1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * NFS exporting and validation.
4 *
5 * We maintain a list of clients, each of which has a list of
6 * exports. To export an fs to a given client, you first have
7 * to create the client entry with NFSCTL_ADDCLIENT, which
8 * creates a client control block and adds it to the hash
9 * table. Then, you call NFSCTL_EXPORT for each fs.
10 *
11 *
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
13 */
14
15 #include <linux/slab.h>
16 #include <linux/namei.h>
17 #include <linux/module.h>
18 #include <linux/exportfs.h>
19 #include <linux/sunrpc/svc_xprt.h>
20
21 #include "nfsd.h"
22 #include "nfsfh.h"
23 #include "netns.h"
24 #include "pnfs.h"
25 #include "filecache.h"
26 #include "trace.h"
27
28 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
29
30 /*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
34 *
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
37 */
38
39 #define EXPKEY_HASHBITS 8
40 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42
43 static void expkey_put(struct kref *ref)
44 {
45 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
46
47 if (test_bit(CACHE_VALID, &key->h.flags) &&
48 !test_bit(CACHE_NEGATIVE, &key->h.flags))
49 path_put(&key->ek_path);
50 auth_domain_put(key->ek_client);
51 kfree_rcu(key, ek_rcu);
52 }
53
54 static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
55 {
56 return sunrpc_cache_pipe_upcall(cd, h);
57 }
58
59 static void expkey_request(struct cache_detail *cd,
60 struct cache_head *h,
61 char **bpp, int *blen)
62 {
63 /* client fsidtype \xfsid */
64 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
65 char type[5];
66
67 qword_add(bpp, blen, ek->ek_client->name);
68 snprintf(type, 5, "%d", ek->ek_fsidtype);
69 qword_add(bpp, blen, type);
70 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
71 (*bpp)[-1] = '\n';
72 }
73
74 static struct svc_expkey *svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
75 struct svc_expkey *old);
76 static struct svc_expkey *svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *);
77
78 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
79 {
80 /* client fsidtype fsid expiry [path] */
81 char *buf;
82 int len;
83 struct auth_domain *dom = NULL;
84 int err;
85 int fsidtype;
86 char *ep;
87 struct svc_expkey key;
88 struct svc_expkey *ek = NULL;
89
90 if (mesg[mlen - 1] != '\n')
91 return -EINVAL;
92 mesg[mlen-1] = 0;
93
94 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
95 err = -ENOMEM;
96 if (!buf)
97 goto out;
98
99 err = -EINVAL;
100 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
101 goto out;
102
103 err = -ENOENT;
104 dom = auth_domain_find(buf);
105 if (!dom)
106 goto out;
107 dprintk("found domain %s\n", buf);
108
109 err = -EINVAL;
110 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
111 goto out;
112 fsidtype = simple_strtoul(buf, &ep, 10);
113 if (*ep)
114 goto out;
115 dprintk("found fsidtype %d\n", fsidtype);
116 if (key_len(fsidtype)==0) /* invalid type */
117 goto out;
118 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
119 goto out;
120 dprintk("found fsid length %d\n", len);
121 if (len != key_len(fsidtype))
122 goto out;
123
124 /* OK, we seem to have a valid key */
125 key.h.flags = 0;
126 err = get_expiry(&mesg, &key.h.expiry_time);
127 if (err)
128 goto out;
129
130 key.ek_client = dom;
131 key.ek_fsidtype = fsidtype;
132 memcpy(key.ek_fsid, buf, len);
133
134 ek = svc_expkey_lookup(cd, &key);
135 err = -ENOMEM;
136 if (!ek)
137 goto out;
138
139 /* now we want a pathname, or empty meaning NEGATIVE */
140 err = -EINVAL;
141 len = qword_get(&mesg, buf, PAGE_SIZE);
142 if (len < 0)
143 goto out;
144 dprintk("Path seems to be <%s>\n", buf);
145 err = 0;
146 if (len == 0) {
147 set_bit(CACHE_NEGATIVE, &key.h.flags);
148 ek = svc_expkey_update(cd, &key, ek);
149 if (ek)
150 trace_nfsd_expkey_update(ek, NULL);
151 else
152 err = -ENOMEM;
153 } else {
154 err = kern_path(buf, 0, &key.ek_path);
155 if (err)
156 goto out;
157
158 dprintk("Found the path %s\n", buf);
159
160 ek = svc_expkey_update(cd, &key, ek);
161 if (ek)
162 trace_nfsd_expkey_update(ek, buf);
163 else
164 err = -ENOMEM;
165 path_put(&key.ek_path);
166 }
167 cache_flush();
168 out:
169 if (ek)
170 cache_put(&ek->h, cd);
171 if (dom)
172 auth_domain_put(dom);
173 kfree(buf);
174 return err;
175 }
176
177 static int expkey_show(struct seq_file *m,
178 struct cache_detail *cd,
179 struct cache_head *h)
180 {
181 struct svc_expkey *ek ;
182 int i;
183
184 if (h ==NULL) {
185 seq_puts(m, "#domain fsidtype fsid [path]\n");
186 return 0;
187 }
188 ek = container_of(h, struct svc_expkey, h);
189 seq_printf(m, "%s %d 0x", ek->ek_client->name,
190 ek->ek_fsidtype);
191 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
192 seq_printf(m, "%08x", ek->ek_fsid[i]);
193 if (test_bit(CACHE_VALID, &h->flags) &&
194 !test_bit(CACHE_NEGATIVE, &h->flags)) {
195 seq_printf(m, " ");
196 seq_path(m, &ek->ek_path, "\\ \t\n");
197 }
198 seq_printf(m, "\n");
199 return 0;
200 }
201
202 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
203 {
204 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
205 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
206
207 if (orig->ek_fsidtype != new->ek_fsidtype ||
208 orig->ek_client != new->ek_client ||
209 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
210 return 0;
211 return 1;
212 }
213
214 static inline void expkey_init(struct cache_head *cnew,
215 struct cache_head *citem)
216 {
217 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
218 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
219
220 kref_get(&item->ek_client->ref);
221 new->ek_client = item->ek_client;
222 new->ek_fsidtype = item->ek_fsidtype;
223
224 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
225 }
226
227 static inline void expkey_update(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 new->ek_path = item->ek_path;
234 path_get(&item->ek_path);
235 }
236
237 static struct cache_head *expkey_alloc(void)
238 {
239 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
240 if (i)
241 return &i->h;
242 else
243 return NULL;
244 }
245
246 static void expkey_flush(void)
247 {
248 /*
249 * Take the nfsd_mutex here to ensure that the file cache is not
250 * destroyed while we're in the middle of flushing.
251 */
252 mutex_lock(&nfsd_mutex);
253 nfsd_file_cache_purge(current->nsproxy->net_ns);
254 mutex_unlock(&nfsd_mutex);
255 }
256
257 static const struct cache_detail svc_expkey_cache_template = {
258 .owner = THIS_MODULE,
259 .hash_size = EXPKEY_HASHMAX,
260 .name = "nfsd.fh",
261 .cache_put = expkey_put,
262 .cache_upcall = expkey_upcall,
263 .cache_request = expkey_request,
264 .cache_parse = expkey_parse,
265 .cache_show = expkey_show,
266 .match = expkey_match,
267 .init = expkey_init,
268 .update = expkey_update,
269 .alloc = expkey_alloc,
270 .flush = expkey_flush,
271 };
272
273 static int
274 svc_expkey_hash(struct svc_expkey *item)
275 {
276 int hash = item->ek_fsidtype;
277 char * cp = (char*)item->ek_fsid;
278 int len = key_len(item->ek_fsidtype);
279
280 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
281 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
282 hash &= EXPKEY_HASHMASK;
283 return hash;
284 }
285
286 static struct svc_expkey *
287 svc_expkey_lookup(struct cache_detail *cd, struct svc_expkey *item)
288 {
289 struct cache_head *ch;
290 int hash = svc_expkey_hash(item);
291
292 ch = sunrpc_cache_lookup_rcu(cd, &item->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
297 }
298
299 static struct svc_expkey *
300 svc_expkey_update(struct cache_detail *cd, struct svc_expkey *new,
301 struct svc_expkey *old)
302 {
303 struct cache_head *ch;
304 int hash = svc_expkey_hash(new);
305
306 ch = sunrpc_cache_update(cd, &new->h, &old->h, hash);
307 if (ch)
308 return container_of(ch, struct svc_expkey, h);
309 else
310 return NULL;
311 }
312
313
314 #define EXPORT_HASHBITS 8
315 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
316
317 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
318 {
319 struct nfsd4_fs_location *locations = fsloc->locations;
320 int i;
321
322 if (!locations)
323 return;
324
325 for (i = 0; i < fsloc->locations_count; i++) {
326 kfree(locations[i].path);
327 kfree(locations[i].hosts);
328 }
329
330 kfree(locations);
331 fsloc->locations = NULL;
332 }
333
334 static int export_stats_init(struct export_stats *stats)
335 {
336 stats->start_time = ktime_get_seconds();
337 return percpu_counter_init_many(stats->counter, 0, GFP_KERNEL,
338 EXP_STATS_COUNTERS_NUM);
339 }
340
341 static void export_stats_reset(struct export_stats *stats)
342 {
343 if (stats) {
344 int i;
345
346 for (i = 0; i < EXP_STATS_COUNTERS_NUM; i++)
347 percpu_counter_set(&stats->counter[i], 0);
348 }
349 }
350
351 static void export_stats_destroy(struct export_stats *stats)
352 {
353 if (stats)
354 percpu_counter_destroy_many(stats->counter,
355 EXP_STATS_COUNTERS_NUM);
356 }
357
358 static void svc_export_put(struct kref *ref)
359 {
360 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
361 path_put(&exp->ex_path);
362 auth_domain_put(exp->ex_client);
363 nfsd4_fslocs_free(&exp->ex_fslocs);
364 export_stats_destroy(exp->ex_stats);
365 kfree(exp->ex_stats);
366 kfree(exp->ex_uuid);
367 kfree_rcu(exp, ex_rcu);
368 }
369
370 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
371 {
372 return sunrpc_cache_pipe_upcall(cd, h);
373 }
374
375 static void svc_export_request(struct cache_detail *cd,
376 struct cache_head *h,
377 char **bpp, int *blen)
378 {
379 /* client path */
380 struct svc_export *exp = container_of(h, struct svc_export, h);
381 char *pth;
382
383 qword_add(bpp, blen, exp->ex_client->name);
384 pth = d_path(&exp->ex_path, *bpp, *blen);
385 if (IS_ERR(pth)) {
386 /* is this correct? */
387 (*bpp)[0] = '\n';
388 return;
389 }
390 qword_add(bpp, blen, pth);
391 (*bpp)[-1] = '\n';
392 }
393
394 static struct svc_export *svc_export_update(struct svc_export *new,
395 struct svc_export *old);
396 static struct svc_export *svc_export_lookup(struct svc_export *);
397
398 static int check_export(struct path *path, int *flags, unsigned char *uuid)
399 {
400 struct inode *inode = d_inode(path->dentry);
401
402 /*
403 * We currently export only dirs, regular files, and (for v4
404 * pseudoroot) symlinks.
405 */
406 if (!S_ISDIR(inode->i_mode) &&
407 !S_ISLNK(inode->i_mode) &&
408 !S_ISREG(inode->i_mode))
409 return -ENOTDIR;
410
411 /*
412 * Mountd should never pass down a writeable V4ROOT export, but,
413 * just to make sure:
414 */
415 if (*flags & NFSEXP_V4ROOT)
416 *flags |= NFSEXP_READONLY;
417
418 /* There are two requirements on a filesystem to be exportable.
419 * 1: We must be able to identify the filesystem from a number.
420 * either a device number (so FS_REQUIRES_DEV needed)
421 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
422 * 2: We must be able to find an inode from a filehandle.
423 * This means that s_export_op must be set.
424 * 3: We must not currently be on an idmapped mount.
425 */
426 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
427 !(*flags & NFSEXP_FSID) &&
428 uuid == NULL) {
429 dprintk("exp_export: export of non-dev fs without fsid\n");
430 return -EINVAL;
431 }
432
433 if (!exportfs_can_decode_fh(inode->i_sb->s_export_op)) {
434 dprintk("exp_export: export of invalid fs type.\n");
435 return -EINVAL;
436 }
437
438 if (is_idmapped_mnt(path->mnt)) {
439 dprintk("exp_export: export of idmapped mounts not yet supported.\n");
440 return -EINVAL;
441 }
442
443 if (inode->i_sb->s_export_op->flags & EXPORT_OP_NOSUBTREECHK &&
444 !(*flags & NFSEXP_NOSUBTREECHECK)) {
445 dprintk("%s: %s does not support subtree checking!\n",
446 __func__, inode->i_sb->s_type->name);
447 return -EINVAL;
448 }
449 return 0;
450 }
451
452 #ifdef CONFIG_NFSD_V4
453
454 static int
455 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
456 {
457 int len;
458 int migrated, i, err;
459
460 /* more than one fsloc */
461 if (fsloc->locations)
462 return -EINVAL;
463
464 /* listsize */
465 err = get_uint(mesg, &fsloc->locations_count);
466 if (err)
467 return err;
468 if (fsloc->locations_count > MAX_FS_LOCATIONS)
469 return -EINVAL;
470 if (fsloc->locations_count == 0)
471 return 0;
472
473 fsloc->locations = kcalloc(fsloc->locations_count,
474 sizeof(struct nfsd4_fs_location),
475 GFP_KERNEL);
476 if (!fsloc->locations)
477 return -ENOMEM;
478 for (i=0; i < fsloc->locations_count; i++) {
479 /* colon separated host list */
480 err = -EINVAL;
481 len = qword_get(mesg, buf, PAGE_SIZE);
482 if (len <= 0)
483 goto out_free_all;
484 err = -ENOMEM;
485 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
486 if (!fsloc->locations[i].hosts)
487 goto out_free_all;
488 err = -EINVAL;
489 /* slash separated path component list */
490 len = qword_get(mesg, buf, PAGE_SIZE);
491 if (len <= 0)
492 goto out_free_all;
493 err = -ENOMEM;
494 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
495 if (!fsloc->locations[i].path)
496 goto out_free_all;
497 }
498 /* migrated */
499 err = get_int(mesg, &migrated);
500 if (err)
501 goto out_free_all;
502 err = -EINVAL;
503 if (migrated < 0 || migrated > 1)
504 goto out_free_all;
505 fsloc->migrated = migrated;
506 return 0;
507 out_free_all:
508 nfsd4_fslocs_free(fsloc);
509 return err;
510 }
511
512 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
513 {
514 struct exp_flavor_info *f;
515 u32 listsize;
516 int err;
517
518 /* more than one secinfo */
519 if (exp->ex_nflavors)
520 return -EINVAL;
521
522 err = get_uint(mesg, &listsize);
523 if (err)
524 return err;
525 if (listsize > MAX_SECINFO_LIST)
526 return -EINVAL;
527
528 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
529 err = get_uint(mesg, &f->pseudoflavor);
530 if (err)
531 return err;
532 /*
533 * XXX: It would be nice to also check whether this
534 * pseudoflavor is supported, so we can discover the
535 * problem at export time instead of when a client fails
536 * to authenticate.
537 */
538 err = get_uint(mesg, &f->flags);
539 if (err)
540 return err;
541 /* Only some flags are allowed to differ between flavors: */
542 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
543 return -EINVAL;
544 }
545 exp->ex_nflavors = listsize;
546 return 0;
547 }
548
549 #else /* CONFIG_NFSD_V4 */
550 static inline int
551 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
552 static inline int
553 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
554 #endif
555
556 static int xprtsec_parse(char **mesg, char *buf, struct svc_export *exp)
557 {
558 unsigned int i, mode, listsize;
559 int err;
560
561 err = get_uint(mesg, &listsize);
562 if (err)
563 return err;
564 if (listsize > NFSEXP_XPRTSEC_NUM)
565 return -EINVAL;
566
567 exp->ex_xprtsec_modes = 0;
568 for (i = 0; i < listsize; i++) {
569 err = get_uint(mesg, &mode);
570 if (err)
571 return err;
572 if (mode > NFSEXP_XPRTSEC_MTLS)
573 return -EINVAL;
574 exp->ex_xprtsec_modes |= mode;
575 }
576 return 0;
577 }
578
579 static inline int
580 nfsd_uuid_parse(char **mesg, char *buf, unsigned char **puuid)
581 {
582 int len;
583
584 /* more than one uuid */
585 if (*puuid)
586 return -EINVAL;
587
588 /* expect a 16 byte uuid encoded as \xXXXX... */
589 len = qword_get(mesg, buf, PAGE_SIZE);
590 if (len != EX_UUID_LEN)
591 return -EINVAL;
592
593 *puuid = kmemdup(buf, EX_UUID_LEN, GFP_KERNEL);
594 if (*puuid == NULL)
595 return -ENOMEM;
596
597 return 0;
598 }
599
600 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
601 {
602 /* client path expiry [flags anonuid anongid fsid] */
603 char *buf;
604 int err;
605 struct auth_domain *dom = NULL;
606 struct svc_export exp = {}, *expp;
607 int an_int;
608
609 if (mesg[mlen-1] != '\n')
610 return -EINVAL;
611 mesg[mlen-1] = 0;
612
613 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
614 if (!buf)
615 return -ENOMEM;
616
617 /* client */
618 err = -EINVAL;
619 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
620 goto out;
621
622 err = -ENOENT;
623 dom = auth_domain_find(buf);
624 if (!dom)
625 goto out;
626
627 /* path */
628 err = -EINVAL;
629 if (qword_get(&mesg, buf, PAGE_SIZE) <= 0)
630 goto out1;
631
632 err = kern_path(buf, 0, &exp.ex_path);
633 if (err)
634 goto out1;
635
636 exp.ex_client = dom;
637 exp.cd = cd;
638 exp.ex_devid_map = NULL;
639 exp.ex_xprtsec_modes = NFSEXP_XPRTSEC_ALL;
640
641 /* expiry */
642 err = get_expiry(&mesg, &exp.h.expiry_time);
643 if (err)
644 goto out3;
645
646 /* flags */
647 err = get_int(&mesg, &an_int);
648 if (err == -ENOENT) {
649 err = 0;
650 set_bit(CACHE_NEGATIVE, &exp.h.flags);
651 } else {
652 if (err || an_int < 0)
653 goto out3;
654 exp.ex_flags= an_int;
655
656 /* anon uid */
657 err = get_int(&mesg, &an_int);
658 if (err)
659 goto out3;
660 exp.ex_anon_uid= make_kuid(current_user_ns(), an_int);
661
662 /* anon gid */
663 err = get_int(&mesg, &an_int);
664 if (err)
665 goto out3;
666 exp.ex_anon_gid= make_kgid(current_user_ns(), an_int);
667
668 /* fsid */
669 err = get_int(&mesg, &an_int);
670 if (err)
671 goto out3;
672 exp.ex_fsid = an_int;
673
674 while (qword_get(&mesg, buf, PAGE_SIZE) > 0) {
675 if (strcmp(buf, "fsloc") == 0)
676 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
677 else if (strcmp(buf, "uuid") == 0)
678 err = nfsd_uuid_parse(&mesg, buf, &exp.ex_uuid);
679 else if (strcmp(buf, "secinfo") == 0)
680 err = secinfo_parse(&mesg, buf, &exp);
681 else if (strcmp(buf, "xprtsec") == 0)
682 err = xprtsec_parse(&mesg, buf, &exp);
683 else
684 /* quietly ignore unknown words and anything
685 * following. Newer user-space can try to set
686 * new values, then see what the result was.
687 */
688 break;
689 if (err)
690 goto out4;
691 }
692
693 err = check_export(&exp.ex_path, &exp.ex_flags, exp.ex_uuid);
694 if (err)
695 goto out4;
696
697 /*
698 * No point caching this if it would immediately expire.
699 * Also, this protects exportfs's dummy export from the
700 * anon_uid/anon_gid checks:
701 */
702 if (exp.h.expiry_time < seconds_since_boot())
703 goto out4;
704 /*
705 * For some reason exportfs has been passing down an
706 * invalid (-1) uid & gid on the "dummy" export which it
707 * uses to test export support. To make sure exportfs
708 * sees errors from check_export we therefore need to
709 * delay these checks till after check_export:
710 */
711 err = -EINVAL;
712 if (!uid_valid(exp.ex_anon_uid))
713 goto out4;
714 if (!gid_valid(exp.ex_anon_gid))
715 goto out4;
716 err = 0;
717
718 nfsd4_setup_layout_type(&exp);
719 }
720
721 expp = svc_export_lookup(&exp);
722 if (!expp) {
723 err = -ENOMEM;
724 goto out4;
725 }
726 expp = svc_export_update(&exp, expp);
727 if (expp) {
728 trace_nfsd_export_update(expp);
729 cache_flush();
730 exp_put(expp);
731 } else
732 err = -ENOMEM;
733 out4:
734 nfsd4_fslocs_free(&exp.ex_fslocs);
735 kfree(exp.ex_uuid);
736 out3:
737 path_put(&exp.ex_path);
738 out1:
739 auth_domain_put(dom);
740 out:
741 kfree(buf);
742 return err;
743 }
744
745 static void exp_flags(struct seq_file *m, int flag, int fsid,
746 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fslocs);
747 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
748
749 static int is_export_stats_file(struct seq_file *m)
750 {
751 /*
752 * The export_stats file uses the same ops as the exports file.
753 * We use the file's name to determine the reported info per export.
754 * There is no rename in nsfdfs, so d_name.name is stable.
755 */
756 return !strcmp(m->file->f_path.dentry->d_name.name, "export_stats");
757 }
758
759 static int svc_export_show(struct seq_file *m,
760 struct cache_detail *cd,
761 struct cache_head *h)
762 {
763 struct svc_export *exp;
764 bool export_stats = is_export_stats_file(m);
765
766 if (h == NULL) {
767 if (export_stats)
768 seq_puts(m, "#path domain start-time\n#\tstats\n");
769 else
770 seq_puts(m, "#path domain(flags)\n");
771 return 0;
772 }
773 exp = container_of(h, struct svc_export, h);
774 seq_path(m, &exp->ex_path, " \t\n\\");
775 seq_putc(m, '\t');
776 seq_escape(m, exp->ex_client->name, " \t\n\\");
777 if (export_stats) {
778 struct percpu_counter *counter = exp->ex_stats->counter;
779
780 seq_printf(m, "\t%lld\n", exp->ex_stats->start_time);
781 seq_printf(m, "\tfh_stale: %lld\n",
782 percpu_counter_sum_positive(&counter[EXP_STATS_FH_STALE]));
783 seq_printf(m, "\tio_read: %lld\n",
784 percpu_counter_sum_positive(&counter[EXP_STATS_IO_READ]));
785 seq_printf(m, "\tio_write: %lld\n",
786 percpu_counter_sum_positive(&counter[EXP_STATS_IO_WRITE]));
787 seq_putc(m, '\n');
788 return 0;
789 }
790 seq_putc(m, '(');
791 if (test_bit(CACHE_VALID, &h->flags) &&
792 !test_bit(CACHE_NEGATIVE, &h->flags)) {
793 exp_flags(m, exp->ex_flags, exp->ex_fsid,
794 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
795 if (exp->ex_uuid) {
796 int i;
797 seq_puts(m, ",uuid=");
798 for (i = 0; i < EX_UUID_LEN; i++) {
799 if ((i&3) == 0 && i)
800 seq_putc(m, ':');
801 seq_printf(m, "%02x", exp->ex_uuid[i]);
802 }
803 }
804 show_secinfo(m, exp);
805 }
806 seq_puts(m, ")\n");
807 return 0;
808 }
809 static int svc_export_match(struct cache_head *a, struct cache_head *b)
810 {
811 struct svc_export *orig = container_of(a, struct svc_export, h);
812 struct svc_export *new = container_of(b, struct svc_export, h);
813 return orig->ex_client == new->ex_client &&
814 path_equal(&orig->ex_path, &new->ex_path);
815 }
816
817 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
818 {
819 struct svc_export *new = container_of(cnew, struct svc_export, h);
820 struct svc_export *item = container_of(citem, struct svc_export, h);
821
822 kref_get(&item->ex_client->ref);
823 new->ex_client = item->ex_client;
824 new->ex_path = item->ex_path;
825 path_get(&item->ex_path);
826 new->ex_fslocs.locations = NULL;
827 new->ex_fslocs.locations_count = 0;
828 new->ex_fslocs.migrated = 0;
829 new->ex_layout_types = 0;
830 new->ex_uuid = NULL;
831 new->cd = item->cd;
832 export_stats_reset(new->ex_stats);
833 }
834
835 static void export_update(struct cache_head *cnew, struct cache_head *citem)
836 {
837 struct svc_export *new = container_of(cnew, struct svc_export, h);
838 struct svc_export *item = container_of(citem, struct svc_export, h);
839 int i;
840
841 new->ex_flags = item->ex_flags;
842 new->ex_anon_uid = item->ex_anon_uid;
843 new->ex_anon_gid = item->ex_anon_gid;
844 new->ex_fsid = item->ex_fsid;
845 new->ex_devid_map = item->ex_devid_map;
846 item->ex_devid_map = NULL;
847 new->ex_uuid = item->ex_uuid;
848 item->ex_uuid = NULL;
849 new->ex_fslocs.locations = item->ex_fslocs.locations;
850 item->ex_fslocs.locations = NULL;
851 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
852 item->ex_fslocs.locations_count = 0;
853 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
854 item->ex_fslocs.migrated = 0;
855 new->ex_layout_types = item->ex_layout_types;
856 new->ex_nflavors = item->ex_nflavors;
857 for (i = 0; i < MAX_SECINFO_LIST; i++) {
858 new->ex_flavors[i] = item->ex_flavors[i];
859 }
860 new->ex_xprtsec_modes = item->ex_xprtsec_modes;
861 }
862
863 static struct cache_head *svc_export_alloc(void)
864 {
865 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
866 if (!i)
867 return NULL;
868
869 i->ex_stats = kmalloc(sizeof(*(i->ex_stats)), GFP_KERNEL);
870 if (!i->ex_stats) {
871 kfree(i);
872 return NULL;
873 }
874
875 if (export_stats_init(i->ex_stats)) {
876 kfree(i->ex_stats);
877 kfree(i);
878 return NULL;
879 }
880
881 return &i->h;
882 }
883
884 static const struct cache_detail svc_export_cache_template = {
885 .owner = THIS_MODULE,
886 .hash_size = EXPORT_HASHMAX,
887 .name = "nfsd.export",
888 .cache_put = svc_export_put,
889 .cache_upcall = svc_export_upcall,
890 .cache_request = svc_export_request,
891 .cache_parse = svc_export_parse,
892 .cache_show = svc_export_show,
893 .match = svc_export_match,
894 .init = svc_export_init,
895 .update = export_update,
896 .alloc = svc_export_alloc,
897 };
898
899 static int
900 svc_export_hash(struct svc_export *exp)
901 {
902 int hash;
903
904 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
905 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
906 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
907 return hash;
908 }
909
910 static struct svc_export *
911 svc_export_lookup(struct svc_export *exp)
912 {
913 struct cache_head *ch;
914 int hash = svc_export_hash(exp);
915
916 ch = sunrpc_cache_lookup_rcu(exp->cd, &exp->h, hash);
917 if (ch)
918 return container_of(ch, struct svc_export, h);
919 else
920 return NULL;
921 }
922
923 static struct svc_export *
924 svc_export_update(struct svc_export *new, struct svc_export *old)
925 {
926 struct cache_head *ch;
927 int hash = svc_export_hash(old);
928
929 ch = sunrpc_cache_update(old->cd, &new->h, &old->h, hash);
930 if (ch)
931 return container_of(ch, struct svc_export, h);
932 else
933 return NULL;
934 }
935
936
937 static struct svc_expkey *
938 exp_find_key(struct cache_detail *cd, struct auth_domain *clp, int fsid_type,
939 u32 *fsidv, struct cache_req *reqp)
940 {
941 struct svc_expkey key, *ek;
942 int err;
943
944 if (!clp)
945 return ERR_PTR(-ENOENT);
946
947 key.ek_client = clp;
948 key.ek_fsidtype = fsid_type;
949 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
950
951 ek = svc_expkey_lookup(cd, &key);
952 if (ek == NULL)
953 return ERR_PTR(-ENOMEM);
954 err = cache_check(cd, &ek->h, reqp);
955 if (err) {
956 trace_nfsd_exp_find_key(&key, err);
957 return ERR_PTR(err);
958 }
959 return ek;
960 }
961
962 static struct svc_export *
963 exp_get_by_name(struct cache_detail *cd, struct auth_domain *clp,
964 const struct path *path, struct cache_req *reqp)
965 {
966 struct svc_export *exp, key;
967 int err;
968
969 if (!clp)
970 return ERR_PTR(-ENOENT);
971
972 key.ex_client = clp;
973 key.ex_path = *path;
974 key.cd = cd;
975
976 exp = svc_export_lookup(&key);
977 if (exp == NULL)
978 return ERR_PTR(-ENOMEM);
979 err = cache_check(cd, &exp->h, reqp);
980 if (err) {
981 trace_nfsd_exp_get_by_name(&key, err);
982 return ERR_PTR(err);
983 }
984 return exp;
985 }
986
987 /*
988 * Find the export entry for a given dentry.
989 */
990 static struct svc_export *
991 exp_parent(struct cache_detail *cd, struct auth_domain *clp, struct path *path)
992 {
993 struct dentry *saved = dget(path->dentry);
994 struct svc_export *exp = exp_get_by_name(cd, clp, path, NULL);
995
996 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
997 struct dentry *parent = dget_parent(path->dentry);
998 dput(path->dentry);
999 path->dentry = parent;
1000 exp = exp_get_by_name(cd, clp, path, NULL);
1001 }
1002 dput(path->dentry);
1003 path->dentry = saved;
1004 return exp;
1005 }
1006
1007
1008
1009 /*
1010 * Obtain the root fh on behalf of a client.
1011 * This could be done in user space, but I feel that it adds some safety
1012 * since its harder to fool a kernel module than a user space program.
1013 */
1014 int
1015 exp_rootfh(struct net *net, struct auth_domain *clp, char *name,
1016 struct knfsd_fh *f, int maxsize)
1017 {
1018 struct svc_export *exp;
1019 struct path path;
1020 struct inode *inode;
1021 struct svc_fh fh;
1022 int err;
1023 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1024 struct cache_detail *cd = nn->svc_export_cache;
1025
1026 err = -EPERM;
1027 /* NB: we probably ought to check that it's NUL-terminated */
1028 if (kern_path(name, 0, &path)) {
1029 printk("nfsd: exp_rootfh path not found %s", name);
1030 return err;
1031 }
1032 inode = d_inode(path.dentry);
1033
1034 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1035 name, path.dentry, clp->name,
1036 inode->i_sb->s_id, inode->i_ino);
1037 exp = exp_parent(cd, clp, &path);
1038 if (IS_ERR(exp)) {
1039 err = PTR_ERR(exp);
1040 goto out;
1041 }
1042
1043 /*
1044 * fh must be initialized before calling fh_compose
1045 */
1046 fh_init(&fh, maxsize);
1047 if (fh_compose(&fh, exp, path.dentry, NULL))
1048 err = -EINVAL;
1049 else
1050 err = 0;
1051 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1052 fh_put(&fh);
1053 exp_put(exp);
1054 out:
1055 path_put(&path);
1056 return err;
1057 }
1058
1059 static struct svc_export *exp_find(struct cache_detail *cd,
1060 struct auth_domain *clp, int fsid_type,
1061 u32 *fsidv, struct cache_req *reqp)
1062 {
1063 struct svc_export *exp;
1064 struct nfsd_net *nn = net_generic(cd->net, nfsd_net_id);
1065 struct svc_expkey *ek = exp_find_key(nn->svc_expkey_cache, clp, fsid_type, fsidv, reqp);
1066 if (IS_ERR(ek))
1067 return ERR_CAST(ek);
1068
1069 exp = exp_get_by_name(cd, clp, &ek->ek_path, reqp);
1070 cache_put(&ek->h, nn->svc_expkey_cache);
1071
1072 if (IS_ERR(exp))
1073 return ERR_CAST(exp);
1074 return exp;
1075 }
1076
1077 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1078 {
1079 struct exp_flavor_info *f, *end = exp->ex_flavors + exp->ex_nflavors;
1080 struct svc_xprt *xprt = rqstp->rq_xprt;
1081
1082 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_NONE) {
1083 if (!test_bit(XPT_TLS_SESSION, &xprt->xpt_flags))
1084 goto ok;
1085 }
1086 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_TLS) {
1087 if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
1088 !test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
1089 goto ok;
1090 }
1091 if (exp->ex_xprtsec_modes & NFSEXP_XPRTSEC_MTLS) {
1092 if (test_bit(XPT_TLS_SESSION, &xprt->xpt_flags) &&
1093 test_bit(XPT_PEER_AUTH, &xprt->xpt_flags))
1094 goto ok;
1095 }
1096 goto denied;
1097
1098 ok:
1099 /* legacy gss-only clients are always OK: */
1100 if (exp->ex_client == rqstp->rq_gssclient)
1101 return 0;
1102 /* ip-address based client; check sec= export option: */
1103 for (f = exp->ex_flavors; f < end; f++) {
1104 if (f->pseudoflavor == rqstp->rq_cred.cr_flavor)
1105 return 0;
1106 }
1107 /* defaults in absence of sec= options: */
1108 if (exp->ex_nflavors == 0) {
1109 if (rqstp->rq_cred.cr_flavor == RPC_AUTH_NULL ||
1110 rqstp->rq_cred.cr_flavor == RPC_AUTH_UNIX)
1111 return 0;
1112 }
1113
1114 /* If the compound op contains a spo_must_allowed op,
1115 * it will be sent with integrity/protection which
1116 * will have to be expressly allowed on mounts that
1117 * don't support it
1118 */
1119
1120 if (nfsd4_spo_must_allow(rqstp))
1121 return 0;
1122
1123 denied:
1124 return rqstp->rq_vers < 4 ? nfserr_acces : nfserr_wrongsec;
1125 }
1126
1127 /*
1128 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1129 * auth_unix client) if it's available and has secinfo information;
1130 * otherwise, will try to use rq_gssclient.
1131 *
1132 * Called from functions that handle requests; functions that do work on
1133 * behalf of mountd are passed a single client name to use, and should
1134 * use exp_get_by_name() or exp_find().
1135 */
1136 struct svc_export *
1137 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1138 {
1139 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1140 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1141 struct cache_detail *cd = nn->svc_export_cache;
1142
1143 if (rqstp->rq_client == NULL)
1144 goto gss;
1145
1146 /* First try the auth_unix client: */
1147 exp = exp_get_by_name(cd, rqstp->rq_client, path, &rqstp->rq_chandle);
1148 if (PTR_ERR(exp) == -ENOENT)
1149 goto gss;
1150 if (IS_ERR(exp))
1151 return exp;
1152 /* If it has secinfo, assume there are no gss/... clients */
1153 if (exp->ex_nflavors > 0)
1154 return exp;
1155 gss:
1156 /* Otherwise, try falling back on gss client */
1157 if (rqstp->rq_gssclient == NULL)
1158 return exp;
1159 gssexp = exp_get_by_name(cd, rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1160 if (PTR_ERR(gssexp) == -ENOENT)
1161 return exp;
1162 if (!IS_ERR(exp))
1163 exp_put(exp);
1164 return gssexp;
1165 }
1166
1167 struct svc_export *
1168 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1169 {
1170 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1171 struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
1172 struct cache_detail *cd = nn->svc_export_cache;
1173
1174 if (rqstp->rq_client == NULL)
1175 goto gss;
1176
1177 /* First try the auth_unix client: */
1178 exp = exp_find(cd, rqstp->rq_client, fsid_type,
1179 fsidv, &rqstp->rq_chandle);
1180 if (PTR_ERR(exp) == -ENOENT)
1181 goto gss;
1182 if (IS_ERR(exp))
1183 return exp;
1184 /* If it has secinfo, assume there are no gss/... clients */
1185 if (exp->ex_nflavors > 0)
1186 return exp;
1187 gss:
1188 /* Otherwise, try falling back on gss client */
1189 if (rqstp->rq_gssclient == NULL)
1190 return exp;
1191 gssexp = exp_find(cd, rqstp->rq_gssclient, fsid_type, fsidv,
1192 &rqstp->rq_chandle);
1193 if (PTR_ERR(gssexp) == -ENOENT)
1194 return exp;
1195 if (!IS_ERR(exp))
1196 exp_put(exp);
1197 return gssexp;
1198 }
1199
1200 struct svc_export *
1201 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1202 {
1203 struct dentry *saved = dget(path->dentry);
1204 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1205
1206 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1207 struct dentry *parent = dget_parent(path->dentry);
1208 dput(path->dentry);
1209 path->dentry = parent;
1210 exp = rqst_exp_get_by_name(rqstp, path);
1211 }
1212 dput(path->dentry);
1213 path->dentry = saved;
1214 return exp;
1215 }
1216
1217 struct svc_export *rqst_find_fsidzero_export(struct svc_rqst *rqstp)
1218 {
1219 u32 fsidv[2];
1220
1221 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1222
1223 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1224 }
1225
1226 /*
1227 * Called when we need the filehandle for the root of the pseudofs,
1228 * for a given NFSv4 client. The root is defined to be the
1229 * export point with fsid==0
1230 */
1231 __be32
1232 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1233 {
1234 struct svc_export *exp;
1235 __be32 rv;
1236
1237 exp = rqst_find_fsidzero_export(rqstp);
1238 if (IS_ERR(exp))
1239 return nfserrno(PTR_ERR(exp));
1240 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1241 exp_put(exp);
1242 return rv;
1243 }
1244
1245 static struct flags {
1246 int flag;
1247 char *name[2];
1248 } expflags[] = {
1249 { NFSEXP_READONLY, {"ro", "rw"}},
1250 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1251 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1252 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1253 { NFSEXP_ASYNC, {"async", "sync"}},
1254 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1255 { NFSEXP_NOREADDIRPLUS, {"nordirplus", ""}},
1256 { NFSEXP_NOHIDE, {"nohide", ""}},
1257 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1258 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1259 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1260 { NFSEXP_V4ROOT, {"v4root", ""}},
1261 { NFSEXP_PNFS, {"pnfs", ""}},
1262 { NFSEXP_SECURITY_LABEL, {"security_label", ""}},
1263 { 0, {"", ""}}
1264 };
1265
1266 static void show_expflags(struct seq_file *m, int flags, int mask)
1267 {
1268 struct flags *flg;
1269 int state, first = 0;
1270
1271 for (flg = expflags; flg->flag; flg++) {
1272 if (flg->flag & ~mask)
1273 continue;
1274 state = (flg->flag & flags) ? 0 : 1;
1275 if (*flg->name[state])
1276 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1277 }
1278 }
1279
1280 static void show_secinfo_flags(struct seq_file *m, int flags)
1281 {
1282 seq_printf(m, ",");
1283 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1284 }
1285
1286 static bool secinfo_flags_equal(int f, int g)
1287 {
1288 f &= NFSEXP_SECINFO_FLAGS;
1289 g &= NFSEXP_SECINFO_FLAGS;
1290 return f == g;
1291 }
1292
1293 static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1294 {
1295 int flags;
1296
1297 flags = (*fp)->flags;
1298 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1299 (*fp)++;
1300 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1301 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1302 (*fp)++;
1303 }
1304 return flags;
1305 }
1306
1307 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1308 {
1309 struct exp_flavor_info *f;
1310 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1311 int flags;
1312
1313 if (exp->ex_nflavors == 0)
1314 return;
1315 f = exp->ex_flavors;
1316 flags = show_secinfo_run(m, &f, end);
1317 if (!secinfo_flags_equal(flags, exp->ex_flags))
1318 show_secinfo_flags(m, flags);
1319 while (f != end) {
1320 flags = show_secinfo_run(m, &f, end);
1321 show_secinfo_flags(m, flags);
1322 }
1323 }
1324
1325 static void exp_flags(struct seq_file *m, int flag, int fsid,
1326 kuid_t anonu, kgid_t anong, struct nfsd4_fs_locations *fsloc)
1327 {
1328 struct user_namespace *userns = m->file->f_cred->user_ns;
1329
1330 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1331 if (flag & NFSEXP_FSID)
1332 seq_printf(m, ",fsid=%d", fsid);
1333 if (!uid_eq(anonu, make_kuid(userns, (uid_t)-2)) &&
1334 !uid_eq(anonu, make_kuid(userns, 0x10000-2)))
1335 seq_printf(m, ",anonuid=%u", from_kuid_munged(userns, anonu));
1336 if (!gid_eq(anong, make_kgid(userns, (gid_t)-2)) &&
1337 !gid_eq(anong, make_kgid(userns, 0x10000-2)))
1338 seq_printf(m, ",anongid=%u", from_kgid_munged(userns, anong));
1339 if (fsloc && fsloc->locations_count > 0) {
1340 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1341 int i;
1342
1343 seq_printf(m, ",%s=", loctype);
1344 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1345 seq_putc(m, '@');
1346 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1347 for (i = 1; i < fsloc->locations_count; i++) {
1348 seq_putc(m, ';');
1349 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1350 seq_putc(m, '@');
1351 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1352 }
1353 }
1354 }
1355
1356 static int e_show(struct seq_file *m, void *p)
1357 {
1358 struct cache_head *cp = p;
1359 struct svc_export *exp = container_of(cp, struct svc_export, h);
1360 struct cache_detail *cd = m->private;
1361 bool export_stats = is_export_stats_file(m);
1362
1363 if (p == SEQ_START_TOKEN) {
1364 seq_puts(m, "# Version 1.1\n");
1365 if (export_stats)
1366 seq_puts(m, "# Path Client Start-time\n#\tStats\n");
1367 else
1368 seq_puts(m, "# Path Client(Flags) # IPs\n");
1369 return 0;
1370 }
1371
1372 exp_get(exp);
1373 if (cache_check(cd, &exp->h, NULL))
1374 return 0;
1375 exp_put(exp);
1376 return svc_export_show(m, cd, cp);
1377 }
1378
1379 const struct seq_operations nfs_exports_op = {
1380 .start = cache_seq_start_rcu,
1381 .next = cache_seq_next_rcu,
1382 .stop = cache_seq_stop_rcu,
1383 .show = e_show,
1384 };
1385
1386 /*
1387 * Initialize the exports module.
1388 */
1389 int
1390 nfsd_export_init(struct net *net)
1391 {
1392 int rv;
1393 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1394
1395 dprintk("nfsd: initializing export module (net: %x).\n", net->ns.inum);
1396
1397 nn->svc_export_cache = cache_create_net(&svc_export_cache_template, net);
1398 if (IS_ERR(nn->svc_export_cache))
1399 return PTR_ERR(nn->svc_export_cache);
1400 rv = cache_register_net(nn->svc_export_cache, net);
1401 if (rv)
1402 goto destroy_export_cache;
1403
1404 nn->svc_expkey_cache = cache_create_net(&svc_expkey_cache_template, net);
1405 if (IS_ERR(nn->svc_expkey_cache)) {
1406 rv = PTR_ERR(nn->svc_expkey_cache);
1407 goto unregister_export_cache;
1408 }
1409 rv = cache_register_net(nn->svc_expkey_cache, net);
1410 if (rv)
1411 goto destroy_expkey_cache;
1412 return 0;
1413
1414 destroy_expkey_cache:
1415 cache_destroy_net(nn->svc_expkey_cache, net);
1416 unregister_export_cache:
1417 cache_unregister_net(nn->svc_export_cache, net);
1418 destroy_export_cache:
1419 cache_destroy_net(nn->svc_export_cache, net);
1420 return rv;
1421 }
1422
1423 /*
1424 * Flush exports table - called when last nfsd thread is killed
1425 */
1426 void
1427 nfsd_export_flush(struct net *net)
1428 {
1429 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1430
1431 cache_purge(nn->svc_expkey_cache);
1432 cache_purge(nn->svc_export_cache);
1433 }
1434
1435 /*
1436 * Shutdown the exports module.
1437 */
1438 void
1439 nfsd_export_shutdown(struct net *net)
1440 {
1441 struct nfsd_net *nn = net_generic(net, nfsd_net_id);
1442
1443 dprintk("nfsd: shutting down export module (net: %x).\n", net->ns.inum);
1444
1445 cache_unregister_net(nn->svc_expkey_cache, net);
1446 cache_unregister_net(nn->svc_export_cache, net);
1447 cache_destroy_net(nn->svc_expkey_cache, net);
1448 cache_destroy_net(nn->svc_export_cache, net);
1449 svcauth_unix_purge(net);
1450
1451 dprintk("nfsd: export shutdown complete (net: %x).\n", net->ns.inum);
1452 }
1453
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.