Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]
FreeBSD/Linux Kernel Cross Reference
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_dir.c
Version:
- FREEBSD - FREEBSD-13-STABLE - FREEBSD-13-0 - FREEBSD-12-STABLE - FREEBSD-12-0 - FREEBSD-11-STABLE - FREEBSD-11-0 - FREEBSD-10-STABLE - FREEBSD-10-0 - FREEBSD-9-STABLE - FREEBSD-9-0 - FREEBSD-8-STABLE - FREEBSD-8-0 - FREEBSD-7-STABLE - FREEBSD-7-0 - FREEBSD-6-STABLE - FREEBSD-6-0 - FREEBSD-5-STABLE - FREEBSD-5-0 - FREEBSD-4-STABLE - FREEBSD-3-STABLE - FREEBSD22 - l41 - OPENBSD - linux-2.6 - MK84 - PLAN9 - xnu-8792
SearchContext: - none - 3 - 10
SearchContext: - none - 3 - 10
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 /* 23 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 24 * Copyright (c) 2013, 2016 by Delphix. All rights reserved. 25 * Copyright 2017 Nexenta Systems, Inc. 26 */ 27 28 #include <sys/types.h> 29 #include <sys/param.h> 30 #include <sys/time.h> 31 #include <sys/systm.h> 32 #include <sys/sysmacros.h> 33 #include <sys/resource.h> 34 #include <sys/vfs.h> 35 #include <sys/vnode.h> 36 #include <sys/file.h> 37 #include <sys/kmem.h> 38 #include <sys/uio.h> 39 #include <sys/cmn_err.h> 40 #include <sys/errno.h> 41 #include <sys/stat.h> 42 #include <sys/unistd.h> 43 #include <sys/sunddi.h> 44 #include <sys/random.h> 45 #include <sys/policy.h> 46 #include <sys/kcondvar.h> 47 #include <sys/callb.h> 48 #include <sys/smp.h> 49 #include <sys/zfs_dir.h> 50 #include <sys/zfs_acl.h> 51 #include <sys/fs/zfs.h> 52 #include <sys/zap.h> 53 #include <sys/dmu.h> 54 #include <sys/atomic.h> 55 #include <sys/zfs_ctldir.h> 56 #include <sys/zfs_fuid.h> 57 #include <sys/sa.h> 58 #include <sys/zfs_sa.h> 59 #include <sys/dnlc.h> 60 #include <sys/extdirent.h> 61 62 /* 63 * zfs_match_find() is used by zfs_dirent_lookup() to peform zap lookups 64 * of names after deciding which is the appropriate lookup interface. 65 */ 66 static int 67 zfs_match_find(zfsvfs_t *zfsvfs, znode_t *dzp, const char *name, 68 matchtype_t mt, uint64_t *zoid) 69 { 70 int error; 71 72 if (zfsvfs->z_norm) { 73 74 /* 75 * In the non-mixed case we only expect there would ever 76 * be one match, but we need to use the normalizing lookup. 77 */ 78 error = zap_lookup_norm(zfsvfs->z_os, dzp->z_id, name, 8, 1, 79 zoid, mt, NULL, 0, NULL); 80 } else { 81 error = zap_lookup(zfsvfs->z_os, dzp->z_id, name, 8, 1, zoid); 82 } 83 *zoid = ZFS_DIRENT_OBJ(*zoid); 84 85 return (error); 86 } 87 88 /* 89 * Look up a directory entry under a locked vnode. 90 * dvp being locked gives us a guarantee that there are no concurrent 91 * modification of the directory and, thus, if a node can be found in 92 * the directory, then it must not be unlinked. 93 * 94 * Input arguments: 95 * dzp - znode for directory 96 * name - name of entry to lock 97 * flag - ZNEW: if the entry already exists, fail with EEXIST. 98 * ZEXISTS: if the entry does not exist, fail with ENOENT. 99 * ZXATTR: we want dzp's xattr directory 100 * 101 * Output arguments: 102 * zpp - pointer to the znode for the entry (NULL if there isn't one) 103 * 104 * Return value: 0 on success or errno on failure. 105 * 106 * NOTE: Always checks for, and rejects, '.' and '..'. 107 */ 108 int 109 zfs_dirent_lookup(znode_t *dzp, const char *name, znode_t **zpp, int flag) 110 { 111 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 112 matchtype_t mt = 0; 113 uint64_t zoid; 114 vnode_t *vp = NULL; 115 int error = 0; 116 117 ASSERT_VOP_LOCKED(ZTOV(dzp), __func__); 118 119 *zpp = NULL; 120 121 /* 122 * Verify that we are not trying to lock '.', '..', or '.zfs' 123 */ 124 if (name[0] == '.' && 125 (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')) || 126 zfs_has_ctldir(dzp) && strcmp(name, ZFS_CTLDIR_NAME) == 0) 127 return (SET_ERROR(EEXIST)); 128 129 /* 130 * Case sensitivity and normalization preferences are set when 131 * the file system is created. These are stored in the 132 * zfsvfs->z_case and zfsvfs->z_norm fields. These choices 133 * affect how we perform zap lookups. 134 * 135 * When matching we may need to normalize & change case according to 136 * FS settings. 137 * 138 * Note that a normalized match is necessary for a case insensitive 139 * filesystem when the lookup request is not exact because normalization 140 * can fold case independent of normalizing code point sequences. 141 * 142 * See the table above zfs_dropname(). 143 */ 144 if (zfsvfs->z_norm != 0) { 145 mt = MT_NORMALIZE; 146 147 /* 148 * Determine if the match needs to honor the case specified in 149 * lookup, and if so keep track of that so that during 150 * normalization we don't fold case. 151 */ 152 if (zfsvfs->z_case == ZFS_CASE_MIXED) { 153 mt |= MT_MATCH_CASE; 154 } 155 } 156 157 /* 158 * Only look in or update the DNLC if we are looking for the 159 * name on a file system that does not require normalization 160 * or case folding. We can also look there if we happen to be 161 * on a non-normalizing, mixed sensitivity file system IF we 162 * are looking for the exact name. 163 * 164 * NB: we do not need to worry about this flag for ZFS_CASE_SENSITIVE 165 * because in that case MT_EXACT and MT_FIRST should produce exactly 166 * the same result. 167 */ 168 169 if (dzp->z_unlinked && !(flag & ZXATTR)) 170 return (ENOENT); 171 if (flag & ZXATTR) { 172 error = sa_lookup(dzp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &zoid, 173 sizeof (zoid)); 174 if (error == 0) 175 error = (zoid == 0 ? ENOENT : 0); 176 } else { 177 error = zfs_match_find(zfsvfs, dzp, name, mt, &zoid); 178 } 179 if (error) { 180 if (error != ENOENT || (flag & ZEXISTS)) { 181 return (error); 182 } 183 } else { 184 if (flag & ZNEW) { 185 return (SET_ERROR(EEXIST)); 186 } 187 error = zfs_zget(zfsvfs, zoid, zpp); 188 if (error) 189 return (error); 190 ASSERT(!(*zpp)->z_unlinked); 191 } 192 193 return (0); 194 } 195 196 static int 197 zfs_dd_lookup(znode_t *dzp, znode_t **zpp) 198 { 199 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 200 znode_t *zp; 201 uint64_t parent; 202 int error; 203 204 ASSERT_VOP_LOCKED(ZTOV(dzp), __func__); 205 ASSERT(RRM_READ_HELD(&zfsvfs->z_teardown_lock)); 206 207 if (dzp->z_unlinked) 208 return (ENOENT); 209 210 if ((error = sa_lookup(dzp->z_sa_hdl, 211 SA_ZPL_PARENT(zfsvfs), &parent, sizeof (parent))) != 0) 212 return (error); 213 214 error = zfs_zget(zfsvfs, parent, &zp); 215 if (error == 0) 216 *zpp = zp; 217 return (error); 218 } 219 220 int 221 zfs_dirlook(znode_t *dzp, const char *name, znode_t **zpp) 222 { 223 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 224 znode_t *zp; 225 int error = 0; 226 227 ASSERT_VOP_LOCKED(ZTOV(dzp), __func__); 228 ASSERT(RRM_READ_HELD(&zfsvfs->z_teardown_lock)); 229 230 if (dzp->z_unlinked) 231 return (SET_ERROR(ENOENT)); 232 233 if (name[0] == 0 || (name[0] == '.' && name[1] == 0)) { 234 *zpp = dzp; 235 } else if (name[0] == '.' && name[1] == '.' && name[2] == 0) { 236 error = zfs_dd_lookup(dzp, zpp); 237 } else { 238 error = zfs_dirent_lookup(dzp, name, &zp, ZEXISTS); 239 if (error == 0) { 240 dzp->z_zn_prefetch = B_TRUE; /* enable prefetching */ 241 *zpp = zp; 242 } 243 } 244 return (error); 245 } 246 247 /* 248 * unlinked Set (formerly known as the "delete queue") Error Handling 249 * 250 * When dealing with the unlinked set, we dmu_tx_hold_zap(), but we 251 * don't specify the name of the entry that we will be manipulating. We 252 * also fib and say that we won't be adding any new entries to the 253 * unlinked set, even though we might (this is to lower the minimum file 254 * size that can be deleted in a full filesystem). So on the small 255 * chance that the nlink list is using a fat zap (ie. has more than 256 * 2000 entries), we *may* not pre-read a block that's needed. 257 * Therefore it is remotely possible for some of the assertions 258 * regarding the unlinked set below to fail due to i/o error. On a 259 * nondebug system, this will result in the space being leaked. 260 */ 261 void 262 zfs_unlinked_add(znode_t *zp, dmu_tx_t *tx) 263 { 264 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 265 266 ASSERT(zp->z_unlinked); 267 ASSERT(zp->z_links == 0); 268 269 VERIFY3U(0, ==, 270 zap_add_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); 271 } 272 273 /* 274 * Clean up any znodes that had no links when we either crashed or 275 * (force) umounted the file system. 276 */ 277 void 278 zfs_unlinked_drain(zfsvfs_t *zfsvfs) 279 { 280 zap_cursor_t zc; 281 zap_attribute_t zap; 282 dmu_object_info_t doi; 283 znode_t *zp; 284 int error; 285 286 /* 287 * Interate over the contents of the unlinked set. 288 */ 289 for (zap_cursor_init(&zc, zfsvfs->z_os, zfsvfs->z_unlinkedobj); 290 zap_cursor_retrieve(&zc, &zap) == 0; 291 zap_cursor_advance(&zc)) { 292 293 /* 294 * See what kind of object we have in list 295 */ 296 297 error = dmu_object_info(zfsvfs->z_os, 298 zap.za_first_integer, &doi); 299 if (error != 0) 300 continue; 301 302 ASSERT((doi.doi_type == DMU_OT_PLAIN_FILE_CONTENTS) || 303 (doi.doi_type == DMU_OT_DIRECTORY_CONTENTS)); 304 /* 305 * We need to re-mark these list entries for deletion, 306 * so we pull them back into core and set zp->z_unlinked. 307 */ 308 error = zfs_zget(zfsvfs, zap.za_first_integer, &zp); 309 310 /* 311 * We may pick up znodes that are already marked for deletion. 312 * This could happen during the purge of an extended attribute 313 * directory. All we need to do is skip over them, since they 314 * are already in the system marked z_unlinked. 315 */ 316 if (error != 0) 317 continue; 318 319 vn_lock(ZTOV(zp), LK_EXCLUSIVE | LK_RETRY); 320 zp->z_unlinked = B_TRUE; 321 vput(ZTOV(zp)); 322 } 323 zap_cursor_fini(&zc); 324 } 325 326 /* 327 * Delete the entire contents of a directory. Return a count 328 * of the number of entries that could not be deleted. If we encounter 329 * an error, return a count of at least one so that the directory stays 330 * in the unlinked set. 331 * 332 * NOTE: this function assumes that the directory is inactive, 333 * so there is no need to lock its entries before deletion. 334 * Also, it assumes the directory contents is *only* regular 335 * files. 336 */ 337 static int 338 zfs_purgedir(znode_t *dzp) 339 { 340 zap_cursor_t zc; 341 zap_attribute_t zap; 342 znode_t *xzp; 343 dmu_tx_t *tx; 344 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 345 int skipped = 0; 346 int error; 347 348 for (zap_cursor_init(&zc, zfsvfs->z_os, dzp->z_id); 349 (error = zap_cursor_retrieve(&zc, &zap)) == 0; 350 zap_cursor_advance(&zc)) { 351 error = zfs_zget(zfsvfs, 352 ZFS_DIRENT_OBJ(zap.za_first_integer), &xzp); 353 if (error) { 354 skipped += 1; 355 continue; 356 } 357 358 vn_lock(ZTOV(xzp), LK_EXCLUSIVE | LK_RETRY); 359 ASSERT((ZTOV(xzp)->v_type == VREG) || 360 (ZTOV(xzp)->v_type == VLNK)); 361 362 tx = dmu_tx_create(zfsvfs->z_os); 363 dmu_tx_hold_sa(tx, dzp->z_sa_hdl, B_FALSE); 364 dmu_tx_hold_zap(tx, dzp->z_id, FALSE, zap.za_name); 365 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); 366 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 367 /* Is this really needed ? */ 368 zfs_sa_upgrade_txholds(tx, xzp); 369 dmu_tx_mark_netfree(tx); 370 error = dmu_tx_assign(tx, TXG_WAIT); 371 if (error) { 372 dmu_tx_abort(tx); 373 vput(ZTOV(xzp)); 374 skipped += 1; 375 continue; 376 } 377 378 error = zfs_link_destroy(dzp, zap.za_name, xzp, tx, 0, NULL); 379 if (error) 380 skipped += 1; 381 dmu_tx_commit(tx); 382 383 vput(ZTOV(xzp)); 384 } 385 zap_cursor_fini(&zc); 386 if (error != ENOENT) 387 skipped += 1; 388 return (skipped); 389 } 390 391 void 392 zfs_rmnode(znode_t *zp) 393 { 394 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 395 objset_t *os = zfsvfs->z_os; 396 znode_t *xzp = NULL; 397 dmu_tx_t *tx; 398 uint64_t acl_obj; 399 uint64_t xattr_obj; 400 int error; 401 402 ASSERT(zp->z_links == 0); 403 ASSERT_VOP_ELOCKED(ZTOV(zp), __func__); 404 405 /* 406 * If this is an attribute directory, purge its contents. 407 */ 408 if (ZTOV(zp) != NULL && ZTOV(zp)->v_type == VDIR && 409 (zp->z_pflags & ZFS_XATTR)) { 410 if (zfs_purgedir(zp) != 0) { 411 /* 412 * Not enough space to delete some xattrs. 413 * Leave it in the unlinked set. 414 */ 415 zfs_znode_dmu_fini(zp); 416 zfs_znode_free(zp); 417 return; 418 } 419 } else { 420 /* 421 * Free up all the data in the file. We don't do this for 422 * XATTR directories because we need truncate and remove to be 423 * in the same tx, like in zfs_znode_delete(). Otherwise, if 424 * we crash here we'll end up with an inconsistent truncated 425 * zap object in the delete queue. Note a truncated file is 426 * harmless since it only contains user data. 427 */ 428 error = dmu_free_long_range(os, zp->z_id, 0, DMU_OBJECT_END); 429 if (error) { 430 /* 431 * Not enough space or we were interrupted by unmount. 432 * Leave the file in the unlinked set. 433 */ 434 zfs_znode_dmu_fini(zp); 435 zfs_znode_free(zp); 436 return; 437 } 438 } 439 440 /* 441 * If the file has extended attributes, we're going to unlink 442 * the xattr dir. 443 */ 444 error = sa_lookup(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), 445 &xattr_obj, sizeof (xattr_obj)); 446 if (error == 0 && xattr_obj) { 447 error = zfs_zget(zfsvfs, xattr_obj, &xzp); 448 ASSERT3S(error, ==, 0); 449 vn_lock(ZTOV(xzp), LK_EXCLUSIVE | LK_RETRY); 450 } 451 452 acl_obj = zfs_external_acl(zp); 453 454 /* 455 * Set up the final transaction. 456 */ 457 tx = dmu_tx_create(os); 458 dmu_tx_hold_free(tx, zp->z_id, 0, DMU_OBJECT_END); 459 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, FALSE, NULL); 460 if (xzp) { 461 dmu_tx_hold_zap(tx, zfsvfs->z_unlinkedobj, TRUE, NULL); 462 dmu_tx_hold_sa(tx, xzp->z_sa_hdl, B_FALSE); 463 } 464 if (acl_obj) 465 dmu_tx_hold_free(tx, acl_obj, 0, DMU_OBJECT_END); 466 467 zfs_sa_upgrade_txholds(tx, zp); 468 error = dmu_tx_assign(tx, TXG_WAIT); 469 if (error) { 470 /* 471 * Not enough space to delete the file. Leave it in the 472 * unlinked set, leaking it until the fs is remounted (at 473 * which point we'll call zfs_unlinked_drain() to process it). 474 */ 475 dmu_tx_abort(tx); 476 zfs_znode_dmu_fini(zp); 477 zfs_znode_free(zp); 478 goto out; 479 } 480 481 if (xzp) { 482 ASSERT(error == 0); 483 xzp->z_unlinked = B_TRUE; /* mark xzp for deletion */ 484 xzp->z_links = 0; /* no more links to it */ 485 VERIFY(0 == sa_update(xzp->z_sa_hdl, SA_ZPL_LINKS(zfsvfs), 486 &xzp->z_links, sizeof (xzp->z_links), tx)); 487 zfs_unlinked_add(xzp, tx); 488 } 489 490 /* Remove this znode from the unlinked set */ 491 VERIFY3U(0, ==, 492 zap_remove_int(zfsvfs->z_os, zfsvfs->z_unlinkedobj, zp->z_id, tx)); 493 494 zfs_znode_delete(zp, tx); 495 496 dmu_tx_commit(tx); 497 out: 498 if (xzp) 499 vput(ZTOV(xzp)); 500 } 501 502 static uint64_t 503 zfs_dirent(znode_t *zp, uint64_t mode) 504 { 505 uint64_t de = zp->z_id; 506 507 if (zp->z_zfsvfs->z_version >= ZPL_VERSION_DIRENT_TYPE) 508 de |= IFTODT(mode) << 60; 509 return (de); 510 } 511 512 /* 513 * Link zp into dzp. Can only fail if zp has been unlinked. 514 */ 515 int 516 zfs_link_create(znode_t *dzp, const char *name, znode_t *zp, dmu_tx_t *tx, 517 int flag) 518 { 519 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 520 vnode_t *vp = ZTOV(zp); 521 uint64_t value; 522 int zp_is_dir = (vp->v_type == VDIR); 523 sa_bulk_attr_t bulk[5]; 524 uint64_t mtime[2], ctime[2]; 525 int count = 0; 526 int error; 527 528 ASSERT_VOP_ELOCKED(ZTOV(dzp), __func__); 529 ASSERT_VOP_ELOCKED(ZTOV(zp), __func__); 530 #if 0 531 if (zp_is_dir) { 532 error = 0; 533 if (dzp->z_links >= LINK_MAX) 534 error = SET_ERROR(EMLINK); 535 return (error); 536 } 537 #endif 538 if (!(flag & ZRENAMING)) { 539 if (zp->z_unlinked) { /* no new links to unlinked zp */ 540 ASSERT(!(flag & (ZNEW | ZEXISTS))); 541 return (SET_ERROR(ENOENT)); 542 } 543 #if 0 544 if (zp->z_links >= LINK_MAX) { 545 return (SET_ERROR(EMLINK)); 546 } 547 #endif 548 zp->z_links++; 549 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 550 &zp->z_links, sizeof (zp->z_links)); 551 552 } else { 553 ASSERT(zp->z_unlinked == 0); 554 } 555 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, 556 &dzp->z_id, sizeof (dzp->z_id)); 557 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 558 &zp->z_pflags, sizeof (zp->z_pflags)); 559 560 if (!(flag & ZNEW)) { 561 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 562 ctime, sizeof (ctime)); 563 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, 564 ctime, B_TRUE); 565 } 566 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 567 ASSERT0(error); 568 569 dzp->z_size++; 570 dzp->z_links += zp_is_dir; 571 count = 0; 572 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 573 &dzp->z_size, sizeof (dzp->z_size)); 574 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 575 &dzp->z_links, sizeof (dzp->z_links)); 576 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, 577 mtime, sizeof (mtime)); 578 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, 579 ctime, sizeof (ctime)); 580 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 581 &dzp->z_pflags, sizeof (dzp->z_pflags)); 582 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); 583 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); 584 ASSERT0(error); 585 586 value = zfs_dirent(zp, zp->z_mode); 587 error = zap_add(zp->z_zfsvfs->z_os, dzp->z_id, name, 588 8, 1, &value, tx); 589 VERIFY0(error); 590 591 return (0); 592 } 593 594 /* 595 * The match type in the code for this function should conform to: 596 * 597 * ------------------------------------------------------------------------ 598 * fs type | z_norm | lookup type | match type 599 * ---------|-------------|-------------|---------------------------------- 600 * CS !norm | 0 | 0 | 0 (exact) 601 * CS norm | formX | 0 | MT_NORMALIZE 602 * CI !norm | upper | !ZCIEXACT | MT_NORMALIZE 603 * CI !norm | upper | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE 604 * CI norm | upper|formX | !ZCIEXACT | MT_NORMALIZE 605 * CI norm | upper|formX | ZCIEXACT | MT_NORMALIZE | MT_MATCH_CASE 606 * CM !norm | upper | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE 607 * CM !norm | upper | ZCILOOK | MT_NORMALIZE 608 * CM norm | upper|formX | !ZCILOOK | MT_NORMALIZE | MT_MATCH_CASE 609 * CM norm | upper|formX | ZCILOOK | MT_NORMALIZE 610 * 611 * Abbreviations: 612 * CS = Case Sensitive, CI = Case Insensitive, CM = Case Mixed 613 * upper = case folding set by fs type on creation (U8_TEXTPREP_TOUPPER) 614 * formX = unicode normalization form set on fs creation 615 */ 616 static int 617 zfs_dropname(znode_t *dzp, const char *name, znode_t *zp, dmu_tx_t *tx, 618 int flag) 619 { 620 int error; 621 622 if (zp->z_zfsvfs->z_norm) { 623 matchtype_t mt = MT_NORMALIZE; 624 625 if (zp->z_zfsvfs->z_case == ZFS_CASE_MIXED) { 626 mt |= MT_MATCH_CASE; 627 } 628 629 error = zap_remove_norm(zp->z_zfsvfs->z_os, dzp->z_id, 630 name, mt, tx); 631 } else { 632 error = zap_remove(zp->z_zfsvfs->z_os, dzp->z_id, name, tx); 633 } 634 635 return (error); 636 } 637 638 /* 639 * Unlink zp from dzp, and mark zp for deletion if this was the last link. 640 * Can fail if zp is a mount point (EBUSY) or a non-empty directory (EEXIST). 641 * If 'unlinkedp' is NULL, we put unlinked znodes on the unlinked list. 642 * If it's non-NULL, we use it to indicate whether the znode needs deletion, 643 * and it's the caller's job to do it. 644 */ 645 int 646 zfs_link_destroy(znode_t *dzp, const char *name, znode_t *zp, dmu_tx_t *tx, 647 int flag, boolean_t *unlinkedp) 648 { 649 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 650 vnode_t *vp = ZTOV(zp); 651 int zp_is_dir = (vp->v_type == VDIR); 652 boolean_t unlinked = B_FALSE; 653 sa_bulk_attr_t bulk[5]; 654 uint64_t mtime[2], ctime[2]; 655 int count = 0; 656 int error; 657 658 ASSERT_VOP_ELOCKED(ZTOV(dzp), __func__); 659 ASSERT_VOP_ELOCKED(ZTOV(zp), __func__); 660 661 if (!(flag & ZRENAMING)) { 662 663 if (zp_is_dir && !zfs_dirempty(zp)) { 664 #ifdef illumos 665 return (SET_ERROR(EEXIST)); 666 #else 667 return (SET_ERROR(ENOTEMPTY)); 668 #endif 669 } 670 671 /* 672 * If we get here, we are going to try to remove the object. 673 * First try removing the name from the directory; if that 674 * fails, return the error. 675 */ 676 error = zfs_dropname(dzp, name, zp, tx, flag); 677 if (error != 0) { 678 return (error); 679 } 680 681 if (zp->z_links <= zp_is_dir) { 682 zfs_panic_recover("zfs: link count on vnode %p is %u, " 683 "should be at least %u", zp->z_vnode, 684 (int)zp->z_links, 685 zp_is_dir + 1); 686 zp->z_links = zp_is_dir + 1; 687 } 688 if (--zp->z_links == zp_is_dir) { 689 zp->z_unlinked = B_TRUE; 690 zp->z_links = 0; 691 unlinked = B_TRUE; 692 } else { 693 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), 694 NULL, &ctime, sizeof (ctime)); 695 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 696 NULL, &zp->z_pflags, sizeof (zp->z_pflags)); 697 zfs_tstamp_update_setup(zp, STATE_CHANGED, mtime, ctime, 698 B_TRUE); 699 } 700 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), 701 NULL, &zp->z_links, sizeof (zp->z_links)); 702 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 703 count = 0; 704 ASSERT0(error); 705 } else { 706 ASSERT(zp->z_unlinked == 0); 707 error = zfs_dropname(dzp, name, zp, tx, flag); 708 if (error != 0) 709 return (error); 710 } 711 712 dzp->z_size--; /* one dirent removed */ 713 dzp->z_links -= zp_is_dir; /* ".." link from zp */ 714 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), 715 NULL, &dzp->z_links, sizeof (dzp->z_links)); 716 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), 717 NULL, &dzp->z_size, sizeof (dzp->z_size)); 718 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), 719 NULL, ctime, sizeof (ctime)); 720 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), 721 NULL, mtime, sizeof (mtime)); 722 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 723 NULL, &dzp->z_pflags, sizeof (dzp->z_pflags)); 724 zfs_tstamp_update_setup(dzp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); 725 error = sa_bulk_update(dzp->z_sa_hdl, bulk, count, tx); 726 ASSERT0(error); 727 728 if (unlinkedp != NULL) 729 *unlinkedp = unlinked; 730 else if (unlinked) 731 zfs_unlinked_add(zp, tx); 732 733 return (0); 734 } 735 736 /* 737 * Indicate whether the directory is empty. 738 */ 739 boolean_t 740 zfs_dirempty(znode_t *dzp) 741 { 742 return (dzp->z_size == 2); 743 } 744 745 int 746 zfs_make_xattrdir(znode_t *zp, vattr_t *vap, vnode_t **xvpp, cred_t *cr) 747 { 748 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 749 znode_t *xzp; 750 dmu_tx_t *tx; 751 int error; 752 zfs_acl_ids_t acl_ids; 753 boolean_t fuid_dirtied; 754 uint64_t parent; 755 756 *xvpp = NULL; 757 758 /* 759 * In FreeBSD, access checking for creating an EA is being done 760 * in zfs_setextattr(), 761 */ 762 #ifndef __FreeBSD_kernel__ 763 if (error = zfs_zaccess(zp, ACE_WRITE_NAMED_ATTRS, 0, B_FALSE, cr)) 764 return (error); 765 #endif 766 767 if ((error = zfs_acl_ids_create(zp, IS_XATTR, vap, cr, NULL, 768 &acl_ids)) != 0) 769 return (error); 770 if (zfs_acl_ids_overquota(zfsvfs, &acl_ids)) { 771 zfs_acl_ids_free(&acl_ids); 772 return (SET_ERROR(EDQUOT)); 773 } 774 775 getnewvnode_reserve(1); 776 777 tx = dmu_tx_create(zfsvfs->z_os); 778 dmu_tx_hold_sa_create(tx, acl_ids.z_aclp->z_acl_bytes + 779 ZFS_SA_BASE_ATTR_SIZE); 780 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_TRUE); 781 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, FALSE, NULL); 782 fuid_dirtied = zfsvfs->z_fuid_dirty; 783 if (fuid_dirtied) 784 zfs_fuid_txhold(zfsvfs, tx); 785 error = dmu_tx_assign(tx, TXG_WAIT); 786 if (error) { 787 zfs_acl_ids_free(&acl_ids); 788 dmu_tx_abort(tx); 789 return (error); 790 } 791 zfs_mknode(zp, vap, tx, cr, IS_XATTR, &xzp, &acl_ids); 792 793 if (fuid_dirtied) 794 zfs_fuid_sync(zfsvfs, tx); 795 796 #ifdef DEBUG 797 error = sa_lookup(xzp->z_sa_hdl, SA_ZPL_PARENT(zfsvfs), 798 &parent, sizeof (parent)); 799 ASSERT(error == 0 && parent == zp->z_id); 800 #endif 801 802 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_XATTR(zfsvfs), &xzp->z_id, 803 sizeof (xzp->z_id), tx)); 804 805 (void) zfs_log_create(zfsvfs->z_log, tx, TX_MKXATTR, zp, 806 xzp, "", NULL, acl_ids.z_fuidp, vap); 807 808 zfs_acl_ids_free(&acl_ids); 809 dmu_tx_commit(tx); 810 811 getnewvnode_drop_reserve(); 812 813 *xvpp = ZTOV(xzp); 814 815 return (0); 816 } 817 818 /* 819 * Return a znode for the extended attribute directory for zp. 820 * ** If the directory does not already exist, it is created ** 821 * 822 * IN: zp - znode to obtain attribute directory from 823 * cr - credentials of caller 824 * flags - flags from the VOP_LOOKUP call 825 * 826 * OUT: xzpp - pointer to extended attribute znode 827 * 828 * RETURN: 0 on success 829 * error number on failure 830 */ 831 int 832 zfs_get_xattrdir(znode_t *zp, vnode_t **xvpp, cred_t *cr, int flags) 833 { 834 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 835 znode_t *xzp; 836 vattr_t va; 837 int error; 838 top: 839 error = zfs_dirent_lookup(zp, "", &xzp, ZXATTR); 840 if (error) 841 return (error); 842 843 if (xzp != NULL) { 844 *xvpp = ZTOV(xzp); 845 return (0); 846 } 847 848 849 if (!(flags & CREATE_XATTR_DIR)) { 850 #ifdef illumos 851 return (SET_ERROR(ENOENT)); 852 #else 853 return (SET_ERROR(ENOATTR)); 854 #endif 855 } 856 857 if (zfsvfs->z_vfs->vfs_flag & VFS_RDONLY) { 858 return (SET_ERROR(EROFS)); 859 } 860 861 /* 862 * The ability to 'create' files in an attribute 863 * directory comes from the write_xattr permission on the base file. 864 * 865 * The ability to 'search' an attribute directory requires 866 * read_xattr permission on the base file. 867 * 868 * Once in a directory the ability to read/write attributes 869 * is controlled by the permissions on the attribute file. 870 */ 871 va.va_mask = AT_TYPE | AT_MODE | AT_UID | AT_GID; 872 va.va_type = VDIR; 873 va.va_mode = S_IFDIR | S_ISVTX | 0777; 874 zfs_fuid_map_ids(zp, cr, &va.va_uid, &va.va_gid); 875 876 error = zfs_make_xattrdir(zp, &va, xvpp, cr); 877 878 if (error == ERESTART) { 879 /* NB: we already did dmu_tx_wait() if necessary */ 880 goto top; 881 } 882 if (error == 0) 883 VOP_UNLOCK(*xvpp, 0); 884 885 return (error); 886 } 887 888 /* 889 * Decide whether it is okay to remove within a sticky directory. 890 * 891 * In sticky directories, write access is not sufficient; 892 * you can remove entries from a directory only if: 893 * 894 * you own the directory, 895 * you own the entry, 896 * the entry is a plain file and you have write access, 897 * or you are privileged (checked in secpolicy...). 898 * 899 * The function returns 0 if remove access is granted. 900 */ 901 int 902 zfs_sticky_remove_access(znode_t *zdp, znode_t *zp, cred_t *cr) 903 { 904 uid_t uid; 905 uid_t downer; 906 uid_t fowner; 907 zfsvfs_t *zfsvfs = zdp->z_zfsvfs; 908 909 if (zdp->z_zfsvfs->z_replay) 910 return (0); 911 912 if ((zdp->z_mode & S_ISVTX) == 0) 913 return (0); 914 915 downer = zfs_fuid_map_id(zfsvfs, zdp->z_uid, cr, ZFS_OWNER); 916 fowner = zfs_fuid_map_id(zfsvfs, zp->z_uid, cr, ZFS_OWNER); 917 918 if ((uid = crgetuid(cr)) == downer || uid == fowner || 919 (ZTOV(zp)->v_type == VREG && 920 zfs_zaccess(zp, ACE_WRITE_DATA, 0, B_FALSE, cr) == 0)) 921 return (0); 922 else 923 return (secpolicy_vnode_remove(ZTOV(zp), cr)); 924 }
Cache object: 31eb642df953b16aca817b45b20a7d5b
[ source navigation ] [ diff markup ] [ identifier search ] [ freetext search ] [ file search ] [ list types ] [ track identifier ]