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 | ||
1da177e4 LT |
60 | void expkey_put(struct cache_head *item, struct cache_detail *cd) |
61 | { | |
62 | if (cache_put(item, cd)) { | |
63 | struct svc_expkey *key = container_of(item, struct svc_expkey, h); | |
64 | if (test_bit(CACHE_VALID, &item->flags) && | |
eab7e2e6 N |
65 | !test_bit(CACHE_NEGATIVE, &item->flags)) { |
66 | dput(key->ek_dentry); | |
67 | mntput(key->ek_mnt); | |
68 | } | |
1da177e4 LT |
69 | auth_domain_put(key->ek_client); |
70 | kfree(key); | |
71 | } | |
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 *); | |
1da177e4 LT |
91 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
92 | { | |
93 | /* client fsidtype fsid [path] */ | |
94 | char *buf; | |
95 | int len; | |
96 | struct auth_domain *dom = NULL; | |
97 | int err; | |
98 | int fsidtype; | |
99 | char *ep; | |
100 | struct svc_expkey key; | |
8d270f7f | 101 | struct svc_expkey *ek; |
1da177e4 LT |
102 | |
103 | if (mesg[mlen-1] != '\n') | |
104 | return -EINVAL; | |
105 | mesg[mlen-1] = 0; | |
106 | ||
107 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
108 | err = -ENOMEM; | |
109 | if (!buf) goto out; | |
110 | ||
111 | err = -EINVAL; | |
112 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
113 | goto out; | |
114 | ||
115 | err = -ENOENT; | |
116 | dom = auth_domain_find(buf); | |
117 | if (!dom) | |
118 | goto out; | |
119 | dprintk("found domain %s\n", buf); | |
120 | ||
121 | err = -EINVAL; | |
122 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
123 | goto out; | |
124 | fsidtype = simple_strtoul(buf, &ep, 10); | |
125 | if (*ep) | |
126 | goto out; | |
127 | dprintk("found fsidtype %d\n", fsidtype); | |
128 | if (fsidtype > 2) | |
129 | goto out; | |
130 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
131 | goto out; | |
132 | dprintk("found fsid length %d\n", len); | |
133 | if (len != key_len(fsidtype)) | |
134 | goto out; | |
135 | ||
136 | /* OK, we seem to have a valid key */ | |
137 | key.h.flags = 0; | |
138 | key.h.expiry_time = get_expiry(&mesg); | |
139 | if (key.h.expiry_time == 0) | |
140 | goto out; | |
141 | ||
142 | key.ek_client = dom; | |
143 | key.ek_fsidtype = fsidtype; | |
144 | memcpy(key.ek_fsid, buf, len); | |
145 | ||
8d270f7f N |
146 | ek = svc_expkey_lookup(&key); |
147 | err = -ENOMEM; | |
148 | if (!ek) | |
149 | goto out; | |
150 | ||
1da177e4 | 151 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 152 | err = -EINVAL; |
1da177e4 LT |
153 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
154 | goto out; | |
155 | dprintk("Path seems to be <%s>\n", buf); | |
156 | err = 0; | |
157 | if (len == 0) { | |
1da177e4 | 158 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
8d270f7f | 159 | ek = svc_expkey_update(&key, ek); |
1da177e4 LT |
160 | if (ek) |
161 | expkey_put(&ek->h, &svc_expkey_cache); | |
8d270f7f | 162 | else err = -ENOMEM; |
1da177e4 LT |
163 | } else { |
164 | struct nameidata nd; | |
1da177e4 LT |
165 | err = path_lookup(buf, 0, &nd); |
166 | if (err) | |
167 | goto out; | |
168 | ||
169 | dprintk("Found the path %s\n", buf); | |
eab7e2e6 N |
170 | key.ek_mnt = nd.mnt; |
171 | key.ek_dentry = nd.dentry; | |
1da177e4 | 172 | |
8d270f7f | 173 | ek = svc_expkey_update(&key, ek); |
1da177e4 LT |
174 | if (ek) |
175 | expkey_put(&ek->h, &svc_expkey_cache); | |
8d270f7f N |
176 | else |
177 | err = -ENOMEM; | |
1da177e4 LT |
178 | path_release(&nd); |
179 | } | |
180 | cache_flush(); | |
181 | out: | |
182 | if (dom) | |
183 | auth_domain_put(dom); | |
f99d49ad | 184 | kfree(buf); |
1da177e4 LT |
185 | return err; |
186 | } | |
187 | ||
188 | static int expkey_show(struct seq_file *m, | |
189 | struct cache_detail *cd, | |
190 | struct cache_head *h) | |
191 | { | |
192 | struct svc_expkey *ek ; | |
193 | ||
194 | if (h ==NULL) { | |
195 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
196 | return 0; | |
197 | } | |
198 | ek = container_of(h, struct svc_expkey, h); | |
199 | seq_printf(m, "%s %d 0x%08x", ek->ek_client->name, | |
200 | ek->ek_fsidtype, ek->ek_fsid[0]); | |
201 | if (ek->ek_fsidtype != 1) | |
202 | seq_printf(m, "%08x", ek->ek_fsid[1]); | |
203 | if (ek->ek_fsidtype == 2) | |
204 | seq_printf(m, "%08x", ek->ek_fsid[2]); | |
205 | if (test_bit(CACHE_VALID, &h->flags) && | |
206 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
207 | seq_printf(m, " "); | |
eab7e2e6 | 208 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
1da177e4 LT |
209 | } |
210 | seq_printf(m, "\n"); | |
211 | return 0; | |
212 | } | |
1da177e4 | 213 | |
8d270f7f | 214 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 215 | { |
8d270f7f N |
216 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
217 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
218 | ||
219 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
220 | orig->ek_client != new->ek_client || | |
221 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
222 | return 0; |
223 | return 1; | |
224 | } | |
225 | ||
8d270f7f N |
226 | static inline void expkey_init(struct cache_head *cnew, |
227 | struct cache_head *citem) | |
1da177e4 | 228 | { |
8d270f7f N |
229 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
230 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
231 | ||
efc36aa5 | 232 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
233 | new->ek_client = item->ek_client; |
234 | new->ek_fsidtype = item->ek_fsidtype; | |
235 | new->ek_fsid[0] = item->ek_fsid[0]; | |
236 | new->ek_fsid[1] = item->ek_fsid[1]; | |
237 | new->ek_fsid[2] = item->ek_fsid[2]; | |
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 | ||
259 | struct cache_detail svc_expkey_cache = { | |
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 | ||
1da177e4 LT |
321 | void svc_export_put(struct cache_head *item, struct cache_detail *cd) |
322 | { | |
323 | if (cache_put(item, cd)) { | |
324 | struct svc_export *exp = container_of(item, struct svc_export, h); | |
325 | dput(exp->ex_dentry); | |
326 | mntput(exp->ex_mnt); | |
327 | auth_domain_put(exp->ex_client); | |
328 | kfree(exp); | |
329 | } | |
330 | } | |
331 | ||
332 | static void svc_export_request(struct cache_detail *cd, | |
333 | struct cache_head *h, | |
334 | char **bpp, int *blen) | |
335 | { | |
336 | /* client path */ | |
337 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
338 | char *pth; | |
339 | ||
340 | qword_add(bpp, blen, exp->ex_client->name); | |
341 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
342 | if (IS_ERR(pth)) { | |
343 | /* is this correct? */ | |
344 | (*bpp)[0] = '\n'; | |
345 | return; | |
346 | } | |
347 | qword_add(bpp, blen, pth); | |
348 | (*bpp)[-1] = '\n'; | |
349 | } | |
350 | ||
4f7774c3 N |
351 | struct svc_export *svc_export_update(struct svc_export *new, struct svc_export *old); |
352 | static struct svc_export *svc_export_lookup(struct svc_export *); | |
1da177e4 LT |
353 | |
354 | static int check_export(struct inode *inode, int flags) | |
355 | { | |
356 | ||
357 | /* We currently export only dirs and regular files. | |
358 | * This is what umountd does. | |
359 | */ | |
360 | if (!S_ISDIR(inode->i_mode) && | |
361 | !S_ISREG(inode->i_mode)) | |
362 | return -ENOTDIR; | |
363 | ||
364 | /* There are two requirements on a filesystem to be exportable. | |
365 | * 1: We must be able to identify the filesystem from a number. | |
366 | * either a device number (so FS_REQUIRES_DEV needed) | |
367 | * or an FSID number (so NFSEXP_FSID needed). | |
368 | * 2: We must be able to find an inode from a filehandle. | |
369 | * This means that s_export_op must be set. | |
370 | */ | |
371 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
372 | !(flags & NFSEXP_FSID)) { | |
373 | dprintk("exp_export: export of non-dev fs without fsid"); | |
374 | return -EINVAL; | |
375 | } | |
376 | if (!inode->i_sb->s_export_op) { | |
377 | dprintk("exp_export: export of invalid fs type.\n"); | |
378 | return -EINVAL; | |
379 | } | |
380 | ||
381 | /* Ok, we can export it */; | |
382 | if (!inode->i_sb->s_export_op->find_exported_dentry) | |
383 | inode->i_sb->s_export_op->find_exported_dentry = | |
384 | find_exported_dentry; | |
385 | return 0; | |
386 | ||
387 | } | |
388 | ||
389 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) | |
390 | { | |
391 | /* client path expiry [flags anonuid anongid fsid] */ | |
392 | char *buf; | |
393 | int len; | |
394 | int err; | |
395 | struct auth_domain *dom = NULL; | |
396 | struct nameidata nd; | |
397 | struct svc_export exp, *expp; | |
398 | int an_int; | |
399 | ||
400 | nd.dentry = NULL; | |
401 | ||
402 | if (mesg[mlen-1] != '\n') | |
403 | return -EINVAL; | |
404 | mesg[mlen-1] = 0; | |
405 | ||
406 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
407 | err = -ENOMEM; | |
408 | if (!buf) goto out; | |
409 | ||
410 | /* client */ | |
411 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
412 | err = -EINVAL; | |
413 | if (len <= 0) goto out; | |
414 | ||
415 | err = -ENOENT; | |
416 | dom = auth_domain_find(buf); | |
417 | if (!dom) | |
418 | goto out; | |
419 | ||
420 | /* path */ | |
421 | err = -EINVAL; | |
422 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
423 | goto out; | |
424 | err = path_lookup(buf, 0, &nd); | |
425 | if (err) goto out; | |
426 | ||
427 | exp.h.flags = 0; | |
428 | exp.ex_client = dom; | |
429 | exp.ex_mnt = nd.mnt; | |
430 | exp.ex_dentry = nd.dentry; | |
431 | ||
432 | /* expiry */ | |
433 | err = -EINVAL; | |
434 | exp.h.expiry_time = get_expiry(&mesg); | |
435 | if (exp.h.expiry_time == 0) | |
436 | goto out; | |
437 | ||
438 | /* flags */ | |
439 | err = get_int(&mesg, &an_int); | |
440 | if (err == -ENOENT) | |
441 | set_bit(CACHE_NEGATIVE, &exp.h.flags); | |
442 | else { | |
443 | if (err || an_int < 0) goto out; | |
444 | exp.ex_flags= an_int; | |
445 | ||
446 | /* anon uid */ | |
447 | err = get_int(&mesg, &an_int); | |
448 | if (err) goto out; | |
449 | exp.ex_anon_uid= an_int; | |
450 | ||
451 | /* anon gid */ | |
452 | err = get_int(&mesg, &an_int); | |
453 | if (err) goto out; | |
454 | exp.ex_anon_gid= an_int; | |
455 | ||
456 | /* fsid */ | |
457 | err = get_int(&mesg, &an_int); | |
458 | if (err) goto out; | |
459 | exp.ex_fsid = an_int; | |
460 | ||
461 | err = check_export(nd.dentry->d_inode, exp.ex_flags); | |
462 | if (err) goto out; | |
463 | } | |
464 | ||
4f7774c3 | 465 | expp = svc_export_lookup(&exp); |
1da177e4 | 466 | if (expp) |
4f7774c3 N |
467 | expp = svc_export_update(&exp, expp); |
468 | else | |
469 | err = -ENOMEM; | |
1da177e4 | 470 | cache_flush(); |
4f7774c3 N |
471 | if (expp == NULL) |
472 | err = -ENOMEM; | |
473 | else | |
474 | exp_put(expp); | |
1da177e4 LT |
475 | out: |
476 | if (nd.dentry) | |
477 | path_release(&nd); | |
478 | if (dom) | |
479 | auth_domain_put(dom); | |
f99d49ad | 480 | kfree(buf); |
1da177e4 LT |
481 | return err; |
482 | } | |
483 | ||
484 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong); | |
485 | ||
486 | static int svc_export_show(struct seq_file *m, | |
487 | struct cache_detail *cd, | |
488 | struct cache_head *h) | |
489 | { | |
490 | struct svc_export *exp ; | |
491 | ||
492 | if (h ==NULL) { | |
493 | seq_puts(m, "#path domain(flags)\n"); | |
494 | return 0; | |
495 | } | |
496 | exp = container_of(h, struct svc_export, h); | |
497 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
498 | seq_putc(m, '\t'); | |
499 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
500 | seq_putc(m, '('); | |
501 | if (test_bit(CACHE_VALID, &h->flags) && | |
502 | !test_bit(CACHE_NEGATIVE, &h->flags)) | |
503 | exp_flags(m, exp->ex_flags, exp->ex_fsid, | |
504 | exp->ex_anon_uid, exp->ex_anon_gid); | |
505 | seq_puts(m, ")\n"); | |
506 | return 0; | |
507 | } | |
4f7774c3 | 508 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 509 | { |
4f7774c3 N |
510 | struct svc_export *orig = container_of(a, struct svc_export, h); |
511 | struct svc_export *new = container_of(b, struct svc_export, h); | |
512 | return orig->ex_client == new->ex_client && | |
513 | orig->ex_dentry == new->ex_dentry && | |
514 | orig->ex_mnt == new->ex_mnt; | |
1da177e4 | 515 | } |
4f7774c3 N |
516 | |
517 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 518 | { |
4f7774c3 N |
519 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
520 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
521 | ||
efc36aa5 | 522 | kref_get(&item->ex_client->ref); |
1da177e4 LT |
523 | new->ex_client = item->ex_client; |
524 | new->ex_dentry = dget(item->ex_dentry); | |
525 | new->ex_mnt = mntget(item->ex_mnt); | |
526 | } | |
527 | ||
4f7774c3 | 528 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 529 | { |
4f7774c3 N |
530 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
531 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
532 | ||
1da177e4 LT |
533 | new->ex_flags = item->ex_flags; |
534 | new->ex_anon_uid = item->ex_anon_uid; | |
535 | new->ex_anon_gid = item->ex_anon_gid; | |
536 | new->ex_fsid = item->ex_fsid; | |
537 | } | |
538 | ||
4f7774c3 N |
539 | static struct cache_head *svc_export_alloc(void) |
540 | { | |
541 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
542 | if (i) | |
543 | return &i->h; | |
544 | else | |
545 | return NULL; | |
546 | } | |
547 | ||
548 | struct cache_detail svc_export_cache = { | |
549 | .owner = THIS_MODULE, | |
550 | .hash_size = EXPORT_HASHMAX, | |
551 | .hash_table = export_table, | |
552 | .name = "nfsd.export", | |
553 | .cache_put = svc_export_put, | |
554 | .cache_request = svc_export_request, | |
555 | .cache_parse = svc_export_parse, | |
556 | .cache_show = svc_export_show, | |
557 | .match = svc_export_match, | |
558 | .init = svc_export_init, | |
559 | .update = export_update, | |
560 | .alloc = svc_export_alloc, | |
561 | }; | |
562 | ||
563 | static struct svc_export * | |
564 | svc_export_lookup(struct svc_export *exp) | |
565 | { | |
566 | struct cache_head *ch; | |
567 | int hash; | |
568 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
569 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); | |
570 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); | |
571 | ||
572 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
573 | hash); | |
574 | if (ch) | |
575 | return container_of(ch, struct svc_export, h); | |
576 | else | |
577 | return NULL; | |
578 | } | |
579 | ||
580 | struct svc_export * | |
581 | svc_export_update(struct svc_export *new, struct svc_export *old) | |
582 | { | |
583 | struct cache_head *ch; | |
584 | int hash; | |
585 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
586 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); | |
587 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); | |
588 | ||
589 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
590 | &old->h, | |
591 | hash); | |
592 | if (ch) | |
593 | return container_of(ch, struct svc_export, h); | |
594 | else | |
595 | return NULL; | |
596 | } | |
1da177e4 LT |
597 | |
598 | ||
599 | struct svc_expkey * | |
600 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) | |
601 | { | |
602 | struct svc_expkey key, *ek; | |
603 | int err; | |
604 | ||
605 | if (!clp) | |
606 | return NULL; | |
607 | ||
608 | key.ek_client = clp; | |
609 | key.ek_fsidtype = fsid_type; | |
610 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
611 | ||
8d270f7f | 612 | ek = svc_expkey_lookup(&key); |
1da177e4 LT |
613 | if (ek != NULL) |
614 | if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) | |
615 | ek = ERR_PTR(err); | |
616 | return ek; | |
617 | } | |
618 | ||
619 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
620 | struct svc_export *exp) | |
621 | { | |
622 | struct svc_expkey key, *ek; | |
623 | ||
624 | key.ek_client = clp; | |
625 | key.ek_fsidtype = fsid_type; | |
626 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
eab7e2e6 N |
627 | key.ek_mnt = exp->ex_mnt; |
628 | key.ek_dentry = exp->ex_dentry; | |
1da177e4 LT |
629 | key.h.expiry_time = NEVER; |
630 | key.h.flags = 0; | |
631 | ||
8d270f7f N |
632 | ek = svc_expkey_lookup(&key); |
633 | if (ek) | |
634 | ek = svc_expkey_update(&key,ek); | |
1da177e4 LT |
635 | if (ek) { |
636 | expkey_put(&ek->h, &svc_expkey_cache); | |
637 | return 0; | |
638 | } | |
639 | return -ENOMEM; | |
640 | } | |
641 | ||
642 | /* | |
643 | * Find the client's export entry matching xdev/xino. | |
644 | */ | |
645 | static inline struct svc_expkey * | |
646 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
647 | { | |
648 | u32 fsidv[3]; | |
649 | ||
650 | if (old_valid_dev(dev)) { | |
651 | mk_fsid_v0(fsidv, dev, ino); | |
652 | return exp_find_key(clp, 0, fsidv, NULL); | |
653 | } | |
654 | mk_fsid_v3(fsidv, dev, ino); | |
655 | return exp_find_key(clp, 3, fsidv, NULL); | |
656 | } | |
657 | ||
658 | /* | |
659 | * Find the client's export entry matching fsid | |
660 | */ | |
661 | static inline struct svc_expkey * | |
662 | exp_get_fsid_key(svc_client *clp, int fsid) | |
663 | { | |
664 | u32 fsidv[2]; | |
665 | ||
666 | mk_fsid_v1(fsidv, fsid); | |
667 | ||
668 | return exp_find_key(clp, 1, fsidv, NULL); | |
669 | } | |
670 | ||
671 | svc_export * | |
672 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
673 | struct cache_req *reqp) | |
674 | { | |
675 | struct svc_export *exp, key; | |
676 | ||
677 | if (!clp) | |
678 | return NULL; | |
679 | ||
680 | key.ex_client = clp; | |
681 | key.ex_mnt = mnt; | |
682 | key.ex_dentry = dentry; | |
683 | ||
4f7774c3 | 684 | exp = svc_export_lookup(&key); |
1da177e4 LT |
685 | if (exp != NULL) |
686 | switch (cache_check(&svc_export_cache, &exp->h, reqp)) { | |
687 | case 0: break; | |
688 | case -EAGAIN: | |
689 | exp = ERR_PTR(-EAGAIN); | |
690 | break; | |
691 | default: | |
692 | exp = NULL; | |
693 | } | |
694 | ||
695 | return exp; | |
696 | } | |
697 | ||
698 | /* | |
699 | * Find the export entry for a given dentry. | |
700 | */ | |
701 | struct svc_export * | |
702 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
703 | struct cache_req *reqp) | |
704 | { | |
705 | svc_export *exp; | |
706 | ||
707 | dget(dentry); | |
708 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
709 | ||
710 | while (exp == NULL && !IS_ROOT(dentry)) { | |
711 | struct dentry *parent; | |
712 | ||
713 | parent = dget_parent(dentry); | |
714 | dput(dentry); | |
715 | dentry = parent; | |
716 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
717 | } | |
718 | dput(dentry); | |
719 | return exp; | |
720 | } | |
721 | ||
722 | /* | |
723 | * Hashtable locking. Write locks are placed only by user processes | |
724 | * wanting to modify export information. | |
725 | * Write locking only done in this file. Read locking | |
726 | * needed externally. | |
727 | */ | |
728 | ||
729 | static DECLARE_RWSEM(hash_sem); | |
730 | ||
731 | void | |
732 | exp_readlock(void) | |
733 | { | |
734 | down_read(&hash_sem); | |
735 | } | |
736 | ||
737 | static inline void | |
738 | exp_writelock(void) | |
739 | { | |
740 | down_write(&hash_sem); | |
741 | } | |
742 | ||
743 | void | |
744 | exp_readunlock(void) | |
745 | { | |
746 | up_read(&hash_sem); | |
747 | } | |
748 | ||
749 | static inline void | |
750 | exp_writeunlock(void) | |
751 | { | |
752 | up_write(&hash_sem); | |
753 | } | |
754 | ||
755 | static void exp_fsid_unhash(struct svc_export *exp) | |
756 | { | |
757 | struct svc_expkey *ek; | |
758 | ||
759 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
760 | return; | |
761 | ||
762 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
763 | if (ek && !IS_ERR(ek)) { | |
764 | ek->h.expiry_time = get_seconds()-1; | |
765 | expkey_put(&ek->h, &svc_expkey_cache); | |
766 | } | |
767 | svc_expkey_cache.nextcheck = get_seconds(); | |
768 | } | |
769 | ||
770 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
771 | { | |
772 | u32 fsid[2]; | |
773 | ||
774 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
775 | return 0; | |
776 | ||
777 | mk_fsid_v1(fsid, exp->ex_fsid); | |
778 | return exp_set_key(clp, 1, fsid, exp); | |
779 | } | |
780 | ||
781 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
782 | { | |
783 | u32 fsid[2]; | |
784 | struct inode *inode = exp->ex_dentry->d_inode; | |
785 | dev_t dev = inode->i_sb->s_dev; | |
786 | ||
787 | if (old_valid_dev(dev)) { | |
788 | mk_fsid_v0(fsid, dev, inode->i_ino); | |
789 | return exp_set_key(clp, 0, fsid, exp); | |
790 | } | |
791 | mk_fsid_v3(fsid, dev, inode->i_ino); | |
792 | return exp_set_key(clp, 3, fsid, exp); | |
793 | } | |
794 | ||
795 | static void exp_unhash(struct svc_export *exp) | |
796 | { | |
797 | struct svc_expkey *ek; | |
798 | struct inode *inode = exp->ex_dentry->d_inode; | |
799 | ||
800 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
801 | if (ek && !IS_ERR(ek)) { | |
802 | ek->h.expiry_time = get_seconds()-1; | |
803 | expkey_put(&ek->h, &svc_expkey_cache); | |
804 | } | |
805 | svc_expkey_cache.nextcheck = get_seconds(); | |
806 | } | |
807 | ||
808 | /* | |
809 | * Export a file system. | |
810 | */ | |
811 | int | |
812 | exp_export(struct nfsctl_export *nxp) | |
813 | { | |
814 | svc_client *clp; | |
815 | struct svc_export *exp = NULL; | |
816 | struct svc_export new; | |
817 | struct svc_expkey *fsid_key = NULL; | |
818 | struct nameidata nd; | |
819 | int err; | |
820 | ||
821 | /* Consistency check */ | |
822 | err = -EINVAL; | |
823 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
824 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
825 | goto out; | |
826 | ||
827 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
828 | nxp->ex_client, nxp->ex_path, | |
829 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
830 | nxp->ex_flags); | |
831 | ||
832 | /* Try to lock the export table for update */ | |
833 | exp_writelock(); | |
834 | ||
835 | /* Look up client info */ | |
836 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
837 | goto out_unlock; | |
838 | ||
839 | ||
840 | /* Look up the dentry */ | |
841 | err = path_lookup(nxp->ex_path, 0, &nd); | |
842 | if (err) | |
843 | goto out_unlock; | |
844 | err = -EINVAL; | |
845 | ||
846 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); | |
847 | ||
848 | /* must make sure there won't be an ex_fsid clash */ | |
849 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
850 | (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && | |
851 | !IS_ERR(fsid_key) && | |
eab7e2e6 N |
852 | fsid_key->ek_mnt && |
853 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) | |
1da177e4 LT |
854 | goto finish; |
855 | ||
856 | if (exp) { | |
857 | /* just a flags/id/fsid update */ | |
858 | ||
859 | exp_fsid_unhash(exp); | |
860 | exp->ex_flags = nxp->ex_flags; | |
861 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
862 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
863 | exp->ex_fsid = nxp->ex_dev; | |
864 | ||
865 | err = exp_fsid_hash(clp, exp); | |
866 | goto finish; | |
867 | } | |
868 | ||
869 | err = check_export(nd.dentry->d_inode, nxp->ex_flags); | |
870 | if (err) goto finish; | |
871 | ||
872 | err = -ENOMEM; | |
873 | ||
874 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
875 | ||
876 | new.h.expiry_time = NEVER; | |
877 | new.h.flags = 0; | |
878 | new.ex_client = clp; | |
879 | new.ex_mnt = nd.mnt; | |
880 | new.ex_dentry = nd.dentry; | |
881 | new.ex_flags = nxp->ex_flags; | |
882 | new.ex_anon_uid = nxp->ex_anon_uid; | |
883 | new.ex_anon_gid = nxp->ex_anon_gid; | |
884 | new.ex_fsid = nxp->ex_dev; | |
885 | ||
4f7774c3 N |
886 | exp = svc_export_lookup(&new); |
887 | if (exp) | |
888 | exp = svc_export_update(&new, exp); | |
1da177e4 | 889 | |
4f7774c3 | 890 | if (!exp) |
1da177e4 LT |
891 | goto finish; |
892 | ||
1da177e4 LT |
893 | if (exp_hash(clp, exp) || |
894 | exp_fsid_hash(clp, exp)) { | |
895 | /* failed to create at least one index */ | |
896 | exp_do_unexport(exp); | |
897 | cache_flush(); | |
898 | err = -ENOMEM; | |
899 | } | |
900 | ||
901 | finish: | |
902 | if (exp) | |
903 | exp_put(exp); | |
904 | if (fsid_key && !IS_ERR(fsid_key)) | |
905 | expkey_put(&fsid_key->h, &svc_expkey_cache); | |
906 | if (clp) | |
907 | auth_domain_put(clp); | |
908 | path_release(&nd); | |
909 | out_unlock: | |
910 | exp_writeunlock(); | |
911 | out: | |
912 | return err; | |
913 | } | |
914 | ||
915 | /* | |
916 | * Unexport a file system. The export entry has already | |
917 | * been removed from the client's list of exported fs's. | |
918 | */ | |
919 | static void | |
920 | exp_do_unexport(svc_export *unexp) | |
921 | { | |
922 | unexp->h.expiry_time = get_seconds()-1; | |
923 | svc_export_cache.nextcheck = get_seconds(); | |
924 | exp_unhash(unexp); | |
925 | exp_fsid_unhash(unexp); | |
926 | } | |
927 | ||
928 | ||
929 | /* | |
930 | * unexport syscall. | |
931 | */ | |
932 | int | |
933 | exp_unexport(struct nfsctl_export *nxp) | |
934 | { | |
935 | struct auth_domain *dom; | |
936 | svc_export *exp; | |
937 | struct nameidata nd; | |
938 | int err; | |
939 | ||
940 | /* Consistency check */ | |
941 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
942 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
943 | return -EINVAL; | |
944 | ||
945 | exp_writelock(); | |
946 | ||
947 | err = -EINVAL; | |
948 | dom = auth_domain_find(nxp->ex_client); | |
949 | if (!dom) { | |
950 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
951 | goto out_unlock; | |
952 | } | |
953 | ||
954 | err = path_lookup(nxp->ex_path, 0, &nd); | |
955 | if (err) | |
956 | goto out_domain; | |
957 | ||
958 | err = -EINVAL; | |
959 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); | |
960 | path_release(&nd); | |
961 | if (!exp) | |
962 | goto out_domain; | |
963 | ||
964 | exp_do_unexport(exp); | |
965 | exp_put(exp); | |
966 | err = 0; | |
967 | ||
968 | out_domain: | |
969 | auth_domain_put(dom); | |
970 | cache_flush(); | |
971 | out_unlock: | |
972 | exp_writeunlock(); | |
973 | return err; | |
974 | } | |
975 | ||
976 | /* | |
977 | * Obtain the root fh on behalf of a client. | |
978 | * This could be done in user space, but I feel that it adds some safety | |
979 | * since its harder to fool a kernel module than a user space program. | |
980 | */ | |
981 | int | |
982 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
983 | { | |
984 | struct svc_export *exp; | |
985 | struct nameidata nd; | |
986 | struct inode *inode; | |
987 | struct svc_fh fh; | |
988 | int err; | |
989 | ||
990 | err = -EPERM; | |
991 | /* NB: we probably ought to check that it's NUL-terminated */ | |
992 | if (path_lookup(path, 0, &nd)) { | |
993 | printk("nfsd: exp_rootfh path not found %s", path); | |
994 | return err; | |
995 | } | |
996 | inode = nd.dentry->d_inode; | |
997 | ||
998 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
999 | path, nd.dentry, clp->name, | |
1000 | inode->i_sb->s_id, inode->i_ino); | |
1001 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); | |
1002 | if (!exp) { | |
1003 | dprintk("nfsd: exp_rootfh export not found.\n"); | |
1004 | goto out; | |
1005 | } | |
1006 | ||
1007 | /* | |
1008 | * fh must be initialized before calling fh_compose | |
1009 | */ | |
1010 | fh_init(&fh, maxsize); | |
1011 | if (fh_compose(&fh, exp, nd.dentry, NULL)) | |
1012 | err = -EINVAL; | |
1013 | else | |
1014 | err = 0; | |
1015 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1016 | fh_put(&fh); | |
1017 | exp_put(exp); | |
1018 | out: | |
1019 | path_release(&nd); | |
1020 | return err; | |
1021 | } | |
1022 | ||
eab7e2e6 N |
1023 | struct svc_export * |
1024 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, | |
1025 | struct cache_req *reqp) | |
1026 | { | |
1027 | struct svc_export *exp; | |
1028 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
1029 | if (!ek || IS_ERR(ek)) | |
1030 | return ERR_PTR(PTR_ERR(ek)); | |
1031 | ||
1032 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
1033 | expkey_put(&ek->h, &svc_expkey_cache); | |
1034 | ||
1035 | if (!exp || IS_ERR(exp)) | |
1036 | return ERR_PTR(PTR_ERR(exp)); | |
1037 | return exp; | |
1038 | } | |
1039 | ||
1040 | ||
1da177e4 LT |
1041 | /* |
1042 | * Called when we need the filehandle for the root of the pseudofs, | |
1043 | * for a given NFSv4 client. The root is defined to be the | |
1044 | * export point with fsid==0 | |
1045 | */ | |
1046 | int | |
1047 | exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, | |
1048 | struct cache_req *creq) | |
1049 | { | |
1050 | struct svc_expkey *fsid_key; | |
eab7e2e6 | 1051 | struct svc_export *exp; |
1da177e4 LT |
1052 | int rv; |
1053 | u32 fsidv[2]; | |
1054 | ||
1055 | mk_fsid_v1(fsidv, 0); | |
1056 | ||
1057 | fsid_key = exp_find_key(clp, 1, fsidv, creq); | |
1058 | if (IS_ERR(fsid_key) && PTR_ERR(fsid_key) == -EAGAIN) | |
1059 | return nfserr_dropit; | |
1060 | if (!fsid_key || IS_ERR(fsid_key)) | |
1061 | return nfserr_perm; | |
1062 | ||
eab7e2e6 N |
1063 | exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq); |
1064 | if (exp == NULL) | |
1065 | rv = nfserr_perm; | |
1066 | else if (IS_ERR(exp)) | |
1067 | rv = nfserrno(PTR_ERR(exp)); | |
1068 | else | |
1069 | rv = fh_compose(fhp, exp, | |
1070 | fsid_key->ek_dentry, NULL); | |
1da177e4 LT |
1071 | expkey_put(&fsid_key->h, &svc_expkey_cache); |
1072 | return rv; | |
1073 | } | |
1074 | ||
1075 | /* Iterator */ | |
1076 | ||
1077 | static void *e_start(struct seq_file *m, loff_t *pos) | |
1078 | { | |
1079 | loff_t n = *pos; | |
1080 | unsigned hash, export; | |
1081 | struct cache_head *ch; | |
1082 | ||
1083 | exp_readlock(); | |
1084 | read_lock(&svc_export_cache.hash_lock); | |
1085 | if (!n--) | |
1086 | return (void *)1; | |
1087 | hash = n >> 32; | |
1088 | export = n & ((1LL<<32) - 1); | |
1089 | ||
1090 | ||
1091 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1092 | if (!export--) | |
1093 | return ch; | |
1094 | n &= ~((1LL<<32) - 1); | |
1095 | do { | |
1096 | hash++; | |
1097 | n += 1LL<<32; | |
1098 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1099 | if (hash >= EXPORT_HASHMAX) | |
1100 | return NULL; | |
1101 | *pos = n+1; | |
1102 | return export_table[hash]; | |
1103 | } | |
1104 | ||
1105 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1106 | { | |
1107 | struct cache_head *ch = p; | |
1108 | int hash = (*pos >> 32); | |
1109 | ||
1110 | if (p == (void *)1) | |
1111 | hash = 0; | |
1112 | else if (ch->next == NULL) { | |
1113 | hash++; | |
1114 | *pos += 1LL<<32; | |
1115 | } else { | |
1116 | ++*pos; | |
1117 | return ch->next; | |
1118 | } | |
1119 | *pos &= ~((1LL<<32) - 1); | |
1120 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1121 | hash++; | |
1122 | *pos += 1LL<<32; | |
1123 | } | |
1124 | if (hash >= EXPORT_HASHMAX) | |
1125 | return NULL; | |
1126 | ++*pos; | |
1127 | return export_table[hash]; | |
1128 | } | |
1129 | ||
1130 | static void e_stop(struct seq_file *m, void *p) | |
1131 | { | |
1132 | read_unlock(&svc_export_cache.hash_lock); | |
1133 | exp_readunlock(); | |
1134 | } | |
1135 | ||
1136 | static struct flags { | |
1137 | int flag; | |
1138 | char *name[2]; | |
1139 | } expflags[] = { | |
1140 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1141 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1142 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1143 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1144 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1145 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1146 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1147 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1148 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1149 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1150 | #ifdef MSNFS | |
1151 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1152 | #endif | |
1153 | { 0, {"", ""}} | |
1154 | }; | |
1155 | ||
1156 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong) | |
1157 | { | |
1158 | int first = 0; | |
1159 | struct flags *flg; | |
1160 | ||
1161 | for (flg = expflags; flg->flag; flg++) { | |
1162 | int state = (flg->flag & flag)?0:1; | |
1163 | if (*flg->name[state]) | |
1164 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1165 | } | |
1166 | if (flag & NFSEXP_FSID) | |
1167 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); | |
1168 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) | |
1169 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); | |
1170 | if (anong != (gid_t)-2 && anong != (0x10000-2)) | |
1171 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); | |
1172 | } | |
1173 | ||
1174 | static int e_show(struct seq_file *m, void *p) | |
1175 | { | |
1176 | struct cache_head *cp = p; | |
1177 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1178 | svc_client *clp; | |
1179 | ||
1180 | if (p == (void *)1) { | |
1181 | seq_puts(m, "# Version 1.1\n"); | |
1182 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1183 | return 0; | |
1184 | } | |
1185 | ||
1186 | clp = exp->ex_client; | |
1187 | cache_get(&exp->h); | |
1188 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1189 | return 0; | |
1190 | if (cache_put(&exp->h, &svc_export_cache)) BUG(); | |
1191 | return svc_export_show(m, &svc_export_cache, cp); | |
1192 | } | |
1193 | ||
1194 | struct seq_operations nfs_exports_op = { | |
1195 | .start = e_start, | |
1196 | .next = e_next, | |
1197 | .stop = e_stop, | |
1198 | .show = e_show, | |
1199 | }; | |
1200 | ||
1201 | /* | |
1202 | * Add or modify a client. | |
1203 | * Change requests may involve the list of host addresses. The list of | |
1204 | * exports and possibly existing uid maps are left untouched. | |
1205 | */ | |
1206 | int | |
1207 | exp_addclient(struct nfsctl_client *ncp) | |
1208 | { | |
1209 | struct auth_domain *dom; | |
1210 | int i, err; | |
1211 | ||
1212 | /* First, consistency check. */ | |
1213 | err = -EINVAL; | |
1214 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1215 | goto out; | |
1216 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1217 | goto out; | |
1218 | ||
1219 | /* Lock the hashtable */ | |
1220 | exp_writelock(); | |
1221 | ||
1222 | dom = unix_domain_find(ncp->cl_ident); | |
1223 | ||
1224 | err = -ENOMEM; | |
1225 | if (!dom) | |
1226 | goto out_unlock; | |
1227 | ||
1228 | /* Insert client into hashtable. */ | |
1229 | for (i = 0; i < ncp->cl_naddr; i++) | |
1230 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); | |
1231 | ||
1232 | auth_unix_forget_old(dom); | |
1233 | auth_domain_put(dom); | |
1234 | ||
1235 | err = 0; | |
1236 | ||
1237 | out_unlock: | |
1238 | exp_writeunlock(); | |
1239 | out: | |
1240 | return err; | |
1241 | } | |
1242 | ||
1243 | /* | |
1244 | * Delete a client given an identifier. | |
1245 | */ | |
1246 | int | |
1247 | exp_delclient(struct nfsctl_client *ncp) | |
1248 | { | |
1249 | int err; | |
1250 | struct auth_domain *dom; | |
1251 | ||
1252 | err = -EINVAL; | |
1253 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1254 | goto out; | |
1255 | ||
1256 | /* Lock the hashtable */ | |
1257 | exp_writelock(); | |
1258 | ||
1259 | dom = auth_domain_find(ncp->cl_ident); | |
1260 | /* just make sure that no addresses work | |
1261 | * and that it will expire soon | |
1262 | */ | |
1263 | if (dom) { | |
1264 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1265 | auth_domain_put(dom); |
1266 | } | |
1267 | ||
1268 | exp_writeunlock(); | |
1269 | out: | |
1270 | return err; | |
1271 | } | |
1272 | ||
1273 | /* | |
1274 | * Verify that string is non-empty and does not exceed max length. | |
1275 | */ | |
1276 | static int | |
1277 | exp_verify_string(char *cp, int max) | |
1278 | { | |
1279 | int i; | |
1280 | ||
1281 | for (i = 0; i < max; i++) | |
1282 | if (!cp[i]) | |
1283 | return i; | |
1284 | cp[i] = 0; | |
1285 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1286 | return 0; | |
1287 | } | |
1288 | ||
1289 | /* | |
1290 | * Initialize the exports module. | |
1291 | */ | |
1292 | void | |
1293 | nfsd_export_init(void) | |
1294 | { | |
1295 | dprintk("nfsd: initializing export module.\n"); | |
1296 | ||
1297 | cache_register(&svc_export_cache); | |
1298 | cache_register(&svc_expkey_cache); | |
1299 | ||
1300 | } | |
1301 | ||
1302 | /* | |
1303 | * Flush exports table - called when last nfsd thread is killed | |
1304 | */ | |
1305 | void | |
1306 | nfsd_export_flush(void) | |
1307 | { | |
1308 | exp_writelock(); | |
1309 | cache_purge(&svc_expkey_cache); | |
1310 | cache_purge(&svc_export_cache); | |
1311 | exp_writeunlock(); | |
1312 | } | |
1313 | ||
1314 | /* | |
1315 | * Shutdown the exports module. | |
1316 | */ | |
1317 | void | |
1318 | nfsd_export_shutdown(void) | |
1319 | { | |
1320 | ||
1321 | dprintk("nfsd: shutting down export module.\n"); | |
1322 | ||
1323 | exp_writelock(); | |
1324 | ||
1325 | if (cache_unregister(&svc_expkey_cache)) | |
1326 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); | |
1327 | if (cache_unregister(&svc_export_cache)) | |
1328 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); | |
1329 | svcauth_unix_purge(); | |
1330 | ||
1331 | exp_writeunlock(); | |
1332 | dprintk("nfsd: export shutdown complete.\n"); | |
1333 | } |