1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * 24 * Portions Copyright 2010 Robert Milkowski 25 * 26 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 27 */ 28 29 /* 30 * ZFS volume emulation driver. 31 * 32 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 33 * Volumes are accessed through the symbolic links named: 34 * 35 * /dev/zvol/dsk/<pool_name>/<dataset_name> 36 * /dev/zvol/rdsk/<pool_name>/<dataset_name> 37 * 38 * These links are created by the /dev filesystem (sdev_zvolops.c). 39 * Volumes are persistent through reboot. No user command needs to be 40 * run before opening and using a device. 41 */ 42 43 #include <sys/types.h> 44 #include <sys/param.h> 45 #include <sys/errno.h> 46 #include <sys/uio.h> 47 #include <sys/buf.h> 48 #include <sys/modctl.h> 49 #include <sys/open.h> 50 #include <sys/kmem.h> 51 #include <sys/conf.h> 52 #include <sys/cmn_err.h> 53 #include <sys/stat.h> 54 #include <sys/zap.h> 55 #include <sys/spa.h> 56 #include <sys/zio.h> 57 #include <sys/dmu_traverse.h> 58 #include <sys/dnode.h> 59 #include <sys/dsl_dataset.h> 60 #include <sys/dsl_prop.h> 61 #include <sys/dkio.h> 62 #include <sys/efi_partition.h> 63 #include <sys/byteorder.h> 64 #include <sys/pathname.h> 65 #include <sys/ddi.h> 66 #include <sys/sunddi.h> 67 #include <sys/crc32.h> 68 #include <sys/dirent.h> 69 #include <sys/policy.h> 70 #include <sys/fs/zfs.h> 71 #include <sys/zfs_ioctl.h> 72 #include <sys/mkdev.h> 73 #include <sys/zil.h> 74 #include <sys/refcount.h> 75 #include <sys/zfs_znode.h> 76 #include <sys/zfs_rlock.h> 77 #include <sys/vdev_disk.h> 78 #include <sys/vdev_impl.h> 79 #include <sys/zvol.h> 80 #include <sys/dumphdr.h> 81 #include <sys/zil_impl.h> 82 83 #include "zfs_namecheck.h" 84 85 void *zfsdev_state; 86 static char *zvol_tag = "zvol_tag"; 87 88 #define ZVOL_DUMPSIZE "dumpsize" 89 90 /* 91 * This lock protects the zfsdev_state structure from being modified 92 * while it's being used, e.g. an open that comes in before a create 93 * finishes. It also protects temporary opens of the dataset so that, 94 * e.g., an open doesn't get a spurious EBUSY. 95 */ 96 kmutex_t zfsdev_state_lock; 97 static uint32_t zvol_minors; 98 99 typedef struct zvol_extent { 100 list_node_t ze_node; 101 dva_t ze_dva; /* dva associated with this extent */ 102 uint64_t ze_nblks; /* number of blocks in extent */ 103 } zvol_extent_t; 104 105 /* 106 * The in-core state of each volume. 107 */ 108 typedef struct zvol_state { 109 char zv_name[MAXPATHLEN]; /* pool/dd name */ 110 uint64_t zv_volsize; /* amount of space we advertise */ 111 uint64_t zv_volblocksize; /* volume block size */ 112 minor_t zv_minor; /* minor number */ 113 uint8_t zv_min_bs; /* minimum addressable block shift */ 114 uint8_t zv_flags; /* readonly, dumpified, etc. */ 115 objset_t *zv_objset; /* objset handle */ 116 uint32_t zv_open_count[OTYPCNT]; /* open counts */ 117 uint32_t zv_total_opens; /* total open count */ 118 zilog_t *zv_zilog; /* ZIL handle */ 119 list_t zv_extents; /* List of extents for dump */ 120 znode_t zv_znode; /* for range locking */ 121 dmu_buf_t *zv_dbuf; /* bonus handle */ 122 } zvol_state_t; 123 124 /* 125 * zvol specific flags 126 */ 127 #define ZVOL_RDONLY 0x1 128 #define ZVOL_DUMPIFIED 0x2 129 #define ZVOL_EXCL 0x4 130 #define ZVOL_WCE 0x8 131 132 /* 133 * zvol maximum transfer in one DMU tx. 134 */ 135 int zvol_maxphys = DMU_MAX_ACCESS/2; 136 137 extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 138 nvlist_t *, nvlist_t **); 139 static int zvol_remove_zv(zvol_state_t *); 140 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 141 static int zvol_dumpify(zvol_state_t *zv); 142 static int zvol_dump_fini(zvol_state_t *zv); 143 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 144 145 static void 146 zvol_size_changed(uint64_t volsize, major_t maj, minor_t min) 147 { 148 dev_t dev = makedevice(maj, min); 149 150 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 151 "Size", volsize) == DDI_SUCCESS); 152 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 153 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 154 155 /* Notify specfs to invalidate the cached size */ 156 spec_size_invalidate(dev, VBLK); 157 spec_size_invalidate(dev, VCHR); 158 } 159 160 int 161 zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 162 { 163 if (volsize == 0) 164 return (EINVAL); 165 166 if (volsize % blocksize != 0) 167 return (EINVAL); 168 169 #ifdef _ILP32 170 if (volsize - 1 > SPEC_MAXOFFSET_T) 171 return (EOVERFLOW); 172 #endif 173 return (0); 174 } 175 176 int 177 zvol_check_volblocksize(uint64_t volblocksize) 178 { 179 if (volblocksize < SPA_MINBLOCKSIZE || 180 volblocksize > SPA_MAXBLOCKSIZE || 181 !ISP2(volblocksize)) 182 return (EDOM); 183 184 return (0); 185 } 186 187 int 188 zvol_get_stats(objset_t *os, nvlist_t *nv) 189 { 190 int error; 191 dmu_object_info_t doi; 192 uint64_t val; 193 194 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 195 if (error) 196 return (error); 197 198 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 199 200 error = dmu_object_info(os, ZVOL_OBJ, &doi); 201 202 if (error == 0) { 203 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 204 doi.doi_data_block_size); 205 } 206 207 return (error); 208 } 209 210 static zvol_state_t * 211 zvol_minor_lookup(const char *name) 212 { 213 minor_t minor; 214 zvol_state_t *zv; 215 216 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 217 218 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 219 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 220 if (zv == NULL) 221 continue; 222 if (strcmp(zv->zv_name, name) == 0) 223 return (zv); 224 } 225 226 return (NULL); 227 } 228 229 /* extent mapping arg */ 230 struct maparg { 231 zvol_state_t *ma_zv; 232 uint64_t ma_blks; 233 }; 234 235 /*ARGSUSED*/ 236 static int 237 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf, 238 const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) 239 { 240 struct maparg *ma = arg; 241 zvol_extent_t *ze; 242 int bs = ma->ma_zv->zv_volblocksize; 243 244 if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 245 return (0); 246 247 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 248 ma->ma_blks++; 249 250 /* Abort immediately if we have encountered gang blocks */ 251 if (BP_IS_GANG(bp)) 252 return (EFRAGS); 253 254 /* 255 * See if the block is at the end of the previous extent. 256 */ 257 ze = list_tail(&ma->ma_zv->zv_extents); 258 if (ze && 259 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 260 DVA_GET_OFFSET(BP_IDENTITY(bp)) == 261 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 262 ze->ze_nblks++; 263 return (0); 264 } 265 266 dprintf_bp(bp, "%s", "next blkptr:"); 267 268 /* start a new extent */ 269 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 270 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 271 ze->ze_nblks = 1; 272 list_insert_tail(&ma->ma_zv->zv_extents, ze); 273 return (0); 274 } 275 276 static void 277 zvol_free_extents(zvol_state_t *zv) 278 { 279 zvol_extent_t *ze; 280 281 while (ze = list_head(&zv->zv_extents)) { 282 list_remove(&zv->zv_extents, ze); 283 kmem_free(ze, sizeof (zvol_extent_t)); 284 } 285 } 286 287 static int 288 zvol_get_lbas(zvol_state_t *zv) 289 { 290 objset_t *os = zv->zv_objset; 291 struct maparg ma; 292 int err; 293 294 ma.ma_zv = zv; 295 ma.ma_blks = 0; 296 zvol_free_extents(zv); 297 298 /* commit any in-flight changes before traversing the dataset */ 299 txg_wait_synced(dmu_objset_pool(os), 0); 300 err = traverse_dataset(dmu_objset_ds(os), 0, 301 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 302 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 303 zvol_free_extents(zv); 304 return (err ? err : EIO); 305 } 306 307 return (0); 308 } 309 310 /* ARGSUSED */ 311 void 312 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 313 { 314 zfs_creat_t *zct = arg; 315 nvlist_t *nvprops = zct->zct_props; 316 int error; 317 uint64_t volblocksize, volsize; 318 319 VERIFY(nvlist_lookup_uint64(nvprops, 320 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 321 if (nvlist_lookup_uint64(nvprops, 322 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 323 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 324 325 /* 326 * These properties must be removed from the list so the generic 327 * property setting step won't apply to them. 328 */ 329 VERIFY(nvlist_remove_all(nvprops, 330 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 331 (void) nvlist_remove_all(nvprops, 332 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 333 334 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 335 DMU_OT_NONE, 0, tx); 336 ASSERT(error == 0); 337 338 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 339 DMU_OT_NONE, 0, tx); 340 ASSERT(error == 0); 341 342 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 343 ASSERT(error == 0); 344 } 345 346 /* 347 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 348 * implement DKIOCFREE/free-long-range. 349 */ 350 static int 351 zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap) 352 { 353 uint64_t offset, length; 354 355 if (byteswap) 356 byteswap_uint64_array(lr, sizeof (*lr)); 357 358 offset = lr->lr_offset; 359 length = lr->lr_length; 360 361 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 362 } 363 364 /* 365 * Replay a TX_WRITE ZIL transaction that didn't get committed 366 * after a system failure 367 */ 368 static int 369 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 370 { 371 objset_t *os = zv->zv_objset; 372 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 373 uint64_t offset, length; 374 dmu_tx_t *tx; 375 int error; 376 377 if (byteswap) 378 byteswap_uint64_array(lr, sizeof (*lr)); 379 380 offset = lr->lr_offset; 381 length = lr->lr_length; 382 383 /* If it's a dmu_sync() block, write the whole block */ 384 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 385 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 386 if (length < blocksize) { 387 offset -= offset % blocksize; 388 length = blocksize; 389 } 390 } 391 392 tx = dmu_tx_create(os); 393 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 394 error = dmu_tx_assign(tx, TXG_WAIT); 395 if (error) { 396 dmu_tx_abort(tx); 397 } else { 398 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 399 dmu_tx_commit(tx); 400 } 401 402 return (error); 403 } 404 405 /* ARGSUSED */ 406 static int 407 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 408 { 409 return (ENOTSUP); 410 } 411 412 /* 413 * Callback vectors for replaying records. 414 * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 415 */ 416 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 417 zvol_replay_err, /* 0 no such transaction type */ 418 zvol_replay_err, /* TX_CREATE */ 419 zvol_replay_err, /* TX_MKDIR */ 420 zvol_replay_err, /* TX_MKXATTR */ 421 zvol_replay_err, /* TX_SYMLINK */ 422 zvol_replay_err, /* TX_REMOVE */ 423 zvol_replay_err, /* TX_RMDIR */ 424 zvol_replay_err, /* TX_LINK */ 425 zvol_replay_err, /* TX_RENAME */ 426 zvol_replay_write, /* TX_WRITE */ 427 zvol_replay_truncate, /* TX_TRUNCATE */ 428 zvol_replay_err, /* TX_SETATTR */ 429 zvol_replay_err, /* TX_ACL */ 430 zvol_replay_err, /* TX_CREATE_ACL */ 431 zvol_replay_err, /* TX_CREATE_ATTR */ 432 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 433 zvol_replay_err, /* TX_MKDIR_ACL */ 434 zvol_replay_err, /* TX_MKDIR_ATTR */ 435 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 436 zvol_replay_err, /* TX_WRITE2 */ 437 }; 438 439 int 440 zvol_name2minor(const char *name, minor_t *minor) 441 { 442 zvol_state_t *zv; 443 444 mutex_enter(&zfsdev_state_lock); 445 zv = zvol_minor_lookup(name); 446 if (minor && zv) 447 *minor = zv->zv_minor; 448 mutex_exit(&zfsdev_state_lock); 449 return (zv ? 0 : -1); 450 } 451 452 /* 453 * Create a minor node (plus a whole lot more) for the specified volume. 454 */ 455 int 456 zvol_create_minor(const char *name) 457 { 458 zfs_soft_state_t *zs; 459 zvol_state_t *zv; 460 objset_t *os; 461 dmu_object_info_t doi; 462 minor_t minor = 0; 463 char chrbuf[30], blkbuf[30]; 464 int error; 465 466 mutex_enter(&zfsdev_state_lock); 467 468 if (zvol_minor_lookup(name) != NULL) { 469 mutex_exit(&zfsdev_state_lock); 470 return (EEXIST); 471 } 472 473 /* lie and say we're read-only */ 474 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); 475 476 if (error) { 477 mutex_exit(&zfsdev_state_lock); 478 return (error); 479 } 480 481 if ((minor = zfsdev_minor_alloc()) == 0) { 482 dmu_objset_disown(os, FTAG); 483 mutex_exit(&zfsdev_state_lock); 484 return (ENXIO); 485 } 486 487 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 488 dmu_objset_disown(os, FTAG); 489 mutex_exit(&zfsdev_state_lock); 490 return (EAGAIN); 491 } 492 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 493 (char *)name); 494 495 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 496 497 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 498 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 499 ddi_soft_state_free(zfsdev_state, minor); 500 dmu_objset_disown(os, FTAG); 501 mutex_exit(&zfsdev_state_lock); 502 return (EAGAIN); 503 } 504 505 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 506 507 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 508 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 509 ddi_remove_minor_node(zfs_dip, chrbuf); 510 ddi_soft_state_free(zfsdev_state, minor); 511 dmu_objset_disown(os, FTAG); 512 mutex_exit(&zfsdev_state_lock); 513 return (EAGAIN); 514 } 515 516 zs = ddi_get_soft_state(zfsdev_state, minor); 517 zs->zss_type = ZSST_ZVOL; 518 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 519 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 520 zv->zv_min_bs = DEV_BSHIFT; 521 zv->zv_minor = minor; 522 zv->zv_objset = os; 523 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 524 zv->zv_flags |= ZVOL_RDONLY; 525 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 526 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 527 sizeof (rl_t), offsetof(rl_t, r_node)); 528 list_create(&zv->zv_extents, sizeof (zvol_extent_t), 529 offsetof(zvol_extent_t, ze_node)); 530 /* get and cache the blocksize */ 531 error = dmu_object_info(os, ZVOL_OBJ, &doi); 532 ASSERT(error == 0); 533 zv->zv_volblocksize = doi.doi_data_block_size; 534 535 if (spa_writeable(dmu_objset_spa(os))) { 536 if (zil_replay_disable) 537 zil_destroy(dmu_objset_zil(os), B_FALSE); 538 else 539 zil_replay(os, zv, zvol_replay_vector); 540 } 541 dmu_objset_disown(os, FTAG); 542 zv->zv_objset = NULL; 543 544 zvol_minors++; 545 546 mutex_exit(&zfsdev_state_lock); 547 548 return (0); 549 } 550 551 /* 552 * Remove minor node for the specified volume. 553 */ 554 static int 555 zvol_remove_zv(zvol_state_t *zv) 556 { 557 char nmbuf[20]; 558 minor_t minor = zv->zv_minor; 559 560 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 561 if (zv->zv_total_opens != 0) 562 return (EBUSY); 563 564 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 565 ddi_remove_minor_node(zfs_dip, nmbuf); 566 567 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 568 ddi_remove_minor_node(zfs_dip, nmbuf); 569 570 avl_destroy(&zv->zv_znode.z_range_avl); 571 mutex_destroy(&zv->zv_znode.z_range_lock); 572 573 kmem_free(zv, sizeof (zvol_state_t)); 574 575 ddi_soft_state_free(zfsdev_state, minor); 576 577 zvol_minors--; 578 return (0); 579 } 580 581 int 582 zvol_remove_minor(const char *name) 583 { 584 zvol_state_t *zv; 585 int rc; 586 587 mutex_enter(&zfsdev_state_lock); 588 if ((zv = zvol_minor_lookup(name)) == NULL) { 589 mutex_exit(&zfsdev_state_lock); 590 return (ENXIO); 591 } 592 rc = zvol_remove_zv(zv); 593 mutex_exit(&zfsdev_state_lock); 594 return (rc); 595 } 596 597 int 598 zvol_first_open(zvol_state_t *zv) 599 { 600 objset_t *os; 601 uint64_t volsize; 602 int error; 603 uint64_t readonly; 604 605 /* lie and say we're read-only */ 606 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 607 zvol_tag, &os); 608 if (error) 609 return (error); 610 611 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 612 if (error) { 613 ASSERT(error == 0); 614 dmu_objset_disown(os, zvol_tag); 615 return (error); 616 } 617 zv->zv_objset = os; 618 error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf); 619 if (error) { 620 dmu_objset_disown(os, zvol_tag); 621 return (error); 622 } 623 zv->zv_volsize = volsize; 624 zv->zv_zilog = zil_open(os, zvol_get_data); 625 zvol_size_changed(zv->zv_volsize, ddi_driver_major(zfs_dip), 626 zv->zv_minor); 627 628 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 629 NULL) == 0); 630 if (readonly || dmu_objset_is_snapshot(os) || 631 !spa_writeable(dmu_objset_spa(os))) 632 zv->zv_flags |= ZVOL_RDONLY; 633 else 634 zv->zv_flags &= ~ZVOL_RDONLY; 635 return (error); 636 } 637 638 void 639 zvol_last_close(zvol_state_t *zv) 640 { 641 zil_close(zv->zv_zilog); 642 zv->zv_zilog = NULL; 643 dmu_buf_rele(zv->zv_dbuf, zvol_tag); 644 zv->zv_dbuf = NULL; 645 dmu_objset_disown(zv->zv_objset, zvol_tag); 646 zv->zv_objset = NULL; 647 } 648 649 int 650 zvol_prealloc(zvol_state_t *zv) 651 { 652 objset_t *os = zv->zv_objset; 653 dmu_tx_t *tx; 654 uint64_t refd, avail, usedobjs, availobjs; 655 uint64_t resid = zv->zv_volsize; 656 uint64_t off = 0; 657 658 /* Check the space usage before attempting to allocate the space */ 659 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 660 if (avail < zv->zv_volsize) 661 return (ENOSPC); 662 663 /* Free old extents if they exist */ 664 zvol_free_extents(zv); 665 666 while (resid != 0) { 667 int error; 668 uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); 669 670 tx = dmu_tx_create(os); 671 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 672 error = dmu_tx_assign(tx, TXG_WAIT); 673 if (error) { 674 dmu_tx_abort(tx); 675 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 676 return (error); 677 } 678 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 679 dmu_tx_commit(tx); 680 off += bytes; 681 resid -= bytes; 682 } 683 txg_wait_synced(dmu_objset_pool(os), 0); 684 685 return (0); 686 } 687 688 int 689 zvol_update_volsize(objset_t *os, uint64_t volsize) 690 { 691 dmu_tx_t *tx; 692 int error; 693 694 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 695 696 tx = dmu_tx_create(os); 697 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 698 error = dmu_tx_assign(tx, TXG_WAIT); 699 if (error) { 700 dmu_tx_abort(tx); 701 return (error); 702 } 703 704 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 705 &volsize, tx); 706 dmu_tx_commit(tx); 707 708 if (error == 0) 709 error = dmu_free_long_range(os, 710 ZVOL_OBJ, volsize, DMU_OBJECT_END); 711 return (error); 712 } 713 714 void 715 zvol_remove_minors(const char *name) 716 { 717 zvol_state_t *zv; 718 char *namebuf; 719 minor_t minor; 720 721 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 722 (void) strncpy(namebuf, name, strlen(name)); 723 (void) strcat(namebuf, "/"); 724 mutex_enter(&zfsdev_state_lock); 725 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 726 727 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 728 if (zv == NULL) 729 continue; 730 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 731 (void) zvol_remove_zv(zv); 732 } 733 kmem_free(namebuf, strlen(name) + 2); 734 735 mutex_exit(&zfsdev_state_lock); 736 } 737 738 int 739 zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 740 { 741 zvol_state_t *zv = NULL; 742 objset_t *os; 743 int error; 744 dmu_object_info_t doi; 745 uint64_t old_volsize = 0ULL; 746 uint64_t readonly; 747 748 mutex_enter(&zfsdev_state_lock); 749 zv = zvol_minor_lookup(name); 750 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 751 mutex_exit(&zfsdev_state_lock); 752 return (error); 753 } 754 755 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 756 (error = zvol_check_volsize(volsize, 757 doi.doi_data_block_size)) != 0) 758 goto out; 759 760 VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, 761 NULL) == 0); 762 if (readonly) { 763 error = EROFS; 764 goto out; 765 } 766 767 error = zvol_update_volsize(os, volsize); 768 /* 769 * Reinitialize the dump area to the new size. If we 770 * failed to resize the dump area then restore it back to 771 * its original size. 772 */ 773 if (zv && error == 0) { 774 if (zv->zv_flags & ZVOL_DUMPIFIED) { 775 old_volsize = zv->zv_volsize; 776 zv->zv_volsize = volsize; 777 if ((error = zvol_dumpify(zv)) != 0 || 778 (error = dumpvp_resize()) != 0) { 779 (void) zvol_update_volsize(os, old_volsize); 780 zv->zv_volsize = old_volsize; 781 error = zvol_dumpify(zv); 782 } 783 } 784 if (error == 0) { 785 zv->zv_volsize = volsize; 786 zvol_size_changed(volsize, maj, zv->zv_minor); 787 } 788 } 789 790 /* 791 * Generate a LUN expansion event. 792 */ 793 if (zv && error == 0) { 794 sysevent_id_t eid; 795 nvlist_t *attr; 796 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 797 798 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 799 zv->zv_minor); 800 801 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 802 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 803 804 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 805 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 806 807 nvlist_free(attr); 808 kmem_free(physpath, MAXPATHLEN); 809 } 810 811 out: 812 dmu_objset_rele(os, FTAG); 813 814 mutex_exit(&zfsdev_state_lock); 815 816 return (error); 817 } 818 819 /*ARGSUSED*/ 820 int 821 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 822 { 823 zvol_state_t *zv; 824 int err = 0; 825 826 mutex_enter(&zfsdev_state_lock); 827 828 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 829 if (zv == NULL) { 830 mutex_exit(&zfsdev_state_lock); 831 return (ENXIO); 832 } 833 834 if (zv->zv_total_opens == 0) 835 err = zvol_first_open(zv); 836 if (err) { 837 mutex_exit(&zfsdev_state_lock); 838 return (err); 839 } 840 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 841 err = EROFS; 842 goto out; 843 } 844 if (zv->zv_flags & ZVOL_EXCL) { 845 err = EBUSY; 846 goto out; 847 } 848 if (flag & FEXCL) { 849 if (zv->zv_total_opens != 0) { 850 err = EBUSY; 851 goto out; 852 } 853 zv->zv_flags |= ZVOL_EXCL; 854 } 855 856 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 857 zv->zv_open_count[otyp]++; 858 zv->zv_total_opens++; 859 } 860 mutex_exit(&zfsdev_state_lock); 861 862 return (err); 863 out: 864 if (zv->zv_total_opens == 0) 865 zvol_last_close(zv); 866 mutex_exit(&zfsdev_state_lock); 867 return (err); 868 } 869 870 /*ARGSUSED*/ 871 int 872 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 873 { 874 minor_t minor = getminor(dev); 875 zvol_state_t *zv; 876 int error = 0; 877 878 mutex_enter(&zfsdev_state_lock); 879 880 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 881 if (zv == NULL) { 882 mutex_exit(&zfsdev_state_lock); 883 return (ENXIO); 884 } 885 886 if (zv->zv_flags & ZVOL_EXCL) { 887 ASSERT(zv->zv_total_opens == 1); 888 zv->zv_flags &= ~ZVOL_EXCL; 889 } 890 891 /* 892 * If the open count is zero, this is a spurious close. 893 * That indicates a bug in the kernel / DDI framework. 894 */ 895 ASSERT(zv->zv_open_count[otyp] != 0); 896 ASSERT(zv->zv_total_opens != 0); 897 898 /* 899 * You may get multiple opens, but only one close. 900 */ 901 zv->zv_open_count[otyp]--; 902 zv->zv_total_opens--; 903 904 if (zv->zv_total_opens == 0) 905 zvol_last_close(zv); 906 907 mutex_exit(&zfsdev_state_lock); 908 return (error); 909 } 910 911 static void 912 zvol_get_done(zgd_t *zgd, int error) 913 { 914 if (zgd->zgd_db) 915 dmu_buf_rele(zgd->zgd_db, zgd); 916 917 zfs_range_unlock(zgd->zgd_rl); 918 919 if (error == 0 && zgd->zgd_bp) 920 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 921 922 kmem_free(zgd, sizeof (zgd_t)); 923 } 924 925 /* 926 * Get data to generate a TX_WRITE intent log record. 927 */ 928 static int 929 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 930 { 931 zvol_state_t *zv = arg; 932 objset_t *os = zv->zv_objset; 933 uint64_t object = ZVOL_OBJ; 934 uint64_t offset = lr->lr_offset; 935 uint64_t size = lr->lr_length; /* length of user data */ 936 blkptr_t *bp = &lr->lr_blkptr; 937 dmu_buf_t *db; 938 zgd_t *zgd; 939 int error; 940 941 ASSERT(zio != NULL); 942 ASSERT(size != 0); 943 944 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 945 zgd->zgd_zilog = zv->zv_zilog; 946 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); 947 948 /* 949 * Write records come in two flavors: immediate and indirect. 950 * For small writes it's cheaper to store the data with the 951 * log record (immediate); for large writes it's cheaper to 952 * sync the data and get a pointer to it (indirect) so that 953 * we don't have to write the data twice. 954 */ 955 if (buf != NULL) { /* immediate write */ 956 error = dmu_read(os, object, offset, size, buf, 957 DMU_READ_NO_PREFETCH); 958 } else { 959 size = zv->zv_volblocksize; 960 offset = P2ALIGN(offset, size); 961 error = dmu_buf_hold(os, object, offset, zgd, &db, 962 DMU_READ_NO_PREFETCH); 963 if (error == 0) { 964 zgd->zgd_db = db; 965 zgd->zgd_bp = bp; 966 967 ASSERT(db->db_offset == offset); 968 ASSERT(db->db_size == size); 969 970 error = dmu_sync(zio, lr->lr_common.lrc_txg, 971 zvol_get_done, zgd); 972 973 if (error == 0) 974 return (0); 975 } 976 } 977 978 zvol_get_done(zgd, error); 979 980 return (error); 981 } 982 983 /* 984 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 985 * 986 * We store data in the log buffers if it's small enough. 987 * Otherwise we will later flush the data out via dmu_sync(). 988 */ 989 ssize_t zvol_immediate_write_sz = 32768; 990 991 static void 992 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 993 boolean_t sync) 994 { 995 uint32_t blocksize = zv->zv_volblocksize; 996 zilog_t *zilog = zv->zv_zilog; 997 boolean_t slogging; 998 ssize_t immediate_write_sz; 999 1000 if (zil_replaying(zilog, tx)) 1001 return; 1002 1003 immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1004 ? 0 : zvol_immediate_write_sz; 1005 1006 slogging = spa_has_slogs(zilog->zl_spa) && 1007 (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); 1008 1009 while (resid) { 1010 itx_t *itx; 1011 lr_write_t *lr; 1012 ssize_t len; 1013 itx_wr_state_t write_state; 1014 1015 /* 1016 * Unlike zfs_log_write() we can be called with 1017 * upto DMU_MAX_ACCESS/2 (5MB) writes. 1018 */ 1019 if (blocksize > immediate_write_sz && !slogging && 1020 resid >= blocksize && off % blocksize == 0) { 1021 write_state = WR_INDIRECT; /* uses dmu_sync */ 1022 len = blocksize; 1023 } else if (sync) { 1024 write_state = WR_COPIED; 1025 len = MIN(ZIL_MAX_LOG_DATA, resid); 1026 } else { 1027 write_state = WR_NEED_COPY; 1028 len = MIN(ZIL_MAX_LOG_DATA, resid); 1029 } 1030 1031 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1032 (write_state == WR_COPIED ? len : 0)); 1033 lr = (lr_write_t *)&itx->itx_lr; 1034 if (write_state == WR_COPIED && dmu_read(zv->zv_objset, 1035 ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1036 zil_itx_destroy(itx); 1037 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1038 lr = (lr_write_t *)&itx->itx_lr; 1039 write_state = WR_NEED_COPY; 1040 } 1041 1042 itx->itx_wr_state = write_state; 1043 if (write_state == WR_NEED_COPY) 1044 itx->itx_sod += len; 1045 lr->lr_foid = ZVOL_OBJ; 1046 lr->lr_offset = off; 1047 lr->lr_length = len; 1048 lr->lr_blkoff = 0; 1049 BP_ZERO(&lr->lr_blkptr); 1050 1051 itx->itx_private = zv; 1052 itx->itx_sync = sync; 1053 1054 zil_itx_assign(zilog, itx, tx); 1055 1056 off += len; 1057 resid -= len; 1058 } 1059 } 1060 1061 static int 1062 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 1063 boolean_t doread, boolean_t isdump) 1064 { 1065 vdev_disk_t *dvd; 1066 int c; 1067 int numerrors = 0; 1068 1069 for (c = 0; c < vd->vdev_children; c++) { 1070 ASSERT(vd->vdev_ops == &vdev_mirror_ops || 1071 vd->vdev_ops == &vdev_replacing_ops || 1072 vd->vdev_ops == &vdev_spare_ops); 1073 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1074 addr, offset, size, doread, isdump); 1075 if (err != 0) { 1076 numerrors++; 1077 } else if (doread) { 1078 break; 1079 } 1080 } 1081 1082 if (!vd->vdev_ops->vdev_op_leaf) 1083 return (numerrors < vd->vdev_children ? 0 : EIO); 1084 1085 if (doread && !vdev_readable(vd)) 1086 return (EIO); 1087 else if (!doread && !vdev_writeable(vd)) 1088 return (EIO); 1089 1090 dvd = vd->vdev_tsd; 1091 ASSERT3P(dvd, !=, NULL); 1092 offset += VDEV_LABEL_START_SIZE; 1093 1094 if (ddi_in_panic() || isdump) { 1095 ASSERT(!doread); 1096 if (doread) 1097 return (EIO); 1098 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1099 lbtodb(size))); 1100 } else { 1101 return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 1102 doread ? B_READ : B_WRITE)); 1103 } 1104 } 1105 1106 static int 1107 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1108 boolean_t doread, boolean_t isdump) 1109 { 1110 vdev_t *vd; 1111 int error; 1112 zvol_extent_t *ze; 1113 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1114 1115 /* Must be sector aligned, and not stradle a block boundary. */ 1116 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1117 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1118 return (EINVAL); 1119 } 1120 ASSERT(size <= zv->zv_volblocksize); 1121 1122 /* Locate the extent this belongs to */ 1123 ze = list_head(&zv->zv_extents); 1124 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1125 offset -= ze->ze_nblks * zv->zv_volblocksize; 1126 ze = list_next(&zv->zv_extents, ze); 1127 } 1128 1129 if (!ddi_in_panic()) 1130 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1131 1132 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1133 offset += DVA_GET_OFFSET(&ze->ze_dva); 1134 error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 1135 1136 if (!ddi_in_panic()) 1137 spa_config_exit(spa, SCL_STATE, FTAG); 1138 1139 return (error); 1140 } 1141 1142 int 1143 zvol_strategy(buf_t *bp) 1144 { 1145 zfs_soft_state_t *zs = NULL; 1146 zvol_state_t *zv; 1147 uint64_t off, volsize; 1148 size_t resid; 1149 char *addr; 1150 objset_t *os; 1151 rl_t *rl; 1152 int error = 0; 1153 boolean_t doread = bp->b_flags & B_READ; 1154 boolean_t is_dump; 1155 boolean_t sync; 1156 1157 if (getminor(bp->b_edev) == 0) { 1158 error = EINVAL; 1159 } else { 1160 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1161 if (zs == NULL) 1162 error = ENXIO; 1163 else if (zs->zss_type != ZSST_ZVOL) 1164 error = EINVAL; 1165 } 1166 1167 if (error) { 1168 bioerror(bp, error); 1169 biodone(bp); 1170 return (0); 1171 } 1172 1173 zv = zs->zss_data; 1174 1175 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1176 bioerror(bp, EROFS); 1177 biodone(bp); 1178 return (0); 1179 } 1180 1181 off = ldbtob(bp->b_blkno); 1182 volsize = zv->zv_volsize; 1183 1184 os = zv->zv_objset; 1185 ASSERT(os != NULL); 1186 1187 bp_mapin(bp); 1188 addr = bp->b_un.b_addr; 1189 resid = bp->b_bcount; 1190 1191 if (resid > 0 && (off < 0 || off >= volsize)) { 1192 bioerror(bp, EIO); 1193 biodone(bp); 1194 return (0); 1195 } 1196 1197 is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 1198 sync = ((!(bp->b_flags & B_ASYNC) && 1199 !(zv->zv_flags & ZVOL_WCE)) || 1200 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1201 !doread && !is_dump; 1202 1203 /* 1204 * There must be no buffer changes when doing a dmu_sync() because 1205 * we can't change the data whilst calculating the checksum. 1206 */ 1207 rl = zfs_range_lock(&zv->zv_znode, off, resid, 1208 doread ? RL_READER : RL_WRITER); 1209 1210 while (resid != 0 && off < volsize) { 1211 size_t size = MIN(resid, zvol_maxphys); 1212 if (is_dump) { 1213 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1214 error = zvol_dumpio(zv, addr, off, size, 1215 doread, B_FALSE); 1216 } else if (doread) { 1217 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1218 DMU_READ_PREFETCH); 1219 } else { 1220 dmu_tx_t *tx = dmu_tx_create(os); 1221 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1222 error = dmu_tx_assign(tx, TXG_WAIT); 1223 if (error) { 1224 dmu_tx_abort(tx); 1225 } else { 1226 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1227 zvol_log_write(zv, tx, off, size, sync); 1228 dmu_tx_commit(tx); 1229 } 1230 } 1231 if (error) { 1232 /* convert checksum errors into IO errors */ 1233 if (error == ECKSUM) 1234 error = EIO; 1235 break; 1236 } 1237 off += size; 1238 addr += size; 1239 resid -= size; 1240 } 1241 zfs_range_unlock(rl); 1242 1243 if ((bp->b_resid = resid) == bp->b_bcount) 1244 bioerror(bp, off > volsize ? EINVAL : error); 1245 1246 if (sync) 1247 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1248 biodone(bp); 1249 1250 return (0); 1251 } 1252 1253 /* 1254 * Set the buffer count to the zvol maximum transfer. 1255 * Using our own routine instead of the default minphys() 1256 * means that for larger writes we write bigger buffers on X86 1257 * (128K instead of 56K) and flush the disk write cache less often 1258 * (every zvol_maxphys - currently 1MB) instead of minphys (currently 1259 * 56K on X86 and 128K on sparc). 1260 */ 1261 void 1262 zvol_minphys(struct buf *bp) 1263 { 1264 if (bp->b_bcount > zvol_maxphys) 1265 bp->b_bcount = zvol_maxphys; 1266 } 1267 1268 int 1269 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1270 { 1271 minor_t minor = getminor(dev); 1272 zvol_state_t *zv; 1273 int error = 0; 1274 uint64_t size; 1275 uint64_t boff; 1276 uint64_t resid; 1277 1278 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1279 if (zv == NULL) 1280 return (ENXIO); 1281 1282 boff = ldbtob(blkno); 1283 resid = ldbtob(nblocks); 1284 1285 VERIFY3U(boff + resid, <=, zv->zv_volsize); 1286 1287 while (resid) { 1288 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 1289 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1290 if (error) 1291 break; 1292 boff += size; 1293 addr += size; 1294 resid -= size; 1295 } 1296 1297 return (error); 1298 } 1299 1300 /*ARGSUSED*/ 1301 int 1302 zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1303 { 1304 minor_t minor = getminor(dev); 1305 zvol_state_t *zv; 1306 uint64_t volsize; 1307 rl_t *rl; 1308 int error = 0; 1309 1310 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1311 if (zv == NULL) 1312 return (ENXIO); 1313 1314 volsize = zv->zv_volsize; 1315 if (uio->uio_resid > 0 && 1316 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1317 return (EIO); 1318 1319 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1320 error = physio(zvol_strategy, NULL, dev, B_READ, 1321 zvol_minphys, uio); 1322 return (error); 1323 } 1324 1325 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1326 RL_READER); 1327 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1328 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1329 1330 /* don't read past the end */ 1331 if (bytes > volsize - uio->uio_loffset) 1332 bytes = volsize - uio->uio_loffset; 1333 1334 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1335 if (error) { 1336 /* convert checksum errors into IO errors */ 1337 if (error == ECKSUM) 1338 error = EIO; 1339 break; 1340 } 1341 } 1342 zfs_range_unlock(rl); 1343 return (error); 1344 } 1345 1346 /*ARGSUSED*/ 1347 int 1348 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1349 { 1350 minor_t minor = getminor(dev); 1351 zvol_state_t *zv; 1352 uint64_t volsize; 1353 rl_t *rl; 1354 int error = 0; 1355 boolean_t sync; 1356 1357 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1358 if (zv == NULL) 1359 return (ENXIO); 1360 1361 volsize = zv->zv_volsize; 1362 if (uio->uio_resid > 0 && 1363 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1364 return (EIO); 1365 1366 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1367 error = physio(zvol_strategy, NULL, dev, B_WRITE, 1368 zvol_minphys, uio); 1369 return (error); 1370 } 1371 1372 sync = !(zv->zv_flags & ZVOL_WCE) || 1373 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1374 1375 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1376 RL_WRITER); 1377 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1378 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1379 uint64_t off = uio->uio_loffset; 1380 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1381 1382 if (bytes > volsize - off) /* don't write past the end */ 1383 bytes = volsize - off; 1384 1385 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1386 error = dmu_tx_assign(tx, TXG_WAIT); 1387 if (error) { 1388 dmu_tx_abort(tx); 1389 break; 1390 } 1391 error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx); 1392 if (error == 0) 1393 zvol_log_write(zv, tx, off, bytes, sync); 1394 dmu_tx_commit(tx); 1395 1396 if (error) 1397 break; 1398 } 1399 zfs_range_unlock(rl); 1400 if (sync) 1401 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1402 return (error); 1403 } 1404 1405 int 1406 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1407 { 1408 struct uuid uuid = EFI_RESERVED; 1409 efi_gpe_t gpe = { 0 }; 1410 uint32_t crc; 1411 dk_efi_t efi; 1412 int length; 1413 char *ptr; 1414 1415 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1416 return (EFAULT); 1417 ptr = (char *)(uintptr_t)efi.dki_data_64; 1418 length = efi.dki_length; 1419 /* 1420 * Some clients may attempt to request a PMBR for the 1421 * zvol. Currently this interface will return EINVAL to 1422 * such requests. These requests could be supported by 1423 * adding a check for lba == 0 and consing up an appropriate 1424 * PMBR. 1425 */ 1426 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1427 return (EINVAL); 1428 1429 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1430 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1431 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1432 1433 if (efi.dki_lba == 1) { 1434 efi_gpt_t gpt = { 0 }; 1435 1436 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1437 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1438 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1439 gpt.efi_gpt_MyLBA = LE_64(1ULL); 1440 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1441 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1442 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1443 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1444 gpt.efi_gpt_SizeOfPartitionEntry = 1445 LE_32(sizeof (efi_gpe_t)); 1446 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1447 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1448 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1449 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1450 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1451 flag)) 1452 return (EFAULT); 1453 ptr += sizeof (gpt); 1454 length -= sizeof (gpt); 1455 } 1456 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1457 length), flag)) 1458 return (EFAULT); 1459 return (0); 1460 } 1461 1462 /* 1463 * BEGIN entry points to allow external callers access to the volume. 1464 */ 1465 /* 1466 * Return the volume parameters needed for access from an external caller. 1467 * These values are invariant as long as the volume is held open. 1468 */ 1469 int 1470 zvol_get_volume_params(minor_t minor, uint64_t *blksize, 1471 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 1472 void **rl_hdl, void **bonus_hdl) 1473 { 1474 zvol_state_t *zv; 1475 1476 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1477 if (zv == NULL) 1478 return (ENXIO); 1479 if (zv->zv_flags & ZVOL_DUMPIFIED) 1480 return (ENXIO); 1481 1482 ASSERT(blksize && max_xfer_len && minor_hdl && 1483 objset_hdl && zil_hdl && rl_hdl && bonus_hdl); 1484 1485 *blksize = zv->zv_volblocksize; 1486 *max_xfer_len = (uint64_t)zvol_maxphys; 1487 *minor_hdl = zv; 1488 *objset_hdl = zv->zv_objset; 1489 *zil_hdl = zv->zv_zilog; 1490 *rl_hdl = &zv->zv_znode; 1491 *bonus_hdl = zv->zv_dbuf; 1492 return (0); 1493 } 1494 1495 /* 1496 * Return the current volume size to an external caller. 1497 * The size can change while the volume is open. 1498 */ 1499 uint64_t 1500 zvol_get_volume_size(void *minor_hdl) 1501 { 1502 zvol_state_t *zv = minor_hdl; 1503 1504 return (zv->zv_volsize); 1505 } 1506 1507 /* 1508 * Return the current WCE setting to an external caller. 1509 * The WCE setting can change while the volume is open. 1510 */ 1511 int 1512 zvol_get_volume_wce(void *minor_hdl) 1513 { 1514 zvol_state_t *zv = minor_hdl; 1515 1516 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 1517 } 1518 1519 /* 1520 * Entry point for external callers to zvol_log_write 1521 */ 1522 void 1523 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 1524 boolean_t sync) 1525 { 1526 zvol_state_t *zv = minor_hdl; 1527 1528 zvol_log_write(zv, tx, off, resid, sync); 1529 } 1530 /* 1531 * END entry points to allow external callers access to the volume. 1532 */ 1533 1534 /* 1535 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 1536 */ 1537 static void 1538 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 1539 boolean_t sync) 1540 { 1541 itx_t *itx; 1542 lr_truncate_t *lr; 1543 zilog_t *zilog = zv->zv_zilog; 1544 1545 if (zil_replaying(zilog, tx)) 1546 return; 1547 1548 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 1549 lr = (lr_truncate_t *)&itx->itx_lr; 1550 lr->lr_foid = ZVOL_OBJ; 1551 lr->lr_offset = off; 1552 lr->lr_length = len; 1553 1554 itx->itx_sync = sync; 1555 zil_itx_assign(zilog, itx, tx); 1556 } 1557 1558 /* 1559 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1560 * Also a dirtbag dkio ioctl for unmap/free-block functionality. 1561 */ 1562 /*ARGSUSED*/ 1563 int 1564 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1565 { 1566 zvol_state_t *zv; 1567 struct dk_cinfo dki; 1568 struct dk_minfo dkm; 1569 struct dk_callback *dkc; 1570 int error = 0; 1571 rl_t *rl; 1572 1573 mutex_enter(&zfsdev_state_lock); 1574 1575 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1576 1577 if (zv == NULL) { 1578 mutex_exit(&zfsdev_state_lock); 1579 return (ENXIO); 1580 } 1581 ASSERT(zv->zv_total_opens > 0); 1582 1583 switch (cmd) { 1584 1585 case DKIOCINFO: 1586 bzero(&dki, sizeof (dki)); 1587 (void) strcpy(dki.dki_cname, "zvol"); 1588 (void) strcpy(dki.dki_dname, "zvol"); 1589 dki.dki_ctype = DKC_UNKNOWN; 1590 dki.dki_unit = getminor(dev); 1591 dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1592 mutex_exit(&zfsdev_state_lock); 1593 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1594 error = EFAULT; 1595 return (error); 1596 1597 case DKIOCGMEDIAINFO: 1598 bzero(&dkm, sizeof (dkm)); 1599 dkm.dki_lbsize = 1U << zv->zv_min_bs; 1600 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1601 dkm.dki_media_type = DK_UNKNOWN; 1602 mutex_exit(&zfsdev_state_lock); 1603 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1604 error = EFAULT; 1605 return (error); 1606 1607 case DKIOCGETEFI: 1608 { 1609 uint64_t vs = zv->zv_volsize; 1610 uint8_t bs = zv->zv_min_bs; 1611 1612 mutex_exit(&zfsdev_state_lock); 1613 error = zvol_getefi((void *)arg, flag, vs, bs); 1614 return (error); 1615 } 1616 1617 case DKIOCFLUSHWRITECACHE: 1618 dkc = (struct dk_callback *)arg; 1619 mutex_exit(&zfsdev_state_lock); 1620 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1621 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1622 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1623 error = 0; 1624 } 1625 return (error); 1626 1627 case DKIOCGETWCE: 1628 { 1629 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1630 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1631 flag)) 1632 error = EFAULT; 1633 break; 1634 } 1635 case DKIOCSETWCE: 1636 { 1637 int wce; 1638 if (ddi_copyin((void *)arg, &wce, sizeof (int), 1639 flag)) { 1640 error = EFAULT; 1641 break; 1642 } 1643 if (wce) { 1644 zv->zv_flags |= ZVOL_WCE; 1645 mutex_exit(&zfsdev_state_lock); 1646 } else { 1647 zv->zv_flags &= ~ZVOL_WCE; 1648 mutex_exit(&zfsdev_state_lock); 1649 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1650 } 1651 return (0); 1652 } 1653 1654 case DKIOCGGEOM: 1655 case DKIOCGVTOC: 1656 /* 1657 * commands using these (like prtvtoc) expect ENOTSUP 1658 * since we're emulating an EFI label 1659 */ 1660 error = ENOTSUP; 1661 break; 1662 1663 case DKIOCDUMPINIT: 1664 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1665 RL_WRITER); 1666 error = zvol_dumpify(zv); 1667 zfs_range_unlock(rl); 1668 break; 1669 1670 case DKIOCDUMPFINI: 1671 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 1672 break; 1673 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1674 RL_WRITER); 1675 error = zvol_dump_fini(zv); 1676 zfs_range_unlock(rl); 1677 break; 1678 1679 case DKIOCFREE: 1680 { 1681 dkioc_free_t df; 1682 dmu_tx_t *tx; 1683 1684 if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) { 1685 error = EFAULT; 1686 break; 1687 } 1688 1689 /* 1690 * Apply Postel's Law to length-checking. If they overshoot, 1691 * just blank out until the end, if there's a need to blank 1692 * out anything. 1693 */ 1694 if (df.df_start >= zv->zv_volsize) 1695 break; /* No need to do anything... */ 1696 if (df.df_start + df.df_length > zv->zv_volsize) 1697 df.df_length = DMU_OBJECT_END; 1698 1699 rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length, 1700 RL_WRITER); 1701 tx = dmu_tx_create(zv->zv_objset); 1702 error = dmu_tx_assign(tx, TXG_WAIT); 1703 if (error != 0) { 1704 dmu_tx_abort(tx); 1705 } else { 1706 zvol_log_truncate(zv, tx, df.df_start, 1707 df.df_length, B_TRUE); 1708 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 1709 df.df_start, df.df_length); 1710 dmu_tx_commit(tx); 1711 } 1712 1713 zfs_range_unlock(rl); 1714 1715 if (error == 0) { 1716 /* 1717 * If the write-cache is disabled or 'sync' property 1718 * is set to 'always' then treat this as a synchronous 1719 * operation (i.e. commit to zil). 1720 */ 1721 if (!(zv->zv_flags & ZVOL_WCE) || 1722 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) 1723 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1724 1725 /* 1726 * If the caller really wants synchronous writes, and 1727 * can't wait for them, don't return until the write 1728 * is done. 1729 */ 1730 if (df.df_flags & DF_WAIT_SYNC) { 1731 txg_wait_synced( 1732 dmu_objset_pool(zv->zv_objset), 0); 1733 } 1734 } 1735 break; 1736 } 1737 1738 default: 1739 error = ENOTTY; 1740 break; 1741 1742 } 1743 mutex_exit(&zfsdev_state_lock); 1744 return (error); 1745 } 1746 1747 int 1748 zvol_busy(void) 1749 { 1750 return (zvol_minors != 0); 1751 } 1752 1753 void 1754 zvol_init(void) 1755 { 1756 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1757 1) == 0); 1758 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1759 } 1760 1761 void 1762 zvol_fini(void) 1763 { 1764 mutex_destroy(&zfsdev_state_lock); 1765 ddi_soft_state_fini(&zfsdev_state); 1766 } 1767 1768 static int 1769 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1770 { 1771 dmu_tx_t *tx; 1772 int error = 0; 1773 objset_t *os = zv->zv_objset; 1774 nvlist_t *nv = NULL; 1775 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1776 1777 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1778 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1779 DMU_OBJECT_END); 1780 /* wait for dmu_free_long_range to actually free the blocks */ 1781 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1782 1783 tx = dmu_tx_create(os); 1784 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1785 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1786 error = dmu_tx_assign(tx, TXG_WAIT); 1787 if (error) { 1788 dmu_tx_abort(tx); 1789 return (error); 1790 } 1791 1792 /* 1793 * If we are resizing the dump device then we only need to 1794 * update the refreservation to match the newly updated 1795 * zvolsize. Otherwise, we save off the original state of the 1796 * zvol so that we can restore them if the zvol is ever undumpified. 1797 */ 1798 if (resize) { 1799 error = zap_update(os, ZVOL_ZAP_OBJ, 1800 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1801 &zv->zv_volsize, tx); 1802 } else { 1803 uint64_t checksum, compress, refresrv, vbs, dedup; 1804 1805 error = dsl_prop_get_integer(zv->zv_name, 1806 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1807 error = error ? error : dsl_prop_get_integer(zv->zv_name, 1808 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1809 error = error ? error : dsl_prop_get_integer(zv->zv_name, 1810 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 1811 error = error ? error : dsl_prop_get_integer(zv->zv_name, 1812 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 1813 if (version >= SPA_VERSION_DEDUP) { 1814 error = error ? error : 1815 dsl_prop_get_integer(zv->zv_name, 1816 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 1817 } 1818 1819 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1820 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1821 &compress, tx); 1822 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1823 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1824 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1825 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1826 &refresrv, tx); 1827 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1828 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 1829 &vbs, tx); 1830 error = error ? error : dmu_object_set_blocksize( 1831 os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx); 1832 if (version >= SPA_VERSION_DEDUP) { 1833 error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1834 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 1835 &dedup, tx); 1836 } 1837 if (error == 0) 1838 zv->zv_volblocksize = SPA_MAXBLOCKSIZE; 1839 } 1840 dmu_tx_commit(tx); 1841 1842 /* 1843 * We only need update the zvol's property if we are initializing 1844 * the dump area for the first time. 1845 */ 1846 if (!resize) { 1847 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1848 VERIFY(nvlist_add_uint64(nv, 1849 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1850 VERIFY(nvlist_add_uint64(nv, 1851 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1852 ZIO_COMPRESS_OFF) == 0); 1853 VERIFY(nvlist_add_uint64(nv, 1854 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1855 ZIO_CHECKSUM_OFF) == 0); 1856 if (version >= SPA_VERSION_DEDUP) { 1857 VERIFY(nvlist_add_uint64(nv, 1858 zfs_prop_to_name(ZFS_PROP_DEDUP), 1859 ZIO_CHECKSUM_OFF) == 0); 1860 } 1861 1862 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 1863 nv, NULL); 1864 nvlist_free(nv); 1865 1866 if (error) 1867 return (error); 1868 } 1869 1870 /* Allocate the space for the dump */ 1871 error = zvol_prealloc(zv); 1872 return (error); 1873 } 1874 1875 static int 1876 zvol_dumpify(zvol_state_t *zv) 1877 { 1878 int error = 0; 1879 uint64_t dumpsize = 0; 1880 dmu_tx_t *tx; 1881 objset_t *os = zv->zv_objset; 1882 1883 if (zv->zv_flags & ZVOL_RDONLY) 1884 return (EROFS); 1885 1886 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1887 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 1888 boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; 1889 1890 if ((error = zvol_dump_init(zv, resize)) != 0) { 1891 (void) zvol_dump_fini(zv); 1892 return (error); 1893 } 1894 } 1895 1896 /* 1897 * Build up our lba mapping. 1898 */ 1899 error = zvol_get_lbas(zv); 1900 if (error) { 1901 (void) zvol_dump_fini(zv); 1902 return (error); 1903 } 1904 1905 tx = dmu_tx_create(os); 1906 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1907 error = dmu_tx_assign(tx, TXG_WAIT); 1908 if (error) { 1909 dmu_tx_abort(tx); 1910 (void) zvol_dump_fini(zv); 1911 return (error); 1912 } 1913 1914 zv->zv_flags |= ZVOL_DUMPIFIED; 1915 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1916 &zv->zv_volsize, tx); 1917 dmu_tx_commit(tx); 1918 1919 if (error) { 1920 (void) zvol_dump_fini(zv); 1921 return (error); 1922 } 1923 1924 txg_wait_synced(dmu_objset_pool(os), 0); 1925 return (0); 1926 } 1927 1928 static int 1929 zvol_dump_fini(zvol_state_t *zv) 1930 { 1931 dmu_tx_t *tx; 1932 objset_t *os = zv->zv_objset; 1933 nvlist_t *nv; 1934 int error = 0; 1935 uint64_t checksum, compress, refresrv, vbs, dedup; 1936 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1937 1938 /* 1939 * Attempt to restore the zvol back to its pre-dumpified state. 1940 * This is a best-effort attempt as it's possible that not all 1941 * of these properties were initialized during the dumpify process 1942 * (i.e. error during zvol_dump_init). 1943 */ 1944 1945 tx = dmu_tx_create(os); 1946 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1947 error = dmu_tx_assign(tx, TXG_WAIT); 1948 if (error) { 1949 dmu_tx_abort(tx); 1950 return (error); 1951 } 1952 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1953 dmu_tx_commit(tx); 1954 1955 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1956 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1957 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1958 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1959 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1960 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 1961 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1962 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1963 1964 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1965 (void) nvlist_add_uint64(nv, 1966 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1967 (void) nvlist_add_uint64(nv, 1968 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1969 (void) nvlist_add_uint64(nv, 1970 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 1971 if (version >= SPA_VERSION_DEDUP && 1972 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1973 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 1974 (void) nvlist_add_uint64(nv, 1975 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 1976 } 1977 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 1978 nv, NULL); 1979 nvlist_free(nv); 1980 1981 zvol_free_extents(zv); 1982 zv->zv_flags &= ~ZVOL_DUMPIFIED; 1983 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 1984 /* wait for dmu_free_long_range to actually free the blocks */ 1985 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1986 tx = dmu_tx_create(os); 1987 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1988 error = dmu_tx_assign(tx, TXG_WAIT); 1989 if (error) { 1990 dmu_tx_abort(tx); 1991 return (error); 1992 } 1993 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 1994 zv->zv_volblocksize = vbs; 1995 dmu_tx_commit(tx); 1996 1997 return (0); 1998 } 1999