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 * 35*681d9761SEric Taylor * These links are created by the /dev filesystem (sdev_zvolops.c). 36fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 37fa9e4066Sahrens * run before opening and using a device. 38fa9e4066Sahrens */ 39fa9e4066Sahrens 40fa9e4066Sahrens #include <sys/types.h> 41fa9e4066Sahrens #include <sys/param.h> 42fa9e4066Sahrens #include <sys/errno.h> 43fa9e4066Sahrens #include <sys/uio.h> 44fa9e4066Sahrens #include <sys/buf.h> 45fa9e4066Sahrens #include <sys/modctl.h> 46fa9e4066Sahrens #include <sys/open.h> 47fa9e4066Sahrens #include <sys/kmem.h> 48fa9e4066Sahrens #include <sys/conf.h> 49fa9e4066Sahrens #include <sys/cmn_err.h> 50fa9e4066Sahrens #include <sys/stat.h> 51fa9e4066Sahrens #include <sys/zap.h> 52fa9e4066Sahrens #include <sys/spa.h> 53fa9e4066Sahrens #include <sys/zio.h> 54e7cbe64fSgw #include <sys/dmu_traverse.h> 55e7cbe64fSgw #include <sys/dnode.h> 56e7cbe64fSgw #include <sys/dsl_dataset.h> 57fa9e4066Sahrens #include <sys/dsl_prop.h> 58fa9e4066Sahrens #include <sys/dkio.h> 59fa9e4066Sahrens #include <sys/efi_partition.h> 60fa9e4066Sahrens #include <sys/byteorder.h> 61fa9e4066Sahrens #include <sys/pathname.h> 62fa9e4066Sahrens #include <sys/ddi.h> 63fa9e4066Sahrens #include <sys/sunddi.h> 64fa9e4066Sahrens #include <sys/crc32.h> 65fa9e4066Sahrens #include <sys/dirent.h> 66fa9e4066Sahrens #include <sys/policy.h> 67fa9e4066Sahrens #include <sys/fs/zfs.h> 68fa9e4066Sahrens #include <sys/zfs_ioctl.h> 69fa9e4066Sahrens #include <sys/mkdev.h> 7022ac5be4Sperrin #include <sys/zil.h> 71c5c6ffa0Smaybee #include <sys/refcount.h> 72c2e6a7d6Sperrin #include <sys/zfs_znode.h> 73c2e6a7d6Sperrin #include <sys/zfs_rlock.h> 74e7cbe64fSgw #include <sys/vdev_disk.h> 75e7cbe64fSgw #include <sys/vdev_impl.h> 76e7cbe64fSgw #include <sys/zvol.h> 77e7cbe64fSgw #include <sys/dumphdr.h> 781209a471SNeil Perrin #include <sys/zil_impl.h> 79fa9e4066Sahrens 80fa9e4066Sahrens #include "zfs_namecheck.h" 81fa9e4066Sahrens 82fa9e4066Sahrens static void *zvol_state; 83503ad85cSMatthew Ahrens static char *zvol_tag = "zvol_tag"; 84fa9e4066Sahrens 85e7cbe64fSgw #define ZVOL_DUMPSIZE "dumpsize" 86e7cbe64fSgw 87fa9e4066Sahrens /* 88fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 89fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 90fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 91fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 92fa9e4066Sahrens */ 93fa9e4066Sahrens static kmutex_t zvol_state_lock; 94fa9e4066Sahrens static uint32_t zvol_minors; 95fa9e4066Sahrens 96e7cbe64fSgw typedef struct zvol_extent { 9788b7b0f2SMatthew Ahrens list_node_t ze_node; 98e7cbe64fSgw dva_t ze_dva; /* dva associated with this extent */ 9988b7b0f2SMatthew Ahrens uint64_t ze_nblks; /* number of blocks in extent */ 100e7cbe64fSgw } zvol_extent_t; 101e7cbe64fSgw 102fa9e4066Sahrens /* 103fa9e4066Sahrens * The in-core state of each volume. 104fa9e4066Sahrens */ 105fa9e4066Sahrens typedef struct zvol_state { 106fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 107fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 10867bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 109fa9e4066Sahrens minor_t zv_minor; /* minor number */ 110fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 111701f66c4SEric Taylor uint8_t zv_flags; /* readonly, dumpified, etc. */ 112fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 113fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 114fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 11522ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 11688b7b0f2SMatthew Ahrens list_t zv_extents; /* List of extents for dump */ 117c2e6a7d6Sperrin znode_t zv_znode; /* for range locking */ 118fa9e4066Sahrens } zvol_state_t; 119fa9e4066Sahrens 120e7cbe64fSgw /* 121e7cbe64fSgw * zvol specific flags 122e7cbe64fSgw */ 123e7cbe64fSgw #define ZVOL_RDONLY 0x1 124e7cbe64fSgw #define ZVOL_DUMPIFIED 0x2 125c7f714e2SEric Taylor #define ZVOL_EXCL 0x4 126701f66c4SEric Taylor #define ZVOL_WCE 0x8 127e7cbe64fSgw 12867bd71c6Sperrin /* 12967bd71c6Sperrin * zvol maximum transfer in one DMU tx. 13067bd71c6Sperrin */ 13167bd71c6Sperrin int zvol_maxphys = DMU_MAX_ACCESS/2; 13267bd71c6Sperrin 133*681d9761SEric Taylor static int zvol_remove_zv(zvol_state_t *); 134e7cbe64fSgw extern int zfs_set_prop_nvlist(const char *, nvlist_t *); 135feb08c6bSbillm static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 136e7cbe64fSgw static int zvol_dumpify(zvol_state_t *zv); 137e7cbe64fSgw static int zvol_dump_fini(zvol_state_t *zv); 138e7cbe64fSgw static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 13967bd71c6Sperrin 140fa9e4066Sahrens static void 141*681d9761SEric Taylor zvol_size_changed(uint64_t volsize, major_t maj, minor_t min) 142fa9e4066Sahrens { 143*681d9761SEric Taylor dev_t dev = makedevice(maj, min); 144fa9e4066Sahrens 145fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 146*681d9761SEric Taylor "Size", volsize) == DDI_SUCCESS); 147fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 148*681d9761SEric Taylor "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 149e7cbe64fSgw 150e7cbe64fSgw /* Notify specfs to invalidate the cached size */ 151e7cbe64fSgw spec_size_invalidate(dev, VBLK); 152e7cbe64fSgw spec_size_invalidate(dev, VCHR); 153fa9e4066Sahrens } 154fa9e4066Sahrens 155fa9e4066Sahrens int 156e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 157fa9e4066Sahrens { 158e9dbad6fSeschrock if (volsize == 0) 159fa9e4066Sahrens return (EINVAL); 160fa9e4066Sahrens 161e9dbad6fSeschrock if (volsize % blocksize != 0) 1625c5460e9Seschrock return (EINVAL); 1635c5460e9Seschrock 164fa9e4066Sahrens #ifdef _ILP32 165e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 166fa9e4066Sahrens return (EOVERFLOW); 167fa9e4066Sahrens #endif 168fa9e4066Sahrens return (0); 169fa9e4066Sahrens } 170fa9e4066Sahrens 171fa9e4066Sahrens int 172e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 173fa9e4066Sahrens { 174e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 175e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 176e9dbad6fSeschrock !ISP2(volblocksize)) 177fa9e4066Sahrens return (EDOM); 178fa9e4066Sahrens 179fa9e4066Sahrens return (0); 180fa9e4066Sahrens } 181fa9e4066Sahrens 182fa9e4066Sahrens int 183a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 184fa9e4066Sahrens { 185fa9e4066Sahrens int error; 186fa9e4066Sahrens dmu_object_info_t doi; 187a2eea2e1Sahrens uint64_t val; 188fa9e4066Sahrens 189a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 190fa9e4066Sahrens if (error) 191fa9e4066Sahrens return (error); 192fa9e4066Sahrens 193a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 194a2eea2e1Sahrens 195fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 196fa9e4066Sahrens 197a2eea2e1Sahrens if (error == 0) { 198a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 199a2eea2e1Sahrens doi.doi_data_block_size); 200a2eea2e1Sahrens } 201fa9e4066Sahrens 202fa9e4066Sahrens return (error); 203fa9e4066Sahrens } 204fa9e4066Sahrens 205fa9e4066Sahrens /* 206fa9e4066Sahrens * Find a free minor number. 207fa9e4066Sahrens */ 208fa9e4066Sahrens static minor_t 209fa9e4066Sahrens zvol_minor_alloc(void) 210fa9e4066Sahrens { 211fa9e4066Sahrens minor_t minor; 212fa9e4066Sahrens 213fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 214fa9e4066Sahrens 215fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 216fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 217fa9e4066Sahrens return (minor); 218fa9e4066Sahrens 219fa9e4066Sahrens return (0); 220fa9e4066Sahrens } 221fa9e4066Sahrens 222fa9e4066Sahrens static zvol_state_t * 223e9dbad6fSeschrock zvol_minor_lookup(const char *name) 224fa9e4066Sahrens { 225fa9e4066Sahrens minor_t minor; 226fa9e4066Sahrens zvol_state_t *zv; 227fa9e4066Sahrens 228fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 229fa9e4066Sahrens 230fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 231fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 232fa9e4066Sahrens if (zv == NULL) 233fa9e4066Sahrens continue; 234fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 235fa9e4066Sahrens break; 236fa9e4066Sahrens } 237fa9e4066Sahrens 238fa9e4066Sahrens return (zv); 239fa9e4066Sahrens } 240fa9e4066Sahrens 241e7cbe64fSgw /* extent mapping arg */ 242e7cbe64fSgw struct maparg { 24388b7b0f2SMatthew Ahrens zvol_state_t *ma_zv; 24488b7b0f2SMatthew Ahrens uint64_t ma_blks; 245e7cbe64fSgw }; 246e7cbe64fSgw 247e7cbe64fSgw /*ARGSUSED*/ 248e7cbe64fSgw static int 24988b7b0f2SMatthew Ahrens zvol_map_block(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb, 25088b7b0f2SMatthew Ahrens const dnode_phys_t *dnp, void *arg) 251e7cbe64fSgw { 25288b7b0f2SMatthew Ahrens struct maparg *ma = arg; 25388b7b0f2SMatthew Ahrens zvol_extent_t *ze; 25488b7b0f2SMatthew Ahrens int bs = ma->ma_zv->zv_volblocksize; 255e7cbe64fSgw 25688b7b0f2SMatthew Ahrens if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 25788b7b0f2SMatthew Ahrens return (0); 258e7cbe64fSgw 25988b7b0f2SMatthew Ahrens VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 26088b7b0f2SMatthew Ahrens ma->ma_blks++; 261e7cbe64fSgw 26288b7b0f2SMatthew Ahrens /* Abort immediately if we have encountered gang blocks */ 26388b7b0f2SMatthew Ahrens if (BP_IS_GANG(bp)) 26488b7b0f2SMatthew Ahrens return (EFRAGS); 265e7cbe64fSgw 26688b7b0f2SMatthew Ahrens /* 26788b7b0f2SMatthew Ahrens * See if the block is at the end of the previous extent. 26888b7b0f2SMatthew Ahrens */ 26988b7b0f2SMatthew Ahrens ze = list_tail(&ma->ma_zv->zv_extents); 27088b7b0f2SMatthew Ahrens if (ze && 27188b7b0f2SMatthew Ahrens DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 27288b7b0f2SMatthew Ahrens DVA_GET_OFFSET(BP_IDENTITY(bp)) == 27388b7b0f2SMatthew Ahrens DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 27488b7b0f2SMatthew Ahrens ze->ze_nblks++; 27588b7b0f2SMatthew Ahrens return (0); 276e7cbe64fSgw } 277e7cbe64fSgw 27888b7b0f2SMatthew Ahrens dprintf_bp(bp, "%s", "next blkptr:"); 279e7cbe64fSgw 28088b7b0f2SMatthew Ahrens /* start a new extent */ 28188b7b0f2SMatthew Ahrens ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 28288b7b0f2SMatthew Ahrens ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 28388b7b0f2SMatthew Ahrens ze->ze_nblks = 1; 28488b7b0f2SMatthew Ahrens list_insert_tail(&ma->ma_zv->zv_extents, ze); 28588b7b0f2SMatthew Ahrens return (0); 28688b7b0f2SMatthew Ahrens } 287e7cbe64fSgw 28888b7b0f2SMatthew Ahrens static void 28988b7b0f2SMatthew Ahrens zvol_free_extents(zvol_state_t *zv) 29088b7b0f2SMatthew Ahrens { 29188b7b0f2SMatthew Ahrens zvol_extent_t *ze; 292e7cbe64fSgw 29388b7b0f2SMatthew Ahrens while (ze = list_head(&zv->zv_extents)) { 29488b7b0f2SMatthew Ahrens list_remove(&zv->zv_extents, ze); 29588b7b0f2SMatthew Ahrens kmem_free(ze, sizeof (zvol_extent_t)); 296e7cbe64fSgw } 29788b7b0f2SMatthew Ahrens } 298e7cbe64fSgw 29988b7b0f2SMatthew Ahrens static int 30088b7b0f2SMatthew Ahrens zvol_get_lbas(zvol_state_t *zv) 30188b7b0f2SMatthew Ahrens { 30288b7b0f2SMatthew Ahrens struct maparg ma; 30388b7b0f2SMatthew Ahrens int err; 30488b7b0f2SMatthew Ahrens 30588b7b0f2SMatthew Ahrens ma.ma_zv = zv; 30688b7b0f2SMatthew Ahrens ma.ma_blks = 0; 30788b7b0f2SMatthew Ahrens zvol_free_extents(zv); 30888b7b0f2SMatthew Ahrens 30988b7b0f2SMatthew Ahrens err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0, 31088b7b0f2SMatthew Ahrens TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 31188b7b0f2SMatthew Ahrens if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 31288b7b0f2SMatthew Ahrens zvol_free_extents(zv); 31388b7b0f2SMatthew Ahrens return (err ? err : EIO); 314e7cbe64fSgw } 31588b7b0f2SMatthew Ahrens 316e7cbe64fSgw return (0); 317e7cbe64fSgw } 318e7cbe64fSgw 319ecd6cf80Smarks /* ARGSUSED */ 320fa9e4066Sahrens void 321ecd6cf80Smarks zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 322fa9e4066Sahrens { 323da6c28aaSamw zfs_creat_t *zct = arg; 324da6c28aaSamw nvlist_t *nvprops = zct->zct_props; 325fa9e4066Sahrens int error; 326e9dbad6fSeschrock uint64_t volblocksize, volsize; 327fa9e4066Sahrens 328ecd6cf80Smarks VERIFY(nvlist_lookup_uint64(nvprops, 329e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 330ecd6cf80Smarks if (nvlist_lookup_uint64(nvprops, 331e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 332e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 333e9dbad6fSeschrock 334e9dbad6fSeschrock /* 335e7cbe64fSgw * These properties must be removed from the list so the generic 336e9dbad6fSeschrock * property setting step won't apply to them. 337e9dbad6fSeschrock */ 338ecd6cf80Smarks VERIFY(nvlist_remove_all(nvprops, 339e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 340ecd6cf80Smarks (void) nvlist_remove_all(nvprops, 341e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 342e9dbad6fSeschrock 343e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 344fa9e4066Sahrens DMU_OT_NONE, 0, tx); 345fa9e4066Sahrens ASSERT(error == 0); 346fa9e4066Sahrens 347fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 348fa9e4066Sahrens DMU_OT_NONE, 0, tx); 349fa9e4066Sahrens ASSERT(error == 0); 350fa9e4066Sahrens 351e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 352fa9e4066Sahrens ASSERT(error == 0); 353fa9e4066Sahrens } 354fa9e4066Sahrens 35522ac5be4Sperrin /* 35622ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 35722ac5be4Sperrin * after a system failure 35822ac5be4Sperrin */ 35922ac5be4Sperrin static int 36022ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 36122ac5be4Sperrin { 36222ac5be4Sperrin objset_t *os = zv->zv_objset; 36322ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 36422ac5be4Sperrin uint64_t off = lr->lr_offset; 36522ac5be4Sperrin uint64_t len = lr->lr_length; 36622ac5be4Sperrin dmu_tx_t *tx; 36722ac5be4Sperrin int error; 36822ac5be4Sperrin 36922ac5be4Sperrin if (byteswap) 37022ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 37122ac5be4Sperrin 37222ac5be4Sperrin tx = dmu_tx_create(os); 37322ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 3741209a471SNeil Perrin error = dmu_tx_assign(tx, TXG_WAIT); 37522ac5be4Sperrin if (error) { 37622ac5be4Sperrin dmu_tx_abort(tx); 37722ac5be4Sperrin } else { 37822ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 37922ac5be4Sperrin dmu_tx_commit(tx); 38022ac5be4Sperrin } 38122ac5be4Sperrin 38222ac5be4Sperrin return (error); 38322ac5be4Sperrin } 38422ac5be4Sperrin 38522ac5be4Sperrin /* ARGSUSED */ 38622ac5be4Sperrin static int 38722ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 38822ac5be4Sperrin { 38922ac5be4Sperrin return (ENOTSUP); 39022ac5be4Sperrin } 39122ac5be4Sperrin 39222ac5be4Sperrin /* 39322ac5be4Sperrin * Callback vectors for replaying records. 39422ac5be4Sperrin * Only TX_WRITE is needed for zvol. 39522ac5be4Sperrin */ 39622ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 39722ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 39822ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 39922ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 40022ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 40122ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 40222ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 40322ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 40422ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 40522ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 40622ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 40722ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 40822ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 40922ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 41022ac5be4Sperrin }; 41122ac5be4Sperrin 412*681d9761SEric Taylor int 413*681d9761SEric Taylor zvol_name2minor(const char *name, minor_t *minor) 414*681d9761SEric Taylor { 415*681d9761SEric Taylor zvol_state_t *zv; 416*681d9761SEric Taylor 417*681d9761SEric Taylor mutex_enter(&zvol_state_lock); 418*681d9761SEric Taylor zv = zvol_minor_lookup(name); 419*681d9761SEric Taylor if (minor && zv) 420*681d9761SEric Taylor *minor = zv->zv_minor; 421*681d9761SEric Taylor mutex_exit(&zvol_state_lock); 422*681d9761SEric Taylor return (zv ? 0 : -1); 423*681d9761SEric Taylor } 424*681d9761SEric Taylor 425e7cbe64fSgw /* 426e7cbe64fSgw * Create a minor node (plus a whole lot more) for the specified volume. 427fa9e4066Sahrens */ 428fa9e4066Sahrens int 429*681d9761SEric Taylor zvol_create_minor(const char *name) 430fa9e4066Sahrens { 431fa9e4066Sahrens zvol_state_t *zv; 432fa9e4066Sahrens objset_t *os; 43367bd71c6Sperrin dmu_object_info_t doi; 434fa9e4066Sahrens minor_t minor = 0; 435fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 436fa9e4066Sahrens int error; 437fa9e4066Sahrens 438fa9e4066Sahrens mutex_enter(&zvol_state_lock); 439fa9e4066Sahrens 440fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 441fa9e4066Sahrens mutex_exit(&zvol_state_lock); 442fa9e4066Sahrens return (EEXIST); 443fa9e4066Sahrens } 444fa9e4066Sahrens 445503ad85cSMatthew Ahrens /* lie and say we're read-only */ 446503ad85cSMatthew Ahrens error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, zvol_tag, &os); 447fa9e4066Sahrens 448fa9e4066Sahrens if (error) { 449fa9e4066Sahrens mutex_exit(&zvol_state_lock); 450fa9e4066Sahrens return (error); 451fa9e4066Sahrens } 452fa9e4066Sahrens 453*681d9761SEric Taylor if ((minor = zvol_minor_alloc()) == 0) { 454503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 455fa9e4066Sahrens mutex_exit(&zvol_state_lock); 456fa9e4066Sahrens return (ENXIO); 457fa9e4066Sahrens } 458fa9e4066Sahrens 459fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 460503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 461fa9e4066Sahrens mutex_exit(&zvol_state_lock); 462fa9e4066Sahrens return (EAGAIN); 463fa9e4066Sahrens } 464e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 465e9dbad6fSeschrock (char *)name); 466fa9e4066Sahrens 467*681d9761SEric Taylor (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 468fa9e4066Sahrens 469fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 470fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 471fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 472503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 473fa9e4066Sahrens mutex_exit(&zvol_state_lock); 474fa9e4066Sahrens return (EAGAIN); 475fa9e4066Sahrens } 476fa9e4066Sahrens 477*681d9761SEric Taylor (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 478fa9e4066Sahrens 479fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 480fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 481fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 482fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 483503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 484fa9e4066Sahrens mutex_exit(&zvol_state_lock); 485fa9e4066Sahrens return (EAGAIN); 486fa9e4066Sahrens } 487fa9e4066Sahrens 488fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 489fa9e4066Sahrens 490*681d9761SEric Taylor (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 491fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 492fa9e4066Sahrens zv->zv_minor = minor; 493fa9e4066Sahrens zv->zv_objset = os; 494*681d9761SEric Taylor if (dmu_objset_is_snapshot(os)) 495*681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 496c2e6a7d6Sperrin mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 497c2e6a7d6Sperrin avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 498c2e6a7d6Sperrin sizeof (rl_t), offsetof(rl_t, r_node)); 49988b7b0f2SMatthew Ahrens list_create(&zv->zv_extents, sizeof (zvol_extent_t), 50088b7b0f2SMatthew Ahrens offsetof(zvol_extent_t, ze_node)); 50167bd71c6Sperrin /* get and cache the blocksize */ 50267bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 50367bd71c6Sperrin ASSERT(error == 0); 50467bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 50522ac5be4Sperrin 5061209a471SNeil Perrin zil_replay(os, zv, zvol_replay_vector); 507*681d9761SEric Taylor dmu_objset_disown(os, zvol_tag); 508*681d9761SEric Taylor zv->zv_objset = NULL; 509fa9e4066Sahrens 510fa9e4066Sahrens zvol_minors++; 511fa9e4066Sahrens 512fa9e4066Sahrens mutex_exit(&zvol_state_lock); 513fa9e4066Sahrens 514fa9e4066Sahrens return (0); 515fa9e4066Sahrens } 516fa9e4066Sahrens 517fa9e4066Sahrens /* 518fa9e4066Sahrens * Remove minor node for the specified volume. 519fa9e4066Sahrens */ 520*681d9761SEric Taylor static int 521*681d9761SEric Taylor zvol_remove_zv(zvol_state_t *zv) 522*681d9761SEric Taylor { 523*681d9761SEric Taylor char nmbuf[20]; 524*681d9761SEric Taylor 525*681d9761SEric Taylor ASSERT(MUTEX_HELD(&zvol_state_lock)); 526*681d9761SEric Taylor if (zv->zv_total_opens != 0) 527*681d9761SEric Taylor return (EBUSY); 528*681d9761SEric Taylor 529*681d9761SEric Taylor (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", zv->zv_minor); 530*681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 531*681d9761SEric Taylor 532*681d9761SEric Taylor (void) snprintf(nmbuf, sizeof (nmbuf), "%u", zv->zv_minor); 533*681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 534*681d9761SEric Taylor 535*681d9761SEric Taylor avl_destroy(&zv->zv_znode.z_range_avl); 536*681d9761SEric Taylor mutex_destroy(&zv->zv_znode.z_range_lock); 537*681d9761SEric Taylor 538*681d9761SEric Taylor ddi_soft_state_free(zvol_state, zv->zv_minor); 539*681d9761SEric Taylor 540*681d9761SEric Taylor zvol_minors--; 541*681d9761SEric Taylor return (0); 542*681d9761SEric Taylor } 543*681d9761SEric Taylor 544fa9e4066Sahrens int 545e9dbad6fSeschrock zvol_remove_minor(const char *name) 546fa9e4066Sahrens { 547fa9e4066Sahrens zvol_state_t *zv; 548*681d9761SEric Taylor int rc; 549fa9e4066Sahrens 550fa9e4066Sahrens mutex_enter(&zvol_state_lock); 551e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 552fa9e4066Sahrens mutex_exit(&zvol_state_lock); 553fa9e4066Sahrens return (ENXIO); 554fa9e4066Sahrens } 555*681d9761SEric Taylor rc = zvol_remove_zv(zv); 556*681d9761SEric Taylor mutex_exit(&zvol_state_lock); 557*681d9761SEric Taylor return (rc); 558*681d9761SEric Taylor } 559fa9e4066Sahrens 560*681d9761SEric Taylor int 561*681d9761SEric Taylor zvol_first_open(zvol_state_t *zv) 562*681d9761SEric Taylor { 563*681d9761SEric Taylor objset_t *os; 564*681d9761SEric Taylor uint64_t volsize; 565*681d9761SEric Taylor int error; 566*681d9761SEric Taylor uint64_t readonly; 567fa9e4066Sahrens 568*681d9761SEric Taylor /* lie and say we're read-only */ 569*681d9761SEric Taylor error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 570*681d9761SEric Taylor zvol_tag, &os); 571*681d9761SEric Taylor if (error) 572*681d9761SEric Taylor return (error); 573fa9e4066Sahrens 574*681d9761SEric Taylor error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 575*681d9761SEric Taylor if (error) { 576*681d9761SEric Taylor ASSERT(error == 0); 577*681d9761SEric Taylor dmu_objset_disown(os, zvol_tag); 578*681d9761SEric Taylor return (error); 579*681d9761SEric Taylor } 580*681d9761SEric Taylor zv->zv_objset = os; 581*681d9761SEric Taylor zv->zv_volsize = volsize; 582*681d9761SEric Taylor zv->zv_zilog = zil_open(os, zvol_get_data); 583*681d9761SEric Taylor zvol_size_changed(zv->zv_volsize, ddi_driver_major(zfs_dip), 584*681d9761SEric Taylor zv->zv_minor); 585fa9e4066Sahrens 586*681d9761SEric Taylor VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 587*681d9761SEric Taylor NULL) == 0); 588*681d9761SEric Taylor if (readonly || dmu_objset_is_snapshot(os)) 589*681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 590*681d9761SEric Taylor else 591*681d9761SEric Taylor zv->zv_flags &= ~ZVOL_RDONLY; 592*681d9761SEric Taylor return (error); 593*681d9761SEric Taylor } 594fa9e4066Sahrens 595*681d9761SEric Taylor void 596*681d9761SEric Taylor zvol_last_close(zvol_state_t *zv) 597*681d9761SEric Taylor { 59822ac5be4Sperrin zil_close(zv->zv_zilog); 59922ac5be4Sperrin zv->zv_zilog = NULL; 600503ad85cSMatthew Ahrens dmu_objset_disown(zv->zv_objset, zvol_tag); 601fa9e4066Sahrens zv->zv_objset = NULL; 602fa9e4066Sahrens } 603fa9e4066Sahrens 604e7cbe64fSgw int 605e7cbe64fSgw zvol_prealloc(zvol_state_t *zv) 606e7cbe64fSgw { 607e7cbe64fSgw objset_t *os = zv->zv_objset; 608e7cbe64fSgw dmu_tx_t *tx; 609e7cbe64fSgw uint64_t refd, avail, usedobjs, availobjs; 610e7cbe64fSgw uint64_t resid = zv->zv_volsize; 611e7cbe64fSgw uint64_t off = 0; 612e7cbe64fSgw 613e7cbe64fSgw /* Check the space usage before attempting to allocate the space */ 614e7cbe64fSgw dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 615e7cbe64fSgw if (avail < zv->zv_volsize) 616e7cbe64fSgw return (ENOSPC); 617e7cbe64fSgw 618e7cbe64fSgw /* Free old extents if they exist */ 619e7cbe64fSgw zvol_free_extents(zv); 620e7cbe64fSgw 621e7cbe64fSgw while (resid != 0) { 622e7cbe64fSgw int error; 623e7cbe64fSgw uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); 624e7cbe64fSgw 625e7cbe64fSgw tx = dmu_tx_create(os); 626e7cbe64fSgw dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 627e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 628e7cbe64fSgw if (error) { 629e7cbe64fSgw dmu_tx_abort(tx); 630cdb0ab79Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 631e7cbe64fSgw return (error); 632e7cbe64fSgw } 63382c9918fSTim Haley dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 634e7cbe64fSgw dmu_tx_commit(tx); 635e7cbe64fSgw off += bytes; 636e7cbe64fSgw resid -= bytes; 637e7cbe64fSgw } 638e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 639e7cbe64fSgw 640e7cbe64fSgw return (0); 641e7cbe64fSgw } 642e7cbe64fSgw 643e7cbe64fSgw int 644*681d9761SEric Taylor zvol_update_volsize(objset_t *os, uint64_t volsize) 645e7cbe64fSgw { 646e7cbe64fSgw dmu_tx_t *tx; 647e7cbe64fSgw int error; 648e7cbe64fSgw 649e7cbe64fSgw ASSERT(MUTEX_HELD(&zvol_state_lock)); 650e7cbe64fSgw 651*681d9761SEric Taylor tx = dmu_tx_create(os); 652e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 653e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 654e7cbe64fSgw if (error) { 655e7cbe64fSgw dmu_tx_abort(tx); 656e7cbe64fSgw return (error); 657e7cbe64fSgw } 658e7cbe64fSgw 659*681d9761SEric Taylor error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 660e7cbe64fSgw &volsize, tx); 661e7cbe64fSgw dmu_tx_commit(tx); 662e7cbe64fSgw 663e7cbe64fSgw if (error == 0) 664*681d9761SEric Taylor error = dmu_free_long_range(os, 665cdb0ab79Smaybee ZVOL_OBJ, volsize, DMU_OBJECT_END); 666*681d9761SEric Taylor return (error); 667*681d9761SEric Taylor } 668e7cbe64fSgw 669*681d9761SEric Taylor void 670*681d9761SEric Taylor zvol_remove_minors(const char *name) 671*681d9761SEric Taylor { 672*681d9761SEric Taylor zvol_state_t *zv; 673*681d9761SEric Taylor char *namebuf; 674*681d9761SEric Taylor minor_t minor; 675*681d9761SEric Taylor 676*681d9761SEric Taylor namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 677*681d9761SEric Taylor (void) strncpy(namebuf, name, strlen(name)); 678*681d9761SEric Taylor (void) strcat(namebuf, "/"); 679*681d9761SEric Taylor mutex_enter(&zvol_state_lock); 680*681d9761SEric Taylor for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 681*681d9761SEric Taylor 682*681d9761SEric Taylor zv = ddi_get_soft_state(zvol_state, minor); 683*681d9761SEric Taylor if (zv == NULL) 684*681d9761SEric Taylor continue; 685*681d9761SEric Taylor if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 686*681d9761SEric Taylor (void) zvol_remove_zv(zv); 687e7cbe64fSgw } 688*681d9761SEric Taylor kmem_free(namebuf, strlen(name) + 2); 689*681d9761SEric Taylor 690*681d9761SEric Taylor mutex_exit(&zvol_state_lock); 691e7cbe64fSgw } 692e7cbe64fSgw 693fa9e4066Sahrens int 69491ebeef5Sahrens zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 695fa9e4066Sahrens { 696*681d9761SEric Taylor zvol_state_t *zv = NULL; 697*681d9761SEric Taylor objset_t *os; 698fa9e4066Sahrens int error; 6995c5460e9Seschrock dmu_object_info_t doi; 700e7cbe64fSgw uint64_t old_volsize = 0ULL; 701*681d9761SEric Taylor uint64_t readonly; 702fa9e4066Sahrens 703fa9e4066Sahrens mutex_enter(&zvol_state_lock); 704*681d9761SEric Taylor zv = zvol_minor_lookup(name); 705*681d9761SEric Taylor if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 706*681d9761SEric Taylor mutex_exit(&zvol_state_lock); 707*681d9761SEric Taylor return (error); 708fa9e4066Sahrens } 709fa9e4066Sahrens 710*681d9761SEric Taylor if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 711e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 712bb0ade09Sahrens doi.doi_data_block_size)) != 0) 713bb0ade09Sahrens goto out; 7145c5460e9Seschrock 715*681d9761SEric Taylor VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, 716*681d9761SEric Taylor NULL) == 0); 717*681d9761SEric Taylor if (readonly) { 718bb0ade09Sahrens error = EROFS; 719bb0ade09Sahrens goto out; 720fa9e4066Sahrens } 721fa9e4066Sahrens 722*681d9761SEric Taylor error = zvol_update_volsize(os, volsize); 723e7cbe64fSgw /* 724e7cbe64fSgw * Reinitialize the dump area to the new size. If we 725*681d9761SEric Taylor * failed to resize the dump area then restore it back to 726*681d9761SEric Taylor * its original size. 727e7cbe64fSgw */ 728*681d9761SEric Taylor if (zv && error == 0) { 729*681d9761SEric Taylor if (zv->zv_flags & ZVOL_DUMPIFIED) { 730*681d9761SEric Taylor old_volsize = zv->zv_volsize; 731*681d9761SEric Taylor zv->zv_volsize = volsize; 732*681d9761SEric Taylor if ((error = zvol_dumpify(zv)) != 0 || 733*681d9761SEric Taylor (error = dumpvp_resize()) != 0) { 734*681d9761SEric Taylor (void) zvol_update_volsize(os, old_volsize); 735*681d9761SEric Taylor zv->zv_volsize = old_volsize; 736*681d9761SEric Taylor error = zvol_dumpify(zv); 737*681d9761SEric Taylor } 738*681d9761SEric Taylor } 739*681d9761SEric Taylor if (error == 0) { 740*681d9761SEric Taylor zv->zv_volsize = volsize; 741*681d9761SEric Taylor zvol_size_changed(volsize, maj, zv->zv_minor); 742e7cbe64fSgw } 743fa9e4066Sahrens } 744fa9e4066Sahrens 745573ca77eSGeorge Wilson /* 746573ca77eSGeorge Wilson * Generate a LUN expansion event. 747573ca77eSGeorge Wilson */ 748*681d9761SEric Taylor if (zv && error == 0) { 749573ca77eSGeorge Wilson sysevent_id_t eid; 750573ca77eSGeorge Wilson nvlist_t *attr; 751573ca77eSGeorge Wilson char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 752573ca77eSGeorge Wilson 753*681d9761SEric Taylor (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 754573ca77eSGeorge Wilson zv->zv_minor); 755573ca77eSGeorge Wilson 756573ca77eSGeorge Wilson VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 757573ca77eSGeorge Wilson VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 758573ca77eSGeorge Wilson 759573ca77eSGeorge Wilson (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 760573ca77eSGeorge Wilson ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 761573ca77eSGeorge Wilson 762573ca77eSGeorge Wilson nvlist_free(attr); 763573ca77eSGeorge Wilson kmem_free(physpath, MAXPATHLEN); 764573ca77eSGeorge Wilson } 765573ca77eSGeorge Wilson 766bb0ade09Sahrens out: 767*681d9761SEric Taylor dmu_objset_rele(os, FTAG); 768bb0ade09Sahrens 769fa9e4066Sahrens mutex_exit(&zvol_state_lock); 770fa9e4066Sahrens 771fa9e4066Sahrens return (error); 772fa9e4066Sahrens } 773fa9e4066Sahrens 774fa9e4066Sahrens /*ARGSUSED*/ 775fa9e4066Sahrens int 776fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 777fa9e4066Sahrens { 778fa9e4066Sahrens minor_t minor = getminor(*devp); 779fa9e4066Sahrens zvol_state_t *zv; 780*681d9761SEric Taylor int err = 0; 781fa9e4066Sahrens 782fa9e4066Sahrens if (minor == 0) /* This is the control device */ 783fa9e4066Sahrens return (0); 784fa9e4066Sahrens 785fa9e4066Sahrens mutex_enter(&zvol_state_lock); 786fa9e4066Sahrens 787fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 788fa9e4066Sahrens if (zv == NULL) { 789fa9e4066Sahrens mutex_exit(&zvol_state_lock); 790fa9e4066Sahrens return (ENXIO); 791fa9e4066Sahrens } 792fa9e4066Sahrens 793*681d9761SEric Taylor if (zv->zv_total_opens == 0) 794*681d9761SEric Taylor err = zvol_first_open(zv); 795*681d9761SEric Taylor if (err) { 796fa9e4066Sahrens mutex_exit(&zvol_state_lock); 797*681d9761SEric Taylor return (err); 798*681d9761SEric Taylor } 799*681d9761SEric Taylor if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 800*681d9761SEric Taylor err = EROFS; 801*681d9761SEric Taylor goto out; 802fa9e4066Sahrens } 803c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 804*681d9761SEric Taylor err = EBUSY; 805*681d9761SEric Taylor goto out; 806c7f714e2SEric Taylor } 807c7f714e2SEric Taylor if (flag & FEXCL) { 808c7f714e2SEric Taylor if (zv->zv_total_opens != 0) { 809*681d9761SEric Taylor err = EBUSY; 810*681d9761SEric Taylor goto out; 811c7f714e2SEric Taylor } 812c7f714e2SEric Taylor zv->zv_flags |= ZVOL_EXCL; 813c7f714e2SEric Taylor } 814fa9e4066Sahrens 815fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 816fa9e4066Sahrens zv->zv_open_count[otyp]++; 817fa9e4066Sahrens zv->zv_total_opens++; 818fa9e4066Sahrens } 819fa9e4066Sahrens mutex_exit(&zvol_state_lock); 820fa9e4066Sahrens 821*681d9761SEric Taylor return (err); 822*681d9761SEric Taylor out: 823*681d9761SEric Taylor if (zv->zv_total_opens == 0) 824*681d9761SEric Taylor zvol_last_close(zv); 825*681d9761SEric Taylor mutex_exit(&zvol_state_lock); 826*681d9761SEric Taylor return (err); 827fa9e4066Sahrens } 828fa9e4066Sahrens 829fa9e4066Sahrens /*ARGSUSED*/ 830fa9e4066Sahrens int 831fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 832fa9e4066Sahrens { 833fa9e4066Sahrens minor_t minor = getminor(dev); 834fa9e4066Sahrens zvol_state_t *zv; 835*681d9761SEric Taylor int error = 0; 836fa9e4066Sahrens 837fa9e4066Sahrens if (minor == 0) /* This is the control device */ 838fa9e4066Sahrens return (0); 839fa9e4066Sahrens 840fa9e4066Sahrens mutex_enter(&zvol_state_lock); 841fa9e4066Sahrens 842fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 843fa9e4066Sahrens if (zv == NULL) { 844fa9e4066Sahrens mutex_exit(&zvol_state_lock); 845fa9e4066Sahrens return (ENXIO); 846fa9e4066Sahrens } 847fa9e4066Sahrens 848c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 849c7f714e2SEric Taylor ASSERT(zv->zv_total_opens == 1); 850c7f714e2SEric Taylor zv->zv_flags &= ~ZVOL_EXCL; 851fa9e4066Sahrens } 852fa9e4066Sahrens 853fa9e4066Sahrens /* 854fa9e4066Sahrens * If the open count is zero, this is a spurious close. 855fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 856fa9e4066Sahrens */ 857fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 858fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 859fa9e4066Sahrens 860fa9e4066Sahrens /* 861fa9e4066Sahrens * You may get multiple opens, but only one close. 862fa9e4066Sahrens */ 863fa9e4066Sahrens zv->zv_open_count[otyp]--; 864fa9e4066Sahrens zv->zv_total_opens--; 865fa9e4066Sahrens 866*681d9761SEric Taylor if (zv->zv_total_opens == 0) 867*681d9761SEric Taylor zvol_last_close(zv); 868fa9e4066Sahrens 869*681d9761SEric Taylor mutex_exit(&zvol_state_lock); 870*681d9761SEric Taylor return (error); 871fa9e4066Sahrens } 872fa9e4066Sahrens 873feb08c6bSbillm static void 87467bd71c6Sperrin zvol_get_done(dmu_buf_t *db, void *vzgd) 87567bd71c6Sperrin { 87667bd71c6Sperrin zgd_t *zgd = (zgd_t *)vzgd; 877c2e6a7d6Sperrin rl_t *rl = zgd->zgd_rl; 87867bd71c6Sperrin 87967bd71c6Sperrin dmu_buf_rele(db, vzgd); 880c2e6a7d6Sperrin zfs_range_unlock(rl); 88117f17c2dSbonwick zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 88267bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 88367bd71c6Sperrin } 88467bd71c6Sperrin 88567bd71c6Sperrin /* 88667bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 88767bd71c6Sperrin */ 888feb08c6bSbillm static int 88967bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 89067bd71c6Sperrin { 89167bd71c6Sperrin zvol_state_t *zv = arg; 89267bd71c6Sperrin objset_t *os = zv->zv_objset; 89367bd71c6Sperrin dmu_buf_t *db; 894c2e6a7d6Sperrin rl_t *rl; 89567bd71c6Sperrin zgd_t *zgd; 896c2e6a7d6Sperrin uint64_t boff; /* block starting offset */ 897c2e6a7d6Sperrin int dlen = lr->lr_length; /* length of user data */ 89867bd71c6Sperrin int error; 89967bd71c6Sperrin 90067bd71c6Sperrin ASSERT(zio); 901c2e6a7d6Sperrin ASSERT(dlen != 0); 902feb08c6bSbillm 903c2e6a7d6Sperrin /* 904c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 905c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 906c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 907c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 908c2e6a7d6Sperrin * we don't have to write the data twice. 909c2e6a7d6Sperrin */ 910c2e6a7d6Sperrin if (buf != NULL) /* immediate write */ 9117bfdf011SNeil Perrin return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf, 9127bfdf011SNeil Perrin DMU_READ_NO_PREFETCH)); 91367bd71c6Sperrin 91467bd71c6Sperrin zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); 91567bd71c6Sperrin zgd->zgd_zilog = zv->zv_zilog; 91667bd71c6Sperrin zgd->zgd_bp = &lr->lr_blkptr; 91767bd71c6Sperrin 91867bd71c6Sperrin /* 919c2e6a7d6Sperrin * Lock the range of the block to ensure that when the data is 920e7cbe64fSgw * written out and its checksum is being calculated that no other 921c2e6a7d6Sperrin * thread can change the block. 92267bd71c6Sperrin */ 923c2e6a7d6Sperrin boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t); 924c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize, 925c2e6a7d6Sperrin RL_READER); 926c2e6a7d6Sperrin zgd->zgd_rl = rl; 927c2e6a7d6Sperrin 928c2e6a7d6Sperrin VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); 92967bd71c6Sperrin error = dmu_sync(zio, db, &lr->lr_blkptr, 93067bd71c6Sperrin lr->lr_common.lrc_txg, zvol_get_done, zgd); 931feb08c6bSbillm if (error == 0) 93217f17c2dSbonwick zil_add_block(zv->zv_zilog, &lr->lr_blkptr); 93367bd71c6Sperrin /* 93467bd71c6Sperrin * If we get EINPROGRESS, then we need to wait for a 93567bd71c6Sperrin * write IO initiated by dmu_sync() to complete before 93667bd71c6Sperrin * we can release this dbuf. We will finish everything 93767bd71c6Sperrin * up in the zvol_get_done() callback. 93867bd71c6Sperrin */ 93967bd71c6Sperrin if (error == EINPROGRESS) 94067bd71c6Sperrin return (0); 94167bd71c6Sperrin dmu_buf_rele(db, zgd); 942c2e6a7d6Sperrin zfs_range_unlock(rl); 94367bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 94467bd71c6Sperrin return (error); 94567bd71c6Sperrin } 94667bd71c6Sperrin 947a24e15ceSperrin /* 948a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 94922ac5be4Sperrin * 95022ac5be4Sperrin * We store data in the log buffers if it's small enough. 95167bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 95222ac5be4Sperrin */ 95367bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 95422ac5be4Sperrin 955feb08c6bSbillm static void 956510b6c0eSNeil Perrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 957510b6c0eSNeil Perrin boolean_t sync) 95822ac5be4Sperrin { 959feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 9601209a471SNeil Perrin zilog_t *zilog = zv->zv_zilog; 961510b6c0eSNeil Perrin boolean_t slogging; 962e09fa4daSNeil Perrin ssize_t immediate_write_sz; 963510b6c0eSNeil Perrin 964510b6c0eSNeil Perrin if (zil_disable) 965510b6c0eSNeil Perrin return; 96622ac5be4Sperrin 9671209a471SNeil Perrin if (zilog->zl_replay) { 9681209a471SNeil Perrin dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx); 9691209a471SNeil Perrin zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] = 9701209a471SNeil Perrin zilog->zl_replaying_seq; 9711209a471SNeil Perrin return; 9721209a471SNeil Perrin } 9731209a471SNeil Perrin 974e09fa4daSNeil Perrin immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 975e09fa4daSNeil Perrin ? 0 : zvol_immediate_write_sz; 976e09fa4daSNeil Perrin 977e09fa4daSNeil Perrin slogging = spa_has_slogs(zilog->zl_spa) && 978e09fa4daSNeil Perrin (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); 979feb08c6bSbillm 980510b6c0eSNeil Perrin while (resid) { 981510b6c0eSNeil Perrin itx_t *itx; 982510b6c0eSNeil Perrin lr_write_t *lr; 983510b6c0eSNeil Perrin ssize_t len; 984510b6c0eSNeil Perrin itx_wr_state_t write_state; 985510b6c0eSNeil Perrin 986510b6c0eSNeil Perrin /* 987510b6c0eSNeil Perrin * Unlike zfs_log_write() we can be called with 988510b6c0eSNeil Perrin * upto DMU_MAX_ACCESS/2 (5MB) writes. 989510b6c0eSNeil Perrin */ 990e09fa4daSNeil Perrin if (blocksize > immediate_write_sz && !slogging && 991510b6c0eSNeil Perrin resid >= blocksize && off % blocksize == 0) { 992510b6c0eSNeil Perrin write_state = WR_INDIRECT; /* uses dmu_sync */ 993510b6c0eSNeil Perrin len = blocksize; 994510b6c0eSNeil Perrin } else if (sync) { 995510b6c0eSNeil Perrin write_state = WR_COPIED; 996510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 997510b6c0eSNeil Perrin } else { 998510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 999510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1000510b6c0eSNeil Perrin } 1001510b6c0eSNeil Perrin 1002510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1003510b6c0eSNeil Perrin (write_state == WR_COPIED ? len : 0)); 1004feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 1005510b6c0eSNeil Perrin if (write_state == WR_COPIED && dmu_read(zv->zv_objset, 10067bfdf011SNeil Perrin ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1007510b6c0eSNeil Perrin kmem_free(itx, offsetof(itx_t, itx_lr) + 1008510b6c0eSNeil Perrin itx->itx_lr.lrc_reclen); 1009510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1010510b6c0eSNeil Perrin lr = (lr_write_t *)&itx->itx_lr; 1011510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1012510b6c0eSNeil Perrin } 1013510b6c0eSNeil Perrin 1014510b6c0eSNeil Perrin itx->itx_wr_state = write_state; 1015510b6c0eSNeil Perrin if (write_state == WR_NEED_COPY) 1016510b6c0eSNeil Perrin itx->itx_sod += len; 1017feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 1018feb08c6bSbillm lr->lr_offset = off; 1019510b6c0eSNeil Perrin lr->lr_length = len; 1020feb08c6bSbillm lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t); 1021feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 1022feb08c6bSbillm 1023510b6c0eSNeil Perrin itx->itx_private = zv; 1024510b6c0eSNeil Perrin itx->itx_sync = sync; 1025510b6c0eSNeil Perrin 10261209a471SNeil Perrin (void) zil_itx_assign(zilog, itx, tx); 1027510b6c0eSNeil Perrin 1028510b6c0eSNeil Perrin off += len; 1029510b6c0eSNeil Perrin resid -= len; 103022ac5be4Sperrin } 103122ac5be4Sperrin } 103222ac5be4Sperrin 103388b7b0f2SMatthew Ahrens static int 103488b7b0f2SMatthew Ahrens zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 103588b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1036e7cbe64fSgw { 1037e7cbe64fSgw vdev_disk_t *dvd; 1038e7cbe64fSgw int c; 1039e7cbe64fSgw int numerrors = 0; 1040e7cbe64fSgw 1041e7cbe64fSgw for (c = 0; c < vd->vdev_children; c++) { 104221ecdf64SLin Ling ASSERT(vd->vdev_ops == &vdev_mirror_ops || 104321ecdf64SLin Ling vd->vdev_ops == &vdev_replacing_ops || 104421ecdf64SLin Ling vd->vdev_ops == &vdev_spare_ops); 104588b7b0f2SMatthew Ahrens int err = zvol_dumpio_vdev(vd->vdev_child[c], 104688b7b0f2SMatthew Ahrens addr, offset, size, doread, isdump); 104788b7b0f2SMatthew Ahrens if (err != 0) { 1048e7cbe64fSgw numerrors++; 104988b7b0f2SMatthew Ahrens } else if (doread) { 1050e7cbe64fSgw break; 1051e7cbe64fSgw } 1052e7cbe64fSgw } 1053e7cbe64fSgw 1054e7cbe64fSgw if (!vd->vdev_ops->vdev_op_leaf) 1055e7cbe64fSgw return (numerrors < vd->vdev_children ? 0 : EIO); 1056e7cbe64fSgw 1057dc0bb255SEric Taylor if (doread && !vdev_readable(vd)) 1058dc0bb255SEric Taylor return (EIO); 1059dc0bb255SEric Taylor else if (!doread && !vdev_writeable(vd)) 1060e7cbe64fSgw return (EIO); 1061e7cbe64fSgw 1062e7cbe64fSgw dvd = vd->vdev_tsd; 1063e7cbe64fSgw ASSERT3P(dvd, !=, NULL); 1064e7cbe64fSgw offset += VDEV_LABEL_START_SIZE; 1065e7cbe64fSgw 1066e7cbe64fSgw if (ddi_in_panic() || isdump) { 106788b7b0f2SMatthew Ahrens ASSERT(!doread); 106888b7b0f2SMatthew Ahrens if (doread) 1069e7cbe64fSgw return (EIO); 1070e7cbe64fSgw return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1071e7cbe64fSgw lbtodb(size))); 1072e7cbe64fSgw } else { 1073e7cbe64fSgw return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 107488b7b0f2SMatthew Ahrens doread ? B_READ : B_WRITE)); 1075e7cbe64fSgw } 1076e7cbe64fSgw } 1077e7cbe64fSgw 107888b7b0f2SMatthew Ahrens static int 107988b7b0f2SMatthew Ahrens zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 108088b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1081e7cbe64fSgw { 1082e7cbe64fSgw vdev_t *vd; 1083e7cbe64fSgw int error; 108488b7b0f2SMatthew Ahrens zvol_extent_t *ze; 1085e7cbe64fSgw spa_t *spa = dmu_objset_spa(zv->zv_objset); 1086e7cbe64fSgw 108788b7b0f2SMatthew Ahrens /* Must be sector aligned, and not stradle a block boundary. */ 108888b7b0f2SMatthew Ahrens if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 108988b7b0f2SMatthew Ahrens P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1090e7cbe64fSgw return (EINVAL); 109188b7b0f2SMatthew Ahrens } 109288b7b0f2SMatthew Ahrens ASSERT(size <= zv->zv_volblocksize); 1093e7cbe64fSgw 109488b7b0f2SMatthew Ahrens /* Locate the extent this belongs to */ 109588b7b0f2SMatthew Ahrens ze = list_head(&zv->zv_extents); 109688b7b0f2SMatthew Ahrens while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 109788b7b0f2SMatthew Ahrens offset -= ze->ze_nblks * zv->zv_volblocksize; 109888b7b0f2SMatthew Ahrens ze = list_next(&zv->zv_extents, ze); 109988b7b0f2SMatthew Ahrens } 1100e14bb325SJeff Bonwick spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 110188b7b0f2SMatthew Ahrens vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 110288b7b0f2SMatthew Ahrens offset += DVA_GET_OFFSET(&ze->ze_dva); 110388b7b0f2SMatthew Ahrens error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 1104e14bb325SJeff Bonwick spa_config_exit(spa, SCL_STATE, FTAG); 1105e7cbe64fSgw return (error); 1106e7cbe64fSgw } 1107e7cbe64fSgw 1108fa9e4066Sahrens int 1109fa9e4066Sahrens zvol_strategy(buf_t *bp) 1110fa9e4066Sahrens { 1111fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 1112fa9e4066Sahrens uint64_t off, volsize; 111388b7b0f2SMatthew Ahrens size_t resid; 1114fa9e4066Sahrens char *addr; 111522ac5be4Sperrin objset_t *os; 1116c2e6a7d6Sperrin rl_t *rl; 1117fa9e4066Sahrens int error = 0; 111888b7b0f2SMatthew Ahrens boolean_t doread = bp->b_flags & B_READ; 111988b7b0f2SMatthew Ahrens boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 1120510b6c0eSNeil Perrin boolean_t sync; 1121fa9e4066Sahrens 1122fa9e4066Sahrens if (zv == NULL) { 1123fa9e4066Sahrens bioerror(bp, ENXIO); 1124fa9e4066Sahrens biodone(bp); 1125fa9e4066Sahrens return (0); 1126fa9e4066Sahrens } 1127fa9e4066Sahrens 1128fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 1129fa9e4066Sahrens bioerror(bp, EINVAL); 1130fa9e4066Sahrens biodone(bp); 1131fa9e4066Sahrens return (0); 1132fa9e4066Sahrens } 1133fa9e4066Sahrens 1134*681d9761SEric Taylor if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1135fa9e4066Sahrens bioerror(bp, EROFS); 1136fa9e4066Sahrens biodone(bp); 1137fa9e4066Sahrens return (0); 1138fa9e4066Sahrens } 1139fa9e4066Sahrens 1140fa9e4066Sahrens off = ldbtob(bp->b_blkno); 1141fa9e4066Sahrens volsize = zv->zv_volsize; 1142fa9e4066Sahrens 114322ac5be4Sperrin os = zv->zv_objset; 114422ac5be4Sperrin ASSERT(os != NULL); 1145fa9e4066Sahrens 1146fa9e4066Sahrens bp_mapin(bp); 1147fa9e4066Sahrens addr = bp->b_un.b_addr; 1148fa9e4066Sahrens resid = bp->b_bcount; 1149fa9e4066Sahrens 115088b7b0f2SMatthew Ahrens if (resid > 0 && (off < 0 || off >= volsize)) { 115188b7b0f2SMatthew Ahrens bioerror(bp, EIO); 115288b7b0f2SMatthew Ahrens biodone(bp); 115388b7b0f2SMatthew Ahrens return (0); 115488b7b0f2SMatthew Ahrens } 115573ec3d9cSgw 1156510b6c0eSNeil Perrin sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump && 1157510b6c0eSNeil Perrin !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1158510b6c0eSNeil Perrin 1159a24e15ceSperrin /* 1160a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 1161a24e15ceSperrin * we can't change the data whilst calculating the checksum. 1162a24e15ceSperrin */ 1163c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 116488b7b0f2SMatthew Ahrens doread ? RL_READER : RL_WRITER); 1165fa9e4066Sahrens 1166e7cbe64fSgw while (resid != 0 && off < volsize) { 116788b7b0f2SMatthew Ahrens size_t size = MIN(resid, zvol_maxphys); 1168e7cbe64fSgw if (is_dump) { 1169e7cbe64fSgw size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 117088b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, off, size, 117188b7b0f2SMatthew Ahrens doread, B_FALSE); 117288b7b0f2SMatthew Ahrens } else if (doread) { 11737bfdf011SNeil Perrin error = dmu_read(os, ZVOL_OBJ, off, size, addr, 11747bfdf011SNeil Perrin DMU_READ_PREFETCH); 1175fa9e4066Sahrens } else { 117622ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 1177fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1178fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 1179fa9e4066Sahrens if (error) { 1180fa9e4066Sahrens dmu_tx_abort(tx); 1181fa9e4066Sahrens } else { 118222ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1183510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, size, sync); 1184fa9e4066Sahrens dmu_tx_commit(tx); 1185fa9e4066Sahrens } 1186fa9e4066Sahrens } 1187b87f3af3Sperrin if (error) { 1188b87f3af3Sperrin /* convert checksum errors into IO errors */ 1189b87f3af3Sperrin if (error == ECKSUM) 1190b87f3af3Sperrin error = EIO; 1191fa9e4066Sahrens break; 1192b87f3af3Sperrin } 1193fa9e4066Sahrens off += size; 1194fa9e4066Sahrens addr += size; 1195fa9e4066Sahrens resid -= size; 1196fa9e4066Sahrens } 1197c2e6a7d6Sperrin zfs_range_unlock(rl); 1198fa9e4066Sahrens 1199fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 1200fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 1201fa9e4066Sahrens 1202510b6c0eSNeil Perrin if (sync) 1203feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1204feb08c6bSbillm biodone(bp); 120522ac5be4Sperrin 1206fa9e4066Sahrens return (0); 1207fa9e4066Sahrens } 1208fa9e4066Sahrens 120967bd71c6Sperrin /* 121067bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 121167bd71c6Sperrin * Using our own routine instead of the default minphys() 121267bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 121367bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 121467bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 121567bd71c6Sperrin * 56K on X86 and 128K on sparc). 121667bd71c6Sperrin */ 121767bd71c6Sperrin void 121867bd71c6Sperrin zvol_minphys(struct buf *bp) 121967bd71c6Sperrin { 122067bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 122167bd71c6Sperrin bp->b_bcount = zvol_maxphys; 122267bd71c6Sperrin } 122367bd71c6Sperrin 1224e7cbe64fSgw int 1225e7cbe64fSgw zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1226e7cbe64fSgw { 1227e7cbe64fSgw minor_t minor = getminor(dev); 1228e7cbe64fSgw zvol_state_t *zv; 1229e7cbe64fSgw int error = 0; 1230e7cbe64fSgw uint64_t size; 1231e7cbe64fSgw uint64_t boff; 1232e7cbe64fSgw uint64_t resid; 1233e7cbe64fSgw 1234e7cbe64fSgw if (minor == 0) /* This is the control device */ 1235e7cbe64fSgw return (ENXIO); 1236e7cbe64fSgw 1237e7cbe64fSgw zv = ddi_get_soft_state(zvol_state, minor); 1238e7cbe64fSgw if (zv == NULL) 1239e7cbe64fSgw return (ENXIO); 1240e7cbe64fSgw 1241e7cbe64fSgw boff = ldbtob(blkno); 1242e7cbe64fSgw resid = ldbtob(nblocks); 124388b7b0f2SMatthew Ahrens 124488b7b0f2SMatthew Ahrens VERIFY3U(boff + resid, <=, zv->zv_volsize); 124588b7b0f2SMatthew Ahrens 1246e7cbe64fSgw while (resid) { 1247e7cbe64fSgw size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 124888b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1249e7cbe64fSgw if (error) 1250e7cbe64fSgw break; 1251e7cbe64fSgw boff += size; 1252e7cbe64fSgw addr += size; 1253e7cbe64fSgw resid -= size; 1254e7cbe64fSgw } 1255e7cbe64fSgw 1256e7cbe64fSgw return (error); 1257e7cbe64fSgw } 1258e7cbe64fSgw 1259fa9e4066Sahrens /*ARGSUSED*/ 1260fa9e4066Sahrens int 1261feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1262fa9e4066Sahrens { 1263c7ca1008Sgw minor_t minor = getminor(dev); 1264c7ca1008Sgw zvol_state_t *zv; 126573ec3d9cSgw uint64_t volsize; 1266c2e6a7d6Sperrin rl_t *rl; 1267feb08c6bSbillm int error = 0; 1268fa9e4066Sahrens 1269c7ca1008Sgw if (minor == 0) /* This is the control device */ 1270c7ca1008Sgw return (ENXIO); 1271c7ca1008Sgw 1272c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1273c7ca1008Sgw if (zv == NULL) 1274c7ca1008Sgw return (ENXIO); 1275c7ca1008Sgw 127673ec3d9cSgw volsize = zv->zv_volsize; 127773ec3d9cSgw if (uio->uio_resid > 0 && 127873ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 127973ec3d9cSgw return (EIO); 128073ec3d9cSgw 128188b7b0f2SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 128288b7b0f2SMatthew Ahrens error = physio(zvol_strategy, NULL, dev, B_READ, 128388b7b0f2SMatthew Ahrens zvol_minphys, uio); 128488b7b0f2SMatthew Ahrens return (error); 128588b7b0f2SMatthew Ahrens } 128688b7b0f2SMatthew Ahrens 1287c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1288c2e6a7d6Sperrin RL_READER); 128973ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1290feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1291fa9e4066Sahrens 129273ec3d9cSgw /* don't read past the end */ 129373ec3d9cSgw if (bytes > volsize - uio->uio_loffset) 129473ec3d9cSgw bytes = volsize - uio->uio_loffset; 129573ec3d9cSgw 1296feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1297b87f3af3Sperrin if (error) { 1298b87f3af3Sperrin /* convert checksum errors into IO errors */ 1299b87f3af3Sperrin if (error == ECKSUM) 1300b87f3af3Sperrin error = EIO; 1301feb08c6bSbillm break; 1302b87f3af3Sperrin } 1303feb08c6bSbillm } 1304c2e6a7d6Sperrin zfs_range_unlock(rl); 1305feb08c6bSbillm return (error); 1306fa9e4066Sahrens } 1307fa9e4066Sahrens 1308fa9e4066Sahrens /*ARGSUSED*/ 1309fa9e4066Sahrens int 1310feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1311fa9e4066Sahrens { 1312c7ca1008Sgw minor_t minor = getminor(dev); 1313c7ca1008Sgw zvol_state_t *zv; 131473ec3d9cSgw uint64_t volsize; 1315c2e6a7d6Sperrin rl_t *rl; 1316feb08c6bSbillm int error = 0; 1317510b6c0eSNeil Perrin boolean_t sync; 1318feb08c6bSbillm 1319c7ca1008Sgw if (minor == 0) /* This is the control device */ 1320c7ca1008Sgw return (ENXIO); 1321c7ca1008Sgw 1322c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 1323c7ca1008Sgw if (zv == NULL) 1324c7ca1008Sgw return (ENXIO); 1325c7ca1008Sgw 132673ec3d9cSgw volsize = zv->zv_volsize; 132773ec3d9cSgw if (uio->uio_resid > 0 && 132873ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 132973ec3d9cSgw return (EIO); 133073ec3d9cSgw 1331e7cbe64fSgw if (zv->zv_flags & ZVOL_DUMPIFIED) { 1332e7cbe64fSgw error = physio(zvol_strategy, NULL, dev, B_WRITE, 1333e7cbe64fSgw zvol_minphys, uio); 1334e7cbe64fSgw return (error); 1335e7cbe64fSgw } 1336e7cbe64fSgw 1337510b6c0eSNeil Perrin sync = !(zv->zv_flags & ZVOL_WCE) && !zil_disable; 1338510b6c0eSNeil Perrin 1339c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1340c2e6a7d6Sperrin RL_WRITER); 134173ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1342feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1343feb08c6bSbillm uint64_t off = uio->uio_loffset; 1344feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 134573ec3d9cSgw 134673ec3d9cSgw if (bytes > volsize - off) /* don't write past the end */ 134773ec3d9cSgw bytes = volsize - off; 134873ec3d9cSgw 1349feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1350feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 1351feb08c6bSbillm if (error) { 1352feb08c6bSbillm dmu_tx_abort(tx); 1353feb08c6bSbillm break; 1354feb08c6bSbillm } 1355feb08c6bSbillm error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); 1356feb08c6bSbillm if (error == 0) 1357510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, bytes, sync); 1358feb08c6bSbillm dmu_tx_commit(tx); 1359feb08c6bSbillm 1360feb08c6bSbillm if (error) 1361feb08c6bSbillm break; 1362feb08c6bSbillm } 1363c2e6a7d6Sperrin zfs_range_unlock(rl); 1364510b6c0eSNeil Perrin if (sync) 1365e08bf2c6SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1366feb08c6bSbillm return (error); 1367fa9e4066Sahrens } 1368fa9e4066Sahrens 1369c7f714e2SEric Taylor int 1370c7f714e2SEric Taylor zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1371c7f714e2SEric Taylor { 1372c7f714e2SEric Taylor struct uuid uuid = EFI_RESERVED; 1373c7f714e2SEric Taylor efi_gpe_t gpe = { 0 }; 1374c7f714e2SEric Taylor uint32_t crc; 1375c7f714e2SEric Taylor dk_efi_t efi; 1376c7f714e2SEric Taylor int length; 1377c7f714e2SEric Taylor char *ptr; 1378c7f714e2SEric Taylor 1379c7f714e2SEric Taylor if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1380c7f714e2SEric Taylor return (EFAULT); 1381c7f714e2SEric Taylor ptr = (char *)(uintptr_t)efi.dki_data_64; 1382c7f714e2SEric Taylor length = efi.dki_length; 1383c7f714e2SEric Taylor /* 1384c7f714e2SEric Taylor * Some clients may attempt to request a PMBR for the 1385c7f714e2SEric Taylor * zvol. Currently this interface will return EINVAL to 1386c7f714e2SEric Taylor * such requests. These requests could be supported by 1387c7f714e2SEric Taylor * adding a check for lba == 0 and consing up an appropriate 1388c7f714e2SEric Taylor * PMBR. 1389c7f714e2SEric Taylor */ 1390c7f714e2SEric Taylor if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1391c7f714e2SEric Taylor return (EINVAL); 1392c7f714e2SEric Taylor 1393c7f714e2SEric Taylor gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1394c7f714e2SEric Taylor gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1395c7f714e2SEric Taylor UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1396c7f714e2SEric Taylor 1397c7f714e2SEric Taylor if (efi.dki_lba == 1) { 1398c7f714e2SEric Taylor efi_gpt_t gpt = { 0 }; 1399c7f714e2SEric Taylor 1400c7f714e2SEric Taylor gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1401c7f714e2SEric Taylor gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1402c7f714e2SEric Taylor gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1403c7f714e2SEric Taylor gpt.efi_gpt_MyLBA = LE_64(1ULL); 1404c7f714e2SEric Taylor gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1405c7f714e2SEric Taylor gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1406c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1407c7f714e2SEric Taylor gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1408c7f714e2SEric Taylor gpt.efi_gpt_SizeOfPartitionEntry = 1409c7f714e2SEric Taylor LE_32(sizeof (efi_gpe_t)); 1410c7f714e2SEric Taylor CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1411c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1412c7f714e2SEric Taylor CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1413c7f714e2SEric Taylor gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1414c7f714e2SEric Taylor if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1415c7f714e2SEric Taylor flag)) 1416c7f714e2SEric Taylor return (EFAULT); 1417c7f714e2SEric Taylor ptr += sizeof (gpt); 1418c7f714e2SEric Taylor length -= sizeof (gpt); 1419c7f714e2SEric Taylor } 1420c7f714e2SEric Taylor if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1421c7f714e2SEric Taylor length), flag)) 1422c7f714e2SEric Taylor return (EFAULT); 1423c7f714e2SEric Taylor return (0); 1424c7f714e2SEric Taylor } 1425c7f714e2SEric Taylor 1426fa9e4066Sahrens /* 1427fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1428fa9e4066Sahrens */ 1429fa9e4066Sahrens /*ARGSUSED*/ 1430fa9e4066Sahrens int 1431fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1432fa9e4066Sahrens { 1433fa9e4066Sahrens zvol_state_t *zv; 1434af2c4821Smaybee struct dk_cinfo dki; 1435fa9e4066Sahrens struct dk_minfo dkm; 1436af2c4821Smaybee struct dk_callback *dkc; 1437fa9e4066Sahrens int error = 0; 1438e7cbe64fSgw rl_t *rl; 1439fa9e4066Sahrens 1440fa9e4066Sahrens mutex_enter(&zvol_state_lock); 1441fa9e4066Sahrens 1442fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 1443fa9e4066Sahrens 1444fa9e4066Sahrens if (zv == NULL) { 1445fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1446fa9e4066Sahrens return (ENXIO); 1447fa9e4066Sahrens } 1448701f66c4SEric Taylor ASSERT(zv->zv_total_opens > 0); 1449fa9e4066Sahrens 1450fa9e4066Sahrens switch (cmd) { 1451fa9e4066Sahrens 1452fa9e4066Sahrens case DKIOCINFO: 1453af2c4821Smaybee bzero(&dki, sizeof (dki)); 1454af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1455af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1456af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 1457af2c4821Smaybee dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1458fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1459af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1460fa9e4066Sahrens error = EFAULT; 1461fa9e4066Sahrens return (error); 1462fa9e4066Sahrens 1463fa9e4066Sahrens case DKIOCGMEDIAINFO: 1464fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1465fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1466fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1467fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1468fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1469fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1470fa9e4066Sahrens error = EFAULT; 1471fa9e4066Sahrens return (error); 1472fa9e4066Sahrens 1473fa9e4066Sahrens case DKIOCGETEFI: 1474c7f714e2SEric Taylor { 1475c7f714e2SEric Taylor uint64_t vs = zv->zv_volsize; 1476c7f714e2SEric Taylor uint8_t bs = zv->zv_min_bs; 1477fa9e4066Sahrens 147868a5ac4dSmaybee mutex_exit(&zvol_state_lock); 1479c7f714e2SEric Taylor error = zvol_getefi((void *)arg, flag, vs, bs); 1480c7f714e2SEric Taylor return (error); 148168a5ac4dSmaybee } 1482fa9e4066Sahrens 1483feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1484af2c4821Smaybee dkc = (struct dk_callback *)arg; 1485701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1486feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1487af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1488af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1489af2c4821Smaybee error = 0; 1490af2c4821Smaybee } 1491701f66c4SEric Taylor return (error); 1492701f66c4SEric Taylor 1493701f66c4SEric Taylor case DKIOCGETWCE: 1494701f66c4SEric Taylor { 1495701f66c4SEric Taylor int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1496701f66c4SEric Taylor if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1497701f66c4SEric Taylor flag)) 1498701f66c4SEric Taylor error = EFAULT; 1499701f66c4SEric Taylor break; 1500701f66c4SEric Taylor } 1501701f66c4SEric Taylor case DKIOCSETWCE: 1502701f66c4SEric Taylor { 1503701f66c4SEric Taylor int wce; 1504701f66c4SEric Taylor if (ddi_copyin((void *)arg, &wce, sizeof (int), 1505701f66c4SEric Taylor flag)) { 1506701f66c4SEric Taylor error = EFAULT; 1507701f66c4SEric Taylor break; 1508701f66c4SEric Taylor } 1509701f66c4SEric Taylor if (wce) { 1510701f66c4SEric Taylor zv->zv_flags |= ZVOL_WCE; 1511701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1512701f66c4SEric Taylor } else { 1513701f66c4SEric Taylor zv->zv_flags &= ~ZVOL_WCE; 1514701f66c4SEric Taylor mutex_exit(&zvol_state_lock); 1515701f66c4SEric Taylor zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1516701f66c4SEric Taylor } 1517701f66c4SEric Taylor return (0); 1518701f66c4SEric Taylor } 1519feb08c6bSbillm 1520b6130eadSmaybee case DKIOCGGEOM: 1521b6130eadSmaybee case DKIOCGVTOC: 1522e7cbe64fSgw /* 1523e7cbe64fSgw * commands using these (like prtvtoc) expect ENOTSUP 1524e7cbe64fSgw * since we're emulating an EFI label 1525e7cbe64fSgw */ 1526b6130eadSmaybee error = ENOTSUP; 1527b6130eadSmaybee break; 1528b6130eadSmaybee 1529e7cbe64fSgw case DKIOCDUMPINIT: 1530e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1531e7cbe64fSgw RL_WRITER); 1532e7cbe64fSgw error = zvol_dumpify(zv); 1533e7cbe64fSgw zfs_range_unlock(rl); 1534e7cbe64fSgw break; 1535e7cbe64fSgw 1536e7cbe64fSgw case DKIOCDUMPFINI: 153706d5ae10SEric Taylor if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 153806d5ae10SEric Taylor break; 1539e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1540e7cbe64fSgw RL_WRITER); 1541e7cbe64fSgw error = zvol_dump_fini(zv); 1542e7cbe64fSgw zfs_range_unlock(rl); 1543e7cbe64fSgw break; 1544e7cbe64fSgw 1545fa9e4066Sahrens default: 154668a5ac4dSmaybee error = ENOTTY; 1547fa9e4066Sahrens break; 1548fa9e4066Sahrens 1549fa9e4066Sahrens } 1550fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1551fa9e4066Sahrens return (error); 1552fa9e4066Sahrens } 1553fa9e4066Sahrens 1554fa9e4066Sahrens int 1555fa9e4066Sahrens zvol_busy(void) 1556fa9e4066Sahrens { 1557fa9e4066Sahrens return (zvol_minors != 0); 1558fa9e4066Sahrens } 1559fa9e4066Sahrens 1560fa9e4066Sahrens void 1561fa9e4066Sahrens zvol_init(void) 1562fa9e4066Sahrens { 1563fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1564fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1565fa9e4066Sahrens } 1566fa9e4066Sahrens 1567fa9e4066Sahrens void 1568fa9e4066Sahrens zvol_fini(void) 1569fa9e4066Sahrens { 1570fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1571fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1572fa9e4066Sahrens } 1573e7cbe64fSgw 1574e7cbe64fSgw static int 1575e7cbe64fSgw zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1576e7cbe64fSgw { 1577e7cbe64fSgw dmu_tx_t *tx; 1578e7cbe64fSgw int error = 0; 1579e7cbe64fSgw objset_t *os = zv->zv_objset; 1580e7cbe64fSgw nvlist_t *nv = NULL; 1581e7cbe64fSgw 1582e7cbe64fSgw ASSERT(MUTEX_HELD(&zvol_state_lock)); 1583*681d9761SEric Taylor error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1584*681d9761SEric Taylor DMU_OBJECT_END); 1585*681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1586*681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1587e7cbe64fSgw 1588e7cbe64fSgw tx = dmu_tx_create(os); 1589e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1590*681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1591e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1592e7cbe64fSgw if (error) { 1593e7cbe64fSgw dmu_tx_abort(tx); 1594e7cbe64fSgw return (error); 1595e7cbe64fSgw } 1596e7cbe64fSgw 1597e7cbe64fSgw /* 1598e7cbe64fSgw * If we are resizing the dump device then we only need to 1599e7cbe64fSgw * update the refreservation to match the newly updated 1600e7cbe64fSgw * zvolsize. Otherwise, we save off the original state of the 1601e7cbe64fSgw * zvol so that we can restore them if the zvol is ever undumpified. 1602e7cbe64fSgw */ 1603e7cbe64fSgw if (resize) { 1604e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, 1605e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1606e7cbe64fSgw &zv->zv_volsize, tx); 1607e7cbe64fSgw } else { 160888b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 160988b7b0f2SMatthew Ahrens 1610e7cbe64fSgw error = dsl_prop_get_integer(zv->zv_name, 1611e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1612e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1613e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1614e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1615e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 161688b7b0f2SMatthew Ahrens error = error ? error : dsl_prop_get_integer(zv->zv_name, 161788b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 1618e7cbe64fSgw 1619e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1620e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1621e7cbe64fSgw &compress, tx); 1622e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1623e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1624e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1625e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1626e7cbe64fSgw &refresrv, tx); 162788b7b0f2SMatthew Ahrens error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 162888b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 162988b7b0f2SMatthew Ahrens &vbs, tx); 1630*681d9761SEric Taylor error = error ? error : dmu_object_set_blocksize( 1631*681d9761SEric Taylor os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx); 1632*681d9761SEric Taylor if (error == 0) 1633*681d9761SEric Taylor zv->zv_volblocksize = SPA_MAXBLOCKSIZE; 1634e7cbe64fSgw } 1635e7cbe64fSgw dmu_tx_commit(tx); 1636e7cbe64fSgw 1637e7cbe64fSgw /* 1638e7cbe64fSgw * We only need update the zvol's property if we are initializing 1639e7cbe64fSgw * the dump area for the first time. 1640e7cbe64fSgw */ 1641e7cbe64fSgw if (!resize) { 1642e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1643e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1644e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1645e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1646e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1647e7cbe64fSgw ZIO_COMPRESS_OFF) == 0); 1648e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1649e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1650e7cbe64fSgw ZIO_CHECKSUM_OFF) == 0); 1651e7cbe64fSgw 1652e7cbe64fSgw error = zfs_set_prop_nvlist(zv->zv_name, nv); 1653e7cbe64fSgw nvlist_free(nv); 1654e7cbe64fSgw 1655e7cbe64fSgw if (error) 1656e7cbe64fSgw return (error); 1657e7cbe64fSgw } 1658e7cbe64fSgw 1659e7cbe64fSgw /* Allocate the space for the dump */ 1660e7cbe64fSgw error = zvol_prealloc(zv); 1661e7cbe64fSgw return (error); 1662e7cbe64fSgw } 1663e7cbe64fSgw 1664e7cbe64fSgw static int 1665e7cbe64fSgw zvol_dumpify(zvol_state_t *zv) 1666e7cbe64fSgw { 1667e7cbe64fSgw int error = 0; 1668e7cbe64fSgw uint64_t dumpsize = 0; 1669e7cbe64fSgw dmu_tx_t *tx; 1670e7cbe64fSgw objset_t *os = zv->zv_objset; 1671e7cbe64fSgw 1672*681d9761SEric Taylor if (zv->zv_flags & ZVOL_RDONLY) 1673e7cbe64fSgw return (EROFS); 1674e7cbe64fSgw 1675e7cbe64fSgw if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1676e7cbe64fSgw 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 1677e7cbe64fSgw boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; 1678e7cbe64fSgw 1679e7cbe64fSgw if ((error = zvol_dump_init(zv, resize)) != 0) { 1680e7cbe64fSgw (void) zvol_dump_fini(zv); 1681e7cbe64fSgw return (error); 1682e7cbe64fSgw } 1683e7cbe64fSgw } 1684e7cbe64fSgw 1685e7cbe64fSgw /* 1686e7cbe64fSgw * Build up our lba mapping. 1687e7cbe64fSgw */ 1688e7cbe64fSgw error = zvol_get_lbas(zv); 1689e7cbe64fSgw if (error) { 1690e7cbe64fSgw (void) zvol_dump_fini(zv); 1691e7cbe64fSgw return (error); 1692e7cbe64fSgw } 1693e7cbe64fSgw 1694e7cbe64fSgw tx = dmu_tx_create(os); 1695e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1696e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1697e7cbe64fSgw if (error) { 1698e7cbe64fSgw dmu_tx_abort(tx); 1699e7cbe64fSgw (void) zvol_dump_fini(zv); 1700e7cbe64fSgw return (error); 1701e7cbe64fSgw } 1702e7cbe64fSgw 1703e7cbe64fSgw zv->zv_flags |= ZVOL_DUMPIFIED; 1704e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1705e7cbe64fSgw &zv->zv_volsize, tx); 1706e7cbe64fSgw dmu_tx_commit(tx); 1707e7cbe64fSgw 1708e7cbe64fSgw if (error) { 1709e7cbe64fSgw (void) zvol_dump_fini(zv); 1710e7cbe64fSgw return (error); 1711e7cbe64fSgw } 1712e7cbe64fSgw 1713e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 1714e7cbe64fSgw return (0); 1715e7cbe64fSgw } 1716e7cbe64fSgw 1717e7cbe64fSgw static int 1718e7cbe64fSgw zvol_dump_fini(zvol_state_t *zv) 1719e7cbe64fSgw { 1720e7cbe64fSgw dmu_tx_t *tx; 1721e7cbe64fSgw objset_t *os = zv->zv_objset; 1722e7cbe64fSgw nvlist_t *nv; 1723e7cbe64fSgw int error = 0; 172488b7b0f2SMatthew Ahrens uint64_t checksum, compress, refresrv, vbs; 1725e7cbe64fSgw 1726b7e50089Smaybee /* 1727b7e50089Smaybee * Attempt to restore the zvol back to its pre-dumpified state. 1728b7e50089Smaybee * This is a best-effort attempt as it's possible that not all 1729b7e50089Smaybee * of these properties were initialized during the dumpify process 1730b7e50089Smaybee * (i.e. error during zvol_dump_init). 1731b7e50089Smaybee */ 1732b7e50089Smaybee 1733e7cbe64fSgw tx = dmu_tx_create(os); 1734e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1735e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1736e7cbe64fSgw if (error) { 1737e7cbe64fSgw dmu_tx_abort(tx); 1738e7cbe64fSgw return (error); 1739e7cbe64fSgw } 1740b7e50089Smaybee (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1741b7e50089Smaybee dmu_tx_commit(tx); 1742e7cbe64fSgw 1743e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1744e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1745e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1746e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1747e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1748e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 174988b7b0f2SMatthew Ahrens (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 175088b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1751e7cbe64fSgw 1752e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1753e7cbe64fSgw (void) nvlist_add_uint64(nv, 1754e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1755e7cbe64fSgw (void) nvlist_add_uint64(nv, 1756e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1757e7cbe64fSgw (void) nvlist_add_uint64(nv, 1758e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 1759e7cbe64fSgw (void) zfs_set_prop_nvlist(zv->zv_name, nv); 1760e7cbe64fSgw nvlist_free(nv); 1761e7cbe64fSgw 1762b7e50089Smaybee zvol_free_extents(zv); 1763b7e50089Smaybee zv->zv_flags &= ~ZVOL_DUMPIFIED; 1764b7e50089Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 1765*681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1766*681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1767*681d9761SEric Taylor tx = dmu_tx_create(os); 1768*681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1769*681d9761SEric Taylor error = dmu_tx_assign(tx, TXG_WAIT); 1770*681d9761SEric Taylor if (error) { 1771*681d9761SEric Taylor dmu_tx_abort(tx); 1772*681d9761SEric Taylor return (error); 1773*681d9761SEric Taylor } 1774*681d9761SEric Taylor dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx); 1775*681d9761SEric Taylor dmu_tx_commit(tx); 1776b7e50089Smaybee 1777e7cbe64fSgw return (0); 1778e7cbe64fSgw } 1779