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 fattr->mdsthreshold = NULL;
1536 }
1537 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1538
1539 /**
1540 * nfs_fattr_set_barrier
1541 * @fattr: attributes
1542 *
1543 * Used to set a barrier after an attribute was updated. This
1544 * barrier ensures that older attributes from RPC calls that may
1545 * have raced with our update cannot clobber these new values.
1546 * Note that you are still responsible for ensuring that other
1547 * operations which change the attribute on the server do not
1548 * collide.
1549 */
nfs_fattr_set_barrier(struct nfs_fattr * fattr)1550 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1551 {
1552 fattr->gencount = nfs_inc_attr_generation_counter();
1553 }
1554
nfs_alloc_fattr(void)1555 struct nfs_fattr *nfs_alloc_fattr(void)
1556 {
1557 struct nfs_fattr *fattr;
1558
1559 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1560 if (fattr != NULL)
1561 nfs_fattr_init(fattr);
1562 return fattr;
1563 }
1564 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1565
nfs_alloc_fhandle(void)1566 struct nfs_fh *nfs_alloc_fhandle(void)
1567 {
1568 struct nfs_fh *fh;
1569
1570 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1571 if (fh != NULL)
1572 fh->size = 0;
1573 return fh;
1574 }
1575 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1576
1577 #ifdef NFS_DEBUG
1578 /*
1579 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1580 * in the same way that wireshark does
1581 *
1582 * @fh: file handle
1583 *
1584 * For debugging only.
1585 */
_nfs_display_fhandle_hash(const struct nfs_fh * fh)1586 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1587 {
1588 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1589 * not on the result */
1590 return nfs_fhandle_hash(fh);
1591 }
1592 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1593
1594 /*
1595 * _nfs_display_fhandle - display an NFS file handle on the console
1596 *
1597 * @fh: file handle to display
1598 * @caption: display caption
1599 *
1600 * For debugging only.
1601 */
_nfs_display_fhandle(const struct nfs_fh * fh,const char * caption)1602 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1603 {
1604 unsigned short i;
1605
1606 if (fh == NULL || fh->size == 0) {
1607 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1608 return;
1609 }
1610
1611 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1612 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1613 for (i = 0; i < fh->size; i += 16) {
1614 __be32 *pos = (__be32 *)&fh->data[i];
1615
1616 switch ((fh->size - i - 1) >> 2) {
1617 case 0:
1618 printk(KERN_DEFAULT " %08x\n",
1619 be32_to_cpup(pos));
1620 break;
1621 case 1:
1622 printk(KERN_DEFAULT " %08x %08x\n",
1623 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1624 break;
1625 case 2:
1626 printk(KERN_DEFAULT " %08x %08x %08x\n",
1627 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1628 be32_to_cpup(pos + 2));
1629 break;
1630 default:
1631 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1632 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1633 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1634 }
1635 }
1636 }
1637 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1638 #endif
1639
1640 /**
1641 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1642 * @inode: pointer to inode
1643 * @fattr: attributes
1644 *
1645 * Attempt to divine whether or not an RPC call reply carrying stale
1646 * attributes got scheduled after another call carrying updated ones.
1647 *
1648 * To do so, the function first assumes that a more recent ctime means
1649 * that the attributes in fattr are newer, however it also attempt to
1650 * catch the case where ctime either didn't change, or went backwards
1651 * (if someone reset the clock on the server) by looking at whether
1652 * or not this RPC call was started after the inode was last updated.
1653 * Note also the check for wraparound of 'attr_gencount'
1654 *
1655 * The function returns 'true' if it thinks the attributes in 'fattr' are
1656 * more recent than the ones cached in the inode.
1657 *
1658 */
nfs_inode_attrs_need_update(const struct inode * inode,const struct nfs_fattr * fattr)1659 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1660 {
1661 unsigned long attr_gencount = NFS_I(inode)->attr_gencount;
1662
1663 return (long)(fattr->gencount - attr_gencount) > 0 ||
1664 (long)(attr_gencount - nfs_read_attr_generation_counter()) > 0;
1665 }
1666
nfs_refresh_inode_locked(struct inode * inode,struct nfs_fattr * fattr)1667 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1668 {
1669 int ret;
1670
1671 trace_nfs_refresh_inode_enter(inode);
1672
1673 if (nfs_inode_attrs_need_update(inode, fattr))
1674 ret = nfs_update_inode(inode, fattr);
1675 else
1676 ret = nfs_check_inode_attributes(inode, fattr);
1677
1678 trace_nfs_refresh_inode_exit(inode, ret);
1679 return ret;
1680 }
1681
1682 /**
1683 * nfs_refresh_inode - try to update the inode attribute cache
1684 * @inode: pointer to inode
1685 * @fattr: updated attributes
1686 *
1687 * Check that an RPC call that returned attributes has not overlapped with
1688 * other recent updates of the inode metadata, then decide whether it is
1689 * safe to do a full update of the inode attributes, or whether just to
1690 * call nfs_check_inode_attributes.
1691 */
nfs_refresh_inode(struct inode * inode,struct nfs_fattr * fattr)1692 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1693 {
1694 int status;
1695
1696 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1697 return 0;
1698 spin_lock(&inode->i_lock);
1699 status = nfs_refresh_inode_locked(inode, fattr);
1700 spin_unlock(&inode->i_lock);
1701
1702 return status;
1703 }
1704 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1705
nfs_post_op_update_inode_locked(struct inode * inode,struct nfs_fattr * fattr,unsigned int invalid)1706 static int nfs_post_op_update_inode_locked(struct inode *inode,
1707 struct nfs_fattr *fattr, unsigned int invalid)
1708 {
1709 if (S_ISDIR(inode->i_mode))
1710 invalid |= NFS_INO_INVALID_DATA;
1711 nfs_set_cache_invalid(inode, invalid);
1712 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1713 return 0;
1714 return nfs_refresh_inode_locked(inode, fattr);
1715 }
1716
1717 /**
1718 * nfs_post_op_update_inode - try to update the inode attribute cache
1719 * @inode: pointer to inode
1720 * @fattr: updated attributes
1721 *
1722 * After an operation that has changed the inode metadata, mark the
1723 * attribute cache as being invalid, then try to update it.
1724 *
1725 * NB: if the server didn't return any post op attributes, this
1726 * function will force the retrieval of attributes before the next
1727 * NFS request. Thus it should be used only for operations that
1728 * are expected to change one or more attributes, to avoid
1729 * unnecessary NFS requests and trips through nfs_update_inode().
1730 */
nfs_post_op_update_inode(struct inode * inode,struct nfs_fattr * fattr)1731 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1732 {
1733 int status;
1734
1735 spin_lock(&inode->i_lock);
1736 nfs_fattr_set_barrier(fattr);
1737 status = nfs_post_op_update_inode_locked(inode, fattr,
1738 NFS_INO_INVALID_CHANGE
1739 | NFS_INO_INVALID_CTIME
1740 | NFS_INO_REVAL_FORCED);
1741 spin_unlock(&inode->i_lock);
1742
1743 return status;
1744 }
1745 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1746
1747 /**
1748 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1749 * @inode: pointer to inode
1750 * @fattr: updated attributes
1751 *
1752 * After an operation that has changed the inode metadata, mark the
1753 * attribute cache as being invalid, then try to update it. Fake up
1754 * weak cache consistency data, if none exist.
1755 *
1756 * This function is mainly designed to be used by the ->write_done() functions.
1757 */
nfs_post_op_update_inode_force_wcc_locked(struct inode * inode,struct nfs_fattr * fattr)1758 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1759 {
1760 int status;
1761
1762 /* Don't do a WCC update if these attributes are already stale */
1763 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1764 !nfs_inode_attrs_need_update(inode, fattr)) {
1765 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1766 | NFS_ATTR_FATTR_PRESIZE
1767 | NFS_ATTR_FATTR_PREMTIME
1768 | NFS_ATTR_FATTR_PRECTIME);
1769 goto out_noforce;
1770 }
1771 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1772 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1773 fattr->pre_change_attr = inode_peek_iversion_raw(inode);
1774 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1775 }
1776 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1777 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1778 fattr->pre_ctime = inode->i_ctime;
1779 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1780 }
1781 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1782 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1783 fattr->pre_mtime = inode->i_mtime;
1784 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1785 }
1786 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1787 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1788 fattr->pre_size = i_size_read(inode);
1789 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1790 }
1791 out_noforce:
1792 status = nfs_post_op_update_inode_locked(inode, fattr,
1793 NFS_INO_INVALID_CHANGE
1794 | NFS_INO_INVALID_CTIME
1795 | NFS_INO_INVALID_MTIME
1796 | NFS_INO_INVALID_BLOCKS);
1797 return status;
1798 }
1799
1800 /**
1801 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1802 * @inode: pointer to inode
1803 * @fattr: updated attributes
1804 *
1805 * After an operation that has changed the inode metadata, mark the
1806 * attribute cache as being invalid, then try to update it. Fake up
1807 * weak cache consistency data, if none exist.
1808 *
1809 * This function is mainly designed to be used by the ->write_done() functions.
1810 */
nfs_post_op_update_inode_force_wcc(struct inode * inode,struct nfs_fattr * fattr)1811 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1812 {
1813 int status;
1814
1815 spin_lock(&inode->i_lock);
1816 nfs_fattr_set_barrier(fattr);
1817 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1818 spin_unlock(&inode->i_lock);
1819 return status;
1820 }
1821 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1822
1823
1824 /*
1825 * Many nfs protocol calls return the new file attributes after
1826 * an operation. Here we update the inode to reflect the state
1827 * of the server's inode.
1828 *
1829 * This is a bit tricky because we have to make sure all dirty pages
1830 * have been sent off to the server before calling invalidate_inode_pages.
1831 * To make sure no other process adds more write requests while we try
1832 * our best to flush them, we make them sleep during the attribute refresh.
1833 *
1834 * A very similar scenario holds for the dir cache.
1835 */
nfs_update_inode(struct inode * inode,struct nfs_fattr * fattr)1836 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1837 {
1838 struct nfs_server *server;
1839 struct nfs_inode *nfsi = NFS_I(inode);
1840 loff_t cur_isize, new_isize;
1841 unsigned long invalid = 0;
1842 unsigned long now = jiffies;
1843 unsigned long save_cache_validity;
1844 bool have_writers = nfs_file_has_buffered_writers(nfsi);
1845 bool cache_revalidated = true;
1846 bool attr_changed = false;
1847 bool have_delegation;
1848
1849 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1850 __func__, inode->i_sb->s_id, inode->i_ino,
1851 nfs_display_fhandle_hash(NFS_FH(inode)),
1852 atomic_read(&inode->i_count), fattr->valid);
1853
1854 if (!(fattr->valid & NFS_ATTR_FATTR_FILEID)) {
1855 /* Only a mounted-on-fileid? Just exit */
1856 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1857 return 0;
1858 /* Has the inode gone and changed behind our back? */
1859 } else if (nfsi->fileid != fattr->fileid) {
1860 /* Is this perhaps the mounted-on fileid? */
1861 if ((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) &&
1862 nfsi->fileid == fattr->mounted_on_fileid)
1863 return 0;
1864 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1865 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1866 NFS_SERVER(inode)->nfs_client->cl_hostname,
1867 inode->i_sb->s_id, (long long)nfsi->fileid,
1868 (long long)fattr->fileid);
1869 goto out_err;
1870 }
1871
1872 /*
1873 * Make sure the inode's type hasn't changed.
1874 */
1875 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && inode_wrong_type(inode, fattr->mode)) {
1876 /*
1877 * Big trouble! The inode has become a different object.
1878 */
1879 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1880 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1881 goto out_err;
1882 }
1883
1884 server = NFS_SERVER(inode);
1885 /* Update the fsid? */
1886 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1887 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1888 !IS_AUTOMOUNT(inode))
1889 server->fsid = fattr->fsid;
1890
1891 /* Save the delegation state before clearing cache_validity */
1892 have_delegation = nfs_have_delegated_attributes(inode);
1893
1894 /*
1895 * Update the read time so we don't revalidate too often.
1896 */
1897 nfsi->read_cache_jiffies = fattr->time_start;
1898
1899 save_cache_validity = nfsi->cache_validity;
1900 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1901 | NFS_INO_INVALID_ATIME
1902 | NFS_INO_REVAL_FORCED
1903 | NFS_INO_REVAL_PAGECACHE
1904 | NFS_INO_INVALID_BLOCKS);
1905
1906 /* Do atomic weak cache consistency updates */
1907 nfs_wcc_update_inode(inode, fattr);
1908
1909 if (pnfs_layoutcommit_outstanding(inode)) {
1910 nfsi->cache_validity |=
1911 save_cache_validity &
1912 (NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME |
1913 NFS_INO_INVALID_MTIME | NFS_INO_INVALID_SIZE |
1914 NFS_INO_REVAL_FORCED);
1915 cache_revalidated = false;
1916 }
1917
1918 /* More cache consistency checks */
1919 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1920 if (!inode_eq_iversion_raw(inode, fattr->change_attr)) {
1921 /* Could it be a race with writeback? */
1922 if (!(have_writers || have_delegation)) {
1923 invalid |= NFS_INO_INVALID_DATA
1924 | NFS_INO_INVALID_ACCESS
1925 | NFS_INO_INVALID_ACL
1926 | NFS_INO_INVALID_XATTR;
1927 /* Force revalidate of all attributes */
1928 save_cache_validity |= NFS_INO_INVALID_CTIME
1929 | NFS_INO_INVALID_MTIME
1930 | NFS_INO_INVALID_SIZE
1931 | NFS_INO_INVALID_OTHER;
1932 if (S_ISDIR(inode->i_mode))
1933 nfs_force_lookup_revalidate(inode);
1934 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1935 inode->i_sb->s_id,
1936 inode->i_ino);
1937 } else if (!have_delegation)
1938 nfsi->cache_validity |= NFS_INO_DATA_INVAL_DEFER;
1939 inode_set_iversion_raw(inode, fattr->change_attr);
1940 attr_changed = true;
1941 }
1942 } else {
1943 nfsi->cache_validity |= save_cache_validity &
1944 (NFS_INO_INVALID_CHANGE
1945 | NFS_INO_REVAL_PAGECACHE
1946 | NFS_INO_REVAL_FORCED);
1947 cache_revalidated = false;
1948 }
1949
1950 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1951 inode->i_mtime = fattr->mtime;
1952 } else if (server->caps & NFS_CAP_MTIME) {
1953 nfsi->cache_validity |= save_cache_validity &
1954 (NFS_INO_INVALID_MTIME
1955 | NFS_INO_REVAL_FORCED);
1956 cache_revalidated = false;
1957 }
1958
1959 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1960 inode->i_ctime = fattr->ctime;
1961 } else if (server->caps & NFS_CAP_CTIME) {
1962 nfsi->cache_validity |= save_cache_validity &
1963 (NFS_INO_INVALID_CTIME
1964 | NFS_INO_REVAL_FORCED);
1965 cache_revalidated = false;
1966 }
1967
1968 /* Check if our cached file size is stale */
1969 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1970 new_isize = nfs_size_to_loff_t(fattr->size);
1971 cur_isize = i_size_read(inode);
1972 if (new_isize != cur_isize && !have_delegation) {
1973 /* Do we perhaps have any outstanding writes, or has
1974 * the file grown beyond our last write? */
1975 if (!nfs_have_writebacks(inode) || new_isize > cur_isize) {
1976 i_size_write(inode, new_isize);
1977 if (!have_writers)
1978 invalid |= NFS_INO_INVALID_DATA;
1979 attr_changed = true;
1980 }
1981 dprintk("NFS: isize change on server for file %s/%ld "
1982 "(%Ld to %Ld)\n",
1983 inode->i_sb->s_id,
1984 inode->i_ino,
1985 (long long)cur_isize,
1986 (long long)new_isize);
1987 }
1988 } else {
1989 nfsi->cache_validity |= save_cache_validity &
1990 (NFS_INO_INVALID_SIZE
1991 | NFS_INO_REVAL_PAGECACHE
1992 | NFS_INO_REVAL_FORCED);
1993 cache_revalidated = false;
1994 }
1995
1996
1997 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1998 inode->i_atime = fattr->atime;
1999 else if (server->caps & NFS_CAP_ATIME) {
2000 nfsi->cache_validity |= save_cache_validity &
2001 (NFS_INO_INVALID_ATIME
2002 | NFS_INO_REVAL_FORCED);
2003 cache_revalidated = false;
2004 }
2005
2006 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
2007 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
2008 umode_t newmode = inode->i_mode & S_IFMT;
2009 newmode |= fattr->mode & S_IALLUGO;
2010 inode->i_mode = newmode;
2011 invalid |= NFS_INO_INVALID_ACCESS
2012 | NFS_INO_INVALID_ACL;
2013 attr_changed = true;
2014 }
2015 } else if (server->caps & NFS_CAP_MODE) {
2016 nfsi->cache_validity |= save_cache_validity &
2017 (NFS_INO_INVALID_OTHER
2018 | NFS_INO_REVAL_FORCED);
2019 cache_revalidated = false;
2020 }
2021
2022 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
2023 if (!uid_eq(inode->i_uid, fattr->uid)) {
2024 invalid |= NFS_INO_INVALID_ACCESS
2025 | NFS_INO_INVALID_ACL;
2026 inode->i_uid = fattr->uid;
2027 attr_changed = true;
2028 }
2029 } else if (server->caps & NFS_CAP_OWNER) {
2030 nfsi->cache_validity |= save_cache_validity &
2031 (NFS_INO_INVALID_OTHER
2032 | NFS_INO_REVAL_FORCED);
2033 cache_revalidated = false;
2034 }
2035
2036 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
2037 if (!gid_eq(inode->i_gid, fattr->gid)) {
2038 invalid |= NFS_INO_INVALID_ACCESS
2039 | NFS_INO_INVALID_ACL;
2040 inode->i_gid = fattr->gid;
2041 attr_changed = true;
2042 }
2043 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
2044 nfsi->cache_validity |= save_cache_validity &
2045 (NFS_INO_INVALID_OTHER
2046 | NFS_INO_REVAL_FORCED);
2047 cache_revalidated = false;
2048 }
2049
2050 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
2051 if (inode->i_nlink != fattr->nlink) {
2052 if (S_ISDIR(inode->i_mode))
2053 invalid |= NFS_INO_INVALID_DATA;
2054 set_nlink(inode, fattr->nlink);
2055 attr_changed = true;
2056 }
2057 } else if (server->caps & NFS_CAP_NLINK) {
2058 nfsi->cache_validity |= save_cache_validity &
2059 (NFS_INO_INVALID_OTHER
2060 | NFS_INO_REVAL_FORCED);
2061 cache_revalidated = false;
2062 }
2063
2064 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
2065 /*
2066 * report the blocks in 512byte units
2067 */
2068 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
2069 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
2070 inode->i_blocks = fattr->du.nfs2.blocks;
2071 else {
2072 nfsi->cache_validity |= save_cache_validity &
2073 (NFS_INO_INVALID_BLOCKS
2074 | NFS_INO_REVAL_FORCED);
2075 cache_revalidated = false;
2076 }
2077
2078 /* Update attrtimeo value if we're out of the unstable period */
2079 if (attr_changed) {
2080 invalid &= ~NFS_INO_INVALID_ATTR;
2081 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
2082 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
2083 nfsi->attrtimeo_timestamp = now;
2084 /* Set barrier to be more recent than all outstanding updates */
2085 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
2086 } else {
2087 if (cache_revalidated) {
2088 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
2089 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
2090 nfsi->attrtimeo <<= 1;
2091 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
2092 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
2093 }
2094 nfsi->attrtimeo_timestamp = now;
2095 }
2096 /* Set the barrier to be more recent than this fattr */
2097 if ((long)(fattr->gencount - nfsi->attr_gencount) > 0)
2098 nfsi->attr_gencount = fattr->gencount;
2099 }
2100
2101 /* Don't invalidate the data if we were to blame */
2102 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
2103 || S_ISLNK(inode->i_mode)))
2104 invalid &= ~NFS_INO_INVALID_DATA;
2105 nfs_set_cache_invalid(inode, invalid);
2106
2107 return 0;
2108 out_err:
2109 /*
2110 * No need to worry about unhashing the dentry, as the
2111 * lookup validation will know that the inode is bad.
2112 * (But we fall through to invalidate the caches.)
2113 */
2114 nfs_set_inode_stale_locked(inode);
2115 return -ESTALE;
2116 }
2117
nfs_alloc_inode(struct super_block * sb)2118 struct inode *nfs_alloc_inode(struct super_block *sb)
2119 {
2120 struct nfs_inode *nfsi;
2121 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
2122 if (!nfsi)
2123 return NULL;
2124 nfsi->flags = 0UL;
2125 nfsi->cache_validity = 0UL;
2126 #if IS_ENABLED(CONFIG_NFS_V4)
2127 nfsi->nfs4_acl = NULL;
2128 #endif /* CONFIG_NFS_V4 */
2129 #ifdef CONFIG_NFS_V4_2
2130 nfsi->xattr_cache = NULL;
2131 #endif
2132 return &nfsi->vfs_inode;
2133 }
2134 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
2135
nfs_free_inode(struct inode * inode)2136 void nfs_free_inode(struct inode *inode)
2137 {
2138 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
2139 }
2140 EXPORT_SYMBOL_GPL(nfs_free_inode);
2141
nfs4_init_once(struct nfs_inode * nfsi)2142 static inline void nfs4_init_once(struct nfs_inode *nfsi)
2143 {
2144 #if IS_ENABLED(CONFIG_NFS_V4)
2145 INIT_LIST_HEAD(&nfsi->open_states);
2146 nfsi->delegation = NULL;
2147 init_rwsem(&nfsi->rwsem);
2148 nfsi->layout = NULL;
2149 #endif
2150 }
2151
init_once(void * foo)2152 static void init_once(void *foo)
2153 {
2154 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
2155
2156 inode_init_once(&nfsi->vfs_inode);
2157 INIT_LIST_HEAD(&nfsi->open_files);
2158 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
2159 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
2160 INIT_LIST_HEAD(&nfsi->commit_info.list);
2161 atomic_long_set(&nfsi->nrequests, 0);
2162 atomic_long_set(&nfsi->commit_info.ncommit, 0);
2163 atomic_set(&nfsi->commit_info.rpcs_out, 0);
2164 init_rwsem(&nfsi->rmdir_sem);
2165 mutex_init(&nfsi->commit_mutex);
2166 nfs4_init_once(nfsi);
2167 nfsi->cache_change_attribute = 0;
2168 }
2169
nfs_init_inodecache(void)2170 static int __init nfs_init_inodecache(void)
2171 {
2172 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
2173 sizeof(struct nfs_inode),
2174 0, (SLAB_RECLAIM_ACCOUNT|
2175 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
2176 init_once);
2177 if (nfs_inode_cachep == NULL)
2178 return -ENOMEM;
2179
2180 return 0;
2181 }
2182
nfs_destroy_inodecache(void)2183 static void nfs_destroy_inodecache(void)
2184 {
2185 /*
2186 * Make sure all delayed rcu free inodes are flushed before we
2187 * destroy cache.
2188 */
2189 rcu_barrier();
2190 kmem_cache_destroy(nfs_inode_cachep);
2191 }
2192
2193 struct workqueue_struct *nfsiod_workqueue;
2194 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
2195
2196 /*
2197 * start up the nfsiod workqueue
2198 */
nfsiod_start(void)2199 static int nfsiod_start(void)
2200 {
2201 struct workqueue_struct *wq;
2202 dprintk("RPC: creating workqueue nfsiod\n");
2203 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM | WQ_UNBOUND, 0);
2204 if (wq == NULL)
2205 return -ENOMEM;
2206 nfsiod_workqueue = wq;
2207 return 0;
2208 }
2209
2210 /*
2211 * Destroy the nfsiod workqueue
2212 */
nfsiod_stop(void)2213 static void nfsiod_stop(void)
2214 {
2215 struct workqueue_struct *wq;
2216
2217 wq = nfsiod_workqueue;
2218 if (wq == NULL)
2219 return;
2220 nfsiod_workqueue = NULL;
2221 destroy_workqueue(wq);
2222 }
2223
2224 unsigned int nfs_net_id;
2225 EXPORT_SYMBOL_GPL(nfs_net_id);
2226
nfs_net_init(struct net * net)2227 static int nfs_net_init(struct net *net)
2228 {
2229 struct nfs_net *nn = net_generic(net, nfs_net_id);
2230
2231 nfs_clients_init(net);
2232
2233 if (!rpc_proc_register(net, &nn->rpcstats)) {
2234 nfs_clients_exit(net);
2235 return -ENOMEM;
2236 }
2237
2238 return nfs_fs_proc_net_init(net);
2239 }
2240
nfs_net_exit(struct net * net)2241 static void nfs_net_exit(struct net *net)
2242 {
2243 rpc_proc_unregister(net, "nfs");
2244 nfs_fs_proc_net_exit(net);
2245 nfs_clients_exit(net);
2246 }
2247
2248 static struct pernet_operations nfs_net_ops = {
2249 .init = nfs_net_init,
2250 .exit = nfs_net_exit,
2251 .id = &nfs_net_id,
2252 .size = sizeof(struct nfs_net),
2253 };
2254
2255 /*
2256 * Initialize NFS
2257 */
init_nfs_fs(void)2258 static int __init init_nfs_fs(void)
2259 {
2260 int err;
2261
2262 err = nfs_sysfs_init();
2263 if (err < 0)
2264 goto out10;
2265
2266 err = register_pernet_subsys(&nfs_net_ops);
2267 if (err < 0)
2268 goto out9;
2269
2270 err = nfs_fscache_register();
2271 if (err < 0)
2272 goto out8;
2273
2274 err = nfsiod_start();
2275 if (err)
2276 goto out7;
2277
2278 err = nfs_fs_proc_init();
2279 if (err)
2280 goto out6;
2281
2282 err = nfs_init_nfspagecache();
2283 if (err)
2284 goto out5;
2285
2286 err = nfs_init_inodecache();
2287 if (err)
2288 goto out4;
2289
2290 err = nfs_init_readpagecache();
2291 if (err)
2292 goto out3;
2293
2294 err = nfs_init_writepagecache();
2295 if (err)
2296 goto out2;
2297
2298 err = nfs_init_directcache();
2299 if (err)
2300 goto out1;
2301
2302 err = register_nfs_fs();
2303 if (err)
2304 goto out0;
2305
2306 return 0;
2307 out0:
2308 nfs_destroy_directcache();
2309 out1:
2310 nfs_destroy_writepagecache();
2311 out2:
2312 nfs_destroy_readpagecache();
2313 out3:
2314 nfs_destroy_inodecache();
2315 out4:
2316 nfs_destroy_nfspagecache();
2317 out5:
2318 nfs_fs_proc_exit();
2319 out6:
2320 nfsiod_stop();
2321 out7:
2322 nfs_fscache_unregister();
2323 out8:
2324 unregister_pernet_subsys(&nfs_net_ops);
2325 out9:
2326 nfs_sysfs_exit();
2327 out10:
2328 return err;
2329 }
2330
exit_nfs_fs(void)2331 static void __exit exit_nfs_fs(void)
2332 {
2333 nfs_destroy_directcache();
2334 nfs_destroy_writepagecache();
2335 nfs_destroy_readpagecache();
2336 nfs_destroy_inodecache();
2337 nfs_destroy_nfspagecache();
2338 nfs_fscache_unregister();
2339 unregister_pernet_subsys(&nfs_net_ops);
2340 unregister_nfs_fs();
2341 nfs_fs_proc_exit();
2342 nfsiod_stop();
2343 nfs_sysfs_exit();
2344 }
2345
2346 /* Not quite true; I just maintain it */
2347 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2348 MODULE_LICENSE("GPL");
2349 module_param(enable_ino64, bool, 0644);
2350
2351 module_init(init_nfs_fs)
2352 module_exit(exit_nfs_fs)
2353