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 * 35fa9e4066Sahrens * These links are created by the ZFS-specific devfsadm link generator. 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; 83fa9e4066Sahrens 84e7cbe64fSgw #define ZVOL_DUMPSIZE "dumpsize" 85e7cbe64fSgw 86fa9e4066Sahrens /* 87fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 88fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 89fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 90fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 91fa9e4066Sahrens */ 92fa9e4066Sahrens static kmutex_t zvol_state_lock; 93fa9e4066Sahrens static uint32_t zvol_minors; 94fa9e4066Sahrens 95e7cbe64fSgw typedef struct zvol_extent { 9688b7b0f2SMatthew Ahrens list_node_t ze_node; 97e7cbe64fSgw dva_t ze_dva; /* dva associated with this extent */ 9888b7b0f2SMatthew Ahrens uint64_t ze_nblks; /* number of blocks in extent */ 99e7cbe64fSgw } zvol_extent_t; 100e7cbe64fSgw 101fa9e4066Sahrens /* 102fa9e4066Sahrens * The in-core state of each volume. 103fa9e4066Sahrens */ 104fa9e4066Sahrens typedef struct zvol_state { 105fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 106fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 10767bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 108fa9e4066Sahrens minor_t zv_minor; /* minor number */ 109fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 110*701f66c4SEric Taylor uint8_t zv_flags; /* readonly, dumpified, etc. */ 111fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 112fa9e4066Sahrens uint32_t zv_mode; /* DS_MODE_* flags at open time */ 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 126*701f66c4SEric 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 133e7cbe64fSgw extern int zfs_set_prop_nvlist(const char *, nvlist_t *); 134feb08c6bSbillm static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 135e7cbe64fSgw static int zvol_dumpify(zvol_state_t *zv); 136e7cbe64fSgw static int zvol_dump_fini(zvol_state_t *zv); 137e7cbe64fSgw static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 13867bd71c6Sperrin 139fa9e4066Sahrens static void 14091ebeef5Sahrens zvol_size_changed(zvol_state_t *zv, major_t maj) 141fa9e4066Sahrens { 14291ebeef5Sahrens dev_t dev = makedevice(maj, zv->zv_minor); 143fa9e4066Sahrens 144fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 145fa9e4066Sahrens "Size", zv->zv_volsize) == DDI_SUCCESS); 146fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 147fa9e4066Sahrens "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); 148e7cbe64fSgw 149e7cbe64fSgw /* Notify specfs to invalidate the cached size */ 150e7cbe64fSgw spec_size_invalidate(dev, VBLK); 151e7cbe64fSgw spec_size_invalidate(dev, VCHR); 152fa9e4066Sahrens } 153fa9e4066Sahrens 154fa9e4066Sahrens int 155e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 156fa9e4066Sahrens { 157e9dbad6fSeschrock if (volsize == 0) 158fa9e4066Sahrens return (EINVAL); 159fa9e4066Sahrens 160e9dbad6fSeschrock if (volsize % blocksize != 0) 1615c5460e9Seschrock return (EINVAL); 1625c5460e9Seschrock 163fa9e4066Sahrens #ifdef _ILP32 164e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 165fa9e4066Sahrens return (EOVERFLOW); 166fa9e4066Sahrens #endif 167fa9e4066Sahrens return (0); 168fa9e4066Sahrens } 169fa9e4066Sahrens 170fa9e4066Sahrens int 171e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 172fa9e4066Sahrens { 173e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 174e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 175e9dbad6fSeschrock !ISP2(volblocksize)) 176fa9e4066Sahrens return (EDOM); 177fa9e4066Sahrens 178fa9e4066Sahrens return (0); 179fa9e4066Sahrens } 180fa9e4066Sahrens 181fa9e4066Sahrens static void 182fa9e4066Sahrens zvol_readonly_changed_cb(void *arg, uint64_t newval) 183fa9e4066Sahrens { 184fa9e4066Sahrens zvol_state_t *zv = arg; 185fa9e4066Sahrens 186e7cbe64fSgw if (newval) 187e7cbe64fSgw zv->zv_flags |= ZVOL_RDONLY; 188e7cbe64fSgw else 189e7cbe64fSgw zv->zv_flags &= ~ZVOL_RDONLY; 190fa9e4066Sahrens } 191fa9e4066Sahrens 192fa9e4066Sahrens int 193a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 194fa9e4066Sahrens { 195fa9e4066Sahrens int error; 196fa9e4066Sahrens dmu_object_info_t doi; 197a2eea2e1Sahrens uint64_t val; 198fa9e4066Sahrens 199fa9e4066Sahrens 200a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 201fa9e4066Sahrens if (error) 202fa9e4066Sahrens return (error); 203fa9e4066Sahrens 204a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 205a2eea2e1Sahrens 206fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 207fa9e4066Sahrens 208a2eea2e1Sahrens if (error == 0) { 209a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 210a2eea2e1Sahrens doi.doi_data_block_size); 211a2eea2e1Sahrens } 212fa9e4066Sahrens 213fa9e4066Sahrens return (error); 214fa9e4066Sahrens } 215fa9e4066Sahrens 216fa9e4066Sahrens /* 217fa9e4066Sahrens * Find a free minor number. 218fa9e4066Sahrens */ 219fa9e4066Sahrens static minor_t 220fa9e4066Sahrens zvol_minor_alloc(void) 221fa9e4066Sahrens { 222fa9e4066Sahrens minor_t minor; 223fa9e4066Sahrens 224fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 225fa9e4066Sahrens 226fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 227fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 228fa9e4066Sahrens return (minor); 229fa9e4066Sahrens 230fa9e4066Sahrens return (0); 231fa9e4066Sahrens } 232fa9e4066Sahrens 233fa9e4066Sahrens static zvol_state_t * 234e9dbad6fSeschrock zvol_minor_lookup(const char *name) 235fa9e4066Sahrens { 236fa9e4066Sahrens minor_t minor; 237fa9e4066Sahrens zvol_state_t *zv; 238fa9e4066Sahrens 239fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 240fa9e4066Sahrens 241fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 242fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 243fa9e4066Sahrens if (zv == NULL) 244fa9e4066Sahrens continue; 245fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 246fa9e4066Sahrens break; 247fa9e4066Sahrens } 248fa9e4066Sahrens 249fa9e4066Sahrens return (zv); 250fa9e4066Sahrens } 251fa9e4066Sahrens 252e7cbe64fSgw /* extent mapping arg */ 253e7cbe64fSgw struct maparg { 25488b7b0f2SMatthew Ahrens zvol_state_t *ma_zv; 25588b7b0f2SMatthew Ahrens uint64_t ma_blks; 256e7cbe64fSgw }; 257e7cbe64fSgw 258e7cbe64fSgw /*ARGSUSED*/ 259e7cbe64fSgw static int 26088b7b0f2SMatthew Ahrens zvol_map_block(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb, 26188b7b0f2SMatthew Ahrens const dnode_phys_t *dnp, void *arg) 262e7cbe64fSgw { 26388b7b0f2SMatthew Ahrens struct maparg *ma = arg; 26488b7b0f2SMatthew Ahrens zvol_extent_t *ze; 26588b7b0f2SMatthew Ahrens int bs = ma->ma_zv->zv_volblocksize; 266e7cbe64fSgw 26788b7b0f2SMatthew Ahrens if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 26888b7b0f2SMatthew Ahrens return (0); 269e7cbe64fSgw 27088b7b0f2SMatthew Ahrens VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 27188b7b0f2SMatthew Ahrens ma->ma_blks++; 272e7cbe64fSgw 27388b7b0f2SMatthew Ahrens /* Abort immediately if we have encountered gang blocks */ 27488b7b0f2SMatthew Ahrens if (BP_IS_GANG(bp)) 27588b7b0f2SMatthew Ahrens return (EFRAGS); 276e7cbe64fSgw 27788b7b0f2SMatthew Ahrens /* 27888b7b0f2SMatthew Ahrens * See if the block is at the end of the previous extent. 27988b7b0f2SMatthew Ahrens */ 28088b7b0f2SMatthew Ahrens ze = list_tail(&ma->ma_zv->zv_extents); 28188b7b0f2SMatthew Ahrens if (ze && 28288b7b0f2SMatthew Ahrens DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 28388b7b0f2SMatthew Ahrens DVA_GET_OFFSET(BP_IDENTITY(bp)) == 28488b7b0f2SMatthew Ahrens DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 28588b7b0f2SMatthew Ahrens ze->ze_nblks++; 28688b7b0f2SMatthew Ahrens return (0); 287e7cbe64fSgw } 288e7cbe64fSgw 28988b7b0f2SMatthew Ahrens dprintf_bp(bp, "%s", "next blkptr:"); 290e7cbe64fSgw 29188b7b0f2SMatthew Ahrens /* start a new extent */ 29288b7b0f2SMatthew Ahrens ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 29388b7b0f2SMatthew Ahrens ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 29488b7b0f2SMatthew Ahrens ze->ze_nblks = 1; 29588b7b0f2SMatthew Ahrens list_insert_tail(&ma->ma_zv->zv_extents, ze); 29688b7b0f2SMatthew Ahrens return (0); 29788b7b0f2SMatthew Ahrens } 298e7cbe64fSgw 29988b7b0f2SMatthew Ahrens static void 30088b7b0f2SMatthew Ahrens zvol_free_extents(zvol_state_t *zv) 30188b7b0f2SMatthew Ahrens { 30288b7b0f2SMatthew Ahrens zvol_extent_t *ze; 303e7cbe64fSgw 30488b7b0f2SMatthew Ahrens while (ze = list_head(&zv->zv_extents)) { 30588b7b0f2SMatthew Ahrens list_remove(&zv->zv_extents, ze); 30688b7b0f2SMatthew Ahrens kmem_free(ze, sizeof (zvol_extent_t)); 307e7cbe64fSgw } 30888b7b0f2SMatthew Ahrens } 309e7cbe64fSgw 31088b7b0f2SMatthew Ahrens static int 31188b7b0f2SMatthew Ahrens zvol_get_lbas(zvol_state_t *zv) 31288b7b0f2SMatthew Ahrens { 31388b7b0f2SMatthew Ahrens struct maparg ma; 31488b7b0f2SMatthew Ahrens int err; 31588b7b0f2SMatthew Ahrens 31688b7b0f2SMatthew Ahrens ma.ma_zv = zv; 31788b7b0f2SMatthew Ahrens ma.ma_blks = 0; 31888b7b0f2SMatthew Ahrens zvol_free_extents(zv); 31988b7b0f2SMatthew Ahrens 32088b7b0f2SMatthew Ahrens err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0, 32188b7b0f2SMatthew Ahrens TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 32288b7b0f2SMatthew Ahrens if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 32388b7b0f2SMatthew Ahrens zvol_free_extents(zv); 32488b7b0f2SMatthew Ahrens return (err ? err : EIO); 325e7cbe64fSgw } 32688b7b0f2SMatthew Ahrens 327e7cbe64fSgw return (0); 328e7cbe64fSgw } 329e7cbe64fSgw 330ecd6cf80Smarks /* ARGSUSED */ 331fa9e4066Sahrens void 332ecd6cf80Smarks zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 333fa9e4066Sahrens { 334da6c28aaSamw zfs_creat_t *zct = arg; 335da6c28aaSamw nvlist_t *nvprops = zct->zct_props; 336fa9e4066Sahrens int error; 337e9dbad6fSeschrock uint64_t volblocksize, volsize; 338fa9e4066Sahrens 339ecd6cf80Smarks VERIFY(nvlist_lookup_uint64(nvprops, 340e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 341ecd6cf80Smarks if (nvlist_lookup_uint64(nvprops, 342e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 343e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 344e9dbad6fSeschrock 345e9dbad6fSeschrock /* 346e7cbe64fSgw * These properties must be removed from the list so the generic 347e9dbad6fSeschrock * property setting step won't apply to them. 348e9dbad6fSeschrock */ 349ecd6cf80Smarks VERIFY(nvlist_remove_all(nvprops, 350e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 351ecd6cf80Smarks (void) nvlist_remove_all(nvprops, 352e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 353e9dbad6fSeschrock 354e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 355fa9e4066Sahrens DMU_OT_NONE, 0, tx); 356fa9e4066Sahrens ASSERT(error == 0); 357fa9e4066Sahrens 358fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 359fa9e4066Sahrens DMU_OT_NONE, 0, tx); 360fa9e4066Sahrens ASSERT(error == 0); 361fa9e4066Sahrens 362e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 363fa9e4066Sahrens ASSERT(error == 0); 364fa9e4066Sahrens } 365fa9e4066Sahrens 36622ac5be4Sperrin /* 36722ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 36822ac5be4Sperrin * after a system failure 36922ac5be4Sperrin */ 37022ac5be4Sperrin static int 37122ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 37222ac5be4Sperrin { 37322ac5be4Sperrin objset_t *os = zv->zv_objset; 37422ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 37522ac5be4Sperrin uint64_t off = lr->lr_offset; 37622ac5be4Sperrin uint64_t len = lr->lr_length; 37722ac5be4Sperrin dmu_tx_t *tx; 37822ac5be4Sperrin int error; 37922ac5be4Sperrin 38022ac5be4Sperrin if (byteswap) 38122ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 38222ac5be4Sperrin 38322ac5be4Sperrin tx = dmu_tx_create(os); 38422ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 3851209a471SNeil Perrin error = dmu_tx_assign(tx, TXG_WAIT); 38622ac5be4Sperrin if (error) { 38722ac5be4Sperrin dmu_tx_abort(tx); 38822ac5be4Sperrin } else { 38922ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 39022ac5be4Sperrin dmu_tx_commit(tx); 39122ac5be4Sperrin } 39222ac5be4Sperrin 39322ac5be4Sperrin return (error); 39422ac5be4Sperrin } 39522ac5be4Sperrin 39622ac5be4Sperrin /* ARGSUSED */ 39722ac5be4Sperrin static int 39822ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 39922ac5be4Sperrin { 40022ac5be4Sperrin return (ENOTSUP); 40122ac5be4Sperrin } 40222ac5be4Sperrin 40322ac5be4Sperrin /* 40422ac5be4Sperrin * Callback vectors for replaying records. 40522ac5be4Sperrin * Only TX_WRITE is needed for zvol. 40622ac5be4Sperrin */ 40722ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 40822ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 40922ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 41022ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 41122ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 41222ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 41322ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 41422ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 41522ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 41622ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 41722ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 41822ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 41922ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 42022ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 42122ac5be4Sperrin }; 42222ac5be4Sperrin 423e7cbe64fSgw /* 424e7cbe64fSgw * Create a minor node (plus a whole lot more) for the specified volume. 425fa9e4066Sahrens */ 426fa9e4066Sahrens int 42791ebeef5Sahrens zvol_create_minor(const char *name, major_t maj) 428fa9e4066Sahrens { 429fa9e4066Sahrens zvol_state_t *zv; 430fa9e4066Sahrens objset_t *os; 43167bd71c6Sperrin dmu_object_info_t doi; 432fa9e4066Sahrens uint64_t volsize; 433fa9e4066Sahrens minor_t minor = 0; 434fa9e4066Sahrens struct pathname linkpath; 435745cd3c5Smaybee int ds_mode = DS_MODE_OWNER; 436fa9e4066Sahrens vnode_t *vp = NULL; 437fa9e4066Sahrens char *devpath; 438e7cbe64fSgw size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1; 439fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 440fa9e4066Sahrens int error; 441fa9e4066Sahrens 442fa9e4066Sahrens mutex_enter(&zvol_state_lock); 443fa9e4066Sahrens 444fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 445fa9e4066Sahrens mutex_exit(&zvol_state_lock); 446fa9e4066Sahrens return (EEXIST); 447fa9e4066Sahrens } 448fa9e4066Sahrens 449fa9e4066Sahrens if (strchr(name, '@') != 0) 450fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 451fa9e4066Sahrens 452fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 453fa9e4066Sahrens 454fa9e4066Sahrens if (error) { 455fa9e4066Sahrens mutex_exit(&zvol_state_lock); 456fa9e4066Sahrens return (error); 457fa9e4066Sahrens } 458fa9e4066Sahrens 459fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 460fa9e4066Sahrens 461fa9e4066Sahrens if (error) { 462fa9e4066Sahrens dmu_objset_close(os); 463fa9e4066Sahrens mutex_exit(&zvol_state_lock); 464fa9e4066Sahrens return (error); 465fa9e4066Sahrens } 466fa9e4066Sahrens 467fa9e4066Sahrens /* 468fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 469fa9e4066Sahrens * same minor number we used last time. 470fa9e4066Sahrens */ 471fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 472fa9e4066Sahrens 473e7cbe64fSgw (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, name); 474fa9e4066Sahrens 475fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 476fa9e4066Sahrens 477fa9e4066Sahrens kmem_free(devpath, devpathlen); 478fa9e4066Sahrens 479fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 480fa9e4066Sahrens error = EINVAL; 481fa9e4066Sahrens 482fa9e4066Sahrens if (error == 0) { 483fa9e4066Sahrens pn_alloc(&linkpath); 484fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 485fa9e4066Sahrens if (error == 0) { 486fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 487fa9e4066Sahrens if (ms != NULL) { 488fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 489fa9e4066Sahrens minor = stoi(&ms); 490fa9e4066Sahrens } 491fa9e4066Sahrens } 492fa9e4066Sahrens pn_free(&linkpath); 493fa9e4066Sahrens } 494fa9e4066Sahrens 495fa9e4066Sahrens if (vp != NULL) 496fa9e4066Sahrens VN_RELE(vp); 497fa9e4066Sahrens 498fa9e4066Sahrens /* 499fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 500fa9e4066Sahrens */ 501fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 502fa9e4066Sahrens minor = 0; 503fa9e4066Sahrens 504fa9e4066Sahrens if (minor == 0) 505fa9e4066Sahrens minor = zvol_minor_alloc(); 506fa9e4066Sahrens 507fa9e4066Sahrens if (minor == 0) { 508fa9e4066Sahrens dmu_objset_close(os); 509fa9e4066Sahrens mutex_exit(&zvol_state_lock); 510fa9e4066Sahrens return (ENXIO); 511fa9e4066Sahrens } 512fa9e4066Sahrens 513fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 514fa9e4066Sahrens dmu_objset_close(os); 515fa9e4066Sahrens mutex_exit(&zvol_state_lock); 516fa9e4066Sahrens return (EAGAIN); 517fa9e4066Sahrens } 518fa9e4066Sahrens 519e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 520e9dbad6fSeschrock (char *)name); 521fa9e4066Sahrens 522fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 523fa9e4066Sahrens 524fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 525fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 526fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 527fa9e4066Sahrens dmu_objset_close(os); 528fa9e4066Sahrens mutex_exit(&zvol_state_lock); 529fa9e4066Sahrens return (EAGAIN); 530fa9e4066Sahrens } 531fa9e4066Sahrens 532fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 533fa9e4066Sahrens 534fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 535fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 536fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 537fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 538fa9e4066Sahrens dmu_objset_close(os); 539fa9e4066Sahrens mutex_exit(&zvol_state_lock); 540fa9e4066Sahrens return (EAGAIN); 541fa9e4066Sahrens } 542fa9e4066Sahrens 543fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 544fa9e4066Sahrens 545fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 546fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 547fa9e4066Sahrens zv->zv_minor = minor; 548fa9e4066Sahrens zv->zv_volsize = volsize; 549fa9e4066Sahrens zv->zv_objset = os; 550fa9e4066Sahrens zv->zv_mode = ds_mode; 55167bd71c6Sperrin zv->zv_zilog = zil_open(os, zvol_get_data); 552c2e6a7d6Sperrin mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 553c2e6a7d6Sperrin avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 554c2e6a7d6Sperrin sizeof (rl_t), offsetof(rl_t, r_node)); 55588b7b0f2SMatthew Ahrens list_create(&zv->zv_extents, sizeof (zvol_extent_t), 55688b7b0f2SMatthew Ahrens offsetof(zvol_extent_t, ze_node)); 55767bd71c6Sperrin /* get and cache the blocksize */ 55867bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 55967bd71c6Sperrin ASSERT(error == 0); 56067bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 56122ac5be4Sperrin 5621209a471SNeil Perrin zil_replay(os, zv, zvol_replay_vector); 56391ebeef5Sahrens zvol_size_changed(zv, maj); 564fa9e4066Sahrens 565ea8dc4b6Seschrock /* XXX this should handle the possible i/o error */ 566fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 567fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 568fa9e4066Sahrens 569fa9e4066Sahrens zvol_minors++; 570fa9e4066Sahrens 571fa9e4066Sahrens mutex_exit(&zvol_state_lock); 572fa9e4066Sahrens 573fa9e4066Sahrens return (0); 574fa9e4066Sahrens } 575fa9e4066Sahrens 576fa9e4066Sahrens /* 577fa9e4066Sahrens * Remove minor node for the specified volume. 578fa9e4066Sahrens */ 579fa9e4066Sahrens int 580e9dbad6fSeschrock zvol_remove_minor(const char *name) 581fa9e4066Sahrens { 582fa9e4066Sahrens zvol_state_t *zv; 583fa9e4066Sahrens char namebuf[30]; 584fa9e4066Sahrens 585fa9e4066Sahrens mutex_enter(&zvol_state_lock); 586fa9e4066Sahrens 587e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 588fa9e4066Sahrens mutex_exit(&zvol_state_lock); 589fa9e4066Sahrens return (ENXIO); 590fa9e4066Sahrens } 591fa9e4066Sahrens 592fa9e4066Sahrens if (zv->zv_total_opens != 0) { 593fa9e4066Sahrens mutex_exit(&zvol_state_lock); 594fa9e4066Sahrens return (EBUSY); 595fa9e4066Sahrens } 596fa9e4066Sahrens 597fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 598fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 599fa9e4066Sahrens 600fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 601fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 602fa9e4066Sahrens 603fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 604fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 605fa9e4066Sahrens 60622ac5be4Sperrin zil_close(zv->zv_zilog); 60722ac5be4Sperrin zv->zv_zilog = NULL; 608fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 609fa9e4066Sahrens zv->zv_objset = NULL; 610c2e6a7d6Sperrin avl_destroy(&zv->zv_znode.z_range_avl); 611c2e6a7d6Sperrin mutex_destroy(&zv->zv_znode.z_range_lock); 612fa9e4066Sahrens 613fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 614fa9e4066Sahrens 615fa9e4066Sahrens zvol_minors--; 616fa9e4066Sahrens 617fa9e4066Sahrens mutex_exit(&zvol_state_lock); 618fa9e4066Sahrens 619fa9e4066Sahrens return (0); 620fa9e4066Sahrens } 621fa9e4066Sahrens 622e7cbe64fSgw int 623e7cbe64fSgw zvol_prealloc(zvol_state_t *zv) 624e7cbe64fSgw { 625e7cbe64fSgw objset_t *os = zv->zv_objset; 626e7cbe64fSgw dmu_tx_t *tx; 627e7cbe64fSgw uint64_t refd, avail, usedobjs, availobjs; 628e7cbe64fSgw uint64_t resid = zv->zv_volsize; 629e7cbe64fSgw uint64_t off = 0; 630e7cbe64fSgw 631e7cbe64fSgw /* Check the space usage before attempting to allocate the space */ 632e7cbe64fSgw dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 633e7cbe64fSgw if (avail < zv->zv_volsize) 634e7cbe64fSgw return (ENOSPC); 635e7cbe64fSgw 636e7cbe64fSgw /* Free old extents if they exist */ 637e7cbe64fSgw zvol_free_extents(zv); 638e7cbe64fSgw 639e7cbe64fSgw while (resid != 0) { 640e7cbe64fSgw int error; 641e7cbe64fSgw uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); 642e7cbe64fSgw 643e7cbe64fSgw tx = dmu_tx_create(os); 644e7cbe64fSgw dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 645e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 646e7cbe64fSgw if (error) { 647e7cbe64fSgw dmu_tx_abort(tx); 648cdb0ab79Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 649e7cbe64fSgw return (error); 650e7cbe64fSgw } 65182c9918fSTim Haley dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 652e7cbe64fSgw dmu_tx_commit(tx); 653e7cbe64fSgw off += bytes; 654e7cbe64fSgw resid -= bytes; 655e7cbe64fSgw } 656e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 657e7cbe64fSgw 658e7cbe64fSgw return (0); 659e7cbe64fSgw } 660e7cbe64fSgw 661e7cbe64fSgw int 662e7cbe64fSgw zvol_update_volsize(zvol_state_t *zv, major_t maj, uint64_t volsize) 663e7cbe64fSgw { 664e7cbe64fSgw dmu_tx_t *tx; 665e7cbe64fSgw int error; 666e7cbe64fSgw 667e7cbe64fSgw ASSERT(MUTEX_HELD(&zvol_state_lock)); 668e7cbe64fSgw 669e7cbe64fSgw tx = dmu_tx_create(zv->zv_objset); 670e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 671e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 672e7cbe64fSgw if (error) { 673e7cbe64fSgw dmu_tx_abort(tx); 674e7cbe64fSgw return (error); 675e7cbe64fSgw } 676e7cbe64fSgw 677e7cbe64fSgw error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 678e7cbe64fSgw &volsize, tx); 679e7cbe64fSgw dmu_tx_commit(tx); 680e7cbe64fSgw 681e7cbe64fSgw if (error == 0) 682cdb0ab79Smaybee error = dmu_free_long_range(zv->zv_objset, 683cdb0ab79Smaybee ZVOL_OBJ, volsize, DMU_OBJECT_END); 684e7cbe64fSgw 685bb0ade09Sahrens /* 686bb0ade09Sahrens * If we are using a faked-up state (zv_minor == 0) then don't 687bb0ade09Sahrens * try to update the in-core zvol state. 688bb0ade09Sahrens */ 689bb0ade09Sahrens if (error == 0 && zv->zv_minor) { 690e7cbe64fSgw zv->zv_volsize = volsize; 691e7cbe64fSgw zvol_size_changed(zv, maj); 692e7cbe64fSgw } 693e7cbe64fSgw return (error); 694e7cbe64fSgw } 695e7cbe64fSgw 696fa9e4066Sahrens int 69791ebeef5Sahrens zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 698fa9e4066Sahrens { 699fa9e4066Sahrens zvol_state_t *zv; 700fa9e4066Sahrens int error; 7015c5460e9Seschrock dmu_object_info_t doi; 702e7cbe64fSgw uint64_t old_volsize = 0ULL; 703bb0ade09Sahrens zvol_state_t state = { 0 }; 704fa9e4066Sahrens 705fa9e4066Sahrens mutex_enter(&zvol_state_lock); 706fa9e4066Sahrens 707e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 708bb0ade09Sahrens /* 709bb0ade09Sahrens * If we are doing a "zfs clone -o volsize=", then the 710bb0ade09Sahrens * minor node won't exist yet. 711bb0ade09Sahrens */ 712bb0ade09Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, DS_MODE_OWNER, 713bb0ade09Sahrens &state.zv_objset); 714bb0ade09Sahrens if (error != 0) 715bb0ade09Sahrens goto out; 716bb0ade09Sahrens zv = &state; 717fa9e4066Sahrens } 718e7cbe64fSgw old_volsize = zv->zv_volsize; 719fa9e4066Sahrens 7205c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 721e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 722bb0ade09Sahrens doi.doi_data_block_size)) != 0) 723bb0ade09Sahrens goto out; 7245c5460e9Seschrock 725e7cbe64fSgw if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) { 726bb0ade09Sahrens error = EROFS; 727bb0ade09Sahrens goto out; 728fa9e4066Sahrens } 729fa9e4066Sahrens 730e7cbe64fSgw error = zvol_update_volsize(zv, maj, volsize); 731fa9e4066Sahrens 732e7cbe64fSgw /* 733e7cbe64fSgw * Reinitialize the dump area to the new size. If we 734e7cbe64fSgw * failed to resize the dump area then restore the it back to 735e7cbe64fSgw * it's original size. 736e7cbe64fSgw */ 737e7cbe64fSgw if (error == 0 && zv->zv_flags & ZVOL_DUMPIFIED) { 738e7cbe64fSgw if ((error = zvol_dumpify(zv)) != 0 || 739e7cbe64fSgw (error = dumpvp_resize()) != 0) { 740e7cbe64fSgw (void) zvol_update_volsize(zv, maj, old_volsize); 741e7cbe64fSgw error = zvol_dumpify(zv); 742e7cbe64fSgw } 743fa9e4066Sahrens } 744fa9e4066Sahrens 745bb0ade09Sahrens out: 746bb0ade09Sahrens if (state.zv_objset) 747bb0ade09Sahrens dmu_objset_close(state.zv_objset); 748bb0ade09Sahrens 749fa9e4066Sahrens mutex_exit(&zvol_state_lock); 750fa9e4066Sahrens 751fa9e4066Sahrens return (error); 752fa9e4066Sahrens } 753fa9e4066Sahrens 754fa9e4066Sahrens int 755e9dbad6fSeschrock zvol_set_volblocksize(const char *name, uint64_t volblocksize) 756fa9e4066Sahrens { 757fa9e4066Sahrens zvol_state_t *zv; 758fa9e4066Sahrens dmu_tx_t *tx; 759fa9e4066Sahrens int error; 76088b7b0f2SMatthew Ahrens boolean_t needlock; 761fa9e4066Sahrens 76288b7b0f2SMatthew Ahrens /* 76388b7b0f2SMatthew Ahrens * The lock may already be held if we are being called from 76488b7b0f2SMatthew Ahrens * zvol_dump_init(). 76588b7b0f2SMatthew Ahrens */ 76688b7b0f2SMatthew Ahrens needlock = !MUTEX_HELD(&zvol_state_lock); 76788b7b0f2SMatthew Ahrens if (needlock) 76888b7b0f2SMatthew Ahrens mutex_enter(&zvol_state_lock); 769fa9e4066Sahrens 770e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 77188b7b0f2SMatthew Ahrens if (needlock) 77288b7b0f2SMatthew Ahrens mutex_exit(&zvol_state_lock); 773fa9e4066Sahrens return (ENXIO); 774fa9e4066Sahrens } 775e7cbe64fSgw if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) { 77688b7b0f2SMatthew Ahrens if (needlock) 77788b7b0f2SMatthew Ahrens mutex_exit(&zvol_state_lock); 778fa9e4066Sahrens return (EROFS); 779fa9e4066Sahrens } 780fa9e4066Sahrens 781fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 782fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 783fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 784fa9e4066Sahrens if (error) { 785fa9e4066Sahrens dmu_tx_abort(tx); 786fa9e4066Sahrens } else { 787fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 788e9dbad6fSeschrock volblocksize, 0, tx); 789fa9e4066Sahrens if (error == ENOTSUP) 790fa9e4066Sahrens error = EBUSY; 791fa9e4066Sahrens dmu_tx_commit(tx); 79288b7b0f2SMatthew Ahrens if (error == 0) 79388b7b0f2SMatthew Ahrens zv->zv_volblocksize = volblocksize; 794fa9e4066Sahrens } 795fa9e4066Sahrens 79688b7b0f2SMatthew Ahrens if (needlock) 79788b7b0f2SMatthew Ahrens mutex_exit(&zvol_state_lock); 798fa9e4066Sahrens 799fa9e4066Sahrens return (error); 800fa9e4066Sahrens } 801fa9e4066Sahrens 802fa9e4066Sahrens /*ARGSUSED*/ 803fa9e4066Sahrens int 804fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 805fa9e4066Sahrens { 806fa9e4066Sahrens minor_t minor = getminor(*devp); 807fa9e4066Sahrens zvol_state_t *zv; 808fa9e4066Sahrens 809fa9e4066Sahrens if (minor == 0) /* This is the control device */ 810fa9e4066Sahrens return (0); 811fa9e4066Sahrens 812fa9e4066Sahrens mutex_enter(&zvol_state_lock); 813fa9e4066Sahrens 814fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 815fa9e4066Sahrens if (zv == NULL) { 816fa9e4066Sahrens mutex_exit(&zvol_state_lock); 817fa9e4066Sahrens return (ENXIO); 818fa9e4066Sahrens } 819fa9e4066Sahrens 820fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 821fa9e4066Sahrens 822fa9e4066Sahrens if ((flag & FWRITE) && 823e7cbe64fSgw (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))) { 824fa9e4066Sahrens mutex_exit(&zvol_state_lock); 825fa9e4066Sahrens return (EROFS); 826fa9e4066Sahrens } 827c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 828c7f714e2SEric Taylor mutex_exit(&zvol_state_lock); 829c7f714e2SEric Taylor return (EBUSY); 830c7f714e2SEric Taylor } 831c7f714e2SEric Taylor if (flag & FEXCL) { 832c7f714e2SEric Taylor if (zv->zv_total_opens != 0) { 833c7f714e2SEric Taylor mutex_exit(&zvol_state_lock); 834c7f714e2SEric Taylor return (EBUSY); 835c7f714e2SEric Taylor } 836c7f714e2SEric Taylor zv->zv_flags |= ZVOL_EXCL; 837c7f714e2SEric Taylor } 838fa9e4066Sahrens 839fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 840fa9e4066Sahrens zv->zv_open_count[otyp]++; 841fa9e4066Sahrens zv->zv_total_opens++; 842fa9e4066Sahrens } 843fa9e4066Sahrens 844fa9e4066Sahrens mutex_exit(&zvol_state_lock); 845fa9e4066Sahrens 846fa9e4066Sahrens return (0); 847fa9e4066Sahrens } 848fa9e4066Sahrens 849fa9e4066Sahrens /*ARGSUSED*/ 850fa9e4066Sahrens int 851fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 852fa9e4066Sahrens { 853fa9e4066Sahrens minor_t minor = getminor(dev); 854fa9e4066Sahrens zvol_state_t *zv; 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 885fa9e4066Sahrens mutex_exit(&zvol_state_lock); 886fa9e4066Sahrens 887fa9e4066Sahrens return (0); 888fa9e4066Sahrens } 889fa9e4066Sahrens 890feb08c6bSbillm static void 89167bd71c6Sperrin zvol_get_done(dmu_buf_t *db, void *vzgd) 89267bd71c6Sperrin { 89367bd71c6Sperrin zgd_t *zgd = (zgd_t *)vzgd; 894c2e6a7d6Sperrin rl_t *rl = zgd->zgd_rl; 89567bd71c6Sperrin 89667bd71c6Sperrin dmu_buf_rele(db, vzgd); 897c2e6a7d6Sperrin zfs_range_unlock(rl); 89817f17c2dSbonwick zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 89967bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 90067bd71c6Sperrin } 90167bd71c6Sperrin 90267bd71c6Sperrin /* 90367bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 90467bd71c6Sperrin */ 905feb08c6bSbillm static int 90667bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 90767bd71c6Sperrin { 90867bd71c6Sperrin zvol_state_t *zv = arg; 90967bd71c6Sperrin objset_t *os = zv->zv_objset; 91067bd71c6Sperrin dmu_buf_t *db; 911c2e6a7d6Sperrin rl_t *rl; 91267bd71c6Sperrin zgd_t *zgd; 913c2e6a7d6Sperrin uint64_t boff; /* block starting offset */ 914c2e6a7d6Sperrin int dlen = lr->lr_length; /* length of user data */ 91567bd71c6Sperrin int error; 91667bd71c6Sperrin 91767bd71c6Sperrin ASSERT(zio); 918c2e6a7d6Sperrin ASSERT(dlen != 0); 919feb08c6bSbillm 920c2e6a7d6Sperrin /* 921c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 922c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 923c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 924c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 925c2e6a7d6Sperrin * we don't have to write the data twice. 926c2e6a7d6Sperrin */ 927c2e6a7d6Sperrin if (buf != NULL) /* immediate write */ 928c2e6a7d6Sperrin return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf)); 92967bd71c6Sperrin 93067bd71c6Sperrin zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); 93167bd71c6Sperrin zgd->zgd_zilog = zv->zv_zilog; 93267bd71c6Sperrin zgd->zgd_bp = &lr->lr_blkptr; 93367bd71c6Sperrin 93467bd71c6Sperrin /* 935c2e6a7d6Sperrin * Lock the range of the block to ensure that when the data is 936e7cbe64fSgw * written out and its checksum is being calculated that no other 937c2e6a7d6Sperrin * thread can change the block. 93867bd71c6Sperrin */ 939c2e6a7d6Sperrin boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t); 940c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize, 941c2e6a7d6Sperrin RL_READER); 942c2e6a7d6Sperrin zgd->zgd_rl = rl; 943c2e6a7d6Sperrin 944c2e6a7d6Sperrin VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); 94567bd71c6Sperrin error = dmu_sync(zio, db, &lr->lr_blkptr, 94667bd71c6Sperrin lr->lr_common.lrc_txg, zvol_get_done, zgd); 947feb08c6bSbillm if (error == 0) 94817f17c2dSbonwick zil_add_block(zv->zv_zilog, &lr->lr_blkptr); 94967bd71c6Sperrin /* 95067bd71c6Sperrin * If we get EINPROGRESS, then we need to wait for a 95167bd71c6Sperrin * write IO initiated by dmu_sync() to complete before 95267bd71c6Sperrin * we can release this dbuf. We will finish everything 95367bd71c6Sperrin * up in the zvol_get_done() callback. 95467bd71c6Sperrin */ 95567bd71c6Sperrin if (error == EINPROGRESS) 95667bd71c6Sperrin return (0); 95767bd71c6Sperrin dmu_buf_rele(db, zgd); 958c2e6a7d6Sperrin zfs_range_unlock(rl); 95967bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 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 972feb08c6bSbillm zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len) 97322ac5be4Sperrin { 974feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 9751209a471SNeil Perrin zilog_t *zilog = zv->zv_zilog; 97622ac5be4Sperrin lr_write_t *lr; 97722ac5be4Sperrin 9781209a471SNeil Perrin if (zilog->zl_replay) { 9791209a471SNeil Perrin dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 9801209a471SNeil Perrin zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] = 9811209a471SNeil Perrin zilog->zl_replaying_seq; 9821209a471SNeil Perrin return; 9831209a471SNeil Perrin } 9841209a471SNeil Perrin 985a24e15ceSperrin while (len) { 986feb08c6bSbillm ssize_t nbytes = MIN(len, blocksize - P2PHASE(off, blocksize)); 987feb08c6bSbillm itx_t *itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 988feb08c6bSbillm 989feb08c6bSbillm itx->itx_wr_state = 990feb08c6bSbillm len > zvol_immediate_write_sz ? WR_INDIRECT : WR_NEED_COPY; 991feb08c6bSbillm itx->itx_private = zv; 992feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 993feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 994feb08c6bSbillm lr->lr_offset = off; 995feb08c6bSbillm lr->lr_length = nbytes; 996feb08c6bSbillm lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t); 997feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 998feb08c6bSbillm 9991209a471SNeil Perrin (void) zil_itx_assign(zilog, itx, tx); 1000a24e15ceSperrin len -= nbytes; 1001a24e15ceSperrin off += nbytes; 100222ac5be4Sperrin } 100322ac5be4Sperrin } 100422ac5be4Sperrin 100588b7b0f2SMatthew Ahrens static int 100688b7b0f2SMatthew Ahrens zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 100788b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1008e7cbe64fSgw { 1009e7cbe64fSgw vdev_disk_t *dvd; 1010e7cbe64fSgw int c; 1011e7cbe64fSgw int numerrors = 0; 1012e7cbe64fSgw 1013e7cbe64fSgw for (c = 0; c < vd->vdev_children; c++) { 101488b7b0f2SMatthew Ahrens ASSERT(vd->vdev_ops == &vdev_mirror_ops); 101588b7b0f2SMatthew Ahrens int err = zvol_dumpio_vdev(vd->vdev_child[c], 101688b7b0f2SMatthew Ahrens addr, offset, size, doread, isdump); 101788b7b0f2SMatthew Ahrens if (err != 0) { 1018e7cbe64fSgw numerrors++; 101988b7b0f2SMatthew Ahrens } else if (doread) { 1020e7cbe64fSgw break; 1021e7cbe64fSgw } 1022e7cbe64fSgw } 1023e7cbe64fSgw 1024e7cbe64fSgw if (!vd->vdev_ops->vdev_op_leaf) 1025e7cbe64fSgw return (numerrors < vd->vdev_children ? 0 : EIO); 1026e7cbe64fSgw 1027dc0bb255SEric Taylor if (doread && !vdev_readable(vd)) 1028dc0bb255SEric Taylor return (EIO); 1029dc0bb255SEric Taylor else if (!doread && !vdev_writeable(vd)) 1030e7cbe64fSgw return (EIO); 1031e7cbe64fSgw 1032e7cbe64fSgw dvd = vd->vdev_tsd; 1033e7cbe64fSgw ASSERT3P(dvd, !=, NULL); 1034e7cbe64fSgw offset += VDEV_LABEL_START_SIZE; 1035e7cbe64fSgw 1036e7cbe64fSgw if (ddi_in_panic() || isdump) { 103788b7b0f2SMatthew Ahrens ASSERT(!doread); 103888b7b0f2SMatthew Ahrens if (doread) 1039e7cbe64fSgw return (EIO); 1040e7cbe64fSgw return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1041e7cbe64fSgw lbtodb(size))); 1042e7cbe64fSgw } else { 1043e7cbe64fSgw return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 104488b7b0f2SMatthew Ahrens doread ? B_READ : B_WRITE)); 1045e7cbe64fSgw } 1046e7cbe64fSgw } 1047e7cbe64fSgw 104888b7b0f2SMatthew Ahrens static int 104988b7b0f2SMatthew Ahrens zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 105088b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1051e7cbe64fSgw { 1052e7cbe64fSgw vdev_t *vd; 1053e7cbe64fSgw int error; 105488b7b0f2SMatthew Ahrens zvol_extent_t *ze; 1055e7cbe64fSgw spa_t *spa = dmu_objset_spa(zv->zv_objset); 1056e7cbe64fSgw 105788b7b0f2SMatthew Ahrens /* Must be sector aligned, and not stradle a block boundary. */ 105888b7b0f2SMatthew Ahrens if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 105988b7b0f2SMatthew Ahrens P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1060e7cbe64fSgw return (EINVAL); 106188b7b0f2SMatthew Ahrens } 106288b7b0f2SMatthew Ahrens ASSERT(size <= zv->zv_volblocksize); 1063e7cbe64fSgw 106488b7b0f2SMatthew Ahrens /* Locate the extent this belongs to */ 106588b7b0f2SMatthew Ahrens ze = list_head(&zv->zv_extents); 106688b7b0f2SMatthew Ahrens while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 106788b7b0f2SMatthew Ahrens offset -= ze->ze_nblks * zv->zv_volblocksize; 106888b7b0f2SMatthew Ahrens ze = list_next(&zv->zv_extents, ze); 106988b7b0f2SMatthew Ahrens } 1070e14bb325SJeff Bonwick spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 107188b7b0f2SMatthew Ahrens vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 107288b7b0f2SMatthew Ahrens offset += DVA_GET_OFFSET(&ze->ze_dva); 107388b7b0f2SMatthew Ahrens error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 1074e14bb325SJeff Bonwick spa_config_exit(spa, SCL_STATE, FTAG); 1075e7cbe64fSgw return (error); 1076e7cbe64fSgw } 1077e7cbe64fSgw 1078fa9e4066Sahrens int 1079fa9e4066Sahrens zvol_strategy(buf_t *bp) 1080fa9e4066Sahrens { 1081fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 1082fa9e4066Sahrens uint64_t off, volsize; 108388b7b0f2SMatthew Ahrens size_t resid; 1084fa9e4066Sahrens char *addr; 108522ac5be4Sperrin objset_t *os; 1086c2e6a7d6Sperrin rl_t *rl; 1087fa9e4066Sahrens int error = 0; 108888b7b0f2SMatthew Ahrens boolean_t doread = bp->b_flags & B_READ; 108988b7b0f2SMatthew Ahrens boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 1090fa9e4066Sahrens 1091fa9e4066Sahrens if (zv == NULL) { 1092fa9e4066Sahrens bioerror(bp, ENXIO); 1093fa9e4066Sahrens biodone(bp); 1094fa9e4066Sahrens return (0); 1095fa9e4066Sahrens } 1096fa9e4066Sahrens 1097fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 1098fa9e4066Sahrens bioerror(bp, EINVAL); 1099fa9e4066Sahrens biodone(bp); 1100fa9e4066Sahrens return (0); 1101fa9e4066Sahrens } 1102fa9e4066Sahrens 1103e7cbe64fSgw if (!(bp->b_flags & B_READ) && 1104e7cbe64fSgw (zv->zv_flags & ZVOL_RDONLY || 1105e7cbe64fSgw zv->zv_mode & DS_MODE_READONLY)) { 1106fa9e4066Sahrens bioerror(bp, EROFS); 1107fa9e4066Sahrens biodone(bp); 1108fa9e4066Sahrens return (0); 1109fa9e4066Sahrens } 1110fa9e4066Sahrens 1111fa9e4066Sahrens off = ldbtob(bp->b_blkno); 1112fa9e4066Sahrens volsize = zv->zv_volsize; 1113fa9e4066Sahrens 111422ac5be4Sperrin os = zv->zv_objset; 111522ac5be4Sperrin ASSERT(os != NULL); 1116fa9e4066Sahrens 1117fa9e4066Sahrens bp_mapin(bp); 1118fa9e4066Sahrens addr = bp->b_un.b_addr; 1119fa9e4066Sahrens resid = bp->b_bcount; 1120fa9e4066Sahrens 112188b7b0f2SMatthew Ahrens if (resid > 0 && (off < 0 || off >= volsize)) { 112288b7b0f2SMatthew Ahrens bioerror(bp, EIO); 112388b7b0f2SMatthew Ahrens biodone(bp); 112488b7b0f2SMatthew Ahrens return (0); 112588b7b0f2SMatthew Ahrens } 112673ec3d9cSgw 1127a24e15ceSperrin /* 1128a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 1129a24e15ceSperrin * we can't change the data whilst calculating the checksum. 1130a24e15ceSperrin */ 1131c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 113288b7b0f2SMatthew Ahrens doread ? RL_READER : RL_WRITER); 1133fa9e4066Sahrens 1134e7cbe64fSgw while (resid != 0 && off < volsize) { 113588b7b0f2SMatthew Ahrens size_t size = MIN(resid, zvol_maxphys); 1136e7cbe64fSgw if (is_dump) { 1137e7cbe64fSgw size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 113888b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, off, size, 113988b7b0f2SMatthew Ahrens doread, B_FALSE); 114088b7b0f2SMatthew Ahrens } else if (doread) { 1141a24e15ceSperrin error = dmu_read(os, ZVOL_OBJ, off, size, addr); 1142fa9e4066Sahrens } else { 114322ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 1144fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1145fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 1146fa9e4066Sahrens if (error) { 1147fa9e4066Sahrens dmu_tx_abort(tx); 1148fa9e4066Sahrens } else { 114922ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1150feb08c6bSbillm zvol_log_write(zv, tx, off, size); 1151fa9e4066Sahrens dmu_tx_commit(tx); 1152fa9e4066Sahrens } 1153fa9e4066Sahrens } 1154b87f3af3Sperrin if (error) { 1155b87f3af3Sperrin /* convert checksum errors into IO errors */ 1156b87f3af3Sperrin if (error == ECKSUM) 1157b87f3af3Sperrin error = EIO; 1158fa9e4066Sahrens break; 1159b87f3af3Sperrin } 1160fa9e4066Sahrens off += size; 1161fa9e4066Sahrens addr += size; 1162fa9e4066Sahrens resid -= size; 1163fa9e4066Sahrens } 1164c2e6a7d6Sperrin zfs_range_unlock(rl); 1165fa9e4066Sahrens 1166fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 1167fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 1168fa9e4066Sahrens 1169*701f66c4SEric Taylor if (!(bp->b_flags & B_ASYNC) && !doread && !zil_disable && 1170*701f66c4SEric Taylor !is_dump && !(zv->zv_flags & ZVOL_WCE)) 1171feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1172feb08c6bSbillm biodone(bp); 117322ac5be4Sperrin 1174fa9e4066Sahrens return (0); 1175fa9e4066Sahrens } 1176fa9e4066Sahrens 117767bd71c6Sperrin /* 117867bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 117967bd71c6Sperrin * Using our own routine instead of the default minphys() 118067bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 118167bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 118267bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 118367bd71c6Sperrin * 56K on X86 and 128K on sparc). 118467bd71c6Sperrin */ 118567bd71c6Sperrin void 118667bd71c6Sperrin zvol_minphys(struct buf *bp) 118767bd71c6Sperrin { 118867bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 118967bd71c6Sperrin bp->b_bcount = zvol_maxphys; 119067bd71c6Sperrin } 119167bd71c6Sperrin 1192e7cbe64fSgw int 1193e7cbe64fSgw zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1194e7cbe64fSgw { 1195e7cbe64fSgw minor_t minor = getminor(dev); 1196e7cbe64fSgw zvol_state_t *zv; 1197e7cbe64fSgw int error = 0; 1198e7cbe64fSgw uint64_t size; 1199e7cbe64fSgw uint64_t boff; 1200e7cbe64fSgw uint64_t resid; 1201e7cbe64fSgw 1202e7cbe64fSgw if (minor == 0) /* This is the control device */ 1203e7cbe64fSgw return (ENXIO); 1204e7cbe64fSgw 1205e7cbe64fSgw zv = ddi_get_soft_state(zvol_state, minor); 1206e7cbe64fSgw if (zv == NULL) 1207e7cbe64fSgw return (ENXIO); 1208e7cbe64fSgw 1209e7cbe64fSgw boff = ldbtob(blkno); 1210e7cbe64fSgw resid = ldbtob(nblocks); 121188b7b0f2SMatthew Ahrens 121288b7b0f2SMatthew Ahrens VERIFY3U(boff + resid, <=, zv->zv_volsize); 121388b7b0f2SMatthew Ahrens 1214e7cbe64fSgw while (resid) { 1215e7cbe64fSgw size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 121688b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1217e7cbe64fSgw if (error) 1218e7cbe64fSgw break; 1219e7cbe64fSgw boff += size; 1220e7cbe64fSgw addr += size; 1221e7cbe64fSgw resid -= size; 1222e7cbe64fSgw } 1223e7cbe64fSgw 1224e7cbe64fSgw return (error); 1225e7cbe64fSgw } 1226e7cbe64fSgw 1227fa9e4066Sahrens /*ARGSUSED*/ 1228fa9e4066Sahrens int 1229feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1230fa9e4066Sahrens { 1231c7ca1008Sgw minor_t minor = getminor(dev); 1232c7ca1008Sgw zvol_state_t *zv; 123373ec3d9cSgw uint64_t volsize; 1234c2e6a7d6Sperrin rl_t *rl; 1235feb08c6bSbillm int error = 0; 1236fa9e4066Sahrens 1237c7ca1008Sgw if (minor == 0) /* This is the control device */ 1238c7ca1008Sgw return (ENXIO); 1239c7ca1008Sgw 1240c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1241c7ca1008Sgw if (zv == NULL) 1242c7ca1008Sgw return (ENXIO); 1243c7ca1008Sgw 124473ec3d9cSgw volsize = zv->zv_volsize; 124573ec3d9cSgw if (uio->uio_resid > 0 && 124673ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 124773ec3d9cSgw return (EIO); 124873ec3d9cSgw 124988b7b0f2SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 125088b7b0f2SMatthew Ahrens error = physio(zvol_strategy, NULL, dev, B_READ, 125188b7b0f2SMatthew Ahrens zvol_minphys, uio); 125288b7b0f2SMatthew Ahrens return (error); 125388b7b0f2SMatthew Ahrens } 125488b7b0f2SMatthew Ahrens 1255c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1256c2e6a7d6Sperrin RL_READER); 125773ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1258feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1259fa9e4066Sahrens 126073ec3d9cSgw /* don't read past the end */ 126173ec3d9cSgw if (bytes > volsize - uio->uio_loffset) 126273ec3d9cSgw bytes = volsize - uio->uio_loffset; 126373ec3d9cSgw 1264feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1265b87f3af3Sperrin if (error) { 1266b87f3af3Sperrin /* convert checksum errors into IO errors */ 1267b87f3af3Sperrin if (error == ECKSUM) 1268b87f3af3Sperrin error = EIO; 1269feb08c6bSbillm break; 1270b87f3af3Sperrin } 1271feb08c6bSbillm } 1272c2e6a7d6Sperrin zfs_range_unlock(rl); 1273feb08c6bSbillm return (error); 1274fa9e4066Sahrens } 1275fa9e4066Sahrens 1276fa9e4066Sahrens /*ARGSUSED*/ 1277fa9e4066Sahrens int 1278feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1279fa9e4066Sahrens { 1280c7ca1008Sgw minor_t minor = getminor(dev); 1281c7ca1008Sgw zvol_state_t *zv; 128273ec3d9cSgw uint64_t volsize; 1283c2e6a7d6Sperrin rl_t *rl; 1284feb08c6bSbillm int error = 0; 1285feb08c6bSbillm 1286c7ca1008Sgw if (minor == 0) /* This is the control device */ 1287c7ca1008Sgw return (ENXIO); 1288c7ca1008Sgw 1289c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1290c7ca1008Sgw if (zv == NULL) 1291c7ca1008Sgw return (ENXIO); 1292c7ca1008Sgw 129373ec3d9cSgw volsize = zv->zv_volsize; 129473ec3d9cSgw if (uio->uio_resid > 0 && 129573ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 129673ec3d9cSgw return (EIO); 129773ec3d9cSgw 1298e7cbe64fSgw if (zv->zv_flags & ZVOL_DUMPIFIED) { 1299e7cbe64fSgw error = physio(zvol_strategy, NULL, dev, B_WRITE, 1300e7cbe64fSgw zvol_minphys, uio); 1301e7cbe64fSgw return (error); 1302e7cbe64fSgw } 1303e7cbe64fSgw 1304c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1305c2e6a7d6Sperrin RL_WRITER); 130673ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1307feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1308feb08c6bSbillm uint64_t off = uio->uio_loffset; 1309feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 131073ec3d9cSgw 131173ec3d9cSgw if (bytes > volsize - off) /* don't write past the end */ 131273ec3d9cSgw bytes = volsize - off; 131373ec3d9cSgw 1314feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1315feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 1316feb08c6bSbillm if (error) { 1317feb08c6bSbillm dmu_tx_abort(tx); 1318feb08c6bSbillm break; 1319feb08c6bSbillm } 1320feb08c6bSbillm error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); 1321feb08c6bSbillm if (error == 0) 1322feb08c6bSbillm zvol_log_write(zv, tx, off, bytes); 1323feb08c6bSbillm dmu_tx_commit(tx); 1324feb08c6bSbillm 1325feb08c6bSbillm if (error) 1326feb08c6bSbillm break; 1327feb08c6bSbillm } 1328c2e6a7d6Sperrin zfs_range_unlock(rl); 1329*701f66c4SEric Taylor if (!zil_disable && !(zv->zv_flags & ZVOL_WCE)) 1330e08bf2c6SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1331feb08c6bSbillm return (error); 1332fa9e4066Sahrens } 1333fa9e4066Sahrens 1334c7f714e2SEric Taylor int 1335c7f714e2SEric Taylor zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1336c7f714e2SEric Taylor { 1337c7f714e2SEric Taylor struct uuid uuid = EFI_RESERVED; 1338c7f714e2SEric Taylor efi_gpe_t gpe = { 0 }; 1339c7f714e2SEric Taylor uint32_t crc; 1340c7f714e2SEric Taylor dk_efi_t efi; 1341c7f714e2SEric Taylor int length; 1342c7f714e2SEric Taylor char *ptr; 1343c7f714e2SEric Taylor 1344c7f714e2SEric Taylor if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1345c7f714e2SEric Taylor return (EFAULT); 1346c7f714e2SEric Taylor ptr = (char *)(uintptr_t)efi.dki_data_64; 1347c7f714e2SEric Taylor length = efi.dki_length; 1348c7f714e2SEric Taylor /* 1349c7f714e2SEric Taylor * Some clients may attempt to request a PMBR for the 1350c7f714e2SEric Taylor * zvol. Currently this interface will return EINVAL to 1351c7f714e2SEric Taylor * such requests. These requests could be supported by 1352c7f714e2SEric Taylor * adding a check for lba == 0 and consing up an appropriate 1353c7f714e2SEric Taylor * PMBR. 1354c7f714e2SEric Taylor */ 1355c7f714e2SEric Taylor if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1356c7f714e2SEric Taylor return (EINVAL); 1357c7f714e2SEric Taylor 1358c7f714e2SEric Taylor gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1359c7f714e2SEric Taylor gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1360c7f714e2SEric Taylor UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1361c7f714e2SEric Taylor 1362c7f714e2SEric Taylor if (efi.dki_lba == 1) { 1363c7f714e2SEric Taylor efi_gpt_t gpt = { 0 }; 1364c7f714e2SEric Taylor 1365c7f714e2SEric Taylor gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1366c7f714e2SEric Taylor gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1367c7f714e2SEric Taylor gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1368c7f714e2SEric Taylor gpt.efi_gpt_MyLBA = LE_64(1ULL); 1369c7f714e2SEric Taylor gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1370c7f714e2SEric Taylor gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1371c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1372c7f714e2SEric Taylor gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1373c7f714e2SEric Taylor gpt.efi_gpt_SizeOfPartitionEntry = 1374c7f714e2SEric Taylor LE_32(sizeof (efi_gpe_t)); 1375c7f714e2SEric Taylor CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1376c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1377c7f714e2SEric Taylor CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1378c7f714e2SEric Taylor gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1379c7f714e2SEric Taylor if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1380c7f714e2SEric Taylor flag)) 1381c7f714e2SEric Taylor return (EFAULT); 1382c7f714e2SEric Taylor ptr += sizeof (gpt); 1383c7f714e2SEric Taylor length -= sizeof (gpt); 1384c7f714e2SEric Taylor } 1385c7f714e2SEric Taylor if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1386c7f714e2SEric Taylor length), flag)) 1387c7f714e2SEric Taylor return (EFAULT); 1388c7f714e2SEric Taylor return (0); 1389c7f714e2SEric Taylor } 1390c7f714e2SEric Taylor 1391fa9e4066Sahrens /* 1392fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1393fa9e4066Sahrens */ 1394fa9e4066Sahrens /*ARGSUSED*/ 1395fa9e4066Sahrens int 1396fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1397fa9e4066Sahrens { 1398fa9e4066Sahrens zvol_state_t *zv; 1399af2c4821Smaybee struct dk_cinfo dki; 1400fa9e4066Sahrens struct dk_minfo dkm; 1401af2c4821Smaybee struct dk_callback *dkc; 1402fa9e4066Sahrens int error = 0; 1403e7cbe64fSgw rl_t *rl; 1404fa9e4066Sahrens 1405fa9e4066Sahrens mutex_enter(&zvol_state_lock); 1406fa9e4066Sahrens 1407fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 1408fa9e4066Sahrens 1409fa9e4066Sahrens if (zv == NULL) { 1410fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1411fa9e4066Sahrens return (ENXIO); 1412fa9e4066Sahrens } 1413*701f66c4SEric Taylor ASSERT(zv->zv_total_opens > 0); 1414fa9e4066Sahrens 1415fa9e4066Sahrens switch (cmd) { 1416fa9e4066Sahrens 1417fa9e4066Sahrens case DKIOCINFO: 1418af2c4821Smaybee bzero(&dki, sizeof (dki)); 1419af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1420af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1421af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 1422af2c4821Smaybee dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1423fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1424af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1425fa9e4066Sahrens error = EFAULT; 1426fa9e4066Sahrens return (error); 1427fa9e4066Sahrens 1428fa9e4066Sahrens case DKIOCGMEDIAINFO: 1429fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1430fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1431fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1432fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1433fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1434fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1435fa9e4066Sahrens error = EFAULT; 1436fa9e4066Sahrens return (error); 1437fa9e4066Sahrens 1438fa9e4066Sahrens case DKIOCGETEFI: 1439c7f714e2SEric Taylor { 1440c7f714e2SEric Taylor uint64_t vs = zv->zv_volsize; 1441c7f714e2SEric Taylor uint8_t bs = zv->zv_min_bs; 1442fa9e4066Sahrens 144368a5ac4dSmaybee mutex_exit(&zvol_state_lock); 1444c7f714e2SEric Taylor error = zvol_getefi((void *)arg, flag, vs, bs); 1445c7f714e2SEric Taylor return (error); 144668a5ac4dSmaybee } 1447fa9e4066Sahrens 1448feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1449af2c4821Smaybee dkc = (struct dk_callback *)arg; 1450*701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1451feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1452af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1453af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1454af2c4821Smaybee error = 0; 1455af2c4821Smaybee } 1456*701f66c4SEric Taylor return (error); 1457*701f66c4SEric Taylor 1458*701f66c4SEric Taylor case DKIOCGETWCE: 1459*701f66c4SEric Taylor { 1460*701f66c4SEric Taylor int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1461*701f66c4SEric Taylor if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1462*701f66c4SEric Taylor flag)) 1463*701f66c4SEric Taylor error = EFAULT; 1464*701f66c4SEric Taylor break; 1465*701f66c4SEric Taylor } 1466*701f66c4SEric Taylor case DKIOCSETWCE: 1467*701f66c4SEric Taylor { 1468*701f66c4SEric Taylor int wce; 1469*701f66c4SEric Taylor if (ddi_copyin((void *)arg, &wce, sizeof (int), 1470*701f66c4SEric Taylor flag)) { 1471*701f66c4SEric Taylor error = EFAULT; 1472*701f66c4SEric Taylor break; 1473*701f66c4SEric Taylor } 1474*701f66c4SEric Taylor if (wce) { 1475*701f66c4SEric Taylor zv->zv_flags |= ZVOL_WCE; 1476*701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1477*701f66c4SEric Taylor } else { 1478*701f66c4SEric Taylor zv->zv_flags &= ~ZVOL_WCE; 1479*701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1480*701f66c4SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1481*701f66c4SEric Taylor } 1482*701f66c4SEric Taylor return (0); 1483*701f66c4SEric Taylor } 1484feb08c6bSbillm 1485b6130eadSmaybee case DKIOCGGEOM: 1486b6130eadSmaybee case DKIOCGVTOC: 1487e7cbe64fSgw /* 1488e7cbe64fSgw * commands using these (like prtvtoc) expect ENOTSUP 1489e7cbe64fSgw * since we're emulating an EFI label 1490e7cbe64fSgw */ 1491b6130eadSmaybee error = ENOTSUP; 1492b6130eadSmaybee break; 1493b6130eadSmaybee 1494e7cbe64fSgw case DKIOCDUMPINIT: 1495e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1496e7cbe64fSgw RL_WRITER); 1497e7cbe64fSgw error = zvol_dumpify(zv); 1498e7cbe64fSgw zfs_range_unlock(rl); 1499e7cbe64fSgw break; 1500e7cbe64fSgw 1501e7cbe64fSgw case DKIOCDUMPFINI: 150206d5ae10SEric Taylor if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 150306d5ae10SEric Taylor break; 1504e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1505e7cbe64fSgw RL_WRITER); 1506e7cbe64fSgw error = zvol_dump_fini(zv); 1507e7cbe64fSgw zfs_range_unlock(rl); 1508e7cbe64fSgw break; 1509e7cbe64fSgw 1510fa9e4066Sahrens default: 151168a5ac4dSmaybee error = ENOTTY; 1512fa9e4066Sahrens break; 1513fa9e4066Sahrens 1514fa9e4066Sahrens } 1515fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1516fa9e4066Sahrens return (error); 1517fa9e4066Sahrens } 1518fa9e4066Sahrens 1519fa9e4066Sahrens int 1520fa9e4066Sahrens zvol_busy(void) 1521fa9e4066Sahrens { 1522fa9e4066Sahrens return (zvol_minors != 0); 1523fa9e4066Sahrens } 1524fa9e4066Sahrens 1525fa9e4066Sahrens void 1526fa9e4066Sahrens zvol_init(void) 1527fa9e4066Sahrens { 1528fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1529fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1530fa9e4066Sahrens } 1531fa9e4066Sahrens 1532fa9e4066Sahrens void 1533fa9e4066Sahrens zvol_fini(void) 1534fa9e4066Sahrens { 1535fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1536fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1537fa9e4066Sahrens } 1538e7cbe64fSgw 1539e7cbe64fSgw static boolean_t 1540e7cbe64fSgw zvol_is_swap(zvol_state_t *zv) 1541e7cbe64fSgw { 1542e7cbe64fSgw vnode_t *vp; 1543e7cbe64fSgw boolean_t ret = B_FALSE; 1544e7cbe64fSgw char *devpath; 1545e7cbe64fSgw size_t devpathlen; 1546e7cbe64fSgw int error; 1547e7cbe64fSgw 1548e7cbe64fSgw devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(zv->zv_name) + 1; 1549e7cbe64fSgw devpath = kmem_alloc(devpathlen, KM_SLEEP); 1550e7cbe64fSgw (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, zv->zv_name); 1551e7cbe64fSgw error = lookupname(devpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp); 1552e7cbe64fSgw kmem_free(devpath, devpathlen); 1553e7cbe64fSgw 1554e7cbe64fSgw ret = !error && IS_SWAPVP(common_specvp(vp)); 1555e7cbe64fSgw 1556e7cbe64fSgw if (vp != NULL) 1557e7cbe64fSgw VN_RELE(vp); 1558e7cbe64fSgw 1559e7cbe64fSgw return (ret); 1560e7cbe64fSgw } 1561e7cbe64fSgw 1562e7cbe64fSgw static int 1563e7cbe64fSgw zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1564e7cbe64fSgw { 1565e7cbe64fSgw dmu_tx_t *tx; 1566e7cbe64fSgw int error = 0; 1567e7cbe64fSgw objset_t *os = zv->zv_objset; 1568e7cbe64fSgw nvlist_t *nv = NULL; 1569e7cbe64fSgw 1570e7cbe64fSgw ASSERT(MUTEX_HELD(&zvol_state_lock)); 1571e7cbe64fSgw 1572e7cbe64fSgw tx = dmu_tx_create(os); 1573e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1574e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1575e7cbe64fSgw if (error) { 1576e7cbe64fSgw dmu_tx_abort(tx); 1577e7cbe64fSgw return (error); 1578e7cbe64fSgw } 1579e7cbe64fSgw 1580e7cbe64fSgw /* 1581e7cbe64fSgw * If we are resizing the dump device then we only need to 1582e7cbe64fSgw * update the refreservation to match the newly updated 1583e7cbe64fSgw * zvolsize. Otherwise, we save off the original state of the 1584e7cbe64fSgw * zvol so that we can restore them if the zvol is ever undumpified. 1585e7cbe64fSgw */ 1586e7cbe64fSgw if (resize) { 1587e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, 1588e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1589e7cbe64fSgw &zv->zv_volsize, tx); 1590e7cbe64fSgw } else { 159188b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 159288b7b0f2SMatthew Ahrens 1593e7cbe64fSgw error = dsl_prop_get_integer(zv->zv_name, 1594e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1595e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1596e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1597e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1598e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 159988b7b0f2SMatthew Ahrens error = error ? error : dsl_prop_get_integer(zv->zv_name, 160088b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 1601e7cbe64fSgw 1602e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1603e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1604e7cbe64fSgw &compress, tx); 1605e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1606e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1607e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1608e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1609e7cbe64fSgw &refresrv, tx); 161088b7b0f2SMatthew Ahrens error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 161188b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 161288b7b0f2SMatthew Ahrens &vbs, tx); 1613e7cbe64fSgw } 1614e7cbe64fSgw dmu_tx_commit(tx); 1615e7cbe64fSgw 1616e7cbe64fSgw /* Truncate the file */ 1617e7cbe64fSgw if (!error) 1618cdb0ab79Smaybee error = dmu_free_long_range(zv->zv_objset, 1619cdb0ab79Smaybee ZVOL_OBJ, 0, DMU_OBJECT_END); 1620e7cbe64fSgw 1621e7cbe64fSgw if (error) 1622e7cbe64fSgw return (error); 1623e7cbe64fSgw 1624e7cbe64fSgw /* 1625e7cbe64fSgw * We only need update the zvol's property if we are initializing 1626e7cbe64fSgw * the dump area for the first time. 1627e7cbe64fSgw */ 1628e7cbe64fSgw if (!resize) { 1629e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1630e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1631e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1632e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1633e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1634e7cbe64fSgw ZIO_COMPRESS_OFF) == 0); 1635e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1636e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1637e7cbe64fSgw ZIO_CHECKSUM_OFF) == 0); 163888b7b0f2SMatthew Ahrens VERIFY(nvlist_add_uint64(nv, 163988b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 164088b7b0f2SMatthew Ahrens SPA_MAXBLOCKSIZE) == 0); 1641e7cbe64fSgw 1642e7cbe64fSgw error = zfs_set_prop_nvlist(zv->zv_name, nv); 1643e7cbe64fSgw nvlist_free(nv); 1644e7cbe64fSgw 1645e7cbe64fSgw if (error) 1646e7cbe64fSgw return (error); 1647e7cbe64fSgw } 1648e7cbe64fSgw 1649e7cbe64fSgw /* Allocate the space for the dump */ 1650e7cbe64fSgw error = zvol_prealloc(zv); 1651e7cbe64fSgw return (error); 1652e7cbe64fSgw } 1653e7cbe64fSgw 1654e7cbe64fSgw static int 1655e7cbe64fSgw zvol_dumpify(zvol_state_t *zv) 1656e7cbe64fSgw { 1657e7cbe64fSgw int error = 0; 1658e7cbe64fSgw uint64_t dumpsize = 0; 1659e7cbe64fSgw dmu_tx_t *tx; 1660e7cbe64fSgw objset_t *os = zv->zv_objset; 1661e7cbe64fSgw 1662e7cbe64fSgw if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) 1663e7cbe64fSgw return (EROFS); 1664e7cbe64fSgw 1665e7cbe64fSgw /* 1666e7cbe64fSgw * We do not support swap devices acting as dump devices. 1667e7cbe64fSgw */ 1668e7cbe64fSgw if (zvol_is_swap(zv)) 1669e7cbe64fSgw return (ENOTSUP); 1670e7cbe64fSgw 1671e7cbe64fSgw if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1672e7cbe64fSgw 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 1673e7cbe64fSgw boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; 1674e7cbe64fSgw 1675e7cbe64fSgw if ((error = zvol_dump_init(zv, resize)) != 0) { 1676e7cbe64fSgw (void) zvol_dump_fini(zv); 1677e7cbe64fSgw return (error); 1678e7cbe64fSgw } 1679e7cbe64fSgw } 1680e7cbe64fSgw 1681e7cbe64fSgw /* 1682e7cbe64fSgw * Build up our lba mapping. 1683e7cbe64fSgw */ 1684e7cbe64fSgw error = zvol_get_lbas(zv); 1685e7cbe64fSgw if (error) { 1686e7cbe64fSgw (void) zvol_dump_fini(zv); 1687e7cbe64fSgw return (error); 1688e7cbe64fSgw } 1689e7cbe64fSgw 1690e7cbe64fSgw tx = dmu_tx_create(os); 1691e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1692e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1693e7cbe64fSgw if (error) { 1694e7cbe64fSgw dmu_tx_abort(tx); 1695e7cbe64fSgw (void) zvol_dump_fini(zv); 1696e7cbe64fSgw return (error); 1697e7cbe64fSgw } 1698e7cbe64fSgw 1699e7cbe64fSgw zv->zv_flags |= ZVOL_DUMPIFIED; 1700e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1701e7cbe64fSgw &zv->zv_volsize, tx); 1702e7cbe64fSgw dmu_tx_commit(tx); 1703e7cbe64fSgw 1704e7cbe64fSgw if (error) { 1705e7cbe64fSgw (void) zvol_dump_fini(zv); 1706e7cbe64fSgw return (error); 1707e7cbe64fSgw } 1708e7cbe64fSgw 1709e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 1710e7cbe64fSgw return (0); 1711e7cbe64fSgw } 1712e7cbe64fSgw 1713e7cbe64fSgw static int 1714e7cbe64fSgw zvol_dump_fini(zvol_state_t *zv) 1715e7cbe64fSgw { 1716e7cbe64fSgw dmu_tx_t *tx; 1717e7cbe64fSgw objset_t *os = zv->zv_objset; 1718e7cbe64fSgw nvlist_t *nv; 1719e7cbe64fSgw int error = 0; 172088b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 1721e7cbe64fSgw 1722b7e50089Smaybee /* 1723b7e50089Smaybee * Attempt to restore the zvol back to its pre-dumpified state. 1724b7e50089Smaybee * This is a best-effort attempt as it's possible that not all 1725b7e50089Smaybee * of these properties were initialized during the dumpify process 1726b7e50089Smaybee * (i.e. error during zvol_dump_init). 1727b7e50089Smaybee */ 1728b7e50089Smaybee 1729e7cbe64fSgw tx = dmu_tx_create(os); 1730e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1731e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1732e7cbe64fSgw if (error) { 1733e7cbe64fSgw dmu_tx_abort(tx); 1734e7cbe64fSgw return (error); 1735e7cbe64fSgw } 1736b7e50089Smaybee (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1737b7e50089Smaybee dmu_tx_commit(tx); 1738e7cbe64fSgw 1739e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1740e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1741e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1742e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1743e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1744e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 174588b7b0f2SMatthew Ahrens (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 174688b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1747e7cbe64fSgw 1748e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1749e7cbe64fSgw (void) nvlist_add_uint64(nv, 1750e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1751e7cbe64fSgw (void) nvlist_add_uint64(nv, 1752e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1753e7cbe64fSgw (void) nvlist_add_uint64(nv, 1754e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 175588b7b0f2SMatthew Ahrens (void) nvlist_add_uint64(nv, 175688b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), vbs); 1757e7cbe64fSgw (void) zfs_set_prop_nvlist(zv->zv_name, nv); 1758e7cbe64fSgw nvlist_free(nv); 1759e7cbe64fSgw 1760b7e50089Smaybee zvol_free_extents(zv); 1761b7e50089Smaybee zv->zv_flags &= ~ZVOL_DUMPIFIED; 1762b7e50089Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 1763b7e50089Smaybee 1764e7cbe64fSgw return (0); 1765e7cbe64fSgw } 1766