blob: c518421a9355fd93e4816f4056db7ebc08e25e1f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#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>
Bruce Allanf35279d2005-09-06 15:17:08 -070028#include <linux/module.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070029#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#include <linux/sunrpc/svc.h>
32#include <linux/nfsd/nfsd.h>
33#include <linux/nfsd/nfsfh.h>
34#include <linux/nfsd/syscall.h>
35#include <linux/lockd/bind.h>
36
37#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39typedef struct auth_domain svc_client;
40typedef struct svc_export svc_export;
41
42static void exp_do_unexport(svc_export *unexp);
43static int exp_verify_string(char *cp, int max);
44
45/*
46 * We have two caches.
47 * One maps client+vfsmnt+dentry to export options - the export map
48 * The other maps client+filehandle-fragment to export options. - the expkey map
49 *
50 * The export options are actually stored in the first map, and the
51 * second map contains a reference to the entry in the first map.
52 */
53
54#define EXPKEY_HASHBITS 8
55#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
56#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
57static struct cache_head *expkey_table[EXPKEY_HASHMAX];
58
Adrian Bunk74cae612006-03-27 01:15:10 -080059static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070060{
NeilBrownbaab9352006-03-27 01:15:09 -080061 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
62
63 if (test_bit(CACHE_VALID, &key->h.flags) &&
64 !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
65 dput(key->ek_dentry);
66 mntput(key->ek_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 }
NeilBrownbaab9352006-03-27 01:15:09 -080068 auth_domain_put(key->ek_client);
69 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070}
71
72static void expkey_request(struct cache_detail *cd,
73 struct cache_head *h,
74 char **bpp, int *blen)
75{
76 /* client fsidtype \xfsid */
77 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
78 char type[5];
79
80 qword_add(bpp, blen, ek->ek_client->name);
81 snprintf(type, 5, "%d", ek->ek_fsidtype);
82 qword_add(bpp, blen, type);
83 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
84 (*bpp)[-1] = '\n';
85}
86
NeilBrown8d270f72006-03-27 01:15:04 -080087static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
88static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080089static struct cache_detail svc_expkey_cache;
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
92{
93 /* client fsidtype fsid [path] */
94 char *buf;
95 int len;
96 struct auth_domain *dom = NULL;
97 int err;
98 int fsidtype;
99 char *ep;
100 struct svc_expkey key;
NeilBrown8d270f72006-03-27 01:15:04 -0800101 struct svc_expkey *ek;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102
103 if (mesg[mlen-1] != '\n')
104 return -EINVAL;
105 mesg[mlen-1] = 0;
106
107 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
108 err = -ENOMEM;
109 if (!buf) goto out;
110
111 err = -EINVAL;
112 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
113 goto out;
114
115 err = -ENOENT;
116 dom = auth_domain_find(buf);
117 if (!dom)
118 goto out;
119 dprintk("found domain %s\n", buf);
120
121 err = -EINVAL;
122 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
123 goto out;
124 fsidtype = simple_strtoul(buf, &ep, 10);
125 if (*ep)
126 goto out;
127 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700128 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 goto out;
130 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
131 goto out;
132 dprintk("found fsid length %d\n", len);
133 if (len != key_len(fsidtype))
134 goto out;
135
136 /* OK, we seem to have a valid key */
137 key.h.flags = 0;
138 key.h.expiry_time = get_expiry(&mesg);
139 if (key.h.expiry_time == 0)
140 goto out;
141
142 key.ek_client = dom;
143 key.ek_fsidtype = fsidtype;
144 memcpy(key.ek_fsid, buf, len);
145
NeilBrown8d270f72006-03-27 01:15:04 -0800146 ek = svc_expkey_lookup(&key);
147 err = -ENOMEM;
148 if (!ek)
149 goto out;
150
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f72006-03-27 01:15:04 -0800152 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
154 goto out;
155 dprintk("Path seems to be <%s>\n", buf);
156 err = 0;
157 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f72006-03-27 01:15:04 -0800159 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800161 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f72006-03-27 01:15:04 -0800162 else err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 } else {
164 struct nameidata nd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 err = path_lookup(buf, 0, &nd);
166 if (err)
167 goto out;
168
169 dprintk("Found the path %s\n", buf);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800170 key.ek_mnt = nd.mnt;
171 key.ek_dentry = nd.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
NeilBrown8d270f72006-03-27 01:15:04 -0800173 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800175 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f72006-03-27 01:15:04 -0800176 else
177 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 path_release(&nd);
179 }
180 cache_flush();
181 out:
182 if (dom)
183 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800184 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 return err;
186}
187
188static int expkey_show(struct seq_file *m,
189 struct cache_detail *cd,
190 struct cache_head *h)
191{
192 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800193 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
195 if (h ==NULL) {
196 seq_puts(m, "#domain fsidtype fsid [path]\n");
197 return 0;
198 }
199 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800200 seq_printf(m, "%s %d 0x", ek->ek_client->name,
201 ek->ek_fsidtype);
202 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
203 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 if (test_bit(CACHE_VALID, &h->flags) &&
205 !test_bit(CACHE_NEGATIVE, &h->flags)) {
206 seq_printf(m, " ");
NeilBrowneab7e2e2006-03-27 01:15:00 -0800207 seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 }
209 seq_printf(m, "\n");
210 return 0;
211}
NeilBrown8d270f72006-03-27 01:15:04 -0800212
213static inline int expkey_match (struct cache_head *a, struct cache_head *b)
214{
215 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
216 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
217
218 if (orig->ek_fsidtype != new->ek_fsidtype ||
219 orig->ek_client != new->ek_client ||
220 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
221 return 0;
222 return 1;
223}
224
225static inline void expkey_init(struct cache_head *cnew,
226 struct cache_head *citem)
227{
228 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
229 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
230
231 kref_get(&item->ek_client->ref);
232 new->ek_client = item->ek_client;
233 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800234
235 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f72006-03-27 01:15:04 -0800236}
237
238static inline void expkey_update(struct cache_head *cnew,
239 struct cache_head *citem)
240{
241 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
242 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
243
244 new->ek_mnt = mntget(item->ek_mnt);
245 new->ek_dentry = dget(item->ek_dentry);
246}
247
248static struct cache_head *expkey_alloc(void)
249{
250 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
251 if (i)
252 return &i->h;
253 else
254 return NULL;
255}
256
Adrian Bunk74cae612006-03-27 01:15:10 -0800257static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700258 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 .hash_size = EXPKEY_HASHMAX,
260 .hash_table = expkey_table,
261 .name = "nfsd.fh",
262 .cache_put = expkey_put,
263 .cache_request = expkey_request,
264 .cache_parse = expkey_parse,
265 .cache_show = expkey_show,
NeilBrown8d270f72006-03-27 01:15:04 -0800266 .match = expkey_match,
267 .init = expkey_init,
268 .update = expkey_update,
269 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270};
271
NeilBrown8d270f72006-03-27 01:15:04 -0800272static struct svc_expkey *
273svc_expkey_lookup(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
NeilBrown8d270f72006-03-27 01:15:04 -0800275 struct cache_head *ch;
276 int hash = item->ek_fsidtype;
277 char * cp = (char*)item->ek_fsid;
278 int len = key_len(item->ek_fsidtype);
279
280 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
281 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
282 hash &= EXPKEY_HASHMASK;
283
284 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
285 hash);
286 if (ch)
287 return container_of(ch, struct svc_expkey, h);
288 else
289 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
NeilBrown8d270f72006-03-27 01:15:04 -0800292static struct svc_expkey *
293svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294{
NeilBrown8d270f72006-03-27 01:15:04 -0800295 struct cache_head *ch;
296 int hash = new->ek_fsidtype;
297 char * cp = (char*)new->ek_fsid;
298 int len = key_len(new->ek_fsidtype);
299
300 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
301 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
302 hash &= EXPKEY_HASHMASK;
303
304 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
305 &old->h, hash);
306 if (ch)
307 return container_of(ch, struct svc_expkey, h);
308 else
309 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
313#define EXPORT_HASHBITS 8
314#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
315#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
316
317static struct cache_head *export_table[EXPORT_HASHMAX];
318
Manoj Naik933469192006-10-04 02:16:18 -0700319static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
320{
321 int i;
322
323 for (i = 0; i < fsloc->locations_count; i++) {
324 kfree(fsloc->locations[i].path);
325 kfree(fsloc->locations[i].hosts);
326 }
327 kfree(fsloc->locations);
328}
329
NeilBrownbaab9352006-03-27 01:15:09 -0800330static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
NeilBrownbaab9352006-03-27 01:15:09 -0800332 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
333 dput(exp->ex_dentry);
334 mntput(exp->ex_mnt);
335 auth_domain_put(exp->ex_client);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700336 kfree(exp->ex_path);
Manoj Naik933469192006-10-04 02:16:18 -0700337 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800338 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339}
340
341static void svc_export_request(struct cache_detail *cd,
342 struct cache_head *h,
343 char **bpp, int *blen)
344{
345 /* client path */
346 struct svc_export *exp = container_of(h, struct svc_export, h);
347 char *pth;
348
349 qword_add(bpp, blen, exp->ex_client->name);
350 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
351 if (IS_ERR(pth)) {
352 /* is this correct? */
353 (*bpp)[0] = '\n';
354 return;
355 }
356 qword_add(bpp, blen, pth);
357 (*bpp)[-1] = '\n';
358}
359
Adrian Bunk74cae612006-03-27 01:15:10 -0800360static struct svc_export *svc_export_update(struct svc_export *new,
361 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800362static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
NeilBrownaf6a4e22007-02-14 00:33:12 -0800364static int check_export(struct inode *inode, int flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365{
366
367 /* We currently export only dirs and regular files.
368 * This is what umountd does.
369 */
370 if (!S_ISDIR(inode->i_mode) &&
371 !S_ISREG(inode->i_mode))
372 return -ENOTDIR;
373
374 /* There are two requirements on a filesystem to be exportable.
375 * 1: We must be able to identify the filesystem from a number.
376 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800377 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 * 2: We must be able to find an inode from a filehandle.
379 * This means that s_export_op must be set.
380 */
381 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800382 !(flags & NFSEXP_FSID) &&
383 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700384 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return -EINVAL;
386 }
387 if (!inode->i_sb->s_export_op) {
388 dprintk("exp_export: export of invalid fs type.\n");
389 return -EINVAL;
390 }
391
392 /* Ok, we can export it */;
393 if (!inode->i_sb->s_export_op->find_exported_dentry)
394 inode->i_sb->s_export_op->find_exported_dentry =
395 find_exported_dentry;
396 return 0;
397
398}
399
Manoj Naik933469192006-10-04 02:16:18 -0700400#ifdef CONFIG_NFSD_V4
401
402static int
403fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
404{
405 int len;
406 int migrated, i, err;
407
Manoj Naik933469192006-10-04 02:16:18 -0700408 /* 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;
450out_free_all:
451 nfsd4_fslocs_free(fsloc);
452 return err;
453}
454
455#else /* CONFIG_NFSD_V4 */
456static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; }
457#endif
458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
460{
461 /* client path expiry [flags anonuid anongid fsid] */
462 char *buf;
463 int len;
464 int err;
465 struct auth_domain *dom = NULL;
466 struct nameidata nd;
467 struct svc_export exp, *expp;
468 int an_int;
469
470 nd.dentry = NULL;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700471 exp.ex_path = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472
NeilBrown402acd22007-05-09 02:34:52 -0700473 /* fs locations */
474 exp.ex_fslocs.locations = NULL;
475 exp.ex_fslocs.locations_count = 0;
476 exp.ex_fslocs.migrated = 0;
477
478 exp.ex_uuid = NULL;
479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 if (mesg[mlen-1] != '\n')
481 return -EINVAL;
482 mesg[mlen-1] = 0;
483
484 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
485 err = -ENOMEM;
486 if (!buf) goto out;
487
488 /* client */
489 len = qword_get(&mesg, buf, PAGE_SIZE);
490 err = -EINVAL;
491 if (len <= 0) goto out;
492
493 err = -ENOENT;
494 dom = auth_domain_find(buf);
495 if (!dom)
496 goto out;
497
498 /* path */
499 err = -EINVAL;
500 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
501 goto out;
502 err = path_lookup(buf, 0, &nd);
NeilBrowncd156542006-04-10 22:55:27 -0700503 if (err) goto out_no_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 exp.h.flags = 0;
506 exp.ex_client = dom;
507 exp.ex_mnt = nd.mnt;
508 exp.ex_dentry = nd.dentry;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700509 exp.ex_path = kstrdup(buf, GFP_KERNEL);
510 err = -ENOMEM;
511 if (!exp.ex_path)
512 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
514 /* expiry */
515 err = -EINVAL;
516 exp.h.expiry_time = get_expiry(&mesg);
517 if (exp.h.expiry_time == 0)
518 goto out;
519
520 /* flags */
521 err = get_int(&mesg, &an_int);
522 if (err == -ENOENT)
523 set_bit(CACHE_NEGATIVE, &exp.h.flags);
524 else {
525 if (err || an_int < 0) goto out;
526 exp.ex_flags= an_int;
527
528 /* anon uid */
529 err = get_int(&mesg, &an_int);
530 if (err) goto out;
531 exp.ex_anon_uid= an_int;
532
533 /* anon gid */
534 err = get_int(&mesg, &an_int);
535 if (err) goto out;
536 exp.ex_anon_gid= an_int;
537
538 /* fsid */
539 err = get_int(&mesg, &an_int);
540 if (err) goto out;
541 exp.ex_fsid = an_int;
542
NeilBrownaf6a4e22007-02-14 00:33:12 -0800543 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
544 if (strcmp(buf, "fsloc") == 0)
545 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
546 else if (strcmp(buf, "uuid") == 0) {
547 /* expect a 16 byte uuid encoded as \xXXXX... */
548 len = qword_get(&mesg, buf, PAGE_SIZE);
549 if (len != 16)
550 err = -EINVAL;
551 else {
552 exp.ex_uuid =
553 kmemdup(buf, 16, GFP_KERNEL);
554 if (exp.ex_uuid == NULL)
555 err = -ENOMEM;
556 }
557 } else
558 /* quietly ignore unknown words and anything
559 * following. Newer user-space can try to set
560 * new values, then see what the result was.
561 */
562 break;
563 if (err)
564 goto out;
565 }
Manoj Naik933469192006-10-04 02:16:18 -0700566
NeilBrownaf6a4e22007-02-14 00:33:12 -0800567 err = check_export(nd.dentry->d_inode, exp.ex_flags,
568 exp.ex_uuid);
569 if (err) goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 }
571
NeilBrown4f7774c2006-03-27 01:15:03 -0800572 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800574 expp = svc_export_update(&exp, expp);
575 else
576 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800578 if (expp == NULL)
579 err = -ENOMEM;
580 else
581 exp_put(expp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 out:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800583 nfsd4_fslocs_free(&exp.ex_fslocs);
584 kfree(exp.ex_uuid);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700585 kfree(exp.ex_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 if (nd.dentry)
587 path_release(&nd);
NeilBrowncd156542006-04-10 22:55:27 -0700588 out_no_path:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 if (dom)
590 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800591 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 return err;
593}
594
Manoj Naik933469192006-10-04 02:16:18 -0700595static void exp_flags(struct seq_file *m, int flag, int fsid,
596 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597
598static int svc_export_show(struct seq_file *m,
599 struct cache_detail *cd,
600 struct cache_head *h)
601{
602 struct svc_export *exp ;
603
604 if (h ==NULL) {
605 seq_puts(m, "#path domain(flags)\n");
606 return 0;
607 }
608 exp = container_of(h, struct svc_export, h);
609 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
610 seq_putc(m, '\t');
611 seq_escape(m, exp->ex_client->name, " \t\n\\");
612 seq_putc(m, '(');
613 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800614 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700615 exp_flags(m, exp->ex_flags, exp->ex_fsid,
616 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800617 if (exp->ex_uuid) {
618 int i;
619 seq_puts(m, ",uuid=");
620 for (i=0; i<16; i++) {
621 if ((i&3) == 0 && i)
622 seq_putc(m, ':');
623 seq_printf(m, "%02x", exp->ex_uuid[i]);
624 }
625 }
626 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 seq_puts(m, ")\n");
628 return 0;
629}
NeilBrown4f7774c2006-03-27 01:15:03 -0800630static int svc_export_match(struct cache_head *a, struct cache_head *b)
631{
632 struct svc_export *orig = container_of(a, struct svc_export, h);
633 struct svc_export *new = container_of(b, struct svc_export, h);
634 return orig->ex_client == new->ex_client &&
635 orig->ex_dentry == new->ex_dentry &&
636 orig->ex_mnt == new->ex_mnt;
637}
638
639static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
640{
641 struct svc_export *new = container_of(cnew, struct svc_export, h);
642 struct svc_export *item = container_of(citem, struct svc_export, h);
643
644 kref_get(&item->ex_client->ref);
645 new->ex_client = item->ex_client;
646 new->ex_dentry = dget(item->ex_dentry);
647 new->ex_mnt = mntget(item->ex_mnt);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700648 new->ex_path = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700649 new->ex_fslocs.locations = NULL;
650 new->ex_fslocs.locations_count = 0;
651 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800652}
653
654static void export_update(struct cache_head *cnew, struct cache_head *citem)
655{
656 struct svc_export *new = container_of(cnew, struct svc_export, h);
657 struct svc_export *item = container_of(citem, struct svc_export, h);
658
659 new->ex_flags = item->ex_flags;
660 new->ex_anon_uid = item->ex_anon_uid;
661 new->ex_anon_gid = item->ex_anon_gid;
662 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800663 new->ex_uuid = item->ex_uuid;
664 item->ex_uuid = NULL;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700665 new->ex_path = item->ex_path;
666 item->ex_path = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700667 new->ex_fslocs.locations = item->ex_fslocs.locations;
668 item->ex_fslocs.locations = NULL;
669 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
670 item->ex_fslocs.locations_count = 0;
671 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
672 item->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800673}
674
675static struct cache_head *svc_export_alloc(void)
676{
677 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
678 if (i)
679 return &i->h;
680 else
681 return NULL;
682}
683
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700685 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 .hash_size = EXPORT_HASHMAX,
687 .hash_table = export_table,
688 .name = "nfsd.export",
689 .cache_put = svc_export_put,
690 .cache_request = svc_export_request,
691 .cache_parse = svc_export_parse,
692 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800693 .match = svc_export_match,
694 .init = svc_export_init,
695 .update = export_update,
696 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697};
698
NeilBrown4f7774c2006-03-27 01:15:03 -0800699static struct svc_export *
700svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701{
NeilBrown4f7774c2006-03-27 01:15:03 -0800702 struct cache_head *ch;
703 int hash;
704 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
705 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
706 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
707
708 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
709 hash);
710 if (ch)
711 return container_of(ch, struct svc_export, h);
712 else
713 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714}
715
Adrian Bunk74cae612006-03-27 01:15:10 -0800716static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800717svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718{
NeilBrown4f7774c2006-03-27 01:15:03 -0800719 struct cache_head *ch;
720 int hash;
721 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
722 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
723 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
NeilBrown4f7774c2006-03-27 01:15:03 -0800725 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
726 &old->h,
727 hash);
728 if (ch)
729 return container_of(ch, struct svc_export, h);
730 else
731 return NULL;
732}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
734
Adrian Bunk74cae612006-03-27 01:15:10 -0800735static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
737{
738 struct svc_expkey key, *ek;
739 int err;
740
741 if (!clp)
742 return NULL;
743
744 key.ek_client = clp;
745 key.ek_fsidtype = fsid_type;
746 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
747
NeilBrown8d270f72006-03-27 01:15:04 -0800748 ek = svc_expkey_lookup(&key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 if (ek != NULL)
750 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
751 ek = ERR_PTR(err);
752 return ek;
753}
754
755static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
756 struct svc_export *exp)
757{
758 struct svc_expkey key, *ek;
759
760 key.ek_client = clp;
761 key.ek_fsidtype = fsid_type;
762 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
NeilBrowneab7e2e2006-03-27 01:15:00 -0800763 key.ek_mnt = exp->ex_mnt;
764 key.ek_dentry = exp->ex_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 key.h.expiry_time = NEVER;
766 key.h.flags = 0;
767
NeilBrown8d270f72006-03-27 01:15:04 -0800768 ek = svc_expkey_lookup(&key);
769 if (ek)
770 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800772 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 return 0;
774 }
775 return -ENOMEM;
776}
777
778/*
779 * Find the client's export entry matching xdev/xino.
780 */
781static inline struct svc_expkey *
782exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
783{
784 u32 fsidv[3];
785
786 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800787 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
788 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700789 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800790 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
791 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792}
793
794/*
795 * Find the client's export entry matching fsid
796 */
797static inline struct svc_expkey *
798exp_get_fsid_key(svc_client *clp, int fsid)
799{
800 u32 fsidv[2];
801
NeilBrownaf6a4e22007-02-14 00:33:12 -0800802 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803
NeilBrownaf6a4e22007-02-14 00:33:12 -0800804 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805}
806
807svc_export *
808exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
809 struct cache_req *reqp)
810{
811 struct svc_export *exp, key;
812
813 if (!clp)
814 return NULL;
815
816 key.ex_client = clp;
817 key.ex_mnt = mnt;
818 key.ex_dentry = dentry;
819
NeilBrown4f7774c2006-03-27 01:15:03 -0800820 exp = svc_export_lookup(&key);
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800821 if (exp != NULL) {
822 int err;
823
824 err = cache_check(&svc_export_cache, &exp->h, reqp);
825 switch (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 case 0: break;
827 case -EAGAIN:
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800828 case -ETIMEDOUT:
829 exp = ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 break;
831 default:
832 exp = NULL;
833 }
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800834 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835
836 return exp;
837}
838
839/*
840 * Find the export entry for a given dentry.
841 */
842struct svc_export *
843exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
844 struct cache_req *reqp)
845{
846 svc_export *exp;
847
848 dget(dentry);
849 exp = exp_get_by_name(clp, mnt, dentry, reqp);
850
851 while (exp == NULL && !IS_ROOT(dentry)) {
852 struct dentry *parent;
853
854 parent = dget_parent(dentry);
855 dput(dentry);
856 dentry = parent;
857 exp = exp_get_by_name(clp, mnt, dentry, reqp);
858 }
859 dput(dentry);
860 return exp;
861}
862
863/*
864 * Hashtable locking. Write locks are placed only by user processes
865 * wanting to modify export information.
866 * Write locking only done in this file. Read locking
867 * needed externally.
868 */
869
870static DECLARE_RWSEM(hash_sem);
871
872void
873exp_readlock(void)
874{
875 down_read(&hash_sem);
876}
877
878static inline void
879exp_writelock(void)
880{
881 down_write(&hash_sem);
882}
883
884void
885exp_readunlock(void)
886{
887 up_read(&hash_sem);
888}
889
890static inline void
891exp_writeunlock(void)
892{
893 up_write(&hash_sem);
894}
895
896static void exp_fsid_unhash(struct svc_export *exp)
897{
898 struct svc_expkey *ek;
899
900 if ((exp->ex_flags & NFSEXP_FSID) == 0)
901 return;
902
903 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
904 if (ek && !IS_ERR(ek)) {
905 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800906 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 }
908 svc_expkey_cache.nextcheck = get_seconds();
909}
910
911static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
912{
913 u32 fsid[2];
914
915 if ((exp->ex_flags & NFSEXP_FSID) == 0)
916 return 0;
917
NeilBrownaf6a4e22007-02-14 00:33:12 -0800918 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
919 return exp_set_key(clp, FSID_NUM, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700920}
921
922static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
923{
924 u32 fsid[2];
925 struct inode *inode = exp->ex_dentry->d_inode;
926 dev_t dev = inode->i_sb->s_dev;
927
928 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800929 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
930 return exp_set_key(clp, FSID_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800932 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
933 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700934}
935
936static void exp_unhash(struct svc_export *exp)
937{
938 struct svc_expkey *ek;
939 struct inode *inode = exp->ex_dentry->d_inode;
940
941 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
942 if (ek && !IS_ERR(ek)) {
943 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800944 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945 }
946 svc_expkey_cache.nextcheck = get_seconds();
947}
948
949/*
950 * Export a file system.
951 */
952int
953exp_export(struct nfsctl_export *nxp)
954{
955 svc_client *clp;
956 struct svc_export *exp = NULL;
957 struct svc_export new;
958 struct svc_expkey *fsid_key = NULL;
959 struct nameidata nd;
960 int err;
961
962 /* Consistency check */
963 err = -EINVAL;
964 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
965 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
966 goto out;
967
968 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
969 nxp->ex_client, nxp->ex_path,
970 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
971 nxp->ex_flags);
972
973 /* Try to lock the export table for update */
974 exp_writelock();
975
976 /* Look up client info */
977 if (!(clp = auth_domain_find(nxp->ex_client)))
978 goto out_unlock;
979
980
981 /* Look up the dentry */
982 err = path_lookup(nxp->ex_path, 0, &nd);
983 if (err)
984 goto out_unlock;
985 err = -EINVAL;
986
987 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
988
NeilBrownf9884432006-12-13 00:35:45 -0800989 memset(&new, 0, sizeof(new));
990
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 /* must make sure there won't be an ex_fsid clash */
992 if ((nxp->ex_flags & NFSEXP_FSID) &&
993 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
994 !IS_ERR(fsid_key) &&
NeilBrowneab7e2e2006-03-27 01:15:00 -0800995 fsid_key->ek_mnt &&
996 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 goto finish;
998
999 if (exp) {
1000 /* just a flags/id/fsid update */
1001
1002 exp_fsid_unhash(exp);
1003 exp->ex_flags = nxp->ex_flags;
1004 exp->ex_anon_uid = nxp->ex_anon_uid;
1005 exp->ex_anon_gid = nxp->ex_anon_gid;
1006 exp->ex_fsid = nxp->ex_dev;
1007
1008 err = exp_fsid_hash(clp, exp);
1009 goto finish;
1010 }
1011
NeilBrownaf6a4e22007-02-14 00:33:12 -08001012 err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001013 if (err) goto finish;
1014
1015 err = -ENOMEM;
1016
1017 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1018
1019 new.h.expiry_time = NEVER;
1020 new.h.flags = 0;
NeilBrownf9884432006-12-13 00:35:45 -08001021 new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL);
1022 if (!new.ex_path)
1023 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 new.ex_client = clp;
1025 new.ex_mnt = nd.mnt;
1026 new.ex_dentry = nd.dentry;
1027 new.ex_flags = nxp->ex_flags;
1028 new.ex_anon_uid = nxp->ex_anon_uid;
1029 new.ex_anon_gid = nxp->ex_anon_gid;
1030 new.ex_fsid = nxp->ex_dev;
1031
NeilBrown4f7774c2006-03-27 01:15:03 -08001032 exp = svc_export_lookup(&new);
1033 if (exp)
1034 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035
NeilBrown4f7774c2006-03-27 01:15:03 -08001036 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 goto finish;
1038
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 if (exp_hash(clp, exp) ||
1040 exp_fsid_hash(clp, exp)) {
1041 /* failed to create at least one index */
1042 exp_do_unexport(exp);
1043 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001044 } else
1045 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046finish:
NeilBrownf9884432006-12-13 00:35:45 -08001047 if (new.ex_path)
1048 kfree(new.ex_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 if (exp)
1050 exp_put(exp);
1051 if (fsid_key && !IS_ERR(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001052 cache_put(&fsid_key->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001053 if (clp)
1054 auth_domain_put(clp);
1055 path_release(&nd);
1056out_unlock:
1057 exp_writeunlock();
1058out:
1059 return err;
1060}
1061
1062/*
1063 * Unexport a file system. The export entry has already
1064 * been removed from the client's list of exported fs's.
1065 */
1066static void
1067exp_do_unexport(svc_export *unexp)
1068{
1069 unexp->h.expiry_time = get_seconds()-1;
1070 svc_export_cache.nextcheck = get_seconds();
1071 exp_unhash(unexp);
1072 exp_fsid_unhash(unexp);
1073}
1074
1075
1076/*
1077 * unexport syscall.
1078 */
1079int
1080exp_unexport(struct nfsctl_export *nxp)
1081{
1082 struct auth_domain *dom;
1083 svc_export *exp;
1084 struct nameidata nd;
1085 int err;
1086
1087 /* Consistency check */
1088 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1089 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1090 return -EINVAL;
1091
1092 exp_writelock();
1093
1094 err = -EINVAL;
1095 dom = auth_domain_find(nxp->ex_client);
1096 if (!dom) {
1097 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1098 goto out_unlock;
1099 }
1100
1101 err = path_lookup(nxp->ex_path, 0, &nd);
1102 if (err)
1103 goto out_domain;
1104
1105 err = -EINVAL;
1106 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
1107 path_release(&nd);
1108 if (!exp)
1109 goto out_domain;
1110
1111 exp_do_unexport(exp);
1112 exp_put(exp);
1113 err = 0;
1114
1115out_domain:
1116 auth_domain_put(dom);
1117 cache_flush();
1118out_unlock:
1119 exp_writeunlock();
1120 return err;
1121}
1122
1123/*
1124 * Obtain the root fh on behalf of a client.
1125 * This could be done in user space, but I feel that it adds some safety
1126 * since its harder to fool a kernel module than a user space program.
1127 */
1128int
1129exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1130{
1131 struct svc_export *exp;
1132 struct nameidata nd;
1133 struct inode *inode;
1134 struct svc_fh fh;
1135 int err;
1136
1137 err = -EPERM;
1138 /* NB: we probably ought to check that it's NUL-terminated */
1139 if (path_lookup(path, 0, &nd)) {
1140 printk("nfsd: exp_rootfh path not found %s", path);
1141 return err;
1142 }
1143 inode = nd.dentry->d_inode;
1144
1145 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1146 path, nd.dentry, clp->name,
1147 inode->i_sb->s_id, inode->i_ino);
1148 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001149 if (IS_ERR(exp)) {
1150 err = PTR_ERR(exp);
1151 goto out;
1152 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001153 if (!exp) {
1154 dprintk("nfsd: exp_rootfh export not found.\n");
1155 goto out;
1156 }
1157
1158 /*
1159 * fh must be initialized before calling fh_compose
1160 */
1161 fh_init(&fh, maxsize);
1162 if (fh_compose(&fh, exp, nd.dentry, NULL))
1163 err = -EINVAL;
1164 else
1165 err = 0;
1166 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1167 fh_put(&fh);
1168 exp_put(exp);
1169out:
1170 path_release(&nd);
1171 return err;
1172}
1173
NeilBrowneab7e2e2006-03-27 01:15:00 -08001174struct svc_export *
1175exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1176 struct cache_req *reqp)
1177{
1178 struct svc_export *exp;
1179 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1180 if (!ek || IS_ERR(ek))
1181 return ERR_PTR(PTR_ERR(ek));
1182
1183 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001184 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001185
1186 if (!exp || IS_ERR(exp))
1187 return ERR_PTR(PTR_ERR(exp));
1188 return exp;
1189}
1190
1191
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192/*
1193 * Called when we need the filehandle for the root of the pseudofs,
1194 * for a given NFSv4 client. The root is defined to be the
1195 * export point with fsid==0
1196 */
Al Viroc7afef12006-10-19 23:29:02 -07001197__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1199 struct cache_req *creq)
1200{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001201 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001202 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 u32 fsidv[2];
1204
NeilBrownaf6a4e22007-02-14 00:33:12 -08001205 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206
NeilBrownaf6a4e22007-02-14 00:33:12 -08001207 exp = exp_find(clp, FSID_NUM, fsidv, creq);
J.Bruce Fields68993202006-12-13 00:35:23 -08001208 if (IS_ERR(exp))
1209 return nfserrno(PTR_ERR(exp));
NeilBrowneab7e2e2006-03-27 01:15:00 -08001210 if (exp == NULL)
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001211 return nfserr_perm;
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001212 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1213 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001214 return rv;
1215}
1216
1217/* Iterator */
1218
1219static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001220 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221{
1222 loff_t n = *pos;
1223 unsigned hash, export;
1224 struct cache_head *ch;
1225
1226 exp_readlock();
1227 read_lock(&svc_export_cache.hash_lock);
1228 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001229 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001230 hash = n >> 32;
1231 export = n & ((1LL<<32) - 1);
1232
1233
1234 for (ch=export_table[hash]; ch; ch=ch->next)
1235 if (!export--)
1236 return ch;
1237 n &= ~((1LL<<32) - 1);
1238 do {
1239 hash++;
1240 n += 1LL<<32;
1241 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1242 if (hash >= EXPORT_HASHMAX)
1243 return NULL;
1244 *pos = n+1;
1245 return export_table[hash];
1246}
1247
1248static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1249{
1250 struct cache_head *ch = p;
1251 int hash = (*pos >> 32);
1252
Greg Banksbc6f02e2006-10-02 02:17:49 -07001253 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 hash = 0;
1255 else if (ch->next == NULL) {
1256 hash++;
1257 *pos += 1LL<<32;
1258 } else {
1259 ++*pos;
1260 return ch->next;
1261 }
1262 *pos &= ~((1LL<<32) - 1);
1263 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1264 hash++;
1265 *pos += 1LL<<32;
1266 }
1267 if (hash >= EXPORT_HASHMAX)
1268 return NULL;
1269 ++*pos;
1270 return export_table[hash];
1271}
1272
1273static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001274 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001275{
1276 read_unlock(&svc_export_cache.hash_lock);
1277 exp_readunlock();
1278}
1279
1280static struct flags {
1281 int flag;
1282 char *name[2];
1283} expflags[] = {
1284 { NFSEXP_READONLY, {"ro", "rw"}},
1285 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1286 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1287 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1288 { NFSEXP_ASYNC, {"async", "sync"}},
1289 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1290 { NFSEXP_NOHIDE, {"nohide", ""}},
1291 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1292 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1293 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1294#ifdef MSNFS
1295 { NFSEXP_MSNFS, {"msnfs", ""}},
1296#endif
1297 { 0, {"", ""}}
1298};
1299
Manoj Naik933469192006-10-04 02:16:18 -07001300static void exp_flags(struct seq_file *m, int flag, int fsid,
1301 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001302{
1303 int first = 0;
1304 struct flags *flg;
1305
1306 for (flg = expflags; flg->flag; flg++) {
1307 int state = (flg->flag & flag)?0:1;
1308 if (*flg->name[state])
1309 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1310 }
1311 if (flag & NFSEXP_FSID)
1312 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1313 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1314 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1315 if (anong != (gid_t)-2 && anong != (0x10000-2))
1316 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001317 if (fsloc && fsloc->locations_count > 0) {
1318 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1319 int i;
1320
1321 seq_printf(m, "%s%s=", first++?",":"", loctype);
1322 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1323 seq_putc(m, '@');
1324 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1325 for (i = 1; i < fsloc->locations_count; i++) {
1326 seq_putc(m, ';');
1327 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1328 seq_putc(m, '@');
1329 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1330 }
1331 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332}
1333
1334static int e_show(struct seq_file *m, void *p)
1335{
1336 struct cache_head *cp = p;
1337 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001338
Greg Banksbc6f02e2006-10-02 02:17:49 -07001339 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340 seq_puts(m, "# Version 1.1\n");
1341 seq_puts(m, "# Path Client(Flags) # IPs\n");
1342 return 0;
1343 }
1344
Linus Torvalds1da177e2005-04-16 15:20:36 -07001345 cache_get(&exp->h);
1346 if (cache_check(&svc_export_cache, &exp->h, NULL))
1347 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001348 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 return svc_export_show(m, &svc_export_cache, cp);
1350}
1351
1352struct seq_operations nfs_exports_op = {
1353 .start = e_start,
1354 .next = e_next,
1355 .stop = e_stop,
1356 .show = e_show,
1357};
1358
1359/*
1360 * Add or modify a client.
1361 * Change requests may involve the list of host addresses. The list of
1362 * exports and possibly existing uid maps are left untouched.
1363 */
1364int
1365exp_addclient(struct nfsctl_client *ncp)
1366{
1367 struct auth_domain *dom;
1368 int i, err;
1369
1370 /* First, consistency check. */
1371 err = -EINVAL;
1372 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1373 goto out;
1374 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1375 goto out;
1376
1377 /* Lock the hashtable */
1378 exp_writelock();
1379
1380 dom = unix_domain_find(ncp->cl_ident);
1381
1382 err = -ENOMEM;
1383 if (!dom)
1384 goto out_unlock;
1385
1386 /* Insert client into hashtable. */
1387 for (i = 0; i < ncp->cl_naddr; i++)
1388 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1389
1390 auth_unix_forget_old(dom);
1391 auth_domain_put(dom);
1392
1393 err = 0;
1394
1395out_unlock:
1396 exp_writeunlock();
1397out:
1398 return err;
1399}
1400
1401/*
1402 * Delete a client given an identifier.
1403 */
1404int
1405exp_delclient(struct nfsctl_client *ncp)
1406{
1407 int err;
1408 struct auth_domain *dom;
1409
1410 err = -EINVAL;
1411 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1412 goto out;
1413
1414 /* Lock the hashtable */
1415 exp_writelock();
1416
1417 dom = auth_domain_find(ncp->cl_ident);
1418 /* just make sure that no addresses work
1419 * and that it will expire soon
1420 */
1421 if (dom) {
1422 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423 auth_domain_put(dom);
1424 }
1425
1426 exp_writeunlock();
1427out:
1428 return err;
1429}
1430
1431/*
1432 * Verify that string is non-empty and does not exceed max length.
1433 */
1434static int
1435exp_verify_string(char *cp, int max)
1436{
1437 int i;
1438
1439 for (i = 0; i < max; i++)
1440 if (!cp[i])
1441 return i;
1442 cp[i] = 0;
1443 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1444 return 0;
1445}
1446
1447/*
1448 * Initialize the exports module.
1449 */
1450void
1451nfsd_export_init(void)
1452{
1453 dprintk("nfsd: initializing export module.\n");
1454
1455 cache_register(&svc_export_cache);
1456 cache_register(&svc_expkey_cache);
1457
1458}
1459
1460/*
1461 * Flush exports table - called when last nfsd thread is killed
1462 */
1463void
1464nfsd_export_flush(void)
1465{
1466 exp_writelock();
1467 cache_purge(&svc_expkey_cache);
1468 cache_purge(&svc_export_cache);
1469 exp_writeunlock();
1470}
1471
1472/*
1473 * Shutdown the exports module.
1474 */
1475void
1476nfsd_export_shutdown(void)
1477{
1478
1479 dprintk("nfsd: shutting down export module.\n");
1480
1481 exp_writelock();
1482
1483 if (cache_unregister(&svc_expkey_cache))
1484 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1485 if (cache_unregister(&svc_export_cache))
1486 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1487 svcauth_unix_purge();
1488
1489 exp_writeunlock();
1490 dprintk("nfsd: export shutdown complete.\n");
1491}