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