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 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
468 (long long)NFS_FILEID(inode),
469 nfs_display_fhandle_hash(fh),
470 atomic_read(&inode->i_count));
476 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
479 EXPORT_SYMBOL_GPL(nfs_fhget);
481 #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)
484 nfs_setattr(struct dentry *dentry, struct iattr *attr)
486 struct inode *inode = dentry->d_inode;
487 struct nfs_fattr *fattr;
490 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
492 /* skip mode change if it's just for clearing setuid/setgid */
493 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
494 attr->ia_valid &= ~ATTR_MODE;
496 if (attr->ia_valid & ATTR_SIZE) {
497 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
498 attr->ia_valid &= ~ATTR_SIZE;
501 /* Optimization: if the end result is no change, don't RPC */
502 attr->ia_valid &= NFS_VALID_ATTRS;
503 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
506 /* Write all dirty data */
507 if (S_ISREG(inode->i_mode)) {
508 nfs_inode_dio_wait(inode);
512 fattr = nfs_alloc_fattr();
516 * Return any delegations if we're going to change ACLs
518 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
519 NFS_PROTO(inode)->return_delegation(inode);
520 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
522 error = nfs_refresh_inode(inode, fattr);
523 nfs_free_fattr(fattr);
527 EXPORT_SYMBOL_GPL(nfs_setattr);
530 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
531 * @inode: inode of the file used
532 * @offset: file offset to start truncating
534 * This is a copy of the common vmtruncate, but with the locking
535 * corrected to take into account the fact that NFS requires
536 * inode->i_size to be updated under the inode->i_lock.
538 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
543 err = inode_newsize_ok(inode, offset);
547 spin_lock(&inode->i_lock);
548 oldsize = inode->i_size;
549 i_size_write(inode, offset);
550 spin_unlock(&inode->i_lock);
552 truncate_pagecache(inode, oldsize, offset);
558 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
559 * @inode: pointer to struct inode
560 * @attr: pointer to struct iattr
562 * Note: we do this in the *proc.c in order to ensure that
563 * it works for things like exclusive creates too.
565 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
567 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
568 spin_lock(&inode->i_lock);
569 if ((attr->ia_valid & ATTR_MODE) != 0) {
570 int mode = attr->ia_mode & S_IALLUGO;
571 mode |= inode->i_mode & ~S_IALLUGO;
572 inode->i_mode = mode;
574 if ((attr->ia_valid & ATTR_UID) != 0)
575 inode->i_uid = attr->ia_uid;
576 if ((attr->ia_valid & ATTR_GID) != 0)
577 inode->i_gid = attr->ia_gid;
578 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
579 spin_unlock(&inode->i_lock);
581 if ((attr->ia_valid & ATTR_SIZE) != 0) {
582 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
583 nfs_vmtruncate(inode, attr->ia_size);
586 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
588 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
590 struct inode *inode = dentry->d_inode;
591 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
594 /* Flush out writes to the server in order to update c/mtime. */
595 if (S_ISREG(inode->i_mode)) {
596 nfs_inode_dio_wait(inode);
597 err = filemap_write_and_wait(inode->i_mapping);
603 * We may force a getattr if the user cares about atime.
605 * Note that we only have to check the vfsmount flags here:
606 * - NFS always sets S_NOATIME by so checking it would give a
608 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
609 * no point in checking those.
611 if ((mnt->mnt_flags & MNT_NOATIME) ||
612 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
616 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
618 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
620 generic_fillattr(inode, stat);
621 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
626 EXPORT_SYMBOL_GPL(nfs_getattr);
628 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
630 atomic_set(&l_ctx->count, 1);
631 l_ctx->lockowner.l_owner = current->files;
632 l_ctx->lockowner.l_pid = current->tgid;
633 INIT_LIST_HEAD(&l_ctx->list);
634 nfs_iocounter_init(&l_ctx->io_count);
637 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
639 struct nfs_lock_context *head = &ctx->lock_context;
640 struct nfs_lock_context *pos = head;
643 if (pos->lockowner.l_owner != current->files)
645 if (pos->lockowner.l_pid != current->tgid)
647 atomic_inc(&pos->count);
649 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
653 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
655 struct nfs_lock_context *res, *new = NULL;
656 struct inode *inode = ctx->dentry->d_inode;
658 spin_lock(&inode->i_lock);
659 res = __nfs_find_lock_context(ctx);
661 spin_unlock(&inode->i_lock);
662 new = kmalloc(sizeof(*new), GFP_KERNEL);
664 return ERR_PTR(-ENOMEM);
665 nfs_init_lock_context(new);
666 spin_lock(&inode->i_lock);
667 res = __nfs_find_lock_context(ctx);
669 list_add_tail(&new->list, &ctx->lock_context.list);
670 new->open_context = ctx;
675 spin_unlock(&inode->i_lock);
680 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
682 struct nfs_open_context *ctx = l_ctx->open_context;
683 struct inode *inode = ctx->dentry->d_inode;
685 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
687 list_del(&l_ctx->list);
688 spin_unlock(&inode->i_lock);
693 * nfs_close_context - Common close_context() routine NFSv2/v3
694 * @ctx: pointer to context
695 * @is_sync: is this a synchronous close
697 * always ensure that the attributes are up to date if we're mounted
698 * with close-to-open semantics
700 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
703 struct nfs_server *server;
705 if (!(ctx->mode & FMODE_WRITE))
709 inode = ctx->dentry->d_inode;
710 if (!list_empty(&NFS_I(inode)->open_files))
712 server = NFS_SERVER(inode);
713 if (server->flags & NFS_MOUNT_NOCTO)
715 nfs_revalidate_inode(server, inode);
717 EXPORT_SYMBOL_GPL(nfs_close_context);
719 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
721 struct nfs_open_context *ctx;
722 struct rpc_cred *cred = rpc_lookup_cred();
724 return ERR_CAST(cred);
726 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
729 return ERR_PTR(-ENOMEM);
731 nfs_sb_active(dentry->d_sb);
732 ctx->dentry = dget(dentry);
738 nfs_init_lock_context(&ctx->lock_context);
739 ctx->lock_context.open_context = ctx;
740 INIT_LIST_HEAD(&ctx->list);
741 ctx->mdsthreshold = NULL;
744 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
746 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
749 atomic_inc(&ctx->lock_context.count);
752 EXPORT_SYMBOL_GPL(get_nfs_open_context);
754 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
756 struct inode *inode = ctx->dentry->d_inode;
757 struct super_block *sb = ctx->dentry->d_sb;
759 if (!list_empty(&ctx->list)) {
760 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
762 list_del(&ctx->list);
763 spin_unlock(&inode->i_lock);
764 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
767 NFS_PROTO(inode)->close_context(ctx, is_sync);
768 if (ctx->cred != NULL)
769 put_rpccred(ctx->cred);
772 kfree(ctx->mdsthreshold);
776 void put_nfs_open_context(struct nfs_open_context *ctx)
778 __put_nfs_open_context(ctx, 0);
780 EXPORT_SYMBOL_GPL(put_nfs_open_context);
783 * Ensure that mmap has a recent RPC credential for use when writing out
786 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
788 struct inode *inode = ctx->dentry->d_inode;
789 struct nfs_inode *nfsi = NFS_I(inode);
791 spin_lock(&inode->i_lock);
792 list_add(&ctx->list, &nfsi->open_files);
793 spin_unlock(&inode->i_lock);
795 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
797 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
799 filp->private_data = get_nfs_open_context(ctx);
800 if (list_empty(&ctx->list))
801 nfs_inode_attach_open_context(ctx);
803 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
806 * Given an inode, search for an open context with the desired characteristics
808 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
810 struct nfs_inode *nfsi = NFS_I(inode);
811 struct nfs_open_context *pos, *ctx = NULL;
813 spin_lock(&inode->i_lock);
814 list_for_each_entry(pos, &nfsi->open_files, list) {
815 if (cred != NULL && pos->cred != cred)
817 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
819 ctx = get_nfs_open_context(pos);
822 spin_unlock(&inode->i_lock);
826 static void nfs_file_clear_open_context(struct file *filp)
828 struct nfs_open_context *ctx = nfs_file_open_context(filp);
831 struct inode *inode = ctx->dentry->d_inode;
833 filp->private_data = NULL;
834 spin_lock(&inode->i_lock);
835 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
836 spin_unlock(&inode->i_lock);
837 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
842 * These allocate and release file read/write context information.
844 int nfs_open(struct inode *inode, struct file *filp)
846 struct nfs_open_context *ctx;
848 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
851 nfs_file_set_open_context(filp, ctx);
852 put_nfs_open_context(ctx);
853 nfs_fscache_set_inode_cookie(inode, filp);
857 int nfs_release(struct inode *inode, struct file *filp)
859 nfs_file_clear_open_context(filp);
864 * This function is called whenever some part of NFS notices that
865 * the cached attributes have to be refreshed.
868 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
870 int status = -ESTALE;
871 struct nfs4_label *label = NULL;
872 struct nfs_fattr *fattr = NULL;
873 struct nfs_inode *nfsi = NFS_I(inode);
875 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
876 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
878 if (is_bad_inode(inode))
880 if (NFS_STALE(inode))
884 fattr = nfs_alloc_fattr();
888 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
890 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
892 status = PTR_ERR(label);
896 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
898 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
900 (long long)NFS_FILEID(inode), status);
901 if (status == -ESTALE) {
902 nfs_zap_caches(inode);
903 if (!S_ISDIR(inode->i_mode))
904 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
909 status = nfs_refresh_inode(inode, fattr);
911 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
913 (long long)NFS_FILEID(inode), status);
917 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
918 nfs_zap_acl_cache(inode);
920 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
922 (long long)NFS_FILEID(inode));
925 nfs4_label_free(label);
927 nfs_free_fattr(fattr);
931 int nfs_attribute_timeout(struct inode *inode)
933 struct nfs_inode *nfsi = NFS_I(inode);
935 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
938 int nfs_attribute_cache_expired(struct inode *inode)
940 if (nfs_have_delegated_attributes(inode))
942 return nfs_attribute_timeout(inode);
946 * nfs_revalidate_inode - Revalidate the inode attributes
947 * @server - pointer to nfs_server struct
948 * @inode - pointer to inode struct
950 * Updates inode attribute information by retrieving the data from the server.
952 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
954 if (!(NFS_I(inode)->cache_validity &
955 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
956 && !nfs_attribute_cache_expired(inode))
957 return NFS_STALE(inode) ? -ESTALE : 0;
958 return __nfs_revalidate_inode(server, inode);
960 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
962 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
964 struct nfs_inode *nfsi = NFS_I(inode);
967 if (mapping->nrpages != 0) {
968 if (S_ISREG(inode->i_mode)) {
969 ret = nfs_sync_mapping(mapping);
973 ret = invalidate_inode_pages2(mapping);
977 spin_lock(&inode->i_lock);
978 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
979 if (S_ISDIR(inode->i_mode))
980 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
981 spin_unlock(&inode->i_lock);
982 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
983 nfs_fscache_wait_on_invalidate(inode);
984 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
985 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
989 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
991 if (nfs_have_delegated_attributes(inode))
993 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
994 || nfs_attribute_timeout(inode)
999 * nfs_revalidate_mapping - Revalidate the pagecache
1000 * @inode - pointer to host inode
1001 * @mapping - pointer to mapping
1003 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1005 struct nfs_inode *nfsi = NFS_I(inode);
1008 /* swapfiles are not supposed to be shared. */
1009 if (IS_SWAPFILE(inode))
1012 if (nfs_mapping_need_revalidate_inode(inode)) {
1013 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1017 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1018 ret = nfs_invalidate_mapping(inode, mapping);
1023 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1025 struct nfs_inode *nfsi = NFS_I(inode);
1026 unsigned long ret = 0;
1028 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1029 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1030 && inode->i_version == fattr->pre_change_attr) {
1031 inode->i_version = fattr->change_attr;
1032 if (S_ISDIR(inode->i_mode))
1033 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1034 ret |= NFS_INO_INVALID_ATTR;
1036 /* If we have atomic WCC data, we may update some attributes */
1037 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1038 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1039 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1040 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1041 ret |= NFS_INO_INVALID_ATTR;
1044 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1045 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1046 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1047 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1048 if (S_ISDIR(inode->i_mode))
1049 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1050 ret |= NFS_INO_INVALID_ATTR;
1052 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1053 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1054 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1055 && nfsi->npages == 0) {
1056 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1057 ret |= NFS_INO_INVALID_ATTR;
1060 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1061 nfs_fscache_invalidate(inode);
1067 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1068 * @inode - pointer to inode
1069 * @fattr - updated attributes
1071 * Verifies the attribute cache. If we have just changed the attributes,
1072 * so that fattr carries weak cache consistency data, then it may
1073 * also update the ctime/mtime/change_attribute.
1075 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1077 struct nfs_inode *nfsi = NFS_I(inode);
1078 loff_t cur_size, new_isize;
1079 unsigned long invalid = 0;
1082 if (nfs_have_delegated_attributes(inode))
1084 /* Has the inode gone and changed behind our back? */
1085 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1087 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1090 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1091 inode->i_version != fattr->change_attr)
1092 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1094 /* Verify a few of the more important attributes */
1095 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1096 invalid |= NFS_INO_INVALID_ATTR;
1098 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1099 cur_size = i_size_read(inode);
1100 new_isize = nfs_size_to_loff_t(fattr->size);
1101 if (cur_size != new_isize && nfsi->npages == 0)
1102 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1105 /* Have any file permissions changed? */
1106 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1107 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1108 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1109 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1110 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1111 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1113 /* Has the link count changed? */
1114 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1115 invalid |= NFS_INO_INVALID_ATTR;
1117 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1118 invalid |= NFS_INO_INVALID_ATIME;
1121 nfsi->cache_validity |= invalid;
1123 nfsi->read_cache_jiffies = fattr->time_start;
1127 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1129 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1131 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1134 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1136 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1138 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1141 static atomic_long_t nfs_attr_generation_counter;
1143 static unsigned long nfs_read_attr_generation_counter(void)
1145 return atomic_long_read(&nfs_attr_generation_counter);
1148 unsigned long nfs_inc_attr_generation_counter(void)
1150 return atomic_long_inc_return(&nfs_attr_generation_counter);
1153 void nfs_fattr_init(struct nfs_fattr *fattr)
1156 fattr->time_start = jiffies;
1157 fattr->gencount = nfs_inc_attr_generation_counter();
1158 fattr->owner_name = NULL;
1159 fattr->group_name = NULL;
1161 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1163 struct nfs_fattr *nfs_alloc_fattr(void)
1165 struct nfs_fattr *fattr;
1167 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1169 nfs_fattr_init(fattr);
1172 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1174 struct nfs_fh *nfs_alloc_fhandle(void)
1178 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1183 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1187 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1188 * in the same way that wireshark does
1192 * For debugging only.
1194 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1196 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1197 * not on the result */
1198 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1202 * _nfs_display_fhandle - display an NFS file handle on the console
1204 * @fh: file handle to display
1205 * @caption: display caption
1207 * For debugging only.
1209 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1213 if (fh == NULL || fh->size == 0) {
1214 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1218 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1219 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1220 for (i = 0; i < fh->size; i += 16) {
1221 __be32 *pos = (__be32 *)&fh->data[i];
1223 switch ((fh->size - i - 1) >> 2) {
1225 printk(KERN_DEFAULT " %08x\n",
1229 printk(KERN_DEFAULT " %08x %08x\n",
1230 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1233 printk(KERN_DEFAULT " %08x %08x %08x\n",
1234 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1235 be32_to_cpup(pos + 2));
1238 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1239 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1240 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1247 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1248 * @inode - pointer to inode
1249 * @fattr - attributes
1251 * Attempt to divine whether or not an RPC call reply carrying stale
1252 * attributes got scheduled after another call carrying updated ones.
1254 * To do so, the function first assumes that a more recent ctime means
1255 * that the attributes in fattr are newer, however it also attempt to
1256 * catch the case where ctime either didn't change, or went backwards
1257 * (if someone reset the clock on the server) by looking at whether
1258 * or not this RPC call was started after the inode was last updated.
1259 * Note also the check for wraparound of 'attr_gencount'
1261 * The function returns 'true' if it thinks the attributes in 'fattr' are
1262 * more recent than the ones cached in the inode.
1265 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1267 const struct nfs_inode *nfsi = NFS_I(inode);
1269 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1270 nfs_ctime_need_update(inode, fattr) ||
1271 nfs_size_need_update(inode, fattr) ||
1272 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1275 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1277 if (nfs_inode_attrs_need_update(inode, fattr))
1278 return nfs_update_inode(inode, fattr);
1279 return nfs_check_inode_attributes(inode, fattr);
1283 * nfs_refresh_inode - try to update the inode attribute cache
1284 * @inode - pointer to inode
1285 * @fattr - updated attributes
1287 * Check that an RPC call that returned attributes has not overlapped with
1288 * other recent updates of the inode metadata, then decide whether it is
1289 * safe to do a full update of the inode attributes, or whether just to
1290 * call nfs_check_inode_attributes.
1292 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1296 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1298 spin_lock(&inode->i_lock);
1299 status = nfs_refresh_inode_locked(inode, fattr);
1300 spin_unlock(&inode->i_lock);
1304 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1306 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1308 struct nfs_inode *nfsi = NFS_I(inode);
1310 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1311 if (S_ISDIR(inode->i_mode)) {
1312 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1313 nfs_fscache_invalidate(inode);
1315 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1317 return nfs_refresh_inode_locked(inode, fattr);
1321 * nfs_post_op_update_inode - try to update the inode attribute cache
1322 * @inode - pointer to inode
1323 * @fattr - updated attributes
1325 * After an operation that has changed the inode metadata, mark the
1326 * attribute cache as being invalid, then try to update it.
1328 * NB: if the server didn't return any post op attributes, this
1329 * function will force the retrieval of attributes before the next
1330 * NFS request. Thus it should be used only for operations that
1331 * are expected to change one or more attributes, to avoid
1332 * unnecessary NFS requests and trips through nfs_update_inode().
1334 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1338 spin_lock(&inode->i_lock);
1339 status = nfs_post_op_update_inode_locked(inode, fattr);
1340 spin_unlock(&inode->i_lock);
1344 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1347 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1348 * @inode - pointer to inode
1349 * @fattr - updated attributes
1351 * After an operation that has changed the inode metadata, mark the
1352 * attribute cache as being invalid, then try to update it. Fake up
1353 * weak cache consistency data, if none exist.
1355 * This function is mainly designed to be used by the ->write_done() functions.
1357 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1361 spin_lock(&inode->i_lock);
1362 /* Don't do a WCC update if these attributes are already stale */
1363 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1364 !nfs_inode_attrs_need_update(inode, fattr)) {
1365 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1366 | NFS_ATTR_FATTR_PRESIZE
1367 | NFS_ATTR_FATTR_PREMTIME
1368 | NFS_ATTR_FATTR_PRECTIME);
1371 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1372 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1373 fattr->pre_change_attr = inode->i_version;
1374 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1376 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1377 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1378 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1379 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1381 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1382 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1383 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1384 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1386 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1387 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1388 fattr->pre_size = i_size_read(inode);
1389 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1392 status = nfs_post_op_update_inode_locked(inode, fattr);
1393 spin_unlock(&inode->i_lock);
1396 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1399 * Many nfs protocol calls return the new file attributes after
1400 * an operation. Here we update the inode to reflect the state
1401 * of the server's inode.
1403 * This is a bit tricky because we have to make sure all dirty pages
1404 * have been sent off to the server before calling invalidate_inode_pages.
1405 * To make sure no other process adds more write requests while we try
1406 * our best to flush them, we make them sleep during the attribute refresh.
1408 * A very similar scenario holds for the dir cache.
1410 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1412 struct nfs_server *server;
1413 struct nfs_inode *nfsi = NFS_I(inode);
1414 loff_t cur_isize, new_isize;
1415 unsigned long invalid = 0;
1416 unsigned long now = jiffies;
1417 unsigned long save_cache_validity;
1419 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1420 __func__, inode->i_sb->s_id, inode->i_ino,
1421 nfs_display_fhandle_hash(NFS_FH(inode)),
1422 atomic_read(&inode->i_count), fattr->valid);
1424 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1425 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1426 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1427 NFS_SERVER(inode)->nfs_client->cl_hostname,
1428 inode->i_sb->s_id, (long long)nfsi->fileid,
1429 (long long)fattr->fileid);
1434 * Make sure the inode's type hasn't changed.
1436 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1438 * Big trouble! The inode has become a different object.
1440 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1441 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1445 server = NFS_SERVER(inode);
1446 /* Update the fsid? */
1447 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1448 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1449 !IS_AUTOMOUNT(inode))
1450 server->fsid = fattr->fsid;
1453 * Update the read time so we don't revalidate too often.
1455 nfsi->read_cache_jiffies = fattr->time_start;
1457 save_cache_validity = nfsi->cache_validity;
1458 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1459 | NFS_INO_INVALID_ATIME
1460 | NFS_INO_REVAL_FORCED
1461 | NFS_INO_REVAL_PAGECACHE);
1463 /* Do atomic weak cache consistency updates */
1464 invalid |= nfs_wcc_update_inode(inode, fattr);
1466 /* More cache consistency checks */
1467 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1468 if (inode->i_version != fattr->change_attr) {
1469 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1470 inode->i_sb->s_id, inode->i_ino);
1471 invalid |= NFS_INO_INVALID_ATTR
1472 | NFS_INO_INVALID_DATA
1473 | NFS_INO_INVALID_ACCESS
1474 | NFS_INO_INVALID_ACL
1475 | NFS_INO_REVAL_PAGECACHE;
1476 if (S_ISDIR(inode->i_mode))
1477 nfs_force_lookup_revalidate(inode);
1478 inode->i_version = fattr->change_attr;
1480 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1481 invalid |= save_cache_validity;
1483 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1484 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1485 } else if (server->caps & NFS_CAP_MTIME)
1486 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1487 | NFS_INO_REVAL_FORCED);
1489 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1490 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1491 } else if (server->caps & NFS_CAP_CTIME)
1492 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1493 | NFS_INO_REVAL_FORCED);
1495 /* Check if our cached file size is stale */
1496 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1497 new_isize = nfs_size_to_loff_t(fattr->size);
1498 cur_isize = i_size_read(inode);
1499 if (new_isize != cur_isize) {
1500 /* Do we perhaps have any outstanding writes, or has
1501 * the file grown beyond our last write? */
1502 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1503 new_isize > cur_isize) {
1504 i_size_write(inode, new_isize);
1505 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1507 dprintk("NFS: isize change on server for file %s/%ld "
1511 (long long)cur_isize,
1512 (long long)new_isize);
1515 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1516 | NFS_INO_REVAL_PAGECACHE
1517 | NFS_INO_REVAL_FORCED);
1520 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1521 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1522 else if (server->caps & NFS_CAP_ATIME)
1523 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1524 | NFS_INO_REVAL_FORCED);
1526 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1527 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1528 umode_t newmode = inode->i_mode & S_IFMT;
1529 newmode |= fattr->mode & S_IALLUGO;
1530 inode->i_mode = newmode;
1531 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1533 } else if (server->caps & NFS_CAP_MODE)
1534 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1535 | NFS_INO_INVALID_ACCESS
1536 | NFS_INO_INVALID_ACL
1537 | NFS_INO_REVAL_FORCED);
1539 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1540 if (!uid_eq(inode->i_uid, fattr->uid)) {
1541 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1542 inode->i_uid = fattr->uid;
1544 } else if (server->caps & NFS_CAP_OWNER)
1545 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1546 | NFS_INO_INVALID_ACCESS
1547 | NFS_INO_INVALID_ACL
1548 | NFS_INO_REVAL_FORCED);
1550 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1551 if (!gid_eq(inode->i_gid, fattr->gid)) {
1552 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1553 inode->i_gid = fattr->gid;
1555 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1556 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1557 | NFS_INO_INVALID_ACCESS
1558 | NFS_INO_INVALID_ACL
1559 | NFS_INO_REVAL_FORCED);
1561 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1562 if (inode->i_nlink != fattr->nlink) {
1563 invalid |= NFS_INO_INVALID_ATTR;
1564 if (S_ISDIR(inode->i_mode))
1565 invalid |= NFS_INO_INVALID_DATA;
1566 set_nlink(inode, fattr->nlink);
1568 } else if (server->caps & NFS_CAP_NLINK)
1569 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1570 | NFS_INO_REVAL_FORCED);
1572 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1574 * report the blocks in 512byte units
1576 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1578 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1579 inode->i_blocks = fattr->du.nfs2.blocks;
1581 /* Update attrtimeo value if we're out of the unstable period */
1582 if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) {
1583 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1584 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1585 nfsi->attrtimeo_timestamp = now;
1586 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1588 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1589 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1590 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1591 nfsi->attrtimeo_timestamp = now;
1594 invalid &= ~NFS_INO_INVALID_ATTR;
1595 invalid &= ~NFS_INO_INVALID_LABEL;
1596 /* Don't invalidate the data if we were to blame */
1597 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1598 || S_ISLNK(inode->i_mode)))
1599 invalid &= ~NFS_INO_INVALID_DATA;
1600 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1601 (save_cache_validity & NFS_INO_REVAL_FORCED))
1602 nfsi->cache_validity |= invalid;
1604 if (invalid & NFS_INO_INVALID_DATA)
1605 nfs_fscache_invalidate(inode);
1610 * No need to worry about unhashing the dentry, as the
1611 * lookup validation will know that the inode is bad.
1612 * (But we fall through to invalidate the caches.)
1614 nfs_invalidate_inode(inode);
1618 struct inode *nfs_alloc_inode(struct super_block *sb)
1620 struct nfs_inode *nfsi;
1621 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1625 nfsi->cache_validity = 0UL;
1626 #ifdef CONFIG_NFS_V3_ACL
1627 nfsi->acl_access = ERR_PTR(-EAGAIN);
1628 nfsi->acl_default = ERR_PTR(-EAGAIN);
1630 #if IS_ENABLED(CONFIG_NFS_V4)
1631 nfsi->nfs4_acl = NULL;
1632 #endif /* CONFIG_NFS_V4 */
1633 return &nfsi->vfs_inode;
1635 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1637 static void nfs_i_callback(struct rcu_head *head)
1639 struct inode *inode = container_of(head, struct inode, i_rcu);
1640 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1643 void nfs_destroy_inode(struct inode *inode)
1645 call_rcu(&inode->i_rcu, nfs_i_callback);
1647 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1649 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1651 #if IS_ENABLED(CONFIG_NFS_V4)
1652 INIT_LIST_HEAD(&nfsi->open_states);
1653 nfsi->delegation = NULL;
1654 nfsi->delegation_state = 0;
1655 init_rwsem(&nfsi->rwsem);
1656 nfsi->layout = NULL;
1660 static void init_once(void *foo)
1662 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1664 inode_init_once(&nfsi->vfs_inode);
1665 INIT_LIST_HEAD(&nfsi->open_files);
1666 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1667 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1668 INIT_LIST_HEAD(&nfsi->commit_info.list);
1670 nfsi->commit_info.ncommit = 0;
1671 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1672 atomic_set(&nfsi->silly_count, 1);
1673 INIT_HLIST_HEAD(&nfsi->silly_list);
1674 init_waitqueue_head(&nfsi->waitqueue);
1675 nfs4_init_once(nfsi);
1678 static int __init nfs_init_inodecache(void)
1680 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1681 sizeof(struct nfs_inode),
1682 0, (SLAB_RECLAIM_ACCOUNT|
1685 if (nfs_inode_cachep == NULL)
1691 static void nfs_destroy_inodecache(void)
1694 * Make sure all delayed rcu free inodes are flushed before we
1698 kmem_cache_destroy(nfs_inode_cachep);
1701 struct workqueue_struct *nfsiod_workqueue;
1702 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1705 * start up the nfsiod workqueue
1707 static int nfsiod_start(void)
1709 struct workqueue_struct *wq;
1710 dprintk("RPC: creating workqueue nfsiod\n");
1711 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1714 nfsiod_workqueue = wq;
1719 * Destroy the nfsiod workqueue
1721 static void nfsiod_stop(void)
1723 struct workqueue_struct *wq;
1725 wq = nfsiod_workqueue;
1728 nfsiod_workqueue = NULL;
1729 destroy_workqueue(wq);
1733 EXPORT_SYMBOL_GPL(nfs_net_id);
1735 static int nfs_net_init(struct net *net)
1737 nfs_clients_init(net);
1741 static void nfs_net_exit(struct net *net)
1743 nfs_cleanup_cb_ident_idr(net);
1746 static struct pernet_operations nfs_net_ops = {
1747 .init = nfs_net_init,
1748 .exit = nfs_net_exit,
1750 .size = sizeof(struct nfs_net),
1756 static int __init init_nfs_fs(void)
1760 err = register_pernet_subsys(&nfs_net_ops);
1764 err = nfs_fscache_register();
1768 err = nfsiod_start();
1772 err = nfs_fs_proc_init();
1776 err = nfs_init_nfspagecache();
1780 err = nfs_init_inodecache();
1784 err = nfs_init_readpagecache();
1788 err = nfs_init_writepagecache();
1792 err = nfs_init_directcache();
1796 #ifdef CONFIG_PROC_FS
1797 rpc_proc_register(&init_net, &nfs_rpcstat);
1799 if ((err = register_nfs_fs()) != 0)
1804 #ifdef CONFIG_PROC_FS
1805 rpc_proc_unregister(&init_net, "nfs");
1807 nfs_destroy_directcache();
1809 nfs_destroy_writepagecache();
1811 nfs_destroy_readpagecache();
1813 nfs_destroy_inodecache();
1815 nfs_destroy_nfspagecache();
1821 nfs_fscache_unregister();
1823 unregister_pernet_subsys(&nfs_net_ops);
1828 static void __exit exit_nfs_fs(void)
1830 nfs_destroy_directcache();
1831 nfs_destroy_writepagecache();
1832 nfs_destroy_readpagecache();
1833 nfs_destroy_inodecache();
1834 nfs_destroy_nfspagecache();
1835 nfs_fscache_unregister();
1836 unregister_pernet_subsys(&nfs_net_ops);
1837 #ifdef CONFIG_PROC_FS
1838 rpc_proc_unregister(&init_net, "nfs");
1840 unregister_nfs_fs();
1845 /* Not quite true; I just maintain it */
1846 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1847 MODULE_LICENSE("GPL");
1848 module_param(enable_ino64, bool, 0644);
1850 module_init(init_nfs_fs)
1851 module_exit(exit_nfs_fs)