 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
381 } else if (S_ISDIR(inode->i_mode)) {
382 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
383 inode->i_fop = &nfs_dir_operations;
384 inode->i_data.a_ops = &nfs_dir_aops;
385 /* Deal with crossing mountpoints */
386 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
387 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
388 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
389 inode->i_op = &nfs_referral_inode_operations;
391 inode->i_op = &nfs_mountpoint_inode_operations;
393 inode->i_flags |= S_AUTOMOUNT;
395 } else if (S_ISLNK(inode->i_mode))
396 inode->i_op = &nfs_symlink_inode_operations;
398 init_special_inode(inode, inode->i_mode, fattr->rdev);
400 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
401 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
402 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
403 inode->i_version = 0;
406 inode->i_uid = make_kuid(&init_user_ns, -2);
407 inode->i_gid = make_kgid(&init_user_ns, -2);
409 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
413 nfsi->read_cache_jiffies = fattr->time_start;
414 nfsi->attr_gencount = fattr->gencount;
415 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
416 inode->i_atime = fattr->atime;
417 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
418 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
419 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
420 inode->i_mtime = fattr->mtime;
421 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
422 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
423 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
424 inode->i_ctime = fattr->ctime;
425 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
426 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
427 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
428 inode->i_version = fattr->change_attr;
429 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
430 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
431 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
432 inode->i_size = nfs_size_to_loff_t(fattr->size);
434 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
435 | NFS_INO_REVAL_PAGECACHE;
436 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
437 set_nlink(inode, fattr->nlink);
438 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
439 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
440 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
441 inode->i_uid = fattr->uid;
442 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
443 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
444 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
445 inode->i_gid = fattr->gid;
446 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
447 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
448 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
449 inode->i_blocks = fattr->du.nfs2.blocks;
450 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
452 * report the blocks in 512byte units
454 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
457 nfs_setsecurity(inode, fattr, label);
459 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
460 nfsi->attrtimeo_timestamp = now;
461 nfsi->access_cache = RB_ROOT;
463 nfs_fscache_init_inode(inode);
465 unlock_new_inode(inode);
467 nfs_refresh_inode(inode, fattr);
468 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
470 (unsigned long long)NFS_FILEID(inode),
471 nfs_display_fhandle_hash(fh),
472 atomic_read(&inode->i_count));
478 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
481 EXPORT_SYMBOL_GPL(nfs_fhget);
483 #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)
486 nfs_setattr(struct dentry *dentry, struct iattr *attr)
488 struct inode *inode = dentry->d_inode;
489 struct nfs_fattr *fattr;
492 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
494 /* skip mode change if it's just for clearing setuid/setgid */
495 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
496 attr->ia_valid &= ~ATTR_MODE;
498 if (attr->ia_valid & ATTR_SIZE) {
499 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
500 attr->ia_valid &= ~ATTR_SIZE;
503 /* Optimization: if the end result is no change, don't RPC */
504 attr->ia_valid &= NFS_VALID_ATTRS;
505 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
508 trace_nfs_setattr_enter(inode);
510 /* Write all dirty data */
511 if (S_ISREG(inode->i_mode)) {
512 nfs_inode_dio_wait(inode);
516 fattr = nfs_alloc_fattr();
520 * Return any delegations if we're going to change ACLs
522 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
523 NFS_PROTO(inode)->return_delegation(inode);
524 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
526 error = nfs_refresh_inode(inode, fattr);
527 nfs_free_fattr(fattr);
529 trace_nfs_setattr_exit(inode, error);
532 EXPORT_SYMBOL_GPL(nfs_setattr);
535 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
536 * @inode: inode of the file used
537 * @offset: file offset to start truncating
539 * This is a copy of the common vmtruncate, but with the locking
540 * corrected to take into account the fact that NFS requires
541 * inode->i_size to be updated under the inode->i_lock.
543 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
547 err = inode_newsize_ok(inode, offset);
551 spin_lock(&inode->i_lock);
552 i_size_write(inode, offset);
553 spin_unlock(&inode->i_lock);
555 truncate_pagecache(inode, offset);
561 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
562 * @inode: pointer to struct inode
563 * @attr: pointer to struct iattr
565 * Note: we do this in the *proc.c in order to ensure that
566 * it works for things like exclusive creates too.
568 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
570 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
571 spin_lock(&inode->i_lock);
572 if ((attr->ia_valid & ATTR_MODE) != 0) {
573 int mode = attr->ia_mode & S_IALLUGO;
574 mode |= inode->i_mode & ~S_IALLUGO;
575 inode->i_mode = mode;
577 if ((attr->ia_valid & ATTR_UID) != 0)
578 inode->i_uid = attr->ia_uid;
579 if ((attr->ia_valid & ATTR_GID) != 0)
580 inode->i_gid = attr->ia_gid;
581 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
582 spin_unlock(&inode->i_lock);
584 if ((attr->ia_valid & ATTR_SIZE) != 0) {
585 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
586 nfs_vmtruncate(inode, attr->ia_size);
589 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
591 static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
593 struct dentry *parent;
595 parent = dget_parent(dentry);
596 nfs_force_use_readdirplus(parent->d_inode);
600 static bool nfs_need_revalidate_inode(struct inode *inode)
602 if (NFS_I(inode)->cache_validity &
603 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
605 if (nfs_attribute_cache_expired(inode))
610 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
612 struct inode *inode = dentry->d_inode;
613 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
616 trace_nfs_getattr_enter(inode);
617 /* Flush out writes to the server in order to update c/mtime. */
618 if (S_ISREG(inode->i_mode)) {
619 nfs_inode_dio_wait(inode);
620 err = filemap_write_and_wait(inode->i_mapping);
626 * We may force a getattr if the user cares about atime.
628 * Note that we only have to check the vfsmount flags here:
629 * - NFS always sets S_NOATIME by so checking it would give a
631 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
632 * no point in checking those.
634 if ((mnt->mnt_flags & MNT_NOATIME) ||
635 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
638 if (need_atime || nfs_need_revalidate_inode(inode)) {
639 struct nfs_server *server = NFS_SERVER(inode);
641 if (server->caps & NFS_CAP_READDIRPLUS)
642 nfs_request_parent_use_readdirplus(dentry);
643 err = __nfs_revalidate_inode(server, inode);
646 generic_fillattr(inode, stat);
647 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
650 trace_nfs_getattr_exit(inode, err);
653 EXPORT_SYMBOL_GPL(nfs_getattr);
655 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
657 atomic_set(&l_ctx->count, 1);
658 l_ctx->lockowner.l_owner = current->files;
659 l_ctx->lockowner.l_pid = current->tgid;
660 INIT_LIST_HEAD(&l_ctx->list);
661 nfs_iocounter_init(&l_ctx->io_count);
664 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
666 struct nfs_lock_context *head = &ctx->lock_context;
667 struct nfs_lock_context *pos = head;
670 if (pos->lockowner.l_owner != current->files)
672 if (pos->lockowner.l_pid != current->tgid)
674 atomic_inc(&pos->count);
676 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
680 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
682 struct nfs_lock_context *res, *new = NULL;
683 struct inode *inode = ctx->dentry->d_inode;
685 spin_lock(&inode->i_lock);
686 res = __nfs_find_lock_context(ctx);
688 spin_unlock(&inode->i_lock);
689 new = kmalloc(sizeof(*new), GFP_KERNEL);
691 return ERR_PTR(-ENOMEM);
692 nfs_init_lock_context(new);
693 spin_lock(&inode->i_lock);
694 res = __nfs_find_lock_context(ctx);
696 list_add_tail(&new->list, &ctx->lock_context.list);
697 new->open_context = ctx;
702 spin_unlock(&inode->i_lock);
707 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
709 struct nfs_open_context *ctx = l_ctx->open_context;
710 struct inode *inode = ctx->dentry->d_inode;
712 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
714 list_del(&l_ctx->list);
715 spin_unlock(&inode->i_lock);
720 * nfs_close_context - Common close_context() routine NFSv2/v3
721 * @ctx: pointer to context
722 * @is_sync: is this a synchronous close
724 * always ensure that the attributes are up to date if we're mounted
725 * with close-to-open semantics
727 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
730 struct nfs_server *server;
732 if (!(ctx->mode & FMODE_WRITE))
736 inode = ctx->dentry->d_inode;
737 if (!list_empty(&NFS_I(inode)->open_files))
739 server = NFS_SERVER(inode);
740 if (server->flags & NFS_MOUNT_NOCTO)
742 nfs_revalidate_inode(server, inode);
744 EXPORT_SYMBOL_GPL(nfs_close_context);
746 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
748 struct nfs_open_context *ctx;
749 struct rpc_cred *cred = rpc_lookup_cred();
751 return ERR_CAST(cred);
753 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
756 return ERR_PTR(-ENOMEM);
758 nfs_sb_active(dentry->d_sb);
759 ctx->dentry = dget(dentry);
765 nfs_init_lock_context(&ctx->lock_context);
766 ctx->lock_context.open_context = ctx;
767 INIT_LIST_HEAD(&ctx->list);
768 ctx->mdsthreshold = NULL;
771 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
773 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
776 atomic_inc(&ctx->lock_context.count);
779 EXPORT_SYMBOL_GPL(get_nfs_open_context);
781 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
783 struct inode *inode = ctx->dentry->d_inode;
784 struct super_block *sb = ctx->dentry->d_sb;
786 if (!list_empty(&ctx->list)) {
787 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
789 list_del(&ctx->list);
790 spin_unlock(&inode->i_lock);
791 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
794 NFS_PROTO(inode)->close_context(ctx, is_sync);
795 if (ctx->cred != NULL)
796 put_rpccred(ctx->cred);
799 kfree(ctx->mdsthreshold);
803 void put_nfs_open_context(struct nfs_open_context *ctx)
805 __put_nfs_open_context(ctx, 0);
807 EXPORT_SYMBOL_GPL(put_nfs_open_context);
810 * Ensure that mmap has a recent RPC credential for use when writing out
813 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
815 struct inode *inode = ctx->dentry->d_inode;
816 struct nfs_inode *nfsi = NFS_I(inode);
818 spin_lock(&inode->i_lock);
819 list_add(&ctx->list, &nfsi->open_files);
820 spin_unlock(&inode->i_lock);
822 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
824 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
826 filp->private_data = get_nfs_open_context(ctx);
827 if (list_empty(&ctx->list))
828 nfs_inode_attach_open_context(ctx);
830 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
833 * Given an inode, search for an open context with the desired characteristics
835 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
837 struct nfs_inode *nfsi = NFS_I(inode);
838 struct nfs_open_context *pos, *ctx = NULL;
840 spin_lock(&inode->i_lock);
841 list_for_each_entry(pos, &nfsi->open_files, list) {
842 if (cred != NULL && pos->cred != cred)
844 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
846 ctx = get_nfs_open_context(pos);
849 spin_unlock(&inode->i_lock);
853 static void nfs_file_clear_open_context(struct file *filp)
855 struct nfs_open_context *ctx = nfs_file_open_context(filp);
858 struct inode *inode = ctx->dentry->d_inode;
860 filp->private_data = NULL;
861 spin_lock(&inode->i_lock);
862 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
863 spin_unlock(&inode->i_lock);
864 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
869 * These allocate and release file read/write context information.
871 int nfs_open(struct inode *inode, struct file *filp)
873 struct nfs_open_context *ctx;
875 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
878 nfs_file_set_open_context(filp, ctx);
879 put_nfs_open_context(ctx);
880 nfs_fscache_open_file(inode, filp);
884 int nfs_release(struct inode *inode, struct file *filp)
886 nfs_file_clear_open_context(filp);
891 * This function is called whenever some part of NFS notices that
892 * the cached attributes have to be refreshed.
895 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
897 int status = -ESTALE;
898 struct nfs4_label *label = NULL;
899 struct nfs_fattr *fattr = NULL;
900 struct nfs_inode *nfsi = NFS_I(inode);
902 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
903 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
905 trace_nfs_revalidate_inode_enter(inode);
907 if (is_bad_inode(inode))
909 if (NFS_STALE(inode))
913 fattr = nfs_alloc_fattr();
917 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
919 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
921 status = PTR_ERR(label);
925 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
927 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
929 (unsigned long long)NFS_FILEID(inode), status);
930 if (status == -ESTALE) {
931 nfs_zap_caches(inode);
932 if (!S_ISDIR(inode->i_mode))
933 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
938 status = nfs_refresh_inode(inode, fattr);
940 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
942 (unsigned long long)NFS_FILEID(inode), status);
946 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
947 nfs_zap_acl_cache(inode);
949 nfs_setsecurity(inode, fattr, label);
951 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
953 (unsigned long long)NFS_FILEID(inode));
956 nfs4_label_free(label);
958 nfs_free_fattr(fattr);
959 trace_nfs_revalidate_inode_exit(inode, status);
963 int nfs_attribute_timeout(struct inode *inode)
965 struct nfs_inode *nfsi = NFS_I(inode);
967 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
970 int nfs_attribute_cache_expired(struct inode *inode)
972 if (nfs_have_delegated_attributes(inode))
974 return nfs_attribute_timeout(inode);
978 * nfs_revalidate_inode - Revalidate the inode attributes
979 * @server - pointer to nfs_server struct
980 * @inode - pointer to inode struct
982 * Updates inode attribute information by retrieving the data from the server.
984 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
986 if (!nfs_need_revalidate_inode(inode))
987 return NFS_STALE(inode) ? -ESTALE : 0;
988 return __nfs_revalidate_inode(server, inode);
990 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
992 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
994 struct nfs_inode *nfsi = NFS_I(inode);
997 if (mapping->nrpages != 0) {
998 if (S_ISREG(inode->i_mode)) {
999 ret = nfs_sync_mapping(mapping);
1003 ret = invalidate_inode_pages2(mapping);
1007 if (S_ISDIR(inode->i_mode)) {
1008 spin_lock(&inode->i_lock);
1009 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1010 spin_unlock(&inode->i_lock);
1012 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1013 nfs_fscache_wait_on_invalidate(inode);
1015 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1017 (unsigned long long)NFS_FILEID(inode));
1021 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1023 if (nfs_have_delegated_attributes(inode))
1025 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1026 || nfs_attribute_timeout(inode)
1027 || NFS_STALE(inode);
1031 * nfs_revalidate_mapping - Revalidate the pagecache
1032 * @inode - pointer to host inode
1033 * @mapping - pointer to mapping
1035 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1037 struct nfs_inode *nfsi = NFS_I(inode);
1038 unsigned long *bitlock = &nfsi->flags;
1041 /* swapfiles are not supposed to be shared. */
1042 if (IS_SWAPFILE(inode))
1045 if (nfs_mapping_need_revalidate_inode(inode)) {
1046 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1052 * We must clear NFS_INO_INVALID_DATA first to ensure that
1053 * invalidations that come in while we're shooting down the mappings
1054 * are respected. But, that leaves a race window where one revalidator
1055 * can clear the flag, and then another checks it before the mapping
1056 * gets invalidated. Fix that by serializing access to this part of
1059 * At the same time, we need to allow other tasks to see whether we
1060 * might be in the middle of invalidating the pages, so we only set
1061 * the bit lock here if it looks like we're going to be doing that.
1064 ret = wait_on_bit(bitlock, NFS_INO_INVALIDATING,
1065 nfs_wait_bit_killable, TASK_KILLABLE);
1068 spin_lock(&inode->i_lock);
1069 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1070 spin_unlock(&inode->i_lock);
1073 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1075 spin_unlock(&inode->i_lock);
1079 set_bit(NFS_INO_INVALIDATING, bitlock);
1081 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1082 spin_unlock(&inode->i_lock);
1083 trace_nfs_invalidate_mapping_enter(inode);
1084 ret = nfs_invalidate_mapping(inode, mapping);
1085 trace_nfs_invalidate_mapping_exit(inode, ret);
1087 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1088 smp_mb__after_atomic();
1089 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1094 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1096 struct nfs_inode *nfsi = NFS_I(inode);
1097 unsigned long ret = 0;
1099 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1100 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1101 && inode->i_version == fattr->pre_change_attr) {
1102 inode->i_version = fattr->change_attr;
1103 if (S_ISDIR(inode->i_mode))
1104 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1105 ret |= NFS_INO_INVALID_ATTR;
1107 /* If we have atomic WCC data, we may update some attributes */
1108 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1109 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1110 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1111 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1112 ret |= NFS_INO_INVALID_ATTR;
1115 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1116 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1117 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1118 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1119 if (S_ISDIR(inode->i_mode))
1120 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1121 ret |= NFS_INO_INVALID_ATTR;
1123 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1124 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1125 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1126 && nfsi->npages == 0) {
1127 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1128 ret |= NFS_INO_INVALID_ATTR;
1131 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1132 nfs_fscache_invalidate(inode);
1138 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1139 * @inode - pointer to inode
1140 * @fattr - updated attributes
1142 * Verifies the attribute cache. If we have just changed the attributes,
1143 * so that fattr carries weak cache consistency data, then it may
1144 * also update the ctime/mtime/change_attribute.
1146 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1148 struct nfs_inode *nfsi = NFS_I(inode);
1149 loff_t cur_size, new_isize;
1150 unsigned long invalid = 0;
1153 if (nfs_have_delegated_attributes(inode))
1155 /* Has the inode gone and changed behind our back? */
1156 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1158 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1161 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1162 inode->i_version != fattr->change_attr)
1163 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1165 /* Verify a few of the more important attributes */
1166 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1167 invalid |= NFS_INO_INVALID_ATTR;
1169 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1170 cur_size = i_size_read(inode);
1171 new_isize = nfs_size_to_loff_t(fattr->size);
1172 if (cur_size != new_isize && nfsi->npages == 0)
1173 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1176 /* Have any file permissions changed? */
1177 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1178 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1179 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1180 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1181 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1182 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1184 /* Has the link count changed? */
1185 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1186 invalid |= NFS_INO_INVALID_ATTR;
1188 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1189 invalid |= NFS_INO_INVALID_ATIME;
1192 nfsi->cache_validity |= invalid;
1194 nfsi->read_cache_jiffies = fattr->time_start;
1198 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1200 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1202 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1205 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1207 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1209 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1212 static atomic_long_t nfs_attr_generation_counter;
1214 static unsigned long nfs_read_attr_generation_counter(void)
1216 return atomic_long_read(&nfs_attr_generation_counter);
1219 unsigned long nfs_inc_attr_generation_counter(void)
1221 return atomic_long_inc_return(&nfs_attr_generation_counter);
1224 void nfs_fattr_init(struct nfs_fattr *fattr)
1227 fattr->time_start = jiffies;
1228 fattr->gencount = nfs_inc_attr_generation_counter();
1229 fattr->owner_name = NULL;
1230 fattr->group_name = NULL;
1232 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1234 struct nfs_fattr *nfs_alloc_fattr(void)
1236 struct nfs_fattr *fattr;
1238 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1240 nfs_fattr_init(fattr);
1243 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1245 struct nfs_fh *nfs_alloc_fhandle(void)
1249 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1254 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1258 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1259 * in the same way that wireshark does
1263 * For debugging only.
1265 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1267 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1268 * not on the result */
1269 return nfs_fhandle_hash(fh);
1271 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1274 * _nfs_display_fhandle - display an NFS file handle on the console
1276 * @fh: file handle to display
1277 * @caption: display caption
1279 * For debugging only.
1281 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1285 if (fh == NULL || fh->size == 0) {
1286 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1290 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1291 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1292 for (i = 0; i < fh->size; i += 16) {
1293 __be32 *pos = (__be32 *)&fh->data[i];
1295 switch ((fh->size - i - 1) >> 2) {
1297 printk(KERN_DEFAULT " %08x\n",
1301 printk(KERN_DEFAULT " %08x %08x\n",
1302 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1305 printk(KERN_DEFAULT " %08x %08x %08x\n",
1306 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1307 be32_to_cpup(pos + 2));
1310 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1311 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1312 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1316 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1320 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1321 * @inode - pointer to inode
1322 * @fattr - attributes
1324 * Attempt to divine whether or not an RPC call reply carrying stale
1325 * attributes got scheduled after another call carrying updated ones.
1327 * To do so, the function first assumes that a more recent ctime means
1328 * that the attributes in fattr are newer, however it also attempt to
1329 * catch the case where ctime either didn't change, or went backwards
1330 * (if someone reset the clock on the server) by looking at whether
1331 * or not this RPC call was started after the inode was last updated.
1332 * Note also the check for wraparound of 'attr_gencount'
1334 * The function returns 'true' if it thinks the attributes in 'fattr' are
1335 * more recent than the ones cached in the inode.
1338 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1340 const struct nfs_inode *nfsi = NFS_I(inode);
1342 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1343 nfs_ctime_need_update(inode, fattr) ||
1344 nfs_size_need_update(inode, fattr) ||
1345 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1349 * Don't trust the change_attribute, mtime, ctime or size if
1350 * a pnfs LAYOUTCOMMIT is outstanding
1352 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1353 struct nfs_fattr *fattr)
1355 if (pnfs_layoutcommit_outstanding(inode))
1356 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1357 NFS_ATTR_FATTR_MTIME |
1358 NFS_ATTR_FATTR_CTIME |
1359 NFS_ATTR_FATTR_SIZE);
1362 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1366 trace_nfs_refresh_inode_enter(inode);
1368 nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1370 if (nfs_inode_attrs_need_update(inode, fattr))
1371 ret = nfs_update_inode(inode, fattr);
1373 ret = nfs_check_inode_attributes(inode, fattr);
1375 trace_nfs_refresh_inode_exit(inode, ret);
1380 * nfs_refresh_inode - try to update the inode attribute cache
1381 * @inode - pointer to inode
1382 * @fattr - updated attributes
1384 * Check that an RPC call that returned attributes has not overlapped with
1385 * other recent updates of the inode metadata, then decide whether it is
1386 * safe to do a full update of the inode attributes, or whether just to
1387 * call nfs_check_inode_attributes.
1389 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1393 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1395 spin_lock(&inode->i_lock);
1396 status = nfs_refresh_inode_locked(inode, fattr);
1397 spin_unlock(&inode->i_lock);
1401 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1403 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1405 struct nfs_inode *nfsi = NFS_I(inode);
1407 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1408 if (S_ISDIR(inode->i_mode)) {
1409 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1410 nfs_fscache_invalidate(inode);
1412 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1414 return nfs_refresh_inode_locked(inode, fattr);
1418 * nfs_post_op_update_inode - try to update the inode attribute cache
1419 * @inode - pointer to inode
1420 * @fattr - updated attributes
1422 * After an operation that has changed the inode metadata, mark the
1423 * attribute cache as being invalid, then try to update it.
1425 * NB: if the server didn't return any post op attributes, this
1426 * function will force the retrieval of attributes before the next
1427 * NFS request. Thus it should be used only for operations that
1428 * are expected to change one or more attributes, to avoid
1429 * unnecessary NFS requests and trips through nfs_update_inode().
1431 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1435 spin_lock(&inode->i_lock);
1436 status = nfs_post_op_update_inode_locked(inode, fattr);
1437 spin_unlock(&inode->i_lock);
1441 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1444 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1445 * @inode - pointer to inode
1446 * @fattr - updated attributes
1448 * After an operation that has changed the inode metadata, mark the
1449 * attribute cache as being invalid, then try to update it. Fake up
1450 * weak cache consistency data, if none exist.
1452 * This function is mainly designed to be used by the ->write_done() functions.
1454 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1458 spin_lock(&inode->i_lock);
1459 /* Don't do a WCC update if these attributes are already stale */
1460 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1461 !nfs_inode_attrs_need_update(inode, fattr)) {
1462 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1463 | NFS_ATTR_FATTR_PRESIZE
1464 | NFS_ATTR_FATTR_PREMTIME
1465 | NFS_ATTR_FATTR_PRECTIME);
1468 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1469 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1470 fattr->pre_change_attr = inode->i_version;
1471 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1473 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1474 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1475 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1476 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1478 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1479 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1480 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1481 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1483 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1484 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1485 fattr->pre_size = i_size_read(inode);
1486 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1489 status = nfs_post_op_update_inode_locked(inode, fattr);
1490 spin_unlock(&inode->i_lock);
1493 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1496 * Many nfs protocol calls return the new file attributes after
1497 * an operation. Here we update the inode to reflect the state
1498 * of the server's inode.
1500 * This is a bit tricky because we have to make sure all dirty pages
1501 * have been sent off to the server before calling invalidate_inode_pages.
1502 * To make sure no other process adds more write requests while we try
1503 * our best to flush them, we make them sleep during the attribute refresh.
1505 * A very similar scenario holds for the dir cache.
1507 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1509 struct nfs_server *server;
1510 struct nfs_inode *nfsi = NFS_I(inode);
1511 loff_t cur_isize, new_isize;
1512 unsigned long invalid = 0;
1513 unsigned long now = jiffies;
1514 unsigned long save_cache_validity;
1516 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1517 __func__, inode->i_sb->s_id, inode->i_ino,
1518 nfs_display_fhandle_hash(NFS_FH(inode)),
1519 atomic_read(&inode->i_count), fattr->valid);
1521 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1522 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1523 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1524 NFS_SERVER(inode)->nfs_client->cl_hostname,
1525 inode->i_sb->s_id, (long long)nfsi->fileid,
1526 (long long)fattr->fileid);
1531 * Make sure the inode's type hasn't changed.
1533 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1535 * Big trouble! The inode has become a different object.
1537 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1538 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1542 server = NFS_SERVER(inode);
1543 /* Update the fsid? */
1544 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1545 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1546 !IS_AUTOMOUNT(inode))
1547 server->fsid = fattr->fsid;
1550 * Update the read time so we don't revalidate too often.
1552 nfsi->read_cache_jiffies = fattr->time_start;
1554 save_cache_validity = nfsi->cache_validity;
1555 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1556 | NFS_INO_INVALID_ATIME
1557 | NFS_INO_REVAL_FORCED
1558 | NFS_INO_REVAL_PAGECACHE);
1560 /* Do atomic weak cache consistency updates */
1561 invalid |= nfs_wcc_update_inode(inode, fattr);
1563 /* More cache consistency checks */
1564 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1565 if (inode->i_version != fattr->change_attr) {
1566 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1567 inode->i_sb->s_id, inode->i_ino);
1568 invalid |= NFS_INO_INVALID_ATTR
1569 | NFS_INO_INVALID_DATA
1570 | NFS_INO_INVALID_ACCESS
1571 | NFS_INO_INVALID_ACL
1572 | NFS_INO_REVAL_PAGECACHE;
1573 if (S_ISDIR(inode->i_mode))
1574 nfs_force_lookup_revalidate(inode);
1575 inode->i_version = fattr->change_attr;
1577 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1578 nfsi->cache_validity |= save_cache_validity;
1580 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1581 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1582 } else if (server->caps & NFS_CAP_MTIME)
1583 nfsi->cache_validity |= save_cache_validity &
1584 (NFS_INO_INVALID_ATTR
1585 | NFS_INO_REVAL_FORCED);
1587 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1588 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1589 } else if (server->caps & NFS_CAP_CTIME)
1590 nfsi->cache_validity |= save_cache_validity &
1591 (NFS_INO_INVALID_ATTR
1592 | NFS_INO_REVAL_FORCED);
1594 /* Check if our cached file size is stale */
1595 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1596 new_isize = nfs_size_to_loff_t(fattr->size);
1597 cur_isize = i_size_read(inode);
1598 if (new_isize != cur_isize) {
1599 /* Do we perhaps have any outstanding writes, or has
1600 * the file grown beyond our last write? */
1601 if ((nfsi->npages == 0) || new_isize > cur_isize) {
1602 i_size_write(inode, new_isize);
1603 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1605 dprintk("NFS: isize change on server for file %s/%ld "
1609 (long long)cur_isize,
1610 (long long)new_isize);
1613 nfsi->cache_validity |= save_cache_validity &
1614 (NFS_INO_INVALID_ATTR
1615 | NFS_INO_REVAL_PAGECACHE
1616 | NFS_INO_REVAL_FORCED);
1619 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1620 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1621 else if (server->caps & NFS_CAP_ATIME)
1622 nfsi->cache_validity |= save_cache_validity &
1623 (NFS_INO_INVALID_ATIME
1624 | NFS_INO_REVAL_FORCED);
1626 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1627 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1628 umode_t newmode = inode->i_mode & S_IFMT;
1629 newmode |= fattr->mode & S_IALLUGO;
1630 inode->i_mode = newmode;
1631 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1633 } else if (server->caps & NFS_CAP_MODE)
1634 nfsi->cache_validity |= save_cache_validity &
1635 (NFS_INO_INVALID_ATTR
1636 | NFS_INO_INVALID_ACCESS
1637 | NFS_INO_INVALID_ACL
1638 | NFS_INO_REVAL_FORCED);
1640 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1641 if (!uid_eq(inode->i_uid, fattr->uid)) {
1642 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1643 inode->i_uid = fattr->uid;
1645 } else if (server->caps & NFS_CAP_OWNER)
1646 nfsi->cache_validity |= save_cache_validity &
1647 (NFS_INO_INVALID_ATTR
1648 | NFS_INO_INVALID_ACCESS
1649 | NFS_INO_INVALID_ACL
1650 | NFS_INO_REVAL_FORCED);
1652 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1653 if (!gid_eq(inode->i_gid, fattr->gid)) {
1654 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1655 inode->i_gid = fattr->gid;
1657 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1658 nfsi->cache_validity |= save_cache_validity &
1659 (NFS_INO_INVALID_ATTR
1660 | NFS_INO_INVALID_ACCESS
1661 | NFS_INO_INVALID_ACL
1662 | NFS_INO_REVAL_FORCED);
1664 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1665 if (inode->i_nlink != fattr->nlink) {
1666 invalid |= NFS_INO_INVALID_ATTR;
1667 if (S_ISDIR(inode->i_mode))
1668 invalid |= NFS_INO_INVALID_DATA;
1669 set_nlink(inode, fattr->nlink);
1671 } else if (server->caps & NFS_CAP_NLINK)
1672 nfsi->cache_validity |= save_cache_validity &
1673 (NFS_INO_INVALID_ATTR
1674 | NFS_INO_REVAL_FORCED);
1676 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1678 * report the blocks in 512byte units
1680 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1682 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1683 inode->i_blocks = fattr->du.nfs2.blocks;
1685 /* Update attrtimeo value if we're out of the unstable period */
1686 if (invalid & NFS_INO_INVALID_ATTR) {
1687 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1688 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1689 nfsi->attrtimeo_timestamp = now;
1690 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1692 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1693 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1694 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1695 nfsi->attrtimeo_timestamp = now;
1698 invalid &= ~NFS_INO_INVALID_ATTR;
1699 /* Don't invalidate the data if we were to blame */
1700 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1701 || S_ISLNK(inode->i_mode)))
1702 invalid &= ~NFS_INO_INVALID_DATA;
1703 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1704 (save_cache_validity & NFS_INO_REVAL_FORCED))
1705 nfsi->cache_validity |= invalid;
1707 if (invalid & NFS_INO_INVALID_DATA)
1708 nfs_fscache_invalidate(inode);
1713 * No need to worry about unhashing the dentry, as the
1714 * lookup validation will know that the inode is bad.
1715 * (But we fall through to invalidate the caches.)
1717 nfs_invalidate_inode(inode);
1721 struct inode *nfs_alloc_inode(struct super_block *sb)
1723 struct nfs_inode *nfsi;
1724 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1728 nfsi->cache_validity = 0UL;
1729 #if IS_ENABLED(CONFIG_NFS_V4)
1730 nfsi->nfs4_acl = NULL;
1731 #endif /* CONFIG_NFS_V4 */
1732 return &nfsi->vfs_inode;
1734 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1736 static void nfs_i_callback(struct rcu_head *head)
1738 struct inode *inode = container_of(head, struct inode, i_rcu);
1739 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1742 void nfs_destroy_inode(struct inode *inode)
1744 call_rcu(&inode->i_rcu, nfs_i_callback);
1746 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1748 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1750 #if IS_ENABLED(CONFIG_NFS_V4)
1751 INIT_LIST_HEAD(&nfsi->open_states);
1752 nfsi->delegation = NULL;
1753 nfsi->delegation_state = 0;
1754 init_rwsem(&nfsi->rwsem);
1755 nfsi->layout = NULL;
1759 static void init_once(void *foo)
1761 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1763 inode_init_once(&nfsi->vfs_inode);
1764 INIT_LIST_HEAD(&nfsi->open_files);
1765 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1766 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1767 INIT_LIST_HEAD(&nfsi->commit_info.list);
1769 nfsi->commit_info.ncommit = 0;
1770 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1771 atomic_set(&nfsi->silly_count, 1);
1772 INIT_HLIST_HEAD(&nfsi->silly_list);
1773 init_waitqueue_head(&nfsi->waitqueue);
1774 nfs4_init_once(nfsi);
1777 static int __init nfs_init_inodecache(void)
1779 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1780 sizeof(struct nfs_inode),
1781 0, (SLAB_RECLAIM_ACCOUNT|
1784 if (nfs_inode_cachep == NULL)
1790 static void nfs_destroy_inodecache(void)
1793 * Make sure all delayed rcu free inodes are flushed before we
1797 kmem_cache_destroy(nfs_inode_cachep);
1800 struct workqueue_struct *nfsiod_workqueue;
1801 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1804 * start up the nfsiod workqueue
1806 static int nfsiod_start(void)
1808 struct workqueue_struct *wq;
1809 dprintk("RPC: creating workqueue nfsiod\n");
1810 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1813 nfsiod_workqueue = wq;
1818 * Destroy the nfsiod workqueue
1820 static void nfsiod_stop(void)
1822 struct workqueue_struct *wq;
1824 wq = nfsiod_workqueue;
1827 nfsiod_workqueue = NULL;
1828 destroy_workqueue(wq);
1832 EXPORT_SYMBOL_GPL(nfs_net_id);
1834 static int nfs_net_init(struct net *net)
1836 nfs_clients_init(net);
1840 static void nfs_net_exit(struct net *net)
1842 nfs_cleanup_cb_ident_idr(net);
1845 static struct pernet_operations nfs_net_ops = {
1846 .init = nfs_net_init,
1847 .exit = nfs_net_exit,
1849 .size = sizeof(struct nfs_net),
1855 static int __init init_nfs_fs(void)
1859 err = register_pernet_subsys(&nfs_net_ops);
1863 err = nfs_fscache_register();
1867 err = nfsiod_start();
1871 err = nfs_fs_proc_init();
1875 err = nfs_init_nfspagecache();
1879 err = nfs_init_inodecache();
1883 err = nfs_init_readpagecache();
1887 err = nfs_init_writepagecache();
1891 err = nfs_init_directcache();
1895 #ifdef CONFIG_PROC_FS
1896 rpc_proc_register(&init_net, &nfs_rpcstat);
1898 if ((err = register_nfs_fs()) != 0)
1903 #ifdef CONFIG_PROC_FS
1904 rpc_proc_unregister(&init_net, "nfs");
1906 nfs_destroy_directcache();
1908 nfs_destroy_writepagecache();
1910 nfs_destroy_readpagecache();
1912 nfs_destroy_inodecache();
1914 nfs_destroy_nfspagecache();
1920 nfs_fscache_unregister();
1922 unregister_pernet_subsys(&nfs_net_ops);
1927 static void __exit exit_nfs_fs(void)
1929 nfs_destroy_directcache();
1930 nfs_destroy_writepagecache();
1931 nfs_destroy_readpagecache();
1932 nfs_destroy_inodecache();
1933 nfs_destroy_nfspagecache();
1934 nfs_fscache_unregister();
1935 unregister_pernet_subsys(&nfs_net_ops);
1936 #ifdef CONFIG_PROC_FS
1937 rpc_proc_unregister(&init_net, "nfs");
1939 unregister_nfs_fs();
1944 /* Not quite true; I just maintain it */
1945 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1946 MODULE_LICENSE("GPL");
1947 module_param(enable_ino64, bool, 0644);
1949 module_init(init_nfs_fs)
1950 module_exit(exit_nfs_fs)