blob: 6ab8de40904ce97c4c41f8c7a5b1a671fe85ce19 [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>
Andy Adamsone677bfe2007-07-17 04:04:42 -070036#include <linux/sunrpc/msg_prot.h>
37#include <linux/sunrpc/gss_api.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070038
39#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
41typedef struct auth_domain svc_client;
42typedef struct svc_export svc_export;
43
44static void exp_do_unexport(svc_export *unexp);
45static int exp_verify_string(char *cp, int max);
46
47/*
48 * We have two caches.
49 * One maps client+vfsmnt+dentry to export options - the export map
50 * The other maps client+filehandle-fragment to export options. - the expkey map
51 *
52 * The export options are actually stored in the first map, and the
53 * second map contains a reference to the entry in the first map.
54 */
55
56#define EXPKEY_HASHBITS 8
57#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
58#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
59static struct cache_head *expkey_table[EXPKEY_HASHMAX];
60
Adrian Bunk74cae612006-03-27 01:15:10 -080061static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
NeilBrownbaab9352006-03-27 01:15:09 -080063 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
64
65 if (test_bit(CACHE_VALID, &key->h.flags) &&
66 !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
67 dput(key->ek_dentry);
68 mntput(key->ek_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 }
NeilBrownbaab9352006-03-27 01:15:09 -080070 auth_domain_put(key->ek_client);
71 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072}
73
74static void expkey_request(struct cache_detail *cd,
75 struct cache_head *h,
76 char **bpp, int *blen)
77{
78 /* client fsidtype \xfsid */
79 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
80 char type[5];
81
82 qword_add(bpp, blen, ek->ek_client->name);
83 snprintf(type, 5, "%d", ek->ek_fsidtype);
84 qword_add(bpp, blen, type);
85 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
86 (*bpp)[-1] = '\n';
87}
88
NeilBrown8d270f7f2006-03-27 01:15:04 -080089static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
90static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080091static struct cache_detail svc_expkey_cache;
92
Linus Torvalds1da177e2005-04-16 15:20:36 -070093static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
94{
95 /* client fsidtype fsid [path] */
96 char *buf;
97 int len;
98 struct auth_domain *dom = NULL;
99 int err;
100 int fsidtype;
101 char *ep;
102 struct svc_expkey key;
NeilBrown8d270f7f2006-03-27 01:15:04 -0800103 struct svc_expkey *ek;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104
105 if (mesg[mlen-1] != '\n')
106 return -EINVAL;
107 mesg[mlen-1] = 0;
108
109 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
110 err = -ENOMEM;
111 if (!buf) goto out;
112
113 err = -EINVAL;
114 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
115 goto out;
116
117 err = -ENOENT;
118 dom = auth_domain_find(buf);
119 if (!dom)
120 goto out;
121 dprintk("found domain %s\n", buf);
122
123 err = -EINVAL;
124 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
125 goto out;
126 fsidtype = simple_strtoul(buf, &ep, 10);
127 if (*ep)
128 goto out;
129 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700130 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 goto out;
132 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
133 goto out;
134 dprintk("found fsid length %d\n", len);
135 if (len != key_len(fsidtype))
136 goto out;
137
138 /* OK, we seem to have a valid key */
139 key.h.flags = 0;
140 key.h.expiry_time = get_expiry(&mesg);
141 if (key.h.expiry_time == 0)
142 goto out;
143
144 key.ek_client = dom;
145 key.ek_fsidtype = fsidtype;
146 memcpy(key.ek_fsid, buf, len);
147
NeilBrown8d270f7f2006-03-27 01:15:04 -0800148 ek = svc_expkey_lookup(&key);
149 err = -ENOMEM;
150 if (!ek)
151 goto out;
152
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f7f2006-03-27 01:15:04 -0800154 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
156 goto out;
157 dprintk("Path seems to be <%s>\n", buf);
158 err = 0;
159 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800161 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800163 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800164 else err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 } else {
166 struct nameidata nd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 err = path_lookup(buf, 0, &nd);
168 if (err)
169 goto out;
170
171 dprintk("Found the path %s\n", buf);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800172 key.ek_mnt = nd.mnt;
173 key.ek_dentry = nd.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
NeilBrown8d270f7f2006-03-27 01:15:04 -0800175 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800177 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800178 else
179 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 path_release(&nd);
181 }
182 cache_flush();
183 out:
184 if (dom)
185 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800186 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 return err;
188}
189
190static int expkey_show(struct seq_file *m,
191 struct cache_detail *cd,
192 struct cache_head *h)
193{
194 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800195 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 if (h ==NULL) {
198 seq_puts(m, "#domain fsidtype fsid [path]\n");
199 return 0;
200 }
201 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800202 seq_printf(m, "%s %d 0x", ek->ek_client->name,
203 ek->ek_fsidtype);
204 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
205 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (test_bit(CACHE_VALID, &h->flags) &&
207 !test_bit(CACHE_NEGATIVE, &h->flags)) {
208 seq_printf(m, " ");
NeilBrowneab7e2e2006-03-27 01:15:00 -0800209 seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
211 seq_printf(m, "\n");
212 return 0;
213}
NeilBrown8d270f7f2006-03-27 01:15:04 -0800214
215static inline int expkey_match (struct cache_head *a, struct cache_head *b)
216{
217 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
218 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
219
220 if (orig->ek_fsidtype != new->ek_fsidtype ||
221 orig->ek_client != new->ek_client ||
222 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
223 return 0;
224 return 1;
225}
226
227static inline void expkey_init(struct cache_head *cnew,
228 struct cache_head *citem)
229{
230 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
231 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
232
233 kref_get(&item->ek_client->ref);
234 new->ek_client = item->ek_client;
235 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800236
237 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f7f2006-03-27 01:15:04 -0800238}
239
240static inline void expkey_update(struct cache_head *cnew,
241 struct cache_head *citem)
242{
243 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
244 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
245
246 new->ek_mnt = mntget(item->ek_mnt);
247 new->ek_dentry = dget(item->ek_dentry);
248}
249
250static struct cache_head *expkey_alloc(void)
251{
252 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
253 if (i)
254 return &i->h;
255 else
256 return NULL;
257}
258
Adrian Bunk74cae612006-03-27 01:15:10 -0800259static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700260 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 .hash_size = EXPKEY_HASHMAX,
262 .hash_table = expkey_table,
263 .name = "nfsd.fh",
264 .cache_put = expkey_put,
265 .cache_request = expkey_request,
266 .cache_parse = expkey_parse,
267 .cache_show = expkey_show,
NeilBrown8d270f7f2006-03-27 01:15:04 -0800268 .match = expkey_match,
269 .init = expkey_init,
270 .update = expkey_update,
271 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272};
273
NeilBrown8d270f7f2006-03-27 01:15:04 -0800274static struct svc_expkey *
275svc_expkey_lookup(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800277 struct cache_head *ch;
278 int hash = item->ek_fsidtype;
279 char * cp = (char*)item->ek_fsid;
280 int len = key_len(item->ek_fsidtype);
281
282 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
283 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
284 hash &= EXPKEY_HASHMASK;
285
286 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
287 hash);
288 if (ch)
289 return container_of(ch, struct svc_expkey, h);
290 else
291 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}
293
NeilBrown8d270f7f2006-03-27 01:15:04 -0800294static struct svc_expkey *
295svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800297 struct cache_head *ch;
298 int hash = new->ek_fsidtype;
299 char * cp = (char*)new->ek_fsid;
300 int len = key_len(new->ek_fsidtype);
301
302 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
303 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
304 hash &= EXPKEY_HASHMASK;
305
306 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
307 &old->h, hash);
308 if (ch)
309 return container_of(ch, struct svc_expkey, h);
310 else
311 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314
315#define EXPORT_HASHBITS 8
316#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
317#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
318
319static struct cache_head *export_table[EXPORT_HASHMAX];
320
Manoj Naik933469192006-10-04 02:16:18 -0700321static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
322{
323 int i;
324
325 for (i = 0; i < fsloc->locations_count; i++) {
326 kfree(fsloc->locations[i].path);
327 kfree(fsloc->locations[i].hosts);
328 }
329 kfree(fsloc->locations);
330}
331
NeilBrownbaab9352006-03-27 01:15:09 -0800332static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
NeilBrownbaab9352006-03-27 01:15:09 -0800334 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
335 dput(exp->ex_dentry);
336 mntput(exp->ex_mnt);
337 auth_domain_put(exp->ex_client);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700338 kfree(exp->ex_path);
Manoj Naik933469192006-10-04 02:16:18 -0700339 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800340 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341}
342
343static void svc_export_request(struct cache_detail *cd,
344 struct cache_head *h,
345 char **bpp, int *blen)
346{
347 /* client path */
348 struct svc_export *exp = container_of(h, struct svc_export, h);
349 char *pth;
350
351 qword_add(bpp, blen, exp->ex_client->name);
352 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
353 if (IS_ERR(pth)) {
354 /* is this correct? */
355 (*bpp)[0] = '\n';
356 return;
357 }
358 qword_add(bpp, blen, pth);
359 (*bpp)[-1] = '\n';
360}
361
Adrian Bunk74cae612006-03-27 01:15:10 -0800362static struct svc_export *svc_export_update(struct svc_export *new,
363 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800364static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365
NeilBrownaf6a4e22007-02-14 00:33:12 -0800366static int check_export(struct inode *inode, int flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367{
368
369 /* We currently export only dirs and regular files.
370 * This is what umountd does.
371 */
372 if (!S_ISDIR(inode->i_mode) &&
373 !S_ISREG(inode->i_mode))
374 return -ENOTDIR;
375
376 /* There are two requirements on a filesystem to be exportable.
377 * 1: We must be able to identify the filesystem from a number.
378 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800379 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 * 2: We must be able to find an inode from a filehandle.
381 * This means that s_export_op must be set.
382 */
383 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800384 !(flags & NFSEXP_FSID) &&
385 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700386 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 return -EINVAL;
388 }
389 if (!inode->i_sb->s_export_op) {
390 dprintk("exp_export: export of invalid fs type.\n");
391 return -EINVAL;
392 }
393
394 /* Ok, we can export it */;
395 if (!inode->i_sb->s_export_op->find_exported_dentry)
396 inode->i_sb->s_export_op->find_exported_dentry =
397 find_exported_dentry;
398 return 0;
399
400}
401
Manoj Naik933469192006-10-04 02:16:18 -0700402#ifdef CONFIG_NFSD_V4
403
404static int
405fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
406{
407 int len;
408 int migrated, i, err;
409
Manoj Naik933469192006-10-04 02:16:18 -0700410 /* listsize */
411 err = get_int(mesg, &fsloc->locations_count);
412 if (err)
413 return err;
414 if (fsloc->locations_count > MAX_FS_LOCATIONS)
415 return -EINVAL;
416 if (fsloc->locations_count == 0)
417 return 0;
418
419 fsloc->locations = kzalloc(fsloc->locations_count
420 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
421 if (!fsloc->locations)
422 return -ENOMEM;
423 for (i=0; i < fsloc->locations_count; i++) {
424 /* colon separated host list */
425 err = -EINVAL;
426 len = qword_get(mesg, buf, PAGE_SIZE);
427 if (len <= 0)
428 goto out_free_all;
429 err = -ENOMEM;
430 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
431 if (!fsloc->locations[i].hosts)
432 goto out_free_all;
433 err = -EINVAL;
434 /* slash separated path component list */
435 len = qword_get(mesg, buf, PAGE_SIZE);
436 if (len <= 0)
437 goto out_free_all;
438 err = -ENOMEM;
439 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
440 if (!fsloc->locations[i].path)
441 goto out_free_all;
442 }
443 /* migrated */
444 err = get_int(mesg, &migrated);
445 if (err)
446 goto out_free_all;
447 err = -EINVAL;
448 if (migrated < 0 || migrated > 1)
449 goto out_free_all;
450 fsloc->migrated = migrated;
451 return 0;
452out_free_all:
453 nfsd4_fslocs_free(fsloc);
454 return err;
455}
456
Andy Adamsone677bfe2007-07-17 04:04:42 -0700457static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
458{
459 int listsize, err;
460 struct exp_flavor_info *f;
461
462 err = get_int(mesg, &listsize);
463 if (err)
464 return err;
465 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
466 return -EINVAL;
467
468 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
469 err = get_int(mesg, &f->pseudoflavor);
470 if (err)
471 return err;
472 /*
473 * Just a quick sanity check; we could also try to check
474 * whether this pseudoflavor is supported, but at worst
475 * an unsupported pseudoflavor on the export would just
476 * be a pseudoflavor that won't match the flavor of any
477 * authenticated request. The administrator will
478 * probably discover the problem when someone fails to
479 * authenticate.
480 */
481 if (f->pseudoflavor < 0)
482 return -EINVAL;
483 err = get_int(mesg, &f->flags);
484 if (err)
485 return err;
486 /* Only some flags are allowed to differ between flavors: */
487 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
488 return -EINVAL;
489 }
490 exp->ex_nflavors = listsize;
491 return 0;
492}
493
Manoj Naik933469192006-10-04 02:16:18 -0700494#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700495static inline int
496fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
497static inline int
498secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik933469192006-10-04 02:16:18 -0700499#endif
500
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
502{
503 /* client path expiry [flags anonuid anongid fsid] */
504 char *buf;
505 int len;
506 int err;
507 struct auth_domain *dom = NULL;
508 struct nameidata nd;
509 struct svc_export exp, *expp;
510 int an_int;
511
512 nd.dentry = NULL;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700513 exp.ex_path = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
NeilBrown402acd22007-05-09 02:34:52 -0700515 /* fs locations */
516 exp.ex_fslocs.locations = NULL;
517 exp.ex_fslocs.locations_count = 0;
518 exp.ex_fslocs.migrated = 0;
519
520 exp.ex_uuid = NULL;
521
Andy Adamsone677bfe2007-07-17 04:04:42 -0700522 /* secinfo */
523 exp.ex_nflavors = 0;
524
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 if (mesg[mlen-1] != '\n')
526 return -EINVAL;
527 mesg[mlen-1] = 0;
528
529 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
530 err = -ENOMEM;
531 if (!buf) goto out;
532
533 /* client */
534 len = qword_get(&mesg, buf, PAGE_SIZE);
535 err = -EINVAL;
536 if (len <= 0) goto out;
537
538 err = -ENOENT;
539 dom = auth_domain_find(buf);
540 if (!dom)
541 goto out;
542
543 /* path */
544 err = -EINVAL;
545 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
546 goto out;
547 err = path_lookup(buf, 0, &nd);
NeilBrowncd156542006-04-10 22:55:27 -0700548 if (err) goto out_no_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550 exp.h.flags = 0;
551 exp.ex_client = dom;
552 exp.ex_mnt = nd.mnt;
553 exp.ex_dentry = nd.dentry;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700554 exp.ex_path = kstrdup(buf, GFP_KERNEL);
555 err = -ENOMEM;
556 if (!exp.ex_path)
557 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558
559 /* expiry */
560 err = -EINVAL;
561 exp.h.expiry_time = get_expiry(&mesg);
562 if (exp.h.expiry_time == 0)
563 goto out;
564
565 /* flags */
566 err = get_int(&mesg, &an_int);
567 if (err == -ENOENT)
568 set_bit(CACHE_NEGATIVE, &exp.h.flags);
569 else {
570 if (err || an_int < 0) goto out;
571 exp.ex_flags= an_int;
572
573 /* anon uid */
574 err = get_int(&mesg, &an_int);
575 if (err) goto out;
576 exp.ex_anon_uid= an_int;
577
578 /* anon gid */
579 err = get_int(&mesg, &an_int);
580 if (err) goto out;
581 exp.ex_anon_gid= an_int;
582
583 /* fsid */
584 err = get_int(&mesg, &an_int);
585 if (err) goto out;
586 exp.ex_fsid = an_int;
587
NeilBrownaf6a4e22007-02-14 00:33:12 -0800588 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
589 if (strcmp(buf, "fsloc") == 0)
590 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
591 else if (strcmp(buf, "uuid") == 0) {
592 /* expect a 16 byte uuid encoded as \xXXXX... */
593 len = qword_get(&mesg, buf, PAGE_SIZE);
594 if (len != 16)
595 err = -EINVAL;
596 else {
597 exp.ex_uuid =
598 kmemdup(buf, 16, GFP_KERNEL);
599 if (exp.ex_uuid == NULL)
600 err = -ENOMEM;
601 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700602 } else if (strcmp(buf, "secinfo") == 0)
603 err = secinfo_parse(&mesg, buf, &exp);
604 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800605 /* quietly ignore unknown words and anything
606 * following. Newer user-space can try to set
607 * new values, then see what the result was.
608 */
609 break;
610 if (err)
611 goto out;
612 }
Manoj Naik933469192006-10-04 02:16:18 -0700613
NeilBrownaf6a4e22007-02-14 00:33:12 -0800614 err = check_export(nd.dentry->d_inode, exp.ex_flags,
615 exp.ex_uuid);
616 if (err) goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700617 }
618
NeilBrown4f7774c2006-03-27 01:15:03 -0800619 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800621 expp = svc_export_update(&exp, expp);
622 else
623 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800625 if (expp == NULL)
626 err = -ENOMEM;
627 else
628 exp_put(expp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700629 out:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800630 nfsd4_fslocs_free(&exp.ex_fslocs);
631 kfree(exp.ex_uuid);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700632 kfree(exp.ex_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 if (nd.dentry)
634 path_release(&nd);
NeilBrowncd156542006-04-10 22:55:27 -0700635 out_no_path:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 if (dom)
637 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800638 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700639 return err;
640}
641
Manoj Naik933469192006-10-04 02:16:18 -0700642static void exp_flags(struct seq_file *m, int flag, int fsid,
643 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700644static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
646static int svc_export_show(struct seq_file *m,
647 struct cache_detail *cd,
648 struct cache_head *h)
649{
650 struct svc_export *exp ;
651
652 if (h ==NULL) {
653 seq_puts(m, "#path domain(flags)\n");
654 return 0;
655 }
656 exp = container_of(h, struct svc_export, h);
657 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
658 seq_putc(m, '\t');
659 seq_escape(m, exp->ex_client->name, " \t\n\\");
660 seq_putc(m, '(');
661 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800662 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700663 exp_flags(m, exp->ex_flags, exp->ex_fsid,
664 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800665 if (exp->ex_uuid) {
666 int i;
667 seq_puts(m, ",uuid=");
668 for (i=0; i<16; i++) {
669 if ((i&3) == 0 && i)
670 seq_putc(m, ':');
671 seq_printf(m, "%02x", exp->ex_uuid[i]);
672 }
673 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700674 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676 seq_puts(m, ")\n");
677 return 0;
678}
NeilBrown4f7774c2006-03-27 01:15:03 -0800679static int svc_export_match(struct cache_head *a, struct cache_head *b)
680{
681 struct svc_export *orig = container_of(a, struct svc_export, h);
682 struct svc_export *new = container_of(b, struct svc_export, h);
683 return orig->ex_client == new->ex_client &&
684 orig->ex_dentry == new->ex_dentry &&
685 orig->ex_mnt == new->ex_mnt;
686}
687
688static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
689{
690 struct svc_export *new = container_of(cnew, struct svc_export, h);
691 struct svc_export *item = container_of(citem, struct svc_export, h);
692
693 kref_get(&item->ex_client->ref);
694 new->ex_client = item->ex_client;
695 new->ex_dentry = dget(item->ex_dentry);
696 new->ex_mnt = mntget(item->ex_mnt);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700697 new->ex_path = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700698 new->ex_fslocs.locations = NULL;
699 new->ex_fslocs.locations_count = 0;
700 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800701}
702
703static void export_update(struct cache_head *cnew, struct cache_head *citem)
704{
705 struct svc_export *new = container_of(cnew, struct svc_export, h);
706 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700707 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800708
709 new->ex_flags = item->ex_flags;
710 new->ex_anon_uid = item->ex_anon_uid;
711 new->ex_anon_gid = item->ex_anon_gid;
712 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800713 new->ex_uuid = item->ex_uuid;
714 item->ex_uuid = NULL;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700715 new->ex_path = item->ex_path;
716 item->ex_path = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700717 new->ex_fslocs.locations = item->ex_fslocs.locations;
718 item->ex_fslocs.locations = NULL;
719 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
720 item->ex_fslocs.locations_count = 0;
721 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
722 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700723 new->ex_nflavors = item->ex_nflavors;
724 for (i = 0; i < MAX_SECINFO_LIST; i++) {
725 new->ex_flavors[i] = item->ex_flavors[i];
726 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800727}
728
729static struct cache_head *svc_export_alloc(void)
730{
731 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
732 if (i)
733 return &i->h;
734 else
735 return NULL;
736}
737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700739 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 .hash_size = EXPORT_HASHMAX,
741 .hash_table = export_table,
742 .name = "nfsd.export",
743 .cache_put = svc_export_put,
744 .cache_request = svc_export_request,
745 .cache_parse = svc_export_parse,
746 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800747 .match = svc_export_match,
748 .init = svc_export_init,
749 .update = export_update,
750 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751};
752
NeilBrown4f7774c2006-03-27 01:15:03 -0800753static struct svc_export *
754svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
NeilBrown4f7774c2006-03-27 01:15:03 -0800756 struct cache_head *ch;
757 int hash;
758 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
759 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
760 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
761
762 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
763 hash);
764 if (ch)
765 return container_of(ch, struct svc_export, h);
766 else
767 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768}
769
Adrian Bunk74cae612006-03-27 01:15:10 -0800770static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800771svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772{
NeilBrown4f7774c2006-03-27 01:15:03 -0800773 struct cache_head *ch;
774 int hash;
775 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
776 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
777 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
NeilBrown4f7774c2006-03-27 01:15:03 -0800779 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
780 &old->h,
781 hash);
782 if (ch)
783 return container_of(ch, struct svc_export, h);
784 else
785 return NULL;
786}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788
Adrian Bunk74cae612006-03-27 01:15:10 -0800789static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
791{
792 struct svc_expkey key, *ek;
793 int err;
794
795 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700796 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797
798 key.ek_client = clp;
799 key.ek_fsidtype = fsid_type;
800 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
801
NeilBrown8d270f7f2006-03-27 01:15:04 -0800802 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700803 if (ek == NULL)
804 return ERR_PTR(-ENOMEM);
805 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
806 if (err)
807 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700808 return ek;
809}
810
811static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
812 struct svc_export *exp)
813{
814 struct svc_expkey key, *ek;
815
816 key.ek_client = clp;
817 key.ek_fsidtype = fsid_type;
818 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
NeilBrowneab7e2e2006-03-27 01:15:00 -0800819 key.ek_mnt = exp->ex_mnt;
820 key.ek_dentry = exp->ex_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 key.h.expiry_time = NEVER;
822 key.h.flags = 0;
823
NeilBrown8d270f7f2006-03-27 01:15:04 -0800824 ek = svc_expkey_lookup(&key);
825 if (ek)
826 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800828 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829 return 0;
830 }
831 return -ENOMEM;
832}
833
834/*
835 * Find the client's export entry matching xdev/xino.
836 */
837static inline struct svc_expkey *
838exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
839{
840 u32 fsidv[3];
841
842 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800843 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
844 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800846 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
847 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848}
849
850/*
851 * Find the client's export entry matching fsid
852 */
853static inline struct svc_expkey *
854exp_get_fsid_key(svc_client *clp, int fsid)
855{
856 u32 fsidv[2];
857
NeilBrownaf6a4e22007-02-14 00:33:12 -0800858 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859
NeilBrownaf6a4e22007-02-14 00:33:12 -0800860 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861}
862
863svc_export *
864exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
865 struct cache_req *reqp)
866{
867 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700868 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
870 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700871 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
873 key.ex_client = clp;
874 key.ex_mnt = mnt;
875 key.ex_dentry = dentry;
876
NeilBrown4f7774c2006-03-27 01:15:03 -0800877 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700878 if (exp == NULL)
879 return ERR_PTR(-ENOMEM);
880 err = cache_check(&svc_export_cache, &exp->h, reqp);
881 if (err)
882 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883 return exp;
884}
885
886/*
887 * Find the export entry for a given dentry.
888 */
889struct svc_export *
890exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
891 struct cache_req *reqp)
892{
893 svc_export *exp;
894
895 dget(dentry);
896 exp = exp_get_by_name(clp, mnt, dentry, reqp);
897
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700898 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 struct dentry *parent;
900
901 parent = dget_parent(dentry);
902 dput(dentry);
903 dentry = parent;
904 exp = exp_get_by_name(clp, mnt, dentry, reqp);
905 }
906 dput(dentry);
907 return exp;
908}
909
910/*
911 * Hashtable locking. Write locks are placed only by user processes
912 * wanting to modify export information.
913 * Write locking only done in this file. Read locking
914 * needed externally.
915 */
916
917static DECLARE_RWSEM(hash_sem);
918
919void
920exp_readlock(void)
921{
922 down_read(&hash_sem);
923}
924
925static inline void
926exp_writelock(void)
927{
928 down_write(&hash_sem);
929}
930
931void
932exp_readunlock(void)
933{
934 up_read(&hash_sem);
935}
936
937static inline void
938exp_writeunlock(void)
939{
940 up_write(&hash_sem);
941}
942
943static void exp_fsid_unhash(struct svc_export *exp)
944{
945 struct svc_expkey *ek;
946
947 if ((exp->ex_flags & NFSEXP_FSID) == 0)
948 return;
949
950 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700951 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800953 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954 }
955 svc_expkey_cache.nextcheck = get_seconds();
956}
957
958static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
959{
960 u32 fsid[2];
961
962 if ((exp->ex_flags & NFSEXP_FSID) == 0)
963 return 0;
964
NeilBrownaf6a4e22007-02-14 00:33:12 -0800965 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
966 return exp_set_key(clp, FSID_NUM, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967}
968
969static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
970{
971 u32 fsid[2];
972 struct inode *inode = exp->ex_dentry->d_inode;
973 dev_t dev = inode->i_sb->s_dev;
974
975 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800976 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
977 return exp_set_key(clp, FSID_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800979 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
980 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981}
982
983static void exp_unhash(struct svc_export *exp)
984{
985 struct svc_expkey *ek;
986 struct inode *inode = exp->ex_dentry->d_inode;
987
988 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700989 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800991 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 }
993 svc_expkey_cache.nextcheck = get_seconds();
994}
995
996/*
997 * Export a file system.
998 */
999int
1000exp_export(struct nfsctl_export *nxp)
1001{
1002 svc_client *clp;
1003 struct svc_export *exp = NULL;
1004 struct svc_export new;
1005 struct svc_expkey *fsid_key = NULL;
1006 struct nameidata nd;
1007 int err;
1008
1009 /* Consistency check */
1010 err = -EINVAL;
1011 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1012 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1013 goto out;
1014
1015 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1016 nxp->ex_client, nxp->ex_path,
1017 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1018 nxp->ex_flags);
1019
1020 /* Try to lock the export table for update */
1021 exp_writelock();
1022
1023 /* Look up client info */
1024 if (!(clp = auth_domain_find(nxp->ex_client)))
1025 goto out_unlock;
1026
1027
1028 /* Look up the dentry */
1029 err = path_lookup(nxp->ex_path, 0, &nd);
1030 if (err)
1031 goto out_unlock;
1032 err = -EINVAL;
1033
1034 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
1035
NeilBrownf9884432006-12-13 00:35:45 -08001036 memset(&new, 0, sizeof(new));
1037
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 /* must make sure there won't be an ex_fsid clash */
1039 if ((nxp->ex_flags & NFSEXP_FSID) &&
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001040 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
NeilBrowneab7e2e2006-03-27 01:15:00 -08001041 fsid_key->ek_mnt &&
1042 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 goto finish;
1044
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001045 if (!IS_ERR(exp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 /* just a flags/id/fsid update */
1047
1048 exp_fsid_unhash(exp);
1049 exp->ex_flags = nxp->ex_flags;
1050 exp->ex_anon_uid = nxp->ex_anon_uid;
1051 exp->ex_anon_gid = nxp->ex_anon_gid;
1052 exp->ex_fsid = nxp->ex_dev;
1053
1054 err = exp_fsid_hash(clp, exp);
1055 goto finish;
1056 }
1057
NeilBrownaf6a4e22007-02-14 00:33:12 -08001058 err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 if (err) goto finish;
1060
1061 err = -ENOMEM;
1062
1063 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1064
1065 new.h.expiry_time = NEVER;
1066 new.h.flags = 0;
NeilBrownf9884432006-12-13 00:35:45 -08001067 new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL);
1068 if (!new.ex_path)
1069 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 new.ex_client = clp;
1071 new.ex_mnt = nd.mnt;
1072 new.ex_dentry = nd.dentry;
1073 new.ex_flags = nxp->ex_flags;
1074 new.ex_anon_uid = nxp->ex_anon_uid;
1075 new.ex_anon_gid = nxp->ex_anon_gid;
1076 new.ex_fsid = nxp->ex_dev;
1077
NeilBrown4f7774c2006-03-27 01:15:03 -08001078 exp = svc_export_lookup(&new);
1079 if (exp)
1080 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081
NeilBrown4f7774c2006-03-27 01:15:03 -08001082 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001083 goto finish;
1084
Linus Torvalds1da177e2005-04-16 15:20:36 -07001085 if (exp_hash(clp, exp) ||
1086 exp_fsid_hash(clp, exp)) {
1087 /* failed to create at least one index */
1088 exp_do_unexport(exp);
1089 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001090 } else
1091 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092finish:
NeilBrownf9884432006-12-13 00:35:45 -08001093 if (new.ex_path)
1094 kfree(new.ex_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 if (exp)
1096 exp_put(exp);
1097 if (fsid_key && !IS_ERR(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001098 cache_put(&fsid_key->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 if (clp)
1100 auth_domain_put(clp);
1101 path_release(&nd);
1102out_unlock:
1103 exp_writeunlock();
1104out:
1105 return err;
1106}
1107
1108/*
1109 * Unexport a file system. The export entry has already
1110 * been removed from the client's list of exported fs's.
1111 */
1112static void
1113exp_do_unexport(svc_export *unexp)
1114{
1115 unexp->h.expiry_time = get_seconds()-1;
1116 svc_export_cache.nextcheck = get_seconds();
1117 exp_unhash(unexp);
1118 exp_fsid_unhash(unexp);
1119}
1120
1121
1122/*
1123 * unexport syscall.
1124 */
1125int
1126exp_unexport(struct nfsctl_export *nxp)
1127{
1128 struct auth_domain *dom;
1129 svc_export *exp;
1130 struct nameidata nd;
1131 int err;
1132
1133 /* Consistency check */
1134 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1135 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1136 return -EINVAL;
1137
1138 exp_writelock();
1139
1140 err = -EINVAL;
1141 dom = auth_domain_find(nxp->ex_client);
1142 if (!dom) {
1143 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1144 goto out_unlock;
1145 }
1146
1147 err = path_lookup(nxp->ex_path, 0, &nd);
1148 if (err)
1149 goto out_domain;
1150
1151 err = -EINVAL;
1152 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
1153 path_release(&nd);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001154 if (IS_ERR(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001155 goto out_domain;
1156
1157 exp_do_unexport(exp);
1158 exp_put(exp);
1159 err = 0;
1160
1161out_domain:
1162 auth_domain_put(dom);
1163 cache_flush();
1164out_unlock:
1165 exp_writeunlock();
1166 return err;
1167}
1168
1169/*
1170 * Obtain the root fh on behalf of a client.
1171 * This could be done in user space, but I feel that it adds some safety
1172 * since its harder to fool a kernel module than a user space program.
1173 */
1174int
1175exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1176{
1177 struct svc_export *exp;
1178 struct nameidata nd;
1179 struct inode *inode;
1180 struct svc_fh fh;
1181 int err;
1182
1183 err = -EPERM;
1184 /* NB: we probably ought to check that it's NUL-terminated */
1185 if (path_lookup(path, 0, &nd)) {
1186 printk("nfsd: exp_rootfh path not found %s", path);
1187 return err;
1188 }
1189 inode = nd.dentry->d_inode;
1190
1191 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1192 path, nd.dentry, clp->name,
1193 inode->i_sb->s_id, inode->i_ino);
1194 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001195 if (IS_ERR(exp)) {
1196 err = PTR_ERR(exp);
1197 goto out;
1198 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199
1200 /*
1201 * fh must be initialized before calling fh_compose
1202 */
1203 fh_init(&fh, maxsize);
1204 if (fh_compose(&fh, exp, nd.dentry, NULL))
1205 err = -EINVAL;
1206 else
1207 err = 0;
1208 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1209 fh_put(&fh);
1210 exp_put(exp);
1211out:
1212 path_release(&nd);
1213 return err;
1214}
1215
NeilBrowneab7e2e2006-03-27 01:15:00 -08001216struct svc_export *
1217exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1218 struct cache_req *reqp)
1219{
1220 struct svc_export *exp;
1221 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001222 if (IS_ERR(ek))
NeilBrowneab7e2e2006-03-27 01:15:00 -08001223 return ERR_PTR(PTR_ERR(ek));
1224
1225 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001226 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001227
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001228 if (IS_ERR(exp))
NeilBrowneab7e2e2006-03-27 01:15:00 -08001229 return ERR_PTR(PTR_ERR(exp));
1230 return exp;
1231}
1232
Andy Adamson32c1eb02007-07-17 04:04:48 -07001233__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1234{
1235 struct exp_flavor_info *f;
1236 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1237
1238 /* legacy gss-only clients are always OK: */
1239 if (exp->ex_client == rqstp->rq_gssclient)
1240 return 0;
1241 /* ip-address based client; check sec= export option: */
1242 for (f = exp->ex_flavors; f < end; f++) {
1243 if (f->pseudoflavor == rqstp->rq_flavor)
1244 return 0;
1245 }
1246 /* defaults in absence of sec= options: */
1247 if (exp->ex_nflavors == 0) {
1248 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1249 rqstp->rq_flavor == RPC_AUTH_UNIX)
1250 return 0;
1251 }
1252 return nfserr_wrongsec;
1253}
1254
J. Bruce Fields0989a782007-07-17 04:04:44 -07001255/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001256 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1257 * auth_unix client) if it's available and has secinfo information;
1258 * otherwise, will try to use rq_gssclient.
1259 *
J. Bruce Fields0989a782007-07-17 04:04:44 -07001260 * Called from functions that handle requests; functions that do work on
1261 * behalf of mountd are passed a single client name to use, and should
1262 * use exp_get_by_name() or exp_find().
1263 */
1264struct svc_export *
1265rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1266 struct dentry *dentry)
1267{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001268 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001269
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001270 if (rqstp->rq_client == NULL)
1271 goto gss;
1272
1273 /* First try the auth_unix client: */
1274 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1275 &rqstp->rq_chandle);
1276 if (PTR_ERR(exp) == -ENOENT)
1277 goto gss;
1278 if (IS_ERR(exp))
1279 return exp;
1280 /* If it has secinfo, assume there are no gss/... clients */
1281 if (exp->ex_nflavors > 0)
1282 return exp;
1283gss:
1284 /* Otherwise, try falling back on gss client */
1285 if (rqstp->rq_gssclient == NULL)
1286 return exp;
1287 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1288 &rqstp->rq_chandle);
1289 if (PTR_ERR(gssexp) == -ENOENT)
1290 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001291 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001292 exp_put(exp);
1293 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001294}
1295
1296struct svc_export *
1297rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1298{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001299 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001300
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001301 if (rqstp->rq_client == NULL)
1302 goto gss;
1303
1304 /* First try the auth_unix client: */
1305 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1306 if (PTR_ERR(exp) == -ENOENT)
1307 goto gss;
1308 if (IS_ERR(exp))
1309 return exp;
1310 /* If it has secinfo, assume there are no gss/... clients */
1311 if (exp->ex_nflavors > 0)
1312 return exp;
1313gss:
1314 /* Otherwise, try falling back on gss client */
1315 if (rqstp->rq_gssclient == NULL)
1316 return exp;
1317 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1318 &rqstp->rq_chandle);
1319 if (PTR_ERR(gssexp) == -ENOENT)
1320 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001321 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001322 exp_put(exp);
1323 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001324}
1325
1326struct svc_export *
1327rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1328 struct dentry *dentry)
1329{
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001330 struct svc_export *exp;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001331
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001332 dget(dentry);
1333 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1334
1335 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1336 struct dentry *parent;
1337
1338 parent = dget_parent(dentry);
1339 dput(dentry);
1340 dentry = parent;
1341 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1342 }
1343 dput(dentry);
1344 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001345}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001346
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347/*
1348 * Called when we need the filehandle for the root of the pseudofs,
1349 * for a given NFSv4 client. The root is defined to be the
1350 * export point with fsid==0
1351 */
Al Viroc7afef12006-10-19 23:29:02 -07001352__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001353exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001355 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001356 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001357 u32 fsidv[2];
1358
NeilBrownaf6a4e22007-02-14 00:33:12 -08001359 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360
J. Bruce Fields0989a782007-07-17 04:04:44 -07001361 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001362 if (PTR_ERR(exp) == -ENOENT)
1363 return nfserr_perm;
J.Bruce Fields68993202006-12-13 00:35:23 -08001364 if (IS_ERR(exp))
1365 return nfserrno(PTR_ERR(exp));
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001366 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001367 if (rv)
1368 goto out;
1369 rv = check_nfsd_access(exp, rqstp);
1370out:
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001371 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372 return rv;
1373}
1374
1375/* Iterator */
1376
1377static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001378 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379{
1380 loff_t n = *pos;
1381 unsigned hash, export;
1382 struct cache_head *ch;
1383
1384 exp_readlock();
1385 read_lock(&svc_export_cache.hash_lock);
1386 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001387 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 hash = n >> 32;
1389 export = n & ((1LL<<32) - 1);
1390
1391
1392 for (ch=export_table[hash]; ch; ch=ch->next)
1393 if (!export--)
1394 return ch;
1395 n &= ~((1LL<<32) - 1);
1396 do {
1397 hash++;
1398 n += 1LL<<32;
1399 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1400 if (hash >= EXPORT_HASHMAX)
1401 return NULL;
1402 *pos = n+1;
1403 return export_table[hash];
1404}
1405
1406static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1407{
1408 struct cache_head *ch = p;
1409 int hash = (*pos >> 32);
1410
Greg Banksbc6f02e2006-10-02 02:17:49 -07001411 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412 hash = 0;
1413 else if (ch->next == NULL) {
1414 hash++;
1415 *pos += 1LL<<32;
1416 } else {
1417 ++*pos;
1418 return ch->next;
1419 }
1420 *pos &= ~((1LL<<32) - 1);
1421 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1422 hash++;
1423 *pos += 1LL<<32;
1424 }
1425 if (hash >= EXPORT_HASHMAX)
1426 return NULL;
1427 ++*pos;
1428 return export_table[hash];
1429}
1430
1431static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001432 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001433{
1434 read_unlock(&svc_export_cache.hash_lock);
1435 exp_readunlock();
1436}
1437
1438static struct flags {
1439 int flag;
1440 char *name[2];
1441} expflags[] = {
1442 { NFSEXP_READONLY, {"ro", "rw"}},
1443 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1444 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1445 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1446 { NFSEXP_ASYNC, {"async", "sync"}},
1447 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1448 { NFSEXP_NOHIDE, {"nohide", ""}},
1449 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1450 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1451 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1452#ifdef MSNFS
1453 { NFSEXP_MSNFS, {"msnfs", ""}},
1454#endif
1455 { 0, {"", ""}}
1456};
1457
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001458static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001459{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001460 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001461 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462
1463 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001464 if (flg->flag & ~mask)
1465 continue;
1466 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001467 if (*flg->name[state])
1468 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1469 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001470}
1471
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001472static void show_secinfo_flags(struct seq_file *m, int flags)
1473{
1474 seq_printf(m, ",");
1475 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1476}
1477
1478static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1479{
1480 struct exp_flavor_info *f;
1481 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1482 int lastflags = 0, first = 0;
1483
1484 if (exp->ex_nflavors == 0)
1485 return;
1486 for (f = exp->ex_flavors; f < end; f++) {
1487 if (first || f->flags != lastflags) {
1488 if (!first)
1489 show_secinfo_flags(m, lastflags);
1490 seq_printf(m, ",sec=%d", f->pseudoflavor);
1491 lastflags = f->flags;
1492 } else {
1493 seq_printf(m, ":%d", f->pseudoflavor);
1494 }
1495 }
1496 show_secinfo_flags(m, lastflags);
1497}
1498
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001499static void exp_flags(struct seq_file *m, int flag, int fsid,
1500 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1501{
1502 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001504 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001505 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001506 seq_printf(m, ",sanonuid=%d", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001508 seq_printf(m, ",sanongid=%d", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001509 if (fsloc && fsloc->locations_count > 0) {
1510 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1511 int i;
1512
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001513 seq_printf(m, ",%s=", loctype);
Manoj Naik933469192006-10-04 02:16:18 -07001514 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1515 seq_putc(m, '@');
1516 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1517 for (i = 1; i < fsloc->locations_count; i++) {
1518 seq_putc(m, ';');
1519 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1520 seq_putc(m, '@');
1521 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1522 }
1523 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001524}
1525
1526static int e_show(struct seq_file *m, void *p)
1527{
1528 struct cache_head *cp = p;
1529 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530
Greg Banksbc6f02e2006-10-02 02:17:49 -07001531 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 seq_puts(m, "# Version 1.1\n");
1533 seq_puts(m, "# Path Client(Flags) # IPs\n");
1534 return 0;
1535 }
1536
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537 cache_get(&exp->h);
1538 if (cache_check(&svc_export_cache, &exp->h, NULL))
1539 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001540 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 return svc_export_show(m, &svc_export_cache, cp);
1542}
1543
1544struct seq_operations nfs_exports_op = {
1545 .start = e_start,
1546 .next = e_next,
1547 .stop = e_stop,
1548 .show = e_show,
1549};
1550
1551/*
1552 * Add or modify a client.
1553 * Change requests may involve the list of host addresses. The list of
1554 * exports and possibly existing uid maps are left untouched.
1555 */
1556int
1557exp_addclient(struct nfsctl_client *ncp)
1558{
1559 struct auth_domain *dom;
1560 int i, err;
1561
1562 /* First, consistency check. */
1563 err = -EINVAL;
1564 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1565 goto out;
1566 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1567 goto out;
1568
1569 /* Lock the hashtable */
1570 exp_writelock();
1571
1572 dom = unix_domain_find(ncp->cl_ident);
1573
1574 err = -ENOMEM;
1575 if (!dom)
1576 goto out_unlock;
1577
1578 /* Insert client into hashtable. */
1579 for (i = 0; i < ncp->cl_naddr; i++)
1580 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1581
1582 auth_unix_forget_old(dom);
1583 auth_domain_put(dom);
1584
1585 err = 0;
1586
1587out_unlock:
1588 exp_writeunlock();
1589out:
1590 return err;
1591}
1592
1593/*
1594 * Delete a client given an identifier.
1595 */
1596int
1597exp_delclient(struct nfsctl_client *ncp)
1598{
1599 int err;
1600 struct auth_domain *dom;
1601
1602 err = -EINVAL;
1603 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1604 goto out;
1605
1606 /* Lock the hashtable */
1607 exp_writelock();
1608
1609 dom = auth_domain_find(ncp->cl_ident);
1610 /* just make sure that no addresses work
1611 * and that it will expire soon
1612 */
1613 if (dom) {
1614 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001615 auth_domain_put(dom);
1616 }
1617
1618 exp_writeunlock();
1619out:
1620 return err;
1621}
1622
1623/*
1624 * Verify that string is non-empty and does not exceed max length.
1625 */
1626static int
1627exp_verify_string(char *cp, int max)
1628{
1629 int i;
1630
1631 for (i = 0; i < max; i++)
1632 if (!cp[i])
1633 return i;
1634 cp[i] = 0;
1635 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1636 return 0;
1637}
1638
1639/*
1640 * Initialize the exports module.
1641 */
1642void
1643nfsd_export_init(void)
1644{
1645 dprintk("nfsd: initializing export module.\n");
1646
1647 cache_register(&svc_export_cache);
1648 cache_register(&svc_expkey_cache);
1649
1650}
1651
1652/*
1653 * Flush exports table - called when last nfsd thread is killed
1654 */
1655void
1656nfsd_export_flush(void)
1657{
1658 exp_writelock();
1659 cache_purge(&svc_expkey_cache);
1660 cache_purge(&svc_export_cache);
1661 exp_writeunlock();
1662}
1663
1664/*
1665 * Shutdown the exports module.
1666 */
1667void
1668nfsd_export_shutdown(void)
1669{
1670
1671 dprintk("nfsd: shutting down export module.\n");
1672
1673 exp_writelock();
1674
1675 if (cache_unregister(&svc_expkey_cache))
1676 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1677 if (cache_unregister(&svc_export_cache))
1678 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1679 svcauth_unix_purge();
1680
1681 exp_writeunlock();
1682 dprintk("nfsd: export shutdown complete.\n");
1683}