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"
51 #include "dns_resolve.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))
86 * nfs_compat_user_ino64 - returns the user-visible inode number
87 * @fileid: 64-bit fileid
89 * This function returns a 32-bit inode number if the boot parameter
90 * nfs.enable_ino64 is zero.
92 u64 nfs_compat_user_ino64(u64 fileid)
103 if (sizeof(ino) < sizeof(fileid))
104 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
108 static void nfs_clear_inode(struct inode *inode)
111 * The following should never happen...
113 BUG_ON(nfs_have_writebacks(inode));
114 BUG_ON(!list_empty(&NFS_I(inode)->open_files));
115 nfs_zap_acl_cache(inode);
116 nfs_access_zap_cache(inode);
117 nfs_fscache_release_inode_cookie(inode);
120 void nfs_evict_inode(struct inode *inode)
122 truncate_inode_pages(&inode->i_data, 0);
124 nfs_clear_inode(inode);
128 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
130 int nfs_sync_mapping(struct address_space *mapping)
134 if (mapping->nrpages != 0) {
135 unmap_mapping_range(mapping, 0, 0, 0);
136 ret = nfs_wb_all(mapping->host);
142 * Invalidate the local caches
144 static void nfs_zap_caches_locked(struct inode *inode)
146 struct nfs_inode *nfsi = NFS_I(inode);
147 int mode = inode->i_mode;
149 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
151 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
152 nfsi->attrtimeo_timestamp = jiffies;
154 memset(NFS_COOKIEVERF(inode), 0, sizeof(NFS_COOKIEVERF(inode)));
155 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
156 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
158 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL|NFS_INO_REVAL_PAGECACHE;
161 void nfs_zap_caches(struct inode *inode)
163 spin_lock(&inode->i_lock);
164 nfs_zap_caches_locked(inode);
165 spin_unlock(&inode->i_lock);
168 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
170 if (mapping->nrpages != 0) {
171 spin_lock(&inode->i_lock);
172 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
173 spin_unlock(&inode->i_lock);
177 void nfs_zap_acl_cache(struct inode *inode)
179 void (*clear_acl_cache)(struct inode *);
181 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
182 if (clear_acl_cache != NULL)
183 clear_acl_cache(inode);
184 spin_lock(&inode->i_lock);
185 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
186 spin_unlock(&inode->i_lock);
189 void nfs_invalidate_atime(struct inode *inode)
191 spin_lock(&inode->i_lock);
192 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
193 spin_unlock(&inode->i_lock);
197 * Invalidate, but do not unhash, the inode.
198 * NB: must be called with inode->i_lock held!
200 static void nfs_invalidate_inode(struct inode *inode)
202 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
203 nfs_zap_caches_locked(inode);
206 struct nfs_find_desc {
208 struct nfs_fattr *fattr;
212 * In NFSv3 we can have 64bit inode numbers. In order to support
213 * this, and re-exported directories (also seen in NFSv2)
214 * we are forced to allow 2 different inodes to have the same
218 nfs_find_actor(struct inode *inode, void *opaque)
220 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
221 struct nfs_fh *fh = desc->fh;
222 struct nfs_fattr *fattr = desc->fattr;
224 if (NFS_FILEID(inode) != fattr->fileid)
226 if (nfs_compare_fh(NFS_FH(inode), fh))
228 if (is_bad_inode(inode) || NFS_STALE(inode))
234 nfs_init_locked(struct inode *inode, void *opaque)
236 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
237 struct nfs_fattr *fattr = desc->fattr;
239 set_nfs_fileid(inode, fattr->fileid);
240 nfs_copy_fh(NFS_FH(inode), desc->fh);
245 * This is our front-end to iget that looks up inodes by file handle
246 * instead of inode number.
249 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
251 struct nfs_find_desc desc = {
255 struct inode *inode = ERR_PTR(-ENOENT);
258 nfs_attr_check_mountpoint(sb, fattr);
260 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
261 !nfs_attr_use_mounted_on_fileid(fattr))
263 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
266 hash = nfs_fattr_to_ino_t(fattr);
268 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
270 inode = ERR_PTR(-ENOMEM);
274 if (inode->i_state & I_NEW) {
275 struct nfs_inode *nfsi = NFS_I(inode);
276 unsigned long now = jiffies;
278 /* We set i_ino for the few things that still rely on it,
282 /* We can't support update_atime(), since the server will reset it */
283 inode->i_flags |= S_NOATIME|S_NOCMTIME;
284 inode->i_mode = fattr->mode;
285 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
286 && nfs_server_capable(inode, NFS_CAP_MODE))
287 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
288 /* Why so? Because we want revalidate for devices/FIFOs, and
289 * that's precisely what we have in nfs_file_inode_operations.
291 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
292 if (S_ISREG(inode->i_mode)) {
293 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
294 inode->i_data.a_ops = &nfs_file_aops;
295 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
296 } else if (S_ISDIR(inode->i_mode)) {
297 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
298 inode->i_fop = &nfs_dir_operations;
299 inode->i_data.a_ops = &nfs_dir_aops;
300 /* Deal with crossing mountpoints */
301 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
302 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
303 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
304 inode->i_op = &nfs_referral_inode_operations;
306 inode->i_op = &nfs_mountpoint_inode_operations;
308 inode->i_flags |= S_AUTOMOUNT;
310 } else if (S_ISLNK(inode->i_mode))
311 inode->i_op = &nfs_symlink_inode_operations;
313 init_special_inode(inode, inode->i_mode, fattr->rdev);
315 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
316 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
317 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
318 inode->i_version = 0;
324 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
328 nfsi->read_cache_jiffies = fattr->time_start;
329 nfsi->attr_gencount = fattr->gencount;
330 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
331 inode->i_atime = fattr->atime;
332 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
333 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
334 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
335 inode->i_mtime = fattr->mtime;
336 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
337 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
338 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
339 inode->i_ctime = fattr->ctime;
340 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
341 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
342 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
343 inode->i_version = fattr->change_attr;
344 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
345 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
346 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
347 inode->i_size = nfs_size_to_loff_t(fattr->size);
349 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
350 | NFS_INO_REVAL_PAGECACHE;
351 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
352 set_nlink(inode, fattr->nlink);
353 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
354 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
355 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
356 inode->i_uid = fattr->uid;
357 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
358 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
359 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
360 inode->i_gid = fattr->gid;
361 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
362 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
363 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
364 inode->i_blocks = fattr->du.nfs2.blocks;
365 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
367 * report the blocks in 512byte units
369 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
371 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
372 nfsi->attrtimeo_timestamp = now;
373 nfsi->access_cache = RB_ROOT;
375 nfs_fscache_init_inode_cookie(inode);
377 unlock_new_inode(inode);
379 nfs_refresh_inode(inode, fattr);
380 dprintk("NFS: nfs_fhget(%s/%Ld fh_crc=0x%08x ct=%d)\n",
382 (long long)NFS_FILEID(inode),
383 nfs_display_fhandle_hash(fh),
384 atomic_read(&inode->i_count));
390 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
394 #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)
397 nfs_setattr(struct dentry *dentry, struct iattr *attr)
399 struct inode *inode = dentry->d_inode;
400 struct nfs_fattr *fattr;
403 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
405 /* skip mode change if it's just for clearing setuid/setgid */
406 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
407 attr->ia_valid &= ~ATTR_MODE;
409 if (attr->ia_valid & ATTR_SIZE) {
410 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
411 attr->ia_valid &= ~ATTR_SIZE;
414 /* Optimization: if the end result is no change, don't RPC */
415 attr->ia_valid &= NFS_VALID_ATTRS;
416 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
419 /* Write all dirty data */
420 if (S_ISREG(inode->i_mode)) {
421 nfs_inode_dio_wait(inode);
425 fattr = nfs_alloc_fattr();
429 * Return any delegations if we're going to change ACLs
431 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
432 NFS_PROTO(inode)->return_delegation(inode);
433 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
435 nfs_refresh_inode(inode, fattr);
436 nfs_free_fattr(fattr);
442 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
443 * @inode: inode of the file used
444 * @offset: file offset to start truncating
446 * This is a copy of the common vmtruncate, but with the locking
447 * corrected to take into account the fact that NFS requires
448 * inode->i_size to be updated under the inode->i_lock.
450 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
455 err = inode_newsize_ok(inode, offset);
459 spin_lock(&inode->i_lock);
460 oldsize = inode->i_size;
461 i_size_write(inode, offset);
462 spin_unlock(&inode->i_lock);
464 truncate_pagecache(inode, oldsize, offset);
470 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
471 * @inode: pointer to struct inode
472 * @attr: pointer to struct iattr
474 * Note: we do this in the *proc.c in order to ensure that
475 * it works for things like exclusive creates too.
477 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
479 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
480 spin_lock(&inode->i_lock);
481 if ((attr->ia_valid & ATTR_MODE) != 0) {
482 int mode = attr->ia_mode & S_IALLUGO;
483 mode |= inode->i_mode & ~S_IALLUGO;
484 inode->i_mode = mode;
486 if ((attr->ia_valid & ATTR_UID) != 0)
487 inode->i_uid = attr->ia_uid;
488 if ((attr->ia_valid & ATTR_GID) != 0)
489 inode->i_gid = attr->ia_gid;
490 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
491 spin_unlock(&inode->i_lock);
493 if ((attr->ia_valid & ATTR_SIZE) != 0) {
494 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
495 nfs_vmtruncate(inode, attr->ia_size);
499 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
501 struct inode *inode = dentry->d_inode;
502 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
505 /* Flush out writes to the server in order to update c/mtime. */
506 if (S_ISREG(inode->i_mode)) {
507 nfs_inode_dio_wait(inode);
508 err = filemap_write_and_wait(inode->i_mapping);
514 * We may force a getattr if the user cares about atime.
516 * Note that we only have to check the vfsmount flags here:
517 * - NFS always sets S_NOATIME by so checking it would give a
519 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
520 * no point in checking those.
522 if ((mnt->mnt_flags & MNT_NOATIME) ||
523 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
527 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
529 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
531 generic_fillattr(inode, stat);
532 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
538 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
540 atomic_set(&l_ctx->count, 1);
541 l_ctx->lockowner = current->files;
542 l_ctx->pid = current->tgid;
543 INIT_LIST_HEAD(&l_ctx->list);
546 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
548 struct nfs_lock_context *pos;
550 list_for_each_entry(pos, &ctx->lock_context.list, list) {
551 if (pos->lockowner != current->files)
553 if (pos->pid != current->tgid)
555 atomic_inc(&pos->count);
561 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
563 struct nfs_lock_context *res, *new = NULL;
564 struct inode *inode = ctx->dentry->d_inode;
566 spin_lock(&inode->i_lock);
567 res = __nfs_find_lock_context(ctx);
569 spin_unlock(&inode->i_lock);
570 new = kmalloc(sizeof(*new), GFP_KERNEL);
573 nfs_init_lock_context(new);
574 spin_lock(&inode->i_lock);
575 res = __nfs_find_lock_context(ctx);
577 list_add_tail(&new->list, &ctx->lock_context.list);
578 new->open_context = ctx;
583 spin_unlock(&inode->i_lock);
588 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
590 struct nfs_open_context *ctx = l_ctx->open_context;
591 struct inode *inode = ctx->dentry->d_inode;
593 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
595 list_del(&l_ctx->list);
596 spin_unlock(&inode->i_lock);
601 * nfs_close_context - Common close_context() routine NFSv2/v3
602 * @ctx: pointer to context
603 * @is_sync: is this a synchronous close
605 * always ensure that the attributes are up to date if we're mounted
606 * with close-to-open semantics
608 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
611 struct nfs_server *server;
613 if (!(ctx->mode & FMODE_WRITE))
617 inode = ctx->dentry->d_inode;
618 if (!list_empty(&NFS_I(inode)->open_files))
620 server = NFS_SERVER(inode);
621 if (server->flags & NFS_MOUNT_NOCTO)
623 nfs_revalidate_inode(server, inode);
626 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
628 struct nfs_open_context *ctx;
629 struct rpc_cred *cred = rpc_lookup_cred();
631 return ERR_CAST(cred);
633 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
636 return ERR_PTR(-ENOMEM);
638 nfs_sb_active(dentry->d_sb);
639 ctx->dentry = dget(dentry);
645 nfs_init_lock_context(&ctx->lock_context);
646 ctx->lock_context.open_context = ctx;
647 INIT_LIST_HEAD(&ctx->list);
648 ctx->mdsthreshold = NULL;
652 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
655 atomic_inc(&ctx->lock_context.count);
659 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
661 struct inode *inode = ctx->dentry->d_inode;
662 struct super_block *sb = ctx->dentry->d_sb;
664 if (!list_empty(&ctx->list)) {
665 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
667 list_del(&ctx->list);
668 spin_unlock(&inode->i_lock);
669 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
672 NFS_PROTO(inode)->close_context(ctx, is_sync);
673 if (ctx->cred != NULL)
674 put_rpccred(ctx->cred);
677 kfree(ctx->mdsthreshold);
681 void put_nfs_open_context(struct nfs_open_context *ctx)
683 __put_nfs_open_context(ctx, 0);
687 * Ensure that mmap has a recent RPC credential for use when writing out
690 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
692 struct inode *inode = filp->f_path.dentry->d_inode;
693 struct nfs_inode *nfsi = NFS_I(inode);
695 filp->private_data = get_nfs_open_context(ctx);
696 spin_lock(&inode->i_lock);
697 list_add(&ctx->list, &nfsi->open_files);
698 spin_unlock(&inode->i_lock);
702 * Given an inode, search for an open context with the desired characteristics
704 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
706 struct nfs_inode *nfsi = NFS_I(inode);
707 struct nfs_open_context *pos, *ctx = NULL;
709 spin_lock(&inode->i_lock);
710 list_for_each_entry(pos, &nfsi->open_files, list) {
711 if (cred != NULL && pos->cred != cred)
713 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
715 ctx = get_nfs_open_context(pos);
718 spin_unlock(&inode->i_lock);
722 static void nfs_file_clear_open_context(struct file *filp)
724 struct inode *inode = filp->f_path.dentry->d_inode;
725 struct nfs_open_context *ctx = nfs_file_open_context(filp);
728 filp->private_data = NULL;
729 spin_lock(&inode->i_lock);
730 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
731 spin_unlock(&inode->i_lock);
732 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
737 * These allocate and release file read/write context information.
739 int nfs_open(struct inode *inode, struct file *filp)
741 struct nfs_open_context *ctx;
743 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
746 nfs_file_set_open_context(filp, ctx);
747 put_nfs_open_context(ctx);
748 nfs_fscache_set_inode_cookie(inode, filp);
752 int nfs_release(struct inode *inode, struct file *filp)
754 nfs_file_clear_open_context(filp);
759 * This function is called whenever some part of NFS notices that
760 * the cached attributes have to be refreshed.
763 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
765 int status = -ESTALE;
766 struct nfs_fattr *fattr = NULL;
767 struct nfs_inode *nfsi = NFS_I(inode);
769 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Ld)\n",
770 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
772 if (is_bad_inode(inode))
774 if (NFS_STALE(inode))
778 fattr = nfs_alloc_fattr();
782 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
783 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr);
785 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) getattr failed, error=%d\n",
787 (long long)NFS_FILEID(inode), status);
788 if (status == -ESTALE) {
789 nfs_zap_caches(inode);
790 if (!S_ISDIR(inode->i_mode))
791 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
796 status = nfs_refresh_inode(inode, fattr);
798 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Ld) refresh failed, error=%d\n",
800 (long long)NFS_FILEID(inode), status);
804 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
805 nfs_zap_acl_cache(inode);
807 dfprintk(PAGECACHE, "NFS: (%s/%Ld) revalidation complete\n",
809 (long long)NFS_FILEID(inode));
812 nfs_free_fattr(fattr);
816 int nfs_attribute_timeout(struct inode *inode)
818 struct nfs_inode *nfsi = NFS_I(inode);
820 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
823 static int nfs_attribute_cache_expired(struct inode *inode)
825 if (nfs_have_delegated_attributes(inode))
827 return nfs_attribute_timeout(inode);
831 * nfs_revalidate_inode - Revalidate the inode attributes
832 * @server - pointer to nfs_server struct
833 * @inode - pointer to inode struct
835 * Updates inode attribute information by retrieving the data from the server.
837 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
839 if (!(NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATTR)
840 && !nfs_attribute_cache_expired(inode))
841 return NFS_STALE(inode) ? -ESTALE : 0;
842 return __nfs_revalidate_inode(server, inode);
845 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
847 struct nfs_inode *nfsi = NFS_I(inode);
849 if (mapping->nrpages != 0) {
850 int ret = invalidate_inode_pages2(mapping);
854 spin_lock(&inode->i_lock);
855 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
856 if (S_ISDIR(inode->i_mode))
857 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
858 spin_unlock(&inode->i_lock);
859 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
860 nfs_fscache_reset_inode_cookie(inode);
861 dfprintk(PAGECACHE, "NFS: (%s/%Ld) data cache invalidated\n",
862 inode->i_sb->s_id, (long long)NFS_FILEID(inode));
866 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
868 if (nfs_have_delegated_attributes(inode))
870 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
871 || nfs_attribute_timeout(inode)
876 * nfs_revalidate_mapping - Revalidate the pagecache
877 * @inode - pointer to host inode
878 * @mapping - pointer to mapping
880 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
882 struct nfs_inode *nfsi = NFS_I(inode);
885 if (nfs_mapping_need_revalidate_inode(inode)) {
886 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
890 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
891 ret = nfs_invalidate_mapping(inode, mapping);
896 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
898 struct nfs_inode *nfsi = NFS_I(inode);
899 unsigned long ret = 0;
901 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
902 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
903 && inode->i_version == fattr->pre_change_attr) {
904 inode->i_version = fattr->change_attr;
905 if (S_ISDIR(inode->i_mode))
906 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
907 ret |= NFS_INO_INVALID_ATTR;
909 /* If we have atomic WCC data, we may update some attributes */
910 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
911 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
912 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
913 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
914 ret |= NFS_INO_INVALID_ATTR;
917 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
918 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
919 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
920 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
921 if (S_ISDIR(inode->i_mode))
922 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
923 ret |= NFS_INO_INVALID_ATTR;
925 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
926 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
927 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
928 && nfsi->npages == 0) {
929 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
930 ret |= NFS_INO_INVALID_ATTR;
936 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
937 * @inode - pointer to inode
938 * @fattr - updated attributes
940 * Verifies the attribute cache. If we have just changed the attributes,
941 * so that fattr carries weak cache consistency data, then it may
942 * also update the ctime/mtime/change_attribute.
944 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
946 struct nfs_inode *nfsi = NFS_I(inode);
947 loff_t cur_size, new_isize;
948 unsigned long invalid = 0;
951 if (nfs_have_delegated_attributes(inode))
953 /* Has the inode gone and changed behind our back? */
954 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
956 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
959 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
960 inode->i_version != fattr->change_attr)
961 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
963 /* Verify a few of the more important attributes */
964 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
965 invalid |= NFS_INO_INVALID_ATTR;
967 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
968 cur_size = i_size_read(inode);
969 new_isize = nfs_size_to_loff_t(fattr->size);
970 if (cur_size != new_isize && nfsi->npages == 0)
971 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
974 /* Have any file permissions changed? */
975 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
976 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
977 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && inode->i_uid != fattr->uid)
978 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
979 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && inode->i_gid != fattr->gid)
980 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
982 /* Has the link count changed? */
983 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
984 invalid |= NFS_INO_INVALID_ATTR;
986 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
987 invalid |= NFS_INO_INVALID_ATIME;
990 nfsi->cache_validity |= invalid;
992 nfsi->read_cache_jiffies = fattr->time_start;
996 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
998 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1000 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1003 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1005 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1007 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1010 static atomic_long_t nfs_attr_generation_counter;
1012 static unsigned long nfs_read_attr_generation_counter(void)
1014 return atomic_long_read(&nfs_attr_generation_counter);
1017 unsigned long nfs_inc_attr_generation_counter(void)
1019 return atomic_long_inc_return(&nfs_attr_generation_counter);
1022 void nfs_fattr_init(struct nfs_fattr *fattr)
1025 fattr->time_start = jiffies;
1026 fattr->gencount = nfs_inc_attr_generation_counter();
1027 fattr->owner_name = NULL;
1028 fattr->group_name = NULL;
1031 struct nfs_fattr *nfs_alloc_fattr(void)
1033 struct nfs_fattr *fattr;
1035 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1037 nfs_fattr_init(fattr);
1041 struct nfs_fh *nfs_alloc_fhandle(void)
1045 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1053 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1054 * in the same way that wireshark does
1058 * For debugging only.
1060 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1062 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1063 * not on the result */
1064 return ~crc32(0xFFFFFFFF, &fh->data[0], fh->size);
1068 * _nfs_display_fhandle - display an NFS file handle on the console
1070 * @fh: file handle to display
1071 * @caption: display caption
1073 * For debugging only.
1075 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1079 if (fh == NULL || fh->size == 0) {
1080 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1084 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1085 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1086 for (i = 0; i < fh->size; i += 16) {
1087 __be32 *pos = (__be32 *)&fh->data[i];
1089 switch ((fh->size - i - 1) >> 2) {
1091 printk(KERN_DEFAULT " %08x\n",
1095 printk(KERN_DEFAULT " %08x %08x\n",
1096 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1099 printk(KERN_DEFAULT " %08x %08x %08x\n",
1100 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1101 be32_to_cpup(pos + 2));
1104 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1105 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1106 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1113 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1114 * @inode - pointer to inode
1115 * @fattr - attributes
1117 * Attempt to divine whether or not an RPC call reply carrying stale
1118 * attributes got scheduled after another call carrying updated ones.
1120 * To do so, the function first assumes that a more recent ctime means
1121 * that the attributes in fattr are newer, however it also attempt to
1122 * catch the case where ctime either didn't change, or went backwards
1123 * (if someone reset the clock on the server) by looking at whether
1124 * or not this RPC call was started after the inode was last updated.
1125 * Note also the check for wraparound of 'attr_gencount'
1127 * The function returns 'true' if it thinks the attributes in 'fattr' are
1128 * more recent than the ones cached in the inode.
1131 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1133 const struct nfs_inode *nfsi = NFS_I(inode);
1135 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1136 nfs_ctime_need_update(inode, fattr) ||
1137 nfs_size_need_update(inode, fattr) ||
1138 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1141 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1143 if (nfs_inode_attrs_need_update(inode, fattr))
1144 return nfs_update_inode(inode, fattr);
1145 return nfs_check_inode_attributes(inode, fattr);
1149 * nfs_refresh_inode - try to update the inode attribute cache
1150 * @inode - pointer to inode
1151 * @fattr - updated attributes
1153 * Check that an RPC call that returned attributes has not overlapped with
1154 * other recent updates of the inode metadata, then decide whether it is
1155 * safe to do a full update of the inode attributes, or whether just to
1156 * call nfs_check_inode_attributes.
1158 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1162 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1164 spin_lock(&inode->i_lock);
1165 status = nfs_refresh_inode_locked(inode, fattr);
1166 spin_unlock(&inode->i_lock);
1171 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1173 struct nfs_inode *nfsi = NFS_I(inode);
1175 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1176 if (S_ISDIR(inode->i_mode))
1177 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1178 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1180 return nfs_refresh_inode_locked(inode, fattr);
1184 * nfs_post_op_update_inode - try to update the inode attribute cache
1185 * @inode - pointer to inode
1186 * @fattr - updated attributes
1188 * After an operation that has changed the inode metadata, mark the
1189 * attribute cache as being invalid, then try to update it.
1191 * NB: if the server didn't return any post op attributes, this
1192 * function will force the retrieval of attributes before the next
1193 * NFS request. Thus it should be used only for operations that
1194 * are expected to change one or more attributes, to avoid
1195 * unnecessary NFS requests and trips through nfs_update_inode().
1197 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1201 spin_lock(&inode->i_lock);
1202 status = nfs_post_op_update_inode_locked(inode, fattr);
1203 spin_unlock(&inode->i_lock);
1208 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1209 * @inode - pointer to inode
1210 * @fattr - updated attributes
1212 * After an operation that has changed the inode metadata, mark the
1213 * attribute cache as being invalid, then try to update it. Fake up
1214 * weak cache consistency data, if none exist.
1216 * This function is mainly designed to be used by the ->write_done() functions.
1218 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1222 spin_lock(&inode->i_lock);
1223 /* Don't do a WCC update if these attributes are already stale */
1224 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1225 !nfs_inode_attrs_need_update(inode, fattr)) {
1226 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1227 | NFS_ATTR_FATTR_PRESIZE
1228 | NFS_ATTR_FATTR_PREMTIME
1229 | NFS_ATTR_FATTR_PRECTIME);
1232 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1233 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1234 fattr->pre_change_attr = inode->i_version;
1235 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1237 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1238 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1239 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1240 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1242 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1243 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1244 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1245 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1247 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1248 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1249 fattr->pre_size = i_size_read(inode);
1250 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1253 status = nfs_post_op_update_inode_locked(inode, fattr);
1254 spin_unlock(&inode->i_lock);
1259 * Many nfs protocol calls return the new file attributes after
1260 * an operation. Here we update the inode to reflect the state
1261 * of the server's inode.
1263 * This is a bit tricky because we have to make sure all dirty pages
1264 * have been sent off to the server before calling invalidate_inode_pages.
1265 * To make sure no other process adds more write requests while we try
1266 * our best to flush them, we make them sleep during the attribute refresh.
1268 * A very similar scenario holds for the dir cache.
1270 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1272 struct nfs_server *server;
1273 struct nfs_inode *nfsi = NFS_I(inode);
1274 loff_t cur_isize, new_isize;
1275 unsigned long invalid = 0;
1276 unsigned long now = jiffies;
1277 unsigned long save_cache_validity;
1279 dfprintk(VFS, "NFS: %s(%s/%ld fh_crc=0x%08x ct=%d info=0x%x)\n",
1280 __func__, inode->i_sb->s_id, inode->i_ino,
1281 nfs_display_fhandle_hash(NFS_FH(inode)),
1282 atomic_read(&inode->i_count), fattr->valid);
1284 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1285 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1286 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1287 NFS_SERVER(inode)->nfs_client->cl_hostname,
1288 inode->i_sb->s_id, (long long)nfsi->fileid,
1289 (long long)fattr->fileid);
1294 * Make sure the inode's type hasn't changed.
1296 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1298 * Big trouble! The inode has become a different object.
1300 printk(KERN_DEBUG "NFS: %s: inode %ld mode changed, %07o to %07o\n",
1301 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1305 server = NFS_SERVER(inode);
1306 /* Update the fsid? */
1307 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1308 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1309 !IS_AUTOMOUNT(inode))
1310 server->fsid = fattr->fsid;
1313 * Update the read time so we don't revalidate too often.
1315 nfsi->read_cache_jiffies = fattr->time_start;
1317 save_cache_validity = nfsi->cache_validity;
1318 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1319 | NFS_INO_INVALID_ATIME
1320 | NFS_INO_REVAL_FORCED
1321 | NFS_INO_REVAL_PAGECACHE);
1323 /* Do atomic weak cache consistency updates */
1324 invalid |= nfs_wcc_update_inode(inode, fattr);
1326 /* More cache consistency checks */
1327 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1328 if (inode->i_version != fattr->change_attr) {
1329 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1330 inode->i_sb->s_id, inode->i_ino);
1331 invalid |= NFS_INO_INVALID_ATTR
1332 | NFS_INO_INVALID_DATA
1333 | NFS_INO_INVALID_ACCESS
1334 | NFS_INO_INVALID_ACL
1335 | NFS_INO_REVAL_PAGECACHE;
1336 if (S_ISDIR(inode->i_mode))
1337 nfs_force_lookup_revalidate(inode);
1338 inode->i_version = fattr->change_attr;
1340 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1341 invalid |= save_cache_validity;
1343 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1344 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1345 } else if (server->caps & NFS_CAP_MTIME)
1346 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1347 | NFS_INO_REVAL_FORCED);
1349 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1350 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1351 } else if (server->caps & NFS_CAP_CTIME)
1352 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1353 | NFS_INO_REVAL_FORCED);
1355 /* Check if our cached file size is stale */
1356 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1357 new_isize = nfs_size_to_loff_t(fattr->size);
1358 cur_isize = i_size_read(inode);
1359 if (new_isize != cur_isize) {
1360 /* Do we perhaps have any outstanding writes, or has
1361 * the file grown beyond our last write? */
1362 if ((nfsi->npages == 0 && !test_bit(NFS_INO_LAYOUTCOMMIT, &nfsi->flags)) ||
1363 new_isize > cur_isize) {
1364 i_size_write(inode, new_isize);
1365 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1367 dprintk("NFS: isize change on server for file %s/%ld "
1371 (long long)cur_isize,
1372 (long long)new_isize);
1375 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1376 | NFS_INO_REVAL_PAGECACHE
1377 | NFS_INO_REVAL_FORCED);
1380 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1381 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1382 else if (server->caps & NFS_CAP_ATIME)
1383 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1384 | NFS_INO_REVAL_FORCED);
1386 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1387 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1388 umode_t newmode = inode->i_mode & S_IFMT;
1389 newmode |= fattr->mode & S_IALLUGO;
1390 inode->i_mode = newmode;
1391 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1393 } else if (server->caps & NFS_CAP_MODE)
1394 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1395 | NFS_INO_INVALID_ACCESS
1396 | NFS_INO_INVALID_ACL
1397 | NFS_INO_REVAL_FORCED);
1399 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1400 if (inode->i_uid != fattr->uid) {
1401 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1402 inode->i_uid = fattr->uid;
1404 } else if (server->caps & NFS_CAP_OWNER)
1405 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1406 | NFS_INO_INVALID_ACCESS
1407 | NFS_INO_INVALID_ACL
1408 | NFS_INO_REVAL_FORCED);
1410 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1411 if (inode->i_gid != fattr->gid) {
1412 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1413 inode->i_gid = fattr->gid;
1415 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1416 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1417 | NFS_INO_INVALID_ACCESS
1418 | NFS_INO_INVALID_ACL
1419 | NFS_INO_REVAL_FORCED);
1421 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1422 if (inode->i_nlink != fattr->nlink) {
1423 invalid |= NFS_INO_INVALID_ATTR;
1424 if (S_ISDIR(inode->i_mode))
1425 invalid |= NFS_INO_INVALID_DATA;
1426 set_nlink(inode, fattr->nlink);
1428 } else if (server->caps & NFS_CAP_NLINK)
1429 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1430 | NFS_INO_REVAL_FORCED);
1432 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1434 * report the blocks in 512byte units
1436 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1438 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1439 inode->i_blocks = fattr->du.nfs2.blocks;
1441 /* Update attrtimeo value if we're out of the unstable period */
1442 if (invalid & NFS_INO_INVALID_ATTR) {
1443 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1444 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1445 nfsi->attrtimeo_timestamp = now;
1446 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1448 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1449 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1450 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1451 nfsi->attrtimeo_timestamp = now;
1454 invalid &= ~NFS_INO_INVALID_ATTR;
1455 /* Don't invalidate the data if we were to blame */
1456 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1457 || S_ISLNK(inode->i_mode)))
1458 invalid &= ~NFS_INO_INVALID_DATA;
1459 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1460 (save_cache_validity & NFS_INO_REVAL_FORCED))
1461 nfsi->cache_validity |= invalid;
1466 * No need to worry about unhashing the dentry, as the
1467 * lookup validation will know that the inode is bad.
1468 * (But we fall through to invalidate the caches.)
1470 nfs_invalidate_inode(inode);
1475 #ifdef CONFIG_NFS_V4
1478 * Clean out any remaining NFSv4 state that might be left over due
1479 * to open() calls that passed nfs_atomic_lookup, but failed to call
1482 void nfs4_evict_inode(struct inode *inode)
1484 truncate_inode_pages(&inode->i_data, 0);
1486 pnfs_return_layout(inode);
1487 pnfs_destroy_layout(NFS_I(inode));
1488 /* If we are holding a delegation, return it! */
1489 nfs_inode_return_delegation_noreclaim(inode);
1490 /* First call standard NFS clear_inode() code */
1491 nfs_clear_inode(inode);
1495 struct inode *nfs_alloc_inode(struct super_block *sb)
1497 struct nfs_inode *nfsi;
1498 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1502 nfsi->cache_validity = 0UL;
1503 #ifdef CONFIG_NFS_V3_ACL
1504 nfsi->acl_access = ERR_PTR(-EAGAIN);
1505 nfsi->acl_default = ERR_PTR(-EAGAIN);
1507 #ifdef CONFIG_NFS_V4
1508 nfsi->nfs4_acl = NULL;
1509 #endif /* CONFIG_NFS_V4 */
1510 return &nfsi->vfs_inode;
1513 static void nfs_i_callback(struct rcu_head *head)
1515 struct inode *inode = container_of(head, struct inode, i_rcu);
1516 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1519 void nfs_destroy_inode(struct inode *inode)
1521 call_rcu(&inode->i_rcu, nfs_i_callback);
1524 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1526 #ifdef CONFIG_NFS_V4
1527 INIT_LIST_HEAD(&nfsi->open_states);
1528 nfsi->delegation = NULL;
1529 nfsi->delegation_state = 0;
1530 init_rwsem(&nfsi->rwsem);
1531 nfsi->layout = NULL;
1535 static void init_once(void *foo)
1537 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1539 inode_init_once(&nfsi->vfs_inode);
1540 INIT_LIST_HEAD(&nfsi->open_files);
1541 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1542 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1543 INIT_LIST_HEAD(&nfsi->commit_info.list);
1545 nfsi->commit_info.ncommit = 0;
1546 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1547 atomic_set(&nfsi->silly_count, 1);
1548 INIT_HLIST_HEAD(&nfsi->silly_list);
1549 init_waitqueue_head(&nfsi->waitqueue);
1550 nfs4_init_once(nfsi);
1553 static int __init nfs_init_inodecache(void)
1555 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1556 sizeof(struct nfs_inode),
1557 0, (SLAB_RECLAIM_ACCOUNT|
1560 if (nfs_inode_cachep == NULL)
1566 static void nfs_destroy_inodecache(void)
1568 kmem_cache_destroy(nfs_inode_cachep);
1571 struct workqueue_struct *nfsiod_workqueue;
1574 * start up the nfsiod workqueue
1576 static int nfsiod_start(void)
1578 struct workqueue_struct *wq;
1579 dprintk("RPC: creating workqueue nfsiod\n");
1580 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1583 nfsiod_workqueue = wq;
1588 * Destroy the nfsiod workqueue
1590 static void nfsiod_stop(void)
1592 struct workqueue_struct *wq;
1594 wq = nfsiod_workqueue;
1597 nfsiod_workqueue = NULL;
1598 destroy_workqueue(wq);
1602 EXPORT_SYMBOL_GPL(nfs_net_id);
1604 static int nfs_net_init(struct net *net)
1606 nfs_clients_init(net);
1607 return nfs_dns_resolver_cache_init(net);
1610 static void nfs_net_exit(struct net *net)
1612 nfs_dns_resolver_cache_destroy(net);
1613 nfs_cleanup_cb_ident_idr(net);
1616 static struct pernet_operations nfs_net_ops = {
1617 .init = nfs_net_init,
1618 .exit = nfs_net_exit,
1620 .size = sizeof(struct nfs_net),
1626 static int __init init_nfs_fs(void)
1630 err = nfs_dns_resolver_init();
1634 err = register_pernet_subsys(&nfs_net_ops);
1638 err = nfs_fscache_register();
1642 err = nfsiod_start();
1646 err = nfs_fs_proc_init();
1650 err = nfs_init_nfspagecache();
1654 err = nfs_init_inodecache();
1658 err = nfs_init_readpagecache();
1662 err = nfs_init_writepagecache();
1666 err = nfs_init_directcache();
1670 #ifdef CONFIG_PROC_FS
1671 rpc_proc_register(&init_net, &nfs_rpcstat);
1674 #ifdef CONFIG_NFS_V4
1675 err = init_nfs_v4();
1680 if ((err = register_nfs_fs()) != 0)
1685 #ifdef CONFIG_NFS_V4
1689 #ifdef CONFIG_PROC_FS
1690 rpc_proc_unregister(&init_net, "nfs");
1692 nfs_destroy_directcache();
1694 nfs_destroy_writepagecache();
1696 nfs_destroy_readpagecache();
1698 nfs_destroy_inodecache();
1700 nfs_destroy_nfspagecache();
1706 nfs_fscache_unregister();
1708 unregister_pernet_subsys(&nfs_net_ops);
1710 nfs_dns_resolver_destroy();
1715 static void __exit exit_nfs_fs(void)
1717 #ifdef CONFIG_NFS_V4
1720 nfs_destroy_directcache();
1721 nfs_destroy_writepagecache();
1722 nfs_destroy_readpagecache();
1723 nfs_destroy_inodecache();
1724 nfs_destroy_nfspagecache();
1725 nfs_fscache_unregister();
1726 unregister_pernet_subsys(&nfs_net_ops);
1727 nfs_dns_resolver_destroy();
1728 #ifdef CONFIG_PROC_FS
1729 rpc_proc_unregister(&init_net, "nfs");
1731 unregister_nfs_fs();
1736 /* Not quite true; I just maintain it */
1737 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1738 MODULE_LICENSE("GPL");
1739 module_param(enable_ino64, bool, 0644);
1741 module_init(init_nfs_fs)
1742 module_exit(exit_nfs_fs)