zfs_znode.c revision 241628
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 by Delphix. All rights reserved. 24 */ 25 26/* Portions Copyright 2007 Jeremy Teo */ 27/* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */ 28 29#ifdef _KERNEL 30#include <sys/types.h> 31#include <sys/param.h> 32#include <sys/time.h> 33#include <sys/systm.h> 34#include <sys/sysmacros.h> 35#include <sys/resource.h> 36#include <sys/mntent.h> 37#include <sys/u8_textprep.h> 38#include <sys/dsl_dataset.h> 39#include <sys/vfs.h> 40#include <sys/vnode.h> 41#include <sys/file.h> 42#include <sys/kmem.h> 43#include <sys/errno.h> 44#include <sys/unistd.h> 45#include <sys/atomic.h> 46#include <sys/zfs_dir.h> 47#include <sys/zfs_acl.h> 48#include <sys/zfs_ioctl.h> 49#include <sys/zfs_rlock.h> 50#include <sys/zfs_fuid.h> 51#include <sys/dnode.h> 52#include <sys/fs/zfs.h> 53#include <sys/kidmap.h> 54#endif /* _KERNEL */ 55 56#include <sys/dmu.h> 57#include <sys/refcount.h> 58#include <sys/stat.h> 59#include <sys/zap.h> 60#include <sys/zfs_znode.h> 61#include <sys/sa.h> 62#include <sys/zfs_sa.h> 63#include <sys/zfs_stat.h> 64#include <sys/refcount.h> 65 66#include "zfs_prop.h" 67#include "zfs_comutil.h" 68 69/* Used by fstat(1). */ 70SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD, 0, sizeof(znode_t), 71 "sizeof(znode_t)"); 72 73/* 74 * Define ZNODE_STATS to turn on statistic gathering. By default, it is only 75 * turned on when DEBUG is also defined. 76 */ 77#ifdef DEBUG 78#define ZNODE_STATS 79#endif /* DEBUG */ 80 81#ifdef ZNODE_STATS 82#define ZNODE_STAT_ADD(stat) ((stat)++) 83#else 84#define ZNODE_STAT_ADD(stat) /* nothing */ 85#endif /* ZNODE_STATS */ 86 87/* 88 * Functions needed for userland (ie: libzpool) are not put under 89 * #ifdef_KERNEL; the rest of the functions have dependencies 90 * (such as VFS logic) that will not compile easily in userland. 91 */ 92#ifdef _KERNEL 93/* 94 * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to 95 * be freed before it can be safely accessed. 96 */ 97krwlock_t zfsvfs_lock; 98 99static kmem_cache_t *znode_cache = NULL; 100 101/*ARGSUSED*/ 102static void 103znode_evict_error(dmu_buf_t *dbuf, void *user_ptr) 104{ 105 /* 106 * We should never drop all dbuf refs without first clearing 107 * the eviction callback. 108 */ 109 panic("evicting znode %p\n", user_ptr); 110} 111 112extern struct vop_vector zfs_vnodeops; 113extern struct vop_vector zfs_fifoops; 114extern struct vop_vector zfs_shareops; 115 116/* 117 * XXX: We cannot use this function as a cache constructor, because 118 * there is one global cache for all file systems and we need 119 * to pass vfsp here, which is not possible, because argument 120 * 'cdrarg' is defined at kmem_cache_create() time. 121 */ 122/*ARGSUSED*/ 123static int 124zfs_znode_cache_constructor(void *buf, void *arg, int kmflags) 125{ 126 znode_t *zp = buf; 127 vnode_t *vp; 128 vfs_t *vfsp = arg; 129 int error; 130 131 POINTER_INVALIDATE(&zp->z_zfsvfs); 132 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 133 134 if (vfsp != NULL) { 135 error = getnewvnode("zfs", vfsp, &zfs_vnodeops, &vp); 136 if (error != 0 && (kmflags & KM_NOSLEEP)) 137 return (-1); 138 ASSERT(error == 0); 139 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 140 zp->z_vnode = vp; 141 vp->v_data = (caddr_t)zp; 142 VN_LOCK_AREC(vp); 143 VN_LOCK_ASHARE(vp); 144 } else { 145 zp->z_vnode = NULL; 146 } 147 148 list_link_init(&zp->z_link_node); 149 150 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL); 151 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL); 152 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL); 153 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL); 154 155 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL); 156 avl_create(&zp->z_range_avl, zfs_range_compare, 157 sizeof (rl_t), offsetof(rl_t, r_node)); 158 159 zp->z_dirlocks = NULL; 160 zp->z_acl_cached = NULL; 161 zp->z_moved = 0; 162 return (0); 163} 164 165/*ARGSUSED*/ 166static void 167zfs_znode_cache_destructor(void *buf, void *arg) 168{ 169 znode_t *zp = buf; 170 171 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 172 ASSERT(ZTOV(zp) == NULL); 173 vn_free(ZTOV(zp)); 174 ASSERT(!list_link_active(&zp->z_link_node)); 175 mutex_destroy(&zp->z_lock); 176 rw_destroy(&zp->z_parent_lock); 177 rw_destroy(&zp->z_name_lock); 178 mutex_destroy(&zp->z_acl_lock); 179 avl_destroy(&zp->z_range_avl); 180 mutex_destroy(&zp->z_range_lock); 181 182 ASSERT(zp->z_dirlocks == NULL); 183 ASSERT(zp->z_acl_cached == NULL); 184} 185 186#ifdef ZNODE_STATS 187static struct { 188 uint64_t zms_zfsvfs_invalid; 189 uint64_t zms_zfsvfs_recheck1; 190 uint64_t zms_zfsvfs_unmounted; 191 uint64_t zms_zfsvfs_recheck2; 192 uint64_t zms_obj_held; 193 uint64_t zms_vnode_locked; 194 uint64_t zms_not_only_dnlc; 195} znode_move_stats; 196#endif /* ZNODE_STATS */ 197 198#ifdef sun 199static void 200zfs_znode_move_impl(znode_t *ozp, znode_t *nzp) 201{ 202 vnode_t *vp; 203 204 /* Copy fields. */ 205 nzp->z_zfsvfs = ozp->z_zfsvfs; 206 207 /* Swap vnodes. */ 208 vp = nzp->z_vnode; 209 nzp->z_vnode = ozp->z_vnode; 210 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */ 211 ZTOV(ozp)->v_data = ozp; 212 ZTOV(nzp)->v_data = nzp; 213 214 nzp->z_id = ozp->z_id; 215 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */ 216 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0); 217 nzp->z_unlinked = ozp->z_unlinked; 218 nzp->z_atime_dirty = ozp->z_atime_dirty; 219 nzp->z_zn_prefetch = ozp->z_zn_prefetch; 220 nzp->z_blksz = ozp->z_blksz; 221 nzp->z_seq = ozp->z_seq; 222 nzp->z_mapcnt = ozp->z_mapcnt; 223 nzp->z_gen = ozp->z_gen; 224 nzp->z_sync_cnt = ozp->z_sync_cnt; 225 nzp->z_is_sa = ozp->z_is_sa; 226 nzp->z_sa_hdl = ozp->z_sa_hdl; 227 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2); 228 nzp->z_links = ozp->z_links; 229 nzp->z_size = ozp->z_size; 230 nzp->z_pflags = ozp->z_pflags; 231 nzp->z_uid = ozp->z_uid; 232 nzp->z_gid = ozp->z_gid; 233 nzp->z_mode = ozp->z_mode; 234 235 /* 236 * Since this is just an idle znode and kmem is already dealing with 237 * memory pressure, release any cached ACL. 238 */ 239 if (ozp->z_acl_cached) { 240 zfs_acl_free(ozp->z_acl_cached); 241 ozp->z_acl_cached = NULL; 242 } 243 244 sa_set_userp(nzp->z_sa_hdl, nzp); 245 246 /* 247 * Invalidate the original znode by clearing fields that provide a 248 * pointer back to the znode. Set the low bit of the vfs pointer to 249 * ensure that zfs_znode_move() recognizes the znode as invalid in any 250 * subsequent callback. 251 */ 252 ozp->z_sa_hdl = NULL; 253 POINTER_INVALIDATE(&ozp->z_zfsvfs); 254 255 /* 256 * Mark the znode. 257 */ 258 nzp->z_moved = 1; 259 ozp->z_moved = (uint8_t)-1; 260} 261 262/*ARGSUSED*/ 263static kmem_cbrc_t 264zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg) 265{ 266 znode_t *ozp = buf, *nzp = newbuf; 267 zfsvfs_t *zfsvfs; 268 vnode_t *vp; 269 270 /* 271 * The znode is on the file system's list of known znodes if the vfs 272 * pointer is valid. We set the low bit of the vfs pointer when freeing 273 * the znode to invalidate it, and the memory patterns written by kmem 274 * (baddcafe and deadbeef) set at least one of the two low bits. A newly 275 * created znode sets the vfs pointer last of all to indicate that the 276 * znode is known and in a valid state to be moved by this function. 277 */ 278 zfsvfs = ozp->z_zfsvfs; 279 if (!POINTER_IS_VALID(zfsvfs)) { 280 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid); 281 return (KMEM_CBRC_DONT_KNOW); 282 } 283 284 /* 285 * Close a small window in which it's possible that the filesystem could 286 * be unmounted and freed, and zfsvfs, though valid in the previous 287 * statement, could point to unrelated memory by the time we try to 288 * prevent the filesystem from being unmounted. 289 */ 290 rw_enter(&zfsvfs_lock, RW_WRITER); 291 if (zfsvfs != ozp->z_zfsvfs) { 292 rw_exit(&zfsvfs_lock); 293 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1); 294 return (KMEM_CBRC_DONT_KNOW); 295 } 296 297 /* 298 * If the znode is still valid, then so is the file system. We know that 299 * no valid file system can be freed while we hold zfsvfs_lock, so we 300 * can safely ensure that the filesystem is not and will not be 301 * unmounted. The next statement is equivalent to ZFS_ENTER(). 302 */ 303 rrw_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG); 304 if (zfsvfs->z_unmounted) { 305 ZFS_EXIT(zfsvfs); 306 rw_exit(&zfsvfs_lock); 307 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted); 308 return (KMEM_CBRC_DONT_KNOW); 309 } 310 rw_exit(&zfsvfs_lock); 311 312 mutex_enter(&zfsvfs->z_znodes_lock); 313 /* 314 * Recheck the vfs pointer in case the znode was removed just before 315 * acquiring the lock. 316 */ 317 if (zfsvfs != ozp->z_zfsvfs) { 318 mutex_exit(&zfsvfs->z_znodes_lock); 319 ZFS_EXIT(zfsvfs); 320 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2); 321 return (KMEM_CBRC_DONT_KNOW); 322 } 323 324 /* 325 * At this point we know that as long as we hold z_znodes_lock, the 326 * znode cannot be freed and fields within the znode can be safely 327 * accessed. Now, prevent a race with zfs_zget(). 328 */ 329 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) { 330 mutex_exit(&zfsvfs->z_znodes_lock); 331 ZFS_EXIT(zfsvfs); 332 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held); 333 return (KMEM_CBRC_LATER); 334 } 335 336 vp = ZTOV(ozp); 337 if (mutex_tryenter(&vp->v_lock) == 0) { 338 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 339 mutex_exit(&zfsvfs->z_znodes_lock); 340 ZFS_EXIT(zfsvfs); 341 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked); 342 return (KMEM_CBRC_LATER); 343 } 344 345 /* Only move znodes that are referenced _only_ by the DNLC. */ 346 if (vp->v_count != 1 || !vn_in_dnlc(vp)) { 347 mutex_exit(&vp->v_lock); 348 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 349 mutex_exit(&zfsvfs->z_znodes_lock); 350 ZFS_EXIT(zfsvfs); 351 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc); 352 return (KMEM_CBRC_LATER); 353 } 354 355 /* 356 * The znode is known and in a valid state to move. We're holding the 357 * locks needed to execute the critical section. 358 */ 359 zfs_znode_move_impl(ozp, nzp); 360 mutex_exit(&vp->v_lock); 361 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 362 363 list_link_replace(&ozp->z_link_node, &nzp->z_link_node); 364 mutex_exit(&zfsvfs->z_znodes_lock); 365 ZFS_EXIT(zfsvfs); 366 367 return (KMEM_CBRC_YES); 368} 369#endif /* sun */ 370 371void 372zfs_znode_init(void) 373{ 374 /* 375 * Initialize zcache 376 */ 377 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL); 378 ASSERT(znode_cache == NULL); 379 znode_cache = kmem_cache_create("zfs_znode_cache", 380 sizeof (znode_t), 0, /* zfs_znode_cache_constructor */ NULL, 381 zfs_znode_cache_destructor, NULL, NULL, NULL, 0); 382 kmem_cache_set_move(znode_cache, zfs_znode_move); 383} 384 385void 386zfs_znode_fini(void) 387{ 388#ifdef sun 389 /* 390 * Cleanup vfs & vnode ops 391 */ 392 zfs_remove_op_tables(); 393#endif /* sun */ 394 395 /* 396 * Cleanup zcache 397 */ 398 if (znode_cache) 399 kmem_cache_destroy(znode_cache); 400 znode_cache = NULL; 401 rw_destroy(&zfsvfs_lock); 402} 403 404#ifdef sun 405struct vnodeops *zfs_dvnodeops; 406struct vnodeops *zfs_fvnodeops; 407struct vnodeops *zfs_symvnodeops; 408struct vnodeops *zfs_xdvnodeops; 409struct vnodeops *zfs_evnodeops; 410struct vnodeops *zfs_sharevnodeops; 411 412void 413zfs_remove_op_tables() 414{ 415 /* 416 * Remove vfs ops 417 */ 418 ASSERT(zfsfstype); 419 (void) vfs_freevfsops_by_type(zfsfstype); 420 zfsfstype = 0; 421 422 /* 423 * Remove vnode ops 424 */ 425 if (zfs_dvnodeops) 426 vn_freevnodeops(zfs_dvnodeops); 427 if (zfs_fvnodeops) 428 vn_freevnodeops(zfs_fvnodeops); 429 if (zfs_symvnodeops) 430 vn_freevnodeops(zfs_symvnodeops); 431 if (zfs_xdvnodeops) 432 vn_freevnodeops(zfs_xdvnodeops); 433 if (zfs_evnodeops) 434 vn_freevnodeops(zfs_evnodeops); 435 if (zfs_sharevnodeops) 436 vn_freevnodeops(zfs_sharevnodeops); 437 438 zfs_dvnodeops = NULL; 439 zfs_fvnodeops = NULL; 440 zfs_symvnodeops = NULL; 441 zfs_xdvnodeops = NULL; 442 zfs_evnodeops = NULL; 443 zfs_sharevnodeops = NULL; 444} 445 446extern const fs_operation_def_t zfs_dvnodeops_template[]; 447extern const fs_operation_def_t zfs_fvnodeops_template[]; 448extern const fs_operation_def_t zfs_xdvnodeops_template[]; 449extern const fs_operation_def_t zfs_symvnodeops_template[]; 450extern const fs_operation_def_t zfs_evnodeops_template[]; 451extern const fs_operation_def_t zfs_sharevnodeops_template[]; 452 453int 454zfs_create_op_tables() 455{ 456 int error; 457 458 /* 459 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs() 460 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv). 461 * In this case we just return as the ops vectors are already set up. 462 */ 463 if (zfs_dvnodeops) 464 return (0); 465 466 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template, 467 &zfs_dvnodeops); 468 if (error) 469 return (error); 470 471 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template, 472 &zfs_fvnodeops); 473 if (error) 474 return (error); 475 476 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template, 477 &zfs_symvnodeops); 478 if (error) 479 return (error); 480 481 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template, 482 &zfs_xdvnodeops); 483 if (error) 484 return (error); 485 486 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template, 487 &zfs_evnodeops); 488 if (error) 489 return (error); 490 491 error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template, 492 &zfs_sharevnodeops); 493 494 return (error); 495} 496#endif /* sun */ 497 498int 499zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx) 500{ 501 zfs_acl_ids_t acl_ids; 502 vattr_t vattr; 503 znode_t *sharezp; 504 vnode_t *vp, vnode; 505 znode_t *zp; 506 int error; 507 508 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 509 vattr.va_type = VDIR; 510 vattr.va_mode = S_IFDIR|0555; 511 vattr.va_uid = crgetuid(kcred); 512 vattr.va_gid = crgetgid(kcred); 513 514 sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP); 515 zfs_znode_cache_constructor(sharezp, zfsvfs->z_parent->z_vfs, 0); 516 ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs)); 517 sharezp->z_moved = 0; 518 sharezp->z_unlinked = 0; 519 sharezp->z_atime_dirty = 0; 520 sharezp->z_zfsvfs = zfsvfs; 521 sharezp->z_is_sa = zfsvfs->z_use_sa; 522 523 sharezp->z_vnode = &vnode; 524 vnode.v_data = sharezp; 525 526 vp = ZTOV(sharezp); 527 vp->v_type = VDIR; 528 529 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr, 530 kcred, NULL, &acl_ids)); 531 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids); 532 ASSERT3P(zp, ==, sharezp); 533 POINTER_INVALIDATE(&sharezp->z_zfsvfs); 534 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 535 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx); 536 zfsvfs->z_shares_dir = sharezp->z_id; 537 538 zfs_acl_ids_free(&acl_ids); 539 ZTOV(sharezp)->v_data = NULL; 540 ZTOV(sharezp)->v_count = 0; 541 ZTOV(sharezp)->v_holdcnt = 0; 542 zp->z_vnode = NULL; 543 sa_handle_destroy(sharezp->z_sa_hdl); 544 sharezp->z_vnode = NULL; 545 kmem_cache_free(znode_cache, sharezp); 546 547 return (error); 548} 549 550/* 551 * define a couple of values we need available 552 * for both 64 and 32 bit environments. 553 */ 554#ifndef NBITSMINOR64 555#define NBITSMINOR64 32 556#endif 557#ifndef MAXMAJ64 558#define MAXMAJ64 0xffffffffUL 559#endif 560#ifndef MAXMIN64 561#define MAXMIN64 0xffffffffUL 562#endif 563 564/* 565 * Create special expldev for ZFS private use. 566 * Can't use standard expldev since it doesn't do 567 * what we want. The standard expldev() takes a 568 * dev32_t in LP64 and expands it to a long dev_t. 569 * We need an interface that takes a dev32_t in ILP32 570 * and expands it to a long dev_t. 571 */ 572static uint64_t 573zfs_expldev(dev_t dev) 574{ 575 return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev)); 576} 577/* 578 * Special cmpldev for ZFS private use. 579 * Can't use standard cmpldev since it takes 580 * a long dev_t and compresses it to dev32_t in 581 * LP64. We need to do a compaction of a long dev_t 582 * to a dev32_t in ILP32. 583 */ 584dev_t 585zfs_cmpldev(uint64_t dev) 586{ 587 return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64))); 588} 589 590static void 591zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp, 592 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl) 593{ 594 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs)); 595 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id))); 596 597 mutex_enter(&zp->z_lock); 598 599 ASSERT(zp->z_sa_hdl == NULL); 600 ASSERT(zp->z_acl_cached == NULL); 601 if (sa_hdl == NULL) { 602 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp, 603 SA_HDL_SHARED, &zp->z_sa_hdl)); 604 } else { 605 zp->z_sa_hdl = sa_hdl; 606 sa_set_userp(sa_hdl, zp); 607 } 608 609 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE; 610 611 /* 612 * Slap on VROOT if we are the root znode 613 */ 614 if (zp->z_id == zfsvfs->z_root) 615 ZTOV(zp)->v_flag |= VROOT; 616 617 mutex_exit(&zp->z_lock); 618 vn_exists(ZTOV(zp)); 619} 620 621void 622zfs_znode_dmu_fini(znode_t *zp) 623{ 624 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) || 625 zp->z_unlinked || 626 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock)); 627 628 sa_handle_destroy(zp->z_sa_hdl); 629 zp->z_sa_hdl = NULL; 630} 631 632static void 633zfs_vnode_forget(vnode_t *vp) 634{ 635 636 VOP_UNLOCK(vp, 0); 637 VI_LOCK(vp); 638 vp->v_usecount--; 639 vp->v_iflag |= VI_DOOMED; 640 vp->v_data = NULL; 641 vdropl(vp); 642} 643 644/* 645 * Construct a new znode/vnode and intialize. 646 * 647 * This does not do a call to dmu_set_user() that is 648 * up to the caller to do, in case you don't want to 649 * return the znode 650 */ 651static znode_t * 652zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz, 653 dmu_object_type_t obj_type, sa_handle_t *hdl) 654{ 655 znode_t *zp; 656 vnode_t *vp; 657 uint64_t mode; 658 uint64_t parent; 659 sa_bulk_attr_t bulk[9]; 660 int count = 0; 661 662 zp = kmem_cache_alloc(znode_cache, KM_SLEEP); 663 zfs_znode_cache_constructor(zp, zfsvfs->z_parent->z_vfs, 0); 664 665 ASSERT(zp->z_dirlocks == NULL); 666 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 667 zp->z_moved = 0; 668 669 /* 670 * Defer setting z_zfsvfs until the znode is ready to be a candidate for 671 * the zfs_znode_move() callback. 672 */ 673 zp->z_sa_hdl = NULL; 674 zp->z_unlinked = 0; 675 zp->z_atime_dirty = 0; 676 zp->z_mapcnt = 0; 677 zp->z_id = db->db_object; 678 zp->z_blksz = blksz; 679 zp->z_seq = 0x7A4653; 680 zp->z_sync_cnt = 0; 681 682 vp = ZTOV(zp); 683 684 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl); 685 686 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8); 687 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8); 688 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 689 &zp->z_size, 8); 690 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 691 &zp->z_links, 8); 692 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 693 &zp->z_pflags, 8); 694 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8); 695 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 696 &zp->z_atime, 16); 697 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 698 &zp->z_uid, 8); 699 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 700 &zp->z_gid, 8); 701 702 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) { 703 if (hdl == NULL) 704 sa_handle_destroy(zp->z_sa_hdl); 705 zfs_vnode_forget(vp); 706 zp->z_vnode = NULL; 707 kmem_cache_free(znode_cache, zp); 708 return (NULL); 709 } 710 711 zp->z_mode = mode; 712 713 vp->v_type = IFTOVT((mode_t)mode); 714 715 switch (vp->v_type) { 716 case VDIR: 717 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ 718 break; 719#ifdef sun 720 case VBLK: 721 case VCHR: 722 { 723 uint64_t rdev; 724 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), 725 &rdev, sizeof (rdev)) == 0); 726 727 vp->v_rdev = zfs_cmpldev(rdev); 728 } 729 break; 730#endif /* sun */ 731 case VFIFO: 732#ifdef sun 733 case VSOCK: 734 case VDOOR: 735#endif /* sun */ 736 vp->v_op = &zfs_fifoops; 737 break; 738 case VREG: 739 if (parent == zfsvfs->z_shares_dir) { 740 ASSERT(zp->z_uid == 0 && zp->z_gid == 0); 741 vp->v_op = &zfs_shareops; 742 } 743 break; 744#ifdef sun 745 case VLNK: 746 vn_setops(vp, zfs_symvnodeops); 747 break; 748 default: 749 vn_setops(vp, zfs_evnodeops); 750 break; 751#endif /* sun */ 752 } 753 if (vp->v_type != VFIFO) 754 VN_LOCK_ASHARE(vp); 755 756 mutex_enter(&zfsvfs->z_znodes_lock); 757 list_insert_tail(&zfsvfs->z_all_znodes, zp); 758 membar_producer(); 759 /* 760 * Everything else must be valid before assigning z_zfsvfs makes the 761 * znode eligible for zfs_znode_move(). 762 */ 763 zp->z_zfsvfs = zfsvfs; 764 mutex_exit(&zfsvfs->z_znodes_lock); 765 766 VFS_HOLD(zfsvfs->z_vfs); 767 return (zp); 768} 769 770static uint64_t empty_xattr; 771static uint64_t pad[4]; 772static zfs_acl_phys_t acl_phys; 773/* 774 * Create a new DMU object to hold a zfs znode. 775 * 776 * IN: dzp - parent directory for new znode 777 * vap - file attributes for new znode 778 * tx - dmu transaction id for zap operations 779 * cr - credentials of caller 780 * flag - flags: 781 * IS_ROOT_NODE - new object will be root 782 * IS_XATTR - new object is an attribute 783 * bonuslen - length of bonus buffer 784 * setaclp - File/Dir initial ACL 785 * fuidp - Tracks fuid allocation. 786 * 787 * OUT: zpp - allocated znode 788 * 789 */ 790void 791zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 792 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids) 793{ 794 uint64_t crtime[2], atime[2], mtime[2], ctime[2]; 795 uint64_t mode, size, links, parent, pflags; 796 uint64_t dzp_pflags = 0; 797 uint64_t rdev = 0; 798 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 799 dmu_buf_t *db; 800 timestruc_t now; 801 uint64_t gen, obj; 802 int err; 803 int bonuslen; 804 sa_handle_t *sa_hdl; 805 dmu_object_type_t obj_type; 806 sa_bulk_attr_t sa_attrs[ZPL_END]; 807 int cnt = 0; 808 zfs_acl_locator_cb_t locate = { 0 }; 809 810 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); 811 812 if (zfsvfs->z_replay) { 813 obj = vap->va_nodeid; 814 now = vap->va_ctime; /* see zfs_replay_create() */ 815 gen = vap->va_nblocks; /* ditto */ 816 } else { 817 obj = 0; 818 gethrestime(&now); 819 gen = dmu_tx_get_txg(tx); 820 } 821 822 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE; 823 bonuslen = (obj_type == DMU_OT_SA) ? 824 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE; 825 826 /* 827 * Create a new DMU object. 828 */ 829 /* 830 * There's currently no mechanism for pre-reading the blocks that will 831 * be needed to allocate a new object, so we accept the small chance 832 * that there will be an i/o error and we will fail one of the 833 * assertions below. 834 */ 835 if (vap->va_type == VDIR) { 836 if (zfsvfs->z_replay) { 837 err = zap_create_claim_norm(zfsvfs->z_os, obj, 838 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 839 obj_type, bonuslen, tx); 840 ASSERT0(err); 841 } else { 842 obj = zap_create_norm(zfsvfs->z_os, 843 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 844 obj_type, bonuslen, tx); 845 } 846 } else { 847 if (zfsvfs->z_replay) { 848 err = dmu_object_claim(zfsvfs->z_os, obj, 849 DMU_OT_PLAIN_FILE_CONTENTS, 0, 850 obj_type, bonuslen, tx); 851 ASSERT0(err); 852 } else { 853 obj = dmu_object_alloc(zfsvfs->z_os, 854 DMU_OT_PLAIN_FILE_CONTENTS, 0, 855 obj_type, bonuslen, tx); 856 } 857 } 858 859 getnewvnode_reserve(1); 860 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 861 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db)); 862 863 /* 864 * If this is the root, fix up the half-initialized parent pointer 865 * to reference the just-allocated physical data area. 866 */ 867 if (flag & IS_ROOT_NODE) { 868 dzp->z_id = obj; 869 } else { 870 dzp_pflags = dzp->z_pflags; 871 } 872 873 /* 874 * If parent is an xattr, so am I. 875 */ 876 if (dzp_pflags & ZFS_XATTR) { 877 flag |= IS_XATTR; 878 } 879 880 if (zfsvfs->z_use_fuids) 881 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; 882 else 883 pflags = 0; 884 885 if (vap->va_type == VDIR) { 886 size = 2; /* contents ("." and "..") */ 887 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1; 888 } else { 889 size = links = 0; 890 } 891 892 if (vap->va_type == VBLK || vap->va_type == VCHR) { 893 rdev = zfs_expldev(vap->va_rdev); 894 } 895 896 parent = dzp->z_id; 897 mode = acl_ids->z_mode; 898 if (flag & IS_XATTR) 899 pflags |= ZFS_XATTR; 900 901 /* 902 * No execs denied will be deterimed when zfs_mode_compute() is called. 903 */ 904 pflags |= acl_ids->z_aclp->z_hints & 905 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT| 906 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED); 907 908 ZFS_TIME_ENCODE(&now, crtime); 909 ZFS_TIME_ENCODE(&now, ctime); 910 911 if (vap->va_mask & AT_ATIME) { 912 ZFS_TIME_ENCODE(&vap->va_atime, atime); 913 } else { 914 ZFS_TIME_ENCODE(&now, atime); 915 } 916 917 if (vap->va_mask & AT_MTIME) { 918 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 919 } else { 920 ZFS_TIME_ENCODE(&now, mtime); 921 } 922 923 /* Now add in all of the "SA" attributes */ 924 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED, 925 &sa_hdl)); 926 927 /* 928 * Setup the array of attributes to be replaced/set on the new file 929 * 930 * order for DMU_OT_ZNODE is critical since it needs to be constructed 931 * in the old znode_phys_t format. Don't change this ordering 932 */ 933 934 if (obj_type == DMU_OT_ZNODE) { 935 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 936 NULL, &atime, 16); 937 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 938 NULL, &mtime, 16); 939 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 940 NULL, &ctime, 16); 941 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 942 NULL, &crtime, 16); 943 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 944 NULL, &gen, 8); 945 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 946 NULL, &mode, 8); 947 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 948 NULL, &size, 8); 949 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 950 NULL, &parent, 8); 951 } else { 952 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 953 NULL, &mode, 8); 954 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 955 NULL, &size, 8); 956 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 957 NULL, &gen, 8); 958 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 959 &acl_ids->z_fuid, 8); 960 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 961 &acl_ids->z_fgid, 8); 962 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 963 NULL, &parent, 8); 964 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 965 NULL, &pflags, 8); 966 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 967 NULL, &atime, 16); 968 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 969 NULL, &mtime, 16); 970 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 971 NULL, &ctime, 16); 972 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 973 NULL, &crtime, 16); 974 } 975 976 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8); 977 978 if (obj_type == DMU_OT_ZNODE) { 979 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL, 980 &empty_xattr, 8); 981 } 982 if (obj_type == DMU_OT_ZNODE || 983 (vap->va_type == VBLK || vap->va_type == VCHR)) { 984 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs), 985 NULL, &rdev, 8); 986 987 } 988 if (obj_type == DMU_OT_ZNODE) { 989 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 990 NULL, &pflags, 8); 991 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 992 &acl_ids->z_fuid, 8); 993 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 994 &acl_ids->z_fgid, 8); 995 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad, 996 sizeof (uint64_t) * 4); 997 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL, 998 &acl_phys, sizeof (zfs_acl_phys_t)); 999 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) { 1000 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL, 1001 &acl_ids->z_aclp->z_acl_count, 8); 1002 locate.cb_aclp = acl_ids->z_aclp; 1003 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs), 1004 zfs_acl_data_locator, &locate, 1005 acl_ids->z_aclp->z_acl_bytes); 1006 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags, 1007 acl_ids->z_fuid, acl_ids->z_fgid); 1008 } 1009 1010 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0); 1011 1012 if (!(flag & IS_ROOT_NODE)) { 1013 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl); 1014 ASSERT(*zpp != NULL); 1015 } else { 1016 /* 1017 * If we are creating the root node, the "parent" we 1018 * passed in is the znode for the root. 1019 */ 1020 *zpp = dzp; 1021 1022 (*zpp)->z_sa_hdl = sa_hdl; 1023 } 1024 1025 (*zpp)->z_pflags = pflags; 1026 (*zpp)->z_mode = mode; 1027 1028 if (vap->va_mask & AT_XVATTR) 1029 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx); 1030 1031 if (obj_type == DMU_OT_ZNODE || 1032 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) { 1033 err = zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx); 1034 ASSERT0(err); 1035 } 1036 if (!(flag & IS_ROOT_NODE)) { 1037 vnode_t *vp; 1038 1039 vp = ZTOV(*zpp); 1040 vp->v_vflag |= VV_FORCEINSMQ; 1041 err = insmntque(vp, zfsvfs->z_vfs); 1042 vp->v_vflag &= ~VV_FORCEINSMQ; 1043 KASSERT(err == 0, ("insmntque() failed: error %d", err)); 1044 } 1045 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1046 getnewvnode_drop_reserve(); 1047} 1048 1049/* 1050 * zfs_xvattr_set only updates the in-core attributes 1051 * it is assumed the caller will be doing an sa_bulk_update 1052 * to push the changes out 1053 */ 1054void 1055zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx) 1056{ 1057 xoptattr_t *xoap; 1058 1059 xoap = xva_getxoptattr(xvap); 1060 ASSERT(xoap); 1061 1062 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 1063 uint64_t times[2]; 1064 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times); 1065 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs), 1066 ×, sizeof (times), tx); 1067 XVA_SET_RTN(xvap, XAT_CREATETIME); 1068 } 1069 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 1070 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly, 1071 zp->z_pflags, tx); 1072 XVA_SET_RTN(xvap, XAT_READONLY); 1073 } 1074 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 1075 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden, 1076 zp->z_pflags, tx); 1077 XVA_SET_RTN(xvap, XAT_HIDDEN); 1078 } 1079 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 1080 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system, 1081 zp->z_pflags, tx); 1082 XVA_SET_RTN(xvap, XAT_SYSTEM); 1083 } 1084 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 1085 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive, 1086 zp->z_pflags, tx); 1087 XVA_SET_RTN(xvap, XAT_ARCHIVE); 1088 } 1089 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 1090 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable, 1091 zp->z_pflags, tx); 1092 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 1093 } 1094 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 1095 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink, 1096 zp->z_pflags, tx); 1097 XVA_SET_RTN(xvap, XAT_NOUNLINK); 1098 } 1099 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 1100 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly, 1101 zp->z_pflags, tx); 1102 XVA_SET_RTN(xvap, XAT_APPENDONLY); 1103 } 1104 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 1105 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump, 1106 zp->z_pflags, tx); 1107 XVA_SET_RTN(xvap, XAT_NODUMP); 1108 } 1109 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 1110 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque, 1111 zp->z_pflags, tx); 1112 XVA_SET_RTN(xvap, XAT_OPAQUE); 1113 } 1114 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 1115 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED, 1116 xoap->xoa_av_quarantined, zp->z_pflags, tx); 1117 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 1118 } 1119 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 1120 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified, 1121 zp->z_pflags, tx); 1122 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 1123 } 1124 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { 1125 zfs_sa_set_scanstamp(zp, xvap, tx); 1126 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); 1127 } 1128 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 1129 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse, 1130 zp->z_pflags, tx); 1131 XVA_SET_RTN(xvap, XAT_REPARSE); 1132 } 1133 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 1134 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline, 1135 zp->z_pflags, tx); 1136 XVA_SET_RTN(xvap, XAT_OFFLINE); 1137 } 1138 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 1139 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse, 1140 zp->z_pflags, tx); 1141 XVA_SET_RTN(xvap, XAT_SPARSE); 1142 } 1143} 1144 1145int 1146zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 1147{ 1148 dmu_object_info_t doi; 1149 dmu_buf_t *db; 1150 znode_t *zp; 1151 int err; 1152 sa_handle_t *hdl; 1153 int first = 1; 1154 1155 *zpp = NULL; 1156 1157 getnewvnode_reserve(1); 1158again: 1159 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1160 1161 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1162 if (err) { 1163 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1164 getnewvnode_drop_reserve(); 1165 return (err); 1166 } 1167 1168 dmu_object_info_from_db(db, &doi); 1169 if (doi.doi_bonus_type != DMU_OT_SA && 1170 (doi.doi_bonus_type != DMU_OT_ZNODE || 1171 (doi.doi_bonus_type == DMU_OT_ZNODE && 1172 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1173 sa_buf_rele(db, NULL); 1174 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1175 getnewvnode_drop_reserve(); 1176 return (EINVAL); 1177 } 1178 1179 hdl = dmu_buf_get_user(db); 1180 if (hdl != NULL) { 1181 zp = sa_get_userdata(hdl); 1182 1183 1184 /* 1185 * Since "SA" does immediate eviction we 1186 * should never find a sa handle that doesn't 1187 * know about the znode. 1188 */ 1189 1190 ASSERT3P(zp, !=, NULL); 1191 1192 mutex_enter(&zp->z_lock); 1193 ASSERT3U(zp->z_id, ==, obj_num); 1194 if (zp->z_unlinked) { 1195 err = ENOENT; 1196 } else { 1197 vnode_t *vp; 1198 int dying = 0; 1199 1200 vp = ZTOV(zp); 1201 if (vp == NULL) 1202 dying = 1; 1203 else { 1204 VN_HOLD(vp); 1205 if ((vp->v_iflag & VI_DOOMED) != 0) { 1206 dying = 1; 1207 /* 1208 * Don't VN_RELE() vnode here, because 1209 * it can call vn_lock() which creates 1210 * LOR between vnode lock and znode 1211 * lock. We will VN_RELE() the vnode 1212 * after droping znode lock. 1213 */ 1214 } 1215 } 1216 if (dying) { 1217 if (first) { 1218 ZFS_LOG(1, "dying znode detected (zp=%p)", zp); 1219 first = 0; 1220 } 1221 /* 1222 * znode is dying so we can't reuse it, we must 1223 * wait until destruction is completed. 1224 */ 1225 sa_buf_rele(db, NULL); 1226 mutex_exit(&zp->z_lock); 1227 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1228 if (vp != NULL) 1229 VN_RELE(vp); 1230 tsleep(zp, 0, "zcollide", 1); 1231 goto again; 1232 } 1233 *zpp = zp; 1234 err = 0; 1235 } 1236 sa_buf_rele(db, NULL); 1237 mutex_exit(&zp->z_lock); 1238 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1239 getnewvnode_drop_reserve(); 1240 return (err); 1241 } 1242 1243 /* 1244 * Not found create new znode/vnode 1245 * but only if file exists. 1246 * 1247 * There is a small window where zfs_vget() could 1248 * find this object while a file create is still in 1249 * progress. This is checked for in zfs_znode_alloc() 1250 * 1251 * if zfs_znode_alloc() fails it will drop the hold on the 1252 * bonus buffer. 1253 */ 1254 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size, 1255 doi.doi_bonus_type, NULL); 1256 if (zp == NULL) { 1257 err = ENOENT; 1258 } else { 1259 *zpp = zp; 1260 } 1261 if (err == 0) { 1262 vnode_t *vp = ZTOV(zp); 1263 1264 err = insmntque(vp, zfsvfs->z_vfs); 1265 if (err == 0) 1266 VOP_UNLOCK(vp, 0); 1267 else { 1268 zp->z_vnode = NULL; 1269 zfs_znode_dmu_fini(zp); 1270 zfs_znode_free(zp); 1271 *zpp = NULL; 1272 } 1273 } 1274 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1275 getnewvnode_drop_reserve(); 1276 return (err); 1277} 1278 1279int 1280zfs_rezget(znode_t *zp) 1281{ 1282 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1283 dmu_object_info_t doi; 1284 dmu_buf_t *db; 1285 vnode_t *vp; 1286 uint64_t obj_num = zp->z_id; 1287 uint64_t mode, size; 1288 sa_bulk_attr_t bulk[8]; 1289 int err; 1290 int count = 0; 1291 uint64_t gen; 1292 1293 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1294 1295 mutex_enter(&zp->z_acl_lock); 1296 if (zp->z_acl_cached) { 1297 zfs_acl_free(zp->z_acl_cached); 1298 zp->z_acl_cached = NULL; 1299 } 1300 1301 mutex_exit(&zp->z_acl_lock); 1302 ASSERT(zp->z_sa_hdl == NULL); 1303 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1304 if (err) { 1305 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1306 return (err); 1307 } 1308 1309 dmu_object_info_from_db(db, &doi); 1310 if (doi.doi_bonus_type != DMU_OT_SA && 1311 (doi.doi_bonus_type != DMU_OT_ZNODE || 1312 (doi.doi_bonus_type == DMU_OT_ZNODE && 1313 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1314 sa_buf_rele(db, NULL); 1315 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1316 return (EINVAL); 1317 } 1318 1319 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL); 1320 size = zp->z_size; 1321 1322 /* reload cached values */ 1323 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, 1324 &gen, sizeof (gen)); 1325 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 1326 &zp->z_size, sizeof (zp->z_size)); 1327 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 1328 &zp->z_links, sizeof (zp->z_links)); 1329 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 1330 &zp->z_pflags, sizeof (zp->z_pflags)); 1331 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 1332 &zp->z_atime, sizeof (zp->z_atime)); 1333 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 1334 &zp->z_uid, sizeof (zp->z_uid)); 1335 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 1336 &zp->z_gid, sizeof (zp->z_gid)); 1337 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 1338 &mode, sizeof (mode)); 1339 1340 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) { 1341 zfs_znode_dmu_fini(zp); 1342 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1343 return (EIO); 1344 } 1345 1346 zp->z_mode = mode; 1347 1348 if (gen != zp->z_gen) { 1349 zfs_znode_dmu_fini(zp); 1350 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1351 return (EIO); 1352 } 1353 1354 /* 1355 * XXXPJD: Not sure how is that possible, but under heavy 1356 * zfs recv -F load it happens that z_gen is the same, but 1357 * vnode type is different than znode type. This would mean 1358 * that for example regular file was replaced with directory 1359 * which has the same object number. 1360 */ 1361 vp = ZTOV(zp); 1362 if (vp != NULL && 1363 vp->v_type != IFTOVT((mode_t)zp->z_mode)) { 1364 zfs_znode_dmu_fini(zp); 1365 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1366 return (EIO); 1367 } 1368 1369 zp->z_unlinked = (zp->z_links == 0); 1370 zp->z_blksz = doi.doi_data_block_size; 1371 if (vp != NULL) { 1372 vn_pages_remove(vp, 0, 0); 1373 if (zp->z_size != size) 1374 vnode_pager_setsize(vp, zp->z_size); 1375 } 1376 1377 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1378 1379 return (0); 1380} 1381 1382void 1383zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) 1384{ 1385 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1386 objset_t *os = zfsvfs->z_os; 1387 uint64_t obj = zp->z_id; 1388 uint64_t acl_obj = zfs_external_acl(zp); 1389 1390 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 1391 if (acl_obj) { 1392 VERIFY(!zp->z_is_sa); 1393 VERIFY(0 == dmu_object_free(os, acl_obj, tx)); 1394 } 1395 VERIFY(0 == dmu_object_free(os, obj, tx)); 1396 zfs_znode_dmu_fini(zp); 1397 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1398 zfs_znode_free(zp); 1399} 1400 1401void 1402zfs_zinactive(znode_t *zp) 1403{ 1404 vnode_t *vp = ZTOV(zp); 1405 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1406 uint64_t z_id = zp->z_id; 1407 int vfslocked; 1408 1409 ASSERT(zp->z_sa_hdl); 1410 1411 /* 1412 * Don't allow a zfs_zget() while were trying to release this znode 1413 */ 1414 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); 1415 1416 mutex_enter(&zp->z_lock); 1417 VI_LOCK(vp); 1418 if (vp->v_count > 0) { 1419 /* 1420 * If the hold count is greater than zero, somebody has 1421 * obtained a new reference on this znode while we were 1422 * processing it here, so we are done. 1423 */ 1424 VI_UNLOCK(vp); 1425 mutex_exit(&zp->z_lock); 1426 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1427 return; 1428 } 1429 VI_UNLOCK(vp); 1430 1431 /* 1432 * If this was the last reference to a file with no links, 1433 * remove the file from the file system. 1434 */ 1435 if (zp->z_unlinked) { 1436 mutex_exit(&zp->z_lock); 1437 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1438 ASSERT(vp->v_count == 0); 1439 vrecycle(vp); 1440 vfslocked = VFS_LOCK_GIANT(zfsvfs->z_vfs); 1441 zfs_rmnode(zp); 1442 VFS_UNLOCK_GIANT(vfslocked); 1443 return; 1444 } 1445 1446 mutex_exit(&zp->z_lock); 1447 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1448} 1449 1450void 1451zfs_znode_free(znode_t *zp) 1452{ 1453 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1454 1455 ASSERT(ZTOV(zp) == NULL); 1456 ASSERT(zp->z_sa_hdl == NULL); 1457 mutex_enter(&zfsvfs->z_znodes_lock); 1458 POINTER_INVALIDATE(&zp->z_zfsvfs); 1459 list_remove(&zfsvfs->z_all_znodes, zp); 1460 mutex_exit(&zfsvfs->z_znodes_lock); 1461 1462 if (zp->z_acl_cached) { 1463 zfs_acl_free(zp->z_acl_cached); 1464 zp->z_acl_cached = NULL; 1465 } 1466 1467 kmem_cache_free(znode_cache, zp); 1468 1469 VFS_RELE(zfsvfs->z_vfs); 1470} 1471 1472void 1473zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2], 1474 uint64_t ctime[2], boolean_t have_tx) 1475{ 1476 timestruc_t now; 1477 1478 gethrestime(&now); 1479 1480 if (have_tx) { /* will sa_bulk_update happen really soon? */ 1481 zp->z_atime_dirty = 0; 1482 zp->z_seq++; 1483 } else { 1484 zp->z_atime_dirty = 1; 1485 } 1486 1487 if (flag & AT_ATIME) { 1488 ZFS_TIME_ENCODE(&now, zp->z_atime); 1489 } 1490 1491 if (flag & AT_MTIME) { 1492 ZFS_TIME_ENCODE(&now, mtime); 1493 if (zp->z_zfsvfs->z_use_fuids) { 1494 zp->z_pflags |= (ZFS_ARCHIVE | 1495 ZFS_AV_MODIFIED); 1496 } 1497 } 1498 1499 if (flag & AT_CTIME) { 1500 ZFS_TIME_ENCODE(&now, ctime); 1501 if (zp->z_zfsvfs->z_use_fuids) 1502 zp->z_pflags |= ZFS_ARCHIVE; 1503 } 1504} 1505 1506/* 1507 * Grow the block size for a file. 1508 * 1509 * IN: zp - znode of file to free data in. 1510 * size - requested block size 1511 * tx - open transaction. 1512 * 1513 * NOTE: this function assumes that the znode is write locked. 1514 */ 1515void 1516zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx) 1517{ 1518 int error; 1519 u_longlong_t dummy; 1520 1521 if (size <= zp->z_blksz) 1522 return; 1523 /* 1524 * If the file size is already greater than the current blocksize, 1525 * we will not grow. If there is more than one block in a file, 1526 * the blocksize cannot change. 1527 */ 1528 if (zp->z_blksz && zp->z_size > zp->z_blksz) 1529 return; 1530 1531 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id, 1532 size, 0, tx); 1533 1534 if (error == ENOTSUP) 1535 return; 1536 ASSERT0(error); 1537 1538 /* What blocksize did we actually get? */ 1539 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy); 1540} 1541 1542#ifdef sun 1543/* 1544 * This is a dummy interface used when pvn_vplist_dirty() should *not* 1545 * be calling back into the fs for a putpage(). E.g.: when truncating 1546 * a file, the pages being "thrown away* don't need to be written out. 1547 */ 1548/* ARGSUSED */ 1549static int 1550zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, 1551 int flags, cred_t *cr) 1552{ 1553 ASSERT(0); 1554 return (0); 1555} 1556#endif /* sun */ 1557 1558/* 1559 * Increase the file length 1560 * 1561 * IN: zp - znode of file to free data in. 1562 * end - new end-of-file 1563 * 1564 * RETURN: 0 if success 1565 * error code if failure 1566 */ 1567static int 1568zfs_extend(znode_t *zp, uint64_t end) 1569{ 1570 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1571 dmu_tx_t *tx; 1572 rl_t *rl; 1573 uint64_t newblksz; 1574 int error; 1575 1576 /* 1577 * We will change zp_size, lock the whole file. 1578 */ 1579 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1580 1581 /* 1582 * Nothing to do if file already at desired length. 1583 */ 1584 if (end <= zp->z_size) { 1585 zfs_range_unlock(rl); 1586 return (0); 1587 } 1588top: 1589 tx = dmu_tx_create(zfsvfs->z_os); 1590 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1591 zfs_sa_upgrade_txholds(tx, zp); 1592 if (end > zp->z_blksz && 1593 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) { 1594 /* 1595 * We are growing the file past the current block size. 1596 */ 1597 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) { 1598 ASSERT(!ISP2(zp->z_blksz)); 1599 newblksz = MIN(end, SPA_MAXBLOCKSIZE); 1600 } else { 1601 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz); 1602 } 1603 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); 1604 } else { 1605 newblksz = 0; 1606 } 1607 1608 error = dmu_tx_assign(tx, TXG_NOWAIT); 1609 if (error) { 1610 if (error == ERESTART) { 1611 dmu_tx_wait(tx); 1612 dmu_tx_abort(tx); 1613 goto top; 1614 } 1615 dmu_tx_abort(tx); 1616 zfs_range_unlock(rl); 1617 return (error); 1618 } 1619 1620 if (newblksz) 1621 zfs_grow_blocksize(zp, newblksz, tx); 1622 1623 zp->z_size = end; 1624 1625 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs), 1626 &zp->z_size, sizeof (zp->z_size), tx)); 1627 1628 vnode_pager_setsize(ZTOV(zp), end); 1629 1630 zfs_range_unlock(rl); 1631 1632 dmu_tx_commit(tx); 1633 1634 return (0); 1635} 1636 1637/* 1638 * Free space in a file. 1639 * 1640 * IN: zp - znode of file to free data in. 1641 * off - start of section to free. 1642 * len - length of section to free. 1643 * 1644 * RETURN: 0 if success 1645 * error code if failure 1646 */ 1647static int 1648zfs_free_range(znode_t *zp, uint64_t off, uint64_t len) 1649{ 1650 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1651 rl_t *rl; 1652 int error; 1653 1654 /* 1655 * Lock the range being freed. 1656 */ 1657 rl = zfs_range_lock(zp, off, len, RL_WRITER); 1658 1659 /* 1660 * Nothing to do if file already at desired length. 1661 */ 1662 if (off >= zp->z_size) { 1663 zfs_range_unlock(rl); 1664 return (0); 1665 } 1666 1667 if (off + len > zp->z_size) 1668 len = zp->z_size - off; 1669 1670 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len); 1671 1672 if (error == 0) { 1673 /* 1674 * In FreeBSD we cannot free block in the middle of a file, 1675 * but only at the end of a file, so this code path should 1676 * never happen. 1677 */ 1678 vnode_pager_setsize(ZTOV(zp), off); 1679 } 1680 1681 zfs_range_unlock(rl); 1682 1683 return (error); 1684} 1685 1686/* 1687 * Truncate a file 1688 * 1689 * IN: zp - znode of file to free data in. 1690 * end - new end-of-file. 1691 * 1692 * RETURN: 0 if success 1693 * error code if failure 1694 */ 1695static int 1696zfs_trunc(znode_t *zp, uint64_t end) 1697{ 1698 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1699 vnode_t *vp = ZTOV(zp); 1700 dmu_tx_t *tx; 1701 rl_t *rl; 1702 int error; 1703 sa_bulk_attr_t bulk[2]; 1704 int count = 0; 1705 1706 /* 1707 * We will change zp_size, lock the whole file. 1708 */ 1709 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1710 1711 /* 1712 * Nothing to do if file already at desired length. 1713 */ 1714 if (end >= zp->z_size) { 1715 zfs_range_unlock(rl); 1716 return (0); 1717 } 1718 1719 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1); 1720 if (error) { 1721 zfs_range_unlock(rl); 1722 return (error); 1723 } 1724top: 1725 tx = dmu_tx_create(zfsvfs->z_os); 1726 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1727 zfs_sa_upgrade_txholds(tx, zp); 1728 error = dmu_tx_assign(tx, TXG_NOWAIT); 1729 if (error) { 1730 if (error == ERESTART) { 1731 dmu_tx_wait(tx); 1732 dmu_tx_abort(tx); 1733 goto top; 1734 } 1735 dmu_tx_abort(tx); 1736 zfs_range_unlock(rl); 1737 return (error); 1738 } 1739 1740 zp->z_size = end; 1741 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), 1742 NULL, &zp->z_size, sizeof (zp->z_size)); 1743 1744 if (end == 0) { 1745 zp->z_pflags &= ~ZFS_SPARSE; 1746 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1747 NULL, &zp->z_pflags, 8); 1748 } 1749 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0); 1750 1751 dmu_tx_commit(tx); 1752 1753 /* 1754 * Clear any mapped pages in the truncated region. This has to 1755 * happen outside of the transaction to avoid the possibility of 1756 * a deadlock with someone trying to push a page that we are 1757 * about to invalidate. 1758 */ 1759 vnode_pager_setsize(vp, end); 1760 1761 zfs_range_unlock(rl); 1762 1763 return (0); 1764} 1765 1766/* 1767 * Free space in a file 1768 * 1769 * IN: zp - znode of file to free data in. 1770 * off - start of range 1771 * len - end of range (0 => EOF) 1772 * flag - current file open mode flags. 1773 * log - TRUE if this action should be logged 1774 * 1775 * RETURN: 0 if success 1776 * error code if failure 1777 */ 1778int 1779zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) 1780{ 1781 vnode_t *vp = ZTOV(zp); 1782 dmu_tx_t *tx; 1783 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1784 zilog_t *zilog = zfsvfs->z_log; 1785 uint64_t mode; 1786 uint64_t mtime[2], ctime[2]; 1787 sa_bulk_attr_t bulk[3]; 1788 int count = 0; 1789 int error; 1790 1791 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode, 1792 sizeof (mode))) != 0) 1793 return (error); 1794 1795 if (off > zp->z_size) { 1796 error = zfs_extend(zp, off+len); 1797 if (error == 0 && log) 1798 goto log; 1799 else 1800 return (error); 1801 } 1802 1803 /* 1804 * Check for any locks in the region to be freed. 1805 */ 1806 1807 if (MANDLOCK(vp, (mode_t)mode)) { 1808 uint64_t length = (len ? len : zp->z_size - off); 1809 if (error = chklock(vp, FWRITE, off, length, flag, NULL)) 1810 return (error); 1811 } 1812 1813 if (len == 0) { 1814 error = zfs_trunc(zp, off); 1815 } else { 1816 if ((error = zfs_free_range(zp, off, len)) == 0 && 1817 off + len > zp->z_size) 1818 error = zfs_extend(zp, off+len); 1819 } 1820 if (error || !log) 1821 return (error); 1822log: 1823 tx = dmu_tx_create(zfsvfs->z_os); 1824 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1825 zfs_sa_upgrade_txholds(tx, zp); 1826 error = dmu_tx_assign(tx, TXG_NOWAIT); 1827 if (error) { 1828 if (error == ERESTART) { 1829 dmu_tx_wait(tx); 1830 dmu_tx_abort(tx); 1831 goto log; 1832 } 1833 dmu_tx_abort(tx); 1834 return (error); 1835 } 1836 1837 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16); 1838 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16); 1839 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1840 NULL, &zp->z_pflags, 8); 1841 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); 1842 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 1843 ASSERT(error == 0); 1844 1845 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); 1846 1847 dmu_tx_commit(tx); 1848 return (0); 1849} 1850 1851void 1852zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) 1853{ 1854 zfsvfs_t zfsvfs; 1855 uint64_t moid, obj, sa_obj, version; 1856 uint64_t sense = ZFS_CASE_SENSITIVE; 1857 uint64_t norm = 0; 1858 nvpair_t *elem; 1859 int error; 1860 int i; 1861 znode_t *rootzp = NULL; 1862 vnode_t vnode; 1863 vattr_t vattr; 1864 znode_t *zp; 1865 zfs_acl_ids_t acl_ids; 1866 1867 /* 1868 * First attempt to create master node. 1869 */ 1870 /* 1871 * In an empty objset, there are no blocks to read and thus 1872 * there can be no i/o errors (which we assert below). 1873 */ 1874 moid = MASTER_NODE_OBJ; 1875 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE, 1876 DMU_OT_NONE, 0, tx); 1877 ASSERT(error == 0); 1878 1879 /* 1880 * Set starting attributes. 1881 */ 1882 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os))); 1883 elem = NULL; 1884 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) { 1885 /* For the moment we expect all zpl props to be uint64_ts */ 1886 uint64_t val; 1887 char *name; 1888 1889 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64); 1890 VERIFY(nvpair_value_uint64(elem, &val) == 0); 1891 name = nvpair_name(elem); 1892 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) { 1893 if (val < version) 1894 version = val; 1895 } else { 1896 error = zap_update(os, moid, name, 8, 1, &val, tx); 1897 } 1898 ASSERT(error == 0); 1899 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0) 1900 norm = val; 1901 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0) 1902 sense = val; 1903 } 1904 ASSERT(version != 0); 1905 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx); 1906 1907 /* 1908 * Create zap object used for SA attribute registration 1909 */ 1910 1911 if (version >= ZPL_VERSION_SA) { 1912 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 1913 DMU_OT_NONE, 0, tx); 1914 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 1915 ASSERT(error == 0); 1916 } else { 1917 sa_obj = 0; 1918 } 1919 /* 1920 * Create a delete queue. 1921 */ 1922 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); 1923 1924 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx); 1925 ASSERT(error == 0); 1926 1927 /* 1928 * Create root znode. Create minimal znode/vnode/zfsvfs 1929 * to allow zfs_mknode to work. 1930 */ 1931 VATTR_NULL(&vattr); 1932 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 1933 vattr.va_type = VDIR; 1934 vattr.va_mode = S_IFDIR|0755; 1935 vattr.va_uid = crgetuid(cr); 1936 vattr.va_gid = crgetgid(cr); 1937 1938 bzero(&zfsvfs, sizeof (zfsvfs_t)); 1939 1940 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP); 1941 zfs_znode_cache_constructor(rootzp, NULL, 0); 1942 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs)); 1943 rootzp->z_moved = 0; 1944 rootzp->z_unlinked = 0; 1945 rootzp->z_atime_dirty = 0; 1946 rootzp->z_is_sa = USE_SA(version, os); 1947 1948 vnode.v_type = VDIR; 1949 vnode.v_data = rootzp; 1950 rootzp->z_vnode = &vnode; 1951 1952 zfsvfs.z_os = os; 1953 zfsvfs.z_parent = &zfsvfs; 1954 zfsvfs.z_version = version; 1955 zfsvfs.z_use_fuids = USE_FUIDS(version, os); 1956 zfsvfs.z_use_sa = USE_SA(version, os); 1957 zfsvfs.z_norm = norm; 1958 1959 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 1960 &zfsvfs.z_attr_table); 1961 1962 ASSERT(error == 0); 1963 1964 /* 1965 * Fold case on file systems that are always or sometimes case 1966 * insensitive. 1967 */ 1968 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED) 1969 zfsvfs.z_norm |= U8_TEXTPREP_TOUPPER; 1970 1971 mutex_init(&zfsvfs.z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 1972 list_create(&zfsvfs.z_all_znodes, sizeof (znode_t), 1973 offsetof(znode_t, z_link_node)); 1974 1975 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1976 mutex_init(&zfsvfs.z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 1977 1978 rootzp->z_zfsvfs = &zfsvfs; 1979 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr, 1980 cr, NULL, &acl_ids)); 1981 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids); 1982 ASSERT3P(zp, ==, rootzp); 1983 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); 1984 ASSERT(error == 0); 1985 zfs_acl_ids_free(&acl_ids); 1986 POINTER_INVALIDATE(&rootzp->z_zfsvfs); 1987 1988 sa_handle_destroy(rootzp->z_sa_hdl); 1989 rootzp->z_vnode = NULL; 1990 kmem_cache_free(znode_cache, rootzp); 1991 1992 /* 1993 * Create shares directory 1994 */ 1995 1996 error = zfs_create_share_dir(&zfsvfs, tx); 1997 1998 ASSERT(error == 0); 1999 2000 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 2001 mutex_destroy(&zfsvfs.z_hold_mtx[i]); 2002} 2003 2004#endif /* _KERNEL */ 2005 2006static int 2007zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table) 2008{ 2009 uint64_t sa_obj = 0; 2010 int error; 2011 2012 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj); 2013 if (error != 0 && error != ENOENT) 2014 return (error); 2015 2016 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table); 2017 return (error); 2018} 2019 2020static int 2021zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp, 2022 dmu_buf_t **db, void *tag) 2023{ 2024 dmu_object_info_t doi; 2025 int error; 2026 2027 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0) 2028 return (error); 2029 2030 dmu_object_info_from_db(*db, &doi); 2031 if ((doi.doi_bonus_type != DMU_OT_SA && 2032 doi.doi_bonus_type != DMU_OT_ZNODE) || 2033 doi.doi_bonus_type == DMU_OT_ZNODE && 2034 doi.doi_bonus_size < sizeof (znode_phys_t)) { 2035 sa_buf_rele(*db, tag); 2036 return (ENOTSUP); 2037 } 2038 2039 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp); 2040 if (error != 0) { 2041 sa_buf_rele(*db, tag); 2042 return (error); 2043 } 2044 2045 return (0); 2046} 2047 2048void 2049zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag) 2050{ 2051 sa_handle_destroy(hdl); 2052 sa_buf_rele(db, tag); 2053} 2054 2055/* 2056 * Given an object number, return its parent object number and whether 2057 * or not the object is an extended attribute directory. 2058 */ 2059static int 2060zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table, 2061 uint64_t *pobjp, int *is_xattrdir) 2062{ 2063 uint64_t parent; 2064 uint64_t pflags; 2065 uint64_t mode; 2066 uint64_t parent_mode; 2067 sa_bulk_attr_t bulk[3]; 2068 sa_handle_t *sa_hdl; 2069 dmu_buf_t *sa_db; 2070 int count = 0; 2071 int error; 2072 2073 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL, 2074 &parent, sizeof (parent)); 2075 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL, 2076 &pflags, sizeof (pflags)); 2077 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2078 &mode, sizeof (mode)); 2079 2080 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0) 2081 return (error); 2082 2083 /* 2084 * When a link is removed its parent pointer is not changed and will 2085 * be invalid. There are two cases where a link is removed but the 2086 * file stays around, when it goes to the delete queue and when there 2087 * are additional links. 2088 */ 2089 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG); 2090 if (error != 0) 2091 return (error); 2092 2093 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode)); 2094 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2095 if (error != 0) 2096 return (error); 2097 2098 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode); 2099 2100 /* 2101 * Extended attributes can be applied to files, directories, etc. 2102 * Otherwise the parent must be a directory. 2103 */ 2104 if (!*is_xattrdir && !S_ISDIR(parent_mode)) 2105 return (EINVAL); 2106 2107 *pobjp = parent; 2108 2109 return (0); 2110} 2111 2112/* 2113 * Given an object number, return some zpl level statistics 2114 */ 2115static int 2116zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table, 2117 zfs_stat_t *sb) 2118{ 2119 sa_bulk_attr_t bulk[4]; 2120 int count = 0; 2121 2122 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2123 &sb->zs_mode, sizeof (sb->zs_mode)); 2124 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL, 2125 &sb->zs_gen, sizeof (sb->zs_gen)); 2126 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL, 2127 &sb->zs_links, sizeof (sb->zs_links)); 2128 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL, 2129 &sb->zs_ctime, sizeof (sb->zs_ctime)); 2130 2131 return (sa_bulk_lookup(hdl, bulk, count)); 2132} 2133 2134static int 2135zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl, 2136 sa_attr_type_t *sa_table, char *buf, int len) 2137{ 2138 sa_handle_t *sa_hdl; 2139 sa_handle_t *prevhdl = NULL; 2140 dmu_buf_t *prevdb = NULL; 2141 dmu_buf_t *sa_db = NULL; 2142 char *path = buf + len - 1; 2143 int error; 2144 2145 *path = '\0'; 2146 sa_hdl = hdl; 2147 2148 for (;;) { 2149 uint64_t pobj; 2150 char component[MAXNAMELEN + 2]; 2151 size_t complen; 2152 int is_xattrdir; 2153 2154 if (prevdb) 2155 zfs_release_sa_handle(prevhdl, prevdb, FTAG); 2156 2157 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj, 2158 &is_xattrdir)) != 0) 2159 break; 2160 2161 if (pobj == obj) { 2162 if (path[0] != '/') 2163 *--path = '/'; 2164 break; 2165 } 2166 2167 component[0] = '/'; 2168 if (is_xattrdir) { 2169 (void) sprintf(component + 1, "<xattrdir>"); 2170 } else { 2171 error = zap_value_search(osp, pobj, obj, 2172 ZFS_DIRENT_OBJ(-1ULL), component + 1); 2173 if (error != 0) 2174 break; 2175 } 2176 2177 complen = strlen(component); 2178 path -= complen; 2179 ASSERT(path >= buf); 2180 bcopy(component, path, complen); 2181 obj = pobj; 2182 2183 if (sa_hdl != hdl) { 2184 prevhdl = sa_hdl; 2185 prevdb = sa_db; 2186 } 2187 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG); 2188 if (error != 0) { 2189 sa_hdl = prevhdl; 2190 sa_db = prevdb; 2191 break; 2192 } 2193 } 2194 2195 if (sa_hdl != NULL && sa_hdl != hdl) { 2196 ASSERT(sa_db != NULL); 2197 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2198 } 2199 2200 if (error == 0) 2201 (void) memmove(buf, path, buf + len - path); 2202 2203 return (error); 2204} 2205 2206int 2207zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) 2208{ 2209 sa_attr_type_t *sa_table; 2210 sa_handle_t *hdl; 2211 dmu_buf_t *db; 2212 int error; 2213 2214 error = zfs_sa_setup(osp, &sa_table); 2215 if (error != 0) 2216 return (error); 2217 2218 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2219 if (error != 0) 2220 return (error); 2221 2222 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2223 2224 zfs_release_sa_handle(hdl, db, FTAG); 2225 return (error); 2226} 2227 2228int 2229zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb, 2230 char *buf, int len) 2231{ 2232 char *path = buf + len - 1; 2233 sa_attr_type_t *sa_table; 2234 sa_handle_t *hdl; 2235 dmu_buf_t *db; 2236 int error; 2237 2238 *path = '\0'; 2239 2240 error = zfs_sa_setup(osp, &sa_table); 2241 if (error != 0) 2242 return (error); 2243 2244 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2245 if (error != 0) 2246 return (error); 2247 2248 error = zfs_obj_to_stats_impl(hdl, sa_table, sb); 2249 if (error != 0) { 2250 zfs_release_sa_handle(hdl, db, FTAG); 2251 return (error); 2252 } 2253 2254 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2255 2256 zfs_release_sa_handle(hdl, db, FTAG); 2257 return (error); 2258} 2259