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gro: Allow tunnel stacking in the case of FOU/GUE
[linux/fpc-iii.git] / fs / nfs / inode.c
blob723b8922d76b91c5c71dcf49fc4cb89c00f4bc32
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
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 = d_inode(dentry);
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(d_inode(parent));
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 = d_inode(dentry);
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 = d_inode(ctx->dentry);
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 = d_inode(ctx->dentry);
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 = d_inode(ctx->dentry);
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 = d_inode(ctx->dentry);
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 = d_inode(ctx->dentry);
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 = d_inode(ctx->dentry);
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)
1246 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1247 }
1248 if (nfsi->nrequests != 0)
1249 invalid &= ~NFS_INO_REVAL_PAGECACHE;
1250
1251 /* Have any file permissions changed? */
1252 if ((fattr->valid & NFS_ATTR_FATTR_MODE) && (inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO))
1253 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1254 if ((fattr->valid & NFS_ATTR_FATTR_OWNER) && !uid_eq(inode->i_uid, fattr->uid))
1255 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1256 if ((fattr->valid & NFS_ATTR_FATTR_GROUP) && !gid_eq(inode->i_gid, fattr->gid))
1257 invalid |= NFS_INO_INVALID_ATTR | NFS_INO_INVALID_ACCESS | NFS_INO_INVALID_ACL;
1258
1259 /* Has the link count changed? */
1260 if ((fattr->valid & NFS_ATTR_FATTR_NLINK) && inode->i_nlink != fattr->nlink)
1261 invalid |= NFS_INO_INVALID_ATTR;
1262
1263 if ((fattr->valid & NFS_ATTR_FATTR_ATIME) && !timespec_equal(&inode->i_atime, &fattr->atime))
1264 invalid |= NFS_INO_INVALID_ATIME;
1265
1266 if (invalid != 0)
1267 nfs_set_cache_invalid(inode, invalid);
1268
1269 nfsi->read_cache_jiffies = fattr->time_start;
1270 return 0;
1271 }
1272
1273 static atomic_long_t nfs_attr_generation_counter;
1274
1275 static unsigned long nfs_read_attr_generation_counter(void)
1276 {
1277 return atomic_long_read(&nfs_attr_generation_counter);
1278 }
1279
1280 unsigned long nfs_inc_attr_generation_counter(void)
1281 {
1282 return atomic_long_inc_return(&nfs_attr_generation_counter);
1283 }
1284 EXPORT_SYMBOL_GPL(nfs_inc_attr_generation_counter);
1285
1286 void nfs_fattr_init(struct nfs_fattr *fattr)
1287 {
1288 fattr->valid = 0;
1289 fattr->time_start = jiffies;
1290 fattr->gencount = nfs_inc_attr_generation_counter();
1291 fattr->owner_name = NULL;
1292 fattr->group_name = NULL;
1293 }
1294 EXPORT_SYMBOL_GPL(nfs_fattr_init);
1295
1296 /**
1297 * nfs_fattr_set_barrier
1298 * @fattr: attributes
1299 *
1300 * Used to set a barrier after an attribute was updated. This
1301 * barrier ensures that older attributes from RPC calls that may
1302 * have raced with our update cannot clobber these new values.
1303 * Note that you are still responsible for ensuring that other
1304 * operations which change the attribute on the server do not
1305 * collide.
1306 */
1307 void nfs_fattr_set_barrier(struct nfs_fattr *fattr)
1308 {
1309 fattr->gencount = nfs_inc_attr_generation_counter();
1310 }
1311
1312 struct nfs_fattr *nfs_alloc_fattr(void)
1313 {
1314 struct nfs_fattr *fattr;
1315
1316 fattr = kmalloc(sizeof(*fattr), GFP_NOFS);
1317 if (fattr != NULL)
1318 nfs_fattr_init(fattr);
1319 return fattr;
1320 }
1321 EXPORT_SYMBOL_GPL(nfs_alloc_fattr);
1322
1323 struct nfs_fh *nfs_alloc_fhandle(void)
1324 {
1325 struct nfs_fh *fh;
1326
1327 fh = kmalloc(sizeof(struct nfs_fh), GFP_NOFS);
1328 if (fh != NULL)
1329 fh->size = 0;
1330 return fh;
1331 }
1332 EXPORT_SYMBOL_GPL(nfs_alloc_fhandle);
1333
1334 #ifdef NFS_DEBUG
1335 /*
1336 * _nfs_display_fhandle_hash - calculate the crc32 hash for the filehandle
1337 * in the same way that wireshark does
1338 *
1339 * @fh: file handle
1340 *
1341 * For debugging only.
1342 */
1343 u32 _nfs_display_fhandle_hash(const struct nfs_fh *fh)
1344 {
1345 /* wireshark uses 32-bit AUTODIN crc and does a bitwise
1346 * not on the result */
1347 return nfs_fhandle_hash(fh);
1348 }
1349 EXPORT_SYMBOL_GPL(_nfs_display_fhandle_hash);
1350
1351 /*
1352 * _nfs_display_fhandle - display an NFS file handle on the console
1353 *
1354 * @fh: file handle to display
1355 * @caption: display caption
1356 *
1357 * For debugging only.
1358 */
1359 void _nfs_display_fhandle(const struct nfs_fh *fh, const char *caption)
1360 {
1361 unsigned short i;
1362
1363 if (fh == NULL || fh->size == 0) {
1364 printk(KERN_DEFAULT "%s at %p is empty\n", caption, fh);
1365 return;
1366 }
1367
1368 printk(KERN_DEFAULT "%s at %p is %u bytes, crc: 0x%08x:\n",
1369 caption, fh, fh->size, _nfs_display_fhandle_hash(fh));
1370 for (i = 0; i < fh->size; i += 16) {
1371 __be32 *pos = (__be32 *)&fh->data[i];
1372
1373 switch ((fh->size - i - 1) >> 2) {
1374 case 0:
1375 printk(KERN_DEFAULT " %08x\n",
1376 be32_to_cpup(pos));
1377 break;
1378 case 1:
1379 printk(KERN_DEFAULT " %08x %08x\n",
1380 be32_to_cpup(pos), be32_to_cpup(pos + 1));
1381 break;
1382 case 2:
1383 printk(KERN_DEFAULT " %08x %08x %08x\n",
1384 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1385 be32_to_cpup(pos + 2));
1386 break;
1387 default:
1388 printk(KERN_DEFAULT " %08x %08x %08x %08x\n",
1389 be32_to_cpup(pos), be32_to_cpup(pos + 1),
1390 be32_to_cpup(pos + 2), be32_to_cpup(pos + 3));
1391 }
1392 }
1393 }
1394 EXPORT_SYMBOL_GPL(_nfs_display_fhandle);
1395 #endif
1396
1397 /**
1398 * nfs_inode_attrs_need_update - check if the inode attributes need updating
1399 * @inode - pointer to inode
1400 * @fattr - attributes
1401 *
1402 * Attempt to divine whether or not an RPC call reply carrying stale
1403 * attributes got scheduled after another call carrying updated ones.
1404 *
1405 * To do so, the function first assumes that a more recent ctime means
1406 * that the attributes in fattr are newer, however it also attempt to
1407 * catch the case where ctime either didn't change, or went backwards
1408 * (if someone reset the clock on the server) by looking at whether
1409 * or not this RPC call was started after the inode was last updated.
1410 * Note also the check for wraparound of 'attr_gencount'
1411 *
1412 * The function returns 'true' if it thinks the attributes in 'fattr' are
1413 * more recent than the ones cached in the inode.
1414 *
1415 */
1416 static int nfs_inode_attrs_need_update(const struct inode *inode, const struct nfs_fattr *fattr)
1417 {
1418 const struct nfs_inode *nfsi = NFS_I(inode);
1419
1420 return ((long)fattr->gencount - (long)nfsi->attr_gencount) > 0 ||
1421 ((long)nfsi->attr_gencount - (long)nfs_read_attr_generation_counter() > 0);
1422 }
1423
1424 /*
1425 * Don't trust the change_attribute, mtime, ctime or size if
1426 * a pnfs LAYOUTCOMMIT is outstanding
1427 */
1428 static void nfs_inode_attrs_handle_layoutcommit(struct inode *inode,
1429 struct nfs_fattr *fattr)
1430 {
1431 if (pnfs_layoutcommit_outstanding(inode))
1432 fattr->valid &= ~(NFS_ATTR_FATTR_CHANGE |
1433 NFS_ATTR_FATTR_MTIME |
1434 NFS_ATTR_FATTR_CTIME |
1435 NFS_ATTR_FATTR_SIZE);
1436 }
1437
1438 static int nfs_refresh_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1439 {
1440 int ret;
1441
1442 trace_nfs_refresh_inode_enter(inode);
1443
1444 nfs_inode_attrs_handle_layoutcommit(inode, fattr);
1445
1446 if (nfs_inode_attrs_need_update(inode, fattr))
1447 ret = nfs_update_inode(inode, fattr);
1448 else
1449 ret = nfs_check_inode_attributes(inode, fattr);
1450
1451 trace_nfs_refresh_inode_exit(inode, ret);
1452 return ret;
1453 }
1454
1455 /**
1456 * nfs_refresh_inode - try to update the inode attribute cache
1457 * @inode - pointer to inode
1458 * @fattr - updated attributes
1459 *
1460 * Check that an RPC call that returned attributes has not overlapped with
1461 * other recent updates of the inode metadata, then decide whether it is
1462 * safe to do a full update of the inode attributes, or whether just to
1463 * call nfs_check_inode_attributes.
1464 */
1465 int nfs_refresh_inode(struct inode *inode, struct nfs_fattr *fattr)
1466 {
1467 int status;
1468
1469 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1470 return 0;
1471 spin_lock(&inode->i_lock);
1472 status = nfs_refresh_inode_locked(inode, fattr);
1473 spin_unlock(&inode->i_lock);
1474
1475 return status;
1476 }
1477 EXPORT_SYMBOL_GPL(nfs_refresh_inode);
1478
1479 static int nfs_post_op_update_inode_locked(struct inode *inode, struct nfs_fattr *fattr)
1480 {
1481 unsigned long invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_PAGECACHE;
1482
1483 /*
1484 * Don't revalidate the pagecache if we hold a delegation, but do
1485 * force an attribute update
1486 */
1487 if (NFS_PROTO(inode)->have_delegation(inode, FMODE_READ))
1488 invalid = NFS_INO_INVALID_ATTR|NFS_INO_REVAL_FORCED;
1489
1490 if (S_ISDIR(inode->i_mode))
1491 invalid |= NFS_INO_INVALID_DATA;
1492 nfs_set_cache_invalid(inode, invalid);
1493 if ((fattr->valid & NFS_ATTR_FATTR) == 0)
1494 return 0;
1495 return nfs_refresh_inode_locked(inode, fattr);
1496 }
1497
1498 /**
1499 * nfs_post_op_update_inode - try to update the inode attribute cache
1500 * @inode - pointer to inode
1501 * @fattr - updated attributes
1502 *
1503 * After an operation that has changed the inode metadata, mark the
1504 * attribute cache as being invalid, then try to update it.
1505 *
1506 * NB: if the server didn't return any post op attributes, this
1507 * function will force the retrieval of attributes before the next
1508 * NFS request. Thus it should be used only for operations that
1509 * are expected to change one or more attributes, to avoid
1510 * unnecessary NFS requests and trips through nfs_update_inode().
1511 */
1512 int nfs_post_op_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1513 {
1514 int status;
1515
1516 spin_lock(&inode->i_lock);
1517 nfs_fattr_set_barrier(fattr);
1518 status = nfs_post_op_update_inode_locked(inode, fattr);
1519 spin_unlock(&inode->i_lock);
1520
1521 return status;
1522 }
1523 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode);
1524
1525 /**
1526 * nfs_post_op_update_inode_force_wcc_locked - update the inode attribute cache
1527 * @inode - pointer to inode
1528 * @fattr - updated attributes
1529 *
1530 * After an operation that has changed the inode metadata, mark the
1531 * attribute cache as being invalid, then try to update it. Fake up
1532 * weak cache consistency data, if none exist.
1533 *
1534 * This function is mainly designed to be used by the ->write_done() functions.
1535 */
1536 int nfs_post_op_update_inode_force_wcc_locked(struct inode *inode, struct nfs_fattr *fattr)
1537 {
1538 int status;
1539
1540 /* Don't do a WCC update if these attributes are already stale */
1541 if ((fattr->valid & NFS_ATTR_FATTR) == 0 ||
1542 !nfs_inode_attrs_need_update(inode, fattr)) {
1543 fattr->valid &= ~(NFS_ATTR_FATTR_PRECHANGE
1544 | NFS_ATTR_FATTR_PRESIZE
1545 | NFS_ATTR_FATTR_PREMTIME
1546 | NFS_ATTR_FATTR_PRECTIME);
1547 goto out_noforce;
1548 }
1549 if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 &&
1550 (fattr->valid & NFS_ATTR_FATTR_PRECHANGE) == 0) {
1551 fattr->pre_change_attr = inode->i_version;
1552 fattr->valid |= NFS_ATTR_FATTR_PRECHANGE;
1553 }
1554 if ((fattr->valid & NFS_ATTR_FATTR_CTIME) != 0 &&
1555 (fattr->valid & NFS_ATTR_FATTR_PRECTIME) == 0) {
1556 memcpy(&fattr->pre_ctime, &inode->i_ctime, sizeof(fattr->pre_ctime));
1557 fattr->valid |= NFS_ATTR_FATTR_PRECTIME;
1558 }
1559 if ((fattr->valid & NFS_ATTR_FATTR_MTIME) != 0 &&
1560 (fattr->valid & NFS_ATTR_FATTR_PREMTIME) == 0) {
1561 memcpy(&fattr->pre_mtime, &inode->i_mtime, sizeof(fattr->pre_mtime));
1562 fattr->valid |= NFS_ATTR_FATTR_PREMTIME;
1563 }
1564 if ((fattr->valid & NFS_ATTR_FATTR_SIZE) != 0 &&
1565 (fattr->valid & NFS_ATTR_FATTR_PRESIZE) == 0) {
1566 fattr->pre_size = i_size_read(inode);
1567 fattr->valid |= NFS_ATTR_FATTR_PRESIZE;
1568 }
1569 out_noforce:
1570 status = nfs_post_op_update_inode_locked(inode, fattr);
1571 return status;
1572 }
1573
1574 /**
1575 * nfs_post_op_update_inode_force_wcc - try to update the inode attribute cache
1576 * @inode - pointer to inode
1577 * @fattr - updated attributes
1578 *
1579 * After an operation that has changed the inode metadata, mark the
1580 * attribute cache as being invalid, then try to update it. Fake up
1581 * weak cache consistency data, if none exist.
1582 *
1583 * This function is mainly designed to be used by the ->write_done() functions.
1584 */
1585 int nfs_post_op_update_inode_force_wcc(struct inode *inode, struct nfs_fattr *fattr)
1586 {
1587 int status;
1588
1589 spin_lock(&inode->i_lock);
1590 nfs_fattr_set_barrier(fattr);
1591 status = nfs_post_op_update_inode_force_wcc_locked(inode, fattr);
1592 spin_unlock(&inode->i_lock);
1593 return status;
1594 }
1595 EXPORT_SYMBOL_GPL(nfs_post_op_update_inode_force_wcc);
1596
1597
1598 static inline bool nfs_fileid_valid(struct nfs_inode *nfsi,
1599 struct nfs_fattr *fattr)
1600 {
1601 bool ret1 = true, ret2 = true;
1602
1603 if (fattr->valid & NFS_ATTR_FATTR_FILEID)
1604 ret1 = (nfsi->fileid == fattr->fileid);
1605 if (fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID)
1606 ret2 = (nfsi->fileid == fattr->mounted_on_fileid);
1607 return ret1 || ret2;
1608 }
1609
1610 /*
1611 * Many nfs protocol calls return the new file attributes after
1612 * an operation. Here we update the inode to reflect the state
1613 * of the server's inode.
1614 *
1615 * This is a bit tricky because we have to make sure all dirty pages
1616 * have been sent off to the server before calling invalidate_inode_pages.
1617 * To make sure no other process adds more write requests while we try
1618 * our best to flush them, we make them sleep during the attribute refresh.
1619 *
1620 * A very similar scenario holds for the dir cache.
1621 */
1622 static int nfs_update_inode(struct inode *inode, struct nfs_fattr *fattr)
1623 {
1624 struct nfs_server *server;
1625 struct nfs_inode *nfsi = NFS_I(inode);
1626 loff_t cur_isize, new_isize;
1627 unsigned long invalid = 0;
1628 unsigned long now = jiffies;
1629 unsigned long save_cache_validity;
1630 bool cache_revalidated = true;
1631
1632 dfprintk(VFS, "NFS: %s(%s/%lu fh_crc=0x%08x ct=%d info=0x%x)\n",
1633 __func__, inode->i_sb->s_id, inode->i_ino,
1634 nfs_display_fhandle_hash(NFS_FH(inode)),
1635 atomic_read(&inode->i_count), fattr->valid);
1636
1637 if (!nfs_fileid_valid(nfsi, fattr)) {
1638 printk(KERN_ERR "NFS: server %s error: fileid changed\n"
1639 "fsid %s: expected fileid 0x%Lx, got 0x%Lx\n",
1640 NFS_SERVER(inode)->nfs_client->cl_hostname,
1641 inode->i_sb->s_id, (long long)nfsi->fileid,
1642 (long long)fattr->fileid);
1643 goto out_err;
1644 }
1645
1646 /*
1647 * Make sure the inode's type hasn't changed.
1648 */
1649 if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) {
1650 /*
1651 * Big trouble! The inode has become a different object.
1652 */
1653 printk(KERN_DEBUG "NFS: %s: inode %lu mode changed, %07o to %07o\n",
1654 __func__, inode->i_ino, inode->i_mode, fattr->mode);
1655 goto out_err;
1656 }
1657
1658 server = NFS_SERVER(inode);
1659 /* Update the fsid? */
1660 if (S_ISDIR(inode->i_mode) && (fattr->valid & NFS_ATTR_FATTR_FSID) &&
1661 !nfs_fsid_equal(&server->fsid, &fattr->fsid) &&
1662 !IS_AUTOMOUNT(inode))
1663 server->fsid = fattr->fsid;
1664
1665 /*
1666 * Update the read time so we don't revalidate too often.
1667 */
1668 nfsi->read_cache_jiffies = fattr->time_start;
1669
1670 save_cache_validity = nfsi->cache_validity;
1671 nfsi->cache_validity &= ~(NFS_INO_INVALID_ATTR
1672 | NFS_INO_INVALID_ATIME
1673 | NFS_INO_REVAL_FORCED
1674 | NFS_INO_REVAL_PAGECACHE);
1675
1676 /* Do atomic weak cache consistency updates */
1677 invalid |= nfs_wcc_update_inode(inode, fattr);
1678
1679 /* More cache consistency checks */
1680 if (fattr->valid & NFS_ATTR_FATTR_CHANGE) {
1681 if (inode->i_version != fattr->change_attr) {
1682 dprintk("NFS: change_attr change on server for file %s/%ld\n",
1683 inode->i_sb->s_id, inode->i_ino);
1684 invalid |= NFS_INO_INVALID_ATTR
1685 | NFS_INO_INVALID_DATA
1686 | NFS_INO_INVALID_ACCESS
1687 | NFS_INO_INVALID_ACL;
1688 if (S_ISDIR(inode->i_mode))
1689 nfs_force_lookup_revalidate(inode);
1690 inode->i_version = fattr->change_attr;
1691 }
1692 } else {
1693 nfsi->cache_validity |= save_cache_validity;
1694 cache_revalidated = false;
1695 }
1696
1697 if (fattr->valid & NFS_ATTR_FATTR_MTIME) {
1698 memcpy(&inode->i_mtime, &fattr->mtime, sizeof(inode->i_mtime));
1699 } else if (server->caps & NFS_CAP_MTIME) {
1700 nfsi->cache_validity |= save_cache_validity &
1701 (NFS_INO_INVALID_ATTR
1702 | NFS_INO_REVAL_FORCED);
1703 cache_revalidated = false;
1704 }
1705
1706 if (fattr->valid & NFS_ATTR_FATTR_CTIME) {
1707 memcpy(&inode->i_ctime, &fattr->ctime, sizeof(inode->i_ctime));
1708 } else if (server->caps & NFS_CAP_CTIME) {
1709 nfsi->cache_validity |= save_cache_validity &
1710 (NFS_INO_INVALID_ATTR
1711 | NFS_INO_REVAL_FORCED);
1712 cache_revalidated = false;
1713 }
1714
1715 /* Check if our cached file size is stale */
1716 if (fattr->valid & NFS_ATTR_FATTR_SIZE) {
1717 new_isize = nfs_size_to_loff_t(fattr->size);
1718 cur_isize = i_size_read(inode);
1719 if (new_isize != cur_isize) {
1720 /* Do we perhaps have any outstanding writes, or has
1721 * the file grown beyond our last write? */
1722 if ((nfsi->nrequests == 0) || new_isize > cur_isize) {
1723 i_size_write(inode, new_isize);
1724 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA;
1725 }
1726 dprintk("NFS: isize change on server for file %s/%ld "
1727 "(%Ld to %Ld)\n",
1728 inode->i_sb->s_id,
1729 inode->i_ino,
1730 (long long)cur_isize,
1731 (long long)new_isize);
1732 }
1733 } else {
1734 nfsi->cache_validity |= save_cache_validity &
1735 (NFS_INO_INVALID_ATTR
1736 | NFS_INO_REVAL_PAGECACHE
1737 | NFS_INO_REVAL_FORCED);
1738 cache_revalidated = false;
1739 }
1740
1741
1742 if (fattr->valid & NFS_ATTR_FATTR_ATIME)
1743 memcpy(&inode->i_atime, &fattr->atime, sizeof(inode->i_atime));
1744 else if (server->caps & NFS_CAP_ATIME) {
1745 nfsi->cache_validity |= save_cache_validity &
1746 (NFS_INO_INVALID_ATIME
1747 | NFS_INO_REVAL_FORCED);
1748 cache_revalidated = false;
1749 }
1750
1751 if (fattr->valid & NFS_ATTR_FATTR_MODE) {
1752 if ((inode->i_mode & S_IALLUGO) != (fattr->mode & S_IALLUGO)) {
1753 umode_t newmode = inode->i_mode & S_IFMT;
1754 newmode |= fattr->mode & S_IALLUGO;
1755 inode->i_mode = newmode;
1756 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1757 }
1758 } else if (server->caps & NFS_CAP_MODE) {
1759 nfsi->cache_validity |= save_cache_validity &
1760 (NFS_INO_INVALID_ATTR
1761 | NFS_INO_INVALID_ACCESS
1762 | NFS_INO_INVALID_ACL
1763 | NFS_INO_REVAL_FORCED);
1764 cache_revalidated = false;
1765 }
1766
1767 if (fattr->valid & NFS_ATTR_FATTR_OWNER) {
1768 if (!uid_eq(inode->i_uid, fattr->uid)) {
1769 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1770 inode->i_uid = fattr->uid;
1771 }
1772 } else if (server->caps & NFS_CAP_OWNER) {
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 cache_revalidated = false;
1779 }
1780
1781 if (fattr->valid & NFS_ATTR_FATTR_GROUP) {
1782 if (!gid_eq(inode->i_gid, fattr->gid)) {
1783 invalid |= NFS_INO_INVALID_ATTR|NFS_INO_INVALID_ACCESS|NFS_INO_INVALID_ACL;
1784 inode->i_gid = fattr->gid;
1785 }
1786 } else if (server->caps & NFS_CAP_OWNER_GROUP) {
1787 nfsi->cache_validity |= save_cache_validity &
1788 (NFS_INO_INVALID_ATTR
1789 | NFS_INO_INVALID_ACCESS
1790 | NFS_INO_INVALID_ACL
1791 | NFS_INO_REVAL_FORCED);
1792 cache_revalidated = false;
1793 }
1794
1795 if (fattr->valid & NFS_ATTR_FATTR_NLINK) {
1796 if (inode->i_nlink != fattr->nlink) {
1797 invalid |= NFS_INO_INVALID_ATTR;
1798 if (S_ISDIR(inode->i_mode))
1799 invalid |= NFS_INO_INVALID_DATA;
1800 set_nlink(inode, fattr->nlink);
1801 }
1802 } else if (server->caps & NFS_CAP_NLINK) {
1803 nfsi->cache_validity |= save_cache_validity &
1804 (NFS_INO_INVALID_ATTR
1805 | NFS_INO_REVAL_FORCED);
1806 cache_revalidated = false;
1807 }
1808
1809 if (fattr->valid & NFS_ATTR_FATTR_SPACE_USED) {
1810 /*
1811 * report the blocks in 512byte units
1812 */
1813 inode->i_blocks = nfs_calc_block_size(fattr->du.nfs3.used);
1814 } else if (fattr->valid & NFS_ATTR_FATTR_BLOCKS_USED)
1815 inode->i_blocks = fattr->du.nfs2.blocks;
1816 else
1817 cache_revalidated = false;
1818
1819 /* Update attrtimeo value if we're out of the unstable period */
1820 if (invalid & NFS_INO_INVALID_ATTR) {
1821 nfs_inc_stats(inode, NFSIOS_ATTRINVALIDATE);
1822 nfsi->attrtimeo = NFS_MINATTRTIMEO(inode);
1823 nfsi->attrtimeo_timestamp = now;
1824 /* Set barrier to be more recent than all outstanding updates */
1825 nfsi->attr_gencount = nfs_inc_attr_generation_counter();
1826 } else {
1827 if (cache_revalidated) {
1828 if (!time_in_range_open(now, nfsi->attrtimeo_timestamp,
1829 nfsi->attrtimeo_timestamp + nfsi->attrtimeo)) {
1830 nfsi->attrtimeo <<= 1;
1831 if (nfsi->attrtimeo > NFS_MAXATTRTIMEO(inode))
1832 nfsi->attrtimeo = NFS_MAXATTRTIMEO(inode);
1833 }
1834 nfsi->attrtimeo_timestamp = now;
1835 }
1836 /* Set the barrier to be more recent than this fattr */
1837 if ((long)fattr->gencount - (long)nfsi->attr_gencount > 0)
1838 nfsi->attr_gencount = fattr->gencount;
1839 }
1840
1841 /* Don't declare attrcache up to date if there were no attrs! */
1842 if (cache_revalidated)
1843 invalid &= ~NFS_INO_INVALID_ATTR;
1844
1845 /* Don't invalidate the data if we were to blame */
1846 if (!(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode)
1847 || S_ISLNK(inode->i_mode)))
1848 invalid &= ~NFS_INO_INVALID_DATA;
1849 if (!NFS_PROTO(inode)->have_delegation(inode, FMODE_READ) ||
1850 (save_cache_validity & NFS_INO_REVAL_FORCED))
1851 nfs_set_cache_invalid(inode, invalid);
1852
1853 return 0;
1854 out_err:
1855 /*
1856 * No need to worry about unhashing the dentry, as the
1857 * lookup validation will know that the inode is bad.
1858 * (But we fall through to invalidate the caches.)
1859 */
1860 nfs_invalidate_inode(inode);
1861 return -ESTALE;
1862 }
1863
1864 struct inode *nfs_alloc_inode(struct super_block *sb)
1865 {
1866 struct nfs_inode *nfsi;
1867 nfsi = kmem_cache_alloc(nfs_inode_cachep, GFP_KERNEL);
1868 if (!nfsi)
1869 return NULL;
1870 nfsi->flags = 0UL;
1871 nfsi->cache_validity = 0UL;
1872 #if IS_ENABLED(CONFIG_NFS_V4)
1873 nfsi->nfs4_acl = NULL;
1874 #endif /* CONFIG_NFS_V4 */
1875 return &nfsi->vfs_inode;
1876 }
1877 EXPORT_SYMBOL_GPL(nfs_alloc_inode);
1878
1879 static void nfs_i_callback(struct rcu_head *head)
1880 {
1881 struct inode *inode = container_of(head, struct inode, i_rcu);
1882 kmem_cache_free(nfs_inode_cachep, NFS_I(inode));
1883 }
1884
1885 void nfs_destroy_inode(struct inode *inode)
1886 {
1887 call_rcu(&inode->i_rcu, nfs_i_callback);
1888 }
1889 EXPORT_SYMBOL_GPL(nfs_destroy_inode);
1890
1891 static inline void nfs4_init_once(struct nfs_inode *nfsi)
1892 {
1893 #if IS_ENABLED(CONFIG_NFS_V4)
1894 INIT_LIST_HEAD(&nfsi->open_states);
1895 nfsi->delegation = NULL;
1896 init_rwsem(&nfsi->rwsem);
1897 nfsi->layout = NULL;
1898 #endif
1899 }
1900
1901 static void init_once(void *foo)
1902 {
1903 struct nfs_inode *nfsi = (struct nfs_inode *) foo;
1904
1905 inode_init_once(&nfsi->vfs_inode);
1906 INIT_LIST_HEAD(&nfsi->open_files);
1907 INIT_LIST_HEAD(&nfsi->access_cache_entry_lru);
1908 INIT_LIST_HEAD(&nfsi->access_cache_inode_lru);
1909 INIT_LIST_HEAD(&nfsi->commit_info.list);
1910 nfsi->nrequests = 0;
1911 nfsi->commit_info.ncommit = 0;
1912 atomic_set(&nfsi->commit_info.rpcs_out, 0);
1913 atomic_set(&nfsi->silly_count, 1);
1914 INIT_HLIST_HEAD(&nfsi->silly_list);
1915 init_waitqueue_head(&nfsi->waitqueue);
1916 nfs4_init_once(nfsi);
1917 }
1918
1919 static int __init nfs_init_inodecache(void)
1920 {
1921 nfs_inode_cachep = kmem_cache_create("nfs_inode_cache",
1922 sizeof(struct nfs_inode),
1923 0, (SLAB_RECLAIM_ACCOUNT|
1924 SLAB_MEM_SPREAD),
1925 init_once);
1926 if (nfs_inode_cachep == NULL)
1927 return -ENOMEM;
1928
1929 return 0;
1930 }
1931
1932 static void nfs_destroy_inodecache(void)
1933 {
1934 /*
1935 * Make sure all delayed rcu free inodes are flushed before we
1936 * destroy cache.
1937 */
1938 rcu_barrier();
1939 kmem_cache_destroy(nfs_inode_cachep);
1940 }
1941
1942 struct workqueue_struct *nfsiod_workqueue;
1943 EXPORT_SYMBOL_GPL(nfsiod_workqueue);
1944
1945 /*
1946 * start up the nfsiod workqueue
1947 */
1948 static int nfsiod_start(void)
1949 {
1950 struct workqueue_struct *wq;
1951 dprintk("RPC: creating workqueue nfsiod\n");
1952 wq = alloc_workqueue("nfsiod", WQ_MEM_RECLAIM, 0);
1953 if (wq == NULL)
1954 return -ENOMEM;
1955 nfsiod_workqueue = wq;
1956 return 0;
1957 }
1958
1959 /*
1960 * Destroy the nfsiod workqueue
1961 */
1962 static void nfsiod_stop(void)
1963 {
1964 struct workqueue_struct *wq;
1965
1966 wq = nfsiod_workqueue;
1967 if (wq == NULL)
1968 return;
1969 nfsiod_workqueue = NULL;
1970 destroy_workqueue(wq);
1971 }
1972
1973 int nfs_net_id;
1974 EXPORT_SYMBOL_GPL(nfs_net_id);
1975
1976 static int nfs_net_init(struct net *net)
1977 {
1978 nfs_clients_init(net);
1979 return nfs_fs_proc_net_init(net);
1980 }
1981
1982 static void nfs_net_exit(struct net *net)
1983 {
1984 nfs_fs_proc_net_exit(net);
1985 nfs_cleanup_cb_ident_idr(net);
1986 }
1987
1988 static struct pernet_operations nfs_net_ops = {
1989 .init = nfs_net_init,
1990 .exit = nfs_net_exit,
1991 .id = &nfs_net_id,
1992 .size = sizeof(struct nfs_net),
1993 };
1994
1995 /*
1996 * Initialize NFS
1997 */
1998 static int __init init_nfs_fs(void)
1999 {
2000 int err;
2001
2002 err = register_pernet_subsys(&nfs_net_ops);
2003 if (err < 0)
2004 goto out9;
2005
2006 err = nfs_fscache_register();
2007 if (err < 0)
2008 goto out8;
2009
2010 err = nfsiod_start();
2011 if (err)
2012 goto out7;
2013
2014 err = nfs_fs_proc_init();
2015 if (err)
2016 goto out6;
2017
2018 err = nfs_init_nfspagecache();
2019 if (err)
2020 goto out5;
2021
2022 err = nfs_init_inodecache();
2023 if (err)
2024 goto out4;
2025
2026 err = nfs_init_readpagecache();
2027 if (err)
2028 goto out3;
2029
2030 err = nfs_init_writepagecache();
2031 if (err)
2032 goto out2;
2033
2034 err = nfs_init_directcache();
2035 if (err)
2036 goto out1;
2037
2038 #ifdef CONFIG_PROC_FS
2039 rpc_proc_register(&init_net, &nfs_rpcstat);
2040 #endif
2041 if ((err = register_nfs_fs()) != 0)
2042 goto out0;
2043
2044 return 0;
2045 out0:
2046 #ifdef CONFIG_PROC_FS
2047 rpc_proc_unregister(&init_net, "nfs");
2048 #endif
2049 nfs_destroy_directcache();
2050 out1:
2051 nfs_destroy_writepagecache();
2052 out2:
2053 nfs_destroy_readpagecache();
2054 out3:
2055 nfs_destroy_inodecache();
2056 out4:
2057 nfs_destroy_nfspagecache();
2058 out5:
2059 nfs_fs_proc_exit();
2060 out6:
2061 nfsiod_stop();
2062 out7:
2063 nfs_fscache_unregister();
2064 out8:
2065 unregister_pernet_subsys(&nfs_net_ops);
2066 out9:
2067 return err;
2068 }
2069
2070 static void __exit exit_nfs_fs(void)
2071 {
2072 nfs_destroy_directcache();
2073 nfs_destroy_writepagecache();
2074 nfs_destroy_readpagecache();
2075 nfs_destroy_inodecache();
2076 nfs_destroy_nfspagecache();
2077 nfs_fscache_unregister();
2078 unregister_pernet_subsys(&nfs_net_ops);
2079 #ifdef CONFIG_PROC_FS
2080 rpc_proc_unregister(&init_net, "nfs");
2081 #endif
2082 unregister_nfs_fs();
2083 nfs_fs_proc_exit();
2084 nfsiod_stop();
2085 }
2086
2087 /* Not quite true; I just maintain it */
2088 MODULE_AUTHOR("Olaf Kirch <okir@monad.swb.de>");
2089 MODULE_LICENSE("GPL");
2090 module_param(enable_ino64, bool, 0644);
2091
2092 module_init(init_nfs_fs)
2093 module_exit(exit_nfs_fs)
Linux with added FPC-III support