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 2017 Nexenta Systems, Inc. All rights reserved. 27 * Copyright (c) 2012, 2017 by Delphix. All rights reserved. 28 * Copyright (c) 2013, Joyent, Inc. All rights reserved. 29 * Copyright (c) 2014 Integros [integros.com] 30 */ 31 32 /* 33 * ZFS volume emulation driver. 34 * 35 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 36 * Volumes are accessed through the symbolic links named: 37 * 38 * /dev/zvol/dsk/<pool_name>/<dataset_name> 39 * /dev/zvol/rdsk/<pool_name>/<dataset_name> 40 * 41 * These links are created by the /dev filesystem (sdev_zvolops.c). 42 * Volumes are persistent through reboot. No user command needs to be 43 * run before opening and using a device. 44 */ 45 46 #include <sys/types.h> 47 #include <sys/param.h> 48 #include <sys/errno.h> 49 #include <sys/uio.h> 50 #include <sys/buf.h> 51 #include <sys/modctl.h> 52 #include <sys/open.h> 53 #include <sys/kmem.h> 54 #include <sys/conf.h> 55 #include <sys/cmn_err.h> 56 #include <sys/stat.h> 57 #include <sys/zap.h> 58 #include <sys/spa.h> 59 #include <sys/spa_impl.h> 60 #include <sys/zio.h> 61 #include <sys/dmu_traverse.h> 62 #include <sys/dnode.h> 63 #include <sys/dsl_dataset.h> 64 #include <sys/dsl_prop.h> 65 #include <sys/dkio.h> 66 #include <sys/efi_partition.h> 67 #include <sys/byteorder.h> 68 #include <sys/pathname.h> 69 #include <sys/ddi.h> 70 #include <sys/sunddi.h> 71 #include <sys/crc32.h> 72 #include <sys/dirent.h> 73 #include <sys/policy.h> 74 #include <sys/fs/zfs.h> 75 #include <sys/zfs_ioctl.h> 76 #include <sys/mkdev.h> 77 #include <sys/zil.h> 78 #include <sys/refcount.h> 79 #include <sys/zfs_znode.h> 80 #include <sys/zfs_rlock.h> 81 #include <sys/vdev_disk.h> 82 #include <sys/vdev_impl.h> 83 #include <sys/vdev_raidz.h> 84 #include <sys/zvol.h> 85 #include <sys/dumphdr.h> 86 #include <sys/zil_impl.h> 87 #include <sys/dbuf.h> 88 #include <sys/dmu_tx.h> 89 #include <sys/zfeature.h> 90 #include <sys/zio_checksum.h> 91 #include <sys/zil_impl.h> 92 #include <sys/dkioc_free_util.h> 93 94 #include "zfs_namecheck.h" 95 96 void *zfsdev_state; 97 static char *zvol_tag = "zvol_tag"; 98 99 #define ZVOL_DUMPSIZE "dumpsize" 100 101 /* 102 * This lock protects the zfsdev_state structure from being modified 103 * while it's being used, e.g. an open that comes in before a create 104 * finishes. It also protects temporary opens of the dataset so that, 105 * e.g., an open doesn't get a spurious EBUSY. 106 */ 107 kmutex_t zfsdev_state_lock; 108 static uint32_t zvol_minors; 109 110 typedef struct zvol_extent { 111 list_node_t ze_node; 112 dva_t ze_dva; /* dva associated with this extent */ 113 uint64_t ze_nblks; /* number of blocks in extent */ 114 } zvol_extent_t; 115 116 /* 117 * The in-core state of each volume. 118 */ 119 typedef struct zvol_state { 120 char zv_name[MAXPATHLEN]; /* pool/dd name */ 121 uint64_t zv_volsize; /* amount of space we advertise */ 122 uint64_t zv_volblocksize; /* volume block size */ 123 minor_t zv_minor; /* minor number */ 124 uint8_t zv_min_bs; /* minimum addressable block shift */ 125 uint8_t zv_flags; /* readonly, dumpified, etc. */ 126 objset_t *zv_objset; /* objset handle */ 127 uint32_t zv_open_count[OTYPCNT]; /* open counts */ 128 uint32_t zv_total_opens; /* total open count */ 129 zilog_t *zv_zilog; /* ZIL handle */ 130 list_t zv_extents; /* List of extents for dump */ 131 znode_t zv_znode; /* for range locking */ 132 dnode_t *zv_dn; /* dnode hold */ 133 } zvol_state_t; 134 135 /* 136 * zvol specific flags 137 */ 138 #define ZVOL_RDONLY 0x1 139 #define ZVOL_DUMPIFIED 0x2 140 #define ZVOL_EXCL 0x4 141 #define ZVOL_WCE 0x8 142 143 /* 144 * zvol maximum transfer in one DMU tx. 145 */ 146 int zvol_maxphys = DMU_MAX_ACCESS/2; 147 148 /* 149 * Toggle unmap functionality. 150 */ 151 boolean_t zvol_unmap_enabled = B_TRUE; 152 153 /* 154 * If true, unmaps requested as synchronous are executed synchronously, 155 * otherwise all unmaps are asynchronous. 156 */ 157 boolean_t zvol_unmap_sync_enabled = B_FALSE; 158 159 extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 160 nvlist_t *, nvlist_t *); 161 static int zvol_remove_zv(zvol_state_t *); 162 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, 163 struct lwb *lwb, zio_t *zio); 164 static int zvol_dumpify(zvol_state_t *zv); 165 static int zvol_dump_fini(zvol_state_t *zv); 166 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 167 168 static void 169 zvol_size_changed(zvol_state_t *zv, uint64_t volsize) 170 { 171 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor); 172 173 zv->zv_volsize = volsize; 174 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 175 "Size", volsize) == DDI_SUCCESS); 176 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 177 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 178 179 /* Notify specfs to invalidate the cached size */ 180 spec_size_invalidate(dev, VBLK); 181 spec_size_invalidate(dev, VCHR); 182 } 183 184 int 185 zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 186 { 187 if (volsize == 0) 188 return (SET_ERROR(EINVAL)); 189 190 if (volsize % blocksize != 0) 191 return (SET_ERROR(EINVAL)); 192 193 #ifdef _ILP32 194 if (volsize - 1 > SPEC_MAXOFFSET_T) 195 return (SET_ERROR(EOVERFLOW)); 196 #endif 197 return (0); 198 } 199 200 int 201 zvol_check_volblocksize(uint64_t volblocksize) 202 { 203 if (volblocksize < SPA_MINBLOCKSIZE || 204 volblocksize > SPA_OLD_MAXBLOCKSIZE || 205 !ISP2(volblocksize)) 206 return (SET_ERROR(EDOM)); 207 208 return (0); 209 } 210 211 int 212 zvol_get_stats(objset_t *os, nvlist_t *nv) 213 { 214 int error; 215 dmu_object_info_t doi; 216 uint64_t val; 217 218 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 219 if (error) 220 return (error); 221 222 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 223 224 error = dmu_object_info(os, ZVOL_OBJ, &doi); 225 226 if (error == 0) { 227 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 228 doi.doi_data_block_size); 229 } 230 231 return (error); 232 } 233 234 static zvol_state_t * 235 zvol_minor_lookup(const char *name) 236 { 237 minor_t minor; 238 zvol_state_t *zv; 239 240 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 241 242 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 243 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 244 if (zv == NULL) 245 continue; 246 if (strcmp(zv->zv_name, name) == 0) 247 return (zv); 248 } 249 250 return (NULL); 251 } 252 253 /* extent mapping arg */ 254 struct maparg { 255 zvol_state_t *ma_zv; 256 uint64_t ma_blks; 257 }; 258 259 /*ARGSUSED*/ 260 static int 261 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 262 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 263 { 264 struct maparg *ma = arg; 265 zvol_extent_t *ze; 266 int bs = ma->ma_zv->zv_volblocksize; 267 268 if (bp == NULL || BP_IS_HOLE(bp) || 269 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 270 return (0); 271 272 VERIFY(!BP_IS_EMBEDDED(bp)); 273 274 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 275 ma->ma_blks++; 276 277 /* Abort immediately if we have encountered gang blocks */ 278 if (BP_IS_GANG(bp)) 279 return (SET_ERROR(EFRAGS)); 280 281 /* 282 * See if the block is at the end of the previous extent. 283 */ 284 ze = list_tail(&ma->ma_zv->zv_extents); 285 if (ze && 286 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 287 DVA_GET_OFFSET(BP_IDENTITY(bp)) == 288 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 289 ze->ze_nblks++; 290 return (0); 291 } 292 293 dprintf_bp(bp, "%s", "next blkptr:"); 294 295 /* start a new extent */ 296 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 297 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 298 ze->ze_nblks = 1; 299 list_insert_tail(&ma->ma_zv->zv_extents, ze); 300 return (0); 301 } 302 303 static void 304 zvol_free_extents(zvol_state_t *zv) 305 { 306 zvol_extent_t *ze; 307 308 while (ze = list_head(&zv->zv_extents)) { 309 list_remove(&zv->zv_extents, ze); 310 kmem_free(ze, sizeof (zvol_extent_t)); 311 } 312 } 313 314 static int 315 zvol_get_lbas(zvol_state_t *zv) 316 { 317 objset_t *os = zv->zv_objset; 318 struct maparg ma; 319 int err; 320 321 ma.ma_zv = zv; 322 ma.ma_blks = 0; 323 zvol_free_extents(zv); 324 325 /* commit any in-flight changes before traversing the dataset */ 326 txg_wait_synced(dmu_objset_pool(os), 0); 327 err = traverse_dataset(dmu_objset_ds(os), 0, 328 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 329 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 330 zvol_free_extents(zv); 331 return (err ? err : EIO); 332 } 333 334 return (0); 335 } 336 337 /* ARGSUSED */ 338 void 339 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 340 { 341 zfs_creat_t *zct = arg; 342 nvlist_t *nvprops = zct->zct_props; 343 int error; 344 uint64_t volblocksize, volsize; 345 346 VERIFY(nvlist_lookup_uint64(nvprops, 347 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 348 if (nvlist_lookup_uint64(nvprops, 349 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 350 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 351 352 /* 353 * These properties must be removed from the list so the generic 354 * property setting step won't apply to them. 355 */ 356 VERIFY(nvlist_remove_all(nvprops, 357 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 358 (void) nvlist_remove_all(nvprops, 359 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 360 361 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 362 DMU_OT_NONE, 0, tx); 363 ASSERT(error == 0); 364 365 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 366 DMU_OT_NONE, 0, tx); 367 ASSERT(error == 0); 368 369 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 370 ASSERT(error == 0); 371 } 372 373 /* 374 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 375 * implement DKIOCFREE/free-long-range. 376 */ 377 static int 378 zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap) 379 { 380 zvol_state_t *zv = arg1; 381 lr_truncate_t *lr = arg2; 382 uint64_t offset, length; 383 384 if (byteswap) 385 byteswap_uint64_array(lr, sizeof (*lr)); 386 387 offset = lr->lr_offset; 388 length = lr->lr_length; 389 390 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 391 } 392 393 /* 394 * Replay a TX_WRITE ZIL transaction that didn't get committed 395 * after a system failure 396 */ 397 static int 398 zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap) 399 { 400 zvol_state_t *zv = arg1; 401 lr_write_t *lr = arg2; 402 objset_t *os = zv->zv_objset; 403 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 404 uint64_t offset, length; 405 dmu_tx_t *tx; 406 int error; 407 408 if (byteswap) 409 byteswap_uint64_array(lr, sizeof (*lr)); 410 411 offset = lr->lr_offset; 412 length = lr->lr_length; 413 414 /* If it's a dmu_sync() block, write the whole block */ 415 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 416 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 417 if (length < blocksize) { 418 offset -= offset % blocksize; 419 length = blocksize; 420 } 421 } 422 423 tx = dmu_tx_create(os); 424 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 425 error = dmu_tx_assign(tx, TXG_WAIT); 426 if (error) { 427 dmu_tx_abort(tx); 428 } else { 429 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 430 dmu_tx_commit(tx); 431 } 432 433 return (error); 434 } 435 436 /* ARGSUSED */ 437 static int 438 zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap) 439 { 440 return (SET_ERROR(ENOTSUP)); 441 } 442 443 /* 444 * Callback vectors for replaying records. 445 * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 446 */ 447 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 448 zvol_replay_err, /* 0 no such transaction type */ 449 zvol_replay_err, /* TX_CREATE */ 450 zvol_replay_err, /* TX_MKDIR */ 451 zvol_replay_err, /* TX_MKXATTR */ 452 zvol_replay_err, /* TX_SYMLINK */ 453 zvol_replay_err, /* TX_REMOVE */ 454 zvol_replay_err, /* TX_RMDIR */ 455 zvol_replay_err, /* TX_LINK */ 456 zvol_replay_err, /* TX_RENAME */ 457 zvol_replay_write, /* TX_WRITE */ 458 zvol_replay_truncate, /* TX_TRUNCATE */ 459 zvol_replay_err, /* TX_SETATTR */ 460 zvol_replay_err, /* TX_ACL */ 461 zvol_replay_err, /* TX_CREATE_ACL */ 462 zvol_replay_err, /* TX_CREATE_ATTR */ 463 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 464 zvol_replay_err, /* TX_MKDIR_ACL */ 465 zvol_replay_err, /* TX_MKDIR_ATTR */ 466 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 467 zvol_replay_err, /* TX_WRITE2 */ 468 }; 469 470 int 471 zvol_name2minor(const char *name, minor_t *minor) 472 { 473 zvol_state_t *zv; 474 475 mutex_enter(&zfsdev_state_lock); 476 zv = zvol_minor_lookup(name); 477 if (minor && zv) 478 *minor = zv->zv_minor; 479 mutex_exit(&zfsdev_state_lock); 480 return (zv ? 0 : -1); 481 } 482 483 /* 484 * Create a minor node (plus a whole lot more) for the specified volume. 485 */ 486 int 487 zvol_create_minor(const char *name) 488 { 489 zfs_soft_state_t *zs; 490 zvol_state_t *zv; 491 objset_t *os; 492 dmu_object_info_t doi; 493 minor_t minor = 0; 494 char chrbuf[30], blkbuf[30]; 495 int error; 496 497 mutex_enter(&zfsdev_state_lock); 498 499 if (zvol_minor_lookup(name) != NULL) { 500 mutex_exit(&zfsdev_state_lock); 501 return (SET_ERROR(EEXIST)); 502 } 503 504 /* lie and say we're read-only */ 505 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); 506 507 if (error) { 508 mutex_exit(&zfsdev_state_lock); 509 return (error); 510 } 511 512 if ((minor = zfsdev_minor_alloc()) == 0) { 513 dmu_objset_disown(os, FTAG); 514 mutex_exit(&zfsdev_state_lock); 515 return (SET_ERROR(ENXIO)); 516 } 517 518 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 519 dmu_objset_disown(os, FTAG); 520 mutex_exit(&zfsdev_state_lock); 521 return (SET_ERROR(EAGAIN)); 522 } 523 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 524 (char *)name); 525 526 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 527 528 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 529 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 530 ddi_soft_state_free(zfsdev_state, minor); 531 dmu_objset_disown(os, FTAG); 532 mutex_exit(&zfsdev_state_lock); 533 return (SET_ERROR(EAGAIN)); 534 } 535 536 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 537 538 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 539 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 540 ddi_remove_minor_node(zfs_dip, chrbuf); 541 ddi_soft_state_free(zfsdev_state, minor); 542 dmu_objset_disown(os, FTAG); 543 mutex_exit(&zfsdev_state_lock); 544 return (SET_ERROR(EAGAIN)); 545 } 546 547 zs = ddi_get_soft_state(zfsdev_state, minor); 548 zs->zss_type = ZSST_ZVOL; 549 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 550 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 551 zv->zv_min_bs = DEV_BSHIFT; 552 zv->zv_minor = minor; 553 zv->zv_objset = os; 554 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 555 zv->zv_flags |= ZVOL_RDONLY; 556 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 557 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 558 sizeof (rl_t), offsetof(rl_t, r_node)); 559 list_create(&zv->zv_extents, sizeof (zvol_extent_t), 560 offsetof(zvol_extent_t, ze_node)); 561 /* get and cache the blocksize */ 562 error = dmu_object_info(os, ZVOL_OBJ, &doi); 563 ASSERT(error == 0); 564 zv->zv_volblocksize = doi.doi_data_block_size; 565 566 if (spa_writeable(dmu_objset_spa(os))) { 567 if (zil_replay_disable) 568 zil_destroy(dmu_objset_zil(os), B_FALSE); 569 else 570 zil_replay(os, zv, zvol_replay_vector); 571 } 572 dmu_objset_disown(os, FTAG); 573 zv->zv_objset = NULL; 574 575 zvol_minors++; 576 577 mutex_exit(&zfsdev_state_lock); 578 579 return (0); 580 } 581 582 /* 583 * Remove minor node for the specified volume. 584 */ 585 static int 586 zvol_remove_zv(zvol_state_t *zv) 587 { 588 char nmbuf[20]; 589 minor_t minor = zv->zv_minor; 590 591 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 592 if (zv->zv_total_opens != 0) 593 return (SET_ERROR(EBUSY)); 594 595 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 596 ddi_remove_minor_node(zfs_dip, nmbuf); 597 598 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 599 ddi_remove_minor_node(zfs_dip, nmbuf); 600 601 avl_destroy(&zv->zv_znode.z_range_avl); 602 mutex_destroy(&zv->zv_znode.z_range_lock); 603 604 kmem_free(zv, sizeof (zvol_state_t)); 605 606 ddi_soft_state_free(zfsdev_state, minor); 607 608 zvol_minors--; 609 return (0); 610 } 611 612 int 613 zvol_remove_minor(const char *name) 614 { 615 zvol_state_t *zv; 616 int rc; 617 618 mutex_enter(&zfsdev_state_lock); 619 if ((zv = zvol_minor_lookup(name)) == NULL) { 620 mutex_exit(&zfsdev_state_lock); 621 return (SET_ERROR(ENXIO)); 622 } 623 rc = zvol_remove_zv(zv); 624 mutex_exit(&zfsdev_state_lock); 625 return (rc); 626 } 627 628 int 629 zvol_first_open(zvol_state_t *zv) 630 { 631 objset_t *os; 632 uint64_t volsize; 633 int error; 634 uint64_t readonly; 635 636 /* lie and say we're read-only */ 637 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 638 zvol_tag, &os); 639 if (error) 640 return (error); 641 642 zv->zv_objset = os; 643 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 644 if (error) { 645 ASSERT(error == 0); 646 dmu_objset_disown(os, zvol_tag); 647 return (error); 648 } 649 650 error = dnode_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dn); 651 if (error) { 652 dmu_objset_disown(os, zvol_tag); 653 return (error); 654 } 655 656 zvol_size_changed(zv, volsize); 657 zv->zv_zilog = zil_open(os, zvol_get_data); 658 659 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 660 NULL) == 0); 661 if (readonly || dmu_objset_is_snapshot(os) || 662 !spa_writeable(dmu_objset_spa(os))) 663 zv->zv_flags |= ZVOL_RDONLY; 664 else 665 zv->zv_flags &= ~ZVOL_RDONLY; 666 return (error); 667 } 668 669 void 670 zvol_last_close(zvol_state_t *zv) 671 { 672 zil_close(zv->zv_zilog); 673 zv->zv_zilog = NULL; 674 675 dnode_rele(zv->zv_dn, zvol_tag); 676 zv->zv_dn = NULL; 677 678 /* 679 * Evict cached data 680 */ 681 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && 682 !(zv->zv_flags & ZVOL_RDONLY)) 683 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 684 dmu_objset_evict_dbufs(zv->zv_objset); 685 686 dmu_objset_disown(zv->zv_objset, zvol_tag); 687 zv->zv_objset = NULL; 688 } 689 690 int 691 zvol_prealloc(zvol_state_t *zv) 692 { 693 objset_t *os = zv->zv_objset; 694 dmu_tx_t *tx; 695 uint64_t refd, avail, usedobjs, availobjs; 696 uint64_t resid = zv->zv_volsize; 697 uint64_t off = 0; 698 699 /* Check the space usage before attempting to allocate the space */ 700 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 701 if (avail < zv->zv_volsize) 702 return (SET_ERROR(ENOSPC)); 703 704 /* Free old extents if they exist */ 705 zvol_free_extents(zv); 706 707 while (resid != 0) { 708 int error; 709 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE); 710 711 tx = dmu_tx_create(os); 712 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 713 error = dmu_tx_assign(tx, TXG_WAIT); 714 if (error) { 715 dmu_tx_abort(tx); 716 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 717 return (error); 718 } 719 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 720 dmu_tx_commit(tx); 721 off += bytes; 722 resid -= bytes; 723 } 724 txg_wait_synced(dmu_objset_pool(os), 0); 725 726 return (0); 727 } 728 729 static int 730 zvol_update_volsize(objset_t *os, uint64_t volsize) 731 { 732 dmu_tx_t *tx; 733 int error; 734 735 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 736 737 tx = dmu_tx_create(os); 738 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 739 dmu_tx_mark_netfree(tx); 740 error = dmu_tx_assign(tx, TXG_WAIT); 741 if (error) { 742 dmu_tx_abort(tx); 743 return (error); 744 } 745 746 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 747 &volsize, tx); 748 dmu_tx_commit(tx); 749 750 if (error == 0) 751 error = dmu_free_long_range(os, 752 ZVOL_OBJ, volsize, DMU_OBJECT_END); 753 return (error); 754 } 755 756 void 757 zvol_remove_minors(const char *name) 758 { 759 zvol_state_t *zv; 760 char *namebuf; 761 minor_t minor; 762 763 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 764 (void) strncpy(namebuf, name, strlen(name)); 765 (void) strcat(namebuf, "/"); 766 mutex_enter(&zfsdev_state_lock); 767 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 768 769 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 770 if (zv == NULL) 771 continue; 772 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 773 (void) zvol_remove_zv(zv); 774 } 775 kmem_free(namebuf, strlen(name) + 2); 776 777 mutex_exit(&zfsdev_state_lock); 778 } 779 780 static int 781 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) 782 { 783 uint64_t old_volsize = 0ULL; 784 int error = 0; 785 786 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 787 788 /* 789 * Reinitialize the dump area to the new size. If we 790 * failed to resize the dump area then restore it back to 791 * its original size. We must set the new volsize prior 792 * to calling dumpvp_resize() to ensure that the devices' 793 * size(9P) is not visible by the dump subsystem. 794 */ 795 old_volsize = zv->zv_volsize; 796 zvol_size_changed(zv, volsize); 797 798 if (zv->zv_flags & ZVOL_DUMPIFIED) { 799 if ((error = zvol_dumpify(zv)) != 0 || 800 (error = dumpvp_resize()) != 0) { 801 int dumpify_error; 802 803 (void) zvol_update_volsize(zv->zv_objset, old_volsize); 804 zvol_size_changed(zv, old_volsize); 805 dumpify_error = zvol_dumpify(zv); 806 error = dumpify_error ? dumpify_error : error; 807 } 808 } 809 810 /* 811 * Generate a LUN expansion event. 812 */ 813 if (error == 0) { 814 sysevent_id_t eid; 815 nvlist_t *attr; 816 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 817 818 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 819 zv->zv_minor); 820 821 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 822 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 823 824 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 825 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 826 827 nvlist_free(attr); 828 kmem_free(physpath, MAXPATHLEN); 829 } 830 return (error); 831 } 832 833 int 834 zvol_set_volsize(const char *name, uint64_t volsize) 835 { 836 zvol_state_t *zv = NULL; 837 objset_t *os; 838 int error; 839 dmu_object_info_t doi; 840 uint64_t readonly; 841 boolean_t owned = B_FALSE; 842 843 error = dsl_prop_get_integer(name, 844 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); 845 if (error != 0) 846 return (error); 847 if (readonly) 848 return (SET_ERROR(EROFS)); 849 850 mutex_enter(&zfsdev_state_lock); 851 zv = zvol_minor_lookup(name); 852 853 if (zv == NULL || zv->zv_objset == NULL) { 854 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, 855 FTAG, &os)) != 0) { 856 mutex_exit(&zfsdev_state_lock); 857 return (error); 858 } 859 owned = B_TRUE; 860 if (zv != NULL) 861 zv->zv_objset = os; 862 } else { 863 os = zv->zv_objset; 864 } 865 866 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 867 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0) 868 goto out; 869 870 error = zvol_update_volsize(os, volsize); 871 872 if (error == 0 && zv != NULL) 873 error = zvol_update_live_volsize(zv, volsize); 874 out: 875 if (owned) { 876 dmu_objset_disown(os, FTAG); 877 if (zv != NULL) 878 zv->zv_objset = NULL; 879 } 880 mutex_exit(&zfsdev_state_lock); 881 return (error); 882 } 883 884 /*ARGSUSED*/ 885 int 886 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 887 { 888 zvol_state_t *zv; 889 int err = 0; 890 891 mutex_enter(&zfsdev_state_lock); 892 893 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 894 if (zv == NULL) { 895 mutex_exit(&zfsdev_state_lock); 896 return (SET_ERROR(ENXIO)); 897 } 898 899 if (zv->zv_total_opens == 0) 900 err = zvol_first_open(zv); 901 if (err) { 902 mutex_exit(&zfsdev_state_lock); 903 return (err); 904 } 905 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 906 err = SET_ERROR(EROFS); 907 goto out; 908 } 909 if (zv->zv_flags & ZVOL_EXCL) { 910 err = SET_ERROR(EBUSY); 911 goto out; 912 } 913 if (flag & FEXCL) { 914 if (zv->zv_total_opens != 0) { 915 err = SET_ERROR(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(&zfsdev_state_lock); 926 927 return (err); 928 out: 929 if (zv->zv_total_opens == 0) 930 zvol_last_close(zv); 931 mutex_exit(&zfsdev_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 mutex_enter(&zfsdev_state_lock); 944 945 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 946 if (zv == NULL) { 947 mutex_exit(&zfsdev_state_lock); 948 return (SET_ERROR(ENXIO)); 949 } 950 951 if (zv->zv_flags & ZVOL_EXCL) { 952 ASSERT(zv->zv_total_opens == 1); 953 zv->zv_flags &= ~ZVOL_EXCL; 954 } 955 956 /* 957 * If the open count is zero, this is a spurious close. 958 * That indicates a bug in the kernel / DDI framework. 959 */ 960 ASSERT(zv->zv_open_count[otyp] != 0); 961 ASSERT(zv->zv_total_opens != 0); 962 963 /* 964 * You may get multiple opens, but only one close. 965 */ 966 zv->zv_open_count[otyp]--; 967 zv->zv_total_opens--; 968 969 if (zv->zv_total_opens == 0) 970 zvol_last_close(zv); 971 972 mutex_exit(&zfsdev_state_lock); 973 return (error); 974 } 975 976 static void 977 zvol_get_done(zgd_t *zgd, int error) 978 { 979 if (zgd->zgd_db) 980 dmu_buf_rele(zgd->zgd_db, zgd); 981 982 zfs_range_unlock(zgd->zgd_rl); 983 984 if (error == 0 && zgd->zgd_bp) 985 zil_lwb_add_block(zgd->zgd_lwb, zgd->zgd_bp); 986 987 kmem_free(zgd, sizeof (zgd_t)); 988 } 989 990 /* 991 * Get data to generate a TX_WRITE intent log record. 992 */ 993 static int 994 zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) 995 { 996 zvol_state_t *zv = arg; 997 uint64_t offset = lr->lr_offset; 998 uint64_t size = lr->lr_length; /* length of user data */ 999 dmu_buf_t *db; 1000 zgd_t *zgd; 1001 int error; 1002 1003 ASSERT3P(lwb, !=, NULL); 1004 ASSERT3P(zio, !=, NULL); 1005 ASSERT3U(size, !=, 0); 1006 1007 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1008 zgd->zgd_lwb = lwb; 1009 1010 /* 1011 * Write records come in two flavors: immediate and indirect. 1012 * For small writes it's cheaper to store the data with the 1013 * log record (immediate); for large writes it's cheaper to 1014 * sync the data and get a pointer to it (indirect) so that 1015 * we don't have to write the data twice. 1016 */ 1017 if (buf != NULL) { /* immediate write */ 1018 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, 1019 RL_READER); 1020 error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf, 1021 DMU_READ_NO_PREFETCH); 1022 } else { /* indirect write */ 1023 /* 1024 * Have to lock the whole block to ensure when it's written out 1025 * and its checksum is being calculated that no one can change 1026 * the data. Contrarily to zfs_get_data we need not re-check 1027 * blocksize after we get the lock because it cannot be changed. 1028 */ 1029 size = zv->zv_volblocksize; 1030 offset = P2ALIGN(offset, size); 1031 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, 1032 RL_READER); 1033 error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db, 1034 DMU_READ_NO_PREFETCH); 1035 if (error == 0) { 1036 blkptr_t *bp = &lr->lr_blkptr; 1037 1038 zgd->zgd_db = db; 1039 zgd->zgd_bp = bp; 1040 1041 ASSERT(db->db_offset == offset); 1042 ASSERT(db->db_size == size); 1043 1044 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1045 zvol_get_done, zgd); 1046 1047 if (error == 0) 1048 return (0); 1049 } 1050 } 1051 1052 zvol_get_done(zgd, error); 1053 1054 return (error); 1055 } 1056 1057 /* 1058 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 1059 * 1060 * We store data in the log buffers if it's small enough. 1061 * Otherwise we will later flush the data out via dmu_sync(). 1062 */ 1063 ssize_t zvol_immediate_write_sz = 32768; 1064 1065 static void 1066 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1067 boolean_t sync) 1068 { 1069 uint32_t blocksize = zv->zv_volblocksize; 1070 zilog_t *zilog = zv->zv_zilog; 1071 itx_wr_state_t write_state; 1072 1073 if (zil_replaying(zilog, tx)) 1074 return; 1075 1076 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1077 write_state = WR_INDIRECT; 1078 else if (!spa_has_slogs(zilog->zl_spa) && 1079 resid >= blocksize && blocksize > zvol_immediate_write_sz) 1080 write_state = WR_INDIRECT; 1081 else if (sync) 1082 write_state = WR_COPIED; 1083 else 1084 write_state = WR_NEED_COPY; 1085 1086 while (resid) { 1087 itx_t *itx; 1088 lr_write_t *lr; 1089 itx_wr_state_t wr_state = write_state; 1090 ssize_t len = resid; 1091 1092 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) 1093 wr_state = WR_NEED_COPY; 1094 else if (wr_state == WR_INDIRECT) 1095 len = MIN(blocksize - P2PHASE(off, blocksize), resid); 1096 1097 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1098 (wr_state == WR_COPIED ? len : 0)); 1099 lr = (lr_write_t *)&itx->itx_lr; 1100 if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn, 1101 off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1102 zil_itx_destroy(itx); 1103 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1104 lr = (lr_write_t *)&itx->itx_lr; 1105 wr_state = WR_NEED_COPY; 1106 } 1107 1108 itx->itx_wr_state = wr_state; 1109 lr->lr_foid = ZVOL_OBJ; 1110 lr->lr_offset = off; 1111 lr->lr_length = len; 1112 lr->lr_blkoff = 0; 1113 BP_ZERO(&lr->lr_blkptr); 1114 1115 itx->itx_private = zv; 1116 itx->itx_sync = sync; 1117 1118 zil_itx_assign(zilog, itx, tx); 1119 1120 off += len; 1121 resid -= len; 1122 } 1123 } 1124 1125 static int 1126 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset, 1127 uint64_t size, boolean_t doread, boolean_t isdump) 1128 { 1129 vdev_disk_t *dvd; 1130 int c; 1131 int numerrors = 0; 1132 1133 if (vd->vdev_ops == &vdev_mirror_ops || 1134 vd->vdev_ops == &vdev_replacing_ops || 1135 vd->vdev_ops == &vdev_spare_ops) { 1136 for (c = 0; c < vd->vdev_children; c++) { 1137 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1138 addr, offset, origoffset, size, doread, isdump); 1139 if (err != 0) { 1140 numerrors++; 1141 } else if (doread) { 1142 break; 1143 } 1144 } 1145 } 1146 1147 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops) 1148 return (numerrors < vd->vdev_children ? 0 : EIO); 1149 1150 if (doread && !vdev_readable(vd)) 1151 return (SET_ERROR(EIO)); 1152 else if (!doread && !vdev_writeable(vd)) 1153 return (SET_ERROR(EIO)); 1154 1155 if (vd->vdev_ops == &vdev_raidz_ops) { 1156 return (vdev_raidz_physio(vd, 1157 addr, size, offset, origoffset, doread, isdump)); 1158 } 1159 1160 offset += VDEV_LABEL_START_SIZE; 1161 1162 if (ddi_in_panic() || isdump) { 1163 ASSERT(!doread); 1164 if (doread) 1165 return (SET_ERROR(EIO)); 1166 dvd = vd->vdev_tsd; 1167 ASSERT3P(dvd, !=, NULL); 1168 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1169 lbtodb(size))); 1170 } else { 1171 dvd = vd->vdev_tsd; 1172 ASSERT3P(dvd, !=, NULL); 1173 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size, 1174 offset, doread ? B_READ : B_WRITE)); 1175 } 1176 } 1177 1178 static int 1179 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1180 boolean_t doread, boolean_t isdump) 1181 { 1182 vdev_t *vd; 1183 int error; 1184 zvol_extent_t *ze; 1185 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1186 1187 /* Must be sector aligned, and not stradle a block boundary. */ 1188 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1189 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1190 return (SET_ERROR(EINVAL)); 1191 } 1192 ASSERT(size <= zv->zv_volblocksize); 1193 1194 /* Locate the extent this belongs to */ 1195 ze = list_head(&zv->zv_extents); 1196 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1197 offset -= ze->ze_nblks * zv->zv_volblocksize; 1198 ze = list_next(&zv->zv_extents, ze); 1199 } 1200 1201 if (ze == NULL) 1202 return (SET_ERROR(EINVAL)); 1203 1204 if (!ddi_in_panic()) 1205 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1206 1207 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1208 offset += DVA_GET_OFFSET(&ze->ze_dva); 1209 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva), 1210 size, doread, isdump); 1211 1212 if (!ddi_in_panic()) 1213 spa_config_exit(spa, SCL_STATE, FTAG); 1214 1215 return (error); 1216 } 1217 1218 int 1219 zvol_strategy(buf_t *bp) 1220 { 1221 zfs_soft_state_t *zs = NULL; 1222 zvol_state_t *zv; 1223 uint64_t off, volsize; 1224 size_t resid; 1225 char *addr; 1226 objset_t *os; 1227 rl_t *rl; 1228 int error = 0; 1229 boolean_t doread = bp->b_flags & B_READ; 1230 boolean_t is_dumpified; 1231 boolean_t sync; 1232 1233 if (getminor(bp->b_edev) == 0) { 1234 error = SET_ERROR(EINVAL); 1235 } else { 1236 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1237 if (zs == NULL) 1238 error = SET_ERROR(ENXIO); 1239 else if (zs->zss_type != ZSST_ZVOL) 1240 error = SET_ERROR(EINVAL); 1241 } 1242 1243 if (error) { 1244 bioerror(bp, error); 1245 biodone(bp); 1246 return (0); 1247 } 1248 1249 zv = zs->zss_data; 1250 1251 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1252 bioerror(bp, EROFS); 1253 biodone(bp); 1254 return (0); 1255 } 1256 1257 off = ldbtob(bp->b_blkno); 1258 volsize = zv->zv_volsize; 1259 1260 os = zv->zv_objset; 1261 ASSERT(os != NULL); 1262 1263 bp_mapin(bp); 1264 addr = bp->b_un.b_addr; 1265 resid = bp->b_bcount; 1266 1267 if (resid > 0 && (off < 0 || off >= volsize)) { 1268 bioerror(bp, EIO); 1269 biodone(bp); 1270 return (0); 1271 } 1272 1273 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED; 1274 sync = ((!(bp->b_flags & B_ASYNC) && 1275 !(zv->zv_flags & ZVOL_WCE)) || 1276 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1277 !doread && !is_dumpified; 1278 1279 /* 1280 * There must be no buffer changes when doing a dmu_sync() because 1281 * we can't change the data whilst calculating the checksum. 1282 */ 1283 rl = zfs_range_lock(&zv->zv_znode, off, resid, 1284 doread ? RL_READER : RL_WRITER); 1285 1286 while (resid != 0 && off < volsize) { 1287 size_t size = MIN(resid, zvol_maxphys); 1288 if (is_dumpified) { 1289 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1290 error = zvol_dumpio(zv, addr, off, size, 1291 doread, B_FALSE); 1292 } else if (doread) { 1293 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1294 DMU_READ_PREFETCH); 1295 } else { 1296 dmu_tx_t *tx = dmu_tx_create(os); 1297 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1298 error = dmu_tx_assign(tx, TXG_WAIT); 1299 if (error) { 1300 dmu_tx_abort(tx); 1301 } else { 1302 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1303 zvol_log_write(zv, tx, off, size, sync); 1304 dmu_tx_commit(tx); 1305 } 1306 } 1307 if (error) { 1308 /* convert checksum errors into IO errors */ 1309 if (error == ECKSUM) 1310 error = SET_ERROR(EIO); 1311 break; 1312 } 1313 off += size; 1314 addr += size; 1315 resid -= size; 1316 } 1317 zfs_range_unlock(rl); 1318 1319 if ((bp->b_resid = resid) == bp->b_bcount) 1320 bioerror(bp, off > volsize ? EINVAL : error); 1321 1322 if (sync) 1323 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1324 biodone(bp); 1325 1326 return (0); 1327 } 1328 1329 /* 1330 * Set the buffer count to the zvol maximum transfer. 1331 * Using our own routine instead of the default minphys() 1332 * means that for larger writes we write bigger buffers on X86 1333 * (128K instead of 56K) and flush the disk write cache less often 1334 * (every zvol_maxphys - currently 1MB) instead of minphys (currently 1335 * 56K on X86 and 128K on sparc). 1336 */ 1337 void 1338 zvol_minphys(struct buf *bp) 1339 { 1340 if (bp->b_bcount > zvol_maxphys) 1341 bp->b_bcount = zvol_maxphys; 1342 } 1343 1344 int 1345 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1346 { 1347 minor_t minor = getminor(dev); 1348 zvol_state_t *zv; 1349 int error = 0; 1350 uint64_t size; 1351 uint64_t boff; 1352 uint64_t resid; 1353 1354 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1355 if (zv == NULL) 1356 return (SET_ERROR(ENXIO)); 1357 1358 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0) 1359 return (SET_ERROR(EINVAL)); 1360 1361 boff = ldbtob(blkno); 1362 resid = ldbtob(nblocks); 1363 1364 VERIFY3U(boff + resid, <=, zv->zv_volsize); 1365 1366 while (resid) { 1367 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 1368 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1369 if (error) 1370 break; 1371 boff += size; 1372 addr += size; 1373 resid -= size; 1374 } 1375 1376 return (error); 1377 } 1378 1379 /*ARGSUSED*/ 1380 int 1381 zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1382 { 1383 minor_t minor = getminor(dev); 1384 zvol_state_t *zv; 1385 uint64_t volsize; 1386 rl_t *rl; 1387 int error = 0; 1388 1389 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1390 if (zv == NULL) 1391 return (SET_ERROR(ENXIO)); 1392 1393 volsize = zv->zv_volsize; 1394 if (uio->uio_resid > 0 && 1395 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1396 return (SET_ERROR(EIO)); 1397 1398 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1399 error = physio(zvol_strategy, NULL, dev, B_READ, 1400 zvol_minphys, uio); 1401 return (error); 1402 } 1403 1404 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1405 RL_READER); 1406 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1407 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1408 1409 /* don't read past the end */ 1410 if (bytes > volsize - uio->uio_loffset) 1411 bytes = volsize - uio->uio_loffset; 1412 1413 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1414 if (error) { 1415 /* convert checksum errors into IO errors */ 1416 if (error == ECKSUM) 1417 error = SET_ERROR(EIO); 1418 break; 1419 } 1420 } 1421 zfs_range_unlock(rl); 1422 return (error); 1423 } 1424 1425 /*ARGSUSED*/ 1426 int 1427 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1428 { 1429 minor_t minor = getminor(dev); 1430 zvol_state_t *zv; 1431 uint64_t volsize; 1432 rl_t *rl; 1433 int error = 0; 1434 boolean_t sync; 1435 1436 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1437 if (zv == NULL) 1438 return (SET_ERROR(ENXIO)); 1439 1440 volsize = zv->zv_volsize; 1441 if (uio->uio_resid > 0 && 1442 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1443 return (SET_ERROR(EIO)); 1444 1445 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1446 error = physio(zvol_strategy, NULL, dev, B_WRITE, 1447 zvol_minphys, uio); 1448 return (error); 1449 } 1450 1451 sync = !(zv->zv_flags & ZVOL_WCE) || 1452 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1453 1454 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1455 RL_WRITER); 1456 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1457 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1458 uint64_t off = uio->uio_loffset; 1459 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1460 1461 if (bytes > volsize - off) /* don't write past the end */ 1462 bytes = volsize - off; 1463 1464 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1465 error = dmu_tx_assign(tx, TXG_WAIT); 1466 if (error) { 1467 dmu_tx_abort(tx); 1468 break; 1469 } 1470 error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx); 1471 if (error == 0) 1472 zvol_log_write(zv, tx, off, bytes, sync); 1473 dmu_tx_commit(tx); 1474 1475 if (error) 1476 break; 1477 } 1478 zfs_range_unlock(rl); 1479 if (sync) 1480 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1481 return (error); 1482 } 1483 1484 int 1485 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1486 { 1487 struct uuid uuid = EFI_RESERVED; 1488 efi_gpe_t gpe = { 0 }; 1489 uint32_t crc; 1490 dk_efi_t efi; 1491 int length; 1492 char *ptr; 1493 1494 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1495 return (SET_ERROR(EFAULT)); 1496 ptr = (char *)(uintptr_t)efi.dki_data_64; 1497 length = efi.dki_length; 1498 /* 1499 * Some clients may attempt to request a PMBR for the 1500 * zvol. Currently this interface will return EINVAL to 1501 * such requests. These requests could be supported by 1502 * adding a check for lba == 0 and consing up an appropriate 1503 * PMBR. 1504 */ 1505 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1506 return (SET_ERROR(EINVAL)); 1507 1508 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1509 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1510 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1511 1512 if (efi.dki_lba == 1) { 1513 efi_gpt_t gpt = { 0 }; 1514 1515 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1516 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1517 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1518 gpt.efi_gpt_MyLBA = LE_64(1ULL); 1519 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1520 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1521 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1522 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1523 gpt.efi_gpt_SizeOfPartitionEntry = 1524 LE_32(sizeof (efi_gpe_t)); 1525 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1526 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1527 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1528 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1529 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1530 flag)) 1531 return (SET_ERROR(EFAULT)); 1532 ptr += sizeof (gpt); 1533 length -= sizeof (gpt); 1534 } 1535 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1536 length), flag)) 1537 return (SET_ERROR(EFAULT)); 1538 return (0); 1539 } 1540 1541 /* 1542 * BEGIN entry points to allow external callers access to the volume. 1543 */ 1544 /* 1545 * Return the volume parameters needed for access from an external caller. 1546 * These values are invariant as long as the volume is held open. 1547 */ 1548 int 1549 zvol_get_volume_params(minor_t minor, uint64_t *blksize, 1550 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 1551 void **rl_hdl, void **dnode_hdl) 1552 { 1553 zvol_state_t *zv; 1554 1555 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1556 if (zv == NULL) 1557 return (SET_ERROR(ENXIO)); 1558 if (zv->zv_flags & ZVOL_DUMPIFIED) 1559 return (SET_ERROR(ENXIO)); 1560 1561 ASSERT(blksize && max_xfer_len && minor_hdl && 1562 objset_hdl && zil_hdl && rl_hdl && dnode_hdl); 1563 1564 *blksize = zv->zv_volblocksize; 1565 *max_xfer_len = (uint64_t)zvol_maxphys; 1566 *minor_hdl = zv; 1567 *objset_hdl = zv->zv_objset; 1568 *zil_hdl = zv->zv_zilog; 1569 *rl_hdl = &zv->zv_znode; 1570 *dnode_hdl = zv->zv_dn; 1571 return (0); 1572 } 1573 1574 /* 1575 * Return the current volume size to an external caller. 1576 * The size can change while the volume is open. 1577 */ 1578 uint64_t 1579 zvol_get_volume_size(void *minor_hdl) 1580 { 1581 zvol_state_t *zv = minor_hdl; 1582 1583 return (zv->zv_volsize); 1584 } 1585 1586 /* 1587 * Return the current WCE setting to an external caller. 1588 * The WCE setting can change while the volume is open. 1589 */ 1590 int 1591 zvol_get_volume_wce(void *minor_hdl) 1592 { 1593 zvol_state_t *zv = minor_hdl; 1594 1595 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 1596 } 1597 1598 /* 1599 * Entry point for external callers to zvol_log_write 1600 */ 1601 void 1602 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 1603 boolean_t sync) 1604 { 1605 zvol_state_t *zv = minor_hdl; 1606 1607 zvol_log_write(zv, tx, off, resid, sync); 1608 } 1609 /* 1610 * END entry points to allow external callers access to the volume. 1611 */ 1612 1613 /* 1614 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 1615 */ 1616 static void 1617 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 1618 boolean_t sync) 1619 { 1620 itx_t *itx; 1621 lr_truncate_t *lr; 1622 zilog_t *zilog = zv->zv_zilog; 1623 1624 if (zil_replaying(zilog, tx)) 1625 return; 1626 1627 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 1628 lr = (lr_truncate_t *)&itx->itx_lr; 1629 lr->lr_foid = ZVOL_OBJ; 1630 lr->lr_offset = off; 1631 lr->lr_length = len; 1632 1633 itx->itx_sync = sync; 1634 zil_itx_assign(zilog, itx, tx); 1635 } 1636 1637 /* 1638 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1639 * Also a dirtbag dkio ioctl for unmap/free-block functionality. 1640 */ 1641 /*ARGSUSED*/ 1642 int 1643 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1644 { 1645 zvol_state_t *zv; 1646 struct dk_callback *dkc; 1647 int error = 0; 1648 rl_t *rl; 1649 1650 mutex_enter(&zfsdev_state_lock); 1651 1652 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1653 1654 if (zv == NULL) { 1655 mutex_exit(&zfsdev_state_lock); 1656 return (SET_ERROR(ENXIO)); 1657 } 1658 ASSERT(zv->zv_total_opens > 0); 1659 1660 switch (cmd) { 1661 1662 case DKIOCINFO: 1663 { 1664 struct dk_cinfo dki; 1665 1666 bzero(&dki, sizeof (dki)); 1667 (void) strcpy(dki.dki_cname, "zvol"); 1668 (void) strcpy(dki.dki_dname, "zvol"); 1669 dki.dki_ctype = DKC_UNKNOWN; 1670 dki.dki_unit = getminor(dev); 1671 dki.dki_maxtransfer = 1672 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs); 1673 mutex_exit(&zfsdev_state_lock); 1674 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1675 error = SET_ERROR(EFAULT); 1676 return (error); 1677 } 1678 1679 case DKIOCGMEDIAINFO: 1680 { 1681 struct dk_minfo dkm; 1682 1683 bzero(&dkm, sizeof (dkm)); 1684 dkm.dki_lbsize = 1U << zv->zv_min_bs; 1685 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1686 dkm.dki_media_type = DK_UNKNOWN; 1687 mutex_exit(&zfsdev_state_lock); 1688 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1689 error = SET_ERROR(EFAULT); 1690 return (error); 1691 } 1692 1693 case DKIOCGMEDIAINFOEXT: 1694 { 1695 struct dk_minfo_ext dkmext; 1696 1697 bzero(&dkmext, sizeof (dkmext)); 1698 dkmext.dki_lbsize = 1U << zv->zv_min_bs; 1699 dkmext.dki_pbsize = zv->zv_volblocksize; 1700 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1701 dkmext.dki_media_type = DK_UNKNOWN; 1702 mutex_exit(&zfsdev_state_lock); 1703 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag)) 1704 error = SET_ERROR(EFAULT); 1705 return (error); 1706 } 1707 1708 case DKIOCGETEFI: 1709 { 1710 uint64_t vs = zv->zv_volsize; 1711 uint8_t bs = zv->zv_min_bs; 1712 1713 mutex_exit(&zfsdev_state_lock); 1714 error = zvol_getefi((void *)arg, flag, vs, bs); 1715 return (error); 1716 } 1717 1718 case DKIOCFLUSHWRITECACHE: 1719 dkc = (struct dk_callback *)arg; 1720 mutex_exit(&zfsdev_state_lock); 1721 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1722 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1723 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1724 error = 0; 1725 } 1726 return (error); 1727 1728 case DKIOCGETWCE: 1729 { 1730 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1731 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1732 flag)) 1733 error = SET_ERROR(EFAULT); 1734 break; 1735 } 1736 case DKIOCSETWCE: 1737 { 1738 int wce; 1739 if (ddi_copyin((void *)arg, &wce, sizeof (int), 1740 flag)) { 1741 error = SET_ERROR(EFAULT); 1742 break; 1743 } 1744 if (wce) { 1745 zv->zv_flags |= ZVOL_WCE; 1746 mutex_exit(&zfsdev_state_lock); 1747 } else { 1748 zv->zv_flags &= ~ZVOL_WCE; 1749 mutex_exit(&zfsdev_state_lock); 1750 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1751 } 1752 return (0); 1753 } 1754 1755 case DKIOCGGEOM: 1756 case DKIOCGVTOC: 1757 /* 1758 * commands using these (like prtvtoc) expect ENOTSUP 1759 * since we're emulating an EFI label 1760 */ 1761 error = SET_ERROR(ENOTSUP); 1762 break; 1763 1764 case DKIOCDUMPINIT: 1765 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1766 RL_WRITER); 1767 error = zvol_dumpify(zv); 1768 zfs_range_unlock(rl); 1769 break; 1770 1771 case DKIOCDUMPFINI: 1772 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 1773 break; 1774 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1775 RL_WRITER); 1776 error = zvol_dump_fini(zv); 1777 zfs_range_unlock(rl); 1778 break; 1779 1780 case DKIOCFREE: 1781 { 1782 dkioc_free_list_t *dfl; 1783 dmu_tx_t *tx; 1784 1785 if (!zvol_unmap_enabled) 1786 break; 1787 1788 if (!(flag & FKIOCTL)) { 1789 error = dfl_copyin((void *)arg, &dfl, flag, KM_SLEEP); 1790 if (error != 0) 1791 break; 1792 } else { 1793 dfl = (dkioc_free_list_t *)arg; 1794 ASSERT3U(dfl->dfl_num_exts, <=, DFL_COPYIN_MAX_EXTS); 1795 if (dfl->dfl_num_exts > DFL_COPYIN_MAX_EXTS) { 1796 error = SET_ERROR(EINVAL); 1797 break; 1798 } 1799 } 1800 1801 mutex_exit(&zfsdev_state_lock); 1802 1803 for (int i = 0; i < dfl->dfl_num_exts; i++) { 1804 uint64_t start = dfl->dfl_exts[i].dfle_start, 1805 length = dfl->dfl_exts[i].dfle_length, 1806 end = start + length; 1807 1808 /* 1809 * Apply Postel's Law to length-checking. If they 1810 * overshoot, just blank out until the end, if there's 1811 * a need to blank out anything. 1812 */ 1813 if (start >= zv->zv_volsize) 1814 continue; /* No need to do anything... */ 1815 if (end > zv->zv_volsize) { 1816 end = DMU_OBJECT_END; 1817 length = end - start; 1818 } 1819 1820 rl = zfs_range_lock(&zv->zv_znode, start, length, 1821 RL_WRITER); 1822 tx = dmu_tx_create(zv->zv_objset); 1823 error = dmu_tx_assign(tx, TXG_WAIT); 1824 if (error != 0) { 1825 dmu_tx_abort(tx); 1826 } else { 1827 zvol_log_truncate(zv, tx, start, length, 1828 B_TRUE); 1829 dmu_tx_commit(tx); 1830 error = dmu_free_long_range(zv->zv_objset, 1831 ZVOL_OBJ, start, length); 1832 } 1833 1834 zfs_range_unlock(rl); 1835 1836 if (error != 0) 1837 break; 1838 } 1839 1840 /* 1841 * If the write-cache is disabled, 'sync' property 1842 * is set to 'always', or if the caller is asking for 1843 * a synchronous free, commit this operation to the zil. 1844 * This will sync any previous uncommitted writes to the 1845 * zvol object. 1846 * Can be overridden by the zvol_unmap_sync_enabled tunable. 1847 */ 1848 if ((error == 0) && zvol_unmap_sync_enabled && 1849 (!(zv->zv_flags & ZVOL_WCE) || 1850 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) || 1851 (dfl->dfl_flags & DF_WAIT_SYNC))) { 1852 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1853 } 1854 1855 if (!(flag & FKIOCTL)) 1856 dfl_free(dfl); 1857 1858 return (error); 1859 } 1860 1861 default: 1862 error = SET_ERROR(ENOTTY); 1863 break; 1864 1865 } 1866 mutex_exit(&zfsdev_state_lock); 1867 return (error); 1868 } 1869 1870 int 1871 zvol_busy(void) 1872 { 1873 return (zvol_minors != 0); 1874 } 1875 1876 void 1877 zvol_init(void) 1878 { 1879 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1880 1) == 0); 1881 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1882 } 1883 1884 void 1885 zvol_fini(void) 1886 { 1887 mutex_destroy(&zfsdev_state_lock); 1888 ddi_soft_state_fini(&zfsdev_state); 1889 } 1890 1891 /*ARGSUSED*/ 1892 static int 1893 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx) 1894 { 1895 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1896 1897 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1898 return (1); 1899 return (0); 1900 } 1901 1902 /*ARGSUSED*/ 1903 static void 1904 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx) 1905 { 1906 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1907 1908 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx); 1909 } 1910 1911 static int 1912 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1913 { 1914 dmu_tx_t *tx; 1915 int error; 1916 objset_t *os = zv->zv_objset; 1917 spa_t *spa = dmu_objset_spa(os); 1918 vdev_t *vd = spa->spa_root_vdev; 1919 nvlist_t *nv = NULL; 1920 uint64_t version = spa_version(spa); 1921 uint64_t checksum, compress, refresrv, vbs, dedup; 1922 1923 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1924 ASSERT(vd->vdev_ops == &vdev_root_ops); 1925 1926 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1927 DMU_OBJECT_END); 1928 if (error != 0) 1929 return (error); 1930 /* wait for dmu_free_long_range to actually free the blocks */ 1931 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1932 1933 /* 1934 * If the pool on which the dump device is being initialized has more 1935 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is 1936 * enabled. If so, bump that feature's counter to indicate that the 1937 * feature is active. We also check the vdev type to handle the 1938 * following case: 1939 * # zpool create test raidz disk1 disk2 disk3 1940 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev), 1941 * the raidz vdev itself has 3 children. 1942 */ 1943 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) { 1944 if (!spa_feature_is_enabled(spa, 1945 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1946 return (SET_ERROR(ENOTSUP)); 1947 (void) dsl_sync_task(spa_name(spa), 1948 zfs_mvdev_dump_feature_check, 1949 zfs_mvdev_dump_activate_feature_sync, NULL, 1950 2, ZFS_SPACE_CHECK_RESERVED); 1951 } 1952 1953 if (!resize) { 1954 error = dsl_prop_get_integer(zv->zv_name, 1955 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1956 if (error == 0) { 1957 error = dsl_prop_get_integer(zv->zv_name, 1958 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, 1959 NULL); 1960 } 1961 if (error == 0) { 1962 error = dsl_prop_get_integer(zv->zv_name, 1963 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 1964 &refresrv, NULL); 1965 } 1966 if (error == 0) { 1967 error = dsl_prop_get_integer(zv->zv_name, 1968 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, 1969 NULL); 1970 } 1971 if (version >= SPA_VERSION_DEDUP && error == 0) { 1972 error = dsl_prop_get_integer(zv->zv_name, 1973 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 1974 } 1975 } 1976 if (error != 0) 1977 return (error); 1978 1979 tx = dmu_tx_create(os); 1980 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1981 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1982 error = dmu_tx_assign(tx, TXG_WAIT); 1983 if (error != 0) { 1984 dmu_tx_abort(tx); 1985 return (error); 1986 } 1987 1988 /* 1989 * If we are resizing the dump device then we only need to 1990 * update the refreservation to match the newly updated 1991 * zvolsize. Otherwise, we save off the original state of the 1992 * zvol so that we can restore them if the zvol is ever undumpified. 1993 */ 1994 if (resize) { 1995 error = zap_update(os, ZVOL_ZAP_OBJ, 1996 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1997 &zv->zv_volsize, tx); 1998 } else { 1999 error = zap_update(os, ZVOL_ZAP_OBJ, 2000 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 2001 &compress, tx); 2002 if (error == 0) { 2003 error = zap_update(os, ZVOL_ZAP_OBJ, 2004 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, 2005 &checksum, tx); 2006 } 2007 if (error == 0) { 2008 error = zap_update(os, ZVOL_ZAP_OBJ, 2009 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2010 &refresrv, tx); 2011 } 2012 if (error == 0) { 2013 error = zap_update(os, ZVOL_ZAP_OBJ, 2014 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 2015 &vbs, tx); 2016 } 2017 if (error == 0) { 2018 error = dmu_object_set_blocksize( 2019 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx); 2020 } 2021 if (version >= SPA_VERSION_DEDUP && error == 0) { 2022 error = zap_update(os, ZVOL_ZAP_OBJ, 2023 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 2024 &dedup, tx); 2025 } 2026 if (error == 0) 2027 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE; 2028 } 2029 dmu_tx_commit(tx); 2030 2031 /* 2032 * We only need update the zvol's property if we are initializing 2033 * the dump area for the first time. 2034 */ 2035 if (error == 0 && !resize) { 2036 /* 2037 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum 2038 * function. Otherwise, use the old default -- OFF. 2039 */ 2040 checksum = spa_feature_is_active(spa, 2041 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY : 2042 ZIO_CHECKSUM_OFF; 2043 2044 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2045 VERIFY(nvlist_add_uint64(nv, 2046 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 2047 VERIFY(nvlist_add_uint64(nv, 2048 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 2049 ZIO_COMPRESS_OFF) == 0); 2050 VERIFY(nvlist_add_uint64(nv, 2051 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 2052 checksum) == 0); 2053 if (version >= SPA_VERSION_DEDUP) { 2054 VERIFY(nvlist_add_uint64(nv, 2055 zfs_prop_to_name(ZFS_PROP_DEDUP), 2056 ZIO_CHECKSUM_OFF) == 0); 2057 } 2058 2059 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2060 nv, NULL); 2061 nvlist_free(nv); 2062 } 2063 2064 /* Allocate the space for the dump */ 2065 if (error == 0) 2066 error = zvol_prealloc(zv); 2067 return (error); 2068 } 2069 2070 static int 2071 zvol_dumpify(zvol_state_t *zv) 2072 { 2073 int error = 0; 2074 uint64_t dumpsize = 0; 2075 dmu_tx_t *tx; 2076 objset_t *os = zv->zv_objset; 2077 2078 if (zv->zv_flags & ZVOL_RDONLY) 2079 return (SET_ERROR(EROFS)); 2080 2081 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 2082 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 2083 boolean_t resize = (dumpsize > 0); 2084 2085 if ((error = zvol_dump_init(zv, resize)) != 0) { 2086 (void) zvol_dump_fini(zv); 2087 return (error); 2088 } 2089 } 2090 2091 /* 2092 * Build up our lba mapping. 2093 */ 2094 error = zvol_get_lbas(zv); 2095 if (error) { 2096 (void) zvol_dump_fini(zv); 2097 return (error); 2098 } 2099 2100 tx = dmu_tx_create(os); 2101 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2102 error = dmu_tx_assign(tx, TXG_WAIT); 2103 if (error) { 2104 dmu_tx_abort(tx); 2105 (void) zvol_dump_fini(zv); 2106 return (error); 2107 } 2108 2109 zv->zv_flags |= ZVOL_DUMPIFIED; 2110 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 2111 &zv->zv_volsize, tx); 2112 dmu_tx_commit(tx); 2113 2114 if (error) { 2115 (void) zvol_dump_fini(zv); 2116 return (error); 2117 } 2118 2119 txg_wait_synced(dmu_objset_pool(os), 0); 2120 return (0); 2121 } 2122 2123 static int 2124 zvol_dump_fini(zvol_state_t *zv) 2125 { 2126 dmu_tx_t *tx; 2127 objset_t *os = zv->zv_objset; 2128 nvlist_t *nv; 2129 int error = 0; 2130 uint64_t checksum, compress, refresrv, vbs, dedup; 2131 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 2132 2133 /* 2134 * Attempt to restore the zvol back to its pre-dumpified state. 2135 * This is a best-effort attempt as it's possible that not all 2136 * of these properties were initialized during the dumpify process 2137 * (i.e. error during zvol_dump_init). 2138 */ 2139 2140 tx = dmu_tx_create(os); 2141 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2142 error = dmu_tx_assign(tx, TXG_WAIT); 2143 if (error) { 2144 dmu_tx_abort(tx); 2145 return (error); 2146 } 2147 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 2148 dmu_tx_commit(tx); 2149 2150 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2151 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 2152 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2153 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 2154 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2155 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 2156 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2157 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 2158 2159 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2160 (void) nvlist_add_uint64(nv, 2161 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 2162 (void) nvlist_add_uint64(nv, 2163 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 2164 (void) nvlist_add_uint64(nv, 2165 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 2166 if (version >= SPA_VERSION_DEDUP && 2167 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2168 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 2169 (void) nvlist_add_uint64(nv, 2170 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 2171 } 2172 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2173 nv, NULL); 2174 nvlist_free(nv); 2175 2176 zvol_free_extents(zv); 2177 zv->zv_flags &= ~ZVOL_DUMPIFIED; 2178 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2179 /* wait for dmu_free_long_range to actually free the blocks */ 2180 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2181 tx = dmu_tx_create(os); 2182 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2183 error = dmu_tx_assign(tx, TXG_WAIT); 2184 if (error) { 2185 dmu_tx_abort(tx); 2186 return (error); 2187 } 2188 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2189 zv->zv_volblocksize = vbs; 2190 dmu_tx_commit(tx); 2191 2192 return (0); 2193 } 2194