1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * linux/fs/nfs/inode.c
4 *
5 * Copyright (C) 1992 Rick Sladkey
6 *
7 * nfs inode and superblock handling functions
8 *
9 * Modularised by Alan Cox <alan@lxorguk.ukuu.org.uk>, while hacking some
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
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>
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>
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>
44
45 #include "nfs4_fs.h"
46 #include "callback.h"
47 #include "delegation.h"
48 #include "iostat.h"
49 #include "internal.h"
50 #include "fscache.h"
51 #include "pnfs.h"
52 #include "nfs.h"
53 #include "netns.h"
54 #include "sysfs.h"
55
56 #include "nfstrace.h"
57
58 #define NFSDBG_FACILITY NFSDBG_VFS
59
60 #define NFS_64_BIT_INODE_NUMBERS_ENABLED 1
61
62 /* Default is to see 64-bit inode numbers */
63 static bool enable_ino64 = NFS_64_BIT_INODE_NUMBERS_ENABLED;
64
65 static int nfs_update_inode(struct inode *, struct nfs_fattr *);
66
67 static struct kmem_cache * nfs_inode_cachep;
68
69 static inline unsigned long
nfs_fattr_to_ino_t(struct nfs_fattr * fattr)70 nfs_fattr_to_ino_t(struct nfs_fattr *fattr)
71 {
72 return nfs_fileid_to_ino_t(fattr->fileid);
73 }
74
nfs_wait_killable(int mode)75 static int nfs_wait_killable(int mode)
76 {
77 freezable_schedule_unsafe();
78 if (signal_pending_state(mode, current))
79 return -ERESTARTSYS;
80 return 0;
81 }
82
nfs_wait_bit_killable(struct wait_bit_key * key,int mode)83 int nfs_wait_bit_killable(struct wait_bit_key *key, int mode)
84 {
85 return nfs_wait_killable(mode);
86 }
87 EXPORT_SYMBOL_GPL(nfs_wait_bit_killable);
88
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 */
nfs_compat_user_ino64(u64 fileid)96 u64 nfs_compat_user_ino64(u64 fileid)
97 {
98 #ifdef CONFIG_COMPAT
99 compat_ulong_t ino;
100 #else
101 unsigned long ino;
102 #endif
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
nfs_drop_inode(struct inode * inode)112 int nfs_drop_inode(struct inode *inode)
113 {
114 return NFS_STALE(inode) || generic_drop_inode(inode);
115 }
116 EXPORT_SYMBOL_GPL(nfs_drop_inode);
117
nfs_clear_inode(struct inode * inode)118 void nfs_clear_inode(struct inode *inode)
119 {
120 /*
121 * The following should never happen...
122 */
123 WARN_ON_ONCE(nfs_have_writebacks(inode));
124 WARN_ON_ONCE(!list_empty(&NFS_I(inode)->open_files));
125 nfs_zap_acl_cache(inode);
126 nfs_access_zap_cache(inode);
127 nfs_fscache_clear_inode(inode);
128 }
129 EXPORT_SYMBOL_GPL(nfs_clear_inode);
130
nfs_evict_inode(struct inode * inode)131 void nfs_evict_inode(struct inode *inode)
132 {
133 truncate_inode_pages_final(&inode->i_data);
134 clear_inode(inode);
135 nfs_clear_inode(inode);
136 }
137
nfs_sync_inode(struct inode * inode)138 int nfs_sync_inode(struct inode *inode)
139 {
140 inode_dio_wait(inode);
141 return nfs_wb_all(inode);
142 }
143 EXPORT_SYMBOL_GPL(nfs_sync_inode);
144
145 /**
146 * nfs_sync_mapping - helper to flush all mmapped dirty data to disk
147 * @mapping: pointer to struct address_space
148 */
nfs_sync_mapping(struct address_space * mapping)149 int nfs_sync_mapping(struct address_space *mapping)
150 {
151 int ret = 0;
152
153 if (mapping->nrpages != 0) {
154 unmap_mapping_range(mapping, 0, 0, 0);
155 ret = nfs_wb_all(mapping->host);
156 }
157 return ret;
158 }
159
nfs_attribute_timeout(struct inode * inode)160 static 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
nfs_check_cache_invalid_delegated(struct inode * inode,unsigned long flags)167 static 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
nfs_check_cache_invalid_not_delegated(struct inode * inode,unsigned long flags)178 static 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
nfs_check_cache_invalid(struct inode * inode,unsigned long flags)189 bool 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 EXPORT_SYMBOL_GPL(nfs_check_cache_invalid);
197
nfs_set_cache_invalid(struct inode * inode,unsigned long flags)198 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
199 {
200 struct nfs_inode *nfsi = NFS_I(inode);
201 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
202
203 if (have_delegation) {
204 if (!(flags & NFS_INO_REVAL_FORCED))
205 flags &= ~NFS_INO_INVALID_OTHER;
206 flags &= ~(NFS_INO_INVALID_CHANGE
207 | NFS_INO_INVALID_SIZE
208 | NFS_INO_REVAL_PAGECACHE
209 | NFS_INO_INVALID_XATTR);
210 } else if (flags & NFS_INO_REVAL_PAGECACHE)
211 flags |= NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE;
212
213 if (inode->i_mapping->nrpages == 0)
214 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
215 nfsi->cache_validity |= flags;
216 if (flags & NFS_INO_INVALID_DATA)
217 nfs_fscache_invalidate(inode);
218 }
219
220 /*
221 * Invalidate the local caches
222 */
nfs_zap_caches_locked(struct inode * inode)223 static void nfs_zap_caches_locked(struct inode *inode)
224 {
225 struct nfs_inode *nfsi = NFS_I(inode);
226 int mode = inode->i_mode;
227
228 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
229
230 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
231 nfsi->attrtimeo_timestamp = jiffies;
232
233 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
234 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
235 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
236 | NFS_INO_INVALID_DATA
237 | NFS_INO_INVALID_ACCESS
238 | NFS_INO_INVALID_ACL
239 | NFS_INO_INVALID_XATTR
240 | NFS_INO_REVAL_PAGECACHE);
241 } else
242 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
243 | NFS_INO_INVALID_ACCESS
244 | NFS_INO_INVALID_ACL
245 | NFS_INO_INVALID_XATTR
246 | NFS_INO_REVAL_PAGECACHE);
247 nfs_zap_label_cache_locked(nfsi);
248 }
249
nfs_zap_caches(struct inode * inode)250 void nfs_zap_caches(struct inode *inode)
251 {
252 spin_lock(&inode->i_lock);
253 nfs_zap_caches_locked(inode);
254 spin_unlock(&inode->i_lock);
255 }
256
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)257 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
258 {
259 if (mapping->nrpages != 0) {
260 spin_lock(&inode->i_lock);
261 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
262 spin_unlock(&inode->i_lock);
263 }
264 }
265
nfs_zap_acl_cache(struct inode * inode)266 void nfs_zap_acl_cache(struct inode *inode)
267 {
268 void (*clear_acl_cache)(struct inode *);
269
270 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
271 if (clear_acl_cache != NULL)
272 clear_acl_cache(inode);
273 spin_lock(&inode->i_lock);
274 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
275 spin_unlock(&inode->i_lock);
276 }
277 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
278
nfs_invalidate_atime(struct inode * inode)279 void nfs_invalidate_atime(struct inode *inode)
280 {
281 spin_lock(&inode->i_lock);
282 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
283 spin_unlock(&inode->i_lock);
284 }
285 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
286
287 /*
288 * Invalidate, but do not unhash, the inode.
289 * NB: must be called with inode->i_lock held!
290 */
nfs_set_inode_stale_locked(struct inode * inode)291 static void nfs_set_inode_stale_locked(struct inode *inode)
292 {
293 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
294 nfs_zap_caches_locked(inode);
295 trace_nfs_set_inode_stale(inode);
296 }
297
nfs_set_inode_stale(struct inode * inode)298 void nfs_set_inode_stale(struct inode *inode)
299 {
300 spin_lock(&inode->i_lock);
301 nfs_set_inode_stale_locked(inode);
302 spin_unlock(&inode->i_lock);
303 }
304
305 struct nfs_find_desc {
306 struct nfs_fh *fh;
307 struct nfs_fattr *fattr;
308 };
309
310 /*
311 * In NFSv3 we can have 64bit inode numbers. In order to support
312 * this, and re-exported directories (also seen in NFSv2)
313 * we are forced to allow 2 different inodes to have the same
314 * i_ino.
315 */
316 static int
nfs_find_actor(struct inode * inode,void * opaque)317 nfs_find_actor(struct inode *inode, void *opaque)
318 {
319 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
320 struct nfs_fh *fh = desc->fh;
321 struct nfs_fattr *fattr = desc->fattr;
322
323 if (NFS_FILEID(inode) != fattr->fileid)
324 return 0;
325 if (inode_wrong_type(inode, fattr->mode))
326 return 0;
327 if (nfs_compare_fh(NFS_FH(inode), fh))
328 return 0;
329 if (is_bad_inode(inode) || NFS_STALE(inode))
330 return 0;
331 return 1;
332 }
333
334 static int
nfs_init_locked(struct inode * inode,void * opaque)335 nfs_init_locked(struct inode *inode, void *opaque)
336 {
337 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
338 struct nfs_fattr *fattr = desc->fattr;
339
340 set_nfs_fileid(inode, fattr->fileid);
341 inode->i_mode = fattr->mode;
342 nfs_copy_fh(NFS_FH(inode), desc->fh);
343 return 0;
344 }
345
346 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)347 static void nfs_clear_label_invalid(struct inode *inode)
348 {
349 spin_lock(&inode->i_lock);
350 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
351 spin_unlock(&inode->i_lock);
352 }
353
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr,struct nfs4_label * label)354 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
355 struct nfs4_label *label)
356 {
357 int error;
358
359 if (label == NULL)
360 return;
361
362 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
363 error = security_inode_notifysecctx(inode, label->label,
364 label->len);
365 if (error)
366 printk(KERN_ERR "%s() %s %d "
367 "security_inode_notifysecctx() %d\n",
368 __func__,
369 (char *)label->label,
370 label->len, error);
371 nfs_clear_label_invalid(inode);
372 }
373 }
374
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)375 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
376 {
377 struct nfs4_label *label = NULL;
378 int minor_version = server->nfs_client->cl_minorversion;
379
380 if (minor_version < 2)
381 return label;
382
383 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
384 return label;
385
386 label = kzalloc(sizeof(struct nfs4_label), flags);
387 if (label == NULL)
388 return ERR_PTR(-ENOMEM);
389
390 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
391 if (label->label == NULL) {
392 kfree(label);
393 return ERR_PTR(-ENOMEM);
394 }
395 label->len = NFS4_MAXLABELLEN;
396
397 return label;
398 }
399 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
400 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr,struct nfs4_label * label)401 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
402 struct nfs4_label *label)
403 {
404 }
405 #endif
406 EXPORT_SYMBOL_GPL(nfs_setsecurity);
407
408 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
409 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)410 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
411 {
412 struct nfs_find_desc desc = {
413 .fh = fh,
414 .fattr = fattr,
415 };
416 struct inode *inode;
417 unsigned long hash;
418
419 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
420 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
421 return NULL;
422
423 hash = nfs_fattr_to_ino_t(fattr);
424 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
425
426 dprintk("%s: returning %p\n", __func__, inode);
427 return inode;
428 }
429
430 /*
431 * This is our front-end to iget that looks up inodes by file handle
432 * instead of inode number.
433 */
434 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr,struct nfs4_label * label)435 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
436 {
437 struct nfs_find_desc desc = {
438 .fh = fh,
439 .fattr = fattr
440 };
441 struct inode *inode = ERR_PTR(-ENOENT);
442 unsigned long hash;
443
444 nfs_attr_check_mountpoint(sb, fattr);
445
446 if (nfs_attr_use_mounted_on_fileid(fattr))
447 fattr->fileid = fattr->mounted_on_fileid;
448 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
449 goto out_no_inode;
450 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
451 goto out_no_inode;
452
453 hash = nfs_fattr_to_ino_t(fattr);
454
455 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
456 if (inode == NULL) {
457 inode = ERR_PTR(-ENOMEM);
458 goto out_no_inode;
459 }
460
461 if (inode->i_state & I_NEW) {
462 struct nfs_inode *nfsi = NFS_I(inode);
463 unsigned long now = jiffies;
464
465 /* We set i_ino for the few things that still rely on it,
466 * such as stat(2) */
467 inode->i_ino = hash;
468
469 /* We can't support update_atime(), since the server will reset it */
470 inode->i_flags |= S_NOATIME|S_NOCMTIME;
471 inode->i_mode = fattr->mode;
472 nfsi->cache_validity = 0;
473 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
474 && nfs_server_capable(inode, NFS_CAP_MODE))
475 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
476 /* Why so? Because we want revalidate for devices/FIFOs, and
477 * that's precisely what we have in nfs_file_inode_operations.
478 */
479 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
480 if (S_ISREG(inode->i_mode)) {
481 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
482 inode->i_data.a_ops = &nfs_file_aops;
483 } else if (S_ISDIR(inode->i_mode)) {
484 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
485 inode->i_fop = &nfs_dir_operations;
486 inode->i_data.a_ops = &nfs_dir_aops;
487 /* Deal with crossing mountpoints */
488 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
489 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
490 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
491 inode->i_op = &nfs_referral_inode_operations;
492 else
493 inode->i_op = &nfs_mountpoint_inode_operations;
494 inode->i_fop = NULL;
495 inode->i_flags |= S_AUTOMOUNT;
496 }
497 } else if (S_ISLNK(inode->i_mode)) {
498 inode->i_op = &nfs_symlink_inode_operations;
499 inode_nohighmem(inode);
500 } else
501 init_special_inode(inode, inode->i_mode, fattr->rdev);
502
503 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
504 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
505 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
506 inode_set_iversion_raw(inode, 0);
507 inode->i_size = 0;
508 clear_nlink(inode);
509 inode->i_uid = make_kuid(&init_user_ns, -2);
510 inode->i_gid = make_kgid(&init_user_ns, -2);
511 inode->i_blocks = 0;
512 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
513 nfsi->write_io = 0;
514 nfsi->read_io = 0;
515
516 nfsi->read_cache_jiffies = fattr->time_start;
517 nfsi->attr_gencount = fattr->gencount;
518 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
519 inode->i_atime = fattr->atime;
520 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
521 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
522 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
523 inode->i_mtime = fattr->mtime;
524 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
525 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
526 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
527 inode->i_ctime = fattr->ctime;
528 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
529 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
530 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
531 inode_set_iversion_raw(inode, fattr->change_attr);
532 else
533 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
534 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
535 inode->i_size = nfs_size_to_loff_t(fattr->size);
536 else
537 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
538 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
539 set_nlink(inode, fattr->nlink);
540 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
541 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
542 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
543 inode->i_uid = fattr->uid;
544 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
545 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
546 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
547 inode->i_gid = fattr->gid;
548 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
549 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
550 if (nfs_server_capable(inode, NFS_CAP_XATTR))
551 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
552 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
553 inode->i_blocks = fattr->du.nfs2.blocks;
554 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
555 /*
556 * report the blocks in 512byte units
557 */
558 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
559 }
560
561 if (nfsi->cache_validity != 0)
562 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
563
564 nfs_setsecurity(inode, fattr, label);
565
566 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
567 nfsi->attrtimeo_timestamp = now;
568 nfsi->access_cache = RB_ROOT;
569
570 nfs_fscache_init_inode(inode);
571
572 unlock_new_inode(inode);
573 } else {
574 int err = nfs_refresh_inode(inode, fattr);
575 if (err < 0) {
576 iput(inode);
577 inode = ERR_PTR(err);
578 goto out_no_inode;
579 }
580 }
581 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
582 inode->i_sb->s_id,
583 (unsigned long long)NFS_FILEID(inode),
584 nfs_display_fhandle_hash(fh),
585 atomic_read(&inode->i_count));
586
587 out:
588 return inode;
589
590 out_no_inode:
591 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
592 goto out;
593 }
594 EXPORT_SYMBOL_GPL(nfs_fhget);
595
596 #define NFS_VALID_ATTRS (ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_SIZE|ATTR_ATIME|ATTR_ATIME_SET|ATTR_MTIME|ATTR_MTIME_SET|ATTR_FILE|ATTR_OPEN)
597
598 int
nfs_setattr(struct dentry * dentry,struct iattr * attr)599 nfs_setattr(struct dentry *dentry, struct iattr *attr)
600 {
601 struct inode *inode = d_inode(dentry);
602 struct nfs_fattr *fattr;
603 int error = 0;
604
605 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
606
607 /* skip mode change if it's just for clearing setuid/setgid */
608 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
609 attr->ia_valid &= ~ATTR_MODE;
610
611 if (attr->ia_valid & ATTR_SIZE) {
612 BUG_ON(!S_ISREG(inode->i_mode));
613
614 error = inode_newsize_ok(inode, attr->ia_size);
615 if (error)
616 return error;
617
618 if (attr->ia_size == i_size_read(inode))
619 attr->ia_valid &= ~ATTR_SIZE;
620 }
621
622 /* Optimization: if the end result is no change, don't RPC */
623 attr->ia_valid &= NFS_VALID_ATTRS;
624 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
625 return 0;
626
627 trace_nfs_setattr_enter(inode);
628
629 /* Write all dirty data */
630 if (S_ISREG(inode->i_mode))
631 nfs_sync_inode(inode);
632
633 fattr = nfs_alloc_fattr();
634 if (fattr == NULL) {
635 error = -ENOMEM;
636 goto out;
637 }
638
639 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
640 if (error == 0)
641 error = nfs_refresh_inode(inode, fattr);
642 nfs_free_fattr(fattr);
643 out:
644 trace_nfs_setattr_exit(inode, error);
645 return error;
646 }
647 EXPORT_SYMBOL_GPL(nfs_setattr);
648
649 /**
650 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
651 * @inode: inode of the file used
652 * @offset: file offset to start truncating
653 *
654 * This is a copy of the common vmtruncate, but with the locking
655 * corrected to take into account the fact that NFS requires
656 * inode->i_size to be updated under the inode->i_lock.
657 * Note: must be called with inode->i_lock held!
658 */
nfs_vmtruncate(struct inode * inode,loff_t offset)659 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
660 {
661 int err;
662
663 err = inode_newsize_ok(inode, offset);
664 if (err)
665 goto out;
666
667 i_size_write(inode, offset);
668 /* Optimisation */
669 if (offset == 0)
670 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
671 NFS_INO_DATA_INVAL_DEFER);
672 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
673
674 spin_unlock(&inode->i_lock);
675 truncate_pagecache(inode, offset);
676 spin_lock(&inode->i_lock);
677 out:
678 return err;
679 }
680
681 /**
682 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
683 * @inode: pointer to struct inode
684 * @attr: pointer to struct iattr
685 * @fattr: pointer to struct nfs_fattr
686 *
687 * Note: we do this in the *proc.c in order to ensure that
688 * it works for things like exclusive creates too.
689 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)690 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
691 struct nfs_fattr *fattr)
692 {
693 /* Barrier: bump the attribute generation count. */
694 nfs_fattr_set_barrier(fattr);
695
696 spin_lock(&inode->i_lock);
697 NFS_I(inode)->attr_gencount = fattr->gencount;
698 if ((attr->ia_valid & ATTR_SIZE) != 0) {
699 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
700 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
701 nfs_vmtruncate(inode, attr->ia_size);
702 }
703 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
704 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
705 if ((attr->ia_valid & ATTR_MODE) != 0) {
706 int mode = attr->ia_mode & S_IALLUGO;
707 mode |= inode->i_mode & ~S_IALLUGO;
708 inode->i_mode = mode;
709 }
710 if ((attr->ia_valid & ATTR_UID) != 0)
711 inode->i_uid = attr->ia_uid;
712 if ((attr->ia_valid & ATTR_GID) != 0)
713 inode->i_gid = attr->ia_gid;
714 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
715 inode->i_ctime = fattr->ctime;
716 else
717 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
718 | NFS_INO_INVALID_CTIME);
719 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
720 | NFS_INO_INVALID_ACL);
721 }
722 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
723 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
724 | NFS_INO_INVALID_CTIME);
725 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
726 inode->i_atime = fattr->atime;
727 else if (attr->ia_valid & ATTR_ATIME_SET)
728 inode->i_atime = attr->ia_atime;
729 else
730 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
731
732 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
733 inode->i_ctime = fattr->ctime;
734 else
735 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
736 | NFS_INO_INVALID_CTIME);
737 }
738 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
739 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
740 | NFS_INO_INVALID_CTIME);
741 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
742 inode->i_mtime = fattr->mtime;
743 else if (attr->ia_valid & ATTR_MTIME_SET)
744 inode->i_mtime = attr->ia_mtime;
745 else
746 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
747
748 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
749 inode->i_ctime = fattr->ctime;
750 else
751 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
752 | NFS_INO_INVALID_CTIME);
753 }
754 if (fattr->valid)
755 nfs_update_inode(inode, fattr);
756 spin_unlock(&inode->i_lock);
757 }
758 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
759
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)760 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
761 {
762 struct dentry *parent;
763
764 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
765 return;
766 parent = dget_parent(dentry);
767 nfs_force_use_readdirplus(d_inode(parent));
768 dput(parent);
769 }
770
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)771 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
772 {
773 struct dentry *parent;
774
775 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
776 return;
777 parent = dget_parent(dentry);
778 nfs_advise_use_readdirplus(d_inode(parent));
779 dput(parent);
780 }
781
nfs_need_revalidate_inode(struct inode * inode)782 static bool nfs_need_revalidate_inode(struct inode *inode)
783 {
784 if (NFS_I(inode)->cache_validity &
785 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
786 return true;
787 if (nfs_attribute_cache_expired(inode))
788 return true;
789 return false;
790 }
791
nfs_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)792 int nfs_getattr(const struct path *path, struct kstat *stat,
793 u32 request_mask, unsigned int query_flags)
794 {
795 struct inode *inode = d_inode(path->dentry);
796 struct nfs_server *server = NFS_SERVER(inode);
797 unsigned long cache_validity;
798 int err = 0;
799 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
800 bool do_update = false;
801
802 trace_nfs_getattr_enter(inode);
803
804 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
805 nfs_readdirplus_parent_cache_hit(path->dentry);
806 goto out_no_update;
807 }
808
809 /* Flush out writes to the server in order to update c/mtime. */
810 if ((request_mask & (STATX_CTIME|STATX_MTIME)) &&
811 S_ISREG(inode->i_mode)) {
812 err = filemap_write_and_wait(inode->i_mapping);
813 if (err)
814 goto out;
815 }
816
817 /*
818 * We may force a getattr if the user cares about atime.
819 *
820 * Note that we only have to check the vfsmount flags here:
821 * - NFS always sets S_NOATIME by so checking it would give a
822 * bogus result
823 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
824 * no point in checking those.
825 */
826 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
827 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
828 request_mask &= ~STATX_ATIME;
829
830 /* Is the user requesting attributes that might need revalidation? */
831 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
832 STATX_MTIME|STATX_UID|STATX_GID|
833 STATX_SIZE|STATX_BLOCKS)))
834 goto out_no_revalidate;
835
836 /* Check whether the cached attributes are stale */
837 do_update |= force_sync || nfs_attribute_cache_expired(inode);
838 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
839 do_update |= cache_validity &
840 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
841 if (request_mask & STATX_ATIME)
842 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
843 if (request_mask & (STATX_CTIME|STATX_MTIME))
844 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
845 if (request_mask & STATX_BLOCKS)
846 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
847 if (do_update) {
848 /* Update the attribute cache */
849 if (!(server->flags & NFS_MOUNT_NOAC))
850 nfs_readdirplus_parent_cache_miss(path->dentry);
851 else
852 nfs_readdirplus_parent_cache_hit(path->dentry);
853 err = __nfs_revalidate_inode(server, inode);
854 if (err)
855 goto out;
856 } else
857 nfs_readdirplus_parent_cache_hit(path->dentry);
858 out_no_revalidate:
859 /* Only return attributes that were revalidated. */
860 stat->result_mask &= request_mask;
861 out_no_update:
862 generic_fillattr(inode, stat);
863 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
864 if (S_ISDIR(inode->i_mode))
865 stat->blksize = NFS_SERVER(inode)->dtsize;
866 out:
867 trace_nfs_getattr_exit(inode, err);
868 return err;
869 }
870 EXPORT_SYMBOL_GPL(nfs_getattr);
871
nfs_init_lock_context(struct nfs_lock_context * l_ctx)872 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
873 {
874 refcount_set(&l_ctx->count, 1);
875 l_ctx->lockowner = current->files;
876 INIT_LIST_HEAD(&l_ctx->list);
877 atomic_set(&l_ctx->io_count, 0);
878 }
879
__nfs_find_lock_context(struct nfs_open_context * ctx)880 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
881 {
882 struct nfs_lock_context *pos;
883
884 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
885 if (pos->lockowner != current->files)
886 continue;
887 if (refcount_inc_not_zero(&pos->count))
888 return pos;
889 }
890 return NULL;
891 }
892
nfs_get_lock_context(struct nfs_open_context * ctx)893 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
894 {
895 struct nfs_lock_context *res, *new = NULL;
896 struct inode *inode = d_inode(ctx->dentry);
897
898 rcu_read_lock();
899 res = __nfs_find_lock_context(ctx);
900 rcu_read_unlock();
901 if (res == NULL) {
902 new = kmalloc(sizeof(*new), GFP_KERNEL);
903 if (new == NULL)
904 return ERR_PTR(-ENOMEM);
905 nfs_init_lock_context(new);
906 spin_lock(&inode->i_lock);
907 res = __nfs_find_lock_context(ctx);
908 if (res == NULL) {
909 new->open_context = get_nfs_open_context(ctx);
910 if (new->open_context) {
911 list_add_tail_rcu(&new->list,
912 &ctx->lock_context.list);
913 res = new;
914 new = NULL;
915 } else
916 res = ERR_PTR(-EBADF);
917 }
918 spin_unlock(&inode->i_lock);
919 kfree(new);
920 }
921 return res;
922 }
923 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
924
nfs_put_lock_context(struct nfs_lock_context * l_ctx)925 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
926 {
927 struct nfs_open_context *ctx = l_ctx->open_context;
928 struct inode *inode = d_inode(ctx->dentry);
929
930 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
931 return;
932 list_del_rcu(&l_ctx->list);
933 spin_unlock(&inode->i_lock);
934 put_nfs_open_context(ctx);
935 kfree_rcu(l_ctx, rcu_head);
936 }
937 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
938
939 /**
940 * nfs_close_context - Common close_context() routine NFSv2/v3
941 * @ctx: pointer to context
942 * @is_sync: is this a synchronous close
943 *
944 * Ensure that the attributes are up to date if we're mounted
945 * with close-to-open semantics and we have cached data that will
946 * need to be revalidated on open.
947 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)948 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
949 {
950 struct nfs_inode *nfsi;
951 struct inode *inode;
952 struct nfs_server *server;
953
954 if (!(ctx->mode & FMODE_WRITE))
955 return;
956 if (!is_sync)
957 return;
958 inode = d_inode(ctx->dentry);
959 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
960 return;
961 nfsi = NFS_I(inode);
962 if (inode->i_mapping->nrpages == 0)
963 return;
964 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
965 return;
966 if (!list_empty(&nfsi->open_files))
967 return;
968 server = NFS_SERVER(inode);
969 if (server->flags & NFS_MOUNT_NOCTO)
970 return;
971 nfs_revalidate_inode(server, inode);
972 }
973 EXPORT_SYMBOL_GPL(nfs_close_context);
974
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)975 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
976 fmode_t f_mode,
977 struct file *filp)
978 {
979 struct nfs_open_context *ctx;
980
981 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
982 if (!ctx)
983 return ERR_PTR(-ENOMEM);
984 nfs_sb_active(dentry->d_sb);
985 ctx->dentry = dget(dentry);
986 if (filp)
987 ctx->cred = get_cred(filp->f_cred);
988 else
989 ctx->cred = get_current_cred();
990 ctx->ll_cred = NULL;
991 ctx->state = NULL;
992 ctx->mode = f_mode;
993 ctx->flags = 0;
994 ctx->error = 0;
995 ctx->flock_owner = (fl_owner_t)filp;
996 nfs_init_lock_context(&ctx->lock_context);
997 ctx->lock_context.open_context = ctx;
998 INIT_LIST_HEAD(&ctx->list);
999 ctx->mdsthreshold = NULL;
1000 return ctx;
1001 }
1002 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1003
get_nfs_open_context(struct nfs_open_context * ctx)1004 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1005 {
1006 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1007 return ctx;
1008 return NULL;
1009 }
1010 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1011
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1012 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1013 {
1014 struct inode *inode = d_inode(ctx->dentry);
1015 struct super_block *sb = ctx->dentry->d_sb;
1016
1017 if (!refcount_dec_and_test(&ctx->lock_context.count))
1018 return;
1019 if (!list_empty(&ctx->list)) {
1020 spin_lock(&inode->i_lock);
1021 list_del_rcu(&ctx->list);
1022 spin_unlock(&inode->i_lock);
1023 }
1024 if (inode != NULL)
1025 NFS_PROTO(inode)->close_context(ctx, is_sync);
1026 put_cred(ctx->cred);
1027 dput(ctx->dentry);
1028 nfs_sb_deactive(sb);
1029 put_rpccred(ctx->ll_cred);
1030 kfree(ctx->mdsthreshold);
1031 kfree_rcu(ctx, rcu_head);
1032 }
1033
put_nfs_open_context(struct nfs_open_context * ctx)1034 void put_nfs_open_context(struct nfs_open_context *ctx)
1035 {
1036 __put_nfs_open_context(ctx, 0);
1037 }
1038 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1039
put_nfs_open_context_sync(struct nfs_open_context * ctx)1040 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1041 {
1042 __put_nfs_open_context(ctx, 1);
1043 }
1044
1045 /*
1046 * Ensure that mmap has a recent RPC credential for use when writing out
1047 * shared pages
1048 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1049 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1050 {
1051 struct inode *inode = d_inode(ctx->dentry);
1052 struct nfs_inode *nfsi = NFS_I(inode);
1053
1054 spin_lock(&inode->i_lock);
1055 if (list_empty(&nfsi->open_files) &&
1056 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1057 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1058 NFS_INO_REVAL_FORCED;
1059 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1060 spin_unlock(&inode->i_lock);
1061 }
1062 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1063
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1064 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1065 {
1066 filp->private_data = get_nfs_open_context(ctx);
1067 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1068 if (list_empty(&ctx->list))
1069 nfs_inode_attach_open_context(ctx);
1070 }
1071 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1072
1073 /*
1074 * Given an inode, search for an open context with the desired characteristics
1075 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1076 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1077 {
1078 struct nfs_inode *nfsi = NFS_I(inode);
1079 struct nfs_open_context *pos, *ctx = NULL;
1080
1081 rcu_read_lock();
1082 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1083 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1084 continue;
1085 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1086 continue;
1087 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1088 continue;
1089 ctx = get_nfs_open_context(pos);
1090 if (ctx)
1091 break;
1092 }
1093 rcu_read_unlock();
1094 return ctx;
1095 }
1096
nfs_file_clear_open_context(struct file * filp)1097 void nfs_file_clear_open_context(struct file *filp)
1098 {
1099 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1100
1101 if (ctx) {
1102 struct inode *inode = d_inode(ctx->dentry);
1103
1104 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1105 /*
1106 * We fatal error on write before. Try to writeback
1107 * every page again.
1108 */
1109 if (ctx->error < 0)
1110 invalidate_inode_pages2(inode->i_mapping);
1111 filp->private_data = NULL;
1112 put_nfs_open_context_sync(ctx);
1113 }
1114 }
1115
1116 /*
1117 * These allocate and release file read/write context information.
1118 */
nfs_open(struct inode * inode,struct file * filp)1119 int nfs_open(struct inode *inode, struct file *filp)
1120 {
1121 struct nfs_open_context *ctx;
1122
1123 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1124 if (IS_ERR(ctx))
1125 return PTR_ERR(ctx);
1126 nfs_file_set_open_context(filp, ctx);
1127 put_nfs_open_context(ctx);
1128 nfs_fscache_open_file(inode, filp);
1129 return 0;
1130 }
1131 EXPORT_SYMBOL_GPL(nfs_open);
1132
1133 /*
1134 * This function is called whenever some part of NFS notices that
1135 * the cached attributes have to be refreshed.
1136 */
1137 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1138 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1139 {
1140 int status = -ESTALE;
1141 struct nfs4_label *label = NULL;
1142 struct nfs_fattr *fattr = NULL;
1143 struct nfs_inode *nfsi = NFS_I(inode);
1144
1145 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1146 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1147
1148 trace_nfs_revalidate_inode_enter(inode);
1149
1150 if (is_bad_inode(inode))
1151 goto out;
1152 if (NFS_STALE(inode))
1153 goto out;
1154
1155 /* pNFS: Attributes aren't updated until we layoutcommit */
1156 if (S_ISREG(inode->i_mode)) {
1157 status = pnfs_sync_inode(inode, false);
1158 if (status)
1159 goto out;
1160 }
1161
1162 status = -ENOMEM;
1163 fattr = nfs_alloc_fattr();
1164 if (fattr == NULL)
1165 goto out;
1166
1167 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1168
1169 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1170 if (IS_ERR(label)) {
1171 status = PTR_ERR(label);
1172 goto out;
1173 }
1174
1175 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1176 label, inode);
1177 if (status != 0) {
1178 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1179 inode->i_sb->s_id,
1180 (unsigned long long)NFS_FILEID(inode), status);
1181 switch (status) {
1182 case -ETIMEDOUT:
1183 /* A soft timeout occurred. Use cached information? */
1184 if (server->flags & NFS_MOUNT_SOFTREVAL)
1185 status = 0;
1186 break;
1187 case -ESTALE:
1188 if (!S_ISDIR(inode->i_mode))
1189 nfs_set_inode_stale(inode);
1190 else
1191 nfs_zap_caches(inode);
1192 }
1193 goto err_out;
1194 }
1195
1196 status = nfs_refresh_inode(inode, fattr);
1197 if (status) {
1198 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1199 inode->i_sb->s_id,
1200 (unsigned long long)NFS_FILEID(inode), status);
1201 goto err_out;
1202 }
1203
1204 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1205 nfs_zap_acl_cache(inode);
1206
1207 nfs_setsecurity(inode, fattr, label);
1208
1209 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1210 inode->i_sb->s_id,
1211 (unsigned long long)NFS_FILEID(inode));
1212
1213 err_out:
1214 nfs4_label_free(label);
1215 out:
1216 nfs_free_fattr(fattr);
1217 trace_nfs_revalidate_inode_exit(inode, status);
1218 return status;
1219 }
1220
nfs_attribute_cache_expired(struct inode * inode)1221 int nfs_attribute_cache_expired(struct inode *inode)
1222 {
1223 if (nfs_have_delegated_attributes(inode))
1224 return 0;
1225 return nfs_attribute_timeout(inode);
1226 }
1227
1228 /**
1229 * nfs_revalidate_inode - Revalidate the inode attributes
1230 * @server: pointer to nfs_server struct
1231 * @inode: pointer to inode struct
1232 *
1233 * Updates inode attribute information by retrieving the data from the server.
1234 */
nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1235 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1236 {
1237 if (!nfs_need_revalidate_inode(inode))
1238 return NFS_STALE(inode) ? -ESTALE : 0;
1239 return __nfs_revalidate_inode(server, inode);
1240 }
1241 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1242
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1243 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1244 {
1245 struct nfs_inode *nfsi = NFS_I(inode);
1246 int ret;
1247
1248 if (mapping->nrpages != 0) {
1249 if (S_ISREG(inode->i_mode)) {
1250 ret = nfs_sync_mapping(mapping);
1251 if (ret < 0)
1252 return ret;
1253 }
1254 ret = invalidate_inode_pages2(mapping);
1255 if (ret < 0)
1256 return ret;
1257 }
1258 if (S_ISDIR(inode->i_mode)) {
1259 spin_lock(&inode->i_lock);
1260 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1261 spin_unlock(&inode->i_lock);
1262 }
1263 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1264 nfs_fscache_wait_on_invalidate(inode);
1265
1266 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1267 inode->i_sb->s_id,
1268 (unsigned long long)NFS_FILEID(inode));
1269 return 0;
1270 }
1271
nfs_mapping_need_revalidate_inode(struct inode * inode)1272 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1273 {
1274 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1275 NFS_STALE(inode);
1276 }
1277
nfs_revalidate_mapping_rcu(struct inode * inode)1278 int nfs_revalidate_mapping_rcu(struct inode *inode)
1279 {
1280 struct nfs_inode *nfsi = NFS_I(inode);
1281 unsigned long *bitlock = &nfsi->flags;
1282 int ret = 0;
1283
1284 if (IS_SWAPFILE(inode))
1285 goto out;
1286 if (nfs_mapping_need_revalidate_inode(inode)) {
1287 ret = -ECHILD;
1288 goto out;
1289 }
1290 spin_lock(&inode->i_lock);
1291 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1292 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1293 ret = -ECHILD;
1294 spin_unlock(&inode->i_lock);
1295 out:
1296 return ret;
1297 }
1298
1299 /**
1300 * nfs_revalidate_mapping - Revalidate the pagecache
1301 * @inode: pointer to host inode
1302 * @mapping: pointer to mapping
1303 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1304 int nfs_revalidate_mapping(struct inode *inode,
1305 struct address_space *mapping)
1306 {
1307 struct nfs_inode *nfsi = NFS_I(inode);
1308 unsigned long *bitlock = &nfsi->flags;
1309 int ret = 0;
1310
1311 /* swapfiles are not supposed to be shared. */
1312 if (IS_SWAPFILE(inode))
1313 goto out;
1314
1315 if (nfs_mapping_need_revalidate_inode(inode)) {
1316 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1317 if (ret < 0)
1318 goto out;
1319 }
1320
1321 /*
1322 * We must clear NFS_INO_INVALID_DATA first to ensure that
1323 * invalidations that come in while we're shooting down the mappings
1324 * are respected. But, that leaves a race window where one revalidator
1325 * can clear the flag, and then another checks it before the mapping
1326 * gets invalidated. Fix that by serializing access to this part of
1327 * the function.
1328 *
1329 * At the same time, we need to allow other tasks to see whether we
1330 * might be in the middle of invalidating the pages, so we only set
1331 * the bit lock here if it looks like we're going to be doing that.
1332 */
1333 for (;;) {
1334 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1335 nfs_wait_bit_killable, TASK_KILLABLE);
1336 if (ret)
1337 goto out;
1338 spin_lock(&inode->i_lock);
1339 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1340 spin_unlock(&inode->i_lock);
1341 continue;
1342 }
1343 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1344 break;
1345 spin_unlock(&inode->i_lock);
1346 goto out;
1347 }
1348
1349 set_bit(NFS_INO_INVALIDATING, bitlock);
1350 smp_wmb();
1351 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1352 NFS_INO_DATA_INVAL_DEFER);
1353 spin_unlock(&inode->i_lock);
1354 trace_nfs_invalidate_mapping_enter(inode);
1355 ret = nfs_invalidate_mapping(inode, mapping);
1356 trace_nfs_invalidate_mapping_exit(inode, ret);
1357
1358 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1359 smp_mb__after_atomic();
1360 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1361 out:
1362 return ret;
1363 }
1364
nfs_file_has_writers(struct nfs_inode * nfsi)1365 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1366 {
1367 struct inode *inode = &nfsi->vfs_inode;
1368
1369 if (!S_ISREG(inode->i_mode))
1370 return false;
1371 if (list_empty(&nfsi->open_files))
1372 return false;
1373 return inode_is_open_for_write(inode);
1374 }
1375
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1376 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1377 {
1378 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1379 }
1380
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1381 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1382 {
1383 struct timespec64 ts;
1384
1385 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1386 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1387 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1388 inode_set_iversion_raw(inode, fattr->change_attr);
1389 if (S_ISDIR(inode->i_mode))
1390 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1391 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1392 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1393 }
1394 /* If we have atomic WCC data, we may update some attributes */
1395 ts = inode->i_ctime;
1396 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1397 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1398 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1399 inode->i_ctime = fattr->ctime;
1400 }
1401
1402 ts = inode->i_mtime;
1403 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1404 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1405 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1406 inode->i_mtime = fattr->mtime;
1407 if (S_ISDIR(inode->i_mode))
1408 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1409 }
1410 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1411 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1412 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1413 && !nfs_have_writebacks(inode)) {
1414 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1415 }
1416 }
1417
1418 /**
1419 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1420 * @inode: pointer to inode
1421 * @fattr: updated attributes
1422 *
1423 * Verifies the attribute cache. If we have just changed the attributes,
1424 * so that fattr carries weak cache consistency data, then it may
1425 * also update the ctime/mtime/change_attribute.
1426 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1427 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1428 {
1429 struct nfs_inode *nfsi = NFS_I(inode);
1430 loff_t cur_size, new_isize;
1431 unsigned long invalid = 0;
1432 struct timespec64 ts;
1433
1434 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1435 return 0;
1436
1437 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1438 /* Only a mounted-on-fileid? Just exit */
1439 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1440 return 0;
1441 /* Has the inode gone and changed behind our back? */
1442 } else if (nfsi->fileid != fattr->fileid) {
1443 /* Is this perhaps the mounted-on fileid? */
1444 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1445 nfsi->fileid == fattr->mounted_on_fileid)
1446 return 0;
1447 return -ESTALE;
1448 }
1449 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1450 return -ESTALE;
1451
1452
1453 if (!nfs_file_has_buffered_writers(nfsi)) {
1454 /* Verify a few of the more important attributes */
1455 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1456 invalid |= NFS_INO_INVALID_CHANGE
1457 | NFS_INO_REVAL_PAGECACHE;
1458
1459 ts = inode->i_mtime;
1460 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1461 invalid |= NFS_INO_INVALID_MTIME;
1462
1463 ts = inode->i_ctime;
1464 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1465 invalid |= NFS_INO_INVALID_CTIME;
1466
1467 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1468 cur_size = i_size_read(inode);
1469 new_isize = nfs_size_to_loff_t(fattr->size);
1470 if (cur_size != new_isize)
1471 invalid |= NFS_INO_INVALID_SIZE
1472 | NFS_INO_REVAL_PAGECACHE;
1473 }
1474 }
1475
1476 /* Have any file permissions changed? */
1477 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1478 invalid |= NFS_INO_INVALID_ACCESS
1479 | NFS_INO_INVALID_ACL
1480 | NFS_INO_INVALID_OTHER;
1481 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1482 invalid |= NFS_INO_INVALID_ACCESS
1483 | NFS_INO_INVALID_ACL
1484 | NFS_INO_INVALID_OTHER;
1485 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1486 invalid |= NFS_INO_INVALID_ACCESS
1487 | NFS_INO_INVALID_ACL
1488 | NFS_INO_INVALID_OTHER;
1489
1490 /* Has the link count changed? */
1491 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1492 invalid |= NFS_INO_INVALID_OTHER;
1493
1494 ts = inode->i_atime;
1495 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1496 invalid |= NFS_INO_INVALID_ATIME;
1497
1498 if (invalid != 0)
1499 nfs_set_cache_invalid(inode, invalid);
1500
1501 nfsi->read_cache_jiffies = fattr->time_start;
1502 return 0;
1503 }
1504
1505 static atomic_long_t nfs_attr_generation_counter;
1506
nfs_read_attr_generation_counter(void)1507 static unsigned long nfs_read_attr_generation_counter(void)
1508 {
1509 return atomic_long_read(&nfs_attr_generation_counter);
1510 }
1511
nfs_inc_attr_generation_counter(void)1512 unsigned long nfs_inc_attr_generation_counter(void)
1513 {
1514 return atomic_long_inc_return(&nfs_attr_generation_counter);
1515 }
1516 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1517
nfs_fattr_init(struct nfs_fattr * fattr)1518 void nfs_fattr_init(struct nfs_fattr *fattr)
1519 {
1520 fattr->valid = 0;
1521 fattr->time_start = jiffies;
1522 fattr->gencount = nfs_inc_attr_generation_counter();
1523 fattr->owner_name = NULL;
1524 fattr->group_name = NULL;
1525 }
1526 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1527
1528 /**
1529 * nfs_fattr_set_barrier
1530 * @fattr: attributes
1531 *
1532 * Used to set a barrier after an attribute was updated. This
1533 * barrier ensures that older attributes from RPC calls that may
1534 * have raced with our update cannot clobber these new values.
1535 * Note that you are still responsible for ensuring that other
1536 * operations which change the attribute on the server do not
1537 * collide.
1538 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1539 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1540 {
1541 fattr->gencount = nfs_inc_attr_generation_counter();
1542 }
1543
nfs_alloc_fattr(void)1544 struct nfs_fattr *nfs_alloc_fattr(void)
1545 {
1546 struct nfs_fattr *fattr;
1547
1548 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1549 if (fattr != NULL)
1550 nfs_fattr_init(fattr);
1551 return fattr;
1552 }
1553 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1554
nfs_alloc_fhandle(void)1555 struct nfs_fh *nfs_alloc_fhandle(void)
1556 {
1557 struct nfs_fh *fh;
1558
1559 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1560 if (fh != NULL)
1561 fh->size = 0;
1562 return fh;
1563 }
1564 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1565
1566 #ifdef NFS_DEBUG
1567 /*
1568 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1569 * in the same way that wireshark does
1570 *
1571 * @fh: file handle
1572 *
1573 * For debugging only.
1574 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1575 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1576 {
1577 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1578 * not on the result */
1579 return nfs_fhandle_hash(fh);
1580 }
1581 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1582
1583 /*
1584 * _nfs_display_fhandle - display an NFS file handle on the console
1585 *
1586 * @fh: file handle to display
1587 * @caption: display caption
1588 *
1589 * For debugging only.
1590 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1591 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1592 {
1593 unsigned short i;
1594
1595 if (fh == NULL || fh->size == 0) {
1596 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1597 return;
1598 }
1599
1600 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1601 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1602 for (i = 0; i < fh->size; i += 16) {
1603 __be32 *pos = (__be32 *)&fh->data[i];
1604
1605 switch ((fh->size - i - 1) >> 2) {
1606 case 0:
1607 printk(KERN_DEFAULT " %08x\n",
1608 be32_to_cpup(pos));
1609 break;
1610 case 1:
1611 printk(KERN_DEFAULT " %08x %08x\n",
1612 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1613 break;
1614 case 2:
1615 printk(KERN_DEFAULT " %08x %08x %08x\n",
1616 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1617 be32_to_cpup(pos + 2));
1618 break;
1619 default:
1620 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1621 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1622 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1623 }
1624 }
1625 }
1626 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1627 #endif
1628
1629 /**
1630 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1631 * @inode: pointer to inode
1632 * @fattr: attributes
1633 *
1634 * Attempt to divine whether or not an RPC call reply carrying stale
1635 * attributes got scheduled after another call carrying updated ones.
1636 *
1637 * To do so, the function first assumes that a more recent ctime means
1638 * that the attributes in fattr are newer, however it also attempt to
1639 * catch the case where ctime either didn't change, or went backwards
1640 * (if someone reset the clock on the server) by looking at whether
1641 * or not this RPC call was started after the inode was last updated.
1642 * Note also the check for wraparound of 'attr_gencount'
1643 *
1644 * The function returns 'true' if it thinks the attributes in 'fattr' are
1645 * more recent than the ones cached in the inode.
1646 *
1647 */
nfs_inode_attrs_need_update(const struct inode * inode,const struct nfs_fattr * fattr)1648 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1649 {
1650 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1651
1652 return (long)(fattr->gencount - attr_gencount) > 0 ||
1653 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1654 }
1655
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)1656 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1657 {
1658 int ret;
1659
1660 trace_nfs_refresh_inode_enter(inode);
1661
1662 if (nfs_inode_attrs_need_update(inode, fattr))
1663 ret = nfs_update_inode(inode, fattr);
1664 else
1665 ret = nfs_check_inode_attributes(inode, fattr);
1666
1667 trace_nfs_refresh_inode_exit(inode, ret);
1668 return ret;
1669 }
1670
1671 /**
1672 * nfs_refresh_inode - try to update the inode attribute cache
1673 * @inode: pointer to inode
1674 * @fattr: updated attributes
1675 *
1676 * Check that an RPC call that returned attributes has not overlapped with
1677 * other recent updates of the inode metadata, then decide whether it is
1678 * safe to do a full update of the inode attributes, or whether just to
1679 * call nfs_check_inode_attributes.
1680 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)1681 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1682 {
1683 int status;
1684
1685 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1686 return 0;
1687 spin_lock(&inode->i_lock);
1688 status = nfs_refresh_inode_locked(inode, fattr);
1689 spin_unlock(&inode->i_lock);
1690
1691 return status;
1692 }
1693 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1694
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)1695 static int nfs_post_op_update_inode_locked(struct inode *inode,
1696 struct nfs_fattr *fattr, unsigned int invalid)
1697 {
1698 if (S_ISDIR(inode->i_mode))
1699 invalid |= NFS_INO_INVALID_DATA;
1700 nfs_set_cache_invalid(inode, invalid);
1701 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1702 return 0;
1703 return nfs_refresh_inode_locked(inode, fattr);
1704 }
1705
1706 /**
1707 * nfs_post_op_update_inode - try to update the inode attribute cache
1708 * @inode: pointer to inode
1709 * @fattr: updated attributes
1710 *
1711 * After an operation that has changed the inode metadata, mark the
1712 * attribute cache as being invalid, then try to update it.
1713 *
1714 * NB: if the server didn't return any post op attributes, this
1715 * function will force the retrieval of attributes before the next
1716 * NFS request. Thus it should be used only for operations that
1717 * are expected to change one or more attributes, to avoid
1718 * unnecessary NFS requests and trips through nfs_update_inode().
1719 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)1720 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1721 {
1722 int status;
1723
1724 spin_lock(&inode->i_lock);
1725 nfs_fattr_set_barrier(fattr);
1726 status = nfs_post_op_update_inode_locked(inode, fattr,
1727 NFS_INO_INVALID_CHANGE
1728 | NFS_INO_INVALID_CTIME
1729 | NFS_INO_REVAL_FORCED);
1730 spin_unlock(&inode->i_lock);
1731
1732 return status;
1733 }
1734 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1735
1736 /**
1737 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1738 * @inode: pointer to inode
1739 * @fattr: updated attributes
1740 *
1741 * After an operation that has changed the inode metadata, mark the
1742 * attribute cache as being invalid, then try to update it. Fake up
1743 * weak cache consistency data, if none exist.
1744 *
1745 * This function is mainly designed to be used by the ->write_done() functions.
1746 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)1747 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1748 {
1749 int status;
1750
1751 /* Don't do a WCC update if these attributes are already stale */
1752 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1753 !nfs_inode_attrs_need_update(inode, fattr)) {
1754 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1755 | NFS_ATTR_FATTR_PRESIZE
1756 | NFS_ATTR_FATTR_PREMTIME
1757 | NFS_ATTR_FATTR_PRECTIME);
1758 goto out_noforce;
1759 }
1760 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1761 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1762 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1763 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1764 }
1765 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1766 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1767 fattr->pre_ctime = inode->i_ctime;
1768 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1769 }
1770 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1771 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1772 fattr->pre_mtime = inode->i_mtime;
1773 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1774 }
1775 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1776 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1777 fattr->pre_size = i_size_read(inode);
1778 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1779 }
1780 out_noforce:
1781 status = nfs_post_op_update_inode_locked(inode, fattr,
1782 NFS_INO_INVALID_CHANGE
1783 | NFS_INO_INVALID_CTIME
1784 | NFS_INO_INVALID_MTIME
1785 | NFS_INO_INVALID_BLOCKS);
1786 return status;
1787 }
1788
1789 /**
1790 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1791 * @inode: pointer to inode
1792 * @fattr: updated attributes
1793 *
1794 * After an operation that has changed the inode metadata, mark the
1795 * attribute cache as being invalid, then try to update it. Fake up
1796 * weak cache consistency data, if none exist.
1797 *
1798 * This function is mainly designed to be used by the ->write_done() functions.
1799 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)1800 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1801 {
1802 int status;
1803
1804 spin_lock(&inode->i_lock);
1805 nfs_fattr_set_barrier(fattr);
1806 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1807 spin_unlock(&inode->i_lock);
1808 return status;
1809 }
1810 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1811
1812
1813 /*
1814 * Many nfs protocol calls return the new file attributes after
1815 * an operation. Here we update the inode to reflect the state
1816 * of the server's inode.
1817 *
1818 * This is a bit tricky because we have to make sure all dirty pages
1819 * have been sent off to the server before calling invalidate_inode_pages.
1820 * To make sure no other process adds more write requests while we try
1821 * our best to flush them, we make them sleep during the attribute refresh.
1822 *
1823 * A very similar scenario holds for the dir cache.
1824 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)1825 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1826 {
1827 struct nfs_server *server;
1828 struct nfs_inode *nfsi = NFS_I(inode);
1829 loff_t cur_isize, new_isize;
1830 unsigned long invalid = 0;
1831 unsigned long now = jiffies;
1832 unsigned long save_cache_validity;
1833 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1834 bool cache_revalidated = true;
1835 bool attr_changed = false;
1836 bool have_delegation;
1837
1838 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1839 __func__, inode->i_sb->s_id, inode->i_ino,
1840 nfs_display_fhandle_hash(NFS_FH(inode)),
1841 atomic_read(&inode->i_count), fattr->valid);
1842
1843 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1844 /* Only a mounted-on-fileid? Just exit */
1845 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1846 return 0;
1847 /* Has the inode gone and changed behind our back? */
1848 } else if (nfsi->fileid != fattr->fileid) {
1849 /* Is this perhaps the mounted-on fileid? */
1850 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1851 nfsi->fileid == fattr->mounted_on_fileid)
1852 return 0;
1853 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1854 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1855 NFS_SERVER(inode)->nfs_client->cl_hostname,
1856 inode->i_sb->s_id, (long long)nfsi->fileid,
1857 (long long)fattr->fileid);
1858 goto out_err;
1859 }
1860
1861 /*
1862 * Make sure the inode's type hasn't changed.
1863 */
1864 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
1865 /*
1866 * Big trouble! The inode has become a different object.
1867 */
1868 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1869 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1870 goto out_err;
1871 }
1872
1873 server = NFS_SERVER(inode);
1874 /* Update the fsid? */
1875 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1876 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1877 !IS_AUTOMOUNT(inode))
1878 server->fsid = fattr->fsid;
1879
1880 /* Save the delegation state before clearing cache_validity */
1881 have_delegation = nfs_have_delegated_attributes(inode);
1882
1883 /*
1884 * Update the read time so we don't revalidate too often.
1885 */
1886 nfsi->read_cache_jiffies = fattr->time_start;
1887
1888 save_cache_validity = nfsi->cache_validity;
1889 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1890 | NFS_INO_INVALID_ATIME
1891 | NFS_INO_REVAL_FORCED
1892 | NFS_INO_REVAL_PAGECACHE
1893 | NFS_INO_INVALID_BLOCKS);
1894
1895 /* Do atomic weak cache consistency updates */
1896 nfs_wcc_update_inode(inode, fattr);
1897
1898 if (pnfs_layoutcommit_outstanding(inode)) {
1899 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1900 cache_revalidated = false;
1901 }
1902
1903 /* More cache consistency checks */
1904 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1905 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1906 /* Could it be a race with writeback? */
1907 if (!(have_writers || have_delegation)) {
1908 invalid |= NFS_INO_INVALID_DATA
1909 | NFS_INO_INVALID_ACCESS
1910 | NFS_INO_INVALID_ACL
1911 | NFS_INO_INVALID_XATTR;
1912 /* Force revalidate of all attributes */
1913 save_cache_validity |= NFS_INO_INVALID_CTIME
1914 | NFS_INO_INVALID_MTIME
1915 | NFS_INO_INVALID_SIZE
1916 | NFS_INO_INVALID_OTHER;
1917 if (S_ISDIR(inode->i_mode))
1918 nfs_force_lookup_revalidate(inode);
1919 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1920 inode->i_sb->s_id,
1921 inode->i_ino);
1922 } else if (!have_delegation)
1923 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1924 inode_set_iversion_raw(inode, fattr->change_attr);
1925 attr_changed = true;
1926 }
1927 } else {
1928 nfsi->cache_validity |= save_cache_validity &
1929 (NFS_INO_INVALID_CHANGE
1930 | NFS_INO_REVAL_PAGECACHE
1931 | NFS_INO_REVAL_FORCED);
1932 cache_revalidated = false;
1933 }
1934
1935 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1936 inode->i_mtime = fattr->mtime;
1937 } else if (server->caps & NFS_CAP_MTIME) {
1938 nfsi->cache_validity |= save_cache_validity &
1939 (NFS_INO_INVALID_MTIME
1940 | NFS_INO_REVAL_FORCED);
1941 cache_revalidated = false;
1942 }
1943
1944 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1945 inode->i_ctime = fattr->ctime;
1946 } else if (server->caps & NFS_CAP_CTIME) {
1947 nfsi->cache_validity |= save_cache_validity &
1948 (NFS_INO_INVALID_CTIME
1949 | NFS_INO_REVAL_FORCED);
1950 cache_revalidated = false;
1951 }
1952
1953 /* Check if our cached file size is stale */
1954 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1955 new_isize = nfs_size_to_loff_t(fattr->size);
1956 cur_isize = i_size_read(inode);
1957 if (new_isize != cur_isize && !have_delegation) {
1958 /* Do we perhaps have any outstanding writes, or has
1959 * the file grown beyond our last write? */
1960 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1961 i_size_write(inode, new_isize);
1962 if (!have_writers)
1963 invalid |= NFS_INO_INVALID_DATA;
1964 attr_changed = true;
1965 }
1966 dprintk("NFS: isize change on server for file %s/%ld "
1967 "(%Ld to %Ld)\n",
1968 inode->i_sb->s_id,
1969 inode->i_ino,
1970 (long long)cur_isize,
1971 (long long)new_isize);
1972 }
1973 } else {
1974 nfsi->cache_validity |= save_cache_validity &
1975 (NFS_INO_INVALID_SIZE
1976 | NFS_INO_REVAL_PAGECACHE
1977 | NFS_INO_REVAL_FORCED);
1978 cache_revalidated = false;
1979 }
1980
1981
1982 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1983 inode->i_atime = fattr->atime;
1984 else if (server->caps & NFS_CAP_ATIME) {
1985 nfsi->cache_validity |= save_cache_validity &
1986 (NFS_INO_INVALID_ATIME
1987 | NFS_INO_REVAL_FORCED);
1988 cache_revalidated = false;
1989 }
1990
1991 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1992 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1993 umode_t newmode = inode->i_mode & S_IFMT;
1994 newmode |= fattr->mode & S_IALLUGO;
1995 inode->i_mode = newmode;
1996 invalid |= NFS_INO_INVALID_ACCESS
1997 | NFS_INO_INVALID_ACL;
1998 attr_changed = true;
1999 }
2000 } else if (server->caps & NFS_CAP_MODE) {
2001 nfsi->cache_validity |= save_cache_validity &
2002 (NFS_INO_INVALID_OTHER
2003 | NFS_INO_REVAL_FORCED);
2004 cache_revalidated = false;
2005 }
2006
2007 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2008 if (!uid_eq(inode->i_uid, fattr->uid)) {
2009 invalid |= NFS_INO_INVALID_ACCESS
2010 | NFS_INO_INVALID_ACL;
2011 inode->i_uid = fattr->uid;
2012 attr_changed = true;
2013 }
2014 } else if (server->caps & NFS_CAP_OWNER) {
2015 nfsi->cache_validity |= save_cache_validity &
2016 (NFS_INO_INVALID_OTHER
2017 | NFS_INO_REVAL_FORCED);
2018 cache_revalidated = false;
2019 }
2020
2021 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2022 if (!gid_eq(inode->i_gid, fattr->gid)) {
2023 invalid |= NFS_INO_INVALID_ACCESS
2024 | NFS_INO_INVALID_ACL;
2025 inode->i_gid = fattr->gid;
2026 attr_changed = true;
2027 }
2028 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
2029 nfsi->cache_validity |= save_cache_validity &
2030 (NFS_INO_INVALID_OTHER
2031 | NFS_INO_REVAL_FORCED);
2032 cache_revalidated = false;
2033 }
2034
2035 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2036 if (inode->i_nlink != fattr->nlink) {
2037 if (S_ISDIR(inode->i_mode))
2038 invalid |= NFS_INO_INVALID_DATA;
2039 set_nlink(inode, fattr->nlink);
2040 attr_changed = true;
2041 }
2042 } else if (server->caps & NFS_CAP_NLINK) {
2043 nfsi->cache_validity |= save_cache_validity &
2044 (NFS_INO_INVALID_OTHER
2045 | NFS_INO_REVAL_FORCED);
2046 cache_revalidated = false;
2047 }
2048
2049 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2050 /*
2051 * report the blocks in 512byte units
2052 */
2053 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2054 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2055 inode->i_blocks = fattr->du.nfs2.blocks;
2056 else {
2057 nfsi->cache_validity |= save_cache_validity &
2058 (NFS_INO_INVALID_BLOCKS
2059 | NFS_INO_REVAL_FORCED);
2060 cache_revalidated = false;
2061 }
2062
2063 /* Update attrtimeo value if we're out of the unstable period */
2064 if (attr_changed) {
2065 invalid &= ~NFS_INO_INVALID_ATTR;
2066 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2067 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2068 nfsi->attrtimeo_timestamp = now;
2069 /* Set barrier to be more recent than all outstanding updates */
2070 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2071 } else {
2072 if (cache_revalidated) {
2073 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2074 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2075 nfsi->attrtimeo <<= 1;
2076 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2077 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2078 }
2079 nfsi->attrtimeo_timestamp = now;
2080 }
2081 /* Set the barrier to be more recent than this fattr */
2082 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2083 nfsi->attr_gencount = fattr->gencount;
2084 }
2085
2086 /* Don't invalidate the data if we were to blame */
2087 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2088 || S_ISLNK(inode->i_mode)))
2089 invalid &= ~NFS_INO_INVALID_DATA;
2090 nfs_set_cache_invalid(inode, invalid);
2091
2092 return 0;
2093 out_err:
2094 /*
2095 * No need to worry about unhashing the dentry, as the
2096 * lookup validation will know that the inode is bad.
2097 * (But we fall through to invalidate the caches.)
2098 */
2099 nfs_set_inode_stale_locked(inode);
2100 return -ESTALE;
2101 }
2102
nfs_alloc_inode(struct super_block * sb)2103 struct inode *nfs_alloc_inode(struct super_block *sb)
2104 {
2105 struct nfs_inode *nfsi;
2106 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2107 if (!nfsi)
2108 return NULL;
2109 nfsi->flags = 0UL;
2110 nfsi->cache_validity = 0UL;
2111 #if IS_ENABLED(CONFIG_NFS_V4)
2112 nfsi->nfs4_acl = NULL;
2113 #endif /* CONFIG_NFS_V4 */
2114 #ifdef CONFIG_NFS_V4_2
2115 nfsi->xattr_cache = NULL;
2116 #endif
2117 return &nfsi->vfs_inode;
2118 }
2119 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2120
nfs_free_inode(struct inode * inode)2121 void nfs_free_inode(struct inode *inode)
2122 {
2123 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2124 }
2125 EXPORT_SYMBOL_GPL(nfs_free_inode);
2126
nfs4_init_once(struct nfs_inode * nfsi)2127 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2128 {
2129 #if IS_ENABLED(CONFIG_NFS_V4)
2130 INIT_LIST_HEAD(&nfsi->open_states);
2131 nfsi->delegation = NULL;
2132 init_rwsem(&nfsi->rwsem);
2133 nfsi->layout = NULL;
2134 #endif
2135 }
2136
init_once(void * foo)2137 static void init_once(void *foo)
2138 {
2139 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2140
2141 inode_init_once(&nfsi->vfs_inode);
2142 INIT_LIST_HEAD(&nfsi->open_files);
2143 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2144 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2145 INIT_LIST_HEAD(&nfsi->commit_info.list);
2146 atomic_long_set(&nfsi->nrequests, 0);
2147 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2148 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2149 init_rwsem(&nfsi->rmdir_sem);
2150 mutex_init(&nfsi->commit_mutex);
2151 nfs4_init_once(nfsi);
2152 nfsi->cache_change_attribute = 0;
2153 }
2154
nfs_init_inodecache(void)2155 static int __init nfs_init_inodecache(void)
2156 {
2157 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2158 sizeof(struct nfs_inode),
2159 0, (SLAB_RECLAIM_ACCOUNT|
2160 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2161 init_once);
2162 if (nfs_inode_cachep == NULL)
2163 return -ENOMEM;
2164
2165 return 0;
2166 }
2167
nfs_destroy_inodecache(void)2168 static void nfs_destroy_inodecache(void)
2169 {
2170 /*
2171 * Make sure all delayed rcu free inodes are flushed before we
2172 * destroy cache.
2173 */
2174 rcu_barrier();
2175 kmem_cache_destroy(nfs_inode_cachep);
2176 }
2177
2178 struct workqueue_struct *nfsiod_workqueue;
2179 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2180
2181 /*
2182 * start up the nfsiod workqueue
2183 */
nfsiod_start(void)2184 static int nfsiod_start(void)
2185 {
2186 struct workqueue_struct *wq;
2187 dprintk("RPC: creating workqueue nfsiod\n");
2188 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2189 if (wq == NULL)
2190 return -ENOMEM;
2191 nfsiod_workqueue = wq;
2192 return 0;
2193 }
2194
2195 /*
2196 * Destroy the nfsiod workqueue
2197 */
nfsiod_stop(void)2198 static void nfsiod_stop(void)
2199 {
2200 struct workqueue_struct *wq;
2201
2202 wq = nfsiod_workqueue;
2203 if (wq == NULL)
2204 return;
2205 nfsiod_workqueue = NULL;
2206 destroy_workqueue(wq);
2207 }
2208
2209 unsigned int nfs_net_id;
2210 EXPORT_SYMBOL_GPL(nfs_net_id);
2211
nfs_net_init(struct net * net)2212 static int nfs_net_init(struct net *net)
2213 {
2214 nfs_clients_init(net);
2215 return nfs_fs_proc_net_init(net);
2216 }
2217
nfs_net_exit(struct net * net)2218 static void nfs_net_exit(struct net *net)
2219 {
2220 nfs_fs_proc_net_exit(net);
2221 nfs_clients_exit(net);
2222 }
2223
2224 static struct pernet_operations nfs_net_ops = {
2225 .init = nfs_net_init,
2226 .exit = nfs_net_exit,
2227 .id = &nfs_net_id,
2228 .size = sizeof(struct nfs_net),
2229 };
2230
2231 /*
2232 * Initialize NFS
2233 */
init_nfs_fs(void)2234 static int __init init_nfs_fs(void)
2235 {
2236 int err;
2237
2238 err = nfs_sysfs_init();
2239 if (err < 0)
2240 goto out10;
2241
2242 err = register_pernet_subsys(&nfs_net_ops);
2243 if (err < 0)
2244 goto out9;
2245
2246 err = nfs_fscache_register();
2247 if (err < 0)
2248 goto out8;
2249
2250 err = nfsiod_start();
2251 if (err)
2252 goto out7;
2253
2254 err = nfs_fs_proc_init();
2255 if (err)
2256 goto out6;
2257
2258 err = nfs_init_nfspagecache();
2259 if (err)
2260 goto out5;
2261
2262 err = nfs_init_inodecache();
2263 if (err)
2264 goto out4;
2265
2266 err = nfs_init_readpagecache();
2267 if (err)
2268 goto out3;
2269
2270 err = nfs_init_writepagecache();
2271 if (err)
2272 goto out2;
2273
2274 err = nfs_init_directcache();
2275 if (err)
2276 goto out1;
2277
2278 rpc_proc_register(&init_net, &nfs_rpcstat);
2279
2280 err = register_nfs_fs();
2281 if (err)
2282 goto out0;
2283
2284 return 0;
2285 out0:
2286 rpc_proc_unregister(&init_net, "nfs");
2287 nfs_destroy_directcache();
2288 out1:
2289 nfs_destroy_writepagecache();
2290 out2:
2291 nfs_destroy_readpagecache();
2292 out3:
2293 nfs_destroy_inodecache();
2294 out4:
2295 nfs_destroy_nfspagecache();
2296 out5:
2297 nfs_fs_proc_exit();
2298 out6:
2299 nfsiod_stop();
2300 out7:
2301 nfs_fscache_unregister();
2302 out8:
2303 unregister_pernet_subsys(&nfs_net_ops);
2304 out9:
2305 nfs_sysfs_exit();
2306 out10:
2307 return err;
2308 }
2309
exit_nfs_fs(void)2310 static void __exit exit_nfs_fs(void)
2311 {
2312 nfs_destroy_directcache();
2313 nfs_destroy_writepagecache();
2314 nfs_destroy_readpagecache();
2315 nfs_destroy_inodecache();
2316 nfs_destroy_nfspagecache();
2317 nfs_fscache_unregister();
2318 unregister_pernet_subsys(&nfs_net_ops);
2319 rpc_proc_unregister(&init_net, "nfs");
2320 unregister_nfs_fs();
2321 nfs_fs_proc_exit();
2322 nfsiod_stop();
2323 nfs_sysfs_exit();
2324 }
2325
2326 /* Not quite true; I just maintain it */
2327 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2328 MODULE_LICENSE("GPL");
2329 module_param(enable_ino64, bool, 0644);
2330
2331 module_init(init_nfs_fs)
2332 module_exit(exit_nfs_fs)
2333