1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22e08bf2c6SEric Taylor * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens /* 27fa9e4066Sahrens * ZFS volume emulation driver. 28fa9e4066Sahrens * 29fa9e4066Sahrens * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 30fa9e4066Sahrens * Volumes are accessed through the symbolic links named: 31fa9e4066Sahrens * 32fa9e4066Sahrens * /dev/zvol/dsk/<pool_name>/<dataset_name> 33fa9e4066Sahrens * /dev/zvol/rdsk/<pool_name>/<dataset_name> 34fa9e4066Sahrens * 35681d9761SEric Taylor * These links are created by the /dev filesystem (sdev_zvolops.c). 36fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 37fa9e4066Sahrens * run before opening and using a device. 38fa9e4066Sahrens */ 39fa9e4066Sahrens 40fa9e4066Sahrens #include <sys/types.h> 41fa9e4066Sahrens #include <sys/param.h> 42fa9e4066Sahrens #include <sys/errno.h> 43fa9e4066Sahrens #include <sys/uio.h> 44fa9e4066Sahrens #include <sys/buf.h> 45fa9e4066Sahrens #include <sys/modctl.h> 46fa9e4066Sahrens #include <sys/open.h> 47fa9e4066Sahrens #include <sys/kmem.h> 48fa9e4066Sahrens #include <sys/conf.h> 49fa9e4066Sahrens #include <sys/cmn_err.h> 50fa9e4066Sahrens #include <sys/stat.h> 51fa9e4066Sahrens #include <sys/zap.h> 52fa9e4066Sahrens #include <sys/spa.h> 53fa9e4066Sahrens #include <sys/zio.h> 54e7cbe64fSgw #include <sys/dmu_traverse.h> 55e7cbe64fSgw #include <sys/dnode.h> 56e7cbe64fSgw #include <sys/dsl_dataset.h> 57fa9e4066Sahrens #include <sys/dsl_prop.h> 58fa9e4066Sahrens #include <sys/dkio.h> 59fa9e4066Sahrens #include <sys/efi_partition.h> 60fa9e4066Sahrens #include <sys/byteorder.h> 61fa9e4066Sahrens #include <sys/pathname.h> 62fa9e4066Sahrens #include <sys/ddi.h> 63fa9e4066Sahrens #include <sys/sunddi.h> 64fa9e4066Sahrens #include <sys/crc32.h> 65fa9e4066Sahrens #include <sys/dirent.h> 66fa9e4066Sahrens #include <sys/policy.h> 67fa9e4066Sahrens #include <sys/fs/zfs.h> 68fa9e4066Sahrens #include <sys/zfs_ioctl.h> 69fa9e4066Sahrens #include <sys/mkdev.h> 7022ac5be4Sperrin #include <sys/zil.h> 71c5c6ffa0Smaybee #include <sys/refcount.h> 72c2e6a7d6Sperrin #include <sys/zfs_znode.h> 73c2e6a7d6Sperrin #include <sys/zfs_rlock.h> 74e7cbe64fSgw #include <sys/vdev_disk.h> 75e7cbe64fSgw #include <sys/vdev_impl.h> 76e7cbe64fSgw #include <sys/zvol.h> 77e7cbe64fSgw #include <sys/dumphdr.h> 781209a471SNeil Perrin #include <sys/zil_impl.h> 79fa9e4066Sahrens 80fa9e4066Sahrens #include "zfs_namecheck.h" 81fa9e4066Sahrens 82fa9e4066Sahrens static void *zvol_state; 83503ad85cSMatthew Ahrens static char *zvol_tag = "zvol_tag"; 84fa9e4066Sahrens 85e7cbe64fSgw #define ZVOL_DUMPSIZE "dumpsize" 86e7cbe64fSgw 87fa9e4066Sahrens /* 88fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 89fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 90fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 91fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 92fa9e4066Sahrens */ 93fa9e4066Sahrens static kmutex_t zvol_state_lock; 94fa9e4066Sahrens static uint32_t zvol_minors; 95fa9e4066Sahrens 96e7cbe64fSgw typedef struct zvol_extent { 9788b7b0f2SMatthew Ahrens list_node_t ze_node; 98e7cbe64fSgw dva_t ze_dva; /* dva associated with this extent */ 9988b7b0f2SMatthew Ahrens uint64_t ze_nblks; /* number of blocks in extent */ 100e7cbe64fSgw } zvol_extent_t; 101e7cbe64fSgw 102fa9e4066Sahrens /* 103fa9e4066Sahrens * The in-core state of each volume. 104fa9e4066Sahrens */ 105fa9e4066Sahrens typedef struct zvol_state { 106fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 107fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 10867bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 109fa9e4066Sahrens minor_t zv_minor; /* minor number */ 110fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 111701f66c4SEric Taylor uint8_t zv_flags; /* readonly, dumpified, etc. */ 112fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 113fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 114fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 11522ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 11688b7b0f2SMatthew Ahrens list_t zv_extents; /* List of extents for dump */ 117c2e6a7d6Sperrin znode_t zv_znode; /* for range locking */ 118fa9e4066Sahrens } zvol_state_t; 119fa9e4066Sahrens 120e7cbe64fSgw /* 121e7cbe64fSgw * zvol specific flags 122e7cbe64fSgw */ 123e7cbe64fSgw #define ZVOL_RDONLY 0x1 124e7cbe64fSgw #define ZVOL_DUMPIFIED 0x2 125c7f714e2SEric Taylor #define ZVOL_EXCL 0x4 126701f66c4SEric Taylor #define ZVOL_WCE 0x8 127e7cbe64fSgw 12867bd71c6Sperrin /* 12967bd71c6Sperrin * zvol maximum transfer in one DMU tx. 13067bd71c6Sperrin */ 13167bd71c6Sperrin int zvol_maxphys = DMU_MAX_ACCESS/2; 13267bd71c6Sperrin 133*92241e0bSTom Erickson extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 134*92241e0bSTom Erickson nvlist_t *, nvlist_t **); 135681d9761SEric Taylor static int zvol_remove_zv(zvol_state_t *); 136feb08c6bSbillm static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 137e7cbe64fSgw static int zvol_dumpify(zvol_state_t *zv); 138e7cbe64fSgw static int zvol_dump_fini(zvol_state_t *zv); 139e7cbe64fSgw static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 14067bd71c6Sperrin 141fa9e4066Sahrens static void 142681d9761SEric Taylor zvol_size_changed(uint64_t volsize, major_t maj, minor_t min) 143fa9e4066Sahrens { 144681d9761SEric Taylor dev_t dev = makedevice(maj, min); 145fa9e4066Sahrens 146fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 147681d9761SEric Taylor "Size", volsize) == DDI_SUCCESS); 148fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 149681d9761SEric Taylor "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 150e7cbe64fSgw 151e7cbe64fSgw /* Notify specfs to invalidate the cached size */ 152e7cbe64fSgw spec_size_invalidate(dev, VBLK); 153e7cbe64fSgw spec_size_invalidate(dev, VCHR); 154fa9e4066Sahrens } 155fa9e4066Sahrens 156fa9e4066Sahrens int 157e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 158fa9e4066Sahrens { 159e9dbad6fSeschrock if (volsize == 0) 160fa9e4066Sahrens return (EINVAL); 161fa9e4066Sahrens 162e9dbad6fSeschrock if (volsize % blocksize != 0) 1635c5460e9Seschrock return (EINVAL); 1645c5460e9Seschrock 165fa9e4066Sahrens #ifdef _ILP32 166e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 167fa9e4066Sahrens return (EOVERFLOW); 168fa9e4066Sahrens #endif 169fa9e4066Sahrens return (0); 170fa9e4066Sahrens } 171fa9e4066Sahrens 172fa9e4066Sahrens int 173e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 174fa9e4066Sahrens { 175e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 176e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 177e9dbad6fSeschrock !ISP2(volblocksize)) 178fa9e4066Sahrens return (EDOM); 179fa9e4066Sahrens 180fa9e4066Sahrens return (0); 181fa9e4066Sahrens } 182fa9e4066Sahrens 183fa9e4066Sahrens int 184a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 185fa9e4066Sahrens { 186fa9e4066Sahrens int error; 187fa9e4066Sahrens dmu_object_info_t doi; 188a2eea2e1Sahrens uint64_t val; 189fa9e4066Sahrens 190a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 191fa9e4066Sahrens if (error) 192fa9e4066Sahrens return (error); 193fa9e4066Sahrens 194a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 195a2eea2e1Sahrens 196fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 197fa9e4066Sahrens 198a2eea2e1Sahrens if (error == 0) { 199a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 200a2eea2e1Sahrens doi.doi_data_block_size); 201a2eea2e1Sahrens } 202fa9e4066Sahrens 203fa9e4066Sahrens return (error); 204fa9e4066Sahrens } 205fa9e4066Sahrens 206fa9e4066Sahrens /* 207fa9e4066Sahrens * Find a free minor number. 208fa9e4066Sahrens */ 209fa9e4066Sahrens static minor_t 210fa9e4066Sahrens zvol_minor_alloc(void) 211fa9e4066Sahrens { 212fa9e4066Sahrens minor_t minor; 213fa9e4066Sahrens 214fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 215fa9e4066Sahrens 216fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 217fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 218fa9e4066Sahrens return (minor); 219fa9e4066Sahrens 220fa9e4066Sahrens return (0); 221fa9e4066Sahrens } 222fa9e4066Sahrens 223fa9e4066Sahrens static zvol_state_t * 224e9dbad6fSeschrock zvol_minor_lookup(const char *name) 225fa9e4066Sahrens { 226fa9e4066Sahrens minor_t minor; 227fa9e4066Sahrens zvol_state_t *zv; 228fa9e4066Sahrens 229fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 230fa9e4066Sahrens 231fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 232fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 233fa9e4066Sahrens if (zv == NULL) 234fa9e4066Sahrens continue; 235fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 236fa9e4066Sahrens break; 237fa9e4066Sahrens } 238fa9e4066Sahrens 239fa9e4066Sahrens return (zv); 240fa9e4066Sahrens } 241fa9e4066Sahrens 242e7cbe64fSgw /* extent mapping arg */ 243e7cbe64fSgw struct maparg { 24488b7b0f2SMatthew Ahrens zvol_state_t *ma_zv; 24588b7b0f2SMatthew Ahrens uint64_t ma_blks; 246e7cbe64fSgw }; 247e7cbe64fSgw 248e7cbe64fSgw /*ARGSUSED*/ 249e7cbe64fSgw static int 250b24ab676SJeff Bonwick zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 251b24ab676SJeff Bonwick const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) 252e7cbe64fSgw { 25388b7b0f2SMatthew Ahrens struct maparg *ma = arg; 25488b7b0f2SMatthew Ahrens zvol_extent_t *ze; 25588b7b0f2SMatthew Ahrens int bs = ma->ma_zv->zv_volblocksize; 256e7cbe64fSgw 25788b7b0f2SMatthew Ahrens if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 25888b7b0f2SMatthew Ahrens return (0); 259e7cbe64fSgw 26088b7b0f2SMatthew Ahrens VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 26188b7b0f2SMatthew Ahrens ma->ma_blks++; 262e7cbe64fSgw 26388b7b0f2SMatthew Ahrens /* Abort immediately if we have encountered gang blocks */ 26488b7b0f2SMatthew Ahrens if (BP_IS_GANG(bp)) 26588b7b0f2SMatthew Ahrens return (EFRAGS); 266e7cbe64fSgw 26788b7b0f2SMatthew Ahrens /* 26888b7b0f2SMatthew Ahrens * See if the block is at the end of the previous extent. 26988b7b0f2SMatthew Ahrens */ 27088b7b0f2SMatthew Ahrens ze = list_tail(&ma->ma_zv->zv_extents); 27188b7b0f2SMatthew Ahrens if (ze && 27288b7b0f2SMatthew Ahrens DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 27388b7b0f2SMatthew Ahrens DVA_GET_OFFSET(BP_IDENTITY(bp)) == 27488b7b0f2SMatthew Ahrens DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 27588b7b0f2SMatthew Ahrens ze->ze_nblks++; 27688b7b0f2SMatthew Ahrens return (0); 277e7cbe64fSgw } 278e7cbe64fSgw 27988b7b0f2SMatthew Ahrens dprintf_bp(bp, "%s", "next blkptr:"); 280e7cbe64fSgw 28188b7b0f2SMatthew Ahrens /* start a new extent */ 28288b7b0f2SMatthew Ahrens ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 28388b7b0f2SMatthew Ahrens ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 28488b7b0f2SMatthew Ahrens ze->ze_nblks = 1; 28588b7b0f2SMatthew Ahrens list_insert_tail(&ma->ma_zv->zv_extents, ze); 28688b7b0f2SMatthew Ahrens return (0); 28788b7b0f2SMatthew Ahrens } 288e7cbe64fSgw 28988b7b0f2SMatthew Ahrens static void 29088b7b0f2SMatthew Ahrens zvol_free_extents(zvol_state_t *zv) 29188b7b0f2SMatthew Ahrens { 29288b7b0f2SMatthew Ahrens zvol_extent_t *ze; 293e7cbe64fSgw 29488b7b0f2SMatthew Ahrens while (ze = list_head(&zv->zv_extents)) { 29588b7b0f2SMatthew Ahrens list_remove(&zv->zv_extents, ze); 29688b7b0f2SMatthew Ahrens kmem_free(ze, sizeof (zvol_extent_t)); 297e7cbe64fSgw } 29888b7b0f2SMatthew Ahrens } 299e7cbe64fSgw 30088b7b0f2SMatthew Ahrens static int 30188b7b0f2SMatthew Ahrens zvol_get_lbas(zvol_state_t *zv) 30288b7b0f2SMatthew Ahrens { 30388b7b0f2SMatthew Ahrens struct maparg ma; 30488b7b0f2SMatthew Ahrens int err; 30588b7b0f2SMatthew Ahrens 30688b7b0f2SMatthew Ahrens ma.ma_zv = zv; 30788b7b0f2SMatthew Ahrens ma.ma_blks = 0; 30888b7b0f2SMatthew Ahrens zvol_free_extents(zv); 30988b7b0f2SMatthew Ahrens 31088b7b0f2SMatthew Ahrens err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0, 31188b7b0f2SMatthew Ahrens TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 31288b7b0f2SMatthew Ahrens if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 31388b7b0f2SMatthew Ahrens zvol_free_extents(zv); 31488b7b0f2SMatthew Ahrens return (err ? err : EIO); 315e7cbe64fSgw } 31688b7b0f2SMatthew Ahrens 317e7cbe64fSgw return (0); 318e7cbe64fSgw } 319e7cbe64fSgw 320ecd6cf80Smarks /* ARGSUSED */ 321fa9e4066Sahrens void 322ecd6cf80Smarks zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 323fa9e4066Sahrens { 324da6c28aaSamw zfs_creat_t *zct = arg; 325da6c28aaSamw nvlist_t *nvprops = zct->zct_props; 326fa9e4066Sahrens int error; 327e9dbad6fSeschrock uint64_t volblocksize, volsize; 328fa9e4066Sahrens 329ecd6cf80Smarks VERIFY(nvlist_lookup_uint64(nvprops, 330e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 331ecd6cf80Smarks if (nvlist_lookup_uint64(nvprops, 332e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 333e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 334e9dbad6fSeschrock 335e9dbad6fSeschrock /* 336e7cbe64fSgw * These properties must be removed from the list so the generic 337e9dbad6fSeschrock * property setting step won't apply to them. 338e9dbad6fSeschrock */ 339ecd6cf80Smarks VERIFY(nvlist_remove_all(nvprops, 340e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 341ecd6cf80Smarks (void) nvlist_remove_all(nvprops, 342e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 343e9dbad6fSeschrock 344e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 345fa9e4066Sahrens DMU_OT_NONE, 0, tx); 346fa9e4066Sahrens ASSERT(error == 0); 347fa9e4066Sahrens 348fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 349fa9e4066Sahrens DMU_OT_NONE, 0, tx); 350fa9e4066Sahrens ASSERT(error == 0); 351fa9e4066Sahrens 352e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 353fa9e4066Sahrens ASSERT(error == 0); 354fa9e4066Sahrens } 355fa9e4066Sahrens 35622ac5be4Sperrin /* 35722ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 35822ac5be4Sperrin * after a system failure 35922ac5be4Sperrin */ 36022ac5be4Sperrin static int 36122ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 36222ac5be4Sperrin { 36322ac5be4Sperrin objset_t *os = zv->zv_objset; 36422ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 365b24ab676SJeff Bonwick uint64_t offset, length; 36622ac5be4Sperrin dmu_tx_t *tx; 36722ac5be4Sperrin int error; 36822ac5be4Sperrin 36922ac5be4Sperrin if (byteswap) 37022ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 37122ac5be4Sperrin 372b24ab676SJeff Bonwick offset = lr->lr_offset; 373b24ab676SJeff Bonwick length = lr->lr_length; 374b24ab676SJeff Bonwick 375b24ab676SJeff Bonwick /* If it's a dmu_sync() block, write the whole block */ 376b24ab676SJeff Bonwick if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 377b24ab676SJeff Bonwick uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 378b24ab676SJeff Bonwick if (length < blocksize) { 379b24ab676SJeff Bonwick offset -= offset % blocksize; 380b24ab676SJeff Bonwick length = blocksize; 381b24ab676SJeff Bonwick } 382b24ab676SJeff Bonwick } 383975c32a0SNeil Perrin 38422ac5be4Sperrin tx = dmu_tx_create(os); 385b24ab676SJeff Bonwick dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 3861209a471SNeil Perrin error = dmu_tx_assign(tx, TXG_WAIT); 38722ac5be4Sperrin if (error) { 38822ac5be4Sperrin dmu_tx_abort(tx); 38922ac5be4Sperrin } else { 390b24ab676SJeff Bonwick dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 39122ac5be4Sperrin dmu_tx_commit(tx); 39222ac5be4Sperrin } 39322ac5be4Sperrin 39422ac5be4Sperrin return (error); 39522ac5be4Sperrin } 39622ac5be4Sperrin 39722ac5be4Sperrin /* ARGSUSED */ 39822ac5be4Sperrin static int 39922ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 40022ac5be4Sperrin { 40122ac5be4Sperrin return (ENOTSUP); 40222ac5be4Sperrin } 40322ac5be4Sperrin 40422ac5be4Sperrin /* 40522ac5be4Sperrin * Callback vectors for replaying records. 40622ac5be4Sperrin * Only TX_WRITE is needed for zvol. 40722ac5be4Sperrin */ 40822ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 40922ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 41022ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 41122ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 41222ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 41322ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 41422ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 41522ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 41622ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 41722ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 41822ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 41922ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 42022ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 42122ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 422975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL */ 423975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ATTR */ 424975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 425975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL */ 426975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ATTR */ 427975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 428975c32a0SNeil Perrin zvol_replay_err, /* TX_WRITE2 */ 42922ac5be4Sperrin }; 43022ac5be4Sperrin 431681d9761SEric Taylor int 432681d9761SEric Taylor zvol_name2minor(const char *name, minor_t *minor) 433681d9761SEric Taylor { 434681d9761SEric Taylor zvol_state_t *zv; 435681d9761SEric Taylor 436681d9761SEric Taylor mutex_enter(&zvol_state_lock); 437681d9761SEric Taylor zv = zvol_minor_lookup(name); 438681d9761SEric Taylor if (minor && zv) 439681d9761SEric Taylor *minor = zv->zv_minor; 440681d9761SEric Taylor mutex_exit(&zvol_state_lock); 441681d9761SEric Taylor return (zv ? 0 : -1); 442681d9761SEric Taylor } 443681d9761SEric Taylor 444e7cbe64fSgw /* 445e7cbe64fSgw * Create a minor node (plus a whole lot more) for the specified volume. 446fa9e4066Sahrens */ 447fa9e4066Sahrens int 448681d9761SEric Taylor zvol_create_minor(const char *name) 449fa9e4066Sahrens { 450fa9e4066Sahrens zvol_state_t *zv; 451fa9e4066Sahrens objset_t *os; 45267bd71c6Sperrin dmu_object_info_t doi; 453fa9e4066Sahrens minor_t minor = 0; 454fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 455fa9e4066Sahrens int error; 456fa9e4066Sahrens 457fa9e4066Sahrens mutex_enter(&zvol_state_lock); 458fa9e4066Sahrens 459fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 460fa9e4066Sahrens mutex_exit(&zvol_state_lock); 461fa9e4066Sahrens return (EEXIST); 462fa9e4066Sahrens } 463fa9e4066Sahrens 464503ad85cSMatthew Ahrens /* lie and say we're read-only */ 465503ad85cSMatthew Ahrens error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, zvol_tag, &os); 466fa9e4066Sahrens 467fa9e4066Sahrens if (error) { 468fa9e4066Sahrens mutex_exit(&zvol_state_lock); 469fa9e4066Sahrens return (error); 470fa9e4066Sahrens } 471fa9e4066Sahrens 472681d9761SEric Taylor if ((minor = zvol_minor_alloc()) == 0) { 473503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 474fa9e4066Sahrens mutex_exit(&zvol_state_lock); 475fa9e4066Sahrens return (ENXIO); 476fa9e4066Sahrens } 477fa9e4066Sahrens 478fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 479503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 480fa9e4066Sahrens mutex_exit(&zvol_state_lock); 481fa9e4066Sahrens return (EAGAIN); 482fa9e4066Sahrens } 483e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 484e9dbad6fSeschrock (char *)name); 485fa9e4066Sahrens 486681d9761SEric Taylor (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 487fa9e4066Sahrens 488fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 489fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 490fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 491503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 492fa9e4066Sahrens mutex_exit(&zvol_state_lock); 493fa9e4066Sahrens return (EAGAIN); 494fa9e4066Sahrens } 495fa9e4066Sahrens 496681d9761SEric Taylor (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 497fa9e4066Sahrens 498fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 499fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 500fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 501fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 502503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 503fa9e4066Sahrens mutex_exit(&zvol_state_lock); 504fa9e4066Sahrens return (EAGAIN); 505fa9e4066Sahrens } 506fa9e4066Sahrens 507fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 508fa9e4066Sahrens 509681d9761SEric Taylor (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 510fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 511fa9e4066Sahrens zv->zv_minor = minor; 512fa9e4066Sahrens zv->zv_objset = os; 513681d9761SEric Taylor if (dmu_objset_is_snapshot(os)) 514681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 515c2e6a7d6Sperrin mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 516c2e6a7d6Sperrin avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 517c2e6a7d6Sperrin sizeof (rl_t), offsetof(rl_t, r_node)); 51888b7b0f2SMatthew Ahrens list_create(&zv->zv_extents, sizeof (zvol_extent_t), 51988b7b0f2SMatthew Ahrens offsetof(zvol_extent_t, ze_node)); 52067bd71c6Sperrin /* get and cache the blocksize */ 52167bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 52267bd71c6Sperrin ASSERT(error == 0); 52367bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 52422ac5be4Sperrin 5251209a471SNeil Perrin zil_replay(os, zv, zvol_replay_vector); 526681d9761SEric Taylor dmu_objset_disown(os, zvol_tag); 527681d9761SEric Taylor zv->zv_objset = NULL; 528fa9e4066Sahrens 529fa9e4066Sahrens zvol_minors++; 530fa9e4066Sahrens 531fa9e4066Sahrens mutex_exit(&zvol_state_lock); 532fa9e4066Sahrens 533fa9e4066Sahrens return (0); 534fa9e4066Sahrens } 535fa9e4066Sahrens 536fa9e4066Sahrens /* 537fa9e4066Sahrens * Remove minor node for the specified volume. 538fa9e4066Sahrens */ 539681d9761SEric Taylor static int 540681d9761SEric Taylor zvol_remove_zv(zvol_state_t *zv) 541681d9761SEric Taylor { 542681d9761SEric Taylor char nmbuf[20]; 543681d9761SEric Taylor 544681d9761SEric Taylor ASSERT(MUTEX_HELD(&zvol_state_lock)); 545681d9761SEric Taylor if (zv->zv_total_opens != 0) 546681d9761SEric Taylor return (EBUSY); 547681d9761SEric Taylor 548681d9761SEric Taylor (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", zv->zv_minor); 549681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 550681d9761SEric Taylor 551681d9761SEric Taylor (void) snprintf(nmbuf, sizeof (nmbuf), "%u", zv->zv_minor); 552681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 553681d9761SEric Taylor 554681d9761SEric Taylor avl_destroy(&zv->zv_znode.z_range_avl); 555681d9761SEric Taylor mutex_destroy(&zv->zv_znode.z_range_lock); 556681d9761SEric Taylor 557681d9761SEric Taylor ddi_soft_state_free(zvol_state, zv->zv_minor); 558681d9761SEric Taylor 559681d9761SEric Taylor zvol_minors--; 560681d9761SEric Taylor return (0); 561681d9761SEric Taylor } 562681d9761SEric Taylor 563fa9e4066Sahrens int 564e9dbad6fSeschrock zvol_remove_minor(const char *name) 565fa9e4066Sahrens { 566fa9e4066Sahrens zvol_state_t *zv; 567681d9761SEric Taylor int rc; 568fa9e4066Sahrens 569fa9e4066Sahrens mutex_enter(&zvol_state_lock); 570e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 571fa9e4066Sahrens mutex_exit(&zvol_state_lock); 572fa9e4066Sahrens return (ENXIO); 573fa9e4066Sahrens } 574681d9761SEric Taylor rc = zvol_remove_zv(zv); 575681d9761SEric Taylor mutex_exit(&zvol_state_lock); 576681d9761SEric Taylor return (rc); 577681d9761SEric Taylor } 578fa9e4066Sahrens 579681d9761SEric Taylor int 580681d9761SEric Taylor zvol_first_open(zvol_state_t *zv) 581681d9761SEric Taylor { 582681d9761SEric Taylor objset_t *os; 583681d9761SEric Taylor uint64_t volsize; 584681d9761SEric Taylor int error; 585681d9761SEric Taylor uint64_t readonly; 586fa9e4066Sahrens 587681d9761SEric Taylor /* lie and say we're read-only */ 588681d9761SEric Taylor error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 589681d9761SEric Taylor zvol_tag, &os); 590681d9761SEric Taylor if (error) 591681d9761SEric Taylor return (error); 592fa9e4066Sahrens 593681d9761SEric Taylor error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 594681d9761SEric Taylor if (error) { 595681d9761SEric Taylor ASSERT(error == 0); 596681d9761SEric Taylor dmu_objset_disown(os, zvol_tag); 597681d9761SEric Taylor return (error); 598681d9761SEric Taylor } 599681d9761SEric Taylor zv->zv_objset = os; 600681d9761SEric Taylor zv->zv_volsize = volsize; 601681d9761SEric Taylor zv->zv_zilog = zil_open(os, zvol_get_data); 602681d9761SEric Taylor zvol_size_changed(zv->zv_volsize, ddi_driver_major(zfs_dip), 603681d9761SEric Taylor zv->zv_minor); 604fa9e4066Sahrens 605681d9761SEric Taylor VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 606681d9761SEric Taylor NULL) == 0); 607681d9761SEric Taylor if (readonly || dmu_objset_is_snapshot(os)) 608681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 609681d9761SEric Taylor else 610681d9761SEric Taylor zv->zv_flags &= ~ZVOL_RDONLY; 611681d9761SEric Taylor return (error); 612681d9761SEric Taylor } 613fa9e4066Sahrens 614681d9761SEric Taylor void 615681d9761SEric Taylor zvol_last_close(zvol_state_t *zv) 616681d9761SEric Taylor { 61722ac5be4Sperrin zil_close(zv->zv_zilog); 61822ac5be4Sperrin zv->zv_zilog = NULL; 619503ad85cSMatthew Ahrens dmu_objset_disown(zv->zv_objset, zvol_tag); 620fa9e4066Sahrens zv->zv_objset = NULL; 621fa9e4066Sahrens } 622fa9e4066Sahrens 623e7cbe64fSgw int 624e7cbe64fSgw zvol_prealloc(zvol_state_t *zv) 625e7cbe64fSgw { 626e7cbe64fSgw objset_t *os = zv->zv_objset; 627e7cbe64fSgw dmu_tx_t *tx; 628e7cbe64fSgw uint64_t refd, avail, usedobjs, availobjs; 629e7cbe64fSgw uint64_t resid = zv->zv_volsize; 630e7cbe64fSgw uint64_t off = 0; 631e7cbe64fSgw 632e7cbe64fSgw /* Check the space usage before attempting to allocate the space */ 633e7cbe64fSgw dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 634e7cbe64fSgw if (avail < zv->zv_volsize) 635e7cbe64fSgw return (ENOSPC); 636e7cbe64fSgw 637e7cbe64fSgw /* Free old extents if they exist */ 638e7cbe64fSgw zvol_free_extents(zv); 639e7cbe64fSgw 640e7cbe64fSgw while (resid != 0) { 641e7cbe64fSgw int error; 642e7cbe64fSgw uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); 643e7cbe64fSgw 644e7cbe64fSgw tx = dmu_tx_create(os); 645e7cbe64fSgw dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 646e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 647e7cbe64fSgw if (error) { 648e7cbe64fSgw dmu_tx_abort(tx); 649cdb0ab79Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 650e7cbe64fSgw return (error); 651e7cbe64fSgw } 65282c9918fSTim Haley dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 653e7cbe64fSgw dmu_tx_commit(tx); 654e7cbe64fSgw off += bytes; 655e7cbe64fSgw resid -= bytes; 656e7cbe64fSgw } 657e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 658e7cbe64fSgw 659e7cbe64fSgw return (0); 660e7cbe64fSgw } 661e7cbe64fSgw 662e7cbe64fSgw int 663681d9761SEric Taylor zvol_update_volsize(objset_t *os, uint64_t volsize) 664e7cbe64fSgw { 665e7cbe64fSgw dmu_tx_t *tx; 666e7cbe64fSgw int error; 667e7cbe64fSgw 668e7cbe64fSgw ASSERT(MUTEX_HELD(&zvol_state_lock)); 669e7cbe64fSgw 670681d9761SEric Taylor tx = dmu_tx_create(os); 671e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 672e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 673e7cbe64fSgw if (error) { 674e7cbe64fSgw dmu_tx_abort(tx); 675e7cbe64fSgw return (error); 676e7cbe64fSgw } 677e7cbe64fSgw 678681d9761SEric Taylor error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 679e7cbe64fSgw &volsize, tx); 680e7cbe64fSgw dmu_tx_commit(tx); 681e7cbe64fSgw 682e7cbe64fSgw if (error == 0) 683681d9761SEric Taylor error = dmu_free_long_range(os, 684cdb0ab79Smaybee ZVOL_OBJ, volsize, DMU_OBJECT_END); 685681d9761SEric Taylor return (error); 686681d9761SEric Taylor } 687e7cbe64fSgw 688681d9761SEric Taylor void 689681d9761SEric Taylor zvol_remove_minors(const char *name) 690681d9761SEric Taylor { 691681d9761SEric Taylor zvol_state_t *zv; 692681d9761SEric Taylor char *namebuf; 693681d9761SEric Taylor minor_t minor; 694681d9761SEric Taylor 695681d9761SEric Taylor namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 696681d9761SEric Taylor (void) strncpy(namebuf, name, strlen(name)); 697681d9761SEric Taylor (void) strcat(namebuf, "/"); 698681d9761SEric Taylor mutex_enter(&zvol_state_lock); 699681d9761SEric Taylor for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 700681d9761SEric Taylor 701681d9761SEric Taylor zv = ddi_get_soft_state(zvol_state, minor); 702681d9761SEric Taylor if (zv == NULL) 703681d9761SEric Taylor continue; 704681d9761SEric Taylor if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 705681d9761SEric Taylor (void) zvol_remove_zv(zv); 706e7cbe64fSgw } 707681d9761SEric Taylor kmem_free(namebuf, strlen(name) + 2); 708681d9761SEric Taylor 709681d9761SEric Taylor mutex_exit(&zvol_state_lock); 710e7cbe64fSgw } 711e7cbe64fSgw 712fa9e4066Sahrens int 71391ebeef5Sahrens zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 714fa9e4066Sahrens { 715681d9761SEric Taylor zvol_state_t *zv = NULL; 716681d9761SEric Taylor objset_t *os; 717fa9e4066Sahrens int error; 7185c5460e9Seschrock dmu_object_info_t doi; 719e7cbe64fSgw uint64_t old_volsize = 0ULL; 720681d9761SEric Taylor uint64_t readonly; 721fa9e4066Sahrens 722fa9e4066Sahrens mutex_enter(&zvol_state_lock); 723681d9761SEric Taylor zv = zvol_minor_lookup(name); 724681d9761SEric Taylor if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 725681d9761SEric Taylor mutex_exit(&zvol_state_lock); 726681d9761SEric Taylor return (error); 727fa9e4066Sahrens } 728fa9e4066Sahrens 729681d9761SEric Taylor if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 730e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 731bb0ade09Sahrens doi.doi_data_block_size)) != 0) 732bb0ade09Sahrens goto out; 7335c5460e9Seschrock 734681d9761SEric Taylor VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, 735681d9761SEric Taylor NULL) == 0); 736681d9761SEric Taylor if (readonly) { 737bb0ade09Sahrens error = EROFS; 738bb0ade09Sahrens goto out; 739fa9e4066Sahrens } 740fa9e4066Sahrens 741681d9761SEric Taylor error = zvol_update_volsize(os, volsize); 742e7cbe64fSgw /* 743e7cbe64fSgw * Reinitialize the dump area to the new size. If we 744681d9761SEric Taylor * failed to resize the dump area then restore it back to 745681d9761SEric Taylor * its original size. 746e7cbe64fSgw */ 747681d9761SEric Taylor if (zv && error == 0) { 748681d9761SEric Taylor if (zv->zv_flags & ZVOL_DUMPIFIED) { 749681d9761SEric Taylor old_volsize = zv->zv_volsize; 750681d9761SEric Taylor zv->zv_volsize = volsize; 751681d9761SEric Taylor if ((error = zvol_dumpify(zv)) != 0 || 752681d9761SEric Taylor (error = dumpvp_resize()) != 0) { 753681d9761SEric Taylor (void) zvol_update_volsize(os, old_volsize); 754681d9761SEric Taylor zv->zv_volsize = old_volsize; 755681d9761SEric Taylor error = zvol_dumpify(zv); 756681d9761SEric Taylor } 757681d9761SEric Taylor } 758681d9761SEric Taylor if (error == 0) { 759681d9761SEric Taylor zv->zv_volsize = volsize; 760681d9761SEric Taylor zvol_size_changed(volsize, maj, zv->zv_minor); 761e7cbe64fSgw } 762fa9e4066Sahrens } 763fa9e4066Sahrens 764573ca77eSGeorge Wilson /* 765573ca77eSGeorge Wilson * Generate a LUN expansion event. 766573ca77eSGeorge Wilson */ 767681d9761SEric Taylor if (zv && error == 0) { 768573ca77eSGeorge Wilson sysevent_id_t eid; 769573ca77eSGeorge Wilson nvlist_t *attr; 770573ca77eSGeorge Wilson char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 771573ca77eSGeorge Wilson 772681d9761SEric Taylor (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 773573ca77eSGeorge Wilson zv->zv_minor); 774573ca77eSGeorge Wilson 775573ca77eSGeorge Wilson VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 776573ca77eSGeorge Wilson VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 777573ca77eSGeorge Wilson 778573ca77eSGeorge Wilson (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 779573ca77eSGeorge Wilson ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 780573ca77eSGeorge Wilson 781573ca77eSGeorge Wilson nvlist_free(attr); 782573ca77eSGeorge Wilson kmem_free(physpath, MAXPATHLEN); 783573ca77eSGeorge Wilson } 784573ca77eSGeorge Wilson 785bb0ade09Sahrens out: 786681d9761SEric Taylor dmu_objset_rele(os, FTAG); 787bb0ade09Sahrens 788fa9e4066Sahrens mutex_exit(&zvol_state_lock); 789fa9e4066Sahrens 790fa9e4066Sahrens return (error); 791fa9e4066Sahrens } 792fa9e4066Sahrens 793fa9e4066Sahrens /*ARGSUSED*/ 794fa9e4066Sahrens int 795fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 796fa9e4066Sahrens { 797fa9e4066Sahrens minor_t minor = getminor(*devp); 798fa9e4066Sahrens zvol_state_t *zv; 799681d9761SEric Taylor int err = 0; 800fa9e4066Sahrens 801fa9e4066Sahrens if (minor == 0) /* This is the control device */ 802fa9e4066Sahrens return (0); 803fa9e4066Sahrens 804fa9e4066Sahrens mutex_enter(&zvol_state_lock); 805fa9e4066Sahrens 806fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 807fa9e4066Sahrens if (zv == NULL) { 808fa9e4066Sahrens mutex_exit(&zvol_state_lock); 809fa9e4066Sahrens return (ENXIO); 810fa9e4066Sahrens } 811fa9e4066Sahrens 812681d9761SEric Taylor if (zv->zv_total_opens == 0) 813681d9761SEric Taylor err = zvol_first_open(zv); 814681d9761SEric Taylor if (err) { 815fa9e4066Sahrens mutex_exit(&zvol_state_lock); 816681d9761SEric Taylor return (err); 817681d9761SEric Taylor } 818681d9761SEric Taylor if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 819681d9761SEric Taylor err = EROFS; 820681d9761SEric Taylor goto out; 821fa9e4066Sahrens } 822c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 823681d9761SEric Taylor err = EBUSY; 824681d9761SEric Taylor goto out; 825c7f714e2SEric Taylor } 826c7f714e2SEric Taylor if (flag & FEXCL) { 827c7f714e2SEric Taylor if (zv->zv_total_opens != 0) { 828681d9761SEric Taylor err = EBUSY; 829681d9761SEric Taylor goto out; 830c7f714e2SEric Taylor } 831c7f714e2SEric Taylor zv->zv_flags |= ZVOL_EXCL; 832c7f714e2SEric Taylor } 833fa9e4066Sahrens 834fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 835fa9e4066Sahrens zv->zv_open_count[otyp]++; 836fa9e4066Sahrens zv->zv_total_opens++; 837fa9e4066Sahrens } 838fa9e4066Sahrens mutex_exit(&zvol_state_lock); 839fa9e4066Sahrens 840681d9761SEric Taylor return (err); 841681d9761SEric Taylor out: 842681d9761SEric Taylor if (zv->zv_total_opens == 0) 843681d9761SEric Taylor zvol_last_close(zv); 844681d9761SEric Taylor mutex_exit(&zvol_state_lock); 845681d9761SEric Taylor return (err); 846fa9e4066Sahrens } 847fa9e4066Sahrens 848fa9e4066Sahrens /*ARGSUSED*/ 849fa9e4066Sahrens int 850fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 851fa9e4066Sahrens { 852fa9e4066Sahrens minor_t minor = getminor(dev); 853fa9e4066Sahrens zvol_state_t *zv; 854681d9761SEric Taylor int error = 0; 855fa9e4066Sahrens 856fa9e4066Sahrens if (minor == 0) /* This is the control device */ 857fa9e4066Sahrens return (0); 858fa9e4066Sahrens 859fa9e4066Sahrens mutex_enter(&zvol_state_lock); 860fa9e4066Sahrens 861fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 862fa9e4066Sahrens if (zv == NULL) { 863fa9e4066Sahrens mutex_exit(&zvol_state_lock); 864fa9e4066Sahrens return (ENXIO); 865fa9e4066Sahrens } 866fa9e4066Sahrens 867c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 868c7f714e2SEric Taylor ASSERT(zv->zv_total_opens == 1); 869c7f714e2SEric Taylor zv->zv_flags &= ~ZVOL_EXCL; 870fa9e4066Sahrens } 871fa9e4066Sahrens 872fa9e4066Sahrens /* 873fa9e4066Sahrens * If the open count is zero, this is a spurious close. 874fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 875fa9e4066Sahrens */ 876fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 877fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 878fa9e4066Sahrens 879fa9e4066Sahrens /* 880fa9e4066Sahrens * You may get multiple opens, but only one close. 881fa9e4066Sahrens */ 882fa9e4066Sahrens zv->zv_open_count[otyp]--; 883fa9e4066Sahrens zv->zv_total_opens--; 884fa9e4066Sahrens 885681d9761SEric Taylor if (zv->zv_total_opens == 0) 886681d9761SEric Taylor zvol_last_close(zv); 887fa9e4066Sahrens 888681d9761SEric Taylor mutex_exit(&zvol_state_lock); 889681d9761SEric Taylor return (error); 890fa9e4066Sahrens } 891fa9e4066Sahrens 892feb08c6bSbillm static void 893b24ab676SJeff Bonwick zvol_get_done(zgd_t *zgd, int error) 89467bd71c6Sperrin { 895b24ab676SJeff Bonwick if (zgd->zgd_db) 896b24ab676SJeff Bonwick dmu_buf_rele(zgd->zgd_db, zgd); 897b24ab676SJeff Bonwick 898b24ab676SJeff Bonwick zfs_range_unlock(zgd->zgd_rl); 899b24ab676SJeff Bonwick 900b24ab676SJeff Bonwick if (error == 0 && zgd->zgd_bp) 901b24ab676SJeff Bonwick zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 90267bd71c6Sperrin 90367bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 90467bd71c6Sperrin } 90567bd71c6Sperrin 90667bd71c6Sperrin /* 90767bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 90867bd71c6Sperrin */ 909feb08c6bSbillm static int 91067bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 91167bd71c6Sperrin { 91267bd71c6Sperrin zvol_state_t *zv = arg; 91367bd71c6Sperrin objset_t *os = zv->zv_objset; 914b24ab676SJeff Bonwick uint64_t object = ZVOL_OBJ; 915b24ab676SJeff Bonwick uint64_t offset = lr->lr_offset; 916b24ab676SJeff Bonwick uint64_t size = lr->lr_length; /* length of user data */ 917b24ab676SJeff Bonwick blkptr_t *bp = &lr->lr_blkptr; 91867bd71c6Sperrin dmu_buf_t *db; 91967bd71c6Sperrin zgd_t *zgd; 92067bd71c6Sperrin int error; 92167bd71c6Sperrin 922b24ab676SJeff Bonwick ASSERT(zio != NULL); 923b24ab676SJeff Bonwick ASSERT(size != 0); 924b24ab676SJeff Bonwick 925b24ab676SJeff Bonwick zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 926b24ab676SJeff Bonwick zgd->zgd_zilog = zv->zv_zilog; 927b24ab676SJeff Bonwick zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); 928feb08c6bSbillm 929c2e6a7d6Sperrin /* 930c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 931c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 932c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 933c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 934c2e6a7d6Sperrin * we don't have to write the data twice. 935c2e6a7d6Sperrin */ 936b24ab676SJeff Bonwick if (buf != NULL) { /* immediate write */ 937b24ab676SJeff Bonwick error = dmu_read(os, object, offset, size, buf, 938b24ab676SJeff Bonwick DMU_READ_NO_PREFETCH); 939b24ab676SJeff Bonwick } else { 940b24ab676SJeff Bonwick size = zv->zv_volblocksize; 941b24ab676SJeff Bonwick offset = P2ALIGN(offset, size); 942b24ab676SJeff Bonwick error = dmu_buf_hold(os, object, offset, zgd, &db); 943b24ab676SJeff Bonwick if (error == 0) { 944b24ab676SJeff Bonwick zgd->zgd_db = db; 945b24ab676SJeff Bonwick zgd->zgd_bp = bp; 94667bd71c6Sperrin 947b24ab676SJeff Bonwick ASSERT(db->db_offset == offset); 948b24ab676SJeff Bonwick ASSERT(db->db_size == size); 94967bd71c6Sperrin 950b24ab676SJeff Bonwick error = dmu_sync(zio, lr->lr_common.lrc_txg, 951b24ab676SJeff Bonwick zvol_get_done, zgd); 952975c32a0SNeil Perrin 953b24ab676SJeff Bonwick if (error == 0) 954b24ab676SJeff Bonwick return (0); 955b24ab676SJeff Bonwick } 956975c32a0SNeil Perrin } 957975c32a0SNeil Perrin 958b24ab676SJeff Bonwick zvol_get_done(zgd, error); 959b24ab676SJeff Bonwick 96067bd71c6Sperrin return (error); 96167bd71c6Sperrin } 96267bd71c6Sperrin 963a24e15ceSperrin /* 964a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 96522ac5be4Sperrin * 96622ac5be4Sperrin * We store data in the log buffers if it's small enough. 96767bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 96822ac5be4Sperrin */ 96967bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 97022ac5be4Sperrin 971feb08c6bSbillm static void 972510b6c0eSNeil Perrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 973510b6c0eSNeil Perrin boolean_t sync) 97422ac5be4Sperrin { 975feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 9761209a471SNeil Perrin zilog_t *zilog = zv->zv_zilog; 977510b6c0eSNeil Perrin boolean_t slogging; 978e09fa4daSNeil Perrin ssize_t immediate_write_sz; 979510b6c0eSNeil Perrin 980510b6c0eSNeil Perrin if (zil_disable) 981510b6c0eSNeil Perrin return; 98222ac5be4Sperrin 983b24ab676SJeff Bonwick if (zil_replaying(zilog, tx)) 9841209a471SNeil Perrin return; 9851209a471SNeil Perrin 986e09fa4daSNeil Perrin immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 987e09fa4daSNeil Perrin ? 0 : zvol_immediate_write_sz; 988e09fa4daSNeil Perrin 989e09fa4daSNeil Perrin slogging = spa_has_slogs(zilog->zl_spa) && 990e09fa4daSNeil Perrin (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); 991feb08c6bSbillm 992510b6c0eSNeil Perrin while (resid) { 993510b6c0eSNeil Perrin itx_t *itx; 994510b6c0eSNeil Perrin lr_write_t *lr; 995510b6c0eSNeil Perrin ssize_t len; 996510b6c0eSNeil Perrin itx_wr_state_t write_state; 997510b6c0eSNeil Perrin 998510b6c0eSNeil Perrin /* 999510b6c0eSNeil Perrin * Unlike zfs_log_write() we can be called with 1000510b6c0eSNeil Perrin * upto DMU_MAX_ACCESS/2 (5MB) writes. 1001510b6c0eSNeil Perrin */ 1002e09fa4daSNeil Perrin if (blocksize > immediate_write_sz && !slogging && 1003510b6c0eSNeil Perrin resid >= blocksize && off % blocksize == 0) { 1004510b6c0eSNeil Perrin write_state = WR_INDIRECT; /* uses dmu_sync */ 1005510b6c0eSNeil Perrin len = blocksize; 1006510b6c0eSNeil Perrin } else if (sync) { 1007510b6c0eSNeil Perrin write_state = WR_COPIED; 1008510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1009510b6c0eSNeil Perrin } else { 1010510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1011510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1012510b6c0eSNeil Perrin } 1013510b6c0eSNeil Perrin 1014510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1015510b6c0eSNeil Perrin (write_state == WR_COPIED ? len : 0)); 1016feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 1017510b6c0eSNeil Perrin if (write_state == WR_COPIED && dmu_read(zv->zv_objset, 10187bfdf011SNeil Perrin ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1019b24ab676SJeff Bonwick zil_itx_destroy(itx); 1020510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1021510b6c0eSNeil Perrin lr = (lr_write_t *)&itx->itx_lr; 1022510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1023510b6c0eSNeil Perrin } 1024510b6c0eSNeil Perrin 1025510b6c0eSNeil Perrin itx->itx_wr_state = write_state; 1026510b6c0eSNeil Perrin if (write_state == WR_NEED_COPY) 1027510b6c0eSNeil Perrin itx->itx_sod += len; 1028feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 1029feb08c6bSbillm lr->lr_offset = off; 1030510b6c0eSNeil Perrin lr->lr_length = len; 1031b24ab676SJeff Bonwick lr->lr_blkoff = 0; 1032feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 1033feb08c6bSbillm 1034510b6c0eSNeil Perrin itx->itx_private = zv; 1035510b6c0eSNeil Perrin itx->itx_sync = sync; 1036510b6c0eSNeil Perrin 10371209a471SNeil Perrin (void) zil_itx_assign(zilog, itx, tx); 1038510b6c0eSNeil Perrin 1039510b6c0eSNeil Perrin off += len; 1040510b6c0eSNeil Perrin resid -= len; 104122ac5be4Sperrin } 104222ac5be4Sperrin } 104322ac5be4Sperrin 104488b7b0f2SMatthew Ahrens static int 104588b7b0f2SMatthew Ahrens zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 104688b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1047e7cbe64fSgw { 1048e7cbe64fSgw vdev_disk_t *dvd; 1049e7cbe64fSgw int c; 1050e7cbe64fSgw int numerrors = 0; 1051e7cbe64fSgw 1052e7cbe64fSgw for (c = 0; c < vd->vdev_children; c++) { 105321ecdf64SLin Ling ASSERT(vd->vdev_ops == &vdev_mirror_ops || 105421ecdf64SLin Ling vd->vdev_ops == &vdev_replacing_ops || 105521ecdf64SLin Ling vd->vdev_ops == &vdev_spare_ops); 105688b7b0f2SMatthew Ahrens int err = zvol_dumpio_vdev(vd->vdev_child[c], 105788b7b0f2SMatthew Ahrens addr, offset, size, doread, isdump); 105888b7b0f2SMatthew Ahrens if (err != 0) { 1059e7cbe64fSgw numerrors++; 106088b7b0f2SMatthew Ahrens } else if (doread) { 1061e7cbe64fSgw break; 1062e7cbe64fSgw } 1063e7cbe64fSgw } 1064e7cbe64fSgw 1065e7cbe64fSgw if (!vd->vdev_ops->vdev_op_leaf) 1066e7cbe64fSgw return (numerrors < vd->vdev_children ? 0 : EIO); 1067e7cbe64fSgw 1068dc0bb255SEric Taylor if (doread && !vdev_readable(vd)) 1069dc0bb255SEric Taylor return (EIO); 1070dc0bb255SEric Taylor else if (!doread && !vdev_writeable(vd)) 1071e7cbe64fSgw return (EIO); 1072e7cbe64fSgw 1073e7cbe64fSgw dvd = vd->vdev_tsd; 1074e7cbe64fSgw ASSERT3P(dvd, !=, NULL); 1075e7cbe64fSgw offset += VDEV_LABEL_START_SIZE; 1076e7cbe64fSgw 1077e7cbe64fSgw if (ddi_in_panic() || isdump) { 107888b7b0f2SMatthew Ahrens ASSERT(!doread); 107988b7b0f2SMatthew Ahrens if (doread) 1080e7cbe64fSgw return (EIO); 1081e7cbe64fSgw return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1082e7cbe64fSgw lbtodb(size))); 1083e7cbe64fSgw } else { 1084e7cbe64fSgw return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 108588b7b0f2SMatthew Ahrens doread ? B_READ : B_WRITE)); 1086e7cbe64fSgw } 1087e7cbe64fSgw } 1088e7cbe64fSgw 108988b7b0f2SMatthew Ahrens static int 109088b7b0f2SMatthew Ahrens zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 109188b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1092e7cbe64fSgw { 1093e7cbe64fSgw vdev_t *vd; 1094e7cbe64fSgw int error; 109588b7b0f2SMatthew Ahrens zvol_extent_t *ze; 1096e7cbe64fSgw spa_t *spa = dmu_objset_spa(zv->zv_objset); 1097e7cbe64fSgw 109888b7b0f2SMatthew Ahrens /* Must be sector aligned, and not stradle a block boundary. */ 109988b7b0f2SMatthew Ahrens if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 110088b7b0f2SMatthew Ahrens P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1101e7cbe64fSgw return (EINVAL); 110288b7b0f2SMatthew Ahrens } 110388b7b0f2SMatthew Ahrens ASSERT(size <= zv->zv_volblocksize); 1104e7cbe64fSgw 110588b7b0f2SMatthew Ahrens /* Locate the extent this belongs to */ 110688b7b0f2SMatthew Ahrens ze = list_head(&zv->zv_extents); 110788b7b0f2SMatthew Ahrens while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 110888b7b0f2SMatthew Ahrens offset -= ze->ze_nblks * zv->zv_volblocksize; 110988b7b0f2SMatthew Ahrens ze = list_next(&zv->zv_extents, ze); 111088b7b0f2SMatthew Ahrens } 1111e14bb325SJeff Bonwick spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 111288b7b0f2SMatthew Ahrens vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 111388b7b0f2SMatthew Ahrens offset += DVA_GET_OFFSET(&ze->ze_dva); 111488b7b0f2SMatthew Ahrens error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 1115e14bb325SJeff Bonwick spa_config_exit(spa, SCL_STATE, FTAG); 1116e7cbe64fSgw return (error); 1117e7cbe64fSgw } 1118e7cbe64fSgw 1119fa9e4066Sahrens int 1120fa9e4066Sahrens zvol_strategy(buf_t *bp) 1121fa9e4066Sahrens { 1122fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 1123fa9e4066Sahrens uint64_t off, volsize; 112488b7b0f2SMatthew Ahrens size_t resid; 1125fa9e4066Sahrens char *addr; 112622ac5be4Sperrin objset_t *os; 1127c2e6a7d6Sperrin rl_t *rl; 1128fa9e4066Sahrens int error = 0; 112988b7b0f2SMatthew Ahrens boolean_t doread = bp->b_flags & B_READ; 113088b7b0f2SMatthew Ahrens boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 1131510b6c0eSNeil Perrin boolean_t sync; 1132fa9e4066Sahrens 1133fa9e4066Sahrens if (zv == NULL) { 1134fa9e4066Sahrens bioerror(bp, ENXIO); 1135fa9e4066Sahrens biodone(bp); 1136fa9e4066Sahrens return (0); 1137fa9e4066Sahrens } 1138fa9e4066Sahrens 1139fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 1140fa9e4066Sahrens bioerror(bp, EINVAL); 1141fa9e4066Sahrens biodone(bp); 1142fa9e4066Sahrens return (0); 1143fa9e4066Sahrens } 1144fa9e4066Sahrens 1145681d9761SEric Taylor if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1146fa9e4066Sahrens bioerror(bp, EROFS); 1147fa9e4066Sahrens biodone(bp); 1148fa9e4066Sahrens return (0); 1149fa9e4066Sahrens } 1150fa9e4066Sahrens 1151fa9e4066Sahrens off = ldbtob(bp->b_blkno); 1152fa9e4066Sahrens volsize = zv->zv_volsize; 1153fa9e4066Sahrens 115422ac5be4Sperrin os = zv->zv_objset; 115522ac5be4Sperrin ASSERT(os != NULL); 1156fa9e4066Sahrens 1157fa9e4066Sahrens bp_mapin(bp); 1158fa9e4066Sahrens addr = bp->b_un.b_addr; 1159fa9e4066Sahrens resid = bp->b_bcount; 1160fa9e4066Sahrens 116188b7b0f2SMatthew Ahrens if (resid > 0 && (off < 0 || off >= volsize)) { 116288b7b0f2SMatthew Ahrens bioerror(bp, EIO); 116388b7b0f2SMatthew Ahrens biodone(bp); 116488b7b0f2SMatthew Ahrens return (0); 116588b7b0f2SMatthew Ahrens } 116673ec3d9cSgw 1167510b6c0eSNeil Perrin sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump && 1168510b6c0eSNeil Perrin !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1169510b6c0eSNeil Perrin 1170a24e15ceSperrin /* 1171a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 1172a24e15ceSperrin * we can't change the data whilst calculating the checksum. 1173a24e15ceSperrin */ 1174c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 117588b7b0f2SMatthew Ahrens doread ? RL_READER : RL_WRITER); 1176fa9e4066Sahrens 1177e7cbe64fSgw while (resid != 0 && off < volsize) { 117888b7b0f2SMatthew Ahrens size_t size = MIN(resid, zvol_maxphys); 1179e7cbe64fSgw if (is_dump) { 1180e7cbe64fSgw size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 118188b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, off, size, 118288b7b0f2SMatthew Ahrens doread, B_FALSE); 118388b7b0f2SMatthew Ahrens } else if (doread) { 11847bfdf011SNeil Perrin error = dmu_read(os, ZVOL_OBJ, off, size, addr, 11857bfdf011SNeil Perrin DMU_READ_PREFETCH); 1186fa9e4066Sahrens } else { 118722ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 1188fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1189fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 1190fa9e4066Sahrens if (error) { 1191fa9e4066Sahrens dmu_tx_abort(tx); 1192fa9e4066Sahrens } else { 119322ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1194510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, size, sync); 1195fa9e4066Sahrens dmu_tx_commit(tx); 1196fa9e4066Sahrens } 1197fa9e4066Sahrens } 1198b87f3af3Sperrin if (error) { 1199b87f3af3Sperrin /* convert checksum errors into IO errors */ 1200b87f3af3Sperrin if (error == ECKSUM) 1201b87f3af3Sperrin error = EIO; 1202fa9e4066Sahrens break; 1203b87f3af3Sperrin } 1204fa9e4066Sahrens off += size; 1205fa9e4066Sahrens addr += size; 1206fa9e4066Sahrens resid -= size; 1207fa9e4066Sahrens } 1208c2e6a7d6Sperrin zfs_range_unlock(rl); 1209fa9e4066Sahrens 1210fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 1211fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 1212fa9e4066Sahrens 1213510b6c0eSNeil Perrin if (sync) 1214feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1215feb08c6bSbillm biodone(bp); 121622ac5be4Sperrin 1217fa9e4066Sahrens return (0); 1218fa9e4066Sahrens } 1219fa9e4066Sahrens 122067bd71c6Sperrin /* 122167bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 122267bd71c6Sperrin * Using our own routine instead of the default minphys() 122367bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 122467bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 122567bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 122667bd71c6Sperrin * 56K on X86 and 128K on sparc). 122767bd71c6Sperrin */ 122867bd71c6Sperrin void 122967bd71c6Sperrin zvol_minphys(struct buf *bp) 123067bd71c6Sperrin { 123167bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 123267bd71c6Sperrin bp->b_bcount = zvol_maxphys; 123367bd71c6Sperrin } 123467bd71c6Sperrin 1235e7cbe64fSgw int 1236e7cbe64fSgw zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1237e7cbe64fSgw { 1238e7cbe64fSgw minor_t minor = getminor(dev); 1239e7cbe64fSgw zvol_state_t *zv; 1240e7cbe64fSgw int error = 0; 1241e7cbe64fSgw uint64_t size; 1242e7cbe64fSgw uint64_t boff; 1243e7cbe64fSgw uint64_t resid; 1244e7cbe64fSgw 1245e7cbe64fSgw if (minor == 0) /* This is the control device */ 1246e7cbe64fSgw return (ENXIO); 1247e7cbe64fSgw 1248e7cbe64fSgw zv = ddi_get_soft_state(zvol_state, minor); 1249e7cbe64fSgw if (zv == NULL) 1250e7cbe64fSgw return (ENXIO); 1251e7cbe64fSgw 1252e7cbe64fSgw boff = ldbtob(blkno); 1253e7cbe64fSgw resid = ldbtob(nblocks); 125488b7b0f2SMatthew Ahrens 125588b7b0f2SMatthew Ahrens VERIFY3U(boff + resid, <=, zv->zv_volsize); 125688b7b0f2SMatthew Ahrens 1257e7cbe64fSgw while (resid) { 1258e7cbe64fSgw size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 125988b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1260e7cbe64fSgw if (error) 1261e7cbe64fSgw break; 1262e7cbe64fSgw boff += size; 1263e7cbe64fSgw addr += size; 1264e7cbe64fSgw resid -= size; 1265e7cbe64fSgw } 1266e7cbe64fSgw 1267e7cbe64fSgw return (error); 1268e7cbe64fSgw } 1269e7cbe64fSgw 1270fa9e4066Sahrens /*ARGSUSED*/ 1271fa9e4066Sahrens int 1272feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1273fa9e4066Sahrens { 1274c7ca1008Sgw minor_t minor = getminor(dev); 1275c7ca1008Sgw zvol_state_t *zv; 127673ec3d9cSgw uint64_t volsize; 1277c2e6a7d6Sperrin rl_t *rl; 1278feb08c6bSbillm int error = 0; 1279fa9e4066Sahrens 1280c7ca1008Sgw if (minor == 0) /* This is the control device */ 1281c7ca1008Sgw return (ENXIO); 1282c7ca1008Sgw 1283c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1284c7ca1008Sgw if (zv == NULL) 1285c7ca1008Sgw return (ENXIO); 1286c7ca1008Sgw 128773ec3d9cSgw volsize = zv->zv_volsize; 128873ec3d9cSgw if (uio->uio_resid > 0 && 128973ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 129073ec3d9cSgw return (EIO); 129173ec3d9cSgw 129288b7b0f2SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 129388b7b0f2SMatthew Ahrens error = physio(zvol_strategy, NULL, dev, B_READ, 129488b7b0f2SMatthew Ahrens zvol_minphys, uio); 129588b7b0f2SMatthew Ahrens return (error); 129688b7b0f2SMatthew Ahrens } 129788b7b0f2SMatthew Ahrens 1298c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1299c2e6a7d6Sperrin RL_READER); 130073ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1301feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1302fa9e4066Sahrens 130373ec3d9cSgw /* don't read past the end */ 130473ec3d9cSgw if (bytes > volsize - uio->uio_loffset) 130573ec3d9cSgw bytes = volsize - uio->uio_loffset; 130673ec3d9cSgw 1307feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1308b87f3af3Sperrin if (error) { 1309b87f3af3Sperrin /* convert checksum errors into IO errors */ 1310b87f3af3Sperrin if (error == ECKSUM) 1311b87f3af3Sperrin error = EIO; 1312feb08c6bSbillm break; 1313b87f3af3Sperrin } 1314feb08c6bSbillm } 1315c2e6a7d6Sperrin zfs_range_unlock(rl); 1316feb08c6bSbillm return (error); 1317fa9e4066Sahrens } 1318fa9e4066Sahrens 1319fa9e4066Sahrens /*ARGSUSED*/ 1320fa9e4066Sahrens int 1321feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1322fa9e4066Sahrens { 1323c7ca1008Sgw minor_t minor = getminor(dev); 1324c7ca1008Sgw zvol_state_t *zv; 132573ec3d9cSgw uint64_t volsize; 1326c2e6a7d6Sperrin rl_t *rl; 1327feb08c6bSbillm int error = 0; 1328510b6c0eSNeil Perrin boolean_t sync; 1329feb08c6bSbillm 1330c7ca1008Sgw if (minor == 0) /* This is the control device */ 1331c7ca1008Sgw return (ENXIO); 1332c7ca1008Sgw 1333c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1334c7ca1008Sgw if (zv == NULL) 1335c7ca1008Sgw return (ENXIO); 1336c7ca1008Sgw 133773ec3d9cSgw volsize = zv->zv_volsize; 133873ec3d9cSgw if (uio->uio_resid > 0 && 133973ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 134073ec3d9cSgw return (EIO); 134173ec3d9cSgw 1342e7cbe64fSgw if (zv->zv_flags & ZVOL_DUMPIFIED) { 1343e7cbe64fSgw error = physio(zvol_strategy, NULL, dev, B_WRITE, 1344e7cbe64fSgw zvol_minphys, uio); 1345e7cbe64fSgw return (error); 1346e7cbe64fSgw } 1347e7cbe64fSgw 1348510b6c0eSNeil Perrin sync = !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1349510b6c0eSNeil Perrin 1350c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1351c2e6a7d6Sperrin RL_WRITER); 135273ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1353feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1354feb08c6bSbillm uint64_t off = uio->uio_loffset; 1355feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 135673ec3d9cSgw 135773ec3d9cSgw if (bytes > volsize - off) /* don't write past the end */ 135873ec3d9cSgw bytes = volsize - off; 135973ec3d9cSgw 1360feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1361feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 1362feb08c6bSbillm if (error) { 1363feb08c6bSbillm dmu_tx_abort(tx); 1364feb08c6bSbillm break; 1365feb08c6bSbillm } 1366feb08c6bSbillm error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); 1367feb08c6bSbillm if (error == 0) 1368510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, bytes, sync); 1369feb08c6bSbillm dmu_tx_commit(tx); 1370feb08c6bSbillm 1371feb08c6bSbillm if (error) 1372feb08c6bSbillm break; 1373feb08c6bSbillm } 1374c2e6a7d6Sperrin zfs_range_unlock(rl); 1375510b6c0eSNeil Perrin if (sync) 1376e08bf2c6SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1377feb08c6bSbillm return (error); 1378fa9e4066Sahrens } 1379fa9e4066Sahrens 1380c7f714e2SEric Taylor int 1381c7f714e2SEric Taylor zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1382c7f714e2SEric Taylor { 1383c7f714e2SEric Taylor struct uuid uuid = EFI_RESERVED; 1384c7f714e2SEric Taylor efi_gpe_t gpe = { 0 }; 1385c7f714e2SEric Taylor uint32_t crc; 1386c7f714e2SEric Taylor dk_efi_t efi; 1387c7f714e2SEric Taylor int length; 1388c7f714e2SEric Taylor char *ptr; 1389c7f714e2SEric Taylor 1390c7f714e2SEric Taylor if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1391c7f714e2SEric Taylor return (EFAULT); 1392c7f714e2SEric Taylor ptr = (char *)(uintptr_t)efi.dki_data_64; 1393c7f714e2SEric Taylor length = efi.dki_length; 1394c7f714e2SEric Taylor /* 1395c7f714e2SEric Taylor * Some clients may attempt to request a PMBR for the 1396c7f714e2SEric Taylor * zvol. Currently this interface will return EINVAL to 1397c7f714e2SEric Taylor * such requests. These requests could be supported by 1398c7f714e2SEric Taylor * adding a check for lba == 0 and consing up an appropriate 1399c7f714e2SEric Taylor * PMBR. 1400c7f714e2SEric Taylor */ 1401c7f714e2SEric Taylor if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1402c7f714e2SEric Taylor return (EINVAL); 1403c7f714e2SEric Taylor 1404c7f714e2SEric Taylor gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1405c7f714e2SEric Taylor gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1406c7f714e2SEric Taylor UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1407c7f714e2SEric Taylor 1408c7f714e2SEric Taylor if (efi.dki_lba == 1) { 1409c7f714e2SEric Taylor efi_gpt_t gpt = { 0 }; 1410c7f714e2SEric Taylor 1411c7f714e2SEric Taylor gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1412c7f714e2SEric Taylor gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1413c7f714e2SEric Taylor gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1414c7f714e2SEric Taylor gpt.efi_gpt_MyLBA = LE_64(1ULL); 1415c7f714e2SEric Taylor gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1416c7f714e2SEric Taylor gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1417c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1418c7f714e2SEric Taylor gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1419c7f714e2SEric Taylor gpt.efi_gpt_SizeOfPartitionEntry = 1420c7f714e2SEric Taylor LE_32(sizeof (efi_gpe_t)); 1421c7f714e2SEric Taylor CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1422c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1423c7f714e2SEric Taylor CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1424c7f714e2SEric Taylor gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1425c7f714e2SEric Taylor if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1426c7f714e2SEric Taylor flag)) 1427c7f714e2SEric Taylor return (EFAULT); 1428c7f714e2SEric Taylor ptr += sizeof (gpt); 1429c7f714e2SEric Taylor length -= sizeof (gpt); 1430c7f714e2SEric Taylor } 1431c7f714e2SEric Taylor if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1432c7f714e2SEric Taylor length), flag)) 1433c7f714e2SEric Taylor return (EFAULT); 1434c7f714e2SEric Taylor return (0); 1435c7f714e2SEric Taylor } 1436c7f714e2SEric Taylor 1437fa9e4066Sahrens /* 1438fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1439fa9e4066Sahrens */ 1440fa9e4066Sahrens /*ARGSUSED*/ 1441fa9e4066Sahrens int 1442fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1443fa9e4066Sahrens { 1444fa9e4066Sahrens zvol_state_t *zv; 1445af2c4821Smaybee struct dk_cinfo dki; 1446fa9e4066Sahrens struct dk_minfo dkm; 1447af2c4821Smaybee struct dk_callback *dkc; 1448fa9e4066Sahrens int error = 0; 1449e7cbe64fSgw rl_t *rl; 1450fa9e4066Sahrens 1451fa9e4066Sahrens mutex_enter(&zvol_state_lock); 1452fa9e4066Sahrens 1453fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 1454fa9e4066Sahrens 1455fa9e4066Sahrens if (zv == NULL) { 1456fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1457fa9e4066Sahrens return (ENXIO); 1458fa9e4066Sahrens } 1459701f66c4SEric Taylor ASSERT(zv->zv_total_opens > 0); 1460fa9e4066Sahrens 1461fa9e4066Sahrens switch (cmd) { 1462fa9e4066Sahrens 1463fa9e4066Sahrens case DKIOCINFO: 1464af2c4821Smaybee bzero(&dki, sizeof (dki)); 1465af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1466af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1467af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 1468af2c4821Smaybee dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1469fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1470af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1471fa9e4066Sahrens error = EFAULT; 1472fa9e4066Sahrens return (error); 1473fa9e4066Sahrens 1474fa9e4066Sahrens case DKIOCGMEDIAINFO: 1475fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1476fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1477fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1478fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1479fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1480fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1481fa9e4066Sahrens error = EFAULT; 1482fa9e4066Sahrens return (error); 1483fa9e4066Sahrens 1484fa9e4066Sahrens case DKIOCGETEFI: 1485c7f714e2SEric Taylor { 1486c7f714e2SEric Taylor uint64_t vs = zv->zv_volsize; 1487c7f714e2SEric Taylor uint8_t bs = zv->zv_min_bs; 1488fa9e4066Sahrens 148968a5ac4dSmaybee mutex_exit(&zvol_state_lock); 1490c7f714e2SEric Taylor error = zvol_getefi((void *)arg, flag, vs, bs); 1491c7f714e2SEric Taylor return (error); 149268a5ac4dSmaybee } 1493fa9e4066Sahrens 1494feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1495af2c4821Smaybee dkc = (struct dk_callback *)arg; 1496701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1497feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1498af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1499af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1500af2c4821Smaybee error = 0; 1501af2c4821Smaybee } 1502701f66c4SEric Taylor return (error); 1503701f66c4SEric Taylor 1504701f66c4SEric Taylor case DKIOCGETWCE: 1505701f66c4SEric Taylor { 1506701f66c4SEric Taylor int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1507701f66c4SEric Taylor if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1508701f66c4SEric Taylor flag)) 1509701f66c4SEric Taylor error = EFAULT; 1510701f66c4SEric Taylor break; 1511701f66c4SEric Taylor } 1512701f66c4SEric Taylor case DKIOCSETWCE: 1513701f66c4SEric Taylor { 1514701f66c4SEric Taylor int wce; 1515701f66c4SEric Taylor if (ddi_copyin((void *)arg, &wce, sizeof (int), 1516701f66c4SEric Taylor flag)) { 1517701f66c4SEric Taylor error = EFAULT; 1518701f66c4SEric Taylor break; 1519701f66c4SEric Taylor } 1520701f66c4SEric Taylor if (wce) { 1521701f66c4SEric Taylor zv->zv_flags |= ZVOL_WCE; 1522701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1523701f66c4SEric Taylor } else { 1524701f66c4SEric Taylor zv->zv_flags &= ~ZVOL_WCE; 1525701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1526701f66c4SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1527701f66c4SEric Taylor } 1528701f66c4SEric Taylor return (0); 1529701f66c4SEric Taylor } 1530feb08c6bSbillm 1531b6130eadSmaybee case DKIOCGGEOM: 1532b6130eadSmaybee case DKIOCGVTOC: 1533e7cbe64fSgw /* 1534e7cbe64fSgw * commands using these (like prtvtoc) expect ENOTSUP 1535e7cbe64fSgw * since we're emulating an EFI label 1536e7cbe64fSgw */ 1537b6130eadSmaybee error = ENOTSUP; 1538b6130eadSmaybee break; 1539b6130eadSmaybee 1540e7cbe64fSgw case DKIOCDUMPINIT: 1541e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1542e7cbe64fSgw RL_WRITER); 1543e7cbe64fSgw error = zvol_dumpify(zv); 1544e7cbe64fSgw zfs_range_unlock(rl); 1545e7cbe64fSgw break; 1546e7cbe64fSgw 1547e7cbe64fSgw case DKIOCDUMPFINI: 154806d5ae10SEric Taylor if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 154906d5ae10SEric Taylor break; 1550e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1551e7cbe64fSgw RL_WRITER); 1552e7cbe64fSgw error = zvol_dump_fini(zv); 1553e7cbe64fSgw zfs_range_unlock(rl); 1554e7cbe64fSgw break; 1555e7cbe64fSgw 1556fa9e4066Sahrens default: 155768a5ac4dSmaybee error = ENOTTY; 1558fa9e4066Sahrens break; 1559fa9e4066Sahrens 1560fa9e4066Sahrens } 1561fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1562fa9e4066Sahrens return (error); 1563fa9e4066Sahrens } 1564fa9e4066Sahrens 1565fa9e4066Sahrens int 1566fa9e4066Sahrens zvol_busy(void) 1567fa9e4066Sahrens { 1568fa9e4066Sahrens return (zvol_minors != 0); 1569fa9e4066Sahrens } 1570fa9e4066Sahrens 1571fa9e4066Sahrens void 1572fa9e4066Sahrens zvol_init(void) 1573fa9e4066Sahrens { 1574fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1575fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1576fa9e4066Sahrens } 1577fa9e4066Sahrens 1578fa9e4066Sahrens void 1579fa9e4066Sahrens zvol_fini(void) 1580fa9e4066Sahrens { 1581fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1582fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1583fa9e4066Sahrens } 1584e7cbe64fSgw 1585e7cbe64fSgw static int 1586e7cbe64fSgw zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1587e7cbe64fSgw { 1588e7cbe64fSgw dmu_tx_t *tx; 1589e7cbe64fSgw int error = 0; 1590e7cbe64fSgw objset_t *os = zv->zv_objset; 1591e7cbe64fSgw nvlist_t *nv = NULL; 1592e7cbe64fSgw 1593e7cbe64fSgw ASSERT(MUTEX_HELD(&zvol_state_lock)); 1594681d9761SEric Taylor error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1595681d9761SEric Taylor DMU_OBJECT_END); 1596681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1597681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1598e7cbe64fSgw 1599e7cbe64fSgw tx = dmu_tx_create(os); 1600e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1601681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1602e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1603e7cbe64fSgw if (error) { 1604e7cbe64fSgw dmu_tx_abort(tx); 1605e7cbe64fSgw return (error); 1606e7cbe64fSgw } 1607e7cbe64fSgw 1608e7cbe64fSgw /* 1609e7cbe64fSgw * If we are resizing the dump device then we only need to 1610e7cbe64fSgw * update the refreservation to match the newly updated 1611e7cbe64fSgw * zvolsize. Otherwise, we save off the original state of the 1612e7cbe64fSgw * zvol so that we can restore them if the zvol is ever undumpified. 1613e7cbe64fSgw */ 1614e7cbe64fSgw if (resize) { 1615e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, 1616e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1617e7cbe64fSgw &zv->zv_volsize, tx); 1618e7cbe64fSgw } else { 161988b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 162088b7b0f2SMatthew Ahrens 1621e7cbe64fSgw error = dsl_prop_get_integer(zv->zv_name, 1622e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1623e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1624e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1625e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1626e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 162788b7b0f2SMatthew Ahrens error = error ? error : dsl_prop_get_integer(zv->zv_name, 162888b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 1629e7cbe64fSgw 1630e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1631e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1632e7cbe64fSgw &compress, tx); 1633e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1634e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1635e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1636e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1637e7cbe64fSgw &refresrv, tx); 163888b7b0f2SMatthew Ahrens error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 163988b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 164088b7b0f2SMatthew Ahrens &vbs, tx); 1641681d9761SEric Taylor error = error ? error : dmu_object_set_blocksize( 1642681d9761SEric Taylor os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx); 1643681d9761SEric Taylor if (error == 0) 1644681d9761SEric Taylor zv->zv_volblocksize = SPA_MAXBLOCKSIZE; 1645e7cbe64fSgw } 1646e7cbe64fSgw dmu_tx_commit(tx); 1647e7cbe64fSgw 1648e7cbe64fSgw /* 1649e7cbe64fSgw * We only need update the zvol's property if we are initializing 1650e7cbe64fSgw * the dump area for the first time. 1651e7cbe64fSgw */ 1652e7cbe64fSgw if (!resize) { 1653e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1654e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1655e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1656e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1657e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1658e7cbe64fSgw ZIO_COMPRESS_OFF) == 0); 1659e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1660e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1661e7cbe64fSgw ZIO_CHECKSUM_OFF) == 0); 1662e7cbe64fSgw 1663*92241e0bSTom Erickson error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 1664*92241e0bSTom Erickson nv, NULL); 1665e7cbe64fSgw nvlist_free(nv); 1666e7cbe64fSgw 1667e7cbe64fSgw if (error) 1668e7cbe64fSgw return (error); 1669e7cbe64fSgw } 1670e7cbe64fSgw 1671e7cbe64fSgw /* Allocate the space for the dump */ 1672e7cbe64fSgw error = zvol_prealloc(zv); 1673e7cbe64fSgw return (error); 1674e7cbe64fSgw } 1675e7cbe64fSgw 1676e7cbe64fSgw static int 1677e7cbe64fSgw zvol_dumpify(zvol_state_t *zv) 1678e7cbe64fSgw { 1679e7cbe64fSgw int error = 0; 1680e7cbe64fSgw uint64_t dumpsize = 0; 1681e7cbe64fSgw dmu_tx_t *tx; 1682e7cbe64fSgw objset_t *os = zv->zv_objset; 1683e7cbe64fSgw 1684681d9761SEric Taylor if (zv->zv_flags & ZVOL_RDONLY) 1685e7cbe64fSgw return (EROFS); 1686e7cbe64fSgw 1687e7cbe64fSgw if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1688e7cbe64fSgw 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 1689e7cbe64fSgw boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; 1690e7cbe64fSgw 1691e7cbe64fSgw if ((error = zvol_dump_init(zv, resize)) != 0) { 1692e7cbe64fSgw (void) zvol_dump_fini(zv); 1693e7cbe64fSgw return (error); 1694e7cbe64fSgw } 1695e7cbe64fSgw } 1696e7cbe64fSgw 1697e7cbe64fSgw /* 1698e7cbe64fSgw * Build up our lba mapping. 1699e7cbe64fSgw */ 1700e7cbe64fSgw error = zvol_get_lbas(zv); 1701e7cbe64fSgw if (error) { 1702e7cbe64fSgw (void) zvol_dump_fini(zv); 1703e7cbe64fSgw return (error); 1704e7cbe64fSgw } 1705e7cbe64fSgw 1706e7cbe64fSgw tx = dmu_tx_create(os); 1707e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1708e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1709e7cbe64fSgw if (error) { 1710e7cbe64fSgw dmu_tx_abort(tx); 1711e7cbe64fSgw (void) zvol_dump_fini(zv); 1712e7cbe64fSgw return (error); 1713e7cbe64fSgw } 1714e7cbe64fSgw 1715e7cbe64fSgw zv->zv_flags |= ZVOL_DUMPIFIED; 1716e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1717e7cbe64fSgw &zv->zv_volsize, tx); 1718e7cbe64fSgw dmu_tx_commit(tx); 1719e7cbe64fSgw 1720e7cbe64fSgw if (error) { 1721e7cbe64fSgw (void) zvol_dump_fini(zv); 1722e7cbe64fSgw return (error); 1723e7cbe64fSgw } 1724e7cbe64fSgw 1725e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 1726e7cbe64fSgw return (0); 1727e7cbe64fSgw } 1728e7cbe64fSgw 1729e7cbe64fSgw static int 1730e7cbe64fSgw zvol_dump_fini(zvol_state_t *zv) 1731e7cbe64fSgw { 1732e7cbe64fSgw dmu_tx_t *tx; 1733e7cbe64fSgw objset_t *os = zv->zv_objset; 1734e7cbe64fSgw nvlist_t *nv; 1735e7cbe64fSgw int error = 0; 173688b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 1737e7cbe64fSgw 1738b7e50089Smaybee /* 1739b7e50089Smaybee * Attempt to restore the zvol back to its pre-dumpified state. 1740b7e50089Smaybee * This is a best-effort attempt as it's possible that not all 1741b7e50089Smaybee * of these properties were initialized during the dumpify process 1742b7e50089Smaybee * (i.e. error during zvol_dump_init). 1743b7e50089Smaybee */ 1744b7e50089Smaybee 1745e7cbe64fSgw tx = dmu_tx_create(os); 1746e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1747e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1748e7cbe64fSgw if (error) { 1749e7cbe64fSgw dmu_tx_abort(tx); 1750e7cbe64fSgw return (error); 1751e7cbe64fSgw } 1752b7e50089Smaybee (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1753b7e50089Smaybee dmu_tx_commit(tx); 1754e7cbe64fSgw 1755e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1756e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1757e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1758e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1759e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1760e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 176188b7b0f2SMatthew Ahrens (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 176288b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1763e7cbe64fSgw 1764e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1765e7cbe64fSgw (void) nvlist_add_uint64(nv, 1766e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1767e7cbe64fSgw (void) nvlist_add_uint64(nv, 1768e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1769e7cbe64fSgw (void) nvlist_add_uint64(nv, 1770e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 1771*92241e0bSTom Erickson (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 1772*92241e0bSTom Erickson nv, NULL); 1773e7cbe64fSgw nvlist_free(nv); 1774e7cbe64fSgw 1775b7e50089Smaybee zvol_free_extents(zv); 1776b7e50089Smaybee zv->zv_flags &= ~ZVOL_DUMPIFIED; 1777b7e50089Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 1778681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1779681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1780681d9761SEric Taylor tx = dmu_tx_create(os); 1781681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1782681d9761SEric Taylor error = dmu_tx_assign(tx, TXG_WAIT); 1783681d9761SEric Taylor if (error) { 1784681d9761SEric Taylor dmu_tx_abort(tx); 1785681d9761SEric Taylor return (error); 1786681d9761SEric Taylor } 1787b24ab676SJeff Bonwick if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 1788b24ab676SJeff Bonwick zv->zv_volblocksize = vbs; 1789681d9761SEric Taylor dmu_tx_commit(tx); 1790b7e50089Smaybee 1791e7cbe64fSgw return (0); 1792e7cbe64fSgw } 1793