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 | ||
1da177e4 LT |
37 | #include <linux/module.h> |
38 | #include <linux/init.h> | |
39 | ||
40 | #include <linux/mm.h> | |
41 | #include <linux/utsname.h> | |
42 | #include <linux/errno.h> | |
43 | #include <linux/string.h> | |
44 | #include <linux/sunrpc/clnt.h> | |
45 | #include <linux/nfs.h> | |
46 | #include <linux/nfs4.h> | |
47 | #include <linux/nfs_fs.h> | |
48 | #include <linux/nfs_page.h> | |
1da177e4 LT |
49 | #include <linux/sunrpc/cache.h> |
50 | #include <linux/nfsd_idmap.h> | |
51 | #include <linux/list.h> | |
1da177e4 LT |
52 | #include <linux/time.h> |
53 | #include <linux/seq_file.h> | |
54 | #include <linux/sunrpc/svcauth.h> | |
55 | ||
56 | /* | |
57 | * Cache entry | |
58 | */ | |
59 | ||
60 | /* | |
61 | * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on | |
62 | * that. | |
63 | */ | |
64 | ||
65 | #define IDMAP_TYPE_USER 0 | |
66 | #define IDMAP_TYPE_GROUP 1 | |
67 | ||
68 | struct ent { | |
69 | struct cache_head h; | |
70 | int type; /* User / Group */ | |
71 | uid_t id; | |
72 | char name[IDMAP_NAMESZ]; | |
73 | char authname[IDMAP_NAMESZ]; | |
74 | }; | |
75 | ||
1da177e4 LT |
76 | /* Common entry handling */ |
77 | ||
78 | #define ENT_HASHBITS 8 | |
79 | #define ENT_HASHMAX (1 << ENT_HASHBITS) | |
80 | #define ENT_HASHMASK (ENT_HASHMAX - 1) | |
81 | ||
f9ecc921 N |
82 | static void |
83 | ent_init(struct cache_head *cnew, struct cache_head *citm) | |
1da177e4 | 84 | { |
f9ecc921 N |
85 | struct ent *new = container_of(cnew, struct ent, h); |
86 | struct ent *itm = container_of(citm, struct ent, h); | |
87 | ||
1da177e4 LT |
88 | new->id = itm->id; |
89 | new->type = itm->type; | |
90 | ||
91 | strlcpy(new->name, itm->name, sizeof(new->name)); | |
92 | strlcpy(new->authname, itm->authname, sizeof(new->name)); | |
93 | } | |
94 | ||
fd39ca9a | 95 | static void |
baab935f | 96 | ent_put(struct kref *ref) |
1da177e4 | 97 | { |
baab935f N |
98 | struct ent *map = container_of(ref, struct ent, h.ref); |
99 | kfree(map); | |
1da177e4 LT |
100 | } |
101 | ||
f9ecc921 N |
102 | static struct cache_head * |
103 | ent_alloc(void) | |
104 | { | |
105 | struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL); | |
106 | if (e) | |
107 | return &e->h; | |
108 | else | |
109 | return NULL; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | /* |
113 | * ID -> Name cache | |
114 | */ | |
115 | ||
116 | static struct cache_head *idtoname_table[ENT_HASHMAX]; | |
117 | ||
118 | static uint32_t | |
119 | idtoname_hash(struct ent *ent) | |
120 | { | |
121 | uint32_t hash; | |
122 | ||
123 | hash = hash_str(ent->authname, ENT_HASHBITS); | |
124 | hash = hash_long(hash ^ ent->id, ENT_HASHBITS); | |
125 | ||
126 | /* Flip LSB for user/group */ | |
127 | if (ent->type == IDMAP_TYPE_GROUP) | |
128 | hash ^= 1; | |
129 | ||
130 | return hash; | |
131 | } | |
132 | ||
133 | static void | |
134 | idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, | |
135 | int *blen) | |
136 | { | |
137 | struct ent *ent = container_of(ch, struct ent, h); | |
138 | char idstr[11]; | |
139 | ||
140 | qword_add(bpp, blen, ent->authname); | |
0a725fc4 | 141 | snprintf(idstr, sizeof(idstr), "%u", ent->id); |
1da177e4 LT |
142 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); |
143 | qword_add(bpp, blen, idstr); | |
144 | ||
145 | (*bpp)[-1] = '\n'; | |
146 | } | |
147 | ||
bc74b4f5 TM |
148 | static int |
149 | idtoname_upcall(struct cache_detail *cd, struct cache_head *ch) | |
150 | { | |
151 | return sunrpc_cache_pipe_upcall(cd, ch, idtoname_request); | |
152 | } | |
153 | ||
f9ecc921 N |
154 | static int |
155 | idtoname_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 156 | { |
f9ecc921 N |
157 | struct ent *a = container_of(ca, struct ent, h); |
158 | struct ent *b = container_of(cb, struct ent, h); | |
159 | ||
1da177e4 LT |
160 | return (a->id == b->id && a->type == b->type && |
161 | strcmp(a->authname, b->authname) == 0); | |
162 | } | |
163 | ||
164 | static int | |
165 | idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
166 | { | |
167 | struct ent *ent; | |
168 | ||
169 | if (h == NULL) { | |
170 | seq_puts(m, "#domain type id [name]\n"); | |
171 | return 0; | |
172 | } | |
173 | ent = container_of(h, struct ent, h); | |
0a725fc4 | 174 | seq_printf(m, "%s %s %u", ent->authname, |
1da177e4 LT |
175 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", |
176 | ent->id); | |
177 | if (test_bit(CACHE_VALID, &h->flags)) | |
178 | seq_printf(m, " %s", ent->name); | |
179 | seq_printf(m, "\n"); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | static void | |
2da8ca26 | 184 | warn_no_idmapd(struct cache_detail *detail, int has_died) |
1da177e4 LT |
185 | { |
186 | printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n", | |
2da8ca26 | 187 | has_died ? "died" : "not been started"); |
1da177e4 LT |
188 | } |
189 | ||
190 | ||
191 | static int idtoname_parse(struct cache_detail *, char *, int); | |
f9ecc921 N |
192 | static struct ent *idtoname_lookup(struct ent *); |
193 | static struct ent *idtoname_update(struct ent *, struct ent *); | |
1da177e4 | 194 | |
fd39ca9a | 195 | static struct cache_detail idtoname_cache = { |
f35279d3 | 196 | .owner = THIS_MODULE, |
1da177e4 LT |
197 | .hash_size = ENT_HASHMAX, |
198 | .hash_table = idtoname_table, | |
199 | .name = "nfs4.idtoname", | |
200 | .cache_put = ent_put, | |
bc74b4f5 | 201 | .cache_upcall = idtoname_upcall, |
1da177e4 LT |
202 | .cache_parse = idtoname_parse, |
203 | .cache_show = idtoname_show, | |
204 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
205 | .match = idtoname_match, |
206 | .init = ent_init, | |
207 | .update = ent_init, | |
208 | .alloc = ent_alloc, | |
1da177e4 LT |
209 | }; |
210 | ||
a254b246 | 211 | static int |
1da177e4 LT |
212 | idtoname_parse(struct cache_detail *cd, char *buf, int buflen) |
213 | { | |
214 | struct ent ent, *res; | |
215 | char *buf1, *bp; | |
c9b6cbe5 | 216 | int len; |
1da177e4 LT |
217 | int error = -EINVAL; |
218 | ||
219 | if (buf[buflen - 1] != '\n') | |
220 | return (-EINVAL); | |
221 | buf[buflen - 1]= '\0'; | |
222 | ||
223 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
224 | if (buf1 == NULL) | |
225 | return (-ENOMEM); | |
226 | ||
227 | memset(&ent, 0, sizeof(ent)); | |
228 | ||
229 | /* Authentication name */ | |
230 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
231 | goto out; | |
232 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
233 | ||
234 | /* Type */ | |
235 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
236 | goto out; | |
237 | ent.type = strcmp(buf1, "user") == 0 ? | |
238 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
239 | ||
240 | /* ID */ | |
241 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
242 | goto out; | |
243 | ent.id = simple_strtoul(buf1, &bp, 10); | |
244 | if (bp == buf1) | |
245 | goto out; | |
246 | ||
247 | /* expiry */ | |
248 | ent.h.expiry_time = get_expiry(&buf); | |
249 | if (ent.h.expiry_time == 0) | |
250 | goto out; | |
251 | ||
f9ecc921 N |
252 | error = -ENOMEM; |
253 | res = idtoname_lookup(&ent); | |
254 | if (!res) | |
255 | goto out; | |
256 | ||
1da177e4 | 257 | /* Name */ |
c9b6cbe5 BF |
258 | error = -EINVAL; |
259 | len = qword_get(&buf, buf1, PAGE_SIZE); | |
260 | if (len < 0) | |
1da177e4 | 261 | goto out; |
c9b6cbe5 | 262 | if (len == 0) |
1da177e4 | 263 | set_bit(CACHE_NEGATIVE, &ent.h.flags); |
d4395e03 BF |
264 | else if (len >= IDMAP_NAMESZ) |
265 | goto out; | |
266 | else | |
1da177e4 | 267 | memcpy(ent.name, buf1, sizeof(ent.name)); |
1da177e4 | 268 | error = -ENOMEM; |
f9ecc921 N |
269 | res = idtoname_update(&ent, res); |
270 | if (res == NULL) | |
1da177e4 LT |
271 | goto out; |
272 | ||
baab935f | 273 | cache_put(&res->h, &idtoname_cache); |
1da177e4 LT |
274 | |
275 | error = 0; | |
276 | out: | |
277 | kfree(buf1); | |
278 | ||
279 | return error; | |
280 | } | |
281 | ||
f9ecc921 N |
282 | |
283 | static struct ent * | |
284 | idtoname_lookup(struct ent *item) | |
285 | { | |
286 | struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache, | |
287 | &item->h, | |
288 | idtoname_hash(item)); | |
289 | if (ch) | |
290 | return container_of(ch, struct ent, h); | |
291 | else | |
292 | return NULL; | |
293 | } | |
294 | ||
295 | static struct ent * | |
296 | idtoname_update(struct ent *new, struct ent *old) | |
297 | { | |
298 | struct cache_head *ch = sunrpc_cache_update(&idtoname_cache, | |
299 | &new->h, &old->h, | |
300 | idtoname_hash(new)); | |
301 | if (ch) | |
302 | return container_of(ch, struct ent, h); | |
303 | else | |
304 | return NULL; | |
305 | } | |
306 | ||
1da177e4 LT |
307 | |
308 | /* | |
309 | * Name -> ID cache | |
310 | */ | |
311 | ||
312 | static struct cache_head *nametoid_table[ENT_HASHMAX]; | |
313 | ||
314 | static inline int | |
315 | nametoid_hash(struct ent *ent) | |
316 | { | |
317 | return hash_str(ent->name, ENT_HASHBITS); | |
318 | } | |
319 | ||
fd39ca9a | 320 | static void |
1da177e4 LT |
321 | nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp, |
322 | int *blen) | |
323 | { | |
324 | struct ent *ent = container_of(ch, struct ent, h); | |
325 | ||
326 | qword_add(bpp, blen, ent->authname); | |
327 | qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user"); | |
328 | qword_add(bpp, blen, ent->name); | |
329 | ||
330 | (*bpp)[-1] = '\n'; | |
331 | } | |
332 | ||
bc74b4f5 TM |
333 | static int |
334 | nametoid_upcall(struct cache_detail *cd, struct cache_head *ch) | |
335 | { | |
336 | return sunrpc_cache_pipe_upcall(cd, ch, nametoid_request); | |
337 | } | |
338 | ||
f9ecc921 N |
339 | static int |
340 | nametoid_match(struct cache_head *ca, struct cache_head *cb) | |
1da177e4 | 341 | { |
f9ecc921 N |
342 | struct ent *a = container_of(ca, struct ent, h); |
343 | struct ent *b = container_of(cb, struct ent, h); | |
344 | ||
1da177e4 LT |
345 | return (a->type == b->type && strcmp(a->name, b->name) == 0 && |
346 | strcmp(a->authname, b->authname) == 0); | |
347 | } | |
348 | ||
349 | static int | |
350 | nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h) | |
351 | { | |
352 | struct ent *ent; | |
353 | ||
354 | if (h == NULL) { | |
355 | seq_puts(m, "#domain type name [id]\n"); | |
356 | return 0; | |
357 | } | |
358 | ent = container_of(h, struct ent, h); | |
359 | seq_printf(m, "%s %s %s", ent->authname, | |
360 | ent->type == IDMAP_TYPE_GROUP ? "group" : "user", | |
361 | ent->name); | |
362 | if (test_bit(CACHE_VALID, &h->flags)) | |
0a725fc4 | 363 | seq_printf(m, " %u", ent->id); |
1da177e4 LT |
364 | seq_printf(m, "\n"); |
365 | return 0; | |
366 | } | |
367 | ||
f9ecc921 N |
368 | static struct ent *nametoid_lookup(struct ent *); |
369 | static struct ent *nametoid_update(struct ent *, struct ent *); | |
fd39ca9a | 370 | static int nametoid_parse(struct cache_detail *, char *, int); |
1da177e4 | 371 | |
fd39ca9a | 372 | static struct cache_detail nametoid_cache = { |
f35279d3 | 373 | .owner = THIS_MODULE, |
1da177e4 LT |
374 | .hash_size = ENT_HASHMAX, |
375 | .hash_table = nametoid_table, | |
376 | .name = "nfs4.nametoid", | |
377 | .cache_put = ent_put, | |
bc74b4f5 | 378 | .cache_upcall = nametoid_upcall, |
1da177e4 LT |
379 | .cache_parse = nametoid_parse, |
380 | .cache_show = nametoid_show, | |
381 | .warn_no_listener = warn_no_idmapd, | |
f9ecc921 N |
382 | .match = nametoid_match, |
383 | .init = ent_init, | |
384 | .update = ent_init, | |
385 | .alloc = ent_alloc, | |
1da177e4 LT |
386 | }; |
387 | ||
fd39ca9a | 388 | static int |
1da177e4 LT |
389 | nametoid_parse(struct cache_detail *cd, char *buf, int buflen) |
390 | { | |
391 | struct ent ent, *res; | |
392 | char *buf1; | |
393 | int error = -EINVAL; | |
394 | ||
395 | if (buf[buflen - 1] != '\n') | |
396 | return (-EINVAL); | |
397 | buf[buflen - 1]= '\0'; | |
398 | ||
399 | buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
400 | if (buf1 == NULL) | |
401 | return (-ENOMEM); | |
402 | ||
403 | memset(&ent, 0, sizeof(ent)); | |
404 | ||
405 | /* Authentication name */ | |
406 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
407 | goto out; | |
408 | memcpy(ent.authname, buf1, sizeof(ent.authname)); | |
409 | ||
410 | /* Type */ | |
411 | if (qword_get(&buf, buf1, PAGE_SIZE) <= 0) | |
412 | goto out; | |
413 | ent.type = strcmp(buf1, "user") == 0 ? | |
414 | IDMAP_TYPE_USER : IDMAP_TYPE_GROUP; | |
415 | ||
416 | /* Name */ | |
417 | error = qword_get(&buf, buf1, PAGE_SIZE); | |
418 | if (error <= 0 || error >= IDMAP_NAMESZ) | |
419 | goto out; | |
420 | memcpy(ent.name, buf1, sizeof(ent.name)); | |
421 | ||
422 | /* expiry */ | |
423 | ent.h.expiry_time = get_expiry(&buf); | |
424 | if (ent.h.expiry_time == 0) | |
425 | goto out; | |
426 | ||
427 | /* ID */ | |
428 | error = get_int(&buf, &ent.id); | |
429 | if (error == -EINVAL) | |
430 | goto out; | |
431 | if (error == -ENOENT) | |
432 | set_bit(CACHE_NEGATIVE, &ent.h.flags); | |
433 | ||
434 | error = -ENOMEM; | |
f9ecc921 N |
435 | res = nametoid_lookup(&ent); |
436 | if (res == NULL) | |
437 | goto out; | |
438 | res = nametoid_update(&ent, res); | |
439 | if (res == NULL) | |
1da177e4 LT |
440 | goto out; |
441 | ||
baab935f | 442 | cache_put(&res->h, &nametoid_cache); |
1da177e4 LT |
443 | error = 0; |
444 | out: | |
445 | kfree(buf1); | |
446 | ||
447 | return (error); | |
448 | } | |
449 | ||
f9ecc921 N |
450 | |
451 | static struct ent * | |
452 | nametoid_lookup(struct ent *item) | |
453 | { | |
454 | struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache, | |
455 | &item->h, | |
456 | nametoid_hash(item)); | |
457 | if (ch) | |
458 | return container_of(ch, struct ent, h); | |
459 | else | |
460 | return NULL; | |
461 | } | |
462 | ||
463 | static struct ent * | |
464 | nametoid_update(struct ent *new, struct ent *old) | |
465 | { | |
466 | struct cache_head *ch = sunrpc_cache_update(&nametoid_cache, | |
467 | &new->h, &old->h, | |
468 | nametoid_hash(new)); | |
469 | if (ch) | |
470 | return container_of(ch, struct ent, h); | |
471 | else | |
472 | return NULL; | |
473 | } | |
1da177e4 LT |
474 | |
475 | /* | |
476 | * Exported API | |
477 | */ | |
478 | ||
dbf847ec | 479 | int |
1da177e4 LT |
480 | nfsd_idmap_init(void) |
481 | { | |
dbf847ec BF |
482 | int rv; |
483 | ||
484 | rv = cache_register(&idtoname_cache); | |
485 | if (rv) | |
486 | return rv; | |
487 | rv = cache_register(&nametoid_cache); | |
488 | if (rv) | |
489 | cache_unregister(&idtoname_cache); | |
490 | return rv; | |
1da177e4 LT |
491 | } |
492 | ||
493 | void | |
494 | nfsd_idmap_shutdown(void) | |
495 | { | |
df95a9d4 BF |
496 | cache_unregister(&idtoname_cache); |
497 | cache_unregister(&nametoid_cache); | |
1da177e4 LT |
498 | } |
499 | ||
500 | /* | |
501 | * Deferred request handling | |
502 | */ | |
503 | ||
504 | struct idmap_defer_req { | |
505 | struct cache_req req; | |
506 | struct cache_deferred_req deferred_req; | |
507 | wait_queue_head_t waitq; | |
508 | atomic_t count; | |
509 | }; | |
510 | ||
511 | static inline void | |
512 | put_mdr(struct idmap_defer_req *mdr) | |
513 | { | |
514 | if (atomic_dec_and_test(&mdr->count)) | |
515 | kfree(mdr); | |
516 | } | |
517 | ||
518 | static inline void | |
519 | get_mdr(struct idmap_defer_req *mdr) | |
520 | { | |
521 | atomic_inc(&mdr->count); | |
522 | } | |
523 | ||
524 | static void | |
525 | idmap_revisit(struct cache_deferred_req *dreq, int toomany) | |
526 | { | |
527 | struct idmap_defer_req *mdr = | |
528 | container_of(dreq, struct idmap_defer_req, deferred_req); | |
529 | ||
530 | wake_up(&mdr->waitq); | |
531 | put_mdr(mdr); | |
532 | } | |
533 | ||
534 | static struct cache_deferred_req * | |
535 | idmap_defer(struct cache_req *req) | |
536 | { | |
537 | struct idmap_defer_req *mdr = | |
538 | container_of(req, struct idmap_defer_req, req); | |
539 | ||
540 | mdr->deferred_req.revisit = idmap_revisit; | |
541 | get_mdr(mdr); | |
542 | return (&mdr->deferred_req); | |
543 | } | |
544 | ||
545 | static inline int | |
f9ecc921 | 546 | do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
1da177e4 LT |
547 | struct cache_detail *detail, struct ent **item, |
548 | struct idmap_defer_req *mdr) | |
549 | { | |
f9ecc921 | 550 | *item = lookup_fn(key); |
1da177e4 LT |
551 | if (!*item) |
552 | return -ENOMEM; | |
553 | return cache_check(detail, &(*item)->h, &mdr->req); | |
554 | } | |
555 | ||
556 | static inline int | |
f9ecc921 | 557 | do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *), |
1da177e4 LT |
558 | struct ent *key, struct cache_detail *detail, |
559 | struct ent **item) | |
560 | { | |
561 | int ret = -ENOMEM; | |
562 | ||
f9ecc921 | 563 | *item = lookup_fn(key); |
1da177e4 LT |
564 | if (!*item) |
565 | goto out_err; | |
566 | ret = -ETIMEDOUT; | |
567 | if (!test_bit(CACHE_VALID, &(*item)->h.flags) | |
568 | || (*item)->h.expiry_time < get_seconds() | |
569 | || detail->flush_time > (*item)->h.last_refresh) | |
570 | goto out_put; | |
571 | ret = -ENOENT; | |
572 | if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags)) | |
573 | goto out_put; | |
574 | return 0; | |
575 | out_put: | |
baab935f | 576 | cache_put(&(*item)->h, detail); |
1da177e4 LT |
577 | out_err: |
578 | *item = NULL; | |
579 | return ret; | |
580 | } | |
581 | ||
582 | static int | |
583 | idmap_lookup(struct svc_rqst *rqstp, | |
f9ecc921 | 584 | struct ent *(*lookup_fn)(struct ent *), struct ent *key, |
1da177e4 LT |
585 | struct cache_detail *detail, struct ent **item) |
586 | { | |
587 | struct idmap_defer_req *mdr; | |
588 | int ret; | |
589 | ||
f8314dc6 | 590 | mdr = kzalloc(sizeof(*mdr), GFP_KERNEL); |
1da177e4 LT |
591 | if (!mdr) |
592 | return -ENOMEM; | |
1da177e4 LT |
593 | atomic_set(&mdr->count, 1); |
594 | init_waitqueue_head(&mdr->waitq); | |
595 | mdr->req.defer = idmap_defer; | |
596 | ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr); | |
597 | if (ret == -EAGAIN) { | |
598 | wait_event_interruptible_timeout(mdr->waitq, | |
599 | test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ); | |
600 | ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item); | |
601 | } | |
602 | put_mdr(mdr); | |
603 | return ret; | |
604 | } | |
605 | ||
3ab4d8b1 BF |
606 | static char * |
607 | rqst_authname(struct svc_rqst *rqstp) | |
608 | { | |
609 | struct auth_domain *clp; | |
610 | ||
611 | clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client; | |
612 | return clp->name; | |
613 | } | |
614 | ||
1da177e4 LT |
615 | static int |
616 | idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, | |
617 | uid_t *id) | |
618 | { | |
619 | struct ent *item, key = { | |
620 | .type = type, | |
621 | }; | |
622 | int ret; | |
623 | ||
624 | if (namelen + 1 > sizeof(key.name)) | |
625 | return -EINVAL; | |
626 | memcpy(key.name, name, namelen); | |
627 | key.name[namelen] = '\0'; | |
3ab4d8b1 | 628 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
1da177e4 LT |
629 | ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item); |
630 | if (ret == -ENOENT) | |
631 | ret = -ESRCH; /* nfserr_badname */ | |
632 | if (ret) | |
633 | return ret; | |
634 | *id = item->id; | |
baab935f | 635 | cache_put(&item->h, &nametoid_cache); |
1da177e4 LT |
636 | return 0; |
637 | } | |
638 | ||
639 | static int | |
640 | idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name) | |
641 | { | |
642 | struct ent *item, key = { | |
643 | .id = id, | |
644 | .type = type, | |
645 | }; | |
646 | int ret; | |
647 | ||
3ab4d8b1 | 648 | strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname)); |
1da177e4 LT |
649 | ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item); |
650 | if (ret == -ENOENT) | |
651 | return sprintf(name, "%u", id); | |
652 | if (ret) | |
653 | return ret; | |
654 | ret = strlen(item->name); | |
655 | BUG_ON(ret > IDMAP_NAMESZ); | |
656 | memcpy(name, item->name, ret); | |
baab935f | 657 | cache_put(&item->h, &idtoname_cache); |
1da177e4 LT |
658 | return ret; |
659 | } | |
660 | ||
661 | int | |
662 | nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen, | |
663 | __u32 *id) | |
664 | { | |
665 | return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id); | |
666 | } | |
667 | ||
668 | int | |
669 | nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen, | |
670 | __u32 *id) | |
671 | { | |
672 | return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id); | |
673 | } | |
674 | ||
675 | int | |
676 | nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) | |
677 | { | |
678 | return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name); | |
679 | } | |
680 | ||
681 | int | |
682 | nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name) | |
683 | { | |
684 | return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name); | |
685 | } |