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 (at) 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 (at) 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 #ifdef __NetBSD__ 76 #include <sys/disklabel.h> 77 #endif 78 #include <sys/dkio.h> 79 #include <sys/byteorder.h> 80 #include <sys/sunddi.h> 81 #include <sys/dirent.h> 82 #include <sys/policy.h> 83 #include <sys/queue.h> 84 #include <sys/fs/zfs.h> 85 #include <sys/zfs_ioctl.h> 86 #include <sys/zil.h> 87 #include <sys/refcount.h> 88 #include <sys/zfs_znode.h> 89 #include <sys/zfs_rlock.h> 90 #include <sys/vdev_impl.h> 91 #include <sys/vdev_raidz.h> 92 #include <sys/zvol.h> 93 #include <sys/zil_impl.h> 94 #include <sys/dbuf.h> 95 #include <sys/dmu_tx.h> 96 #include <sys/zfeature.h> 97 #include <sys/zio_checksum.h> 98 #include <sys/filio.h> 99 100 #include "zfs_namecheck.h" 101 102 #ifdef __FreeBSD__ 103 #include <sys/bio.h> 104 #include <geom/geom.h> 105 106 struct g_class zfs_zvol_class = { 107 .name = "ZFS::ZVOL", 108 .version = G_VERSION, 109 }; 110 111 DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol); 112 #endif 113 114 #ifdef __NetBSD__ 115 #include <sys/pathname.h> 116 #include <prop/proplib.h> 117 118 #define DROP_GIANT() /* nothing */ 119 #define PICKUP_GIANT() /* nothing */ 120 121 void zvol_minphys(struct buf *); 122 static struct dkdriver zvol_dkdriver = { zvol_strategy, zvol_minphys }; 123 124 #define bioerror(bp, er) ((bp)->b_error = (er)) 125 #define b_edev b_dev 126 #endif 127 128 void *zfsdev_state; 129 static char *zvol_tag = "zvol_tag"; 130 131 #define ZVOL_DUMPSIZE "dumpsize" 132 133 #ifdef __FreeBSD__ 134 /* 135 * In FreeBSD we've replaced the upstream zfsdev_state_lock with the 136 * spa_namespace_lock in the ZVOL code. 137 */ 138 #define zfsdev_state_lock spa_namespace_lock 139 #else 140 /* 141 * This lock protects the zfsdev_state structure from being modified 142 * while it's being used, e.g. an open that comes in before a create 143 * finishes. It also protects temporary opens of the dataset so that, 144 * e.g., an open doesn't get a spurious EBUSY. 145 */ 146 kmutex_t zfsdev_state_lock; 147 #endif 148 static uint32_t zvol_minors; 149 150 #ifndef illumos 151 SYSCTL_DECL(_vfs_zfs); 152 SYSCTL_NODE(_vfs_zfs, OID_AUTO, vol, CTLFLAG_RW, 0, "ZFS VOLUME"); 153 static int volmode = ZFS_VOLMODE_GEOM; 154 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, mode, CTLFLAG_RWTUN, &volmode, 0, 155 "Expose as GEOM providers (1), device files (2) or neither"); 156 static boolean_t zpool_on_zvol = B_FALSE; 157 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, recursive, CTLFLAG_RWTUN, &zpool_on_zvol, 0, 158 "Allow zpools to use zvols as vdevs (DANGEROUS)"); 159 160 #endif 161 typedef struct zvol_extent { 162 list_node_t ze_node; 163 dva_t ze_dva; /* dva associated with this extent */ 164 uint64_t ze_nblks; /* number of blocks in extent */ 165 } zvol_extent_t; 166 167 /* 168 * The in-core state of each volume. 169 */ 170 typedef struct zvol_state { 171 #ifndef illumos 172 LIST_ENTRY(zvol_state) zv_links; 173 #endif 174 char zv_name[MAXPATHLEN]; /* pool/dd name */ 175 uint64_t zv_volsize; /* amount of space we advertise */ 176 uint64_t zv_volblocksize; /* volume block size */ 177 #ifdef __FreeBSD__ 178 struct cdev *zv_dev; /* non-GEOM device */ 179 struct g_provider *zv_provider; /* GEOM provider */ 180 #else 181 minor_t zv_minor; /* minor number */ 182 #endif 183 uint8_t zv_min_bs; /* minimum addressable block shift */ 184 uint8_t zv_flags; /* readonly, dumpified, etc. */ 185 objset_t *zv_objset; /* objset handle */ 186 #if defined(illumos) || defined(__NetBSD__) 187 uint32_t zv_open_count[OTYPCNT]; /* open counts */ 188 #endif 189 uint32_t zv_total_opens; /* total open count */ 190 uint32_t zv_sync_cnt; /* synchronous open count */ 191 zilog_t *zv_zilog; /* ZIL handle */ 192 list_t zv_extents; /* List of extents for dump */ 193 znode_t zv_znode; /* for range locking */ 194 dmu_buf_t *zv_dbuf; /* bonus handle */ 195 #ifdef __FreeBSD__ 196 int zv_state; 197 int zv_volmode; /* Provide GEOM or cdev */ 198 struct bio_queue_head zv_queue; 199 struct mtx zv_queue_mtx; /* zv_queue mutex */ 200 #endif 201 #ifdef __NetBSD__ 202 struct disk zv_dk; /* disk statistics */ 203 kmutex_t zv_dklock; /* disk statistics */ 204 #endif 205 } zvol_state_t; 206 207 #ifndef illumos 208 static LIST_HEAD(, zvol_state) all_zvols; 209 #endif 210 /* 211 * zvol specific flags 212 */ 213 #define ZVOL_RDONLY 0x1 214 #define ZVOL_DUMPIFIED 0x2 215 #define ZVOL_EXCL 0x4 216 #define ZVOL_WCE 0x8 217 218 /* 219 * zvol maximum transfer in one DMU tx. 220 */ 221 int zvol_maxphys = DMU_MAX_ACCESS/2; 222 223 /* 224 * Toggle unmap functionality. 225 */ 226 boolean_t zvol_unmap_enabled = B_TRUE; 227 228 /* 229 * If true, unmaps requested as synchronous are executed synchronously, 230 * otherwise all unmaps are asynchronous. 231 */ 232 boolean_t zvol_unmap_sync_enabled = B_FALSE; 233 234 #ifdef __FreeBSD__ 235 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_enabled, CTLFLAG_RWTUN, 236 &zvol_unmap_enabled, 0, 237 "Enable UNMAP functionality"); 238 239 SYSCTL_INT(_vfs_zfs_vol, OID_AUTO, unmap_sync_enabled, CTLFLAG_RWTUN, 240 &zvol_unmap_sync_enabled, 0, 241 "UNMAPs requested as sync are executed synchronously"); 242 243 static d_open_t zvol_d_open; 244 static d_close_t zvol_d_close; 245 static d_read_t zvol_read; 246 static d_write_t zvol_write; 247 static d_ioctl_t zvol_d_ioctl; 248 static d_strategy_t zvol_strategy; 249 250 static struct cdevsw zvol_cdevsw = { 251 .d_version = D_VERSION, 252 .d_open = zvol_d_open, 253 .d_close = zvol_d_close, 254 .d_read = zvol_read, 255 .d_write = zvol_write, 256 .d_ioctl = zvol_d_ioctl, 257 .d_strategy = zvol_strategy, 258 .d_name = "zvol", 259 .d_flags = D_DISK | D_TRACKCLOSE, 260 }; 261 262 static void zvol_geom_run(zvol_state_t *zv); 263 static void zvol_geom_destroy(zvol_state_t *zv); 264 static int zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace); 265 static void zvol_geom_start(struct bio *bp); 266 static void zvol_geom_worker(void *arg); 267 static void zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, 268 uint64_t len, boolean_t sync); 269 #endif /* __FreeBSD__ */ 270 #ifdef __NetBSD__ 271 /* XXXNETBSD need devsw, etc */ 272 #endif 273 274 extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 275 nvlist_t *, nvlist_t *); 276 static int zvol_remove_zv(zvol_state_t *); 277 static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 278 static int zvol_dumpify(zvol_state_t *zv); 279 static int zvol_dump_fini(zvol_state_t *zv); 280 static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 281 282 static void 283 zvol_size_changed(zvol_state_t *zv, uint64_t volsize) 284 { 285 #ifdef illumos 286 dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor); 287 288 zv->zv_volsize = volsize; 289 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 290 "Size", volsize) == DDI_SUCCESS); 291 VERIFY(ddi_prop_update_int64(dev, zfs_dip, 292 "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 293 294 /* Notify specfs to invalidate the cached size */ 295 spec_size_invalidate(dev, VBLK); 296 spec_size_invalidate(dev, VCHR); 297 #endif /* illumos */ 298 #ifdef __FreeBSD__ 299 zv->zv_volsize = volsize; 300 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 301 struct g_provider *pp; 302 303 pp = zv->zv_provider; 304 if (pp == NULL) 305 return; 306 g_topology_lock(); 307 308 /* 309 * Do not invoke resize event when initial size was zero. 310 * ZVOL initializes the size on first open, this is not 311 * real resizing. 312 */ 313 if (pp->mediasize == 0) 314 pp->mediasize = zv->zv_volsize; 315 else 316 g_resize_provider(pp, zv->zv_volsize); 317 g_topology_unlock(); 318 } 319 #endif /* __FreeBSD__ */ 320 #ifdef __NetBSD__ 321 struct disk_geom *dg = &zv->zv_dk.dk_geom; 322 objset_t *os = zv->zv_objset; 323 spa_t *spa = dmu_objset_spa(os); 324 unsigned secsize; 325 326 zv->zv_volsize = volsize; 327 328 secsize = MAX(DEV_BSIZE, 1U << spa->spa_max_ashift); 329 330 memset(dg, 0, sizeof(*dg)); 331 dg->dg_secsize = secsize; 332 dg->dg_secperunit = volsize / secsize; 333 disk_set_info(NULL, &zv->zv_dk, "ZVOL"); 334 #endif 335 } 336 337 338 int 339 zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 340 { 341 if (volsize == 0) 342 return (SET_ERROR(EINVAL)); 343 344 if (volsize % blocksize != 0) 345 return (SET_ERROR(EINVAL)); 346 347 #ifdef _ILP32 348 if (volsize - 1 > SPEC_MAXOFFSET_T) 349 return (SET_ERROR(EOVERFLOW)); 350 #endif 351 return (0); 352 } 353 354 int 355 zvol_check_volblocksize(uint64_t volblocksize) 356 { 357 if (volblocksize < SPA_MINBLOCKSIZE || 358 volblocksize > SPA_OLD_MAXBLOCKSIZE || 359 !ISP2(volblocksize)) 360 return (SET_ERROR(EDOM)); 361 362 return (0); 363 } 364 365 int 366 zvol_get_stats(objset_t *os, nvlist_t *nv) 367 { 368 int error; 369 dmu_object_info_t doi; 370 uint64_t val; 371 372 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 373 if (error) 374 return (error); 375 376 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 377 378 error = dmu_object_info(os, ZVOL_OBJ, &doi); 379 380 if (error == 0) { 381 dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 382 doi.doi_data_block_size); 383 } 384 385 return (error); 386 } 387 388 static zvol_state_t * 389 zvol_minor_lookup(const char *name) 390 { 391 #ifdef illumos 392 minor_t minor; 393 #endif 394 zvol_state_t *zv; 395 396 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 397 398 #ifdef illumos 399 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) 400 #else 401 LIST_FOREACH(zv, &all_zvols, zv_links) 402 #endif 403 { 404 #ifdef illumos 405 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 406 if (zv == NULL) 407 continue; 408 #endif 409 410 if (strcmp(zv->zv_name, name) == 0) 411 return (zv); 412 } 413 414 return (NULL); 415 } 416 417 /* extent mapping arg */ 418 struct maparg { 419 zvol_state_t *ma_zv; 420 uint64_t ma_blks; 421 }; 422 423 /*ARGSUSED*/ 424 static int 425 zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 426 const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 427 { 428 struct maparg *ma = arg; 429 zvol_extent_t *ze; 430 int bs = ma->ma_zv->zv_volblocksize; 431 432 if (bp == NULL || BP_IS_HOLE(bp) || 433 zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 434 return (0); 435 436 VERIFY(!BP_IS_EMBEDDED(bp)); 437 438 VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 439 ma->ma_blks++; 440 441 /* Abort immediately if we have encountered gang blocks */ 442 if (BP_IS_GANG(bp)) 443 return (SET_ERROR(EFRAGS)); 444 445 /* 446 * See if the block is at the end of the previous extent. 447 */ 448 ze = list_tail(&ma->ma_zv->zv_extents); 449 if (ze && 450 DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 451 DVA_GET_OFFSET(BP_IDENTITY(bp)) == 452 DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 453 ze->ze_nblks++; 454 return (0); 455 } 456 457 dprintf_bp(bp, "%s", "next blkptr:"); 458 459 /* start a new extent */ 460 ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 461 ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 462 ze->ze_nblks = 1; 463 list_insert_tail(&ma->ma_zv->zv_extents, ze); 464 return (0); 465 } 466 467 static void 468 zvol_free_extents(zvol_state_t *zv) 469 { 470 zvol_extent_t *ze; 471 472 while (ze = list_head(&zv->zv_extents)) { 473 list_remove(&zv->zv_extents, ze); 474 kmem_free(ze, sizeof (zvol_extent_t)); 475 } 476 } 477 478 static int 479 zvol_get_lbas(zvol_state_t *zv) 480 { 481 objset_t *os = zv->zv_objset; 482 struct maparg ma; 483 int err; 484 485 ma.ma_zv = zv; 486 ma.ma_blks = 0; 487 zvol_free_extents(zv); 488 489 /* commit any in-flight changes before traversing the dataset */ 490 txg_wait_synced(dmu_objset_pool(os), 0); 491 err = traverse_dataset(dmu_objset_ds(os), 0, 492 TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 493 if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 494 zvol_free_extents(zv); 495 return (err ? err : EIO); 496 } 497 498 return (0); 499 } 500 501 /* ARGSUSED */ 502 void 503 zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 504 { 505 zfs_creat_t *zct = arg; 506 nvlist_t *nvprops = zct->zct_props; 507 int error; 508 uint64_t volblocksize, volsize; 509 510 VERIFY(nvlist_lookup_uint64(nvprops, 511 zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 512 if (nvlist_lookup_uint64(nvprops, 513 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 514 volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 515 516 /* 517 * These properties must be removed from the list so the generic 518 * property setting step won't apply to them. 519 */ 520 VERIFY(nvlist_remove_all(nvprops, 521 zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 522 (void) nvlist_remove_all(nvprops, 523 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 524 525 error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 526 DMU_OT_NONE, 0, tx); 527 ASSERT(error == 0); 528 529 error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 530 DMU_OT_NONE, 0, tx); 531 ASSERT(error == 0); 532 533 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 534 ASSERT(error == 0); 535 } 536 537 /* 538 * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 539 * implement DKIOCFREE/free-long-range. 540 */ 541 static int 542 zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap) 543 { 544 uint64_t offset, length; 545 546 if (byteswap) 547 byteswap_uint64_array(lr, sizeof (*lr)); 548 549 offset = lr->lr_offset; 550 length = lr->lr_length; 551 552 return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 553 } 554 555 /* 556 * Replay a TX_WRITE ZIL transaction that didn't get committed 557 * after a system failure 558 */ 559 static int 560 zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 561 { 562 objset_t *os = zv->zv_objset; 563 char *data = (char *)(lr + 1); /* data follows lr_write_t */ 564 uint64_t offset, length; 565 dmu_tx_t *tx; 566 int error; 567 568 if (byteswap) 569 byteswap_uint64_array(lr, sizeof (*lr)); 570 571 offset = lr->lr_offset; 572 length = lr->lr_length; 573 574 /* If it's a dmu_sync() block, write the whole block */ 575 if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 576 uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 577 if (length < blocksize) { 578 offset -= offset % blocksize; 579 length = blocksize; 580 } 581 } 582 583 tx = dmu_tx_create(os); 584 dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 585 error = dmu_tx_assign(tx, TXG_WAIT); 586 if (error) { 587 dmu_tx_abort(tx); 588 } else { 589 dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 590 dmu_tx_commit(tx); 591 } 592 593 return (error); 594 } 595 596 /* ARGSUSED */ 597 static int 598 zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 599 { 600 return (SET_ERROR(ENOTSUP)); 601 } 602 603 /* 604 * Callback vectors for replaying records. 605 * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 606 */ 607 zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 608 zvol_replay_err, /* 0 no such transaction type */ 609 zvol_replay_err, /* TX_CREATE */ 610 zvol_replay_err, /* TX_MKDIR */ 611 zvol_replay_err, /* TX_MKXATTR */ 612 zvol_replay_err, /* TX_SYMLINK */ 613 zvol_replay_err, /* TX_REMOVE */ 614 zvol_replay_err, /* TX_RMDIR */ 615 zvol_replay_err, /* TX_LINK */ 616 zvol_replay_err, /* TX_RENAME */ 617 zvol_replay_write, /* TX_WRITE */ 618 zvol_replay_truncate, /* TX_TRUNCATE */ 619 zvol_replay_err, /* TX_SETATTR */ 620 zvol_replay_err, /* TX_ACL */ 621 zvol_replay_err, /* TX_CREATE_ACL */ 622 zvol_replay_err, /* TX_CREATE_ATTR */ 623 zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 624 zvol_replay_err, /* TX_MKDIR_ACL */ 625 zvol_replay_err, /* TX_MKDIR_ATTR */ 626 zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 627 zvol_replay_err, /* TX_WRITE2 */ 628 }; 629 630 #ifdef illumos 631 int 632 zvol_name2minor(const char *name, minor_t *minor) 633 { 634 zvol_state_t *zv; 635 636 mutex_enter(&zfsdev_state_lock); 637 zv = zvol_minor_lookup(name); 638 if (minor && zv) 639 *minor = zv->zv_minor; 640 mutex_exit(&zfsdev_state_lock); 641 return (zv ? 0 : -1); 642 } 643 #endif /* illumos */ 644 645 /* 646 * Create a minor node (plus a whole lot more) for the specified volume. 647 */ 648 int 649 zvol_create_minor(const char *name) 650 { 651 zfs_soft_state_t *zs; 652 zvol_state_t *zv; 653 objset_t *os; 654 int error; 655 #ifdef illumos 656 dmu_object_info_t doi; 657 minor_t minor = 0; 658 char chrbuf[30], blkbuf[30]; 659 #endif 660 #ifdef __FreeBSD__ 661 struct g_provider *pp; 662 struct g_geom *gp; 663 uint64_t mode; 664 665 ZFS_LOG(1, "Creating ZVOL %s...", name); 666 #endif 667 #ifdef __NetBSD__ 668 dmu_object_info_t doi; 669 minor_t minor = 0; 670 vnode_t *vp = NULL; 671 char *devpath; 672 size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 2; 673 #endif 674 675 mutex_enter(&zfsdev_state_lock); 676 677 if (zvol_minor_lookup(name) != NULL) { 678 mutex_exit(&zfsdev_state_lock); 679 return (SET_ERROR(EEXIST)); 680 } 681 682 /* lie and say we're read-only */ 683 error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); 684 685 if (error) { 686 mutex_exit(&zfsdev_state_lock); 687 return (error); 688 } 689 690 #ifdef illumos 691 if ((minor = zfsdev_minor_alloc()) == 0) { 692 dmu_objset_disown(os, FTAG); 693 mutex_exit(&zfsdev_state_lock); 694 return (SET_ERROR(ENXIO)); 695 } 696 697 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 698 dmu_objset_disown(os, FTAG); 699 mutex_exit(&zfsdev_state_lock); 700 return (SET_ERROR(EAGAIN)); 701 } 702 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 703 (char *)name); 704 705 (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 706 707 if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 708 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 709 ddi_soft_state_free(zfsdev_state, minor); 710 dmu_objset_disown(os, FTAG); 711 mutex_exit(&zfsdev_state_lock); 712 return (SET_ERROR(EAGAIN)); 713 } 714 715 (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 716 717 if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 718 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 719 ddi_remove_minor_node(zfs_dip, chrbuf); 720 ddi_soft_state_free(zfsdev_state, minor); 721 dmu_objset_disown(os, FTAG); 722 mutex_exit(&zfsdev_state_lock); 723 return (SET_ERROR(EAGAIN)); 724 } 725 726 zs = ddi_get_soft_state(zfsdev_state, minor); 727 zs->zss_type = ZSST_ZVOL; 728 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 729 #endif /* illumos */ 730 731 #ifdef __FreeBSD__ 732 zv = kmem_zalloc(sizeof(*zv), KM_SLEEP); 733 zv->zv_state = 0; 734 error = dsl_prop_get_integer(name, 735 zfs_prop_to_name(ZFS_PROP_VOLMODE), &mode, NULL); 736 if (error != 0 || mode == ZFS_VOLMODE_DEFAULT) 737 mode = volmode; 738 739 DROP_GIANT(); 740 zv->zv_volmode = mode; 741 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 742 g_topology_lock(); 743 gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name); 744 gp->start = zvol_geom_start; 745 gp->access = zvol_geom_access; 746 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, name); 747 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND; 748 pp->sectorsize = DEV_BSIZE; 749 pp->mediasize = 0; 750 pp->private = zv; 751 752 zv->zv_provider = pp; 753 bioq_init(&zv->zv_queue); 754 mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF); 755 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) { 756 struct make_dev_args args; 757 758 make_dev_args_init(&args); 759 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 760 args.mda_devsw = &zvol_cdevsw; 761 args.mda_cr = NULL; 762 args.mda_uid = UID_ROOT; 763 args.mda_gid = GID_OPERATOR; 764 args.mda_mode = 0640; 765 args.mda_si_drv2 = zv; 766 error = make_dev_s(&args, &zv->zv_dev, 767 "%s/%s", ZVOL_DRIVER, name); 768 if (error != 0) { 769 kmem_free(zv, sizeof(*zv)); 770 dmu_objset_disown(os, FTAG); 771 mutex_exit(&zfsdev_state_lock); 772 return (error); 773 } 774 zv->zv_dev->si_iosize_max = MAXPHYS; 775 } 776 LIST_INSERT_HEAD(&all_zvols, zv, zv_links); 777 #endif /* __FreeBSD__ */ 778 779 #ifdef __NetBSD__ 780 781 /* 782 * If there's an existing /dev/zvol symlink, try to use the 783 * same minor number we used last time. 784 */ 785 devpath = kmem_alloc(devpathlen, KM_SLEEP); 786 787 /* Get full path to ZFS volume disk device */ 788 (void) snprintf(devpath, devpathlen, "%s/%s", ZVOL_FULL_DEV_DIR, name); 789 790 error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 791 792 if (error == 0 && vp->v_type != VBLK) { 793 error = EINVAL; 794 } 795 796 if (error == 0) { 797 struct stat sb; 798 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 799 error = vn_stat(vp, &sb); 800 VOP_UNLOCK(vp, 0); 801 if (error == 0) { 802 minor = getminor(sb.st_rdev); 803 } 804 } 805 806 if (vp != NULL) 807 VN_RELE(vp); 808 809 /* 810 * If we found a minor but it's already in use, we must pick a new one. 811 */ 812 813 if (minor != 0 && zfsdev_get_soft_state(minor, ZSST_ZVOL) != NULL) 814 minor = 0; 815 816 if (minor == 0) 817 minor = zfsdev_minor_alloc(); 818 819 if (minor == 0) { 820 dmu_objset_disown(os, zvol_tag); 821 mutex_exit(&zfsdev_state_lock); 822 kmem_free(devpath, devpathlen); 823 return (ENXIO); 824 } 825 826 if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 827 dmu_objset_disown(os, zvol_tag); 828 mutex_exit(&zfsdev_state_lock); 829 kmem_free(devpath, devpathlen); 830 return (EAGAIN); 831 } 832 (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 833 (char *)name); 834 835 if (ddi_create_minor_node(zfs_dip, (char *)name, S_IFCHR, 836 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 837 ddi_soft_state_free(zfsdev_state, minor); 838 dmu_objset_disown(os, zvol_tag); 839 mutex_exit(&zfsdev_state_lock); 840 kmem_free(devpath, devpathlen); 841 return (EAGAIN); 842 } 843 844 if (ddi_create_minor_node(zfs_dip, (char *)name, S_IFBLK, 845 minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 846 ddi_remove_minor_node(zfs_dip, (char *)name); 847 ddi_soft_state_free(zfsdev_state, minor); 848 dmu_objset_disown(os, zvol_tag); 849 mutex_exit(&zfsdev_state_lock); 850 kmem_free(devpath, devpathlen); 851 return (EAGAIN); 852 } 853 zs = ddi_get_soft_state(zfsdev_state, minor); 854 zs->zss_type = ZSST_ZVOL; 855 zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 856 857 disk_init(&zv->zv_dk, name, &zvol_dkdriver); 858 disk_attach(&zv->zv_dk); 859 mutex_init(&zv->zv_dklock, NULL, MUTEX_DEFAULT, NULL); 860 861 LIST_INSERT_HEAD(&all_zvols, zv, zv_links); 862 #endif /* __NetBSD__ */ 863 864 (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 865 zv->zv_min_bs = DEV_BSHIFT; 866 #if defined(illumos) || defined(__NetBSD__) 867 zv->zv_minor = minor; 868 #endif 869 zv->zv_objset = os; 870 if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 871 zv->zv_flags |= ZVOL_RDONLY; 872 mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 873 avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 874 sizeof (rl_t), offsetof(rl_t, r_node)); 875 list_create(&zv->zv_extents, sizeof (zvol_extent_t), 876 offsetof(zvol_extent_t, ze_node)); 877 #if defined(illumos) || defined(__NetBSD__) 878 /* get and cache the blocksize */ 879 error = dmu_object_info(os, ZVOL_OBJ, &doi); 880 ASSERT(error == 0); 881 zv->zv_volblocksize = doi.doi_data_block_size; 882 #endif 883 884 if (spa_writeable(dmu_objset_spa(os))) { 885 if (zil_replay_disable) 886 zil_destroy(dmu_objset_zil(os), B_FALSE); 887 else 888 zil_replay(os, zv, zvol_replay_vector); 889 } 890 dmu_objset_disown(os, FTAG); 891 zv->zv_objset = NULL; 892 893 zvol_minors++; 894 895 mutex_exit(&zfsdev_state_lock); 896 #ifdef __FreeBSD__ 897 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 898 zvol_geom_run(zv); 899 g_topology_unlock(); 900 } 901 PICKUP_GIANT(); 902 903 ZFS_LOG(1, "ZVOL %s created.", name); 904 #endif 905 return (0); 906 } 907 908 /* 909 * Remove minor node for the specified volume. 910 */ 911 static int 912 zvol_remove_zv(zvol_state_t *zv) 913 { 914 915 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 916 if (zv->zv_total_opens != 0) 917 return (SET_ERROR(EBUSY)); 918 919 #ifdef illumos 920 char nmbuf[20]; 921 minor_t minor = zv->zv_minor; 922 923 (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 924 ddi_remove_minor_node(zfs_dip, nmbuf); 925 926 (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 927 ddi_remove_minor_node(zfs_dip, nmbuf); 928 #endif 929 #ifdef __FreeBSD__ 930 ZFS_LOG(1, "ZVOL %s destroyed.", zv->zv_name); 931 932 LIST_REMOVE(zv, zv_links); 933 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 934 g_topology_lock(); 935 zvol_geom_destroy(zv); 936 g_topology_unlock(); 937 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) { 938 if (zv->zv_dev != NULL) 939 destroy_dev(zv->zv_dev); 940 } 941 #endif 942 #ifdef __NetBSD__ 943 char nmbuf[20]; 944 minor_t minor = zv->zv_minor; 945 946 LIST_REMOVE(zv, zv_links); 947 948 (void) snprintf(nmbuf, sizeof (nmbuf), "%s", zv->zv_name); 949 ddi_remove_minor_node(zfs_dip, nmbuf); 950 951 (void) snprintf(nmbuf, sizeof (nmbuf), "%s", zv->zv_name); 952 ddi_remove_minor_node(zfs_dip, nmbuf); 953 954 disk_detach(&zv->zv_dk); 955 disk_destroy(&zv->zv_dk); 956 mutex_destroy(&zv->zv_dklock); 957 #endif 958 959 avl_destroy(&zv->zv_znode.z_range_avl); 960 mutex_destroy(&zv->zv_znode.z_range_lock); 961 962 kmem_free(zv, sizeof (zvol_state_t)); 963 #ifdef illumos 964 ddi_soft_state_free(zfsdev_state, minor); 965 #endif 966 #ifdef __NetBSD__ 967 ddi_soft_state_free(zfsdev_state, minor); 968 #endif 969 zvol_minors--; 970 return (0); 971 } 972 973 int 974 zvol_remove_minor(const char *name) 975 { 976 zvol_state_t *zv; 977 int rc; 978 979 mutex_enter(&zfsdev_state_lock); 980 if ((zv = zvol_minor_lookup(name)) == NULL) { 981 mutex_exit(&zfsdev_state_lock); 982 return (SET_ERROR(ENXIO)); 983 } 984 #ifdef __NetBSD__ 985 disk_detach(&zv->zv_dk); 986 disk_destroy(&zv->zv_dk); 987 mutex_destroy(&zv->zv_dklock); 988 #endif 989 rc = zvol_remove_zv(zv); 990 mutex_exit(&zfsdev_state_lock); 991 return (rc); 992 } 993 994 int 995 zvol_first_open(zvol_state_t *zv) 996 { 997 dmu_object_info_t doi; 998 objset_t *os; 999 uint64_t volsize; 1000 int error; 1001 uint64_t readonly; 1002 1003 /* lie and say we're read-only */ 1004 error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 1005 zvol_tag, &os); 1006 if (error) 1007 return (error); 1008 1009 zv->zv_objset = os; 1010 error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 1011 if (error) { 1012 ASSERT(error == 0); 1013 dmu_objset_disown(os, zvol_tag); 1014 return (error); 1015 } 1016 1017 /* get and cache the blocksize */ 1018 error = dmu_object_info(os, ZVOL_OBJ, &doi); 1019 if (error) { 1020 ASSERT(error == 0); 1021 dmu_objset_disown(os, zvol_tag); 1022 return (error); 1023 } 1024 zv->zv_volblocksize = doi.doi_data_block_size; 1025 1026 error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf); 1027 if (error) { 1028 dmu_objset_disown(os, zvol_tag); 1029 return (error); 1030 } 1031 1032 zvol_size_changed(zv, volsize); 1033 zv->zv_zilog = zil_open(os, zvol_get_data); 1034 1035 VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 1036 NULL) == 0); 1037 if (readonly || dmu_objset_is_snapshot(os) || 1038 !spa_writeable(dmu_objset_spa(os))) 1039 zv->zv_flags |= ZVOL_RDONLY; 1040 else 1041 zv->zv_flags &= ~ZVOL_RDONLY; 1042 return (error); 1043 } 1044 1045 void 1046 zvol_last_close(zvol_state_t *zv) 1047 { 1048 zil_close(zv->zv_zilog); 1049 zv->zv_zilog = NULL; 1050 1051 dmu_buf_rele(zv->zv_dbuf, zvol_tag); 1052 zv->zv_dbuf = NULL; 1053 1054 /* 1055 * Evict cached data 1056 */ 1057 if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && 1058 !(zv->zv_flags & ZVOL_RDONLY)) 1059 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1060 dmu_objset_evict_dbufs(zv->zv_objset); 1061 1062 dmu_objset_disown(zv->zv_objset, zvol_tag); 1063 zv->zv_objset = NULL; 1064 } 1065 1066 #ifdef illumos 1067 int 1068 zvol_prealloc(zvol_state_t *zv) 1069 { 1070 objset_t *os = zv->zv_objset; 1071 dmu_tx_t *tx; 1072 uint64_t refd, avail, usedobjs, availobjs; 1073 uint64_t resid = zv->zv_volsize; 1074 uint64_t off = 0; 1075 1076 /* Check the space usage before attempting to allocate the space */ 1077 dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 1078 if (avail < zv->zv_volsize) 1079 return (SET_ERROR(ENOSPC)); 1080 1081 /* Free old extents if they exist */ 1082 zvol_free_extents(zv); 1083 1084 while (resid != 0) { 1085 int error; 1086 uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE); 1087 1088 tx = dmu_tx_create(os); 1089 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1090 error = dmu_tx_assign(tx, TXG_WAIT); 1091 if (error) { 1092 dmu_tx_abort(tx); 1093 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 1094 return (error); 1095 } 1096 dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 1097 dmu_tx_commit(tx); 1098 off += bytes; 1099 resid -= bytes; 1100 } 1101 txg_wait_synced(dmu_objset_pool(os), 0); 1102 1103 return (0); 1104 } 1105 #endif /* illumos */ 1106 1107 static int 1108 zvol_update_volsize(objset_t *os, uint64_t volsize) 1109 { 1110 dmu_tx_t *tx; 1111 int error; 1112 1113 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1114 1115 tx = dmu_tx_create(os); 1116 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1117 dmu_tx_mark_netfree(tx); 1118 error = dmu_tx_assign(tx, TXG_WAIT); 1119 if (error) { 1120 dmu_tx_abort(tx); 1121 return (error); 1122 } 1123 1124 error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 1125 &volsize, tx); 1126 dmu_tx_commit(tx); 1127 1128 if (error == 0) 1129 error = dmu_free_long_range(os, 1130 ZVOL_OBJ, volsize, DMU_OBJECT_END); 1131 return (error); 1132 } 1133 1134 void 1135 zvol_remove_minors(const char *name) 1136 { 1137 #ifdef illumos 1138 zvol_state_t *zv; 1139 char *namebuf; 1140 minor_t minor; 1141 1142 namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 1143 (void) strncpy(namebuf, name, strlen(name)); 1144 (void) strcat(namebuf, "/"); 1145 mutex_enter(&zfsdev_state_lock); 1146 for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 1147 1148 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1149 if (zv == NULL) 1150 continue; 1151 if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 1152 (void) zvol_remove_zv(zv); 1153 } 1154 kmem_free(namebuf, strlen(name) + 2); 1155 1156 mutex_exit(&zfsdev_state_lock); 1157 #else /* !illumos */ 1158 zvol_state_t *zv, *tzv; 1159 size_t namelen; 1160 1161 namelen = strlen(name); 1162 1163 DROP_GIANT(); 1164 mutex_enter(&zfsdev_state_lock); 1165 1166 LIST_FOREACH_SAFE(zv, &all_zvols, zv_links, tzv) { 1167 if (strcmp(zv->zv_name, name) == 0 || 1168 (strncmp(zv->zv_name, name, namelen) == 0 && 1169 strlen(zv->zv_name) > namelen && (zv->zv_name[namelen] == '/' || 1170 zv->zv_name[namelen] == '@'))) { 1171 (void) zvol_remove_zv(zv); 1172 } 1173 } 1174 1175 mutex_exit(&zfsdev_state_lock); 1176 PICKUP_GIANT(); 1177 #endif /* illumos */ 1178 } 1179 1180 static int 1181 zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) 1182 { 1183 uint64_t old_volsize = 0ULL; 1184 int error = 0; 1185 1186 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1187 1188 /* 1189 * Reinitialize the dump area to the new size. If we 1190 * failed to resize the dump area then restore it back to 1191 * its original size. We must set the new volsize prior 1192 * to calling dumpvp_resize() to ensure that the devices' 1193 * size(9P) is not visible by the dump subsystem. 1194 */ 1195 old_volsize = zv->zv_volsize; 1196 zvol_size_changed(zv, volsize); 1197 1198 #ifdef ZVOL_DUMP 1199 if (zv->zv_flags & ZVOL_DUMPIFIED) { 1200 if ((error = zvol_dumpify(zv)) != 0 || 1201 (error = dumpvp_resize()) != 0) { 1202 int dumpify_error; 1203 1204 (void) zvol_update_volsize(zv->zv_objset, old_volsize); 1205 zvol_size_changed(zv, old_volsize); 1206 dumpify_error = zvol_dumpify(zv); 1207 error = dumpify_error ? dumpify_error : error; 1208 } 1209 } 1210 #endif /* ZVOL_DUMP */ 1211 1212 #ifdef illumos 1213 /* 1214 * Generate a LUN expansion event. 1215 */ 1216 if (error == 0) { 1217 sysevent_id_t eid; 1218 nvlist_t *attr; 1219 char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 1220 1221 (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 1222 zv->zv_minor); 1223 1224 VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1225 VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 1226 1227 (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 1228 ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 1229 1230 nvlist_free(attr); 1231 kmem_free(physpath, MAXPATHLEN); 1232 } 1233 #endif /* illumos */ 1234 return (error); 1235 } 1236 1237 int 1238 zvol_set_volsize(const char *name, uint64_t volsize) 1239 { 1240 zvol_state_t *zv = NULL; 1241 objset_t *os; 1242 int error; 1243 dmu_object_info_t doi; 1244 uint64_t readonly; 1245 boolean_t owned = B_FALSE; 1246 1247 error = dsl_prop_get_integer(name, 1248 zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); 1249 if (error != 0) 1250 return (error); 1251 if (readonly) 1252 return (SET_ERROR(EROFS)); 1253 1254 mutex_enter(&zfsdev_state_lock); 1255 zv = zvol_minor_lookup(name); 1256 1257 if (zv == NULL || zv->zv_objset == NULL) { 1258 if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, 1259 FTAG, &os)) != 0) { 1260 mutex_exit(&zfsdev_state_lock); 1261 return (error); 1262 } 1263 owned = B_TRUE; 1264 if (zv != NULL) 1265 zv->zv_objset = os; 1266 } else { 1267 os = zv->zv_objset; 1268 } 1269 1270 if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 1271 (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0) 1272 goto out; 1273 1274 error = zvol_update_volsize(os, volsize); 1275 1276 if (error == 0 && zv != NULL) 1277 error = zvol_update_live_volsize(zv, volsize); 1278 out: 1279 if (owned) { 1280 dmu_objset_disown(os, FTAG); 1281 if (zv != NULL) 1282 zv->zv_objset = NULL; 1283 } 1284 mutex_exit(&zfsdev_state_lock); 1285 return (error); 1286 } 1287 1288 /*ARGSUSED*/ 1289 #ifdef illumos 1290 int 1291 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 1292 #endif 1293 #ifdef __FreeBSD__ 1294 static int 1295 zvol_open(struct g_provider *pp, int flag, int count) 1296 #endif 1297 #ifdef __NetBSD__ 1298 int 1299 zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 1300 #endif 1301 { 1302 zvol_state_t *zv; 1303 int err = 0; 1304 1305 #ifdef illumos 1306 mutex_enter(&zfsdev_state_lock); 1307 1308 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 1309 if (zv == NULL) { 1310 mutex_exit(&zfsdev_state_lock); 1311 return (SET_ERROR(ENXIO)); 1312 } 1313 1314 if (zv->zv_total_opens == 0) 1315 err = zvol_first_open(zv); 1316 if (err) { 1317 mutex_exit(&zfsdev_state_lock); 1318 return (err); 1319 } 1320 #endif /* !illumos */ 1321 #ifdef __FreeBSD__ 1322 boolean_t locked = B_FALSE; 1323 1324 if (!zpool_on_zvol && tsd_get(zfs_geom_probe_vdev_key) != NULL) { 1325 /* 1326 * if zfs_geom_probe_vdev_key is set, that means that zfs is 1327 * attempting to probe geom providers while looking for a 1328 * replacement for a missing VDEV. In this case, the 1329 * spa_namespace_lock will not be held, but it is still illegal 1330 * to use a zvol as a vdev. Deadlocks can result if another 1331 * thread has spa_namespace_lock 1332 */ 1333 return (EOPNOTSUPP); 1334 } 1335 /* 1336 * Protect against recursively entering spa_namespace_lock 1337 * when spa_open() is used for a pool on a (local) ZVOL(s). 1338 * This is needed since we replaced upstream zfsdev_state_lock 1339 * with spa_namespace_lock in the ZVOL code. 1340 * We are using the same trick as spa_open(). 1341 * Note that calls in zvol_first_open which need to resolve 1342 * pool name to a spa object will enter spa_open() 1343 * recursively, but that function already has all the 1344 * necessary protection. 1345 */ 1346 if (!MUTEX_HELD(&zfsdev_state_lock)) { 1347 mutex_enter(&zfsdev_state_lock); 1348 locked = B_TRUE; 1349 } 1350 1351 zv = pp->private; 1352 if (zv == NULL) { 1353 if (locked) 1354 mutex_exit(&zfsdev_state_lock); 1355 return (SET_ERROR(ENXIO)); 1356 } 1357 1358 if (zv->zv_total_opens == 0) { 1359 err = zvol_first_open(zv); 1360 if (err) { 1361 if (locked) 1362 mutex_exit(&zfsdev_state_lock); 1363 return (err); 1364 } 1365 pp->mediasize = zv->zv_volsize; 1366 pp->stripeoffset = 0; 1367 pp->stripesize = zv->zv_volblocksize; 1368 } 1369 #endif /* __FreeBSD__ */ 1370 #ifdef __NetBSD__ 1371 mutex_enter(&zfsdev_state_lock); 1372 1373 zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 1374 if (zv == NULL) { 1375 mutex_exit(&zfsdev_state_lock); 1376 return (SET_ERROR(ENXIO)); 1377 } 1378 1379 if (zv->zv_total_opens == 0) 1380 err = zvol_first_open(zv); 1381 if (err) { 1382 mutex_exit(&zfsdev_state_lock); 1383 return (err); 1384 } 1385 #endif 1386 1387 if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 1388 err = SET_ERROR(EROFS); 1389 goto out; 1390 } 1391 if (zv->zv_flags & ZVOL_EXCL) { 1392 err = SET_ERROR(EBUSY); 1393 goto out; 1394 } 1395 #ifdef FEXCL 1396 if (flag & FEXCL) { 1397 if (zv->zv_total_opens != 0) { 1398 err = SET_ERROR(EBUSY); 1399 goto out; 1400 } 1401 zv->zv_flags |= ZVOL_EXCL; 1402 } 1403 #endif 1404 1405 #ifdef illumos 1406 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 1407 zv->zv_open_count[otyp]++; 1408 zv->zv_total_opens++; 1409 } 1410 mutex_exit(&zfsdev_state_lock); 1411 #endif 1412 #ifdef __FreeBSD__ 1413 zv->zv_total_opens += count; 1414 if (locked) 1415 mutex_exit(&zfsdev_state_lock); 1416 #endif 1417 #ifdef __NetBSD__ 1418 if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 1419 zv->zv_open_count[otyp]++; 1420 zv->zv_total_opens++; 1421 } 1422 mutex_exit(&zfsdev_state_lock); 1423 #endif 1424 1425 return (err); 1426 out: 1427 if (zv->zv_total_opens == 0) 1428 zvol_last_close(zv); 1429 #ifdef __FreeBSD__ 1430 if (locked) 1431 #endif 1432 mutex_exit(&zfsdev_state_lock); 1433 1434 return (err); 1435 } 1436 1437 /*ARGSUSED*/ 1438 #if defined(illumos) || defined(__NetBSD__) 1439 int 1440 zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 1441 #endif 1442 #ifdef __FreeBSD__ 1443 static int 1444 zvol_close(struct g_provider *pp, int flag, int count) 1445 #endif 1446 { 1447 #if defined(illumos) || defined(__NetBSD__) 1448 minor_t minor = getminor(dev); 1449 zvol_state_t *zv; 1450 int error = 0; 1451 1452 mutex_enter(&zfsdev_state_lock); 1453 1454 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1455 if (zv == NULL) { 1456 mutex_exit(&zfsdev_state_lock); 1457 return (SET_ERROR(ENXIO)); 1458 } 1459 #endif /* illumos */ 1460 #ifdef __FreeBSD__ 1461 zvol_state_t *zv; 1462 int error = 0; 1463 boolean_t locked = B_FALSE; 1464 1465 /* See comment in zvol_open(). */ 1466 if (!MUTEX_HELD(&zfsdev_state_lock)) { 1467 mutex_enter(&zfsdev_state_lock); 1468 locked = B_TRUE; 1469 } 1470 1471 zv = pp->private; 1472 if (zv == NULL) { 1473 if (locked) 1474 mutex_exit(&zfsdev_state_lock); 1475 return (SET_ERROR(ENXIO)); 1476 } 1477 #endif /* __FreeBSD__ */ 1478 1479 if (zv->zv_flags & ZVOL_EXCL) { 1480 ASSERT(zv->zv_total_opens == 1); 1481 zv->zv_flags &= ~ZVOL_EXCL; 1482 } 1483 1484 /* 1485 * If the open count is zero, this is a spurious close. 1486 * That indicates a bug in the kernel / DDI framework. 1487 */ 1488 #if defined(illumos) || defined(__NetBSD__) 1489 ASSERT(zv->zv_open_count[otyp] != 0); 1490 #endif 1491 ASSERT(zv->zv_total_opens != 0); 1492 1493 /* 1494 * You may get multiple opens, but only one close. 1495 */ 1496 #if defined(illumos) || defined(__NetBSD__) 1497 zv->zv_open_count[otyp]--; 1498 zv->zv_total_opens--; 1499 #else 1500 zv->zv_total_opens -= count; 1501 #endif 1502 1503 if (zv->zv_total_opens == 0) 1504 zvol_last_close(zv); 1505 1506 #if defined(illumos) || defined(__NetBSD__) 1507 mutex_exit(&zfsdev_state_lock); 1508 #else 1509 if (locked) 1510 mutex_exit(&zfsdev_state_lock); 1511 #endif 1512 return (error); 1513 } 1514 1515 static void 1516 zvol_get_done(zgd_t *zgd, int error) 1517 { 1518 if (zgd->zgd_db) 1519 dmu_buf_rele(zgd->zgd_db, zgd); 1520 1521 zfs_range_unlock(zgd->zgd_rl); 1522 1523 if (error == 0 && zgd->zgd_bp) 1524 zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 1525 1526 kmem_free(zgd, sizeof (zgd_t)); 1527 } 1528 1529 /* 1530 * Get data to generate a TX_WRITE intent log record. 1531 */ 1532 static int 1533 zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 1534 { 1535 zvol_state_t *zv = arg; 1536 objset_t *os = zv->zv_objset; 1537 uint64_t object = ZVOL_OBJ; 1538 uint64_t offset = lr->lr_offset; 1539 uint64_t size = lr->lr_length; /* length of user data */ 1540 blkptr_t *bp = &lr->lr_blkptr; 1541 dmu_buf_t *db; 1542 zgd_t *zgd; 1543 int error; 1544 1545 ASSERT(zio != NULL); 1546 ASSERT(size != 0); 1547 1548 zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 1549 zgd->zgd_zilog = zv->zv_zilog; 1550 zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); 1551 1552 /* 1553 * Write records come in two flavors: immediate and indirect. 1554 * For small writes it's cheaper to store the data with the 1555 * log record (immediate); for large writes it's cheaper to 1556 * sync the data and get a pointer to it (indirect) so that 1557 * we don't have to write the data twice. 1558 */ 1559 if (buf != NULL) { /* immediate write */ 1560 error = dmu_read(os, object, offset, size, buf, 1561 DMU_READ_NO_PREFETCH); 1562 } else { 1563 size = zv->zv_volblocksize; 1564 offset = P2ALIGN(offset, size); 1565 error = dmu_buf_hold(os, object, offset, zgd, &db, 1566 DMU_READ_NO_PREFETCH); 1567 if (error == 0) { 1568 blkptr_t *obp = dmu_buf_get_blkptr(db); 1569 if (obp) { 1570 ASSERT(BP_IS_HOLE(bp)); 1571 *bp = *obp; 1572 } 1573 1574 zgd->zgd_db = db; 1575 zgd->zgd_bp = bp; 1576 1577 ASSERT(db->db_offset == offset); 1578 ASSERT(db->db_size == size); 1579 1580 error = dmu_sync(zio, lr->lr_common.lrc_txg, 1581 zvol_get_done, zgd); 1582 1583 if (error == 0) 1584 return (0); 1585 } 1586 } 1587 1588 zvol_get_done(zgd, error); 1589 1590 return (error); 1591 } 1592 1593 /* 1594 * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 1595 * 1596 * We store data in the log buffers if it's small enough. 1597 * Otherwise we will later flush the data out via dmu_sync(). 1598 */ 1599 ssize_t zvol_immediate_write_sz = 32768; 1600 #ifdef _KERNEL 1601 SYSCTL_LONG(_vfs_zfs_vol, OID_AUTO, immediate_write_sz, CTLFLAG_RWTUN, 1602 &zvol_immediate_write_sz, 0, "Minimal size for indirect log write"); 1603 #endif 1604 1605 static void 1606 zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1607 boolean_t commit) 1608 { 1609 uint32_t blocksize = zv->zv_volblocksize; 1610 zilog_t *zilog = zv->zv_zilog; 1611 itx_wr_state_t write_state; 1612 1613 if (zil_replaying(zilog, tx)) 1614 return; 1615 1616 if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) { 1617 write_state = WR_INDIRECT; 1618 } else if (!spa_has_slogs(zilog->zl_spa) && 1619 resid >= blocksize && blocksize > zvol_immediate_write_sz) { 1620 write_state = WR_INDIRECT; 1621 } else if (commit) { 1622 write_state = WR_COPIED; 1623 } else { 1624 write_state = WR_NEED_COPY; 1625 } 1626 1627 while (resid) { 1628 itx_t *itx; 1629 lr_write_t *lr; 1630 itx_wr_state_t wr_state = write_state; 1631 ssize_t len = resid; 1632 1633 if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) 1634 wr_state = WR_NEED_COPY; 1635 else if (wr_state == WR_INDIRECT) 1636 len = MIN(blocksize - P2PHASE(off, blocksize), resid); 1637 1638 itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1639 (wr_state == WR_COPIED ? len : 0)); 1640 lr = (lr_write_t *)&itx->itx_lr; 1641 if (wr_state == WR_COPIED && dmu_read(zv->zv_objset, 1642 ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1643 zil_itx_destroy(itx); 1644 itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1645 lr = (lr_write_t *)&itx->itx_lr; 1646 wr_state = WR_NEED_COPY; 1647 } 1648 1649 itx->itx_wr_state = wr_state; 1650 lr->lr_foid = ZVOL_OBJ; 1651 lr->lr_offset = off; 1652 lr->lr_length = len; 1653 lr->lr_blkoff = 0; 1654 BP_ZERO(&lr->lr_blkptr); 1655 1656 itx->itx_private = zv; 1657 1658 zil_itx_assign(zilog, itx, tx); 1659 1660 off += len; 1661 resid -= len; 1662 } 1663 } 1664 1665 #ifdef illumos 1666 static int 1667 zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset, 1668 uint64_t size, boolean_t doread, boolean_t isdump) 1669 { 1670 vdev_disk_t *dvd; 1671 int c; 1672 int numerrors = 0; 1673 1674 if (vd->vdev_ops == &vdev_mirror_ops || 1675 vd->vdev_ops == &vdev_replacing_ops || 1676 vd->vdev_ops == &vdev_spare_ops) { 1677 for (c = 0; c < vd->vdev_children; c++) { 1678 int err = zvol_dumpio_vdev(vd->vdev_child[c], 1679 addr, offset, origoffset, size, doread, isdump); 1680 if (err != 0) { 1681 numerrors++; 1682 } else if (doread) { 1683 break; 1684 } 1685 } 1686 } 1687 1688 if (!vd->vdev_ops->vdev_op_leaf && vd->vdev_ops != &vdev_raidz_ops) 1689 return (numerrors < vd->vdev_children ? 0 : EIO); 1690 1691 if (doread && !vdev_readable(vd)) 1692 return (SET_ERROR(EIO)); 1693 else if (!doread && !vdev_writeable(vd)) 1694 return (SET_ERROR(EIO)); 1695 1696 if (vd->vdev_ops == &vdev_raidz_ops) { 1697 return (vdev_raidz_physio(vd, 1698 addr, size, offset, origoffset, doread, isdump)); 1699 } 1700 1701 offset += VDEV_LABEL_START_SIZE; 1702 1703 if (ddi_in_panic() || isdump) { 1704 ASSERT(!doread); 1705 if (doread) 1706 return (SET_ERROR(EIO)); 1707 dvd = vd->vdev_tsd; 1708 ASSERT3P(dvd, !=, NULL); 1709 return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1710 lbtodb(size))); 1711 } else { 1712 dvd = vd->vdev_tsd; 1713 ASSERT3P(dvd, !=, NULL); 1714 return (vdev_disk_ldi_physio(dvd->vd_lh, addr, size, 1715 offset, doread ? B_READ : B_WRITE)); 1716 } 1717 } 1718 1719 static int 1720 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1721 boolean_t doread, boolean_t isdump) 1722 { 1723 vdev_t *vd; 1724 int error; 1725 zvol_extent_t *ze; 1726 spa_t *spa = dmu_objset_spa(zv->zv_objset); 1727 1728 /* Must be sector aligned, and not stradle a block boundary. */ 1729 if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 1730 P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1731 return (SET_ERROR(EINVAL)); 1732 } 1733 ASSERT(size <= zv->zv_volblocksize); 1734 1735 /* Locate the extent this belongs to */ 1736 ze = list_head(&zv->zv_extents); 1737 while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 1738 offset -= ze->ze_nblks * zv->zv_volblocksize; 1739 ze = list_next(&zv->zv_extents, ze); 1740 } 1741 1742 if (ze == NULL) 1743 return (SET_ERROR(EINVAL)); 1744 1745 if (!ddi_in_panic()) 1746 spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 1747 1748 vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 1749 offset += DVA_GET_OFFSET(&ze->ze_dva); 1750 error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva), 1751 size, doread, isdump); 1752 1753 if (!ddi_in_panic()) 1754 spa_config_exit(spa, SCL_STATE, FTAG); 1755 1756 return (error); 1757 } 1758 #else /* !illumos */ 1759 static inline int 1760 zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 1761 boolean_t doread, boolean_t isdump) 1762 { 1763 return 0; 1764 } 1765 #endif /* illumos */ 1766 1767 #ifdef illumos 1768 int 1769 zvol_strategy(buf_t *bp) 1770 #endif 1771 #ifdef __FreeBSD__ 1772 void 1773 zvol_strategy(struct bio *bp) 1774 #endif 1775 #ifdef __NetBSD__ 1776 void 1777 zvol_strategy(buf_t *bp) 1778 #endif 1779 { 1780 zvol_state_t *zv; 1781 uint64_t off, volsize; 1782 size_t resid; 1783 char *addr; 1784 objset_t *os; 1785 rl_t *rl; 1786 int error = 0; 1787 #if defined(illumos) || defined(__NetBSD__) 1788 boolean_t doread = bp->b_flags & B_READ; 1789 #else 1790 boolean_t doread = 0; 1791 #endif 1792 boolean_t is_dumpified; 1793 boolean_t commit; 1794 1795 #ifdef illumos 1796 zfs_soft_state_t *zs = NULL; 1797 1798 if (getminor(bp->b_edev) == 0) { 1799 error = SET_ERROR(EINVAL); 1800 } else { 1801 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1802 if (zs == NULL) 1803 error = SET_ERROR(ENXIO); 1804 else if (zs->zss_type != ZSST_ZVOL) 1805 error = SET_ERROR(EINVAL); 1806 } 1807 1808 if (error) { 1809 bioerror(bp, error); 1810 biodone(bp); 1811 return (0); 1812 } 1813 1814 zv = zs->zss_data; 1815 1816 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1817 bioerror(bp, EROFS); 1818 biodone(bp); 1819 return (0); 1820 } 1821 1822 off = ldbtob(bp->b_blkno); 1823 #endif /* illumos */ 1824 #ifdef __FreeBSD__ 1825 if (bp->bio_to) 1826 zv = bp->bio_to->private; 1827 else 1828 zv = bp->bio_dev->si_drv2; 1829 1830 if (zv == NULL) { 1831 error = SET_ERROR(ENXIO); 1832 goto out; 1833 } 1834 1835 if (bp->bio_cmd != BIO_READ && (zv->zv_flags & ZVOL_RDONLY)) { 1836 error = SET_ERROR(EROFS); 1837 goto out; 1838 } 1839 1840 switch (bp->bio_cmd) { 1841 case BIO_FLUSH: 1842 goto sync; 1843 case BIO_READ: 1844 doread = 1; 1845 case BIO_WRITE: 1846 case BIO_DELETE: 1847 break; 1848 default: 1849 error = EOPNOTSUPP; 1850 goto out; 1851 } 1852 1853 off = bp->bio_offset; 1854 #endif /* __FreeBSD__ */ 1855 #ifdef __NetBSD__ 1856 zfs_soft_state_t *zs = NULL; 1857 1858 if (getminor(bp->b_edev) == 0) { 1859 error = SET_ERROR(EINVAL); 1860 } else { 1861 zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1862 if (zs == NULL) 1863 error = SET_ERROR(ENXIO); 1864 else if (zs->zss_type != ZSST_ZVOL) 1865 error = SET_ERROR(EINVAL); 1866 } 1867 1868 if (error) { 1869 bioerror(bp, error); 1870 biodone(bp); 1871 return; 1872 } 1873 1874 zv = zs->zss_data; 1875 1876 if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1877 bioerror(bp, EROFS); 1878 biodone(bp); 1879 return; 1880 } 1881 off = (uint64_t)bp->b_blkno * DEV_BSIZE; 1882 #endif 1883 1884 volsize = zv->zv_volsize; 1885 1886 os = zv->zv_objset; 1887 ASSERT(os != NULL); 1888 1889 #ifdef illumos 1890 bp_mapin(bp); 1891 addr = bp->b_un.b_addr; 1892 resid = bp->b_bcount; 1893 1894 if (resid > 0 && (off < 0 || off >= volsize)) { 1895 bioerror(bp, EIO); 1896 biodone(bp); 1897 return (0); 1898 } 1899 1900 is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED; 1901 sync = ((!(bp->b_flags & B_ASYNC) && 1902 !(zv->zv_flags & ZVOL_WCE)) || 1903 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1904 !doread && !is_dumpified; 1905 #endif /* illumos */ 1906 #ifdef __FreeBSD__ 1907 addr = bp->bio_data; 1908 resid = bp->bio_length; 1909 1910 if (resid > 0 && (off < 0 || off >= volsize)) { 1911 error = SET_ERROR(EIO); 1912 goto out; 1913 } 1914 1915 is_dumpified = B_FALSE; 1916 sync = !doread && !is_dumpified && 1917 zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS; 1918 #endif /* __FreeBSD__ */ 1919 #ifdef __NetBSD__ 1920 addr = bp->b_data; 1921 resid = bp->b_bcount; 1922 1923 if (resid > 0 && off >= volsize) { 1924 bioerror(bp, EIO); 1925 biodone(bp); 1926 return; 1927 } 1928 1929 is_dumpified = B_FALSE; 1930 commit = ((!(bp->b_flags & B_ASYNC) && 1931 !(zv->zv_flags & ZVOL_WCE)) || 1932 zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) && 1933 !doread && !is_dumpified; 1934 1935 mutex_enter(&zv->zv_dklock); 1936 disk_busy(&zv->zv_dk); 1937 mutex_exit(&zv->zv_dklock); 1938 #endif 1939 1940 /* 1941 * There must be no buffer changes when doing a dmu_sync() because 1942 * we can't change the data whilst calculating the checksum. 1943 */ 1944 rl = zfs_range_lock(&zv->zv_znode, off, resid, 1945 doread ? RL_READER : RL_WRITER); 1946 1947 #ifdef __FreeBSD__ 1948 if (bp->bio_cmd == BIO_DELETE) { 1949 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 1950 error = dmu_tx_assign(tx, TXG_WAIT); 1951 if (error != 0) { 1952 dmu_tx_abort(tx); 1953 } else { 1954 zvol_log_truncate(zv, tx, off, resid, sync); 1955 dmu_tx_commit(tx); 1956 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 1957 off, resid); 1958 resid = 0; 1959 } 1960 goto unlock; 1961 } 1962 #endif 1963 while (resid != 0 && off < volsize) { 1964 size_t size = MIN(resid, zvol_maxphys); 1965 if (is_dumpified) { 1966 size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 1967 error = zvol_dumpio(zv, addr, off, size, 1968 doread, B_FALSE); 1969 } else if (doread) { 1970 error = dmu_read(os, ZVOL_OBJ, off, size, addr, 1971 DMU_READ_PREFETCH); 1972 } else { 1973 dmu_tx_t *tx = dmu_tx_create(os); 1974 dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1975 error = dmu_tx_assign(tx, TXG_WAIT); 1976 if (error) { 1977 dmu_tx_abort(tx); 1978 } else { 1979 dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1980 zvol_log_write(zv, tx, off, size, commit); 1981 dmu_tx_commit(tx); 1982 } 1983 } 1984 if (error) { 1985 /* convert checksum errors into IO errors */ 1986 if (error == ECKSUM) 1987 error = SET_ERROR(EIO); 1988 break; 1989 } 1990 off += size; 1991 addr += size; 1992 resid -= size; 1993 } 1994 #ifdef __FreeBSD__ 1995 unlock: 1996 #endif 1997 zfs_range_unlock(rl); 1998 1999 #ifdef illumos 2000 if ((bp->b_resid = resid) == bp->b_bcount) 2001 bioerror(bp, off > volsize ? EINVAL : error); 2002 2003 if (sync) 2004 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2005 biodone(bp); 2006 2007 return (0); 2008 #endif /* illumos */ 2009 #ifdef __FreeBSD__ 2010 bp->bio_completed = bp->bio_length - resid; 2011 if (bp->bio_completed < bp->bio_length && off > volsize) 2012 error = EINVAL; 2013 2014 if (sync) { 2015 sync: 2016 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2017 } 2018 out: 2019 if (bp->bio_to) 2020 g_io_deliver(bp, error); 2021 else 2022 biofinish(bp, NULL, error); 2023 #endif /* __FreeBSD__ */ 2024 #ifdef __NetBSD__ 2025 if ((bp->b_resid = resid) == bp->b_bcount) 2026 bioerror(bp, off > volsize ? EINVAL : error); 2027 2028 if (commit) 2029 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2030 mutex_enter(&zv->zv_dklock); 2031 disk_unbusy(&zv->zv_dk, bp->b_bcount - bp->b_resid, doread); 2032 mutex_exit(&zv->zv_dklock); 2033 biodone(bp); 2034 #endif /* __NetBSD__ */ 2035 } 2036 2037 #if defined(illumos) || defined(__NetBSD__) 2038 /* 2039 * Set the buffer count to the zvol maximum transfer. 2040 * Using our own routine instead of the default minphys() 2041 * means that for larger writes we write bigger buffers on X86 2042 * (128K instead of 56K) and flush the disk write cache less often 2043 * (every zvol_maxphys - currently 1MB) instead of minphys (currently 2044 * 56K on X86 and 128K on sparc). 2045 */ 2046 void 2047 zvol_minphys(struct buf *bp) 2048 { 2049 if (bp->b_bcount > zvol_maxphys) 2050 bp->b_bcount = zvol_maxphys; 2051 } 2052 #endif 2053 2054 #ifdef illumos 2055 int 2056 zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 2057 { 2058 minor_t minor = getminor(dev); 2059 zvol_state_t *zv; 2060 int error = 0; 2061 uint64_t size; 2062 uint64_t boff; 2063 uint64_t resid; 2064 2065 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2066 if (zv == NULL) 2067 return (SET_ERROR(ENXIO)); 2068 2069 if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0) 2070 return (SET_ERROR(EINVAL)); 2071 2072 boff = ldbtob(blkno); 2073 resid = ldbtob(nblocks); 2074 2075 VERIFY3U(boff + resid, <=, zv->zv_volsize); 2076 2077 while (resid) { 2078 size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 2079 error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 2080 if (error) 2081 break; 2082 boff += size; 2083 addr += size; 2084 resid -= size; 2085 } 2086 2087 return (error); 2088 } 2089 #endif 2090 2091 /*ARGSUSED*/ 2092 #if defined(illumos) || defined(__NetBSD__) 2093 int 2094 zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 2095 #endif 2096 #ifdef __FreeBSD__ 2097 int 2098 zvol_read(struct cdev *dev, struct uio *uio, int ioflag) 2099 #endif 2100 { 2101 zvol_state_t *zv; 2102 uint64_t volsize; 2103 rl_t *rl; 2104 int error = 0; 2105 2106 #if defined(illumos) || defined(__NetBSD__) 2107 minor_t minor = getminor(dev); 2108 2109 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2110 if (zv == NULL) 2111 return (SET_ERROR(ENXIO)); 2112 #else 2113 zv = dev->si_drv2; 2114 #endif 2115 2116 volsize = zv->zv_volsize; 2117 /* uio_loffset == volsize isn't an error as its required for EOF processing. */ 2118 if (uio->uio_resid > 0 && 2119 (uio->uio_loffset < 0 || uio->uio_loffset > volsize)) 2120 return (SET_ERROR(EIO)); 2121 2122 #ifdef illumos 2123 if (zv->zv_flags & ZVOL_DUMPIFIED) { 2124 error = physio(zvol_strategy, NULL, dev, B_READ, 2125 zvol_minphys, uio); 2126 return (error); 2127 } 2128 #endif 2129 2130 #ifdef __NetBSD__ 2131 uint64_t resid = uio->uio_resid; 2132 mutex_enter(&zv->zv_dklock); 2133 disk_busy(&zv->zv_dk); 2134 mutex_exit(&zv->zv_dklock); 2135 #endif 2136 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 2137 RL_READER); 2138 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 2139 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 2140 2141 /* don't read past the end */ 2142 if (bytes > volsize - uio->uio_loffset) 2143 bytes = volsize - uio->uio_loffset; 2144 2145 error = dmu_read_uio_dbuf(zv->zv_dbuf, uio, bytes); 2146 if (error) { 2147 /* convert checksum errors into IO errors */ 2148 if (error == ECKSUM) 2149 error = SET_ERROR(EIO); 2150 break; 2151 } 2152 } 2153 zfs_range_unlock(rl); 2154 #ifdef __NetBSD__ 2155 mutex_enter(&zv->zv_dklock); 2156 disk_unbusy(&zv->zv_dk, resid - uio->uio_resid, 1); 2157 mutex_exit(&zv->zv_dklock); 2158 #endif 2159 return (error); 2160 } 2161 2162 /*ARGSUSED*/ 2163 #if defined(illumos) || defined(__NetBSD__) 2164 int 2165 zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 2166 #else 2167 int 2168 zvol_write(struct cdev *dev, struct uio *uio, int ioflag) 2169 #endif 2170 { 2171 zvol_state_t *zv; 2172 uint64_t volsize; 2173 rl_t *rl; 2174 int error = 0; 2175 boolean_t commit; 2176 2177 #if defined(illumos) || defined(__NetBSD__) 2178 minor_t minor = getminor(dev); 2179 2180 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2181 if (zv == NULL) 2182 return (SET_ERROR(ENXIO)); 2183 #else 2184 zv = dev->si_drv2; 2185 #endif 2186 2187 volsize = zv->zv_volsize; 2188 /* uio_loffset == volsize isn't an error as its required for EOF processing. */ 2189 if (uio->uio_resid > 0 && 2190 (uio->uio_loffset < 0 || uio->uio_loffset > volsize)) 2191 return (SET_ERROR(EIO)); 2192 2193 #ifdef illumos 2194 if (zv->zv_flags & ZVOL_DUMPIFIED) { 2195 error = physio(zvol_strategy, NULL, dev, B_WRITE, 2196 zvol_minphys, uio); 2197 return (error); 2198 } 2199 2200 sync = !(zv->zv_flags & ZVOL_WCE) || 2201 #endif 2202 #ifdef __FreeBSD__ 2203 sync = (ioflag & IO_SYNC) || 2204 #endif 2205 #ifdef __NetBSD__ 2206 commit = 1 || 2207 #endif 2208 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 2209 2210 #ifdef __NetBSD__ 2211 uint64_t resid = uio->uio_resid; 2212 mutex_enter(&zv->zv_dklock); 2213 disk_busy(&zv->zv_dk); 2214 mutex_exit(&zv->zv_dklock); 2215 #endif 2216 rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 2217 RL_WRITER); 2218 while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 2219 uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 2220 uint64_t off = uio->uio_loffset; 2221 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 2222 2223 if (bytes > volsize - off) /* don't write past the end */ 2224 bytes = volsize - off; 2225 2226 dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 2227 error = dmu_tx_assign(tx, TXG_WAIT); 2228 if (error) { 2229 dmu_tx_abort(tx); 2230 break; 2231 } 2232 error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx); 2233 if (error == 0) 2234 zvol_log_write(zv, tx, off, bytes, commit); 2235 dmu_tx_commit(tx); 2236 2237 if (error) 2238 break; 2239 } 2240 zfs_range_unlock(rl); 2241 if (commit) 2242 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2243 #ifdef __NetBSD__ 2244 mutex_enter(&zv->zv_dklock); 2245 disk_unbusy(&zv->zv_dk, resid - uio->uio_resid, 0); 2246 mutex_exit(&zv->zv_dklock); 2247 #endif 2248 return (error); 2249 } 2250 2251 #ifdef illumos 2252 int 2253 zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 2254 { 2255 struct uuid uuid = EFI_RESERVED; 2256 efi_gpe_t gpe = { 0 }; 2257 uint32_t crc; 2258 dk_efi_t efi; 2259 int length; 2260 char *ptr; 2261 2262 if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 2263 return (SET_ERROR(EFAULT)); 2264 ptr = (char *)(uintptr_t)efi.dki_data_64; 2265 length = efi.dki_length; 2266 /* 2267 * Some clients may attempt to request a PMBR for the 2268 * zvol. Currently this interface will return EINVAL to 2269 * such requests. These requests could be supported by 2270 * adding a check for lba == 0 and consing up an appropriate 2271 * PMBR. 2272 */ 2273 if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 2274 return (SET_ERROR(EINVAL)); 2275 2276 gpe.efi_gpe_StartingLBA = LE_64(34ULL); 2277 gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 2278 UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 2279 2280 if (efi.dki_lba == 1) { 2281 efi_gpt_t gpt = { 0 }; 2282 2283 gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 2284 gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 2285 gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 2286 gpt.efi_gpt_MyLBA = LE_64(1ULL); 2287 gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 2288 gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 2289 gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 2290 gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 2291 gpt.efi_gpt_SizeOfPartitionEntry = 2292 LE_32(sizeof (efi_gpe_t)); 2293 CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 2294 gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 2295 CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 2296 gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 2297 if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 2298 flag)) 2299 return (SET_ERROR(EFAULT)); 2300 ptr += sizeof (gpt); 2301 length -= sizeof (gpt); 2302 } 2303 if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 2304 length), flag)) 2305 return (SET_ERROR(EFAULT)); 2306 return (0); 2307 } 2308 2309 /* 2310 * BEGIN entry points to allow external callers access to the volume. 2311 */ 2312 /* 2313 * Return the volume parameters needed for access from an external caller. 2314 * These values are invariant as long as the volume is held open. 2315 */ 2316 int 2317 zvol_get_volume_params(minor_t minor, uint64_t *blksize, 2318 uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 2319 void **rl_hdl, void **bonus_hdl) 2320 { 2321 zvol_state_t *zv; 2322 2323 zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 2324 if (zv == NULL) 2325 return (SET_ERROR(ENXIO)); 2326 if (zv->zv_flags & ZVOL_DUMPIFIED) 2327 return (SET_ERROR(ENXIO)); 2328 2329 ASSERT(blksize && max_xfer_len && minor_hdl && 2330 objset_hdl && zil_hdl && rl_hdl && bonus_hdl); 2331 2332 *blksize = zv->zv_volblocksize; 2333 *max_xfer_len = (uint64_t)zvol_maxphys; 2334 *minor_hdl = zv; 2335 *objset_hdl = zv->zv_objset; 2336 *zil_hdl = zv->zv_zilog; 2337 *rl_hdl = &zv->zv_znode; 2338 *bonus_hdl = zv->zv_dbuf; 2339 return (0); 2340 } 2341 2342 /* 2343 * Return the current volume size to an external caller. 2344 * The size can change while the volume is open. 2345 */ 2346 uint64_t 2347 zvol_get_volume_size(void *minor_hdl) 2348 { 2349 zvol_state_t *zv = minor_hdl; 2350 2351 return (zv->zv_volsize); 2352 } 2353 2354 /* 2355 * Return the current WCE setting to an external caller. 2356 * The WCE setting can change while the volume is open. 2357 */ 2358 int 2359 zvol_get_volume_wce(void *minor_hdl) 2360 { 2361 zvol_state_t *zv = minor_hdl; 2362 2363 return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 2364 } 2365 2366 /* 2367 * Entry point for external callers to zvol_log_write 2368 */ 2369 void 2370 zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 2371 boolean_t sync) 2372 { 2373 zvol_state_t *zv = minor_hdl; 2374 2375 zvol_log_write(zv, tx, off, resid, sync); 2376 } 2377 /* 2378 * END entry points to allow external callers access to the volume. 2379 */ 2380 #endif /* illumos */ 2381 2382 #if !defined(__NetBSD__) 2383 /* 2384 * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 2385 */ 2386 static void 2387 zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 2388 boolean_t sync) 2389 { 2390 itx_t *itx; 2391 lr_truncate_t *lr; 2392 zilog_t *zilog = zv->zv_zilog; 2393 2394 if (zil_replaying(zilog, tx)) 2395 return; 2396 2397 itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 2398 lr = (lr_truncate_t *)&itx->itx_lr; 2399 lr->lr_foid = ZVOL_OBJ; 2400 lr->lr_offset = off; 2401 lr->lr_length = len; 2402 2403 itx->itx_sync = (sync || zv->zv_sync_cnt != 0); 2404 zil_itx_assign(zilog, itx, tx); 2405 } 2406 #endif /* !defined(__NetBSD__) */ 2407 2408 #ifdef illumos 2409 /* 2410 * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 2411 * Also a dirtbag dkio ioctl for unmap/free-block functionality. 2412 */ 2413 /*ARGSUSED*/ 2414 int 2415 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 2416 { 2417 zvol_state_t *zv; 2418 struct dk_callback *dkc; 2419 int error = 0; 2420 rl_t *rl; 2421 2422 mutex_enter(&zfsdev_state_lock); 2423 2424 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 2425 2426 if (zv == NULL) { 2427 mutex_exit(&zfsdev_state_lock); 2428 return (SET_ERROR(ENXIO)); 2429 } 2430 ASSERT(zv->zv_total_opens > 0); 2431 2432 switch (cmd) { 2433 2434 case DKIOCINFO: 2435 { 2436 struct dk_cinfo dki; 2437 2438 bzero(&dki, sizeof (dki)); 2439 (void) strcpy(dki.dki_cname, "zvol"); 2440 (void) strcpy(dki.dki_dname, "zvol"); 2441 dki.dki_ctype = DKC_UNKNOWN; 2442 dki.dki_unit = getminor(dev); 2443 dki.dki_maxtransfer = 2444 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs); 2445 mutex_exit(&zfsdev_state_lock); 2446 if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 2447 error = SET_ERROR(EFAULT); 2448 return (error); 2449 } 2450 2451 case DKIOCGMEDIAINFO: 2452 { 2453 struct dk_minfo dkm; 2454 2455 bzero(&dkm, sizeof (dkm)); 2456 dkm.dki_lbsize = 1U << zv->zv_min_bs; 2457 dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 2458 dkm.dki_media_type = DK_UNKNOWN; 2459 mutex_exit(&zfsdev_state_lock); 2460 if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 2461 error = SET_ERROR(EFAULT); 2462 return (error); 2463 } 2464 2465 case DKIOCGMEDIAINFOEXT: 2466 { 2467 struct dk_minfo_ext dkmext; 2468 2469 bzero(&dkmext, sizeof (dkmext)); 2470 dkmext.dki_lbsize = 1U << zv->zv_min_bs; 2471 dkmext.dki_pbsize = zv->zv_volblocksize; 2472 dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 2473 dkmext.dki_media_type = DK_UNKNOWN; 2474 mutex_exit(&zfsdev_state_lock); 2475 if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag)) 2476 error = SET_ERROR(EFAULT); 2477 return (error); 2478 } 2479 2480 case DKIOCGETEFI: 2481 { 2482 uint64_t vs = zv->zv_volsize; 2483 uint8_t bs = zv->zv_min_bs; 2484 2485 mutex_exit(&zfsdev_state_lock); 2486 error = zvol_getefi((void *)arg, flag, vs, bs); 2487 return (error); 2488 } 2489 2490 case DKIOCFLUSHWRITECACHE: 2491 dkc = (struct dk_callback *)arg; 2492 mutex_exit(&zfsdev_state_lock); 2493 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2494 if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 2495 (*dkc->dkc_callback)(dkc->dkc_cookie, error); 2496 error = 0; 2497 } 2498 return (error); 2499 2500 case DKIOCGETWCE: 2501 { 2502 int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 2503 if (ddi_copyout(&wce, (void *)arg, sizeof (int), 2504 flag)) 2505 error = SET_ERROR(EFAULT); 2506 break; 2507 } 2508 case DKIOCSETWCE: 2509 { 2510 int wce; 2511 if (ddi_copyin((void *)arg, &wce, sizeof (int), 2512 flag)) { 2513 error = SET_ERROR(EFAULT); 2514 break; 2515 } 2516 if (wce) { 2517 zv->zv_flags |= ZVOL_WCE; 2518 mutex_exit(&zfsdev_state_lock); 2519 } else { 2520 zv->zv_flags &= ~ZVOL_WCE; 2521 mutex_exit(&zfsdev_state_lock); 2522 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2523 } 2524 return (0); 2525 } 2526 2527 case DKIOCGGEOM: 2528 case DKIOCGVTOC: 2529 /* 2530 * commands using these (like prtvtoc) expect ENOTSUP 2531 * since we're emulating an EFI label 2532 */ 2533 error = SET_ERROR(ENOTSUP); 2534 break; 2535 2536 case DKIOCDUMPINIT: 2537 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 2538 RL_WRITER); 2539 error = zvol_dumpify(zv); 2540 zfs_range_unlock(rl); 2541 break; 2542 2543 case DKIOCDUMPFINI: 2544 if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 2545 break; 2546 rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 2547 RL_WRITER); 2548 error = zvol_dump_fini(zv); 2549 zfs_range_unlock(rl); 2550 break; 2551 2552 case DKIOCFREE: 2553 { 2554 dkioc_free_t df; 2555 dmu_tx_t *tx; 2556 2557 if (!zvol_unmap_enabled) 2558 break; 2559 2560 if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) { 2561 error = SET_ERROR(EFAULT); 2562 break; 2563 } 2564 2565 /* 2566 * Apply Postel's Law to length-checking. If they overshoot, 2567 * just blank out until the end, if there's a need to blank 2568 * out anything. 2569 */ 2570 if (df.df_start >= zv->zv_volsize) 2571 break; /* No need to do anything... */ 2572 2573 mutex_exit(&zfsdev_state_lock); 2574 2575 rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length, 2576 RL_WRITER); 2577 tx = dmu_tx_create(zv->zv_objset); 2578 dmu_tx_mark_netfree(tx); 2579 error = dmu_tx_assign(tx, TXG_WAIT); 2580 if (error != 0) { 2581 dmu_tx_abort(tx); 2582 } else { 2583 zvol_log_truncate(zv, tx, df.df_start, 2584 df.df_length, B_TRUE); 2585 dmu_tx_commit(tx); 2586 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 2587 df.df_start, df.df_length); 2588 } 2589 2590 zfs_range_unlock(rl); 2591 2592 /* 2593 * If the write-cache is disabled, 'sync' property 2594 * is set to 'always', or if the caller is asking for 2595 * a synchronous free, commit this operation to the zil. 2596 * This will sync any previous uncommitted writes to the 2597 * zvol object. 2598 * Can be overridden by the zvol_unmap_sync_enabled tunable. 2599 */ 2600 if ((error == 0) && zvol_unmap_sync_enabled && 2601 (!(zv->zv_flags & ZVOL_WCE) || 2602 (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) || 2603 (df.df_flags & DF_WAIT_SYNC))) { 2604 zil_commit(zv->zv_zilog, ZVOL_OBJ); 2605 } 2606 2607 return (error); 2608 } 2609 2610 default: 2611 error = SET_ERROR(ENOTTY); 2612 break; 2613 2614 } 2615 mutex_exit(&zfsdev_state_lock); 2616 return (error); 2617 } 2618 #endif /* illumos */ 2619 2620 int 2621 zvol_busy(void) 2622 { 2623 return (zvol_minors != 0); 2624 } 2625 2626 void 2627 zvol_init(void) 2628 { 2629 VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 2630 1) == 0); 2631 #ifndef __FreeBSD__ 2632 mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 2633 #endif 2634 ZFS_LOG(1, "ZVOL Initialized."); 2635 } 2636 2637 void 2638 zvol_fini(void) 2639 { 2640 #ifndef __FreeBSD__ 2641 mutex_destroy(&zfsdev_state_lock); 2642 #endif 2643 ddi_soft_state_fini(&zfsdev_state); 2644 ZFS_LOG(1, "ZVOL Deinitialized."); 2645 } 2646 2647 #ifdef illumos 2648 /*ARGSUSED*/ 2649 static int 2650 zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx) 2651 { 2652 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 2653 2654 if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 2655 return (1); 2656 return (0); 2657 } 2658 2659 /*ARGSUSED*/ 2660 static void 2661 zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx) 2662 { 2663 spa_t *spa = dmu_tx_pool(tx)->dp_spa; 2664 2665 spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx); 2666 } 2667 2668 static int 2669 zvol_dump_init(zvol_state_t *zv, boolean_t resize) 2670 { 2671 dmu_tx_t *tx; 2672 int error; 2673 objset_t *os = zv->zv_objset; 2674 spa_t *spa = dmu_objset_spa(os); 2675 vdev_t *vd = spa->spa_root_vdev; 2676 nvlist_t *nv = NULL; 2677 uint64_t version = spa_version(spa); 2678 uint64_t checksum, compress, refresrv, vbs, dedup; 2679 2680 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 2681 ASSERT(vd->vdev_ops == &vdev_root_ops); 2682 2683 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 2684 DMU_OBJECT_END); 2685 if (error != 0) 2686 return (error); 2687 /* wait for dmu_free_long_range to actually free the blocks */ 2688 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2689 2690 /* 2691 * If the pool on which the dump device is being initialized has more 2692 * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is 2693 * enabled. If so, bump that feature's counter to indicate that the 2694 * feature is active. We also check the vdev type to handle the 2695 * following case: 2696 * # zpool create test raidz disk1 disk2 disk3 2697 * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev), 2698 * the raidz vdev itself has 3 children. 2699 */ 2700 if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) { 2701 if (!spa_feature_is_enabled(spa, 2702 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 2703 return (SET_ERROR(ENOTSUP)); 2704 (void) dsl_sync_task(spa_name(spa), 2705 zfs_mvdev_dump_feature_check, 2706 zfs_mvdev_dump_activate_feature_sync, NULL, 2707 2, ZFS_SPACE_CHECK_RESERVED); 2708 } 2709 2710 if (!resize) { 2711 error = dsl_prop_get_integer(zv->zv_name, 2712 zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 2713 if (error == 0) { 2714 error = dsl_prop_get_integer(zv->zv_name, 2715 zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, 2716 NULL); 2717 } 2718 if (error == 0) { 2719 error = dsl_prop_get_integer(zv->zv_name, 2720 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 2721 &refresrv, NULL); 2722 } 2723 if (error == 0) { 2724 error = dsl_prop_get_integer(zv->zv_name, 2725 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, 2726 NULL); 2727 } 2728 if (version >= SPA_VERSION_DEDUP && error == 0) { 2729 error = dsl_prop_get_integer(zv->zv_name, 2730 zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 2731 } 2732 } 2733 if (error != 0) 2734 return (error); 2735 2736 tx = dmu_tx_create(os); 2737 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2738 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2739 error = dmu_tx_assign(tx, TXG_WAIT); 2740 if (error != 0) { 2741 dmu_tx_abort(tx); 2742 return (error); 2743 } 2744 2745 /* 2746 * If we are resizing the dump device then we only need to 2747 * update the refreservation to match the newly updated 2748 * zvolsize. Otherwise, we save off the original state of the 2749 * zvol so that we can restore them if the zvol is ever undumpified. 2750 */ 2751 if (resize) { 2752 error = zap_update(os, ZVOL_ZAP_OBJ, 2753 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2754 &zv->zv_volsize, tx); 2755 } else { 2756 error = zap_update(os, ZVOL_ZAP_OBJ, 2757 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 2758 &compress, tx); 2759 if (error == 0) { 2760 error = zap_update(os, ZVOL_ZAP_OBJ, 2761 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, 2762 &checksum, tx); 2763 } 2764 if (error == 0) { 2765 error = zap_update(os, ZVOL_ZAP_OBJ, 2766 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2767 &refresrv, tx); 2768 } 2769 if (error == 0) { 2770 error = zap_update(os, ZVOL_ZAP_OBJ, 2771 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 2772 &vbs, tx); 2773 } 2774 if (error == 0) { 2775 error = dmu_object_set_blocksize( 2776 os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx); 2777 } 2778 if (version >= SPA_VERSION_DEDUP && error == 0) { 2779 error = zap_update(os, ZVOL_ZAP_OBJ, 2780 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 2781 &dedup, tx); 2782 } 2783 if (error == 0) 2784 zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE; 2785 } 2786 dmu_tx_commit(tx); 2787 2788 /* 2789 * We only need update the zvol's property if we are initializing 2790 * the dump area for the first time. 2791 */ 2792 if (error == 0 && !resize) { 2793 /* 2794 * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum 2795 * function. Otherwise, use the old default -- OFF. 2796 */ 2797 checksum = spa_feature_is_active(spa, 2798 SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY : 2799 ZIO_CHECKSUM_OFF; 2800 2801 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2802 VERIFY(nvlist_add_uint64(nv, 2803 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 2804 VERIFY(nvlist_add_uint64(nv, 2805 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 2806 ZIO_COMPRESS_OFF) == 0); 2807 VERIFY(nvlist_add_uint64(nv, 2808 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 2809 checksum) == 0); 2810 if (version >= SPA_VERSION_DEDUP) { 2811 VERIFY(nvlist_add_uint64(nv, 2812 zfs_prop_to_name(ZFS_PROP_DEDUP), 2813 ZIO_CHECKSUM_OFF) == 0); 2814 } 2815 2816 error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2817 nv, NULL); 2818 nvlist_free(nv); 2819 } 2820 2821 /* Allocate the space for the dump */ 2822 if (error == 0) 2823 error = zvol_prealloc(zv); 2824 return (error); 2825 } 2826 2827 static int 2828 zvol_dumpify(zvol_state_t *zv) 2829 { 2830 int error = 0; 2831 uint64_t dumpsize = 0; 2832 dmu_tx_t *tx; 2833 objset_t *os = zv->zv_objset; 2834 2835 if (zv->zv_flags & ZVOL_RDONLY) 2836 return (SET_ERROR(EROFS)); 2837 2838 if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 2839 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 2840 boolean_t resize = (dumpsize > 0); 2841 2842 if ((error = zvol_dump_init(zv, resize)) != 0) { 2843 (void) zvol_dump_fini(zv); 2844 return (error); 2845 } 2846 } 2847 2848 /* 2849 * Build up our lba mapping. 2850 */ 2851 error = zvol_get_lbas(zv); 2852 if (error) { 2853 (void) zvol_dump_fini(zv); 2854 return (error); 2855 } 2856 2857 tx = dmu_tx_create(os); 2858 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2859 error = dmu_tx_assign(tx, TXG_WAIT); 2860 if (error) { 2861 dmu_tx_abort(tx); 2862 (void) zvol_dump_fini(zv); 2863 return (error); 2864 } 2865 2866 zv->zv_flags |= ZVOL_DUMPIFIED; 2867 error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 2868 &zv->zv_volsize, tx); 2869 dmu_tx_commit(tx); 2870 2871 if (error) { 2872 (void) zvol_dump_fini(zv); 2873 return (error); 2874 } 2875 2876 txg_wait_synced(dmu_objset_pool(os), 0); 2877 return (0); 2878 } 2879 2880 static int 2881 zvol_dump_fini(zvol_state_t *zv) 2882 { 2883 dmu_tx_t *tx; 2884 objset_t *os = zv->zv_objset; 2885 nvlist_t *nv; 2886 int error = 0; 2887 uint64_t checksum, compress, refresrv, vbs, dedup; 2888 uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 2889 2890 /* 2891 * Attempt to restore the zvol back to its pre-dumpified state. 2892 * This is a best-effort attempt as it's possible that not all 2893 * of these properties were initialized during the dumpify process 2894 * (i.e. error during zvol_dump_init). 2895 */ 2896 2897 tx = dmu_tx_create(os); 2898 dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2899 error = dmu_tx_assign(tx, TXG_WAIT); 2900 if (error) { 2901 dmu_tx_abort(tx); 2902 return (error); 2903 } 2904 (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 2905 dmu_tx_commit(tx); 2906 2907 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2908 zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 2909 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2910 zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 2911 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2912 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 2913 (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2914 zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 2915 2916 VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2917 (void) nvlist_add_uint64(nv, 2918 zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 2919 (void) nvlist_add_uint64(nv, 2920 zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 2921 (void) nvlist_add_uint64(nv, 2922 zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 2923 if (version >= SPA_VERSION_DEDUP && 2924 zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2925 zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 2926 (void) nvlist_add_uint64(nv, 2927 zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 2928 } 2929 (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 2930 nv, NULL); 2931 nvlist_free(nv); 2932 2933 zvol_free_extents(zv); 2934 zv->zv_flags &= ~ZVOL_DUMPIFIED; 2935 (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2936 /* wait for dmu_free_long_range to actually free the blocks */ 2937 txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2938 tx = dmu_tx_create(os); 2939 dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2940 error = dmu_tx_assign(tx, TXG_WAIT); 2941 if (error) { 2942 dmu_tx_abort(tx); 2943 return (error); 2944 } 2945 if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2946 zv->zv_volblocksize = vbs; 2947 dmu_tx_commit(tx); 2948 2949 return (0); 2950 } 2951 #endif /* illumos */ 2952 2953 #ifdef __FreeBSD__ 2954 static void 2955 zvol_geom_run(zvol_state_t *zv) 2956 { 2957 struct g_provider *pp; 2958 2959 pp = zv->zv_provider; 2960 g_error_provider(pp, 0); 2961 2962 kproc_kthread_add(zvol_geom_worker, zv, &zfsproc, NULL, 0, 0, 2963 "zfskern", "zvol %s", pp->name + sizeof(ZVOL_DRIVER)); 2964 } 2965 2966 static void 2967 zvol_geom_destroy(zvol_state_t *zv) 2968 { 2969 struct g_provider *pp; 2970 2971 g_topology_assert(); 2972 2973 mtx_lock(&zv->zv_queue_mtx); 2974 zv->zv_state = 1; 2975 wakeup_one(&zv->zv_queue); 2976 while (zv->zv_state != 2) 2977 msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0); 2978 mtx_destroy(&zv->zv_queue_mtx); 2979 2980 pp = zv->zv_provider; 2981 zv->zv_provider = NULL; 2982 pp->private = NULL; 2983 g_wither_geom(pp->geom, ENXIO); 2984 } 2985 2986 static int 2987 zvol_geom_access(struct g_provider *pp, int acr, int acw, int ace) 2988 { 2989 int count, error, flags; 2990 2991 g_topology_assert(); 2992 2993 /* 2994 * To make it easier we expect either open or close, but not both 2995 * at the same time. 2996 */ 2997 KASSERT((acr >= 0 && acw >= 0 && ace >= 0) || 2998 (acr <= 0 && acw <= 0 && ace <= 0), 2999 ("Unsupported access request to %s (acr=%d, acw=%d, ace=%d).", 3000 pp->name, acr, acw, ace)); 3001 3002 if (pp->private == NULL) { 3003 if (acr <= 0 && acw <= 0 && ace <= 0) 3004 return (0); 3005 return (pp->error); 3006 } 3007 3008 /* 3009 * We don't pass FEXCL flag to zvol_open()/zvol_close() if ace != 0, 3010 * because GEOM already handles that and handles it a bit differently. 3011 * GEOM allows for multiple read/exclusive consumers and ZFS allows 3012 * only one exclusive consumer, no matter if it is reader or writer. 3013 * I like better the way GEOM works so I'll leave it for GEOM to 3014 * decide what to do. 3015 */ 3016 3017 count = acr + acw + ace; 3018 if (count == 0) 3019 return (0); 3020 3021 flags = 0; 3022 if (acr != 0 || ace != 0) 3023 flags |= FREAD; 3024 if (acw != 0) 3025 flags |= FWRITE; 3026 3027 g_topology_unlock(); 3028 if (count > 0) 3029 error = zvol_open(pp, flags, count); 3030 else 3031 error = zvol_close(pp, flags, -count); 3032 g_topology_lock(); 3033 return (error); 3034 } 3035 3036 static void 3037 zvol_geom_start(struct bio *bp) 3038 { 3039 zvol_state_t *zv; 3040 boolean_t first; 3041 3042 zv = bp->bio_to->private; 3043 ASSERT(zv != NULL); 3044 switch (bp->bio_cmd) { 3045 case BIO_FLUSH: 3046 if (!THREAD_CAN_SLEEP()) 3047 goto enqueue; 3048 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3049 g_io_deliver(bp, 0); 3050 break; 3051 case BIO_READ: 3052 case BIO_WRITE: 3053 case BIO_DELETE: 3054 if (!THREAD_CAN_SLEEP()) 3055 goto enqueue; 3056 zvol_strategy(bp); 3057 break; 3058 case BIO_GETATTR: { 3059 spa_t *spa = dmu_objset_spa(zv->zv_objset); 3060 uint64_t refd, avail, usedobjs, availobjs, val; 3061 3062 if (g_handleattr_int(bp, "GEOM::candelete", 1)) 3063 return; 3064 if (strcmp(bp->bio_attribute, "blocksavail") == 0) { 3065 dmu_objset_space(zv->zv_objset, &refd, &avail, 3066 &usedobjs, &availobjs); 3067 if (g_handleattr_off_t(bp, "blocksavail", 3068 avail / DEV_BSIZE)) 3069 return; 3070 } else if (strcmp(bp->bio_attribute, "blocksused") == 0) { 3071 dmu_objset_space(zv->zv_objset, &refd, &avail, 3072 &usedobjs, &availobjs); 3073 if (g_handleattr_off_t(bp, "blocksused", 3074 refd / DEV_BSIZE)) 3075 return; 3076 } else if (strcmp(bp->bio_attribute, "poolblocksavail") == 0) { 3077 avail = metaslab_class_get_space(spa_normal_class(spa)); 3078 avail -= metaslab_class_get_alloc(spa_normal_class(spa)); 3079 if (g_handleattr_off_t(bp, "poolblocksavail", 3080 avail / DEV_BSIZE)) 3081 return; 3082 } else if (strcmp(bp->bio_attribute, "poolblocksused") == 0) { 3083 refd = metaslab_class_get_alloc(spa_normal_class(spa)); 3084 if (g_handleattr_off_t(bp, "poolblocksused", 3085 refd / DEV_BSIZE)) 3086 return; 3087 } 3088 /* FALLTHROUGH */ 3089 } 3090 default: 3091 g_io_deliver(bp, EOPNOTSUPP); 3092 break; 3093 } 3094 return; 3095 3096 enqueue: 3097 mtx_lock(&zv->zv_queue_mtx); 3098 first = (bioq_first(&zv->zv_queue) == NULL); 3099 bioq_insert_tail(&zv->zv_queue, bp); 3100 mtx_unlock(&zv->zv_queue_mtx); 3101 if (first) 3102 wakeup_one(&zv->zv_queue); 3103 } 3104 3105 static void 3106 zvol_geom_worker(void *arg) 3107 { 3108 zvol_state_t *zv; 3109 struct bio *bp; 3110 3111 thread_lock(curthread); 3112 sched_prio(curthread, PRIBIO); 3113 thread_unlock(curthread); 3114 3115 zv = arg; 3116 for (;;) { 3117 mtx_lock(&zv->zv_queue_mtx); 3118 bp = bioq_takefirst(&zv->zv_queue); 3119 if (bp == NULL) { 3120 if (zv->zv_state == 1) { 3121 zv->zv_state = 2; 3122 wakeup(&zv->zv_state); 3123 mtx_unlock(&zv->zv_queue_mtx); 3124 kthread_exit(); 3125 } 3126 msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP, 3127 "zvol:io", 0); 3128 continue; 3129 } 3130 mtx_unlock(&zv->zv_queue_mtx); 3131 switch (bp->bio_cmd) { 3132 case BIO_FLUSH: 3133 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3134 g_io_deliver(bp, 0); 3135 break; 3136 case BIO_READ: 3137 case BIO_WRITE: 3138 case BIO_DELETE: 3139 zvol_strategy(bp); 3140 break; 3141 default: 3142 g_io_deliver(bp, EOPNOTSUPP); 3143 break; 3144 } 3145 } 3146 } 3147 #endif 3148 3149 extern boolean_t dataset_name_hidden(const char *name); 3150 3151 static int 3152 zvol_create_snapshots(objset_t *os, const char *name) 3153 { 3154 uint64_t cookie, obj; 3155 char *sname; 3156 int error, len; 3157 3158 cookie = obj = 0; 3159 sname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 3160 3161 #if 0 3162 (void) dmu_objset_find(name, dmu_objset_prefetch, NULL, 3163 DS_FIND_SNAPSHOTS); 3164 #endif 3165 3166 for (;;) { 3167 len = snprintf(sname, MAXPATHLEN, "%s@", name); 3168 if (len >= MAXPATHLEN) { 3169 dmu_objset_rele(os, FTAG); 3170 error = ENAMETOOLONG; 3171 break; 3172 } 3173 3174 dsl_pool_config_enter(dmu_objset_pool(os), FTAG); 3175 error = dmu_snapshot_list_next(os, MAXPATHLEN - len, 3176 sname + len, &obj, &cookie, NULL); 3177 dsl_pool_config_exit(dmu_objset_pool(os), FTAG); 3178 if (error != 0) { 3179 if (error == ENOENT) 3180 error = 0; 3181 break; 3182 } 3183 3184 error = zvol_create_minor(sname); 3185 if (error != 0 && error != EEXIST) { 3186 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n", 3187 sname, error); 3188 break; 3189 } 3190 } 3191 3192 kmem_free(sname, MAXPATHLEN); 3193 return (error); 3194 } 3195 3196 int 3197 zvol_create_minors(const char *name) 3198 { 3199 uint64_t cookie; 3200 objset_t *os; 3201 char *osname, *p; 3202 int error, len; 3203 3204 if (dataset_name_hidden(name)) 3205 return (0); 3206 3207 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 3208 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n", 3209 name, error); 3210 return (error); 3211 } 3212 if (dmu_objset_type(os) == DMU_OST_ZVOL) { 3213 dsl_dataset_long_hold(os->os_dsl_dataset, FTAG); 3214 dsl_pool_rele(dmu_objset_pool(os), FTAG); 3215 error = zvol_create_minor(name); 3216 if (error == 0 || error == EEXIST) { 3217 error = zvol_create_snapshots(os, name); 3218 } else { 3219 printf("ZFS WARNING: Unable to create ZVOL %s (error=%d).\n", 3220 name, error); 3221 } 3222 dsl_dataset_long_rele(os->os_dsl_dataset, FTAG); 3223 dsl_dataset_rele(os->os_dsl_dataset, FTAG); 3224 return (error); 3225 } 3226 if (dmu_objset_type(os) != DMU_OST_ZFS) { 3227 dmu_objset_rele(os, FTAG); 3228 return (0); 3229 } 3230 3231 osname = kmem_alloc(MAXPATHLEN, KM_SLEEP); 3232 if (snprintf(osname, MAXPATHLEN, "%s/", name) >= MAXPATHLEN) { 3233 dmu_objset_rele(os, FTAG); 3234 kmem_free(osname, MAXPATHLEN); 3235 return (ENOENT); 3236 } 3237 p = osname + strlen(osname); 3238 len = MAXPATHLEN - (p - osname); 3239 3240 #if 0 3241 /* Prefetch the datasets. */ 3242 cookie = 0; 3243 while (dmu_dir_list_next(os, len, p, NULL, &cookie) == 0) { 3244 if (!dataset_name_hidden(osname)) 3245 (void) dmu_objset_prefetch(osname, NULL); 3246 } 3247 #endif 3248 3249 cookie = 0; 3250 while (dmu_dir_list_next(os, MAXPATHLEN - (p - osname), p, NULL, 3251 &cookie) == 0) { 3252 dmu_objset_rele(os, FTAG); 3253 (void)zvol_create_minors(osname); 3254 if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 3255 printf("ZFS WARNING: Unable to put hold on %s (error=%d).\n", 3256 name, error); 3257 return (error); 3258 } 3259 } 3260 3261 dmu_objset_rele(os, FTAG); 3262 kmem_free(osname, MAXPATHLEN); 3263 return (0); 3264 } 3265 3266 #ifdef __NetBSD__ 3267 void 3268 zvol_rename_minor(zvol_state_t *zv, const char *newname) 3269 { 3270 char *nm; 3271 minor_t minor = zv->zv_minor; 3272 3273 nm = PNBUF_GET(); 3274 strlcpy(nm, newname, MAXPATHLEN); 3275 ddi_remove_minor_node(zfs_dip, zv->zv_name); 3276 (void)ddi_create_minor_node(zfs_dip, nm, S_IFCHR, minor, DDI_PSEUDO, 0); 3277 (void)ddi_create_minor_node(zfs_dip, nm, S_IFBLK, minor, DDI_PSEUDO, 0); 3278 PNBUF_PUT(nm); 3279 3280 strlcpy(zv->zv_name, newname, sizeof(zv->zv_name)); 3281 mutex_enter(&zv->zv_dklock); 3282 disk_rename(&zv->zv_dk, zv->zv_name); 3283 mutex_exit(&zv->zv_dklock); 3284 } 3285 #endif 3286 3287 #ifdef __FreeBSD__ 3288 static void 3289 zvol_rename_minor(zvol_state_t *zv, const char *newname) 3290 { 3291 struct g_geom *gp; 3292 struct g_provider *pp; 3293 struct cdev *dev; 3294 3295 ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 3296 3297 if (zv->zv_volmode == ZFS_VOLMODE_GEOM) { 3298 g_topology_lock(); 3299 pp = zv->zv_provider; 3300 ASSERT(pp != NULL); 3301 gp = pp->geom; 3302 ASSERT(gp != NULL); 3303 3304 zv->zv_provider = NULL; 3305 g_wither_provider(pp, ENXIO); 3306 3307 pp = g_new_providerf(gp, "%s/%s", ZVOL_DRIVER, newname); 3308 pp->flags |= G_PF_DIRECT_RECEIVE | G_PF_DIRECT_SEND; 3309 pp->sectorsize = DEV_BSIZE; 3310 pp->mediasize = zv->zv_volsize; 3311 pp->private = zv; 3312 zv->zv_provider = pp; 3313 g_error_provider(pp, 0); 3314 g_topology_unlock(); 3315 } else if (zv->zv_volmode == ZFS_VOLMODE_DEV) { 3316 struct make_dev_args args; 3317 3318 if ((dev = zv->zv_dev) != NULL) { 3319 zv->zv_dev = NULL; 3320 destroy_dev(dev); 3321 if (zv->zv_total_opens > 0) { 3322 zv->zv_flags &= ~ZVOL_EXCL; 3323 zv->zv_total_opens = 0; 3324 zvol_last_close(zv); 3325 } 3326 } 3327 3328 make_dev_args_init(&args); 3329 args.mda_flags = MAKEDEV_CHECKNAME | MAKEDEV_WAITOK; 3330 args.mda_devsw = &zvol_cdevsw; 3331 args.mda_cr = NULL; 3332 args.mda_uid = UID_ROOT; 3333 args.mda_gid = GID_OPERATOR; 3334 args.mda_mode = 0640; 3335 args.mda_si_drv2 = zv; 3336 if (make_dev_s(&args, &zv->zv_dev, 3337 "%s/%s", ZVOL_DRIVER, newname) == 0) 3338 zv->zv_dev->si_iosize_max = MAXPHYS; 3339 } 3340 strlcpy(zv->zv_name, newname, sizeof(zv->zv_name)); 3341 } 3342 #endif 3343 3344 void 3345 zvol_rename_minors(const char *oldname, const char *newname) 3346 { 3347 char name[MAXPATHLEN]; 3348 struct g_provider *pp; 3349 struct g_geom *gp; 3350 size_t oldnamelen, newnamelen; 3351 zvol_state_t *zv; 3352 char *namebuf; 3353 boolean_t locked = B_FALSE; 3354 3355 oldnamelen = strlen(oldname); 3356 newnamelen = strlen(newname); 3357 3358 DROP_GIANT(); 3359 /* See comment in zvol_open(). */ 3360 if (!MUTEX_HELD(&zfsdev_state_lock)) { 3361 mutex_enter(&zfsdev_state_lock); 3362 locked = B_TRUE; 3363 } 3364 3365 LIST_FOREACH(zv, &all_zvols, zv_links) { 3366 if (strcmp(zv->zv_name, oldname) == 0) { 3367 zvol_rename_minor(zv, newname); 3368 } else if (strncmp(zv->zv_name, oldname, oldnamelen) == 0 && 3369 (zv->zv_name[oldnamelen] == '/' || 3370 zv->zv_name[oldnamelen] == '@')) { 3371 snprintf(name, sizeof(name), "%s%c%s", newname, 3372 zv->zv_name[oldnamelen], 3373 zv->zv_name + oldnamelen + 1); 3374 zvol_rename_minor(zv, name); 3375 } 3376 } 3377 3378 if (locked) 3379 mutex_exit(&zfsdev_state_lock); 3380 PICKUP_GIANT(); 3381 } 3382 3383 #ifdef __FreeBSD__ 3384 static int 3385 zvol_d_open(struct cdev *dev, int flags, int fmt, struct thread *td) 3386 { 3387 zvol_state_t *zv = dev->si_drv2; 3388 int err = 0; 3389 3390 mutex_enter(&zfsdev_state_lock); 3391 if (zv->zv_total_opens == 0) 3392 err = zvol_first_open(zv); 3393 if (err) { 3394 mutex_exit(&zfsdev_state_lock); 3395 return (err); 3396 } 3397 if ((flags & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 3398 err = SET_ERROR(EROFS); 3399 goto out; 3400 } 3401 if (zv->zv_flags & ZVOL_EXCL) { 3402 err = SET_ERROR(EBUSY); 3403 goto out; 3404 } 3405 #ifdef FEXCL 3406 if (flags & FEXCL) { 3407 if (zv->zv_total_opens != 0) { 3408 err = SET_ERROR(EBUSY); 3409 goto out; 3410 } 3411 zv->zv_flags |= ZVOL_EXCL; 3412 } 3413 #endif 3414 3415 zv->zv_total_opens++; 3416 if (flags & (FSYNC | FDSYNC)) { 3417 zv->zv_sync_cnt++; 3418 if (zv->zv_sync_cnt == 1) 3419 zil_async_to_sync(zv->zv_zilog, ZVOL_OBJ); 3420 } 3421 mutex_exit(&zfsdev_state_lock); 3422 return (err); 3423 out: 3424 if (zv->zv_total_opens == 0) 3425 zvol_last_close(zv); 3426 mutex_exit(&zfsdev_state_lock); 3427 return (err); 3428 } 3429 3430 static int 3431 zvol_d_close(struct cdev *dev, int flags, int fmt, struct thread *td) 3432 { 3433 zvol_state_t *zv = dev->si_drv2; 3434 3435 mutex_enter(&zfsdev_state_lock); 3436 if (zv->zv_flags & ZVOL_EXCL) { 3437 ASSERT(zv->zv_total_opens == 1); 3438 zv->zv_flags &= ~ZVOL_EXCL; 3439 } 3440 3441 /* 3442 * If the open count is zero, this is a spurious close. 3443 * That indicates a bug in the kernel / DDI framework. 3444 */ 3445 ASSERT(zv->zv_total_opens != 0); 3446 3447 /* 3448 * You may get multiple opens, but only one close. 3449 */ 3450 zv->zv_total_opens--; 3451 if (flags & (FSYNC | FDSYNC)) 3452 zv->zv_sync_cnt--; 3453 3454 if (zv->zv_total_opens == 0) 3455 zvol_last_close(zv); 3456 3457 mutex_exit(&zfsdev_state_lock); 3458 return (0); 3459 } 3460 3461 static int 3462 zvol_d_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag, struct thread *td) 3463 { 3464 zvol_state_t *zv; 3465 rl_t *rl; 3466 off_t offset, length; 3467 int i, error; 3468 boolean_t sync; 3469 3470 zv = dev->si_drv2; 3471 3472 error = 0; 3473 KASSERT(zv->zv_total_opens > 0, 3474 ("Device with zero access count in zvol_d_ioctl")); 3475 3476 i = IOCPARM_LEN(cmd); 3477 switch (cmd) { 3478 case DIOCGSECTORSIZE: 3479 *(u_int *)data = DEV_BSIZE; 3480 break; 3481 case DIOCGMEDIASIZE: 3482 *(off_t *)data = zv->zv_volsize; 3483 break; 3484 case DIOCGFLUSH: 3485 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3486 break; 3487 case DIOCGDELETE: 3488 if (!zvol_unmap_enabled) 3489 break; 3490 3491 offset = ((off_t *)data)[0]; 3492 length = ((off_t *)data)[1]; 3493 if ((offset % DEV_BSIZE) != 0 || (length % DEV_BSIZE) != 0 || 3494 offset < 0 || offset >= zv->zv_volsize || 3495 length <= 0) { 3496 printf("%s: offset=%jd length=%jd\n", __func__, offset, 3497 length); 3498 error = EINVAL; 3499 break; 3500 } 3501 3502 rl = zfs_range_lock(&zv->zv_znode, offset, length, RL_WRITER); 3503 dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 3504 error = dmu_tx_assign(tx, TXG_WAIT); 3505 if (error != 0) { 3506 sync = FALSE; 3507 dmu_tx_abort(tx); 3508 } else { 3509 sync = (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 3510 zvol_log_truncate(zv, tx, offset, length, sync); 3511 dmu_tx_commit(tx); 3512 error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 3513 offset, length); 3514 } 3515 zfs_range_unlock(rl); 3516 if (sync) 3517 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3518 break; 3519 case DIOCGSTRIPESIZE: 3520 *(off_t *)data = zv->zv_volblocksize; 3521 break; 3522 case DIOCGSTRIPEOFFSET: 3523 *(off_t *)data = 0; 3524 break; 3525 case DIOCGATTR: { 3526 spa_t *spa = dmu_objset_spa(zv->zv_objset); 3527 struct diocgattr_arg *arg = (struct diocgattr_arg *)data; 3528 uint64_t refd, avail, usedobjs, availobjs; 3529 3530 if (strcmp(arg->name, "GEOM::candelete") == 0) 3531 arg->value.i = 1; 3532 else if (strcmp(arg->name, "blocksavail") == 0) { 3533 dmu_objset_space(zv->zv_objset, &refd, &avail, 3534 &usedobjs, &availobjs); 3535 arg->value.off = avail / DEV_BSIZE; 3536 } else if (strcmp(arg->name, "blocksused") == 0) { 3537 dmu_objset_space(zv->zv_objset, &refd, &avail, 3538 &usedobjs, &availobjs); 3539 arg->value.off = refd / DEV_BSIZE; 3540 } else if (strcmp(arg->name, "poolblocksavail") == 0) { 3541 avail = metaslab_class_get_space(spa_normal_class(spa)); 3542 avail -= metaslab_class_get_alloc(spa_normal_class(spa)); 3543 arg->value.off = avail / DEV_BSIZE; 3544 } else if (strcmp(arg->name, "poolblocksused") == 0) { 3545 refd = metaslab_class_get_alloc(spa_normal_class(spa)); 3546 arg->value.off = refd / DEV_BSIZE; 3547 } else 3548 error = ENOIOCTL; 3549 break; 3550 } 3551 case FIOSEEKHOLE: 3552 case FIOSEEKDATA: { 3553 off_t *off = (off_t *)data; 3554 uint64_t noff; 3555 boolean_t hole; 3556 3557 hole = (cmd == FIOSEEKHOLE); 3558 noff = *off; 3559 error = dmu_offset_next(zv->zv_objset, ZVOL_OBJ, hole, &noff); 3560 *off = noff; 3561 break; 3562 } 3563 default: 3564 error = ENOIOCTL; 3565 } 3566 3567 return (error); 3568 } 3569 #endif /* __FreeBSD__ */ 3570 3571 #ifdef __NetBSD__ 3572 /*ARGSUSED*/ 3573 int 3574 zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 3575 { 3576 zvol_state_t *zv; 3577 int error = 0; 3578 3579 mutex_enter(&zfsdev_state_lock); 3580 3581 zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 3582 3583 if (zv == NULL) { 3584 mutex_exit(&zfsdev_state_lock); 3585 return (ENXIO); 3586 } 3587 3588 error = disk_ioctl(&zv->zv_dk, NODEV, cmd, (void *)arg, flag, curlwp); 3589 if (error != EPASSTHROUGH) { 3590 mutex_exit(&zfsdev_state_lock); 3591 return error; 3592 } 3593 3594 error = 0; 3595 3596 switch(cmd) { 3597 case DIOCCACHESYNC: 3598 zil_commit(zv->zv_zilog, ZVOL_OBJ); 3599 break; 3600 3601 case DIOCGWEDGEINFO: 3602 { 3603 struct dkwedge_info *dkw = (void *) arg; 3604 struct disk_geom *dg = &zv->zv_dk.dk_geom; 3605 3606 memset(dkw, 0, sizeof(*dkw)); 3607 strlcpy(dkw->dkw_devname, zv->zv_name, 3608 sizeof(dkw->dkw_devname)); 3609 3610 /* 3611 * dkw_parent is interpreted as disk device name by the kernel 3612 * to locate the disk driver and its geometry data. The faked 3613 * name "ZFS" must never match a device name. The kernel will 3614 * then call DIOCGPARTINFO below to retrieve the missing 3615 * information. 3616 * 3617 * Userland will also be confused, but it can use the 3618 * proplib based DIOCGDISKINFO to get the geometry 3619 * information. 3620 */ 3621 strlcpy(dkw->dkw_parent, "ZFS", sizeof(dkw->dkw_parent)); 3622 3623 dkw->dkw_offset = 0; 3624 dkw->dkw_size = dg->dg_secperunit; 3625 strcpy(dkw->dkw_ptype, DKW_PTYPE_FFS); 3626 3627 break; 3628 } 3629 3630 case DIOCGPARTINFO: 3631 { 3632 struct partinfo *pi = (void *) arg; 3633 struct disk_geom *dg = &zv->zv_dk.dk_geom; 3634 3635 memset(pi, 0, sizeof(*pi)); 3636 pi->pi_offset = 0; 3637 pi->pi_secsize = dg->dg_secsize; 3638 pi->pi_size = dg->dg_secperunit; 3639 pi->pi_fstype = FS_OTHER; 3640 pi->pi_bsize = MAX(BLKDEV_IOSIZE, pi->pi_secsize); 3641 3642 break; 3643 } 3644 3645 default: 3646 dprintf("unknown disk_ioctl called\n"); 3647 error = ENOTTY; 3648 break; 3649 } 3650 3651 mutex_exit(&zfsdev_state_lock); 3652 return (error); 3653 } 3654 #endif /* __NetBSD__ */ 3655
Indexes created Sun Jun 21 00:25:28 UTC 2026