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Linux/fs/nfs/idmap.c

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  1 /*
  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  */
 36 #include <linux/types.h>
 37 #include <linux/string.h>
 38 #include <linux/kernel.h>
 39 #include <linux/slab.h>
 40 #include <linux/nfs_idmap.h>
 41 
 42 static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
 43 {
 44         unsigned long val;
 45         char buf[16];
 46 
 47         if (memchr(name, '@', namelen) != NULL || namelen >= sizeof(buf))
 48                 return 0;
 49         memcpy(buf, name, namelen);
 50         buf[namelen] = '\0';
 51         if (strict_strtoul(buf, 0, &val) != 0)
 52                 return 0;
 53         *res = val;
 54         return 1;
 55 }
 56 
 57 static int nfs_map_numeric_to_string(__u32 id, char *buf, size_t buflen)
 58 {
 59         return snprintf(buf, buflen, "%u", id);
 60 }
 61 
 62 #ifdef CONFIG_NFS_USE_NEW_IDMAPPER
 63 
 64 #include <linux/cred.h>
 65 #include <linux/sunrpc/sched.h>
 66 #include <linux/nfs4.h>
 67 #include <linux/nfs_fs_sb.h>
 68 #include <linux/keyctl.h>
 69 #include <linux/key-type.h>
 70 #include <linux/rcupdate.h>
 71 #include <linux/err.h>
 72 
 73 #include <keys/user-type.h>
 74 
 75 #define NFS_UINT_MAXLEN 11
 76 
 77 const struct cred *id_resolver_cache;
 78 
 79 struct key_type key_type_id_resolver = {
 80         .name           = "id_resolver",
 81         .instantiate    = user_instantiate,
 82         .match          = user_match,
 83         .revoke         = user_revoke,
 84         .destroy        = user_destroy,
 85         .describe       = user_describe,
 86         .read           = user_read,
 87 };
 88 
 89 int nfs_idmap_init(void)
 90 {
 91         struct cred *cred;
 92         struct key *keyring;
 93         int ret = 0;
 94 
 95         printk(KERN_NOTICE "Registering the %s key type\n", key_type_id_resolver.name);
 96 
 97         cred = prepare_kernel_cred(NULL);
 98         if (!cred)
 99                 return -ENOMEM;
100 
101         keyring = key_alloc(&key_type_keyring, ".id_resolver", 0, 0, cred,
102                              (KEY_POS_ALL & ~KEY_POS_SETATTR) |
103                              KEY_USR_VIEW | KEY_USR_READ,
104                              KEY_ALLOC_NOT_IN_QUOTA);
105         if (IS_ERR(keyring)) {
106                 ret = PTR_ERR(keyring);
107                 goto failed_put_cred;
108         }
109 
110         ret = key_instantiate_and_link(keyring, NULL, 0, NULL, NULL);
111         if (ret < 0)
112                 goto failed_put_key;
113 
114         ret = register_key_type(&key_type_id_resolver);
115         if (ret < 0)
116                 goto failed_put_key;
117 
118         cred->thread_keyring = keyring;
119         cred->jit_keyring = KEY_REQKEY_DEFL_THREAD_KEYRING;
120         id_resolver_cache = cred;
121         return 0;
122 
123 failed_put_key:
124         key_put(keyring);
125 failed_put_cred:
126         put_cred(cred);
127         return ret;
128 }
129 
130 void nfs_idmap_quit(void)
131 {
132         key_revoke(id_resolver_cache->thread_keyring);
133         unregister_key_type(&key_type_id_resolver);
134         put_cred(id_resolver_cache);
135 }
136 
137 /*
138  * Assemble the description to pass to request_key()
139  * This function will allocate a new string and update dest to point
140  * at it.  The caller is responsible for freeing dest.
141  *
142  * On error 0 is returned.  Otherwise, the length of dest is returned.
143  */
144 static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
145                                 const char *type, size_t typelen, char **desc)
146 {
147         char *cp;
148         size_t desclen = typelen + namelen + 2;
149 
150         *desc = kmalloc(desclen, GFP_KERNEL);
151         if (!*desc)
152                 return -ENOMEM;
153 
154         cp = *desc;
155         memcpy(cp, type, typelen);
156         cp += typelen;
157         *cp++ = ':';
158 
159         memcpy(cp, name, namelen);
160         cp += namelen;
161         *cp = '\0';
162         return desclen;
163 }
164 
165 static ssize_t nfs_idmap_request_key(const char *name, size_t namelen,
166                 const char *type, void *data, size_t data_size)
167 {
168         const struct cred *saved_cred;
169         struct key *rkey;
170         char *desc;
171         struct user_key_payload *payload;
172         ssize_t ret;
173 
174         ret = nfs_idmap_get_desc(name, namelen, type, strlen(type), &desc);
175         if (ret <= 0)
176                 goto out;
177 
178         saved_cred = override_creds(id_resolver_cache);
179         rkey = request_key(&key_type_id_resolver, desc, "");
180         revert_creds(saved_cred);
181         kfree(desc);
182         if (IS_ERR(rkey)) {
183                 ret = PTR_ERR(rkey);
184                 goto out;
185         }
186 
187         rcu_read_lock();
188         rkey->perm |= KEY_USR_VIEW;
189 
190         ret = key_validate(rkey);
191         if (ret < 0)
192                 goto out_up;
193 
194         payload = rcu_dereference(rkey->payload.data);
195         if (IS_ERR_OR_NULL(payload)) {
196                 ret = PTR_ERR(payload);
197                 goto out_up;
198         }
199 
200         ret = payload->datalen;
201         if (ret > 0 && ret <= data_size)
202                 memcpy(data, payload->data, ret);
203         else
204                 ret = -EINVAL;
205 
206 out_up:
207         rcu_read_unlock();
208         key_put(rkey);
209 out:
210         return ret;
211 }
212 
213 
214 /* ID -> Name */
215 static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, size_t buflen)
216 {
217         char id_str[NFS_UINT_MAXLEN];
218         int id_len;
219         ssize_t ret;
220 
221         id_len = snprintf(id_str, sizeof(id_str), "%u", id);
222         ret = nfs_idmap_request_key(id_str, id_len, type, buf, buflen);
223         if (ret < 0)
224                 return -EINVAL;
225         return ret;
226 }
227 
228 /* Name -> ID */
229 static int nfs_idmap_lookup_id(const char *name, size_t namelen,
230                                 const char *type, __u32 *id)
231 {
232         char id_str[NFS_UINT_MAXLEN];
233         long id_long;
234         ssize_t data_size;
235         int ret = 0;
236 
237         data_size = nfs_idmap_request_key(name, namelen, type, id_str, NFS_UINT_MAXLEN);
238         if (data_size <= 0) {
239                 ret = -EINVAL;
240         } else {
241                 ret = strict_strtol(id_str, 10, &id_long);
242                 *id = (__u32)id_long;
243         }
244         return ret;
245 }
246 
247 int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
248 {
249         if (nfs_map_string_to_numeric(name, namelen, uid))
250                 return 0;
251         return nfs_idmap_lookup_id(name, namelen, "uid", uid);
252 }
253 
254 int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid)
255 {
256         if (nfs_map_string_to_numeric(name, namelen, gid))
257                 return 0;
258         return nfs_idmap_lookup_id(name, namelen, "gid", gid);
259 }
260 
261 int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
262 {
263         int ret = -EINVAL;
264 
265         if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
266                 ret = nfs_idmap_lookup_name(uid, "user", buf, buflen);
267         if (ret < 0)
268                 ret = nfs_map_numeric_to_string(uid, buf, buflen);
269         return ret;
270 }
271 int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf, size_t buflen)
272 {
273         int ret = -EINVAL;
274 
275         if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
276                 ret = nfs_idmap_lookup_name(gid, "group", buf, buflen);
277         if (ret < 0)
278                 ret = nfs_map_numeric_to_string(gid, buf, buflen);
279         return ret;
280 }
281 
282 #else  /* CONFIG_NFS_USE_NEW_IDMAPPER not defined */
283 
284 #include <linux/module.h>
285 #include <linux/mutex.h>
286 #include <linux/init.h>
287 #include <linux/socket.h>
288 #include <linux/in.h>
289 #include <linux/sched.h>
290 #include <linux/sunrpc/clnt.h>
291 #include <linux/workqueue.h>
292 #include <linux/sunrpc/rpc_pipe_fs.h>
293 
294 #include <linux/nfs_fs.h>
295 
296 #include "nfs4_fs.h"
297 
298 #define IDMAP_HASH_SZ          128
299 
300 /* Default cache timeout is 10 minutes */
301 unsigned int nfs_idmap_cache_timeout = 600 * HZ;
302 
303 static int param_set_idmap_timeout(const char *val, struct kernel_param *kp)
304 {
305         char *endp;
306         int num = simple_strtol(val, &endp, 0);
307         int jif = num * HZ;
308         if (endp == val || *endp || num < 0 || jif < num)
309                 return -EINVAL;
310         *((int *)kp->arg) = jif;
311         return 0;
312 }
313 
314 module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
315                  &nfs_idmap_cache_timeout, 0644);
316 
317 struct idmap_hashent {
318         unsigned long           ih_expires;
319         __u32                   ih_id;
320         size_t                  ih_namelen;
321         const char              *ih_name;
322 };
323 
324 struct idmap_hashtable {
325         __u8                    h_type;
326         struct idmap_hashent    *h_entries;
327 };
328 
329 struct idmap {
330         struct dentry           *idmap_dentry;
331         wait_queue_head_t       idmap_wq;
332         struct idmap_msg        idmap_im;
333         struct mutex            idmap_lock;     /* Serializes upcalls */
334         struct mutex            idmap_im_lock;  /* Protects the hashtable */
335         struct idmap_hashtable  idmap_user_hash;
336         struct idmap_hashtable  idmap_group_hash;
337 };
338 
339 static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
340                                    size_t);
341 static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
342 
343 static unsigned int fnvhash32(const void *, size_t);
344 
345 static const struct rpc_pipe_ops idmap_upcall_ops = {
346         .upcall         = rpc_pipe_generic_upcall,
347         .downcall       = idmap_pipe_downcall,
348         .destroy_msg    = idmap_pipe_destroy_msg,
349 };
350 
351 int
352 nfs_idmap_new(struct nfs_client *clp)
353 {
354         struct idmap *idmap;
355         int error;
356 
357         BUG_ON(clp->cl_idmap != NULL);
358 
359         idmap = kzalloc(sizeof(*idmap), GFP_KERNEL);
360         if (idmap == NULL)
361                 return -ENOMEM;
362 
363         idmap->idmap_dentry = rpc_mkpipe(clp->cl_rpcclient->cl_path.dentry,
364                         "idmap", idmap, &idmap_upcall_ops, 0);
365         if (IS_ERR(idmap->idmap_dentry)) {
366                 error = PTR_ERR(idmap->idmap_dentry);
367                 kfree(idmap);
368                 return error;
369         }
370 
371         mutex_init(&idmap->idmap_lock);
372         mutex_init(&idmap->idmap_im_lock);
373         init_waitqueue_head(&idmap->idmap_wq);
374         idmap->idmap_user_hash.h_type = IDMAP_TYPE_USER;
375         idmap->idmap_group_hash.h_type = IDMAP_TYPE_GROUP;
376 
377         clp->cl_idmap = idmap;
378         return 0;
379 }
380 
381 static void
382 idmap_alloc_hashtable(struct idmap_hashtable *h)
383 {
384         if (h->h_entries != NULL)
385                 return;
386         h->h_entries = kcalloc(IDMAP_HASH_SZ,
387                         sizeof(*h->h_entries),
388                         GFP_KERNEL);
389 }
390 
391 static void
392 idmap_free_hashtable(struct idmap_hashtable *h)
393 {
394         int i;
395 
396         if (h->h_entries == NULL)
397                 return;
398         for (i = 0; i < IDMAP_HASH_SZ; i++)
399                 kfree(h->h_entries[i].ih_name);
400         kfree(h->h_entries);
401 }
402 
403 void
404 nfs_idmap_delete(struct nfs_client *clp)
405 {
406         struct idmap *idmap = clp->cl_idmap;
407 
408         if (!idmap)
409                 return;
410         rpc_unlink(idmap->idmap_dentry);
411         clp->cl_idmap = NULL;
412         idmap_free_hashtable(&idmap->idmap_user_hash);
413         idmap_free_hashtable(&idmap->idmap_group_hash);
414         kfree(idmap);
415 }
416 
417 /*
418  * Helper routines for manipulating the hashtable
419  */
420 static inline struct idmap_hashent *
421 idmap_name_hash(struct idmap_hashtable* h, const char *name, size_t len)
422 {
423         if (h->h_entries == NULL)
424                 return NULL;
425         return &h->h_entries[fnvhash32(name, len) % IDMAP_HASH_SZ];
426 }
427 
428 static struct idmap_hashent *
429 idmap_lookup_name(struct idmap_hashtable *h, const char *name, size_t len)
430 {
431         struct idmap_hashent *he = idmap_name_hash(h, name, len);
432 
433         if (he == NULL)
434                 return NULL;
435         if (he->ih_namelen != len || memcmp(he->ih_name, name, len) != 0)
436                 return NULL;
437         if (time_after(jiffies, he->ih_expires))
438                 return NULL;
439         return he;
440 }
441 
442 static inline struct idmap_hashent *
443 idmap_id_hash(struct idmap_hashtable* h, __u32 id)
444 {
445         if (h->h_entries == NULL)
446                 return NULL;
447         return &h->h_entries[fnvhash32(&id, sizeof(id)) % IDMAP_HASH_SZ];
448 }
449 
450 static struct idmap_hashent *
451 idmap_lookup_id(struct idmap_hashtable *h, __u32 id)
452 {
453         struct idmap_hashent *he = idmap_id_hash(h, id);
454 
455         if (he == NULL)
456                 return NULL;
457         if (he->ih_id != id || he->ih_namelen == 0)
458                 return NULL;
459         if (time_after(jiffies, he->ih_expires))
460                 return NULL;
461         return he;
462 }
463 
464 /*
465  * Routines for allocating new entries in the hashtable.
466  * For now, we just have 1 entry per bucket, so it's all
467  * pretty trivial.
468  */
469 static inline struct idmap_hashent *
470 idmap_alloc_name(struct idmap_hashtable *h, char *name, size_t len)
471 {
472         idmap_alloc_hashtable(h);
473         return idmap_name_hash(h, name, len);
474 }
475 
476 static inline struct idmap_hashent *
477 idmap_alloc_id(struct idmap_hashtable *h, __u32 id)
478 {
479         idmap_alloc_hashtable(h);
480         return idmap_id_hash(h, id);
481 }
482 
483 static void
484 idmap_update_entry(struct idmap_hashent *he, const char *name,
485                 size_t namelen, __u32 id)
486 {
487         char *str = kmalloc(namelen + 1, GFP_KERNEL);
488         if (str == NULL)
489                 return;
490         kfree(he->ih_name);
491         he->ih_id = id;
492         memcpy(str, name, namelen);
493         str[namelen] = '\0';
494         he->ih_name = str;
495         he->ih_namelen = namelen;
496         he->ih_expires = jiffies + nfs_idmap_cache_timeout;
497 }
498 
499 /*
500  * Name -> ID
501  */
502 static int
503 nfs_idmap_id(struct idmap *idmap, struct idmap_hashtable *h,
504                 const char *name, size_t namelen, __u32 *id)
505 {
506         struct rpc_pipe_msg msg;
507         struct idmap_msg *im;
508         struct idmap_hashent *he;
509         DECLARE_WAITQUEUE(wq, current);
510         int ret = -EIO;
511 
512         im = &idmap->idmap_im;
513 
514         /*
515          * String sanity checks
516          * Note that the userland daemon expects NUL terminated strings
517          */
518         for (;;) {
519                 if (namelen == 0)
520                         return -EINVAL;
521                 if (name[namelen-1] != '\0')
522                         break;
523                 namelen--;
524         }
525         if (namelen >= IDMAP_NAMESZ)
526                 return -EINVAL;
527 
528         mutex_lock(&idmap->idmap_lock);
529         mutex_lock(&idmap->idmap_im_lock);
530 
531         he = idmap_lookup_name(h, name, namelen);
532         if (he != NULL) {
533                 *id = he->ih_id;
534                 ret = 0;
535                 goto out;
536         }
537 
538         memset(im, 0, sizeof(*im));
539         memcpy(im->im_name, name, namelen);
540 
541         im->im_type = h->h_type;
542         im->im_conv = IDMAP_CONV_NAMETOID;
543 
544         memset(&msg, 0, sizeof(msg));
545         msg.data = im;
546         msg.len = sizeof(*im);
547 
548         add_wait_queue(&idmap->idmap_wq, &wq);
549         if (rpc_queue_upcall(idmap->idmap_dentry->d_inode, &msg) < 0) {
550                 remove_wait_queue(&idmap->idmap_wq, &wq);
551                 goto out;
552         }
553 
554         set_current_state(TASK_UNINTERRUPTIBLE);
555         mutex_unlock(&idmap->idmap_im_lock);
556         schedule();
557         __set_current_state(TASK_RUNNING);
558         remove_wait_queue(&idmap->idmap_wq, &wq);
559         mutex_lock(&idmap->idmap_im_lock);
560 
561         if (im->im_status & IDMAP_STATUS_SUCCESS) {
562                 *id = im->im_id;
563                 ret = 0;
564         }
565 
566  out:
567         memset(im, 0, sizeof(*im));
568         mutex_unlock(&idmap->idmap_im_lock);
569         mutex_unlock(&idmap->idmap_lock);
570         return ret;
571 }
572 
573 /*
574  * ID -> Name
575  */
576 static int
577 nfs_idmap_name(struct idmap *idmap, struct idmap_hashtable *h,
578                 __u32 id, char *name)
579 {
580         struct rpc_pipe_msg msg;
581         struct idmap_msg *im;
582         struct idmap_hashent *he;
583         DECLARE_WAITQUEUE(wq, current);
584         int ret = -EIO;
585         unsigned int len;
586 
587         im = &idmap->idmap_im;
588 
589         mutex_lock(&idmap->idmap_lock);
590         mutex_lock(&idmap->idmap_im_lock);
591 
592         he = idmap_lookup_id(h, id);
593         if (he) {
594                 memcpy(name, he->ih_name, he->ih_namelen);
595                 ret = he->ih_namelen;
596                 goto out;
597         }
598 
599         memset(im, 0, sizeof(*im));
600         im->im_type = h->h_type;
601         im->im_conv = IDMAP_CONV_IDTONAME;
602         im->im_id = id;
603 
604         memset(&msg, 0, sizeof(msg));
605         msg.data = im;
606         msg.len = sizeof(*im);
607 
608         add_wait_queue(&idmap->idmap_wq, &wq);
609 
610         if (rpc_queue_upcall(idmap->idmap_dentry->d_inode, &msg) < 0) {
611                 remove_wait_queue(&idmap->idmap_wq, &wq);
612                 goto out;
613         }
614 
615         set_current_state(TASK_UNINTERRUPTIBLE);
616         mutex_unlock(&idmap->idmap_im_lock);
617         schedule();
618         __set_current_state(TASK_RUNNING);
619         remove_wait_queue(&idmap->idmap_wq, &wq);
620         mutex_lock(&idmap->idmap_im_lock);
621 
622         if (im->im_status & IDMAP_STATUS_SUCCESS) {
623                 if ((len = strnlen(im->im_name, IDMAP_NAMESZ)) == 0)
624                         goto out;
625                 memcpy(name, im->im_name, len);
626                 ret = len;
627         }
628 
629  out:
630         memset(im, 0, sizeof(*im));
631         mutex_unlock(&idmap->idmap_im_lock);
632         mutex_unlock(&idmap->idmap_lock);
633         return ret;
634 }
635 
636 static ssize_t
637 idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
638 {
639         struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
640         struct idmap *idmap = (struct idmap *)rpci->private;
641         struct idmap_msg im_in, *im = &idmap->idmap_im;
642         struct idmap_hashtable *h;
643         struct idmap_hashent *he = NULL;
644         size_t namelen_in;
645         int ret;
646 
647         if (mlen != sizeof(im_in))
648                 return -ENOSPC;
649 
650         if (copy_from_user(&im_in, src, mlen) != 0)
651                 return -EFAULT;
652 
653         mutex_lock(&idmap->idmap_im_lock);
654 
655         ret = mlen;
656         im->im_status = im_in.im_status;
657         /* If we got an error, terminate now, and wake up pending upcalls */
658         if (!(im_in.im_status & IDMAP_STATUS_SUCCESS)) {
659                 wake_up(&idmap->idmap_wq);
660                 goto out;
661         }
662 
663         /* Sanity checking of strings */
664         ret = -EINVAL;
665         namelen_in = strnlen(im_in.im_name, IDMAP_NAMESZ);
666         if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ)
667                 goto out;
668 
669         switch (im_in.im_type) {
670                 case IDMAP_TYPE_USER:
671                         h = &idmap->idmap_user_hash;
672                         break;
673                 case IDMAP_TYPE_GROUP:
674                         h = &idmap->idmap_group_hash;
675                         break;
676                 default:
677                         goto out;
678         }
679 
680         switch (im_in.im_conv) {
681         case IDMAP_CONV_IDTONAME:
682                 /* Did we match the current upcall? */
683                 if (im->im_conv == IDMAP_CONV_IDTONAME
684                                 && im->im_type == im_in.im_type
685                                 && im->im_id == im_in.im_id) {
686                         /* Yes: copy string, including the terminating '\0'  */
687                         memcpy(im->im_name, im_in.im_name, namelen_in);
688                         im->im_name[namelen_in] = '\0';
689                         wake_up(&idmap->idmap_wq);
690                 }
691                 he = idmap_alloc_id(h, im_in.im_id);
692                 break;
693         case IDMAP_CONV_NAMETOID:
694                 /* Did we match the current upcall? */
695                 if (im->im_conv == IDMAP_CONV_NAMETOID
696                                 && im->im_type == im_in.im_type
697                                 && strnlen(im->im_name, IDMAP_NAMESZ) == namelen_in
698                                 && memcmp(im->im_name, im_in.im_name, namelen_in) == 0) {
699                         im->im_id = im_in.im_id;
700                         wake_up(&idmap->idmap_wq);
701                 }
702                 he = idmap_alloc_name(h, im_in.im_name, namelen_in);
703                 break;
704         default:
705                 goto out;
706         }
707 
708         /* If the entry is valid, also copy it to the cache */
709         if (he != NULL)
710                 idmap_update_entry(he, im_in.im_name, namelen_in, im_in.im_id);
711         ret = mlen;
712 out:
713         mutex_unlock(&idmap->idmap_im_lock);
714         return ret;
715 }
716 
717 static void
718 idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
719 {
720         struct idmap_msg *im = msg->data;
721         struct idmap *idmap = container_of(im, struct idmap, idmap_im); 
722 
723         if (msg->errno >= 0)
724                 return;
725         mutex_lock(&idmap->idmap_im_lock);
726         im->im_status = IDMAP_STATUS_LOOKUPFAIL;
727         wake_up(&idmap->idmap_wq);
728         mutex_unlock(&idmap->idmap_im_lock);
729 }
730 
731 /* 
732  * Fowler/Noll/Vo hash
733  *    http://www.isthe.com/chongo/tech/comp/fnv/
734  */
735 
736 #define FNV_P_32 ((unsigned int)0x01000193) /* 16777619 */
737 #define FNV_1_32 ((unsigned int)0x811c9dc5) /* 2166136261 */
738 
739 static unsigned int fnvhash32(const void *buf, size_t buflen)
740 {
741         const unsigned char *p, *end = (const unsigned char *)buf + buflen;
742         unsigned int hash = FNV_1_32;
743 
744         for (p = buf; p < end; p++) {
745                 hash *= FNV_P_32;
746                 hash ^= (unsigned int)*p;
747         }
748 
749         return hash;
750 }
751 
752 int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
753 {
754         struct idmap *idmap = server->nfs_client->cl_idmap;
755 
756         if (nfs_map_string_to_numeric(name, namelen, uid))
757                 return 0;
758         return nfs_idmap_id(idmap, &idmap->idmap_user_hash, name, namelen, uid);
759 }
760 
761 int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
762 {
763         struct idmap *idmap = server->nfs_client->cl_idmap;
764 
765         if (nfs_map_string_to_numeric(name, namelen, uid))
766                 return 0;
767         return nfs_idmap_id(idmap, &idmap->idmap_group_hash, name, namelen, uid);
768 }
769 
770 int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
771 {
772         struct idmap *idmap = server->nfs_client->cl_idmap;
773         int ret = -EINVAL;
774 
775         if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
776                 ret = nfs_idmap_name(idmap, &idmap->idmap_user_hash, uid, buf);
777         if (ret < 0)
778                 ret = nfs_map_numeric_to_string(uid, buf, buflen);
779         return ret;
780 }
781 int nfs_map_gid_to_group(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
782 {
783         struct idmap *idmap = server->nfs_client->cl_idmap;
784         int ret = -EINVAL;
785 
786         if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
787                 ret = nfs_idmap_name(idmap, &idmap->idmap_group_hash, uid, buf);
788         if (ret < 0)
789                 ret = nfs_map_numeric_to_string(uid, buf, buflen);
790         return ret;
791 }
792 
793 #endif /* CONFIG_NFS_USE_NEW_IDMAPPER */
794 

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