blob: 33bfcf09db46faaffa13472d1ffd351c7dad28fb [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>
Aurélien Charbonf15364b2008-01-18 15:50:56 +010038#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
40#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42typedef struct auth_domain svc_client;
43typedef struct svc_export svc_export;
44
45static void exp_do_unexport(svc_export *unexp);
46static int exp_verify_string(char *cp, int max);
47
48/*
49 * We have two caches.
50 * One maps client+vfsmnt+dentry to export options - the export map
51 * The other maps client+filehandle-fragment to export options. - the expkey map
52 *
53 * The export options are actually stored in the first map, and the
54 * second map contains a reference to the entry in the first map.
55 */
56
57#define EXPKEY_HASHBITS 8
58#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
59#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
60static struct cache_head *expkey_table[EXPKEY_HASHMAX];
61
Adrian Bunk74cae612006-03-27 01:15:10 -080062static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
NeilBrownbaab9352006-03-27 01:15:09 -080064 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
65
66 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080067 !test_bit(CACHE_NEGATIVE, &key->h.flags))
68 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080069 auth_domain_put(key->ek_client);
70 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071}
72
73static void expkey_request(struct cache_detail *cd,
74 struct cache_head *h,
75 char **bpp, int *blen)
76{
77 /* client fsidtype \xfsid */
78 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
79 char type[5];
80
81 qword_add(bpp, blen, ek->ek_client->name);
82 snprintf(type, 5, "%d", ek->ek_fsidtype);
83 qword_add(bpp, blen, type);
84 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
85 (*bpp)[-1] = '\n';
86}
87
NeilBrown8d270f7f2006-03-27 01:15:04 -080088static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
89static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080090static struct cache_detail svc_expkey_cache;
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
93{
94 /* client fsidtype fsid [path] */
95 char *buf;
96 int len;
97 struct auth_domain *dom = NULL;
98 int err;
99 int fsidtype;
100 char *ep;
101 struct svc_expkey key;
NeilBrown8d270f7f2006-03-27 01:15:04 -0800102 struct svc_expkey *ek;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 if (mesg[mlen-1] != '\n')
105 return -EINVAL;
106 mesg[mlen-1] = 0;
107
108 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
109 err = -ENOMEM;
110 if (!buf) goto out;
111
112 err = -EINVAL;
113 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
114 goto out;
115
116 err = -ENOENT;
117 dom = auth_domain_find(buf);
118 if (!dom)
119 goto out;
120 dprintk("found domain %s\n", buf);
121
122 err = -EINVAL;
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 goto out;
125 fsidtype = simple_strtoul(buf, &ep, 10);
126 if (*ep)
127 goto out;
128 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700129 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 goto out;
131 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
132 goto out;
133 dprintk("found fsid length %d\n", len);
134 if (len != key_len(fsidtype))
135 goto out;
136
137 /* OK, we seem to have a valid key */
138 key.h.flags = 0;
139 key.h.expiry_time = get_expiry(&mesg);
140 if (key.h.expiry_time == 0)
141 goto out;
142
143 key.ek_client = dom;
144 key.ek_fsidtype = fsidtype;
145 memcpy(key.ek_fsid, buf, len);
146
NeilBrown8d270f7f2006-03-27 01:15:04 -0800147 ek = svc_expkey_lookup(&key);
148 err = -ENOMEM;
149 if (!ek)
150 goto out;
151
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f7f2006-03-27 01:15:04 -0800153 err = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
155 goto out;
156 dprintk("Path seems to be <%s>\n", buf);
157 err = 0;
158 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800160 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800162 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800163 else err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 } else {
165 struct nameidata nd;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 err = path_lookup(buf, 0, &nd);
167 if (err)
168 goto out;
169
170 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800171 key.ek_path = nd.path;
172
NeilBrown8d270f7f2006-03-27 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);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800176 else
177 err = -ENOMEM;
Jan Blunck1d957f92008-02-14 19:34:35 -0800178 path_put(&nd.path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
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, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800207 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208 }
209 seq_printf(m, "\n");
210 return 0;
211}
NeilBrown8d270f7f2006-03-27 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));
NeilBrown8d270f7f2006-03-27 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
Jan Bluncke83aece2008-02-14 19:38:41 -0800244 new->ek_path = item->ek_path;
245 path_get(&item->ek_path);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800246}
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,
NeilBrown8d270f7f2006-03-27 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
NeilBrown8d270f7f2006-03-27 01:15:04 -0800272static struct svc_expkey *
273svc_expkey_lookup(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
NeilBrown8d270f7f2006-03-27 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
NeilBrown8d270f7f2006-03-27 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{
NeilBrown8d270f7f2006-03-27 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);
Jan Blunck54775492008-02-14 19:38:39 -0800333 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800334 auth_domain_put(exp->ex_client);
Jan Blunck54775492008-02-14 19:38:39 -0800335 kfree(exp->ex_pathname);
Manoj Naik933469192006-10-04 02:16:18 -0700336 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800337 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338}
339
340static void svc_export_request(struct cache_detail *cd,
341 struct cache_head *h,
342 char **bpp, int *blen)
343{
344 /* client path */
345 struct svc_export *exp = container_of(h, struct svc_export, h);
346 char *pth;
347
348 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunckcf28b482008-02-14 19:38:44 -0800349 pth = d_path(&exp->ex_path, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 if (IS_ERR(pth)) {
351 /* is this correct? */
352 (*bpp)[0] = '\n';
353 return;
354 }
355 qword_add(bpp, blen, pth);
356 (*bpp)[-1] = '\n';
357}
358
Adrian Bunk74cae612006-03-27 01:15:10 -0800359static struct svc_export *svc_export_update(struct svc_export *new,
360 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800361static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362
NeilBrownaf6a4e22007-02-14 00:33:12 -0800363static int check_export(struct inode *inode, int flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364{
365
366 /* We currently export only dirs and regular files.
367 * This is what umountd does.
368 */
369 if (!S_ISDIR(inode->i_mode) &&
370 !S_ISREG(inode->i_mode))
371 return -ENOTDIR;
372
373 /* There are two requirements on a filesystem to be exportable.
374 * 1: We must be able to identify the filesystem from a number.
375 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800376 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 * 2: We must be able to find an inode from a filehandle.
378 * This means that s_export_op must be set.
379 */
380 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800381 !(flags & NFSEXP_FSID) &&
382 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700383 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 return -EINVAL;
385 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700386
387 if (!inode->i_sb->s_export_op ||
388 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 dprintk("exp_export: export of invalid fs type.\n");
390 return -EINVAL;
391 }
392
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 return 0;
394
395}
396
Manoj Naik933469192006-10-04 02:16:18 -0700397#ifdef CONFIG_NFSD_V4
398
399static int
400fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
401{
402 int len;
403 int migrated, i, err;
404
Manoj Naik933469192006-10-04 02:16:18 -0700405 /* listsize */
406 err = get_int(mesg, &fsloc->locations_count);
407 if (err)
408 return err;
409 if (fsloc->locations_count > MAX_FS_LOCATIONS)
410 return -EINVAL;
411 if (fsloc->locations_count == 0)
412 return 0;
413
414 fsloc->locations = kzalloc(fsloc->locations_count
415 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
416 if (!fsloc->locations)
417 return -ENOMEM;
418 for (i=0; i < fsloc->locations_count; i++) {
419 /* colon separated host list */
420 err = -EINVAL;
421 len = qword_get(mesg, buf, PAGE_SIZE);
422 if (len <= 0)
423 goto out_free_all;
424 err = -ENOMEM;
425 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
426 if (!fsloc->locations[i].hosts)
427 goto out_free_all;
428 err = -EINVAL;
429 /* slash separated path component list */
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].path)
436 goto out_free_all;
437 }
438 /* migrated */
439 err = get_int(mesg, &migrated);
440 if (err)
441 goto out_free_all;
442 err = -EINVAL;
443 if (migrated < 0 || migrated > 1)
444 goto out_free_all;
445 fsloc->migrated = migrated;
446 return 0;
447out_free_all:
448 nfsd4_fslocs_free(fsloc);
449 return err;
450}
451
Andy Adamsone677bfe2007-07-17 04:04:42 -0700452static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
453{
454 int listsize, err;
455 struct exp_flavor_info *f;
456
457 err = get_int(mesg, &listsize);
458 if (err)
459 return err;
460 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
461 return -EINVAL;
462
463 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
464 err = get_int(mesg, &f->pseudoflavor);
465 if (err)
466 return err;
467 /*
468 * Just a quick sanity check; we could also try to check
469 * whether this pseudoflavor is supported, but at worst
470 * an unsupported pseudoflavor on the export would just
471 * be a pseudoflavor that won't match the flavor of any
472 * authenticated request. The administrator will
473 * probably discover the problem when someone fails to
474 * authenticate.
475 */
476 if (f->pseudoflavor < 0)
477 return -EINVAL;
478 err = get_int(mesg, &f->flags);
479 if (err)
480 return err;
481 /* Only some flags are allowed to differ between flavors: */
482 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
483 return -EINVAL;
484 }
485 exp->ex_nflavors = listsize;
486 return 0;
487}
488
Manoj Naik933469192006-10-04 02:16:18 -0700489#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700490static inline int
491fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
492static inline int
493secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik933469192006-10-04 02:16:18 -0700494#endif
495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
497{
498 /* client path expiry [flags anonuid anongid fsid] */
499 char *buf;
500 int len;
501 int err;
502 struct auth_domain *dom = NULL;
503 struct nameidata nd;
504 struct svc_export exp, *expp;
505 int an_int;
506
Jan Blunck4ac91372008-02-14 19:34:32 -0800507 nd.path.dentry = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800508 exp.ex_pathname = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
NeilBrown402acd22007-05-09 02:34:52 -0700510 /* fs locations */
511 exp.ex_fslocs.locations = NULL;
512 exp.ex_fslocs.locations_count = 0;
513 exp.ex_fslocs.migrated = 0;
514
515 exp.ex_uuid = NULL;
516
Andy Adamsone677bfe2007-07-17 04:04:42 -0700517 /* secinfo */
518 exp.ex_nflavors = 0;
519
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (mesg[mlen-1] != '\n')
521 return -EINVAL;
522 mesg[mlen-1] = 0;
523
524 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
525 err = -ENOMEM;
526 if (!buf) goto out;
527
528 /* client */
529 len = qword_get(&mesg, buf, PAGE_SIZE);
530 err = -EINVAL;
531 if (len <= 0) goto out;
532
533 err = -ENOENT;
534 dom = auth_domain_find(buf);
535 if (!dom)
536 goto out;
537
538 /* path */
539 err = -EINVAL;
540 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
541 goto out;
542 err = path_lookup(buf, 0, &nd);
NeilBrowncd156542006-04-10 22:55:27 -0700543 if (err) goto out_no_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544
545 exp.h.flags = 0;
546 exp.ex_client = dom;
Jan Blunck54775492008-02-14 19:38:39 -0800547 exp.ex_path.mnt = nd.path.mnt;
548 exp.ex_path.dentry = nd.path.dentry;
549 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700550 err = -ENOMEM;
Jan Blunck54775492008-02-14 19:38:39 -0800551 if (!exp.ex_pathname)
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700552 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553
554 /* expiry */
555 err = -EINVAL;
556 exp.h.expiry_time = get_expiry(&mesg);
557 if (exp.h.expiry_time == 0)
558 goto out;
559
560 /* flags */
561 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700562 if (err == -ENOENT) {
563 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700565 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (err || an_int < 0) goto out;
567 exp.ex_flags= an_int;
568
569 /* anon uid */
570 err = get_int(&mesg, &an_int);
571 if (err) goto out;
572 exp.ex_anon_uid= an_int;
573
574 /* anon gid */
575 err = get_int(&mesg, &an_int);
576 if (err) goto out;
577 exp.ex_anon_gid= an_int;
578
579 /* fsid */
580 err = get_int(&mesg, &an_int);
581 if (err) goto out;
582 exp.ex_fsid = an_int;
583
NeilBrownaf6a4e22007-02-14 00:33:12 -0800584 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
585 if (strcmp(buf, "fsloc") == 0)
586 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
587 else if (strcmp(buf, "uuid") == 0) {
588 /* expect a 16 byte uuid encoded as \xXXXX... */
589 len = qword_get(&mesg, buf, PAGE_SIZE);
590 if (len != 16)
591 err = -EINVAL;
592 else {
593 exp.ex_uuid =
594 kmemdup(buf, 16, GFP_KERNEL);
595 if (exp.ex_uuid == NULL)
596 err = -ENOMEM;
597 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700598 } else if (strcmp(buf, "secinfo") == 0)
599 err = secinfo_parse(&mesg, buf, &exp);
600 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800601 /* quietly ignore unknown words and anything
602 * following. Newer user-space can try to set
603 * new values, then see what the result was.
604 */
605 break;
606 if (err)
607 goto out;
608 }
Manoj Naik933469192006-10-04 02:16:18 -0700609
Jan Blunck4ac91372008-02-14 19:34:32 -0800610 err = check_export(nd.path.dentry->d_inode, exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800611 exp.ex_uuid);
612 if (err) goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 }
614
NeilBrown4f7774c2006-03-27 01:15:03 -0800615 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800617 expp = svc_export_update(&exp, expp);
618 else
619 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800621 if (expp == NULL)
622 err = -ENOMEM;
623 else
624 exp_put(expp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 out:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800626 nfsd4_fslocs_free(&exp.ex_fslocs);
627 kfree(exp.ex_uuid);
Jan Blunck54775492008-02-14 19:38:39 -0800628 kfree(exp.ex_pathname);
Jan Blunck4ac91372008-02-14 19:34:32 -0800629 if (nd.path.dentry)
Jan Blunck1d957f92008-02-14 19:34:35 -0800630 path_put(&nd.path);
NeilBrowncd156542006-04-10 22:55:27 -0700631 out_no_path:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 if (dom)
633 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800634 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635 return err;
636}
637
Manoj Naik933469192006-10-04 02:16:18 -0700638static void exp_flags(struct seq_file *m, int flag, int fsid,
639 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700640static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642static int svc_export_show(struct seq_file *m,
643 struct cache_detail *cd,
644 struct cache_head *h)
645{
646 struct svc_export *exp ;
647
648 if (h ==NULL) {
649 seq_puts(m, "#path domain(flags)\n");
650 return 0;
651 }
652 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800653 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 seq_putc(m, '\t');
655 seq_escape(m, exp->ex_client->name, " \t\n\\");
656 seq_putc(m, '(');
657 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800658 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700659 exp_flags(m, exp->ex_flags, exp->ex_fsid,
660 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800661 if (exp->ex_uuid) {
662 int i;
663 seq_puts(m, ",uuid=");
664 for (i=0; i<16; i++) {
665 if ((i&3) == 0 && i)
666 seq_putc(m, ':');
667 seq_printf(m, "%02x", exp->ex_uuid[i]);
668 }
669 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700670 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800671 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700672 seq_puts(m, ")\n");
673 return 0;
674}
NeilBrown4f7774c2006-03-27 01:15:03 -0800675static int svc_export_match(struct cache_head *a, struct cache_head *b)
676{
677 struct svc_export *orig = container_of(a, struct svc_export, h);
678 struct svc_export *new = container_of(b, struct svc_export, h);
679 return orig->ex_client == new->ex_client &&
Jan Blunck54775492008-02-14 19:38:39 -0800680 orig->ex_path.dentry == new->ex_path.dentry &&
681 orig->ex_path.mnt == new->ex_path.mnt;
NeilBrown4f7774c2006-03-27 01:15:03 -0800682}
683
684static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
685{
686 struct svc_export *new = container_of(cnew, struct svc_export, h);
687 struct svc_export *item = container_of(citem, struct svc_export, h);
688
689 kref_get(&item->ex_client->ref);
690 new->ex_client = item->ex_client;
Jan Blunck54775492008-02-14 19:38:39 -0800691 new->ex_path.dentry = dget(item->ex_path.dentry);
692 new->ex_path.mnt = mntget(item->ex_path.mnt);
693 new->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700694 new->ex_fslocs.locations = NULL;
695 new->ex_fslocs.locations_count = 0;
696 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800697}
698
699static void export_update(struct cache_head *cnew, struct cache_head *citem)
700{
701 struct svc_export *new = container_of(cnew, struct svc_export, h);
702 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700703 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800704
705 new->ex_flags = item->ex_flags;
706 new->ex_anon_uid = item->ex_anon_uid;
707 new->ex_anon_gid = item->ex_anon_gid;
708 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800709 new->ex_uuid = item->ex_uuid;
710 item->ex_uuid = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800711 new->ex_pathname = item->ex_pathname;
712 item->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700713 new->ex_fslocs.locations = item->ex_fslocs.locations;
714 item->ex_fslocs.locations = NULL;
715 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
716 item->ex_fslocs.locations_count = 0;
717 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
718 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700719 new->ex_nflavors = item->ex_nflavors;
720 for (i = 0; i < MAX_SECINFO_LIST; i++) {
721 new->ex_flavors[i] = item->ex_flavors[i];
722 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800723}
724
725static struct cache_head *svc_export_alloc(void)
726{
727 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
728 if (i)
729 return &i->h;
730 else
731 return NULL;
732}
733
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700735 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736 .hash_size = EXPORT_HASHMAX,
737 .hash_table = export_table,
738 .name = "nfsd.export",
739 .cache_put = svc_export_put,
740 .cache_request = svc_export_request,
741 .cache_parse = svc_export_parse,
742 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800743 .match = svc_export_match,
744 .init = svc_export_init,
745 .update = export_update,
746 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700747};
748
NeilBrown4f7774c2006-03-27 01:15:03 -0800749static struct svc_export *
750svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
NeilBrown4f7774c2006-03-27 01:15:03 -0800752 struct cache_head *ch;
753 int hash;
754 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
Jan Blunck54775492008-02-14 19:38:39 -0800755 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
756 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
NeilBrown4f7774c2006-03-27 01:15:03 -0800757
758 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
759 hash);
760 if (ch)
761 return container_of(ch, struct svc_export, h);
762 else
763 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764}
765
Adrian Bunk74cae612006-03-27 01:15:10 -0800766static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800767svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768{
NeilBrown4f7774c2006-03-27 01:15:03 -0800769 struct cache_head *ch;
770 int hash;
771 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
Jan Blunck54775492008-02-14 19:38:39 -0800772 hash ^= hash_ptr(old->ex_path.dentry, EXPORT_HASHBITS);
773 hash ^= hash_ptr(old->ex_path.mnt, EXPORT_HASHBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774
NeilBrown4f7774c2006-03-27 01:15:03 -0800775 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
776 &old->h,
777 hash);
778 if (ch)
779 return container_of(ch, struct svc_export, h);
780 else
781 return NULL;
782}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783
784
Adrian Bunk74cae612006-03-27 01:15:10 -0800785static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
787{
788 struct svc_expkey key, *ek;
789 int err;
790
791 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700792 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
794 key.ek_client = clp;
795 key.ek_fsidtype = fsid_type;
796 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
797
NeilBrown8d270f7f2006-03-27 01:15:04 -0800798 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700799 if (ek == NULL)
800 return ERR_PTR(-ENOMEM);
801 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
802 if (err)
803 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 return ek;
805}
806
807static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
808 struct svc_export *exp)
809{
810 struct svc_expkey key, *ek;
811
812 key.ek_client = clp;
813 key.ek_fsidtype = fsid_type;
814 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
Jan Bluncke83aece2008-02-14 19:38:41 -0800815 key.ek_path = exp->ex_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 key.h.expiry_time = NEVER;
817 key.h.flags = 0;
818
NeilBrown8d270f7f2006-03-27 01:15:04 -0800819 ek = svc_expkey_lookup(&key);
820 if (ek)
821 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800823 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 return 0;
825 }
826 return -ENOMEM;
827}
828
829/*
830 * Find the client's export entry matching xdev/xino.
831 */
832static inline struct svc_expkey *
833exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
834{
835 u32 fsidv[3];
836
837 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800838 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
839 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800841 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
842 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843}
844
845/*
846 * Find the client's export entry matching fsid
847 */
848static inline struct svc_expkey *
849exp_get_fsid_key(svc_client *clp, int fsid)
850{
851 u32 fsidv[2];
852
NeilBrownaf6a4e22007-02-14 00:33:12 -0800853 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
NeilBrownaf6a4e22007-02-14 00:33:12 -0800855 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856}
857
Adrian Bunkcce76f92007-10-16 01:27:52 -0700858static svc_export *exp_get_by_name(svc_client *clp, struct vfsmount *mnt,
859 struct dentry *dentry,
860 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861{
862 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700863 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800864
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700866 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
868 key.ex_client = clp;
Jan Blunck54775492008-02-14 19:38:39 -0800869 key.ex_path.mnt = mnt;
870 key.ex_path.dentry = dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
NeilBrown4f7774c2006-03-27 01:15:03 -0800872 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700873 if (exp == NULL)
874 return ERR_PTR(-ENOMEM);
875 err = cache_check(&svc_export_cache, &exp->h, reqp);
876 if (err)
877 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878 return exp;
879}
880
881/*
882 * Find the export entry for a given dentry.
883 */
Adrian Bunkcce76f92007-10-16 01:27:52 -0700884static struct svc_export *exp_parent(svc_client *clp, struct vfsmount *mnt,
885 struct dentry *dentry,
886 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700887{
888 svc_export *exp;
889
890 dget(dentry);
891 exp = exp_get_by_name(clp, mnt, dentry, reqp);
892
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700893 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 struct dentry *parent;
895
896 parent = dget_parent(dentry);
897 dput(dentry);
898 dentry = parent;
899 exp = exp_get_by_name(clp, mnt, dentry, reqp);
900 }
901 dput(dentry);
902 return exp;
903}
904
905/*
906 * Hashtable locking. Write locks are placed only by user processes
907 * wanting to modify export information.
908 * Write locking only done in this file. Read locking
909 * needed externally.
910 */
911
912static DECLARE_RWSEM(hash_sem);
913
914void
915exp_readlock(void)
916{
917 down_read(&hash_sem);
918}
919
920static inline void
921exp_writelock(void)
922{
923 down_write(&hash_sem);
924}
925
926void
927exp_readunlock(void)
928{
929 up_read(&hash_sem);
930}
931
932static inline void
933exp_writeunlock(void)
934{
935 up_write(&hash_sem);
936}
937
938static void exp_fsid_unhash(struct svc_export *exp)
939{
940 struct svc_expkey *ek;
941
942 if ((exp->ex_flags & NFSEXP_FSID) == 0)
943 return;
944
945 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700946 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800948 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700949 }
950 svc_expkey_cache.nextcheck = get_seconds();
951}
952
953static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
954{
955 u32 fsid[2];
956
957 if ((exp->ex_flags & NFSEXP_FSID) == 0)
958 return 0;
959
NeilBrownaf6a4e22007-02-14 00:33:12 -0800960 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
961 return exp_set_key(clp, FSID_NUM, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962}
963
964static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
965{
966 u32 fsid[2];
Jan Blunck54775492008-02-14 19:38:39 -0800967 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968 dev_t dev = inode->i_sb->s_dev;
969
970 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800971 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
972 return exp_set_key(clp, FSID_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800974 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
975 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976}
977
978static void exp_unhash(struct svc_export *exp)
979{
980 struct svc_expkey *ek;
Jan Blunck54775492008-02-14 19:38:39 -0800981 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982
983 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700984 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800986 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 }
988 svc_expkey_cache.nextcheck = get_seconds();
989}
990
991/*
992 * Export a file system.
993 */
994int
995exp_export(struct nfsctl_export *nxp)
996{
997 svc_client *clp;
998 struct svc_export *exp = NULL;
999 struct svc_export new;
1000 struct svc_expkey *fsid_key = NULL;
1001 struct nameidata nd;
1002 int err;
1003
1004 /* Consistency check */
1005 err = -EINVAL;
1006 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1007 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1008 goto out;
1009
1010 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1011 nxp->ex_client, nxp->ex_path,
1012 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1013 nxp->ex_flags);
1014
1015 /* Try to lock the export table for update */
1016 exp_writelock();
1017
1018 /* Look up client info */
1019 if (!(clp = auth_domain_find(nxp->ex_client)))
1020 goto out_unlock;
1021
1022
1023 /* Look up the dentry */
1024 err = path_lookup(nxp->ex_path, 0, &nd);
1025 if (err)
1026 goto out_unlock;
1027 err = -EINVAL;
1028
Jan Blunck4ac91372008-02-14 19:34:32 -08001029 exp = exp_get_by_name(clp, nd.path.mnt, nd.path.dentry, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030
NeilBrownf9884432006-12-13 00:35:45 -08001031 memset(&new, 0, sizeof(new));
1032
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 /* must make sure there won't be an ex_fsid clash */
1034 if ((nxp->ex_flags & NFSEXP_FSID) &&
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001035 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
Jan Bluncke83aece2008-02-14 19:38:41 -08001036 fsid_key->ek_path.mnt &&
1037 (fsid_key->ek_path.mnt != nd.path.mnt ||
1038 fsid_key->ek_path.dentry != nd.path.dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 goto finish;
1040
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001041 if (!IS_ERR(exp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042 /* just a flags/id/fsid update */
1043
1044 exp_fsid_unhash(exp);
1045 exp->ex_flags = nxp->ex_flags;
1046 exp->ex_anon_uid = nxp->ex_anon_uid;
1047 exp->ex_anon_gid = nxp->ex_anon_gid;
1048 exp->ex_fsid = nxp->ex_dev;
1049
1050 err = exp_fsid_hash(clp, exp);
1051 goto finish;
1052 }
1053
Jan Blunck4ac91372008-02-14 19:34:32 -08001054 err = check_export(nd.path.dentry->d_inode, nxp->ex_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001055 if (err) goto finish;
1056
1057 err = -ENOMEM;
1058
1059 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1060
1061 new.h.expiry_time = NEVER;
1062 new.h.flags = 0;
Jan Blunck54775492008-02-14 19:38:39 -08001063 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1064 if (!new.ex_pathname)
NeilBrownf9884432006-12-13 00:35:45 -08001065 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 new.ex_client = clp;
Jan Blunck54775492008-02-14 19:38:39 -08001067 new.ex_path = nd.path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 new.ex_flags = nxp->ex_flags;
1069 new.ex_anon_uid = nxp->ex_anon_uid;
1070 new.ex_anon_gid = nxp->ex_anon_gid;
1071 new.ex_fsid = nxp->ex_dev;
1072
NeilBrown4f7774c2006-03-27 01:15:03 -08001073 exp = svc_export_lookup(&new);
1074 if (exp)
1075 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001076
NeilBrown4f7774c2006-03-27 01:15:03 -08001077 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078 goto finish;
1079
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 if (exp_hash(clp, exp) ||
1081 exp_fsid_hash(clp, exp)) {
1082 /* failed to create at least one index */
1083 exp_do_unexport(exp);
1084 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001085 } else
1086 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087finish:
Jan Blunck54775492008-02-14 19:38:39 -08001088 kfree(new.ex_pathname);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 if (exp)
1090 exp_put(exp);
1091 if (fsid_key && !IS_ERR(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001092 cache_put(&fsid_key->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 if (clp)
1094 auth_domain_put(clp);
Jan Blunck1d957f92008-02-14 19:34:35 -08001095 path_put(&nd.path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001096out_unlock:
1097 exp_writeunlock();
1098out:
1099 return err;
1100}
1101
1102/*
1103 * Unexport a file system. The export entry has already
1104 * been removed from the client's list of exported fs's.
1105 */
1106static void
1107exp_do_unexport(svc_export *unexp)
1108{
1109 unexp->h.expiry_time = get_seconds()-1;
1110 svc_export_cache.nextcheck = get_seconds();
1111 exp_unhash(unexp);
1112 exp_fsid_unhash(unexp);
1113}
1114
1115
1116/*
1117 * unexport syscall.
1118 */
1119int
1120exp_unexport(struct nfsctl_export *nxp)
1121{
1122 struct auth_domain *dom;
1123 svc_export *exp;
1124 struct nameidata nd;
1125 int err;
1126
1127 /* Consistency check */
1128 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1129 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1130 return -EINVAL;
1131
1132 exp_writelock();
1133
1134 err = -EINVAL;
1135 dom = auth_domain_find(nxp->ex_client);
1136 if (!dom) {
1137 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1138 goto out_unlock;
1139 }
1140
1141 err = path_lookup(nxp->ex_path, 0, &nd);
1142 if (err)
1143 goto out_domain;
1144
1145 err = -EINVAL;
Jan Blunck4ac91372008-02-14 19:34:32 -08001146 exp = exp_get_by_name(dom, nd.path.mnt, nd.path.dentry, NULL);
Jan Blunck1d957f92008-02-14 19:34:35 -08001147 path_put(&nd.path);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001148 if (IS_ERR(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 goto out_domain;
1150
1151 exp_do_unexport(exp);
1152 exp_put(exp);
1153 err = 0;
1154
1155out_domain:
1156 auth_domain_put(dom);
1157 cache_flush();
1158out_unlock:
1159 exp_writeunlock();
1160 return err;
1161}
1162
1163/*
1164 * Obtain the root fh on behalf of a client.
1165 * This could be done in user space, but I feel that it adds some safety
1166 * since its harder to fool a kernel module than a user space program.
1167 */
1168int
1169exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1170{
1171 struct svc_export *exp;
1172 struct nameidata nd;
1173 struct inode *inode;
1174 struct svc_fh fh;
1175 int err;
1176
1177 err = -EPERM;
1178 /* NB: we probably ought to check that it's NUL-terminated */
1179 if (path_lookup(path, 0, &nd)) {
1180 printk("nfsd: exp_rootfh path not found %s", path);
1181 return err;
1182 }
Jan Blunck4ac91372008-02-14 19:34:32 -08001183 inode = nd.path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
1185 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Jan Blunck4ac91372008-02-14 19:34:32 -08001186 path, nd.path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001187 inode->i_sb->s_id, inode->i_ino);
Jan Blunck4ac91372008-02-14 19:34:32 -08001188 exp = exp_parent(clp, nd.path.mnt, nd.path.dentry, NULL);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001189 if (IS_ERR(exp)) {
1190 err = PTR_ERR(exp);
1191 goto out;
1192 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001193
1194 /*
1195 * fh must be initialized before calling fh_compose
1196 */
1197 fh_init(&fh, maxsize);
Jan Blunck4ac91372008-02-14 19:34:32 -08001198 if (fh_compose(&fh, exp, nd.path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 err = -EINVAL;
1200 else
1201 err = 0;
1202 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1203 fh_put(&fh);
1204 exp_put(exp);
1205out:
Jan Blunck1d957f92008-02-14 19:34:35 -08001206 path_put(&nd.path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 return err;
1208}
1209
Adrian Bunkcce76f92007-10-16 01:27:52 -07001210static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1211 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -08001212{
1213 struct svc_export *exp;
1214 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001215 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -08001216 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001217
Jan Bluncke83aece2008-02-14 19:38:41 -08001218 exp = exp_get_by_name(clp, ek->ek_path.mnt, ek->ek_path.dentry, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001219 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001220
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001221 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -08001222 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001223 return exp;
1224}
1225
Andy Adamson32c1eb02007-07-17 04:04:48 -07001226__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1227{
1228 struct exp_flavor_info *f;
1229 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1230
1231 /* legacy gss-only clients are always OK: */
1232 if (exp->ex_client == rqstp->rq_gssclient)
1233 return 0;
1234 /* ip-address based client; check sec= export option: */
1235 for (f = exp->ex_flavors; f < end; f++) {
1236 if (f->pseudoflavor == rqstp->rq_flavor)
1237 return 0;
1238 }
1239 /* defaults in absence of sec= options: */
1240 if (exp->ex_nflavors == 0) {
1241 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1242 rqstp->rq_flavor == RPC_AUTH_UNIX)
1243 return 0;
1244 }
1245 return nfserr_wrongsec;
1246}
1247
J. Bruce Fields0989a782007-07-17 04:04:44 -07001248/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001249 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1250 * auth_unix client) if it's available and has secinfo information;
1251 * otherwise, will try to use rq_gssclient.
1252 *
J. Bruce Fields0989a782007-07-17 04:04:44 -07001253 * Called from functions that handle requests; functions that do work on
1254 * behalf of mountd are passed a single client name to use, and should
1255 * use exp_get_by_name() or exp_find().
1256 */
1257struct svc_export *
1258rqst_exp_get_by_name(struct svc_rqst *rqstp, struct vfsmount *mnt,
1259 struct dentry *dentry)
1260{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001261 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001262
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001263 if (rqstp->rq_client == NULL)
1264 goto gss;
1265
1266 /* First try the auth_unix client: */
1267 exp = exp_get_by_name(rqstp->rq_client, mnt, dentry,
1268 &rqstp->rq_chandle);
1269 if (PTR_ERR(exp) == -ENOENT)
1270 goto gss;
1271 if (IS_ERR(exp))
1272 return exp;
1273 /* If it has secinfo, assume there are no gss/... clients */
1274 if (exp->ex_nflavors > 0)
1275 return exp;
1276gss:
1277 /* Otherwise, try falling back on gss client */
1278 if (rqstp->rq_gssclient == NULL)
1279 return exp;
1280 gssexp = exp_get_by_name(rqstp->rq_gssclient, mnt, dentry,
1281 &rqstp->rq_chandle);
1282 if (PTR_ERR(gssexp) == -ENOENT)
1283 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001284 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001285 exp_put(exp);
1286 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001287}
1288
1289struct svc_export *
1290rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1291{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001292 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001293
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001294 if (rqstp->rq_client == NULL)
1295 goto gss;
1296
1297 /* First try the auth_unix client: */
1298 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1299 if (PTR_ERR(exp) == -ENOENT)
1300 goto gss;
1301 if (IS_ERR(exp))
1302 return exp;
1303 /* If it has secinfo, assume there are no gss/... clients */
1304 if (exp->ex_nflavors > 0)
1305 return exp;
1306gss:
1307 /* Otherwise, try falling back on gss client */
1308 if (rqstp->rq_gssclient == NULL)
1309 return exp;
1310 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1311 &rqstp->rq_chandle);
1312 if (PTR_ERR(gssexp) == -ENOENT)
1313 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001314 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001315 exp_put(exp);
1316 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001317}
1318
1319struct svc_export *
1320rqst_exp_parent(struct svc_rqst *rqstp, struct vfsmount *mnt,
1321 struct dentry *dentry)
1322{
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001323 struct svc_export *exp;
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001324
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001325 dget(dentry);
1326 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1327
1328 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) {
1329 struct dentry *parent;
1330
1331 parent = dget_parent(dentry);
1332 dput(dentry);
1333 dentry = parent;
1334 exp = rqst_exp_get_by_name(rqstp, mnt, dentry);
1335 }
1336 dput(dentry);
1337 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001338}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001339
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340/*
1341 * Called when we need the filehandle for the root of the pseudofs,
1342 * for a given NFSv4 client. The root is defined to be the
1343 * export point with fsid==0
1344 */
Al Viroc7afef12006-10-19 23:29:02 -07001345__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001346exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001347{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001348 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001349 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350 u32 fsidv[2];
1351
NeilBrownaf6a4e22007-02-14 00:33:12 -08001352 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
J. Bruce Fields0989a782007-07-17 04:04:44 -07001354 exp = rqst_exp_find(rqstp, FSID_NUM, fsidv);
J.Bruce Fields68993202006-12-13 00:35:23 -08001355 if (IS_ERR(exp))
1356 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001357 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001358 if (rv)
1359 goto out;
1360 rv = check_nfsd_access(exp, rqstp);
1361out:
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001362 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001363 return rv;
1364}
1365
1366/* Iterator */
1367
1368static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001369 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370{
1371 loff_t n = *pos;
1372 unsigned hash, export;
1373 struct cache_head *ch;
1374
1375 exp_readlock();
1376 read_lock(&svc_export_cache.hash_lock);
1377 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001378 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 hash = n >> 32;
1380 export = n & ((1LL<<32) - 1);
1381
1382
1383 for (ch=export_table[hash]; ch; ch=ch->next)
1384 if (!export--)
1385 return ch;
1386 n &= ~((1LL<<32) - 1);
1387 do {
1388 hash++;
1389 n += 1LL<<32;
1390 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1391 if (hash >= EXPORT_HASHMAX)
1392 return NULL;
1393 *pos = n+1;
1394 return export_table[hash];
1395}
1396
1397static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1398{
1399 struct cache_head *ch = p;
1400 int hash = (*pos >> 32);
1401
Greg Banksbc6f02e2006-10-02 02:17:49 -07001402 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001403 hash = 0;
1404 else if (ch->next == NULL) {
1405 hash++;
1406 *pos += 1LL<<32;
1407 } else {
1408 ++*pos;
1409 return ch->next;
1410 }
1411 *pos &= ~((1LL<<32) - 1);
1412 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1413 hash++;
1414 *pos += 1LL<<32;
1415 }
1416 if (hash >= EXPORT_HASHMAX)
1417 return NULL;
1418 ++*pos;
1419 return export_table[hash];
1420}
1421
1422static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001423 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424{
1425 read_unlock(&svc_export_cache.hash_lock);
1426 exp_readunlock();
1427}
1428
1429static struct flags {
1430 int flag;
1431 char *name[2];
1432} expflags[] = {
1433 { NFSEXP_READONLY, {"ro", "rw"}},
1434 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1435 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1436 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1437 { NFSEXP_ASYNC, {"async", "sync"}},
1438 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1439 { NFSEXP_NOHIDE, {"nohide", ""}},
1440 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1441 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1442 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1443#ifdef MSNFS
1444 { NFSEXP_MSNFS, {"msnfs", ""}},
1445#endif
1446 { 0, {"", ""}}
1447};
1448
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001449static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001452 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
1454 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001455 if (flg->flag & ~mask)
1456 continue;
1457 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 if (*flg->name[state])
1459 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1460 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001461}
1462
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001463static void show_secinfo_flags(struct seq_file *m, int flags)
1464{
1465 seq_printf(m, ",");
1466 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1467}
1468
1469static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1470{
1471 struct exp_flavor_info *f;
1472 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1473 int lastflags = 0, first = 0;
1474
1475 if (exp->ex_nflavors == 0)
1476 return;
1477 for (f = exp->ex_flavors; f < end; f++) {
1478 if (first || f->flags != lastflags) {
1479 if (!first)
1480 show_secinfo_flags(m, lastflags);
1481 seq_printf(m, ",sec=%d", f->pseudoflavor);
1482 lastflags = f->flags;
1483 } else {
1484 seq_printf(m, ":%d", f->pseudoflavor);
1485 }
1486 }
1487 show_secinfo_flags(m, lastflags);
1488}
1489
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001490static void exp_flags(struct seq_file *m, int flag, int fsid,
1491 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1492{
1493 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001495 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001497 seq_printf(m, ",anonuid=%u", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001498 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001499 seq_printf(m, ",anongid=%u", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001500 if (fsloc && fsloc->locations_count > 0) {
1501 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1502 int i;
1503
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001504 seq_printf(m, ",%s=", loctype);
Manoj Naik933469192006-10-04 02:16:18 -07001505 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1506 seq_putc(m, '@');
1507 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1508 for (i = 1; i < fsloc->locations_count; i++) {
1509 seq_putc(m, ';');
1510 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1511 seq_putc(m, '@');
1512 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1513 }
1514 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001515}
1516
1517static int e_show(struct seq_file *m, void *p)
1518{
1519 struct cache_head *cp = p;
1520 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
Greg Banksbc6f02e2006-10-02 02:17:49 -07001522 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001523 seq_puts(m, "# Version 1.1\n");
1524 seq_puts(m, "# Path Client(Flags) # IPs\n");
1525 return 0;
1526 }
1527
Linus Torvalds1da177e2005-04-16 15:20:36 -07001528 cache_get(&exp->h);
1529 if (cache_check(&svc_export_cache, &exp->h, NULL))
1530 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001531 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 return svc_export_show(m, &svc_export_cache, cp);
1533}
1534
1535struct seq_operations nfs_exports_op = {
1536 .start = e_start,
1537 .next = e_next,
1538 .stop = e_stop,
1539 .show = e_show,
1540};
1541
1542/*
1543 * Add or modify a client.
1544 * Change requests may involve the list of host addresses. The list of
1545 * exports and possibly existing uid maps are left untouched.
1546 */
1547int
1548exp_addclient(struct nfsctl_client *ncp)
1549{
1550 struct auth_domain *dom;
1551 int i, err;
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001552 struct in6_addr addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001553
1554 /* First, consistency check. */
1555 err = -EINVAL;
1556 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1557 goto out;
1558 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1559 goto out;
1560
1561 /* Lock the hashtable */
1562 exp_writelock();
1563
1564 dom = unix_domain_find(ncp->cl_ident);
1565
1566 err = -ENOMEM;
1567 if (!dom)
1568 goto out_unlock;
1569
1570 /* Insert client into hashtable. */
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001571 for (i = 0; i < ncp->cl_naddr; i++) {
1572 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1573 auth_unix_add_addr(&addr6, dom);
1574 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001575 auth_unix_forget_old(dom);
1576 auth_domain_put(dom);
1577
1578 err = 0;
1579
1580out_unlock:
1581 exp_writeunlock();
1582out:
1583 return err;
1584}
1585
1586/*
1587 * Delete a client given an identifier.
1588 */
1589int
1590exp_delclient(struct nfsctl_client *ncp)
1591{
1592 int err;
1593 struct auth_domain *dom;
1594
1595 err = -EINVAL;
1596 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1597 goto out;
1598
1599 /* Lock the hashtable */
1600 exp_writelock();
1601
1602 dom = auth_domain_find(ncp->cl_ident);
1603 /* just make sure that no addresses work
1604 * and that it will expire soon
1605 */
1606 if (dom) {
1607 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001608 auth_domain_put(dom);
1609 }
1610
1611 exp_writeunlock();
1612out:
1613 return err;
1614}
1615
1616/*
1617 * Verify that string is non-empty and does not exceed max length.
1618 */
1619static int
1620exp_verify_string(char *cp, int max)
1621{
1622 int i;
1623
1624 for (i = 0; i < max; i++)
1625 if (!cp[i])
1626 return i;
1627 cp[i] = 0;
1628 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1629 return 0;
1630}
1631
1632/*
1633 * Initialize the exports module.
1634 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001635int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001636nfsd_export_init(void)
1637{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001638 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001639 dprintk("nfsd: initializing export module.\n");
1640
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001641 rv = cache_register(&svc_export_cache);
1642 if (rv)
1643 return rv;
1644 rv = cache_register(&svc_expkey_cache);
1645 if (rv)
1646 cache_unregister(&svc_export_cache);
1647 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001648
1649}
1650
1651/*
1652 * Flush exports table - called when last nfsd thread is killed
1653 */
1654void
1655nfsd_export_flush(void)
1656{
1657 exp_writelock();
1658 cache_purge(&svc_expkey_cache);
1659 cache_purge(&svc_export_cache);
1660 exp_writeunlock();
1661}
1662
1663/*
1664 * Shutdown the exports module.
1665 */
1666void
1667nfsd_export_shutdown(void)
1668{
1669
1670 dprintk("nfsd: shutting down export module.\n");
1671
1672 exp_writelock();
1673
J. Bruce Fieldsdf95a9d2007-11-08 16:09:59 -05001674 cache_unregister(&svc_expkey_cache);
1675 cache_unregister(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001676 svcauth_unix_purge();
1677
1678 exp_writeunlock();
1679 dprintk("nfsd: export shutdown complete.\n");
1680}