4 * Copyright (C) 1992 Rick Sladkey
6 * nfs inode and superblock handling functions
8 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
9 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
12 * J.S.Peatfield@damtp.cam.ac.uk
16 #include <linux/module.h>
17 #include <linux/init.h>
18 #include <linux/sched.h>
19 #include <linux/time.h>
20 #include <linux/kernel.h>
22 #include <linux/string.h>
23 #include <linux/stat.h>
24 #include <linux/errno.h>
25 #include <linux/unistd.h>
26 #include <linux/sunrpc/clnt.h>
27 #include <linux/sunrpc/stats.h>
28 #include <linux/sunrpc/metrics.h>
29 #include <linux/nfs_fs.h>
30 #include <linux/nfs_mount.h>
31 #include <linux/nfs4_mount.h>
32 #include <linux/lockd/bind.h>
33 #include <linux/seq_file.h>
34 #include <linux/mount.h>
35 #include <linux/vfs.h>
36 #include <linux/inet.h>
37 #include <linux/nfs_xdr.h>
38 #include <linux/slab.h>
39 #include <linux/compat.h>
40 #include <linux/freezer.h>
42 #include <asm/uaccess.h>
46 #include "delegation.h"
56 #define NFSDBG_FACILITY NFSDBG_VFS
58 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
60 /* Default is to see 64-bit inode numbers */
61 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
63 static void nfs_invalidate_inode(struct inode *);
64 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66 static struct kmem_cache * nfs_inode_cachep;
68 static inline unsigned long
69 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 return nfs_fileid_to_ino_t(fattr->fileid);
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 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
165 struct nfs_inode *nfsi = NFS_I(inode);
167 if (inode->i_mapping->nrpages == 0)
168 flags &= ~NFS_INO_INVALID_DATA;
169 nfsi->cache_validity |= flags;
170 if (flags & NFS_INO_INVALID_DATA)
171 nfs_fscache_invalidate(inode);
175 * Invalidate the local caches
177 static void nfs_zap_caches_locked(struct inode *inode)
179 struct nfs_inode *nfsi = NFS_I(inode);
180 int mode = inode->i_mode;
182 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
184 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
185 nfsi->attrtimeo_timestamp = jiffies;
187 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
188 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
189 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
190 | NFS_INO_INVALID_DATA
191 | NFS_INO_INVALID_ACCESS
192 | NFS_INO_INVALID_ACL
193 | NFS_INO_REVAL_PAGECACHE);
195 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
196 | NFS_INO_INVALID_ACCESS
197 | NFS_INO_INVALID_ACL
198 | NFS_INO_REVAL_PAGECACHE);
199 nfs_zap_label_cache_locked(nfsi);
202 void nfs_zap_caches(struct inode *inode)
204 spin_lock(&inode->i_lock);
205 nfs_zap_caches_locked(inode);
206 spin_unlock(&inode->i_lock);
209 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
211 if (mapping->nrpages != 0) {
212 spin_lock(&inode->i_lock);
213 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
214 spin_unlock(&inode->i_lock);
218 void nfs_zap_acl_cache(struct inode *inode)
220 void (*clear_acl_cache)(struct inode *);
222 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
223 if (clear_acl_cache != NULL)
224 clear_acl_cache(inode);
225 spin_lock(&inode->i_lock);
226 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
227 spin_unlock(&inode->i_lock);
229 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
231 void nfs_invalidate_atime(struct inode *inode)
233 spin_lock(&inode->i_lock);
234 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
235 spin_unlock(&inode->i_lock);
237 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
240 * Invalidate, but do not unhash, the inode.
241 * NB: must be called with inode->i_lock held!
243 static void nfs_invalidate_inode(struct inode *inode)
245 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
246 nfs_zap_caches_locked(inode);
249 struct nfs_find_desc {
251 struct nfs_fattr *fattr;
255 * In NFSv3 we can have 64bit inode numbers. In order to support
256 * this, and re-exported directories (also seen in NFSv2)
257 * we are forced to allow 2 different inodes to have the same
261 nfs_find_actor(struct inode *inode, void *opaque)
263 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
264 struct nfs_fh *fh = desc->fh;
265 struct nfs_fattr *fattr = desc->fattr;
267 if (NFS_FILEID(inode) != fattr->fileid)
269 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
271 if (nfs_compare_fh(NFS_FH(inode), fh))
273 if (is_bad_inode(inode) || NFS_STALE(inode))
279 nfs_init_locked(struct inode *inode, void *opaque)
281 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
282 struct nfs_fattr *fattr = desc->fattr;
284 set_nfs_fileid(inode, fattr->fileid);
285 inode->i_mode = fattr->mode;
286 nfs_copy_fh(NFS_FH(inode), desc->fh);
290 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
291 static void nfs_clear_label_invalid(struct inode *inode)
293 spin_lock(&inode->i_lock);
294 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
295 spin_unlock(&inode->i_lock);
298 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
299 struct nfs4_label *label)
306 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
307 error = security_inode_notifysecctx(inode, label->label,
310 printk(KERN_ERR "%s() %s %d "
311 "security_inode_notifysecctx() %d\n",
313 (char *)label->label,
315 nfs_clear_label_invalid(inode);
319 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
321 struct nfs4_label *label = NULL;
322 int minor_version = server->nfs_client->cl_minorversion;
324 if (minor_version < 2)
327 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
330 label = kzalloc(sizeof(struct nfs4_label), flags);
332 return ERR_PTR(-ENOMEM);
334 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
335 if (label->label == NULL) {
337 return ERR_PTR(-ENOMEM);
339 label->len = NFS4_MAXLABELLEN;
343 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
345 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
346 struct nfs4_label *label)
350 EXPORT_SYMBOL_GPL(nfs_setsecurity);
353 * This is our front-end to iget that looks up inodes by file handle
354 * instead of inode number.
357 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
359 struct nfs_find_desc desc = {
363 struct inode *inode = ERR_PTR(-ENOENT);
366 nfs_attr_check_mountpoint(sb, fattr);
368 if (nfs_attr_use_mounted_on_fileid(fattr))
369 fattr->fileid = fattr->mounted_on_fileid;
370 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
372 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
375 hash = nfs_fattr_to_ino_t(fattr);
377 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
379 inode = ERR_PTR(-ENOMEM);
383 if (inode->i_state & I_NEW) {
384 struct nfs_inode *nfsi = NFS_I(inode);
385 unsigned long now = jiffies;
387 /* We set i_ino for the few things that still rely on it,
391 /* We can't support update_atime(), since the server will reset it */
392 inode->i_flags |= S_NOATIME|S_NOCMTIME;
393 inode->i_mode = fattr->mode;
394 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
395 && nfs_server_capable(inode, NFS_CAP_MODE))
396 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
397 /* Why so? Because we want revalidate for devices/FIFOs, and
398 * that's precisely what we have in nfs_file_inode_operations.
400 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
401 if (S_ISREG(inode->i_mode)) {
402 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
403 inode->i_data.a_ops = &nfs_file_aops;
404 } else if (S_ISDIR(inode->i_mode)) {
405 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
406 inode->i_fop = &nfs_dir_operations;
407 inode->i_data.a_ops = &nfs_dir_aops;
408 /* Deal with crossing mountpoints */
409 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
410 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
411 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
412 inode->i_op = &nfs_referral_inode_operations;
414 inode->i_op = &nfs_mountpoint_inode_operations;
416 inode->i_flags |= S_AUTOMOUNT;
418 } else if (S_ISLNK(inode->i_mode)) {
419 inode->i_op = &nfs_symlink_inode_operations;
420 inode_nohighmem(inode);
422 init_special_inode(inode, inode->i_mode, fattr->rdev);
424 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
425 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
426 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
427 inode->i_version = 0;
430 inode->i_uid = make_kuid(&init_user_ns, -2);
431 inode->i_gid = make_kgid(&init_user_ns, -2);
433 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
437 nfsi->read_cache_jiffies = fattr->time_start;
438 nfsi->attr_gencount = fattr->gencount;
439 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
440 inode->i_atime = fattr->atime;
441 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
442 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
443 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
444 inode->i_mtime = fattr->mtime;
445 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
446 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
447 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
448 inode->i_ctime = fattr->ctime;
449 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
450 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
451 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
452 inode->i_version = fattr->change_attr;
454 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
455 | NFS_INO_REVAL_PAGECACHE);
456 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
457 inode->i_size = nfs_size_to_loff_t(fattr->size);
459 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
460 | NFS_INO_REVAL_PAGECACHE);
461 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
462 set_nlink(inode, fattr->nlink);
463 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
464 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
465 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
466 inode->i_uid = fattr->uid;
467 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
468 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
469 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
470 inode->i_gid = fattr->gid;
471 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
472 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR);
473 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
474 inode->i_blocks = fattr->du.nfs2.blocks;
475 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
477 * report the blocks in 512byte units
479 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
482 nfs_setsecurity(inode, fattr, label);
484 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
485 nfsi->attrtimeo_timestamp = now;
486 nfsi->access_cache = RB_ROOT;
488 nfs_fscache_init_inode(inode);
490 unlock_new_inode(inode);
492 nfs_refresh_inode(inode, fattr);
493 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
495 (unsigned long long)NFS_FILEID(inode),
496 nfs_display_fhandle_hash(fh),
497 atomic_read(&inode->i_count));
503 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
506 EXPORT_SYMBOL_GPL(nfs_fhget);
508 #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)
511 nfs_setattr(struct dentry *dentry, struct iattr *attr)
513 struct inode *inode = d_inode(dentry);
514 struct nfs_fattr *fattr;
517 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
519 /* skip mode change if it's just for clearing setuid/setgid */
520 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
521 attr->ia_valid &= ~ATTR_MODE;
523 if (attr->ia_valid & ATTR_SIZE) {
524 BUG_ON(!S_ISREG(inode->i_mode));
526 error = inode_newsize_ok(inode, attr->ia_size);
530 if (attr->ia_size == i_size_read(inode))
531 attr->ia_valid &= ~ATTR_SIZE;
534 /* Optimization: if the end result is no change, don't RPC */
535 attr->ia_valid &= NFS_VALID_ATTRS;
536 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
539 trace_nfs_setattr_enter(inode);
541 /* Write all dirty data */
542 if (S_ISREG(inode->i_mode))
543 nfs_sync_inode(inode);
545 fattr = nfs_alloc_fattr();
552 * Return any delegations if we're going to change ACLs
554 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0)
555 NFS_PROTO(inode)->return_delegation(inode);
556 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
558 error = nfs_refresh_inode(inode, fattr);
559 nfs_free_fattr(fattr);
561 trace_nfs_setattr_exit(inode, error);
564 EXPORT_SYMBOL_GPL(nfs_setattr);
567 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
568 * @inode: inode of the file used
569 * @offset: file offset to start truncating
571 * This is a copy of the common vmtruncate, but with the locking
572 * corrected to take into account the fact that NFS requires
573 * inode->i_size to be updated under the inode->i_lock.
574 * Note: must be called with inode->i_lock held!
576 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
580 err = inode_newsize_ok(inode, offset);
584 i_size_write(inode, offset);
587 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
589 spin_unlock(&inode->i_lock);
590 truncate_pagecache(inode, offset);
591 spin_lock(&inode->i_lock);
597 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
598 * @inode: pointer to struct inode
599 * @attr: pointer to struct iattr
601 * Note: we do this in the *proc.c in order to ensure that
602 * it works for things like exclusive creates too.
604 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
605 struct nfs_fattr *fattr)
607 /* Barrier: bump the attribute generation count. */
608 nfs_fattr_set_barrier(fattr);
610 spin_lock(&inode->i_lock);
611 NFS_I(inode)->attr_gencount = fattr->gencount;
612 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
613 if ((attr->ia_valid & ATTR_MODE) != 0) {
614 int mode = attr->ia_mode & S_IALLUGO;
615 mode |= inode->i_mode & ~S_IALLUGO;
616 inode->i_mode = mode;
618 if ((attr->ia_valid & ATTR_UID) != 0)
619 inode->i_uid = attr->ia_uid;
620 if ((attr->ia_valid & ATTR_GID) != 0)
621 inode->i_gid = attr->ia_gid;
622 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
623 | NFS_INO_INVALID_ACL);
625 if ((attr->ia_valid & ATTR_SIZE) != 0) {
626 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
627 nfs_vmtruncate(inode, attr->ia_size);
630 nfs_update_inode(inode, fattr);
632 NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATTR;
633 spin_unlock(&inode->i_lock);
635 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
637 static void nfs_request_parent_use_readdirplus(struct dentry *dentry)
639 struct dentry *parent;
641 parent = dget_parent(dentry);
642 nfs_force_use_readdirplus(d_inode(parent));
646 static bool nfs_need_revalidate_inode(struct inode *inode)
648 if (NFS_I(inode)->cache_validity &
649 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
651 if (nfs_attribute_cache_expired(inode))
656 int nfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
658 struct inode *inode = d_inode(dentry);
659 int need_atime = NFS_I(inode)->cache_validity & NFS_INO_INVALID_ATIME;
662 trace_nfs_getattr_enter(inode);
663 /* Flush out writes to the server in order to update c/mtime. */
664 if (S_ISREG(inode->i_mode))
665 filemap_write_and_wait(inode->i_mapping);
668 * We may force a getattr if the user cares about atime.
670 * Note that we only have to check the vfsmount flags here:
671 * - NFS always sets S_NOATIME by so checking it would give a
673 * - NFS never sets MS_NOATIME or MS_NODIRATIME so there is
674 * no point in checking those.
676 if ((mnt->mnt_flags & MNT_NOATIME) ||
677 ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
680 if (need_atime || nfs_need_revalidate_inode(inode)) {
681 struct nfs_server *server = NFS_SERVER(inode);
683 if (server->caps & NFS_CAP_READDIRPLUS)
684 nfs_request_parent_use_readdirplus(dentry);
685 err = __nfs_revalidate_inode(server, inode);
688 generic_fillattr(inode, stat);
689 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
690 if (S_ISDIR(inode->i_mode))
691 stat->blksize = NFS_SERVER(inode)->dtsize;
694 trace_nfs_getattr_exit(inode, err);
697 EXPORT_SYMBOL_GPL(nfs_getattr);
699 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
701 atomic_set(&l_ctx->count, 1);
702 l_ctx->lockowner.l_owner = current->files;
703 l_ctx->lockowner.l_pid = current->tgid;
704 INIT_LIST_HEAD(&l_ctx->list);
705 atomic_set(&l_ctx->io_count, 0);
708 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
710 struct nfs_lock_context *head = &ctx->lock_context;
711 struct nfs_lock_context *pos = head;
714 if (pos->lockowner.l_owner != current->files)
716 if (pos->lockowner.l_pid != current->tgid)
718 atomic_inc(&pos->count);
720 } while ((pos = list_entry(pos->list.next, typeof(*pos), list)) != head);
724 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
726 struct nfs_lock_context *res, *new = NULL;
727 struct inode *inode = d_inode(ctx->dentry);
729 spin_lock(&inode->i_lock);
730 res = __nfs_find_lock_context(ctx);
732 spin_unlock(&inode->i_lock);
733 new = kmalloc(sizeof(*new), GFP_KERNEL);
735 return ERR_PTR(-ENOMEM);
736 nfs_init_lock_context(new);
737 spin_lock(&inode->i_lock);
738 res = __nfs_find_lock_context(ctx);
740 list_add_tail(&new->list, &ctx->lock_context.list);
741 new->open_context = ctx;
746 spin_unlock(&inode->i_lock);
750 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
752 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
754 struct nfs_open_context *ctx = l_ctx->open_context;
755 struct inode *inode = d_inode(ctx->dentry);
757 if (!atomic_dec_and_lock(&l_ctx->count, &inode->i_lock))
759 list_del(&l_ctx->list);
760 spin_unlock(&inode->i_lock);
763 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
766 * nfs_close_context - Common close_context() routine NFSv2/v3
767 * @ctx: pointer to context
768 * @is_sync: is this a synchronous close
770 * Ensure that the attributes are up to date if we're mounted
771 * with close-to-open semantics and we have cached data that will
772 * need to be revalidated on open.
774 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
776 struct nfs_inode *nfsi;
778 struct nfs_server *server;
780 if (!(ctx->mode & FMODE_WRITE))
784 inode = d_inode(ctx->dentry);
786 if (inode->i_mapping->nrpages == 0)
788 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
790 if (!list_empty(&nfsi->open_files))
792 server = NFS_SERVER(inode);
793 if (server->flags & NFS_MOUNT_NOCTO)
795 nfs_revalidate_inode(server, inode);
797 EXPORT_SYMBOL_GPL(nfs_close_context);
799 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry, fmode_t f_mode)
801 struct nfs_open_context *ctx;
802 struct rpc_cred *cred = rpc_lookup_cred();
804 return ERR_CAST(cred);
806 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
809 return ERR_PTR(-ENOMEM);
811 nfs_sb_active(dentry->d_sb);
812 ctx->dentry = dget(dentry);
818 nfs_init_lock_context(&ctx->lock_context);
819 ctx->lock_context.open_context = ctx;
820 INIT_LIST_HEAD(&ctx->list);
821 ctx->mdsthreshold = NULL;
824 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
826 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
829 atomic_inc(&ctx->lock_context.count);
832 EXPORT_SYMBOL_GPL(get_nfs_open_context);
834 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
836 struct inode *inode = d_inode(ctx->dentry);
837 struct super_block *sb = ctx->dentry->d_sb;
839 if (!list_empty(&ctx->list)) {
840 if (!atomic_dec_and_lock(&ctx->lock_context.count, &inode->i_lock))
842 list_del(&ctx->list);
843 spin_unlock(&inode->i_lock);
844 } else if (!atomic_dec_and_test(&ctx->lock_context.count))
847 NFS_PROTO(inode)->close_context(ctx, is_sync);
848 if (ctx->cred != NULL)
849 put_rpccred(ctx->cred);
852 kfree(ctx->mdsthreshold);
856 void put_nfs_open_context(struct nfs_open_context *ctx)
858 __put_nfs_open_context(ctx, 0);
860 EXPORT_SYMBOL_GPL(put_nfs_open_context);
862 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
864 __put_nfs_open_context(ctx, 1);
868 * Ensure that mmap has a recent RPC credential for use when writing out
871 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
873 struct inode *inode = d_inode(ctx->dentry);
874 struct nfs_inode *nfsi = NFS_I(inode);
876 spin_lock(&inode->i_lock);
877 if (ctx->mode & FMODE_WRITE)
878 list_add(&ctx->list, &nfsi->open_files);
880 list_add_tail(&ctx->list, &nfsi->open_files);
881 spin_unlock(&inode->i_lock);
883 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
885 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
887 filp->private_data = get_nfs_open_context(ctx);
888 if (list_empty(&ctx->list))
889 nfs_inode_attach_open_context(ctx);
891 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
894 * Given an inode, search for an open context with the desired characteristics
896 struct nfs_open_context *nfs_find_open_context(struct inode *inode, struct rpc_cred *cred, fmode_t mode)
898 struct nfs_inode *nfsi = NFS_I(inode);
899 struct nfs_open_context *pos, *ctx = NULL;
901 spin_lock(&inode->i_lock);
902 list_for_each_entry(pos, &nfsi->open_files, list) {
903 if (cred != NULL && pos->cred != cred)
905 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
907 ctx = get_nfs_open_context(pos);
910 spin_unlock(&inode->i_lock);
914 void nfs_file_clear_open_context(struct file *filp)
916 struct nfs_open_context *ctx = nfs_file_open_context(filp);
919 struct inode *inode = d_inode(ctx->dentry);
922 * We fatal error on write before. Try to writeback
926 invalidate_inode_pages2(inode->i_mapping);
927 filp->private_data = NULL;
928 spin_lock(&inode->i_lock);
929 list_move_tail(&ctx->list, &NFS_I(inode)->open_files);
930 spin_unlock(&inode->i_lock);
931 put_nfs_open_context_sync(ctx);
936 * These allocate and release file read/write context information.
938 int nfs_open(struct inode *inode, struct file *filp)
940 struct nfs_open_context *ctx;
942 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode);
945 nfs_file_set_open_context(filp, ctx);
946 put_nfs_open_context(ctx);
947 nfs_fscache_open_file(inode, filp);
950 EXPORT_SYMBOL_GPL(nfs_open);
953 * This function is called whenever some part of NFS notices that
954 * the cached attributes have to be refreshed.
957 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
959 int status = -ESTALE;
960 struct nfs4_label *label = NULL;
961 struct nfs_fattr *fattr = NULL;
962 struct nfs_inode *nfsi = NFS_I(inode);
964 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
965 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
967 trace_nfs_revalidate_inode_enter(inode);
969 if (is_bad_inode(inode))
971 if (NFS_STALE(inode))
974 /* pNFS: Attributes aren't updated until we layoutcommit */
975 if (S_ISREG(inode->i_mode)) {
976 status = pnfs_sync_inode(inode, false);
982 fattr = nfs_alloc_fattr();
986 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
988 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
990 status = PTR_ERR(label);
994 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, label);
996 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
998 (unsigned long long)NFS_FILEID(inode), status);
999 if (status == -ESTALE) {
1000 nfs_zap_caches(inode);
1001 if (!S_ISDIR(inode->i_mode))
1002 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1007 status = nfs_refresh_inode(inode, fattr);
1009 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1011 (unsigned long long)NFS_FILEID(inode), status);
1015 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1016 nfs_zap_acl_cache(inode);
1018 nfs_setsecurity(inode, fattr, label);
1020 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1022 (unsigned long long)NFS_FILEID(inode));
1025 nfs4_label_free(label);
1027 nfs_free_fattr(fattr);
1028 trace_nfs_revalidate_inode_exit(inode, status);
1032 int nfs_attribute_timeout(struct inode *inode)
1034 struct nfs_inode *nfsi = NFS_I(inode);
1036 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
1039 int nfs_attribute_cache_expired(struct inode *inode)
1041 if (nfs_have_delegated_attributes(inode))
1043 return nfs_attribute_timeout(inode);
1047 * nfs_revalidate_inode - Revalidate the inode attributes
1048 * @server - pointer to nfs_server struct
1049 * @inode - pointer to inode struct
1051 * Updates inode attribute information by retrieving the data from the server.
1053 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1055 if (!nfs_need_revalidate_inode(inode))
1056 return NFS_STALE(inode) ? -ESTALE : 0;
1057 return __nfs_revalidate_inode(server, inode);
1059 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1061 int nfs_revalidate_inode_rcu(struct nfs_server *server, struct inode *inode)
1063 if (!(NFS_I(inode)->cache_validity &
1064 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
1065 && !nfs_attribute_cache_expired(inode))
1066 return NFS_STALE(inode) ? -ESTALE : 0;
1070 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1072 struct nfs_inode *nfsi = NFS_I(inode);
1075 if (mapping->nrpages != 0) {
1076 if (S_ISREG(inode->i_mode)) {
1077 unmap_mapping_range(mapping, 0, 0, 0);
1078 ret = nfs_sync_mapping(mapping);
1082 ret = invalidate_inode_pages2(mapping);
1086 if (S_ISDIR(inode->i_mode)) {
1087 spin_lock(&inode->i_lock);
1088 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1089 spin_unlock(&inode->i_lock);
1091 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1092 nfs_fscache_wait_on_invalidate(inode);
1094 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1096 (unsigned long long)NFS_FILEID(inode));
1100 static bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1102 if (nfs_have_delegated_attributes(inode))
1104 return (NFS_I(inode)->cache_validity & NFS_INO_REVAL_PAGECACHE)
1105 || nfs_attribute_timeout(inode)
1106 || NFS_STALE(inode);
1109 int nfs_revalidate_mapping_rcu(struct inode *inode)
1111 struct nfs_inode *nfsi = NFS_I(inode);
1112 unsigned long *bitlock = &nfsi->flags;
1115 if (IS_SWAPFILE(inode))
1117 if (nfs_mapping_need_revalidate_inode(inode)) {
1121 spin_lock(&inode->i_lock);
1122 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1123 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1125 spin_unlock(&inode->i_lock);
1131 * nfs_revalidate_mapping - Revalidate the pagecache
1132 * @inode - pointer to host inode
1133 * @mapping - pointer to mapping
1135 int nfs_revalidate_mapping(struct inode *inode,
1136 struct address_space *mapping)
1138 struct nfs_inode *nfsi = NFS_I(inode);
1139 unsigned long *bitlock = &nfsi->flags;
1142 /* swapfiles are not supposed to be shared. */
1143 if (IS_SWAPFILE(inode))
1146 if (nfs_mapping_need_revalidate_inode(inode)) {
1147 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1153 * We must clear NFS_INO_INVALID_DATA first to ensure that
1154 * invalidations that come in while we're shooting down the mappings
1155 * are respected. But, that leaves a race window where one revalidator
1156 * can clear the flag, and then another checks it before the mapping
1157 * gets invalidated. Fix that by serializing access to this part of
1160 * At the same time, we need to allow other tasks to see whether we
1161 * might be in the middle of invalidating the pages, so we only set
1162 * the bit lock here if it looks like we're going to be doing that.
1165 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1166 nfs_wait_bit_killable, TASK_KILLABLE);
1169 spin_lock(&inode->i_lock);
1170 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1171 spin_unlock(&inode->i_lock);
1174 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1176 spin_unlock(&inode->i_lock);
1180 set_bit(NFS_INO_INVALIDATING, bitlock);
1182 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1183 spin_unlock(&inode->i_lock);
1184 trace_nfs_invalidate_mapping_enter(inode);
1185 ret = nfs_invalidate_mapping(inode, mapping);
1186 trace_nfs_invalidate_mapping_exit(inode, ret);
1188 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1189 smp_mb__after_atomic();
1190 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1195 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1197 struct inode *inode = &nfsi->vfs_inode;
1199 assert_spin_locked(&inode->i_lock);
1201 if (!S_ISREG(inode->i_mode))
1203 if (list_empty(&nfsi->open_files))
1205 /* Note: This relies on nfsi->open_files being ordered with writers
1206 * being placed at the head of the list.
1207 * See nfs_inode_attach_open_context()
1209 return (list_first_entry(&nfsi->open_files,
1210 struct nfs_open_context,
1211 list)->mode & FMODE_WRITE) == FMODE_WRITE;
1214 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1216 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1219 static unsigned long nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1221 struct nfs_inode *nfsi = NFS_I(inode);
1222 unsigned long ret = 0;
1224 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1225 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1226 && inode->i_version == fattr->pre_change_attr) {
1227 inode->i_version = fattr->change_attr;
1228 if (S_ISDIR(inode->i_mode))
1229 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1230 ret |= NFS_INO_INVALID_ATTR;
1232 /* If we have atomic WCC data, we may update some attributes */
1233 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1234 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1235 && timespec_equal(&inode->i_ctime, &fattr->pre_ctime)) {
1236 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1237 ret |= NFS_INO_INVALID_ATTR;
1240 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1241 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1242 && timespec_equal(&inode->i_mtime, &fattr->pre_mtime)) {
1243 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1244 if (S_ISDIR(inode->i_mode))
1245 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1246 ret |= NFS_INO_INVALID_ATTR;
1248 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1249 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1250 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1251 && nfsi->nrequests == 0) {
1252 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1253 ret |= NFS_INO_INVALID_ATTR;
1260 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1261 * @inode - pointer to inode
1262 * @fattr - updated attributes
1264 * Verifies the attribute cache. If we have just changed the attributes,
1265 * so that fattr carries weak cache consistency data, then it may
1266 * also update the ctime/mtime/change_attribute.
1268 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1270 struct nfs_inode *nfsi = NFS_I(inode);
1271 loff_t cur_size, new_isize;
1272 unsigned long invalid = 0;
1275 if (nfs_have_delegated_attributes(inode))
1277 /* Has the inode gone and changed behind our back? */
1278 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
1280 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1283 if (!nfs_file_has_buffered_writers(nfsi)) {
1284 /* Verify a few of the more important attributes */
1285 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr)
1286 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_REVAL_PAGECACHE;
1288 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&inode->i_mtime, &fattr->mtime))
1289 invalid |= NFS_INO_INVALID_ATTR;
1291 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&inode->i_ctime, &fattr->ctime))
1292 invalid |= NFS_INO_INVALID_ATTR;
1294 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1295 cur_size = i_size_read(inode);
1296 new_isize = nfs_size_to_loff_t(fattr->size);
1297 if (cur_size != new_isize)
1298 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1302 /* Have any file permissions changed? */
1303 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1304 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1305 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1306 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1307 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1308 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1310 /* Has the link count changed? */
1311 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1312 invalid |= NFS_INO_INVALID_ATTR;
1314 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1315 invalid |= NFS_INO_INVALID_ATIME;
1318 nfs_set_cache_invalid(inode, invalid);
1320 nfsi->read_cache_jiffies = fattr->time_start;
1324 static atomic_long_t nfs_attr_generation_counter;
1326 static unsigned long nfs_read_attr_generation_counter(void)
1328 return atomic_long_read(&nfs_attr_generation_counter);
1331 unsigned long nfs_inc_attr_generation_counter(void)
1333 return atomic_long_inc_return(&nfs_attr_generation_counter);
1335 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1337 void nfs_fattr_init(struct nfs_fattr *fattr)
1340 fattr->time_start = jiffies;
1341 fattr->gencount = nfs_inc_attr_generation_counter();
1342 fattr->owner_name = NULL;
1343 fattr->group_name = NULL;
1345 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1348 * nfs_fattr_set_barrier
1349 * @fattr: attributes
1351 * Used to set a barrier after an attribute was updated. This
1352 * barrier ensures that older attributes from RPC calls that may
1353 * have raced with our update cannot clobber these new values.
1354 * Note that you are still responsible for ensuring that other
1355 * operations which change the attribute on the server do not
1358 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1360 fattr->gencount = nfs_inc_attr_generation_counter();
1363 struct nfs_fattr *nfs_alloc_fattr(void)
1365 struct nfs_fattr *fattr;
1367 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1369 nfs_fattr_init(fattr);
1372 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1374 struct nfs_fh *nfs_alloc_fhandle(void)
1378 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1383 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1387 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1388 * in the same way that wireshark does
1392 * For debugging only.
1394 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1396 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1397 * not on the result */
1398 return nfs_fhandle_hash(fh);
1400 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1403 * _nfs_display_fhandle - display an NFS file handle on the console
1405 * @fh: file handle to display
1406 * @caption: display caption
1408 * For debugging only.
1410 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1414 if (fh == NULL || fh->size == 0) {
1415 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1419 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1420 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1421 for (i = 0; i < fh->size; i += 16) {
1422 __be32 *pos = (__be32 *)&fh->data[i];
1424 switch ((fh->size - i - 1) >> 2) {
1426 printk(KERN_DEFAULT " %08x\n",
1430 printk(KERN_DEFAULT " %08x %08x\n",
1431 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1434 printk(KERN_DEFAULT " %08x %08x %08x\n",
1435 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1436 be32_to_cpup(pos + 2));
1439 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1440 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1441 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1445 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1449 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1450 * @inode - pointer to inode
1451 * @fattr - attributes
1453 * Attempt to divine whether or not an RPC call reply carrying stale
1454 * attributes got scheduled after another call carrying updated ones.
1456 * To do so, the function first assumes that a more recent ctime means
1457 * that the attributes in fattr are newer, however it also attempt to
1458 * catch the case where ctime either didn't change, or went backwards
1459 * (if someone reset the clock on the server) by looking at whether
1460 * or not this RPC call was started after the inode was last updated.
1461 * Note also the check for wraparound of 'attr_gencount'
1463 * The function returns 'true' if it thinks the attributes in 'fattr' are
1464 * more recent than the ones cached in the inode.
1467 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1469 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1471 return (long)(fattr->gencount - attr_gencount) > 0 ||
1472 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1475 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1479 trace_nfs_refresh_inode_enter(inode);
1481 if (nfs_inode_attrs_need_update(inode, fattr))
1482 ret = nfs_update_inode(inode, fattr);
1484 ret = nfs_check_inode_attributes(inode, fattr);
1486 trace_nfs_refresh_inode_exit(inode, ret);
1491 * nfs_refresh_inode - try to update the inode attribute cache
1492 * @inode - pointer to inode
1493 * @fattr - updated attributes
1495 * Check that an RPC call that returned attributes has not overlapped with
1496 * other recent updates of the inode metadata, then decide whether it is
1497 * safe to do a full update of the inode attributes, or whether just to
1498 * call nfs_check_inode_attributes.
1500 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1504 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1506 spin_lock(&inode->i_lock);
1507 status = nfs_refresh_inode_locked(inode, fattr);
1508 spin_unlock(&inode->i_lock);
1512 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1514 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1516 unsigned long invalid = NFS_INO_INVALID_ATTR;
1519 * Don't revalidate the pagecache if we hold a delegation, but do
1520 * force an attribute update
1522 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1523 invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_FORCED;
1525 if (S_ISDIR(inode->i_mode))
1526 invalid |= NFS_INO_INVALID_DATA;
1527 nfs_set_cache_invalid(inode, invalid);
1528 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1530 return nfs_refresh_inode_locked(inode, fattr);
1534 * nfs_post_op_update_inode - try to update the inode attribute cache
1535 * @inode - pointer to inode
1536 * @fattr - updated attributes
1538 * After an operation that has changed the inode metadata, mark the
1539 * attribute cache as being invalid, then try to update it.
1541 * NB: if the server didn't return any post op attributes, this
1542 * function will force the retrieval of attributes before the next
1543 * NFS request. Thus it should be used only for operations that
1544 * are expected to change one or more attributes, to avoid
1545 * unnecessary NFS requests and trips through nfs_update_inode().
1547 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1551 spin_lock(&inode->i_lock);
1552 nfs_fattr_set_barrier(fattr);
1553 status = nfs_post_op_update_inode_locked(inode, fattr);
1554 spin_unlock(&inode->i_lock);
1558 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1561 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1562 * @inode - pointer to inode
1563 * @fattr - updated attributes
1565 * After an operation that has changed the inode metadata, mark the
1566 * attribute cache as being invalid, then try to update it. Fake up
1567 * weak cache consistency data, if none exist.
1569 * This function is mainly designed to be used by the ->write_done() functions.
1571 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1575 /* Don't do a WCC update if these attributes are already stale */
1576 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1577 !nfs_inode_attrs_need_update(inode, fattr)) {
1578 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1579 | NFS_ATTR_FATTR_PRESIZE
1580 | NFS_ATTR_FATTR_PREMTIME
1581 | NFS_ATTR_FATTR_PRECTIME);
1584 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1585 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1586 fattr->pre_change_attr = inode->i_version;
1587 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1589 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1590 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1591 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1592 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1594 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1595 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1596 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1597 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1599 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1600 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1601 fattr->pre_size = i_size_read(inode);
1602 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1605 status = nfs_post_op_update_inode_locked(inode, fattr);
1610 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1611 * @inode - pointer to inode
1612 * @fattr - updated attributes
1614 * After an operation that has changed the inode metadata, mark the
1615 * attribute cache as being invalid, then try to update it. Fake up
1616 * weak cache consistency data, if none exist.
1618 * This function is mainly designed to be used by the ->write_done() functions.
1620 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1624 spin_lock(&inode->i_lock);
1625 nfs_fattr_set_barrier(fattr);
1626 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1627 spin_unlock(&inode->i_lock);
1630 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1633 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1634 struct nfs_fattr *fattr)
1636 bool ret1 = true, ret2 = true;
1638 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1639 ret1 = (nfsi->fileid == fattr->fileid);
1640 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1641 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1642 return ret1 || ret2;
1646 * Many nfs protocol calls return the new file attributes after
1647 * an operation. Here we update the inode to reflect the state
1648 * of the server's inode.
1650 * This is a bit tricky because we have to make sure all dirty pages
1651 * have been sent off to the server before calling invalidate_inode_pages.
1652 * To make sure no other process adds more write requests while we try
1653 * our best to flush them, we make them sleep during the attribute refresh.
1655 * A very similar scenario holds for the dir cache.
1657 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1659 struct nfs_server *server;
1660 struct nfs_inode *nfsi = NFS_I(inode);
1661 loff_t cur_isize, new_isize;
1662 unsigned long invalid = 0;
1663 unsigned long now = jiffies;
1664 unsigned long save_cache_validity;
1665 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1666 bool cache_revalidated = true;
1668 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1669 __func__, inode->i_sb->s_id, inode->i_ino,
1670 nfs_display_fhandle_hash(NFS_FH(inode)),
1671 atomic_read(&inode->i_count), fattr->valid);
1673 if (!nfs_fileid_valid(nfsi, fattr)) {
1674 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1675 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1676 NFS_SERVER(inode)->nfs_client->cl_hostname,
1677 inode->i_sb->s_id, (long long)nfsi->fileid,
1678 (long long)fattr->fileid);
1683 * Make sure the inode's type hasn't changed.
1685 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1687 * Big trouble! The inode has become a different object.
1689 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1690 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1694 server = NFS_SERVER(inode);
1695 /* Update the fsid? */
1696 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1697 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1698 !IS_AUTOMOUNT(inode))
1699 server->fsid = fattr->fsid;
1702 * Update the read time so we don't revalidate too often.
1704 nfsi->read_cache_jiffies = fattr->time_start;
1706 save_cache_validity = nfsi->cache_validity;
1707 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1708 | NFS_INO_INVALID_ATIME
1709 | NFS_INO_REVAL_FORCED
1710 | NFS_INO_REVAL_PAGECACHE);
1712 /* Do atomic weak cache consistency updates */
1713 invalid |= nfs_wcc_update_inode(inode, fattr);
1715 if (pnfs_layoutcommit_outstanding(inode)) {
1716 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1717 cache_revalidated = false;
1720 /* More cache consistency checks */
1721 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1722 if (inode->i_version != fattr->change_attr) {
1723 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1724 inode->i_sb->s_id, inode->i_ino);
1725 /* Could it be a race with writeback? */
1726 if (!have_writers) {
1727 invalid |= NFS_INO_INVALID_ATTR
1728 | NFS_INO_INVALID_DATA
1729 | NFS_INO_INVALID_ACCESS
1730 | NFS_INO_INVALID_ACL;
1731 if (S_ISDIR(inode->i_mode))
1732 nfs_force_lookup_revalidate(inode);
1734 inode->i_version = fattr->change_attr;
1737 nfsi->cache_validity |= save_cache_validity;
1738 cache_revalidated = false;
1741 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1742 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1743 } else if (server->caps & NFS_CAP_MTIME) {
1744 nfsi->cache_validity |= save_cache_validity &
1745 (NFS_INO_INVALID_ATTR
1746 | NFS_INO_REVAL_FORCED);
1747 cache_revalidated = false;
1750 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1751 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1752 } else if (server->caps & NFS_CAP_CTIME) {
1753 nfsi->cache_validity |= save_cache_validity &
1754 (NFS_INO_INVALID_ATTR
1755 | NFS_INO_REVAL_FORCED);
1756 cache_revalidated = false;
1759 /* Check if our cached file size is stale */
1760 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1761 new_isize = nfs_size_to_loff_t(fattr->size);
1762 cur_isize = i_size_read(inode);
1763 if (new_isize != cur_isize) {
1764 /* Do we perhaps have any outstanding writes, or has
1765 * the file grown beyond our last write? */
1766 if (nfsi->nrequests == 0 || new_isize > cur_isize) {
1767 i_size_write(inode, new_isize);
1769 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1771 dprintk("NFS: isize change on server for file %s/%ld "
1775 (long long)cur_isize,
1776 (long long)new_isize);
1779 nfsi->cache_validity |= save_cache_validity &
1780 (NFS_INO_INVALID_ATTR
1781 | NFS_INO_REVAL_PAGECACHE
1782 | NFS_INO_REVAL_FORCED);
1783 cache_revalidated = false;
1787 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1788 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1789 else if (server->caps & NFS_CAP_ATIME) {
1790 nfsi->cache_validity |= save_cache_validity &
1791 (NFS_INO_INVALID_ATIME
1792 | NFS_INO_REVAL_FORCED);
1793 cache_revalidated = false;
1796 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1797 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1798 umode_t newmode = inode->i_mode & S_IFMT;
1799 newmode |= fattr->mode & S_IALLUGO;
1800 inode->i_mode = newmode;
1801 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1803 } else if (server->caps & NFS_CAP_MODE) {
1804 nfsi->cache_validity |= save_cache_validity &
1805 (NFS_INO_INVALID_ATTR
1806 | NFS_INO_INVALID_ACCESS
1807 | NFS_INO_INVALID_ACL
1808 | NFS_INO_REVAL_FORCED);
1809 cache_revalidated = false;
1812 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1813 if (!uid_eq(inode->i_uid, fattr->uid)) {
1814 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1815 inode->i_uid = fattr->uid;
1817 } else if (server->caps & NFS_CAP_OWNER) {
1818 nfsi->cache_validity |= save_cache_validity &
1819 (NFS_INO_INVALID_ATTR
1820 | NFS_INO_INVALID_ACCESS
1821 | NFS_INO_INVALID_ACL
1822 | NFS_INO_REVAL_FORCED);
1823 cache_revalidated = false;
1826 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1827 if (!gid_eq(inode->i_gid, fattr->gid)) {
1828 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1829 inode->i_gid = fattr->gid;
1831 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1832 nfsi->cache_validity |= save_cache_validity &
1833 (NFS_INO_INVALID_ATTR
1834 | NFS_INO_INVALID_ACCESS
1835 | NFS_INO_INVALID_ACL
1836 | NFS_INO_REVAL_FORCED);
1837 cache_revalidated = false;
1840 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1841 if (inode->i_nlink != fattr->nlink) {
1842 invalid |= NFS_INO_INVALID_ATTR;
1843 if (S_ISDIR(inode->i_mode))
1844 invalid |= NFS_INO_INVALID_DATA;
1845 set_nlink(inode, fattr->nlink);
1847 } else if (server->caps & NFS_CAP_NLINK) {
1848 nfsi->cache_validity |= save_cache_validity &
1849 (NFS_INO_INVALID_ATTR
1850 | NFS_INO_REVAL_FORCED);
1851 cache_revalidated = false;
1854 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1856 * report the blocks in 512byte units
1858 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1859 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1860 inode->i_blocks = fattr->du.nfs2.blocks;
1862 cache_revalidated = false;
1864 /* Update attrtimeo value if we're out of the unstable period */
1865 if (invalid & NFS_INO_INVALID_ATTR) {
1866 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1867 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1868 nfsi->attrtimeo_timestamp = now;
1869 /* Set barrier to be more recent than all outstanding updates */
1870 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1872 if (cache_revalidated) {
1873 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1874 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1875 nfsi->attrtimeo <<= 1;
1876 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1877 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1879 nfsi->attrtimeo_timestamp = now;
1881 /* Set the barrier to be more recent than this fattr */
1882 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
1883 nfsi->attr_gencount = fattr->gencount;
1886 /* Don't declare attrcache up to date if there were no attrs! */
1887 if (cache_revalidated)
1888 invalid &= ~NFS_INO_INVALID_ATTR;
1890 /* Don't invalidate the data if we were to blame */
1891 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1892 || S_ISLNK(inode->i_mode)))
1893 invalid &= ~NFS_INO_INVALID_DATA;
1894 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1895 (save_cache_validity & NFS_INO_REVAL_FORCED))
1896 nfs_set_cache_invalid(inode, invalid);
1901 * No need to worry about unhashing the dentry, as the
1902 * lookup validation will know that the inode is bad.
1903 * (But we fall through to invalidate the caches.)
1905 nfs_invalidate_inode(inode);
1909 struct inode *nfs_alloc_inode(struct super_block *sb)
1911 struct nfs_inode *nfsi;
1912 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1916 nfsi->cache_validity = 0UL;
1917 #if IS_ENABLED(CONFIG_NFS_V4)
1918 nfsi->nfs4_acl = NULL;
1919 #endif /* CONFIG_NFS_V4 */
1920 return &nfsi->vfs_inode;
1922 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1924 static void nfs_i_callback(struct rcu_head *head)
1926 struct inode *inode = container_of(head, struct inode, i_rcu);
1927 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1930 void nfs_destroy_inode(struct inode *inode)
1932 call_rcu(&inode->i_rcu, nfs_i_callback);
1934 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1936 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1938 #if IS_ENABLED(CONFIG_NFS_V4)
1939 INIT_LIST_HEAD(&nfsi->open_states);
1940 nfsi->delegation = NULL;
1941 init_rwsem(&nfsi->rwsem);
1942 nfsi->layout = NULL;
1946 static void init_once(void *foo)
1948 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1950 inode_init_once(&nfsi->vfs_inode);
1951 INIT_LIST_HEAD(&nfsi->open_files);
1952 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1953 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1954 INIT_LIST_HEAD(&nfsi->commit_info.list);
1955 nfsi->nrequests = 0;
1956 nfsi->commit_info.ncommit = 0;
1957 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1958 init_rwsem(&nfsi->rmdir_sem);
1959 nfs4_init_once(nfsi);
1962 static int __init nfs_init_inodecache(void)
1964 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1965 sizeof(struct nfs_inode),
1966 0, (SLAB_RECLAIM_ACCOUNT|
1967 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
1969 if (nfs_inode_cachep == NULL)
1975 static void nfs_destroy_inodecache(void)
1978 * Make sure all delayed rcu free inodes are flushed before we
1982 kmem_cache_destroy(nfs_inode_cachep);
1985 struct workqueue_struct *nfsiod_workqueue;
1986 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1989 * start up the nfsiod workqueue
1991 static int nfsiod_start(void)
1993 struct workqueue_struct *wq;
1994 dprintk("RPC: creating workqueue nfsiod\n");
1995 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
1998 nfsiod_workqueue = wq;
2003 * Destroy the nfsiod workqueue
2005 static void nfsiod_stop(void)
2007 struct workqueue_struct *wq;
2009 wq = nfsiod_workqueue;
2012 nfsiod_workqueue = NULL;
2013 destroy_workqueue(wq);
2017 EXPORT_SYMBOL_GPL(nfs_net_id);
2019 static int nfs_net_init(struct net *net)
2021 nfs_clients_init(net);
2022 return nfs_fs_proc_net_init(net);
2025 static void nfs_net_exit(struct net *net)
2027 nfs_fs_proc_net_exit(net);
2028 nfs_cleanup_cb_ident_idr(net);
2031 static struct pernet_operations nfs_net_ops = {
2032 .init = nfs_net_init,
2033 .exit = nfs_net_exit,
2035 .size = sizeof(struct nfs_net),
2041 static int __init init_nfs_fs(void)
2045 err = register_pernet_subsys(&nfs_net_ops);
2049 err = nfs_fscache_register();
2053 err = nfsiod_start();
2057 err = nfs_fs_proc_init();
2061 err = nfs_init_nfspagecache();
2065 err = nfs_init_inodecache();
2069 err = nfs_init_readpagecache();
2073 err = nfs_init_writepagecache();
2077 err = nfs_init_directcache();
2081 rpc_proc_register(&init_net, &nfs_rpcstat);
2083 err = register_nfs_fs();
2089 rpc_proc_unregister(&init_net, "nfs");
2090 nfs_destroy_directcache();
2092 nfs_destroy_writepagecache();
2094 nfs_destroy_readpagecache();
2096 nfs_destroy_inodecache();
2098 nfs_destroy_nfspagecache();
2104 nfs_fscache_unregister();
2106 unregister_pernet_subsys(&nfs_net_ops);
2111 static void __exit exit_nfs_fs(void)
2113 nfs_destroy_directcache();
2114 nfs_destroy_writepagecache();
2115 nfs_destroy_readpagecache();
2116 nfs_destroy_inodecache();
2117 nfs_destroy_nfspagecache();
2118 nfs_fscache_unregister();
2119 unregister_pernet_subsys(&nfs_net_ops);
2120 rpc_proc_unregister(&init_net, "nfs");
2121 unregister_nfs_fs();
2126 /* Not quite true; I just maintain it */
2127 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2128 MODULE_LICENSE("GPL");
2129 module_param(enable_ino64, bool, 0644);
2131 module_init(init_nfs_fs)
2132 module_exit(exit_nfs_fs)