1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23 * 24 * Portions Copyright 2010 Robert Milkowski 25 * 26 * Copyright 2017 Nexenta Systems, Inc. All rights reserved. 27 * Copyright (c) 2012, 2017 by Delphix. All rights reserved. 28 * Copyright (c) 2013, Joyent, Inc. All rights reserved. 29 * Copyright (c) 2014 Integros [integros.com] 30 */ 31 32 /* 33 * ZFS volume emulation driver. 34 * 35 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 36 * Volumes are accessed through the symbolic links named: 37 * 38 * /dev/zvol/dsk/<pool_name>/<dataset_name> 39 * /dev/zvol/rdsk/<pool_name>/<dataset_name> 40 * 41 * These links are created by the /dev filesystem (sdev_zvolops.c). 42 * Volumes are persistent through reboot. No user command needs to be 43 * run before opening and using a device. 44 */ 45 46 #include <sys/types.h> 47 #include <sys/param.h> 48 #include <sys/errno.h> 49 #include <sys/uio.h> 50 #include <sys/buf.h> 51 #include <sys/modctl.h> 52 #include <sys/open.h> 53 #include <sys/kmem.h> 54 #include <sys/conf.h> 55 #include <sys/cmn_err.h> 56 #include <sys/stat.h> 57 #include <sys/zap.h> 58 #include <sys/spa.h> 59 #include <sys/spa_impl.h> 60 #include <sys/zio.h> 61 #include <sys/dmu_traverse.h> 62 #include <sys/dnode.h> 63 #include <sys/dsl_dataset.h> 64 #include <sys/dsl_prop.h> 65 #include <sys/dkio.h> 66 #include <sys/efi_partition.h> 67 #include <sys/byteorder.h> 68 #include <sys/pathname.h> 69 #include <sys/ddi.h> 70 #include <sys/sunddi.h> 71 #include <sys/crc32.h> 72 #include <sys/dirent.h> 73 #include <sys/policy.h> 74 #include <sys/fs/zfs.h> 75 #include <sys/zfs_ioctl.h> 76 #include <sys/mkdev.h> 77 #include <sys/zil.h> 78 #include <sys/refcount.h> 79 #include <sys/zfs_znode.h> 80 #include <sys/zfs_rlock.h> 81 #include <sys/vdev_disk.h> 82 #include <sys/vdev_impl.h> 83 #include <sys/vdev_raidz.h> 84 #include <sys/zvol.h> 85 #include <sys/dumphdr.h> 86 #include <sys/zil_impl.h> 87 #include <sys/dbuf.h> 88 #include <sys/dmu_tx.h> 89 #include <sys/zfeature.h> 90 #include <sys/zio_checksum.h> 91 #include <sys/zil_impl.h> 92 #include <sys/dkioc_free_util.h> 93 #include <sys/zfs_rlock.h> 94 95 #include "zfs_namecheck.h" 96 97 void *zfsdev_state; 98 static char *zvol_tag = "zvol_tag"; 99 100 #define ZVOL_DUMPSIZE "dumpsize" 101 102 /* 103 * This lock protects the zfsdev_state structure from being modified 104 * while it's being used, e.g. an open that comes in before a create 105 * finishes. It also protects temporary opens of the dataset so that, 106 * e.g., an open doesn't get a spurious EBUSY. 107 */ 108 kmutex_t zfsdev_state_lock; 109 static uint32_t zvol_minors; 110 111 typedef struct zvol_extent { 112 list_node_t ze_node; 113 dva_t ze_dva; /* dva associated with this extent */ 114 uint64_t ze_nblks; /* number of blocks in extent */ 115 } zvol_extent_t; 116 117 /* 118 * The in-core state of each volume. 119 */ 120 typedef struct zvol_state { 121 char zv_name[MAXPATHLEN]; /* pool/dd name */ 122 uint64_t zv_volsize; /* amount of space we advertise */ 123 uint64_t zv_volblocksize; /* volume block size */ 124 minor_t zv_minor; /* minor number */ 125 uint8_t zv_min_bs; /* minimum addressable block shift */ 126 uint8_t zv_flags; /* readonly, dumpified, etc. */ 127 objset_t *zv_objset; /* objset handle */ 128 uint32_t zv_open_count[OTYPCNT]; /* open counts */ 129 uint32_t zv_total_opens; /* total open count */ 130 zilog_t *zv_zilog; /* ZIL handle */ 131 list_t zv_extents; /* List of extents for dump */ 132 rangelock_t zv_rangelock; 133 dnode_t *zv_dn; /* dnode hold */ 134 } zvol_state_t; 135 136 /* 137 * zvol specific flags 138 */ 139 #define ZVOL_RDONLY 0x1 140 #define ZVOL_DUMPIFIED 0x2 141 #define ZVOL_EXCL 0x4 142 #define ZVOL_WCE 0x8 143 144 /* 145 * zvol maximum transfer in one DMU tx. 146 */ 147 int zvol_maxphys = DMU_MAX_ACCESS/2; 148 149 /* 150 * Toggle unmap functionality. 151 */ 152 boolean_t zvol_unmap_enabled = B_TRUE; 153 154 /* 155 * If true, unmaps requested as synchronous are executed synchronously, 156 * otherwise all unmaps are asynchronous. 157 */ 158 boolean_t zvol_unmap_sync_enabled = B_FALSE; 159 160 extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 161 nvlist_t *, nvlist_t *); 162 static int zvol_remove_zv(zvol_state_t *); 163 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, 164 struct lwb *lwb, zio_t *zio); 165 static int zvol_dumpify(zvol_state_t *zv); 166 static int zvol_dump_fini(zvol_state_t *zv); 167 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 168 169 static void 170 zvol_size_changed(zvol_state_t *zv, uint64_t volsize) 171 { 172 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor); 173 174 zv->zv_volsize = volsize; 175 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 176 "Size", volsize) == DDI_SUCCESS); 177 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 178 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 179 180 /* Notify specfs to invalidate the cached size */ 181 spec_size_invalidate(dev, VBLK); 182 spec_size_invalidate(dev, VCHR); 183 } 184 185 int 186 zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 187 { 188 if (volsize == 0) 189 return (SET_ERROR(EINVAL)); 190 191 if (volsize % blocksize != 0) 192 return (SET_ERROR(EINVAL)); 193 194 #ifdef _ILP32 195 if (volsize - 1 > SPEC_MAXOFFSET_T) 196 return (SET_ERROR(EOVERFLOW)); 197 #endif 198 return (0); 199 } 200 201 int 202 zvol_check_volblocksize(uint64_t volblocksize) 203 { 204 if (volblocksize < SPA_MINBLOCKSIZE || 205 volblocksize > SPA_OLD_MAXBLOCKSIZE || 206 !ISP2(volblocksize)) 207 return (SET_ERROR(EDOM)); 208 209 return (0); 210 } 211 212 int 213 zvol_get_stats(objset_t *os, nvlist_t *nv) 214 { 215 int error; 216 dmu_object_info_t doi; 217 uint64_t val; 218 219 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 220 if (error) 221 return (error); 222 223 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 224 225 error = dmu_object_info(os, ZVOL_OBJ, &doi); 226 227 if (error == 0) { 228 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 229 doi.doi_data_block_size); 230 } 231 232 return (error); 233 } 234 235 static zvol_state_t * 236 zvol_minor_lookup(const char *name) 237 { 238 minor_t minor; 239 zvol_state_t *zv; 240 241 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 242 243 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 244 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 245 if (zv == NULL) 246 continue; 247 if (strcmp(zv->zv_name, name) == 0) 248 return (zv); 249 } 250 251 return (NULL); 252 } 253 254 /* extent mapping arg */ 255 struct maparg { 256 zvol_state_t *ma_zv; 257 uint64_t ma_blks; 258 }; 259 260 /*ARGSUSED*/ 261 static int 262 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 263 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 264 { 265 struct maparg *ma = arg; 266 zvol_extent_t *ze; 267 int bs = ma->ma_zv->zv_volblocksize; 268 269 if (bp == NULL || BP_IS_HOLE(bp) || 270 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 271 return (0); 272 273 VERIFY(!BP_IS_EMBEDDED(bp)); 274 275 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 276 ma->ma_blks++; 277 278 /* Abort immediately if we have encountered gang blocks */ 279 if (BP_IS_GANG(bp)) 280 return (SET_ERROR(EFRAGS)); 281 282 /* 283 * See if the block is at the end of the previous extent. 284 */ 285 ze = list_tail(&ma->ma_zv->zv_extents); 286 if (ze && 287 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 288 DVA_GET_OFFSET(BP_IDENTITY(bp)) == 289 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 290 ze->ze_nblks++; 291 return (0); 292 } 293 294 dprintf_bp(bp, "%s", "next blkptr:"); 295 296 /* start a new extent */ 297 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 298 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 299 ze->ze_nblks = 1; 300 list_insert_tail(&ma->ma_zv->zv_extents, ze); 301 return (0); 302 } 303 304 static void 305 zvol_free_extents(zvol_state_t *zv) 306 { 307 zvol_extent_t *ze; 308 309 while (ze = list_head(&zv->zv_extents)) { 310 list_remove(&zv->zv_extents, ze); 311 kmem_free(ze, sizeof (zvol_extent_t)); 312 } 313 } 314 315 static int 316 zvol_get_lbas(zvol_state_t *zv) 317 { 318 objset_t *os = zv->zv_objset; 319 struct maparg ma; 320 int err; 321 322 ma.ma_zv = zv; 323 ma.ma_blks = 0; 324 zvol_free_extents(zv); 325 326 /* commit any in-flight changes before traversing the dataset */ 327 txg_wait_synced(dmu_objset_pool(os), 0); 328 err = traverse_dataset(dmu_objset_ds(os), 0, 329 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 330 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 331 zvol_free_extents(zv); 332 return (err ? err : EIO); 333 } 334 335 return (0); 336 } 337 338 /* ARGSUSED */ 339 void 340 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 341 { 342 zfs_creat_t *zct = arg; 343 nvlist_t *nvprops = zct->zct_props; 344 int error; 345 uint64_t volblocksize, volsize; 346 347 VERIFY(nvlist_lookup_uint64(nvprops, 348 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 349 if (nvlist_lookup_uint64(nvprops, 350 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 351 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 352 353 /* 354 * These properties must be removed from the list so the generic 355 * property setting step won't apply to them. 356 */ 357 VERIFY(nvlist_remove_all(nvprops, 358 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 359 (void) nvlist_remove_all(nvprops, 360 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 361 362 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 363 DMU_OT_NONE, 0, tx); 364 ASSERT(error == 0); 365 366 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 367 DMU_OT_NONE, 0, tx); 368 ASSERT(error == 0); 369 370 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 371 ASSERT(error == 0); 372 } 373 374 /* 375 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 376 * implement DKIOCFREE/free-long-range. 377 */ 378 static int 379 zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap) 380 { 381 zvol_state_t *zv = arg1; 382 lr_truncate_t *lr = arg2; 383 uint64_t offset, length; 384 385 if (byteswap) 386 byteswap_uint64_array(lr, sizeof (*lr)); 387 388 offset = lr->lr_offset; 389 length = lr->lr_length; 390 391 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 392 } 393 394 /* 395 * Replay a TX_WRITE ZIL transaction that didn't get committed 396 * after a system failure 397 */ 398 static int 399 zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap) 400 { 401 zvol_state_t *zv = arg1; 402 lr_write_t *lr = arg2; 403 objset_t *os = zv->zv_objset; 404 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 405 uint64_t offset, length; 406 dmu_tx_t *tx; 407 int error; 408 409 if (byteswap) 410 byteswap_uint64_array(lr, sizeof (*lr)); 411 412 offset = lr->lr_offset; 413 length = lr->lr_length; 414 415 /* If it's a dmu_sync() block, write the whole block */ 416 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 417 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 418 if (length < blocksize) { 419 offset -= offset % blocksize; 420 length = blocksize; 421 } 422 } 423 424 tx = dmu_tx_create(os); 425 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 426 error = dmu_tx_assign(tx, TXG_WAIT); 427 if (error) { 428 dmu_tx_abort(tx); 429 } else { 430 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 431 dmu_tx_commit(tx); 432 } 433 434 return (error); 435 } 436 437 /* ARGSUSED */ 438 static int 439 zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap) 440 { 441 return (SET_ERROR(ENOTSUP)); 442 } 443 444 /* 445 * Callback vectors for replaying records. 446 * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 447 */ 448 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 449 zvol_replay_err, /* 0 no such transaction type */ 450 zvol_replay_err, /* TX_CREATE */ 451 zvol_replay_err, /* TX_MKDIR */ 452 zvol_replay_err, /* TX_MKXATTR */ 453 zvol_replay_err, /* TX_SYMLINK */ 454 zvol_replay_err, /* TX_REMOVE */ 455 zvol_replay_err, /* TX_RMDIR */ 456 zvol_replay_err, /* TX_LINK */ 457 zvol_replay_err, /* TX_RENAME */ 458 zvol_replay_write, /* TX_WRITE */ 459 zvol_replay_truncate, /* TX_TRUNCATE */ 460 zvol_replay_err, /* TX_SETATTR */ 461 zvol_replay_err, /* TX_ACL */ 462 zvol_replay_err, /* TX_CREATE_ACL */ 463 zvol_replay_err, /* TX_CREATE_ATTR */ 464 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 465 zvol_replay_err, /* TX_MKDIR_ACL */ 466 zvol_replay_err, /* TX_MKDIR_ATTR */ 467 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 468 zvol_replay_err, /* TX_WRITE2 */ 469 }; 470 471 int 472 zvol_name2minor(const char *name, minor_t *minor) 473 { 474 zvol_state_t *zv; 475 476 mutex_enter(&zfsdev_state_lock); 477 zv = zvol_minor_lookup(name); 478 if (minor && zv) 479 *minor = zv->zv_minor; 480 mutex_exit(&zfsdev_state_lock); 481 return (zv ? 0 : -1); 482 } 483 484 /* 485 * Create a minor node (plus a whole lot more) for the specified volume. 486 */ 487 int 488 zvol_create_minor(const char *name) 489 { 490 zfs_soft_state_t *zs; 491 zvol_state_t *zv; 492 objset_t *os; 493 dmu_object_info_t doi; 494 minor_t minor = 0; 495 char chrbuf[30], blkbuf[30]; 496 int error; 497 498 mutex_enter(&zfsdev_state_lock); 499 500 if (zvol_minor_lookup(name) != NULL) { 501 mutex_exit(&zfsdev_state_lock); 502 return (SET_ERROR(EEXIST)); 503 } 504 505 /* lie and say we're read-only */ 506 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); 507 508 if (error) { 509 mutex_exit(&zfsdev_state_lock); 510 return (error); 511 } 512 513 if ((minor = zfsdev_minor_alloc()) == 0) { 514 dmu_objset_disown(os, FTAG); 515 mutex_exit(&zfsdev_state_lock); 516 return (SET_ERROR(ENXIO)); 517 } 518 519 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 520 dmu_objset_disown(os, FTAG); 521 mutex_exit(&zfsdev_state_lock); 522 return (SET_ERROR(EAGAIN)); 523 } 524 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 525 (char *)name); 526 527 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 528 529 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 530 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 531 ddi_soft_state_free(zfsdev_state, minor); 532 dmu_objset_disown(os, FTAG); 533 mutex_exit(&zfsdev_state_lock); 534 return (SET_ERROR(EAGAIN)); 535 } 536 537 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 538 539 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 540 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 541 ddi_remove_minor_node(zfs_dip, chrbuf); 542 ddi_soft_state_free(zfsdev_state, minor); 543 dmu_objset_disown(os, FTAG); 544 mutex_exit(&zfsdev_state_lock); 545 return (SET_ERROR(EAGAIN)); 546 } 547 548 zs = ddi_get_soft_state(zfsdev_state, minor); 549 zs->zss_type = ZSST_ZVOL; 550 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 551 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 552 zv->zv_min_bs = DEV_BSHIFT; 553 zv->zv_minor = minor; 554 zv->zv_objset = os; 555 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 556 zv->zv_flags |= ZVOL_RDONLY; 557 rangelock_init(&zv->zv_rangelock, NULL, NULL); 558 list_create(&zv->zv_extents, sizeof (zvol_extent_t), 559 offsetof(zvol_extent_t, ze_node)); 560 /* get and cache the blocksize */ 561 error = dmu_object_info(os, ZVOL_OBJ, &doi); 562 ASSERT(error == 0); 563 zv->zv_volblocksize = doi.doi_data_block_size; 564 565 if (spa_writeable(dmu_objset_spa(os))) { 566 if (zil_replay_disable) 567 zil_destroy(dmu_objset_zil(os), B_FALSE); 568 else 569 zil_replay(os, zv, zvol_replay_vector); 570 } 571 dmu_objset_disown(os, FTAG); 572 zv->zv_objset = NULL; 573 574 zvol_minors++; 575 576 mutex_exit(&zfsdev_state_lock); 577 578 return (0); 579 } 580 581 /* 582 * Remove minor node for the specified volume. 583 */ 584 static int 585 zvol_remove_zv(zvol_state_t *zv) 586 { 587 char nmbuf[20]; 588 minor_t minor = zv->zv_minor; 589 590 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 591 if (zv->zv_total_opens != 0) 592 return (SET_ERROR(EBUSY)); 593 594 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 595 ddi_remove_minor_node(zfs_dip, nmbuf); 596 597 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 598 ddi_remove_minor_node(zfs_dip, nmbuf); 599 600 rangelock_fini(&zv->zv_rangelock); 601 602 kmem_free(zv, sizeof (zvol_state_t)); 603 604 ddi_soft_state_free(zfsdev_state, minor); 605 606 zvol_minors--; 607 return (0); 608 } 609 610 int 611 zvol_remove_minor(const char *name) 612 { 613 zvol_state_t *zv; 614 int rc; 615 616 mutex_enter(&zfsdev_state_lock); 617 if ((zv = zvol_minor_lookup(name)) == NULL) { 618 mutex_exit(&zfsdev_state_lock); 619 return (SET_ERROR(ENXIO)); 620 } 621 rc = zvol_remove_zv(zv); 622 mutex_exit(&zfsdev_state_lock); 623 return (rc); 624 } 625 626 int 627 zvol_first_open(zvol_state_t *zv) 628 { 629 objset_t *os; 630 uint64_t volsize; 631 int error; 632 uint64_t readonly; 633 634 /* lie and say we're read-only */ 635 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 636 zvol_tag, &os); 637 if (error) 638 return (error); 639 640 zv->zv_objset = os; 641 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 642 if (error) { 643 ASSERT(error == 0); 644 dmu_objset_disown(os, zvol_tag); 645 return (error); 646 } 647 648 error = dnode_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dn); 649 if (error) { 650 dmu_objset_disown(os, zvol_tag); 651 return (error); 652 } 653 654 zvol_size_changed(zv, volsize); 655 zv->zv_zilog = zil_open(os, zvol_get_data); 656 657 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 658 NULL) == 0); 659 if (readonly || dmu_objset_is_snapshot(os) || 660 !spa_writeable(dmu_objset_spa(os))) 661 zv->zv_flags |= ZVOL_RDONLY; 662 else 663 zv->zv_flags &= ~ZVOL_RDONLY; 664 return (error); 665 } 666 667 void 668 zvol_last_close(zvol_state_t *zv) 669 { 670 zil_close(zv->zv_zilog); 671 zv->zv_zilog = NULL; 672 673 dnode_rele(zv->zv_dn, zvol_tag); 674 zv->zv_dn = NULL; 675 676 /* 677 * Evict cached data 678 */ 679 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && 680 !(zv->zv_flags & ZVOL_RDONLY)) 681 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 682 dmu_objset_evict_dbufs(zv->zv_objset); 683 684 dmu_objset_disown(zv->zv_objset, zvol_tag); 685 zv->zv_objset = NULL; 686 } 687 688 int 689 zvol_prealloc(zvol_state_t *zv) 690 { 691 objset_t *os = zv->zv_objset; 692 dmu_tx_t *tx; 693 uint64_t refd, avail, usedobjs, availobjs; 694 uint64_t resid = zv->zv_volsize; 695 uint64_t off = 0; 696 697 /* Check the space usage before attempting to allocate the space */ 698 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 699 if (avail < zv->zv_volsize) 700 return (SET_ERROR(ENOSPC)); 701 702 /* Free old extents if they exist */ 703 zvol_free_extents(zv); 704 705 while (resid != 0) { 706 int error; 707 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE); 708 709 tx = dmu_tx_create(os); 710 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 711 error = dmu_tx_assign(tx, TXG_WAIT); 712 if (error) { 713 dmu_tx_abort(tx); 714 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 715 return (error); 716 } 717 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 718 dmu_tx_commit(tx); 719 off += bytes; 720 resid -= bytes; 721 } 722 txg_wait_synced(dmu_objset_pool(os), 0); 723 724 return (0); 725 } 726 727 static int 728 zvol_update_volsize(objset_t *os, uint64_t volsize) 729 { 730 dmu_tx_t *tx; 731 int error; 732 733 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 734 735 tx = dmu_tx_create(os); 736 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 737 dmu_tx_mark_netfree(tx); 738 error = dmu_tx_assign(tx, TXG_WAIT); 739 if (error) { 740 dmu_tx_abort(tx); 741 return (error); 742 } 743 744 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 745 &volsize, tx); 746 dmu_tx_commit(tx); 747 748 if (error == 0) 749 error = dmu_free_long_range(os, 750 ZVOL_OBJ, volsize, DMU_OBJECT_END); 751 return (error); 752 } 753 754 void 755 zvol_remove_minors(const char *name) 756 { 757 zvol_state_t *zv; 758 char *namebuf; 759 minor_t minor; 760 761 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 762 (void) strncpy(namebuf, name, strlen(name)); 763 (void) strcat(namebuf, "/"); 764 mutex_enter(&zfsdev_state_lock); 765 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 766 767 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 768 if (zv == NULL) 769 continue; 770 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 771 (void) zvol_remove_zv(zv); 772 } 773 kmem_free(namebuf, strlen(name) + 2); 774 775 mutex_exit(&zfsdev_state_lock); 776 } 777 778 static int 779 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) 780 { 781 uint64_t old_volsize = 0ULL; 782 int error = 0; 783 784 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 785 786 /* 787 * Reinitialize the dump area to the new size. If we 788 * failed to resize the dump area then restore it back to 789 * its original size. We must set the new volsize prior 790 * to calling dumpvp_resize() to ensure that the devices' 791 * size(9P) is not visible by the dump subsystem. 792 */ 793 old_volsize = zv->zv_volsize; 794 zvol_size_changed(zv, volsize); 795 796 if (zv->zv_flags & ZVOL_DUMPIFIED) { 797 if ((error = zvol_dumpify(zv)) != 0 || 798 (error = dumpvp_resize()) != 0) { 799 int dumpify_error; 800 801 (void) zvol_update_volsize(zv->zv_objset, old_volsize); 802 zvol_size_changed(zv, old_volsize); 803 dumpify_error = zvol_dumpify(zv); 804 error = dumpify_error ? dumpify_error : error; 805 } 806 } 807 808 /* 809 * Generate a LUN expansion event. 810 */ 811 if (error == 0) { 812 sysevent_id_t eid; 813 nvlist_t *attr; 814 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 815 816 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 817 zv->zv_minor); 818 819 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 820 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 821 822 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 823 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 824 825 nvlist_free(attr); 826 kmem_free(physpath, MAXPATHLEN); 827 } 828 return (error); 829 } 830 831 int 832 zvol_set_volsize(const char *name, uint64_t volsize) 833 { 834 zvol_state_t *zv = NULL; 835 objset_t *os; 836 int error; 837 dmu_object_info_t doi; 838 uint64_t readonly; 839 boolean_t owned = B_FALSE; 840 841 error = dsl_prop_get_integer(name, 842 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); 843 if (error != 0) 844 return (error); 845 if (readonly) 846 return (SET_ERROR(EROFS)); 847 848 mutex_enter(&zfsdev_state_lock); 849 zv = zvol_minor_lookup(name); 850 851 if (zv == NULL || zv->zv_objset == NULL) { 852 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, 853 FTAG, &os)) != 0) { 854 mutex_exit(&zfsdev_state_lock); 855 return (error); 856 } 857 owned = B_TRUE; 858 if (zv != NULL) 859 zv->zv_objset = os; 860 } else { 861 os = zv->zv_objset; 862 } 863 864 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 865 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0) 866 goto out; 867 868 error = zvol_update_volsize(os, volsize); 869 870 if (error == 0 && zv != NULL) 871 error = zvol_update_live_volsize(zv, volsize); 872 out: 873 if (owned) { 874 dmu_objset_disown(os, FTAG); 875 if (zv != NULL) 876 zv->zv_objset = NULL; 877 } 878 mutex_exit(&zfsdev_state_lock); 879 return (error); 880 } 881 882 /*ARGSUSED*/ 883 int 884 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 885 { 886 zvol_state_t *zv; 887 int err = 0; 888 889 mutex_enter(&zfsdev_state_lock); 890 891 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 892 if (zv == NULL) { 893 mutex_exit(&zfsdev_state_lock); 894 return (SET_ERROR(ENXIO)); 895 } 896 897 if (zv->zv_total_opens == 0) 898 err = zvol_first_open(zv); 899 if (err) { 900 mutex_exit(&zfsdev_state_lock); 901 return (err); 902 } 903 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 904 err = SET_ERROR(EROFS); 905 goto out; 906 } 907 if (zv->zv_flags & ZVOL_EXCL) { 908 err = SET_ERROR(EBUSY); 909 goto out; 910 } 911 if (flag & FEXCL) { 912 if (zv->zv_total_opens != 0) { 913 err = SET_ERROR(EBUSY); 914 goto out; 915 } 916 zv->zv_flags |= ZVOL_EXCL; 917 } 918 919 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 920 zv->zv_open_count[otyp]++; 921 zv->zv_total_opens++; 922 } 923 mutex_exit(&zfsdev_state_lock); 924 925 return (err); 926 out: 927 if (zv->zv_total_opens == 0) 928 zvol_last_close(zv); 929 mutex_exit(&zfsdev_state_lock); 930 return (err); 931 } 932 933 /*ARGSUSED*/ 934 int 935 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 936 { 937 minor_t minor = getminor(dev); 938 zvol_state_t *zv; 939 int error = 0; 940 941 mutex_enter(&zfsdev_state_lock); 942 943 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 944 if (zv == NULL) { 945 mutex_exit(&zfsdev_state_lock); 946 return (SET_ERROR(ENXIO)); 947 } 948 949 if (zv->zv_flags & ZVOL_EXCL) { 950 ASSERT(zv->zv_total_opens == 1); 951 zv->zv_flags &= ~ZVOL_EXCL; 952 } 953 954 /* 955 * If the open count is zero, this is a spurious close. 956 * That indicates a bug in the kernel / DDI framework. 957 */ 958 ASSERT(zv->zv_open_count[otyp] != 0); 959 ASSERT(zv->zv_total_opens != 0); 960 961 /* 962 * You may get multiple opens, but only one close. 963 */ 964 zv->zv_open_count[otyp]--; 965 zv->zv_total_opens--; 966 967 if (zv->zv_total_opens == 0) 968 zvol_last_close(zv); 969 970 mutex_exit(&zfsdev_state_lock); 971 return (error); 972 } 973 974 /* ARGSUSED */ 975 static void 976 zvol_get_done(zgd_t *zgd, int error) 977 { 978 if (zgd->zgd_db) 979 dmu_buf_rele(zgd->zgd_db, zgd); 980 981 rangelock_exit(zgd->zgd_lr); 982 983 kmem_free(zgd, sizeof (zgd_t)); 984 } 985 986 /* 987 * Get data to generate a TX_WRITE intent log record. 988 */ 989 static int 990 zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) 991 { 992 zvol_state_t *zv = arg; 993 uint64_t offset = lr->lr_offset; 994 uint64_t size = lr->lr_length; /* length of user data */ 995 dmu_buf_t *db; 996 zgd_t *zgd; 997 int error; 998 999 ASSERT3P(lwb, !=, NULL); 1000 ASSERT3P(zio, !=, NULL); 1001 ASSERT3U(size, !=, 0); 1002 1003 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1004 zgd->zgd_lwb = lwb; 1005 1006 /* 1007 * Write records come in two flavors: immediate and indirect. 1008 * For small writes it's cheaper to store the data with the 1009 * log record (immediate); for large writes it's cheaper to 1010 * sync the data and get a pointer to it (indirect) so that 1011 * we don't have to write the data twice. 1012 */ 1013 if (buf != NULL) { /* immediate write */ 1014 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 1015 RL_READER); 1016 error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf, 1017 DMU_READ_NO_PREFETCH); 1018 } else { /* indirect write */ 1019 /* 1020 * Have to lock the whole block to ensure when it's written out 1021 * and its checksum is being calculated that no one can change 1022 * the data. Contrarily to zfs_get_data we need not re-check 1023 * blocksize after we get the lock because it cannot be changed. 1024 */ 1025 size = zv->zv_volblocksize; 1026 offset = P2ALIGN(offset, size); 1027 zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 1028 RL_READER); 1029 error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db, 1030 DMU_READ_NO_PREFETCH); 1031 if (error == 0) { 1032 blkptr_t *bp = &lr->lr_blkptr; 1033 1034 zgd->zgd_db = db; 1035 zgd->zgd_bp = bp; 1036 1037 ASSERT(db->db_offset == offset); 1038 ASSERT(db->db_size == size); 1039 1040 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1041 zvol_get_done, zgd); 1042 1043 if (error == 0) 1044 return (0); 1045 } 1046 } 1047 1048 zvol_get_done(zgd, error); 1049 1050 return (error); 1051 } 1052 1053 /* 1054 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 1055 * 1056 * We store data in the log buffers if it's small enough. 1057 * Otherwise we will later flush the data out via dmu_sync(). 1058 */ 1059 ssize_t zvol_immediate_write_sz = 32768; 1060 1061 static void 1062 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1063 boolean_t sync) 1064 { 1065 uint32_t blocksize = zv->zv_volblocksize; 1066 zilog_t *zilog = zv->zv_zilog; 1067 itx_wr_state_t write_state; 1068 1069 if (zil_replaying(zilog, tx)) 1070 return; 1071 1072 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1073 write_state = WR_INDIRECT; 1074 else if (!spa_has_slogs(zilog->zl_spa) && 1075 resid >= blocksize && blocksize > zvol_immediate_write_sz) 1076 write_state = WR_INDIRECT; 1077 else if (sync) 1078 write_state = WR_COPIED; 1079 else 1080 write_state = WR_NEED_COPY; 1081 1082 while (resid) { 1083 itx_t *itx; 1084 lr_write_t *lr; 1085 itx_wr_state_t wr_state = write_state; 1086 ssize_t len = resid; 1087 1088 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) 1089 wr_state = WR_NEED_COPY; 1090 else if (wr_state == WR_INDIRECT) 1091 len = MIN(blocksize - P2PHASE(off, blocksize), resid); 1092 1093 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1094 (wr_state == WR_COPIED ? len : 0)); 1095 lr = (lr_write_t *)&itx->itx_lr; 1096 if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn, 1097 off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1098 zil_itx_destroy(itx); 1099 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1100 lr = (lr_write_t *)&itx->itx_lr; 1101 wr_state = WR_NEED_COPY; 1102 } 1103 1104 itx->itx_wr_state = wr_state; 1105 lr->lr_foid = ZVOL_OBJ; 1106 lr->lr_offset = off; 1107 lr->lr_length = len; 1108 lr->lr_blkoff = 0; 1109 BP_ZERO(&lr->lr_blkptr); 1110 1111 itx->itx_private = zv; 1112 itx->itx_sync = sync; 1113 1114 zil_itx_assign(zilog, itx, tx); 1115 1116 off += len; 1117 resid -= len; 1118 } 1119 } 1120 1121 static int 1122 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset, 1123 uint64_t size, boolean_t doread, boolean_t isdump) 1124 { 1125 vdev_disk_t *dvd; 1126 int c; 1127 int numerrors = 0; 1128 1129 if (vd->vdev_ops == &vdev_mirror_ops || 1130 vd->vdev_ops == &vdev_replacing_ops || 1131 vd->vdev_ops == &vdev_spare_ops) { 1132 for (c = 0; c < vd->vdev_children; c++) { 1133 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1134 addr, offset, origoffset, size, doread, isdump); 1135 if (err != 0) { 1136 numerrors++; 1137 } else if (doread) { 1138 break; 1139 } 1140 } 1141 } 1142 1143 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops) 1144 return (numerrors < vd->vdev_children ? 0 : EIO); 1145 1146 if (doread && !vdev_readable(vd)) 1147 return (SET_ERROR(EIO)); 1148 else if (!doread && !vdev_writeable(vd)) 1149 return (SET_ERROR(EIO)); 1150 1151 if (vd->vdev_ops == &vdev_raidz_ops) { 1152 return (vdev_raidz_physio(vd, 1153 addr, size, offset, origoffset, doread, isdump)); 1154 } 1155 1156 offset += VDEV_LABEL_START_SIZE; 1157 1158 if (ddi_in_panic() || isdump) { 1159 ASSERT(!doread); 1160 if (doread) 1161 return (SET_ERROR(EIO)); 1162 dvd = vd->vdev_tsd; 1163 ASSERT3P(dvd, !=, NULL); 1164 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1165 lbtodb(size))); 1166 } else { 1167 dvd = vd->vdev_tsd; 1168 ASSERT3P(dvd, !=, NULL); 1169 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size, 1170 offset, doread ? B_READ : B_WRITE)); 1171 } 1172 } 1173 1174 static int 1175 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1176 boolean_t doread, boolean_t isdump) 1177 { 1178 vdev_t *vd; 1179 int error; 1180 zvol_extent_t *ze; 1181 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1182 1183 /* Must be sector aligned, and not stradle a block boundary. */ 1184 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1185 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1186 return (SET_ERROR(EINVAL)); 1187 } 1188 ASSERT(size <= zv->zv_volblocksize); 1189 1190 /* Locate the extent this belongs to */ 1191 ze = list_head(&zv->zv_extents); 1192 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1193 offset -= ze->ze_nblks * zv->zv_volblocksize; 1194 ze = list_next(&zv->zv_extents, ze); 1195 } 1196 1197 if (ze == NULL) 1198 return (SET_ERROR(EINVAL)); 1199 1200 if (!ddi_in_panic()) 1201 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1202 1203 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1204 offset += DVA_GET_OFFSET(&ze->ze_dva); 1205 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva), 1206 size, doread, isdump); 1207 1208 if (!ddi_in_panic()) 1209 spa_config_exit(spa, SCL_STATE, FTAG); 1210 1211 return (error); 1212 } 1213 1214 int 1215 zvol_strategy(buf_t *bp) 1216 { 1217 zfs_soft_state_t *zs = NULL; 1218 zvol_state_t *zv; 1219 uint64_t off, volsize; 1220 size_t resid; 1221 char *addr; 1222 objset_t *os; 1223 int error = 0; 1224 boolean_t doread = bp->b_flags & B_READ; 1225 boolean_t is_dumpified; 1226 boolean_t sync; 1227 1228 if (getminor(bp->b_edev) == 0) { 1229 error = SET_ERROR(EINVAL); 1230 } else { 1231 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1232 if (zs == NULL) 1233 error = SET_ERROR(ENXIO); 1234 else if (zs->zss_type != ZSST_ZVOL) 1235 error = SET_ERROR(EINVAL); 1236 } 1237 1238 if (error) { 1239 bioerror(bp, error); 1240 biodone(bp); 1241 return (0); 1242 } 1243 1244 zv = zs->zss_data; 1245 1246 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1247 bioerror(bp, EROFS); 1248 biodone(bp); 1249 return (0); 1250 } 1251 1252 off = ldbtob(bp->b_blkno); 1253 volsize = zv->zv_volsize; 1254 1255 os = zv->zv_objset; 1256 ASSERT(os != NULL); 1257 1258 bp_mapin(bp); 1259 addr = bp->b_un.b_addr; 1260 resid = bp->b_bcount; 1261 1262 if (resid > 0 && (off < 0 || off >= volsize)) { 1263 bioerror(bp, EIO); 1264 biodone(bp); 1265 return (0); 1266 } 1267 1268 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED; 1269 sync = ((!(bp->b_flags & B_ASYNC) && 1270 !(zv->zv_flags & ZVOL_WCE)) || 1271 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1272 !doread && !is_dumpified; 1273 1274 /* 1275 * There must be no buffer changes when doing a dmu_sync() because 1276 * we can't change the data whilst calculating the checksum. 1277 */ 1278 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, off, resid, 1279 doread ? RL_READER : RL_WRITER); 1280 1281 while (resid != 0 && off < volsize) { 1282 size_t size = MIN(resid, zvol_maxphys); 1283 if (is_dumpified) { 1284 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1285 error = zvol_dumpio(zv, addr, off, size, 1286 doread, B_FALSE); 1287 } else if (doread) { 1288 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1289 DMU_READ_PREFETCH); 1290 } else { 1291 dmu_tx_t *tx = dmu_tx_create(os); 1292 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1293 error = dmu_tx_assign(tx, TXG_WAIT); 1294 if (error) { 1295 dmu_tx_abort(tx); 1296 } else { 1297 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1298 zvol_log_write(zv, tx, off, size, sync); 1299 dmu_tx_commit(tx); 1300 } 1301 } 1302 if (error) { 1303 /* convert checksum errors into IO errors */ 1304 if (error == ECKSUM) 1305 error = SET_ERROR(EIO); 1306 break; 1307 } 1308 off += size; 1309 addr += size; 1310 resid -= size; 1311 } 1312 rangelock_exit(lr); 1313 1314 if ((bp->b_resid = resid) == bp->b_bcount) 1315 bioerror(bp, off > volsize ? EINVAL : error); 1316 1317 if (sync) 1318 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1319 biodone(bp); 1320 1321 return (0); 1322 } 1323 1324 /* 1325 * Set the buffer count to the zvol maximum transfer. 1326 * Using our own routine instead of the default minphys() 1327 * means that for larger writes we write bigger buffers on X86 1328 * (128K instead of 56K) and flush the disk write cache less often 1329 * (every zvol_maxphys - currently 1MB) instead of minphys (currently 1330 * 56K on X86 and 128K on sparc). 1331 */ 1332 void 1333 zvol_minphys(struct buf *bp) 1334 { 1335 if (bp->b_bcount > zvol_maxphys) 1336 bp->b_bcount = zvol_maxphys; 1337 } 1338 1339 int 1340 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1341 { 1342 minor_t minor = getminor(dev); 1343 zvol_state_t *zv; 1344 int error = 0; 1345 uint64_t size; 1346 uint64_t boff; 1347 uint64_t resid; 1348 1349 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1350 if (zv == NULL) 1351 return (SET_ERROR(ENXIO)); 1352 1353 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0) 1354 return (SET_ERROR(EINVAL)); 1355 1356 boff = ldbtob(blkno); 1357 resid = ldbtob(nblocks); 1358 1359 VERIFY3U(boff + resid, <=, zv->zv_volsize); 1360 1361 while (resid) { 1362 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 1363 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1364 if (error) 1365 break; 1366 boff += size; 1367 addr += size; 1368 resid -= size; 1369 } 1370 1371 return (error); 1372 } 1373 1374 /*ARGSUSED*/ 1375 int 1376 zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1377 { 1378 minor_t minor = getminor(dev); 1379 zvol_state_t *zv; 1380 uint64_t volsize; 1381 int error = 0; 1382 1383 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1384 if (zv == NULL) 1385 return (SET_ERROR(ENXIO)); 1386 1387 volsize = zv->zv_volsize; 1388 if (uio->uio_resid > 0 && 1389 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1390 return (SET_ERROR(EIO)); 1391 1392 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1393 error = physio(zvol_strategy, NULL, dev, B_READ, 1394 zvol_minphys, uio); 1395 return (error); 1396 } 1397 1398 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 1399 uio->uio_loffset, uio->uio_resid, RL_READER); 1400 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1401 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1402 1403 /* don't read past the end */ 1404 if (bytes > volsize - uio->uio_loffset) 1405 bytes = volsize - uio->uio_loffset; 1406 1407 error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1408 if (error) { 1409 /* convert checksum errors into IO errors */ 1410 if (error == ECKSUM) 1411 error = SET_ERROR(EIO); 1412 break; 1413 } 1414 } 1415 rangelock_exit(lr); 1416 1417 return (error); 1418 } 1419 1420 /*ARGSUSED*/ 1421 int 1422 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1423 { 1424 minor_t minor = getminor(dev); 1425 zvol_state_t *zv; 1426 uint64_t volsize; 1427 int error = 0; 1428 boolean_t sync; 1429 1430 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1431 if (zv == NULL) 1432 return (SET_ERROR(ENXIO)); 1433 1434 volsize = zv->zv_volsize; 1435 if (uio->uio_resid > 0 && 1436 (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1437 return (SET_ERROR(EIO)); 1438 1439 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1440 error = physio(zvol_strategy, NULL, dev, B_WRITE, 1441 zvol_minphys, uio); 1442 return (error); 1443 } 1444 1445 sync = !(zv->zv_flags & ZVOL_WCE) || 1446 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1447 1448 locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 1449 uio->uio_loffset, uio->uio_resid, RL_WRITER); 1450 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1451 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1452 uint64_t off = uio->uio_loffset; 1453 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1454 1455 if (bytes > volsize - off) /* don't write past the end */ 1456 bytes = volsize - off; 1457 1458 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1459 error = dmu_tx_assign(tx, TXG_WAIT); 1460 if (error) { 1461 dmu_tx_abort(tx); 1462 break; 1463 } 1464 error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx); 1465 if (error == 0) 1466 zvol_log_write(zv, tx, off, bytes, sync); 1467 dmu_tx_commit(tx); 1468 1469 if (error) 1470 break; 1471 } 1472 rangelock_exit(lr); 1473 1474 if (sync) 1475 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1476 return (error); 1477 } 1478 1479 int 1480 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1481 { 1482 struct uuid uuid = EFI_RESERVED; 1483 efi_gpe_t gpe = { 0 }; 1484 uint32_t crc; 1485 dk_efi_t efi; 1486 int length; 1487 char *ptr; 1488 1489 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1490 return (SET_ERROR(EFAULT)); 1491 ptr = (char *)(uintptr_t)efi.dki_data_64; 1492 length = efi.dki_length; 1493 /* 1494 * Some clients may attempt to request a PMBR for the 1495 * zvol. Currently this interface will return EINVAL to 1496 * such requests. These requests could be supported by 1497 * adding a check for lba == 0 and consing up an appropriate 1498 * PMBR. 1499 */ 1500 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1501 return (SET_ERROR(EINVAL)); 1502 1503 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1504 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1505 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1506 1507 if (efi.dki_lba == 1) { 1508 efi_gpt_t gpt = { 0 }; 1509 1510 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1511 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1512 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1513 gpt.efi_gpt_MyLBA = LE_64(1ULL); 1514 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1515 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1516 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1517 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1518 gpt.efi_gpt_SizeOfPartitionEntry = 1519 LE_32(sizeof (efi_gpe_t)); 1520 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1521 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1522 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1523 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1524 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1525 flag)) 1526 return (SET_ERROR(EFAULT)); 1527 ptr += sizeof (gpt); 1528 length -= sizeof (gpt); 1529 } 1530 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1531 length), flag)) 1532 return (SET_ERROR(EFAULT)); 1533 return (0); 1534 } 1535 1536 /* 1537 * BEGIN entry points to allow external callers access to the volume. 1538 */ 1539 /* 1540 * Return the volume parameters needed for access from an external caller. 1541 * These values are invariant as long as the volume is held open. 1542 */ 1543 int 1544 zvol_get_volume_params(minor_t minor, uint64_t *blksize, 1545 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 1546 void **rl_hdl, void **dnode_hdl) 1547 { 1548 zvol_state_t *zv; 1549 1550 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1551 if (zv == NULL) 1552 return (SET_ERROR(ENXIO)); 1553 if (zv->zv_flags & ZVOL_DUMPIFIED) 1554 return (SET_ERROR(ENXIO)); 1555 1556 ASSERT(blksize && max_xfer_len && minor_hdl && 1557 objset_hdl && zil_hdl && rl_hdl && dnode_hdl); 1558 1559 *blksize = zv->zv_volblocksize; 1560 *max_xfer_len = (uint64_t)zvol_maxphys; 1561 *minor_hdl = zv; 1562 *objset_hdl = zv->zv_objset; 1563 *zil_hdl = zv->zv_zilog; 1564 *rl_hdl = &zv->zv_rangelock; 1565 *dnode_hdl = zv->zv_dn; 1566 return (0); 1567 } 1568 1569 /* 1570 * Return the current volume size to an external caller. 1571 * The size can change while the volume is open. 1572 */ 1573 uint64_t 1574 zvol_get_volume_size(void *minor_hdl) 1575 { 1576 zvol_state_t *zv = minor_hdl; 1577 1578 return (zv->zv_volsize); 1579 } 1580 1581 /* 1582 * Return the current WCE setting to an external caller. 1583 * The WCE setting can change while the volume is open. 1584 */ 1585 int 1586 zvol_get_volume_wce(void *minor_hdl) 1587 { 1588 zvol_state_t *zv = minor_hdl; 1589 1590 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 1591 } 1592 1593 /* 1594 * Entry point for external callers to zvol_log_write 1595 */ 1596 void 1597 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 1598 boolean_t sync) 1599 { 1600 zvol_state_t *zv = minor_hdl; 1601 1602 zvol_log_write(zv, tx, off, resid, sync); 1603 } 1604 /* 1605 * END entry points to allow external callers access to the volume. 1606 */ 1607 1608 /* 1609 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 1610 */ 1611 static void 1612 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 1613 boolean_t sync) 1614 { 1615 itx_t *itx; 1616 lr_truncate_t *lr; 1617 zilog_t *zilog = zv->zv_zilog; 1618 1619 if (zil_replaying(zilog, tx)) 1620 return; 1621 1622 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 1623 lr = (lr_truncate_t *)&itx->itx_lr; 1624 lr->lr_foid = ZVOL_OBJ; 1625 lr->lr_offset = off; 1626 lr->lr_length = len; 1627 1628 itx->itx_sync = sync; 1629 zil_itx_assign(zilog, itx, tx); 1630 } 1631 1632 /* 1633 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1634 * Also a dirtbag dkio ioctl for unmap/free-block functionality. 1635 */ 1636 /*ARGSUSED*/ 1637 int 1638 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1639 { 1640 zvol_state_t *zv; 1641 struct dk_callback *dkc; 1642 int error = 0; 1643 locked_range_t *lr; 1644 1645 mutex_enter(&zfsdev_state_lock); 1646 1647 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1648 1649 if (zv == NULL) { 1650 mutex_exit(&zfsdev_state_lock); 1651 return (SET_ERROR(ENXIO)); 1652 } 1653 ASSERT(zv->zv_total_opens > 0); 1654 1655 switch (cmd) { 1656 1657 case DKIOCINFO: 1658 { 1659 struct dk_cinfo dki; 1660 1661 bzero(&dki, sizeof (dki)); 1662 (void) strcpy(dki.dki_cname, "zvol"); 1663 (void) strcpy(dki.dki_dname, "zvol"); 1664 dki.dki_ctype = DKC_UNKNOWN; 1665 dki.dki_unit = getminor(dev); 1666 dki.dki_maxtransfer = 1667 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs); 1668 mutex_exit(&zfsdev_state_lock); 1669 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1670 error = SET_ERROR(EFAULT); 1671 return (error); 1672 } 1673 1674 case DKIOCGMEDIAINFO: 1675 { 1676 struct dk_minfo dkm; 1677 1678 bzero(&dkm, sizeof (dkm)); 1679 dkm.dki_lbsize = 1U << zv->zv_min_bs; 1680 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1681 dkm.dki_media_type = DK_UNKNOWN; 1682 mutex_exit(&zfsdev_state_lock); 1683 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1684 error = SET_ERROR(EFAULT); 1685 return (error); 1686 } 1687 1688 case DKIOCGMEDIAINFOEXT: 1689 { 1690 struct dk_minfo_ext dkmext; 1691 1692 bzero(&dkmext, sizeof (dkmext)); 1693 dkmext.dki_lbsize = 1U << zv->zv_min_bs; 1694 dkmext.dki_pbsize = zv->zv_volblocksize; 1695 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1696 dkmext.dki_media_type = DK_UNKNOWN; 1697 mutex_exit(&zfsdev_state_lock); 1698 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag)) 1699 error = SET_ERROR(EFAULT); 1700 return (error); 1701 } 1702 1703 case DKIOCGETEFI: 1704 { 1705 uint64_t vs = zv->zv_volsize; 1706 uint8_t bs = zv->zv_min_bs; 1707 1708 mutex_exit(&zfsdev_state_lock); 1709 error = zvol_getefi((void *)arg, flag, vs, bs); 1710 return (error); 1711 } 1712 1713 case DKIOCFLUSHWRITECACHE: 1714 dkc = (struct dk_callback *)arg; 1715 mutex_exit(&zfsdev_state_lock); 1716 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1717 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1718 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1719 error = 0; 1720 } 1721 return (error); 1722 1723 case DKIOCGETWCE: 1724 { 1725 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1726 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1727 flag)) 1728 error = SET_ERROR(EFAULT); 1729 break; 1730 } 1731 case DKIOCSETWCE: 1732 { 1733 int wce; 1734 if (ddi_copyin((void *)arg, &wce, sizeof (int), 1735 flag)) { 1736 error = SET_ERROR(EFAULT); 1737 break; 1738 } 1739 if (wce) { 1740 zv->zv_flags |= ZVOL_WCE; 1741 mutex_exit(&zfsdev_state_lock); 1742 } else { 1743 zv->zv_flags &= ~ZVOL_WCE; 1744 mutex_exit(&zfsdev_state_lock); 1745 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1746 } 1747 return (0); 1748 } 1749 1750 case DKIOCGGEOM: 1751 case DKIOCGVTOC: 1752 /* 1753 * commands using these (like prtvtoc) expect ENOTSUP 1754 * since we're emulating an EFI label 1755 */ 1756 error = SET_ERROR(ENOTSUP); 1757 break; 1758 1759 case DKIOCDUMPINIT: 1760 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1761 RL_WRITER); 1762 error = zvol_dumpify(zv); 1763 rangelock_exit(lr); 1764 break; 1765 1766 case DKIOCDUMPFINI: 1767 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 1768 break; 1769 lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1770 RL_WRITER); 1771 error = zvol_dump_fini(zv); 1772 rangelock_exit(lr); 1773 break; 1774 1775 case DKIOCFREE: 1776 { 1777 dkioc_free_list_t *dfl; 1778 dmu_tx_t *tx; 1779 1780 if (!zvol_unmap_enabled) 1781 break; 1782 1783 if (!(flag & FKIOCTL)) { 1784 error = dfl_copyin((void *)arg, &dfl, flag, KM_SLEEP); 1785 if (error != 0) 1786 break; 1787 } else { 1788 dfl = (dkioc_free_list_t *)arg; 1789 ASSERT3U(dfl->dfl_num_exts, <=, DFL_COPYIN_MAX_EXTS); 1790 if (dfl->dfl_num_exts > DFL_COPYIN_MAX_EXTS) { 1791 error = SET_ERROR(EINVAL); 1792 break; 1793 } 1794 } 1795 1796 mutex_exit(&zfsdev_state_lock); 1797 1798 for (int i = 0; i < dfl->dfl_num_exts; i++) { 1799 uint64_t start = dfl->dfl_exts[i].dfle_start, 1800 length = dfl->dfl_exts[i].dfle_length, 1801 end = start + length; 1802 1803 /* 1804 * Apply Postel's Law to length-checking. If they 1805 * overshoot, just blank out until the end, if there's 1806 * a need to blank out anything. 1807 */ 1808 if (start >= zv->zv_volsize) 1809 continue; /* No need to do anything... */ 1810 if (end > zv->zv_volsize) { 1811 end = DMU_OBJECT_END; 1812 length = end - start; 1813 } 1814 1815 lr = rangelock_enter(&zv->zv_rangelock, start, length, 1816 RL_WRITER); 1817 tx = dmu_tx_create(zv->zv_objset); 1818 error = dmu_tx_assign(tx, TXG_WAIT); 1819 if (error != 0) { 1820 dmu_tx_abort(tx); 1821 } else { 1822 zvol_log_truncate(zv, tx, start, length, 1823 B_TRUE); 1824 dmu_tx_commit(tx); 1825 error = dmu_free_long_range(zv->zv_objset, 1826 ZVOL_OBJ, start, length); 1827 } 1828 1829 rangelock_exit(lr); 1830 1831 if (error != 0) 1832 break; 1833 } 1834 1835 /* 1836 * If the write-cache is disabled, 'sync' property 1837 * is set to 'always', or if the caller is asking for 1838 * a synchronous free, commit this operation to the zil. 1839 * This will sync any previous uncommitted writes to the 1840 * zvol object. 1841 * Can be overridden by the zvol_unmap_sync_enabled tunable. 1842 */ 1843 if ((error == 0) && zvol_unmap_sync_enabled && 1844 (!(zv->zv_flags & ZVOL_WCE) || 1845 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) || 1846 (dfl->dfl_flags & DF_WAIT_SYNC))) { 1847 zil_commit(zv->zv_zilog, ZVOL_OBJ); 1848 } 1849 1850 if (!(flag & FKIOCTL)) 1851 dfl_free(dfl); 1852 1853 return (error); 1854 } 1855 1856 default: 1857 error = SET_ERROR(ENOTTY); 1858 break; 1859 1860 } 1861 mutex_exit(&zfsdev_state_lock); 1862 return (error); 1863 } 1864 1865 int 1866 zvol_busy(void) 1867 { 1868 return (zvol_minors != 0); 1869 } 1870 1871 void 1872 zvol_init(void) 1873 { 1874 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1875 1) == 0); 1876 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1877 } 1878 1879 void 1880 zvol_fini(void) 1881 { 1882 mutex_destroy(&zfsdev_state_lock); 1883 ddi_soft_state_fini(&zfsdev_state); 1884 } 1885 1886 /*ARGSUSED*/ 1887 static int 1888 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx) 1889 { 1890 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1891 1892 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1893 return (1); 1894 return (0); 1895 } 1896 1897 /*ARGSUSED*/ 1898 static void 1899 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx) 1900 { 1901 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1902 1903 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx); 1904 } 1905 1906 static int 1907 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1908 { 1909 dmu_tx_t *tx; 1910 int error; 1911 objset_t *os = zv->zv_objset; 1912 spa_t *spa = dmu_objset_spa(os); 1913 vdev_t *vd = spa->spa_root_vdev; 1914 nvlist_t *nv = NULL; 1915 uint64_t version = spa_version(spa); 1916 uint64_t checksum, compress, refresrv, vbs, dedup; 1917 1918 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1919 ASSERT(vd->vdev_ops == &vdev_root_ops); 1920 1921 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1922 DMU_OBJECT_END); 1923 if (error != 0) 1924 return (error); 1925 /* wait for dmu_free_long_range to actually free the blocks */ 1926 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1927 1928 /* 1929 * If the pool on which the dump device is being initialized has more 1930 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is 1931 * enabled. If so, bump that feature's counter to indicate that the 1932 * feature is active. We also check the vdev type to handle the 1933 * following case: 1934 * # zpool create test raidz disk1 disk2 disk3 1935 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev), 1936 * the raidz vdev itself has 3 children. 1937 */ 1938 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) { 1939 if (!spa_feature_is_enabled(spa, 1940 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1941 return (SET_ERROR(ENOTSUP)); 1942 (void) dsl_sync_task(spa_name(spa), 1943 zfs_mvdev_dump_feature_check, 1944 zfs_mvdev_dump_activate_feature_sync, NULL, 1945 2, ZFS_SPACE_CHECK_RESERVED); 1946 } 1947 1948 if (!resize) { 1949 error = dsl_prop_get_integer(zv->zv_name, 1950 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1951 if (error == 0) { 1952 error = dsl_prop_get_integer(zv->zv_name, 1953 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, 1954 NULL); 1955 } 1956 if (error == 0) { 1957 error = dsl_prop_get_integer(zv->zv_name, 1958 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 1959 &refresrv, NULL); 1960 } 1961 if (error == 0) { 1962 error = dsl_prop_get_integer(zv->zv_name, 1963 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, 1964 NULL); 1965 } 1966 if (version >= SPA_VERSION_DEDUP && error == 0) { 1967 error = dsl_prop_get_integer(zv->zv_name, 1968 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 1969 } 1970 } 1971 if (error != 0) 1972 return (error); 1973 1974 tx = dmu_tx_create(os); 1975 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1976 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1977 error = dmu_tx_assign(tx, TXG_WAIT); 1978 if (error != 0) { 1979 dmu_tx_abort(tx); 1980 return (error); 1981 } 1982 1983 /* 1984 * If we are resizing the dump device then we only need to 1985 * update the refreservation to match the newly updated 1986 * zvolsize. Otherwise, we save off the original state of the 1987 * zvol so that we can restore them if the zvol is ever undumpified. 1988 */ 1989 if (resize) { 1990 error = zap_update(os, ZVOL_ZAP_OBJ, 1991 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1992 &zv->zv_volsize, tx); 1993 } else { 1994 error = zap_update(os, ZVOL_ZAP_OBJ, 1995 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1996 &compress, tx); 1997 if (error == 0) { 1998 error = zap_update(os, ZVOL_ZAP_OBJ, 1999 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, 2000 &checksum, tx); 2001 } 2002 if (error == 0) { 2003 error = zap_update(os, ZVOL_ZAP_OBJ, 2004 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2005 &refresrv, tx); 2006 } 2007 if (error == 0) { 2008 error = zap_update(os, ZVOL_ZAP_OBJ, 2009 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 2010 &vbs, tx); 2011 } 2012 if (error == 0) { 2013 error = dmu_object_set_blocksize( 2014 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx); 2015 } 2016 if (version >= SPA_VERSION_DEDUP && error == 0) { 2017 error = zap_update(os, ZVOL_ZAP_OBJ, 2018 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 2019 &dedup, tx); 2020 } 2021 if (error == 0) 2022 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE; 2023 } 2024 dmu_tx_commit(tx); 2025 2026 /* 2027 * We only need update the zvol's property if we are initializing 2028 * the dump area for the first time. 2029 */ 2030 if (error == 0 && !resize) { 2031 /* 2032 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum 2033 * function. Otherwise, use the old default -- OFF. 2034 */ 2035 checksum = spa_feature_is_active(spa, 2036 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY : 2037 ZIO_CHECKSUM_OFF; 2038 2039 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2040 VERIFY(nvlist_add_uint64(nv, 2041 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 2042 VERIFY(nvlist_add_uint64(nv, 2043 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 2044 ZIO_COMPRESS_OFF) == 0); 2045 VERIFY(nvlist_add_uint64(nv, 2046 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 2047 checksum) == 0); 2048 if (version >= SPA_VERSION_DEDUP) { 2049 VERIFY(nvlist_add_uint64(nv, 2050 zfs_prop_to_name(ZFS_PROP_DEDUP), 2051 ZIO_CHECKSUM_OFF) == 0); 2052 } 2053 2054 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2055 nv, NULL); 2056 nvlist_free(nv); 2057 } 2058 2059 /* Allocate the space for the dump */ 2060 if (error == 0) 2061 error = zvol_prealloc(zv); 2062 return (error); 2063 } 2064 2065 static int 2066 zvol_dumpify(zvol_state_t *zv) 2067 { 2068 int error = 0; 2069 uint64_t dumpsize = 0; 2070 dmu_tx_t *tx; 2071 objset_t *os = zv->zv_objset; 2072 2073 if (zv->zv_flags & ZVOL_RDONLY) 2074 return (SET_ERROR(EROFS)); 2075 2076 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 2077 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 2078 boolean_t resize = (dumpsize > 0); 2079 2080 if ((error = zvol_dump_init(zv, resize)) != 0) { 2081 (void) zvol_dump_fini(zv); 2082 return (error); 2083 } 2084 } 2085 2086 /* 2087 * Build up our lba mapping. 2088 */ 2089 error = zvol_get_lbas(zv); 2090 if (error) { 2091 (void) zvol_dump_fini(zv); 2092 return (error); 2093 } 2094 2095 tx = dmu_tx_create(os); 2096 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2097 error = dmu_tx_assign(tx, TXG_WAIT); 2098 if (error) { 2099 dmu_tx_abort(tx); 2100 (void) zvol_dump_fini(zv); 2101 return (error); 2102 } 2103 2104 zv->zv_flags |= ZVOL_DUMPIFIED; 2105 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 2106 &zv->zv_volsize, tx); 2107 dmu_tx_commit(tx); 2108 2109 if (error) { 2110 (void) zvol_dump_fini(zv); 2111 return (error); 2112 } 2113 2114 txg_wait_synced(dmu_objset_pool(os), 0); 2115 return (0); 2116 } 2117 2118 static int 2119 zvol_dump_fini(zvol_state_t *zv) 2120 { 2121 dmu_tx_t *tx; 2122 objset_t *os = zv->zv_objset; 2123 nvlist_t *nv; 2124 int error = 0; 2125 uint64_t checksum, compress, refresrv, vbs, dedup; 2126 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 2127 2128 /* 2129 * Attempt to restore the zvol back to its pre-dumpified state. 2130 * This is a best-effort attempt as it's possible that not all 2131 * of these properties were initialized during the dumpify process 2132 * (i.e. error during zvol_dump_init). 2133 */ 2134 2135 tx = dmu_tx_create(os); 2136 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2137 error = dmu_tx_assign(tx, TXG_WAIT); 2138 if (error) { 2139 dmu_tx_abort(tx); 2140 return (error); 2141 } 2142 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 2143 dmu_tx_commit(tx); 2144 2145 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2146 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 2147 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2148 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 2149 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2150 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 2151 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2152 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 2153 2154 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2155 (void) nvlist_add_uint64(nv, 2156 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 2157 (void) nvlist_add_uint64(nv, 2158 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 2159 (void) nvlist_add_uint64(nv, 2160 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 2161 if (version >= SPA_VERSION_DEDUP && 2162 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2163 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 2164 (void) nvlist_add_uint64(nv, 2165 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 2166 } 2167 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2168 nv, NULL); 2169 nvlist_free(nv); 2170 2171 zvol_free_extents(zv); 2172 zv->zv_flags &= ~ZVOL_DUMPIFIED; 2173 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2174 /* wait for dmu_free_long_range to actually free the blocks */ 2175 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2176 tx = dmu_tx_create(os); 2177 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2178 error = dmu_tx_assign(tx, TXG_WAIT); 2179 if (error) { 2180 dmu_tx_abort(tx); 2181 return (error); 2182 } 2183 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2184 zv->zv_volblocksize = vbs; 2185 dmu_tx_commit(tx); 2186 2187 return (0); 2188 } 2189