blob: 597b3cbf8b0b6b1eefeafcb8636204c180ca2b76 [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
NeilBrown8d270f72006-03-27 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;
NeilBrown8d270f72006-03-27 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
NeilBrown8d270f72006-03-27 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 */
NeilBrown8d270f72006-03-27 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);
NeilBrown8d270f72006-03-27 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);
NeilBrown8d270f72006-03-27 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
NeilBrown8d270f72006-03-27 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);
NeilBrown8d270f72006-03-27 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}
NeilBrown8d270f72006-03-27 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,
NeilBrown8d270f72006-03-27 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
NeilBrown8d270f72006-03-27 01:15:04 -0800275static struct svc_expkey *
276svc_expkey_lookup(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
NeilBrown8d270f72006-03-27 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
NeilBrown8d270f72006-03-27 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{
NeilBrown8d270f72006-03-27 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
NeilBrownbaab9352006-03-27 01:15:09 -0800322static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323{
NeilBrownbaab9352006-03-27 01:15:09 -0800324 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
325 dput(exp->ex_dentry);
326 mntput(exp->ex_mnt);
327 auth_domain_put(exp->ex_client);
328 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329}
330
331static void svc_export_request(struct cache_detail *cd,
332 struct cache_head *h,
333 char **bpp, int *blen)
334{
335 /* client path */
336 struct svc_export *exp = container_of(h, struct svc_export, h);
337 char *pth;
338
339 qword_add(bpp, blen, exp->ex_client->name);
340 pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen);
341 if (IS_ERR(pth)) {
342 /* is this correct? */
343 (*bpp)[0] = '\n';
344 return;
345 }
346 qword_add(bpp, blen, pth);
347 (*bpp)[-1] = '\n';
348}
349
Adrian Bunk74cae612006-03-27 01:15:10 -0800350static struct svc_export *svc_export_update(struct svc_export *new,
351 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800352static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353
354static int check_export(struct inode *inode, int flags)
355{
356
357 /* We currently export only dirs and regular files.
358 * This is what umountd does.
359 */
360 if (!S_ISDIR(inode->i_mode) &&
361 !S_ISREG(inode->i_mode))
362 return -ENOTDIR;
363
364 /* There are two requirements on a filesystem to be exportable.
365 * 1: We must be able to identify the filesystem from a number.
366 * either a device number (so FS_REQUIRES_DEV needed)
367 * or an FSID number (so NFSEXP_FSID needed).
368 * 2: We must be able to find an inode from a filehandle.
369 * This means that s_export_op must be set.
370 */
371 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
372 !(flags & NFSEXP_FSID)) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700373 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 return -EINVAL;
375 }
376 if (!inode->i_sb->s_export_op) {
377 dprintk("exp_export: export of invalid fs type.\n");
378 return -EINVAL;
379 }
380
381 /* Ok, we can export it */;
382 if (!inode->i_sb->s_export_op->find_exported_dentry)
383 inode->i_sb->s_export_op->find_exported_dentry =
384 find_exported_dentry;
385 return 0;
386
387}
388
389static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
390{
391 /* client path expiry [flags anonuid anongid fsid] */
392 char *buf;
393 int len;
394 int err;
395 struct auth_domain *dom = NULL;
396 struct nameidata nd;
397 struct svc_export exp, *expp;
398 int an_int;
399
400 nd.dentry = NULL;
401
402 if (mesg[mlen-1] != '\n')
403 return -EINVAL;
404 mesg[mlen-1] = 0;
405
406 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
407 err = -ENOMEM;
408 if (!buf) goto out;
409
410 /* client */
411 len = qword_get(&mesg, buf, PAGE_SIZE);
412 err = -EINVAL;
413 if (len <= 0) goto out;
414
415 err = -ENOENT;
416 dom = auth_domain_find(buf);
417 if (!dom)
418 goto out;
419
420 /* path */
421 err = -EINVAL;
422 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
423 goto out;
424 err = path_lookup(buf, 0, &nd);
NeilBrowncd156542006-04-10 22:55:27 -0700425 if (err) goto out_no_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
427 exp.h.flags = 0;
428 exp.ex_client = dom;
429 exp.ex_mnt = nd.mnt;
430 exp.ex_dentry = nd.dentry;
431
432 /* expiry */
433 err = -EINVAL;
434 exp.h.expiry_time = get_expiry(&mesg);
435 if (exp.h.expiry_time == 0)
436 goto out;
437
438 /* flags */
439 err = get_int(&mesg, &an_int);
440 if (err == -ENOENT)
441 set_bit(CACHE_NEGATIVE, &exp.h.flags);
442 else {
443 if (err || an_int < 0) goto out;
444 exp.ex_flags= an_int;
445
446 /* anon uid */
447 err = get_int(&mesg, &an_int);
448 if (err) goto out;
449 exp.ex_anon_uid= an_int;
450
451 /* anon gid */
452 err = get_int(&mesg, &an_int);
453 if (err) goto out;
454 exp.ex_anon_gid= an_int;
455
456 /* fsid */
457 err = get_int(&mesg, &an_int);
458 if (err) goto out;
459 exp.ex_fsid = an_int;
460
461 err = check_export(nd.dentry->d_inode, exp.ex_flags);
462 if (err) goto out;
463 }
464
NeilBrown4f7774c2006-03-27 01:15:03 -0800465 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800467 expp = svc_export_update(&exp, expp);
468 else
469 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800471 if (expp == NULL)
472 err = -ENOMEM;
473 else
474 exp_put(expp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 out:
476 if (nd.dentry)
477 path_release(&nd);
NeilBrowncd156542006-04-10 22:55:27 -0700478 out_no_path:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 if (dom)
480 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800481 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 return err;
483}
484
485static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong);
486
487static int svc_export_show(struct seq_file *m,
488 struct cache_detail *cd,
489 struct cache_head *h)
490{
491 struct svc_export *exp ;
492
493 if (h ==NULL) {
494 seq_puts(m, "#path domain(flags)\n");
495 return 0;
496 }
497 exp = container_of(h, struct svc_export, h);
498 seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\");
499 seq_putc(m, '\t');
500 seq_escape(m, exp->ex_client->name, " \t\n\\");
501 seq_putc(m, '(');
502 if (test_bit(CACHE_VALID, &h->flags) &&
503 !test_bit(CACHE_NEGATIVE, &h->flags))
504 exp_flags(m, exp->ex_flags, exp->ex_fsid,
505 exp->ex_anon_uid, exp->ex_anon_gid);
506 seq_puts(m, ")\n");
507 return 0;
508}
NeilBrown4f7774c2006-03-27 01:15:03 -0800509static int svc_export_match(struct cache_head *a, struct cache_head *b)
510{
511 struct svc_export *orig = container_of(a, struct svc_export, h);
512 struct svc_export *new = container_of(b, struct svc_export, h);
513 return orig->ex_client == new->ex_client &&
514 orig->ex_dentry == new->ex_dentry &&
515 orig->ex_mnt == new->ex_mnt;
516}
517
518static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
519{
520 struct svc_export *new = container_of(cnew, struct svc_export, h);
521 struct svc_export *item = container_of(citem, struct svc_export, h);
522
523 kref_get(&item->ex_client->ref);
524 new->ex_client = item->ex_client;
525 new->ex_dentry = dget(item->ex_dentry);
526 new->ex_mnt = mntget(item->ex_mnt);
527}
528
529static void export_update(struct cache_head *cnew, struct cache_head *citem)
530{
531 struct svc_export *new = container_of(cnew, struct svc_export, h);
532 struct svc_export *item = container_of(citem, struct svc_export, h);
533
534 new->ex_flags = item->ex_flags;
535 new->ex_anon_uid = item->ex_anon_uid;
536 new->ex_anon_gid = item->ex_anon_gid;
537 new->ex_fsid = item->ex_fsid;
538}
539
540static struct cache_head *svc_export_alloc(void)
541{
542 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
543 if (i)
544 return &i->h;
545 else
546 return NULL;
547}
548
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700550 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 .hash_size = EXPORT_HASHMAX,
552 .hash_table = export_table,
553 .name = "nfsd.export",
554 .cache_put = svc_export_put,
555 .cache_request = svc_export_request,
556 .cache_parse = svc_export_parse,
557 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800558 .match = svc_export_match,
559 .init = svc_export_init,
560 .update = export_update,
561 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562};
563
NeilBrown4f7774c2006-03-27 01:15:03 -0800564static struct svc_export *
565svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
NeilBrown4f7774c2006-03-27 01:15:03 -0800567 struct cache_head *ch;
568 int hash;
569 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
570 hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
571 hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
572
573 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
574 hash);
575 if (ch)
576 return container_of(ch, struct svc_export, h);
577 else
578 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700579}
580
Adrian Bunk74cae612006-03-27 01:15:10 -0800581static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800582svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700583{
NeilBrown4f7774c2006-03-27 01:15:03 -0800584 struct cache_head *ch;
585 int hash;
586 hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
587 hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
588 hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589
NeilBrown4f7774c2006-03-27 01:15:03 -0800590 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
591 &old->h,
592 hash);
593 if (ch)
594 return container_of(ch, struct svc_export, h);
595 else
596 return NULL;
597}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598
599
Adrian Bunk74cae612006-03-27 01:15:10 -0800600static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
602{
603 struct svc_expkey key, *ek;
604 int err;
605
606 if (!clp)
607 return NULL;
608
609 key.ek_client = clp;
610 key.ek_fsidtype = fsid_type;
611 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
612
NeilBrown8d270f72006-03-27 01:15:04 -0800613 ek = svc_expkey_lookup(&key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 if (ek != NULL)
615 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
616 ek = ERR_PTR(err);
617 return ek;
618}
619
620static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
621 struct svc_export *exp)
622{
623 struct svc_expkey key, *ek;
624
625 key.ek_client = clp;
626 key.ek_fsidtype = fsid_type;
627 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
NeilBrowneab7e2e2006-03-27 01:15:00 -0800628 key.ek_mnt = exp->ex_mnt;
629 key.ek_dentry = exp->ex_dentry;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 key.h.expiry_time = NEVER;
631 key.h.flags = 0;
632
NeilBrown8d270f72006-03-27 01:15:04 -0800633 ek = svc_expkey_lookup(&key);
634 if (ek)
635 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800637 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 return 0;
639 }
640 return -ENOMEM;
641}
642
643/*
644 * Find the client's export entry matching xdev/xino.
645 */
646static inline struct svc_expkey *
647exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
648{
649 u32 fsidv[3];
650
651 if (old_valid_dev(dev)) {
652 mk_fsid_v0(fsidv, dev, ino);
653 return exp_find_key(clp, 0, fsidv, NULL);
654 }
655 mk_fsid_v3(fsidv, dev, ino);
656 return exp_find_key(clp, 3, fsidv, NULL);
657}
658
659/*
660 * Find the client's export entry matching fsid
661 */
662static inline struct svc_expkey *
663exp_get_fsid_key(svc_client *clp, int fsid)
664{
665 u32 fsidv[2];
666
667 mk_fsid_v1(fsidv, fsid);
668
669 return exp_find_key(clp, 1, fsidv, NULL);
670}
671
672svc_export *
673exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
674 struct cache_req *reqp)
675{
676 struct svc_export *exp, key;
677
678 if (!clp)
679 return NULL;
680
681 key.ex_client = clp;
682 key.ex_mnt = mnt;
683 key.ex_dentry = dentry;
684
NeilBrown4f7774c2006-03-27 01:15:03 -0800685 exp = svc_export_lookup(&key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 if (exp != NULL)
687 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
688 case 0: break;
689 case -EAGAIN:
690 exp = ERR_PTR(-EAGAIN);
691 break;
692 default:
693 exp = NULL;
694 }
695
696 return exp;
697}
698
699/*
700 * Find the export entry for a given dentry.
701 */
702struct svc_export *
703exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
704 struct cache_req *reqp)
705{
706 svc_export *exp;
707
708 dget(dentry);
709 exp = exp_get_by_name(clp, mnt, dentry, reqp);
710
711 while (exp == NULL && !IS_ROOT(dentry)) {
712 struct dentry *parent;
713
714 parent = dget_parent(dentry);
715 dput(dentry);
716 dentry = parent;
717 exp = exp_get_by_name(clp, mnt, dentry, reqp);
718 }
719 dput(dentry);
720 return exp;
721}
722
723/*
724 * Hashtable locking. Write locks are placed only by user processes
725 * wanting to modify export information.
726 * Write locking only done in this file. Read locking
727 * needed externally.
728 */
729
730static DECLARE_RWSEM(hash_sem);
731
732void
733exp_readlock(void)
734{
735 down_read(&hash_sem);
736}
737
738static inline void
739exp_writelock(void)
740{
741 down_write(&hash_sem);
742}
743
744void
745exp_readunlock(void)
746{
747 up_read(&hash_sem);
748}
749
750static inline void
751exp_writeunlock(void)
752{
753 up_write(&hash_sem);
754}
755
756static void exp_fsid_unhash(struct svc_export *exp)
757{
758 struct svc_expkey *ek;
759
760 if ((exp->ex_flags & NFSEXP_FSID) == 0)
761 return;
762
763 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
764 if (ek && !IS_ERR(ek)) {
765 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800766 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 }
768 svc_expkey_cache.nextcheck = get_seconds();
769}
770
771static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
772{
773 u32 fsid[2];
774
775 if ((exp->ex_flags & NFSEXP_FSID) == 0)
776 return 0;
777
778 mk_fsid_v1(fsid, exp->ex_fsid);
779 return exp_set_key(clp, 1, fsid, exp);
780}
781
782static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
783{
784 u32 fsid[2];
785 struct inode *inode = exp->ex_dentry->d_inode;
786 dev_t dev = inode->i_sb->s_dev;
787
788 if (old_valid_dev(dev)) {
789 mk_fsid_v0(fsid, dev, inode->i_ino);
790 return exp_set_key(clp, 0, fsid, exp);
791 }
792 mk_fsid_v3(fsid, dev, inode->i_ino);
793 return exp_set_key(clp, 3, fsid, exp);
794}
795
796static void exp_unhash(struct svc_export *exp)
797{
798 struct svc_expkey *ek;
799 struct inode *inode = exp->ex_dentry->d_inode;
800
801 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
802 if (ek && !IS_ERR(ek)) {
803 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800804 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 }
806 svc_expkey_cache.nextcheck = get_seconds();
807}
808
809/*
810 * Export a file system.
811 */
812int
813exp_export(struct nfsctl_export *nxp)
814{
815 svc_client *clp;
816 struct svc_export *exp = NULL;
817 struct svc_export new;
818 struct svc_expkey *fsid_key = NULL;
819 struct nameidata nd;
820 int err;
821
822 /* Consistency check */
823 err = -EINVAL;
824 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
825 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
826 goto out;
827
828 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
829 nxp->ex_client, nxp->ex_path,
830 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
831 nxp->ex_flags);
832
833 /* Try to lock the export table for update */
834 exp_writelock();
835
836 /* Look up client info */
837 if (!(clp = auth_domain_find(nxp->ex_client)))
838 goto out_unlock;
839
840
841 /* Look up the dentry */
842 err = path_lookup(nxp->ex_path, 0, &nd);
843 if (err)
844 goto out_unlock;
845 err = -EINVAL;
846
847 exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL);
848
849 /* must make sure there won't be an ex_fsid clash */
850 if ((nxp->ex_flags & NFSEXP_FSID) &&
851 (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
852 !IS_ERR(fsid_key) &&
NeilBrowneab7e2e2006-03-27 01:15:00 -0800853 fsid_key->ek_mnt &&
854 (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 goto finish;
856
857 if (exp) {
858 /* just a flags/id/fsid update */
859
860 exp_fsid_unhash(exp);
861 exp->ex_flags = nxp->ex_flags;
862 exp->ex_anon_uid = nxp->ex_anon_uid;
863 exp->ex_anon_gid = nxp->ex_anon_gid;
864 exp->ex_fsid = nxp->ex_dev;
865
866 err = exp_fsid_hash(clp, exp);
867 goto finish;
868 }
869
870 err = check_export(nd.dentry->d_inode, nxp->ex_flags);
871 if (err) goto finish;
872
873 err = -ENOMEM;
874
875 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
876
877 new.h.expiry_time = NEVER;
878 new.h.flags = 0;
879 new.ex_client = clp;
880 new.ex_mnt = nd.mnt;
881 new.ex_dentry = nd.dentry;
882 new.ex_flags = nxp->ex_flags;
883 new.ex_anon_uid = nxp->ex_anon_uid;
884 new.ex_anon_gid = nxp->ex_anon_gid;
885 new.ex_fsid = nxp->ex_dev;
886
NeilBrown4f7774c2006-03-27 01:15:03 -0800887 exp = svc_export_lookup(&new);
888 if (exp)
889 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890
NeilBrown4f7774c2006-03-27 01:15:03 -0800891 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 goto finish;
893
Linus Torvalds1da177e2005-04-16 15:20:36 -0700894 if (exp_hash(clp, exp) ||
895 exp_fsid_hash(clp, exp)) {
896 /* failed to create at least one index */
897 exp_do_unexport(exp);
898 cache_flush();
899 err = -ENOMEM;
900 }
901
902finish:
903 if (exp)
904 exp_put(exp);
905 if (fsid_key && !IS_ERR(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -0800906 cache_put(&fsid_key->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700907 if (clp)
908 auth_domain_put(clp);
909 path_release(&nd);
910out_unlock:
911 exp_writeunlock();
912out:
913 return err;
914}
915
916/*
917 * Unexport a file system. The export entry has already
918 * been removed from the client's list of exported fs's.
919 */
920static void
921exp_do_unexport(svc_export *unexp)
922{
923 unexp->h.expiry_time = get_seconds()-1;
924 svc_export_cache.nextcheck = get_seconds();
925 exp_unhash(unexp);
926 exp_fsid_unhash(unexp);
927}
928
929
930/*
931 * unexport syscall.
932 */
933int
934exp_unexport(struct nfsctl_export *nxp)
935{
936 struct auth_domain *dom;
937 svc_export *exp;
938 struct nameidata nd;
939 int err;
940
941 /* Consistency check */
942 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
943 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
944 return -EINVAL;
945
946 exp_writelock();
947
948 err = -EINVAL;
949 dom = auth_domain_find(nxp->ex_client);
950 if (!dom) {
951 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
952 goto out_unlock;
953 }
954
955 err = path_lookup(nxp->ex_path, 0, &nd);
956 if (err)
957 goto out_domain;
958
959 err = -EINVAL;
960 exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
961 path_release(&nd);
962 if (!exp)
963 goto out_domain;
964
965 exp_do_unexport(exp);
966 exp_put(exp);
967 err = 0;
968
969out_domain:
970 auth_domain_put(dom);
971 cache_flush();
972out_unlock:
973 exp_writeunlock();
974 return err;
975}
976
977/*
978 * Obtain the root fh on behalf of a client.
979 * This could be done in user space, but I feel that it adds some safety
980 * since its harder to fool a kernel module than a user space program.
981 */
982int
983exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize)
984{
985 struct svc_export *exp;
986 struct nameidata nd;
987 struct inode *inode;
988 struct svc_fh fh;
989 int err;
990
991 err = -EPERM;
992 /* NB: we probably ought to check that it's NUL-terminated */
993 if (path_lookup(path, 0, &nd)) {
994 printk("nfsd: exp_rootfh path not found %s", path);
995 return err;
996 }
997 inode = nd.dentry->d_inode;
998
999 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
1000 path, nd.dentry, clp->name,
1001 inode->i_sb->s_id, inode->i_ino);
1002 exp = exp_parent(clp, nd.mnt, nd.dentry, NULL);
1003 if (!exp) {
1004 dprintk("nfsd: exp_rootfh export not found.\n");
1005 goto out;
1006 }
1007
1008 /*
1009 * fh must be initialized before calling fh_compose
1010 */
1011 fh_init(&fh, maxsize);
1012 if (fh_compose(&fh, exp, nd.dentry, NULL))
1013 err = -EINVAL;
1014 else
1015 err = 0;
1016 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1017 fh_put(&fh);
1018 exp_put(exp);
1019out:
1020 path_release(&nd);
1021 return err;
1022}
1023
NeilBrowneab7e2e2006-03-27 01:15:00 -08001024struct svc_export *
1025exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
1026 struct cache_req *reqp)
1027{
1028 struct svc_export *exp;
1029 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
1030 if (!ek || IS_ERR(ek))
1031 return ERR_PTR(PTR_ERR(ek));
1032
1033 exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001034 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001035
1036 if (!exp || IS_ERR(exp))
1037 return ERR_PTR(PTR_ERR(exp));
1038 return exp;
1039}
1040
1041
Linus Torvalds1da177e2005-04-16 15:20:36 -07001042/*
1043 * Called when we need the filehandle for the root of the pseudofs,
1044 * for a given NFSv4 client. The root is defined to be the
1045 * export point with fsid==0
1046 */
1047int
1048exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
1049 struct cache_req *creq)
1050{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001051 struct svc_export *exp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 int rv;
1053 u32 fsidv[2];
1054
1055 mk_fsid_v1(fsidv, 0);
1056
J.Bruce Fieldsf38b20c2006-10-04 02:16:09 -07001057 exp = exp_find(clp, 1, fsidv, creq);
1058 if (IS_ERR(exp) && PTR_ERR(exp) == -EAGAIN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 return nfserr_dropit;
NeilBrowneab7e2e2006-03-27 01:15:00 -08001060 if (exp == NULL)
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001061 return nfserr_perm;
NeilBrowneab7e2e2006-03-27 01:15:00 -08001062 else if (IS_ERR(exp))
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001063 return nfserrno(PTR_ERR(exp));
1064 rv = fh_compose(fhp, exp, exp->ex_dentry, NULL);
1065 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 return rv;
1067}
1068
1069/* Iterator */
1070
1071static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001072 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001073{
1074 loff_t n = *pos;
1075 unsigned hash, export;
1076 struct cache_head *ch;
1077
1078 exp_readlock();
1079 read_lock(&svc_export_cache.hash_lock);
1080 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001081 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 hash = n >> 32;
1083 export = n & ((1LL<<32) - 1);
1084
1085
1086 for (ch=export_table[hash]; ch; ch=ch->next)
1087 if (!export--)
1088 return ch;
1089 n &= ~((1LL<<32) - 1);
1090 do {
1091 hash++;
1092 n += 1LL<<32;
1093 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1094 if (hash >= EXPORT_HASHMAX)
1095 return NULL;
1096 *pos = n+1;
1097 return export_table[hash];
1098}
1099
1100static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1101{
1102 struct cache_head *ch = p;
1103 int hash = (*pos >> 32);
1104
Greg Banksbc6f02e2006-10-02 02:17:49 -07001105 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 hash = 0;
1107 else if (ch->next == NULL) {
1108 hash++;
1109 *pos += 1LL<<32;
1110 } else {
1111 ++*pos;
1112 return ch->next;
1113 }
1114 *pos &= ~((1LL<<32) - 1);
1115 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1116 hash++;
1117 *pos += 1LL<<32;
1118 }
1119 if (hash >= EXPORT_HASHMAX)
1120 return NULL;
1121 ++*pos;
1122 return export_table[hash];
1123}
1124
1125static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001126 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127{
1128 read_unlock(&svc_export_cache.hash_lock);
1129 exp_readunlock();
1130}
1131
1132static struct flags {
1133 int flag;
1134 char *name[2];
1135} expflags[] = {
1136 { NFSEXP_READONLY, {"ro", "rw"}},
1137 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1138 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1139 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1140 { NFSEXP_ASYNC, {"async", "sync"}},
1141 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1142 { NFSEXP_NOHIDE, {"nohide", ""}},
1143 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1144 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1145 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
1146#ifdef MSNFS
1147 { NFSEXP_MSNFS, {"msnfs", ""}},
1148#endif
1149 { 0, {"", ""}}
1150};
1151
1152static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong)
1153{
1154 int first = 0;
1155 struct flags *flg;
1156
1157 for (flg = expflags; flg->flag; flg++) {
1158 int state = (flg->flag & flag)?0:1;
1159 if (*flg->name[state])
1160 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1161 }
1162 if (flag & NFSEXP_FSID)
1163 seq_printf(m, "%sfsid=%d", first++?",":"", fsid);
1164 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
1165 seq_printf(m, "%sanonuid=%d", first++?",":"", anonu);
1166 if (anong != (gid_t)-2 && anong != (0x10000-2))
1167 seq_printf(m, "%sanongid=%d", first++?",":"", anong);
1168}
1169
1170static int e_show(struct seq_file *m, void *p)
1171{
1172 struct cache_head *cp = p;
1173 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174
Greg Banksbc6f02e2006-10-02 02:17:49 -07001175 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001176 seq_puts(m, "# Version 1.1\n");
1177 seq_puts(m, "# Path Client(Flags) # IPs\n");
1178 return 0;
1179 }
1180
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 cache_get(&exp->h);
1182 if (cache_check(&svc_export_cache, &exp->h, NULL))
1183 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001184 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185 return svc_export_show(m, &svc_export_cache, cp);
1186}
1187
1188struct seq_operations nfs_exports_op = {
1189 .start = e_start,
1190 .next = e_next,
1191 .stop = e_stop,
1192 .show = e_show,
1193};
1194
1195/*
1196 * Add or modify a client.
1197 * Change requests may involve the list of host addresses. The list of
1198 * exports and possibly existing uid maps are left untouched.
1199 */
1200int
1201exp_addclient(struct nfsctl_client *ncp)
1202{
1203 struct auth_domain *dom;
1204 int i, err;
1205
1206 /* First, consistency check. */
1207 err = -EINVAL;
1208 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1209 goto out;
1210 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1211 goto out;
1212
1213 /* Lock the hashtable */
1214 exp_writelock();
1215
1216 dom = unix_domain_find(ncp->cl_ident);
1217
1218 err = -ENOMEM;
1219 if (!dom)
1220 goto out_unlock;
1221
1222 /* Insert client into hashtable. */
1223 for (i = 0; i < ncp->cl_naddr; i++)
1224 auth_unix_add_addr(ncp->cl_addrlist[i], dom);
1225
1226 auth_unix_forget_old(dom);
1227 auth_domain_put(dom);
1228
1229 err = 0;
1230
1231out_unlock:
1232 exp_writeunlock();
1233out:
1234 return err;
1235}
1236
1237/*
1238 * Delete a client given an identifier.
1239 */
1240int
1241exp_delclient(struct nfsctl_client *ncp)
1242{
1243 int err;
1244 struct auth_domain *dom;
1245
1246 err = -EINVAL;
1247 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1248 goto out;
1249
1250 /* Lock the hashtable */
1251 exp_writelock();
1252
1253 dom = auth_domain_find(ncp->cl_ident);
1254 /* just make sure that no addresses work
1255 * and that it will expire soon
1256 */
1257 if (dom) {
1258 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001259 auth_domain_put(dom);
1260 }
1261
1262 exp_writeunlock();
1263out:
1264 return err;
1265}
1266
1267/*
1268 * Verify that string is non-empty and does not exceed max length.
1269 */
1270static int
1271exp_verify_string(char *cp, int max)
1272{
1273 int i;
1274
1275 for (i = 0; i < max; i++)
1276 if (!cp[i])
1277 return i;
1278 cp[i] = 0;
1279 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1280 return 0;
1281}
1282
1283/*
1284 * Initialize the exports module.
1285 */
1286void
1287nfsd_export_init(void)
1288{
1289 dprintk("nfsd: initializing export module.\n");
1290
1291 cache_register(&svc_export_cache);
1292 cache_register(&svc_expkey_cache);
1293
1294}
1295
1296/*
1297 * Flush exports table - called when last nfsd thread is killed
1298 */
1299void
1300nfsd_export_flush(void)
1301{
1302 exp_writelock();
1303 cache_purge(&svc_expkey_cache);
1304 cache_purge(&svc_export_cache);
1305 exp_writeunlock();
1306}
1307
1308/*
1309 * Shutdown the exports module.
1310 */
1311void
1312nfsd_export_shutdown(void)
1313{
1314
1315 dprintk("nfsd: shutting down export module.\n");
1316
1317 exp_writelock();
1318
1319 if (cache_unregister(&svc_expkey_cache))
1320 printk(KERN_ERR "nfsd: failed to unregister expkey cache\n");
1321 if (cache_unregister(&svc_export_cache))
1322 printk(KERN_ERR "nfsd: failed to unregister export cache\n");
1323 svcauth_unix_purge();
1324
1325 exp_writeunlock();
1326 dprintk("nfsd: export shutdown complete.\n");
1327}