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 /* ARGSUSED */ 400 static int 401 zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap) 402 { 403 zvol_state_t *zv = arg1; 404 lr_write_t *lr = arg2; 405 objset_t *os = zv->zv_objset; 406 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 407 uint64_t offset, length; 408 dmu_tx_t *tx; 409 int error; 410 411 if (byteswap) 412 byteswap_uint64_array(lr, sizeof (*lr)); 413 414 offset = lr->lr_offset; 415 length = lr->lr_length; 416 417 /* If it's a dmu_sync() block, write the whole block */ 418 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 419 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 420 if (length < blocksize) { 421 offset -= offset % blocksize; 422 length = blocksize; 423 } 424 } 425 426 tx = dmu_tx_create(os); 427 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 428 error = dmu_tx_assign(tx, TXG_WAIT); 429 if (error) { 430 dmu_tx_abort(tx); 431 } else { 432 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 433 dmu_tx_commit(tx); 434 } 435 436 return (error); 437 } 438 439 /* ARGSUSED */ 440 static int 441 zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap) 442 { 443 return (SET_ERROR(ENOTSUP)); 444 } 445 446 /* 447 * Callback vectors for replaying records. 448 * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 449 */ 450 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 451 zvol_replay_err, /* 0 no such transaction type */ 452 zvol_replay_err, /* TX_CREATE */ 453 zvol_replay_err, /* TX_MKDIR */ 454 zvol_replay_err, /* TX_MKXATTR */ 455 zvol_replay_err, /* TX_SYMLINK */ 456 zvol_replay_err, /* TX_REMOVE */ 457 zvol_replay_err, /* TX_RMDIR */ 458 zvol_replay_err, /* TX_LINK */ 459 zvol_replay_err, /* TX_RENAME */ 460 zvol_replay_write, /* TX_WRITE */ 461 zvol_replay_truncate, /* TX_TRUNCATE */ 462 zvol_replay_err, /* TX_SETATTR */ 463 zvol_replay_err, /* TX_ACL */ 464 zvol_replay_err, /* TX_CREATE_ACL */ 465 zvol_replay_err, /* TX_CREATE_ATTR */ 466 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 467 zvol_replay_err, /* TX_MKDIR_ACL */ 468 zvol_replay_err, /* TX_MKDIR_ATTR */ 469 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 470 zvol_replay_err, /* TX_WRITE2 */ 471 }; 472 473 int 474 zvol_name2minor(const char *name, minor_t *minor) 475 { 476 zvol_state_t *zv; 477 478 mutex_enter(&zfsdev_state_lock); 479 zv = zvol_minor_lookup(name); 480 if (minor && zv) 481 *minor = zv->zv_minor; 482 mutex_exit(&zfsdev_state_lock); 483 return (zv ? 0 : -1); 484 } 485 486 /* 487 * Create a minor node (plus a whole lot more) for the specified volume. 488 */ 489 int 490 zvol_create_minor(const char *name) 491 { 492 zfs_soft_state_t *zs; 493 zvol_state_t *zv; 494 objset_t *os; 495 dmu_object_info_t doi; 496 minor_t minor = 0; 497 char chrbuf[30], blkbuf[30]; 498 int error; 499 500 mutex_enter(&zfsdev_state_lock); 501 502 if (zvol_minor_lookup(name) != NULL) { 503 mutex_exit(&zfsdev_state_lock); 504 return (SET_ERROR(EEXIST)); 505 } 506 507 /* lie and say we're read-only */ 508 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, B_TRUE, FTAG, &os); 509 510 if (error) { 511 mutex_exit(&zfsdev_state_lock); 512 return (error); 513 } 514 515 if ((minor = zfsdev_minor_alloc()) == 0) { 516 dmu_objset_disown(os, 1, FTAG); 517 mutex_exit(&zfsdev_state_lock); 518 return (SET_ERROR(ENXIO)); 519 } 520 521 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 522 dmu_objset_disown(os, 1, FTAG); 523 mutex_exit(&zfsdev_state_lock); 524 return (SET_ERROR(EAGAIN)); 525 } 526 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 527 (char *)name); 528 529 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 530 531 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 532 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 533 ddi_soft_state_free(zfsdev_state, minor); 534 dmu_objset_disown(os, 1, FTAG); 535 mutex_exit(&zfsdev_state_lock); 536 return (SET_ERROR(EAGAIN)); 537 } 538 539 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 540 541 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 542 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 543 ddi_remove_minor_node(zfs_dip, chrbuf); 544 ddi_soft_state_free(zfsdev_state, minor); 545 dmu_objset_disown(os, 1, FTAG); 546 mutex_exit(&zfsdev_state_lock); 547 return (SET_ERROR(EAGAIN)); 548 } 549 550 zs = ddi_get_soft_state(zfsdev_state, minor); 551 zs->zss_type = ZSST_ZVOL; 552 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 553 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 554 zv->zv_min_bs = DEV_BSHIFT; 555 zv->zv_minor = minor; 556 zv->zv_objset = os; 557 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 558 zv->zv_flags |= ZVOL_RDONLY; 559 rangelock_init(&zv->zv_rangelock, NULL, NULL); 560 list_create(&zv->zv_extents, sizeof (zvol_extent_t), 561 offsetof(zvol_extent_t, ze_node)); 562 /* get and cache the blocksize */ 563 error = dmu_object_info(os, ZVOL_OBJ, &doi); 564 ASSERT(error == 0); 565 zv->zv_volblocksize = doi.doi_data_block_size; 566 567 if (spa_writeable(dmu_objset_spa(os))) { 568 if (zil_replay_disable) 569 zil_destroy(dmu_objset_zil(os), B_FALSE); 570 else 571 zil_replay(os, zv, zvol_replay_vector); 572 } 573 dmu_objset_disown(os, 1, FTAG); 574 zv->zv_objset = NULL; 575 576 zvol_minors++; 577 578 mutex_exit(&zfsdev_state_lock); 579 580 return (0); 581 } 582 583 /* 584 * Remove minor node for the specified volume. 585 */ 586 static int 587 zvol_remove_zv(zvol_state_t *zv) 588 { 589 char nmbuf[20]; 590 minor_t minor = zv->zv_minor; 591 592 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 593 if (zv->zv_total_opens != 0) 594 return (SET_ERROR(EBUSY)); 595 596 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 597 ddi_remove_minor_node(zfs_dip, nmbuf); 598 599 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 600 ddi_remove_minor_node(zfs_dip, nmbuf); 601 602 rangelock_fini(&zv->zv_rangelock); 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, boolean_t rdonly) 630 { 631 objset_t *os; 632 uint64_t volsize; 633 int error; 634 uint64_t readonly; 635 boolean_t ro; 636 637 ro = (rdonly || (strchr(zv->zv_name, '@') != NULL)); 638 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, ro, B_TRUE, zv, &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, 1, 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, 1, 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, 1, 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 uint64_t txg; 735 736 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 737 738 tx = dmu_tx_create(os); 739 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 740 dmu_tx_mark_netfree(tx); 741 error = dmu_tx_assign(tx, TXG_WAIT); 742 if (error) { 743 dmu_tx_abort(tx); 744 return (error); 745 } 746 txg = dmu_tx_get_txg(tx); 747 748 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 749 &volsize, tx); 750 dmu_tx_commit(tx); 751 752 txg_wait_synced(dmu_objset_pool(os), txg); 753 754 if (error == 0) 755 error = dmu_free_long_range(os, 756 ZVOL_OBJ, volsize, DMU_OBJECT_END); 757 return (error); 758 } 759 760 void 761 zvol_remove_minors(const char *name) 762 { 763 zvol_state_t *zv; 764 char *namebuf; 765 minor_t minor; 766 767 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 768 (void) strncpy(namebuf, name, strlen(name)); 769 (void) strcat(namebuf, "/"); 770 mutex_enter(&zfsdev_state_lock); 771 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 772 773 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 774 if (zv == NULL) 775 continue; 776 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 777 (void) zvol_remove_zv(zv); 778 } 779 kmem_free(namebuf, strlen(name) + 2); 780 781 mutex_exit(&zfsdev_state_lock); 782 } 783 784 static int 785 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) 786 { 787 uint64_t old_volsize = 0ULL; 788 int error = 0; 789 790 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 791 792 /* 793 * Reinitialize the dump area to the new size. If we 794 * failed to resize the dump area then restore it back to 795 * its original size. We must set the new volsize prior 796 * to calling dumpvp_resize() to ensure that the devices' 797 * size(9P) is not visible by the dump subsystem. 798 */ 799 old_volsize = zv->zv_volsize; 800 zvol_size_changed(zv, volsize); 801 802 if (zv->zv_flags & ZVOL_DUMPIFIED) { 803 if ((error = zvol_dumpify(zv)) != 0 || 804 (error = dumpvp_resize()) != 0) { 805 int dumpify_error; 806 807 (void) zvol_update_volsize(zv->zv_objset, old_volsize); 808 zvol_size_changed(zv, old_volsize); 809 dumpify_error = zvol_dumpify(zv); 810 error = dumpify_error ? dumpify_error : error; 811 } 812 } 813 814 /* 815 * Generate a LUN expansion event. 816 */ 817 if (error == 0) { 818 sysevent_id_t eid; 819 nvlist_t *attr; 820 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 821 822 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 823 zv->zv_minor); 824 825 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 826 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 827 828 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 829 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 830 831 nvlist_free(attr); 832 kmem_free(physpath, MAXPATHLEN); 833 } 834 return (error); 835 } 836 837 int 838 zvol_set_volsize(const char *name, uint64_t volsize) 839 { 840 zvol_state_t *zv = NULL; 841 objset_t *os; 842 int error; 843 dmu_object_info_t doi; 844 uint64_t readonly; 845 boolean_t owned = B_FALSE; 846 847 error = dsl_prop_get_integer(name, 848 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); 849 if (error != 0) 850 return (error); 851 if (readonly) 852 return (SET_ERROR(EROFS)); 853 854 mutex_enter(&zfsdev_state_lock); 855 zv = zvol_minor_lookup(name); 856 857 if (zv == NULL || zv->zv_objset == NULL) { 858 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, B_TRUE, 859 FTAG, &os)) != 0) { 860 mutex_exit(&zfsdev_state_lock); 861 return (error); 862 } 863 owned = B_TRUE; 864 if (zv != NULL) 865 zv->zv_objset = os; 866 } else { 867 os = zv->zv_objset; 868 } 869 870 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 871 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0) 872 goto out; 873 874 error = zvol_update_volsize(os, volsize); 875 876 if (error == 0 && zv != NULL) 877 error = zvol_update_live_volsize(zv, volsize); 878 out: 879 if (owned) { 880 dmu_objset_disown(os, B_TRUE, FTAG); 881 if (zv != NULL) 882 zv->zv_objset = NULL; 883 } 884 mutex_exit(&zfsdev_state_lock); 885 return (error); 886 } 887 888 /*ARGSUSED*/ 889 int 890 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 891 { 892 zvol_state_t *zv; 893 int err = 0; 894 895 mutex_enter(&zfsdev_state_lock); 896 897 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 898 if (zv == NULL) { 899 mutex_exit(&zfsdev_state_lock); 900 return (SET_ERROR(ENXIO)); 901 } 902 903 if (zv->zv_total_opens == 0) 904 err = zvol_first_open(zv, !(flag & FWRITE)); 905 if (err) { 906 mutex_exit(&zfsdev_state_lock); 907 return (err); 908 } 909 910 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 911 err = SET_ERROR(EROFS); 912 goto out; 913 } 914 if (zv->zv_flags & ZVOL_EXCL) { 915 err = SET_ERROR(EBUSY); 916 goto out; 917 } 918 if (flag & FEXCL) { 919 if (zv->zv_total_opens != 0) { 920 err = SET_ERROR(EBUSY); 921 goto out; 922 } 923 zv->zv_flags |= ZVOL_EXCL; 924 } 925 926 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 927 zv->zv_open_count[otyp]++; 928 zv->zv_total_opens++; 929 } 930 mutex_exit(&zfsdev_state_lock); 931 932 return (err); 933 out: 934 if (zv->zv_total_opens == 0) 935 zvol_last_close(zv); 936 mutex_exit(&zfsdev_state_lock); 937 return (err); 938 } 939 940 /*ARGSUSED*/ 941 int 942 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 943 { 944 minor_t minor = getminor(dev); 945 zvol_state_t *zv; 946 int error = 0; 947 948 mutex_enter(&zfsdev_state_lock); 949 950 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 951 if (zv == NULL) { 952 mutex_exit(&zfsdev_state_lock); 953 return (SET_ERROR(ENXIO)); 954 } 955 956 if (zv->zv_flags & ZVOL_EXCL) { 957 ASSERT(zv->zv_total_opens == 1); 958 zv->zv_flags &= ~ZVOL_EXCL; 959 } 960 961 /* 962 * If the open count is zero, this is a spurious close. 963 * That indicates a bug in the kernel / DDI framework. 964 */ 965 ASSERT(zv->zv_open_count[otyp] != 0); 966 ASSERT(zv->zv_total_opens != 0); 967 968 /* 969 * You may get multiple opens, but only one close. 970 */ 971 zv->zv_open_count[otyp]--; 972 zv->zv_total_opens--; 973 974 if (zv->zv_total_opens == 0) 975 zvol_last_close(zv); 976 977 mutex_exit(&zfsdev_state_lock); 978 return (error); 979 } 980 981 /* ARGSUSED */ 982 static void 983 zvol_get_done(zgd_t *zgd, int error) 984 { 985 if (zgd->zgd_db) 986 dmu_buf_rele(zgd->zgd_db, zgd); 987 988 rangelock_exit(zgd->zgd_lr); 989 990 kmem_free(zgd, sizeof (zgd_t)); 991 } 992 993 /* 994 * Get data to generate a TX_WRITE intent log record. 995 */ 996 static int 997 zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) 998 { 999 zvol_state_t *zv = arg; 1000 uint64_t offset = lr->lr_offset; 1001 uint64_t size = lr->lr_length; /* length of user data */ 1002 dmu_buf_t *db; 1003 zgd_t *zgd; 1004 int error; 1005 1006 ASSERT3P(lwb, !=, NULL); 1007 ASSERT3P(zio, !=, NULL); 1008 ASSERT3U(size, !=, 0); 1009 1010 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1011 zgd->zgd_lwb = lwb; 1012 1013 /* 1014 * Write records come in two flavors: immediate and indirect. 1015 * For small writes it's cheaper to store the data with the 1016 * log record (immediate); for large writes it's cheaper to 1017 * sync the data and get a pointer to it (indirect) so that 1018 * we don't have to write the data twice. 1019 */ 1020 if (buf != NULL) { /* immediate write */ 1021 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 1022 RL_READER); 1023 error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf, 1024 DMU_READ_NO_PREFETCH); 1025 } else { /* indirect write */ 1026 /* 1027 * Have to lock the whole block to ensure when it's written out 1028 * and its checksum is being calculated that no one can change 1029 * the data. Contrarily to zfs_get_data we need not re-check 1030 * blocksize after we get the lock because it cannot be changed. 1031 */ 1032 size = zv->zv_volblocksize; 1033 offset = P2ALIGN(offset, size); 1034 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 1035 RL_READER); 1036 error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db, 1037 DMU_READ_NO_PREFETCH); 1038 if (error == 0) { 1039 blkptr_t *bp = &lr->lr_blkptr; 1040 1041 zgd->zgd_db = db; 1042 zgd->zgd_bp = bp; 1043 1044 ASSERT(db->db_offset == offset); 1045 ASSERT(db->db_size == size); 1046 1047 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1048 zvol_get_done, zgd); 1049 1050 if (error == 0) 1051 return (0); 1052 } 1053 } 1054 1055 zvol_get_done(zgd, error); 1056 1057 return (error); 1058 } 1059 1060 /* 1061 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 1062 * 1063 * We store data in the log buffers if it's small enough. 1064 * Otherwise we will later flush the data out via dmu_sync(). 1065 */ 1066 ssize_t zvol_immediate_write_sz = 32768; 1067 1068 static void 1069 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1070 boolean_t sync) 1071 { 1072 uint32_t blocksize = zv->zv_volblocksize; 1073 zilog_t *zilog = zv->zv_zilog; 1074 itx_wr_state_t write_state; 1075 1076 if (zil_replaying(zilog, tx)) 1077 return; 1078 1079 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1080 write_state = WR_INDIRECT; 1081 else if (!spa_has_slogs(zilog->zl_spa) && 1082 resid >= blocksize && blocksize > zvol_immediate_write_sz) 1083 write_state = WR_INDIRECT; 1084 else if (sync) 1085 write_state = WR_COPIED; 1086 else 1087 write_state = WR_NEED_COPY; 1088 1089 while (resid) { 1090 itx_t *itx; 1091 lr_write_t *lr; 1092 itx_wr_state_t wr_state = write_state; 1093 ssize_t len = resid; 1094 1095 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) 1096 wr_state = WR_NEED_COPY; 1097 else if (wr_state == WR_INDIRECT) 1098 len = MIN(blocksize - P2PHASE(off, blocksize), resid); 1099 1100 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1101 (wr_state == WR_COPIED ? len : 0)); 1102 lr = (lr_write_t *)&itx->itx_lr; 1103 if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn, 1104 off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1105 zil_itx_destroy(itx); 1106 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1107 lr = (lr_write_t *)&itx->itx_lr; 1108 wr_state = WR_NEED_COPY; 1109 } 1110 1111 itx->itx_wr_state = wr_state; 1112 lr->lr_foid = ZVOL_OBJ; 1113 lr->lr_offset = off; 1114 lr->lr_length = len; 1115 lr->lr_blkoff = 0; 1116 BP_ZERO(&lr->lr_blkptr); 1117 1118 itx->itx_private = zv; 1119 itx->itx_sync = sync; 1120 1121 zil_itx_assign(zilog, itx, tx); 1122 1123 off += len; 1124 resid -= len; 1125 } 1126 } 1127 1128 static int 1129 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset, 1130 uint64_t size, boolean_t doread, boolean_t isdump) 1131 { 1132 vdev_disk_t *dvd; 1133 int c; 1134 int numerrors = 0; 1135 1136 if (vd->vdev_ops == &vdev_mirror_ops || 1137 vd->vdev_ops == &vdev_replacing_ops || 1138 vd->vdev_ops == &vdev_spare_ops) { 1139 for (c = 0; c < vd->vdev_children; c++) { 1140 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1141 addr, offset, origoffset, size, doread, isdump); 1142 if (err != 0) { 1143 numerrors++; 1144 } else if (doread) { 1145 break; 1146 } 1147 } 1148 } 1149 1150 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops) 1151 return (numerrors < vd->vdev_children ? 0 : EIO); 1152 1153 if (doread && !vdev_readable(vd)) 1154 return (SET_ERROR(EIO)); 1155 else if (!doread && !vdev_writeable(vd)) 1156 return (SET_ERROR(EIO)); 1157 1158 if (vd->vdev_ops == &vdev_raidz_ops) { 1159 return (vdev_raidz_physio(vd, 1160 addr, size, offset, origoffset, doread, isdump)); 1161 } 1162 1163 offset += VDEV_LABEL_START_SIZE; 1164 1165 if (ddi_in_panic() || isdump) { 1166 ASSERT(!doread); 1167 if (doread) 1168 return (SET_ERROR(EIO)); 1169 dvd = vd->vdev_tsd; 1170 ASSERT3P(dvd, !=, NULL); 1171 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1172 lbtodb(size))); 1173 } else { 1174 dvd = vd->vdev_tsd; 1175 ASSERT3P(dvd, !=, NULL); 1176 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size, 1177 offset, doread ? B_READ : B_WRITE)); 1178 } 1179 } 1180 1181 static int 1182 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1183 boolean_t doread, boolean_t isdump) 1184 { 1185 vdev_t *vd; 1186 int error; 1187 zvol_extent_t *ze; 1188 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1189 1190 /* Must be sector aligned, and not stradle a block boundary. */ 1191 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1192 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1193 return (SET_ERROR(EINVAL)); 1194 } 1195 ASSERT(size <= zv->zv_volblocksize); 1196 1197 /* Locate the extent this belongs to */ 1198 ze = list_head(&zv->zv_extents); 1199 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1200 offset -= ze->ze_nblks * zv->zv_volblocksize; 1201 ze = list_next(&zv->zv_extents, ze); 1202 } 1203 1204 if (ze == NULL) 1205 return (SET_ERROR(EINVAL)); 1206 1207 if (!ddi_in_panic()) 1208 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1209 1210 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1211 offset += DVA_GET_OFFSET(&ze->ze_dva); 1212 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva), 1213 size, doread, isdump); 1214 1215 if (!ddi_in_panic()) 1216 spa_config_exit(spa, SCL_STATE, FTAG); 1217 1218 return (error); 1219 } 1220 1221 int 1222 zvol_strategy(buf_t *bp) 1223 { 1224 zfs_soft_state_t *zs = NULL; 1225 zvol_state_t *zv; 1226 uint64_t off, volsize; 1227 size_t resid; 1228 char *addr; 1229 objset_t *os; 1230 int error = 0; 1231 boolean_t doread = bp->b_flags & B_READ; 1232 boolean_t is_dumpified; 1233 boolean_t sync; 1234 1235 if (getminor(bp->b_edev) == 0) { 1236 error = SET_ERROR(EINVAL); 1237 } else { 1238 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1239 if (zs == NULL) 1240 error = SET_ERROR(ENXIO); 1241 else if (zs->zss_type != ZSST_ZVOL) 1242 error = SET_ERROR(EINVAL); 1243 } 1244 1245 if (error) { 1246 bioerror(bp, error); 1247 biodone(bp); 1248 return (0); 1249 } 1250 1251 zv = zs->zss_data; 1252 1253 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1254 bioerror(bp, EROFS); 1255 biodone(bp); 1256 return (0); 1257 } 1258 1259 off = ldbtob(bp->b_blkno); 1260 volsize = zv->zv_volsize; 1261 1262 os = zv->zv_objset; 1263 ASSERT(os != NULL); 1264 1265 bp_mapin(bp); 1266 addr = bp->b_un.b_addr; 1267 resid = bp->b_bcount; 1268 1269 if (resid > 0 && (off < 0 || off >= volsize)) { 1270 bioerror(bp, EIO); 1271 biodone(bp); 1272 return (0); 1273 } 1274 1275 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED; 1276 sync = ((!(bp->b_flags & B_ASYNC) && 1277 !(zv->zv_flags & ZVOL_WCE)) || 1278 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1279 !doread && !is_dumpified; 1280 1281 smt_begin_unsafe(); 1282 1283 /* 1284 * There must be no buffer changes when doing a dmu_sync() because 1285 * we can't change the data whilst calculating the checksum. 1286 */ 1287 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, off, resid, 1288 doread ? RL_READER : RL_WRITER); 1289 1290 while (resid != 0 && off < volsize) { 1291 size_t size = MIN(resid, zvol_maxphys); 1292 if (is_dumpified) { 1293 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1294 error = zvol_dumpio(zv, addr, off, size, 1295 doread, B_FALSE); 1296 } else if (doread) { 1297 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1298 DMU_READ_PREFETCH); 1299 } else { 1300 dmu_tx_t *tx = dmu_tx_create(os); 1301 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1302 error = dmu_tx_assign(tx, TXG_WAIT); 1303 if (error) { 1304 dmu_tx_abort(tx); 1305 } else { 1306 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1307 zvol_log_write(zv, tx, off, size, sync); 1308 dmu_tx_commit(tx); 1309 } 1310 } 1311 if (error) { 1312 /* convert checksum errors into IO errors */ 1313 if (error == ECKSUM) 1314 error = SET_ERROR(EIO); 1315 break; 1316 } 1317 off += size; 1318 addr += size; 1319 resid -= size; 1320 } 1321 rangelock_exit(lr); 1322 1323 if ((bp->b_resid = resid) == bp->b_bcount) 1324 bioerror(bp, off > volsize ? EINVAL : error); 1325 1326 if (sync) 1327 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1328 biodone(bp); 1329 1330 smt_end_unsafe(); 1331 1332 return (0); 1333 } 1334 1335 /* 1336 * Set the buffer count to the zvol maximum transfer. 1337 * Using our own routine instead of the default minphys() 1338 * means that for larger writes we write bigger buffers on X86 1339 * (128K instead of 56K) and flush the disk write cache less often 1340 * (every zvol_maxphys - currently 1MB) instead of minphys (currently 1341 * 56K on X86 and 128K on sparc). 1342 */ 1343 void 1344 zvol_minphys(struct buf *bp) 1345 { 1346 if (bp->b_bcount > zvol_maxphys) 1347 bp->b_bcount = zvol_maxphys; 1348 } 1349 1350 int 1351 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1352 { 1353 minor_t minor = getminor(dev); 1354 zvol_state_t *zv; 1355 int error = 0; 1356 uint64_t size; 1357 uint64_t boff; 1358 uint64_t resid; 1359 1360 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1361 if (zv == NULL) 1362 return (SET_ERROR(ENXIO)); 1363 1364 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0) 1365 return (SET_ERROR(EINVAL)); 1366 1367 boff = ldbtob(blkno); 1368 resid = ldbtob(nblocks); 1369 1370 VERIFY3U(boff + resid, <=, zv->zv_volsize); 1371 1372 while (resid) { 1373 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 1374 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1375 if (error) 1376 break; 1377 boff += size; 1378 addr += size; 1379 resid -= size; 1380 } 1381 1382 return (error); 1383 } 1384 1385 /*ARGSUSED*/ 1386 int 1387 zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1388 { 1389 minor_t minor = getminor(dev); 1390 zvol_state_t *zv; 1391 uint64_t volsize; 1392 int error = 0; 1393 1394 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1395 if (zv == NULL) 1396 return (SET_ERROR(ENXIO)); 1397 1398 volsize = zv->zv_volsize; 1399 if (uio->uio_resid > 0 && 1400 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1401 return (SET_ERROR(EIO)); 1402 1403 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1404 error = physio(zvol_strategy, NULL, dev, B_READ, 1405 zvol_minphys, uio); 1406 return (error); 1407 } 1408 1409 smt_begin_unsafe(); 1410 1411 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 1412 uio->uio_loffset, uio->uio_resid, RL_READER); 1413 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1414 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1415 1416 /* don't read past the end */ 1417 if (bytes > volsize - uio->uio_loffset) 1418 bytes = volsize - uio->uio_loffset; 1419 1420 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1421 if (error) { 1422 /* convert checksum errors into IO errors */ 1423 if (error == ECKSUM) 1424 error = SET_ERROR(EIO); 1425 break; 1426 } 1427 } 1428 rangelock_exit(lr); 1429 1430 smt_end_unsafe(); 1431 1432 return (error); 1433 } 1434 1435 /*ARGSUSED*/ 1436 int 1437 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1438 { 1439 minor_t minor = getminor(dev); 1440 zvol_state_t *zv; 1441 uint64_t volsize; 1442 int error = 0; 1443 boolean_t sync; 1444 1445 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1446 if (zv == NULL) 1447 return (SET_ERROR(ENXIO)); 1448 1449 volsize = zv->zv_volsize; 1450 if (uio->uio_resid > 0 && 1451 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1452 return (SET_ERROR(EIO)); 1453 1454 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1455 error = physio(zvol_strategy, NULL, dev, B_WRITE, 1456 zvol_minphys, uio); 1457 return (error); 1458 } 1459 1460 smt_begin_unsafe(); 1461 1462 sync = !(zv->zv_flags & ZVOL_WCE) || 1463 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1464 1465 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 1466 uio->uio_loffset, uio->uio_resid, RL_WRITER); 1467 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1468 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1469 uint64_t off = uio->uio_loffset; 1470 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1471 1472 if (bytes > volsize - off) /* don't write past the end */ 1473 bytes = volsize - off; 1474 1475 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1476 error = dmu_tx_assign(tx, TXG_WAIT); 1477 if (error) { 1478 dmu_tx_abort(tx); 1479 break; 1480 } 1481 error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx); 1482 if (error == 0) 1483 zvol_log_write(zv, tx, off, bytes, sync); 1484 dmu_tx_commit(tx); 1485 1486 if (error) 1487 break; 1488 } 1489 rangelock_exit(lr); 1490 1491 if (sync) 1492 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1493 1494 smt_end_unsafe(); 1495 1496 return (error); 1497 } 1498 1499 int 1500 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1501 { 1502 struct uuid uuid = EFI_RESERVED; 1503 efi_gpe_t gpe = { 0 }; 1504 uint32_t crc; 1505 dk_efi_t efi; 1506 int length; 1507 char *ptr; 1508 1509 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1510 return (SET_ERROR(EFAULT)); 1511 ptr = (char *)(uintptr_t)efi.dki_data_64; 1512 length = efi.dki_length; 1513 /* 1514 * Some clients may attempt to request a PMBR for the 1515 * zvol. Currently this interface will return EINVAL to 1516 * such requests. These requests could be supported by 1517 * adding a check for lba == 0 and consing up an appropriate 1518 * PMBR. 1519 */ 1520 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1521 return (SET_ERROR(EINVAL)); 1522 1523 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1524 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1525 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1526 1527 if (efi.dki_lba == 1) { 1528 efi_gpt_t gpt = { 0 }; 1529 1530 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1531 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1532 gpt.efi_gpt_HeaderSize = LE_32(EFI_HEADER_SIZE); 1533 gpt.efi_gpt_MyLBA = LE_64(1ULL); 1534 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1535 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1536 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1537 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1538 gpt.efi_gpt_SizeOfPartitionEntry = 1539 LE_32(sizeof (efi_gpe_t)); 1540 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1541 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1542 CRC32(crc, &gpt, EFI_HEADER_SIZE, -1U, crc32_table); 1543 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1544 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1545 flag)) 1546 return (SET_ERROR(EFAULT)); 1547 ptr += sizeof (gpt); 1548 length -= sizeof (gpt); 1549 } 1550 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1551 length), flag)) 1552 return (SET_ERROR(EFAULT)); 1553 return (0); 1554 } 1555 1556 /* 1557 * BEGIN entry points to allow external callers access to the volume. 1558 */ 1559 /* 1560 * Return the volume parameters needed for access from an external caller. 1561 * These values are invariant as long as the volume is held open. 1562 */ 1563 int 1564 zvol_get_volume_params(minor_t minor, uint64_t *blksize, 1565 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 1566 void **rl_hdl, void **dnode_hdl) 1567 { 1568 zvol_state_t *zv; 1569 1570 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1571 if (zv == NULL) 1572 return (SET_ERROR(ENXIO)); 1573 if (zv->zv_flags & ZVOL_DUMPIFIED) 1574 return (SET_ERROR(ENXIO)); 1575 1576 ASSERT(blksize && max_xfer_len && minor_hdl && 1577 objset_hdl && zil_hdl && rl_hdl && dnode_hdl); 1578 1579 *blksize = zv->zv_volblocksize; 1580 *max_xfer_len = (uint64_t)zvol_maxphys; 1581 *minor_hdl = zv; 1582 *objset_hdl = zv->zv_objset; 1583 *zil_hdl = zv->zv_zilog; 1584 *rl_hdl = &zv->zv_rangelock; 1585 *dnode_hdl = zv->zv_dn; 1586 return (0); 1587 } 1588 1589 /* 1590 * Return the current volume size to an external caller. 1591 * The size can change while the volume is open. 1592 */ 1593 uint64_t 1594 zvol_get_volume_size(void *minor_hdl) 1595 { 1596 zvol_state_t *zv = minor_hdl; 1597 1598 return (zv->zv_volsize); 1599 } 1600 1601 /* 1602 * Return the current WCE setting to an external caller. 1603 * The WCE setting can change while the volume is open. 1604 */ 1605 int 1606 zvol_get_volume_wce(void *minor_hdl) 1607 { 1608 zvol_state_t *zv = minor_hdl; 1609 1610 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 1611 } 1612 1613 /* 1614 * Entry point for external callers to zvol_log_write 1615 */ 1616 void 1617 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 1618 boolean_t sync) 1619 { 1620 zvol_state_t *zv = minor_hdl; 1621 1622 zvol_log_write(zv, tx, off, resid, sync); 1623 } 1624 /* 1625 * END entry points to allow external callers access to the volume. 1626 */ 1627 1628 /* 1629 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 1630 */ 1631 static void 1632 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 1633 boolean_t sync) 1634 { 1635 itx_t *itx; 1636 lr_truncate_t *lr; 1637 zilog_t *zilog = zv->zv_zilog; 1638 1639 if (zil_replaying(zilog, tx)) 1640 return; 1641 1642 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 1643 lr = (lr_truncate_t *)&itx->itx_lr; 1644 lr->lr_foid = ZVOL_OBJ; 1645 lr->lr_offset = off; 1646 lr->lr_length = len; 1647 1648 itx->itx_sync = sync; 1649 zil_itx_assign(zilog, itx, tx); 1650 } 1651 1652 /* 1653 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1654 * Also a dirtbag dkio ioctl for unmap/free-block functionality. 1655 */ 1656 /*ARGSUSED*/ 1657 int 1658 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1659 { 1660 zvol_state_t *zv; 1661 struct dk_callback *dkc; 1662 int i, error = 0; 1663 locked_range_t *lr; 1664 1665 mutex_enter(&zfsdev_state_lock); 1666 1667 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1668 1669 if (zv == NULL) { 1670 mutex_exit(&zfsdev_state_lock); 1671 return (SET_ERROR(ENXIO)); 1672 } 1673 ASSERT(zv->zv_total_opens > 0); 1674 1675 switch (cmd) { 1676 1677 case DKIOCINFO: 1678 { 1679 struct dk_cinfo dki; 1680 1681 bzero(&dki, sizeof (dki)); 1682 (void) strcpy(dki.dki_cname, "zvol"); 1683 (void) strcpy(dki.dki_dname, "zvol"); 1684 dki.dki_ctype = DKC_UNKNOWN; 1685 dki.dki_unit = getminor(dev); 1686 dki.dki_maxtransfer = 1687 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs); 1688 mutex_exit(&zfsdev_state_lock); 1689 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1690 error = SET_ERROR(EFAULT); 1691 return (error); 1692 } 1693 1694 case DKIOCGMEDIAINFO: 1695 { 1696 struct dk_minfo dkm; 1697 1698 bzero(&dkm, sizeof (dkm)); 1699 dkm.dki_lbsize = 1U << zv->zv_min_bs; 1700 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1701 dkm.dki_media_type = DK_UNKNOWN; 1702 mutex_exit(&zfsdev_state_lock); 1703 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1704 error = SET_ERROR(EFAULT); 1705 return (error); 1706 } 1707 1708 case DKIOCGMEDIAINFOEXT: 1709 { 1710 struct dk_minfo_ext dkmext; 1711 1712 bzero(&dkmext, sizeof (dkmext)); 1713 dkmext.dki_lbsize = 1U << zv->zv_min_bs; 1714 dkmext.dki_pbsize = zv->zv_volblocksize; 1715 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1716 dkmext.dki_media_type = DK_UNKNOWN; 1717 mutex_exit(&zfsdev_state_lock); 1718 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag)) 1719 error = SET_ERROR(EFAULT); 1720 return (error); 1721 } 1722 1723 case DKIOCGETEFI: 1724 { 1725 uint64_t vs = zv->zv_volsize; 1726 uint8_t bs = zv->zv_min_bs; 1727 1728 mutex_exit(&zfsdev_state_lock); 1729 error = zvol_getefi((void *)arg, flag, vs, bs); 1730 return (error); 1731 } 1732 1733 case DKIOCFLUSHWRITECACHE: 1734 dkc = (struct dk_callback *)arg; 1735 mutex_exit(&zfsdev_state_lock); 1736 1737 smt_begin_unsafe(); 1738 1739 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1740 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1741 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1742 error = 0; 1743 } 1744 1745 smt_end_unsafe(); 1746 1747 return (error); 1748 1749 case DKIOCGETWCE: 1750 { 1751 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1752 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1753 flag)) 1754 error = SET_ERROR(EFAULT); 1755 break; 1756 } 1757 case DKIOCSETWCE: 1758 { 1759 int wce; 1760 if (ddi_copyin((void *)arg, &wce, sizeof (int), 1761 flag)) { 1762 error = SET_ERROR(EFAULT); 1763 break; 1764 } 1765 if (wce) { 1766 zv->zv_flags |= ZVOL_WCE; 1767 mutex_exit(&zfsdev_state_lock); 1768 } else { 1769 zv->zv_flags &= ~ZVOL_WCE; 1770 mutex_exit(&zfsdev_state_lock); 1771 smt_begin_unsafe(); 1772 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1773 smt_end_unsafe(); 1774 } 1775 return (0); 1776 } 1777 1778 case DKIOCGGEOM: 1779 case DKIOCGVTOC: 1780 /* 1781 * commands using these (like prtvtoc) expect ENOTSUP 1782 * since we're emulating an EFI label 1783 */ 1784 error = SET_ERROR(ENOTSUP); 1785 break; 1786 1787 case DKIOCDUMPINIT: 1788 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1789 RL_WRITER); 1790 error = zvol_dumpify(zv); 1791 rangelock_exit(lr); 1792 break; 1793 1794 case DKIOCDUMPFINI: 1795 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 1796 break; 1797 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1798 RL_WRITER); 1799 error = zvol_dump_fini(zv); 1800 rangelock_exit(lr); 1801 break; 1802 1803 case DKIOCFREE: 1804 { 1805 dkioc_free_list_t *dfl; 1806 dmu_tx_t *tx; 1807 1808 if (!zvol_unmap_enabled) 1809 break; 1810 1811 if (!(flag & FKIOCTL)) { 1812 error = dfl_copyin((void *)arg, &dfl, flag, KM_SLEEP); 1813 if (error != 0) 1814 break; 1815 } else { 1816 dfl = (dkioc_free_list_t *)arg; 1817 ASSERT3U(dfl->dfl_num_exts, <=, DFL_COPYIN_MAX_EXTS); 1818 if (dfl->dfl_num_exts > DFL_COPYIN_MAX_EXTS) { 1819 error = SET_ERROR(EINVAL); 1820 break; 1821 } 1822 } 1823 1824 mutex_exit(&zfsdev_state_lock); 1825 1826 smt_begin_unsafe(); 1827 1828 for (int i = 0; i < dfl->dfl_num_exts; i++) { 1829 uint64_t start = dfl->dfl_exts[i].dfle_start, 1830 length = dfl->dfl_exts[i].dfle_length, 1831 end = start + length; 1832 1833 /* 1834 * Apply Postel's Law to length-checking. If they 1835 * overshoot, just blank out until the end, if there's 1836 * a need to blank out anything. 1837 */ 1838 if (start >= zv->zv_volsize) 1839 continue; /* No need to do anything... */ 1840 if (end > zv->zv_volsize) { 1841 end = DMU_OBJECT_END; 1842 length = end - start; 1843 } 1844 1845 lr = rangelock_enter(&zv->zv_rangelock, start, length, 1846 RL_WRITER); 1847 tx = dmu_tx_create(zv->zv_objset); 1848 error = dmu_tx_assign(tx, TXG_WAIT); 1849 if (error != 0) { 1850 dmu_tx_abort(tx); 1851 } else { 1852 zvol_log_truncate(zv, tx, start, length, 1853 B_TRUE); 1854 dmu_tx_commit(tx); 1855 error = dmu_free_long_range(zv->zv_objset, 1856 ZVOL_OBJ, start, length); 1857 } 1858 1859 rangelock_exit(lr); 1860 1861 if (error != 0) 1862 break; 1863 } 1864 1865 /* 1866 * If the write-cache is disabled, 'sync' property 1867 * is set to 'always', or if the caller is asking for 1868 * a synchronous free, commit this operation to the zil. 1869 * This will sync any previous uncommitted writes to the 1870 * zvol object. 1871 * Can be overridden by the zvol_unmap_sync_enabled tunable. 1872 */ 1873 if ((error == 0) && zvol_unmap_sync_enabled && 1874 (!(zv->zv_flags & ZVOL_WCE) || 1875 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) || 1876 (dfl->dfl_flags & DF_WAIT_SYNC))) { 1877 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1878 } 1879 1880 if (!(flag & FKIOCTL)) 1881 dfl_free(dfl); 1882 1883 smt_end_unsafe(); 1884 1885 return (error); 1886 } 1887 1888 case DKIOC_CANFREE: 1889 i = zvol_unmap_enabled ? 1 : 0; 1890 if (ddi_copyout(&i, (void *)arg, sizeof (int), flag) != 0) { 1891 error = EFAULT; 1892 } else { 1893 error = 0; 1894 } 1895 break; 1896 1897 default: 1898 error = SET_ERROR(ENOTTY); 1899 break; 1900 1901 } 1902 mutex_exit(&zfsdev_state_lock); 1903 return (error); 1904 } 1905 1906 int 1907 zvol_busy(void) 1908 { 1909 return (zvol_minors != 0); 1910 } 1911 1912 void 1913 zvol_init(void) 1914 { 1915 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1916 1) == 0); 1917 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1918 } 1919 1920 void 1921 zvol_fini(void) 1922 { 1923 mutex_destroy(&zfsdev_state_lock); 1924 ddi_soft_state_fini(&zfsdev_state); 1925 } 1926 1927 /*ARGSUSED*/ 1928 static int 1929 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx) 1930 { 1931 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1932 1933 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1934 return (1); 1935 return (0); 1936 } 1937 1938 /*ARGSUSED*/ 1939 static void 1940 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx) 1941 { 1942 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1943 1944 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx); 1945 } 1946 1947 static int 1948 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1949 { 1950 dmu_tx_t *tx; 1951 int error; 1952 objset_t *os = zv->zv_objset; 1953 spa_t *spa = dmu_objset_spa(os); 1954 vdev_t *vd = spa->spa_root_vdev; 1955 nvlist_t *nv = NULL; 1956 uint64_t version = spa_version(spa); 1957 uint64_t checksum, compress, refresrv, vbs, dedup; 1958 1959 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1960 ASSERT(vd->vdev_ops == &vdev_root_ops); 1961 1962 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1963 DMU_OBJECT_END); 1964 if (error != 0) 1965 return (error); 1966 /* wait for dmu_free_long_range to actually free the blocks */ 1967 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1968 1969 /* 1970 * If the pool on which the dump device is being initialized has more 1971 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is 1972 * enabled. If so, bump that feature's counter to indicate that the 1973 * feature is active. We also check the vdev type to handle the 1974 * following case: 1975 * # zpool create test raidz disk1 disk2 disk3 1976 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev), 1977 * the raidz vdev itself has 3 children. 1978 */ 1979 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) { 1980 if (!spa_feature_is_enabled(spa, 1981 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1982 return (SET_ERROR(ENOTSUP)); 1983 (void) dsl_sync_task(spa_name(spa), 1984 zfs_mvdev_dump_feature_check, 1985 zfs_mvdev_dump_activate_feature_sync, NULL, 1986 2, ZFS_SPACE_CHECK_RESERVED); 1987 } 1988 1989 if (!resize) { 1990 error = dsl_prop_get_integer(zv->zv_name, 1991 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1992 if (error == 0) { 1993 error = dsl_prop_get_integer(zv->zv_name, 1994 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, 1995 NULL); 1996 } 1997 if (error == 0) { 1998 error = dsl_prop_get_integer(zv->zv_name, 1999 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2000 &refresrv, NULL); 2001 } 2002 if (error == 0) { 2003 error = dsl_prop_get_integer(zv->zv_name, 2004 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, 2005 NULL); 2006 } 2007 if (version >= SPA_VERSION_DEDUP && error == 0) { 2008 error = dsl_prop_get_integer(zv->zv_name, 2009 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 2010 } 2011 } 2012 if (error != 0) 2013 return (error); 2014 2015 tx = dmu_tx_create(os); 2016 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2017 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2018 error = dmu_tx_assign(tx, TXG_WAIT); 2019 if (error != 0) { 2020 dmu_tx_abort(tx); 2021 return (error); 2022 } 2023 2024 /* 2025 * If we are resizing the dump device then we only need to 2026 * update the refreservation to match the newly updated 2027 * zvolsize. Otherwise, we save off the original state of the 2028 * zvol so that we can restore them if the zvol is ever undumpified. 2029 */ 2030 if (resize) { 2031 error = zap_update(os, ZVOL_ZAP_OBJ, 2032 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2033 &zv->zv_volsize, tx); 2034 } else { 2035 error = zap_update(os, ZVOL_ZAP_OBJ, 2036 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 2037 &compress, tx); 2038 if (error == 0) { 2039 error = zap_update(os, ZVOL_ZAP_OBJ, 2040 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, 2041 &checksum, tx); 2042 } 2043 if (error == 0) { 2044 error = zap_update(os, ZVOL_ZAP_OBJ, 2045 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2046 &refresrv, tx); 2047 } 2048 if (error == 0) { 2049 error = zap_update(os, ZVOL_ZAP_OBJ, 2050 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 2051 &vbs, tx); 2052 } 2053 if (error == 0) { 2054 error = dmu_object_set_blocksize( 2055 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx); 2056 } 2057 if (version >= SPA_VERSION_DEDUP && error == 0) { 2058 error = zap_update(os, ZVOL_ZAP_OBJ, 2059 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 2060 &dedup, tx); 2061 } 2062 if (error == 0) 2063 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE; 2064 } 2065 dmu_tx_commit(tx); 2066 2067 /* 2068 * We only need update the zvol's property if we are initializing 2069 * the dump area for the first time. 2070 */ 2071 if (error == 0 && !resize) { 2072 /* 2073 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum 2074 * function. Otherwise, use the old default -- OFF. 2075 */ 2076 checksum = spa_feature_is_active(spa, 2077 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY : 2078 ZIO_CHECKSUM_OFF; 2079 2080 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2081 VERIFY(nvlist_add_uint64(nv, 2082 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 2083 VERIFY(nvlist_add_uint64(nv, 2084 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 2085 ZIO_COMPRESS_OFF) == 0); 2086 VERIFY(nvlist_add_uint64(nv, 2087 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 2088 checksum) == 0); 2089 if (version >= SPA_VERSION_DEDUP) { 2090 VERIFY(nvlist_add_uint64(nv, 2091 zfs_prop_to_name(ZFS_PROP_DEDUP), 2092 ZIO_CHECKSUM_OFF) == 0); 2093 } 2094 2095 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2096 nv, NULL); 2097 nvlist_free(nv); 2098 } 2099 2100 /* Allocate the space for the dump */ 2101 if (error == 0) 2102 error = zvol_prealloc(zv); 2103 return (error); 2104 } 2105 2106 static int 2107 zvol_dumpify(zvol_state_t *zv) 2108 { 2109 int error = 0; 2110 uint64_t dumpsize = 0; 2111 dmu_tx_t *tx; 2112 objset_t *os = zv->zv_objset; 2113 2114 if (zv->zv_flags & ZVOL_RDONLY) 2115 return (SET_ERROR(EROFS)); 2116 2117 if (os->os_encrypted) 2118 return (SET_ERROR(ENOTSUP)); 2119 2120 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 2121 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 2122 boolean_t resize = (dumpsize > 0); 2123 2124 if ((error = zvol_dump_init(zv, resize)) != 0) { 2125 (void) zvol_dump_fini(zv); 2126 return (error); 2127 } 2128 } 2129 2130 /* 2131 * Build up our lba mapping. 2132 */ 2133 error = zvol_get_lbas(zv); 2134 if (error) { 2135 (void) zvol_dump_fini(zv); 2136 return (error); 2137 } 2138 2139 tx = dmu_tx_create(os); 2140 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2141 error = dmu_tx_assign(tx, TXG_WAIT); 2142 if (error) { 2143 dmu_tx_abort(tx); 2144 (void) zvol_dump_fini(zv); 2145 return (error); 2146 } 2147 2148 zv->zv_flags |= ZVOL_DUMPIFIED; 2149 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 2150 &zv->zv_volsize, tx); 2151 dmu_tx_commit(tx); 2152 2153 if (error) { 2154 (void) zvol_dump_fini(zv); 2155 return (error); 2156 } 2157 2158 txg_wait_synced(dmu_objset_pool(os), 0); 2159 return (0); 2160 } 2161 2162 static int 2163 zvol_dump_fini(zvol_state_t *zv) 2164 { 2165 dmu_tx_t *tx; 2166 objset_t *os = zv->zv_objset; 2167 nvlist_t *nv; 2168 int error = 0; 2169 uint64_t checksum, compress, refresrv, vbs, dedup; 2170 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 2171 2172 /* 2173 * Attempt to restore the zvol back to its pre-dumpified state. 2174 * This is a best-effort attempt as it's possible that not all 2175 * of these properties were initialized during the dumpify process 2176 * (i.e. error during zvol_dump_init). 2177 */ 2178 2179 tx = dmu_tx_create(os); 2180 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2181 error = dmu_tx_assign(tx, TXG_WAIT); 2182 if (error) { 2183 dmu_tx_abort(tx); 2184 return (error); 2185 } 2186 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 2187 dmu_tx_commit(tx); 2188 2189 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2190 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 2191 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2192 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 2193 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2194 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 2195 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2196 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 2197 2198 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2199 (void) nvlist_add_uint64(nv, 2200 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 2201 (void) nvlist_add_uint64(nv, 2202 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 2203 (void) nvlist_add_uint64(nv, 2204 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 2205 if (version >= SPA_VERSION_DEDUP && 2206 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2207 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 2208 (void) nvlist_add_uint64(nv, 2209 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 2210 } 2211 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2212 nv, NULL); 2213 nvlist_free(nv); 2214 2215 zvol_free_extents(zv); 2216 zv->zv_flags &= ~ZVOL_DUMPIFIED; 2217 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2218 /* wait for dmu_free_long_range to actually free the blocks */ 2219 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2220 tx = dmu_tx_create(os); 2221 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2222 error = dmu_tx_assign(tx, TXG_WAIT); 2223 if (error) { 2224 dmu_tx_abort(tx); 2225 return (error); 2226 } 2227 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2228 zv->zv_volblocksize = vbs; 2229 dmu_tx_commit(tx); 2230 2231 return (0); 2232 } 2233