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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012, 2014 by Delphix. All rights reserved. 24 * Copyright (c) 2014 Integros [integros.com] 25 */ 26 27 /* Portions Copyright 2007 Jeremy Teo */ 28 /* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */ 29 30 #ifdef _KERNEL 31 #include <sys/types.h> 32 #include <sys/param.h> 33 #include <sys/time.h> 34 #include <sys/systm.h> 35 #include <sys/sysmacros.h> 36 #include <sys/resource.h> 37 #include <sys/mntent.h> 38 #include <sys/u8_textprep.h> 39 #include <sys/dsl_dataset.h> 40 #include <sys/vfs.h> 41 #include <sys/vnode.h> 42 #include <sys/file.h> 43 #include <sys/kmem.h> 44 #include <sys/errno.h> 45 #include <sys/unistd.h> 46 #include <sys/atomic.h> 47 #include <sys/zfs_dir.h> 48 #include <sys/zfs_acl.h> 49 #include <sys/zfs_ioctl.h> 50 #include <sys/zfs_rlock.h> 51 #include <sys/zfs_fuid.h> 52 #include <sys/dnode.h> 53 #include <sys/fs/zfs.h> 54 #include <sys/kidmap.h> 55 56 #ifdef __NetBSD__ 57 #include <miscfs/specfs/specdev.h> 58 59 extern int (**zfs_vnodeop_p)(void *); 60 extern int (**zfs_fifoop_p)(void *); 61 extern int (**zfs_specop_p)(void *); 62 63 struct zfs_loadvnode_args { 64 dmu_buf_t *db; 65 int blksz; 66 dmu_object_type_t obj_type; 67 void *sa_hdl; 68 }; 69 70 uint_t zfs_loadvnode_key; 71 72 #endif 73 #endif /* _KERNEL */ 74 75 #include <sys/dmu.h> 76 #include <sys/dmu_objset.h> 77 #include <sys/refcount.h> 78 #include <sys/stat.h> 79 #include <sys/zap.h> 80 #include <sys/zfs_znode.h> 81 #include <sys/sa.h> 82 #include <sys/zfs_sa.h> 83 #include <sys/zfs_stat.h> 84 #include <sys/refcount.h> 85 86 #include "zfs_prop.h" 87 #include "zfs_comutil.h" 88 89 /* Used by fstat(1). */ 90 SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD, 91 SYSCTL_NULL_INT_PTR, sizeof(znode_t), "sizeof(znode_t)"); 92 93 /* 94 * Define ZNODE_STATS to turn on statistic gathering. By default, it is only 95 * turned on when DEBUG is also defined. 96 */ 97 #ifdef DEBUG 98 #define ZNODE_STATS 99 #endif /* DEBUG */ 100 101 #ifdef ZNODE_STATS 102 #define ZNODE_STAT_ADD(stat) ((stat)++) 103 #else 104 #define ZNODE_STAT_ADD(stat) /* nothing */ 105 #endif /* ZNODE_STATS */ 106 107 /* 108 * Functions needed for userland (ie: libzpool) are not put under 109 * #ifdef_KERNEL; the rest of the functions have dependencies 110 * (such as VFS logic) that will not compile easily in userland. 111 */ 112 #ifdef _KERNEL 113 /* 114 * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to 115 * be freed before it can be safely accessed. 116 */ 117 krwlock_t zfsvfs_lock; 118 119 static kmem_cache_t *znode_cache = NULL; 120 121 /*ARGSUSED*/ 122 static void 123 znode_evict_error(dmu_buf_t *dbuf, void *user_ptr) 124 { 125 /* 126 * We should never drop all dbuf refs without first clearing 127 * the eviction callback. 128 */ 129 panic("evicting znode %p\n", user_ptr); 130 } 131 132 extern struct vop_vector zfs_vnodeops; 133 extern struct vop_vector zfs_fifoops; 134 extern struct vop_vector zfs_shareops; 135 136 static int 137 zfs_znode_cache_constructor(void *buf, void *arg, int kmflags) 138 { 139 znode_t *zp = buf; 140 141 #ifdef __NetBSD__ 142 zp = arg; 143 #endif 144 POINTER_INVALIDATE(&zp->z_zfsvfs); 145 146 list_link_init(&zp->z_link_node); 147 148 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL); 149 150 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL); 151 avl_create(&zp->z_range_avl, zfs_range_compare, 152 sizeof (rl_t), offsetof(rl_t, r_node)); 153 154 zp->z_acl_cached = NULL; 155 zp->z_vnode = NULL; 156 zp->z_moved = 0; 157 return (0); 158 } 159 160 /*ARGSUSED*/ 161 static void 162 zfs_znode_cache_destructor(void *buf, void *arg) 163 { 164 znode_t *zp = buf; 165 166 #ifdef __NetBSD__ 167 zp = arg; 168 #endif 169 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 170 ASSERT(ZTOV(zp) == NULL); 171 #ifndef __NetBSD__ 172 vn_free(ZTOV(zp)); 173 #endif 174 ASSERT(!list_link_active(&zp->z_link_node)); 175 mutex_destroy(&zp->z_acl_lock); 176 avl_destroy(&zp->z_range_avl); 177 mutex_destroy(&zp->z_range_lock); 178 179 ASSERT(zp->z_acl_cached == NULL); 180 } 181 182 #ifdef ZNODE_STATS 183 static struct { 184 uint64_t zms_zfsvfs_invalid; 185 uint64_t zms_zfsvfs_recheck1; 186 uint64_t zms_zfsvfs_unmounted; 187 uint64_t zms_zfsvfs_recheck2; 188 uint64_t zms_obj_held; 189 uint64_t zms_vnode_locked; 190 uint64_t zms_not_only_dnlc; 191 } znode_move_stats; 192 #endif /* ZNODE_STATS */ 193 194 #ifdef illumos 195 static void 196 zfs_znode_move_impl(znode_t *ozp, znode_t *nzp) 197 { 198 vnode_t *vp; 199 200 /* Copy fields. */ 201 nzp->z_zfsvfs = ozp->z_zfsvfs; 202 203 /* Swap vnodes. */ 204 vp = nzp->z_vnode; 205 nzp->z_vnode = ozp->z_vnode; 206 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */ 207 ZTOV(ozp)->v_data = ozp; 208 ZTOV(nzp)->v_data = nzp; 209 210 nzp->z_id = ozp->z_id; 211 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */ 212 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0); 213 nzp->z_unlinked = ozp->z_unlinked; 214 nzp->z_atime_dirty = ozp->z_atime_dirty; 215 nzp->z_zn_prefetch = ozp->z_zn_prefetch; 216 nzp->z_blksz = ozp->z_blksz; 217 nzp->z_seq = ozp->z_seq; 218 nzp->z_mapcnt = ozp->z_mapcnt; 219 nzp->z_gen = ozp->z_gen; 220 nzp->z_sync_cnt = ozp->z_sync_cnt; 221 nzp->z_is_sa = ozp->z_is_sa; 222 nzp->z_sa_hdl = ozp->z_sa_hdl; 223 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2); 224 nzp->z_links = ozp->z_links; 225 nzp->z_size = ozp->z_size; 226 nzp->z_pflags = ozp->z_pflags; 227 nzp->z_uid = ozp->z_uid; 228 nzp->z_gid = ozp->z_gid; 229 nzp->z_mode = ozp->z_mode; 230 231 /* 232 * Since this is just an idle znode and kmem is already dealing with 233 * memory pressure, release any cached ACL. 234 */ 235 if (ozp->z_acl_cached) { 236 zfs_acl_free(ozp->z_acl_cached); 237 ozp->z_acl_cached = NULL; 238 } 239 240 sa_set_userp(nzp->z_sa_hdl, nzp); 241 242 /* 243 * Invalidate the original znode by clearing fields that provide a 244 * pointer back to the znode. Set the low bit of the vfs pointer to 245 * ensure that zfs_znode_move() recognizes the znode as invalid in any 246 * subsequent callback. 247 */ 248 ozp->z_sa_hdl = NULL; 249 POINTER_INVALIDATE(&ozp->z_zfsvfs); 250 251 /* 252 * Mark the znode. 253 */ 254 nzp->z_moved = 1; 255 ozp->z_moved = (uint8_t)-1; 256 } 257 258 /*ARGSUSED*/ 259 static kmem_cbrc_t 260 zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg) 261 { 262 znode_t *ozp = buf, *nzp = newbuf; 263 zfsvfs_t *zfsvfs; 264 vnode_t *vp; 265 266 /* 267 * The znode is on the file system's list of known znodes if the vfs 268 * pointer is valid. We set the low bit of the vfs pointer when freeing 269 * the znode to invalidate it, and the memory patterns written by kmem 270 * (baddcafe and deadbeef) set at least one of the two low bits. A newly 271 * created znode sets the vfs pointer last of all to indicate that the 272 * znode is known and in a valid state to be moved by this function. 273 */ 274 zfsvfs = ozp->z_zfsvfs; 275 if (!POINTER_IS_VALID(zfsvfs)) { 276 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid); 277 return (KMEM_CBRC_DONT_KNOW); 278 } 279 280 /* 281 * Close a small window in which it's possible that the filesystem could 282 * be unmounted and freed, and zfsvfs, though valid in the previous 283 * statement, could point to unrelated memory by the time we try to 284 * prevent the filesystem from being unmounted. 285 */ 286 rw_enter(&zfsvfs_lock, RW_WRITER); 287 if (zfsvfs != ozp->z_zfsvfs) { 288 rw_exit(&zfsvfs_lock); 289 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1); 290 return (KMEM_CBRC_DONT_KNOW); 291 } 292 293 /* 294 * If the znode is still valid, then so is the file system. We know that 295 * no valid file system can be freed while we hold zfsvfs_lock, so we 296 * can safely ensure that the filesystem is not and will not be 297 * unmounted. The next statement is equivalent to ZFS_ENTER(). 298 */ 299 rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG); 300 if (zfsvfs->z_unmounted) { 301 ZFS_EXIT(zfsvfs); 302 rw_exit(&zfsvfs_lock); 303 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted); 304 return (KMEM_CBRC_DONT_KNOW); 305 } 306 rw_exit(&zfsvfs_lock); 307 308 mutex_enter(&zfsvfs->z_znodes_lock); 309 /* 310 * Recheck the vfs pointer in case the znode was removed just before 311 * acquiring the lock. 312 */ 313 if (zfsvfs != ozp->z_zfsvfs) { 314 mutex_exit(&zfsvfs->z_znodes_lock); 315 ZFS_EXIT(zfsvfs); 316 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2); 317 return (KMEM_CBRC_DONT_KNOW); 318 } 319 320 /* 321 * At this point we know that as long as we hold z_znodes_lock, the 322 * znode cannot be freed and fields within the znode can be safely 323 * accessed. Now, prevent a race with zfs_zget(). 324 */ 325 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) { 326 mutex_exit(&zfsvfs->z_znodes_lock); 327 ZFS_EXIT(zfsvfs); 328 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held); 329 return (KMEM_CBRC_LATER); 330 } 331 332 vp = ZTOV(ozp); 333 if (mutex_tryenter(&vp->v_lock) == 0) { 334 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 335 mutex_exit(&zfsvfs->z_znodes_lock); 336 ZFS_EXIT(zfsvfs); 337 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked); 338 return (KMEM_CBRC_LATER); 339 } 340 341 /* Only move znodes that are referenced _only_ by the DNLC. */ 342 if (vp->v_count != 1 || !vn_in_dnlc(vp)) { 343 mutex_exit(&vp->v_lock); 344 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 345 mutex_exit(&zfsvfs->z_znodes_lock); 346 ZFS_EXIT(zfsvfs); 347 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc); 348 return (KMEM_CBRC_LATER); 349 } 350 351 /* 352 * The znode is known and in a valid state to move. We're holding the 353 * locks needed to execute the critical section. 354 */ 355 zfs_znode_move_impl(ozp, nzp); 356 mutex_exit(&vp->v_lock); 357 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 358 359 list_link_replace(&ozp->z_link_node, &nzp->z_link_node); 360 mutex_exit(&zfsvfs->z_znodes_lock); 361 ZFS_EXIT(zfsvfs); 362 363 return (KMEM_CBRC_YES); 364 } 365 #endif /* illumos */ 366 367 void 368 zfs_znode_init(void) 369 { 370 /* 371 * Initialize zcache 372 */ 373 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL); 374 ASSERT(znode_cache == NULL); 375 znode_cache = kmem_cache_create("zfs_znode_cache", 376 sizeof (znode_t), 0, zfs_znode_cache_constructor, 377 zfs_znode_cache_destructor, NULL, NULL, NULL, 0); 378 kmem_cache_set_move(znode_cache, zfs_znode_move); 379 } 380 381 void 382 zfs_znode_fini(void) 383 { 384 #ifdef illumos 385 /* 386 * Cleanup vfs & vnode ops 387 */ 388 zfs_remove_op_tables(); 389 #endif 390 391 /* 392 * Cleanup zcache 393 */ 394 if (znode_cache) 395 kmem_cache_destroy(znode_cache); 396 znode_cache = NULL; 397 rw_destroy(&zfsvfs_lock); 398 } 399 400 #ifdef illumos 401 struct vnodeops *zfs_dvnodeops; 402 struct vnodeops *zfs_fvnodeops; 403 struct vnodeops *zfs_symvnodeops; 404 struct vnodeops *zfs_xdvnodeops; 405 struct vnodeops *zfs_evnodeops; 406 struct vnodeops *zfs_sharevnodeops; 407 408 void 409 zfs_remove_op_tables() 410 { 411 /* 412 * Remove vfs ops 413 */ 414 ASSERT(zfsfstype); 415 (void) vfs_freevfsops_by_type(zfsfstype); 416 zfsfstype = 0; 417 418 /* 419 * Remove vnode ops 420 */ 421 if (zfs_dvnodeops) 422 vn_freevnodeops(zfs_dvnodeops); 423 if (zfs_fvnodeops) 424 vn_freevnodeops(zfs_fvnodeops); 425 if (zfs_symvnodeops) 426 vn_freevnodeops(zfs_symvnodeops); 427 if (zfs_xdvnodeops) 428 vn_freevnodeops(zfs_xdvnodeops); 429 if (zfs_evnodeops) 430 vn_freevnodeops(zfs_evnodeops); 431 if (zfs_sharevnodeops) 432 vn_freevnodeops(zfs_sharevnodeops); 433 434 zfs_dvnodeops = NULL; 435 zfs_fvnodeops = NULL; 436 zfs_symvnodeops = NULL; 437 zfs_xdvnodeops = NULL; 438 zfs_evnodeops = NULL; 439 zfs_sharevnodeops = NULL; 440 } 441 442 extern const fs_operation_def_t zfs_dvnodeops_template[]; 443 extern const fs_operation_def_t zfs_fvnodeops_template[]; 444 extern const fs_operation_def_t zfs_xdvnodeops_template[]; 445 extern const fs_operation_def_t zfs_symvnodeops_template[]; 446 extern const fs_operation_def_t zfs_evnodeops_template[]; 447 extern const fs_operation_def_t zfs_sharevnodeops_template[]; 448 449 int 450 zfs_create_op_tables() 451 { 452 int error; 453 454 /* 455 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs() 456 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv). 457 * In this case we just return as the ops vectors are already set up. 458 */ 459 if (zfs_dvnodeops) 460 return (0); 461 462 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template, 463 &zfs_dvnodeops); 464 if (error) 465 return (error); 466 467 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template, 468 &zfs_fvnodeops); 469 if (error) 470 return (error); 471 472 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template, 473 &zfs_symvnodeops); 474 if (error) 475 return (error); 476 477 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template, 478 &zfs_xdvnodeops); 479 if (error) 480 return (error); 481 482 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template, 483 &zfs_evnodeops); 484 if (error) 485 return (error); 486 487 error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template, 488 &zfs_sharevnodeops); 489 490 return (error); 491 } 492 #endif /* illumos */ 493 494 int 495 zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx) 496 { 497 zfs_acl_ids_t acl_ids; 498 vattr_t vattr; 499 znode_t *sharezp; 500 znode_t *zp; 501 int error; 502 503 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 504 vattr.va_type = VDIR; 505 vattr.va_mode = S_IFDIR|0555; 506 vattr.va_uid = crgetuid(kcred); 507 vattr.va_gid = crgetgid(kcred); 508 509 sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP); 510 ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs)); 511 sharezp->z_moved = 0; 512 sharezp->z_unlinked = 0; 513 sharezp->z_atime_dirty = 0; 514 sharezp->z_zfsvfs = zfsvfs; 515 sharezp->z_is_sa = zfsvfs->z_use_sa; 516 517 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr, 518 kcred, NULL, &acl_ids)); 519 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids); 520 ASSERT3P(zp, ==, sharezp); 521 POINTER_INVALIDATE(&sharezp->z_zfsvfs); 522 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 523 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx); 524 zfsvfs->z_shares_dir = sharezp->z_id; 525 526 zfs_acl_ids_free(&acl_ids); 527 sa_handle_destroy(sharezp->z_sa_hdl); 528 kmem_cache_free(znode_cache, sharezp); 529 530 return (error); 531 } 532 533 /* 534 * define a couple of values we need available 535 * for both 64 and 32 bit environments. 536 */ 537 #ifndef NBITSMINOR64 538 #define NBITSMINOR64 32 539 #endif 540 #ifndef MAXMAJ64 541 #define MAXMAJ64 0xffffffffUL 542 #endif 543 #ifndef MAXMIN64 544 #define MAXMIN64 0xffffffffUL 545 #endif 546 547 /* 548 * Create special expldev for ZFS private use. 549 * Can't use standard expldev since it doesn't do 550 * what we want. The standard expldev() takes a 551 * dev32_t in LP64 and expands it to a long dev_t. 552 * We need an interface that takes a dev32_t in ILP32 553 * and expands it to a long dev_t. 554 */ 555 static uint64_t 556 zfs_expldev(dev_t dev) 557 { 558 return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev)); 559 } 560 /* 561 * Special cmpldev for ZFS private use. 562 * Can't use standard cmpldev since it takes 563 * a long dev_t and compresses it to dev32_t in 564 * LP64. We need to do a compaction of a long dev_t 565 * to a dev32_t in ILP32. 566 */ 567 dev_t 568 zfs_cmpldev(uint64_t dev) 569 { 570 return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64))); 571 } 572 573 static void 574 zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp, 575 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl) 576 { 577 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs)); 578 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id))); 579 580 ASSERT(zp->z_sa_hdl == NULL); 581 ASSERT(zp->z_acl_cached == NULL); 582 if (sa_hdl == NULL) { 583 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp, 584 SA_HDL_SHARED, &zp->z_sa_hdl)); 585 } else { 586 zp->z_sa_hdl = sa_hdl; 587 sa_set_userp(sa_hdl, zp); 588 } 589 590 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE; 591 592 /* 593 * Slap on VROOT if we are the root znode unless we are the root 594 * node of a snapshot mounted under .zfs. 595 */ 596 if (zp->z_id == zfsvfs->z_root && zfsvfs->z_parent == zfsvfs) 597 ZTOV(zp)->v_flag |= VROOT; 598 599 vn_exists(ZTOV(zp)); 600 } 601 602 void 603 zfs_znode_dmu_fini(znode_t *zp) 604 { 605 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) || 606 zp->z_unlinked || 607 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock)); 608 609 sa_handle_destroy(zp->z_sa_hdl); 610 zp->z_sa_hdl = NULL; 611 } 612 613 #ifdef __FreeBSD__ 614 static void 615 zfs_vnode_forget(vnode_t *vp) 616 { 617 618 /* copied from insmntque_stddtr */ 619 vp->v_data = NULL; 620 vp->v_op = &dead_vnodeops; 621 vgone(vp); 622 vput(vp); 623 } 624 625 /* 626 * Construct a new znode/vnode and intialize. 627 * 628 * This does not do a call to dmu_set_user() that is 629 * up to the caller to do, in case you don't want to 630 * return the znode 631 */ 632 static znode_t * 633 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz, 634 dmu_object_type_t obj_type, sa_handle_t *hdl) 635 { 636 znode_t *zp; 637 vnode_t *vp; 638 uint64_t mode; 639 uint64_t parent; 640 sa_bulk_attr_t bulk[9]; 641 int count = 0; 642 int error; 643 644 zp = kmem_cache_alloc(znode_cache, KM_SLEEP); 645 646 KASSERT(curthread->td_vp_reserv > 0, 647 ("zfs_znode_alloc: getnewvnode without any vnodes reserved")); 648 error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp); 649 if (error != 0) { 650 kmem_cache_free(znode_cache, zp); 651 return (NULL); 652 } 653 zp->z_vnode = vp; 654 vp->v_data = zp; 655 656 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 657 zp->z_moved = 0; 658 659 /* 660 * Defer setting z_zfsvfs until the znode is ready to be a candidate for 661 * the zfs_znode_move() callback. 662 */ 663 zp->z_sa_hdl = NULL; 664 zp->z_unlinked = 0; 665 zp->z_atime_dirty = 0; 666 zp->z_mapcnt = 0; 667 zp->z_id = db->db_object; 668 zp->z_blksz = blksz; 669 zp->z_seq = 0x7A4653; 670 zp->z_sync_cnt = 0; 671 672 vp = ZTOV(zp); 673 674 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl); 675 676 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8); 677 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8); 678 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 679 &zp->z_size, 8); 680 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 681 &zp->z_links, 8); 682 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 683 &zp->z_pflags, 8); 684 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8); 685 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 686 &zp->z_atime, 16); 687 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 688 &zp->z_uid, 8); 689 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 690 &zp->z_gid, 8); 691 692 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) { 693 if (hdl == NULL) 694 sa_handle_destroy(zp->z_sa_hdl); 695 zfs_vnode_forget(vp); 696 zp->z_vnode = NULL; 697 kmem_cache_free(znode_cache, zp); 698 return (NULL); 699 } 700 701 zp->z_mode = mode; 702 703 vp->v_type = IFTOVT((mode_t)mode); 704 705 switch (vp->v_type) { 706 case VDIR: 707 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ 708 break; 709 #ifdef illumos 710 case VBLK: 711 case VCHR: 712 { 713 uint64_t rdev; 714 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), 715 &rdev, sizeof (rdev)) == 0); 716 717 vp->v_rdev = zfs_cmpldev(rdev); 718 } 719 break; 720 #endif 721 case VFIFO: 722 #ifdef illumos 723 case VSOCK: 724 case VDOOR: 725 #endif 726 vp->v_op = &zfs_fifoops; 727 break; 728 case VREG: 729 if (parent == zfsvfs->z_shares_dir) { 730 ASSERT(zp->z_uid == 0 && zp->z_gid == 0); 731 vp->v_op = &zfs_shareops; 732 } 733 break; 734 #ifdef illumos 735 case VLNK: 736 vn_setops(vp, zfs_symvnodeops); 737 break; 738 default: 739 vn_setops(vp, zfs_evnodeops); 740 break; 741 #endif 742 } 743 744 mutex_enter(&zfsvfs->z_znodes_lock); 745 list_insert_tail(&zfsvfs->z_all_znodes, zp); 746 membar_producer(); 747 /* 748 * Everything else must be valid before assigning z_zfsvfs makes the 749 * znode eligible for zfs_znode_move(). 750 */ 751 zp->z_zfsvfs = zfsvfs; 752 mutex_exit(&zfsvfs->z_znodes_lock); 753 754 /* 755 * Acquire vnode lock before making it available to the world. 756 */ 757 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 758 VN_LOCK_AREC(vp); 759 if (vp->v_type != VFIFO) 760 VN_LOCK_ASHARE(vp); 761 762 #ifdef illumos 763 VFS_HOLD(zfsvfs->z_vfs); 764 #endif 765 return (zp); 766 } 767 #endif /* __FreeBSD__ */ 768 769 static uint64_t empty_xattr; 770 static uint64_t pad[4]; 771 static zfs_acl_phys_t acl_phys; 772 /* 773 * Create a new DMU object to hold a zfs znode. 774 * 775 * IN: dzp - parent directory for new znode 776 * vap - file attributes for new znode 777 * tx - dmu transaction id for zap operations 778 * cr - credentials of caller 779 * flag - flags: 780 * IS_ROOT_NODE - new object will be root 781 * IS_XATTR - new object is an attribute 782 * bonuslen - length of bonus buffer 783 * setaclp - File/Dir initial ACL 784 * fuidp - Tracks fuid allocation. 785 * 786 * OUT: zpp - allocated znode 787 * 788 */ 789 void 790 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 791 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids) 792 { 793 uint64_t crtime[2], atime[2], mtime[2], ctime[2]; 794 uint64_t mode, size, links, parent, pflags; 795 uint64_t dzp_pflags = 0; 796 uint64_t rdev = 0; 797 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 798 dmu_buf_t *db; 799 timestruc_t now; 800 uint64_t gen, obj; 801 int err; 802 int bonuslen; 803 sa_handle_t *sa_hdl; 804 dmu_object_type_t obj_type; 805 sa_bulk_attr_t sa_attrs[ZPL_END]; 806 int cnt = 0; 807 zfs_acl_locator_cb_t locate = { 0 }; 808 809 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); 810 811 if (zfsvfs->z_replay) { 812 obj = vap->va_nodeid; 813 now = vap->va_ctime; /* see zfs_replay_create() */ 814 gen = vap->va_nblocks; /* ditto */ 815 } else { 816 obj = 0; 817 vfs_timestamp(&now); 818 gen = dmu_tx_get_txg(tx); 819 } 820 821 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE; 822 bonuslen = (obj_type == DMU_OT_SA) ? 823 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE; 824 825 /* 826 * Create a new DMU object. 827 */ 828 /* 829 * There's currently no mechanism for pre-reading the blocks that will 830 * be needed to allocate a new object, so we accept the small chance 831 * that there will be an i/o error and we will fail one of the 832 * assertions below. 833 */ 834 if (vap->va_type == VDIR) { 835 if (zfsvfs->z_replay) { 836 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj, 837 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 838 obj_type, bonuslen, tx)); 839 } else { 840 obj = zap_create_norm(zfsvfs->z_os, 841 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 842 obj_type, bonuslen, tx); 843 } 844 } else { 845 if (zfsvfs->z_replay) { 846 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj, 847 DMU_OT_PLAIN_FILE_CONTENTS, 0, 848 obj_type, bonuslen, tx)); 849 } else { 850 obj = dmu_object_alloc(zfsvfs->z_os, 851 DMU_OT_PLAIN_FILE_CONTENTS, 0, 852 obj_type, bonuslen, tx); 853 } 854 } 855 856 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 857 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db)); 858 859 /* 860 * If this is the root, fix up the half-initialized parent pointer 861 * to reference the just-allocated physical data area. 862 */ 863 if (flag & IS_ROOT_NODE) { 864 dzp->z_id = obj; 865 } else { 866 dzp_pflags = dzp->z_pflags; 867 } 868 869 /* 870 * If parent is an xattr, so am I. 871 */ 872 if (dzp_pflags & ZFS_XATTR) { 873 flag |= IS_XATTR; 874 } 875 876 if (zfsvfs->z_use_fuids) 877 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; 878 else 879 pflags = 0; 880 881 if (vap->va_type == VDIR) { 882 size = 2; /* contents ("." and "..") */ 883 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1; 884 } else { 885 size = links = 0; 886 } 887 888 if (vap->va_type == VBLK || vap->va_type == VCHR) { 889 rdev = zfs_expldev(vap->va_rdev); 890 } 891 892 parent = dzp->z_id; 893 mode = acl_ids->z_mode; 894 if (flag & IS_XATTR) 895 pflags |= ZFS_XATTR; 896 897 /* 898 * No execs denied will be deterimed when zfs_mode_compute() is called. 899 */ 900 pflags |= acl_ids->z_aclp->z_hints & 901 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT| 902 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED); 903 904 ZFS_TIME_ENCODE(&now, crtime); 905 ZFS_TIME_ENCODE(&now, ctime); 906 907 if (vap->va_mask & AT_ATIME) { 908 ZFS_TIME_ENCODE(&vap->va_atime, atime); 909 } else { 910 ZFS_TIME_ENCODE(&now, atime); 911 } 912 913 if (vap->va_mask & AT_MTIME) { 914 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 915 } else { 916 ZFS_TIME_ENCODE(&now, mtime); 917 } 918 919 /* Now add in all of the "SA" attributes */ 920 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED, 921 &sa_hdl)); 922 923 /* 924 * Setup the array of attributes to be replaced/set on the new file 925 * 926 * order for DMU_OT_ZNODE is critical since it needs to be constructed 927 * in the old znode_phys_t format. Don't change this ordering 928 */ 929 930 if (obj_type == DMU_OT_ZNODE) { 931 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 932 NULL, &atime, 16); 933 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 934 NULL, &mtime, 16); 935 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 936 NULL, &ctime, 16); 937 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 938 NULL, &crtime, 16); 939 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 940 NULL, &gen, 8); 941 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 942 NULL, &mode, 8); 943 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 944 NULL, &size, 8); 945 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 946 NULL, &parent, 8); 947 } else { 948 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 949 NULL, &mode, 8); 950 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 951 NULL, &size, 8); 952 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 953 NULL, &gen, 8); 954 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 955 &acl_ids->z_fuid, 8); 956 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 957 &acl_ids->z_fgid, 8); 958 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 959 NULL, &parent, 8); 960 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 961 NULL, &pflags, 8); 962 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 963 NULL, &atime, 16); 964 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 965 NULL, &mtime, 16); 966 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 967 NULL, &ctime, 16); 968 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 969 NULL, &crtime, 16); 970 } 971 972 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8); 973 974 if (obj_type == DMU_OT_ZNODE) { 975 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL, 976 &empty_xattr, 8); 977 } 978 if (obj_type == DMU_OT_ZNODE || 979 (vap->va_type == VBLK || vap->va_type == VCHR)) { 980 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs), 981 NULL, &rdev, 8); 982 983 } 984 if (obj_type == DMU_OT_ZNODE) { 985 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 986 NULL, &pflags, 8); 987 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 988 &acl_ids->z_fuid, 8); 989 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 990 &acl_ids->z_fgid, 8); 991 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad, 992 sizeof (uint64_t) * 4); 993 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL, 994 &acl_phys, sizeof (zfs_acl_phys_t)); 995 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) { 996 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL, 997 &acl_ids->z_aclp->z_acl_count, 8); 998 locate.cb_aclp = acl_ids->z_aclp; 999 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs), 1000 zfs_acl_data_locator, &locate, 1001 acl_ids->z_aclp->z_acl_bytes); 1002 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags, 1003 acl_ids->z_fuid, acl_ids->z_fgid); 1004 } 1005 1006 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0); 1007 1008 if (!(flag & IS_ROOT_NODE)) { 1009 #ifdef __NetBSD__ 1010 vnode_t *vp; 1011 struct zfs_loadvnode_args args = { db, 0, obj_type, sa_hdl }; 1012 1013 tsd_set(zfs_loadvnode_key, &args); 1014 err = vcache_get(zfsvfs->z_vfs, &obj, sizeof(obj), &vp); 1015 tsd_set(zfs_loadvnode_key, NULL); 1016 1017 ASSERT3U(err, ==, 0); 1018 *zpp = VTOZ(vp); 1019 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1020 #else 1021 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl); 1022 #endif 1023 ASSERT(*zpp != NULL); 1024 } else { 1025 /* 1026 * If we are creating the root node, the "parent" we 1027 * passed in is the znode for the root. 1028 */ 1029 *zpp = dzp; 1030 1031 (*zpp)->z_sa_hdl = sa_hdl; 1032 } 1033 1034 (*zpp)->z_pflags = pflags; 1035 (*zpp)->z_mode = mode; 1036 1037 if (vap->va_mask & AT_XVATTR) 1038 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx); 1039 1040 if (obj_type == DMU_OT_ZNODE || 1041 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) { 1042 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx)); 1043 } 1044 #ifndef __NetBSD__ 1045 if (!(flag & IS_ROOT_NODE)) { 1046 vnode_t *vp; 1047 1048 vp = ZTOV(*zpp); 1049 vp->v_vflag |= VV_FORCEINSMQ; 1050 err = insmntque(vp, zfsvfs->z_vfs); 1051 vp->v_vflag &= ~VV_FORCEINSMQ; 1052 KASSERT(err == 0, ("insmntque() failed: error %d", err)); 1053 } 1054 #endif 1055 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1056 } 1057 1058 /* 1059 * Update in-core attributes. It is assumed the caller will be doing an 1060 * sa_bulk_update to push the changes out. 1061 */ 1062 void 1063 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx) 1064 { 1065 xoptattr_t *xoap; 1066 1067 xoap = xva_getxoptattr(xvap); 1068 ASSERT(xoap); 1069 1070 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 1071 uint64_t times[2]; 1072 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times); 1073 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs), 1074 ×, sizeof (times), tx); 1075 XVA_SET_RTN(xvap, XAT_CREATETIME); 1076 } 1077 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 1078 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly, 1079 zp->z_pflags, tx); 1080 XVA_SET_RTN(xvap, XAT_READONLY); 1081 } 1082 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 1083 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden, 1084 zp->z_pflags, tx); 1085 XVA_SET_RTN(xvap, XAT_HIDDEN); 1086 } 1087 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 1088 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system, 1089 zp->z_pflags, tx); 1090 XVA_SET_RTN(xvap, XAT_SYSTEM); 1091 } 1092 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 1093 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive, 1094 zp->z_pflags, tx); 1095 XVA_SET_RTN(xvap, XAT_ARCHIVE); 1096 } 1097 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 1098 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable, 1099 zp->z_pflags, tx); 1100 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 1101 } 1102 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 1103 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink, 1104 zp->z_pflags, tx); 1105 XVA_SET_RTN(xvap, XAT_NOUNLINK); 1106 } 1107 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 1108 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly, 1109 zp->z_pflags, tx); 1110 XVA_SET_RTN(xvap, XAT_APPENDONLY); 1111 } 1112 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 1113 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump, 1114 zp->z_pflags, tx); 1115 XVA_SET_RTN(xvap, XAT_NODUMP); 1116 } 1117 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 1118 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque, 1119 zp->z_pflags, tx); 1120 XVA_SET_RTN(xvap, XAT_OPAQUE); 1121 } 1122 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 1123 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED, 1124 xoap->xoa_av_quarantined, zp->z_pflags, tx); 1125 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 1126 } 1127 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 1128 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified, 1129 zp->z_pflags, tx); 1130 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 1131 } 1132 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { 1133 zfs_sa_set_scanstamp(zp, xvap, tx); 1134 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); 1135 } 1136 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 1137 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse, 1138 zp->z_pflags, tx); 1139 XVA_SET_RTN(xvap, XAT_REPARSE); 1140 } 1141 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 1142 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline, 1143 zp->z_pflags, tx); 1144 XVA_SET_RTN(xvap, XAT_OFFLINE); 1145 } 1146 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 1147 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse, 1148 zp->z_pflags, tx); 1149 XVA_SET_RTN(xvap, XAT_SPARSE); 1150 } 1151 } 1152 1153 #ifdef __NetBSD__ 1154 1155 static inline int 1156 zfs_do_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp, 1157 int (*get)(struct mount *, const void *, size_t, struct vnode **)) 1158 { 1159 struct vnode *vp; 1160 int err; 1161 1162 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1163 1164 err = (*get)(zfsvfs->z_vfs, &obj_num, sizeof(obj_num), &vp); 1165 if (err) 1166 *zpp = NULL; 1167 else 1168 *zpp = VTOZ(vp); 1169 1170 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1171 1172 return (err); 1173 } 1174 1175 int 1176 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 1177 { 1178 1179 return zfs_do_zget(zfsvfs, obj_num, zpp, vcache_get); 1180 } 1181 1182 int 1183 zfs_zget_cleaner(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 1184 { 1185 dmu_buf_t *db; 1186 sa_handle_t *hdl; 1187 dmu_object_info_t doi; 1188 znode_t *zp; 1189 int err; 1190 1191 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1192 if (err) { 1193 return (SET_ERROR(err)); 1194 } 1195 1196 dmu_object_info_from_db(db, &doi); 1197 if (doi.doi_bonus_type != DMU_OT_SA && 1198 (doi.doi_bonus_type != DMU_OT_ZNODE || 1199 (doi.doi_bonus_type == DMU_OT_ZNODE && 1200 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1201 sa_buf_rele(db, NULL); 1202 return (SET_ERROR(EINVAL)); 1203 } 1204 hdl = dmu_buf_get_user(db); 1205 KASSERT(hdl != NULL); 1206 zp = sa_get_userdata(hdl); 1207 *zpp = zp; 1208 return (0); 1209 } 1210 1211 /* 1212 * Callback from vcache to set up the znode. 1213 * This is largely copied from zfs_znode_alloc(). 1214 */ 1215 1216 int 1217 zfs_loadvnode(struct mount *mp, struct vnode *vp, 1218 const void *key, size_t key_len, const void **new_key) 1219 { 1220 znode_t *zp; 1221 uint64_t mode; 1222 uint64_t parent; 1223 sa_bulk_attr_t bulk[9]; 1224 int count = 0; 1225 int err; 1226 1227 uint64_t obj_num, rdev; 1228 zfsvfs_t *zfsvfs; 1229 dmu_object_info_t doi; 1230 1231 /* args to zfs_zvnode_alloc() */ 1232 struct zfs_loadvnode_args *args; 1233 dmu_buf_t *db; 1234 int blksz; 1235 dmu_object_type_t obj_type; 1236 sa_handle_t *hdl; 1237 1238 KASSERT(key_len == sizeof(obj_num)); 1239 memcpy(&obj_num, key, key_len); 1240 1241 zfsvfs = mp->mnt_data; 1242 1243 args = tsd_get(zfs_loadvnode_key); 1244 if (args) { 1245 db = args->db; 1246 blksz = args->blksz; 1247 obj_type = args->obj_type; 1248 hdl = args->sa_hdl; 1249 goto skip_lookup; 1250 } 1251 1252 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1253 if (err) { 1254 return (SET_ERROR(err)); 1255 } 1256 1257 dmu_object_info_from_db(db, &doi); 1258 if (doi.doi_bonus_type != DMU_OT_SA && 1259 (doi.doi_bonus_type != DMU_OT_ZNODE || 1260 (doi.doi_bonus_type == DMU_OT_ZNODE && 1261 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1262 sa_buf_rele(db, NULL); 1263 return (SET_ERROR(EINVAL)); 1264 } 1265 blksz = doi.doi_data_block_size; 1266 obj_type = doi.doi_bonus_type; 1267 hdl = dmu_buf_get_user(db); 1268 1269 if (hdl != NULL) { 1270 zp = sa_get_userdata(hdl); 1271 1272 /* 1273 * Since "SA" does immediate eviction we 1274 * should never find a sa handle that doesn't 1275 * know about the znode. 1276 */ 1277 ASSERT3P(zp, !=, NULL); 1278 ASSERT3U(zp->z_id, ==, obj_num); 1279 1280 sa_buf_rele(db, NULL); 1281 VFS_HOLD(zfsvfs->z_vfs); 1282 *new_key = &zp->z_id; 1283 return (0); 1284 } 1285 1286 skip_lookup: 1287 vp->v_op = zfs_vnodeop_p; 1288 vp->v_tag = VT_ZFS; 1289 1290 zp = kmem_cache_alloc(znode_cache, KM_SLEEP); 1291 zp->z_vnode = vp; 1292 vp->v_data = zp; 1293 1294 extern const struct genfs_ops zfs_genfsops; 1295 genfs_node_init(vp, &zfs_genfsops); 1296 1297 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 1298 zp->z_moved = 0; 1299 1300 /* 1301 * Defer setting z_zfsvfs until the znode is ready to be a candidate for 1302 * the zfs_znode_move() callback. 1303 */ 1304 zp->z_sa_hdl = NULL; 1305 zp->z_unlinked = 0; 1306 zp->z_atime_dirty = 0; 1307 zp->z_mapcnt = 0; 1308 zp->z_id = db->db_object; 1309 zp->z_blksz = blksz; 1310 zp->z_seq = 0x7A4653; 1311 zp->z_sync_cnt = 0; 1312 1313 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl); 1314 1315 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8); 1316 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8); 1317 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 1318 &zp->z_size, 8); 1319 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 1320 &zp->z_links, 8); 1321 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 1322 &zp->z_pflags, 8); 1323 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8); 1324 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 1325 &zp->z_atime, 16); 1326 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 1327 &zp->z_uid, 8); 1328 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 1329 &zp->z_gid, 8); 1330 1331 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) { 1332 if (hdl == NULL) 1333 sa_handle_destroy(zp->z_sa_hdl); 1334 zp->z_vnode = NULL; 1335 kmem_cache_free(znode_cache, zp); 1336 sa_buf_rele(db, NULL); 1337 return (SET_ERROR(ENOENT)); 1338 } 1339 1340 zp->z_mode = mode; 1341 1342 vp->v_type = IFTOVT((mode_t)zp->z_mode); 1343 1344 switch (vp->v_type) { 1345 case VDIR: 1346 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ 1347 break; 1348 case VBLK: 1349 case VCHR: 1350 /* XXX NetBSD vp->v_op = zfs_specop_p; */ 1351 (void) sa_lookup(hdl, SA_ZPL_RDEV(zfsvfs), &rdev, 1352 sizeof (rdev)); 1353 spec_node_init(vp, zfs_cmpldev(rdev)); 1354 break; 1355 case VFIFO: 1356 /* XXX NetBSD vp->v_op = zfs_fifoop_p; */ 1357 break; 1358 } 1359 1360 uvm_vnp_setsize(vp, zp->z_size); 1361 dprintf("zfs_loadvnode znode %p -- vnode %p\n", zp, vp); 1362 dprintf("zfs_loadvnode z_id %ld\n", zp->z_id); 1363 1364 mutex_enter(&zfsvfs->z_znodes_lock); 1365 list_insert_tail(&zfsvfs->z_all_znodes, zp); 1366 membar_producer(); 1367 1368 /* 1369 * Everything else must be valid before assigning z_zfsvfs makes the 1370 * znode eligible for zfs_znode_move(). 1371 */ 1372 zp->z_zfsvfs = zfsvfs; 1373 mutex_exit(&zfsvfs->z_znodes_lock); 1374 1375 VFS_HOLD(zfsvfs->z_vfs); 1376 *new_key = &zp->z_id; 1377 return (0); 1378 } 1379 1380 #else /* __NetBSD__ */ 1381 1382 int 1383 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 1384 { 1385 dmu_object_info_t doi; 1386 dmu_buf_t *db; 1387 znode_t *zp; 1388 vnode_t *vp; 1389 sa_handle_t *hdl; 1390 struct thread *td; 1391 int locked; 1392 int err; 1393 1394 td = curthread; 1395 getnewvnode_reserve(1); 1396 again: 1397 *zpp = NULL; 1398 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1399 1400 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1401 if (err) { 1402 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1403 getnewvnode_drop_reserve(); 1404 return (err); 1405 } 1406 1407 dmu_object_info_from_db(db, &doi); 1408 if (doi.doi_bonus_type != DMU_OT_SA && 1409 (doi.doi_bonus_type != DMU_OT_ZNODE || 1410 (doi.doi_bonus_type == DMU_OT_ZNODE && 1411 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1412 sa_buf_rele(db, NULL); 1413 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1414 #ifdef __FreeBSD__ 1415 getnewvnode_drop_reserve(); 1416 #endif 1417 return (SET_ERROR(EINVAL)); 1418 } 1419 1420 hdl = dmu_buf_get_user(db); 1421 if (hdl != NULL) { 1422 zp = sa_get_userdata(hdl); 1423 1424 /* 1425 * Since "SA" does immediate eviction we 1426 * should never find a sa handle that doesn't 1427 * know about the znode. 1428 */ 1429 ASSERT3P(zp, !=, NULL); 1430 ASSERT3U(zp->z_id, ==, obj_num); 1431 *zpp = zp; 1432 vp = ZTOV(zp); 1433 1434 /* Don't let the vnode disappear after ZFS_OBJ_HOLD_EXIT. */ 1435 VN_HOLD(vp); 1436 1437 sa_buf_rele(db, NULL); 1438 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1439 1440 locked = VOP_ISLOCKED(vp); 1441 VI_LOCK(vp); 1442 if ((vp->v_iflag & VI_DOOMED) != 0 && 1443 locked != LK_EXCLUSIVE) { 1444 /* 1445 * The vnode is doomed and this thread doesn't 1446 * hold the exclusive lock on it, so the vnode 1447 * must be being reclaimed by another thread. 1448 * Otherwise the doomed vnode is being reclaimed 1449 * by this thread and zfs_zget is called from 1450 * ZIL internals. 1451 */ 1452 VI_UNLOCK(vp); 1453 1454 /* 1455 * XXX vrele() locks the vnode when the last reference 1456 * is dropped. Although in this case the vnode is 1457 * doomed / dead and so no inactivation is required, 1458 * the vnode lock is still acquired. That could result 1459 * in a LOR with z_teardown_lock if another thread holds 1460 * the vnode's lock and tries to take z_teardown_lock. 1461 * But that is only possible if the other thread peforms 1462 * a ZFS vnode operation on the vnode. That either 1463 * should not happen if the vnode is dead or the thread 1464 * should also have a refrence to the vnode and thus 1465 * our reference is not last. 1466 */ 1467 VN_RELE(vp); 1468 goto again; 1469 } 1470 VI_UNLOCK(vp); 1471 getnewvnode_drop_reserve(); 1472 return (0); 1473 } 1474 1475 /* 1476 * Not found create new znode/vnode 1477 * but only if file exists. 1478 * 1479 * There is a small window where zfs_vget() could 1480 * find this object while a file create is still in 1481 * progress. This is checked for in zfs_znode_alloc() 1482 * 1483 * if zfs_znode_alloc() fails it will drop the hold on the 1484 * bonus buffer. 1485 */ 1486 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size, 1487 doi.doi_bonus_type, NULL); 1488 if (zp == NULL) { 1489 err = SET_ERROR(ENOENT); 1490 } else { 1491 *zpp = zp; 1492 } 1493 if (err == 0) { 1494 vnode_t *vp = ZTOV(zp); 1495 1496 err = insmntque(vp, zfsvfs->z_vfs); 1497 if (err == 0) { 1498 vp->v_hash = obj_num; 1499 VOP_UNLOCK(vp, 0); 1500 } else { 1501 zp->z_vnode = NULL; 1502 zfs_znode_dmu_fini(zp); 1503 zfs_znode_free(zp); 1504 *zpp = NULL; 1505 } 1506 } 1507 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1508 getnewvnode_drop_reserve(); 1509 return (err); 1510 } 1511 1512 #endif /* __NetBSD__ */ 1513 1514 int 1515 zfs_rezget(znode_t *zp) 1516 { 1517 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1518 dmu_object_info_t doi; 1519 dmu_buf_t *db; 1520 vnode_t *vp; 1521 uint64_t obj_num = zp->z_id; 1522 uint64_t mode, size; 1523 sa_bulk_attr_t bulk[8]; 1524 int err; 1525 int count = 0; 1526 uint64_t gen; 1527 1528 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1529 1530 mutex_enter(&zp->z_acl_lock); 1531 if (zp->z_acl_cached) { 1532 zfs_acl_free(zp->z_acl_cached); 1533 zp->z_acl_cached = NULL; 1534 } 1535 1536 mutex_exit(&zp->z_acl_lock); 1537 ASSERT(zp->z_sa_hdl == NULL); 1538 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1539 if (err) { 1540 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1541 return (err); 1542 } 1543 1544 dmu_object_info_from_db(db, &doi); 1545 if (doi.doi_bonus_type != DMU_OT_SA && 1546 (doi.doi_bonus_type != DMU_OT_ZNODE || 1547 (doi.doi_bonus_type == DMU_OT_ZNODE && 1548 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1549 sa_buf_rele(db, NULL); 1550 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1551 return (SET_ERROR(EINVAL)); 1552 } 1553 1554 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL); 1555 size = zp->z_size; 1556 1557 /* reload cached values */ 1558 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, 1559 &gen, sizeof (gen)); 1560 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 1561 &zp->z_size, sizeof (zp->z_size)); 1562 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 1563 &zp->z_links, sizeof (zp->z_links)); 1564 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 1565 &zp->z_pflags, sizeof (zp->z_pflags)); 1566 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 1567 &zp->z_atime, sizeof (zp->z_atime)); 1568 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 1569 &zp->z_uid, sizeof (zp->z_uid)); 1570 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 1571 &zp->z_gid, sizeof (zp->z_gid)); 1572 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 1573 &mode, sizeof (mode)); 1574 1575 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) { 1576 zfs_znode_dmu_fini(zp); 1577 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1578 return (SET_ERROR(EIO)); 1579 } 1580 1581 zp->z_mode = mode; 1582 1583 if (gen != zp->z_gen) { 1584 zfs_znode_dmu_fini(zp); 1585 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1586 return (SET_ERROR(EIO)); 1587 } 1588 1589 /* 1590 * It is highly improbable but still quite possible that two 1591 * objects in different datasets are created with the same 1592 * object numbers and in transaction groups with the same 1593 * numbers. znodes corresponding to those objects would 1594 * have the same z_id and z_gen, but their other attributes 1595 * may be different. 1596 * zfs recv -F may replace one of such objects with the other. 1597 * As a result file properties recorded in the replaced 1598 * object's vnode may no longer match the received object's 1599 * properties. At present the only cached property is the 1600 * files type recorded in v_type. 1601 * So, handle this case by leaving the old vnode and znode 1602 * disassociated from the actual object. A new vnode and a 1603 * znode will be created if the object is accessed 1604 * (e.g. via a look-up). The old vnode and znode will be 1605 * recycled when the last vnode reference is dropped. 1606 */ 1607 vp = ZTOV(zp); 1608 if (vp->v_type != IFTOVT((mode_t)zp->z_mode)) { 1609 zfs_znode_dmu_fini(zp); 1610 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1611 return (EIO); 1612 } 1613 1614 zp->z_unlinked = (zp->z_links == 0); 1615 zp->z_blksz = doi.doi_data_block_size; 1616 vn_pages_remove(vp, 0, 0); 1617 if (zp->z_size != size) 1618 vnode_pager_setsize(vp, zp->z_size); 1619 1620 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1621 1622 return (0); 1623 } 1624 1625 void 1626 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) 1627 { 1628 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1629 objset_t *os = zfsvfs->z_os; 1630 uint64_t obj = zp->z_id; 1631 uint64_t acl_obj = zfs_external_acl(zp); 1632 1633 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 1634 if (acl_obj) { 1635 VERIFY(!zp->z_is_sa); 1636 VERIFY(0 == dmu_object_free(os, acl_obj, tx)); 1637 } 1638 VERIFY(0 == dmu_object_free(os, obj, tx)); 1639 zfs_znode_dmu_fini(zp); 1640 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1641 zfs_znode_free(zp); 1642 } 1643 1644 void 1645 zfs_zinactive(znode_t *zp) 1646 { 1647 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1648 uint64_t z_id = zp->z_id; 1649 1650 ASSERT(zp->z_sa_hdl); 1651 1652 /* 1653 * Don't allow a zfs_zget() while were trying to release this znode 1654 */ 1655 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); 1656 1657 /* 1658 * If this was the last reference to a file with no links, 1659 * remove the file from the file system. 1660 */ 1661 if (zp->z_unlinked) { 1662 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1663 zfs_rmnode(zp); 1664 return; 1665 } 1666 1667 zfs_znode_dmu_fini(zp); 1668 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1669 zfs_znode_free(zp); 1670 } 1671 1672 void 1673 zfs_znode_free(znode_t *zp) 1674 { 1675 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1676 1677 #ifdef __NetBSD__ 1678 struct vnode *vp = ZTOV(zp); 1679 1680 genfs_node_destroy(vp); 1681 1682 /* 1683 * Interlock with zfs_sync(). 1684 */ 1685 mutex_enter(vp->v_interlock); 1686 vp->v_data = NULL; 1687 mutex_exit(vp->v_interlock); 1688 #endif 1689 1690 ASSERT(zp->z_sa_hdl == NULL); 1691 zp->z_vnode = NULL; 1692 mutex_enter(&zfsvfs->z_znodes_lock); 1693 POINTER_INVALIDATE(&zp->z_zfsvfs); 1694 list_remove(&zfsvfs->z_all_znodes, zp); 1695 mutex_exit(&zfsvfs->z_znodes_lock); 1696 1697 if (zp->z_acl_cached) { 1698 zfs_acl_free(zp->z_acl_cached); 1699 zp->z_acl_cached = NULL; 1700 } 1701 1702 kmem_cache_free(znode_cache, zp); 1703 1704 #ifdef illumos 1705 VFS_RELE(zfsvfs->z_vfs); 1706 #endif 1707 } 1708 1709 void 1710 zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2], 1711 uint64_t ctime[2], boolean_t have_tx) 1712 { 1713 timestruc_t now; 1714 1715 vfs_timestamp(&now); 1716 1717 if (have_tx) { /* will sa_bulk_update happen really soon? */ 1718 zp->z_atime_dirty = 0; 1719 zp->z_seq++; 1720 } else { 1721 zp->z_atime_dirty = 1; 1722 } 1723 1724 if (flag & AT_ATIME) { 1725 ZFS_TIME_ENCODE(&now, zp->z_atime); 1726 } 1727 1728 if (flag & AT_MTIME) { 1729 ZFS_TIME_ENCODE(&now, mtime); 1730 if (zp->z_zfsvfs->z_use_fuids) { 1731 zp->z_pflags |= (ZFS_ARCHIVE | 1732 ZFS_AV_MODIFIED); 1733 } 1734 } 1735 1736 if (flag & AT_CTIME) { 1737 ZFS_TIME_ENCODE(&now, ctime); 1738 if (zp->z_zfsvfs->z_use_fuids) 1739 zp->z_pflags |= ZFS_ARCHIVE; 1740 } 1741 } 1742 1743 /* 1744 * Grow the block size for a file. 1745 * 1746 * IN: zp - znode of file to free data in. 1747 * size - requested block size 1748 * tx - open transaction. 1749 * 1750 * NOTE: this function assumes that the znode is write locked. 1751 */ 1752 void 1753 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx) 1754 { 1755 int error; 1756 u_longlong_t dummy; 1757 1758 if (size <= zp->z_blksz) 1759 return; 1760 /* 1761 * If the file size is already greater than the current blocksize, 1762 * we will not grow. If there is more than one block in a file, 1763 * the blocksize cannot change. 1764 */ 1765 if (zp->z_blksz && zp->z_size > zp->z_blksz) 1766 return; 1767 1768 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id, 1769 size, 0, tx); 1770 1771 if (error == ENOTSUP) 1772 return; 1773 ASSERT0(error); 1774 1775 /* What blocksize did we actually get? */ 1776 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy); 1777 } 1778 1779 #ifdef illumos 1780 /* 1781 * This is a dummy interface used when pvn_vplist_dirty() should *not* 1782 * be calling back into the fs for a putpage(). E.g.: when truncating 1783 * a file, the pages being "thrown away* don't need to be written out. 1784 */ 1785 /* ARGSUSED */ 1786 static int 1787 zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, 1788 int flags, cred_t *cr) 1789 { 1790 ASSERT(0); 1791 return (0); 1792 } 1793 #endif 1794 1795 /* 1796 * Increase the file length 1797 * 1798 * IN: zp - znode of file to free data in. 1799 * end - new end-of-file 1800 * 1801 * RETURN: 0 on success, error code on failure 1802 */ 1803 static int 1804 zfs_extend(znode_t *zp, uint64_t end) 1805 { 1806 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1807 dmu_tx_t *tx; 1808 rl_t *rl; 1809 uint64_t newblksz; 1810 int error; 1811 1812 /* 1813 * We will change zp_size, lock the whole file. 1814 */ 1815 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1816 1817 /* 1818 * Nothing to do if file already at desired length. 1819 */ 1820 if (end <= zp->z_size) { 1821 zfs_range_unlock(rl); 1822 return (0); 1823 } 1824 tx = dmu_tx_create(zfsvfs->z_os); 1825 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1826 zfs_sa_upgrade_txholds(tx, zp); 1827 if (end > zp->z_blksz && 1828 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) { 1829 /* 1830 * We are growing the file past the current block size. 1831 */ 1832 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) { 1833 /* 1834 * File's blocksize is already larger than the 1835 * "recordsize" property. Only let it grow to 1836 * the next power of 2. 1837 */ 1838 ASSERT(!ISP2(zp->z_blksz)); 1839 newblksz = MIN(end, 1 << highbit64(zp->z_blksz)); 1840 } else { 1841 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz); 1842 } 1843 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); 1844 } else { 1845 newblksz = 0; 1846 } 1847 1848 error = dmu_tx_assign(tx, TXG_WAIT); 1849 if (error) { 1850 dmu_tx_abort(tx); 1851 zfs_range_unlock(rl); 1852 return (error); 1853 } 1854 1855 if (newblksz) 1856 zfs_grow_blocksize(zp, newblksz, tx); 1857 1858 zp->z_size = end; 1859 1860 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs), 1861 &zp->z_size, sizeof (zp->z_size), tx)); 1862 1863 vnode_pager_setsize(ZTOV(zp), end); 1864 1865 zfs_range_unlock(rl); 1866 1867 dmu_tx_commit(tx); 1868 1869 return (0); 1870 } 1871 1872 /* 1873 * Free space in a file. 1874 * 1875 * IN: zp - znode of file to free data in. 1876 * off - start of section to free. 1877 * len - length of section to free. 1878 * 1879 * RETURN: 0 on success, error code on failure 1880 */ 1881 static int 1882 zfs_free_range(znode_t *zp, uint64_t off, uint64_t len) 1883 { 1884 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1885 rl_t *rl; 1886 int error; 1887 1888 /* 1889 * Lock the range being freed. 1890 */ 1891 rl = zfs_range_lock(zp, off, len, RL_WRITER); 1892 1893 /* 1894 * Nothing to do if file already at desired length. 1895 */ 1896 if (off >= zp->z_size) { 1897 zfs_range_unlock(rl); 1898 return (0); 1899 } 1900 1901 if (off + len > zp->z_size) 1902 len = zp->z_size - off; 1903 1904 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len); 1905 1906 if (error == 0) { 1907 /* 1908 * In FreeBSD we cannot free block in the middle of a file, 1909 * but only at the end of a file, so this code path should 1910 * never happen. 1911 */ 1912 vnode_pager_setsize(ZTOV(zp), off); 1913 } 1914 1915 zfs_range_unlock(rl); 1916 1917 return (error); 1918 } 1919 1920 /* 1921 * Truncate a file 1922 * 1923 * IN: zp - znode of file to free data in. 1924 * end - new end-of-file. 1925 * 1926 * RETURN: 0 on success, error code on failure 1927 */ 1928 static int 1929 zfs_trunc(znode_t *zp, uint64_t end) 1930 { 1931 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1932 vnode_t *vp = ZTOV(zp); 1933 dmu_tx_t *tx; 1934 rl_t *rl; 1935 int error; 1936 sa_bulk_attr_t bulk[2]; 1937 int count = 0; 1938 1939 /* 1940 * We will change zp_size, lock the whole file. 1941 */ 1942 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1943 1944 /* 1945 * Nothing to do if file already at desired length. 1946 */ 1947 if (end >= zp->z_size) { 1948 zfs_range_unlock(rl); 1949 return (0); 1950 } 1951 1952 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1); 1953 if (error) { 1954 zfs_range_unlock(rl); 1955 return (error); 1956 } 1957 tx = dmu_tx_create(zfsvfs->z_os); 1958 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1959 zfs_sa_upgrade_txholds(tx, zp); 1960 dmu_tx_mark_netfree(tx); 1961 error = dmu_tx_assign(tx, TXG_WAIT); 1962 if (error) { 1963 dmu_tx_abort(tx); 1964 zfs_range_unlock(rl); 1965 return (error); 1966 } 1967 1968 zp->z_size = end; 1969 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), 1970 NULL, &zp->z_size, sizeof (zp->z_size)); 1971 1972 if (end == 0) { 1973 zp->z_pflags &= ~ZFS_SPARSE; 1974 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1975 NULL, &zp->z_pflags, 8); 1976 } 1977 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0); 1978 1979 dmu_tx_commit(tx); 1980 1981 /* 1982 * Clear any mapped pages in the truncated region. This has to 1983 * happen outside of the transaction to avoid the possibility of 1984 * a deadlock with someone trying to push a page that we are 1985 * about to invalidate. 1986 */ 1987 vnode_pager_setsize(vp, end); 1988 1989 zfs_range_unlock(rl); 1990 1991 return (0); 1992 } 1993 1994 /* 1995 * Free space in a file 1996 * 1997 * IN: zp - znode of file to free data in. 1998 * off - start of range 1999 * len - end of range (0 => EOF) 2000 * flag - current file open mode flags. 2001 * log - TRUE if this action should be logged 2002 * 2003 * RETURN: 0 on success, error code on failure 2004 */ 2005 int 2006 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) 2007 { 2008 vnode_t *vp = ZTOV(zp); 2009 dmu_tx_t *tx; 2010 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2011 zilog_t *zilog = zfsvfs->z_log; 2012 uint64_t mode; 2013 uint64_t mtime[2], ctime[2]; 2014 sa_bulk_attr_t bulk[3]; 2015 int count = 0; 2016 int error; 2017 2018 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode, 2019 sizeof (mode))) != 0) 2020 return (error); 2021 2022 if (off > zp->z_size) { 2023 error = zfs_extend(zp, off+len); 2024 if (error == 0 && log) 2025 goto log; 2026 else 2027 return (error); 2028 } 2029 2030 /* 2031 * Check for any locks in the region to be freed. 2032 */ 2033 2034 if (MANDLOCK(vp, (mode_t)mode)) { 2035 uint64_t length = (len ? len : zp->z_size - off); 2036 if (error = chklock(vp, FWRITE, off, length, flag, NULL)) 2037 return (error); 2038 } 2039 2040 if (len == 0) { 2041 error = zfs_trunc(zp, off); 2042 } else { 2043 if ((error = zfs_free_range(zp, off, len)) == 0 && 2044 off + len > zp->z_size) 2045 error = zfs_extend(zp, off+len); 2046 } 2047 if (error || !log) 2048 return (error); 2049 log: 2050 tx = dmu_tx_create(zfsvfs->z_os); 2051 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 2052 zfs_sa_upgrade_txholds(tx, zp); 2053 error = dmu_tx_assign(tx, TXG_WAIT); 2054 if (error) { 2055 dmu_tx_abort(tx); 2056 return (error); 2057 } 2058 2059 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16); 2060 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16); 2061 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 2062 NULL, &zp->z_pflags, 8); 2063 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); 2064 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 2065 ASSERT(error == 0); 2066 2067 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); 2068 2069 dmu_tx_commit(tx); 2070 return (0); 2071 } 2072 2073 void 2074 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) 2075 { 2076 uint64_t moid, obj, sa_obj, version; 2077 uint64_t sense = ZFS_CASE_SENSITIVE; 2078 uint64_t norm = 0; 2079 nvpair_t *elem; 2080 int error; 2081 int i; 2082 znode_t *rootzp = NULL; 2083 zfsvfs_t *zfsvfs; 2084 vattr_t vattr; 2085 znode_t *zp; 2086 zfs_acl_ids_t acl_ids; 2087 2088 /* 2089 * First attempt to create master node. 2090 */ 2091 /* 2092 * In an empty objset, there are no blocks to read and thus 2093 * there can be no i/o errors (which we assert below). 2094 */ 2095 moid = MASTER_NODE_OBJ; 2096 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE, 2097 DMU_OT_NONE, 0, tx); 2098 ASSERT(error == 0); 2099 2100 /* 2101 * Set starting attributes. 2102 */ 2103 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os))); 2104 elem = NULL; 2105 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) { 2106 /* For the moment we expect all zpl props to be uint64_ts */ 2107 uint64_t val; 2108 char *name; 2109 2110 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64); 2111 VERIFY(nvpair_value_uint64(elem, &val) == 0); 2112 name = nvpair_name(elem); 2113 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) { 2114 if (val < version) 2115 version = val; 2116 } else { 2117 error = zap_update(os, moid, name, 8, 1, &val, tx); 2118 } 2119 ASSERT(error == 0); 2120 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0) 2121 norm = val; 2122 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0) 2123 sense = val; 2124 } 2125 ASSERT(version != 0); 2126 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx); 2127 2128 /* 2129 * Create zap object used for SA attribute registration 2130 */ 2131 2132 if (version >= ZPL_VERSION_SA) { 2133 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 2134 DMU_OT_NONE, 0, tx); 2135 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 2136 ASSERT(error == 0); 2137 } else { 2138 sa_obj = 0; 2139 } 2140 /* 2141 * Create a delete queue. 2142 */ 2143 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); 2144 2145 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx); 2146 ASSERT(error == 0); 2147 2148 /* 2149 * Create root znode. Create minimal znode/vnode/zfsvfs 2150 * to allow zfs_mknode to work. 2151 */ 2152 VATTR_NULL(&vattr); 2153 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 2154 vattr.va_type = VDIR; 2155 vattr.va_mode = S_IFDIR|0755; 2156 vattr.va_uid = crgetuid(cr); 2157 vattr.va_gid = crgetgid(cr); 2158 2159 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 2160 2161 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP); 2162 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs)); 2163 rootzp->z_moved = 0; 2164 rootzp->z_unlinked = 0; 2165 rootzp->z_atime_dirty = 0; 2166 rootzp->z_is_sa = USE_SA(version, os); 2167 2168 zfsvfs->z_os = os; 2169 zfsvfs->z_parent = zfsvfs; 2170 zfsvfs->z_version = version; 2171 zfsvfs->z_use_fuids = USE_FUIDS(version, os); 2172 zfsvfs->z_use_sa = USE_SA(version, os); 2173 zfsvfs->z_norm = norm; 2174 2175 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 2176 &zfsvfs->z_attr_table); 2177 2178 ASSERT(error == 0); 2179 2180 /* 2181 * Fold case on file systems that are always or sometimes case 2182 * insensitive. 2183 */ 2184 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED) 2185 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 2186 2187 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 2188 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 2189 offsetof(znode_t, z_link_node)); 2190 2191 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 2192 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 2193 2194 rootzp->z_zfsvfs = zfsvfs; 2195 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr, 2196 cr, NULL, &acl_ids)); 2197 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids); 2198 ASSERT3P(zp, ==, rootzp); 2199 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); 2200 ASSERT(error == 0); 2201 zfs_acl_ids_free(&acl_ids); 2202 POINTER_INVALIDATE(&rootzp->z_zfsvfs); 2203 2204 sa_handle_destroy(rootzp->z_sa_hdl); 2205 kmem_cache_free(znode_cache, rootzp); 2206 2207 /* 2208 * Create shares directory 2209 */ 2210 2211 error = zfs_create_share_dir(zfsvfs, tx); 2212 2213 ASSERT(error == 0); 2214 2215 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 2216 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 2217 mutex_destroy(&zfsvfs->z_znodes_lock); 2218 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 2219 } 2220 #endif /* _KERNEL */ 2221 2222 static int 2223 zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table) 2224 { 2225 uint64_t sa_obj = 0; 2226 int error; 2227 2228 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj); 2229 if (error != 0 && error != ENOENT) 2230 return (error); 2231 2232 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table); 2233 return (error); 2234 } 2235 2236 static int 2237 zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp, 2238 dmu_buf_t **db, void *tag) 2239 { 2240 dmu_object_info_t doi; 2241 int error; 2242 2243 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0) 2244 return (error); 2245 2246 dmu_object_info_from_db(*db, &doi); 2247 if ((doi.doi_bonus_type != DMU_OT_SA && 2248 doi.doi_bonus_type != DMU_OT_ZNODE) || 2249 doi.doi_bonus_type == DMU_OT_ZNODE && 2250 doi.doi_bonus_size < sizeof (znode_phys_t)) { 2251 sa_buf_rele(*db, tag); 2252 return (SET_ERROR(ENOTSUP)); 2253 } 2254 2255 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp); 2256 if (error != 0) { 2257 sa_buf_rele(*db, tag); 2258 return (error); 2259 } 2260 2261 return (0); 2262 } 2263 2264 void 2265 zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag) 2266 { 2267 sa_handle_destroy(hdl); 2268 sa_buf_rele(db, tag); 2269 } 2270 2271 /* 2272 * Given an object number, return its parent object number and whether 2273 * or not the object is an extended attribute directory. 2274 */ 2275 static int 2276 zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table, 2277 uint64_t *pobjp, int *is_xattrdir) 2278 { 2279 uint64_t parent; 2280 uint64_t pflags; 2281 uint64_t mode; 2282 uint64_t parent_mode; 2283 sa_bulk_attr_t bulk[3]; 2284 sa_handle_t *sa_hdl; 2285 dmu_buf_t *sa_db; 2286 int count = 0; 2287 int error; 2288 2289 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL, 2290 &parent, sizeof (parent)); 2291 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL, 2292 &pflags, sizeof (pflags)); 2293 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2294 &mode, sizeof (mode)); 2295 2296 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0) 2297 return (error); 2298 2299 /* 2300 * When a link is removed its parent pointer is not changed and will 2301 * be invalid. There are two cases where a link is removed but the 2302 * file stays around, when it goes to the delete queue and when there 2303 * are additional links. 2304 */ 2305 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG); 2306 if (error != 0) 2307 return (error); 2308 2309 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode)); 2310 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2311 if (error != 0) 2312 return (error); 2313 2314 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode); 2315 2316 /* 2317 * Extended attributes can be applied to files, directories, etc. 2318 * Otherwise the parent must be a directory. 2319 */ 2320 if (!*is_xattrdir && !S_ISDIR(parent_mode)) 2321 return (SET_ERROR(EINVAL)); 2322 2323 *pobjp = parent; 2324 2325 return (0); 2326 } 2327 2328 /* 2329 * Given an object number, return some zpl level statistics 2330 */ 2331 static int 2332 zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table, 2333 zfs_stat_t *sb) 2334 { 2335 sa_bulk_attr_t bulk[4]; 2336 int count = 0; 2337 2338 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2339 &sb->zs_mode, sizeof (sb->zs_mode)); 2340 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL, 2341 &sb->zs_gen, sizeof (sb->zs_gen)); 2342 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL, 2343 &sb->zs_links, sizeof (sb->zs_links)); 2344 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL, 2345 &sb->zs_ctime, sizeof (sb->zs_ctime)); 2346 2347 return (sa_bulk_lookup(hdl, bulk, count)); 2348 } 2349 2350 static int 2351 zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl, 2352 sa_attr_type_t *sa_table, char *buf, int len) 2353 { 2354 sa_handle_t *sa_hdl; 2355 sa_handle_t *prevhdl = NULL; 2356 dmu_buf_t *prevdb = NULL; 2357 dmu_buf_t *sa_db = NULL; 2358 char *path = buf + len - 1; 2359 int error; 2360 2361 *path = '\0'; 2362 sa_hdl = hdl; 2363 2364 for (;;) { 2365 uint64_t pobj; 2366 char component[MAXNAMELEN + 2]; 2367 size_t complen; 2368 int is_xattrdir; 2369 2370 if (prevdb) 2371 zfs_release_sa_handle(prevhdl, prevdb, FTAG); 2372 2373 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj, 2374 &is_xattrdir)) != 0) 2375 break; 2376 2377 if (pobj == obj) { 2378 if (path[0] != '/') 2379 *--path = '/'; 2380 break; 2381 } 2382 2383 component[0] = '/'; 2384 if (is_xattrdir) { 2385 (void) sprintf(component + 1, "<xattrdir>"); 2386 } else { 2387 error = zap_value_search(osp, pobj, obj, 2388 ZFS_DIRENT_OBJ(-1ULL), component + 1); 2389 if (error != 0) 2390 break; 2391 } 2392 2393 complen = strlen(component); 2394 path -= complen; 2395 ASSERT(path >= buf); 2396 bcopy(component, path, complen); 2397 obj = pobj; 2398 2399 if (sa_hdl != hdl) { 2400 prevhdl = sa_hdl; 2401 prevdb = sa_db; 2402 } 2403 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG); 2404 if (error != 0) { 2405 sa_hdl = prevhdl; 2406 sa_db = prevdb; 2407 break; 2408 } 2409 } 2410 2411 if (sa_hdl != NULL && sa_hdl != hdl) { 2412 ASSERT(sa_db != NULL); 2413 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2414 } 2415 2416 if (error == 0) 2417 (void) memmove(buf, path, buf + len - path); 2418 2419 return (error); 2420 } 2421 2422 int 2423 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) 2424 { 2425 sa_attr_type_t *sa_table; 2426 sa_handle_t *hdl; 2427 dmu_buf_t *db; 2428 int error; 2429 2430 error = zfs_sa_setup(osp, &sa_table); 2431 if (error != 0) 2432 return (error); 2433 2434 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2435 if (error != 0) 2436 return (error); 2437 2438 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2439 2440 zfs_release_sa_handle(hdl, db, FTAG); 2441 return (error); 2442 } 2443 2444 int 2445 zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb, 2446 char *buf, int len) 2447 { 2448 char *path = buf + len - 1; 2449 sa_attr_type_t *sa_table; 2450 sa_handle_t *hdl; 2451 dmu_buf_t *db; 2452 int error; 2453 2454 *path = '\0'; 2455 2456 error = zfs_sa_setup(osp, &sa_table); 2457 if (error != 0) 2458 return (error); 2459 2460 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2461 if (error != 0) 2462 return (error); 2463 2464 error = zfs_obj_to_stats_impl(hdl, sa_table, sb); 2465 if (error != 0) { 2466 zfs_release_sa_handle(hdl, db, FTAG); 2467 return (error); 2468 } 2469 2470 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2471 2472 zfs_release_sa_handle(hdl, db, FTAG); 2473 return (error); 2474 } 2475 2476 #ifdef _KERNEL 2477 int 2478 zfs_znode_parent_and_name(znode_t *zp, znode_t **dzpp, char *buf) 2479 { 2480 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2481 uint64_t parent; 2482 int is_xattrdir; 2483 int err; 2484 2485 /* Extended attributes should not be visible as regular files. */ 2486 if ((zp->z_pflags & ZFS_XATTR) != 0) 2487 return (SET_ERROR(EINVAL)); 2488 2489 err = zfs_obj_to_pobj(zfsvfs->z_os, zp->z_sa_hdl, zfsvfs->z_attr_table, 2490 &parent, &is_xattrdir); 2491 if (err != 0) 2492 return (err); 2493 ASSERT0(is_xattrdir); 2494 2495 /* No name as this is a root object. */ 2496 if (parent == zp->z_id) 2497 return (SET_ERROR(EINVAL)); 2498 2499 err = zap_value_search(zfsvfs->z_os, parent, zp->z_id, 2500 ZFS_DIRENT_OBJ(-1ULL), buf); 2501 if (err != 0) 2502 return (err); 2503 err = zfs_zget(zfsvfs, parent, dzpp); 2504 return (err); 2505 } 2506 #endif /* _KERNEL */ 2507