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 * Copyright (c) 2006-2010 Pawel Jakub Dawidek <pjd@FreeBSD.org> 25 * All rights reserved. 26 * 27 * Portions Copyright 2010 Robert Milkowski 28 * 29 * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 30 * Copyright (c) 2012, 2016 by Delphix. All rights reserved. 31 * Copyright (c) 2013, Joyent, Inc. All rights reserved. 32 * Copyright (c) 2014 Integros [integros.com] 33 */ 34 35 /* Portions Copyright 2011 Martin Matuska <mm@FreeBSD.org> */ 36 37 /* 38 * ZFS volume emulation driver. 39 * 40 * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 41 * Volumes are accessed through the symbolic links named: 42 * 43 * /dev/zvol/dsk/<pool_name>/<dataset_name> 44 * /dev/zvol/rdsk/<pool_name>/<dataset_name> 45 * 46 * These links are created by the /dev filesystem (sdev_zvolops.c). 47 * Volumes are persistent through reboot. No user command needs to be 48 * run before opening and using a device. 49 * 50 * FreeBSD notes. 51 * On FreeBSD ZVOLs are simply GEOM providers like any other storage device 52 * in the system. 53 */ 54 55 #include <sys/types.h> 56 #include <sys/param.h> 57 #include <sys/kernel.h> 58 #include <sys/errno.h> 59 #include <sys/uio.h> 60 #include <sys/buf.h> 61 #include <sys/open.h> 62 #include <sys/kmem.h> 63 #include <sys/conf.h> 64 #include <sys/cmn_err.h> 65 #include <sys/stat.h> 66 #include <sys/zap.h> 67 #include <sys/spa.h> 68 #include <sys/spa_impl.h> 69 #include <sys/zio.h> 70 #include <sys/disk.h> 71 #include <sys/dmu_traverse.h> 72 #include <sys/dnode.h> 73 #include <sys/dsl_dataset.h> 74 #include <sys/dsl_prop.h> 75 #include <sys/dkio.h> 76 #include <sys/byteorder.h> 77 #include <sys/sunddi.h> 78 #include <sys/dirent.h> 79 #include <sys/policy.h> 80 #include <sys/queue.h> 81 #include <sys/fs/zfs.h> 82 #include <sys/zfs_ioctl.h> 83 #include <sys/zil.h> 84 #include <sys/refcount.h> 85 #include <sys/zfs_znode.h> 86 #include <sys/zfs_rlock.h> 87 #include <sys/vdev_impl.h> 88 #include <sys/vdev_raidz.h> 89 #include <sys/zvol.h> 90 #include <sys/zil_impl.h> 91 #include <sys/dbuf.h> 92 #include <sys/dmu_tx.h> 93 #include <sys/zfeature.h> 94 #include <sys/zio_checksum.h> 95 #include <sys/filio.h> 96 97 #include "zfs_namecheck.h" 98 99 #ifdef __FreeBSD__ 100 #include <sys/bio.h> 101 #include <geom/geom.h> 102 103 struct g_class zfs_zvol_class = { 104 .name = "ZFS::ZVOL", 105 .version = G_VERSION, 106 }; 107 108 DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol); 109 #endif 110 111 #ifdef __NetBSD__ 112 #include <sys/pathname.h> 113 #include <prop/proplib.h> 114 115 #define DROP_GIANT() /* nothing */ 116 #define PICKUP_GIANT() /* nothing */ 117 118 void zvol_minphys(struct buf *); 119 static struct dkdriver zvol_dkdriver = { zvol_strategy, zvol_minphys }; 120 121 #define bioerror(bp, er) ((bp)->b_error = (er)) 122 #define b_edev b_dev 123 #endif 124 125 void *zfsdev_state; 126 static char *zvol_tag = "zvol_tag"; 127 128 #define ZVOL_DUMPSIZE "dumpsize" 129 130 #ifdef __FreeBSD__ 131 /* 132 * In FreeBSD we've replaced the upstream zfsdev_state_lock with the 133 * spa_namespace_lock in the ZVOL code. 134 */ 135 #define zfsdev_state_lock spa_namespace_lock 136 #else 137 /* 138 * This lock protects the zfsdev_state structure from being modified 139 * while it's being used, e.g. an open that comes in before a create 140 * finishes. It also protects temporary opens of the dataset so that, 141 * e.g., an open doesn't get a spurious EBUSY. 142 */ 143 kmutex_t zfsdev_state_lock; 144 #endif 145 static uint32_t zvol_minors; 146 147 #ifndef illumos 148 SYSCTL_DECL(_vfs_zfs); 149 SYSCTL_NODE(_vfs_zfs, OID_AUTO, vol, CTLFLAG_RW, 0, "ZFS VOLUME"); 150 static int volmode = ZFS_VOLMODE_GEOM; 151 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, mode, CTLFLAG_RWTUN, &volmode, 0, 152 "Expose as GEOM providers (1), device files (2) or neither"); 153 static boolean_t zpool_on_zvol = B_FALSE; 154 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, recursive, CTLFLAG_RWTUN, &zpool_on_zvol, 0, 155 "Allow zpools to use zvols as vdevs (DANGEROUS)"); 156 157 #endif 158 typedef struct zvol_extent { 159 list_node_t ze_node; 160 dva_t ze_dva; /* dva associated with this extent */ 161 uint64_t ze_nblks; /* number of blocks in extent */ 162 } zvol_extent_t; 163 164 /* 165 * The in-core state of each volume. 166 */ 167 typedef struct zvol_state { 168 #ifndef illumos 169 LIST_ENTRY(zvol_state) zv_links; 170 #endif 171 char zv_name[MAXPATHLEN]; /* pool/dd name */ 172 uint64_t zv_volsize; /* amount of space we advertise */ 173 uint64_t zv_volblocksize; /* volume block size */ 174 #ifdef __FreeBSD__ 175 struct cdev *zv_dev; /* non-GEOM device */ 176 struct g_provider *zv_provider; /* GEOM provider */ 177 #else 178 minor_t zv_minor; /* minor number */ 179 #endif 180 uint8_t zv_min_bs; /* minimum addressable block shift */ 181 uint8_t zv_flags; /* readonly, dumpified, etc. */ 182 objset_t *zv_objset; /* objset handle */ 183 #if defined(illumos) || defined(__NetBSD__) 184 uint32_t zv_open_count[OTYPCNT]; /* open counts */ 185 #endif 186 uint32_t zv_total_opens; /* total open count */ 187 uint32_t zv_sync_cnt; /* synchronous open count */ 188 zilog_t *zv_zilog; /* ZIL handle */ 189 list_t zv_extents; /* List of extents for dump */ 190 znode_t zv_znode; /* for range locking */ 191 dmu_buf_t *zv_dbuf; /* bonus handle */ 192 #ifdef __FreeBSD__ 193 int zv_state; 194 int zv_volmode; /* Provide GEOM or cdev */ 195 struct bio_queue_head zv_queue; 196 struct mtx zv_queue_mtx; /* zv_queue mutex */ 197 #endif 198 #ifdef __NetBSD__ 199 struct disk zv_dk; /* disk statistics */ 200 kmutex_t zv_dklock; /* disk statistics */ 201 #endif 202 } zvol_state_t; 203 204 #ifndef illumos 205 static LIST_HEAD(, zvol_state) all_zvols; 206 #endif 207 /* 208 * zvol specific flags 209 */ 210 #define ZVOL_RDONLY 0x1 211 #define ZVOL_DUMPIFIED 0x2 212 #define ZVOL_EXCL 0x4 213 #define ZVOL_WCE 0x8 214 215 /* 216 * zvol maximum transfer in one DMU tx. 217 */ 218 int zvol_maxphys = DMU_MAX_ACCESS/2; 219 220 /* 221 * Toggle unmap functionality. 222 */ 223 boolean_t zvol_unmap_enabled = B_TRUE; 224 225 /* 226 * If true, unmaps requested as synchronous are executed synchronously, 227 * otherwise all unmaps are asynchronous. 228 */ 229 boolean_t zvol_unmap_sync_enabled = B_FALSE; 230 231 #ifdef __FreeBSD__ 232 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_enabled, CTLFLAG_RWTUN, 233 &zvol_unmap_enabled, 0, 234 "Enable UNMAP functionality"); 235 236 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_sync_enabled, CTLFLAG_RWTUN, 237 &zvol_unmap_sync_enabled, 0, 238 "UNMAPs requested as sync are executed synchronously"); 239 240 static d_open_t zvol_d_open; 241 static d_close_t zvol_d_close; 242 static d_read_t zvol_read; 243 static d_write_t zvol_write; 244 static d_ioctl_t zvol_d_ioctl; 245 static d_strategy_t zvol_strategy; 246 247 static struct cdevsw zvol_cdevsw = { 248 .d_version = D_VERSION, 249 .d_open = zvol_d_open, 250 .d_close = zvol_d_close, 251 .d_read = zvol_read, 252 .d_write = zvol_write, 253 .d_ioctl = zvol_d_ioctl, 254 .d_strategy = zvol_strategy, 255 .d_name = "zvol", 256 .d_flags = D_DISK | D_TRACKCLOSE, 257 }; 258 259 static void zvol_geom_run(zvol_state_t *zv); 260 static void zvol_geom_destroy(zvol_state_t *zv); 261 static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace); 262 static void zvol_geom_start(struct bio *bp); 263 static void zvol_geom_worker(void *arg); 264 static void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, 265 uint64_t len, boolean_t sync); 266 #endif /* __FreeBSD__ */ 267 #ifdef __NetBSD__ 268 /* XXXNETBSD need devsw, etc */ 269 #endif 270 271 extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 272 nvlist_t *, nvlist_t *); 273 static int zvol_remove_zv(zvol_state_t *); 274 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 275 static int zvol_dumpify(zvol_state_t *zv); 276 static int zvol_dump_fini(zvol_state_t *zv); 277 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 278 279 static void 280 zvol_size_changed(zvol_state_t *zv, uint64_t volsize) 281 { 282 #ifdef illumos 283 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor); 284 285 zv->zv_volsize = volsize; 286 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 287 "Size", volsize) == DDI_SUCCESS); 288 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 289 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 290 291 /* Notify specfs to invalidate the cached size */ 292 spec_size_invalidate(dev, VBLK); 293 spec_size_invalidate(dev, VCHR); 294 #endif /* illumos */ 295 #ifdef __FreeBSD__ 296 zv->zv_volsize = volsize; 297 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 298 struct g_provider *pp; 299 300 pp = zv->zv_provider; 301 if (pp == NULL) 302 return; 303 g_topology_lock(); 304 305 /* 306 * Do not invoke resize event when initial size was zero. 307 * ZVOL initializes the size on first open, this is not 308 * real resizing. 309 */ 310 if (pp->mediasize == 0) 311 pp->mediasize = zv->zv_volsize; 312 else 313 g_resize_provider(pp, zv->zv_volsize); 314 g_topology_unlock(); 315 } 316 #endif /* __FreeBSD__ */ 317 #ifdef __NetBSD__ 318 prop_dictionary_t disk_info, odisk_info, geom; 319 struct disk *disk; 320 321 disk = &zv->zv_dk; 322 323 disk_info = prop_dictionary_create(); 324 geom = prop_dictionary_create(); 325 326 prop_dictionary_set_cstring_nocopy(disk_info, "type", "ESDI"); 327 prop_dictionary_set_uint64(geom, "sectors-per-unit", zv->zv_volsize); 328 prop_dictionary_set_uint32(geom, "sector-size", 329 DEV_BSIZE /* XXX 512? */); 330 prop_dictionary_set_uint32(geom, "sectors-per-track", 32); 331 prop_dictionary_set_uint32(geom, "tracks-per-cylinder", 64); 332 prop_dictionary_set_uint32(geom, "cylinders-per-unit", zv->zv_volsize / 2048); 333 prop_dictionary_set(disk_info, "geometry", geom); 334 prop_object_release(geom); 335 336 odisk_info = disk->dk_info; 337 disk->dk_info = disk_info; 338 339 if (odisk_info != NULL) 340 prop_object_release(odisk_info); 341 #endif 342 } 343 344 345 int 346 zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 347 { 348 if (volsize == 0) 349 return (SET_ERROR(EINVAL)); 350 351 if (volsize % blocksize != 0) 352 return (SET_ERROR(EINVAL)); 353 354 #ifdef _ILP32 355 if (volsize - 1 > SPEC_MAXOFFSET_T) 356 return (SET_ERROR(EOVERFLOW)); 357 #endif 358 return (0); 359 } 360 361 int 362 zvol_check_volblocksize(uint64_t volblocksize) 363 { 364 if (volblocksize < SPA_MINBLOCKSIZE || 365 volblocksize > SPA_OLD_MAXBLOCKSIZE || 366 !ISP2(volblocksize)) 367 return (SET_ERROR(EDOM)); 368 369 return (0); 370 } 371 372 int 373 zvol_get_stats(objset_t *os, nvlist_t *nv) 374 { 375 int error; 376 dmu_object_info_t doi; 377 uint64_t val; 378 379 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 380 if (error) 381 return (error); 382 383 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 384 385 error = dmu_object_info(os, ZVOL_OBJ, &doi); 386 387 if (error == 0) { 388 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 389 doi.doi_data_block_size); 390 } 391 392 return (error); 393 } 394 395 static zvol_state_t * 396 zvol_minor_lookup(const char *name) 397 { 398 #ifdef illumos 399 minor_t minor; 400 #endif 401 zvol_state_t *zv; 402 403 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 404 405 #ifdef illumos 406 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) 407 #else 408 LIST_FOREACH(zv, &all_zvols, zv_links) 409 #endif 410 { 411 #ifdef illumos 412 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 413 if (zv == NULL) 414 continue; 415 #endif 416 417 if (strcmp(zv->zv_name, name) == 0) 418 return (zv); 419 } 420 421 return (NULL); 422 } 423 424 /* extent mapping arg */ 425 struct maparg { 426 zvol_state_t *ma_zv; 427 uint64_t ma_blks; 428 }; 429 430 /*ARGSUSED*/ 431 static int 432 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 433 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 434 { 435 struct maparg *ma = arg; 436 zvol_extent_t *ze; 437 int bs = ma->ma_zv->zv_volblocksize; 438 439 if (bp == NULL || BP_IS_HOLE(bp) || 440 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 441 return (0); 442 443 VERIFY(!BP_IS_EMBEDDED(bp)); 444 445 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 446 ma->ma_blks++; 447 448 /* Abort immediately if we have encountered gang blocks */ 449 if (BP_IS_GANG(bp)) 450 return (SET_ERROR(EFRAGS)); 451 452 /* 453 * See if the block is at the end of the previous extent. 454 */ 455 ze = list_tail(&ma->ma_zv->zv_extents); 456 if (ze && 457 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 458 DVA_GET_OFFSET(BP_IDENTITY(bp)) == 459 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 460 ze->ze_nblks++; 461 return (0); 462 } 463 464 dprintf_bp(bp, "%s", "next blkptr:"); 465 466 /* start a new extent */ 467 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 468 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 469 ze->ze_nblks = 1; 470 list_insert_tail(&ma->ma_zv->zv_extents, ze); 471 return (0); 472 } 473 474 static void 475 zvol_free_extents(zvol_state_t *zv) 476 { 477 zvol_extent_t *ze; 478 479 while (ze = list_head(&zv->zv_extents)) { 480 list_remove(&zv->zv_extents, ze); 481 kmem_free(ze, sizeof (zvol_extent_t)); 482 } 483 } 484 485 static int 486 zvol_get_lbas(zvol_state_t *zv) 487 { 488 objset_t *os = zv->zv_objset; 489 struct maparg ma; 490 int err; 491 492 ma.ma_zv = zv; 493 ma.ma_blks = 0; 494 zvol_free_extents(zv); 495 496 /* commit any in-flight changes before traversing the dataset */ 497 txg_wait_synced(dmu_objset_pool(os), 0); 498 err = traverse_dataset(dmu_objset_ds(os), 0, 499 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 500 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 501 zvol_free_extents(zv); 502 return (err ? err : EIO); 503 } 504 505 return (0); 506 } 507 508 /* ARGSUSED */ 509 void 510 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 511 { 512 zfs_creat_t *zct = arg; 513 nvlist_t *nvprops = zct->zct_props; 514 int error; 515 uint64_t volblocksize, volsize; 516 517 VERIFY(nvlist_lookup_uint64(nvprops, 518 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 519 if (nvlist_lookup_uint64(nvprops, 520 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 521 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 522 523 /* 524 * These properties must be removed from the list so the generic 525 * property setting step won't apply to them. 526 */ 527 VERIFY(nvlist_remove_all(nvprops, 528 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 529 (void) nvlist_remove_all(nvprops, 530 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 531 532 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 533 DMU_OT_NONE, 0, tx); 534 ASSERT(error == 0); 535 536 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 537 DMU_OT_NONE, 0, tx); 538 ASSERT(error == 0); 539 540 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 541 ASSERT(error == 0); 542 } 543 544 /* 545 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 546 * implement DKIOCFREE/free-long-range. 547 */ 548 static int 549 zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap) 550 { 551 uint64_t offset, length; 552 553 if (byteswap) 554 byteswap_uint64_array(lr, sizeof (*lr)); 555 556 offset = lr->lr_offset; 557 length = lr->lr_length; 558 559 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 560 } 561 562 /* 563 * Replay a TX_WRITE ZIL transaction that didn't get committed 564 * after a system failure 565 */ 566 static int 567 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 568 { 569 objset_t *os = zv->zv_objset; 570 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 571 uint64_t offset, length; 572 dmu_tx_t *tx; 573 int error; 574 575 if (byteswap) 576 byteswap_uint64_array(lr, sizeof (*lr)); 577 578 offset = lr->lr_offset; 579 length = lr->lr_length; 580 581 /* If it's a dmu_sync() block, write the whole block */ 582 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 583 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 584 if (length < blocksize) { 585 offset -= offset % blocksize; 586 length = blocksize; 587 } 588 } 589 590 tx = dmu_tx_create(os); 591 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 592 error = dmu_tx_assign(tx, TXG_WAIT); 593 if (error) { 594 dmu_tx_abort(tx); 595 } else { 596 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 597 dmu_tx_commit(tx); 598 } 599 600 return (error); 601 } 602 603 /* ARGSUSED */ 604 static int 605 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 606 { 607 return (SET_ERROR(ENOTSUP)); 608 } 609 610 /* 611 * Callback vectors for replaying records. 612 * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 613 */ 614 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 615 zvol_replay_err, /* 0 no such transaction type */ 616 zvol_replay_err, /* TX_CREATE */ 617 zvol_replay_err, /* TX_MKDIR */ 618 zvol_replay_err, /* TX_MKXATTR */ 619 zvol_replay_err, /* TX_SYMLINK */ 620 zvol_replay_err, /* TX_REMOVE */ 621 zvol_replay_err, /* TX_RMDIR */ 622 zvol_replay_err, /* TX_LINK */ 623 zvol_replay_err, /* TX_RENAME */ 624 zvol_replay_write, /* TX_WRITE */ 625 zvol_replay_truncate, /* TX_TRUNCATE */ 626 zvol_replay_err, /* TX_SETATTR */ 627 zvol_replay_err, /* TX_ACL */ 628 zvol_replay_err, /* TX_CREATE_ACL */ 629 zvol_replay_err, /* TX_CREATE_ATTR */ 630 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 631 zvol_replay_err, /* TX_MKDIR_ACL */ 632 zvol_replay_err, /* TX_MKDIR_ATTR */ 633 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 634 zvol_replay_err, /* TX_WRITE2 */ 635 }; 636 637 #ifdef illumos 638 int 639 zvol_name2minor(const char *name, minor_t *minor) 640 { 641 zvol_state_t *zv; 642 643 mutex_enter(&zfsdev_state_lock); 644 zv = zvol_minor_lookup(name); 645 if (minor && zv) 646 *minor = zv->zv_minor; 647 mutex_exit(&zfsdev_state_lock); 648 return (zv ? 0 : -1); 649 } 650 #endif /* illumos */ 651 652 /* 653 * Create a minor node (plus a whole lot more) for the specified volume. 654 */ 655 int 656 zvol_create_minor(const char *name) 657 { 658 zfs_soft_state_t *zs; 659 zvol_state_t *zv; 660 objset_t *os; 661 int error; 662 #ifdef illumos 663 dmu_object_info_t doi; 664 minor_t minor = 0; 665 char chrbuf[30], blkbuf[30]; 666 #endif 667 #ifdef __FreeBSD__ 668 struct g_provider *pp; 669 struct g_geom *gp; 670 uint64_t mode; 671 672 ZFS_LOG(1, "Creating ZVOL %s...", name); 673 #endif 674 #ifdef __NetBSD__ 675 dmu_object_info_t doi; 676 minor_t minor = 0; 677 vnode_t *vp = NULL; 678 char *devpath; 679 size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1; 680 #endif 681 682 mutex_enter(&zfsdev_state_lock); 683 684 if (zvol_minor_lookup(name) != NULL) { 685 mutex_exit(&zfsdev_state_lock); 686 return (SET_ERROR(EEXIST)); 687 } 688 689 /* lie and say we're read-only */ 690 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); 691 692 if (error) { 693 mutex_exit(&zfsdev_state_lock); 694 return (error); 695 } 696 697 #ifdef illumos 698 if ((minor = zfsdev_minor_alloc()) == 0) { 699 dmu_objset_disown(os, FTAG); 700 mutex_exit(&zfsdev_state_lock); 701 return (SET_ERROR(ENXIO)); 702 } 703 704 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 705 dmu_objset_disown(os, FTAG); 706 mutex_exit(&zfsdev_state_lock); 707 return (SET_ERROR(EAGAIN)); 708 } 709 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 710 (char *)name); 711 712 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 713 714 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 715 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 716 ddi_soft_state_free(zfsdev_state, minor); 717 dmu_objset_disown(os, FTAG); 718 mutex_exit(&zfsdev_state_lock); 719 return (SET_ERROR(EAGAIN)); 720 } 721 722 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 723 724 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 725 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 726 ddi_remove_minor_node(zfs_dip, chrbuf); 727 ddi_soft_state_free(zfsdev_state, minor); 728 dmu_objset_disown(os, FTAG); 729 mutex_exit(&zfsdev_state_lock); 730 return (SET_ERROR(EAGAIN)); 731 } 732 733 zs = ddi_get_soft_state(zfsdev_state, minor); 734 zs->zss_type = ZSST_ZVOL; 735 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 736 #endif /* illumos */ 737 738 #ifdef __FreeBSD__ 739 zv = kmem_zalloc(sizeof(*zv), KM_SLEEP); 740 zv->zv_state = 0; 741 error = dsl_prop_get_integer(name, 742 zfs_prop_to_name(ZFS_PROP_VOLMODE), &mode, NULL); 743 if (error != 0 || mode == ZFS_VOLMODE_DEFAULT) 744 mode = volmode; 745 746 DROP_GIANT(); 747 zv->zv_volmode = mode; 748 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 749 g_topology_lock(); 750 gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name); 751 gp->start = zvol_geom_start; 752 gp->access = zvol_geom_access; 753 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name); 754 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND; 755 pp->sectorsize = DEV_BSIZE; 756 pp->mediasize = 0; 757 pp->private = zv; 758 759 zv->zv_provider = pp; 760 bioq_init(&zv->zv_queue); 761 mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF); 762 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) { 763 struct make_dev_args args; 764 765 make_dev_args_init(&args); 766 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 767 args.mda_devsw = &zvol_cdevsw; 768 args.mda_cr = NULL; 769 args.mda_uid = UID_ROOT; 770 args.mda_gid = GID_OPERATOR; 771 args.mda_mode = 0640; 772 args.mda_si_drv2 = zv; 773 error = make_dev_s(&args, &zv->zv_dev, 774 "%s/%s", ZVOL_DRIVER, name); 775 if (error != 0) { 776 kmem_free(zv, sizeof(*zv)); 777 dmu_objset_disown(os, FTAG); 778 mutex_exit(&zfsdev_state_lock); 779 return (error); 780 } 781 zv->zv_dev->si_iosize_max = MAXPHYS; 782 } 783 LIST_INSERT_HEAD(&all_zvols, zv, zv_links); 784 #endif /* __FreeBSD__ */ 785 786 #ifdef __NetBSD__ 787 788 /* 789 * If there's an existing /dev/zvol symlink, try to use the 790 * same minor number we used last time. 791 */ 792 devpath = kmem_alloc(devpathlen, KM_SLEEP); 793 794 /* Get full path to ZFS volume disk device */ 795 (void) snprintf(devpath, devpathlen, "%s/%s", ZVOL_FULL_DEV_DIR, name); 796 797 error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 798 799 if (error == 0 && vp->v_type != VBLK) { 800 error = EINVAL; 801 } 802 803 if (error == 0) { 804 struct stat sb; 805 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 806 error = vn_stat(vp, &sb); 807 VOP_UNLOCK(vp, 0); 808 if (error == 0) { 809 minor = getminor(sb.st_rdev); 810 } 811 } 812 813 if (vp != NULL) 814 VN_RELE(vp); 815 816 /* 817 * If we found a minor but it's already in use, we must pick a new one. 818 */ 819 820 if (minor != 0 && zfsdev_get_soft_state(minor, ZSST_ZVOL) != NULL) 821 minor = 0; 822 823 if (minor == 0) 824 minor = zfsdev_minor_alloc(); 825 826 if (minor == 0) { 827 dmu_objset_disown(os, zvol_tag); 828 mutex_exit(&zfsdev_state_lock); 829 kmem_free(devpath, devpathlen); 830 return (ENXIO); 831 } 832 833 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 834 dmu_objset_disown(os, zvol_tag); 835 mutex_exit(&zfsdev_state_lock); 836 kmem_free(devpath, devpathlen); 837 return (EAGAIN); 838 } 839 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 840 (char *)name); 841 842 if (ddi_create_minor_node(zfs_dip, (char *)name, S_IFCHR, 843 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 844 ddi_soft_state_free(zfsdev_state, minor); 845 dmu_objset_disown(os, zvol_tag); 846 mutex_exit(&zfsdev_state_lock); 847 kmem_free(devpath, devpathlen); 848 return (EAGAIN); 849 } 850 851 if (ddi_create_minor_node(zfs_dip, (char *)name, S_IFBLK, 852 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 853 ddi_remove_minor_node(zfs_dip, (char *)name); 854 ddi_soft_state_free(zfsdev_state, minor); 855 dmu_objset_disown(os, zvol_tag); 856 mutex_exit(&zfsdev_state_lock); 857 kmem_free(devpath, devpathlen); 858 return (EAGAIN); 859 } 860 zs = ddi_get_soft_state(zfsdev_state, minor); 861 zs->zss_type = ZSST_ZVOL; 862 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 863 864 disk_init(&zv->zv_dk, name, &zvol_dkdriver); 865 disk_attach(&zv->zv_dk); 866 mutex_init(&zv->zv_dklock, NULL, MUTEX_DEFAULT, NULL); 867 868 LIST_INSERT_HEAD(&all_zvols, zv, zv_links); 869 #endif /* __NetBSD__ */ 870 871 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 872 zv->zv_min_bs = DEV_BSHIFT; 873 #ifdef illumos 874 zv->zv_minor = minor; 875 #endif 876 zv->zv_objset = os; 877 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 878 zv->zv_flags |= ZVOL_RDONLY; 879 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 880 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 881 sizeof (rl_t), offsetof(rl_t, r_node)); 882 list_create(&zv->zv_extents, sizeof (zvol_extent_t), 883 offsetof(zvol_extent_t, ze_node)); 884 #if defined(illumos) || defined(__NetBSD__) 885 /* get and cache the blocksize */ 886 error = dmu_object_info(os, ZVOL_OBJ, &doi); 887 ASSERT(error == 0); 888 zv->zv_volblocksize = doi.doi_data_block_size; 889 #endif 890 891 if (spa_writeable(dmu_objset_spa(os))) { 892 if (zil_replay_disable) 893 zil_destroy(dmu_objset_zil(os), B_FALSE); 894 else 895 zil_replay(os, zv, zvol_replay_vector); 896 } 897 dmu_objset_disown(os, FTAG); 898 zv->zv_objset = NULL; 899 900 zvol_minors++; 901 902 mutex_exit(&zfsdev_state_lock); 903 #ifdef __FreeBSD__ 904 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 905 zvol_geom_run(zv); 906 g_topology_unlock(); 907 } 908 PICKUP_GIANT(); 909 910 ZFS_LOG(1, "ZVOL %s created.", name); 911 #endif 912 return (0); 913 } 914 915 /* 916 * Remove minor node for the specified volume. 917 */ 918 static int 919 zvol_remove_zv(zvol_state_t *zv) 920 { 921 922 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 923 if (zv->zv_total_opens != 0) 924 return (SET_ERROR(EBUSY)); 925 926 #ifdef illumos 927 char nmbuf[20]; 928 minor_t minor = zv->zv_minor; 929 930 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 931 ddi_remove_minor_node(zfs_dip, nmbuf); 932 933 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 934 ddi_remove_minor_node(zfs_dip, nmbuf); 935 #endif 936 #ifdef __FreeBSD__ 937 ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name); 938 939 LIST_REMOVE(zv, zv_links); 940 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 941 g_topology_lock(); 942 zvol_geom_destroy(zv); 943 g_topology_unlock(); 944 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) { 945 if (zv->zv_dev != NULL) 946 destroy_dev(zv->zv_dev); 947 } 948 #endif 949 #ifdef __NetBSD__ 950 char nmbuf[20]; 951 minor_t minor = zv->zv_minor; 952 953 /* XXXNETBSD needs changes here */ 954 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", zv->zv_minor); 955 ddi_remove_minor_node(zfs_dip, nmbuf); 956 957 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", zv->zv_minor); 958 ddi_remove_minor_node(zfs_dip, nmbuf); 959 #endif 960 961 avl_destroy(&zv->zv_znode.z_range_avl); 962 mutex_destroy(&zv->zv_znode.z_range_lock); 963 964 kmem_free(zv, sizeof (zvol_state_t)); 965 #ifdef illumos 966 ddi_soft_state_free(zfsdev_state, minor); 967 #endif 968 #ifdef __NetBSD__ 969 ddi_soft_state_free(zfsdev_state, minor); 970 #endif 971 zvol_minors--; 972 return (0); 973 } 974 975 int 976 zvol_remove_minor(const char *name) 977 { 978 zvol_state_t *zv; 979 int rc; 980 981 mutex_enter(&zfsdev_state_lock); 982 if ((zv = zvol_minor_lookup(name)) == NULL) { 983 mutex_exit(&zfsdev_state_lock); 984 return (SET_ERROR(ENXIO)); 985 } 986 rc = zvol_remove_zv(zv); 987 mutex_exit(&zfsdev_state_lock); 988 return (rc); 989 } 990 991 int 992 zvol_first_open(zvol_state_t *zv) 993 { 994 dmu_object_info_t doi; 995 objset_t *os; 996 uint64_t volsize; 997 int error; 998 uint64_t readonly; 999 1000 /* lie and say we're read-only */ 1001 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 1002 zvol_tag, &os); 1003 if (error) 1004 return (error); 1005 1006 zv->zv_objset = os; 1007 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 1008 if (error) { 1009 ASSERT(error == 0); 1010 dmu_objset_disown(os, zvol_tag); 1011 return (error); 1012 } 1013 1014 /* get and cache the blocksize */ 1015 error = dmu_object_info(os, ZVOL_OBJ, &doi); 1016 if (error) { 1017 ASSERT(error == 0); 1018 dmu_objset_disown(os, zvol_tag); 1019 return (error); 1020 } 1021 zv->zv_volblocksize = doi.doi_data_block_size; 1022 1023 error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf); 1024 if (error) { 1025 dmu_objset_disown(os, zvol_tag); 1026 return (error); 1027 } 1028 1029 zvol_size_changed(zv, volsize); 1030 zv->zv_zilog = zil_open(os, zvol_get_data); 1031 1032 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 1033 NULL) == 0); 1034 if (readonly || dmu_objset_is_snapshot(os) || 1035 !spa_writeable(dmu_objset_spa(os))) 1036 zv->zv_flags |= ZVOL_RDONLY; 1037 else 1038 zv->zv_flags &= ~ZVOL_RDONLY; 1039 return (error); 1040 } 1041 1042 void 1043 zvol_last_close(zvol_state_t *zv) 1044 { 1045 zil_close(zv->zv_zilog); 1046 zv->zv_zilog = NULL; 1047 1048 dmu_buf_rele(zv->zv_dbuf, zvol_tag); 1049 zv->zv_dbuf = NULL; 1050 1051 /* 1052 * Evict cached data 1053 */ 1054 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && 1055 !(zv->zv_flags & ZVOL_RDONLY)) 1056 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1057 dmu_objset_evict_dbufs(zv->zv_objset); 1058 1059 dmu_objset_disown(zv->zv_objset, zvol_tag); 1060 zv->zv_objset = NULL; 1061 #ifdef __NetBSD__xxx 1062 /* the old code has this here, but it's in the wrong place. */ 1063 disk_detach(&zv->zv_dk); 1064 disk_destroy(&zv->zv_dk); 1065 mutex_destroy(&zv->zv_dklock); 1066 #endif 1067 } 1068 1069 #ifdef illumos 1070 int 1071 zvol_prealloc(zvol_state_t *zv) 1072 { 1073 objset_t *os = zv->zv_objset; 1074 dmu_tx_t *tx; 1075 uint64_t refd, avail, usedobjs, availobjs; 1076 uint64_t resid = zv->zv_volsize; 1077 uint64_t off = 0; 1078 1079 /* Check the space usage before attempting to allocate the space */ 1080 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 1081 if (avail < zv->zv_volsize) 1082 return (SET_ERROR(ENOSPC)); 1083 1084 /* Free old extents if they exist */ 1085 zvol_free_extents(zv); 1086 1087 while (resid != 0) { 1088 int error; 1089 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE); 1090 1091 tx = dmu_tx_create(os); 1092 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1093 error = dmu_tx_assign(tx, TXG_WAIT); 1094 if (error) { 1095 dmu_tx_abort(tx); 1096 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 1097 return (error); 1098 } 1099 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 1100 dmu_tx_commit(tx); 1101 off += bytes; 1102 resid -= bytes; 1103 } 1104 txg_wait_synced(dmu_objset_pool(os), 0); 1105 1106 return (0); 1107 } 1108 #endif /* illumos */ 1109 1110 static int 1111 zvol_update_volsize(objset_t *os, uint64_t volsize) 1112 { 1113 dmu_tx_t *tx; 1114 int error; 1115 1116 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1117 1118 tx = dmu_tx_create(os); 1119 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1120 dmu_tx_mark_netfree(tx); 1121 error = dmu_tx_assign(tx, TXG_WAIT); 1122 if (error) { 1123 dmu_tx_abort(tx); 1124 return (error); 1125 } 1126 1127 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 1128 &volsize, tx); 1129 dmu_tx_commit(tx); 1130 1131 if (error == 0) 1132 error = dmu_free_long_range(os, 1133 ZVOL_OBJ, volsize, DMU_OBJECT_END); 1134 return (error); 1135 } 1136 1137 void 1138 zvol_remove_minors(const char *name) 1139 { 1140 #ifdef illumos 1141 zvol_state_t *zv; 1142 char *namebuf; 1143 minor_t minor; 1144 1145 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 1146 (void) strncpy(namebuf, name, strlen(name)); 1147 (void) strcat(namebuf, "/"); 1148 mutex_enter(&zfsdev_state_lock); 1149 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 1150 1151 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1152 if (zv == NULL) 1153 continue; 1154 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 1155 (void) zvol_remove_zv(zv); 1156 } 1157 kmem_free(namebuf, strlen(name) + 2); 1158 1159 mutex_exit(&zfsdev_state_lock); 1160 #else /* !illumos */ 1161 zvol_state_t *zv, *tzv; 1162 size_t namelen; 1163 1164 namelen = strlen(name); 1165 1166 DROP_GIANT(); 1167 mutex_enter(&zfsdev_state_lock); 1168 1169 LIST_FOREACH_SAFE(zv, &all_zvols, zv_links, tzv) { 1170 if (strcmp(zv->zv_name, name) == 0 || 1171 (strncmp(zv->zv_name, name, namelen) == 0 && 1172 strlen(zv->zv_name) > namelen && (zv->zv_name[namelen] == '/' || 1173 zv->zv_name[namelen] == '@'))) { 1174 (void) zvol_remove_zv(zv); 1175 } 1176 } 1177 1178 mutex_exit(&zfsdev_state_lock); 1179 PICKUP_GIANT(); 1180 #endif /* illumos */ 1181 } 1182 1183 static int 1184 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) 1185 { 1186 uint64_t old_volsize = 0ULL; 1187 int error = 0; 1188 1189 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1190 1191 /* 1192 * Reinitialize the dump area to the new size. If we 1193 * failed to resize the dump area then restore it back to 1194 * its original size. We must set the new volsize prior 1195 * to calling dumpvp_resize() to ensure that the devices' 1196 * size(9P) is not visible by the dump subsystem. 1197 */ 1198 old_volsize = zv->zv_volsize; 1199 zvol_size_changed(zv, volsize); 1200 1201 #ifdef ZVOL_DUMP 1202 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1203 if ((error = zvol_dumpify(zv)) != 0 || 1204 (error = dumpvp_resize()) != 0) { 1205 int dumpify_error; 1206 1207 (void) zvol_update_volsize(zv->zv_objset, old_volsize); 1208 zvol_size_changed(zv, old_volsize); 1209 dumpify_error = zvol_dumpify(zv); 1210 error = dumpify_error ? dumpify_error : error; 1211 } 1212 } 1213 #endif /* ZVOL_DUMP */ 1214 1215 #ifdef illumos 1216 /* 1217 * Generate a LUN expansion event. 1218 */ 1219 if (error == 0) { 1220 sysevent_id_t eid; 1221 nvlist_t *attr; 1222 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 1223 1224 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 1225 zv->zv_minor); 1226 1227 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1228 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 1229 1230 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 1231 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 1232 1233 nvlist_free(attr); 1234 kmem_free(physpath, MAXPATHLEN); 1235 } 1236 #endif /* illumos */ 1237 return (error); 1238 } 1239 1240 int 1241 zvol_set_volsize(const char *name, uint64_t volsize) 1242 { 1243 zvol_state_t *zv = NULL; 1244 objset_t *os; 1245 int error; 1246 dmu_object_info_t doi; 1247 uint64_t readonly; 1248 boolean_t owned = B_FALSE; 1249 1250 error = dsl_prop_get_integer(name, 1251 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); 1252 if (error != 0) 1253 return (error); 1254 if (readonly) 1255 return (SET_ERROR(EROFS)); 1256 1257 mutex_enter(&zfsdev_state_lock); 1258 zv = zvol_minor_lookup(name); 1259 1260 if (zv == NULL || zv->zv_objset == NULL) { 1261 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, 1262 FTAG, &os)) != 0) { 1263 mutex_exit(&zfsdev_state_lock); 1264 return (error); 1265 } 1266 owned = B_TRUE; 1267 if (zv != NULL) 1268 zv->zv_objset = os; 1269 } else { 1270 os = zv->zv_objset; 1271 } 1272 1273 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 1274 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0) 1275 goto out; 1276 1277 error = zvol_update_volsize(os, volsize); 1278 1279 if (error == 0 && zv != NULL) 1280 error = zvol_update_live_volsize(zv, volsize); 1281 out: 1282 if (owned) { 1283 dmu_objset_disown(os, FTAG); 1284 if (zv != NULL) 1285 zv->zv_objset = NULL; 1286 } 1287 mutex_exit(&zfsdev_state_lock); 1288 return (error); 1289 } 1290 1291 /*ARGSUSED*/ 1292 #ifdef illumos 1293 int 1294 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 1295 #endif 1296 #ifdef __FreeBSD__ 1297 static int 1298 zvol_open(struct g_provider *pp, int flag, int count) 1299 #endif 1300 #ifdef __NetBSD__ 1301 int 1302 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 1303 #endif 1304 { 1305 zvol_state_t *zv; 1306 int err = 0; 1307 1308 #ifdef illumos 1309 mutex_enter(&zfsdev_state_lock); 1310 1311 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 1312 if (zv == NULL) { 1313 mutex_exit(&zfsdev_state_lock); 1314 return (SET_ERROR(ENXIO)); 1315 } 1316 1317 if (zv->zv_total_opens == 0) 1318 err = zvol_first_open(zv); 1319 if (err) { 1320 mutex_exit(&zfsdev_state_lock); 1321 return (err); 1322 } 1323 #endif /* !illumos */ 1324 #ifdef __FreeBSD__ 1325 boolean_t locked = B_FALSE; 1326 1327 if (!zpool_on_zvol && tsd_get(zfs_geom_probe_vdev_key) != NULL) { 1328 /* 1329 * if zfs_geom_probe_vdev_key is set, that means that zfs is 1330 * attempting to probe geom providers while looking for a 1331 * replacement for a missing VDEV. In this case, the 1332 * spa_namespace_lock will not be held, but it is still illegal 1333 * to use a zvol as a vdev. Deadlocks can result if another 1334 * thread has spa_namespace_lock 1335 */ 1336 return (EOPNOTSUPP); 1337 } 1338 /* 1339 * Protect against recursively entering spa_namespace_lock 1340 * when spa_open() is used for a pool on a (local) ZVOL(s). 1341 * This is needed since we replaced upstream zfsdev_state_lock 1342 * with spa_namespace_lock in the ZVOL code. 1343 * We are using the same trick as spa_open(). 1344 * Note that calls in zvol_first_open which need to resolve 1345 * pool name to a spa object will enter spa_open() 1346 * recursively, but that function already has all the 1347 * necessary protection. 1348 */ 1349 if (!MUTEX_HELD(&zfsdev_state_lock)) { 1350 mutex_enter(&zfsdev_state_lock); 1351 locked = B_TRUE; 1352 } 1353 1354 zv = pp->private; 1355 if (zv == NULL) { 1356 if (locked) 1357 mutex_exit(&zfsdev_state_lock); 1358 return (SET_ERROR(ENXIO)); 1359 } 1360 1361 if (zv->zv_total_opens == 0) { 1362 err = zvol_first_open(zv); 1363 if (err) { 1364 if (locked) 1365 mutex_exit(&zfsdev_state_lock); 1366 return (err); 1367 } 1368 pp->mediasize = zv->zv_volsize; 1369 pp->stripeoffset = 0; 1370 pp->stripesize = zv->zv_volblocksize; 1371 } 1372 #endif /* __FreeBSD__ */ 1373 #ifdef __NetBSD__ 1374 mutex_enter(&zfsdev_state_lock); 1375 1376 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 1377 if (zv == NULL) { 1378 mutex_exit(&zfsdev_state_lock); 1379 return (SET_ERROR(ENXIO)); 1380 } 1381 1382 if (zv->zv_total_opens == 0) 1383 err = zvol_first_open(zv); 1384 if (err) { 1385 mutex_exit(&zfsdev_state_lock); 1386 return (err); 1387 } 1388 #endif 1389 1390 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 1391 err = SET_ERROR(EROFS); 1392 goto out; 1393 } 1394 if (zv->zv_flags & ZVOL_EXCL) { 1395 err = SET_ERROR(EBUSY); 1396 goto out; 1397 } 1398 #ifdef FEXCL 1399 if (flag & FEXCL) { 1400 if (zv->zv_total_opens != 0) { 1401 err = SET_ERROR(EBUSY); 1402 goto out; 1403 } 1404 zv->zv_flags |= ZVOL_EXCL; 1405 } 1406 #endif 1407 1408 #ifdef illumos 1409 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 1410 zv->zv_open_count[otyp]++; 1411 zv->zv_total_opens++; 1412 } 1413 mutex_exit(&zfsdev_state_lock); 1414 #endif 1415 #ifdef __FreeBSD__ 1416 zv->zv_total_opens += count; 1417 if (locked) 1418 mutex_exit(&zfsdev_state_lock); 1419 #endif 1420 #ifdef __NetBSD__ 1421 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 1422 zv->zv_open_count[otyp]++; 1423 zv->zv_total_opens++; 1424 } 1425 mutex_exit(&zfsdev_state_lock); 1426 #endif 1427 1428 return (err); 1429 out: 1430 if (zv->zv_total_opens == 0) 1431 zvol_last_close(zv); 1432 #ifdef __FreeBSD__ 1433 if (locked) 1434 #endif 1435 mutex_exit(&zfsdev_state_lock); 1436 1437 return (err); 1438 } 1439 1440 /*ARGSUSED*/ 1441 #if defined(illumos) || defined(__NetBSD__) 1442 int 1443 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 1444 #endif 1445 #ifdef __FreeBSD__ 1446 static int 1447 zvol_close(struct g_provider *pp, int flag, int count) 1448 #endif 1449 { 1450 #if defined(illumos) || defined(__NetBSD__) 1451 minor_t minor = getminor(dev); 1452 zvol_state_t *zv; 1453 int error = 0; 1454 1455 mutex_enter(&zfsdev_state_lock); 1456 1457 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1458 if (zv == NULL) { 1459 mutex_exit(&zfsdev_state_lock); 1460 return (SET_ERROR(ENXIO)); 1461 } 1462 #endif /* illumos */ 1463 #ifdef __FreeBSD__ 1464 zvol_state_t *zv; 1465 int error = 0; 1466 boolean_t locked = B_FALSE; 1467 1468 /* See comment in zvol_open(). */ 1469 if (!MUTEX_HELD(&zfsdev_state_lock)) { 1470 mutex_enter(&zfsdev_state_lock); 1471 locked = B_TRUE; 1472 } 1473 1474 zv = pp->private; 1475 if (zv == NULL) { 1476 if (locked) 1477 mutex_exit(&zfsdev_state_lock); 1478 return (SET_ERROR(ENXIO)); 1479 } 1480 #endif /* __FreeBSD__ */ 1481 1482 if (zv->zv_flags & ZVOL_EXCL) { 1483 ASSERT(zv->zv_total_opens == 1); 1484 zv->zv_flags &= ~ZVOL_EXCL; 1485 } 1486 1487 /* 1488 * If the open count is zero, this is a spurious close. 1489 * That indicates a bug in the kernel / DDI framework. 1490 */ 1491 #if defined(illumos) || defined(__NetBSD__) 1492 ASSERT(zv->zv_open_count[otyp] != 0); 1493 #endif 1494 ASSERT(zv->zv_total_opens != 0); 1495 1496 /* 1497 * You may get multiple opens, but only one close. 1498 */ 1499 #if defined(illumos) || defined(__NetBSD__) 1500 zv->zv_open_count[otyp]--; 1501 zv->zv_total_opens--; 1502 #else 1503 zv->zv_total_opens -= count; 1504 #endif 1505 1506 if (zv->zv_total_opens == 0) 1507 zvol_last_close(zv); 1508 1509 #if defined(illumos) || defined(__NetBSD__) 1510 mutex_exit(&zfsdev_state_lock); 1511 #else 1512 if (locked) 1513 mutex_exit(&zfsdev_state_lock); 1514 #endif 1515 return (error); 1516 } 1517 1518 static void 1519 zvol_get_done(zgd_t *zgd, int error) 1520 { 1521 if (zgd->zgd_db) 1522 dmu_buf_rele(zgd->zgd_db, zgd); 1523 1524 zfs_range_unlock(zgd->zgd_rl); 1525 1526 if (error == 0 && zgd->zgd_bp) 1527 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 1528 1529 kmem_free(zgd, sizeof (zgd_t)); 1530 } 1531 1532 /* 1533 * Get data to generate a TX_WRITE intent log record. 1534 */ 1535 static int 1536 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 1537 { 1538 zvol_state_t *zv = arg; 1539 objset_t *os = zv->zv_objset; 1540 uint64_t object = ZVOL_OBJ; 1541 uint64_t offset = lr->lr_offset; 1542 uint64_t size = lr->lr_length; /* length of user data */ 1543 blkptr_t *bp = &lr->lr_blkptr; 1544 dmu_buf_t *db; 1545 zgd_t *zgd; 1546 int error; 1547 1548 ASSERT(zio != NULL); 1549 ASSERT(size != 0); 1550 1551 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1552 zgd->zgd_zilog = zv->zv_zilog; 1553 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); 1554 1555 /* 1556 * Write records come in two flavors: immediate and indirect. 1557 * For small writes it's cheaper to store the data with the 1558 * log record (immediate); for large writes it's cheaper to 1559 * sync the data and get a pointer to it (indirect) so that 1560 * we don't have to write the data twice. 1561 */ 1562 if (buf != NULL) { /* immediate write */ 1563 error = dmu_read(os, object, offset, size, buf, 1564 DMU_READ_NO_PREFETCH); 1565 } else { 1566 size = zv->zv_volblocksize; 1567 offset = P2ALIGN(offset, size); 1568 error = dmu_buf_hold(os, object, offset, zgd, &db, 1569 DMU_READ_NO_PREFETCH); 1570 if (error == 0) { 1571 blkptr_t *obp = dmu_buf_get_blkptr(db); 1572 if (obp) { 1573 ASSERT(BP_IS_HOLE(bp)); 1574 *bp = *obp; 1575 } 1576 1577 zgd->zgd_db = db; 1578 zgd->zgd_bp = bp; 1579 1580 ASSERT(db->db_offset == offset); 1581 ASSERT(db->db_size == size); 1582 1583 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1584 zvol_get_done, zgd); 1585 1586 if (error == 0) 1587 return (0); 1588 } 1589 } 1590 1591 zvol_get_done(zgd, error); 1592 1593 return (error); 1594 } 1595 1596 /* 1597 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 1598 * 1599 * We store data in the log buffers if it's small enough. 1600 * Otherwise we will later flush the data out via dmu_sync(). 1601 */ 1602 ssize_t zvol_immediate_write_sz = 32768; 1603 #ifdef _KERNEL 1604 SYSCTL_LONG(_vfs_zfs_vol, OID_AUTO, immediate_write_sz, CTLFLAG_RWTUN, 1605 &zvol_immediate_write_sz, 0, "Minimal size for indirect log write"); 1606 #endif 1607 1608 static void 1609 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1610 boolean_t sync) 1611 { 1612 uint32_t blocksize = zv->zv_volblocksize; 1613 zilog_t *zilog = zv->zv_zilog; 1614 itx_wr_state_t write_state; 1615 1616 if (zil_replaying(zilog, tx)) 1617 return; 1618 1619 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1620 write_state = WR_INDIRECT; 1621 else if (!spa_has_slogs(zilog->zl_spa) && 1622 resid >= blocksize && blocksize > zvol_immediate_write_sz) 1623 write_state = WR_INDIRECT; 1624 else if (sync) 1625 write_state = WR_COPIED; 1626 else 1627 write_state = WR_NEED_COPY; 1628 1629 while (resid) { 1630 itx_t *itx; 1631 lr_write_t *lr; 1632 itx_wr_state_t wr_state = write_state; 1633 ssize_t len = resid; 1634 1635 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) 1636 wr_state = WR_NEED_COPY; 1637 else if (wr_state == WR_INDIRECT) 1638 len = MIN(blocksize - P2PHASE(off, blocksize), resid); 1639 1640 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1641 (wr_state == WR_COPIED ? len : 0)); 1642 lr = (lr_write_t *)&itx->itx_lr; 1643 if (wr_state == WR_COPIED && dmu_read(zv->zv_objset, 1644 ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1645 zil_itx_destroy(itx); 1646 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1647 lr = (lr_write_t *)&itx->itx_lr; 1648 wr_state = WR_NEED_COPY; 1649 } 1650 1651 itx->itx_wr_state = wr_state; 1652 lr->lr_foid = ZVOL_OBJ; 1653 lr->lr_offset = off; 1654 lr->lr_length = len; 1655 lr->lr_blkoff = 0; 1656 BP_ZERO(&lr->lr_blkptr); 1657 1658 itx->itx_private = zv; 1659 1660 if (!sync && (zv->zv_sync_cnt == 0)) 1661 itx->itx_sync = B_FALSE; 1662 1663 zil_itx_assign(zilog, itx, tx); 1664 1665 off += len; 1666 resid -= len; 1667 } 1668 } 1669 1670 #ifdef illumos 1671 static int 1672 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset, 1673 uint64_t size, boolean_t doread, boolean_t isdump) 1674 { 1675 vdev_disk_t *dvd; 1676 int c; 1677 int numerrors = 0; 1678 1679 if (vd->vdev_ops == &vdev_mirror_ops || 1680 vd->vdev_ops == &vdev_replacing_ops || 1681 vd->vdev_ops == &vdev_spare_ops) { 1682 for (c = 0; c < vd->vdev_children; c++) { 1683 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1684 addr, offset, origoffset, size, doread, isdump); 1685 if (err != 0) { 1686 numerrors++; 1687 } else if (doread) { 1688 break; 1689 } 1690 } 1691 } 1692 1693 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops) 1694 return (numerrors < vd->vdev_children ? 0 : EIO); 1695 1696 if (doread && !vdev_readable(vd)) 1697 return (SET_ERROR(EIO)); 1698 else if (!doread && !vdev_writeable(vd)) 1699 return (SET_ERROR(EIO)); 1700 1701 if (vd->vdev_ops == &vdev_raidz_ops) { 1702 return (vdev_raidz_physio(vd, 1703 addr, size, offset, origoffset, doread, isdump)); 1704 } 1705 1706 offset += VDEV_LABEL_START_SIZE; 1707 1708 if (ddi_in_panic() || isdump) { 1709 ASSERT(!doread); 1710 if (doread) 1711 return (SET_ERROR(EIO)); 1712 dvd = vd->vdev_tsd; 1713 ASSERT3P(dvd, !=, NULL); 1714 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1715 lbtodb(size))); 1716 } else { 1717 dvd = vd->vdev_tsd; 1718 ASSERT3P(dvd, !=, NULL); 1719 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size, 1720 offset, doread ? B_READ : B_WRITE)); 1721 } 1722 } 1723 1724 static int 1725 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1726 boolean_t doread, boolean_t isdump) 1727 { 1728 vdev_t *vd; 1729 int error; 1730 zvol_extent_t *ze; 1731 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1732 1733 /* Must be sector aligned, and not stradle a block boundary. */ 1734 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1735 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1736 return (SET_ERROR(EINVAL)); 1737 } 1738 ASSERT(size <= zv->zv_volblocksize); 1739 1740 /* Locate the extent this belongs to */ 1741 ze = list_head(&zv->zv_extents); 1742 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1743 offset -= ze->ze_nblks * zv->zv_volblocksize; 1744 ze = list_next(&zv->zv_extents, ze); 1745 } 1746 1747 if (ze == NULL) 1748 return (SET_ERROR(EINVAL)); 1749 1750 if (!ddi_in_panic()) 1751 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1752 1753 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1754 offset += DVA_GET_OFFSET(&ze->ze_dva); 1755 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva), 1756 size, doread, isdump); 1757 1758 if (!ddi_in_panic()) 1759 spa_config_exit(spa, SCL_STATE, FTAG); 1760 1761 return (error); 1762 } 1763 #else /* !illumos */ 1764 static inline int 1765 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1766 boolean_t doread, boolean_t isdump) 1767 { 1768 return 0; 1769 } 1770 #endif /* illumos */ 1771 1772 #ifdef illumos 1773 int 1774 zvol_strategy(buf_t *bp) 1775 #endif 1776 #ifdef __FreeBSD__ 1777 void 1778 zvol_strategy(struct bio *bp) 1779 #endif 1780 #ifdef __NetBSD__ 1781 void 1782 zvol_strategy(buf_t *bp) 1783 #endif 1784 { 1785 zvol_state_t *zv; 1786 uint64_t off, volsize; 1787 size_t resid; 1788 char *addr; 1789 objset_t *os; 1790 rl_t *rl; 1791 int error = 0; 1792 #ifdef illumos 1793 boolean_t doread = bp->b_flags & B_READ; 1794 #else 1795 boolean_t doread = 0; 1796 #endif 1797 boolean_t is_dumpified; 1798 boolean_t sync; 1799 1800 #ifdef illumos 1801 zfs_soft_state_t *zs = NULL; 1802 1803 if (getminor(bp->b_edev) == 0) { 1804 error = SET_ERROR(EINVAL); 1805 } else { 1806 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1807 if (zs == NULL) 1808 error = SET_ERROR(ENXIO); 1809 else if (zs->zss_type != ZSST_ZVOL) 1810 error = SET_ERROR(EINVAL); 1811 } 1812 1813 if (error) { 1814 bioerror(bp, error); 1815 biodone(bp); 1816 return (0); 1817 } 1818 1819 zv = zs->zss_data; 1820 1821 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1822 bioerror(bp, EROFS); 1823 biodone(bp); 1824 return (0); 1825 } 1826 1827 off = ldbtob(bp->b_blkno); 1828 #endif /* illumos */ 1829 #ifdef __FreeBSD__ 1830 if (bp->bio_to) 1831 zv = bp->bio_to->private; 1832 else 1833 zv = bp->bio_dev->si_drv2; 1834 1835 if (zv == NULL) { 1836 error = SET_ERROR(ENXIO); 1837 goto out; 1838 } 1839 1840 if (bp->bio_cmd != BIO_READ && (zv->zv_flags & ZVOL_RDONLY)) { 1841 error = SET_ERROR(EROFS); 1842 goto out; 1843 } 1844 1845 switch (bp->bio_cmd) { 1846 case BIO_FLUSH: 1847 goto sync; 1848 case BIO_READ: 1849 doread = 1; 1850 case BIO_WRITE: 1851 case BIO_DELETE: 1852 break; 1853 default: 1854 error = EOPNOTSUPP; 1855 goto out; 1856 } 1857 1858 off = bp->bio_offset; 1859 #endif /* __FreeBSD__ */ 1860 #ifdef __NetBSD__ 1861 zfs_soft_state_t *zs = NULL; 1862 1863 if (getminor(bp->b_edev) == 0) { 1864 error = SET_ERROR(EINVAL); 1865 } else { 1866 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1867 if (zs == NULL) 1868 error = SET_ERROR(ENXIO); 1869 else if (zs->zss_type != ZSST_ZVOL) 1870 error = SET_ERROR(EINVAL); 1871 } 1872 1873 if (error) { 1874 bioerror(bp, error); 1875 biodone(bp); 1876 return; 1877 } 1878 1879 zv = zs->zss_data; 1880 1881 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1882 bioerror(bp, EROFS); 1883 biodone(bp); 1884 return; 1885 } 1886 off = (uint64_t)bp->b_blkno * DEV_BSIZE; 1887 #endif 1888 1889 volsize = zv->zv_volsize; 1890 1891 os = zv->zv_objset; 1892 ASSERT(os != NULL); 1893 1894 #ifdef illumos 1895 bp_mapin(bp); 1896 addr = bp->b_un.b_addr; 1897 resid = bp->b_bcount; 1898 1899 if (resid > 0 && (off < 0 || off >= volsize)) { 1900 bioerror(bp, EIO); 1901 biodone(bp); 1902 return (0); 1903 } 1904 1905 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED; 1906 sync = ((!(bp->b_flags & B_ASYNC) && 1907 !(zv->zv_flags & ZVOL_WCE)) || 1908 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1909 !doread && !is_dumpified; 1910 #endif /* illumos */ 1911 #ifdef __FreeBSD__ 1912 addr = bp->bio_data; 1913 resid = bp->bio_length; 1914 1915 if (resid > 0 && (off < 0 || off >= volsize)) { 1916 error = SET_ERROR(EIO); 1917 goto out; 1918 } 1919 1920 is_dumpified = B_FALSE; 1921 sync = !doread && !is_dumpified && 1922 zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS; 1923 #endif /* __FreeBSD__ */ 1924 #ifdef __NetBSD__ 1925 addr = bp->b_data; 1926 resid = bp->b_bcount; 1927 1928 if (resid > 0 && off >= volsize) { 1929 bioerror(bp, EIO); 1930 biodone(bp); 1931 return; 1932 } 1933 1934 is_dumpified = B_FALSE; 1935 sync = ((!(bp->b_flags & B_ASYNC) && 1936 !(zv->zv_flags & ZVOL_WCE)) || 1937 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1938 !doread && !is_dumpified; 1939 1940 mutex_enter(&zv->zv_dklock); 1941 disk_busy(&zv->zv_dk); 1942 mutex_exit(&zv->zv_dklock); 1943 #endif 1944 1945 /* 1946 * There must be no buffer changes when doing a dmu_sync() because 1947 * we can't change the data whilst calculating the checksum. 1948 */ 1949 rl = zfs_range_lock(&zv->zv_znode, off, resid, 1950 doread ? RL_READER : RL_WRITER); 1951 1952 #ifdef __FreeBSD__ 1953 if (bp->bio_cmd == BIO_DELETE) { 1954 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1955 error = dmu_tx_assign(tx, TXG_WAIT); 1956 if (error != 0) { 1957 dmu_tx_abort(tx); 1958 } else { 1959 zvol_log_truncate(zv, tx, off, resid, sync); 1960 dmu_tx_commit(tx); 1961 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 1962 off, resid); 1963 resid = 0; 1964 } 1965 goto unlock; 1966 } 1967 #endif 1968 while (resid != 0 && off < volsize) { 1969 size_t size = MIN(resid, zvol_maxphys); 1970 if (is_dumpified) { 1971 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1972 error = zvol_dumpio(zv, addr, off, size, 1973 doread, B_FALSE); 1974 } else if (doread) { 1975 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1976 DMU_READ_PREFETCH); 1977 } else { 1978 dmu_tx_t *tx = dmu_tx_create(os); 1979 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1980 error = dmu_tx_assign(tx, TXG_WAIT); 1981 if (error) { 1982 dmu_tx_abort(tx); 1983 } else { 1984 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1985 zvol_log_write(zv, tx, off, size, sync); 1986 dmu_tx_commit(tx); 1987 } 1988 } 1989 if (error) { 1990 /* convert checksum errors into IO errors */ 1991 if (error == ECKSUM) 1992 error = SET_ERROR(EIO); 1993 break; 1994 } 1995 off += size; 1996 addr += size; 1997 resid -= size; 1998 } 1999 #ifdef __FreeBSD__ 2000 unlock: 2001 #endif 2002 zfs_range_unlock(rl); 2003 2004 #ifdef illumos 2005 if ((bp->b_resid = resid) == bp->b_bcount) 2006 bioerror(bp, off > volsize ? EINVAL : error); 2007 2008 if (sync) 2009 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2010 biodone(bp); 2011 2012 return (0); 2013 #endif /* illumos */ 2014 #ifdef __FreeBSD__ 2015 bp->bio_completed = bp->bio_length - resid; 2016 if (bp->bio_completed < bp->bio_length && off > volsize) 2017 error = EINVAL; 2018 2019 if (sync) { 2020 sync: 2021 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2022 } 2023 out: 2024 if (bp->bio_to) 2025 g_io_deliver(bp, error); 2026 else 2027 biofinish(bp, NULL, error); 2028 #endif /* __FreeBSD__ */ 2029 #ifdef __NetBSD__ 2030 if ((bp->b_resid = resid) == bp->b_bcount) 2031 bioerror(bp, off > volsize ? EINVAL : error); 2032 2033 if (sync) 2034 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2035 mutex_enter(&zv->zv_dklock); 2036 disk_unbusy(&zv->zv_dk, bp->b_bcount - bp->b_resid, doread); 2037 mutex_exit(&zv->zv_dklock); 2038 biodone(bp); 2039 #endif /* __NetBSD__ */ 2040 } 2041 2042 #if defined(illumos) || defined(__NetBSD__) 2043 /* 2044 * Set the buffer count to the zvol maximum transfer. 2045 * Using our own routine instead of the default minphys() 2046 * means that for larger writes we write bigger buffers on X86 2047 * (128K instead of 56K) and flush the disk write cache less often 2048 * (every zvol_maxphys - currently 1MB) instead of minphys (currently 2049 * 56K on X86 and 128K on sparc). 2050 */ 2051 void 2052 zvol_minphys(struct buf *bp) 2053 { 2054 if (bp->b_bcount > zvol_maxphys) 2055 bp->b_bcount = zvol_maxphys; 2056 } 2057 #endif 2058 2059 #ifdef illumos 2060 int 2061 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 2062 { 2063 minor_t minor = getminor(dev); 2064 zvol_state_t *zv; 2065 int error = 0; 2066 uint64_t size; 2067 uint64_t boff; 2068 uint64_t resid; 2069 2070 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2071 if (zv == NULL) 2072 return (SET_ERROR(ENXIO)); 2073 2074 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0) 2075 return (SET_ERROR(EINVAL)); 2076 2077 boff = ldbtob(blkno); 2078 resid = ldbtob(nblocks); 2079 2080 VERIFY3U(boff + resid, <=, zv->zv_volsize); 2081 2082 while (resid) { 2083 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 2084 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 2085 if (error) 2086 break; 2087 boff += size; 2088 addr += size; 2089 resid -= size; 2090 } 2091 2092 return (error); 2093 } 2094 #endif 2095 2096 /*ARGSUSED*/ 2097 #if defined(illumos) || defined(__NetBSD__) 2098 int 2099 zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 2100 #endif 2101 #ifdef __FreeBSD__ 2102 int 2103 zvol_read(struct cdev *dev, struct uio *uio, int ioflag) 2104 #endif 2105 { 2106 zvol_state_t *zv; 2107 uint64_t volsize; 2108 rl_t *rl; 2109 int error = 0; 2110 2111 #if defined(illumos) || defined(__NetBSD__) 2112 minor_t minor = getminor(dev); 2113 2114 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2115 if (zv == NULL) 2116 return (SET_ERROR(ENXIO)); 2117 #else 2118 zv = dev->si_drv2; 2119 #endif 2120 2121 volsize = zv->zv_volsize; 2122 /* uio_loffset == volsize isn't an error as its required for EOF processing. */ 2123 if (uio->uio_resid > 0 && 2124 (uio->uio_loffset < 0 || uio->uio_loffset > volsize)) 2125 return (SET_ERROR(EIO)); 2126 2127 #ifdef illumos 2128 if (zv->zv_flags & ZVOL_DUMPIFIED) { 2129 error = physio(zvol_strategy, NULL, dev, B_READ, 2130 zvol_minphys, uio); 2131 return (error); 2132 } 2133 #endif 2134 2135 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 2136 RL_READER); 2137 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 2138 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 2139 2140 /* don't read past the end */ 2141 if (bytes > volsize - uio->uio_loffset) 2142 bytes = volsize - uio->uio_loffset; 2143 2144 error = dmu_read_uio_dbuf(zv->zv_dbuf, uio, bytes); 2145 if (error) { 2146 /* convert checksum errors into IO errors */ 2147 if (error == ECKSUM) 2148 error = SET_ERROR(EIO); 2149 break; 2150 } 2151 } 2152 zfs_range_unlock(rl); 2153 return (error); 2154 } 2155 2156 /*ARGSUSED*/ 2157 #if defined(illumos) || defined(__NetBSD__) 2158 int 2159 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 2160 #else 2161 int 2162 zvol_write(struct cdev *dev, struct uio *uio, int ioflag) 2163 #endif 2164 { 2165 zvol_state_t *zv; 2166 uint64_t volsize; 2167 rl_t *rl; 2168 int error = 0; 2169 boolean_t sync; 2170 2171 #if defined(illumos) || defined(__NetBSD__) 2172 minor_t minor = getminor(dev); 2173 2174 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2175 if (zv == NULL) 2176 return (SET_ERROR(ENXIO)); 2177 #else 2178 zv = dev->si_drv2; 2179 #endif 2180 2181 volsize = zv->zv_volsize; 2182 /* uio_loffset == volsize isn't an error as its required for EOF processing. */ 2183 if (uio->uio_resid > 0 && 2184 (uio->uio_loffset < 0 || uio->uio_loffset > volsize)) 2185 return (SET_ERROR(EIO)); 2186 2187 #ifdef illumos 2188 if (zv->zv_flags & ZVOL_DUMPIFIED) { 2189 error = physio(zvol_strategy, NULL, dev, B_WRITE, 2190 zvol_minphys, uio); 2191 return (error); 2192 } 2193 2194 sync = !(zv->zv_flags & ZVOL_WCE) || 2195 #endif 2196 #ifdef __FreeBSD__ 2197 sync = (ioflag & IO_SYNC) || 2198 #endif 2199 #ifdef __NetBSD__ 2200 sync = 1 || 2201 #endif 2202 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 2203 2204 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 2205 RL_WRITER); 2206 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 2207 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 2208 uint64_t off = uio->uio_loffset; 2209 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 2210 2211 if (bytes > volsize - off) /* don't write past the end */ 2212 bytes = volsize - off; 2213 2214 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 2215 error = dmu_tx_assign(tx, TXG_WAIT); 2216 if (error) { 2217 dmu_tx_abort(tx); 2218 break; 2219 } 2220 error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx); 2221 if (error == 0) 2222 zvol_log_write(zv, tx, off, bytes, sync); 2223 dmu_tx_commit(tx); 2224 2225 if (error) 2226 break; 2227 } 2228 zfs_range_unlock(rl); 2229 if (sync) 2230 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2231 return (error); 2232 } 2233 2234 #ifdef illumos 2235 int 2236 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 2237 { 2238 struct uuid uuid = EFI_RESERVED; 2239 efi_gpe_t gpe = { 0 }; 2240 uint32_t crc; 2241 dk_efi_t efi; 2242 int length; 2243 char *ptr; 2244 2245 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 2246 return (SET_ERROR(EFAULT)); 2247 ptr = (char *)(uintptr_t)efi.dki_data_64; 2248 length = efi.dki_length; 2249 /* 2250 * Some clients may attempt to request a PMBR for the 2251 * zvol. Currently this interface will return EINVAL to 2252 * such requests. These requests could be supported by 2253 * adding a check for lba == 0 and consing up an appropriate 2254 * PMBR. 2255 */ 2256 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 2257 return (SET_ERROR(EINVAL)); 2258 2259 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 2260 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 2261 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 2262 2263 if (efi.dki_lba == 1) { 2264 efi_gpt_t gpt = { 0 }; 2265 2266 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 2267 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 2268 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 2269 gpt.efi_gpt_MyLBA = LE_64(1ULL); 2270 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 2271 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 2272 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 2273 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 2274 gpt.efi_gpt_SizeOfPartitionEntry = 2275 LE_32(sizeof (efi_gpe_t)); 2276 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 2277 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 2278 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 2279 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 2280 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 2281 flag)) 2282 return (SET_ERROR(EFAULT)); 2283 ptr += sizeof (gpt); 2284 length -= sizeof (gpt); 2285 } 2286 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 2287 length), flag)) 2288 return (SET_ERROR(EFAULT)); 2289 return (0); 2290 } 2291 2292 /* 2293 * BEGIN entry points to allow external callers access to the volume. 2294 */ 2295 /* 2296 * Return the volume parameters needed for access from an external caller. 2297 * These values are invariant as long as the volume is held open. 2298 */ 2299 int 2300 zvol_get_volume_params(minor_t minor, uint64_t *blksize, 2301 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 2302 void **rl_hdl, void **bonus_hdl) 2303 { 2304 zvol_state_t *zv; 2305 2306 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2307 if (zv == NULL) 2308 return (SET_ERROR(ENXIO)); 2309 if (zv->zv_flags & ZVOL_DUMPIFIED) 2310 return (SET_ERROR(ENXIO)); 2311 2312 ASSERT(blksize && max_xfer_len && minor_hdl && 2313 objset_hdl && zil_hdl && rl_hdl && bonus_hdl); 2314 2315 *blksize = zv->zv_volblocksize; 2316 *max_xfer_len = (uint64_t)zvol_maxphys; 2317 *minor_hdl = zv; 2318 *objset_hdl = zv->zv_objset; 2319 *zil_hdl = zv->zv_zilog; 2320 *rl_hdl = &zv->zv_znode; 2321 *bonus_hdl = zv->zv_dbuf; 2322 return (0); 2323 } 2324 2325 /* 2326 * Return the current volume size to an external caller. 2327 * The size can change while the volume is open. 2328 */ 2329 uint64_t 2330 zvol_get_volume_size(void *minor_hdl) 2331 { 2332 zvol_state_t *zv = minor_hdl; 2333 2334 return (zv->zv_volsize); 2335 } 2336 2337 /* 2338 * Return the current WCE setting to an external caller. 2339 * The WCE setting can change while the volume is open. 2340 */ 2341 int 2342 zvol_get_volume_wce(void *minor_hdl) 2343 { 2344 zvol_state_t *zv = minor_hdl; 2345 2346 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 2347 } 2348 2349 /* 2350 * Entry point for external callers to zvol_log_write 2351 */ 2352 void 2353 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 2354 boolean_t sync) 2355 { 2356 zvol_state_t *zv = minor_hdl; 2357 2358 zvol_log_write(zv, tx, off, resid, sync); 2359 } 2360 /* 2361 * END entry points to allow external callers access to the volume. 2362 */ 2363 #endif /* illumos */ 2364 2365 /* 2366 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 2367 */ 2368 static void 2369 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 2370 boolean_t sync) 2371 { 2372 itx_t *itx; 2373 lr_truncate_t *lr; 2374 zilog_t *zilog = zv->zv_zilog; 2375 2376 if (zil_replaying(zilog, tx)) 2377 return; 2378 2379 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 2380 lr = (lr_truncate_t *)&itx->itx_lr; 2381 lr->lr_foid = ZVOL_OBJ; 2382 lr->lr_offset = off; 2383 lr->lr_length = len; 2384 2385 itx->itx_sync = (sync || zv->zv_sync_cnt != 0); 2386 zil_itx_assign(zilog, itx, tx); 2387 } 2388 2389 #ifdef illumos 2390 /* 2391 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 2392 * Also a dirtbag dkio ioctl for unmap/free-block functionality. 2393 */ 2394 /*ARGSUSED*/ 2395 int 2396 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 2397 { 2398 zvol_state_t *zv; 2399 struct dk_callback *dkc; 2400 int error = 0; 2401 rl_t *rl; 2402 2403 mutex_enter(&zfsdev_state_lock); 2404 2405 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 2406 2407 if (zv == NULL) { 2408 mutex_exit(&zfsdev_state_lock); 2409 return (SET_ERROR(ENXIO)); 2410 } 2411 ASSERT(zv->zv_total_opens > 0); 2412 2413 switch (cmd) { 2414 2415 case DKIOCINFO: 2416 { 2417 struct dk_cinfo dki; 2418 2419 bzero(&dki, sizeof (dki)); 2420 (void) strcpy(dki.dki_cname, "zvol"); 2421 (void) strcpy(dki.dki_dname, "zvol"); 2422 dki.dki_ctype = DKC_UNKNOWN; 2423 dki.dki_unit = getminor(dev); 2424 dki.dki_maxtransfer = 2425 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs); 2426 mutex_exit(&zfsdev_state_lock); 2427 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 2428 error = SET_ERROR(EFAULT); 2429 return (error); 2430 } 2431 2432 case DKIOCGMEDIAINFO: 2433 { 2434 struct dk_minfo dkm; 2435 2436 bzero(&dkm, sizeof (dkm)); 2437 dkm.dki_lbsize = 1U << zv->zv_min_bs; 2438 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 2439 dkm.dki_media_type = DK_UNKNOWN; 2440 mutex_exit(&zfsdev_state_lock); 2441 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 2442 error = SET_ERROR(EFAULT); 2443 return (error); 2444 } 2445 2446 case DKIOCGMEDIAINFOEXT: 2447 { 2448 struct dk_minfo_ext dkmext; 2449 2450 bzero(&dkmext, sizeof (dkmext)); 2451 dkmext.dki_lbsize = 1U << zv->zv_min_bs; 2452 dkmext.dki_pbsize = zv->zv_volblocksize; 2453 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 2454 dkmext.dki_media_type = DK_UNKNOWN; 2455 mutex_exit(&zfsdev_state_lock); 2456 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag)) 2457 error = SET_ERROR(EFAULT); 2458 return (error); 2459 } 2460 2461 case DKIOCGETEFI: 2462 { 2463 uint64_t vs = zv->zv_volsize; 2464 uint8_t bs = zv->zv_min_bs; 2465 2466 mutex_exit(&zfsdev_state_lock); 2467 error = zvol_getefi((void *)arg, flag, vs, bs); 2468 return (error); 2469 } 2470 2471 case DKIOCFLUSHWRITECACHE: 2472 dkc = (struct dk_callback *)arg; 2473 mutex_exit(&zfsdev_state_lock); 2474 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2475 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 2476 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 2477 error = 0; 2478 } 2479 return (error); 2480 2481 case DKIOCGETWCE: 2482 { 2483 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 2484 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 2485 flag)) 2486 error = SET_ERROR(EFAULT); 2487 break; 2488 } 2489 case DKIOCSETWCE: 2490 { 2491 int wce; 2492 if (ddi_copyin((void *)arg, &wce, sizeof (int), 2493 flag)) { 2494 error = SET_ERROR(EFAULT); 2495 break; 2496 } 2497 if (wce) { 2498 zv->zv_flags |= ZVOL_WCE; 2499 mutex_exit(&zfsdev_state_lock); 2500 } else { 2501 zv->zv_flags &= ~ZVOL_WCE; 2502 mutex_exit(&zfsdev_state_lock); 2503 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2504 } 2505 return (0); 2506 } 2507 2508 case DKIOCGGEOM: 2509 case DKIOCGVTOC: 2510 /* 2511 * commands using these (like prtvtoc) expect ENOTSUP 2512 * since we're emulating an EFI label 2513 */ 2514 error = SET_ERROR(ENOTSUP); 2515 break; 2516 2517 case DKIOCDUMPINIT: 2518 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 2519 RL_WRITER); 2520 error = zvol_dumpify(zv); 2521 zfs_range_unlock(rl); 2522 break; 2523 2524 case DKIOCDUMPFINI: 2525 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 2526 break; 2527 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 2528 RL_WRITER); 2529 error = zvol_dump_fini(zv); 2530 zfs_range_unlock(rl); 2531 break; 2532 2533 case DKIOCFREE: 2534 { 2535 dkioc_free_t df; 2536 dmu_tx_t *tx; 2537 2538 if (!zvol_unmap_enabled) 2539 break; 2540 2541 if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) { 2542 error = SET_ERROR(EFAULT); 2543 break; 2544 } 2545 2546 /* 2547 * Apply Postel's Law to length-checking. If they overshoot, 2548 * just blank out until the end, if there's a need to blank 2549 * out anything. 2550 */ 2551 if (df.df_start >= zv->zv_volsize) 2552 break; /* No need to do anything... */ 2553 2554 mutex_exit(&zfsdev_state_lock); 2555 2556 rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length, 2557 RL_WRITER); 2558 tx = dmu_tx_create(zv->zv_objset); 2559 dmu_tx_mark_netfree(tx); 2560 error = dmu_tx_assign(tx, TXG_WAIT); 2561 if (error != 0) { 2562 dmu_tx_abort(tx); 2563 } else { 2564 zvol_log_truncate(zv, tx, df.df_start, 2565 df.df_length, B_TRUE); 2566 dmu_tx_commit(tx); 2567 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 2568 df.df_start, df.df_length); 2569 } 2570 2571 zfs_range_unlock(rl); 2572 2573 /* 2574 * If the write-cache is disabled, 'sync' property 2575 * is set to 'always', or if the caller is asking for 2576 * a synchronous free, commit this operation to the zil. 2577 * This will sync any previous uncommitted writes to the 2578 * zvol object. 2579 * Can be overridden by the zvol_unmap_sync_enabled tunable. 2580 */ 2581 if ((error == 0) && zvol_unmap_sync_enabled && 2582 (!(zv->zv_flags & ZVOL_WCE) || 2583 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) || 2584 (df.df_flags & DF_WAIT_SYNC))) { 2585 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2586 } 2587 2588 return (error); 2589 } 2590 2591 default: 2592 error = SET_ERROR(ENOTTY); 2593 break; 2594 2595 } 2596 mutex_exit(&zfsdev_state_lock); 2597 return (error); 2598 } 2599 #endif /* illumos */ 2600 2601 int 2602 zvol_busy(void) 2603 { 2604 return (zvol_minors != 0); 2605 } 2606 2607 void 2608 zvol_init(void) 2609 { 2610 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 2611 1) == 0); 2612 #ifndef __FreeBSD__ 2613 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 2614 #endif 2615 ZFS_LOG(1, "ZVOL Initialized."); 2616 } 2617 2618 void 2619 zvol_fini(void) 2620 { 2621 #ifndef __FreeBSD__ 2622 mutex_destroy(&zfsdev_state_lock); 2623 #endif 2624 ddi_soft_state_fini(&zfsdev_state); 2625 ZFS_LOG(1, "ZVOL Deinitialized."); 2626 } 2627 2628 #ifdef illumos 2629 /*ARGSUSED*/ 2630 static int 2631 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx) 2632 { 2633 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 2634 2635 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 2636 return (1); 2637 return (0); 2638 } 2639 2640 /*ARGSUSED*/ 2641 static void 2642 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx) 2643 { 2644 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 2645 2646 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx); 2647 } 2648 2649 static int 2650 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 2651 { 2652 dmu_tx_t *tx; 2653 int error; 2654 objset_t *os = zv->zv_objset; 2655 spa_t *spa = dmu_objset_spa(os); 2656 vdev_t *vd = spa->spa_root_vdev; 2657 nvlist_t *nv = NULL; 2658 uint64_t version = spa_version(spa); 2659 uint64_t checksum, compress, refresrv, vbs, dedup; 2660 2661 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 2662 ASSERT(vd->vdev_ops == &vdev_root_ops); 2663 2664 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 2665 DMU_OBJECT_END); 2666 if (error != 0) 2667 return (error); 2668 /* wait for dmu_free_long_range to actually free the blocks */ 2669 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2670 2671 /* 2672 * If the pool on which the dump device is being initialized has more 2673 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is 2674 * enabled. If so, bump that feature's counter to indicate that the 2675 * feature is active. We also check the vdev type to handle the 2676 * following case: 2677 * # zpool create test raidz disk1 disk2 disk3 2678 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev), 2679 * the raidz vdev itself has 3 children. 2680 */ 2681 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) { 2682 if (!spa_feature_is_enabled(spa, 2683 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 2684 return (SET_ERROR(ENOTSUP)); 2685 (void) dsl_sync_task(spa_name(spa), 2686 zfs_mvdev_dump_feature_check, 2687 zfs_mvdev_dump_activate_feature_sync, NULL, 2688 2, ZFS_SPACE_CHECK_RESERVED); 2689 } 2690 2691 if (!resize) { 2692 error = dsl_prop_get_integer(zv->zv_name, 2693 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 2694 if (error == 0) { 2695 error = dsl_prop_get_integer(zv->zv_name, 2696 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, 2697 NULL); 2698 } 2699 if (error == 0) { 2700 error = dsl_prop_get_integer(zv->zv_name, 2701 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2702 &refresrv, NULL); 2703 } 2704 if (error == 0) { 2705 error = dsl_prop_get_integer(zv->zv_name, 2706 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, 2707 NULL); 2708 } 2709 if (version >= SPA_VERSION_DEDUP && error == 0) { 2710 error = dsl_prop_get_integer(zv->zv_name, 2711 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 2712 } 2713 } 2714 if (error != 0) 2715 return (error); 2716 2717 tx = dmu_tx_create(os); 2718 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2719 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2720 error = dmu_tx_assign(tx, TXG_WAIT); 2721 if (error != 0) { 2722 dmu_tx_abort(tx); 2723 return (error); 2724 } 2725 2726 /* 2727 * If we are resizing the dump device then we only need to 2728 * update the refreservation to match the newly updated 2729 * zvolsize. Otherwise, we save off the original state of the 2730 * zvol so that we can restore them if the zvol is ever undumpified. 2731 */ 2732 if (resize) { 2733 error = zap_update(os, ZVOL_ZAP_OBJ, 2734 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2735 &zv->zv_volsize, tx); 2736 } else { 2737 error = zap_update(os, ZVOL_ZAP_OBJ, 2738 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 2739 &compress, tx); 2740 if (error == 0) { 2741 error = zap_update(os, ZVOL_ZAP_OBJ, 2742 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, 2743 &checksum, tx); 2744 } 2745 if (error == 0) { 2746 error = zap_update(os, ZVOL_ZAP_OBJ, 2747 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2748 &refresrv, tx); 2749 } 2750 if (error == 0) { 2751 error = zap_update(os, ZVOL_ZAP_OBJ, 2752 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 2753 &vbs, tx); 2754 } 2755 if (error == 0) { 2756 error = dmu_object_set_blocksize( 2757 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx); 2758 } 2759 if (version >= SPA_VERSION_DEDUP && error == 0) { 2760 error = zap_update(os, ZVOL_ZAP_OBJ, 2761 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 2762 &dedup, tx); 2763 } 2764 if (error == 0) 2765 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE; 2766 } 2767 dmu_tx_commit(tx); 2768 2769 /* 2770 * We only need update the zvol's property if we are initializing 2771 * the dump area for the first time. 2772 */ 2773 if (error == 0 && !resize) { 2774 /* 2775 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum 2776 * function. Otherwise, use the old default -- OFF. 2777 */ 2778 checksum = spa_feature_is_active(spa, 2779 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY : 2780 ZIO_CHECKSUM_OFF; 2781 2782 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2783 VERIFY(nvlist_add_uint64(nv, 2784 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 2785 VERIFY(nvlist_add_uint64(nv, 2786 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 2787 ZIO_COMPRESS_OFF) == 0); 2788 VERIFY(nvlist_add_uint64(nv, 2789 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 2790 checksum) == 0); 2791 if (version >= SPA_VERSION_DEDUP) { 2792 VERIFY(nvlist_add_uint64(nv, 2793 zfs_prop_to_name(ZFS_PROP_DEDUP), 2794 ZIO_CHECKSUM_OFF) == 0); 2795 } 2796 2797 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2798 nv, NULL); 2799 nvlist_free(nv); 2800 } 2801 2802 /* Allocate the space for the dump */ 2803 if (error == 0) 2804 error = zvol_prealloc(zv); 2805 return (error); 2806 } 2807 2808 static int 2809 zvol_dumpify(zvol_state_t *zv) 2810 { 2811 int error = 0; 2812 uint64_t dumpsize = 0; 2813 dmu_tx_t *tx; 2814 objset_t *os = zv->zv_objset; 2815 2816 if (zv->zv_flags & ZVOL_RDONLY) 2817 return (SET_ERROR(EROFS)); 2818 2819 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 2820 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 2821 boolean_t resize = (dumpsize > 0); 2822 2823 if ((error = zvol_dump_init(zv, resize)) != 0) { 2824 (void) zvol_dump_fini(zv); 2825 return (error); 2826 } 2827 } 2828 2829 /* 2830 * Build up our lba mapping. 2831 */ 2832 error = zvol_get_lbas(zv); 2833 if (error) { 2834 (void) zvol_dump_fini(zv); 2835 return (error); 2836 } 2837 2838 tx = dmu_tx_create(os); 2839 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2840 error = dmu_tx_assign(tx, TXG_WAIT); 2841 if (error) { 2842 dmu_tx_abort(tx); 2843 (void) zvol_dump_fini(zv); 2844 return (error); 2845 } 2846 2847 zv->zv_flags |= ZVOL_DUMPIFIED; 2848 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 2849 &zv->zv_volsize, tx); 2850 dmu_tx_commit(tx); 2851 2852 if (error) { 2853 (void) zvol_dump_fini(zv); 2854 return (error); 2855 } 2856 2857 txg_wait_synced(dmu_objset_pool(os), 0); 2858 return (0); 2859 } 2860 2861 static int 2862 zvol_dump_fini(zvol_state_t *zv) 2863 { 2864 dmu_tx_t *tx; 2865 objset_t *os = zv->zv_objset; 2866 nvlist_t *nv; 2867 int error = 0; 2868 uint64_t checksum, compress, refresrv, vbs, dedup; 2869 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 2870 2871 /* 2872 * Attempt to restore the zvol back to its pre-dumpified state. 2873 * This is a best-effort attempt as it's possible that not all 2874 * of these properties were initialized during the dumpify process 2875 * (i.e. error during zvol_dump_init). 2876 */ 2877 2878 tx = dmu_tx_create(os); 2879 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2880 error = dmu_tx_assign(tx, TXG_WAIT); 2881 if (error) { 2882 dmu_tx_abort(tx); 2883 return (error); 2884 } 2885 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 2886 dmu_tx_commit(tx); 2887 2888 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2889 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 2890 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2891 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 2892 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2893 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 2894 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2895 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 2896 2897 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2898 (void) nvlist_add_uint64(nv, 2899 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 2900 (void) nvlist_add_uint64(nv, 2901 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 2902 (void) nvlist_add_uint64(nv, 2903 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 2904 if (version >= SPA_VERSION_DEDUP && 2905 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2906 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 2907 (void) nvlist_add_uint64(nv, 2908 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 2909 } 2910 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2911 nv, NULL); 2912 nvlist_free(nv); 2913 2914 zvol_free_extents(zv); 2915 zv->zv_flags &= ~ZVOL_DUMPIFIED; 2916 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2917 /* wait for dmu_free_long_range to actually free the blocks */ 2918 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2919 tx = dmu_tx_create(os); 2920 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2921 error = dmu_tx_assign(tx, TXG_WAIT); 2922 if (error) { 2923 dmu_tx_abort(tx); 2924 return (error); 2925 } 2926 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2927 zv->zv_volblocksize = vbs; 2928 dmu_tx_commit(tx); 2929 2930 return (0); 2931 } 2932 #endif /* illumos */ 2933 2934 #ifdef __FreeBSD__ 2935 static void 2936 zvol_geom_run(zvol_state_t *zv) 2937 { 2938 struct g_provider *pp; 2939 2940 pp = zv->zv_provider; 2941 g_error_provider(pp, 0); 2942 2943 kproc_kthread_add(zvol_geom_worker, zv, &zfsproc, NULL, 0, 0, 2944 "zfskern", "zvol %s", pp->name + sizeof(ZVOL_DRIVER)); 2945 } 2946 2947 static void 2948 zvol_geom_destroy(zvol_state_t *zv) 2949 { 2950 struct g_provider *pp; 2951 2952 g_topology_assert(); 2953 2954 mtx_lock(&zv->zv_queue_mtx); 2955 zv->zv_state = 1; 2956 wakeup_one(&zv->zv_queue); 2957 while (zv->zv_state != 2) 2958 msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0); 2959 mtx_destroy(&zv->zv_queue_mtx); 2960 2961 pp = zv->zv_provider; 2962 zv->zv_provider = NULL; 2963 pp->private = NULL; 2964 g_wither_geom(pp->geom, ENXIO); 2965 } 2966 2967 static int 2968 zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace) 2969 { 2970 int count, error, flags; 2971 2972 g_topology_assert(); 2973 2974 /* 2975 * To make it easier we expect either open or close, but not both 2976 * at the same time. 2977 */ 2978 KASSERT((acr >= 0 && acw >= 0 && ace >= 0) || 2979 (acr <= 0 && acw <= 0 && ace <= 0), 2980 ("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).", 2981 pp->name, acr, acw, ace)); 2982 2983 if (pp->private == NULL) { 2984 if (acr <= 0 && acw <= 0 && ace <= 0) 2985 return (0); 2986 return (pp->error); 2987 } 2988 2989 /* 2990 * We don't pass FEXCL flag to zvol_open()/zvol_close() if ace != 0, 2991 * because GEOM already handles that and handles it a bit differently. 2992 * GEOM allows for multiple read/exclusive consumers and ZFS allows 2993 * only one exclusive consumer, no matter if it is reader or writer. 2994 * I like better the way GEOM works so I'll leave it for GEOM to 2995 * decide what to do. 2996 */ 2997 2998 count = acr + acw + ace; 2999 if (count == 0) 3000 return (0); 3001 3002 flags = 0; 3003 if (acr != 0 || ace != 0) 3004 flags |= FREAD; 3005 if (acw != 0) 3006 flags |= FWRITE; 3007 3008 g_topology_unlock(); 3009 if (count > 0) 3010 error = zvol_open(pp, flags, count); 3011 else 3012 error = zvol_close(pp, flags, -count); 3013 g_topology_lock(); 3014 return (error); 3015 } 3016 3017 static void 3018 zvol_geom_start(struct bio *bp) 3019 { 3020 zvol_state_t *zv; 3021 boolean_t first; 3022 3023 zv = bp->bio_to->private; 3024 ASSERT(zv != NULL); 3025 switch (bp->bio_cmd) { 3026 case BIO_FLUSH: 3027 if (!THREAD_CAN_SLEEP()) 3028 goto enqueue; 3029 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3030 g_io_deliver(bp, 0); 3031 break; 3032 case BIO_READ: 3033 case BIO_WRITE: 3034 case BIO_DELETE: 3035 if (!THREAD_CAN_SLEEP()) 3036 goto enqueue; 3037 zvol_strategy(bp); 3038 break; 3039 case BIO_GETATTR: { 3040 spa_t *spa = dmu_objset_spa(zv->zv_objset); 3041 uint64_t refd, avail, usedobjs, availobjs, val; 3042 3043 if (g_handleattr_int(bp, "GEOM::candelete", 1)) 3044 return; 3045 if (strcmp(bp->bio_attribute, "blocksavail") == 0) { 3046 dmu_objset_space(zv->zv_objset, &refd, &avail, 3047 &usedobjs, &availobjs); 3048 if (g_handleattr_off_t(bp, "blocksavail", 3049 avail / DEV_BSIZE)) 3050 return; 3051 } else if (strcmp(bp->bio_attribute, "blocksused") == 0) { 3052 dmu_objset_space(zv->zv_objset, &refd, &avail, 3053 &usedobjs, &availobjs); 3054 if (g_handleattr_off_t(bp, "blocksused", 3055 refd / DEV_BSIZE)) 3056 return; 3057 } else if (strcmp(bp->bio_attribute, "poolblocksavail") == 0) { 3058 avail = metaslab_class_get_space(spa_normal_class(spa)); 3059 avail -= metaslab_class_get_alloc(spa_normal_class(spa)); 3060 if (g_handleattr_off_t(bp, "poolblocksavail", 3061 avail / DEV_BSIZE)) 3062 return; 3063 } else if (strcmp(bp->bio_attribute, "poolblocksused") == 0) { 3064 refd = metaslab_class_get_alloc(spa_normal_class(spa)); 3065 if (g_handleattr_off_t(bp, "poolblocksused", 3066 refd / DEV_BSIZE)) 3067 return; 3068 } 3069 /* FALLTHROUGH */ 3070 } 3071 default: 3072 g_io_deliver(bp, EOPNOTSUPP); 3073 break; 3074 } 3075 return; 3076 3077 enqueue: 3078 mtx_lock(&zv->zv_queue_mtx); 3079 first = (bioq_first(&zv->zv_queue) == NULL); 3080 bioq_insert_tail(&zv->zv_queue, bp); 3081 mtx_unlock(&zv->zv_queue_mtx); 3082 if (first) 3083 wakeup_one(&zv->zv_queue); 3084 } 3085 3086 static void 3087 zvol_geom_worker(void *arg) 3088 { 3089 zvol_state_t *zv; 3090 struct bio *bp; 3091 3092 thread_lock(curthread); 3093 sched_prio(curthread, PRIBIO); 3094 thread_unlock(curthread); 3095 3096 zv = arg; 3097 for (;;) { 3098 mtx_lock(&zv->zv_queue_mtx); 3099 bp = bioq_takefirst(&zv->zv_queue); 3100 if (bp == NULL) { 3101 if (zv->zv_state == 1) { 3102 zv->zv_state = 2; 3103 wakeup(&zv->zv_state); 3104 mtx_unlock(&zv->zv_queue_mtx); 3105 kthread_exit(); 3106 } 3107 msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP, 3108 "zvol:io", 0); 3109 continue; 3110 } 3111 mtx_unlock(&zv->zv_queue_mtx); 3112 switch (bp->bio_cmd) { 3113 case BIO_FLUSH: 3114 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3115 g_io_deliver(bp, 0); 3116 break; 3117 case BIO_READ: 3118 case BIO_WRITE: 3119 case BIO_DELETE: 3120 zvol_strategy(bp); 3121 break; 3122 default: 3123 g_io_deliver(bp, EOPNOTSUPP); 3124 break; 3125 } 3126 } 3127 } 3128 3129 extern boolean_t dataset_name_hidden(const char *name); 3130 3131 static int 3132 zvol_create_snapshots(objset_t *os, const char *name) 3133 { 3134 uint64_t cookie, obj; 3135 char *sname; 3136 int error, len; 3137 3138 cookie = obj = 0; 3139 sname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 3140 3141 #if 0 3142 (void) dmu_objset_find(name, dmu_objset_prefetch, NULL, 3143 DS_FIND_SNAPSHOTS); 3144 #endif 3145 3146 for (;;) { 3147 len = snprintf(sname, MAXPATHLEN, "%s@", name); 3148 if (len >= MAXPATHLEN) { 3149 dmu_objset_rele(os, FTAG); 3150 error = ENAMETOOLONG; 3151 break; 3152 } 3153 3154 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 3155 error = dmu_snapshot_list_next(os, MAXPATHLEN - len, 3156 sname + len, &obj, &cookie, NULL); 3157 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 3158 if (error != 0) { 3159 if (error == ENOENT) 3160 error = 0; 3161 break; 3162 } 3163 3164 error = zvol_create_minor(sname); 3165 if (error != 0 && error != EEXIST) { 3166 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n", 3167 sname, error); 3168 break; 3169 } 3170 } 3171 3172 kmem_free(sname, MAXPATHLEN); 3173 return (error); 3174 } 3175 3176 int 3177 zvol_create_minors(const char *name) 3178 { 3179 uint64_t cookie; 3180 objset_t *os; 3181 char *osname, *p; 3182 int error, len; 3183 3184 if (dataset_name_hidden(name)) 3185 return (0); 3186 3187 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 3188 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n", 3189 name, error); 3190 return (error); 3191 } 3192 if (dmu_objset_type(os) == DMU_OST_ZVOL) { 3193 dsl_dataset_long_hold(os->os_dsl_dataset, FTAG); 3194 dsl_pool_rele(dmu_objset_pool(os), FTAG); 3195 error = zvol_create_minor(name); 3196 if (error == 0 || error == EEXIST) { 3197 error = zvol_create_snapshots(os, name); 3198 } else { 3199 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n", 3200 name, error); 3201 } 3202 dsl_dataset_long_rele(os->os_dsl_dataset, FTAG); 3203 dsl_dataset_rele(os->os_dsl_dataset, FTAG); 3204 return (error); 3205 } 3206 if (dmu_objset_type(os) != DMU_OST_ZFS) { 3207 dmu_objset_rele(os, FTAG); 3208 return (0); 3209 } 3210 3211 osname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 3212 if (snprintf(osname, MAXPATHLEN, "%s/", name) >= MAXPATHLEN) { 3213 dmu_objset_rele(os, FTAG); 3214 kmem_free(osname, MAXPATHLEN); 3215 return (ENOENT); 3216 } 3217 p = osname + strlen(osname); 3218 len = MAXPATHLEN - (p - osname); 3219 3220 #if 0 3221 /* Prefetch the datasets. */ 3222 cookie = 0; 3223 while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) { 3224 if (!dataset_name_hidden(osname)) 3225 (void) dmu_objset_prefetch(osname, NULL); 3226 } 3227 #endif 3228 3229 cookie = 0; 3230 while (dmu_dir_list_next(os, MAXPATHLEN - (p - osname), p, NULL, 3231 &cookie) == 0) { 3232 dmu_objset_rele(os, FTAG); 3233 (void)zvol_create_minors(osname); 3234 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 3235 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n", 3236 name, error); 3237 return (error); 3238 } 3239 } 3240 3241 dmu_objset_rele(os, FTAG); 3242 kmem_free(osname, MAXPATHLEN); 3243 return (0); 3244 } 3245 3246 static void 3247 zvol_rename_minor(zvol_state_t *zv, const char *newname) 3248 { 3249 struct g_geom *gp; 3250 struct g_provider *pp; 3251 struct cdev *dev; 3252 3253 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 3254 3255 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 3256 g_topology_lock(); 3257 pp = zv->zv_provider; 3258 ASSERT(pp != NULL); 3259 gp = pp->geom; 3260 ASSERT(gp != NULL); 3261 3262 zv->zv_provider = NULL; 3263 g_wither_provider(pp, ENXIO); 3264 3265 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname); 3266 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND; 3267 pp->sectorsize = DEV_BSIZE; 3268 pp->mediasize = zv->zv_volsize; 3269 pp->private = zv; 3270 zv->zv_provider = pp; 3271 g_error_provider(pp, 0); 3272 g_topology_unlock(); 3273 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) { 3274 struct make_dev_args args; 3275 3276 if ((dev = zv->zv_dev) != NULL) { 3277 zv->zv_dev = NULL; 3278 destroy_dev(dev); 3279 if (zv->zv_total_opens > 0) { 3280 zv->zv_flags &= ~ZVOL_EXCL; 3281 zv->zv_total_opens = 0; 3282 zvol_last_close(zv); 3283 } 3284 } 3285 3286 make_dev_args_init(&args); 3287 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 3288 args.mda_devsw = &zvol_cdevsw; 3289 args.mda_cr = NULL; 3290 args.mda_uid = UID_ROOT; 3291 args.mda_gid = GID_OPERATOR; 3292 args.mda_mode = 0640; 3293 args.mda_si_drv2 = zv; 3294 if (make_dev_s(&args, &zv->zv_dev, 3295 "%s/%s", ZVOL_DRIVER, newname) == 0) 3296 zv->zv_dev->si_iosize_max = MAXPHYS; 3297 } 3298 strlcpy(zv->zv_name, newname, sizeof(zv->zv_name)); 3299 } 3300 3301 void 3302 zvol_rename_minors(const char *oldname, const char *newname) 3303 { 3304 char name[MAXPATHLEN]; 3305 struct g_provider *pp; 3306 struct g_geom *gp; 3307 size_t oldnamelen, newnamelen; 3308 zvol_state_t *zv; 3309 char *namebuf; 3310 boolean_t locked = B_FALSE; 3311 3312 oldnamelen = strlen(oldname); 3313 newnamelen = strlen(newname); 3314 3315 DROP_GIANT(); 3316 /* See comment in zvol_open(). */ 3317 if (!MUTEX_HELD(&zfsdev_state_lock)) { 3318 mutex_enter(&zfsdev_state_lock); 3319 locked = B_TRUE; 3320 } 3321 3322 LIST_FOREACH(zv, &all_zvols, zv_links) { 3323 if (strcmp(zv->zv_name, oldname) == 0) { 3324 zvol_rename_minor(zv, newname); 3325 } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 && 3326 (zv->zv_name[oldnamelen] == '/' || 3327 zv->zv_name[oldnamelen] == '@')) { 3328 snprintf(name, sizeof(name), "%s%c%s", newname, 3329 zv->zv_name[oldnamelen], 3330 zv->zv_name + oldnamelen + 1); 3331 zvol_rename_minor(zv, name); 3332 } 3333 } 3334 3335 if (locked) 3336 mutex_exit(&zfsdev_state_lock); 3337 PICKUP_GIANT(); 3338 } 3339 3340 static int 3341 zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td) 3342 { 3343 zvol_state_t *zv = dev->si_drv2; 3344 int err = 0; 3345 3346 mutex_enter(&zfsdev_state_lock); 3347 if (zv->zv_total_opens == 0) 3348 err = zvol_first_open(zv); 3349 if (err) { 3350 mutex_exit(&zfsdev_state_lock); 3351 return (err); 3352 } 3353 if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 3354 err = SET_ERROR(EROFS); 3355 goto out; 3356 } 3357 if (zv->zv_flags & ZVOL_EXCL) { 3358 err = SET_ERROR(EBUSY); 3359 goto out; 3360 } 3361 #ifdef FEXCL 3362 if (flags & FEXCL) { 3363 if (zv->zv_total_opens != 0) { 3364 err = SET_ERROR(EBUSY); 3365 goto out; 3366 } 3367 zv->zv_flags |= ZVOL_EXCL; 3368 } 3369 #endif 3370 3371 zv->zv_total_opens++; 3372 if (flags & (FSYNC | FDSYNC)) { 3373 zv->zv_sync_cnt++; 3374 if (zv->zv_sync_cnt == 1) 3375 zil_async_to_sync(zv->zv_zilog, ZVOL_OBJ); 3376 } 3377 mutex_exit(&zfsdev_state_lock); 3378 return (err); 3379 out: 3380 if (zv->zv_total_opens == 0) 3381 zvol_last_close(zv); 3382 mutex_exit(&zfsdev_state_lock); 3383 return (err); 3384 } 3385 3386 static int 3387 zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td) 3388 { 3389 zvol_state_t *zv = dev->si_drv2; 3390 3391 mutex_enter(&zfsdev_state_lock); 3392 if (zv->zv_flags & ZVOL_EXCL) { 3393 ASSERT(zv->zv_total_opens == 1); 3394 zv->zv_flags &= ~ZVOL_EXCL; 3395 } 3396 3397 /* 3398 * If the open count is zero, this is a spurious close. 3399 * That indicates a bug in the kernel / DDI framework. 3400 */ 3401 ASSERT(zv->zv_total_opens != 0); 3402 3403 /* 3404 * You may get multiple opens, but only one close. 3405 */ 3406 zv->zv_total_opens--; 3407 if (flags & (FSYNC | FDSYNC)) 3408 zv->zv_sync_cnt--; 3409 3410 if (zv->zv_total_opens == 0) 3411 zvol_last_close(zv); 3412 3413 mutex_exit(&zfsdev_state_lock); 3414 return (0); 3415 } 3416 3417 static int 3418 zvol_d_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 3419 { 3420 zvol_state_t *zv; 3421 rl_t *rl; 3422 off_t offset, length; 3423 int i, error; 3424 boolean_t sync; 3425 3426 zv = dev->si_drv2; 3427 3428 error = 0; 3429 KASSERT(zv->zv_total_opens > 0, 3430 ("Device with zero access count in zvol_d_ioctl")); 3431 3432 i = IOCPARM_LEN(cmd); 3433 switch (cmd) { 3434 case DIOCGSECTORSIZE: 3435 *(u_int *)data = DEV_BSIZE; 3436 break; 3437 case DIOCGMEDIASIZE: 3438 *(off_t *)data = zv->zv_volsize; 3439 break; 3440 case DIOCGFLUSH: 3441 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3442 break; 3443 case DIOCGDELETE: 3444 if (!zvol_unmap_enabled) 3445 break; 3446 3447 offset = ((off_t *)data)[0]; 3448 length = ((off_t *)data)[1]; 3449 if ((offset % DEV_BSIZE) != 0 || (length % DEV_BSIZE) != 0 || 3450 offset < 0 || offset >= zv->zv_volsize || 3451 length <= 0) { 3452 printf("%s: offset=%jd length=%jd\n", __func__, offset, 3453 length); 3454 error = EINVAL; 3455 break; 3456 } 3457 3458 rl = zfs_range_lock(&zv->zv_znode, offset, length, RL_WRITER); 3459 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 3460 error = dmu_tx_assign(tx, TXG_WAIT); 3461 if (error != 0) { 3462 sync = FALSE; 3463 dmu_tx_abort(tx); 3464 } else { 3465 sync = (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 3466 zvol_log_truncate(zv, tx, offset, length, sync); 3467 dmu_tx_commit(tx); 3468 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 3469 offset, length); 3470 } 3471 zfs_range_unlock(rl); 3472 if (sync) 3473 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3474 break; 3475 case DIOCGSTRIPESIZE: 3476 *(off_t *)data = zv->zv_volblocksize; 3477 break; 3478 case DIOCGSTRIPEOFFSET: 3479 *(off_t *)data = 0; 3480 break; 3481 case DIOCGATTR: { 3482 spa_t *spa = dmu_objset_spa(zv->zv_objset); 3483 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 3484 uint64_t refd, avail, usedobjs, availobjs; 3485 3486 if (strcmp(arg->name, "GEOM::candelete") == 0) 3487 arg->value.i = 1; 3488 else if (strcmp(arg->name, "blocksavail") == 0) { 3489 dmu_objset_space(zv->zv_objset, &refd, &avail, 3490 &usedobjs, &availobjs); 3491 arg->value.off = avail / DEV_BSIZE; 3492 } else if (strcmp(arg->name, "blocksused") == 0) { 3493 dmu_objset_space(zv->zv_objset, &refd, &avail, 3494 &usedobjs, &availobjs); 3495 arg->value.off = refd / DEV_BSIZE; 3496 } else if (strcmp(arg->name, "poolblocksavail") == 0) { 3497 avail = metaslab_class_get_space(spa_normal_class(spa)); 3498 avail -= metaslab_class_get_alloc(spa_normal_class(spa)); 3499 arg->value.off = avail / DEV_BSIZE; 3500 } else if (strcmp(arg->name, "poolblocksused") == 0) { 3501 refd = metaslab_class_get_alloc(spa_normal_class(spa)); 3502 arg->value.off = refd / DEV_BSIZE; 3503 } else 3504 error = ENOIOCTL; 3505 break; 3506 } 3507 case FIOSEEKHOLE: 3508 case FIOSEEKDATA: { 3509 off_t *off = (off_t *)data; 3510 uint64_t noff; 3511 boolean_t hole; 3512 3513 hole = (cmd == FIOSEEKHOLE); 3514 noff = *off; 3515 error = dmu_offset_next(zv->zv_objset, ZVOL_OBJ, hole, &noff); 3516 *off = noff; 3517 break; 3518 } 3519 default: 3520 error = ENOIOCTL; 3521 } 3522 3523 return (error); 3524 } 3525 #endif /* __FreeBSD__ */ 3526 3527 #ifdef __NetBSD__ 3528 /*ARGSUSED*/ 3529 int 3530 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 3531 { 3532 zvol_state_t *zv; 3533 int error = 0; 3534 3535 mutex_enter(&zfsdev_state_lock); 3536 3537 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 3538 3539 if (zv == NULL) { 3540 mutex_exit(&zfsdev_state_lock); 3541 return (ENXIO); 3542 } 3543 3544 switch(cmd) { 3545 case DIOCGWEDGEINFO: 3546 { 3547 struct dkwedge_info *dkw = (void *) arg; 3548 3549 strlcpy(dkw->dkw_devname, zv->zv_name, 16); 3550 strlcpy(dkw->dkw_wname, zv->zv_name, MAXPATHLEN); 3551 strlcpy(dkw->dkw_parent, zv->zv_name, 16); 3552 3553 dkw->dkw_offset = 0; 3554 /* XXX NetBSD supports only DEV_BSIZE device block 3555 size zv_volblocksize >> DEV_BSIZE*/ 3556 dkw->dkw_size = (zv->zv_volsize / DEV_BSIZE); 3557 dprintf("dkw %"PRIu64" volsize %"PRIu64" volblock %"PRIu64" \n", 3558 dkw->dkw_size, zv->zv_volsize, zv->zv_volblocksize); 3559 strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS); 3560 3561 break; 3562 } 3563 3564 case DIOCGDISKINFO: 3565 { 3566 struct plistref *pref = (struct plistref *) arg; 3567 3568 if (zv->zv_dk.dk_info == NULL) { 3569 mutex_exit(&zfsdev_state_lock); 3570 return ENOTSUP; 3571 } else 3572 prop_dictionary_copyout_ioctl(pref, cmd, 3573 zv->zv_dk.dk_info); 3574 3575 break; 3576 } 3577 3578 default: 3579 aprint_debug("unknown disk_ioctl called\n"); 3580 error = ENOTTY; 3581 break; 3582 } 3583 3584 mutex_exit(&zfsdev_state_lock); 3585 return (error); 3586 } 3587 #endif /* __NetBSD__ */ 3588