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
198 #ifdef CONFIG_NFS_V4_2
nfs_has_xattr_cache(const struct nfs_inode * nfsi)199 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
200 {
201 return nfsi->xattr_cache != NULL;
202 }
203 #else
nfs_has_xattr_cache(const struct nfs_inode * nfsi)204 static bool nfs_has_xattr_cache(const struct nfs_inode *nfsi)
205 {
206 return false;
207 }
208 #endif
209
nfs_set_cache_invalid(struct inode * inode,unsigned long flags)210 static void nfs_set_cache_invalid(struct inode *inode, unsigned long flags)
211 {
212 struct nfs_inode *nfsi = NFS_I(inode);
213 bool have_delegation = NFS_PROTO(inode)->have_delegation(inode, FMODE_READ);
214
215 if (have_delegation) {
216 if (!(flags & NFS_INO_REVAL_FORCED))
217 flags &= ~NFS_INO_INVALID_OTHER;
218 flags &= ~(NFS_INO_INVALID_CHANGE
219 | NFS_INO_INVALID_SIZE
220 | NFS_INO_REVAL_PAGECACHE
221 | NFS_INO_INVALID_XATTR);
222 } else if (flags & NFS_INO_REVAL_PAGECACHE)
223 flags |= NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_SIZE;
224
225 if (!nfs_has_xattr_cache(nfsi))
226 flags &= ~NFS_INO_INVALID_XATTR;
227 if (inode->i_mapping->nrpages == 0)
228 flags &= ~(NFS_INO_INVALID_DATA|NFS_INO_DATA_INVAL_DEFER);
229 nfsi->cache_validity |= flags;
230 if (flags & NFS_INO_INVALID_DATA)
231 nfs_fscache_invalidate(inode);
232 }
233
234 /*
235 * Invalidate the local caches
236 */
nfs_zap_caches_locked(struct inode * inode)237 static void nfs_zap_caches_locked(struct inode *inode)
238 {
239 struct nfs_inode *nfsi = NFS_I(inode);
240 int mode = inode->i_mode;
241
242 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
243
244 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
245 nfsi->attrtimeo_timestamp = jiffies;
246
247 memset(NFS_I(inode)->cookieverf, 0, sizeof(NFS_I(inode)->cookieverf));
248 if (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)) {
249 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
250 | NFS_INO_INVALID_DATA
251 | NFS_INO_INVALID_ACCESS
252 | NFS_INO_INVALID_ACL
253 | NFS_INO_INVALID_XATTR
254 | NFS_INO_REVAL_PAGECACHE);
255 } else
256 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATTR
257 | NFS_INO_INVALID_ACCESS
258 | NFS_INO_INVALID_ACL
259 | NFS_INO_INVALID_XATTR
260 | NFS_INO_REVAL_PAGECACHE);
261 nfs_zap_label_cache_locked(nfsi);
262 }
263
nfs_zap_caches(struct inode * inode)264 void nfs_zap_caches(struct inode *inode)
265 {
266 spin_lock(&inode->i_lock);
267 nfs_zap_caches_locked(inode);
268 spin_unlock(&inode->i_lock);
269 }
270
nfs_zap_mapping(struct inode * inode,struct address_space * mapping)271 void nfs_zap_mapping(struct inode *inode, struct address_space *mapping)
272 {
273 if (mapping->nrpages != 0) {
274 spin_lock(&inode->i_lock);
275 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
276 spin_unlock(&inode->i_lock);
277 }
278 }
279
nfs_zap_acl_cache(struct inode * inode)280 void nfs_zap_acl_cache(struct inode *inode)
281 {
282 void (*clear_acl_cache)(struct inode *);
283
284 clear_acl_cache = NFS_PROTO(inode)->clear_acl_cache;
285 if (clear_acl_cache != NULL)
286 clear_acl_cache(inode);
287 spin_lock(&inode->i_lock);
288 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_ACL;
289 spin_unlock(&inode->i_lock);
290 }
291 EXPORT_SYMBOL_GPL(nfs_zap_acl_cache);
292
nfs_invalidate_atime(struct inode * inode)293 void nfs_invalidate_atime(struct inode *inode)
294 {
295 spin_lock(&inode->i_lock);
296 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
297 spin_unlock(&inode->i_lock);
298 }
299 EXPORT_SYMBOL_GPL(nfs_invalidate_atime);
300
301 /*
302 * Invalidate, but do not unhash, the inode.
303 * NB: must be called with inode->i_lock held!
304 */
nfs_set_inode_stale_locked(struct inode * inode)305 static void nfs_set_inode_stale_locked(struct inode *inode)
306 {
307 set_bit(NFS_INO_STALE, &NFS_I(inode)->flags);
308 nfs_zap_caches_locked(inode);
309 trace_nfs_set_inode_stale(inode);
310 }
311
nfs_set_inode_stale(struct inode * inode)312 void nfs_set_inode_stale(struct inode *inode)
313 {
314 spin_lock(&inode->i_lock);
315 nfs_set_inode_stale_locked(inode);
316 spin_unlock(&inode->i_lock);
317 }
318
319 struct nfs_find_desc {
320 struct nfs_fh *fh;
321 struct nfs_fattr *fattr;
322 };
323
324 /*
325 * In NFSv3 we can have 64bit inode numbers. In order to support
326 * this, and re-exported directories (also seen in NFSv2)
327 * we are forced to allow 2 different inodes to have the same
328 * i_ino.
329 */
330 static int
nfs_find_actor(struct inode * inode,void * opaque)331 nfs_find_actor(struct inode *inode, void *opaque)
332 {
333 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
334 struct nfs_fh *fh = desc->fh;
335 struct nfs_fattr *fattr = desc->fattr;
336
337 if (NFS_FILEID(inode) != fattr->fileid)
338 return 0;
339 if (inode_wrong_type(inode, fattr->mode))
340 return 0;
341 if (nfs_compare_fh(NFS_FH(inode), fh))
342 return 0;
343 if (is_bad_inode(inode) || NFS_STALE(inode))
344 return 0;
345 return 1;
346 }
347
348 static int
nfs_init_locked(struct inode * inode,void * opaque)349 nfs_init_locked(struct inode *inode, void *opaque)
350 {
351 struct nfs_find_desc *desc = (struct nfs_find_desc *)opaque;
352 struct nfs_fattr *fattr = desc->fattr;
353
354 set_nfs_fileid(inode, fattr->fileid);
355 inode->i_mode = fattr->mode;
356 nfs_copy_fh(NFS_FH(inode), desc->fh);
357 return 0;
358 }
359
360 #ifdef CONFIG_NFS_V4_SECURITY_LABEL
nfs_clear_label_invalid(struct inode * inode)361 static void nfs_clear_label_invalid(struct inode *inode)
362 {
363 spin_lock(&inode->i_lock);
364 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_LABEL;
365 spin_unlock(&inode->i_lock);
366 }
367
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr,struct nfs4_label * label)368 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
369 struct nfs4_label *label)
370 {
371 int error;
372
373 if (label == NULL)
374 return;
375
376 if ((fattr->valid & NFS_ATTR_FATTR_V4_SECURITY_LABEL) && inode->i_security) {
377 error = security_inode_notifysecctx(inode, label->label,
378 label->len);
379 if (error)
380 printk(KERN_ERR "%s() %s %d "
381 "security_inode_notifysecctx() %d\n",
382 __func__,
383 (char *)label->label,
384 label->len, error);
385 nfs_clear_label_invalid(inode);
386 }
387 }
388
nfs4_label_alloc(struct nfs_server * server,gfp_t flags)389 struct nfs4_label *nfs4_label_alloc(struct nfs_server *server, gfp_t flags)
390 {
391 struct nfs4_label *label = NULL;
392 int minor_version = server->nfs_client->cl_minorversion;
393
394 if (minor_version < 2)
395 return label;
396
397 if (!(server->caps & NFS_CAP_SECURITY_LABEL))
398 return label;
399
400 label = kzalloc(sizeof(struct nfs4_label), flags);
401 if (label == NULL)
402 return ERR_PTR(-ENOMEM);
403
404 label->label = kzalloc(NFS4_MAXLABELLEN, flags);
405 if (label->label == NULL) {
406 kfree(label);
407 return ERR_PTR(-ENOMEM);
408 }
409 label->len = NFS4_MAXLABELLEN;
410
411 return label;
412 }
413 EXPORT_SYMBOL_GPL(nfs4_label_alloc);
414 #else
nfs_setsecurity(struct inode * inode,struct nfs_fattr * fattr,struct nfs4_label * label)415 void nfs_setsecurity(struct inode *inode, struct nfs_fattr *fattr,
416 struct nfs4_label *label)
417 {
418 }
419 #endif
420 EXPORT_SYMBOL_GPL(nfs_setsecurity);
421
422 /* Search for inode identified by fh, fileid and i_mode in inode cache. */
423 struct inode *
nfs_ilookup(struct super_block * sb,struct nfs_fattr * fattr,struct nfs_fh * fh)424 nfs_ilookup(struct super_block *sb, struct nfs_fattr *fattr, struct nfs_fh *fh)
425 {
426 struct nfs_find_desc desc = {
427 .fh = fh,
428 .fattr = fattr,
429 };
430 struct inode *inode;
431 unsigned long hash;
432
433 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID) ||
434 !(fattr->valid & NFS_ATTR_FATTR_TYPE))
435 return NULL;
436
437 hash = nfs_fattr_to_ino_t(fattr);
438 inode = ilookup5(sb, hash, nfs_find_actor, &desc);
439
440 dprintk("%s: returning %p\n", __func__, inode);
441 return inode;
442 }
443
444 /*
445 * This is our front-end to iget that looks up inodes by file handle
446 * instead of inode number.
447 */
448 struct inode *
nfs_fhget(struct super_block * sb,struct nfs_fh * fh,struct nfs_fattr * fattr,struct nfs4_label * label)449 nfs_fhget(struct super_block *sb, struct nfs_fh *fh, struct nfs_fattr *fattr, struct nfs4_label *label)
450 {
451 struct nfs_find_desc desc = {
452 .fh = fh,
453 .fattr = fattr
454 };
455 struct inode *inode = ERR_PTR(-ENOENT);
456 unsigned long hash;
457
458 nfs_attr_check_mountpoint(sb, fattr);
459
460 if (nfs_attr_use_mounted_on_fileid(fattr))
461 fattr->fileid = fattr->mounted_on_fileid;
462 else if ((fattr->valid & NFS_ATTR_FATTR_FILEID) == 0)
463 goto out_no_inode;
464 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) == 0)
465 goto out_no_inode;
466
467 hash = nfs_fattr_to_ino_t(fattr);
468
469 inode = iget5_locked(sb, hash, nfs_find_actor, nfs_init_locked, &desc);
470 if (inode == NULL) {
471 inode = ERR_PTR(-ENOMEM);
472 goto out_no_inode;
473 }
474
475 if (inode->i_state & I_NEW) {
476 struct nfs_inode *nfsi = NFS_I(inode);
477 unsigned long now = jiffies;
478
479 /* We set i_ino for the few things that still rely on it,
480 * such as stat(2) */
481 inode->i_ino = hash;
482
483 /* We can't support update_atime(), since the server will reset it */
484 inode->i_flags |= S_NOATIME|S_NOCMTIME;
485 inode->i_mode = fattr->mode;
486 nfsi->cache_validity = 0;
487 if ((fattr->valid & NFS_ATTR_FATTR_MODE) == 0
488 && nfs_server_capable(inode, NFS_CAP_MODE))
489 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
490 /* Why so? Because we want revalidate for devices/FIFOs, and
491 * that's precisely what we have in nfs_file_inode_operations.
492 */
493 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->file_inode_ops;
494 if (S_ISREG(inode->i_mode)) {
495 inode->i_fop = NFS_SB(sb)->nfs_client->rpc_ops->file_ops;
496 inode->i_data.a_ops = &nfs_file_aops;
497 } else if (S_ISDIR(inode->i_mode)) {
498 inode->i_op = NFS_SB(sb)->nfs_client->rpc_ops->dir_inode_ops;
499 inode->i_fop = &nfs_dir_operations;
500 inode->i_data.a_ops = &nfs_dir_aops;
501 /* Deal with crossing mountpoints */
502 if (fattr->valid & NFS_ATTR_FATTR_MOUNTPOINT ||
503 fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL) {
504 if (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)
505 inode->i_op = &nfs_referral_inode_operations;
506 else
507 inode->i_op = &nfs_mountpoint_inode_operations;
508 inode->i_fop = NULL;
509 inode->i_flags |= S_AUTOMOUNT;
510 }
511 } else if (S_ISLNK(inode->i_mode)) {
512 inode->i_op = &nfs_symlink_inode_operations;
513 inode_nohighmem(inode);
514 } else
515 init_special_inode(inode, inode->i_mode, fattr->rdev);
516
517 memset(&inode->i_atime, 0, sizeof(inode->i_atime));
518 memset(&inode->i_mtime, 0, sizeof(inode->i_mtime));
519 memset(&inode->i_ctime, 0, sizeof(inode->i_ctime));
520 inode_set_iversion_raw(inode, 0);
521 inode->i_size = 0;
522 clear_nlink(inode);
523 inode->i_uid = make_kuid(&init_user_ns, -2);
524 inode->i_gid = make_kgid(&init_user_ns, -2);
525 inode->i_blocks = 0;
526 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
527 nfsi->write_io = 0;
528 nfsi->read_io = 0;
529
530 nfsi->read_cache_jiffies = fattr->time_start;
531 nfsi->attr_gencount = fattr->gencount;
532 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
533 inode->i_atime = fattr->atime;
534 else if (nfs_server_capable(inode, NFS_CAP_ATIME))
535 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
536 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
537 inode->i_mtime = fattr->mtime;
538 else if (nfs_server_capable(inode, NFS_CAP_MTIME))
539 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
540 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
541 inode->i_ctime = fattr->ctime;
542 else if (nfs_server_capable(inode, NFS_CAP_CTIME))
543 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CTIME);
544 if (fattr->valid & NFS_ATTR_FATTR_CHANGE)
545 inode_set_iversion_raw(inode, fattr->change_attr);
546 else
547 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE);
548 if (fattr->valid & NFS_ATTR_FATTR_SIZE)
549 inode->i_size = nfs_size_to_loff_t(fattr->size);
550 else
551 nfs_set_cache_invalid(inode, NFS_INO_INVALID_SIZE);
552 if (fattr->valid & NFS_ATTR_FATTR_NLINK)
553 set_nlink(inode, fattr->nlink);
554 else if (nfs_server_capable(inode, NFS_CAP_NLINK))
555 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
556 if (fattr->valid & NFS_ATTR_FATTR_OWNER)
557 inode->i_uid = fattr->uid;
558 else if (nfs_server_capable(inode, NFS_CAP_OWNER))
559 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
560 if (fattr->valid & NFS_ATTR_FATTR_GROUP)
561 inode->i_gid = fattr->gid;
562 else if (nfs_server_capable(inode, NFS_CAP_OWNER_GROUP))
563 nfs_set_cache_invalid(inode, NFS_INO_INVALID_OTHER);
564 if (nfs_server_capable(inode, NFS_CAP_XATTR))
565 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
566 if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
567 inode->i_blocks = fattr->du.nfs2.blocks;
568 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
569 /*
570 * report the blocks in 512byte units
571 */
572 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
573 }
574
575 if (nfsi->cache_validity != 0)
576 nfsi->cache_validity |= NFS_INO_REVAL_FORCED;
577
578 nfs_setsecurity(inode, fattr, label);
579
580 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
581 nfsi->attrtimeo_timestamp = now;
582 nfsi->access_cache = RB_ROOT;
583
584 nfs_fscache_init_inode(inode);
585
586 unlock_new_inode(inode);
587 } else {
588 int err = nfs_refresh_inode(inode, fattr);
589 if (err < 0) {
590 iput(inode);
591 inode = ERR_PTR(err);
592 goto out_no_inode;
593 }
594 }
595 dprintk("NFS: nfs_fhget(%s/%Lu fh_crc=0x%08x ct=%d)\n",
596 inode->i_sb->s_id,
597 (unsigned long long)NFS_FILEID(inode),
598 nfs_display_fhandle_hash(fh),
599 atomic_read(&inode->i_count));
600
601 out:
602 return inode;
603
604 out_no_inode:
605 dprintk("nfs_fhget: iget failed with error %ld\n", PTR_ERR(inode));
606 goto out;
607 }
608 EXPORT_SYMBOL_GPL(nfs_fhget);
609
610 #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)
611
612 int
nfs_setattr(struct dentry * dentry,struct iattr * attr)613 nfs_setattr(struct dentry *dentry, struct iattr *attr)
614 {
615 struct inode *inode = d_inode(dentry);
616 struct nfs_fattr *fattr;
617 int error = 0;
618
619 nfs_inc_stats(inode, NFSIOS_VFSSETATTR);
620
621 /* skip mode change if it's just for clearing setuid/setgid */
622 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID))
623 attr->ia_valid &= ~ATTR_MODE;
624
625 if (attr->ia_valid & ATTR_SIZE) {
626 BUG_ON(!S_ISREG(inode->i_mode));
627
628 error = inode_newsize_ok(inode, attr->ia_size);
629 if (error)
630 return error;
631
632 if (attr->ia_size == i_size_read(inode))
633 attr->ia_valid &= ~ATTR_SIZE;
634 }
635
636 /* Optimization: if the end result is no change, don't RPC */
637 attr->ia_valid &= NFS_VALID_ATTRS;
638 if ((attr->ia_valid & ~(ATTR_FILE|ATTR_OPEN)) == 0)
639 return 0;
640
641 trace_nfs_setattr_enter(inode);
642
643 /* Write all dirty data */
644 if (S_ISREG(inode->i_mode))
645 nfs_sync_inode(inode);
646
647 fattr = nfs_alloc_fattr();
648 if (fattr == NULL) {
649 error = -ENOMEM;
650 goto out;
651 }
652
653 error = NFS_PROTO(inode)->setattr(dentry, fattr, attr);
654 if (error == 0)
655 error = nfs_refresh_inode(inode, fattr);
656 nfs_free_fattr(fattr);
657 out:
658 trace_nfs_setattr_exit(inode, error);
659 return error;
660 }
661 EXPORT_SYMBOL_GPL(nfs_setattr);
662
663 /**
664 * nfs_vmtruncate - unmap mappings "freed" by truncate() syscall
665 * @inode: inode of the file used
666 * @offset: file offset to start truncating
667 *
668 * This is a copy of the common vmtruncate, but with the locking
669 * corrected to take into account the fact that NFS requires
670 * inode->i_size to be updated under the inode->i_lock.
671 * Note: must be called with inode->i_lock held!
672 */
nfs_vmtruncate(struct inode * inode,loff_t offset)673 static int nfs_vmtruncate(struct inode * inode, loff_t offset)
674 {
675 int err;
676
677 err = inode_newsize_ok(inode, offset);
678 if (err)
679 goto out;
680
681 i_size_write(inode, offset);
682 /* Optimisation */
683 if (offset == 0)
684 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_DATA |
685 NFS_INO_DATA_INVAL_DEFER);
686 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_SIZE;
687
688 spin_unlock(&inode->i_lock);
689 truncate_pagecache(inode, offset);
690 spin_lock(&inode->i_lock);
691 out:
692 return err;
693 }
694
695 /**
696 * nfs_setattr_update_inode - Update inode metadata after a setattr call.
697 * @inode: pointer to struct inode
698 * @attr: pointer to struct iattr
699 * @fattr: pointer to struct nfs_fattr
700 *
701 * Note: we do this in the *proc.c in order to ensure that
702 * it works for things like exclusive creates too.
703 */
nfs_setattr_update_inode(struct inode * inode,struct iattr * attr,struct nfs_fattr * fattr)704 void nfs_setattr_update_inode(struct inode *inode, struct iattr *attr,
705 struct nfs_fattr *fattr)
706 {
707 /* Barrier: bump the attribute generation count. */
708 nfs_fattr_set_barrier(fattr);
709
710 spin_lock(&inode->i_lock);
711 NFS_I(inode)->attr_gencount = fattr->gencount;
712 if ((attr->ia_valid & ATTR_SIZE) != 0) {
713 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
714 nfs_inc_stats(inode, NFSIOS_SETATTRTRUNC);
715 nfs_vmtruncate(inode, attr->ia_size);
716 }
717 if ((attr->ia_valid & (ATTR_MODE|ATTR_UID|ATTR_GID)) != 0) {
718 NFS_I(inode)->cache_validity &= ~NFS_INO_INVALID_CTIME;
719 if ((attr->ia_valid & ATTR_MODE) != 0) {
720 int mode = attr->ia_mode & S_IALLUGO;
721 mode |= inode->i_mode & ~S_IALLUGO;
722 inode->i_mode = mode;
723 }
724 if ((attr->ia_valid & ATTR_UID) != 0)
725 inode->i_uid = attr->ia_uid;
726 if ((attr->ia_valid & ATTR_GID) != 0)
727 inode->i_gid = attr->ia_gid;
728 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
729 inode->i_ctime = fattr->ctime;
730 else
731 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
732 | NFS_INO_INVALID_CTIME);
733 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ACCESS
734 | NFS_INO_INVALID_ACL);
735 }
736 if (attr->ia_valid & (ATTR_ATIME_SET|ATTR_ATIME)) {
737 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_ATIME
738 | NFS_INO_INVALID_CTIME);
739 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
740 inode->i_atime = fattr->atime;
741 else if (attr->ia_valid & ATTR_ATIME_SET)
742 inode->i_atime = attr->ia_atime;
743 else
744 nfs_set_cache_invalid(inode, NFS_INO_INVALID_ATIME);
745
746 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
747 inode->i_ctime = fattr->ctime;
748 else
749 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
750 | NFS_INO_INVALID_CTIME);
751 }
752 if (attr->ia_valid & (ATTR_MTIME_SET|ATTR_MTIME)) {
753 NFS_I(inode)->cache_validity &= ~(NFS_INO_INVALID_MTIME
754 | NFS_INO_INVALID_CTIME);
755 if (fattr->valid & NFS_ATTR_FATTR_MTIME)
756 inode->i_mtime = fattr->mtime;
757 else if (attr->ia_valid & ATTR_MTIME_SET)
758 inode->i_mtime = attr->ia_mtime;
759 else
760 nfs_set_cache_invalid(inode, NFS_INO_INVALID_MTIME);
761
762 if (fattr->valid & NFS_ATTR_FATTR_CTIME)
763 inode->i_ctime = fattr->ctime;
764 else
765 nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE
766 | NFS_INO_INVALID_CTIME);
767 }
768 if (fattr->valid)
769 nfs_update_inode(inode, fattr);
770 spin_unlock(&inode->i_lock);
771 }
772 EXPORT_SYMBOL_GPL(nfs_setattr_update_inode);
773
nfs_readdirplus_parent_cache_miss(struct dentry * dentry)774 static void nfs_readdirplus_parent_cache_miss(struct dentry *dentry)
775 {
776 struct dentry *parent;
777
778 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
779 return;
780 parent = dget_parent(dentry);
781 nfs_force_use_readdirplus(d_inode(parent));
782 dput(parent);
783 }
784
nfs_readdirplus_parent_cache_hit(struct dentry * dentry)785 static void nfs_readdirplus_parent_cache_hit(struct dentry *dentry)
786 {
787 struct dentry *parent;
788
789 if (!nfs_server_capable(d_inode(dentry), NFS_CAP_READDIRPLUS))
790 return;
791 parent = dget_parent(dentry);
792 nfs_advise_use_readdirplus(d_inode(parent));
793 dput(parent);
794 }
795
nfs_need_revalidate_inode(struct inode * inode)796 static bool nfs_need_revalidate_inode(struct inode *inode)
797 {
798 if (NFS_I(inode)->cache_validity &
799 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL))
800 return true;
801 if (nfs_attribute_cache_expired(inode))
802 return true;
803 return false;
804 }
805
nfs_getattr(const struct path * path,struct kstat * stat,u32 request_mask,unsigned int query_flags)806 int nfs_getattr(const struct path *path, struct kstat *stat,
807 u32 request_mask, unsigned int query_flags)
808 {
809 struct inode *inode = d_inode(path->dentry);
810 struct nfs_server *server = NFS_SERVER(inode);
811 unsigned long cache_validity;
812 int err = 0;
813 bool force_sync = query_flags & AT_STATX_FORCE_SYNC;
814 bool do_update = false;
815
816 trace_nfs_getattr_enter(inode);
817
818 if ((query_flags & AT_STATX_DONT_SYNC) && !force_sync) {
819 nfs_readdirplus_parent_cache_hit(path->dentry);
820 goto out_no_update;
821 }
822
823 /* Flush out writes to the server in order to update c/mtime. */
824 if ((request_mask & (STATX_CTIME | STATX_MTIME)) &&
825 S_ISREG(inode->i_mode))
826 filemap_write_and_wait(inode->i_mapping);
827
828 /*
829 * We may force a getattr if the user cares about atime.
830 *
831 * Note that we only have to check the vfsmount flags here:
832 * - NFS always sets S_NOATIME by so checking it would give a
833 * bogus result
834 * - NFS never sets SB_NOATIME or SB_NODIRATIME so there is
835 * no point in checking those.
836 */
837 if ((path->mnt->mnt_flags & MNT_NOATIME) ||
838 ((path->mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
839 request_mask &= ~STATX_ATIME;
840
841 /* Is the user requesting attributes that might need revalidation? */
842 if (!(request_mask & (STATX_MODE|STATX_NLINK|STATX_ATIME|STATX_CTIME|
843 STATX_MTIME|STATX_UID|STATX_GID|
844 STATX_SIZE|STATX_BLOCKS)))
845 goto out_no_revalidate;
846
847 /* Check whether the cached attributes are stale */
848 do_update |= force_sync || nfs_attribute_cache_expired(inode);
849 cache_validity = READ_ONCE(NFS_I(inode)->cache_validity);
850 do_update |= cache_validity &
851 (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_LABEL);
852 if (request_mask & STATX_ATIME)
853 do_update |= cache_validity & NFS_INO_INVALID_ATIME;
854 if (request_mask & (STATX_CTIME|STATX_MTIME))
855 do_update |= cache_validity & NFS_INO_REVAL_PAGECACHE;
856 if (request_mask & STATX_BLOCKS)
857 do_update |= cache_validity & NFS_INO_INVALID_BLOCKS;
858 if (do_update) {
859 /* Update the attribute cache */
860 if (!(server->flags & NFS_MOUNT_NOAC))
861 nfs_readdirplus_parent_cache_miss(path->dentry);
862 else
863 nfs_readdirplus_parent_cache_hit(path->dentry);
864 err = __nfs_revalidate_inode(server, inode);
865 if (err)
866 goto out;
867 } else
868 nfs_readdirplus_parent_cache_hit(path->dentry);
869 out_no_revalidate:
870 /* Only return attributes that were revalidated. */
871 stat->result_mask &= request_mask;
872 out_no_update:
873 generic_fillattr(inode, stat);
874 stat->ino = nfs_compat_user_ino64(NFS_FILEID(inode));
875 if (S_ISDIR(inode->i_mode))
876 stat->blksize = NFS_SERVER(inode)->dtsize;
877 out:
878 trace_nfs_getattr_exit(inode, err);
879 return err;
880 }
881 EXPORT_SYMBOL_GPL(nfs_getattr);
882
nfs_init_lock_context(struct nfs_lock_context * l_ctx)883 static void nfs_init_lock_context(struct nfs_lock_context *l_ctx)
884 {
885 refcount_set(&l_ctx->count, 1);
886 l_ctx->lockowner = current->files;
887 INIT_LIST_HEAD(&l_ctx->list);
888 atomic_set(&l_ctx->io_count, 0);
889 }
890
__nfs_find_lock_context(struct nfs_open_context * ctx)891 static struct nfs_lock_context *__nfs_find_lock_context(struct nfs_open_context *ctx)
892 {
893 struct nfs_lock_context *pos;
894
895 list_for_each_entry_rcu(pos, &ctx->lock_context.list, list) {
896 if (pos->lockowner != current->files)
897 continue;
898 if (refcount_inc_not_zero(&pos->count))
899 return pos;
900 }
901 return NULL;
902 }
903
nfs_get_lock_context(struct nfs_open_context * ctx)904 struct nfs_lock_context *nfs_get_lock_context(struct nfs_open_context *ctx)
905 {
906 struct nfs_lock_context *res, *new = NULL;
907 struct inode *inode = d_inode(ctx->dentry);
908
909 rcu_read_lock();
910 res = __nfs_find_lock_context(ctx);
911 rcu_read_unlock();
912 if (res == NULL) {
913 new = kmalloc(sizeof(*new), GFP_KERNEL);
914 if (new == NULL)
915 return ERR_PTR(-ENOMEM);
916 nfs_init_lock_context(new);
917 spin_lock(&inode->i_lock);
918 res = __nfs_find_lock_context(ctx);
919 if (res == NULL) {
920 new->open_context = get_nfs_open_context(ctx);
921 if (new->open_context) {
922 list_add_tail_rcu(&new->list,
923 &ctx->lock_context.list);
924 res = new;
925 new = NULL;
926 } else
927 res = ERR_PTR(-EBADF);
928 }
929 spin_unlock(&inode->i_lock);
930 kfree(new);
931 }
932 return res;
933 }
934 EXPORT_SYMBOL_GPL(nfs_get_lock_context);
935
nfs_put_lock_context(struct nfs_lock_context * l_ctx)936 void nfs_put_lock_context(struct nfs_lock_context *l_ctx)
937 {
938 struct nfs_open_context *ctx = l_ctx->open_context;
939 struct inode *inode = d_inode(ctx->dentry);
940
941 if (!refcount_dec_and_lock(&l_ctx->count, &inode->i_lock))
942 return;
943 list_del_rcu(&l_ctx->list);
944 spin_unlock(&inode->i_lock);
945 put_nfs_open_context(ctx);
946 kfree_rcu(l_ctx, rcu_head);
947 }
948 EXPORT_SYMBOL_GPL(nfs_put_lock_context);
949
950 /**
951 * nfs_close_context - Common close_context() routine NFSv2/v3
952 * @ctx: pointer to context
953 * @is_sync: is this a synchronous close
954 *
955 * Ensure that the attributes are up to date if we're mounted
956 * with close-to-open semantics and we have cached data that will
957 * need to be revalidated on open.
958 */
nfs_close_context(struct nfs_open_context * ctx,int is_sync)959 void nfs_close_context(struct nfs_open_context *ctx, int is_sync)
960 {
961 struct nfs_inode *nfsi;
962 struct inode *inode;
963 struct nfs_server *server;
964
965 if (!(ctx->mode & FMODE_WRITE))
966 return;
967 if (!is_sync)
968 return;
969 inode = d_inode(ctx->dentry);
970 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
971 return;
972 nfsi = NFS_I(inode);
973 if (inode->i_mapping->nrpages == 0)
974 return;
975 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
976 return;
977 if (!list_empty(&nfsi->open_files))
978 return;
979 server = NFS_SERVER(inode);
980 if (server->flags & NFS_MOUNT_NOCTO)
981 return;
982 nfs_revalidate_inode(server, inode);
983 }
984 EXPORT_SYMBOL_GPL(nfs_close_context);
985
alloc_nfs_open_context(struct dentry * dentry,fmode_t f_mode,struct file * filp)986 struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
987 fmode_t f_mode,
988 struct file *filp)
989 {
990 struct nfs_open_context *ctx;
991
992 ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
993 if (!ctx)
994 return ERR_PTR(-ENOMEM);
995 nfs_sb_active(dentry->d_sb);
996 ctx->dentry = dget(dentry);
997 if (filp)
998 ctx->cred = get_cred(filp->f_cred);
999 else
1000 ctx->cred = get_current_cred();
1001 ctx->ll_cred = NULL;
1002 ctx->state = NULL;
1003 ctx->mode = f_mode;
1004 ctx->flags = 0;
1005 ctx->error = 0;
1006 ctx->flock_owner = (fl_owner_t)filp;
1007 nfs_init_lock_context(&ctx->lock_context);
1008 ctx->lock_context.open_context = ctx;
1009 INIT_LIST_HEAD(&ctx->list);
1010 ctx->mdsthreshold = NULL;
1011 return ctx;
1012 }
1013 EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
1014
get_nfs_open_context(struct nfs_open_context * ctx)1015 struct nfs_open_context *get_nfs_open_context(struct nfs_open_context *ctx)
1016 {
1017 if (ctx != NULL && refcount_inc_not_zero(&ctx->lock_context.count))
1018 return ctx;
1019 return NULL;
1020 }
1021 EXPORT_SYMBOL_GPL(get_nfs_open_context);
1022
__put_nfs_open_context(struct nfs_open_context * ctx,int is_sync)1023 static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
1024 {
1025 struct inode *inode = d_inode(ctx->dentry);
1026 struct super_block *sb = ctx->dentry->d_sb;
1027
1028 if (!refcount_dec_and_test(&ctx->lock_context.count))
1029 return;
1030 if (!list_empty(&ctx->list)) {
1031 spin_lock(&inode->i_lock);
1032 list_del_rcu(&ctx->list);
1033 spin_unlock(&inode->i_lock);
1034 }
1035 if (inode != NULL)
1036 NFS_PROTO(inode)->close_context(ctx, is_sync);
1037 put_cred(ctx->cred);
1038 dput(ctx->dentry);
1039 nfs_sb_deactive(sb);
1040 put_rpccred(ctx->ll_cred);
1041 kfree(ctx->mdsthreshold);
1042 kfree_rcu(ctx, rcu_head);
1043 }
1044
put_nfs_open_context(struct nfs_open_context * ctx)1045 void put_nfs_open_context(struct nfs_open_context *ctx)
1046 {
1047 __put_nfs_open_context(ctx, 0);
1048 }
1049 EXPORT_SYMBOL_GPL(put_nfs_open_context);
1050
put_nfs_open_context_sync(struct nfs_open_context * ctx)1051 static void put_nfs_open_context_sync(struct nfs_open_context *ctx)
1052 {
1053 __put_nfs_open_context(ctx, 1);
1054 }
1055
1056 /*
1057 * Ensure that mmap has a recent RPC credential for use when writing out
1058 * shared pages
1059 */
nfs_inode_attach_open_context(struct nfs_open_context * ctx)1060 void nfs_inode_attach_open_context(struct nfs_open_context *ctx)
1061 {
1062 struct inode *inode = d_inode(ctx->dentry);
1063 struct nfs_inode *nfsi = NFS_I(inode);
1064
1065 spin_lock(&inode->i_lock);
1066 if (list_empty(&nfsi->open_files) &&
1067 (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER))
1068 nfsi->cache_validity |= NFS_INO_INVALID_DATA |
1069 NFS_INO_REVAL_FORCED;
1070 list_add_tail_rcu(&ctx->list, &nfsi->open_files);
1071 spin_unlock(&inode->i_lock);
1072 }
1073 EXPORT_SYMBOL_GPL(nfs_inode_attach_open_context);
1074
nfs_file_set_open_context(struct file * filp,struct nfs_open_context * ctx)1075 void nfs_file_set_open_context(struct file *filp, struct nfs_open_context *ctx)
1076 {
1077 filp->private_data = get_nfs_open_context(ctx);
1078 set_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1079 if (list_empty(&ctx->list))
1080 nfs_inode_attach_open_context(ctx);
1081 }
1082 EXPORT_SYMBOL_GPL(nfs_file_set_open_context);
1083
1084 /*
1085 * Given an inode, search for an open context with the desired characteristics
1086 */
nfs_find_open_context(struct inode * inode,const struct cred * cred,fmode_t mode)1087 struct nfs_open_context *nfs_find_open_context(struct inode *inode, const struct cred *cred, fmode_t mode)
1088 {
1089 struct nfs_inode *nfsi = NFS_I(inode);
1090 struct nfs_open_context *pos, *ctx = NULL;
1091
1092 rcu_read_lock();
1093 list_for_each_entry_rcu(pos, &nfsi->open_files, list) {
1094 if (cred != NULL && cred_fscmp(pos->cred, cred) != 0)
1095 continue;
1096 if ((pos->mode & (FMODE_READ|FMODE_WRITE)) != mode)
1097 continue;
1098 if (!test_bit(NFS_CONTEXT_FILE_OPEN, &pos->flags))
1099 continue;
1100 ctx = get_nfs_open_context(pos);
1101 if (ctx)
1102 break;
1103 }
1104 rcu_read_unlock();
1105 return ctx;
1106 }
1107
nfs_file_clear_open_context(struct file * filp)1108 void nfs_file_clear_open_context(struct file *filp)
1109 {
1110 struct nfs_open_context *ctx = nfs_file_open_context(filp);
1111
1112 if (ctx) {
1113 struct inode *inode = d_inode(ctx->dentry);
1114
1115 clear_bit(NFS_CONTEXT_FILE_OPEN, &ctx->flags);
1116 /*
1117 * We fatal error on write before. Try to writeback
1118 * every page again.
1119 */
1120 if (ctx->error < 0)
1121 invalidate_inode_pages2(inode->i_mapping);
1122 filp->private_data = NULL;
1123 put_nfs_open_context_sync(ctx);
1124 }
1125 }
1126
1127 /*
1128 * These allocate and release file read/write context information.
1129 */
nfs_open(struct inode * inode,struct file * filp)1130 int nfs_open(struct inode *inode, struct file *filp)
1131 {
1132 struct nfs_open_context *ctx;
1133
1134 ctx = alloc_nfs_open_context(file_dentry(filp), filp->f_mode, filp);
1135 if (IS_ERR(ctx))
1136 return PTR_ERR(ctx);
1137 nfs_file_set_open_context(filp, ctx);
1138 put_nfs_open_context(ctx);
1139 nfs_fscache_open_file(inode, filp);
1140 return 0;
1141 }
1142
1143 /*
1144 * This function is called whenever some part of NFS notices that
1145 * the cached attributes have to be refreshed.
1146 */
1147 int
__nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1148 __nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1149 {
1150 int status = -ESTALE;
1151 struct nfs4_label *label = NULL;
1152 struct nfs_fattr *fattr = NULL;
1153 struct nfs_inode *nfsi = NFS_I(inode);
1154
1155 dfprintk(PAGECACHE, "NFS: revalidating (%s/%Lu)\n",
1156 inode->i_sb->s_id, (unsigned long long)NFS_FILEID(inode));
1157
1158 trace_nfs_revalidate_inode_enter(inode);
1159
1160 if (is_bad_inode(inode))
1161 goto out;
1162 if (NFS_STALE(inode))
1163 goto out;
1164
1165 /* pNFS: Attributes aren't updated until we layoutcommit */
1166 if (S_ISREG(inode->i_mode)) {
1167 status = pnfs_sync_inode(inode, false);
1168 if (status)
1169 goto out;
1170 }
1171
1172 status = -ENOMEM;
1173 fattr = nfs_alloc_fattr();
1174 if (fattr == NULL)
1175 goto out;
1176
1177 nfs_inc_stats(inode, NFSIOS_INODEREVALIDATE);
1178
1179 label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL);
1180 if (IS_ERR(label)) {
1181 status = PTR_ERR(label);
1182 goto out;
1183 }
1184
1185 status = NFS_PROTO(inode)->getattr(server, NFS_FH(inode), fattr,
1186 label, inode);
1187 if (status != 0) {
1188 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) getattr failed, error=%d\n",
1189 inode->i_sb->s_id,
1190 (unsigned long long)NFS_FILEID(inode), status);
1191 switch (status) {
1192 case -ETIMEDOUT:
1193 /* A soft timeout occurred. Use cached information? */
1194 if (server->flags & NFS_MOUNT_SOFTREVAL)
1195 status = 0;
1196 break;
1197 case -ESTALE:
1198 if (!S_ISDIR(inode->i_mode))
1199 nfs_set_inode_stale(inode);
1200 else
1201 nfs_zap_caches(inode);
1202 }
1203 goto err_out;
1204 }
1205
1206 status = nfs_refresh_inode(inode, fattr);
1207 if (status) {
1208 dfprintk(PAGECACHE, "nfs_revalidate_inode: (%s/%Lu) refresh failed, error=%d\n",
1209 inode->i_sb->s_id,
1210 (unsigned long long)NFS_FILEID(inode), status);
1211 goto err_out;
1212 }
1213
1214 if (nfsi->cache_validity & NFS_INO_INVALID_ACL)
1215 nfs_zap_acl_cache(inode);
1216
1217 nfs_setsecurity(inode, fattr, label);
1218
1219 dfprintk(PAGECACHE, "NFS: (%s/%Lu) revalidation complete\n",
1220 inode->i_sb->s_id,
1221 (unsigned long long)NFS_FILEID(inode));
1222
1223 err_out:
1224 nfs4_label_free(label);
1225 out:
1226 nfs_free_fattr(fattr);
1227 trace_nfs_revalidate_inode_exit(inode, status);
1228 return status;
1229 }
1230
nfs_attribute_cache_expired(struct inode * inode)1231 int nfs_attribute_cache_expired(struct inode *inode)
1232 {
1233 if (nfs_have_delegated_attributes(inode))
1234 return 0;
1235 return nfs_attribute_timeout(inode);
1236 }
1237
1238 /**
1239 * nfs_revalidate_inode - Revalidate the inode attributes
1240 * @server: pointer to nfs_server struct
1241 * @inode: pointer to inode struct
1242 *
1243 * Updates inode attribute information by retrieving the data from the server.
1244 */
nfs_revalidate_inode(struct nfs_server * server,struct inode * inode)1245 int nfs_revalidate_inode(struct nfs_server *server, struct inode *inode)
1246 {
1247 if (!nfs_need_revalidate_inode(inode))
1248 return NFS_STALE(inode) ? -ESTALE : 0;
1249 return __nfs_revalidate_inode(server, inode);
1250 }
1251 EXPORT_SYMBOL_GPL(nfs_revalidate_inode);
1252
nfs_invalidate_mapping(struct inode * inode,struct address_space * mapping)1253 static int nfs_invalidate_mapping(struct inode *inode, struct address_space *mapping)
1254 {
1255 struct nfs_inode *nfsi = NFS_I(inode);
1256 int ret;
1257
1258 if (mapping->nrpages != 0) {
1259 if (S_ISREG(inode->i_mode)) {
1260 ret = nfs_sync_mapping(mapping);
1261 if (ret < 0)
1262 return ret;
1263 }
1264 ret = invalidate_inode_pages2(mapping);
1265 if (ret < 0)
1266 return ret;
1267 }
1268 if (S_ISDIR(inode->i_mode)) {
1269 spin_lock(&inode->i_lock);
1270 memset(nfsi->cookieverf, 0, sizeof(nfsi->cookieverf));
1271 spin_unlock(&inode->i_lock);
1272 }
1273 nfs_inc_stats(inode, NFSIOS_DATAINVALIDATE);
1274 nfs_fscache_wait_on_invalidate(inode);
1275
1276 dfprintk(PAGECACHE, "NFS: (%s/%Lu) data cache invalidated\n",
1277 inode->i_sb->s_id,
1278 (unsigned long long)NFS_FILEID(inode));
1279 return 0;
1280 }
1281
nfs_mapping_need_revalidate_inode(struct inode * inode)1282 bool nfs_mapping_need_revalidate_inode(struct inode *inode)
1283 {
1284 return nfs_check_cache_invalid(inode, NFS_INO_REVAL_PAGECACHE) ||
1285 NFS_STALE(inode);
1286 }
1287
nfs_revalidate_mapping_rcu(struct inode * inode)1288 int nfs_revalidate_mapping_rcu(struct inode *inode)
1289 {
1290 struct nfs_inode *nfsi = NFS_I(inode);
1291 unsigned long *bitlock = &nfsi->flags;
1292 int ret = 0;
1293
1294 if (IS_SWAPFILE(inode))
1295 goto out;
1296 if (nfs_mapping_need_revalidate_inode(inode)) {
1297 ret = -ECHILD;
1298 goto out;
1299 }
1300 spin_lock(&inode->i_lock);
1301 if (test_bit(NFS_INO_INVALIDATING, bitlock) ||
1302 (nfsi->cache_validity & NFS_INO_INVALID_DATA))
1303 ret = -ECHILD;
1304 spin_unlock(&inode->i_lock);
1305 out:
1306 return ret;
1307 }
1308
1309 /**
1310 * nfs_revalidate_mapping - Revalidate the pagecache
1311 * @inode: pointer to host inode
1312 * @mapping: pointer to mapping
1313 */
nfs_revalidate_mapping(struct inode * inode,struct address_space * mapping)1314 int nfs_revalidate_mapping(struct inode *inode,
1315 struct address_space *mapping)
1316 {
1317 struct nfs_inode *nfsi = NFS_I(inode);
1318 unsigned long *bitlock = &nfsi->flags;
1319 int ret = 0;
1320
1321 /* swapfiles are not supposed to be shared. */
1322 if (IS_SWAPFILE(inode))
1323 goto out;
1324
1325 if (nfs_mapping_need_revalidate_inode(inode)) {
1326 ret = __nfs_revalidate_inode(NFS_SERVER(inode), inode);
1327 if (ret < 0)
1328 goto out;
1329 }
1330
1331 /*
1332 * We must clear NFS_INO_INVALID_DATA first to ensure that
1333 * invalidations that come in while we're shooting down the mappings
1334 * are respected. But, that leaves a race window where one revalidator
1335 * can clear the flag, and then another checks it before the mapping
1336 * gets invalidated. Fix that by serializing access to this part of
1337 * the function.
1338 *
1339 * At the same time, we need to allow other tasks to see whether we
1340 * might be in the middle of invalidating the pages, so we only set
1341 * the bit lock here if it looks like we're going to be doing that.
1342 */
1343 for (;;) {
1344 ret = wait_on_bit_action(bitlock, NFS_INO_INVALIDATING,
1345 nfs_wait_bit_killable, TASK_KILLABLE);
1346 if (ret)
1347 goto out;
1348 spin_lock(&inode->i_lock);
1349 if (test_bit(NFS_INO_INVALIDATING, bitlock)) {
1350 spin_unlock(&inode->i_lock);
1351 continue;
1352 }
1353 if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
1354 break;
1355 spin_unlock(&inode->i_lock);
1356 goto out;
1357 }
1358
1359 set_bit(NFS_INO_INVALIDATING, bitlock);
1360 smp_wmb();
1361 nfsi->cache_validity &= ~(NFS_INO_INVALID_DATA|
1362 NFS_INO_DATA_INVAL_DEFER);
1363 spin_unlock(&inode->i_lock);
1364 trace_nfs_invalidate_mapping_enter(inode);
1365 ret = nfs_invalidate_mapping(inode, mapping);
1366 trace_nfs_invalidate_mapping_exit(inode, ret);
1367
1368 clear_bit_unlock(NFS_INO_INVALIDATING, bitlock);
1369 smp_mb__after_atomic();
1370 wake_up_bit(bitlock, NFS_INO_INVALIDATING);
1371 out:
1372 return ret;
1373 }
1374
nfs_file_has_writers(struct nfs_inode * nfsi)1375 static bool nfs_file_has_writers(struct nfs_inode *nfsi)
1376 {
1377 struct inode *inode = &nfsi->vfs_inode;
1378
1379 if (!S_ISREG(inode->i_mode))
1380 return false;
1381 if (list_empty(&nfsi->open_files))
1382 return false;
1383 return inode_is_open_for_write(inode);
1384 }
1385
nfs_file_has_buffered_writers(struct nfs_inode * nfsi)1386 static bool nfs_file_has_buffered_writers(struct nfs_inode *nfsi)
1387 {
1388 return nfs_file_has_writers(nfsi) && nfs_file_io_is_buffered(nfsi);
1389 }
1390
nfs_wcc_update_inode(struct inode * inode,struct nfs_fattr * fattr)1391 static void nfs_wcc_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1392 {
1393 struct timespec64 ts;
1394
1395 if ((fattr->valid & NFS_ATTR_FATTR_PRECHANGE)
1396 && (fattr->valid & NFS_ATTR_FATTR_CHANGE)
1397 && inode_eq_iversion_raw(inode, fattr->pre_change_attr)) {
1398 inode_set_iversion_raw(inode, fattr->change_attr);
1399 if (S_ISDIR(inode->i_mode))
1400 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1401 else if (nfs_server_capable(inode, NFS_CAP_XATTR))
1402 nfs_set_cache_invalid(inode, NFS_INO_INVALID_XATTR);
1403 }
1404 /* If we have atomic WCC data, we may update some attributes */
1405 ts = inode->i_ctime;
1406 if ((fattr->valid & NFS_ATTR_FATTR_PRECTIME)
1407 && (fattr->valid & NFS_ATTR_FATTR_CTIME)
1408 && timespec64_equal(&ts, &fattr->pre_ctime)) {
1409 inode->i_ctime = fattr->ctime;
1410 }
1411
1412 ts = inode->i_mtime;
1413 if ((fattr->valid & NFS_ATTR_FATTR_PREMTIME)
1414 && (fattr->valid & NFS_ATTR_FATTR_MTIME)
1415 && timespec64_equal(&ts, &fattr->pre_mtime)) {
1416 inode->i_mtime = fattr->mtime;
1417 if (S_ISDIR(inode->i_mode))
1418 nfs_set_cache_invalid(inode, NFS_INO_INVALID_DATA);
1419 }
1420 if ((fattr->valid & NFS_ATTR_FATTR_PRESIZE)
1421 && (fattr->valid & NFS_ATTR_FATTR_SIZE)
1422 && i_size_read(inode) == nfs_size_to_loff_t(fattr->pre_size)
1423 && !nfs_have_writebacks(inode)) {
1424 i_size_write(inode, nfs_size_to_loff_t(fattr->size));
1425 }
1426 }
1427
1428 /**
1429 * nfs_check_inode_attributes - verify consistency of the inode attribute cache
1430 * @inode: pointer to inode
1431 * @fattr: updated attributes
1432 *
1433 * Verifies the attribute cache. If we have just changed the attributes,
1434 * so that fattr carries weak cache consistency data, then it may
1435 * also update the ctime/mtime/change_attribute.
1436 */
nfs_check_inode_attributes(struct inode * inode,struct nfs_fattr * fattr)1437 static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fattr)
1438 {
1439 struct nfs_inode *nfsi = NFS_I(inode);
1440 loff_t cur_size, new_isize;
1441 unsigned long invalid = 0;
1442 struct timespec64 ts;
1443
1444 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1445 return 0;
1446
1447 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1448 /* Only a mounted-on-fileid? Just exit */
1449 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1450 return 0;
1451 /* Has the inode gone and changed behind our back? */
1452 } else if (nfsi->fileid != fattr->fileid) {
1453 /* Is this perhaps the mounted-on fileid? */
1454 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1455 nfsi->fileid == fattr->mounted_on_fileid)
1456 return 0;
1457 return -ESTALE;
1458 }
1459 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode))
1460 return -ESTALE;
1461
1462
1463 if (!nfs_file_has_buffered_writers(nfsi)) {
1464 /* Verify a few of the more important attributes */
1465 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && !inode_eq_iversion_raw(inode, fattr->change_attr))
1466 invalid |= NFS_INO_INVALID_CHANGE
1467 | NFS_INO_REVAL_PAGECACHE;
1468
1469 ts = inode->i_mtime;
1470 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) && !timespec64_equal(&ts, &fattr->mtime))
1471 invalid |= NFS_INO_INVALID_MTIME;
1472
1473 ts = inode->i_ctime;
1474 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) && !timespec64_equal(&ts, &fattr->ctime))
1475 invalid |= NFS_INO_INVALID_CTIME;
1476
1477 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1478 cur_size = i_size_read(inode);
1479 new_isize = nfs_size_to_loff_t(fattr->size);
1480 if (cur_size != new_isize)
1481 invalid |= NFS_INO_INVALID_SIZE
1482 | NFS_INO_REVAL_PAGECACHE;
1483 }
1484 }
1485
1486 /* Have any file permissions changed? */
1487 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1488 invalid |= NFS_INO_INVALID_ACCESS
1489 | NFS_INO_INVALID_ACL
1490 | NFS_INO_INVALID_OTHER;
1491 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1492 invalid |= NFS_INO_INVALID_ACCESS
1493 | NFS_INO_INVALID_ACL
1494 | NFS_INO_INVALID_OTHER;
1495 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1496 invalid |= NFS_INO_INVALID_ACCESS
1497 | NFS_INO_INVALID_ACL
1498 | NFS_INO_INVALID_OTHER;
1499
1500 /* Has the link count changed? */
1501 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1502 invalid |= NFS_INO_INVALID_OTHER;
1503
1504 ts = inode->i_atime;
1505 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec64_equal(&ts, &fattr->atime))
1506 invalid |= NFS_INO_INVALID_ATIME;
1507
1508 if (invalid != 0)
1509 nfs_set_cache_invalid(inode, invalid);
1510
1511 nfsi->read_cache_jiffies = fattr->time_start;
1512 return 0;
1513 }
1514
1515 static atomic_long_t nfs_attr_generation_counter;
1516
nfs_read_attr_generation_counter(void)1517 static unsigned long nfs_read_attr_generation_counter(void)
1518 {
1519 return atomic_long_read(&nfs_attr_generation_counter);
1520 }
1521
nfs_inc_attr_generation_counter(void)1522 unsigned long nfs_inc_attr_generation_counter(void)
1523 {
1524 return atomic_long_inc_return(&nfs_attr_generation_counter);
1525 }
1526 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1527
nfs_fattr_init(struct nfs_fattr * fattr)1528 void nfs_fattr_init(struct nfs_fattr *fattr)
1529 {
1530 fattr->valid = 0;
1531 fattr->time_start = jiffies;
1532 fattr->gencount = nfs_inc_attr_generation_counter();
1533 fattr->owner_name = NULL;
1534 fattr->group_name = NULL;
1535 }
1536 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1537
1538 /**
1539 * nfs_fattr_set_barrier
1540 * @fattr: attributes
1541 *
1542 * Used to set a barrier after an attribute was updated. This
1543 * barrier ensures that older attributes from RPC calls that may
1544 * have raced with our update cannot clobber these new values.
1545 * Note that you are still responsible for ensuring that other
1546 * operations which change the attribute on the server do not
1547 * collide.
1548 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1549 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1550 {
1551 fattr->gencount = nfs_inc_attr_generation_counter();
1552 }
1553
nfs_alloc_fattr(void)1554 struct nfs_fattr *nfs_alloc_fattr(void)
1555 {
1556 struct nfs_fattr *fattr;
1557
1558 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1559 if (fattr != NULL)
1560 nfs_fattr_init(fattr);
1561 return fattr;
1562 }
1563 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1564
nfs_alloc_fhandle(void)1565 struct nfs_fh *nfs_alloc_fhandle(void)
1566 {
1567 struct nfs_fh *fh;
1568
1569 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1570 if (fh != NULL)
1571 fh->size = 0;
1572 return fh;
1573 }
1574 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1575
1576 #ifdef NFS_DEBUG
1577 /*
1578 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1579 * in the same way that wireshark does
1580 *
1581 * @fh: file handle
1582 *
1583 * For debugging only.
1584 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1585 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1586 {
1587 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1588 * not on the result */
1589 return nfs_fhandle_hash(fh);
1590 }
1591 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1592
1593 /*
1594 * _nfs_display_fhandle - display an NFS file handle on the console
1595 *
1596 * @fh: file handle to display
1597 * @caption: display caption
1598 *
1599 * For debugging only.
1600 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1601 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1602 {
1603 unsigned short i;
1604
1605 if (fh == NULL || fh->size == 0) {
1606 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1607 return;
1608 }
1609
1610 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1611 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1612 for (i = 0; i < fh->size; i += 16) {
1613 __be32 *pos = (__be32 *)&fh->data[i];
1614
1615 switch ((fh->size - i - 1) >> 2) {
1616 case 0:
1617 printk(KERN_DEFAULT " %08x\n",
1618 be32_to_cpup(pos));
1619 break;
1620 case 1:
1621 printk(KERN_DEFAULT " %08x %08x\n",
1622 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1623 break;
1624 case 2:
1625 printk(KERN_DEFAULT " %08x %08x %08x\n",
1626 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1627 be32_to_cpup(pos + 2));
1628 break;
1629 default:
1630 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1631 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1632 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1633 }
1634 }
1635 }
1636 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1637 #endif
1638
1639 /**
1640 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1641 * @inode: pointer to inode
1642 * @fattr: attributes
1643 *
1644 * Attempt to divine whether or not an RPC call reply carrying stale
1645 * attributes got scheduled after another call carrying updated ones.
1646 *
1647 * To do so, the function first assumes that a more recent ctime means
1648 * that the attributes in fattr are newer, however it also attempt to
1649 * catch the case where ctime either didn't change, or went backwards
1650 * (if someone reset the clock on the server) by looking at whether
1651 * or not this RPC call was started after the inode was last updated.
1652 * Note also the check for wraparound of 'attr_gencount'
1653 *
1654 * The function returns 'true' if it thinks the attributes in 'fattr' are
1655 * more recent than the ones cached in the inode.
1656 *
1657 */
nfs_inode_attrs_need_update(const struct inode * inode,const struct nfs_fattr * fattr)1658 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1659 {
1660 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1661
1662 return (long)(fattr->gencount - attr_gencount) > 0 ||
1663 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1664 }
1665
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)1666 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1667 {
1668 int ret;
1669
1670 trace_nfs_refresh_inode_enter(inode);
1671
1672 if (nfs_inode_attrs_need_update(inode, fattr))
1673 ret = nfs_update_inode(inode, fattr);
1674 else
1675 ret = nfs_check_inode_attributes(inode, fattr);
1676
1677 trace_nfs_refresh_inode_exit(inode, ret);
1678 return ret;
1679 }
1680
1681 /**
1682 * nfs_refresh_inode - try to update the inode attribute cache
1683 * @inode: pointer to inode
1684 * @fattr: updated attributes
1685 *
1686 * Check that an RPC call that returned attributes has not overlapped with
1687 * other recent updates of the inode metadata, then decide whether it is
1688 * safe to do a full update of the inode attributes, or whether just to
1689 * call nfs_check_inode_attributes.
1690 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)1691 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1692 {
1693 int status;
1694
1695 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1696 return 0;
1697 spin_lock(&inode->i_lock);
1698 status = nfs_refresh_inode_locked(inode, fattr);
1699 spin_unlock(&inode->i_lock);
1700
1701 return status;
1702 }
1703 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1704
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)1705 static int nfs_post_op_update_inode_locked(struct inode *inode,
1706 struct nfs_fattr *fattr, unsigned int invalid)
1707 {
1708 if (S_ISDIR(inode->i_mode))
1709 invalid |= NFS_INO_INVALID_DATA;
1710 nfs_set_cache_invalid(inode, invalid);
1711 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1712 return 0;
1713 return nfs_refresh_inode_locked(inode, fattr);
1714 }
1715
1716 /**
1717 * nfs_post_op_update_inode - try to update the inode attribute cache
1718 * @inode: pointer to inode
1719 * @fattr: updated attributes
1720 *
1721 * After an operation that has changed the inode metadata, mark the
1722 * attribute cache as being invalid, then try to update it.
1723 *
1724 * NB: if the server didn't return any post op attributes, this
1725 * function will force the retrieval of attributes before the next
1726 * NFS request. Thus it should be used only for operations that
1727 * are expected to change one or more attributes, to avoid
1728 * unnecessary NFS requests and trips through nfs_update_inode().
1729 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)1730 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1731 {
1732 int status;
1733
1734 spin_lock(&inode->i_lock);
1735 nfs_fattr_set_barrier(fattr);
1736 status = nfs_post_op_update_inode_locked(inode, fattr,
1737 NFS_INO_INVALID_CHANGE
1738 | NFS_INO_INVALID_CTIME
1739 | NFS_INO_REVAL_FORCED);
1740 spin_unlock(&inode->i_lock);
1741
1742 return status;
1743 }
1744 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1745
1746 /**
1747 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1748 * @inode: pointer to inode
1749 * @fattr: updated attributes
1750 *
1751 * After an operation that has changed the inode metadata, mark the
1752 * attribute cache as being invalid, then try to update it. Fake up
1753 * weak cache consistency data, if none exist.
1754 *
1755 * This function is mainly designed to be used by the ->write_done() functions.
1756 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)1757 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1758 {
1759 int status;
1760
1761 /* Don't do a WCC update if these attributes are already stale */
1762 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1763 !nfs_inode_attrs_need_update(inode, fattr)) {
1764 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1765 | NFS_ATTR_FATTR_PRESIZE
1766 | NFS_ATTR_FATTR_PREMTIME
1767 | NFS_ATTR_FATTR_PRECTIME);
1768 goto out_noforce;
1769 }
1770 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1771 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1772 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1773 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1774 }
1775 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1776 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1777 fattr->pre_ctime = inode->i_ctime;
1778 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1779 }
1780 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1781 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1782 fattr->pre_mtime = inode->i_mtime;
1783 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1784 }
1785 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1786 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1787 fattr->pre_size = i_size_read(inode);
1788 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1789 }
1790 out_noforce:
1791 status = nfs_post_op_update_inode_locked(inode, fattr,
1792 NFS_INO_INVALID_CHANGE
1793 | NFS_INO_INVALID_CTIME
1794 | NFS_INO_INVALID_MTIME
1795 | NFS_INO_INVALID_BLOCKS);
1796 return status;
1797 }
1798
1799 /**
1800 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1801 * @inode: pointer to inode
1802 * @fattr: updated attributes
1803 *
1804 * After an operation that has changed the inode metadata, mark the
1805 * attribute cache as being invalid, then try to update it. Fake up
1806 * weak cache consistency data, if none exist.
1807 *
1808 * This function is mainly designed to be used by the ->write_done() functions.
1809 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)1810 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1811 {
1812 int status;
1813
1814 spin_lock(&inode->i_lock);
1815 nfs_fattr_set_barrier(fattr);
1816 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1817 spin_unlock(&inode->i_lock);
1818 return status;
1819 }
1820 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1821
1822
1823 /*
1824 * Many nfs protocol calls return the new file attributes after
1825 * an operation. Here we update the inode to reflect the state
1826 * of the server's inode.
1827 *
1828 * This is a bit tricky because we have to make sure all dirty pages
1829 * have been sent off to the server before calling invalidate_inode_pages.
1830 * To make sure no other process adds more write requests while we try
1831 * our best to flush them, we make them sleep during the attribute refresh.
1832 *
1833 * A very similar scenario holds for the dir cache.
1834 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)1835 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1836 {
1837 struct nfs_server *server;
1838 struct nfs_inode *nfsi = NFS_I(inode);
1839 loff_t cur_isize, new_isize;
1840 unsigned long invalid = 0;
1841 unsigned long now = jiffies;
1842 unsigned long save_cache_validity;
1843 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1844 bool cache_revalidated = true;
1845 bool attr_changed = false;
1846 bool have_delegation;
1847
1848 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1849 __func__, inode->i_sb->s_id, inode->i_ino,
1850 nfs_display_fhandle_hash(NFS_FH(inode)),
1851 atomic_read(&inode->i_count), fattr->valid);
1852
1853 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1854 /* Only a mounted-on-fileid? Just exit */
1855 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1856 return 0;
1857 /* Has the inode gone and changed behind our back? */
1858 } else if (nfsi->fileid != fattr->fileid) {
1859 /* Is this perhaps the mounted-on fileid? */
1860 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1861 nfsi->fileid == fattr->mounted_on_fileid)
1862 return 0;
1863 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1864 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1865 NFS_SERVER(inode)->nfs_client->cl_hostname,
1866 inode->i_sb->s_id, (long long)nfsi->fileid,
1867 (long long)fattr->fileid);
1868 goto out_err;
1869 }
1870
1871 /*
1872 * Make sure the inode's type hasn't changed.
1873 */
1874 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
1875 /*
1876 * Big trouble! The inode has become a different object.
1877 */
1878 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1879 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1880 goto out_err;
1881 }
1882
1883 server = NFS_SERVER(inode);
1884 /* Update the fsid? */
1885 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1886 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1887 !IS_AUTOMOUNT(inode))
1888 server->fsid = fattr->fsid;
1889
1890 /* Save the delegation state before clearing cache_validity */
1891 have_delegation = nfs_have_delegated_attributes(inode);
1892
1893 /*
1894 * Update the read time so we don't revalidate too often.
1895 */
1896 nfsi->read_cache_jiffies = fattr->time_start;
1897
1898 save_cache_validity = nfsi->cache_validity;
1899 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1900 | NFS_INO_INVALID_ATIME
1901 | NFS_INO_REVAL_FORCED
1902 | NFS_INO_REVAL_PAGECACHE
1903 | NFS_INO_INVALID_BLOCKS);
1904
1905 /* Do atomic weak cache consistency updates */
1906 nfs_wcc_update_inode(inode, fattr);
1907
1908 if (pnfs_layoutcommit_outstanding(inode)) {
1909 nfsi->cache_validity |= save_cache_validity & NFS_INO_INVALID_ATTR;
1910 cache_revalidated = false;
1911 }
1912
1913 /* More cache consistency checks */
1914 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1915 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1916 /* Could it be a race with writeback? */
1917 if (!(have_writers || have_delegation)) {
1918 invalid |= NFS_INO_INVALID_DATA
1919 | NFS_INO_INVALID_ACCESS
1920 | NFS_INO_INVALID_ACL
1921 | NFS_INO_INVALID_XATTR;
1922 /* Force revalidate of all attributes */
1923 save_cache_validity |= NFS_INO_INVALID_CTIME
1924 | NFS_INO_INVALID_MTIME
1925 | NFS_INO_INVALID_SIZE
1926 | NFS_INO_INVALID_OTHER;
1927 if (S_ISDIR(inode->i_mode))
1928 nfs_force_lookup_revalidate(inode);
1929 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1930 inode->i_sb->s_id,
1931 inode->i_ino);
1932 } else if (!have_delegation)
1933 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1934 inode_set_iversion_raw(inode, fattr->change_attr);
1935 attr_changed = true;
1936 }
1937 } else {
1938 nfsi->cache_validity |= save_cache_validity &
1939 (NFS_INO_INVALID_CHANGE
1940 | NFS_INO_REVAL_PAGECACHE
1941 | NFS_INO_REVAL_FORCED);
1942 cache_revalidated = false;
1943 }
1944
1945 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1946 inode->i_mtime = fattr->mtime;
1947 } else if (server->caps & NFS_CAP_MTIME) {
1948 nfsi->cache_validity |= save_cache_validity &
1949 (NFS_INO_INVALID_MTIME
1950 | NFS_INO_REVAL_FORCED);
1951 cache_revalidated = false;
1952 }
1953
1954 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1955 inode->i_ctime = fattr->ctime;
1956 } else if (server->caps & NFS_CAP_CTIME) {
1957 nfsi->cache_validity |= save_cache_validity &
1958 (NFS_INO_INVALID_CTIME
1959 | NFS_INO_REVAL_FORCED);
1960 cache_revalidated = false;
1961 }
1962
1963 /* Check if our cached file size is stale */
1964 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1965 new_isize = nfs_size_to_loff_t(fattr->size);
1966 cur_isize = i_size_read(inode);
1967 if (new_isize != cur_isize && !have_delegation) {
1968 /* Do we perhaps have any outstanding writes, or has
1969 * the file grown beyond our last write? */
1970 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1971 i_size_write(inode, new_isize);
1972 if (!have_writers)
1973 invalid |= NFS_INO_INVALID_DATA;
1974 attr_changed = true;
1975 }
1976 dprintk("NFS: isize change on server for file %s/%ld "
1977 "(%Ld to %Ld)\n",
1978 inode->i_sb->s_id,
1979 inode->i_ino,
1980 (long long)cur_isize,
1981 (long long)new_isize);
1982 }
1983 } else {
1984 nfsi->cache_validity |= save_cache_validity &
1985 (NFS_INO_INVALID_SIZE
1986 | NFS_INO_REVAL_PAGECACHE
1987 | NFS_INO_REVAL_FORCED);
1988 cache_revalidated = false;
1989 }
1990
1991
1992 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1993 inode->i_atime = fattr->atime;
1994 else if (server->caps & NFS_CAP_ATIME) {
1995 nfsi->cache_validity |= save_cache_validity &
1996 (NFS_INO_INVALID_ATIME
1997 | NFS_INO_REVAL_FORCED);
1998 cache_revalidated = false;
1999 }
2000
2001 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2002 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2003 umode_t newmode = inode->i_mode & S_IFMT;
2004 newmode |= fattr->mode & S_IALLUGO;
2005 inode->i_mode = newmode;
2006 invalid |= NFS_INO_INVALID_ACCESS
2007 | NFS_INO_INVALID_ACL;
2008 attr_changed = true;
2009 }
2010 } else if (server->caps & NFS_CAP_MODE) {
2011 nfsi->cache_validity |= save_cache_validity &
2012 (NFS_INO_INVALID_OTHER
2013 | NFS_INO_REVAL_FORCED);
2014 cache_revalidated = false;
2015 }
2016
2017 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2018 if (!uid_eq(inode->i_uid, fattr->uid)) {
2019 invalid |= NFS_INO_INVALID_ACCESS
2020 | NFS_INO_INVALID_ACL;
2021 inode->i_uid = fattr->uid;
2022 attr_changed = true;
2023 }
2024 } else if (server->caps & NFS_CAP_OWNER) {
2025 nfsi->cache_validity |= save_cache_validity &
2026 (NFS_INO_INVALID_OTHER
2027 | NFS_INO_REVAL_FORCED);
2028 cache_revalidated = false;
2029 }
2030
2031 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2032 if (!gid_eq(inode->i_gid, fattr->gid)) {
2033 invalid |= NFS_INO_INVALID_ACCESS
2034 | NFS_INO_INVALID_ACL;
2035 inode->i_gid = fattr->gid;
2036 attr_changed = true;
2037 }
2038 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
2039 nfsi->cache_validity |= save_cache_validity &
2040 (NFS_INO_INVALID_OTHER
2041 | NFS_INO_REVAL_FORCED);
2042 cache_revalidated = false;
2043 }
2044
2045 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2046 if (inode->i_nlink != fattr->nlink) {
2047 if (S_ISDIR(inode->i_mode))
2048 invalid |= NFS_INO_INVALID_DATA;
2049 set_nlink(inode, fattr->nlink);
2050 attr_changed = true;
2051 }
2052 } else if (server->caps & NFS_CAP_NLINK) {
2053 nfsi->cache_validity |= save_cache_validity &
2054 (NFS_INO_INVALID_OTHER
2055 | NFS_INO_REVAL_FORCED);
2056 cache_revalidated = false;
2057 }
2058
2059 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2060 /*
2061 * report the blocks in 512byte units
2062 */
2063 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2064 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2065 inode->i_blocks = fattr->du.nfs2.blocks;
2066 else {
2067 nfsi->cache_validity |= save_cache_validity &
2068 (NFS_INO_INVALID_BLOCKS
2069 | NFS_INO_REVAL_FORCED);
2070 cache_revalidated = false;
2071 }
2072
2073 /* Update attrtimeo value if we're out of the unstable period */
2074 if (attr_changed) {
2075 invalid &= ~NFS_INO_INVALID_ATTR;
2076 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2077 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2078 nfsi->attrtimeo_timestamp = now;
2079 /* Set barrier to be more recent than all outstanding updates */
2080 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2081 } else {
2082 if (cache_revalidated) {
2083 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2084 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2085 nfsi->attrtimeo <<= 1;
2086 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2087 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2088 }
2089 nfsi->attrtimeo_timestamp = now;
2090 }
2091 /* Set the barrier to be more recent than this fattr */
2092 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2093 nfsi->attr_gencount = fattr->gencount;
2094 }
2095
2096 /* Don't invalidate the data if we were to blame */
2097 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2098 || S_ISLNK(inode->i_mode)))
2099 invalid &= ~NFS_INO_INVALID_DATA;
2100 nfs_set_cache_invalid(inode, invalid);
2101
2102 return 0;
2103 out_err:
2104 /*
2105 * No need to worry about unhashing the dentry, as the
2106 * lookup validation will know that the inode is bad.
2107 * (But we fall through to invalidate the caches.)
2108 */
2109 nfs_set_inode_stale_locked(inode);
2110 return -ESTALE;
2111 }
2112
nfs_alloc_inode(struct super_block * sb)2113 struct inode *nfs_alloc_inode(struct super_block *sb)
2114 {
2115 struct nfs_inode *nfsi;
2116 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2117 if (!nfsi)
2118 return NULL;
2119 nfsi->flags = 0UL;
2120 nfsi->cache_validity = 0UL;
2121 #if IS_ENABLED(CONFIG_NFS_V4)
2122 nfsi->nfs4_acl = NULL;
2123 #endif /* CONFIG_NFS_V4 */
2124 #ifdef CONFIG_NFS_V4_2
2125 nfsi->xattr_cache = NULL;
2126 #endif
2127 return &nfsi->vfs_inode;
2128 }
2129 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2130
nfs_free_inode(struct inode * inode)2131 void nfs_free_inode(struct inode *inode)
2132 {
2133 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2134 }
2135 EXPORT_SYMBOL_GPL(nfs_free_inode);
2136
nfs4_init_once(struct nfs_inode * nfsi)2137 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2138 {
2139 #if IS_ENABLED(CONFIG_NFS_V4)
2140 INIT_LIST_HEAD(&nfsi->open_states);
2141 nfsi->delegation = NULL;
2142 init_rwsem(&nfsi->rwsem);
2143 nfsi->layout = NULL;
2144 #endif
2145 }
2146
init_once(void * foo)2147 static void init_once(void *foo)
2148 {
2149 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2150
2151 inode_init_once(&nfsi->vfs_inode);
2152 INIT_LIST_HEAD(&nfsi->open_files);
2153 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2154 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2155 INIT_LIST_HEAD(&nfsi->commit_info.list);
2156 atomic_long_set(&nfsi->nrequests, 0);
2157 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2158 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2159 init_rwsem(&nfsi->rmdir_sem);
2160 mutex_init(&nfsi->commit_mutex);
2161 nfs4_init_once(nfsi);
2162 nfsi->cache_change_attribute = 0;
2163 }
2164
nfs_init_inodecache(void)2165 static int __init nfs_init_inodecache(void)
2166 {
2167 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2168 sizeof(struct nfs_inode),
2169 0, (SLAB_RECLAIM_ACCOUNT|
2170 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2171 init_once);
2172 if (nfs_inode_cachep == NULL)
2173 return -ENOMEM;
2174
2175 return 0;
2176 }
2177
nfs_destroy_inodecache(void)2178 static void nfs_destroy_inodecache(void)
2179 {
2180 /*
2181 * Make sure all delayed rcu free inodes are flushed before we
2182 * destroy cache.
2183 */
2184 rcu_barrier();
2185 kmem_cache_destroy(nfs_inode_cachep);
2186 }
2187
2188 struct workqueue_struct *nfsiod_workqueue;
2189 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2190
2191 /*
2192 * start up the nfsiod workqueue
2193 */
nfsiod_start(void)2194 static int nfsiod_start(void)
2195 {
2196 struct workqueue_struct *wq;
2197 dprintk("RPC: creating workqueue nfsiod\n");
2198 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2199 if (wq == NULL)
2200 return -ENOMEM;
2201 nfsiod_workqueue = wq;
2202 return 0;
2203 }
2204
2205 /*
2206 * Destroy the nfsiod workqueue
2207 */
nfsiod_stop(void)2208 static void nfsiod_stop(void)
2209 {
2210 struct workqueue_struct *wq;
2211
2212 wq = nfsiod_workqueue;
2213 if (wq == NULL)
2214 return;
2215 nfsiod_workqueue = NULL;
2216 destroy_workqueue(wq);
2217 }
2218
2219 unsigned int nfs_net_id;
2220 EXPORT_SYMBOL_GPL(nfs_net_id);
2221
nfs_net_init(struct net * net)2222 static int nfs_net_init(struct net *net)
2223 {
2224 nfs_clients_init(net);
2225 return nfs_fs_proc_net_init(net);
2226 }
2227
nfs_net_exit(struct net * net)2228 static void nfs_net_exit(struct net *net)
2229 {
2230 nfs_fs_proc_net_exit(net);
2231 nfs_clients_exit(net);
2232 }
2233
2234 static struct pernet_operations nfs_net_ops = {
2235 .init = nfs_net_init,
2236 .exit = nfs_net_exit,
2237 .id = &nfs_net_id,
2238 .size = sizeof(struct nfs_net),
2239 };
2240
2241 /*
2242 * Initialize NFS
2243 */
init_nfs_fs(void)2244 static int __init init_nfs_fs(void)
2245 {
2246 int err;
2247
2248 err = nfs_sysfs_init();
2249 if (err < 0)
2250 goto out10;
2251
2252 err = register_pernet_subsys(&nfs_net_ops);
2253 if (err < 0)
2254 goto out9;
2255
2256 err = nfs_fscache_register();
2257 if (err < 0)
2258 goto out8;
2259
2260 err = nfsiod_start();
2261 if (err)
2262 goto out7;
2263
2264 err = nfs_fs_proc_init();
2265 if (err)
2266 goto out6;
2267
2268 err = nfs_init_nfspagecache();
2269 if (err)
2270 goto out5;
2271
2272 err = nfs_init_inodecache();
2273 if (err)
2274 goto out4;
2275
2276 err = nfs_init_readpagecache();
2277 if (err)
2278 goto out3;
2279
2280 err = nfs_init_writepagecache();
2281 if (err)
2282 goto out2;
2283
2284 err = nfs_init_directcache();
2285 if (err)
2286 goto out1;
2287
2288 rpc_proc_register(&init_net, &nfs_rpcstat);
2289
2290 err = register_nfs_fs();
2291 if (err)
2292 goto out0;
2293
2294 return 0;
2295 out0:
2296 rpc_proc_unregister(&init_net, "nfs");
2297 nfs_destroy_directcache();
2298 out1:
2299 nfs_destroy_writepagecache();
2300 out2:
2301 nfs_destroy_readpagecache();
2302 out3:
2303 nfs_destroy_inodecache();
2304 out4:
2305 nfs_destroy_nfspagecache();
2306 out5:
2307 nfs_fs_proc_exit();
2308 out6:
2309 nfsiod_stop();
2310 out7:
2311 nfs_fscache_unregister();
2312 out8:
2313 unregister_pernet_subsys(&nfs_net_ops);
2314 out9:
2315 nfs_sysfs_exit();
2316 out10:
2317 return err;
2318 }
2319
exit_nfs_fs(void)2320 static void __exit exit_nfs_fs(void)
2321 {
2322 nfs_destroy_directcache();
2323 nfs_destroy_writepagecache();
2324 nfs_destroy_readpagecache();
2325 nfs_destroy_inodecache();
2326 nfs_destroy_nfspagecache();
2327 nfs_fscache_unregister();
2328 unregister_pernet_subsys(&nfs_net_ops);
2329 rpc_proc_unregister(&init_net, "nfs");
2330 unregister_nfs_fs();
2331 nfs_fs_proc_exit();
2332 nfsiod_stop();
2333 nfs_sysfs_exit();
2334 }
2335
2336 /* Not quite true; I just maintain it */
2337 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2338 MODULE_LICENSE("GPL");
2339 module_param(enable_ino64, bool, 0644);
2340
2341 module_init(init_nfs_fs)
2342 module_exit(exit_nfs_fs)
2343