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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 | ||
74cae61a | 60 | static 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 *); | |
74cae61a AB |
90 | static struct cache_detail svc_expkey_cache; |
91 | ||
1da177e4 LT |
92 | static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen) |
93 | { | |
94 | /* client fsidtype fsid [path] */ | |
95 | char *buf; | |
96 | int len; | |
97 | struct auth_domain *dom = NULL; | |
98 | int err; | |
99 | int fsidtype; | |
100 | char *ep; | |
101 | struct svc_expkey key; | |
8d270f7f | 102 | struct svc_expkey *ek; |
1da177e4 LT |
103 | |
104 | if (mesg[mlen-1] != '\n') | |
105 | return -EINVAL; | |
106 | mesg[mlen-1] = 0; | |
107 | ||
108 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
109 | err = -ENOMEM; | |
110 | if (!buf) goto out; | |
111 | ||
112 | err = -EINVAL; | |
113 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
114 | goto out; | |
115 | ||
116 | err = -ENOENT; | |
117 | dom = auth_domain_find(buf); | |
118 | if (!dom) | |
119 | goto out; | |
120 | dprintk("found domain %s\n", buf); | |
121 | ||
122 | err = -EINVAL; | |
123 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
124 | goto out; | |
125 | fsidtype = simple_strtoul(buf, &ep, 10); | |
126 | if (*ep) | |
127 | goto out; | |
128 | dprintk("found fsidtype %d\n", fsidtype); | |
4bdff8c0 | 129 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
130 | goto out; |
131 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
132 | goto out; | |
133 | dprintk("found fsid length %d\n", len); | |
134 | if (len != key_len(fsidtype)) | |
135 | goto out; | |
136 | ||
137 | /* OK, we seem to have a valid key */ | |
138 | key.h.flags = 0; | |
139 | key.h.expiry_time = get_expiry(&mesg); | |
140 | if (key.h.expiry_time == 0) | |
141 | goto out; | |
142 | ||
143 | key.ek_client = dom; | |
144 | key.ek_fsidtype = fsidtype; | |
145 | memcpy(key.ek_fsid, buf, len); | |
146 | ||
8d270f7f N |
147 | ek = svc_expkey_lookup(&key); |
148 | err = -ENOMEM; | |
149 | if (!ek) | |
150 | goto out; | |
151 | ||
1da177e4 | 152 | /* now we want a pathname, or empty meaning NEGATIVE */ |
8d270f7f | 153 | err = -EINVAL; |
1da177e4 LT |
154 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0) |
155 | goto out; | |
156 | dprintk("Path seems to be <%s>\n", buf); | |
157 | err = 0; | |
158 | if (len == 0) { | |
1da177e4 | 159 | set_bit(CACHE_NEGATIVE, &key.h.flags); |
8d270f7f | 160 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 161 | if (ek) |
baab935f | 162 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f | 163 | else err = -ENOMEM; |
1da177e4 LT |
164 | } else { |
165 | struct nameidata nd; | |
1da177e4 LT |
166 | err = path_lookup(buf, 0, &nd); |
167 | if (err) | |
168 | goto out; | |
169 | ||
170 | dprintk("Found the path %s\n", buf); | |
eab7e2e6 N |
171 | key.ek_mnt = nd.mnt; |
172 | key.ek_dentry = nd.dentry; | |
1da177e4 | 173 | |
8d270f7f | 174 | ek = svc_expkey_update(&key, ek); |
1da177e4 | 175 | if (ek) |
baab935f | 176 | cache_put(&ek->h, &svc_expkey_cache); |
8d270f7f N |
177 | else |
178 | err = -ENOMEM; | |
1da177e4 LT |
179 | path_release(&nd); |
180 | } | |
181 | cache_flush(); | |
182 | out: | |
183 | if (dom) | |
184 | auth_domain_put(dom); | |
f99d49ad | 185 | kfree(buf); |
1da177e4 LT |
186 | return err; |
187 | } | |
188 | ||
189 | static int expkey_show(struct seq_file *m, | |
190 | struct cache_detail *cd, | |
191 | struct cache_head *h) | |
192 | { | |
193 | struct svc_expkey *ek ; | |
194 | ||
195 | if (h ==NULL) { | |
196 | seq_puts(m, "#domain fsidtype fsid [path]\n"); | |
197 | return 0; | |
198 | } | |
199 | ek = container_of(h, struct svc_expkey, h); | |
200 | seq_printf(m, "%s %d 0x%08x", ek->ek_client->name, | |
201 | ek->ek_fsidtype, ek->ek_fsid[0]); | |
202 | if (ek->ek_fsidtype != 1) | |
203 | seq_printf(m, "%08x", ek->ek_fsid[1]); | |
204 | if (ek->ek_fsidtype == 2) | |
205 | seq_printf(m, "%08x", ek->ek_fsid[2]); | |
206 | if (test_bit(CACHE_VALID, &h->flags) && | |
207 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
208 | seq_printf(m, " "); | |
eab7e2e6 | 209 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
1da177e4 LT |
210 | } |
211 | seq_printf(m, "\n"); | |
212 | return 0; | |
213 | } | |
1da177e4 | 214 | |
8d270f7f | 215 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 216 | { |
8d270f7f N |
217 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
218 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
219 | ||
220 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
221 | orig->ek_client != new->ek_client || | |
222 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
223 | return 0; |
224 | return 1; | |
225 | } | |
226 | ||
8d270f7f N |
227 | static inline void expkey_init(struct cache_head *cnew, |
228 | struct cache_head *citem) | |
1da177e4 | 229 | { |
8d270f7f N |
230 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
231 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
232 | ||
efc36aa5 | 233 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
234 | new->ek_client = item->ek_client; |
235 | new->ek_fsidtype = item->ek_fsidtype; | |
236 | new->ek_fsid[0] = item->ek_fsid[0]; | |
237 | new->ek_fsid[1] = item->ek_fsid[1]; | |
238 | new->ek_fsid[2] = item->ek_fsid[2]; | |
239 | } | |
240 | ||
8d270f7f N |
241 | static inline void expkey_update(struct cache_head *cnew, |
242 | struct cache_head *citem) | |
1da177e4 | 243 | { |
8d270f7f N |
244 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
245 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
246 | ||
eab7e2e6 N |
247 | new->ek_mnt = mntget(item->ek_mnt); |
248 | new->ek_dentry = dget(item->ek_dentry); | |
1da177e4 LT |
249 | } |
250 | ||
8d270f7f N |
251 | static struct cache_head *expkey_alloc(void) |
252 | { | |
253 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
254 | if (i) | |
255 | return &i->h; | |
256 | else | |
257 | return NULL; | |
258 | } | |
259 | ||
74cae61a | 260 | static struct cache_detail svc_expkey_cache = { |
8d270f7f N |
261 | .owner = THIS_MODULE, |
262 | .hash_size = EXPKEY_HASHMAX, | |
263 | .hash_table = expkey_table, | |
264 | .name = "nfsd.fh", | |
265 | .cache_put = expkey_put, | |
266 | .cache_request = expkey_request, | |
267 | .cache_parse = expkey_parse, | |
268 | .cache_show = expkey_show, | |
269 | .match = expkey_match, | |
270 | .init = expkey_init, | |
271 | .update = expkey_update, | |
272 | .alloc = expkey_alloc, | |
273 | }; | |
274 | ||
275 | static struct svc_expkey * | |
276 | svc_expkey_lookup(struct svc_expkey *item) | |
277 | { | |
278 | struct cache_head *ch; | |
279 | int hash = item->ek_fsidtype; | |
280 | char * cp = (char*)item->ek_fsid; | |
281 | int len = key_len(item->ek_fsidtype); | |
282 | ||
283 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
284 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
285 | hash &= EXPKEY_HASHMASK; | |
286 | ||
287 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
288 | hash); | |
289 | if (ch) | |
290 | return container_of(ch, struct svc_expkey, h); | |
291 | else | |
292 | return NULL; | |
293 | } | |
294 | ||
295 | static struct svc_expkey * | |
296 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
297 | { | |
298 | struct cache_head *ch; | |
299 | int hash = new->ek_fsidtype; | |
300 | char * cp = (char*)new->ek_fsid; | |
301 | int len = key_len(new->ek_fsidtype); | |
302 | ||
303 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
304 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); | |
305 | hash &= EXPKEY_HASHMASK; | |
306 | ||
307 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
308 | &old->h, hash); | |
309 | if (ch) | |
310 | return container_of(ch, struct svc_expkey, h); | |
311 | else | |
312 | return NULL; | |
313 | } | |
314 | ||
1da177e4 LT |
315 | |
316 | #define EXPORT_HASHBITS 8 | |
317 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
318 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
319 | ||
320 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
321 | ||
baab935f | 322 | static void svc_export_put(struct kref *ref) |
1da177e4 | 323 | { |
baab935f N |
324 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
325 | dput(exp->ex_dentry); | |
326 | mntput(exp->ex_mnt); | |
327 | auth_domain_put(exp->ex_client); | |
328 | kfree(exp); | |
1da177e4 LT |
329 | } |
330 | ||
331 | static void svc_export_request(struct cache_detail *cd, | |
332 | struct cache_head *h, | |
333 | char **bpp, int *blen) | |
334 | { | |
335 | /* client path */ | |
336 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
337 | char *pth; | |
338 | ||
339 | qword_add(bpp, blen, exp->ex_client->name); | |
340 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
341 | if (IS_ERR(pth)) { | |
342 | /* is this correct? */ | |
343 | (*bpp)[0] = '\n'; | |
344 | return; | |
345 | } | |
346 | qword_add(bpp, blen, pth); | |
347 | (*bpp)[-1] = '\n'; | |
348 | } | |
349 | ||
74cae61a AB |
350 | static struct svc_export *svc_export_update(struct svc_export *new, |
351 | struct svc_export *old); | |
4f7774c3 | 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)) { | |
3e3b4800 | 373 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
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); | |
cd156549 | 425 | if (err) goto out_no_path; |
1da177e4 LT |
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); | |
cd156549 | 478 | out_no_path: |
1da177e4 LT |
479 | if (dom) |
480 | auth_domain_put(dom); | |
f99d49ad | 481 | kfree(buf); |
1da177e4 LT |
482 | return err; |
483 | } | |
484 | ||
485 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong); | |
486 | ||
487 | static int svc_export_show(struct seq_file *m, | |
488 | struct cache_detail *cd, | |
489 | struct cache_head *h) | |
490 | { | |
491 | struct svc_export *exp ; | |
492 | ||
493 | if (h ==NULL) { | |
494 | seq_puts(m, "#path domain(flags)\n"); | |
495 | return 0; | |
496 | } | |
497 | exp = container_of(h, struct svc_export, h); | |
498 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
499 | seq_putc(m, '\t'); | |
500 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
501 | seq_putc(m, '('); | |
502 | if (test_bit(CACHE_VALID, &h->flags) && | |
503 | !test_bit(CACHE_NEGATIVE, &h->flags)) | |
504 | exp_flags(m, exp->ex_flags, exp->ex_fsid, | |
505 | exp->ex_anon_uid, exp->ex_anon_gid); | |
506 | seq_puts(m, ")\n"); | |
507 | return 0; | |
508 | } | |
4f7774c3 | 509 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 510 | { |
4f7774c3 N |
511 | struct svc_export *orig = container_of(a, struct svc_export, h); |
512 | struct svc_export *new = container_of(b, struct svc_export, h); | |
513 | return orig->ex_client == new->ex_client && | |
514 | orig->ex_dentry == new->ex_dentry && | |
515 | orig->ex_mnt == new->ex_mnt; | |
1da177e4 | 516 | } |
4f7774c3 N |
517 | |
518 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 519 | { |
4f7774c3 N |
520 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
521 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
522 | ||
efc36aa5 | 523 | kref_get(&item->ex_client->ref); |
1da177e4 LT |
524 | new->ex_client = item->ex_client; |
525 | new->ex_dentry = dget(item->ex_dentry); | |
526 | new->ex_mnt = mntget(item->ex_mnt); | |
527 | } | |
528 | ||
4f7774c3 | 529 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 530 | { |
4f7774c3 N |
531 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
532 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
533 | ||
1da177e4 LT |
534 | new->ex_flags = item->ex_flags; |
535 | new->ex_anon_uid = item->ex_anon_uid; | |
536 | new->ex_anon_gid = item->ex_anon_gid; | |
537 | new->ex_fsid = item->ex_fsid; | |
538 | } | |
539 | ||
4f7774c3 N |
540 | static struct cache_head *svc_export_alloc(void) |
541 | { | |
542 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
543 | if (i) | |
544 | return &i->h; | |
545 | else | |
546 | return NULL; | |
547 | } | |
548 | ||
549 | struct cache_detail svc_export_cache = { | |
550 | .owner = THIS_MODULE, | |
551 | .hash_size = EXPORT_HASHMAX, | |
552 | .hash_table = export_table, | |
553 | .name = "nfsd.export", | |
554 | .cache_put = svc_export_put, | |
555 | .cache_request = svc_export_request, | |
556 | .cache_parse = svc_export_parse, | |
557 | .cache_show = svc_export_show, | |
558 | .match = svc_export_match, | |
559 | .init = svc_export_init, | |
560 | .update = export_update, | |
561 | .alloc = svc_export_alloc, | |
562 | }; | |
563 | ||
564 | static struct svc_export * | |
565 | svc_export_lookup(struct svc_export *exp) | |
566 | { | |
567 | struct cache_head *ch; | |
568 | int hash; | |
569 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
570 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); | |
571 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); | |
572 | ||
573 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
574 | hash); | |
575 | if (ch) | |
576 | return container_of(ch, struct svc_export, h); | |
577 | else | |
578 | return NULL; | |
579 | } | |
580 | ||
74cae61a | 581 | static struct svc_export * |
4f7774c3 N |
582 | svc_export_update(struct svc_export *new, struct svc_export *old) |
583 | { | |
584 | struct cache_head *ch; | |
585 | int hash; | |
586 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
587 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); | |
588 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); | |
589 | ||
590 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
591 | &old->h, | |
592 | hash); | |
593 | if (ch) | |
594 | return container_of(ch, struct svc_export, h); | |
595 | else | |
596 | return NULL; | |
597 | } | |
1da177e4 LT |
598 | |
599 | ||
74cae61a | 600 | static struct svc_expkey * |
1da177e4 LT |
601 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
602 | { | |
603 | struct svc_expkey key, *ek; | |
604 | int err; | |
605 | ||
606 | if (!clp) | |
607 | return NULL; | |
608 | ||
609 | key.ek_client = clp; | |
610 | key.ek_fsidtype = fsid_type; | |
611 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
612 | ||
8d270f7f | 613 | ek = svc_expkey_lookup(&key); |
1da177e4 LT |
614 | if (ek != NULL) |
615 | if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) | |
616 | ek = ERR_PTR(err); | |
617 | return ek; | |
618 | } | |
619 | ||
620 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
621 | struct svc_export *exp) | |
622 | { | |
623 | struct svc_expkey key, *ek; | |
624 | ||
625 | key.ek_client = clp; | |
626 | key.ek_fsidtype = fsid_type; | |
627 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
eab7e2e6 N |
628 | key.ek_mnt = exp->ex_mnt; |
629 | key.ek_dentry = exp->ex_dentry; | |
1da177e4 LT |
630 | key.h.expiry_time = NEVER; |
631 | key.h.flags = 0; | |
632 | ||
8d270f7f N |
633 | ek = svc_expkey_lookup(&key); |
634 | if (ek) | |
635 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 636 | if (ek) { |
baab935f | 637 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
638 | return 0; |
639 | } | |
640 | return -ENOMEM; | |
641 | } | |
642 | ||
643 | /* | |
644 | * Find the client's export entry matching xdev/xino. | |
645 | */ | |
646 | static inline struct svc_expkey * | |
647 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
648 | { | |
649 | u32 fsidv[3]; | |
650 | ||
651 | if (old_valid_dev(dev)) { | |
652 | mk_fsid_v0(fsidv, dev, ino); | |
653 | return exp_find_key(clp, 0, fsidv, NULL); | |
654 | } | |
655 | mk_fsid_v3(fsidv, dev, ino); | |
656 | return exp_find_key(clp, 3, fsidv, NULL); | |
657 | } | |
658 | ||
659 | /* | |
660 | * Find the client's export entry matching fsid | |
661 | */ | |
662 | static inline struct svc_expkey * | |
663 | exp_get_fsid_key(svc_client *clp, int fsid) | |
664 | { | |
665 | u32 fsidv[2]; | |
666 | ||
667 | mk_fsid_v1(fsidv, fsid); | |
668 | ||
669 | return exp_find_key(clp, 1, fsidv, NULL); | |
670 | } | |
671 | ||
672 | svc_export * | |
673 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
674 | struct cache_req *reqp) | |
675 | { | |
676 | struct svc_export *exp, key; | |
677 | ||
678 | if (!clp) | |
679 | return NULL; | |
680 | ||
681 | key.ex_client = clp; | |
682 | key.ex_mnt = mnt; | |
683 | key.ex_dentry = dentry; | |
684 | ||
4f7774c3 | 685 | exp = svc_export_lookup(&key); |
1da177e4 LT |
686 | if (exp != NULL) |
687 | switch (cache_check(&svc_export_cache, &exp->h, reqp)) { | |
688 | case 0: break; | |
689 | case -EAGAIN: | |
690 | exp = ERR_PTR(-EAGAIN); | |
691 | break; | |
692 | default: | |
693 | exp = NULL; | |
694 | } | |
695 | ||
696 | return exp; | |
697 | } | |
698 | ||
699 | /* | |
700 | * Find the export entry for a given dentry. | |
701 | */ | |
702 | struct svc_export * | |
703 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
704 | struct cache_req *reqp) | |
705 | { | |
706 | svc_export *exp; | |
707 | ||
708 | dget(dentry); | |
709 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
710 | ||
711 | while (exp == NULL && !IS_ROOT(dentry)) { | |
712 | struct dentry *parent; | |
713 | ||
714 | parent = dget_parent(dentry); | |
715 | dput(dentry); | |
716 | dentry = parent; | |
717 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
718 | } | |
719 | dput(dentry); | |
720 | return exp; | |
721 | } | |
722 | ||
723 | /* | |
724 | * Hashtable locking. Write locks are placed only by user processes | |
725 | * wanting to modify export information. | |
726 | * Write locking only done in this file. Read locking | |
727 | * needed externally. | |
728 | */ | |
729 | ||
730 | static DECLARE_RWSEM(hash_sem); | |
731 | ||
732 | void | |
733 | exp_readlock(void) | |
734 | { | |
735 | down_read(&hash_sem); | |
736 | } | |
737 | ||
738 | static inline void | |
739 | exp_writelock(void) | |
740 | { | |
741 | down_write(&hash_sem); | |
742 | } | |
743 | ||
744 | void | |
745 | exp_readunlock(void) | |
746 | { | |
747 | up_read(&hash_sem); | |
748 | } | |
749 | ||
750 | static inline void | |
751 | exp_writeunlock(void) | |
752 | { | |
753 | up_write(&hash_sem); | |
754 | } | |
755 | ||
756 | static void exp_fsid_unhash(struct svc_export *exp) | |
757 | { | |
758 | struct svc_expkey *ek; | |
759 | ||
760 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
761 | return; | |
762 | ||
763 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
764 | if (ek && !IS_ERR(ek)) { | |
765 | ek->h.expiry_time = get_seconds()-1; | |
baab935f | 766 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
767 | } |
768 | svc_expkey_cache.nextcheck = get_seconds(); | |
769 | } | |
770 | ||
771 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
772 | { | |
773 | u32 fsid[2]; | |
774 | ||
775 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
776 | return 0; | |
777 | ||
778 | mk_fsid_v1(fsid, exp->ex_fsid); | |
779 | return exp_set_key(clp, 1, fsid, exp); | |
780 | } | |
781 | ||
782 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
783 | { | |
784 | u32 fsid[2]; | |
785 | struct inode *inode = exp->ex_dentry->d_inode; | |
786 | dev_t dev = inode->i_sb->s_dev; | |
787 | ||
788 | if (old_valid_dev(dev)) { | |
789 | mk_fsid_v0(fsid, dev, inode->i_ino); | |
790 | return exp_set_key(clp, 0, fsid, exp); | |
791 | } | |
792 | mk_fsid_v3(fsid, dev, inode->i_ino); | |
793 | return exp_set_key(clp, 3, fsid, exp); | |
794 | } | |
795 | ||
796 | static void exp_unhash(struct svc_export *exp) | |
797 | { | |
798 | struct svc_expkey *ek; | |
799 | struct inode *inode = exp->ex_dentry->d_inode; | |
800 | ||
801 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
802 | if (ek && !IS_ERR(ek)) { | |
803 | ek->h.expiry_time = get_seconds()-1; | |
baab935f | 804 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
805 | } |
806 | svc_expkey_cache.nextcheck = get_seconds(); | |
807 | } | |
808 | ||
809 | /* | |
810 | * Export a file system. | |
811 | */ | |
812 | int | |
813 | exp_export(struct nfsctl_export *nxp) | |
814 | { | |
815 | svc_client *clp; | |
816 | struct svc_export *exp = NULL; | |
817 | struct svc_export new; | |
818 | struct svc_expkey *fsid_key = NULL; | |
819 | struct nameidata nd; | |
820 | int err; | |
821 | ||
822 | /* Consistency check */ | |
823 | err = -EINVAL; | |
824 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
825 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
826 | goto out; | |
827 | ||
828 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
829 | nxp->ex_client, nxp->ex_path, | |
830 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
831 | nxp->ex_flags); | |
832 | ||
833 | /* Try to lock the export table for update */ | |
834 | exp_writelock(); | |
835 | ||
836 | /* Look up client info */ | |
837 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
838 | goto out_unlock; | |
839 | ||
840 | ||
841 | /* Look up the dentry */ | |
842 | err = path_lookup(nxp->ex_path, 0, &nd); | |
843 | if (err) | |
844 | goto out_unlock; | |
845 | err = -EINVAL; | |
846 | ||
847 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); | |
848 | ||
849 | /* must make sure there won't be an ex_fsid clash */ | |
850 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
851 | (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && | |
852 | !IS_ERR(fsid_key) && | |
eab7e2e6 N |
853 | fsid_key->ek_mnt && |
854 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) | |
1da177e4 LT |
855 | goto finish; |
856 | ||
857 | if (exp) { | |
858 | /* just a flags/id/fsid update */ | |
859 | ||
860 | exp_fsid_unhash(exp); | |
861 | exp->ex_flags = nxp->ex_flags; | |
862 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
863 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
864 | exp->ex_fsid = nxp->ex_dev; | |
865 | ||
866 | err = exp_fsid_hash(clp, exp); | |
867 | goto finish; | |
868 | } | |
869 | ||
870 | err = check_export(nd.dentry->d_inode, nxp->ex_flags); | |
871 | if (err) goto finish; | |
872 | ||
873 | err = -ENOMEM; | |
874 | ||
875 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
876 | ||
877 | new.h.expiry_time = NEVER; | |
878 | new.h.flags = 0; | |
879 | new.ex_client = clp; | |
880 | new.ex_mnt = nd.mnt; | |
881 | new.ex_dentry = nd.dentry; | |
882 | new.ex_flags = nxp->ex_flags; | |
883 | new.ex_anon_uid = nxp->ex_anon_uid; | |
884 | new.ex_anon_gid = nxp->ex_anon_gid; | |
885 | new.ex_fsid = nxp->ex_dev; | |
886 | ||
4f7774c3 N |
887 | exp = svc_export_lookup(&new); |
888 | if (exp) | |
889 | exp = svc_export_update(&new, exp); | |
1da177e4 | 890 | |
4f7774c3 | 891 | if (!exp) |
1da177e4 LT |
892 | goto finish; |
893 | ||
1da177e4 LT |
894 | if (exp_hash(clp, exp) || |
895 | exp_fsid_hash(clp, exp)) { | |
896 | /* failed to create at least one index */ | |
897 | exp_do_unexport(exp); | |
898 | cache_flush(); | |
899 | err = -ENOMEM; | |
900 | } | |
901 | ||
902 | finish: | |
903 | if (exp) | |
904 | exp_put(exp); | |
905 | if (fsid_key && !IS_ERR(fsid_key)) | |
baab935f | 906 | cache_put(&fsid_key->h, &svc_expkey_cache); |
1da177e4 LT |
907 | if (clp) |
908 | auth_domain_put(clp); | |
909 | path_release(&nd); | |
910 | out_unlock: | |
911 | exp_writeunlock(); | |
912 | out: | |
913 | return err; | |
914 | } | |
915 | ||
916 | /* | |
917 | * Unexport a file system. The export entry has already | |
918 | * been removed from the client's list of exported fs's. | |
919 | */ | |
920 | static void | |
921 | exp_do_unexport(svc_export *unexp) | |
922 | { | |
923 | unexp->h.expiry_time = get_seconds()-1; | |
924 | svc_export_cache.nextcheck = get_seconds(); | |
925 | exp_unhash(unexp); | |
926 | exp_fsid_unhash(unexp); | |
927 | } | |
928 | ||
929 | ||
930 | /* | |
931 | * unexport syscall. | |
932 | */ | |
933 | int | |
934 | exp_unexport(struct nfsctl_export *nxp) | |
935 | { | |
936 | struct auth_domain *dom; | |
937 | svc_export *exp; | |
938 | struct nameidata nd; | |
939 | int err; | |
940 | ||
941 | /* Consistency check */ | |
942 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
943 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
944 | return -EINVAL; | |
945 | ||
946 | exp_writelock(); | |
947 | ||
948 | err = -EINVAL; | |
949 | dom = auth_domain_find(nxp->ex_client); | |
950 | if (!dom) { | |
951 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
952 | goto out_unlock; | |
953 | } | |
954 | ||
955 | err = path_lookup(nxp->ex_path, 0, &nd); | |
956 | if (err) | |
957 | goto out_domain; | |
958 | ||
959 | err = -EINVAL; | |
960 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); | |
961 | path_release(&nd); | |
962 | if (!exp) | |
963 | goto out_domain; | |
964 | ||
965 | exp_do_unexport(exp); | |
966 | exp_put(exp); | |
967 | err = 0; | |
968 | ||
969 | out_domain: | |
970 | auth_domain_put(dom); | |
971 | cache_flush(); | |
972 | out_unlock: | |
973 | exp_writeunlock(); | |
974 | return err; | |
975 | } | |
976 | ||
977 | /* | |
978 | * Obtain the root fh on behalf of a client. | |
979 | * This could be done in user space, but I feel that it adds some safety | |
980 | * since its harder to fool a kernel module than a user space program. | |
981 | */ | |
982 | int | |
983 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
984 | { | |
985 | struct svc_export *exp; | |
986 | struct nameidata nd; | |
987 | struct inode *inode; | |
988 | struct svc_fh fh; | |
989 | int err; | |
990 | ||
991 | err = -EPERM; | |
992 | /* NB: we probably ought to check that it's NUL-terminated */ | |
993 | if (path_lookup(path, 0, &nd)) { | |
994 | printk("nfsd: exp_rootfh path not found %s", path); | |
995 | return err; | |
996 | } | |
997 | inode = nd.dentry->d_inode; | |
998 | ||
999 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
1000 | path, nd.dentry, clp->name, | |
1001 | inode->i_sb->s_id, inode->i_ino); | |
1002 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); | |
1003 | if (!exp) { | |
1004 | dprintk("nfsd: exp_rootfh export not found.\n"); | |
1005 | goto out; | |
1006 | } | |
1007 | ||
1008 | /* | |
1009 | * fh must be initialized before calling fh_compose | |
1010 | */ | |
1011 | fh_init(&fh, maxsize); | |
1012 | if (fh_compose(&fh, exp, nd.dentry, NULL)) | |
1013 | err = -EINVAL; | |
1014 | else | |
1015 | err = 0; | |
1016 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1017 | fh_put(&fh); | |
1018 | exp_put(exp); | |
1019 | out: | |
1020 | path_release(&nd); | |
1021 | return err; | |
1022 | } | |
1023 | ||
eab7e2e6 N |
1024 | struct svc_export * |
1025 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, | |
1026 | struct cache_req *reqp) | |
1027 | { | |
1028 | struct svc_export *exp; | |
1029 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
1030 | if (!ek || IS_ERR(ek)) | |
1031 | return ERR_PTR(PTR_ERR(ek)); | |
1032 | ||
1033 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
baab935f | 1034 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 N |
1035 | |
1036 | if (!exp || IS_ERR(exp)) | |
1037 | return ERR_PTR(PTR_ERR(exp)); | |
1038 | return exp; | |
1039 | } | |
1040 | ||
1041 | ||
1da177e4 LT |
1042 | /* |
1043 | * Called when we need the filehandle for the root of the pseudofs, | |
1044 | * for a given NFSv4 client. The root is defined to be the | |
1045 | * export point with fsid==0 | |
1046 | */ | |
1047 | int | |
1048 | exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, | |
1049 | struct cache_req *creq) | |
1050 | { | |
eab7e2e6 | 1051 | struct svc_export *exp; |
1da177e4 LT |
1052 | int rv; |
1053 | u32 fsidv[2]; | |
1054 | ||
1055 | mk_fsid_v1(fsidv, 0); | |
1056 | ||
f38b20c6 BF |
1057 | exp = exp_find(clp, 1, fsidv, creq); |
1058 | if (IS_ERR(exp) && PTR_ERR(exp) == -EAGAIN) | |
1da177e4 | 1059 | return nfserr_dropit; |
eab7e2e6 N |
1060 | if (exp == NULL) |
1061 | rv = nfserr_perm; | |
1062 | else if (IS_ERR(exp)) | |
1063 | rv = nfserrno(PTR_ERR(exp)); | |
f2d39586 | 1064 | else { |
eab7e2e6 | 1065 | rv = fh_compose(fhp, exp, |
f38b20c6 | 1066 | exp->ex_dentry, NULL); |
f2d39586 N |
1067 | exp_put(exp); |
1068 | } | |
1da177e4 LT |
1069 | return rv; |
1070 | } | |
1071 | ||
1072 | /* Iterator */ | |
1073 | ||
1074 | static void *e_start(struct seq_file *m, loff_t *pos) | |
896440d5 | 1075 | __acquires(svc_export_cache.hash_lock) |
1da177e4 LT |
1076 | { |
1077 | loff_t n = *pos; | |
1078 | unsigned hash, export; | |
1079 | struct cache_head *ch; | |
1080 | ||
1081 | exp_readlock(); | |
1082 | read_lock(&svc_export_cache.hash_lock); | |
1083 | if (!n--) | |
bc6f02e5 | 1084 | return SEQ_START_TOKEN; |
1da177e4 LT |
1085 | hash = n >> 32; |
1086 | export = n & ((1LL<<32) - 1); | |
1087 | ||
1088 | ||
1089 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1090 | if (!export--) | |
1091 | return ch; | |
1092 | n &= ~((1LL<<32) - 1); | |
1093 | do { | |
1094 | hash++; | |
1095 | n += 1LL<<32; | |
1096 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1097 | if (hash >= EXPORT_HASHMAX) | |
1098 | return NULL; | |
1099 | *pos = n+1; | |
1100 | return export_table[hash]; | |
1101 | } | |
1102 | ||
1103 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1104 | { | |
1105 | struct cache_head *ch = p; | |
1106 | int hash = (*pos >> 32); | |
1107 | ||
bc6f02e5 | 1108 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1109 | hash = 0; |
1110 | else if (ch->next == NULL) { | |
1111 | hash++; | |
1112 | *pos += 1LL<<32; | |
1113 | } else { | |
1114 | ++*pos; | |
1115 | return ch->next; | |
1116 | } | |
1117 | *pos &= ~((1LL<<32) - 1); | |
1118 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1119 | hash++; | |
1120 | *pos += 1LL<<32; | |
1121 | } | |
1122 | if (hash >= EXPORT_HASHMAX) | |
1123 | return NULL; | |
1124 | ++*pos; | |
1125 | return export_table[hash]; | |
1126 | } | |
1127 | ||
1128 | static void e_stop(struct seq_file *m, void *p) | |
896440d5 | 1129 | __releases(svc_export_cache.hash_lock) |
1da177e4 LT |
1130 | { |
1131 | read_unlock(&svc_export_cache.hash_lock); | |
1132 | exp_readunlock(); | |
1133 | } | |
1134 | ||
1135 | static struct flags { | |
1136 | int flag; | |
1137 | char *name[2]; | |
1138 | } expflags[] = { | |
1139 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1140 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1141 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1142 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1143 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1144 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1145 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1146 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1147 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1148 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1149 | #ifdef MSNFS | |
1150 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1151 | #endif | |
1152 | { 0, {"", ""}} | |
1153 | }; | |
1154 | ||
1155 | static void exp_flags(struct seq_file *m, int flag, int fsid, uid_t anonu, uid_t anong) | |
1156 | { | |
1157 | int first = 0; | |
1158 | struct flags *flg; | |
1159 | ||
1160 | for (flg = expflags; flg->flag; flg++) { | |
1161 | int state = (flg->flag & flag)?0:1; | |
1162 | if (*flg->name[state]) | |
1163 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1164 | } | |
1165 | if (flag & NFSEXP_FSID) | |
1166 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); | |
1167 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) | |
1168 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); | |
1169 | if (anong != (gid_t)-2 && anong != (0x10000-2)) | |
1170 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); | |
1171 | } | |
1172 | ||
1173 | static int e_show(struct seq_file *m, void *p) | |
1174 | { | |
1175 | struct cache_head *cp = p; | |
1176 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1da177e4 | 1177 | |
bc6f02e5 | 1178 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1179 | seq_puts(m, "# Version 1.1\n"); |
1180 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1181 | return 0; | |
1182 | } | |
1183 | ||
1da177e4 LT |
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 | } |