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nfsd struct path use: exp_get_by_name()
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfsd / export.c
blob3f6d51b8c3efed8d6548c35d961250af77c9ccfc
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 #include <net/ipv6.h>
39
40 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
41
42 typedef struct auth_domain svc_client;
43 typedef struct svc_export svc_export;
44
45 static void exp_do_unexport(svc_export *unexp);
46 static int exp_verify_string(char *cp, int max);
47
48 /*
49 * We have two caches.
50 * One maps client+vfsmnt+dentry to export options - the export map
51 * The other maps client+filehandle-fragment to export options. - the expkey map
52 *
53 * The export options are actually stored in the first map, and the
54 * second map contains a reference to the entry in the first map.
55 */
56
57 #define EXPKEY_HASHBITS 8
58 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
59 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
60 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
61
62 static void expkey_put(struct kref *ref)
63 {
64 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
65
66 if (test_bit(CACHE_VALID, &key->h.flags) &&
67 !test_bit(CACHE_NEGATIVE, &key->h.flags))
68 path_put(&key->ek_path);
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 = NULL;
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)
111 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 len = qword_get(&mesg, buf, PAGE_SIZE);
156 if (len < 0)
157 goto out;
158 dprintk("Path seems to be <%s>\n", buf);
159 err = 0;
160 if (len == 0) {
161 set_bit(CACHE_NEGATIVE, &key.h.flags);
162 ek = svc_expkey_update(&key, ek);
163 if (!ek)
164 err = -ENOMEM;
165 } else {
166 err = kern_path(buf, 0, &key.ek_path);
167 if (err)
168 goto out;
169
170 dprintk("Found the path %s\n", buf);
171
172 ek = svc_expkey_update(&key, ek);
173 if (!ek)
174 err = -ENOMEM;
175 path_put(&key.ek_path);
176 }
177 cache_flush();
178 out:
179 if (ek)
180 cache_put(&ek->h, &svc_expkey_cache);
181 if (dom)
182 auth_domain_put(dom);
183 kfree(buf);
184 return err;
185 }
186
187 static int expkey_show(struct seq_file *m,
188 struct cache_detail *cd,
189 struct cache_head *h)
190 {
191 struct svc_expkey *ek ;
192 int i;
193
194 if (h ==NULL) {
195 seq_puts(m, "#domain fsidtype fsid [path]\n");
196 return 0;
197 }
198 ek = container_of(h, struct svc_expkey, h);
199 seq_printf(m, "%s %d 0x", ek->ek_client->name,
200 ek->ek_fsidtype);
201 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
202 seq_printf(m, "%08x", ek->ek_fsid[i]);
203 if (test_bit(CACHE_VALID, &h->flags) &&
204 !test_bit(CACHE_NEGATIVE, &h->flags)) {
205 seq_printf(m, " ");
206 seq_path(m, &ek->ek_path, "\\ \t\n");
207 }
208 seq_printf(m, "\n");
209 return 0;
210 }
211
212 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
213 {
214 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
215 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
216
217 if (orig->ek_fsidtype != new->ek_fsidtype ||
218 orig->ek_client != new->ek_client ||
219 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
220 return 0;
221 return 1;
222 }
223
224 static inline void expkey_init(struct cache_head *cnew,
225 struct cache_head *citem)
226 {
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
229
230 kref_get(&item->ek_client->ref);
231 new->ek_client = item->ek_client;
232 new->ek_fsidtype = item->ek_fsidtype;
233
234 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
235 }
236
237 static inline void expkey_update(struct cache_head *cnew,
238 struct cache_head *citem)
239 {
240 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
241 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
242
243 new->ek_path = item->ek_path;
244 path_get(&item->ek_path);
245 }
246
247 static struct cache_head *expkey_alloc(void)
248 {
249 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
250 if (i)
251 return &i->h;
252 else
253 return NULL;
254 }
255
256 static struct cache_detail svc_expkey_cache = {
257 .owner = THIS_MODULE,
258 .hash_size = EXPKEY_HASHMAX,
259 .hash_table = expkey_table,
260 .name = "nfsd.fh",
261 .cache_put = expkey_put,
262 .cache_request = expkey_request,
263 .cache_parse = expkey_parse,
264 .cache_show = expkey_show,
265 .match = expkey_match,
266 .init = expkey_init,
267 .update = expkey_update,
268 .alloc = expkey_alloc,
269 };
270
271 static struct svc_expkey *
272 svc_expkey_lookup(struct svc_expkey *item)
273 {
274 struct cache_head *ch;
275 int hash = item->ek_fsidtype;
276 char * cp = (char*)item->ek_fsid;
277 int len = key_len(item->ek_fsidtype);
278
279 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
280 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
281 hash &= EXPKEY_HASHMASK;
282
283 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
284 hash);
285 if (ch)
286 return container_of(ch, struct svc_expkey, h);
287 else
288 return NULL;
289 }
290
291 static struct svc_expkey *
292 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
293 {
294 struct cache_head *ch;
295 int hash = new->ek_fsidtype;
296 char * cp = (char*)new->ek_fsid;
297 int len = key_len(new->ek_fsidtype);
298
299 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
300 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
301 hash &= EXPKEY_HASHMASK;
302
303 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
304 &old->h, hash);
305 if (ch)
306 return container_of(ch, struct svc_expkey, h);
307 else
308 return NULL;
309 }
310
311
312 #define EXPORT_HASHBITS 8
313 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
314 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
315
316 static struct cache_head *export_table[EXPORT_HASHMAX];
317
318 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
319 {
320 int i;
321
322 for (i = 0; i < fsloc->locations_count; i++) {
323 kfree(fsloc->locations[i].path);
324 kfree(fsloc->locations[i].hosts);
325 }
326 kfree(fsloc->locations);
327 }
328
329 static void svc_export_put(struct kref *ref)
330 {
331 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
332 path_put(&exp->ex_path);
333 auth_domain_put(exp->ex_client);
334 kfree(exp->ex_pathname);
335 nfsd4_fslocs_free(&exp->ex_fslocs);
336 kfree(exp);
337 }
338
339 static void svc_export_request(struct cache_detail *cd,
340 struct cache_head *h,
341 char **bpp, int *blen)
342 {
343 /* client path */
344 struct svc_export *exp = container_of(h, struct svc_export, h);
345 char *pth;
346
347 qword_add(bpp, blen, exp->ex_client->name);
348 pth = d_path(&exp->ex_path, *bpp, *blen);
349 if (IS_ERR(pth)) {
350 /* is this correct? */
351 (*bpp)[0] = '\n';
352 return;
353 }
354 qword_add(bpp, blen, pth);
355 (*bpp)[-1] = '\n';
356 }
357
358 static struct svc_export *svc_export_update(struct svc_export *new,
359 struct svc_export *old);
360 static struct svc_export *svc_export_lookup(struct svc_export *);
361
362 static int check_export(struct inode *inode, int flags, unsigned char *uuid)
363 {
364
365 /* We currently export only dirs and regular files.
366 * This is what umountd does.
367 */
368 if (!S_ISDIR(inode->i_mode) &&
369 !S_ISREG(inode->i_mode))
370 return -ENOTDIR;
371
372 /* There are two requirements on a filesystem to be exportable.
373 * 1: We must be able to identify the filesystem from a number.
374 * either a device number (so FS_REQUIRES_DEV needed)
375 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
376 * 2: We must be able to find an inode from a filehandle.
377 * This means that s_export_op must be set.
378 */
379 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
380 !(flags & NFSEXP_FSID) &&
381 uuid == NULL) {
382 dprintk("exp_export: export of non-dev fs without fsid\n");
383 return -EINVAL;
384 }
385
386 if (!inode->i_sb->s_export_op ||
387 !inode->i_sb->s_export_op->fh_to_dentry) {
388 dprintk("exp_export: export of invalid fs type.\n");
389 return -EINVAL;
390 }
391
392 return 0;
393
394 }
395
396 #ifdef CONFIG_NFSD_V4
397
398 static int
399 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
400 {
401 int len;
402 int migrated, i, err;
403
404 /* listsize */
405 err = get_int(mesg, &fsloc->locations_count);
406 if (err)
407 return err;
408 if (fsloc->locations_count > MAX_FS_LOCATIONS)
409 return -EINVAL;
410 if (fsloc->locations_count == 0)
411 return 0;
412
413 fsloc->locations = kzalloc(fsloc->locations_count
414 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
415 if (!fsloc->locations)
416 return -ENOMEM;
417 for (i=0; i < fsloc->locations_count; i++) {
418 /* colon separated host list */
419 err = -EINVAL;
420 len = qword_get(mesg, buf, PAGE_SIZE);
421 if (len <= 0)
422 goto out_free_all;
423 err = -ENOMEM;
424 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
425 if (!fsloc->locations[i].hosts)
426 goto out_free_all;
427 err = -EINVAL;
428 /* slash separated path component list */
429 len = qword_get(mesg, buf, PAGE_SIZE);
430 if (len <= 0)
431 goto out_free_all;
432 err = -ENOMEM;
433 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
434 if (!fsloc->locations[i].path)
435 goto out_free_all;
436 }
437 /* migrated */
438 err = get_int(mesg, &migrated);
439 if (err)
440 goto out_free_all;
441 err = -EINVAL;
442 if (migrated < 0 || migrated > 1)
443 goto out_free_all;
444 fsloc->migrated = migrated;
445 return 0;
446 out_free_all:
447 nfsd4_fslocs_free(fsloc);
448 return err;
449 }
450
451 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
452 {
453 int listsize, err;
454 struct exp_flavor_info *f;
455
456 err = get_int(mesg, &listsize);
457 if (err)
458 return err;
459 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
460 return -EINVAL;
461
462 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
463 err = get_int(mesg, &f->pseudoflavor);
464 if (err)
465 return err;
466 /*
467 * Just a quick sanity check; we could also try to check
468 * whether this pseudoflavor is supported, but at worst
469 * an unsupported pseudoflavor on the export would just
470 * be a pseudoflavor that won't match the flavor of any
471 * authenticated request. The administrator will
472 * probably discover the problem when someone fails to
473 * authenticate.
474 */
475 if (f->pseudoflavor < 0)
476 return -EINVAL;
477 err = get_int(mesg, &f->flags);
478 if (err)
479 return err;
480 /* Only some flags are allowed to differ between flavors: */
481 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
482 return -EINVAL;
483 }
484 exp->ex_nflavors = listsize;
485 return 0;
486 }
487
488 #else /* CONFIG_NFSD_V4 */
489 static inline int
490 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
491 static inline int
492 secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
493 #endif
494
495 static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
496 {
497 /* client path expiry [flags anonuid anongid fsid] */
498 char *buf;
499 int len;
500 int err;
501 struct auth_domain *dom = NULL;
502 struct svc_export exp = {}, *expp;
503 int an_int;
504
505 if (mesg[mlen-1] != '\n')
506 return -EINVAL;
507 mesg[mlen-1] = 0;
508
509 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
510 if (!buf)
511 return -ENOMEM;
512
513 /* client */
514 err = -EINVAL;
515 len = qword_get(&mesg, buf, PAGE_SIZE);
516 if (len <= 0)
517 goto out;
518
519 err = -ENOENT;
520 dom = auth_domain_find(buf);
521 if (!dom)
522 goto out;
523
524 /* path */
525 err = -EINVAL;
526 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
527 goto out1;
528
529 err = kern_path(buf, 0, &exp.ex_path);
530 if (err)
531 goto out1;
532
533 exp.ex_client = dom;
534
535 err = -ENOMEM;
536 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
537 if (!exp.ex_pathname)
538 goto out2;
539
540 /* expiry */
541 err = -EINVAL;
542 exp.h.expiry_time = get_expiry(&mesg);
543 if (exp.h.expiry_time == 0)
544 goto out3;
545
546 /* flags */
547 err = get_int(&mesg, &an_int);
548 if (err == -ENOENT) {
549 err = 0;
550 set_bit(CACHE_NEGATIVE, &exp.h.flags);
551 } else {
552 if (err || an_int < 0)
553 goto out3;
554 exp.ex_flags= an_int;
555
556 /* anon uid */
557 err = get_int(&mesg, &an_int);
558 if (err)
559 goto out3;
560 exp.ex_anon_uid= an_int;
561
562 /* anon gid */
563 err = get_int(&mesg, &an_int);
564 if (err)
565 goto out3;
566 exp.ex_anon_gid= an_int;
567
568 /* fsid */
569 err = get_int(&mesg, &an_int);
570 if (err)
571 goto out3;
572 exp.ex_fsid = an_int;
573
574 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
575 if (strcmp(buf, "fsloc") == 0)
576 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
577 else if (strcmp(buf, "uuid") == 0) {
578 /* expect a 16 byte uuid encoded as \xXXXX... */
579 len = qword_get(&mesg, buf, PAGE_SIZE);
580 if (len != 16)
581 err = -EINVAL;
582 else {
583 exp.ex_uuid =
584 kmemdup(buf, 16, GFP_KERNEL);
585 if (exp.ex_uuid == NULL)
586 err = -ENOMEM;
587 }
588 } else if (strcmp(buf, "secinfo") == 0)
589 err = secinfo_parse(&mesg, buf, &exp);
590 else
591 /* quietly ignore unknown words and anything
592 * following. Newer user-space can try to set
593 * new values, then see what the result was.
594 */
595 break;
596 if (err)
597 goto out4;
598 }
599
600 err = check_export(exp.ex_path.dentry->d_inode, exp.ex_flags,
601 exp.ex_uuid);
602 if (err)
603 goto out4;
604 }
605
606 expp = svc_export_lookup(&exp);
607 if (expp)
608 expp = svc_export_update(&exp, expp);
609 else
610 err = -ENOMEM;
611 cache_flush();
612 if (expp == NULL)
613 err = -ENOMEM;
614 else
615 exp_put(expp);
616 out4:
617 nfsd4_fslocs_free(&exp.ex_fslocs);
618 kfree(exp.ex_uuid);
619 out3:
620 kfree(exp.ex_pathname);
621 out2:
622 path_put(&exp.ex_path);
623 out1:
624 auth_domain_put(dom);
625 out:
626 kfree(buf);
627 return err;
628 }
629
630 static void exp_flags(struct seq_file *m, int flag, int fsid,
631 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
632 static void show_secinfo(struct seq_file *m, struct svc_export *exp);
633
634 static int svc_export_show(struct seq_file *m,
635 struct cache_detail *cd,
636 struct cache_head *h)
637 {
638 struct svc_export *exp ;
639
640 if (h ==NULL) {
641 seq_puts(m, "#path domain(flags)\n");
642 return 0;
643 }
644 exp = container_of(h, struct svc_export, h);
645 seq_path(m, &exp->ex_path, " \t\n\\");
646 seq_putc(m, '\t');
647 seq_escape(m, exp->ex_client->name, " \t\n\\");
648 seq_putc(m, '(');
649 if (test_bit(CACHE_VALID, &h->flags) &&
650 !test_bit(CACHE_NEGATIVE, &h->flags)) {
651 exp_flags(m, exp->ex_flags, exp->ex_fsid,
652 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
653 if (exp->ex_uuid) {
654 int i;
655 seq_puts(m, ",uuid=");
656 for (i=0; i<16; i++) {
657 if ((i&3) == 0 && i)
658 seq_putc(m, ':');
659 seq_printf(m, "%02x", exp->ex_uuid[i]);
660 }
661 }
662 show_secinfo(m, exp);
663 }
664 seq_puts(m, ")\n");
665 return 0;
666 }
667 static int svc_export_match(struct cache_head *a, struct cache_head *b)
668 {
669 struct svc_export *orig = container_of(a, struct svc_export, h);
670 struct svc_export *new = container_of(b, struct svc_export, h);
671 return orig->ex_client == new->ex_client &&
672 orig->ex_path.dentry == new->ex_path.dentry &&
673 orig->ex_path.mnt == new->ex_path.mnt;
674 }
675
676 static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
677 {
678 struct svc_export *new = container_of(cnew, struct svc_export, h);
679 struct svc_export *item = container_of(citem, struct svc_export, h);
680
681 kref_get(&item->ex_client->ref);
682 new->ex_client = item->ex_client;
683 new->ex_path.dentry = dget(item->ex_path.dentry);
684 new->ex_path.mnt = mntget(item->ex_path.mnt);
685 new->ex_pathname = NULL;
686 new->ex_fslocs.locations = NULL;
687 new->ex_fslocs.locations_count = 0;
688 new->ex_fslocs.migrated = 0;
689 }
690
691 static void export_update(struct cache_head *cnew, struct cache_head *citem)
692 {
693 struct svc_export *new = container_of(cnew, struct svc_export, h);
694 struct svc_export *item = container_of(citem, struct svc_export, h);
695 int i;
696
697 new->ex_flags = item->ex_flags;
698 new->ex_anon_uid = item->ex_anon_uid;
699 new->ex_anon_gid = item->ex_anon_gid;
700 new->ex_fsid = item->ex_fsid;
701 new->ex_uuid = item->ex_uuid;
702 item->ex_uuid = NULL;
703 new->ex_pathname = item->ex_pathname;
704 item->ex_pathname = NULL;
705 new->ex_fslocs.locations = item->ex_fslocs.locations;
706 item->ex_fslocs.locations = NULL;
707 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
708 item->ex_fslocs.locations_count = 0;
709 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
710 item->ex_fslocs.migrated = 0;
711 new->ex_nflavors = item->ex_nflavors;
712 for (i = 0; i < MAX_SECINFO_LIST; i++) {
713 new->ex_flavors[i] = item->ex_flavors[i];
714 }
715 }
716
717 static struct cache_head *svc_export_alloc(void)
718 {
719 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
720 if (i)
721 return &i->h;
722 else
723 return NULL;
724 }
725
726 struct cache_detail svc_export_cache = {
727 .owner = THIS_MODULE,
728 .hash_size = EXPORT_HASHMAX,
729 .hash_table = export_table,
730 .name = "nfsd.export",
731 .cache_put = svc_export_put,
732 .cache_request = svc_export_request,
733 .cache_parse = svc_export_parse,
734 .cache_show = svc_export_show,
735 .match = svc_export_match,
736 .init = svc_export_init,
737 .update = export_update,
738 .alloc = svc_export_alloc,
739 };
740
741 static struct svc_export *
742 svc_export_lookup(struct svc_export *exp)
743 {
744 struct cache_head *ch;
745 int hash;
746 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
747 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
748 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
749
750 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
751 hash);
752 if (ch)
753 return container_of(ch, struct svc_export, h);
754 else
755 return NULL;
756 }
757
758 static struct svc_export *
759 svc_export_update(struct svc_export *new, struct svc_export *old)
760 {
761 struct cache_head *ch;
762 int hash;
763 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
764 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
765 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
766
767 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
768 &old->h,
769 hash);
770 if (ch)
771 return container_of(ch, struct svc_export, h);
772 else
773 return NULL;
774 }
775
776
777 static struct svc_expkey *
778 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
779 {
780 struct svc_expkey key, *ek;
781 int err;
782
783 if (!clp)
784 return ERR_PTR(-ENOENT);
785
786 key.ek_client = clp;
787 key.ek_fsidtype = fsid_type;
788 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
789
790 ek = svc_expkey_lookup(&key);
791 if (ek == NULL)
792 return ERR_PTR(-ENOMEM);
793 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
794 if (err)
795 return ERR_PTR(err);
796 return ek;
797 }
798
799 static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
800 struct svc_export *exp)
801 {
802 struct svc_expkey key, *ek;
803
804 key.ek_client = clp;
805 key.ek_fsidtype = fsid_type;
806 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
807 key.ek_path = exp->ex_path;
808 key.h.expiry_time = NEVER;
809 key.h.flags = 0;
810
811 ek = svc_expkey_lookup(&key);
812 if (ek)
813 ek = svc_expkey_update(&key,ek);
814 if (ek) {
815 cache_put(&ek->h, &svc_expkey_cache);
816 return 0;
817 }
818 return -ENOMEM;
819 }
820
821 /*
822 * Find the client's export entry matching xdev/xino.
823 */
824 static inline struct svc_expkey *
825 exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
826 {
827 u32 fsidv[3];
828
829 if (old_valid_dev(dev)) {
830 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
831 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
832 }
833 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
834 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
835 }
836
837 /*
838 * Find the client's export entry matching fsid
839 */
840 static inline struct svc_expkey *
841 exp_get_fsid_key(svc_client *clp, int fsid)
842 {
843 u32 fsidv[2];
844
845 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
846
847 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
848 }
849
850 static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
851 struct cache_req *reqp)
852 {
853 struct svc_export *exp, key;
854 int err;
855
856 if (!clp)
857 return ERR_PTR(-ENOENT);
858
859 key.ex_client = clp;
860 key.ex_path = *path;
861
862 exp = svc_export_lookup(&key);
863 if (exp == NULL)
864 return ERR_PTR(-ENOMEM);
865 err = cache_check(&svc_export_cache, &exp->h, reqp);
866 if (err)
867 return ERR_PTR(err);
868 return exp;
869 }
870
871 /*
872 * Find the export entry for a given dentry.
873 */
874 static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
875 struct dentry *dentry,
876 struct cache_req *reqp)
877 {
878 struct path path = {.mnt = mnt, .dentry = dentry};
879 svc_export *exp;
880
881 dget(path.dentry);
882 exp = exp_get_by_name(clp, &path, reqp);
883
884 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path.dentry)) {
885 struct dentry *parent = dget_parent(path.dentry);
886 dput(path.dentry);
887 path.dentry = parent;
888 exp = exp_get_by_name(clp, &path, reqp);
889 }
890 dput(path.dentry);
891 return exp;
892 }
893
894 /*
895 * Hashtable locking. Write locks are placed only by user processes
896 * wanting to modify export information.
897 * Write locking only done in this file. Read locking
898 * needed externally.
899 */
900
901 static DECLARE_RWSEM(hash_sem);
902
903 void
904 exp_readlock(void)
905 {
906 down_read(&hash_sem);
907 }
908
909 static inline void
910 exp_writelock(void)
911 {
912 down_write(&hash_sem);
913 }
914
915 void
916 exp_readunlock(void)
917 {
918 up_read(&hash_sem);
919 }
920
921 static inline void
922 exp_writeunlock(void)
923 {
924 up_write(&hash_sem);
925 }
926
927 static void exp_fsid_unhash(struct svc_export *exp)
928 {
929 struct svc_expkey *ek;
930
931 if ((exp->ex_flags & NFSEXP_FSID) == 0)
932 return;
933
934 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
935 if (!IS_ERR(ek)) {
936 ek->h.expiry_time = get_seconds()-1;
937 cache_put(&ek->h, &svc_expkey_cache);
938 }
939 svc_expkey_cache.nextcheck = get_seconds();
940 }
941
942 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
943 {
944 u32 fsid[2];
945
946 if ((exp->ex_flags & NFSEXP_FSID) == 0)
947 return 0;
948
949 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
950 return exp_set_key(clp, FSID_NUM, fsid, exp);
951 }
952
953 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
954 {
955 u32 fsid[2];
956 struct inode *inode = exp->ex_path.dentry->d_inode;
957 dev_t dev = inode->i_sb->s_dev;
958
959 if (old_valid_dev(dev)) {
960 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
961 return exp_set_key(clp, FSID_DEV, fsid, exp);
962 }
963 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
964 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
965 }
966
967 static void exp_unhash(struct svc_export *exp)
968 {
969 struct svc_expkey *ek;
970 struct inode *inode = exp->ex_path.dentry->d_inode;
971
972 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
973 if (!IS_ERR(ek)) {
974 ek->h.expiry_time = get_seconds()-1;
975 cache_put(&ek->h, &svc_expkey_cache);
976 }
977 svc_expkey_cache.nextcheck = get_seconds();
978 }
979
980 /*
981 * Export a file system.
982 */
983 int
984 exp_export(struct nfsctl_export *nxp)
985 {
986 svc_client *clp;
987 struct svc_export *exp = NULL;
988 struct svc_export new;
989 struct svc_expkey *fsid_key = NULL;
990 struct path path;
991 int err;
992
993 /* Consistency check */
994 err = -EINVAL;
995 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
996 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
997 goto out;
998
999 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1000 nxp->ex_client, nxp->ex_path,
1001 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1002 nxp->ex_flags);
1003
1004 /* Try to lock the export table for update */
1005 exp_writelock();
1006
1007 /* Look up client info */
1008 if (!(clp = auth_domain_find(nxp->ex_client)))
1009 goto out_unlock;
1010
1011
1012 /* Look up the dentry */
1013 err = kern_path(nxp->ex_path, 0, &path);
1014 if (err)
1015 goto out_put_clp;
1016 err = -EINVAL;
1017
1018 exp = exp_get_by_name(clp, &path, NULL);
1019
1020 memset(&new, 0, sizeof(new));
1021
1022 /* must make sure there won't be an ex_fsid clash */
1023 if ((nxp->ex_flags & NFSEXP_FSID) &&
1024 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1025 fsid_key->ek_path.mnt &&
1026 (fsid_key->ek_path.mnt != path.mnt ||
1027 fsid_key->ek_path.dentry != path.dentry))
1028 goto finish;
1029
1030 if (!IS_ERR(exp)) {
1031 /* just a flags/id/fsid update */
1032
1033 exp_fsid_unhash(exp);
1034 exp->ex_flags = nxp->ex_flags;
1035 exp->ex_anon_uid = nxp->ex_anon_uid;
1036 exp->ex_anon_gid = nxp->ex_anon_gid;
1037 exp->ex_fsid = nxp->ex_dev;
1038
1039 err = exp_fsid_hash(clp, exp);
1040 goto finish;
1041 }
1042
1043 err = check_export(path.dentry->d_inode, nxp->ex_flags, NULL);
1044 if (err) goto finish;
1045
1046 err = -ENOMEM;
1047
1048 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1049
1050 new.h.expiry_time = NEVER;
1051 new.h.flags = 0;
1052 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1053 if (!new.ex_pathname)
1054 goto finish;
1055 new.ex_client = clp;
1056 new.ex_path = path;
1057 new.ex_flags = nxp->ex_flags;
1058 new.ex_anon_uid = nxp->ex_anon_uid;
1059 new.ex_anon_gid = nxp->ex_anon_gid;
1060 new.ex_fsid = nxp->ex_dev;
1061
1062 exp = svc_export_lookup(&new);
1063 if (exp)
1064 exp = svc_export_update(&new, exp);
1065
1066 if (!exp)
1067 goto finish;
1068
1069 if (exp_hash(clp, exp) ||
1070 exp_fsid_hash(clp, exp)) {
1071 /* failed to create at least one index */
1072 exp_do_unexport(exp);
1073 cache_flush();
1074 } else
1075 err = 0;
1076 finish:
1077 kfree(new.ex_pathname);
1078 if (exp)
1079 exp_put(exp);
1080 if (fsid_key && !IS_ERR(fsid_key))
1081 cache_put(&fsid_key->h, &svc_expkey_cache);
1082 path_put(&path);
1083 out_put_clp:
1084 auth_domain_put(clp);
1085 out_unlock:
1086 exp_writeunlock();
1087 out:
1088 return err;
1089 }
1090
1091 /*
1092 * Unexport a file system. The export entry has already
1093 * been removed from the client's list of exported fs's.
1094 */
1095 static void
1096 exp_do_unexport(svc_export *unexp)
1097 {
1098 unexp->h.expiry_time = get_seconds()-1;
1099 svc_export_cache.nextcheck = get_seconds();
1100 exp_unhash(unexp);
1101 exp_fsid_unhash(unexp);
1102 }
1103
1104
1105 /*
1106 * unexport syscall.
1107 */
1108 int
1109 exp_unexport(struct nfsctl_export *nxp)
1110 {
1111 struct auth_domain *dom;
1112 svc_export *exp;
1113 struct path path;
1114 int err;
1115
1116 /* Consistency check */
1117 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1118 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1119 return -EINVAL;
1120
1121 exp_writelock();
1122
1123 err = -EINVAL;
1124 dom = auth_domain_find(nxp->ex_client);
1125 if (!dom) {
1126 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1127 goto out_unlock;
1128 }
1129
1130 err = kern_path(nxp->ex_path, 0, &path);
1131 if (err)
1132 goto out_domain;
1133
1134 err = -EINVAL;
1135 exp = exp_get_by_name(dom, &path, NULL);
1136 path_put(&path);
1137 if (IS_ERR(exp))
1138 goto out_domain;
1139
1140 exp_do_unexport(exp);
1141 exp_put(exp);
1142 err = 0;
1143
1144 out_domain:
1145 auth_domain_put(dom);
1146 cache_flush();
1147 out_unlock:
1148 exp_writeunlock();
1149 return err;
1150 }
1151
1152 /*
1153 * Obtain the root fh on behalf of a client.
1154 * This could be done in user space, but I feel that it adds some safety
1155 * since its harder to fool a kernel module than a user space program.
1156 */
1157 int
1158 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1159 {
1160 struct svc_export *exp;
1161 struct path path;
1162 struct inode *inode;
1163 struct svc_fh fh;
1164 int err;
1165
1166 err = -EPERM;
1167 /* NB: we probably ought to check that it's NUL-terminated */
1168 if (kern_path(name, 0, &path)) {
1169 printk("nfsd: exp_rootfh path not found %s", name);
1170 return err;
1171 }
1172 inode = path.dentry->d_inode;
1173
1174 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1175 name, path.dentry, clp->name,
1176 inode->i_sb->s_id, inode->i_ino);
1177 exp = exp_parent(clp, path.mnt, path.dentry, NULL);
1178 if (IS_ERR(exp)) {
1179 err = PTR_ERR(exp);
1180 goto out;
1181 }
1182
1183 /*
1184 * fh must be initialized before calling fh_compose
1185 */
1186 fh_init(&fh, maxsize);
1187 if (fh_compose(&fh, exp, path.dentry, NULL))
1188 err = -EINVAL;
1189 else
1190 err = 0;
1191 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1192 fh_put(&fh);
1193 exp_put(exp);
1194 out:
1195 path_put(&path);
1196 return err;
1197 }
1198
1199 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1200 u32 *fsidv, struct cache_req *reqp)
1201 {
1202 struct svc_export *exp;
1203 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1204 if (IS_ERR(ek))
1205 return ERR_CAST(ek);
1206
1207 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1208 cache_put(&ek->h, &svc_expkey_cache);
1209
1210 if (IS_ERR(exp))
1211 return ERR_CAST(exp);
1212 return exp;
1213 }
1214
1215 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1216 {
1217 struct exp_flavor_info *f;
1218 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1219
1220 /* legacy gss-only clients are always OK: */
1221 if (exp->ex_client == rqstp->rq_gssclient)
1222 return 0;
1223 /* ip-address based client; check sec= export option: */
1224 for (f = exp->ex_flavors; f < end; f++) {
1225 if (f->pseudoflavor == rqstp->rq_flavor)
1226 return 0;
1227 }
1228 /* defaults in absence of sec= options: */
1229 if (exp->ex_nflavors == 0) {
1230 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1231 rqstp->rq_flavor == RPC_AUTH_UNIX)
1232 return 0;
1233 }
1234 return nfserr_wrongsec;
1235 }
1236
1237 /*
1238 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1239 * auth_unix client) if it's available and has secinfo information;
1240 * otherwise, will try to use rq_gssclient.
1241 *
1242 * Called from functions that handle requests; functions that do work on
1243 * behalf of mountd are passed a single client name to use, and should
1244 * use exp_get_by_name() or exp_find().
1245 */
1246 struct svc_export *
1247 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1248 struct dentry *dentry)
1249 {
1250 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1251 struct path path = {.mnt = mnt, .dentry = dentry};
1252
1253 if (rqstp->rq_client == NULL)
1254 goto gss;
1255
1256 /* First try the auth_unix client: */
1257 exp = exp_get_by_name(rqstp->rq_client, &path,
1258 &rqstp->rq_chandle);
1259 if (PTR_ERR(exp) == -ENOENT)
1260 goto gss;
1261 if (IS_ERR(exp))
1262 return exp;
1263 /* If it has secinfo, assume there are no gss/... clients */
1264 if (exp->ex_nflavors > 0)
1265 return exp;
1266 gss:
1267 /* Otherwise, try falling back on gss client */
1268 if (rqstp->rq_gssclient == NULL)
1269 return exp;
1270 gssexp = exp_get_by_name(rqstp->rq_gssclient, &path,
1271 &rqstp->rq_chandle);
1272 if (PTR_ERR(gssexp) == -ENOENT)
1273 return exp;
1274 if (!IS_ERR(exp))
1275 exp_put(exp);
1276 return gssexp;
1277 }
1278
1279 struct svc_export *
1280 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1281 {
1282 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1283
1284 if (rqstp->rq_client == NULL)
1285 goto gss;
1286
1287 /* First try the auth_unix client: */
1288 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1289 if (PTR_ERR(exp) == -ENOENT)
1290 goto gss;
1291 if (IS_ERR(exp))
1292 return exp;
1293 /* If it has secinfo, assume there are no gss/... clients */
1294 if (exp->ex_nflavors > 0)
1295 return exp;
1296 gss:
1297 /* Otherwise, try falling back on gss client */
1298 if (rqstp->rq_gssclient == NULL)
1299 return exp;
1300 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1301 &rqstp->rq_chandle);
1302 if (PTR_ERR(gssexp) == -ENOENT)
1303 return exp;
1304 if (!IS_ERR(exp))
1305 exp_put(exp);
1306 return gssexp;
1307 }
1308
1309 struct svc_export *
1310 rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1311 struct dentry *dentry)
1312 {
1313 struct svc_export *exp;
1314
1315 dget(dentry);
1316 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1317
1318 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1319 struct dentry *parent;
1320
1321 parent = dget_parent(dentry);
1322 dput(dentry);
1323 dentry = parent;
1324 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1325 }
1326 dput(dentry);
1327 return exp;
1328 }
1329
1330 /*
1331 * Called when we need the filehandle for the root of the pseudofs,
1332 * for a given NFSv4 client. The root is defined to be the
1333 * export point with fsid==0
1334 */
1335 __be32
1336 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1337 {
1338 struct svc_export *exp;
1339 __be32 rv;
1340 u32 fsidv[2];
1341
1342 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1343
1344 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
1345 if (IS_ERR(exp))
1346 return nfserrno(PTR_ERR(exp));
1347 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1348 if (rv)
1349 goto out;
1350 rv = check_nfsd_access(exp, rqstp);
1351 out:
1352 exp_put(exp);
1353 return rv;
1354 }
1355
1356 /* Iterator */
1357
1358 static void *e_start(struct seq_file *m, loff_t *pos)
1359 __acquires(svc_export_cache.hash_lock)
1360 {
1361 loff_t n = *pos;
1362 unsigned hash, export;
1363 struct cache_head *ch;
1364
1365 exp_readlock();
1366 read_lock(&svc_export_cache.hash_lock);
1367 if (!n--)
1368 return SEQ_START_TOKEN;
1369 hash = n >> 32;
1370 export = n & ((1LL<<32) - 1);
1371
1372
1373 for (ch=export_table[hash]; ch; ch=ch->next)
1374 if (!export--)
1375 return ch;
1376 n &= ~((1LL<<32) - 1);
1377 do {
1378 hash++;
1379 n += 1LL<<32;
1380 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1381 if (hash >= EXPORT_HASHMAX)
1382 return NULL;
1383 *pos = n+1;
1384 return export_table[hash];
1385 }
1386
1387 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1388 {
1389 struct cache_head *ch = p;
1390 int hash = (*pos >> 32);
1391
1392 if (p == SEQ_START_TOKEN)
1393 hash = 0;
1394 else if (ch->next == NULL) {
1395 hash++;
1396 *pos += 1LL<<32;
1397 } else {
1398 ++*pos;
1399 return ch->next;
1400 }
1401 *pos &= ~((1LL<<32) - 1);
1402 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1403 hash++;
1404 *pos += 1LL<<32;
1405 }
1406 if (hash >= EXPORT_HASHMAX)
1407 return NULL;
1408 ++*pos;
1409 return export_table[hash];
1410 }
1411
1412 static void e_stop(struct seq_file *m, void *p)
1413 __releases(svc_export_cache.hash_lock)
1414 {
1415 read_unlock(&svc_export_cache.hash_lock);
1416 exp_readunlock();
1417 }
1418
1419 static struct flags {
1420 int flag;
1421 char *name[2];
1422 } expflags[] = {
1423 { NFSEXP_READONLY, {"ro", "rw"}},
1424 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1425 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1426 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1427 { NFSEXP_ASYNC, {"async", "sync"}},
1428 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1429 { NFSEXP_NOHIDE, {"nohide", ""}},
1430 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1431 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1432 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1433 #ifdef MSNFS
1434 { NFSEXP_MSNFS, {"msnfs", ""}},
1435 #endif
1436 { 0, {"", ""}}
1437 };
1438
1439 static void show_expflags(struct seq_file *m, int flags, int mask)
1440 {
1441 struct flags *flg;
1442 int state, first = 0;
1443
1444 for (flg = expflags; flg->flag; flg++) {
1445 if (flg->flag & ~mask)
1446 continue;
1447 state = (flg->flag & flags) ? 0 : 1;
1448 if (*flg->name[state])
1449 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1450 }
1451 }
1452
1453 static void show_secinfo_flags(struct seq_file *m, int flags)
1454 {
1455 seq_printf(m, ",");
1456 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1457 }
1458
1459 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1460 {
1461 struct exp_flavor_info *f;
1462 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1463 int lastflags = 0, first = 0;
1464
1465 if (exp->ex_nflavors == 0)
1466 return;
1467 for (f = exp->ex_flavors; f < end; f++) {
1468 if (first || f->flags != lastflags) {
1469 if (!first)
1470 show_secinfo_flags(m, lastflags);
1471 seq_printf(m, ",sec=%d", f->pseudoflavor);
1472 lastflags = f->flags;
1473 } else {
1474 seq_printf(m, ":%d", f->pseudoflavor);
1475 }
1476 }
1477 show_secinfo_flags(m, lastflags);
1478 }
1479
1480 static void exp_flags(struct seq_file *m, int flag, int fsid,
1481 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1482 {
1483 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1484 if (flag & NFSEXP_FSID)
1485 seq_printf(m, ",fsid=%d", fsid);
1486 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1487 seq_printf(m, ",anonuid=%u", anonu);
1488 if (anong != (gid_t)-2 && anong != (0x10000-2))
1489 seq_printf(m, ",anongid=%u", anong);
1490 if (fsloc && fsloc->locations_count > 0) {
1491 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1492 int i;
1493
1494 seq_printf(m, ",%s=", loctype);
1495 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1496 seq_putc(m, '@');
1497 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1498 for (i = 1; i < fsloc->locations_count; i++) {
1499 seq_putc(m, ';');
1500 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1501 seq_putc(m, '@');
1502 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1503 }
1504 }
1505 }
1506
1507 static int e_show(struct seq_file *m, void *p)
1508 {
1509 struct cache_head *cp = p;
1510 struct svc_export *exp = container_of(cp, struct svc_export, h);
1511
1512 if (p == SEQ_START_TOKEN) {
1513 seq_puts(m, "# Version 1.1\n");
1514 seq_puts(m, "# Path Client(Flags) # IPs\n");
1515 return 0;
1516 }
1517
1518 cache_get(&exp->h);
1519 if (cache_check(&svc_export_cache, &exp->h, NULL))
1520 return 0;
1521 cache_put(&exp->h, &svc_export_cache);
1522 return svc_export_show(m, &svc_export_cache, cp);
1523 }
1524
1525 struct seq_operations nfs_exports_op = {
1526 .start = e_start,
1527 .next = e_next,
1528 .stop = e_stop,
1529 .show = e_show,
1530 };
1531
1532 /*
1533 * Add or modify a client.
1534 * Change requests may involve the list of host addresses. The list of
1535 * exports and possibly existing uid maps are left untouched.
1536 */
1537 int
1538 exp_addclient(struct nfsctl_client *ncp)
1539 {
1540 struct auth_domain *dom;
1541 int i, err;
1542 struct in6_addr addr6;
1543
1544 /* First, consistency check. */
1545 err = -EINVAL;
1546 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1547 goto out;
1548 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1549 goto out;
1550
1551 /* Lock the hashtable */
1552 exp_writelock();
1553
1554 dom = unix_domain_find(ncp->cl_ident);
1555
1556 err = -ENOMEM;
1557 if (!dom)
1558 goto out_unlock;
1559
1560 /* Insert client into hashtable. */
1561 for (i = 0; i < ncp->cl_naddr; i++) {
1562 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1563 auth_unix_add_addr(&addr6, dom);
1564 }
1565 auth_unix_forget_old(dom);
1566 auth_domain_put(dom);
1567
1568 err = 0;
1569
1570 out_unlock:
1571 exp_writeunlock();
1572 out:
1573 return err;
1574 }
1575
1576 /*
1577 * Delete a client given an identifier.
1578 */
1579 int
1580 exp_delclient(struct nfsctl_client *ncp)
1581 {
1582 int err;
1583 struct auth_domain *dom;
1584
1585 err = -EINVAL;
1586 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1587 goto out;
1588
1589 /* Lock the hashtable */
1590 exp_writelock();
1591
1592 dom = auth_domain_find(ncp->cl_ident);
1593 /* just make sure that no addresses work
1594 * and that it will expire soon
1595 */
1596 if (dom) {
1597 err = auth_unix_forget_old(dom);
1598 auth_domain_put(dom);
1599 }
1600
1601 exp_writeunlock();
1602 out:
1603 return err;
1604 }
1605
1606 /*
1607 * Verify that string is non-empty and does not exceed max length.
1608 */
1609 static int
1610 exp_verify_string(char *cp, int max)
1611 {
1612 int i;
1613
1614 for (i = 0; i < max; i++)
1615 if (!cp[i])
1616 return i;
1617 cp[i] = 0;
1618 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1619 return 0;
1620 }
1621
1622 /*
1623 * Initialize the exports module.
1624 */
1625 int
1626 nfsd_export_init(void)
1627 {
1628 int rv;
1629 dprintk("nfsd: initializing export module.\n");
1630
1631 rv = cache_register(&svc_export_cache);
1632 if (rv)
1633 return rv;
1634 rv = cache_register(&svc_expkey_cache);
1635 if (rv)
1636 cache_unregister(&svc_export_cache);
1637 return rv;
1638
1639 }
1640
1641 /*
1642 * Flush exports table - called when last nfsd thread is killed
1643 */
1644 void
1645 nfsd_export_flush(void)
1646 {
1647 exp_writelock();
1648 cache_purge(&svc_expkey_cache);
1649 cache_purge(&svc_export_cache);
1650 exp_writeunlock();
1651 }
1652
1653 /*
1654 * Shutdown the exports module.
1655 */
1656 void
1657 nfsd_export_shutdown(void)
1658 {
1659
1660 dprintk("nfsd: shutting down export module.\n");
1661
1662 exp_writelock();
1663
1664 cache_unregister(&svc_expkey_cache);
1665 cache_unregister(&svc_export_cache);
1666 svcauth_unix_purge();
1667
1668 exp_writeunlock();
1669 dprintk("nfsd: export shutdown complete.\n");
1670 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree