blob: 067e2e612e2de73f4c081b9746b906ca346bc415 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001#define MSNFS /* HACK HACK */
2/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07003 * NFS exporting and validation.
4 *
5 * We maintain a list of clients, each of which has a list of
6 * exports. To export an fs to a given client, you first have
7 * to create the client entry with NFSCTL_ADDCLIENT, which
8 * creates a client control block and adds it to the hash
9 * table. Then, you call NFSCTL_EXPORT for each fs.
10 *
11 *
12 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
13 */
14
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/namei.h>
Bruce Allanf35279d2005-09-06 15:17:08 -070017#include <linux/module.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070018#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/nfsd/syscall.h>
Aurélien Charbonf15364b2008-01-18 15:50:56 +010021#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
Boaz Harrosh9a74af22009-12-03 20:30:56 +020023#include "nfsd.h"
J. Bruce Fields1557aca2009-12-04 19:36:06 -050024#include "nfsfh.h"
Boaz Harrosh9a74af22009-12-03 20:30:56 +020025
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070027
28typedef struct auth_domain svc_client;
29typedef struct svc_export svc_export;
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031/*
32 * We have two caches.
33 * One maps client+vfsmnt+dentry to export options - the export map
34 * The other maps client+filehandle-fragment to export options. - the expkey map
35 *
36 * The export options are actually stored in the first map, and the
37 * second map contains a reference to the entry in the first map.
38 */
39
40#define EXPKEY_HASHBITS 8
41#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
42#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
43static struct cache_head *expkey_table[EXPKEY_HASHMAX];
44
Adrian Bunk74cae612006-03-27 01:15:10 -080045static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070046{
NeilBrownbaab9352006-03-27 01:15:09 -080047 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
48
49 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080050 !test_bit(CACHE_NEGATIVE, &key->h.flags))
51 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080052 auth_domain_put(key->ek_client);
53 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054}
55
56static void expkey_request(struct cache_detail *cd,
57 struct cache_head *h,
58 char **bpp, int *blen)
59{
60 /* client fsidtype \xfsid */
61 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
62 char type[5];
63
64 qword_add(bpp, blen, ek->ek_client->name);
65 snprintf(type, 5, "%d", ek->ek_fsidtype);
66 qword_add(bpp, blen, type);
67 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
68 (*bpp)[-1] = '\n';
69}
70
Trond Myklebustbc74b4f2009-08-09 15:14:29 -040071static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
72{
73 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
74}
75
NeilBrown8d270f72006-03-27 01:15:04 -080076static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
77static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080078static struct cache_detail svc_expkey_cache;
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
81{
82 /* client fsidtype fsid [path] */
83 char *buf;
84 int len;
85 struct auth_domain *dom = NULL;
86 int err;
87 int fsidtype;
88 char *ep;
89 struct svc_expkey key;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040090 struct svc_expkey *ek = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
92 if (mesg[mlen-1] != '\n')
93 return -EINVAL;
94 mesg[mlen-1] = 0;
95
96 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
97 err = -ENOMEM;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040098 if (!buf)
99 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 err = -EINVAL;
102 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
103 goto out;
104
105 err = -ENOENT;
106 dom = auth_domain_find(buf);
107 if (!dom)
108 goto out;
109 dprintk("found domain %s\n", buf);
110
111 err = -EINVAL;
112 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
113 goto out;
114 fsidtype = simple_strtoul(buf, &ep, 10);
115 if (*ep)
116 goto out;
117 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700118 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 goto out;
120 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
121 goto out;
122 dprintk("found fsid length %d\n", len);
123 if (len != key_len(fsidtype))
124 goto out;
125
126 /* OK, we seem to have a valid key */
127 key.h.flags = 0;
128 key.h.expiry_time = get_expiry(&mesg);
129 if (key.h.expiry_time == 0)
130 goto out;
131
132 key.ek_client = dom;
133 key.ek_fsidtype = fsidtype;
134 memcpy(key.ek_fsid, buf, len);
135
NeilBrown8d270f72006-03-27 01:15:04 -0800136 ek = svc_expkey_lookup(&key);
137 err = -ENOMEM;
138 if (!ek)
139 goto out;
140
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f72006-03-27 01:15:04 -0800142 err = -EINVAL;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400143 len = qword_get(&mesg, buf, PAGE_SIZE);
144 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 goto out;
146 dprintk("Path seems to be <%s>\n", buf);
147 err = 0;
148 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f72006-03-27 01:15:04 -0800150 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400151 if (!ek)
152 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 } else {
Al Viroa63bb992008-08-02 01:03:36 -0400154 err = kern_path(buf, 0, &key.ek_path);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400155 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 goto out;
157
158 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800159
NeilBrown8d270f72006-03-27 01:15:04 -0800160 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400161 if (!ek)
NeilBrown8d270f72006-03-27 01:15:04 -0800162 err = -ENOMEM;
Al Viroa63bb992008-08-02 01:03:36 -0400163 path_put(&key.ek_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 }
165 cache_flush();
166 out:
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400167 if (ek)
168 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 if (dom)
170 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800171 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 return err;
173}
174
175static int expkey_show(struct seq_file *m,
176 struct cache_detail *cd,
177 struct cache_head *h)
178{
179 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800180 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182 if (h ==NULL) {
183 seq_puts(m, "#domain fsidtype fsid [path]\n");
184 return 0;
185 }
186 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800187 seq_printf(m, "%s %d 0x", ek->ek_client->name,
188 ek->ek_fsidtype);
189 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
190 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 if (test_bit(CACHE_VALID, &h->flags) &&
192 !test_bit(CACHE_NEGATIVE, &h->flags)) {
193 seq_printf(m, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800194 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
196 seq_printf(m, "\n");
197 return 0;
198}
NeilBrown8d270f72006-03-27 01:15:04 -0800199
200static inline int expkey_match (struct cache_head *a, struct cache_head *b)
201{
202 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
203 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
204
205 if (orig->ek_fsidtype != new->ek_fsidtype ||
206 orig->ek_client != new->ek_client ||
207 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
208 return 0;
209 return 1;
210}
211
212static inline void expkey_init(struct cache_head *cnew,
213 struct cache_head *citem)
214{
215 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
216 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
217
218 kref_get(&item->ek_client->ref);
219 new->ek_client = item->ek_client;
220 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800221
222 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f72006-03-27 01:15:04 -0800223}
224
225static inline void expkey_update(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
Jan Bluncke83aece2008-02-14 19:38:41 -0800231 new->ek_path = item->ek_path;
232 path_get(&item->ek_path);
NeilBrown8d270f72006-03-27 01:15:04 -0800233}
234
235static struct cache_head *expkey_alloc(void)
236{
237 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
238 if (i)
239 return &i->h;
240 else
241 return NULL;
242}
243
Adrian Bunk74cae612006-03-27 01:15:10 -0800244static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700245 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 .hash_size = EXPKEY_HASHMAX,
247 .hash_table = expkey_table,
248 .name = "nfsd.fh",
249 .cache_put = expkey_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400250 .cache_upcall = expkey_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 .cache_parse = expkey_parse,
252 .cache_show = expkey_show,
NeilBrown8d270f72006-03-27 01:15:04 -0800253 .match = expkey_match,
254 .init = expkey_init,
255 .update = expkey_update,
256 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257};
258
NeilBrown61f86032010-02-03 17:31:31 +1100259static int
260svc_expkey_hash(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
NeilBrown8d270f72006-03-27 01:15:04 -0800262 int hash = item->ek_fsidtype;
263 char * cp = (char*)item->ek_fsid;
264 int len = key_len(item->ek_fsidtype);
265
266 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
267 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
268 hash &= EXPKEY_HASHMASK;
NeilBrown61f86032010-02-03 17:31:31 +1100269 return hash;
270}
271
272static struct svc_expkey *
273svc_expkey_lookup(struct svc_expkey *item)
274{
275 struct cache_head *ch;
276 int hash = svc_expkey_hash(item);
NeilBrown8d270f72006-03-27 01:15:04 -0800277
278 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
279 hash);
280 if (ch)
281 return container_of(ch, struct svc_expkey, h);
282 else
283 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
NeilBrown8d270f72006-03-27 01:15:04 -0800286static struct svc_expkey *
287svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
NeilBrown8d270f72006-03-27 01:15:04 -0800289 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100290 int hash = svc_expkey_hash(new);
NeilBrown8d270f72006-03-27 01:15:04 -0800291
292 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
293 &old->h, hash);
294 if (ch)
295 return container_of(ch, struct svc_expkey, h);
296 else
297 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298}
299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301#define EXPORT_HASHBITS 8
302#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
303#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
304
305static struct cache_head *export_table[EXPORT_HASHMAX];
306
Manoj Naik93346912006-10-04 02:16:18 -0700307static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
308{
309 int i;
310
311 for (i = 0; i < fsloc->locations_count; i++) {
312 kfree(fsloc->locations[i].path);
313 kfree(fsloc->locations[i].hosts);
314 }
315 kfree(fsloc->locations);
316}
317
NeilBrownbaab9352006-03-27 01:15:09 -0800318static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
NeilBrownbaab9352006-03-27 01:15:09 -0800320 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
Jan Blunck54775492008-02-14 19:38:39 -0800321 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800322 auth_domain_put(exp->ex_client);
Jan Blunck54775492008-02-14 19:38:39 -0800323 kfree(exp->ex_pathname);
Manoj Naik93346912006-10-04 02:16:18 -0700324 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800325 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
328static void svc_export_request(struct cache_detail *cd,
329 struct cache_head *h,
330 char **bpp, int *blen)
331{
332 /* client path */
333 struct svc_export *exp = container_of(h, struct svc_export, h);
334 char *pth;
335
336 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunckcf28b482008-02-14 19:38:44 -0800337 pth = d_path(&exp->ex_path, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 if (IS_ERR(pth)) {
339 /* is this correct? */
340 (*bpp)[0] = '\n';
341 return;
342 }
343 qword_add(bpp, blen, pth);
344 (*bpp)[-1] = '\n';
345}
346
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400347static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
348{
349 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
350}
351
Adrian Bunk74cae612006-03-27 01:15:10 -0800352static struct svc_export *svc_export_update(struct svc_export *new,
353 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800354static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355
J. Bruce Fields774b1472009-12-13 20:21:48 -0500356static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357{
358
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500359 /*
360 * We currently export only dirs, regular files, and (for v4
361 * pseudoroot) symlinks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 */
363 if (!S_ISDIR(inode->i_mode) &&
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500364 !S_ISLNK(inode->i_mode) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 !S_ISREG(inode->i_mode))
366 return -ENOTDIR;
367
J. Bruce Fields774b1472009-12-13 20:21:48 -0500368 /*
369 * Mountd should never pass down a writeable V4ROOT export, but,
370 * just to make sure:
371 */
372 if (*flags & NFSEXP_V4ROOT)
373 *flags |= NFSEXP_READONLY;
374
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 /* There are two requirements on a filesystem to be exportable.
376 * 1: We must be able to identify the filesystem from a number.
377 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800378 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 * 2: We must be able to find an inode from a filehandle.
380 * This means that s_export_op must be set.
381 */
382 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
J. Bruce Fields774b1472009-12-13 20:21:48 -0500383 !(*flags & NFSEXP_FSID) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800384 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700385 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 return -EINVAL;
387 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700388
389 if (!inode->i_sb->s_export_op ||
390 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 dprintk("exp_export: export of invalid fs type.\n");
392 return -EINVAL;
393 }
394
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395 return 0;
396
397}
398
Manoj Naik93346912006-10-04 02:16:18 -0700399#ifdef CONFIG_NFSD_V4
400
401static int
402fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
403{
404 int len;
405 int migrated, i, err;
406
Manoj Naik93346912006-10-04 02:16:18 -0700407 /* listsize */
408 err = get_int(mesg, &fsloc->locations_count);
409 if (err)
410 return err;
411 if (fsloc->locations_count > MAX_FS_LOCATIONS)
412 return -EINVAL;
413 if (fsloc->locations_count == 0)
414 return 0;
415
416 fsloc->locations = kzalloc(fsloc->locations_count
417 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
418 if (!fsloc->locations)
419 return -ENOMEM;
420 for (i=0; i < fsloc->locations_count; i++) {
421 /* colon separated host list */
422 err = -EINVAL;
423 len = qword_get(mesg, buf, PAGE_SIZE);
424 if (len <= 0)
425 goto out_free_all;
426 err = -ENOMEM;
427 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
428 if (!fsloc->locations[i].hosts)
429 goto out_free_all;
430 err = -EINVAL;
431 /* slash separated path component list */
432 len = qword_get(mesg, buf, PAGE_SIZE);
433 if (len <= 0)
434 goto out_free_all;
435 err = -ENOMEM;
436 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
437 if (!fsloc->locations[i].path)
438 goto out_free_all;
439 }
440 /* migrated */
441 err = get_int(mesg, &migrated);
442 if (err)
443 goto out_free_all;
444 err = -EINVAL;
445 if (migrated < 0 || migrated > 1)
446 goto out_free_all;
447 fsloc->migrated = migrated;
448 return 0;
449out_free_all:
450 nfsd4_fslocs_free(fsloc);
451 return err;
452}
453
Andy Adamsone677bfe2007-07-17 04:04:42 -0700454static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
455{
456 int listsize, err;
457 struct exp_flavor_info *f;
458
459 err = get_int(mesg, &listsize);
460 if (err)
461 return err;
462 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
463 return -EINVAL;
464
465 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
466 err = get_int(mesg, &f->pseudoflavor);
467 if (err)
468 return err;
469 /*
Roel Kluin80492e72009-04-21 16:08:39 +0200470 * XXX: It would be nice to also check whether this
471 * pseudoflavor is supported, so we can discover the
472 * problem at export time instead of when a client fails
473 * to authenticate.
Andy Adamsone677bfe2007-07-17 04:04:42 -0700474 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700475 err = get_int(mesg, &f->flags);
476 if (err)
477 return err;
478 /* Only some flags are allowed to differ between flavors: */
479 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
480 return -EINVAL;
481 }
482 exp->ex_nflavors = listsize;
483 return 0;
484}
485
Manoj Naik93346912006-10-04 02:16:18 -0700486#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700487static inline int
488fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
489static inline int
490secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik93346912006-10-04 02:16:18 -0700491#endif
492
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
494{
495 /* client path expiry [flags anonuid anongid fsid] */
496 char *buf;
497 int len;
498 int err;
499 struct auth_domain *dom = NULL;
Al Viroc1a2a472008-08-02 01:01:02 -0400500 struct svc_export exp = {}, *expp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 int an_int;
502
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 if (mesg[mlen-1] != '\n')
504 return -EINVAL;
505 mesg[mlen-1] = 0;
506
507 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Al Viroc1a2a472008-08-02 01:01:02 -0400508 if (!buf)
509 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 /* client */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400513 len = qword_get(&mesg, buf, PAGE_SIZE);
514 if (len <= 0)
515 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 err = -ENOENT;
518 dom = auth_domain_find(buf);
519 if (!dom)
520 goto out;
521
522 /* path */
523 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400524 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
525 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526
Al Viroc1a2a472008-08-02 01:01:02 -0400527 err = kern_path(buf, 0, &exp.ex_path);
528 if (err)
529 goto out1;
530
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 exp.ex_client = dom;
Al Viroc1a2a472008-08-02 01:01:02 -0400532
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700533 err = -ENOMEM;
Al Viroc1a2a472008-08-02 01:01:02 -0400534 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
Jan Blunck54775492008-02-14 19:38:39 -0800535 if (!exp.ex_pathname)
Al Viroc1a2a472008-08-02 01:01:02 -0400536 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
538 /* expiry */
539 err = -EINVAL;
540 exp.h.expiry_time = get_expiry(&mesg);
541 if (exp.h.expiry_time == 0)
Al Viroc1a2a472008-08-02 01:01:02 -0400542 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
544 /* flags */
545 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700546 if (err == -ENOENT) {
547 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700549 } else {
Al Viroc1a2a472008-08-02 01:01:02 -0400550 if (err || an_int < 0)
551 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 exp.ex_flags= an_int;
553
554 /* anon uid */
555 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400556 if (err)
557 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 exp.ex_anon_uid= an_int;
559
560 /* anon gid */
561 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400562 if (err)
563 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 exp.ex_anon_gid= an_int;
565
566 /* fsid */
567 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400568 if (err)
569 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 exp.ex_fsid = an_int;
571
NeilBrownaf6a4e22007-02-14 00:33:12 -0800572 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
573 if (strcmp(buf, "fsloc") == 0)
574 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
575 else if (strcmp(buf, "uuid") == 0) {
576 /* expect a 16 byte uuid encoded as \xXXXX... */
577 len = qword_get(&mesg, buf, PAGE_SIZE);
578 if (len != 16)
579 err = -EINVAL;
580 else {
581 exp.ex_uuid =
582 kmemdup(buf, 16, GFP_KERNEL);
583 if (exp.ex_uuid == NULL)
584 err = -ENOMEM;
585 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700586 } else if (strcmp(buf, "secinfo") == 0)
587 err = secinfo_parse(&mesg, buf, &exp);
588 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800589 /* quietly ignore unknown words and anything
590 * following. Newer user-space can try to set
591 * new values, then see what the result was.
592 */
593 break;
594 if (err)
Al Viroc1a2a472008-08-02 01:01:02 -0400595 goto out4;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800596 }
Manoj Naik93346912006-10-04 02:16:18 -0700597
J. Bruce Fields774b1472009-12-13 20:21:48 -0500598 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800599 exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400600 if (err)
601 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 }
603
NeilBrown4f7774c2006-03-27 01:15:03 -0800604 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800606 expp = svc_export_update(&exp, expp);
607 else
608 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800610 if (expp == NULL)
611 err = -ENOMEM;
612 else
613 exp_put(expp);
Al Viroc1a2a472008-08-02 01:01:02 -0400614out4:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800615 nfsd4_fslocs_free(&exp.ex_fslocs);
616 kfree(exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400617out3:
Jan Blunck54775492008-02-14 19:38:39 -0800618 kfree(exp.ex_pathname);
Al Viroc1a2a472008-08-02 01:01:02 -0400619out2:
620 path_put(&exp.ex_path);
621out1:
622 auth_domain_put(dom);
623out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800624 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700625 return err;
626}
627
Manoj Naik93346912006-10-04 02:16:18 -0700628static void exp_flags(struct seq_file *m, int flag, int fsid,
629 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700630static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631
632static int svc_export_show(struct seq_file *m,
633 struct cache_detail *cd,
634 struct cache_head *h)
635{
636 struct svc_export *exp ;
637
638 if (h ==NULL) {
639 seq_puts(m, "#path domain(flags)\n");
640 return 0;
641 }
642 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800643 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 seq_putc(m, '\t');
645 seq_escape(m, exp->ex_client->name, " \t\n\\");
646 seq_putc(m, '(');
647 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800648 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik93346912006-10-04 02:16:18 -0700649 exp_flags(m, exp->ex_flags, exp->ex_fsid,
650 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800651 if (exp->ex_uuid) {
652 int i;
653 seq_puts(m, ",uuid=");
654 for (i=0; i<16; i++) {
655 if ((i&3) == 0 && i)
656 seq_putc(m, ':');
657 seq_printf(m, "%02x", exp->ex_uuid[i]);
658 }
659 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700660 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800661 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 seq_puts(m, ")\n");
663 return 0;
664}
NeilBrown4f7774c2006-03-27 01:15:03 -0800665static int svc_export_match(struct cache_head *a, struct cache_head *b)
666{
667 struct svc_export *orig = container_of(a, struct svc_export, h);
668 struct svc_export *new = container_of(b, struct svc_export, h);
669 return orig->ex_client == new->ex_client &&
Jan Blunck54775492008-02-14 19:38:39 -0800670 orig->ex_path.dentry == new->ex_path.dentry &&
671 orig->ex_path.mnt == new->ex_path.mnt;
NeilBrown4f7774c2006-03-27 01:15:03 -0800672}
673
674static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
675{
676 struct svc_export *new = container_of(cnew, struct svc_export, h);
677 struct svc_export *item = container_of(citem, struct svc_export, h);
678
679 kref_get(&item->ex_client->ref);
680 new->ex_client = item->ex_client;
Jan Blunck54775492008-02-14 19:38:39 -0800681 new->ex_path.dentry = dget(item->ex_path.dentry);
682 new->ex_path.mnt = mntget(item->ex_path.mnt);
683 new->ex_pathname = NULL;
Manoj Naik93346912006-10-04 02:16:18 -0700684 new->ex_fslocs.locations = NULL;
685 new->ex_fslocs.locations_count = 0;
686 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800687}
688
689static void export_update(struct cache_head *cnew, struct cache_head *citem)
690{
691 struct svc_export *new = container_of(cnew, struct svc_export, h);
692 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700693 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800694
695 new->ex_flags = item->ex_flags;
696 new->ex_anon_uid = item->ex_anon_uid;
697 new->ex_anon_gid = item->ex_anon_gid;
698 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800699 new->ex_uuid = item->ex_uuid;
700 item->ex_uuid = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800701 new->ex_pathname = item->ex_pathname;
702 item->ex_pathname = NULL;
Manoj Naik93346912006-10-04 02:16:18 -0700703 new->ex_fslocs.locations = item->ex_fslocs.locations;
704 item->ex_fslocs.locations = NULL;
705 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
706 item->ex_fslocs.locations_count = 0;
707 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
708 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700709 new->ex_nflavors = item->ex_nflavors;
710 for (i = 0; i < MAX_SECINFO_LIST; i++) {
711 new->ex_flavors[i] = item->ex_flavors[i];
712 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800713}
714
715static struct cache_head *svc_export_alloc(void)
716{
717 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
718 if (i)
719 return &i->h;
720 else
721 return NULL;
722}
723
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700725 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 .hash_size = EXPORT_HASHMAX,
727 .hash_table = export_table,
728 .name = "nfsd.export",
729 .cache_put = svc_export_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400730 .cache_upcall = svc_export_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 .cache_parse = svc_export_parse,
732 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800733 .match = svc_export_match,
734 .init = svc_export_init,
735 .update = export_update,
736 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737};
738
NeilBrown61f86032010-02-03 17:31:31 +1100739static int
740svc_export_hash(struct svc_export *exp)
741{
742 int hash;
743
744 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
745 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
746 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
747 return hash;
748}
749
NeilBrown4f7774c2006-03-27 01:15:03 -0800750static struct svc_export *
751svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752{
NeilBrown4f7774c2006-03-27 01:15:03 -0800753 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100754 int hash = svc_export_hash(exp);
NeilBrown4f7774c2006-03-27 01:15:03 -0800755
756 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
757 hash);
758 if (ch)
759 return container_of(ch, struct svc_export, h);
760 else
761 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762}
763
Adrian Bunk74cae612006-03-27 01:15:10 -0800764static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800765svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
NeilBrown4f7774c2006-03-27 01:15:03 -0800767 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100768 int hash = svc_export_hash(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
NeilBrown4f7774c2006-03-27 01:15:03 -0800770 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
771 &old->h,
772 hash);
773 if (ch)
774 return container_of(ch, struct svc_export, h);
775 else
776 return NULL;
777}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
779
Adrian Bunk74cae612006-03-27 01:15:10 -0800780static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
782{
783 struct svc_expkey key, *ek;
784 int err;
785
786 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700787 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
789 key.ek_client = clp;
790 key.ek_fsidtype = fsid_type;
791 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
792
NeilBrown8d270f72006-03-27 01:15:04 -0800793 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700794 if (ek == NULL)
795 return ERR_PTR(-ENOMEM);
796 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
797 if (err)
798 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 return ek;
800}
801
NeilBrown1e140562010-09-22 12:55:07 +1000802#ifdef CONFIG_NFSD_DEPRECATED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
804 struct svc_export *exp)
805{
806 struct svc_expkey key, *ek;
807
808 key.ek_client = clp;
809 key.ek_fsidtype = fsid_type;
810 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
Jan Bluncke83aece2008-02-14 19:38:41 -0800811 key.ek_path = exp->ex_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 key.h.expiry_time = NEVER;
813 key.h.flags = 0;
814
NeilBrown8d270f72006-03-27 01:15:04 -0800815 ek = svc_expkey_lookup(&key);
816 if (ek)
817 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800819 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 return 0;
821 }
822 return -ENOMEM;
823}
824
825/*
826 * Find the client's export entry matching xdev/xino.
827 */
828static inline struct svc_expkey *
829exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
830{
831 u32 fsidv[3];
832
833 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800834 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
835 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800837 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
838 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839}
840
841/*
842 * Find the client's export entry matching fsid
843 */
844static inline struct svc_expkey *
845exp_get_fsid_key(svc_client *clp, int fsid)
846{
847 u32 fsidv[2];
848
NeilBrownaf6a4e22007-02-14 00:33:12 -0800849 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
NeilBrownaf6a4e22007-02-14 00:33:12 -0800851 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852}
NeilBrown1e140562010-09-22 12:55:07 +1000853#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854
Al Viro55430e22009-04-18 02:04:46 -0400855static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
856 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857{
858 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700859 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800860
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700862 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 key.ex_client = clp;
Al Viro55430e22009-04-18 02:04:46 -0400865 key.ex_path = *path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866
NeilBrown4f7774c2006-03-27 01:15:03 -0800867 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700868 if (exp == NULL)
869 return ERR_PTR(-ENOMEM);
870 err = cache_check(&svc_export_cache, &exp->h, reqp);
871 if (err)
872 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 return exp;
874}
875
876/*
877 * Find the export entry for a given dentry.
878 */
Al Viro5bf3bd22009-04-18 02:14:32 -0400879static struct svc_export *exp_parent(svc_client *clp, struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880{
Al Viro5bf3bd22009-04-18 02:14:32 -0400881 struct dentry *saved = dget(path->dentry);
882 svc_export *exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700883
Al Viro5bf3bd22009-04-18 02:14:32 -0400884 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
885 struct dentry *parent = dget_parent(path->dentry);
886 dput(path->dentry);
887 path->dentry = parent;
888 exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889 }
Al Viro5bf3bd22009-04-18 02:14:32 -0400890 dput(path->dentry);
891 path->dentry = saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700892 return exp;
893}
894
NeilBrown1e140562010-09-22 12:55:07 +1000895#ifdef CONFIG_NFSD_DEPRECATED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896/*
897 * Hashtable locking. Write locks are placed only by user processes
898 * wanting to modify export information.
899 * Write locking only done in this file. Read locking
900 * needed externally.
901 */
902
903static DECLARE_RWSEM(hash_sem);
904
905void
906exp_readlock(void)
907{
908 down_read(&hash_sem);
909}
910
911static inline void
912exp_writelock(void)
913{
914 down_write(&hash_sem);
915}
916
917void
918exp_readunlock(void)
919{
920 up_read(&hash_sem);
921}
922
923static inline void
924exp_writeunlock(void)
925{
926 up_write(&hash_sem);
927}
NeilBrown1e140562010-09-22 12:55:07 +1000928#else
929
930/* hash_sem not needed once deprecated interface is removed */
931void exp_readlock(void) {}
932static inline void exp_writelock(void){}
933void exp_readunlock(void) {}
934static inline void exp_writeunlock(void){}
935
936#endif
937
938#ifdef CONFIG_NFSD_DEPRECATED
939static void exp_do_unexport(svc_export *unexp);
940static int exp_verify_string(char *cp, int max);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941
942static void exp_fsid_unhash(struct svc_export *exp)
943{
944 struct svc_expkey *ek;
945
946 if ((exp->ex_flags & NFSEXP_FSID) == 0)
947 return;
948
949 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700950 if (!IS_ERR(ek)) {
NeilBrown17cebf62010-08-12 16:55:22 +1000951 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
NeilBrownbaab9352006-03-27 01:15:09 -0800952 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954}
955
956static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
957{
958 u32 fsid[2];
959
960 if ((exp->ex_flags & NFSEXP_FSID) == 0)
961 return 0;
962
NeilBrownaf6a4e22007-02-14 00:33:12 -0800963 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
964 return exp_set_key(clp, FSID_NUM, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965}
966
967static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
968{
969 u32 fsid[2];
Jan Blunck54775492008-02-14 19:38:39 -0800970 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700971 dev_t dev = inode->i_sb->s_dev;
972
973 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800974 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
975 return exp_set_key(clp, FSID_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800977 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
978 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700979}
980
981static void exp_unhash(struct svc_export *exp)
982{
983 struct svc_expkey *ek;
Jan Blunck54775492008-02-14 19:38:39 -0800984 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700985
986 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700987 if (!IS_ERR(ek)) {
NeilBrown17cebf62010-08-12 16:55:22 +1000988 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
NeilBrownbaab9352006-03-27 01:15:09 -0800989 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991}
992
993/*
994 * Export a file system.
995 */
996int
997exp_export(struct nfsctl_export *nxp)
998{
999 svc_client *clp;
1000 struct svc_export *exp = NULL;
1001 struct svc_export new;
1002 struct svc_expkey *fsid_key = NULL;
Al Viroa63bb992008-08-02 01:03:36 -04001003 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004 int err;
1005
1006 /* Consistency check */
1007 err = -EINVAL;
1008 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1009 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1010 goto out;
1011
1012 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1013 nxp->ex_client, nxp->ex_path,
1014 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1015 nxp->ex_flags);
1016
1017 /* Try to lock the export table for update */
1018 exp_writelock();
1019
1020 /* Look up client info */
1021 if (!(clp = auth_domain_find(nxp->ex_client)))
1022 goto out_unlock;
1023
1024
1025 /* Look up the dentry */
Al Viroa63bb992008-08-02 01:03:36 -04001026 err = kern_path(nxp->ex_path, 0, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 if (err)
Julia Lawall53e6d8d2008-07-25 22:08:09 +02001028 goto out_put_clp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029 err = -EINVAL;
1030
Al Viro55430e22009-04-18 02:04:46 -04001031 exp = exp_get_by_name(clp, &path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032
NeilBrownf9884432006-12-13 00:35:45 -08001033 memset(&new, 0, sizeof(new));
1034
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 /* must make sure there won't be an ex_fsid clash */
1036 if ((nxp->ex_flags & NFSEXP_FSID) &&
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001037 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
Jan Bluncke83aece2008-02-14 19:38:41 -08001038 fsid_key->ek_path.mnt &&
Al Viroa63bb992008-08-02 01:03:36 -04001039 (fsid_key->ek_path.mnt != path.mnt ||
1040 fsid_key->ek_path.dentry != path.dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041 goto finish;
1042
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001043 if (!IS_ERR(exp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001044 /* just a flags/id/fsid update */
1045
1046 exp_fsid_unhash(exp);
1047 exp->ex_flags = nxp->ex_flags;
1048 exp->ex_anon_uid = nxp->ex_anon_uid;
1049 exp->ex_anon_gid = nxp->ex_anon_gid;
1050 exp->ex_fsid = nxp->ex_dev;
1051
1052 err = exp_fsid_hash(clp, exp);
1053 goto finish;
1054 }
1055
J. Bruce Fields774b1472009-12-13 20:21:48 -05001056 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 if (err) goto finish;
1058
1059 err = -ENOMEM;
1060
1061 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1062
1063 new.h.expiry_time = NEVER;
1064 new.h.flags = 0;
Jan Blunck54775492008-02-14 19:38:39 -08001065 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1066 if (!new.ex_pathname)
NeilBrownf9884432006-12-13 00:35:45 -08001067 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001068 new.ex_client = clp;
Al Viroa63bb992008-08-02 01:03:36 -04001069 new.ex_path = path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001070 new.ex_flags = nxp->ex_flags;
1071 new.ex_anon_uid = nxp->ex_anon_uid;
1072 new.ex_anon_gid = nxp->ex_anon_gid;
1073 new.ex_fsid = nxp->ex_dev;
1074
NeilBrown4f7774c2006-03-27 01:15:03 -08001075 exp = svc_export_lookup(&new);
1076 if (exp)
1077 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078
NeilBrown4f7774c2006-03-27 01:15:03 -08001079 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001080 goto finish;
1081
Linus Torvalds1da177e2005-04-16 15:20:36 -07001082 if (exp_hash(clp, exp) ||
1083 exp_fsid_hash(clp, exp)) {
1084 /* failed to create at least one index */
1085 exp_do_unexport(exp);
1086 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001087 } else
1088 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089finish:
Jan Blunck54775492008-02-14 19:38:39 -08001090 kfree(new.ex_pathname);
Dan Carpenterd03859a2010-04-22 11:30:59 +02001091 if (!IS_ERR_OR_NULL(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001092 exp_put(exp);
Dan Carpenterd03859a2010-04-22 11:30:59 +02001093 if (!IS_ERR_OR_NULL(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001094 cache_put(&fsid_key->h, &svc_expkey_cache);
Al Viroa63bb992008-08-02 01:03:36 -04001095 path_put(&path);
Julia Lawall53e6d8d2008-07-25 22:08:09 +02001096out_put_clp:
1097 auth_domain_put(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001098out_unlock:
1099 exp_writeunlock();
1100out:
1101 return err;
1102}
1103
1104/*
1105 * Unexport a file system. The export entry has already
1106 * been removed from the client's list of exported fs's.
1107 */
1108static void
1109exp_do_unexport(svc_export *unexp)
1110{
NeilBrown17cebf62010-08-12 16:55:22 +10001111 sunrpc_invalidate(&unexp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112 exp_unhash(unexp);
1113 exp_fsid_unhash(unexp);
1114}
1115
1116
1117/*
1118 * unexport syscall.
1119 */
1120int
1121exp_unexport(struct nfsctl_export *nxp)
1122{
1123 struct auth_domain *dom;
1124 svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -04001125 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126 int err;
1127
1128 /* Consistency check */
1129 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1130 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1131 return -EINVAL;
1132
1133 exp_writelock();
1134
1135 err = -EINVAL;
1136 dom = auth_domain_find(nxp->ex_client);
1137 if (!dom) {
1138 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1139 goto out_unlock;
1140 }
1141
Al Viroa63bb992008-08-02 01:03:36 -04001142 err = kern_path(nxp->ex_path, 0, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001143 if (err)
1144 goto out_domain;
1145
1146 err = -EINVAL;
Al Viro55430e22009-04-18 02:04:46 -04001147 exp = exp_get_by_name(dom, &path, NULL);
Al Viroa63bb992008-08-02 01:03:36 -04001148 path_put(&path);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001149 if (IS_ERR(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001150 goto out_domain;
1151
1152 exp_do_unexport(exp);
1153 exp_put(exp);
1154 err = 0;
1155
1156out_domain:
1157 auth_domain_put(dom);
1158 cache_flush();
1159out_unlock:
1160 exp_writeunlock();
1161 return err;
1162}
NeilBrown1e140562010-09-22 12:55:07 +10001163#endif /* CONFIG_NFSD_DEPRECATED */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164
1165/*
1166 * Obtain the root fh on behalf of a client.
1167 * This could be done in user space, but I feel that it adds some safety
1168 * since its harder to fool a kernel module than a user space program.
1169 */
1170int
Al Viroa63bb992008-08-02 01:03:36 -04001171exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172{
1173 struct svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -04001174 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175 struct inode *inode;
1176 struct svc_fh fh;
1177 int err;
1178
1179 err = -EPERM;
1180 /* NB: we probably ought to check that it's NUL-terminated */
Al Viroa63bb992008-08-02 01:03:36 -04001181 if (kern_path(name, 0, &path)) {
1182 printk("nfsd: exp_rootfh path not found %s", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 return err;
1184 }
Al Viroa63bb992008-08-02 01:03:36 -04001185 inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001186
1187 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Al Viroa63bb992008-08-02 01:03:36 -04001188 name, path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001189 inode->i_sb->s_id, inode->i_ino);
Al Viro5bf3bd22009-04-18 02:14:32 -04001190 exp = exp_parent(clp, &path);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001191 if (IS_ERR(exp)) {
1192 err = PTR_ERR(exp);
1193 goto out;
1194 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195
1196 /*
1197 * fh must be initialized before calling fh_compose
1198 */
1199 fh_init(&fh, maxsize);
Al Viroa63bb992008-08-02 01:03:36 -04001200 if (fh_compose(&fh, exp, path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001201 err = -EINVAL;
1202 else
1203 err = 0;
1204 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1205 fh_put(&fh);
1206 exp_put(exp);
1207out:
Al Viroa63bb992008-08-02 01:03:36 -04001208 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209 return err;
1210}
1211
Adrian Bunkcce76f92007-10-16 01:27:52 -07001212static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1213 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -08001214{
1215 struct svc_export *exp;
1216 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001217 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -08001218 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001219
Al Viro55430e22009-04-18 02:04:46 -04001220 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001221 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001222
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001223 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -08001224 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001225 return exp;
1226}
1227
Andy Adamson32c1eb02007-07-17 04:04:48 -07001228__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1229{
1230 struct exp_flavor_info *f;
1231 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1232
1233 /* legacy gss-only clients are always OK: */
1234 if (exp->ex_client == rqstp->rq_gssclient)
1235 return 0;
1236 /* ip-address based client; check sec= export option: */
1237 for (f = exp->ex_flavors; f < end; f++) {
1238 if (f->pseudoflavor == rqstp->rq_flavor)
1239 return 0;
1240 }
1241 /* defaults in absence of sec= options: */
1242 if (exp->ex_nflavors == 0) {
1243 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1244 rqstp->rq_flavor == RPC_AUTH_UNIX)
1245 return 0;
1246 }
1247 return nfserr_wrongsec;
1248}
1249
J. Bruce Fields0989a782007-07-17 04:04:44 -07001250/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001251 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1252 * auth_unix client) if it's available and has secinfo information;
1253 * otherwise, will try to use rq_gssclient.
1254 *
J. Bruce Fields0989a782007-07-17 04:04:44 -07001255 * Called from functions that handle requests; functions that do work on
1256 * behalf of mountd are passed a single client name to use, and should
1257 * use exp_get_by_name() or exp_find().
1258 */
1259struct svc_export *
Al Viro91c9fa82009-04-18 02:42:05 -04001260rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -07001261{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001262 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001263
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001264 if (rqstp->rq_client == NULL)
1265 goto gss;
1266
1267 /* First try the auth_unix client: */
Al Viro91c9fa82009-04-18 02:42:05 -04001268 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001269 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;
Al Viro91c9fa82009-04-18 02:42:05 -04001280 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001281 if (PTR_ERR(gssexp) == -ENOENT)
1282 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001283 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001284 exp_put(exp);
1285 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001286}
1287
1288struct svc_export *
1289rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1290{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001291 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001292
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001293 if (rqstp->rq_client == NULL)
1294 goto gss;
1295
1296 /* First try the auth_unix client: */
1297 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1298 if (PTR_ERR(exp) == -ENOENT)
1299 goto gss;
1300 if (IS_ERR(exp))
1301 return exp;
1302 /* If it has secinfo, assume there are no gss/... clients */
1303 if (exp->ex_nflavors > 0)
1304 return exp;
1305gss:
1306 /* Otherwise, try falling back on gss client */
1307 if (rqstp->rq_gssclient == NULL)
1308 return exp;
1309 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1310 &rqstp->rq_chandle);
1311 if (PTR_ERR(gssexp) == -ENOENT)
1312 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001313 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001314 exp_put(exp);
1315 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001316}
1317
1318struct svc_export *
Al Viroe64c3902009-04-18 03:00:46 -04001319rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -07001320{
Al Viroe64c3902009-04-18 03:00:46 -04001321 struct dentry *saved = dget(path->dentry);
1322 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001323
Al Viroe64c3902009-04-18 03:00:46 -04001324 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1325 struct dentry *parent = dget_parent(path->dentry);
1326 dput(path->dentry);
1327 path->dentry = parent;
1328 exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001329 }
Al Viroe64c3902009-04-18 03:00:46 -04001330 dput(path->dentry);
1331 path->dentry = saved;
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001332 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001333}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001334
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001335static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1336{
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001337 u32 fsidv[2];
1338
1339 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1340
J. Bruce Fields260c64d2010-02-08 13:42:26 -05001341 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001342}
1343
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344/*
1345 * Called when we need the filehandle for the root of the pseudofs,
1346 * for a given NFSv4 client. The root is defined to be the
1347 * export point with fsid==0
1348 */
Al Viroc7afef12006-10-19 23:29:02 -07001349__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001350exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001352 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001353 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001354
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001355 exp = find_fsidzero_export(rqstp);
J.Bruce Fields68993202006-12-13 00:35:23 -08001356 if (IS_ERR(exp))
1357 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001358 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001359 if (rv)
1360 goto out;
1361 rv = check_nfsd_access(exp, rqstp);
Trond Myklebust2671a4b2009-09-02 16:48:32 -04001362 if (rv)
1363 fh_put(fhp);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001364out:
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001365 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 return rv;
1367}
1368
1369/* Iterator */
1370
1371static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001372 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373{
1374 loff_t n = *pos;
1375 unsigned hash, export;
1376 struct cache_head *ch;
1377
1378 exp_readlock();
1379 read_lock(&svc_export_cache.hash_lock);
1380 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001381 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382 hash = n >> 32;
1383 export = n & ((1LL<<32) - 1);
1384
1385
1386 for (ch=export_table[hash]; ch; ch=ch->next)
1387 if (!export--)
1388 return ch;
1389 n &= ~((1LL<<32) - 1);
1390 do {
1391 hash++;
1392 n += 1LL<<32;
1393 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1394 if (hash >= EXPORT_HASHMAX)
1395 return NULL;
1396 *pos = n+1;
1397 return export_table[hash];
1398}
1399
1400static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1401{
1402 struct cache_head *ch = p;
1403 int hash = (*pos >> 32);
1404
Greg Banksbc6f02e2006-10-02 02:17:49 -07001405 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406 hash = 0;
1407 else if (ch->next == NULL) {
1408 hash++;
1409 *pos += 1LL<<32;
1410 } else {
1411 ++*pos;
1412 return ch->next;
1413 }
1414 *pos &= ~((1LL<<32) - 1);
1415 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1416 hash++;
1417 *pos += 1LL<<32;
1418 }
1419 if (hash >= EXPORT_HASHMAX)
1420 return NULL;
1421 ++*pos;
1422 return export_table[hash];
1423}
1424
1425static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001426 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001427{
1428 read_unlock(&svc_export_cache.hash_lock);
1429 exp_readunlock();
1430}
1431
1432static struct flags {
1433 int flag;
1434 char *name[2];
1435} expflags[] = {
1436 { NFSEXP_READONLY, {"ro", "rw"}},
1437 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1438 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1439 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1440 { NFSEXP_ASYNC, {"async", "sync"}},
1441 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1442 { NFSEXP_NOHIDE, {"nohide", ""}},
1443 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1444 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1445 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
Steve Dicksoneb4c86c2009-09-09 14:58:22 -04001446 { NFSEXP_V4ROOT, {"v4root", ""}},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447#ifdef MSNFS
1448 { NFSEXP_MSNFS, {"msnfs", ""}},
1449#endif
1450 { 0, {"", ""}}
1451};
1452
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001453static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001456 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001457
1458 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001459 if (flg->flag & ~mask)
1460 continue;
1461 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001462 if (*flg->name[state])
1463 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1464 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001465}
1466
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001467static void show_secinfo_flags(struct seq_file *m, int flags)
1468{
1469 seq_printf(m, ",");
1470 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1471}
1472
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001473static bool secinfo_flags_equal(int f, int g)
1474{
1475 f &= NFSEXP_SECINFO_FLAGS;
1476 g &= NFSEXP_SECINFO_FLAGS;
1477 return f == g;
1478}
1479
1480static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1481{
1482 int flags;
1483
1484 flags = (*fp)->flags;
1485 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1486 (*fp)++;
1487 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1488 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1489 (*fp)++;
1490 }
1491 return flags;
1492}
1493
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001494static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1495{
1496 struct exp_flavor_info *f;
1497 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001498 int flags;
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001499
1500 if (exp->ex_nflavors == 0)
1501 return;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001502 f = exp->ex_flavors;
1503 flags = show_secinfo_run(m, &f, end);
1504 if (!secinfo_flags_equal(flags, exp->ex_flags))
1505 show_secinfo_flags(m, flags);
1506 while (f != end) {
1507 flags = show_secinfo_run(m, &f, end);
1508 show_secinfo_flags(m, flags);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001509 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001510}
1511
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001512static void exp_flags(struct seq_file *m, int flag, int fsid,
1513 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1514{
1515 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001517 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001519 seq_printf(m, ",anonuid=%u", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001521 seq_printf(m, ",anongid=%u", anong);
Manoj Naik93346912006-10-04 02:16:18 -07001522 if (fsloc && fsloc->locations_count > 0) {
1523 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1524 int i;
1525
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001526 seq_printf(m, ",%s=", loctype);
Manoj Naik93346912006-10-04 02:16:18 -07001527 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1528 seq_putc(m, '@');
1529 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1530 for (i = 1; i < fsloc->locations_count; i++) {
1531 seq_putc(m, ';');
1532 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1533 seq_putc(m, '@');
1534 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1535 }
1536 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537}
1538
1539static int e_show(struct seq_file *m, void *p)
1540{
1541 struct cache_head *cp = p;
1542 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001543
Greg Banksbc6f02e2006-10-02 02:17:49 -07001544 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 seq_puts(m, "# Version 1.1\n");
1546 seq_puts(m, "# Path Client(Flags) # IPs\n");
1547 return 0;
1548 }
1549
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 cache_get(&exp->h);
1551 if (cache_check(&svc_export_cache, &exp->h, NULL))
1552 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001553 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 return svc_export_show(m, &svc_export_cache, cp);
1555}
1556
James Morris88e9d342009-09-22 16:43:43 -07001557const struct seq_operations nfs_exports_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558 .start = e_start,
1559 .next = e_next,
1560 .stop = e_stop,
1561 .show = e_show,
1562};
1563
NeilBrown1e140562010-09-22 12:55:07 +10001564#ifdef CONFIG_NFSD_DEPRECATED
Linus Torvalds1da177e2005-04-16 15:20:36 -07001565/*
1566 * Add or modify a client.
1567 * Change requests may involve the list of host addresses. The list of
1568 * exports and possibly existing uid maps are left untouched.
1569 */
1570int
1571exp_addclient(struct nfsctl_client *ncp)
1572{
1573 struct auth_domain *dom;
1574 int i, err;
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001575 struct in6_addr addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001576
1577 /* First, consistency check. */
1578 err = -EINVAL;
1579 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1580 goto out;
1581 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1582 goto out;
1583
1584 /* Lock the hashtable */
1585 exp_writelock();
1586
1587 dom = unix_domain_find(ncp->cl_ident);
1588
1589 err = -ENOMEM;
1590 if (!dom)
1591 goto out_unlock;
1592
1593 /* Insert client into hashtable. */
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001594 for (i = 0; i < ncp->cl_naddr; i++) {
1595 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1596 auth_unix_add_addr(&addr6, dom);
1597 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001598 auth_unix_forget_old(dom);
1599 auth_domain_put(dom);
1600
1601 err = 0;
1602
1603out_unlock:
1604 exp_writeunlock();
1605out:
1606 return err;
1607}
1608
1609/*
1610 * Delete a client given an identifier.
1611 */
1612int
1613exp_delclient(struct nfsctl_client *ncp)
1614{
1615 int err;
1616 struct auth_domain *dom;
1617
1618 err = -EINVAL;
1619 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1620 goto out;
1621
1622 /* Lock the hashtable */
1623 exp_writelock();
1624
1625 dom = auth_domain_find(ncp->cl_ident);
1626 /* just make sure that no addresses work
1627 * and that it will expire soon
1628 */
1629 if (dom) {
1630 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001631 auth_domain_put(dom);
1632 }
1633
1634 exp_writeunlock();
1635out:
1636 return err;
1637}
1638
1639/*
1640 * Verify that string is non-empty and does not exceed max length.
1641 */
1642static int
1643exp_verify_string(char *cp, int max)
1644{
1645 int i;
1646
1647 for (i = 0; i < max; i++)
1648 if (!cp[i])
1649 return i;
1650 cp[i] = 0;
1651 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1652 return 0;
1653}
NeilBrown1e140562010-09-22 12:55:07 +10001654#endif /* CONFIG_NFSD_DEPRECATED */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001655
1656/*
1657 * Initialize the exports module.
1658 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001659int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001660nfsd_export_init(void)
1661{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001662 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001663 dprintk("nfsd: initializing export module.\n");
1664
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001665 rv = cache_register(&svc_export_cache);
1666 if (rv)
1667 return rv;
1668 rv = cache_register(&svc_expkey_cache);
1669 if (rv)
1670 cache_unregister(&svc_export_cache);
1671 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001672
1673}
1674
1675/*
1676 * Flush exports table - called when last nfsd thread is killed
1677 */
1678void
1679nfsd_export_flush(void)
1680{
1681 exp_writelock();
1682 cache_purge(&svc_expkey_cache);
1683 cache_purge(&svc_export_cache);
1684 exp_writeunlock();
1685}
1686
1687/*
1688 * Shutdown the exports module.
1689 */
1690void
1691nfsd_export_shutdown(void)
1692{
1693
1694 dprintk("nfsd: shutting down export module.\n");
1695
1696 exp_writelock();
1697
J. Bruce Fieldsdf95a9d2007-11-08 16:09:59 -05001698 cache_unregister(&svc_expkey_cache);
1699 cache_unregister(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001700 svcauth_unix_purge();
1701
1702 exp_writeunlock();
1703 dprintk("nfsd: export shutdown complete.\n");
1704}