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x86, ioapic: Fix io_apic_redir_entries to return the number of entries.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / nfsd / export.c
blob872a5ef550c7733c79650180ed453aaec25e7752
1 #define MSNFS /* HACK HACK */
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
20 #include <linux/nfsd/syscall.h>
21 #include <net/ipv6.h>
22
23 #include "nfsd.h"
24 #include "nfsfh.h"
25
26 #define NFSDDBG_FACILITY NFSDDBG_EXPORT
27
28 typedef struct auth_domain svc_client;
29 typedef struct svc_export svc_export;
30
31 static void exp_do_unexport(svc_export *unexp);
32 static int exp_verify_string(char *cp, int max);
33
34 /*
35 * We have two caches.
36 * One maps client+vfsmnt+dentry to export options - the export map
37 * The other maps client+filehandle-fragment to export options. - the expkey map
38 *
39 * The export options are actually stored in the first map, and the
40 * second map contains a reference to the entry in the first map.
41 */
42
43 #define EXPKEY_HASHBITS 8
44 #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
45 #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
46 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
47
48 static void expkey_put(struct kref *ref)
49 {
50 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
51
52 if (test_bit(CACHE_VALID, &key->h.flags) &&
53 !test_bit(CACHE_NEGATIVE, &key->h.flags))
54 path_put(&key->ek_path);
55 auth_domain_put(key->ek_client);
56 kfree(key);
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 int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
75 {
76 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
77 }
78
79 static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
80 static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
81 static struct cache_detail svc_expkey_cache;
82
83 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
84 {
85 /* client fsidtype fsid [path] */
86 char *buf;
87 int len;
88 struct auth_domain *dom = NULL;
89 int err;
90 int fsidtype;
91 char *ep;
92 struct svc_expkey key;
93 struct svc_expkey *ek = NULL;
94
95 if (mesg[mlen-1] != '\n')
96 return -EINVAL;
97 mesg[mlen-1] = 0;
98
99 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
100 err = -ENOMEM;
101 if (!buf)
102 goto out;
103
104 err = -EINVAL;
105 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
106 goto out;
107
108 err = -ENOENT;
109 dom = auth_domain_find(buf);
110 if (!dom)
111 goto out;
112 dprintk("found domain %s\n", buf);
113
114 err = -EINVAL;
115 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
116 goto out;
117 fsidtype = simple_strtoul(buf, &ep, 10);
118 if (*ep)
119 goto out;
120 dprintk("found fsidtype %d\n", fsidtype);
121 if (key_len(fsidtype)==0) /* invalid type */
122 goto out;
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 goto out;
125 dprintk("found fsid length %d\n", len);
126 if (len != key_len(fsidtype))
127 goto out;
128
129 /* OK, we seem to have a valid key */
130 key.h.flags = 0;
131 key.h.expiry_time = get_expiry(&mesg);
132 if (key.h.expiry_time == 0)
133 goto out;
134
135 key.ek_client = dom;
136 key.ek_fsidtype = fsidtype;
137 memcpy(key.ek_fsid, buf, len);
138
139 ek = svc_expkey_lookup(&key);
140 err = -ENOMEM;
141 if (!ek)
142 goto out;
143
144 /* now we want a pathname, or empty meaning NEGATIVE */
145 err = -EINVAL;
146 len = qword_get(&mesg, buf, PAGE_SIZE);
147 if (len < 0)
148 goto out;
149 dprintk("Path seems to be <%s>\n", buf);
150 err = 0;
151 if (len == 0) {
152 set_bit(CACHE_NEGATIVE, &key.h.flags);
153 ek = svc_expkey_update(&key, ek);
154 if (!ek)
155 err = -ENOMEM;
156 } else {
157 err = kern_path(buf, 0, &key.ek_path);
158 if (err)
159 goto out;
160
161 dprintk("Found the path %s\n", buf);
162
163 ek = svc_expkey_update(&key, ek);
164 if (!ek)
165 err = -ENOMEM;
166 path_put(&key.ek_path);
167 }
168 cache_flush();
169 out:
170 if (ek)
171 cache_put(&ek->h, &svc_expkey_cache);
172 if (dom)
173 auth_domain_put(dom);
174 kfree(buf);
175 return err;
176 }
177
178 static int expkey_show(struct seq_file *m,
179 struct cache_detail *cd,
180 struct cache_head *h)
181 {
182 struct svc_expkey *ek ;
183 int i;
184
185 if (h ==NULL) {
186 seq_puts(m, "#domain fsidtype fsid [path]\n");
187 return 0;
188 }
189 ek = container_of(h, struct svc_expkey, h);
190 seq_printf(m, "%s %d 0x", ek->ek_client->name,
191 ek->ek_fsidtype);
192 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
193 seq_printf(m, "%08x", ek->ek_fsid[i]);
194 if (test_bit(CACHE_VALID, &h->flags) &&
195 !test_bit(CACHE_NEGATIVE, &h->flags)) {
196 seq_printf(m, " ");
197 seq_path(m, &ek->ek_path, "\\ \t\n");
198 }
199 seq_printf(m, "\n");
200 return 0;
201 }
202
203 static inline int expkey_match (struct cache_head *a, struct cache_head *b)
204 {
205 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
206 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
207
208 if (orig->ek_fsidtype != new->ek_fsidtype ||
209 orig->ek_client != new->ek_client ||
210 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
211 return 0;
212 return 1;
213 }
214
215 static inline void expkey_init(struct cache_head *cnew,
216 struct cache_head *citem)
217 {
218 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
219 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
220
221 kref_get(&item->ek_client->ref);
222 new->ek_client = item->ek_client;
223 new->ek_fsidtype = item->ek_fsidtype;
224
225 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
226 }
227
228 static inline void expkey_update(struct cache_head *cnew,
229 struct cache_head *citem)
230 {
231 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
232 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
233
234 new->ek_path = item->ek_path;
235 path_get(&item->ek_path);
236 }
237
238 static struct cache_head *expkey_alloc(void)
239 {
240 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
241 if (i)
242 return &i->h;
243 else
244 return NULL;
245 }
246
247 static struct cache_detail svc_expkey_cache = {
248 .owner = THIS_MODULE,
249 .hash_size = EXPKEY_HASHMAX,
250 .hash_table = expkey_table,
251 .name = "nfsd.fh",
252 .cache_put = expkey_put,
253 .cache_upcall = expkey_upcall,
254 .cache_parse = expkey_parse,
255 .cache_show = expkey_show,
256 .match = expkey_match,
257 .init = expkey_init,
258 .update = expkey_update,
259 .alloc = expkey_alloc,
260 };
261
262 static struct svc_expkey *
263 svc_expkey_lookup(struct svc_expkey *item)
264 {
265 struct cache_head *ch;
266 int hash = item->ek_fsidtype;
267 char * cp = (char*)item->ek_fsid;
268 int len = key_len(item->ek_fsidtype);
269
270 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
271 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
272 hash &= EXPKEY_HASHMASK;
273
274 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
275 hash);
276 if (ch)
277 return container_of(ch, struct svc_expkey, h);
278 else
279 return NULL;
280 }
281
282 static struct svc_expkey *
283 svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
284 {
285 struct cache_head *ch;
286 int hash = new->ek_fsidtype;
287 char * cp = (char*)new->ek_fsid;
288 int len = key_len(new->ek_fsidtype);
289
290 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
291 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
292 hash &= EXPKEY_HASHMASK;
293
294 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
295 &old->h, hash);
296 if (ch)
297 return container_of(ch, struct svc_expkey, h);
298 else
299 return NULL;
300 }
301
302
303 #define EXPORT_HASHBITS 8
304 #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
305 #define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
306
307 static struct cache_head *export_table[EXPORT_HASHMAX];
308
309 static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
310 {
311 int i;
312
313 for (i = 0; i < fsloc->locations_count; i++) {
314 kfree(fsloc->locations[i].path);
315 kfree(fsloc->locations[i].hosts);
316 }
317 kfree(fsloc->locations);
318 }
319
320 static void svc_export_put(struct kref *ref)
321 {
322 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
323 path_put(&exp->ex_path);
324 auth_domain_put(exp->ex_client);
325 kfree(exp->ex_pathname);
326 nfsd4_fslocs_free(&exp->ex_fslocs);
327 kfree(exp);
328 }
329
330 static void svc_export_request(struct cache_detail *cd,
331 struct cache_head *h,
332 char **bpp, int *blen)
333 {
334 /* client path */
335 struct svc_export *exp = container_of(h, struct svc_export, h);
336 char *pth;
337
338 qword_add(bpp, blen, exp->ex_client->name);
339 pth = d_path(&exp->ex_path, *bpp, *blen);
340 if (IS_ERR(pth)) {
341 /* is this correct? */
342 (*bpp)[0] = '\n';
343 return;
344 }
345 qword_add(bpp, blen, pth);
346 (*bpp)[-1] = '\n';
347 }
348
349 static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
350 {
351 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
352 }
353
354 static struct svc_export *svc_export_update(struct svc_export *new,
355 struct svc_export *old);
356 static struct svc_export *svc_export_lookup(struct svc_export *);
357
358 static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
359 {
360
361 /*
362 * We currently export only dirs, regular files, and (for v4
363 * pseudoroot) symlinks.
364 */
365 if (!S_ISDIR(inode->i_mode) &&
366 !S_ISLNK(inode->i_mode) &&
367 !S_ISREG(inode->i_mode))
368 return -ENOTDIR;
369
370 /*
371 * Mountd should never pass down a writeable V4ROOT export, but,
372 * just to make sure:
373 */
374 if (*flags & NFSEXP_V4ROOT)
375 *flags |= NFSEXP_READONLY;
376
377 /* There are two requirements on a filesystem to be exportable.
378 * 1: We must be able to identify the filesystem from a number.
379 * either a device number (so FS_REQUIRES_DEV needed)
380 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
381 * 2: We must be able to find an inode from a filehandle.
382 * This means that s_export_op must be set.
383 */
384 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
385 !(*flags & NFSEXP_FSID) &&
386 uuid == NULL) {
387 dprintk("exp_export: export of non-dev fs without fsid\n");
388 return -EINVAL;
389 }
390
391 if (!inode->i_sb->s_export_op ||
392 !inode->i_sb->s_export_op->fh_to_dentry) {
393 dprintk("exp_export: export of invalid fs type.\n");
394 return -EINVAL;
395 }
396
397 return 0;
398
399 }
400
401 #ifdef CONFIG_NFSD_V4
402
403 static int
404 fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
405 {
406 int len;
407 int migrated, i, err;
408
409 /* listsize */
410 err = get_int(mesg, &fsloc->locations_count);
411 if (err)
412 return err;
413 if (fsloc->locations_count > MAX_FS_LOCATIONS)
414 return -EINVAL;
415 if (fsloc->locations_count == 0)
416 return 0;
417
418 fsloc->locations = kzalloc(fsloc->locations_count
419 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
420 if (!fsloc->locations)
421 return -ENOMEM;
422 for (i=0; i < fsloc->locations_count; i++) {
423 /* colon separated host list */
424 err = -EINVAL;
425 len = qword_get(mesg, buf, PAGE_SIZE);
426 if (len <= 0)
427 goto out_free_all;
428 err = -ENOMEM;
429 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
430 if (!fsloc->locations[i].hosts)
431 goto out_free_all;
432 err = -EINVAL;
433 /* slash separated path component list */
434 len = qword_get(mesg, buf, PAGE_SIZE);
435 if (len <= 0)
436 goto out_free_all;
437 err = -ENOMEM;
438 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
439 if (!fsloc->locations[i].path)
440 goto out_free_all;
441 }
442 /* migrated */
443 err = get_int(mesg, &migrated);
444 if (err)
445 goto out_free_all;
446 err = -EINVAL;
447 if (migrated < 0 || migrated > 1)
448 goto out_free_all;
449 fsloc->migrated = migrated;
450 return 0;
451 out_free_all:
452 nfsd4_fslocs_free(fsloc);
453 return err;
454 }
455
456 static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
457 {
458 int listsize, err;
459 struct exp_flavor_info *f;
460
461 err = get_int(mesg, &listsize);
462 if (err)
463 return err;
464 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
465 return -EINVAL;
466
467 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
468 err = get_int(mesg, &f->pseudoflavor);
469 if (err)
470 return err;
471 /*
472 * XXX: It would be nice to also check whether this
473 * pseudoflavor is supported, so we can discover the
474 * problem at export time instead of when a client fails
475 * to authenticate.
476 */
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_upcall = svc_export_upcall,
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 path *path)
875 {
876 struct dentry *saved = dget(path->dentry);
877 svc_export *exp = exp_get_by_name(clp, path, NULL);
878
879 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
880 struct dentry *parent = dget_parent(path->dentry);
881 dput(path->dentry);
882 path->dentry = parent;
883 exp = exp_get_by_name(clp, path, NULL);
884 }
885 dput(path->dentry);
886 path->dentry = saved;
887 return exp;
888 }
889
890 /*
891 * Hashtable locking. Write locks are placed only by user processes
892 * wanting to modify export information.
893 * Write locking only done in this file. Read locking
894 * needed externally.
895 */
896
897 static DECLARE_RWSEM(hash_sem);
898
899 void
900 exp_readlock(void)
901 {
902 down_read(&hash_sem);
903 }
904
905 static inline void
906 exp_writelock(void)
907 {
908 down_write(&hash_sem);
909 }
910
911 void
912 exp_readunlock(void)
913 {
914 up_read(&hash_sem);
915 }
916
917 static inline void
918 exp_writeunlock(void)
919 {
920 up_write(&hash_sem);
921 }
922
923 static void exp_fsid_unhash(struct svc_export *exp)
924 {
925 struct svc_expkey *ek;
926
927 if ((exp->ex_flags & NFSEXP_FSID) == 0)
928 return;
929
930 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
931 if (!IS_ERR(ek)) {
932 ek->h.expiry_time = get_seconds()-1;
933 cache_put(&ek->h, &svc_expkey_cache);
934 }
935 svc_expkey_cache.nextcheck = get_seconds();
936 }
937
938 static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
939 {
940 u32 fsid[2];
941
942 if ((exp->ex_flags & NFSEXP_FSID) == 0)
943 return 0;
944
945 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
946 return exp_set_key(clp, FSID_NUM, fsid, exp);
947 }
948
949 static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
950 {
951 u32 fsid[2];
952 struct inode *inode = exp->ex_path.dentry->d_inode;
953 dev_t dev = inode->i_sb->s_dev;
954
955 if (old_valid_dev(dev)) {
956 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
957 return exp_set_key(clp, FSID_DEV, fsid, exp);
958 }
959 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
960 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
961 }
962
963 static void exp_unhash(struct svc_export *exp)
964 {
965 struct svc_expkey *ek;
966 struct inode *inode = exp->ex_path.dentry->d_inode;
967
968 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
969 if (!IS_ERR(ek)) {
970 ek->h.expiry_time = get_seconds()-1;
971 cache_put(&ek->h, &svc_expkey_cache);
972 }
973 svc_expkey_cache.nextcheck = get_seconds();
974 }
975
976 /*
977 * Export a file system.
978 */
979 int
980 exp_export(struct nfsctl_export *nxp)
981 {
982 svc_client *clp;
983 struct svc_export *exp = NULL;
984 struct svc_export new;
985 struct svc_expkey *fsid_key = NULL;
986 struct path path;
987 int err;
988
989 /* Consistency check */
990 err = -EINVAL;
991 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
992 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
993 goto out;
994
995 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
996 nxp->ex_client, nxp->ex_path,
997 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
998 nxp->ex_flags);
999
1000 /* Try to lock the export table for update */
1001 exp_writelock();
1002
1003 /* Look up client info */
1004 if (!(clp = auth_domain_find(nxp->ex_client)))
1005 goto out_unlock;
1006
1007
1008 /* Look up the dentry */
1009 err = kern_path(nxp->ex_path, 0, &path);
1010 if (err)
1011 goto out_put_clp;
1012 err = -EINVAL;
1013
1014 exp = exp_get_by_name(clp, &path, NULL);
1015
1016 memset(&new, 0, sizeof(new));
1017
1018 /* must make sure there won't be an ex_fsid clash */
1019 if ((nxp->ex_flags & NFSEXP_FSID) &&
1020 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
1021 fsid_key->ek_path.mnt &&
1022 (fsid_key->ek_path.mnt != path.mnt ||
1023 fsid_key->ek_path.dentry != path.dentry))
1024 goto finish;
1025
1026 if (!IS_ERR(exp)) {
1027 /* just a flags/id/fsid update */
1028
1029 exp_fsid_unhash(exp);
1030 exp->ex_flags = nxp->ex_flags;
1031 exp->ex_anon_uid = nxp->ex_anon_uid;
1032 exp->ex_anon_gid = nxp->ex_anon_gid;
1033 exp->ex_fsid = nxp->ex_dev;
1034
1035 err = exp_fsid_hash(clp, exp);
1036 goto finish;
1037 }
1038
1039 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
1040 if (err) goto finish;
1041
1042 err = -ENOMEM;
1043
1044 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1045
1046 new.h.expiry_time = NEVER;
1047 new.h.flags = 0;
1048 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1049 if (!new.ex_pathname)
1050 goto finish;
1051 new.ex_client = clp;
1052 new.ex_path = path;
1053 new.ex_flags = nxp->ex_flags;
1054 new.ex_anon_uid = nxp->ex_anon_uid;
1055 new.ex_anon_gid = nxp->ex_anon_gid;
1056 new.ex_fsid = nxp->ex_dev;
1057
1058 exp = svc_export_lookup(&new);
1059 if (exp)
1060 exp = svc_export_update(&new, exp);
1061
1062 if (!exp)
1063 goto finish;
1064
1065 if (exp_hash(clp, exp) ||
1066 exp_fsid_hash(clp, exp)) {
1067 /* failed to create at least one index */
1068 exp_do_unexport(exp);
1069 cache_flush();
1070 } else
1071 err = 0;
1072 finish:
1073 kfree(new.ex_pathname);
1074 if (exp)
1075 exp_put(exp);
1076 if (fsid_key && !IS_ERR(fsid_key))
1077 cache_put(&fsid_key->h, &svc_expkey_cache);
1078 path_put(&path);
1079 out_put_clp:
1080 auth_domain_put(clp);
1081 out_unlock:
1082 exp_writeunlock();
1083 out:
1084 return err;
1085 }
1086
1087 /*
1088 * Unexport a file system. The export entry has already
1089 * been removed from the client's list of exported fs's.
1090 */
1091 static void
1092 exp_do_unexport(svc_export *unexp)
1093 {
1094 unexp->h.expiry_time = get_seconds()-1;
1095 svc_export_cache.nextcheck = get_seconds();
1096 exp_unhash(unexp);
1097 exp_fsid_unhash(unexp);
1098 }
1099
1100
1101 /*
1102 * unexport syscall.
1103 */
1104 int
1105 exp_unexport(struct nfsctl_export *nxp)
1106 {
1107 struct auth_domain *dom;
1108 svc_export *exp;
1109 struct path path;
1110 int err;
1111
1112 /* Consistency check */
1113 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1114 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1115 return -EINVAL;
1116
1117 exp_writelock();
1118
1119 err = -EINVAL;
1120 dom = auth_domain_find(nxp->ex_client);
1121 if (!dom) {
1122 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1123 goto out_unlock;
1124 }
1125
1126 err = kern_path(nxp->ex_path, 0, &path);
1127 if (err)
1128 goto out_domain;
1129
1130 err = -EINVAL;
1131 exp = exp_get_by_name(dom, &path, NULL);
1132 path_put(&path);
1133 if (IS_ERR(exp))
1134 goto out_domain;
1135
1136 exp_do_unexport(exp);
1137 exp_put(exp);
1138 err = 0;
1139
1140 out_domain:
1141 auth_domain_put(dom);
1142 cache_flush();
1143 out_unlock:
1144 exp_writeunlock();
1145 return err;
1146 }
1147
1148 /*
1149 * Obtain the root fh on behalf of a client.
1150 * This could be done in user space, but I feel that it adds some safety
1151 * since its harder to fool a kernel module than a user space program.
1152 */
1153 int
1154 exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
1155 {
1156 struct svc_export *exp;
1157 struct path path;
1158 struct inode *inode;
1159 struct svc_fh fh;
1160 int err;
1161
1162 err = -EPERM;
1163 /* NB: we probably ought to check that it's NUL-terminated */
1164 if (kern_path(name, 0, &path)) {
1165 printk("nfsd: exp_rootfh path not found %s", name);
1166 return err;
1167 }
1168 inode = path.dentry->d_inode;
1169
1170 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1171 name, path.dentry, clp->name,
1172 inode->i_sb->s_id, inode->i_ino);
1173 exp = exp_parent(clp, &path);
1174 if (IS_ERR(exp)) {
1175 err = PTR_ERR(exp);
1176 goto out;
1177 }
1178
1179 /*
1180 * fh must be initialized before calling fh_compose
1181 */
1182 fh_init(&fh, maxsize);
1183 if (fh_compose(&fh, exp, path.dentry, NULL))
1184 err = -EINVAL;
1185 else
1186 err = 0;
1187 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1188 fh_put(&fh);
1189 exp_put(exp);
1190 out:
1191 path_put(&path);
1192 return err;
1193 }
1194
1195 static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1196 u32 *fsidv, struct cache_req *reqp)
1197 {
1198 struct svc_export *exp;
1199 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1200 if (IS_ERR(ek))
1201 return ERR_CAST(ek);
1202
1203 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
1204 cache_put(&ek->h, &svc_expkey_cache);
1205
1206 if (IS_ERR(exp))
1207 return ERR_CAST(exp);
1208 return exp;
1209 }
1210
1211 __be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1212 {
1213 struct exp_flavor_info *f;
1214 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1215
1216 /* legacy gss-only clients are always OK: */
1217 if (exp->ex_client == rqstp->rq_gssclient)
1218 return 0;
1219 /* ip-address based client; check sec= export option: */
1220 for (f = exp->ex_flavors; f < end; f++) {
1221 if (f->pseudoflavor == rqstp->rq_flavor)
1222 return 0;
1223 }
1224 /* defaults in absence of sec= options: */
1225 if (exp->ex_nflavors == 0) {
1226 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1227 rqstp->rq_flavor == RPC_AUTH_UNIX)
1228 return 0;
1229 }
1230 return nfserr_wrongsec;
1231 }
1232
1233 /*
1234 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1235 * auth_unix client) if it's available and has secinfo information;
1236 * otherwise, will try to use rq_gssclient.
1237 *
1238 * Called from functions that handle requests; functions that do work on
1239 * behalf of mountd are passed a single client name to use, and should
1240 * use exp_get_by_name() or exp_find().
1241 */
1242 struct svc_export *
1243 rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
1244 {
1245 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1246
1247 if (rqstp->rq_client == NULL)
1248 goto gss;
1249
1250 /* First try the auth_unix client: */
1251 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
1252 if (PTR_ERR(exp) == -ENOENT)
1253 goto gss;
1254 if (IS_ERR(exp))
1255 return exp;
1256 /* If it has secinfo, assume there are no gss/... clients */
1257 if (exp->ex_nflavors > 0)
1258 return exp;
1259 gss:
1260 /* Otherwise, try falling back on gss client */
1261 if (rqstp->rq_gssclient == NULL)
1262 return exp;
1263 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
1264 if (PTR_ERR(gssexp) == -ENOENT)
1265 return exp;
1266 if (!IS_ERR(exp))
1267 exp_put(exp);
1268 return gssexp;
1269 }
1270
1271 struct svc_export *
1272 rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1273 {
1274 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
1275
1276 if (rqstp->rq_client == NULL)
1277 goto gss;
1278
1279 /* First try the auth_unix client: */
1280 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1281 if (PTR_ERR(exp) == -ENOENT)
1282 goto gss;
1283 if (IS_ERR(exp))
1284 return exp;
1285 /* If it has secinfo, assume there are no gss/... clients */
1286 if (exp->ex_nflavors > 0)
1287 return exp;
1288 gss:
1289 /* Otherwise, try falling back on gss client */
1290 if (rqstp->rq_gssclient == NULL)
1291 return exp;
1292 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1293 &rqstp->rq_chandle);
1294 if (PTR_ERR(gssexp) == -ENOENT)
1295 return exp;
1296 if (!IS_ERR(exp))
1297 exp_put(exp);
1298 return gssexp;
1299 }
1300
1301 struct svc_export *
1302 rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
1303 {
1304 struct dentry *saved = dget(path->dentry);
1305 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
1306
1307 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1308 struct dentry *parent = dget_parent(path->dentry);
1309 dput(path->dentry);
1310 path->dentry = parent;
1311 exp = rqst_exp_get_by_name(rqstp, path);
1312 }
1313 dput(path->dentry);
1314 path->dentry = saved;
1315 return exp;
1316 }
1317
1318 static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1319 {
1320 u32 fsidv[2];
1321
1322 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1323
1324 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
1325 }
1326
1327 /*
1328 * Called when we need the filehandle for the root of the pseudofs,
1329 * for a given NFSv4 client. The root is defined to be the
1330 * export point with fsid==0
1331 */
1332 __be32
1333 exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
1334 {
1335 struct svc_export *exp;
1336 __be32 rv;
1337
1338 exp = find_fsidzero_export(rqstp);
1339 if (IS_ERR(exp))
1340 return nfserrno(PTR_ERR(exp));
1341 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
1342 if (rv)
1343 goto out;
1344 rv = check_nfsd_access(exp, rqstp);
1345 if (rv)
1346 fh_put(fhp);
1347 out:
1348 exp_put(exp);
1349 return rv;
1350 }
1351
1352 /* Iterator */
1353
1354 static void *e_start(struct seq_file *m, loff_t *pos)
1355 __acquires(svc_export_cache.hash_lock)
1356 {
1357 loff_t n = *pos;
1358 unsigned hash, export;
1359 struct cache_head *ch;
1360
1361 exp_readlock();
1362 read_lock(&svc_export_cache.hash_lock);
1363 if (!n--)
1364 return SEQ_START_TOKEN;
1365 hash = n >> 32;
1366 export = n & ((1LL<<32) - 1);
1367
1368
1369 for (ch=export_table[hash]; ch; ch=ch->next)
1370 if (!export--)
1371 return ch;
1372 n &= ~((1LL<<32) - 1);
1373 do {
1374 hash++;
1375 n += 1LL<<32;
1376 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1377 if (hash >= EXPORT_HASHMAX)
1378 return NULL;
1379 *pos = n+1;
1380 return export_table[hash];
1381 }
1382
1383 static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1384 {
1385 struct cache_head *ch = p;
1386 int hash = (*pos >> 32);
1387
1388 if (p == SEQ_START_TOKEN)
1389 hash = 0;
1390 else if (ch->next == NULL) {
1391 hash++;
1392 *pos += 1LL<<32;
1393 } else {
1394 ++*pos;
1395 return ch->next;
1396 }
1397 *pos &= ~((1LL<<32) - 1);
1398 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1399 hash++;
1400 *pos += 1LL<<32;
1401 }
1402 if (hash >= EXPORT_HASHMAX)
1403 return NULL;
1404 ++*pos;
1405 return export_table[hash];
1406 }
1407
1408 static void e_stop(struct seq_file *m, void *p)
1409 __releases(svc_export_cache.hash_lock)
1410 {
1411 read_unlock(&svc_export_cache.hash_lock);
1412 exp_readunlock();
1413 }
1414
1415 static struct flags {
1416 int flag;
1417 char *name[2];
1418 } expflags[] = {
1419 { NFSEXP_READONLY, {"ro", "rw"}},
1420 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1421 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1422 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1423 { NFSEXP_ASYNC, {"async", "sync"}},
1424 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1425 { NFSEXP_NOHIDE, {"nohide", ""}},
1426 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1427 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1428 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1429 { NFSEXP_V4ROOT, {"v4root", ""}},
1430 #ifdef MSNFS
1431 { NFSEXP_MSNFS, {"msnfs", ""}},
1432 #endif
1433 { 0, {"", ""}}
1434 };
1435
1436 static void show_expflags(struct seq_file *m, int flags, int mask)
1437 {
1438 struct flags *flg;
1439 int state, first = 0;
1440
1441 for (flg = expflags; flg->flag; flg++) {
1442 if (flg->flag & ~mask)
1443 continue;
1444 state = (flg->flag & flags) ? 0 : 1;
1445 if (*flg->name[state])
1446 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1447 }
1448 }
1449
1450 static void show_secinfo_flags(struct seq_file *m, int flags)
1451 {
1452 seq_printf(m, ",");
1453 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1454 }
1455
1456 static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1457 {
1458 struct exp_flavor_info *f;
1459 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1460 int lastflags = 0, first = 0;
1461
1462 if (exp->ex_nflavors == 0)
1463 return;
1464 for (f = exp->ex_flavors; f < end; f++) {
1465 if (first || f->flags != lastflags) {
1466 if (!first)
1467 show_secinfo_flags(m, lastflags);
1468 seq_printf(m, ",sec=%d", f->pseudoflavor);
1469 lastflags = f->flags;
1470 } else {
1471 seq_printf(m, ":%d", f->pseudoflavor);
1472 }
1473 }
1474 show_secinfo_flags(m, lastflags);
1475 }
1476
1477 static void exp_flags(struct seq_file *m, int flag, int fsid,
1478 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1479 {
1480 show_expflags(m, flag, NFSEXP_ALLFLAGS);
1481 if (flag & NFSEXP_FSID)
1482 seq_printf(m, ",fsid=%d", fsid);
1483 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1484 seq_printf(m, ",anonuid=%u", anonu);
1485 if (anong != (gid_t)-2 && anong != (0x10000-2))
1486 seq_printf(m, ",anongid=%u", anong);
1487 if (fsloc && fsloc->locations_count > 0) {
1488 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1489 int i;
1490
1491 seq_printf(m, ",%s=", loctype);
1492 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1493 seq_putc(m, '@');
1494 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1495 for (i = 1; i < fsloc->locations_count; i++) {
1496 seq_putc(m, ';');
1497 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1498 seq_putc(m, '@');
1499 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1500 }
1501 }
1502 }
1503
1504 static int e_show(struct seq_file *m, void *p)
1505 {
1506 struct cache_head *cp = p;
1507 struct svc_export *exp = container_of(cp, struct svc_export, h);
1508
1509 if (p == SEQ_START_TOKEN) {
1510 seq_puts(m, "# Version 1.1\n");
1511 seq_puts(m, "# Path Client(Flags) # IPs\n");
1512 return 0;
1513 }
1514
1515 cache_get(&exp->h);
1516 if (cache_check(&svc_export_cache, &exp->h, NULL))
1517 return 0;
1518 cache_put(&exp->h, &svc_export_cache);
1519 return svc_export_show(m, &svc_export_cache, cp);
1520 }
1521
1522 const struct seq_operations nfs_exports_op = {
1523 .start = e_start,
1524 .next = e_next,
1525 .stop = e_stop,
1526 .show = e_show,
1527 };
1528
1529 /*
1530 * Add or modify a client.
1531 * Change requests may involve the list of host addresses. The list of
1532 * exports and possibly existing uid maps are left untouched.
1533 */
1534 int
1535 exp_addclient(struct nfsctl_client *ncp)
1536 {
1537 struct auth_domain *dom;
1538 int i, err;
1539 struct in6_addr addr6;
1540
1541 /* First, consistency check. */
1542 err = -EINVAL;
1543 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1544 goto out;
1545 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1546 goto out;
1547
1548 /* Lock the hashtable */
1549 exp_writelock();
1550
1551 dom = unix_domain_find(ncp->cl_ident);
1552
1553 err = -ENOMEM;
1554 if (!dom)
1555 goto out_unlock;
1556
1557 /* Insert client into hashtable. */
1558 for (i = 0; i < ncp->cl_naddr; i++) {
1559 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1560 auth_unix_add_addr(&addr6, dom);
1561 }
1562 auth_unix_forget_old(dom);
1563 auth_domain_put(dom);
1564
1565 err = 0;
1566
1567 out_unlock:
1568 exp_writeunlock();
1569 out:
1570 return err;
1571 }
1572
1573 /*
1574 * Delete a client given an identifier.
1575 */
1576 int
1577 exp_delclient(struct nfsctl_client *ncp)
1578 {
1579 int err;
1580 struct auth_domain *dom;
1581
1582 err = -EINVAL;
1583 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1584 goto out;
1585
1586 /* Lock the hashtable */
1587 exp_writelock();
1588
1589 dom = auth_domain_find(ncp->cl_ident);
1590 /* just make sure that no addresses work
1591 * and that it will expire soon
1592 */
1593 if (dom) {
1594 err = auth_unix_forget_old(dom);
1595 auth_domain_put(dom);
1596 }
1597
1598 exp_writeunlock();
1599 out:
1600 return err;
1601 }
1602
1603 /*
1604 * Verify that string is non-empty and does not exceed max length.
1605 */
1606 static int
1607 exp_verify_string(char *cp, int max)
1608 {
1609 int i;
1610
1611 for (i = 0; i < max; i++)
1612 if (!cp[i])
1613 return i;
1614 cp[i] = 0;
1615 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1616 return 0;
1617 }
1618
1619 /*
1620 * Initialize the exports module.
1621 */
1622 int
1623 nfsd_export_init(void)
1624 {
1625 int rv;
1626 dprintk("nfsd: initializing export module.\n");
1627
1628 rv = cache_register(&svc_export_cache);
1629 if (rv)
1630 return rv;
1631 rv = cache_register(&svc_expkey_cache);
1632 if (rv)
1633 cache_unregister(&svc_export_cache);
1634 return rv;
1635
1636 }
1637
1638 /*
1639 * Flush exports table - called when last nfsd thread is killed
1640 */
1641 void
1642 nfsd_export_flush(void)
1643 {
1644 exp_writelock();
1645 cache_purge(&svc_expkey_cache);
1646 cache_purge(&svc_export_cache);
1647 exp_writeunlock();
1648 }
1649
1650 /*
1651 * Shutdown the exports module.
1652 */
1653 void
1654 nfsd_export_shutdown(void)
1655 {
1656
1657 dprintk("nfsd: shutting down export module.\n");
1658
1659 exp_writelock();
1660
1661 cache_unregister(&svc_expkey_cache);
1662 cache_unregister(&svc_export_cache);
1663 svcauth_unix_purge();
1664
1665 exp_writeunlock();
1666 dprintk("nfsd: export shutdown complete.\n");
1667 }
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree