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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 | ||
60 | static inline int svc_expkey_hash(struct svc_expkey *item) | |
61 | { | |
62 | int hash = item->ek_fsidtype; | |
63 | char * cp = (char*)item->ek_fsid; | |
64 | int len = key_len(item->ek_fsidtype); | |
65 | ||
66 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
67 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
68 | return hash & EXPKEY_HASHMASK; | |
69 | } | |
70 | ||
71 | void expkey_put(struct cache_head *item, struct cache_detail *cd) | |
72 | { | |
73 | if (cache_put(item, cd)) { | |
74 | struct svc_expkey *key = container_of(item, struct svc_expkey, h); | |
75 | if (test_bit(CACHE_VALID, &item->flags) && | |
eab7e2e6 N |
76 | !test_bit(CACHE_NEGATIVE, &item->flags)) { |
77 | dput(key->ek_dentry); | |
78 | mntput(key->ek_mnt); | |
79 | } | |
1da177e4 LT |
80 | auth_domain_put(key->ek_client); |
81 | kfree(key); | |
82 | } | |
83 | } | |
84 | ||
85 | static void expkey_request(struct cache_detail *cd, | |
86 | struct cache_head *h, | |
87 | char **bpp, int *blen) | |
88 | { | |
89 | /* client fsidtype \xfsid */ | |
90 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
91 | char type[5]; | |
92 | ||
93 | qword_add(bpp, blen, ek->ek_client->name); | |
94 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
95 | qword_add(bpp, blen, type); | |
96 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
97 | (*bpp)[-1] = '\n'; | |
98 | } | |
99 | ||
100 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int); | |
101 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) | |
102 | { | |
103 | /* client fsidtype fsid [path] */ | |
104 | char *buf; | |
105 | int len; | |
106 | struct auth_domain *dom = NULL; | |
107 | int err; | |
108 | int fsidtype; | |
109 | char *ep; | |
110 | struct svc_expkey key; | |
111 | ||
112 | if (mesg[mlen-1] != '\n') | |
113 | return -EINVAL; | |
114 | mesg[mlen-1] = 0; | |
115 | ||
116 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
117 | err = -ENOMEM; | |
118 | if (!buf) goto out; | |
119 | ||
120 | err = -EINVAL; | |
121 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
122 | goto out; | |
123 | ||
124 | err = -ENOENT; | |
125 | dom = auth_domain_find(buf); | |
126 | if (!dom) | |
127 | goto out; | |
128 | dprintk("found domain %s\n", buf); | |
129 | ||
130 | err = -EINVAL; | |
131 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
132 | goto out; | |
133 | fsidtype = simple_strtoul(buf, &ep, 10); | |
134 | if (*ep) | |
135 | goto out; | |
136 | dprintk("found fsidtype %d\n", fsidtype); | |
137 | if (fsidtype > 2) | |
138 | goto out; | |
139 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
140 | goto out; | |
141 | dprintk("found fsid length %d\n", len); | |
142 | if (len != key_len(fsidtype)) | |
143 | goto out; | |
144 | ||
145 | /* OK, we seem to have a valid key */ | |
146 | key.h.flags = 0; | |
147 | key.h.expiry_time = get_expiry(&mesg); | |
148 | if (key.h.expiry_time == 0) | |
149 | goto out; | |
150 | ||
151 | key.ek_client = dom; | |
152 | key.ek_fsidtype = fsidtype; | |
153 | memcpy(key.ek_fsid, buf, len); | |
154 | ||
155 | /* now we want a pathname, or empty meaning NEGATIVE */ | |
156 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) | |
157 | goto out; | |
158 | dprintk("Path seems to be <%s>\n", buf); | |
159 | err = 0; | |
160 | if (len == 0) { | |
161 | struct svc_expkey *ek; | |
162 | set_bit(CACHE_NEGATIVE, &key.h.flags); | |
163 | ek = svc_expkey_lookup(&key, 1); | |
164 | if (ek) | |
165 | expkey_put(&ek->h, &svc_expkey_cache); | |
166 | } else { | |
167 | struct nameidata nd; | |
168 | struct svc_expkey *ek; | |
1da177e4 LT |
169 | err = path_lookup(buf, 0, &nd); |
170 | if (err) | |
171 | goto out; | |
172 | ||
173 | dprintk("Found the path %s\n", buf); | |
eab7e2e6 N |
174 | key.ek_mnt = nd.mnt; |
175 | key.ek_dentry = nd.dentry; | |
1da177e4 LT |
176 | |
177 | ek = svc_expkey_lookup(&key, 1); | |
178 | if (ek) | |
179 | expkey_put(&ek->h, &svc_expkey_cache); | |
1da177e4 | 180 | err = 0; |
1da177e4 LT |
181 | path_release(&nd); |
182 | } | |
183 | cache_flush(); | |
184 | out: | |
185 | if (dom) | |
186 | auth_domain_put(dom); | |
f99d49ad | 187 | kfree(buf); |
1da177e4 LT |
188 | return err; |
189 | } | |
190 | ||
191 | static int expkey_show(struct seq_file *m, | |
192 | struct cache_detail *cd, | |
193 | struct cache_head *h) | |
194 | { | |
195 | struct svc_expkey *ek ; | |
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); | |
202 | seq_printf(m, "%s %d 0x%08x", ek->ek_client->name, | |
203 | ek->ek_fsidtype, ek->ek_fsid[0]); | |
204 | if (ek->ek_fsidtype != 1) | |
205 | seq_printf(m, "%08x", ek->ek_fsid[1]); | |
206 | if (ek->ek_fsidtype == 2) | |
207 | seq_printf(m, "%08x", ek->ek_fsid[2]); | |
208 | if (test_bit(CACHE_VALID, &h->flags) && | |
209 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
210 | seq_printf(m, " "); | |
eab7e2e6 | 211 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
1da177e4 LT |
212 | } |
213 | seq_printf(m, "\n"); | |
214 | return 0; | |
215 | } | |
216 | ||
217 | struct cache_detail svc_expkey_cache = { | |
f35279d3 | 218 | .owner = THIS_MODULE, |
1da177e4 LT |
219 | .hash_size = EXPKEY_HASHMAX, |
220 | .hash_table = expkey_table, | |
221 | .name = "nfsd.fh", | |
222 | .cache_put = expkey_put, | |
223 | .cache_request = expkey_request, | |
224 | .cache_parse = expkey_parse, | |
225 | .cache_show = expkey_show, | |
226 | }; | |
227 | ||
228 | static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b) | |
229 | { | |
230 | if (a->ek_fsidtype != b->ek_fsidtype || | |
231 | a->ek_client != b->ek_client || | |
232 | memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0) | |
233 | return 0; | |
234 | return 1; | |
235 | } | |
236 | ||
237 | static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item) | |
238 | { | |
efc36aa5 | 239 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
240 | new->ek_client = item->ek_client; |
241 | new->ek_fsidtype = item->ek_fsidtype; | |
242 | new->ek_fsid[0] = item->ek_fsid[0]; | |
243 | new->ek_fsid[1] = item->ek_fsid[1]; | |
244 | new->ek_fsid[2] = item->ek_fsid[2]; | |
245 | } | |
246 | ||
247 | static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item) | |
248 | { | |
eab7e2e6 N |
249 | new->ek_mnt = mntget(item->ek_mnt); |
250 | new->ek_dentry = dget(item->ek_dentry); | |
1da177e4 LT |
251 | } |
252 | ||
7d317f2c | 253 | static DefineSimpleCacheLookup(svc_expkey, svc_expkey) |
1da177e4 LT |
254 | |
255 | #define EXPORT_HASHBITS 8 | |
256 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
257 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
258 | ||
259 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
260 | ||
261 | static inline int svc_export_hash(struct svc_export *item) | |
262 | { | |
263 | int rv; | |
264 | ||
265 | rv = hash_ptr(item->ex_client, EXPORT_HASHBITS); | |
266 | rv ^= hash_ptr(item->ex_dentry, EXPORT_HASHBITS); | |
267 | rv ^= hash_ptr(item->ex_mnt, EXPORT_HASHBITS); | |
268 | return rv; | |
269 | } | |
270 | ||
271 | void svc_export_put(struct cache_head *item, struct cache_detail *cd) | |
272 | { | |
273 | if (cache_put(item, cd)) { | |
274 | struct svc_export *exp = container_of(item, struct svc_export, h); | |
275 | dput(exp->ex_dentry); | |
276 | mntput(exp->ex_mnt); | |
277 | auth_domain_put(exp->ex_client); | |
278 | kfree(exp); | |
279 | } | |
280 | } | |
281 | ||
282 | static void svc_export_request(struct cache_detail *cd, | |
283 | struct cache_head *h, | |
284 | char **bpp, int *blen) | |
285 | { | |
286 | /* client path */ | |
287 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
288 | char *pth; | |
289 | ||
290 | qword_add(bpp, blen, exp->ex_client->name); | |
291 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
292 | if (IS_ERR(pth)) { | |
293 | /* is this correct? */ | |
294 | (*bpp)[0] = '\n'; | |
295 | return; | |
296 | } | |
297 | qword_add(bpp, blen, pth); | |
298 | (*bpp)[-1] = '\n'; | |
299 | } | |
300 | ||
301 | static struct svc_export *svc_export_lookup(struct svc_export *, int); | |
302 | ||
303 | static int check_export(struct inode *inode, int flags) | |
304 | { | |
305 | ||
306 | /* We currently export only dirs and regular files. | |
307 | * This is what umountd does. | |
308 | */ | |
309 | if (!S_ISDIR(inode->i_mode) && | |
310 | !S_ISREG(inode->i_mode)) | |
311 | return -ENOTDIR; | |
312 | ||
313 | /* There are two requirements on a filesystem to be exportable. | |
314 | * 1: We must be able to identify the filesystem from a number. | |
315 | * either a device number (so FS_REQUIRES_DEV needed) | |
316 | * or an FSID number (so NFSEXP_FSID needed). | |
317 | * 2: We must be able to find an inode from a filehandle. | |
318 | * This means that s_export_op must be set. | |
319 | */ | |
320 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
321 | !(flags & NFSEXP_FSID)) { | |
322 | dprintk("exp_export: export of non-dev fs without fsid"); | |
323 | return -EINVAL; | |
324 | } | |
325 | if (!inode->i_sb->s_export_op) { | |
326 | dprintk("exp_export: export of invalid fs type.\n"); | |
327 | return -EINVAL; | |
328 | } | |
329 | ||
330 | /* Ok, we can export it */; | |
331 | if (!inode->i_sb->s_export_op->find_exported_dentry) | |
332 | inode->i_sb->s_export_op->find_exported_dentry = | |
333 | find_exported_dentry; | |
334 | return 0; | |
335 | ||
336 | } | |
337 | ||
338 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) | |
339 | { | |
340 | /* client path expiry [flags anonuid anongid fsid] */ | |
341 | char *buf; | |
342 | int len; | |
343 | int err; | |
344 | struct auth_domain *dom = NULL; | |
345 | struct nameidata nd; | |
346 | struct svc_export exp, *expp; | |
347 | int an_int; | |
348 | ||
349 | nd.dentry = NULL; | |
350 | ||
351 | if (mesg[mlen-1] != '\n') | |
352 | return -EINVAL; | |
353 | mesg[mlen-1] = 0; | |
354 | ||
355 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
356 | err = -ENOMEM; | |
357 | if (!buf) goto out; | |
358 | ||
359 | /* client */ | |
360 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
361 | err = -EINVAL; | |
362 | if (len <= 0) goto out; | |
363 | ||
364 | err = -ENOENT; | |
365 | dom = auth_domain_find(buf); | |
366 | if (!dom) | |
367 | goto out; | |
368 | ||
369 | /* path */ | |
370 | err = -EINVAL; | |
371 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
372 | goto out; | |
373 | err = path_lookup(buf, 0, &nd); | |
374 | if (err) goto out; | |
375 | ||
376 | exp.h.flags = 0; | |
377 | exp.ex_client = dom; | |
378 | exp.ex_mnt = nd.mnt; | |
379 | exp.ex_dentry = nd.dentry; | |
380 | ||
381 | /* expiry */ | |
382 | err = -EINVAL; | |
383 | exp.h.expiry_time = get_expiry(&mesg); | |
384 | if (exp.h.expiry_time == 0) | |
385 | goto out; | |
386 | ||
387 | /* flags */ | |
388 | err = get_int(&mesg, &an_int); | |
389 | if (err == -ENOENT) | |
390 | set_bit(CACHE_NEGATIVE, &exp.h.flags); | |
391 | else { | |
392 | if (err || an_int < 0) goto out; | |
393 | exp.ex_flags= an_int; | |
394 | ||
395 | /* anon uid */ | |
396 | err = get_int(&mesg, &an_int); | |
397 | if (err) goto out; | |
398 | exp.ex_anon_uid= an_int; | |
399 | ||
400 | /* anon gid */ | |
401 | err = get_int(&mesg, &an_int); | |
402 | if (err) goto out; | |
403 | exp.ex_anon_gid= an_int; | |
404 | ||
405 | /* fsid */ | |
406 | err = get_int(&mesg, &an_int); | |
407 | if (err) goto out; | |
408 | exp.ex_fsid = an_int; | |
409 | ||
410 | err = check_export(nd.dentry->d_inode, exp.ex_flags); | |
411 | if (err) goto out; | |
412 | } | |
413 | ||
414 | expp = svc_export_lookup(&exp, 1); | |
415 | if (expp) | |
416 | exp_put(expp); | |
417 | err = 0; | |
418 | cache_flush(); | |
419 | out: | |
420 | if (nd.dentry) | |
421 | path_release(&nd); | |
422 | if (dom) | |
423 | auth_domain_put(dom); | |
f99d49ad | 424 | kfree(buf); |
1da177e4 LT |
425 | return err; |
426 | } | |
427 | ||
428 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong); | |
429 | ||
430 | static int svc_export_show(struct seq_file *m, | |
431 | struct cache_detail *cd, | |
432 | struct cache_head *h) | |
433 | { | |
434 | struct svc_export *exp ; | |
435 | ||
436 | if (h ==NULL) { | |
437 | seq_puts(m, "#path domain(flags)\n"); | |
438 | return 0; | |
439 | } | |
440 | exp = container_of(h, struct svc_export, h); | |
441 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
442 | seq_putc(m, '\t'); | |
443 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
444 | seq_putc(m, '('); | |
445 | if (test_bit(CACHE_VALID, &h->flags) && | |
446 | !test_bit(CACHE_NEGATIVE, &h->flags)) | |
447 | exp_flags(m, exp->ex_flags, exp->ex_fsid, | |
448 | exp->ex_anon_uid, exp->ex_anon_gid); | |
449 | seq_puts(m, ")\n"); | |
450 | return 0; | |
451 | } | |
452 | struct cache_detail svc_export_cache = { | |
f35279d3 | 453 | .owner = THIS_MODULE, |
1da177e4 LT |
454 | .hash_size = EXPORT_HASHMAX, |
455 | .hash_table = export_table, | |
456 | .name = "nfsd.export", | |
457 | .cache_put = svc_export_put, | |
458 | .cache_request = svc_export_request, | |
459 | .cache_parse = svc_export_parse, | |
460 | .cache_show = svc_export_show, | |
461 | }; | |
462 | ||
463 | static inline int svc_export_match(struct svc_export *a, struct svc_export *b) | |
464 | { | |
465 | return a->ex_client == b->ex_client && | |
466 | a->ex_dentry == b->ex_dentry && | |
467 | a->ex_mnt == b->ex_mnt; | |
468 | } | |
469 | static inline void svc_export_init(struct svc_export *new, struct svc_export *item) | |
470 | { | |
efc36aa5 | 471 | kref_get(&item->ex_client->ref); |
1da177e4 LT |
472 | new->ex_client = item->ex_client; |
473 | new->ex_dentry = dget(item->ex_dentry); | |
474 | new->ex_mnt = mntget(item->ex_mnt); | |
475 | } | |
476 | ||
477 | static inline void svc_export_update(struct svc_export *new, struct svc_export *item) | |
478 | { | |
479 | new->ex_flags = item->ex_flags; | |
480 | new->ex_anon_uid = item->ex_anon_uid; | |
481 | new->ex_anon_gid = item->ex_anon_gid; | |
482 | new->ex_fsid = item->ex_fsid; | |
483 | } | |
484 | ||
7d317f2c | 485 | static DefineSimpleCacheLookup(svc_export, svc_export) |
1da177e4 LT |
486 | |
487 | ||
488 | struct svc_expkey * | |
489 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) | |
490 | { | |
491 | struct svc_expkey key, *ek; | |
492 | int err; | |
493 | ||
494 | if (!clp) | |
495 | return NULL; | |
496 | ||
497 | key.ek_client = clp; | |
498 | key.ek_fsidtype = fsid_type; | |
499 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
500 | ||
501 | ek = svc_expkey_lookup(&key, 0); | |
502 | if (ek != NULL) | |
503 | if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) | |
504 | ek = ERR_PTR(err); | |
505 | return ek; | |
506 | } | |
507 | ||
508 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
509 | struct svc_export *exp) | |
510 | { | |
511 | struct svc_expkey key, *ek; | |
512 | ||
513 | key.ek_client = clp; | |
514 | key.ek_fsidtype = fsid_type; | |
515 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
eab7e2e6 N |
516 | key.ek_mnt = exp->ex_mnt; |
517 | key.ek_dentry = exp->ex_dentry; | |
1da177e4 LT |
518 | key.h.expiry_time = NEVER; |
519 | key.h.flags = 0; | |
520 | ||
521 | ek = svc_expkey_lookup(&key, 1); | |
522 | if (ek) { | |
523 | expkey_put(&ek->h, &svc_expkey_cache); | |
524 | return 0; | |
525 | } | |
526 | return -ENOMEM; | |
527 | } | |
528 | ||
529 | /* | |
530 | * Find the client's export entry matching xdev/xino. | |
531 | */ | |
532 | static inline struct svc_expkey * | |
533 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
534 | { | |
535 | u32 fsidv[3]; | |
536 | ||
537 | if (old_valid_dev(dev)) { | |
538 | mk_fsid_v0(fsidv, dev, ino); | |
539 | return exp_find_key(clp, 0, fsidv, NULL); | |
540 | } | |
541 | mk_fsid_v3(fsidv, dev, ino); | |
542 | return exp_find_key(clp, 3, fsidv, NULL); | |
543 | } | |
544 | ||
545 | /* | |
546 | * Find the client's export entry matching fsid | |
547 | */ | |
548 | static inline struct svc_expkey * | |
549 | exp_get_fsid_key(svc_client *clp, int fsid) | |
550 | { | |
551 | u32 fsidv[2]; | |
552 | ||
553 | mk_fsid_v1(fsidv, fsid); | |
554 | ||
555 | return exp_find_key(clp, 1, fsidv, NULL); | |
556 | } | |
557 | ||
558 | svc_export * | |
559 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
560 | struct cache_req *reqp) | |
561 | { | |
562 | struct svc_export *exp, key; | |
563 | ||
564 | if (!clp) | |
565 | return NULL; | |
566 | ||
567 | key.ex_client = clp; | |
568 | key.ex_mnt = mnt; | |
569 | key.ex_dentry = dentry; | |
570 | ||
571 | exp = svc_export_lookup(&key, 0); | |
572 | if (exp != NULL) | |
573 | switch (cache_check(&svc_export_cache, &exp->h, reqp)) { | |
574 | case 0: break; | |
575 | case -EAGAIN: | |
576 | exp = ERR_PTR(-EAGAIN); | |
577 | break; | |
578 | default: | |
579 | exp = NULL; | |
580 | } | |
581 | ||
582 | return exp; | |
583 | } | |
584 | ||
585 | /* | |
586 | * Find the export entry for a given dentry. | |
587 | */ | |
588 | struct svc_export * | |
589 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
590 | struct cache_req *reqp) | |
591 | { | |
592 | svc_export *exp; | |
593 | ||
594 | dget(dentry); | |
595 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
596 | ||
597 | while (exp == NULL && !IS_ROOT(dentry)) { | |
598 | struct dentry *parent; | |
599 | ||
600 | parent = dget_parent(dentry); | |
601 | dput(dentry); | |
602 | dentry = parent; | |
603 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
604 | } | |
605 | dput(dentry); | |
606 | return exp; | |
607 | } | |
608 | ||
609 | /* | |
610 | * Hashtable locking. Write locks are placed only by user processes | |
611 | * wanting to modify export information. | |
612 | * Write locking only done in this file. Read locking | |
613 | * needed externally. | |
614 | */ | |
615 | ||
616 | static DECLARE_RWSEM(hash_sem); | |
617 | ||
618 | void | |
619 | exp_readlock(void) | |
620 | { | |
621 | down_read(&hash_sem); | |
622 | } | |
623 | ||
624 | static inline void | |
625 | exp_writelock(void) | |
626 | { | |
627 | down_write(&hash_sem); | |
628 | } | |
629 | ||
630 | void | |
631 | exp_readunlock(void) | |
632 | { | |
633 | up_read(&hash_sem); | |
634 | } | |
635 | ||
636 | static inline void | |
637 | exp_writeunlock(void) | |
638 | { | |
639 | up_write(&hash_sem); | |
640 | } | |
641 | ||
642 | static void exp_fsid_unhash(struct svc_export *exp) | |
643 | { | |
644 | struct svc_expkey *ek; | |
645 | ||
646 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
647 | return; | |
648 | ||
649 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
650 | if (ek && !IS_ERR(ek)) { | |
651 | ek->h.expiry_time = get_seconds()-1; | |
652 | expkey_put(&ek->h, &svc_expkey_cache); | |
653 | } | |
654 | svc_expkey_cache.nextcheck = get_seconds(); | |
655 | } | |
656 | ||
657 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
658 | { | |
659 | u32 fsid[2]; | |
660 | ||
661 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
662 | return 0; | |
663 | ||
664 | mk_fsid_v1(fsid, exp->ex_fsid); | |
665 | return exp_set_key(clp, 1, fsid, exp); | |
666 | } | |
667 | ||
668 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
669 | { | |
670 | u32 fsid[2]; | |
671 | struct inode *inode = exp->ex_dentry->d_inode; | |
672 | dev_t dev = inode->i_sb->s_dev; | |
673 | ||
674 | if (old_valid_dev(dev)) { | |
675 | mk_fsid_v0(fsid, dev, inode->i_ino); | |
676 | return exp_set_key(clp, 0, fsid, exp); | |
677 | } | |
678 | mk_fsid_v3(fsid, dev, inode->i_ino); | |
679 | return exp_set_key(clp, 3, fsid, exp); | |
680 | } | |
681 | ||
682 | static void exp_unhash(struct svc_export *exp) | |
683 | { | |
684 | struct svc_expkey *ek; | |
685 | struct inode *inode = exp->ex_dentry->d_inode; | |
686 | ||
687 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
688 | if (ek && !IS_ERR(ek)) { | |
689 | ek->h.expiry_time = get_seconds()-1; | |
690 | expkey_put(&ek->h, &svc_expkey_cache); | |
691 | } | |
692 | svc_expkey_cache.nextcheck = get_seconds(); | |
693 | } | |
694 | ||
695 | /* | |
696 | * Export a file system. | |
697 | */ | |
698 | int | |
699 | exp_export(struct nfsctl_export *nxp) | |
700 | { | |
701 | svc_client *clp; | |
702 | struct svc_export *exp = NULL; | |
703 | struct svc_export new; | |
704 | struct svc_expkey *fsid_key = NULL; | |
705 | struct nameidata nd; | |
706 | int err; | |
707 | ||
708 | /* Consistency check */ | |
709 | err = -EINVAL; | |
710 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
711 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
712 | goto out; | |
713 | ||
714 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
715 | nxp->ex_client, nxp->ex_path, | |
716 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
717 | nxp->ex_flags); | |
718 | ||
719 | /* Try to lock the export table for update */ | |
720 | exp_writelock(); | |
721 | ||
722 | /* Look up client info */ | |
723 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
724 | goto out_unlock; | |
725 | ||
726 | ||
727 | /* Look up the dentry */ | |
728 | err = path_lookup(nxp->ex_path, 0, &nd); | |
729 | if (err) | |
730 | goto out_unlock; | |
731 | err = -EINVAL; | |
732 | ||
733 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); | |
734 | ||
735 | /* must make sure there won't be an ex_fsid clash */ | |
736 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
737 | (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && | |
738 | !IS_ERR(fsid_key) && | |
eab7e2e6 N |
739 | fsid_key->ek_mnt && |
740 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) | |
1da177e4 LT |
741 | goto finish; |
742 | ||
743 | if (exp) { | |
744 | /* just a flags/id/fsid update */ | |
745 | ||
746 | exp_fsid_unhash(exp); | |
747 | exp->ex_flags = nxp->ex_flags; | |
748 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
749 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
750 | exp->ex_fsid = nxp->ex_dev; | |
751 | ||
752 | err = exp_fsid_hash(clp, exp); | |
753 | goto finish; | |
754 | } | |
755 | ||
756 | err = check_export(nd.dentry->d_inode, nxp->ex_flags); | |
757 | if (err) goto finish; | |
758 | ||
759 | err = -ENOMEM; | |
760 | ||
761 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
762 | ||
763 | new.h.expiry_time = NEVER; | |
764 | new.h.flags = 0; | |
765 | new.ex_client = clp; | |
766 | new.ex_mnt = nd.mnt; | |
767 | new.ex_dentry = nd.dentry; | |
768 | new.ex_flags = nxp->ex_flags; | |
769 | new.ex_anon_uid = nxp->ex_anon_uid; | |
770 | new.ex_anon_gid = nxp->ex_anon_gid; | |
771 | new.ex_fsid = nxp->ex_dev; | |
772 | ||
773 | exp = svc_export_lookup(&new, 1); | |
774 | ||
775 | if (exp == NULL) | |
776 | goto finish; | |
777 | ||
778 | err = 0; | |
779 | ||
780 | if (exp_hash(clp, exp) || | |
781 | exp_fsid_hash(clp, exp)) { | |
782 | /* failed to create at least one index */ | |
783 | exp_do_unexport(exp); | |
784 | cache_flush(); | |
785 | err = -ENOMEM; | |
786 | } | |
787 | ||
788 | finish: | |
789 | if (exp) | |
790 | exp_put(exp); | |
791 | if (fsid_key && !IS_ERR(fsid_key)) | |
792 | expkey_put(&fsid_key->h, &svc_expkey_cache); | |
793 | if (clp) | |
794 | auth_domain_put(clp); | |
795 | path_release(&nd); | |
796 | out_unlock: | |
797 | exp_writeunlock(); | |
798 | out: | |
799 | return err; | |
800 | } | |
801 | ||
802 | /* | |
803 | * Unexport a file system. The export entry has already | |
804 | * been removed from the client's list of exported fs's. | |
805 | */ | |
806 | static void | |
807 | exp_do_unexport(svc_export *unexp) | |
808 | { | |
809 | unexp->h.expiry_time = get_seconds()-1; | |
810 | svc_export_cache.nextcheck = get_seconds(); | |
811 | exp_unhash(unexp); | |
812 | exp_fsid_unhash(unexp); | |
813 | } | |
814 | ||
815 | ||
816 | /* | |
817 | * unexport syscall. | |
818 | */ | |
819 | int | |
820 | exp_unexport(struct nfsctl_export *nxp) | |
821 | { | |
822 | struct auth_domain *dom; | |
823 | svc_export *exp; | |
824 | struct nameidata nd; | |
825 | int err; | |
826 | ||
827 | /* Consistency check */ | |
828 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
829 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
830 | return -EINVAL; | |
831 | ||
832 | exp_writelock(); | |
833 | ||
834 | err = -EINVAL; | |
835 | dom = auth_domain_find(nxp->ex_client); | |
836 | if (!dom) { | |
837 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
838 | goto out_unlock; | |
839 | } | |
840 | ||
841 | err = path_lookup(nxp->ex_path, 0, &nd); | |
842 | if (err) | |
843 | goto out_domain; | |
844 | ||
845 | err = -EINVAL; | |
846 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); | |
847 | path_release(&nd); | |
848 | if (!exp) | |
849 | goto out_domain; | |
850 | ||
851 | exp_do_unexport(exp); | |
852 | exp_put(exp); | |
853 | err = 0; | |
854 | ||
855 | out_domain: | |
856 | auth_domain_put(dom); | |
857 | cache_flush(); | |
858 | out_unlock: | |
859 | exp_writeunlock(); | |
860 | return err; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Obtain the root fh on behalf of a client. | |
865 | * This could be done in user space, but I feel that it adds some safety | |
866 | * since its harder to fool a kernel module than a user space program. | |
867 | */ | |
868 | int | |
869 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
870 | { | |
871 | struct svc_export *exp; | |
872 | struct nameidata nd; | |
873 | struct inode *inode; | |
874 | struct svc_fh fh; | |
875 | int err; | |
876 | ||
877 | err = -EPERM; | |
878 | /* NB: we probably ought to check that it's NUL-terminated */ | |
879 | if (path_lookup(path, 0, &nd)) { | |
880 | printk("nfsd: exp_rootfh path not found %s", path); | |
881 | return err; | |
882 | } | |
883 | inode = nd.dentry->d_inode; | |
884 | ||
885 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
886 | path, nd.dentry, clp->name, | |
887 | inode->i_sb->s_id, inode->i_ino); | |
888 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); | |
889 | if (!exp) { | |
890 | dprintk("nfsd: exp_rootfh export not found.\n"); | |
891 | goto out; | |
892 | } | |
893 | ||
894 | /* | |
895 | * fh must be initialized before calling fh_compose | |
896 | */ | |
897 | fh_init(&fh, maxsize); | |
898 | if (fh_compose(&fh, exp, nd.dentry, NULL)) | |
899 | err = -EINVAL; | |
900 | else | |
901 | err = 0; | |
902 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
903 | fh_put(&fh); | |
904 | exp_put(exp); | |
905 | out: | |
906 | path_release(&nd); | |
907 | return err; | |
908 | } | |
909 | ||
eab7e2e6 N |
910 | struct svc_export * |
911 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, | |
912 | struct cache_req *reqp) | |
913 | { | |
914 | struct svc_export *exp; | |
915 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
916 | if (!ek || IS_ERR(ek)) | |
917 | return ERR_PTR(PTR_ERR(ek)); | |
918 | ||
919 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
920 | expkey_put(&ek->h, &svc_expkey_cache); | |
921 | ||
922 | if (!exp || IS_ERR(exp)) | |
923 | return ERR_PTR(PTR_ERR(exp)); | |
924 | return exp; | |
925 | } | |
926 | ||
927 | ||
1da177e4 LT |
928 | /* |
929 | * Called when we need the filehandle for the root of the pseudofs, | |
930 | * for a given NFSv4 client. The root is defined to be the | |
931 | * export point with fsid==0 | |
932 | */ | |
933 | int | |
934 | exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, | |
935 | struct cache_req *creq) | |
936 | { | |
937 | struct svc_expkey *fsid_key; | |
eab7e2e6 | 938 | struct svc_export *exp; |
1da177e4 LT |
939 | int rv; |
940 | u32 fsidv[2]; | |
941 | ||
942 | mk_fsid_v1(fsidv, 0); | |
943 | ||
944 | fsid_key = exp_find_key(clp, 1, fsidv, creq); | |
945 | if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN) | |
946 | return nfserr_dropit; | |
947 | if (!fsid_key || IS_ERR(fsid_key)) | |
948 | return nfserr_perm; | |
949 | ||
eab7e2e6 N |
950 | exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq); |
951 | if (exp == NULL) | |
952 | rv = nfserr_perm; | |
953 | else if (IS_ERR(exp)) | |
954 | rv = nfserrno(PTR_ERR(exp)); | |
955 | else | |
956 | rv = fh_compose(fhp, exp, | |
957 | fsid_key->ek_dentry, NULL); | |
1da177e4 LT |
958 | expkey_put(&fsid_key->h, &svc_expkey_cache); |
959 | return rv; | |
960 | } | |
961 | ||
962 | /* Iterator */ | |
963 | ||
964 | static void *e_start(struct seq_file *m, loff_t *pos) | |
965 | { | |
966 | loff_t n = *pos; | |
967 | unsigned hash, export; | |
968 | struct cache_head *ch; | |
969 | ||
970 | exp_readlock(); | |
971 | read_lock(&svc_export_cache.hash_lock); | |
972 | if (!n--) | |
973 | return (void *)1; | |
974 | hash = n >> 32; | |
975 | export = n & ((1LL<<32) - 1); | |
976 | ||
977 | ||
978 | for (ch=export_table[hash]; ch; ch=ch->next) | |
979 | if (!export--) | |
980 | return ch; | |
981 | n &= ~((1LL<<32) - 1); | |
982 | do { | |
983 | hash++; | |
984 | n += 1LL<<32; | |
985 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
986 | if (hash >= EXPORT_HASHMAX) | |
987 | return NULL; | |
988 | *pos = n+1; | |
989 | return export_table[hash]; | |
990 | } | |
991 | ||
992 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
993 | { | |
994 | struct cache_head *ch = p; | |
995 | int hash = (*pos >> 32); | |
996 | ||
997 | if (p == (void *)1) | |
998 | hash = 0; | |
999 | else if (ch->next == NULL) { | |
1000 | hash++; | |
1001 | *pos += 1LL<<32; | |
1002 | } else { | |
1003 | ++*pos; | |
1004 | return ch->next; | |
1005 | } | |
1006 | *pos &= ~((1LL<<32) - 1); | |
1007 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1008 | hash++; | |
1009 | *pos += 1LL<<32; | |
1010 | } | |
1011 | if (hash >= EXPORT_HASHMAX) | |
1012 | return NULL; | |
1013 | ++*pos; | |
1014 | return export_table[hash]; | |
1015 | } | |
1016 | ||
1017 | static void e_stop(struct seq_file *m, void *p) | |
1018 | { | |
1019 | read_unlock(&svc_export_cache.hash_lock); | |
1020 | exp_readunlock(); | |
1021 | } | |
1022 | ||
1023 | static struct flags { | |
1024 | int flag; | |
1025 | char *name[2]; | |
1026 | } expflags[] = { | |
1027 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1028 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1029 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1030 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1031 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1032 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1033 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1034 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1035 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1036 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1037 | #ifdef MSNFS | |
1038 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1039 | #endif | |
1040 | { 0, {"", ""}} | |
1041 | }; | |
1042 | ||
1043 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong) | |
1044 | { | |
1045 | int first = 0; | |
1046 | struct flags *flg; | |
1047 | ||
1048 | for (flg = expflags; flg->flag; flg++) { | |
1049 | int state = (flg->flag & flag)?0:1; | |
1050 | if (*flg->name[state]) | |
1051 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1052 | } | |
1053 | if (flag & NFSEXP_FSID) | |
1054 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); | |
1055 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) | |
1056 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); | |
1057 | if (anong != (gid_t)-2 && anong != (0x10000-2)) | |
1058 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); | |
1059 | } | |
1060 | ||
1061 | static int e_show(struct seq_file *m, void *p) | |
1062 | { | |
1063 | struct cache_head *cp = p; | |
1064 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1065 | svc_client *clp; | |
1066 | ||
1067 | if (p == (void *)1) { | |
1068 | seq_puts(m, "# Version 1.1\n"); | |
1069 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1070 | return 0; | |
1071 | } | |
1072 | ||
1073 | clp = exp->ex_client; | |
1074 | cache_get(&exp->h); | |
1075 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1076 | return 0; | |
1077 | if (cache_put(&exp->h, &svc_export_cache)) BUG(); | |
1078 | return svc_export_show(m, &svc_export_cache, cp); | |
1079 | } | |
1080 | ||
1081 | struct seq_operations nfs_exports_op = { | |
1082 | .start = e_start, | |
1083 | .next = e_next, | |
1084 | .stop = e_stop, | |
1085 | .show = e_show, | |
1086 | }; | |
1087 | ||
1088 | /* | |
1089 | * Add or modify a client. | |
1090 | * Change requests may involve the list of host addresses. The list of | |
1091 | * exports and possibly existing uid maps are left untouched. | |
1092 | */ | |
1093 | int | |
1094 | exp_addclient(struct nfsctl_client *ncp) | |
1095 | { | |
1096 | struct auth_domain *dom; | |
1097 | int i, err; | |
1098 | ||
1099 | /* First, consistency check. */ | |
1100 | err = -EINVAL; | |
1101 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1102 | goto out; | |
1103 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1104 | goto out; | |
1105 | ||
1106 | /* Lock the hashtable */ | |
1107 | exp_writelock(); | |
1108 | ||
1109 | dom = unix_domain_find(ncp->cl_ident); | |
1110 | ||
1111 | err = -ENOMEM; | |
1112 | if (!dom) | |
1113 | goto out_unlock; | |
1114 | ||
1115 | /* Insert client into hashtable. */ | |
1116 | for (i = 0; i < ncp->cl_naddr; i++) | |
1117 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); | |
1118 | ||
1119 | auth_unix_forget_old(dom); | |
1120 | auth_domain_put(dom); | |
1121 | ||
1122 | err = 0; | |
1123 | ||
1124 | out_unlock: | |
1125 | exp_writeunlock(); | |
1126 | out: | |
1127 | return err; | |
1128 | } | |
1129 | ||
1130 | /* | |
1131 | * Delete a client given an identifier. | |
1132 | */ | |
1133 | int | |
1134 | exp_delclient(struct nfsctl_client *ncp) | |
1135 | { | |
1136 | int err; | |
1137 | struct auth_domain *dom; | |
1138 | ||
1139 | err = -EINVAL; | |
1140 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1141 | goto out; | |
1142 | ||
1143 | /* Lock the hashtable */ | |
1144 | exp_writelock(); | |
1145 | ||
1146 | dom = auth_domain_find(ncp->cl_ident); | |
1147 | /* just make sure that no addresses work | |
1148 | * and that it will expire soon | |
1149 | */ | |
1150 | if (dom) { | |
1151 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1152 | auth_domain_put(dom); |
1153 | } | |
1154 | ||
1155 | exp_writeunlock(); | |
1156 | out: | |
1157 | return err; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * Verify that string is non-empty and does not exceed max length. | |
1162 | */ | |
1163 | static int | |
1164 | exp_verify_string(char *cp, int max) | |
1165 | { | |
1166 | int i; | |
1167 | ||
1168 | for (i = 0; i < max; i++) | |
1169 | if (!cp[i]) | |
1170 | return i; | |
1171 | cp[i] = 0; | |
1172 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1173 | return 0; | |
1174 | } | |
1175 | ||
1176 | /* | |
1177 | * Initialize the exports module. | |
1178 | */ | |
1179 | void | |
1180 | nfsd_export_init(void) | |
1181 | { | |
1182 | dprintk("nfsd: initializing export module.\n"); | |
1183 | ||
1184 | cache_register(&svc_export_cache); | |
1185 | cache_register(&svc_expkey_cache); | |
1186 | ||
1187 | } | |
1188 | ||
1189 | /* | |
1190 | * Flush exports table - called when last nfsd thread is killed | |
1191 | */ | |
1192 | void | |
1193 | nfsd_export_flush(void) | |
1194 | { | |
1195 | exp_writelock(); | |
1196 | cache_purge(&svc_expkey_cache); | |
1197 | cache_purge(&svc_export_cache); | |
1198 | exp_writeunlock(); | |
1199 | } | |
1200 | ||
1201 | /* | |
1202 | * Shutdown the exports module. | |
1203 | */ | |
1204 | void | |
1205 | nfsd_export_shutdown(void) | |
1206 | { | |
1207 | ||
1208 | dprintk("nfsd: shutting down export module.\n"); | |
1209 | ||
1210 | exp_writelock(); | |
1211 | ||
1212 | if (cache_unregister(&svc_expkey_cache)) | |
1213 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); | |
1214 | if (cache_unregister(&svc_export_cache)) | |
1215 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); | |
1216 | svcauth_unix_purge(); | |
1217 | ||
1218 | exp_writeunlock(); | |
1219 | dprintk("nfsd: export shutdown complete.\n"); | |
1220 | } |