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Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowel...
[linux-2.6-block.git] / fs / nfs / inode.c
CommitLineData
09c434b8 1// SPDX-License-Identifier: GPL-2.0-only
1da177e4
LT		 2/*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
526719ba 9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
1da177e4
LT		 10 * experimental NFS changes. Modularisation taken straight from SYS5 fs.
11 *
12 * Change to nfs_read_super() to permit NFS mounts to multi-homed hosts.
13 * J.S.Peatfield@damtp.cam.ac.uk
14 *
15 */
16
1da177e4
LT		 17#include <linux/module.h>
18#include <linux/init.h>
174cd4b1 19#include <linux/sched/signal.h>
1da177e4
LT		 20#include <linux/time.h>
21#include <linux/kernel.h>
22#include <linux/mm.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>
4ece3a2d 29#include <linux/sunrpc/metrics.h>
1da177e4
LT		 30#include <linux/nfs_fs.h>
31#include <linux/nfs_mount.h>
32#include <linux/nfs4_mount.h>
33#include <linux/lockd/bind.h>
1da177e4
LT		 34#include <linux/seq_file.h>
35#include <linux/mount.h>
1da177e4 36#include <linux/vfs.h>
9cdb3883
MN		 37#include <linux/inet.h>
38#include <linux/nfs_xdr.h>
5a0e3ad6 39#include <linux/slab.h>
3fa0b4e2 40#include <linux/compat.h>
d310310c 41#include <linux/freezer.h>
7c0f6ba6 42#include <linux/uaccess.h>
1eb5d98f 43#include <linux/iversion.h>
1da177e4 44
4ce79717 45#include "nfs4_fs.h"
a72b4422 46#include "callback.h"
1da177e4 47#include "delegation.h"
d9ef5a8c 48#include "iostat.h"
f7b422b1 49#include "internal.h"
8ec442ae 50#include "fscache.h"
e5e94017 51#include "pnfs.h"
ab7017a3 52#include "nfs.h"
1b340d01 53#include "netns.h"
1da177e4 54
f4ce1299
TM		 55#include "nfstrace.h"
56
1da177e4 57#define NFSDBG_FACILITY NFSDBG_VFS
1da177e4 58
f43bf0be
TM		 59#define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
60
61/* Default is to see 64-bit inode numbers */
90ab5ee9 62static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
f43bf0be 63
1da177e4 64static void nfs_invalidate_inode(struct inode *);
24aa1fe6 65static int nfs_update_inode(struct inode *, struct nfs_fattr *);
1da177e4 66
e18b890b 67static struct kmem_cache * nfs_inode_cachep;
b7fa0554 68
1da177e4
LT		 69static inline unsigned long
70nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71{
72 return nfs_fileid_to_ino_t(fattr->fileid);
73}
74
210c7c17 75static int nfs_wait_killable(int mode)
72cb77f4 76{
416ad3c9 77 freezable_schedule_unsafe();
dfd01f02
PZ		 78 if (signal_pending_state(mode, current))
79 return -ERESTARTSYS;
72cb77f4
TM		 80 return 0;
81}
210c7c17
BC		 82
83int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84{
85 return nfs_wait_killable(mode);
86}
89d77c8f 87EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
72cb77f4 88
f43bf0be
TM		 89/**
90 * nfs_compat_user_ino64 - returns the user-visible inode number
91 * @fileid: 64-bit fileid
92 *
93 * This function returns a 32-bit inode number if the boot parameter
94 * nfs.enable_ino64 is zero.
95 */
96u64 nfs_compat_user_ino64(u64 fileid)
97{
3fa0b4e2
FF		 98#ifdef CONFIG_COMPAT
99 compat_ulong_t ino;
100#else
101 unsigned long ino;
102#endif
f43bf0be
TM		 103
104 if (enable_ino64)
105 return fileid;
106 ino = fileid;
107 if (sizeof(ino) < sizeof(fileid))
108 ino ^= fileid >> (sizeof(fileid)-sizeof(ino)) * 8;
109 return ino;
110}
111
eed99357
TM		 112int nfs_drop_inode(struct inode *inode)
113{
114 return NFS_STALE(inode) || generic_drop_inode(inode);
115}
116EXPORT_SYMBOL_GPL(nfs_drop_inode);
117
19d87ca3 118void nfs_clear_inode(struct inode *inode)
1da177e4 119{
da6d503a
TM		 120 /*
121 * The following should never happen...
122 */
f48407dd
TM		 123 WARN_ON_ONCE(nfs_have_writebacks(inode));
124 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
ada70d94 125 nfs_zap_acl_cache(inode);
1c3c07e9 126 nfs_access_zap_cache(inode);
f1fe29b4 127 nfs_fscache_clear_inode(inode);
1da177e4 128}
89d77c8f 129EXPORT_SYMBOL_GPL(nfs_clear_inode);
1da177e4 130
b57922d9
AV		 131void nfs_evict_inode(struct inode *inode)
132{
91b0abe3 133 truncate_inode_pages_final(&inode->i_data);
dbd5768f 134 clear_inode(inode);
b57922d9
AV		 135 nfs_clear_inode(inode);
136}
137
9e1681c2 138int nfs_sync_inode(struct inode *inode)
4d346bea 139{
95d9f6c3 140 inode_dio_wait(inode);
4d346bea
TM		 141 return nfs_wb_all(inode);
142}
9e1681c2 143EXPORT_SYMBOL_GPL(nfs_sync_inode);
4d346bea 144
29884df0
TM		 145/**
146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
302fad7b 147 * @mapping: pointer to struct address_space
29884df0
TM		 148 */
149int nfs_sync_mapping(struct address_space *mapping)
150{
5cf95214 151 int ret = 0;
29884df0 152
5cf95214
TM		 153 if (mapping->nrpages != 0) {
154 unmap_mapping_range(mapping, 0, 0, 0);
155 ret = nfs_wb_all(mapping->host);
156 }
29884df0
TM		 157 return ret;
158}
159
187e593d
TM		 160static int nfs_attribute_timeout(struct inode *inode)
161{
162 struct nfs_inode *nfsi = NFS_I(inode);
163
164 return !time_in_range_open(jiffies, nfsi->read_cache_jiffies, nfsi->read_cache_jiffies + nfsi->attrtimeo);
165}
166
61540bf6
TM		 167static bool nfs_check_cache_invalid_delegated(struct inode *inode, unsigned long flags)
168{
169 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
170
171 /* Special case for the pagecache or access cache */
172 if (flags == NFS_INO_REVAL_PAGECACHE &&
173 !(cache_validity & NFS_INO_REVAL_FORCED))
174 return false;
175 return (cache_validity & flags) != 0;
176}
177
178static bool nfs_check_cache_invalid_not_delegated(struct inode *inode, unsigned long flags)
179{
180 unsigned long cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
181
182 if ((cache_validity & flags) != 0)
183 return true;
184 if (nfs_attribute_timeout(inode))
185 return true;
186 return false;
187}
188
189bool nfs_check_cache_invalid(struct inode *inode, unsigned long flags)
190{
191 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
192 return nfs_check_cache_invalid_delegated(inode, flags);
193
194 return nfs_check_cache_invalid_not_delegated(inode, flags);
195}
196
6edf9609
TM		 197static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
198{
199 struct nfs_inode *nfsi = NFS_I(inode);
3f0b3cf4
TM		 200 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
201
202 if (have_delegation) {
203 if (!(flags & NFS_INO_REVAL_FORCED))
204 flags &= ~NFS_INO_INVALID_OTHER;
205 flags &= ~(NFS_INO_INVALID_CHANGE
206 | NFS_INO_INVALID_SIZE
207 | NFS_INO_REVAL_PAGECACHE);
208 }
6edf9609
TM		 209
210 if (inode->i_mapping->nrpages == 0)
211 flags &= ~NFS_INO_INVALID_DATA;
212 nfsi->cache_validity |= flags;
213 if (flags & NFS_INO_INVALID_DATA)
214 nfs_fscache_invalidate(inode);
215}
216
1da177e4
LT		 217/*
218 * Invalidate the local caches
219 */
b37b03b7 220static void nfs_zap_caches_locked(struct inode *inode)
1da177e4
LT		 221{
222 struct nfs_inode *nfsi = NFS_I(inode);
223 int mode = inode->i_mode;
224
91d5b470
CL		 225 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
226
c7c20973
TM		 227 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
228 nfsi->attrtimeo_timestamp = jiffies;
1da177e4 229
c3f52af3 230 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
de242c0b 231 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
6edf9609 232 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 233 | NFS_INO_INVALID_DATA
234 | NFS_INO_INVALID_ACCESS
235 | NFS_INO_INVALID_ACL
6edf9609 236 | NFS_INO_REVAL_PAGECACHE);
aa9c2669 237 } else
6edf9609 238 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
aa9c2669
DQ		 239 | NFS_INO_INVALID_ACCESS
240 | NFS_INO_INVALID_ACL
6edf9609 241 | NFS_INO_REVAL_PAGECACHE);
fd1defc2 242 nfs_zap_label_cache_locked(nfsi);
b37b03b7 243}
dc59250c 244
b37b03b7
TM		 245void nfs_zap_caches(struct inode *inode)
246{
247 spin_lock(&inode->i_lock);
248 nfs_zap_caches_locked(inode);
dc59250c 249 spin_unlock(&inode->i_lock);
ada70d94
TM		 250}
251
cd9ae2b6
TM		 252void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
253{
254 if (mapping->nrpages != 0) {
255 spin_lock(&inode->i_lock);
6edf9609 256 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
cd9ae2b6
TM		 257 spin_unlock(&inode->i_lock);
258 }
259}
260
f41f7418 261void nfs_zap_acl_cache(struct inode *inode)
ada70d94
TM		 262{
263 void (*clear_acl_cache)(struct inode *);
264
265 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
266 if (clear_acl_cache != NULL)
267 clear_acl_cache(inode);
dc59250c 268 spin_lock(&inode->i_lock);
55296809 269 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
dc59250c 270 spin_unlock(&inode->i_lock);
1da177e4 271}
1c606fb7 272EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
1da177e4 273
c4812998
TM		 274void nfs_invalidate_atime(struct inode *inode)
275{
276 spin_lock(&inode->i_lock);
6edf9609 277 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
c4812998
TM		 278 spin_unlock(&inode->i_lock);
279}
ddda8e0a 280EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
c4812998 281
1da177e4 282/*
b37b03b7
TM		 283 * Invalidate, but do not unhash, the inode.
284 * NB: must be called with inode->i_lock held!
1da177e4 285 */
b37b03b7 286static void nfs_invalidate_inode(struct inode *inode)
1da177e4 287{
3a10c30a 288 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
b37b03b7 289 nfs_zap_caches_locked(inode);
1da177e4
LT		 290}
291
292struct nfs_find_desc {
293 struct nfs_fh *fh;
294 struct nfs_fattr *fattr;
295};
296
297/*
298 * In NFSv3 we can have 64bit inode numbers. In order to support
299 * this, and re-exported directories (also seen in NFSv2)
300 * we are forced to allow 2 different inodes to have the same
301 * i_ino.
302 */
303static int
304nfs_find_actor(struct inode *inode, void *opaque)
305{
306 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
307 struct nfs_fh *fh = desc->fh;
308 struct nfs_fattr *fattr = desc->fattr;
309
310 if (NFS_FILEID(inode) != fattr->fileid)
311 return 0;
f6488c9b
JL		 312 if ((S_IFMT & inode->i_mode) != (S_IFMT & fattr->mode))
313 return 0;
1da177e4
LT		 314 if (nfs_compare_fh(NFS_FH(inode), fh))
315 return 0;
316 if (is_bad_inode(inode) || NFS_STALE(inode))
317 return 0;
318 return 1;
319}
320
321static int
322nfs_init_locked(struct inode *inode, void *opaque)
323{
324 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
325 struct nfs_fattr *fattr = desc->fattr;
326
99fadcd7 327 set_nfs_fileid(inode, fattr->fileid);
916ec34d 328 inode->i_mode = fattr->mode;
1da177e4
LT		 329 nfs_copy_fh(NFS_FH(inode), desc->fh);
330 return 0;
331}
332
e058f70b 333#ifdef CONFIG_NFS_V4_SECURITY_LABEL
fd1defc2
TM		 334static void nfs_clear_label_invalid(struct inode *inode)
335{
336 spin_lock(&inode->i_lock);
337 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
338 spin_unlock(&inode->i_lock);
339}
340
aa9c2669
DQ		 341void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
342 struct nfs4_label *label)
343{
344 int error;
345
346 if (label == NULL)
347 return;
348
aa9c2669
DQ		 349 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
350 error = security_inode_notifysecctx(inode, label->label,
351 label->len);
352 if (error)
353 printk(KERN_ERR "%s() %s %d "
354 "security_inode_notifysecctx() %d\n",
355 __func__,
356 (char *)label->label,
357 label->len, error);
fd1defc2 358 nfs_clear_label_invalid(inode);
aa9c2669
DQ		 359 }
360}
361
e058f70b
SD		 362struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
363{
364 struct nfs4_label *label = NULL;
365 int minor_version = server->nfs_client->cl_minorversion;
366
367 if (minor_version < 2)
368 return label;
369
370 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
371 return label;
372
373 label = kzalloc(sizeof(struct nfs4_label), flags);
374 if (label == NULL)
375 return ERR_PTR(-ENOMEM);
376
377 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
378 if (label->label == NULL) {
379 kfree(label);
380 return ERR_PTR(-ENOMEM);
381 }
382 label->len = NFS4_MAXLABELLEN;
383
384 return label;
385}
386EXPORT_SYMBOL_GPL(nfs4_label_alloc);
aa9c2669 387#else
829e57d7 388void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
aa9c2669
DQ		 389 struct nfs4_label *label)
390{
391}
e058f70b 392#endif
aa9c2669 393EXPORT_SYMBOL_GPL(nfs_setsecurity);
e058f70b 394
f174ff7a
PT		 395/* Search for inode identified by fh, fileid and i_mode in inode cache. */
396struct inode *
397nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
398{
399 struct nfs_find_desc desc = {
400 .fh = fh,
401 .fattr = fattr,
402 };
403 struct inode *inode;
404 unsigned long hash;
405
406 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
407 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
408 return NULL;
409
410 hash = nfs_fattr_to_ino_t(fattr);
411 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
412
413 dprintk("%s: returning %p\n", __func__, inode);
414 return inode;
415}
416
1da177e4
LT		 417/*
418 * This is our front-end to iget that looks up inodes by file handle
419 * instead of inode number.
420 */
421struct inode *
1775fd3e 422nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
1da177e4
LT		 423{
424 struct nfs_find_desc desc = {
425 .fh = fh,
426 .fattr = fattr
427 };
03f28e3a 428 struct inode *inode = ERR_PTR(-ENOENT);
1da177e4
LT		 429 unsigned long hash;
430
7ebb9315
BS		 431 nfs_attr_check_mountpoint(sb, fattr);
432
2ef47eb1
AS		 433 if (nfs_attr_use_mounted_on_fileid(fattr))
434 fattr->fileid = fattr->mounted_on_fileid;
435 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
1da177e4 436 goto out_no_inode;
9e6e70f8 437 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
1da177e4 438 goto out_no_inode;
1da177e4
LT		 439
440 hash = nfs_fattr_to_ino_t(fattr);
441
03f28e3a
TM		 442 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
443 if (inode == NULL) {
444 inode = ERR_PTR(-ENOMEM);
1da177e4 445 goto out_no_inode;
03f28e3a 446 }
1da177e4
LT		 447
448 if (inode->i_state & I_NEW) {
449 struct nfs_inode *nfsi = NFS_I(inode);
b0c4fddc 450 unsigned long now = jiffies;
1da177e4
LT		 451
452 /* We set i_ino for the few things that still rely on it,
453 * such as stat(2) */
454 inode->i_ino = hash;
455
456 /* We can't support update_atime(), since the server will reset it */
457 inode->i_flags |= S_NOATIME|S_NOCMTIME;
458 inode->i_mode = fattr->mode;
821a868a 459 nfsi->cache_validity = 0;
62ab460c
TM		 460 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
461 && nfs_server_capable(inode, NFS_CAP_MODE))
16e14375 462 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
1da177e4
LT		 463 /* Why so? Because we want revalidate for devices/FIFOs, and
464 * that's precisely what we have in nfs_file_inode_operations.
465 */
8fa5c000 466 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
1da177e4 467 if (S_ISREG(inode->i_mode)) {
1788ea6e 468 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
1da177e4 469 inode->i_data.a_ops = &nfs_file_aops;
1da177e4 470 } else if (S_ISDIR(inode->i_mode)) {
8fa5c000 471 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
1da177e4 472 inode->i_fop = &nfs_dir_operations;
11de3b11 473 inode->i_data.a_ops = &nfs_dir_aops;
55a97593 474 /* Deal with crossing mountpoints */
7ebb9315
BS		 475 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
476 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
6b97fd3d
MN		 477 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
478 inode->i_op = &nfs_referral_inode_operations;
479 else
480 inode->i_op = &nfs_mountpoint_inode_operations;
55a97593 481 inode->i_fop = NULL;
36d43a43 482 inode->i_flags |= S_AUTOMOUNT;
55a97593 483 }
21fc61c7 484 } else if (S_ISLNK(inode->i_mode)) {
1da177e4 485 inode->i_op = &nfs_symlink_inode_operations;
21fc61c7
AV		 486 inode_nohighmem(inode);
487 } else
1da177e4
LT		 488 init_special_inode(inode, inode->i_mode, fattr->rdev);
489
9e6e70f8
TM		 490 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
491 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
492 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
1eb5d98f 493 inode_set_iversion_raw(inode, 0);
9e6e70f8 494 inode->i_size = 0;
6d6b77f1 495 clear_nlink(inode);
9ff593c4
EB		 496 inode->i_uid = make_kuid(&init_user_ns, -2);
497 inode->i_gid = make_kgid(&init_user_ns, -2);
9e6e70f8
TM		 498 inode->i_blocks = 0;
499 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
2701d086
AA		 500 nfsi->write_io = 0;
501 nfsi->read_io = 0;
9e6e70f8 502
33801147 503 nfsi->read_cache_jiffies = fattr->time_start;
4704f0e2 504 nfsi->attr_gencount = fattr->gencount;
9e6e70f8 505 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
95582b00 506 inode->i_atime = timespec_to_timespec64(fattr->atime);
62ab460c 507 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
16e14375 508 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
9e6e70f8 509 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
95582b00 510 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
62ab460c 511 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
16e14375 512 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
9e6e70f8 513 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
95582b00 514 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
62ab460c 515 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
16e14375 516 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
9e6e70f8 517 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1eb5d98f 518 inode_set_iversion_raw(inode, fattr->change_attr);
cd812599 519 else
16e14375 520 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
9e6e70f8
TM		 521 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
522 inode->i_size = nfs_size_to_loff_t(fattr->size);
62ab460c 523 else
16e14375 524 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
9e6e70f8 525 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
bfe86848 526 set_nlink(inode, fattr->nlink);
62ab460c 527 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
16e14375 528 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 529 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
530 inode->i_uid = fattr->uid;
62ab460c 531 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
16e14375 532 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 533 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
534 inode->i_gid = fattr->gid;
62ab460c 535 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
16e14375 536 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
9e6e70f8
TM		 537 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
538 inode->i_blocks = fattr->du.nfs2.blocks;
539 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 540 /*
541 * report the blocks in 512byte units
542 */
543 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1da177e4 544 }
aa9c2669 545
821a868a
TM		 546 if (nfsi->cache_validity != 0)
547 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
548
aa9c2669
DQ		 549 nfs_setsecurity(inode, fattr, label);
550
1da177e4 551 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
b0c4fddc 552 nfsi->attrtimeo_timestamp = now;
1c3c07e9 553 nfsi->access_cache = RB_ROOT;
1da177e4 554
f1fe29b4 555 nfs_fscache_init_inode(inode);
ef79c097 556
1da177e4 557 unlock_new_inode(inode);
26fde4df
N		 558 } else {
559 int err = nfs_refresh_inode(inode, fattr);
560 if (err < 0) {
561 iput(inode);
562 inode = ERR_PTR(err);
563 goto out_no_inode;
564 }
565 }
1e8968c5 566 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
1da177e4 567 inode->i_sb->s_id,
1e8968c5 568 (unsigned long long)NFS_FILEID(inode),
4f1abd22 569 nfs_display_fhandle_hash(fh),
1da177e4
LT		 570 atomic_read(&inode->i_count));
571
572out:
573 return inode;
574
575out_no_inode:
03f28e3a 576 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
1da177e4
LT		 577 goto out;
578}
89d77c8f 579EXPORT_SYMBOL_GPL(nfs_fhget);
1da177e4 580
536e43d1 581#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)
1da177e4
LT		 582
583int
584nfs_setattr(struct dentry *dentry, struct iattr *attr)
585{
2b0143b5 586 struct inode *inode = d_inode(dentry);
987f8dfc 587 struct nfs_fattr *fattr;
ae57ca0f 588 int error = 0;
1da177e4 589
91d5b470
CL		 590 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
591
188b95dd
JL		 592 /* skip mode change if it's just for clearing setuid/setgid */
593 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
594 attr->ia_valid &= ~ATTR_MODE;
595
1da177e4 596 if (attr->ia_valid & ATTR_SIZE) {
08a899d5
CH		 597 BUG_ON(!S_ISREG(inode->i_mode));
598
ae57ca0f
KM		 599 error = inode_newsize_ok(inode, attr->ia_size);
600 if (error)
601 return error;
602
603 if (attr->ia_size == i_size_read(inode))
1da177e4
LT		 604 attr->ia_valid &= ~ATTR_SIZE;
605 }
606
607 /* Optimization: if the end result is no change, don't RPC */
608 attr->ia_valid &= NFS_VALID_ATTRS;
536e43d1 609 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
1da177e4
LT		 610 return 0;
611
f4ce1299
TM		 612 trace_nfs_setattr_enter(inode);
613
755c1e20 614 /* Write all dirty data */
4d346bea
TM		 615 if (S_ISREG(inode->i_mode))
616 nfs_sync_inode(inode);
987f8dfc
TM		 617
618 fattr = nfs_alloc_fattr();
ae57ca0f
KM		 619 if (fattr == NULL) {
620 error = -ENOMEM;
987f8dfc 621 goto out;
ae57ca0f
KM		 622 }
623
987f8dfc 624 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
65e4308d 625 if (error == 0)
aa9c2669 626 error = nfs_refresh_inode(inode, fattr);
987f8dfc
TM		 627 nfs_free_fattr(fattr);
628out:
f4ce1299 629 trace_nfs_setattr_exit(inode, error);
65e4308d
TM		 630 return error;
631}
ddda8e0a 632EXPORT_SYMBOL_GPL(nfs_setattr);
65e4308d 633
a3d01454
TM		 634/**
635 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
636 * @inode: inode of the file used
637 * @offset: file offset to start truncating
638 *
639 * This is a copy of the common vmtruncate, but with the locking
640 * corrected to take into account the fact that NFS requires
641 * inode->i_size to be updated under the inode->i_lock.
f044636d 642 * Note: must be called with inode->i_lock held!
a3d01454
TM		 643 */
644static int nfs_vmtruncate(struct inode * inode, loff_t offset)
645{
c08d3b0e 646 int err;
a3d01454 647
c08d3b0e 648 err = inode_newsize_ok(inode, offset);
649 if (err)
650 goto out;
a3d01454 651
c08d3b0e 652 i_size_write(inode, offset);
6edf9609
TM		 653 /* Optimisation */
654 if (offset == 0)
655 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_DATA;
f6cdfa6d 656 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
c08d3b0e 657
f044636d 658 spin_unlock(&inode->i_lock);
7caef267 659 truncate_pagecache(inode, offset);
f044636d 660 spin_lock(&inode->i_lock);
c08d3b0e 661out:
662 return err;
a3d01454
TM		 663}
664
65e4308d
TM		 665/**
666 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
667 * @inode: pointer to struct inode
668 * @attr: pointer to struct iattr
16e14375 669 * @fattr: pointer to struct nfs_fattr
65e4308d
TM		 670 *
671 * Note: we do this in the *proc.c in order to ensure that
672 * it works for things like exclusive creates too.
673 */
f044636d
TM		 674void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
675 struct nfs_fattr *fattr)
65e4308d 676{
f044636d
TM		 677 /* Barrier: bump the attribute generation count. */
678 nfs_fattr_set_barrier(fattr);
679
680 spin_lock(&inode->i_lock);
681 NFS_I(inode)->attr_gencount = fattr->gencount;
6a97d02d
TM		 682 if ((attr->ia_valid & ATTR_SIZE) != 0) {
683 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
684 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
685 nfs_vmtruncate(inode, attr->ia_size);
686 }
65e4308d 687 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
6a97d02d 688 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
1da177e4 689 if ((attr->ia_valid & ATTR_MODE) != 0) {
65e4308d
TM		 690 int mode = attr->ia_mode & S_IALLUGO;
691 mode |= inode->i_mode & ~S_IALLUGO;
1da177e4
LT		 692 inode->i_mode = mode;
693 }
694 if ((attr->ia_valid & ATTR_UID) != 0)
695 inode->i_uid = attr->ia_uid;
696 if ((attr->ia_valid & ATTR_GID) != 0)
697 inode->i_gid = attr->ia_gid;
6a97d02d 698 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
15eefe2a 699 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
6a97d02d
TM		 700 else
701 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
702 | NFS_INO_INVALID_CTIME);
6edf9609
TM		 703 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
704 | NFS_INO_INVALID_ACL);
65e4308d 705 }
6a97d02d
TM		 706 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
707 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
708 | NFS_INO_INVALID_CTIME);
709 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
15eefe2a 710 inode->i_atime = timespec_to_timespec64(fattr->atime);
6a97d02d
TM		 711 else if (attr->ia_valid & ATTR_ATIME_SET)
712 inode->i_atime = attr->ia_atime;
713 else
714 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
715
716 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
15eefe2a 717 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
6a97d02d
TM		 718 else
719 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
720 | NFS_INO_INVALID_CTIME);
721 }
722 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
723 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
724 | NFS_INO_INVALID_CTIME);
725 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
15eefe2a 726 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
6a97d02d
TM		 727 else if (attr->ia_valid & ATTR_MTIME_SET)
728 inode->i_mtime = attr->ia_mtime;
729 else
730 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
731
732 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
15eefe2a 733 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
6a97d02d
TM		 734 else
735 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
736 | NFS_INO_INVALID_CTIME);
65e4308d 737 }
616c3196
JL		 738 if (fattr->valid)
739 nfs_update_inode(inode, fattr);
f044636d 740 spin_unlock(&inode->i_lock);
1da177e4 741}
ddda8e0a 742EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
1da177e4 743
1bcf4c5c 744static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
311324ad
TM		 745{
746 struct dentry *parent;
747
1bcf4c5c
TM		 748 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
749 return;
311324ad 750 parent = dget_parent(dentry);
2b0143b5 751 nfs_force_use_readdirplus(d_inode(parent));
311324ad
TM		 752 dput(parent);
753}
754
1bcf4c5c
TM		 755static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
756{
757 struct dentry *parent;
758
759 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
760 return;
761 parent = dget_parent(dentry);
762 nfs_advise_use_readdirplus(d_inode(parent));
763 dput(parent);
764}
765
311324ad
TM		 766static bool nfs_need_revalidate_inode(struct inode *inode)
767{
768 if (NFS_I(inode)->cache_validity &
769 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
770 return true;
771 if (nfs_attribute_cache_expired(inode))
772 return true;
773 return false;
774}
775
a528d35e
DH		 776int nfs_getattr(const struct path *path, struct kstat *stat,
777 u32 request_mask, unsigned int query_flags)
1da177e4 778{
a528d35e 779 struct inode *inode = d_inode(path->dentry);
9ccee940
TM		 780 struct nfs_server *server = NFS_SERVER(inode);
781 unsigned long cache_validity;
16caf5b6 782 int err = 0;
9ccee940
TM		 783 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
784 bool do_update = false;
1da177e4 785
f4ce1299 786 trace_nfs_getattr_enter(inode);
9ccee940
TM		 787
788 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync)
789 goto out_no_update;
790
acdc53b2 791 /* Flush out writes to the server in order to update c/mtime. */
9ccee940
TM		 792 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
793 S_ISREG(inode->i_mode)) {
79566ef0 794 err = filemap_write_and_wait(inode->i_mapping);
acdc53b2
TM		 795 if (err)
796 goto out;
28c494c5 797 }
fc33a7bb
CH		 798
799 /*
800 * We may force a getattr if the user cares about atime.
801 *
802 * Note that we only have to check the vfsmount flags here:
803 * - NFS always sets S_NOATIME by so checking it would give a
804 * bogus result
1751e8a6 805 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
fc33a7bb
CH		 806 * no point in checking those.
807 */
a528d35e
DH		 808 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
809 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
9ccee940
TM		 810 request_mask &= ~STATX_ATIME;
811
812 /* Is the user requesting attributes that might need revalidation? */
813 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
814 STATX_MTIME|STATX_UID|STATX_GID|
815 STATX_SIZE|STATX_BLOCKS)))
816 goto out_no_revalidate;
817
818 /* Check whether the cached attributes are stale */
819 do_update |= force_sync || nfs_attribute_cache_expired(inode);
820 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
821 do_update |= cache_validity &
822 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
823 if (request_mask & STATX_ATIME)
824 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
825 if (request_mask & (STATX_CTIME|STATX_MTIME))
826 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
827 if (do_update) {
828 /* Update the attribute cache */
59b86d85
HT		 829 if (!(server->flags & NFS_MOUNT_NOAC))
830 nfs_readdirplus_parent_cache_miss(path->dentry);
831 else
832 nfs_readdirplus_parent_cache_hit(path->dentry);
311324ad 833 err = __nfs_revalidate_inode(server, inode);
9ccee940
TM		 834 if (err)
835 goto out;
1bcf4c5c 836 } else
a528d35e 837 nfs_readdirplus_parent_cache_hit(path->dentry);
9ccee940
TM		 838out_no_revalidate:
839 /* Only return attributes that were revalidated. */
840 stat->result_mask &= request_mask;
841out_no_update:
842 generic_fillattr(inode, stat);
843 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
844 if (S_ISDIR(inode->i_mode))
845 stat->blksize = NFS_SERVER(inode)->dtsize;
acdc53b2 846out:
f4ce1299 847 trace_nfs_getattr_exit(inode, err);
1da177e4
LT		 848 return err;
849}
ddda8e0a 850EXPORT_SYMBOL_GPL(nfs_getattr);
1da177e4 851
f11ac8db
TM		 852static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
853{
2f62b5aa 854 refcount_set(&l_ctx->count, 1);
d51fdb87 855 l_ctx->lockowner = current->files;
f11ac8db 856 INIT_LIST_HEAD(&l_ctx->list);
210c7c17 857 atomic_set(&l_ctx->io_count, 0);
f11ac8db
TM		 858}
859
860static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
861{
1db97eaa 862 struct nfs_lock_context *pos;
f11ac8db 863
1db97eaa 864 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
d51fdb87 865 if (pos->lockowner != current->files)
f11ac8db 866 continue;
1db97eaa
TM		 867 if (refcount_inc_not_zero(&pos->count))
868 return pos;
869 }
f11ac8db
TM		 870 return NULL;
871}
872
873struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
874{
875 struct nfs_lock_context *res, *new = NULL;
2b0143b5 876 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 877
1db97eaa 878 rcu_read_lock();
f11ac8db 879 res = __nfs_find_lock_context(ctx);
1db97eaa 880 rcu_read_unlock();
f11ac8db 881 if (res == NULL) {
f11ac8db
TM		 882 new = kmalloc(sizeof(*new), GFP_KERNEL);
883 if (new == NULL)
b3c54de6 884 return ERR_PTR(-ENOMEM);
f11ac8db
TM		 885 nfs_init_lock_context(new);
886 spin_lock(&inode->i_lock);
887 res = __nfs_find_lock_context(ctx);
888 if (res == NULL) {
15494511
TM		 889 new->open_context = get_nfs_open_context(ctx);
890 if (new->open_context) {
891 list_add_tail_rcu(&new->list,
892 &ctx->lock_context.list);
893 res = new;
894 new = NULL;
895 } else
896 res = ERR_PTR(-EBADF);
f11ac8db 897 }
1db97eaa
TM		 898 spin_unlock(&inode->i_lock);
899 kfree(new);
f11ac8db 900 }
f11ac8db
TM		 901 return res;
902}
1c6dcbe5 903EXPORT_SYMBOL_GPL(nfs_get_lock_context);
f11ac8db
TM		 904
905void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
906{
907 struct nfs_open_context *ctx = l_ctx->open_context;
2b0143b5 908 struct inode *inode = d_inode(ctx->dentry);
f11ac8db 909
2f62b5aa 910 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
f11ac8db 911 return;
1db97eaa 912 list_del_rcu(&l_ctx->list);
f11ac8db 913 spin_unlock(&inode->i_lock);
15494511 914 put_nfs_open_context(ctx);
1db97eaa 915 kfree_rcu(l_ctx, rcu_head);
f11ac8db 916}
1c6dcbe5 917EXPORT_SYMBOL_GPL(nfs_put_lock_context);
f11ac8db 918
7fe5c398
TM		 919/**
920 * nfs_close_context - Common close_context() routine NFSv2/v3
921 * @ctx: pointer to context
922 * @is_sync: is this a synchronous close
923 *
5cf9d706
TM		 924 * Ensure that the attributes are up to date if we're mounted
925 * with close-to-open semantics and we have cached data that will
926 * need to be revalidated on open.
7fe5c398
TM		 927 */
928void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
929{
5cf9d706 930 struct nfs_inode *nfsi;
7fe5c398
TM		 931 struct inode *inode;
932 struct nfs_server *server;
933
934 if (!(ctx->mode & FMODE_WRITE))
935 return;
936 if (!is_sync)
937 return;
2b0143b5 938 inode = d_inode(ctx->dentry);
58ff4184
TM		 939 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
940 return;
5cf9d706
TM		 941 nfsi = NFS_I(inode);
942 if (inode->i_mapping->nrpages == 0)
943 return;
944 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
945 return;
946 if (!list_empty(&nfsi->open_files))
7fe5c398
TM		 947 return;
948 server = NFS_SERVER(inode);
949 if (server->flags & NFS_MOUNT_NOCTO)
950 return;
951 nfs_revalidate_inode(server, inode);
952}
ddda8e0a 953EXPORT_SYMBOL_GPL(nfs_close_context);
7fe5c398 954
532d4def
N		 955struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
956 fmode_t f_mode,
957 struct file *filp)
1da177e4
LT		 958{
959 struct nfs_open_context *ctx;
a52458b4 960 const struct cred *cred = get_current_cred();
1da177e4 961
f52720ca 962 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
5ede7b1c 963 if (!ctx) {
a52458b4 964 put_cred(cred);
5ede7b1c 965 return ERR_PTR(-ENOMEM);
1da177e4 966 }
5ede7b1c
AV		 967 nfs_sb_active(dentry->d_sb);
968 ctx->dentry = dget(dentry);
969 ctx->cred = cred;
ddf529ee 970 ctx->ll_cred = NULL;
5ede7b1c
AV		 971 ctx->state = NULL;
972 ctx->mode = f_mode;
973 ctx->flags = 0;
974 ctx->error = 0;
532d4def 975 ctx->flock_owner = (fl_owner_t)filp;
5ede7b1c
AV		 976 nfs_init_lock_context(&ctx->lock_context);
977 ctx->lock_context.open_context = ctx;
978 INIT_LIST_HEAD(&ctx->list);
82be417a 979 ctx->mdsthreshold = NULL;
1da177e4
LT		 980 return ctx;
981}
89d77c8f 982EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1da177e4
LT		 983
984struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
985{
0de43976
TM		 986 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
987 return ctx;
988 return NULL;
1da177e4 989}
89d77c8f 990EXPORT_SYMBOL_GPL(get_nfs_open_context);
1da177e4 991
7fe5c398 992static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1da177e4 993{
2b0143b5 994 struct inode *inode = d_inode(ctx->dentry);
3d4ff43d 995 struct super_block *sb = ctx->dentry->d_sb;
3bec63db 996
0de43976
TM		 997 if (!refcount_dec_and_test(&ctx->lock_context.count))
998 return;
5c78f58e 999 if (!list_empty(&ctx->list)) {
0de43976
TM		 1000 spin_lock(&inode->i_lock);
1001 list_del_rcu(&ctx->list);
ef84303e 1002 spin_unlock(&inode->i_lock);
0de43976 1003 }
5c78f58e
TM		 1004 if (inode != NULL)
1005 NFS_PROTO(inode)->close_context(ctx, is_sync);
a52458b4 1006 put_cred(ctx->cred);
3d4ff43d 1007 dput(ctx->dentry);
322b2b90 1008 nfs_sb_deactive(sb);
ddf529ee 1009 put_rpccred(ctx->ll_cred);
82be417a 1010 kfree(ctx->mdsthreshold);
0de43976 1011 kfree_rcu(ctx, rcu_head);
3bec63db
TM		 1012}
1013
a49c3c77
TM		 1014void put_nfs_open_context(struct nfs_open_context *ctx)
1015{
1016 __put_nfs_open_context(ctx, 0);
1017}
89d77c8f 1018EXPORT_SYMBOL_GPL(put_nfs_open_context);
a49c3c77 1019
4eae5014
TM		 1020static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1021{
1022 __put_nfs_open_context(ctx, 1);
1023}
1024
1da177e4
LT		 1025/*
1026 * Ensure that mmap has a recent RPC credential for use when writing out
1027 * shared pages
1028 */
c45ffdd2 1029void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1da177e4 1030{
2b0143b5 1031 struct inode *inode = d_inode(ctx->dentry);
1da177e4
LT		 1032 struct nfs_inode *nfsi = NFS_I(inode);
1033
1da177e4 1034 spin_lock(&inode->i_lock);
0de43976 1035 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1da177e4
LT		 1036 spin_unlock(&inode->i_lock);
1037}
c45ffdd2
TM		 1038EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1039
1040void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1041{
1042 filp->private_data = get_nfs_open_context(ctx);
1043 if (list_empty(&ctx->list))
1044 nfs_inode_attach_open_context(ctx);
1045}
89d77c8f 1046EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1da177e4 1047
d530838b
TM		 1048/*
1049 * Given an inode, search for an open context with the desired characteristics
1050 */
a52458b4 1051struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1da177e4
LT		 1052{
1053 struct nfs_inode *nfsi = NFS_I(inode);
1054 struct nfs_open_context *pos, *ctx = NULL;
1055
0de43976
TM		 1056 rcu_read_lock();
1057 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
d530838b
TM		 1058 if (cred != NULL && pos->cred != cred)
1059 continue;
1544fa0f
TM		 1060 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1061 continue;
1062 ctx = get_nfs_open_context(pos);
0de43976
TM		 1063 if (ctx)
1064 break;
1da177e4 1065 }
0de43976 1066 rcu_read_unlock();
1da177e4
LT		 1067 return ctx;
1068}
1069
aff8d8dc 1070void nfs_file_clear_open_context(struct file *filp)
1da177e4 1071{
cd3758e3 1072 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1da177e4
LT		 1073
1074 if (ctx) {
2b0143b5 1075 struct inode *inode = d_inode(ctx->dentry);
c45ffdd2 1076
0bcbf039
PT		 1077 /*
1078 * We fatal error on write before. Try to writeback
1079 * every page again.
1080 */
1081 if (ctx->error < 0)
1082 invalidate_inode_pages2(inode->i_mapping);
1da177e4 1083 filp->private_data = NULL;
4eae5014 1084 put_nfs_open_context_sync(ctx);
1da177e4
LT		 1085 }
1086}
1087
1088/*
1089 * These allocate and release file read/write context information.
1090 */
1091int nfs_open(struct inode *inode, struct file *filp)
1092{
1093 struct nfs_open_context *ctx;
1da177e4 1094
532d4def 1095 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
5ede7b1c
AV		 1096 if (IS_ERR(ctx))
1097 return PTR_ERR(ctx);
1da177e4
LT		 1098 nfs_file_set_open_context(filp, ctx);
1099 put_nfs_open_context(ctx);
f1fe29b4 1100 nfs_fscache_open_file(inode, filp);
1da177e4
LT		 1101 return 0;
1102}
1103
1da177e4
LT		 1104/*
1105 * This function is called whenever some part of NFS notices that
1106 * the cached attributes have to be refreshed.
1107 */
1108int
1109__nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1110{
1111 int status = -ESTALE;
1775fd3e 1112 struct nfs4_label *label = NULL;
a3cba2aa 1113 struct nfs_fattr *fattr = NULL;
1da177e4 1114 struct nfs_inode *nfsi = NFS_I(inode);
1da177e4 1115
1e8968c5
NV		 1116 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1117 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1da177e4 1118
f4ce1299
TM		 1119 trace_nfs_revalidate_inode_enter(inode);
1120
85233a7a 1121 if (is_bad_inode(inode))
691beb13 1122 goto out;
1da177e4 1123 if (NFS_STALE(inode))
412d582e 1124 goto out;
7fdc49c4 1125
ac46bd37
TM		 1126 /* pNFS: Attributes aren't updated until we layoutcommit */
1127 if (S_ISREG(inode->i_mode)) {
1128 status = pnfs_sync_inode(inode, false);
1129 if (status)
1130 goto out;
1131 }
1132
a3cba2aa
TM		 1133 status = -ENOMEM;
1134 fattr = nfs_alloc_fattr();
1135 if (fattr == NULL)
1136 goto out;
1137
691beb13 1138 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
14c43f76
DQ		 1139
1140 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1141 if (IS_ERR(label)) {
1142 status = PTR_ERR(label);
1143 goto out;
1144 }
1145
a841b54d
TM		 1146 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1147 label, inode);
1da177e4 1148 if (status != 0) {
1e8968c5 1149 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1da177e4 1150 inode->i_sb->s_id,
1e8968c5 1151 (unsigned long long)NFS_FILEID(inode), status);
1da177e4
LT		 1152 if (status == -ESTALE) {
1153 nfs_zap_caches(inode);
1154 if (!S_ISDIR(inode->i_mode))
3a10c30a 1155 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
1da177e4 1156 }
14c43f76 1157 goto err_out;
1da177e4
LT		 1158 }
1159
a3cba2aa 1160 status = nfs_refresh_inode(inode, fattr);
1da177e4 1161 if (status) {
1e8968c5 1162 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1da177e4 1163 inode->i_sb->s_id,
1e8968c5 1164 (unsigned long long)NFS_FILEID(inode), status);
14c43f76 1165 goto err_out;
1da177e4 1166 }
55296809 1167
24aa1fe6 1168 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
ada70d94 1169 nfs_zap_acl_cache(inode);
55296809 1170
3da580aa
JL		 1171 nfs_setsecurity(inode, fattr, label);
1172
1e8968c5 1173 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1da177e4 1174 inode->i_sb->s_id,
1e8968c5 1175 (unsigned long long)NFS_FILEID(inode));
1da177e4 1176
14c43f76
DQ		 1177err_out:
1178 nfs4_label_free(label);
1179out:
a3cba2aa 1180 nfs_free_fattr(fattr);
f4ce1299 1181 trace_nfs_revalidate_inode_exit(inode, status);
1da177e4
LT		 1182 return status;
1183}
1184
43f291cd 1185int nfs_attribute_cache_expired(struct inode *inode)
d7cf8dd0 1186{
b4d2314b 1187 if (nfs_have_delegated_attributes(inode))
1da177e4 1188 return 0;
d7cf8dd0 1189 return nfs_attribute_timeout(inode);
1da177e4
LT		 1190}
1191
1192/**
1193 * nfs_revalidate_inode - Revalidate the inode attributes
302fad7b
TM		 1194 * @server: pointer to nfs_server struct
1195 * @inode: pointer to inode struct
1da177e4
LT		 1196 *
1197 * Updates inode attribute information by retrieving the data from the server.
1198 */
1199int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1200{
311324ad 1201 if (!nfs_need_revalidate_inode(inode))
1da177e4
LT		 1202 return NFS_STALE(inode) ? -ESTALE : 0;
1203 return __nfs_revalidate_inode(server, inode);
1204}
1c606fb7 1205EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1da177e4 1206
1cda707d 1207static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
717d44e8
TM		 1208{
1209 struct nfs_inode *nfsi = NFS_I(inode);
f8806c84
TM		 1210 int ret;
1211
717d44e8 1212 if (mapping->nrpages != 0) {
f8806c84
TM		 1213 if (S_ISREG(inode->i_mode)) {
1214 ret = nfs_sync_mapping(mapping);
1215 if (ret < 0)
1216 return ret;
1217 }
1218 ret = invalidate_inode_pages2(mapping);
717d44e8
TM		 1219 if (ret < 0)
1220 return ret;
1221 }
d529ef83
JL		 1222 if (S_ISDIR(inode->i_mode)) {
1223 spin_lock(&inode->i_lock);
717d44e8 1224 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
d529ef83
JL		 1225 spin_unlock(&inode->i_lock);
1226 }
717d44e8 1227 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
de242c0b 1228 nfs_fscache_wait_on_invalidate(inode);
f4ce1299 1229
1e8968c5
NV		 1230 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1231 inode->i_sb->s_id,
1232 (unsigned long long)NFS_FILEID(inode));
717d44e8
TM		 1233 return 0;
1234}
1235
1cd9cb05 1236bool nfs_mapping_need_revalidate_inode(struct inode *inode)
b4b1eadf 1237{
61540bf6
TM		 1238 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1239 NFS_STALE(inode);
b4b1eadf
TM		 1240}
1241
0d0def49
AV		 1242int nfs_revalidate_mapping_rcu(struct inode *inode)
1243{
1244 struct nfs_inode *nfsi = NFS_I(inode);
1245 unsigned long *bitlock = &nfsi->flags;
1246 int ret = 0;
1247
1248 if (IS_SWAPFILE(inode))
1249 goto out;
1250 if (nfs_mapping_need_revalidate_inode(inode)) {
1251 ret = -ECHILD;
1252 goto out;
1253 }
1254 spin_lock(&inode->i_lock);
1255 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1256 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1257 ret = -ECHILD;
1258 spin_unlock(&inode->i_lock);
1259out:
1260 return ret;
1261}
1262
717d44e8 1263/**
be527494 1264 * nfs_revalidate_mapping - Revalidate the pagecache
302fad7b
TM		 1265 * @inode: pointer to host inode
1266 * @mapping: pointer to mapping
717d44e8 1267 */
be527494
TM		 1268int nfs_revalidate_mapping(struct inode *inode,
1269 struct address_space *mapping)
717d44e8
TM		 1270{
1271 struct nfs_inode *nfsi = NFS_I(inode);
d529ef83 1272 unsigned long *bitlock = &nfsi->flags;
717d44e8 1273 int ret = 0;
dc59250c 1274
29418aa4
MG		 1275 /* swapfiles are not supposed to be shared. */
1276 if (IS_SWAPFILE(inode))
1277 goto out;
1278
b4b1eadf 1279 if (nfs_mapping_need_revalidate_inode(inode)) {
717d44e8
TM		 1280 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1281 if (ret < 0)
1282 goto out;
7d52e862 1283 }
d529ef83
JL		 1284
1285 /*
1286 * We must clear NFS_INO_INVALID_DATA first to ensure that
1287 * invalidations that come in while we're shooting down the mappings
1288 * are respected. But, that leaves a race window where one revalidator
1289 * can clear the flag, and then another checks it before the mapping
1290 * gets invalidated. Fix that by serializing access to this part of
1291 * the function.
1292 *
1293 * At the same time, we need to allow other tasks to see whether we
1294 * might be in the middle of invalidating the pages, so we only set
1295 * the bit lock here if it looks like we're going to be doing that.
1296 */
1297 for (;;) {
74316201
N		 1298 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1299 nfs_wait_bit_killable, TASK_KILLABLE);
d529ef83
JL		 1300 if (ret)
1301 goto out;
17dfeb91
TM		 1302 spin_lock(&inode->i_lock);
1303 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1304 spin_unlock(&inode->i_lock);
1305 continue;
1306 }
1307 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
d529ef83 1308 break;
d529ef83 1309 spin_unlock(&inode->i_lock);
17dfeb91 1310 goto out;
f4ce1299
TM		 1311 }
1312
17dfeb91 1313 set_bit(NFS_INO_INVALIDATING, bitlock);
4db72b40 1314 smp_wmb();
17dfeb91
TM		 1315 nfsi->cache_validity &= ~NFS_INO_INVALID_DATA;
1316 spin_unlock(&inode->i_lock);
1317 trace_nfs_invalidate_mapping_enter(inode);
be527494 1318 ret = nfs_invalidate_mapping(inode, mapping);
17dfeb91
TM		 1319 trace_nfs_invalidate_mapping_exit(inode, ret);
1320
d529ef83 1321 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
4e857c58 1322 smp_mb__after_atomic();
d529ef83 1323 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
cd9ae2b6 1324out:
44b11874 1325 return ret;
7d52e862
TM		 1326}
1327
ca0daa27 1328static bool nfs_file_has_writers(struct nfs_inode *nfsi)
874f9463 1329{
ca0daa27
TM		 1330 struct inode *inode = &nfsi->vfs_inode;
1331
ca0daa27
TM		 1332 if (!S_ISREG(inode->i_mode))
1333 return false;
1334 if (list_empty(&nfsi->open_files))
1335 return false;
6ba0c4e5 1336 return inode_is_open_for_write(inode);
874f9463
TM		 1337}
1338
651b0e70 1339static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
874f9463 1340{
651b0e70 1341 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
874f9463
TM		 1342}
1343
783b194c 1344static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
a895b4a1 1345{
95582b00
DD		 1346 struct timespec ts;
1347
9e6e70f8
TM		 1348 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1349 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
c472c07b 1350 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1eb5d98f 1351 inode_set_iversion_raw(inode, fattr->change_attr);
70ca8852 1352 if (S_ISDIR(inode->i_mode))
6edf9609 1353 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
70ca8852 1354 }
a895b4a1 1355 /* If we have atomic WCC data, we may update some attributes */
95582b00 1356 ts = timespec64_to_timespec(inode->i_ctime);
9e6e70f8
TM		 1357 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1358 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
95582b00
DD		 1359 && timespec_equal(&ts, &fattr->pre_ctime)) {
1360 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
27dc1cd3 1361 }
9e6e70f8 1362
95582b00 1363 ts = timespec64_to_timespec(inode->i_mtime);
9e6e70f8
TM		 1364 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1365 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
95582b00
DD		 1366 && timespec_equal(&ts, &fattr->pre_mtime)) {
1367 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
27dc1cd3 1368 if (S_ISDIR(inode->i_mode))
6edf9609 1369 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
a895b4a1 1370 }
9e6e70f8
TM		 1371 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1372 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1373 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
a6b6d5b8 1374 && !nfs_have_writebacks(inode)) {
27dc1cd3 1375 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
27dc1cd3 1376 }
a895b4a1
TM		 1377}
1378
1da177e4 1379/**
33801147 1380 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
302fad7b
TM		 1381 * @inode: pointer to inode
1382 * @fattr: updated attributes
1da177e4
LT		 1383 *
1384 * Verifies the attribute cache. If we have just changed the attributes,
1385 * so that fattr carries weak cache consistency data, then it may
1386 * also update the ctime/mtime/change_attribute.
1387 */
33801147 1388static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1da177e4
LT		 1389{
1390 struct nfs_inode *nfsi = NFS_I(inode);
1391 loff_t cur_size, new_isize;
2a3f5fd4 1392 unsigned long invalid = 0;
95582b00 1393 struct timespec ts;
dc59250c 1394
4ebe83af 1395 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
01da47bd 1396 return 0;
4ebe83af 1397
ca62b9c3 1398 /* Has the inode gone and changed behind our back? */
9e6e70f8 1399 if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid)
cc89684c 1400 return -ESTALE;
9e6e70f8 1401 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT))
cc89684c 1402 return -ESTALE;
ca62b9c3 1403
651b0e70 1404 if (!nfs_file_has_buffered_writers(nfsi)) {
ca0daa27 1405 /* Verify a few of the more important attributes */
c472c07b 1406 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
16e14375
TM		 1407 invalid |= NFS_INO_INVALID_CHANGE
1408 | NFS_INO_REVAL_PAGECACHE;
1da177e4 1409
95582b00
DD		 1410 ts = timespec64_to_timespec(inode->i_mtime);
1411 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec_equal(&ts, &fattr->mtime))
16e14375 1412 invalid |= NFS_INO_INVALID_MTIME;
ca62b9c3 1413
95582b00
DD		 1414 ts = timespec64_to_timespec(inode->i_ctime);
1415 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec_equal(&ts, &fattr->ctime))
16e14375 1416 invalid |= NFS_INO_INVALID_CTIME;
ca0daa27
TM		 1417
1418 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1419 cur_size = i_size_read(inode);
1420 new_isize = nfs_size_to_loff_t(fattr->size);
1421 if (cur_size != new_isize)
16e14375
TM		 1422 invalid |= NFS_INO_INVALID_SIZE
1423 | NFS_INO_REVAL_PAGECACHE;
ca0daa27 1424 }
9e6e70f8 1425 }
1da177e4
LT		 1426
1427 /* Have any file permissions changed? */
9e6e70f8 1428 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
16e14375
TM		 1429 invalid |= NFS_INO_INVALID_ACCESS
1430 | NFS_INO_INVALID_ACL
1431 | NFS_INO_INVALID_OTHER;
9ff593c4 1432 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
16e14375
TM		 1433 invalid |= NFS_INO_INVALID_ACCESS
1434 | NFS_INO_INVALID_ACL
1435 | NFS_INO_INVALID_OTHER;
9ff593c4 1436 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
16e14375
TM		 1437 invalid |= NFS_INO_INVALID_ACCESS
1438 | NFS_INO_INVALID_ACL
1439 | NFS_INO_INVALID_OTHER;
1da177e4
LT		 1440
1441 /* Has the link count changed? */
9e6e70f8 1442 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
16e14375 1443 invalid |= NFS_INO_INVALID_OTHER;
1da177e4 1444
95582b00
DD		 1445 ts = timespec64_to_timespec(inode->i_atime);
1446 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&ts, &fattr->atime))
2a3f5fd4
TM		 1447 invalid |= NFS_INO_INVALID_ATIME;
1448
1449 if (invalid != 0)
4ebe83af 1450 nfs_set_cache_invalid(inode, invalid);
1da177e4 1451
33801147 1452 nfsi->read_cache_jiffies = fattr->time_start;
1da177e4
LT		 1453 return 0;
1454}
1455
ae05f269 1456static atomic_long_t nfs_attr_generation_counter;
4704f0e2
TM		 1457
1458static unsigned long nfs_read_attr_generation_counter(void)
1459{
ae05f269 1460 return atomic_long_read(&nfs_attr_generation_counter);
4704f0e2
TM		 1461}
1462
1463unsigned long nfs_inc_attr_generation_counter(void)
1464{
ae05f269 1465 return atomic_long_inc_return(&nfs_attr_generation_counter);
4704f0e2 1466}
3235b403 1467EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
4704f0e2
TM		 1468
1469void nfs_fattr_init(struct nfs_fattr *fattr)
1470{
1471 fattr->valid = 0;
1472 fattr->time_start = jiffies;
1473 fattr->gencount = nfs_inc_attr_generation_counter();
6926afd1
TM		 1474 fattr->owner_name = NULL;
1475 fattr->group_name = NULL;
4704f0e2 1476}
ddda8e0a 1477EXPORT_SYMBOL_GPL(nfs_fattr_init);
4704f0e2 1478
140e049c
TM		 1479/**
1480 * nfs_fattr_set_barrier
1481 * @fattr: attributes
1482 *
1483 * Used to set a barrier after an attribute was updated. This
1484 * barrier ensures that older attributes from RPC calls that may
1485 * have raced with our update cannot clobber these new values.
1486 * Note that you are still responsible for ensuring that other
1487 * operations which change the attribute on the server do not
1488 * collide.
1489 */
1490void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1491{
1492 fattr->gencount = nfs_inc_attr_generation_counter();
1493}
1494
2d36bfde
TM		 1495struct nfs_fattr *nfs_alloc_fattr(void)
1496{
1497 struct nfs_fattr *fattr;
1498
1499 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1500 if (fattr != NULL)
1501 nfs_fattr_init(fattr);
1502 return fattr;
1503}
ddda8e0a 1504EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
2d36bfde
TM		 1505
1506struct nfs_fh *nfs_alloc_fhandle(void)
1507{
1508 struct nfs_fh *fh;
1509
1510 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1511 if (fh != NULL)
1512 fh->size = 0;
1513 return fh;
1514}
ddda8e0a 1515EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
2d36bfde 1516
e27d359e 1517#ifdef NFS_DEBUG
d8e0539e
WAA		 1518/*
1519 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1520 * in the same way that wireshark does
1521 *
1522 * @fh: file handle
1523 *
1524 * For debugging only.
1525 */
1526u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1527{
1528 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1529 * not on the result */
1264a2f0 1530 return nfs_fhandle_hash(fh);
d8e0539e 1531}
9e6ee76d 1532EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
d8e0539e
WAA		 1533
1534/*
20d27e92
CL		 1535 * _nfs_display_fhandle - display an NFS file handle on the console
1536 *
1537 * @fh: file handle to display
1538 * @caption: display caption
1539 *
1540 * For debugging only.
1541 */
20d27e92
CL		 1542void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1543{
1544 unsigned short i;
1545
fa68a1ba 1546 if (fh == NULL || fh->size == 0) {
20d27e92
CL		 1547 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1548 return;
1549 }
1550
d8e0539e
WAA		 1551 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1552 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
20d27e92
CL		 1553 for (i = 0; i < fh->size; i += 16) {
1554 __be32 *pos = (__be32 *)&fh->data[i];
1555
1556 switch ((fh->size - i - 1) >> 2) {
1557 case 0:
1558 printk(KERN_DEFAULT " %08x\n",
1559 be32_to_cpup(pos));
1560 break;
1561 case 1:
1562 printk(KERN_DEFAULT " %08x %08x\n",
1563 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1564 break;
1565 case 2:
1566 printk(KERN_DEFAULT " %08x %08x %08x\n",
1567 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1568 be32_to_cpup(pos + 2));
1569 break;
1570 default:
1571 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1572 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1573 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1574 }
1575 }
1576}
9e6ee76d 1577EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
20d27e92
CL		 1578#endif
1579
a10ad176
TM		 1580/**
1581 * nfs_inode_attrs_need_update - check if the inode attributes need updating
302fad7b
TM		 1582 * @inode: pointer to inode
1583 * @fattr: attributes
a10ad176
TM		 1584 *
1585 * Attempt to divine whether or not an RPC call reply carrying stale
1586 * attributes got scheduled after another call carrying updated ones.
1587 *
1588 * To do so, the function first assumes that a more recent ctime means
1589 * that the attributes in fattr are newer, however it also attempt to
1590 * catch the case where ctime either didn't change, or went backwards
1591 * (if someone reset the clock on the server) by looking at whether
1592 * or not this RPC call was started after the inode was last updated.
4704f0e2 1593 * Note also the check for wraparound of 'attr_gencount'
a10ad176
TM		 1594 *
1595 * The function returns 'true' if it thinks the attributes in 'fattr' are
1596 * more recent than the ones cached in the inode.
1597 *
1598 */
1599static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1600{
1601 const struct nfs_inode *nfsi = NFS_I(inode);
1602
4704f0e2 1603 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
4704f0e2 1604 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
a10ad176
TM		 1605}
1606
1607static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1608{
f4ce1299
TM		 1609 int ret;
1610
1611 trace_nfs_refresh_inode_enter(inode);
1612
a10ad176 1613 if (nfs_inode_attrs_need_update(inode, fattr))
f4ce1299
TM		 1614 ret = nfs_update_inode(inode, fattr);
1615 else
1616 ret = nfs_check_inode_attributes(inode, fattr);
1617
1618 trace_nfs_refresh_inode_exit(inode, ret);
1619 return ret;
870a5be8
TM		 1620}
1621
33801147
TM		 1622/**
1623 * nfs_refresh_inode - try to update the inode attribute cache
302fad7b
TM		 1624 * @inode: pointer to inode
1625 * @fattr: updated attributes
33801147
TM		 1626 *
1627 * Check that an RPC call that returned attributes has not overlapped with
1628 * other recent updates of the inode metadata, then decide whether it is
1629 * safe to do a full update of the inode attributes, or whether just to
1630 * call nfs_check_inode_attributes.
1631 */
1632int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1633{
33801147
TM		 1634 int status;
1635
1636 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1637 return 0;
1638 spin_lock(&inode->i_lock);
870a5be8 1639 status = nfs_refresh_inode_locked(inode, fattr);
33801147 1640 spin_unlock(&inode->i_lock);
ef79c097 1641
33801147
TM		 1642 return status;
1643}
ddda8e0a 1644EXPORT_SYMBOL_GPL(nfs_refresh_inode);
33801147 1645
16e14375
TM		 1646static int nfs_post_op_update_inode_locked(struct inode *inode,
1647 struct nfs_fattr *fattr, unsigned int invalid)
d65f557f 1648{
6edf9609
TM		 1649 if (S_ISDIR(inode->i_mode))
1650 invalid |= NFS_INO_INVALID_DATA;
1651 nfs_set_cache_invalid(inode, invalid);
d65f557f
TM		 1652 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1653 return 0;
1654 return nfs_refresh_inode_locked(inode, fattr);
1655}
1656
decf491f
TM		 1657/**
1658 * nfs_post_op_update_inode - try to update the inode attribute cache
302fad7b
TM		 1659 * @inode: pointer to inode
1660 * @fattr: updated attributes
decf491f
TM		 1661 *
1662 * After an operation that has changed the inode metadata, mark the
1663 * attribute cache as being invalid, then try to update it.
f551e44f
CL		 1664 *
1665 * NB: if the server didn't return any post op attributes, this
1666 * function will force the retrieval of attributes before the next
1667 * NFS request. Thus it should be used only for operations that
1668 * are expected to change one or more attributes, to avoid
1669 * unnecessary NFS requests and trips through nfs_update_inode().
decf491f
TM		 1670 */
1671int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1672{
d65f557f 1673 int status;
decf491f 1674
7668fdbe 1675 spin_lock(&inode->i_lock);
92d64e47 1676 nfs_fattr_set_barrier(fattr);
16e14375
TM		 1677 status = nfs_post_op_update_inode_locked(inode, fattr,
1678 NFS_INO_INVALID_CHANGE
d554168f
TM		 1679 | NFS_INO_INVALID_CTIME
1680 | NFS_INO_REVAL_FORCED);
7668fdbe 1681 spin_unlock(&inode->i_lock);
aa9c2669 1682
870a5be8 1683 return status;
decf491f 1684}
1c606fb7 1685EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
decf491f 1686
70ca8852 1687/**
a08a8cd3 1688 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
302fad7b
TM		 1689 * @inode: pointer to inode
1690 * @fattr: updated attributes
70ca8852
TM		 1691 *
1692 * After an operation that has changed the inode metadata, mark the
1693 * attribute cache as being invalid, then try to update it. Fake up
1694 * weak cache consistency data, if none exist.
1695 *
1696 * This function is mainly designed to be used by the ->write_done() functions.
1697 */
a08a8cd3 1698int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
70ca8852 1699{
d65f557f
TM		 1700 int status;
1701
d65f557f
TM		 1702 /* Don't do a WCC update if these attributes are already stale */
1703 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1704 !nfs_inode_attrs_need_update(inode, fattr)) {
9e6e70f8
TM		 1705 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1706 | NFS_ATTR_FATTR_PRESIZE
1707 | NFS_ATTR_FATTR_PREMTIME
1708 | NFS_ATTR_FATTR_PRECTIME);
d65f557f
TM		 1709 goto out_noforce;
1710 }
9e6e70f8
TM		 1711 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1712 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1eb5d98f 1713 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
9e6e70f8 1714 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
70ca8852 1715 }
9e6e70f8
TM		 1716 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1717 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
95582b00 1718 fattr->pre_ctime = timespec64_to_timespec(inode->i_ctime);
9e6e70f8
TM		 1719 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1720 }
1721 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1722 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
95582b00 1723 fattr->pre_mtime = timespec64_to_timespec(inode->i_mtime);
9e6e70f8
TM		 1724 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1725 }
1726 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1727 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
a3d01454 1728 fattr->pre_size = i_size_read(inode);
9e6e70f8 1729 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
70ca8852 1730 }
d65f557f 1731out_noforce:
16e14375
TM		 1732 status = nfs_post_op_update_inode_locked(inode, fattr,
1733 NFS_INO_INVALID_CHANGE
1734 | NFS_INO_INVALID_CTIME
1735 | NFS_INO_INVALID_MTIME);
a08a8cd3
TM		 1736 return status;
1737}
1738
1739/**
1740 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
302fad7b
TM		 1741 * @inode: pointer to inode
1742 * @fattr: updated attributes
a08a8cd3
TM		 1743 *
1744 * After an operation that has changed the inode metadata, mark the
1745 * attribute cache as being invalid, then try to update it. Fake up
1746 * weak cache consistency data, if none exist.
1747 *
1748 * This function is mainly designed to be used by the ->write_done() functions.
1749 */
1750int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1751{
1752 int status;
1753
1754 spin_lock(&inode->i_lock);
8f8ba1d7 1755 nfs_fattr_set_barrier(fattr);
a08a8cd3 1756 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
d65f557f
TM		 1757 spin_unlock(&inode->i_lock);
1758 return status;
70ca8852 1759}
ddda8e0a 1760EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
70ca8852 1761
ea96d1ec
AS		 1762
1763static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1764 struct nfs_fattr *fattr)
1765{
1766 bool ret1 = true, ret2 = true;
1767
1768 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1769 ret1 = (nfsi->fileid == fattr->fileid);
1770 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1771 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1772 return ret1 || ret2;
1773}
1774
1da177e4
LT		 1775/*
1776 * Many nfs protocol calls return the new file attributes after
1777 * an operation. Here we update the inode to reflect the state
1778 * of the server's inode.
1779 *
1780 * This is a bit tricky because we have to make sure all dirty pages
1781 * have been sent off to the server before calling invalidate_inode_pages.
1782 * To make sure no other process adds more write requests while we try
1783 * our best to flush them, we make them sleep during the attribute refresh.
1784 *
1785 * A very similar scenario holds for the dir cache.
1786 */
24aa1fe6 1787static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1da177e4 1788{
8b4bdcf8 1789 struct nfs_server *server;
1da177e4 1790 struct nfs_inode *nfsi = NFS_I(inode);
951a143b 1791 loff_t cur_isize, new_isize;
2a3f5fd4 1792 unsigned long invalid = 0;
3e7d950a 1793 unsigned long now = jiffies;
62ab460c 1794 unsigned long save_cache_validity;
651b0e70 1795 bool have_writers = nfs_file_has_buffered_writers(nfsi);
944171cb 1796 bool cache_revalidated = true;
0b467264 1797 bool attr_changed = false;
c80d17c5 1798 bool have_delegation;
1da177e4 1799
1e8968c5 1800 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
3110ff80 1801 __func__, inode->i_sb->s_id, inode->i_ino,
4f1abd22 1802 nfs_display_fhandle_hash(NFS_FH(inode)),
1da177e4
LT		 1803 atomic_read(&inode->i_count), fattr->valid);
1804
ea96d1ec 1805 if (!nfs_fileid_valid(nfsi, fattr)) {
e73e6c9e
MT		 1806 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1807 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1808 NFS_SERVER(inode)->nfs_client->cl_hostname,
1809 inode->i_sb->s_id, (long long)nfsi->fileid,
1810 (long long)fattr->fileid);
1811 goto out_err;
1812 }
1da177e4
LT		 1813
1814 /*
1815 * Make sure the inode's type hasn't changed.
1816 */
e73e6c9e
MT		 1817 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1818 /*
1819 * Big trouble! The inode has become a different object.
1820 */
1e8968c5 1821 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
e73e6c9e
MT		 1822 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1823 goto out_err;
1824 }
1da177e4 1825
8b4bdcf8 1826 server = NFS_SERVER(inode);
a0356862 1827 /* Update the fsid? */
9e6e70f8 1828 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
c37dcd33 1829 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
36d43a43 1830 !IS_AUTOMOUNT(inode))
8b4bdcf8
TM		 1831 server->fsid = fattr->fsid;
1832
c80d17c5
TM		 1833 /* Save the delegation state before clearing cache_validity */
1834 have_delegation = nfs_have_delegated_attributes(inode);
1835
1da177e4
LT		 1836 /*
1837 * Update the read time so we don't revalidate too often.
1838 */
33801147 1839 nfsi->read_cache_jiffies = fattr->time_start;
3e7d950a 1840
62ab460c
TM		 1841 save_cache_validity = nfsi->cache_validity;
1842 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1843 | NFS_INO_INVALID_ATIME
1844 | NFS_INO_REVAL_FORCED
1845 | NFS_INO_REVAL_PAGECACHE);
1da177e4 1846
a895b4a1 1847 /* Do atomic weak cache consistency updates */
783b194c 1848 nfs_wcc_update_inode(inode, fattr);
a895b4a1 1849
944171cb
BC		 1850 if (pnfs_layoutcommit_outstanding(inode)) {
1851 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1852 cache_revalidated = false;
1853 }
10b7e9ad 1854
47aabaa7 1855 /* More cache consistency checks */
9e6e70f8 1856 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
c472c07b 1857 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
38512aa9 1858 /* Could it be a race with writeback? */
c80d17c5 1859 if (!(have_writers || have_delegation)) {
0b467264 1860 invalid |= NFS_INO_INVALID_DATA
38512aa9
TM		 1861 | NFS_INO_INVALID_ACCESS
1862 | NFS_INO_INVALID_ACL;
cac88f94 1863 /* Force revalidate of all attributes */
16e14375
TM		 1864 save_cache_validity |= NFS_INO_INVALID_CTIME
1865 | NFS_INO_INVALID_MTIME
1866 | NFS_INO_INVALID_SIZE
1867 | NFS_INO_INVALID_OTHER;
38512aa9
TM		 1868 if (S_ISDIR(inode->i_mode))
1869 nfs_force_lookup_revalidate(inode);
c80d17c5
TM		 1870 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1871 inode->i_sb->s_id,
1872 inode->i_ino);
38512aa9 1873 }
1eb5d98f 1874 inode_set_iversion_raw(inode, fattr->change_attr);
0b467264 1875 attr_changed = true;
9e6e70f8 1876 }
ade14a7d 1877 } else {
8619ddd0 1878 nfsi->cache_validity |= save_cache_validity &
16e14375 1879 (NFS_INO_INVALID_CHANGE
8619ddd0
TM		 1880 | NFS_INO_REVAL_PAGECACHE
1881 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1882 cache_revalidated = false;
1883 }
9e6e70f8
TM		 1884
1885 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
95582b00 1886 inode->i_mtime = timespec_to_timespec64(fattr->mtime);
ade14a7d 1887 } else if (server->caps & NFS_CAP_MTIME) {
43b6535e 1888 nfsi->cache_validity |= save_cache_validity &
16e14375 1889 (NFS_INO_INVALID_MTIME
62ab460c 1890 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1891 cache_revalidated = false;
1892 }
62ab460c 1893
9e6e70f8 1894 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
95582b00 1895 inode->i_ctime = timespec_to_timespec64(fattr->ctime);
ade14a7d 1896 } else if (server->caps & NFS_CAP_CTIME) {
43b6535e 1897 nfsi->cache_validity |= save_cache_validity &
16e14375 1898 (NFS_INO_INVALID_CTIME
62ab460c 1899 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1900 cache_revalidated = false;
1901 }
47aabaa7 1902
951a143b 1903 /* Check if our cached file size is stale */
9e6e70f8
TM		 1904 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1905 new_isize = nfs_size_to_loff_t(fattr->size);
1906 cur_isize = i_size_read(inode);
c80d17c5 1907 if (new_isize != cur_isize && !have_delegation) {
9e6e70f8
TM		 1908 /* Do we perhaps have any outstanding writes, or has
1909 * the file grown beyond our last write? */
a6b6d5b8 1910 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
9e6e70f8 1911 i_size_write(inode, new_isize);
ca0daa27 1912 if (!have_writers)
16e14375 1913 invalid |= NFS_INO_INVALID_DATA;
0b467264 1914 attr_changed = true;
9e6e70f8 1915 }
60c16ea8
HJ		 1916 dprintk("NFS: isize change on server for file %s/%ld "
1917 "(%Ld to %Ld)\n",
1918 inode->i_sb->s_id,
1919 inode->i_ino,
1920 (long long)cur_isize,
1921 (long long)new_isize);
1da177e4 1922 }
ade14a7d 1923 } else {
43b6535e 1924 nfsi->cache_validity |= save_cache_validity &
16e14375 1925 (NFS_INO_INVALID_SIZE
62ab460c
TM		 1926 | NFS_INO_REVAL_PAGECACHE
1927 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1928 cache_revalidated = false;
1929 }
1da177e4 1930
1da177e4 1931
9e6e70f8 1932 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
95582b00 1933 inode->i_atime = timespec_to_timespec64(fattr->atime);
ade14a7d 1934 else if (server->caps & NFS_CAP_ATIME) {
43b6535e
TM		 1935 nfsi->cache_validity |= save_cache_validity &
1936 (NFS_INO_INVALID_ATIME
62ab460c 1937 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1938 cache_revalidated = false;
1939 }
1da177e4 1940
9e6e70f8
TM		 1941 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1942 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
9b4b3513
TM		 1943 umode_t newmode = inode->i_mode & S_IFMT;
1944 newmode |= fattr->mode & S_IALLUGO;
1945 inode->i_mode = newmode;
16e14375 1946 invalid |= NFS_INO_INVALID_ACCESS
0b467264
TM		 1947 | NFS_INO_INVALID_ACL;
1948 attr_changed = true;
9e6e70f8 1949 }
ade14a7d 1950 } else if (server->caps & NFS_CAP_MODE) {
43b6535e 1951 nfsi->cache_validity |= save_cache_validity &
0b467264 1952 (NFS_INO_INVALID_OTHER
62ab460c 1953 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1954 cache_revalidated = false;
1955 }
62ab460c 1956
9e6e70f8 1957 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
9ff593c4 1958 if (!uid_eq(inode->i_uid, fattr->uid)) {
16e14375 1959 invalid |= NFS_INO_INVALID_ACCESS
0b467264 1960 | NFS_INO_INVALID_ACL;
9e6e70f8 1961 inode->i_uid = fattr->uid;
0b467264 1962 attr_changed = true;
9e6e70f8 1963 }
ade14a7d 1964 } else if (server->caps & NFS_CAP_OWNER) {
43b6535e 1965 nfsi->cache_validity |= save_cache_validity &
0b467264 1966 (NFS_INO_INVALID_OTHER
62ab460c 1967 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1968 cache_revalidated = false;
1969 }
62ab460c 1970
9e6e70f8 1971 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
9ff593c4 1972 if (!gid_eq(inode->i_gid, fattr->gid)) {
16e14375 1973 invalid |= NFS_INO_INVALID_ACCESS
0b467264 1974 | NFS_INO_INVALID_ACL;
9e6e70f8 1975 inode->i_gid = fattr->gid;
0b467264 1976 attr_changed = true;
9e6e70f8 1977 }
ade14a7d 1978 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
43b6535e 1979 nfsi->cache_validity |= save_cache_validity &
0b467264 1980 (NFS_INO_INVALID_OTHER
62ab460c 1981 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1982 cache_revalidated = false;
1983 }
921615f1 1984
9e6e70f8
TM		 1985 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1986 if (inode->i_nlink != fattr->nlink) {
9e6e70f8
TM		 1987 if (S_ISDIR(inode->i_mode))
1988 invalid |= NFS_INO_INVALID_DATA;
bfe86848 1989 set_nlink(inode, fattr->nlink);
0b467264 1990 attr_changed = true;
9e6e70f8 1991 }
ade14a7d 1992 } else if (server->caps & NFS_CAP_NLINK) {
43b6535e 1993 nfsi->cache_validity |= save_cache_validity &
16e14375 1994 (NFS_INO_INVALID_OTHER
62ab460c 1995 | NFS_INO_REVAL_FORCED);
ade14a7d
TM		 1996 cache_revalidated = false;
1997 }
1da177e4 1998
9e6e70f8 1999 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1da177e4
LT		 2000 /*
2001 * report the blocks in 512byte units
2002 */
2003 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
ade14a7d 2004 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
9e6e70f8 2005 inode->i_blocks = fattr->du.nfs2.blocks;
ade14a7d
TM		 2006 else
2007 cache_revalidated = false;
1da177e4
LT		 2008
2009 /* Update attrtimeo value if we're out of the unstable period */
0b467264 2010 if (attr_changed) {
cac88f94 2011 invalid &= ~NFS_INO_INVALID_ATTR;
91d5b470 2012 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1da177e4 2013 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
3e7d950a 2014 nfsi->attrtimeo_timestamp = now;
f5062003 2015 /* Set barrier to be more recent than all outstanding updates */
4704f0e2 2016 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
6d2b2966 2017 } else {
ade14a7d
TM		 2018 if (cache_revalidated) {
2019 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2020 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2021 nfsi->attrtimeo <<= 1;
2022 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2023 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2024 }
6d2b2966
TM		 2025 nfsi->attrtimeo_timestamp = now;
2026 }
f5062003
TM		 2027 /* Set the barrier to be more recent than this fattr */
2028 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
2029 nfsi->attr_gencount = fattr->gencount;
1da177e4 2030 }
c812012f 2031
1da177e4
LT		 2032 /* Don't invalidate the data if we were to blame */
2033 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2034 || S_ISLNK(inode->i_mode)))
2035 invalid &= ~NFS_INO_INVALID_DATA;
c80d17c5 2036 nfs_set_cache_invalid(inode, invalid);
de242c0b 2037
1da177e4 2038 return 0;
b37b03b7 2039 out_err:
1da177e4
LT		 2040 /*
2041 * No need to worry about unhashing the dentry, as the
2042 * lookup validation will know that the inode is bad.
2043 * (But we fall through to invalidate the caches.)
2044 */
2045 nfs_invalidate_inode(inode);
1da177e4
LT		 2046 return -ESTALE;
2047}
2048
f7b422b1 2049struct inode *nfs_alloc_inode(struct super_block *sb)
1da177e4
LT		 2050{
2051 struct nfs_inode *nfsi;
c456aacf 2052 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1da177e4
LT		 2053 if (!nfsi)
2054 return NULL;
55296809
CL		 2055 nfsi->flags = 0UL;
2056 nfsi->cache_validity = 0UL;
89d77c8f 2057#if IS_ENABLED(CONFIG_NFS_V4)
e50a1c2e
BF		 2058 nfsi->nfs4_acl = NULL;
2059#endif /* CONFIG_NFS_V4 */
1da177e4
LT		 2060 return &nfsi->vfs_inode;
2061}
89d77c8f 2062EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1da177e4 2063
ca1a199e 2064void nfs_free_inode(struct inode *inode)
1da177e4
LT		 2065{
2066 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2067}
ca1a199e 2068EXPORT_SYMBOL_GPL(nfs_free_inode);
fa0d7e3d 2069
d75d5414
AM		 2070static inline void nfs4_init_once(struct nfs_inode *nfsi)
2071{
89d77c8f 2072#if IS_ENABLED(CONFIG_NFS_V4)
d75d5414
AM		 2073 INIT_LIST_HEAD(&nfsi->open_states);
2074 nfsi->delegation = NULL;
d75d5414 2075 init_rwsem(&nfsi->rwsem);
e5e94017 2076 nfsi->layout = NULL;
d75d5414
AM		 2077#endif
2078}
f7b422b1 2079
51cc5068 2080static void init_once(void *foo)
1da177e4
LT		 2081{
2082 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2083
a35afb83 2084 inode_init_once(&nfsi->vfs_inode);
a35afb83
CL		 2085 INIT_LIST_HEAD(&nfsi->open_files);
2086 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2087 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
ea2cf228 2088 INIT_LIST_HEAD(&nfsi->commit_info.list);
a6b6d5b8 2089 atomic_long_set(&nfsi->nrequests, 0);
5cb953d4 2090 atomic_long_set(&nfsi->commit_info.ncommit, 0);
1a0de48a 2091 atomic_set(&nfsi->commit_info.rpcs_out, 0);
884be175 2092 init_rwsem(&nfsi->rmdir_sem);
e824f99a 2093 mutex_init(&nfsi->commit_mutex);
a35afb83 2094 nfs4_init_once(nfsi);
1da177e4 2095}
20c2df83 2096
f7b422b1 2097static int __init nfs_init_inodecache(void)
1da177e4
LT		 2098{
2099 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2100 sizeof(struct nfs_inode),
fffb60f9 2101 0, (SLAB_RECLAIM_ACCOUNT|
5d097056 2102 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
20c2df83 2103 init_once);
1da177e4
LT		 2104 if (nfs_inode_cachep == NULL)
2105 return -ENOMEM;
2106
2107 return 0;
2108}
2109
266bee88 2110static void nfs_destroy_inodecache(void)
1da177e4 2111{
8c0a8537
KS		 2112 /*
2113 * Make sure all delayed rcu free inodes are flushed before we
2114 * destroy cache.
2115 */
2116 rcu_barrier();
1a1d92c1 2117 kmem_cache_destroy(nfs_inode_cachep);
1da177e4
LT		 2118}
2119
5746006f 2120struct workqueue_struct *nfsiod_workqueue;
89d77c8f 2121EXPORT_SYMBOL_GPL(nfsiod_workqueue);
5746006f
TM		 2122
2123/*
2124 * start up the nfsiod workqueue
2125 */
2126static int nfsiod_start(void)
2127{
2128 struct workqueue_struct *wq;
2129 dprintk("RPC: creating workqueue nfsiod\n");
ada609ee 2130 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
5746006f
TM		 2131 if (wq == NULL)
2132 return -ENOMEM;
2133 nfsiod_workqueue = wq;
2134 return 0;
2135}
2136
2137/*
2138 * Destroy the nfsiod workqueue
2139 */
2140static void nfsiod_stop(void)
2141{
2142 struct workqueue_struct *wq;
2143
2144 wq = nfsiod_workqueue;
2145 if (wq == NULL)
2146 return;
2147 nfsiod_workqueue = NULL;
2148 destroy_workqueue(wq);
2149}
2150
c7d03a00 2151unsigned int nfs_net_id;
9e2e74db 2152EXPORT_SYMBOL_GPL(nfs_net_id);
1b340d01
SK		 2153
2154static int nfs_net_init(struct net *net)
2155{
6b13168b 2156 nfs_clients_init(net);
65b38851 2157 return nfs_fs_proc_net_init(net);
1b340d01
SK		 2158}
2159
2160static void nfs_net_exit(struct net *net)
2161{
b0b5352d
VA		 2162 struct nfs_net *nn = net_generic(net, nfs_net_id);
2163
65b38851 2164 nfs_fs_proc_net_exit(net);
28cd1b3f 2165 nfs_cleanup_cb_ident_idr(net);
b0b5352d
VA		 2166 WARN_ON_ONCE(!list_empty(&nn->nfs_client_list));
2167 WARN_ON_ONCE(!list_empty(&nn->nfs_volume_list));
1b340d01
SK		 2168}
2169
2170static struct pernet_operations nfs_net_ops = {
2171 .init = nfs_net_init,
2172 .exit = nfs_net_exit,
2173 .id = &nfs_net_id,
2174 .size = sizeof(struct nfs_net),
2175};
2176
1da177e4
LT		 2177/*
2178 * Initialize NFS
2179 */
2180static int __init init_nfs_fs(void)
2181{
2182 int err;
2183
1b340d01 2184 err = register_pernet_subsys(&nfs_net_ops);
e571cbf1 2185 if (err < 0)
89d77c8f 2186 goto out9;
e571cbf1 2187
8ec442ae
DH		 2188 err = nfs_fscache_register();
2189 if (err < 0)
89d77c8f 2190 goto out8;
8ec442ae 2191
5746006f
TM		 2192 err = nfsiod_start();
2193 if (err)
89d77c8f 2194 goto out7;
5746006f 2195
6aaca566
DH		 2196 err = nfs_fs_proc_init();
2197 if (err)
89d77c8f 2198 goto out6;
6aaca566 2199
1da177e4
LT		 2200 err = nfs_init_nfspagecache();
2201 if (err)
89d77c8f 2202 goto out5;
1da177e4
LT		 2203
2204 err = nfs_init_inodecache();
2205 if (err)
89d77c8f 2206 goto out4;
1da177e4
LT		 2207
2208 err = nfs_init_readpagecache();
2209 if (err)
89d77c8f 2210 goto out3;
1da177e4
LT		 2211
2212 err = nfs_init_writepagecache();
2213 if (err)
89d77c8f 2214 goto out2;
1da177e4 2215
1da177e4
LT		 2216 err = nfs_init_directcache();
2217 if (err)
89d77c8f 2218 goto out1;
1da177e4 2219
ec7652aa 2220 rpc_proc_register(&init_net, &nfs_rpcstat);
cd738ee9
KM		 2221
2222 err = register_nfs_fs();
2223 if (err)
129d1977
BS		 2224 goto out0;
2225
1da177e4 2226 return 0;
129d1977 2227out0:
ec7652aa 2228 rpc_proc_unregister(&init_net, "nfs");
1da177e4 2229 nfs_destroy_directcache();
89d77c8f 2230out1:
129d1977 2231 nfs_destroy_writepagecache();
89d77c8f 2232out2:
129d1977 2233 nfs_destroy_readpagecache();
89d77c8f 2234out3:
129d1977 2235 nfs_destroy_inodecache();
89d77c8f 2236out4:
129d1977 2237 nfs_destroy_nfspagecache();
89d77c8f 2238out5:
129d1977 2239 nfs_fs_proc_exit();
89d77c8f 2240out6:
129d1977 2241 nfsiod_stop();
89d77c8f 2242out7:
129d1977 2243 nfs_fscache_unregister();
89d77c8f 2244out8:
129d1977 2245 unregister_pernet_subsys(&nfs_net_ops);
89d77c8f 2246out9:
1da177e4
LT		 2247 return err;
2248}
2249
2250static void __exit exit_nfs_fs(void)
2251{
1da177e4 2252 nfs_destroy_directcache();
1da177e4
LT		 2253 nfs_destroy_writepagecache();
2254 nfs_destroy_readpagecache();
2255 nfs_destroy_inodecache();
2256 nfs_destroy_nfspagecache();
8ec442ae 2257 nfs_fscache_unregister();
1b340d01 2258 unregister_pernet_subsys(&nfs_net_ops);
ec7652aa 2259 rpc_proc_unregister(&init_net, "nfs");
f7b422b1 2260 unregister_nfs_fs();
6aaca566 2261 nfs_fs_proc_exit();
5746006f 2262 nfsiod_stop();
1da177e4
LT		 2263}
2264
2265/* Not quite true; I just maintain it */
2266MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2267MODULE_LICENSE("GPL");
f43bf0be 2268module_param(enable_ino64, bool, 0644);
1da177e4
LT		 2269
2270module_init(init_nfs_fs)
2271module_exit(exit_nfs_fs)
Linux 6.x block layer and io_uring tree(s)