Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * fs/nfsd/nfs4idmap.c | |
3 | * | |
4 | * Mapping of UID/GIDs to name and vice versa. | |
5 | * | |
6 | * Copyright (c) 2002, 2003 The Regents of the University of | |
7 | * Michigan. All rights reserved. | |
8 | * | |
9 | * Marius Aamodt Eriksen <marius@umich.edu> | |
10 | * | |
11 | * Redistribution and use in source and binary forms, with or without | |
12 | * modification, are permitted provided that the following conditions | |
13 | * are met: | |
14 | * | |
15 | * 1. Redistributions of source code must retain the above copyright | |
16 | * notice, this list of conditions and the following disclaimer. | |
17 | * 2. Redistributions in binary form must reproduce the above copyright | |
18 | * notice, this list of conditions and the following disclaimer in the | |
19 | * documentation and/or other materials provided with the distribution. | |
20 | * 3. Neither the name of the University nor the names of its | |
21 | * contributors may be used to endorse or promote products derived | |
22 | * from this software without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED | |
25 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | |
26 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
27 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR | |
29 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF | |
30 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR | |
31 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF | |
32 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING | |
33 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS | |
34 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #include <linux/config.h> | |
38 | #include <linux/module.h> | |
39 | #include <linux/init.h> | |
40 | ||
41 | #include <linux/mm.h> | |
42 | #include <linux/utsname.h> | |
43 | #include <linux/errno.h> | |
44 | #include <linux/string.h> | |
45 | #include <linux/sunrpc/clnt.h> | |
46 | #include <linux/nfs.h> | |
47 | #include <linux/nfs4.h> | |
48 | #include <linux/nfs_fs.h> | |
49 | #include <linux/nfs_page.h> | |
50 | #include <linux/smp_lock.h> | |
51 | #include <linux/sunrpc/cache.h> | |
52 | #include <linux/nfsd_idmap.h> | |
53 | #include <linux/list.h> | |
54 | #include <linux/sched.h> | |
55 | #include <linux/time.h> | |
56 | #include <linux/seq_file.h> | |
57 | #include <linux/sunrpc/svcauth.h> | |
58 | ||
59 | /* | |
60 | * Cache entry | |
61 | */ | |
62 | ||
63 | /* | |
64 | * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on | |
65 | * that. | |
66 | */ | |
67 | ||
68 | #define IDMAP_TYPE_USER 0 | |
69 | #define IDMAP_TYPE_GROUP 1 | |
70 | ||
71 | struct ent { | |
72 | struct cache_head h; | |
73 | int type; /* User / Group */ | |
74 | uid_t id; | |
75 | char name[IDMAP_NAMESZ]; | |
76 | char authname[IDMAP_NAMESZ]; | |
77 | }; | |
78 | ||
1da177e4 LT |
79 | /* Common entry handling */ |
80 | ||
81 | #define ENT_HASHBITS 8 | |
82 | #define ENT_HASHMAX (1 << ENT_HASHBITS) | |
83 | #define ENT_HASHMASK (ENT_HASHMAX - 1) | |
84 | ||
f9ecc921 N |
85 | static void |
86 | ent_init(struct cache_head *cnew, struct cache_head *citm) | |
1da177e4 | 87 | { |
f9ecc921 N |
88 | struct ent *new = container_of(cnew, struct ent, h); |
89 | struct ent *itm = container_of(citm, struct ent, h); | |
90 | ||
1da177e4 LT |
91 | new->id = itm->id; |
92 | new->type = itm->type; | |
93 | ||
94 | strlcpy(new->name, itm->name, sizeof(new->name)); | |
95 | strlcpy(new->authname, itm->authname, sizeof(new->name)); | |
96 | } | |
97 | ||
fd39ca9a | 98 | static void |
baab935f | 99 | ent_put(struct kref *ref) |
1da177e4 | 100 | { |
baab935f N |
101 | struct ent *map = container_of(ref, struct ent, h.ref); |
102 | kfree(map); | |
1da177e4 LT |
103 | } |
104 | ||
f9ecc921 N |
105 | static struct cache_head * |
106 | ent_alloc(void) | |
107 | { | |
108 | struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL); | |
109 | if (e) | |
110 | return &e->h; | |
111 | else | |
112 | return NULL; | |
113 | } | |
114 | ||
1da177e4 LT |
115 | /* |
116 | * ID -> Name cache | |
117 | */ | |
118 | ||
119 | static struct cache_head *idtoname_table[ENT_HASHMAX]; | |
120 | ||
121 | static uint32_t | |
122 | idtoname_hash(struct ent *ent) | |
123 | { | |
124 | uint32_t hash; | |
125 | ||
126 | hash = hash_str(ent->authname, ENT_HASHBITS); | |
127 | hash = hash_long(hash ^ ent->id, ENT_HASHBITS); | |
128 | ||
129 | /* Flip LSB for user/group */ | |
130 | if (ent->type == IDMAP_TYPE_GROUP) | |
131 | hash ^= 1; | |
132 | ||
133 | return hash; | |
134 | } | |
135 | ||
136 | static void | |
137 | idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, | |
138 | int *blen) | |
139 | { | |
140 | struct ent *ent = container_of(ch, struct ent, h); | |
141 | char idstr[11]; | |
142 | ||
143 | qword_add(bpp, blen, ent->authname); | |
144 | snprintf(idstr, sizeof(idstr), "%d", ent->id); | |
145 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); | |
146 | qword_add(bpp, blen, idstr); | |
147 | ||
148 | (*bpp)[-1] = '\n'; | |
149 | } | |
150 | ||
f9ecc921 N |
151 | static int |
152 | idtoname_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 153 | { |
f9ecc921 N |
154 | struct ent *a = container_of(ca, struct ent, h); |
155 | struct ent *b = container_of(cb, struct ent, h); | |
156 | ||
1da177e4 LT |
157 | return (a->id == b->id && a->type == b->type && |
158 | strcmp(a->authname, b->authname) == 0); | |
159 | } | |
160 | ||
161 | static int | |
162 | idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
163 | { | |
164 | struct ent *ent; | |
165 | ||
166 | if (h == NULL) { | |
167 | seq_puts(m, "#domain type id [name]\n"); | |
168 | return 0; | |
169 | } | |
170 | ent = container_of(h, struct ent, h); | |
171 | seq_printf(m, "%s %s %d", ent->authname, | |
172 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", | |
173 | ent->id); | |
174 | if (test_bit(CACHE_VALID, &h->flags)) | |
175 | seq_printf(m, " %s", ent->name); | |
176 | seq_printf(m, "\n"); | |
177 | return 0; | |
178 | } | |
179 | ||
180 | static void | |
181 | warn_no_idmapd(struct cache_detail *detail) | |
182 | { | |
183 | printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", | |
184 | detail->last_close? "died" : "not been started"); | |
185 | } | |
186 | ||
187 | ||
188 | static int idtoname_parse(struct cache_detail *, char *, int); | |
f9ecc921 N |
189 | static struct ent *idtoname_lookup(struct ent *); |
190 | static struct ent *idtoname_update(struct ent *, struct ent *); | |
1da177e4 | 191 | |
fd39ca9a | 192 | static struct cache_detail idtoname_cache = { |
f35279d3 | 193 | .owner = THIS_MODULE, |
1da177e4 LT |
194 | .hash_size = ENT_HASHMAX, |
195 | .hash_table = idtoname_table, | |
196 | .name = "nfs4.idtoname", | |
197 | .cache_put = ent_put, | |
198 | .cache_request = idtoname_request, | |
199 | .cache_parse = idtoname_parse, | |
200 | .cache_show = idtoname_show, | |
201 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
202 | .match = idtoname_match, |
203 | .init = ent_init, | |
204 | .update = ent_init, | |
205 | .alloc = ent_alloc, | |
1da177e4 LT |
206 | }; |
207 | ||
208 | int | |
209 | idtoname_parse(struct cache_detail *cd, char *buf, int buflen) | |
210 | { | |
211 | struct ent ent, *res; | |
212 | char *buf1, *bp; | |
213 | int error = -EINVAL; | |
214 | ||
215 | if (buf[buflen - 1] != '\n') | |
216 | return (-EINVAL); | |
217 | buf[buflen - 1]= '\0'; | |
218 | ||
219 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
220 | if (buf1 == NULL) | |
221 | return (-ENOMEM); | |
222 | ||
223 | memset(&ent, 0, sizeof(ent)); | |
224 | ||
225 | /* Authentication name */ | |
226 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
227 | goto out; | |
228 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
229 | ||
230 | /* Type */ | |
231 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
232 | goto out; | |
233 | ent.type = strcmp(buf1, "user") == 0 ? | |
234 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
235 | ||
236 | /* ID */ | |
237 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
238 | goto out; | |
239 | ent.id = simple_strtoul(buf1, &bp, 10); | |
240 | if (bp == buf1) | |
241 | goto out; | |
242 | ||
243 | /* expiry */ | |
244 | ent.h.expiry_time = get_expiry(&buf); | |
245 | if (ent.h.expiry_time == 0) | |
246 | goto out; | |
247 | ||
f9ecc921 N |
248 | error = -ENOMEM; |
249 | res = idtoname_lookup(&ent); | |
250 | if (!res) | |
251 | goto out; | |
252 | ||
1da177e4 LT |
253 | /* Name */ |
254 | error = qword_get(&buf, buf1, PAGE_SIZE); | |
255 | if (error == -EINVAL) | |
256 | goto out; | |
257 | if (error == -ENOENT) | |
258 | set_bit(CACHE_NEGATIVE, &ent.h.flags); | |
259 | else { | |
260 | if (error >= IDMAP_NAMESZ) { | |
261 | error = -EINVAL; | |
262 | goto out; | |
263 | } | |
264 | memcpy(ent.name, buf1, sizeof(ent.name)); | |
265 | } | |
266 | error = -ENOMEM; | |
f9ecc921 N |
267 | res = idtoname_update(&ent, res); |
268 | if (res == NULL) | |
1da177e4 LT |
269 | goto out; |
270 | ||
baab935f | 271 | cache_put(&res->h, &idtoname_cache); |
1da177e4 LT |
272 | |
273 | error = 0; | |
274 | out: | |
275 | kfree(buf1); | |
276 | ||
277 | return error; | |
278 | } | |
279 | ||
f9ecc921 N |
280 | |
281 | static struct ent * | |
282 | idtoname_lookup(struct ent *item) | |
283 | { | |
284 | struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache, | |
285 | &item->h, | |
286 | idtoname_hash(item)); | |
287 | if (ch) | |
288 | return container_of(ch, struct ent, h); | |
289 | else | |
290 | return NULL; | |
291 | } | |
292 | ||
293 | static struct ent * | |
294 | idtoname_update(struct ent *new, struct ent *old) | |
295 | { | |
296 | struct cache_head *ch = sunrpc_cache_update(&idtoname_cache, | |
297 | &new->h, &old->h, | |
298 | idtoname_hash(new)); | |
299 | if (ch) | |
300 | return container_of(ch, struct ent, h); | |
301 | else | |
302 | return NULL; | |
303 | } | |
304 | ||
1da177e4 LT |
305 | |
306 | /* | |
307 | * Name -> ID cache | |
308 | */ | |
309 | ||
310 | static struct cache_head *nametoid_table[ENT_HASHMAX]; | |
311 | ||
312 | static inline int | |
313 | nametoid_hash(struct ent *ent) | |
314 | { | |
315 | return hash_str(ent->name, ENT_HASHBITS); | |
316 | } | |
317 | ||
fd39ca9a | 318 | static void |
1da177e4 LT |
319 | nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
320 | int *blen) | |
321 | { | |
322 | struct ent *ent = container_of(ch, struct ent, h); | |
323 | ||
324 | qword_add(bpp, blen, ent->authname); | |
325 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); | |
326 | qword_add(bpp, blen, ent->name); | |
327 | ||
328 | (*bpp)[-1] = '\n'; | |
329 | } | |
330 | ||
f9ecc921 N |
331 | static int |
332 | nametoid_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 333 | { |
f9ecc921 N |
334 | struct ent *a = container_of(ca, struct ent, h); |
335 | struct ent *b = container_of(cb, struct ent, h); | |
336 | ||
1da177e4 LT |
337 | return (a->type == b->type && strcmp(a->name, b->name) == 0 && |
338 | strcmp(a->authname, b->authname) == 0); | |
339 | } | |
340 | ||
341 | static int | |
342 | nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
343 | { | |
344 | struct ent *ent; | |
345 | ||
346 | if (h == NULL) { | |
347 | seq_puts(m, "#domain type name [id]\n"); | |
348 | return 0; | |
349 | } | |
350 | ent = container_of(h, struct ent, h); | |
351 | seq_printf(m, "%s %s %s", ent->authname, | |
352 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", | |
353 | ent->name); | |
354 | if (test_bit(CACHE_VALID, &h->flags)) | |
355 | seq_printf(m, " %d", ent->id); | |
356 | seq_printf(m, "\n"); | |
357 | return 0; | |
358 | } | |
359 | ||
f9ecc921 N |
360 | static struct ent *nametoid_lookup(struct ent *); |
361 | static struct ent *nametoid_update(struct ent *, struct ent *); | |
fd39ca9a | 362 | static int nametoid_parse(struct cache_detail *, char *, int); |
1da177e4 | 363 | |
fd39ca9a | 364 | static struct cache_detail nametoid_cache = { |
f35279d3 | 365 | .owner = THIS_MODULE, |
1da177e4 LT |
366 | .hash_size = ENT_HASHMAX, |
367 | .hash_table = nametoid_table, | |
368 | .name = "nfs4.nametoid", | |
369 | .cache_put = ent_put, | |
370 | .cache_request = nametoid_request, | |
371 | .cache_parse = nametoid_parse, | |
372 | .cache_show = nametoid_show, | |
373 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
374 | .match = nametoid_match, |
375 | .init = ent_init, | |
376 | .update = ent_init, | |
377 | .alloc = ent_alloc, | |
1da177e4 LT |
378 | }; |
379 | ||
fd39ca9a | 380 | static int |
1da177e4 LT |
381 | nametoid_parse(struct cache_detail *cd, char *buf, int buflen) |
382 | { | |
383 | struct ent ent, *res; | |
384 | char *buf1; | |
385 | int error = -EINVAL; | |
386 | ||
387 | if (buf[buflen - 1] != '\n') | |
388 | return (-EINVAL); | |
389 | buf[buflen - 1]= '\0'; | |
390 | ||
391 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
392 | if (buf1 == NULL) | |
393 | return (-ENOMEM); | |
394 | ||
395 | memset(&ent, 0, sizeof(ent)); | |
396 | ||
397 | /* Authentication name */ | |
398 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
399 | goto out; | |
400 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
401 | ||
402 | /* Type */ | |
403 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
404 | goto out; | |
405 | ent.type = strcmp(buf1, "user") == 0 ? | |
406 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
407 | ||
408 | /* Name */ | |
409 | error = qword_get(&buf, buf1, PAGE_SIZE); | |
410 | if (error <= 0 || error >= IDMAP_NAMESZ) | |
411 | goto out; | |
412 | memcpy(ent.name, buf1, sizeof(ent.name)); | |
413 | ||
414 | /* expiry */ | |
415 | ent.h.expiry_time = get_expiry(&buf); | |
416 | if (ent.h.expiry_time == 0) | |
417 | goto out; | |
418 | ||
419 | /* ID */ | |
420 | error = get_int(&buf, &ent.id); | |
421 | if (error == -EINVAL) | |
422 | goto out; | |
423 | if (error == -ENOENT) | |
424 | set_bit(CACHE_NEGATIVE, &ent.h.flags); | |
425 | ||
426 | error = -ENOMEM; | |
f9ecc921 N |
427 | res = nametoid_lookup(&ent); |
428 | if (res == NULL) | |
429 | goto out; | |
430 | res = nametoid_update(&ent, res); | |
431 | if (res == NULL) | |
1da177e4 LT |
432 | goto out; |
433 | ||
baab935f | 434 | cache_put(&res->h, &nametoid_cache); |
1da177e4 LT |
435 | error = 0; |
436 | out: | |
437 | kfree(buf1); | |
438 | ||
439 | return (error); | |
440 | } | |
441 | ||
f9ecc921 N |
442 | |
443 | static struct ent * | |
444 | nametoid_lookup(struct ent *item) | |
445 | { | |
446 | struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache, | |
447 | &item->h, | |
448 | nametoid_hash(item)); | |
449 | if (ch) | |
450 | return container_of(ch, struct ent, h); | |
451 | else | |
452 | return NULL; | |
453 | } | |
454 | ||
455 | static struct ent * | |
456 | nametoid_update(struct ent *new, struct ent *old) | |
457 | { | |
458 | struct cache_head *ch = sunrpc_cache_update(&nametoid_cache, | |
459 | &new->h, &old->h, | |
460 | nametoid_hash(new)); | |
461 | if (ch) | |
462 | return container_of(ch, struct ent, h); | |
463 | else | |
464 | return NULL; | |
465 | } | |
1da177e4 LT |
466 | |
467 | /* | |
468 | * Exported API | |
469 | */ | |
470 | ||
471 | void | |
472 | nfsd_idmap_init(void) | |
473 | { | |
474 | cache_register(&idtoname_cache); | |
475 | cache_register(&nametoid_cache); | |
476 | } | |
477 | ||
478 | void | |
479 | nfsd_idmap_shutdown(void) | |
480 | { | |
f35279d3 BA |
481 | if (cache_unregister(&idtoname_cache)) |
482 | printk(KERN_ERR "nfsd: failed to unregister idtoname cache\n"); | |
483 | if (cache_unregister(&nametoid_cache)) | |
484 | printk(KERN_ERR "nfsd: failed to unregister nametoid cache\n"); | |
1da177e4 LT |
485 | } |
486 | ||
487 | /* | |
488 | * Deferred request handling | |
489 | */ | |
490 | ||
491 | struct idmap_defer_req { | |
492 | struct cache_req req; | |
493 | struct cache_deferred_req deferred_req; | |
494 | wait_queue_head_t waitq; | |
495 | atomic_t count; | |
496 | }; | |
497 | ||
498 | static inline void | |
499 | put_mdr(struct idmap_defer_req *mdr) | |
500 | { | |
501 | if (atomic_dec_and_test(&mdr->count)) | |
502 | kfree(mdr); | |
503 | } | |
504 | ||
505 | static inline void | |
506 | get_mdr(struct idmap_defer_req *mdr) | |
507 | { | |
508 | atomic_inc(&mdr->count); | |
509 | } | |
510 | ||
511 | static void | |
512 | idmap_revisit(struct cache_deferred_req *dreq, int toomany) | |
513 | { | |
514 | struct idmap_defer_req *mdr = | |
515 | container_of(dreq, struct idmap_defer_req, deferred_req); | |
516 | ||
517 | wake_up(&mdr->waitq); | |
518 | put_mdr(mdr); | |
519 | } | |
520 | ||
521 | static struct cache_deferred_req * | |
522 | idmap_defer(struct cache_req *req) | |
523 | { | |
524 | struct idmap_defer_req *mdr = | |
525 | container_of(req, struct idmap_defer_req, req); | |
526 | ||
527 | mdr->deferred_req.revisit = idmap_revisit; | |
528 | get_mdr(mdr); | |
529 | return (&mdr->deferred_req); | |
530 | } | |
531 | ||
532 | static inline int | |
f9ecc921 | 533 | do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
1da177e4 LT |
534 | struct cache_detail *detail, struct ent **item, |
535 | struct idmap_defer_req *mdr) | |
536 | { | |
f9ecc921 | 537 | *item = lookup_fn(key); |
1da177e4 LT |
538 | if (!*item) |
539 | return -ENOMEM; | |
540 | return cache_check(detail, &(*item)->h, &mdr->req); | |
541 | } | |
542 | ||
543 | static inline int | |
f9ecc921 | 544 | do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *), |
1da177e4 LT |
545 | struct ent *key, struct cache_detail *detail, |
546 | struct ent **item) | |
547 | { | |
548 | int ret = -ENOMEM; | |
549 | ||
f9ecc921 | 550 | *item = lookup_fn(key); |
1da177e4 LT |
551 | if (!*item) |
552 | goto out_err; | |
553 | ret = -ETIMEDOUT; | |
554 | if (!test_bit(CACHE_VALID, &(*item)->h.flags) | |
555 | || (*item)->h.expiry_time < get_seconds() | |
556 | || detail->flush_time > (*item)->h.last_refresh) | |
557 | goto out_put; | |
558 | ret = -ENOENT; | |
559 | if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags)) | |
560 | goto out_put; | |
561 | return 0; | |
562 | out_put: | |
baab935f | 563 | cache_put(&(*item)->h, detail); |
1da177e4 LT |
564 | out_err: |
565 | *item = NULL; | |
566 | return ret; | |
567 | } | |
568 | ||
569 | static int | |
570 | idmap_lookup(struct svc_rqst *rqstp, | |
f9ecc921 | 571 | struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
1da177e4 LT |
572 | struct cache_detail *detail, struct ent **item) |
573 | { | |
574 | struct idmap_defer_req *mdr; | |
575 | int ret; | |
576 | ||
577 | mdr = kmalloc(sizeof(*mdr), GFP_KERNEL); | |
578 | if (!mdr) | |
579 | return -ENOMEM; | |
580 | memset(mdr, 0, sizeof(*mdr)); | |
581 | atomic_set(&mdr->count, 1); | |
582 | init_waitqueue_head(&mdr->waitq); | |
583 | mdr->req.defer = idmap_defer; | |
584 | ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr); | |
585 | if (ret == -EAGAIN) { | |
586 | wait_event_interruptible_timeout(mdr->waitq, | |
587 | test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ); | |
588 | ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item); | |
589 | } | |
590 | put_mdr(mdr); | |
591 | return ret; | |
592 | } | |
593 | ||
594 | static int | |
595 | idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, | |
596 | uid_t *id) | |
597 | { | |
598 | struct ent *item, key = { | |
599 | .type = type, | |
600 | }; | |
601 | int ret; | |
602 | ||
603 | if (namelen + 1 > sizeof(key.name)) | |
604 | return -EINVAL; | |
605 | memcpy(key.name, name, namelen); | |
606 | key.name[namelen] = '\0'; | |
607 | strlcpy(key.authname, rqstp->rq_client->name, sizeof(key.authname)); | |
608 | ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item); | |
609 | if (ret == -ENOENT) | |
610 | ret = -ESRCH; /* nfserr_badname */ | |
611 | if (ret) | |
612 | return ret; | |
613 | *id = item->id; | |
baab935f | 614 | cache_put(&item->h, &nametoid_cache); |
1da177e4 LT |
615 | return 0; |
616 | } | |
617 | ||
618 | static int | |
619 | idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name) | |
620 | { | |
621 | struct ent *item, key = { | |
622 | .id = id, | |
623 | .type = type, | |
624 | }; | |
625 | int ret; | |
626 | ||
627 | strlcpy(key.authname, rqstp->rq_client->name, sizeof(key.authname)); | |
628 | ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item); | |
629 | if (ret == -ENOENT) | |
630 | return sprintf(name, "%u", id); | |
631 | if (ret) | |
632 | return ret; | |
633 | ret = strlen(item->name); | |
634 | BUG_ON(ret > IDMAP_NAMESZ); | |
635 | memcpy(name, item->name, ret); | |
baab935f | 636 | cache_put(&item->h, &idtoname_cache); |
1da177e4 LT |
637 | return ret; |
638 | } | |
639 | ||
640 | int | |
641 | nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, | |
642 | __u32 *id) | |
643 | { | |
644 | return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id); | |
645 | } | |
646 | ||
647 | int | |
648 | nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, | |
649 | __u32 *id) | |
650 | { | |
651 | return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id); | |
652 | } | |
653 | ||
654 | int | |
655 | nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) | |
656 | { | |
657 | return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name); | |
658 | } | |
659 | ||
660 | int | |
661 | nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) | |
662 | { | |
663 | return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name); | |
664 | } |