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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> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/stat.h> | |
21 | #include <linux/in.h> | |
22 | #include <linux/seq_file.h> | |
23 | #include <linux/syscalls.h> | |
24 | #include <linux/rwsem.h> | |
25 | #include <linux/dcache.h> | |
26 | #include <linux/namei.h> | |
27 | #include <linux/mount.h> | |
28 | #include <linux/hash.h> | |
f35279d3 | 29 | #include <linux/module.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> | |
36 | ||
37 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT | |
38 | #define NFSD_PARANOIA 1 | |
39 | ||
40 | typedef struct auth_domain svc_client; | |
41 | typedef struct svc_export svc_export; | |
42 | ||
43 | static void exp_do_unexport(svc_export *unexp); | |
44 | static int exp_verify_string(char *cp, int max); | |
45 | ||
46 | /* | |
47 | * We have two caches. | |
48 | * One maps client+vfsmnt+dentry to export options - the export map | |
49 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
50 | * | |
51 | * The export options are actually stored in the first map, and the | |
52 | * second map contains a reference to the entry in the first map. | |
53 | */ | |
54 | ||
55 | #define EXPKEY_HASHBITS 8 | |
56 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
57 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
58 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
59 | ||
baab935f | 60 | void expkey_put(struct kref *ref) |
1da177e4 | 61 | { |
baab935f N |
62 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
63 | ||
64 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
65 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) { | |
66 | dput(key->ek_dentry); | |
67 | mntput(key->ek_mnt); | |
1da177e4 | 68 | } |
baab935f N |
69 | auth_domain_put(key->ek_client); |
70 | kfree(key); | |
1da177e4 LT |
71 | } |
72 | ||
73 | static void expkey_request(struct cache_detail *cd, | |
74 | struct cache_head *h, | |
75 | char **bpp, int *blen) | |
76 | { | |
77 | /* client fsidtype \xfsid */ | |
78 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
79 | char type[5]; | |
80 | ||
81 | qword_add(bpp, blen, ek->ek_client->name); | |
82 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
83 | qword_add(bpp, blen, type); | |
84 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
85 | (*bpp)[-1] = '\n'; | |
86 | } | |
87 | ||
8d270f7f N |
88 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
89 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); | |
1da177e4 LT |
90 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
91 | { | |
92 | /* client fsidtype fsid [path] */ | |
93 | char *buf; | |
94 | int len; | |
95 | struct auth_domain *dom = NULL; | |
96 | int err; | |
97 | int fsidtype; | |
98 | char *ep; | |
99 | struct svc_expkey key; | |
8d270f7f | 100 | struct svc_expkey *ek; |
1da177e4 LT |
101 | |
102 | if (mesg[mlen-1] != '\n') | |
103 | return -EINVAL; | |
104 | mesg[mlen-1] = 0; | |
105 | ||
106 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
107 | err = -ENOMEM; | |
108 | if (!buf) goto out; | |
109 | ||
110 | err = -EINVAL; | |
111 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
112 | goto out; | |
113 | ||
114 | err = -ENOENT; | |
115 | dom = auth_domain_find(buf); | |
116 | if (!dom) | |
117 | goto out; | |
118 | dprintk("found domain %s\n", buf); | |
119 | ||
120 | err = -EINVAL; | |
121 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
122 | goto out; | |
123 | fsidtype = simple_strtoul(buf, &ep, 10); | |
124 | if (*ep) | |
125 | goto out; | |
126 | dprintk("found fsidtype %d\n", fsidtype); | |
127 | if (fsidtype > 2) | |
128 | goto out; | |
129 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
130 | goto out; | |
131 | dprintk("found fsid length %d\n", len); | |
132 | if (len != key_len(fsidtype)) | |
133 | goto out; | |
134 | ||
135 | /* OK, we seem to have a valid key */ | |
136 | key.h.flags = 0; | |
137 | key.h.expiry_time = get_expiry(&mesg); | |
138 | if (key.h.expiry_time == 0) | |
139 | goto out; | |
140 | ||
141 | key.ek_client = dom; | |
142 | key.ek_fsidtype = fsidtype; | |
143 | memcpy(key.ek_fsid, buf, len); | |
144 | ||
8d270f7f N |
145 | ek = svc_expkey_lookup(&key); |
146 | err = -ENOMEM; | |
147 | if (!ek) | |
148 | goto out; | |
149 | ||
1da177e4 | 150 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 151 | err = -EINVAL; |
1da177e4 LT |
152 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
153 | goto out; | |
154 | dprintk("Path seems to be <%s>\n", buf); | |
155 | err = 0; | |
156 | if (len == 0) { | |
1da177e4 | 157 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
8d270f7f | 158 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 159 | if (ek) |
baab935f | 160 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f | 161 | else err = -ENOMEM; |
1da177e4 LT |
162 | } else { |
163 | struct nameidata nd; | |
1da177e4 LT |
164 | err = path_lookup(buf, 0, &nd); |
165 | if (err) | |
166 | goto out; | |
167 | ||
168 | dprintk("Found the path %s\n", buf); | |
eab7e2e6 N |
169 | key.ek_mnt = nd.mnt; |
170 | key.ek_dentry = nd.dentry; | |
1da177e4 | 171 | |
8d270f7f | 172 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 173 | if (ek) |
baab935f | 174 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f N |
175 | else |
176 | err = -ENOMEM; | |
1da177e4 LT |
177 | path_release(&nd); |
178 | } | |
179 | cache_flush(); | |
180 | out: | |
181 | if (dom) | |
182 | auth_domain_put(dom); | |
f99d49ad | 183 | kfree(buf); |
1da177e4 LT |
184 | return err; |
185 | } | |
186 | ||
187 | static int expkey_show(struct seq_file *m, | |
188 | struct cache_detail *cd, | |
189 | struct cache_head *h) | |
190 | { | |
191 | struct svc_expkey *ek ; | |
192 | ||
193 | if (h ==NULL) { | |
194 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
195 | return 0; | |
196 | } | |
197 | ek = container_of(h, struct svc_expkey, h); | |
198 | seq_printf(m, "%s %d 0x%08x", ek->ek_client->name, | |
199 | ek->ek_fsidtype, ek->ek_fsid[0]); | |
200 | if (ek->ek_fsidtype != 1) | |
201 | seq_printf(m, "%08x", ek->ek_fsid[1]); | |
202 | if (ek->ek_fsidtype == 2) | |
203 | seq_printf(m, "%08x", ek->ek_fsid[2]); | |
204 | if (test_bit(CACHE_VALID, &h->flags) && | |
205 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
206 | seq_printf(m, " "); | |
eab7e2e6 | 207 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
1da177e4 LT |
208 | } |
209 | seq_printf(m, "\n"); | |
210 | return 0; | |
211 | } | |
1da177e4 | 212 | |
8d270f7f | 213 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 214 | { |
8d270f7f N |
215 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
216 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
217 | ||
218 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
219 | orig->ek_client != new->ek_client || | |
220 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
221 | return 0; |
222 | return 1; | |
223 | } | |
224 | ||
8d270f7f N |
225 | static inline void expkey_init(struct cache_head *cnew, |
226 | struct cache_head *citem) | |
1da177e4 | 227 | { |
8d270f7f N |
228 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
229 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
230 | ||
efc36aa5 | 231 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
232 | new->ek_client = item->ek_client; |
233 | new->ek_fsidtype = item->ek_fsidtype; | |
234 | new->ek_fsid[0] = item->ek_fsid[0]; | |
235 | new->ek_fsid[1] = item->ek_fsid[1]; | |
236 | new->ek_fsid[2] = item->ek_fsid[2]; | |
237 | } | |
238 | ||
8d270f7f N |
239 | static inline void expkey_update(struct cache_head *cnew, |
240 | struct cache_head *citem) | |
1da177e4 | 241 | { |
8d270f7f N |
242 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
243 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
244 | ||
eab7e2e6 N |
245 | new->ek_mnt = mntget(item->ek_mnt); |
246 | new->ek_dentry = dget(item->ek_dentry); | |
1da177e4 LT |
247 | } |
248 | ||
8d270f7f N |
249 | static struct cache_head *expkey_alloc(void) |
250 | { | |
251 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
252 | if (i) | |
253 | return &i->h; | |
254 | else | |
255 | return NULL; | |
256 | } | |
257 | ||
258 | struct cache_detail svc_expkey_cache = { | |
259 | .owner = THIS_MODULE, | |
260 | .hash_size = EXPKEY_HASHMAX, | |
261 | .hash_table = expkey_table, | |
262 | .name = "nfsd.fh", | |
263 | .cache_put = expkey_put, | |
264 | .cache_request = expkey_request, | |
265 | .cache_parse = expkey_parse, | |
266 | .cache_show = expkey_show, | |
267 | .match = expkey_match, | |
268 | .init = expkey_init, | |
269 | .update = expkey_update, | |
270 | .alloc = expkey_alloc, | |
271 | }; | |
272 | ||
273 | static struct svc_expkey * | |
274 | svc_expkey_lookup(struct svc_expkey *item) | |
275 | { | |
276 | struct cache_head *ch; | |
277 | int hash = item->ek_fsidtype; | |
278 | char * cp = (char*)item->ek_fsid; | |
279 | int len = key_len(item->ek_fsidtype); | |
280 | ||
281 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
282 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
283 | hash &= EXPKEY_HASHMASK; | |
284 | ||
285 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
286 | hash); | |
287 | if (ch) | |
288 | return container_of(ch, struct svc_expkey, h); | |
289 | else | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | static struct svc_expkey * | |
294 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
295 | { | |
296 | struct cache_head *ch; | |
297 | int hash = new->ek_fsidtype; | |
298 | char * cp = (char*)new->ek_fsid; | |
299 | int len = key_len(new->ek_fsidtype); | |
300 | ||
301 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
302 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); | |
303 | hash &= EXPKEY_HASHMASK; | |
304 | ||
305 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
306 | &old->h, hash); | |
307 | if (ch) | |
308 | return container_of(ch, struct svc_expkey, h); | |
309 | else | |
310 | return NULL; | |
311 | } | |
312 | ||
1da177e4 LT |
313 | |
314 | #define EXPORT_HASHBITS 8 | |
315 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
316 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
317 | ||
318 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
319 | ||
baab935f | 320 | static void svc_export_put(struct kref *ref) |
1da177e4 | 321 | { |
baab935f N |
322 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
323 | dput(exp->ex_dentry); | |
324 | mntput(exp->ex_mnt); | |
325 | auth_domain_put(exp->ex_client); | |
326 | kfree(exp); | |
1da177e4 LT |
327 | } |
328 | ||
329 | static void svc_export_request(struct cache_detail *cd, | |
330 | struct cache_head *h, | |
331 | char **bpp, int *blen) | |
332 | { | |
333 | /* client path */ | |
334 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
335 | char *pth; | |
336 | ||
337 | qword_add(bpp, blen, exp->ex_client->name); | |
338 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
339 | if (IS_ERR(pth)) { | |
340 | /* is this correct? */ | |
341 | (*bpp)[0] = '\n'; | |
342 | return; | |
343 | } | |
344 | qword_add(bpp, blen, pth); | |
345 | (*bpp)[-1] = '\n'; | |
346 | } | |
347 | ||
4f7774c3 N |
348 | struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old); |
349 | static struct svc_export *svc_export_lookup(struct svc_export *); | |
1da177e4 LT |
350 | |
351 | static int check_export(struct inode *inode, int flags) | |
352 | { | |
353 | ||
354 | /* We currently export only dirs and regular files. | |
355 | * This is what umountd does. | |
356 | */ | |
357 | if (!S_ISDIR(inode->i_mode) && | |
358 | !S_ISREG(inode->i_mode)) | |
359 | return -ENOTDIR; | |
360 | ||
361 | /* There are two requirements on a filesystem to be exportable. | |
362 | * 1: We must be able to identify the filesystem from a number. | |
363 | * either a device number (so FS_REQUIRES_DEV needed) | |
364 | * or an FSID number (so NFSEXP_FSID needed). | |
365 | * 2: We must be able to find an inode from a filehandle. | |
366 | * This means that s_export_op must be set. | |
367 | */ | |
368 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
369 | !(flags & NFSEXP_FSID)) { | |
370 | dprintk("exp_export: export of non-dev fs without fsid"); | |
371 | return -EINVAL; | |
372 | } | |
373 | if (!inode->i_sb->s_export_op) { | |
374 | dprintk("exp_export: export of invalid fs type.\n"); | |
375 | return -EINVAL; | |
376 | } | |
377 | ||
378 | /* Ok, we can export it */; | |
379 | if (!inode->i_sb->s_export_op->find_exported_dentry) | |
380 | inode->i_sb->s_export_op->find_exported_dentry = | |
381 | find_exported_dentry; | |
382 | return 0; | |
383 | ||
384 | } | |
385 | ||
386 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) | |
387 | { | |
388 | /* client path expiry [flags anonuid anongid fsid] */ | |
389 | char *buf; | |
390 | int len; | |
391 | int err; | |
392 | struct auth_domain *dom = NULL; | |
393 | struct nameidata nd; | |
394 | struct svc_export exp, *expp; | |
395 | int an_int; | |
396 | ||
397 | nd.dentry = NULL; | |
398 | ||
399 | if (mesg[mlen-1] != '\n') | |
400 | return -EINVAL; | |
401 | mesg[mlen-1] = 0; | |
402 | ||
403 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
404 | err = -ENOMEM; | |
405 | if (!buf) goto out; | |
406 | ||
407 | /* client */ | |
408 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
409 | err = -EINVAL; | |
410 | if (len <= 0) goto out; | |
411 | ||
412 | err = -ENOENT; | |
413 | dom = auth_domain_find(buf); | |
414 | if (!dom) | |
415 | goto out; | |
416 | ||
417 | /* path */ | |
418 | err = -EINVAL; | |
419 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
420 | goto out; | |
421 | err = path_lookup(buf, 0, &nd); | |
422 | if (err) goto out; | |
423 | ||
424 | exp.h.flags = 0; | |
425 | exp.ex_client = dom; | |
426 | exp.ex_mnt = nd.mnt; | |
427 | exp.ex_dentry = nd.dentry; | |
428 | ||
429 | /* expiry */ | |
430 | err = -EINVAL; | |
431 | exp.h.expiry_time = get_expiry(&mesg); | |
432 | if (exp.h.expiry_time == 0) | |
433 | goto out; | |
434 | ||
435 | /* flags */ | |
436 | err = get_int(&mesg, &an_int); | |
437 | if (err == -ENOENT) | |
438 | set_bit(CACHE_NEGATIVE, &exp.h.flags); | |
439 | else { | |
440 | if (err || an_int < 0) goto out; | |
441 | exp.ex_flags= an_int; | |
442 | ||
443 | /* anon uid */ | |
444 | err = get_int(&mesg, &an_int); | |
445 | if (err) goto out; | |
446 | exp.ex_anon_uid= an_int; | |
447 | ||
448 | /* anon gid */ | |
449 | err = get_int(&mesg, &an_int); | |
450 | if (err) goto out; | |
451 | exp.ex_anon_gid= an_int; | |
452 | ||
453 | /* fsid */ | |
454 | err = get_int(&mesg, &an_int); | |
455 | if (err) goto out; | |
456 | exp.ex_fsid = an_int; | |
457 | ||
458 | err = check_export(nd.dentry->d_inode, exp.ex_flags); | |
459 | if (err) goto out; | |
460 | } | |
461 | ||
4f7774c3 | 462 | expp = svc_export_lookup(&exp); |
1da177e4 | 463 | if (expp) |
4f7774c3 N |
464 | expp = svc_export_update(&exp, expp); |
465 | else | |
466 | err = -ENOMEM; | |
1da177e4 | 467 | cache_flush(); |
4f7774c3 N |
468 | if (expp == NULL) |
469 | err = -ENOMEM; | |
470 | else | |
471 | exp_put(expp); | |
1da177e4 LT |
472 | out: |
473 | if (nd.dentry) | |
474 | path_release(&nd); | |
475 | if (dom) | |
476 | auth_domain_put(dom); | |
f99d49ad | 477 | kfree(buf); |
1da177e4 LT |
478 | return err; |
479 | } | |
480 | ||
481 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong); | |
482 | ||
483 | static int svc_export_show(struct seq_file *m, | |
484 | struct cache_detail *cd, | |
485 | struct cache_head *h) | |
486 | { | |
487 | struct svc_export *exp ; | |
488 | ||
489 | if (h ==NULL) { | |
490 | seq_puts(m, "#path domain(flags)\n"); | |
491 | return 0; | |
492 | } | |
493 | exp = container_of(h, struct svc_export, h); | |
494 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
495 | seq_putc(m, '\t'); | |
496 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
497 | seq_putc(m, '('); | |
498 | if (test_bit(CACHE_VALID, &h->flags) && | |
499 | !test_bit(CACHE_NEGATIVE, &h->flags)) | |
500 | exp_flags(m, exp->ex_flags, exp->ex_fsid, | |
501 | exp->ex_anon_uid, exp->ex_anon_gid); | |
502 | seq_puts(m, ")\n"); | |
503 | return 0; | |
504 | } | |
4f7774c3 | 505 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 506 | { |
4f7774c3 N |
507 | struct svc_export *orig = container_of(a, struct svc_export, h); |
508 | struct svc_export *new = container_of(b, struct svc_export, h); | |
509 | return orig->ex_client == new->ex_client && | |
510 | orig->ex_dentry == new->ex_dentry && | |
511 | orig->ex_mnt == new->ex_mnt; | |
1da177e4 | 512 | } |
4f7774c3 N |
513 | |
514 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 515 | { |
4f7774c3 N |
516 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
517 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
518 | ||
efc36aa5 | 519 | kref_get(&item->ex_client->ref); |
1da177e4 LT |
520 | new->ex_client = item->ex_client; |
521 | new->ex_dentry = dget(item->ex_dentry); | |
522 | new->ex_mnt = mntget(item->ex_mnt); | |
523 | } | |
524 | ||
4f7774c3 | 525 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 526 | { |
4f7774c3 N |
527 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
528 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
529 | ||
1da177e4 LT |
530 | new->ex_flags = item->ex_flags; |
531 | new->ex_anon_uid = item->ex_anon_uid; | |
532 | new->ex_anon_gid = item->ex_anon_gid; | |
533 | new->ex_fsid = item->ex_fsid; | |
534 | } | |
535 | ||
4f7774c3 N |
536 | static struct cache_head *svc_export_alloc(void) |
537 | { | |
538 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
539 | if (i) | |
540 | return &i->h; | |
541 | else | |
542 | return NULL; | |
543 | } | |
544 | ||
545 | struct cache_detail svc_export_cache = { | |
546 | .owner = THIS_MODULE, | |
547 | .hash_size = EXPORT_HASHMAX, | |
548 | .hash_table = export_table, | |
549 | .name = "nfsd.export", | |
550 | .cache_put = svc_export_put, | |
551 | .cache_request = svc_export_request, | |
552 | .cache_parse = svc_export_parse, | |
553 | .cache_show = svc_export_show, | |
554 | .match = svc_export_match, | |
555 | .init = svc_export_init, | |
556 | .update = export_update, | |
557 | .alloc = svc_export_alloc, | |
558 | }; | |
559 | ||
560 | static struct svc_export * | |
561 | svc_export_lookup(struct svc_export *exp) | |
562 | { | |
563 | struct cache_head *ch; | |
564 | int hash; | |
565 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
566 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); | |
567 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); | |
568 | ||
569 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
570 | hash); | |
571 | if (ch) | |
572 | return container_of(ch, struct svc_export, h); | |
573 | else | |
574 | return NULL; | |
575 | } | |
576 | ||
577 | struct svc_export * | |
578 | svc_export_update(struct svc_export *new, struct svc_export *old) | |
579 | { | |
580 | struct cache_head *ch; | |
581 | int hash; | |
582 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
583 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); | |
584 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); | |
585 | ||
586 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
587 | &old->h, | |
588 | hash); | |
589 | if (ch) | |
590 | return container_of(ch, struct svc_export, h); | |
591 | else | |
592 | return NULL; | |
593 | } | |
1da177e4 LT |
594 | |
595 | ||
596 | struct svc_expkey * | |
597 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) | |
598 | { | |
599 | struct svc_expkey key, *ek; | |
600 | int err; | |
601 | ||
602 | if (!clp) | |
603 | return NULL; | |
604 | ||
605 | key.ek_client = clp; | |
606 | key.ek_fsidtype = fsid_type; | |
607 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
608 | ||
8d270f7f | 609 | ek = svc_expkey_lookup(&key); |
1da177e4 LT |
610 | if (ek != NULL) |
611 | if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) | |
612 | ek = ERR_PTR(err); | |
613 | return ek; | |
614 | } | |
615 | ||
616 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
617 | struct svc_export *exp) | |
618 | { | |
619 | struct svc_expkey key, *ek; | |
620 | ||
621 | key.ek_client = clp; | |
622 | key.ek_fsidtype = fsid_type; | |
623 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
eab7e2e6 N |
624 | key.ek_mnt = exp->ex_mnt; |
625 | key.ek_dentry = exp->ex_dentry; | |
1da177e4 LT |
626 | key.h.expiry_time = NEVER; |
627 | key.h.flags = 0; | |
628 | ||
8d270f7f N |
629 | ek = svc_expkey_lookup(&key); |
630 | if (ek) | |
631 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 632 | if (ek) { |
baab935f | 633 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
634 | return 0; |
635 | } | |
636 | return -ENOMEM; | |
637 | } | |
638 | ||
639 | /* | |
640 | * Find the client's export entry matching xdev/xino. | |
641 | */ | |
642 | static inline struct svc_expkey * | |
643 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
644 | { | |
645 | u32 fsidv[3]; | |
646 | ||
647 | if (old_valid_dev(dev)) { | |
648 | mk_fsid_v0(fsidv, dev, ino); | |
649 | return exp_find_key(clp, 0, fsidv, NULL); | |
650 | } | |
651 | mk_fsid_v3(fsidv, dev, ino); | |
652 | return exp_find_key(clp, 3, fsidv, NULL); | |
653 | } | |
654 | ||
655 | /* | |
656 | * Find the client's export entry matching fsid | |
657 | */ | |
658 | static inline struct svc_expkey * | |
659 | exp_get_fsid_key(svc_client *clp, int fsid) | |
660 | { | |
661 | u32 fsidv[2]; | |
662 | ||
663 | mk_fsid_v1(fsidv, fsid); | |
664 | ||
665 | return exp_find_key(clp, 1, fsidv, NULL); | |
666 | } | |
667 | ||
668 | svc_export * | |
669 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
670 | struct cache_req *reqp) | |
671 | { | |
672 | struct svc_export *exp, key; | |
673 | ||
674 | if (!clp) | |
675 | return NULL; | |
676 | ||
677 | key.ex_client = clp; | |
678 | key.ex_mnt = mnt; | |
679 | key.ex_dentry = dentry; | |
680 | ||
4f7774c3 | 681 | exp = svc_export_lookup(&key); |
1da177e4 LT |
682 | if (exp != NULL) |
683 | switch (cache_check(&svc_export_cache, &exp->h, reqp)) { | |
684 | case 0: break; | |
685 | case -EAGAIN: | |
686 | exp = ERR_PTR(-EAGAIN); | |
687 | break; | |
688 | default: | |
689 | exp = NULL; | |
690 | } | |
691 | ||
692 | return exp; | |
693 | } | |
694 | ||
695 | /* | |
696 | * Find the export entry for a given dentry. | |
697 | */ | |
698 | struct svc_export * | |
699 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
700 | struct cache_req *reqp) | |
701 | { | |
702 | svc_export *exp; | |
703 | ||
704 | dget(dentry); | |
705 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
706 | ||
707 | while (exp == NULL && !IS_ROOT(dentry)) { | |
708 | struct dentry *parent; | |
709 | ||
710 | parent = dget_parent(dentry); | |
711 | dput(dentry); | |
712 | dentry = parent; | |
713 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
714 | } | |
715 | dput(dentry); | |
716 | return exp; | |
717 | } | |
718 | ||
719 | /* | |
720 | * Hashtable locking. Write locks are placed only by user processes | |
721 | * wanting to modify export information. | |
722 | * Write locking only done in this file. Read locking | |
723 | * needed externally. | |
724 | */ | |
725 | ||
726 | static DECLARE_RWSEM(hash_sem); | |
727 | ||
728 | void | |
729 | exp_readlock(void) | |
730 | { | |
731 | down_read(&hash_sem); | |
732 | } | |
733 | ||
734 | static inline void | |
735 | exp_writelock(void) | |
736 | { | |
737 | down_write(&hash_sem); | |
738 | } | |
739 | ||
740 | void | |
741 | exp_readunlock(void) | |
742 | { | |
743 | up_read(&hash_sem); | |
744 | } | |
745 | ||
746 | static inline void | |
747 | exp_writeunlock(void) | |
748 | { | |
749 | up_write(&hash_sem); | |
750 | } | |
751 | ||
752 | static void exp_fsid_unhash(struct svc_export *exp) | |
753 | { | |
754 | struct svc_expkey *ek; | |
755 | ||
756 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
757 | return; | |
758 | ||
759 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
760 | if (ek && !IS_ERR(ek)) { | |
761 | ek->h.expiry_time = get_seconds()-1; | |
baab935f | 762 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
763 | } |
764 | svc_expkey_cache.nextcheck = get_seconds(); | |
765 | } | |
766 | ||
767 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
768 | { | |
769 | u32 fsid[2]; | |
770 | ||
771 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
772 | return 0; | |
773 | ||
774 | mk_fsid_v1(fsid, exp->ex_fsid); | |
775 | return exp_set_key(clp, 1, fsid, exp); | |
776 | } | |
777 | ||
778 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
779 | { | |
780 | u32 fsid[2]; | |
781 | struct inode *inode = exp->ex_dentry->d_inode; | |
782 | dev_t dev = inode->i_sb->s_dev; | |
783 | ||
784 | if (old_valid_dev(dev)) { | |
785 | mk_fsid_v0(fsid, dev, inode->i_ino); | |
786 | return exp_set_key(clp, 0, fsid, exp); | |
787 | } | |
788 | mk_fsid_v3(fsid, dev, inode->i_ino); | |
789 | return exp_set_key(clp, 3, fsid, exp); | |
790 | } | |
791 | ||
792 | static void exp_unhash(struct svc_export *exp) | |
793 | { | |
794 | struct svc_expkey *ek; | |
795 | struct inode *inode = exp->ex_dentry->d_inode; | |
796 | ||
797 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
798 | if (ek && !IS_ERR(ek)) { | |
799 | ek->h.expiry_time = get_seconds()-1; | |
baab935f | 800 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
801 | } |
802 | svc_expkey_cache.nextcheck = get_seconds(); | |
803 | } | |
804 | ||
805 | /* | |
806 | * Export a file system. | |
807 | */ | |
808 | int | |
809 | exp_export(struct nfsctl_export *nxp) | |
810 | { | |
811 | svc_client *clp; | |
812 | struct svc_export *exp = NULL; | |
813 | struct svc_export new; | |
814 | struct svc_expkey *fsid_key = NULL; | |
815 | struct nameidata nd; | |
816 | int err; | |
817 | ||
818 | /* Consistency check */ | |
819 | err = -EINVAL; | |
820 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
821 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
822 | goto out; | |
823 | ||
824 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
825 | nxp->ex_client, nxp->ex_path, | |
826 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
827 | nxp->ex_flags); | |
828 | ||
829 | /* Try to lock the export table for update */ | |
830 | exp_writelock(); | |
831 | ||
832 | /* Look up client info */ | |
833 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
834 | goto out_unlock; | |
835 | ||
836 | ||
837 | /* Look up the dentry */ | |
838 | err = path_lookup(nxp->ex_path, 0, &nd); | |
839 | if (err) | |
840 | goto out_unlock; | |
841 | err = -EINVAL; | |
842 | ||
843 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); | |
844 | ||
845 | /* must make sure there won't be an ex_fsid clash */ | |
846 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
847 | (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && | |
848 | !IS_ERR(fsid_key) && | |
eab7e2e6 N |
849 | fsid_key->ek_mnt && |
850 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) | |
1da177e4 LT |
851 | goto finish; |
852 | ||
853 | if (exp) { | |
854 | /* just a flags/id/fsid update */ | |
855 | ||
856 | exp_fsid_unhash(exp); | |
857 | exp->ex_flags = nxp->ex_flags; | |
858 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
859 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
860 | exp->ex_fsid = nxp->ex_dev; | |
861 | ||
862 | err = exp_fsid_hash(clp, exp); | |
863 | goto finish; | |
864 | } | |
865 | ||
866 | err = check_export(nd.dentry->d_inode, nxp->ex_flags); | |
867 | if (err) goto finish; | |
868 | ||
869 | err = -ENOMEM; | |
870 | ||
871 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
872 | ||
873 | new.h.expiry_time = NEVER; | |
874 | new.h.flags = 0; | |
875 | new.ex_client = clp; | |
876 | new.ex_mnt = nd.mnt; | |
877 | new.ex_dentry = nd.dentry; | |
878 | new.ex_flags = nxp->ex_flags; | |
879 | new.ex_anon_uid = nxp->ex_anon_uid; | |
880 | new.ex_anon_gid = nxp->ex_anon_gid; | |
881 | new.ex_fsid = nxp->ex_dev; | |
882 | ||
4f7774c3 N |
883 | exp = svc_export_lookup(&new); |
884 | if (exp) | |
885 | exp = svc_export_update(&new, exp); | |
1da177e4 | 886 | |
4f7774c3 | 887 | if (!exp) |
1da177e4 LT |
888 | goto finish; |
889 | ||
1da177e4 LT |
890 | if (exp_hash(clp, exp) || |
891 | exp_fsid_hash(clp, exp)) { | |
892 | /* failed to create at least one index */ | |
893 | exp_do_unexport(exp); | |
894 | cache_flush(); | |
895 | err = -ENOMEM; | |
896 | } | |
897 | ||
898 | finish: | |
899 | if (exp) | |
900 | exp_put(exp); | |
901 | if (fsid_key && !IS_ERR(fsid_key)) | |
baab935f | 902 | cache_put(&fsid_key->h, &svc_expkey_cache); |
1da177e4 LT |
903 | if (clp) |
904 | auth_domain_put(clp); | |
905 | path_release(&nd); | |
906 | out_unlock: | |
907 | exp_writeunlock(); | |
908 | out: | |
909 | return err; | |
910 | } | |
911 | ||
912 | /* | |
913 | * Unexport a file system. The export entry has already | |
914 | * been removed from the client's list of exported fs's. | |
915 | */ | |
916 | static void | |
917 | exp_do_unexport(svc_export *unexp) | |
918 | { | |
919 | unexp->h.expiry_time = get_seconds()-1; | |
920 | svc_export_cache.nextcheck = get_seconds(); | |
921 | exp_unhash(unexp); | |
922 | exp_fsid_unhash(unexp); | |
923 | } | |
924 | ||
925 | ||
926 | /* | |
927 | * unexport syscall. | |
928 | */ | |
929 | int | |
930 | exp_unexport(struct nfsctl_export *nxp) | |
931 | { | |
932 | struct auth_domain *dom; | |
933 | svc_export *exp; | |
934 | struct nameidata nd; | |
935 | int err; | |
936 | ||
937 | /* Consistency check */ | |
938 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
939 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
940 | return -EINVAL; | |
941 | ||
942 | exp_writelock(); | |
943 | ||
944 | err = -EINVAL; | |
945 | dom = auth_domain_find(nxp->ex_client); | |
946 | if (!dom) { | |
947 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
948 | goto out_unlock; | |
949 | } | |
950 | ||
951 | err = path_lookup(nxp->ex_path, 0, &nd); | |
952 | if (err) | |
953 | goto out_domain; | |
954 | ||
955 | err = -EINVAL; | |
956 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); | |
957 | path_release(&nd); | |
958 | if (!exp) | |
959 | goto out_domain; | |
960 | ||
961 | exp_do_unexport(exp); | |
962 | exp_put(exp); | |
963 | err = 0; | |
964 | ||
965 | out_domain: | |
966 | auth_domain_put(dom); | |
967 | cache_flush(); | |
968 | out_unlock: | |
969 | exp_writeunlock(); | |
970 | return err; | |
971 | } | |
972 | ||
973 | /* | |
974 | * Obtain the root fh on behalf of a client. | |
975 | * This could be done in user space, but I feel that it adds some safety | |
976 | * since its harder to fool a kernel module than a user space program. | |
977 | */ | |
978 | int | |
979 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
980 | { | |
981 | struct svc_export *exp; | |
982 | struct nameidata nd; | |
983 | struct inode *inode; | |
984 | struct svc_fh fh; | |
985 | int err; | |
986 | ||
987 | err = -EPERM; | |
988 | /* NB: we probably ought to check that it's NUL-terminated */ | |
989 | if (path_lookup(path, 0, &nd)) { | |
990 | printk("nfsd: exp_rootfh path not found %s", path); | |
991 | return err; | |
992 | } | |
993 | inode = nd.dentry->d_inode; | |
994 | ||
995 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
996 | path, nd.dentry, clp->name, | |
997 | inode->i_sb->s_id, inode->i_ino); | |
998 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); | |
999 | if (!exp) { | |
1000 | dprintk("nfsd: exp_rootfh export not found.\n"); | |
1001 | goto out; | |
1002 | } | |
1003 | ||
1004 | /* | |
1005 | * fh must be initialized before calling fh_compose | |
1006 | */ | |
1007 | fh_init(&fh, maxsize); | |
1008 | if (fh_compose(&fh, exp, nd.dentry, NULL)) | |
1009 | err = -EINVAL; | |
1010 | else | |
1011 | err = 0; | |
1012 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1013 | fh_put(&fh); | |
1014 | exp_put(exp); | |
1015 | out: | |
1016 | path_release(&nd); | |
1017 | return err; | |
1018 | } | |
1019 | ||
eab7e2e6 N |
1020 | struct svc_export * |
1021 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, | |
1022 | struct cache_req *reqp) | |
1023 | { | |
1024 | struct svc_export *exp; | |
1025 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
1026 | if (!ek || IS_ERR(ek)) | |
1027 | return ERR_PTR(PTR_ERR(ek)); | |
1028 | ||
1029 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
baab935f | 1030 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 N |
1031 | |
1032 | if (!exp || IS_ERR(exp)) | |
1033 | return ERR_PTR(PTR_ERR(exp)); | |
1034 | return exp; | |
1035 | } | |
1036 | ||
1037 | ||
1da177e4 LT |
1038 | /* |
1039 | * Called when we need the filehandle for the root of the pseudofs, | |
1040 | * for a given NFSv4 client. The root is defined to be the | |
1041 | * export point with fsid==0 | |
1042 | */ | |
1043 | int | |
1044 | exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, | |
1045 | struct cache_req *creq) | |
1046 | { | |
1047 | struct svc_expkey *fsid_key; | |
eab7e2e6 | 1048 | struct svc_export *exp; |
1da177e4 LT |
1049 | int rv; |
1050 | u32 fsidv[2]; | |
1051 | ||
1052 | mk_fsid_v1(fsidv, 0); | |
1053 | ||
1054 | fsid_key = exp_find_key(clp, 1, fsidv, creq); | |
1055 | if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN) | |
1056 | return nfserr_dropit; | |
1057 | if (!fsid_key || IS_ERR(fsid_key)) | |
1058 | return nfserr_perm; | |
1059 | ||
eab7e2e6 N |
1060 | exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq); |
1061 | if (exp == NULL) | |
1062 | rv = nfserr_perm; | |
1063 | else if (IS_ERR(exp)) | |
1064 | rv = nfserrno(PTR_ERR(exp)); | |
1065 | else | |
1066 | rv = fh_compose(fhp, exp, | |
1067 | fsid_key->ek_dentry, NULL); | |
baab935f | 1068 | cache_put(&fsid_key->h, &svc_expkey_cache); |
1da177e4 LT |
1069 | return rv; |
1070 | } | |
1071 | ||
1072 | /* Iterator */ | |
1073 | ||
1074 | static void *e_start(struct seq_file *m, loff_t *pos) | |
1075 | { | |
1076 | loff_t n = *pos; | |
1077 | unsigned hash, export; | |
1078 | struct cache_head *ch; | |
1079 | ||
1080 | exp_readlock(); | |
1081 | read_lock(&svc_export_cache.hash_lock); | |
1082 | if (!n--) | |
1083 | return (void *)1; | |
1084 | hash = n >> 32; | |
1085 | export = n & ((1LL<<32) - 1); | |
1086 | ||
1087 | ||
1088 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1089 | if (!export--) | |
1090 | return ch; | |
1091 | n &= ~((1LL<<32) - 1); | |
1092 | do { | |
1093 | hash++; | |
1094 | n += 1LL<<32; | |
1095 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1096 | if (hash >= EXPORT_HASHMAX) | |
1097 | return NULL; | |
1098 | *pos = n+1; | |
1099 | return export_table[hash]; | |
1100 | } | |
1101 | ||
1102 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1103 | { | |
1104 | struct cache_head *ch = p; | |
1105 | int hash = (*pos >> 32); | |
1106 | ||
1107 | if (p == (void *)1) | |
1108 | hash = 0; | |
1109 | else if (ch->next == NULL) { | |
1110 | hash++; | |
1111 | *pos += 1LL<<32; | |
1112 | } else { | |
1113 | ++*pos; | |
1114 | return ch->next; | |
1115 | } | |
1116 | *pos &= ~((1LL<<32) - 1); | |
1117 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1118 | hash++; | |
1119 | *pos += 1LL<<32; | |
1120 | } | |
1121 | if (hash >= EXPORT_HASHMAX) | |
1122 | return NULL; | |
1123 | ++*pos; | |
1124 | return export_table[hash]; | |
1125 | } | |
1126 | ||
1127 | static void e_stop(struct seq_file *m, void *p) | |
1128 | { | |
1129 | read_unlock(&svc_export_cache.hash_lock); | |
1130 | exp_readunlock(); | |
1131 | } | |
1132 | ||
1133 | static struct flags { | |
1134 | int flag; | |
1135 | char *name[2]; | |
1136 | } expflags[] = { | |
1137 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1138 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1139 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1140 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1141 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1142 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1143 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1144 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1145 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1146 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1147 | #ifdef MSNFS | |
1148 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1149 | #endif | |
1150 | { 0, {"", ""}} | |
1151 | }; | |
1152 | ||
1153 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong) | |
1154 | { | |
1155 | int first = 0; | |
1156 | struct flags *flg; | |
1157 | ||
1158 | for (flg = expflags; flg->flag; flg++) { | |
1159 | int state = (flg->flag & flag)?0:1; | |
1160 | if (*flg->name[state]) | |
1161 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1162 | } | |
1163 | if (flag & NFSEXP_FSID) | |
1164 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); | |
1165 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) | |
1166 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); | |
1167 | if (anong != (gid_t)-2 && anong != (0x10000-2)) | |
1168 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); | |
1169 | } | |
1170 | ||
1171 | static int e_show(struct seq_file *m, void *p) | |
1172 | { | |
1173 | struct cache_head *cp = p; | |
1174 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1175 | svc_client *clp; | |
1176 | ||
1177 | if (p == (void *)1) { | |
1178 | seq_puts(m, "# Version 1.1\n"); | |
1179 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1180 | return 0; | |
1181 | } | |
1182 | ||
1183 | clp = exp->ex_client; | |
1184 | cache_get(&exp->h); | |
1185 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1186 | return 0; | |
baab935f | 1187 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
1188 | return svc_export_show(m, &svc_export_cache, cp); |
1189 | } | |
1190 | ||
1191 | struct seq_operations nfs_exports_op = { | |
1192 | .start = e_start, | |
1193 | .next = e_next, | |
1194 | .stop = e_stop, | |
1195 | .show = e_show, | |
1196 | }; | |
1197 | ||
1198 | /* | |
1199 | * Add or modify a client. | |
1200 | * Change requests may involve the list of host addresses. The list of | |
1201 | * exports and possibly existing uid maps are left untouched. | |
1202 | */ | |
1203 | int | |
1204 | exp_addclient(struct nfsctl_client *ncp) | |
1205 | { | |
1206 | struct auth_domain *dom; | |
1207 | int i, err; | |
1208 | ||
1209 | /* First, consistency check. */ | |
1210 | err = -EINVAL; | |
1211 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1212 | goto out; | |
1213 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1214 | goto out; | |
1215 | ||
1216 | /* Lock the hashtable */ | |
1217 | exp_writelock(); | |
1218 | ||
1219 | dom = unix_domain_find(ncp->cl_ident); | |
1220 | ||
1221 | err = -ENOMEM; | |
1222 | if (!dom) | |
1223 | goto out_unlock; | |
1224 | ||
1225 | /* Insert client into hashtable. */ | |
1226 | for (i = 0; i < ncp->cl_naddr; i++) | |
1227 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); | |
1228 | ||
1229 | auth_unix_forget_old(dom); | |
1230 | auth_domain_put(dom); | |
1231 | ||
1232 | err = 0; | |
1233 | ||
1234 | out_unlock: | |
1235 | exp_writeunlock(); | |
1236 | out: | |
1237 | return err; | |
1238 | } | |
1239 | ||
1240 | /* | |
1241 | * Delete a client given an identifier. | |
1242 | */ | |
1243 | int | |
1244 | exp_delclient(struct nfsctl_client *ncp) | |
1245 | { | |
1246 | int err; | |
1247 | struct auth_domain *dom; | |
1248 | ||
1249 | err = -EINVAL; | |
1250 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1251 | goto out; | |
1252 | ||
1253 | /* Lock the hashtable */ | |
1254 | exp_writelock(); | |
1255 | ||
1256 | dom = auth_domain_find(ncp->cl_ident); | |
1257 | /* just make sure that no addresses work | |
1258 | * and that it will expire soon | |
1259 | */ | |
1260 | if (dom) { | |
1261 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1262 | auth_domain_put(dom); |
1263 | } | |
1264 | ||
1265 | exp_writeunlock(); | |
1266 | out: | |
1267 | return err; | |
1268 | } | |
1269 | ||
1270 | /* | |
1271 | * Verify that string is non-empty and does not exceed max length. | |
1272 | */ | |
1273 | static int | |
1274 | exp_verify_string(char *cp, int max) | |
1275 | { | |
1276 | int i; | |
1277 | ||
1278 | for (i = 0; i < max; i++) | |
1279 | if (!cp[i]) | |
1280 | return i; | |
1281 | cp[i] = 0; | |
1282 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1283 | return 0; | |
1284 | } | |
1285 | ||
1286 | /* | |
1287 | * Initialize the exports module. | |
1288 | */ | |
1289 | void | |
1290 | nfsd_export_init(void) | |
1291 | { | |
1292 | dprintk("nfsd: initializing export module.\n"); | |
1293 | ||
1294 | cache_register(&svc_export_cache); | |
1295 | cache_register(&svc_expkey_cache); | |
1296 | ||
1297 | } | |
1298 | ||
1299 | /* | |
1300 | * Flush exports table - called when last nfsd thread is killed | |
1301 | */ | |
1302 | void | |
1303 | nfsd_export_flush(void) | |
1304 | { | |
1305 | exp_writelock(); | |
1306 | cache_purge(&svc_expkey_cache); | |
1307 | cache_purge(&svc_export_cache); | |
1308 | exp_writeunlock(); | |
1309 | } | |
1310 | ||
1311 | /* | |
1312 | * Shutdown the exports module. | |
1313 | */ | |
1314 | void | |
1315 | nfsd_export_shutdown(void) | |
1316 | { | |
1317 | ||
1318 | dprintk("nfsd: shutting down export module.\n"); | |
1319 | ||
1320 | exp_writelock(); | |
1321 | ||
1322 | if (cache_unregister(&svc_expkey_cache)) | |
1323 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); | |
1324 | if (cache_unregister(&svc_export_cache)) | |
1325 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); | |
1326 | svcauth_unix_purge(); | |
1327 | ||
1328 | exp_writeunlock(); | |
1329 | dprintk("nfsd: export shutdown complete.\n"); | |
1330 | } |