blob: 248dd92e6a56de1f0a93334c4093a45384cbc4e7 [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>
19#include <linux/sched.h>
20#include <linux/stat.h>
21#include <linux/in.h>
22#include <linux/seq_file.h>
23#include <linux/syscalls.h>
24#include <linux/rwsem.h>
25#include <linux/dcache.h>
26#include <linux/namei.h>
27#include <linux/mount.h>
28#include <linux/hash.h>
Bruce Allanf35279d2005-09-06 15:17:08 -070029#include <linux/module.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070030
31#include <linux/sunrpc/svc.h>
32#include <linux/nfsd/nfsd.h>
33#include <linux/nfsd/nfsfh.h>
34#include <linux/nfsd/syscall.h>
35#include <linux/lockd/bind.h>
36
37#define NFSDDBG_FACILITY NFSDDBG_EXPORT
38#define NFSD_PARANOIA 1
39
40typedef struct auth_domain svc_client;
41typedef struct svc_export svc_export;
42
43static void exp_do_unexport(svc_export *unexp);
44static int exp_verify_string(char *cp, int max);
45
46/*
47 * We have two caches.
48 * One maps client+vfsmnt+dentry to export options - the export map
49 * The other maps client+filehandle-fragment to export options. - the expkey map
50 *
51 * The export options are actually stored in the first map, and the
52 * second map contains a reference to the entry in the first map.
53 */
54
55#define EXPKEY_HASHBITS 8
56#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
57#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
58static struct cache_head *expkey_table[EXPKEY_HASHMAX];
59
Adrian Bunk74cae612006-03-27 01:15:10 -080060static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070061{
NeilBrownbaab9352006-03-27 01:15:09 -080062 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
63
64 if (test_bit(CACHE_VALID, &key->h.flags) &&
65 !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
66 dput(key->ek_dentry);
67 mntput(key->ek_mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 }
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);
NeilBrowneab7e2e2006-03-27 01:15:00 -0800171 key.ek_mnt = nd.mnt;
172 key.ek_dentry = nd.dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
NeilBrown8d270f7f2006-03-27 01:15:04 -0800174 ek = svc_expkey_update(&key, ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (ek)
NeilBrownbaab9352006-03-27 01:15:09 -0800176 cache_put(&ek->h, &svc_expkey_cache);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800177 else
178 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 path_release(&nd);
180 }
181 cache_flush();
182 out:
183 if (dom)
184 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800185 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 return err;
187}
188
189static int expkey_show(struct seq_file *m,
190 struct cache_detail *cd,
191 struct cache_head *h)
192{
193 struct svc_expkey *ek ;
194
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);
200 seq_printf(m, "%s %d 0x%08x", ek->ek_client->name,
201 ek->ek_fsidtype, ek->ek_fsid[0]);
202 if (ek->ek_fsidtype != 1)
203 seq_printf(m, "%08x", ek->ek_fsid[1]);
204 if (ek->ek_fsidtype == 2)
205 seq_printf(m, "%08x", ek->ek_fsid[2]);
206 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;
236 new->ek_fsid[0] = item->ek_fsid[0];
237 new->ek_fsid[1] = item->ek_fsid[1];
238 new->ek_fsid[2] = item->ek_fsid[2];
239}
240
241static inline void expkey_update(struct cache_head *cnew,
242 struct cache_head *citem)
243{
244 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
245 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
246
247 new->ek_mnt = mntget(item->ek_mnt);
248 new->ek_dentry = dget(item->ek_dentry);
249}
250
251static struct cache_head *expkey_alloc(void)
252{
253 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
254 if (i)
255 return &i->h;
256 else
257 return NULL;
258}
259
Adrian Bunk74cae612006-03-27 01:15:10 -0800260static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700261 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 .hash_size = EXPKEY_HASHMAX,
263 .hash_table = expkey_table,
264 .name = "nfsd.fh",
265 .cache_put = expkey_put,
266 .cache_request = expkey_request,
267 .cache_parse = expkey_parse,
268 .cache_show = expkey_show,
NeilBrown8d270f7f2006-03-27 01:15:04 -0800269 .match = expkey_match,
270 .init = expkey_init,
271 .update = expkey_update,
272 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273};
274
NeilBrown8d270f7f2006-03-27 01:15:04 -0800275static struct svc_expkey *
276svc_expkey_lookup(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800278 struct cache_head *ch;
279 int hash = item->ek_fsidtype;
280 char * cp = (char*)item->ek_fsid;
281 int len = key_len(item->ek_fsidtype);
282
283 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
284 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
285 hash &= EXPKEY_HASHMASK;
286
287 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
288 hash);
289 if (ch)
290 return container_of(ch, struct svc_expkey, h);
291 else
292 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293}
294
NeilBrown8d270f7f2006-03-27 01:15:04 -0800295static struct svc_expkey *
296svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800298 struct cache_head *ch;
299 int hash = new->ek_fsidtype;
300 char * cp = (char*)new->ek_fsid;
301 int len = key_len(new->ek_fsidtype);
302
303 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
304 hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
305 hash &= EXPKEY_HASHMASK;
306
307 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
308 &old->h, hash);
309 if (ch)
310 return container_of(ch, struct svc_expkey, h);
311 else
312 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313}
314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316#define EXPORT_HASHBITS 8
317#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
318#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
319
320static struct cache_head *export_table[EXPORT_HASHMAX];
321
Manoj Naik933469192006-10-04 02:16:18 -0700322static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
323{
324 int i;
325
326 for (i = 0; i < fsloc->locations_count; i++) {
327 kfree(fsloc->locations[i].path);
328 kfree(fsloc->locations[i].hosts);
329 }
330 kfree(fsloc->locations);
331}
332
NeilBrownbaab9352006-03-27 01:15:09 -0800333static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334{
NeilBrownbaab9352006-03-27 01:15:09 -0800335 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
336 dput(exp->ex_dentry);
337 mntput(exp->ex_mnt);
338 auth_domain_put(exp->ex_client);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700339 kfree(exp->ex_path);
Manoj Naik933469192006-10-04 02:16:18 -0700340 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800341 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342}
343
344static void svc_export_request(struct cache_detail *cd,
345 struct cache_head *h,
346 char **bpp, int *blen)
347{
348 /* client path */
349 struct svc_export *exp = container_of(h, struct svc_export, h);
350 char *pth;
351
352 qword_add(bpp, blen, exp->ex_client->name);
353 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
354 if (IS_ERR(pth)) {
355 /* is this correct? */
356 (*bpp)[0] = '\n';
357 return;
358 }
359 qword_add(bpp, blen, pth);
360 (*bpp)[-1] = '\n';
361}
362
Adrian Bunk74cae612006-03-27 01:15:10 -0800363static struct svc_export *svc_export_update(struct svc_export *new,
364 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800365static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367static int check_export(struct inode *inode, int flags)
368{
369
370 /* We currently export only dirs and regular files.
371 * This is what umountd does.
372 */
373 if (!S_ISDIR(inode->i_mode) &&
374 !S_ISREG(inode->i_mode))
375 return -ENOTDIR;
376
377 /* There are two requirements on a filesystem to be exportable.
378 * 1: We must be able to identify the filesystem from a number.
379 * either a device number (so FS_REQUIRES_DEV needed)
380 * or an FSID number (so NFSEXP_FSID needed).
381 * 2: We must be able to find an inode from a filehandle.
382 * This means that s_export_op must be set.
383 */
384 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
385 !(flags & NFSEXP_FSID)) {
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
410 len = qword_get(mesg, buf, PAGE_SIZE);
411 if (len != 5 || memcmp(buf, "fsloc", 5))
412 return 0;
413
414 /* listsize */
415 err = get_int(mesg, &fsloc->locations_count);
416 if (err)
417 return err;
418 if (fsloc->locations_count > MAX_FS_LOCATIONS)
419 return -EINVAL;
420 if (fsloc->locations_count == 0)
421 return 0;
422
423 fsloc->locations = kzalloc(fsloc->locations_count
424 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
425 if (!fsloc->locations)
426 return -ENOMEM;
427 for (i=0; i < fsloc->locations_count; i++) {
428 /* colon separated host list */
429 err = -EINVAL;
430 len = qword_get(mesg, buf, PAGE_SIZE);
431 if (len <= 0)
432 goto out_free_all;
433 err = -ENOMEM;
434 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
435 if (!fsloc->locations[i].hosts)
436 goto out_free_all;
437 err = -EINVAL;
438 /* slash separated path component list */
439 len = qword_get(mesg, buf, PAGE_SIZE);
440 if (len <= 0)
441 goto out_free_all;
442 err = -ENOMEM;
443 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
444 if (!fsloc->locations[i].path)
445 goto out_free_all;
446 }
447 /* migrated */
448 err = get_int(mesg, &migrated);
449 if (err)
450 goto out_free_all;
451 err = -EINVAL;
452 if (migrated < 0 || migrated > 1)
453 goto out_free_all;
454 fsloc->migrated = migrated;
455 return 0;
456out_free_all:
457 nfsd4_fslocs_free(fsloc);
458 return err;
459}
460
461#else /* CONFIG_NFSD_V4 */
462static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; }
463#endif
464
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
466{
467 /* client path expiry [flags anonuid anongid fsid] */
468 char *buf;
469 int len;
470 int err;
471 struct auth_domain *dom = NULL;
472 struct nameidata nd;
473 struct svc_export exp, *expp;
474 int an_int;
475
476 nd.dentry = NULL;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700477 exp.ex_path = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
479 if (mesg[mlen-1] != '\n')
480 return -EINVAL;
481 mesg[mlen-1] = 0;
482
483 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
484 err = -ENOMEM;
485 if (!buf) goto out;
486
487 /* client */
488 len = qword_get(&mesg, buf, PAGE_SIZE);
489 err = -EINVAL;
490 if (len <= 0) goto out;
491
492 err = -ENOENT;
493 dom = auth_domain_find(buf);
494 if (!dom)
495 goto out;
496
497 /* path */
498 err = -EINVAL;
499 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
500 goto out;
501 err = path_lookup(buf, 0, &nd);
NeilBrowncd156542006-04-10 22:55:27 -0700502 if (err) goto out_no_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503
504 exp.h.flags = 0;
505 exp.ex_client = dom;
506 exp.ex_mnt = nd.mnt;
507 exp.ex_dentry = nd.dentry;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700508 exp.ex_path = kstrdup(buf, GFP_KERNEL);
509 err = -ENOMEM;
510 if (!exp.ex_path)
511 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512
513 /* expiry */
514 err = -EINVAL;
515 exp.h.expiry_time = get_expiry(&mesg);
516 if (exp.h.expiry_time == 0)
517 goto out;
518
Manoj Naik933469192006-10-04 02:16:18 -0700519 /* fs locations */
520 exp.ex_fslocs.locations = NULL;
521 exp.ex_fslocs.locations_count = 0;
522 exp.ex_fslocs.migrated = 0;
523
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 /* flags */
525 err = get_int(&mesg, &an_int);
526 if (err == -ENOENT)
527 set_bit(CACHE_NEGATIVE, &exp.h.flags);
528 else {
529 if (err || an_int < 0) goto out;
530 exp.ex_flags= an_int;
531
532 /* anon uid */
533 err = get_int(&mesg, &an_int);
534 if (err) goto out;
535 exp.ex_anon_uid= an_int;
536
537 /* anon gid */
538 err = get_int(&mesg, &an_int);
539 if (err) goto out;
540 exp.ex_anon_gid= an_int;
541
542 /* fsid */
543 err = get_int(&mesg, &an_int);
544 if (err) goto out;
545 exp.ex_fsid = an_int;
546
547 err = check_export(nd.dentry->d_inode, exp.ex_flags);
548 if (err) goto out;
Manoj Naik933469192006-10-04 02:16:18 -0700549
550 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
551 if (err)
552 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554
NeilBrown4f7774c2006-03-27 01:15:03 -0800555 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800557 expp = svc_export_update(&exp, expp);
558 else
559 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800561 if (expp == NULL)
562 err = -ENOMEM;
563 else
564 exp_put(expp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565 out:
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700566 kfree(exp.ex_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 if (nd.dentry)
568 path_release(&nd);
NeilBrowncd156542006-04-10 22:55:27 -0700569 out_no_path:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 if (dom)
571 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800572 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 return err;
574}
575
Manoj Naik933469192006-10-04 02:16:18 -0700576static void exp_flags(struct seq_file *m, int flag, int fsid,
577 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579static int svc_export_show(struct seq_file *m,
580 struct cache_detail *cd,
581 struct cache_head *h)
582{
583 struct svc_export *exp ;
584
585 if (h ==NULL) {
586 seq_puts(m, "#path domain(flags)\n");
587 return 0;
588 }
589 exp = container_of(h, struct svc_export, h);
590 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
591 seq_putc(m, '\t');
592 seq_escape(m, exp->ex_client->name, " \t\n\\");
593 seq_putc(m, '(');
594 if (test_bit(CACHE_VALID, &h->flags) &&
595 !test_bit(CACHE_NEGATIVE, &h->flags))
Manoj Naik933469192006-10-04 02:16:18 -0700596 exp_flags(m, exp->ex_flags, exp->ex_fsid,
597 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 seq_puts(m, ")\n");
599 return 0;
600}
NeilBrown4f7774c2006-03-27 01:15:03 -0800601static int svc_export_match(struct cache_head *a, struct cache_head *b)
602{
603 struct svc_export *orig = container_of(a, struct svc_export, h);
604 struct svc_export *new = container_of(b, struct svc_export, h);
605 return orig->ex_client == new->ex_client &&
606 orig->ex_dentry == new->ex_dentry &&
607 orig->ex_mnt == new->ex_mnt;
608}
609
610static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
611{
612 struct svc_export *new = container_of(cnew, struct svc_export, h);
613 struct svc_export *item = container_of(citem, struct svc_export, h);
614
615 kref_get(&item->ex_client->ref);
616 new->ex_client = item->ex_client;
617 new->ex_dentry = dget(item->ex_dentry);
618 new->ex_mnt = mntget(item->ex_mnt);
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700619 new->ex_path = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700620 new->ex_fslocs.locations = NULL;
621 new->ex_fslocs.locations_count = 0;
622 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800623}
624
625static void export_update(struct cache_head *cnew, struct cache_head *citem)
626{
627 struct svc_export *new = container_of(cnew, struct svc_export, h);
628 struct svc_export *item = container_of(citem, struct svc_export, h);
629
630 new->ex_flags = item->ex_flags;
631 new->ex_anon_uid = item->ex_anon_uid;
632 new->ex_anon_gid = item->ex_anon_gid;
633 new->ex_fsid = item->ex_fsid;
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700634 new->ex_path = item->ex_path;
635 item->ex_path = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700636 new->ex_fslocs.locations = item->ex_fslocs.locations;
637 item->ex_fslocs.locations = NULL;
638 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
639 item->ex_fslocs.locations_count = 0;
640 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
641 item->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800642}
643
644static struct cache_head *svc_export_alloc(void)
645{
646 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
647 if (i)
648 return &i->h;
649 else
650 return NULL;
651}
652
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700654 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 .hash_size = EXPORT_HASHMAX,
656 .hash_table = export_table,
657 .name = "nfsd.export",
658 .cache_put = svc_export_put,
659 .cache_request = svc_export_request,
660 .cache_parse = svc_export_parse,
661 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800662 .match = svc_export_match,
663 .init = svc_export_init,
664 .update = export_update,
665 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700666};
667
NeilBrown4f7774c2006-03-27 01:15:03 -0800668static struct svc_export *
669svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700670{
NeilBrown4f7774c2006-03-27 01:15:03 -0800671 struct cache_head *ch;
672 int hash;
673 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
674 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
675 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
676
677 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
678 hash);
679 if (ch)
680 return container_of(ch, struct svc_export, h);
681 else
682 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683}
684
Adrian Bunk74cae612006-03-27 01:15:10 -0800685static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800686svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687{
NeilBrown4f7774c2006-03-27 01:15:03 -0800688 struct cache_head *ch;
689 int hash;
690 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
691 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
692 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693
NeilBrown4f7774c2006-03-27 01:15:03 -0800694 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
695 &old->h,
696 hash);
697 if (ch)
698 return container_of(ch, struct svc_export, h);
699 else
700 return NULL;
701}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703
Adrian Bunk74cae612006-03-27 01:15:10 -0800704static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
706{
707 struct svc_expkey key, *ek;
708 int err;
709
710 if (!clp)
711 return NULL;
712
713 key.ek_client = clp;
714 key.ek_fsidtype = fsid_type;
715 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
716
NeilBrown8d270f7f2006-03-27 01:15:04 -0800717 ek = svc_expkey_lookup(&key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 if (ek != NULL)
719 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
720 ek = ERR_PTR(err);
721 return ek;
722}
723
724static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
725 struct svc_export *exp)
726{
727 struct svc_expkey key, *ek;
728
729 key.ek_client = clp;
730 key.ek_fsidtype = fsid_type;
731 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
NeilBrowneab7e2e2006-03-27 01:15:00 -0800732 key.ek_mnt = exp->ex_mnt;
733 key.ek_dentry = exp->ex_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 key.h.expiry_time = NEVER;
735 key.h.flags = 0;
736
NeilBrown8d270f7f2006-03-27 01:15:04 -0800737 ek = svc_expkey_lookup(&key);
738 if (ek)
739 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800741 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 return 0;
743 }
744 return -ENOMEM;
745}
746
747/*
748 * Find the client's export entry matching xdev/xino.
749 */
750static inline struct svc_expkey *
751exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
752{
753 u32 fsidv[3];
754
755 if (old_valid_dev(dev)) {
756 mk_fsid_v0(fsidv, dev, ino);
757 return exp_find_key(clp, 0, fsidv, NULL);
758 }
759 mk_fsid_v3(fsidv, dev, ino);
760 return exp_find_key(clp, 3, fsidv, NULL);
761}
762
763/*
764 * Find the client's export entry matching fsid
765 */
766static inline struct svc_expkey *
767exp_get_fsid_key(svc_client *clp, int fsid)
768{
769 u32 fsidv[2];
770
771 mk_fsid_v1(fsidv, fsid);
772
773 return exp_find_key(clp, 1, fsidv, NULL);
774}
775
776svc_export *
777exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
778 struct cache_req *reqp)
779{
780 struct svc_export *exp, key;
781
782 if (!clp)
783 return NULL;
784
785 key.ex_client = clp;
786 key.ex_mnt = mnt;
787 key.ex_dentry = dentry;
788
NeilBrown4f7774c2006-03-27 01:15:03 -0800789 exp = svc_export_lookup(&key);
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800790 if (exp != NULL) {
791 int err;
792
793 err = cache_check(&svc_export_cache, &exp->h, reqp);
794 switch (err) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 case 0: break;
796 case -EAGAIN:
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800797 case -ETIMEDOUT:
798 exp = ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 break;
800 default:
801 exp = NULL;
802 }
J.Bruce Fieldse0bb89e2006-12-13 00:35:25 -0800803 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 return exp;
806}
807
808/*
809 * Find the export entry for a given dentry.
810 */
811struct svc_export *
812exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
813 struct cache_req *reqp)
814{
815 svc_export *exp;
816
817 dget(dentry);
818 exp = exp_get_by_name(clp, mnt, dentry, reqp);
819
820 while (exp == NULL && !IS_ROOT(dentry)) {
821 struct dentry *parent;
822
823 parent = dget_parent(dentry);
824 dput(dentry);
825 dentry = parent;
826 exp = exp_get_by_name(clp, mnt, dentry, reqp);
827 }
828 dput(dentry);
829 return exp;
830}
831
832/*
833 * Hashtable locking. Write locks are placed only by user processes
834 * wanting to modify export information.
835 * Write locking only done in this file. Read locking
836 * needed externally.
837 */
838
839static DECLARE_RWSEM(hash_sem);
840
841void
842exp_readlock(void)
843{
844 down_read(&hash_sem);
845}
846
847static inline void
848exp_writelock(void)
849{
850 down_write(&hash_sem);
851}
852
853void
854exp_readunlock(void)
855{
856 up_read(&hash_sem);
857}
858
859static inline void
860exp_writeunlock(void)
861{
862 up_write(&hash_sem);
863}
864
865static void exp_fsid_unhash(struct svc_export *exp)
866{
867 struct svc_expkey *ek;
868
869 if ((exp->ex_flags & NFSEXP_FSID) == 0)
870 return;
871
872 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
873 if (ek && !IS_ERR(ek)) {
874 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800875 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 }
877 svc_expkey_cache.nextcheck = get_seconds();
878}
879
880static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
881{
882 u32 fsid[2];
883
884 if ((exp->ex_flags & NFSEXP_FSID) == 0)
885 return 0;
886
887 mk_fsid_v1(fsid, exp->ex_fsid);
888 return exp_set_key(clp, 1, fsid, exp);
889}
890
891static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
892{
893 u32 fsid[2];
894 struct inode *inode = exp->ex_dentry->d_inode;
895 dev_t dev = inode->i_sb->s_dev;
896
897 if (old_valid_dev(dev)) {
898 mk_fsid_v0(fsid, dev, inode->i_ino);
899 return exp_set_key(clp, 0, fsid, exp);
900 }
901 mk_fsid_v3(fsid, dev, inode->i_ino);
902 return exp_set_key(clp, 3, fsid, exp);
903}
904
905static void exp_unhash(struct svc_export *exp)
906{
907 struct svc_expkey *ek;
908 struct inode *inode = exp->ex_dentry->d_inode;
909
910 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
911 if (ek && !IS_ERR(ek)) {
912 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800913 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700914 }
915 svc_expkey_cache.nextcheck = get_seconds();
916}
917
918/*
919 * Export a file system.
920 */
921int
922exp_export(struct nfsctl_export *nxp)
923{
924 svc_client *clp;
925 struct svc_export *exp = NULL;
926 struct svc_export new;
927 struct svc_expkey *fsid_key = NULL;
928 struct nameidata nd;
929 int err;
930
931 /* Consistency check */
932 err = -EINVAL;
933 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
934 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
935 goto out;
936
937 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
938 nxp->ex_client, nxp->ex_path,
939 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
940 nxp->ex_flags);
941
942 /* Try to lock the export table for update */
943 exp_writelock();
944
945 /* Look up client info */
946 if (!(clp = auth_domain_find(nxp->ex_client)))
947 goto out_unlock;
948
949
950 /* Look up the dentry */
951 err = path_lookup(nxp->ex_path, 0, &nd);
952 if (err)
953 goto out_unlock;
954 err = -EINVAL;
955
956 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
957
NeilBrownf9884432006-12-13 00:35:45 -0800958 memset(&new, 0, sizeof(new));
959
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960 /* must make sure there won't be an ex_fsid clash */
961 if ((nxp->ex_flags & NFSEXP_FSID) &&
962 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
963 !IS_ERR(fsid_key) &&
NeilBrowneab7e2e2006-03-27 01:15:00 -0800964 fsid_key->ek_mnt &&
965 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700966 goto finish;
967
968 if (exp) {
969 /* just a flags/id/fsid update */
970
971 exp_fsid_unhash(exp);
972 exp->ex_flags = nxp->ex_flags;
973 exp->ex_anon_uid = nxp->ex_anon_uid;
974 exp->ex_anon_gid = nxp->ex_anon_gid;
975 exp->ex_fsid = nxp->ex_dev;
976
977 err = exp_fsid_hash(clp, exp);
978 goto finish;
979 }
980
981 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
982 if (err) goto finish;
983
984 err = -ENOMEM;
985
986 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
987
988 new.h.expiry_time = NEVER;
989 new.h.flags = 0;
NeilBrownf9884432006-12-13 00:35:45 -0800990 new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL);
991 if (!new.ex_path)
992 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 new.ex_client = clp;
994 new.ex_mnt = nd.mnt;
995 new.ex_dentry = nd.dentry;
996 new.ex_flags = nxp->ex_flags;
997 new.ex_anon_uid = nxp->ex_anon_uid;
998 new.ex_anon_gid = nxp->ex_anon_gid;
999 new.ex_fsid = nxp->ex_dev;
1000
NeilBrown4f7774c2006-03-27 01:15:03 -08001001 exp = svc_export_lookup(&new);
1002 if (exp)
1003 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004
NeilBrown4f7774c2006-03-27 01:15:03 -08001005 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 goto finish;
1007
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008 if (exp_hash(clp, exp) ||
1009 exp_fsid_hash(clp, exp)) {
1010 /* failed to create at least one index */
1011 exp_do_unexport(exp);
1012 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001013 } else
1014 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015finish:
NeilBrownf9884432006-12-13 00:35:45 -08001016 if (new.ex_path)
1017 kfree(new.ex_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 if (exp)
1019 exp_put(exp);
1020 if (fsid_key && !IS_ERR(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001021 cache_put(&fsid_key->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001022 if (clp)
1023 auth_domain_put(clp);
1024 path_release(&nd);
1025out_unlock:
1026 exp_writeunlock();
1027out:
1028 return err;
1029}
1030
1031/*
1032 * Unexport a file system. The export entry has already
1033 * been removed from the client's list of exported fs's.
1034 */
1035static void
1036exp_do_unexport(svc_export *unexp)
1037{
1038 unexp->h.expiry_time = get_seconds()-1;
1039 svc_export_cache.nextcheck = get_seconds();
1040 exp_unhash(unexp);
1041 exp_fsid_unhash(unexp);
1042}
1043
1044
1045/*
1046 * unexport syscall.
1047 */
1048int
1049exp_unexport(struct nfsctl_export *nxp)
1050{
1051 struct auth_domain *dom;
1052 svc_export *exp;
1053 struct nameidata nd;
1054 int err;
1055
1056 /* Consistency check */
1057 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1058 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1059 return -EINVAL;
1060
1061 exp_writelock();
1062
1063 err = -EINVAL;
1064 dom = auth_domain_find(nxp->ex_client);
1065 if (!dom) {
1066 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1067 goto out_unlock;
1068 }
1069
1070 err = path_lookup(nxp->ex_path, 0, &nd);
1071 if (err)
1072 goto out_domain;
1073
1074 err = -EINVAL;
1075 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
1076 path_release(&nd);
1077 if (!exp)
1078 goto out_domain;
1079
1080 exp_do_unexport(exp);
1081 exp_put(exp);
1082 err = 0;
1083
1084out_domain:
1085 auth_domain_put(dom);
1086 cache_flush();
1087out_unlock:
1088 exp_writeunlock();
1089 return err;
1090}
1091
1092/*
1093 * Obtain the root fh on behalf of a client.
1094 * This could be done in user space, but I feel that it adds some safety
1095 * since its harder to fool a kernel module than a user space program.
1096 */
1097int
1098exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
1099{
1100 struct svc_export *exp;
1101 struct nameidata nd;
1102 struct inode *inode;
1103 struct svc_fh fh;
1104 int err;
1105
1106 err = -EPERM;
1107 /* NB: we probably ought to check that it's NUL-terminated */
1108 if (path_lookup(path, 0, &nd)) {
1109 printk("nfsd: exp_rootfh path not found %s", path);
1110 return err;
1111 }
1112 inode = nd.dentry->d_inode;
1113
1114 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1115 path, nd.dentry, clp->name,
1116 inode->i_sb->s_id, inode->i_ino);
1117 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001118 if (IS_ERR(exp)) {
1119 err = PTR_ERR(exp);
1120 goto out;
1121 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 if (!exp) {
1123 dprintk("nfsd: exp_rootfh export not found.\n");
1124 goto out;
1125 }
1126
1127 /*
1128 * fh must be initialized before calling fh_compose
1129 */
1130 fh_init(&fh, maxsize);
1131 if (fh_compose(&fh, exp, nd.dentry, NULL))
1132 err = -EINVAL;
1133 else
1134 err = 0;
1135 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1136 fh_put(&fh);
1137 exp_put(exp);
1138out:
1139 path_release(&nd);
1140 return err;
1141}
1142
NeilBrowneab7e2e2006-03-27 01:15:00 -08001143struct svc_export *
1144exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1145 struct cache_req *reqp)
1146{
1147 struct svc_export *exp;
1148 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1149 if (!ek || IS_ERR(ek))
1150 return ERR_PTR(PTR_ERR(ek));
1151
1152 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001153 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001154
1155 if (!exp || IS_ERR(exp))
1156 return ERR_PTR(PTR_ERR(exp));
1157 return exp;
1158}
1159
1160
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161/*
1162 * Called when we need the filehandle for the root of the pseudofs,
1163 * for a given NFSv4 client. The root is defined to be the
1164 * export point with fsid==0
1165 */
Al Viroc7afef12006-10-19 23:29:02 -07001166__be32
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1168 struct cache_req *creq)
1169{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001170 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001171 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 u32 fsidv[2];
1173
1174 mk_fsid_v1(fsidv, 0);
1175
J.Bruce Fieldsf38b20c2006-10-04 02:16:09 -07001176 exp = exp_find(clp, 1, fsidv, creq);
J.Bruce Fields68993202006-12-13 00:35:23 -08001177 if (IS_ERR(exp))
1178 return nfserrno(PTR_ERR(exp));
NeilBrowneab7e2e2006-03-27 01:15:00 -08001179 if (exp == NULL)
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001180 return nfserr_perm;
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001181 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1182 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 return rv;
1184}
1185
1186/* Iterator */
1187
1188static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001189 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190{
1191 loff_t n = *pos;
1192 unsigned hash, export;
1193 struct cache_head *ch;
1194
1195 exp_readlock();
1196 read_lock(&svc_export_cache.hash_lock);
1197 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001198 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001199 hash = n >> 32;
1200 export = n & ((1LL<<32) - 1);
1201
1202
1203 for (ch=export_table[hash]; ch; ch=ch->next)
1204 if (!export--)
1205 return ch;
1206 n &= ~((1LL<<32) - 1);
1207 do {
1208 hash++;
1209 n += 1LL<<32;
1210 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1211 if (hash >= EXPORT_HASHMAX)
1212 return NULL;
1213 *pos = n+1;
1214 return export_table[hash];
1215}
1216
1217static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1218{
1219 struct cache_head *ch = p;
1220 int hash = (*pos >> 32);
1221
Greg Banksbc6f02e2006-10-02 02:17:49 -07001222 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001223 hash = 0;
1224 else if (ch->next == NULL) {
1225 hash++;
1226 *pos += 1LL<<32;
1227 } else {
1228 ++*pos;
1229 return ch->next;
1230 }
1231 *pos &= ~((1LL<<32) - 1);
1232 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1233 hash++;
1234 *pos += 1LL<<32;
1235 }
1236 if (hash >= EXPORT_HASHMAX)
1237 return NULL;
1238 ++*pos;
1239 return export_table[hash];
1240}
1241
1242static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001243 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244{
1245 read_unlock(&svc_export_cache.hash_lock);
1246 exp_readunlock();
1247}
1248
1249static struct flags {
1250 int flag;
1251 char *name[2];
1252} expflags[] = {
1253 { NFSEXP_READONLY, {"ro", "rw"}},
1254 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1255 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1256 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1257 { NFSEXP_ASYNC, {"async", "sync"}},
1258 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1259 { NFSEXP_NOHIDE, {"nohide", ""}},
1260 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1261 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1262 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1263#ifdef MSNFS
1264 { NFSEXP_MSNFS, {"msnfs", ""}},
1265#endif
1266 { 0, {"", ""}}
1267};
1268
Manoj Naik933469192006-10-04 02:16:18 -07001269static void exp_flags(struct seq_file *m, int flag, int fsid,
1270 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001271{
1272 int first = 0;
1273 struct flags *flg;
1274
1275 for (flg = expflags; flg->flag; flg++) {
1276 int state = (flg->flag & flag)?0:1;
1277 if (*flg->name[state])
1278 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1279 }
1280 if (flag & NFSEXP_FSID)
1281 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1282 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1283 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1284 if (anong != (gid_t)-2 && anong != (0x10000-2))
1285 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001286 if (fsloc && fsloc->locations_count > 0) {
1287 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1288 int i;
1289
1290 seq_printf(m, "%s%s=", first++?",":"", loctype);
1291 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1292 seq_putc(m, '@');
1293 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1294 for (i = 1; i < fsloc->locations_count; i++) {
1295 seq_putc(m, ';');
1296 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1297 seq_putc(m, '@');
1298 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1299 }
1300 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001301}
1302
1303static int e_show(struct seq_file *m, void *p)
1304{
1305 struct cache_head *cp = p;
1306 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307
Greg Banksbc6f02e2006-10-02 02:17:49 -07001308 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 seq_puts(m, "# Version 1.1\n");
1310 seq_puts(m, "# Path Client(Flags) # IPs\n");
1311 return 0;
1312 }
1313
Linus Torvalds1da177e2005-04-16 15:20:36 -07001314 cache_get(&exp->h);
1315 if (cache_check(&svc_export_cache, &exp->h, NULL))
1316 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001317 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 return svc_export_show(m, &svc_export_cache, cp);
1319}
1320
1321struct seq_operations nfs_exports_op = {
1322 .start = e_start,
1323 .next = e_next,
1324 .stop = e_stop,
1325 .show = e_show,
1326};
1327
1328/*
1329 * Add or modify a client.
1330 * Change requests may involve the list of host addresses. The list of
1331 * exports and possibly existing uid maps are left untouched.
1332 */
1333int
1334exp_addclient(struct nfsctl_client *ncp)
1335{
1336 struct auth_domain *dom;
1337 int i, err;
1338
1339 /* First, consistency check. */
1340 err = -EINVAL;
1341 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1342 goto out;
1343 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1344 goto out;
1345
1346 /* Lock the hashtable */
1347 exp_writelock();
1348
1349 dom = unix_domain_find(ncp->cl_ident);
1350
1351 err = -ENOMEM;
1352 if (!dom)
1353 goto out_unlock;
1354
1355 /* Insert client into hashtable. */
1356 for (i = 0; i < ncp->cl_naddr; i++)
1357 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1358
1359 auth_unix_forget_old(dom);
1360 auth_domain_put(dom);
1361
1362 err = 0;
1363
1364out_unlock:
1365 exp_writeunlock();
1366out:
1367 return err;
1368}
1369
1370/*
1371 * Delete a client given an identifier.
1372 */
1373int
1374exp_delclient(struct nfsctl_client *ncp)
1375{
1376 int err;
1377 struct auth_domain *dom;
1378
1379 err = -EINVAL;
1380 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1381 goto out;
1382
1383 /* Lock the hashtable */
1384 exp_writelock();
1385
1386 dom = auth_domain_find(ncp->cl_ident);
1387 /* just make sure that no addresses work
1388 * and that it will expire soon
1389 */
1390 if (dom) {
1391 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 auth_domain_put(dom);
1393 }
1394
1395 exp_writeunlock();
1396out:
1397 return err;
1398}
1399
1400/*
1401 * Verify that string is non-empty and does not exceed max length.
1402 */
1403static int
1404exp_verify_string(char *cp, int max)
1405{
1406 int i;
1407
1408 for (i = 0; i < max; i++)
1409 if (!cp[i])
1410 return i;
1411 cp[i] = 0;
1412 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1413 return 0;
1414}
1415
1416/*
1417 * Initialize the exports module.
1418 */
1419void
1420nfsd_export_init(void)
1421{
1422 dprintk("nfsd: initializing export module.\n");
1423
1424 cache_register(&svc_export_cache);
1425 cache_register(&svc_expkey_cache);
1426
1427}
1428
1429/*
1430 * Flush exports table - called when last nfsd thread is killed
1431 */
1432void
1433nfsd_export_flush(void)
1434{
1435 exp_writelock();
1436 cache_purge(&svc_expkey_cache);
1437 cache_purge(&svc_export_cache);
1438 exp_writeunlock();
1439}
1440
1441/*
1442 * Shutdown the exports module.
1443 */
1444void
1445nfsd_export_shutdown(void)
1446{
1447
1448 dprintk("nfsd: shutting down export module.\n");
1449
1450 exp_writelock();
1451
1452 if (cache_unregister(&svc_expkey_cache))
1453 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1454 if (cache_unregister(&svc_export_cache))
1455 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1456 svcauth_unix_purge();
1457
1458 exp_writeunlock();
1459 dprintk("nfsd: export shutdown complete.\n");
1460}