zfs/lib/libdmu-ctl/zfs_fuid.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21 /*
  22  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  23  * Use is subject to license terms.
  24  */
  25
  26 #pragma ident   "@(#)zfs_fuid.c 1.5     08/01/31 SMI"
  27
  28 #include <sys/zfs_context.h>
  29 #include <sys/sunddi.h>
  30 #include <sys/dmu.h>
  31 #include <sys/avl.h>
  32 #include <sys/zap.h>
  33 #include <sys/refcount.h>
  34 #include <sys/nvpair.h>
  35 #ifdef _KERNEL
  36 #include <sys/kidmap.h>
  37 #include <sys/sid.h>
  38 #include <sys/zfs_vfsops.h>
  39 #include <sys/zfs_znode.h>
  40 #endif
  41 #include <sys/zfs_fuid.h>
  42
  43 /*
  44  * FUID Domain table(s).
  45  *
  46  * The FUID table is stored as a packed nvlist of an array
  47  * of nvlists which contain an index, domain string and offset
  48  *
  49  * During file system initialization the nvlist(s) are read and
  50  * two AVL trees are created.  One tree is keyed by the index number
  51  * and the other by the domain string.  Nodes are never removed from
  52  * trees, but new entries may be added.  If a new entry is added then the
  53  * on-disk packed nvlist will also be updated.
  54  */
  55
  56 #define FUID_IDX        "fuid_idx"
  57 #define FUID_DOMAIN     "fuid_domain"
  58 #define FUID_OFFSET     "fuid_offset"
  59 #define FUID_NVP_ARRAY  "fuid_nvlist"
  60
  61 typedef struct fuid_domain {
  62         avl_node_t      f_domnode;
  63         avl_node_t      f_idxnode;
  64         ksiddomain_t    *f_ksid;
  65         uint64_t        f_idx;
  66 } fuid_domain_t;
  67
  68 /*
  69  * Compare two indexes.
  70  */
  71 static int
  72 idx_compare(const void *arg1, const void *arg2)
  73 {
  74         const fuid_domain_t *node1 = arg1;
  75         const fuid_domain_t *node2 = arg2;
  76
  77         if (node1->f_idx < node2->f_idx)
  78                 return (-1);
  79         else if (node1->f_idx > node2->f_idx)
  80                 return (1);
  81         return (0);
  82 }
  83
  84 /*
  85  * Compare two domain strings.
  86  */
  87 static int
  88 domain_compare(const void *arg1, const void *arg2)
  89 {
  90         const fuid_domain_t *node1 = arg1;
  91         const fuid_domain_t *node2 = arg2;
  92         int val;
  93
  94         val = strcmp(node1->f_ksid->kd_name, node2->f_ksid->kd_name);
  95         if (val == 0)
  96                 return (0);
  97         return (val > 0 ? 1 : -1);
  98 }
  99
 100 /*
 101  * load initial fuid domain and idx trees.  This function is used by
 102  * both the kernel and zdb.
 103  */
 104 uint64_t
 105 zfs_fuid_table_load(objset_t *os, uint64_t fuid_obj, avl_tree_t *idx_tree,
 106     avl_tree_t *domain_tree)
 107 {
 108         dmu_buf_t *db;
 109         uint64_t fuid_size;
 110
 111         avl_create(idx_tree, idx_compare,
 112             sizeof (fuid_domain_t), offsetof(fuid_domain_t, f_idxnode));
 113         avl_create(domain_tree, domain_compare,
 114             sizeof (fuid_domain_t), offsetof(fuid_domain_t, f_domnode));
 115
 116         VERIFY(0 == dmu_bonus_hold(os, fuid_obj, FTAG, &db));
 117         fuid_size = *(uint64_t *)db->db_data;
 118         dmu_buf_rele(db, FTAG);
 119
 120         if (fuid_size)  {
 121                 nvlist_t **fuidnvp;
 122                 nvlist_t *nvp = NULL;
 123                 uint_t count;
 124                 char *packed;
 125                 int i;
 126
 127                 packed = kmem_alloc(fuid_size, KM_SLEEP);
 128                 VERIFY(dmu_read(os, fuid_obj, 0, fuid_size, packed) == 0);
 129                 VERIFY(nvlist_unpack(packed, fuid_size,
 130                     &nvp, 0) == 0);
 131                 VERIFY(nvlist_lookup_nvlist_array(nvp, FUID_NVP_ARRAY,
 132                     &fuidnvp, &count) == 0);
 133
 134                 for (i = 0; i != count; i++) {
 135                         fuid_domain_t *domnode;
 136                         char *domain;
 137                         uint64_t idx;
 138
 139                         VERIFY(nvlist_lookup_string(fuidnvp[i], FUID_DOMAIN,
 140                             &domain) == 0);
 141                         VERIFY(nvlist_lookup_uint64(fuidnvp[i], FUID_IDX,
 142                             &idx) == 0);
 143
 144                         domnode = kmem_alloc(sizeof (fuid_domain_t), KM_SLEEP);
 145
 146                         domnode->f_idx = idx;
 147                         domnode->f_ksid = ksid_lookupdomain(domain);
 148                         avl_add(idx_tree, domnode);
 149                         avl_add(domain_tree, domnode);
 150                 }
 151                 nvlist_free(nvp);
 152                 kmem_free(packed, fuid_size);
 153         }
 154         return (fuid_size);
 155 }
 156
 157 void
 158 zfs_fuid_table_destroy(avl_tree_t *idx_tree, avl_tree_t *domain_tree)
 159 {
 160         fuid_domain_t *domnode;
 161         void *cookie;
 162
 163         cookie = NULL;
 164         while (domnode = avl_destroy_nodes(domain_tree, &cookie))
 165                 ksiddomain_rele(domnode->f_ksid);
 166
 167         avl_destroy(domain_tree);
 168         cookie = NULL;
 169         while (domnode = avl_destroy_nodes(idx_tree, &cookie))
 170                 kmem_free(domnode, sizeof (fuid_domain_t));
 171         avl_destroy(idx_tree);
 172 }
 173
 174 char *
 175 zfs_fuid_idx_domain(avl_tree_t *idx_tree, uint32_t idx)
 176 {
 177         fuid_domain_t searchnode, *findnode;
 178         avl_index_t loc;
 179
 180         searchnode.f_idx = idx;
 181
 182         findnode = avl_find(idx_tree, &searchnode, &loc);
 183
 184         return (findnode->f_ksid->kd_name);
 185 }
 186
 187 #ifdef _KERNEL
 188 /*
 189  * Load the fuid table(s) into memory.
 190  */
 191 static void
 192 zfs_fuid_init(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
 193 {
 194         int error = 0;
 195
 196         rw_enter(&zfsvfs->z_fuid_lock, RW_WRITER);
 197
 198         if (zfsvfs->z_fuid_loaded) {
 199                 rw_exit(&zfsvfs->z_fuid_lock);
 200                 return;
 201         }
 202
 203         if (zfsvfs->z_fuid_obj == 0) {
 204
 205                 /* first make sure we need to allocate object */
 206
 207                 error = zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ,
 208                     ZFS_FUID_TABLES, 8, 1, &zfsvfs->z_fuid_obj);
 209                 if (error == ENOENT && tx != NULL) {
 210                         zfsvfs->z_fuid_obj = dmu_object_alloc(zfsvfs->z_os,
 211                             DMU_OT_FUID, 1 << 14, DMU_OT_FUID_SIZE,
 212                             sizeof (uint64_t), tx);
 213                         VERIFY(zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
 214                             ZFS_FUID_TABLES, sizeof (uint64_t), 1,
 215                             &zfsvfs->z_fuid_obj, tx) == 0);
 216                 }
 217         }
 218
 219         zfsvfs->z_fuid_size = zfs_fuid_table_load(zfsvfs->z_os,
 220             zfsvfs->z_fuid_obj, &zfsvfs->z_fuid_idx, &zfsvfs->z_fuid_domain);
 221
 222         zfsvfs->z_fuid_loaded = B_TRUE;
 223         rw_exit(&zfsvfs->z_fuid_lock);
 224 }
 225
 226 /*
 227  * Query domain table for a given domain.
 228  *
 229  * If domain isn't found it is added to AVL trees and
 230  * the results are pushed out to disk.
 231  */
 232 int
 233 zfs_fuid_find_by_domain(zfsvfs_t *zfsvfs, const char *domain, char **retdomain,
 234     dmu_tx_t *tx)
 235 {
 236         fuid_domain_t searchnode, *findnode;
 237         avl_index_t loc;
 238
 239         /*
 240          * If the dummy "nobody" domain then return an index of 0
 241          * to cause the created FUID to be a standard POSIX id
 242          * for the user nobody.
 243          */
 244         if (domain[0] == '\0') {
 245                 *retdomain = "";
 246                 return (0);
 247         }
 248
 249         searchnode.f_ksid = ksid_lookupdomain(domain);
 250         if (retdomain) {
 251                 *retdomain = searchnode.f_ksid->kd_name;
 252         }
 253         if (!zfsvfs->z_fuid_loaded)
 254                 zfs_fuid_init(zfsvfs, tx);
 255
 256         rw_enter(&zfsvfs->z_fuid_lock, RW_READER);
 257         findnode = avl_find(&zfsvfs->z_fuid_domain, &searchnode, &loc);
 258         rw_exit(&zfsvfs->z_fuid_lock);
 259
 260         if (findnode) {
 261                 ksiddomain_rele(searchnode.f_ksid);
 262                 return (findnode->f_idx);
 263         } else {
 264                 fuid_domain_t *domnode;
 265                 nvlist_t *nvp;
 266                 nvlist_t **fuids;
 267                 uint64_t retidx;
 268                 size_t nvsize = 0;
 269                 char *packed;
 270                 dmu_buf_t *db;
 271                 int i = 0;
 272
 273                 domnode = kmem_alloc(sizeof (fuid_domain_t), KM_SLEEP);
 274                 domnode->f_ksid = searchnode.f_ksid;
 275
 276                 rw_enter(&zfsvfs->z_fuid_lock, RW_WRITER);
 277                 retidx = domnode->f_idx = avl_numnodes(&zfsvfs->z_fuid_idx) + 1;
 278
 279                 avl_add(&zfsvfs->z_fuid_domain, domnode);
 280                 avl_add(&zfsvfs->z_fuid_idx, domnode);
 281                 /*
 282                  * Now resync the on-disk nvlist.
 283                  */
 284                 VERIFY(nvlist_alloc(&nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
 285
 286                 domnode = avl_first(&zfsvfs->z_fuid_domain);
 287                 fuids = kmem_alloc(retidx * sizeof (void *), KM_SLEEP);
 288                 while (domnode) {
 289                         VERIFY(nvlist_alloc(&fuids[i],
 290                             NV_UNIQUE_NAME, KM_SLEEP) == 0);
 291                         VERIFY(nvlist_add_uint64(fuids[i], FUID_IDX,
 292                             domnode->f_idx) == 0);
 293                         VERIFY(nvlist_add_uint64(fuids[i],
 294                             FUID_OFFSET, 0) == 0);
 295                         VERIFY(nvlist_add_string(fuids[i++], FUID_DOMAIN,
 296                             domnode->f_ksid->kd_name) == 0);
 297                         domnode = AVL_NEXT(&zfsvfs->z_fuid_domain, domnode);
 298                 }
 299                 VERIFY(nvlist_add_nvlist_array(nvp, FUID_NVP_ARRAY,
 300                     fuids, retidx) == 0);
 301                 for (i = 0; i != retidx; i++)
 302                         nvlist_free(fuids[i]);
 303                 kmem_free(fuids, retidx * sizeof (void *));
 304                 VERIFY(nvlist_size(nvp, &nvsize, NV_ENCODE_XDR) == 0);
 305                 packed = kmem_alloc(nvsize, KM_SLEEP);
 306                 VERIFY(nvlist_pack(nvp, &packed, &nvsize,
 307                     NV_ENCODE_XDR, KM_SLEEP) == 0);
 308                 nvlist_free(nvp);
 309                 zfsvfs->z_fuid_size = nvsize;
 310                 dmu_write(zfsvfs->z_os, zfsvfs->z_fuid_obj, 0,
 311                     zfsvfs->z_fuid_size, packed, tx);
 312                 kmem_free(packed, zfsvfs->z_fuid_size);
 313                 VERIFY(0 == dmu_bonus_hold(zfsvfs->z_os, zfsvfs->z_fuid_obj,
 314                     FTAG, &db));
 315                 dmu_buf_will_dirty(db, tx);
 316                 *(uint64_t *)db->db_data = zfsvfs->z_fuid_size;
 317                 dmu_buf_rele(db, FTAG);
 318
 319                 rw_exit(&zfsvfs->z_fuid_lock);
 320                 return (retidx);
 321         }
 322 }
 323
 324 /*
 325  * Query domain table by index, returning domain string
 326  *
 327  * Returns a pointer from an avl node of the domain string.
 328  *
 329  */
 330 static char *
 331 zfs_fuid_find_by_idx(zfsvfs_t *zfsvfs, uint32_t idx)
 332 {
 333         char *domain;
 334
 335         if (idx == 0 || !zfsvfs->z_use_fuids)
 336                 return (NULL);
 337
 338         if (!zfsvfs->z_fuid_loaded)
 339                 zfs_fuid_init(zfsvfs, NULL);
 340
 341         rw_enter(&zfsvfs->z_fuid_lock, RW_READER);
 342         domain = zfs_fuid_idx_domain(&zfsvfs->z_fuid_idx, idx);
 343         rw_exit(&zfsvfs->z_fuid_lock);
 344
 345         ASSERT(domain);
 346         return (domain);
 347 }
 348
 349 void
 350 zfs_fuid_map_ids(znode_t *zp, cred_t *cr, uid_t *uidp, uid_t *gidp)
 351 {
 352         *uidp = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_phys->zp_uid,
 353             cr, ZFS_OWNER);
 354         *gidp = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_phys->zp_gid,
 355             cr, ZFS_GROUP);
 356 }
 357
 358 uid_t
 359 zfs_fuid_map_id(zfsvfs_t *zfsvfs, uint64_t fuid,
 360     cred_t *cr, zfs_fuid_type_t type)
 361 {
 362         uint32_t index = FUID_INDEX(fuid);
 363         char *domain;
 364         uid_t id;
 365
 366         if (index == 0)
 367                 return (fuid);
 368
 369         domain = zfs_fuid_find_by_idx(zfsvfs, index);
 370         ASSERT(domain != NULL);
 371
 372         if (type == ZFS_OWNER || type == ZFS_ACE_USER) {
 373                 (void) kidmap_getuidbysid(crgetzone(cr), domain,
 374                     FUID_RID(fuid), &id);
 375         } else {
 376                 (void) kidmap_getgidbysid(crgetzone(cr), domain,
 377                     FUID_RID(fuid), &id);
 378         }
 379         return (id);
 380 }
 381
 382 /*
 383  * Add a FUID node to the list of fuid's being created for this
 384  * ACL
 385  *
 386  * If ACL has multiple domains, then keep only one copy of each unique
 387  * domain.
 388  */
 389 static void
 390 zfs_fuid_node_add(zfs_fuid_info_t **fuidpp, const char *domain, uint32_t rid,
 391     uint64_t idx, uint64_t id, zfs_fuid_type_t type)
 392 {
 393         zfs_fuid_t *fuid;
 394         zfs_fuid_domain_t *fuid_domain;
 395         zfs_fuid_info_t *fuidp;
 396         uint64_t fuididx;
 397         boolean_t found = B_FALSE;
 398
 399         if (*fuidpp == NULL)
 400                 *fuidpp = zfs_fuid_info_alloc();
 401
 402         fuidp = *fuidpp;
 403         /*
 404          * First find fuid domain index in linked list
 405          *
 406          * If one isn't found then create an entry.
 407          */
 408
 409         for (fuididx = 1, fuid_domain = list_head(&fuidp->z_domains);
 410             fuid_domain; fuid_domain = list_next(&fuidp->z_domains,
 411             fuid_domain), fuididx++) {
 412                 if (idx == fuid_domain->z_domidx) {
 413                         found = B_TRUE;
 414                         break;
 415                 }
 416         }
 417
 418         if (!found) {
 419                 fuid_domain = kmem_alloc(sizeof (zfs_fuid_domain_t), KM_SLEEP);
 420                 fuid_domain->z_domain = domain;
 421                 fuid_domain->z_domidx = idx;
 422                 list_insert_tail(&fuidp->z_domains, fuid_domain);
 423                 fuidp->z_domain_str_sz += strlen(domain) + 1;
 424                 fuidp->z_domain_cnt++;
 425         }
 426
 427         if (type == ZFS_ACE_USER || type == ZFS_ACE_GROUP) {
 428                 /*
 429                  * Now allocate fuid entry and add it on the end of the list
 430                  */
 431
 432                 fuid = kmem_alloc(sizeof (zfs_fuid_t), KM_SLEEP);
 433                 fuid->z_id = id;
 434                 fuid->z_domidx = idx;
 435                 fuid->z_logfuid = FUID_ENCODE(fuididx, rid);
 436
 437                 list_insert_tail(&fuidp->z_fuids, fuid);
 438                 fuidp->z_fuid_cnt++;
 439         } else {
 440                 if (type == ZFS_OWNER)
 441                         fuidp->z_fuid_owner = FUID_ENCODE(fuididx, rid);
 442                 else
 443                         fuidp->z_fuid_group = FUID_ENCODE(fuididx, rid);
 444         }
 445 }
 446
 447 /*
 448  * Create a file system FUID, based on information in the users cred
 449  */
 450 uint64_t
 451 zfs_fuid_create_cred(zfsvfs_t *zfsvfs, zfs_fuid_type_t type,
 452     dmu_tx_t *tx, cred_t *cr, zfs_fuid_info_t **fuidp)
 453 {
 454         uint64_t        idx;
 455         ksid_t          *ksid;
 456         uint32_t        rid;
 457         char            *kdomain;
 458         const char      *domain;
 459         uid_t           id;
 460
 461         VERIFY(type == ZFS_OWNER || type == ZFS_GROUP);
 462
 463         if (type == ZFS_OWNER)
 464                 id = crgetuid(cr);
 465         else
 466                 id = crgetgid(cr);
 467
 468         if (!zfsvfs->z_use_fuids || !IS_EPHEMERAL(id))
 469                 return ((uint64_t)id);
 470
 471         ksid = crgetsid(cr, (type == ZFS_OWNER) ? KSID_OWNER : KSID_GROUP);
 472
 473         VERIFY(ksid != NULL);
 474         rid = ksid_getrid(ksid);
 475         domain = ksid_getdomain(ksid);
 476
 477         idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, tx);
 478
 479         zfs_fuid_node_add(fuidp, kdomain, rid, idx, id, type);
 480
 481         return (FUID_ENCODE(idx, rid));
 482 }
 483
 484 /*
 485  * Create a file system FUID for an ACL ace
 486  * or a chown/chgrp of the file.
 487  * This is similar to zfs_fuid_create_cred, except that
 488  * we can't find the domain + rid information in the
 489  * cred.  Instead we have to query Winchester for the
 490  * domain and rid.
 491  *
 492  * During replay operations the domain+rid information is
 493  * found in the zfs_fuid_info_t that the replay code has
 494  * attached to the zfsvfs of the file system.
 495  */
 496 uint64_t
 497 zfs_fuid_create(zfsvfs_t *zfsvfs, uint64_t id, cred_t *cr,
 498     zfs_fuid_type_t type, dmu_tx_t *tx, zfs_fuid_info_t **fuidpp)
 499 {
 500         const char *domain;
 501         char *kdomain;
 502         uint32_t fuid_idx = FUID_INDEX(id);
 503         uint32_t rid;
 504         idmap_stat status;
 505         uint64_t idx;
 506         boolean_t is_replay = (zfsvfs->z_assign >= TXG_INITIAL);
 507         zfs_fuid_t *zfuid = NULL;
 508         zfs_fuid_info_t *fuidp;
 509
 510         /*
 511          * If POSIX ID, or entry is already a FUID then
 512          * just return the id
 513          *
 514          * We may also be handed an already FUID'ized id via
 515          * chmod.
 516          */
 517
 518         if (!zfsvfs->z_use_fuids || !IS_EPHEMERAL(id) || fuid_idx != 0)
 519                 return (id);
 520
 521         if (is_replay) {
 522                 fuidp = zfsvfs->z_fuid_replay;
 523
 524                 /*
 525                  * If we are passed an ephemeral id, but no
 526                  * fuid_info was logged then return NOBODY.
 527                  * This is most likely a result of idmap service
 528                  * not being available.
 529                  */
 530                 if (fuidp == NULL)
 531                         return (UID_NOBODY);
 532
 533                 switch (type) {
 534                 case ZFS_ACE_USER:
 535                 case ZFS_ACE_GROUP:
 536                         zfuid = list_head(&fuidp->z_fuids);
 537                         rid = FUID_RID(zfuid->z_logfuid);
 538                         idx = FUID_INDEX(zfuid->z_logfuid);
 539                         break;
 540                 case ZFS_OWNER:
 541                         rid = FUID_RID(fuidp->z_fuid_owner);
 542                         idx = FUID_INDEX(fuidp->z_fuid_owner);
 543                         break;
 544                 case ZFS_GROUP:
 545                         rid = FUID_RID(fuidp->z_fuid_group);
 546                         idx = FUID_INDEX(fuidp->z_fuid_group);
 547                         break;
 548                 };
 549                 domain = fuidp->z_domain_table[idx -1];
 550         } else {
 551                 if (type == ZFS_OWNER || type == ZFS_ACE_USER)
 552                         status = kidmap_getsidbyuid(crgetzone(cr), id,
 553                             &domain, &rid);
 554                 else
 555                         status = kidmap_getsidbygid(crgetzone(cr), id,
 556                             &domain, &rid);
 557
 558                 if (status != 0) {
 559                         /*
 560                          * When returning nobody we will need to
 561                          * make a dummy fuid table entry for logging
 562                          * purposes.
 563                          */
 564                         rid = UID_NOBODY;
 565                         domain = "";
 566                 }
 567         }
 568
 569         idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, tx);
 570
 571         if (!is_replay)
 572                 zfs_fuid_node_add(fuidpp, kdomain, rid, idx, id, type);
 573         else if (zfuid != NULL) {
 574                 list_remove(&fuidp->z_fuids, zfuid);
 575                 kmem_free(zfuid, sizeof (zfs_fuid_t));
 576         }
 577         return (FUID_ENCODE(idx, rid));
 578 }
 579
 580 void
 581 zfs_fuid_destroy(zfsvfs_t *zfsvfs)
 582 {
 583         rw_enter(&zfsvfs->z_fuid_lock, RW_WRITER);
 584         if (!zfsvfs->z_fuid_loaded) {
 585                 rw_exit(&zfsvfs->z_fuid_lock);
 586                 return;
 587         }
 588         zfs_fuid_table_destroy(&zfsvfs->z_fuid_idx, &zfsvfs->z_fuid_domain);
 589         rw_exit(&zfsvfs->z_fuid_lock);
 590 }
 591
 592 /*
 593  * Allocate zfs_fuid_info for tracking FUIDs created during
 594  * zfs_mknode, VOP_SETATTR() or VOP_SETSECATTR()
 595  */
 596 zfs_fuid_info_t *
 597 zfs_fuid_info_alloc(void)
 598 {
 599         zfs_fuid_info_t *fuidp;
 600
 601         fuidp = kmem_zalloc(sizeof (zfs_fuid_info_t), KM_SLEEP);
 602         list_create(&fuidp->z_domains, sizeof (zfs_fuid_domain_t),
 603             offsetof(zfs_fuid_domain_t, z_next));
 604         list_create(&fuidp->z_fuids, sizeof (zfs_fuid_t),
 605             offsetof(zfs_fuid_t, z_next));
 606         return (fuidp);
 607 }
 608
 609 /*
 610  * Release all memory associated with zfs_fuid_info_t
 611  */
 612 void
 613 zfs_fuid_info_free(zfs_fuid_info_t *fuidp)
 614 {
 615         zfs_fuid_t *zfuid;
 616         zfs_fuid_domain_t *zdomain;
 617
 618         while ((zfuid = list_head(&fuidp->z_fuids)) != NULL) {
 619                 list_remove(&fuidp->z_fuids, zfuid);
 620                 kmem_free(zfuid, sizeof (zfs_fuid_t));
 621         }
 622
 623         if (fuidp->z_domain_table != NULL)
 624                 kmem_free(fuidp->z_domain_table,
 625                     (sizeof (char **)) * fuidp->z_domain_cnt);
 626
 627         while ((zdomain = list_head(&fuidp->z_domains)) != NULL) {
 628                 list_remove(&fuidp->z_domains, zdomain);
 629                 kmem_free(zdomain, sizeof (zfs_fuid_domain_t));
 630         }
 631
 632         kmem_free(fuidp, sizeof (zfs_fuid_info_t));
 633 }
 634
 635 /*
 636  * Check to see if id is a groupmember.  If cred
 637  * has ksid info then sidlist is checked first
 638  * and if still not found then POSIX groups are checked
 639  *
 640  * Will use a straight FUID compare when possible.
 641  */
 642 boolean_t
 643 zfs_groupmember(zfsvfs_t *zfsvfs, uint64_t id, cred_t *cr)
 644 {
 645         ksid_t          *ksid = crgetsid(cr, KSID_GROUP);
 646         uid_t           gid;
 647
 648         if (ksid) {
 649                 int             i;
 650                 ksid_t          *ksid_groups;
 651                 ksidlist_t      *ksidlist = crgetsidlist(cr);
 652                 uint32_t        idx = FUID_INDEX(id);
 653                 uint32_t        rid = FUID_RID(id);
 654
 655                 ASSERT(ksidlist);
 656                 ksid_groups = ksidlist->ksl_sids;
 657
 658                 for (i = 0; i != ksidlist->ksl_nsid; i++) {
 659                         if (idx == 0) {
 660                                 if (id != IDMAP_WK_CREATOR_GROUP_GID &&
 661                                     id == ksid_groups[i].ks_id) {
 662                                         return (B_TRUE);
 663                                 }
 664                         } else {
 665                                 char *domain;
 666
 667                                 domain = zfs_fuid_find_by_idx(zfsvfs, idx);
 668                                 ASSERT(domain != NULL);
 669
 670                                 if (strcmp(domain,
 671                                     IDMAP_WK_CREATOR_SID_AUTHORITY) == 0)
 672                                         return (B_FALSE);
 673
 674                                 if ((strcmp(domain,
 675                                     ksid_groups[i].ks_domain->kd_name) == 0) &&
 676                                     rid == ksid_groups[i].ks_rid)
 677                                         return (B_TRUE);
 678                         }
 679                 }
 680         }
 681
 682         /*
 683          * Not found in ksidlist, check posix groups
 684          */
 685         gid = zfs_fuid_map_id(zfsvfs, id, cr, ZFS_GROUP);
 686         return (groupmember(gid, cr));
 687 }
 688 #endif