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Commit | Line | Data |
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1da177e4 LT |
1 | #define MSNFS /* HACK HACK */ |
2 | /* | |
3 | * linux/fs/nfsd/export.c | |
4 | * | |
5 | * NFS exporting and validation. | |
6 | * | |
7 | * We maintain a list of clients, each of which has a list of | |
8 | * exports. To export an fs to a given client, you first have | |
9 | * to create the client entry with NFSCTL_ADDCLIENT, which | |
10 | * creates a client control block and adds it to the hash | |
11 | * table. Then, you call NFSCTL_EXPORT for each fs. | |
12 | * | |
13 | * | |
14 | * Copyright (C) 1995, 1996 Olaf Kirch, <okir@monad.swb.de> | |
15 | */ | |
16 | ||
17 | #include <linux/unistd.h> | |
18 | #include <linux/slab.h> | |
1da177e4 LT |
19 | #include <linux/stat.h> |
20 | #include <linux/in.h> | |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/syscalls.h> | |
23 | #include <linux/rwsem.h> | |
24 | #include <linux/dcache.h> | |
25 | #include <linux/namei.h> | |
26 | #include <linux/mount.h> | |
27 | #include <linux/hash.h> | |
f35279d3 | 28 | #include <linux/module.h> |
a5694255 | 29 | #include <linux/exportfs.h> |
1da177e4 LT |
30 | |
31 | #include <linux/sunrpc/svc.h> | |
32 | #include <linux/nfsd/nfsd.h> | |
33 | #include <linux/nfsd/nfsfh.h> | |
34 | #include <linux/nfsd/syscall.h> | |
35 | #include <linux/lockd/bind.h> | |
36 | ||
37 | #define NFSDDBG_FACILITY NFSDDBG_EXPORT | |
1da177e4 LT |
38 | |
39 | typedef struct auth_domain svc_client; | |
40 | typedef struct svc_export svc_export; | |
41 | ||
42 | static void exp_do_unexport(svc_export *unexp); | |
43 | static int exp_verify_string(char *cp, int max); | |
44 | ||
45 | /* | |
46 | * We have two caches. | |
47 | * One maps client+vfsmnt+dentry to export options - the export map | |
48 | * The other maps client+filehandle-fragment to export options. - the expkey map | |
49 | * | |
50 | * The export options are actually stored in the first map, and the | |
51 | * second map contains a reference to the entry in the first map. | |
52 | */ | |
53 | ||
54 | #define EXPKEY_HASHBITS 8 | |
55 | #define EXPKEY_HASHMAX (1 << EXPKEY_HASHBITS) | |
56 | #define EXPKEY_HASHMASK (EXPKEY_HASHMAX -1) | |
57 | static struct cache_head *expkey_table[EXPKEY_HASHMAX]; | |
58 | ||
74cae61a | 59 | static void expkey_put(struct kref *ref) |
1da177e4 | 60 | { |
baab935f N |
61 | struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref); |
62 | ||
63 | if (test_bit(CACHE_VALID, &key->h.flags) && | |
64 | !test_bit(CACHE_NEGATIVE, &key->h.flags)) { | |
65 | dput(key->ek_dentry); | |
66 | mntput(key->ek_mnt); | |
1da177e4 | 67 | } |
baab935f N |
68 | auth_domain_put(key->ek_client); |
69 | kfree(key); | |
1da177e4 LT |
70 | } |
71 | ||
72 | static void expkey_request(struct cache_detail *cd, | |
73 | struct cache_head *h, | |
74 | char **bpp, int *blen) | |
75 | { | |
76 | /* client fsidtype \xfsid */ | |
77 | struct svc_expkey *ek = container_of(h, struct svc_expkey, h); | |
78 | char type[5]; | |
79 | ||
80 | qword_add(bpp, blen, ek->ek_client->name); | |
81 | snprintf(type, 5, "%d", ek->ek_fsidtype); | |
82 | qword_add(bpp, blen, type); | |
83 | qword_addhex(bpp, blen, (char*)ek->ek_fsid, key_len(ek->ek_fsidtype)); | |
84 | (*bpp)[-1] = '\n'; | |
85 | } | |
86 | ||
8d270f7f N |
87 | static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old); |
88 | static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *); | |
74cae61a AB |
89 | static struct cache_detail svc_expkey_cache; |
90 | ||
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); | |
4bdff8c0 | 128 | if (key_len(fsidtype)==0) /* invalid type */ |
1da177e4 LT |
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 | 160 | if (ek) |
baab935f | 161 | cache_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 | 174 | if (ek) |
baab935f | 175 | cache_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 ; | |
af6a4e28 | 193 | int i; |
1da177e4 LT |
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); | |
af6a4e28 N |
200 | seq_printf(m, "%s %d 0x", ek->ek_client->name, |
201 | ek->ek_fsidtype); | |
202 | for (i=0; i < key_len(ek->ek_fsidtype)/4; i++) | |
203 | seq_printf(m, "%08x", ek->ek_fsid[i]); | |
1da177e4 LT |
204 | if (test_bit(CACHE_VALID, &h->flags) && |
205 | !test_bit(CACHE_NEGATIVE, &h->flags)) { | |
206 | seq_printf(m, " "); | |
eab7e2e6 | 207 | seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n"); |
1da177e4 LT |
208 | } |
209 | seq_printf(m, "\n"); | |
210 | return 0; | |
211 | } | |
1da177e4 | 212 | |
8d270f7f | 213 | static inline int expkey_match (struct cache_head *a, struct cache_head *b) |
1da177e4 | 214 | { |
8d270f7f N |
215 | struct svc_expkey *orig = container_of(a, struct svc_expkey, h); |
216 | struct svc_expkey *new = container_of(b, struct svc_expkey, h); | |
217 | ||
218 | if (orig->ek_fsidtype != new->ek_fsidtype || | |
219 | orig->ek_client != new->ek_client || | |
220 | memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0) | |
1da177e4 LT |
221 | return 0; |
222 | return 1; | |
223 | } | |
224 | ||
8d270f7f N |
225 | static inline void expkey_init(struct cache_head *cnew, |
226 | struct cache_head *citem) | |
1da177e4 | 227 | { |
8d270f7f N |
228 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
229 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
230 | ||
efc36aa5 | 231 | kref_get(&item->ek_client->ref); |
1da177e4 LT |
232 | new->ek_client = item->ek_client; |
233 | new->ek_fsidtype = item->ek_fsidtype; | |
af6a4e28 N |
234 | |
235 | memcpy(new->ek_fsid, item->ek_fsid, sizeof(new->ek_fsid)); | |
1da177e4 LT |
236 | } |
237 | ||
8d270f7f N |
238 | static inline void expkey_update(struct cache_head *cnew, |
239 | struct cache_head *citem) | |
1da177e4 | 240 | { |
8d270f7f N |
241 | struct svc_expkey *new = container_of(cnew, struct svc_expkey, h); |
242 | struct svc_expkey *item = container_of(citem, struct svc_expkey, h); | |
243 | ||
eab7e2e6 N |
244 | new->ek_mnt = mntget(item->ek_mnt); |
245 | new->ek_dentry = dget(item->ek_dentry); | |
1da177e4 LT |
246 | } |
247 | ||
8d270f7f N |
248 | static struct cache_head *expkey_alloc(void) |
249 | { | |
250 | struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
251 | if (i) | |
252 | return &i->h; | |
253 | else | |
254 | return NULL; | |
255 | } | |
256 | ||
74cae61a | 257 | static struct cache_detail svc_expkey_cache = { |
8d270f7f N |
258 | .owner = THIS_MODULE, |
259 | .hash_size = EXPKEY_HASHMAX, | |
260 | .hash_table = expkey_table, | |
261 | .name = "nfsd.fh", | |
262 | .cache_put = expkey_put, | |
263 | .cache_request = expkey_request, | |
264 | .cache_parse = expkey_parse, | |
265 | .cache_show = expkey_show, | |
266 | .match = expkey_match, | |
267 | .init = expkey_init, | |
268 | .update = expkey_update, | |
269 | .alloc = expkey_alloc, | |
270 | }; | |
271 | ||
272 | static struct svc_expkey * | |
273 | svc_expkey_lookup(struct svc_expkey *item) | |
274 | { | |
275 | struct cache_head *ch; | |
276 | int hash = item->ek_fsidtype; | |
277 | char * cp = (char*)item->ek_fsid; | |
278 | int len = key_len(item->ek_fsidtype); | |
279 | ||
280 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
281 | hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS); | |
282 | hash &= EXPKEY_HASHMASK; | |
283 | ||
284 | ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h, | |
285 | hash); | |
286 | if (ch) | |
287 | return container_of(ch, struct svc_expkey, h); | |
288 | else | |
289 | return NULL; | |
290 | } | |
291 | ||
292 | static struct svc_expkey * | |
293 | svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old) | |
294 | { | |
295 | struct cache_head *ch; | |
296 | int hash = new->ek_fsidtype; | |
297 | char * cp = (char*)new->ek_fsid; | |
298 | int len = key_len(new->ek_fsidtype); | |
299 | ||
300 | hash ^= hash_mem(cp, len, EXPKEY_HASHBITS); | |
301 | hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS); | |
302 | hash &= EXPKEY_HASHMASK; | |
303 | ||
304 | ch = sunrpc_cache_update(&svc_expkey_cache, &new->h, | |
305 | &old->h, hash); | |
306 | if (ch) | |
307 | return container_of(ch, struct svc_expkey, h); | |
308 | else | |
309 | return NULL; | |
310 | } | |
311 | ||
1da177e4 LT |
312 | |
313 | #define EXPORT_HASHBITS 8 | |
314 | #define EXPORT_HASHMAX (1<< EXPORT_HASHBITS) | |
315 | #define EXPORT_HASHMASK (EXPORT_HASHMAX -1) | |
316 | ||
317 | static struct cache_head *export_table[EXPORT_HASHMAX]; | |
318 | ||
93346919 MN |
319 | static void nfsd4_fslocs_free(struct nfsd4_fs_locations *fsloc) |
320 | { | |
321 | int i; | |
322 | ||
323 | for (i = 0; i < fsloc->locations_count; i++) { | |
324 | kfree(fsloc->locations[i].path); | |
325 | kfree(fsloc->locations[i].hosts); | |
326 | } | |
327 | kfree(fsloc->locations); | |
328 | } | |
329 | ||
baab935f | 330 | static void svc_export_put(struct kref *ref) |
1da177e4 | 331 | { |
baab935f N |
332 | struct svc_export *exp = container_of(ref, struct svc_export, h.ref); |
333 | dput(exp->ex_dentry); | |
334 | mntput(exp->ex_mnt); | |
335 | auth_domain_put(exp->ex_client); | |
b009a873 | 336 | kfree(exp->ex_path); |
93346919 | 337 | nfsd4_fslocs_free(&exp->ex_fslocs); |
baab935f | 338 | kfree(exp); |
1da177e4 LT |
339 | } |
340 | ||
341 | static void svc_export_request(struct cache_detail *cd, | |
342 | struct cache_head *h, | |
343 | char **bpp, int *blen) | |
344 | { | |
345 | /* client path */ | |
346 | struct svc_export *exp = container_of(h, struct svc_export, h); | |
347 | char *pth; | |
348 | ||
349 | qword_add(bpp, blen, exp->ex_client->name); | |
350 | pth = d_path(exp->ex_dentry, exp->ex_mnt, *bpp, *blen); | |
351 | if (IS_ERR(pth)) { | |
352 | /* is this correct? */ | |
353 | (*bpp)[0] = '\n'; | |
354 | return; | |
355 | } | |
356 | qword_add(bpp, blen, pth); | |
357 | (*bpp)[-1] = '\n'; | |
358 | } | |
359 | ||
74cae61a AB |
360 | static struct svc_export *svc_export_update(struct svc_export *new, |
361 | struct svc_export *old); | |
4f7774c3 | 362 | static struct svc_export *svc_export_lookup(struct svc_export *); |
1da177e4 | 363 | |
af6a4e28 | 364 | static int check_export(struct inode *inode, int flags, unsigned char *uuid) |
1da177e4 LT |
365 | { |
366 | ||
367 | /* We currently export only dirs and regular files. | |
368 | * This is what umountd does. | |
369 | */ | |
370 | if (!S_ISDIR(inode->i_mode) && | |
371 | !S_ISREG(inode->i_mode)) | |
372 | return -ENOTDIR; | |
373 | ||
374 | /* There are two requirements on a filesystem to be exportable. | |
375 | * 1: We must be able to identify the filesystem from a number. | |
376 | * either a device number (so FS_REQUIRES_DEV needed) | |
af6a4e28 | 377 | * or an FSID number (so NFSEXP_FSID or ->uuid is needed). |
1da177e4 LT |
378 | * 2: We must be able to find an inode from a filehandle. |
379 | * This means that s_export_op must be set. | |
380 | */ | |
381 | if (!(inode->i_sb->s_type->fs_flags & FS_REQUIRES_DEV) && | |
af6a4e28 N |
382 | !(flags & NFSEXP_FSID) && |
383 | uuid == NULL) { | |
3e3b4800 | 384 | dprintk("exp_export: export of non-dev fs without fsid\n"); |
1da177e4 LT |
385 | return -EINVAL; |
386 | } | |
387 | if (!inode->i_sb->s_export_op) { | |
388 | dprintk("exp_export: export of invalid fs type.\n"); | |
389 | return -EINVAL; | |
390 | } | |
391 | ||
392 | /* Ok, we can export it */; | |
393 | if (!inode->i_sb->s_export_op->find_exported_dentry) | |
394 | inode->i_sb->s_export_op->find_exported_dentry = | |
395 | find_exported_dentry; | |
396 | return 0; | |
397 | ||
398 | } | |
399 | ||
93346919 MN |
400 | #ifdef CONFIG_NFSD_V4 |
401 | ||
402 | static int | |
403 | fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) | |
404 | { | |
405 | int len; | |
406 | int migrated, i, err; | |
407 | ||
93346919 MN |
408 | /* listsize */ |
409 | err = get_int(mesg, &fsloc->locations_count); | |
410 | if (err) | |
411 | return err; | |
412 | if (fsloc->locations_count > MAX_FS_LOCATIONS) | |
413 | return -EINVAL; | |
414 | if (fsloc->locations_count == 0) | |
415 | return 0; | |
416 | ||
417 | fsloc->locations = kzalloc(fsloc->locations_count | |
418 | * sizeof(struct nfsd4_fs_location), GFP_KERNEL); | |
419 | if (!fsloc->locations) | |
420 | return -ENOMEM; | |
421 | for (i=0; i < fsloc->locations_count; i++) { | |
422 | /* colon separated host list */ | |
423 | err = -EINVAL; | |
424 | len = qword_get(mesg, buf, PAGE_SIZE); | |
425 | if (len <= 0) | |
426 | goto out_free_all; | |
427 | err = -ENOMEM; | |
428 | fsloc->locations[i].hosts = kstrdup(buf, GFP_KERNEL); | |
429 | if (!fsloc->locations[i].hosts) | |
430 | goto out_free_all; | |
431 | err = -EINVAL; | |
432 | /* slash separated path component list */ | |
433 | len = qword_get(mesg, buf, PAGE_SIZE); | |
434 | if (len <= 0) | |
435 | goto out_free_all; | |
436 | err = -ENOMEM; | |
437 | fsloc->locations[i].path = kstrdup(buf, GFP_KERNEL); | |
438 | if (!fsloc->locations[i].path) | |
439 | goto out_free_all; | |
440 | } | |
441 | /* migrated */ | |
442 | err = get_int(mesg, &migrated); | |
443 | if (err) | |
444 | goto out_free_all; | |
445 | err = -EINVAL; | |
446 | if (migrated < 0 || migrated > 1) | |
447 | goto out_free_all; | |
448 | fsloc->migrated = migrated; | |
449 | return 0; | |
450 | out_free_all: | |
451 | nfsd4_fslocs_free(fsloc); | |
452 | return err; | |
453 | } | |
454 | ||
455 | #else /* CONFIG_NFSD_V4 */ | |
456 | static inline int fsloc_parse(char **mesg, char *buf, struct nfsd4_fs_locations *fsloc) { return 0; } | |
457 | #endif | |
458 | ||
1da177e4 LT |
459 | static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen) |
460 | { | |
461 | /* client path expiry [flags anonuid anongid fsid] */ | |
462 | char *buf; | |
463 | int len; | |
464 | int err; | |
465 | struct auth_domain *dom = NULL; | |
466 | struct nameidata nd; | |
467 | struct svc_export exp, *expp; | |
468 | int an_int; | |
469 | ||
470 | nd.dentry = NULL; | |
b009a873 | 471 | exp.ex_path = NULL; |
1da177e4 | 472 | |
402acd29 N |
473 | /* fs locations */ |
474 | exp.ex_fslocs.locations = NULL; | |
475 | exp.ex_fslocs.locations_count = 0; | |
476 | exp.ex_fslocs.migrated = 0; | |
477 | ||
478 | exp.ex_uuid = NULL; | |
479 | ||
1da177e4 LT |
480 | if (mesg[mlen-1] != '\n') |
481 | return -EINVAL; | |
482 | mesg[mlen-1] = 0; | |
483 | ||
484 | buf = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
485 | err = -ENOMEM; | |
486 | if (!buf) goto out; | |
487 | ||
488 | /* client */ | |
489 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
490 | err = -EINVAL; | |
491 | if (len <= 0) goto out; | |
492 | ||
493 | err = -ENOENT; | |
494 | dom = auth_domain_find(buf); | |
495 | if (!dom) | |
496 | goto out; | |
497 | ||
498 | /* path */ | |
499 | err = -EINVAL; | |
500 | if ((len=qword_get(&mesg, buf, PAGE_SIZE)) <= 0) | |
501 | goto out; | |
502 | err = path_lookup(buf, 0, &nd); | |
cd156549 | 503 | if (err) goto out_no_path; |
1da177e4 LT |
504 | |
505 | exp.h.flags = 0; | |
506 | exp.ex_client = dom; | |
507 | exp.ex_mnt = nd.mnt; | |
508 | exp.ex_dentry = nd.dentry; | |
b009a873 BF |
509 | exp.ex_path = kstrdup(buf, GFP_KERNEL); |
510 | err = -ENOMEM; | |
511 | if (!exp.ex_path) | |
512 | goto out; | |
1da177e4 LT |
513 | |
514 | /* expiry */ | |
515 | err = -EINVAL; | |
516 | exp.h.expiry_time = get_expiry(&mesg); | |
517 | if (exp.h.expiry_time == 0) | |
518 | goto out; | |
519 | ||
520 | /* flags */ | |
521 | err = get_int(&mesg, &an_int); | |
522 | if (err == -ENOENT) | |
523 | set_bit(CACHE_NEGATIVE, &exp.h.flags); | |
524 | else { | |
525 | if (err || an_int < 0) goto out; | |
526 | exp.ex_flags= an_int; | |
527 | ||
528 | /* anon uid */ | |
529 | err = get_int(&mesg, &an_int); | |
530 | if (err) goto out; | |
531 | exp.ex_anon_uid= an_int; | |
532 | ||
533 | /* anon gid */ | |
534 | err = get_int(&mesg, &an_int); | |
535 | if (err) goto out; | |
536 | exp.ex_anon_gid= an_int; | |
537 | ||
538 | /* fsid */ | |
539 | err = get_int(&mesg, &an_int); | |
540 | if (err) goto out; | |
541 | exp.ex_fsid = an_int; | |
542 | ||
af6a4e28 N |
543 | while ((len = qword_get(&mesg, buf, PAGE_SIZE)) > 0) { |
544 | if (strcmp(buf, "fsloc") == 0) | |
545 | err = fsloc_parse(&mesg, buf, &exp.ex_fslocs); | |
546 | else if (strcmp(buf, "uuid") == 0) { | |
547 | /* expect a 16 byte uuid encoded as \xXXXX... */ | |
548 | len = qword_get(&mesg, buf, PAGE_SIZE); | |
549 | if (len != 16) | |
550 | err = -EINVAL; | |
551 | else { | |
552 | exp.ex_uuid = | |
553 | kmemdup(buf, 16, GFP_KERNEL); | |
554 | if (exp.ex_uuid == NULL) | |
555 | err = -ENOMEM; | |
556 | } | |
557 | } else | |
558 | /* quietly ignore unknown words and anything | |
559 | * following. Newer user-space can try to set | |
560 | * new values, then see what the result was. | |
561 | */ | |
562 | break; | |
563 | if (err) | |
564 | goto out; | |
565 | } | |
93346919 | 566 | |
af6a4e28 N |
567 | err = check_export(nd.dentry->d_inode, exp.ex_flags, |
568 | exp.ex_uuid); | |
569 | if (err) goto out; | |
1da177e4 LT |
570 | } |
571 | ||
4f7774c3 | 572 | expp = svc_export_lookup(&exp); |
1da177e4 | 573 | if (expp) |
4f7774c3 N |
574 | expp = svc_export_update(&exp, expp); |
575 | else | |
576 | err = -ENOMEM; | |
1da177e4 | 577 | cache_flush(); |
4f7774c3 N |
578 | if (expp == NULL) |
579 | err = -ENOMEM; | |
580 | else | |
581 | exp_put(expp); | |
1da177e4 | 582 | out: |
af6a4e28 N |
583 | nfsd4_fslocs_free(&exp.ex_fslocs); |
584 | kfree(exp.ex_uuid); | |
b009a873 | 585 | kfree(exp.ex_path); |
1da177e4 LT |
586 | if (nd.dentry) |
587 | path_release(&nd); | |
cd156549 | 588 | out_no_path: |
1da177e4 LT |
589 | if (dom) |
590 | auth_domain_put(dom); | |
f99d49ad | 591 | kfree(buf); |
1da177e4 LT |
592 | return err; |
593 | } | |
594 | ||
93346919 MN |
595 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
596 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fslocs); | |
1da177e4 LT |
597 | |
598 | static int svc_export_show(struct seq_file *m, | |
599 | struct cache_detail *cd, | |
600 | struct cache_head *h) | |
601 | { | |
602 | struct svc_export *exp ; | |
603 | ||
604 | if (h ==NULL) { | |
605 | seq_puts(m, "#path domain(flags)\n"); | |
606 | return 0; | |
607 | } | |
608 | exp = container_of(h, struct svc_export, h); | |
609 | seq_path(m, exp->ex_mnt, exp->ex_dentry, " \t\n\\"); | |
610 | seq_putc(m, '\t'); | |
611 | seq_escape(m, exp->ex_client->name, " \t\n\\"); | |
612 | seq_putc(m, '('); | |
613 | if (test_bit(CACHE_VALID, &h->flags) && | |
af6a4e28 | 614 | !test_bit(CACHE_NEGATIVE, &h->flags)) { |
93346919 MN |
615 | exp_flags(m, exp->ex_flags, exp->ex_fsid, |
616 | exp->ex_anon_uid, exp->ex_anon_gid, &exp->ex_fslocs); | |
af6a4e28 N |
617 | if (exp->ex_uuid) { |
618 | int i; | |
619 | seq_puts(m, ",uuid="); | |
620 | for (i=0; i<16; i++) { | |
621 | if ((i&3) == 0 && i) | |
622 | seq_putc(m, ':'); | |
623 | seq_printf(m, "%02x", exp->ex_uuid[i]); | |
624 | } | |
625 | } | |
626 | } | |
1da177e4 LT |
627 | seq_puts(m, ")\n"); |
628 | return 0; | |
629 | } | |
4f7774c3 | 630 | static int svc_export_match(struct cache_head *a, struct cache_head *b) |
1da177e4 | 631 | { |
4f7774c3 N |
632 | struct svc_export *orig = container_of(a, struct svc_export, h); |
633 | struct svc_export *new = container_of(b, struct svc_export, h); | |
634 | return orig->ex_client == new->ex_client && | |
635 | orig->ex_dentry == new->ex_dentry && | |
636 | orig->ex_mnt == new->ex_mnt; | |
1da177e4 | 637 | } |
4f7774c3 N |
638 | |
639 | static void svc_export_init(struct cache_head *cnew, struct cache_head *citem) | |
1da177e4 | 640 | { |
4f7774c3 N |
641 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
642 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
643 | ||
efc36aa5 | 644 | kref_get(&item->ex_client->ref); |
1da177e4 LT |
645 | new->ex_client = item->ex_client; |
646 | new->ex_dentry = dget(item->ex_dentry); | |
647 | new->ex_mnt = mntget(item->ex_mnt); | |
b009a873 | 648 | new->ex_path = NULL; |
93346919 MN |
649 | new->ex_fslocs.locations = NULL; |
650 | new->ex_fslocs.locations_count = 0; | |
651 | new->ex_fslocs.migrated = 0; | |
1da177e4 LT |
652 | } |
653 | ||
4f7774c3 | 654 | static void export_update(struct cache_head *cnew, struct cache_head *citem) |
1da177e4 | 655 | { |
4f7774c3 N |
656 | struct svc_export *new = container_of(cnew, struct svc_export, h); |
657 | struct svc_export *item = container_of(citem, struct svc_export, h); | |
658 | ||
1da177e4 LT |
659 | new->ex_flags = item->ex_flags; |
660 | new->ex_anon_uid = item->ex_anon_uid; | |
661 | new->ex_anon_gid = item->ex_anon_gid; | |
662 | new->ex_fsid = item->ex_fsid; | |
af6a4e28 N |
663 | new->ex_uuid = item->ex_uuid; |
664 | item->ex_uuid = NULL; | |
b009a873 BF |
665 | new->ex_path = item->ex_path; |
666 | item->ex_path = NULL; | |
93346919 MN |
667 | new->ex_fslocs.locations = item->ex_fslocs.locations; |
668 | item->ex_fslocs.locations = NULL; | |
669 | new->ex_fslocs.locations_count = item->ex_fslocs.locations_count; | |
670 | item->ex_fslocs.locations_count = 0; | |
671 | new->ex_fslocs.migrated = item->ex_fslocs.migrated; | |
672 | item->ex_fslocs.migrated = 0; | |
1da177e4 LT |
673 | } |
674 | ||
4f7774c3 N |
675 | static struct cache_head *svc_export_alloc(void) |
676 | { | |
677 | struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL); | |
678 | if (i) | |
679 | return &i->h; | |
680 | else | |
681 | return NULL; | |
682 | } | |
683 | ||
684 | struct cache_detail svc_export_cache = { | |
685 | .owner = THIS_MODULE, | |
686 | .hash_size = EXPORT_HASHMAX, | |
687 | .hash_table = export_table, | |
688 | .name = "nfsd.export", | |
689 | .cache_put = svc_export_put, | |
690 | .cache_request = svc_export_request, | |
691 | .cache_parse = svc_export_parse, | |
692 | .cache_show = svc_export_show, | |
693 | .match = svc_export_match, | |
694 | .init = svc_export_init, | |
695 | .update = export_update, | |
696 | .alloc = svc_export_alloc, | |
697 | }; | |
698 | ||
699 | static struct svc_export * | |
700 | svc_export_lookup(struct svc_export *exp) | |
701 | { | |
702 | struct cache_head *ch; | |
703 | int hash; | |
704 | hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS); | |
705 | hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS); | |
706 | hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS); | |
707 | ||
708 | ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h, | |
709 | hash); | |
710 | if (ch) | |
711 | return container_of(ch, struct svc_export, h); | |
712 | else | |
713 | return NULL; | |
714 | } | |
715 | ||
74cae61a | 716 | static struct svc_export * |
4f7774c3 N |
717 | svc_export_update(struct svc_export *new, struct svc_export *old) |
718 | { | |
719 | struct cache_head *ch; | |
720 | int hash; | |
721 | hash = hash_ptr(old->ex_client, EXPORT_HASHBITS); | |
722 | hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS); | |
723 | hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS); | |
724 | ||
725 | ch = sunrpc_cache_update(&svc_export_cache, &new->h, | |
726 | &old->h, | |
727 | hash); | |
728 | if (ch) | |
729 | return container_of(ch, struct svc_export, h); | |
730 | else | |
731 | return NULL; | |
732 | } | |
1da177e4 LT |
733 | |
734 | ||
74cae61a | 735 | static struct svc_expkey * |
1da177e4 LT |
736 | exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp) |
737 | { | |
738 | struct svc_expkey key, *ek; | |
739 | int err; | |
740 | ||
741 | if (!clp) | |
742 | return NULL; | |
743 | ||
744 | key.ek_client = clp; | |
745 | key.ek_fsidtype = fsid_type; | |
746 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
747 | ||
8d270f7f | 748 | ek = svc_expkey_lookup(&key); |
1da177e4 LT |
749 | if (ek != NULL) |
750 | if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp))) | |
751 | ek = ERR_PTR(err); | |
752 | return ek; | |
753 | } | |
754 | ||
755 | static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv, | |
756 | struct svc_export *exp) | |
757 | { | |
758 | struct svc_expkey key, *ek; | |
759 | ||
760 | key.ek_client = clp; | |
761 | key.ek_fsidtype = fsid_type; | |
762 | memcpy(key.ek_fsid, fsidv, key_len(fsid_type)); | |
eab7e2e6 N |
763 | key.ek_mnt = exp->ex_mnt; |
764 | key.ek_dentry = exp->ex_dentry; | |
1da177e4 LT |
765 | key.h.expiry_time = NEVER; |
766 | key.h.flags = 0; | |
767 | ||
8d270f7f N |
768 | ek = svc_expkey_lookup(&key); |
769 | if (ek) | |
770 | ek = svc_expkey_update(&key,ek); | |
1da177e4 | 771 | if (ek) { |
baab935f | 772 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
773 | return 0; |
774 | } | |
775 | return -ENOMEM; | |
776 | } | |
777 | ||
778 | /* | |
779 | * Find the client's export entry matching xdev/xino. | |
780 | */ | |
781 | static inline struct svc_expkey * | |
782 | exp_get_key(svc_client *clp, dev_t dev, ino_t ino) | |
783 | { | |
784 | u32 fsidv[3]; | |
785 | ||
786 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
787 | mk_fsid(FSID_DEV, fsidv, dev, ino, 0, NULL); |
788 | return exp_find_key(clp, FSID_DEV, fsidv, NULL); | |
1da177e4 | 789 | } |
af6a4e28 N |
790 | mk_fsid(FSID_ENCODE_DEV, fsidv, dev, ino, 0, NULL); |
791 | return exp_find_key(clp, FSID_ENCODE_DEV, fsidv, NULL); | |
1da177e4 LT |
792 | } |
793 | ||
794 | /* | |
795 | * Find the client's export entry matching fsid | |
796 | */ | |
797 | static inline struct svc_expkey * | |
798 | exp_get_fsid_key(svc_client *clp, int fsid) | |
799 | { | |
800 | u32 fsidv[2]; | |
801 | ||
af6a4e28 | 802 | mk_fsid(FSID_NUM, fsidv, 0, 0, fsid, NULL); |
1da177e4 | 803 | |
af6a4e28 | 804 | return exp_find_key(clp, FSID_NUM, fsidv, NULL); |
1da177e4 LT |
805 | } |
806 | ||
807 | svc_export * | |
808 | exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
809 | struct cache_req *reqp) | |
810 | { | |
811 | struct svc_export *exp, key; | |
812 | ||
813 | if (!clp) | |
814 | return NULL; | |
815 | ||
816 | key.ex_client = clp; | |
817 | key.ex_mnt = mnt; | |
818 | key.ex_dentry = dentry; | |
819 | ||
4f7774c3 | 820 | exp = svc_export_lookup(&key); |
e0bb89ef BF |
821 | if (exp != NULL) { |
822 | int err; | |
823 | ||
824 | err = cache_check(&svc_export_cache, &exp->h, reqp); | |
825 | switch (err) { | |
1da177e4 LT |
826 | case 0: break; |
827 | case -EAGAIN: | |
e0bb89ef BF |
828 | case -ETIMEDOUT: |
829 | exp = ERR_PTR(err); | |
1da177e4 LT |
830 | break; |
831 | default: | |
832 | exp = NULL; | |
833 | } | |
e0bb89ef | 834 | } |
1da177e4 LT |
835 | |
836 | return exp; | |
837 | } | |
838 | ||
839 | /* | |
840 | * Find the export entry for a given dentry. | |
841 | */ | |
842 | struct svc_export * | |
843 | exp_parent(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry, | |
844 | struct cache_req *reqp) | |
845 | { | |
846 | svc_export *exp; | |
847 | ||
848 | dget(dentry); | |
849 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
850 | ||
851 | while (exp == NULL && !IS_ROOT(dentry)) { | |
852 | struct dentry *parent; | |
853 | ||
854 | parent = dget_parent(dentry); | |
855 | dput(dentry); | |
856 | dentry = parent; | |
857 | exp = exp_get_by_name(clp, mnt, dentry, reqp); | |
858 | } | |
859 | dput(dentry); | |
860 | return exp; | |
861 | } | |
862 | ||
863 | /* | |
864 | * Hashtable locking. Write locks are placed only by user processes | |
865 | * wanting to modify export information. | |
866 | * Write locking only done in this file. Read locking | |
867 | * needed externally. | |
868 | */ | |
869 | ||
870 | static DECLARE_RWSEM(hash_sem); | |
871 | ||
872 | void | |
873 | exp_readlock(void) | |
874 | { | |
875 | down_read(&hash_sem); | |
876 | } | |
877 | ||
878 | static inline void | |
879 | exp_writelock(void) | |
880 | { | |
881 | down_write(&hash_sem); | |
882 | } | |
883 | ||
884 | void | |
885 | exp_readunlock(void) | |
886 | { | |
887 | up_read(&hash_sem); | |
888 | } | |
889 | ||
890 | static inline void | |
891 | exp_writeunlock(void) | |
892 | { | |
893 | up_write(&hash_sem); | |
894 | } | |
895 | ||
896 | static void exp_fsid_unhash(struct svc_export *exp) | |
897 | { | |
898 | struct svc_expkey *ek; | |
899 | ||
900 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
901 | return; | |
902 | ||
903 | ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid); | |
904 | if (ek && !IS_ERR(ek)) { | |
905 | ek->h.expiry_time = get_seconds()-1; | |
baab935f | 906 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
907 | } |
908 | svc_expkey_cache.nextcheck = get_seconds(); | |
909 | } | |
910 | ||
911 | static int exp_fsid_hash(svc_client *clp, struct svc_export *exp) | |
912 | { | |
913 | u32 fsid[2]; | |
914 | ||
915 | if ((exp->ex_flags & NFSEXP_FSID) == 0) | |
916 | return 0; | |
917 | ||
af6a4e28 N |
918 | mk_fsid(FSID_NUM, fsid, 0, 0, exp->ex_fsid, NULL); |
919 | return exp_set_key(clp, FSID_NUM, fsid, exp); | |
1da177e4 LT |
920 | } |
921 | ||
922 | static int exp_hash(struct auth_domain *clp, struct svc_export *exp) | |
923 | { | |
924 | u32 fsid[2]; | |
925 | struct inode *inode = exp->ex_dentry->d_inode; | |
926 | dev_t dev = inode->i_sb->s_dev; | |
927 | ||
928 | if (old_valid_dev(dev)) { | |
af6a4e28 N |
929 | mk_fsid(FSID_DEV, fsid, dev, inode->i_ino, 0, NULL); |
930 | return exp_set_key(clp, FSID_DEV, fsid, exp); | |
1da177e4 | 931 | } |
af6a4e28 N |
932 | mk_fsid(FSID_ENCODE_DEV, fsid, dev, inode->i_ino, 0, NULL); |
933 | return exp_set_key(clp, FSID_ENCODE_DEV, fsid, exp); | |
1da177e4 LT |
934 | } |
935 | ||
936 | static void exp_unhash(struct svc_export *exp) | |
937 | { | |
938 | struct svc_expkey *ek; | |
939 | struct inode *inode = exp->ex_dentry->d_inode; | |
940 | ||
941 | ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino); | |
942 | if (ek && !IS_ERR(ek)) { | |
943 | ek->h.expiry_time = get_seconds()-1; | |
baab935f | 944 | cache_put(&ek->h, &svc_expkey_cache); |
1da177e4 LT |
945 | } |
946 | svc_expkey_cache.nextcheck = get_seconds(); | |
947 | } | |
948 | ||
949 | /* | |
950 | * Export a file system. | |
951 | */ | |
952 | int | |
953 | exp_export(struct nfsctl_export *nxp) | |
954 | { | |
955 | svc_client *clp; | |
956 | struct svc_export *exp = NULL; | |
957 | struct svc_export new; | |
958 | struct svc_expkey *fsid_key = NULL; | |
959 | struct nameidata nd; | |
960 | int err; | |
961 | ||
962 | /* Consistency check */ | |
963 | err = -EINVAL; | |
964 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
965 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
966 | goto out; | |
967 | ||
968 | dprintk("exp_export called for %s:%s (%x/%ld fl %x).\n", | |
969 | nxp->ex_client, nxp->ex_path, | |
970 | (unsigned)nxp->ex_dev, (long)nxp->ex_ino, | |
971 | nxp->ex_flags); | |
972 | ||
973 | /* Try to lock the export table for update */ | |
974 | exp_writelock(); | |
975 | ||
976 | /* Look up client info */ | |
977 | if (!(clp = auth_domain_find(nxp->ex_client))) | |
978 | goto out_unlock; | |
979 | ||
980 | ||
981 | /* Look up the dentry */ | |
982 | err = path_lookup(nxp->ex_path, 0, &nd); | |
983 | if (err) | |
984 | goto out_unlock; | |
985 | err = -EINVAL; | |
986 | ||
987 | exp = exp_get_by_name(clp, nd.mnt, nd.dentry, NULL); | |
988 | ||
f988443a N |
989 | memset(&new, 0, sizeof(new)); |
990 | ||
1da177e4 LT |
991 | /* must make sure there won't be an ex_fsid clash */ |
992 | if ((nxp->ex_flags & NFSEXP_FSID) && | |
993 | (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) && | |
994 | !IS_ERR(fsid_key) && | |
eab7e2e6 N |
995 | fsid_key->ek_mnt && |
996 | (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) ) | |
1da177e4 LT |
997 | goto finish; |
998 | ||
999 | if (exp) { | |
1000 | /* just a flags/id/fsid update */ | |
1001 | ||
1002 | exp_fsid_unhash(exp); | |
1003 | exp->ex_flags = nxp->ex_flags; | |
1004 | exp->ex_anon_uid = nxp->ex_anon_uid; | |
1005 | exp->ex_anon_gid = nxp->ex_anon_gid; | |
1006 | exp->ex_fsid = nxp->ex_dev; | |
1007 | ||
1008 | err = exp_fsid_hash(clp, exp); | |
1009 | goto finish; | |
1010 | } | |
1011 | ||
af6a4e28 | 1012 | err = check_export(nd.dentry->d_inode, nxp->ex_flags, NULL); |
1da177e4 LT |
1013 | if (err) goto finish; |
1014 | ||
1015 | err = -ENOMEM; | |
1016 | ||
1017 | dprintk("nfsd: creating export entry %p for client %p\n", exp, clp); | |
1018 | ||
1019 | new.h.expiry_time = NEVER; | |
1020 | new.h.flags = 0; | |
f988443a N |
1021 | new.ex_path = kstrdup(nxp->ex_path, GFP_KERNEL); |
1022 | if (!new.ex_path) | |
1023 | goto finish; | |
1da177e4 LT |
1024 | new.ex_client = clp; |
1025 | new.ex_mnt = nd.mnt; | |
1026 | new.ex_dentry = nd.dentry; | |
1027 | new.ex_flags = nxp->ex_flags; | |
1028 | new.ex_anon_uid = nxp->ex_anon_uid; | |
1029 | new.ex_anon_gid = nxp->ex_anon_gid; | |
1030 | new.ex_fsid = nxp->ex_dev; | |
1031 | ||
4f7774c3 N |
1032 | exp = svc_export_lookup(&new); |
1033 | if (exp) | |
1034 | exp = svc_export_update(&new, exp); | |
1da177e4 | 1035 | |
4f7774c3 | 1036 | if (!exp) |
1da177e4 LT |
1037 | goto finish; |
1038 | ||
1da177e4 LT |
1039 | if (exp_hash(clp, exp) || |
1040 | exp_fsid_hash(clp, exp)) { | |
1041 | /* failed to create at least one index */ | |
1042 | exp_do_unexport(exp); | |
1043 | cache_flush(); | |
f988443a N |
1044 | } else |
1045 | err = 0; | |
1da177e4 | 1046 | finish: |
f988443a N |
1047 | if (new.ex_path) |
1048 | kfree(new.ex_path); | |
1da177e4 LT |
1049 | if (exp) |
1050 | exp_put(exp); | |
1051 | if (fsid_key && !IS_ERR(fsid_key)) | |
baab935f | 1052 | cache_put(&fsid_key->h, &svc_expkey_cache); |
1da177e4 LT |
1053 | if (clp) |
1054 | auth_domain_put(clp); | |
1055 | path_release(&nd); | |
1056 | out_unlock: | |
1057 | exp_writeunlock(); | |
1058 | out: | |
1059 | return err; | |
1060 | } | |
1061 | ||
1062 | /* | |
1063 | * Unexport a file system. The export entry has already | |
1064 | * been removed from the client's list of exported fs's. | |
1065 | */ | |
1066 | static void | |
1067 | exp_do_unexport(svc_export *unexp) | |
1068 | { | |
1069 | unexp->h.expiry_time = get_seconds()-1; | |
1070 | svc_export_cache.nextcheck = get_seconds(); | |
1071 | exp_unhash(unexp); | |
1072 | exp_fsid_unhash(unexp); | |
1073 | } | |
1074 | ||
1075 | ||
1076 | /* | |
1077 | * unexport syscall. | |
1078 | */ | |
1079 | int | |
1080 | exp_unexport(struct nfsctl_export *nxp) | |
1081 | { | |
1082 | struct auth_domain *dom; | |
1083 | svc_export *exp; | |
1084 | struct nameidata nd; | |
1085 | int err; | |
1086 | ||
1087 | /* Consistency check */ | |
1088 | if (!exp_verify_string(nxp->ex_path, NFS_MAXPATHLEN) || | |
1089 | !exp_verify_string(nxp->ex_client, NFSCLNT_IDMAX)) | |
1090 | return -EINVAL; | |
1091 | ||
1092 | exp_writelock(); | |
1093 | ||
1094 | err = -EINVAL; | |
1095 | dom = auth_domain_find(nxp->ex_client); | |
1096 | if (!dom) { | |
1097 | dprintk("nfsd: unexport couldn't find %s\n", nxp->ex_client); | |
1098 | goto out_unlock; | |
1099 | } | |
1100 | ||
1101 | err = path_lookup(nxp->ex_path, 0, &nd); | |
1102 | if (err) | |
1103 | goto out_domain; | |
1104 | ||
1105 | err = -EINVAL; | |
1106 | exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL); | |
1107 | path_release(&nd); | |
1108 | if (!exp) | |
1109 | goto out_domain; | |
1110 | ||
1111 | exp_do_unexport(exp); | |
1112 | exp_put(exp); | |
1113 | err = 0; | |
1114 | ||
1115 | out_domain: | |
1116 | auth_domain_put(dom); | |
1117 | cache_flush(); | |
1118 | out_unlock: | |
1119 | exp_writeunlock(); | |
1120 | return err; | |
1121 | } | |
1122 | ||
1123 | /* | |
1124 | * Obtain the root fh on behalf of a client. | |
1125 | * This could be done in user space, but I feel that it adds some safety | |
1126 | * since its harder to fool a kernel module than a user space program. | |
1127 | */ | |
1128 | int | |
1129 | exp_rootfh(svc_client *clp, char *path, struct knfsd_fh *f, int maxsize) | |
1130 | { | |
1131 | struct svc_export *exp; | |
1132 | struct nameidata nd; | |
1133 | struct inode *inode; | |
1134 | struct svc_fh fh; | |
1135 | int err; | |
1136 | ||
1137 | err = -EPERM; | |
1138 | /* NB: we probably ought to check that it's NUL-terminated */ | |
1139 | if (path_lookup(path, 0, &nd)) { | |
1140 | printk("nfsd: exp_rootfh path not found %s", path); | |
1141 | return err; | |
1142 | } | |
1143 | inode = nd.dentry->d_inode; | |
1144 | ||
1145 | dprintk("nfsd: exp_rootfh(%s [%p] %s:%s/%ld)\n", | |
1146 | path, nd.dentry, clp->name, | |
1147 | inode->i_sb->s_id, inode->i_ino); | |
1148 | exp = exp_parent(clp, nd.mnt, nd.dentry, NULL); | |
4b41bd85 BF |
1149 | if (IS_ERR(exp)) { |
1150 | err = PTR_ERR(exp); | |
1151 | goto out; | |
1152 | } | |
1da177e4 LT |
1153 | if (!exp) { |
1154 | dprintk("nfsd: exp_rootfh export not found.\n"); | |
1155 | goto out; | |
1156 | } | |
1157 | ||
1158 | /* | |
1159 | * fh must be initialized before calling fh_compose | |
1160 | */ | |
1161 | fh_init(&fh, maxsize); | |
1162 | if (fh_compose(&fh, exp, nd.dentry, NULL)) | |
1163 | err = -EINVAL; | |
1164 | else | |
1165 | err = 0; | |
1166 | memcpy(f, &fh.fh_handle, sizeof(struct knfsd_fh)); | |
1167 | fh_put(&fh); | |
1168 | exp_put(exp); | |
1169 | out: | |
1170 | path_release(&nd); | |
1171 | return err; | |
1172 | } | |
1173 | ||
eab7e2e6 N |
1174 | struct svc_export * |
1175 | exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv, | |
1176 | struct cache_req *reqp) | |
1177 | { | |
1178 | struct svc_export *exp; | |
1179 | struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp); | |
1180 | if (!ek || IS_ERR(ek)) | |
1181 | return ERR_PTR(PTR_ERR(ek)); | |
1182 | ||
1183 | exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp); | |
baab935f | 1184 | cache_put(&ek->h, &svc_expkey_cache); |
eab7e2e6 N |
1185 | |
1186 | if (!exp || IS_ERR(exp)) | |
1187 | return ERR_PTR(PTR_ERR(exp)); | |
1188 | return exp; | |
1189 | } | |
1190 | ||
1191 | ||
1da177e4 LT |
1192 | /* |
1193 | * Called when we need the filehandle for the root of the pseudofs, | |
1194 | * for a given NFSv4 client. The root is defined to be the | |
1195 | * export point with fsid==0 | |
1196 | */ | |
c7afef1f | 1197 | __be32 |
1da177e4 LT |
1198 | exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp, |
1199 | struct cache_req *creq) | |
1200 | { | |
eab7e2e6 | 1201 | struct svc_export *exp; |
c7afef1f | 1202 | __be32 rv; |
1da177e4 LT |
1203 | u32 fsidv[2]; |
1204 | ||
af6a4e28 | 1205 | mk_fsid(FSID_NUM, fsidv, 0, 0, 0, NULL); |
1da177e4 | 1206 | |
af6a4e28 | 1207 | exp = exp_find(clp, FSID_NUM, fsidv, creq); |
6899320c BF |
1208 | if (IS_ERR(exp)) |
1209 | return nfserrno(PTR_ERR(exp)); | |
eab7e2e6 | 1210 | if (exp == NULL) |
d0ebd9c0 | 1211 | return nfserr_perm; |
d0ebd9c0 BF |
1212 | rv = fh_compose(fhp, exp, exp->ex_dentry, NULL); |
1213 | exp_put(exp); | |
1da177e4 LT |
1214 | return rv; |
1215 | } | |
1216 | ||
1217 | /* Iterator */ | |
1218 | ||
1219 | static void *e_start(struct seq_file *m, loff_t *pos) | |
896440d5 | 1220 | __acquires(svc_export_cache.hash_lock) |
1da177e4 LT |
1221 | { |
1222 | loff_t n = *pos; | |
1223 | unsigned hash, export; | |
1224 | struct cache_head *ch; | |
1225 | ||
1226 | exp_readlock(); | |
1227 | read_lock(&svc_export_cache.hash_lock); | |
1228 | if (!n--) | |
bc6f02e5 | 1229 | return SEQ_START_TOKEN; |
1da177e4 LT |
1230 | hash = n >> 32; |
1231 | export = n & ((1LL<<32) - 1); | |
1232 | ||
1233 | ||
1234 | for (ch=export_table[hash]; ch; ch=ch->next) | |
1235 | if (!export--) | |
1236 | return ch; | |
1237 | n &= ~((1LL<<32) - 1); | |
1238 | do { | |
1239 | hash++; | |
1240 | n += 1LL<<32; | |
1241 | } while(hash < EXPORT_HASHMAX && export_table[hash]==NULL); | |
1242 | if (hash >= EXPORT_HASHMAX) | |
1243 | return NULL; | |
1244 | *pos = n+1; | |
1245 | return export_table[hash]; | |
1246 | } | |
1247 | ||
1248 | static void *e_next(struct seq_file *m, void *p, loff_t *pos) | |
1249 | { | |
1250 | struct cache_head *ch = p; | |
1251 | int hash = (*pos >> 32); | |
1252 | ||
bc6f02e5 | 1253 | if (p == SEQ_START_TOKEN) |
1da177e4 LT |
1254 | hash = 0; |
1255 | else if (ch->next == NULL) { | |
1256 | hash++; | |
1257 | *pos += 1LL<<32; | |
1258 | } else { | |
1259 | ++*pos; | |
1260 | return ch->next; | |
1261 | } | |
1262 | *pos &= ~((1LL<<32) - 1); | |
1263 | while (hash < EXPORT_HASHMAX && export_table[hash] == NULL) { | |
1264 | hash++; | |
1265 | *pos += 1LL<<32; | |
1266 | } | |
1267 | if (hash >= EXPORT_HASHMAX) | |
1268 | return NULL; | |
1269 | ++*pos; | |
1270 | return export_table[hash]; | |
1271 | } | |
1272 | ||
1273 | static void e_stop(struct seq_file *m, void *p) | |
896440d5 | 1274 | __releases(svc_export_cache.hash_lock) |
1da177e4 LT |
1275 | { |
1276 | read_unlock(&svc_export_cache.hash_lock); | |
1277 | exp_readunlock(); | |
1278 | } | |
1279 | ||
1280 | static struct flags { | |
1281 | int flag; | |
1282 | char *name[2]; | |
1283 | } expflags[] = { | |
1284 | { NFSEXP_READONLY, {"ro", "rw"}}, | |
1285 | { NFSEXP_INSECURE_PORT, {"insecure", ""}}, | |
1286 | { NFSEXP_ROOTSQUASH, {"root_squash", "no_root_squash"}}, | |
1287 | { NFSEXP_ALLSQUASH, {"all_squash", ""}}, | |
1288 | { NFSEXP_ASYNC, {"async", "sync"}}, | |
1289 | { NFSEXP_GATHERED_WRITES, {"wdelay", "no_wdelay"}}, | |
1290 | { NFSEXP_NOHIDE, {"nohide", ""}}, | |
1291 | { NFSEXP_CROSSMOUNT, {"crossmnt", ""}}, | |
1292 | { NFSEXP_NOSUBTREECHECK, {"no_subtree_check", ""}}, | |
1293 | { NFSEXP_NOAUTHNLM, {"insecure_locks", ""}}, | |
1294 | #ifdef MSNFS | |
1295 | { NFSEXP_MSNFS, {"msnfs", ""}}, | |
1296 | #endif | |
1297 | { 0, {"", ""}} | |
1298 | }; | |
1299 | ||
93346919 MN |
1300 | static void exp_flags(struct seq_file *m, int flag, int fsid, |
1301 | uid_t anonu, uid_t anong, struct nfsd4_fs_locations *fsloc) | |
1da177e4 LT |
1302 | { |
1303 | int first = 0; | |
1304 | struct flags *flg; | |
1305 | ||
1306 | for (flg = expflags; flg->flag; flg++) { | |
1307 | int state = (flg->flag & flag)?0:1; | |
1308 | if (*flg->name[state]) | |
1309 | seq_printf(m, "%s%s", first++?",":"", flg->name[state]); | |
1310 | } | |
1311 | if (flag & NFSEXP_FSID) | |
1312 | seq_printf(m, "%sfsid=%d", first++?",":"", fsid); | |
1313 | if (anonu != (uid_t)-2 && anonu != (0x10000-2)) | |
1314 | seq_printf(m, "%sanonuid=%d", first++?",":"", anonu); | |
1315 | if (anong != (gid_t)-2 && anong != (0x10000-2)) | |
1316 | seq_printf(m, "%sanongid=%d", first++?",":"", anong); | |
93346919 MN |
1317 | if (fsloc && fsloc->locations_count > 0) { |
1318 | char *loctype = (fsloc->migrated) ? "refer" : "replicas"; | |
1319 | int i; | |
1320 | ||
1321 | seq_printf(m, "%s%s=", first++?",":"", loctype); | |
1322 | seq_escape(m, fsloc->locations[0].path, ",;@ \t\n\\"); | |
1323 | seq_putc(m, '@'); | |
1324 | seq_escape(m, fsloc->locations[0].hosts, ",;@ \t\n\\"); | |
1325 | for (i = 1; i < fsloc->locations_count; i++) { | |
1326 | seq_putc(m, ';'); | |
1327 | seq_escape(m, fsloc->locations[i].path, ",;@ \t\n\\"); | |
1328 | seq_putc(m, '@'); | |
1329 | seq_escape(m, fsloc->locations[i].hosts, ",;@ \t\n\\"); | |
1330 | } | |
1331 | } | |
1da177e4 LT |
1332 | } |
1333 | ||
1334 | static int e_show(struct seq_file *m, void *p) | |
1335 | { | |
1336 | struct cache_head *cp = p; | |
1337 | struct svc_export *exp = container_of(cp, struct svc_export, h); | |
1da177e4 | 1338 | |
bc6f02e5 | 1339 | if (p == SEQ_START_TOKEN) { |
1da177e4 LT |
1340 | seq_puts(m, "# Version 1.1\n"); |
1341 | seq_puts(m, "# Path Client(Flags) # IPs\n"); | |
1342 | return 0; | |
1343 | } | |
1344 | ||
1da177e4 LT |
1345 | cache_get(&exp->h); |
1346 | if (cache_check(&svc_export_cache, &exp->h, NULL)) | |
1347 | return 0; | |
baab935f | 1348 | cache_put(&exp->h, &svc_export_cache); |
1da177e4 LT |
1349 | return svc_export_show(m, &svc_export_cache, cp); |
1350 | } | |
1351 | ||
1352 | struct seq_operations nfs_exports_op = { | |
1353 | .start = e_start, | |
1354 | .next = e_next, | |
1355 | .stop = e_stop, | |
1356 | .show = e_show, | |
1357 | }; | |
1358 | ||
1359 | /* | |
1360 | * Add or modify a client. | |
1361 | * Change requests may involve the list of host addresses. The list of | |
1362 | * exports and possibly existing uid maps are left untouched. | |
1363 | */ | |
1364 | int | |
1365 | exp_addclient(struct nfsctl_client *ncp) | |
1366 | { | |
1367 | struct auth_domain *dom; | |
1368 | int i, err; | |
1369 | ||
1370 | /* First, consistency check. */ | |
1371 | err = -EINVAL; | |
1372 | if (! exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1373 | goto out; | |
1374 | if (ncp->cl_naddr > NFSCLNT_ADDRMAX) | |
1375 | goto out; | |
1376 | ||
1377 | /* Lock the hashtable */ | |
1378 | exp_writelock(); | |
1379 | ||
1380 | dom = unix_domain_find(ncp->cl_ident); | |
1381 | ||
1382 | err = -ENOMEM; | |
1383 | if (!dom) | |
1384 | goto out_unlock; | |
1385 | ||
1386 | /* Insert client into hashtable. */ | |
1387 | for (i = 0; i < ncp->cl_naddr; i++) | |
1388 | auth_unix_add_addr(ncp->cl_addrlist[i], dom); | |
1389 | ||
1390 | auth_unix_forget_old(dom); | |
1391 | auth_domain_put(dom); | |
1392 | ||
1393 | err = 0; | |
1394 | ||
1395 | out_unlock: | |
1396 | exp_writeunlock(); | |
1397 | out: | |
1398 | return err; | |
1399 | } | |
1400 | ||
1401 | /* | |
1402 | * Delete a client given an identifier. | |
1403 | */ | |
1404 | int | |
1405 | exp_delclient(struct nfsctl_client *ncp) | |
1406 | { | |
1407 | int err; | |
1408 | struct auth_domain *dom; | |
1409 | ||
1410 | err = -EINVAL; | |
1411 | if (!exp_verify_string(ncp->cl_ident, NFSCLNT_IDMAX)) | |
1412 | goto out; | |
1413 | ||
1414 | /* Lock the hashtable */ | |
1415 | exp_writelock(); | |
1416 | ||
1417 | dom = auth_domain_find(ncp->cl_ident); | |
1418 | /* just make sure that no addresses work | |
1419 | * and that it will expire soon | |
1420 | */ | |
1421 | if (dom) { | |
1422 | err = auth_unix_forget_old(dom); | |
1da177e4 LT |
1423 | auth_domain_put(dom); |
1424 | } | |
1425 | ||
1426 | exp_writeunlock(); | |
1427 | out: | |
1428 | return err; | |
1429 | } | |
1430 | ||
1431 | /* | |
1432 | * Verify that string is non-empty and does not exceed max length. | |
1433 | */ | |
1434 | static int | |
1435 | exp_verify_string(char *cp, int max) | |
1436 | { | |
1437 | int i; | |
1438 | ||
1439 | for (i = 0; i < max; i++) | |
1440 | if (!cp[i]) | |
1441 | return i; | |
1442 | cp[i] = 0; | |
1443 | printk(KERN_NOTICE "nfsd: couldn't validate string %s\n", cp); | |
1444 | return 0; | |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * Initialize the exports module. | |
1449 | */ | |
1450 | void | |
1451 | nfsd_export_init(void) | |
1452 | { | |
1453 | dprintk("nfsd: initializing export module.\n"); | |
1454 | ||
1455 | cache_register(&svc_export_cache); | |
1456 | cache_register(&svc_expkey_cache); | |
1457 | ||
1458 | } | |
1459 | ||
1460 | /* | |
1461 | * Flush exports table - called when last nfsd thread is killed | |
1462 | */ | |
1463 | void | |
1464 | nfsd_export_flush(void) | |
1465 | { | |
1466 | exp_writelock(); | |
1467 | cache_purge(&svc_expkey_cache); | |
1468 | cache_purge(&svc_export_cache); | |
1469 | exp_writeunlock(); | |
1470 | } | |
1471 | ||
1472 | /* | |
1473 | * Shutdown the exports module. | |
1474 | */ | |
1475 | void | |
1476 | nfsd_export_shutdown(void) | |
1477 | { | |
1478 | ||
1479 | dprintk("nfsd: shutting down export module.\n"); | |
1480 | ||
1481 | exp_writelock(); | |
1482 | ||
1483 | if (cache_unregister(&svc_expkey_cache)) | |
1484 | printk(KERN_ERR "nfsd: failed to unregister expkey cache\n"); | |
1485 | if (cache_unregister(&svc_export_cache)) | |
1486 | printk(KERN_ERR "nfsd: failed to unregister export cache\n"); | |
1487 | svcauth_unix_purge(); | |
1488 | ||
1489 | exp_writeunlock(); | |
1490 | dprintk("nfsd: export shutdown complete.\n"); | |
1491 | } |