blob: 8b31e5f8795de8fb520e5f1a0676b60c93530c01 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Linus Torvalds1da177e2005-04-16 15:20:36 -07002 * NFS exporting and validation.
3 *
4 * We maintain a list of clients, each of which has a list of
5 * exports. To export an fs to a given client, you first have
6 * to create the client entry with NFSCTL_ADDCLIENT, which
7 * creates a client control block and adds it to the hash
8 * table. Then, you call NFSCTL_EXPORT for each fs.
9 *
10 *
11 * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de>
12 */
13
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090014#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/namei.h>
Bruce Allanf35279d2005-09-06 15:17:08 -070016#include <linux/module.h>
Christoph Hellwiga5694252007-07-17 04:04:28 -070017#include <linux/exportfs.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/nfsd/syscall.h>
Aurélien Charbonf15364b2008-01-18 15:50:56 +010020#include <net/ipv6.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
Boaz Harrosh9a74af22009-12-03 20:30:56 +020022#include "nfsd.h"
J. Bruce Fields1557aca2009-12-04 19:36:06 -050023#include "nfsfh.h"
Boaz Harrosh9a74af22009-12-03 20:30:56 +020024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#define NFSDDBG_FACILITY NFSDDBG_EXPORT
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
27typedef struct auth_domain svc_client;
28typedef struct svc_export svc_export;
29
Linus Torvalds1da177e2005-04-16 15:20:36 -070030/*
31 * We have two caches.
32 * One maps client+vfsmnt+dentry to export options - the export map
33 * The other maps client+filehandle-fragment to export options. - the expkey map
34 *
35 * The export options are actually stored in the first map, and the
36 * second map contains a reference to the entry in the first map.
37 */
38
39#define EXPKEY_HASHBITS 8
40#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
41#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
42static struct cache_head *expkey_table[EXPKEY_HASHMAX];
43
Adrian Bunk74cae612006-03-27 01:15:10 -080044static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070045{
NeilBrownbaab9352006-03-27 01:15:09 -080046 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
47
48 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080049 !test_bit(CACHE_NEGATIVE, &key->h.flags))
50 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080051 auth_domain_put(key->ek_client);
52 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053}
54
55static void expkey_request(struct cache_detail *cd,
56 struct cache_head *h,
57 char **bpp, int *blen)
58{
59 /* client fsidtype \xfsid */
60 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
61 char type[5];
62
63 qword_add(bpp, blen, ek->ek_client->name);
64 snprintf(type, 5, "%d", ek->ek_fsidtype);
65 qword_add(bpp, blen, type);
66 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
67 (*bpp)[-1] = '\n';
68}
69
Trond Myklebustbc74b4f2009-08-09 15:14:29 -040070static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
71{
72 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
73}
74
NeilBrown8d270f7f2006-03-27 01:15:04 -080075static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
76static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080077static struct cache_detail svc_expkey_cache;
78
Linus Torvalds1da177e2005-04-16 15:20:36 -070079static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
80{
81 /* client fsidtype fsid [path] */
82 char *buf;
83 int len;
84 struct auth_domain *dom = NULL;
85 int err;
86 int fsidtype;
87 char *ep;
88 struct svc_expkey key;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040089 struct svc_expkey *ek = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 if (mesg[mlen-1] != '\n')
92 return -EINVAL;
93 mesg[mlen-1] = 0;
94
95 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
96 err = -ENOMEM;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040097 if (!buf)
98 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
100 err = -EINVAL;
101 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
102 goto out;
103
104 err = -ENOENT;
105 dom = auth_domain_find(buf);
106 if (!dom)
107 goto out;
108 dprintk("found domain %s\n", buf);
109
110 err = -EINVAL;
111 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
112 goto out;
113 fsidtype = simple_strtoul(buf, &ep, 10);
114 if (*ep)
115 goto out;
116 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700117 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 goto out;
119 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
120 goto out;
121 dprintk("found fsid length %d\n", len);
122 if (len != key_len(fsidtype))
123 goto out;
124
125 /* OK, we seem to have a valid key */
126 key.h.flags = 0;
127 key.h.expiry_time = get_expiry(&mesg);
128 if (key.h.expiry_time == 0)
129 goto out;
130
131 key.ek_client = dom;
132 key.ek_fsidtype = fsidtype;
133 memcpy(key.ek_fsid, buf, len);
134
NeilBrown8d270f7f2006-03-27 01:15:04 -0800135 ek = svc_expkey_lookup(&key);
136 err = -ENOMEM;
137 if (!ek)
138 goto out;
139
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f7f2006-03-27 01:15:04 -0800141 err = -EINVAL;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400142 len = qword_get(&mesg, buf, PAGE_SIZE);
143 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 goto out;
145 dprintk("Path seems to be <%s>\n", buf);
146 err = 0;
147 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800149 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400150 if (!ek)
151 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 } else {
Al Viroa63bb992008-08-02 01:03:36 -0400153 err = kern_path(buf, 0, &key.ek_path);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400154 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 goto out;
156
157 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800158
NeilBrown8d270f7f2006-03-27 01:15:04 -0800159 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400160 if (!ek)
NeilBrown8d270f7f2006-03-27 01:15:04 -0800161 err = -ENOMEM;
Al Viroa63bb992008-08-02 01:03:36 -0400162 path_put(&key.ek_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 }
164 cache_flush();
165 out:
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400166 if (ek)
167 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 if (dom)
169 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800170 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 return err;
172}
173
174static int expkey_show(struct seq_file *m,
175 struct cache_detail *cd,
176 struct cache_head *h)
177{
178 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800179 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181 if (h ==NULL) {
182 seq_puts(m, "#domain fsidtype fsid [path]\n");
183 return 0;
184 }
185 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800186 seq_printf(m, "%s %d 0x", ek->ek_client->name,
187 ek->ek_fsidtype);
188 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
189 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 if (test_bit(CACHE_VALID, &h->flags) &&
191 !test_bit(CACHE_NEGATIVE, &h->flags)) {
192 seq_printf(m, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800193 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 }
195 seq_printf(m, "\n");
196 return 0;
197}
NeilBrown8d270f7f2006-03-27 01:15:04 -0800198
199static inline int expkey_match (struct cache_head *a, struct cache_head *b)
200{
201 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
202 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
203
204 if (orig->ek_fsidtype != new->ek_fsidtype ||
205 orig->ek_client != new->ek_client ||
206 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
207 return 0;
208 return 1;
209}
210
211static inline void expkey_init(struct cache_head *cnew,
212 struct cache_head *citem)
213{
214 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
215 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
216
217 kref_get(&item->ek_client->ref);
218 new->ek_client = item->ek_client;
219 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800220
221 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f7f2006-03-27 01:15:04 -0800222}
223
224static inline void expkey_update(struct cache_head *cnew,
225 struct cache_head *citem)
226{
227 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
228 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
229
Jan Bluncke83aece2008-02-14 19:38:41 -0800230 new->ek_path = item->ek_path;
231 path_get(&item->ek_path);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800232}
233
234static struct cache_head *expkey_alloc(void)
235{
236 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
237 if (i)
238 return &i->h;
239 else
240 return NULL;
241}
242
Adrian Bunk74cae612006-03-27 01:15:10 -0800243static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700244 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 .hash_size = EXPKEY_HASHMAX,
246 .hash_table = expkey_table,
247 .name = "nfsd.fh",
248 .cache_put = expkey_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400249 .cache_upcall = expkey_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 .cache_parse = expkey_parse,
251 .cache_show = expkey_show,
NeilBrown8d270f7f2006-03-27 01:15:04 -0800252 .match = expkey_match,
253 .init = expkey_init,
254 .update = expkey_update,
255 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256};
257
NeilBrown61f86032010-02-03 17:31:31 +1100258static int
259svc_expkey_hash(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800261 int hash = item->ek_fsidtype;
262 char * cp = (char*)item->ek_fsid;
263 int len = key_len(item->ek_fsidtype);
264
265 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
266 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
267 hash &= EXPKEY_HASHMASK;
NeilBrown61f86032010-02-03 17:31:31 +1100268 return hash;
269}
270
271static struct svc_expkey *
272svc_expkey_lookup(struct svc_expkey *item)
273{
274 struct cache_head *ch;
275 int hash = svc_expkey_hash(item);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800276
277 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
278 hash);
279 if (ch)
280 return container_of(ch, struct svc_expkey, h);
281 else
282 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
NeilBrown8d270f7f2006-03-27 01:15:04 -0800285static struct svc_expkey *
286svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800288 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100289 int hash = svc_expkey_hash(new);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800290
291 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
292 &old->h, hash);
293 if (ch)
294 return container_of(ch, struct svc_expkey, h);
295 else
296 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297}
298
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
300#define EXPORT_HASHBITS 8
301#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
302#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
303
304static struct cache_head *export_table[EXPORT_HASHMAX];
305
Manoj Naik933469192006-10-04 02:16:18 -0700306static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
307{
308 int i;
309
310 for (i = 0; i < fsloc->locations_count; i++) {
311 kfree(fsloc->locations[i].path);
312 kfree(fsloc->locations[i].hosts);
313 }
314 kfree(fsloc->locations);
315}
316
NeilBrownbaab9352006-03-27 01:15:09 -0800317static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
NeilBrownbaab9352006-03-27 01:15:09 -0800319 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
Jan Blunck54775492008-02-14 19:38:39 -0800320 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800321 auth_domain_put(exp->ex_client);
Jan Blunck54775492008-02-14 19:38:39 -0800322 kfree(exp->ex_pathname);
Manoj Naik933469192006-10-04 02:16:18 -0700323 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800324 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325}
326
327static void svc_export_request(struct cache_detail *cd,
328 struct cache_head *h,
329 char **bpp, int *blen)
330{
331 /* client path */
332 struct svc_export *exp = container_of(h, struct svc_export, h);
333 char *pth;
334
335 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunckcf28b482008-02-14 19:38:44 -0800336 pth = d_path(&exp->ex_path, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 if (IS_ERR(pth)) {
338 /* is this correct? */
339 (*bpp)[0] = '\n';
340 return;
341 }
342 qword_add(bpp, blen, pth);
343 (*bpp)[-1] = '\n';
344}
345
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400346static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
347{
348 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
349}
350
Adrian Bunk74cae612006-03-27 01:15:10 -0800351static struct svc_export *svc_export_update(struct svc_export *new,
352 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800353static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354
J. Bruce Fields774b1472009-12-13 20:21:48 -0500355static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356{
357
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500358 /*
359 * We currently export only dirs, regular files, and (for v4
360 * pseudoroot) symlinks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 */
362 if (!S_ISDIR(inode->i_mode) &&
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500363 !S_ISLNK(inode->i_mode) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 !S_ISREG(inode->i_mode))
365 return -ENOTDIR;
366
J. Bruce Fields774b1472009-12-13 20:21:48 -0500367 /*
368 * Mountd should never pass down a writeable V4ROOT export, but,
369 * just to make sure:
370 */
371 if (*flags & NFSEXP_V4ROOT)
372 *flags |= NFSEXP_READONLY;
373
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 /* There are two requirements on a filesystem to be exportable.
375 * 1: We must be able to identify the filesystem from a number.
376 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800377 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 * 2: We must be able to find an inode from a filehandle.
379 * This means that s_export_op must be set.
380 */
381 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
J. Bruce Fields774b1472009-12-13 20:21:48 -0500382 !(*flags & NFSEXP_FSID) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800383 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700384 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 return -EINVAL;
386 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700387
388 if (!inode->i_sb->s_export_op ||
389 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 dprintk("exp_export: export of invalid fs type.\n");
391 return -EINVAL;
392 }
393
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 return 0;
395
396}
397
Manoj Naik933469192006-10-04 02:16:18 -0700398#ifdef CONFIG_NFSD_V4
399
400static int
401fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
402{
403 int len;
404 int migrated, i, err;
405
Manoj Naik933469192006-10-04 02:16:18 -0700406 /* listsize */
407 err = get_int(mesg, &fsloc->locations_count);
408 if (err)
409 return err;
410 if (fsloc->locations_count > MAX_FS_LOCATIONS)
411 return -EINVAL;
412 if (fsloc->locations_count == 0)
413 return 0;
414
415 fsloc->locations = kzalloc(fsloc->locations_count
416 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
417 if (!fsloc->locations)
418 return -ENOMEM;
419 for (i=0; i < fsloc->locations_count; i++) {
420 /* colon separated host list */
421 err = -EINVAL;
422 len = qword_get(mesg, buf, PAGE_SIZE);
423 if (len <= 0)
424 goto out_free_all;
425 err = -ENOMEM;
426 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
427 if (!fsloc->locations[i].hosts)
428 goto out_free_all;
429 err = -EINVAL;
430 /* slash separated path component list */
431 len = qword_get(mesg, buf, PAGE_SIZE);
432 if (len <= 0)
433 goto out_free_all;
434 err = -ENOMEM;
435 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
436 if (!fsloc->locations[i].path)
437 goto out_free_all;
438 }
439 /* migrated */
440 err = get_int(mesg, &migrated);
441 if (err)
442 goto out_free_all;
443 err = -EINVAL;
444 if (migrated < 0 || migrated > 1)
445 goto out_free_all;
446 fsloc->migrated = migrated;
447 return 0;
448out_free_all:
449 nfsd4_fslocs_free(fsloc);
450 return err;
451}
452
Andy Adamsone677bfe2007-07-17 04:04:42 -0700453static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
454{
455 int listsize, err;
456 struct exp_flavor_info *f;
457
458 err = get_int(mesg, &listsize);
459 if (err)
460 return err;
461 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
462 return -EINVAL;
463
464 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
465 err = get_int(mesg, &f->pseudoflavor);
466 if (err)
467 return err;
468 /*
Roel Kluin80492e72009-04-21 16:08:39 +0200469 * XXX: It would be nice to also check whether this
470 * pseudoflavor is supported, so we can discover the
471 * problem at export time instead of when a client fails
472 * to authenticate.
Andy Adamsone677bfe2007-07-17 04:04:42 -0700473 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700474 err = get_int(mesg, &f->flags);
475 if (err)
476 return err;
477 /* Only some flags are allowed to differ between flavors: */
478 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
479 return -EINVAL;
480 }
481 exp->ex_nflavors = listsize;
482 return 0;
483}
484
Manoj Naik933469192006-10-04 02:16:18 -0700485#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700486static inline int
487fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
488static inline int
489secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik933469192006-10-04 02:16:18 -0700490#endif
491
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
493{
494 /* client path expiry [flags anonuid anongid fsid] */
495 char *buf;
496 int len;
497 int err;
498 struct auth_domain *dom = NULL;
Al Viroc1a2a472008-08-02 01:01:02 -0400499 struct svc_export exp = {}, *expp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 int an_int;
501
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502 if (mesg[mlen-1] != '\n')
503 return -EINVAL;
504 mesg[mlen-1] = 0;
505
506 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Al Viroc1a2a472008-08-02 01:01:02 -0400507 if (!buf)
508 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510 /* client */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400512 len = qword_get(&mesg, buf, PAGE_SIZE);
513 if (len <= 0)
514 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515
516 err = -ENOENT;
517 dom = auth_domain_find(buf);
518 if (!dom)
519 goto out;
520
521 /* path */
522 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400523 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
524 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Al Viroc1a2a472008-08-02 01:01:02 -0400526 err = kern_path(buf, 0, &exp.ex_path);
527 if (err)
528 goto out1;
529
Linus Torvalds1da177e2005-04-16 15:20:36 -0700530 exp.ex_client = dom;
Al Viroc1a2a472008-08-02 01:01:02 -0400531
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700532 err = -ENOMEM;
Al Viroc1a2a472008-08-02 01:01:02 -0400533 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
Jan Blunck54775492008-02-14 19:38:39 -0800534 if (!exp.ex_pathname)
Al Viroc1a2a472008-08-02 01:01:02 -0400535 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537 /* expiry */
538 err = -EINVAL;
539 exp.h.expiry_time = get_expiry(&mesg);
540 if (exp.h.expiry_time == 0)
Al Viroc1a2a472008-08-02 01:01:02 -0400541 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542
543 /* flags */
544 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700545 if (err == -ENOENT) {
546 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700548 } else {
Al Viroc1a2a472008-08-02 01:01:02 -0400549 if (err || an_int < 0)
550 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 exp.ex_flags= an_int;
552
553 /* anon uid */
554 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400555 if (err)
556 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557 exp.ex_anon_uid= an_int;
558
559 /* anon gid */
560 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400561 if (err)
562 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 exp.ex_anon_gid= an_int;
564
565 /* fsid */
566 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400567 if (err)
568 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 exp.ex_fsid = an_int;
570
NeilBrownaf6a4e22007-02-14 00:33:12 -0800571 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
572 if (strcmp(buf, "fsloc") == 0)
573 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
574 else if (strcmp(buf, "uuid") == 0) {
575 /* expect a 16 byte uuid encoded as \xXXXX... */
576 len = qword_get(&mesg, buf, PAGE_SIZE);
577 if (len != 16)
578 err = -EINVAL;
579 else {
580 exp.ex_uuid =
581 kmemdup(buf, 16, GFP_KERNEL);
582 if (exp.ex_uuid == NULL)
583 err = -ENOMEM;
584 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700585 } else if (strcmp(buf, "secinfo") == 0)
586 err = secinfo_parse(&mesg, buf, &exp);
587 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800588 /* quietly ignore unknown words and anything
589 * following. Newer user-space can try to set
590 * new values, then see what the result was.
591 */
592 break;
593 if (err)
Al Viroc1a2a472008-08-02 01:01:02 -0400594 goto out4;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800595 }
Manoj Naik933469192006-10-04 02:16:18 -0700596
J. Bruce Fields774b1472009-12-13 20:21:48 -0500597 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800598 exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400599 if (err)
600 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 }
602
NeilBrown4f7774c2006-03-27 01:15:03 -0800603 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800605 expp = svc_export_update(&exp, expp);
606 else
607 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800609 if (expp == NULL)
610 err = -ENOMEM;
611 else
612 exp_put(expp);
Al Viroc1a2a472008-08-02 01:01:02 -0400613out4:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800614 nfsd4_fslocs_free(&exp.ex_fslocs);
615 kfree(exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400616out3:
Jan Blunck54775492008-02-14 19:38:39 -0800617 kfree(exp.ex_pathname);
Al Viroc1a2a472008-08-02 01:01:02 -0400618out2:
619 path_put(&exp.ex_path);
620out1:
621 auth_domain_put(dom);
622out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800623 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 return err;
625}
626
Manoj Naik933469192006-10-04 02:16:18 -0700627static void exp_flags(struct seq_file *m, int flag, int fsid,
628 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700629static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
631static int svc_export_show(struct seq_file *m,
632 struct cache_detail *cd,
633 struct cache_head *h)
634{
635 struct svc_export *exp ;
636
637 if (h ==NULL) {
638 seq_puts(m, "#path domain(flags)\n");
639 return 0;
640 }
641 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800642 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 seq_putc(m, '\t');
644 seq_escape(m, exp->ex_client->name, " \t\n\\");
645 seq_putc(m, '(');
646 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800647 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700648 exp_flags(m, exp->ex_flags, exp->ex_fsid,
649 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800650 if (exp->ex_uuid) {
651 int i;
652 seq_puts(m, ",uuid=");
653 for (i=0; i<16; i++) {
654 if ((i&3) == 0 && i)
655 seq_putc(m, ':');
656 seq_printf(m, "%02x", exp->ex_uuid[i]);
657 }
658 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700659 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800660 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661 seq_puts(m, ")\n");
662 return 0;
663}
NeilBrown4f7774c2006-03-27 01:15:03 -0800664static int svc_export_match(struct cache_head *a, struct cache_head *b)
665{
666 struct svc_export *orig = container_of(a, struct svc_export, h);
667 struct svc_export *new = container_of(b, struct svc_export, h);
668 return orig->ex_client == new->ex_client &&
Jan Blunck54775492008-02-14 19:38:39 -0800669 orig->ex_path.dentry == new->ex_path.dentry &&
670 orig->ex_path.mnt == new->ex_path.mnt;
NeilBrown4f7774c2006-03-27 01:15:03 -0800671}
672
673static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
674{
675 struct svc_export *new = container_of(cnew, struct svc_export, h);
676 struct svc_export *item = container_of(citem, struct svc_export, h);
677
678 kref_get(&item->ex_client->ref);
679 new->ex_client = item->ex_client;
Jan Blunck54775492008-02-14 19:38:39 -0800680 new->ex_path.dentry = dget(item->ex_path.dentry);
681 new->ex_path.mnt = mntget(item->ex_path.mnt);
682 new->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700683 new->ex_fslocs.locations = NULL;
684 new->ex_fslocs.locations_count = 0;
685 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800686}
687
688static void export_update(struct cache_head *cnew, struct cache_head *citem)
689{
690 struct svc_export *new = container_of(cnew, struct svc_export, h);
691 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700692 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800693
694 new->ex_flags = item->ex_flags;
695 new->ex_anon_uid = item->ex_anon_uid;
696 new->ex_anon_gid = item->ex_anon_gid;
697 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800698 new->ex_uuid = item->ex_uuid;
699 item->ex_uuid = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800700 new->ex_pathname = item->ex_pathname;
701 item->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700702 new->ex_fslocs.locations = item->ex_fslocs.locations;
703 item->ex_fslocs.locations = NULL;
704 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
705 item->ex_fslocs.locations_count = 0;
706 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
707 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700708 new->ex_nflavors = item->ex_nflavors;
709 for (i = 0; i < MAX_SECINFO_LIST; i++) {
710 new->ex_flavors[i] = item->ex_flavors[i];
711 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800712}
713
714static struct cache_head *svc_export_alloc(void)
715{
716 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
717 if (i)
718 return &i->h;
719 else
720 return NULL;
721}
722
Linus Torvalds1da177e2005-04-16 15:20:36 -0700723struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700724 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 .hash_size = EXPORT_HASHMAX,
726 .hash_table = export_table,
727 .name = "nfsd.export",
728 .cache_put = svc_export_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400729 .cache_upcall = svc_export_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730 .cache_parse = svc_export_parse,
731 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800732 .match = svc_export_match,
733 .init = svc_export_init,
734 .update = export_update,
735 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700736};
737
NeilBrown61f86032010-02-03 17:31:31 +1100738static int
739svc_export_hash(struct svc_export *exp)
740{
741 int hash;
742
743 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
744 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
745 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
746 return hash;
747}
748
NeilBrown4f7774c2006-03-27 01:15:03 -0800749static struct svc_export *
750svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751{
NeilBrown4f7774c2006-03-27 01:15:03 -0800752 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100753 int hash = svc_export_hash(exp);
NeilBrown4f7774c2006-03-27 01:15:03 -0800754
755 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
756 hash);
757 if (ch)
758 return container_of(ch, struct svc_export, h);
759 else
760 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761}
762
Adrian Bunk74cae612006-03-27 01:15:10 -0800763static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800764svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765{
NeilBrown4f7774c2006-03-27 01:15:03 -0800766 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100767 int hash = svc_export_hash(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768
NeilBrown4f7774c2006-03-27 01:15:03 -0800769 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
770 &old->h,
771 hash);
772 if (ch)
773 return container_of(ch, struct svc_export, h);
774 else
775 return NULL;
776}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700777
778
Adrian Bunk74cae612006-03-27 01:15:10 -0800779static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
781{
782 struct svc_expkey key, *ek;
783 int err;
784
785 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700786 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787
788 key.ek_client = clp;
789 key.ek_fsidtype = fsid_type;
790 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
791
NeilBrown8d270f7f2006-03-27 01:15:04 -0800792 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700793 if (ek == NULL)
794 return ERR_PTR(-ENOMEM);
795 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
796 if (err)
797 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 return ek;
799}
800
NeilBrown1e140562010-09-22 12:55:07 +1000801#ifdef CONFIG_NFSD_DEPRECATED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
803 struct svc_export *exp)
804{
805 struct svc_expkey key, *ek;
806
807 key.ek_client = clp;
808 key.ek_fsidtype = fsid_type;
809 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
Jan Bluncke83aece2008-02-14 19:38:41 -0800810 key.ek_path = exp->ex_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 key.h.expiry_time = NEVER;
812 key.h.flags = 0;
813
NeilBrown8d270f7f2006-03-27 01:15:04 -0800814 ek = svc_expkey_lookup(&key);
815 if (ek)
816 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800818 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 return 0;
820 }
821 return -ENOMEM;
822}
823
824/*
825 * Find the client's export entry matching xdev/xino.
826 */
827static inline struct svc_expkey *
828exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
829{
830 u32 fsidv[3];
831
832 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800833 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
834 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800836 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
837 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838}
839
840/*
841 * Find the client's export entry matching fsid
842 */
843static inline struct svc_expkey *
844exp_get_fsid_key(svc_client *clp, int fsid)
845{
846 u32 fsidv[2];
847
NeilBrownaf6a4e22007-02-14 00:33:12 -0800848 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849
NeilBrownaf6a4e22007-02-14 00:33:12 -0800850 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851}
NeilBrown1e140562010-09-22 12:55:07 +1000852#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
Al Viro55430e22009-04-18 02:04:46 -0400854static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
855 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856{
857 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700858 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700861 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862
863 key.ex_client = clp;
Al Viro55430e22009-04-18 02:04:46 -0400864 key.ex_path = *path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865
NeilBrown4f7774c2006-03-27 01:15:03 -0800866 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700867 if (exp == NULL)
868 return ERR_PTR(-ENOMEM);
869 err = cache_check(&svc_export_cache, &exp->h, reqp);
870 if (err)
871 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 return exp;
873}
874
875/*
876 * Find the export entry for a given dentry.
877 */
Al Viro5bf3bd22009-04-18 02:14:32 -0400878static struct svc_export *exp_parent(svc_client *clp, struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879{
Al Viro5bf3bd22009-04-18 02:14:32 -0400880 struct dentry *saved = dget(path->dentry);
881 svc_export *exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882
Al Viro5bf3bd22009-04-18 02:14:32 -0400883 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
884 struct dentry *parent = dget_parent(path->dentry);
885 dput(path->dentry);
886 path->dentry = parent;
887 exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888 }
Al Viro5bf3bd22009-04-18 02:14:32 -0400889 dput(path->dentry);
890 path->dentry = saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 return exp;
892}
893
NeilBrown1e140562010-09-22 12:55:07 +1000894#ifdef CONFIG_NFSD_DEPRECATED
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895/*
896 * Hashtable locking. Write locks are placed only by user processes
897 * wanting to modify export information.
898 * Write locking only done in this file. Read locking
899 * needed externally.
900 */
901
902static DECLARE_RWSEM(hash_sem);
903
904void
905exp_readlock(void)
906{
907 down_read(&hash_sem);
908}
909
910static inline void
911exp_writelock(void)
912{
913 down_write(&hash_sem);
914}
915
916void
917exp_readunlock(void)
918{
919 up_read(&hash_sem);
920}
921
922static inline void
923exp_writeunlock(void)
924{
925 up_write(&hash_sem);
926}
NeilBrown1e140562010-09-22 12:55:07 +1000927#else
928
929/* hash_sem not needed once deprecated interface is removed */
930void exp_readlock(void) {}
931static inline void exp_writelock(void){}
932void exp_readunlock(void) {}
933static inline void exp_writeunlock(void){}
934
935#endif
936
937#ifdef CONFIG_NFSD_DEPRECATED
938static void exp_do_unexport(svc_export *unexp);
939static int exp_verify_string(char *cp, int max);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940
941static void exp_fsid_unhash(struct svc_export *exp)
942{
943 struct svc_expkey *ek;
944
945 if ((exp->ex_flags & NFSEXP_FSID) == 0)
946 return;
947
948 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700949 if (!IS_ERR(ek)) {
NeilBrown17cebf62010-08-12 16:55:22 +1000950 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
NeilBrownbaab9352006-03-27 01:15:09 -0800951 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954
955static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
956{
957 u32 fsid[2];
958
959 if ((exp->ex_flags & NFSEXP_FSID) == 0)
960 return 0;
961
NeilBrownaf6a4e22007-02-14 00:33:12 -0800962 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
963 return exp_set_key(clp, FSID_NUM, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964}
965
966static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
967{
968 u32 fsid[2];
Jan Blunck54775492008-02-14 19:38:39 -0800969 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970 dev_t dev = inode->i_sb->s_dev;
971
972 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800973 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
974 return exp_set_key(clp, FSID_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700975 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800976 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
977 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978}
979
980static void exp_unhash(struct svc_export *exp)
981{
982 struct svc_expkey *ek;
Jan Blunck54775492008-02-14 19:38:39 -0800983 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984
985 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700986 if (!IS_ERR(ek)) {
NeilBrown17cebf62010-08-12 16:55:22 +1000987 sunrpc_invalidate(&ek->h, &svc_expkey_cache);
NeilBrownbaab9352006-03-27 01:15:09 -0800988 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990}
991
992/*
993 * Export a file system.
994 */
995int
996exp_export(struct nfsctl_export *nxp)
997{
998 svc_client *clp;
999 struct svc_export *exp = NULL;
1000 struct svc_export new;
1001 struct svc_expkey *fsid_key = NULL;
Al Viroa63bb992008-08-02 01:03:36 -04001002 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003 int err;
1004
1005 /* Consistency check */
1006 err = -EINVAL;
1007 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1008 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1009 goto out;
1010
1011 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1012 nxp->ex_client, nxp->ex_path,
1013 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1014 nxp->ex_flags);
1015
1016 /* Try to lock the export table for update */
1017 exp_writelock();
1018
1019 /* Look up client info */
1020 if (!(clp = auth_domain_find(nxp->ex_client)))
1021 goto out_unlock;
1022
1023
1024 /* Look up the dentry */
Al Viroa63bb992008-08-02 01:03:36 -04001025 err = kern_path(nxp->ex_path, 0, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 if (err)
Julia Lawall53e6d8d2008-07-25 22:08:09 +02001027 goto out_put_clp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 err = -EINVAL;
1029
Al Viro55430e22009-04-18 02:04:46 -04001030 exp = exp_get_by_name(clp, &path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001031
NeilBrownf9884432006-12-13 00:35:45 -08001032 memset(&new, 0, sizeof(new));
1033
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 /* must make sure there won't be an ex_fsid clash */
1035 if ((nxp->ex_flags & NFSEXP_FSID) &&
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001036 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
Jan Bluncke83aece2008-02-14 19:38:41 -08001037 fsid_key->ek_path.mnt &&
Al Viroa63bb992008-08-02 01:03:36 -04001038 (fsid_key->ek_path.mnt != path.mnt ||
1039 fsid_key->ek_path.dentry != path.dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 goto finish;
1041
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001042 if (!IS_ERR(exp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 /* just a flags/id/fsid update */
1044
1045 exp_fsid_unhash(exp);
1046 exp->ex_flags = nxp->ex_flags;
1047 exp->ex_anon_uid = nxp->ex_anon_uid;
1048 exp->ex_anon_gid = nxp->ex_anon_gid;
1049 exp->ex_fsid = nxp->ex_dev;
1050
1051 err = exp_fsid_hash(clp, exp);
1052 goto finish;
1053 }
1054
J. Bruce Fields774b1472009-12-13 20:21:48 -05001055 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001056 if (err) goto finish;
1057
1058 err = -ENOMEM;
1059
1060 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1061
1062 new.h.expiry_time = NEVER;
1063 new.h.flags = 0;
Jan Blunck54775492008-02-14 19:38:39 -08001064 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1065 if (!new.ex_pathname)
NeilBrownf9884432006-12-13 00:35:45 -08001066 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067 new.ex_client = clp;
Al Viroa63bb992008-08-02 01:03:36 -04001068 new.ex_path = path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 new.ex_flags = nxp->ex_flags;
1070 new.ex_anon_uid = nxp->ex_anon_uid;
1071 new.ex_anon_gid = nxp->ex_anon_gid;
1072 new.ex_fsid = nxp->ex_dev;
1073
NeilBrown4f7774c2006-03-27 01:15:03 -08001074 exp = svc_export_lookup(&new);
1075 if (exp)
1076 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077
NeilBrown4f7774c2006-03-27 01:15:03 -08001078 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001079 goto finish;
1080
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 if (exp_hash(clp, exp) ||
1082 exp_fsid_hash(clp, exp)) {
1083 /* failed to create at least one index */
1084 exp_do_unexport(exp);
1085 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001086 } else
1087 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001088finish:
Jan Blunck54775492008-02-14 19:38:39 -08001089 kfree(new.ex_pathname);
Dan Carpenterd03859a2010-04-22 11:30:59 +02001090 if (!IS_ERR_OR_NULL(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 exp_put(exp);
Dan Carpenterd03859a2010-04-22 11:30:59 +02001092 if (!IS_ERR_OR_NULL(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001093 cache_put(&fsid_key->h, &svc_expkey_cache);
Al Viroa63bb992008-08-02 01:03:36 -04001094 path_put(&path);
Julia Lawall53e6d8d2008-07-25 22:08:09 +02001095out_put_clp:
1096 auth_domain_put(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097out_unlock:
1098 exp_writeunlock();
1099out:
1100 return err;
1101}
1102
1103/*
1104 * Unexport a file system. The export entry has already
1105 * been removed from the client's list of exported fs's.
1106 */
1107static void
1108exp_do_unexport(svc_export *unexp)
1109{
NeilBrown17cebf62010-08-12 16:55:22 +10001110 sunrpc_invalidate(&unexp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001111 exp_unhash(unexp);
1112 exp_fsid_unhash(unexp);
1113}
1114
1115
1116/*
1117 * unexport syscall.
1118 */
1119int
1120exp_unexport(struct nfsctl_export *nxp)
1121{
1122 struct auth_domain *dom;
1123 svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -04001124 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001125 int err;
1126
1127 /* Consistency check */
1128 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1129 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1130 return -EINVAL;
1131
1132 exp_writelock();
1133
1134 err = -EINVAL;
1135 dom = auth_domain_find(nxp->ex_client);
1136 if (!dom) {
1137 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1138 goto out_unlock;
1139 }
1140
Al Viroa63bb992008-08-02 01:03:36 -04001141 err = kern_path(nxp->ex_path, 0, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001142 if (err)
1143 goto out_domain;
1144
1145 err = -EINVAL;
Al Viro55430e22009-04-18 02:04:46 -04001146 exp = exp_get_by_name(dom, &path, NULL);
Al Viroa63bb992008-08-02 01:03:36 -04001147 path_put(&path);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001148 if (IS_ERR(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001149 goto out_domain;
1150
1151 exp_do_unexport(exp);
1152 exp_put(exp);
1153 err = 0;
1154
1155out_domain:
1156 auth_domain_put(dom);
1157 cache_flush();
1158out_unlock:
1159 exp_writeunlock();
1160 return err;
1161}
NeilBrown1e140562010-09-22 12:55:07 +10001162#endif /* CONFIG_NFSD_DEPRECATED */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163
1164/*
1165 * Obtain the root fh on behalf of a client.
1166 * This could be done in user space, but I feel that it adds some safety
1167 * since its harder to fool a kernel module than a user space program.
1168 */
1169int
Al Viroa63bb992008-08-02 01:03:36 -04001170exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171{
1172 struct svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -04001173 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001174 struct inode *inode;
1175 struct svc_fh fh;
1176 int err;
1177
1178 err = -EPERM;
1179 /* NB: we probably ought to check that it's NUL-terminated */
Al Viroa63bb992008-08-02 01:03:36 -04001180 if (kern_path(name, 0, &path)) {
1181 printk("nfsd: exp_rootfh path not found %s", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182 return err;
1183 }
Al Viroa63bb992008-08-02 01:03:36 -04001184 inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001185
1186 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Al Viroa63bb992008-08-02 01:03:36 -04001187 name, path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 inode->i_sb->s_id, inode->i_ino);
Al Viro5bf3bd22009-04-18 02:14:32 -04001189 exp = exp_parent(clp, &path);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001190 if (IS_ERR(exp)) {
1191 err = PTR_ERR(exp);
1192 goto out;
1193 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001194
1195 /*
1196 * fh must be initialized before calling fh_compose
1197 */
1198 fh_init(&fh, maxsize);
Al Viroa63bb992008-08-02 01:03:36 -04001199 if (fh_compose(&fh, exp, path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001200 err = -EINVAL;
1201 else
1202 err = 0;
1203 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1204 fh_put(&fh);
1205 exp_put(exp);
1206out:
Al Viroa63bb992008-08-02 01:03:36 -04001207 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001208 return err;
1209}
1210
Adrian Bunkcce76f92007-10-16 01:27:52 -07001211static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1212 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -08001213{
1214 struct svc_export *exp;
1215 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001216 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -08001217 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001218
Al Viro55430e22009-04-18 02:04:46 -04001219 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001220 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001221
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001222 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -08001223 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001224 return exp;
1225}
1226
Andy Adamson32c1eb02007-07-17 04:04:48 -07001227__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1228{
1229 struct exp_flavor_info *f;
1230 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1231
1232 /* legacy gss-only clients are always OK: */
1233 if (exp->ex_client == rqstp->rq_gssclient)
1234 return 0;
1235 /* ip-address based client; check sec= export option: */
1236 for (f = exp->ex_flavors; f < end; f++) {
1237 if (f->pseudoflavor == rqstp->rq_flavor)
1238 return 0;
1239 }
1240 /* defaults in absence of sec= options: */
1241 if (exp->ex_nflavors == 0) {
1242 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1243 rqstp->rq_flavor == RPC_AUTH_UNIX)
1244 return 0;
1245 }
1246 return nfserr_wrongsec;
1247}
1248
J. Bruce Fields0989a782007-07-17 04:04:44 -07001249/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001250 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1251 * auth_unix client) if it's available and has secinfo information;
1252 * otherwise, will try to use rq_gssclient.
1253 *
J. Bruce Fields0989a782007-07-17 04:04:44 -07001254 * Called from functions that handle requests; functions that do work on
1255 * behalf of mountd are passed a single client name to use, and should
1256 * use exp_get_by_name() or exp_find().
1257 */
1258struct svc_export *
Al Viro91c9fa82009-04-18 02:42:05 -04001259rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -07001260{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001261 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001262
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001263 if (rqstp->rq_client == NULL)
1264 goto gss;
1265
1266 /* First try the auth_unix client: */
Al Viro91c9fa82009-04-18 02:42:05 -04001267 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001268 if (PTR_ERR(exp) == -ENOENT)
1269 goto gss;
1270 if (IS_ERR(exp))
1271 return exp;
1272 /* If it has secinfo, assume there are no gss/... clients */
1273 if (exp->ex_nflavors > 0)
1274 return exp;
1275gss:
1276 /* Otherwise, try falling back on gss client */
1277 if (rqstp->rq_gssclient == NULL)
1278 return exp;
Al Viro91c9fa82009-04-18 02:42:05 -04001279 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001280 if (PTR_ERR(gssexp) == -ENOENT)
1281 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001282 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001283 exp_put(exp);
1284 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001285}
1286
1287struct svc_export *
1288rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1289{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001290 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001291
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001292 if (rqstp->rq_client == NULL)
1293 goto gss;
1294
1295 /* First try the auth_unix client: */
1296 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1297 if (PTR_ERR(exp) == -ENOENT)
1298 goto gss;
1299 if (IS_ERR(exp))
1300 return exp;
1301 /* If it has secinfo, assume there are no gss/... clients */
1302 if (exp->ex_nflavors > 0)
1303 return exp;
1304gss:
1305 /* Otherwise, try falling back on gss client */
1306 if (rqstp->rq_gssclient == NULL)
1307 return exp;
1308 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1309 &rqstp->rq_chandle);
1310 if (PTR_ERR(gssexp) == -ENOENT)
1311 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001312 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001313 exp_put(exp);
1314 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001315}
1316
1317struct svc_export *
Al Viroe64c3902009-04-18 03:00:46 -04001318rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -07001319{
Al Viroe64c3902009-04-18 03:00:46 -04001320 struct dentry *saved = dget(path->dentry);
1321 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001322
Al Viroe64c3902009-04-18 03:00:46 -04001323 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1324 struct dentry *parent = dget_parent(path->dentry);
1325 dput(path->dentry);
1326 path->dentry = parent;
1327 exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001328 }
Al Viroe64c3902009-04-18 03:00:46 -04001329 dput(path->dentry);
1330 path->dentry = saved;
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001331 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001332}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001333
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001334static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1335{
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001336 u32 fsidv[2];
1337
1338 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1339
J. Bruce Fields260c64d2010-02-08 13:42:26 -05001340 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001341}
1342
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343/*
1344 * Called when we need the filehandle for the root of the pseudofs,
1345 * for a given NFSv4 client. The root is defined to be the
1346 * export point with fsid==0
1347 */
Al Viroc7afef12006-10-19 23:29:02 -07001348__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001349exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001351 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001352 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001354 exp = find_fsidzero_export(rqstp);
J.Bruce Fields68993202006-12-13 00:35:23 -08001355 if (IS_ERR(exp))
1356 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001357 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001358 if (rv)
1359 goto out;
1360 rv = check_nfsd_access(exp, rqstp);
Trond Myklebust2671a4b2009-09-02 16:48:32 -04001361 if (rv)
1362 fh_put(fhp);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001363out:
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001364 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 return rv;
1366}
1367
1368/* Iterator */
1369
1370static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001371 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001372{
1373 loff_t n = *pos;
1374 unsigned hash, export;
1375 struct cache_head *ch;
1376
1377 exp_readlock();
1378 read_lock(&svc_export_cache.hash_lock);
1379 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001380 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 hash = n >> 32;
1382 export = n & ((1LL<<32) - 1);
1383
1384
1385 for (ch=export_table[hash]; ch; ch=ch->next)
1386 if (!export--)
1387 return ch;
1388 n &= ~((1LL<<32) - 1);
1389 do {
1390 hash++;
1391 n += 1LL<<32;
1392 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1393 if (hash >= EXPORT_HASHMAX)
1394 return NULL;
1395 *pos = n+1;
1396 return export_table[hash];
1397}
1398
1399static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1400{
1401 struct cache_head *ch = p;
1402 int hash = (*pos >> 32);
1403
Greg Banksbc6f02e2006-10-02 02:17:49 -07001404 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405 hash = 0;
1406 else if (ch->next == NULL) {
1407 hash++;
1408 *pos += 1LL<<32;
1409 } else {
1410 ++*pos;
1411 return ch->next;
1412 }
1413 *pos &= ~((1LL<<32) - 1);
1414 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1415 hash++;
1416 *pos += 1LL<<32;
1417 }
1418 if (hash >= EXPORT_HASHMAX)
1419 return NULL;
1420 ++*pos;
1421 return export_table[hash];
1422}
1423
1424static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001425 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426{
1427 read_unlock(&svc_export_cache.hash_lock);
1428 exp_readunlock();
1429}
1430
1431static struct flags {
1432 int flag;
1433 char *name[2];
1434} expflags[] = {
1435 { NFSEXP_READONLY, {"ro", "rw"}},
1436 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1437 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1438 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1439 { NFSEXP_ASYNC, {"async", "sync"}},
1440 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1441 { NFSEXP_NOHIDE, {"nohide", ""}},
1442 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1443 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1444 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
Steve Dicksoneb4c86c2009-09-09 14:58:22 -04001445 { NFSEXP_V4ROOT, {"v4root", ""}},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446 { 0, {"", ""}}
1447};
1448
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001449static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001452 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001453
1454 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001455 if (flg->flag & ~mask)
1456 continue;
1457 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458 if (*flg->name[state])
1459 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1460 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001461}
1462
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001463static void show_secinfo_flags(struct seq_file *m, int flags)
1464{
1465 seq_printf(m, ",");
1466 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1467}
1468
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001469static bool secinfo_flags_equal(int f, int g)
1470{
1471 f &= NFSEXP_SECINFO_FLAGS;
1472 g &= NFSEXP_SECINFO_FLAGS;
1473 return f == g;
1474}
1475
1476static int show_secinfo_run(struct seq_file *m, struct exp_flavor_info **fp, struct exp_flavor_info *end)
1477{
1478 int flags;
1479
1480 flags = (*fp)->flags;
1481 seq_printf(m, ",sec=%d", (*fp)->pseudoflavor);
1482 (*fp)++;
1483 while (*fp != end && secinfo_flags_equal(flags, (*fp)->flags)) {
1484 seq_printf(m, ":%d", (*fp)->pseudoflavor);
1485 (*fp)++;
1486 }
1487 return flags;
1488}
1489
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001490static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1491{
1492 struct exp_flavor_info *f;
1493 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001494 int flags;
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001495
1496 if (exp->ex_nflavors == 0)
1497 return;
J. Bruce Fields74ec1e12010-09-24 17:43:59 -04001498 f = exp->ex_flavors;
1499 flags = show_secinfo_run(m, &f, end);
1500 if (!secinfo_flags_equal(flags, exp->ex_flags))
1501 show_secinfo_flags(m, flags);
1502 while (f != end) {
1503 flags = show_secinfo_run(m, &f, end);
1504 show_secinfo_flags(m, flags);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001505 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001506}
1507
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001508static void exp_flags(struct seq_file *m, int flag, int fsid,
1509 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1510{
1511 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001513 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001515 seq_printf(m, ",anonuid=%u", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001517 seq_printf(m, ",anongid=%u", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001518 if (fsloc && fsloc->locations_count > 0) {
1519 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1520 int i;
1521
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001522 seq_printf(m, ",%s=", loctype);
Manoj Naik933469192006-10-04 02:16:18 -07001523 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1524 seq_putc(m, '@');
1525 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1526 for (i = 1; i < fsloc->locations_count; i++) {
1527 seq_putc(m, ';');
1528 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1529 seq_putc(m, '@');
1530 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1531 }
1532 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001533}
1534
1535static int e_show(struct seq_file *m, void *p)
1536{
1537 struct cache_head *cp = p;
1538 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539
Greg Banksbc6f02e2006-10-02 02:17:49 -07001540 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 seq_puts(m, "# Version 1.1\n");
1542 seq_puts(m, "# Path Client(Flags) # IPs\n");
1543 return 0;
1544 }
1545
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546 cache_get(&exp->h);
1547 if (cache_check(&svc_export_cache, &exp->h, NULL))
1548 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001549 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550 return svc_export_show(m, &svc_export_cache, cp);
1551}
1552
James Morris88e9d342009-09-22 16:43:43 -07001553const struct seq_operations nfs_exports_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001554 .start = e_start,
1555 .next = e_next,
1556 .stop = e_stop,
1557 .show = e_show,
1558};
1559
NeilBrown1e140562010-09-22 12:55:07 +10001560#ifdef CONFIG_NFSD_DEPRECATED
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561/*
1562 * Add or modify a client.
1563 * Change requests may involve the list of host addresses. The list of
1564 * exports and possibly existing uid maps are left untouched.
1565 */
1566int
1567exp_addclient(struct nfsctl_client *ncp)
1568{
1569 struct auth_domain *dom;
1570 int i, err;
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001571 struct in6_addr addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001572
1573 /* First, consistency check. */
1574 err = -EINVAL;
1575 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1576 goto out;
1577 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1578 goto out;
1579
1580 /* Lock the hashtable */
1581 exp_writelock();
1582
1583 dom = unix_domain_find(ncp->cl_ident);
1584
1585 err = -ENOMEM;
1586 if (!dom)
1587 goto out_unlock;
1588
1589 /* Insert client into hashtable. */
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001590 for (i = 0; i < ncp->cl_naddr; i++) {
1591 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
Pavel Emelyanov352114f2010-09-27 13:59:48 +04001592 auth_unix_add_addr(&init_net, &addr6, dom);
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001593 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001594 auth_unix_forget_old(dom);
1595 auth_domain_put(dom);
1596
1597 err = 0;
1598
1599out_unlock:
1600 exp_writeunlock();
1601out:
1602 return err;
1603}
1604
1605/*
1606 * Delete a client given an identifier.
1607 */
1608int
1609exp_delclient(struct nfsctl_client *ncp)
1610{
1611 int err;
1612 struct auth_domain *dom;
1613
1614 err = -EINVAL;
1615 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1616 goto out;
1617
1618 /* Lock the hashtable */
1619 exp_writelock();
1620
1621 dom = auth_domain_find(ncp->cl_ident);
1622 /* just make sure that no addresses work
1623 * and that it will expire soon
1624 */
1625 if (dom) {
1626 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001627 auth_domain_put(dom);
1628 }
1629
1630 exp_writeunlock();
1631out:
1632 return err;
1633}
1634
1635/*
1636 * Verify that string is non-empty and does not exceed max length.
1637 */
1638static int
1639exp_verify_string(char *cp, int max)
1640{
1641 int i;
1642
1643 for (i = 0; i < max; i++)
1644 if (!cp[i])
1645 return i;
1646 cp[i] = 0;
1647 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1648 return 0;
1649}
NeilBrown1e140562010-09-22 12:55:07 +10001650#endif /* CONFIG_NFSD_DEPRECATED */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001651
1652/*
1653 * Initialize the exports module.
1654 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001655int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001656nfsd_export_init(void)
1657{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001658 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001659 dprintk("nfsd: initializing export module.\n");
1660
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001661 rv = cache_register(&svc_export_cache);
1662 if (rv)
1663 return rv;
1664 rv = cache_register(&svc_expkey_cache);
1665 if (rv)
1666 cache_unregister(&svc_export_cache);
1667 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001668
1669}
1670
1671/*
1672 * Flush exports table - called when last nfsd thread is killed
1673 */
1674void
1675nfsd_export_flush(void)
1676{
1677 exp_writelock();
1678 cache_purge(&svc_expkey_cache);
1679 cache_purge(&svc_export_cache);
1680 exp_writeunlock();
1681}
1682
1683/*
1684 * Shutdown the exports module.
1685 */
1686void
1687nfsd_export_shutdown(void)
1688{
1689
1690 dprintk("nfsd: shutting down export module.\n");
1691
1692 exp_writelock();
1693
J. Bruce Fieldsdf95a9d2007-11-08 16:09:59 -05001694 cache_unregister(&svc_expkey_cache);
1695 cache_unregister(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001696 svcauth_unix_purge();
1697
1698 exp_writeunlock();
1699 dprintk("nfsd: export shutdown complete.\n");
1700}