blob: e4a83d727afda0e2f85e293783dce44b2e351fd5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#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>
49#include <linux/smp_lock.h>
50#include <linux/sunrpc/cache.h>
51#include <linux/nfsd_idmap.h>
52#include <linux/list.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#include <linux/time.h>
54#include <linux/seq_file.h>
55#include <linux/sunrpc/svcauth.h>
56
57/*
58 * Cache entry
59 */
60
61/*
62 * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
63 * that.
64 */
65
66#define IDMAP_TYPE_USER 0
67#define IDMAP_TYPE_GROUP 1
68
69struct ent {
70 struct cache_head h;
71 int type; /* User / Group */
72 uid_t id;
73 char name[IDMAP_NAMESZ];
74 char authname[IDMAP_NAMESZ];
75};
76
Linus Torvalds1da177e2005-04-16 15:20:36 -070077/* Common entry handling */
78
79#define ENT_HASHBITS 8
80#define ENT_HASHMAX (1 << ENT_HASHBITS)
81#define ENT_HASHMASK (ENT_HASHMAX - 1)
82
NeilBrownf9ecc922006-03-27 01:15:06 -080083static void
84ent_init(struct cache_head *cnew, struct cache_head *citm)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
NeilBrownf9ecc922006-03-27 01:15:06 -080086 struct ent *new = container_of(cnew, struct ent, h);
87 struct ent *itm = container_of(citm, struct ent, h);
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 new->id = itm->id;
90 new->type = itm->type;
91
92 strlcpy(new->name, itm->name, sizeof(new->name));
93 strlcpy(new->authname, itm->authname, sizeof(new->name));
94}
95
NeilBrownfd39ca92005-06-23 22:04:03 -070096static void
NeilBrownbaab9352006-03-27 01:15:09 -080097ent_put(struct kref *ref)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
NeilBrownbaab9352006-03-27 01:15:09 -080099 struct ent *map = container_of(ref, struct ent, h.ref);
100 kfree(map);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
NeilBrownf9ecc922006-03-27 01:15:06 -0800103static struct cache_head *
104ent_alloc(void)
105{
106 struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
107 if (e)
108 return &e->h;
109 else
110 return NULL;
111}
112
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113/*
114 * ID -> Name cache
115 */
116
117static struct cache_head *idtoname_table[ENT_HASHMAX];
118
119static uint32_t
120idtoname_hash(struct ent *ent)
121{
122 uint32_t hash;
123
124 hash = hash_str(ent->authname, ENT_HASHBITS);
125 hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
126
127 /* Flip LSB for user/group */
128 if (ent->type == IDMAP_TYPE_GROUP)
129 hash ^= 1;
130
131 return hash;
132}
133
134static void
135idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
136 int *blen)
137{
138 struct ent *ent = container_of(ch, struct ent, h);
139 char idstr[11];
140
141 qword_add(bpp, blen, ent->authname);
142 snprintf(idstr, sizeof(idstr), "%d", ent->id);
143 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
144 qword_add(bpp, blen, idstr);
145
146 (*bpp)[-1] = '\n';
147}
148
NeilBrownf9ecc922006-03-27 01:15:06 -0800149static int
150idtoname_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
NeilBrownf9ecc922006-03-27 01:15:06 -0800152 struct ent *a = container_of(ca, struct ent, h);
153 struct ent *b = container_of(cb, struct ent, h);
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 return (a->id == b->id && a->type == b->type &&
156 strcmp(a->authname, b->authname) == 0);
157}
158
159static int
160idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
161{
162 struct ent *ent;
163
164 if (h == NULL) {
165 seq_puts(m, "#domain type id [name]\n");
166 return 0;
167 }
168 ent = container_of(h, struct ent, h);
169 seq_printf(m, "%s %s %d", ent->authname,
170 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
171 ent->id);
172 if (test_bit(CACHE_VALID, &h->flags))
173 seq_printf(m, " %s", ent->name);
174 seq_printf(m, "\n");
175 return 0;
176}
177
178static void
179warn_no_idmapd(struct cache_detail *detail)
180{
181 printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
182 detail->last_close? "died" : "not been started");
183}
184
185
186static int idtoname_parse(struct cache_detail *, char *, int);
NeilBrownf9ecc922006-03-27 01:15:06 -0800187static struct ent *idtoname_lookup(struct ent *);
188static struct ent *idtoname_update(struct ent *, struct ent *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189
NeilBrownfd39ca92005-06-23 22:04:03 -0700190static struct cache_detail idtoname_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700191 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 .hash_size = ENT_HASHMAX,
193 .hash_table = idtoname_table,
194 .name = "nfs4.idtoname",
195 .cache_put = ent_put,
196 .cache_request = idtoname_request,
197 .cache_parse = idtoname_parse,
198 .cache_show = idtoname_show,
199 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800200 .match = idtoname_match,
201 .init = ent_init,
202 .update = ent_init,
203 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204};
205
206int
207idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
208{
209 struct ent ent, *res;
210 char *buf1, *bp;
211 int error = -EINVAL;
212
213 if (buf[buflen - 1] != '\n')
214 return (-EINVAL);
215 buf[buflen - 1]= '\0';
216
217 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
218 if (buf1 == NULL)
219 return (-ENOMEM);
220
221 memset(&ent, 0, sizeof(ent));
222
223 /* Authentication name */
224 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
225 goto out;
226 memcpy(ent.authname, buf1, sizeof(ent.authname));
227
228 /* Type */
229 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
230 goto out;
231 ent.type = strcmp(buf1, "user") == 0 ?
232 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
233
234 /* ID */
235 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
236 goto out;
237 ent.id = simple_strtoul(buf1, &bp, 10);
238 if (bp == buf1)
239 goto out;
240
241 /* expiry */
242 ent.h.expiry_time = get_expiry(&buf);
243 if (ent.h.expiry_time == 0)
244 goto out;
245
NeilBrownf9ecc922006-03-27 01:15:06 -0800246 error = -ENOMEM;
247 res = idtoname_lookup(&ent);
248 if (!res)
249 goto out;
250
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 /* Name */
252 error = qword_get(&buf, buf1, PAGE_SIZE);
253 if (error == -EINVAL)
254 goto out;
255 if (error == -ENOENT)
256 set_bit(CACHE_NEGATIVE, &ent.h.flags);
257 else {
258 if (error >= IDMAP_NAMESZ) {
259 error = -EINVAL;
260 goto out;
261 }
262 memcpy(ent.name, buf1, sizeof(ent.name));
263 }
264 error = -ENOMEM;
NeilBrownf9ecc922006-03-27 01:15:06 -0800265 res = idtoname_update(&ent, res);
266 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 goto out;
268
NeilBrownbaab9352006-03-27 01:15:09 -0800269 cache_put(&res->h, &idtoname_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 error = 0;
272out:
273 kfree(buf1);
274
275 return error;
276}
277
NeilBrownf9ecc922006-03-27 01:15:06 -0800278
279static struct ent *
280idtoname_lookup(struct ent *item)
281{
282 struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache,
283 &item->h,
284 idtoname_hash(item));
285 if (ch)
286 return container_of(ch, struct ent, h);
287 else
288 return NULL;
289}
290
291static struct ent *
292idtoname_update(struct ent *new, struct ent *old)
293{
294 struct cache_head *ch = sunrpc_cache_update(&idtoname_cache,
295 &new->h, &old->h,
296 idtoname_hash(new));
297 if (ch)
298 return container_of(ch, struct ent, h);
299 else
300 return NULL;
301}
302
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303
304/*
305 * Name -> ID cache
306 */
307
308static struct cache_head *nametoid_table[ENT_HASHMAX];
309
310static inline int
311nametoid_hash(struct ent *ent)
312{
313 return hash_str(ent->name, ENT_HASHBITS);
314}
315
NeilBrownfd39ca92005-06-23 22:04:03 -0700316static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
318 int *blen)
319{
320 struct ent *ent = container_of(ch, struct ent, h);
321
322 qword_add(bpp, blen, ent->authname);
323 qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
324 qword_add(bpp, blen, ent->name);
325
326 (*bpp)[-1] = '\n';
327}
328
NeilBrownf9ecc922006-03-27 01:15:06 -0800329static int
330nametoid_match(struct cache_head *ca, struct cache_head *cb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
NeilBrownf9ecc922006-03-27 01:15:06 -0800332 struct ent *a = container_of(ca, struct ent, h);
333 struct ent *b = container_of(cb, struct ent, h);
334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
336 strcmp(a->authname, b->authname) == 0);
337}
338
339static int
340nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
341{
342 struct ent *ent;
343
344 if (h == NULL) {
345 seq_puts(m, "#domain type name [id]\n");
346 return 0;
347 }
348 ent = container_of(h, struct ent, h);
349 seq_printf(m, "%s %s %s", ent->authname,
350 ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
351 ent->name);
352 if (test_bit(CACHE_VALID, &h->flags))
353 seq_printf(m, " %d", ent->id);
354 seq_printf(m, "\n");
355 return 0;
356}
357
NeilBrownf9ecc922006-03-27 01:15:06 -0800358static struct ent *nametoid_lookup(struct ent *);
359static struct ent *nametoid_update(struct ent *, struct ent *);
NeilBrownfd39ca92005-06-23 22:04:03 -0700360static int nametoid_parse(struct cache_detail *, char *, int);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361
NeilBrownfd39ca92005-06-23 22:04:03 -0700362static struct cache_detail nametoid_cache = {
Bruce Allanf35279d2005-09-06 15:17:08 -0700363 .owner = THIS_MODULE,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 .hash_size = ENT_HASHMAX,
365 .hash_table = nametoid_table,
366 .name = "nfs4.nametoid",
367 .cache_put = ent_put,
368 .cache_request = nametoid_request,
369 .cache_parse = nametoid_parse,
370 .cache_show = nametoid_show,
371 .warn_no_listener = warn_no_idmapd,
NeilBrownf9ecc922006-03-27 01:15:06 -0800372 .match = nametoid_match,
373 .init = ent_init,
374 .update = ent_init,
375 .alloc = ent_alloc,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376};
377
NeilBrownfd39ca92005-06-23 22:04:03 -0700378static int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
380{
381 struct ent ent, *res;
382 char *buf1;
383 int error = -EINVAL;
384
385 if (buf[buflen - 1] != '\n')
386 return (-EINVAL);
387 buf[buflen - 1]= '\0';
388
389 buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
390 if (buf1 == NULL)
391 return (-ENOMEM);
392
393 memset(&ent, 0, sizeof(ent));
394
395 /* Authentication name */
396 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
397 goto out;
398 memcpy(ent.authname, buf1, sizeof(ent.authname));
399
400 /* Type */
401 if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
402 goto out;
403 ent.type = strcmp(buf1, "user") == 0 ?
404 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
405
406 /* Name */
407 error = qword_get(&buf, buf1, PAGE_SIZE);
408 if (error <= 0 || error >= IDMAP_NAMESZ)
409 goto out;
410 memcpy(ent.name, buf1, sizeof(ent.name));
411
412 /* expiry */
413 ent.h.expiry_time = get_expiry(&buf);
414 if (ent.h.expiry_time == 0)
415 goto out;
416
417 /* ID */
418 error = get_int(&buf, &ent.id);
419 if (error == -EINVAL)
420 goto out;
421 if (error == -ENOENT)
422 set_bit(CACHE_NEGATIVE, &ent.h.flags);
423
424 error = -ENOMEM;
NeilBrownf9ecc922006-03-27 01:15:06 -0800425 res = nametoid_lookup(&ent);
426 if (res == NULL)
427 goto out;
428 res = nametoid_update(&ent, res);
429 if (res == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 goto out;
431
NeilBrownbaab9352006-03-27 01:15:09 -0800432 cache_put(&res->h, &nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 error = 0;
434out:
435 kfree(buf1);
436
437 return (error);
438}
439
NeilBrownf9ecc922006-03-27 01:15:06 -0800440
441static struct ent *
442nametoid_lookup(struct ent *item)
443{
444 struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache,
445 &item->h,
446 nametoid_hash(item));
447 if (ch)
448 return container_of(ch, struct ent, h);
449 else
450 return NULL;
451}
452
453static struct ent *
454nametoid_update(struct ent *new, struct ent *old)
455{
456 struct cache_head *ch = sunrpc_cache_update(&nametoid_cache,
457 &new->h, &old->h,
458 nametoid_hash(new));
459 if (ch)
460 return container_of(ch, struct ent, h);
461 else
462 return NULL;
463}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
465/*
466 * Exported API
467 */
468
469void
470nfsd_idmap_init(void)
471{
472 cache_register(&idtoname_cache);
473 cache_register(&nametoid_cache);
474}
475
476void
477nfsd_idmap_shutdown(void)
478{
Bruce Allanf35279d2005-09-06 15:17:08 -0700479 if (cache_unregister(&idtoname_cache))
480 printk(KERN_ERR "nfsd: failed to unregister idtoname cache\n");
481 if (cache_unregister(&nametoid_cache))
482 printk(KERN_ERR "nfsd: failed to unregister nametoid cache\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483}
484
485/*
486 * Deferred request handling
487 */
488
489struct idmap_defer_req {
490 struct cache_req req;
491 struct cache_deferred_req deferred_req;
492 wait_queue_head_t waitq;
493 atomic_t count;
494};
495
496static inline void
497put_mdr(struct idmap_defer_req *mdr)
498{
499 if (atomic_dec_and_test(&mdr->count))
500 kfree(mdr);
501}
502
503static inline void
504get_mdr(struct idmap_defer_req *mdr)
505{
506 atomic_inc(&mdr->count);
507}
508
509static void
510idmap_revisit(struct cache_deferred_req *dreq, int toomany)
511{
512 struct idmap_defer_req *mdr =
513 container_of(dreq, struct idmap_defer_req, deferred_req);
514
515 wake_up(&mdr->waitq);
516 put_mdr(mdr);
517}
518
519static struct cache_deferred_req *
520idmap_defer(struct cache_req *req)
521{
522 struct idmap_defer_req *mdr =
523 container_of(req, struct idmap_defer_req, req);
524
525 mdr->deferred_req.revisit = idmap_revisit;
526 get_mdr(mdr);
527 return (&mdr->deferred_req);
528}
529
530static inline int
NeilBrownf9ecc922006-03-27 01:15:06 -0800531do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 struct cache_detail *detail, struct ent **item,
533 struct idmap_defer_req *mdr)
534{
NeilBrownf9ecc922006-03-27 01:15:06 -0800535 *item = lookup_fn(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 if (!*item)
537 return -ENOMEM;
538 return cache_check(detail, &(*item)->h, &mdr->req);
539}
540
541static inline int
NeilBrownf9ecc922006-03-27 01:15:06 -0800542do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 struct ent *key, struct cache_detail *detail,
544 struct ent **item)
545{
546 int ret = -ENOMEM;
547
NeilBrownf9ecc922006-03-27 01:15:06 -0800548 *item = lookup_fn(key);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 if (!*item)
550 goto out_err;
551 ret = -ETIMEDOUT;
552 if (!test_bit(CACHE_VALID, &(*item)->h.flags)
553 || (*item)->h.expiry_time < get_seconds()
554 || detail->flush_time > (*item)->h.last_refresh)
555 goto out_put;
556 ret = -ENOENT;
557 if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags))
558 goto out_put;
559 return 0;
560out_put:
NeilBrownbaab9352006-03-27 01:15:09 -0800561 cache_put(&(*item)->h, detail);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700562out_err:
563 *item = NULL;
564 return ret;
565}
566
567static int
568idmap_lookup(struct svc_rqst *rqstp,
NeilBrownf9ecc922006-03-27 01:15:06 -0800569 struct ent *(*lookup_fn)(struct ent *), struct ent *key,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 struct cache_detail *detail, struct ent **item)
571{
572 struct idmap_defer_req *mdr;
573 int ret;
574
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700575 mdr = kzalloc(sizeof(*mdr), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 if (!mdr)
577 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 atomic_set(&mdr->count, 1);
579 init_waitqueue_head(&mdr->waitq);
580 mdr->req.defer = idmap_defer;
581 ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr);
582 if (ret == -EAGAIN) {
583 wait_event_interruptible_timeout(mdr->waitq,
584 test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ);
585 ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item);
586 }
587 put_mdr(mdr);
588 return ret;
589}
590
591static int
592idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
593 uid_t *id)
594{
595 struct ent *item, key = {
596 .type = type,
597 };
598 int ret;
599
600 if (namelen + 1 > sizeof(key.name))
601 return -EINVAL;
602 memcpy(key.name, name, namelen);
603 key.name[namelen] = '\0';
604 strlcpy(key.authname, rqstp->rq_client->name, sizeof(key.authname));
605 ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item);
606 if (ret == -ENOENT)
607 ret = -ESRCH; /* nfserr_badname */
608 if (ret)
609 return ret;
610 *id = item->id;
NeilBrownbaab9352006-03-27 01:15:09 -0800611 cache_put(&item->h, &nametoid_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 return 0;
613}
614
615static int
616idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
617{
618 struct ent *item, key = {
619 .id = id,
620 .type = type,
621 };
622 int ret;
623
624 strlcpy(key.authname, rqstp->rq_client->name, sizeof(key.authname));
625 ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item);
626 if (ret == -ENOENT)
627 return sprintf(name, "%u", id);
628 if (ret)
629 return ret;
630 ret = strlen(item->name);
631 BUG_ON(ret > IDMAP_NAMESZ);
632 memcpy(name, item->name, ret);
NeilBrownbaab9352006-03-27 01:15:09 -0800633 cache_put(&item->h, &idtoname_cache);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 return ret;
635}
636
637int
638nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
639 __u32 *id)
640{
641 return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
642}
643
644int
645nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
646 __u32 *id)
647{
648 return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
649}
650
651int
652nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
653{
654 return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
655}
656
657int
658nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
659{
660 return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
661}