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) 2014 Integros [integros.com] 29 * Copyright 2019 Joyent, Inc. 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/smt.h> 93 #include <sys/dkioc_free_util.h> 94 #include <sys/zfs_rlock.h> 95 96 #include "zfs_namecheck.h" 97 98 void *zfsdev_state; 99 static char *zvol_tag = "zvol_tag"; 100 101 #define ZVOL_DUMPSIZE "dumpsize" 102 103 /* 104 * This lock protects the zfsdev_state structure from being modified 105 * while it's being used, e.g. an open that comes in before a create 106 * finishes. It also protects temporary opens of the dataset so that, 107 * e.g., an open doesn't get a spurious EBUSY. 108 */ 109 kmutex_t zfsdev_state_lock; 110 static uint32_t zvol_minors; 111 112 typedef struct zvol_extent { 113 list_node_t ze_node; 114 dva_t ze_dva; /* dva associated with this extent */ 115 uint64_t ze_nblks; /* number of blocks in extent */ 116 } zvol_extent_t; 117 118 /* 119 * The in-core state of each volume. 120 */ 121 typedef struct zvol_state { 122 char zv_name[MAXPATHLEN]; /* pool/dd name */ 123 uint64_t zv_volsize; /* amount of space we advertise */ 124 uint64_t zv_volblocksize; /* volume block size */ 125 minor_t zv_minor; /* minor number */ 126 uint8_t zv_min_bs; /* minimum addressable block shift */ 127 uint8_t zv_flags; /* readonly, dumpified, etc. */ 128 objset_t *zv_objset; /* objset handle */ 129 uint32_t zv_open_count[OTYPCNT]; /* open counts */ 130 uint32_t zv_total_opens; /* total open count */ 131 zilog_t *zv_zilog; /* ZIL handle */ 132 list_t zv_extents; /* List of extents for dump */ 133 rangelock_t zv_rangelock; 134 dnode_t *zv_dn; /* dnode hold */ 135 } zvol_state_t; 136 137 /* 138 * zvol specific flags 139 */ 140 #define ZVOL_RDONLY 0x1 141 #define ZVOL_DUMPIFIED 0x2 142 #define ZVOL_EXCL 0x4 143 #define ZVOL_WCE 0x8 144 145 /* 146 * zvol maximum transfer in one DMU tx. 147 */ 148 int zvol_maxphys = DMU_MAX_ACCESS/2; 149 150 /* 151 * Toggle unmap functionality. 152 */ 153 boolean_t zvol_unmap_enabled = B_TRUE; 154 155 /* 156 * If true, unmaps requested as synchronous are executed synchronously, 157 * otherwise all unmaps are asynchronous. 158 */ 159 boolean_t zvol_unmap_sync_enabled = B_FALSE; 160 161 extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 162 nvlist_t *, nvlist_t *); 163 static int zvol_remove_zv(zvol_state_t *); 164 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, 165 struct lwb *lwb, zio_t *zio); 166 static int zvol_dumpify(zvol_state_t *zv); 167 static int zvol_dump_fini(zvol_state_t *zv); 168 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 169 170 static void 171 zvol_size_changed(zvol_state_t *zv, uint64_t volsize) 172 { 173 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor); 174 175 zv->zv_volsize = volsize; 176 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 177 "Size", volsize) == DDI_SUCCESS); 178 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 179 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 180 181 /* Notify specfs to invalidate the cached size */ 182 spec_size_invalidate(dev, VBLK); 183 spec_size_invalidate(dev, VCHR); 184 } 185 186 int 187 zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 188 { 189 if (volsize == 0) 190 return (SET_ERROR(EINVAL)); 191 192 if (volsize % blocksize != 0) 193 return (SET_ERROR(EINVAL)); 194 195 #ifdef _ILP32 196 if (volsize - 1 > SPEC_MAXOFFSET_T) 197 return (SET_ERROR(EOVERFLOW)); 198 #endif 199 return (0); 200 } 201 202 int 203 zvol_check_volblocksize(uint64_t volblocksize) 204 { 205 if (volblocksize < SPA_MINBLOCKSIZE || 206 volblocksize > SPA_OLD_MAXBLOCKSIZE || 207 !ISP2(volblocksize)) 208 return (SET_ERROR(EDOM)); 209 210 return (0); 211 } 212 213 int 214 zvol_get_stats(objset_t *os, nvlist_t *nv) 215 { 216 int error; 217 dmu_object_info_t doi; 218 uint64_t val; 219 220 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 221 if (error) 222 return (error); 223 224 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 225 226 error = dmu_object_info(os, ZVOL_OBJ, &doi); 227 228 if (error == 0) { 229 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 230 doi.doi_data_block_size); 231 } 232 233 return (error); 234 } 235 236 static zvol_state_t * 237 zvol_minor_lookup(const char *name) 238 { 239 minor_t minor; 240 zvol_state_t *zv; 241 242 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 243 244 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 245 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 246 if (zv == NULL) 247 continue; 248 if (strcmp(zv->zv_name, name) == 0) 249 return (zv); 250 } 251 252 return (NULL); 253 } 254 255 /* extent mapping arg */ 256 struct maparg { 257 zvol_state_t *ma_zv; 258 uint64_t ma_blks; 259 }; 260 261 /*ARGSUSED*/ 262 static int 263 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 264 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 265 { 266 struct maparg *ma = arg; 267 zvol_extent_t *ze; 268 int bs = ma->ma_zv->zv_volblocksize; 269 270 if (bp == NULL || BP_IS_HOLE(bp) || 271 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 272 return (0); 273 274 VERIFY(!BP_IS_EMBEDDED(bp)); 275 276 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 277 ma->ma_blks++; 278 279 /* Abort immediately if we have encountered gang blocks */ 280 if (BP_IS_GANG(bp)) 281 return (SET_ERROR(EFRAGS)); 282 283 /* 284 * See if the block is at the end of the previous extent. 285 */ 286 ze = list_tail(&ma->ma_zv->zv_extents); 287 if (ze && 288 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 289 DVA_GET_OFFSET(BP_IDENTITY(bp)) == 290 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 291 ze->ze_nblks++; 292 return (0); 293 } 294 295 dprintf_bp(bp, "%s", "next blkptr:"); 296 297 /* start a new extent */ 298 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 299 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 300 ze->ze_nblks = 1; 301 list_insert_tail(&ma->ma_zv->zv_extents, ze); 302 return (0); 303 } 304 305 static void 306 zvol_free_extents(zvol_state_t *zv) 307 { 308 zvol_extent_t *ze; 309 310 while (ze = list_head(&zv->zv_extents)) { 311 list_remove(&zv->zv_extents, ze); 312 kmem_free(ze, sizeof (zvol_extent_t)); 313 } 314 } 315 316 static int 317 zvol_get_lbas(zvol_state_t *zv) 318 { 319 objset_t *os = zv->zv_objset; 320 struct maparg ma; 321 int err; 322 323 ma.ma_zv = zv; 324 ma.ma_blks = 0; 325 zvol_free_extents(zv); 326 327 /* commit any in-flight changes before traversing the dataset */ 328 txg_wait_synced(dmu_objset_pool(os), 0); 329 err = traverse_dataset(dmu_objset_ds(os), 0, 330 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 331 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 332 zvol_free_extents(zv); 333 return (err ? err : EIO); 334 } 335 336 return (0); 337 } 338 339 /* ARGSUSED */ 340 void 341 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 342 { 343 zfs_creat_t *zct = arg; 344 nvlist_t *nvprops = zct->zct_props; 345 int error; 346 uint64_t volblocksize, volsize; 347 348 VERIFY(nvlist_lookup_uint64(nvprops, 349 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 350 if (nvlist_lookup_uint64(nvprops, 351 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 352 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 353 354 /* 355 * These properties must be removed from the list so the generic 356 * property setting step won't apply to them. 357 */ 358 VERIFY(nvlist_remove_all(nvprops, 359 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 360 (void) nvlist_remove_all(nvprops, 361 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 362 363 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 364 DMU_OT_NONE, 0, tx); 365 ASSERT(error == 0); 366 367 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 368 DMU_OT_NONE, 0, tx); 369 ASSERT(error == 0); 370 371 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 372 ASSERT(error == 0); 373 } 374 375 /* 376 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 377 * implement DKIOCFREE/free-long-range. 378 */ 379 static int 380 zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap) 381 { 382 zvol_state_t *zv = arg1; 383 lr_truncate_t *lr = arg2; 384 uint64_t offset, length; 385 386 if (byteswap) 387 byteswap_uint64_array(lr, sizeof (*lr)); 388 389 offset = lr->lr_offset; 390 length = lr->lr_length; 391 392 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 393 } 394 395 /* 396 * Replay a TX_WRITE ZIL transaction that didn't get committed 397 * after a system failure 398 */ 399 static int 400 zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap) 401 { 402 zvol_state_t *zv = arg1; 403 lr_write_t *lr = arg2; 404 objset_t *os = zv->zv_objset; 405 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 406 uint64_t offset, length; 407 dmu_tx_t *tx; 408 int error; 409 410 if (byteswap) 411 byteswap_uint64_array(lr, sizeof (*lr)); 412 413 offset = lr->lr_offset; 414 length = lr->lr_length; 415 416 /* If it's a dmu_sync() block, write the whole block */ 417 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 418 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 419 if (length < blocksize) { 420 offset -= offset % blocksize; 421 length = blocksize; 422 } 423 } 424 425 tx = dmu_tx_create(os); 426 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 427 error = dmu_tx_assign(tx, TXG_WAIT); 428 if (error) { 429 dmu_tx_abort(tx); 430 } else { 431 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 432 dmu_tx_commit(tx); 433 } 434 435 return (error); 436 } 437 438 /* ARGSUSED */ 439 static int 440 zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap) 441 { 442 return (SET_ERROR(ENOTSUP)); 443 } 444 445 /* 446 * Callback vectors for replaying records. 447 * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 448 */ 449 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 450 zvol_replay_err, /* 0 no such transaction type */ 451 zvol_replay_err, /* TX_CREATE */ 452 zvol_replay_err, /* TX_MKDIR */ 453 zvol_replay_err, /* TX_MKXATTR */ 454 zvol_replay_err, /* TX_SYMLINK */ 455 zvol_replay_err, /* TX_REMOVE */ 456 zvol_replay_err, /* TX_RMDIR */ 457 zvol_replay_err, /* TX_LINK */ 458 zvol_replay_err, /* TX_RENAME */ 459 zvol_replay_write, /* TX_WRITE */ 460 zvol_replay_truncate, /* TX_TRUNCATE */ 461 zvol_replay_err, /* TX_SETATTR */ 462 zvol_replay_err, /* TX_ACL */ 463 zvol_replay_err, /* TX_CREATE_ACL */ 464 zvol_replay_err, /* TX_CREATE_ATTR */ 465 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 466 zvol_replay_err, /* TX_MKDIR_ACL */ 467 zvol_replay_err, /* TX_MKDIR_ATTR */ 468 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 469 zvol_replay_err, /* TX_WRITE2 */ 470 }; 471 472 int 473 zvol_name2minor(const char *name, minor_t *minor) 474 { 475 zvol_state_t *zv; 476 477 mutex_enter(&zfsdev_state_lock); 478 zv = zvol_minor_lookup(name); 479 if (minor && zv) 480 *minor = zv->zv_minor; 481 mutex_exit(&zfsdev_state_lock); 482 return (zv ? 0 : -1); 483 } 484 485 /* 486 * Create a minor node (plus a whole lot more) for the specified volume. 487 */ 488 int 489 zvol_create_minor(const char *name) 490 { 491 zfs_soft_state_t *zs; 492 zvol_state_t *zv; 493 objset_t *os; 494 dmu_object_info_t doi; 495 minor_t minor = 0; 496 char chrbuf[30], blkbuf[30]; 497 int error; 498 499 mutex_enter(&zfsdev_state_lock); 500 501 if (zvol_minor_lookup(name) != NULL) { 502 mutex_exit(&zfsdev_state_lock); 503 return (SET_ERROR(EEXIST)); 504 } 505 506 /* lie and say we're read-only */ 507 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); 508 509 if (error) { 510 mutex_exit(&zfsdev_state_lock); 511 return (error); 512 } 513 514 if ((minor = zfsdev_minor_alloc()) == 0) { 515 dmu_objset_disown(os, FTAG); 516 mutex_exit(&zfsdev_state_lock); 517 return (SET_ERROR(ENXIO)); 518 } 519 520 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 521 dmu_objset_disown(os, FTAG); 522 mutex_exit(&zfsdev_state_lock); 523 return (SET_ERROR(EAGAIN)); 524 } 525 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 526 (char *)name); 527 528 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 529 530 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 531 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 532 ddi_soft_state_free(zfsdev_state, minor); 533 dmu_objset_disown(os, FTAG); 534 mutex_exit(&zfsdev_state_lock); 535 return (SET_ERROR(EAGAIN)); 536 } 537 538 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 539 540 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 541 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 542 ddi_remove_minor_node(zfs_dip, chrbuf); 543 ddi_soft_state_free(zfsdev_state, minor); 544 dmu_objset_disown(os, FTAG); 545 mutex_exit(&zfsdev_state_lock); 546 return (SET_ERROR(EAGAIN)); 547 } 548 549 zs = ddi_get_soft_state(zfsdev_state, minor); 550 zs->zss_type = ZSST_ZVOL; 551 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 552 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 553 zv->zv_min_bs = DEV_BSHIFT; 554 zv->zv_minor = minor; 555 zv->zv_objset = os; 556 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 557 zv->zv_flags |= ZVOL_RDONLY; 558 rangelock_init(&zv->zv_rangelock, NULL, NULL); 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 rangelock_fini(&zv->zv_rangelock); 602 603 kmem_free(zv, sizeof (zvol_state_t)); 604 605 ddi_soft_state_free(zfsdev_state, minor); 606 607 zvol_minors--; 608 return (0); 609 } 610 611 int 612 zvol_remove_minor(const char *name) 613 { 614 zvol_state_t *zv; 615 int rc; 616 617 mutex_enter(&zfsdev_state_lock); 618 if ((zv = zvol_minor_lookup(name)) == NULL) { 619 mutex_exit(&zfsdev_state_lock); 620 return (SET_ERROR(ENXIO)); 621 } 622 rc = zvol_remove_zv(zv); 623 mutex_exit(&zfsdev_state_lock); 624 return (rc); 625 } 626 627 int 628 zvol_first_open(zvol_state_t *zv) 629 { 630 objset_t *os; 631 uint64_t volsize; 632 int error; 633 uint64_t readonly; 634 635 /* lie and say we're read-only */ 636 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 637 zvol_tag, &os); 638 if (error) 639 return (error); 640 641 zv->zv_objset = os; 642 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 643 if (error) { 644 ASSERT(error == 0); 645 dmu_objset_disown(os, zvol_tag); 646 return (error); 647 } 648 649 error = dnode_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dn); 650 if (error) { 651 dmu_objset_disown(os, zvol_tag); 652 return (error); 653 } 654 655 zvol_size_changed(zv, volsize); 656 zv->zv_zilog = zil_open(os, zvol_get_data); 657 658 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 659 NULL) == 0); 660 if (readonly || dmu_objset_is_snapshot(os) || 661 !spa_writeable(dmu_objset_spa(os))) 662 zv->zv_flags |= ZVOL_RDONLY; 663 else 664 zv->zv_flags &= ~ZVOL_RDONLY; 665 return (error); 666 } 667 668 void 669 zvol_last_close(zvol_state_t *zv) 670 { 671 zil_close(zv->zv_zilog); 672 zv->zv_zilog = NULL; 673 674 dnode_rele(zv->zv_dn, zvol_tag); 675 zv->zv_dn = NULL; 676 677 /* 678 * Evict cached data 679 */ 680 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && 681 !(zv->zv_flags & ZVOL_RDONLY)) 682 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 683 dmu_objset_evict_dbufs(zv->zv_objset); 684 685 dmu_objset_disown(zv->zv_objset, zvol_tag); 686 zv->zv_objset = NULL; 687 } 688 689 int 690 zvol_prealloc(zvol_state_t *zv) 691 { 692 objset_t *os = zv->zv_objset; 693 dmu_tx_t *tx; 694 uint64_t refd, avail, usedobjs, availobjs; 695 uint64_t resid = zv->zv_volsize; 696 uint64_t off = 0; 697 698 /* Check the space usage before attempting to allocate the space */ 699 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 700 if (avail < zv->zv_volsize) 701 return (SET_ERROR(ENOSPC)); 702 703 /* Free old extents if they exist */ 704 zvol_free_extents(zv); 705 706 while (resid != 0) { 707 int error; 708 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE); 709 710 tx = dmu_tx_create(os); 711 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 712 error = dmu_tx_assign(tx, TXG_WAIT); 713 if (error) { 714 dmu_tx_abort(tx); 715 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 716 return (error); 717 } 718 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 719 dmu_tx_commit(tx); 720 off += bytes; 721 resid -= bytes; 722 } 723 txg_wait_synced(dmu_objset_pool(os), 0); 724 725 return (0); 726 } 727 728 static int 729 zvol_update_volsize(objset_t *os, uint64_t volsize) 730 { 731 dmu_tx_t *tx; 732 int error; 733 734 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 735 736 tx = dmu_tx_create(os); 737 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 738 dmu_tx_mark_netfree(tx); 739 error = dmu_tx_assign(tx, TXG_WAIT); 740 if (error) { 741 dmu_tx_abort(tx); 742 return (error); 743 } 744 745 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 746 &volsize, tx); 747 dmu_tx_commit(tx); 748 749 if (error == 0) 750 error = dmu_free_long_range(os, 751 ZVOL_OBJ, volsize, DMU_OBJECT_END); 752 return (error); 753 } 754 755 void 756 zvol_remove_minors(const char *name) 757 { 758 zvol_state_t *zv; 759 char *namebuf; 760 minor_t minor; 761 762 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 763 (void) strncpy(namebuf, name, strlen(name)); 764 (void) strcat(namebuf, "/"); 765 mutex_enter(&zfsdev_state_lock); 766 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 767 768 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 769 if (zv == NULL) 770 continue; 771 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 772 (void) zvol_remove_zv(zv); 773 } 774 kmem_free(namebuf, strlen(name) + 2); 775 776 mutex_exit(&zfsdev_state_lock); 777 } 778 779 static int 780 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) 781 { 782 uint64_t old_volsize = 0ULL; 783 int error = 0; 784 785 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 786 787 /* 788 * Reinitialize the dump area to the new size. If we 789 * failed to resize the dump area then restore it back to 790 * its original size. We must set the new volsize prior 791 * to calling dumpvp_resize() to ensure that the devices' 792 * size(9P) is not visible by the dump subsystem. 793 */ 794 old_volsize = zv->zv_volsize; 795 zvol_size_changed(zv, volsize); 796 797 if (zv->zv_flags & ZVOL_DUMPIFIED) { 798 if ((error = zvol_dumpify(zv)) != 0 || 799 (error = dumpvp_resize()) != 0) { 800 int dumpify_error; 801 802 (void) zvol_update_volsize(zv->zv_objset, old_volsize); 803 zvol_size_changed(zv, old_volsize); 804 dumpify_error = zvol_dumpify(zv); 805 error = dumpify_error ? dumpify_error : error; 806 } 807 } 808 809 /* 810 * Generate a LUN expansion event. 811 */ 812 if (error == 0) { 813 sysevent_id_t eid; 814 nvlist_t *attr; 815 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 816 817 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 818 zv->zv_minor); 819 820 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 821 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 822 823 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 824 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 825 826 nvlist_free(attr); 827 kmem_free(physpath, MAXPATHLEN); 828 } 829 return (error); 830 } 831 832 int 833 zvol_set_volsize(const char *name, uint64_t volsize) 834 { 835 zvol_state_t *zv = NULL; 836 objset_t *os; 837 int error; 838 dmu_object_info_t doi; 839 uint64_t readonly; 840 boolean_t owned = B_FALSE; 841 842 error = dsl_prop_get_integer(name, 843 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); 844 if (error != 0) 845 return (error); 846 if (readonly) 847 return (SET_ERROR(EROFS)); 848 849 mutex_enter(&zfsdev_state_lock); 850 zv = zvol_minor_lookup(name); 851 852 if (zv == NULL || zv->zv_objset == NULL) { 853 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, 854 FTAG, &os)) != 0) { 855 mutex_exit(&zfsdev_state_lock); 856 return (error); 857 } 858 owned = B_TRUE; 859 if (zv != NULL) 860 zv->zv_objset = os; 861 } else { 862 os = zv->zv_objset; 863 } 864 865 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 866 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0) 867 goto out; 868 869 error = zvol_update_volsize(os, volsize); 870 871 if (error == 0 && zv != NULL) 872 error = zvol_update_live_volsize(zv, volsize); 873 out: 874 if (owned) { 875 dmu_objset_disown(os, FTAG); 876 if (zv != NULL) 877 zv->zv_objset = NULL; 878 } 879 mutex_exit(&zfsdev_state_lock); 880 return (error); 881 } 882 883 /*ARGSUSED*/ 884 int 885 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 886 { 887 zvol_state_t *zv; 888 int err = 0; 889 890 mutex_enter(&zfsdev_state_lock); 891 892 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 893 if (zv == NULL) { 894 mutex_exit(&zfsdev_state_lock); 895 return (SET_ERROR(ENXIO)); 896 } 897 898 if (zv->zv_total_opens == 0) 899 err = zvol_first_open(zv); 900 if (err) { 901 mutex_exit(&zfsdev_state_lock); 902 return (err); 903 } 904 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 905 err = SET_ERROR(EROFS); 906 goto out; 907 } 908 if (zv->zv_flags & ZVOL_EXCL) { 909 err = SET_ERROR(EBUSY); 910 goto out; 911 } 912 if (flag & FEXCL) { 913 if (zv->zv_total_opens != 0) { 914 err = SET_ERROR(EBUSY); 915 goto out; 916 } 917 zv->zv_flags |= ZVOL_EXCL; 918 } 919 920 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 921 zv->zv_open_count[otyp]++; 922 zv->zv_total_opens++; 923 } 924 mutex_exit(&zfsdev_state_lock); 925 926 return (err); 927 out: 928 if (zv->zv_total_opens == 0) 929 zvol_last_close(zv); 930 mutex_exit(&zfsdev_state_lock); 931 return (err); 932 } 933 934 /*ARGSUSED*/ 935 int 936 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 937 { 938 minor_t minor = getminor(dev); 939 zvol_state_t *zv; 940 int error = 0; 941 942 mutex_enter(&zfsdev_state_lock); 943 944 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 945 if (zv == NULL) { 946 mutex_exit(&zfsdev_state_lock); 947 return (SET_ERROR(ENXIO)); 948 } 949 950 if (zv->zv_flags & ZVOL_EXCL) { 951 ASSERT(zv->zv_total_opens == 1); 952 zv->zv_flags &= ~ZVOL_EXCL; 953 } 954 955 /* 956 * If the open count is zero, this is a spurious close. 957 * That indicates a bug in the kernel / DDI framework. 958 */ 959 ASSERT(zv->zv_open_count[otyp] != 0); 960 ASSERT(zv->zv_total_opens != 0); 961 962 /* 963 * You may get multiple opens, but only one close. 964 */ 965 zv->zv_open_count[otyp]--; 966 zv->zv_total_opens--; 967 968 if (zv->zv_total_opens == 0) 969 zvol_last_close(zv); 970 971 mutex_exit(&zfsdev_state_lock); 972 return (error); 973 } 974 975 /* ARGSUSED */ 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 rangelock_exit(zgd->zgd_lr); 983 984 kmem_free(zgd, sizeof (zgd_t)); 985 } 986 987 /* 988 * Get data to generate a TX_WRITE intent log record. 989 */ 990 static int 991 zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) 992 { 993 zvol_state_t *zv = arg; 994 uint64_t offset = lr->lr_offset; 995 uint64_t size = lr->lr_length; /* length of user data */ 996 dmu_buf_t *db; 997 zgd_t *zgd; 998 int error; 999 1000 ASSERT3P(lwb, !=, NULL); 1001 ASSERT3P(zio, !=, NULL); 1002 ASSERT3U(size, !=, 0); 1003 1004 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1005 zgd->zgd_lwb = lwb; 1006 1007 /* 1008 * Write records come in two flavors: immediate and indirect. 1009 * For small writes it's cheaper to store the data with the 1010 * log record (immediate); for large writes it's cheaper to 1011 * sync the data and get a pointer to it (indirect) so that 1012 * we don't have to write the data twice. 1013 */ 1014 if (buf != NULL) { /* immediate write */ 1015 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 1016 RL_READER); 1017 error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf, 1018 DMU_READ_NO_PREFETCH); 1019 } else { /* indirect write */ 1020 /* 1021 * Have to lock the whole block to ensure when it's written out 1022 * and its checksum is being calculated that no one can change 1023 * the data. Contrarily to zfs_get_data we need not re-check 1024 * blocksize after we get the lock because it cannot be changed. 1025 */ 1026 size = zv->zv_volblocksize; 1027 offset = P2ALIGN(offset, size); 1028 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 1029 RL_READER); 1030 error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db, 1031 DMU_READ_NO_PREFETCH); 1032 if (error == 0) { 1033 blkptr_t *bp = &lr->lr_blkptr; 1034 1035 zgd->zgd_db = db; 1036 zgd->zgd_bp = bp; 1037 1038 ASSERT(db->db_offset == offset); 1039 ASSERT(db->db_size == size); 1040 1041 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1042 zvol_get_done, zgd); 1043 1044 if (error == 0) 1045 return (0); 1046 } 1047 } 1048 1049 zvol_get_done(zgd, error); 1050 1051 return (error); 1052 } 1053 1054 /* 1055 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 1056 * 1057 * We store data in the log buffers if it's small enough. 1058 * Otherwise we will later flush the data out via dmu_sync(). 1059 */ 1060 ssize_t zvol_immediate_write_sz = 32768; 1061 1062 static void 1063 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1064 boolean_t sync) 1065 { 1066 uint32_t blocksize = zv->zv_volblocksize; 1067 zilog_t *zilog = zv->zv_zilog; 1068 itx_wr_state_t write_state; 1069 1070 if (zil_replaying(zilog, tx)) 1071 return; 1072 1073 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1074 write_state = WR_INDIRECT; 1075 else if (!spa_has_slogs(zilog->zl_spa) && 1076 resid >= blocksize && blocksize > zvol_immediate_write_sz) 1077 write_state = WR_INDIRECT; 1078 else if (sync) 1079 write_state = WR_COPIED; 1080 else 1081 write_state = WR_NEED_COPY; 1082 1083 while (resid) { 1084 itx_t *itx; 1085 lr_write_t *lr; 1086 itx_wr_state_t wr_state = write_state; 1087 ssize_t len = resid; 1088 1089 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) 1090 wr_state = WR_NEED_COPY; 1091 else if (wr_state == WR_INDIRECT) 1092 len = MIN(blocksize - P2PHASE(off, blocksize), resid); 1093 1094 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1095 (wr_state == WR_COPIED ? len : 0)); 1096 lr = (lr_write_t *)&itx->itx_lr; 1097 if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn, 1098 off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1099 zil_itx_destroy(itx); 1100 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1101 lr = (lr_write_t *)&itx->itx_lr; 1102 wr_state = WR_NEED_COPY; 1103 } 1104 1105 itx->itx_wr_state = wr_state; 1106 lr->lr_foid = ZVOL_OBJ; 1107 lr->lr_offset = off; 1108 lr->lr_length = len; 1109 lr->lr_blkoff = 0; 1110 BP_ZERO(&lr->lr_blkptr); 1111 1112 itx->itx_private = zv; 1113 itx->itx_sync = sync; 1114 1115 zil_itx_assign(zilog, itx, tx); 1116 1117 off += len; 1118 resid -= len; 1119 } 1120 } 1121 1122 static int 1123 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset, 1124 uint64_t size, boolean_t doread, boolean_t isdump) 1125 { 1126 vdev_disk_t *dvd; 1127 int c; 1128 int numerrors = 0; 1129 1130 if (vd->vdev_ops == &vdev_mirror_ops || 1131 vd->vdev_ops == &vdev_replacing_ops || 1132 vd->vdev_ops == &vdev_spare_ops) { 1133 for (c = 0; c < vd->vdev_children; c++) { 1134 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1135 addr, offset, origoffset, size, doread, isdump); 1136 if (err != 0) { 1137 numerrors++; 1138 } else if (doread) { 1139 break; 1140 } 1141 } 1142 } 1143 1144 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops) 1145 return (numerrors < vd->vdev_children ? 0 : EIO); 1146 1147 if (doread && !vdev_readable(vd)) 1148 return (SET_ERROR(EIO)); 1149 else if (!doread && !vdev_writeable(vd)) 1150 return (SET_ERROR(EIO)); 1151 1152 if (vd->vdev_ops == &vdev_raidz_ops) { 1153 return (vdev_raidz_physio(vd, 1154 addr, size, offset, origoffset, doread, isdump)); 1155 } 1156 1157 offset += VDEV_LABEL_START_SIZE; 1158 1159 if (ddi_in_panic() || isdump) { 1160 ASSERT(!doread); 1161 if (doread) 1162 return (SET_ERROR(EIO)); 1163 dvd = vd->vdev_tsd; 1164 ASSERT3P(dvd, !=, NULL); 1165 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1166 lbtodb(size))); 1167 } else { 1168 dvd = vd->vdev_tsd; 1169 ASSERT3P(dvd, !=, NULL); 1170 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size, 1171 offset, doread ? B_READ : B_WRITE)); 1172 } 1173 } 1174 1175 static int 1176 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1177 boolean_t doread, boolean_t isdump) 1178 { 1179 vdev_t *vd; 1180 int error; 1181 zvol_extent_t *ze; 1182 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1183 1184 /* Must be sector aligned, and not stradle a block boundary. */ 1185 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1186 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1187 return (SET_ERROR(EINVAL)); 1188 } 1189 ASSERT(size <= zv->zv_volblocksize); 1190 1191 /* Locate the extent this belongs to */ 1192 ze = list_head(&zv->zv_extents); 1193 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1194 offset -= ze->ze_nblks * zv->zv_volblocksize; 1195 ze = list_next(&zv->zv_extents, ze); 1196 } 1197 1198 if (ze == NULL) 1199 return (SET_ERROR(EINVAL)); 1200 1201 if (!ddi_in_panic()) 1202 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1203 1204 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1205 offset += DVA_GET_OFFSET(&ze->ze_dva); 1206 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva), 1207 size, doread, isdump); 1208 1209 if (!ddi_in_panic()) 1210 spa_config_exit(spa, SCL_STATE, FTAG); 1211 1212 return (error); 1213 } 1214 1215 int 1216 zvol_strategy(buf_t *bp) 1217 { 1218 zfs_soft_state_t *zs = NULL; 1219 zvol_state_t *zv; 1220 uint64_t off, volsize; 1221 size_t resid; 1222 char *addr; 1223 objset_t *os; 1224 int error = 0; 1225 boolean_t doread = bp->b_flags & B_READ; 1226 boolean_t is_dumpified; 1227 boolean_t sync; 1228 1229 if (getminor(bp->b_edev) == 0) { 1230 error = SET_ERROR(EINVAL); 1231 } else { 1232 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1233 if (zs == NULL) 1234 error = SET_ERROR(ENXIO); 1235 else if (zs->zss_type != ZSST_ZVOL) 1236 error = SET_ERROR(EINVAL); 1237 } 1238 1239 if (error) { 1240 bioerror(bp, error); 1241 biodone(bp); 1242 return (0); 1243 } 1244 1245 zv = zs->zss_data; 1246 1247 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1248 bioerror(bp, EROFS); 1249 biodone(bp); 1250 return (0); 1251 } 1252 1253 off = ldbtob(bp->b_blkno); 1254 volsize = zv->zv_volsize; 1255 1256 os = zv->zv_objset; 1257 ASSERT(os != NULL); 1258 1259 bp_mapin(bp); 1260 addr = bp->b_un.b_addr; 1261 resid = bp->b_bcount; 1262 1263 if (resid > 0 && (off < 0 || off >= volsize)) { 1264 bioerror(bp, EIO); 1265 biodone(bp); 1266 return (0); 1267 } 1268 1269 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED; 1270 sync = ((!(bp->b_flags & B_ASYNC) && 1271 !(zv->zv_flags & ZVOL_WCE)) || 1272 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1273 !doread && !is_dumpified; 1274 1275 smt_begin_unsafe(); 1276 1277 /* 1278 * There must be no buffer changes when doing a dmu_sync() because 1279 * we can't change the data whilst calculating the checksum. 1280 */ 1281 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, off, resid, 1282 doread ? RL_READER : RL_WRITER); 1283 1284 while (resid != 0 && off < volsize) { 1285 size_t size = MIN(resid, zvol_maxphys); 1286 if (is_dumpified) { 1287 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1288 error = zvol_dumpio(zv, addr, off, size, 1289 doread, B_FALSE); 1290 } else if (doread) { 1291 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1292 DMU_READ_PREFETCH); 1293 } else { 1294 dmu_tx_t *tx = dmu_tx_create(os); 1295 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1296 error = dmu_tx_assign(tx, TXG_WAIT); 1297 if (error) { 1298 dmu_tx_abort(tx); 1299 } else { 1300 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1301 zvol_log_write(zv, tx, off, size, sync); 1302 dmu_tx_commit(tx); 1303 } 1304 } 1305 if (error) { 1306 /* convert checksum errors into IO errors */ 1307 if (error == ECKSUM) 1308 error = SET_ERROR(EIO); 1309 break; 1310 } 1311 off += size; 1312 addr += size; 1313 resid -= size; 1314 } 1315 rangelock_exit(lr); 1316 1317 if ((bp->b_resid = resid) == bp->b_bcount) 1318 bioerror(bp, off > volsize ? EINVAL : error); 1319 1320 if (sync) 1321 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1322 biodone(bp); 1323 1324 smt_end_unsafe(); 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 int error = 0; 1387 1388 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1389 if (zv == NULL) 1390 return (SET_ERROR(ENXIO)); 1391 1392 volsize = zv->zv_volsize; 1393 if (uio->uio_resid > 0 && 1394 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1395 return (SET_ERROR(EIO)); 1396 1397 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1398 error = physio(zvol_strategy, NULL, dev, B_READ, 1399 zvol_minphys, uio); 1400 return (error); 1401 } 1402 1403 smt_begin_unsafe(); 1404 1405 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 1406 uio->uio_loffset, uio->uio_resid, RL_READER); 1407 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1408 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1409 1410 /* don't read past the end */ 1411 if (bytes > volsize - uio->uio_loffset) 1412 bytes = volsize - uio->uio_loffset; 1413 1414 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1415 if (error) { 1416 /* convert checksum errors into IO errors */ 1417 if (error == ECKSUM) 1418 error = SET_ERROR(EIO); 1419 break; 1420 } 1421 } 1422 rangelock_exit(lr); 1423 1424 smt_end_unsafe(); 1425 1426 return (error); 1427 } 1428 1429 /*ARGSUSED*/ 1430 int 1431 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1432 { 1433 minor_t minor = getminor(dev); 1434 zvol_state_t *zv; 1435 uint64_t volsize; 1436 int error = 0; 1437 boolean_t sync; 1438 1439 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1440 if (zv == NULL) 1441 return (SET_ERROR(ENXIO)); 1442 1443 volsize = zv->zv_volsize; 1444 if (uio->uio_resid > 0 && 1445 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1446 return (SET_ERROR(EIO)); 1447 1448 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1449 error = physio(zvol_strategy, NULL, dev, B_WRITE, 1450 zvol_minphys, uio); 1451 return (error); 1452 } 1453 1454 smt_begin_unsafe(); 1455 1456 sync = !(zv->zv_flags & ZVOL_WCE) || 1457 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1458 1459 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 1460 uio->uio_loffset, uio->uio_resid, RL_WRITER); 1461 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1462 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1463 uint64_t off = uio->uio_loffset; 1464 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1465 1466 if (bytes > volsize - off) /* don't write past the end */ 1467 bytes = volsize - off; 1468 1469 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1470 error = dmu_tx_assign(tx, TXG_WAIT); 1471 if (error) { 1472 dmu_tx_abort(tx); 1473 break; 1474 } 1475 error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx); 1476 if (error == 0) 1477 zvol_log_write(zv, tx, off, bytes, sync); 1478 dmu_tx_commit(tx); 1479 1480 if (error) 1481 break; 1482 } 1483 rangelock_exit(lr); 1484 1485 if (sync) 1486 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1487 1488 smt_end_unsafe(); 1489 1490 return (error); 1491 } 1492 1493 int 1494 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1495 { 1496 struct uuid uuid = EFI_RESERVED; 1497 efi_gpe_t gpe = { 0 }; 1498 uint32_t crc; 1499 dk_efi_t efi; 1500 int length; 1501 char *ptr; 1502 1503 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1504 return (SET_ERROR(EFAULT)); 1505 ptr = (char *)(uintptr_t)efi.dki_data_64; 1506 length = efi.dki_length; 1507 /* 1508 * Some clients may attempt to request a PMBR for the 1509 * zvol. Currently this interface will return EINVAL to 1510 * such requests. These requests could be supported by 1511 * adding a check for lba == 0 and consing up an appropriate 1512 * PMBR. 1513 */ 1514 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1515 return (SET_ERROR(EINVAL)); 1516 1517 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1518 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1519 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1520 1521 if (efi.dki_lba == 1) { 1522 efi_gpt_t gpt = { 0 }; 1523 1524 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1525 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1526 gpt.efi_gpt_HeaderSize = LE_32(EFI_HEADER_SIZE); 1527 gpt.efi_gpt_MyLBA = LE_64(1ULL); 1528 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1529 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1530 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1531 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1532 gpt.efi_gpt_SizeOfPartitionEntry = 1533 LE_32(sizeof (efi_gpe_t)); 1534 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1535 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1536 CRC32(crc, &gpt, EFI_HEADER_SIZE, -1U, crc32_table); 1537 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1538 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1539 flag)) 1540 return (SET_ERROR(EFAULT)); 1541 ptr += sizeof (gpt); 1542 length -= sizeof (gpt); 1543 } 1544 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1545 length), flag)) 1546 return (SET_ERROR(EFAULT)); 1547 return (0); 1548 } 1549 1550 /* 1551 * BEGIN entry points to allow external callers access to the volume. 1552 */ 1553 /* 1554 * Return the volume parameters needed for access from an external caller. 1555 * These values are invariant as long as the volume is held open. 1556 */ 1557 int 1558 zvol_get_volume_params(minor_t minor, uint64_t *blksize, 1559 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 1560 void **rl_hdl, void **dnode_hdl) 1561 { 1562 zvol_state_t *zv; 1563 1564 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1565 if (zv == NULL) 1566 return (SET_ERROR(ENXIO)); 1567 if (zv->zv_flags & ZVOL_DUMPIFIED) 1568 return (SET_ERROR(ENXIO)); 1569 1570 ASSERT(blksize && max_xfer_len && minor_hdl && 1571 objset_hdl && zil_hdl && rl_hdl && dnode_hdl); 1572 1573 *blksize = zv->zv_volblocksize; 1574 *max_xfer_len = (uint64_t)zvol_maxphys; 1575 *minor_hdl = zv; 1576 *objset_hdl = zv->zv_objset; 1577 *zil_hdl = zv->zv_zilog; 1578 *rl_hdl = &zv->zv_rangelock; 1579 *dnode_hdl = zv->zv_dn; 1580 return (0); 1581 } 1582 1583 /* 1584 * Return the current volume size to an external caller. 1585 * The size can change while the volume is open. 1586 */ 1587 uint64_t 1588 zvol_get_volume_size(void *minor_hdl) 1589 { 1590 zvol_state_t *zv = minor_hdl; 1591 1592 return (zv->zv_volsize); 1593 } 1594 1595 /* 1596 * Return the current WCE setting to an external caller. 1597 * The WCE setting can change while the volume is open. 1598 */ 1599 int 1600 zvol_get_volume_wce(void *minor_hdl) 1601 { 1602 zvol_state_t *zv = minor_hdl; 1603 1604 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 1605 } 1606 1607 /* 1608 * Entry point for external callers to zvol_log_write 1609 */ 1610 void 1611 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 1612 boolean_t sync) 1613 { 1614 zvol_state_t *zv = minor_hdl; 1615 1616 zvol_log_write(zv, tx, off, resid, sync); 1617 } 1618 /* 1619 * END entry points to allow external callers access to the volume. 1620 */ 1621 1622 /* 1623 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 1624 */ 1625 static void 1626 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 1627 boolean_t sync) 1628 { 1629 itx_t *itx; 1630 lr_truncate_t *lr; 1631 zilog_t *zilog = zv->zv_zilog; 1632 1633 if (zil_replaying(zilog, tx)) 1634 return; 1635 1636 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 1637 lr = (lr_truncate_t *)&itx->itx_lr; 1638 lr->lr_foid = ZVOL_OBJ; 1639 lr->lr_offset = off; 1640 lr->lr_length = len; 1641 1642 itx->itx_sync = sync; 1643 zil_itx_assign(zilog, itx, tx); 1644 } 1645 1646 /* 1647 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1648 * Also a dirtbag dkio ioctl for unmap/free-block functionality. 1649 */ 1650 /*ARGSUSED*/ 1651 int 1652 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1653 { 1654 zvol_state_t *zv; 1655 struct dk_callback *dkc; 1656 int error = 0; 1657 locked_range_t *lr; 1658 1659 mutex_enter(&zfsdev_state_lock); 1660 1661 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1662 1663 if (zv == NULL) { 1664 mutex_exit(&zfsdev_state_lock); 1665 return (SET_ERROR(ENXIO)); 1666 } 1667 ASSERT(zv->zv_total_opens > 0); 1668 1669 switch (cmd) { 1670 1671 case DKIOCINFO: 1672 { 1673 struct dk_cinfo dki; 1674 1675 bzero(&dki, sizeof (dki)); 1676 (void) strcpy(dki.dki_cname, "zvol"); 1677 (void) strcpy(dki.dki_dname, "zvol"); 1678 dki.dki_ctype = DKC_UNKNOWN; 1679 dki.dki_unit = getminor(dev); 1680 dki.dki_maxtransfer = 1681 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs); 1682 mutex_exit(&zfsdev_state_lock); 1683 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1684 error = SET_ERROR(EFAULT); 1685 return (error); 1686 } 1687 1688 case DKIOCGMEDIAINFO: 1689 { 1690 struct dk_minfo dkm; 1691 1692 bzero(&dkm, sizeof (dkm)); 1693 dkm.dki_lbsize = 1U << zv->zv_min_bs; 1694 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1695 dkm.dki_media_type = DK_UNKNOWN; 1696 mutex_exit(&zfsdev_state_lock); 1697 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1698 error = SET_ERROR(EFAULT); 1699 return (error); 1700 } 1701 1702 case DKIOCGMEDIAINFOEXT: 1703 { 1704 struct dk_minfo_ext dkmext; 1705 1706 bzero(&dkmext, sizeof (dkmext)); 1707 dkmext.dki_lbsize = 1U << zv->zv_min_bs; 1708 dkmext.dki_pbsize = zv->zv_volblocksize; 1709 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1710 dkmext.dki_media_type = DK_UNKNOWN; 1711 mutex_exit(&zfsdev_state_lock); 1712 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag)) 1713 error = SET_ERROR(EFAULT); 1714 return (error); 1715 } 1716 1717 case DKIOCGETEFI: 1718 { 1719 uint64_t vs = zv->zv_volsize; 1720 uint8_t bs = zv->zv_min_bs; 1721 1722 mutex_exit(&zfsdev_state_lock); 1723 error = zvol_getefi((void *)arg, flag, vs, bs); 1724 return (error); 1725 } 1726 1727 case DKIOCFLUSHWRITECACHE: 1728 dkc = (struct dk_callback *)arg; 1729 mutex_exit(&zfsdev_state_lock); 1730 1731 smt_begin_unsafe(); 1732 1733 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1734 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1735 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1736 error = 0; 1737 } 1738 1739 smt_end_unsafe(); 1740 1741 return (error); 1742 1743 case DKIOCGETWCE: 1744 { 1745 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1746 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1747 flag)) 1748 error = SET_ERROR(EFAULT); 1749 break; 1750 } 1751 case DKIOCSETWCE: 1752 { 1753 int wce; 1754 if (ddi_copyin((void *)arg, &wce, sizeof (int), 1755 flag)) { 1756 error = SET_ERROR(EFAULT); 1757 break; 1758 } 1759 if (wce) { 1760 zv->zv_flags |= ZVOL_WCE; 1761 mutex_exit(&zfsdev_state_lock); 1762 } else { 1763 zv->zv_flags &= ~ZVOL_WCE; 1764 mutex_exit(&zfsdev_state_lock); 1765 smt_begin_unsafe(); 1766 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1767 smt_end_unsafe(); 1768 } 1769 return (0); 1770 } 1771 1772 case DKIOCGGEOM: 1773 case DKIOCGVTOC: 1774 /* 1775 * commands using these (like prtvtoc) expect ENOTSUP 1776 * since we're emulating an EFI label 1777 */ 1778 error = SET_ERROR(ENOTSUP); 1779 break; 1780 1781 case DKIOCDUMPINIT: 1782 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1783 RL_WRITER); 1784 error = zvol_dumpify(zv); 1785 rangelock_exit(lr); 1786 break; 1787 1788 case DKIOCDUMPFINI: 1789 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 1790 break; 1791 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1792 RL_WRITER); 1793 error = zvol_dump_fini(zv); 1794 rangelock_exit(lr); 1795 break; 1796 1797 case DKIOCFREE: 1798 { 1799 dkioc_free_list_t *dfl; 1800 dmu_tx_t *tx; 1801 1802 if (!zvol_unmap_enabled) 1803 break; 1804 1805 if (!(flag & FKIOCTL)) { 1806 error = dfl_copyin((void *)arg, &dfl, flag, KM_SLEEP); 1807 if (error != 0) 1808 break; 1809 } else { 1810 dfl = (dkioc_free_list_t *)arg; 1811 ASSERT3U(dfl->dfl_num_exts, <=, DFL_COPYIN_MAX_EXTS); 1812 if (dfl->dfl_num_exts > DFL_COPYIN_MAX_EXTS) { 1813 error = SET_ERROR(EINVAL); 1814 break; 1815 } 1816 } 1817 1818 mutex_exit(&zfsdev_state_lock); 1819 1820 smt_begin_unsafe(); 1821 1822 for (int i = 0; i < dfl->dfl_num_exts; i++) { 1823 uint64_t start = dfl->dfl_exts[i].dfle_start, 1824 length = dfl->dfl_exts[i].dfle_length, 1825 end = start + length; 1826 1827 /* 1828 * Apply Postel's Law to length-checking. If they 1829 * overshoot, just blank out until the end, if there's 1830 * a need to blank out anything. 1831 */ 1832 if (start >= zv->zv_volsize) 1833 continue; /* No need to do anything... */ 1834 if (end > zv->zv_volsize) { 1835 end = DMU_OBJECT_END; 1836 length = end - start; 1837 } 1838 1839 lr = rangelock_enter(&zv->zv_rangelock, start, length, 1840 RL_WRITER); 1841 tx = dmu_tx_create(zv->zv_objset); 1842 error = dmu_tx_assign(tx, TXG_WAIT); 1843 if (error != 0) { 1844 dmu_tx_abort(tx); 1845 } else { 1846 zvol_log_truncate(zv, tx, start, length, 1847 B_TRUE); 1848 dmu_tx_commit(tx); 1849 error = dmu_free_long_range(zv->zv_objset, 1850 ZVOL_OBJ, start, length); 1851 } 1852 1853 rangelock_exit(lr); 1854 1855 if (error != 0) 1856 break; 1857 } 1858 1859 /* 1860 * If the write-cache is disabled, 'sync' property 1861 * is set to 'always', or if the caller is asking for 1862 * a synchronous free, commit this operation to the zil. 1863 * This will sync any previous uncommitted writes to the 1864 * zvol object. 1865 * Can be overridden by the zvol_unmap_sync_enabled tunable. 1866 */ 1867 if ((error == 0) && zvol_unmap_sync_enabled && 1868 (!(zv->zv_flags & ZVOL_WCE) || 1869 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) || 1870 (dfl->dfl_flags & DF_WAIT_SYNC))) { 1871 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1872 } 1873 1874 if (!(flag & FKIOCTL)) 1875 dfl_free(dfl); 1876 1877 smt_end_unsafe(); 1878 1879 return (error); 1880 } 1881 1882 default: 1883 error = SET_ERROR(ENOTTY); 1884 break; 1885 1886 } 1887 mutex_exit(&zfsdev_state_lock); 1888 return (error); 1889 } 1890 1891 int 1892 zvol_busy(void) 1893 { 1894 return (zvol_minors != 0); 1895 } 1896 1897 void 1898 zvol_init(void) 1899 { 1900 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1901 1) == 0); 1902 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1903 } 1904 1905 void 1906 zvol_fini(void) 1907 { 1908 mutex_destroy(&zfsdev_state_lock); 1909 ddi_soft_state_fini(&zfsdev_state); 1910 } 1911 1912 /*ARGSUSED*/ 1913 static int 1914 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx) 1915 { 1916 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1917 1918 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1919 return (1); 1920 return (0); 1921 } 1922 1923 /*ARGSUSED*/ 1924 static void 1925 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx) 1926 { 1927 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1928 1929 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx); 1930 } 1931 1932 static int 1933 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1934 { 1935 dmu_tx_t *tx; 1936 int error; 1937 objset_t *os = zv->zv_objset; 1938 spa_t *spa = dmu_objset_spa(os); 1939 vdev_t *vd = spa->spa_root_vdev; 1940 nvlist_t *nv = NULL; 1941 uint64_t version = spa_version(spa); 1942 uint64_t checksum, compress, refresrv, vbs, dedup; 1943 1944 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1945 ASSERT(vd->vdev_ops == &vdev_root_ops); 1946 1947 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1948 DMU_OBJECT_END); 1949 if (error != 0) 1950 return (error); 1951 /* wait for dmu_free_long_range to actually free the blocks */ 1952 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1953 1954 /* 1955 * If the pool on which the dump device is being initialized has more 1956 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is 1957 * enabled. If so, bump that feature's counter to indicate that the 1958 * feature is active. We also check the vdev type to handle the 1959 * following case: 1960 * # zpool create test raidz disk1 disk2 disk3 1961 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev), 1962 * the raidz vdev itself has 3 children. 1963 */ 1964 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) { 1965 if (!spa_feature_is_enabled(spa, 1966 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1967 return (SET_ERROR(ENOTSUP)); 1968 (void) dsl_sync_task(spa_name(spa), 1969 zfs_mvdev_dump_feature_check, 1970 zfs_mvdev_dump_activate_feature_sync, NULL, 1971 2, ZFS_SPACE_CHECK_RESERVED); 1972 } 1973 1974 if (!resize) { 1975 error = dsl_prop_get_integer(zv->zv_name, 1976 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1977 if (error == 0) { 1978 error = dsl_prop_get_integer(zv->zv_name, 1979 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, 1980 NULL); 1981 } 1982 if (error == 0) { 1983 error = dsl_prop_get_integer(zv->zv_name, 1984 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 1985 &refresrv, NULL); 1986 } 1987 if (error == 0) { 1988 error = dsl_prop_get_integer(zv->zv_name, 1989 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, 1990 NULL); 1991 } 1992 if (version >= SPA_VERSION_DEDUP && error == 0) { 1993 error = dsl_prop_get_integer(zv->zv_name, 1994 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 1995 } 1996 } 1997 if (error != 0) 1998 return (error); 1999 2000 tx = dmu_tx_create(os); 2001 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2002 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2003 error = dmu_tx_assign(tx, TXG_WAIT); 2004 if (error != 0) { 2005 dmu_tx_abort(tx); 2006 return (error); 2007 } 2008 2009 /* 2010 * If we are resizing the dump device then we only need to 2011 * update the refreservation to match the newly updated 2012 * zvolsize. Otherwise, we save off the original state of the 2013 * zvol so that we can restore them if the zvol is ever undumpified. 2014 */ 2015 if (resize) { 2016 error = zap_update(os, ZVOL_ZAP_OBJ, 2017 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2018 &zv->zv_volsize, tx); 2019 } else { 2020 error = zap_update(os, ZVOL_ZAP_OBJ, 2021 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 2022 &compress, tx); 2023 if (error == 0) { 2024 error = zap_update(os, ZVOL_ZAP_OBJ, 2025 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, 2026 &checksum, tx); 2027 } 2028 if (error == 0) { 2029 error = zap_update(os, ZVOL_ZAP_OBJ, 2030 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2031 &refresrv, tx); 2032 } 2033 if (error == 0) { 2034 error = zap_update(os, ZVOL_ZAP_OBJ, 2035 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 2036 &vbs, tx); 2037 } 2038 if (error == 0) { 2039 error = dmu_object_set_blocksize( 2040 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx); 2041 } 2042 if (version >= SPA_VERSION_DEDUP && error == 0) { 2043 error = zap_update(os, ZVOL_ZAP_OBJ, 2044 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 2045 &dedup, tx); 2046 } 2047 if (error == 0) 2048 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE; 2049 } 2050 dmu_tx_commit(tx); 2051 2052 /* 2053 * We only need update the zvol's property if we are initializing 2054 * the dump area for the first time. 2055 */ 2056 if (error == 0 && !resize) { 2057 /* 2058 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum 2059 * function. Otherwise, use the old default -- OFF. 2060 */ 2061 checksum = spa_feature_is_active(spa, 2062 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY : 2063 ZIO_CHECKSUM_OFF; 2064 2065 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2066 VERIFY(nvlist_add_uint64(nv, 2067 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 2068 VERIFY(nvlist_add_uint64(nv, 2069 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 2070 ZIO_COMPRESS_OFF) == 0); 2071 VERIFY(nvlist_add_uint64(nv, 2072 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 2073 checksum) == 0); 2074 if (version >= SPA_VERSION_DEDUP) { 2075 VERIFY(nvlist_add_uint64(nv, 2076 zfs_prop_to_name(ZFS_PROP_DEDUP), 2077 ZIO_CHECKSUM_OFF) == 0); 2078 } 2079 2080 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2081 nv, NULL); 2082 nvlist_free(nv); 2083 } 2084 2085 /* Allocate the space for the dump */ 2086 if (error == 0) 2087 error = zvol_prealloc(zv); 2088 return (error); 2089 } 2090 2091 static int 2092 zvol_dumpify(zvol_state_t *zv) 2093 { 2094 int error = 0; 2095 uint64_t dumpsize = 0; 2096 dmu_tx_t *tx; 2097 objset_t *os = zv->zv_objset; 2098 2099 if (zv->zv_flags & ZVOL_RDONLY) 2100 return (SET_ERROR(EROFS)); 2101 2102 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 2103 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 2104 boolean_t resize = (dumpsize > 0); 2105 2106 if ((error = zvol_dump_init(zv, resize)) != 0) { 2107 (void) zvol_dump_fini(zv); 2108 return (error); 2109 } 2110 } 2111 2112 /* 2113 * Build up our lba mapping. 2114 */ 2115 error = zvol_get_lbas(zv); 2116 if (error) { 2117 (void) zvol_dump_fini(zv); 2118 return (error); 2119 } 2120 2121 tx = dmu_tx_create(os); 2122 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2123 error = dmu_tx_assign(tx, TXG_WAIT); 2124 if (error) { 2125 dmu_tx_abort(tx); 2126 (void) zvol_dump_fini(zv); 2127 return (error); 2128 } 2129 2130 zv->zv_flags |= ZVOL_DUMPIFIED; 2131 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 2132 &zv->zv_volsize, tx); 2133 dmu_tx_commit(tx); 2134 2135 if (error) { 2136 (void) zvol_dump_fini(zv); 2137 return (error); 2138 } 2139 2140 txg_wait_synced(dmu_objset_pool(os), 0); 2141 return (0); 2142 } 2143 2144 static int 2145 zvol_dump_fini(zvol_state_t *zv) 2146 { 2147 dmu_tx_t *tx; 2148 objset_t *os = zv->zv_objset; 2149 nvlist_t *nv; 2150 int error = 0; 2151 uint64_t checksum, compress, refresrv, vbs, dedup; 2152 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 2153 2154 /* 2155 * Attempt to restore the zvol back to its pre-dumpified state. 2156 * This is a best-effort attempt as it's possible that not all 2157 * of these properties were initialized during the dumpify process 2158 * (i.e. error during zvol_dump_init). 2159 */ 2160 2161 tx = dmu_tx_create(os); 2162 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2163 error = dmu_tx_assign(tx, TXG_WAIT); 2164 if (error) { 2165 dmu_tx_abort(tx); 2166 return (error); 2167 } 2168 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 2169 dmu_tx_commit(tx); 2170 2171 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2172 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 2173 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2174 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 2175 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2176 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 2177 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2178 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 2179 2180 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2181 (void) nvlist_add_uint64(nv, 2182 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 2183 (void) nvlist_add_uint64(nv, 2184 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 2185 (void) nvlist_add_uint64(nv, 2186 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 2187 if (version >= SPA_VERSION_DEDUP && 2188 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2189 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 2190 (void) nvlist_add_uint64(nv, 2191 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 2192 } 2193 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2194 nv, NULL); 2195 nvlist_free(nv); 2196 2197 zvol_free_extents(zv); 2198 zv->zv_flags &= ~ZVOL_DUMPIFIED; 2199 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2200 /* wait for dmu_free_long_range to actually free the blocks */ 2201 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2202 tx = dmu_tx_create(os); 2203 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2204 error = dmu_tx_assign(tx, TXG_WAIT); 2205 if (error) { 2206 dmu_tx_abort(tx); 2207 return (error); 2208 } 2209 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2210 zv->zv_volblocksize = vbs; 2211 dmu_tx_commit(tx); 2212 2213 return (0); 2214 } 2215