module/zfs/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 #include <sys/zfs_context.h>
  27 #include <sys/sunddi.h>
  28 #include <sys/dmu.h>
  29 #include <sys/avl.h>
  30 #include <sys/zap.h>
  31 #include <sys/refcount.h>
  32 #include <sys/nvpair.h>
  33 #ifdef _KERNEL
  34 #include <sys/kidmap.h>
  35 #include <sys/sid.h>
  36 #include <sys/zfs_vfsops.h>
  37 #include <sys/zfs_znode.h>
  38 #endif
  39 #include <sys/zfs_fuid.h>
  40
  41 /*
  42  * FUID Domain table(s).
  43  *
  44  * The FUID table is stored as a packed nvlist of an array
  45  * of nvlists which contain an index, domain string and offset
  46  *
  47  * During file system initialization the nvlist(s) are read and
  48  * two AVL trees are created.  One tree is keyed by the index number
  49  * and the other by the domain string.  Nodes are never removed from
  50  * trees, but new entries may be added.  If a new entry is added then the
  51  * on-disk packed nvlist will also be updated.
  52  */
  53
  54 #define FUID_IDX        "fuid_idx"
  55 #define FUID_DOMAIN     "fuid_domain"
  56 #define FUID_OFFSET     "fuid_offset"
  57 #define FUID_NVP_ARRAY  "fuid_nvlist"
  58
  59 typedef struct fuid_domain {
  60         avl_node_t      f_domnode;
  61         avl_node_t      f_idxnode;
  62         ksiddomain_t    *f_ksid;
  63         uint64_t        f_idx;
  64 } fuid_domain_t;
  65
  66 static char *nulldomain = "";
  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 ? findnode->f_ksid->kd_name : nulldomain);
 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         if (zfsvfs->z_fuid_obj != 0) {
 220                 zfsvfs->z_fuid_size = zfs_fuid_table_load(zfsvfs->z_os,
 221                     zfsvfs->z_fuid_obj, &zfsvfs->z_fuid_idx,
 222                     &zfsvfs->z_fuid_domain);
 223                 zfsvfs->z_fuid_loaded = B_TRUE;
 224         }
 225
 226         rw_exit(&zfsvfs->z_fuid_lock);
 227 }
 228
 229 /*
 230  * Query domain table for a given domain.
 231  *
 232  * If domain isn't found it is added to AVL trees and
 233  * the results are pushed out to disk.
 234  */
 235 int
 236 zfs_fuid_find_by_domain(zfsvfs_t *zfsvfs, const char *domain, char **retdomain,
 237     dmu_tx_t *tx)
 238 {
 239         fuid_domain_t searchnode, *findnode;
 240         avl_index_t loc;
 241         krw_t rw = RW_READER;
 242
 243         /*
 244          * If the dummy "nobody" domain then return an index of 0
 245          * to cause the created FUID to be a standard POSIX id
 246          * for the user nobody.
 247          */
 248         if (domain[0] == '\0') {
 249                 *retdomain = nulldomain;
 250                 return (0);
 251         }
 252
 253         searchnode.f_ksid = ksid_lookupdomain(domain);
 254         if (retdomain) {
 255                 *retdomain = searchnode.f_ksid->kd_name;
 256         }
 257         if (!zfsvfs->z_fuid_loaded)
 258                 zfs_fuid_init(zfsvfs, tx);
 259
 260 retry:
 261         rw_enter(&zfsvfs->z_fuid_lock, rw);
 262         findnode = avl_find(&zfsvfs->z_fuid_domain, &searchnode, &loc);
 263
 264         if (findnode) {
 265                 rw_exit(&zfsvfs->z_fuid_lock);
 266                 ksiddomain_rele(searchnode.f_ksid);
 267                 return (findnode->f_idx);
 268         } else {
 269                 fuid_domain_t *domnode;
 270                 nvlist_t *nvp;
 271                 nvlist_t **fuids;
 272                 uint64_t retidx;
 273                 size_t nvsize = 0;
 274                 char *packed;
 275                 dmu_buf_t *db;
 276                 int i = 0;
 277
 278                 if (rw == RW_READER && !rw_tryupgrade(&zfsvfs->z_fuid_lock)) {
 279                         rw_exit(&zfsvfs->z_fuid_lock);
 280                         rw = RW_WRITER;
 281                         goto retry;
 282                 }
 283
 284                 domnode = kmem_alloc(sizeof (fuid_domain_t), KM_SLEEP);
 285                 domnode->f_ksid = searchnode.f_ksid;
 286
 287                 retidx = domnode->f_idx = avl_numnodes(&zfsvfs->z_fuid_idx) + 1;
 288
 289                 avl_add(&zfsvfs->z_fuid_domain, domnode);
 290                 avl_add(&zfsvfs->z_fuid_idx, domnode);
 291                 /*
 292                  * Now resync the on-disk nvlist.
 293                  */
 294                 VERIFY(nvlist_alloc(&nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
 295
 296                 domnode = avl_first(&zfsvfs->z_fuid_domain);
 297                 fuids = kmem_alloc(retidx * sizeof (void *), KM_SLEEP);
 298                 while (domnode) {
 299                         VERIFY(nvlist_alloc(&fuids[i],
 300                             NV_UNIQUE_NAME, KM_SLEEP) == 0);
 301                         VERIFY(nvlist_add_uint64(fuids[i], FUID_IDX,
 302                             domnode->f_idx) == 0);
 303                         VERIFY(nvlist_add_uint64(fuids[i],
 304                             FUID_OFFSET, 0) == 0);
 305                         VERIFY(nvlist_add_string(fuids[i++], FUID_DOMAIN,
 306                             domnode->f_ksid->kd_name) == 0);
 307                         domnode = AVL_NEXT(&zfsvfs->z_fuid_domain, domnode);
 308                 }
 309                 VERIFY(nvlist_add_nvlist_array(nvp, FUID_NVP_ARRAY,
 310                     fuids, retidx) == 0);
 311                 for (i = 0; i != retidx; i++)
 312                         nvlist_free(fuids[i]);
 313                 kmem_free(fuids, retidx * sizeof (void *));
 314                 VERIFY(nvlist_size(nvp, &nvsize, NV_ENCODE_XDR) == 0);
 315                 packed = kmem_alloc(nvsize, KM_SLEEP);
 316                 VERIFY(nvlist_pack(nvp, &packed, &nvsize,
 317                     NV_ENCODE_XDR, KM_SLEEP) == 0);
 318                 nvlist_free(nvp);
 319                 zfsvfs->z_fuid_size = nvsize;
 320                 dmu_write(zfsvfs->z_os, zfsvfs->z_fuid_obj, 0,
 321                     zfsvfs->z_fuid_size, packed, tx);
 322                 kmem_free(packed, zfsvfs->z_fuid_size);
 323                 VERIFY(0 == dmu_bonus_hold(zfsvfs->z_os, zfsvfs->z_fuid_obj,
 324                     FTAG, &db));
 325                 dmu_buf_will_dirty(db, tx);
 326                 *(uint64_t *)db->db_data = zfsvfs->z_fuid_size;
 327                 dmu_buf_rele(db, FTAG);
 328
 329                 rw_exit(&zfsvfs->z_fuid_lock);
 330                 return (retidx);
 331         }
 332 }
 333
 334 /*
 335  * Query domain table by index, returning domain string
 336  *
 337  * Returns a pointer from an avl node of the domain string.
 338  *
 339  */
 340 static char *
 341 zfs_fuid_find_by_idx(zfsvfs_t *zfsvfs, uint32_t idx)
 342 {
 343         char *domain;
 344
 345         if (idx == 0 || !zfsvfs->z_use_fuids)
 346                 return (NULL);
 347
 348         if (!zfsvfs->z_fuid_loaded)
 349                 zfs_fuid_init(zfsvfs, NULL);
 350
 351         rw_enter(&zfsvfs->z_fuid_lock, RW_READER);
 352
 353         if (zfsvfs->z_fuid_obj)
 354                 domain = zfs_fuid_idx_domain(&zfsvfs->z_fuid_idx, idx);
 355         else
 356                 domain = nulldomain;
 357         rw_exit(&zfsvfs->z_fuid_lock);
 358
 359         ASSERT(domain);
 360         return (domain);
 361 }
 362
 363 void
 364 zfs_fuid_map_ids(znode_t *zp, cred_t *cr, uid_t *uidp, uid_t *gidp)
 365 {
 366         *uidp = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_phys->zp_uid,
 367             cr, ZFS_OWNER);
 368         *gidp = zfs_fuid_map_id(zp->z_zfsvfs, zp->z_phys->zp_gid,
 369             cr, ZFS_GROUP);
 370 }
 371
 372 uid_t
 373 zfs_fuid_map_id(zfsvfs_t *zfsvfs, uint64_t fuid,
 374     cred_t *cr, zfs_fuid_type_t type)
 375 {
 376         uint32_t index = FUID_INDEX(fuid);
 377         char *domain;
 378         uid_t id;
 379
 380         if (index == 0)
 381                 return (fuid);
 382
 383         domain = zfs_fuid_find_by_idx(zfsvfs, index);
 384         ASSERT(domain != NULL);
 385
 386         if (type == ZFS_OWNER || type == ZFS_ACE_USER) {
 387                 (void) kidmap_getuidbysid(crgetzone(cr), domain,
 388                     FUID_RID(fuid), &id);
 389         } else {
 390                 (void) kidmap_getgidbysid(crgetzone(cr), domain,
 391                     FUID_RID(fuid), &id);
 392         }
 393         return (id);
 394 }
 395
 396 /*
 397  * Add a FUID node to the list of fuid's being created for this
 398  * ACL
 399  *
 400  * If ACL has multiple domains, then keep only one copy of each unique
 401  * domain.
 402  */
 403 static void
 404 zfs_fuid_node_add(zfs_fuid_info_t **fuidpp, const char *domain, uint32_t rid,
 405     uint64_t idx, uint64_t id, zfs_fuid_type_t type)
 406 {
 407         zfs_fuid_t *fuid;
 408         zfs_fuid_domain_t *fuid_domain;
 409         zfs_fuid_info_t *fuidp;
 410         uint64_t fuididx;
 411         boolean_t found = B_FALSE;
 412
 413         if (*fuidpp == NULL)
 414                 *fuidpp = zfs_fuid_info_alloc();
 415
 416         fuidp = *fuidpp;
 417         /*
 418          * First find fuid domain index in linked list
 419          *
 420          * If one isn't found then create an entry.
 421          */
 422
 423         for (fuididx = 1, fuid_domain = list_head(&fuidp->z_domains);
 424             fuid_domain; fuid_domain = list_next(&fuidp->z_domains,
 425             fuid_domain), fuididx++) {
 426                 if (idx == fuid_domain->z_domidx) {
 427                         found = B_TRUE;
 428                         break;
 429                 }
 430         }
 431
 432         if (!found) {
 433                 fuid_domain = kmem_alloc(sizeof (zfs_fuid_domain_t), KM_SLEEP);
 434                 fuid_domain->z_domain = domain;
 435                 fuid_domain->z_domidx = idx;
 436                 list_insert_tail(&fuidp->z_domains, fuid_domain);
 437                 fuidp->z_domain_str_sz += strlen(domain) + 1;
 438                 fuidp->z_domain_cnt++;
 439         }
 440
 441         if (type == ZFS_ACE_USER || type == ZFS_ACE_GROUP) {
 442                 /*
 443                  * Now allocate fuid entry and add it on the end of the list
 444                  */
 445
 446                 fuid = kmem_alloc(sizeof (zfs_fuid_t), KM_SLEEP);
 447                 fuid->z_id = id;
 448                 fuid->z_domidx = idx;
 449                 fuid->z_logfuid = FUID_ENCODE(fuididx, rid);
 450
 451                 list_insert_tail(&fuidp->z_fuids, fuid);
 452                 fuidp->z_fuid_cnt++;
 453         } else {
 454                 if (type == ZFS_OWNER)
 455                         fuidp->z_fuid_owner = FUID_ENCODE(fuididx, rid);
 456                 else
 457                         fuidp->z_fuid_group = FUID_ENCODE(fuididx, rid);
 458         }
 459 }
 460
 461 /*
 462  * Create a file system FUID, based on information in the users cred
 463  */
 464 uint64_t
 465 zfs_fuid_create_cred(zfsvfs_t *zfsvfs, zfs_fuid_type_t type,
 466     dmu_tx_t *tx, cred_t *cr, zfs_fuid_info_t **fuidp)
 467 {
 468         uint64_t        idx;
 469         ksid_t          *ksid;
 470         uint32_t        rid;
 471         char            *kdomain;
 472         const char      *domain;
 473         uid_t           id;
 474
 475         VERIFY(type == ZFS_OWNER || type == ZFS_GROUP);
 476
 477         ksid = crgetsid(cr, (type == ZFS_OWNER) ? KSID_OWNER : KSID_GROUP);
 478         if (ksid) {
 479                 id = ksid_getid(ksid);
 480         } else {
 481                 if (type == ZFS_OWNER)
 482                         id = crgetuid(cr);
 483                 else
 484                         id = crgetgid(cr);
 485         }
 486
 487         if (!zfsvfs->z_use_fuids || (!IS_EPHEMERAL(id)))
 488                 return ((uint64_t)id);
 489
 490         rid = ksid_getrid(ksid);
 491         domain = ksid_getdomain(ksid);
 492
 493         idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, tx);
 494
 495         zfs_fuid_node_add(fuidp, kdomain, rid, idx, id, type);
 496
 497         return (FUID_ENCODE(idx, rid));
 498 }
 499
 500 /*
 501  * Create a file system FUID for an ACL ace
 502  * or a chown/chgrp of the file.
 503  * This is similar to zfs_fuid_create_cred, except that
 504  * we can't find the domain + rid information in the
 505  * cred.  Instead we have to query Winchester for the
 506  * domain and rid.
 507  *
 508  * During replay operations the domain+rid information is
 509  * found in the zfs_fuid_info_t that the replay code has
 510  * attached to the zfsvfs of the file system.
 511  */
 512 uint64_t
 513 zfs_fuid_create(zfsvfs_t *zfsvfs, uint64_t id, cred_t *cr,
 514     zfs_fuid_type_t type, dmu_tx_t *tx, zfs_fuid_info_t **fuidpp)
 515 {
 516         const char *domain;
 517         char *kdomain;
 518         uint32_t fuid_idx = FUID_INDEX(id);
 519         uint32_t rid;
 520         idmap_stat status;
 521         uint64_t idx;
 522         zfs_fuid_t *zfuid = NULL;
 523         zfs_fuid_info_t *fuidp;
 524
 525         /*
 526          * If POSIX ID, or entry is already a FUID then
 527          * just return the id
 528          *
 529          * We may also be handed an already FUID'ized id via
 530          * chmod.
 531          */
 532
 533         if (!zfsvfs->z_use_fuids || !IS_EPHEMERAL(id) || fuid_idx != 0)
 534                 return (id);
 535
 536         if (zfsvfs->z_replay) {
 537                 fuidp = zfsvfs->z_fuid_replay;
 538
 539                 /*
 540                  * If we are passed an ephemeral id, but no
 541                  * fuid_info was logged then return NOBODY.
 542                  * This is most likely a result of idmap service
 543                  * not being available.
 544                  */
 545                 if (fuidp == NULL)
 546                         return (UID_NOBODY);
 547
 548                 switch (type) {
 549                 case ZFS_ACE_USER:
 550                 case ZFS_ACE_GROUP:
 551                         zfuid = list_head(&fuidp->z_fuids);
 552                         rid = FUID_RID(zfuid->z_logfuid);
 553                         idx = FUID_INDEX(zfuid->z_logfuid);
 554                         break;
 555                 case ZFS_OWNER:
 556                         rid = FUID_RID(fuidp->z_fuid_owner);
 557                         idx = FUID_INDEX(fuidp->z_fuid_owner);
 558                         break;
 559                 case ZFS_GROUP:
 560                         rid = FUID_RID(fuidp->z_fuid_group);
 561                         idx = FUID_INDEX(fuidp->z_fuid_group);
 562                         break;
 563                 };
 564                 domain = fuidp->z_domain_table[idx -1];
 565         } else {
 566                 if (type == ZFS_OWNER || type == ZFS_ACE_USER)
 567                         status = kidmap_getsidbyuid(crgetzone(cr), id,
 568                             &domain, &rid);
 569                 else
 570                         status = kidmap_getsidbygid(crgetzone(cr), id,
 571                             &domain, &rid);
 572
 573                 if (status != 0) {
 574                         /*
 575                          * When returning nobody we will need to
 576                          * make a dummy fuid table entry for logging
 577                          * purposes.
 578                          */
 579                         rid = UID_NOBODY;
 580                         domain = nulldomain;
 581                 }
 582         }
 583
 584         idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, tx);
 585
 586         if (!zfsvfs->z_replay)
 587                 zfs_fuid_node_add(fuidpp, kdomain, rid, idx, id, type);
 588         else if (zfuid != NULL) {
 589                 list_remove(&fuidp->z_fuids, zfuid);
 590                 kmem_free(zfuid, sizeof (zfs_fuid_t));
 591         }
 592         return (FUID_ENCODE(idx, rid));
 593 }
 594
 595 void
 596 zfs_fuid_destroy(zfsvfs_t *zfsvfs)
 597 {
 598         rw_enter(&zfsvfs->z_fuid_lock, RW_WRITER);
 599         if (!zfsvfs->z_fuid_loaded) {
 600                 rw_exit(&zfsvfs->z_fuid_lock);
 601                 return;
 602         }
 603         zfs_fuid_table_destroy(&zfsvfs->z_fuid_idx, &zfsvfs->z_fuid_domain);
 604         rw_exit(&zfsvfs->z_fuid_lock);
 605 }
 606
 607 /*
 608  * Allocate zfs_fuid_info for tracking FUIDs created during
 609  * zfs_mknode, VOP_SETATTR() or VOP_SETSECATTR()
 610  */
 611 zfs_fuid_info_t *
 612 zfs_fuid_info_alloc(void)
 613 {
 614         zfs_fuid_info_t *fuidp;
 615
 616         fuidp = kmem_zalloc(sizeof (zfs_fuid_info_t), KM_SLEEP);
 617         list_create(&fuidp->z_domains, sizeof (zfs_fuid_domain_t),
 618             offsetof(zfs_fuid_domain_t, z_next));
 619         list_create(&fuidp->z_fuids, sizeof (zfs_fuid_t),
 620             offsetof(zfs_fuid_t, z_next));
 621         return (fuidp);
 622 }
 623
 624 /*
 625  * Release all memory associated with zfs_fuid_info_t
 626  */
 627 void
 628 zfs_fuid_info_free(zfs_fuid_info_t *fuidp)
 629 {
 630         zfs_fuid_t *zfuid;
 631         zfs_fuid_domain_t *zdomain;
 632
 633         while ((zfuid = list_head(&fuidp->z_fuids)) != NULL) {
 634                 list_remove(&fuidp->z_fuids, zfuid);
 635                 kmem_free(zfuid, sizeof (zfs_fuid_t));
 636         }
 637
 638         if (fuidp->z_domain_table != NULL)
 639                 kmem_free(fuidp->z_domain_table,
 640                     (sizeof (char **)) * fuidp->z_domain_cnt);
 641
 642         while ((zdomain = list_head(&fuidp->z_domains)) != NULL) {
 643                 list_remove(&fuidp->z_domains, zdomain);
 644                 kmem_free(zdomain, sizeof (zfs_fuid_domain_t));
 645         }
 646
 647         kmem_free(fuidp, sizeof (zfs_fuid_info_t));
 648 }
 649
 650 /*
 651  * Check to see if id is a groupmember.  If cred
 652  * has ksid info then sidlist is checked first
 653  * and if still not found then POSIX groups are checked
 654  *
 655  * Will use a straight FUID compare when possible.
 656  */
 657 boolean_t
 658 zfs_groupmember(zfsvfs_t *zfsvfs, uint64_t id, cred_t *cr)
 659 {
 660         ksid_t          *ksid = crgetsid(cr, KSID_GROUP);
 661         uid_t           gid;
 662
 663         if (ksid) {
 664                 int             i;
 665                 ksid_t          *ksid_groups;
 666                 ksidlist_t      *ksidlist = crgetsidlist(cr);
 667                 uint32_t        idx = FUID_INDEX(id);
 668                 uint32_t        rid = FUID_RID(id);
 669
 670                 ASSERT(ksidlist);
 671                 ksid_groups = ksidlist->ksl_sids;
 672
 673                 for (i = 0; i != ksidlist->ksl_nsid; i++) {
 674                         if (idx == 0) {
 675                                 if (id != IDMAP_WK_CREATOR_GROUP_GID &&
 676                                     id == ksid_groups[i].ks_id) {
 677                                         return (B_TRUE);
 678                                 }
 679                         } else {
 680                                 char *domain;
 681
 682                                 domain = zfs_fuid_find_by_idx(zfsvfs, idx);
 683                                 ASSERT(domain != NULL);
 684
 685                                 if (strcmp(domain,
 686                                     IDMAP_WK_CREATOR_SID_AUTHORITY) == 0)
 687                                         return (B_FALSE);
 688
 689                                 if ((strcmp(domain,
 690                                     ksid_groups[i].ks_domain->kd_name) == 0) &&
 691                                     rid == ksid_groups[i].ks_rid)
 692                                         return (B_TRUE);
 693                         }
 694                 }
 695         }
 696
 697         /*
 698          * Not found in ksidlist, check posix groups
 699          */
 700         gid = zfs_fuid_map_id(zfsvfs, id, cr, ZFS_GROUP);
 701         return (groupmember(gid, cr));
 702 }
 703 #endif