fs/nfsd/nfs4idmap.c

   1 /*
   2  *  Mapping of UID/GIDs to name and vice versa.
   3  *
   4  *  Copyright (c) 2002, 2003 The Regents of the University of
   5  *  Michigan.  All rights reserved.
   6  *
   7  *  Marius Aamodt Eriksen <marius@umich.edu>
   8  *
   9  *  Redistribution and use in source and binary forms, with or without
  10  *  modification, are permitted provided that the following conditions
  11  *  are met:
  12  *
  13  *  1. Redistributions of source code must retain the above copyright
  14  *     notice, this list of conditions and the following disclaimer.
  15  *  2. Redistributions in binary form must reproduce the above copyright
  16  *     notice, this list of conditions and the following disclaimer in the
  17  *     documentation and/or other materials provided with the distribution.
  18  *  3. Neither the name of the University nor the names of its
  19  *     contributors may be used to endorse or promote products derived
  20  *     from this software without specific prior written permission.
  21  *
  22  *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
  23  *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  24  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  25  *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
  29  *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
  30  *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
  31  *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
  32  *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include <linux/module.h>
  36 #include <linux/seq_file.h>
  37 #include <linux/sched.h>
  38 #include <linux/slab.h>
  39 #include <linux/sunrpc/svc_xprt.h>
  40 #include <net/net_namespace.h>
  41 #include "idmap.h"
  42 #include "nfsd.h"
  43 #include "netns.h"
  44
  45 /*
  46  * Turn off idmapping when using AUTH_SYS.
  47  */
  48 static bool nfs4_disable_idmapping = true;
  49 module_param(nfs4_disable_idmapping, bool, 0644);
  50 MODULE_PARM_DESC(nfs4_disable_idmapping,
  51                 "Turn off server's NFSv4 idmapping when using 'sec=sys'");
  52
  53 /*
  54  * Cache entry
  55  */
  56
  57 /*
  58  * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
  59  * that.
  60  */
  61
  62 #define IDMAP_TYPE_USER  0
  63 #define IDMAP_TYPE_GROUP 1
  64
  65 struct ent {
  66         struct cache_head h;
  67         int               type;                /* User / Group */
  68         u32               id;
  69         char              name[IDMAP_NAMESZ];
  70         char              authname[IDMAP_NAMESZ];
  71 };
  72
  73 /* Common entry handling */
  74
  75 #define ENT_HASHBITS          8
  76 #define ENT_HASHMAX           (1 << ENT_HASHBITS)
  77
  78 static void
  79 ent_init(struct cache_head *cnew, struct cache_head *citm)
  80 {
  81         struct ent *new = container_of(cnew, struct ent, h);
  82         struct ent *itm = container_of(citm, struct ent, h);
  83
  84         new->id = itm->id;
  85         new->type = itm->type;
  86
  87         strlcpy(new->name, itm->name, sizeof(new->name));
  88         strlcpy(new->authname, itm->authname, sizeof(new->name));
  89 }
  90
  91 static void
  92 ent_put(struct kref *ref)
  93 {
  94         struct ent *map = container_of(ref, struct ent, h.ref);
  95         kfree(map);
  96 }
  97
  98 static struct cache_head *
  99 ent_alloc(void)
 100 {
 101         struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
 102         if (e)
 103                 return &e->h;
 104         else
 105                 return NULL;
 106 }
 107
 108 /*
 109  * ID -> Name cache
 110  */
 111
 112 static uint32_t
 113 idtoname_hash(struct ent *ent)
 114 {
 115         uint32_t hash;
 116
 117         hash = hash_str(ent->authname, ENT_HASHBITS);
 118         hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
 119
 120         /* Flip LSB for user/group */
 121         if (ent->type == IDMAP_TYPE_GROUP)
 122                 hash ^= 1;
 123
 124         return hash;
 125 }
 126
 127 static void
 128 idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
 129     int *blen)
 130 {
 131         struct ent *ent = container_of(ch, struct ent, h);
 132         char idstr[11];
 133
 134         qword_add(bpp, blen, ent->authname);
 135         snprintf(idstr, sizeof(idstr), "%u", ent->id);
 136         qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
 137         qword_add(bpp, blen, idstr);
 138
 139         (*bpp)[-1] = '\n';
 140 }
 141
 142 static int
 143 idtoname_match(struct cache_head *ca, struct cache_head *cb)
 144 {
 145         struct ent *a = container_of(ca, struct ent, h);
 146         struct ent *b = container_of(cb, struct ent, h);
 147
 148         return (a->id == b->id && a->type == b->type &&
 149             strcmp(a->authname, b->authname) == 0);
 150 }
 151
 152 static int
 153 idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
 154 {
 155         struct ent *ent;
 156
 157         if (h == NULL) {
 158                 seq_puts(m, "#domain type id [name]\n");
 159                 return 0;
 160         }
 161         ent = container_of(h, struct ent, h);
 162         seq_printf(m, "%s %s %u", ent->authname,
 163                         ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
 164                         ent->id);
 165         if (test_bit(CACHE_VALID, &h->flags))
 166                 seq_printf(m, " %s", ent->name);
 167         seq_printf(m, "\n");
 168         return 0;
 169 }
 170
 171 static void
 172 warn_no_idmapd(struct cache_detail *detail, int has_died)
 173 {
 174         printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
 175                         has_died ? "died" : "not been started");
 176 }
 177
 178
 179 static int         idtoname_parse(struct cache_detail *, char *, int);
 180 static struct ent *idtoname_lookup(struct cache_detail *, struct ent *);
 181 static struct ent *idtoname_update(struct cache_detail *, struct ent *,
 182                                    struct ent *);
 183
 184 static struct cache_detail idtoname_cache_template = {
 185         .owner          = THIS_MODULE,
 186         .hash_size      = ENT_HASHMAX,
 187         .name           = "nfs4.idtoname",
 188         .cache_put      = ent_put,
 189         .cache_request  = idtoname_request,
 190         .cache_parse    = idtoname_parse,
 191         .cache_show     = idtoname_show,
 192         .warn_no_listener = warn_no_idmapd,
 193         .match          = idtoname_match,
 194         .init           = ent_init,
 195         .update         = ent_init,
 196         .alloc          = ent_alloc,
 197 };
 198
 199 static int
 200 idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
 201 {
 202         struct ent ent, *res;
 203         char *buf1, *bp;
 204         int len;
 205         int error = -EINVAL;
 206
 207         if (buf[buflen - 1] != '\n')
 208                 return (-EINVAL);
 209         buf[buflen - 1]= '\0';
 210
 211         buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
 212         if (buf1 == NULL)
 213                 return (-ENOMEM);
 214
 215         memset(&ent, 0, sizeof(ent));
 216
 217         /* Authentication name */
 218         len = qword_get(&buf, buf1, PAGE_SIZE);
 219         if (len <= 0 || len >= IDMAP_NAMESZ)
 220                 goto out;
 221         memcpy(ent.authname, buf1, sizeof(ent.authname));
 222
 223         /* Type */
 224         if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
 225                 goto out;
 226         ent.type = strcmp(buf1, "user") == 0 ?
 227                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 228
 229         /* ID */
 230         if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
 231                 goto out;
 232         ent.id = simple_strtoul(buf1, &bp, 10);
 233         if (bp == buf1)
 234                 goto out;
 235
 236         /* expiry */
 237         ent.h.expiry_time = get_expiry(&buf);
 238         if (ent.h.expiry_time == 0)
 239                 goto out;
 240
 241         error = -ENOMEM;
 242         res = idtoname_lookup(cd, &ent);
 243         if (!res)
 244                 goto out;
 245
 246         /* Name */
 247         error = -EINVAL;
 248         len = qword_get(&buf, buf1, PAGE_SIZE);
 249         if (len < 0 || len >= IDMAP_NAMESZ)
 250                 goto out;
 251         if (len == 0)
 252                 set_bit(CACHE_NEGATIVE, &ent.h.flags);
 253         else
 254                 memcpy(ent.name, buf1, sizeof(ent.name));
 255         error = -ENOMEM;
 256         res = idtoname_update(cd, &ent, res);
 257         if (res == NULL)
 258                 goto out;
 259
 260         cache_put(&res->h, cd);
 261         error = 0;
 262 out:
 263         kfree(buf1);
 264         return error;
 265 }
 266
 267 static struct ent *
 268 idtoname_lookup(struct cache_detail *cd, struct ent *item)
 269 {
 270         struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
 271                                                     idtoname_hash(item));
 272         if (ch)
 273                 return container_of(ch, struct ent, h);
 274         else
 275                 return NULL;
 276 }
 277
 278 static struct ent *
 279 idtoname_update(struct cache_detail *cd, struct ent *new, struct ent *old)
 280 {
 281         struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
 282                                                     idtoname_hash(new));
 283         if (ch)
 284                 return container_of(ch, struct ent, h);
 285         else
 286                 return NULL;
 287 }
 288
 289
 290 /*
 291  * Name -> ID cache
 292  */
 293
 294 static inline int
 295 nametoid_hash(struct ent *ent)
 296 {
 297         return hash_str(ent->name, ENT_HASHBITS);
 298 }
 299
 300 static void
 301 nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
 302     int *blen)
 303 {
 304         struct ent *ent = container_of(ch, struct ent, h);
 305
 306         qword_add(bpp, blen, ent->authname);
 307         qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
 308         qword_add(bpp, blen, ent->name);
 309
 310         (*bpp)[-1] = '\n';
 311 }
 312
 313 static int
 314 nametoid_match(struct cache_head *ca, struct cache_head *cb)
 315 {
 316         struct ent *a = container_of(ca, struct ent, h);
 317         struct ent *b = container_of(cb, struct ent, h);
 318
 319         return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
 320             strcmp(a->authname, b->authname) == 0);
 321 }
 322
 323 static int
 324 nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
 325 {
 326         struct ent *ent;
 327
 328         if (h == NULL) {
 329                 seq_puts(m, "#domain type name [id]\n");
 330                 return 0;
 331         }
 332         ent = container_of(h, struct ent, h);
 333         seq_printf(m, "%s %s %s", ent->authname,
 334                         ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
 335                         ent->name);
 336         if (test_bit(CACHE_VALID, &h->flags))
 337                 seq_printf(m, " %u", ent->id);
 338         seq_printf(m, "\n");
 339         return 0;
 340 }
 341
 342 static struct ent *nametoid_lookup(struct cache_detail *, struct ent *);
 343 static struct ent *nametoid_update(struct cache_detail *, struct ent *,
 344                                    struct ent *);
 345 static int         nametoid_parse(struct cache_detail *, char *, int);
 346
 347 static struct cache_detail nametoid_cache_template = {
 348         .owner          = THIS_MODULE,
 349         .hash_size      = ENT_HASHMAX,
 350         .name           = "nfs4.nametoid",
 351         .cache_put      = ent_put,
 352         .cache_request  = nametoid_request,
 353         .cache_parse    = nametoid_parse,
 354         .cache_show     = nametoid_show,
 355         .warn_no_listener = warn_no_idmapd,
 356         .match          = nametoid_match,
 357         .init           = ent_init,
 358         .update         = ent_init,
 359         .alloc          = ent_alloc,
 360 };
 361
 362 static int
 363 nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
 364 {
 365         struct ent ent, *res;
 366         char *buf1;
 367         int len, error = -EINVAL;
 368
 369         if (buf[buflen - 1] != '\n')
 370                 return (-EINVAL);
 371         buf[buflen - 1]= '\0';
 372
 373         buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
 374         if (buf1 == NULL)
 375                 return (-ENOMEM);
 376
 377         memset(&ent, 0, sizeof(ent));
 378
 379         /* Authentication name */
 380         len = qword_get(&buf, buf1, PAGE_SIZE);
 381         if (len <= 0 || len >= IDMAP_NAMESZ)
 382                 goto out;
 383         memcpy(ent.authname, buf1, sizeof(ent.authname));
 384
 385         /* Type */
 386         if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
 387                 goto out;
 388         ent.type = strcmp(buf1, "user") == 0 ?
 389                 IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
 390
 391         /* Name */
 392         len = qword_get(&buf, buf1, PAGE_SIZE);
 393         if (len <= 0 || len >= IDMAP_NAMESZ)
 394                 goto out;
 395         memcpy(ent.name, buf1, sizeof(ent.name));
 396
 397         /* expiry */
 398         ent.h.expiry_time = get_expiry(&buf);
 399         if (ent.h.expiry_time == 0)
 400                 goto out;
 401
 402         /* ID */
 403         error = get_int(&buf, &ent.id);
 404         if (error == -EINVAL)
 405                 goto out;
 406         if (error == -ENOENT)
 407                 set_bit(CACHE_NEGATIVE, &ent.h.flags);
 408
 409         error = -ENOMEM;
 410         res = nametoid_lookup(cd, &ent);
 411         if (res == NULL)
 412                 goto out;
 413         res = nametoid_update(cd, &ent, res);
 414         if (res == NULL)
 415                 goto out;
 416
 417         cache_put(&res->h, cd);
 418         error = 0;
 419 out:
 420         kfree(buf1);
 421         return (error);
 422 }
 423
 424
 425 static struct ent *
 426 nametoid_lookup(struct cache_detail *cd, struct ent *item)
 427 {
 428         struct cache_head *ch = sunrpc_cache_lookup(cd, &item->h,
 429                                                     nametoid_hash(item));
 430         if (ch)
 431                 return container_of(ch, struct ent, h);
 432         else
 433                 return NULL;
 434 }
 435
 436 static struct ent *
 437 nametoid_update(struct cache_detail *cd, struct ent *new, struct ent *old)
 438 {
 439         struct cache_head *ch = sunrpc_cache_update(cd, &new->h, &old->h,
 440                                                     nametoid_hash(new));
 441         if (ch)
 442                 return container_of(ch, struct ent, h);
 443         else
 444                 return NULL;
 445 }
 446
 447 /*
 448  * Exported API
 449  */
 450
 451 int
 452 nfsd_idmap_init(struct net *net)
 453 {
 454         int rv;
 455         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 456
 457         nn->idtoname_cache = cache_create_net(&idtoname_cache_template, net);
 458         if (IS_ERR(nn->idtoname_cache))
 459                 return PTR_ERR(nn->idtoname_cache);
 460         rv = cache_register_net(nn->idtoname_cache, net);
 461         if (rv)
 462                 goto destroy_idtoname_cache;
 463         nn->nametoid_cache = cache_create_net(&nametoid_cache_template, net);
 464         if (IS_ERR(nn->nametoid_cache)) {
 465                 rv = PTR_ERR(nn->nametoid_cache);
 466                 goto unregister_idtoname_cache;
 467         }
 468         rv = cache_register_net(nn->nametoid_cache, net);
 469         if (rv)
 470                 goto destroy_nametoid_cache;
 471         return 0;
 472
 473 destroy_nametoid_cache:
 474         cache_destroy_net(nn->nametoid_cache, net);
 475 unregister_idtoname_cache:
 476         cache_unregister_net(nn->idtoname_cache, net);
 477 destroy_idtoname_cache:
 478         cache_destroy_net(nn->idtoname_cache, net);
 479         return rv;
 480 }
 481
 482 void
 483 nfsd_idmap_shutdown(struct net *net)
 484 {
 485         struct nfsd_net *nn = net_generic(net, nfsd_net_id);
 486
 487         cache_unregister_net(nn->idtoname_cache, net);
 488         cache_unregister_net(nn->nametoid_cache, net);
 489         cache_destroy_net(nn->idtoname_cache, net);
 490         cache_destroy_net(nn->nametoid_cache, net);
 491 }
 492
 493 static int
 494 idmap_lookup(struct svc_rqst *rqstp,
 495                 struct ent *(*lookup_fn)(struct cache_detail *, struct ent *),
 496                 struct ent *key, struct cache_detail *detail, struct ent **item)
 497 {
 498         int ret;
 499
 500         *item = lookup_fn(detail, key);
 501         if (!*item)
 502                 return -ENOMEM;
 503  retry:
 504         ret = cache_check(detail, &(*item)->h, &rqstp->rq_chandle);
 505
 506         if (ret == -ETIMEDOUT) {
 507                 struct ent *prev_item = *item;
 508                 *item = lookup_fn(detail, key);
 509                 if (*item != prev_item)
 510                         goto retry;
 511                 cache_put(&(*item)->h, detail);
 512         }
 513         return ret;
 514 }
 515
 516 static char *
 517 rqst_authname(struct svc_rqst *rqstp)
 518 {
 519         struct auth_domain *clp;
 520
 521         clp = rqstp->rq_gssclient ? rqstp->rq_gssclient : rqstp->rq_client;
 522         return clp->name;
 523 }
 524
 525 static __be32
 526 idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
 527                 u32 *id)
 528 {
 529         struct ent *item, key = {
 530                 .type = type,
 531         };
 532         int ret;
 533         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 534
 535         if (namelen + 1 > sizeof(key.name))
 536                 return nfserr_badowner;
 537         memcpy(key.name, name, namelen);
 538         key.name[namelen] = '\0';
 539         strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
 540         ret = idmap_lookup(rqstp, nametoid_lookup, &key, nn->nametoid_cache, &item);
 541         if (ret == -ENOENT)
 542                 return nfserr_badowner;
 543         if (ret)
 544                 return nfserrno(ret);
 545         *id = item->id;
 546         cache_put(&item->h, nn->nametoid_cache);
 547         return 0;
 548 }
 549
 550 static __be32 encode_ascii_id(struct xdr_stream *xdr, u32 id)
 551 {
 552         char buf[11];
 553         int len;
 554         __be32 *p;
 555
 556         len = sprintf(buf, "%u", id);
 557         p = xdr_reserve_space(xdr, len + 4);
 558         if (!p)
 559                 return nfserr_resource;
 560         p = xdr_encode_opaque(p, buf, len);
 561         return 0;
 562 }
 563
 564 static __be32 idmap_id_to_name(struct xdr_stream *xdr,
 565                                struct svc_rqst *rqstp, int type, u32 id)
 566 {
 567         struct ent *item, key = {
 568                 .id = id,
 569                 .type = type,
 570         };
 571         __be32 *p;
 572         int ret;
 573         struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
 574
 575         strlcpy(key.authname, rqst_authname(rqstp), sizeof(key.authname));
 576         ret = idmap_lookup(rqstp, idtoname_lookup, &key, nn->idtoname_cache, &item);
 577         if (ret == -ENOENT)
 578                 return encode_ascii_id(xdr, id);
 579         if (ret)
 580                 return nfserrno(ret);
 581         ret = strlen(item->name);
 582         WARN_ON_ONCE(ret > IDMAP_NAMESZ);
 583         p = xdr_reserve_space(xdr, ret + 4);
 584         if (!p)
 585                 return nfserr_resource;
 586         p = xdr_encode_opaque(p, item->name, ret);
 587         cache_put(&item->h, nn->idtoname_cache);
 588         return 0;
 589 }
 590
 591 static bool
 592 numeric_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
 593 {
 594         int ret;
 595         char buf[11];
 596
 597         if (namelen + 1 > sizeof(buf))
 598                 /* too long to represent a 32-bit id: */
 599                 return false;
 600         /* Just to make sure it's null-terminated: */
 601         memcpy(buf, name, namelen);
 602         buf[namelen] = '\0';
 603         ret = kstrtouint(buf, 10, id);
 604         return ret == 0;
 605 }
 606
 607 static __be32
 608 do_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen, u32 *id)
 609 {
 610         if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
 611                 if (numeric_name_to_id(rqstp, type, name, namelen, id))
 612                         return 0;
 613                 /*
 614                  * otherwise, fall through and try idmapping, for
 615                  * backwards compatibility with clients sending names:
 616                  */
 617         return idmap_name_to_id(rqstp, type, name, namelen, id);
 618 }
 619
 620 static __be32 encode_name_from_id(struct xdr_stream *xdr,
 621                                   struct svc_rqst *rqstp, int type, u32 id)
 622 {
 623         if (nfs4_disable_idmapping && rqstp->rq_cred.cr_flavor < RPC_AUTH_GSS)
 624                 return encode_ascii_id(xdr, id);
 625         return idmap_id_to_name(xdr, rqstp, type, id);
 626 }
 627
 628 __be32
 629 nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
 630                 kuid_t *uid)
 631 {
 632         __be32 status;
 633         u32 id = -1;
 634         status = do_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, &id);
 635         *uid = make_kuid(&init_user_ns, id);
 636         if (!uid_valid(*uid))
 637                 status = nfserr_badowner;
 638         return status;
 639 }
 640
 641 __be32
 642 nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
 643                 kgid_t *gid)
 644 {
 645         __be32 status;
 646         u32 id = -1;
 647         status = do_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, &id);
 648         *gid = make_kgid(&init_user_ns, id);
 649         if (!gid_valid(*gid))
 650                 status = nfserr_badowner;
 651         return status;
 652 }
 653
 654 __be32 nfsd4_encode_user(struct xdr_stream *xdr, struct svc_rqst *rqstp,
 655                          kuid_t uid)
 656 {
 657         u32 id = from_kuid(&init_user_ns, uid);
 658         return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_USER, id);
 659 }
 660
 661 __be32 nfsd4_encode_group(struct xdr_stream *xdr, struct svc_rqst *rqstp,
 662                           kgid_t gid)
 663 {
 664         u32 id = from_kgid(&init_user_ns, gid);
 665         return encode_name_from_id(xdr, rqstp, IDMAP_TYPE_GROUP, id);
 666 }