1 // SPDX-License-Identifier: GPL-2.0-only
5 * Copyright (C) 1992 Rick Sladkey
7 * nfs inode and superblock handling functions
10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
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 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
78 if (signal_pending_state(mode, current))
82 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
85 * nfs_compat_user_ino64 - returns the user-visible inode number
86 * @fileid: 64-bit fileid
88 * This function returns a 32-bit inode number if the boot parameter
89 * nfs.enable_ino64 is zero.
91 u64 nfs_compat_user_ino64(u64 fileid)
102 if (sizeof(ino) < sizeof(fileid))
103 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
107 int nfs_drop_inode(struct inode *inode)
109 return NFS_STALE(inode) || generic_drop_inode(inode);
111 EXPORT_SYMBOL_GPL(nfs_drop_inode);
113 void nfs_clear_inode(struct inode *inode)
116 * The following should never happen...
118 WARN_ON_ONCE(nfs_have_writebacks(inode));
119 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
120 nfs_zap_acl_cache(inode);
121 nfs_access_zap_cache(inode);
122 nfs_fscache_clear_inode(inode);
124 EXPORT_SYMBOL_GPL(nfs_clear_inode);
126 void nfs_evict_inode(struct inode *inode)
128 truncate_inode_pages_final(&inode->i_data);
130 nfs_clear_inode(inode);
133 int nfs_sync_inode(struct inode *inode)
135 inode_dio_wait(inode);
136 return nfs_wb_all(inode);
138 EXPORT_SYMBOL_GPL(nfs_sync_inode);
141 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
142 * @mapping: pointer to struct address_space
144 int nfs_sync_mapping(struct address_space *mapping)
148 if (mapping->nrpages != 0) {
149 unmap_mapping_range(mapping, 0, 0, 0);
150 ret = nfs_wb_all(mapping->host);
155 static int nfs_attribute_timeout(struct inode *inode)
157 struct nfs_inode *nfsi = NFS_I(inode);
159 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
162 static bool nfs_check_cache_flags_invalid(struct inode *inode,
165 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
167 return (cache_validity & flags) != 0;
170 bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
172 if (nfs_check_cache_flags_invalid(inode, flags))
174 return nfs_attribute_cache_expired(inode);
176 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
178 #ifdef CONFIG_NFS_V4_2
179 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
181 return nfsi->xattr_cache != NULL;
184 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
190 void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
192 struct nfs_inode *nfsi = NFS_I(inode);
193 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
195 if (have_delegation) {
196 if (!(flags & NFS_INO_REVAL_FORCED))
197 flags &= ~(NFS_INO_INVALID_MODE |
198 NFS_INO_INVALID_OTHER |
199 NFS_INO_INVALID_XATTR);
200 flags &= ~(NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
203 if (!nfs_has_xattr_cache(nfsi))
204 flags &= ~NFS_INO_INVALID_XATTR;
205 if (flags & NFS_INO_INVALID_DATA)
206 nfs_fscache_invalidate(inode, 0);
207 flags &= ~NFS_INO_REVAL_FORCED;
209 nfsi->cache_validity |= flags;
211 if (inode->i_mapping->nrpages == 0)
212 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA |
213 NFS_INO_DATA_INVAL_DEFER);
214 else if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
215 nfsi->cache_validity &= ~NFS_INO_DATA_INVAL_DEFER;
216 trace_nfs_set_cache_invalid(inode, 0);
218 EXPORT_SYMBOL_GPL(nfs_set_cache_invalid);
221 * Invalidate the local caches
223 static void nfs_zap_caches_locked(struct inode *inode)
225 struct nfs_inode *nfsi = NFS_I(inode);
226 int mode = inode->i_mode;
228 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
230 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
231 nfsi->attrtimeo_timestamp = jiffies;
233 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode))
234 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR |
235 NFS_INO_INVALID_DATA |
236 NFS_INO_INVALID_ACCESS |
237 NFS_INO_INVALID_ACL |
238 NFS_INO_INVALID_XATTR);
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_zap_label_cache_locked(nfsi);
247 void nfs_zap_caches(struct inode *inode)
249 spin_lock(&inode->i_lock);
250 nfs_zap_caches_locked(inode);
251 spin_unlock(&inode->i_lock);
254 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
256 if (mapping->nrpages != 0) {
257 spin_lock(&inode->i_lock);
258 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
259 spin_unlock(&inode->i_lock);
263 void nfs_zap_acl_cache(struct inode *inode)
265 void (*clear_acl_cache)(struct inode *);
267 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
268 if (clear_acl_cache != NULL)
269 clear_acl_cache(inode);
270 spin_lock(&inode->i_lock);
271 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
272 spin_unlock(&inode->i_lock);
274 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
276 void nfs_invalidate_atime(struct inode *inode)
278 spin_lock(&inode->i_lock);
279 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
280 spin_unlock(&inode->i_lock);
282 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
285 * Invalidate, but do not unhash, the inode.
286 * NB: must be called with inode->i_lock held!
288 static void nfs_set_inode_stale_locked(struct inode *inode)
290 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
291 nfs_zap_caches_locked(inode);
292 trace_nfs_set_inode_stale(inode);
295 void nfs_set_inode_stale(struct inode *inode)
297 spin_lock(&inode->i_lock);
298 nfs_set_inode_stale_locked(inode);
299 spin_unlock(&inode->i_lock);
302 struct nfs_find_desc {
304 struct nfs_fattr *fattr;
308 * In NFSv3 we can have 64bit inode numbers. In order to support
309 * this, and re-exported directories (also seen in NFSv2)
310 * we are forced to allow 2 different inodes to have the same
314 nfs_find_actor(struct inode *inode, void *opaque)
316 struct nfs_find_desc *desc = opaque;
317 struct nfs_fh *fh = desc->fh;
318 struct nfs_fattr *fattr = desc->fattr;
320 if (NFS_FILEID(inode) != fattr->fileid)
322 if (inode_wrong_type(inode, fattr->mode))
324 if (nfs_compare_fh(NFS_FH(inode), fh))
326 if (is_bad_inode(inode) || NFS_STALE(inode))
332 nfs_init_locked(struct inode *inode, void *opaque)
334 struct nfs_find_desc *desc = opaque;
335 struct nfs_fattr *fattr = desc->fattr;
337 set_nfs_fileid(inode, fattr->fileid);
338 inode->i_mode = fattr->mode;
339 nfs_copy_fh(NFS_FH(inode), desc->fh);
343 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
344 static void nfs_clear_label_invalid(struct inode *inode)
346 spin_lock(&inode->i_lock);
347 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
348 spin_unlock(&inode->i_lock);
351 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
355 if (fattr->label == NULL)
358 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
359 error = security_inode_notifysecctx(inode, fattr->label->label,
362 printk(KERN_ERR "%s() %s %d "
363 "security_inode_notifysecctx() %d\n",
365 (char *)fattr->label->label,
366 fattr->label->len, error);
367 nfs_clear_label_invalid(inode);
371 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
373 struct nfs4_label *label;
375 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
378 label = kzalloc(sizeof(struct nfs4_label), flags);
380 return ERR_PTR(-ENOMEM);
382 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
383 if (label->label == NULL) {
385 return ERR_PTR(-ENOMEM);
387 label->len = NFS4_MAXLABELLEN;
391 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
393 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr)
397 EXPORT_SYMBOL_GPL(nfs_setsecurity);
399 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
401 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
403 struct nfs_find_desc desc = {
410 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
411 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
414 hash = nfs_fattr_to_ino_t(fattr);
415 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
417 dprintk("%s: returning %p\n", __func__, inode);
421 static void nfs_inode_init_regular(struct nfs_inode *nfsi)
423 atomic_long_set(&nfsi->nrequests, 0);
424 atomic_long_set(&nfsi->redirtied_pages, 0);
425 INIT_LIST_HEAD(&nfsi->commit_info.list);
426 atomic_long_set(&nfsi->commit_info.ncommit, 0);
427 atomic_set(&nfsi->commit_info.rpcs_out, 0);
428 mutex_init(&nfsi->commit_mutex);
431 static void nfs_inode_init_dir(struct nfs_inode *nfsi)
433 nfsi->cache_change_attribute = 0;
434 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
435 init_rwsem(&nfsi->rmdir_sem);
439 * This is our front-end to iget that looks up inodes by file handle
440 * instead of inode number.
443 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr)
445 struct nfs_find_desc desc = {
449 struct inode *inode = ERR_PTR(-ENOENT);
450 u64 fattr_supported = NFS_SB(sb)->fattr_valid;
453 nfs_attr_check_mountpoint(sb, fattr);
455 if (nfs_attr_use_mounted_on_fileid(fattr))
456 fattr->fileid = fattr->mounted_on_fileid;
457 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
459 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
462 hash = nfs_fattr_to_ino_t(fattr);
464 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
466 inode = ERR_PTR(-ENOMEM);
470 if (inode->i_state & I_NEW) {
471 struct nfs_inode *nfsi = NFS_I(inode);
472 unsigned long now = jiffies;
474 /* We set i_ino for the few things that still rely on it,
478 /* We can't support update_atime(), since the server will reset it */
479 inode->i_flags |= S_NOATIME|S_NOCMTIME;
480 inode->i_mode = fattr->mode;
481 nfsi->cache_validity = 0;
482 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
483 && (fattr_supported & NFS_ATTR_FATTR_MODE))
484 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MODE);
485 /* Why so? Because we want revalidate for devices/FIFOs, and
486 * that's precisely what we have in nfs_file_inode_operations.
488 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
489 if (S_ISREG(inode->i_mode)) {
490 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
491 inode->i_data.a_ops = &nfs_file_aops;
492 nfs_inode_init_regular(nfsi);
493 } else if (S_ISDIR(inode->i_mode)) {
494 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
495 inode->i_fop = &nfs_dir_operations;
496 inode->i_data.a_ops = &nfs_dir_aops;
497 nfs_inode_init_dir(nfsi);
498 /* Deal with crossing mountpoints */
499 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
500 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
501 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
502 inode->i_op = &nfs_referral_inode_operations;
504 inode->i_op = &nfs_mountpoint_inode_operations;
506 inode->i_flags |= S_AUTOMOUNT;
508 } else if (S_ISLNK(inode->i_mode)) {
509 inode->i_op = &nfs_symlink_inode_operations;
510 inode_nohighmem(inode);
512 init_special_inode(inode, inode->i_mode, fattr->rdev);
514 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
515 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
516 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
517 inode_set_iversion_raw(inode, 0);
520 inode->i_uid = make_kuid(&init_user_ns, -2);
521 inode->i_gid = make_kgid(&init_user_ns, -2);
526 nfsi->read_cache_jiffies = fattr->time_start;
527 nfsi->attr_gencount = fattr->gencount;
528 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
529 inode->i_atime = fattr->atime;
530 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
531 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
532 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
533 inode->i_mtime = fattr->mtime;
534 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
535 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
536 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
537 inode->i_ctime = fattr->ctime;
538 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
539 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
540 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
541 inode_set_iversion_raw(inode, fattr->change_attr);
543 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
544 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
545 inode->i_size = nfs_size_to_loff_t(fattr->size);
547 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
548 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
549 set_nlink(inode, fattr->nlink);
550 else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
551 nfs_set_cache_invalid(inode, NFS_INO_INVALID_NLINK);
552 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
553 inode->i_uid = fattr->uid;
554 else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
555 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
556 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
557 inode->i_gid = fattr->gid;
558 else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
559 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
560 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
561 inode->i_blocks = fattr->du.nfs2.blocks;
562 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED &&
564 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
565 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
567 * report the blocks in 512byte units
569 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
570 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED &&
572 nfs_set_cache_invalid(inode, NFS_INO_INVALID_BLOCKS);
574 nfs_setsecurity(inode, fattr);
576 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
577 nfsi->attrtimeo_timestamp = now;
578 nfsi->access_cache = RB_ROOT;
580 nfs_fscache_init_inode(inode);
582 unlock_new_inode(inode);
584 int err = nfs_refresh_inode(inode, fattr);
587 inode = ERR_PTR(err);
591 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
593 (unsigned long long)NFS_FILEID(inode),
594 nfs_display_fhandle_hash(fh),
595 atomic_read(&inode->i_count));
601 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
604 EXPORT_SYMBOL_GPL(nfs_fhget);
606 #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)
609 nfs_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
612 struct inode *inode = d_inode(dentry);
613 struct nfs_fattr *fattr;
616 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
618 /* skip mode change if it's just for clearing setuid/setgid */
619 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
620 attr->ia_valid &= ~ATTR_MODE;
622 if (attr->ia_valid & ATTR_SIZE) {
623 BUG_ON(!S_ISREG(inode->i_mode));
625 error = inode_newsize_ok(inode, attr->ia_size);
629 if (attr->ia_size == i_size_read(inode))
630 attr->ia_valid &= ~ATTR_SIZE;
633 /* Optimization: if the end result is no change, don't RPC */
634 if (((attr->ia_valid & NFS_VALID_ATTRS) & ~(ATTR_FILE|ATTR_OPEN)) == 0)
637 trace_nfs_setattr_enter(inode);
639 /* Write all dirty data */
640 if (S_ISREG(inode->i_mode))
641 nfs_sync_inode(inode);
643 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
649 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
651 error = nfs_refresh_inode(inode, fattr);
652 nfs_free_fattr(fattr);
654 trace_nfs_setattr_exit(inode, error);
657 EXPORT_SYMBOL_GPL(nfs_setattr);
660 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
661 * @inode: inode of the file used
662 * @offset: file offset to start truncating
664 * This is a copy of the common vmtruncate, but with the locking
665 * corrected to take into account the fact that NFS requires
666 * inode->i_size to be updated under the inode->i_lock.
667 * Note: must be called with inode->i_lock held!
669 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
673 err = inode_newsize_ok(inode, offset);
677 trace_nfs_size_truncate(inode, offset);
678 i_size_write(inode, offset);
681 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
682 NFS_INO_DATA_INVAL_DEFER);
683 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
685 spin_unlock(&inode->i_lock);
686 truncate_pagecache(inode, offset);
687 spin_lock(&inode->i_lock);
693 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
694 * @inode: pointer to struct inode
695 * @attr: pointer to struct iattr
696 * @fattr: pointer to struct nfs_fattr
698 * Note: we do this in the *proc.c in order to ensure that
699 * it works for things like exclusive creates too.
701 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
702 struct nfs_fattr *fattr)
704 /* Barrier: bump the attribute generation count. */
705 nfs_fattr_set_barrier(fattr);
707 spin_lock(&inode->i_lock);
708 NFS_I(inode)->attr_gencount = fattr->gencount;
709 if ((attr->ia_valid & ATTR_SIZE) != 0) {
710 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME |
711 NFS_INO_INVALID_BLOCKS);
712 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
713 nfs_vmtruncate(inode, attr->ia_size);
715 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
716 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
717 if ((attr->ia_valid & ATTR_KILL_SUID) != 0 &&
718 inode->i_mode & S_ISUID)
719 inode->i_mode &= ~S_ISUID;
720 if ((attr->ia_valid & ATTR_KILL_SGID) != 0 &&
721 (inode->i_mode & (S_ISGID | S_IXGRP)) ==
723 inode->i_mode &= ~S_ISGID;
724 if ((attr->ia_valid & ATTR_MODE) != 0) {
725 int mode = attr->ia_mode & S_IALLUGO;
726 mode |= inode->i_mode & ~S_IALLUGO;
727 inode->i_mode = mode;
729 if ((attr->ia_valid & ATTR_UID) != 0)
730 inode->i_uid = attr->ia_uid;
731 if ((attr->ia_valid & ATTR_GID) != 0)
732 inode->i_gid = attr->ia_gid;
733 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
734 inode->i_ctime = fattr->ctime;
736 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
737 | NFS_INO_INVALID_CTIME);
738 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
739 | NFS_INO_INVALID_ACL);
741 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
742 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
743 | NFS_INO_INVALID_CTIME);
744 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
745 inode->i_atime = fattr->atime;
746 else if (attr->ia_valid & ATTR_ATIME_SET)
747 inode->i_atime = attr->ia_atime;
749 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
751 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
752 inode->i_ctime = fattr->ctime;
754 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
755 | NFS_INO_INVALID_CTIME);
757 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
758 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
759 | NFS_INO_INVALID_CTIME);
760 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
761 inode->i_mtime = fattr->mtime;
762 else if (attr->ia_valid & ATTR_MTIME_SET)
763 inode->i_mtime = attr->ia_mtime;
765 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
767 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
768 inode->i_ctime = fattr->ctime;
770 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
771 | NFS_INO_INVALID_CTIME);
774 nfs_update_inode(inode, fattr);
775 spin_unlock(&inode->i_lock);
777 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
780 * Don't request help from readdirplus if the file is being written to,
781 * or if attribute caching is turned off
783 static bool nfs_getattr_readdirplus_enable(const struct inode *inode)
785 return nfs_server_capable(inode, NFS_CAP_READDIRPLUS) &&
786 !nfs_have_writebacks(inode) && NFS_MAXATTRTIMEO(inode) > 5 * HZ;
789 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
791 if (!IS_ROOT(dentry)) {
792 struct dentry *parent = dget_parent(dentry);
793 nfs_readdir_record_entry_cache_miss(d_inode(parent));
798 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
800 if (!IS_ROOT(dentry)) {
801 struct dentry *parent = dget_parent(dentry);
802 nfs_readdir_record_entry_cache_hit(d_inode(parent));
807 static u32 nfs_get_valid_attrmask(struct inode *inode)
809 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
810 u32 reply_mask = STATX_INO | STATX_TYPE;
812 if (!(cache_validity & NFS_INO_INVALID_ATIME))
813 reply_mask |= STATX_ATIME;
814 if (!(cache_validity & NFS_INO_INVALID_CTIME))
815 reply_mask |= STATX_CTIME;
816 if (!(cache_validity & NFS_INO_INVALID_MTIME))
817 reply_mask |= STATX_MTIME;
818 if (!(cache_validity & NFS_INO_INVALID_SIZE))
819 reply_mask |= STATX_SIZE;
820 if (!(cache_validity & NFS_INO_INVALID_NLINK))
821 reply_mask |= STATX_NLINK;
822 if (!(cache_validity & NFS_INO_INVALID_MODE))
823 reply_mask |= STATX_MODE;
824 if (!(cache_validity & NFS_INO_INVALID_OTHER))
825 reply_mask |= STATX_UID | STATX_GID;
826 if (!(cache_validity & NFS_INO_INVALID_BLOCKS))
827 reply_mask |= STATX_BLOCKS;
831 int nfs_getattr(struct user_namespace *mnt_userns, const struct path *path,
832 struct kstat *stat, u32 request_mask, unsigned int query_flags)
834 struct inode *inode = d_inode(path->dentry);
835 struct nfs_server *server = NFS_SERVER(inode);
836 unsigned long cache_validity;
838 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
839 bool do_update = false;
840 bool readdirplus_enabled = nfs_getattr_readdirplus_enable(inode);
842 trace_nfs_getattr_enter(inode);
844 request_mask &= STATX_TYPE | STATX_MODE | STATX_NLINK | STATX_UID |
845 STATX_GID | STATX_ATIME | STATX_MTIME | STATX_CTIME |
846 STATX_INO | STATX_SIZE | STATX_BLOCKS;
848 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
849 if (readdirplus_enabled)
850 nfs_readdirplus_parent_cache_hit(path->dentry);
851 goto out_no_revalidate;
854 /* Flush out writes to the server in order to update c/mtime. */
855 if ((request_mask & (STATX_CTIME | STATX_MTIME)) &&
856 S_ISREG(inode->i_mode))
857 filemap_write_and_wait(inode->i_mapping);
860 * We may force a getattr if the user cares about atime.
862 * Note that we only have to check the vfsmount flags here:
863 * - NFS always sets S_NOATIME by so checking it would give a
865 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
866 * no point in checking those.
868 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
869 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
870 request_mask &= ~STATX_ATIME;
872 /* Is the user requesting attributes that might need revalidation? */
873 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
874 STATX_MTIME|STATX_UID|STATX_GID|
875 STATX_SIZE|STATX_BLOCKS)))
876 goto out_no_revalidate;
878 /* Check whether the cached attributes are stale */
879 do_update |= force_sync || nfs_attribute_cache_expired(inode);
880 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
881 do_update |= cache_validity & NFS_INO_INVALID_CHANGE;
882 if (request_mask & STATX_ATIME)
883 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
884 if (request_mask & STATX_CTIME)
885 do_update |= cache_validity & NFS_INO_INVALID_CTIME;
886 if (request_mask & STATX_MTIME)
887 do_update |= cache_validity & NFS_INO_INVALID_MTIME;
888 if (request_mask & STATX_SIZE)
889 do_update |= cache_validity & NFS_INO_INVALID_SIZE;
890 if (request_mask & STATX_NLINK)
891 do_update |= cache_validity & NFS_INO_INVALID_NLINK;
892 if (request_mask & STATX_MODE)
893 do_update |= cache_validity & NFS_INO_INVALID_MODE;
894 if (request_mask & (STATX_UID | STATX_GID))
895 do_update |= cache_validity & NFS_INO_INVALID_OTHER;
896 if (request_mask & STATX_BLOCKS)
897 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
900 if (readdirplus_enabled)
901 nfs_readdirplus_parent_cache_miss(path->dentry);
902 err = __nfs_revalidate_inode(server, inode);
905 } else if (readdirplus_enabled)
906 nfs_readdirplus_parent_cache_hit(path->dentry);
908 /* Only return attributes that were revalidated. */
909 stat->result_mask = nfs_get_valid_attrmask(inode) | request_mask;
911 generic_fillattr(&init_user_ns, inode, stat);
912 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
913 if (S_ISDIR(inode->i_mode))
914 stat->blksize = NFS_SERVER(inode)->dtsize;
916 trace_nfs_getattr_exit(inode, err);
919 EXPORT_SYMBOL_GPL(nfs_getattr);
921 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
923 refcount_set(&l_ctx->count, 1);
924 l_ctx->lockowner = current->files;
925 INIT_LIST_HEAD(&l_ctx->list);
926 atomic_set(&l_ctx->io_count, 0);
929 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
931 struct nfs_lock_context *pos;
933 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
934 if (pos->lockowner != current->files)
936 if (refcount_inc_not_zero(&pos->count))
942 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
944 struct nfs_lock_context *res, *new = NULL;
945 struct inode *inode = d_inode(ctx->dentry);
948 res = __nfs_find_lock_context(ctx);
951 new = kmalloc(sizeof(*new), GFP_KERNEL_ACCOUNT);
953 return ERR_PTR(-ENOMEM);
954 nfs_init_lock_context(new);
955 spin_lock(&inode->i_lock);
956 res = __nfs_find_lock_context(ctx);
958 new->open_context = get_nfs_open_context(ctx);
959 if (new->open_context) {
960 list_add_tail_rcu(&new->list,
961 &ctx->lock_context.list);
965 res = ERR_PTR(-EBADF);
967 spin_unlock(&inode->i_lock);
972 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
974 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
976 struct nfs_open_context *ctx = l_ctx->open_context;
977 struct inode *inode = d_inode(ctx->dentry);
979 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
981 list_del_rcu(&l_ctx->list);
982 spin_unlock(&inode->i_lock);
983 put_nfs_open_context(ctx);
984 kfree_rcu(l_ctx, rcu_head);
986 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
989 * nfs_close_context - Common close_context() routine NFSv2/v3
990 * @ctx: pointer to context
991 * @is_sync: is this a synchronous close
993 * Ensure that the attributes are up to date if we're mounted
994 * with close-to-open semantics and we have cached data that will
995 * need to be revalidated on open.
997 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
999 struct nfs_inode *nfsi;
1000 struct inode *inode;
1002 if (!(ctx->mode & FMODE_WRITE))
1006 inode = d_inode(ctx->dentry);
1007 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1009 nfsi = NFS_I(inode);
1010 if (inode->i_mapping->nrpages == 0)
1012 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1014 if (!list_empty(&nfsi->open_files))
1016 if (NFS_SERVER(inode)->flags & NFS_MOUNT_NOCTO)
1018 nfs_revalidate_inode(inode,
1019 NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE);
1021 EXPORT_SYMBOL_GPL(nfs_close_context);
1023 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
1027 struct nfs_open_context *ctx;
1029 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT);
1031 return ERR_PTR(-ENOMEM);
1032 nfs_sb_active(dentry->d_sb);
1033 ctx->dentry = dget(dentry);
1035 ctx->cred = get_cred(filp->f_cred);
1037 ctx->cred = get_current_cred();
1038 rcu_assign_pointer(ctx->ll_cred, NULL);
1043 ctx->flock_owner = (fl_owner_t)filp;
1044 nfs_init_lock_context(&ctx->lock_context);
1045 ctx->lock_context.open_context = ctx;
1046 INIT_LIST_HEAD(&ctx->list);
1047 ctx->mdsthreshold = NULL;
1050 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1052 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1054 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1058 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1060 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1062 struct inode *inode = d_inode(ctx->dentry);
1063 struct super_block *sb = ctx->dentry->d_sb;
1065 if (!refcount_dec_and_test(&ctx->lock_context.count))
1067 if (!list_empty(&ctx->list)) {
1068 spin_lock(&inode->i_lock);
1069 list_del_rcu(&ctx->list);
1070 spin_unlock(&inode->i_lock);
1073 NFS_PROTO(inode)->close_context(ctx, is_sync);
1074 put_cred(ctx->cred);
1076 nfs_sb_deactive(sb);
1077 put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
1078 kfree(ctx->mdsthreshold);
1079 kfree_rcu(ctx, rcu_head);
1082 void put_nfs_open_context(struct nfs_open_context *ctx)
1084 __put_nfs_open_context(ctx, 0);
1086 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1088 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1090 __put_nfs_open_context(ctx, 1);
1094 * Ensure that mmap has a recent RPC credential for use when writing out
1097 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1099 struct inode *inode = d_inode(ctx->dentry);
1100 struct nfs_inode *nfsi = NFS_I(inode);
1102 spin_lock(&inode->i_lock);
1103 if (list_empty(&nfsi->open_files) &&
1104 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1105 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA |
1106 NFS_INO_REVAL_FORCED);
1107 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1108 spin_unlock(&inode->i_lock);
1110 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1112 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1114 filp->private_data = get_nfs_open_context(ctx);
1115 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1116 if (list_empty(&ctx->list))
1117 nfs_inode_attach_open_context(ctx);
1119 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1122 * Given an inode, search for an open context with the desired characteristics
1124 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1126 struct nfs_inode *nfsi = NFS_I(inode);
1127 struct nfs_open_context *pos, *ctx = NULL;
1130 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1131 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1133 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1135 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1137 ctx = get_nfs_open_context(pos);
1145 void nfs_file_clear_open_context(struct file *filp)
1147 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1150 struct inode *inode = d_inode(ctx->dentry);
1152 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1154 * We fatal error on write before. Try to writeback
1158 invalidate_inode_pages2(inode->i_mapping);
1159 filp->private_data = NULL;
1160 put_nfs_open_context_sync(ctx);
1165 * These allocate and release file read/write context information.
1167 int nfs_open(struct inode *inode, struct file *filp)
1169 struct nfs_open_context *ctx;
1171 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1173 return PTR_ERR(ctx);
1174 nfs_file_set_open_context(filp, ctx);
1175 put_nfs_open_context(ctx);
1176 nfs_fscache_open_file(inode, filp);
1181 * This function is called whenever some part of NFS notices that
1182 * the cached attributes have to be refreshed.
1185 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1187 int status = -ESTALE;
1188 struct nfs_fattr *fattr = NULL;
1189 struct nfs_inode *nfsi = NFS_I(inode);
1191 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1192 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1194 trace_nfs_revalidate_inode_enter(inode);
1196 if (is_bad_inode(inode))
1198 if (NFS_STALE(inode))
1201 /* pNFS: Attributes aren't updated until we layoutcommit */
1202 if (S_ISREG(inode->i_mode)) {
1203 status = pnfs_sync_inode(inode, false);
1209 fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode));
1213 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1215 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr, inode);
1217 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1219 (unsigned long long)NFS_FILEID(inode), status);
1222 /* A soft timeout occurred. Use cached information? */
1223 if (server->flags & NFS_MOUNT_SOFTREVAL)
1227 if (!S_ISDIR(inode->i_mode))
1228 nfs_set_inode_stale(inode);
1230 nfs_zap_caches(inode);
1235 status = nfs_refresh_inode(inode, fattr);
1237 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1239 (unsigned long long)NFS_FILEID(inode), status);
1243 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1244 nfs_zap_acl_cache(inode);
1246 nfs_setsecurity(inode, fattr);
1248 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1250 (unsigned long long)NFS_FILEID(inode));
1253 nfs_free_fattr(fattr);
1254 trace_nfs_revalidate_inode_exit(inode, status);
1258 int nfs_attribute_cache_expired(struct inode *inode)
1260 if (nfs_have_delegated_attributes(inode))
1262 return nfs_attribute_timeout(inode);
1266 * nfs_revalidate_inode - Revalidate the inode attributes
1267 * @inode: pointer to inode struct
1268 * @flags: cache flags to check
1270 * Updates inode attribute information by retrieving the data from the server.
1272 int nfs_revalidate_inode(struct inode *inode, unsigned long flags)
1274 if (!nfs_check_cache_invalid(inode, flags))
1275 return NFS_STALE(inode) ? -ESTALE : 0;
1276 return __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1278 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1280 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1284 nfs_fscache_invalidate(inode, 0);
1285 if (mapping->nrpages != 0) {
1286 if (S_ISREG(inode->i_mode)) {
1287 ret = nfs_sync_mapping(mapping);
1291 ret = invalidate_inode_pages2(mapping);
1295 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1297 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1299 (unsigned long long)NFS_FILEID(inode));
1304 * nfs_clear_invalid_mapping - Conditionally clear a mapping
1305 * @mapping: pointer to mapping
1307 * If the NFS_INO_INVALID_DATA inode flag is set, clear the mapping.
1309 int nfs_clear_invalid_mapping(struct address_space *mapping)
1311 struct inode *inode = mapping->host;
1312 struct nfs_inode *nfsi = NFS_I(inode);
1313 unsigned long *bitlock = &nfsi->flags;
1317 * We must clear NFS_INO_INVALID_DATA first to ensure that
1318 * invalidations that come in while we're shooting down the mappings
1319 * are respected. But, that leaves a race window where one revalidator
1320 * can clear the flag, and then another checks it before the mapping
1321 * gets invalidated. Fix that by serializing access to this part of
1324 * At the same time, we need to allow other tasks to see whether we
1325 * might be in the middle of invalidating the pages, so we only set
1326 * the bit lock here if it looks like we're going to be doing that.
1329 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1330 nfs_wait_bit_killable,
1331 TASK_KILLABLE|TASK_FREEZABLE_UNSAFE);
1334 spin_lock(&inode->i_lock);
1335 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1336 spin_unlock(&inode->i_lock);
1339 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1341 spin_unlock(&inode->i_lock);
1345 set_bit(NFS_INO_INVALIDATING, bitlock);
1347 nfsi->cache_validity &=
1348 ~(NFS_INO_INVALID_DATA | NFS_INO_DATA_INVAL_DEFER);
1349 spin_unlock(&inode->i_lock);
1350 trace_nfs_invalidate_mapping_enter(inode);
1351 ret = nfs_invalidate_mapping(inode, mapping);
1352 trace_nfs_invalidate_mapping_exit(inode, ret);
1354 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1355 smp_mb__after_atomic();
1356 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1361 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1363 return nfs_check_cache_invalid(inode, NFS_INO_INVALID_CHANGE) ||
1367 int nfs_revalidate_mapping_rcu(struct inode *inode)
1369 struct nfs_inode *nfsi = NFS_I(inode);
1370 unsigned long *bitlock = &nfsi->flags;
1373 if (IS_SWAPFILE(inode))
1375 if (nfs_mapping_need_revalidate_inode(inode)) {
1379 spin_lock(&inode->i_lock);
1380 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1381 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1383 spin_unlock(&inode->i_lock);
1389 * nfs_revalidate_mapping - Revalidate the pagecache
1390 * @inode: pointer to host inode
1391 * @mapping: pointer to mapping
1393 int nfs_revalidate_mapping(struct inode *inode, struct address_space *mapping)
1395 /* swapfiles are not supposed to be shared. */
1396 if (IS_SWAPFILE(inode))
1399 if (nfs_mapping_need_revalidate_inode(inode)) {
1400 int ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1405 return nfs_clear_invalid_mapping(mapping);
1408 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1410 struct inode *inode = &nfsi->vfs_inode;
1412 if (!S_ISREG(inode->i_mode))
1414 if (list_empty(&nfsi->open_files))
1416 return inode_is_open_for_write(inode);
1419 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1421 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1424 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1426 struct timespec64 ts;
1428 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1429 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1430 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1431 inode_set_iversion_raw(inode, fattr->change_attr);
1432 if (S_ISDIR(inode->i_mode))
1433 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1434 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1435 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1437 /* If we have atomic WCC data, we may update some attributes */
1438 ts = inode->i_ctime;
1439 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1440 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1441 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1442 inode->i_ctime = fattr->ctime;
1445 ts = inode->i_mtime;
1446 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1447 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1448 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1449 inode->i_mtime = fattr->mtime;
1451 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1452 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1453 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1454 && !nfs_have_writebacks(inode)) {
1455 trace_nfs_size_wcc(inode, fattr->size);
1456 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1461 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1462 * @inode: pointer to inode
1463 * @fattr: updated attributes
1465 * Verifies the attribute cache. If we have just changed the attributes,
1466 * so that fattr carries weak cache consistency data, then it may
1467 * also update the ctime/mtime/change_attribute.
1469 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1471 struct nfs_inode *nfsi = NFS_I(inode);
1472 loff_t cur_size, new_isize;
1473 unsigned long invalid = 0;
1474 struct timespec64 ts;
1476 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1479 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1480 /* Only a mounted-on-fileid? Just exit */
1481 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1483 /* Has the inode gone and changed behind our back? */
1484 } else if (nfsi->fileid != fattr->fileid) {
1485 /* Is this perhaps the mounted-on fileid? */
1486 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1487 nfsi->fileid == fattr->mounted_on_fileid)
1491 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1495 if (!nfs_file_has_buffered_writers(nfsi)) {
1496 /* Verify a few of the more important attributes */
1497 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1498 invalid |= NFS_INO_INVALID_CHANGE;
1500 ts = inode->i_mtime;
1501 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1502 invalid |= NFS_INO_INVALID_MTIME;
1504 ts = inode->i_ctime;
1505 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1506 invalid |= NFS_INO_INVALID_CTIME;
1508 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1509 cur_size = i_size_read(inode);
1510 new_isize = nfs_size_to_loff_t(fattr->size);
1511 if (cur_size != new_isize)
1512 invalid |= NFS_INO_INVALID_SIZE;
1516 /* Have any file permissions changed? */
1517 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1518 invalid |= NFS_INO_INVALID_MODE;
1519 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1520 invalid |= NFS_INO_INVALID_OTHER;
1521 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1522 invalid |= NFS_INO_INVALID_OTHER;
1524 /* Has the link count changed? */
1525 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1526 invalid |= NFS_INO_INVALID_NLINK;
1528 ts = inode->i_atime;
1529 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1530 invalid |= NFS_INO_INVALID_ATIME;
1533 nfs_set_cache_invalid(inode, invalid);
1535 nfsi->read_cache_jiffies = fattr->time_start;
1539 static atomic_long_t nfs_attr_generation_counter;
1541 static unsigned long nfs_read_attr_generation_counter(void)
1543 return atomic_long_read(&nfs_attr_generation_counter);
1546 unsigned long nfs_inc_attr_generation_counter(void)
1548 return atomic_long_inc_return(&nfs_attr_generation_counter);
1550 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1552 void nfs_fattr_init(struct nfs_fattr *fattr)
1555 fattr->time_start = jiffies;
1556 fattr->gencount = nfs_inc_attr_generation_counter();
1557 fattr->owner_name = NULL;
1558 fattr->group_name = NULL;
1560 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1563 * nfs_fattr_set_barrier
1564 * @fattr: attributes
1566 * Used to set a barrier after an attribute was updated. This
1567 * barrier ensures that older attributes from RPC calls that may
1568 * have raced with our update cannot clobber these new values.
1569 * Note that you are still responsible for ensuring that other
1570 * operations which change the attribute on the server do not
1573 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1575 fattr->gencount = nfs_inc_attr_generation_counter();
1578 struct nfs_fattr *nfs_alloc_fattr(void)
1580 struct nfs_fattr *fattr;
1582 fattr = kmalloc(sizeof(*fattr), GFP_KERNEL);
1583 if (fattr != NULL) {
1584 nfs_fattr_init(fattr);
1585 fattr->label = NULL;
1589 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1591 struct nfs_fattr *nfs_alloc_fattr_with_label(struct nfs_server *server)
1593 struct nfs_fattr *fattr = nfs_alloc_fattr();
1598 fattr->label = nfs4_label_alloc(server, GFP_KERNEL);
1599 if (IS_ERR(fattr->label)) {
1606 EXPORT_SYMBOL_GPL(nfs_alloc_fattr_with_label);
1608 struct nfs_fh *nfs_alloc_fhandle(void)
1612 fh = kmalloc(sizeof(struct nfs_fh), GFP_KERNEL);
1617 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1621 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1622 * in the same way that wireshark does
1626 * For debugging only.
1628 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1630 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1631 * not on the result */
1632 return nfs_fhandle_hash(fh);
1634 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1637 * _nfs_display_fhandle - display an NFS file handle on the console
1639 * @fh: file handle to display
1640 * @caption: display caption
1642 * For debugging only.
1644 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1648 if (fh == NULL || fh->size == 0) {
1649 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1653 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1654 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1655 for (i = 0; i < fh->size; i += 16) {
1656 __be32 *pos = (__be32 *)&fh->data[i];
1658 switch ((fh->size - i - 1) >> 2) {
1660 printk(KERN_DEFAULT " %08x\n",
1664 printk(KERN_DEFAULT " %08x %08x\n",
1665 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1668 printk(KERN_DEFAULT " %08x %08x %08x\n",
1669 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1670 be32_to_cpup(pos + 2));
1673 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1674 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1675 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1679 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1683 * nfs_inode_attrs_cmp_generic - compare attributes
1684 * @fattr: attributes
1685 * @inode: pointer to inode
1687 * Attempt to divine whether or not an RPC call reply carrying stale
1688 * attributes got scheduled after another call carrying updated ones.
1689 * Note also the check for wraparound of 'attr_gencount'
1691 * The function returns '1' if it thinks the attributes in @fattr are
1692 * more recent than the ones cached in @inode. Otherwise it returns
1695 static int nfs_inode_attrs_cmp_generic(const struct nfs_fattr *fattr,
1696 const struct inode *inode)
1698 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1700 return (long)(fattr->gencount - attr_gencount) > 0 ||
1701 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1705 * nfs_inode_attrs_cmp_monotonic - compare attributes
1706 * @fattr: attributes
1707 * @inode: pointer to inode
1709 * Attempt to divine whether or not an RPC call reply carrying stale
1710 * attributes got scheduled after another call carrying updated ones.
1712 * We assume that the server observes monotonic semantics for
1713 * the change attribute, so a larger value means that the attributes in
1714 * @fattr are more recent, in which case the function returns the
1716 * A return value of '0' indicates no measurable change
1717 * A return value of '-1' means that the attributes in @inode are
1720 static int nfs_inode_attrs_cmp_monotonic(const struct nfs_fattr *fattr,
1721 const struct inode *inode)
1723 s64 diff = fattr->change_attr - inode_peek_iversion_raw(inode);
1726 return diff == 0 ? 0 : -1;
1730 * nfs_inode_attrs_cmp_strict_monotonic - compare attributes
1731 * @fattr: attributes
1732 * @inode: pointer to inode
1734 * Attempt to divine whether or not an RPC call reply carrying stale
1735 * attributes got scheduled after another call carrying updated ones.
1737 * We assume that the server observes strictly monotonic semantics for
1738 * the change attribute, so a larger value means that the attributes in
1739 * @fattr are more recent, in which case the function returns the
1741 * A return value of '-1' means that the attributes in @inode are
1742 * more recent or unchanged.
1744 static int nfs_inode_attrs_cmp_strict_monotonic(const struct nfs_fattr *fattr,
1745 const struct inode *inode)
1747 return nfs_inode_attrs_cmp_monotonic(fattr, inode) > 0 ? 1 : -1;
1751 * nfs_inode_attrs_cmp - compare attributes
1752 * @fattr: attributes
1753 * @inode: pointer to inode
1755 * This function returns '1' if it thinks the attributes in @fattr are
1756 * more recent than the ones cached in @inode. It returns '-1' if
1757 * the attributes in @inode are more recent than the ones in @fattr,
1758 * and it returns 0 if not sure.
1760 static int nfs_inode_attrs_cmp(const struct nfs_fattr *fattr,
1761 const struct inode *inode)
1763 if (nfs_inode_attrs_cmp_generic(fattr, inode) > 0)
1765 switch (NFS_SERVER(inode)->change_attr_type) {
1766 case NFS4_CHANGE_TYPE_IS_UNDEFINED:
1768 case NFS4_CHANGE_TYPE_IS_TIME_METADATA:
1769 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1771 return nfs_inode_attrs_cmp_monotonic(fattr, inode);
1773 if (!(fattr->valid & NFS_ATTR_FATTR_CHANGE))
1775 return nfs_inode_attrs_cmp_strict_monotonic(fattr, inode);
1781 * nfs_inode_finish_partial_attr_update - complete a previous inode update
1782 * @fattr: attributes
1783 * @inode: pointer to inode
1785 * Returns '1' if the last attribute update left the inode cached
1786 * attributes in a partially unrevalidated state, and @fattr
1787 * matches the change attribute of that partial update.
1788 * Otherwise returns '0'.
1790 static int nfs_inode_finish_partial_attr_update(const struct nfs_fattr *fattr,
1791 const struct inode *inode)
1793 const unsigned long check_valid =
1794 NFS_INO_INVALID_ATIME | NFS_INO_INVALID_CTIME |
1795 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1796 NFS_INO_INVALID_BLOCKS | NFS_INO_INVALID_OTHER |
1797 NFS_INO_INVALID_NLINK;
1798 unsigned long cache_validity = NFS_I(inode)->cache_validity;
1799 enum nfs4_change_attr_type ctype = NFS_SERVER(inode)->change_attr_type;
1801 if (ctype != NFS4_CHANGE_TYPE_IS_UNDEFINED &&
1802 !(cache_validity & NFS_INO_INVALID_CHANGE) &&
1803 (cache_validity & check_valid) != 0 &&
1804 (fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1805 nfs_inode_attrs_cmp_monotonic(fattr, inode) == 0)
1810 static int nfs_refresh_inode_locked(struct inode *inode,
1811 struct nfs_fattr *fattr)
1813 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1816 trace_nfs_refresh_inode_enter(inode);
1818 if (attr_cmp > 0 || nfs_inode_finish_partial_attr_update(fattr, inode))
1819 ret = nfs_update_inode(inode, fattr);
1820 else if (attr_cmp == 0)
1821 ret = nfs_check_inode_attributes(inode, fattr);
1823 trace_nfs_refresh_inode_exit(inode, ret);
1828 * nfs_refresh_inode - try to update the inode attribute cache
1829 * @inode: pointer to inode
1830 * @fattr: updated attributes
1832 * Check that an RPC call that returned attributes has not overlapped with
1833 * other recent updates of the inode metadata, then decide whether it is
1834 * safe to do a full update of the inode attributes, or whether just to
1835 * call nfs_check_inode_attributes.
1837 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1841 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1843 spin_lock(&inode->i_lock);
1844 status = nfs_refresh_inode_locked(inode, fattr);
1845 spin_unlock(&inode->i_lock);
1849 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1851 static int nfs_post_op_update_inode_locked(struct inode *inode,
1852 struct nfs_fattr *fattr, unsigned int invalid)
1854 if (S_ISDIR(inode->i_mode))
1855 invalid |= NFS_INO_INVALID_DATA;
1856 nfs_set_cache_invalid(inode, invalid);
1857 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1859 return nfs_refresh_inode_locked(inode, fattr);
1863 * nfs_post_op_update_inode - try to update the inode attribute cache
1864 * @inode: pointer to inode
1865 * @fattr: updated attributes
1867 * After an operation that has changed the inode metadata, mark the
1868 * attribute cache as being invalid, then try to update it.
1870 * NB: if the server didn't return any post op attributes, this
1871 * function will force the retrieval of attributes before the next
1872 * NFS request. Thus it should be used only for operations that
1873 * are expected to change one or more attributes, to avoid
1874 * unnecessary NFS requests and trips through nfs_update_inode().
1876 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1880 spin_lock(&inode->i_lock);
1881 nfs_fattr_set_barrier(fattr);
1882 status = nfs_post_op_update_inode_locked(inode, fattr,
1883 NFS_INO_INVALID_CHANGE
1884 | NFS_INO_INVALID_CTIME
1885 | NFS_INO_REVAL_FORCED);
1886 spin_unlock(&inode->i_lock);
1890 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1893 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1894 * @inode: pointer to inode
1895 * @fattr: updated attributes
1897 * After an operation that has changed the inode metadata, mark the
1898 * attribute cache as being invalid, then try to update it. Fake up
1899 * weak cache consistency data, if none exist.
1901 * This function is mainly designed to be used by the ->write_done() functions.
1903 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1905 int attr_cmp = nfs_inode_attrs_cmp(fattr, inode);
1908 /* Don't do a WCC update if these attributes are already stale */
1911 if ((fattr->valid & NFS_ATTR_FATTR) == 0 || !attr_cmp) {
1912 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1913 | NFS_ATTR_FATTR_PRESIZE
1914 | NFS_ATTR_FATTR_PREMTIME
1915 | NFS_ATTR_FATTR_PRECTIME);
1918 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1919 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1920 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1921 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1923 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1924 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1925 fattr->pre_ctime = inode->i_ctime;
1926 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1928 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1929 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1930 fattr->pre_mtime = inode->i_mtime;
1931 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1933 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1934 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1935 fattr->pre_size = i_size_read(inode);
1936 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1939 status = nfs_post_op_update_inode_locked(inode, fattr,
1940 NFS_INO_INVALID_CHANGE
1941 | NFS_INO_INVALID_CTIME
1942 | NFS_INO_INVALID_MTIME
1943 | NFS_INO_INVALID_BLOCKS);
1948 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1949 * @inode: pointer to inode
1950 * @fattr: updated attributes
1952 * After an operation that has changed the inode metadata, mark the
1953 * attribute cache as being invalid, then try to update it. Fake up
1954 * weak cache consistency data, if none exist.
1956 * This function is mainly designed to be used by the ->write_done() functions.
1958 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1962 spin_lock(&inode->i_lock);
1963 nfs_fattr_set_barrier(fattr);
1964 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1965 spin_unlock(&inode->i_lock);
1968 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1972 * Many nfs protocol calls return the new file attributes after
1973 * an operation. Here we update the inode to reflect the state
1974 * of the server's inode.
1976 * This is a bit tricky because we have to make sure all dirty pages
1977 * have been sent off to the server before calling invalidate_inode_pages.
1978 * To make sure no other process adds more write requests while we try
1979 * our best to flush them, we make them sleep during the attribute refresh.
1981 * A very similar scenario holds for the dir cache.
1983 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1985 struct nfs_server *server = NFS_SERVER(inode);
1986 struct nfs_inode *nfsi = NFS_I(inode);
1987 loff_t cur_isize, new_isize;
1988 u64 fattr_supported = server->fattr_valid;
1989 unsigned long invalid = 0;
1990 unsigned long now = jiffies;
1991 unsigned long save_cache_validity;
1992 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1993 bool cache_revalidated = true;
1994 bool attr_changed = false;
1995 bool have_delegation;
1997 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1998 __func__, inode->i_sb->s_id, inode->i_ino,
1999 nfs_display_fhandle_hash(NFS_FH(inode)),
2000 atomic_read(&inode->i_count), fattr->valid);
2002 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
2003 /* Only a mounted-on-fileid? Just exit */
2004 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
2006 /* Has the inode gone and changed behind our back? */
2007 } else if (nfsi->fileid != fattr->fileid) {
2008 /* Is this perhaps the mounted-on fileid? */
2009 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
2010 nfsi->fileid == fattr->mounted_on_fileid)
2012 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
2013 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
2014 NFS_SERVER(inode)->nfs_client->cl_hostname,
2015 inode->i_sb->s_id, (long long)nfsi->fileid,
2016 (long long)fattr->fileid);
2021 * Make sure the inode's type hasn't changed.
2023 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
2025 * Big trouble! The inode has become a different object.
2027 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
2028 __func__, inode->i_ino, inode->i_mode, fattr->mode);
2032 /* Update the fsid? */
2033 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
2034 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
2035 !IS_AUTOMOUNT(inode))
2036 server->fsid = fattr->fsid;
2038 /* Save the delegation state before clearing cache_validity */
2039 have_delegation = nfs_have_delegated_attributes(inode);
2042 * Update the read time so we don't revalidate too often.
2044 nfsi->read_cache_jiffies = fattr->time_start;
2046 save_cache_validity = nfsi->cache_validity;
2047 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
2048 | NFS_INO_INVALID_ATIME
2049 | NFS_INO_REVAL_FORCED
2050 | NFS_INO_INVALID_BLOCKS);
2052 /* Do atomic weak cache consistency updates */
2053 nfs_wcc_update_inode(inode, fattr);
2055 if (pnfs_layoutcommit_outstanding(inode)) {
2056 nfsi->cache_validity |=
2057 save_cache_validity &
2058 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
2059 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
2060 NFS_INO_INVALID_BLOCKS);
2061 cache_revalidated = false;
2064 /* More cache consistency checks */
2065 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
2066 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
2067 /* Could it be a race with writeback? */
2068 if (!(have_writers || have_delegation)) {
2069 invalid |= NFS_INO_INVALID_DATA
2070 | NFS_INO_INVALID_ACCESS
2071 | NFS_INO_INVALID_ACL
2072 | NFS_INO_INVALID_XATTR;
2073 /* Force revalidate of all attributes */
2074 save_cache_validity |= NFS_INO_INVALID_CTIME
2075 | NFS_INO_INVALID_MTIME
2076 | NFS_INO_INVALID_SIZE
2077 | NFS_INO_INVALID_BLOCKS
2078 | NFS_INO_INVALID_NLINK
2079 | NFS_INO_INVALID_MODE
2080 | NFS_INO_INVALID_OTHER;
2081 if (S_ISDIR(inode->i_mode))
2082 nfs_force_lookup_revalidate(inode);
2083 attr_changed = true;
2084 dprintk("NFS: change_attr change on server for file %s/%ld\n",
2087 } else if (!have_delegation)
2088 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
2089 inode_set_iversion_raw(inode, fattr->change_attr);
2092 nfsi->cache_validity |=
2093 save_cache_validity & NFS_INO_INVALID_CHANGE;
2094 if (!have_delegation ||
2095 (nfsi->cache_validity & NFS_INO_INVALID_CHANGE) != 0)
2096 cache_revalidated = false;
2099 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
2100 inode->i_mtime = fattr->mtime;
2101 else if (fattr_supported & NFS_ATTR_FATTR_MTIME)
2102 nfsi->cache_validity |=
2103 save_cache_validity & NFS_INO_INVALID_MTIME;
2105 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
2106 inode->i_ctime = fattr->ctime;
2107 else if (fattr_supported & NFS_ATTR_FATTR_CTIME)
2108 nfsi->cache_validity |=
2109 save_cache_validity & NFS_INO_INVALID_CTIME;
2111 /* Check if our cached file size is stale */
2112 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
2113 new_isize = nfs_size_to_loff_t(fattr->size);
2114 cur_isize = i_size_read(inode);
2115 if (new_isize != cur_isize && !have_delegation) {
2116 /* Do we perhaps have any outstanding writes, or has
2117 * the file grown beyond our last write? */
2118 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
2119 trace_nfs_size_update(inode, new_isize);
2120 i_size_write(inode, new_isize);
2122 invalid |= NFS_INO_INVALID_DATA;
2125 if (new_isize == 0 &&
2126 !(fattr->valid & (NFS_ATTR_FATTR_SPACE_USED |
2127 NFS_ATTR_FATTR_BLOCKS_USED))) {
2128 fattr->du.nfs3.used = 0;
2129 fattr->valid |= NFS_ATTR_FATTR_SPACE_USED;
2132 nfsi->cache_validity |=
2133 save_cache_validity & NFS_INO_INVALID_SIZE;
2135 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
2136 inode->i_atime = fattr->atime;
2137 else if (fattr_supported & NFS_ATTR_FATTR_ATIME)
2138 nfsi->cache_validity |=
2139 save_cache_validity & NFS_INO_INVALID_ATIME;
2141 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2142 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2143 umode_t newmode = inode->i_mode & S_IFMT;
2144 newmode |= fattr->mode & S_IALLUGO;
2145 inode->i_mode = newmode;
2146 invalid |= NFS_INO_INVALID_ACCESS
2147 | NFS_INO_INVALID_ACL;
2149 } else if (fattr_supported & NFS_ATTR_FATTR_MODE)
2150 nfsi->cache_validity |=
2151 save_cache_validity & NFS_INO_INVALID_MODE;
2153 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2154 if (!uid_eq(inode->i_uid, fattr->uid)) {
2155 invalid |= NFS_INO_INVALID_ACCESS
2156 | NFS_INO_INVALID_ACL;
2157 inode->i_uid = fattr->uid;
2159 } else if (fattr_supported & NFS_ATTR_FATTR_OWNER)
2160 nfsi->cache_validity |=
2161 save_cache_validity & NFS_INO_INVALID_OTHER;
2163 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2164 if (!gid_eq(inode->i_gid, fattr->gid)) {
2165 invalid |= NFS_INO_INVALID_ACCESS
2166 | NFS_INO_INVALID_ACL;
2167 inode->i_gid = fattr->gid;
2169 } else if (fattr_supported & NFS_ATTR_FATTR_GROUP)
2170 nfsi->cache_validity |=
2171 save_cache_validity & NFS_INO_INVALID_OTHER;
2173 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2174 if (inode->i_nlink != fattr->nlink)
2175 set_nlink(inode, fattr->nlink);
2176 } else if (fattr_supported & NFS_ATTR_FATTR_NLINK)
2177 nfsi->cache_validity |=
2178 save_cache_validity & NFS_INO_INVALID_NLINK;
2180 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2182 * report the blocks in 512byte units
2184 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2185 } else if (fattr_supported & NFS_ATTR_FATTR_SPACE_USED)
2186 nfsi->cache_validity |=
2187 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2189 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2190 inode->i_blocks = fattr->du.nfs2.blocks;
2191 else if (fattr_supported & NFS_ATTR_FATTR_BLOCKS_USED)
2192 nfsi->cache_validity |=
2193 save_cache_validity & NFS_INO_INVALID_BLOCKS;
2195 /* Update attrtimeo value if we're out of the unstable period */
2197 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2198 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2199 nfsi->attrtimeo_timestamp = now;
2200 /* Set barrier to be more recent than all outstanding updates */
2201 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2203 if (cache_revalidated) {
2204 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2205 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2206 nfsi->attrtimeo <<= 1;
2207 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2208 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2210 nfsi->attrtimeo_timestamp = now;
2212 /* Set the barrier to be more recent than this fattr */
2213 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2214 nfsi->attr_gencount = fattr->gencount;
2217 /* Don't invalidate the data if we were to blame */
2218 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2219 || S_ISLNK(inode->i_mode)))
2220 invalid &= ~NFS_INO_INVALID_DATA;
2221 nfs_set_cache_invalid(inode, invalid);
2226 * No need to worry about unhashing the dentry, as the
2227 * lookup validation will know that the inode is bad.
2228 * (But we fall through to invalidate the caches.)
2230 nfs_set_inode_stale_locked(inode);
2234 struct inode *nfs_alloc_inode(struct super_block *sb)
2236 struct nfs_inode *nfsi;
2237 nfsi = alloc_inode_sb(sb, nfs_inode_cachep, GFP_KERNEL);
2241 nfsi->cache_validity = 0UL;
2242 #if IS_ENABLED(CONFIG_NFS_V4)
2243 nfsi->nfs4_acl = NULL;
2244 #endif /* CONFIG_NFS_V4 */
2245 #ifdef CONFIG_NFS_V4_2
2246 nfsi->xattr_cache = NULL;
2248 return &nfsi->vfs_inode;
2250 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2252 void nfs_free_inode(struct inode *inode)
2254 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2256 EXPORT_SYMBOL_GPL(nfs_free_inode);
2258 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2260 #if IS_ENABLED(CONFIG_NFS_V4)
2261 INIT_LIST_HEAD(&nfsi->open_states);
2262 nfsi->delegation = NULL;
2263 init_rwsem(&nfsi->rwsem);
2264 nfsi->layout = NULL;
2268 static void init_once(void *foo)
2270 struct nfs_inode *nfsi = foo;
2272 inode_init_once(&nfsi->vfs_inode);
2273 INIT_LIST_HEAD(&nfsi->open_files);
2274 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2275 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2276 nfs4_init_once(nfsi);
2279 static int __init nfs_init_inodecache(void)
2281 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2282 sizeof(struct nfs_inode),
2283 0, (SLAB_RECLAIM_ACCOUNT|
2284 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2286 if (nfs_inode_cachep == NULL)
2292 static void nfs_destroy_inodecache(void)
2295 * Make sure all delayed rcu free inodes are flushed before we
2299 kmem_cache_destroy(nfs_inode_cachep);
2302 struct workqueue_struct *nfsiod_workqueue;
2303 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2306 * start up the nfsiod workqueue
2308 static int nfsiod_start(void)
2310 struct workqueue_struct *wq;
2311 dprintk("RPC: creating workqueue nfsiod\n");
2312 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2315 nfsiod_workqueue = wq;
2320 * Destroy the nfsiod workqueue
2322 static void nfsiod_stop(void)
2324 struct workqueue_struct *wq;
2326 wq = nfsiod_workqueue;
2329 nfsiod_workqueue = NULL;
2330 destroy_workqueue(wq);
2333 unsigned int nfs_net_id;
2334 EXPORT_SYMBOL_GPL(nfs_net_id);
2336 static int nfs_net_init(struct net *net)
2338 nfs_clients_init(net);
2339 return nfs_fs_proc_net_init(net);
2342 static void nfs_net_exit(struct net *net)
2344 nfs_fs_proc_net_exit(net);
2345 nfs_clients_exit(net);
2348 static struct pernet_operations nfs_net_ops = {
2349 .init = nfs_net_init,
2350 .exit = nfs_net_exit,
2352 .size = sizeof(struct nfs_net),
2358 static int __init init_nfs_fs(void)
2362 err = nfs_sysfs_init();
2366 err = register_pernet_subsys(&nfs_net_ops);
2370 err = nfsiod_start();
2374 err = nfs_fs_proc_init();
2378 err = nfs_init_nfspagecache();
2382 err = nfs_init_inodecache();
2386 err = nfs_init_readpagecache();
2390 err = nfs_init_writepagecache();
2394 err = nfs_init_directcache();
2398 rpc_proc_register(&init_net, &nfs_rpcstat);
2400 err = register_nfs_fs();
2406 rpc_proc_unregister(&init_net, "nfs");
2407 nfs_destroy_directcache();
2409 nfs_destroy_writepagecache();
2411 nfs_destroy_readpagecache();
2413 nfs_destroy_inodecache();
2415 nfs_destroy_nfspagecache();
2421 unregister_pernet_subsys(&nfs_net_ops);
2428 static void __exit exit_nfs_fs(void)
2430 nfs_destroy_directcache();
2431 nfs_destroy_writepagecache();
2432 nfs_destroy_readpagecache();
2433 nfs_destroy_inodecache();
2434 nfs_destroy_nfspagecache();
2435 unregister_pernet_subsys(&nfs_net_ops);
2436 rpc_proc_unregister(&init_net, "nfs");
2437 unregister_nfs_fs();
2443 /* Not quite true; I just maintain it */
2445 MODULE_LICENSE("GPL");
2446 module_param(enable_ino64, bool, 0644);
2448 module_init(init_nfs_fs)
2449 module_exit(exit_nfs_fs)