zfs_znode.c revision 324005
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_acl_lock, NULL, MUTEX_DEFAULT, NULL); 128 129 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL); 130 avl_create(&zp->z_range_avl, zfs_range_compare, 131 sizeof (rl_t), offsetof(rl_t, r_node)); 132 133 zp->z_acl_cached = NULL; 134 zp->z_vnode = NULL; 135 zp->z_moved = 0; 136 return (0); 137} 138 139/*ARGSUSED*/ 140static void 141zfs_znode_cache_destructor(void *buf, void *arg) 142{ 143 znode_t *zp = buf; 144 145 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 146 ASSERT3P(zp->z_vnode, ==, NULL); 147 ASSERT(!list_link_active(&zp->z_link_node)); 148 mutex_destroy(&zp->z_acl_lock); 149 avl_destroy(&zp->z_range_avl); 150 mutex_destroy(&zp->z_range_lock); 151 152 ASSERT(zp->z_acl_cached == NULL); 153} 154 155#ifdef ZNODE_STATS 156static struct { 157 uint64_t zms_zfsvfs_invalid; 158 uint64_t zms_zfsvfs_recheck1; 159 uint64_t zms_zfsvfs_unmounted; 160 uint64_t zms_zfsvfs_recheck2; 161 uint64_t zms_obj_held; 162 uint64_t zms_vnode_locked; 163 uint64_t zms_not_only_dnlc; 164} znode_move_stats; 165#endif /* ZNODE_STATS */ 166 167#ifdef illumos 168static void 169zfs_znode_move_impl(znode_t *ozp, znode_t *nzp) 170{ 171 vnode_t *vp; 172 173 /* Copy fields. */ 174 nzp->z_zfsvfs = ozp->z_zfsvfs; 175 176 /* Swap vnodes. */ 177 vp = nzp->z_vnode; 178 nzp->z_vnode = ozp->z_vnode; 179 ozp->z_vnode = vp; /* let destructor free the overwritten vnode */ 180 ZTOV(ozp)->v_data = ozp; 181 ZTOV(nzp)->v_data = nzp; 182 183 nzp->z_id = ozp->z_id; 184 ASSERT(ozp->z_dirlocks == NULL); /* znode not in use */ 185 ASSERT(avl_numnodes(&ozp->z_range_avl) == 0); 186 nzp->z_unlinked = ozp->z_unlinked; 187 nzp->z_atime_dirty = ozp->z_atime_dirty; 188 nzp->z_zn_prefetch = ozp->z_zn_prefetch; 189 nzp->z_blksz = ozp->z_blksz; 190 nzp->z_seq = ozp->z_seq; 191 nzp->z_mapcnt = ozp->z_mapcnt; 192 nzp->z_gen = ozp->z_gen; 193 nzp->z_sync_cnt = ozp->z_sync_cnt; 194 nzp->z_is_sa = ozp->z_is_sa; 195 nzp->z_sa_hdl = ozp->z_sa_hdl; 196 bcopy(ozp->z_atime, nzp->z_atime, sizeof (uint64_t) * 2); 197 nzp->z_links = ozp->z_links; 198 nzp->z_size = ozp->z_size; 199 nzp->z_pflags = ozp->z_pflags; 200 nzp->z_uid = ozp->z_uid; 201 nzp->z_gid = ozp->z_gid; 202 nzp->z_mode = ozp->z_mode; 203 204 /* 205 * Since this is just an idle znode and kmem is already dealing with 206 * memory pressure, release any cached ACL. 207 */ 208 if (ozp->z_acl_cached) { 209 zfs_acl_free(ozp->z_acl_cached); 210 ozp->z_acl_cached = NULL; 211 } 212 213 sa_set_userp(nzp->z_sa_hdl, nzp); 214 215 /* 216 * Invalidate the original znode by clearing fields that provide a 217 * pointer back to the znode. Set the low bit of the vfs pointer to 218 * ensure that zfs_znode_move() recognizes the znode as invalid in any 219 * subsequent callback. 220 */ 221 ozp->z_sa_hdl = NULL; 222 POINTER_INVALIDATE(&ozp->z_zfsvfs); 223 224 /* 225 * Mark the znode. 226 */ 227 nzp->z_moved = 1; 228 ozp->z_moved = (uint8_t)-1; 229} 230 231/*ARGSUSED*/ 232static kmem_cbrc_t 233zfs_znode_move(void *buf, void *newbuf, size_t size, void *arg) 234{ 235 znode_t *ozp = buf, *nzp = newbuf; 236 zfsvfs_t *zfsvfs; 237 vnode_t *vp; 238 239 /* 240 * The znode is on the file system's list of known znodes if the vfs 241 * pointer is valid. We set the low bit of the vfs pointer when freeing 242 * the znode to invalidate it, and the memory patterns written by kmem 243 * (baddcafe and deadbeef) set at least one of the two low bits. A newly 244 * created znode sets the vfs pointer last of all to indicate that the 245 * znode is known and in a valid state to be moved by this function. 246 */ 247 zfsvfs = ozp->z_zfsvfs; 248 if (!POINTER_IS_VALID(zfsvfs)) { 249 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_invalid); 250 return (KMEM_CBRC_DONT_KNOW); 251 } 252 253 /* 254 * Close a small window in which it's possible that the filesystem could 255 * be unmounted and freed, and zfsvfs, though valid in the previous 256 * statement, could point to unrelated memory by the time we try to 257 * prevent the filesystem from being unmounted. 258 */ 259 rw_enter(&zfsvfs_lock, RW_WRITER); 260 if (zfsvfs != ozp->z_zfsvfs) { 261 rw_exit(&zfsvfs_lock); 262 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck1); 263 return (KMEM_CBRC_DONT_KNOW); 264 } 265 266 /* 267 * If the znode is still valid, then so is the file system. We know that 268 * no valid file system can be freed while we hold zfsvfs_lock, so we 269 * can safely ensure that the filesystem is not and will not be 270 * unmounted. The next statement is equivalent to ZFS_ENTER(). 271 */ 272 rrm_enter(&zfsvfs->z_teardown_lock, RW_READER, FTAG); 273 if (zfsvfs->z_unmounted) { 274 ZFS_EXIT(zfsvfs); 275 rw_exit(&zfsvfs_lock); 276 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_unmounted); 277 return (KMEM_CBRC_DONT_KNOW); 278 } 279 rw_exit(&zfsvfs_lock); 280 281 mutex_enter(&zfsvfs->z_znodes_lock); 282 /* 283 * Recheck the vfs pointer in case the znode was removed just before 284 * acquiring the lock. 285 */ 286 if (zfsvfs != ozp->z_zfsvfs) { 287 mutex_exit(&zfsvfs->z_znodes_lock); 288 ZFS_EXIT(zfsvfs); 289 ZNODE_STAT_ADD(znode_move_stats.zms_zfsvfs_recheck2); 290 return (KMEM_CBRC_DONT_KNOW); 291 } 292 293 /* 294 * At this point we know that as long as we hold z_znodes_lock, the 295 * znode cannot be freed and fields within the znode can be safely 296 * accessed. Now, prevent a race with zfs_zget(). 297 */ 298 if (ZFS_OBJ_HOLD_TRYENTER(zfsvfs, ozp->z_id) == 0) { 299 mutex_exit(&zfsvfs->z_znodes_lock); 300 ZFS_EXIT(zfsvfs); 301 ZNODE_STAT_ADD(znode_move_stats.zms_obj_held); 302 return (KMEM_CBRC_LATER); 303 } 304 305 vp = ZTOV(ozp); 306 if (mutex_tryenter(&vp->v_lock) == 0) { 307 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 308 mutex_exit(&zfsvfs->z_znodes_lock); 309 ZFS_EXIT(zfsvfs); 310 ZNODE_STAT_ADD(znode_move_stats.zms_vnode_locked); 311 return (KMEM_CBRC_LATER); 312 } 313 314 /* Only move znodes that are referenced _only_ by the DNLC. */ 315 if (vp->v_count != 1 || !vn_in_dnlc(vp)) { 316 mutex_exit(&vp->v_lock); 317 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 318 mutex_exit(&zfsvfs->z_znodes_lock); 319 ZFS_EXIT(zfsvfs); 320 ZNODE_STAT_ADD(znode_move_stats.zms_not_only_dnlc); 321 return (KMEM_CBRC_LATER); 322 } 323 324 /* 325 * The znode is known and in a valid state to move. We're holding the 326 * locks needed to execute the critical section. 327 */ 328 zfs_znode_move_impl(ozp, nzp); 329 mutex_exit(&vp->v_lock); 330 ZFS_OBJ_HOLD_EXIT(zfsvfs, ozp->z_id); 331 332 list_link_replace(&ozp->z_link_node, &nzp->z_link_node); 333 mutex_exit(&zfsvfs->z_znodes_lock); 334 ZFS_EXIT(zfsvfs); 335 336 return (KMEM_CBRC_YES); 337} 338#endif /* illumos */ 339 340void 341zfs_znode_init(void) 342{ 343 /* 344 * Initialize zcache 345 */ 346 rw_init(&zfsvfs_lock, NULL, RW_DEFAULT, NULL); 347 ASSERT(znode_cache == NULL); 348 znode_cache = kmem_cache_create("zfs_znode_cache", 349 sizeof (znode_t), 0, zfs_znode_cache_constructor, 350 zfs_znode_cache_destructor, NULL, NULL, NULL, 0); 351 kmem_cache_set_move(znode_cache, zfs_znode_move); 352} 353 354void 355zfs_znode_fini(void) 356{ 357#ifdef illumos 358 /* 359 * Cleanup vfs & vnode ops 360 */ 361 zfs_remove_op_tables(); 362#endif 363 364 /* 365 * Cleanup zcache 366 */ 367 if (znode_cache) 368 kmem_cache_destroy(znode_cache); 369 znode_cache = NULL; 370 rw_destroy(&zfsvfs_lock); 371} 372 373#ifdef illumos 374struct vnodeops *zfs_dvnodeops; 375struct vnodeops *zfs_fvnodeops; 376struct vnodeops *zfs_symvnodeops; 377struct vnodeops *zfs_xdvnodeops; 378struct vnodeops *zfs_evnodeops; 379struct vnodeops *zfs_sharevnodeops; 380 381void 382zfs_remove_op_tables() 383{ 384 /* 385 * Remove vfs ops 386 */ 387 ASSERT(zfsfstype); 388 (void) vfs_freevfsops_by_type(zfsfstype); 389 zfsfstype = 0; 390 391 /* 392 * Remove vnode ops 393 */ 394 if (zfs_dvnodeops) 395 vn_freevnodeops(zfs_dvnodeops); 396 if (zfs_fvnodeops) 397 vn_freevnodeops(zfs_fvnodeops); 398 if (zfs_symvnodeops) 399 vn_freevnodeops(zfs_symvnodeops); 400 if (zfs_xdvnodeops) 401 vn_freevnodeops(zfs_xdvnodeops); 402 if (zfs_evnodeops) 403 vn_freevnodeops(zfs_evnodeops); 404 if (zfs_sharevnodeops) 405 vn_freevnodeops(zfs_sharevnodeops); 406 407 zfs_dvnodeops = NULL; 408 zfs_fvnodeops = NULL; 409 zfs_symvnodeops = NULL; 410 zfs_xdvnodeops = NULL; 411 zfs_evnodeops = NULL; 412 zfs_sharevnodeops = NULL; 413} 414 415extern const fs_operation_def_t zfs_dvnodeops_template[]; 416extern const fs_operation_def_t zfs_fvnodeops_template[]; 417extern const fs_operation_def_t zfs_xdvnodeops_template[]; 418extern const fs_operation_def_t zfs_symvnodeops_template[]; 419extern const fs_operation_def_t zfs_evnodeops_template[]; 420extern const fs_operation_def_t zfs_sharevnodeops_template[]; 421 422int 423zfs_create_op_tables() 424{ 425 int error; 426 427 /* 428 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs() 429 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv). 430 * In this case we just return as the ops vectors are already set up. 431 */ 432 if (zfs_dvnodeops) 433 return (0); 434 435 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template, 436 &zfs_dvnodeops); 437 if (error) 438 return (error); 439 440 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template, 441 &zfs_fvnodeops); 442 if (error) 443 return (error); 444 445 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template, 446 &zfs_symvnodeops); 447 if (error) 448 return (error); 449 450 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template, 451 &zfs_xdvnodeops); 452 if (error) 453 return (error); 454 455 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template, 456 &zfs_evnodeops); 457 if (error) 458 return (error); 459 460 error = vn_make_ops(MNTTYPE_ZFS, zfs_sharevnodeops_template, 461 &zfs_sharevnodeops); 462 463 return (error); 464} 465#endif /* illumos */ 466 467int 468zfs_create_share_dir(zfsvfs_t *zfsvfs, dmu_tx_t *tx) 469{ 470 zfs_acl_ids_t acl_ids; 471 vattr_t vattr; 472 znode_t *sharezp; 473 znode_t *zp; 474 int error; 475 476 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 477 vattr.va_type = VDIR; 478 vattr.va_mode = S_IFDIR|0555; 479 vattr.va_uid = crgetuid(kcred); 480 vattr.va_gid = crgetgid(kcred); 481 482 sharezp = kmem_cache_alloc(znode_cache, KM_SLEEP); 483 ASSERT(!POINTER_IS_VALID(sharezp->z_zfsvfs)); 484 sharezp->z_moved = 0; 485 sharezp->z_unlinked = 0; 486 sharezp->z_atime_dirty = 0; 487 sharezp->z_zfsvfs = zfsvfs; 488 sharezp->z_is_sa = zfsvfs->z_use_sa; 489 490 VERIFY(0 == zfs_acl_ids_create(sharezp, IS_ROOT_NODE, &vattr, 491 kcred, NULL, &acl_ids)); 492 zfs_mknode(sharezp, &vattr, tx, kcred, IS_ROOT_NODE, &zp, &acl_ids); 493 ASSERT3P(zp, ==, sharezp); 494 POINTER_INVALIDATE(&sharezp->z_zfsvfs); 495 error = zap_add(zfsvfs->z_os, MASTER_NODE_OBJ, 496 ZFS_SHARES_DIR, 8, 1, &sharezp->z_id, tx); 497 zfsvfs->z_shares_dir = sharezp->z_id; 498 499 zfs_acl_ids_free(&acl_ids); 500 sa_handle_destroy(sharezp->z_sa_hdl); 501 kmem_cache_free(znode_cache, sharezp); 502 503 return (error); 504} 505 506/* 507 * define a couple of values we need available 508 * for both 64 and 32 bit environments. 509 */ 510#ifndef NBITSMINOR64 511#define NBITSMINOR64 32 512#endif 513#ifndef MAXMAJ64 514#define MAXMAJ64 0xffffffffUL 515#endif 516#ifndef MAXMIN64 517#define MAXMIN64 0xffffffffUL 518#endif 519 520/* 521 * Create special expldev for ZFS private use. 522 * Can't use standard expldev since it doesn't do 523 * what we want. The standard expldev() takes a 524 * dev32_t in LP64 and expands it to a long dev_t. 525 * We need an interface that takes a dev32_t in ILP32 526 * and expands it to a long dev_t. 527 */ 528static uint64_t 529zfs_expldev(dev_t dev) 530{ 531 return (((uint64_t)major(dev) << NBITSMINOR64) | minor(dev)); 532} 533/* 534 * Special cmpldev for ZFS private use. 535 * Can't use standard cmpldev since it takes 536 * a long dev_t and compresses it to dev32_t in 537 * LP64. We need to do a compaction of a long dev_t 538 * to a dev32_t in ILP32. 539 */ 540dev_t 541zfs_cmpldev(uint64_t dev) 542{ 543 return (makedev((dev >> NBITSMINOR64), (dev & MAXMIN64))); 544} 545 546static void 547zfs_znode_sa_init(zfsvfs_t *zfsvfs, znode_t *zp, 548 dmu_buf_t *db, dmu_object_type_t obj_type, sa_handle_t *sa_hdl) 549{ 550 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs) || (zfsvfs == zp->z_zfsvfs)); 551 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zfsvfs, zp->z_id))); 552 553 ASSERT(zp->z_sa_hdl == NULL); 554 ASSERT(zp->z_acl_cached == NULL); 555 if (sa_hdl == NULL) { 556 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, zp, 557 SA_HDL_SHARED, &zp->z_sa_hdl)); 558 } else { 559 zp->z_sa_hdl = sa_hdl; 560 sa_set_userp(sa_hdl, zp); 561 } 562 563 zp->z_is_sa = (obj_type == DMU_OT_SA) ? B_TRUE : B_FALSE; 564 565 /* 566 * Slap on VROOT if we are the root znode unless we are the root 567 * node of a snapshot mounted under .zfs. 568 */ 569 if (zp->z_id == zfsvfs->z_root && zfsvfs->z_parent == zfsvfs) 570 ZTOV(zp)->v_flag |= VROOT; 571 572 vn_exists(ZTOV(zp)); 573} 574 575void 576zfs_znode_dmu_fini(znode_t *zp) 577{ 578 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp->z_zfsvfs, zp->z_id)) || 579 zp->z_unlinked || 580 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock)); 581 582 sa_handle_destroy(zp->z_sa_hdl); 583 zp->z_sa_hdl = NULL; 584} 585 586static void 587zfs_vnode_forget(vnode_t *vp) 588{ 589 590 /* copied from insmntque_stddtr */ 591 vp->v_data = NULL; 592 vp->v_op = &dead_vnodeops; 593 vgone(vp); 594 vput(vp); 595} 596 597/* 598 * Construct a new znode/vnode and intialize. 599 * 600 * This does not do a call to dmu_set_user() that is 601 * up to the caller to do, in case you don't want to 602 * return the znode 603 */ 604static znode_t * 605zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz, 606 dmu_object_type_t obj_type, sa_handle_t *hdl) 607{ 608 znode_t *zp; 609 vnode_t *vp; 610 uint64_t mode; 611 uint64_t parent; 612 sa_bulk_attr_t bulk[9]; 613 int count = 0; 614 int error; 615 616 zp = kmem_cache_alloc(znode_cache, KM_SLEEP); 617 618 KASSERT(curthread->td_vp_reserv > 0, 619 ("zfs_znode_alloc: getnewvnode without any vnodes reserved")); 620 error = getnewvnode("zfs", zfsvfs->z_parent->z_vfs, &zfs_vnodeops, &vp); 621 if (error != 0) { 622 kmem_cache_free(znode_cache, zp); 623 return (NULL); 624 } 625 zp->z_vnode = vp; 626 vp->v_data = zp; 627 628 ASSERT(!POINTER_IS_VALID(zp->z_zfsvfs)); 629 zp->z_moved = 0; 630 631 /* 632 * Defer setting z_zfsvfs until the znode is ready to be a candidate for 633 * the zfs_znode_move() callback. 634 */ 635 zp->z_sa_hdl = NULL; 636 zp->z_unlinked = 0; 637 zp->z_atime_dirty = 0; 638 zp->z_mapcnt = 0; 639 zp->z_id = db->db_object; 640 zp->z_blksz = blksz; 641 zp->z_seq = 0x7A4653; 642 zp->z_sync_cnt = 0; 643 644 vp = ZTOV(zp); 645 646 zfs_znode_sa_init(zfsvfs, zp, db, obj_type, hdl); 647 648 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, &mode, 8); 649 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, &zp->z_gen, 8); 650 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 651 &zp->z_size, 8); 652 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 653 &zp->z_links, 8); 654 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 655 &zp->z_pflags, 8); 656 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_PARENT(zfsvfs), NULL, &parent, 8); 657 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 658 &zp->z_atime, 16); 659 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 660 &zp->z_uid, 8); 661 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 662 &zp->z_gid, 8); 663 664 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count) != 0 || zp->z_gen == 0) { 665 if (hdl == NULL) 666 sa_handle_destroy(zp->z_sa_hdl); 667 zfs_vnode_forget(vp); 668 zp->z_vnode = NULL; 669 kmem_cache_free(znode_cache, zp); 670 return (NULL); 671 } 672 673 zp->z_mode = mode; 674 675 vp->v_type = IFTOVT((mode_t)mode); 676 677 switch (vp->v_type) { 678 case VDIR: 679 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ 680 break; 681#ifdef illumos 682 case VBLK: 683 case VCHR: 684 { 685 uint64_t rdev; 686 VERIFY(sa_lookup(zp->z_sa_hdl, SA_ZPL_RDEV(zfsvfs), 687 &rdev, sizeof (rdev)) == 0); 688 689 vp->v_rdev = zfs_cmpldev(rdev); 690 } 691 break; 692#endif 693 case VFIFO: 694#ifdef illumos 695 case VSOCK: 696 case VDOOR: 697#endif 698 vp->v_op = &zfs_fifoops; 699 break; 700 case VREG: 701 if (parent == zfsvfs->z_shares_dir) { 702 ASSERT(zp->z_uid == 0 && zp->z_gid == 0); 703 vp->v_op = &zfs_shareops; 704 } 705 break; 706#ifdef illumos 707 case VLNK: 708 vn_setops(vp, zfs_symvnodeops); 709 break; 710 default: 711 vn_setops(vp, zfs_evnodeops); 712 break; 713#endif 714 } 715 716 mutex_enter(&zfsvfs->z_znodes_lock); 717 list_insert_tail(&zfsvfs->z_all_znodes, zp); 718 membar_producer(); 719 /* 720 * Everything else must be valid before assigning z_zfsvfs makes the 721 * znode eligible for zfs_znode_move(). 722 */ 723 zp->z_zfsvfs = zfsvfs; 724 mutex_exit(&zfsvfs->z_znodes_lock); 725 726 /* 727 * Acquire vnode lock before making it available to the world. 728 */ 729 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 730 VN_LOCK_AREC(vp); 731 if (vp->v_type != VFIFO) 732 VN_LOCK_ASHARE(vp); 733 734#ifdef illumos 735 VFS_HOLD(zfsvfs->z_vfs); 736#endif 737 return (zp); 738} 739 740static uint64_t empty_xattr; 741static uint64_t pad[4]; 742static zfs_acl_phys_t acl_phys; 743/* 744 * Create a new DMU object to hold a zfs znode. 745 * 746 * IN: dzp - parent directory for new znode 747 * vap - file attributes for new znode 748 * tx - dmu transaction id for zap operations 749 * cr - credentials of caller 750 * flag - flags: 751 * IS_ROOT_NODE - new object will be root 752 * IS_XATTR - new object is an attribute 753 * bonuslen - length of bonus buffer 754 * setaclp - File/Dir initial ACL 755 * fuidp - Tracks fuid allocation. 756 * 757 * OUT: zpp - allocated znode 758 * 759 */ 760void 761zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 762 uint_t flag, znode_t **zpp, zfs_acl_ids_t *acl_ids) 763{ 764 uint64_t crtime[2], atime[2], mtime[2], ctime[2]; 765 uint64_t mode, size, links, parent, pflags; 766 uint64_t dzp_pflags = 0; 767 uint64_t rdev = 0; 768 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 769 dmu_buf_t *db; 770 timestruc_t now; 771 uint64_t gen, obj; 772 int err; 773 int bonuslen; 774 sa_handle_t *sa_hdl; 775 dmu_object_type_t obj_type; 776 sa_bulk_attr_t sa_attrs[ZPL_END]; 777 int cnt = 0; 778 zfs_acl_locator_cb_t locate = { 0 }; 779 780 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); 781 782 if (zfsvfs->z_replay) { 783 obj = vap->va_nodeid; 784 now = vap->va_ctime; /* see zfs_replay_create() */ 785 gen = vap->va_nblocks; /* ditto */ 786 } else { 787 obj = 0; 788 vfs_timestamp(&now); 789 gen = dmu_tx_get_txg(tx); 790 } 791 792 obj_type = zfsvfs->z_use_sa ? DMU_OT_SA : DMU_OT_ZNODE; 793 bonuslen = (obj_type == DMU_OT_SA) ? 794 DN_MAX_BONUSLEN : ZFS_OLD_ZNODE_PHYS_SIZE; 795 796 /* 797 * Create a new DMU object. 798 */ 799 /* 800 * There's currently no mechanism for pre-reading the blocks that will 801 * be needed to allocate a new object, so we accept the small chance 802 * that there will be an i/o error and we will fail one of the 803 * assertions below. 804 */ 805 if (vap->va_type == VDIR) { 806 if (zfsvfs->z_replay) { 807 VERIFY0(zap_create_claim_norm(zfsvfs->z_os, obj, 808 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 809 obj_type, bonuslen, tx)); 810 } else { 811 obj = zap_create_norm(zfsvfs->z_os, 812 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 813 obj_type, bonuslen, tx); 814 } 815 } else { 816 if (zfsvfs->z_replay) { 817 VERIFY0(dmu_object_claim(zfsvfs->z_os, obj, 818 DMU_OT_PLAIN_FILE_CONTENTS, 0, 819 obj_type, bonuslen, tx)); 820 } else { 821 obj = dmu_object_alloc(zfsvfs->z_os, 822 DMU_OT_PLAIN_FILE_CONTENTS, 0, 823 obj_type, bonuslen, tx); 824 } 825 } 826 827 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 828 VERIFY(0 == sa_buf_hold(zfsvfs->z_os, obj, NULL, &db)); 829 830 /* 831 * If this is the root, fix up the half-initialized parent pointer 832 * to reference the just-allocated physical data area. 833 */ 834 if (flag & IS_ROOT_NODE) { 835 dzp->z_id = obj; 836 } else { 837 dzp_pflags = dzp->z_pflags; 838 } 839 840 /* 841 * If parent is an xattr, so am I. 842 */ 843 if (dzp_pflags & ZFS_XATTR) { 844 flag |= IS_XATTR; 845 } 846 847 if (zfsvfs->z_use_fuids) 848 pflags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; 849 else 850 pflags = 0; 851 852 if (vap->va_type == VDIR) { 853 size = 2; /* contents ("." and "..") */ 854 links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1; 855 } else { 856 size = links = 0; 857 } 858 859 if (vap->va_type == VBLK || vap->va_type == VCHR) { 860 rdev = zfs_expldev(vap->va_rdev); 861 } 862 863 parent = dzp->z_id; 864 mode = acl_ids->z_mode; 865 if (flag & IS_XATTR) 866 pflags |= ZFS_XATTR; 867 868 /* 869 * No execs denied will be deterimed when zfs_mode_compute() is called. 870 */ 871 pflags |= acl_ids->z_aclp->z_hints & 872 (ZFS_ACL_TRIVIAL|ZFS_INHERIT_ACE|ZFS_ACL_AUTO_INHERIT| 873 ZFS_ACL_DEFAULTED|ZFS_ACL_PROTECTED); 874 875 ZFS_TIME_ENCODE(&now, crtime); 876 ZFS_TIME_ENCODE(&now, ctime); 877 878 if (vap->va_mask & AT_ATIME) { 879 ZFS_TIME_ENCODE(&vap->va_atime, atime); 880 } else { 881 ZFS_TIME_ENCODE(&now, atime); 882 } 883 884 if (vap->va_mask & AT_MTIME) { 885 ZFS_TIME_ENCODE(&vap->va_mtime, mtime); 886 } else { 887 ZFS_TIME_ENCODE(&now, mtime); 888 } 889 890 /* Now add in all of the "SA" attributes */ 891 VERIFY(0 == sa_handle_get_from_db(zfsvfs->z_os, db, NULL, SA_HDL_SHARED, 892 &sa_hdl)); 893 894 /* 895 * Setup the array of attributes to be replaced/set on the new file 896 * 897 * order for DMU_OT_ZNODE is critical since it needs to be constructed 898 * in the old znode_phys_t format. Don't change this ordering 899 */ 900 901 if (obj_type == DMU_OT_ZNODE) { 902 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 903 NULL, &atime, 16); 904 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 905 NULL, &mtime, 16); 906 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 907 NULL, &ctime, 16); 908 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 909 NULL, &crtime, 16); 910 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GEN(zfsvfs), 911 NULL, &gen, 8); 912 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 913 NULL, &mode, 8); 914 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 915 NULL, &size, 8); 916 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 917 NULL, &parent, 8); 918 } else { 919 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MODE(zfsvfs), 920 NULL, &mode, 8); 921 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_SIZE(zfsvfs), 922 NULL, &size, 8); 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_UID(zfsvfs), NULL, 926 &acl_ids->z_fuid, 8); 927 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 928 &acl_ids->z_fgid, 8); 929 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PARENT(zfsvfs), 930 NULL, &parent, 8); 931 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 932 NULL, &pflags, 8); 933 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ATIME(zfsvfs), 934 NULL, &atime, 16); 935 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_MTIME(zfsvfs), 936 NULL, &mtime, 16); 937 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CTIME(zfsvfs), 938 NULL, &ctime, 16); 939 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_CRTIME(zfsvfs), 940 NULL, &crtime, 16); 941 } 942 943 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_LINKS(zfsvfs), NULL, &links, 8); 944 945 if (obj_type == DMU_OT_ZNODE) { 946 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_XATTR(zfsvfs), NULL, 947 &empty_xattr, 8); 948 } 949 if (obj_type == DMU_OT_ZNODE || 950 (vap->va_type == VBLK || vap->va_type == VCHR)) { 951 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_RDEV(zfsvfs), 952 NULL, &rdev, 8); 953 954 } 955 if (obj_type == DMU_OT_ZNODE) { 956 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_FLAGS(zfsvfs), 957 NULL, &pflags, 8); 958 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_UID(zfsvfs), NULL, 959 &acl_ids->z_fuid, 8); 960 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_GID(zfsvfs), NULL, 961 &acl_ids->z_fgid, 8); 962 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_PAD(zfsvfs), NULL, pad, 963 sizeof (uint64_t) * 4); 964 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_ZNODE_ACL(zfsvfs), NULL, 965 &acl_phys, sizeof (zfs_acl_phys_t)); 966 } else if (acl_ids->z_aclp->z_version >= ZFS_ACL_VERSION_FUID) { 967 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_COUNT(zfsvfs), NULL, 968 &acl_ids->z_aclp->z_acl_count, 8); 969 locate.cb_aclp = acl_ids->z_aclp; 970 SA_ADD_BULK_ATTR(sa_attrs, cnt, SA_ZPL_DACL_ACES(zfsvfs), 971 zfs_acl_data_locator, &locate, 972 acl_ids->z_aclp->z_acl_bytes); 973 mode = zfs_mode_compute(mode, acl_ids->z_aclp, &pflags, 974 acl_ids->z_fuid, acl_ids->z_fgid); 975 } 976 977 VERIFY(sa_replace_all_by_template(sa_hdl, sa_attrs, cnt, tx) == 0); 978 979 if (!(flag & IS_ROOT_NODE)) { 980 *zpp = zfs_znode_alloc(zfsvfs, db, 0, obj_type, sa_hdl); 981 ASSERT(*zpp != NULL); 982 } else { 983 /* 984 * If we are creating the root node, the "parent" we 985 * passed in is the znode for the root. 986 */ 987 *zpp = dzp; 988 989 (*zpp)->z_sa_hdl = sa_hdl; 990 } 991 992 (*zpp)->z_pflags = pflags; 993 (*zpp)->z_mode = mode; 994 995 if (vap->va_mask & AT_XVATTR) 996 zfs_xvattr_set(*zpp, (xvattr_t *)vap, tx); 997 998 if (obj_type == DMU_OT_ZNODE || 999 acl_ids->z_aclp->z_version < ZFS_ACL_VERSION_FUID) { 1000 VERIFY0(zfs_aclset_common(*zpp, acl_ids->z_aclp, cr, tx)); 1001 } 1002 if (!(flag & IS_ROOT_NODE)) { 1003 vnode_t *vp; 1004 1005 vp = ZTOV(*zpp); 1006 vp->v_vflag |= VV_FORCEINSMQ; 1007 err = insmntque(vp, zfsvfs->z_vfs); 1008 vp->v_vflag &= ~VV_FORCEINSMQ; 1009 KASSERT(err == 0, ("insmntque() failed: error %d", err)); 1010 } 1011 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1012} 1013 1014/* 1015 * Update in-core attributes. It is assumed the caller will be doing an 1016 * sa_bulk_update to push the changes out. 1017 */ 1018void 1019zfs_xvattr_set(znode_t *zp, xvattr_t *xvap, dmu_tx_t *tx) 1020{ 1021 xoptattr_t *xoap; 1022 1023 xoap = xva_getxoptattr(xvap); 1024 ASSERT(xoap); 1025 1026 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 1027 uint64_t times[2]; 1028 ZFS_TIME_ENCODE(&xoap->xoa_createtime, times); 1029 (void) sa_update(zp->z_sa_hdl, SA_ZPL_CRTIME(zp->z_zfsvfs), 1030 ×, sizeof (times), tx); 1031 XVA_SET_RTN(xvap, XAT_CREATETIME); 1032 } 1033 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 1034 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly, 1035 zp->z_pflags, tx); 1036 XVA_SET_RTN(xvap, XAT_READONLY); 1037 } 1038 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 1039 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden, 1040 zp->z_pflags, tx); 1041 XVA_SET_RTN(xvap, XAT_HIDDEN); 1042 } 1043 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 1044 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system, 1045 zp->z_pflags, tx); 1046 XVA_SET_RTN(xvap, XAT_SYSTEM); 1047 } 1048 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 1049 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive, 1050 zp->z_pflags, tx); 1051 XVA_SET_RTN(xvap, XAT_ARCHIVE); 1052 } 1053 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 1054 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable, 1055 zp->z_pflags, tx); 1056 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 1057 } 1058 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 1059 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink, 1060 zp->z_pflags, tx); 1061 XVA_SET_RTN(xvap, XAT_NOUNLINK); 1062 } 1063 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 1064 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly, 1065 zp->z_pflags, tx); 1066 XVA_SET_RTN(xvap, XAT_APPENDONLY); 1067 } 1068 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 1069 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump, 1070 zp->z_pflags, tx); 1071 XVA_SET_RTN(xvap, XAT_NODUMP); 1072 } 1073 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 1074 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque, 1075 zp->z_pflags, tx); 1076 XVA_SET_RTN(xvap, XAT_OPAQUE); 1077 } 1078 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 1079 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED, 1080 xoap->xoa_av_quarantined, zp->z_pflags, tx); 1081 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 1082 } 1083 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 1084 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified, 1085 zp->z_pflags, tx); 1086 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 1087 } 1088 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { 1089 zfs_sa_set_scanstamp(zp, xvap, tx); 1090 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); 1091 } 1092 if (XVA_ISSET_REQ(xvap, XAT_REPARSE)) { 1093 ZFS_ATTR_SET(zp, ZFS_REPARSE, xoap->xoa_reparse, 1094 zp->z_pflags, tx); 1095 XVA_SET_RTN(xvap, XAT_REPARSE); 1096 } 1097 if (XVA_ISSET_REQ(xvap, XAT_OFFLINE)) { 1098 ZFS_ATTR_SET(zp, ZFS_OFFLINE, xoap->xoa_offline, 1099 zp->z_pflags, tx); 1100 XVA_SET_RTN(xvap, XAT_OFFLINE); 1101 } 1102 if (XVA_ISSET_REQ(xvap, XAT_SPARSE)) { 1103 ZFS_ATTR_SET(zp, ZFS_SPARSE, xoap->xoa_sparse, 1104 zp->z_pflags, tx); 1105 XVA_SET_RTN(xvap, XAT_SPARSE); 1106 } 1107} 1108 1109int 1110zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 1111{ 1112 dmu_object_info_t doi; 1113 dmu_buf_t *db; 1114 znode_t *zp; 1115 vnode_t *vp; 1116 sa_handle_t *hdl; 1117 struct thread *td; 1118 int locked; 1119 int err; 1120 1121 td = curthread; 1122 getnewvnode_reserve(1); 1123again: 1124 *zpp = NULL; 1125 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1126 1127 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1128 if (err) { 1129 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1130 getnewvnode_drop_reserve(); 1131 return (err); 1132 } 1133 1134 dmu_object_info_from_db(db, &doi); 1135 if (doi.doi_bonus_type != DMU_OT_SA && 1136 (doi.doi_bonus_type != DMU_OT_ZNODE || 1137 (doi.doi_bonus_type == DMU_OT_ZNODE && 1138 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1139 sa_buf_rele(db, NULL); 1140 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1141#ifdef __FreeBSD__ 1142 getnewvnode_drop_reserve(); 1143#endif 1144 return (SET_ERROR(EINVAL)); 1145 } 1146 1147 hdl = dmu_buf_get_user(db); 1148 if (hdl != NULL) { 1149 zp = sa_get_userdata(hdl); 1150 1151 /* 1152 * Since "SA" does immediate eviction we 1153 * should never find a sa handle that doesn't 1154 * know about the znode. 1155 */ 1156 ASSERT3P(zp, !=, NULL); 1157 ASSERT3U(zp->z_id, ==, obj_num); 1158 *zpp = zp; 1159 vp = ZTOV(zp); 1160 1161 /* Don't let the vnode disappear after ZFS_OBJ_HOLD_EXIT. */ 1162 VN_HOLD(vp); 1163 1164 sa_buf_rele(db, NULL); 1165 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1166 1167 locked = VOP_ISLOCKED(vp); 1168 VI_LOCK(vp); 1169 if ((vp->v_iflag & VI_DOOMED) != 0 && 1170 locked != LK_EXCLUSIVE) { 1171 /* 1172 * The vnode is doomed and this thread doesn't 1173 * hold the exclusive lock on it, so the vnode 1174 * must be being reclaimed by another thread. 1175 * Otherwise the doomed vnode is being reclaimed 1176 * by this thread and zfs_zget is called from 1177 * ZIL internals. 1178 */ 1179 VI_UNLOCK(vp); 1180 1181 /* 1182 * XXX vrele() locks the vnode when the last reference 1183 * is dropped. Although in this case the vnode is 1184 * doomed / dead and so no inactivation is required, 1185 * the vnode lock is still acquired. That could result 1186 * in a LOR with z_teardown_lock if another thread holds 1187 * the vnode's lock and tries to take z_teardown_lock. 1188 * But that is only possible if the other thread peforms 1189 * a ZFS vnode operation on the vnode. That either 1190 * should not happen if the vnode is dead or the thread 1191 * should also have a refrence to the vnode and thus 1192 * our reference is not last. 1193 */ 1194 VN_RELE(vp); 1195 goto again; 1196 } 1197 VI_UNLOCK(vp); 1198 getnewvnode_drop_reserve(); 1199 return (0); 1200 } 1201 1202 /* 1203 * Not found create new znode/vnode 1204 * but only if file exists. 1205 * 1206 * There is a small window where zfs_vget() could 1207 * find this object while a file create is still in 1208 * progress. This is checked for in zfs_znode_alloc() 1209 * 1210 * if zfs_znode_alloc() fails it will drop the hold on the 1211 * bonus buffer. 1212 */ 1213 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size, 1214 doi.doi_bonus_type, NULL); 1215 if (zp == NULL) { 1216 err = SET_ERROR(ENOENT); 1217 } else { 1218 *zpp = zp; 1219 } 1220 if (err == 0) { 1221 vnode_t *vp = ZTOV(zp); 1222 1223 err = insmntque(vp, zfsvfs->z_vfs); 1224 if (err == 0) { 1225 vp->v_hash = obj_num; 1226 VOP_UNLOCK(vp, 0); 1227 } else { 1228 zp->z_vnode = NULL; 1229 zfs_znode_dmu_fini(zp); 1230 zfs_znode_free(zp); 1231 *zpp = NULL; 1232 } 1233 } 1234 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1235 getnewvnode_drop_reserve(); 1236 return (err); 1237} 1238 1239int 1240zfs_rezget(znode_t *zp) 1241{ 1242 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1243 dmu_object_info_t doi; 1244 dmu_buf_t *db; 1245 vnode_t *vp; 1246 uint64_t obj_num = zp->z_id; 1247 uint64_t mode, size; 1248 sa_bulk_attr_t bulk[8]; 1249 int err; 1250 int count = 0; 1251 uint64_t gen; 1252 1253 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 1254 1255 mutex_enter(&zp->z_acl_lock); 1256 if (zp->z_acl_cached) { 1257 zfs_acl_free(zp->z_acl_cached); 1258 zp->z_acl_cached = NULL; 1259 } 1260 1261 mutex_exit(&zp->z_acl_lock); 1262 ASSERT(zp->z_sa_hdl == NULL); 1263 err = sa_buf_hold(zfsvfs->z_os, obj_num, NULL, &db); 1264 if (err) { 1265 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1266 return (err); 1267 } 1268 1269 dmu_object_info_from_db(db, &doi); 1270 if (doi.doi_bonus_type != DMU_OT_SA && 1271 (doi.doi_bonus_type != DMU_OT_ZNODE || 1272 (doi.doi_bonus_type == DMU_OT_ZNODE && 1273 doi.doi_bonus_size < sizeof (znode_phys_t)))) { 1274 sa_buf_rele(db, NULL); 1275 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1276 return (SET_ERROR(EINVAL)); 1277 } 1278 1279 zfs_znode_sa_init(zfsvfs, zp, db, doi.doi_bonus_type, NULL); 1280 size = zp->z_size; 1281 1282 /* reload cached values */ 1283 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GEN(zfsvfs), NULL, 1284 &gen, sizeof (gen)); 1285 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), NULL, 1286 &zp->z_size, sizeof (zp->z_size)); 1287 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_LINKS(zfsvfs), NULL, 1288 &zp->z_links, sizeof (zp->z_links)); 1289 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), NULL, 1290 &zp->z_pflags, sizeof (zp->z_pflags)); 1291 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_ATIME(zfsvfs), NULL, 1292 &zp->z_atime, sizeof (zp->z_atime)); 1293 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_UID(zfsvfs), NULL, 1294 &zp->z_uid, sizeof (zp->z_uid)); 1295 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_GID(zfsvfs), NULL, 1296 &zp->z_gid, sizeof (zp->z_gid)); 1297 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MODE(zfsvfs), NULL, 1298 &mode, sizeof (mode)); 1299 1300 if (sa_bulk_lookup(zp->z_sa_hdl, bulk, count)) { 1301 zfs_znode_dmu_fini(zp); 1302 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1303 return (SET_ERROR(EIO)); 1304 } 1305 1306 zp->z_mode = mode; 1307 1308 if (gen != zp->z_gen) { 1309 zfs_znode_dmu_fini(zp); 1310 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1311 return (SET_ERROR(EIO)); 1312 } 1313 1314 /* 1315 * It is highly improbable but still quite possible that two 1316 * objects in different datasets are created with the same 1317 * object numbers and in transaction groups with the same 1318 * numbers. znodes corresponding to those objects would 1319 * have the same z_id and z_gen, but their other attributes 1320 * may be different. 1321 * zfs recv -F may replace one of such objects with the other. 1322 * As a result file properties recorded in the replaced 1323 * object's vnode may no longer match the received object's 1324 * properties. At present the only cached property is the 1325 * files type recorded in v_type. 1326 * So, handle this case by leaving the old vnode and znode 1327 * disassociated from the actual object. A new vnode and a 1328 * znode will be created if the object is accessed 1329 * (e.g. via a look-up). The old vnode and znode will be 1330 * recycled when the last vnode reference is dropped. 1331 */ 1332 vp = ZTOV(zp); 1333 if (vp->v_type != IFTOVT((mode_t)zp->z_mode)) { 1334 zfs_znode_dmu_fini(zp); 1335 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1336 return (EIO); 1337 } 1338 1339 zp->z_unlinked = (zp->z_links == 0); 1340 zp->z_blksz = doi.doi_data_block_size; 1341 vn_pages_remove(vp, 0, 0); 1342 if (zp->z_size != size) 1343 vnode_pager_setsize(vp, zp->z_size); 1344 1345 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 1346 1347 return (0); 1348} 1349 1350void 1351zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) 1352{ 1353 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1354 objset_t *os = zfsvfs->z_os; 1355 uint64_t obj = zp->z_id; 1356 uint64_t acl_obj = zfs_external_acl(zp); 1357 1358 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 1359 if (acl_obj) { 1360 VERIFY(!zp->z_is_sa); 1361 VERIFY(0 == dmu_object_free(os, acl_obj, tx)); 1362 } 1363 VERIFY(0 == dmu_object_free(os, obj, tx)); 1364 zfs_znode_dmu_fini(zp); 1365 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 1366 zfs_znode_free(zp); 1367} 1368 1369void 1370zfs_zinactive(znode_t *zp) 1371{ 1372 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1373 uint64_t z_id = zp->z_id; 1374 1375 ASSERT(zp->z_sa_hdl); 1376 1377 /* 1378 * Don't allow a zfs_zget() while were trying to release this znode 1379 */ 1380 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); 1381 1382 /* 1383 * If this was the last reference to a file with no links, 1384 * remove the file from the file system. 1385 */ 1386 if (zp->z_unlinked) { 1387 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1388 zfs_rmnode(zp); 1389 return; 1390 } 1391 1392 zfs_znode_dmu_fini(zp); 1393 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 1394 zfs_znode_free(zp); 1395} 1396 1397void 1398zfs_znode_free(znode_t *zp) 1399{ 1400 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1401 1402 ASSERT(zp->z_sa_hdl == NULL); 1403 zp->z_vnode = NULL; 1404 mutex_enter(&zfsvfs->z_znodes_lock); 1405 POINTER_INVALIDATE(&zp->z_zfsvfs); 1406 list_remove(&zfsvfs->z_all_znodes, zp); 1407 mutex_exit(&zfsvfs->z_znodes_lock); 1408 1409 if (zp->z_acl_cached) { 1410 zfs_acl_free(zp->z_acl_cached); 1411 zp->z_acl_cached = NULL; 1412 } 1413 1414 kmem_cache_free(znode_cache, zp); 1415 1416#ifdef illumos 1417 VFS_RELE(zfsvfs->z_vfs); 1418#endif 1419} 1420 1421void 1422zfs_tstamp_update_setup(znode_t *zp, uint_t flag, uint64_t mtime[2], 1423 uint64_t ctime[2], boolean_t have_tx) 1424{ 1425 timestruc_t now; 1426 1427 vfs_timestamp(&now); 1428 1429 if (have_tx) { /* will sa_bulk_update happen really soon? */ 1430 zp->z_atime_dirty = 0; 1431 zp->z_seq++; 1432 } else { 1433 zp->z_atime_dirty = 1; 1434 } 1435 1436 if (flag & AT_ATIME) { 1437 ZFS_TIME_ENCODE(&now, zp->z_atime); 1438 } 1439 1440 if (flag & AT_MTIME) { 1441 ZFS_TIME_ENCODE(&now, mtime); 1442 if (zp->z_zfsvfs->z_use_fuids) { 1443 zp->z_pflags |= (ZFS_ARCHIVE | 1444 ZFS_AV_MODIFIED); 1445 } 1446 } 1447 1448 if (flag & AT_CTIME) { 1449 ZFS_TIME_ENCODE(&now, ctime); 1450 if (zp->z_zfsvfs->z_use_fuids) 1451 zp->z_pflags |= ZFS_ARCHIVE; 1452 } 1453} 1454 1455/* 1456 * Grow the block size for a file. 1457 * 1458 * IN: zp - znode of file to free data in. 1459 * size - requested block size 1460 * tx - open transaction. 1461 * 1462 * NOTE: this function assumes that the znode is write locked. 1463 */ 1464void 1465zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx) 1466{ 1467 int error; 1468 u_longlong_t dummy; 1469 1470 if (size <= zp->z_blksz) 1471 return; 1472 /* 1473 * If the file size is already greater than the current blocksize, 1474 * we will not grow. If there is more than one block in a file, 1475 * the blocksize cannot change. 1476 */ 1477 if (zp->z_blksz && zp->z_size > zp->z_blksz) 1478 return; 1479 1480 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id, 1481 size, 0, tx); 1482 1483 if (error == ENOTSUP) 1484 return; 1485 ASSERT0(error); 1486 1487 /* What blocksize did we actually get? */ 1488 dmu_object_size_from_db(sa_get_db(zp->z_sa_hdl), &zp->z_blksz, &dummy); 1489} 1490 1491#ifdef illumos 1492/* 1493 * This is a dummy interface used when pvn_vplist_dirty() should *not* 1494 * be calling back into the fs for a putpage(). E.g.: when truncating 1495 * a file, the pages being "thrown away* don't need to be written out. 1496 */ 1497/* ARGSUSED */ 1498static int 1499zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, 1500 int flags, cred_t *cr) 1501{ 1502 ASSERT(0); 1503 return (0); 1504} 1505#endif 1506 1507/* 1508 * Increase the file length 1509 * 1510 * IN: zp - znode of file to free data in. 1511 * end - new end-of-file 1512 * 1513 * RETURN: 0 on success, error code on failure 1514 */ 1515static int 1516zfs_extend(znode_t *zp, uint64_t end) 1517{ 1518 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1519 dmu_tx_t *tx; 1520 rl_t *rl; 1521 uint64_t newblksz; 1522 int error; 1523 1524 /* 1525 * We will change zp_size, lock the whole file. 1526 */ 1527 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1528 1529 /* 1530 * Nothing to do if file already at desired length. 1531 */ 1532 if (end <= zp->z_size) { 1533 zfs_range_unlock(rl); 1534 return (0); 1535 } 1536 tx = dmu_tx_create(zfsvfs->z_os); 1537 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1538 zfs_sa_upgrade_txholds(tx, zp); 1539 if (end > zp->z_blksz && 1540 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) { 1541 /* 1542 * We are growing the file past the current block size. 1543 */ 1544 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) { 1545 /* 1546 * File's blocksize is already larger than the 1547 * "recordsize" property. Only let it grow to 1548 * the next power of 2. 1549 */ 1550 ASSERT(!ISP2(zp->z_blksz)); 1551 newblksz = MIN(end, 1 << highbit64(zp->z_blksz)); 1552 } else { 1553 newblksz = MIN(end, zp->z_zfsvfs->z_max_blksz); 1554 } 1555 dmu_tx_hold_write(tx, zp->z_id, 0, newblksz); 1556 } else { 1557 newblksz = 0; 1558 } 1559 1560 error = dmu_tx_assign(tx, TXG_WAIT); 1561 if (error) { 1562 dmu_tx_abort(tx); 1563 zfs_range_unlock(rl); 1564 return (error); 1565 } 1566 1567 if (newblksz) 1568 zfs_grow_blocksize(zp, newblksz, tx); 1569 1570 zp->z_size = end; 1571 1572 VERIFY(0 == sa_update(zp->z_sa_hdl, SA_ZPL_SIZE(zp->z_zfsvfs), 1573 &zp->z_size, sizeof (zp->z_size), tx)); 1574 1575 vnode_pager_setsize(ZTOV(zp), end); 1576 1577 zfs_range_unlock(rl); 1578 1579 dmu_tx_commit(tx); 1580 1581 return (0); 1582} 1583 1584/* 1585 * Free space in a file. 1586 * 1587 * IN: zp - znode of file to free data in. 1588 * off - start of section to free. 1589 * len - length of section to free. 1590 * 1591 * RETURN: 0 on success, error code on failure 1592 */ 1593static int 1594zfs_free_range(znode_t *zp, uint64_t off, uint64_t len) 1595{ 1596 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1597 rl_t *rl; 1598 int error; 1599 1600 /* 1601 * Lock the range being freed. 1602 */ 1603 rl = zfs_range_lock(zp, off, len, RL_WRITER); 1604 1605 /* 1606 * Nothing to do if file already at desired length. 1607 */ 1608 if (off >= zp->z_size) { 1609 zfs_range_unlock(rl); 1610 return (0); 1611 } 1612 1613 if (off + len > zp->z_size) 1614 len = zp->z_size - off; 1615 1616 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, off, len); 1617 1618 if (error == 0) { 1619 /* 1620 * In FreeBSD we cannot free block in the middle of a file, 1621 * but only at the end of a file, so this code path should 1622 * never happen. 1623 */ 1624 vnode_pager_setsize(ZTOV(zp), off); 1625 } 1626 1627 zfs_range_unlock(rl); 1628 1629 return (error); 1630} 1631 1632/* 1633 * Truncate a file 1634 * 1635 * IN: zp - znode of file to free data in. 1636 * end - new end-of-file. 1637 * 1638 * RETURN: 0 on success, error code on failure 1639 */ 1640static int 1641zfs_trunc(znode_t *zp, uint64_t end) 1642{ 1643 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1644 vnode_t *vp = ZTOV(zp); 1645 dmu_tx_t *tx; 1646 rl_t *rl; 1647 int error; 1648 sa_bulk_attr_t bulk[2]; 1649 int count = 0; 1650 1651 /* 1652 * We will change zp_size, lock the whole file. 1653 */ 1654 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1655 1656 /* 1657 * Nothing to do if file already at desired length. 1658 */ 1659 if (end >= zp->z_size) { 1660 zfs_range_unlock(rl); 1661 return (0); 1662 } 1663 1664 error = dmu_free_long_range(zfsvfs->z_os, zp->z_id, end, -1); 1665 if (error) { 1666 zfs_range_unlock(rl); 1667 return (error); 1668 } 1669 tx = dmu_tx_create(zfsvfs->z_os); 1670 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1671 zfs_sa_upgrade_txholds(tx, zp); 1672 dmu_tx_mark_netfree(tx); 1673 error = dmu_tx_assign(tx, TXG_WAIT); 1674 if (error) { 1675 dmu_tx_abort(tx); 1676 zfs_range_unlock(rl); 1677 return (error); 1678 } 1679 1680 zp->z_size = end; 1681 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_SIZE(zfsvfs), 1682 NULL, &zp->z_size, sizeof (zp->z_size)); 1683 1684 if (end == 0) { 1685 zp->z_pflags &= ~ZFS_SPARSE; 1686 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1687 NULL, &zp->z_pflags, 8); 1688 } 1689 VERIFY(sa_bulk_update(zp->z_sa_hdl, bulk, count, tx) == 0); 1690 1691 dmu_tx_commit(tx); 1692 1693 /* 1694 * Clear any mapped pages in the truncated region. This has to 1695 * happen outside of the transaction to avoid the possibility of 1696 * a deadlock with someone trying to push a page that we are 1697 * about to invalidate. 1698 */ 1699 vnode_pager_setsize(vp, end); 1700 1701 zfs_range_unlock(rl); 1702 1703 return (0); 1704} 1705 1706/* 1707 * Free space in a file 1708 * 1709 * IN: zp - znode of file to free data in. 1710 * off - start of range 1711 * len - end of range (0 => EOF) 1712 * flag - current file open mode flags. 1713 * log - TRUE if this action should be logged 1714 * 1715 * RETURN: 0 on success, error code on failure 1716 */ 1717int 1718zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) 1719{ 1720 vnode_t *vp = ZTOV(zp); 1721 dmu_tx_t *tx; 1722 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1723 zilog_t *zilog = zfsvfs->z_log; 1724 uint64_t mode; 1725 uint64_t mtime[2], ctime[2]; 1726 sa_bulk_attr_t bulk[3]; 1727 int count = 0; 1728 int error; 1729 1730 if ((error = sa_lookup(zp->z_sa_hdl, SA_ZPL_MODE(zfsvfs), &mode, 1731 sizeof (mode))) != 0) 1732 return (error); 1733 1734 if (off > zp->z_size) { 1735 error = zfs_extend(zp, off+len); 1736 if (error == 0 && log) 1737 goto log; 1738 else 1739 return (error); 1740 } 1741 1742 /* 1743 * Check for any locks in the region to be freed. 1744 */ 1745 1746 if (MANDLOCK(vp, (mode_t)mode)) { 1747 uint64_t length = (len ? len : zp->z_size - off); 1748 if (error = chklock(vp, FWRITE, off, length, flag, NULL)) 1749 return (error); 1750 } 1751 1752 if (len == 0) { 1753 error = zfs_trunc(zp, off); 1754 } else { 1755 if ((error = zfs_free_range(zp, off, len)) == 0 && 1756 off + len > zp->z_size) 1757 error = zfs_extend(zp, off+len); 1758 } 1759 if (error || !log) 1760 return (error); 1761log: 1762 tx = dmu_tx_create(zfsvfs->z_os); 1763 dmu_tx_hold_sa(tx, zp->z_sa_hdl, B_FALSE); 1764 zfs_sa_upgrade_txholds(tx, zp); 1765 error = dmu_tx_assign(tx, TXG_WAIT); 1766 if (error) { 1767 dmu_tx_abort(tx); 1768 return (error); 1769 } 1770 1771 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_MTIME(zfsvfs), NULL, mtime, 16); 1772 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_CTIME(zfsvfs), NULL, ctime, 16); 1773 SA_ADD_BULK_ATTR(bulk, count, SA_ZPL_FLAGS(zfsvfs), 1774 NULL, &zp->z_pflags, 8); 1775 zfs_tstamp_update_setup(zp, CONTENT_MODIFIED, mtime, ctime, B_TRUE); 1776 error = sa_bulk_update(zp->z_sa_hdl, bulk, count, tx); 1777 ASSERT(error == 0); 1778 1779 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); 1780 1781 dmu_tx_commit(tx); 1782 return (0); 1783} 1784 1785void 1786zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) 1787{ 1788 uint64_t moid, obj, sa_obj, version; 1789 uint64_t sense = ZFS_CASE_SENSITIVE; 1790 uint64_t norm = 0; 1791 nvpair_t *elem; 1792 int error; 1793 int i; 1794 znode_t *rootzp = NULL; 1795 zfsvfs_t *zfsvfs; 1796 vattr_t vattr; 1797 znode_t *zp; 1798 zfs_acl_ids_t acl_ids; 1799 1800 /* 1801 * First attempt to create master node. 1802 */ 1803 /* 1804 * In an empty objset, there are no blocks to read and thus 1805 * there can be no i/o errors (which we assert below). 1806 */ 1807 moid = MASTER_NODE_OBJ; 1808 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE, 1809 DMU_OT_NONE, 0, tx); 1810 ASSERT(error == 0); 1811 1812 /* 1813 * Set starting attributes. 1814 */ 1815 version = zfs_zpl_version_map(spa_version(dmu_objset_spa(os))); 1816 elem = NULL; 1817 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) { 1818 /* For the moment we expect all zpl props to be uint64_ts */ 1819 uint64_t val; 1820 char *name; 1821 1822 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64); 1823 VERIFY(nvpair_value_uint64(elem, &val) == 0); 1824 name = nvpair_name(elem); 1825 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) { 1826 if (val < version) 1827 version = val; 1828 } else { 1829 error = zap_update(os, moid, name, 8, 1, &val, tx); 1830 } 1831 ASSERT(error == 0); 1832 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0) 1833 norm = val; 1834 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0) 1835 sense = val; 1836 } 1837 ASSERT(version != 0); 1838 error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx); 1839 1840 /* 1841 * Create zap object used for SA attribute registration 1842 */ 1843 1844 if (version >= ZPL_VERSION_SA) { 1845 sa_obj = zap_create(os, DMU_OT_SA_MASTER_NODE, 1846 DMU_OT_NONE, 0, tx); 1847 error = zap_add(os, moid, ZFS_SA_ATTRS, 8, 1, &sa_obj, tx); 1848 ASSERT(error == 0); 1849 } else { 1850 sa_obj = 0; 1851 } 1852 /* 1853 * Create a delete queue. 1854 */ 1855 obj = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); 1856 1857 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx); 1858 ASSERT(error == 0); 1859 1860 /* 1861 * Create root znode. Create minimal znode/vnode/zfsvfs 1862 * to allow zfs_mknode to work. 1863 */ 1864 VATTR_NULL(&vattr); 1865 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 1866 vattr.va_type = VDIR; 1867 vattr.va_mode = S_IFDIR|0755; 1868 vattr.va_uid = crgetuid(cr); 1869 vattr.va_gid = crgetgid(cr); 1870 1871 zfsvfs = kmem_zalloc(sizeof (zfsvfs_t), KM_SLEEP); 1872 1873 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP); 1874 ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs)); 1875 rootzp->z_moved = 0; 1876 rootzp->z_unlinked = 0; 1877 rootzp->z_atime_dirty = 0; 1878 rootzp->z_is_sa = USE_SA(version, os); 1879 1880 zfsvfs->z_os = os; 1881 zfsvfs->z_parent = zfsvfs; 1882 zfsvfs->z_version = version; 1883 zfsvfs->z_use_fuids = USE_FUIDS(version, os); 1884 zfsvfs->z_use_sa = USE_SA(version, os); 1885 zfsvfs->z_norm = norm; 1886 1887 error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END, 1888 &zfsvfs->z_attr_table); 1889 1890 ASSERT(error == 0); 1891 1892 /* 1893 * Fold case on file systems that are always or sometimes case 1894 * insensitive. 1895 */ 1896 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED) 1897 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 1898 1899 mutex_init(&zfsvfs->z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 1900 list_create(&zfsvfs->z_all_znodes, sizeof (znode_t), 1901 offsetof(znode_t, z_link_node)); 1902 1903 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1904 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 1905 1906 rootzp->z_zfsvfs = zfsvfs; 1907 VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr, 1908 cr, NULL, &acl_ids)); 1909 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids); 1910 ASSERT3P(zp, ==, rootzp); 1911 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); 1912 ASSERT(error == 0); 1913 zfs_acl_ids_free(&acl_ids); 1914 POINTER_INVALIDATE(&rootzp->z_zfsvfs); 1915 1916 sa_handle_destroy(rootzp->z_sa_hdl); 1917 kmem_cache_free(znode_cache, rootzp); 1918 1919 /* 1920 * Create shares directory 1921 */ 1922 1923 error = zfs_create_share_dir(zfsvfs, tx); 1924 1925 ASSERT(error == 0); 1926 1927 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 1928 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 1929 kmem_free(zfsvfs, sizeof (zfsvfs_t)); 1930} 1931#endif /* _KERNEL */ 1932 1933static int 1934zfs_sa_setup(objset_t *osp, sa_attr_type_t **sa_table) 1935{ 1936 uint64_t sa_obj = 0; 1937 int error; 1938 1939 error = zap_lookup(osp, MASTER_NODE_OBJ, ZFS_SA_ATTRS, 8, 1, &sa_obj); 1940 if (error != 0 && error != ENOENT) 1941 return (error); 1942 1943 error = sa_setup(osp, sa_obj, zfs_attr_table, ZPL_END, sa_table); 1944 return (error); 1945} 1946 1947static int 1948zfs_grab_sa_handle(objset_t *osp, uint64_t obj, sa_handle_t **hdlp, 1949 dmu_buf_t **db, void *tag) 1950{ 1951 dmu_object_info_t doi; 1952 int error; 1953 1954 if ((error = sa_buf_hold(osp, obj, tag, db)) != 0) 1955 return (error); 1956 1957 dmu_object_info_from_db(*db, &doi); 1958 if ((doi.doi_bonus_type != DMU_OT_SA && 1959 doi.doi_bonus_type != DMU_OT_ZNODE) || 1960 doi.doi_bonus_type == DMU_OT_ZNODE && 1961 doi.doi_bonus_size < sizeof (znode_phys_t)) { 1962 sa_buf_rele(*db, tag); 1963 return (SET_ERROR(ENOTSUP)); 1964 } 1965 1966 error = sa_handle_get(osp, obj, NULL, SA_HDL_PRIVATE, hdlp); 1967 if (error != 0) { 1968 sa_buf_rele(*db, tag); 1969 return (error); 1970 } 1971 1972 return (0); 1973} 1974 1975void 1976zfs_release_sa_handle(sa_handle_t *hdl, dmu_buf_t *db, void *tag) 1977{ 1978 sa_handle_destroy(hdl); 1979 sa_buf_rele(db, tag); 1980} 1981 1982/* 1983 * Given an object number, return its parent object number and whether 1984 * or not the object is an extended attribute directory. 1985 */ 1986static int 1987zfs_obj_to_pobj(objset_t *osp, sa_handle_t *hdl, sa_attr_type_t *sa_table, 1988 uint64_t *pobjp, int *is_xattrdir) 1989{ 1990 uint64_t parent; 1991 uint64_t pflags; 1992 uint64_t mode; 1993 uint64_t parent_mode; 1994 sa_bulk_attr_t bulk[3]; 1995 sa_handle_t *sa_hdl; 1996 dmu_buf_t *sa_db; 1997 int count = 0; 1998 int error; 1999 2000 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_PARENT], NULL, 2001 &parent, sizeof (parent)); 2002 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_FLAGS], NULL, 2003 &pflags, sizeof (pflags)); 2004 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2005 &mode, sizeof (mode)); 2006 2007 if ((error = sa_bulk_lookup(hdl, bulk, count)) != 0) 2008 return (error); 2009 2010 /* 2011 * When a link is removed its parent pointer is not changed and will 2012 * be invalid. There are two cases where a link is removed but the 2013 * file stays around, when it goes to the delete queue and when there 2014 * are additional links. 2015 */ 2016 error = zfs_grab_sa_handle(osp, parent, &sa_hdl, &sa_db, FTAG); 2017 if (error != 0) 2018 return (error); 2019 2020 error = sa_lookup(sa_hdl, ZPL_MODE, &parent_mode, sizeof (parent_mode)); 2021 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2022 if (error != 0) 2023 return (error); 2024 2025 *is_xattrdir = ((pflags & ZFS_XATTR) != 0) && S_ISDIR(mode); 2026 2027 /* 2028 * Extended attributes can be applied to files, directories, etc. 2029 * Otherwise the parent must be a directory. 2030 */ 2031 if (!*is_xattrdir && !S_ISDIR(parent_mode)) 2032 return (SET_ERROR(EINVAL)); 2033 2034 *pobjp = parent; 2035 2036 return (0); 2037} 2038 2039/* 2040 * Given an object number, return some zpl level statistics 2041 */ 2042static int 2043zfs_obj_to_stats_impl(sa_handle_t *hdl, sa_attr_type_t *sa_table, 2044 zfs_stat_t *sb) 2045{ 2046 sa_bulk_attr_t bulk[4]; 2047 int count = 0; 2048 2049 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_MODE], NULL, 2050 &sb->zs_mode, sizeof (sb->zs_mode)); 2051 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_GEN], NULL, 2052 &sb->zs_gen, sizeof (sb->zs_gen)); 2053 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_LINKS], NULL, 2054 &sb->zs_links, sizeof (sb->zs_links)); 2055 SA_ADD_BULK_ATTR(bulk, count, sa_table[ZPL_CTIME], NULL, 2056 &sb->zs_ctime, sizeof (sb->zs_ctime)); 2057 2058 return (sa_bulk_lookup(hdl, bulk, count)); 2059} 2060 2061static int 2062zfs_obj_to_path_impl(objset_t *osp, uint64_t obj, sa_handle_t *hdl, 2063 sa_attr_type_t *sa_table, char *buf, int len) 2064{ 2065 sa_handle_t *sa_hdl; 2066 sa_handle_t *prevhdl = NULL; 2067 dmu_buf_t *prevdb = NULL; 2068 dmu_buf_t *sa_db = NULL; 2069 char *path = buf + len - 1; 2070 int error; 2071 2072 *path = '\0'; 2073 sa_hdl = hdl; 2074 2075 for (;;) { 2076 uint64_t pobj; 2077 char component[MAXNAMELEN + 2]; 2078 size_t complen; 2079 int is_xattrdir; 2080 2081 if (prevdb) 2082 zfs_release_sa_handle(prevhdl, prevdb, FTAG); 2083 2084 if ((error = zfs_obj_to_pobj(osp, sa_hdl, sa_table, &pobj, 2085 &is_xattrdir)) != 0) 2086 break; 2087 2088 if (pobj == obj) { 2089 if (path[0] != '/') 2090 *--path = '/'; 2091 break; 2092 } 2093 2094 component[0] = '/'; 2095 if (is_xattrdir) { 2096 (void) sprintf(component + 1, "<xattrdir>"); 2097 } else { 2098 error = zap_value_search(osp, pobj, obj, 2099 ZFS_DIRENT_OBJ(-1ULL), component + 1); 2100 if (error != 0) 2101 break; 2102 } 2103 2104 complen = strlen(component); 2105 path -= complen; 2106 ASSERT(path >= buf); 2107 bcopy(component, path, complen); 2108 obj = pobj; 2109 2110 if (sa_hdl != hdl) { 2111 prevhdl = sa_hdl; 2112 prevdb = sa_db; 2113 } 2114 error = zfs_grab_sa_handle(osp, obj, &sa_hdl, &sa_db, FTAG); 2115 if (error != 0) { 2116 sa_hdl = prevhdl; 2117 sa_db = prevdb; 2118 break; 2119 } 2120 } 2121 2122 if (sa_hdl != NULL && sa_hdl != hdl) { 2123 ASSERT(sa_db != NULL); 2124 zfs_release_sa_handle(sa_hdl, sa_db, FTAG); 2125 } 2126 2127 if (error == 0) 2128 (void) memmove(buf, path, buf + len - path); 2129 2130 return (error); 2131} 2132 2133int 2134zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) 2135{ 2136 sa_attr_type_t *sa_table; 2137 sa_handle_t *hdl; 2138 dmu_buf_t *db; 2139 int error; 2140 2141 error = zfs_sa_setup(osp, &sa_table); 2142 if (error != 0) 2143 return (error); 2144 2145 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2146 if (error != 0) 2147 return (error); 2148 2149 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2150 2151 zfs_release_sa_handle(hdl, db, FTAG); 2152 return (error); 2153} 2154 2155int 2156zfs_obj_to_stats(objset_t *osp, uint64_t obj, zfs_stat_t *sb, 2157 char *buf, int len) 2158{ 2159 char *path = buf + len - 1; 2160 sa_attr_type_t *sa_table; 2161 sa_handle_t *hdl; 2162 dmu_buf_t *db; 2163 int error; 2164 2165 *path = '\0'; 2166 2167 error = zfs_sa_setup(osp, &sa_table); 2168 if (error != 0) 2169 return (error); 2170 2171 error = zfs_grab_sa_handle(osp, obj, &hdl, &db, FTAG); 2172 if (error != 0) 2173 return (error); 2174 2175 error = zfs_obj_to_stats_impl(hdl, sa_table, sb); 2176 if (error != 0) { 2177 zfs_release_sa_handle(hdl, db, FTAG); 2178 return (error); 2179 } 2180 2181 error = zfs_obj_to_path_impl(osp, obj, hdl, sa_table, buf, len); 2182 2183 zfs_release_sa_handle(hdl, db, FTAG); 2184 return (error); 2185} 2186 2187#ifdef _KERNEL 2188int 2189zfs_znode_parent_and_name(znode_t *zp, znode_t **dzpp, char *buf) 2190{ 2191 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 2192 uint64_t parent; 2193 int is_xattrdir; 2194 int err; 2195 2196 /* Extended attributes should not be visible as regular files. */ 2197 if ((zp->z_pflags & ZFS_XATTR) != 0) 2198 return (SET_ERROR(EINVAL)); 2199 2200 err = zfs_obj_to_pobj(zfsvfs->z_os, zp->z_sa_hdl, zfsvfs->z_attr_table, 2201 &parent, &is_xattrdir); 2202 if (err != 0) 2203 return (err); 2204 ASSERT0(is_xattrdir); 2205 2206 /* No name as this is a root object. */ 2207 if (parent == zp->z_id) 2208 return (SET_ERROR(EINVAL)); 2209 2210 err = zap_value_search(zfsvfs->z_os, parent, zp->z_id, 2211 ZFS_DIRENT_OBJ(-1ULL), buf); 2212 if (err != 0) 2213 return (err); 2214 err = zfs_zget(zfsvfs, parent, dzpp); 2215 return (err); 2216} 2217#endif /* _KERNEL */ 2218