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 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * ZFS volume emulation driver. 28 * 29 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 30 * Volumes are accessed through the symbolic links named: 31 * 32 * /dev/zvol/dsk/<pool_name>/<dataset_name> 33 * /dev/zvol/rdsk/<pool_name>/<dataset_name> 34 * 35 * These links are created by the /dev filesystem (sdev_zvolops.c). 36 * Volumes are persistent through reboot. No user command needs to be 37 * run before opening and using a device. 38 */ 39 40 #include <sys/types.h> 41 #include <sys/param.h> 42 #include <sys/errno.h> 43 #include <sys/uio.h> 44 #include <sys/buf.h> 45 #include <sys/modctl.h> 46 #include <sys/open.h> 47 #include <sys/kmem.h> 48 #include <sys/conf.h> 49 #include <sys/cmn_err.h> 50 #include <sys/stat.h> 51 #include <sys/zap.h> 52 #include <sys/spa.h> 53 #include <sys/zio.h> 54 #include <sys/dmu_traverse.h> 55 #include <sys/dnode.h> 56 #include <sys/dsl_dataset.h> 57 #include <sys/dsl_prop.h> 58 #include <sys/dkio.h> 59 #include <sys/efi_partition.h> 60 #include <sys/byteorder.h> 61 #include <sys/pathname.h> 62 #include <sys/ddi.h> 63 #include <sys/sunddi.h> 64 #include <sys/crc32.h> 65 #include <sys/dirent.h> 66 #include <sys/policy.h> 67 #include <sys/fs/zfs.h> 68 #include <sys/zfs_ioctl.h> 69 #include <sys/mkdev.h> 70 #include <sys/zil.h> 71 #include <sys/refcount.h> 72 #include <sys/zfs_znode.h> 73 #include <sys/zfs_rlock.h> 74 #include <sys/vdev_disk.h> 75 #include <sys/vdev_impl.h> 76 #include <sys/zvol.h> 77 #include <sys/disk.h> 78 #include <sys/dkio.h> 79 #include <sys/disklabel.h> 80 81 #ifdef __NetBSD__ 82 #include <prop/proplib.h> 83 #endif 84 #include <sys/zil_impl.h> 85 86 #include "zfs_namecheck.h" 87 88 static void *zvol_state; 89 static char *zvol_tag = "zvol_tag"; 90 91 #define ZVOL_DUMPSIZE "dumpsize" 92 93 void zvol_minphys(struct buf *); 94 95 static struct dkdriver zvol_dkdriver = { zvol_strategy, zvol_minphys }; 96 97 /* 98 * This lock protects the zvol_state structure from being modified 99 * while it's being used, e.g. an open that comes in before a create 100 * finishes. It also protects temporary opens of the dataset so that, 101 * e.g., an open doesn't get a spurious EBUSY. 102 */ 103 static kmutex_t zvol_state_lock; 104 static uint32_t zvol_minors; 105 106 typedef struct zvol_extent { 107 list_node_t ze_node; 108 dva_t ze_dva; /* dva associated with this extent */ 109 uint64_t ze_nblks; /* number of blocks in extent */ 110 } zvol_extent_t; 111 112 /* 113 * The in-core state of each volume. 114 */ 115 typedef struct zvol_state { 116 char zv_name[MAXPATHLEN]; /* pool/dd name */ 117 uint64_t zv_volsize; /* amount of space we advertise */ 118 uint64_t zv_volblocksize; /* volume block size */ 119 minor_t zv_minor; /* minor number */ 120 uint8_t zv_min_bs; /* minimum addressable block shift */ 121 uint8_t zv_flags; /* readonly, dumpified, etc. */ 122 objset_t *zv_objset; /* objset handle */ 123 uint32_t zv_open_count[OTYPCNT]; /* open counts */ 124 uint32_t zv_total_opens; /* total open count */ 125 zilog_t *zv_zilog; /* ZIL handle */ 126 list_t zv_extents; /* List of extents for dump */ 127 znode_t zv_znode; /* for range locking */ 128 #ifdef __NetBSD__ 129 struct disk zv_dk; /* disk statistics */ 130 kmutex_t zv_dklock; /* disk statistics */ 131 #endif 132 } zvol_state_t; 133 134 /* 135 * zvol specific flags 136 */ 137 #define ZVOL_RDONLY 0x1 138 #define ZVOL_DUMPIFIED 0x2 139 #define ZVOL_EXCL 0x4 140 #define ZVOL_WCE 0x8 141 142 /* 143 * zvol maximum transfer in one DMU tx. 144 */ 145 int zvol_maxphys = DMU_MAX_ACCESS/2; 146 147 extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 148 nvlist_t *, nvlist_t **); 149 static int zvol_remove_zv(zvol_state_t *); 150 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 151 static int zvol_dumpify(zvol_state_t *zv); 152 static int zvol_dump_fini(zvol_state_t *zv); 153 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 154 155 static void 156 zvol_size_changed(zvol_state_t *zv) 157 { 158 prop_dictionary_t disk_info, odisk_info, geom; 159 struct disk *disk; 160 161 disk = &zv->zv_dk; 162 163 disk_info = prop_dictionary_create(); 164 geom = prop_dictionary_create(); 165 166 prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI"); 167 prop_dictionary_set_uint64(geom, "sectors-per-unit", zv->zv_volsize); 168 prop_dictionary_set_uint32(geom, "sector-size", 169 DEV_BSIZE /* XXX 512? */); 170 prop_dictionary_set_uint32(geom, "sectors-per-track", 32); 171 prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64); 172 prop_dictionary_set_uint32(geom, "cylinders-per-unit", zv->zv_volsize / 2048); 173 prop_dictionary_set(disk_info, "geometry", geom); 174 prop_object_release(geom); 175 176 odisk_info = disk->dk_info; 177 disk->dk_info = disk_info; 178 179 if (odisk_info != NULL) 180 prop_object_release(odisk_info); 181 } 182 183 int 184 zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 185 { 186 if (volsize == 0) 187 return (EINVAL); 188 189 if (volsize % blocksize != 0) 190 return (EINVAL); 191 192 #if 0 193 #ifdef _ILP32 194 if (volsize - 1 > SPEC_MAXOFFSET_T) 195 return (EOVERFLOW); 196 #endif 197 #endif 198 return (0); 199 } 200 201 int 202 zvol_check_volblocksize(uint64_t volblocksize) 203 { 204 if (volblocksize < SPA_MINBLOCKSIZE || 205 volblocksize > SPA_MAXBLOCKSIZE || 206 !ISP2(volblocksize)) 207 return (EDOM); 208 209 return (0); 210 } 211 212 int 213 zvol_get_stats(objset_t *os, nvlist_t *nv) 214 { 215 int error; 216 dmu_object_info_t doi; 217 uint64_t val; 218 219 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 220 if (error) 221 return (error); 222 223 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 224 225 error = dmu_object_info(os, ZVOL_OBJ, &doi); 226 227 if (error == 0) { 228 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 229 doi.doi_data_block_size); 230 } 231 232 return (error); 233 } 234 235 /* 236 * Find a free minor number. 237 */ 238 static minor_t 239 zvol_minor_alloc(void) 240 { 241 minor_t minor; 242 243 ASSERT(MUTEX_HELD(&zvol_state_lock)); 244 245 for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 246 if (ddi_get_soft_state(zvol_state, minor) == NULL) 247 return (minor); 248 249 return (0); 250 } 251 252 static zvol_state_t * 253 zvol_minor_lookup(const char *name) 254 { 255 minor_t minor; 256 zvol_state_t *zv; 257 258 ASSERT(MUTEX_HELD(&zvol_state_lock)); 259 260 for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 261 zv = ddi_get_soft_state(zvol_state, minor); 262 if (zv == NULL) 263 continue; 264 if (strcmp(zv->zv_name, name) == 0) 265 break; 266 } 267 268 return (zv); 269 } 270 271 /* extent mapping arg */ 272 struct maparg { 273 zvol_state_t *ma_zv; 274 uint64_t ma_blks; 275 }; 276 277 /*ARGSUSED*/ 278 static int 279 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 280 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) 281 { 282 struct maparg *ma = arg; 283 zvol_extent_t *ze; 284 int bs = ma->ma_zv->zv_volblocksize; 285 286 if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 287 return (0); 288 289 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 290 ma->ma_blks++; 291 292 /* Abort immediately if we have encountered gang blocks */ 293 if (BP_IS_GANG(bp)) 294 return (EFRAGS); 295 296 /* 297 * See if the block is at the end of the previous extent. 298 */ 299 ze = list_tail(&ma->ma_zv->zv_extents); 300 if (ze && 301 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 302 DVA_GET_OFFSET(BP_IDENTITY(bp)) == 303 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 304 ze->ze_nblks++; 305 return (0); 306 } 307 308 dprintf_bp(bp, "%s", "next blkptr:"); 309 310 /* start a new extent */ 311 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 312 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 313 ze->ze_nblks = 1; 314 list_insert_tail(&ma->ma_zv->zv_extents, ze); 315 return (0); 316 } 317 318 static void 319 zvol_free_extents(zvol_state_t *zv) 320 { 321 zvol_extent_t *ze; 322 323 while (ze = list_head(&zv->zv_extents)) { 324 list_remove(&zv->zv_extents, ze); 325 kmem_free(ze, sizeof (zvol_extent_t)); 326 } 327 } 328 329 static int 330 zvol_get_lbas(zvol_state_t *zv) 331 { 332 objset_t *os = zv->zv_objset; 333 struct maparg ma; 334 int err; 335 336 ma.ma_zv = zv; 337 ma.ma_blks = 0; 338 zvol_free_extents(zv); 339 340 /* commit any in-flight changes before traversing the dataset */ 341 txg_wait_synced(dmu_objset_pool(os), 0); 342 err = traverse_dataset(dmu_objset_ds(os), 0, 343 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 344 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 345 zvol_free_extents(zv); 346 return (err ? err : EIO); 347 } 348 349 return (0); 350 } 351 352 /* ARGSUSED */ 353 void 354 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 355 { 356 zfs_creat_t *zct = arg; 357 nvlist_t *nvprops = zct->zct_props; 358 int error; 359 uint64_t volblocksize, volsize; 360 361 VERIFY(nvlist_lookup_uint64(nvprops, 362 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 363 if (nvlist_lookup_uint64(nvprops, 364 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 365 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 366 367 /* 368 * These properties must be removed from the list so the generic 369 * property setting step won't apply to them. 370 */ 371 VERIFY(nvlist_remove_all(nvprops, 372 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 373 (void) nvlist_remove_all(nvprops, 374 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 375 376 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 377 DMU_OT_NONE, 0, tx); 378 ASSERT(error == 0); 379 380 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 381 DMU_OT_NONE, 0, tx); 382 ASSERT(error == 0); 383 384 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 385 ASSERT(error == 0); 386 } 387 388 /* 389 * Replay a TX_WRITE ZIL transaction that didn't get committed 390 * after a system failure 391 */ 392 static int 393 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 394 { 395 objset_t *os = zv->zv_objset; 396 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 397 uint64_t offset, length; 398 dmu_tx_t *tx; 399 int error; 400 401 if (byteswap) 402 byteswap_uint64_array(lr, sizeof (*lr)); 403 404 offset = lr->lr_offset; 405 length = lr->lr_length; 406 407 /* If it's a dmu_sync() block, write the whole block */ 408 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 409 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 410 if (length < blocksize) { 411 offset -= offset % blocksize; 412 length = blocksize; 413 } 414 } 415 416 tx = dmu_tx_create(os); 417 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 418 error = dmu_tx_assign(tx, TXG_WAIT); 419 if (error) { 420 dmu_tx_abort(tx); 421 } else { 422 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 423 dmu_tx_commit(tx); 424 } 425 426 return (error); 427 } 428 429 /* ARGSUSED */ 430 static int 431 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 432 { 433 return (ENOTSUP); 434 } 435 436 /* 437 * Callback vectors for replaying records. 438 * Only TX_WRITE is needed for zvol. 439 */ 440 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 441 zvol_replay_err, /* 0 no such transaction type */ 442 zvol_replay_err, /* TX_CREATE */ 443 zvol_replay_err, /* TX_MKDIR */ 444 zvol_replay_err, /* TX_MKXATTR */ 445 zvol_replay_err, /* TX_SYMLINK */ 446 zvol_replay_err, /* TX_REMOVE */ 447 zvol_replay_err, /* TX_RMDIR */ 448 zvol_replay_err, /* TX_LINK */ 449 zvol_replay_err, /* TX_RENAME */ 450 zvol_replay_write, /* TX_WRITE */ 451 zvol_replay_err, /* TX_TRUNCATE */ 452 zvol_replay_err, /* TX_SETATTR */ 453 zvol_replay_err, /* TX_ACL */ 454 zvol_replay_err, /* TX_CREATE_ACL */ 455 zvol_replay_err, /* TX_CREATE_ATTR */ 456 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 457 zvol_replay_err, /* TX_MKDIR_ACL */ 458 zvol_replay_err, /* TX_MKDIR_ATTR */ 459 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 460 zvol_replay_err, /* TX_WRITE2 */ 461 }; 462 463 int 464 zvol_name2minor(const char *name, minor_t *minor) 465 { 466 zvol_state_t *zv; 467 468 mutex_enter(&zvol_state_lock); 469 zv = zvol_minor_lookup(name); 470 if (minor && zv) 471 *minor = zv->zv_minor; 472 mutex_exit(&zvol_state_lock); 473 return (zv ? 0 : -1); 474 } 475 476 /* 477 * Create a minor node (plus a whole lot more) for the specified volume. 478 */ 479 int 480 zvol_create_minor(const char *name) 481 { 482 zvol_state_t *zv; 483 objset_t *os; 484 dmu_object_info_t doi; 485 minor_t minor = 0; 486 vnode_t *vp = NULL; 487 char *devpath; 488 size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1; 489 490 int error; 491 492 mutex_enter(&zvol_state_lock); 493 494 if (zvol_minor_lookup(name) != NULL) { 495 mutex_exit(&zvol_state_lock); 496 return (EEXIST); 497 } 498 499 /* lie and say we're read-only */ 500 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, zvol_tag, &os); 501 502 if (error) { 503 mutex_exit(&zvol_state_lock); 504 return (error); 505 } 506 507 /* 508 * If there's an existing /dev/zvol symlink, try to use the 509 * same minor number we used last time. 510 */ 511 devpath = kmem_alloc(devpathlen, KM_SLEEP); 512 513 /* Get full path to ZFS volume disk device */ 514 (void) snprintf(devpath, devpathlen, "%s/%s", ZVOL_FULL_DEV_DIR, name); 515 516 error = lookupname(devpath, UIO_SYSSPACE, NULL, &vp); 517 518 if (error == 0 && vp->v_type != VBLK) { 519 error = EINVAL; 520 } 521 522 if (error == 0) { 523 struct stat sb; 524 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 525 error = vn_stat(vp, &sb); 526 VOP_UNLOCK(vp); 527 if (error == 0) { 528 minor = getminor(sb.st_rdev); 529 } 530 } 531 532 if (vp != NULL) 533 VN_RELE(vp); 534 535 /* 536 * If we found a minor but it's already in use, we must pick a new one. 537 */ 538 if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 539 minor = 0; 540 541 if (minor == 0) 542 minor = zvol_minor_alloc(); 543 544 if (minor == 0) { 545 dmu_objset_disown(os, zvol_tag); 546 mutex_exit(&zvol_state_lock); 547 kmem_free(devpath, devpathlen); 548 return (ENXIO); 549 } 550 551 if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 552 dmu_objset_disown(os, zvol_tag); 553 mutex_exit(&zvol_state_lock); 554 kmem_free(devpath, devpathlen); 555 return (EAGAIN); 556 } 557 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 558 (char *)name); 559 560 if (ddi_create_minor_node(zfs_dip, (char *)name, S_IFCHR, 561 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 562 ddi_soft_state_free(zvol_state, minor); 563 dmu_objset_disown(os, zvol_tag); 564 mutex_exit(&zvol_state_lock); 565 kmem_free(devpath, devpathlen); 566 return (EAGAIN); 567 } 568 569 if (ddi_create_minor_node(zfs_dip, (char *)name, S_IFBLK, 570 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 571 ddi_remove_minor_node(zfs_dip, (char *)name); 572 ddi_soft_state_free(zvol_state, minor); 573 dmu_objset_disown(os, zvol_tag); 574 mutex_exit(&zvol_state_lock); 575 kmem_free(devpath, devpathlen); 576 return (EAGAIN); 577 } 578 zv = ddi_get_soft_state(zvol_state, minor); 579 580 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 581 zv->zv_min_bs = DEV_BSHIFT; 582 zv->zv_minor = minor; 583 zv->zv_objset = os; 584 if (dmu_objset_is_snapshot(os)) 585 zv->zv_flags |= ZVOL_RDONLY; 586 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 587 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 588 sizeof (rl_t), offsetof(rl_t, r_node)); 589 list_create(&zv->zv_extents, sizeof (zvol_extent_t), 590 offsetof(zvol_extent_t, ze_node)); 591 /* get and cache the blocksize */ 592 error = dmu_object_info(os, ZVOL_OBJ, &doi); 593 ASSERT(error == 0); 594 zv->zv_volblocksize = doi.doi_data_block_size; 595 596 disk_init(&zv->zv_dk, name, &zvol_dkdriver); 597 disk_attach(&zv->zv_dk); 598 mutex_init(&zv->zv_dklock, NULL, MUTEX_DEFAULT, NULL); 599 600 zil_replay(os, zv, zvol_replay_vector); 601 dmu_objset_disown(os, zvol_tag); 602 zv->zv_objset = NULL; 603 604 zvol_size_changed(zv); 605 606 zvol_minors++; 607 608 mutex_exit(&zvol_state_lock); 609 610 // kmem_free(devpath, devpathlen); 611 612 return (0); 613 } 614 615 /* 616 * Remove minor node for the specified volume. 617 */ 618 static int 619 zvol_remove_zv(zvol_state_t *zv) 620 { 621 char nmbuf[20]; 622 623 ASSERT(MUTEX_HELD(&zvol_state_lock)); 624 if (zv->zv_total_opens != 0) 625 return (EBUSY); 626 627 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", zv->zv_minor); 628 ddi_remove_minor_node(zfs_dip, nmbuf); 629 630 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", zv->zv_minor); 631 ddi_remove_minor_node(zfs_dip, nmbuf); 632 633 avl_destroy(&zv->zv_znode.z_range_avl); 634 mutex_destroy(&zv->zv_znode.z_range_lock); 635 636 ddi_soft_state_free(zvol_state, zv->zv_minor); 637 638 zvol_minors--; 639 return (0); 640 } 641 642 int 643 zvol_remove_minor(const char *name) 644 { 645 zvol_state_t *zv; 646 int rc; 647 648 mutex_enter(&zvol_state_lock); 649 if ((zv = zvol_minor_lookup(name)) == NULL) { 650 mutex_exit(&zvol_state_lock); 651 return (ENXIO); 652 } 653 rc = zvol_remove_zv(zv); 654 mutex_exit(&zvol_state_lock); 655 return (rc); 656 } 657 658 int 659 zvol_first_open(zvol_state_t *zv) 660 { 661 objset_t *os; 662 uint64_t volsize; 663 int error; 664 uint64_t readonly; 665 666 /* lie and say we're read-only */ 667 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 668 zvol_tag, &os); 669 if (error) 670 return (error); 671 672 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 673 if (error) { 674 ASSERT(error == 0); 675 dmu_objset_disown(os, zvol_tag); 676 return (error); 677 } 678 zv->zv_objset = os; 679 zv->zv_volsize = volsize; 680 zv->zv_zilog = zil_open(os, zvol_get_data); 681 zvol_size_changed(zv); 682 683 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 684 NULL) == 0); 685 if (readonly || dmu_objset_is_snapshot(os)) 686 zv->zv_flags |= ZVOL_RDONLY; 687 else 688 zv->zv_flags &= ~ZVOL_RDONLY; 689 return (error); 690 } 691 692 void 693 zvol_last_close(zvol_state_t *zv) 694 { 695 zil_close(zv->zv_zilog); 696 zv->zv_zilog = NULL; 697 dmu_objset_disown(zv->zv_objset, zvol_tag); 698 zv->zv_objset = NULL; 699 #ifdef __NetBSD__ 700 disk_detach(&zv->zv_dk); 701 disk_destroy(&zv->zv_dk); 702 mutex_destroy(&zv->zv_dklock); 703 #endif 704 return; 705 } 706 707 int 708 zvol_prealloc(zvol_state_t *zv) 709 { 710 objset_t *os = zv->zv_objset; 711 dmu_tx_t *tx; 712 uint64_t refd, avail, usedobjs, availobjs; 713 uint64_t resid = zv->zv_volsize; 714 uint64_t off = 0; 715 716 /* Check the space usage before attempting to allocate the space */ 717 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 718 if (avail < zv->zv_volsize) 719 return (ENOSPC); 720 721 /* Free old extents if they exist */ 722 zvol_free_extents(zv); 723 724 while (resid != 0) { 725 int error; 726 uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); 727 728 tx = dmu_tx_create(os); 729 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 730 error = dmu_tx_assign(tx, TXG_WAIT); 731 if (error) { 732 dmu_tx_abort(tx); 733 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 734 return (error); 735 } 736 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 737 dmu_tx_commit(tx); 738 off += bytes; 739 resid -= bytes; 740 } 741 txg_wait_synced(dmu_objset_pool(os), 0); 742 743 return (0); 744 } 745 746 int 747 zvol_update_volsize(objset_t *os, uint64_t volsize) 748 { 749 dmu_tx_t *tx; 750 int error; 751 752 ASSERT(MUTEX_HELD(&zvol_state_lock)); 753 754 tx = dmu_tx_create(os); 755 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 756 error = dmu_tx_assign(tx, TXG_WAIT); 757 if (error) { 758 dmu_tx_abort(tx); 759 return (error); 760 } 761 762 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 763 &volsize, tx); 764 dmu_tx_commit(tx); 765 766 if (error == 0) 767 error = dmu_free_long_range(os, 768 ZVOL_OBJ, volsize, DMU_OBJECT_END); 769 return (error); 770 } 771 772 void 773 zvol_remove_minors(const char *name) 774 { 775 zvol_state_t *zv; 776 char *namebuf; 777 minor_t minor; 778 779 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 780 (void) strncpy(namebuf, name, strlen(name)); 781 (void) strcat(namebuf, "/"); 782 mutex_enter(&zvol_state_lock); 783 for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 784 785 zv = ddi_get_soft_state(zvol_state, minor); 786 if (zv == NULL) 787 continue; 788 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 789 (void) zvol_remove_zv(zv); 790 } 791 kmem_free(namebuf, strlen(name) + 2); 792 793 mutex_exit(&zvol_state_lock); 794 } 795 796 int 797 zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 798 { 799 zvol_state_t *zv = NULL; 800 objset_t *os; 801 int error; 802 dmu_object_info_t doi; 803 uint64_t old_volsize = 0ULL; 804 uint64_t readonly; 805 806 mutex_enter(&zvol_state_lock); 807 zv = zvol_minor_lookup(name); 808 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 809 mutex_exit(&zvol_state_lock); 810 return (error); 811 } 812 813 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 814 (error = zvol_check_volsize(volsize, 815 doi.doi_data_block_size)) != 0) 816 goto out; 817 818 VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, 819 NULL) == 0); 820 if (readonly) { 821 error = EROFS; 822 goto out; 823 } 824 825 error = zvol_update_volsize(os, volsize); 826 827 #ifndef __NetBSD__ 828 /* 829 * Reinitialize the dump area to the new size. If we 830 * failed to resize the dump area then restore it back to 831 * its original size. 832 */ 833 if (zv && error == 0) { 834 if (zv->zv_flags & ZVOL_DUMPIFIED) { 835 old_volsize = zv->zv_volsize; 836 zv->zv_volsize = volsize; 837 if ((error = zvol_dumpify(zv)) != 0 || 838 (error = dumpvp_resize()) != 0) { 839 (void) zvol_update_volsize(os, old_volsize); 840 zv->zv_volsize = old_volsize; 841 error = zvol_dumpify(zv); 842 } 843 } 844 if (error == 0) { 845 zv->zv_volsize = volsize; 846 zvol_size_changed(volsize, maj, zv->zv_minor); 847 } 848 } 849 #endif 850 851 /* 852 * Generate a LUN expansion event. 853 */ 854 if (zv && error == 0) { 855 sysevent_id_t eid; 856 nvlist_t *attr; 857 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 858 859 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 860 zv->zv_minor); 861 862 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 863 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 864 865 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 866 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 867 868 nvlist_free(attr); 869 kmem_free(physpath, MAXPATHLEN); 870 } 871 872 out: 873 dmu_objset_rele(os, FTAG); 874 875 mutex_exit(&zvol_state_lock); 876 877 return (error); 878 } 879 880 /*ARGSUSED*/ 881 int 882 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 883 { 884 minor_t minor = getminor(*devp); 885 zvol_state_t *zv; 886 int err = 0; 887 888 if (minor == 0) /* This is the control device */ 889 return (0); 890 891 mutex_enter(&zvol_state_lock); 892 893 zv = ddi_get_soft_state(zvol_state, minor); 894 if (zv == NULL) { 895 mutex_exit(&zvol_state_lock); 896 return (ENXIO); 897 } 898 899 if (zv->zv_total_opens == 0) 900 err = zvol_first_open(zv); 901 if (err) { 902 mutex_exit(&zvol_state_lock); 903 return (err); 904 } 905 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 906 err = EROFS; 907 goto out; 908 } 909 if (zv->zv_flags & ZVOL_EXCL) { 910 err = EBUSY; 911 goto out; 912 } 913 if (flag & FEXCL) { 914 if (zv->zv_total_opens != 0) { 915 err = EBUSY; 916 goto out; 917 } 918 zv->zv_flags |= ZVOL_EXCL; 919 } 920 921 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 922 zv->zv_open_count[otyp]++; 923 zv->zv_total_opens++; 924 } 925 mutex_exit(&zvol_state_lock); 926 927 return (err); 928 out: 929 if (zv->zv_total_opens == 0) 930 zvol_last_close(zv); 931 mutex_exit(&zvol_state_lock); 932 return (err); 933 } 934 935 /*ARGSUSED*/ 936 int 937 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 938 { 939 minor_t minor = getminor(dev); 940 zvol_state_t *zv; 941 int error = 0; 942 943 if (minor == 0) /* This is the control device */ 944 return (0); 945 946 mutex_enter(&zvol_state_lock); 947 948 zv = ddi_get_soft_state(zvol_state, minor); 949 if (zv == NULL) { 950 mutex_exit(&zvol_state_lock); 951 return (ENXIO); 952 } 953 954 if (zv->zv_flags & ZVOL_EXCL) { 955 ASSERT(zv->zv_total_opens == 1); 956 zv->zv_flags &= ~ZVOL_EXCL; 957 } 958 959 /* 960 * If the open count is zero, this is a spurious close. 961 * That indicates a bug in the kernel / DDI framework. 962 */ 963 ASSERT(zv->zv_open_count[otyp] != 0); 964 ASSERT(zv->zv_total_opens != 0); 965 966 /* 967 * You may get multiple opens, but only one close. 968 */ 969 zv->zv_open_count[otyp]--; 970 zv->zv_total_opens--; 971 972 if (zv->zv_total_opens == 0) 973 zvol_last_close(zv); 974 975 mutex_exit(&zvol_state_lock); 976 return (error); 977 } 978 979 static void 980 zvol_get_done(zgd_t *zgd, int error) 981 { 982 if (zgd->zgd_db) 983 dmu_buf_rele(zgd->zgd_db, zgd); 984 985 zfs_range_unlock(zgd->zgd_rl); 986 987 if (error == 0 && zgd->zgd_bp) 988 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 989 990 kmem_free(zgd, sizeof (zgd_t)); 991 } 992 993 /* 994 * Get data to generate a TX_WRITE intent log record. 995 */ 996 static int 997 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 998 { 999 zvol_state_t *zv = arg; 1000 objset_t *os = zv->zv_objset; 1001 uint64_t object = ZVOL_OBJ; 1002 uint64_t offset = lr->lr_offset; 1003 uint64_t size = lr->lr_length; /* length of user data */ 1004 blkptr_t *bp = &lr->lr_blkptr; 1005 dmu_buf_t *db; 1006 zgd_t *zgd; 1007 int error; 1008 1009 ASSERT(zio != NULL); 1010 ASSERT(size != 0); 1011 1012 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1013 zgd->zgd_zilog = zv->zv_zilog; 1014 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); 1015 1016 /* 1017 * Write records come in two flavors: immediate and indirect. 1018 * For small writes it's cheaper to store the data with the 1019 * log record (immediate); for large writes it's cheaper to 1020 * sync the data and get a pointer to it (indirect) so that 1021 * we don't have to write the data twice. 1022 */ 1023 if (buf != NULL) { /* immediate write */ 1024 error = dmu_read(os, object, offset, size, buf, 1025 DMU_READ_NO_PREFETCH); 1026 } else { 1027 size = zv->zv_volblocksize; 1028 offset = P2ALIGN(offset, size); 1029 error = dmu_buf_hold(os, object, offset, zgd, &db); 1030 if (error == 0) { 1031 zgd->zgd_db = db; 1032 zgd->zgd_bp = bp; 1033 1034 ASSERT(db->db_offset == offset); 1035 ASSERT(db->db_size == size); 1036 1037 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1038 zvol_get_done, zgd); 1039 1040 if (error == 0) 1041 return (0); 1042 } 1043 } 1044 1045 zvol_get_done(zgd, error); 1046 1047 return (error); 1048 } 1049 1050 /* 1051 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 1052 * 1053 * We store data in the log buffers if it's small enough. 1054 * Otherwise we will later flush the data out via dmu_sync(). 1055 */ 1056 ssize_t zvol_immediate_write_sz = 32768; 1057 1058 static void 1059 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1060 boolean_t sync) 1061 { 1062 uint32_t blocksize = zv->zv_volblocksize; 1063 zilog_t *zilog = zv->zv_zilog; 1064 boolean_t slogging; 1065 ssize_t immediate_write_sz; 1066 1067 if (zil_disable) 1068 return; 1069 1070 if (zil_replaying(zilog, tx)) 1071 return; 1072 1073 immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1074 ? 0 : zvol_immediate_write_sz; 1075 1076 slogging = spa_has_slogs(zilog->zl_spa) && 1077 (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); 1078 1079 while (resid) { 1080 itx_t *itx; 1081 lr_write_t *lr; 1082 ssize_t len; 1083 itx_wr_state_t write_state; 1084 1085 /* 1086 * Unlike zfs_log_write() we can be called with 1087 * upto DMU_MAX_ACCESS/2 (5MB) writes. 1088 */ 1089 if (blocksize > immediate_write_sz && !slogging && 1090 resid >= blocksize && off % blocksize == 0) { 1091 write_state = WR_INDIRECT; /* uses dmu_sync */ 1092 len = blocksize; 1093 } else if (sync) { 1094 write_state = WR_COPIED; 1095 len = MIN(ZIL_MAX_LOG_DATA, resid); 1096 } else { 1097 write_state = WR_NEED_COPY; 1098 len = MIN(ZIL_MAX_LOG_DATA, resid); 1099 } 1100 1101 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1102 (write_state == WR_COPIED ? len : 0)); 1103 lr = (lr_write_t *)&itx->itx_lr; 1104 if (write_state == WR_COPIED && dmu_read(zv->zv_objset, 1105 ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1106 zil_itx_destroy(itx); 1107 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1108 lr = (lr_write_t *)&itx->itx_lr; 1109 write_state = WR_NEED_COPY; 1110 } 1111 1112 itx->itx_wr_state = write_state; 1113 if (write_state == WR_NEED_COPY) 1114 itx->itx_sod += len; 1115 lr->lr_foid = ZVOL_OBJ; 1116 lr->lr_offset = off; 1117 lr->lr_length = len; 1118 lr->lr_blkoff = 0; 1119 BP_ZERO(&lr->lr_blkptr); 1120 1121 itx->itx_private = zv; 1122 itx->itx_sync = sync; 1123 1124 (void) zil_itx_assign(zilog, itx, tx); 1125 1126 off += len; 1127 resid -= len; 1128 } 1129 } 1130 1131 #ifndef __NetBSD__ 1132 static int 1133 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 1134 boolean_t doread, boolean_t isdump) 1135 { 1136 vdev_disk_t *dvd; 1137 int c; 1138 int numerrors = 0; 1139 1140 for (c = 0; c < vd->vdev_children; c++) { 1141 ASSERT(vd->vdev_ops == &vdev_mirror_ops || 1142 vd->vdev_ops == &vdev_replacing_ops || 1143 vd->vdev_ops == &vdev_spare_ops); 1144 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1145 addr, offset, size, doread, isdump); 1146 if (err != 0) { 1147 numerrors++; 1148 } else if (doread) { 1149 break; 1150 } 1151 } 1152 1153 if (!vd->vdev_ops->vdev_op_leaf) 1154 return (numerrors < vd->vdev_children ? 0 : EIO); 1155 1156 if (doread && !vdev_readable(vd)) 1157 return (EIO); 1158 else if (!doread && !vdev_writeable(vd)) 1159 return (EIO); 1160 1161 dvd = vd->vdev_tsd; 1162 ASSERT3P(dvd, !=, NULL); 1163 offset += VDEV_LABEL_START_SIZE; 1164 1165 if (ddi_in_panic() || isdump) { 1166 ASSERT(!doread); 1167 if (doread) 1168 return (EIO); 1169 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1170 lbtodb(size))); 1171 } else { 1172 return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 1173 doread ? B_READ : B_WRITE)); 1174 } 1175 } 1176 1177 static int 1178 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1179 boolean_t doread, boolean_t isdump) 1180 { 1181 vdev_t *vd; 1182 int error; 1183 zvol_extent_t *ze; 1184 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1185 1186 /* Must be sector aligned, and not stradle a block boundary. */ 1187 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1188 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1189 return (EINVAL); 1190 } 1191 ASSERT(size <= zv->zv_volblocksize); 1192 1193 /* Locate the extent this belongs to */ 1194 ze = list_head(&zv->zv_extents); 1195 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1196 offset -= ze->ze_nblks * zv->zv_volblocksize; 1197 ze = list_next(&zv->zv_extents, ze); 1198 } 1199 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1200 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1201 offset += DVA_GET_OFFSET(&ze->ze_dva); 1202 error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 1203 spa_config_exit(spa, SCL_STATE, FTAG); 1204 return (error); 1205 } 1206 #endif /* __NetBSD__ */ 1207 1208 void 1209 zvol_strategy(buf_t *bp) 1210 { 1211 zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 1212 uint64_t off, volsize; 1213 size_t resid; 1214 char *addr; 1215 objset_t *os; 1216 rl_t *rl; 1217 int error = 0; 1218 boolean_t doread = bp->b_flags & B_READ; 1219 boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 1220 boolean_t sync; 1221 1222 if (zv == NULL) { 1223 bioerror(bp, ENXIO); 1224 biodone(bp); 1225 return; 1226 } 1227 1228 if (getminor(bp->b_edev) == 0) { 1229 bioerror(bp, EINVAL); 1230 biodone(bp); 1231 return; 1232 } 1233 1234 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1235 bioerror(bp, EROFS); 1236 biodone(bp); 1237 return; 1238 } 1239 1240 off = (uint64_t)bp->b_blkno * DEV_BSIZE; 1241 volsize = zv->zv_volsize; 1242 1243 os = zv->zv_objset; 1244 ASSERT(os != NULL); 1245 1246 addr = bp->b_data; 1247 resid = bp->b_bcount; 1248 1249 if (resid > 0 && off >= volsize) { 1250 bioerror(bp, EIO); 1251 biodone(bp); 1252 return; 1253 } 1254 1255 sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump && 1256 !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1257 1258 /* 1259 * There must be no buffer changes when doing a dmu_sync() because 1260 * we can't change the data whilst calculating the checksum. 1261 */ 1262 mutex_enter(&zv->zv_dklock); 1263 disk_busy(&zv->zv_dk); 1264 mutex_exit(&zv->zv_dklock); 1265 1266 rl = zfs_range_lock(&zv->zv_znode, off, resid, 1267 doread ? RL_READER : RL_WRITER); 1268 1269 while (resid != 0 && off < volsize) { 1270 size_t size = MIN(resid, zvol_maxphys); 1271 if (is_dump) { 1272 #ifdef __NetBSD__ 1273 printf("XXXNETBSD zvol_strategy: how?"); 1274 #else 1275 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1276 error = zvol_dumpio(zv, addr, off, size, 1277 doread, B_FALSE); 1278 #endif 1279 } else if (doread) { 1280 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1281 DMU_READ_PREFETCH); 1282 } else { 1283 dmu_tx_t *tx = dmu_tx_create(os); 1284 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1285 error = dmu_tx_assign(tx, TXG_WAIT); 1286 if (error) { 1287 dmu_tx_abort(tx); 1288 } else { 1289 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1290 zvol_log_write(zv, tx, off, size, sync); 1291 dmu_tx_commit(tx); 1292 } 1293 } 1294 if (error) { 1295 /* convert checksum errors into IO errors */ 1296 if (error == ECKSUM) 1297 error = EIO; 1298 break; 1299 } 1300 off += size; 1301 addr += size; 1302 resid -= size; 1303 } 1304 zfs_range_unlock(rl); 1305 1306 if ((bp->b_resid = resid) == bp->b_bcount) 1307 bioerror(bp, off > volsize ? EINVAL : error); 1308 1309 if (sync) 1310 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1311 mutex_enter(&zv->zv_dklock); 1312 disk_unbusy(&zv->zv_dk, bp->b_bcount - bp->b_resid, doread); 1313 mutex_exit(&zv->zv_dklock); 1314 biodone(bp); 1315 1316 return; 1317 } 1318 1319 /* 1320 * Set the buffer count to the zvol maximum transfer. 1321 * Using our own routine instead of the default minphys() 1322 * means that for larger writes we write bigger buffers on X86 1323 * (128K instead of 56K) and flush the disk write cache less often 1324 * (every zvol_maxphys - currently 1MB) instead of minphys (currently 1325 * 56K on X86 and 128K on sparc). 1326 */ 1327 void 1328 zvol_minphys(struct buf *bp) 1329 { 1330 if (bp->b_bcount > zvol_maxphys) 1331 bp->b_bcount = zvol_maxphys; 1332 } 1333 1334 #ifndef __NetBSD__ 1335 int 1336 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1337 { 1338 minor_t minor = getminor(dev); 1339 zvol_state_t *zv; 1340 int error = 0; 1341 uint64_t size; 1342 uint64_t boff; 1343 uint64_t resid; 1344 1345 if (minor == 0) /* This is the control device */ 1346 return (ENXIO); 1347 1348 zv = ddi_get_soft_state(zvol_state, minor); 1349 if (zv == NULL) 1350 return (ENXIO); 1351 1352 boff = ldbtob(blkno); 1353 resid = ldbtob(nblocks); 1354 1355 VERIFY3U(boff + resid, <=, zv->zv_volsize); 1356 1357 while (resid) { 1358 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 1359 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1360 if (error) 1361 break; 1362 boff += size; 1363 addr += size; 1364 resid -= size; 1365 } 1366 1367 return (error); 1368 } 1369 #endif /* !__NetBSD__ */ 1370 1371 /*ARGSUSED*/ 1372 int 1373 zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1374 { 1375 minor_t minor = getminor(dev); 1376 zvol_state_t *zv; 1377 uint64_t volsize; 1378 rl_t *rl; 1379 int error = 0; 1380 1381 if (minor == 0) /* This is the control device */ 1382 return (ENXIO); 1383 1384 zv = ddi_get_soft_state(zvol_state, minor); 1385 if (zv == NULL) 1386 return (ENXIO); 1387 1388 volsize = zv->zv_volsize; 1389 if (uio->uio_resid > 0 && 1390 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1391 return (EIO); 1392 1393 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1394 error = physio(zvol_strategy, NULL, dev, B_READ, 1395 zvol_minphys, uio); 1396 return (error); 1397 } 1398 1399 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1400 RL_READER); 1401 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1402 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1403 1404 /* don't read past the end */ 1405 if (bytes > volsize - uio->uio_loffset) 1406 bytes = volsize - uio->uio_loffset; 1407 1408 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1409 if (error) { 1410 /* convert checksum errors into IO errors */ 1411 if (error == ECKSUM) 1412 error = EIO; 1413 break; 1414 } 1415 } 1416 zfs_range_unlock(rl); 1417 return (error); 1418 } 1419 1420 /*ARGSUSED*/ 1421 int 1422 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1423 { 1424 minor_t minor = getminor(dev); 1425 zvol_state_t *zv; 1426 uint64_t volsize; 1427 rl_t *rl; 1428 int error = 0; 1429 boolean_t sync; 1430 1431 if (minor == 0) /* This is the control device */ 1432 return (ENXIO); 1433 1434 zv = ddi_get_soft_state(zvol_state, minor); 1435 if (zv == NULL) 1436 return (ENXIO); 1437 1438 volsize = zv->zv_volsize; 1439 if (uio->uio_resid > 0 && 1440 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1441 return (EIO); 1442 1443 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1444 error = physio(zvol_strategy, NULL, dev, B_WRITE, 1445 zvol_minphys, uio); 1446 return (error); 1447 } 1448 1449 sync = !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1450 1451 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1452 RL_WRITER); 1453 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1454 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1455 uint64_t off = uio->uio_loffset; 1456 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1457 1458 if (bytes > volsize - off) /* don't write past the end */ 1459 bytes = volsize - off; 1460 1461 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1462 error = dmu_tx_assign(tx, TXG_WAIT); 1463 if (error) { 1464 dmu_tx_abort(tx); 1465 break; 1466 } 1467 error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); 1468 if (error == 0) 1469 zvol_log_write(zv, tx, off, bytes, sync); 1470 dmu_tx_commit(tx); 1471 1472 if (error) 1473 break; 1474 } 1475 zfs_range_unlock(rl); 1476 if (sync) 1477 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1478 return (error); 1479 } 1480 1481 #ifdef __NetBSD__ 1482 1483 /* 1484 * Dirtbag ioctls to support newfs(1) for UFS filesystems. 1485 */ 1486 /*ARGSUSED*/ 1487 int 1488 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1489 { 1490 zvol_state_t *zv; 1491 int error = 0; 1492 1493 mutex_enter(&zvol_state_lock); 1494 1495 zv = ddi_get_soft_state(zvol_state, getminor(dev)); 1496 1497 if (zv == NULL) { 1498 mutex_exit(&zvol_state_lock); 1499 return (ENXIO); 1500 } 1501 1502 switch(cmd) { 1503 case DIOCGWEDGEINFO: 1504 { 1505 struct dkwedge_info *dkw = (void *) arg; 1506 1507 strlcpy(dkw->dkw_devname, zv->zv_name, 16); 1508 strlcpy(dkw->dkw_wname, zv->zv_name, MAXPATHLEN); 1509 strlcpy(dkw->dkw_parent, zv->zv_name, 16); 1510 1511 dkw->dkw_offset = 0; 1512 /* XXX NetBSD supports only DEV_BSIZE device block 1513 size zv_volblocksize >> DEV_BSIZE*/ 1514 dkw->dkw_size = (zv->zv_volsize / DEV_BSIZE); 1515 dprintf("dkw %"PRIu64" volsize %"PRIu64" volblock %"PRIu64" \n", 1516 dkw->dkw_size, zv->zv_volsize, zv->zv_volblocksize); 1517 strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS); 1518 1519 break; 1520 } 1521 1522 case DIOCGDISKINFO: 1523 { 1524 struct plistref *pref = (struct plistref *) arg; 1525 1526 if (zv->zv_dk.dk_info == NULL) { 1527 mutex_exit(&zvol_state_lock); 1528 return ENOTSUP; 1529 } else 1530 prop_dictionary_copyout_ioctl(pref, cmd, 1531 zv->zv_dk.dk_info); 1532 1533 break; 1534 } 1535 1536 default: 1537 aprint_debug("unknown disk_ioctl called\n"); 1538 error = ENOTTY; 1539 break; 1540 } 1541 1542 mutex_exit(&zvol_state_lock); 1543 return (error); 1544 } 1545 1546 #else /* __NetBSD__ */ 1547 1548 int 1549 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1550 { 1551 struct uuid uuid = EFI_RESERVED; 1552 efi_gpe_t gpe = { 0 }; 1553 uint32_t crc; 1554 dk_efi_t efi; 1555 int length; 1556 char *ptr; 1557 1558 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1559 return (EFAULT); 1560 ptr = (char *)(uintptr_t)efi.dki_data_64; 1561 length = efi.dki_length; 1562 /* 1563 * Some clients may attempt to request a PMBR for the 1564 * zvol. Currently this interface will return EINVAL to 1565 * such requests. These requests could be supported by 1566 * adding a check for lba == 0 and consing up an appropriate 1567 * PMBR. 1568 */ 1569 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1570 return (EINVAL); 1571 1572 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1573 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1574 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1575 1576 if (efi.dki_lba == 1) { 1577 efi_gpt_t gpt = { 0 }; 1578 1579 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1580 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1581 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1582 gpt.efi_gpt_MyLBA = LE_64(1ULL); 1583 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1584 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1585 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1586 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1587 gpt.efi_gpt_SizeOfPartitionEntry = 1588 LE_32(sizeof (efi_gpe_t)); 1589 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1590 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1591 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1592 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1593 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1594 flag)) 1595 return (EFAULT); 1596 ptr += sizeof (gpt); 1597 length -= sizeof (gpt); 1598 } 1599 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1600 length), flag)) 1601 return (EFAULT); 1602 return (0); 1603 } 1604 1605 /* 1606 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1607 */ 1608 /*ARGSUSED*/ 1609 int 1610 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1611 { 1612 zvol_state_t *zv; 1613 struct dk_cinfo dki; 1614 struct dk_minfo dkm; 1615 struct dk_callback *dkc; 1616 int error = 0; 1617 rl_t *rl; 1618 1619 mutex_enter(&zvol_state_lock); 1620 1621 zv = ddi_get_soft_state(zvol_state, getminor(dev)); 1622 1623 if (zv == NULL) { 1624 mutex_exit(&zvol_state_lock); 1625 return (ENXIO); 1626 } 1627 ASSERT(zv->zv_total_opens > 0); 1628 1629 switch (cmd) { 1630 1631 case DKIOCINFO: 1632 bzero(&dki, sizeof (dki)); 1633 (void) strcpy(dki.dki_cname, "zvol"); 1634 (void) strcpy(dki.dki_dname, "zvol"); 1635 dki.dki_ctype = DKC_UNKNOWN; 1636 dki.dki_unit = getminor(dev); 1637 dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1638 mutex_exit(&zvol_state_lock); 1639 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1640 error = EFAULT; 1641 return (error); 1642 1643 case DKIOCGMEDIAINFO: 1644 bzero(&dkm, sizeof (dkm)); 1645 dkm.dki_lbsize = 1U << zv->zv_min_bs; 1646 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1647 dkm.dki_media_type = DK_UNKNOWN; 1648 mutex_exit(&zvol_state_lock); 1649 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1650 error = EFAULT; 1651 return (error); 1652 1653 case DKIOCGETEFI: 1654 { 1655 uint64_t vs = zv->zv_volsize; 1656 uint8_t bs = zv->zv_min_bs; 1657 1658 mutex_exit(&zvol_state_lock); 1659 error = zvol_getefi((void *)arg, flag, vs, bs); 1660 return (error); 1661 } 1662 1663 case DKIOCFLUSHWRITECACHE: 1664 dkc = (struct dk_callback *)arg; 1665 mutex_exit(&zvol_state_lock); 1666 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1667 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1668 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1669 error = 0; 1670 } 1671 return (error); 1672 1673 case DKIOCGETWCE: 1674 { 1675 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1676 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1677 flag)) 1678 error = EFAULT; 1679 break; 1680 } 1681 case DKIOCSETWCE: 1682 { 1683 int wce; 1684 if (ddi_copyin((void *)arg, &wce, sizeof (int), 1685 flag)) { 1686 error = EFAULT; 1687 break; 1688 } 1689 if (wce) { 1690 zv->zv_flags |= ZVOL_WCE; 1691 mutex_exit(&zvol_state_lock); 1692 } else { 1693 zv->zv_flags &= ~ZVOL_WCE; 1694 mutex_exit(&zvol_state_lock); 1695 zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1696 } 1697 return (0); 1698 } 1699 1700 case DKIOCGGEOM: 1701 case DKIOCGVTOC: 1702 /* 1703 * commands using these (like prtvtoc) expect ENOTSUP 1704 * since we're emulating an EFI label 1705 */ 1706 error = ENOTSUP; 1707 break; 1708 1709 case DKIOCDUMPINIT: 1710 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1711 RL_WRITER); 1712 error = zvol_dumpify(zv); 1713 zfs_range_unlock(rl); 1714 break; 1715 1716 case DKIOCDUMPFINI: 1717 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 1718 break; 1719 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1720 RL_WRITER); 1721 error = zvol_dump_fini(zv); 1722 zfs_range_unlock(rl); 1723 break; 1724 1725 default: 1726 error = ENOTTY; 1727 break; 1728 1729 } 1730 mutex_exit(&zvol_state_lock); 1731 return (error); 1732 } 1733 1734 #endif /* __NetBSD__ */ 1735 1736 int 1737 zvol_busy(void) 1738 { 1739 return (zvol_minors != 0); 1740 } 1741 1742 void 1743 zvol_init(void) 1744 { 1745 VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1746 mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1747 } 1748 1749 void 1750 zvol_fini(void) 1751 { 1752 mutex_destroy(&zvol_state_lock); 1753 ddi_soft_state_fini(&zvol_state); 1754 } 1755 1756 #ifndef __NetBSD__ 1757 static int 1758 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1759 { 1760 dmu_tx_t *tx; 1761 int error = 0; 1762 objset_t *os = zv->zv_objset; 1763 nvlist_t *nv = NULL; 1764 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1765 1766 ASSERT(MUTEX_HELD(&zvol_state_lock)); 1767 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1768 DMU_OBJECT_END); 1769 /* wait for dmu_free_long_range to actually free the blocks */ 1770 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1771 1772 tx = dmu_tx_create(os); 1773 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1774 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1775 error = dmu_tx_assign(tx, TXG_WAIT); 1776 if (error) { 1777 dmu_tx_abort(tx); 1778 return (error); 1779 } 1780 1781 /* 1782 * If we are resizing the dump device then we only need to 1783 * update the refreservation to match the newly updated 1784 * zvolsize. Otherwise, we save off the original state of the 1785 * zvol so that we can restore them if the zvol is ever undumpified. 1786 */ 1787 if (resize) { 1788 error = zap_update(os, ZVOL_ZAP_OBJ, 1789 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1790 &zv->zv_volsize, tx); 1791 } else { 1792 uint64_t checksum, compress, refresrv, vbs, dedup; 1793 1794 error = dsl_prop_get_integer(zv->zv_name, 1795 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1796 error = error ? error : dsl_prop_get_integer(zv->zv_name, 1797 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1798 error = error ? error : dsl_prop_get_integer(zv->zv_name, 1799 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 1800 error = error ? error : dsl_prop_get_integer(zv->zv_name, 1801 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 1802 if (version >= SPA_VERSION_DEDUP) { 1803 error = error ? error : 1804 dsl_prop_get_integer(zv->zv_name, 1805 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 1806 } 1807 1808 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1809 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1810 &compress, tx); 1811 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1812 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1813 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1814 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1815 &refresrv, tx); 1816 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1817 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 1818 &vbs, tx); 1819 error = error ? error : dmu_object_set_blocksize( 1820 os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx); 1821 if (version >= SPA_VERSION_DEDUP) { 1822 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1823 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 1824 &dedup, tx); 1825 } 1826 if (error == 0) 1827 zv->zv_volblocksize = SPA_MAXBLOCKSIZE; 1828 } 1829 dmu_tx_commit(tx); 1830 1831 /* 1832 * We only need update the zvol's property if we are initializing 1833 * the dump area for the first time. 1834 */ 1835 if (!resize) { 1836 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1837 VERIFY(nvlist_add_uint64(nv, 1838 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1839 VERIFY(nvlist_add_uint64(nv, 1840 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1841 ZIO_COMPRESS_OFF) == 0); 1842 VERIFY(nvlist_add_uint64(nv, 1843 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1844 ZIO_CHECKSUM_OFF) == 0); 1845 if (version >= SPA_VERSION_DEDUP) { 1846 VERIFY(nvlist_add_uint64(nv, 1847 zfs_prop_to_name(ZFS_PROP_DEDUP), 1848 ZIO_CHECKSUM_OFF) == 0); 1849 } 1850 1851 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 1852 nv, NULL); 1853 nvlist_free(nv); 1854 1855 if (error) 1856 return (error); 1857 } 1858 1859 /* Allocate the space for the dump */ 1860 error = zvol_prealloc(zv); 1861 return (error); 1862 } 1863 1864 static int 1865 zvol_dumpify(zvol_state_t *zv) 1866 { 1867 int error = 0; 1868 uint64_t dumpsize = 0; 1869 dmu_tx_t *tx; 1870 objset_t *os = zv->zv_objset; 1871 1872 if (zv->zv_flags & ZVOL_RDONLY) 1873 return (EROFS); 1874 1875 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1876 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 1877 boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; 1878 1879 if ((error = zvol_dump_init(zv, resize)) != 0) { 1880 (void) zvol_dump_fini(zv); 1881 return (error); 1882 } 1883 } 1884 1885 /* 1886 * Build up our lba mapping. 1887 */ 1888 error = zvol_get_lbas(zv); 1889 if (error) { 1890 (void) zvol_dump_fini(zv); 1891 return (error); 1892 } 1893 1894 tx = dmu_tx_create(os); 1895 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1896 error = dmu_tx_assign(tx, TXG_WAIT); 1897 if (error) { 1898 dmu_tx_abort(tx); 1899 (void) zvol_dump_fini(zv); 1900 return (error); 1901 } 1902 1903 zv->zv_flags |= ZVOL_DUMPIFIED; 1904 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1905 &zv->zv_volsize, tx); 1906 dmu_tx_commit(tx); 1907 1908 if (error) { 1909 (void) zvol_dump_fini(zv); 1910 return (error); 1911 } 1912 1913 txg_wait_synced(dmu_objset_pool(os), 0); 1914 return (0); 1915 } 1916 1917 static int 1918 zvol_dump_fini(zvol_state_t *zv) 1919 { 1920 dmu_tx_t *tx; 1921 objset_t *os = zv->zv_objset; 1922 nvlist_t *nv; 1923 int error = 0; 1924 uint64_t checksum, compress, refresrv, vbs, dedup; 1925 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1926 1927 /* 1928 * Attempt to restore the zvol back to its pre-dumpified state. 1929 * This is a best-effort attempt as it's possible that not all 1930 * of these properties were initialized during the dumpify process 1931 * (i.e. error during zvol_dump_init). 1932 */ 1933 1934 tx = dmu_tx_create(os); 1935 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1936 error = dmu_tx_assign(tx, TXG_WAIT); 1937 if (error) { 1938 dmu_tx_abort(tx); 1939 return (error); 1940 } 1941 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1942 dmu_tx_commit(tx); 1943 1944 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1945 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1946 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1947 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1948 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1949 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 1950 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1951 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1952 1953 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1954 (void) nvlist_add_uint64(nv, 1955 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1956 (void) nvlist_add_uint64(nv, 1957 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1958 (void) nvlist_add_uint64(nv, 1959 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 1960 if (version >= SPA_VERSION_DEDUP && 1961 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1962 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 1963 (void) nvlist_add_uint64(nv, 1964 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 1965 } 1966 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 1967 nv, NULL); 1968 nvlist_free(nv); 1969 1970 zvol_free_extents(zv); 1971 zv->zv_flags &= ~ZVOL_DUMPIFIED; 1972 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 1973 /* wait for dmu_free_long_range to actually free the blocks */ 1974 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1975 tx = dmu_tx_create(os); 1976 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1977 error = dmu_tx_assign(tx, TXG_WAIT); 1978 if (error) { 1979 dmu_tx_abort(tx); 1980 return (error); 1981 } 1982 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 1983 zv->zv_volblocksize = vbs; 1984 dmu_tx_commit(tx); 1985 1986 return (0); 1987 } 1988 #endif /* !__NetBSD__ */ 1989