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 /* 22f80ce222SChris Kirby * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved. 23b77b9231SDan McDonald * 24b77b9231SDan McDonald * Portions Copyright 2010 Robert Milkowski 25b77b9231SDan McDonald * 26b77b9231SDan McDonald * Copyright 2011 Nexenta Systems, Inc. All rights reserved. 274445fffbSMatthew Ahrens * Copyright (c) 2012 by Delphix. All rights reserved. 28fa9e4066Sahrens */ 29fa9e4066Sahrens 30fa9e4066Sahrens /* 31fa9e4066Sahrens * ZFS volume emulation driver. 32fa9e4066Sahrens * 33fa9e4066Sahrens * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 34fa9e4066Sahrens * Volumes are accessed through the symbolic links named: 35fa9e4066Sahrens * 36fa9e4066Sahrens * /dev/zvol/dsk/<pool_name>/<dataset_name> 37fa9e4066Sahrens * /dev/zvol/rdsk/<pool_name>/<dataset_name> 38fa9e4066Sahrens * 39681d9761SEric Taylor * These links are created by the /dev filesystem (sdev_zvolops.c). 40fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 41fa9e4066Sahrens * run before opening and using a device. 42fa9e4066Sahrens */ 43fa9e4066Sahrens 44fa9e4066Sahrens #include <sys/types.h> 45fa9e4066Sahrens #include <sys/param.h> 46fa9e4066Sahrens #include <sys/errno.h> 47fa9e4066Sahrens #include <sys/uio.h> 48fa9e4066Sahrens #include <sys/buf.h> 49fa9e4066Sahrens #include <sys/modctl.h> 50fa9e4066Sahrens #include <sys/open.h> 51fa9e4066Sahrens #include <sys/kmem.h> 52fa9e4066Sahrens #include <sys/conf.h> 53fa9e4066Sahrens #include <sys/cmn_err.h> 54fa9e4066Sahrens #include <sys/stat.h> 55fa9e4066Sahrens #include <sys/zap.h> 56fa9e4066Sahrens #include <sys/spa.h> 57fa9e4066Sahrens #include <sys/zio.h> 58e7cbe64fSgw #include <sys/dmu_traverse.h> 59e7cbe64fSgw #include <sys/dnode.h> 60e7cbe64fSgw #include <sys/dsl_dataset.h> 61fa9e4066Sahrens #include <sys/dsl_prop.h> 62fa9e4066Sahrens #include <sys/dkio.h> 63fa9e4066Sahrens #include <sys/efi_partition.h> 64fa9e4066Sahrens #include <sys/byteorder.h> 65fa9e4066Sahrens #include <sys/pathname.h> 66fa9e4066Sahrens #include <sys/ddi.h> 67fa9e4066Sahrens #include <sys/sunddi.h> 68fa9e4066Sahrens #include <sys/crc32.h> 69fa9e4066Sahrens #include <sys/dirent.h> 70fa9e4066Sahrens #include <sys/policy.h> 71fa9e4066Sahrens #include <sys/fs/zfs.h> 72fa9e4066Sahrens #include <sys/zfs_ioctl.h> 73fa9e4066Sahrens #include <sys/mkdev.h> 7422ac5be4Sperrin #include <sys/zil.h> 75c5c6ffa0Smaybee #include <sys/refcount.h> 76c2e6a7d6Sperrin #include <sys/zfs_znode.h> 77c2e6a7d6Sperrin #include <sys/zfs_rlock.h> 78e7cbe64fSgw #include <sys/vdev_disk.h> 79e7cbe64fSgw #include <sys/vdev_impl.h> 80e7cbe64fSgw #include <sys/zvol.h> 81e7cbe64fSgw #include <sys/dumphdr.h> 821209a471SNeil Perrin #include <sys/zil_impl.h> 8380901aeaSGeorge Wilson #include <sys/dbuf.h> 84fa9e4066Sahrens 85fa9e4066Sahrens #include "zfs_namecheck.h" 86fa9e4066Sahrens 87c99e4bdcSChris Kirby void *zfsdev_state; 88503ad85cSMatthew Ahrens static char *zvol_tag = "zvol_tag"; 89fa9e4066Sahrens 90e7cbe64fSgw #define ZVOL_DUMPSIZE "dumpsize" 91e7cbe64fSgw 92fa9e4066Sahrens /* 93c99e4bdcSChris Kirby * This lock protects the zfsdev_state structure from being modified 94fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 95fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 96fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 97fa9e4066Sahrens */ 98c99e4bdcSChris Kirby kmutex_t zfsdev_state_lock; 99fa9e4066Sahrens static uint32_t zvol_minors; 100fa9e4066Sahrens 101e7cbe64fSgw typedef struct zvol_extent { 10288b7b0f2SMatthew Ahrens list_node_t ze_node; 103e7cbe64fSgw dva_t ze_dva; /* dva associated with this extent */ 10488b7b0f2SMatthew Ahrens uint64_t ze_nblks; /* number of blocks in extent */ 105e7cbe64fSgw } zvol_extent_t; 106e7cbe64fSgw 107fa9e4066Sahrens /* 108fa9e4066Sahrens * The in-core state of each volume. 109fa9e4066Sahrens */ 110fa9e4066Sahrens typedef struct zvol_state { 111fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 112fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 11367bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 114fa9e4066Sahrens minor_t zv_minor; /* minor number */ 115fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 116701f66c4SEric Taylor uint8_t zv_flags; /* readonly, dumpified, etc. */ 117fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 118fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 119fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 12022ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 12188b7b0f2SMatthew Ahrens list_t zv_extents; /* List of extents for dump */ 122c2e6a7d6Sperrin znode_t zv_znode; /* for range locking */ 12394d1a210STim Haley dmu_buf_t *zv_dbuf; /* bonus handle */ 124fa9e4066Sahrens } zvol_state_t; 125fa9e4066Sahrens 126e7cbe64fSgw /* 127e7cbe64fSgw * zvol specific flags 128e7cbe64fSgw */ 129e7cbe64fSgw #define ZVOL_RDONLY 0x1 130e7cbe64fSgw #define ZVOL_DUMPIFIED 0x2 131c7f714e2SEric Taylor #define ZVOL_EXCL 0x4 132701f66c4SEric Taylor #define ZVOL_WCE 0x8 133e7cbe64fSgw 13467bd71c6Sperrin /* 13567bd71c6Sperrin * zvol maximum transfer in one DMU tx. 13667bd71c6Sperrin */ 13767bd71c6Sperrin int zvol_maxphys = DMU_MAX_ACCESS/2; 13867bd71c6Sperrin 13992241e0bSTom Erickson extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 1404445fffbSMatthew Ahrens nvlist_t *, nvlist_t *); 141681d9761SEric Taylor static int zvol_remove_zv(zvol_state_t *); 142feb08c6bSbillm static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 143e7cbe64fSgw static int zvol_dumpify(zvol_state_t *zv); 144e7cbe64fSgw static int zvol_dump_fini(zvol_state_t *zv); 145e7cbe64fSgw static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 14667bd71c6Sperrin 147fa9e4066Sahrens static void 148681d9761SEric Taylor zvol_size_changed(uint64_t volsize, major_t maj, minor_t min) 149fa9e4066Sahrens { 150681d9761SEric Taylor dev_t dev = makedevice(maj, min); 151fa9e4066Sahrens 152fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 153681d9761SEric Taylor "Size", volsize) == DDI_SUCCESS); 154fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 155681d9761SEric Taylor "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 156e7cbe64fSgw 157e7cbe64fSgw /* Notify specfs to invalidate the cached size */ 158e7cbe64fSgw spec_size_invalidate(dev, VBLK); 159e7cbe64fSgw spec_size_invalidate(dev, VCHR); 160fa9e4066Sahrens } 161fa9e4066Sahrens 162fa9e4066Sahrens int 163e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 164fa9e4066Sahrens { 165e9dbad6fSeschrock if (volsize == 0) 166fa9e4066Sahrens return (EINVAL); 167fa9e4066Sahrens 168e9dbad6fSeschrock if (volsize % blocksize != 0) 1695c5460e9Seschrock return (EINVAL); 1705c5460e9Seschrock 171fa9e4066Sahrens #ifdef _ILP32 172e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 173fa9e4066Sahrens return (EOVERFLOW); 174fa9e4066Sahrens #endif 175fa9e4066Sahrens return (0); 176fa9e4066Sahrens } 177fa9e4066Sahrens 178fa9e4066Sahrens int 179e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 180fa9e4066Sahrens { 181e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 182e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 183e9dbad6fSeschrock !ISP2(volblocksize)) 184fa9e4066Sahrens return (EDOM); 185fa9e4066Sahrens 186fa9e4066Sahrens return (0); 187fa9e4066Sahrens } 188fa9e4066Sahrens 189fa9e4066Sahrens int 190a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 191fa9e4066Sahrens { 192fa9e4066Sahrens int error; 193fa9e4066Sahrens dmu_object_info_t doi; 194a2eea2e1Sahrens uint64_t val; 195fa9e4066Sahrens 196a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 197fa9e4066Sahrens if (error) 198fa9e4066Sahrens return (error); 199fa9e4066Sahrens 200a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 201a2eea2e1Sahrens 202fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 203fa9e4066Sahrens 204a2eea2e1Sahrens if (error == 0) { 205a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 206a2eea2e1Sahrens doi.doi_data_block_size); 207a2eea2e1Sahrens } 208fa9e4066Sahrens 209fa9e4066Sahrens return (error); 210fa9e4066Sahrens } 211fa9e4066Sahrens 212fa9e4066Sahrens static zvol_state_t * 213e9dbad6fSeschrock zvol_minor_lookup(const char *name) 214fa9e4066Sahrens { 215fa9e4066Sahrens minor_t minor; 216fa9e4066Sahrens zvol_state_t *zv; 217fa9e4066Sahrens 218c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 219fa9e4066Sahrens 220c99e4bdcSChris Kirby for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 221c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 222fa9e4066Sahrens if (zv == NULL) 223fa9e4066Sahrens continue; 224fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 225f80ce222SChris Kirby return (zv); 226fa9e4066Sahrens } 227fa9e4066Sahrens 228f80ce222SChris Kirby return (NULL); 229fa9e4066Sahrens } 230fa9e4066Sahrens 231e7cbe64fSgw /* extent mapping arg */ 232e7cbe64fSgw struct maparg { 23388b7b0f2SMatthew Ahrens zvol_state_t *ma_zv; 23488b7b0f2SMatthew Ahrens uint64_t ma_blks; 235e7cbe64fSgw }; 236e7cbe64fSgw 237e7cbe64fSgw /*ARGSUSED*/ 238e7cbe64fSgw static int 239*1b912ec7SGeorge Wilson zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 240b24ab676SJeff Bonwick const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) 241e7cbe64fSgw { 24288b7b0f2SMatthew Ahrens struct maparg *ma = arg; 24388b7b0f2SMatthew Ahrens zvol_extent_t *ze; 24488b7b0f2SMatthew Ahrens int bs = ma->ma_zv->zv_volblocksize; 245e7cbe64fSgw 24688b7b0f2SMatthew Ahrens if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 24788b7b0f2SMatthew Ahrens return (0); 248e7cbe64fSgw 24988b7b0f2SMatthew Ahrens VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 25088b7b0f2SMatthew Ahrens ma->ma_blks++; 251e7cbe64fSgw 25288b7b0f2SMatthew Ahrens /* Abort immediately if we have encountered gang blocks */ 25388b7b0f2SMatthew Ahrens if (BP_IS_GANG(bp)) 25488b7b0f2SMatthew Ahrens return (EFRAGS); 255e7cbe64fSgw 25688b7b0f2SMatthew Ahrens /* 25788b7b0f2SMatthew Ahrens * See if the block is at the end of the previous extent. 25888b7b0f2SMatthew Ahrens */ 25988b7b0f2SMatthew Ahrens ze = list_tail(&ma->ma_zv->zv_extents); 26088b7b0f2SMatthew Ahrens if (ze && 26188b7b0f2SMatthew Ahrens DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 26288b7b0f2SMatthew Ahrens DVA_GET_OFFSET(BP_IDENTITY(bp)) == 26388b7b0f2SMatthew Ahrens DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 26488b7b0f2SMatthew Ahrens ze->ze_nblks++; 26588b7b0f2SMatthew Ahrens return (0); 266e7cbe64fSgw } 267e7cbe64fSgw 26888b7b0f2SMatthew Ahrens dprintf_bp(bp, "%s", "next blkptr:"); 269e7cbe64fSgw 27088b7b0f2SMatthew Ahrens /* start a new extent */ 27188b7b0f2SMatthew Ahrens ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 27288b7b0f2SMatthew Ahrens ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 27388b7b0f2SMatthew Ahrens ze->ze_nblks = 1; 27488b7b0f2SMatthew Ahrens list_insert_tail(&ma->ma_zv->zv_extents, ze); 27588b7b0f2SMatthew Ahrens return (0); 27688b7b0f2SMatthew Ahrens } 277e7cbe64fSgw 27888b7b0f2SMatthew Ahrens static void 27988b7b0f2SMatthew Ahrens zvol_free_extents(zvol_state_t *zv) 28088b7b0f2SMatthew Ahrens { 28188b7b0f2SMatthew Ahrens zvol_extent_t *ze; 282e7cbe64fSgw 28388b7b0f2SMatthew Ahrens while (ze = list_head(&zv->zv_extents)) { 28488b7b0f2SMatthew Ahrens list_remove(&zv->zv_extents, ze); 28588b7b0f2SMatthew Ahrens kmem_free(ze, sizeof (zvol_extent_t)); 286e7cbe64fSgw } 28788b7b0f2SMatthew Ahrens } 288e7cbe64fSgw 28988b7b0f2SMatthew Ahrens static int 29088b7b0f2SMatthew Ahrens zvol_get_lbas(zvol_state_t *zv) 29188b7b0f2SMatthew Ahrens { 2923adc9019SEric Taylor objset_t *os = zv->zv_objset; 29388b7b0f2SMatthew Ahrens struct maparg ma; 29488b7b0f2SMatthew Ahrens int err; 29588b7b0f2SMatthew Ahrens 29688b7b0f2SMatthew Ahrens ma.ma_zv = zv; 29788b7b0f2SMatthew Ahrens ma.ma_blks = 0; 29888b7b0f2SMatthew Ahrens zvol_free_extents(zv); 29988b7b0f2SMatthew Ahrens 3003adc9019SEric Taylor /* commit any in-flight changes before traversing the dataset */ 3013adc9019SEric Taylor txg_wait_synced(dmu_objset_pool(os), 0); 3023adc9019SEric Taylor err = traverse_dataset(dmu_objset_ds(os), 0, 30388b7b0f2SMatthew Ahrens TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 30488b7b0f2SMatthew Ahrens if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 30588b7b0f2SMatthew Ahrens zvol_free_extents(zv); 30688b7b0f2SMatthew Ahrens return (err ? err : EIO); 307e7cbe64fSgw } 30888b7b0f2SMatthew Ahrens 309e7cbe64fSgw return (0); 310e7cbe64fSgw } 311e7cbe64fSgw 312ecd6cf80Smarks /* ARGSUSED */ 313fa9e4066Sahrens void 314ecd6cf80Smarks zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 315fa9e4066Sahrens { 316da6c28aaSamw zfs_creat_t *zct = arg; 317da6c28aaSamw nvlist_t *nvprops = zct->zct_props; 318fa9e4066Sahrens int error; 319e9dbad6fSeschrock uint64_t volblocksize, volsize; 320fa9e4066Sahrens 321ecd6cf80Smarks VERIFY(nvlist_lookup_uint64(nvprops, 322e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 323ecd6cf80Smarks if (nvlist_lookup_uint64(nvprops, 324e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 325e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 326e9dbad6fSeschrock 327e9dbad6fSeschrock /* 328e7cbe64fSgw * These properties must be removed from the list so the generic 329e9dbad6fSeschrock * property setting step won't apply to them. 330e9dbad6fSeschrock */ 331ecd6cf80Smarks VERIFY(nvlist_remove_all(nvprops, 332e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 333ecd6cf80Smarks (void) nvlist_remove_all(nvprops, 334e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 335e9dbad6fSeschrock 336e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 337fa9e4066Sahrens DMU_OT_NONE, 0, tx); 338fa9e4066Sahrens ASSERT(error == 0); 339fa9e4066Sahrens 340fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 341fa9e4066Sahrens DMU_OT_NONE, 0, tx); 342fa9e4066Sahrens ASSERT(error == 0); 343fa9e4066Sahrens 344e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 345fa9e4066Sahrens ASSERT(error == 0); 346fa9e4066Sahrens } 347fa9e4066Sahrens 348b77b9231SDan McDonald /* 349b77b9231SDan McDonald * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 350b77b9231SDan McDonald * implement DKIOCFREE/free-long-range. 351b77b9231SDan McDonald */ 352b77b9231SDan McDonald static int 353b77b9231SDan McDonald zvol_replay_truncate(zvol_state_t *zv, lr_truncate_t *lr, boolean_t byteswap) 354b77b9231SDan McDonald { 355b77b9231SDan McDonald uint64_t offset, length; 356b77b9231SDan McDonald 357b77b9231SDan McDonald if (byteswap) 358b77b9231SDan McDonald byteswap_uint64_array(lr, sizeof (*lr)); 359b77b9231SDan McDonald 360b77b9231SDan McDonald offset = lr->lr_offset; 361b77b9231SDan McDonald length = lr->lr_length; 362b77b9231SDan McDonald 363b77b9231SDan McDonald return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 364b77b9231SDan McDonald } 365b77b9231SDan McDonald 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 */ 375b24ab676SJeff Bonwick uint64_t offset, length; 37622ac5be4Sperrin dmu_tx_t *tx; 37722ac5be4Sperrin int error; 37822ac5be4Sperrin 37922ac5be4Sperrin if (byteswap) 38022ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 38122ac5be4Sperrin 382b24ab676SJeff Bonwick offset = lr->lr_offset; 383b24ab676SJeff Bonwick length = lr->lr_length; 384b24ab676SJeff Bonwick 385b24ab676SJeff Bonwick /* If it's a dmu_sync() block, write the whole block */ 386b24ab676SJeff Bonwick if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 387b24ab676SJeff Bonwick uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 388b24ab676SJeff Bonwick if (length < blocksize) { 389b24ab676SJeff Bonwick offset -= offset % blocksize; 390b24ab676SJeff Bonwick length = blocksize; 391b24ab676SJeff Bonwick } 392b24ab676SJeff Bonwick } 393975c32a0SNeil Perrin 39422ac5be4Sperrin tx = dmu_tx_create(os); 395b24ab676SJeff Bonwick dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 3961209a471SNeil Perrin error = dmu_tx_assign(tx, TXG_WAIT); 39722ac5be4Sperrin if (error) { 39822ac5be4Sperrin dmu_tx_abort(tx); 39922ac5be4Sperrin } else { 400b24ab676SJeff Bonwick dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 40122ac5be4Sperrin dmu_tx_commit(tx); 40222ac5be4Sperrin } 40322ac5be4Sperrin 40422ac5be4Sperrin return (error); 40522ac5be4Sperrin } 40622ac5be4Sperrin 40722ac5be4Sperrin /* ARGSUSED */ 40822ac5be4Sperrin static int 40922ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 41022ac5be4Sperrin { 41122ac5be4Sperrin return (ENOTSUP); 41222ac5be4Sperrin } 41322ac5be4Sperrin 41422ac5be4Sperrin /* 41522ac5be4Sperrin * Callback vectors for replaying records. 416b77b9231SDan McDonald * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 41722ac5be4Sperrin */ 41822ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 41922ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 42022ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 42122ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 42222ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 42322ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 42422ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 42522ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 42622ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 42722ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 42822ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 429b77b9231SDan McDonald zvol_replay_truncate, /* TX_TRUNCATE */ 43022ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 43122ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 432975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL */ 433975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ATTR */ 434975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 435975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL */ 436975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ATTR */ 437975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 438975c32a0SNeil Perrin zvol_replay_err, /* TX_WRITE2 */ 43922ac5be4Sperrin }; 44022ac5be4Sperrin 441681d9761SEric Taylor int 442681d9761SEric Taylor zvol_name2minor(const char *name, minor_t *minor) 443681d9761SEric Taylor { 444681d9761SEric Taylor zvol_state_t *zv; 445681d9761SEric Taylor 446c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 447681d9761SEric Taylor zv = zvol_minor_lookup(name); 448681d9761SEric Taylor if (minor && zv) 449681d9761SEric Taylor *minor = zv->zv_minor; 450c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 451681d9761SEric Taylor return (zv ? 0 : -1); 452681d9761SEric Taylor } 453681d9761SEric Taylor 454e7cbe64fSgw /* 455e7cbe64fSgw * Create a minor node (plus a whole lot more) for the specified volume. 456fa9e4066Sahrens */ 457fa9e4066Sahrens int 458681d9761SEric Taylor zvol_create_minor(const char *name) 459fa9e4066Sahrens { 460c99e4bdcSChris Kirby zfs_soft_state_t *zs; 461fa9e4066Sahrens zvol_state_t *zv; 462fa9e4066Sahrens objset_t *os; 46367bd71c6Sperrin dmu_object_info_t doi; 464fa9e4066Sahrens minor_t minor = 0; 465fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 466fa9e4066Sahrens int error; 467fa9e4066Sahrens 468c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 469fa9e4066Sahrens 4701195e687SMark J Musante if (zvol_minor_lookup(name) != NULL) { 471c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 472fa9e4066Sahrens return (EEXIST); 473fa9e4066Sahrens } 474fa9e4066Sahrens 475503ad85cSMatthew Ahrens /* lie and say we're read-only */ 4766e0cbcaaSMatthew Ahrens error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, FTAG, &os); 477fa9e4066Sahrens 478fa9e4066Sahrens if (error) { 479c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 480fa9e4066Sahrens return (error); 481fa9e4066Sahrens } 482fa9e4066Sahrens 483c99e4bdcSChris Kirby if ((minor = zfsdev_minor_alloc()) == 0) { 4846e0cbcaaSMatthew Ahrens dmu_objset_disown(os, FTAG); 485c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 486fa9e4066Sahrens return (ENXIO); 487fa9e4066Sahrens } 488fa9e4066Sahrens 489c99e4bdcSChris Kirby if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 4906e0cbcaaSMatthew Ahrens dmu_objset_disown(os, FTAG); 491c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 492fa9e4066Sahrens return (EAGAIN); 493fa9e4066Sahrens } 494e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 495e9dbad6fSeschrock (char *)name); 496fa9e4066Sahrens 497681d9761SEric Taylor (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 498fa9e4066Sahrens 499fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 500fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 501c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 5026e0cbcaaSMatthew Ahrens dmu_objset_disown(os, FTAG); 503c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 504fa9e4066Sahrens return (EAGAIN); 505fa9e4066Sahrens } 506fa9e4066Sahrens 507681d9761SEric Taylor (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 508fa9e4066Sahrens 509fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 510fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 511fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 512c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 5136e0cbcaaSMatthew Ahrens dmu_objset_disown(os, FTAG); 514c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 515fa9e4066Sahrens return (EAGAIN); 516fa9e4066Sahrens } 517fa9e4066Sahrens 518c99e4bdcSChris Kirby zs = ddi_get_soft_state(zfsdev_state, minor); 519c99e4bdcSChris Kirby zs->zss_type = ZSST_ZVOL; 520c99e4bdcSChris Kirby zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 521681d9761SEric Taylor (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 522fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 523fa9e4066Sahrens zv->zv_minor = minor; 524fa9e4066Sahrens zv->zv_objset = os; 525f9af39baSGeorge Wilson if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 526681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 527c2e6a7d6Sperrin mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 528c2e6a7d6Sperrin avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 529c2e6a7d6Sperrin sizeof (rl_t), offsetof(rl_t, r_node)); 53088b7b0f2SMatthew Ahrens list_create(&zv->zv_extents, sizeof (zvol_extent_t), 53188b7b0f2SMatthew Ahrens offsetof(zvol_extent_t, ze_node)); 53267bd71c6Sperrin /* get and cache the blocksize */ 53367bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 53467bd71c6Sperrin ASSERT(error == 0); 53567bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 53622ac5be4Sperrin 537f9af39baSGeorge Wilson if (spa_writeable(dmu_objset_spa(os))) { 538f9af39baSGeorge Wilson if (zil_replay_disable) 539f9af39baSGeorge Wilson zil_destroy(dmu_objset_zil(os), B_FALSE); 540f9af39baSGeorge Wilson else 541f9af39baSGeorge Wilson zil_replay(os, zv, zvol_replay_vector); 542f9af39baSGeorge Wilson } 5436e0cbcaaSMatthew Ahrens dmu_objset_disown(os, FTAG); 544681d9761SEric Taylor zv->zv_objset = NULL; 545fa9e4066Sahrens 546fa9e4066Sahrens zvol_minors++; 547fa9e4066Sahrens 548c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 549fa9e4066Sahrens 550fa9e4066Sahrens return (0); 551fa9e4066Sahrens } 552fa9e4066Sahrens 553fa9e4066Sahrens /* 554fa9e4066Sahrens * Remove minor node for the specified volume. 555fa9e4066Sahrens */ 556681d9761SEric Taylor static int 557681d9761SEric Taylor zvol_remove_zv(zvol_state_t *zv) 558681d9761SEric Taylor { 559681d9761SEric Taylor char nmbuf[20]; 560c99e4bdcSChris Kirby minor_t minor = zv->zv_minor; 561681d9761SEric Taylor 562c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 563681d9761SEric Taylor if (zv->zv_total_opens != 0) 564681d9761SEric Taylor return (EBUSY); 565681d9761SEric Taylor 566c99e4bdcSChris Kirby (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 567681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 568681d9761SEric Taylor 569c99e4bdcSChris Kirby (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 570681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 571681d9761SEric Taylor 572681d9761SEric Taylor avl_destroy(&zv->zv_znode.z_range_avl); 573681d9761SEric Taylor mutex_destroy(&zv->zv_znode.z_range_lock); 574681d9761SEric Taylor 575c99e4bdcSChris Kirby kmem_free(zv, sizeof (zvol_state_t)); 576c99e4bdcSChris Kirby 577c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 578681d9761SEric Taylor 579681d9761SEric Taylor zvol_minors--; 580681d9761SEric Taylor return (0); 581681d9761SEric Taylor } 582681d9761SEric Taylor 583fa9e4066Sahrens int 584e9dbad6fSeschrock zvol_remove_minor(const char *name) 585fa9e4066Sahrens { 586fa9e4066Sahrens zvol_state_t *zv; 587681d9761SEric Taylor int rc; 588fa9e4066Sahrens 589c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 590e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 591c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 592fa9e4066Sahrens return (ENXIO); 593fa9e4066Sahrens } 594681d9761SEric Taylor rc = zvol_remove_zv(zv); 595c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 596681d9761SEric Taylor return (rc); 597681d9761SEric Taylor } 598fa9e4066Sahrens 599681d9761SEric Taylor int 600681d9761SEric Taylor zvol_first_open(zvol_state_t *zv) 601681d9761SEric Taylor { 602681d9761SEric Taylor objset_t *os; 603681d9761SEric Taylor uint64_t volsize; 604681d9761SEric Taylor int error; 605681d9761SEric Taylor uint64_t readonly; 606fa9e4066Sahrens 607681d9761SEric Taylor /* lie and say we're read-only */ 608681d9761SEric Taylor error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 609681d9761SEric Taylor zvol_tag, &os); 610681d9761SEric Taylor if (error) 611681d9761SEric Taylor return (error); 612fa9e4066Sahrens 613681d9761SEric Taylor error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 614681d9761SEric Taylor if (error) { 615681d9761SEric Taylor ASSERT(error == 0); 616681d9761SEric Taylor dmu_objset_disown(os, zvol_tag); 617681d9761SEric Taylor return (error); 618681d9761SEric Taylor } 619681d9761SEric Taylor zv->zv_objset = os; 62094d1a210STim Haley error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf); 62194d1a210STim Haley if (error) { 62294d1a210STim Haley dmu_objset_disown(os, zvol_tag); 62394d1a210STim Haley return (error); 62494d1a210STim Haley } 625681d9761SEric Taylor zv->zv_volsize = volsize; 626681d9761SEric Taylor zv->zv_zilog = zil_open(os, zvol_get_data); 627681d9761SEric Taylor zvol_size_changed(zv->zv_volsize, ddi_driver_major(zfs_dip), 628681d9761SEric Taylor zv->zv_minor); 629fa9e4066Sahrens 630681d9761SEric Taylor VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 631681d9761SEric Taylor NULL) == 0); 632f9af39baSGeorge Wilson if (readonly || dmu_objset_is_snapshot(os) || 633f9af39baSGeorge Wilson !spa_writeable(dmu_objset_spa(os))) 634681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 635681d9761SEric Taylor else 636681d9761SEric Taylor zv->zv_flags &= ~ZVOL_RDONLY; 637681d9761SEric Taylor return (error); 638681d9761SEric Taylor } 639fa9e4066Sahrens 640681d9761SEric Taylor void 641681d9761SEric Taylor zvol_last_close(zvol_state_t *zv) 642681d9761SEric Taylor { 64322ac5be4Sperrin zil_close(zv->zv_zilog); 64422ac5be4Sperrin zv->zv_zilog = NULL; 6452e2c1355SMatthew Ahrens 64694d1a210STim Haley dmu_buf_rele(zv->zv_dbuf, zvol_tag); 64794d1a210STim Haley zv->zv_dbuf = NULL; 6482e2c1355SMatthew Ahrens 6492e2c1355SMatthew Ahrens /* 6502e2c1355SMatthew Ahrens * Evict cached data 6512e2c1355SMatthew Ahrens */ 6522e2c1355SMatthew Ahrens if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && 6532e2c1355SMatthew Ahrens !(zv->zv_flags & ZVOL_RDONLY)) 6542e2c1355SMatthew Ahrens txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 6552e2c1355SMatthew Ahrens (void) dmu_objset_evict_dbufs(zv->zv_objset); 6562e2c1355SMatthew Ahrens 657503ad85cSMatthew Ahrens dmu_objset_disown(zv->zv_objset, zvol_tag); 658fa9e4066Sahrens zv->zv_objset = NULL; 659fa9e4066Sahrens } 660fa9e4066Sahrens 661e7cbe64fSgw int 662e7cbe64fSgw zvol_prealloc(zvol_state_t *zv) 663e7cbe64fSgw { 664e7cbe64fSgw objset_t *os = zv->zv_objset; 665e7cbe64fSgw dmu_tx_t *tx; 666e7cbe64fSgw uint64_t refd, avail, usedobjs, availobjs; 667e7cbe64fSgw uint64_t resid = zv->zv_volsize; 668e7cbe64fSgw uint64_t off = 0; 669e7cbe64fSgw 670e7cbe64fSgw /* Check the space usage before attempting to allocate the space */ 671e7cbe64fSgw dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 672e7cbe64fSgw if (avail < zv->zv_volsize) 673e7cbe64fSgw return (ENOSPC); 674e7cbe64fSgw 675e7cbe64fSgw /* Free old extents if they exist */ 676e7cbe64fSgw zvol_free_extents(zv); 677e7cbe64fSgw 678e7cbe64fSgw while (resid != 0) { 679e7cbe64fSgw int error; 680e7cbe64fSgw uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); 681e7cbe64fSgw 682e7cbe64fSgw tx = dmu_tx_create(os); 683e7cbe64fSgw dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 684e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 685e7cbe64fSgw if (error) { 686e7cbe64fSgw dmu_tx_abort(tx); 687cdb0ab79Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 688e7cbe64fSgw return (error); 689e7cbe64fSgw } 69082c9918fSTim Haley dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 691e7cbe64fSgw dmu_tx_commit(tx); 692e7cbe64fSgw off += bytes; 693e7cbe64fSgw resid -= bytes; 694e7cbe64fSgw } 695e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 696e7cbe64fSgw 697e7cbe64fSgw return (0); 698e7cbe64fSgw } 699e7cbe64fSgw 700e7cbe64fSgw int 701681d9761SEric Taylor zvol_update_volsize(objset_t *os, uint64_t volsize) 702e7cbe64fSgw { 703e7cbe64fSgw dmu_tx_t *tx; 704e7cbe64fSgw int error; 705e7cbe64fSgw 706c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 707e7cbe64fSgw 708681d9761SEric Taylor tx = dmu_tx_create(os); 709e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 710e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 711e7cbe64fSgw if (error) { 712e7cbe64fSgw dmu_tx_abort(tx); 713e7cbe64fSgw return (error); 714e7cbe64fSgw } 715e7cbe64fSgw 716681d9761SEric Taylor error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 717e7cbe64fSgw &volsize, tx); 718e7cbe64fSgw dmu_tx_commit(tx); 719e7cbe64fSgw 720e7cbe64fSgw if (error == 0) 721681d9761SEric Taylor error = dmu_free_long_range(os, 722cdb0ab79Smaybee ZVOL_OBJ, volsize, DMU_OBJECT_END); 723681d9761SEric Taylor return (error); 724681d9761SEric Taylor } 725e7cbe64fSgw 726681d9761SEric Taylor void 727681d9761SEric Taylor zvol_remove_minors(const char *name) 728681d9761SEric Taylor { 729681d9761SEric Taylor zvol_state_t *zv; 730681d9761SEric Taylor char *namebuf; 731681d9761SEric Taylor minor_t minor; 732681d9761SEric Taylor 733681d9761SEric Taylor namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 734681d9761SEric Taylor (void) strncpy(namebuf, name, strlen(name)); 735681d9761SEric Taylor (void) strcat(namebuf, "/"); 736c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 737c99e4bdcSChris Kirby for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 738681d9761SEric Taylor 739c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 740681d9761SEric Taylor if (zv == NULL) 741681d9761SEric Taylor continue; 742681d9761SEric Taylor if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 743681d9761SEric Taylor (void) zvol_remove_zv(zv); 744e7cbe64fSgw } 745681d9761SEric Taylor kmem_free(namebuf, strlen(name) + 2); 746681d9761SEric Taylor 747c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 748e7cbe64fSgw } 749e7cbe64fSgw 750fa9e4066Sahrens int 75191ebeef5Sahrens zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 752fa9e4066Sahrens { 753681d9761SEric Taylor zvol_state_t *zv = NULL; 754681d9761SEric Taylor objset_t *os; 755fa9e4066Sahrens int error; 7565c5460e9Seschrock dmu_object_info_t doi; 757e7cbe64fSgw uint64_t old_volsize = 0ULL; 758681d9761SEric Taylor uint64_t readonly; 759fa9e4066Sahrens 760c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 761681d9761SEric Taylor zv = zvol_minor_lookup(name); 762681d9761SEric Taylor if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 763c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 764681d9761SEric Taylor return (error); 765fa9e4066Sahrens } 766fa9e4066Sahrens 767681d9761SEric Taylor if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 768e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 769bb0ade09Sahrens doi.doi_data_block_size)) != 0) 770bb0ade09Sahrens goto out; 7715c5460e9Seschrock 772681d9761SEric Taylor VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, 773681d9761SEric Taylor NULL) == 0); 774681d9761SEric Taylor if (readonly) { 775bb0ade09Sahrens error = EROFS; 776bb0ade09Sahrens goto out; 777fa9e4066Sahrens } 778fa9e4066Sahrens 779681d9761SEric Taylor error = zvol_update_volsize(os, volsize); 780e7cbe64fSgw /* 781e7cbe64fSgw * Reinitialize the dump area to the new size. If we 782681d9761SEric Taylor * failed to resize the dump area then restore it back to 783681d9761SEric Taylor * its original size. 784e7cbe64fSgw */ 785681d9761SEric Taylor if (zv && error == 0) { 786681d9761SEric Taylor if (zv->zv_flags & ZVOL_DUMPIFIED) { 787681d9761SEric Taylor old_volsize = zv->zv_volsize; 788681d9761SEric Taylor zv->zv_volsize = volsize; 789681d9761SEric Taylor if ((error = zvol_dumpify(zv)) != 0 || 790681d9761SEric Taylor (error = dumpvp_resize()) != 0) { 791681d9761SEric Taylor (void) zvol_update_volsize(os, old_volsize); 792681d9761SEric Taylor zv->zv_volsize = old_volsize; 793681d9761SEric Taylor error = zvol_dumpify(zv); 794681d9761SEric Taylor } 795681d9761SEric Taylor } 796681d9761SEric Taylor if (error == 0) { 797681d9761SEric Taylor zv->zv_volsize = volsize; 798681d9761SEric Taylor zvol_size_changed(volsize, maj, zv->zv_minor); 799e7cbe64fSgw } 800fa9e4066Sahrens } 801fa9e4066Sahrens 802573ca77eSGeorge Wilson /* 803573ca77eSGeorge Wilson * Generate a LUN expansion event. 804573ca77eSGeorge Wilson */ 805681d9761SEric Taylor if (zv && error == 0) { 806573ca77eSGeorge Wilson sysevent_id_t eid; 807573ca77eSGeorge Wilson nvlist_t *attr; 808573ca77eSGeorge Wilson char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 809573ca77eSGeorge Wilson 810681d9761SEric Taylor (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 811573ca77eSGeorge Wilson zv->zv_minor); 812573ca77eSGeorge Wilson 813573ca77eSGeorge Wilson VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 814573ca77eSGeorge Wilson VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 815573ca77eSGeorge Wilson 816573ca77eSGeorge Wilson (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 817573ca77eSGeorge Wilson ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 818573ca77eSGeorge Wilson 819573ca77eSGeorge Wilson nvlist_free(attr); 820573ca77eSGeorge Wilson kmem_free(physpath, MAXPATHLEN); 821573ca77eSGeorge Wilson } 822573ca77eSGeorge Wilson 823bb0ade09Sahrens out: 824681d9761SEric Taylor dmu_objset_rele(os, FTAG); 825bb0ade09Sahrens 826c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 827fa9e4066Sahrens 828fa9e4066Sahrens return (error); 829fa9e4066Sahrens } 830fa9e4066Sahrens 831fa9e4066Sahrens /*ARGSUSED*/ 832fa9e4066Sahrens int 833fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 834fa9e4066Sahrens { 835fa9e4066Sahrens zvol_state_t *zv; 836681d9761SEric Taylor int err = 0; 837fa9e4066Sahrens 838c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 839fa9e4066Sahrens 840c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 841fa9e4066Sahrens if (zv == NULL) { 842c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 843fa9e4066Sahrens return (ENXIO); 844fa9e4066Sahrens } 845fa9e4066Sahrens 846681d9761SEric Taylor if (zv->zv_total_opens == 0) 847681d9761SEric Taylor err = zvol_first_open(zv); 848681d9761SEric Taylor if (err) { 849c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 850681d9761SEric Taylor return (err); 851681d9761SEric Taylor } 852681d9761SEric Taylor if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 853681d9761SEric Taylor err = EROFS; 854681d9761SEric Taylor goto out; 855fa9e4066Sahrens } 856c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 857681d9761SEric Taylor err = EBUSY; 858681d9761SEric Taylor goto out; 859c7f714e2SEric Taylor } 860c7f714e2SEric Taylor if (flag & FEXCL) { 861c7f714e2SEric Taylor if (zv->zv_total_opens != 0) { 862681d9761SEric Taylor err = EBUSY; 863681d9761SEric Taylor goto out; 864c7f714e2SEric Taylor } 865c7f714e2SEric Taylor zv->zv_flags |= ZVOL_EXCL; 866c7f714e2SEric Taylor } 867fa9e4066Sahrens 868fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 869fa9e4066Sahrens zv->zv_open_count[otyp]++; 870fa9e4066Sahrens zv->zv_total_opens++; 871fa9e4066Sahrens } 872c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 873fa9e4066Sahrens 874681d9761SEric Taylor return (err); 875681d9761SEric Taylor out: 876681d9761SEric Taylor if (zv->zv_total_opens == 0) 877681d9761SEric Taylor zvol_last_close(zv); 878c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 879681d9761SEric Taylor return (err); 880fa9e4066Sahrens } 881fa9e4066Sahrens 882fa9e4066Sahrens /*ARGSUSED*/ 883fa9e4066Sahrens int 884fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 885fa9e4066Sahrens { 886fa9e4066Sahrens minor_t minor = getminor(dev); 887fa9e4066Sahrens zvol_state_t *zv; 888681d9761SEric Taylor int error = 0; 889fa9e4066Sahrens 890c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 891fa9e4066Sahrens 892c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 893fa9e4066Sahrens if (zv == NULL) { 894c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 895fa9e4066Sahrens return (ENXIO); 896fa9e4066Sahrens } 897fa9e4066Sahrens 898c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 899c7f714e2SEric Taylor ASSERT(zv->zv_total_opens == 1); 900c7f714e2SEric Taylor zv->zv_flags &= ~ZVOL_EXCL; 901fa9e4066Sahrens } 902fa9e4066Sahrens 903fa9e4066Sahrens /* 904fa9e4066Sahrens * If the open count is zero, this is a spurious close. 905fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 906fa9e4066Sahrens */ 907fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 908fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 909fa9e4066Sahrens 910fa9e4066Sahrens /* 911fa9e4066Sahrens * You may get multiple opens, but only one close. 912fa9e4066Sahrens */ 913fa9e4066Sahrens zv->zv_open_count[otyp]--; 914fa9e4066Sahrens zv->zv_total_opens--; 915fa9e4066Sahrens 916681d9761SEric Taylor if (zv->zv_total_opens == 0) 917681d9761SEric Taylor zvol_last_close(zv); 918fa9e4066Sahrens 919c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 920681d9761SEric Taylor return (error); 921fa9e4066Sahrens } 922fa9e4066Sahrens 923feb08c6bSbillm static void 924b24ab676SJeff Bonwick zvol_get_done(zgd_t *zgd, int error) 92567bd71c6Sperrin { 926b24ab676SJeff Bonwick if (zgd->zgd_db) 927b24ab676SJeff Bonwick dmu_buf_rele(zgd->zgd_db, zgd); 928b24ab676SJeff Bonwick 929b24ab676SJeff Bonwick zfs_range_unlock(zgd->zgd_rl); 930b24ab676SJeff Bonwick 931b24ab676SJeff Bonwick if (error == 0 && zgd->zgd_bp) 932b24ab676SJeff Bonwick zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 93367bd71c6Sperrin 93467bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 93567bd71c6Sperrin } 93667bd71c6Sperrin 93767bd71c6Sperrin /* 93867bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 93967bd71c6Sperrin */ 940feb08c6bSbillm static int 94167bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 94267bd71c6Sperrin { 94367bd71c6Sperrin zvol_state_t *zv = arg; 94467bd71c6Sperrin objset_t *os = zv->zv_objset; 945b24ab676SJeff Bonwick uint64_t object = ZVOL_OBJ; 946b24ab676SJeff Bonwick uint64_t offset = lr->lr_offset; 947b24ab676SJeff Bonwick uint64_t size = lr->lr_length; /* length of user data */ 948b24ab676SJeff Bonwick blkptr_t *bp = &lr->lr_blkptr; 94967bd71c6Sperrin dmu_buf_t *db; 95067bd71c6Sperrin zgd_t *zgd; 95167bd71c6Sperrin int error; 95267bd71c6Sperrin 953b24ab676SJeff Bonwick ASSERT(zio != NULL); 954b24ab676SJeff Bonwick ASSERT(size != 0); 955b24ab676SJeff Bonwick 956b24ab676SJeff Bonwick zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 957b24ab676SJeff Bonwick zgd->zgd_zilog = zv->zv_zilog; 958b24ab676SJeff Bonwick zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); 959feb08c6bSbillm 960c2e6a7d6Sperrin /* 961c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 962c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 963c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 964c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 965c2e6a7d6Sperrin * we don't have to write the data twice. 966c2e6a7d6Sperrin */ 967b24ab676SJeff Bonwick if (buf != NULL) { /* immediate write */ 968b24ab676SJeff Bonwick error = dmu_read(os, object, offset, size, buf, 969b24ab676SJeff Bonwick DMU_READ_NO_PREFETCH); 970b24ab676SJeff Bonwick } else { 971b24ab676SJeff Bonwick size = zv->zv_volblocksize; 972b24ab676SJeff Bonwick offset = P2ALIGN(offset, size); 97347cb52daSJeff Bonwick error = dmu_buf_hold(os, object, offset, zgd, &db, 97447cb52daSJeff Bonwick DMU_READ_NO_PREFETCH); 975b24ab676SJeff Bonwick if (error == 0) { 97680901aeaSGeorge Wilson blkptr_t *obp = dmu_buf_get_blkptr(db); 97780901aeaSGeorge Wilson if (obp) { 97880901aeaSGeorge Wilson ASSERT(BP_IS_HOLE(bp)); 97980901aeaSGeorge Wilson *bp = *obp; 98080901aeaSGeorge Wilson } 98180901aeaSGeorge Wilson 982b24ab676SJeff Bonwick zgd->zgd_db = db; 983b24ab676SJeff Bonwick zgd->zgd_bp = bp; 98467bd71c6Sperrin 985b24ab676SJeff Bonwick ASSERT(db->db_offset == offset); 986b24ab676SJeff Bonwick ASSERT(db->db_size == size); 98767bd71c6Sperrin 988b24ab676SJeff Bonwick error = dmu_sync(zio, lr->lr_common.lrc_txg, 989b24ab676SJeff Bonwick zvol_get_done, zgd); 990975c32a0SNeil Perrin 991b24ab676SJeff Bonwick if (error == 0) 992b24ab676SJeff Bonwick return (0); 993b24ab676SJeff Bonwick } 994975c32a0SNeil Perrin } 995975c32a0SNeil Perrin 996b24ab676SJeff Bonwick zvol_get_done(zgd, error); 997b24ab676SJeff Bonwick 99867bd71c6Sperrin return (error); 99967bd71c6Sperrin } 100067bd71c6Sperrin 1001a24e15ceSperrin /* 1002a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 100322ac5be4Sperrin * 100422ac5be4Sperrin * We store data in the log buffers if it's small enough. 100567bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 100622ac5be4Sperrin */ 100767bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 100822ac5be4Sperrin 1009feb08c6bSbillm static void 1010510b6c0eSNeil Perrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1011510b6c0eSNeil Perrin boolean_t sync) 101222ac5be4Sperrin { 1013feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 10141209a471SNeil Perrin zilog_t *zilog = zv->zv_zilog; 1015510b6c0eSNeil Perrin boolean_t slogging; 1016e09fa4daSNeil Perrin ssize_t immediate_write_sz; 1017510b6c0eSNeil Perrin 1018b24ab676SJeff Bonwick if (zil_replaying(zilog, tx)) 10191209a471SNeil Perrin return; 10201209a471SNeil Perrin 1021e09fa4daSNeil Perrin immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1022e09fa4daSNeil Perrin ? 0 : zvol_immediate_write_sz; 1023e09fa4daSNeil Perrin 1024e09fa4daSNeil Perrin slogging = spa_has_slogs(zilog->zl_spa) && 1025e09fa4daSNeil Perrin (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); 1026feb08c6bSbillm 1027510b6c0eSNeil Perrin while (resid) { 1028510b6c0eSNeil Perrin itx_t *itx; 1029510b6c0eSNeil Perrin lr_write_t *lr; 1030510b6c0eSNeil Perrin ssize_t len; 1031510b6c0eSNeil Perrin itx_wr_state_t write_state; 1032510b6c0eSNeil Perrin 1033510b6c0eSNeil Perrin /* 1034510b6c0eSNeil Perrin * Unlike zfs_log_write() we can be called with 1035510b6c0eSNeil Perrin * upto DMU_MAX_ACCESS/2 (5MB) writes. 1036510b6c0eSNeil Perrin */ 1037e09fa4daSNeil Perrin if (blocksize > immediate_write_sz && !slogging && 1038510b6c0eSNeil Perrin resid >= blocksize && off % blocksize == 0) { 1039510b6c0eSNeil Perrin write_state = WR_INDIRECT; /* uses dmu_sync */ 1040510b6c0eSNeil Perrin len = blocksize; 1041510b6c0eSNeil Perrin } else if (sync) { 1042510b6c0eSNeil Perrin write_state = WR_COPIED; 1043510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1044510b6c0eSNeil Perrin } else { 1045510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1046510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1047510b6c0eSNeil Perrin } 1048510b6c0eSNeil Perrin 1049510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1050510b6c0eSNeil Perrin (write_state == WR_COPIED ? len : 0)); 1051feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 1052510b6c0eSNeil Perrin if (write_state == WR_COPIED && dmu_read(zv->zv_objset, 10537bfdf011SNeil Perrin ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1054b24ab676SJeff Bonwick zil_itx_destroy(itx); 1055510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1056510b6c0eSNeil Perrin lr = (lr_write_t *)&itx->itx_lr; 1057510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1058510b6c0eSNeil Perrin } 1059510b6c0eSNeil Perrin 1060510b6c0eSNeil Perrin itx->itx_wr_state = write_state; 1061510b6c0eSNeil Perrin if (write_state == WR_NEED_COPY) 1062510b6c0eSNeil Perrin itx->itx_sod += len; 1063feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 1064feb08c6bSbillm lr->lr_offset = off; 1065510b6c0eSNeil Perrin lr->lr_length = len; 1066b24ab676SJeff Bonwick lr->lr_blkoff = 0; 1067feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 1068feb08c6bSbillm 1069510b6c0eSNeil Perrin itx->itx_private = zv; 1070510b6c0eSNeil Perrin itx->itx_sync = sync; 1071510b6c0eSNeil Perrin 10725002558fSNeil Perrin zil_itx_assign(zilog, itx, tx); 1073510b6c0eSNeil Perrin 1074510b6c0eSNeil Perrin off += len; 1075510b6c0eSNeil Perrin resid -= len; 107622ac5be4Sperrin } 107722ac5be4Sperrin } 107822ac5be4Sperrin 107988b7b0f2SMatthew Ahrens static int 108088b7b0f2SMatthew Ahrens zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 108188b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1082e7cbe64fSgw { 1083e7cbe64fSgw vdev_disk_t *dvd; 1084e7cbe64fSgw int c; 1085e7cbe64fSgw int numerrors = 0; 1086e7cbe64fSgw 1087e7cbe64fSgw for (c = 0; c < vd->vdev_children; c++) { 108821ecdf64SLin Ling ASSERT(vd->vdev_ops == &vdev_mirror_ops || 108921ecdf64SLin Ling vd->vdev_ops == &vdev_replacing_ops || 109021ecdf64SLin Ling vd->vdev_ops == &vdev_spare_ops); 109188b7b0f2SMatthew Ahrens int err = zvol_dumpio_vdev(vd->vdev_child[c], 109288b7b0f2SMatthew Ahrens addr, offset, size, doread, isdump); 109388b7b0f2SMatthew Ahrens if (err != 0) { 1094e7cbe64fSgw numerrors++; 109588b7b0f2SMatthew Ahrens } else if (doread) { 1096e7cbe64fSgw break; 1097e7cbe64fSgw } 1098e7cbe64fSgw } 1099e7cbe64fSgw 1100e7cbe64fSgw if (!vd->vdev_ops->vdev_op_leaf) 1101e7cbe64fSgw return (numerrors < vd->vdev_children ? 0 : EIO); 1102e7cbe64fSgw 1103dc0bb255SEric Taylor if (doread && !vdev_readable(vd)) 1104dc0bb255SEric Taylor return (EIO); 1105dc0bb255SEric Taylor else if (!doread && !vdev_writeable(vd)) 1106e7cbe64fSgw return (EIO); 1107e7cbe64fSgw 1108e7cbe64fSgw dvd = vd->vdev_tsd; 1109e7cbe64fSgw ASSERT3P(dvd, !=, NULL); 1110e7cbe64fSgw offset += VDEV_LABEL_START_SIZE; 1111e7cbe64fSgw 1112e7cbe64fSgw if (ddi_in_panic() || isdump) { 111388b7b0f2SMatthew Ahrens ASSERT(!doread); 111488b7b0f2SMatthew Ahrens if (doread) 1115e7cbe64fSgw return (EIO); 1116e7cbe64fSgw return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1117e7cbe64fSgw lbtodb(size))); 1118e7cbe64fSgw } else { 1119e7cbe64fSgw return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 112088b7b0f2SMatthew Ahrens doread ? B_READ : B_WRITE)); 1121e7cbe64fSgw } 1122e7cbe64fSgw } 1123e7cbe64fSgw 112488b7b0f2SMatthew Ahrens static int 112588b7b0f2SMatthew Ahrens zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 112688b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1127e7cbe64fSgw { 1128e7cbe64fSgw vdev_t *vd; 1129e7cbe64fSgw int error; 113088b7b0f2SMatthew Ahrens zvol_extent_t *ze; 1131e7cbe64fSgw spa_t *spa = dmu_objset_spa(zv->zv_objset); 1132e7cbe64fSgw 113388b7b0f2SMatthew Ahrens /* Must be sector aligned, and not stradle a block boundary. */ 113488b7b0f2SMatthew Ahrens if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 113588b7b0f2SMatthew Ahrens P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1136e7cbe64fSgw return (EINVAL); 113788b7b0f2SMatthew Ahrens } 113888b7b0f2SMatthew Ahrens ASSERT(size <= zv->zv_volblocksize); 1139e7cbe64fSgw 114088b7b0f2SMatthew Ahrens /* Locate the extent this belongs to */ 114188b7b0f2SMatthew Ahrens ze = list_head(&zv->zv_extents); 114288b7b0f2SMatthew Ahrens while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 114388b7b0f2SMatthew Ahrens offset -= ze->ze_nblks * zv->zv_volblocksize; 114488b7b0f2SMatthew Ahrens ze = list_next(&zv->zv_extents, ze); 114588b7b0f2SMatthew Ahrens } 114624cc0e1cSGeorge Wilson 114724cc0e1cSGeorge Wilson if (!ddi_in_panic()) 114824cc0e1cSGeorge Wilson spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 114924cc0e1cSGeorge Wilson 115088b7b0f2SMatthew Ahrens vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 115188b7b0f2SMatthew Ahrens offset += DVA_GET_OFFSET(&ze->ze_dva); 115288b7b0f2SMatthew Ahrens error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 115324cc0e1cSGeorge Wilson 115424cc0e1cSGeorge Wilson if (!ddi_in_panic()) 115524cc0e1cSGeorge Wilson spa_config_exit(spa, SCL_STATE, FTAG); 115624cc0e1cSGeorge Wilson 1157e7cbe64fSgw return (error); 1158e7cbe64fSgw } 1159e7cbe64fSgw 1160fa9e4066Sahrens int 1161fa9e4066Sahrens zvol_strategy(buf_t *bp) 1162fa9e4066Sahrens { 1163c99e4bdcSChris Kirby zfs_soft_state_t *zs = NULL; 1164c99e4bdcSChris Kirby zvol_state_t *zv; 1165fa9e4066Sahrens uint64_t off, volsize; 116688b7b0f2SMatthew Ahrens size_t resid; 1167fa9e4066Sahrens char *addr; 116822ac5be4Sperrin objset_t *os; 1169c2e6a7d6Sperrin rl_t *rl; 1170fa9e4066Sahrens int error = 0; 117188b7b0f2SMatthew Ahrens boolean_t doread = bp->b_flags & B_READ; 1172f80ce222SChris Kirby boolean_t is_dump; 1173510b6c0eSNeil Perrin boolean_t sync; 1174fa9e4066Sahrens 1175c99e4bdcSChris Kirby if (getminor(bp->b_edev) == 0) { 1176c99e4bdcSChris Kirby error = EINVAL; 1177c99e4bdcSChris Kirby } else { 1178c99e4bdcSChris Kirby zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1179c99e4bdcSChris Kirby if (zs == NULL) 1180c99e4bdcSChris Kirby error = ENXIO; 1181c99e4bdcSChris Kirby else if (zs->zss_type != ZSST_ZVOL) 1182c99e4bdcSChris Kirby error = EINVAL; 1183fa9e4066Sahrens } 1184fa9e4066Sahrens 1185c99e4bdcSChris Kirby if (error) { 1186c99e4bdcSChris Kirby bioerror(bp, error); 1187fa9e4066Sahrens biodone(bp); 1188fa9e4066Sahrens return (0); 1189fa9e4066Sahrens } 1190fa9e4066Sahrens 1191c99e4bdcSChris Kirby zv = zs->zss_data; 1192c99e4bdcSChris Kirby 1193681d9761SEric Taylor if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1194fa9e4066Sahrens bioerror(bp, EROFS); 1195fa9e4066Sahrens biodone(bp); 1196fa9e4066Sahrens return (0); 1197fa9e4066Sahrens } 1198fa9e4066Sahrens 1199fa9e4066Sahrens off = ldbtob(bp->b_blkno); 1200fa9e4066Sahrens volsize = zv->zv_volsize; 1201fa9e4066Sahrens 120222ac5be4Sperrin os = zv->zv_objset; 120322ac5be4Sperrin ASSERT(os != NULL); 1204fa9e4066Sahrens 1205fa9e4066Sahrens bp_mapin(bp); 1206fa9e4066Sahrens addr = bp->b_un.b_addr; 1207fa9e4066Sahrens resid = bp->b_bcount; 1208fa9e4066Sahrens 120988b7b0f2SMatthew Ahrens if (resid > 0 && (off < 0 || off >= volsize)) { 121088b7b0f2SMatthew Ahrens bioerror(bp, EIO); 121188b7b0f2SMatthew Ahrens biodone(bp); 121288b7b0f2SMatthew Ahrens return (0); 121388b7b0f2SMatthew Ahrens } 121473ec3d9cSgw 1215f80ce222SChris Kirby is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 121655da60b9SMark J Musante sync = ((!(bp->b_flags & B_ASYNC) && 121755da60b9SMark J Musante !(zv->zv_flags & ZVOL_WCE)) || 121855da60b9SMark J Musante (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 121955da60b9SMark J Musante !doread && !is_dump; 1220510b6c0eSNeil Perrin 1221a24e15ceSperrin /* 1222a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 1223a24e15ceSperrin * we can't change the data whilst calculating the checksum. 1224a24e15ceSperrin */ 1225c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 122688b7b0f2SMatthew Ahrens doread ? RL_READER : RL_WRITER); 1227fa9e4066Sahrens 1228e7cbe64fSgw while (resid != 0 && off < volsize) { 122988b7b0f2SMatthew Ahrens size_t size = MIN(resid, zvol_maxphys); 1230e7cbe64fSgw if (is_dump) { 1231e7cbe64fSgw size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 123288b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, off, size, 123388b7b0f2SMatthew Ahrens doread, B_FALSE); 123488b7b0f2SMatthew Ahrens } else if (doread) { 12357bfdf011SNeil Perrin error = dmu_read(os, ZVOL_OBJ, off, size, addr, 12367bfdf011SNeil Perrin DMU_READ_PREFETCH); 1237fa9e4066Sahrens } else { 123822ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 1239fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1240fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 1241fa9e4066Sahrens if (error) { 1242fa9e4066Sahrens dmu_tx_abort(tx); 1243fa9e4066Sahrens } else { 124422ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1245510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, size, sync); 1246fa9e4066Sahrens dmu_tx_commit(tx); 1247fa9e4066Sahrens } 1248fa9e4066Sahrens } 1249b87f3af3Sperrin if (error) { 1250b87f3af3Sperrin /* convert checksum errors into IO errors */ 1251b87f3af3Sperrin if (error == ECKSUM) 1252b87f3af3Sperrin error = EIO; 1253fa9e4066Sahrens break; 1254b87f3af3Sperrin } 1255fa9e4066Sahrens off += size; 1256fa9e4066Sahrens addr += size; 1257fa9e4066Sahrens resid -= size; 1258fa9e4066Sahrens } 1259c2e6a7d6Sperrin zfs_range_unlock(rl); 1260fa9e4066Sahrens 1261fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 1262fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 1263fa9e4066Sahrens 1264510b6c0eSNeil Perrin if (sync) 12655002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1266feb08c6bSbillm biodone(bp); 126722ac5be4Sperrin 1268fa9e4066Sahrens return (0); 1269fa9e4066Sahrens } 1270fa9e4066Sahrens 127167bd71c6Sperrin /* 127267bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 127367bd71c6Sperrin * Using our own routine instead of the default minphys() 127467bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 127567bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 127667bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 127767bd71c6Sperrin * 56K on X86 and 128K on sparc). 127867bd71c6Sperrin */ 127967bd71c6Sperrin void 128067bd71c6Sperrin zvol_minphys(struct buf *bp) 128167bd71c6Sperrin { 128267bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 128367bd71c6Sperrin bp->b_bcount = zvol_maxphys; 128467bd71c6Sperrin } 128567bd71c6Sperrin 1286e7cbe64fSgw int 1287e7cbe64fSgw zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1288e7cbe64fSgw { 1289e7cbe64fSgw minor_t minor = getminor(dev); 1290e7cbe64fSgw zvol_state_t *zv; 1291e7cbe64fSgw int error = 0; 1292e7cbe64fSgw uint64_t size; 1293e7cbe64fSgw uint64_t boff; 1294e7cbe64fSgw uint64_t resid; 1295e7cbe64fSgw 1296c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1297e7cbe64fSgw if (zv == NULL) 1298e7cbe64fSgw return (ENXIO); 1299e7cbe64fSgw 1300e7cbe64fSgw boff = ldbtob(blkno); 1301e7cbe64fSgw resid = ldbtob(nblocks); 130288b7b0f2SMatthew Ahrens 130388b7b0f2SMatthew Ahrens VERIFY3U(boff + resid, <=, zv->zv_volsize); 130488b7b0f2SMatthew Ahrens 1305e7cbe64fSgw while (resid) { 1306e7cbe64fSgw size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 130788b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1308e7cbe64fSgw if (error) 1309e7cbe64fSgw break; 1310e7cbe64fSgw boff += size; 1311e7cbe64fSgw addr += size; 1312e7cbe64fSgw resid -= size; 1313e7cbe64fSgw } 1314e7cbe64fSgw 1315e7cbe64fSgw return (error); 1316e7cbe64fSgw } 1317e7cbe64fSgw 1318fa9e4066Sahrens /*ARGSUSED*/ 1319fa9e4066Sahrens int 1320feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1321fa9e4066Sahrens { 1322c7ca1008Sgw minor_t minor = getminor(dev); 1323c7ca1008Sgw zvol_state_t *zv; 132473ec3d9cSgw uint64_t volsize; 1325c2e6a7d6Sperrin rl_t *rl; 1326feb08c6bSbillm int error = 0; 1327fa9e4066Sahrens 1328c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1329c7ca1008Sgw if (zv == NULL) 1330c7ca1008Sgw return (ENXIO); 1331c7ca1008Sgw 133273ec3d9cSgw volsize = zv->zv_volsize; 133373ec3d9cSgw if (uio->uio_resid > 0 && 133473ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 133573ec3d9cSgw return (EIO); 133673ec3d9cSgw 133788b7b0f2SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 133888b7b0f2SMatthew Ahrens error = physio(zvol_strategy, NULL, dev, B_READ, 133988b7b0f2SMatthew Ahrens zvol_minphys, uio); 134088b7b0f2SMatthew Ahrens return (error); 134188b7b0f2SMatthew Ahrens } 134288b7b0f2SMatthew Ahrens 1343c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1344c2e6a7d6Sperrin RL_READER); 134573ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1346feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1347fa9e4066Sahrens 134873ec3d9cSgw /* don't read past the end */ 134973ec3d9cSgw if (bytes > volsize - uio->uio_loffset) 135073ec3d9cSgw bytes = volsize - uio->uio_loffset; 135173ec3d9cSgw 1352feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1353b87f3af3Sperrin if (error) { 1354b87f3af3Sperrin /* convert checksum errors into IO errors */ 1355b87f3af3Sperrin if (error == ECKSUM) 1356b87f3af3Sperrin error = EIO; 1357feb08c6bSbillm break; 1358b87f3af3Sperrin } 1359feb08c6bSbillm } 1360c2e6a7d6Sperrin zfs_range_unlock(rl); 1361feb08c6bSbillm return (error); 1362fa9e4066Sahrens } 1363fa9e4066Sahrens 1364fa9e4066Sahrens /*ARGSUSED*/ 1365fa9e4066Sahrens int 1366feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1367fa9e4066Sahrens { 1368c7ca1008Sgw minor_t minor = getminor(dev); 1369c7ca1008Sgw zvol_state_t *zv; 137073ec3d9cSgw uint64_t volsize; 1371c2e6a7d6Sperrin rl_t *rl; 1372feb08c6bSbillm int error = 0; 1373510b6c0eSNeil Perrin boolean_t sync; 1374feb08c6bSbillm 1375c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1376c7ca1008Sgw if (zv == NULL) 1377c7ca1008Sgw return (ENXIO); 1378c7ca1008Sgw 137973ec3d9cSgw volsize = zv->zv_volsize; 138073ec3d9cSgw if (uio->uio_resid > 0 && 138173ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 138273ec3d9cSgw return (EIO); 138373ec3d9cSgw 1384e7cbe64fSgw if (zv->zv_flags & ZVOL_DUMPIFIED) { 1385e7cbe64fSgw error = physio(zvol_strategy, NULL, dev, B_WRITE, 1386e7cbe64fSgw zvol_minphys, uio); 1387e7cbe64fSgw return (error); 1388e7cbe64fSgw } 1389e7cbe64fSgw 139055da60b9SMark J Musante sync = !(zv->zv_flags & ZVOL_WCE) || 139155da60b9SMark J Musante (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1392510b6c0eSNeil Perrin 1393c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1394c2e6a7d6Sperrin RL_WRITER); 139573ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1396feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1397feb08c6bSbillm uint64_t off = uio->uio_loffset; 1398feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 139973ec3d9cSgw 140073ec3d9cSgw if (bytes > volsize - off) /* don't write past the end */ 140173ec3d9cSgw bytes = volsize - off; 140273ec3d9cSgw 1403feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1404feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 1405feb08c6bSbillm if (error) { 1406feb08c6bSbillm dmu_tx_abort(tx); 1407feb08c6bSbillm break; 1408feb08c6bSbillm } 140994d1a210STim Haley error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx); 1410feb08c6bSbillm if (error == 0) 1411510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, bytes, sync); 1412feb08c6bSbillm dmu_tx_commit(tx); 1413feb08c6bSbillm 1414feb08c6bSbillm if (error) 1415feb08c6bSbillm break; 1416feb08c6bSbillm } 1417c2e6a7d6Sperrin zfs_range_unlock(rl); 1418510b6c0eSNeil Perrin if (sync) 14195002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1420feb08c6bSbillm return (error); 1421fa9e4066Sahrens } 1422fa9e4066Sahrens 1423c7f714e2SEric Taylor int 1424c7f714e2SEric Taylor zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1425c7f714e2SEric Taylor { 1426c7f714e2SEric Taylor struct uuid uuid = EFI_RESERVED; 1427c7f714e2SEric Taylor efi_gpe_t gpe = { 0 }; 1428c7f714e2SEric Taylor uint32_t crc; 1429c7f714e2SEric Taylor dk_efi_t efi; 1430c7f714e2SEric Taylor int length; 1431c7f714e2SEric Taylor char *ptr; 1432c7f714e2SEric Taylor 1433c7f714e2SEric Taylor if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1434c7f714e2SEric Taylor return (EFAULT); 1435c7f714e2SEric Taylor ptr = (char *)(uintptr_t)efi.dki_data_64; 1436c7f714e2SEric Taylor length = efi.dki_length; 1437c7f714e2SEric Taylor /* 1438c7f714e2SEric Taylor * Some clients may attempt to request a PMBR for the 1439c7f714e2SEric Taylor * zvol. Currently this interface will return EINVAL to 1440c7f714e2SEric Taylor * such requests. These requests could be supported by 1441c7f714e2SEric Taylor * adding a check for lba == 0 and consing up an appropriate 1442c7f714e2SEric Taylor * PMBR. 1443c7f714e2SEric Taylor */ 1444c7f714e2SEric Taylor if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1445c7f714e2SEric Taylor return (EINVAL); 1446c7f714e2SEric Taylor 1447c7f714e2SEric Taylor gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1448c7f714e2SEric Taylor gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1449c7f714e2SEric Taylor UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1450c7f714e2SEric Taylor 1451c7f714e2SEric Taylor if (efi.dki_lba == 1) { 1452c7f714e2SEric Taylor efi_gpt_t gpt = { 0 }; 1453c7f714e2SEric Taylor 1454c7f714e2SEric Taylor gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1455c7f714e2SEric Taylor gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1456c7f714e2SEric Taylor gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1457c7f714e2SEric Taylor gpt.efi_gpt_MyLBA = LE_64(1ULL); 1458c7f714e2SEric Taylor gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1459c7f714e2SEric Taylor gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1460c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1461c7f714e2SEric Taylor gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1462c7f714e2SEric Taylor gpt.efi_gpt_SizeOfPartitionEntry = 1463c7f714e2SEric Taylor LE_32(sizeof (efi_gpe_t)); 1464c7f714e2SEric Taylor CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1465c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1466c7f714e2SEric Taylor CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1467c7f714e2SEric Taylor gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1468c7f714e2SEric Taylor if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1469c7f714e2SEric Taylor flag)) 1470c7f714e2SEric Taylor return (EFAULT); 1471c7f714e2SEric Taylor ptr += sizeof (gpt); 1472c7f714e2SEric Taylor length -= sizeof (gpt); 1473c7f714e2SEric Taylor } 1474c7f714e2SEric Taylor if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1475c7f714e2SEric Taylor length), flag)) 1476c7f714e2SEric Taylor return (EFAULT); 1477c7f714e2SEric Taylor return (0); 1478c7f714e2SEric Taylor } 1479c7f714e2SEric Taylor 14803fb517f7SJames Moore /* 14813fb517f7SJames Moore * BEGIN entry points to allow external callers access to the volume. 14823fb517f7SJames Moore */ 14833fb517f7SJames Moore /* 14843fb517f7SJames Moore * Return the volume parameters needed for access from an external caller. 14853fb517f7SJames Moore * These values are invariant as long as the volume is held open. 14863fb517f7SJames Moore */ 14873fb517f7SJames Moore int 14883fb517f7SJames Moore zvol_get_volume_params(minor_t minor, uint64_t *blksize, 14893fb517f7SJames Moore uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 14903fb517f7SJames Moore void **rl_hdl, void **bonus_hdl) 14913fb517f7SJames Moore { 14923fb517f7SJames Moore zvol_state_t *zv; 14933fb517f7SJames Moore 1494c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1495c99e4bdcSChris Kirby if (zv == NULL) 14963fb517f7SJames Moore return (ENXIO); 14973fb517f7SJames Moore if (zv->zv_flags & ZVOL_DUMPIFIED) 14983fb517f7SJames Moore return (ENXIO); 14993fb517f7SJames Moore 15003fb517f7SJames Moore ASSERT(blksize && max_xfer_len && minor_hdl && 15013fb517f7SJames Moore objset_hdl && zil_hdl && rl_hdl && bonus_hdl); 15023fb517f7SJames Moore 15033fb517f7SJames Moore *blksize = zv->zv_volblocksize; 15043fb517f7SJames Moore *max_xfer_len = (uint64_t)zvol_maxphys; 15053fb517f7SJames Moore *minor_hdl = zv; 15063fb517f7SJames Moore *objset_hdl = zv->zv_objset; 15073fb517f7SJames Moore *zil_hdl = zv->zv_zilog; 15083fb517f7SJames Moore *rl_hdl = &zv->zv_znode; 15093fb517f7SJames Moore *bonus_hdl = zv->zv_dbuf; 15103fb517f7SJames Moore return (0); 15113fb517f7SJames Moore } 15123fb517f7SJames Moore 15133fb517f7SJames Moore /* 15143fb517f7SJames Moore * Return the current volume size to an external caller. 15153fb517f7SJames Moore * The size can change while the volume is open. 15163fb517f7SJames Moore */ 15173fb517f7SJames Moore uint64_t 15183fb517f7SJames Moore zvol_get_volume_size(void *minor_hdl) 15193fb517f7SJames Moore { 15203fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 15213fb517f7SJames Moore 15223fb517f7SJames Moore return (zv->zv_volsize); 15233fb517f7SJames Moore } 15243fb517f7SJames Moore 15253fb517f7SJames Moore /* 15263fb517f7SJames Moore * Return the current WCE setting to an external caller. 15273fb517f7SJames Moore * The WCE setting can change while the volume is open. 15283fb517f7SJames Moore */ 15293fb517f7SJames Moore int 15303fb517f7SJames Moore zvol_get_volume_wce(void *minor_hdl) 15313fb517f7SJames Moore { 15323fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 15333fb517f7SJames Moore 15343fb517f7SJames Moore return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 15353fb517f7SJames Moore } 15363fb517f7SJames Moore 15373fb517f7SJames Moore /* 15383fb517f7SJames Moore * Entry point for external callers to zvol_log_write 15393fb517f7SJames Moore */ 15403fb517f7SJames Moore void 15413fb517f7SJames Moore zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 15423fb517f7SJames Moore boolean_t sync) 15433fb517f7SJames Moore { 15443fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 15453fb517f7SJames Moore 15463fb517f7SJames Moore zvol_log_write(zv, tx, off, resid, sync); 15473fb517f7SJames Moore } 15483fb517f7SJames Moore /* 15493fb517f7SJames Moore * END entry points to allow external callers access to the volume. 15503fb517f7SJames Moore */ 15513fb517f7SJames Moore 1552b77b9231SDan McDonald /* 1553b77b9231SDan McDonald * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 1554b77b9231SDan McDonald */ 1555b77b9231SDan McDonald static void 1556b77b9231SDan McDonald zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 1557b77b9231SDan McDonald boolean_t sync) 1558b77b9231SDan McDonald { 1559b77b9231SDan McDonald itx_t *itx; 1560b77b9231SDan McDonald lr_truncate_t *lr; 1561b77b9231SDan McDonald zilog_t *zilog = zv->zv_zilog; 1562b77b9231SDan McDonald 1563b77b9231SDan McDonald if (zil_replaying(zilog, tx)) 1564b77b9231SDan McDonald return; 1565b77b9231SDan McDonald 1566b77b9231SDan McDonald itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 1567b77b9231SDan McDonald lr = (lr_truncate_t *)&itx->itx_lr; 1568b77b9231SDan McDonald lr->lr_foid = ZVOL_OBJ; 1569b77b9231SDan McDonald lr->lr_offset = off; 1570b77b9231SDan McDonald lr->lr_length = len; 1571b77b9231SDan McDonald 1572b77b9231SDan McDonald itx->itx_sync = sync; 1573b77b9231SDan McDonald zil_itx_assign(zilog, itx, tx); 1574b77b9231SDan McDonald } 1575b77b9231SDan McDonald 1576fa9e4066Sahrens /* 1577fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1578b77b9231SDan McDonald * Also a dirtbag dkio ioctl for unmap/free-block functionality. 1579fa9e4066Sahrens */ 1580fa9e4066Sahrens /*ARGSUSED*/ 1581fa9e4066Sahrens int 1582fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1583fa9e4066Sahrens { 1584fa9e4066Sahrens zvol_state_t *zv; 1585af2c4821Smaybee struct dk_cinfo dki; 1586fa9e4066Sahrens struct dk_minfo dkm; 1587af2c4821Smaybee struct dk_callback *dkc; 1588fa9e4066Sahrens int error = 0; 1589e7cbe64fSgw rl_t *rl; 1590fa9e4066Sahrens 1591c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 1592fa9e4066Sahrens 1593c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1594fa9e4066Sahrens 1595fa9e4066Sahrens if (zv == NULL) { 1596c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1597fa9e4066Sahrens return (ENXIO); 1598fa9e4066Sahrens } 1599701f66c4SEric Taylor ASSERT(zv->zv_total_opens > 0); 1600fa9e4066Sahrens 1601fa9e4066Sahrens switch (cmd) { 1602fa9e4066Sahrens 1603fa9e4066Sahrens case DKIOCINFO: 1604af2c4821Smaybee bzero(&dki, sizeof (dki)); 1605af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1606af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1607af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 16083adc9019SEric Taylor dki.dki_unit = getminor(dev); 1609af2c4821Smaybee dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1610c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1611af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1612fa9e4066Sahrens error = EFAULT; 1613fa9e4066Sahrens return (error); 1614fa9e4066Sahrens 1615fa9e4066Sahrens case DKIOCGMEDIAINFO: 1616fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1617fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1618fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1619fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1620c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1621fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1622fa9e4066Sahrens error = EFAULT; 1623fa9e4066Sahrens return (error); 1624fa9e4066Sahrens 1625fa9e4066Sahrens case DKIOCGETEFI: 1626c7f714e2SEric Taylor { 1627c7f714e2SEric Taylor uint64_t vs = zv->zv_volsize; 1628c7f714e2SEric Taylor uint8_t bs = zv->zv_min_bs; 1629fa9e4066Sahrens 1630c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1631c7f714e2SEric Taylor error = zvol_getefi((void *)arg, flag, vs, bs); 1632c7f714e2SEric Taylor return (error); 163368a5ac4dSmaybee } 1634fa9e4066Sahrens 1635feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1636af2c4821Smaybee dkc = (struct dk_callback *)arg; 1637c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 16385002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1639af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1640af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1641af2c4821Smaybee error = 0; 1642af2c4821Smaybee } 1643701f66c4SEric Taylor return (error); 1644701f66c4SEric Taylor 1645701f66c4SEric Taylor case DKIOCGETWCE: 1646701f66c4SEric Taylor { 1647701f66c4SEric Taylor int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1648701f66c4SEric Taylor if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1649701f66c4SEric Taylor flag)) 1650701f66c4SEric Taylor error = EFAULT; 1651701f66c4SEric Taylor break; 1652701f66c4SEric Taylor } 1653701f66c4SEric Taylor case DKIOCSETWCE: 1654701f66c4SEric Taylor { 1655701f66c4SEric Taylor int wce; 1656701f66c4SEric Taylor if (ddi_copyin((void *)arg, &wce, sizeof (int), 1657701f66c4SEric Taylor flag)) { 1658701f66c4SEric Taylor error = EFAULT; 1659701f66c4SEric Taylor break; 1660701f66c4SEric Taylor } 1661701f66c4SEric Taylor if (wce) { 1662701f66c4SEric Taylor zv->zv_flags |= ZVOL_WCE; 1663c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1664701f66c4SEric Taylor } else { 1665701f66c4SEric Taylor zv->zv_flags &= ~ZVOL_WCE; 1666c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 16675002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1668701f66c4SEric Taylor } 1669701f66c4SEric Taylor return (0); 1670701f66c4SEric Taylor } 1671feb08c6bSbillm 1672b6130eadSmaybee case DKIOCGGEOM: 1673b6130eadSmaybee case DKIOCGVTOC: 1674e7cbe64fSgw /* 1675e7cbe64fSgw * commands using these (like prtvtoc) expect ENOTSUP 1676e7cbe64fSgw * since we're emulating an EFI label 1677e7cbe64fSgw */ 1678b6130eadSmaybee error = ENOTSUP; 1679b6130eadSmaybee break; 1680b6130eadSmaybee 1681e7cbe64fSgw case DKIOCDUMPINIT: 1682e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1683e7cbe64fSgw RL_WRITER); 1684e7cbe64fSgw error = zvol_dumpify(zv); 1685e7cbe64fSgw zfs_range_unlock(rl); 1686e7cbe64fSgw break; 1687e7cbe64fSgw 1688e7cbe64fSgw case DKIOCDUMPFINI: 168906d5ae10SEric Taylor if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 169006d5ae10SEric Taylor break; 1691e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1692e7cbe64fSgw RL_WRITER); 1693e7cbe64fSgw error = zvol_dump_fini(zv); 1694e7cbe64fSgw zfs_range_unlock(rl); 1695e7cbe64fSgw break; 1696e7cbe64fSgw 1697b77b9231SDan McDonald case DKIOCFREE: 1698b77b9231SDan McDonald { 1699b77b9231SDan McDonald dkioc_free_t df; 1700b77b9231SDan McDonald dmu_tx_t *tx; 1701b77b9231SDan McDonald 1702b77b9231SDan McDonald if (ddi_copyin((void *)arg, &df, sizeof (df), flag)) { 1703b77b9231SDan McDonald error = EFAULT; 1704b77b9231SDan McDonald break; 1705b77b9231SDan McDonald } 1706b77b9231SDan McDonald 1707b77b9231SDan McDonald /* 1708b77b9231SDan McDonald * Apply Postel's Law to length-checking. If they overshoot, 1709b77b9231SDan McDonald * just blank out until the end, if there's a need to blank 1710b77b9231SDan McDonald * out anything. 1711b77b9231SDan McDonald */ 1712b77b9231SDan McDonald if (df.df_start >= zv->zv_volsize) 1713b77b9231SDan McDonald break; /* No need to do anything... */ 1714b77b9231SDan McDonald if (df.df_start + df.df_length > zv->zv_volsize) 1715b77b9231SDan McDonald df.df_length = DMU_OBJECT_END; 1716b77b9231SDan McDonald 1717b77b9231SDan McDonald rl = zfs_range_lock(&zv->zv_znode, df.df_start, df.df_length, 1718b77b9231SDan McDonald RL_WRITER); 1719b77b9231SDan McDonald tx = dmu_tx_create(zv->zv_objset); 1720b77b9231SDan McDonald error = dmu_tx_assign(tx, TXG_WAIT); 1721b77b9231SDan McDonald if (error != 0) { 1722b77b9231SDan McDonald dmu_tx_abort(tx); 1723b77b9231SDan McDonald } else { 1724b77b9231SDan McDonald zvol_log_truncate(zv, tx, df.df_start, 1725b77b9231SDan McDonald df.df_length, B_TRUE); 1726c08b1637SJosef 'Jeff' Sipek dmu_tx_commit(tx); 1727b77b9231SDan McDonald error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 1728b77b9231SDan McDonald df.df_start, df.df_length); 1729b77b9231SDan McDonald } 1730b77b9231SDan McDonald 1731b77b9231SDan McDonald zfs_range_unlock(rl); 1732b77b9231SDan McDonald 1733b77b9231SDan McDonald if (error == 0) { 1734b77b9231SDan McDonald /* 1735b77b9231SDan McDonald * If the write-cache is disabled or 'sync' property 1736b77b9231SDan McDonald * is set to 'always' then treat this as a synchronous 1737b77b9231SDan McDonald * operation (i.e. commit to zil). 1738b77b9231SDan McDonald */ 1739b77b9231SDan McDonald if (!(zv->zv_flags & ZVOL_WCE) || 1740b77b9231SDan McDonald (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) 1741b77b9231SDan McDonald zil_commit(zv->zv_zilog, ZVOL_OBJ); 1742b77b9231SDan McDonald 1743b77b9231SDan McDonald /* 1744b77b9231SDan McDonald * If the caller really wants synchronous writes, and 1745b77b9231SDan McDonald * can't wait for them, don't return until the write 1746b77b9231SDan McDonald * is done. 1747b77b9231SDan McDonald */ 1748b77b9231SDan McDonald if (df.df_flags & DF_WAIT_SYNC) { 1749b77b9231SDan McDonald txg_wait_synced( 1750b77b9231SDan McDonald dmu_objset_pool(zv->zv_objset), 0); 1751b77b9231SDan McDonald } 1752b77b9231SDan McDonald } 1753b77b9231SDan McDonald break; 1754b77b9231SDan McDonald } 1755b77b9231SDan McDonald 1756fa9e4066Sahrens default: 175768a5ac4dSmaybee error = ENOTTY; 1758fa9e4066Sahrens break; 1759fa9e4066Sahrens 1760fa9e4066Sahrens } 1761c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1762fa9e4066Sahrens return (error); 1763fa9e4066Sahrens } 1764fa9e4066Sahrens 1765fa9e4066Sahrens int 1766fa9e4066Sahrens zvol_busy(void) 1767fa9e4066Sahrens { 1768fa9e4066Sahrens return (zvol_minors != 0); 1769fa9e4066Sahrens } 1770fa9e4066Sahrens 1771fa9e4066Sahrens void 1772fa9e4066Sahrens zvol_init(void) 1773fa9e4066Sahrens { 1774c99e4bdcSChris Kirby VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1775c99e4bdcSChris Kirby 1) == 0); 1776c99e4bdcSChris Kirby mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1777fa9e4066Sahrens } 1778fa9e4066Sahrens 1779fa9e4066Sahrens void 1780fa9e4066Sahrens zvol_fini(void) 1781fa9e4066Sahrens { 1782c99e4bdcSChris Kirby mutex_destroy(&zfsdev_state_lock); 1783c99e4bdcSChris Kirby ddi_soft_state_fini(&zfsdev_state); 1784fa9e4066Sahrens } 1785e7cbe64fSgw 1786e7cbe64fSgw static int 1787e7cbe64fSgw zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1788e7cbe64fSgw { 1789e7cbe64fSgw dmu_tx_t *tx; 1790e7cbe64fSgw int error = 0; 1791e7cbe64fSgw objset_t *os = zv->zv_objset; 1792e7cbe64fSgw nvlist_t *nv = NULL; 17938d265e66SGeorge Wilson uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1794e7cbe64fSgw 1795c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1796681d9761SEric Taylor error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1797681d9761SEric Taylor DMU_OBJECT_END); 1798681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1799681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1800e7cbe64fSgw 1801e7cbe64fSgw tx = dmu_tx_create(os); 1802e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1803681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1804e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1805e7cbe64fSgw if (error) { 1806e7cbe64fSgw dmu_tx_abort(tx); 1807e7cbe64fSgw return (error); 1808e7cbe64fSgw } 1809e7cbe64fSgw 1810e7cbe64fSgw /* 1811e7cbe64fSgw * If we are resizing the dump device then we only need to 1812e7cbe64fSgw * update the refreservation to match the newly updated 1813e7cbe64fSgw * zvolsize. Otherwise, we save off the original state of the 1814e7cbe64fSgw * zvol so that we can restore them if the zvol is ever undumpified. 1815e7cbe64fSgw */ 1816e7cbe64fSgw if (resize) { 1817e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, 1818e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1819e7cbe64fSgw &zv->zv_volsize, tx); 1820e7cbe64fSgw } else { 1821afee20e4SGeorge Wilson uint64_t checksum, compress, refresrv, vbs, dedup; 182288b7b0f2SMatthew Ahrens 1823e7cbe64fSgw error = dsl_prop_get_integer(zv->zv_name, 1824e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1825e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1826e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1827e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1828e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 182988b7b0f2SMatthew Ahrens error = error ? error : dsl_prop_get_integer(zv->zv_name, 183088b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 18318d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP) { 18328d265e66SGeorge Wilson error = error ? error : 18338d265e66SGeorge Wilson dsl_prop_get_integer(zv->zv_name, 18348d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 18358d265e66SGeorge Wilson } 1836e7cbe64fSgw 1837e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1838e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1839e7cbe64fSgw &compress, tx); 1840e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1841e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1842e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1843e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1844e7cbe64fSgw &refresrv, tx); 184588b7b0f2SMatthew Ahrens error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 184688b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 184788b7b0f2SMatthew Ahrens &vbs, tx); 1848681d9761SEric Taylor error = error ? error : dmu_object_set_blocksize( 1849681d9761SEric Taylor os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx); 18508d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP) { 18518d265e66SGeorge Wilson error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 18528d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 18538d265e66SGeorge Wilson &dedup, tx); 18548d265e66SGeorge Wilson } 1855681d9761SEric Taylor if (error == 0) 1856681d9761SEric Taylor zv->zv_volblocksize = SPA_MAXBLOCKSIZE; 1857e7cbe64fSgw } 1858e7cbe64fSgw dmu_tx_commit(tx); 1859e7cbe64fSgw 1860e7cbe64fSgw /* 1861e7cbe64fSgw * We only need update the zvol's property if we are initializing 1862e7cbe64fSgw * the dump area for the first time. 1863e7cbe64fSgw */ 1864e7cbe64fSgw if (!resize) { 1865e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1866e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1867e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1868e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1869e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1870e7cbe64fSgw ZIO_COMPRESS_OFF) == 0); 1871e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1872e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1873e7cbe64fSgw ZIO_CHECKSUM_OFF) == 0); 18748d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP) { 18758d265e66SGeorge Wilson VERIFY(nvlist_add_uint64(nv, 18768d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 18778d265e66SGeorge Wilson ZIO_CHECKSUM_OFF) == 0); 18788d265e66SGeorge Wilson } 1879e7cbe64fSgw 188092241e0bSTom Erickson error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 188192241e0bSTom Erickson nv, NULL); 1882e7cbe64fSgw nvlist_free(nv); 1883e7cbe64fSgw 1884e7cbe64fSgw if (error) 1885e7cbe64fSgw return (error); 1886e7cbe64fSgw } 1887e7cbe64fSgw 1888e7cbe64fSgw /* Allocate the space for the dump */ 1889e7cbe64fSgw error = zvol_prealloc(zv); 1890e7cbe64fSgw return (error); 1891e7cbe64fSgw } 1892e7cbe64fSgw 1893e7cbe64fSgw static int 1894e7cbe64fSgw zvol_dumpify(zvol_state_t *zv) 1895e7cbe64fSgw { 1896e7cbe64fSgw int error = 0; 1897e7cbe64fSgw uint64_t dumpsize = 0; 1898e7cbe64fSgw dmu_tx_t *tx; 1899e7cbe64fSgw objset_t *os = zv->zv_objset; 1900e7cbe64fSgw 1901681d9761SEric Taylor if (zv->zv_flags & ZVOL_RDONLY) 1902e7cbe64fSgw return (EROFS); 1903e7cbe64fSgw 1904e7cbe64fSgw if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1905e7cbe64fSgw 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 19064445fffbSMatthew Ahrens boolean_t resize = (dumpsize > 0); 1907e7cbe64fSgw 1908e7cbe64fSgw if ((error = zvol_dump_init(zv, resize)) != 0) { 1909e7cbe64fSgw (void) zvol_dump_fini(zv); 1910e7cbe64fSgw return (error); 1911e7cbe64fSgw } 1912e7cbe64fSgw } 1913e7cbe64fSgw 1914e7cbe64fSgw /* 1915e7cbe64fSgw * Build up our lba mapping. 1916e7cbe64fSgw */ 1917e7cbe64fSgw error = zvol_get_lbas(zv); 1918e7cbe64fSgw if (error) { 1919e7cbe64fSgw (void) zvol_dump_fini(zv); 1920e7cbe64fSgw return (error); 1921e7cbe64fSgw } 1922e7cbe64fSgw 1923e7cbe64fSgw tx = dmu_tx_create(os); 1924e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1925e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1926e7cbe64fSgw if (error) { 1927e7cbe64fSgw dmu_tx_abort(tx); 1928e7cbe64fSgw (void) zvol_dump_fini(zv); 1929e7cbe64fSgw return (error); 1930e7cbe64fSgw } 1931e7cbe64fSgw 1932e7cbe64fSgw zv->zv_flags |= ZVOL_DUMPIFIED; 1933e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1934e7cbe64fSgw &zv->zv_volsize, tx); 1935e7cbe64fSgw dmu_tx_commit(tx); 1936e7cbe64fSgw 1937e7cbe64fSgw if (error) { 1938e7cbe64fSgw (void) zvol_dump_fini(zv); 1939e7cbe64fSgw return (error); 1940e7cbe64fSgw } 1941e7cbe64fSgw 1942e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 1943e7cbe64fSgw return (0); 1944e7cbe64fSgw } 1945e7cbe64fSgw 1946e7cbe64fSgw static int 1947e7cbe64fSgw zvol_dump_fini(zvol_state_t *zv) 1948e7cbe64fSgw { 1949e7cbe64fSgw dmu_tx_t *tx; 1950e7cbe64fSgw objset_t *os = zv->zv_objset; 1951e7cbe64fSgw nvlist_t *nv; 1952e7cbe64fSgw int error = 0; 1953afee20e4SGeorge Wilson uint64_t checksum, compress, refresrv, vbs, dedup; 19548d265e66SGeorge Wilson uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1955e7cbe64fSgw 1956b7e50089Smaybee /* 1957b7e50089Smaybee * Attempt to restore the zvol back to its pre-dumpified state. 1958b7e50089Smaybee * This is a best-effort attempt as it's possible that not all 1959b7e50089Smaybee * of these properties were initialized during the dumpify process 1960b7e50089Smaybee * (i.e. error during zvol_dump_init). 1961b7e50089Smaybee */ 1962b7e50089Smaybee 1963e7cbe64fSgw tx = dmu_tx_create(os); 1964e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1965e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1966e7cbe64fSgw if (error) { 1967e7cbe64fSgw dmu_tx_abort(tx); 1968e7cbe64fSgw return (error); 1969e7cbe64fSgw } 1970b7e50089Smaybee (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1971b7e50089Smaybee dmu_tx_commit(tx); 1972e7cbe64fSgw 1973e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1974e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1975e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1976e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1977e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1978e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 197988b7b0f2SMatthew Ahrens (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 198088b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1981e7cbe64fSgw 1982e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1983e7cbe64fSgw (void) nvlist_add_uint64(nv, 1984e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1985e7cbe64fSgw (void) nvlist_add_uint64(nv, 1986e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1987e7cbe64fSgw (void) nvlist_add_uint64(nv, 1988e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 19898d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP && 19908d265e66SGeorge Wilson zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 19918d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 19928d265e66SGeorge Wilson (void) nvlist_add_uint64(nv, 19938d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 19948d265e66SGeorge Wilson } 199592241e0bSTom Erickson (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 199692241e0bSTom Erickson nv, NULL); 1997e7cbe64fSgw nvlist_free(nv); 1998e7cbe64fSgw 1999b7e50089Smaybee zvol_free_extents(zv); 2000b7e50089Smaybee zv->zv_flags &= ~ZVOL_DUMPIFIED; 2001b7e50089Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2002681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 2003681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2004681d9761SEric Taylor tx = dmu_tx_create(os); 2005681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2006681d9761SEric Taylor error = dmu_tx_assign(tx, TXG_WAIT); 2007681d9761SEric Taylor if (error) { 2008681d9761SEric Taylor dmu_tx_abort(tx); 2009681d9761SEric Taylor return (error); 2010681d9761SEric Taylor } 2011b24ab676SJeff Bonwick if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2012b24ab676SJeff Bonwick zv->zv_volblocksize = vbs; 2013681d9761SEric Taylor dmu_tx_commit(tx); 2014b7e50089Smaybee 2015e7cbe64fSgw return (0); 2016e7cbe64fSgw } 2017