1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 1992 Rick Sladkey
7 * nfs inode and superblock handling functions
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
17 #include <linux/module.h>
18 #include <linux/init.h>
19 #include <linux/sched/signal.h>
20 #include <linux/time.h>
21 #include <linux/kernel.h>
23 #include <linux/string.h>
24 #include <linux/stat.h>
25 #include <linux/errno.h>
26 #include <linux/unistd.h>
27 #include <linux/sunrpc/clnt.h>
28 #include <linux/sunrpc/stats.h>
29 #include <linux/sunrpc/metrics.h>
30 #include <linux/nfs_fs.h>
31 #include <linux/nfs_mount.h>
32 #include <linux/nfs4_mount.h>
33 #include <linux/lockd/bind.h>
34 #include <linux/seq_file.h>
35 #include <linux/mount.h>
36 #include <linux/vfs.h>
37 #include <linux/inet.h>
38 #include <linux/nfs_xdr.h>
39 #include <linux/slab.h>
40 #include <linux/compat.h>
41 #include <linux/freezer.h>
42 #include <linux/uaccess.h>
43 #include <linux/iversion.h>
47 #include "delegation.h"
58 #define NFSDBG_FACILITY NFSDBG_VFS
60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
62 /* Default is to see 64-bit inode numbers */
63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
65 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
67 static struct kmem_cache * nfs_inode_cachep;
69 static inline unsigned long
70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
72 return nfs_fileid_to_ino_t(fattr->fileid);
75 static int nfs_wait_killable(int mode)
77 freezable_schedule_unsafe();
78 if (signal_pending_state(mode, current))
83 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
85 return nfs_wait_killable(mode);
87 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
90 * nfs_compat_user_ino64 - returns the user-visible inode number
91 * @fileid: 64-bit fileid
93 * This function returns a 32-bit inode number if the boot parameter
94 * nfs.enable_ino64 is zero.
96 u64 nfs_compat_user_ino64(u64 fileid)
107 if (sizeof(ino) < sizeof(fileid))
108 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
112 int nfs_drop_inode(struct inode *inode)
114 return NFS_STALE(inode) || generic_drop_inode(inode);
116 EXPORT_SYMBOL_GPL(nfs_drop_inode);
118 void nfs_clear_inode(struct inode *inode)
121 * The following should never happen...
123 WARN_ON_ONCE(nfs_have_writebacks(inode));
124 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
125 nfs_zap_acl_cache(inode);
126 nfs_access_zap_cache(inode);
127 nfs_fscache_clear_inode(inode);
129 EXPORT_SYMBOL_GPL(nfs_clear_inode);
131 void nfs_evict_inode(struct inode *inode)
133 truncate_inode_pages_final(&inode->i_data);
135 nfs_clear_inode(inode);
138 int nfs_sync_inode(struct inode *inode)
140 inode_dio_wait(inode);
141 return nfs_wb_all(inode);
143 EXPORT_SYMBOL_GPL(nfs_sync_inode);
146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
147 * @mapping: pointer to struct address_space
149 int nfs_sync_mapping(struct address_space *mapping)
153 if (mapping->nrpages != 0) {
154 unmap_mapping_range(mapping, 0, 0, 0);
155 ret = nfs_wb_all(mapping->host);
160 static int nfs_attribute_timeout(struct inode *inode)
162 struct nfs_inode *nfsi = NFS_I(inode);
164 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
167 static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
169 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
171 /* Special case for the pagecache or access cache */
172 if (flags == NFS_INO_REVAL_PAGECACHE &&
173 !(cache_validity & NFS_INO_REVAL_FORCED))
175 return (cache_validity & flags) != 0;
178 static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
180 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
182 if ((cache_validity & flags) != 0)
184 if (nfs_attribute_timeout(inode))
189 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
191 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
192 return nfs_check_cache_invalid_delegated(inode, flags);
194 return nfs_check_cache_invalid_not_delegated(inode, flags);
196 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
198 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
200 struct nfs_inode *nfsi = NFS_I(inode);
201 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
203 if (have_delegation) {
204 if (!(flags & NFS_INO_REVAL_FORCED))
205 flags &= ~NFS_INO_INVALID_OTHER;
206 flags &= ~(NFS_INO_INVALID_CHANGE
207 | NFS_INO_INVALID_SIZE
208 | NFS_INO_REVAL_PAGECACHE
209 | NFS_INO_INVALID_XATTR);
212 if (inode->i_mapping->nrpages == 0)
213 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
214 nfsi->cache_validity |= flags;
215 if (flags & NFS_INO_INVALID_DATA)
216 nfs_fscache_invalidate(inode);
220 * Invalidate the local caches
222 static void nfs_zap_caches_locked(struct inode *inode)
224 struct nfs_inode *nfsi = NFS_I(inode);
225 int mode = inode->i_mode;
227 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
229 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
230 nfsi->attrtimeo_timestamp = jiffies;
232 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
233 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
234 | NFS_INO_INVALID_DATA
235 | NFS_INO_INVALID_ACCESS
236 | NFS_INO_INVALID_ACL
237 | NFS_INO_INVALID_XATTR
238 | NFS_INO_REVAL_PAGECACHE);
240 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
241 | NFS_INO_INVALID_ACCESS
242 | NFS_INO_INVALID_ACL
243 | NFS_INO_INVALID_XATTR
244 | NFS_INO_REVAL_PAGECACHE);
245 nfs_zap_label_cache_locked(nfsi);
248 void nfs_zap_caches(struct inode *inode)
250 spin_lock(&inode->i_lock);
251 nfs_zap_caches_locked(inode);
252 spin_unlock(&inode->i_lock);
255 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
257 if (mapping->nrpages != 0) {
258 spin_lock(&inode->i_lock);
259 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
260 spin_unlock(&inode->i_lock);
264 void nfs_zap_acl_cache(struct inode *inode)
266 void (*clear_acl_cache)(struct inode *);
268 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
269 if (clear_acl_cache != NULL)
270 clear_acl_cache(inode);
271 spin_lock(&inode->i_lock);
272 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
273 spin_unlock(&inode->i_lock);
275 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
277 void nfs_invalidate_atime(struct inode *inode)
279 spin_lock(&inode->i_lock);
280 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
281 spin_unlock(&inode->i_lock);
283 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
286 * Invalidate, but do not unhash, the inode.
287 * NB: must be called with inode->i_lock held!
289 static void nfs_set_inode_stale_locked(struct inode *inode)
291 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
292 nfs_zap_caches_locked(inode);
293 trace_nfs_set_inode_stale(inode);
296 void nfs_set_inode_stale(struct inode *inode)
298 spin_lock(&inode->i_lock);
299 nfs_set_inode_stale_locked(inode);
300 spin_unlock(&inode->i_lock);
303 struct nfs_find_desc {
305 struct nfs_fattr *fattr;
309 * In NFSv3 we can have 64bit inode numbers. In order to support
310 * this, and re-exported directories (also seen in NFSv2)
311 * we are forced to allow 2 different inodes to have the same
315 nfs_find_actor(struct inode *inode, void *opaque)
317 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
318 struct nfs_fh *fh = desc->fh;
319 struct nfs_fattr *fattr = desc->fattr;
321 if (NFS_FILEID(inode) != fattr->fileid)
323 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
325 if (nfs_compare_fh(NFS_FH(inode), fh))
327 if (is_bad_inode(inode) || NFS_STALE(inode))
333 nfs_init_locked(struct inode *inode, void *opaque)
335 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
336 struct nfs_fattr *fattr = desc->fattr;
338 set_nfs_fileid(inode, fattr->fileid);
339 inode->i_mode = fattr->mode;
340 nfs_copy_fh(NFS_FH(inode), desc->fh);
344 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
345 static void nfs_clear_label_invalid(struct inode *inode)
347 spin_lock(&inode->i_lock);
348 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
349 spin_unlock(&inode->i_lock);
352 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
353 struct nfs4_label *label)
360 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
361 error = security_inode_notifysecctx(inode, label->label,
364 printk(KERN_ERR "%s() %s %d "
365 "security_inode_notifysecctx() %d\n",
367 (char *)label->label,
369 nfs_clear_label_invalid(inode);
373 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
375 struct nfs4_label *label = NULL;
376 int minor_version = server->nfs_client->cl_minorversion;
378 if (minor_version < 2)
381 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
384 label = kzalloc(sizeof(struct nfs4_label), flags);
386 return ERR_PTR(-ENOMEM);
388 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
389 if (label->label == NULL) {
391 return ERR_PTR(-ENOMEM);
393 label->len = NFS4_MAXLABELLEN;
397 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
399 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
400 struct nfs4_label *label)
404 EXPORT_SYMBOL_GPL(nfs_setsecurity);
406 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
408 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
410 struct nfs_find_desc desc = {
417 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
418 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
421 hash = nfs_fattr_to_ino_t(fattr);
422 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
424 dprintk("%s: returning %p\n", __func__, inode);
429 * This is our front-end to iget that looks up inodes by file handle
430 * instead of inode number.
433 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
435 struct nfs_find_desc desc = {
439 struct inode *inode = ERR_PTR(-ENOENT);
442 nfs_attr_check_mountpoint(sb, fattr);
444 if (nfs_attr_use_mounted_on_fileid(fattr))
445 fattr->fileid = fattr->mounted_on_fileid;
446 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
448 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
451 hash = nfs_fattr_to_ino_t(fattr);
453 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
455 inode = ERR_PTR(-ENOMEM);
459 if (inode->i_state & I_NEW) {
460 struct nfs_inode *nfsi = NFS_I(inode);
461 unsigned long now = jiffies;
463 /* We set i_ino for the few things that still rely on it,
467 /* We can't support update_atime(), since the server will reset it */
468 inode->i_flags |= S_NOATIME|S_NOCMTIME;
469 inode->i_mode = fattr->mode;
470 nfsi->cache_validity = 0;
471 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
472 && nfs_server_capable(inode, NFS_CAP_MODE))
473 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
474 /* Why so? Because we want revalidate for devices/FIFOs, and
475 * that's precisely what we have in nfs_file_inode_operations.
477 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
478 if (S_ISREG(inode->i_mode)) {
479 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
480 inode->i_data.a_ops = &nfs_file_aops;
481 } else if (S_ISDIR(inode->i_mode)) {
482 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
483 inode->i_fop = &nfs_dir_operations;
484 inode->i_data.a_ops = &nfs_dir_aops;
485 /* Deal with crossing mountpoints */
486 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
487 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
488 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
489 inode->i_op = &nfs_referral_inode_operations;
491 inode->i_op = &nfs_mountpoint_inode_operations;
493 inode->i_flags |= S_AUTOMOUNT;
495 } else if (S_ISLNK(inode->i_mode)) {
496 inode->i_op = &nfs_symlink_inode_operations;
497 inode_nohighmem(inode);
499 init_special_inode(inode, inode->i_mode, fattr->rdev);
501 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
502 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
503 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
504 inode_set_iversion_raw(inode, 0);
507 inode->i_uid = make_kuid(&init_user_ns, -2);
508 inode->i_gid = make_kgid(&init_user_ns, -2);
510 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
514 nfsi->read_cache_jiffies = fattr->time_start;
515 nfsi->attr_gencount = fattr->gencount;
516 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
517 inode->i_atime = fattr->atime;
518 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
519 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
520 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
521 inode->i_mtime = fattr->mtime;
522 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
523 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
524 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
525 inode->i_ctime = fattr->ctime;
526 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
527 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
528 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
529 inode_set_iversion_raw(inode, fattr->change_attr);
531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
532 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
533 inode->i_size = nfs_size_to_loff_t(fattr->size);
535 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
536 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
537 set_nlink(inode, fattr->nlink);
538 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
539 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
540 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
541 inode->i_uid = fattr->uid;
542 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
543 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
544 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
545 inode->i_gid = fattr->gid;
546 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
547 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
548 if (nfs_server_capable(inode, NFS_CAP_XATTR))
549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
550 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
551 inode->i_blocks = fattr->du.nfs2.blocks;
552 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
554 * report the blocks in 512byte units
556 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
559 if (nfsi->cache_validity != 0)
560 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
562 nfs_setsecurity(inode, fattr, label);
564 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
565 nfsi->attrtimeo_timestamp = now;
566 nfsi->access_cache = RB_ROOT;
568 nfs_fscache_init_inode(inode);
570 unlock_new_inode(inode);
572 int err = nfs_refresh_inode(inode, fattr);
575 inode = ERR_PTR(err);
579 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
581 (unsigned long long)NFS_FILEID(inode),
582 nfs_display_fhandle_hash(fh),
583 atomic_read(&inode->i_count));
589 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
592 EXPORT_SYMBOL_GPL(nfs_fhget);
594 #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)
597 nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
600 struct inode *inode = d_inode(dentry);
601 struct nfs_fattr *fattr;
604 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
606 /* skip mode change if it's just for clearing setuid/setgid */
607 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
608 attr->ia_valid &= ~ATTR_MODE;
610 if (attr->ia_valid & ATTR_SIZE) {
611 BUG_ON(!S_ISREG(inode->i_mode));
613 error = inode_newsize_ok(inode, attr->ia_size);
617 if (attr->ia_size == i_size_read(inode))
618 attr->ia_valid &= ~ATTR_SIZE;
621 /* Optimization: if the end result is no change, don't RPC */
622 attr->ia_valid &= NFS_VALID_ATTRS;
623 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
626 trace_nfs_setattr_enter(inode);
628 /* Write all dirty data */
629 if (S_ISREG(inode->i_mode))
630 nfs_sync_inode(inode);
632 fattr = nfs_alloc_fattr();
638 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
640 error = nfs_refresh_inode(inode, fattr);
641 nfs_free_fattr(fattr);
643 trace_nfs_setattr_exit(inode, error);
646 EXPORT_SYMBOL_GPL(nfs_setattr);
649 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
650 * @inode: inode of the file used
651 * @offset: file offset to start truncating
653 * This is a copy of the common vmtruncate, but with the locking
654 * corrected to take into account the fact that NFS requires
655 * inode->i_size to be updated under the inode->i_lock.
656 * Note: must be called with inode->i_lock held!
658 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
662 err = inode_newsize_ok(inode, offset);
666 i_size_write(inode, offset);
669 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
670 NFS_INO_DATA_INVAL_DEFER);
671 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
673 spin_unlock(&inode->i_lock);
674 truncate_pagecache(inode, offset);
675 spin_lock(&inode->i_lock);
681 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
682 * @inode: pointer to struct inode
683 * @attr: pointer to struct iattr
684 * @fattr: pointer to struct nfs_fattr
686 * Note: we do this in the *proc.c in order to ensure that
687 * it works for things like exclusive creates too.
689 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
690 struct nfs_fattr *fattr)
692 /* Barrier: bump the attribute generation count. */
693 nfs_fattr_set_barrier(fattr);
695 spin_lock(&inode->i_lock);
696 NFS_I(inode)->attr_gencount = fattr->gencount;
697 if ((attr->ia_valid & ATTR_SIZE) != 0) {
698 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
699 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
700 nfs_vmtruncate(inode, attr->ia_size);
702 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
703 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
704 if ((attr->ia_valid & ATTR_MODE) != 0) {
705 int mode = attr->ia_mode & S_IALLUGO;
706 mode |= inode->i_mode & ~S_IALLUGO;
707 inode->i_mode = mode;
709 if ((attr->ia_valid & ATTR_UID) != 0)
710 inode->i_uid = attr->ia_uid;
711 if ((attr->ia_valid & ATTR_GID) != 0)
712 inode->i_gid = attr->ia_gid;
713 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
714 inode->i_ctime = fattr->ctime;
716 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
717 | NFS_INO_INVALID_CTIME);
718 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
719 | NFS_INO_INVALID_ACL);
721 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
722 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
723 | NFS_INO_INVALID_CTIME);
724 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
725 inode->i_atime = fattr->atime;
726 else if (attr->ia_valid & ATTR_ATIME_SET)
727 inode->i_atime = attr->ia_atime;
729 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
731 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
732 inode->i_ctime = fattr->ctime;
734 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
735 | NFS_INO_INVALID_CTIME);
737 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
738 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
739 | NFS_INO_INVALID_CTIME);
740 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
741 inode->i_mtime = fattr->mtime;
742 else if (attr->ia_valid & ATTR_MTIME_SET)
743 inode->i_mtime = attr->ia_mtime;
745 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
747 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
748 inode->i_ctime = fattr->ctime;
750 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
751 | NFS_INO_INVALID_CTIME);
754 nfs_update_inode(inode, fattr);
755 spin_unlock(&inode->i_lock);
757 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
759 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
761 struct dentry *parent;
763 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
765 parent = dget_parent(dentry);
766 nfs_force_use_readdirplus(d_inode(parent));
770 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
772 struct dentry *parent;
774 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
776 parent = dget_parent(dentry);
777 nfs_advise_use_readdirplus(d_inode(parent));
781 static bool nfs_need_revalidate_inode(struct inode *inode)
783 if (NFS_I(inode)->cache_validity &
784 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
786 if (nfs_attribute_cache_expired(inode))
791 int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
792 struct kstat *stat, u32 request_mask, unsigned int query_flags)
794 struct inode *inode = d_inode(path->dentry);
795 struct nfs_server *server = NFS_SERVER(inode);
796 unsigned long cache_validity;
798 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
799 bool do_update = false;
801 trace_nfs_getattr_enter(inode);
803 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
804 nfs_readdirplus_parent_cache_hit(path->dentry);
808 /* Flush out writes to the server in order to update c/mtime. */
809 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
810 S_ISREG(inode->i_mode)) {
811 err = filemap_write_and_wait(inode->i_mapping);
817 * We may force a getattr if the user cares about atime.
819 * Note that we only have to check the vfsmount flags here:
820 * - NFS always sets S_NOATIME by so checking it would give a
822 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
823 * no point in checking those.
825 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
826 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
827 request_mask &= ~STATX_ATIME;
829 /* Is the user requesting attributes that might need revalidation? */
830 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
831 STATX_MTIME|STATX_UID|STATX_GID|
832 STATX_SIZE|STATX_BLOCKS)))
833 goto out_no_revalidate;
835 /* Check whether the cached attributes are stale */
836 do_update |= force_sync || nfs_attribute_cache_expired(inode);
837 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
838 do_update |= cache_validity &
839 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
840 if (request_mask & STATX_ATIME)
841 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
842 if (request_mask & (STATX_CTIME|STATX_MTIME))
843 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
844 if (request_mask & STATX_BLOCKS)
845 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
847 /* Update the attribute cache */
848 if (!(server->flags & NFS_MOUNT_NOAC))
849 nfs_readdirplus_parent_cache_miss(path->dentry);
851 nfs_readdirplus_parent_cache_hit(path->dentry);
852 err = __nfs_revalidate_inode(server, inode);
856 nfs_readdirplus_parent_cache_hit(path->dentry);
858 /* Only return attributes that were revalidated. */
859 stat->result_mask &= request_mask;
861 generic_fillattr(&init_user_ns, inode, stat);
862 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
863 if (S_ISDIR(inode->i_mode))
864 stat->blksize = NFS_SERVER(inode)->dtsize;
866 trace_nfs_getattr_exit(inode, err);
869 EXPORT_SYMBOL_GPL(nfs_getattr);
871 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
873 refcount_set(&l_ctx->count, 1);
874 l_ctx->lockowner = current->files;
875 INIT_LIST_HEAD(&l_ctx->list);
876 atomic_set(&l_ctx->io_count, 0);
879 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
881 struct nfs_lock_context *pos;
883 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
884 if (pos->lockowner != current->files)
886 if (refcount_inc_not_zero(&pos->count))
892 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
894 struct nfs_lock_context *res, *new = NULL;
895 struct inode *inode = d_inode(ctx->dentry);
898 res = __nfs_find_lock_context(ctx);
901 new = kmalloc(sizeof(*new), GFP_KERNEL);
903 return ERR_PTR(-ENOMEM);
904 nfs_init_lock_context(new);
905 spin_lock(&inode->i_lock);
906 res = __nfs_find_lock_context(ctx);
908 new->open_context = get_nfs_open_context(ctx);
909 if (new->open_context) {
910 list_add_tail_rcu(&new->list,
911 &ctx->lock_context.list);
915 res = ERR_PTR(-EBADF);
917 spin_unlock(&inode->i_lock);
922 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
924 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
926 struct nfs_open_context *ctx = l_ctx->open_context;
927 struct inode *inode = d_inode(ctx->dentry);
929 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
931 list_del_rcu(&l_ctx->list);
932 spin_unlock(&inode->i_lock);
933 put_nfs_open_context(ctx);
934 kfree_rcu(l_ctx, rcu_head);
936 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
939 * nfs_close_context - Common close_context() routine NFSv2/v3
940 * @ctx: pointer to context
941 * @is_sync: is this a synchronous close
943 * Ensure that the attributes are up to date if we're mounted
944 * with close-to-open semantics and we have cached data that will
945 * need to be revalidated on open.
947 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
949 struct nfs_inode *nfsi;
951 struct nfs_server *server;
953 if (!(ctx->mode & FMODE_WRITE))
957 inode = d_inode(ctx->dentry);
958 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
961 if (inode->i_mapping->nrpages == 0)
963 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
965 if (!list_empty(&nfsi->open_files))
967 server = NFS_SERVER(inode);
968 if (server->flags & NFS_MOUNT_NOCTO)
970 nfs_revalidate_inode(server, inode);
972 EXPORT_SYMBOL_GPL(nfs_close_context);
974 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
978 struct nfs_open_context *ctx;
980 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
982 return ERR_PTR(-ENOMEM);
983 nfs_sb_active(dentry->d_sb);
984 ctx->dentry = dget(dentry);
986 ctx->cred = get_cred(filp->f_cred);
988 ctx->cred = get_current_cred();
994 ctx->flock_owner = (fl_owner_t)filp;
995 nfs_init_lock_context(&ctx->lock_context);
996 ctx->lock_context.open_context = ctx;
997 INIT_LIST_HEAD(&ctx->list);
998 ctx->mdsthreshold = NULL;
1001 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1003 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1005 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1009 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1011 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1013 struct inode *inode = d_inode(ctx->dentry);
1014 struct super_block *sb = ctx->dentry->d_sb;
1016 if (!refcount_dec_and_test(&ctx->lock_context.count))
1018 if (!list_empty(&ctx->list)) {
1019 spin_lock(&inode->i_lock);
1020 list_del_rcu(&ctx->list);
1021 spin_unlock(&inode->i_lock);
1024 NFS_PROTO(inode)->close_context(ctx, is_sync);
1025 put_cred(ctx->cred);
1027 nfs_sb_deactive(sb);
1028 put_rpccred(ctx->ll_cred);
1029 kfree(ctx->mdsthreshold);
1030 kfree_rcu(ctx, rcu_head);
1033 void put_nfs_open_context(struct nfs_open_context *ctx)
1035 __put_nfs_open_context(ctx, 0);
1037 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1039 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1041 __put_nfs_open_context(ctx, 1);
1045 * Ensure that mmap has a recent RPC credential for use when writing out
1048 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1050 struct inode *inode = d_inode(ctx->dentry);
1051 struct nfs_inode *nfsi = NFS_I(inode);
1053 spin_lock(&inode->i_lock);
1054 if (list_empty(&nfsi->open_files) &&
1055 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1056 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1057 NFS_INO_REVAL_FORCED;
1058 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1059 spin_unlock(&inode->i_lock);
1061 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1063 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1065 filp->private_data = get_nfs_open_context(ctx);
1066 if (list_empty(&ctx->list))
1067 nfs_inode_attach_open_context(ctx);
1069 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1072 * Given an inode, search for an open context with the desired characteristics
1074 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1076 struct nfs_inode *nfsi = NFS_I(inode);
1077 struct nfs_open_context *pos, *ctx = NULL;
1080 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1081 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1083 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1085 ctx = get_nfs_open_context(pos);
1093 void nfs_file_clear_open_context(struct file *filp)
1095 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1098 struct inode *inode = d_inode(ctx->dentry);
1101 * We fatal error on write before. Try to writeback
1105 invalidate_inode_pages2(inode->i_mapping);
1106 filp->private_data = NULL;
1107 put_nfs_open_context_sync(ctx);
1112 * These allocate and release file read/write context information.
1114 int nfs_open(struct inode *inode, struct file *filp)
1116 struct nfs_open_context *ctx;
1118 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1120 return PTR_ERR(ctx);
1121 nfs_file_set_open_context(filp, ctx);
1122 put_nfs_open_context(ctx);
1123 nfs_fscache_open_file(inode, filp);
1126 EXPORT_SYMBOL_GPL(nfs_open);
1129 * This function is called whenever some part of NFS notices that
1130 * the cached attributes have to be refreshed.
1133 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1135 int status = -ESTALE;
1136 struct nfs4_label *label = NULL;
1137 struct nfs_fattr *fattr = NULL;
1138 struct nfs_inode *nfsi = NFS_I(inode);
1140 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1141 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1143 trace_nfs_revalidate_inode_enter(inode);
1145 if (is_bad_inode(inode))
1147 if (NFS_STALE(inode))
1150 /* pNFS: Attributes aren't updated until we layoutcommit */
1151 if (S_ISREG(inode->i_mode)) {
1152 status = pnfs_sync_inode(inode, false);
1158 fattr = nfs_alloc_fattr();
1162 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1164 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1165 if (IS_ERR(label)) {
1166 status = PTR_ERR(label);
1170 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1173 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1175 (unsigned long long)NFS_FILEID(inode), status);
1178 /* A soft timeout occurred. Use cached information? */
1179 if (server->flags & NFS_MOUNT_SOFTREVAL)
1183 if (!S_ISDIR(inode->i_mode))
1184 nfs_set_inode_stale(inode);
1186 nfs_zap_caches(inode);
1191 status = nfs_refresh_inode(inode, fattr);
1193 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1195 (unsigned long long)NFS_FILEID(inode), status);
1199 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1200 nfs_zap_acl_cache(inode);
1202 nfs_setsecurity(inode, fattr, label);
1204 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1206 (unsigned long long)NFS_FILEID(inode));
1209 nfs4_label_free(label);
1211 nfs_free_fattr(fattr);
1212 trace_nfs_revalidate_inode_exit(inode, status);
1216 int nfs_attribute_cache_expired(struct inode *inode)
1218 if (nfs_have_delegated_attributes(inode))
1220 return nfs_attribute_timeout(inode);
1224 * nfs_revalidate_inode - Revalidate the inode attributes
1225 * @server: pointer to nfs_server struct
1226 * @inode: pointer to inode struct
1228 * Updates inode attribute information by retrieving the data from the server.
1230 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1232 if (!nfs_need_revalidate_inode(inode))
1233 return NFS_STALE(inode) ? -ESTALE : 0;
1234 return __nfs_revalidate_inode(server, inode);
1236 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1238 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1242 if (mapping->nrpages != 0) {
1243 if (S_ISREG(inode->i_mode)) {
1244 ret = nfs_sync_mapping(mapping);
1248 ret = invalidate_inode_pages2(mapping);
1252 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1253 nfs_fscache_wait_on_invalidate(inode);
1255 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1257 (unsigned long long)NFS_FILEID(inode));
1261 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1263 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1267 int nfs_revalidate_mapping_rcu(struct inode *inode)
1269 struct nfs_inode *nfsi = NFS_I(inode);
1270 unsigned long *bitlock = &nfsi->flags;
1273 if (IS_SWAPFILE(inode))
1275 if (nfs_mapping_need_revalidate_inode(inode)) {
1279 spin_lock(&inode->i_lock);
1280 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1281 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1283 spin_unlock(&inode->i_lock);
1289 * nfs_revalidate_mapping - Revalidate the pagecache
1290 * @inode: pointer to host inode
1291 * @mapping: pointer to mapping
1293 int nfs_revalidate_mapping(struct inode *inode,
1294 struct address_space *mapping)
1296 struct nfs_inode *nfsi = NFS_I(inode);
1297 unsigned long *bitlock = &nfsi->flags;
1300 /* swapfiles are not supposed to be shared. */
1301 if (IS_SWAPFILE(inode))
1304 if (nfs_mapping_need_revalidate_inode(inode)) {
1305 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1311 * We must clear NFS_INO_INVALID_DATA first to ensure that
1312 * invalidations that come in while we're shooting down the mappings
1313 * are respected. But, that leaves a race window where one revalidator
1314 * can clear the flag, and then another checks it before the mapping
1315 * gets invalidated. Fix that by serializing access to this part of
1318 * At the same time, we need to allow other tasks to see whether we
1319 * might be in the middle of invalidating the pages, so we only set
1320 * the bit lock here if it looks like we're going to be doing that.
1323 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1324 nfs_wait_bit_killable, TASK_KILLABLE);
1327 spin_lock(&inode->i_lock);
1328 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1329 spin_unlock(&inode->i_lock);
1332 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1334 spin_unlock(&inode->i_lock);
1338 set_bit(NFS_INO_INVALIDATING, bitlock);
1340 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1341 NFS_INO_DATA_INVAL_DEFER);
1342 spin_unlock(&inode->i_lock);
1343 trace_nfs_invalidate_mapping_enter(inode);
1344 ret = nfs_invalidate_mapping(inode, mapping);
1345 trace_nfs_invalidate_mapping_exit(inode, ret);
1347 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1348 smp_mb__after_atomic();
1349 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1354 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1356 struct inode *inode = &nfsi->vfs_inode;
1358 if (!S_ISREG(inode->i_mode))
1360 if (list_empty(&nfsi->open_files))
1362 return inode_is_open_for_write(inode);
1365 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1367 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1370 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1372 struct timespec64 ts;
1374 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1375 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1376 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1377 inode_set_iversion_raw(inode, fattr->change_attr);
1378 if (S_ISDIR(inode->i_mode))
1379 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1380 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1381 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1383 /* If we have atomic WCC data, we may update some attributes */
1384 ts = inode->i_ctime;
1385 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1386 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1387 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1388 inode->i_ctime = fattr->ctime;
1391 ts = inode->i_mtime;
1392 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1393 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1394 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1395 inode->i_mtime = fattr->mtime;
1396 if (S_ISDIR(inode->i_mode))
1397 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1399 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1400 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1401 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1402 && !nfs_have_writebacks(inode)) {
1403 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1408 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1409 * @inode: pointer to inode
1410 * @fattr: updated attributes
1412 * Verifies the attribute cache. If we have just changed the attributes,
1413 * so that fattr carries weak cache consistency data, then it may
1414 * also update the ctime/mtime/change_attribute.
1416 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1418 struct nfs_inode *nfsi = NFS_I(inode);
1419 loff_t cur_size, new_isize;
1420 unsigned long invalid = 0;
1421 struct timespec64 ts;
1423 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1426 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1427 /* Only a mounted-on-fileid? Just exit */
1428 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1430 /* Has the inode gone and changed behind our back? */
1431 } else if (nfsi->fileid != fattr->fileid) {
1432 /* Is this perhaps the mounted-on fileid? */
1433 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1434 nfsi->fileid == fattr->mounted_on_fileid)
1438 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
1442 if (!nfs_file_has_buffered_writers(nfsi)) {
1443 /* Verify a few of the more important attributes */
1444 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1445 invalid |= NFS_INO_INVALID_CHANGE
1446 | NFS_INO_REVAL_PAGECACHE;
1448 ts = inode->i_mtime;
1449 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1450 invalid |= NFS_INO_INVALID_MTIME;
1452 ts = inode->i_ctime;
1453 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1454 invalid |= NFS_INO_INVALID_CTIME;
1456 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1457 cur_size = i_size_read(inode);
1458 new_isize = nfs_size_to_loff_t(fattr->size);
1459 if (cur_size != new_isize)
1460 invalid |= NFS_INO_INVALID_SIZE
1461 | NFS_INO_REVAL_PAGECACHE;
1465 /* Have any file permissions changed? */
1466 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1467 invalid |= NFS_INO_INVALID_ACCESS
1468 | NFS_INO_INVALID_ACL
1469 | NFS_INO_INVALID_OTHER;
1470 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1471 invalid |= NFS_INO_INVALID_ACCESS
1472 | NFS_INO_INVALID_ACL
1473 | NFS_INO_INVALID_OTHER;
1474 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1475 invalid |= NFS_INO_INVALID_ACCESS
1476 | NFS_INO_INVALID_ACL
1477 | NFS_INO_INVALID_OTHER;
1479 /* Has the link count changed? */
1480 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1481 invalid |= NFS_INO_INVALID_OTHER;
1483 ts = inode->i_atime;
1484 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1485 invalid |= NFS_INO_INVALID_ATIME;
1488 nfs_set_cache_invalid(inode, invalid);
1490 nfsi->read_cache_jiffies = fattr->time_start;
1494 static atomic_long_t nfs_attr_generation_counter;
1496 static unsigned long nfs_read_attr_generation_counter(void)
1498 return atomic_long_read(&nfs_attr_generation_counter);
1501 unsigned long nfs_inc_attr_generation_counter(void)
1503 return atomic_long_inc_return(&nfs_attr_generation_counter);
1505 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1507 void nfs_fattr_init(struct nfs_fattr *fattr)
1510 fattr->time_start = jiffies;
1511 fattr->gencount = nfs_inc_attr_generation_counter();
1512 fattr->owner_name = NULL;
1513 fattr->group_name = NULL;
1515 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1518 * nfs_fattr_set_barrier
1519 * @fattr: attributes
1521 * Used to set a barrier after an attribute was updated. This
1522 * barrier ensures that older attributes from RPC calls that may
1523 * have raced with our update cannot clobber these new values.
1524 * Note that you are still responsible for ensuring that other
1525 * operations which change the attribute on the server do not
1528 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1530 fattr->gencount = nfs_inc_attr_generation_counter();
1533 struct nfs_fattr *nfs_alloc_fattr(void)
1535 struct nfs_fattr *fattr;
1537 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1539 nfs_fattr_init(fattr);
1542 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1544 struct nfs_fh *nfs_alloc_fhandle(void)
1548 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1553 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1557 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1558 * in the same way that wireshark does
1562 * For debugging only.
1564 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1566 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1567 * not on the result */
1568 return nfs_fhandle_hash(fh);
1570 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1573 * _nfs_display_fhandle - display an NFS file handle on the console
1575 * @fh: file handle to display
1576 * @caption: display caption
1578 * For debugging only.
1580 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1584 if (fh == NULL || fh->size == 0) {
1585 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1589 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1590 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1591 for (i = 0; i < fh->size; i += 16) {
1592 __be32 *pos = (__be32 *)&fh->data[i];
1594 switch ((fh->size - i - 1) >> 2) {
1596 printk(KERN_DEFAULT " %08x\n",
1600 printk(KERN_DEFAULT " %08x %08x\n",
1601 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1604 printk(KERN_DEFAULT " %08x %08x %08x\n",
1605 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1606 be32_to_cpup(pos + 2));
1609 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1610 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1611 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1615 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1619 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1620 * @inode: pointer to inode
1621 * @fattr: attributes
1623 * Attempt to divine whether or not an RPC call reply carrying stale
1624 * attributes got scheduled after another call carrying updated ones.
1626 * To do so, the function first assumes that a more recent ctime means
1627 * that the attributes in fattr are newer, however it also attempt to
1628 * catch the case where ctime either didn't change, or went backwards
1629 * (if someone reset the clock on the server) by looking at whether
1630 * or not this RPC call was started after the inode was last updated.
1631 * Note also the check for wraparound of 'attr_gencount'
1633 * The function returns 'true' if it thinks the attributes in 'fattr' are
1634 * more recent than the ones cached in the inode.
1637 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1639 const struct nfs_inode *nfsi = NFS_I(inode);
1641 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1642 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1645 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1649 trace_nfs_refresh_inode_enter(inode);
1651 if (nfs_inode_attrs_need_update(inode, fattr))
1652 ret = nfs_update_inode(inode, fattr);
1654 ret = nfs_check_inode_attributes(inode, fattr);
1656 trace_nfs_refresh_inode_exit(inode, ret);
1661 * nfs_refresh_inode - try to update the inode attribute cache
1662 * @inode: pointer to inode
1663 * @fattr: updated attributes
1665 * Check that an RPC call that returned attributes has not overlapped with
1666 * other recent updates of the inode metadata, then decide whether it is
1667 * safe to do a full update of the inode attributes, or whether just to
1668 * call nfs_check_inode_attributes.
1670 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1674 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1676 spin_lock(&inode->i_lock);
1677 status = nfs_refresh_inode_locked(inode, fattr);
1678 spin_unlock(&inode->i_lock);
1682 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1684 static int nfs_post_op_update_inode_locked(struct inode *inode,
1685 struct nfs_fattr *fattr, unsigned int invalid)
1687 if (S_ISDIR(inode->i_mode))
1688 invalid |= NFS_INO_INVALID_DATA;
1689 nfs_set_cache_invalid(inode, invalid);
1690 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1692 return nfs_refresh_inode_locked(inode, fattr);
1696 * nfs_post_op_update_inode - try to update the inode attribute cache
1697 * @inode: pointer to inode
1698 * @fattr: updated attributes
1700 * After an operation that has changed the inode metadata, mark the
1701 * attribute cache as being invalid, then try to update it.
1703 * NB: if the server didn't return any post op attributes, this
1704 * function will force the retrieval of attributes before the next
1705 * NFS request. Thus it should be used only for operations that
1706 * are expected to change one or more attributes, to avoid
1707 * unnecessary NFS requests and trips through nfs_update_inode().
1709 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1713 spin_lock(&inode->i_lock);
1714 nfs_fattr_set_barrier(fattr);
1715 status = nfs_post_op_update_inode_locked(inode, fattr,
1716 NFS_INO_INVALID_CHANGE
1717 | NFS_INO_INVALID_CTIME
1718 | NFS_INO_REVAL_FORCED);
1719 spin_unlock(&inode->i_lock);
1723 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1726 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1727 * @inode: pointer to inode
1728 * @fattr: updated attributes
1730 * After an operation that has changed the inode metadata, mark the
1731 * attribute cache as being invalid, then try to update it. Fake up
1732 * weak cache consistency data, if none exist.
1734 * This function is mainly designed to be used by the ->write_done() functions.
1736 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1740 /* Don't do a WCC update if these attributes are already stale */
1741 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1742 !nfs_inode_attrs_need_update(inode, fattr)) {
1743 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1744 | NFS_ATTR_FATTR_PRESIZE
1745 | NFS_ATTR_FATTR_PREMTIME
1746 | NFS_ATTR_FATTR_PRECTIME);
1749 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1750 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1751 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1752 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1754 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1755 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1756 fattr->pre_ctime = inode->i_ctime;
1757 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1759 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1760 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1761 fattr->pre_mtime = inode->i_mtime;
1762 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1764 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1765 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1766 fattr->pre_size = i_size_read(inode);
1767 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1770 status = nfs_post_op_update_inode_locked(inode, fattr,
1771 NFS_INO_INVALID_CHANGE
1772 | NFS_INO_INVALID_CTIME
1773 | NFS_INO_INVALID_MTIME
1774 | NFS_INO_INVALID_BLOCKS);
1779 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1780 * @inode: pointer to inode
1781 * @fattr: updated attributes
1783 * After an operation that has changed the inode metadata, mark the
1784 * attribute cache as being invalid, then try to update it. Fake up
1785 * weak cache consistency data, if none exist.
1787 * This function is mainly designed to be used by the ->write_done() functions.
1789 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1793 spin_lock(&inode->i_lock);
1794 nfs_fattr_set_barrier(fattr);
1795 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1796 spin_unlock(&inode->i_lock);
1799 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1803 * Many nfs protocol calls return the new file attributes after
1804 * an operation. Here we update the inode to reflect the state
1805 * of the server's inode.
1807 * This is a bit tricky because we have to make sure all dirty pages
1808 * have been sent off to the server before calling invalidate_inode_pages.
1809 * To make sure no other process adds more write requests while we try
1810 * our best to flush them, we make them sleep during the attribute refresh.
1812 * A very similar scenario holds for the dir cache.
1814 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1816 struct nfs_server *server;
1817 struct nfs_inode *nfsi = NFS_I(inode);
1818 loff_t cur_isize, new_isize;
1819 unsigned long invalid = 0;
1820 unsigned long now = jiffies;
1821 unsigned long save_cache_validity;
1822 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1823 bool cache_revalidated = true;
1824 bool attr_changed = false;
1825 bool have_delegation;
1827 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1828 __func__, inode->i_sb->s_id, inode->i_ino,
1829 nfs_display_fhandle_hash(NFS_FH(inode)),
1830 atomic_read(&inode->i_count), fattr->valid);
1832 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1833 /* Only a mounted-on-fileid? Just exit */
1834 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1836 /* Has the inode gone and changed behind our back? */
1837 } else if (nfsi->fileid != fattr->fileid) {
1838 /* Is this perhaps the mounted-on fileid? */
1839 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1840 nfsi->fileid == fattr->mounted_on_fileid)
1842 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1843 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1844 NFS_SERVER(inode)->nfs_client->cl_hostname,
1845 inode->i_sb->s_id, (long long)nfsi->fileid,
1846 (long long)fattr->fileid);
1851 * Make sure the inode's type hasn't changed.
1853 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1855 * Big trouble! The inode has become a different object.
1857 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1858 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1862 server = NFS_SERVER(inode);
1863 /* Update the fsid? */
1864 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1865 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1866 !IS_AUTOMOUNT(inode))
1867 server->fsid = fattr->fsid;
1869 /* Save the delegation state before clearing cache_validity */
1870 have_delegation = nfs_have_delegated_attributes(inode);
1873 * Update the read time so we don't revalidate too often.
1875 nfsi->read_cache_jiffies = fattr->time_start;
1877 save_cache_validity = nfsi->cache_validity;
1878 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1879 | NFS_INO_INVALID_ATIME
1880 | NFS_INO_REVAL_FORCED
1881 | NFS_INO_REVAL_PAGECACHE
1882 | NFS_INO_INVALID_BLOCKS);
1884 /* Do atomic weak cache consistency updates */
1885 nfs_wcc_update_inode(inode, fattr);
1887 if (pnfs_layoutcommit_outstanding(inode)) {
1888 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1889 cache_revalidated = false;
1892 /* More cache consistency checks */
1893 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1894 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1895 /* Could it be a race with writeback? */
1896 if (!(have_writers || have_delegation)) {
1897 invalid |= NFS_INO_INVALID_DATA
1898 | NFS_INO_INVALID_ACCESS
1899 | NFS_INO_INVALID_ACL
1900 | NFS_INO_INVALID_XATTR;
1901 /* Force revalidate of all attributes */
1902 save_cache_validity |= NFS_INO_INVALID_CTIME
1903 | NFS_INO_INVALID_MTIME
1904 | NFS_INO_INVALID_SIZE
1905 | NFS_INO_INVALID_OTHER;
1906 if (S_ISDIR(inode->i_mode))
1907 nfs_force_lookup_revalidate(inode);
1908 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1911 } else if (!have_delegation)
1912 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1913 inode_set_iversion_raw(inode, fattr->change_attr);
1914 attr_changed = true;
1917 nfsi->cache_validity |= save_cache_validity &
1918 (NFS_INO_INVALID_CHANGE
1919 | NFS_INO_REVAL_PAGECACHE
1920 | NFS_INO_REVAL_FORCED);
1921 cache_revalidated = false;
1924 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1925 inode->i_mtime = fattr->mtime;
1926 } else if (server->caps & NFS_CAP_MTIME) {
1927 nfsi->cache_validity |= save_cache_validity &
1928 (NFS_INO_INVALID_MTIME
1929 | NFS_INO_REVAL_FORCED);
1930 cache_revalidated = false;
1933 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1934 inode->i_ctime = fattr->ctime;
1935 } else if (server->caps & NFS_CAP_CTIME) {
1936 nfsi->cache_validity |= save_cache_validity &
1937 (NFS_INO_INVALID_CTIME
1938 | NFS_INO_REVAL_FORCED);
1939 cache_revalidated = false;
1942 /* Check if our cached file size is stale */
1943 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1944 new_isize = nfs_size_to_loff_t(fattr->size);
1945 cur_isize = i_size_read(inode);
1946 if (new_isize != cur_isize && !have_delegation) {
1947 /* Do we perhaps have any outstanding writes, or has
1948 * the file grown beyond our last write? */
1949 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1950 i_size_write(inode, new_isize);
1952 invalid |= NFS_INO_INVALID_DATA;
1953 attr_changed = true;
1955 dprintk("NFS: isize change on server for file %s/%ld "
1959 (long long)cur_isize,
1960 (long long)new_isize);
1963 nfsi->cache_validity |= save_cache_validity &
1964 (NFS_INO_INVALID_SIZE
1965 | NFS_INO_REVAL_PAGECACHE
1966 | NFS_INO_REVAL_FORCED);
1967 cache_revalidated = false;
1971 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1972 inode->i_atime = fattr->atime;
1973 else if (server->caps & NFS_CAP_ATIME) {
1974 nfsi->cache_validity |= save_cache_validity &
1975 (NFS_INO_INVALID_ATIME
1976 | NFS_INO_REVAL_FORCED);
1977 cache_revalidated = false;
1980 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1981 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1982 umode_t newmode = inode->i_mode & S_IFMT;
1983 newmode |= fattr->mode & S_IALLUGO;
1984 inode->i_mode = newmode;
1985 invalid |= NFS_INO_INVALID_ACCESS
1986 | NFS_INO_INVALID_ACL;
1987 attr_changed = true;
1989 } else if (server->caps & NFS_CAP_MODE) {
1990 nfsi->cache_validity |= save_cache_validity &
1991 (NFS_INO_INVALID_OTHER
1992 | NFS_INO_REVAL_FORCED);
1993 cache_revalidated = false;
1996 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1997 if (!uid_eq(inode->i_uid, fattr->uid)) {
1998 invalid |= NFS_INO_INVALID_ACCESS
1999 | NFS_INO_INVALID_ACL;
2000 inode->i_uid = fattr->uid;
2001 attr_changed = true;
2003 } else if (server->caps & NFS_CAP_OWNER) {
2004 nfsi->cache_validity |= save_cache_validity &
2005 (NFS_INO_INVALID_OTHER
2006 | NFS_INO_REVAL_FORCED);
2007 cache_revalidated = false;
2010 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2011 if (!gid_eq(inode->i_gid, fattr->gid)) {
2012 invalid |= NFS_INO_INVALID_ACCESS
2013 | NFS_INO_INVALID_ACL;
2014 inode->i_gid = fattr->gid;
2015 attr_changed = true;
2017 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
2018 nfsi->cache_validity |= save_cache_validity &
2019 (NFS_INO_INVALID_OTHER
2020 | NFS_INO_REVAL_FORCED);
2021 cache_revalidated = false;
2024 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2025 if (inode->i_nlink != fattr->nlink) {
2026 if (S_ISDIR(inode->i_mode))
2027 invalid |= NFS_INO_INVALID_DATA;
2028 set_nlink(inode, fattr->nlink);
2029 attr_changed = true;
2031 } else if (server->caps & NFS_CAP_NLINK) {
2032 nfsi->cache_validity |= save_cache_validity &
2033 (NFS_INO_INVALID_OTHER
2034 | NFS_INO_REVAL_FORCED);
2035 cache_revalidated = false;
2038 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2040 * report the blocks in 512byte units
2042 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2043 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2044 inode->i_blocks = fattr->du.nfs2.blocks;
2046 nfsi->cache_validity |= save_cache_validity &
2047 (NFS_INO_INVALID_BLOCKS
2048 | NFS_INO_REVAL_FORCED);
2049 cache_revalidated = false;
2052 /* Update attrtimeo value if we're out of the unstable period */
2054 invalid &= ~NFS_INO_INVALID_ATTR;
2055 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2056 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2057 nfsi->attrtimeo_timestamp = now;
2058 /* Set barrier to be more recent than all outstanding updates */
2059 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2061 if (cache_revalidated) {
2062 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2063 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2064 nfsi->attrtimeo <<= 1;
2065 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2066 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2068 nfsi->attrtimeo_timestamp = now;
2070 /* Set the barrier to be more recent than this fattr */
2071 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2072 nfsi->attr_gencount = fattr->gencount;
2075 /* Don't invalidate the data if we were to blame */
2076 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2077 || S_ISLNK(inode->i_mode)))
2078 invalid &= ~NFS_INO_INVALID_DATA;
2079 nfs_set_cache_invalid(inode, invalid);
2084 * No need to worry about unhashing the dentry, as the
2085 * lookup validation will know that the inode is bad.
2086 * (But we fall through to invalidate the caches.)
2088 nfs_set_inode_stale_locked(inode);
2092 struct inode *nfs_alloc_inode(struct super_block *sb)
2094 struct nfs_inode *nfsi;
2095 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2099 nfsi->cache_validity = 0UL;
2100 #if IS_ENABLED(CONFIG_NFS_V4)
2101 nfsi->nfs4_acl = NULL;
2102 #endif /* CONFIG_NFS_V4 */
2103 #ifdef CONFIG_NFS_V4_2
2104 nfsi->xattr_cache = NULL;
2106 return &nfsi->vfs_inode;
2108 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2110 void nfs_free_inode(struct inode *inode)
2112 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2114 EXPORT_SYMBOL_GPL(nfs_free_inode);
2116 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2118 #if IS_ENABLED(CONFIG_NFS_V4)
2119 INIT_LIST_HEAD(&nfsi->open_states);
2120 nfsi->delegation = NULL;
2121 init_rwsem(&nfsi->rwsem);
2122 nfsi->layout = NULL;
2126 static void init_once(void *foo)
2128 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2130 inode_init_once(&nfsi->vfs_inode);
2131 INIT_LIST_HEAD(&nfsi->open_files);
2132 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2133 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2134 INIT_LIST_HEAD(&nfsi->commit_info.list);
2135 atomic_long_set(&nfsi->nrequests, 0);
2136 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2137 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2138 init_rwsem(&nfsi->rmdir_sem);
2139 mutex_init(&nfsi->commit_mutex);
2140 nfs4_init_once(nfsi);
2141 nfsi->cache_change_attribute = 0;
2144 static int __init nfs_init_inodecache(void)
2146 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2147 sizeof(struct nfs_inode),
2148 0, (SLAB_RECLAIM_ACCOUNT|
2149 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2151 if (nfs_inode_cachep == NULL)
2157 static void nfs_destroy_inodecache(void)
2160 * Make sure all delayed rcu free inodes are flushed before we
2164 kmem_cache_destroy(nfs_inode_cachep);
2167 struct workqueue_struct *nfsiod_workqueue;
2168 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2171 * start up the nfsiod workqueue
2173 static int nfsiod_start(void)
2175 struct workqueue_struct *wq;
2176 dprintk("RPC: creating workqueue nfsiod\n");
2177 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2180 nfsiod_workqueue = wq;
2185 * Destroy the nfsiod workqueue
2187 static void nfsiod_stop(void)
2189 struct workqueue_struct *wq;
2191 wq = nfsiod_workqueue;
2194 nfsiod_workqueue = NULL;
2195 destroy_workqueue(wq);
2198 unsigned int nfs_net_id;
2199 EXPORT_SYMBOL_GPL(nfs_net_id);
2201 static int nfs_net_init(struct net *net)
2203 nfs_clients_init(net);
2204 return nfs_fs_proc_net_init(net);
2207 static void nfs_net_exit(struct net *net)
2209 nfs_fs_proc_net_exit(net);
2210 nfs_clients_exit(net);
2213 static struct pernet_operations nfs_net_ops = {
2214 .init = nfs_net_init,
2215 .exit = nfs_net_exit,
2217 .size = sizeof(struct nfs_net),
2223 static int __init init_nfs_fs(void)
2227 err = nfs_sysfs_init();
2231 err = register_pernet_subsys(&nfs_net_ops);
2235 err = nfs_fscache_register();
2239 err = nfsiod_start();
2243 err = nfs_fs_proc_init();
2247 err = nfs_init_nfspagecache();
2251 err = nfs_init_inodecache();
2255 err = nfs_init_readpagecache();
2259 err = nfs_init_writepagecache();
2263 err = nfs_init_directcache();
2267 rpc_proc_register(&init_net, &nfs_rpcstat);
2269 err = register_nfs_fs();
2275 rpc_proc_unregister(&init_net, "nfs");
2276 nfs_destroy_directcache();
2278 nfs_destroy_writepagecache();
2280 nfs_destroy_readpagecache();
2282 nfs_destroy_inodecache();
2284 nfs_destroy_nfspagecache();
2290 nfs_fscache_unregister();
2292 unregister_pernet_subsys(&nfs_net_ops);
2299 static void __exit exit_nfs_fs(void)
2301 nfs_destroy_directcache();
2302 nfs_destroy_writepagecache();
2303 nfs_destroy_readpagecache();
2304 nfs_destroy_inodecache();
2305 nfs_destroy_nfspagecache();
2306 nfs_fscache_unregister();
2307 unregister_pernet_subsys(&nfs_net_ops);
2308 rpc_proc_unregister(&init_net, "nfs");
2309 unregister_nfs_fs();
2315 /* Not quite true; I just maintain it */
2316 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2317 MODULE_LICENSE("GPL");
2318 module_param(enable_ino64, bool, 0644);
2320 module_init(init_nfs_fs)
2321 module_exit(exit_nfs_fs)