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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* Portions Copyright 2007 Jeremy Teo */ 27 28 #pragma ident "%Z%%M% %I% %E% SMI" 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/mkdev.h> 39 #include <sys/u8_textprep.h> 40 #include <sys/vfs.h> 41 #include <sys/vfs_opreg.h> 42 #include <sys/vnode.h> 43 #include <sys/file.h> 44 #include <sys/kmem.h> 45 #include <sys/errno.h> 46 #include <sys/unistd.h> 47 #include <sys/mode.h> 48 #include <sys/atomic.h> 49 #include <vm/pvn.h> 50 #include "fs/fs_subr.h" 51 #include <sys/zfs_dir.h> 52 #include <sys/zfs_acl.h> 53 #include <sys/zfs_ioctl.h> 54 #include <sys/zfs_rlock.h> 55 #include <sys/zfs_fuid.h> 56 #include <sys/fs/zfs.h> 57 #include <sys/kidmap.h> 58 #endif /* _KERNEL */ 59 60 #include <sys/dmu.h> 61 #include <sys/refcount.h> 62 #include <sys/stat.h> 63 #include <sys/zap.h> 64 #include <sys/zfs_znode.h> 65 66 #include "zfs_prop.h" 67 68 /* 69 * Functions needed for userland (ie: libzpool) are not put under 70 * #ifdef_KERNEL; the rest of the functions have dependencies 71 * (such as VFS logic) that will not compile easily in userland. 72 */ 73 #ifdef _KERNEL 74 struct kmem_cache *znode_cache = NULL; 75 76 /*ARGSUSED*/ 77 static void 78 znode_evict_error(dmu_buf_t *dbuf, void *user_ptr) 79 { 80 /* 81 * We should never drop all dbuf refs without first clearing 82 * the eviction callback. 83 */ 84 panic("evicting znode %p\n", user_ptr); 85 } 86 87 /*ARGSUSED*/ 88 static int 89 zfs_znode_cache_constructor(void *buf, void *cdrarg, int kmflags) 90 { 91 znode_t *zp = buf; 92 93 zp->z_vnode = vn_alloc(KM_SLEEP); 94 zp->z_vnode->v_data = (caddr_t)zp; 95 mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL); 96 rw_init(&zp->z_map_lock, NULL, RW_DEFAULT, NULL); 97 rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL); 98 rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL); 99 mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL); 100 101 mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL); 102 avl_create(&zp->z_range_avl, zfs_range_compare, 103 sizeof (rl_t), offsetof(rl_t, r_node)); 104 105 zp->z_dbuf = NULL; 106 zp->z_dirlocks = 0; 107 return (0); 108 } 109 110 /*ARGSUSED*/ 111 static void 112 zfs_znode_cache_destructor(void *buf, void *cdarg) 113 { 114 znode_t *zp = buf; 115 116 ASSERT(zp->z_dirlocks == 0); 117 mutex_destroy(&zp->z_lock); 118 rw_destroy(&zp->z_map_lock); 119 rw_destroy(&zp->z_parent_lock); 120 rw_destroy(&zp->z_name_lock); 121 mutex_destroy(&zp->z_acl_lock); 122 avl_destroy(&zp->z_range_avl); 123 mutex_destroy(&zp->z_range_lock); 124 125 ASSERT(zp->z_dbuf == NULL); 126 ASSERT(ZTOV(zp)->v_count == 0); 127 vn_free(ZTOV(zp)); 128 } 129 130 void 131 zfs_znode_init(void) 132 { 133 /* 134 * Initialize zcache 135 */ 136 ASSERT(znode_cache == NULL); 137 znode_cache = kmem_cache_create("zfs_znode_cache", 138 sizeof (znode_t), 0, zfs_znode_cache_constructor, 139 zfs_znode_cache_destructor, NULL, NULL, NULL, 0); 140 } 141 142 void 143 zfs_znode_fini(void) 144 { 145 /* 146 * Cleanup vfs & vnode ops 147 */ 148 zfs_remove_op_tables(); 149 150 /* 151 * Cleanup zcache 152 */ 153 if (znode_cache) 154 kmem_cache_destroy(znode_cache); 155 znode_cache = NULL; 156 } 157 158 struct vnodeops *zfs_dvnodeops; 159 struct vnodeops *zfs_fvnodeops; 160 struct vnodeops *zfs_symvnodeops; 161 struct vnodeops *zfs_xdvnodeops; 162 struct vnodeops *zfs_evnodeops; 163 164 void 165 zfs_remove_op_tables() 166 { 167 /* 168 * Remove vfs ops 169 */ 170 ASSERT(zfsfstype); 171 (void) vfs_freevfsops_by_type(zfsfstype); 172 zfsfstype = 0; 173 174 /* 175 * Remove vnode ops 176 */ 177 if (zfs_dvnodeops) 178 vn_freevnodeops(zfs_dvnodeops); 179 if (zfs_fvnodeops) 180 vn_freevnodeops(zfs_fvnodeops); 181 if (zfs_symvnodeops) 182 vn_freevnodeops(zfs_symvnodeops); 183 if (zfs_xdvnodeops) 184 vn_freevnodeops(zfs_xdvnodeops); 185 if (zfs_evnodeops) 186 vn_freevnodeops(zfs_evnodeops); 187 188 zfs_dvnodeops = NULL; 189 zfs_fvnodeops = NULL; 190 zfs_symvnodeops = NULL; 191 zfs_xdvnodeops = NULL; 192 zfs_evnodeops = NULL; 193 } 194 195 extern const fs_operation_def_t zfs_dvnodeops_template[]; 196 extern const fs_operation_def_t zfs_fvnodeops_template[]; 197 extern const fs_operation_def_t zfs_xdvnodeops_template[]; 198 extern const fs_operation_def_t zfs_symvnodeops_template[]; 199 extern const fs_operation_def_t zfs_evnodeops_template[]; 200 201 int 202 zfs_create_op_tables() 203 { 204 int error; 205 206 /* 207 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs() 208 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv). 209 * In this case we just return as the ops vectors are already set up. 210 */ 211 if (zfs_dvnodeops) 212 return (0); 213 214 error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template, 215 &zfs_dvnodeops); 216 if (error) 217 return (error); 218 219 error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template, 220 &zfs_fvnodeops); 221 if (error) 222 return (error); 223 224 error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template, 225 &zfs_symvnodeops); 226 if (error) 227 return (error); 228 229 error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template, 230 &zfs_xdvnodeops); 231 if (error) 232 return (error); 233 234 error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template, 235 &zfs_evnodeops); 236 237 return (error); 238 } 239 240 /* 241 * zfs_init_fs - Initialize the zfsvfs struct and the file system 242 * incore "master" object. Verify version compatibility. 243 */ 244 int 245 zfs_init_fs(zfsvfs_t *zfsvfs, znode_t **zpp, cred_t *cr) 246 { 247 extern int zfsfstype; 248 249 objset_t *os = zfsvfs->z_os; 250 int i, error; 251 dmu_object_info_t doi; 252 uint64_t fsid_guid; 253 uint64_t zval; 254 255 *zpp = NULL; 256 257 /* 258 * XXX - hack to auto-create the pool root filesystem at 259 * the first attempted mount. 260 */ 261 if (dmu_object_info(os, MASTER_NODE_OBJ, &doi) == ENOENT) { 262 dmu_tx_t *tx = dmu_tx_create(os); 263 uint64_t zpl_version; 264 nvlist_t *zprops; 265 266 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* master */ 267 dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* del queue */ 268 dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); /* root node */ 269 error = dmu_tx_assign(tx, TXG_WAIT); 270 ASSERT3U(error, ==, 0); 271 if (spa_version(dmu_objset_spa(os)) >= SPA_VERSION_FUID) 272 zpl_version = ZPL_VERSION; 273 else 274 zpl_version = ZPL_VERSION_FUID - 1; 275 276 VERIFY(nvlist_alloc(&zprops, NV_UNIQUE_NAME, KM_SLEEP) == 0); 277 VERIFY(nvlist_add_uint64(zprops, 278 zfs_prop_to_name(ZFS_PROP_VERSION), zpl_version) == 0); 279 zfs_create_fs(os, cr, zprops, tx); 280 nvlist_free(zprops); 281 dmu_tx_commit(tx); 282 } 283 284 error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version); 285 if (error) { 286 return (error); 287 } else if (zfsvfs->z_version > ZPL_VERSION) { 288 (void) printf("Mismatched versions: File system " 289 "is version %llu on-disk format, which is " 290 "incompatible with this software version %lld!", 291 (u_longlong_t)zfsvfs->z_version, ZPL_VERSION); 292 return (ENOTSUP); 293 } 294 295 if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0) 296 return (error); 297 zfsvfs->z_norm = (int)zval; 298 if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0) 299 return (error); 300 zfsvfs->z_utf8 = (zval != 0); 301 if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0) 302 return (error); 303 zfsvfs->z_case = (uint_t)zval; 304 /* 305 * Fold case on file systems that are always or sometimes case 306 * insensitive. 307 */ 308 if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE || 309 zfsvfs->z_case == ZFS_CASE_MIXED) 310 zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER; 311 312 /* 313 * The fsid is 64 bits, composed of an 8-bit fs type, which 314 * separates our fsid from any other filesystem types, and a 315 * 56-bit objset unique ID. The objset unique ID is unique to 316 * all objsets open on this system, provided by unique_create(). 317 * The 8-bit fs type must be put in the low bits of fsid[1] 318 * because that's where other Solaris filesystems put it. 319 */ 320 fsid_guid = dmu_objset_fsid_guid(os); 321 ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0); 322 zfsvfs->z_vfs->vfs_fsid.val[0] = fsid_guid; 323 zfsvfs->z_vfs->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) | 324 zfsfstype & 0xFF; 325 326 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1, 327 &zfsvfs->z_root); 328 if (error) 329 return (error); 330 ASSERT(zfsvfs->z_root != 0); 331 332 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1, 333 &zfsvfs->z_unlinkedobj); 334 if (error) 335 return (error); 336 337 /* 338 * Initialize zget mutex's 339 */ 340 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 341 mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL); 342 343 error = zfs_zget(zfsvfs, zfsvfs->z_root, zpp); 344 if (error) { 345 /* 346 * On error, we destroy the mutexes here since it's not 347 * possible for the caller to determine if the mutexes were 348 * initialized properly. 349 */ 350 for (i = 0; i != ZFS_OBJ_MTX_SZ; i++) 351 mutex_destroy(&zfsvfs->z_hold_mtx[i]); 352 return (error); 353 } 354 ASSERT3U((*zpp)->z_id, ==, zfsvfs->z_root); 355 error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1, 356 &zfsvfs->z_fuid_obj); 357 if (error == ENOENT) 358 error = 0; 359 360 return (0); 361 } 362 363 /* 364 * define a couple of values we need available 365 * for both 64 and 32 bit environments. 366 */ 367 #ifndef NBITSMINOR64 368 #define NBITSMINOR64 32 369 #endif 370 #ifndef MAXMAJ64 371 #define MAXMAJ64 0xffffffffUL 372 #endif 373 #ifndef MAXMIN64 374 #define MAXMIN64 0xffffffffUL 375 #endif 376 377 /* 378 * Create special expldev for ZFS private use. 379 * Can't use standard expldev since it doesn't do 380 * what we want. The standard expldev() takes a 381 * dev32_t in LP64 and expands it to a long dev_t. 382 * We need an interface that takes a dev32_t in ILP32 383 * and expands it to a long dev_t. 384 */ 385 static uint64_t 386 zfs_expldev(dev_t dev) 387 { 388 #ifndef _LP64 389 major_t major = (major_t)dev >> NBITSMINOR32 & MAXMAJ32; 390 return (((uint64_t)major << NBITSMINOR64) | 391 ((minor_t)dev & MAXMIN32)); 392 #else 393 return (dev); 394 #endif 395 } 396 397 /* 398 * Special cmpldev for ZFS private use. 399 * Can't use standard cmpldev since it takes 400 * a long dev_t and compresses it to dev32_t in 401 * LP64. We need to do a compaction of a long dev_t 402 * to a dev32_t in ILP32. 403 */ 404 dev_t 405 zfs_cmpldev(uint64_t dev) 406 { 407 #ifndef _LP64 408 minor_t minor = (minor_t)dev & MAXMIN64; 409 major_t major = (major_t)(dev >> NBITSMINOR64) & MAXMAJ64; 410 411 if (major > MAXMAJ32 || minor > MAXMIN32) 412 return (NODEV32); 413 414 return (((dev32_t)major << NBITSMINOR32) | minor); 415 #else 416 return (dev); 417 #endif 418 } 419 420 static void 421 zfs_znode_dmu_init(znode_t *zp, dmu_buf_t *db) 422 { 423 znode_t *nzp; 424 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 425 426 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp))); 427 428 mutex_enter(&zp->z_lock); 429 430 ASSERT(zp->z_dbuf == NULL); 431 zp->z_dbuf = db; 432 nzp = dmu_buf_set_user_ie(db, zp, &zp->z_phys, znode_evict_error); 433 434 /* 435 * there should be no 436 * concurrent zgets on this object. 437 */ 438 if (nzp != NULL) 439 panic("existing znode %p for dbuf %p", nzp, db); 440 441 /* 442 * Slap on VROOT if we are the root znode 443 */ 444 if (zp->z_id == zfsvfs->z_root) 445 ZTOV(zp)->v_flag |= VROOT; 446 447 mutex_exit(&zp->z_lock); 448 vn_exists(ZTOV(zp)); 449 } 450 451 void 452 zfs_znode_dmu_fini(znode_t *zp) 453 { 454 dmu_buf_t *db = zp->z_dbuf; 455 ASSERT(MUTEX_HELD(ZFS_OBJ_MUTEX(zp)) || 456 RW_WRITE_HELD(&zp->z_zfsvfs->z_teardown_inactive_lock)); 457 ASSERT(zp->z_dbuf != NULL); 458 zp->z_dbuf = NULL; 459 VERIFY(zp == dmu_buf_update_user(db, zp, NULL, NULL, NULL)); 460 dmu_buf_rele(db, NULL); 461 } 462 463 /* 464 * Construct a new znode/vnode and intialize. 465 * 466 * This does not do a call to dmu_set_user() that is 467 * up to the caller to do, in case you don't want to 468 * return the znode 469 */ 470 static znode_t * 471 zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, int blksz) 472 { 473 znode_t *zp; 474 vnode_t *vp; 475 476 zp = kmem_cache_alloc(znode_cache, KM_SLEEP); 477 478 ASSERT(zp->z_dirlocks == NULL); 479 ASSERT(zp->z_dbuf == NULL); 480 481 zp->z_phys = NULL; 482 zp->z_zfsvfs = zfsvfs; 483 zp->z_unlinked = 0; 484 zp->z_atime_dirty = 0; 485 zp->z_mapcnt = 0; 486 zp->z_last_itx = 0; 487 zp->z_id = db->db_object; 488 zp->z_blksz = blksz; 489 zp->z_seq = 0x7A4653; 490 zp->z_sync_cnt = 0; 491 492 vp = ZTOV(zp); 493 vn_reinit(vp); 494 495 zfs_znode_dmu_init(zp, db); 496 497 zp->z_gen = zp->z_phys->zp_gen; 498 499 mutex_enter(&zfsvfs->z_znodes_lock); 500 list_insert_tail(&zfsvfs->z_all_znodes, zp); 501 mutex_exit(&zfsvfs->z_znodes_lock); 502 503 vp->v_vfsp = zfsvfs->z_parent->z_vfs; 504 vp->v_type = IFTOVT((mode_t)zp->z_phys->zp_mode); 505 506 switch (vp->v_type) { 507 case VDIR: 508 if (zp->z_phys->zp_flags & ZFS_XATTR) { 509 vn_setops(vp, zfs_xdvnodeops); 510 vp->v_flag |= V_XATTRDIR; 511 } else { 512 vn_setops(vp, zfs_dvnodeops); 513 } 514 zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */ 515 break; 516 case VBLK: 517 case VCHR: 518 vp->v_rdev = zfs_cmpldev(zp->z_phys->zp_rdev); 519 /*FALLTHROUGH*/ 520 case VFIFO: 521 case VSOCK: 522 case VDOOR: 523 vn_setops(vp, zfs_fvnodeops); 524 break; 525 case VREG: 526 vp->v_flag |= VMODSORT; 527 vn_setops(vp, zfs_fvnodeops); 528 break; 529 case VLNK: 530 vn_setops(vp, zfs_symvnodeops); 531 break; 532 default: 533 vn_setops(vp, zfs_evnodeops); 534 break; 535 } 536 537 VFS_HOLD(zfsvfs->z_vfs); 538 return (zp); 539 } 540 541 /* 542 * Create a new DMU object to hold a zfs znode. 543 * 544 * IN: dzp - parent directory for new znode 545 * vap - file attributes for new znode 546 * tx - dmu transaction id for zap operations 547 * cr - credentials of caller 548 * flag - flags: 549 * IS_ROOT_NODE - new object will be root 550 * IS_XATTR - new object is an attribute 551 * IS_REPLAY - intent log replay 552 * bonuslen - length of bonus buffer 553 * setaclp - File/Dir initial ACL 554 * fuidp - Tracks fuid allocation. 555 * 556 * OUT: zpp - allocated znode 557 * 558 */ 559 void 560 zfs_mknode(znode_t *dzp, vattr_t *vap, dmu_tx_t *tx, cred_t *cr, 561 uint_t flag, znode_t **zpp, int bonuslen, zfs_acl_t *setaclp, 562 zfs_fuid_info_t **fuidp) 563 { 564 dmu_buf_t *db; 565 znode_phys_t *pzp; 566 zfsvfs_t *zfsvfs = dzp->z_zfsvfs; 567 timestruc_t now; 568 uint64_t gen, obj; 569 int err; 570 571 ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE)); 572 573 if (zfsvfs->z_assign >= TXG_INITIAL) { /* ZIL replay */ 574 obj = vap->va_nodeid; 575 flag |= IS_REPLAY; 576 now = vap->va_ctime; /* see zfs_replay_create() */ 577 gen = vap->va_nblocks; /* ditto */ 578 } else { 579 obj = 0; 580 gethrestime(&now); 581 gen = dmu_tx_get_txg(tx); 582 } 583 584 /* 585 * Create a new DMU object. 586 */ 587 /* 588 * There's currently no mechanism for pre-reading the blocks that will 589 * be to needed allocate a new object, so we accept the small chance 590 * that there will be an i/o error and we will fail one of the 591 * assertions below. 592 */ 593 if (vap->va_type == VDIR) { 594 if (flag & IS_REPLAY) { 595 err = zap_create_claim_norm(zfsvfs->z_os, obj, 596 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 597 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); 598 ASSERT3U(err, ==, 0); 599 } else { 600 obj = zap_create_norm(zfsvfs->z_os, 601 zfsvfs->z_norm, DMU_OT_DIRECTORY_CONTENTS, 602 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); 603 } 604 } else { 605 if (flag & IS_REPLAY) { 606 err = dmu_object_claim(zfsvfs->z_os, obj, 607 DMU_OT_PLAIN_FILE_CONTENTS, 0, 608 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); 609 ASSERT3U(err, ==, 0); 610 } else { 611 obj = dmu_object_alloc(zfsvfs->z_os, 612 DMU_OT_PLAIN_FILE_CONTENTS, 0, 613 DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx); 614 } 615 } 616 VERIFY(0 == dmu_bonus_hold(zfsvfs->z_os, obj, NULL, &db)); 617 dmu_buf_will_dirty(db, tx); 618 619 /* 620 * Initialize the znode physical data to zero. 621 */ 622 ASSERT(db->db_size >= sizeof (znode_phys_t)); 623 bzero(db->db_data, db->db_size); 624 pzp = db->db_data; 625 626 /* 627 * If this is the root, fix up the half-initialized parent pointer 628 * to reference the just-allocated physical data area. 629 */ 630 if (flag & IS_ROOT_NODE) { 631 dzp->z_dbuf = db; 632 dzp->z_phys = pzp; 633 dzp->z_id = obj; 634 } 635 636 /* 637 * If parent is an xattr, so am I. 638 */ 639 if (dzp->z_phys->zp_flags & ZFS_XATTR) 640 flag |= IS_XATTR; 641 642 if (vap->va_type == VBLK || vap->va_type == VCHR) { 643 pzp->zp_rdev = zfs_expldev(vap->va_rdev); 644 } 645 646 if (zfsvfs->z_use_fuids) 647 pzp->zp_flags = ZFS_ARCHIVE | ZFS_AV_MODIFIED; 648 649 if (vap->va_type == VDIR) { 650 pzp->zp_size = 2; /* contents ("." and "..") */ 651 pzp->zp_links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1; 652 } 653 654 pzp->zp_parent = dzp->z_id; 655 if (flag & IS_XATTR) 656 pzp->zp_flags |= ZFS_XATTR; 657 658 pzp->zp_gen = gen; 659 660 ZFS_TIME_ENCODE(&now, pzp->zp_crtime); 661 ZFS_TIME_ENCODE(&now, pzp->zp_ctime); 662 663 if (vap->va_mask & AT_ATIME) { 664 ZFS_TIME_ENCODE(&vap->va_atime, pzp->zp_atime); 665 } else { 666 ZFS_TIME_ENCODE(&now, pzp->zp_atime); 667 } 668 669 if (vap->va_mask & AT_MTIME) { 670 ZFS_TIME_ENCODE(&vap->va_mtime, pzp->zp_mtime); 671 } else { 672 ZFS_TIME_ENCODE(&now, pzp->zp_mtime); 673 } 674 675 pzp->zp_mode = MAKEIMODE(vap->va_type, vap->va_mode); 676 if (!(flag & IS_ROOT_NODE)) { 677 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj) 678 *zpp = zfs_znode_alloc(zfsvfs, db, 0); 679 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 680 } else { 681 /* 682 * If we are creating the root node, the "parent" we 683 * passed in is the znode for the root. 684 */ 685 *zpp = dzp; 686 } 687 zfs_perm_init(*zpp, dzp, flag, vap, tx, cr, setaclp, fuidp); 688 } 689 690 void 691 zfs_xvattr_set(znode_t *zp, xvattr_t *xvap) 692 { 693 xoptattr_t *xoap; 694 695 xoap = xva_getxoptattr(xvap); 696 ASSERT(xoap); 697 698 if (XVA_ISSET_REQ(xvap, XAT_CREATETIME)) { 699 ZFS_TIME_ENCODE(&xoap->xoa_createtime, zp->z_phys->zp_crtime); 700 XVA_SET_RTN(xvap, XAT_CREATETIME); 701 } 702 if (XVA_ISSET_REQ(xvap, XAT_READONLY)) { 703 ZFS_ATTR_SET(zp, ZFS_READONLY, xoap->xoa_readonly); 704 XVA_SET_RTN(xvap, XAT_READONLY); 705 } 706 if (XVA_ISSET_REQ(xvap, XAT_HIDDEN)) { 707 ZFS_ATTR_SET(zp, ZFS_HIDDEN, xoap->xoa_hidden); 708 XVA_SET_RTN(xvap, XAT_HIDDEN); 709 } 710 if (XVA_ISSET_REQ(xvap, XAT_SYSTEM)) { 711 ZFS_ATTR_SET(zp, ZFS_SYSTEM, xoap->xoa_system); 712 XVA_SET_RTN(xvap, XAT_SYSTEM); 713 } 714 if (XVA_ISSET_REQ(xvap, XAT_ARCHIVE)) { 715 ZFS_ATTR_SET(zp, ZFS_ARCHIVE, xoap->xoa_archive); 716 XVA_SET_RTN(xvap, XAT_ARCHIVE); 717 } 718 if (XVA_ISSET_REQ(xvap, XAT_IMMUTABLE)) { 719 ZFS_ATTR_SET(zp, ZFS_IMMUTABLE, xoap->xoa_immutable); 720 XVA_SET_RTN(xvap, XAT_IMMUTABLE); 721 } 722 if (XVA_ISSET_REQ(xvap, XAT_NOUNLINK)) { 723 ZFS_ATTR_SET(zp, ZFS_NOUNLINK, xoap->xoa_nounlink); 724 XVA_SET_RTN(xvap, XAT_NOUNLINK); 725 } 726 if (XVA_ISSET_REQ(xvap, XAT_APPENDONLY)) { 727 ZFS_ATTR_SET(zp, ZFS_APPENDONLY, xoap->xoa_appendonly); 728 XVA_SET_RTN(xvap, XAT_APPENDONLY); 729 } 730 if (XVA_ISSET_REQ(xvap, XAT_NODUMP)) { 731 ZFS_ATTR_SET(zp, ZFS_NODUMP, xoap->xoa_nodump); 732 XVA_SET_RTN(xvap, XAT_NODUMP); 733 } 734 if (XVA_ISSET_REQ(xvap, XAT_OPAQUE)) { 735 ZFS_ATTR_SET(zp, ZFS_OPAQUE, xoap->xoa_opaque); 736 XVA_SET_RTN(xvap, XAT_OPAQUE); 737 } 738 if (XVA_ISSET_REQ(xvap, XAT_AV_QUARANTINED)) { 739 ZFS_ATTR_SET(zp, ZFS_AV_QUARANTINED, 740 xoap->xoa_av_quarantined); 741 XVA_SET_RTN(xvap, XAT_AV_QUARANTINED); 742 } 743 if (XVA_ISSET_REQ(xvap, XAT_AV_MODIFIED)) { 744 ZFS_ATTR_SET(zp, ZFS_AV_MODIFIED, xoap->xoa_av_modified); 745 XVA_SET_RTN(xvap, XAT_AV_MODIFIED); 746 } 747 if (XVA_ISSET_REQ(xvap, XAT_AV_SCANSTAMP)) { 748 (void) memcpy(zp->z_phys + 1, xoap->xoa_av_scanstamp, 749 sizeof (xoap->xoa_av_scanstamp)); 750 zp->z_phys->zp_flags |= ZFS_BONUS_SCANSTAMP; 751 XVA_SET_RTN(xvap, XAT_AV_SCANSTAMP); 752 } 753 } 754 755 int 756 zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp) 757 { 758 dmu_object_info_t doi; 759 dmu_buf_t *db; 760 znode_t *zp; 761 int err; 762 763 *zpp = NULL; 764 765 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 766 767 err = dmu_bonus_hold(zfsvfs->z_os, obj_num, NULL, &db); 768 if (err) { 769 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 770 return (err); 771 } 772 773 dmu_object_info_from_db(db, &doi); 774 if (doi.doi_bonus_type != DMU_OT_ZNODE || 775 doi.doi_bonus_size < sizeof (znode_phys_t)) { 776 dmu_buf_rele(db, NULL); 777 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 778 return (EINVAL); 779 } 780 781 zp = dmu_buf_get_user(db); 782 if (zp != NULL) { 783 mutex_enter(&zp->z_lock); 784 785 /* 786 * Since we do immediate eviction of the z_dbuf, we 787 * should never find a dbuf with a znode that doesn't 788 * know about the dbuf. 789 */ 790 ASSERT3P(zp->z_dbuf, ==, db); 791 ASSERT3U(zp->z_id, ==, obj_num); 792 if (zp->z_unlinked) { 793 err = ENOENT; 794 } else { 795 VN_HOLD(ZTOV(zp)); 796 *zpp = zp; 797 err = 0; 798 } 799 dmu_buf_rele(db, NULL); 800 mutex_exit(&zp->z_lock); 801 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 802 return (err); 803 } 804 805 /* 806 * Not found create new znode/vnode 807 */ 808 zp = zfs_znode_alloc(zfsvfs, db, doi.doi_data_block_size); 809 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 810 *zpp = zp; 811 return (0); 812 } 813 814 int 815 zfs_rezget(znode_t *zp) 816 { 817 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 818 dmu_object_info_t doi; 819 dmu_buf_t *db; 820 uint64_t obj_num = zp->z_id; 821 int err; 822 823 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num); 824 825 err = dmu_bonus_hold(zfsvfs->z_os, obj_num, NULL, &db); 826 if (err) { 827 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 828 return (err); 829 } 830 831 dmu_object_info_from_db(db, &doi); 832 if (doi.doi_bonus_type != DMU_OT_ZNODE || 833 doi.doi_bonus_size < sizeof (znode_phys_t)) { 834 dmu_buf_rele(db, NULL); 835 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 836 return (EINVAL); 837 } 838 839 if (((znode_phys_t *)db->db_data)->zp_gen != zp->z_gen) { 840 dmu_buf_rele(db, NULL); 841 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 842 return (EIO); 843 } 844 845 zfs_znode_dmu_init(zp, db); 846 zp->z_unlinked = (zp->z_phys->zp_links == 0); 847 848 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num); 849 850 return (0); 851 } 852 853 void 854 zfs_znode_delete(znode_t *zp, dmu_tx_t *tx) 855 { 856 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 857 uint64_t obj = zp->z_id; 858 859 ZFS_OBJ_HOLD_ENTER(zfsvfs, obj); 860 if (zp->z_phys->zp_acl.z_acl_extern_obj) { 861 VERIFY(0 == dmu_object_free(zfsvfs->z_os, 862 zp->z_phys->zp_acl.z_acl_extern_obj, tx)); 863 } 864 VERIFY(0 == dmu_object_free(zfsvfs->z_os, obj, tx)); 865 zfs_znode_dmu_fini(zp); 866 ZFS_OBJ_HOLD_EXIT(zfsvfs, obj); 867 zfs_znode_free(zp); 868 } 869 870 void 871 zfs_zinactive(znode_t *zp) 872 { 873 vnode_t *vp = ZTOV(zp); 874 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 875 uint64_t z_id = zp->z_id; 876 877 ASSERT(zp->z_dbuf && zp->z_phys); 878 879 /* 880 * Don't allow a zfs_zget() while were trying to release this znode 881 */ 882 ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id); 883 884 mutex_enter(&zp->z_lock); 885 mutex_enter(&vp->v_lock); 886 vp->v_count--; 887 if (vp->v_count > 0 || vn_has_cached_data(vp)) { 888 /* 889 * If the hold count is greater than zero, somebody has 890 * obtained a new reference on this znode while we were 891 * processing it here, so we are done. If we still have 892 * mapped pages then we are also done, since we don't 893 * want to inactivate the znode until the pages get pushed. 894 * 895 * XXX - if vn_has_cached_data(vp) is true, but count == 0, 896 * this seems like it would leave the znode hanging with 897 * no chance to go inactive... 898 */ 899 mutex_exit(&vp->v_lock); 900 mutex_exit(&zp->z_lock); 901 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 902 return; 903 } 904 mutex_exit(&vp->v_lock); 905 906 /* 907 * If this was the last reference to a file with no links, 908 * remove the file from the file system. 909 */ 910 if (zp->z_unlinked) { 911 mutex_exit(&zp->z_lock); 912 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 913 zfs_rmnode(zp); 914 return; 915 } 916 mutex_exit(&zp->z_lock); 917 zfs_znode_dmu_fini(zp); 918 ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id); 919 zfs_znode_free(zp); 920 } 921 922 void 923 zfs_znode_free(znode_t *zp) 924 { 925 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 926 927 vn_invalid(ZTOV(zp)); 928 929 mutex_enter(&zfsvfs->z_znodes_lock); 930 list_remove(&zfsvfs->z_all_znodes, zp); 931 mutex_exit(&zfsvfs->z_znodes_lock); 932 933 kmem_cache_free(znode_cache, zp); 934 935 VFS_RELE(zfsvfs->z_vfs); 936 } 937 938 void 939 zfs_time_stamper_locked(znode_t *zp, uint_t flag, dmu_tx_t *tx) 940 { 941 timestruc_t now; 942 943 ASSERT(MUTEX_HELD(&zp->z_lock)); 944 945 gethrestime(&now); 946 947 if (tx) { 948 dmu_buf_will_dirty(zp->z_dbuf, tx); 949 zp->z_atime_dirty = 0; 950 zp->z_seq++; 951 } else { 952 zp->z_atime_dirty = 1; 953 } 954 955 if (flag & AT_ATIME) 956 ZFS_TIME_ENCODE(&now, zp->z_phys->zp_atime); 957 958 if (flag & AT_MTIME) { 959 ZFS_TIME_ENCODE(&now, zp->z_phys->zp_mtime); 960 if (zp->z_zfsvfs->z_use_fuids) 961 zp->z_phys->zp_flags |= (ZFS_ARCHIVE | ZFS_AV_MODIFIED); 962 } 963 964 if (flag & AT_CTIME) { 965 ZFS_TIME_ENCODE(&now, zp->z_phys->zp_ctime); 966 if (zp->z_zfsvfs->z_use_fuids) 967 zp->z_phys->zp_flags |= ZFS_ARCHIVE; 968 } 969 } 970 971 /* 972 * Update the requested znode timestamps with the current time. 973 * If we are in a transaction, then go ahead and mark the znode 974 * dirty in the transaction so the timestamps will go to disk. 975 * Otherwise, we will get pushed next time the znode is updated 976 * in a transaction, or when this znode eventually goes inactive. 977 * 978 * Why is this OK? 979 * 1 - Only the ACCESS time is ever updated outside of a transaction. 980 * 2 - Multiple consecutive updates will be collapsed into a single 981 * znode update by the transaction grouping semantics of the DMU. 982 */ 983 void 984 zfs_time_stamper(znode_t *zp, uint_t flag, dmu_tx_t *tx) 985 { 986 mutex_enter(&zp->z_lock); 987 zfs_time_stamper_locked(zp, flag, tx); 988 mutex_exit(&zp->z_lock); 989 } 990 991 /* 992 * Grow the block size for a file. 993 * 994 * IN: zp - znode of file to free data in. 995 * size - requested block size 996 * tx - open transaction. 997 * 998 * NOTE: this function assumes that the znode is write locked. 999 */ 1000 void 1001 zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx) 1002 { 1003 int error; 1004 u_longlong_t dummy; 1005 1006 if (size <= zp->z_blksz) 1007 return; 1008 /* 1009 * If the file size is already greater than the current blocksize, 1010 * we will not grow. If there is more than one block in a file, 1011 * the blocksize cannot change. 1012 */ 1013 if (zp->z_blksz && zp->z_phys->zp_size > zp->z_blksz) 1014 return; 1015 1016 error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id, 1017 size, 0, tx); 1018 if (error == ENOTSUP) 1019 return; 1020 ASSERT3U(error, ==, 0); 1021 1022 /* What blocksize did we actually get? */ 1023 dmu_object_size_from_db(zp->z_dbuf, &zp->z_blksz, &dummy); 1024 } 1025 1026 /* 1027 * This is a dummy interface used when pvn_vplist_dirty() should *not* 1028 * be calling back into the fs for a putpage(). E.g.: when truncating 1029 * a file, the pages being "thrown away* don't need to be written out. 1030 */ 1031 /* ARGSUSED */ 1032 static int 1033 zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp, 1034 int flags, cred_t *cr) 1035 { 1036 ASSERT(0); 1037 return (0); 1038 } 1039 1040 /* 1041 * Free space in a file. 1042 * 1043 * IN: zp - znode of file to free data in. 1044 * off - start of section to free. 1045 * len - length of section to free (0 => to EOF). 1046 * flag - current file open mode flags. 1047 * 1048 * RETURN: 0 if success 1049 * error code if failure 1050 */ 1051 int 1052 zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log) 1053 { 1054 vnode_t *vp = ZTOV(zp); 1055 dmu_tx_t *tx; 1056 zfsvfs_t *zfsvfs = zp->z_zfsvfs; 1057 zilog_t *zilog = zfsvfs->z_log; 1058 rl_t *rl; 1059 uint64_t end = off + len; 1060 uint64_t size, new_blksz; 1061 uint64_t pflags = zp->z_phys->zp_flags; 1062 int error; 1063 1064 if ((pflags & (ZFS_IMMUTABLE|ZFS_READONLY)) || 1065 off < zp->z_phys->zp_size && (pflags & ZFS_APPENDONLY)) 1066 return (EPERM); 1067 1068 if (ZTOV(zp)->v_type == VFIFO) 1069 return (0); 1070 1071 /* 1072 * If we will change zp_size then lock the whole file, 1073 * otherwise just lock the range being freed. 1074 */ 1075 if (len == 0 || off + len > zp->z_phys->zp_size) { 1076 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1077 } else { 1078 rl = zfs_range_lock(zp, off, len, RL_WRITER); 1079 /* recheck, in case zp_size changed */ 1080 if (off + len > zp->z_phys->zp_size) { 1081 /* lost race: file size changed, lock whole file */ 1082 zfs_range_unlock(rl); 1083 rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER); 1084 } 1085 } 1086 1087 /* 1088 * Nothing to do if file already at desired length. 1089 */ 1090 size = zp->z_phys->zp_size; 1091 if (len == 0 && size == off && off != 0) { 1092 zfs_range_unlock(rl); 1093 return (0); 1094 } 1095 1096 /* 1097 * Check for any locks in the region to be freed. 1098 */ 1099 if (MANDLOCK(vp, (mode_t)zp->z_phys->zp_mode)) { 1100 uint64_t start = off; 1101 uint64_t extent = len; 1102 1103 if (off > size) { 1104 start = size; 1105 extent += off - size; 1106 } else if (len == 0) { 1107 extent = size - off; 1108 } 1109 if (error = chklock(vp, FWRITE, start, extent, flag, NULL)) { 1110 zfs_range_unlock(rl); 1111 return (error); 1112 } 1113 } 1114 1115 tx = dmu_tx_create(zfsvfs->z_os); 1116 dmu_tx_hold_bonus(tx, zp->z_id); 1117 new_blksz = 0; 1118 if (end > size && 1119 (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) { 1120 /* 1121 * We are growing the file past the current block size. 1122 */ 1123 if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) { 1124 ASSERT(!ISP2(zp->z_blksz)); 1125 new_blksz = MIN(end, SPA_MAXBLOCKSIZE); 1126 } else { 1127 new_blksz = MIN(end, zp->z_zfsvfs->z_max_blksz); 1128 } 1129 dmu_tx_hold_write(tx, zp->z_id, 0, MIN(end, new_blksz)); 1130 } else if (off < size) { 1131 /* 1132 * If len == 0, we are truncating the file. 1133 */ 1134 dmu_tx_hold_free(tx, zp->z_id, off, len ? len : DMU_OBJECT_END); 1135 } 1136 1137 error = dmu_tx_assign(tx, zfsvfs->z_assign); 1138 if (error) { 1139 if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT) 1140 dmu_tx_wait(tx); 1141 dmu_tx_abort(tx); 1142 zfs_range_unlock(rl); 1143 return (error); 1144 } 1145 1146 if (new_blksz) 1147 zfs_grow_blocksize(zp, new_blksz, tx); 1148 1149 if (end > size || len == 0) 1150 zp->z_phys->zp_size = end; 1151 1152 if (off < size) { 1153 objset_t *os = zfsvfs->z_os; 1154 uint64_t rlen = len; 1155 1156 if (len == 0) 1157 rlen = -1; 1158 else if (end > size) 1159 rlen = size - off; 1160 VERIFY(0 == dmu_free_range(os, zp->z_id, off, rlen, tx)); 1161 } 1162 1163 if (log) { 1164 zfs_time_stamper(zp, CONTENT_MODIFIED, tx); 1165 zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len); 1166 } 1167 1168 zfs_range_unlock(rl); 1169 1170 dmu_tx_commit(tx); 1171 1172 /* 1173 * Clear any mapped pages in the truncated region. This has to 1174 * happen outside of the transaction to avoid the possibility of 1175 * a deadlock with someone trying to push a page that we are 1176 * about to invalidate. 1177 */ 1178 rw_enter(&zp->z_map_lock, RW_WRITER); 1179 if (off < size && vn_has_cached_data(vp)) { 1180 page_t *pp; 1181 uint64_t start = off & PAGEMASK; 1182 int poff = off & PAGEOFFSET; 1183 1184 if (poff != 0 && (pp = page_lookup(vp, start, SE_SHARED))) { 1185 /* 1186 * We need to zero a partial page. 1187 */ 1188 pagezero(pp, poff, PAGESIZE - poff); 1189 start += PAGESIZE; 1190 page_unlock(pp); 1191 } 1192 error = pvn_vplist_dirty(vp, start, zfs_no_putpage, 1193 B_INVAL | B_TRUNC, NULL); 1194 ASSERT(error == 0); 1195 } 1196 rw_exit(&zp->z_map_lock); 1197 1198 return (0); 1199 } 1200 1201 void 1202 zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx) 1203 { 1204 zfsvfs_t zfsvfs; 1205 uint64_t moid, doid; 1206 uint64_t version = 0; 1207 uint64_t sense = ZFS_CASE_SENSITIVE; 1208 uint64_t norm = 0; 1209 nvpair_t *elem; 1210 int error; 1211 znode_t *rootzp = NULL; 1212 vnode_t *vp; 1213 vattr_t vattr; 1214 znode_t *zp; 1215 1216 /* 1217 * First attempt to create master node. 1218 */ 1219 /* 1220 * In an empty objset, there are no blocks to read and thus 1221 * there can be no i/o errors (which we assert below). 1222 */ 1223 moid = MASTER_NODE_OBJ; 1224 error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE, 1225 DMU_OT_NONE, 0, tx); 1226 ASSERT(error == 0); 1227 1228 /* 1229 * Set starting attributes. 1230 */ 1231 elem = NULL; 1232 while ((elem = nvlist_next_nvpair(zplprops, elem)) != NULL) { 1233 /* For the moment we expect all zpl props to be uint64_ts */ 1234 uint64_t val; 1235 char *name; 1236 1237 ASSERT(nvpair_type(elem) == DATA_TYPE_UINT64); 1238 VERIFY(nvpair_value_uint64(elem, &val) == 0); 1239 name = nvpair_name(elem); 1240 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_VERSION)) == 0) { 1241 version = val; 1242 error = zap_update(os, moid, ZPL_VERSION_STR, 1243 8, 1, &version, tx); 1244 } else { 1245 error = zap_update(os, moid, name, 8, 1, &val, tx); 1246 } 1247 ASSERT(error == 0); 1248 if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0) 1249 norm = val; 1250 else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0) 1251 sense = val; 1252 } 1253 ASSERT(version != 0); 1254 1255 /* 1256 * Create a delete queue. 1257 */ 1258 doid = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx); 1259 1260 error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &doid, tx); 1261 ASSERT(error == 0); 1262 1263 /* 1264 * Create root znode. Create minimal znode/vnode/zfsvfs 1265 * to allow zfs_mknode to work. 1266 */ 1267 vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE; 1268 vattr.va_type = VDIR; 1269 vattr.va_mode = S_IFDIR|0755; 1270 vattr.va_uid = crgetuid(cr); 1271 vattr.va_gid = crgetgid(cr); 1272 1273 rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP); 1274 rootzp->z_zfsvfs = &zfsvfs; 1275 rootzp->z_unlinked = 0; 1276 rootzp->z_atime_dirty = 0; 1277 1278 vp = ZTOV(rootzp); 1279 vn_reinit(vp); 1280 vp->v_type = VDIR; 1281 1282 bzero(&zfsvfs, sizeof (zfsvfs_t)); 1283 1284 zfsvfs.z_os = os; 1285 zfsvfs.z_assign = TXG_NOWAIT; 1286 zfsvfs.z_parent = &zfsvfs; 1287 zfsvfs.z_version = version; 1288 zfsvfs.z_use_fuids = USE_FUIDS(version, os); 1289 zfsvfs.z_norm = norm; 1290 /* 1291 * Fold case on file systems that are always or sometimes case 1292 * insensitive. 1293 */ 1294 if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED) 1295 zfsvfs.z_norm |= U8_TEXTPREP_TOUPPER; 1296 1297 mutex_init(&zfsvfs.z_znodes_lock, NULL, MUTEX_DEFAULT, NULL); 1298 list_create(&zfsvfs.z_all_znodes, sizeof (znode_t), 1299 offsetof(znode_t, z_link_node)); 1300 1301 zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, 0, NULL, NULL); 1302 ASSERT3P(zp, ==, rootzp); 1303 error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx); 1304 ASSERT(error == 0); 1305 1306 ZTOV(rootzp)->v_count = 0; 1307 dmu_buf_rele(rootzp->z_dbuf, NULL); 1308 rootzp->z_dbuf = NULL; 1309 kmem_cache_free(znode_cache, rootzp); 1310 } 1311 1312 #endif /* _KERNEL */ 1313 /* 1314 * Given an object number, return its parent object number and whether 1315 * or not the object is an extended attribute directory. 1316 */ 1317 static int 1318 zfs_obj_to_pobj(objset_t *osp, uint64_t obj, uint64_t *pobjp, int *is_xattrdir) 1319 { 1320 dmu_buf_t *db; 1321 dmu_object_info_t doi; 1322 znode_phys_t *zp; 1323 int error; 1324 1325 if ((error = dmu_bonus_hold(osp, obj, FTAG, &db)) != 0) 1326 return (error); 1327 1328 dmu_object_info_from_db(db, &doi); 1329 if (doi.doi_bonus_type != DMU_OT_ZNODE || 1330 doi.doi_bonus_size < sizeof (znode_phys_t)) { 1331 dmu_buf_rele(db, FTAG); 1332 return (EINVAL); 1333 } 1334 1335 zp = db->db_data; 1336 *pobjp = zp->zp_parent; 1337 *is_xattrdir = ((zp->zp_flags & ZFS_XATTR) != 0) && 1338 S_ISDIR(zp->zp_mode); 1339 dmu_buf_rele(db, FTAG); 1340 1341 return (0); 1342 } 1343 1344 int 1345 zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len) 1346 { 1347 char *path = buf + len - 1; 1348 int error; 1349 1350 *path = '\0'; 1351 1352 for (;;) { 1353 uint64_t pobj; 1354 char component[MAXNAMELEN + 2]; 1355 size_t complen; 1356 int is_xattrdir; 1357 1358 if ((error = zfs_obj_to_pobj(osp, obj, &pobj, 1359 &is_xattrdir)) != 0) 1360 break; 1361 1362 if (pobj == obj) { 1363 if (path[0] != '/') 1364 *--path = '/'; 1365 break; 1366 } 1367 1368 component[0] = '/'; 1369 if (is_xattrdir) { 1370 (void) sprintf(component + 1, "<xattrdir>"); 1371 } else { 1372 error = zap_value_search(osp, pobj, obj, 1373 ZFS_DIRENT_OBJ(-1ULL), component + 1); 1374 if (error != 0) 1375 break; 1376 } 1377 1378 complen = strlen(component); 1379 path -= complen; 1380 ASSERT(path >= buf); 1381 bcopy(component, path, complen); 1382 obj = pobj; 1383 } 1384 1385 if (error == 0) 1386 (void) memmove(buf, path, buf + len - path); 1387 return (error); 1388 } 1389