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/signal.h>
19 #include <linux/time.h>
20 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38 #include <linux/slab.h>
39 #include <linux/compat.h>
40 #include <linux/freezer.h>
42 #include <linux/uaccess.h>
46 #include "delegation.h"
56 #define NFSDBG_FACILITY NFSDBG_VFS
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66 static struct kmem_cache * nfs_inode_cachep;
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 return nfs_fileid_to_ino_t(fattr->fileid);
74 static int nfs_wait_killable(int mode)
76 freezable_schedule_unsafe();
77 if (signal_pending_state(mode, current))
82 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84 return nfs_wait_killable(mode);
86 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
88 int nfs_wait_atomic_killable(atomic_t *p)
90 return nfs_wait_killable(TASK_KILLABLE);
94 * nfs_compat_user_ino64 - returns the user-visible inode number
95 * @fileid: 64-bit fileid
97 * This function returns a 32-bit inode number if the boot parameter
98 * nfs.enable_ino64 is zero.
100 u64 nfs_compat_user_ino64(u64 fileid)
111 if (sizeof(ino) < sizeof(fileid))
112 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
116 int nfs_drop_inode(struct inode *inode)
118 return NFS_STALE(inode) || generic_drop_inode(inode);
120 EXPORT_SYMBOL_GPL(nfs_drop_inode);
122 void nfs_clear_inode(struct inode *inode)
125 * The following should never happen...
127 WARN_ON_ONCE(nfs_have_writebacks(inode));
128 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
129 nfs_zap_acl_cache(inode);
130 nfs_access_zap_cache(inode);
131 nfs_fscache_clear_inode(inode);
133 EXPORT_SYMBOL_GPL(nfs_clear_inode);
135 void nfs_evict_inode(struct inode *inode)
137 truncate_inode_pages_final(&inode->i_data);
139 nfs_clear_inode(inode);
142 int nfs_sync_inode(struct inode *inode)
144 inode_dio_wait(inode);
145 return nfs_wb_all(inode);
147 EXPORT_SYMBOL_GPL(nfs_sync_inode);
150 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
152 int nfs_sync_mapping(struct address_space *mapping)
156 if (mapping->nrpages != 0) {
157 unmap_mapping_range(mapping, 0, 0, 0);
158 ret = nfs_wb_all(mapping->host);
163 static int nfs_attribute_timeout(struct inode *inode)
165 struct nfs_inode *nfsi = NFS_I(inode);
167 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
170 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
172 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
174 /* Special case for the pagecache or access cache */
175 if (flags == NFS_INO_REVAL_PAGECACHE &&
176 !(cache_validity & NFS_INO_REVAL_FORCED))
178 return (cache_validity & flags) != 0;
181 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
183 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
185 if ((cache_validity & flags) != 0)
187 if (nfs_attribute_timeout(inode))
192 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
194 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
195 return nfs_check_cache_invalid_delegated(inode, flags);
197 return nfs_check_cache_invalid_not_delegated(inode, flags);
200 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
202 struct nfs_inode *nfsi = NFS_I(inode);
204 if (inode->i_mapping->nrpages == 0)
205 flags &= ~NFS_INO_INVALID_DATA;
206 nfsi->cache_validity |= flags;
207 if (flags & NFS_INO_INVALID_DATA)
208 nfs_fscache_invalidate(inode);
212 * Invalidate the local caches
214 static void nfs_zap_caches_locked(struct inode *inode)
216 struct nfs_inode *nfsi = NFS_I(inode);
217 int mode = inode->i_mode;
219 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
221 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
222 nfsi->attrtimeo_timestamp = jiffies;
224 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
225 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
226 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
227 | NFS_INO_INVALID_DATA
228 | NFS_INO_INVALID_ACCESS
229 | NFS_INO_INVALID_ACL
230 | NFS_INO_REVAL_PAGECACHE);
232 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
233 | NFS_INO_INVALID_ACCESS
234 | NFS_INO_INVALID_ACL
235 | NFS_INO_REVAL_PAGECACHE);
236 nfs_zap_label_cache_locked(nfsi);
239 void nfs_zap_caches(struct inode *inode)
241 spin_lock(&inode->i_lock);
242 nfs_zap_caches_locked(inode);
243 spin_unlock(&inode->i_lock);
246 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
248 if (mapping->nrpages != 0) {
249 spin_lock(&inode->i_lock);
250 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
251 spin_unlock(&inode->i_lock);
255 void nfs_zap_acl_cache(struct inode *inode)
257 void (*clear_acl_cache)(struct inode *);
259 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
260 if (clear_acl_cache != NULL)
261 clear_acl_cache(inode);
262 spin_lock(&inode->i_lock);
263 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
264 spin_unlock(&inode->i_lock);
266 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
268 void nfs_invalidate_atime(struct inode *inode)
270 spin_lock(&inode->i_lock);
271 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
272 spin_unlock(&inode->i_lock);
274 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
277 * Invalidate, but do not unhash, the inode.
278 * NB: must be called with inode->i_lock held!
280 static void nfs_invalidate_inode(struct inode *inode)
282 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
283 nfs_zap_caches_locked(inode);
286 struct nfs_find_desc {
288 struct nfs_fattr *fattr;
292 * In NFSv3 we can have 64bit inode numbers. In order to support
293 * this, and re-exported directories (also seen in NFSv2)
294 * we are forced to allow 2 different inodes to have the same
298 nfs_find_actor(struct inode *inode, void *opaque)
300 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
301 struct nfs_fh *fh = desc->fh;
302 struct nfs_fattr *fattr = desc->fattr;
304 if (NFS_FILEID(inode) != fattr->fileid)
306 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
308 if (nfs_compare_fh(NFS_FH(inode), fh))
310 if (is_bad_inode(inode) || NFS_STALE(inode))
316 nfs_init_locked(struct inode *inode, void *opaque)
318 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
319 struct nfs_fattr *fattr = desc->fattr;
321 set_nfs_fileid(inode, fattr->fileid);
322 inode->i_mode = fattr->mode;
323 nfs_copy_fh(NFS_FH(inode), desc->fh);
327 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
328 static void nfs_clear_label_invalid(struct inode *inode)
330 spin_lock(&inode->i_lock);
331 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
332 spin_unlock(&inode->i_lock);
335 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
336 struct nfs4_label *label)
343 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
344 error = security_inode_notifysecctx(inode, label->label,
347 printk(KERN_ERR "%s() %s %d "
348 "security_inode_notifysecctx() %d\n",
350 (char *)label->label,
352 nfs_clear_label_invalid(inode);
356 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
358 struct nfs4_label *label = NULL;
359 int minor_version = server->nfs_client->cl_minorversion;
361 if (minor_version < 2)
364 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
367 label = kzalloc(sizeof(struct nfs4_label), flags);
369 return ERR_PTR(-ENOMEM);
371 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
372 if (label->label == NULL) {
374 return ERR_PTR(-ENOMEM);
376 label->len = NFS4_MAXLABELLEN;
380 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
382 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
383 struct nfs4_label *label)
387 EXPORT_SYMBOL_GPL(nfs_setsecurity);
389 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
391 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
393 struct nfs_find_desc desc = {
400 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
401 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
404 hash = nfs_fattr_to_ino_t(fattr);
405 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
407 dprintk("%s: returning %p\n", __func__, inode);
412 * This is our front-end to iget that looks up inodes by file handle
413 * instead of inode number.
416 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
418 struct nfs_find_desc desc = {
422 struct inode *inode = ERR_PTR(-ENOENT);
425 nfs_attr_check_mountpoint(sb, fattr);
427 if (nfs_attr_use_mounted_on_fileid(fattr))
428 fattr->fileid = fattr->mounted_on_fileid;
429 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
431 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
434 hash = nfs_fattr_to_ino_t(fattr);
436 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
438 inode = ERR_PTR(-ENOMEM);
442 if (inode->i_state & I_NEW) {
443 struct nfs_inode *nfsi = NFS_I(inode);
444 unsigned long now = jiffies;
446 /* We set i_ino for the few things that still rely on it,
450 /* We can't support update_atime(), since the server will reset it */
451 inode->i_flags |= S_NOATIME|S_NOCMTIME;
452 inode->i_mode = fattr->mode;
453 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
454 && nfs_server_capable(inode, NFS_CAP_MODE))
455 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
456 /* Why so? Because we want revalidate for devices/FIFOs, and
457 * that's precisely what we have in nfs_file_inode_operations.
459 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
460 if (S_ISREG(inode->i_mode)) {
461 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
462 inode->i_data.a_ops = &nfs_file_aops;
463 } else if (S_ISDIR(inode->i_mode)) {
464 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
465 inode->i_fop = &nfs_dir_operations;
466 inode->i_data.a_ops = &nfs_dir_aops;
467 /* Deal with crossing mountpoints */
468 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
469 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
470 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
471 inode->i_op = &nfs_referral_inode_operations;
473 inode->i_op = &nfs_mountpoint_inode_operations;
475 inode->i_flags |= S_AUTOMOUNT;
477 } else if (S_ISLNK(inode->i_mode)) {
478 inode->i_op = &nfs_symlink_inode_operations;
479 inode_nohighmem(inode);
481 init_special_inode(inode, inode->i_mode, fattr->rdev);
483 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
484 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
485 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
486 inode->i_version = 0;
489 inode->i_uid = make_kuid(&init_user_ns, -2);
490 inode->i_gid = make_kgid(&init_user_ns, -2);
492 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
496 nfsi->read_cache_jiffies = fattr->time_start;
497 nfsi->attr_gencount = fattr->gencount;
498 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
499 inode->i_atime = fattr->atime;
500 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
501 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
502 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
503 inode->i_mtime = fattr->mtime;
504 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
505 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
506 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
507 inode->i_ctime = fattr->ctime;
508 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
509 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
510 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
511 inode->i_version = fattr->change_attr;
513 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
514 | NFS_INO_REVAL_PAGECACHE);
515 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
516 inode->i_size = nfs_size_to_loff_t(fattr->size);
518 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
519 | NFS_INO_REVAL_PAGECACHE);
520 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
521 set_nlink(inode, fattr->nlink);
522 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
524 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
525 inode->i_uid = fattr->uid;
526 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
528 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
529 inode->i_gid = fattr->gid;
530 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
532 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
533 inode->i_blocks = fattr->du.nfs2.blocks;
534 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
536 * report the blocks in 512byte units
538 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
541 nfs_setsecurity(inode, fattr, label);
543 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
544 nfsi->attrtimeo_timestamp = now;
545 nfsi->access_cache = RB_ROOT;
547 nfs_fscache_init_inode(inode);
549 unlock_new_inode(inode);
551 int err = nfs_refresh_inode(inode, fattr);
554 inode = ERR_PTR(err);
558 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
560 (unsigned long long)NFS_FILEID(inode),
561 nfs_display_fhandle_hash(fh),
562 atomic_read(&inode->i_count));
568 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
571 EXPORT_SYMBOL_GPL(nfs_fhget);
573 #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)
576 nfs_setattr(struct dentry *dentry, struct iattr *attr)
578 struct inode *inode = d_inode(dentry);
579 struct nfs_fattr *fattr;
582 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
584 /* skip mode change if it's just for clearing setuid/setgid */
585 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
586 attr->ia_valid &= ~ATTR_MODE;
588 if (attr->ia_valid & ATTR_SIZE) {
589 BUG_ON(!S_ISREG(inode->i_mode));
591 error = inode_newsize_ok(inode, attr->ia_size);
595 if (attr->ia_size == i_size_read(inode))
596 attr->ia_valid &= ~ATTR_SIZE;
599 /* Optimization: if the end result is no change, don't RPC */
600 attr->ia_valid &= NFS_VALID_ATTRS;
601 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
604 trace_nfs_setattr_enter(inode);
606 /* Write all dirty data */
607 if (S_ISREG(inode->i_mode))
608 nfs_sync_inode(inode);
610 fattr = nfs_alloc_fattr();
617 * Return any delegations if we're going to change ACLs
619 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
620 NFS_PROTO(inode)->return_delegation(inode);
621 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
623 error = nfs_refresh_inode(inode, fattr);
624 nfs_free_fattr(fattr);
626 trace_nfs_setattr_exit(inode, error);
629 EXPORT_SYMBOL_GPL(nfs_setattr);
632 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
633 * @inode: inode of the file used
634 * @offset: file offset to start truncating
636 * This is a copy of the common vmtruncate, but with the locking
637 * corrected to take into account the fact that NFS requires
638 * inode->i_size to be updated under the inode->i_lock.
639 * Note: must be called with inode->i_lock held!
641 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
645 err = inode_newsize_ok(inode, offset);
649 i_size_write(inode, offset);
652 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
654 spin_unlock(&inode->i_lock);
655 truncate_pagecache(inode, offset);
656 spin_lock(&inode->i_lock);
662 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
663 * @inode: pointer to struct inode
664 * @attr: pointer to struct iattr
666 * Note: we do this in the *proc.c in order to ensure that
667 * it works for things like exclusive creates too.
669 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
670 struct nfs_fattr *fattr)
672 /* Barrier: bump the attribute generation count. */
673 nfs_fattr_set_barrier(fattr);
675 spin_lock(&inode->i_lock);
676 NFS_I(inode)->attr_gencount = fattr->gencount;
677 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
678 if ((attr->ia_valid & ATTR_MODE) != 0) {
679 int mode = attr->ia_mode & S_IALLUGO;
680 mode |= inode->i_mode & ~S_IALLUGO;
681 inode->i_mode = mode;
683 if ((attr->ia_valid & ATTR_UID) != 0)
684 inode->i_uid = attr->ia_uid;
685 if ((attr->ia_valid & ATTR_GID) != 0)
686 inode->i_gid = attr->ia_gid;
687 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
688 | NFS_INO_INVALID_ACL);
690 if ((attr->ia_valid & ATTR_SIZE) != 0) {
691 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
692 nfs_vmtruncate(inode, attr->ia_size);
695 nfs_update_inode(inode, fattr);
697 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
698 spin_unlock(&inode->i_lock);
700 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
702 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
704 struct dentry *parent;
706 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
708 parent = dget_parent(dentry);
709 nfs_force_use_readdirplus(d_inode(parent));
713 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
715 struct dentry *parent;
717 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
719 parent = dget_parent(dentry);
720 nfs_advise_use_readdirplus(d_inode(parent));
724 static bool nfs_need_revalidate_inode(struct inode *inode)
726 if (NFS_I(inode)->cache_validity &
727 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
729 if (nfs_attribute_cache_expired(inode))
734 int nfs_getattr(const struct path *path, struct kstat *stat,
735 u32 request_mask, unsigned int query_flags)
737 struct inode *inode = d_inode(path->dentry);
738 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
741 trace_nfs_getattr_enter(inode);
742 /* Flush out writes to the server in order to update c/mtime. */
743 if (S_ISREG(inode->i_mode))
744 filemap_write_and_wait(inode->i_mapping);
747 * We may force a getattr if the user cares about atime.
749 * Note that we only have to check the vfsmount flags here:
750 * - NFS always sets S_NOATIME by so checking it would give a
752 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
753 * no point in checking those.
755 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
756 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
759 if (need_atime || nfs_need_revalidate_inode(inode)) {
760 struct nfs_server *server = NFS_SERVER(inode);
762 if (!(server->flags & NFS_MOUNT_NOAC))
763 nfs_readdirplus_parent_cache_miss(path->dentry);
765 nfs_readdirplus_parent_cache_hit(path->dentry);
766 err = __nfs_revalidate_inode(server, inode);
768 nfs_readdirplus_parent_cache_hit(path->dentry);
770 generic_fillattr(inode, stat);
771 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
772 if (S_ISDIR(inode->i_mode))
773 stat->blksize = NFS_SERVER(inode)->dtsize;
776 trace_nfs_getattr_exit(inode, err);
779 EXPORT_SYMBOL_GPL(nfs_getattr);
781 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
783 atomic_set(&l_ctx->count, 1);
784 l_ctx->lockowner = current->files;
785 INIT_LIST_HEAD(&l_ctx->list);
786 atomic_set(&l_ctx->io_count, 0);
789 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
791 struct nfs_lock_context *head = &ctx->lock_context;
792 struct nfs_lock_context *pos = head;
795 if (pos->lockowner != current->files)
797 atomic_inc(&pos->count);
799 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
803 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
805 struct nfs_lock_context *res, *new = NULL;
806 struct inode *inode = d_inode(ctx->dentry);
808 spin_lock(&inode->i_lock);
809 res = __nfs_find_lock_context(ctx);
811 spin_unlock(&inode->i_lock);
812 new = kmalloc(sizeof(*new), GFP_KERNEL);
814 return ERR_PTR(-ENOMEM);
815 nfs_init_lock_context(new);
816 spin_lock(&inode->i_lock);
817 res = __nfs_find_lock_context(ctx);
819 list_add_tail(&new->list, &ctx->lock_context.list);
820 new->open_context = ctx;
825 spin_unlock(&inode->i_lock);
829 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
831 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
833 struct nfs_open_context *ctx = l_ctx->open_context;
834 struct inode *inode = d_inode(ctx->dentry);
836 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
838 list_del(&l_ctx->list);
839 spin_unlock(&inode->i_lock);
842 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
845 * nfs_close_context - Common close_context() routine NFSv2/v3
846 * @ctx: pointer to context
847 * @is_sync: is this a synchronous close
849 * Ensure that the attributes are up to date if we're mounted
850 * with close-to-open semantics and we have cached data that will
851 * need to be revalidated on open.
853 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
855 struct nfs_inode *nfsi;
857 struct nfs_server *server;
859 if (!(ctx->mode & FMODE_WRITE))
863 inode = d_inode(ctx->dentry);
864 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
867 if (inode->i_mapping->nrpages == 0)
869 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
871 if (!list_empty(&nfsi->open_files))
873 server = NFS_SERVER(inode);
874 if (server->flags & NFS_MOUNT_NOCTO)
876 nfs_revalidate_inode(server, inode);
878 EXPORT_SYMBOL_GPL(nfs_close_context);
880 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
884 struct nfs_open_context *ctx;
885 struct rpc_cred *cred = rpc_lookup_cred();
887 return ERR_CAST(cred);
889 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
892 return ERR_PTR(-ENOMEM);
894 nfs_sb_active(dentry->d_sb);
895 ctx->dentry = dget(dentry);
901 ctx->flock_owner = (fl_owner_t)filp;
902 nfs_init_lock_context(&ctx->lock_context);
903 ctx->lock_context.open_context = ctx;
904 INIT_LIST_HEAD(&ctx->list);
905 ctx->mdsthreshold = NULL;
908 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
910 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
913 atomic_inc(&ctx->lock_context.count);
916 EXPORT_SYMBOL_GPL(get_nfs_open_context);
918 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
920 struct inode *inode = d_inode(ctx->dentry);
921 struct super_block *sb = ctx->dentry->d_sb;
923 if (!list_empty(&ctx->list)) {
924 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
926 list_del(&ctx->list);
927 spin_unlock(&inode->i_lock);
928 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
931 NFS_PROTO(inode)->close_context(ctx, is_sync);
932 if (ctx->cred != NULL)
933 put_rpccred(ctx->cred);
936 kfree(ctx->mdsthreshold);
940 void put_nfs_open_context(struct nfs_open_context *ctx)
942 __put_nfs_open_context(ctx, 0);
944 EXPORT_SYMBOL_GPL(put_nfs_open_context);
946 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
948 __put_nfs_open_context(ctx, 1);
952 * Ensure that mmap has a recent RPC credential for use when writing out
955 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
957 struct inode *inode = d_inode(ctx->dentry);
958 struct nfs_inode *nfsi = NFS_I(inode);
960 spin_lock(&inode->i_lock);
961 if (ctx->mode & FMODE_WRITE)
962 list_add(&ctx->list, &nfsi->open_files);
964 list_add_tail(&ctx->list, &nfsi->open_files);
965 spin_unlock(&inode->i_lock);
967 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
969 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
971 filp->private_data = get_nfs_open_context(ctx);
972 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
973 if (list_empty(&ctx->list))
974 nfs_inode_attach_open_context(ctx);
976 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
979 * Given an inode, search for an open context with the desired characteristics
981 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
983 struct nfs_inode *nfsi = NFS_I(inode);
984 struct nfs_open_context *pos, *ctx = NULL;
986 spin_lock(&inode->i_lock);
987 list_for_each_entry(pos, &nfsi->open_files, list) {
988 if (cred != NULL && pos->cred != cred)
990 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
992 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
994 ctx = get_nfs_open_context(pos);
997 spin_unlock(&inode->i_lock);
1001 void nfs_file_clear_open_context(struct file *filp)
1003 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1006 struct inode *inode = d_inode(ctx->dentry);
1008 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1010 * We fatal error on write before. Try to writeback
1014 invalidate_inode_pages2(inode->i_mapping);
1015 filp->private_data = NULL;
1016 spin_lock(&inode->i_lock);
1017 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
1018 spin_unlock(&inode->i_lock);
1019 put_nfs_open_context_sync(ctx);
1024 * These allocate and release file read/write context information.
1026 int nfs_open(struct inode *inode, struct file *filp)
1028 struct nfs_open_context *ctx;
1030 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1032 return PTR_ERR(ctx);
1033 nfs_file_set_open_context(filp, ctx);
1034 put_nfs_open_context(ctx);
1035 nfs_fscache_open_file(inode, filp);
1038 EXPORT_SYMBOL_GPL(nfs_open);
1041 * This function is called whenever some part of NFS notices that
1042 * the cached attributes have to be refreshed.
1045 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1047 int status = -ESTALE;
1048 struct nfs4_label *label = NULL;
1049 struct nfs_fattr *fattr = NULL;
1050 struct nfs_inode *nfsi = NFS_I(inode);
1052 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1053 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1055 trace_nfs_revalidate_inode_enter(inode);
1057 if (is_bad_inode(inode))
1059 if (NFS_STALE(inode))
1062 /* pNFS: Attributes aren't updated until we layoutcommit */
1063 if (S_ISREG(inode->i_mode)) {
1064 status = pnfs_sync_inode(inode, false);
1070 fattr = nfs_alloc_fattr();
1074 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1076 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1077 if (IS_ERR(label)) {
1078 status = PTR_ERR(label);
1082 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
1084 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1086 (unsigned long long)NFS_FILEID(inode), status);
1087 if (status == -ESTALE) {
1088 nfs_zap_caches(inode);
1089 if (!S_ISDIR(inode->i_mode))
1090 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1095 status = nfs_refresh_inode(inode, fattr);
1097 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1099 (unsigned long long)NFS_FILEID(inode), status);
1103 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1104 nfs_zap_acl_cache(inode);
1106 nfs_setsecurity(inode, fattr, label);
1108 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1110 (unsigned long long)NFS_FILEID(inode));
1113 nfs4_label_free(label);
1115 nfs_free_fattr(fattr);
1116 trace_nfs_revalidate_inode_exit(inode, status);
1120 int nfs_attribute_cache_expired(struct inode *inode)
1122 if (nfs_have_delegated_attributes(inode))
1124 return nfs_attribute_timeout(inode);
1128 * nfs_revalidate_inode - Revalidate the inode attributes
1129 * @server - pointer to nfs_server struct
1130 * @inode - pointer to inode struct
1132 * Updates inode attribute information by retrieving the data from the server.
1134 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1136 if (!nfs_need_revalidate_inode(inode))
1137 return NFS_STALE(inode) ? -ESTALE : 0;
1138 return __nfs_revalidate_inode(server, inode);
1140 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1142 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1144 struct nfs_inode *nfsi = NFS_I(inode);
1147 if (mapping->nrpages != 0) {
1148 if (S_ISREG(inode->i_mode)) {
1149 unmap_mapping_range(mapping, 0, 0, 0);
1150 ret = nfs_sync_mapping(mapping);
1154 ret = invalidate_inode_pages2(mapping);
1158 if (S_ISDIR(inode->i_mode)) {
1159 spin_lock(&inode->i_lock);
1160 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1161 spin_unlock(&inode->i_lock);
1163 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1164 nfs_fscache_wait_on_invalidate(inode);
1166 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1168 (unsigned long long)NFS_FILEID(inode));
1172 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1174 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1178 int nfs_revalidate_mapping_rcu(struct inode *inode)
1180 struct nfs_inode *nfsi = NFS_I(inode);
1181 unsigned long *bitlock = &nfsi->flags;
1184 if (IS_SWAPFILE(inode))
1186 if (nfs_mapping_need_revalidate_inode(inode)) {
1190 spin_lock(&inode->i_lock);
1191 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1192 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1194 spin_unlock(&inode->i_lock);
1200 * nfs_revalidate_mapping - Revalidate the pagecache
1201 * @inode - pointer to host inode
1202 * @mapping - pointer to mapping
1204 int nfs_revalidate_mapping(struct inode *inode,
1205 struct address_space *mapping)
1207 struct nfs_inode *nfsi = NFS_I(inode);
1208 unsigned long *bitlock = &nfsi->flags;
1211 /* swapfiles are not supposed to be shared. */
1212 if (IS_SWAPFILE(inode))
1215 if (nfs_mapping_need_revalidate_inode(inode)) {
1216 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1222 * We must clear NFS_INO_INVALID_DATA first to ensure that
1223 * invalidations that come in while we're shooting down the mappings
1224 * are respected. But, that leaves a race window where one revalidator
1225 * can clear the flag, and then another checks it before the mapping
1226 * gets invalidated. Fix that by serializing access to this part of
1229 * At the same time, we need to allow other tasks to see whether we
1230 * might be in the middle of invalidating the pages, so we only set
1231 * the bit lock here if it looks like we're going to be doing that.
1234 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1235 nfs_wait_bit_killable, TASK_KILLABLE);
1238 spin_lock(&inode->i_lock);
1239 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1240 spin_unlock(&inode->i_lock);
1243 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1245 spin_unlock(&inode->i_lock);
1249 set_bit(NFS_INO_INVALIDATING, bitlock);
1251 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1252 spin_unlock(&inode->i_lock);
1253 trace_nfs_invalidate_mapping_enter(inode);
1254 ret = nfs_invalidate_mapping(inode, mapping);
1255 trace_nfs_invalidate_mapping_exit(inode, ret);
1257 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1258 smp_mb__after_atomic();
1259 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1264 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1266 struct inode *inode = &nfsi->vfs_inode;
1268 assert_spin_locked(&inode->i_lock);
1270 if (!S_ISREG(inode->i_mode))
1272 if (list_empty(&nfsi->open_files))
1274 /* Note: This relies on nfsi->open_files being ordered with writers
1275 * being placed at the head of the list.
1276 * See nfs_inode_attach_open_context()
1278 return (list_first_entry(&nfsi->open_files,
1279 struct nfs_open_context,
1280 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1283 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1285 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1288 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1290 unsigned long ret = 0;
1292 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1293 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1294 && inode->i_version == fattr->pre_change_attr) {
1295 inode->i_version = fattr->change_attr;
1296 if (S_ISDIR(inode->i_mode))
1297 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1298 ret |= NFS_INO_INVALID_ATTR;
1300 /* If we have atomic WCC data, we may update some attributes */
1301 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1302 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1303 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1304 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1305 ret |= NFS_INO_INVALID_ATTR;
1308 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1309 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1310 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1311 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1312 if (S_ISDIR(inode->i_mode))
1313 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1314 ret |= NFS_INO_INVALID_ATTR;
1316 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1317 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1318 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1319 && !nfs_have_writebacks(inode)) {
1320 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1321 ret |= NFS_INO_INVALID_ATTR;
1328 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1329 * @inode - pointer to inode
1330 * @fattr - updated attributes
1332 * Verifies the attribute cache. If we have just changed the attributes,
1333 * so that fattr carries weak cache consistency data, then it may
1334 * also update the ctime/mtime/change_attribute.
1336 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1338 struct nfs_inode *nfsi = NFS_I(inode);
1339 loff_t cur_size, new_isize;
1340 unsigned long invalid = 0;
1343 if (nfs_have_delegated_attributes(inode))
1345 /* Has the inode gone and changed behind our back? */
1346 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1348 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1351 if (!nfs_file_has_buffered_writers(nfsi)) {
1352 /* Verify a few of the more important attributes */
1353 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
1354 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1356 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1357 invalid |= NFS_INO_INVALID_ATTR;
1359 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1360 invalid |= NFS_INO_INVALID_ATTR;
1362 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1363 cur_size = i_size_read(inode);
1364 new_isize = nfs_size_to_loff_t(fattr->size);
1365 if (cur_size != new_isize)
1366 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1370 /* Have any file permissions changed? */
1371 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1372 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1373 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1374 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1375 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1376 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1378 /* Has the link count changed? */
1379 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1380 invalid |= NFS_INO_INVALID_ATTR;
1382 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1383 invalid |= NFS_INO_INVALID_ATIME;
1386 nfs_set_cache_invalid(inode, invalid | NFS_INO_REVAL_FORCED);
1388 nfsi->read_cache_jiffies = fattr->time_start;
1392 static atomic_long_t nfs_attr_generation_counter;
1394 static unsigned long nfs_read_attr_generation_counter(void)
1396 return atomic_long_read(&nfs_attr_generation_counter);
1399 unsigned long nfs_inc_attr_generation_counter(void)
1401 return atomic_long_inc_return(&nfs_attr_generation_counter);
1403 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1405 void nfs_fattr_init(struct nfs_fattr *fattr)
1408 fattr->time_start = jiffies;
1409 fattr->gencount = nfs_inc_attr_generation_counter();
1410 fattr->owner_name = NULL;
1411 fattr->group_name = NULL;
1413 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1416 * nfs_fattr_set_barrier
1417 * @fattr: attributes
1419 * Used to set a barrier after an attribute was updated. This
1420 * barrier ensures that older attributes from RPC calls that may
1421 * have raced with our update cannot clobber these new values.
1422 * Note that you are still responsible for ensuring that other
1423 * operations which change the attribute on the server do not
1426 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1428 fattr->gencount = nfs_inc_attr_generation_counter();
1431 struct nfs_fattr *nfs_alloc_fattr(void)
1433 struct nfs_fattr *fattr;
1435 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1437 nfs_fattr_init(fattr);
1440 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1442 struct nfs_fh *nfs_alloc_fhandle(void)
1446 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1451 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1455 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1456 * in the same way that wireshark does
1460 * For debugging only.
1462 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1464 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1465 * not on the result */
1466 return nfs_fhandle_hash(fh);
1468 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1471 * _nfs_display_fhandle - display an NFS file handle on the console
1473 * @fh: file handle to display
1474 * @caption: display caption
1476 * For debugging only.
1478 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1482 if (fh == NULL || fh->size == 0) {
1483 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1487 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1488 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1489 for (i = 0; i < fh->size; i += 16) {
1490 __be32 *pos = (__be32 *)&fh->data[i];
1492 switch ((fh->size - i - 1) >> 2) {
1494 printk(KERN_DEFAULT " %08x\n",
1498 printk(KERN_DEFAULT " %08x %08x\n",
1499 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1502 printk(KERN_DEFAULT " %08x %08x %08x\n",
1503 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1504 be32_to_cpup(pos + 2));
1507 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1508 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1509 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1513 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1517 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1518 * @inode - pointer to inode
1519 * @fattr - attributes
1521 * Attempt to divine whether or not an RPC call reply carrying stale
1522 * attributes got scheduled after another call carrying updated ones.
1524 * To do so, the function first assumes that a more recent ctime means
1525 * that the attributes in fattr are newer, however it also attempt to
1526 * catch the case where ctime either didn't change, or went backwards
1527 * (if someone reset the clock on the server) by looking at whether
1528 * or not this RPC call was started after the inode was last updated.
1529 * Note also the check for wraparound of 'attr_gencount'
1531 * The function returns 'true' if it thinks the attributes in 'fattr' are
1532 * more recent than the ones cached in the inode.
1535 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1537 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1539 return (long)(fattr->gencount - attr_gencount) > 0 ||
1540 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1543 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1547 trace_nfs_refresh_inode_enter(inode);
1549 if (nfs_inode_attrs_need_update(inode, fattr))
1550 ret = nfs_update_inode(inode, fattr);
1552 ret = nfs_check_inode_attributes(inode, fattr);
1554 trace_nfs_refresh_inode_exit(inode, ret);
1559 * nfs_refresh_inode - try to update the inode attribute cache
1560 * @inode - pointer to inode
1561 * @fattr - updated attributes
1563 * Check that an RPC call that returned attributes has not overlapped with
1564 * other recent updates of the inode metadata, then decide whether it is
1565 * safe to do a full update of the inode attributes, or whether just to
1566 * call nfs_check_inode_attributes.
1568 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1572 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1574 spin_lock(&inode->i_lock);
1575 status = nfs_refresh_inode_locked(inode, fattr);
1576 spin_unlock(&inode->i_lock);
1580 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1582 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1584 unsigned long invalid = NFS_INO_INVALID_ATTR;
1586 if (S_ISDIR(inode->i_mode))
1587 invalid |= NFS_INO_INVALID_DATA;
1588 nfs_set_cache_invalid(inode, invalid);
1589 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1591 return nfs_refresh_inode_locked(inode, fattr);
1595 * nfs_post_op_update_inode - try to update the inode attribute cache
1596 * @inode - pointer to inode
1597 * @fattr - updated attributes
1599 * After an operation that has changed the inode metadata, mark the
1600 * attribute cache as being invalid, then try to update it.
1602 * NB: if the server didn't return any post op attributes, this
1603 * function will force the retrieval of attributes before the next
1604 * NFS request. Thus it should be used only for operations that
1605 * are expected to change one or more attributes, to avoid
1606 * unnecessary NFS requests and trips through nfs_update_inode().
1608 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1612 spin_lock(&inode->i_lock);
1613 nfs_fattr_set_barrier(fattr);
1614 status = nfs_post_op_update_inode_locked(inode, fattr);
1615 spin_unlock(&inode->i_lock);
1619 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1622 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1623 * @inode - pointer to inode
1624 * @fattr - updated attributes
1626 * After an operation that has changed the inode metadata, mark the
1627 * attribute cache as being invalid, then try to update it. Fake up
1628 * weak cache consistency data, if none exist.
1630 * This function is mainly designed to be used by the ->write_done() functions.
1632 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1636 /* Don't do a WCC update if these attributes are already stale */
1637 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1638 !nfs_inode_attrs_need_update(inode, fattr)) {
1639 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1640 | NFS_ATTR_FATTR_PRESIZE
1641 | NFS_ATTR_FATTR_PREMTIME
1642 | NFS_ATTR_FATTR_PRECTIME);
1645 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1646 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1647 fattr->pre_change_attr = inode->i_version;
1648 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1650 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1651 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1652 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1653 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1655 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1656 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1657 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1658 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1660 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1661 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1662 fattr->pre_size = i_size_read(inode);
1663 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1666 status = nfs_post_op_update_inode_locked(inode, fattr);
1671 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1672 * @inode - pointer to inode
1673 * @fattr - updated attributes
1675 * After an operation that has changed the inode metadata, mark the
1676 * attribute cache as being invalid, then try to update it. Fake up
1677 * weak cache consistency data, if none exist.
1679 * This function is mainly designed to be used by the ->write_done() functions.
1681 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1685 spin_lock(&inode->i_lock);
1686 nfs_fattr_set_barrier(fattr);
1687 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1688 spin_unlock(&inode->i_lock);
1691 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1694 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1695 struct nfs_fattr *fattr)
1697 bool ret1 = true, ret2 = true;
1699 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1700 ret1 = (nfsi->fileid == fattr->fileid);
1701 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1702 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1703 return ret1 || ret2;
1707 * Many nfs protocol calls return the new file attributes after
1708 * an operation. Here we update the inode to reflect the state
1709 * of the server's inode.
1711 * This is a bit tricky because we have to make sure all dirty pages
1712 * have been sent off to the server before calling invalidate_inode_pages.
1713 * To make sure no other process adds more write requests while we try
1714 * our best to flush them, we make them sleep during the attribute refresh.
1716 * A very similar scenario holds for the dir cache.
1718 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1720 struct nfs_server *server;
1721 struct nfs_inode *nfsi = NFS_I(inode);
1722 loff_t cur_isize, new_isize;
1723 unsigned long invalid = 0;
1724 unsigned long now = jiffies;
1725 unsigned long save_cache_validity;
1726 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1727 bool cache_revalidated = true;
1729 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1730 __func__, inode->i_sb->s_id, inode->i_ino,
1731 nfs_display_fhandle_hash(NFS_FH(inode)),
1732 atomic_read(&inode->i_count), fattr->valid);
1734 if (!nfs_fileid_valid(nfsi, fattr)) {
1735 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1736 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1737 NFS_SERVER(inode)->nfs_client->cl_hostname,
1738 inode->i_sb->s_id, (long long)nfsi->fileid,
1739 (long long)fattr->fileid);
1744 * Make sure the inode's type hasn't changed.
1746 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1748 * Big trouble! The inode has become a different object.
1750 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1751 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1755 server = NFS_SERVER(inode);
1756 /* Update the fsid? */
1757 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1758 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1759 !IS_AUTOMOUNT(inode))
1760 server->fsid = fattr->fsid;
1763 * Update the read time so we don't revalidate too often.
1765 nfsi->read_cache_jiffies = fattr->time_start;
1767 save_cache_validity = nfsi->cache_validity;
1768 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1769 | NFS_INO_INVALID_ATIME
1770 | NFS_INO_REVAL_FORCED
1771 | NFS_INO_REVAL_PAGECACHE);
1773 /* Do atomic weak cache consistency updates */
1774 invalid |= nfs_wcc_update_inode(inode, fattr);
1776 if (pnfs_layoutcommit_outstanding(inode)) {
1777 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1778 cache_revalidated = false;
1781 /* More cache consistency checks */
1782 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1783 if (inode->i_version != fattr->change_attr) {
1784 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1785 inode->i_sb->s_id, inode->i_ino);
1786 /* Could it be a race with writeback? */
1787 if (!have_writers) {
1788 invalid |= NFS_INO_INVALID_ATTR
1789 | NFS_INO_INVALID_DATA
1790 | NFS_INO_INVALID_ACCESS
1791 | NFS_INO_INVALID_ACL;
1792 if (S_ISDIR(inode->i_mode))
1793 nfs_force_lookup_revalidate(inode);
1795 inode->i_version = fattr->change_attr;
1798 nfsi->cache_validity |= save_cache_validity;
1799 cache_revalidated = false;
1802 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1803 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1804 } else if (server->caps & NFS_CAP_MTIME) {
1805 nfsi->cache_validity |= save_cache_validity &
1806 (NFS_INO_INVALID_ATTR
1807 | NFS_INO_REVAL_FORCED);
1808 cache_revalidated = false;
1811 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1812 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1813 } else if (server->caps & NFS_CAP_CTIME) {
1814 nfsi->cache_validity |= save_cache_validity &
1815 (NFS_INO_INVALID_ATTR
1816 | NFS_INO_REVAL_FORCED);
1817 cache_revalidated = false;
1820 /* Check if our cached file size is stale */
1821 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1822 new_isize = nfs_size_to_loff_t(fattr->size);
1823 cur_isize = i_size_read(inode);
1824 if (new_isize != cur_isize) {
1825 /* Do we perhaps have any outstanding writes, or has
1826 * the file grown beyond our last write? */
1827 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1828 i_size_write(inode, new_isize);
1830 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1832 dprintk("NFS: isize change on server for file %s/%ld "
1836 (long long)cur_isize,
1837 (long long)new_isize);
1840 nfsi->cache_validity |= save_cache_validity &
1841 (NFS_INO_INVALID_ATTR
1842 | NFS_INO_REVAL_PAGECACHE
1843 | NFS_INO_REVAL_FORCED);
1844 cache_revalidated = false;
1848 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1849 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1850 else if (server->caps & NFS_CAP_ATIME) {
1851 nfsi->cache_validity |= save_cache_validity &
1852 (NFS_INO_INVALID_ATIME
1853 | NFS_INO_REVAL_FORCED);
1854 cache_revalidated = false;
1857 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1858 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1859 umode_t newmode = inode->i_mode & S_IFMT;
1860 newmode |= fattr->mode & S_IALLUGO;
1861 inode->i_mode = newmode;
1862 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1864 } else if (server->caps & NFS_CAP_MODE) {
1865 nfsi->cache_validity |= save_cache_validity &
1866 (NFS_INO_INVALID_ATTR
1867 | NFS_INO_INVALID_ACCESS
1868 | NFS_INO_INVALID_ACL
1869 | NFS_INO_REVAL_FORCED);
1870 cache_revalidated = false;
1873 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1874 if (!uid_eq(inode->i_uid, fattr->uid)) {
1875 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1876 inode->i_uid = fattr->uid;
1878 } else if (server->caps & NFS_CAP_OWNER) {
1879 nfsi->cache_validity |= save_cache_validity &
1880 (NFS_INO_INVALID_ATTR
1881 | NFS_INO_INVALID_ACCESS
1882 | NFS_INO_INVALID_ACL
1883 | NFS_INO_REVAL_FORCED);
1884 cache_revalidated = false;
1887 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1888 if (!gid_eq(inode->i_gid, fattr->gid)) {
1889 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1890 inode->i_gid = fattr->gid;
1892 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1893 nfsi->cache_validity |= save_cache_validity &
1894 (NFS_INO_INVALID_ATTR
1895 | NFS_INO_INVALID_ACCESS
1896 | NFS_INO_INVALID_ACL
1897 | NFS_INO_REVAL_FORCED);
1898 cache_revalidated = false;
1901 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1902 if (inode->i_nlink != fattr->nlink) {
1903 invalid |= NFS_INO_INVALID_ATTR;
1904 if (S_ISDIR(inode->i_mode))
1905 invalid |= NFS_INO_INVALID_DATA;
1906 set_nlink(inode, fattr->nlink);
1908 } else if (server->caps & NFS_CAP_NLINK) {
1909 nfsi->cache_validity |= save_cache_validity &
1910 (NFS_INO_INVALID_ATTR
1911 | NFS_INO_REVAL_FORCED);
1912 cache_revalidated = false;
1915 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1917 * report the blocks in 512byte units
1919 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1920 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1921 inode->i_blocks = fattr->du.nfs2.blocks;
1923 cache_revalidated = false;
1925 /* Update attrtimeo value if we're out of the unstable period */
1926 if (invalid & NFS_INO_INVALID_ATTR) {
1927 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1928 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1929 nfsi->attrtimeo_timestamp = now;
1930 /* Set barrier to be more recent than all outstanding updates */
1931 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1933 if (cache_revalidated) {
1934 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1935 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1936 nfsi->attrtimeo <<= 1;
1937 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1938 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1940 nfsi->attrtimeo_timestamp = now;
1942 /* Set the barrier to be more recent than this fattr */
1943 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
1944 nfsi->attr_gencount = fattr->gencount;
1947 /* Don't declare attrcache up to date if there were no attrs! */
1948 if (cache_revalidated)
1949 invalid &= ~NFS_INO_INVALID_ATTR;
1951 /* Don't invalidate the data if we were to blame */
1952 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1953 || S_ISLNK(inode->i_mode)))
1954 invalid &= ~NFS_INO_INVALID_DATA;
1955 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1956 (save_cache_validity & NFS_INO_REVAL_FORCED))
1957 nfs_set_cache_invalid(inode, invalid);
1962 * No need to worry about unhashing the dentry, as the
1963 * lookup validation will know that the inode is bad.
1964 * (But we fall through to invalidate the caches.)
1966 nfs_invalidate_inode(inode);
1970 struct inode *nfs_alloc_inode(struct super_block *sb)
1972 struct nfs_inode *nfsi;
1973 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1977 nfsi->cache_validity = 0UL;
1978 #if IS_ENABLED(CONFIG_NFS_V4)
1979 nfsi->nfs4_acl = NULL;
1980 #endif /* CONFIG_NFS_V4 */
1981 return &nfsi->vfs_inode;
1983 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1985 static void nfs_i_callback(struct rcu_head *head)
1987 struct inode *inode = container_of(head, struct inode, i_rcu);
1988 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1991 void nfs_destroy_inode(struct inode *inode)
1993 call_rcu(&inode->i_rcu, nfs_i_callback);
1995 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1997 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1999 #if IS_ENABLED(CONFIG_NFS_V4)
2000 INIT_LIST_HEAD(&nfsi->open_states);
2001 nfsi->delegation = NULL;
2002 init_rwsem(&nfsi->rwsem);
2003 nfsi->layout = NULL;
2007 static void init_once(void *foo)
2009 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2011 inode_init_once(&nfsi->vfs_inode);
2012 INIT_LIST_HEAD(&nfsi->open_files);
2013 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2014 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2015 INIT_LIST_HEAD(&nfsi->commit_info.list);
2016 atomic_long_set(&nfsi->nrequests, 0);
2017 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2018 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2019 init_rwsem(&nfsi->rmdir_sem);
2020 mutex_init(&nfsi->commit_mutex);
2021 nfs4_init_once(nfsi);
2024 static int __init nfs_init_inodecache(void)
2026 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2027 sizeof(struct nfs_inode),
2028 0, (SLAB_RECLAIM_ACCOUNT|
2029 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2031 if (nfs_inode_cachep == NULL)
2037 static void nfs_destroy_inodecache(void)
2040 * Make sure all delayed rcu free inodes are flushed before we
2044 kmem_cache_destroy(nfs_inode_cachep);
2047 struct workqueue_struct *nfsiod_workqueue;
2048 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2051 * start up the nfsiod workqueue
2053 static int nfsiod_start(void)
2055 struct workqueue_struct *wq;
2056 dprintk("RPC: creating workqueue nfsiod\n");
2057 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2060 nfsiod_workqueue = wq;
2065 * Destroy the nfsiod workqueue
2067 static void nfsiod_stop(void)
2069 struct workqueue_struct *wq;
2071 wq = nfsiod_workqueue;
2074 nfsiod_workqueue = NULL;
2075 destroy_workqueue(wq);
2078 unsigned int nfs_net_id;
2079 EXPORT_SYMBOL_GPL(nfs_net_id);
2081 static int nfs_net_init(struct net *net)
2083 nfs_clients_init(net);
2084 return nfs_fs_proc_net_init(net);
2087 static void nfs_net_exit(struct net *net)
2089 nfs_fs_proc_net_exit(net);
2090 nfs_cleanup_cb_ident_idr(net);
2093 static struct pernet_operations nfs_net_ops = {
2094 .init = nfs_net_init,
2095 .exit = nfs_net_exit,
2097 .size = sizeof(struct nfs_net),
2103 static int __init init_nfs_fs(void)
2107 err = register_pernet_subsys(&nfs_net_ops);
2111 err = nfs_fscache_register();
2115 err = nfsiod_start();
2119 err = nfs_fs_proc_init();
2123 err = nfs_init_nfspagecache();
2127 err = nfs_init_inodecache();
2131 err = nfs_init_readpagecache();
2135 err = nfs_init_writepagecache();
2139 err = nfs_init_directcache();
2143 rpc_proc_register(&init_net, &nfs_rpcstat);
2145 err = register_nfs_fs();
2151 rpc_proc_unregister(&init_net, "nfs");
2152 nfs_destroy_directcache();
2154 nfs_destroy_writepagecache();
2156 nfs_destroy_readpagecache();
2158 nfs_destroy_inodecache();
2160 nfs_destroy_nfspagecache();
2166 nfs_fscache_unregister();
2168 unregister_pernet_subsys(&nfs_net_ops);
2173 static void __exit exit_nfs_fs(void)
2175 nfs_destroy_directcache();
2176 nfs_destroy_writepagecache();
2177 nfs_destroy_readpagecache();
2178 nfs_destroy_inodecache();
2179 nfs_destroy_nfspagecache();
2180 nfs_fscache_unregister();
2181 unregister_pernet_subsys(&nfs_net_ops);
2182 rpc_proc_unregister(&init_net, "nfs");
2183 unregister_nfs_fs();
2188 /* Not quite true; I just maintain it */
2189 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2190 MODULE_LICENSE("GPL");
2191 module_param(enable_ino64, bool, 0644);
2193 module_init(init_nfs_fs)
2194 module_exit(exit_nfs_fs)