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 https://opensource.org/licenses/CDDL-1.0.
  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 (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  23  */
  24
  25 #include <sys/zfs_context.h>
  26 #include <sys/dmu.h>
  27 #include <sys/avl.h>
  28 #include <sys/zap.h>
  29 #include <sys/nvpair.h>
  30 #ifdef _KERNEL
  31 #include <sys/sid.h>
  32 #include <sys/zfs_vfsops.h>
  33 #include <sys/zfs_znode.h>
  34 #endif
  35 #include <sys/zfs_fuid.h>
  36
  37 /*
  38  * FUID Domain table(s).
  39  *
  40  * The FUID table is stored as a packed nvlist of an array
  41  * of nvlists which contain an index, domain string and offset
  42  *
  43  * During file system initialization the nvlist(s) are read and
  44  * two AVL trees are created.  One tree is keyed by the index number
  45  * and the other by the domain string.  Nodes are never removed from
  46  * trees, but new entries may be added.  If a new entry is added then
  47  * the zfsvfs->z_fuid_dirty flag is set to true and the caller will then
  48  * be responsible for calling zfs_fuid_sync() to sync the changes to disk.
  49  *
  50  */
  51
  52 #define FUID_IDX        "fuid_idx"
  53 #define FUID_DOMAIN     "fuid_domain"
  54 #define FUID_OFFSET     "fuid_offset"
  55 #define FUID_NVP_ARRAY  "fuid_nvlist"
  56
  57 typedef struct fuid_domain {
  58         avl_node_t      f_domnode;
  59         avl_node_t      f_idxnode;
  60         ksiddomain_t    *f_ksid;
  61         uint64_t        f_idx;
  62 } fuid_domain_t;
  63
  64 static const char *const nulldomain = "";
  65
  66 /*
  67  * Compare two indexes.
  68  */
  69 static int
  70 idx_compare(const void *arg1, const void *arg2)
  71 {
  72         const fuid_domain_t *node1 = (const fuid_domain_t *)arg1;
  73         const fuid_domain_t *node2 = (const fuid_domain_t *)arg2;
  74
  75         return (TREE_CMP(node1->f_idx, node2->f_idx));
  76 }
  77
  78 /*
  79  * Compare two domain strings.
  80  */
  81 static int
  82 domain_compare(const void *arg1, const void *arg2)
  83 {
  84         const fuid_domain_t *node1 = (const fuid_domain_t *)arg1;
  85         const fuid_domain_t *node2 = (const fuid_domain_t *)arg2;
  86         int val;
  87
  88         val = strcmp(node1->f_ksid->kd_name, node2->f_ksid->kd_name);
  89
  90         return (TREE_ISIGN(val));
  91 }
  92
  93 void
  94 zfs_fuid_avl_tree_create(avl_tree_t *idx_tree, avl_tree_t *domain_tree)
  95 {
  96         avl_create(idx_tree, idx_compare,
  97             sizeof (fuid_domain_t), offsetof(fuid_domain_t, f_idxnode));
  98         avl_create(domain_tree, domain_compare,
  99             sizeof (fuid_domain_t), offsetof(fuid_domain_t, f_domnode));
 100 }
 101
 102 /*
 103  * load initial fuid domain and idx trees.  This function is used by
 104  * both the kernel and zdb.
 105  */
 106 uint64_t
 107 zfs_fuid_table_load(objset_t *os, uint64_t fuid_obj, avl_tree_t *idx_tree,
 108     avl_tree_t *domain_tree)
 109 {
 110         dmu_buf_t *db;
 111         uint64_t fuid_size;
 112
 113         ASSERT(fuid_obj != 0);
 114         VERIFY(0 == dmu_bonus_hold(os, fuid_obj,
 115             FTAG, &db));
 116         fuid_size = *(uint64_t *)db->db_data;
 117         dmu_buf_rele(db, FTAG);
 118
 119         if (fuid_size)  {
 120                 nvlist_t **fuidnvp;
 121                 nvlist_t *nvp = NULL;
 122                 uint_t count;
 123                 char *packed;
 124                 int i;
 125
 126                 packed = kmem_alloc(fuid_size, KM_SLEEP);
 127                 VERIFY(dmu_read(os, fuid_obj, 0,
 128                     fuid_size, packed, DMU_READ_PREFETCH) == 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                         const 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 const 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)
 193 {
 194         rw_enter(&zfsvfs->z_fuid_lock, RW_WRITER);
 195
 196         if (zfsvfs->z_fuid_loaded) {
 197                 rw_exit(&zfsvfs->z_fuid_lock);
 198                 return;
 199         }
 200
 201         zfs_fuid_avl_tree_create(&zfsvfs->z_fuid_idx, &zfsvfs->z_fuid_domain);
 202
 203         (void) zap_lookup(zfsvfs->z_os, MASTER_NODE_OBJ,
 204             ZFS_FUID_TABLES, 8, 1, &zfsvfs->z_fuid_obj);
 205         if (zfsvfs->z_fuid_obj != 0) {
 206                 zfsvfs->z_fuid_size = zfs_fuid_table_load(zfsvfs->z_os,
 207                     zfsvfs->z_fuid_obj, &zfsvfs->z_fuid_idx,
 208                     &zfsvfs->z_fuid_domain);
 209         }
 210
 211         zfsvfs->z_fuid_loaded = B_TRUE;
 212         rw_exit(&zfsvfs->z_fuid_lock);
 213 }
 214
 215 /*
 216  * sync out AVL trees to persistent storage.
 217  */
 218 void
 219 zfs_fuid_sync(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
 220 {
 221         nvlist_t *nvp;
 222         nvlist_t **fuids;
 223         size_t nvsize = 0;
 224         char *packed;
 225         dmu_buf_t *db;
 226         fuid_domain_t *domnode;
 227         int numnodes;
 228         int i;
 229
 230         if (!zfsvfs->z_fuid_dirty) {
 231                 return;
 232         }
 233
 234         rw_enter(&zfsvfs->z_fuid_lock, RW_WRITER);
 235
 236         /*
 237          * First see if table needs to be created?
 238          */
 239         if (zfsvfs->z_fuid_obj == 0) {
 240                 zfsvfs->z_fuid_obj = dmu_object_alloc(zfsvfs->z_os,
 241                     DMU_OT_FUID, 1 << 14, DMU_OT_FUID_SIZE,
 242                     sizeof (uint64_t), tx);
 243                 VERIFY(zap_add(zfsvfs->z_os, MASTER_NODE_OBJ,
 244                     ZFS_FUID_TABLES, sizeof (uint64_t), 1,
 245                     &zfsvfs->z_fuid_obj, tx) == 0);
 246         }
 247
 248         VERIFY(nvlist_alloc(&nvp, NV_UNIQUE_NAME, KM_SLEEP) == 0);
 249
 250         numnodes = avl_numnodes(&zfsvfs->z_fuid_idx);
 251         fuids = kmem_alloc(numnodes * sizeof (void *), KM_SLEEP);
 252         for (i = 0, domnode = avl_first(&zfsvfs->z_fuid_domain); domnode; i++,
 253             domnode = AVL_NEXT(&zfsvfs->z_fuid_domain, domnode)) {
 254                 VERIFY(nvlist_alloc(&fuids[i], NV_UNIQUE_NAME, KM_SLEEP) == 0);
 255                 VERIFY(nvlist_add_uint64(fuids[i], FUID_IDX,
 256                     domnode->f_idx) == 0);
 257                 VERIFY(nvlist_add_uint64(fuids[i], FUID_OFFSET, 0) == 0);
 258                 VERIFY(nvlist_add_string(fuids[i], FUID_DOMAIN,
 259                     domnode->f_ksid->kd_name) == 0);
 260         }
 261         fnvlist_add_nvlist_array(nvp, FUID_NVP_ARRAY,
 262             (const nvlist_t * const *)fuids, numnodes);
 263         for (i = 0; i != numnodes; i++)
 264                 nvlist_free(fuids[i]);
 265         kmem_free(fuids, numnodes * sizeof (void *));
 266         VERIFY(nvlist_size(nvp, &nvsize, NV_ENCODE_XDR) == 0);
 267         packed = kmem_alloc(nvsize, KM_SLEEP);
 268         VERIFY(nvlist_pack(nvp, &packed, &nvsize,
 269             NV_ENCODE_XDR, KM_SLEEP) == 0);
 270         nvlist_free(nvp);
 271         zfsvfs->z_fuid_size = nvsize;
 272         dmu_write(zfsvfs->z_os, zfsvfs->z_fuid_obj, 0,
 273             zfsvfs->z_fuid_size, packed, tx);
 274         kmem_free(packed, zfsvfs->z_fuid_size);
 275         VERIFY(0 == dmu_bonus_hold(zfsvfs->z_os, zfsvfs->z_fuid_obj,
 276             FTAG, &db));
 277         dmu_buf_will_dirty(db, tx);
 278         *(uint64_t *)db->db_data = zfsvfs->z_fuid_size;
 279         dmu_buf_rele(db, FTAG);
 280
 281         zfsvfs->z_fuid_dirty = B_FALSE;
 282         rw_exit(&zfsvfs->z_fuid_lock);
 283 }
 284
 285 /*
 286  * Query domain table for a given domain.
 287  *
 288  * If domain isn't found and addok is set, it is added to AVL trees and
 289  * the zfsvfs->z_fuid_dirty flag will be set to TRUE.  It will then be
 290  * necessary for the caller or another thread to detect the dirty table
 291  * and sync out the changes.
 292  */
 293 static int
 294 zfs_fuid_find_by_domain(zfsvfs_t *zfsvfs, const char *domain,
 295     const char **retdomain, boolean_t addok)
 296 {
 297         fuid_domain_t searchnode, *findnode;
 298         avl_index_t loc;
 299         krw_t rw = RW_READER;
 300
 301         /*
 302          * If the dummy "nobody" domain then return an index of 0
 303          * to cause the created FUID to be a standard POSIX id
 304          * for the user nobody.
 305          */
 306         if (domain[0] == '\0') {
 307                 if (retdomain)
 308                         *retdomain = nulldomain;
 309                 return (0);
 310         }
 311
 312         searchnode.f_ksid = ksid_lookupdomain(domain);
 313         if (retdomain)
 314                 *retdomain = searchnode.f_ksid->kd_name;
 315         if (!zfsvfs->z_fuid_loaded)
 316                 zfs_fuid_init(zfsvfs);
 317
 318 retry:
 319         rw_enter(&zfsvfs->z_fuid_lock, rw);
 320         findnode = avl_find(&zfsvfs->z_fuid_domain, &searchnode, &loc);
 321
 322         if (findnode) {
 323                 rw_exit(&zfsvfs->z_fuid_lock);
 324                 ksiddomain_rele(searchnode.f_ksid);
 325                 return (findnode->f_idx);
 326         } else if (addok) {
 327                 fuid_domain_t *domnode;
 328                 uint64_t retidx;
 329
 330                 if (rw == RW_READER && !rw_tryupgrade(&zfsvfs->z_fuid_lock)) {
 331                         rw_exit(&zfsvfs->z_fuid_lock);
 332                         rw = RW_WRITER;
 333                         goto retry;
 334                 }
 335
 336                 domnode = kmem_alloc(sizeof (fuid_domain_t), KM_SLEEP);
 337                 domnode->f_ksid = searchnode.f_ksid;
 338
 339                 retidx = domnode->f_idx = avl_numnodes(&zfsvfs->z_fuid_idx) + 1;
 340
 341                 avl_add(&zfsvfs->z_fuid_domain, domnode);
 342                 avl_add(&zfsvfs->z_fuid_idx, domnode);
 343                 zfsvfs->z_fuid_dirty = B_TRUE;
 344                 rw_exit(&zfsvfs->z_fuid_lock);
 345                 return (retidx);
 346         } else {
 347                 rw_exit(&zfsvfs->z_fuid_lock);
 348                 return (-1);
 349         }
 350 }
 351
 352 /*
 353  * Query domain table by index, returning domain string
 354  *
 355  * Returns a pointer from an avl node of the domain string.
 356  *
 357  */
 358 const char *
 359 zfs_fuid_find_by_idx(zfsvfs_t *zfsvfs, uint32_t idx)
 360 {
 361         const char *domain;
 362
 363         if (idx == 0 || !zfsvfs->z_use_fuids)
 364                 return (NULL);
 365
 366         if (!zfsvfs->z_fuid_loaded)
 367                 zfs_fuid_init(zfsvfs);
 368
 369         rw_enter(&zfsvfs->z_fuid_lock, RW_READER);
 370
 371         if (zfsvfs->z_fuid_obj || zfsvfs->z_fuid_dirty)
 372                 domain = zfs_fuid_idx_domain(&zfsvfs->z_fuid_idx, idx);
 373         else
 374                 domain = nulldomain;
 375         rw_exit(&zfsvfs->z_fuid_lock);
 376
 377         ASSERT(domain);
 378         return (domain);
 379 }
 380
 381 void
 382 zfs_fuid_map_ids(znode_t *zp, cred_t *cr, uid_t *uidp, uid_t *gidp)
 383 {
 384         *uidp = zfs_fuid_map_id(ZTOZSB(zp), KUID_TO_SUID(ZTOUID(zp)),
 385             cr, ZFS_OWNER);
 386         *gidp = zfs_fuid_map_id(ZTOZSB(zp), KGID_TO_SGID(ZTOGID(zp)),
 387             cr, ZFS_GROUP);
 388 }
 389
 390 #ifdef __FreeBSD__
 391 uid_t
 392 zfs_fuid_map_id(zfsvfs_t *zfsvfs, uint64_t fuid,
 393     cred_t *cr, zfs_fuid_type_t type)
 394 {
 395         uint32_t index = FUID_INDEX(fuid);
 396
 397         if (index == 0)
 398                 return (fuid);
 399
 400         return (UID_NOBODY);
 401 }
 402 #elif defined(__linux__)
 403 uid_t
 404 zfs_fuid_map_id(zfsvfs_t *zfsvfs, uint64_t fuid,
 405     cred_t *cr, zfs_fuid_type_t type)
 406 {
 407         /*
 408          * The Linux port only supports POSIX IDs, use the passed id.
 409          */
 410         return (fuid);
 411 }
 412
 413 #else
 414 uid_t
 415 zfs_fuid_map_id(zfsvfs_t *zfsvfs, uint64_t fuid,
 416     cred_t *cr, zfs_fuid_type_t type)
 417 {
 418         uint32_t index = FUID_INDEX(fuid);
 419         const char *domain;
 420         uid_t id;
 421
 422         if (index == 0)
 423                 return (fuid);
 424
 425         domain = zfs_fuid_find_by_idx(zfsvfs, index);
 426         ASSERT(domain != NULL);
 427
 428         if (type == ZFS_OWNER || type == ZFS_ACE_USER) {
 429                 (void) kidmap_getuidbysid(crgetzone(cr), domain,
 430                     FUID_RID(fuid), &id);
 431         } else {
 432                 (void) kidmap_getgidbysid(crgetzone(cr), domain,
 433                     FUID_RID(fuid), &id);
 434         }
 435         return (id);
 436 }
 437 #endif
 438
 439 /*
 440  * Add a FUID node to the list of fuid's being created for this
 441  * ACL
 442  *
 443  * If ACL has multiple domains, then keep only one copy of each unique
 444  * domain.
 445  */
 446 void
 447 zfs_fuid_node_add(zfs_fuid_info_t **fuidpp, const char *domain, uint32_t rid,
 448     uint64_t idx, uint64_t id, zfs_fuid_type_t type)
 449 {
 450         zfs_fuid_t *fuid;
 451         zfs_fuid_domain_t *fuid_domain;
 452         zfs_fuid_info_t *fuidp;
 453         uint64_t fuididx;
 454         boolean_t found = B_FALSE;
 455
 456         if (*fuidpp == NULL)
 457                 *fuidpp = zfs_fuid_info_alloc();
 458
 459         fuidp = *fuidpp;
 460         /*
 461          * First find fuid domain index in linked list
 462          *
 463          * If one isn't found then create an entry.
 464          */
 465
 466         for (fuididx = 1, fuid_domain = list_head(&fuidp->z_domains);
 467             fuid_domain; fuid_domain = list_next(&fuidp->z_domains,
 468             fuid_domain), fuididx++) {
 469                 if (idx == fuid_domain->z_domidx) {
 470                         found = B_TRUE;
 471                         break;
 472                 }
 473         }
 474
 475         if (!found) {
 476                 fuid_domain = kmem_alloc(sizeof (zfs_fuid_domain_t), KM_SLEEP);
 477                 fuid_domain->z_domain = domain;
 478                 fuid_domain->z_domidx = idx;
 479                 list_insert_tail(&fuidp->z_domains, fuid_domain);
 480                 fuidp->z_domain_str_sz += strlen(domain) + 1;
 481                 fuidp->z_domain_cnt++;
 482         }
 483
 484         if (type == ZFS_ACE_USER || type == ZFS_ACE_GROUP) {
 485
 486                 /*
 487                  * Now allocate fuid entry and add it on the end of the list
 488                  */
 489
 490                 fuid = kmem_alloc(sizeof (zfs_fuid_t), KM_SLEEP);
 491                 fuid->z_id = id;
 492                 fuid->z_domidx = idx;
 493                 fuid->z_logfuid = FUID_ENCODE(fuididx, rid);
 494
 495                 list_insert_tail(&fuidp->z_fuids, fuid);
 496                 fuidp->z_fuid_cnt++;
 497         } else {
 498                 if (type == ZFS_OWNER)
 499                         fuidp->z_fuid_owner = FUID_ENCODE(fuididx, rid);
 500                 else
 501                         fuidp->z_fuid_group = FUID_ENCODE(fuididx, rid);
 502         }
 503 }
 504
 505 #ifdef HAVE_KSID
 506 /*
 507  * Create a file system FUID, based on information in the users cred
 508  *
 509  * If cred contains KSID_OWNER then it should be used to determine
 510  * the uid otherwise cred's uid will be used. By default cred's gid
 511  * is used unless it's an ephemeral ID in which case KSID_GROUP will
 512  * be used if it exists.
 513  */
 514 uint64_t
 515 zfs_fuid_create_cred(zfsvfs_t *zfsvfs, zfs_fuid_type_t type,
 516     cred_t *cr, zfs_fuid_info_t **fuidp)
 517 {
 518         uint64_t        idx;
 519         ksid_t          *ksid;
 520         uint32_t        rid;
 521         const char      *kdomain, *domain;
 522         uid_t           id;
 523
 524         VERIFY(type == ZFS_OWNER || type == ZFS_GROUP);
 525
 526         ksid = crgetsid(cr, (type == ZFS_OWNER) ? KSID_OWNER : KSID_GROUP);
 527
 528         if (!zfsvfs->z_use_fuids || (ksid == NULL)) {
 529                 id = (type == ZFS_OWNER) ? crgetuid(cr) : crgetgid(cr);
 530
 531                 if (IS_EPHEMERAL(id))
 532                         return ((type == ZFS_OWNER) ? UID_NOBODY : GID_NOBODY);
 533
 534                 return ((uint64_t)id);
 535         }
 536
 537         /*
 538          * ksid is present and FUID is supported
 539          */
 540         id = (type == ZFS_OWNER) ? ksid_getid(ksid) : crgetgid(cr);
 541
 542         if (!IS_EPHEMERAL(id))
 543                 return ((uint64_t)id);
 544
 545         if (type == ZFS_GROUP)
 546                 id = ksid_getid(ksid);
 547
 548         rid = ksid_getrid(ksid);
 549         domain = ksid_getdomain(ksid);
 550
 551         idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, B_TRUE);
 552
 553         zfs_fuid_node_add(fuidp, kdomain, rid, idx, id, type);
 554
 555         return (FUID_ENCODE(idx, rid));
 556 }
 557 #endif /* HAVE_KSID */
 558
 559 /*
 560  * Create a file system FUID for an ACL ace
 561  * or a chown/chgrp of the file.
 562  * This is similar to zfs_fuid_create_cred, except that
 563  * we can't find the domain + rid information in the
 564  * cred.  Instead we have to query Winchester for the
 565  * domain and rid.
 566  *
 567  * During replay operations the domain+rid information is
 568  * found in the zfs_fuid_info_t that the replay code has
 569  * attached to the zfsvfs of the file system.
 570  */
 571 uint64_t
 572 zfs_fuid_create(zfsvfs_t *zfsvfs, uint64_t id, cred_t *cr,
 573     zfs_fuid_type_t type, zfs_fuid_info_t **fuidpp)
 574 {
 575 #ifdef HAVE_KSID
 576         const char *domain, *kdomain;
 577         uint32_t fuid_idx = FUID_INDEX(id);
 578         uint32_t rid = 0;
 579         idmap_stat status;
 580         uint64_t idx = UID_NOBODY;
 581         zfs_fuid_t *zfuid = NULL;
 582         zfs_fuid_info_t *fuidp = NULL;
 583
 584         /*
 585          * If POSIX ID, or entry is already a FUID then
 586          * just return the id
 587          *
 588          * We may also be handed an already FUID'ized id via
 589          * chmod.
 590          */
 591
 592         if (!zfsvfs->z_use_fuids || !IS_EPHEMERAL(id) || fuid_idx != 0)
 593                 return (id);
 594
 595         if (zfsvfs->z_replay) {
 596                 fuidp = zfsvfs->z_fuid_replay;
 597
 598                 /*
 599                  * If we are passed an ephemeral id, but no
 600                  * fuid_info was logged then return NOBODY.
 601                  * This is most likely a result of idmap service
 602                  * not being available.
 603                  */
 604                 if (fuidp == NULL)
 605                         return (UID_NOBODY);
 606
 607                 VERIFY3U(type, >=, ZFS_OWNER);
 608                 VERIFY3U(type, <=, ZFS_ACE_GROUP);
 609
 610                 switch (type) {
 611                 case ZFS_ACE_USER:
 612                 case ZFS_ACE_GROUP:
 613                         zfuid = list_head(&fuidp->z_fuids);
 614                         rid = FUID_RID(zfuid->z_logfuid);
 615                         idx = FUID_INDEX(zfuid->z_logfuid);
 616                         break;
 617                 case ZFS_OWNER:
 618                         rid = FUID_RID(fuidp->z_fuid_owner);
 619                         idx = FUID_INDEX(fuidp->z_fuid_owner);
 620                         break;
 621                 case ZFS_GROUP:
 622                         rid = FUID_RID(fuidp->z_fuid_group);
 623                         idx = FUID_INDEX(fuidp->z_fuid_group);
 624                         break;
 625                 }
 626                 domain = fuidp->z_domain_table[idx - 1];
 627         } else {
 628                 if (type == ZFS_OWNER || type == ZFS_ACE_USER)
 629                         status = kidmap_getsidbyuid(crgetzone(cr), id,
 630                             &domain, &rid);
 631                 else
 632                         status = kidmap_getsidbygid(crgetzone(cr), id,
 633                             &domain, &rid);
 634
 635                 if (status != 0) {
 636                         /*
 637                          * When returning nobody we will need to
 638                          * make a dummy fuid table entry for logging
 639                          * purposes.
 640                          */
 641                         rid = UID_NOBODY;
 642                         domain = nulldomain;
 643                 }
 644         }
 645
 646         idx = zfs_fuid_find_by_domain(zfsvfs, domain, &kdomain, B_TRUE);
 647
 648         if (!zfsvfs->z_replay)
 649                 zfs_fuid_node_add(fuidpp, kdomain,
 650                     rid, idx, id, type);
 651         else if (zfuid != NULL) {
 652                 list_remove(&fuidp->z_fuids, zfuid);
 653                 kmem_free(zfuid, sizeof (zfs_fuid_t));
 654         }
 655         return (FUID_ENCODE(idx, rid));
 656 #else
 657         /*
 658          * The Linux port only supports POSIX IDs, use the passed id.
 659          */
 660         return (id);
 661 #endif
 662 }
 663
 664 void
 665 zfs_fuid_destroy(zfsvfs_t *zfsvfs)
 666 {
 667         rw_enter(&zfsvfs->z_fuid_lock, RW_WRITER);
 668         if (!zfsvfs->z_fuid_loaded) {
 669                 rw_exit(&zfsvfs->z_fuid_lock);
 670                 return;
 671         }
 672         zfs_fuid_table_destroy(&zfsvfs->z_fuid_idx, &zfsvfs->z_fuid_domain);
 673         rw_exit(&zfsvfs->z_fuid_lock);
 674 }
 675
 676 /*
 677  * Allocate zfs_fuid_info for tracking FUIDs created during
 678  * zfs_mknode, VOP_SETATTR() or VOP_SETSECATTR()
 679  */
 680 zfs_fuid_info_t *
 681 zfs_fuid_info_alloc(void)
 682 {
 683         zfs_fuid_info_t *fuidp;
 684
 685         fuidp = kmem_zalloc(sizeof (zfs_fuid_info_t), KM_SLEEP);
 686         list_create(&fuidp->z_domains, sizeof (zfs_fuid_domain_t),
 687             offsetof(zfs_fuid_domain_t, z_next));
 688         list_create(&fuidp->z_fuids, sizeof (zfs_fuid_t),
 689             offsetof(zfs_fuid_t, z_next));
 690         return (fuidp);
 691 }
 692
 693 /*
 694  * Release all memory associated with zfs_fuid_info_t
 695  */
 696 void
 697 zfs_fuid_info_free(zfs_fuid_info_t *fuidp)
 698 {
 699         zfs_fuid_t *zfuid;
 700         zfs_fuid_domain_t *zdomain;
 701
 702         while ((zfuid = list_remove_head(&fuidp->z_fuids)) != NULL)
 703                 kmem_free(zfuid, sizeof (zfs_fuid_t));
 704
 705         if (fuidp->z_domain_table != NULL)
 706                 kmem_free(fuidp->z_domain_table,
 707                     (sizeof (char *)) * fuidp->z_domain_cnt);
 708
 709         while ((zdomain = list_remove_head(&fuidp->z_domains)) != NULL)
 710                 kmem_free(zdomain, sizeof (zfs_fuid_domain_t));
 711
 712         kmem_free(fuidp, sizeof (zfs_fuid_info_t));
 713 }
 714
 715 /*
 716  * Check to see if id is a groupmember.  If cred
 717  * has ksid info then sidlist is checked first
 718  * and if still not found then POSIX groups are checked
 719  *
 720  * Will use a straight FUID compare when possible.
 721  */
 722 boolean_t
 723 zfs_groupmember(zfsvfs_t *zfsvfs, uint64_t id, cred_t *cr)
 724 {
 725         uid_t           gid;
 726
 727 #ifdef illumos
 728         ksid_t          *ksid = crgetsid(cr, KSID_GROUP);
 729         ksidlist_t      *ksidlist = crgetsidlist(cr);
 730
 731         if (ksid && ksidlist) {
 732                 int             i;
 733                 ksid_t          *ksid_groups;
 734                 uint32_t        idx = FUID_INDEX(id);
 735                 uint32_t        rid = FUID_RID(id);
 736
 737                 ksid_groups = ksidlist->ksl_sids;
 738
 739                 for (i = 0; i != ksidlist->ksl_nsid; i++) {
 740                         if (idx == 0) {
 741                                 if (id != IDMAP_WK_CREATOR_GROUP_GID &&
 742                                     id == ksid_groups[i].ks_id) {
 743                                         return (B_TRUE);
 744                                 }
 745                         } else {
 746                                 const char *domain;
 747
 748                                 domain = zfs_fuid_find_by_idx(zfsvfs, idx);
 749                                 ASSERT(domain != NULL);
 750
 751                                 if (strcmp(domain,
 752                                     IDMAP_WK_CREATOR_SID_AUTHORITY) == 0)
 753                                         return (B_FALSE);
 754
 755                                 if ((strcmp(domain,
 756                                     ksid_groups[i].ks_domain->kd_name) == 0) &&
 757                                     rid == ksid_groups[i].ks_rid)
 758                                         return (B_TRUE);
 759                         }
 760                 }
 761         }
 762 #endif /* illumos */
 763
 764         /*
 765          * Not found in ksidlist, check posix groups
 766          */
 767         gid = zfs_fuid_map_id(zfsvfs, id, cr, ZFS_GROUP);
 768         return (groupmember(gid, cr));
 769 }
 770
 771 void
 772 zfs_fuid_txhold(zfsvfs_t *zfsvfs, dmu_tx_t *tx)
 773 {
 774         if (zfsvfs->z_fuid_obj == 0) {
 775                 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT);
 776                 dmu_tx_hold_write(tx, DMU_NEW_OBJECT, 0,
 777                     FUID_SIZE_ESTIMATE(zfsvfs));
 778                 dmu_tx_hold_zap(tx, MASTER_NODE_OBJ, FALSE, NULL);
 779         } else {
 780                 dmu_tx_hold_bonus(tx, zfsvfs->z_fuid_obj);
 781                 dmu_tx_hold_write(tx, zfsvfs->z_fuid_obj, 0,
 782                     FUID_SIZE_ESTIMATE(zfsvfs));
 783         }
 784 }
 785
 786 /*
 787  * buf must be big enough (eg, 32 bytes)
 788  */
 789 int
 790 zfs_id_to_fuidstr(zfsvfs_t *zfsvfs, const char *domain, uid_t rid,
 791     char *buf, size_t len, boolean_t addok)
 792 {
 793         uint64_t fuid;
 794         int domainid = 0;
 795
 796         if (domain && domain[0]) {
 797                 domainid = zfs_fuid_find_by_domain(zfsvfs, domain, NULL, addok);
 798                 if (domainid == -1)
 799                         return (SET_ERROR(ENOENT));
 800         }
 801         fuid = FUID_ENCODE(domainid, rid);
 802         (void) snprintf(buf, len, "%llx", (longlong_t)fuid);
 803         return (0);
 804 }
 805 #endif