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Introduce path_put()
[linux-2.6/x86.git] / fs / nfsd / export.c
blob717413f07e9a3f20d7b242e6e2090d98941fd875
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/stat.h>
20 #include <linux/in.h>
21 #include <linux/seq_file.h>
22 #include <linux/syscalls.h>
23 #include <linux/rwsem.h>
24 #include <linux/dcache.h>
25 #include <linux/namei.h>
26 #include <linux/mount.h>
27 #include <linux/hash.h>
28 #include <linux/module.h>
29 #include <linux/exportfs.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 #include <linux/sunrpc/msg_prot.h>
37 #include <linux/sunrpc/gss_api.h>
38
39 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
40
41 typedef struct auth_domain svc_client;
42 typedef struct svc_export svc_export;
43
44 static void exp_do_unexport(svc_export *unexp);
45 static int exp_verify_string(char *cp, int max);
46
47 /*
48 * We have two caches.
49 * One maps client+vfsmnt+dentry to export options - the export map
50 * The other maps client+filehandle-fragment to export options. - the expkey map
51 *
52 * The export options are actually stored in the first map, and the
53 * second map contains a reference to the entry in the first map.
54 */
55
56 #define EXPKEY_HASHBITS 8
57 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
58 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
59 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
60
61 static void expkey_put(struct kref *ref)
62 {
63 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
64
65 if (test_bit(CACHE_VALID, &key->h.flags) &&
66 !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
67 dput(key->ek_dentry);
68 mntput(key->ek_mnt);
69 }
70 auth_domain_put(key->ek_client);
71 kfree(key);
72 }
73
74 static void expkey_request(struct cache_detail *cd,
75 struct cache_head *h,
76 char **bpp, int *blen)
77 {
78 /* client fsidtype \xfsid */
79 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
80 char type[5];
81
82 qword_add(bpp, blen, ek->ek_client->name);
83 snprintf(type, 5, "%d", ek->ek_fsidtype);
84 qword_add(bpp, blen, type);
85 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
86 (*bpp)[-1] = '\n';
87 }
88
89 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
90 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
91 static struct cache_detail svc_expkey_cache;
92
93 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
94 {
95 /* client fsidtype fsid [path] */
96 char *buf;
97 int len;
98 struct auth_domain *dom = NULL;
99 int err;
100 int fsidtype;
101 char *ep;
102 struct svc_expkey key;
103 struct svc_expkey *ek;
104
105 if (mesg[mlen-1] != '\n')
106 return -EINVAL;
107 mesg[mlen-1] = 0;
108
109 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
110 err = -ENOMEM;
111 if (!buf) goto out;
112
113 err = -EINVAL;
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
115 goto out;
116
117 err = -ENOENT;
118 dom = auth_domain_find(buf);
119 if (!dom)
120 goto out;
121 dprintk("found domain %s\n", buf);
122
123 err = -EINVAL;
124 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
125 goto out;
126 fsidtype = simple_strtoul(buf, &ep, 10);
127 if (*ep)
128 goto out;
129 dprintk("found fsidtype %d\n", fsidtype);
130 if (key_len(fsidtype)==0) /* invalid type */
131 goto out;
132 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
133 goto out;
134 dprintk("found fsid length %d\n", len);
135 if (len != key_len(fsidtype))
136 goto out;
137
138 /* OK, we seem to have a valid key */
139 key.h.flags = 0;
140 key.h.expiry_time = get_expiry(&mesg);
141 if (key.h.expiry_time == 0)
142 goto out;
143
144 key.ek_client = dom;
145 key.ek_fsidtype = fsidtype;
146 memcpy(key.ek_fsid, buf, len);
147
148 ek = svc_expkey_lookup(&key);
149 err = -ENOMEM;
150 if (!ek)
151 goto out;
152
153 /* now we want a pathname, or empty meaning NEGATIVE */
154 err = -EINVAL;
155 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
156 goto out;
157 dprintk("Path seems to be <%s>\n", buf);
158 err = 0;
159 if (len == 0) {
160 set_bit(CACHE_NEGATIVE, &key.h.flags);
161 ek = svc_expkey_update(&key, ek);
162 if (ek)
163 cache_put(&ek->h, &svc_expkey_cache);
164 else err = -ENOMEM;
165 } else {
166 struct nameidata nd;
167 err = path_lookup(buf, 0, &nd);
168 if (err)
169 goto out;
170
171 dprintk("Found the path %s\n", buf);
172 key.ek_mnt = nd.path.mnt;
173 key.ek_dentry = nd.path.dentry;
174
175 ek = svc_expkey_update(&key, ek);
176 if (ek)
177 cache_put(&ek->h, &svc_expkey_cache);
178 else
179 err = -ENOMEM;
180 path_put(&nd.path);
181 }
182 cache_flush();
183 out:
184 if (dom)
185 auth_domain_put(dom);
186 kfree(buf);
187 return err;
188 }
189
190 static int expkey_show(struct seq_file *m,
191 struct cache_detail *cd,
192 struct cache_head *h)
193 {
194 struct svc_expkey *ek ;
195 int i;
196
197 if (h ==NULL) {
198 seq_puts(m, "#domain fsidtype fsid [path]\n");
199 return 0;
200 }
201 ek = container_of(h, struct svc_expkey, h);
202 seq_printf(m, "%s %d 0x", ek->ek_client->name,
203 ek->ek_fsidtype);
204 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
205 seq_printf(m, "%08x", ek->ek_fsid[i]);
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
237 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
238 }
239
240 static inline void expkey_update(struct cache_head *cnew,
241 struct cache_head *citem)
242 {
243 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
244 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
245
246 new->ek_mnt = mntget(item->ek_mnt);
247 new->ek_dentry = dget(item->ek_dentry);
248 }
249
250 static struct cache_head *expkey_alloc(void)
251 {
252 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
253 if (i)
254 return &i->h;
255 else
256 return NULL;
257 }
258
259 static struct cache_detail svc_expkey_cache = {
260 .owner = THIS_MODULE,
261 .hash_size = EXPKEY_HASHMAX,
262 .hash_table = expkey_table,
263 .name = "nfsd.fh",
264 .cache_put = expkey_put,
265 .cache_request = expkey_request,
266 .cache_parse = expkey_parse,
267 .cache_show = expkey_show,
268 .match = expkey_match,
269 .init = expkey_init,
270 .update = expkey_update,
271 .alloc = expkey_alloc,
272 };
273
274 static struct svc_expkey *
275 svc_expkey_lookup(struct svc_expkey *item)
276 {
277 struct cache_head *ch;
278 int hash = item->ek_fsidtype;
279 char * cp = (char*)item->ek_fsid;
280 int len = key_len(item->ek_fsidtype);
281
282 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
283 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
284 hash &= EXPKEY_HASHMASK;
285
286 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
287 hash);
288 if (ch)
289 return container_of(ch, struct svc_expkey, h);
290 else
291 return NULL;
292 }
293
294 static struct svc_expkey *
295 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
296 {
297 struct cache_head *ch;
298 int hash = new->ek_fsidtype;
299 char * cp = (char*)new->ek_fsid;
300 int len = key_len(new->ek_fsidtype);
301
302 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
303 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
304 hash &= EXPKEY_HASHMASK;
305
306 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
307 &old->h, hash);
308 if (ch)
309 return container_of(ch, struct svc_expkey, h);
310 else
311 return NULL;
312 }
313
314
315 #define EXPORT_HASHBITS 8
316 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
317 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
318
319 static struct cache_head *export_table[EXPORT_HASHMAX];
320
321 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
322 {
323 int i;
324
325 for (i = 0; i < fsloc->locations_count; i++) {
326 kfree(fsloc->locations[i].path);
327 kfree(fsloc->locations[i].hosts);
328 }
329 kfree(fsloc->locations);
330 }
331
332 static void svc_export_put(struct kref *ref)
333 {
334 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
335 dput(exp->ex_dentry);
336 mntput(exp->ex_mnt);
337 auth_domain_put(exp->ex_client);
338 kfree(exp->ex_path);
339 nfsd4_fslocs_free(&exp->ex_fslocs);
340 kfree(exp);
341 }
342
343 static void svc_export_request(struct cache_detail *cd,
344 struct cache_head *h,
345 char **bpp, int *blen)
346 {
347 /* client path */
348 struct svc_export *exp = container_of(h, struct svc_export, h);
349 char *pth;
350
351 qword_add(bpp, blen, exp->ex_client->name);
352 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
353 if (IS_ERR(pth)) {
354 /* is this correct? */
355 (*bpp)[0] = '\n';
356 return;
357 }
358 qword_add(bpp, blen, pth);
359 (*bpp)[-1] = '\n';
360 }
361
362 static struct svc_export *svc_export_update(struct svc_export *new,
363 struct svc_export *old);
364 static struct svc_export *svc_export_lookup(struct svc_export *);
365
366 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
367 {
368
369 /* We currently export only dirs and regular files.
370 * This is what umountd does.
371 */
372 if (!S_ISDIR(inode->i_mode) &&
373 !S_ISREG(inode->i_mode))
374 return -ENOTDIR;
375
376 /* There are two requirements on a filesystem to be exportable.
377 * 1: We must be able to identify the filesystem from a number.
378 * either a device number (so FS_REQUIRES_DEV needed)
379 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
380 * 2: We must be able to find an inode from a filehandle.
381 * This means that s_export_op must be set.
382 */
383 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
384 !(flags & NFSEXP_FSID) &&
385 uuid == NULL) {
386 dprintk("exp_export: export of non-dev fs without fsid\n");
387 return -EINVAL;
388 }
389
390 if (!inode->i_sb->s_export_op ||
391 !inode->i_sb->s_export_op->fh_to_dentry) {
392 dprintk("exp_export: export of invalid fs type.\n");
393 return -EINVAL;
394 }
395
396 return 0;
397
398 }
399
400 #ifdef CONFIG_NFSD_V4
401
402 static int
403 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
404 {
405 int len;
406 int migrated, i, err;
407
408 /* listsize */
409 err = get_int(mesg, &fsloc->locations_count);
410 if (err)
411 return err;
412 if (fsloc->locations_count > MAX_FS_LOCATIONS)
413 return -EINVAL;
414 if (fsloc->locations_count == 0)
415 return 0;
416
417 fsloc->locations = kzalloc(fsloc->locations_count
418 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
419 if (!fsloc->locations)
420 return -ENOMEM;
421 for (i=0; i < fsloc->locations_count; i++) {
422 /* colon separated host list */
423 err = -EINVAL;
424 len = qword_get(mesg, buf, PAGE_SIZE);
425 if (len <= 0)
426 goto out_free_all;
427 err = -ENOMEM;
428 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
429 if (!fsloc->locations[i].hosts)
430 goto out_free_all;
431 err = -EINVAL;
432 /* slash separated path component list */
433 len = qword_get(mesg, buf, PAGE_SIZE);
434 if (len <= 0)
435 goto out_free_all;
436 err = -ENOMEM;
437 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
438 if (!fsloc->locations[i].path)
439 goto out_free_all;
440 }
441 /* migrated */
442 err = get_int(mesg, &migrated);
443 if (err)
444 goto out_free_all;
445 err = -EINVAL;
446 if (migrated < 0 || migrated > 1)
447 goto out_free_all;
448 fsloc->migrated = migrated;
449 return 0;
450 out_free_all:
451 nfsd4_fslocs_free(fsloc);
452 return err;
453 }
454
455 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
456 {
457 int listsize, err;
458 struct exp_flavor_info *f;
459
460 err = get_int(mesg, &listsize);
461 if (err)
462 return err;
463 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
464 return -EINVAL;
465
466 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
467 err = get_int(mesg, &f->pseudoflavor);
468 if (err)
469 return err;
470 /*
471 * Just a quick sanity check; we could also try to check
472 * whether this pseudoflavor is supported, but at worst
473 * an unsupported pseudoflavor on the export would just
474 * be a pseudoflavor that won't match the flavor of any
475 * authenticated request. The administrator will
476 * probably discover the problem when someone fails to
477 * authenticate.
478 */
479 if (f->pseudoflavor < 0)
480 return -EINVAL;
481 err = get_int(mesg, &f->flags);
482 if (err)
483 return err;
484 /* Only some flags are allowed to differ between flavors: */
485 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
486 return -EINVAL;
487 }
488 exp->ex_nflavors = listsize;
489 return 0;
490 }
491
492 #else /* CONFIG_NFSD_V4 */
493 static inline int
494 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
495 static inline int
496 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
497 #endif
498
499 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
500 {
501 /* client path expiry [flags anonuid anongid fsid] */
502 char *buf;
503 int len;
504 int err;
505 struct auth_domain *dom = NULL;
506 struct nameidata nd;
507 struct svc_export exp, *expp;
508 int an_int;
509
510 nd.path.dentry = NULL;
511 exp.ex_path = NULL;
512
513 /* fs locations */
514 exp.ex_fslocs.locations = NULL;
515 exp.ex_fslocs.locations_count = 0;
516 exp.ex_fslocs.migrated = 0;
517
518 exp.ex_uuid = NULL;
519
520 /* secinfo */
521 exp.ex_nflavors = 0;
522
523 if (mesg[mlen-1] != '\n')
524 return -EINVAL;
525 mesg[mlen-1] = 0;
526
527 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
528 err = -ENOMEM;
529 if (!buf) goto out;
530
531 /* client */
532 len = qword_get(&mesg, buf, PAGE_SIZE);
533 err = -EINVAL;
534 if (len <= 0) goto out;
535
536 err = -ENOENT;
537 dom = auth_domain_find(buf);
538 if (!dom)
539 goto out;
540
541 /* path */
542 err = -EINVAL;
543 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
544 goto out;
545 err = path_lookup(buf, 0, &nd);
546 if (err) goto out_no_path;
547
548 exp.h.flags = 0;
549 exp.ex_client = dom;
550 exp.ex_mnt = nd.path.mnt;
551 exp.ex_dentry = nd.path.dentry;
552 exp.ex_path = kstrdup(buf, GFP_KERNEL);
553 err = -ENOMEM;
554 if (!exp.ex_path)
555 goto out;
556
557 /* expiry */
558 err = -EINVAL;
559 exp.h.expiry_time = get_expiry(&mesg);
560 if (exp.h.expiry_time == 0)
561 goto out;
562
563 /* flags */
564 err = get_int(&mesg, &an_int);
565 if (err == -ENOENT) {
566 err = 0;
567 set_bit(CACHE_NEGATIVE, &exp.h.flags);
568 } else {
569 if (err || an_int < 0) goto out;
570 exp.ex_flags= an_int;
571
572 /* anon uid */
573 err = get_int(&mesg, &an_int);
574 if (err) goto out;
575 exp.ex_anon_uid= an_int;
576
577 /* anon gid */
578 err = get_int(&mesg, &an_int);
579 if (err) goto out;
580 exp.ex_anon_gid= an_int;
581
582 /* fsid */
583 err = get_int(&mesg, &an_int);
584 if (err) goto out;
585 exp.ex_fsid = an_int;
586
587 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
588 if (strcmp(buf, "fsloc") == 0)
589 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
590 else if (strcmp(buf, "uuid") == 0) {
591 /* expect a 16 byte uuid encoded as \xXXXX... */
592 len = qword_get(&mesg, buf, PAGE_SIZE);
593 if (len != 16)
594 err = -EINVAL;
595 else {
596 exp.ex_uuid =
597 kmemdup(buf, 16, GFP_KERNEL);
598 if (exp.ex_uuid == NULL)
599 err = -ENOMEM;
600 }
601 } else if (strcmp(buf, "secinfo") == 0)
602 err = secinfo_parse(&mesg, buf, &exp);
603 else
604 /* quietly ignore unknown words and anything
605 * following. Newer user-space can try to set
606 * new values, then see what the result was.
607 */
608 break;
609 if (err)
610 goto out;
611 }
612
613 err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
614 exp.ex_uuid);
615 if (err) goto out;
616 }
617
618 expp = svc_export_lookup(&exp);
619 if (expp)
620 expp = svc_export_update(&exp, expp);
621 else
622 err = -ENOMEM;
623 cache_flush();
624 if (expp == NULL)
625 err = -ENOMEM;
626 else
627 exp_put(expp);
628 out:
629 nfsd4_fslocs_free(&exp.ex_fslocs);
630 kfree(exp.ex_uuid);
631 kfree(exp.ex_path);
632 if (nd.path.dentry)
633 path_put(&nd.path);
634 out_no_path:
635 if (dom)
636 auth_domain_put(dom);
637 kfree(buf);
638 return err;
639 }
640
641 static void exp_flags(struct seq_file *m, int flag, int fsid,
642 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
643 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
644
645 static int svc_export_show(struct seq_file *m,
646 struct cache_detail *cd,
647 struct cache_head *h)
648 {
649 struct svc_export *exp ;
650
651 if (h ==NULL) {
652 seq_puts(m, "#path domain(flags)\n");
653 return 0;
654 }
655 exp = container_of(h, struct svc_export, h);
656 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
657 seq_putc(m, '\t');
658 seq_escape(m, exp->ex_client->name, " \t\n\\");
659 seq_putc(m, '(');
660 if (test_bit(CACHE_VALID, &h->flags) &&
661 !test_bit(CACHE_NEGATIVE, &h->flags)) {
662 exp_flags(m, exp->ex_flags, exp->ex_fsid,
663 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
664 if (exp->ex_uuid) {
665 int i;
666 seq_puts(m, ",uuid=");
667 for (i=0; i<16; i++) {
668 if ((i&3) == 0 && i)
669 seq_putc(m, ':');
670 seq_printf(m, "%02x", exp->ex_uuid[i]);
671 }
672 }
673 show_secinfo(m, exp);
674 }
675 seq_puts(m, ")\n");
676 return 0;
677 }
678 static int svc_export_match(struct cache_head *a, struct cache_head *b)
679 {
680 struct svc_export *orig = container_of(a, struct svc_export, h);
681 struct svc_export *new = container_of(b, struct svc_export, h);
682 return orig->ex_client == new->ex_client &&
683 orig->ex_dentry == new->ex_dentry &&
684 orig->ex_mnt == new->ex_mnt;
685 }
686
687 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
688 {
689 struct svc_export *new = container_of(cnew, struct svc_export, h);
690 struct svc_export *item = container_of(citem, struct svc_export, h);
691
692 kref_get(&item->ex_client->ref);
693 new->ex_client = item->ex_client;
694 new->ex_dentry = dget(item->ex_dentry);
695 new->ex_mnt = mntget(item->ex_mnt);
696 new->ex_path = NULL;
697 new->ex_fslocs.locations = NULL;
698 new->ex_fslocs.locations_count = 0;
699 new->ex_fslocs.migrated = 0;
700 }
701
702 static void export_update(struct cache_head *cnew, struct cache_head *citem)
703 {
704 struct svc_export *new = container_of(cnew, struct svc_export, h);
705 struct svc_export *item = container_of(citem, struct svc_export, h);
706 int i;
707
708 new->ex_flags = item->ex_flags;
709 new->ex_anon_uid = item->ex_anon_uid;
710 new->ex_anon_gid = item->ex_anon_gid;
711 new->ex_fsid = item->ex_fsid;
712 new->ex_uuid = item->ex_uuid;
713 item->ex_uuid = NULL;
714 new->ex_path = item->ex_path;
715 item->ex_path = NULL;
716 new->ex_fslocs.locations = item->ex_fslocs.locations;
717 item->ex_fslocs.locations = NULL;
718 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
719 item->ex_fslocs.locations_count = 0;
720 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
721 item->ex_fslocs.migrated = 0;
722 new->ex_nflavors = item->ex_nflavors;
723 for (i = 0; i < MAX_SECINFO_LIST; i++) {
724 new->ex_flavors[i] = item->ex_flavors[i];
725 }
726 }
727
728 static struct cache_head *svc_export_alloc(void)
729 {
730 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
731 if (i)
732 return &i->h;
733 else
734 return NULL;
735 }
736
737 struct cache_detail svc_export_cache = {
738 .owner = THIS_MODULE,
739 .hash_size = EXPORT_HASHMAX,
740 .hash_table = export_table,
741 .name = "nfsd.export",
742 .cache_put = svc_export_put,
743 .cache_request = svc_export_request,
744 .cache_parse = svc_export_parse,
745 .cache_show = svc_export_show,
746 .match = svc_export_match,
747 .init = svc_export_init,
748 .update = export_update,
749 .alloc = svc_export_alloc,
750 };
751
752 static struct svc_export *
753 svc_export_lookup(struct svc_export *exp)
754 {
755 struct cache_head *ch;
756 int hash;
757 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
758 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
759 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
760
761 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
762 hash);
763 if (ch)
764 return container_of(ch, struct svc_export, h);
765 else
766 return NULL;
767 }
768
769 static struct svc_export *
770 svc_export_update(struct svc_export *new, struct svc_export *old)
771 {
772 struct cache_head *ch;
773 int hash;
774 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
775 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
776 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
777
778 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
779 &old->h,
780 hash);
781 if (ch)
782 return container_of(ch, struct svc_export, h);
783 else
784 return NULL;
785 }
786
787
788 static struct svc_expkey *
789 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
790 {
791 struct svc_expkey key, *ek;
792 int err;
793
794 if (!clp)
795 return ERR_PTR(-ENOENT);
796
797 key.ek_client = clp;
798 key.ek_fsidtype = fsid_type;
799 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
800
801 ek = svc_expkey_lookup(&key);
802 if (ek == NULL)
803 return ERR_PTR(-ENOMEM);
804 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
805 if (err)
806 return ERR_PTR(err);
807 return ek;
808 }
809
810 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
811 struct svc_export *exp)
812 {
813 struct svc_expkey key, *ek;
814
815 key.ek_client = clp;
816 key.ek_fsidtype = fsid_type;
817 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
818 key.ek_mnt = exp->ex_mnt;
819 key.ek_dentry = exp->ex_dentry;
820 key.h.expiry_time = NEVER;
821 key.h.flags = 0;
822
823 ek = svc_expkey_lookup(&key);
824 if (ek)
825 ek = svc_expkey_update(&key,ek);
826 if (ek) {
827 cache_put(&ek->h, &svc_expkey_cache);
828 return 0;
829 }
830 return -ENOMEM;
831 }
832
833 /*
834 * Find the client's export entry matching xdev/xino.
835 */
836 static inline struct svc_expkey *
837 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
838 {
839 u32 fsidv[3];
840
841 if (old_valid_dev(dev)) {
842 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
843 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
844 }
845 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
846 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
847 }
848
849 /*
850 * Find the client's export entry matching fsid
851 */
852 static inline struct svc_expkey *
853 exp_get_fsid_key(svc_client *clp, int fsid)
854 {
855 u32 fsidv[2];
856
857 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
858
859 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
860 }
861
862 static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
863 struct dentry *dentry,
864 struct cache_req *reqp)
865 {
866 struct svc_export *exp, key;
867 int err;
868
869 if (!clp)
870 return ERR_PTR(-ENOENT);
871
872 key.ex_client = clp;
873 key.ex_mnt = mnt;
874 key.ex_dentry = dentry;
875
876 exp = svc_export_lookup(&key);
877 if (exp == NULL)
878 return ERR_PTR(-ENOMEM);
879 err = cache_check(&svc_export_cache, &exp->h, reqp);
880 if (err)
881 return ERR_PTR(err);
882 return exp;
883 }
884
885 /*
886 * Find the export entry for a given dentry.
887 */
888 static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
889 struct dentry *dentry,
890 struct cache_req *reqp)
891 {
892 svc_export *exp;
893
894 dget(dentry);
895 exp = exp_get_by_name(clp, mnt, dentry, reqp);
896
897 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
898 struct dentry *parent;
899
900 parent = dget_parent(dentry);
901 dput(dentry);
902 dentry = parent;
903 exp = exp_get_by_name(clp, mnt, dentry, reqp);
904 }
905 dput(dentry);
906 return exp;
907 }
908
909 /*
910 * Hashtable locking. Write locks are placed only by user processes
911 * wanting to modify export information.
912 * Write locking only done in this file. Read locking
913 * needed externally.
914 */
915
916 static DECLARE_RWSEM(hash_sem);
917
918 void
919 exp_readlock(void)
920 {
921 down_read(&hash_sem);
922 }
923
924 static inline void
925 exp_writelock(void)
926 {
927 down_write(&hash_sem);
928 }
929
930 void
931 exp_readunlock(void)
932 {
933 up_read(&hash_sem);
934 }
935
936 static inline void
937 exp_writeunlock(void)
938 {
939 up_write(&hash_sem);
940 }
941
942 static void exp_fsid_unhash(struct svc_export *exp)
943 {
944 struct svc_expkey *ek;
945
946 if ((exp->ex_flags & NFSEXP_FSID) == 0)
947 return;
948
949 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
950 if (!IS_ERR(ek)) {
951 ek->h.expiry_time = get_seconds()-1;
952 cache_put(&ek->h, &svc_expkey_cache);
953 }
954 svc_expkey_cache.nextcheck = get_seconds();
955 }
956
957 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
958 {
959 u32 fsid[2];
960
961 if ((exp->ex_flags & NFSEXP_FSID) == 0)
962 return 0;
963
964 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
965 return exp_set_key(clp, FSID_NUM, fsid, exp);
966 }
967
968 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
969 {
970 u32 fsid[2];
971 struct inode *inode = exp->ex_dentry->d_inode;
972 dev_t dev = inode->i_sb->s_dev;
973
974 if (old_valid_dev(dev)) {
975 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
976 return exp_set_key(clp, FSID_DEV, fsid, exp);
977 }
978 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
979 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
980 }
981
982 static void exp_unhash(struct svc_export *exp)
983 {
984 struct svc_expkey *ek;
985 struct inode *inode = exp->ex_dentry->d_inode;
986
987 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
988 if (!IS_ERR(ek)) {
989 ek->h.expiry_time = get_seconds()-1;
990 cache_put(&ek->h, &svc_expkey_cache);
991 }
992 svc_expkey_cache.nextcheck = get_seconds();
993 }
994
995 /*
996 * Export a file system.
997 */
998 int
999 exp_export(struct nfsctl_export *nxp)
1000 {
1001 svc_client *clp;
1002 struct svc_export *exp = NULL;
1003 struct svc_export new;
1004 struct svc_expkey *fsid_key = NULL;
1005 struct nameidata nd;
1006 int err;
1007
1008 /* Consistency check */
1009 err = -EINVAL;
1010 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1011 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1012 goto out;
1013
1014 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1015 nxp->ex_client, nxp->ex_path,
1016 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1017 nxp->ex_flags);
1018
1019 /* Try to lock the export table for update */
1020 exp_writelock();
1021
1022 /* Look up client info */
1023 if (!(clp = auth_domain_find(nxp->ex_client)))
1024 goto out_unlock;
1025
1026
1027 /* Look up the dentry */
1028 err = path_lookup(nxp->ex_path, 0, &nd);
1029 if (err)
1030 goto out_unlock;
1031 err = -EINVAL;
1032
1033 exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
1034
1035 memset(&new, 0, sizeof(new));
1036
1037 /* must make sure there won't be an ex_fsid clash */
1038 if ((nxp->ex_flags & NFSEXP_FSID) &&
1039 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1040 fsid_key->ek_mnt &&
1041 (fsid_key->ek_mnt != nd.path.mnt ||
1042 fsid_key->ek_dentry != nd.path.dentry))
1043 goto finish;
1044
1045 if (!IS_ERR(exp)) {
1046 /* just a flags/id/fsid update */
1047
1048 exp_fsid_unhash(exp);
1049 exp->ex_flags = nxp->ex_flags;
1050 exp->ex_anon_uid = nxp->ex_anon_uid;
1051 exp->ex_anon_gid = nxp->ex_anon_gid;
1052 exp->ex_fsid = nxp->ex_dev;
1053
1054 err = exp_fsid_hash(clp, exp);
1055 goto finish;
1056 }
1057
1058 err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
1059 if (err) goto finish;
1060
1061 err = -ENOMEM;
1062
1063 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1064
1065 new.h.expiry_time = NEVER;
1066 new.h.flags = 0;
1067 new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL);
1068 if (!new.ex_path)
1069 goto finish;
1070 new.ex_client = clp;
1071 new.ex_mnt = nd.path.mnt;
1072 new.ex_dentry = nd.path.dentry;
1073 new.ex_flags = nxp->ex_flags;
1074 new.ex_anon_uid = nxp->ex_anon_uid;
1075 new.ex_anon_gid = nxp->ex_anon_gid;
1076 new.ex_fsid = nxp->ex_dev;
1077
1078 exp = svc_export_lookup(&new);
1079 if (exp)
1080 exp = svc_export_update(&new, exp);
1081
1082 if (!exp)
1083 goto finish;
1084
1085 if (exp_hash(clp, exp) ||
1086 exp_fsid_hash(clp, exp)) {
1087 /* failed to create at least one index */
1088 exp_do_unexport(exp);
1089 cache_flush();
1090 } else
1091 err = 0;
1092 finish:
1093 if (new.ex_path)
1094 kfree(new.ex_path);
1095 if (exp)
1096 exp_put(exp);
1097 if (fsid_key && !IS_ERR(fsid_key))
1098 cache_put(&fsid_key->h, &svc_expkey_cache);
1099 if (clp)
1100 auth_domain_put(clp);
1101 path_put(&nd.path);
1102 out_unlock:
1103 exp_writeunlock();
1104 out:
1105 return err;
1106 }
1107
1108 /*
1109 * Unexport a file system. The export entry has already
1110 * been removed from the client's list of exported fs's.
1111 */
1112 static void
1113 exp_do_unexport(svc_export *unexp)
1114 {
1115 unexp->h.expiry_time = get_seconds()-1;
1116 svc_export_cache.nextcheck = get_seconds();
1117 exp_unhash(unexp);
1118 exp_fsid_unhash(unexp);
1119 }
1120
1121
1122 /*
1123 * unexport syscall.
1124 */
1125 int
1126 exp_unexport(struct nfsctl_export *nxp)
1127 {
1128 struct auth_domain *dom;
1129 svc_export *exp;
1130 struct nameidata nd;
1131 int err;
1132
1133 /* Consistency check */
1134 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1135 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1136 return -EINVAL;
1137
1138 exp_writelock();
1139
1140 err = -EINVAL;
1141 dom = auth_domain_find(nxp->ex_client);
1142 if (!dom) {
1143 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1144 goto out_unlock;
1145 }
1146
1147 err = path_lookup(nxp->ex_path, 0, &nd);
1148 if (err)
1149 goto out_domain;
1150
1151 err = -EINVAL;
1152 exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
1153 path_put(&nd.path);
1154 if (IS_ERR(exp))
1155 goto out_domain;
1156
1157 exp_do_unexport(exp);
1158 exp_put(exp);
1159 err = 0;
1160
1161 out_domain:
1162 auth_domain_put(dom);
1163 cache_flush();
1164 out_unlock:
1165 exp_writeunlock();
1166 return err;
1167 }
1168
1169 /*
1170 * Obtain the root fh on behalf of a client.
1171 * This could be done in user space, but I feel that it adds some safety
1172 * since its harder to fool a kernel module than a user space program.
1173 */
1174 int
1175 exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1176 {
1177 struct svc_export *exp;
1178 struct nameidata nd;
1179 struct inode *inode;
1180 struct svc_fh fh;
1181 int err;
1182
1183 err = -EPERM;
1184 /* NB: we probably ought to check that it's NUL-terminated */
1185 if (path_lookup(path, 0, &nd)) {
1186 printk("nfsd: exp_rootfh path not found %s", path);
1187 return err;
1188 }
1189 inode = nd.path.dentry->d_inode;
1190
1191 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1192 path, nd.path.dentry, clp->name,
1193 inode->i_sb->s_id, inode->i_ino);
1194 exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
1195 if (IS_ERR(exp)) {
1196 err = PTR_ERR(exp);
1197 goto out;
1198 }
1199
1200 /*
1201 * fh must be initialized before calling fh_compose
1202 */
1203 fh_init(&fh, maxsize);
1204 if (fh_compose(&fh, exp, nd.path.dentry, NULL))
1205 err = -EINVAL;
1206 else
1207 err = 0;
1208 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1209 fh_put(&fh);
1210 exp_put(exp);
1211 out:
1212 path_put(&nd.path);
1213 return err;
1214 }
1215
1216 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1217 u32 *fsidv, struct cache_req *reqp)
1218 {
1219 struct svc_export *exp;
1220 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1221 if (IS_ERR(ek))
1222 return ERR_CAST(ek);
1223
1224 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
1225 cache_put(&ek->h, &svc_expkey_cache);
1226
1227 if (IS_ERR(exp))
1228 return ERR_CAST(exp);
1229 return exp;
1230 }
1231
1232 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1233 {
1234 struct exp_flavor_info *f;
1235 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1236
1237 /* legacy gss-only clients are always OK: */
1238 if (exp->ex_client == rqstp->rq_gssclient)
1239 return 0;
1240 /* ip-address based client; check sec= export option: */
1241 for (f = exp->ex_flavors; f < end; f++) {
1242 if (f->pseudoflavor == rqstp->rq_flavor)
1243 return 0;
1244 }
1245 /* defaults in absence of sec= options: */
1246 if (exp->ex_nflavors == 0) {
1247 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1248 rqstp->rq_flavor == RPC_AUTH_UNIX)
1249 return 0;
1250 }
1251 return nfserr_wrongsec;
1252 }
1253
1254 /*
1255 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1256 * auth_unix client) if it's available and has secinfo information;
1257 * otherwise, will try to use rq_gssclient.
1258 *
1259 * Called from functions that handle requests; functions that do work on
1260 * behalf of mountd are passed a single client name to use, and should
1261 * use exp_get_by_name() or exp_find().
1262 */
1263 struct svc_export *
1264 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1265 struct dentry *dentry)
1266 {
1267 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1268
1269 if (rqstp->rq_client == NULL)
1270 goto gss;
1271
1272 /* First try the auth_unix client: */
1273 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1274 &rqstp->rq_chandle);
1275 if (PTR_ERR(exp) == -ENOENT)
1276 goto gss;
1277 if (IS_ERR(exp))
1278 return exp;
1279 /* If it has secinfo, assume there are no gss/... clients */
1280 if (exp->ex_nflavors > 0)
1281 return exp;
1282 gss:
1283 /* Otherwise, try falling back on gss client */
1284 if (rqstp->rq_gssclient == NULL)
1285 return exp;
1286 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1287 &rqstp->rq_chandle);
1288 if (PTR_ERR(gssexp) == -ENOENT)
1289 return exp;
1290 if (!IS_ERR(exp))
1291 exp_put(exp);
1292 return gssexp;
1293 }
1294
1295 struct svc_export *
1296 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1297 {
1298 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1299
1300 if (rqstp->rq_client == NULL)
1301 goto gss;
1302
1303 /* First try the auth_unix client: */
1304 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1305 if (PTR_ERR(exp) == -ENOENT)
1306 goto gss;
1307 if (IS_ERR(exp))
1308 return exp;
1309 /* If it has secinfo, assume there are no gss/... clients */
1310 if (exp->ex_nflavors > 0)
1311 return exp;
1312 gss:
1313 /* Otherwise, try falling back on gss client */
1314 if (rqstp->rq_gssclient == NULL)
1315 return exp;
1316 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1317 &rqstp->rq_chandle);
1318 if (PTR_ERR(gssexp) == -ENOENT)
1319 return exp;
1320 if (!IS_ERR(exp))
1321 exp_put(exp);
1322 return gssexp;
1323 }
1324
1325 struct svc_export *
1326 rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1327 struct dentry *dentry)
1328 {
1329 struct svc_export *exp;
1330
1331 dget(dentry);
1332 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1333
1334 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1335 struct dentry *parent;
1336
1337 parent = dget_parent(dentry);
1338 dput(dentry);
1339 dentry = parent;
1340 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1341 }
1342 dput(dentry);
1343 return exp;
1344 }
1345
1346 /*
1347 * Called when we need the filehandle for the root of the pseudofs,
1348 * for a given NFSv4 client. The root is defined to be the
1349 * export point with fsid==0
1350 */
1351 __be32
1352 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1353 {
1354 struct svc_export *exp;
1355 __be32 rv;
1356 u32 fsidv[2];
1357
1358 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1359
1360 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1361 if (IS_ERR(exp))
1362 return nfserrno(PTR_ERR(exp));
1363 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1364 if (rv)
1365 goto out;
1366 rv = check_nfsd_access(exp, rqstp);
1367 out:
1368 exp_put(exp);
1369 return rv;
1370 }
1371
1372 /* Iterator */
1373
1374 static void *e_start(struct seq_file *m, loff_t *pos)
1375 __acquires(svc_export_cache.hash_lock)
1376 {
1377 loff_t n = *pos;
1378 unsigned hash, export;
1379 struct cache_head *ch;
1380
1381 exp_readlock();
1382 read_lock(&svc_export_cache.hash_lock);
1383 if (!n--)
1384 return SEQ_START_TOKEN;
1385 hash = n >> 32;
1386 export = n & ((1LL<<32) - 1);
1387
1388
1389 for (ch=export_table[hash]; ch; ch=ch->next)
1390 if (!export--)
1391 return ch;
1392 n &= ~((1LL<<32) - 1);
1393 do {
1394 hash++;
1395 n += 1LL<<32;
1396 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1397 if (hash >= EXPORT_HASHMAX)
1398 return NULL;
1399 *pos = n+1;
1400 return export_table[hash];
1401 }
1402
1403 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1404 {
1405 struct cache_head *ch = p;
1406 int hash = (*pos >> 32);
1407
1408 if (p == SEQ_START_TOKEN)
1409 hash = 0;
1410 else if (ch->next == NULL) {
1411 hash++;
1412 *pos += 1LL<<32;
1413 } else {
1414 ++*pos;
1415 return ch->next;
1416 }
1417 *pos &= ~((1LL<<32) - 1);
1418 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1419 hash++;
1420 *pos += 1LL<<32;
1421 }
1422 if (hash >= EXPORT_HASHMAX)
1423 return NULL;
1424 ++*pos;
1425 return export_table[hash];
1426 }
1427
1428 static void e_stop(struct seq_file *m, void *p)
1429 __releases(svc_export_cache.hash_lock)
1430 {
1431 read_unlock(&svc_export_cache.hash_lock);
1432 exp_readunlock();
1433 }
1434
1435 static struct flags {
1436 int flag;
1437 char *name[2];
1438 } expflags[] = {
1439 { NFSEXP_READONLY, {"ro", "rw"}},
1440 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1441 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1442 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1443 { NFSEXP_ASYNC, {"async", "sync"}},
1444 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1445 { NFSEXP_NOHIDE, {"nohide", ""}},
1446 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1447 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1448 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1449 #ifdef MSNFS
1450 { NFSEXP_MSNFS, {"msnfs", ""}},
1451 #endif
1452 { 0, {"", ""}}
1453 };
1454
1455 static void show_expflags(struct seq_file *m, int flags, int mask)
1456 {
1457 struct flags *flg;
1458 int state, first = 0;
1459
1460 for (flg = expflags; flg->flag; flg++) {
1461 if (flg->flag & ~mask)
1462 continue;
1463 state = (flg->flag & flags) ? 0 : 1;
1464 if (*flg->name[state])
1465 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1466 }
1467 }
1468
1469 static void show_secinfo_flags(struct seq_file *m, int flags)
1470 {
1471 seq_printf(m, ",");
1472 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1473 }
1474
1475 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1476 {
1477 struct exp_flavor_info *f;
1478 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1479 int lastflags = 0, first = 0;
1480
1481 if (exp->ex_nflavors == 0)
1482 return;
1483 for (f = exp->ex_flavors; f < end; f++) {
1484 if (first || f->flags != lastflags) {
1485 if (!first)
1486 show_secinfo_flags(m, lastflags);
1487 seq_printf(m, ",sec=%d", f->pseudoflavor);
1488 lastflags = f->flags;
1489 } else {
1490 seq_printf(m, ":%d", f->pseudoflavor);
1491 }
1492 }
1493 show_secinfo_flags(m, lastflags);
1494 }
1495
1496 static void exp_flags(struct seq_file *m, int flag, int fsid,
1497 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1498 {
1499 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1500 if (flag & NFSEXP_FSID)
1501 seq_printf(m, ",fsid=%d", fsid);
1502 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1503 seq_printf(m, ",anonuid=%u", anonu);
1504 if (anong != (gid_t)-2 && anong != (0x10000-2))
1505 seq_printf(m, ",anongid=%u", anong);
1506 if (fsloc && fsloc->locations_count > 0) {
1507 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1508 int i;
1509
1510 seq_printf(m, ",%s=", loctype);
1511 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1512 seq_putc(m, '@');
1513 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1514 for (i = 1; i < fsloc->locations_count; i++) {
1515 seq_putc(m, ';');
1516 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1517 seq_putc(m, '@');
1518 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1519 }
1520 }
1521 }
1522
1523 static int e_show(struct seq_file *m, void *p)
1524 {
1525 struct cache_head *cp = p;
1526 struct svc_export *exp = container_of(cp, struct svc_export, h);
1527
1528 if (p == SEQ_START_TOKEN) {
1529 seq_puts(m, "# Version 1.1\n");
1530 seq_puts(m, "# Path Client(Flags) # IPs\n");
1531 return 0;
1532 }
1533
1534 cache_get(&exp->h);
1535 if (cache_check(&svc_export_cache, &exp->h, NULL))
1536 return 0;
1537 cache_put(&exp->h, &svc_export_cache);
1538 return svc_export_show(m, &svc_export_cache, cp);
1539 }
1540
1541 struct seq_operations nfs_exports_op = {
1542 .start = e_start,
1543 .next = e_next,
1544 .stop = e_stop,
1545 .show = e_show,
1546 };
1547
1548 /*
1549 * Add or modify a client.
1550 * Change requests may involve the list of host addresses. The list of
1551 * exports and possibly existing uid maps are left untouched.
1552 */
1553 int
1554 exp_addclient(struct nfsctl_client *ncp)
1555 {
1556 struct auth_domain *dom;
1557 int i, err;
1558
1559 /* First, consistency check. */
1560 err = -EINVAL;
1561 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1562 goto out;
1563 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1564 goto out;
1565
1566 /* Lock the hashtable */
1567 exp_writelock();
1568
1569 dom = unix_domain_find(ncp->cl_ident);
1570
1571 err = -ENOMEM;
1572 if (!dom)
1573 goto out_unlock;
1574
1575 /* Insert client into hashtable. */
1576 for (i = 0; i < ncp->cl_naddr; i++)
1577 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1578
1579 auth_unix_forget_old(dom);
1580 auth_domain_put(dom);
1581
1582 err = 0;
1583
1584 out_unlock:
1585 exp_writeunlock();
1586 out:
1587 return err;
1588 }
1589
1590 /*
1591 * Delete a client given an identifier.
1592 */
1593 int
1594 exp_delclient(struct nfsctl_client *ncp)
1595 {
1596 int err;
1597 struct auth_domain *dom;
1598
1599 err = -EINVAL;
1600 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1601 goto out;
1602
1603 /* Lock the hashtable */
1604 exp_writelock();
1605
1606 dom = auth_domain_find(ncp->cl_ident);
1607 /* just make sure that no addresses work
1608 * and that it will expire soon
1609 */
1610 if (dom) {
1611 err = auth_unix_forget_old(dom);
1612 auth_domain_put(dom);
1613 }
1614
1615 exp_writeunlock();
1616 out:
1617 return err;
1618 }
1619
1620 /*
1621 * Verify that string is non-empty and does not exceed max length.
1622 */
1623 static int
1624 exp_verify_string(char *cp, int max)
1625 {
1626 int i;
1627
1628 for (i = 0; i < max; i++)
1629 if (!cp[i])
1630 return i;
1631 cp[i] = 0;
1632 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1633 return 0;
1634 }
1635
1636 /*
1637 * Initialize the exports module.
1638 */
1639 int
1640 nfsd_export_init(void)
1641 {
1642 int rv;
1643 dprintk("nfsd: initializing export module.\n");
1644
1645 rv = cache_register(&svc_export_cache);
1646 if (rv)
1647 return rv;
1648 rv = cache_register(&svc_expkey_cache);
1649 if (rv)
1650 cache_unregister(&svc_export_cache);
1651 return rv;
1652
1653 }
1654
1655 /*
1656 * Flush exports table - called when last nfsd thread is killed
1657 */
1658 void
1659 nfsd_export_flush(void)
1660 {
1661 exp_writelock();
1662 cache_purge(&svc_expkey_cache);
1663 cache_purge(&svc_export_cache);
1664 exp_writeunlock();
1665 }
1666
1667 /*
1668 * Shutdown the exports module.
1669 */
1670 void
1671 nfsd_export_shutdown(void)
1672 {
1673
1674 dprintk("nfsd: shutting down export module.\n");
1675
1676 exp_writelock();
1677
1678 cache_unregister(&svc_expkey_cache);
1679 cache_unregister(&svc_export_cache);
1680 svcauth_unix_purge();
1681
1682 exp_writeunlock();
1683 dprintk("nfsd: export shutdown complete.\n");
1684 }
x86 "subsystem" repository