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[WATCHDOG] watchdog miscdevice patch
[linux-2.6/libata-dev.git] / fs / nfsd / export.c
blobf37df46d2eaa5d13042a0557c79a27ff2d510873
1 #define MSNFS /* HACK HACK */
2 /*
3 * linux/fs/nfsd/export.c
4 *
5 * NFS exporting and validation.
6 *
7 * We maintain a list of clients, each of which has a list of
8 * exports. To export an fs to a given client, you first have
9 * to create the client entry with NFSCTL_ADDCLIENT, which
10 * creates a client control block and adds it to the hash
11 * table. Then, you call NFSCTL_EXPORT for each fs.
12 *
13 *
14 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
15 */
16
17 #include <linux/unistd.h>
18 #include <linux/slab.h>
19 #include <linux/sched.h>
20 #include <linux/stat.h>
21 #include <linux/in.h>
22 #include <linux/seq_file.h>
23 #include <linux/syscalls.h>
24 #include <linux/rwsem.h>
25 #include <linux/dcache.h>
26 #include <linux/namei.h>
27 #include <linux/mount.h>
28 #include <linux/hash.h>
29 #include <linux/module.h>
30
31 #include <linux/sunrpc/svc.h>
32 #include <linux/nfsd/nfsd.h>
33 #include <linux/nfsd/nfsfh.h>
34 #include <linux/nfsd/syscall.h>
35 #include <linux/lockd/bind.h>
36
37 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
38 #define NFSD_PARANOIA 1
39
40 typedef struct auth_domain svc_client;
41 typedef struct svc_export svc_export;
42
43 static void exp_do_unexport(svc_export *unexp);
44 static int exp_verify_string(char *cp, int max);
45
46 /*
47 * We have two caches.
48 * One maps client+vfsmnt+dentry to export options - the export map
49 * The other maps client+filehandle-fragment to export options. - the expkey map
50 *
51 * The export options are actually stored in the first map, and the
52 * second map contains a reference to the entry in the first map.
53 */
54
55 #define EXPKEY_HASHBITS 8
56 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
57 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
58 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
59
60 static void expkey_put(struct kref *ref)
61 {
62 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
63
64 if (test_bit(CACHE_VALID, &key->h.flags) &&
65 !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
66 dput(key->ek_dentry);
67 mntput(key->ek_mnt);
68 }
69 auth_domain_put(key->ek_client);
70 kfree(key);
71 }
72
73 static void expkey_request(struct cache_detail *cd,
74 struct cache_head *h,
75 char **bpp, int *blen)
76 {
77 /* client fsidtype \xfsid */
78 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
79 char type[5];
80
81 qword_add(bpp, blen, ek->ek_client->name);
82 snprintf(type, 5, "%d", ek->ek_fsidtype);
83 qword_add(bpp, blen, type);
84 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
85 (*bpp)[-1] = '\n';
86 }
87
88 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
89 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
90 static struct cache_detail svc_expkey_cache;
91
92 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
93 {
94 /* client fsidtype fsid [path] */
95 char *buf;
96 int len;
97 struct auth_domain *dom = NULL;
98 int err;
99 int fsidtype;
100 char *ep;
101 struct svc_expkey key;
102 struct svc_expkey *ek;
103
104 if (mesg[mlen-1] != '\n')
105 return -EINVAL;
106 mesg[mlen-1] = 0;
107
108 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
109 err = -ENOMEM;
110 if (!buf) goto out;
111
112 err = -EINVAL;
113 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
114 goto out;
115
116 err = -ENOENT;
117 dom = auth_domain_find(buf);
118 if (!dom)
119 goto out;
120 dprintk("found domain %s\n", buf);
121
122 err = -EINVAL;
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 goto out;
125 fsidtype = simple_strtoul(buf, &ep, 10);
126 if (*ep)
127 goto out;
128 dprintk("found fsidtype %d\n", fsidtype);
129 if (key_len(fsidtype)==0) /* invalid type */
130 goto out;
131 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
132 goto out;
133 dprintk("found fsid length %d\n", len);
134 if (len != key_len(fsidtype))
135 goto out;
136
137 /* OK, we seem to have a valid key */
138 key.h.flags = 0;
139 key.h.expiry_time = get_expiry(&mesg);
140 if (key.h.expiry_time == 0)
141 goto out;
142
143 key.ek_client = dom;
144 key.ek_fsidtype = fsidtype;
145 memcpy(key.ek_fsid, buf, len);
146
147 ek = svc_expkey_lookup(&key);
148 err = -ENOMEM;
149 if (!ek)
150 goto out;
151
152 /* now we want a pathname, or empty meaning NEGATIVE */
153 err = -EINVAL;
154 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
155 goto out;
156 dprintk("Path seems to be <%s>\n", buf);
157 err = 0;
158 if (len == 0) {
159 set_bit(CACHE_NEGATIVE, &key.h.flags);
160 ek = svc_expkey_update(&key, ek);
161 if (ek)
162 cache_put(&ek->h, &svc_expkey_cache);
163 else err = -ENOMEM;
164 } else {
165 struct nameidata nd;
166 err = path_lookup(buf, 0, &nd);
167 if (err)
168 goto out;
169
170 dprintk("Found the path %s\n", buf);
171 key.ek_mnt = nd.mnt;
172 key.ek_dentry = nd.dentry;
173
174 ek = svc_expkey_update(&key, ek);
175 if (ek)
176 cache_put(&ek->h, &svc_expkey_cache);
177 else
178 err = -ENOMEM;
179 path_release(&nd);
180 }
181 cache_flush();
182 out:
183 if (dom)
184 auth_domain_put(dom);
185 kfree(buf);
186 return err;
187 }
188
189 static int expkey_show(struct seq_file *m,
190 struct cache_detail *cd,
191 struct cache_head *h)
192 {
193 struct svc_expkey *ek ;
194
195 if (h ==NULL) {
196 seq_puts(m, "#domain fsidtype fsid [path]\n");
197 return 0;
198 }
199 ek = container_of(h, struct svc_expkey, h);
200 seq_printf(m, "%s %d 0x%08x", ek->ek_client->name,
201 ek->ek_fsidtype, ek->ek_fsid[0]);
202 if (ek->ek_fsidtype != 1)
203 seq_printf(m, "%08x", ek->ek_fsid[1]);
204 if (ek->ek_fsidtype == 2)
205 seq_printf(m, "%08x", ek->ek_fsid[2]);
206 if (test_bit(CACHE_VALID, &h->flags) &&
207 !test_bit(CACHE_NEGATIVE, &h->flags)) {
208 seq_printf(m, " ");
209 seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
210 }
211 seq_printf(m, "\n");
212 return 0;
213 }
214
215 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
216 {
217 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
218 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
219
220 if (orig->ek_fsidtype != new->ek_fsidtype ||
221 orig->ek_client != new->ek_client ||
222 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
223 return 0;
224 return 1;
225 }
226
227 static inline void expkey_init(struct cache_head *cnew,
228 struct cache_head *citem)
229 {
230 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
231 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
232
233 kref_get(&item->ek_client->ref);
234 new->ek_client = item->ek_client;
235 new->ek_fsidtype = item->ek_fsidtype;
236 new->ek_fsid[0] = item->ek_fsid[0];
237 new->ek_fsid[1] = item->ek_fsid[1];
238 new->ek_fsid[2] = item->ek_fsid[2];
239 }
240
241 static inline void expkey_update(struct cache_head *cnew,
242 struct cache_head *citem)
243 {
244 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
245 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
246
247 new->ek_mnt = mntget(item->ek_mnt);
248 new->ek_dentry = dget(item->ek_dentry);
249 }
250
251 static struct cache_head *expkey_alloc(void)
252 {
253 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
254 if (i)
255 return &i->h;
256 else
257 return NULL;
258 }
259
260 static struct cache_detail svc_expkey_cache = {
261 .owner = THIS_MODULE,
262 .hash_size = EXPKEY_HASHMAX,
263 .hash_table = expkey_table,
264 .name = "nfsd.fh",
265 .cache_put = expkey_put,
266 .cache_request = expkey_request,
267 .cache_parse = expkey_parse,
268 .cache_show = expkey_show,
269 .match = expkey_match,
270 .init = expkey_init,
271 .update = expkey_update,
272 .alloc = expkey_alloc,
273 };
274
275 static struct svc_expkey *
276 svc_expkey_lookup(struct svc_expkey *item)
277 {
278 struct cache_head *ch;
279 int hash = item->ek_fsidtype;
280 char * cp = (char*)item->ek_fsid;
281 int len = key_len(item->ek_fsidtype);
282
283 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
284 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
285 hash &= EXPKEY_HASHMASK;
286
287 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
288 hash);
289 if (ch)
290 return container_of(ch, struct svc_expkey, h);
291 else
292 return NULL;
293 }
294
295 static struct svc_expkey *
296 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
297 {
298 struct cache_head *ch;
299 int hash = new->ek_fsidtype;
300 char * cp = (char*)new->ek_fsid;
301 int len = key_len(new->ek_fsidtype);
302
303 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
304 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
305 hash &= EXPKEY_HASHMASK;
306
307 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
308 &old->h, hash);
309 if (ch)
310 return container_of(ch, struct svc_expkey, h);
311 else
312 return NULL;
313 }
314
315
316 #define EXPORT_HASHBITS 8
317 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
318 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
319
320 static struct cache_head *export_table[EXPORT_HASHMAX];
321
322 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
323 {
324 int i;
325
326 for (i = 0; i < fsloc->locations_count; i++) {
327 kfree(fsloc->locations[i].path);
328 kfree(fsloc->locations[i].hosts);
329 }
330 kfree(fsloc->locations);
331 }
332
333 static void svc_export_put(struct kref *ref)
334 {
335 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
336 dput(exp->ex_dentry);
337 mntput(exp->ex_mnt);
338 auth_domain_put(exp->ex_client);
339 kfree(exp->ex_path);
340 nfsd4_fslocs_free(&exp->ex_fslocs);
341 kfree(exp);
342 }
343
344 static void svc_export_request(struct cache_detail *cd,
345 struct cache_head *h,
346 char **bpp, int *blen)
347 {
348 /* client path */
349 struct svc_export *exp = container_of(h, struct svc_export, h);
350 char *pth;
351
352 qword_add(bpp, blen, exp->ex_client->name);
353 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
354 if (IS_ERR(pth)) {
355 /* is this correct? */
356 (*bpp)[0] = '\n';
357 return;
358 }
359 qword_add(bpp, blen, pth);
360 (*bpp)[-1] = '\n';
361 }
362
363 static struct svc_export *svc_export_update(struct svc_export *new,
364 struct svc_export *old);
365 static struct svc_export *svc_export_lookup(struct svc_export *);
366
367 static int check_export(struct inode *inode, int flags)
368 {
369
370 /* We currently export only dirs and regular files.
371 * This is what umountd does.
372 */
373 if (!S_ISDIR(inode->i_mode) &&
374 !S_ISREG(inode->i_mode))
375 return -ENOTDIR;
376
377 /* There are two requirements on a filesystem to be exportable.
378 * 1: We must be able to identify the filesystem from a number.
379 * either a device number (so FS_REQUIRES_DEV needed)
380 * or an FSID number (so NFSEXP_FSID needed).
381 * 2: We must be able to find an inode from a filehandle.
382 * This means that s_export_op must be set.
383 */
384 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
385 !(flags & NFSEXP_FSID)) {
386 dprintk("exp_export: export of non-dev fs without fsid\n");
387 return -EINVAL;
388 }
389 if (!inode->i_sb->s_export_op) {
390 dprintk("exp_export: export of invalid fs type.\n");
391 return -EINVAL;
392 }
393
394 /* Ok, we can export it */;
395 if (!inode->i_sb->s_export_op->find_exported_dentry)
396 inode->i_sb->s_export_op->find_exported_dentry =
397 find_exported_dentry;
398 return 0;
399
400 }
401
402 #ifdef CONFIG_NFSD_V4
403
404 static int
405 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
406 {
407 int len;
408 int migrated, i, err;
409
410 len = qword_get(mesg, buf, PAGE_SIZE);
411 if (len != 5 || memcmp(buf, "fsloc", 5))
412 return 0;
413
414 /* listsize */
415 err = get_int(mesg, &fsloc->locations_count);
416 if (err)
417 return err;
418 if (fsloc->locations_count > MAX_FS_LOCATIONS)
419 return -EINVAL;
420 if (fsloc->locations_count == 0)
421 return 0;
422
423 fsloc->locations = kzalloc(fsloc->locations_count
424 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
425 if (!fsloc->locations)
426 return -ENOMEM;
427 for (i=0; i < fsloc->locations_count; i++) {
428 /* colon separated host list */
429 err = -EINVAL;
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].hosts)
436 goto out_free_all;
437 err = -EINVAL;
438 /* slash separated path component list */
439 len = qword_get(mesg, buf, PAGE_SIZE);
440 if (len <= 0)
441 goto out_free_all;
442 err = -ENOMEM;
443 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
444 if (!fsloc->locations[i].path)
445 goto out_free_all;
446 }
447 /* migrated */
448 err = get_int(mesg, &migrated);
449 if (err)
450 goto out_free_all;
451 err = -EINVAL;
452 if (migrated < 0 || migrated > 1)
453 goto out_free_all;
454 fsloc->migrated = migrated;
455 return 0;
456 out_free_all:
457 nfsd4_fslocs_free(fsloc);
458 return err;
459 }
460
461 #else /* CONFIG_NFSD_V4 */
462 static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; }
463 #endif
464
465 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
466 {
467 /* client path expiry [flags anonuid anongid fsid] */
468 char *buf;
469 int len;
470 int err;
471 struct auth_domain *dom = NULL;
472 struct nameidata nd;
473 struct svc_export exp, *expp;
474 int an_int;
475
476 nd.dentry = NULL;
477 exp.ex_path = NULL;
478
479 if (mesg[mlen-1] != '\n')
480 return -EINVAL;
481 mesg[mlen-1] = 0;
482
483 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
484 err = -ENOMEM;
485 if (!buf) goto out;
486
487 /* client */
488 len = qword_get(&mesg, buf, PAGE_SIZE);
489 err = -EINVAL;
490 if (len <= 0) goto out;
491
492 err = -ENOENT;
493 dom = auth_domain_find(buf);
494 if (!dom)
495 goto out;
496
497 /* path */
498 err = -EINVAL;
499 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
500 goto out;
501 err = path_lookup(buf, 0, &nd);
502 if (err) goto out_no_path;
503
504 exp.h.flags = 0;
505 exp.ex_client = dom;
506 exp.ex_mnt = nd.mnt;
507 exp.ex_dentry = nd.dentry;
508 exp.ex_path = kstrdup(buf, GFP_KERNEL);
509 err = -ENOMEM;
510 if (!exp.ex_path)
511 goto out;
512
513 /* expiry */
514 err = -EINVAL;
515 exp.h.expiry_time = get_expiry(&mesg);
516 if (exp.h.expiry_time == 0)
517 goto out;
518
519 /* fs locations */
520 exp.ex_fslocs.locations = NULL;
521 exp.ex_fslocs.locations_count = 0;
522 exp.ex_fslocs.migrated = 0;
523
524 /* flags */
525 err = get_int(&mesg, &an_int);
526 if (err == -ENOENT)
527 set_bit(CACHE_NEGATIVE, &exp.h.flags);
528 else {
529 if (err || an_int < 0) goto out;
530 exp.ex_flags= an_int;
531
532 /* anon uid */
533 err = get_int(&mesg, &an_int);
534 if (err) goto out;
535 exp.ex_anon_uid= an_int;
536
537 /* anon gid */
538 err = get_int(&mesg, &an_int);
539 if (err) goto out;
540 exp.ex_anon_gid= an_int;
541
542 /* fsid */
543 err = get_int(&mesg, &an_int);
544 if (err) goto out;
545 exp.ex_fsid = an_int;
546
547 err = check_export(nd.dentry->d_inode, exp.ex_flags);
548 if (err) goto out;
549
550 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
551 if (err)
552 goto out;
553 }
554
555 expp = svc_export_lookup(&exp);
556 if (expp)
557 expp = svc_export_update(&exp, expp);
558 else
559 err = -ENOMEM;
560 cache_flush();
561 if (expp == NULL)
562 err = -ENOMEM;
563 else
564 exp_put(expp);
565 out:
566 kfree(exp.ex_path);
567 if (nd.dentry)
568 path_release(&nd);
569 out_no_path:
570 if (dom)
571 auth_domain_put(dom);
572 kfree(buf);
573 return err;
574 }
575
576 static void exp_flags(struct seq_file *m, int flag, int fsid,
577 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
578
579 static int svc_export_show(struct seq_file *m,
580 struct cache_detail *cd,
581 struct cache_head *h)
582 {
583 struct svc_export *exp ;
584
585 if (h ==NULL) {
586 seq_puts(m, "#path domain(flags)\n");
587 return 0;
588 }
589 exp = container_of(h, struct svc_export, h);
590 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
591 seq_putc(m, '\t');
592 seq_escape(m, exp->ex_client->name, " \t\n\\");
593 seq_putc(m, '(');
594 if (test_bit(CACHE_VALID, &h->flags) &&
595 !test_bit(CACHE_NEGATIVE, &h->flags))
596 exp_flags(m, exp->ex_flags, exp->ex_fsid,
597 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
598 seq_puts(m, ")\n");
599 return 0;
600 }
601 static int svc_export_match(struct cache_head *a, struct cache_head *b)
602 {
603 struct svc_export *orig = container_of(a, struct svc_export, h);
604 struct svc_export *new = container_of(b, struct svc_export, h);
605 return orig->ex_client == new->ex_client &&
606 orig->ex_dentry == new->ex_dentry &&
607 orig->ex_mnt == new->ex_mnt;
608 }
609
610 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
611 {
612 struct svc_export *new = container_of(cnew, struct svc_export, h);
613 struct svc_export *item = container_of(citem, struct svc_export, h);
614
615 kref_get(&item->ex_client->ref);
616 new->ex_client = item->ex_client;
617 new->ex_dentry = dget(item->ex_dentry);
618 new->ex_mnt = mntget(item->ex_mnt);
619 new->ex_path = NULL;
620 new->ex_fslocs.locations = NULL;
621 new->ex_fslocs.locations_count = 0;
622 new->ex_fslocs.migrated = 0;
623 }
624
625 static void export_update(struct cache_head *cnew, struct cache_head *citem)
626 {
627 struct svc_export *new = container_of(cnew, struct svc_export, h);
628 struct svc_export *item = container_of(citem, struct svc_export, h);
629
630 new->ex_flags = item->ex_flags;
631 new->ex_anon_uid = item->ex_anon_uid;
632 new->ex_anon_gid = item->ex_anon_gid;
633 new->ex_fsid = item->ex_fsid;
634 new->ex_path = item->ex_path;
635 item->ex_path = NULL;
636 new->ex_fslocs.locations = item->ex_fslocs.locations;
637 item->ex_fslocs.locations = NULL;
638 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
639 item->ex_fslocs.locations_count = 0;
640 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
641 item->ex_fslocs.migrated = 0;
642 }
643
644 static struct cache_head *svc_export_alloc(void)
645 {
646 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
647 if (i)
648 return &i->h;
649 else
650 return NULL;
651 }
652
653 struct cache_detail svc_export_cache = {
654 .owner = THIS_MODULE,
655 .hash_size = EXPORT_HASHMAX,
656 .hash_table = export_table,
657 .name = "nfsd.export",
658 .cache_put = svc_export_put,
659 .cache_request = svc_export_request,
660 .cache_parse = svc_export_parse,
661 .cache_show = svc_export_show,
662 .match = svc_export_match,
663 .init = svc_export_init,
664 .update = export_update,
665 .alloc = svc_export_alloc,
666 };
667
668 static struct svc_export *
669 svc_export_lookup(struct svc_export *exp)
670 {
671 struct cache_head *ch;
672 int hash;
673 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
674 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
675 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
676
677 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
678 hash);
679 if (ch)
680 return container_of(ch, struct svc_export, h);
681 else
682 return NULL;
683 }
684
685 static struct svc_export *
686 svc_export_update(struct svc_export *new, struct svc_export *old)
687 {
688 struct cache_head *ch;
689 int hash;
690 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
691 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
692 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
693
694 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
695 &old->h,
696 hash);
697 if (ch)
698 return container_of(ch, struct svc_export, h);
699 else
700 return NULL;
701 }
702
703
704 static struct svc_expkey *
705 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
706 {
707 struct svc_expkey key, *ek;
708 int err;
709
710 if (!clp)
711 return NULL;
712
713 key.ek_client = clp;
714 key.ek_fsidtype = fsid_type;
715 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
716
717 ek = svc_expkey_lookup(&key);
718 if (ek != NULL)
719 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
720 ek = ERR_PTR(err);
721 return ek;
722 }
723
724 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
725 struct svc_export *exp)
726 {
727 struct svc_expkey key, *ek;
728
729 key.ek_client = clp;
730 key.ek_fsidtype = fsid_type;
731 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
732 key.ek_mnt = exp->ex_mnt;
733 key.ek_dentry = exp->ex_dentry;
734 key.h.expiry_time = NEVER;
735 key.h.flags = 0;
736
737 ek = svc_expkey_lookup(&key);
738 if (ek)
739 ek = svc_expkey_update(&key,ek);
740 if (ek) {
741 cache_put(&ek->h, &svc_expkey_cache);
742 return 0;
743 }
744 return -ENOMEM;
745 }
746
747 /*
748 * Find the client's export entry matching xdev/xino.
749 */
750 static inline struct svc_expkey *
751 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
752 {
753 u32 fsidv[3];
754
755 if (old_valid_dev(dev)) {
756 mk_fsid_v0(fsidv, dev, ino);
757 return exp_find_key(clp, 0, fsidv, NULL);
758 }
759 mk_fsid_v3(fsidv, dev, ino);
760 return exp_find_key(clp, 3, fsidv, NULL);
761 }
762
763 /*
764 * Find the client's export entry matching fsid
765 */
766 static inline struct svc_expkey *
767 exp_get_fsid_key(svc_client *clp, int fsid)
768 {
769 u32 fsidv[2];
770
771 mk_fsid_v1(fsidv, fsid);
772
773 return exp_find_key(clp, 1, fsidv, NULL);
774 }
775
776 svc_export *
777 exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
778 struct cache_req *reqp)
779 {
780 struct svc_export *exp, key;
781
782 if (!clp)
783 return NULL;
784
785 key.ex_client = clp;
786 key.ex_mnt = mnt;
787 key.ex_dentry = dentry;
788
789 exp = svc_export_lookup(&key);
790 if (exp != NULL)
791 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
792 case 0: break;
793 case -EAGAIN:
794 exp = ERR_PTR(-EAGAIN);
795 break;
796 default:
797 exp = NULL;
798 }
799
800 return exp;
801 }
802
803 /*
804 * Find the export entry for a given dentry.
805 */
806 struct svc_export *
807 exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
808 struct cache_req *reqp)
809 {
810 svc_export *exp;
811
812 dget(dentry);
813 exp = exp_get_by_name(clp, mnt, dentry, reqp);
814
815 while (exp == NULL && !IS_ROOT(dentry)) {
816 struct dentry *parent;
817
818 parent = dget_parent(dentry);
819 dput(dentry);
820 dentry = parent;
821 exp = exp_get_by_name(clp, mnt, dentry, reqp);
822 }
823 dput(dentry);
824 return exp;
825 }
826
827 /*
828 * Hashtable locking. Write locks are placed only by user processes
829 * wanting to modify export information.
830 * Write locking only done in this file. Read locking
831 * needed externally.
832 */
833
834 static DECLARE_RWSEM(hash_sem);
835
836 void
837 exp_readlock(void)
838 {
839 down_read(&hash_sem);
840 }
841
842 static inline void
843 exp_writelock(void)
844 {
845 down_write(&hash_sem);
846 }
847
848 void
849 exp_readunlock(void)
850 {
851 up_read(&hash_sem);
852 }
853
854 static inline void
855 exp_writeunlock(void)
856 {
857 up_write(&hash_sem);
858 }
859
860 static void exp_fsid_unhash(struct svc_export *exp)
861 {
862 struct svc_expkey *ek;
863
864 if ((exp->ex_flags & NFSEXP_FSID) == 0)
865 return;
866
867 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
868 if (ek && !IS_ERR(ek)) {
869 ek->h.expiry_time = get_seconds()-1;
870 cache_put(&ek->h, &svc_expkey_cache);
871 }
872 svc_expkey_cache.nextcheck = get_seconds();
873 }
874
875 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
876 {
877 u32 fsid[2];
878
879 if ((exp->ex_flags & NFSEXP_FSID) == 0)
880 return 0;
881
882 mk_fsid_v1(fsid, exp->ex_fsid);
883 return exp_set_key(clp, 1, fsid, exp);
884 }
885
886 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
887 {
888 u32 fsid[2];
889 struct inode *inode = exp->ex_dentry->d_inode;
890 dev_t dev = inode->i_sb->s_dev;
891
892 if (old_valid_dev(dev)) {
893 mk_fsid_v0(fsid, dev, inode->i_ino);
894 return exp_set_key(clp, 0, fsid, exp);
895 }
896 mk_fsid_v3(fsid, dev, inode->i_ino);
897 return exp_set_key(clp, 3, fsid, exp);
898 }
899
900 static void exp_unhash(struct svc_export *exp)
901 {
902 struct svc_expkey *ek;
903 struct inode *inode = exp->ex_dentry->d_inode;
904
905 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
906 if (ek && !IS_ERR(ek)) {
907 ek->h.expiry_time = get_seconds()-1;
908 cache_put(&ek->h, &svc_expkey_cache);
909 }
910 svc_expkey_cache.nextcheck = get_seconds();
911 }
912
913 /*
914 * Export a file system.
915 */
916 int
917 exp_export(struct nfsctl_export *nxp)
918 {
919 svc_client *clp;
920 struct svc_export *exp = NULL;
921 struct svc_export new;
922 struct svc_expkey *fsid_key = NULL;
923 struct nameidata nd;
924 int err;
925
926 /* Consistency check */
927 err = -EINVAL;
928 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
929 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
930 goto out;
931
932 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
933 nxp->ex_client, nxp->ex_path,
934 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
935 nxp->ex_flags);
936
937 /* Try to lock the export table for update */
938 exp_writelock();
939
940 /* Look up client info */
941 if (!(clp = auth_domain_find(nxp->ex_client)))
942 goto out_unlock;
943
944
945 /* Look up the dentry */
946 err = path_lookup(nxp->ex_path, 0, &nd);
947 if (err)
948 goto out_unlock;
949 err = -EINVAL;
950
951 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
952
953 /* must make sure there won't be an ex_fsid clash */
954 if ((nxp->ex_flags & NFSEXP_FSID) &&
955 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
956 !IS_ERR(fsid_key) &&
957 fsid_key->ek_mnt &&
958 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
959 goto finish;
960
961 if (exp) {
962 /* just a flags/id/fsid update */
963
964 exp_fsid_unhash(exp);
965 exp->ex_flags = nxp->ex_flags;
966 exp->ex_anon_uid = nxp->ex_anon_uid;
967 exp->ex_anon_gid = nxp->ex_anon_gid;
968 exp->ex_fsid = nxp->ex_dev;
969
970 err = exp_fsid_hash(clp, exp);
971 goto finish;
972 }
973
974 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
975 if (err) goto finish;
976
977 err = -ENOMEM;
978
979 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
980
981 new.h.expiry_time = NEVER;
982 new.h.flags = 0;
983 new.ex_client = clp;
984 new.ex_mnt = nd.mnt;
985 new.ex_dentry = nd.dentry;
986 new.ex_flags = nxp->ex_flags;
987 new.ex_anon_uid = nxp->ex_anon_uid;
988 new.ex_anon_gid = nxp->ex_anon_gid;
989 new.ex_fsid = nxp->ex_dev;
990
991 exp = svc_export_lookup(&new);
992 if (exp)
993 exp = svc_export_update(&new, exp);
994
995 if (!exp)
996 goto finish;
997
998 if (exp_hash(clp, exp) ||
999 exp_fsid_hash(clp, exp)) {
1000 /* failed to create at least one index */
1001 exp_do_unexport(exp);
1002 cache_flush();
1003 err = -ENOMEM;
1004 }
1005
1006 finish:
1007 if (exp)
1008 exp_put(exp);
1009 if (fsid_key && !IS_ERR(fsid_key))
1010 cache_put(&fsid_key->h, &svc_expkey_cache);
1011 if (clp)
1012 auth_domain_put(clp);
1013 path_release(&nd);
1014 out_unlock:
1015 exp_writeunlock();
1016 out:
1017 return err;
1018 }
1019
1020 /*
1021 * Unexport a file system. The export entry has already
1022 * been removed from the client's list of exported fs's.
1023 */
1024 static void
1025 exp_do_unexport(svc_export *unexp)
1026 {
1027 unexp->h.expiry_time = get_seconds()-1;
1028 svc_export_cache.nextcheck = get_seconds();
1029 exp_unhash(unexp);
1030 exp_fsid_unhash(unexp);
1031 }
1032
1033
1034 /*
1035 * unexport syscall.
1036 */
1037 int
1038 exp_unexport(struct nfsctl_export *nxp)
1039 {
1040 struct auth_domain *dom;
1041 svc_export *exp;
1042 struct nameidata nd;
1043 int err;
1044
1045 /* Consistency check */
1046 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1047 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1048 return -EINVAL;
1049
1050 exp_writelock();
1051
1052 err = -EINVAL;
1053 dom = auth_domain_find(nxp->ex_client);
1054 if (!dom) {
1055 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1056 goto out_unlock;
1057 }
1058
1059 err = path_lookup(nxp->ex_path, 0, &nd);
1060 if (err)
1061 goto out_domain;
1062
1063 err = -EINVAL;
1064 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
1065 path_release(&nd);
1066 if (!exp)
1067 goto out_domain;
1068
1069 exp_do_unexport(exp);
1070 exp_put(exp);
1071 err = 0;
1072
1073 out_domain:
1074 auth_domain_put(dom);
1075 cache_flush();
1076 out_unlock:
1077 exp_writeunlock();
1078 return err;
1079 }
1080
1081 /*
1082 * Obtain the root fh on behalf of a client.
1083 * This could be done in user space, but I feel that it adds some safety
1084 * since its harder to fool a kernel module than a user space program.
1085 */
1086 int
1087 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1088 {
1089 struct svc_export *exp;
1090 struct nameidata nd;
1091 struct inode *inode;
1092 struct svc_fh fh;
1093 int err;
1094
1095 err = -EPERM;
1096 /* NB: we probably ought to check that it's NUL-terminated */
1097 if (path_lookup(path, 0, &nd)) {
1098 printk("nfsd: exp_rootfh path not found %s", path);
1099 return err;
1100 }
1101 inode = nd.dentry->d_inode;
1102
1103 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1104 path, nd.dentry, clp->name,
1105 inode->i_sb->s_id, inode->i_ino);
1106 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
1107 if (!exp) {
1108 dprintk("nfsd: exp_rootfh export not found.\n");
1109 goto out;
1110 }
1111
1112 /*
1113 * fh must be initialized before calling fh_compose
1114 */
1115 fh_init(&fh, maxsize);
1116 if (fh_compose(&fh, exp, nd.dentry, NULL))
1117 err = -EINVAL;
1118 else
1119 err = 0;
1120 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1121 fh_put(&fh);
1122 exp_put(exp);
1123 out:
1124 path_release(&nd);
1125 return err;
1126 }
1127
1128 struct svc_export *
1129 exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1130 struct cache_req *reqp)
1131 {
1132 struct svc_export *exp;
1133 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1134 if (!ek || IS_ERR(ek))
1135 return ERR_PTR(PTR_ERR(ek));
1136
1137 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
1138 cache_put(&ek->h, &svc_expkey_cache);
1139
1140 if (!exp || IS_ERR(exp))
1141 return ERR_PTR(PTR_ERR(exp));
1142 return exp;
1143 }
1144
1145
1146 /*
1147 * Called when we need the filehandle for the root of the pseudofs,
1148 * for a given NFSv4 client. The root is defined to be the
1149 * export point with fsid==0
1150 */
1151 __be32
1152 exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1153 struct cache_req *creq)
1154 {
1155 struct svc_export *exp;
1156 __be32 rv;
1157 u32 fsidv[2];
1158
1159 mk_fsid_v1(fsidv, 0);
1160
1161 exp = exp_find(clp, 1, fsidv, creq);
1162 if (IS_ERR(exp) && PTR_ERR(exp) == -EAGAIN)
1163 return nfserr_dropit;
1164 if (exp == NULL)
1165 return nfserr_perm;
1166 else if (IS_ERR(exp))
1167 return nfserrno(PTR_ERR(exp));
1168 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1169 exp_put(exp);
1170 return rv;
1171 }
1172
1173 /* Iterator */
1174
1175 static void *e_start(struct seq_file *m, loff_t *pos)
1176 __acquires(svc_export_cache.hash_lock)
1177 {
1178 loff_t n = *pos;
1179 unsigned hash, export;
1180 struct cache_head *ch;
1181
1182 exp_readlock();
1183 read_lock(&svc_export_cache.hash_lock);
1184 if (!n--)
1185 return SEQ_START_TOKEN;
1186 hash = n >> 32;
1187 export = n & ((1LL<<32) - 1);
1188
1189
1190 for (ch=export_table[hash]; ch; ch=ch->next)
1191 if (!export--)
1192 return ch;
1193 n &= ~((1LL<<32) - 1);
1194 do {
1195 hash++;
1196 n += 1LL<<32;
1197 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1198 if (hash >= EXPORT_HASHMAX)
1199 return NULL;
1200 *pos = n+1;
1201 return export_table[hash];
1202 }
1203
1204 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1205 {
1206 struct cache_head *ch = p;
1207 int hash = (*pos >> 32);
1208
1209 if (p == SEQ_START_TOKEN)
1210 hash = 0;
1211 else if (ch->next == NULL) {
1212 hash++;
1213 *pos += 1LL<<32;
1214 } else {
1215 ++*pos;
1216 return ch->next;
1217 }
1218 *pos &= ~((1LL<<32) - 1);
1219 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1220 hash++;
1221 *pos += 1LL<<32;
1222 }
1223 if (hash >= EXPORT_HASHMAX)
1224 return NULL;
1225 ++*pos;
1226 return export_table[hash];
1227 }
1228
1229 static void e_stop(struct seq_file *m, void *p)
1230 __releases(svc_export_cache.hash_lock)
1231 {
1232 read_unlock(&svc_export_cache.hash_lock);
1233 exp_readunlock();
1234 }
1235
1236 static struct flags {
1237 int flag;
1238 char *name[2];
1239 } expflags[] = {
1240 { NFSEXP_READONLY, {"ro", "rw"}},
1241 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1242 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1243 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1244 { NFSEXP_ASYNC, {"async", "sync"}},
1245 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1246 { NFSEXP_NOHIDE, {"nohide", ""}},
1247 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1248 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1249 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1250 #ifdef MSNFS
1251 { NFSEXP_MSNFS, {"msnfs", ""}},
1252 #endif
1253 { 0, {"", ""}}
1254 };
1255
1256 static void exp_flags(struct seq_file *m, int flag, int fsid,
1257 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1258 {
1259 int first = 0;
1260 struct flags *flg;
1261
1262 for (flg = expflags; flg->flag; flg++) {
1263 int state = (flg->flag & flag)?0:1;
1264 if (*flg->name[state])
1265 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1266 }
1267 if (flag & NFSEXP_FSID)
1268 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1269 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1270 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1271 if (anong != (gid_t)-2 && anong != (0x10000-2))
1272 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1273 if (fsloc && fsloc->locations_count > 0) {
1274 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1275 int i;
1276
1277 seq_printf(m, "%s%s=", first++?",":"", loctype);
1278 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1279 seq_putc(m, '@');
1280 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1281 for (i = 1; i < fsloc->locations_count; i++) {
1282 seq_putc(m, ';');
1283 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1284 seq_putc(m, '@');
1285 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1286 }
1287 }
1288 }
1289
1290 static int e_show(struct seq_file *m, void *p)
1291 {
1292 struct cache_head *cp = p;
1293 struct svc_export *exp = container_of(cp, struct svc_export, h);
1294
1295 if (p == SEQ_START_TOKEN) {
1296 seq_puts(m, "# Version 1.1\n");
1297 seq_puts(m, "# Path Client(Flags) # IPs\n");
1298 return 0;
1299 }
1300
1301 cache_get(&exp->h);
1302 if (cache_check(&svc_export_cache, &exp->h, NULL))
1303 return 0;
1304 cache_put(&exp->h, &svc_export_cache);
1305 return svc_export_show(m, &svc_export_cache, cp);
1306 }
1307
1308 struct seq_operations nfs_exports_op = {
1309 .start = e_start,
1310 .next = e_next,
1311 .stop = e_stop,
1312 .show = e_show,
1313 };
1314
1315 /*
1316 * Add or modify a client.
1317 * Change requests may involve the list of host addresses. The list of
1318 * exports and possibly existing uid maps are left untouched.
1319 */
1320 int
1321 exp_addclient(struct nfsctl_client *ncp)
1322 {
1323 struct auth_domain *dom;
1324 int i, err;
1325
1326 /* First, consistency check. */
1327 err = -EINVAL;
1328 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1329 goto out;
1330 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1331 goto out;
1332
1333 /* Lock the hashtable */
1334 exp_writelock();
1335
1336 dom = unix_domain_find(ncp->cl_ident);
1337
1338 err = -ENOMEM;
1339 if (!dom)
1340 goto out_unlock;
1341
1342 /* Insert client into hashtable. */
1343 for (i = 0; i < ncp->cl_naddr; i++)
1344 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1345
1346 auth_unix_forget_old(dom);
1347 auth_domain_put(dom);
1348
1349 err = 0;
1350
1351 out_unlock:
1352 exp_writeunlock();
1353 out:
1354 return err;
1355 }
1356
1357 /*
1358 * Delete a client given an identifier.
1359 */
1360 int
1361 exp_delclient(struct nfsctl_client *ncp)
1362 {
1363 int err;
1364 struct auth_domain *dom;
1365
1366 err = -EINVAL;
1367 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1368 goto out;
1369
1370 /* Lock the hashtable */
1371 exp_writelock();
1372
1373 dom = auth_domain_find(ncp->cl_ident);
1374 /* just make sure that no addresses work
1375 * and that it will expire soon
1376 */
1377 if (dom) {
1378 err = auth_unix_forget_old(dom);
1379 auth_domain_put(dom);
1380 }
1381
1382 exp_writeunlock();
1383 out:
1384 return err;
1385 }
1386
1387 /*
1388 * Verify that string is non-empty and does not exceed max length.
1389 */
1390 static int
1391 exp_verify_string(char *cp, int max)
1392 {
1393 int i;
1394
1395 for (i = 0; i < max; i++)
1396 if (!cp[i])
1397 return i;
1398 cp[i] = 0;
1399 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1400 return 0;
1401 }
1402
1403 /*
1404 * Initialize the exports module.
1405 */
1406 void
1407 nfsd_export_init(void)
1408 {
1409 dprintk("nfsd: initializing export module.\n");
1410
1411 cache_register(&svc_export_cache);
1412 cache_register(&svc_expkey_cache);
1413
1414 }
1415
1416 /*
1417 * Flush exports table - called when last nfsd thread is killed
1418 */
1419 void
1420 nfsd_export_flush(void)
1421 {
1422 exp_writelock();
1423 cache_purge(&svc_expkey_cache);
1424 cache_purge(&svc_export_cache);
1425 exp_writeunlock();
1426 }
1427
1428 /*
1429 * Shutdown the exports module.
1430 */
1431 void
1432 nfsd_export_shutdown(void)
1433 {
1434
1435 dprintk("nfsd: shutting down export module.\n");
1436
1437 exp_writelock();
1438
1439 if (cache_unregister(&svc_expkey_cache))
1440 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1441 if (cache_unregister(&svc_export_cache))
1442 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1443 svcauth_unix_purge();
1444
1445 exp_writeunlock();
1446 dprintk("nfsd: export shutdown complete.\n");
1447 }
Linux 2.6 libata-dev (mirror)