Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
[linux/fpc-iii.git] / fs / nfs / inode.c
blob28a0a3cbd3b7818ee255f3a3c57b738d098e48c3
1 /*
2 * linux/fs/nfs/inode.c
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>
21 #include <linux/mm.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38 #include <linux/slab.h>
39 #include <linux/compat.h>
40 #include <linux/freezer.h>
42 #include <asm/uaccess.h>
44 #include "nfs4_fs.h"
45 #include "callback.h"
46 #include "delegation.h"
47 #include "iostat.h"
48 #include "internal.h"
49 #include "fscache.h"
50 #include "pnfs.h"
51 #include "nfs.h"
52 #include "netns.h"
54 #include "nfstrace.h"
56 #define NFSDBG_FACILITY NFSDBG_VFS
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66 static struct kmem_cache * nfs_inode_cachep;
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 return nfs_fileid_to_ino_t(fattr->fileid);
74 /**
75 * nfs_wait_bit_killable - helper for functions that are sleeping on bit locks
76 * @word: long word containing the bit lock
78 int nfs_wait_bit_killable(void *word)
80 if (fatal_signal_pending(current))
81 return -ERESTARTSYS;
82 freezable_schedule_unsafe();
83 return 0;
85 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
87 /**
88 * nfs_compat_user_ino64 - returns the user-visible inode number
89 * @fileid: 64-bit fileid
91 * This function returns a 32-bit inode number if the boot parameter
92 * nfs.enable_ino64 is zero.
94 u64 nfs_compat_user_ino64(u64 fileid)
96 #ifdef CONFIG_COMPAT
97 compat_ulong_t ino;
98 #else
99 unsigned long ino;
100 #endif
102 if (enable_ino64)
103 return fileid;
104 ino = fileid;
105 if (sizeof(ino) < sizeof(fileid))
106 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107 return ino;
110 int nfs_drop_inode(struct inode *inode)
112 return NFS_STALE(inode) || generic_drop_inode(inode);
114 EXPORT_SYMBOL_GPL(nfs_drop_inode);
116 void nfs_clear_inode(struct inode *inode)
119 * The following should never happen...
121 WARN_ON_ONCE(nfs_have_writebacks(inode));
122 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
123 nfs_zap_acl_cache(inode);
124 nfs_access_zap_cache(inode);
125 nfs_fscache_clear_inode(inode);
127 EXPORT_SYMBOL_GPL(nfs_clear_inode);
129 void nfs_evict_inode(struct inode *inode)
131 truncate_inode_pages(&inode->i_data, 0);
132 clear_inode(inode);
133 nfs_clear_inode(inode);
137 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
139 int nfs_sync_mapping(struct address_space *mapping)
141 int ret = 0;
143 if (mapping->nrpages != 0) {
144 unmap_mapping_range(mapping, 0, 0, 0);
145 ret = nfs_wb_all(mapping->host);
147 return ret;
151 * Invalidate the local caches
153 static void nfs_zap_caches_locked(struct inode *inode)
155 struct nfs_inode *nfsi = NFS_I(inode);
156 int mode = inode->i_mode;
158 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
160 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
161 nfsi->attrtimeo_timestamp = jiffies;
163 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
164 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
165 nfs_fscache_invalidate(inode);
166 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
167 | NFS_INO_INVALID_LABEL
168 | NFS_INO_INVALID_DATA
169 | NFS_INO_INVALID_ACCESS
170 | NFS_INO_INVALID_ACL
171 | NFS_INO_REVAL_PAGECACHE;
172 } else
173 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
174 | NFS_INO_INVALID_LABEL
175 | NFS_INO_INVALID_ACCESS
176 | NFS_INO_INVALID_ACL
177 | NFS_INO_REVAL_PAGECACHE;
180 void nfs_zap_caches(struct inode *inode)
182 spin_lock(&inode->i_lock);
183 nfs_zap_caches_locked(inode);
184 spin_unlock(&inode->i_lock);
187 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
189 if (mapping->nrpages != 0) {
190 spin_lock(&inode->i_lock);
191 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA;
192 nfs_fscache_invalidate(inode);
193 spin_unlock(&inode->i_lock);
197 void nfs_zap_acl_cache(struct inode *inode)
199 void (*clear_acl_cache)(struct inode *);
201 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
202 if (clear_acl_cache != NULL)
203 clear_acl_cache(inode);
204 spin_lock(&inode->i_lock);
205 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
206 spin_unlock(&inode->i_lock);
208 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
210 void nfs_invalidate_atime(struct inode *inode)
212 spin_lock(&inode->i_lock);
213 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME;
214 spin_unlock(&inode->i_lock);
216 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
219 * Invalidate, but do not unhash, the inode.
220 * NB: must be called with inode->i_lock held!
222 static void nfs_invalidate_inode(struct inode *inode)
224 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
225 nfs_zap_caches_locked(inode);
228 struct nfs_find_desc {
229 struct nfs_fh *fh;
230 struct nfs_fattr *fattr;
234 * In NFSv3 we can have 64bit inode numbers. In order to support
235 * this, and re-exported directories (also seen in NFSv2)
236 * we are forced to allow 2 different inodes to have the same
237 * i_ino.
239 static int
240 nfs_find_actor(struct inode *inode, void *opaque)
242 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
243 struct nfs_fh *fh = desc->fh;
244 struct nfs_fattr *fattr = desc->fattr;
246 if (NFS_FILEID(inode) != fattr->fileid)
247 return 0;
248 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
249 return 0;
250 if (nfs_compare_fh(NFS_FH(inode), fh))
251 return 0;
252 if (is_bad_inode(inode) || NFS_STALE(inode))
253 return 0;
254 return 1;
257 static int
258 nfs_init_locked(struct inode *inode, void *opaque)
260 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
261 struct nfs_fattr *fattr = desc->fattr;
263 set_nfs_fileid(inode, fattr->fileid);
264 nfs_copy_fh(NFS_FH(inode), desc->fh);
265 return 0;
268 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
269 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
270 struct nfs4_label *label)
272 int error;
274 if (label == NULL)
275 return;
277 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
278 error = security_inode_notifysecctx(inode, label->label,
279 label->len);
280 if (error)
281 printk(KERN_ERR "%s() %s %d "
282 "security_inode_notifysecctx() %d\n",
283 __func__,
284 (char *)label->label,
285 label->len, error);
289 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
291 struct nfs4_label *label = NULL;
292 int minor_version = server->nfs_client->cl_minorversion;
294 if (minor_version < 2)
295 return label;
297 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
298 return label;
300 label = kzalloc(sizeof(struct nfs4_label), flags);
301 if (label == NULL)
302 return ERR_PTR(-ENOMEM);
304 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
305 if (label->label == NULL) {
306 kfree(label);
307 return ERR_PTR(-ENOMEM);
309 label->len = NFS4_MAXLABELLEN;
311 return label;
313 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
314 #else
315 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
316 struct nfs4_label *label)
319 #endif
320 EXPORT_SYMBOL_GPL(nfs_setsecurity);
323 * This is our front-end to iget that looks up inodes by file handle
324 * instead of inode number.
326 struct inode *
327 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
329 struct nfs_find_desc desc = {
330 .fh = fh,
331 .fattr = fattr
333 struct inode *inode = ERR_PTR(-ENOENT);
334 unsigned long hash;
336 nfs_attr_check_mountpoint(sb, fattr);
338 if (((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0) &&
339 !nfs_attr_use_mounted_on_fileid(fattr))
340 goto out_no_inode;
341 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
342 goto out_no_inode;
344 hash = nfs_fattr_to_ino_t(fattr);
346 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
347 if (inode == NULL) {
348 inode = ERR_PTR(-ENOMEM);
349 goto out_no_inode;
352 if (inode->i_state & I_NEW) {
353 struct nfs_inode *nfsi = NFS_I(inode);
354 unsigned long now = jiffies;
356 /* We set i_ino for the few things that still rely on it,
357 * such as stat(2) */
358 inode->i_ino = hash;
360 /* We can't support update_atime(), since the server will reset it */
361 inode->i_flags |= S_NOATIME|S_NOCMTIME;
362 inode->i_mode = fattr->mode;
363 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
364 && nfs_server_capable(inode, NFS_CAP_MODE))
365 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
366 /* Why so? Because we want revalidate for devices/FIFOs, and
367 * that's precisely what we have in nfs_file_inode_operations.
369 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
370 if (S_ISREG(inode->i_mode)) {
371 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
372 inode->i_data.a_ops = &nfs_file_aops;
373 inode->i_data.backing_dev_info = &NFS_SB(sb)->backing_dev_info;
374 } else if (S_ISDIR(inode->i_mode)) {
375 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
376 inode->i_fop = &nfs_dir_operations;
377 inode->i_data.a_ops = &nfs_dir_aops;
378 /* Deal with crossing mountpoints */
379 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
380 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
381 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
382 inode->i_op = &nfs_referral_inode_operations;
383 else
384 inode->i_op = &nfs_mountpoint_inode_operations;
385 inode->i_fop = NULL;
386 inode->i_flags |= S_AUTOMOUNT;
388 } else if (S_ISLNK(inode->i_mode))
389 inode->i_op = &nfs_symlink_inode_operations;
390 else
391 init_special_inode(inode, inode->i_mode, fattr->rdev);
393 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
394 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
395 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
396 inode->i_version = 0;
397 inode->i_size = 0;
398 clear_nlink(inode);
399 inode->i_uid = make_kuid(&init_user_ns, -2);
400 inode->i_gid = make_kgid(&init_user_ns, -2);
401 inode->i_blocks = 0;
402 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
403 nfsi->write_io = 0;
404 nfsi->read_io = 0;
406 nfsi->read_cache_jiffies = fattr->time_start;
407 nfsi->attr_gencount = fattr->gencount;
408 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
409 inode->i_atime = fattr->atime;
410 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
411 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
412 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
413 inode->i_mtime = fattr->mtime;
414 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
415 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
416 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
417 inode->i_ctime = fattr->ctime;
418 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
419 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
420 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
421 inode->i_version = fattr->change_attr;
422 else if (nfs_server_capable(inode, NFS_CAP_CHANGE_ATTR))
423 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
424 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
425 inode->i_size = nfs_size_to_loff_t(fattr->size);
426 else
427 nfsi->cache_validity |= NFS_INO_INVALID_ATTR
428 | NFS_INO_REVAL_PAGECACHE;
429 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
430 set_nlink(inode, fattr->nlink);
431 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
432 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
433 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
434 inode->i_uid = fattr->uid;
435 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
436 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
437 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
438 inode->i_gid = fattr->gid;
439 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
440 nfsi->cache_validity |= NFS_INO_INVALID_ATTR;
441 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
442 inode->i_blocks = fattr->du.nfs2.blocks;
443 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
445 * report the blocks in 512byte units
447 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
450 nfs_setsecurity(inode, fattr, label);
452 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
453 nfsi->attrtimeo_timestamp = now;
454 nfsi->access_cache = RB_ROOT;
456 nfs_fscache_init_inode(inode);
458 unlock_new_inode(inode);
459 } else
460 nfs_refresh_inode(inode, fattr);
461 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
462 inode->i_sb->s_id,
463 (unsigned long long)NFS_FILEID(inode),
464 nfs_display_fhandle_hash(fh),
465 atomic_read(&inode->i_count));
467 out:
468 return inode;
470 out_no_inode:
471 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
472 goto out;
474 EXPORT_SYMBOL_GPL(nfs_fhget);
476 #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)
479 nfs_setattr(struct dentry *dentry, struct iattr *attr)
481 struct inode *inode = dentry->d_inode;
482 struct nfs_fattr *fattr;
483 int error = -ENOMEM;
485 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
487 /* skip mode change if it's just for clearing setuid/setgid */
488 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
489 attr->ia_valid &= ~ATTR_MODE;
491 if (attr->ia_valid & ATTR_SIZE) {
492 if (!S_ISREG(inode->i_mode) || attr->ia_size == i_size_read(inode))
493 attr->ia_valid &= ~ATTR_SIZE;
496 /* Optimization: if the end result is no change, don't RPC */
497 attr->ia_valid &= NFS_VALID_ATTRS;
498 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
499 return 0;
501 trace_nfs_setattr_enter(inode);
503 /* Write all dirty data */
504 if (S_ISREG(inode->i_mode)) {
505 nfs_inode_dio_wait(inode);
506 nfs_wb_all(inode);
509 fattr = nfs_alloc_fattr();
510 if (fattr == NULL)
511 goto out;
513 * Return any delegations if we're going to change ACLs
515 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
516 NFS_PROTO(inode)->return_delegation(inode);
517 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
518 if (error == 0)
519 error = nfs_refresh_inode(inode, fattr);
520 nfs_free_fattr(fattr);
521 out:
522 trace_nfs_setattr_exit(inode, error);
523 return error;
525 EXPORT_SYMBOL_GPL(nfs_setattr);
528 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
529 * @inode: inode of the file used
530 * @offset: file offset to start truncating
532 * This is a copy of the common vmtruncate, but with the locking
533 * corrected to take into account the fact that NFS requires
534 * inode->i_size to be updated under the inode->i_lock.
536 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
538 int err;
540 err = inode_newsize_ok(inode, offset);
541 if (err)
542 goto out;
544 spin_lock(&inode->i_lock);
545 i_size_write(inode, offset);
546 spin_unlock(&inode->i_lock);
548 truncate_pagecache(inode, offset);
549 out:
550 return err;
554 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
555 * @inode: pointer to struct inode
556 * @attr: pointer to struct iattr
558 * Note: we do this in the *proc.c in order to ensure that
559 * it works for things like exclusive creates too.
561 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr)
563 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
564 spin_lock(&inode->i_lock);
565 if ((attr->ia_valid & ATTR_MODE) != 0) {
566 int mode = attr->ia_mode & S_IALLUGO;
567 mode |= inode->i_mode & ~S_IALLUGO;
568 inode->i_mode = mode;
570 if ((attr->ia_valid & ATTR_UID) != 0)
571 inode->i_uid = attr->ia_uid;
572 if ((attr->ia_valid & ATTR_GID) != 0)
573 inode->i_gid = attr->ia_gid;
574 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
575 spin_unlock(&inode->i_lock);
577 if ((attr->ia_valid & ATTR_SIZE) != 0) {
578 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
579 nfs_vmtruncate(inode, attr->ia_size);
582 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
584 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
586 struct inode *inode = dentry->d_inode;
587 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
588 int err;
590 trace_nfs_getattr_enter(inode);
591 /* Flush out writes to the server in order to update c/mtime. */
592 if (S_ISREG(inode->i_mode)) {
593 nfs_inode_dio_wait(inode);
594 err = filemap_write_and_wait(inode->i_mapping);
595 if (err)
596 goto out;
600 * We may force a getattr if the user cares about atime.
602 * Note that we only have to check the vfsmount flags here:
603 * - NFS always sets S_NOATIME by so checking it would give a
604 * bogus result
605 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
606 * no point in checking those.
608 if ((mnt->mnt_flags & MNT_NOATIME) ||
609 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
610 need_atime = 0;
612 if (need_atime)
613 err = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
614 else
615 err = nfs_revalidate_inode(NFS_SERVER(inode), inode);
616 if (!err) {
617 generic_fillattr(inode, stat);
618 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
620 out:
621 trace_nfs_getattr_exit(inode, err);
622 return err;
624 EXPORT_SYMBOL_GPL(nfs_getattr);
626 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
628 atomic_set(&l_ctx->count, 1);
629 l_ctx->lockowner.l_owner = current->files;
630 l_ctx->lockowner.l_pid = current->tgid;
631 INIT_LIST_HEAD(&l_ctx->list);
632 nfs_iocounter_init(&l_ctx->io_count);
635 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
637 struct nfs_lock_context *head = &ctx->lock_context;
638 struct nfs_lock_context *pos = head;
640 do {
641 if (pos->lockowner.l_owner != current->files)
642 continue;
643 if (pos->lockowner.l_pid != current->tgid)
644 continue;
645 atomic_inc(&pos->count);
646 return pos;
647 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
648 return NULL;
651 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
653 struct nfs_lock_context *res, *new = NULL;
654 struct inode *inode = ctx->dentry->d_inode;
656 spin_lock(&inode->i_lock);
657 res = __nfs_find_lock_context(ctx);
658 if (res == NULL) {
659 spin_unlock(&inode->i_lock);
660 new = kmalloc(sizeof(*new), GFP_KERNEL);
661 if (new == NULL)
662 return ERR_PTR(-ENOMEM);
663 nfs_init_lock_context(new);
664 spin_lock(&inode->i_lock);
665 res = __nfs_find_lock_context(ctx);
666 if (res == NULL) {
667 list_add_tail(&new->list, &ctx->lock_context.list);
668 new->open_context = ctx;
669 res = new;
670 new = NULL;
673 spin_unlock(&inode->i_lock);
674 kfree(new);
675 return res;
678 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
680 struct nfs_open_context *ctx = l_ctx->open_context;
681 struct inode *inode = ctx->dentry->d_inode;
683 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
684 return;
685 list_del(&l_ctx->list);
686 spin_unlock(&inode->i_lock);
687 kfree(l_ctx);
691 * nfs_close_context - Common close_context() routine NFSv2/v3
692 * @ctx: pointer to context
693 * @is_sync: is this a synchronous close
695 * always ensure that the attributes are up to date if we're mounted
696 * with close-to-open semantics
698 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
700 struct inode *inode;
701 struct nfs_server *server;
703 if (!(ctx->mode & FMODE_WRITE))
704 return;
705 if (!is_sync)
706 return;
707 inode = ctx->dentry->d_inode;
708 if (!list_empty(&NFS_I(inode)->open_files))
709 return;
710 server = NFS_SERVER(inode);
711 if (server->flags & NFS_MOUNT_NOCTO)
712 return;
713 nfs_revalidate_inode(server, inode);
715 EXPORT_SYMBOL_GPL(nfs_close_context);
717 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
719 struct nfs_open_context *ctx;
720 struct rpc_cred *cred = rpc_lookup_cred();
721 if (IS_ERR(cred))
722 return ERR_CAST(cred);
724 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
725 if (!ctx) {
726 put_rpccred(cred);
727 return ERR_PTR(-ENOMEM);
729 nfs_sb_active(dentry->d_sb);
730 ctx->dentry = dget(dentry);
731 ctx->cred = cred;
732 ctx->state = NULL;
733 ctx->mode = f_mode;
734 ctx->flags = 0;
735 ctx->error = 0;
736 nfs_init_lock_context(&ctx->lock_context);
737 ctx->lock_context.open_context = ctx;
738 INIT_LIST_HEAD(&ctx->list);
739 ctx->mdsthreshold = NULL;
740 return ctx;
742 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
744 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
746 if (ctx != NULL)
747 atomic_inc(&ctx->lock_context.count);
748 return ctx;
750 EXPORT_SYMBOL_GPL(get_nfs_open_context);
752 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
754 struct inode *inode = ctx->dentry->d_inode;
755 struct super_block *sb = ctx->dentry->d_sb;
757 if (!list_empty(&ctx->list)) {
758 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
759 return;
760 list_del(&ctx->list);
761 spin_unlock(&inode->i_lock);
762 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
763 return;
764 if (inode != NULL)
765 NFS_PROTO(inode)->close_context(ctx, is_sync);
766 if (ctx->cred != NULL)
767 put_rpccred(ctx->cred);
768 dput(ctx->dentry);
769 nfs_sb_deactive(sb);
770 kfree(ctx->mdsthreshold);
771 kfree(ctx);
774 void put_nfs_open_context(struct nfs_open_context *ctx)
776 __put_nfs_open_context(ctx, 0);
778 EXPORT_SYMBOL_GPL(put_nfs_open_context);
781 * Ensure that mmap has a recent RPC credential for use when writing out
782 * shared pages
784 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
786 struct inode *inode = ctx->dentry->d_inode;
787 struct nfs_inode *nfsi = NFS_I(inode);
789 spin_lock(&inode->i_lock);
790 list_add(&ctx->list, &nfsi->open_files);
791 spin_unlock(&inode->i_lock);
793 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
795 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
797 filp->private_data = get_nfs_open_context(ctx);
798 if (list_empty(&ctx->list))
799 nfs_inode_attach_open_context(ctx);
801 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
804 * Given an inode, search for an open context with the desired characteristics
806 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
808 struct nfs_inode *nfsi = NFS_I(inode);
809 struct nfs_open_context *pos, *ctx = NULL;
811 spin_lock(&inode->i_lock);
812 list_for_each_entry(pos, &nfsi->open_files, list) {
813 if (cred != NULL && pos->cred != cred)
814 continue;
815 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
816 continue;
817 ctx = get_nfs_open_context(pos);
818 break;
820 spin_unlock(&inode->i_lock);
821 return ctx;
824 static void nfs_file_clear_open_context(struct file *filp)
826 struct nfs_open_context *ctx = nfs_file_open_context(filp);
828 if (ctx) {
829 struct inode *inode = ctx->dentry->d_inode;
831 filp->private_data = NULL;
832 spin_lock(&inode->i_lock);
833 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
834 spin_unlock(&inode->i_lock);
835 __put_nfs_open_context(ctx, filp->f_flags & O_DIRECT ? 0 : 1);
840 * These allocate and release file read/write context information.
842 int nfs_open(struct inode *inode, struct file *filp)
844 struct nfs_open_context *ctx;
846 ctx = alloc_nfs_open_context(filp->f_path.dentry, filp->f_mode);
847 if (IS_ERR(ctx))
848 return PTR_ERR(ctx);
849 nfs_file_set_open_context(filp, ctx);
850 put_nfs_open_context(ctx);
851 nfs_fscache_open_file(inode, filp);
852 return 0;
855 int nfs_release(struct inode *inode, struct file *filp)
857 nfs_file_clear_open_context(filp);
858 return 0;
862 * This function is called whenever some part of NFS notices that
863 * the cached attributes have to be refreshed.
866 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
868 int status = -ESTALE;
869 struct nfs4_label *label = NULL;
870 struct nfs_fattr *fattr = NULL;
871 struct nfs_inode *nfsi = NFS_I(inode);
873 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
874 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
876 trace_nfs_revalidate_inode_enter(inode);
878 if (is_bad_inode(inode))
879 goto out;
880 if (NFS_STALE(inode))
881 goto out;
883 status = -ENOMEM;
884 fattr = nfs_alloc_fattr();
885 if (fattr == NULL)
886 goto out;
888 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
890 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
891 if (IS_ERR(label)) {
892 status = PTR_ERR(label);
893 goto out;
896 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
897 if (status != 0) {
898 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
899 inode->i_sb->s_id,
900 (unsigned 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);
906 goto err_out;
909 status = nfs_refresh_inode(inode, fattr);
910 if (status) {
911 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
912 inode->i_sb->s_id,
913 (unsigned long long)NFS_FILEID(inode), status);
914 goto err_out;
917 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
918 nfs_zap_acl_cache(inode);
920 nfs_setsecurity(inode, fattr, label);
922 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
923 inode->i_sb->s_id,
924 (unsigned long long)NFS_FILEID(inode));
926 err_out:
927 nfs4_label_free(label);
928 out:
929 nfs_free_fattr(fattr);
930 trace_nfs_revalidate_inode_exit(inode, status);
931 return status;
934 int nfs_attribute_timeout(struct inode *inode)
936 struct nfs_inode *nfsi = NFS_I(inode);
938 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
941 int nfs_attribute_cache_expired(struct inode *inode)
943 if (nfs_have_delegated_attributes(inode))
944 return 0;
945 return nfs_attribute_timeout(inode);
949 * nfs_revalidate_inode - Revalidate the inode attributes
950 * @server - pointer to nfs_server struct
951 * @inode - pointer to inode struct
953 * Updates inode attribute information by retrieving the data from the server.
955 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
957 if (!(NFS_I(inode)->cache_validity &
958 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
959 && !nfs_attribute_cache_expired(inode))
960 return NFS_STALE(inode) ? -ESTALE : 0;
961 return __nfs_revalidate_inode(server, inode);
963 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
965 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
967 struct nfs_inode *nfsi = NFS_I(inode);
968 int ret;
970 if (mapping->nrpages != 0) {
971 if (S_ISREG(inode->i_mode)) {
972 ret = nfs_sync_mapping(mapping);
973 if (ret < 0)
974 return ret;
976 ret = invalidate_inode_pages2(mapping);
977 if (ret < 0)
978 return ret;
980 if (S_ISDIR(inode->i_mode)) {
981 spin_lock(&inode->i_lock);
982 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
983 spin_unlock(&inode->i_lock);
985 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
986 nfs_fscache_wait_on_invalidate(inode);
988 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
989 inode->i_sb->s_id,
990 (unsigned long long)NFS_FILEID(inode));
991 return 0;
994 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
996 if (nfs_have_delegated_attributes(inode))
997 return false;
998 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
999 || nfs_attribute_timeout(inode)
1000 || NFS_STALE(inode);
1004 * nfs_revalidate_mapping - Revalidate the pagecache
1005 * @inode - pointer to host inode
1006 * @mapping - pointer to mapping
1008 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1010 struct nfs_inode *nfsi = NFS_I(inode);
1011 unsigned long *bitlock = &nfsi->flags;
1012 int ret = 0;
1014 /* swapfiles are not supposed to be shared. */
1015 if (IS_SWAPFILE(inode))
1016 goto out;
1018 if (nfs_mapping_need_revalidate_inode(inode)) {
1019 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1020 if (ret < 0)
1021 goto out;
1025 * We must clear NFS_INO_INVALID_DATA first to ensure that
1026 * invalidations that come in while we're shooting down the mappings
1027 * are respected. But, that leaves a race window where one revalidator
1028 * can clear the flag, and then another checks it before the mapping
1029 * gets invalidated. Fix that by serializing access to this part of
1030 * the function.
1032 * At the same time, we need to allow other tasks to see whether we
1033 * might be in the middle of invalidating the pages, so we only set
1034 * the bit lock here if it looks like we're going to be doing that.
1036 for (;;) {
1037 ret = wait_on_bit(bitlock, NFS_INO_INVALIDATING,
1038 nfs_wait_bit_killable, TASK_KILLABLE);
1039 if (ret)
1040 goto out;
1041 spin_lock(&inode->i_lock);
1042 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1043 spin_unlock(&inode->i_lock);
1044 continue;
1046 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1047 break;
1048 spin_unlock(&inode->i_lock);
1049 goto out;
1052 set_bit(NFS_INO_INVALIDATING, bitlock);
1053 smp_wmb();
1054 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1055 spin_unlock(&inode->i_lock);
1056 trace_nfs_invalidate_mapping_enter(inode);
1057 ret = nfs_invalidate_mapping(inode, mapping);
1058 trace_nfs_invalidate_mapping_exit(inode, ret);
1060 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1061 smp_mb__after_clear_bit();
1062 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1063 out:
1064 return ret;
1067 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1069 struct nfs_inode *nfsi = NFS_I(inode);
1070 unsigned long ret = 0;
1072 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1073 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1074 && inode->i_version == fattr->pre_change_attr) {
1075 inode->i_version = fattr->change_attr;
1076 if (S_ISDIR(inode->i_mode))
1077 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1078 ret |= NFS_INO_INVALID_ATTR;
1080 /* If we have atomic WCC data, we may update some attributes */
1081 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1082 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1083 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1084 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1085 ret |= NFS_INO_INVALID_ATTR;
1088 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1089 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1090 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1091 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1092 if (S_ISDIR(inode->i_mode))
1093 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1094 ret |= NFS_INO_INVALID_ATTR;
1096 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1097 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1098 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1099 && nfsi->npages == 0) {
1100 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1101 ret |= NFS_INO_INVALID_ATTR;
1104 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1105 nfs_fscache_invalidate(inode);
1107 return ret;
1111 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1112 * @inode - pointer to inode
1113 * @fattr - updated attributes
1115 * Verifies the attribute cache. If we have just changed the attributes,
1116 * so that fattr carries weak cache consistency data, then it may
1117 * also update the ctime/mtime/change_attribute.
1119 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1121 struct nfs_inode *nfsi = NFS_I(inode);
1122 loff_t cur_size, new_isize;
1123 unsigned long invalid = 0;
1126 if (nfs_have_delegated_attributes(inode))
1127 return 0;
1128 /* Has the inode gone and changed behind our back? */
1129 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1130 return -EIO;
1131 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1132 return -EIO;
1134 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1135 inode->i_version != fattr->change_attr)
1136 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1138 /* Verify a few of the more important attributes */
1139 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1140 invalid |= NFS_INO_INVALID_ATTR;
1142 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1143 cur_size = i_size_read(inode);
1144 new_isize = nfs_size_to_loff_t(fattr->size);
1145 if (cur_size != new_isize && nfsi->npages == 0)
1146 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1149 /* Have any file permissions changed? */
1150 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1151 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1152 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1153 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1154 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1155 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1157 /* Has the link count changed? */
1158 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1159 invalid |= NFS_INO_INVALID_ATTR;
1161 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1162 invalid |= NFS_INO_INVALID_ATIME;
1164 if (invalid != 0)
1165 nfsi->cache_validity |= invalid;
1167 nfsi->read_cache_jiffies = fattr->time_start;
1168 return 0;
1171 static int nfs_ctime_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1173 if (!(fattr->valid & NFS_ATTR_FATTR_CTIME))
1174 return 0;
1175 return timespec_compare(&fattr->ctime, &inode->i_ctime) > 0;
1178 static int nfs_size_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1180 if (!(fattr->valid & NFS_ATTR_FATTR_SIZE))
1181 return 0;
1182 return nfs_size_to_loff_t(fattr->size) > i_size_read(inode);
1185 static atomic_long_t nfs_attr_generation_counter;
1187 static unsigned long nfs_read_attr_generation_counter(void)
1189 return atomic_long_read(&nfs_attr_generation_counter);
1192 unsigned long nfs_inc_attr_generation_counter(void)
1194 return atomic_long_inc_return(&nfs_attr_generation_counter);
1197 void nfs_fattr_init(struct nfs_fattr *fattr)
1199 fattr->valid = 0;
1200 fattr->time_start = jiffies;
1201 fattr->gencount = nfs_inc_attr_generation_counter();
1202 fattr->owner_name = NULL;
1203 fattr->group_name = NULL;
1205 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1207 struct nfs_fattr *nfs_alloc_fattr(void)
1209 struct nfs_fattr *fattr;
1211 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1212 if (fattr != NULL)
1213 nfs_fattr_init(fattr);
1214 return fattr;
1216 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1218 struct nfs_fh *nfs_alloc_fhandle(void)
1220 struct nfs_fh *fh;
1222 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1223 if (fh != NULL)
1224 fh->size = 0;
1225 return fh;
1227 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1229 #ifdef NFS_DEBUG
1231 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1232 * in the same way that wireshark does
1234 * @fh: file handle
1236 * For debugging only.
1238 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1240 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1241 * not on the result */
1242 return nfs_fhandle_hash(fh);
1244 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1247 * _nfs_display_fhandle - display an NFS file handle on the console
1249 * @fh: file handle to display
1250 * @caption: display caption
1252 * For debugging only.
1254 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1256 unsigned short i;
1258 if (fh == NULL || fh->size == 0) {
1259 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1260 return;
1263 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1264 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1265 for (i = 0; i < fh->size; i += 16) {
1266 __be32 *pos = (__be32 *)&fh->data[i];
1268 switch ((fh->size - i - 1) >> 2) {
1269 case 0:
1270 printk(KERN_DEFAULT " %08x\n",
1271 be32_to_cpup(pos));
1272 break;
1273 case 1:
1274 printk(KERN_DEFAULT " %08x %08x\n",
1275 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1276 break;
1277 case 2:
1278 printk(KERN_DEFAULT " %08x %08x %08x\n",
1279 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1280 be32_to_cpup(pos + 2));
1281 break;
1282 default:
1283 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1284 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1285 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1289 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1290 #endif
1293 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1294 * @inode - pointer to inode
1295 * @fattr - attributes
1297 * Attempt to divine whether or not an RPC call reply carrying stale
1298 * attributes got scheduled after another call carrying updated ones.
1300 * To do so, the function first assumes that a more recent ctime means
1301 * that the attributes in fattr are newer, however it also attempt to
1302 * catch the case where ctime either didn't change, or went backwards
1303 * (if someone reset the clock on the server) by looking at whether
1304 * or not this RPC call was started after the inode was last updated.
1305 * Note also the check for wraparound of 'attr_gencount'
1307 * The function returns 'true' if it thinks the attributes in 'fattr' are
1308 * more recent than the ones cached in the inode.
1311 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1313 const struct nfs_inode *nfsi = NFS_I(inode);
1315 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1316 nfs_ctime_need_update(inode, fattr) ||
1317 nfs_size_need_update(inode, fattr) ||
1318 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1322 * Don't trust the change_attribute, mtime, ctime or size if
1323 * a pnfs LAYOUTCOMMIT is outstanding
1325 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1326 struct nfs_fattr *fattr)
1328 if (pnfs_layoutcommit_outstanding(inode))
1329 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1330 NFS_ATTR_FATTR_MTIME |
1331 NFS_ATTR_FATTR_CTIME |
1332 NFS_ATTR_FATTR_SIZE);
1335 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1337 int ret;
1339 trace_nfs_refresh_inode_enter(inode);
1341 nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1343 if (nfs_inode_attrs_need_update(inode, fattr))
1344 ret = nfs_update_inode(inode, fattr);
1345 else
1346 ret = nfs_check_inode_attributes(inode, fattr);
1348 trace_nfs_refresh_inode_exit(inode, ret);
1349 return ret;
1353 * nfs_refresh_inode - try to update the inode attribute cache
1354 * @inode - pointer to inode
1355 * @fattr - updated attributes
1357 * Check that an RPC call that returned attributes has not overlapped with
1358 * other recent updates of the inode metadata, then decide whether it is
1359 * safe to do a full update of the inode attributes, or whether just to
1360 * call nfs_check_inode_attributes.
1362 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1364 int status;
1366 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1367 return 0;
1368 spin_lock(&inode->i_lock);
1369 status = nfs_refresh_inode_locked(inode, fattr);
1370 spin_unlock(&inode->i_lock);
1372 return status;
1374 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1376 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1378 struct nfs_inode *nfsi = NFS_I(inode);
1380 nfsi->cache_validity |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1381 if (S_ISDIR(inode->i_mode)) {
1382 nfsi->cache_validity |= NFS_INO_INVALID_DATA;
1383 nfs_fscache_invalidate(inode);
1385 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1386 return 0;
1387 return nfs_refresh_inode_locked(inode, fattr);
1391 * nfs_post_op_update_inode - try to update the inode attribute cache
1392 * @inode - pointer to inode
1393 * @fattr - updated attributes
1395 * After an operation that has changed the inode metadata, mark the
1396 * attribute cache as being invalid, then try to update it.
1398 * NB: if the server didn't return any post op attributes, this
1399 * function will force the retrieval of attributes before the next
1400 * NFS request. Thus it should be used only for operations that
1401 * are expected to change one or more attributes, to avoid
1402 * unnecessary NFS requests and trips through nfs_update_inode().
1404 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1406 int status;
1408 spin_lock(&inode->i_lock);
1409 status = nfs_post_op_update_inode_locked(inode, fattr);
1410 spin_unlock(&inode->i_lock);
1412 return status;
1414 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1417 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1418 * @inode - pointer to inode
1419 * @fattr - updated attributes
1421 * After an operation that has changed the inode metadata, mark the
1422 * attribute cache as being invalid, then try to update it. Fake up
1423 * weak cache consistency data, if none exist.
1425 * This function is mainly designed to be used by the ->write_done() functions.
1427 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1429 int status;
1431 spin_lock(&inode->i_lock);
1432 /* Don't do a WCC update if these attributes are already stale */
1433 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1434 !nfs_inode_attrs_need_update(inode, fattr)) {
1435 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1436 | NFS_ATTR_FATTR_PRESIZE
1437 | NFS_ATTR_FATTR_PREMTIME
1438 | NFS_ATTR_FATTR_PRECTIME);
1439 goto out_noforce;
1441 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1442 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1443 fattr->pre_change_attr = inode->i_version;
1444 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1446 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1447 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1448 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1449 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1451 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1452 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1453 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1454 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1456 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1457 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1458 fattr->pre_size = i_size_read(inode);
1459 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1461 out_noforce:
1462 status = nfs_post_op_update_inode_locked(inode, fattr);
1463 spin_unlock(&inode->i_lock);
1464 return status;
1466 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1469 * Many nfs protocol calls return the new file attributes after
1470 * an operation. Here we update the inode to reflect the state
1471 * of the server's inode.
1473 * This is a bit tricky because we have to make sure all dirty pages
1474 * have been sent off to the server before calling invalidate_inode_pages.
1475 * To make sure no other process adds more write requests while we try
1476 * our best to flush them, we make them sleep during the attribute refresh.
1478 * A very similar scenario holds for the dir cache.
1480 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1482 struct nfs_server *server;
1483 struct nfs_inode *nfsi = NFS_I(inode);
1484 loff_t cur_isize, new_isize;
1485 unsigned long invalid = 0;
1486 unsigned long now = jiffies;
1487 unsigned long save_cache_validity;
1489 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1490 __func__, inode->i_sb->s_id, inode->i_ino,
1491 nfs_display_fhandle_hash(NFS_FH(inode)),
1492 atomic_read(&inode->i_count), fattr->valid);
1494 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) {
1495 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1496 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1497 NFS_SERVER(inode)->nfs_client->cl_hostname,
1498 inode->i_sb->s_id, (long long)nfsi->fileid,
1499 (long long)fattr->fileid);
1500 goto out_err;
1504 * Make sure the inode's type hasn't changed.
1506 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1508 * Big trouble! The inode has become a different object.
1510 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1511 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1512 goto out_err;
1515 server = NFS_SERVER(inode);
1516 /* Update the fsid? */
1517 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1518 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1519 !IS_AUTOMOUNT(inode))
1520 server->fsid = fattr->fsid;
1523 * Update the read time so we don't revalidate too often.
1525 nfsi->read_cache_jiffies = fattr->time_start;
1527 save_cache_validity = nfsi->cache_validity;
1528 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1529 | NFS_INO_INVALID_ATIME
1530 | NFS_INO_REVAL_FORCED
1531 | NFS_INO_REVAL_PAGECACHE);
1533 /* Do atomic weak cache consistency updates */
1534 invalid |= nfs_wcc_update_inode(inode, fattr);
1536 /* More cache consistency checks */
1537 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1538 if (inode->i_version != fattr->change_attr) {
1539 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1540 inode->i_sb->s_id, inode->i_ino);
1541 invalid |= NFS_INO_INVALID_ATTR
1542 | NFS_INO_INVALID_DATA
1543 | NFS_INO_INVALID_ACCESS
1544 | NFS_INO_INVALID_ACL
1545 | NFS_INO_REVAL_PAGECACHE;
1546 if (S_ISDIR(inode->i_mode))
1547 nfs_force_lookup_revalidate(inode);
1548 inode->i_version = fattr->change_attr;
1550 } else if (server->caps & NFS_CAP_CHANGE_ATTR)
1551 invalid |= save_cache_validity;
1553 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1554 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1555 } else if (server->caps & NFS_CAP_MTIME)
1556 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1557 | NFS_INO_REVAL_FORCED);
1559 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1560 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1561 } else if (server->caps & NFS_CAP_CTIME)
1562 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1563 | NFS_INO_REVAL_FORCED);
1565 /* Check if our cached file size is stale */
1566 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1567 new_isize = nfs_size_to_loff_t(fattr->size);
1568 cur_isize = i_size_read(inode);
1569 if (new_isize != cur_isize) {
1570 /* Do we perhaps have any outstanding writes, or has
1571 * the file grown beyond our last write? */
1572 if ((nfsi->npages == 0) || new_isize > cur_isize) {
1573 i_size_write(inode, new_isize);
1574 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1576 dprintk("NFS: isize change on server for file %s/%ld "
1577 "(%Ld to %Ld)\n",
1578 inode->i_sb->s_id,
1579 inode->i_ino,
1580 (long long)cur_isize,
1581 (long long)new_isize);
1583 } else
1584 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1585 | NFS_INO_REVAL_PAGECACHE
1586 | NFS_INO_REVAL_FORCED);
1589 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1590 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1591 else if (server->caps & NFS_CAP_ATIME)
1592 invalid |= save_cache_validity & (NFS_INO_INVALID_ATIME
1593 | NFS_INO_REVAL_FORCED);
1595 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1596 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1597 umode_t newmode = inode->i_mode & S_IFMT;
1598 newmode |= fattr->mode & S_IALLUGO;
1599 inode->i_mode = newmode;
1600 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1602 } else if (server->caps & NFS_CAP_MODE)
1603 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1604 | NFS_INO_INVALID_ACCESS
1605 | NFS_INO_INVALID_ACL
1606 | NFS_INO_REVAL_FORCED);
1608 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1609 if (!uid_eq(inode->i_uid, fattr->uid)) {
1610 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1611 inode->i_uid = fattr->uid;
1613 } else if (server->caps & NFS_CAP_OWNER)
1614 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1615 | NFS_INO_INVALID_ACCESS
1616 | NFS_INO_INVALID_ACL
1617 | NFS_INO_REVAL_FORCED);
1619 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1620 if (!gid_eq(inode->i_gid, fattr->gid)) {
1621 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1622 inode->i_gid = fattr->gid;
1624 } else if (server->caps & NFS_CAP_OWNER_GROUP)
1625 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1626 | NFS_INO_INVALID_ACCESS
1627 | NFS_INO_INVALID_ACL
1628 | NFS_INO_REVAL_FORCED);
1630 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1631 if (inode->i_nlink != fattr->nlink) {
1632 invalid |= NFS_INO_INVALID_ATTR;
1633 if (S_ISDIR(inode->i_mode))
1634 invalid |= NFS_INO_INVALID_DATA;
1635 set_nlink(inode, fattr->nlink);
1637 } else if (server->caps & NFS_CAP_NLINK)
1638 invalid |= save_cache_validity & (NFS_INO_INVALID_ATTR
1639 | NFS_INO_REVAL_FORCED);
1641 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1643 * report the blocks in 512byte units
1645 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1647 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1648 inode->i_blocks = fattr->du.nfs2.blocks;
1650 /* Update attrtimeo value if we're out of the unstable period */
1651 if (invalid & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL)) {
1652 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1653 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1654 nfsi->attrtimeo_timestamp = now;
1655 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1656 } else {
1657 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp, nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1658 if ((nfsi->attrtimeo <<= 1) > NFS_MAXATTRTIMEO(inode))
1659 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1660 nfsi->attrtimeo_timestamp = now;
1663 invalid &= ~NFS_INO_INVALID_ATTR;
1664 invalid &= ~NFS_INO_INVALID_LABEL;
1665 /* Don't invalidate the data if we were to blame */
1666 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1667 || S_ISLNK(inode->i_mode)))
1668 invalid &= ~NFS_INO_INVALID_DATA;
1669 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1670 (save_cache_validity & NFS_INO_REVAL_FORCED))
1671 nfsi->cache_validity |= invalid;
1673 if (invalid & NFS_INO_INVALID_DATA)
1674 nfs_fscache_invalidate(inode);
1676 return 0;
1677 out_err:
1679 * No need to worry about unhashing the dentry, as the
1680 * lookup validation will know that the inode is bad.
1681 * (But we fall through to invalidate the caches.)
1683 nfs_invalidate_inode(inode);
1684 return -ESTALE;
1687 struct inode *nfs_alloc_inode(struct super_block *sb)
1689 struct nfs_inode *nfsi;
1690 nfsi = (struct nfs_inode *)kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1691 if (!nfsi)
1692 return NULL;
1693 nfsi->flags = 0UL;
1694 nfsi->cache_validity = 0UL;
1695 #if IS_ENABLED(CONFIG_NFS_V4)
1696 nfsi->nfs4_acl = NULL;
1697 #endif /* CONFIG_NFS_V4 */
1698 return &nfsi->vfs_inode;
1700 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1702 static void nfs_i_callback(struct rcu_head *head)
1704 struct inode *inode = container_of(head, struct inode, i_rcu);
1705 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1708 void nfs_destroy_inode(struct inode *inode)
1710 call_rcu(&inode->i_rcu, nfs_i_callback);
1712 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1714 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1716 #if IS_ENABLED(CONFIG_NFS_V4)
1717 INIT_LIST_HEAD(&nfsi->open_states);
1718 nfsi->delegation = NULL;
1719 nfsi->delegation_state = 0;
1720 init_rwsem(&nfsi->rwsem);
1721 nfsi->layout = NULL;
1722 #endif
1725 static void init_once(void *foo)
1727 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1729 inode_init_once(&nfsi->vfs_inode);
1730 INIT_LIST_HEAD(&nfsi->open_files);
1731 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1732 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1733 INIT_LIST_HEAD(&nfsi->commit_info.list);
1734 nfsi->npages = 0;
1735 nfsi->commit_info.ncommit = 0;
1736 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1737 atomic_set(&nfsi->silly_count, 1);
1738 INIT_HLIST_HEAD(&nfsi->silly_list);
1739 init_waitqueue_head(&nfsi->waitqueue);
1740 nfs4_init_once(nfsi);
1743 static int __init nfs_init_inodecache(void)
1745 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1746 sizeof(struct nfs_inode),
1747 0, (SLAB_RECLAIM_ACCOUNT|
1748 SLAB_MEM_SPREAD),
1749 init_once);
1750 if (nfs_inode_cachep == NULL)
1751 return -ENOMEM;
1753 return 0;
1756 static void nfs_destroy_inodecache(void)
1759 * Make sure all delayed rcu free inodes are flushed before we
1760 * destroy cache.
1762 rcu_barrier();
1763 kmem_cache_destroy(nfs_inode_cachep);
1766 struct workqueue_struct *nfsiod_workqueue;
1767 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1770 * start up the nfsiod workqueue
1772 static int nfsiod_start(void)
1774 struct workqueue_struct *wq;
1775 dprintk("RPC: creating workqueue nfsiod\n");
1776 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1777 if (wq == NULL)
1778 return -ENOMEM;
1779 nfsiod_workqueue = wq;
1780 return 0;
1784 * Destroy the nfsiod workqueue
1786 static void nfsiod_stop(void)
1788 struct workqueue_struct *wq;
1790 wq = nfsiod_workqueue;
1791 if (wq == NULL)
1792 return;
1793 nfsiod_workqueue = NULL;
1794 destroy_workqueue(wq);
1797 int nfs_net_id;
1798 EXPORT_SYMBOL_GPL(nfs_net_id);
1800 static int nfs_net_init(struct net *net)
1802 nfs_clients_init(net);
1803 return 0;
1806 static void nfs_net_exit(struct net *net)
1808 nfs_cleanup_cb_ident_idr(net);
1811 static struct pernet_operations nfs_net_ops = {
1812 .init = nfs_net_init,
1813 .exit = nfs_net_exit,
1814 .id = &nfs_net_id,
1815 .size = sizeof(struct nfs_net),
1819 * Initialize NFS
1821 static int __init init_nfs_fs(void)
1823 int err;
1825 err = register_pernet_subsys(&nfs_net_ops);
1826 if (err < 0)
1827 goto out9;
1829 err = nfs_fscache_register();
1830 if (err < 0)
1831 goto out8;
1833 err = nfsiod_start();
1834 if (err)
1835 goto out7;
1837 err = nfs_fs_proc_init();
1838 if (err)
1839 goto out6;
1841 err = nfs_init_nfspagecache();
1842 if (err)
1843 goto out5;
1845 err = nfs_init_inodecache();
1846 if (err)
1847 goto out4;
1849 err = nfs_init_readpagecache();
1850 if (err)
1851 goto out3;
1853 err = nfs_init_writepagecache();
1854 if (err)
1855 goto out2;
1857 err = nfs_init_directcache();
1858 if (err)
1859 goto out1;
1861 #ifdef CONFIG_PROC_FS
1862 rpc_proc_register(&init_net, &nfs_rpcstat);
1863 #endif
1864 if ((err = register_nfs_fs()) != 0)
1865 goto out0;
1867 return 0;
1868 out0:
1869 #ifdef CONFIG_PROC_FS
1870 rpc_proc_unregister(&init_net, "nfs");
1871 #endif
1872 nfs_destroy_directcache();
1873 out1:
1874 nfs_destroy_writepagecache();
1875 out2:
1876 nfs_destroy_readpagecache();
1877 out3:
1878 nfs_destroy_inodecache();
1879 out4:
1880 nfs_destroy_nfspagecache();
1881 out5:
1882 nfs_fs_proc_exit();
1883 out6:
1884 nfsiod_stop();
1885 out7:
1886 nfs_fscache_unregister();
1887 out8:
1888 unregister_pernet_subsys(&nfs_net_ops);
1889 out9:
1890 return err;
1893 static void __exit exit_nfs_fs(void)
1895 nfs_destroy_directcache();
1896 nfs_destroy_writepagecache();
1897 nfs_destroy_readpagecache();
1898 nfs_destroy_inodecache();
1899 nfs_destroy_nfspagecache();
1900 nfs_fscache_unregister();
1901 unregister_pernet_subsys(&nfs_net_ops);
1902 #ifdef CONFIG_PROC_FS
1903 rpc_proc_unregister(&init_net, "nfs");
1904 #endif
1905 unregister_nfs_fs();
1906 nfs_fs_proc_exit();
1907 nfsiod_stop();
1910 /* Not quite true; I just maintain it */
1911 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
1912 MODULE_LICENSE("GPL");
1913 module_param(enable_ino64, bool, 0644);
1915 module_init(init_nfs_fs)
1916 module_exit(exit_nfs_fs)