blob: c2a4f71d87dd507a99d20564cff85ff15bd91646 [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
31static void exp_do_unexport(svc_export *unexp);
32static int exp_verify_string(char *cp, int max);
33
34/*
35 * We have two caches.
36 * One maps client+vfsmnt+dentry to export options - the export map
37 * The other maps client+filehandle-fragment to export options. - the expkey map
38 *
39 * The export options are actually stored in the first map, and the
40 * second map contains a reference to the entry in the first map.
41 */
42
43#define EXPKEY_HASHBITS 8
44#define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS)
45#define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1)
46static struct cache_head *expkey_table[EXPKEY_HASHMAX];
47
Adrian Bunk74cae612006-03-27 01:15:10 -080048static void expkey_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
NeilBrownbaab9352006-03-27 01:15:09 -080050 struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
51
52 if (test_bit(CACHE_VALID, &key->h.flags) &&
Jan Bluncke83aece2008-02-14 19:38:41 -080053 !test_bit(CACHE_NEGATIVE, &key->h.flags))
54 path_put(&key->ek_path);
NeilBrownbaab9352006-03-27 01:15:09 -080055 auth_domain_put(key->ek_client);
56 kfree(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057}
58
59static void expkey_request(struct cache_detail *cd,
60 struct cache_head *h,
61 char **bpp, int *blen)
62{
63 /* client fsidtype \xfsid */
64 struct svc_expkey *ek = container_of(h, struct svc_expkey, h);
65 char type[5];
66
67 qword_add(bpp, blen, ek->ek_client->name);
68 snprintf(type, 5, "%d", ek->ek_fsidtype);
69 qword_add(bpp, blen, type);
70 qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype));
71 (*bpp)[-1] = '\n';
72}
73
Trond Myklebustbc74b4f2009-08-09 15:14:29 -040074static int expkey_upcall(struct cache_detail *cd, struct cache_head *h)
75{
76 return sunrpc_cache_pipe_upcall(cd, h, expkey_request);
77}
78
NeilBrown8d270f7f2006-03-27 01:15:04 -080079static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
80static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
Adrian Bunk74cae612006-03-27 01:15:10 -080081static struct cache_detail svc_expkey_cache;
82
Linus Torvalds1da177e2005-04-16 15:20:36 -070083static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
84{
85 /* client fsidtype fsid [path] */
86 char *buf;
87 int len;
88 struct auth_domain *dom = NULL;
89 int err;
90 int fsidtype;
91 char *ep;
92 struct svc_expkey key;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -040093 struct svc_expkey *ek = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 if (mesg[mlen-1] != '\n')
96 return -EINVAL;
97 mesg[mlen-1] = 0;
98
99 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
100 err = -ENOMEM;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400101 if (!buf)
102 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103
104 err = -EINVAL;
105 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
106 goto out;
107
108 err = -ENOENT;
109 dom = auth_domain_find(buf);
110 if (!dom)
111 goto out;
112 dprintk("found domain %s\n", buf);
113
114 err = -EINVAL;
115 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
116 goto out;
117 fsidtype = simple_strtoul(buf, &ep, 10);
118 if (*ep)
119 goto out;
120 dprintk("found fsidtype %d\n", fsidtype);
Frank Filz4bdff8c2006-06-30 01:56:11 -0700121 if (key_len(fsidtype)==0) /* invalid type */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 goto out;
123 if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
124 goto out;
125 dprintk("found fsid length %d\n", len);
126 if (len != key_len(fsidtype))
127 goto out;
128
129 /* OK, we seem to have a valid key */
130 key.h.flags = 0;
131 key.h.expiry_time = get_expiry(&mesg);
132 if (key.h.expiry_time == 0)
133 goto out;
134
135 key.ek_client = dom;
136 key.ek_fsidtype = fsidtype;
137 memcpy(key.ek_fsid, buf, len);
138
NeilBrown8d270f7f2006-03-27 01:15:04 -0800139 ek = svc_expkey_lookup(&key);
140 err = -ENOMEM;
141 if (!ek)
142 goto out;
143
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 /* now we want a pathname, or empty meaning NEGATIVE */
NeilBrown8d270f7f2006-03-27 01:15:04 -0800145 err = -EINVAL;
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400146 len = qword_get(&mesg, buf, PAGE_SIZE);
147 if (len < 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 goto out;
149 dprintk("Path seems to be <%s>\n", buf);
150 err = 0;
151 if (len == 0) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 set_bit(CACHE_NEGATIVE, &key.h.flags);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800153 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400154 if (!ek)
155 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 } else {
Al Viroa63bb992008-08-02 01:03:36 -0400157 err = kern_path(buf, 0, &key.ek_path);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400158 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 goto out;
160
161 dprintk("Found the path %s\n", buf);
Jan Bluncke83aece2008-02-14 19:38:41 -0800162
NeilBrown8d270f7f2006-03-27 01:15:04 -0800163 ek = svc_expkey_update(&key, ek);
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400164 if (!ek)
NeilBrown8d270f7f2006-03-27 01:15:04 -0800165 err = -ENOMEM;
Al Viroa63bb992008-08-02 01:03:36 -0400166 path_put(&key.ek_path);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 }
168 cache_flush();
169 out:
J. Bruce Fields30bc4df2008-10-20 16:34:21 -0400170 if (ek)
171 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172 if (dom)
173 auth_domain_put(dom);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800174 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return err;
176}
177
178static int expkey_show(struct seq_file *m,
179 struct cache_detail *cd,
180 struct cache_head *h)
181{
182 struct svc_expkey *ek ;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800183 int i;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
185 if (h ==NULL) {
186 seq_puts(m, "#domain fsidtype fsid [path]\n");
187 return 0;
188 }
189 ek = container_of(h, struct svc_expkey, h);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800190 seq_printf(m, "%s %d 0x", ek->ek_client->name,
191 ek->ek_fsidtype);
192 for (i=0; i < key_len(ek->ek_fsidtype)/4; i++)
193 seq_printf(m, "%08x", ek->ek_fsid[i]);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 if (test_bit(CACHE_VALID, &h->flags) &&
195 !test_bit(CACHE_NEGATIVE, &h->flags)) {
196 seq_printf(m, " ");
Jan Blunckc32c2f62008-02-14 19:38:43 -0800197 seq_path(m, &ek->ek_path, "\\ \t\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198 }
199 seq_printf(m, "\n");
200 return 0;
201}
NeilBrown8d270f7f2006-03-27 01:15:04 -0800202
203static inline int expkey_match (struct cache_head *a, struct cache_head *b)
204{
205 struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
206 struct svc_expkey *new = container_of(b, struct svc_expkey, h);
207
208 if (orig->ek_fsidtype != new->ek_fsidtype ||
209 orig->ek_client != new->ek_client ||
210 memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
211 return 0;
212 return 1;
213}
214
215static inline void expkey_init(struct cache_head *cnew,
216 struct cache_head *citem)
217{
218 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
219 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
220
221 kref_get(&item->ek_client->ref);
222 new->ek_client = item->ek_client;
223 new->ek_fsidtype = item->ek_fsidtype;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800224
225 memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid));
NeilBrown8d270f7f2006-03-27 01:15:04 -0800226}
227
228static inline void expkey_update(struct cache_head *cnew,
229 struct cache_head *citem)
230{
231 struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
232 struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
233
Jan Bluncke83aece2008-02-14 19:38:41 -0800234 new->ek_path = item->ek_path;
235 path_get(&item->ek_path);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800236}
237
238static struct cache_head *expkey_alloc(void)
239{
240 struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
241 if (i)
242 return &i->h;
243 else
244 return NULL;
245}
246
Adrian Bunk74cae612006-03-27 01:15:10 -0800247static struct cache_detail svc_expkey_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700248 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 .hash_size = EXPKEY_HASHMAX,
250 .hash_table = expkey_table,
251 .name = "nfsd.fh",
252 .cache_put = expkey_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400253 .cache_upcall = expkey_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 .cache_parse = expkey_parse,
255 .cache_show = expkey_show,
NeilBrown8d270f7f2006-03-27 01:15:04 -0800256 .match = expkey_match,
257 .init = expkey_init,
258 .update = expkey_update,
259 .alloc = expkey_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260};
261
NeilBrown61f86032010-02-03 17:31:31 +1100262static int
263svc_expkey_hash(struct svc_expkey *item)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800265 int hash = item->ek_fsidtype;
266 char * cp = (char*)item->ek_fsid;
267 int len = key_len(item->ek_fsidtype);
268
269 hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
270 hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
271 hash &= EXPKEY_HASHMASK;
NeilBrown61f86032010-02-03 17:31:31 +1100272 return hash;
273}
274
275static struct svc_expkey *
276svc_expkey_lookup(struct svc_expkey *item)
277{
278 struct cache_head *ch;
279 int hash = svc_expkey_hash(item);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800280
281 ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
282 hash);
283 if (ch)
284 return container_of(ch, struct svc_expkey, h);
285 else
286 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
NeilBrown8d270f7f2006-03-27 01:15:04 -0800289static struct svc_expkey *
290svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291{
NeilBrown8d270f7f2006-03-27 01:15:04 -0800292 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100293 int hash = svc_expkey_hash(new);
NeilBrown8d270f7f2006-03-27 01:15:04 -0800294
295 ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
296 &old->h, hash);
297 if (ch)
298 return container_of(ch, struct svc_expkey, h);
299 else
300 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301}
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304#define EXPORT_HASHBITS 8
305#define EXPORT_HASHMAX (1<< EXPORT_HASHBITS)
306#define EXPORT_HASHMASK (EXPORT_HASHMAX -1)
307
308static struct cache_head *export_table[EXPORT_HASHMAX];
309
Manoj Naik933469192006-10-04 02:16:18 -0700310static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc)
311{
312 int i;
313
314 for (i = 0; i < fsloc->locations_count; i++) {
315 kfree(fsloc->locations[i].path);
316 kfree(fsloc->locations[i].hosts);
317 }
318 kfree(fsloc->locations);
319}
320
NeilBrownbaab9352006-03-27 01:15:09 -0800321static void svc_export_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322{
NeilBrownbaab9352006-03-27 01:15:09 -0800323 struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
Jan Blunck54775492008-02-14 19:38:39 -0800324 path_put(&exp->ex_path);
NeilBrownbaab9352006-03-27 01:15:09 -0800325 auth_domain_put(exp->ex_client);
Jan Blunck54775492008-02-14 19:38:39 -0800326 kfree(exp->ex_pathname);
Manoj Naik933469192006-10-04 02:16:18 -0700327 nfsd4_fslocs_free(&exp->ex_fslocs);
NeilBrownbaab9352006-03-27 01:15:09 -0800328 kfree(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329}
330
331static void svc_export_request(struct cache_detail *cd,
332 struct cache_head *h,
333 char **bpp, int *blen)
334{
335 /* client path */
336 struct svc_export *exp = container_of(h, struct svc_export, h);
337 char *pth;
338
339 qword_add(bpp, blen, exp->ex_client->name);
Jan Blunckcf28b482008-02-14 19:38:44 -0800340 pth = d_path(&exp->ex_path, *bpp, *blen);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 if (IS_ERR(pth)) {
342 /* is this correct? */
343 (*bpp)[0] = '\n';
344 return;
345 }
346 qword_add(bpp, blen, pth);
347 (*bpp)[-1] = '\n';
348}
349
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400350static int svc_export_upcall(struct cache_detail *cd, struct cache_head *h)
351{
352 return sunrpc_cache_pipe_upcall(cd, h, svc_export_request);
353}
354
Adrian Bunk74cae612006-03-27 01:15:10 -0800355static struct svc_export *svc_export_update(struct svc_export *new,
356 struct svc_export *old);
NeilBrown4f7774c2006-03-27 01:15:03 -0800357static struct svc_export *svc_export_lookup(struct svc_export *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
J. Bruce Fields774b1472009-12-13 20:21:48 -0500359static int check_export(struct inode *inode, int *flags, unsigned char *uuid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360{
361
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500362 /*
363 * We currently export only dirs, regular files, and (for v4
364 * pseudoroot) symlinks.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 */
366 if (!S_ISDIR(inode->i_mode) &&
J. Bruce Fieldsf2ca7152009-11-12 17:26:19 -0500367 !S_ISLNK(inode->i_mode) &&
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 !S_ISREG(inode->i_mode))
369 return -ENOTDIR;
370
J. Bruce Fields774b1472009-12-13 20:21:48 -0500371 /*
372 * Mountd should never pass down a writeable V4ROOT export, but,
373 * just to make sure:
374 */
375 if (*flags & NFSEXP_V4ROOT)
376 *flags |= NFSEXP_READONLY;
377
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 /* There are two requirements on a filesystem to be exportable.
379 * 1: We must be able to identify the filesystem from a number.
380 * either a device number (so FS_REQUIRES_DEV needed)
NeilBrownaf6a4e22007-02-14 00:33:12 -0800381 * or an FSID number (so NFSEXP_FSID or ->uuid is needed).
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 * 2: We must be able to find an inode from a filehandle.
383 * This means that s_export_op must be set.
384 */
385 if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) &&
J. Bruce Fields774b1472009-12-13 20:21:48 -0500386 !(*flags & NFSEXP_FSID) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800387 uuid == NULL) {
Greg Banks3e3b4802006-10-02 02:17:41 -0700388 dprintk("exp_export: export of non-dev fs without fsid\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 return -EINVAL;
390 }
Christoph Hellwigcfaea782007-10-21 16:42:16 -0700391
392 if (!inode->i_sb->s_export_op ||
393 !inode->i_sb->s_export_op->fh_to_dentry) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 dprintk("exp_export: export of invalid fs type.\n");
395 return -EINVAL;
396 }
397
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398 return 0;
399
400}
401
Manoj Naik933469192006-10-04 02:16:18 -0700402#ifdef CONFIG_NFSD_V4
403
404static int
405fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc)
406{
407 int len;
408 int migrated, i, err;
409
Manoj Naik933469192006-10-04 02:16:18 -0700410 /* listsize */
411 err = get_int(mesg, &fsloc->locations_count);
412 if (err)
413 return err;
414 if (fsloc->locations_count > MAX_FS_LOCATIONS)
415 return -EINVAL;
416 if (fsloc->locations_count == 0)
417 return 0;
418
419 fsloc->locations = kzalloc(fsloc->locations_count
420 * sizeof(struct nfsd4_fs_location), GFP_KERNEL);
421 if (!fsloc->locations)
422 return -ENOMEM;
423 for (i=0; i < fsloc->locations_count; i++) {
424 /* colon separated host list */
425 err = -EINVAL;
426 len = qword_get(mesg, buf, PAGE_SIZE);
427 if (len <= 0)
428 goto out_free_all;
429 err = -ENOMEM;
430 fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL);
431 if (!fsloc->locations[i].hosts)
432 goto out_free_all;
433 err = -EINVAL;
434 /* slash separated path component list */
435 len = qword_get(mesg, buf, PAGE_SIZE);
436 if (len <= 0)
437 goto out_free_all;
438 err = -ENOMEM;
439 fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL);
440 if (!fsloc->locations[i].path)
441 goto out_free_all;
442 }
443 /* migrated */
444 err = get_int(mesg, &migrated);
445 if (err)
446 goto out_free_all;
447 err = -EINVAL;
448 if (migrated < 0 || migrated > 1)
449 goto out_free_all;
450 fsloc->migrated = migrated;
451 return 0;
452out_free_all:
453 nfsd4_fslocs_free(fsloc);
454 return err;
455}
456
Andy Adamsone677bfe2007-07-17 04:04:42 -0700457static int secinfo_parse(char **mesg, char *buf, struct svc_export *exp)
458{
459 int listsize, err;
460 struct exp_flavor_info *f;
461
462 err = get_int(mesg, &listsize);
463 if (err)
464 return err;
465 if (listsize < 0 || listsize > MAX_SECINFO_LIST)
466 return -EINVAL;
467
468 for (f = exp->ex_flavors; f < exp->ex_flavors + listsize; f++) {
469 err = get_int(mesg, &f->pseudoflavor);
470 if (err)
471 return err;
472 /*
Roel Kluin80492e72009-04-21 16:08:39 +0200473 * XXX: It would be nice to also check whether this
474 * pseudoflavor is supported, so we can discover the
475 * problem at export time instead of when a client fails
476 * to authenticate.
Andy Adamsone677bfe2007-07-17 04:04:42 -0700477 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700478 err = get_int(mesg, &f->flags);
479 if (err)
480 return err;
481 /* Only some flags are allowed to differ between flavors: */
482 if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags))
483 return -EINVAL;
484 }
485 exp->ex_nflavors = listsize;
486 return 0;
487}
488
Manoj Naik933469192006-10-04 02:16:18 -0700489#else /* CONFIG_NFSD_V4 */
Andy Adamsone677bfe2007-07-17 04:04:42 -0700490static inline int
491fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;}
492static inline int
493secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; }
Manoj Naik933469192006-10-04 02:16:18 -0700494#endif
495
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
497{
498 /* client path expiry [flags anonuid anongid fsid] */
499 char *buf;
500 int len;
501 int err;
502 struct auth_domain *dom = NULL;
Al Viroc1a2a472008-08-02 01:01:02 -0400503 struct svc_export exp = {}, *expp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 int an_int;
505
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 if (mesg[mlen-1] != '\n')
507 return -EINVAL;
508 mesg[mlen-1] = 0;
509
510 buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
Al Viroc1a2a472008-08-02 01:01:02 -0400511 if (!buf)
512 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513
514 /* client */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700515 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400516 len = qword_get(&mesg, buf, PAGE_SIZE);
517 if (len <= 0)
518 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519
520 err = -ENOENT;
521 dom = auth_domain_find(buf);
522 if (!dom)
523 goto out;
524
525 /* path */
526 err = -EINVAL;
Al Viroc1a2a472008-08-02 01:01:02 -0400527 if ((len = qword_get(&mesg, buf, PAGE_SIZE)) <= 0)
528 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
Al Viroc1a2a472008-08-02 01:01:02 -0400530 err = kern_path(buf, 0, &exp.ex_path);
531 if (err)
532 goto out1;
533
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 exp.ex_client = dom;
Al Viroc1a2a472008-08-02 01:01:02 -0400535
J.Bruce Fieldsb009a872006-10-04 02:16:17 -0700536 err = -ENOMEM;
Al Viroc1a2a472008-08-02 01:01:02 -0400537 exp.ex_pathname = kstrdup(buf, GFP_KERNEL);
Jan Blunck54775492008-02-14 19:38:39 -0800538 if (!exp.ex_pathname)
Al Viroc1a2a472008-08-02 01:01:02 -0400539 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540
541 /* expiry */
542 err = -EINVAL;
543 exp.h.expiry_time = get_expiry(&mesg);
544 if (exp.h.expiry_time == 0)
Al Viroc1a2a472008-08-02 01:01:02 -0400545 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546
547 /* flags */
548 err = get_int(&mesg, &an_int);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700549 if (err == -ENOENT) {
550 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 set_bit(CACHE_NEGATIVE, &exp.h.flags);
J. Bruce Fields4a4b8832007-07-31 00:37:53 -0700552 } else {
Al Viroc1a2a472008-08-02 01:01:02 -0400553 if (err || an_int < 0)
554 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 exp.ex_flags= an_int;
556
557 /* anon uid */
558 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400559 if (err)
560 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 exp.ex_anon_uid= an_int;
562
563 /* anon gid */
564 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400565 if (err)
566 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567 exp.ex_anon_gid= an_int;
568
569 /* fsid */
570 err = get_int(&mesg, &an_int);
Al Viroc1a2a472008-08-02 01:01:02 -0400571 if (err)
572 goto out3;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 exp.ex_fsid = an_int;
574
NeilBrownaf6a4e22007-02-14 00:33:12 -0800575 while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) {
576 if (strcmp(buf, "fsloc") == 0)
577 err = fsloc_parse(&mesg, buf, &exp.ex_fslocs);
578 else if (strcmp(buf, "uuid") == 0) {
579 /* expect a 16 byte uuid encoded as \xXXXX... */
580 len = qword_get(&mesg, buf, PAGE_SIZE);
581 if (len != 16)
582 err = -EINVAL;
583 else {
584 exp.ex_uuid =
585 kmemdup(buf, 16, GFP_KERNEL);
586 if (exp.ex_uuid == NULL)
587 err = -ENOMEM;
588 }
Andy Adamsone677bfe2007-07-17 04:04:42 -0700589 } else if (strcmp(buf, "secinfo") == 0)
590 err = secinfo_parse(&mesg, buf, &exp);
591 else
NeilBrownaf6a4e22007-02-14 00:33:12 -0800592 /* quietly ignore unknown words and anything
593 * following. Newer user-space can try to set
594 * new values, then see what the result was.
595 */
596 break;
597 if (err)
Al Viroc1a2a472008-08-02 01:01:02 -0400598 goto out4;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800599 }
Manoj Naik933469192006-10-04 02:16:18 -0700600
J. Bruce Fields774b1472009-12-13 20:21:48 -0500601 err = check_export(exp.ex_path.dentry->d_inode, &exp.ex_flags,
NeilBrownaf6a4e22007-02-14 00:33:12 -0800602 exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400603 if (err)
604 goto out4;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 }
606
NeilBrown4f7774c2006-03-27 01:15:03 -0800607 expp = svc_export_lookup(&exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 if (expp)
NeilBrown4f7774c2006-03-27 01:15:03 -0800609 expp = svc_export_update(&exp, expp);
610 else
611 err = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 cache_flush();
NeilBrown4f7774c2006-03-27 01:15:03 -0800613 if (expp == NULL)
614 err = -ENOMEM;
615 else
616 exp_put(expp);
Al Viroc1a2a472008-08-02 01:01:02 -0400617out4:
NeilBrownaf6a4e22007-02-14 00:33:12 -0800618 nfsd4_fslocs_free(&exp.ex_fslocs);
619 kfree(exp.ex_uuid);
Al Viroc1a2a472008-08-02 01:01:02 -0400620out3:
Jan Blunck54775492008-02-14 19:38:39 -0800621 kfree(exp.ex_pathname);
Al Viroc1a2a472008-08-02 01:01:02 -0400622out2:
623 path_put(&exp.ex_path);
624out1:
625 auth_domain_put(dom);
626out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800627 kfree(buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 return err;
629}
630
Manoj Naik933469192006-10-04 02:16:18 -0700631static void exp_flags(struct seq_file *m, int flag, int fsid,
632 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs);
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700633static void show_secinfo(struct seq_file *m, struct svc_export *exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634
635static int svc_export_show(struct seq_file *m,
636 struct cache_detail *cd,
637 struct cache_head *h)
638{
639 struct svc_export *exp ;
640
641 if (h ==NULL) {
642 seq_puts(m, "#path domain(flags)\n");
643 return 0;
644 }
645 exp = container_of(h, struct svc_export, h);
Jan Blunckc32c2f62008-02-14 19:38:43 -0800646 seq_path(m, &exp->ex_path, " \t\n\\");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700647 seq_putc(m, '\t');
648 seq_escape(m, exp->ex_client->name, " \t\n\\");
649 seq_putc(m, '(');
650 if (test_bit(CACHE_VALID, &h->flags) &&
NeilBrownaf6a4e22007-02-14 00:33:12 -0800651 !test_bit(CACHE_NEGATIVE, &h->flags)) {
Manoj Naik933469192006-10-04 02:16:18 -0700652 exp_flags(m, exp->ex_flags, exp->ex_fsid,
653 exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800654 if (exp->ex_uuid) {
655 int i;
656 seq_puts(m, ",uuid=");
657 for (i=0; i<16; i++) {
658 if ((i&3) == 0 && i)
659 seq_putc(m, ':');
660 seq_printf(m, "%02x", exp->ex_uuid[i]);
661 }
662 }
J. Bruce Fields91fe39d2007-07-17 04:04:49 -0700663 show_secinfo(m, exp);
NeilBrownaf6a4e22007-02-14 00:33:12 -0800664 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 seq_puts(m, ")\n");
666 return 0;
667}
NeilBrown4f7774c2006-03-27 01:15:03 -0800668static int svc_export_match(struct cache_head *a, struct cache_head *b)
669{
670 struct svc_export *orig = container_of(a, struct svc_export, h);
671 struct svc_export *new = container_of(b, struct svc_export, h);
672 return orig->ex_client == new->ex_client &&
Jan Blunck54775492008-02-14 19:38:39 -0800673 orig->ex_path.dentry == new->ex_path.dentry &&
674 orig->ex_path.mnt == new->ex_path.mnt;
NeilBrown4f7774c2006-03-27 01:15:03 -0800675}
676
677static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
678{
679 struct svc_export *new = container_of(cnew, struct svc_export, h);
680 struct svc_export *item = container_of(citem, struct svc_export, h);
681
682 kref_get(&item->ex_client->ref);
683 new->ex_client = item->ex_client;
Jan Blunck54775492008-02-14 19:38:39 -0800684 new->ex_path.dentry = dget(item->ex_path.dentry);
685 new->ex_path.mnt = mntget(item->ex_path.mnt);
686 new->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700687 new->ex_fslocs.locations = NULL;
688 new->ex_fslocs.locations_count = 0;
689 new->ex_fslocs.migrated = 0;
NeilBrown4f7774c2006-03-27 01:15:03 -0800690}
691
692static void export_update(struct cache_head *cnew, struct cache_head *citem)
693{
694 struct svc_export *new = container_of(cnew, struct svc_export, h);
695 struct svc_export *item = container_of(citem, struct svc_export, h);
Andy Adamsone677bfe2007-07-17 04:04:42 -0700696 int i;
NeilBrown4f7774c2006-03-27 01:15:03 -0800697
698 new->ex_flags = item->ex_flags;
699 new->ex_anon_uid = item->ex_anon_uid;
700 new->ex_anon_gid = item->ex_anon_gid;
701 new->ex_fsid = item->ex_fsid;
NeilBrownaf6a4e22007-02-14 00:33:12 -0800702 new->ex_uuid = item->ex_uuid;
703 item->ex_uuid = NULL;
Jan Blunck54775492008-02-14 19:38:39 -0800704 new->ex_pathname = item->ex_pathname;
705 item->ex_pathname = NULL;
Manoj Naik933469192006-10-04 02:16:18 -0700706 new->ex_fslocs.locations = item->ex_fslocs.locations;
707 item->ex_fslocs.locations = NULL;
708 new->ex_fslocs.locations_count = item->ex_fslocs.locations_count;
709 item->ex_fslocs.locations_count = 0;
710 new->ex_fslocs.migrated = item->ex_fslocs.migrated;
711 item->ex_fslocs.migrated = 0;
Andy Adamsone677bfe2007-07-17 04:04:42 -0700712 new->ex_nflavors = item->ex_nflavors;
713 for (i = 0; i < MAX_SECINFO_LIST; i++) {
714 new->ex_flavors[i] = item->ex_flavors[i];
715 }
NeilBrown4f7774c2006-03-27 01:15:03 -0800716}
717
718static struct cache_head *svc_export_alloc(void)
719{
720 struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
721 if (i)
722 return &i->h;
723 else
724 return NULL;
725}
726
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727struct cache_detail svc_export_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700728 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 .hash_size = EXPORT_HASHMAX,
730 .hash_table = export_table,
731 .name = "nfsd.export",
732 .cache_put = svc_export_put,
Trond Myklebustbc74b4f2009-08-09 15:14:29 -0400733 .cache_upcall = svc_export_upcall,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 .cache_parse = svc_export_parse,
735 .cache_show = svc_export_show,
NeilBrown4f7774c2006-03-27 01:15:03 -0800736 .match = svc_export_match,
737 .init = svc_export_init,
738 .update = export_update,
739 .alloc = svc_export_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740};
741
NeilBrown61f86032010-02-03 17:31:31 +1100742static int
743svc_export_hash(struct svc_export *exp)
744{
745 int hash;
746
747 hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
748 hash ^= hash_ptr(exp->ex_path.dentry, EXPORT_HASHBITS);
749 hash ^= hash_ptr(exp->ex_path.mnt, EXPORT_HASHBITS);
750 return hash;
751}
752
NeilBrown4f7774c2006-03-27 01:15:03 -0800753static struct svc_export *
754svc_export_lookup(struct svc_export *exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755{
NeilBrown4f7774c2006-03-27 01:15:03 -0800756 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100757 int hash = svc_export_hash(exp);
NeilBrown4f7774c2006-03-27 01:15:03 -0800758
759 ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
760 hash);
761 if (ch)
762 return container_of(ch, struct svc_export, h);
763 else
764 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765}
766
Adrian Bunk74cae612006-03-27 01:15:10 -0800767static struct svc_export *
NeilBrown4f7774c2006-03-27 01:15:03 -0800768svc_export_update(struct svc_export *new, struct svc_export *old)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769{
NeilBrown4f7774c2006-03-27 01:15:03 -0800770 struct cache_head *ch;
NeilBrown61f86032010-02-03 17:31:31 +1100771 int hash = svc_export_hash(old);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
NeilBrown4f7774c2006-03-27 01:15:03 -0800773 ch = sunrpc_cache_update(&svc_export_cache, &new->h,
774 &old->h,
775 hash);
776 if (ch)
777 return container_of(ch, struct svc_export, h);
778 else
779 return NULL;
780}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
782
Adrian Bunk74cae612006-03-27 01:15:10 -0800783static struct svc_expkey *
Linus Torvalds1da177e2005-04-16 15:20:36 -0700784exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
785{
786 struct svc_expkey key, *ek;
787 int err;
788
789 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700790 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791
792 key.ek_client = clp;
793 key.ek_fsidtype = fsid_type;
794 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
795
NeilBrown8d270f7f2006-03-27 01:15:04 -0800796 ek = svc_expkey_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700797 if (ek == NULL)
798 return ERR_PTR(-ENOMEM);
799 err = cache_check(&svc_expkey_cache, &ek->h, reqp);
800 if (err)
801 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 return ek;
803}
804
805static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
806 struct svc_export *exp)
807{
808 struct svc_expkey key, *ek;
809
810 key.ek_client = clp;
811 key.ek_fsidtype = fsid_type;
812 memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
Jan Bluncke83aece2008-02-14 19:38:41 -0800813 key.ek_path = exp->ex_path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 key.h.expiry_time = NEVER;
815 key.h.flags = 0;
816
NeilBrown8d270f7f2006-03-27 01:15:04 -0800817 ek = svc_expkey_lookup(&key);
818 if (ek)
819 ek = svc_expkey_update(&key,ek);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 if (ek) {
NeilBrownbaab9352006-03-27 01:15:09 -0800821 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700822 return 0;
823 }
824 return -ENOMEM;
825}
826
827/*
828 * Find the client's export entry matching xdev/xino.
829 */
830static inline struct svc_expkey *
831exp_get_key(svc_client *clp, dev_t dev, ino_t ino)
832{
833 u32 fsidv[3];
834
835 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800836 mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL);
837 return exp_find_key(clp, FSID_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700838 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800839 mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL);
840 return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841}
842
843/*
844 * Find the client's export entry matching fsid
845 */
846static inline struct svc_expkey *
847exp_get_fsid_key(svc_client *clp, int fsid)
848{
849 u32 fsidv[2];
850
NeilBrownaf6a4e22007-02-14 00:33:12 -0800851 mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
NeilBrownaf6a4e22007-02-14 00:33:12 -0800853 return exp_find_key(clp, FSID_NUM, fsidv, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700854}
855
Al Viro55430e22009-04-18 02:04:46 -0400856static svc_export *exp_get_by_name(svc_client *clp, const struct path *path,
857 struct cache_req *reqp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858{
859 struct svc_export *exp, key;
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700860 int err;
Jan Bluncke83aece2008-02-14 19:38:41 -0800861
Linus Torvalds1da177e2005-04-16 15:20:36 -0700862 if (!clp)
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700863 return ERR_PTR(-ENOENT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864
865 key.ex_client = clp;
Al Viro55430e22009-04-18 02:04:46 -0400866 key.ex_path = *path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867
NeilBrown4f7774c2006-03-27 01:15:03 -0800868 exp = svc_export_lookup(&key);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700869 if (exp == NULL)
870 return ERR_PTR(-ENOMEM);
871 err = cache_check(&svc_export_cache, &exp->h, reqp);
872 if (err)
873 return ERR_PTR(err);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874 return exp;
875}
876
877/*
878 * Find the export entry for a given dentry.
879 */
Al Viro5bf3bd22009-04-18 02:14:32 -0400880static struct svc_export *exp_parent(svc_client *clp, struct path *path)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881{
Al Viro5bf3bd22009-04-18 02:14:32 -0400882 struct dentry *saved = dget(path->dentry);
883 svc_export *exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700884
Al Viro5bf3bd22009-04-18 02:14:32 -0400885 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
886 struct dentry *parent = dget_parent(path->dentry);
887 dput(path->dentry);
888 path->dentry = parent;
889 exp = exp_get_by_name(clp, path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700890 }
Al Viro5bf3bd22009-04-18 02:14:32 -0400891 dput(path->dentry);
892 path->dentry = saved;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700893 return exp;
894}
895
896/*
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}
928
929static void exp_fsid_unhash(struct svc_export *exp)
930{
931 struct svc_expkey *ek;
932
933 if ((exp->ex_flags & NFSEXP_FSID) == 0)
934 return;
935
936 ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700937 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700938 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800939 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 }
941 svc_expkey_cache.nextcheck = get_seconds();
942}
943
944static int exp_fsid_hash(svc_client *clp, struct svc_export *exp)
945{
946 u32 fsid[2];
947
948 if ((exp->ex_flags & NFSEXP_FSID) == 0)
949 return 0;
950
NeilBrownaf6a4e22007-02-14 00:33:12 -0800951 mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL);
952 return exp_set_key(clp, FSID_NUM, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700953}
954
955static int exp_hash(struct auth_domain *clp, struct svc_export *exp)
956{
957 u32 fsid[2];
Jan Blunck54775492008-02-14 19:38:39 -0800958 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 dev_t dev = inode->i_sb->s_dev;
960
961 if (old_valid_dev(dev)) {
NeilBrownaf6a4e22007-02-14 00:33:12 -0800962 mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL);
963 return exp_set_key(clp, FSID_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964 }
NeilBrownaf6a4e22007-02-14 00:33:12 -0800965 mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL);
966 return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967}
968
969static void exp_unhash(struct svc_export *exp)
970{
971 struct svc_expkey *ek;
Jan Blunck54775492008-02-14 19:38:39 -0800972 struct inode *inode = exp->ex_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973
974 ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -0700975 if (!IS_ERR(ek)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 ek->h.expiry_time = get_seconds()-1;
NeilBrownbaab9352006-03-27 01:15:09 -0800977 cache_put(&ek->h, &svc_expkey_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978 }
979 svc_expkey_cache.nextcheck = get_seconds();
980}
981
982/*
983 * Export a file system.
984 */
985int
986exp_export(struct nfsctl_export *nxp)
987{
988 svc_client *clp;
989 struct svc_export *exp = NULL;
990 struct svc_export new;
991 struct svc_expkey *fsid_key = NULL;
Al Viroa63bb992008-08-02 01:03:36 -0400992 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993 int err;
994
995 /* Consistency check */
996 err = -EINVAL;
997 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
998 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
999 goto out;
1000
1001 dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n",
1002 nxp->ex_client, nxp->ex_path,
1003 (unsigned)nxp->ex_dev, (long)nxp->ex_ino,
1004 nxp->ex_flags);
1005
1006 /* Try to lock the export table for update */
1007 exp_writelock();
1008
1009 /* Look up client info */
1010 if (!(clp = auth_domain_find(nxp->ex_client)))
1011 goto out_unlock;
1012
1013
1014 /* Look up the dentry */
Al Viroa63bb992008-08-02 01:03:36 -04001015 err = kern_path(nxp->ex_path, 0, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 if (err)
Julia Lawall53e6d8d2008-07-25 22:08:09 +02001017 goto out_put_clp;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001018 err = -EINVAL;
1019
Al Viro55430e22009-04-18 02:04:46 -04001020 exp = exp_get_by_name(clp, &path, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001021
NeilBrownf9884432006-12-13 00:35:45 -08001022 memset(&new, 0, sizeof(new));
1023
Linus Torvalds1da177e2005-04-16 15:20:36 -07001024 /* must make sure there won't be an ex_fsid clash */
1025 if ((nxp->ex_flags & NFSEXP_FSID) &&
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001026 (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) &&
Jan Bluncke83aece2008-02-14 19:38:41 -08001027 fsid_key->ek_path.mnt &&
Al Viroa63bb992008-08-02 01:03:36 -04001028 (fsid_key->ek_path.mnt != path.mnt ||
1029 fsid_key->ek_path.dentry != path.dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 goto finish;
1031
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001032 if (!IS_ERR(exp)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001033 /* just a flags/id/fsid update */
1034
1035 exp_fsid_unhash(exp);
1036 exp->ex_flags = nxp->ex_flags;
1037 exp->ex_anon_uid = nxp->ex_anon_uid;
1038 exp->ex_anon_gid = nxp->ex_anon_gid;
1039 exp->ex_fsid = nxp->ex_dev;
1040
1041 err = exp_fsid_hash(clp, exp);
1042 goto finish;
1043 }
1044
J. Bruce Fields774b1472009-12-13 20:21:48 -05001045 err = check_export(path.dentry->d_inode, &nxp->ex_flags, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 if (err) goto finish;
1047
1048 err = -ENOMEM;
1049
1050 dprintk("nfsd: creating export entry %p for client %p\n", exp, clp);
1051
1052 new.h.expiry_time = NEVER;
1053 new.h.flags = 0;
Jan Blunck54775492008-02-14 19:38:39 -08001054 new.ex_pathname = kstrdup(nxp->ex_path, GFP_KERNEL);
1055 if (!new.ex_pathname)
NeilBrownf9884432006-12-13 00:35:45 -08001056 goto finish;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001057 new.ex_client = clp;
Al Viroa63bb992008-08-02 01:03:36 -04001058 new.ex_path = path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001059 new.ex_flags = nxp->ex_flags;
1060 new.ex_anon_uid = nxp->ex_anon_uid;
1061 new.ex_anon_gid = nxp->ex_anon_gid;
1062 new.ex_fsid = nxp->ex_dev;
1063
NeilBrown4f7774c2006-03-27 01:15:03 -08001064 exp = svc_export_lookup(&new);
1065 if (exp)
1066 exp = svc_export_update(&new, exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001067
NeilBrown4f7774c2006-03-27 01:15:03 -08001068 if (!exp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069 goto finish;
1070
Linus Torvalds1da177e2005-04-16 15:20:36 -07001071 if (exp_hash(clp, exp) ||
1072 exp_fsid_hash(clp, exp)) {
1073 /* failed to create at least one index */
1074 exp_do_unexport(exp);
1075 cache_flush();
NeilBrownf9884432006-12-13 00:35:45 -08001076 } else
1077 err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001078finish:
Jan Blunck54775492008-02-14 19:38:39 -08001079 kfree(new.ex_pathname);
Dan Carpenterd03859a2010-04-22 11:30:59 +02001080 if (!IS_ERR_OR_NULL(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001081 exp_put(exp);
Dan Carpenterd03859a2010-04-22 11:30:59 +02001082 if (!IS_ERR_OR_NULL(fsid_key))
NeilBrownbaab9352006-03-27 01:15:09 -08001083 cache_put(&fsid_key->h, &svc_expkey_cache);
Al Viroa63bb992008-08-02 01:03:36 -04001084 path_put(&path);
Julia Lawall53e6d8d2008-07-25 22:08:09 +02001085out_put_clp:
1086 auth_domain_put(clp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001087out_unlock:
1088 exp_writeunlock();
1089out:
1090 return err;
1091}
1092
1093/*
1094 * Unexport a file system. The export entry has already
1095 * been removed from the client's list of exported fs's.
1096 */
1097static void
1098exp_do_unexport(svc_export *unexp)
1099{
1100 unexp->h.expiry_time = get_seconds()-1;
1101 svc_export_cache.nextcheck = get_seconds();
1102 exp_unhash(unexp);
1103 exp_fsid_unhash(unexp);
1104}
1105
1106
1107/*
1108 * unexport syscall.
1109 */
1110int
1111exp_unexport(struct nfsctl_export *nxp)
1112{
1113 struct auth_domain *dom;
1114 svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -04001115 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116 int err;
1117
1118 /* Consistency check */
1119 if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) ||
1120 !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX))
1121 return -EINVAL;
1122
1123 exp_writelock();
1124
1125 err = -EINVAL;
1126 dom = auth_domain_find(nxp->ex_client);
1127 if (!dom) {
1128 dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client);
1129 goto out_unlock;
1130 }
1131
Al Viroa63bb992008-08-02 01:03:36 -04001132 err = kern_path(nxp->ex_path, 0, &path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 if (err)
1134 goto out_domain;
1135
1136 err = -EINVAL;
Al Viro55430e22009-04-18 02:04:46 -04001137 exp = exp_get_by_name(dom, &path, NULL);
Al Viroa63bb992008-08-02 01:03:36 -04001138 path_put(&path);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001139 if (IS_ERR(exp))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140 goto out_domain;
1141
1142 exp_do_unexport(exp);
1143 exp_put(exp);
1144 err = 0;
1145
1146out_domain:
1147 auth_domain_put(dom);
1148 cache_flush();
1149out_unlock:
1150 exp_writeunlock();
1151 return err;
1152}
1153
1154/*
1155 * Obtain the root fh on behalf of a client.
1156 * This could be done in user space, but I feel that it adds some safety
1157 * since its harder to fool a kernel module than a user space program.
1158 */
1159int
Al Viroa63bb992008-08-02 01:03:36 -04001160exp_rootfh(svc_client *clp, char *name, struct knfsd_fh *f, int maxsize)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161{
1162 struct svc_export *exp;
Al Viroa63bb992008-08-02 01:03:36 -04001163 struct path path;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001164 struct inode *inode;
1165 struct svc_fh fh;
1166 int err;
1167
1168 err = -EPERM;
1169 /* NB: we probably ought to check that it's NUL-terminated */
Al Viroa63bb992008-08-02 01:03:36 -04001170 if (kern_path(name, 0, &path)) {
1171 printk("nfsd: exp_rootfh path not found %s", name);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001172 return err;
1173 }
Al Viroa63bb992008-08-02 01:03:36 -04001174 inode = path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175
1176 dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n",
Al Viroa63bb992008-08-02 01:03:36 -04001177 name, path.dentry, clp->name,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 inode->i_sb->s_id, inode->i_ino);
Al Viro5bf3bd22009-04-18 02:14:32 -04001179 exp = exp_parent(clp, &path);
J.Bruce Fields4b41bd82006-12-13 00:35:21 -08001180 if (IS_ERR(exp)) {
1181 err = PTR_ERR(exp);
1182 goto out;
1183 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184
1185 /*
1186 * fh must be initialized before calling fh_compose
1187 */
1188 fh_init(&fh, maxsize);
Al Viroa63bb992008-08-02 01:03:36 -04001189 if (fh_compose(&fh, exp, path.dentry, NULL))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001190 err = -EINVAL;
1191 else
1192 err = 0;
1193 memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh));
1194 fh_put(&fh);
1195 exp_put(exp);
1196out:
Al Viroa63bb992008-08-02 01:03:36 -04001197 path_put(&path);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 return err;
1199}
1200
Adrian Bunkcce76f92007-10-16 01:27:52 -07001201static struct svc_export *exp_find(struct auth_domain *clp, int fsid_type,
1202 u32 *fsidv, struct cache_req *reqp)
NeilBrowneab7e2e2006-03-27 01:15:00 -08001203{
1204 struct svc_export *exp;
1205 struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001206 if (IS_ERR(ek))
David Howellse231c2e2008-02-07 00:15:26 -08001207 return ERR_CAST(ek);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001208
Al Viro55430e22009-04-18 02:04:46 -04001209 exp = exp_get_by_name(clp, &ek->ek_path, reqp);
NeilBrownbaab9352006-03-27 01:15:09 -08001210 cache_put(&ek->h, &svc_expkey_cache);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001211
J. Bruce Fields2d3bb252007-07-17 04:04:40 -07001212 if (IS_ERR(exp))
David Howellse231c2e2008-02-07 00:15:26 -08001213 return ERR_CAST(exp);
NeilBrowneab7e2e2006-03-27 01:15:00 -08001214 return exp;
1215}
1216
Andy Adamson32c1eb02007-07-17 04:04:48 -07001217__be32 check_nfsd_access(struct svc_export *exp, struct svc_rqst *rqstp)
1218{
1219 struct exp_flavor_info *f;
1220 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1221
1222 /* legacy gss-only clients are always OK: */
1223 if (exp->ex_client == rqstp->rq_gssclient)
1224 return 0;
1225 /* ip-address based client; check sec= export option: */
1226 for (f = exp->ex_flavors; f < end; f++) {
1227 if (f->pseudoflavor == rqstp->rq_flavor)
1228 return 0;
1229 }
1230 /* defaults in absence of sec= options: */
1231 if (exp->ex_nflavors == 0) {
1232 if (rqstp->rq_flavor == RPC_AUTH_NULL ||
1233 rqstp->rq_flavor == RPC_AUTH_UNIX)
1234 return 0;
1235 }
1236 return nfserr_wrongsec;
1237}
1238
J. Bruce Fields0989a782007-07-17 04:04:44 -07001239/*
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001240 * Uses rq_client and rq_gssclient to find an export; uses rq_client (an
1241 * auth_unix client) if it's available and has secinfo information;
1242 * otherwise, will try to use rq_gssclient.
1243 *
J. Bruce Fields0989a782007-07-17 04:04:44 -07001244 * Called from functions that handle requests; functions that do work on
1245 * behalf of mountd are passed a single client name to use, and should
1246 * use exp_get_by_name() or exp_find().
1247 */
1248struct svc_export *
Al Viro91c9fa82009-04-18 02:42:05 -04001249rqst_exp_get_by_name(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -07001250{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001251 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001252
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001253 if (rqstp->rq_client == NULL)
1254 goto gss;
1255
1256 /* First try the auth_unix client: */
Al Viro91c9fa82009-04-18 02:42:05 -04001257 exp = exp_get_by_name(rqstp->rq_client, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001258 if (PTR_ERR(exp) == -ENOENT)
1259 goto gss;
1260 if (IS_ERR(exp))
1261 return exp;
1262 /* If it has secinfo, assume there are no gss/... clients */
1263 if (exp->ex_nflavors > 0)
1264 return exp;
1265gss:
1266 /* Otherwise, try falling back on gss client */
1267 if (rqstp->rq_gssclient == NULL)
1268 return exp;
Al Viro91c9fa82009-04-18 02:42:05 -04001269 gssexp = exp_get_by_name(rqstp->rq_gssclient, path, &rqstp->rq_chandle);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001270 if (PTR_ERR(gssexp) == -ENOENT)
1271 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001272 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001273 exp_put(exp);
1274 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001275}
1276
1277struct svc_export *
1278rqst_exp_find(struct svc_rqst *rqstp, int fsid_type, u32 *fsidv)
1279{
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001280 struct svc_export *gssexp, *exp = ERR_PTR(-ENOENT);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001281
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001282 if (rqstp->rq_client == NULL)
1283 goto gss;
1284
1285 /* First try the auth_unix client: */
1286 exp = exp_find(rqstp->rq_client, fsid_type, fsidv, &rqstp->rq_chandle);
1287 if (PTR_ERR(exp) == -ENOENT)
1288 goto gss;
1289 if (IS_ERR(exp))
1290 return exp;
1291 /* If it has secinfo, assume there are no gss/... clients */
1292 if (exp->ex_nflavors > 0)
1293 return exp;
1294gss:
1295 /* Otherwise, try falling back on gss client */
1296 if (rqstp->rq_gssclient == NULL)
1297 return exp;
1298 gssexp = exp_find(rqstp->rq_gssclient, fsid_type, fsidv,
1299 &rqstp->rq_chandle);
1300 if (PTR_ERR(gssexp) == -ENOENT)
1301 return exp;
J. Bruce Fields9a25b962007-07-19 01:49:18 -07001302 if (!IS_ERR(exp))
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001303 exp_put(exp);
1304 return gssexp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001305}
1306
1307struct svc_export *
Al Viroe64c3902009-04-18 03:00:46 -04001308rqst_exp_parent(struct svc_rqst *rqstp, struct path *path)
J. Bruce Fields0989a782007-07-17 04:04:44 -07001309{
Al Viroe64c3902009-04-18 03:00:46 -04001310 struct dentry *saved = dget(path->dentry);
1311 struct svc_export *exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields3ab4d8b2007-07-17 04:04:46 -07001312
Al Viroe64c3902009-04-18 03:00:46 -04001313 while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(path->dentry)) {
1314 struct dentry *parent = dget_parent(path->dentry);
1315 dput(path->dentry);
1316 path->dentry = parent;
1317 exp = rqst_exp_get_by_name(rqstp, path);
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001318 }
Al Viroe64c3902009-04-18 03:00:46 -04001319 dput(path->dentry);
1320 path->dentry = saved;
J. Bruce Fields2ea22092007-07-17 04:04:46 -07001321 return exp;
J. Bruce Fields0989a782007-07-17 04:04:44 -07001322}
NeilBrowneab7e2e2006-03-27 01:15:00 -08001323
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001324static struct svc_export *find_fsidzero_export(struct svc_rqst *rqstp)
1325{
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001326 u32 fsidv[2];
1327
1328 mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL);
1329
J. Bruce Fields260c64d2010-02-08 13:42:26 -05001330 return rqst_exp_find(rqstp, FSID_NUM, fsidv);
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001331}
1332
Linus Torvalds1da177e2005-04-16 15:20:36 -07001333/*
1334 * Called when we need the filehandle for the root of the pseudofs,
1335 * for a given NFSv4 client. The root is defined to be the
1336 * export point with fsid==0
1337 */
Al Viroc7afef12006-10-19 23:29:02 -07001338__be32
J. Bruce Fieldsdf547ef2007-07-17 04:04:43 -07001339exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001340{
NeilBrowneab7e2e2006-03-27 01:15:00 -08001341 struct svc_export *exp;
Al Viroc7afef12006-10-19 23:29:02 -07001342 __be32 rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001343
J. Bruce Fieldsf39bde22009-09-27 14:41:43 -04001344 exp = find_fsidzero_export(rqstp);
J.Bruce Fields68993202006-12-13 00:35:23 -08001345 if (IS_ERR(exp))
1346 return nfserrno(PTR_ERR(exp));
Jan Blunck54775492008-02-14 19:38:39 -08001347 rv = fh_compose(fhp, exp, exp->ex_path.dentry, NULL);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001348 if (rv)
1349 goto out;
1350 rv = check_nfsd_access(exp, rqstp);
Trond Myklebust2671a4b2009-09-02 16:48:32 -04001351 if (rv)
1352 fh_put(fhp);
Andy Adamson32c1eb02007-07-17 04:04:48 -07001353out:
J.Bruce Fieldsd0ebd9c2006-10-04 02:16:10 -07001354 exp_put(exp);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355 return rv;
1356}
1357
1358/* Iterator */
1359
1360static void *e_start(struct seq_file *m, loff_t *pos)
Josh Triplett896440d2006-10-02 02:17:50 -07001361 __acquires(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001362{
1363 loff_t n = *pos;
1364 unsigned hash, export;
1365 struct cache_head *ch;
1366
1367 exp_readlock();
1368 read_lock(&svc_export_cache.hash_lock);
1369 if (!n--)
Greg Banksbc6f02e2006-10-02 02:17:49 -07001370 return SEQ_START_TOKEN;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001371 hash = n >> 32;
1372 export = n & ((1LL<<32) - 1);
1373
1374
1375 for (ch=export_table[hash]; ch; ch=ch->next)
1376 if (!export--)
1377 return ch;
1378 n &= ~((1LL<<32) - 1);
1379 do {
1380 hash++;
1381 n += 1LL<<32;
1382 } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL);
1383 if (hash >= EXPORT_HASHMAX)
1384 return NULL;
1385 *pos = n+1;
1386 return export_table[hash];
1387}
1388
1389static void *e_next(struct seq_file *m, void *p, loff_t *pos)
1390{
1391 struct cache_head *ch = p;
1392 int hash = (*pos >> 32);
1393
Greg Banksbc6f02e2006-10-02 02:17:49 -07001394 if (p == SEQ_START_TOKEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395 hash = 0;
1396 else if (ch->next == NULL) {
1397 hash++;
1398 *pos += 1LL<<32;
1399 } else {
1400 ++*pos;
1401 return ch->next;
1402 }
1403 *pos &= ~((1LL<<32) - 1);
1404 while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) {
1405 hash++;
1406 *pos += 1LL<<32;
1407 }
1408 if (hash >= EXPORT_HASHMAX)
1409 return NULL;
1410 ++*pos;
1411 return export_table[hash];
1412}
1413
1414static void e_stop(struct seq_file *m, void *p)
Josh Triplett896440d2006-10-02 02:17:50 -07001415 __releases(svc_export_cache.hash_lock)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416{
1417 read_unlock(&svc_export_cache.hash_lock);
1418 exp_readunlock();
1419}
1420
1421static struct flags {
1422 int flag;
1423 char *name[2];
1424} expflags[] = {
1425 { NFSEXP_READONLY, {"ro", "rw"}},
1426 { NFSEXP_INSECURE_PORT, {"insecure", ""}},
1427 { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}},
1428 { NFSEXP_ALLSQUASH, {"all_squash", ""}},
1429 { NFSEXP_ASYNC, {"async", "sync"}},
1430 { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}},
1431 { NFSEXP_NOHIDE, {"nohide", ""}},
1432 { NFSEXP_CROSSMOUNT, {"crossmnt", ""}},
1433 { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}},
1434 { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}},
Steve Dicksoneb4c86c2009-09-09 14:58:22 -04001435 { NFSEXP_V4ROOT, {"v4root", ""}},
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436#ifdef MSNFS
1437 { NFSEXP_MSNFS, {"msnfs", ""}},
1438#endif
1439 { 0, {"", ""}}
1440};
1441
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001442static void show_expflags(struct seq_file *m, int flags, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443{
Linus Torvalds1da177e2005-04-16 15:20:36 -07001444 struct flags *flg;
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001445 int state, first = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001446
1447 for (flg = expflags; flg->flag; flg++) {
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001448 if (flg->flag & ~mask)
1449 continue;
1450 state = (flg->flag & flags) ? 0 : 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 if (*flg->name[state])
1452 seq_printf(m, "%s%s", first++?",":"", flg->name[state]);
1453 }
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001454}
1455
J. Bruce Fields91fe39d2007-07-17 04:04:49 -07001456static void show_secinfo_flags(struct seq_file *m, int flags)
1457{
1458 seq_printf(m, ",");
1459 show_expflags(m, flags, NFSEXP_SECINFO_FLAGS);
1460}
1461
1462static void show_secinfo(struct seq_file *m, struct svc_export *exp)
1463{
1464 struct exp_flavor_info *f;
1465 struct exp_flavor_info *end = exp->ex_flavors + exp->ex_nflavors;
1466 int lastflags = 0, first = 0;
1467
1468 if (exp->ex_nflavors == 0)
1469 return;
1470 for (f = exp->ex_flavors; f < end; f++) {
1471 if (first || f->flags != lastflags) {
1472 if (!first)
1473 show_secinfo_flags(m, lastflags);
1474 seq_printf(m, ",sec=%d", f->pseudoflavor);
1475 lastflags = f->flags;
1476 } else {
1477 seq_printf(m, ":%d", f->pseudoflavor);
1478 }
1479 }
1480 show_secinfo_flags(m, lastflags);
1481}
1482
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001483static void exp_flags(struct seq_file *m, int flag, int fsid,
1484 uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc)
1485{
1486 show_expflags(m, flag, NFSEXP_ALLFLAGS);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487 if (flag & NFSEXP_FSID)
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001488 seq_printf(m, ",fsid=%d", fsid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001489 if (anonu != (uid_t)-2 && anonu != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001490 seq_printf(m, ",anonuid=%u", anonu);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491 if (anong != (gid_t)-2 && anong != (0x10000-2))
J. Bruce Fields3e635162007-07-21 04:37:30 -07001492 seq_printf(m, ",anongid=%u", anong);
Manoj Naik933469192006-10-04 02:16:18 -07001493 if (fsloc && fsloc->locations_count > 0) {
1494 char *loctype = (fsloc->migrated) ? "refer" : "replicas";
1495 int i;
1496
J. Bruce Fieldsac34cdb2007-07-17 04:04:49 -07001497 seq_printf(m, ",%s=", loctype);
Manoj Naik933469192006-10-04 02:16:18 -07001498 seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\");
1499 seq_putc(m, '@');
1500 seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\");
1501 for (i = 1; i < fsloc->locations_count; i++) {
1502 seq_putc(m, ';');
1503 seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\");
1504 seq_putc(m, '@');
1505 seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\");
1506 }
1507 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001508}
1509
1510static int e_show(struct seq_file *m, void *p)
1511{
1512 struct cache_head *cp = p;
1513 struct svc_export *exp = container_of(cp, struct svc_export, h);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001514
Greg Banksbc6f02e2006-10-02 02:17:49 -07001515 if (p == SEQ_START_TOKEN) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001516 seq_puts(m, "# Version 1.1\n");
1517 seq_puts(m, "# Path Client(Flags) # IPs\n");
1518 return 0;
1519 }
1520
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521 cache_get(&exp->h);
1522 if (cache_check(&svc_export_cache, &exp->h, NULL))
1523 return 0;
NeilBrownbaab9352006-03-27 01:15:09 -08001524 cache_put(&exp->h, &svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001525 return svc_export_show(m, &svc_export_cache, cp);
1526}
1527
James Morris88e9d342009-09-22 16:43:43 -07001528const struct seq_operations nfs_exports_op = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529 .start = e_start,
1530 .next = e_next,
1531 .stop = e_stop,
1532 .show = e_show,
1533};
1534
1535/*
1536 * Add or modify a client.
1537 * Change requests may involve the list of host addresses. The list of
1538 * exports and possibly existing uid maps are left untouched.
1539 */
1540int
1541exp_addclient(struct nfsctl_client *ncp)
1542{
1543 struct auth_domain *dom;
1544 int i, err;
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001545 struct in6_addr addr6;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001546
1547 /* First, consistency check. */
1548 err = -EINVAL;
1549 if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1550 goto out;
1551 if (ncp->cl_naddr > NFSCLNT_ADDRMAX)
1552 goto out;
1553
1554 /* Lock the hashtable */
1555 exp_writelock();
1556
1557 dom = unix_domain_find(ncp->cl_ident);
1558
1559 err = -ENOMEM;
1560 if (!dom)
1561 goto out_unlock;
1562
1563 /* Insert client into hashtable. */
Aurélien Charbonf15364b2008-01-18 15:50:56 +01001564 for (i = 0; i < ncp->cl_naddr; i++) {
1565 ipv6_addr_set_v4mapped(ncp->cl_addrlist[i].s_addr, &addr6);
1566 auth_unix_add_addr(&addr6, dom);
1567 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001568 auth_unix_forget_old(dom);
1569 auth_domain_put(dom);
1570
1571 err = 0;
1572
1573out_unlock:
1574 exp_writeunlock();
1575out:
1576 return err;
1577}
1578
1579/*
1580 * Delete a client given an identifier.
1581 */
1582int
1583exp_delclient(struct nfsctl_client *ncp)
1584{
1585 int err;
1586 struct auth_domain *dom;
1587
1588 err = -EINVAL;
1589 if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX))
1590 goto out;
1591
1592 /* Lock the hashtable */
1593 exp_writelock();
1594
1595 dom = auth_domain_find(ncp->cl_ident);
1596 /* just make sure that no addresses work
1597 * and that it will expire soon
1598 */
1599 if (dom) {
1600 err = auth_unix_forget_old(dom);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001601 auth_domain_put(dom);
1602 }
1603
1604 exp_writeunlock();
1605out:
1606 return err;
1607}
1608
1609/*
1610 * Verify that string is non-empty and does not exceed max length.
1611 */
1612static int
1613exp_verify_string(char *cp, int max)
1614{
1615 int i;
1616
1617 for (i = 0; i < max; i++)
1618 if (!cp[i])
1619 return i;
1620 cp[i] = 0;
1621 printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp);
1622 return 0;
1623}
1624
1625/*
1626 * Initialize the exports module.
1627 */
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001628int
Linus Torvalds1da177e2005-04-16 15:20:36 -07001629nfsd_export_init(void)
1630{
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001631 int rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001632 dprintk("nfsd: initializing export module.\n");
1633
J. Bruce Fieldsdbf847e2007-11-08 17:20:34 -05001634 rv = cache_register(&svc_export_cache);
1635 if (rv)
1636 return rv;
1637 rv = cache_register(&svc_expkey_cache);
1638 if (rv)
1639 cache_unregister(&svc_export_cache);
1640 return rv;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001641
1642}
1643
1644/*
1645 * Flush exports table - called when last nfsd thread is killed
1646 */
1647void
1648nfsd_export_flush(void)
1649{
1650 exp_writelock();
1651 cache_purge(&svc_expkey_cache);
1652 cache_purge(&svc_export_cache);
1653 exp_writeunlock();
1654}
1655
1656/*
1657 * Shutdown the exports module.
1658 */
1659void
1660nfsd_export_shutdown(void)
1661{
1662
1663 dprintk("nfsd: shutting down export module.\n");
1664
1665 exp_writelock();
1666
J. Bruce Fieldsdf95a9d2007-11-08 16:09:59 -05001667 cache_unregister(&svc_expkey_cache);
1668 cache_unregister(&svc_export_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001669 svcauth_unix_purge();
1670
1671 exp_writeunlock();
1672 dprintk("nfsd: export shutdown complete.\n");
1673}