blob: bc3968fa81e53c1164b9ebb93c7f122303731143 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * fs/nfs/idmap.c
3 *
4 * UID and GID to name mapping for clients.
5 *
6 * Copyright (c) 2002 The Regents of the University of Michigan.
7 * 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 */
Trond Myklebust5cf36cf2011-02-22 15:44:31 -080036#include <linux/types.h>
Bryan Schumaker57e62322012-02-24 14:14:51 -050037#include <linux/parser.h>
38#include <linux/fs.h>
Vitaliy Ivanove44ba032011-06-20 16:08:07 +020039#include <linux/nfs_idmap.h>
Bryan Schumaker57e62322012-02-24 14:14:51 -050040#include <net/net_namespace.h>
Bryan Schumaker3cd0f372012-01-26 16:54:24 -050041#include <linux/sunrpc/rpc_pipe_fs.h>
Trond Myklebust6926afd2012-01-07 13:22:46 -050042#include <linux/nfs_fs.h>
Bryan Schumaker57e62322012-02-24 14:14:51 -050043#include <linux/nfs_fs_sb.h>
44#include <linux/key.h>
45#include <linux/keyctl.h>
46#include <linux/key-type.h>
47#include <keys/user-type.h>
48#include <linux/module.h>
49
Bryan Schumaker3cd0f372012-01-26 16:54:24 -050050#include "internal.h"
Stanislav Kinsbursky17347d02012-01-26 15:11:41 +040051#include "netns.h"
Bryan Schumaker3cd0f372012-01-26 16:54:24 -050052
53#define NFS_UINT_MAXLEN 11
Bryan Schumaker3cd0f372012-01-26 16:54:24 -050054
Trond Myklebust17280172012-03-11 13:11:00 -040055static const struct cred *id_resolver_cache;
56static struct key_type key_type_id_resolver_legacy;
Bryan Schumaker3cd0f372012-01-26 16:54:24 -050057
Bryan Schumakerc5066942012-08-09 14:05:49 -040058struct idmap_legacy_upcalldata {
59 struct rpc_pipe_msg pipe_msg;
60 struct idmap_msg idmap_msg;
Trond Myklebust0cac1202012-09-27 16:15:00 -040061 struct key_construction *key_cons;
Bryan Schumakerc5066942012-08-09 14:05:49 -040062 struct idmap *idmap;
63};
64
Trond Myklebust0cac1202012-09-27 16:15:00 -040065struct idmap {
66 struct rpc_pipe *idmap_pipe;
67 struct idmap_legacy_upcalldata *idmap_upcall_data;
68 struct mutex idmap_mutex;
69};
70
Trond Myklebust6926afd2012-01-07 13:22:46 -050071/**
72 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
73 * @fattr: fully initialised struct nfs_fattr
74 * @owner_name: owner name string cache
75 * @group_name: group name string cache
76 */
77void nfs_fattr_init_names(struct nfs_fattr *fattr,
78 struct nfs4_string *owner_name,
79 struct nfs4_string *group_name)
80{
81 fattr->owner_name = owner_name;
82 fattr->group_name = group_name;
83}
84
85static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
86{
87 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
88 kfree(fattr->owner_name->data);
89}
90
91static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
92{
93 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
94 kfree(fattr->group_name->data);
95}
96
97static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
98{
99 struct nfs4_string *owner = fattr->owner_name;
100 __u32 uid;
101
102 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
103 return false;
104 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
105 fattr->uid = uid;
106 fattr->valid |= NFS_ATTR_FATTR_OWNER;
107 }
108 return true;
109}
110
111static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
112{
113 struct nfs4_string *group = fattr->group_name;
114 __u32 gid;
115
116 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
117 return false;
118 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
119 fattr->gid = gid;
120 fattr->valid |= NFS_ATTR_FATTR_GROUP;
121 }
122 return true;
123}
124
125/**
126 * nfs_fattr_free_names - free up the NFSv4 owner and group strings
127 * @fattr: a fully initialised nfs_fattr structure
128 */
129void nfs_fattr_free_names(struct nfs_fattr *fattr)
130{
131 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
132 nfs_fattr_free_owner_name(fattr);
133 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
134 nfs_fattr_free_group_name(fattr);
135}
136
137/**
138 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
139 * @server: pointer to the filesystem nfs_server structure
140 * @fattr: a fully initialised nfs_fattr structure
141 *
142 * This helper maps the cached NFSv4 owner/group strings in fattr into
143 * their numeric uid/gid equivalents, and then frees the cached strings.
144 */
145void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
146{
147 if (nfs_fattr_map_owner_name(server, fattr))
148 nfs_fattr_free_owner_name(fattr);
149 if (nfs_fattr_map_group_name(server, fattr))
150 nfs_fattr_free_group_name(fattr);
151}
Trond Myklebust5cf36cf2011-02-22 15:44:31 -0800152
153static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
154{
155 unsigned long val;
156 char buf[16];
157
158 if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
159 return 0;
160 memcpy(buf, name, namelen);
161 buf[namelen] = '\0';
Daniel Walter7297cb62012-09-26 21:51:46 +0200162 if (kstrtoul(buf, 0, &val) != 0)
Trond Myklebust5cf36cf2011-02-22 15:44:31 -0800163 return 0;
164 *res = val;
165 return 1;
166}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167
Trond Myklebustf0b85162011-02-22 15:44:31 -0800168static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
169{
170 return snprintf(buf, buflen, "%u", id);
171}
172
Trond Myklebust17280172012-03-11 13:11:00 -0400173static struct key_type key_type_id_resolver = {
Bryan Schumaker955a8572010-09-29 15:41:49 -0400174 .name = "id_resolver",
175 .instantiate = user_instantiate,
176 .match = user_match,
177 .revoke = user_revoke,
178 .destroy = user_destroy,
179 .describe = user_describe,
180 .read = user_read,
181};
182
Bryan Schumakere6499c62012-01-26 16:54:23 -0500183static int nfs_idmap_init_keyring(void)
Bryan Schumaker955a8572010-09-29 15:41:49 -0400184{
185 struct cred *cred;
186 struct key *keyring;
187 int ret = 0;
188
Weston Andros Adamsonf9fd2d92012-01-26 13:32:22 -0500189 printk(KERN_NOTICE "NFS: Registering the %s key type\n",
190 key_type_id_resolver.name);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400191
192 cred = prepare_kernel_cred(NULL);
193 if (!cred)
194 return -ENOMEM;
195
David Howellsf8aa23a2012-10-02 19:24:56 +0100196 keyring = keyring_alloc(".id_resolver", 0, 0, cred,
197 (KEY_POS_ALL & ~KEY_POS_SETATTR) |
198 KEY_USR_VIEW | KEY_USR_READ,
199 KEY_ALLOC_NOT_IN_QUOTA, NULL);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400200 if (IS_ERR(keyring)) {
201 ret = PTR_ERR(keyring);
202 goto failed_put_cred;
203 }
204
Bryan Schumaker955a8572010-09-29 15:41:49 -0400205 ret = register_key_type(&key_type_id_resolver);
206 if (ret < 0)
207 goto failed_put_key;
208
David Howellsa427b9e2012-07-25 16:53:36 +0100209 ret = register_key_type(&key_type_id_resolver_legacy);
210 if (ret < 0)
211 goto failed_reg_legacy;
212
David Howells700920e2012-01-18 15:31:45 +0000213 set_bit(KEY_FLAG_ROOT_CAN_CLEAR, &keyring->flags);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400214 cred->thread_keyring = keyring;
215 cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
216 id_resolver_cache = cred;
217 return 0;
218
David Howellsa427b9e2012-07-25 16:53:36 +0100219failed_reg_legacy:
220 unregister_key_type(&key_type_id_resolver);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400221failed_put_key:
222 key_put(keyring);
223failed_put_cred:
224 put_cred(cred);
225 return ret;
226}
227
Bryan Schumakere6499c62012-01-26 16:54:23 -0500228static void nfs_idmap_quit_keyring(void)
Bryan Schumaker955a8572010-09-29 15:41:49 -0400229{
230 key_revoke(id_resolver_cache->thread_keyring);
231 unregister_key_type(&key_type_id_resolver);
David Howellsa427b9e2012-07-25 16:53:36 +0100232 unregister_key_type(&key_type_id_resolver_legacy);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400233 put_cred(id_resolver_cache);
234}
235
236/*
237 * Assemble the description to pass to request_key()
238 * This function will allocate a new string and update dest to point
239 * at it. The caller is responsible for freeing dest.
240 *
241 * On error 0 is returned. Otherwise, the length of dest is returned.
242 */
243static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
244 const char *type, size_t typelen, char **desc)
245{
246 char *cp;
247 size_t desclen = typelen + namelen + 2;
248
249 *desc = kmalloc(desclen, GFP_KERNEL);
Dan Carpenter8f0d97b2010-10-28 08:05:57 +0200250 if (!*desc)
Bryan Schumaker955a8572010-09-29 15:41:49 -0400251 return -ENOMEM;
252
253 cp = *desc;
254 memcpy(cp, type, typelen);
255 cp += typelen;
256 *cp++ = ':';
257
258 memcpy(cp, name, namelen);
259 cp += namelen;
260 *cp = '\0';
261 return desclen;
262}
263
Bryan Schumaker57e62322012-02-24 14:14:51 -0500264static ssize_t nfs_idmap_request_key(struct key_type *key_type,
265 const char *name, size_t namelen,
266 const char *type, void *data,
267 size_t data_size, struct idmap *idmap)
Bryan Schumaker955a8572010-09-29 15:41:49 -0400268{
269 const struct cred *saved_cred;
270 struct key *rkey;
271 char *desc;
272 struct user_key_payload *payload;
273 ssize_t ret;
274
275 ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
276 if (ret <= 0)
277 goto out;
278
279 saved_cred = override_creds(id_resolver_cache);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500280 if (idmap)
281 rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap);
282 else
283 rkey = request_key(&key_type_id_resolver, desc, "");
Bryan Schumaker955a8572010-09-29 15:41:49 -0400284 revert_creds(saved_cred);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500285
Bryan Schumaker955a8572010-09-29 15:41:49 -0400286 kfree(desc);
287 if (IS_ERR(rkey)) {
288 ret = PTR_ERR(rkey);
289 goto out;
290 }
291
292 rcu_read_lock();
293 rkey->perm |= KEY_USR_VIEW;
294
295 ret = key_validate(rkey);
296 if (ret < 0)
297 goto out_up;
298
299 payload = rcu_dereference(rkey->payload.data);
300 if (IS_ERR_OR_NULL(payload)) {
301 ret = PTR_ERR(payload);
302 goto out_up;
303 }
304
305 ret = payload->datalen;
306 if (ret > 0 && ret <= data_size)
307 memcpy(data, payload->data, ret);
308 else
309 ret = -EINVAL;
310
311out_up:
312 rcu_read_unlock();
313 key_put(rkey);
314out:
315 return ret;
316}
317
Bryan Schumaker57e62322012-02-24 14:14:51 -0500318static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
319 const char *type, void *data,
320 size_t data_size, struct idmap *idmap)
321{
322 ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver,
323 name, namelen, type, data,
324 data_size, NULL);
325 if (ret < 0) {
Bryan Schumakerb1027432012-06-20 14:35:28 -0400326 mutex_lock(&idmap->idmap_mutex);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500327 ret = nfs_idmap_request_key(&key_type_id_resolver_legacy,
328 name, namelen, type, data,
329 data_size, idmap);
Bryan Schumakerb1027432012-06-20 14:35:28 -0400330 mutex_unlock(&idmap->idmap_mutex);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500331 }
332 return ret;
333}
Bryan Schumaker955a8572010-09-29 15:41:49 -0400334
335/* ID -> Name */
Bryan Schumaker57e62322012-02-24 14:14:51 -0500336static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
337 size_t buflen, struct idmap *idmap)
Bryan Schumaker955a8572010-09-29 15:41:49 -0400338{
339 char id_str[NFS_UINT_MAXLEN];
340 int id_len;
341 ssize_t ret;
342
343 id_len = snprintf(id_str, sizeof(id_str), "%u", id);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500344 ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400345 if (ret < 0)
346 return -EINVAL;
347 return ret;
348}
349
350/* Name -> ID */
Bryan Schumaker57e62322012-02-24 14:14:51 -0500351static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
352 __u32 *id, struct idmap *idmap)
Bryan Schumaker955a8572010-09-29 15:41:49 -0400353{
354 char id_str[NFS_UINT_MAXLEN];
355 long id_long;
356 ssize_t data_size;
357 int ret = 0;
358
Bryan Schumaker57e62322012-02-24 14:14:51 -0500359 data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400360 if (data_size <= 0) {
361 ret = -EINVAL;
362 } else {
Daniel Walter7297cb62012-09-26 21:51:46 +0200363 ret = kstrtol(id_str, 10, &id_long);
Bryan Schumaker955a8572010-09-29 15:41:49 -0400364 *id = (__u32)id_long;
365 }
366 return ret;
367}
368
Bryan Schumakere6499c62012-01-26 16:54:23 -0500369/* idmap classic begins here */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370
Bryan Schumaker57e62322012-02-24 14:14:51 -0500371enum {
372 Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
373};
374
375static const match_table_t nfs_idmap_tokens = {
376 { Opt_find_uid, "uid:%s" },
377 { Opt_find_gid, "gid:%s" },
378 { Opt_find_user, "user:%s" },
379 { Opt_find_group, "group:%s" },
380 { Opt_find_err, NULL }
381};
382
383static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
Chuck Lever369af0f2007-12-20 14:54:35 -0500384static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
385 size_t);
Bryan Schumakerc5066942012-08-09 14:05:49 -0400386static void idmap_release_pipe(struct inode *);
Chuck Lever369af0f2007-12-20 14:54:35 -0500387static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388
Trond Myklebustb693ba42009-08-09 15:14:15 -0400389static const struct rpc_pipe_ops idmap_upcall_ops = {
Peng Taoc1225152011-09-22 21:50:10 -0400390 .upcall = rpc_pipe_generic_upcall,
Chuck Lever369af0f2007-12-20 14:54:35 -0500391 .downcall = idmap_pipe_downcall,
Bryan Schumakerc5066942012-08-09 14:05:49 -0400392 .release_pipe = idmap_release_pipe,
Chuck Lever369af0f2007-12-20 14:54:35 -0500393 .destroy_msg = idmap_pipe_destroy_msg,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394};
395
Trond Myklebust17280172012-03-11 13:11:00 -0400396static struct key_type key_type_id_resolver_legacy = {
David Howellsa427b9e2012-07-25 16:53:36 +0100397 .name = "id_legacy",
Bryan Schumaker57e62322012-02-24 14:14:51 -0500398 .instantiate = user_instantiate,
399 .match = user_match,
400 .revoke = user_revoke,
401 .destroy = user_destroy,
402 .describe = user_describe,
403 .read = user_read,
404 .request_key = nfs_idmap_legacy_upcall,
405};
406
Stanislav Kinsbursky4929d1d2012-01-10 16:13:11 +0400407static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
408{
409 if (pipe->dentry)
410 rpc_unlink(pipe->dentry);
411}
412
413static int __nfs_idmap_register(struct dentry *dir,
414 struct idmap *idmap,
415 struct rpc_pipe *pipe)
416{
417 struct dentry *dentry;
418
419 dentry = rpc_mkpipe_dentry(dir, "idmap", idmap, pipe);
420 if (IS_ERR(dentry))
421 return PTR_ERR(dentry);
422 pipe->dentry = dentry;
423 return 0;
424}
425
426static void nfs_idmap_unregister(struct nfs_client *clp,
427 struct rpc_pipe *pipe)
428{
Chuck Lever73ea6662012-05-21 22:44:50 -0400429 struct net *net = clp->cl_net;
Stanislav Kinsbursky4929d1d2012-01-10 16:13:11 +0400430 struct super_block *pipefs_sb;
431
432 pipefs_sb = rpc_get_sb_net(net);
433 if (pipefs_sb) {
434 __nfs_idmap_unregister(pipe);
435 rpc_put_sb_net(net);
436 }
437}
438
439static int nfs_idmap_register(struct nfs_client *clp,
440 struct idmap *idmap,
441 struct rpc_pipe *pipe)
442{
Chuck Lever73ea6662012-05-21 22:44:50 -0400443 struct net *net = clp->cl_net;
Stanislav Kinsbursky4929d1d2012-01-10 16:13:11 +0400444 struct super_block *pipefs_sb;
445 int err = 0;
446
447 pipefs_sb = rpc_get_sb_net(net);
448 if (pipefs_sb) {
449 if (clp->cl_rpcclient->cl_dentry)
450 err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
451 idmap, pipe);
452 rpc_put_sb_net(net);
453 }
454 return err;
455}
456
David Howellsb7162792006-08-22 20:06:09 -0400457int
David Howellsadfa6f92006-08-22 20:06:08 -0400458nfs_idmap_new(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
460 struct idmap *idmap;
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300461 struct rpc_pipe *pipe;
David Howellsb7162792006-08-22 20:06:09 -0400462 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463
Chuck Lever369af0f2007-12-20 14:54:35 -0500464 idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
465 if (idmap == NULL)
466 return -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300468 pipe = rpc_mkpipe_data(&idmap_upcall_ops, 0);
469 if (IS_ERR(pipe)) {
470 error = PTR_ERR(pipe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 kfree(idmap);
David Howellsb7162792006-08-22 20:06:09 -0400472 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 }
Stanislav Kinsbursky4929d1d2012-01-10 16:13:11 +0400474 error = nfs_idmap_register(clp, idmap, pipe);
475 if (error) {
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300476 rpc_destroy_pipe_data(pipe);
477 kfree(idmap);
478 return error;
479 }
480 idmap->idmap_pipe = pipe;
Bryan Schumakerb1027432012-06-20 14:35:28 -0400481 mutex_init(&idmap->idmap_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 clp->cl_idmap = idmap;
David Howellsb7162792006-08-22 20:06:09 -0400484 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485}
486
487void
David Howellsadfa6f92006-08-22 20:06:08 -0400488nfs_idmap_delete(struct nfs_client *clp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489{
490 struct idmap *idmap = clp->cl_idmap;
491
492 if (!idmap)
493 return;
Stanislav Kinsbursky4929d1d2012-01-10 16:13:11 +0400494 nfs_idmap_unregister(clp, idmap->idmap_pipe);
Stanislav Kinsburskyc239d832011-12-26 15:44:06 +0300495 rpc_destroy_pipe_data(idmap->idmap_pipe);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 clp->cl_idmap = NULL;
497 kfree(idmap);
498}
499
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400500static int __rpc_pipefs_event(struct nfs_client *clp, unsigned long event,
501 struct super_block *sb)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502{
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400503 int err = 0;
504
505 switch (event) {
506 case RPC_PIPEFS_MOUNT:
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400507 err = __nfs_idmap_register(clp->cl_rpcclient->cl_dentry,
508 clp->cl_idmap,
509 clp->cl_idmap->idmap_pipe);
510 break;
511 case RPC_PIPEFS_UMOUNT:
512 if (clp->cl_idmap->idmap_pipe) {
513 struct dentry *parent;
514
515 parent = clp->cl_idmap->idmap_pipe->dentry->d_parent;
516 __nfs_idmap_unregister(clp->cl_idmap->idmap_pipe);
517 /*
518 * Note: This is a dirty hack. SUNRPC hook has been
519 * called already but simple_rmdir() call for the
520 * directory returned with error because of idmap pipe
521 * inside. Thus now we have to remove this directory
522 * here.
523 */
524 if (rpc_rmdir(parent))
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500525 printk(KERN_ERR "NFS: %s: failed to remove "
526 "clnt dir!\n", __func__);
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400527 }
528 break;
529 default:
Weston Andros Adamsona0308892012-01-26 13:32:23 -0500530 printk(KERN_ERR "NFS: %s: unknown event: %ld\n", __func__,
531 event);
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400532 return -ENOTSUPP;
533 }
534 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535}
536
Stanislav Kinsburskye9dbca82012-02-27 22:05:37 +0400537static struct nfs_client *nfs_get_client_for_event(struct net *net, int event)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538{
Stanislav Kinsburskye9dbca82012-02-27 22:05:37 +0400539 struct nfs_net *nn = net_generic(net, nfs_net_id);
540 struct dentry *cl_dentry;
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400541 struct nfs_client *clp;
Trond Myklebust4697bd52012-05-23 13:24:36 -0400542 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543
Trond Myklebust4697bd52012-05-23 13:24:36 -0400544restart:
Stanislav Kinsburskydc030852012-01-23 17:26:31 +0000545 spin_lock(&nn->nfs_client_lock);
Stanislav Kinsbursky6b131682012-01-23 17:26:05 +0000546 list_for_each_entry(clp, &nn->nfs_client_list, cl_share_link) {
Trond Myklebust4697bd52012-05-23 13:24:36 -0400547 /* Wait for initialisation to finish */
548 if (clp->cl_cons_state == NFS_CS_INITING) {
549 atomic_inc(&clp->cl_count);
550 spin_unlock(&nn->nfs_client_lock);
551 err = nfs_wait_client_init_complete(clp);
552 nfs_put_client(clp);
553 if (err)
554 return NULL;
555 goto restart;
556 }
557 /* Skip nfs_clients that failed to initialise */
558 if (clp->cl_cons_state < 0)
559 continue;
Trond Myklebust54ac4712012-05-23 13:26:10 -0400560 smp_rmb();
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400561 if (clp->rpc_ops != &nfs_v4_clientops)
562 continue;
Stanislav Kinsburskye9dbca82012-02-27 22:05:37 +0400563 cl_dentry = clp->cl_idmap->idmap_pipe->dentry;
564 if (((event == RPC_PIPEFS_MOUNT) && cl_dentry) ||
565 ((event == RPC_PIPEFS_UMOUNT) && !cl_dentry))
566 continue;
567 atomic_inc(&clp->cl_count);
568 spin_unlock(&nn->nfs_client_lock);
569 return clp;
570 }
571 spin_unlock(&nn->nfs_client_lock);
572 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573}
574
Stanislav Kinsburskye9dbca82012-02-27 22:05:37 +0400575static int rpc_pipefs_event(struct notifier_block *nb, unsigned long event,
576 void *ptr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577{
Stanislav Kinsburskye9dbca82012-02-27 22:05:37 +0400578 struct super_block *sb = ptr;
579 struct nfs_client *clp;
580 int error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
Stanislav Kinsbursky71dfc5f2012-04-28 19:32:21 +0400582 if (!try_module_get(THIS_MODULE))
583 return 0;
584
Stanislav Kinsburskye9dbca82012-02-27 22:05:37 +0400585 while ((clp = nfs_get_client_for_event(sb->s_fs_info, event))) {
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400586 error = __rpc_pipefs_event(clp, event, sb);
Stanislav Kinsburskye9dbca82012-02-27 22:05:37 +0400587 nfs_put_client(clp);
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400588 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700589 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 }
Stanislav Kinsbursky71dfc5f2012-04-28 19:32:21 +0400591 module_put(THIS_MODULE);
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400592 return error;
593}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400595#define PIPEFS_NFS_PRIO 1
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400597static struct notifier_block nfs_idmap_block = {
598 .notifier_call = rpc_pipefs_event,
599 .priority = SUNRPC_PIPEFS_NFS_PRIO,
600};
601
602int nfs_idmap_init(void)
603{
Bryan Schumakere6499c62012-01-26 16:54:23 -0500604 int ret;
605 ret = nfs_idmap_init_keyring();
606 if (ret != 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 goto out;
Bryan Schumakere6499c62012-01-26 16:54:23 -0500608 ret = rpc_pipefs_notifier_register(&nfs_idmap_block);
609 if (ret != 0)
610 nfs_idmap_quit_keyring();
611out:
Chuck Lever369af0f2007-12-20 14:54:35 -0500612 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613}
614
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400615void nfs_idmap_quit(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616{
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400617 rpc_pipefs_notifier_unregister(&nfs_idmap_block);
Bryan Schumakere6499c62012-01-26 16:54:23 -0500618 nfs_idmap_quit_keyring();
Stanislav Kinsburskyeee17322012-01-10 16:13:19 +0400619}
620
Bryan Schumakerc5066942012-08-09 14:05:49 -0400621static int nfs_idmap_prepare_message(char *desc, struct idmap *idmap,
622 struct idmap_msg *im,
Bryan Schumaker57e62322012-02-24 14:14:51 -0500623 struct rpc_pipe_msg *msg)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624{
Bryan Schumaker57e62322012-02-24 14:14:51 -0500625 substring_t substr;
626 int token, ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627
Bryan Schumaker57e62322012-02-24 14:14:51 -0500628 im->im_type = IDMAP_TYPE_GROUP;
629 token = match_token(desc, nfs_idmap_tokens, &substr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Bryan Schumaker57e62322012-02-24 14:14:51 -0500631 switch (token) {
632 case Opt_find_uid:
633 im->im_type = IDMAP_TYPE_USER;
634 case Opt_find_gid:
635 im->im_conv = IDMAP_CONV_NAMETOID;
636 ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
637 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
Bryan Schumaker57e62322012-02-24 14:14:51 -0500639 case Opt_find_user:
640 im->im_type = IDMAP_TYPE_USER;
641 case Opt_find_group:
642 im->im_conv = IDMAP_CONV_IDTONAME;
643 ret = match_int(&substr, &im->im_id);
644 break;
Trond Myklebust685f50f2012-02-08 13:39:15 -0500645
Bryan Schumaker57e62322012-02-24 14:14:51 -0500646 default:
647 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648 goto out;
649 }
650
Bryan Schumaker57e62322012-02-24 14:14:51 -0500651 msg->data = im;
652 msg->len = sizeof(struct idmap_msg);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653
Bryan Schumaker57e62322012-02-24 14:14:51 -0500654out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 return ret;
656}
657
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400658static bool
659nfs_idmap_prepare_pipe_upcall(struct idmap *idmap,
Trond Myklebust0cac1202012-09-27 16:15:00 -0400660 struct idmap_legacy_upcalldata *data)
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400661{
Trond Myklebust0cac1202012-09-27 16:15:00 -0400662 if (idmap->idmap_upcall_data != NULL) {
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400663 WARN_ON_ONCE(1);
664 return false;
665 }
Trond Myklebust0cac1202012-09-27 16:15:00 -0400666 idmap->idmap_upcall_data = data;
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400667 return true;
668}
669
670static void
671nfs_idmap_complete_pipe_upcall_locked(struct idmap *idmap, int ret)
672{
Trond Myklebust0cac1202012-09-27 16:15:00 -0400673 struct key_construction *cons = idmap->idmap_upcall_data->key_cons;
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400674
Trond Myklebust0cac1202012-09-27 16:15:00 -0400675 kfree(idmap->idmap_upcall_data);
676 idmap->idmap_upcall_data = NULL;
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400677 complete_request_key(cons, ret);
678}
679
680static void
681nfs_idmap_abort_pipe_upcall(struct idmap *idmap, int ret)
682{
Trond Myklebust0cac1202012-09-27 16:15:00 -0400683 if (idmap->idmap_upcall_data != NULL)
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400684 nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
685}
686
Bryan Schumaker57e62322012-02-24 14:14:51 -0500687static int nfs_idmap_legacy_upcall(struct key_construction *cons,
688 const char *op,
689 void *aux)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690{
Bryan Schumakerc5066942012-08-09 14:05:49 -0400691 struct idmap_legacy_upcalldata *data;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500692 struct rpc_pipe_msg *msg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 struct idmap_msg *im;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500694 struct idmap *idmap = (struct idmap *)aux;
695 struct key *key = cons->key;
Dan Carpenter5abc03c2012-05-14 22:45:28 +0300696 int ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700697
Bryan Schumaker57e62322012-02-24 14:14:51 -0500698 /* msg and im are freed in idmap_pipe_destroy_msg */
Bryan Schumaker57a51042012-08-09 14:05:51 -0400699 data = kzalloc(sizeof(*data), GFP_KERNEL);
Bryan Schumakerc5066942012-08-09 14:05:49 -0400700 if (!data)
Bryan Schumaker57e62322012-02-24 14:14:51 -0500701 goto out1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Bryan Schumakerc5066942012-08-09 14:05:49 -0400703 msg = &data->pipe_msg;
704 im = &data->idmap_msg;
705 data->idmap = idmap;
Bryan Schumakerddfc4e12012-10-02 16:01:38 -0400706 data->key_cons = cons;
Bryan Schumakerc5066942012-08-09 14:05:49 -0400707
708 ret = nfs_idmap_prepare_message(key->description, idmap, im, msg);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500709 if (ret < 0)
710 goto out2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400712 ret = -EAGAIN;
Trond Myklebust0cac1202012-09-27 16:15:00 -0400713 if (!nfs_idmap_prepare_pipe_upcall(idmap, data))
Trond Myklebust0e24d842012-09-28 12:03:09 -0400714 goto out2;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500715
Bryan Schumaker11588f42012-03-12 11:33:00 -0400716 ret = rpc_queue_upcall(idmap->idmap_pipe, msg);
717 if (ret < 0)
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400718 nfs_idmap_abort_pipe_upcall(idmap, ret);
Bryan Schumaker11588f42012-03-12 11:33:00 -0400719
720 return ret;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500721out2:
Bryan Schumakerc5066942012-08-09 14:05:49 -0400722 kfree(data);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500723out1:
David Howellsa427b9e2012-07-25 16:53:36 +0100724 complete_request_key(cons, ret);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500725 return ret;
726}
727
728static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data)
729{
730 return key_instantiate_and_link(key, data, strlen(data) + 1,
731 id_resolver_cache->thread_keyring,
732 authkey);
733}
734
Trond Myklebust0cac1202012-09-27 16:15:00 -0400735static int nfs_idmap_read_and_verify_message(struct idmap_msg *im,
736 struct idmap_msg *upcall,
737 struct key *key, struct key *authkey)
Bryan Schumaker57e62322012-02-24 14:14:51 -0500738{
739 char id_str[NFS_UINT_MAXLEN];
Trond Myklebust0cac1202012-09-27 16:15:00 -0400740 int ret = -ENOKEY;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500741
Trond Myklebust0cac1202012-09-27 16:15:00 -0400742 /* ret = -ENOKEY */
743 if (upcall->im_type != im->im_type || upcall->im_conv != im->im_conv)
744 goto out;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500745 switch (im->im_conv) {
746 case IDMAP_CONV_NAMETOID:
Trond Myklebust0cac1202012-09-27 16:15:00 -0400747 if (strcmp(upcall->im_name, im->im_name) != 0)
748 break;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500749 sprintf(id_str, "%d", im->im_id);
750 ret = nfs_idmap_instantiate(key, authkey, id_str);
751 break;
752 case IDMAP_CONV_IDTONAME:
Trond Myklebust0cac1202012-09-27 16:15:00 -0400753 if (upcall->im_id != im->im_id)
754 break;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500755 ret = nfs_idmap_instantiate(key, authkey, im->im_name);
756 break;
Trond Myklebust0cac1202012-09-27 16:15:00 -0400757 default:
758 ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759 }
Trond Myklebust0cac1202012-09-27 16:15:00 -0400760out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 return ret;
762}
763
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764static ssize_t
765idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
766{
Chuck Lever369af0f2007-12-20 14:54:35 -0500767 struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700768 struct idmap *idmap = (struct idmap *)rpci->private;
David Howellsa427b9e2012-07-25 16:53:36 +0100769 struct key_construction *cons;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500770 struct idmap_msg im;
Chuck Leverd24aae42007-12-20 14:54:49 -0500771 size_t namelen_in;
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400772 int ret = -ENOKEY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
David Howellsa427b9e2012-07-25 16:53:36 +0100774 /* If instantiation is successful, anyone waiting for key construction
775 * will have been woken up and someone else may now have used
776 * idmap_key_cons - so after this point we may no longer touch it.
777 */
Trond Myklebust0cac1202012-09-27 16:15:00 -0400778 if (idmap->idmap_upcall_data == NULL)
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400779 goto out_noupcall;
David Howellsa427b9e2012-07-25 16:53:36 +0100780
Trond Myklebust0cac1202012-09-27 16:15:00 -0400781 cons = idmap->idmap_upcall_data->key_cons;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
Bryan Schumaker57e62322012-02-24 14:14:51 -0500783 if (mlen != sizeof(im)) {
784 ret = -ENOSPC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700785 goto out;
786 }
787
Bryan Schumaker57e62322012-02-24 14:14:51 -0500788 if (copy_from_user(&im, src, mlen) != 0) {
789 ret = -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 goto out;
791 }
792
Bryan Schumaker57e62322012-02-24 14:14:51 -0500793 if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
Bryan Schumaker12dfd082012-08-09 14:05:50 -0400794 ret = -ENOKEY;
795 goto out;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500796 }
797
798 namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
799 if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
800 ret = -EINVAL;
801 goto out;
Trond Myklebust0cac1202012-09-27 16:15:00 -0400802}
Bryan Schumaker57e62322012-02-24 14:14:51 -0500803
Trond Myklebust0cac1202012-09-27 16:15:00 -0400804 ret = nfs_idmap_read_and_verify_message(&im,
805 &idmap->idmap_upcall_data->idmap_msg,
806 cons->key, cons->authkey);
Bryan Schumaker57e62322012-02-24 14:14:51 -0500807 if (ret >= 0) {
808 key_set_timeout(cons->key, nfs_idmap_cache_timeout);
809 ret = mlen;
810 }
811
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812out:
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400813 nfs_idmap_complete_pipe_upcall_locked(idmap, ret);
814out_noupcall:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 return ret;
816}
817
Adrian Bunk75c96f82005-05-05 16:16:09 -0700818static void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
820{
Bryan Schumakerc5066942012-08-09 14:05:49 -0400821 struct idmap_legacy_upcalldata *data = container_of(msg,
822 struct idmap_legacy_upcalldata,
823 pipe_msg);
824 struct idmap *idmap = data->idmap;
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400825
826 if (msg->errno)
827 nfs_idmap_abort_pipe_upcall(idmap, msg->errno);
Bryan Schumakerc5066942012-08-09 14:05:49 -0400828}
829
830static void
831idmap_release_pipe(struct inode *inode)
832{
833 struct rpc_inode *rpci = RPC_I(inode);
834 struct idmap *idmap = (struct idmap *)rpci->private;
Trond Myklebuste9ab41b62012-09-27 15:44:19 -0400835
836 nfs_idmap_abort_pipe_upcall(idmap, -EPIPE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700837}
838
Trond Myklebuste4fd72a2011-02-22 15:44:31 -0800839int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840{
Trond Myklebuste4fd72a2011-02-22 15:44:31 -0800841 struct idmap *idmap = server->nfs_client->cl_idmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842
Trond Myklebust5cf36cf2011-02-22 15:44:31 -0800843 if (nfs_map_string_to_numeric(name, namelen, uid))
844 return 0;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500845 return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846}
847
Bryan Schumakere6499c62012-01-26 16:54:23 -0500848int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700849{
Trond Myklebuste4fd72a2011-02-22 15:44:31 -0800850 struct idmap *idmap = server->nfs_client->cl_idmap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851
Bryan Schumakere6499c62012-01-26 16:54:23 -0500852 if (nfs_map_string_to_numeric(name, namelen, gid))
Trond Myklebust5cf36cf2011-02-22 15:44:31 -0800853 return 0;
Bryan Schumaker57e62322012-02-24 14:14:51 -0500854 return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855}
856
Trond Myklebuste4fd72a2011-02-22 15:44:31 -0800857int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858{
Trond Myklebuste4fd72a2011-02-22 15:44:31 -0800859 struct idmap *idmap = server->nfs_client->cl_idmap;
Trond Myklebustb064eca22011-02-22 15:44:32 -0800860 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
Trond Myklebustb064eca22011-02-22 15:44:32 -0800862 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
Bryan Schumaker57e62322012-02-24 14:14:51 -0500863 ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap);
Trond Myklebustf0b85162011-02-22 15:44:31 -0800864 if (ret < 0)
865 ret = nfs_map_numeric_to_string(uid, buf, buflen);
866 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867}
Bryan Schumakere6499c62012-01-26 16:54:23 -0500868int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869{
Trond Myklebuste4fd72a2011-02-22 15:44:31 -0800870 struct idmap *idmap = server->nfs_client->cl_idmap;
Trond Myklebustb064eca22011-02-22 15:44:32 -0800871 int ret = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Trond Myklebustb064eca22011-02-22 15:44:32 -0800873 if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
Bryan Schumaker57e62322012-02-24 14:14:51 -0500874 ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap);
Trond Myklebustf0b85162011-02-22 15:44:31 -0800875 if (ret < 0)
Bryan Schumakere6499c62012-01-26 16:54:23 -0500876 ret = nfs_map_numeric_to_string(gid, buf, buflen);
Trond Myklebustf0b85162011-02-22 15:44:31 -0800877 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700878}