zfs_znode.c revision 302738
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 unless we are the root 578 * node of a snapshot mounted under .zfs. 579 */ 580 if (zp->z_id == zfsvfs->z_root && zfsvfs->z_parent == zfsvfs) 581 ZTOV(zp)->v_flag |= VROOT; 582 583 mutex_exit(&zp->z_lock); 584 vn_exists(ZTOV(zp)); 585} 586 587void 588zfs_znode_dmu_fini(znode_t *zp) 589{ 590 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) || 591 zp->z_unlinked || 592 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock)); 593 594 sa_handle_destroy(zp->z_sa_hdl); 595 zp->z_sa_hdl = NULL; 596} 597 598static void 599zfs_vnode_forget(vnode_t *vp) 600{ 601 602 /* copied from insmntque_stddtr */ 603 vp->v_data = NULL; 604 vp->v_op = &dead_vnodeops; 605 vgone(vp); 606 vput(vp); 607} 608 609/* 610 * Construct a new znode/vnode and intialize. 611 * 612 * This does not do a call to dmu_set_user() that is 613 * up to the caller to do, in case you don't want to 614 * return the znode 615 */ 616static znode_t * 617zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz, 618 dmu_object_type_t obj_type, sa_handle_t *hdl) 619{ 620 znode_t *zp; 621 vnode_t *vp; 622 uint64_t mode; 623 uint64_t parent; 624 sa_bulk_attr_t bulk[9]; 625 int count = 0; 626 int error; 627 628 zp = kmem_cache_alloc(znode_cache, KM_SLEEP); 629 630 KASSERT(curthread->td_vp_reserv > 0, 631 ("zfs_znode_alloc: getnewvnode without any vnodes reserved")); 632 error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp); 633 if (error != 0) { 634 kmem_cache_free(znode_cache, zp); 635 return (NULL); 636 } 637 zp->z_vnode = vp; 638 vp->v_data = zp; 639 640 ASSERT(zp->z_dirlocks == NULL); 641 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 642 zp->z_moved = 0; 643 644 /* 645 * Defer setting z_zfsvfs until the znode is ready to be a candidate for 646 * the zfs_znode_move() callback. 647 */ 648 zp->z_sa_hdl = NULL; 649 zp->z_unlinked = 0; 650 zp->z_atime_dirty = 0; 651 zp->z_mapcnt = 0; 652 zp->z_id = db->db_object; 653 zp->z_blksz = blksz; 654 zp->z_seq = 0x7A4653; 655 zp->z_sync_cnt = 0; 656 657 vp = ZTOV(zp); 658 659 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl); 660 661 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8); 662 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8); 663 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 664 &zp->z_size, 8); 665 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 666 &zp->z_links, 8); 667 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 668 &zp->z_pflags, 8); 669 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8); 670 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 671 &zp->z_atime, 16); 672 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 673 &zp->z_uid, 8); 674 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 675 &zp->z_gid, 8); 676 677 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) { 678 if (hdl == NULL) 679 sa_handle_destroy(zp->z_sa_hdl); 680 zfs_vnode_forget(vp); 681 zp->z_vnode = NULL; 682 kmem_cache_free(znode_cache, zp); 683 return (NULL); 684 } 685 686 zp->z_mode = mode; 687 688 vp->v_type = IFTOVT((mode_t)mode); 689 690 switch (vp->v_type) { 691 case VDIR: 692 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ 693 break; 694#ifdef illumos 695 case VBLK: 696 case VCHR: 697 { 698 uint64_t rdev; 699 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), 700 &rdev, sizeof (rdev)) == 0); 701 702 vp->v_rdev = zfs_cmpldev(rdev); 703 } 704 break; 705#endif 706 case VFIFO: 707#ifdef illumos 708 case VSOCK: 709 case VDOOR: 710#endif 711 vp->v_op = &zfs_fifoops; 712 break; 713 case VREG: 714 if (parent == zfsvfs->z_shares_dir) { 715 ASSERT(zp->z_uid == 0 && zp->z_gid == 0); 716 vp->v_op = &zfs_shareops; 717 } 718 break; 719#ifdef illumos 720 case VLNK: 721 vn_setops(vp, zfs_symvnodeops); 722 break; 723 default: 724 vn_setops(vp, zfs_evnodeops); 725 break; 726#endif 727 } 728 729 mutex_enter(&zfsvfs->z_znodes_lock); 730 list_insert_tail(&zfsvfs->z_all_znodes, zp); 731 membar_producer(); 732 /* 733 * Everything else must be valid before assigning z_zfsvfs makes the 734 * znode eligible for zfs_znode_move(). 735 */ 736 zp->z_zfsvfs = zfsvfs; 737 mutex_exit(&zfsvfs->z_znodes_lock); 738 739 /* 740 * Acquire vnode lock before making it available to the world. 741 */ 742 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 743 VN_LOCK_AREC(vp); 744 if (vp->v_type != VFIFO) 745 VN_LOCK_ASHARE(vp); 746 747#ifdef illumos 748 VFS_HOLD(zfsvfs->z_vfs); 749#endif 750 return (zp); 751} 752 753static uint64_t empty_xattr; 754static uint64_t pad[4]; 755static zfs_acl_phys_t acl_phys; 756/* 757 * Create a new DMU object to hold a zfs znode. 758 * 759 * IN: dzp - parent directory for new znode 760 * vap - file attributes for new znode 761 * tx - dmu transaction id for zap operations 762 * cr - credentials of caller 763 * flag - flags: 764 * IS_ROOT_NODE - new object will be root 765 * IS_XATTR - new object is an attribute 766 * bonuslen - length of bonus buffer 767 * setaclp - File/Dir initial ACL 768 * fuidp - Tracks fuid allocation. 769 * 770 * OUT: zpp - allocated znode 771 * 772 */ 773void 774zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 775 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids) 776{ 777 uint64_t crtime[2], atime[2], mtime[2], ctime[2]; 778 uint64_t mode, size, links, parent, pflags; 779 uint64_t dzp_pflags = 0; 780 uint64_t rdev = 0; 781 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 782 dmu_buf_t *db; 783 timestruc_t now; 784 uint64_t gen, obj; 785 int err; 786 int bonuslen; 787 sa_handle_t *sa_hdl; 788 dmu_object_type_t obj_type; 789 sa_bulk_attr_t sa_attrs[ZPL_END]; 790 int cnt = 0; 791 zfs_acl_locator_cb_t locate = { 0 }; 792 793 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); 794 795 if (zfsvfs->z_replay) { 796 obj = vap->va_nodeid; 797 now = vap->va_ctime; /* see zfs_replay_create() */ 798 gen = vap->va_nblocks; /* ditto */ 799 } else { 800 obj = 0; 801 vfs_timestamp(&now); 802 gen = dmu_tx_get_txg(tx); 803 } 804 805 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE; 806 bonuslen = (obj_type == DMU_OT_SA) ? 807 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE; 808 809 /* 810 * Create a new DMU object. 811 */ 812 /* 813 * There's currently no mechanism for pre-reading the blocks that will 814 * be needed to allocate a new object, so we accept the small chance 815 * that there will be an i/o error and we will fail one of the 816 * assertions below. 817 */ 818 if (vap->va_type == VDIR) { 819 if (zfsvfs->z_replay) { 820 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj, 821 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 822 obj_type, bonuslen, tx)); 823 } else { 824 obj = zap_create_norm(zfsvfs->z_os, 825 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 826 obj_type, bonuslen, tx); 827 } 828 } else { 829 if (zfsvfs->z_replay) { 830 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj, 831 DMU_OT_PLAIN_FILE_CONTENTS, 0, 832 obj_type, bonuslen, tx)); 833 } else { 834 obj = dmu_object_alloc(zfsvfs->z_os, 835 DMU_OT_PLAIN_FILE_CONTENTS, 0, 836 obj_type, bonuslen, tx); 837 } 838 } 839 840 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 841 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db)); 842 843 /* 844 * If this is the root, fix up the half-initialized parent pointer 845 * to reference the just-allocated physical data area. 846 */ 847 if (flag & IS_ROOT_NODE) { 848 dzp->z_id = obj; 849 } else { 850 dzp_pflags = dzp->z_pflags; 851 } 852 853 /* 854 * If parent is an xattr, so am I. 855 */ 856 if (dzp_pflags & ZFS_XATTR) { 857 flag |= IS_XATTR; 858 } 859 860 if (zfsvfs->z_use_fuids) 861 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; 862 else 863 pflags = 0; 864 865 if (vap->va_type == VDIR) { 866 size = 2; /* contents ("." and "..") */ 867 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1; 868 } else { 869 size = links = 0; 870 } 871 872 if (vap->va_type == VBLK || vap->va_type == VCHR) { 873 rdev = zfs_expldev(vap->va_rdev); 874 } 875 876 parent = dzp->z_id; 877 mode = acl_ids->z_mode; 878 if (flag & IS_XATTR) 879 pflags |= ZFS_XATTR; 880 881 /* 882 * No execs denied will be deterimed when zfs_mode_compute() is called. 883 */ 884 pflags |= acl_ids->z_aclp->z_hints & 885 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT| 886 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED); 887 888 ZFS_TIME_ENCODE(&now, crtime); 889 ZFS_TIME_ENCODE(&now, ctime); 890 891 if (vap->va_mask & AT_ATIME) { 892 ZFS_TIME_ENCODE(&vap->va_atime, atime); 893 } else { 894 ZFS_TIME_ENCODE(&now, atime); 895 } 896 897 if (vap->va_mask & AT_MTIME) { 898 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 899 } else { 900 ZFS_TIME_ENCODE(&now, mtime); 901 } 902 903 /* Now add in all of the "SA" attributes */ 904 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED, 905 &sa_hdl)); 906 907 /* 908 * Setup the array of attributes to be replaced/set on the new file 909 * 910 * order for DMU_OT_ZNODE is critical since it needs to be constructed 911 * in the old znode_phys_t format. Don't change this ordering 912 */ 913 914 if (obj_type == DMU_OT_ZNODE) { 915 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 916 NULL, &atime, 16); 917 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 918 NULL, &mtime, 16); 919 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 920 NULL, &ctime, 16); 921 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 922 NULL, &crtime, 16); 923 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 924 NULL, &gen, 8); 925 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 926 NULL, &mode, 8); 927 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 928 NULL, &size, 8); 929 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 930 NULL, &parent, 8); 931 } else { 932 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 933 NULL, &mode, 8); 934 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 935 NULL, &size, 8); 936 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 937 NULL, &gen, 8); 938 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 939 &acl_ids->z_fuid, 8); 940 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 941 &acl_ids->z_fgid, 8); 942 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 943 NULL, &parent, 8); 944 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 945 NULL, &pflags, 8); 946 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 947 NULL, &atime, 16); 948 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 949 NULL, &mtime, 16); 950 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 951 NULL, &ctime, 16); 952 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 953 NULL, &crtime, 16); 954 } 955 956 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8); 957 958 if (obj_type == DMU_OT_ZNODE) { 959 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL, 960 &empty_xattr, 8); 961 } 962 if (obj_type == DMU_OT_ZNODE || 963 (vap->va_type == VBLK || vap->va_type == VCHR)) { 964 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs), 965 NULL, &rdev, 8); 966 967 } 968 if (obj_type == DMU_OT_ZNODE) { 969 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 970 NULL, &pflags, 8); 971 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 972 &acl_ids->z_fuid, 8); 973 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 974 &acl_ids->z_fgid, 8); 975 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad, 976 sizeof (uint64_t) * 4); 977 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL, 978 &acl_phys, sizeof (zfs_acl_phys_t)); 979 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) { 980 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL, 981 &acl_ids->z_aclp->z_acl_count, 8); 982 locate.cb_aclp = acl_ids->z_aclp; 983 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs), 984 zfs_acl_data_locator, &locate, 985 acl_ids->z_aclp->z_acl_bytes); 986 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags, 987 acl_ids->z_fuid, acl_ids->z_fgid); 988 } 989 990 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0); 991 992 if (!(flag & IS_ROOT_NODE)) { 993 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl); 994 ASSERT(*zpp != NULL); 995 } else { 996 /* 997 * If we are creating the root node, the "parent" we 998 * passed in is the znode for the root. 999 */ 1000 *zpp = dzp; 1001 1002 (*zpp)->z_sa_hdl = sa_hdl; 1003 } 1004 1005 (*zpp)->z_pflags = pflags; 1006 (*zpp)->z_mode = mode; 1007 1008 if (vap->va_mask & AT_XVATTR) 1009 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx); 1010 1011 if (obj_type == DMU_OT_ZNODE || 1012 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) { 1013 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx)); 1014 } 1015 if (!(flag & IS_ROOT_NODE)) { 1016 vnode_t *vp; 1017 1018 vp = ZTOV(*zpp); 1019 vp->v_vflag |= VV_FORCEINSMQ; 1020 err = insmntque(vp, zfsvfs->z_vfs); 1021 vp->v_vflag &= ~VV_FORCEINSMQ; 1022 KASSERT(err == 0, ("insmntque() failed: error %d", err)); 1023 } 1024 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1025} 1026 1027/* 1028 * Update in-core attributes. It is assumed the caller will be doing an 1029 * sa_bulk_update to push the changes out. 1030 */ 1031void 1032zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx) 1033{ 1034 xoptattr_t *xoap; 1035 1036 xoap = xva_getxoptattr(xvap); 1037 ASSERT(xoap); 1038 1039 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 1040 uint64_t times[2]; 1041 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times); 1042 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs), 1043 ×, sizeof (times), tx); 1044 XVA_SET_RTN(xvap, XAT_CREATETIME); 1045 } 1046 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 1047 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly, 1048 zp->z_pflags, tx); 1049 XVA_SET_RTN(xvap, XAT_READONLY); 1050 } 1051 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 1052 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden, 1053 zp->z_pflags, tx); 1054 XVA_SET_RTN(xvap, XAT_HIDDEN); 1055 } 1056 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 1057 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system, 1058 zp->z_pflags, tx); 1059 XVA_SET_RTN(xvap, XAT_SYSTEM); 1060 } 1061 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 1062 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive, 1063 zp->z_pflags, tx); 1064 XVA_SET_RTN(xvap, XAT_ARCHIVE); 1065 } 1066 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 1067 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable, 1068 zp->z_pflags, tx); 1069 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 1070 } 1071 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 1072 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink, 1073 zp->z_pflags, tx); 1074 XVA_SET_RTN(xvap, XAT_NOUNLINK); 1075 } 1076 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 1077 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly, 1078 zp->z_pflags, tx); 1079 XVA_SET_RTN(xvap, XAT_APPENDONLY); 1080 } 1081 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 1082 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump, 1083 zp->z_pflags, tx); 1084 XVA_SET_RTN(xvap, XAT_NODUMP); 1085 } 1086 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 1087 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque, 1088 zp->z_pflags, tx); 1089 XVA_SET_RTN(xvap, XAT_OPAQUE); 1090 } 1091 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 1092 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED, 1093 xoap->xoa_av_quarantined, zp->z_pflags, tx); 1094 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 1095 } 1096 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 1097 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified, 1098 zp->z_pflags, tx); 1099 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 1100 } 1101 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { 1102 zfs_sa_set_scanstamp(zp, xvap, tx); 1103 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); 1104 } 1105 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 1106 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse, 1107 zp->z_pflags, tx); 1108 XVA_SET_RTN(xvap, XAT_REPARSE); 1109 } 1110 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 1111 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline, 1112 zp->z_pflags, tx); 1113 XVA_SET_RTN(xvap, XAT_OFFLINE); 1114 } 1115 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 1116 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse, 1117 zp->z_pflags, tx); 1118 XVA_SET_RTN(xvap, XAT_SPARSE); 1119 } 1120} 1121 1122int 1123zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 1124{ 1125 dmu_object_info_t doi; 1126 dmu_buf_t *db; 1127 znode_t *zp; 1128 vnode_t *vp; 1129 sa_handle_t *hdl; 1130 struct thread *td; 1131 int locked; 1132 int err; 1133 1134 td = curthread; 1135 getnewvnode_reserve(1); 1136again: 1137 *zpp = NULL; 1138 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1139 1140 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1141 if (err) { 1142 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1143 getnewvnode_drop_reserve(); 1144 return (err); 1145 } 1146 1147 dmu_object_info_from_db(db, &doi); 1148 if (doi.doi_bonus_type != DMU_OT_SA && 1149 (doi.doi_bonus_type != DMU_OT_ZNODE || 1150 (doi.doi_bonus_type == DMU_OT_ZNODE && 1151 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1152 sa_buf_rele(db, NULL); 1153 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1154#ifdef __FreeBSD__ 1155 getnewvnode_drop_reserve(); 1156#endif 1157 return (SET_ERROR(EINVAL)); 1158 } 1159 1160 hdl = dmu_buf_get_user(db); 1161 if (hdl != NULL) { 1162 zp = sa_get_userdata(hdl); 1163 1164 1165 /* 1166 * Since "SA" does immediate eviction we 1167 * should never find a sa handle that doesn't 1168 * know about the znode. 1169 */ 1170 1171 ASSERT3P(zp, !=, NULL); 1172 1173 mutex_enter(&zp->z_lock); 1174 ASSERT3U(zp->z_id, ==, obj_num); 1175 if (zp->z_unlinked) { 1176 err = SET_ERROR(ENOENT); 1177 } else { 1178 vp = ZTOV(zp); 1179 *zpp = zp; 1180 err = 0; 1181 } 1182 1183 /* Don't let the vnode disappear after ZFS_OBJ_HOLD_EXIT. */ 1184 if (err == 0) 1185 VN_HOLD(vp); 1186 1187 mutex_exit(&zp->z_lock); 1188 sa_buf_rele(db, NULL); 1189 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1190 1191 if (err == 0) { 1192 locked = VOP_ISLOCKED(vp); 1193 VI_LOCK(vp); 1194 if ((vp->v_iflag & VI_DOOMED) != 0 && 1195 locked != LK_EXCLUSIVE) { 1196 /* 1197 * The vnode is doomed and this thread doesn't 1198 * hold the exclusive lock on it, so the vnode 1199 * must be being reclaimed by another thread. 1200 * Otherwise the doomed vnode is being reclaimed 1201 * by this thread and zfs_zget is called from 1202 * ZIL internals. 1203 */ 1204 VI_UNLOCK(vp); 1205 VN_RELE(vp); 1206 goto again; 1207 } 1208 VI_UNLOCK(vp); 1209 } 1210 getnewvnode_drop_reserve(); 1211 return (err); 1212 } 1213 1214 /* 1215 * Not found create new znode/vnode 1216 * but only if file exists. 1217 * 1218 * There is a small window where zfs_vget() could 1219 * find this object while a file create is still in 1220 * progress. This is checked for in zfs_znode_alloc() 1221 * 1222 * if zfs_znode_alloc() fails it will drop the hold on the 1223 * bonus buffer. 1224 */ 1225 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size, 1226 doi.doi_bonus_type, NULL); 1227 if (zp == NULL) { 1228 err = SET_ERROR(ENOENT); 1229 } else { 1230 *zpp = zp; 1231 } 1232 if (err == 0) { 1233 vnode_t *vp = ZTOV(zp); 1234 1235 err = insmntque(vp, zfsvfs->z_vfs); 1236 if (err == 0) { 1237 vp->v_hash = obj_num; 1238 VOP_UNLOCK(vp, 0); 1239 } else { 1240 zp->z_vnode = NULL; 1241 zfs_znode_dmu_fini(zp); 1242 zfs_znode_free(zp); 1243 *zpp = NULL; 1244 } 1245 } 1246 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1247 getnewvnode_drop_reserve(); 1248 return (err); 1249} 1250 1251int 1252zfs_rezget(znode_t *zp) 1253{ 1254 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1255 dmu_object_info_t doi; 1256 dmu_buf_t *db; 1257 vnode_t *vp; 1258 uint64_t obj_num = zp->z_id; 1259 uint64_t mode, size; 1260 sa_bulk_attr_t bulk[8]; 1261 int err; 1262 int count = 0; 1263 uint64_t gen; 1264 1265 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1266 1267 mutex_enter(&zp->z_acl_lock); 1268 if (zp->z_acl_cached) { 1269 zfs_acl_free(zp->z_acl_cached); 1270 zp->z_acl_cached = NULL; 1271 } 1272 1273 mutex_exit(&zp->z_acl_lock); 1274 ASSERT(zp->z_sa_hdl == NULL); 1275 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1276 if (err) { 1277 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1278 return (err); 1279 } 1280 1281 dmu_object_info_from_db(db, &doi); 1282 if (doi.doi_bonus_type != DMU_OT_SA && 1283 (doi.doi_bonus_type != DMU_OT_ZNODE || 1284 (doi.doi_bonus_type == DMU_OT_ZNODE && 1285 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1286 sa_buf_rele(db, NULL); 1287 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1288 return (SET_ERROR(EINVAL)); 1289 } 1290 1291 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL); 1292 size = zp->z_size; 1293 1294 /* reload cached values */ 1295 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, 1296 &gen, sizeof (gen)); 1297 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 1298 &zp->z_size, sizeof (zp->z_size)); 1299 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 1300 &zp->z_links, sizeof (zp->z_links)); 1301 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 1302 &zp->z_pflags, sizeof (zp->z_pflags)); 1303 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 1304 &zp->z_atime, sizeof (zp->z_atime)); 1305 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 1306 &zp->z_uid, sizeof (zp->z_uid)); 1307 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 1308 &zp->z_gid, sizeof (zp->z_gid)); 1309 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 1310 &mode, sizeof (mode)); 1311 1312 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) { 1313 zfs_znode_dmu_fini(zp); 1314 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1315 return (SET_ERROR(EIO)); 1316 } 1317 1318 zp->z_mode = mode; 1319 1320 if (gen != zp->z_gen) { 1321 zfs_znode_dmu_fini(zp); 1322 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1323 return (SET_ERROR(EIO)); 1324 } 1325 1326 /* 1327 * It is highly improbable but still quite possible that two 1328 * objects in different datasets are created with the same 1329 * object numbers and in transaction groups with the same 1330 * numbers. znodes corresponding to those objects would 1331 * have the same z_id and z_gen, but their other attributes 1332 * may be different. 1333 * zfs recv -F may replace one of such objects with the other. 1334 * As a result file properties recorded in the replaced 1335 * object's vnode may no longer match the received object's 1336 * properties. At present the only cached property is the 1337 * files type recorded in v_type. 1338 * So, handle this case by leaving the old vnode and znode 1339 * disassociated from the actual object. A new vnode and a 1340 * znode will be created if the object is accessed 1341 * (e.g. via a look-up). The old vnode and znode will be 1342 * recycled when the last vnode reference is dropped. 1343 */ 1344 vp = ZTOV(zp); 1345 if (vp->v_type != IFTOVT((mode_t)zp->z_mode)) { 1346 zfs_znode_dmu_fini(zp); 1347 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1348 return (EIO); 1349 } 1350 1351 zp->z_unlinked = (zp->z_links == 0); 1352 zp->z_blksz = doi.doi_data_block_size; 1353 vn_pages_remove(vp, 0, 0); 1354 if (zp->z_size != size) 1355 vnode_pager_setsize(vp, zp->z_size); 1356 1357 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1358 1359 return (0); 1360} 1361 1362void 1363zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) 1364{ 1365 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1366 objset_t *os = zfsvfs->z_os; 1367 uint64_t obj = zp->z_id; 1368 uint64_t acl_obj = zfs_external_acl(zp); 1369 1370 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 1371 if (acl_obj) { 1372 VERIFY(!zp->z_is_sa); 1373 VERIFY(0 == dmu_object_free(os, acl_obj, tx)); 1374 } 1375 VERIFY(0 == dmu_object_free(os, obj, tx)); 1376 zfs_znode_dmu_fini(zp); 1377 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1378 zfs_znode_free(zp); 1379} 1380 1381void 1382zfs_zinactive(znode_t *zp) 1383{ 1384 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1385 uint64_t z_id = zp->z_id; 1386 1387 ASSERT(zp->z_sa_hdl); 1388 1389 /* 1390 * Don't allow a zfs_zget() while were trying to release this znode 1391 */ 1392 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); 1393 1394 mutex_enter(&zp->z_lock); 1395 1396 /* 1397 * If this was the last reference to a file with no links, 1398 * remove the file from the file system. 1399 */ 1400 if (zp->z_unlinked) { 1401 mutex_exit(&zp->z_lock); 1402 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1403 zfs_rmnode(zp); 1404 return; 1405 } 1406 1407 mutex_exit(&zp->z_lock); 1408 zfs_znode_dmu_fini(zp); 1409 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1410 zfs_znode_free(zp); 1411} 1412 1413void 1414zfs_znode_free(znode_t *zp) 1415{ 1416 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1417 1418 ASSERT(zp->z_sa_hdl == NULL); 1419 zp->z_vnode = NULL; 1420 mutex_enter(&zfsvfs->z_znodes_lock); 1421 POINTER_INVALIDATE(&zp->z_zfsvfs); 1422 list_remove(&zfsvfs->z_all_znodes, zp); 1423 mutex_exit(&zfsvfs->z_znodes_lock); 1424 1425 if (zp->z_acl_cached) { 1426 zfs_acl_free(zp->z_acl_cached); 1427 zp->z_acl_cached = NULL; 1428 } 1429 1430 kmem_cache_free(znode_cache, zp); 1431 1432#ifdef illumos 1433 VFS_RELE(zfsvfs->z_vfs); 1434#endif 1435} 1436 1437void 1438zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2], 1439 uint64_t ctime[2], boolean_t have_tx) 1440{ 1441 timestruc_t now; 1442 1443 vfs_timestamp(&now); 1444 1445 if (have_tx) { /* will sa_bulk_update happen really soon? */ 1446 zp->z_atime_dirty = 0; 1447 zp->z_seq++; 1448 } else { 1449 zp->z_atime_dirty = 1; 1450 } 1451 1452 if (flag & AT_ATIME) { 1453 ZFS_TIME_ENCODE(&now, zp->z_atime); 1454 } 1455 1456 if (flag & AT_MTIME) { 1457 ZFS_TIME_ENCODE(&now, mtime); 1458 if (zp->z_zfsvfs->z_use_fuids) { 1459 zp->z_pflags |= (ZFS_ARCHIVE | 1460 ZFS_AV_MODIFIED); 1461 } 1462 } 1463 1464 if (flag & AT_CTIME) { 1465 ZFS_TIME_ENCODE(&now, ctime); 1466 if (zp->z_zfsvfs->z_use_fuids) 1467 zp->z_pflags |= ZFS_ARCHIVE; 1468 } 1469} 1470 1471/* 1472 * Grow the block size for a file. 1473 * 1474 * IN: zp - znode of file to free data in. 1475 * size - requested block size 1476 * tx - open transaction. 1477 * 1478 * NOTE: this function assumes that the znode is write locked. 1479 */ 1480void 1481zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx) 1482{ 1483 int error; 1484 u_longlong_t dummy; 1485 1486 if (size <= zp->z_blksz) 1487 return; 1488 /* 1489 * If the file size is already greater than the current blocksize, 1490 * we will not grow. If there is more than one block in a file, 1491 * the blocksize cannot change. 1492 */ 1493 if (zp->z_blksz && zp->z_size > zp->z_blksz) 1494 return; 1495 1496 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id, 1497 size, 0, tx); 1498 1499 if (error == ENOTSUP) 1500 return; 1501 ASSERT0(error); 1502 1503 /* What blocksize did we actually get? */ 1504 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy); 1505} 1506 1507#ifdef illumos 1508/* 1509 * This is a dummy interface used when pvn_vplist_dirty() should *not* 1510 * be calling back into the fs for a putpage(). E.g.: when truncating 1511 * a file, the pages being "thrown away* don't need to be written out. 1512 */ 1513/* ARGSUSED */ 1514static int 1515zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, 1516 int flags, cred_t *cr) 1517{ 1518 ASSERT(0); 1519 return (0); 1520} 1521#endif 1522 1523/* 1524 * Increase the file length 1525 * 1526 * IN: zp - znode of file to free data in. 1527 * end - new end-of-file 1528 * 1529 * RETURN: 0 on success, error code on failure 1530 */ 1531static int 1532zfs_extend(znode_t *zp, uint64_t end) 1533{ 1534 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1535 dmu_tx_t *tx; 1536 rl_t *rl; 1537 uint64_t newblksz; 1538 int error; 1539 1540 /* 1541 * We will change zp_size, lock the whole file. 1542 */ 1543 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1544 1545 /* 1546 * Nothing to do if file already at desired length. 1547 */ 1548 if (end <= zp->z_size) { 1549 zfs_range_unlock(rl); 1550 return (0); 1551 } 1552 tx = dmu_tx_create(zfsvfs->z_os); 1553 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1554 zfs_sa_upgrade_txholds(tx, zp); 1555 if (end > zp->z_blksz && 1556 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) { 1557 /* 1558 * We are growing the file past the current block size. 1559 */ 1560 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) { 1561 /* 1562 * File's blocksize is already larger than the 1563 * "recordsize" property. Only let it grow to 1564 * the next power of 2. 1565 */ 1566 ASSERT(!ISP2(zp->z_blksz)); 1567 newblksz = MIN(end, 1 << highbit64(zp->z_blksz)); 1568 } else { 1569 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz); 1570 } 1571 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); 1572 } else { 1573 newblksz = 0; 1574 } 1575 1576 error = dmu_tx_assign(tx, TXG_WAIT); 1577 if (error) { 1578 dmu_tx_abort(tx); 1579 zfs_range_unlock(rl); 1580 return (error); 1581 } 1582 1583 if (newblksz) 1584 zfs_grow_blocksize(zp, newblksz, tx); 1585 1586 zp->z_size = end; 1587 1588 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs), 1589 &zp->z_size, sizeof (zp->z_size), tx)); 1590 1591 vnode_pager_setsize(ZTOV(zp), end); 1592 1593 zfs_range_unlock(rl); 1594 1595 dmu_tx_commit(tx); 1596 1597 return (0); 1598} 1599 1600/* 1601 * Free space in a file. 1602 * 1603 * IN: zp - znode of file to free data in. 1604 * off - start of section to free. 1605 * len - length of section to free. 1606 * 1607 * RETURN: 0 on success, error code on failure 1608 */ 1609static int 1610zfs_free_range(znode_t *zp, uint64_t off, uint64_t len) 1611{ 1612 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1613 rl_t *rl; 1614 int error; 1615 1616 /* 1617 * Lock the range being freed. 1618 */ 1619 rl = zfs_range_lock(zp, off, len, RL_WRITER); 1620 1621 /* 1622 * Nothing to do if file already at desired length. 1623 */ 1624 if (off >= zp->z_size) { 1625 zfs_range_unlock(rl); 1626 return (0); 1627 } 1628 1629 if (off + len > zp->z_size) 1630 len = zp->z_size - off; 1631 1632 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len); 1633 1634 if (error == 0) { 1635 /* 1636 * In FreeBSD we cannot free block in the middle of a file, 1637 * but only at the end of a file, so this code path should 1638 * never happen. 1639 */ 1640 vnode_pager_setsize(ZTOV(zp), off); 1641 } 1642 1643 zfs_range_unlock(rl); 1644 1645 return (error); 1646} 1647 1648/* 1649 * Truncate a file 1650 * 1651 * IN: zp - znode of file to free data in. 1652 * end - new end-of-file. 1653 * 1654 * RETURN: 0 on success, error code on failure 1655 */ 1656static int 1657zfs_trunc(znode_t *zp, uint64_t end) 1658{ 1659 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1660 vnode_t *vp = ZTOV(zp); 1661 dmu_tx_t *tx; 1662 rl_t *rl; 1663 int error; 1664 sa_bulk_attr_t bulk[2]; 1665 int count = 0; 1666 1667 /* 1668 * We will change zp_size, lock the whole file. 1669 */ 1670 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1671 1672 /* 1673 * Nothing to do if file already at desired length. 1674 */ 1675 if (end >= zp->z_size) { 1676 zfs_range_unlock(rl); 1677 return (0); 1678 } 1679 1680 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1); 1681 if (error) { 1682 zfs_range_unlock(rl); 1683 return (error); 1684 } 1685 tx = dmu_tx_create(zfsvfs->z_os); 1686 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1687 zfs_sa_upgrade_txholds(tx, zp); 1688 dmu_tx_mark_netfree(tx); 1689 error = dmu_tx_assign(tx, TXG_WAIT); 1690 if (error) { 1691 dmu_tx_abort(tx); 1692 zfs_range_unlock(rl); 1693 return (error); 1694 } 1695 1696 zp->z_size = end; 1697 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), 1698 NULL, &zp->z_size, sizeof (zp->z_size)); 1699 1700 if (end == 0) { 1701 zp->z_pflags &= ~ZFS_SPARSE; 1702 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1703 NULL, &zp->z_pflags, 8); 1704 } 1705 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0); 1706 1707 dmu_tx_commit(tx); 1708 1709 /* 1710 * Clear any mapped pages in the truncated region. This has to 1711 * happen outside of the transaction to avoid the possibility of 1712 * a deadlock with someone trying to push a page that we are 1713 * about to invalidate. 1714 */ 1715 vnode_pager_setsize(vp, end); 1716 1717 zfs_range_unlock(rl); 1718 1719 return (0); 1720} 1721 1722/* 1723 * Free space in a file 1724 * 1725 * IN: zp - znode of file to free data in. 1726 * off - start of range 1727 * len - end of range (0 => EOF) 1728 * flag - current file open mode flags. 1729 * log - TRUE if this action should be logged 1730 * 1731 * RETURN: 0 on success, error code on failure 1732 */ 1733int 1734zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) 1735{ 1736 vnode_t *vp = ZTOV(zp); 1737 dmu_tx_t *tx; 1738 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1739 zilog_t *zilog = zfsvfs->z_log; 1740 uint64_t mode; 1741 uint64_t mtime[2], ctime[2]; 1742 sa_bulk_attr_t bulk[3]; 1743 int count = 0; 1744 int error; 1745 1746 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode, 1747 sizeof (mode))) != 0) 1748 return (error); 1749 1750 if (off > zp->z_size) { 1751 error = zfs_extend(zp, off+len); 1752 if (error == 0 && log) 1753 goto log; 1754 else 1755 return (error); 1756 } 1757 1758 /* 1759 * Check for any locks in the region to be freed. 1760 */ 1761 1762 if (MANDLOCK(vp, (mode_t)mode)) { 1763 uint64_t length = (len ? len : zp->z_size - off); 1764 if (error = chklock(vp, FWRITE, off, length, flag, NULL)) 1765 return (error); 1766 } 1767 1768 if (len == 0) { 1769 error = zfs_trunc(zp, off); 1770 } else { 1771 if ((error = zfs_free_range(zp, off, len)) == 0 && 1772 off + len > zp->z_size) 1773 error = zfs_extend(zp, off+len); 1774 } 1775 if (error || !log) 1776 return (error); 1777log: 1778 tx = dmu_tx_create(zfsvfs->z_os); 1779 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1780 zfs_sa_upgrade_txholds(tx, zp); 1781 error = dmu_tx_assign(tx, TXG_WAIT); 1782 if (error) { 1783 dmu_tx_abort(tx); 1784 return (error); 1785 } 1786 1787 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16); 1788 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16); 1789 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1790 NULL, &zp->z_pflags, 8); 1791 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); 1792 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 1793 ASSERT(error == 0); 1794 1795 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); 1796 1797 dmu_tx_commit(tx); 1798 return (0); 1799} 1800 1801void 1802zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) 1803{ 1804 uint64_t moid, obj, sa_obj, version; 1805 uint64_t sense = ZFS_CASE_SENSITIVE; 1806 uint64_t norm = 0; 1807 nvpair_t *elem; 1808 int error; 1809 int i; 1810 znode_t *rootzp = NULL; 1811 zfsvfs_t *zfsvfs; 1812 vattr_t vattr; 1813 znode_t *zp; 1814 zfs_acl_ids_t acl_ids; 1815 1816 /* 1817 * First attempt to create master node. 1818 */ 1819 /* 1820 * In an empty objset, there are no blocks to read and thus 1821 * there can be no i/o errors (which we assert below). 1822 */ 1823 moid = MASTER_NODE_OBJ; 1824 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE, 1825 DMU_OT_NONE, 0, tx); 1826 ASSERT(error == 0); 1827 1828 /* 1829 * Set starting attributes. 1830 */ 1831 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os))); 1832 elem = NULL; 1833 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) { 1834 /* For the moment we expect all zpl props to be uint64_ts */ 1835 uint64_t val; 1836 char *name; 1837 1838 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64); 1839 VERIFY(nvpair_value_uint64(elem, &val) == 0); 1840 name = nvpair_name(elem); 1841 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) { 1842 if (val < version) 1843 version = val; 1844 } else { 1845 error = zap_update(os, moid, name, 8, 1, &val, tx); 1846 } 1847 ASSERT(error == 0); 1848 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0) 1849 norm = val; 1850 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0) 1851 sense = val; 1852 } 1853 ASSERT(version != 0); 1854 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx); 1855 1856 /* 1857 * Create zap object used for SA attribute registration 1858 */ 1859 1860 if (version >= ZPL_VERSION_SA) { 1861 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 1862 DMU_OT_NONE, 0, tx); 1863 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 1864 ASSERT(error == 0); 1865 } else { 1866 sa_obj = 0; 1867 } 1868 /* 1869 * Create a delete queue. 1870 */ 1871 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); 1872 1873 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx); 1874 ASSERT(error == 0); 1875 1876 /* 1877 * Create root znode. Create minimal znode/vnode/zfsvfs 1878 * to allow zfs_mknode to work. 1879 */ 1880 VATTR_NULL(&vattr); 1881 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 1882 vattr.va_type = VDIR; 1883 vattr.va_mode = S_IFDIR|0755; 1884 vattr.va_uid = crgetuid(cr); 1885 vattr.va_gid = crgetgid(cr); 1886 1887 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 1888 1889 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP); 1890 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs)); 1891 rootzp->z_moved = 0; 1892 rootzp->z_unlinked = 0; 1893 rootzp->z_atime_dirty = 0; 1894 rootzp->z_is_sa = USE_SA(version, os); 1895 1896 zfsvfs->z_os = os; 1897 zfsvfs->z_parent = zfsvfs; 1898 zfsvfs->z_version = version; 1899 zfsvfs->z_use_fuids = USE_FUIDS(version, os); 1900 zfsvfs->z_use_sa = USE_SA(version, os); 1901 zfsvfs->z_norm = norm; 1902 1903 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 1904 &zfsvfs->z_attr_table); 1905 1906 ASSERT(error == 0); 1907 1908 /* 1909 * Fold case on file systems that are always or sometimes case 1910 * insensitive. 1911 */ 1912 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED) 1913 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 1914 1915 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 1916 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 1917 offsetof(znode_t, z_link_node)); 1918 1919 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1920 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 1921 1922 rootzp->z_zfsvfs = zfsvfs; 1923 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr, 1924 cr, NULL, &acl_ids)); 1925 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids); 1926 ASSERT3P(zp, ==, rootzp); 1927 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); 1928 ASSERT(error == 0); 1929 zfs_acl_ids_free(&acl_ids); 1930 POINTER_INVALIDATE(&rootzp->z_zfsvfs); 1931 1932 sa_handle_destroy(rootzp->z_sa_hdl); 1933 kmem_cache_free(znode_cache, rootzp); 1934 1935 /* 1936 * Create shares directory 1937 */ 1938 1939 error = zfs_create_share_dir(zfsvfs, tx); 1940 1941 ASSERT(error == 0); 1942 1943 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1944 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1945 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1946} 1947 1948#endif /* _KERNEL */ 1949 1950static int 1951zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table) 1952{ 1953 uint64_t sa_obj = 0; 1954 int error; 1955 1956 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj); 1957 if (error != 0 && error != ENOENT) 1958 return (error); 1959 1960 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table); 1961 return (error); 1962} 1963 1964static int 1965zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp, 1966 dmu_buf_t **db, void *tag) 1967{ 1968 dmu_object_info_t doi; 1969 int error; 1970 1971 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0) 1972 return (error); 1973 1974 dmu_object_info_from_db(*db, &doi); 1975 if ((doi.doi_bonus_type != DMU_OT_SA && 1976 doi.doi_bonus_type != DMU_OT_ZNODE) || 1977 doi.doi_bonus_type == DMU_OT_ZNODE && 1978 doi.doi_bonus_size < sizeof (znode_phys_t)) { 1979 sa_buf_rele(*db, tag); 1980 return (SET_ERROR(ENOTSUP)); 1981 } 1982 1983 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp); 1984 if (error != 0) { 1985 sa_buf_rele(*db, tag); 1986 return (error); 1987 } 1988 1989 return (0); 1990} 1991 1992void 1993zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag) 1994{ 1995 sa_handle_destroy(hdl); 1996 sa_buf_rele(db, tag); 1997} 1998 1999/* 2000 * Given an object number, return its parent object number and whether 2001 * or not the object is an extended attribute directory. 2002 */ 2003static int 2004zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table, 2005 uint64_t *pobjp, int *is_xattrdir) 2006{ 2007 uint64_t parent; 2008 uint64_t pflags; 2009 uint64_t mode; 2010 uint64_t parent_mode; 2011 sa_bulk_attr_t bulk[3]; 2012 sa_handle_t *sa_hdl; 2013 dmu_buf_t *sa_db; 2014 int count = 0; 2015 int error; 2016 2017 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL, 2018 &parent, sizeof (parent)); 2019 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL, 2020 &pflags, sizeof (pflags)); 2021 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2022 &mode, sizeof (mode)); 2023 2024 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0) 2025 return (error); 2026 2027 /* 2028 * When a link is removed its parent pointer is not changed and will 2029 * be invalid. There are two cases where a link is removed but the 2030 * file stays around, when it goes to the delete queue and when there 2031 * are additional links. 2032 */ 2033 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG); 2034 if (error != 0) 2035 return (error); 2036 2037 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode)); 2038 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2039 if (error != 0) 2040 return (error); 2041 2042 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode); 2043 2044 /* 2045 * Extended attributes can be applied to files, directories, etc. 2046 * Otherwise the parent must be a directory. 2047 */ 2048 if (!*is_xattrdir && !S_ISDIR(parent_mode)) 2049 return (SET_ERROR(EINVAL)); 2050 2051 *pobjp = parent; 2052 2053 return (0); 2054} 2055 2056/* 2057 * Given an object number, return some zpl level statistics 2058 */ 2059static int 2060zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table, 2061 zfs_stat_t *sb) 2062{ 2063 sa_bulk_attr_t bulk[4]; 2064 int count = 0; 2065 2066 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2067 &sb->zs_mode, sizeof (sb->zs_mode)); 2068 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL, 2069 &sb->zs_gen, sizeof (sb->zs_gen)); 2070 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL, 2071 &sb->zs_links, sizeof (sb->zs_links)); 2072 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL, 2073 &sb->zs_ctime, sizeof (sb->zs_ctime)); 2074 2075 return (sa_bulk_lookup(hdl, bulk, count)); 2076} 2077 2078static int 2079zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl, 2080 sa_attr_type_t *sa_table, char *buf, int len) 2081{ 2082 sa_handle_t *sa_hdl; 2083 sa_handle_t *prevhdl = NULL; 2084 dmu_buf_t *prevdb = NULL; 2085 dmu_buf_t *sa_db = NULL; 2086 char *path = buf + len - 1; 2087 int error; 2088 2089 *path = '\0'; 2090 sa_hdl = hdl; 2091 2092 for (;;) { 2093 uint64_t pobj; 2094 char component[MAXNAMELEN + 2]; 2095 size_t complen; 2096 int is_xattrdir; 2097 2098 if (prevdb) 2099 zfs_release_sa_handle(prevhdl, prevdb, FTAG); 2100 2101 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj, 2102 &is_xattrdir)) != 0) 2103 break; 2104 2105 if (pobj == obj) { 2106 if (path[0] != '/') 2107 *--path = '/'; 2108 break; 2109 } 2110 2111 component[0] = '/'; 2112 if (is_xattrdir) { 2113 (void) sprintf(component + 1, "<xattrdir>"); 2114 } else { 2115 error = zap_value_search(osp, pobj, obj, 2116 ZFS_DIRENT_OBJ(-1ULL), component + 1); 2117 if (error != 0) 2118 break; 2119 } 2120 2121 complen = strlen(component); 2122 path -= complen; 2123 ASSERT(path >= buf); 2124 bcopy(component, path, complen); 2125 obj = pobj; 2126 2127 if (sa_hdl != hdl) { 2128 prevhdl = sa_hdl; 2129 prevdb = sa_db; 2130 } 2131 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG); 2132 if (error != 0) { 2133 sa_hdl = prevhdl; 2134 sa_db = prevdb; 2135 break; 2136 } 2137 } 2138 2139 if (sa_hdl != NULL && sa_hdl != hdl) { 2140 ASSERT(sa_db != NULL); 2141 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2142 } 2143 2144 if (error == 0) 2145 (void) memmove(buf, path, buf + len - path); 2146 2147 return (error); 2148} 2149 2150int 2151zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) 2152{ 2153 sa_attr_type_t *sa_table; 2154 sa_handle_t *hdl; 2155 dmu_buf_t *db; 2156 int error; 2157 2158 error = zfs_sa_setup(osp, &sa_table); 2159 if (error != 0) 2160 return (error); 2161 2162 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2163 if (error != 0) 2164 return (error); 2165 2166 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2167 2168 zfs_release_sa_handle(hdl, db, FTAG); 2169 return (error); 2170} 2171 2172int 2173zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb, 2174 char *buf, int len) 2175{ 2176 char *path = buf + len - 1; 2177 sa_attr_type_t *sa_table; 2178 sa_handle_t *hdl; 2179 dmu_buf_t *db; 2180 int error; 2181 2182 *path = '\0'; 2183 2184 error = zfs_sa_setup(osp, &sa_table); 2185 if (error != 0) 2186 return (error); 2187 2188 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2189 if (error != 0) 2190 return (error); 2191 2192 error = zfs_obj_to_stats_impl(hdl, sa_table, sb); 2193 if (error != 0) { 2194 zfs_release_sa_handle(hdl, db, FTAG); 2195 return (error); 2196 } 2197 2198 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2199 2200 zfs_release_sa_handle(hdl, db, FTAG); 2201 return (error); 2202} 2203