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Commit | Line | Data |
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1da177e4 LT |
1 | #define MSNFS /* HACK HACK */ |
2 | /* | |
3 | * linux/fs/nfsd/export.c | |
4 | * | |
5 | * NFS exporting and validation. | |
6 | * | |
7 | * We maintain a list of clients, each of which has a list of | |
8 | * exports. To export an fs to a given client, you first have | |
9 | * to create the client entry with NFSCTL_ADDCLIENT, which | |
10 | * creates a client control block and adds it to the hash | |
11 | * table. Then, you call NFSCTL_EXPORT for each fs. | |
12 | * | |
13 | * | |
14 | * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> | |
15 | */ | |
16 | ||
17 | #include <linux/unistd.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/stat.h> |
20 | #include <linux/in.h> | |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/syscalls.h> | |
23 | #include <linux/rwsem.h> | |
24 | #include <linux/dcache.h> | |
25 | #include <linux/namei.h> | |
26 | #include <linux/mount.h> | |
27 | #include <linux/hash.h> | |
f35279d3 | 28 | #include <linux/module.h> |
a5694255 | 29 | #include <linux/exportfs.h> |
1da177e4 LT |
30 | |
31 | #include <linux/sunrpc/svc.h> | |
32 | #include <linux/nfsd/nfsd.h> | |
33 | #include <linux/nfsd/nfsfh.h> | |
34 | #include <linux/nfsd/syscall.h> | |
35 | #include <linux/lockd/bind.h> | |
e677bfe4 AA |
36 | #include <linux/sunrpc/msg_prot.h> |
37 | #include <linux/sunrpc/gss_api.h> | |
1da177e4 LT |
38 | |
39 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT | |
1da177e4 LT |
40 | |
41 | typedef struct auth_domain svc_client; | |
42 | typedef struct svc_export svc_export; | |
43 | ||
44 | static void exp_do_unexport(svc_export *unexp); | |
45 | static int exp_verify_string(char *cp, int max); | |
46 | ||
47 | /* | |
48 | * We have two caches. | |
49 | * One maps client+vfsmnt+dentry to export options - the export map | |
50 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
51 | * | |
52 | * The export options are actually stored in the first map, and the | |
53 | * second map contains a reference to the entry in the first map. | |
54 | */ | |
55 | ||
56 | #define EXPKEY_HASHBITS 8 | |
57 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
58 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
59 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
60 | ||
74cae61a | 61 | static void expkey_put(struct kref *ref) |
1da177e4 | 62 | { |
baab935f N |
63 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
64 | ||
65 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
66 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) { | |
67 | dput(key->ek_dentry); | |
68 | mntput(key->ek_mnt); | |
1da177e4 | 69 | } |
baab935f N |
70 | auth_domain_put(key->ek_client); |
71 | kfree(key); | |
1da177e4 LT |
72 | } |
73 | ||
74 | static void expkey_request(struct cache_detail *cd, | |
75 | struct cache_head *h, | |
76 | char **bpp, int *blen) | |
77 | { | |
78 | /* client fsidtype \xfsid */ | |
79 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
80 | char type[5]; | |
81 | ||
82 | qword_add(bpp, blen, ek->ek_client->name); | |
83 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
84 | qword_add(bpp, blen, type); | |
85 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
86 | (*bpp)[-1] = '\n'; | |
87 | } | |
88 | ||
8d270f7f N |
89 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
90 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); | |
74cae61a AB |
91 | static struct cache_detail svc_expkey_cache; |
92 | ||
1da177e4 LT |
93 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
94 | { | |
95 | /* client fsidtype fsid [path] */ | |
96 | char *buf; | |
97 | int len; | |
98 | struct auth_domain *dom = NULL; | |
99 | int err; | |
100 | int fsidtype; | |
101 | char *ep; | |
102 | struct svc_expkey key; | |
8d270f7f | 103 | struct svc_expkey *ek; |
1da177e4 LT |
104 | |
105 | if (mesg[mlen-1] != '\n') | |
106 | return -EINVAL; | |
107 | mesg[mlen-1] = 0; | |
108 | ||
109 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
110 | err = -ENOMEM; | |
111 | if (!buf) goto out; | |
112 | ||
113 | err = -EINVAL; | |
114 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
115 | goto out; | |
116 | ||
117 | err = -ENOENT; | |
118 | dom = auth_domain_find(buf); | |
119 | if (!dom) | |
120 | goto out; | |
121 | dprintk("found domain %s\n", buf); | |
122 | ||
123 | err = -EINVAL; | |
124 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
125 | goto out; | |
126 | fsidtype = simple_strtoul(buf, &ep, 10); | |
127 | if (*ep) | |
128 | goto out; | |
129 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 130 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
131 | goto out; |
132 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
133 | goto out; | |
134 | dprintk("found fsid length %d\n", len); | |
135 | if (len != key_len(fsidtype)) | |
136 | goto out; | |
137 | ||
138 | /* OK, we seem to have a valid key */ | |
139 | key.h.flags = 0; | |
140 | key.h.expiry_time = get_expiry(&mesg); | |
141 | if (key.h.expiry_time == 0) | |
142 | goto out; | |
143 | ||
144 | key.ek_client = dom; | |
145 | key.ek_fsidtype = fsidtype; | |
146 | memcpy(key.ek_fsid, buf, len); | |
147 | ||
8d270f7f N |
148 | ek = svc_expkey_lookup(&key); |
149 | err = -ENOMEM; | |
150 | if (!ek) | |
151 | goto out; | |
152 | ||
1da177e4 | 153 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 154 | err = -EINVAL; |
1da177e4 LT |
155 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
156 | goto out; | |
157 | dprintk("Path seems to be <%s>\n", buf); | |
158 | err = 0; | |
159 | if (len == 0) { | |
1da177e4 | 160 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
8d270f7f | 161 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 162 | if (ek) |
baab935f | 163 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f | 164 | else err = -ENOMEM; |
1da177e4 LT |
165 | } else { |
166 | struct nameidata nd; | |
1da177e4 LT |
167 | err = path_lookup(buf, 0, &nd); |
168 | if (err) | |
169 | goto out; | |
170 | ||
171 | dprintk("Found the path %s\n", buf); | |
eab7e2e6 N |
172 | key.ek_mnt = nd.mnt; |
173 | key.ek_dentry = nd.dentry; | |
1da177e4 | 174 | |
8d270f7f | 175 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 176 | if (ek) |
baab935f | 177 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f N |
178 | else |
179 | err = -ENOMEM; | |
1da177e4 LT |
180 | path_release(&nd); |
181 | } | |
182 | cache_flush(); | |
183 | out: | |
184 | if (dom) | |
185 | auth_domain_put(dom); | |
f99d49ad | 186 | kfree(buf); |
1da177e4 LT |
187 | return err; |
188 | } | |
189 | ||
190 | static int expkey_show(struct seq_file *m, | |
191 | struct cache_detail *cd, | |
192 | struct cache_head *h) | |
193 | { | |
194 | struct svc_expkey *ek ; | |
af6a4e28 | 195 | int i; |
1da177e4 LT |
196 | |
197 | if (h ==NULL) { | |
198 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
199 | return 0; | |
200 | } | |
201 | ek = container_of(h, struct svc_expkey, h); | |
af6a4e28 N |
202 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
203 | ek->ek_fsidtype); | |
204 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
205 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
206 | if (test_bit(CACHE_VALID, &h->flags) && |
207 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
208 | seq_printf(m, " "); | |
eab7e2e6 | 209 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
1da177e4 LT |
210 | } |
211 | seq_printf(m, "\n"); | |
212 | return 0; | |
213 | } | |
1da177e4 | 214 | |
8d270f7f | 215 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 216 | { |
8d270f7f N |
217 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
218 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
219 | ||
220 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
221 | orig->ek_client != new->ek_client || | |
222 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
223 | return 0; |
224 | return 1; | |
225 | } | |
226 | ||
8d270f7f N |
227 | static inline void expkey_init(struct cache_head *cnew, |
228 | struct cache_head *citem) | |
1da177e4 | 229 | { |
8d270f7f N |
230 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
231 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
232 | ||
efc36aa5 | 233 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
234 | new->ek_client = item->ek_client; |
235 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
236 | |
237 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
238 | } |
239 | ||
8d270f7f N |
240 | static inline void expkey_update(struct cache_head *cnew, |
241 | struct cache_head *citem) | |
1da177e4 | 242 | { |
8d270f7f N |
243 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
244 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
245 | ||
eab7e2e6 N |
246 | new->ek_mnt = mntget(item->ek_mnt); |
247 | new->ek_dentry = dget(item->ek_dentry); | |
1da177e4 LT |
248 | } |
249 | ||
8d270f7f N |
250 | static struct cache_head *expkey_alloc(void) |
251 | { | |
252 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
253 | if (i) | |
254 | return &i->h; | |
255 | else | |
256 | return NULL; | |
257 | } | |
258 | ||
74cae61a | 259 | static struct cache_detail svc_expkey_cache = { |
8d270f7f N |
260 | .owner = THIS_MODULE, |
261 | .hash_size = EXPKEY_HASHMAX, | |
262 | .hash_table = expkey_table, | |
263 | .name = "nfsd.fh", | |
264 | .cache_put = expkey_put, | |
265 | .cache_request = expkey_request, | |
266 | .cache_parse = expkey_parse, | |
267 | .cache_show = expkey_show, | |
268 | .match = expkey_match, | |
269 | .init = expkey_init, | |
270 | .update = expkey_update, | |
271 | .alloc = expkey_alloc, | |
272 | }; | |
273 | ||
274 | static struct svc_expkey * | |
275 | svc_expkey_lookup(struct svc_expkey *item) | |
276 | { | |
277 | struct cache_head *ch; | |
278 | int hash = item->ek_fsidtype; | |
279 | char * cp = (char*)item->ek_fsid; | |
280 | int len = key_len(item->ek_fsidtype); | |
281 | ||
282 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
283 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
284 | hash &= EXPKEY_HASHMASK; | |
285 | ||
286 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
287 | hash); | |
288 | if (ch) | |
289 | return container_of(ch, struct svc_expkey, h); | |
290 | else | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | static struct svc_expkey * | |
295 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
296 | { | |
297 | struct cache_head *ch; | |
298 | int hash = new->ek_fsidtype; | |
299 | char * cp = (char*)new->ek_fsid; | |
300 | int len = key_len(new->ek_fsidtype); | |
301 | ||
302 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
303 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); | |
304 | hash &= EXPKEY_HASHMASK; | |
305 | ||
306 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
307 | &old->h, hash); | |
308 | if (ch) | |
309 | return container_of(ch, struct svc_expkey, h); | |
310 | else | |
311 | return NULL; | |
312 | } | |
313 | ||
1da177e4 LT |
314 | |
315 | #define EXPORT_HASHBITS 8 | |
316 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
317 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
318 | ||
319 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
320 | ||
93346919 MN |
321 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
322 | { | |
323 | int i; | |
324 | ||
325 | for (i = 0; i < fsloc->locations_count; i++) { | |
326 | kfree(fsloc->locations[i].path); | |
327 | kfree(fsloc->locations[i].hosts); | |
328 | } | |
329 | kfree(fsloc->locations); | |
330 | } | |
331 | ||
baab935f | 332 | static void svc_export_put(struct kref *ref) |
1da177e4 | 333 | { |
baab935f N |
334 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
335 | dput(exp->ex_dentry); | |
336 | mntput(exp->ex_mnt); | |
337 | auth_domain_put(exp->ex_client); | |
b009a873 | 338 | kfree(exp->ex_path); |
93346919 | 339 | nfsd4_fslocs_free(&exp->ex_fslocs); |
baab935f | 340 | kfree(exp); |
1da177e4 LT |
341 | } |
342 | ||
343 | static void svc_export_request(struct cache_detail *cd, | |
344 | struct cache_head *h, | |
345 | char **bpp, int *blen) | |
346 | { | |
347 | /* client path */ | |
348 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
349 | char *pth; | |
350 | ||
351 | qword_add(bpp, blen, exp->ex_client->name); | |
352 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
353 | if (IS_ERR(pth)) { | |
354 | /* is this correct? */ | |
355 | (*bpp)[0] = '\n'; | |
356 | return; | |
357 | } | |
358 | qword_add(bpp, blen, pth); | |
359 | (*bpp)[-1] = '\n'; | |
360 | } | |
361 | ||
74cae61a AB |
362 | static struct svc_export *svc_export_update(struct svc_export *new, |
363 | struct svc_export *old); | |
4f7774c3 | 364 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 365 | |
af6a4e28 | 366 | static int check_export(struct inode *inode, int flags, unsigned char *uuid) |
1da177e4 LT |
367 | { |
368 | ||
369 | /* We currently export only dirs and regular files. | |
370 | * This is what umountd does. | |
371 | */ | |
372 | if (!S_ISDIR(inode->i_mode) && | |
373 | !S_ISREG(inode->i_mode)) | |
374 | return -ENOTDIR; | |
375 | ||
376 | /* There are two requirements on a filesystem to be exportable. | |
377 | * 1: We must be able to identify the filesystem from a number. | |
378 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 379 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
380 | * 2: We must be able to find an inode from a filehandle. |
381 | * This means that s_export_op must be set. | |
382 | */ | |
383 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
af6a4e28 N |
384 | !(flags & NFSEXP_FSID) && |
385 | uuid == NULL) { | |
3e3b4800 | 386 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
387 | return -EINVAL; |
388 | } | |
389 | if (!inode->i_sb->s_export_op) { | |
390 | dprintk("exp_export: export of invalid fs type.\n"); | |
391 | return -EINVAL; | |
392 | } | |
393 | ||
394 | /* Ok, we can export it */; | |
395 | if (!inode->i_sb->s_export_op->find_exported_dentry) | |
396 | inode->i_sb->s_export_op->find_exported_dentry = | |
397 | find_exported_dentry; | |
398 | return 0; | |
399 | ||
400 | } | |
401 | ||
93346919 MN |
402 | #ifdef CONFIG_NFSD_V4 |
403 | ||
404 | static int | |
405 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
406 | { | |
407 | int len; | |
408 | int migrated, i, err; | |
409 | ||
93346919 MN |
410 | /* 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; | |
452 | out_free_all: | |
453 | nfsd4_fslocs_free(fsloc); | |
454 | return err; | |
455 | } | |
456 | ||
e677bfe4 AA |
457 | static 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 | /* | |
473 | * Just a quick sanity check; we could also try to check | |
474 | * whether this pseudoflavor is supported, but at worst | |
475 | * an unsupported pseudoflavor on the export would just | |
476 | * be a pseudoflavor that won't match the flavor of any | |
477 | * authenticated request. The administrator will | |
478 | * probably discover the problem when someone fails to | |
479 | * authenticate. | |
480 | */ | |
481 | if (f->pseudoflavor < 0) | |
482 | return -EINVAL; | |
483 | err = get_int(mesg, &f->flags); | |
484 | if (err) | |
485 | return err; | |
486 | /* Only some flags are allowed to differ between flavors: */ | |
487 | if (~NFSEXP_SECINFO_FLAGS & (f->flags ^ exp->ex_flags)) | |
488 | return -EINVAL; | |
489 | } | |
490 | exp->ex_nflavors = listsize; | |
491 | return 0; | |
492 | } | |
493 | ||
93346919 | 494 | #else /* CONFIG_NFSD_V4 */ |
e677bfe4 AA |
495 | static inline int |
496 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc){return 0;} | |
497 | static inline int | |
498 | secinfo_parse(char **mesg, char *buf, struct svc_export *exp) { return 0; } | |
93346919 MN |
499 | #endif |
500 | ||
1da177e4 LT |
501 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
502 | { | |
503 | /* client path expiry [flags anonuid anongid fsid] */ | |
504 | char *buf; | |
505 | int len; | |
506 | int err; | |
507 | struct auth_domain *dom = NULL; | |
508 | struct nameidata nd; | |
509 | struct svc_export exp, *expp; | |
510 | int an_int; | |
511 | ||
512 | nd.dentry = NULL; | |
b009a873 | 513 | exp.ex_path = NULL; |
1da177e4 | 514 | |
402acd29 N |
515 | /* fs locations */ |
516 | exp.ex_fslocs.locations = NULL; | |
517 | exp.ex_fslocs.locations_count = 0; | |
518 | exp.ex_fslocs.migrated = 0; | |
519 | ||
520 | exp.ex_uuid = NULL; | |
521 | ||
e677bfe4 AA |
522 | /* secinfo */ |
523 | exp.ex_nflavors = 0; | |
524 | ||
1da177e4 LT |
525 | if (mesg[mlen-1] != '\n') |
526 | return -EINVAL; | |
527 | mesg[mlen-1] = 0; | |
528 | ||
529 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
530 | err = -ENOMEM; | |
531 | if (!buf) goto out; | |
532 | ||
533 | /* client */ | |
534 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
535 | err = -EINVAL; | |
536 | if (len <= 0) goto out; | |
537 | ||
538 | err = -ENOENT; | |
539 | dom = auth_domain_find(buf); | |
540 | if (!dom) | |
541 | goto out; | |
542 | ||
543 | /* path */ | |
544 | err = -EINVAL; | |
545 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
546 | goto out; | |
547 | err = path_lookup(buf, 0, &nd); | |
cd156549 | 548 | if (err) goto out_no_path; |
1da177e4 LT |
549 | |
550 | exp.h.flags = 0; | |
551 | exp.ex_client = dom; | |
552 | exp.ex_mnt = nd.mnt; | |
553 | exp.ex_dentry = nd.dentry; | |
b009a873 BF |
554 | exp.ex_path = kstrdup(buf, GFP_KERNEL); |
555 | err = -ENOMEM; | |
556 | if (!exp.ex_path) | |
557 | goto out; | |
1da177e4 LT |
558 | |
559 | /* expiry */ | |
560 | err = -EINVAL; | |
561 | exp.h.expiry_time = get_expiry(&mesg); | |
562 | if (exp.h.expiry_time == 0) | |
563 | goto out; | |
564 | ||
565 | /* flags */ | |
566 | err = get_int(&mesg, &an_int); | |
567 | if (err == -ENOENT) | |
568 | set_bit(CACHE_NEGATIVE, &exp.h.flags); | |
569 | else { | |
570 | if (err || an_int < 0) goto out; | |
571 | exp.ex_flags= an_int; | |
572 | ||
573 | /* anon uid */ | |
574 | err = get_int(&mesg, &an_int); | |
575 | if (err) goto out; | |
576 | exp.ex_anon_uid= an_int; | |
577 | ||
578 | /* anon gid */ | |
579 | err = get_int(&mesg, &an_int); | |
580 | if (err) goto out; | |
581 | exp.ex_anon_gid= an_int; | |
582 | ||
583 | /* fsid */ | |
584 | err = get_int(&mesg, &an_int); | |
585 | if (err) goto out; | |
586 | exp.ex_fsid = an_int; | |
587 | ||
af6a4e28 N |
588 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
589 | if (strcmp(buf, "fsloc") == 0) | |
590 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
591 | else if (strcmp(buf, "uuid") == 0) { | |
592 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
593 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
594 | if (len != 16) | |
595 | err = -EINVAL; | |
596 | else { | |
597 | exp.ex_uuid = | |
598 | kmemdup(buf, 16, GFP_KERNEL); | |
599 | if (exp.ex_uuid == NULL) | |
600 | err = -ENOMEM; | |
601 | } | |
e677bfe4 AA |
602 | } else if (strcmp(buf, "secinfo") == 0) |
603 | err = secinfo_parse(&mesg, buf, &exp); | |
604 | else | |
af6a4e28 N |
605 | /* quietly ignore unknown words and anything |
606 | * following. Newer user-space can try to set | |
607 | * new values, then see what the result was. | |
608 | */ | |
609 | break; | |
610 | if (err) | |
611 | goto out; | |
612 | } | |
93346919 | 613 | |
af6a4e28 N |
614 | err = check_export(nd.dentry->d_inode, exp.ex_flags, |
615 | exp.ex_uuid); | |
616 | if (err) goto out; | |
1da177e4 LT |
617 | } |
618 | ||
4f7774c3 | 619 | expp = svc_export_lookup(&exp); |
1da177e4 | 620 | if (expp) |
4f7774c3 N |
621 | expp = svc_export_update(&exp, expp); |
622 | else | |
623 | err = -ENOMEM; | |
1da177e4 | 624 | cache_flush(); |
4f7774c3 N |
625 | if (expp == NULL) |
626 | err = -ENOMEM; | |
627 | else | |
628 | exp_put(expp); | |
1da177e4 | 629 | out: |
af6a4e28 N |
630 | nfsd4_fslocs_free(&exp.ex_fslocs); |
631 | kfree(exp.ex_uuid); | |
b009a873 | 632 | kfree(exp.ex_path); |
1da177e4 LT |
633 | if (nd.dentry) |
634 | path_release(&nd); | |
cd156549 | 635 | out_no_path: |
1da177e4 LT |
636 | if (dom) |
637 | auth_domain_put(dom); | |
f99d49ad | 638 | kfree(buf); |
1da177e4 LT |
639 | return err; |
640 | } | |
641 | ||
93346919 MN |
642 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
643 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
1da177e4 LT |
644 | |
645 | static int svc_export_show(struct seq_file *m, | |
646 | struct cache_detail *cd, | |
647 | struct cache_head *h) | |
648 | { | |
649 | struct svc_export *exp ; | |
650 | ||
651 | if (h ==NULL) { | |
652 | seq_puts(m, "#path domain(flags)\n"); | |
653 | return 0; | |
654 | } | |
655 | exp = container_of(h, struct svc_export, h); | |
656 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
657 | seq_putc(m, '\t'); | |
658 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
659 | seq_putc(m, '('); | |
660 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 661 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
662 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
663 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
664 | if (exp->ex_uuid) { |
665 | int i; | |
666 | seq_puts(m, ",uuid="); | |
667 | for (i=0; i<16; i++) { | |
668 | if ((i&3) == 0 && i) | |
669 | seq_putc(m, ':'); | |
670 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
671 | } | |
672 | } | |
673 | } | |
1da177e4 LT |
674 | seq_puts(m, ")\n"); |
675 | return 0; | |
676 | } | |
4f7774c3 | 677 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 678 | { |
4f7774c3 N |
679 | struct svc_export *orig = container_of(a, struct svc_export, h); |
680 | struct svc_export *new = container_of(b, struct svc_export, h); | |
681 | return orig->ex_client == new->ex_client && | |
682 | orig->ex_dentry == new->ex_dentry && | |
683 | orig->ex_mnt == new->ex_mnt; | |
1da177e4 | 684 | } |
4f7774c3 N |
685 | |
686 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 687 | { |
4f7774c3 N |
688 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
689 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
690 | ||
efc36aa5 | 691 | kref_get(&item->ex_client->ref); |
1da177e4 LT |
692 | new->ex_client = item->ex_client; |
693 | new->ex_dentry = dget(item->ex_dentry); | |
694 | new->ex_mnt = mntget(item->ex_mnt); | |
b009a873 | 695 | new->ex_path = NULL; |
93346919 MN |
696 | new->ex_fslocs.locations = NULL; |
697 | new->ex_fslocs.locations_count = 0; | |
698 | new->ex_fslocs.migrated = 0; | |
1da177e4 LT |
699 | } |
700 | ||
4f7774c3 | 701 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 702 | { |
4f7774c3 N |
703 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
704 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
e677bfe4 | 705 | int i; |
4f7774c3 | 706 | |
1da177e4 LT |
707 | new->ex_flags = item->ex_flags; |
708 | new->ex_anon_uid = item->ex_anon_uid; | |
709 | new->ex_anon_gid = item->ex_anon_gid; | |
710 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
711 | new->ex_uuid = item->ex_uuid; |
712 | item->ex_uuid = NULL; | |
b009a873 BF |
713 | new->ex_path = item->ex_path; |
714 | item->ex_path = NULL; | |
93346919 MN |
715 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
716 | item->ex_fslocs.locations = NULL; | |
717 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
718 | item->ex_fslocs.locations_count = 0; | |
719 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
720 | item->ex_fslocs.migrated = 0; | |
e677bfe4 AA |
721 | new->ex_nflavors = item->ex_nflavors; |
722 | for (i = 0; i < MAX_SECINFO_LIST; i++) { | |
723 | new->ex_flavors[i] = item->ex_flavors[i]; | |
724 | } | |
1da177e4 LT |
725 | } |
726 | ||
4f7774c3 N |
727 | static struct cache_head *svc_export_alloc(void) |
728 | { | |
729 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
730 | if (i) | |
731 | return &i->h; | |
732 | else | |
733 | return NULL; | |
734 | } | |
735 | ||
736 | struct cache_detail svc_export_cache = { | |
737 | .owner = THIS_MODULE, | |
738 | .hash_size = EXPORT_HASHMAX, | |
739 | .hash_table = export_table, | |
740 | .name = "nfsd.export", | |
741 | .cache_put = svc_export_put, | |
742 | .cache_request = svc_export_request, | |
743 | .cache_parse = svc_export_parse, | |
744 | .cache_show = svc_export_show, | |
745 | .match = svc_export_match, | |
746 | .init = svc_export_init, | |
747 | .update = export_update, | |
748 | .alloc = svc_export_alloc, | |
749 | }; | |
750 | ||
751 | static struct svc_export * | |
752 | svc_export_lookup(struct svc_export *exp) | |
753 | { | |
754 | struct cache_head *ch; | |
755 | int hash; | |
756 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
757 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); | |
758 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); | |
759 | ||
760 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
761 | hash); | |
762 | if (ch) | |
763 | return container_of(ch, struct svc_export, h); | |
764 | else | |
765 | return NULL; | |
766 | } | |
767 | ||
74cae61a | 768 | static struct svc_export * |
4f7774c3 N |
769 | svc_export_update(struct svc_export *new, struct svc_export *old) |
770 | { | |
771 | struct cache_head *ch; | |
772 | int hash; | |
773 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
774 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); | |
775 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); | |
776 | ||
777 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
778 | &old->h, | |
779 | hash); | |
780 | if (ch) | |
781 | return container_of(ch, struct svc_export, h); | |
782 | else | |
783 | return NULL; | |
784 | } | |
1da177e4 LT |
785 | |
786 | ||
74cae61a | 787 | static struct svc_expkey * |
1da177e4 LT |
788 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
789 | { | |
790 | struct svc_expkey key, *ek; | |
791 | int err; | |
792 | ||
793 | if (!clp) | |
2d3bb252 | 794 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
795 | |
796 | key.ek_client = clp; | |
797 | key.ek_fsidtype = fsid_type; | |
798 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
799 | ||
8d270f7f | 800 | ek = svc_expkey_lookup(&key); |
2d3bb252 BF |
801 | if (ek == NULL) |
802 | return ERR_PTR(-ENOMEM); | |
803 | err = cache_check(&svc_expkey_cache, &ek->h, reqp); | |
804 | if (err) | |
805 | return ERR_PTR(err); | |
1da177e4 LT |
806 | return ek; |
807 | } | |
808 | ||
809 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
810 | struct svc_export *exp) | |
811 | { | |
812 | struct svc_expkey key, *ek; | |
813 | ||
814 | key.ek_client = clp; | |
815 | key.ek_fsidtype = fsid_type; | |
816 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
eab7e2e6 N |
817 | key.ek_mnt = exp->ex_mnt; |
818 | key.ek_dentry = exp->ex_dentry; | |
1da177e4 LT |
819 | key.h.expiry_time = NEVER; |
820 | key.h.flags = 0; | |
821 | ||
8d270f7f N |
822 | ek = svc_expkey_lookup(&key); |
823 | if (ek) | |
824 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 825 | if (ek) { |
baab935f | 826 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
827 | return 0; |
828 | } | |
829 | return -ENOMEM; | |
830 | } | |
831 | ||
832 | /* | |
833 | * Find the client's export entry matching xdev/xino. | |
834 | */ | |
835 | static inline struct svc_expkey * | |
836 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
837 | { | |
838 | u32 fsidv[3]; | |
839 | ||
840 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
841 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); |
842 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); | |
1da177e4 | 843 | } |
af6a4e28 N |
844 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); |
845 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); | |
1da177e4 LT |
846 | } |
847 | ||
848 | /* | |
849 | * Find the client's export entry matching fsid | |
850 | */ | |
851 | static inline struct svc_expkey * | |
852 | exp_get_fsid_key(svc_client *clp, int fsid) | |
853 | { | |
854 | u32 fsidv[2]; | |
855 | ||
af6a4e28 | 856 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); |
1da177e4 | 857 | |
af6a4e28 | 858 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); |
1da177e4 LT |
859 | } |
860 | ||
861 | svc_export * | |
862 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
863 | struct cache_req *reqp) | |
864 | { | |
865 | struct svc_export *exp, key; | |
2d3bb252 | 866 | int err; |
1da177e4 LT |
867 | |
868 | if (!clp) | |
2d3bb252 | 869 | return ERR_PTR(-ENOENT); |
1da177e4 LT |
870 | |
871 | key.ex_client = clp; | |
872 | key.ex_mnt = mnt; | |
873 | key.ex_dentry = dentry; | |
874 | ||
4f7774c3 | 875 | exp = svc_export_lookup(&key); |
2d3bb252 BF |
876 | if (exp == NULL) |
877 | return ERR_PTR(-ENOMEM); | |
878 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
879 | if (err) | |
880 | return ERR_PTR(err); | |
1da177e4 LT |
881 | return exp; |
882 | } | |
883 | ||
884 | /* | |
885 | * Find the export entry for a given dentry. | |
886 | */ | |
887 | struct svc_export * | |
888 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
889 | struct cache_req *reqp) | |
890 | { | |
891 | svc_export *exp; | |
892 | ||
893 | dget(dentry); | |
894 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
895 | ||
2d3bb252 | 896 | while (PTR_ERR(exp) == -ENOENT && !IS_ROOT(dentry)) { |
1da177e4 LT |
897 | struct dentry *parent; |
898 | ||
899 | parent = dget_parent(dentry); | |
900 | dput(dentry); | |
901 | dentry = parent; | |
902 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
903 | } | |
904 | dput(dentry); | |
905 | return exp; | |
906 | } | |
907 | ||
908 | /* | |
909 | * Hashtable locking. Write locks are placed only by user processes | |
910 | * wanting to modify export information. | |
911 | * Write locking only done in this file. Read locking | |
912 | * needed externally. | |
913 | */ | |
914 | ||
915 | static DECLARE_RWSEM(hash_sem); | |
916 | ||
917 | void | |
918 | exp_readlock(void) | |
919 | { | |
920 | down_read(&hash_sem); | |
921 | } | |
922 | ||
923 | static inline void | |
924 | exp_writelock(void) | |
925 | { | |
926 | down_write(&hash_sem); | |
927 | } | |
928 | ||
929 | void | |
930 | exp_readunlock(void) | |
931 | { | |
932 | up_read(&hash_sem); | |
933 | } | |
934 | ||
935 | static inline void | |
936 | exp_writeunlock(void) | |
937 | { | |
938 | up_write(&hash_sem); | |
939 | } | |
940 | ||
941 | static 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); | |
2d3bb252 | 949 | if (!IS_ERR(ek)) { |
1da177e4 | 950 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 951 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
952 | } |
953 | svc_expkey_cache.nextcheck = get_seconds(); | |
954 | } | |
955 | ||
956 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
957 | { | |
958 | u32 fsid[2]; | |
959 | ||
960 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
961 | return 0; | |
962 | ||
af6a4e28 N |
963 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); |
964 | return exp_set_key(clp, FSID_NUM, fsid, exp); | |
1da177e4 LT |
965 | } |
966 | ||
967 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
968 | { | |
969 | u32 fsid[2]; | |
970 | struct inode *inode = exp->ex_dentry->d_inode; | |
971 | dev_t dev = inode->i_sb->s_dev; | |
972 | ||
973 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
974 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); |
975 | return exp_set_key(clp, FSID_DEV, fsid, exp); | |
1da177e4 | 976 | } |
af6a4e28 N |
977 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); |
978 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); | |
1da177e4 LT |
979 | } |
980 | ||
981 | static void exp_unhash(struct svc_export *exp) | |
982 | { | |
983 | struct svc_expkey *ek; | |
984 | struct inode *inode = exp->ex_dentry->d_inode; | |
985 | ||
986 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
2d3bb252 | 987 | if (!IS_ERR(ek)) { |
1da177e4 | 988 | ek->h.expiry_time = get_seconds()-1; |
baab935f | 989 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
990 | } |
991 | svc_expkey_cache.nextcheck = get_seconds(); | |
992 | } | |
993 | ||
994 | /* | |
995 | * Export a file system. | |
996 | */ | |
997 | int | |
998 | exp_export(struct nfsctl_export *nxp) | |
999 | { | |
1000 | svc_client *clp; | |
1001 | struct svc_export *exp = NULL; | |
1002 | struct svc_export new; | |
1003 | struct svc_expkey *fsid_key = NULL; | |
1004 | struct nameidata nd; | |
1005 | int err; | |
1006 | ||
1007 | /* Consistency check */ | |
1008 | err = -EINVAL; | |
1009 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1010 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1011 | goto out; | |
1012 | ||
1013 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
1014 | nxp->ex_client, nxp->ex_path, | |
1015 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
1016 | nxp->ex_flags); | |
1017 | ||
1018 | /* Try to lock the export table for update */ | |
1019 | exp_writelock(); | |
1020 | ||
1021 | /* Look up client info */ | |
1022 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
1023 | goto out_unlock; | |
1024 | ||
1025 | ||
1026 | /* Look up the dentry */ | |
1027 | err = path_lookup(nxp->ex_path, 0, &nd); | |
1028 | if (err) | |
1029 | goto out_unlock; | |
1030 | err = -EINVAL; | |
1031 | ||
1032 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); | |
1033 | ||
f988443a N |
1034 | memset(&new, 0, sizeof(new)); |
1035 | ||
1da177e4 LT |
1036 | /* must make sure there won't be an ex_fsid clash */ |
1037 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
2d3bb252 | 1038 | (!IS_ERR(fsid_key = exp_get_fsid_key(clp, nxp->ex_dev))) && |
eab7e2e6 N |
1039 | fsid_key->ek_mnt && |
1040 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) | |
1da177e4 LT |
1041 | goto finish; |
1042 | ||
2d3bb252 | 1043 | if (!IS_ERR(exp)) { |
1da177e4 LT |
1044 | /* just a flags/id/fsid update */ |
1045 | ||
1046 | exp_fsid_unhash(exp); | |
1047 | exp->ex_flags = nxp->ex_flags; | |
1048 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
1049 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
1050 | exp->ex_fsid = nxp->ex_dev; | |
1051 | ||
1052 | err = exp_fsid_hash(clp, exp); | |
1053 | goto finish; | |
1054 | } | |
1055 | ||
af6a4e28 | 1056 | err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL); |
1da177e4 LT |
1057 | if (err) goto finish; |
1058 | ||
1059 | err = -ENOMEM; | |
1060 | ||
1061 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
1062 | ||
1063 | new.h.expiry_time = NEVER; | |
1064 | new.h.flags = 0; | |
f988443a N |
1065 | new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL); |
1066 | if (!new.ex_path) | |
1067 | goto finish; | |
1da177e4 LT |
1068 | new.ex_client = clp; |
1069 | new.ex_mnt = nd.mnt; | |
1070 | new.ex_dentry = nd.dentry; | |
1071 | new.ex_flags = nxp->ex_flags; | |
1072 | new.ex_anon_uid = nxp->ex_anon_uid; | |
1073 | new.ex_anon_gid = nxp->ex_anon_gid; | |
1074 | new.ex_fsid = nxp->ex_dev; | |
1075 | ||
4f7774c3 N |
1076 | exp = svc_export_lookup(&new); |
1077 | if (exp) | |
1078 | exp = svc_export_update(&new, exp); | |
1da177e4 | 1079 | |
4f7774c3 | 1080 | if (!exp) |
1da177e4 LT |
1081 | goto finish; |
1082 | ||
1da177e4 LT |
1083 | if (exp_hash(clp, exp) || |
1084 | exp_fsid_hash(clp, exp)) { | |
1085 | /* failed to create at least one index */ | |
1086 | exp_do_unexport(exp); | |
1087 | cache_flush(); | |
f988443a N |
1088 | } else |
1089 | err = 0; | |
1da177e4 | 1090 | finish: |
f988443a N |
1091 | if (new.ex_path) |
1092 | kfree(new.ex_path); | |
1da177e4 LT |
1093 | if (exp) |
1094 | exp_put(exp); | |
1095 | if (fsid_key && !IS_ERR(fsid_key)) | |
baab935f | 1096 | cache_put(&fsid_key->h, &svc_expkey_cache); |
1da177e4 LT |
1097 | if (clp) |
1098 | auth_domain_put(clp); | |
1099 | path_release(&nd); | |
1100 | out_unlock: | |
1101 | exp_writeunlock(); | |
1102 | out: | |
1103 | return err; | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Unexport a file system. The export entry has already | |
1108 | * been removed from the client's list of exported fs's. | |
1109 | */ | |
1110 | static void | |
1111 | exp_do_unexport(svc_export *unexp) | |
1112 | { | |
1113 | unexp->h.expiry_time = get_seconds()-1; | |
1114 | svc_export_cache.nextcheck = get_seconds(); | |
1115 | exp_unhash(unexp); | |
1116 | exp_fsid_unhash(unexp); | |
1117 | } | |
1118 | ||
1119 | ||
1120 | /* | |
1121 | * unexport syscall. | |
1122 | */ | |
1123 | int | |
1124 | exp_unexport(struct nfsctl_export *nxp) | |
1125 | { | |
1126 | struct auth_domain *dom; | |
1127 | svc_export *exp; | |
1128 | struct nameidata nd; | |
1129 | int err; | |
1130 | ||
1131 | /* Consistency check */ | |
1132 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1133 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1134 | return -EINVAL; | |
1135 | ||
1136 | exp_writelock(); | |
1137 | ||
1138 | err = -EINVAL; | |
1139 | dom = auth_domain_find(nxp->ex_client); | |
1140 | if (!dom) { | |
1141 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
1142 | goto out_unlock; | |
1143 | } | |
1144 | ||
1145 | err = path_lookup(nxp->ex_path, 0, &nd); | |
1146 | if (err) | |
1147 | goto out_domain; | |
1148 | ||
1149 | err = -EINVAL; | |
1150 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); | |
1151 | path_release(&nd); | |
2d3bb252 | 1152 | if (IS_ERR(exp)) |
1da177e4 LT |
1153 | goto out_domain; |
1154 | ||
1155 | exp_do_unexport(exp); | |
1156 | exp_put(exp); | |
1157 | err = 0; | |
1158 | ||
1159 | out_domain: | |
1160 | auth_domain_put(dom); | |
1161 | cache_flush(); | |
1162 | out_unlock: | |
1163 | exp_writeunlock(); | |
1164 | return err; | |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * Obtain the root fh on behalf of a client. | |
1169 | * This could be done in user space, but I feel that it adds some safety | |
1170 | * since its harder to fool a kernel module than a user space program. | |
1171 | */ | |
1172 | int | |
1173 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
1174 | { | |
1175 | struct svc_export *exp; | |
1176 | struct nameidata nd; | |
1177 | struct inode *inode; | |
1178 | struct svc_fh fh; | |
1179 | int err; | |
1180 | ||
1181 | err = -EPERM; | |
1182 | /* NB: we probably ought to check that it's NUL-terminated */ | |
1183 | if (path_lookup(path, 0, &nd)) { | |
1184 | printk("nfsd: exp_rootfh path not found %s", path); | |
1185 | return err; | |
1186 | } | |
1187 | inode = nd.dentry->d_inode; | |
1188 | ||
1189 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
1190 | path, nd.dentry, clp->name, | |
1191 | inode->i_sb->s_id, inode->i_ino); | |
1192 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); | |
4b41bd85 BF |
1193 | if (IS_ERR(exp)) { |
1194 | err = PTR_ERR(exp); | |
1195 | goto out; | |
1196 | } | |
1da177e4 LT |
1197 | |
1198 | /* | |
1199 | * fh must be initialized before calling fh_compose | |
1200 | */ | |
1201 | fh_init(&fh, maxsize); | |
1202 | if (fh_compose(&fh, exp, nd.dentry, NULL)) | |
1203 | err = -EINVAL; | |
1204 | else | |
1205 | err = 0; | |
1206 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1207 | fh_put(&fh); | |
1208 | exp_put(exp); | |
1209 | out: | |
1210 | path_release(&nd); | |
1211 | return err; | |
1212 | } | |
1213 | ||
eab7e2e6 N |
1214 | struct svc_export * |
1215 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, | |
1216 | struct cache_req *reqp) | |
1217 | { | |
1218 | struct svc_export *exp; | |
1219 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
2d3bb252 | 1220 | if (IS_ERR(ek)) |
eab7e2e6 N |
1221 | return ERR_PTR(PTR_ERR(ek)); |
1222 | ||
1223 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
baab935f | 1224 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 | 1225 | |
2d3bb252 | 1226 | if (IS_ERR(exp)) |
eab7e2e6 N |
1227 | return ERR_PTR(PTR_ERR(exp)); |
1228 | return exp; | |
1229 | } | |
1230 | ||
1231 | ||
1da177e4 LT |
1232 | /* |
1233 | * Called when we need the filehandle for the root of the pseudofs, | |
1234 | * for a given NFSv4 client. The root is defined to be the | |
1235 | * export point with fsid==0 | |
1236 | */ | |
c7afef1f | 1237 | __be32 |
df547efb | 1238 | exp_pseudoroot(struct svc_rqst *rqstp, struct svc_fh *fhp) |
1da177e4 | 1239 | { |
eab7e2e6 | 1240 | struct svc_export *exp; |
c7afef1f | 1241 | __be32 rv; |
1da177e4 LT |
1242 | u32 fsidv[2]; |
1243 | ||
af6a4e28 | 1244 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); |
1da177e4 | 1245 | |
df547efb | 1246 | exp = exp_find(rqstp->rq_client, FSID_NUM, fsidv, rqstp->rq_chandle); |
2d3bb252 BF |
1247 | if (PTR_ERR(exp) == -ENOENT) |
1248 | return nfserr_perm; | |
6899320c BF |
1249 | if (IS_ERR(exp)) |
1250 | return nfserrno(PTR_ERR(exp)); | |
d0ebd9c0 BF |
1251 | rv = fh_compose(fhp, exp, exp->ex_dentry, NULL); |
1252 | exp_put(exp); | |
1da177e4 LT |
1253 | return rv; |
1254 | } | |
1255 | ||
1256 | /* Iterator */ | |
1257 | ||
1258 | static void *e_start(struct seq_file *m, loff_t *pos) | |
896440d5 | 1259 | __acquires(svc_export_cache.hash_lock) |
1da177e4 LT |
1260 | { |
1261 | loff_t n = *pos; | |
1262 | unsigned hash, export; | |
1263 | struct cache_head *ch; | |
1264 | ||
1265 | exp_readlock(); | |
1266 | read_lock(&svc_export_cache.hash_lock); | |
1267 | if (!n--) | |
bc6f02e5 | 1268 | return SEQ_START_TOKEN; |
1da177e4 LT |
1269 | hash = n >> 32; |
1270 | export = n & ((1LL<<32) - 1); | |
1271 | ||
1272 | ||
1273 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1274 | if (!export--) | |
1275 | return ch; | |
1276 | n &= ~((1LL<<32) - 1); | |
1277 | do { | |
1278 | hash++; | |
1279 | n += 1LL<<32; | |
1280 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1281 | if (hash >= EXPORT_HASHMAX) | |
1282 | return NULL; | |
1283 | *pos = n+1; | |
1284 | return export_table[hash]; | |
1285 | } | |
1286 | ||
1287 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1288 | { | |
1289 | struct cache_head *ch = p; | |
1290 | int hash = (*pos >> 32); | |
1291 | ||
bc6f02e5 | 1292 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1293 | hash = 0; |
1294 | else if (ch->next == NULL) { | |
1295 | hash++; | |
1296 | *pos += 1LL<<32; | |
1297 | } else { | |
1298 | ++*pos; | |
1299 | return ch->next; | |
1300 | } | |
1301 | *pos &= ~((1LL<<32) - 1); | |
1302 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1303 | hash++; | |
1304 | *pos += 1LL<<32; | |
1305 | } | |
1306 | if (hash >= EXPORT_HASHMAX) | |
1307 | return NULL; | |
1308 | ++*pos; | |
1309 | return export_table[hash]; | |
1310 | } | |
1311 | ||
1312 | static void e_stop(struct seq_file *m, void *p) | |
896440d5 | 1313 | __releases(svc_export_cache.hash_lock) |
1da177e4 LT |
1314 | { |
1315 | read_unlock(&svc_export_cache.hash_lock); | |
1316 | exp_readunlock(); | |
1317 | } | |
1318 | ||
1319 | static struct flags { | |
1320 | int flag; | |
1321 | char *name[2]; | |
1322 | } expflags[] = { | |
1323 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1324 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1325 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1326 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1327 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1328 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1329 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1330 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1331 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1332 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1333 | #ifdef MSNFS | |
1334 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1335 | #endif | |
1336 | { 0, {"", ""}} | |
1337 | }; | |
1338 | ||
93346919 MN |
1339 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1340 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1da177e4 LT |
1341 | { |
1342 | int first = 0; | |
1343 | struct flags *flg; | |
1344 | ||
1345 | for (flg = expflags; flg->flag; flg++) { | |
1346 | int state = (flg->flag & flag)?0:1; | |
1347 | if (*flg->name[state]) | |
1348 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1349 | } | |
1350 | if (flag & NFSEXP_FSID) | |
1351 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); | |
1352 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) | |
1353 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); | |
1354 | if (anong != (gid_t)-2 && anong != (0x10000-2)) | |
1355 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); | |
93346919 MN |
1356 | if (fsloc && fsloc->locations_count > 0) { |
1357 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1358 | int i; | |
1359 | ||
1360 | seq_printf(m, "%s%s=", first++?",":"", loctype); | |
1361 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); | |
1362 | seq_putc(m, '@'); | |
1363 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1364 | for (i = 1; i < fsloc->locations_count; i++) { | |
1365 | seq_putc(m, ';'); | |
1366 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1367 | seq_putc(m, '@'); | |
1368 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1369 | } | |
1370 | } | |
1da177e4 LT |
1371 | } |
1372 | ||
1373 | static int e_show(struct seq_file *m, void *p) | |
1374 | { | |
1375 | struct cache_head *cp = p; | |
1376 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1da177e4 | 1377 | |
bc6f02e5 | 1378 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1379 | seq_puts(m, "# Version 1.1\n"); |
1380 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1381 | return 0; | |
1382 | } | |
1383 | ||
1da177e4 LT |
1384 | cache_get(&exp->h); |
1385 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1386 | return 0; | |
baab935f | 1387 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
1388 | return svc_export_show(m, &svc_export_cache, cp); |
1389 | } | |
1390 | ||
1391 | struct seq_operations nfs_exports_op = { | |
1392 | .start = e_start, | |
1393 | .next = e_next, | |
1394 | .stop = e_stop, | |
1395 | .show = e_show, | |
1396 | }; | |
1397 | ||
1398 | /* | |
1399 | * Add or modify a client. | |
1400 | * Change requests may involve the list of host addresses. The list of | |
1401 | * exports and possibly existing uid maps are left untouched. | |
1402 | */ | |
1403 | int | |
1404 | exp_addclient(struct nfsctl_client *ncp) | |
1405 | { | |
1406 | struct auth_domain *dom; | |
1407 | int i, err; | |
1408 | ||
1409 | /* First, consistency check. */ | |
1410 | err = -EINVAL; | |
1411 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1412 | goto out; | |
1413 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1414 | goto out; | |
1415 | ||
1416 | /* Lock the hashtable */ | |
1417 | exp_writelock(); | |
1418 | ||
1419 | dom = unix_domain_find(ncp->cl_ident); | |
1420 | ||
1421 | err = -ENOMEM; | |
1422 | if (!dom) | |
1423 | goto out_unlock; | |
1424 | ||
1425 | /* Insert client into hashtable. */ | |
1426 | for (i = 0; i < ncp->cl_naddr; i++) | |
1427 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); | |
1428 | ||
1429 | auth_unix_forget_old(dom); | |
1430 | auth_domain_put(dom); | |
1431 | ||
1432 | err = 0; | |
1433 | ||
1434 | out_unlock: | |
1435 | exp_writeunlock(); | |
1436 | out: | |
1437 | return err; | |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * Delete a client given an identifier. | |
1442 | */ | |
1443 | int | |
1444 | exp_delclient(struct nfsctl_client *ncp) | |
1445 | { | |
1446 | int err; | |
1447 | struct auth_domain *dom; | |
1448 | ||
1449 | err = -EINVAL; | |
1450 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1451 | goto out; | |
1452 | ||
1453 | /* Lock the hashtable */ | |
1454 | exp_writelock(); | |
1455 | ||
1456 | dom = auth_domain_find(ncp->cl_ident); | |
1457 | /* just make sure that no addresses work | |
1458 | * and that it will expire soon | |
1459 | */ | |
1460 | if (dom) { | |
1461 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1462 | auth_domain_put(dom); |
1463 | } | |
1464 | ||
1465 | exp_writeunlock(); | |
1466 | out: | |
1467 | return err; | |
1468 | } | |
1469 | ||
1470 | /* | |
1471 | * Verify that string is non-empty and does not exceed max length. | |
1472 | */ | |
1473 | static int | |
1474 | exp_verify_string(char *cp, int max) | |
1475 | { | |
1476 | int i; | |
1477 | ||
1478 | for (i = 0; i < max; i++) | |
1479 | if (!cp[i]) | |
1480 | return i; | |
1481 | cp[i] = 0; | |
1482 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1483 | return 0; | |
1484 | } | |
1485 | ||
1486 | /* | |
1487 | * Initialize the exports module. | |
1488 | */ | |
1489 | void | |
1490 | nfsd_export_init(void) | |
1491 | { | |
1492 | dprintk("nfsd: initializing export module.\n"); | |
1493 | ||
1494 | cache_register(&svc_export_cache); | |
1495 | cache_register(&svc_expkey_cache); | |
1496 | ||
1497 | } | |
1498 | ||
1499 | /* | |
1500 | * Flush exports table - called when last nfsd thread is killed | |
1501 | */ | |
1502 | void | |
1503 | nfsd_export_flush(void) | |
1504 | { | |
1505 | exp_writelock(); | |
1506 | cache_purge(&svc_expkey_cache); | |
1507 | cache_purge(&svc_export_cache); | |
1508 | exp_writeunlock(); | |
1509 | } | |
1510 | ||
1511 | /* | |
1512 | * Shutdown the exports module. | |
1513 | */ | |
1514 | void | |
1515 | nfsd_export_shutdown(void) | |
1516 | { | |
1517 | ||
1518 | dprintk("nfsd: shutting down export module.\n"); | |
1519 | ||
1520 | exp_writelock(); | |
1521 | ||
1522 | if (cache_unregister(&svc_expkey_cache)) | |
1523 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); | |
1524 | if (cache_unregister(&svc_export_cache)) | |
1525 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); | |
1526 | svcauth_unix_purge(); | |
1527 | ||
1528 | exp_writeunlock(); | |
1529 | dprintk("nfsd: export shutdown complete.\n"); | |
1530 | } |