zfs_znode.c revision 297112
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#endif /* _KERNEL */ 56 57#include <sys/dmu.h> 58#include <sys/dmu_objset.h> 59#include <sys/refcount.h> 60#include <sys/stat.h> 61#include <sys/zap.h> 62#include <sys/zfs_znode.h> 63#include <sys/sa.h> 64#include <sys/zfs_sa.h> 65#include <sys/zfs_stat.h> 66#include <sys/refcount.h> 67 68#include "zfs_prop.h" 69#include "zfs_comutil.h" 70 71/* Used by fstat(1). */ 72SYSCTL_INT(_debug_sizeof, OID_AUTO, znode, CTLFLAG_RD, 73 SYSCTL_NULL_INT_PTR, sizeof(znode_t), "sizeof(znode_t)"); 74 75/* 76 * Define ZNODE_STATS to turn on statistic gathering. By default, it is only 77 * turned on when DEBUG is also defined. 78 */ 79#ifdef DEBUG 80#define ZNODE_STATS 81#endif /* DEBUG */ 82 83#ifdef ZNODE_STATS 84#define ZNODE_STAT_ADD(stat) ((stat)++) 85#else 86#define ZNODE_STAT_ADD(stat) /* nothing */ 87#endif /* ZNODE_STATS */ 88 89/* 90 * Functions needed for userland (ie: libzpool) are not put under 91 * #ifdef_KERNEL; the rest of the functions have dependencies 92 * (such as VFS logic) that will not compile easily in userland. 93 */ 94#ifdef _KERNEL 95/* 96 * Needed to close a small window in zfs_znode_move() that allows the zfsvfs to 97 * be freed before it can be safely accessed. 98 */ 99krwlock_t zfsvfs_lock; 100 101static kmem_cache_t *znode_cache = NULL; 102 103/*ARGSUSED*/ 104static void 105znode_evict_error(dmu_buf_t *dbuf, void *user_ptr) 106{ 107 /* 108 * We should never drop all dbuf refs without first clearing 109 * the eviction callback. 110 */ 111 panic("evicting znode %p\n", user_ptr); 112} 113 114extern struct vop_vector zfs_vnodeops; 115extern struct vop_vector zfs_fifoops; 116extern struct vop_vector zfs_shareops; 117 118static int 119zfs_znode_cache_constructor(void *buf, void *arg, int kmflags) 120{ 121 znode_t *zp = buf; 122 123 POINTER_INVALIDATE(&zp->z_zfsvfs); 124 125 list_link_init(&zp->z_link_node); 126 127 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL); 128 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL); 129 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL); 130 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL); 131 132 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL); 133 avl_create(&zp->z_range_avl, zfs_range_compare, 134 sizeof (rl_t), offsetof(rl_t, r_node)); 135 136 zp->z_dirlocks = NULL; 137 zp->z_acl_cached = NULL; 138 zp->z_vnode = NULL; 139 zp->z_moved = 0; 140 return (0); 141} 142 143/*ARGSUSED*/ 144static void 145zfs_znode_cache_destructor(void *buf, void *arg) 146{ 147 znode_t *zp = buf; 148 149 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 150 ASSERT(ZTOV(zp) == NULL); 151 vn_free(ZTOV(zp)); 152 ASSERT(!list_link_active(&zp->z_link_node)); 153 mutex_destroy(&zp->z_lock); 154 rw_destroy(&zp->z_parent_lock); 155 rw_destroy(&zp->z_name_lock); 156 mutex_destroy(&zp->z_acl_lock); 157 avl_destroy(&zp->z_range_avl); 158 mutex_destroy(&zp->z_range_lock); 159 160 ASSERT(zp->z_dirlocks == NULL); 161 ASSERT(zp->z_acl_cached == NULL); 162} 163 164#ifdef ZNODE_STATS 165static struct { 166 uint64_t zms_zfsvfs_invalid; 167 uint64_t zms_zfsvfs_recheck1; 168 uint64_t zms_zfsvfs_unmounted; 169 uint64_t zms_zfsvfs_recheck2; 170 uint64_t zms_obj_held; 171 uint64_t zms_vnode_locked; 172 uint64_t zms_not_only_dnlc; 173} znode_move_stats; 174#endif /* ZNODE_STATS */ 175 176#ifdef illumos 177static void 178zfs_znode_move_impl(znode_t *ozp, znode_t *nzp) 179{ 180 vnode_t *vp; 181 182 /* Copy fields. */ 183 nzp->z_zfsvfs = ozp->z_zfsvfs; 184 185 /* Swap vnodes. */ 186 vp = nzp->z_vnode; 187 nzp->z_vnode = ozp->z_vnode; 188 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */ 189 ZTOV(ozp)->v_data = ozp; 190 ZTOV(nzp)->v_data = nzp; 191 192 nzp->z_id = ozp->z_id; 193 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */ 194 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0); 195 nzp->z_unlinked = ozp->z_unlinked; 196 nzp->z_atime_dirty = ozp->z_atime_dirty; 197 nzp->z_zn_prefetch = ozp->z_zn_prefetch; 198 nzp->z_blksz = ozp->z_blksz; 199 nzp->z_seq = ozp->z_seq; 200 nzp->z_mapcnt = ozp->z_mapcnt; 201 nzp->z_gen = ozp->z_gen; 202 nzp->z_sync_cnt = ozp->z_sync_cnt; 203 nzp->z_is_sa = ozp->z_is_sa; 204 nzp->z_sa_hdl = ozp->z_sa_hdl; 205 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2); 206 nzp->z_links = ozp->z_links; 207 nzp->z_size = ozp->z_size; 208 nzp->z_pflags = ozp->z_pflags; 209 nzp->z_uid = ozp->z_uid; 210 nzp->z_gid = ozp->z_gid; 211 nzp->z_mode = ozp->z_mode; 212 213 /* 214 * Since this is just an idle znode and kmem is already dealing with 215 * memory pressure, release any cached ACL. 216 */ 217 if (ozp->z_acl_cached) { 218 zfs_acl_free(ozp->z_acl_cached); 219 ozp->z_acl_cached = NULL; 220 } 221 222 sa_set_userp(nzp->z_sa_hdl, nzp); 223 224 /* 225 * Invalidate the original znode by clearing fields that provide a 226 * pointer back to the znode. Set the low bit of the vfs pointer to 227 * ensure that zfs_znode_move() recognizes the znode as invalid in any 228 * subsequent callback. 229 */ 230 ozp->z_sa_hdl = NULL; 231 POINTER_INVALIDATE(&ozp->z_zfsvfs); 232 233 /* 234 * Mark the znode. 235 */ 236 nzp->z_moved = 1; 237 ozp->z_moved = (uint8_t)-1; 238} 239 240/*ARGSUSED*/ 241static kmem_cbrc_t 242zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg) 243{ 244 znode_t *ozp = buf, *nzp = newbuf; 245 zfsvfs_t *zfsvfs; 246 vnode_t *vp; 247 248 /* 249 * The znode is on the file system's list of known znodes if the vfs 250 * pointer is valid. We set the low bit of the vfs pointer when freeing 251 * the znode to invalidate it, and the memory patterns written by kmem 252 * (baddcafe and deadbeef) set at least one of the two low bits. A newly 253 * created znode sets the vfs pointer last of all to indicate that the 254 * znode is known and in a valid state to be moved by this function. 255 */ 256 zfsvfs = ozp->z_zfsvfs; 257 if (!POINTER_IS_VALID(zfsvfs)) { 258 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid); 259 return (KMEM_CBRC_DONT_KNOW); 260 } 261 262 /* 263 * Close a small window in which it's possible that the filesystem could 264 * be unmounted and freed, and zfsvfs, though valid in the previous 265 * statement, could point to unrelated memory by the time we try to 266 * prevent the filesystem from being unmounted. 267 */ 268 rw_enter(&zfsvfs_lock, RW_WRITER); 269 if (zfsvfs != ozp->z_zfsvfs) { 270 rw_exit(&zfsvfs_lock); 271 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1); 272 return (KMEM_CBRC_DONT_KNOW); 273 } 274 275 /* 276 * If the znode is still valid, then so is the file system. We know that 277 * no valid file system can be freed while we hold zfsvfs_lock, so we 278 * can safely ensure that the filesystem is not and will not be 279 * unmounted. The next statement is equivalent to ZFS_ENTER(). 280 */ 281 rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG); 282 if (zfsvfs->z_unmounted) { 283 ZFS_EXIT(zfsvfs); 284 rw_exit(&zfsvfs_lock); 285 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted); 286 return (KMEM_CBRC_DONT_KNOW); 287 } 288 rw_exit(&zfsvfs_lock); 289 290 mutex_enter(&zfsvfs->z_znodes_lock); 291 /* 292 * Recheck the vfs pointer in case the znode was removed just before 293 * acquiring the lock. 294 */ 295 if (zfsvfs != ozp->z_zfsvfs) { 296 mutex_exit(&zfsvfs->z_znodes_lock); 297 ZFS_EXIT(zfsvfs); 298 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2); 299 return (KMEM_CBRC_DONT_KNOW); 300 } 301 302 /* 303 * At this point we know that as long as we hold z_znodes_lock, the 304 * znode cannot be freed and fields within the znode can be safely 305 * accessed. Now, prevent a race with zfs_zget(). 306 */ 307 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) { 308 mutex_exit(&zfsvfs->z_znodes_lock); 309 ZFS_EXIT(zfsvfs); 310 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held); 311 return (KMEM_CBRC_LATER); 312 } 313 314 vp = ZTOV(ozp); 315 if (mutex_tryenter(&vp->v_lock) == 0) { 316 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 317 mutex_exit(&zfsvfs->z_znodes_lock); 318 ZFS_EXIT(zfsvfs); 319 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked); 320 return (KMEM_CBRC_LATER); 321 } 322 323 /* Only move znodes that are referenced _only_ by the DNLC. */ 324 if (vp->v_count != 1 || !vn_in_dnlc(vp)) { 325 mutex_exit(&vp->v_lock); 326 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 327 mutex_exit(&zfsvfs->z_znodes_lock); 328 ZFS_EXIT(zfsvfs); 329 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc); 330 return (KMEM_CBRC_LATER); 331 } 332 333 /* 334 * The znode is known and in a valid state to move. We're holding the 335 * locks needed to execute the critical section. 336 */ 337 zfs_znode_move_impl(ozp, nzp); 338 mutex_exit(&vp->v_lock); 339 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 340 341 list_link_replace(&ozp->z_link_node, &nzp->z_link_node); 342 mutex_exit(&zfsvfs->z_znodes_lock); 343 ZFS_EXIT(zfsvfs); 344 345 return (KMEM_CBRC_YES); 346} 347#endif /* illumos */ 348 349void 350zfs_znode_init(void) 351{ 352 /* 353 * Initialize zcache 354 */ 355 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL); 356 ASSERT(znode_cache == NULL); 357 znode_cache = kmem_cache_create("zfs_znode_cache", 358 sizeof (znode_t), 0, zfs_znode_cache_constructor, 359 zfs_znode_cache_destructor, NULL, NULL, NULL, 0); 360 kmem_cache_set_move(znode_cache, zfs_znode_move); 361} 362 363void 364zfs_znode_fini(void) 365{ 366#ifdef illumos 367 /* 368 * Cleanup vfs & vnode ops 369 */ 370 zfs_remove_op_tables(); 371#endif 372 373 /* 374 * Cleanup zcache 375 */ 376 if (znode_cache) 377 kmem_cache_destroy(znode_cache); 378 znode_cache = NULL; 379 rw_destroy(&zfsvfs_lock); 380} 381 382#ifdef illumos 383struct vnodeops *zfs_dvnodeops; 384struct vnodeops *zfs_fvnodeops; 385struct vnodeops *zfs_symvnodeops; 386struct vnodeops *zfs_xdvnodeops; 387struct vnodeops *zfs_evnodeops; 388struct vnodeops *zfs_sharevnodeops; 389 390void 391zfs_remove_op_tables() 392{ 393 /* 394 * Remove vfs ops 395 */ 396 ASSERT(zfsfstype); 397 (void) vfs_freevfsops_by_type(zfsfstype); 398 zfsfstype = 0; 399 400 /* 401 * Remove vnode ops 402 */ 403 if (zfs_dvnodeops) 404 vn_freevnodeops(zfs_dvnodeops); 405 if (zfs_fvnodeops) 406 vn_freevnodeops(zfs_fvnodeops); 407 if (zfs_symvnodeops) 408 vn_freevnodeops(zfs_symvnodeops); 409 if (zfs_xdvnodeops) 410 vn_freevnodeops(zfs_xdvnodeops); 411 if (zfs_evnodeops) 412 vn_freevnodeops(zfs_evnodeops); 413 if (zfs_sharevnodeops) 414 vn_freevnodeops(zfs_sharevnodeops); 415 416 zfs_dvnodeops = NULL; 417 zfs_fvnodeops = NULL; 418 zfs_symvnodeops = NULL; 419 zfs_xdvnodeops = NULL; 420 zfs_evnodeops = NULL; 421 zfs_sharevnodeops = NULL; 422} 423 424extern const fs_operation_def_t zfs_dvnodeops_template[]; 425extern const fs_operation_def_t zfs_fvnodeops_template[]; 426extern const fs_operation_def_t zfs_xdvnodeops_template[]; 427extern const fs_operation_def_t zfs_symvnodeops_template[]; 428extern const fs_operation_def_t zfs_evnodeops_template[]; 429extern const fs_operation_def_t zfs_sharevnodeops_template[]; 430 431int 432zfs_create_op_tables() 433{ 434 int error; 435 436 /* 437 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs() 438 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv). 439 * In this case we just return as the ops vectors are already set up. 440 */ 441 if (zfs_dvnodeops) 442 return (0); 443 444 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template, 445 &zfs_dvnodeops); 446 if (error) 447 return (error); 448 449 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template, 450 &zfs_fvnodeops); 451 if (error) 452 return (error); 453 454 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template, 455 &zfs_symvnodeops); 456 if (error) 457 return (error); 458 459 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template, 460 &zfs_xdvnodeops); 461 if (error) 462 return (error); 463 464 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template, 465 &zfs_evnodeops); 466 if (error) 467 return (error); 468 469 error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template, 470 &zfs_sharevnodeops); 471 472 return (error); 473} 474#endif /* illumos */ 475 476int 477zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx) 478{ 479 zfs_acl_ids_t acl_ids; 480 vattr_t vattr; 481 znode_t *sharezp; 482 znode_t *zp; 483 int error; 484 485 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 486 vattr.va_type = VDIR; 487 vattr.va_mode = S_IFDIR|0555; 488 vattr.va_uid = crgetuid(kcred); 489 vattr.va_gid = crgetgid(kcred); 490 491 sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP); 492 ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs)); 493 sharezp->z_moved = 0; 494 sharezp->z_unlinked = 0; 495 sharezp->z_atime_dirty = 0; 496 sharezp->z_zfsvfs = zfsvfs; 497 sharezp->z_is_sa = zfsvfs->z_use_sa; 498 499 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr, 500 kcred, NULL, &acl_ids)); 501 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids); 502 ASSERT3P(zp, ==, sharezp); 503 POINTER_INVALIDATE(&sharezp->z_zfsvfs); 504 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 505 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx); 506 zfsvfs->z_shares_dir = sharezp->z_id; 507 508 zfs_acl_ids_free(&acl_ids); 509 sa_handle_destroy(sharezp->z_sa_hdl); 510 kmem_cache_free(znode_cache, sharezp); 511 512 return (error); 513} 514 515/* 516 * define a couple of values we need available 517 * for both 64 and 32 bit environments. 518 */ 519#ifndef NBITSMINOR64 520#define NBITSMINOR64 32 521#endif 522#ifndef MAXMAJ64 523#define MAXMAJ64 0xffffffffUL 524#endif 525#ifndef MAXMIN64 526#define MAXMIN64 0xffffffffUL 527#endif 528 529/* 530 * Create special expldev for ZFS private use. 531 * Can't use standard expldev since it doesn't do 532 * what we want. The standard expldev() takes a 533 * dev32_t in LP64 and expands it to a long dev_t. 534 * We need an interface that takes a dev32_t in ILP32 535 * and expands it to a long dev_t. 536 */ 537static uint64_t 538zfs_expldev(dev_t dev) 539{ 540 return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev)); 541} 542/* 543 * Special cmpldev for ZFS private use. 544 * Can't use standard cmpldev since it takes 545 * a long dev_t and compresses it to dev32_t in 546 * LP64. We need to do a compaction of a long dev_t 547 * to a dev32_t in ILP32. 548 */ 549dev_t 550zfs_cmpldev(uint64_t dev) 551{ 552 return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64))); 553} 554 555static void 556zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp, 557 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl) 558{ 559 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs)); 560 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id))); 561 562 mutex_enter(&zp->z_lock); 563 564 ASSERT(zp->z_sa_hdl == NULL); 565 ASSERT(zp->z_acl_cached == NULL); 566 if (sa_hdl == NULL) { 567 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp, 568 SA_HDL_SHARED, &zp->z_sa_hdl)); 569 } else { 570 zp->z_sa_hdl = sa_hdl; 571 sa_set_userp(sa_hdl, zp); 572 } 573 574 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE; 575 576 /* 577 * Slap on VROOT if we are the root znode 578 */ 579 if (zp->z_id == zfsvfs->z_root) 580 ZTOV(zp)->v_flag |= VROOT; 581 582 mutex_exit(&zp->z_lock); 583 vn_exists(ZTOV(zp)); 584} 585 586void 587zfs_znode_dmu_fini(znode_t *zp) 588{ 589 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) || 590 zp->z_unlinked || 591 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock)); 592 593 sa_handle_destroy(zp->z_sa_hdl); 594 zp->z_sa_hdl = NULL; 595} 596 597static void 598zfs_vnode_forget(vnode_t *vp) 599{ 600 601 /* copied from insmntque_stddtr */ 602 vp->v_data = NULL; 603 vp->v_op = &dead_vnodeops; 604 vgone(vp); 605 vput(vp); 606} 607 608/* 609 * Construct a new znode/vnode and intialize. 610 * 611 * This does not do a call to dmu_set_user() that is 612 * up to the caller to do, in case you don't want to 613 * return the znode 614 */ 615static znode_t * 616zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz, 617 dmu_object_type_t obj_type, sa_handle_t *hdl) 618{ 619 znode_t *zp; 620 vnode_t *vp; 621 uint64_t mode; 622 uint64_t parent; 623 sa_bulk_attr_t bulk[9]; 624 int count = 0; 625 int error; 626 627 zp = kmem_cache_alloc(znode_cache, KM_SLEEP); 628 629 KASSERT(curthread->td_vp_reserv > 0, 630 ("zfs_znode_alloc: getnewvnode without any vnodes reserved")); 631 error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp); 632 if (error != 0) { 633 kmem_cache_free(znode_cache, zp); 634 return (NULL); 635 } 636 zp->z_vnode = vp; 637 vp->v_data = zp; 638 639 ASSERT(zp->z_dirlocks == NULL); 640 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 641 zp->z_moved = 0; 642 643 /* 644 * Defer setting z_zfsvfs until the znode is ready to be a candidate for 645 * the zfs_znode_move() callback. 646 */ 647 zp->z_sa_hdl = NULL; 648 zp->z_unlinked = 0; 649 zp->z_atime_dirty = 0; 650 zp->z_mapcnt = 0; 651 zp->z_id = db->db_object; 652 zp->z_blksz = blksz; 653 zp->z_seq = 0x7A4653; 654 zp->z_sync_cnt = 0; 655 656 vp = ZTOV(zp); 657 658 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl); 659 660 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8); 661 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8); 662 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 663 &zp->z_size, 8); 664 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 665 &zp->z_links, 8); 666 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 667 &zp->z_pflags, 8); 668 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8); 669 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 670 &zp->z_atime, 16); 671 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 672 &zp->z_uid, 8); 673 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 674 &zp->z_gid, 8); 675 676 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) { 677 if (hdl == NULL) 678 sa_handle_destroy(zp->z_sa_hdl); 679 zfs_vnode_forget(vp); 680 zp->z_vnode = NULL; 681 kmem_cache_free(znode_cache, zp); 682 return (NULL); 683 } 684 685 zp->z_mode = mode; 686 687 vp->v_type = IFTOVT((mode_t)mode); 688 689 switch (vp->v_type) { 690 case VDIR: 691 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ 692 break; 693#ifdef illumos 694 case VBLK: 695 case VCHR: 696 { 697 uint64_t rdev; 698 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), 699 &rdev, sizeof (rdev)) == 0); 700 701 vp->v_rdev = zfs_cmpldev(rdev); 702 } 703 break; 704#endif 705 case VFIFO: 706#ifdef illumos 707 case VSOCK: 708 case VDOOR: 709#endif 710 vp->v_op = &zfs_fifoops; 711 break; 712 case VREG: 713 if (parent == zfsvfs->z_shares_dir) { 714 ASSERT(zp->z_uid == 0 && zp->z_gid == 0); 715 vp->v_op = &zfs_shareops; 716 } 717 break; 718#ifdef illumos 719 case VLNK: 720 vn_setops(vp, zfs_symvnodeops); 721 break; 722 default: 723 vn_setops(vp, zfs_evnodeops); 724 break; 725#endif 726 } 727 728 mutex_enter(&zfsvfs->z_znodes_lock); 729 list_insert_tail(&zfsvfs->z_all_znodes, zp); 730 membar_producer(); 731 /* 732 * Everything else must be valid before assigning z_zfsvfs makes the 733 * znode eligible for zfs_znode_move(). 734 */ 735 zp->z_zfsvfs = zfsvfs; 736 mutex_exit(&zfsvfs->z_znodes_lock); 737 738 /* 739 * Acquire vnode lock before making it available to the world. 740 */ 741 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 742 VN_LOCK_AREC(vp); 743 if (vp->v_type != VFIFO) 744 VN_LOCK_ASHARE(vp); 745 746 VFS_HOLD(zfsvfs->z_vfs); 747 return (zp); 748} 749 750static uint64_t empty_xattr; 751static uint64_t pad[4]; 752static zfs_acl_phys_t acl_phys; 753/* 754 * Create a new DMU object to hold a zfs znode. 755 * 756 * IN: dzp - parent directory for new znode 757 * vap - file attributes for new znode 758 * tx - dmu transaction id for zap operations 759 * cr - credentials of caller 760 * flag - flags: 761 * IS_ROOT_NODE - new object will be root 762 * IS_XATTR - new object is an attribute 763 * bonuslen - length of bonus buffer 764 * setaclp - File/Dir initial ACL 765 * fuidp - Tracks fuid allocation. 766 * 767 * OUT: zpp - allocated znode 768 * 769 */ 770void 771zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 772 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids) 773{ 774 uint64_t crtime[2], atime[2], mtime[2], ctime[2]; 775 uint64_t mode, size, links, parent, pflags; 776 uint64_t dzp_pflags = 0; 777 uint64_t rdev = 0; 778 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 779 dmu_buf_t *db; 780 timestruc_t now; 781 uint64_t gen, obj; 782 int err; 783 int bonuslen; 784 sa_handle_t *sa_hdl; 785 dmu_object_type_t obj_type; 786 sa_bulk_attr_t sa_attrs[ZPL_END]; 787 int cnt = 0; 788 zfs_acl_locator_cb_t locate = { 0 }; 789 790 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); 791 792 if (zfsvfs->z_replay) { 793 obj = vap->va_nodeid; 794 now = vap->va_ctime; /* see zfs_replay_create() */ 795 gen = vap->va_nblocks; /* ditto */ 796 } else { 797 obj = 0; 798 gethrestime(&now); 799 gen = dmu_tx_get_txg(tx); 800 } 801 802 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE; 803 bonuslen = (obj_type == DMU_OT_SA) ? 804 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE; 805 806 /* 807 * Create a new DMU object. 808 */ 809 /* 810 * There's currently no mechanism for pre-reading the blocks that will 811 * be needed to allocate a new object, so we accept the small chance 812 * that there will be an i/o error and we will fail one of the 813 * assertions below. 814 */ 815 if (vap->va_type == VDIR) { 816 if (zfsvfs->z_replay) { 817 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj, 818 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 819 obj_type, bonuslen, tx)); 820 } else { 821 obj = zap_create_norm(zfsvfs->z_os, 822 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 823 obj_type, bonuslen, tx); 824 } 825 } else { 826 if (zfsvfs->z_replay) { 827 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj, 828 DMU_OT_PLAIN_FILE_CONTENTS, 0, 829 obj_type, bonuslen, tx)); 830 } else { 831 obj = dmu_object_alloc(zfsvfs->z_os, 832 DMU_OT_PLAIN_FILE_CONTENTS, 0, 833 obj_type, bonuslen, tx); 834 } 835 } 836 837 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 838 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db)); 839 840 /* 841 * If this is the root, fix up the half-initialized parent pointer 842 * to reference the just-allocated physical data area. 843 */ 844 if (flag & IS_ROOT_NODE) { 845 dzp->z_id = obj; 846 } else { 847 dzp_pflags = dzp->z_pflags; 848 } 849 850 /* 851 * If parent is an xattr, so am I. 852 */ 853 if (dzp_pflags & ZFS_XATTR) { 854 flag |= IS_XATTR; 855 } 856 857 if (zfsvfs->z_use_fuids) 858 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; 859 else 860 pflags = 0; 861 862 if (vap->va_type == VDIR) { 863 size = 2; /* contents ("." and "..") */ 864 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1; 865 } else { 866 size = links = 0; 867 } 868 869 if (vap->va_type == VBLK || vap->va_type == VCHR) { 870 rdev = zfs_expldev(vap->va_rdev); 871 } 872 873 parent = dzp->z_id; 874 mode = acl_ids->z_mode; 875 if (flag & IS_XATTR) 876 pflags |= ZFS_XATTR; 877 878 /* 879 * No execs denied will be deterimed when zfs_mode_compute() is called. 880 */ 881 pflags |= acl_ids->z_aclp->z_hints & 882 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT| 883 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED); 884 885 ZFS_TIME_ENCODE(&now, crtime); 886 ZFS_TIME_ENCODE(&now, ctime); 887 888 if (vap->va_mask & AT_ATIME) { 889 ZFS_TIME_ENCODE(&vap->va_atime, atime); 890 } else { 891 ZFS_TIME_ENCODE(&now, atime); 892 } 893 894 if (vap->va_mask & AT_MTIME) { 895 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 896 } else { 897 ZFS_TIME_ENCODE(&now, mtime); 898 } 899 900 /* Now add in all of the "SA" attributes */ 901 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED, 902 &sa_hdl)); 903 904 /* 905 * Setup the array of attributes to be replaced/set on the new file 906 * 907 * order for DMU_OT_ZNODE is critical since it needs to be constructed 908 * in the old znode_phys_t format. Don't change this ordering 909 */ 910 911 if (obj_type == DMU_OT_ZNODE) { 912 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 913 NULL, &atime, 16); 914 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 915 NULL, &mtime, 16); 916 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 917 NULL, &ctime, 16); 918 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 919 NULL, &crtime, 16); 920 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 921 NULL, &gen, 8); 922 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 923 NULL, &mode, 8); 924 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 925 NULL, &size, 8); 926 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 927 NULL, &parent, 8); 928 } else { 929 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 930 NULL, &mode, 8); 931 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 932 NULL, &size, 8); 933 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 934 NULL, &gen, 8); 935 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 936 &acl_ids->z_fuid, 8); 937 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 938 &acl_ids->z_fgid, 8); 939 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 940 NULL, &parent, 8); 941 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 942 NULL, &pflags, 8); 943 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 944 NULL, &atime, 16); 945 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 946 NULL, &mtime, 16); 947 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 948 NULL, &ctime, 16); 949 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 950 NULL, &crtime, 16); 951 } 952 953 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8); 954 955 if (obj_type == DMU_OT_ZNODE) { 956 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL, 957 &empty_xattr, 8); 958 } 959 if (obj_type == DMU_OT_ZNODE || 960 (vap->va_type == VBLK || vap->va_type == VCHR)) { 961 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs), 962 NULL, &rdev, 8); 963 964 } 965 if (obj_type == DMU_OT_ZNODE) { 966 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 967 NULL, &pflags, 8); 968 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 969 &acl_ids->z_fuid, 8); 970 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 971 &acl_ids->z_fgid, 8); 972 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad, 973 sizeof (uint64_t) * 4); 974 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL, 975 &acl_phys, sizeof (zfs_acl_phys_t)); 976 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) { 977 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL, 978 &acl_ids->z_aclp->z_acl_count, 8); 979 locate.cb_aclp = acl_ids->z_aclp; 980 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs), 981 zfs_acl_data_locator, &locate, 982 acl_ids->z_aclp->z_acl_bytes); 983 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags, 984 acl_ids->z_fuid, acl_ids->z_fgid); 985 } 986 987 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0); 988 989 if (!(flag & IS_ROOT_NODE)) { 990 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl); 991 ASSERT(*zpp != NULL); 992 } else { 993 /* 994 * If we are creating the root node, the "parent" we 995 * passed in is the znode for the root. 996 */ 997 *zpp = dzp; 998 999 (*zpp)->z_sa_hdl = sa_hdl; 1000 } 1001 1002 (*zpp)->z_pflags = pflags; 1003 (*zpp)->z_mode = mode; 1004 1005 if (vap->va_mask & AT_XVATTR) 1006 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx); 1007 1008 if (obj_type == DMU_OT_ZNODE || 1009 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) { 1010 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx)); 1011 } 1012 if (!(flag & IS_ROOT_NODE)) { 1013 vnode_t *vp; 1014 1015 vp = ZTOV(*zpp); 1016 vp->v_vflag |= VV_FORCEINSMQ; 1017 err = insmntque(vp, zfsvfs->z_vfs); 1018 vp->v_vflag &= ~VV_FORCEINSMQ; 1019 KASSERT(err == 0, ("insmntque() failed: error %d", err)); 1020 } 1021 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1022} 1023 1024/* 1025 * Update in-core attributes. It is assumed the caller will be doing an 1026 * sa_bulk_update to push the changes out. 1027 */ 1028void 1029zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx) 1030{ 1031 xoptattr_t *xoap; 1032 1033 xoap = xva_getxoptattr(xvap); 1034 ASSERT(xoap); 1035 1036 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 1037 uint64_t times[2]; 1038 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times); 1039 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs), 1040 ×, sizeof (times), tx); 1041 XVA_SET_RTN(xvap, XAT_CREATETIME); 1042 } 1043 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 1044 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly, 1045 zp->z_pflags, tx); 1046 XVA_SET_RTN(xvap, XAT_READONLY); 1047 } 1048 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 1049 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden, 1050 zp->z_pflags, tx); 1051 XVA_SET_RTN(xvap, XAT_HIDDEN); 1052 } 1053 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 1054 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system, 1055 zp->z_pflags, tx); 1056 XVA_SET_RTN(xvap, XAT_SYSTEM); 1057 } 1058 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 1059 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive, 1060 zp->z_pflags, tx); 1061 XVA_SET_RTN(xvap, XAT_ARCHIVE); 1062 } 1063 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 1064 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable, 1065 zp->z_pflags, tx); 1066 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 1067 } 1068 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 1069 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink, 1070 zp->z_pflags, tx); 1071 XVA_SET_RTN(xvap, XAT_NOUNLINK); 1072 } 1073 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 1074 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly, 1075 zp->z_pflags, tx); 1076 XVA_SET_RTN(xvap, XAT_APPENDONLY); 1077 } 1078 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 1079 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump, 1080 zp->z_pflags, tx); 1081 XVA_SET_RTN(xvap, XAT_NODUMP); 1082 } 1083 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 1084 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque, 1085 zp->z_pflags, tx); 1086 XVA_SET_RTN(xvap, XAT_OPAQUE); 1087 } 1088 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 1089 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED, 1090 xoap->xoa_av_quarantined, zp->z_pflags, tx); 1091 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 1092 } 1093 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 1094 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified, 1095 zp->z_pflags, tx); 1096 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 1097 } 1098 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { 1099 zfs_sa_set_scanstamp(zp, xvap, tx); 1100 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); 1101 } 1102 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 1103 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse, 1104 zp->z_pflags, tx); 1105 XVA_SET_RTN(xvap, XAT_REPARSE); 1106 } 1107 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 1108 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline, 1109 zp->z_pflags, tx); 1110 XVA_SET_RTN(xvap, XAT_OFFLINE); 1111 } 1112 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 1113 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse, 1114 zp->z_pflags, tx); 1115 XVA_SET_RTN(xvap, XAT_SPARSE); 1116 } 1117} 1118 1119int 1120zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 1121{ 1122 dmu_object_info_t doi; 1123 dmu_buf_t *db; 1124 znode_t *zp; 1125 vnode_t *vp; 1126 sa_handle_t *hdl; 1127 struct thread *td; 1128 int locked; 1129 int err; 1130 1131 td = curthread; 1132 getnewvnode_reserve(1); 1133again: 1134 *zpp = NULL; 1135 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1136 1137 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1138 if (err) { 1139 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1140 getnewvnode_drop_reserve(); 1141 return (err); 1142 } 1143 1144 dmu_object_info_from_db(db, &doi); 1145 if (doi.doi_bonus_type != DMU_OT_SA && 1146 (doi.doi_bonus_type != DMU_OT_ZNODE || 1147 (doi.doi_bonus_type == DMU_OT_ZNODE && 1148 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1149 sa_buf_rele(db, NULL); 1150 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1151#ifdef __FreeBSD__ 1152 getnewvnode_drop_reserve(); 1153#endif 1154 return (SET_ERROR(EINVAL)); 1155 } 1156 1157 hdl = dmu_buf_get_user(db); 1158 if (hdl != NULL) { 1159 zp = sa_get_userdata(hdl); 1160 1161 1162 /* 1163 * Since "SA" does immediate eviction we 1164 * should never find a sa handle that doesn't 1165 * know about the znode. 1166 */ 1167 1168 ASSERT3P(zp, !=, NULL); 1169 1170 mutex_enter(&zp->z_lock); 1171 ASSERT3U(zp->z_id, ==, obj_num); 1172 if (zp->z_unlinked) { 1173 err = SET_ERROR(ENOENT); 1174 } else { 1175 vp = ZTOV(zp); 1176 *zpp = zp; 1177 err = 0; 1178 } 1179 1180 /* Don't let the vnode disappear after ZFS_OBJ_HOLD_EXIT. */ 1181 if (err == 0) 1182 VN_HOLD(vp); 1183 1184 mutex_exit(&zp->z_lock); 1185 sa_buf_rele(db, NULL); 1186 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1187 1188 if (err == 0) { 1189 locked = VOP_ISLOCKED(vp); 1190 VI_LOCK(vp); 1191 if ((vp->v_iflag & VI_DOOMED) != 0 && 1192 locked != LK_EXCLUSIVE) { 1193 /* 1194 * The vnode is doomed and this thread doesn't 1195 * hold the exclusive lock on it, so the vnode 1196 * must be being reclaimed by another thread. 1197 * Otherwise the doomed vnode is being reclaimed 1198 * by this thread and zfs_zget is called from 1199 * ZIL internals. 1200 */ 1201 VI_UNLOCK(vp); 1202 VN_RELE(vp); 1203 goto again; 1204 } 1205 VI_UNLOCK(vp); 1206 } 1207 getnewvnode_drop_reserve(); 1208 return (err); 1209 } 1210 1211 /* 1212 * Not found create new znode/vnode 1213 * but only if file exists. 1214 * 1215 * There is a small window where zfs_vget() could 1216 * find this object while a file create is still in 1217 * progress. This is checked for in zfs_znode_alloc() 1218 * 1219 * if zfs_znode_alloc() fails it will drop the hold on the 1220 * bonus buffer. 1221 */ 1222 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size, 1223 doi.doi_bonus_type, NULL); 1224 if (zp == NULL) { 1225 err = SET_ERROR(ENOENT); 1226 } else { 1227 *zpp = zp; 1228 } 1229 if (err == 0) { 1230 vnode_t *vp = ZTOV(zp); 1231 1232 err = insmntque(vp, zfsvfs->z_vfs); 1233 if (err == 0) { 1234 vp->v_hash = obj_num; 1235 VOP_UNLOCK(vp, 0); 1236 } else { 1237 zp->z_vnode = NULL; 1238 zfs_znode_dmu_fini(zp); 1239 zfs_znode_free(zp); 1240 *zpp = NULL; 1241 } 1242 } 1243 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1244 getnewvnode_drop_reserve(); 1245 return (err); 1246} 1247 1248int 1249zfs_rezget(znode_t *zp) 1250{ 1251 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1252 dmu_object_info_t doi; 1253 dmu_buf_t *db; 1254 vnode_t *vp; 1255 uint64_t obj_num = zp->z_id; 1256 uint64_t mode, size; 1257 sa_bulk_attr_t bulk[8]; 1258 int err; 1259 int count = 0; 1260 uint64_t gen; 1261 1262 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1263 1264 mutex_enter(&zp->z_acl_lock); 1265 if (zp->z_acl_cached) { 1266 zfs_acl_free(zp->z_acl_cached); 1267 zp->z_acl_cached = NULL; 1268 } 1269 1270 mutex_exit(&zp->z_acl_lock); 1271 ASSERT(zp->z_sa_hdl == NULL); 1272 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1273 if (err) { 1274 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1275 return (err); 1276 } 1277 1278 dmu_object_info_from_db(db, &doi); 1279 if (doi.doi_bonus_type != DMU_OT_SA && 1280 (doi.doi_bonus_type != DMU_OT_ZNODE || 1281 (doi.doi_bonus_type == DMU_OT_ZNODE && 1282 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1283 sa_buf_rele(db, NULL); 1284 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1285 return (SET_ERROR(EINVAL)); 1286 } 1287 1288 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL); 1289 size = zp->z_size; 1290 1291 /* reload cached values */ 1292 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, 1293 &gen, sizeof (gen)); 1294 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 1295 &zp->z_size, sizeof (zp->z_size)); 1296 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 1297 &zp->z_links, sizeof (zp->z_links)); 1298 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 1299 &zp->z_pflags, sizeof (zp->z_pflags)); 1300 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 1301 &zp->z_atime, sizeof (zp->z_atime)); 1302 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 1303 &zp->z_uid, sizeof (zp->z_uid)); 1304 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 1305 &zp->z_gid, sizeof (zp->z_gid)); 1306 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 1307 &mode, sizeof (mode)); 1308 1309 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) { 1310 zfs_znode_dmu_fini(zp); 1311 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1312 return (SET_ERROR(EIO)); 1313 } 1314 1315 zp->z_mode = mode; 1316 1317 if (gen != zp->z_gen) { 1318 zfs_znode_dmu_fini(zp); 1319 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1320 return (SET_ERROR(EIO)); 1321 } 1322 1323 /* 1324 * It is highly improbable but still quite possible that two 1325 * objects in different datasets are created with the same 1326 * object numbers and in transaction groups with the same 1327 * numbers. znodes corresponding to those objects would 1328 * have the same z_id and z_gen, but their other attributes 1329 * may be different. 1330 * zfs recv -F may replace one of such objects with the other. 1331 * As a result file properties recorded in the replaced 1332 * object's vnode may no longer match the received object's 1333 * properties. At present the only cached property is the 1334 * files type recorded in v_type. 1335 * So, handle this case by leaving the old vnode and znode 1336 * disassociated from the actual object. A new vnode and a 1337 * znode will be created if the object is accessed 1338 * (e.g. via a look-up). The old vnode and znode will be 1339 * recycled when the last vnode reference is dropped. 1340 */ 1341 vp = ZTOV(zp); 1342 if (vp != NULL && vp->v_type != IFTOVT((mode_t)zp->z_mode)) { 1343 zfs_znode_dmu_fini(zp); 1344 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1345 return (EIO); 1346 } 1347 1348 zp->z_unlinked = (zp->z_links == 0); 1349 zp->z_blksz = doi.doi_data_block_size; 1350 if (vp != NULL) { 1351 vn_pages_remove(vp, 0, 0); 1352 if (zp->z_size != size) 1353 vnode_pager_setsize(vp, zp->z_size); 1354 } 1355 1356 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1357 1358 return (0); 1359} 1360 1361void 1362zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) 1363{ 1364 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1365 objset_t *os = zfsvfs->z_os; 1366 uint64_t obj = zp->z_id; 1367 uint64_t acl_obj = zfs_external_acl(zp); 1368 1369 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 1370 if (acl_obj) { 1371 VERIFY(!zp->z_is_sa); 1372 VERIFY(0 == dmu_object_free(os, acl_obj, tx)); 1373 } 1374 VERIFY(0 == dmu_object_free(os, obj, tx)); 1375 zfs_znode_dmu_fini(zp); 1376 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1377 zfs_znode_free(zp); 1378} 1379 1380void 1381zfs_zinactive(znode_t *zp) 1382{ 1383 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1384 uint64_t z_id = zp->z_id; 1385 1386 ASSERT(zp->z_sa_hdl); 1387 1388 /* 1389 * Don't allow a zfs_zget() while were trying to release this znode 1390 */ 1391 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); 1392 1393 mutex_enter(&zp->z_lock); 1394 1395 /* 1396 * If this was the last reference to a file with no links, 1397 * remove the file from the file system. 1398 */ 1399 if (zp->z_unlinked) { 1400 mutex_exit(&zp->z_lock); 1401 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1402 zfs_rmnode(zp); 1403 return; 1404 } 1405 1406 mutex_exit(&zp->z_lock); 1407 zfs_znode_dmu_fini(zp); 1408 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1409 zfs_znode_free(zp); 1410} 1411 1412void 1413zfs_znode_free(znode_t *zp) 1414{ 1415 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1416 1417 ASSERT(zp->z_sa_hdl == NULL); 1418 zp->z_vnode = NULL; 1419 mutex_enter(&zfsvfs->z_znodes_lock); 1420 POINTER_INVALIDATE(&zp->z_zfsvfs); 1421 list_remove(&zfsvfs->z_all_znodes, zp); 1422 mutex_exit(&zfsvfs->z_znodes_lock); 1423 1424 if (zp->z_acl_cached) { 1425 zfs_acl_free(zp->z_acl_cached); 1426 zp->z_acl_cached = NULL; 1427 } 1428 1429 kmem_cache_free(znode_cache, zp); 1430 1431 VFS_RELE(zfsvfs->z_vfs); 1432} 1433 1434void 1435zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2], 1436 uint64_t ctime[2], boolean_t have_tx) 1437{ 1438 timestruc_t now; 1439 1440 gethrestime(&now); 1441 1442 if (have_tx) { /* will sa_bulk_update happen really soon? */ 1443 zp->z_atime_dirty = 0; 1444 zp->z_seq++; 1445 } else { 1446 zp->z_atime_dirty = 1; 1447 } 1448 1449 if (flag & AT_ATIME) { 1450 ZFS_TIME_ENCODE(&now, zp->z_atime); 1451 } 1452 1453 if (flag & AT_MTIME) { 1454 ZFS_TIME_ENCODE(&now, mtime); 1455 if (zp->z_zfsvfs->z_use_fuids) { 1456 zp->z_pflags |= (ZFS_ARCHIVE | 1457 ZFS_AV_MODIFIED); 1458 } 1459 } 1460 1461 if (flag & AT_CTIME) { 1462 ZFS_TIME_ENCODE(&now, ctime); 1463 if (zp->z_zfsvfs->z_use_fuids) 1464 zp->z_pflags |= ZFS_ARCHIVE; 1465 } 1466} 1467 1468/* 1469 * Grow the block size for a file. 1470 * 1471 * IN: zp - znode of file to free data in. 1472 * size - requested block size 1473 * tx - open transaction. 1474 * 1475 * NOTE: this function assumes that the znode is write locked. 1476 */ 1477void 1478zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx) 1479{ 1480 int error; 1481 u_longlong_t dummy; 1482 1483 if (size <= zp->z_blksz) 1484 return; 1485 /* 1486 * If the file size is already greater than the current blocksize, 1487 * we will not grow. If there is more than one block in a file, 1488 * the blocksize cannot change. 1489 */ 1490 if (zp->z_blksz && zp->z_size > zp->z_blksz) 1491 return; 1492 1493 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id, 1494 size, 0, tx); 1495 1496 if (error == ENOTSUP) 1497 return; 1498 ASSERT0(error); 1499 1500 /* What blocksize did we actually get? */ 1501 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy); 1502} 1503 1504#ifdef illumos 1505/* 1506 * This is a dummy interface used when pvn_vplist_dirty() should *not* 1507 * be calling back into the fs for a putpage(). E.g.: when truncating 1508 * a file, the pages being "thrown away* don't need to be written out. 1509 */ 1510/* ARGSUSED */ 1511static int 1512zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, 1513 int flags, cred_t *cr) 1514{ 1515 ASSERT(0); 1516 return (0); 1517} 1518#endif 1519 1520/* 1521 * Increase the file length 1522 * 1523 * IN: zp - znode of file to free data in. 1524 * end - new end-of-file 1525 * 1526 * RETURN: 0 on success, error code on failure 1527 */ 1528static int 1529zfs_extend(znode_t *zp, uint64_t end) 1530{ 1531 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1532 dmu_tx_t *tx; 1533 rl_t *rl; 1534 uint64_t newblksz; 1535 int error; 1536 1537 /* 1538 * We will change zp_size, lock the whole file. 1539 */ 1540 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1541 1542 /* 1543 * Nothing to do if file already at desired length. 1544 */ 1545 if (end <= zp->z_size) { 1546 zfs_range_unlock(rl); 1547 return (0); 1548 } 1549 tx = dmu_tx_create(zfsvfs->z_os); 1550 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1551 zfs_sa_upgrade_txholds(tx, zp); 1552 if (end > zp->z_blksz && 1553 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) { 1554 /* 1555 * We are growing the file past the current block size. 1556 */ 1557 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) { 1558 /* 1559 * File's blocksize is already larger than the 1560 * "recordsize" property. Only let it grow to 1561 * the next power of 2. 1562 */ 1563 ASSERT(!ISP2(zp->z_blksz)); 1564 newblksz = MIN(end, 1 << highbit64(zp->z_blksz)); 1565 } else { 1566 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz); 1567 } 1568 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); 1569 } else { 1570 newblksz = 0; 1571 } 1572 1573 error = dmu_tx_assign(tx, TXG_WAIT); 1574 if (error) { 1575 dmu_tx_abort(tx); 1576 zfs_range_unlock(rl); 1577 return (error); 1578 } 1579 1580 if (newblksz) 1581 zfs_grow_blocksize(zp, newblksz, tx); 1582 1583 zp->z_size = end; 1584 1585 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs), 1586 &zp->z_size, sizeof (zp->z_size), tx)); 1587 1588 vnode_pager_setsize(ZTOV(zp), end); 1589 1590 zfs_range_unlock(rl); 1591 1592 dmu_tx_commit(tx); 1593 1594 return (0); 1595} 1596 1597/* 1598 * Free space in a file. 1599 * 1600 * IN: zp - znode of file to free data in. 1601 * off - start of section to free. 1602 * len - length of section to free. 1603 * 1604 * RETURN: 0 on success, error code on failure 1605 */ 1606static int 1607zfs_free_range(znode_t *zp, uint64_t off, uint64_t len) 1608{ 1609 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1610 rl_t *rl; 1611 int error; 1612 1613 /* 1614 * Lock the range being freed. 1615 */ 1616 rl = zfs_range_lock(zp, off, len, RL_WRITER); 1617 1618 /* 1619 * Nothing to do if file already at desired length. 1620 */ 1621 if (off >= zp->z_size) { 1622 zfs_range_unlock(rl); 1623 return (0); 1624 } 1625 1626 if (off + len > zp->z_size) 1627 len = zp->z_size - off; 1628 1629 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len); 1630 1631 if (error == 0) { 1632 /* 1633 * In FreeBSD we cannot free block in the middle of a file, 1634 * but only at the end of a file, so this code path should 1635 * never happen. 1636 */ 1637 vnode_pager_setsize(ZTOV(zp), off); 1638 } 1639 1640 zfs_range_unlock(rl); 1641 1642 return (error); 1643} 1644 1645/* 1646 * Truncate a file 1647 * 1648 * IN: zp - znode of file to free data in. 1649 * end - new end-of-file. 1650 * 1651 * RETURN: 0 on success, error code on failure 1652 */ 1653static int 1654zfs_trunc(znode_t *zp, uint64_t end) 1655{ 1656 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1657 vnode_t *vp = ZTOV(zp); 1658 dmu_tx_t *tx; 1659 rl_t *rl; 1660 int error; 1661 sa_bulk_attr_t bulk[2]; 1662 int count = 0; 1663 1664 /* 1665 * We will change zp_size, lock the whole file. 1666 */ 1667 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1668 1669 /* 1670 * Nothing to do if file already at desired length. 1671 */ 1672 if (end >= zp->z_size) { 1673 zfs_range_unlock(rl); 1674 return (0); 1675 } 1676 1677 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1); 1678 if (error) { 1679 zfs_range_unlock(rl); 1680 return (error); 1681 } 1682 tx = dmu_tx_create(zfsvfs->z_os); 1683 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1684 zfs_sa_upgrade_txholds(tx, zp); 1685 dmu_tx_mark_netfree(tx); 1686 error = dmu_tx_assign(tx, TXG_WAIT); 1687 if (error) { 1688 dmu_tx_abort(tx); 1689 zfs_range_unlock(rl); 1690 return (error); 1691 } 1692 1693 zp->z_size = end; 1694 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), 1695 NULL, &zp->z_size, sizeof (zp->z_size)); 1696 1697 if (end == 0) { 1698 zp->z_pflags &= ~ZFS_SPARSE; 1699 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1700 NULL, &zp->z_pflags, 8); 1701 } 1702 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0); 1703 1704 dmu_tx_commit(tx); 1705 1706 /* 1707 * Clear any mapped pages in the truncated region. This has to 1708 * happen outside of the transaction to avoid the possibility of 1709 * a deadlock with someone trying to push a page that we are 1710 * about to invalidate. 1711 */ 1712 vnode_pager_setsize(vp, end); 1713 1714 zfs_range_unlock(rl); 1715 1716 return (0); 1717} 1718 1719/* 1720 * Free space in a file 1721 * 1722 * IN: zp - znode of file to free data in. 1723 * off - start of range 1724 * len - end of range (0 => EOF) 1725 * flag - current file open mode flags. 1726 * log - TRUE if this action should be logged 1727 * 1728 * RETURN: 0 on success, error code on failure 1729 */ 1730int 1731zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) 1732{ 1733 vnode_t *vp = ZTOV(zp); 1734 dmu_tx_t *tx; 1735 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1736 zilog_t *zilog = zfsvfs->z_log; 1737 uint64_t mode; 1738 uint64_t mtime[2], ctime[2]; 1739 sa_bulk_attr_t bulk[3]; 1740 int count = 0; 1741 int error; 1742 1743 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode, 1744 sizeof (mode))) != 0) 1745 return (error); 1746 1747 if (off > zp->z_size) { 1748 error = zfs_extend(zp, off+len); 1749 if (error == 0 && log) 1750 goto log; 1751 else 1752 return (error); 1753 } 1754 1755 /* 1756 * Check for any locks in the region to be freed. 1757 */ 1758 1759 if (MANDLOCK(vp, (mode_t)mode)) { 1760 uint64_t length = (len ? len : zp->z_size - off); 1761 if (error = chklock(vp, FWRITE, off, length, flag, NULL)) 1762 return (error); 1763 } 1764 1765 if (len == 0) { 1766 error = zfs_trunc(zp, off); 1767 } else { 1768 if ((error = zfs_free_range(zp, off, len)) == 0 && 1769 off + len > zp->z_size) 1770 error = zfs_extend(zp, off+len); 1771 } 1772 if (error || !log) 1773 return (error); 1774log: 1775 tx = dmu_tx_create(zfsvfs->z_os); 1776 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1777 zfs_sa_upgrade_txholds(tx, zp); 1778 error = dmu_tx_assign(tx, TXG_WAIT); 1779 if (error) { 1780 dmu_tx_abort(tx); 1781 return (error); 1782 } 1783 1784 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16); 1785 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16); 1786 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1787 NULL, &zp->z_pflags, 8); 1788 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); 1789 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 1790 ASSERT(error == 0); 1791 1792 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); 1793 1794 dmu_tx_commit(tx); 1795 return (0); 1796} 1797 1798void 1799zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) 1800{ 1801 uint64_t moid, obj, sa_obj, version; 1802 uint64_t sense = ZFS_CASE_SENSITIVE; 1803 uint64_t norm = 0; 1804 nvpair_t *elem; 1805 int error; 1806 int i; 1807 znode_t *rootzp = NULL; 1808 zfsvfs_t *zfsvfs; 1809 vattr_t vattr; 1810 znode_t *zp; 1811 zfs_acl_ids_t acl_ids; 1812 1813 /* 1814 * First attempt to create master node. 1815 */ 1816 /* 1817 * In an empty objset, there are no blocks to read and thus 1818 * there can be no i/o errors (which we assert below). 1819 */ 1820 moid = MASTER_NODE_OBJ; 1821 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE, 1822 DMU_OT_NONE, 0, tx); 1823 ASSERT(error == 0); 1824 1825 /* 1826 * Set starting attributes. 1827 */ 1828 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os))); 1829 elem = NULL; 1830 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) { 1831 /* For the moment we expect all zpl props to be uint64_ts */ 1832 uint64_t val; 1833 char *name; 1834 1835 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64); 1836 VERIFY(nvpair_value_uint64(elem, &val) == 0); 1837 name = nvpair_name(elem); 1838 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) { 1839 if (val < version) 1840 version = val; 1841 } else { 1842 error = zap_update(os, moid, name, 8, 1, &val, tx); 1843 } 1844 ASSERT(error == 0); 1845 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0) 1846 norm = val; 1847 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0) 1848 sense = val; 1849 } 1850 ASSERT(version != 0); 1851 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx); 1852 1853 /* 1854 * Create zap object used for SA attribute registration 1855 */ 1856 1857 if (version >= ZPL_VERSION_SA) { 1858 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 1859 DMU_OT_NONE, 0, tx); 1860 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 1861 ASSERT(error == 0); 1862 } else { 1863 sa_obj = 0; 1864 } 1865 /* 1866 * Create a delete queue. 1867 */ 1868 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); 1869 1870 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx); 1871 ASSERT(error == 0); 1872 1873 /* 1874 * Create root znode. Create minimal znode/vnode/zfsvfs 1875 * to allow zfs_mknode to work. 1876 */ 1877 VATTR_NULL(&vattr); 1878 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 1879 vattr.va_type = VDIR; 1880 vattr.va_mode = S_IFDIR|0755; 1881 vattr.va_uid = crgetuid(cr); 1882 vattr.va_gid = crgetgid(cr); 1883 1884 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 1885 1886 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP); 1887 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs)); 1888 rootzp->z_moved = 0; 1889 rootzp->z_unlinked = 0; 1890 rootzp->z_atime_dirty = 0; 1891 rootzp->z_is_sa = USE_SA(version, os); 1892 1893 zfsvfs->z_os = os; 1894 zfsvfs->z_parent = zfsvfs; 1895 zfsvfs->z_version = version; 1896 zfsvfs->z_use_fuids = USE_FUIDS(version, os); 1897 zfsvfs->z_use_sa = USE_SA(version, os); 1898 zfsvfs->z_norm = norm; 1899 1900 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 1901 &zfsvfs->z_attr_table); 1902 1903 ASSERT(error == 0); 1904 1905 /* 1906 * Fold case on file systems that are always or sometimes case 1907 * insensitive. 1908 */ 1909 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED) 1910 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 1911 1912 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 1913 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 1914 offsetof(znode_t, z_link_node)); 1915 1916 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1917 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 1918 1919 rootzp->z_zfsvfs = zfsvfs; 1920 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr, 1921 cr, NULL, &acl_ids)); 1922 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids); 1923 ASSERT3P(zp, ==, rootzp); 1924 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); 1925 ASSERT(error == 0); 1926 zfs_acl_ids_free(&acl_ids); 1927 POINTER_INVALIDATE(&rootzp->z_zfsvfs); 1928 1929 sa_handle_destroy(rootzp->z_sa_hdl); 1930 kmem_cache_free(znode_cache, rootzp); 1931 1932 /* 1933 * Create shares directory 1934 */ 1935 1936 error = zfs_create_share_dir(zfsvfs, tx); 1937 1938 ASSERT(error == 0); 1939 1940 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1941 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1942 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1943} 1944 1945#endif /* _KERNEL */ 1946 1947static int 1948zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table) 1949{ 1950 uint64_t sa_obj = 0; 1951 int error; 1952 1953 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj); 1954 if (error != 0 && error != ENOENT) 1955 return (error); 1956 1957 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table); 1958 return (error); 1959} 1960 1961static int 1962zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp, 1963 dmu_buf_t **db, void *tag) 1964{ 1965 dmu_object_info_t doi; 1966 int error; 1967 1968 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0) 1969 return (error); 1970 1971 dmu_object_info_from_db(*db, &doi); 1972 if ((doi.doi_bonus_type != DMU_OT_SA && 1973 doi.doi_bonus_type != DMU_OT_ZNODE) || 1974 doi.doi_bonus_type == DMU_OT_ZNODE && 1975 doi.doi_bonus_size < sizeof (znode_phys_t)) { 1976 sa_buf_rele(*db, tag); 1977 return (SET_ERROR(ENOTSUP)); 1978 } 1979 1980 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp); 1981 if (error != 0) { 1982 sa_buf_rele(*db, tag); 1983 return (error); 1984 } 1985 1986 return (0); 1987} 1988 1989void 1990zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag) 1991{ 1992 sa_handle_destroy(hdl); 1993 sa_buf_rele(db, tag); 1994} 1995 1996/* 1997 * Given an object number, return its parent object number and whether 1998 * or not the object is an extended attribute directory. 1999 */ 2000static int 2001zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table, 2002 uint64_t *pobjp, int *is_xattrdir) 2003{ 2004 uint64_t parent; 2005 uint64_t pflags; 2006 uint64_t mode; 2007 uint64_t parent_mode; 2008 sa_bulk_attr_t bulk[3]; 2009 sa_handle_t *sa_hdl; 2010 dmu_buf_t *sa_db; 2011 int count = 0; 2012 int error; 2013 2014 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL, 2015 &parent, sizeof (parent)); 2016 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL, 2017 &pflags, sizeof (pflags)); 2018 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2019 &mode, sizeof (mode)); 2020 2021 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0) 2022 return (error); 2023 2024 /* 2025 * When a link is removed its parent pointer is not changed and will 2026 * be invalid. There are two cases where a link is removed but the 2027 * file stays around, when it goes to the delete queue and when there 2028 * are additional links. 2029 */ 2030 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG); 2031 if (error != 0) 2032 return (error); 2033 2034 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode)); 2035 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2036 if (error != 0) 2037 return (error); 2038 2039 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode); 2040 2041 /* 2042 * Extended attributes can be applied to files, directories, etc. 2043 * Otherwise the parent must be a directory. 2044 */ 2045 if (!*is_xattrdir && !S_ISDIR(parent_mode)) 2046 return (SET_ERROR(EINVAL)); 2047 2048 *pobjp = parent; 2049 2050 return (0); 2051} 2052 2053/* 2054 * Given an object number, return some zpl level statistics 2055 */ 2056static int 2057zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table, 2058 zfs_stat_t *sb) 2059{ 2060 sa_bulk_attr_t bulk[4]; 2061 int count = 0; 2062 2063 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2064 &sb->zs_mode, sizeof (sb->zs_mode)); 2065 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL, 2066 &sb->zs_gen, sizeof (sb->zs_gen)); 2067 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL, 2068 &sb->zs_links, sizeof (sb->zs_links)); 2069 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL, 2070 &sb->zs_ctime, sizeof (sb->zs_ctime)); 2071 2072 return (sa_bulk_lookup(hdl, bulk, count)); 2073} 2074 2075static int 2076zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl, 2077 sa_attr_type_t *sa_table, char *buf, int len) 2078{ 2079 sa_handle_t *sa_hdl; 2080 sa_handle_t *prevhdl = NULL; 2081 dmu_buf_t *prevdb = NULL; 2082 dmu_buf_t *sa_db = NULL; 2083 char *path = buf + len - 1; 2084 int error; 2085 2086 *path = '\0'; 2087 sa_hdl = hdl; 2088 2089 for (;;) { 2090 uint64_t pobj; 2091 char component[MAXNAMELEN + 2]; 2092 size_t complen; 2093 int is_xattrdir; 2094 2095 if (prevdb) 2096 zfs_release_sa_handle(prevhdl, prevdb, FTAG); 2097 2098 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj, 2099 &is_xattrdir)) != 0) 2100 break; 2101 2102 if (pobj == obj) { 2103 if (path[0] != '/') 2104 *--path = '/'; 2105 break; 2106 } 2107 2108 component[0] = '/'; 2109 if (is_xattrdir) { 2110 (void) sprintf(component + 1, "<xattrdir>"); 2111 } else { 2112 error = zap_value_search(osp, pobj, obj, 2113 ZFS_DIRENT_OBJ(-1ULL), component + 1); 2114 if (error != 0) 2115 break; 2116 } 2117 2118 complen = strlen(component); 2119 path -= complen; 2120 ASSERT(path >= buf); 2121 bcopy(component, path, complen); 2122 obj = pobj; 2123 2124 if (sa_hdl != hdl) { 2125 prevhdl = sa_hdl; 2126 prevdb = sa_db; 2127 } 2128 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG); 2129 if (error != 0) { 2130 sa_hdl = prevhdl; 2131 sa_db = prevdb; 2132 break; 2133 } 2134 } 2135 2136 if (sa_hdl != NULL && sa_hdl != hdl) { 2137 ASSERT(sa_db != NULL); 2138 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2139 } 2140 2141 if (error == 0) 2142 (void) memmove(buf, path, buf + len - path); 2143 2144 return (error); 2145} 2146 2147int 2148zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) 2149{ 2150 sa_attr_type_t *sa_table; 2151 sa_handle_t *hdl; 2152 dmu_buf_t *db; 2153 int error; 2154 2155 error = zfs_sa_setup(osp, &sa_table); 2156 if (error != 0) 2157 return (error); 2158 2159 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2160 if (error != 0) 2161 return (error); 2162 2163 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2164 2165 zfs_release_sa_handle(hdl, db, FTAG); 2166 return (error); 2167} 2168 2169int 2170zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb, 2171 char *buf, int len) 2172{ 2173 char *path = buf + len - 1; 2174 sa_attr_type_t *sa_table; 2175 sa_handle_t *hdl; 2176 dmu_buf_t *db; 2177 int error; 2178 2179 *path = '\0'; 2180 2181 error = zfs_sa_setup(osp, &sa_table); 2182 if (error != 0) 2183 return (error); 2184 2185 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2186 if (error != 0) 2187 return (error); 2188 2189 error = zfs_obj_to_stats_impl(hdl, sa_table, sb); 2190 if (error != 0) { 2191 zfs_release_sa_handle(hdl, db, FTAG); 2192 return (error); 2193 } 2194 2195 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2196 2197 zfs_release_sa_handle(hdl, db, FTAG); 2198 return (error); 2199} 2200