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 */ 110701f66c4SEric 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 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 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 745*573ca77eSGeorge Wilson /* 746*573ca77eSGeorge Wilson * Generate a LUN expansion event. 747*573ca77eSGeorge Wilson */ 748*573ca77eSGeorge Wilson if (error == 0) { 749*573ca77eSGeorge Wilson sysevent_id_t eid; 750*573ca77eSGeorge Wilson nvlist_t *attr; 751*573ca77eSGeorge Wilson char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 752*573ca77eSGeorge Wilson 753*573ca77eSGeorge Wilson (void) snprintf(physpath, MAXPATHLEN, "%s%uc", ZVOL_PSEUDO_DEV, 754*573ca77eSGeorge Wilson zv->zv_minor); 755*573ca77eSGeorge Wilson 756*573ca77eSGeorge Wilson VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 757*573ca77eSGeorge Wilson VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 758*573ca77eSGeorge Wilson 759*573ca77eSGeorge Wilson (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 760*573ca77eSGeorge Wilson ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 761*573ca77eSGeorge Wilson 762*573ca77eSGeorge Wilson nvlist_free(attr); 763*573ca77eSGeorge Wilson kmem_free(physpath, MAXPATHLEN); 764*573ca77eSGeorge Wilson } 765*573ca77eSGeorge Wilson 766bb0ade09Sahrens out: 767bb0ade09Sahrens if (state.zv_objset) 768bb0ade09Sahrens dmu_objset_close(state.zv_objset); 769bb0ade09Sahrens 770fa9e4066Sahrens mutex_exit(&zvol_state_lock); 771fa9e4066Sahrens 772fa9e4066Sahrens return (error); 773fa9e4066Sahrens } 774fa9e4066Sahrens 775fa9e4066Sahrens int 776e9dbad6fSeschrock zvol_set_volblocksize(const char *name, uint64_t volblocksize) 777fa9e4066Sahrens { 778fa9e4066Sahrens zvol_state_t *zv; 779fa9e4066Sahrens dmu_tx_t *tx; 780fa9e4066Sahrens int error; 78188b7b0f2SMatthew Ahrens boolean_t needlock; 782fa9e4066Sahrens 78388b7b0f2SMatthew Ahrens /* 78488b7b0f2SMatthew Ahrens * The lock may already be held if we are being called from 78588b7b0f2SMatthew Ahrens * zvol_dump_init(). 78688b7b0f2SMatthew Ahrens */ 78788b7b0f2SMatthew Ahrens needlock = !MUTEX_HELD(&zvol_state_lock); 78888b7b0f2SMatthew Ahrens if (needlock) 78988b7b0f2SMatthew Ahrens mutex_enter(&zvol_state_lock); 790fa9e4066Sahrens 791e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 79288b7b0f2SMatthew Ahrens if (needlock) 79388b7b0f2SMatthew Ahrens mutex_exit(&zvol_state_lock); 794fa9e4066Sahrens return (ENXIO); 795fa9e4066Sahrens } 796e7cbe64fSgw if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) { 79788b7b0f2SMatthew Ahrens if (needlock) 79888b7b0f2SMatthew Ahrens mutex_exit(&zvol_state_lock); 799fa9e4066Sahrens return (EROFS); 800fa9e4066Sahrens } 801fa9e4066Sahrens 802fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 803fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 804fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 805fa9e4066Sahrens if (error) { 806fa9e4066Sahrens dmu_tx_abort(tx); 807fa9e4066Sahrens } else { 808fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 809e9dbad6fSeschrock volblocksize, 0, tx); 810fa9e4066Sahrens if (error == ENOTSUP) 811fa9e4066Sahrens error = EBUSY; 812fa9e4066Sahrens dmu_tx_commit(tx); 81388b7b0f2SMatthew Ahrens if (error == 0) 81488b7b0f2SMatthew Ahrens zv->zv_volblocksize = volblocksize; 815fa9e4066Sahrens } 816fa9e4066Sahrens 81788b7b0f2SMatthew Ahrens if (needlock) 81888b7b0f2SMatthew Ahrens mutex_exit(&zvol_state_lock); 819fa9e4066Sahrens 820fa9e4066Sahrens return (error); 821fa9e4066Sahrens } 822fa9e4066Sahrens 823fa9e4066Sahrens /*ARGSUSED*/ 824fa9e4066Sahrens int 825fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 826fa9e4066Sahrens { 827fa9e4066Sahrens minor_t minor = getminor(*devp); 828fa9e4066Sahrens zvol_state_t *zv; 829fa9e4066Sahrens 830fa9e4066Sahrens if (minor == 0) /* This is the control device */ 831fa9e4066Sahrens return (0); 832fa9e4066Sahrens 833fa9e4066Sahrens mutex_enter(&zvol_state_lock); 834fa9e4066Sahrens 835fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 836fa9e4066Sahrens if (zv == NULL) { 837fa9e4066Sahrens mutex_exit(&zvol_state_lock); 838fa9e4066Sahrens return (ENXIO); 839fa9e4066Sahrens } 840fa9e4066Sahrens 841fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 842fa9e4066Sahrens 843fa9e4066Sahrens if ((flag & FWRITE) && 844e7cbe64fSgw (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))) { 845fa9e4066Sahrens mutex_exit(&zvol_state_lock); 846fa9e4066Sahrens return (EROFS); 847fa9e4066Sahrens } 848c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 849c7f714e2SEric Taylor mutex_exit(&zvol_state_lock); 850c7f714e2SEric Taylor return (EBUSY); 851c7f714e2SEric Taylor } 852c7f714e2SEric Taylor if (flag & FEXCL) { 853c7f714e2SEric Taylor if (zv->zv_total_opens != 0) { 854c7f714e2SEric Taylor mutex_exit(&zvol_state_lock); 855c7f714e2SEric Taylor return (EBUSY); 856c7f714e2SEric Taylor } 857c7f714e2SEric Taylor zv->zv_flags |= ZVOL_EXCL; 858c7f714e2SEric Taylor } 859fa9e4066Sahrens 860fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 861fa9e4066Sahrens zv->zv_open_count[otyp]++; 862fa9e4066Sahrens zv->zv_total_opens++; 863fa9e4066Sahrens } 864fa9e4066Sahrens 865fa9e4066Sahrens mutex_exit(&zvol_state_lock); 866fa9e4066Sahrens 867fa9e4066Sahrens return (0); 868fa9e4066Sahrens } 869fa9e4066Sahrens 870fa9e4066Sahrens /*ARGSUSED*/ 871fa9e4066Sahrens int 872fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 873fa9e4066Sahrens { 874fa9e4066Sahrens minor_t minor = getminor(dev); 875fa9e4066Sahrens zvol_state_t *zv; 876fa9e4066Sahrens 877fa9e4066Sahrens if (minor == 0) /* This is the control device */ 878fa9e4066Sahrens return (0); 879fa9e4066Sahrens 880fa9e4066Sahrens mutex_enter(&zvol_state_lock); 881fa9e4066Sahrens 882fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 883fa9e4066Sahrens if (zv == NULL) { 884fa9e4066Sahrens mutex_exit(&zvol_state_lock); 885fa9e4066Sahrens return (ENXIO); 886fa9e4066Sahrens } 887fa9e4066Sahrens 888c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 889c7f714e2SEric Taylor ASSERT(zv->zv_total_opens == 1); 890c7f714e2SEric Taylor zv->zv_flags &= ~ZVOL_EXCL; 891fa9e4066Sahrens } 892fa9e4066Sahrens 893fa9e4066Sahrens /* 894fa9e4066Sahrens * If the open count is zero, this is a spurious close. 895fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 896fa9e4066Sahrens */ 897fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 898fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 899fa9e4066Sahrens 900fa9e4066Sahrens /* 901fa9e4066Sahrens * You may get multiple opens, but only one close. 902fa9e4066Sahrens */ 903fa9e4066Sahrens zv->zv_open_count[otyp]--; 904fa9e4066Sahrens zv->zv_total_opens--; 905fa9e4066Sahrens 906fa9e4066Sahrens mutex_exit(&zvol_state_lock); 907fa9e4066Sahrens 908fa9e4066Sahrens return (0); 909fa9e4066Sahrens } 910fa9e4066Sahrens 911feb08c6bSbillm static void 91267bd71c6Sperrin zvol_get_done(dmu_buf_t *db, void *vzgd) 91367bd71c6Sperrin { 91467bd71c6Sperrin zgd_t *zgd = (zgd_t *)vzgd; 915c2e6a7d6Sperrin rl_t *rl = zgd->zgd_rl; 91667bd71c6Sperrin 91767bd71c6Sperrin dmu_buf_rele(db, vzgd); 918c2e6a7d6Sperrin zfs_range_unlock(rl); 91917f17c2dSbonwick zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 92067bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 92167bd71c6Sperrin } 92267bd71c6Sperrin 92367bd71c6Sperrin /* 92467bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 92567bd71c6Sperrin */ 926feb08c6bSbillm static int 92767bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 92867bd71c6Sperrin { 92967bd71c6Sperrin zvol_state_t *zv = arg; 93067bd71c6Sperrin objset_t *os = zv->zv_objset; 93167bd71c6Sperrin dmu_buf_t *db; 932c2e6a7d6Sperrin rl_t *rl; 93367bd71c6Sperrin zgd_t *zgd; 934c2e6a7d6Sperrin uint64_t boff; /* block starting offset */ 935c2e6a7d6Sperrin int dlen = lr->lr_length; /* length of user data */ 93667bd71c6Sperrin int error; 93767bd71c6Sperrin 93867bd71c6Sperrin ASSERT(zio); 939c2e6a7d6Sperrin ASSERT(dlen != 0); 940feb08c6bSbillm 941c2e6a7d6Sperrin /* 942c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 943c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 944c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 945c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 946c2e6a7d6Sperrin * we don't have to write the data twice. 947c2e6a7d6Sperrin */ 948c2e6a7d6Sperrin if (buf != NULL) /* immediate write */ 9497bfdf011SNeil Perrin return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf, 9507bfdf011SNeil Perrin DMU_READ_NO_PREFETCH)); 95167bd71c6Sperrin 95267bd71c6Sperrin zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); 95367bd71c6Sperrin zgd->zgd_zilog = zv->zv_zilog; 95467bd71c6Sperrin zgd->zgd_bp = &lr->lr_blkptr; 95567bd71c6Sperrin 95667bd71c6Sperrin /* 957c2e6a7d6Sperrin * Lock the range of the block to ensure that when the data is 958e7cbe64fSgw * written out and its checksum is being calculated that no other 959c2e6a7d6Sperrin * thread can change the block. 96067bd71c6Sperrin */ 961c2e6a7d6Sperrin boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t); 962c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize, 963c2e6a7d6Sperrin RL_READER); 964c2e6a7d6Sperrin zgd->zgd_rl = rl; 965c2e6a7d6Sperrin 966c2e6a7d6Sperrin VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); 96767bd71c6Sperrin error = dmu_sync(zio, db, &lr->lr_blkptr, 96867bd71c6Sperrin lr->lr_common.lrc_txg, zvol_get_done, zgd); 969feb08c6bSbillm if (error == 0) 97017f17c2dSbonwick zil_add_block(zv->zv_zilog, &lr->lr_blkptr); 97167bd71c6Sperrin /* 97267bd71c6Sperrin * If we get EINPROGRESS, then we need to wait for a 97367bd71c6Sperrin * write IO initiated by dmu_sync() to complete before 97467bd71c6Sperrin * we can release this dbuf. We will finish everything 97567bd71c6Sperrin * up in the zvol_get_done() callback. 97667bd71c6Sperrin */ 97767bd71c6Sperrin if (error == EINPROGRESS) 97867bd71c6Sperrin return (0); 97967bd71c6Sperrin dmu_buf_rele(db, zgd); 980c2e6a7d6Sperrin zfs_range_unlock(rl); 98167bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 98267bd71c6Sperrin return (error); 98367bd71c6Sperrin } 98467bd71c6Sperrin 985a24e15ceSperrin /* 986a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 98722ac5be4Sperrin * 98822ac5be4Sperrin * We store data in the log buffers if it's small enough. 98967bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 99022ac5be4Sperrin */ 99167bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 99222ac5be4Sperrin 993feb08c6bSbillm static void 994510b6c0eSNeil Perrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 995510b6c0eSNeil Perrin boolean_t sync) 99622ac5be4Sperrin { 997feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 9981209a471SNeil Perrin zilog_t *zilog = zv->zv_zilog; 999510b6c0eSNeil Perrin boolean_t slogging; 1000510b6c0eSNeil Perrin 1001510b6c0eSNeil Perrin if (zil_disable) 1002510b6c0eSNeil Perrin return; 100322ac5be4Sperrin 10041209a471SNeil Perrin if (zilog->zl_replay) { 10051209a471SNeil Perrin dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 10061209a471SNeil Perrin zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] = 10071209a471SNeil Perrin zilog->zl_replaying_seq; 10081209a471SNeil Perrin return; 10091209a471SNeil Perrin } 10101209a471SNeil Perrin 1011510b6c0eSNeil Perrin slogging = spa_has_slogs(zilog->zl_spa); 1012feb08c6bSbillm 1013510b6c0eSNeil Perrin while (resid) { 1014510b6c0eSNeil Perrin itx_t *itx; 1015510b6c0eSNeil Perrin lr_write_t *lr; 1016510b6c0eSNeil Perrin ssize_t len; 1017510b6c0eSNeil Perrin itx_wr_state_t write_state; 1018510b6c0eSNeil Perrin 1019510b6c0eSNeil Perrin /* 1020510b6c0eSNeil Perrin * Unlike zfs_log_write() we can be called with 1021510b6c0eSNeil Perrin * upto DMU_MAX_ACCESS/2 (5MB) writes. 1022510b6c0eSNeil Perrin */ 1023510b6c0eSNeil Perrin if (blocksize > zvol_immediate_write_sz && !slogging && 1024510b6c0eSNeil Perrin resid >= blocksize && off % blocksize == 0) { 1025510b6c0eSNeil Perrin write_state = WR_INDIRECT; /* uses dmu_sync */ 1026510b6c0eSNeil Perrin len = blocksize; 1027510b6c0eSNeil Perrin } else if (sync) { 1028510b6c0eSNeil Perrin write_state = WR_COPIED; 1029510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1030510b6c0eSNeil Perrin } else { 1031510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1032510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1033510b6c0eSNeil Perrin } 1034510b6c0eSNeil Perrin 1035510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1036510b6c0eSNeil Perrin (write_state == WR_COPIED ? len : 0)); 1037feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 1038510b6c0eSNeil Perrin if (write_state == WR_COPIED && dmu_read(zv->zv_objset, 10397bfdf011SNeil Perrin ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1040510b6c0eSNeil Perrin kmem_free(itx, offsetof(itx_t, itx_lr) + 1041510b6c0eSNeil Perrin itx->itx_lr.lrc_reclen); 1042510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1043510b6c0eSNeil Perrin lr = (lr_write_t *)&itx->itx_lr; 1044510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1045510b6c0eSNeil Perrin } 1046510b6c0eSNeil Perrin 1047510b6c0eSNeil Perrin itx->itx_wr_state = write_state; 1048510b6c0eSNeil Perrin if (write_state == WR_NEED_COPY) 1049510b6c0eSNeil Perrin itx->itx_sod += len; 1050feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 1051feb08c6bSbillm lr->lr_offset = off; 1052510b6c0eSNeil Perrin lr->lr_length = len; 1053feb08c6bSbillm lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t); 1054feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 1055feb08c6bSbillm 1056510b6c0eSNeil Perrin itx->itx_private = zv; 1057510b6c0eSNeil Perrin itx->itx_sync = sync; 1058510b6c0eSNeil Perrin 10591209a471SNeil Perrin (void) zil_itx_assign(zilog, itx, tx); 1060510b6c0eSNeil Perrin 1061510b6c0eSNeil Perrin off += len; 1062510b6c0eSNeil Perrin resid -= len; 106322ac5be4Sperrin } 106422ac5be4Sperrin } 106522ac5be4Sperrin 106688b7b0f2SMatthew Ahrens static int 106788b7b0f2SMatthew Ahrens zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 106888b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1069e7cbe64fSgw { 1070e7cbe64fSgw vdev_disk_t *dvd; 1071e7cbe64fSgw int c; 1072e7cbe64fSgw int numerrors = 0; 1073e7cbe64fSgw 1074e7cbe64fSgw for (c = 0; c < vd->vdev_children; c++) { 107521ecdf64SLin Ling ASSERT(vd->vdev_ops == &vdev_mirror_ops || 107621ecdf64SLin Ling vd->vdev_ops == &vdev_replacing_ops || 107721ecdf64SLin Ling vd->vdev_ops == &vdev_spare_ops); 107888b7b0f2SMatthew Ahrens int err = zvol_dumpio_vdev(vd->vdev_child[c], 107988b7b0f2SMatthew Ahrens addr, offset, size, doread, isdump); 108088b7b0f2SMatthew Ahrens if (err != 0) { 1081e7cbe64fSgw numerrors++; 108288b7b0f2SMatthew Ahrens } else if (doread) { 1083e7cbe64fSgw break; 1084e7cbe64fSgw } 1085e7cbe64fSgw } 1086e7cbe64fSgw 1087e7cbe64fSgw if (!vd->vdev_ops->vdev_op_leaf) 1088e7cbe64fSgw return (numerrors < vd->vdev_children ? 0 : EIO); 1089e7cbe64fSgw 1090dc0bb255SEric Taylor if (doread && !vdev_readable(vd)) 1091dc0bb255SEric Taylor return (EIO); 1092dc0bb255SEric Taylor else if (!doread && !vdev_writeable(vd)) 1093e7cbe64fSgw return (EIO); 1094e7cbe64fSgw 1095e7cbe64fSgw dvd = vd->vdev_tsd; 1096e7cbe64fSgw ASSERT3P(dvd, !=, NULL); 1097e7cbe64fSgw offset += VDEV_LABEL_START_SIZE; 1098e7cbe64fSgw 1099e7cbe64fSgw if (ddi_in_panic() || isdump) { 110088b7b0f2SMatthew Ahrens ASSERT(!doread); 110188b7b0f2SMatthew Ahrens if (doread) 1102e7cbe64fSgw return (EIO); 1103e7cbe64fSgw return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1104e7cbe64fSgw lbtodb(size))); 1105e7cbe64fSgw } else { 1106e7cbe64fSgw return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 110788b7b0f2SMatthew Ahrens doread ? B_READ : B_WRITE)); 1108e7cbe64fSgw } 1109e7cbe64fSgw } 1110e7cbe64fSgw 111188b7b0f2SMatthew Ahrens static int 111288b7b0f2SMatthew Ahrens zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 111388b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1114e7cbe64fSgw { 1115e7cbe64fSgw vdev_t *vd; 1116e7cbe64fSgw int error; 111788b7b0f2SMatthew Ahrens zvol_extent_t *ze; 1118e7cbe64fSgw spa_t *spa = dmu_objset_spa(zv->zv_objset); 1119e7cbe64fSgw 112088b7b0f2SMatthew Ahrens /* Must be sector aligned, and not stradle a block boundary. */ 112188b7b0f2SMatthew Ahrens if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 112288b7b0f2SMatthew Ahrens P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1123e7cbe64fSgw return (EINVAL); 112488b7b0f2SMatthew Ahrens } 112588b7b0f2SMatthew Ahrens ASSERT(size <= zv->zv_volblocksize); 1126e7cbe64fSgw 112788b7b0f2SMatthew Ahrens /* Locate the extent this belongs to */ 112888b7b0f2SMatthew Ahrens ze = list_head(&zv->zv_extents); 112988b7b0f2SMatthew Ahrens while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 113088b7b0f2SMatthew Ahrens offset -= ze->ze_nblks * zv->zv_volblocksize; 113188b7b0f2SMatthew Ahrens ze = list_next(&zv->zv_extents, ze); 113288b7b0f2SMatthew Ahrens } 1133e14bb325SJeff Bonwick spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 113488b7b0f2SMatthew Ahrens vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 113588b7b0f2SMatthew Ahrens offset += DVA_GET_OFFSET(&ze->ze_dva); 113688b7b0f2SMatthew Ahrens error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 1137e14bb325SJeff Bonwick spa_config_exit(spa, SCL_STATE, FTAG); 1138e7cbe64fSgw return (error); 1139e7cbe64fSgw } 1140e7cbe64fSgw 1141fa9e4066Sahrens int 1142fa9e4066Sahrens zvol_strategy(buf_t *bp) 1143fa9e4066Sahrens { 1144fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 1145fa9e4066Sahrens uint64_t off, volsize; 114688b7b0f2SMatthew Ahrens size_t resid; 1147fa9e4066Sahrens char *addr; 114822ac5be4Sperrin objset_t *os; 1149c2e6a7d6Sperrin rl_t *rl; 1150fa9e4066Sahrens int error = 0; 115188b7b0f2SMatthew Ahrens boolean_t doread = bp->b_flags & B_READ; 115288b7b0f2SMatthew Ahrens boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 1153510b6c0eSNeil Perrin boolean_t sync; 1154fa9e4066Sahrens 1155fa9e4066Sahrens if (zv == NULL) { 1156fa9e4066Sahrens bioerror(bp, ENXIO); 1157fa9e4066Sahrens biodone(bp); 1158fa9e4066Sahrens return (0); 1159fa9e4066Sahrens } 1160fa9e4066Sahrens 1161fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 1162fa9e4066Sahrens bioerror(bp, EINVAL); 1163fa9e4066Sahrens biodone(bp); 1164fa9e4066Sahrens return (0); 1165fa9e4066Sahrens } 1166fa9e4066Sahrens 1167e7cbe64fSgw if (!(bp->b_flags & B_READ) && 1168e7cbe64fSgw (zv->zv_flags & ZVOL_RDONLY || 1169e7cbe64fSgw zv->zv_mode & DS_MODE_READONLY)) { 1170fa9e4066Sahrens bioerror(bp, EROFS); 1171fa9e4066Sahrens biodone(bp); 1172fa9e4066Sahrens return (0); 1173fa9e4066Sahrens } 1174fa9e4066Sahrens 1175fa9e4066Sahrens off = ldbtob(bp->b_blkno); 1176fa9e4066Sahrens volsize = zv->zv_volsize; 1177fa9e4066Sahrens 117822ac5be4Sperrin os = zv->zv_objset; 117922ac5be4Sperrin ASSERT(os != NULL); 1180fa9e4066Sahrens 1181fa9e4066Sahrens bp_mapin(bp); 1182fa9e4066Sahrens addr = bp->b_un.b_addr; 1183fa9e4066Sahrens resid = bp->b_bcount; 1184fa9e4066Sahrens 118588b7b0f2SMatthew Ahrens if (resid > 0 && (off < 0 || off >= volsize)) { 118688b7b0f2SMatthew Ahrens bioerror(bp, EIO); 118788b7b0f2SMatthew Ahrens biodone(bp); 118888b7b0f2SMatthew Ahrens return (0); 118988b7b0f2SMatthew Ahrens } 119073ec3d9cSgw 1191510b6c0eSNeil Perrin sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump && 1192510b6c0eSNeil Perrin !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1193510b6c0eSNeil Perrin 1194a24e15ceSperrin /* 1195a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 1196a24e15ceSperrin * we can't change the data whilst calculating the checksum. 1197a24e15ceSperrin */ 1198c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 119988b7b0f2SMatthew Ahrens doread ? RL_READER : RL_WRITER); 1200fa9e4066Sahrens 1201e7cbe64fSgw while (resid != 0 && off < volsize) { 120288b7b0f2SMatthew Ahrens size_t size = MIN(resid, zvol_maxphys); 1203e7cbe64fSgw if (is_dump) { 1204e7cbe64fSgw size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 120588b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, off, size, 120688b7b0f2SMatthew Ahrens doread, B_FALSE); 120788b7b0f2SMatthew Ahrens } else if (doread) { 12087bfdf011SNeil Perrin error = dmu_read(os, ZVOL_OBJ, off, size, addr, 12097bfdf011SNeil Perrin DMU_READ_PREFETCH); 1210fa9e4066Sahrens } else { 121122ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 1212fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1213fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 1214fa9e4066Sahrens if (error) { 1215fa9e4066Sahrens dmu_tx_abort(tx); 1216fa9e4066Sahrens } else { 121722ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1218510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, size, sync); 1219fa9e4066Sahrens dmu_tx_commit(tx); 1220fa9e4066Sahrens } 1221fa9e4066Sahrens } 1222b87f3af3Sperrin if (error) { 1223b87f3af3Sperrin /* convert checksum errors into IO errors */ 1224b87f3af3Sperrin if (error == ECKSUM) 1225b87f3af3Sperrin error = EIO; 1226fa9e4066Sahrens break; 1227b87f3af3Sperrin } 1228fa9e4066Sahrens off += size; 1229fa9e4066Sahrens addr += size; 1230fa9e4066Sahrens resid -= size; 1231fa9e4066Sahrens } 1232c2e6a7d6Sperrin zfs_range_unlock(rl); 1233fa9e4066Sahrens 1234fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 1235fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 1236fa9e4066Sahrens 1237510b6c0eSNeil Perrin if (sync) 1238feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1239feb08c6bSbillm biodone(bp); 124022ac5be4Sperrin 1241fa9e4066Sahrens return (0); 1242fa9e4066Sahrens } 1243fa9e4066Sahrens 124467bd71c6Sperrin /* 124567bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 124667bd71c6Sperrin * Using our own routine instead of the default minphys() 124767bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 124867bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 124967bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 125067bd71c6Sperrin * 56K on X86 and 128K on sparc). 125167bd71c6Sperrin */ 125267bd71c6Sperrin void 125367bd71c6Sperrin zvol_minphys(struct buf *bp) 125467bd71c6Sperrin { 125567bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 125667bd71c6Sperrin bp->b_bcount = zvol_maxphys; 125767bd71c6Sperrin } 125867bd71c6Sperrin 1259e7cbe64fSgw int 1260e7cbe64fSgw zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1261e7cbe64fSgw { 1262e7cbe64fSgw minor_t minor = getminor(dev); 1263e7cbe64fSgw zvol_state_t *zv; 1264e7cbe64fSgw int error = 0; 1265e7cbe64fSgw uint64_t size; 1266e7cbe64fSgw uint64_t boff; 1267e7cbe64fSgw uint64_t resid; 1268e7cbe64fSgw 1269e7cbe64fSgw if (minor == 0) /* This is the control device */ 1270e7cbe64fSgw return (ENXIO); 1271e7cbe64fSgw 1272e7cbe64fSgw zv = ddi_get_soft_state(zvol_state, minor); 1273e7cbe64fSgw if (zv == NULL) 1274e7cbe64fSgw return (ENXIO); 1275e7cbe64fSgw 1276e7cbe64fSgw boff = ldbtob(blkno); 1277e7cbe64fSgw resid = ldbtob(nblocks); 127888b7b0f2SMatthew Ahrens 127988b7b0f2SMatthew Ahrens VERIFY3U(boff + resid, <=, zv->zv_volsize); 128088b7b0f2SMatthew Ahrens 1281e7cbe64fSgw while (resid) { 1282e7cbe64fSgw size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 128388b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1284e7cbe64fSgw if (error) 1285e7cbe64fSgw break; 1286e7cbe64fSgw boff += size; 1287e7cbe64fSgw addr += size; 1288e7cbe64fSgw resid -= size; 1289e7cbe64fSgw } 1290e7cbe64fSgw 1291e7cbe64fSgw return (error); 1292e7cbe64fSgw } 1293e7cbe64fSgw 1294fa9e4066Sahrens /*ARGSUSED*/ 1295fa9e4066Sahrens int 1296feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1297fa9e4066Sahrens { 1298c7ca1008Sgw minor_t minor = getminor(dev); 1299c7ca1008Sgw zvol_state_t *zv; 130073ec3d9cSgw uint64_t volsize; 1301c2e6a7d6Sperrin rl_t *rl; 1302feb08c6bSbillm int error = 0; 1303fa9e4066Sahrens 1304c7ca1008Sgw if (minor == 0) /* This is the control device */ 1305c7ca1008Sgw return (ENXIO); 1306c7ca1008Sgw 1307c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1308c7ca1008Sgw if (zv == NULL) 1309c7ca1008Sgw return (ENXIO); 1310c7ca1008Sgw 131173ec3d9cSgw volsize = zv->zv_volsize; 131273ec3d9cSgw if (uio->uio_resid > 0 && 131373ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 131473ec3d9cSgw return (EIO); 131573ec3d9cSgw 131688b7b0f2SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 131788b7b0f2SMatthew Ahrens error = physio(zvol_strategy, NULL, dev, B_READ, 131888b7b0f2SMatthew Ahrens zvol_minphys, uio); 131988b7b0f2SMatthew Ahrens return (error); 132088b7b0f2SMatthew Ahrens } 132188b7b0f2SMatthew Ahrens 1322c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1323c2e6a7d6Sperrin RL_READER); 132473ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1325feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1326fa9e4066Sahrens 132773ec3d9cSgw /* don't read past the end */ 132873ec3d9cSgw if (bytes > volsize - uio->uio_loffset) 132973ec3d9cSgw bytes = volsize - uio->uio_loffset; 133073ec3d9cSgw 1331feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1332b87f3af3Sperrin if (error) { 1333b87f3af3Sperrin /* convert checksum errors into IO errors */ 1334b87f3af3Sperrin if (error == ECKSUM) 1335b87f3af3Sperrin error = EIO; 1336feb08c6bSbillm break; 1337b87f3af3Sperrin } 1338feb08c6bSbillm } 1339c2e6a7d6Sperrin zfs_range_unlock(rl); 1340feb08c6bSbillm return (error); 1341fa9e4066Sahrens } 1342fa9e4066Sahrens 1343fa9e4066Sahrens /*ARGSUSED*/ 1344fa9e4066Sahrens int 1345feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1346fa9e4066Sahrens { 1347c7ca1008Sgw minor_t minor = getminor(dev); 1348c7ca1008Sgw zvol_state_t *zv; 134973ec3d9cSgw uint64_t volsize; 1350c2e6a7d6Sperrin rl_t *rl; 1351feb08c6bSbillm int error = 0; 1352510b6c0eSNeil Perrin boolean_t sync; 1353feb08c6bSbillm 1354c7ca1008Sgw if (minor == 0) /* This is the control device */ 1355c7ca1008Sgw return (ENXIO); 1356c7ca1008Sgw 1357c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1358c7ca1008Sgw if (zv == NULL) 1359c7ca1008Sgw return (ENXIO); 1360c7ca1008Sgw 136173ec3d9cSgw volsize = zv->zv_volsize; 136273ec3d9cSgw if (uio->uio_resid > 0 && 136373ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 136473ec3d9cSgw return (EIO); 136573ec3d9cSgw 1366e7cbe64fSgw if (zv->zv_flags & ZVOL_DUMPIFIED) { 1367e7cbe64fSgw error = physio(zvol_strategy, NULL, dev, B_WRITE, 1368e7cbe64fSgw zvol_minphys, uio); 1369e7cbe64fSgw return (error); 1370e7cbe64fSgw } 1371e7cbe64fSgw 1372510b6c0eSNeil Perrin sync = !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1373510b6c0eSNeil Perrin 1374c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1375c2e6a7d6Sperrin RL_WRITER); 137673ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1377feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1378feb08c6bSbillm uint64_t off = uio->uio_loffset; 1379feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 138073ec3d9cSgw 138173ec3d9cSgw if (bytes > volsize - off) /* don't write past the end */ 138273ec3d9cSgw bytes = volsize - off; 138373ec3d9cSgw 1384feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1385feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 1386feb08c6bSbillm if (error) { 1387feb08c6bSbillm dmu_tx_abort(tx); 1388feb08c6bSbillm break; 1389feb08c6bSbillm } 1390feb08c6bSbillm error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); 1391feb08c6bSbillm if (error == 0) 1392510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, bytes, sync); 1393feb08c6bSbillm dmu_tx_commit(tx); 1394feb08c6bSbillm 1395feb08c6bSbillm if (error) 1396feb08c6bSbillm break; 1397feb08c6bSbillm } 1398c2e6a7d6Sperrin zfs_range_unlock(rl); 1399510b6c0eSNeil Perrin if (sync) 1400e08bf2c6SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1401feb08c6bSbillm return (error); 1402fa9e4066Sahrens } 1403fa9e4066Sahrens 1404c7f714e2SEric Taylor int 1405c7f714e2SEric Taylor zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1406c7f714e2SEric Taylor { 1407c7f714e2SEric Taylor struct uuid uuid = EFI_RESERVED; 1408c7f714e2SEric Taylor efi_gpe_t gpe = { 0 }; 1409c7f714e2SEric Taylor uint32_t crc; 1410c7f714e2SEric Taylor dk_efi_t efi; 1411c7f714e2SEric Taylor int length; 1412c7f714e2SEric Taylor char *ptr; 1413c7f714e2SEric Taylor 1414c7f714e2SEric Taylor if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1415c7f714e2SEric Taylor return (EFAULT); 1416c7f714e2SEric Taylor ptr = (char *)(uintptr_t)efi.dki_data_64; 1417c7f714e2SEric Taylor length = efi.dki_length; 1418c7f714e2SEric Taylor /* 1419c7f714e2SEric Taylor * Some clients may attempt to request a PMBR for the 1420c7f714e2SEric Taylor * zvol. Currently this interface will return EINVAL to 1421c7f714e2SEric Taylor * such requests. These requests could be supported by 1422c7f714e2SEric Taylor * adding a check for lba == 0 and consing up an appropriate 1423c7f714e2SEric Taylor * PMBR. 1424c7f714e2SEric Taylor */ 1425c7f714e2SEric Taylor if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1426c7f714e2SEric Taylor return (EINVAL); 1427c7f714e2SEric Taylor 1428c7f714e2SEric Taylor gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1429c7f714e2SEric Taylor gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1430c7f714e2SEric Taylor UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1431c7f714e2SEric Taylor 1432c7f714e2SEric Taylor if (efi.dki_lba == 1) { 1433c7f714e2SEric Taylor efi_gpt_t gpt = { 0 }; 1434c7f714e2SEric Taylor 1435c7f714e2SEric Taylor gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1436c7f714e2SEric Taylor gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1437c7f714e2SEric Taylor gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1438c7f714e2SEric Taylor gpt.efi_gpt_MyLBA = LE_64(1ULL); 1439c7f714e2SEric Taylor gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1440c7f714e2SEric Taylor gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1441c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1442c7f714e2SEric Taylor gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1443c7f714e2SEric Taylor gpt.efi_gpt_SizeOfPartitionEntry = 1444c7f714e2SEric Taylor LE_32(sizeof (efi_gpe_t)); 1445c7f714e2SEric Taylor CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1446c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1447c7f714e2SEric Taylor CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1448c7f714e2SEric Taylor gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1449c7f714e2SEric Taylor if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1450c7f714e2SEric Taylor flag)) 1451c7f714e2SEric Taylor return (EFAULT); 1452c7f714e2SEric Taylor ptr += sizeof (gpt); 1453c7f714e2SEric Taylor length -= sizeof (gpt); 1454c7f714e2SEric Taylor } 1455c7f714e2SEric Taylor if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1456c7f714e2SEric Taylor length), flag)) 1457c7f714e2SEric Taylor return (EFAULT); 1458c7f714e2SEric Taylor return (0); 1459c7f714e2SEric Taylor } 1460c7f714e2SEric Taylor 1461fa9e4066Sahrens /* 1462fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1463fa9e4066Sahrens */ 1464fa9e4066Sahrens /*ARGSUSED*/ 1465fa9e4066Sahrens int 1466fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1467fa9e4066Sahrens { 1468fa9e4066Sahrens zvol_state_t *zv; 1469af2c4821Smaybee struct dk_cinfo dki; 1470fa9e4066Sahrens struct dk_minfo dkm; 1471af2c4821Smaybee struct dk_callback *dkc; 1472fa9e4066Sahrens int error = 0; 1473e7cbe64fSgw rl_t *rl; 1474fa9e4066Sahrens 1475fa9e4066Sahrens mutex_enter(&zvol_state_lock); 1476fa9e4066Sahrens 1477fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 1478fa9e4066Sahrens 1479fa9e4066Sahrens if (zv == NULL) { 1480fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1481fa9e4066Sahrens return (ENXIO); 1482fa9e4066Sahrens } 1483701f66c4SEric Taylor ASSERT(zv->zv_total_opens > 0); 1484fa9e4066Sahrens 1485fa9e4066Sahrens switch (cmd) { 1486fa9e4066Sahrens 1487fa9e4066Sahrens case DKIOCINFO: 1488af2c4821Smaybee bzero(&dki, sizeof (dki)); 1489af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1490af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1491af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 1492af2c4821Smaybee dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1493fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1494af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1495fa9e4066Sahrens error = EFAULT; 1496fa9e4066Sahrens return (error); 1497fa9e4066Sahrens 1498fa9e4066Sahrens case DKIOCGMEDIAINFO: 1499fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1500fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1501fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1502fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1503fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1504fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1505fa9e4066Sahrens error = EFAULT; 1506fa9e4066Sahrens return (error); 1507fa9e4066Sahrens 1508fa9e4066Sahrens case DKIOCGETEFI: 1509c7f714e2SEric Taylor { 1510c7f714e2SEric Taylor uint64_t vs = zv->zv_volsize; 1511c7f714e2SEric Taylor uint8_t bs = zv->zv_min_bs; 1512fa9e4066Sahrens 151368a5ac4dSmaybee mutex_exit(&zvol_state_lock); 1514c7f714e2SEric Taylor error = zvol_getefi((void *)arg, flag, vs, bs); 1515c7f714e2SEric Taylor return (error); 151668a5ac4dSmaybee } 1517fa9e4066Sahrens 1518feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1519af2c4821Smaybee dkc = (struct dk_callback *)arg; 1520701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1521feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1522af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1523af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1524af2c4821Smaybee error = 0; 1525af2c4821Smaybee } 1526701f66c4SEric Taylor return (error); 1527701f66c4SEric Taylor 1528701f66c4SEric Taylor case DKIOCGETWCE: 1529701f66c4SEric Taylor { 1530701f66c4SEric Taylor int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1531701f66c4SEric Taylor if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1532701f66c4SEric Taylor flag)) 1533701f66c4SEric Taylor error = EFAULT; 1534701f66c4SEric Taylor break; 1535701f66c4SEric Taylor } 1536701f66c4SEric Taylor case DKIOCSETWCE: 1537701f66c4SEric Taylor { 1538701f66c4SEric Taylor int wce; 1539701f66c4SEric Taylor if (ddi_copyin((void *)arg, &wce, sizeof (int), 1540701f66c4SEric Taylor flag)) { 1541701f66c4SEric Taylor error = EFAULT; 1542701f66c4SEric Taylor break; 1543701f66c4SEric Taylor } 1544701f66c4SEric Taylor if (wce) { 1545701f66c4SEric Taylor zv->zv_flags |= ZVOL_WCE; 1546701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1547701f66c4SEric Taylor } else { 1548701f66c4SEric Taylor zv->zv_flags &= ~ZVOL_WCE; 1549701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1550701f66c4SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1551701f66c4SEric Taylor } 1552701f66c4SEric Taylor return (0); 1553701f66c4SEric Taylor } 1554feb08c6bSbillm 1555b6130eadSmaybee case DKIOCGGEOM: 1556b6130eadSmaybee case DKIOCGVTOC: 1557e7cbe64fSgw /* 1558e7cbe64fSgw * commands using these (like prtvtoc) expect ENOTSUP 1559e7cbe64fSgw * since we're emulating an EFI label 1560e7cbe64fSgw */ 1561b6130eadSmaybee error = ENOTSUP; 1562b6130eadSmaybee break; 1563b6130eadSmaybee 1564e7cbe64fSgw case DKIOCDUMPINIT: 1565e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1566e7cbe64fSgw RL_WRITER); 1567e7cbe64fSgw error = zvol_dumpify(zv); 1568e7cbe64fSgw zfs_range_unlock(rl); 1569e7cbe64fSgw break; 1570e7cbe64fSgw 1571e7cbe64fSgw case DKIOCDUMPFINI: 157206d5ae10SEric Taylor if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 157306d5ae10SEric Taylor break; 1574e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1575e7cbe64fSgw RL_WRITER); 1576e7cbe64fSgw error = zvol_dump_fini(zv); 1577e7cbe64fSgw zfs_range_unlock(rl); 1578e7cbe64fSgw break; 1579e7cbe64fSgw 1580fa9e4066Sahrens default: 158168a5ac4dSmaybee error = ENOTTY; 1582fa9e4066Sahrens break; 1583fa9e4066Sahrens 1584fa9e4066Sahrens } 1585fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1586fa9e4066Sahrens return (error); 1587fa9e4066Sahrens } 1588fa9e4066Sahrens 1589fa9e4066Sahrens int 1590fa9e4066Sahrens zvol_busy(void) 1591fa9e4066Sahrens { 1592fa9e4066Sahrens return (zvol_minors != 0); 1593fa9e4066Sahrens } 1594fa9e4066Sahrens 1595fa9e4066Sahrens void 1596fa9e4066Sahrens zvol_init(void) 1597fa9e4066Sahrens { 1598fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1599fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1600fa9e4066Sahrens } 1601fa9e4066Sahrens 1602fa9e4066Sahrens void 1603fa9e4066Sahrens zvol_fini(void) 1604fa9e4066Sahrens { 1605fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1606fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1607fa9e4066Sahrens } 1608e7cbe64fSgw 1609e7cbe64fSgw static boolean_t 1610e7cbe64fSgw zvol_is_swap(zvol_state_t *zv) 1611e7cbe64fSgw { 1612e7cbe64fSgw vnode_t *vp; 1613e7cbe64fSgw boolean_t ret = B_FALSE; 1614e7cbe64fSgw char *devpath; 1615e7cbe64fSgw size_t devpathlen; 1616e7cbe64fSgw int error; 1617e7cbe64fSgw 1618e7cbe64fSgw devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(zv->zv_name) + 1; 1619e7cbe64fSgw devpath = kmem_alloc(devpathlen, KM_SLEEP); 1620e7cbe64fSgw (void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, zv->zv_name); 1621e7cbe64fSgw error = lookupname(devpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp); 1622e7cbe64fSgw kmem_free(devpath, devpathlen); 1623e7cbe64fSgw 1624e7cbe64fSgw ret = !error && IS_SWAPVP(common_specvp(vp)); 1625e7cbe64fSgw 1626e7cbe64fSgw if (vp != NULL) 1627e7cbe64fSgw VN_RELE(vp); 1628e7cbe64fSgw 1629e7cbe64fSgw return (ret); 1630e7cbe64fSgw } 1631e7cbe64fSgw 1632e7cbe64fSgw static int 1633e7cbe64fSgw zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1634e7cbe64fSgw { 1635e7cbe64fSgw dmu_tx_t *tx; 1636e7cbe64fSgw int error = 0; 1637e7cbe64fSgw objset_t *os = zv->zv_objset; 1638e7cbe64fSgw nvlist_t *nv = NULL; 1639e7cbe64fSgw 1640e7cbe64fSgw ASSERT(MUTEX_HELD(&zvol_state_lock)); 1641e7cbe64fSgw 1642e7cbe64fSgw tx = dmu_tx_create(os); 1643e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1644e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1645e7cbe64fSgw if (error) { 1646e7cbe64fSgw dmu_tx_abort(tx); 1647e7cbe64fSgw return (error); 1648e7cbe64fSgw } 1649e7cbe64fSgw 1650e7cbe64fSgw /* 1651e7cbe64fSgw * If we are resizing the dump device then we only need to 1652e7cbe64fSgw * update the refreservation to match the newly updated 1653e7cbe64fSgw * zvolsize. Otherwise, we save off the original state of the 1654e7cbe64fSgw * zvol so that we can restore them if the zvol is ever undumpified. 1655e7cbe64fSgw */ 1656e7cbe64fSgw if (resize) { 1657e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, 1658e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1659e7cbe64fSgw &zv->zv_volsize, tx); 1660e7cbe64fSgw } else { 166188b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 166288b7b0f2SMatthew Ahrens 1663e7cbe64fSgw error = dsl_prop_get_integer(zv->zv_name, 1664e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1665e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1666e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1667e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1668e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 166988b7b0f2SMatthew Ahrens error = error ? error : dsl_prop_get_integer(zv->zv_name, 167088b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 1671e7cbe64fSgw 1672e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1673e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1674e7cbe64fSgw &compress, tx); 1675e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1676e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1677e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1678e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1679e7cbe64fSgw &refresrv, tx); 168088b7b0f2SMatthew Ahrens error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 168188b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 168288b7b0f2SMatthew Ahrens &vbs, tx); 1683e7cbe64fSgw } 1684e7cbe64fSgw dmu_tx_commit(tx); 1685e7cbe64fSgw 1686e7cbe64fSgw /* Truncate the file */ 1687e7cbe64fSgw if (!error) 1688cdb0ab79Smaybee error = dmu_free_long_range(zv->zv_objset, 1689cdb0ab79Smaybee ZVOL_OBJ, 0, DMU_OBJECT_END); 1690e7cbe64fSgw 1691e7cbe64fSgw if (error) 1692e7cbe64fSgw return (error); 1693e7cbe64fSgw 1694e7cbe64fSgw /* 1695e7cbe64fSgw * We only need update the zvol's property if we are initializing 1696e7cbe64fSgw * the dump area for the first time. 1697e7cbe64fSgw */ 1698e7cbe64fSgw if (!resize) { 1699e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1700e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1701e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1702e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1703e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1704e7cbe64fSgw ZIO_COMPRESS_OFF) == 0); 1705e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1706e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1707e7cbe64fSgw ZIO_CHECKSUM_OFF) == 0); 170888b7b0f2SMatthew Ahrens VERIFY(nvlist_add_uint64(nv, 170988b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 171088b7b0f2SMatthew Ahrens SPA_MAXBLOCKSIZE) == 0); 1711e7cbe64fSgw 1712e7cbe64fSgw error = zfs_set_prop_nvlist(zv->zv_name, nv); 1713e7cbe64fSgw nvlist_free(nv); 1714e7cbe64fSgw 1715e7cbe64fSgw if (error) 1716e7cbe64fSgw return (error); 1717e7cbe64fSgw } 1718e7cbe64fSgw 1719e7cbe64fSgw /* Allocate the space for the dump */ 1720e7cbe64fSgw error = zvol_prealloc(zv); 1721e7cbe64fSgw return (error); 1722e7cbe64fSgw } 1723e7cbe64fSgw 1724e7cbe64fSgw static int 1725e7cbe64fSgw zvol_dumpify(zvol_state_t *zv) 1726e7cbe64fSgw { 1727e7cbe64fSgw int error = 0; 1728e7cbe64fSgw uint64_t dumpsize = 0; 1729e7cbe64fSgw dmu_tx_t *tx; 1730e7cbe64fSgw objset_t *os = zv->zv_objset; 1731e7cbe64fSgw 1732e7cbe64fSgw if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) 1733e7cbe64fSgw return (EROFS); 1734e7cbe64fSgw 1735e7cbe64fSgw /* 1736e7cbe64fSgw * We do not support swap devices acting as dump devices. 1737e7cbe64fSgw */ 1738e7cbe64fSgw if (zvol_is_swap(zv)) 1739e7cbe64fSgw return (ENOTSUP); 1740e7cbe64fSgw 1741e7cbe64fSgw if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1742e7cbe64fSgw 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 1743e7cbe64fSgw boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; 1744e7cbe64fSgw 1745e7cbe64fSgw if ((error = zvol_dump_init(zv, resize)) != 0) { 1746e7cbe64fSgw (void) zvol_dump_fini(zv); 1747e7cbe64fSgw return (error); 1748e7cbe64fSgw } 1749e7cbe64fSgw } 1750e7cbe64fSgw 1751e7cbe64fSgw /* 1752e7cbe64fSgw * Build up our lba mapping. 1753e7cbe64fSgw */ 1754e7cbe64fSgw error = zvol_get_lbas(zv); 1755e7cbe64fSgw if (error) { 1756e7cbe64fSgw (void) zvol_dump_fini(zv); 1757e7cbe64fSgw return (error); 1758e7cbe64fSgw } 1759e7cbe64fSgw 1760e7cbe64fSgw tx = dmu_tx_create(os); 1761e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1762e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1763e7cbe64fSgw if (error) { 1764e7cbe64fSgw dmu_tx_abort(tx); 1765e7cbe64fSgw (void) zvol_dump_fini(zv); 1766e7cbe64fSgw return (error); 1767e7cbe64fSgw } 1768e7cbe64fSgw 1769e7cbe64fSgw zv->zv_flags |= ZVOL_DUMPIFIED; 1770e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1771e7cbe64fSgw &zv->zv_volsize, tx); 1772e7cbe64fSgw dmu_tx_commit(tx); 1773e7cbe64fSgw 1774e7cbe64fSgw if (error) { 1775e7cbe64fSgw (void) zvol_dump_fini(zv); 1776e7cbe64fSgw return (error); 1777e7cbe64fSgw } 1778e7cbe64fSgw 1779e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 1780e7cbe64fSgw return (0); 1781e7cbe64fSgw } 1782e7cbe64fSgw 1783e7cbe64fSgw static int 1784e7cbe64fSgw zvol_dump_fini(zvol_state_t *zv) 1785e7cbe64fSgw { 1786e7cbe64fSgw dmu_tx_t *tx; 1787e7cbe64fSgw objset_t *os = zv->zv_objset; 1788e7cbe64fSgw nvlist_t *nv; 1789e7cbe64fSgw int error = 0; 179088b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 1791e7cbe64fSgw 1792b7e50089Smaybee /* 1793b7e50089Smaybee * Attempt to restore the zvol back to its pre-dumpified state. 1794b7e50089Smaybee * This is a best-effort attempt as it's possible that not all 1795b7e50089Smaybee * of these properties were initialized during the dumpify process 1796b7e50089Smaybee * (i.e. error during zvol_dump_init). 1797b7e50089Smaybee */ 1798b7e50089Smaybee 1799e7cbe64fSgw tx = dmu_tx_create(os); 1800e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1801e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1802e7cbe64fSgw if (error) { 1803e7cbe64fSgw dmu_tx_abort(tx); 1804e7cbe64fSgw return (error); 1805e7cbe64fSgw } 1806b7e50089Smaybee (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1807b7e50089Smaybee dmu_tx_commit(tx); 1808e7cbe64fSgw 1809e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1810e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1811e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1812e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1813e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1814e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 181588b7b0f2SMatthew Ahrens (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 181688b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1817e7cbe64fSgw 1818e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1819e7cbe64fSgw (void) nvlist_add_uint64(nv, 1820e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1821e7cbe64fSgw (void) nvlist_add_uint64(nv, 1822e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1823e7cbe64fSgw (void) nvlist_add_uint64(nv, 1824e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 182588b7b0f2SMatthew Ahrens (void) nvlist_add_uint64(nv, 182688b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), vbs); 1827e7cbe64fSgw (void) zfs_set_prop_nvlist(zv->zv_name, nv); 1828e7cbe64fSgw nvlist_free(nv); 1829e7cbe64fSgw 1830b7e50089Smaybee zvol_free_extents(zv); 1831b7e50089Smaybee zv->zv_flags &= ~ZVOL_DUMPIFIED; 1832b7e50089Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 1833b7e50089Smaybee 1834e7cbe64fSgw return (0); 1835e7cbe64fSgw } 1836