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 * 26047c81d3SSaso Kiselkov * Copyright 2017 Nexenta Systems, Inc. All rights reserved. 27*25df42a1SMatthew Ahrens * Copyright (c) 2012, 2020 by Delphix. All rights reserved. 28c3d26abcSMatthew Ahrens * Copyright (c) 2014 Integros [integros.com] 29455e370cSJohn Levon * Copyright 2019 Joyent, Inc. 30fa9e4066Sahrens */ 31fa9e4066Sahrens 32fa9e4066Sahrens /* 33fa9e4066Sahrens * ZFS volume emulation driver. 34fa9e4066Sahrens * 35fa9e4066Sahrens * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 36fa9e4066Sahrens * Volumes are accessed through the symbolic links named: 37fa9e4066Sahrens * 38fa9e4066Sahrens * /dev/zvol/dsk/<pool_name>/<dataset_name> 39fa9e4066Sahrens * /dev/zvol/rdsk/<pool_name>/<dataset_name> 40fa9e4066Sahrens * 41681d9761SEric Taylor * These links are created by the /dev filesystem (sdev_zvolops.c). 42fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 43fa9e4066Sahrens * run before opening and using a device. 44fa9e4066Sahrens */ 45fa9e4066Sahrens 46fa9e4066Sahrens #include <sys/types.h> 47fa9e4066Sahrens #include <sys/param.h> 48fa9e4066Sahrens #include <sys/errno.h> 49fa9e4066Sahrens #include <sys/uio.h> 50fa9e4066Sahrens #include <sys/buf.h> 51fa9e4066Sahrens #include <sys/modctl.h> 52fa9e4066Sahrens #include <sys/open.h> 53fa9e4066Sahrens #include <sys/kmem.h> 54fa9e4066Sahrens #include <sys/conf.h> 55fa9e4066Sahrens #include <sys/cmn_err.h> 56fa9e4066Sahrens #include <sys/stat.h> 57fa9e4066Sahrens #include <sys/zap.h> 58fa9e4066Sahrens #include <sys/spa.h> 59810e43b2SBill Pijewski #include <sys/spa_impl.h> 60fa9e4066Sahrens #include <sys/zio.h> 61e7cbe64fSgw #include <sys/dmu_traverse.h> 62e7cbe64fSgw #include <sys/dnode.h> 63e7cbe64fSgw #include <sys/dsl_dataset.h> 64fa9e4066Sahrens #include <sys/dsl_prop.h> 65fa9e4066Sahrens #include <sys/dkio.h> 66fa9e4066Sahrens #include <sys/efi_partition.h> 67fa9e4066Sahrens #include <sys/byteorder.h> 68fa9e4066Sahrens #include <sys/pathname.h> 69fa9e4066Sahrens #include <sys/ddi.h> 70fa9e4066Sahrens #include <sys/sunddi.h> 71fa9e4066Sahrens #include <sys/crc32.h> 72fa9e4066Sahrens #include <sys/dirent.h> 73fa9e4066Sahrens #include <sys/policy.h> 74fa9e4066Sahrens #include <sys/fs/zfs.h> 75fa9e4066Sahrens #include <sys/zfs_ioctl.h> 76fa9e4066Sahrens #include <sys/mkdev.h> 7722ac5be4Sperrin #include <sys/zil.h> 78c5c6ffa0Smaybee #include <sys/refcount.h> 79c2e6a7d6Sperrin #include <sys/zfs_znode.h> 80c2e6a7d6Sperrin #include <sys/zfs_rlock.h> 81e7cbe64fSgw #include <sys/vdev_impl.h> 82e7cbe64fSgw #include <sys/zvol.h> 83e7cbe64fSgw #include <sys/dumphdr.h> 841209a471SNeil Perrin #include <sys/zil_impl.h> 8580901aeaSGeorge Wilson #include <sys/dbuf.h> 86810e43b2SBill Pijewski #include <sys/dmu_tx.h> 87810e43b2SBill Pijewski #include <sys/zfeature.h> 88810e43b2SBill Pijewski #include <sys/zio_checksum.h> 891271e4b1SPrakash Surya #include <sys/zil_impl.h> 90c3377ee9SJohn Levon #include <sys/smt.h> 91047c81d3SSaso Kiselkov #include <sys/dkioc_free_util.h> 9279315247SMatthew Ahrens #include <sys/zfs_rlock.h> 93fa9e4066Sahrens 94fa9e4066Sahrens #include "zfs_namecheck.h" 95fa9e4066Sahrens 96c99e4bdcSChris Kirby void *zfsdev_state; 97503ad85cSMatthew Ahrens static char *zvol_tag = "zvol_tag"; 98fa9e4066Sahrens 99e7cbe64fSgw #define ZVOL_DUMPSIZE "dumpsize" 100e7cbe64fSgw 101fa9e4066Sahrens /* 102c99e4bdcSChris Kirby * This lock protects the zfsdev_state structure from being modified 103fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 104fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 105fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 106fa9e4066Sahrens */ 107c99e4bdcSChris Kirby kmutex_t zfsdev_state_lock; 108fa9e4066Sahrens static uint32_t zvol_minors; 109fa9e4066Sahrens 110e7cbe64fSgw typedef struct zvol_extent { 11188b7b0f2SMatthew Ahrens list_node_t ze_node; 112e7cbe64fSgw dva_t ze_dva; /* dva associated with this extent */ 11388b7b0f2SMatthew Ahrens uint64_t ze_nblks; /* number of blocks in extent */ 114e7cbe64fSgw } zvol_extent_t; 115e7cbe64fSgw 116fa9e4066Sahrens /* 117fa9e4066Sahrens * The in-core state of each volume. 118fa9e4066Sahrens */ 119fa9e4066Sahrens typedef struct zvol_state { 120fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 121fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 12267bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 123fa9e4066Sahrens minor_t zv_minor; /* minor number */ 124fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 125701f66c4SEric Taylor uint8_t zv_flags; /* readonly, dumpified, etc. */ 126fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 127fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 128fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 12922ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 13088b7b0f2SMatthew Ahrens list_t zv_extents; /* List of extents for dump */ 13179315247SMatthew Ahrens rangelock_t zv_rangelock; 1328dfe5547SRichard Yao dnode_t *zv_dn; /* dnode hold */ 133fa9e4066Sahrens } zvol_state_t; 134fa9e4066Sahrens 135e7cbe64fSgw /* 136e7cbe64fSgw * zvol specific flags 137e7cbe64fSgw */ 138e7cbe64fSgw #define ZVOL_RDONLY 0x1 139e7cbe64fSgw #define ZVOL_DUMPIFIED 0x2 140c7f714e2SEric Taylor #define ZVOL_EXCL 0x4 141701f66c4SEric Taylor #define ZVOL_WCE 0x8 142e7cbe64fSgw 14367bd71c6Sperrin /* 14467bd71c6Sperrin * zvol maximum transfer in one DMU tx. 14567bd71c6Sperrin */ 14667bd71c6Sperrin int zvol_maxphys = DMU_MAX_ACCESS/2; 14767bd71c6Sperrin 148893c83baSGeorge Wilson /* 149893c83baSGeorge Wilson * Toggle unmap functionality. 150893c83baSGeorge Wilson */ 151893c83baSGeorge Wilson boolean_t zvol_unmap_enabled = B_TRUE; 152893c83baSGeorge Wilson 1531c9272b8SStephen Blinick /* 1541c9272b8SStephen Blinick * If true, unmaps requested as synchronous are executed synchronously, 1551c9272b8SStephen Blinick * otherwise all unmaps are asynchronous. 1561c9272b8SStephen Blinick */ 1571c9272b8SStephen Blinick boolean_t zvol_unmap_sync_enabled = B_FALSE; 1581c9272b8SStephen Blinick 15992241e0bSTom Erickson extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 1604445fffbSMatthew Ahrens nvlist_t *, nvlist_t *); 161681d9761SEric Taylor static int zvol_remove_zv(zvol_state_t *); 1621271e4b1SPrakash Surya static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, 1631271e4b1SPrakash Surya struct lwb *lwb, zio_t *zio); 164e7cbe64fSgw static int zvol_dumpify(zvol_state_t *zv); 165e7cbe64fSgw static int zvol_dump_fini(zvol_state_t *zv); 166e7cbe64fSgw static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 16767bd71c6Sperrin 168fa9e4066Sahrens static void 169c61ea566SGeorge Wilson zvol_size_changed(zvol_state_t *zv, uint64_t volsize) 170fa9e4066Sahrens { 171c61ea566SGeorge Wilson dev_t dev = makedevice(ddi_driver_major(zfs_dip), zv->zv_minor); 172fa9e4066Sahrens 173c61ea566SGeorge Wilson zv->zv_volsize = volsize; 174fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 175681d9761SEric Taylor "Size", volsize) == DDI_SUCCESS); 176fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 177681d9761SEric Taylor "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 178e7cbe64fSgw 179e7cbe64fSgw /* Notify specfs to invalidate the cached size */ 180e7cbe64fSgw spec_size_invalidate(dev, VBLK); 181e7cbe64fSgw spec_size_invalidate(dev, VCHR); 182fa9e4066Sahrens } 183fa9e4066Sahrens 184fa9e4066Sahrens int 185e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 186fa9e4066Sahrens { 187e9dbad6fSeschrock if (volsize == 0) 188be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 189fa9e4066Sahrens 190e9dbad6fSeschrock if (volsize % blocksize != 0) 191be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 1925c5460e9Seschrock 193fa9e4066Sahrens #ifdef _ILP32 194e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 195be6fd75aSMatthew Ahrens return (SET_ERROR(EOVERFLOW)); 196fa9e4066Sahrens #endif 197fa9e4066Sahrens return (0); 198fa9e4066Sahrens } 199fa9e4066Sahrens 200fa9e4066Sahrens int 201e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 202fa9e4066Sahrens { 203e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 204b5152584SMatthew Ahrens volblocksize > SPA_OLD_MAXBLOCKSIZE || 205e9dbad6fSeschrock !ISP2(volblocksize)) 206be6fd75aSMatthew Ahrens return (SET_ERROR(EDOM)); 207fa9e4066Sahrens 208fa9e4066Sahrens return (0); 209fa9e4066Sahrens } 210fa9e4066Sahrens 211fa9e4066Sahrens int 212a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 213fa9e4066Sahrens { 214fa9e4066Sahrens int error; 215fa9e4066Sahrens dmu_object_info_t doi; 216a2eea2e1Sahrens uint64_t val; 217fa9e4066Sahrens 218a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 219fa9e4066Sahrens if (error) 220fa9e4066Sahrens return (error); 221fa9e4066Sahrens 222a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 223a2eea2e1Sahrens 224fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 225fa9e4066Sahrens 226a2eea2e1Sahrens if (error == 0) { 227a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 228a2eea2e1Sahrens doi.doi_data_block_size); 229a2eea2e1Sahrens } 230fa9e4066Sahrens 231fa9e4066Sahrens return (error); 232fa9e4066Sahrens } 233fa9e4066Sahrens 234fa9e4066Sahrens static zvol_state_t * 235e9dbad6fSeschrock zvol_minor_lookup(const char *name) 236fa9e4066Sahrens { 237fa9e4066Sahrens minor_t minor; 238fa9e4066Sahrens zvol_state_t *zv; 239fa9e4066Sahrens 240c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 241fa9e4066Sahrens 242c99e4bdcSChris Kirby for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 243c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 244fa9e4066Sahrens if (zv == NULL) 245fa9e4066Sahrens continue; 246fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 247f80ce222SChris Kirby return (zv); 248fa9e4066Sahrens } 249fa9e4066Sahrens 250f80ce222SChris Kirby return (NULL); 251fa9e4066Sahrens } 252fa9e4066Sahrens 253e7cbe64fSgw /* extent mapping arg */ 254e7cbe64fSgw struct maparg { 25588b7b0f2SMatthew Ahrens zvol_state_t *ma_zv; 25688b7b0f2SMatthew Ahrens uint64_t ma_blks; 257e7cbe64fSgw }; 258e7cbe64fSgw 259e7cbe64fSgw /*ARGSUSED*/ 260e7cbe64fSgw static int 2611b912ec7SGeorge Wilson zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, 2627802d7bfSMatthew Ahrens const zbookmark_phys_t *zb, const dnode_phys_t *dnp, void *arg) 263e7cbe64fSgw { 26488b7b0f2SMatthew Ahrens struct maparg *ma = arg; 26588b7b0f2SMatthew Ahrens zvol_extent_t *ze; 26688b7b0f2SMatthew Ahrens int bs = ma->ma_zv->zv_volblocksize; 267e7cbe64fSgw 268a2cdcdd2SPaul Dagnelie if (bp == NULL || BP_IS_HOLE(bp) || 26943466aaeSMax Grossman zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 27088b7b0f2SMatthew Ahrens return (0); 271e7cbe64fSgw 2725d7b4d43SMatthew Ahrens VERIFY(!BP_IS_EMBEDDED(bp)); 2735d7b4d43SMatthew Ahrens 27488b7b0f2SMatthew Ahrens VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 27588b7b0f2SMatthew Ahrens ma->ma_blks++; 276e7cbe64fSgw 27788b7b0f2SMatthew Ahrens /* Abort immediately if we have encountered gang blocks */ 27888b7b0f2SMatthew Ahrens if (BP_IS_GANG(bp)) 279be6fd75aSMatthew Ahrens return (SET_ERROR(EFRAGS)); 280e7cbe64fSgw 28188b7b0f2SMatthew Ahrens /* 28288b7b0f2SMatthew Ahrens * See if the block is at the end of the previous extent. 28388b7b0f2SMatthew Ahrens */ 28488b7b0f2SMatthew Ahrens ze = list_tail(&ma->ma_zv->zv_extents); 28588b7b0f2SMatthew Ahrens if (ze && 28688b7b0f2SMatthew Ahrens DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 28788b7b0f2SMatthew Ahrens DVA_GET_OFFSET(BP_IDENTITY(bp)) == 28888b7b0f2SMatthew Ahrens DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 28988b7b0f2SMatthew Ahrens ze->ze_nblks++; 29088b7b0f2SMatthew Ahrens return (0); 291e7cbe64fSgw } 292e7cbe64fSgw 29388b7b0f2SMatthew Ahrens dprintf_bp(bp, "%s", "next blkptr:"); 294e7cbe64fSgw 29588b7b0f2SMatthew Ahrens /* start a new extent */ 29688b7b0f2SMatthew Ahrens ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 29788b7b0f2SMatthew Ahrens ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 29888b7b0f2SMatthew Ahrens ze->ze_nblks = 1; 29988b7b0f2SMatthew Ahrens list_insert_tail(&ma->ma_zv->zv_extents, ze); 30088b7b0f2SMatthew Ahrens return (0); 30188b7b0f2SMatthew Ahrens } 302e7cbe64fSgw 30388b7b0f2SMatthew Ahrens static void 30488b7b0f2SMatthew Ahrens zvol_free_extents(zvol_state_t *zv) 30588b7b0f2SMatthew Ahrens { 30688b7b0f2SMatthew Ahrens zvol_extent_t *ze; 307e7cbe64fSgw 30888b7b0f2SMatthew Ahrens while (ze = list_head(&zv->zv_extents)) { 30988b7b0f2SMatthew Ahrens list_remove(&zv->zv_extents, ze); 31088b7b0f2SMatthew Ahrens kmem_free(ze, sizeof (zvol_extent_t)); 311e7cbe64fSgw } 31288b7b0f2SMatthew Ahrens } 313e7cbe64fSgw 31488b7b0f2SMatthew Ahrens static int 31588b7b0f2SMatthew Ahrens zvol_get_lbas(zvol_state_t *zv) 31688b7b0f2SMatthew Ahrens { 3173adc9019SEric Taylor objset_t *os = zv->zv_objset; 31888b7b0f2SMatthew Ahrens struct maparg ma; 31988b7b0f2SMatthew Ahrens int err; 32088b7b0f2SMatthew Ahrens 32188b7b0f2SMatthew Ahrens ma.ma_zv = zv; 32288b7b0f2SMatthew Ahrens ma.ma_blks = 0; 32388b7b0f2SMatthew Ahrens zvol_free_extents(zv); 32488b7b0f2SMatthew Ahrens 3253adc9019SEric Taylor /* commit any in-flight changes before traversing the dataset */ 3263adc9019SEric Taylor txg_wait_synced(dmu_objset_pool(os), 0); 3273adc9019SEric Taylor err = traverse_dataset(dmu_objset_ds(os), 0, 32888b7b0f2SMatthew Ahrens TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 32988b7b0f2SMatthew Ahrens if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 33088b7b0f2SMatthew Ahrens zvol_free_extents(zv); 33188b7b0f2SMatthew Ahrens return (err ? err : EIO); 332e7cbe64fSgw } 33388b7b0f2SMatthew Ahrens 334e7cbe64fSgw return (0); 335e7cbe64fSgw } 336e7cbe64fSgw 337ecd6cf80Smarks /* ARGSUSED */ 338fa9e4066Sahrens void 339ecd6cf80Smarks zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 340fa9e4066Sahrens { 341da6c28aaSamw zfs_creat_t *zct = arg; 342da6c28aaSamw nvlist_t *nvprops = zct->zct_props; 343fa9e4066Sahrens int error; 344e9dbad6fSeschrock uint64_t volblocksize, volsize; 345fa9e4066Sahrens 346ecd6cf80Smarks VERIFY(nvlist_lookup_uint64(nvprops, 347e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 348ecd6cf80Smarks if (nvlist_lookup_uint64(nvprops, 349e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 350e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 351e9dbad6fSeschrock 352e9dbad6fSeschrock /* 353e7cbe64fSgw * These properties must be removed from the list so the generic 354e9dbad6fSeschrock * property setting step won't apply to them. 355e9dbad6fSeschrock */ 356ecd6cf80Smarks VERIFY(nvlist_remove_all(nvprops, 357e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 358ecd6cf80Smarks (void) nvlist_remove_all(nvprops, 359e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 360e9dbad6fSeschrock 361e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 362fa9e4066Sahrens DMU_OT_NONE, 0, tx); 363fa9e4066Sahrens ASSERT(error == 0); 364fa9e4066Sahrens 365fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 366fa9e4066Sahrens DMU_OT_NONE, 0, tx); 367fa9e4066Sahrens ASSERT(error == 0); 368fa9e4066Sahrens 369e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 370fa9e4066Sahrens ASSERT(error == 0); 371fa9e4066Sahrens } 372fa9e4066Sahrens 373b77b9231SDan McDonald /* 374b77b9231SDan McDonald * Replay a TX_TRUNCATE ZIL transaction if asked. TX_TRUNCATE is how we 375b77b9231SDan McDonald * implement DKIOCFREE/free-long-range. 376b77b9231SDan McDonald */ 377b77b9231SDan McDonald static int 3783f7978d0SAlan Somers zvol_replay_truncate(void *arg1, void *arg2, boolean_t byteswap) 379b77b9231SDan McDonald { 3803f7978d0SAlan Somers zvol_state_t *zv = arg1; 3813f7978d0SAlan Somers lr_truncate_t *lr = arg2; 382b77b9231SDan McDonald uint64_t offset, length; 383b77b9231SDan McDonald 384b77b9231SDan McDonald if (byteswap) 385b77b9231SDan McDonald byteswap_uint64_array(lr, sizeof (*lr)); 386b77b9231SDan McDonald 387b77b9231SDan McDonald offset = lr->lr_offset; 388b77b9231SDan McDonald length = lr->lr_length; 389b77b9231SDan McDonald 390b77b9231SDan McDonald return (dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, offset, length)); 391b77b9231SDan McDonald } 392b77b9231SDan McDonald 39322ac5be4Sperrin /* 39422ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 39522ac5be4Sperrin * after a system failure 39622ac5be4Sperrin */ 397eb633035STom Caputi /* ARGSUSED */ 39822ac5be4Sperrin static int 3993f7978d0SAlan Somers zvol_replay_write(void *arg1, void *arg2, boolean_t byteswap) 40022ac5be4Sperrin { 4013f7978d0SAlan Somers zvol_state_t *zv = arg1; 4023f7978d0SAlan Somers lr_write_t *lr = arg2; 40322ac5be4Sperrin objset_t *os = zv->zv_objset; 40422ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 405b24ab676SJeff Bonwick uint64_t offset, length; 40622ac5be4Sperrin dmu_tx_t *tx; 40722ac5be4Sperrin int error; 40822ac5be4Sperrin 40922ac5be4Sperrin if (byteswap) 41022ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 41122ac5be4Sperrin 412b24ab676SJeff Bonwick offset = lr->lr_offset; 413b24ab676SJeff Bonwick length = lr->lr_length; 414b24ab676SJeff Bonwick 415b24ab676SJeff Bonwick /* If it's a dmu_sync() block, write the whole block */ 416b24ab676SJeff Bonwick if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 417b24ab676SJeff Bonwick uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 418b24ab676SJeff Bonwick if (length < blocksize) { 419b24ab676SJeff Bonwick offset -= offset % blocksize; 420b24ab676SJeff Bonwick length = blocksize; 421b24ab676SJeff Bonwick } 422b24ab676SJeff Bonwick } 423975c32a0SNeil Perrin 42422ac5be4Sperrin tx = dmu_tx_create(os); 425b24ab676SJeff Bonwick dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 4261209a471SNeil Perrin error = dmu_tx_assign(tx, TXG_WAIT); 42722ac5be4Sperrin if (error) { 42822ac5be4Sperrin dmu_tx_abort(tx); 42922ac5be4Sperrin } else { 430b24ab676SJeff Bonwick dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 43122ac5be4Sperrin dmu_tx_commit(tx); 43222ac5be4Sperrin } 43322ac5be4Sperrin 43422ac5be4Sperrin return (error); 43522ac5be4Sperrin } 43622ac5be4Sperrin 43722ac5be4Sperrin /* ARGSUSED */ 43822ac5be4Sperrin static int 4393f7978d0SAlan Somers zvol_replay_err(void *arg1, void *arg2, boolean_t byteswap) 44022ac5be4Sperrin { 441be6fd75aSMatthew Ahrens return (SET_ERROR(ENOTSUP)); 44222ac5be4Sperrin } 44322ac5be4Sperrin 44422ac5be4Sperrin /* 44522ac5be4Sperrin * Callback vectors for replaying records. 446b77b9231SDan McDonald * Only TX_WRITE and TX_TRUNCATE are needed for zvol. 44722ac5be4Sperrin */ 44822ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 44922ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 45022ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 45122ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 45222ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 45322ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 45422ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 45522ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 45622ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 45722ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 45822ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 459b77b9231SDan McDonald zvol_replay_truncate, /* TX_TRUNCATE */ 46022ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 46122ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 462975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL */ 463975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ATTR */ 464975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 465975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL */ 466975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ATTR */ 467975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 468975c32a0SNeil Perrin zvol_replay_err, /* TX_WRITE2 */ 46922ac5be4Sperrin }; 47022ac5be4Sperrin 471681d9761SEric Taylor int 472681d9761SEric Taylor zvol_name2minor(const char *name, minor_t *minor) 473681d9761SEric Taylor { 474681d9761SEric Taylor zvol_state_t *zv; 475681d9761SEric Taylor 476c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 477681d9761SEric Taylor zv = zvol_minor_lookup(name); 478681d9761SEric Taylor if (minor && zv) 479681d9761SEric Taylor *minor = zv->zv_minor; 480c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 481681d9761SEric Taylor return (zv ? 0 : -1); 482681d9761SEric Taylor } 483681d9761SEric Taylor 484e7cbe64fSgw /* 485e7cbe64fSgw * Create a minor node (plus a whole lot more) for the specified volume. 486fa9e4066Sahrens */ 487fa9e4066Sahrens int 488681d9761SEric Taylor zvol_create_minor(const char *name) 489fa9e4066Sahrens { 490c99e4bdcSChris Kirby zfs_soft_state_t *zs; 491fa9e4066Sahrens zvol_state_t *zv; 492fa9e4066Sahrens objset_t *os; 49367bd71c6Sperrin dmu_object_info_t doi; 494fa9e4066Sahrens minor_t minor = 0; 495fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 496fa9e4066Sahrens int error; 497fa9e4066Sahrens 498c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 499fa9e4066Sahrens 5001195e687SMark J Musante if (zvol_minor_lookup(name) != NULL) { 501c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 502be6fd75aSMatthew Ahrens return (SET_ERROR(EEXIST)); 503fa9e4066Sahrens } 504fa9e4066Sahrens 505503ad85cSMatthew Ahrens /* lie and say we're read-only */ 506eb633035STom Caputi error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, B_TRUE, FTAG, &os); 507fa9e4066Sahrens 508fa9e4066Sahrens if (error) { 509c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 510fa9e4066Sahrens return (error); 511fa9e4066Sahrens } 512fa9e4066Sahrens 513c99e4bdcSChris Kirby if ((minor = zfsdev_minor_alloc()) == 0) { 514eb633035STom Caputi dmu_objset_disown(os, 1, FTAG); 515c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 516be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 517fa9e4066Sahrens } 518fa9e4066Sahrens 519c99e4bdcSChris Kirby if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 520eb633035STom Caputi dmu_objset_disown(os, 1, FTAG); 521c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 522be6fd75aSMatthew Ahrens return (SET_ERROR(EAGAIN)); 523fa9e4066Sahrens } 524e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 525e9dbad6fSeschrock (char *)name); 526fa9e4066Sahrens 527681d9761SEric Taylor (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 528fa9e4066Sahrens 529fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 530fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 531c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 532eb633035STom Caputi dmu_objset_disown(os, 1, FTAG); 533c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 534be6fd75aSMatthew Ahrens return (SET_ERROR(EAGAIN)); 535fa9e4066Sahrens } 536fa9e4066Sahrens 537681d9761SEric Taylor (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 538fa9e4066Sahrens 539fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 540fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 541fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 542c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 543eb633035STom Caputi dmu_objset_disown(os, 1, FTAG); 544c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 545be6fd75aSMatthew Ahrens return (SET_ERROR(EAGAIN)); 546fa9e4066Sahrens } 547fa9e4066Sahrens 548c99e4bdcSChris Kirby zs = ddi_get_soft_state(zfsdev_state, minor); 549c99e4bdcSChris Kirby zs->zss_type = ZSST_ZVOL; 550c99e4bdcSChris Kirby zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 551681d9761SEric Taylor (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 552fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 553fa9e4066Sahrens zv->zv_minor = minor; 554fa9e4066Sahrens zv->zv_objset = os; 555f9af39baSGeorge Wilson if (dmu_objset_is_snapshot(os) || !spa_writeable(dmu_objset_spa(os))) 556681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 55779315247SMatthew Ahrens rangelock_init(&zv->zv_rangelock, NULL, NULL); 55888b7b0f2SMatthew Ahrens list_create(&zv->zv_extents, sizeof (zvol_extent_t), 55988b7b0f2SMatthew Ahrens offsetof(zvol_extent_t, ze_node)); 56067bd71c6Sperrin /* get and cache the blocksize */ 56167bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 56267bd71c6Sperrin ASSERT(error == 0); 56367bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 56422ac5be4Sperrin 565f9af39baSGeorge Wilson if (spa_writeable(dmu_objset_spa(os))) { 566f9af39baSGeorge Wilson if (zil_replay_disable) 567f9af39baSGeorge Wilson zil_destroy(dmu_objset_zil(os), B_FALSE); 568f9af39baSGeorge Wilson else 569f9af39baSGeorge Wilson zil_replay(os, zv, zvol_replay_vector); 570f9af39baSGeorge Wilson } 571eb633035STom Caputi dmu_objset_disown(os, 1, FTAG); 572681d9761SEric Taylor zv->zv_objset = NULL; 573fa9e4066Sahrens 574fa9e4066Sahrens zvol_minors++; 575fa9e4066Sahrens 576c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 577fa9e4066Sahrens 578fa9e4066Sahrens return (0); 579fa9e4066Sahrens } 580fa9e4066Sahrens 581fa9e4066Sahrens /* 582fa9e4066Sahrens * Remove minor node for the specified volume. 583fa9e4066Sahrens */ 584681d9761SEric Taylor static int 585681d9761SEric Taylor zvol_remove_zv(zvol_state_t *zv) 586681d9761SEric Taylor { 587681d9761SEric Taylor char nmbuf[20]; 588c99e4bdcSChris Kirby minor_t minor = zv->zv_minor; 589681d9761SEric Taylor 590c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 591681d9761SEric Taylor if (zv->zv_total_opens != 0) 592be6fd75aSMatthew Ahrens return (SET_ERROR(EBUSY)); 593681d9761SEric Taylor 594c99e4bdcSChris Kirby (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 595681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 596681d9761SEric Taylor 597c99e4bdcSChris Kirby (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 598681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 599681d9761SEric Taylor 60079315247SMatthew Ahrens rangelock_fini(&zv->zv_rangelock); 601681d9761SEric Taylor 602c99e4bdcSChris Kirby kmem_free(zv, sizeof (zvol_state_t)); 603c99e4bdcSChris Kirby 604c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 605681d9761SEric Taylor 606681d9761SEric Taylor zvol_minors--; 607681d9761SEric Taylor return (0); 608681d9761SEric Taylor } 609681d9761SEric Taylor 610fa9e4066Sahrens int 611e9dbad6fSeschrock zvol_remove_minor(const char *name) 612fa9e4066Sahrens { 613fa9e4066Sahrens zvol_state_t *zv; 614681d9761SEric Taylor int rc; 615fa9e4066Sahrens 616c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 617e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 618c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 619be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 620fa9e4066Sahrens } 621681d9761SEric Taylor rc = zvol_remove_zv(zv); 622c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 623681d9761SEric Taylor return (rc); 624681d9761SEric Taylor } 625fa9e4066Sahrens 626681d9761SEric Taylor int 6278bf394f1STom Caputi zvol_first_open(zvol_state_t *zv, boolean_t rdonly) 628681d9761SEric Taylor { 629681d9761SEric Taylor objset_t *os; 630681d9761SEric Taylor uint64_t volsize; 631681d9761SEric Taylor int error; 632681d9761SEric Taylor uint64_t readonly; 6338bf394f1STom Caputi boolean_t ro; 634fa9e4066Sahrens 6358bf394f1STom Caputi ro = (rdonly || (strchr(zv->zv_name, '@') != NULL)); 6368bf394f1STom Caputi error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, ro, B_TRUE, zv, &os); 637681d9761SEric Taylor if (error) 638681d9761SEric Taylor return (error); 639fa9e4066Sahrens 640c61ea566SGeorge Wilson zv->zv_objset = os; 641681d9761SEric Taylor error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 642681d9761SEric Taylor if (error) { 643681d9761SEric Taylor ASSERT(error == 0); 644262af05aSJerry Jelinek dmu_objset_disown(os, 1, zv); 645681d9761SEric Taylor return (error); 646681d9761SEric Taylor } 647c61ea566SGeorge Wilson 6488dfe5547SRichard Yao error = dnode_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dn); 64994d1a210STim Haley if (error) { 650262af05aSJerry Jelinek dmu_objset_disown(os, 1, zv); 65194d1a210STim Haley return (error); 65294d1a210STim Haley } 653c61ea566SGeorge Wilson 654c61ea566SGeorge Wilson zvol_size_changed(zv, volsize); 655681d9761SEric Taylor zv->zv_zilog = zil_open(os, zvol_get_data); 656fa9e4066Sahrens 657681d9761SEric Taylor VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 658681d9761SEric Taylor NULL) == 0); 659f9af39baSGeorge Wilson if (readonly || dmu_objset_is_snapshot(os) || 660f9af39baSGeorge Wilson !spa_writeable(dmu_objset_spa(os))) 661681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 662681d9761SEric Taylor else 663681d9761SEric Taylor zv->zv_flags &= ~ZVOL_RDONLY; 664681d9761SEric Taylor return (error); 665681d9761SEric Taylor } 666fa9e4066Sahrens 667681d9761SEric Taylor void 668681d9761SEric Taylor zvol_last_close(zvol_state_t *zv) 669681d9761SEric Taylor { 67022ac5be4Sperrin zil_close(zv->zv_zilog); 67122ac5be4Sperrin zv->zv_zilog = NULL; 6722e2c1355SMatthew Ahrens 6738dfe5547SRichard Yao dnode_rele(zv->zv_dn, zvol_tag); 6748dfe5547SRichard Yao zv->zv_dn = NULL; 6752e2c1355SMatthew Ahrens 6762e2c1355SMatthew Ahrens /* 6772e2c1355SMatthew Ahrens * Evict cached data 6782e2c1355SMatthew Ahrens */ 6792e2c1355SMatthew Ahrens if (dsl_dataset_is_dirty(dmu_objset_ds(zv->zv_objset)) && 6802e2c1355SMatthew Ahrens !(zv->zv_flags & ZVOL_RDONLY)) 6812e2c1355SMatthew Ahrens txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 6823b2aab18SMatthew Ahrens dmu_objset_evict_dbufs(zv->zv_objset); 6832e2c1355SMatthew Ahrens 684262af05aSJerry Jelinek dmu_objset_disown(zv->zv_objset, 1, zv); 685fa9e4066Sahrens zv->zv_objset = NULL; 686fa9e4066Sahrens } 687fa9e4066Sahrens 688e7cbe64fSgw int 689e7cbe64fSgw zvol_prealloc(zvol_state_t *zv) 690e7cbe64fSgw { 691e7cbe64fSgw objset_t *os = zv->zv_objset; 692e7cbe64fSgw dmu_tx_t *tx; 693e7cbe64fSgw uint64_t refd, avail, usedobjs, availobjs; 694e7cbe64fSgw uint64_t resid = zv->zv_volsize; 695e7cbe64fSgw uint64_t off = 0; 696e7cbe64fSgw 697e7cbe64fSgw /* Check the space usage before attempting to allocate the space */ 698e7cbe64fSgw dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 699e7cbe64fSgw if (avail < zv->zv_volsize) 700be6fd75aSMatthew Ahrens return (SET_ERROR(ENOSPC)); 701e7cbe64fSgw 702e7cbe64fSgw /* Free old extents if they exist */ 703e7cbe64fSgw zvol_free_extents(zv); 704e7cbe64fSgw 705e7cbe64fSgw while (resid != 0) { 706e7cbe64fSgw int error; 707b5152584SMatthew Ahrens uint64_t bytes = MIN(resid, SPA_OLD_MAXBLOCKSIZE); 708e7cbe64fSgw 709e7cbe64fSgw tx = dmu_tx_create(os); 710e7cbe64fSgw dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 711e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 712e7cbe64fSgw if (error) { 713e7cbe64fSgw dmu_tx_abort(tx); 714cdb0ab79Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 715e7cbe64fSgw return (error); 716e7cbe64fSgw } 71782c9918fSTim Haley dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 718e7cbe64fSgw dmu_tx_commit(tx); 719e7cbe64fSgw off += bytes; 720e7cbe64fSgw resid -= bytes; 721e7cbe64fSgw } 722e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 723e7cbe64fSgw 724e7cbe64fSgw return (0); 725e7cbe64fSgw } 726e7cbe64fSgw 7273b2aab18SMatthew Ahrens static int 728681d9761SEric Taylor zvol_update_volsize(objset_t *os, uint64_t volsize) 729e7cbe64fSgw { 730e7cbe64fSgw dmu_tx_t *tx; 731e7cbe64fSgw int error; 732eb633035STom Caputi uint64_t txg; 733e7cbe64fSgw 734c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 735e7cbe64fSgw 736681d9761SEric Taylor tx = dmu_tx_create(os); 737e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 7384bb73804SMatthew Ahrens dmu_tx_mark_netfree(tx); 739e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 740e7cbe64fSgw if (error) { 741e7cbe64fSgw dmu_tx_abort(tx); 742e7cbe64fSgw return (error); 743e7cbe64fSgw } 744eb633035STom Caputi txg = dmu_tx_get_txg(tx); 745e7cbe64fSgw 746681d9761SEric Taylor error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 747e7cbe64fSgw &volsize, tx); 748e7cbe64fSgw dmu_tx_commit(tx); 749e7cbe64fSgw 750eb633035STom Caputi txg_wait_synced(dmu_objset_pool(os), txg); 751eb633035STom Caputi 752e7cbe64fSgw if (error == 0) 753681d9761SEric Taylor error = dmu_free_long_range(os, 754cdb0ab79Smaybee ZVOL_OBJ, volsize, DMU_OBJECT_END); 755681d9761SEric Taylor return (error); 756681d9761SEric Taylor } 757e7cbe64fSgw 758681d9761SEric Taylor void 759681d9761SEric Taylor zvol_remove_minors(const char *name) 760681d9761SEric Taylor { 761681d9761SEric Taylor zvol_state_t *zv; 762681d9761SEric Taylor char *namebuf; 763681d9761SEric Taylor minor_t minor; 764681d9761SEric Taylor 765681d9761SEric Taylor namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 766681d9761SEric Taylor (void) strncpy(namebuf, name, strlen(name)); 767681d9761SEric Taylor (void) strcat(namebuf, "/"); 768c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 769c99e4bdcSChris Kirby for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 770681d9761SEric Taylor 771c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 772681d9761SEric Taylor if (zv == NULL) 773681d9761SEric Taylor continue; 774681d9761SEric Taylor if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 775681d9761SEric Taylor (void) zvol_remove_zv(zv); 776e7cbe64fSgw } 777681d9761SEric Taylor kmem_free(namebuf, strlen(name) + 2); 778681d9761SEric Taylor 779c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 780e7cbe64fSgw } 781e7cbe64fSgw 782c61ea566SGeorge Wilson static int 7833b2aab18SMatthew Ahrens zvol_update_live_volsize(zvol_state_t *zv, uint64_t volsize) 784fa9e4066Sahrens { 785e7cbe64fSgw uint64_t old_volsize = 0ULL; 7863b2aab18SMatthew Ahrens int error = 0; 787fa9e4066Sahrens 788c61ea566SGeorge Wilson ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 789c61ea566SGeorge Wilson 790e7cbe64fSgw /* 791e7cbe64fSgw * Reinitialize the dump area to the new size. If we 792681d9761SEric Taylor * failed to resize the dump area then restore it back to 793c61ea566SGeorge Wilson * its original size. We must set the new volsize prior 794c61ea566SGeorge Wilson * to calling dumpvp_resize() to ensure that the devices' 795c61ea566SGeorge Wilson * size(9P) is not visible by the dump subsystem. 796e7cbe64fSgw */ 7973b2aab18SMatthew Ahrens old_volsize = zv->zv_volsize; 7983b2aab18SMatthew Ahrens zvol_size_changed(zv, volsize); 7993b2aab18SMatthew Ahrens 8003b2aab18SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 8013b2aab18SMatthew Ahrens if ((error = zvol_dumpify(zv)) != 0 || 8023b2aab18SMatthew Ahrens (error = dumpvp_resize()) != 0) { 8033b2aab18SMatthew Ahrens int dumpify_error; 8043b2aab18SMatthew Ahrens 8053b2aab18SMatthew Ahrens (void) zvol_update_volsize(zv->zv_objset, old_volsize); 8063b2aab18SMatthew Ahrens zvol_size_changed(zv, old_volsize); 8073b2aab18SMatthew Ahrens dumpify_error = zvol_dumpify(zv); 8083b2aab18SMatthew Ahrens error = dumpify_error ? dumpify_error : error; 809681d9761SEric Taylor } 810fa9e4066Sahrens } 811fa9e4066Sahrens 812573ca77eSGeorge Wilson /* 813573ca77eSGeorge Wilson * Generate a LUN expansion event. 814573ca77eSGeorge Wilson */ 8153b2aab18SMatthew Ahrens if (error == 0) { 816573ca77eSGeorge Wilson sysevent_id_t eid; 817573ca77eSGeorge Wilson nvlist_t *attr; 818573ca77eSGeorge Wilson char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 819573ca77eSGeorge Wilson 820681d9761SEric Taylor (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 821573ca77eSGeorge Wilson zv->zv_minor); 822573ca77eSGeorge Wilson 823573ca77eSGeorge Wilson VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 824573ca77eSGeorge Wilson VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 825573ca77eSGeorge Wilson 826573ca77eSGeorge Wilson (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 827573ca77eSGeorge Wilson ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 828573ca77eSGeorge Wilson 829573ca77eSGeorge Wilson nvlist_free(attr); 830573ca77eSGeorge Wilson kmem_free(physpath, MAXPATHLEN); 831573ca77eSGeorge Wilson } 832c61ea566SGeorge Wilson return (error); 833c61ea566SGeorge Wilson } 834573ca77eSGeorge Wilson 835c61ea566SGeorge Wilson int 836c61ea566SGeorge Wilson zvol_set_volsize(const char *name, uint64_t volsize) 837c61ea566SGeorge Wilson { 838c61ea566SGeorge Wilson zvol_state_t *zv = NULL; 839c61ea566SGeorge Wilson objset_t *os; 840c61ea566SGeorge Wilson int error; 841c61ea566SGeorge Wilson dmu_object_info_t doi; 842c61ea566SGeorge Wilson uint64_t readonly; 8433b2aab18SMatthew Ahrens boolean_t owned = B_FALSE; 8443b2aab18SMatthew Ahrens 8453b2aab18SMatthew Ahrens error = dsl_prop_get_integer(name, 8463b2aab18SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_READONLY), &readonly, NULL); 8473b2aab18SMatthew Ahrens if (error != 0) 8483b2aab18SMatthew Ahrens return (error); 8493b2aab18SMatthew Ahrens if (readonly) 850be6fd75aSMatthew Ahrens return (SET_ERROR(EROFS)); 851c61ea566SGeorge Wilson 852c61ea566SGeorge Wilson mutex_enter(&zfsdev_state_lock); 853c61ea566SGeorge Wilson zv = zvol_minor_lookup(name); 8543b2aab18SMatthew Ahrens 8553b2aab18SMatthew Ahrens if (zv == NULL || zv->zv_objset == NULL) { 856eb633035STom Caputi if ((error = dmu_objset_own(name, DMU_OST_ZVOL, B_FALSE, B_TRUE, 8573b2aab18SMatthew Ahrens FTAG, &os)) != 0) { 8583b2aab18SMatthew Ahrens mutex_exit(&zfsdev_state_lock); 8593b2aab18SMatthew Ahrens return (error); 8603b2aab18SMatthew Ahrens } 8613b2aab18SMatthew Ahrens owned = B_TRUE; 8623b2aab18SMatthew Ahrens if (zv != NULL) 8633b2aab18SMatthew Ahrens zv->zv_objset = os; 8643b2aab18SMatthew Ahrens } else { 8653b2aab18SMatthew Ahrens os = zv->zv_objset; 866c61ea566SGeorge Wilson } 867c61ea566SGeorge Wilson 868c61ea566SGeorge Wilson if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 8693b2aab18SMatthew Ahrens (error = zvol_check_volsize(volsize, doi.doi_data_block_size)) != 0) 870c61ea566SGeorge Wilson goto out; 871c61ea566SGeorge Wilson 8723b2aab18SMatthew Ahrens error = zvol_update_volsize(os, volsize); 873c61ea566SGeorge Wilson 8743b2aab18SMatthew Ahrens if (error == 0 && zv != NULL) 8753b2aab18SMatthew Ahrens error = zvol_update_live_volsize(zv, volsize); 876bb0ade09Sahrens out: 8773b2aab18SMatthew Ahrens if (owned) { 878eb633035STom Caputi dmu_objset_disown(os, B_TRUE, FTAG); 8793b2aab18SMatthew Ahrens if (zv != NULL) 8803b2aab18SMatthew Ahrens zv->zv_objset = NULL; 8813b2aab18SMatthew Ahrens } 882c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 883fa9e4066Sahrens return (error); 884fa9e4066Sahrens } 885fa9e4066Sahrens 886fa9e4066Sahrens /*ARGSUSED*/ 887fa9e4066Sahrens int 888fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 889fa9e4066Sahrens { 890fa9e4066Sahrens zvol_state_t *zv; 891681d9761SEric Taylor int err = 0; 892fa9e4066Sahrens 893c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 894fa9e4066Sahrens 895c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 896fa9e4066Sahrens if (zv == NULL) { 897c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 898be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 899fa9e4066Sahrens } 900fa9e4066Sahrens 901681d9761SEric Taylor if (zv->zv_total_opens == 0) 9028bf394f1STom Caputi err = zvol_first_open(zv, !(flag & FWRITE)); 903681d9761SEric Taylor if (err) { 904c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 905681d9761SEric Taylor return (err); 906681d9761SEric Taylor } 9078bf394f1STom Caputi 9088bf394f1STom Caputi if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 909be6fd75aSMatthew Ahrens err = SET_ERROR(EROFS); 910681d9761SEric Taylor goto out; 911fa9e4066Sahrens } 912c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 913be6fd75aSMatthew Ahrens err = SET_ERROR(EBUSY); 914681d9761SEric Taylor goto out; 915c7f714e2SEric Taylor } 916c7f714e2SEric Taylor if (flag & FEXCL) { 917c7f714e2SEric Taylor if (zv->zv_total_opens != 0) { 918be6fd75aSMatthew Ahrens err = SET_ERROR(EBUSY); 919681d9761SEric Taylor goto out; 920c7f714e2SEric Taylor } 921c7f714e2SEric Taylor zv->zv_flags |= ZVOL_EXCL; 922c7f714e2SEric Taylor } 923fa9e4066Sahrens 924fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 925fa9e4066Sahrens zv->zv_open_count[otyp]++; 926fa9e4066Sahrens zv->zv_total_opens++; 927fa9e4066Sahrens } 928c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 929fa9e4066Sahrens 930681d9761SEric Taylor return (err); 931681d9761SEric Taylor out: 932681d9761SEric Taylor if (zv->zv_total_opens == 0) 933681d9761SEric Taylor zvol_last_close(zv); 934c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 935681d9761SEric Taylor return (err); 936fa9e4066Sahrens } 937fa9e4066Sahrens 938fa9e4066Sahrens /*ARGSUSED*/ 939fa9e4066Sahrens int 940fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 941fa9e4066Sahrens { 942fa9e4066Sahrens minor_t minor = getminor(dev); 943fa9e4066Sahrens zvol_state_t *zv; 944681d9761SEric Taylor int error = 0; 945fa9e4066Sahrens 946c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 947fa9e4066Sahrens 948c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 949fa9e4066Sahrens if (zv == NULL) { 950c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 951be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 952fa9e4066Sahrens } 953fa9e4066Sahrens 954c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 955c7f714e2SEric Taylor ASSERT(zv->zv_total_opens == 1); 956c7f714e2SEric Taylor zv->zv_flags &= ~ZVOL_EXCL; 957fa9e4066Sahrens } 958fa9e4066Sahrens 959fa9e4066Sahrens /* 960fa9e4066Sahrens * If the open count is zero, this is a spurious close. 961fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 962fa9e4066Sahrens */ 963fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 964fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 965fa9e4066Sahrens 966fa9e4066Sahrens /* 967fa9e4066Sahrens * You may get multiple opens, but only one close. 968fa9e4066Sahrens */ 969fa9e4066Sahrens zv->zv_open_count[otyp]--; 970fa9e4066Sahrens zv->zv_total_opens--; 971fa9e4066Sahrens 972681d9761SEric Taylor if (zv->zv_total_opens == 0) 973681d9761SEric Taylor zvol_last_close(zv); 974fa9e4066Sahrens 975c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 976681d9761SEric Taylor return (error); 977fa9e4066Sahrens } 978fa9e4066Sahrens 979cab3a55eSPrakash Surya /* ARGSUSED */ 980feb08c6bSbillm static void 981b24ab676SJeff Bonwick zvol_get_done(zgd_t *zgd, int error) 98267bd71c6Sperrin { 983b24ab676SJeff Bonwick if (zgd->zgd_db) 984b24ab676SJeff Bonwick dmu_buf_rele(zgd->zgd_db, zgd); 985b24ab676SJeff Bonwick 98679315247SMatthew Ahrens rangelock_exit(zgd->zgd_lr); 987b24ab676SJeff Bonwick 98867bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 98967bd71c6Sperrin } 99067bd71c6Sperrin 99167bd71c6Sperrin /* 99267bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 99367bd71c6Sperrin */ 994feb08c6bSbillm static int 9951271e4b1SPrakash Surya zvol_get_data(void *arg, lr_write_t *lr, char *buf, struct lwb *lwb, zio_t *zio) 99667bd71c6Sperrin { 99767bd71c6Sperrin zvol_state_t *zv = arg; 998b24ab676SJeff Bonwick uint64_t offset = lr->lr_offset; 999b24ab676SJeff Bonwick uint64_t size = lr->lr_length; /* length of user data */ 100067bd71c6Sperrin dmu_buf_t *db; 100167bd71c6Sperrin zgd_t *zgd; 100267bd71c6Sperrin int error; 100367bd71c6Sperrin 10041271e4b1SPrakash Surya ASSERT3P(lwb, !=, NULL); 10051271e4b1SPrakash Surya ASSERT3P(zio, !=, NULL); 10061271e4b1SPrakash Surya ASSERT3U(size, !=, 0); 1007b24ab676SJeff Bonwick 1008b24ab676SJeff Bonwick zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 10091271e4b1SPrakash Surya zgd->zgd_lwb = lwb; 1010feb08c6bSbillm 1011c2e6a7d6Sperrin /* 1012c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 1013c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 1014c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 1015c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 1016c2e6a7d6Sperrin * we don't have to write the data twice. 1017c2e6a7d6Sperrin */ 101842b14111SLOLi if (buf != NULL) { /* immediate write */ 101979315247SMatthew Ahrens zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 102042b14111SLOLi RL_READER); 10218dfe5547SRichard Yao error = dmu_read_by_dnode(zv->zv_dn, offset, size, buf, 1022b24ab676SJeff Bonwick DMU_READ_NO_PREFETCH); 102342b14111SLOLi } else { /* indirect write */ 102442b14111SLOLi /* 102542b14111SLOLi * Have to lock the whole block to ensure when it's written out 102642b14111SLOLi * and its checksum is being calculated that no one can change 102742b14111SLOLi * the data. Contrarily to zfs_get_data we need not re-check 102842b14111SLOLi * blocksize after we get the lock because it cannot be changed. 102942b14111SLOLi */ 1030b24ab676SJeff Bonwick size = zv->zv_volblocksize; 1031b24ab676SJeff Bonwick offset = P2ALIGN(offset, size); 103279315247SMatthew Ahrens zgd->zgd_lr = rangelock_enter(&zv->zv_rangelock, offset, size, 103342b14111SLOLi RL_READER); 10348dfe5547SRichard Yao error = dmu_buf_hold_by_dnode(zv->zv_dn, offset, zgd, &db, 103547cb52daSJeff Bonwick DMU_READ_NO_PREFETCH); 1036b24ab676SJeff Bonwick if (error == 0) { 1037b7edcb94SMatthew Ahrens blkptr_t *bp = &lr->lr_blkptr; 103880901aeaSGeorge Wilson 1039b24ab676SJeff Bonwick zgd->zgd_db = db; 1040b24ab676SJeff Bonwick zgd->zgd_bp = bp; 104167bd71c6Sperrin 1042b24ab676SJeff Bonwick ASSERT(db->db_offset == offset); 1043b24ab676SJeff Bonwick ASSERT(db->db_size == size); 104467bd71c6Sperrin 1045b24ab676SJeff Bonwick error = dmu_sync(zio, lr->lr_common.lrc_txg, 1046b24ab676SJeff Bonwick zvol_get_done, zgd); 1047975c32a0SNeil Perrin 1048b24ab676SJeff Bonwick if (error == 0) 1049b24ab676SJeff Bonwick return (0); 1050b24ab676SJeff Bonwick } 1051975c32a0SNeil Perrin } 1052975c32a0SNeil Perrin 1053b24ab676SJeff Bonwick zvol_get_done(zgd, error); 1054b24ab676SJeff Bonwick 105567bd71c6Sperrin return (error); 105667bd71c6Sperrin } 105767bd71c6Sperrin 1058a24e15ceSperrin /* 1059a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 106022ac5be4Sperrin * 106122ac5be4Sperrin * We store data in the log buffers if it's small enough. 106267bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 106322ac5be4Sperrin */ 106467bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 106522ac5be4Sperrin 1066feb08c6bSbillm static void 1067510b6c0eSNeil Perrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 1068510b6c0eSNeil Perrin boolean_t sync) 106922ac5be4Sperrin { 1070feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 10711209a471SNeil Perrin zilog_t *zilog = zv->zv_zilog; 1072c5ee4681SAlexander Motin itx_wr_state_t write_state; 1073510b6c0eSNeil Perrin 1074b24ab676SJeff Bonwick if (zil_replaying(zilog, tx)) 10751209a471SNeil Perrin return; 10761209a471SNeil Perrin 1077c5ee4681SAlexander Motin if (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 1078c5ee4681SAlexander Motin write_state = WR_INDIRECT; 1079c5ee4681SAlexander Motin else if (!spa_has_slogs(zilog->zl_spa) && 1080c5ee4681SAlexander Motin resid >= blocksize && blocksize > zvol_immediate_write_sz) 1081c5ee4681SAlexander Motin write_state = WR_INDIRECT; 1082c5ee4681SAlexander Motin else if (sync) 1083c5ee4681SAlexander Motin write_state = WR_COPIED; 1084c5ee4681SAlexander Motin else 1085c5ee4681SAlexander Motin write_state = WR_NEED_COPY; 1086feb08c6bSbillm 1087510b6c0eSNeil Perrin while (resid) { 1088510b6c0eSNeil Perrin itx_t *itx; 1089510b6c0eSNeil Perrin lr_write_t *lr; 1090c5ee4681SAlexander Motin itx_wr_state_t wr_state = write_state; 1091c5ee4681SAlexander Motin ssize_t len = resid; 1092c5ee4681SAlexander Motin 1093c5ee4681SAlexander Motin if (wr_state == WR_COPIED && resid > ZIL_MAX_COPIED_DATA) 1094c5ee4681SAlexander Motin wr_state = WR_NEED_COPY; 1095c5ee4681SAlexander Motin else if (wr_state == WR_INDIRECT) 1096c5ee4681SAlexander Motin len = MIN(blocksize - P2PHASE(off, blocksize), resid); 1097510b6c0eSNeil Perrin 1098510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1099c5ee4681SAlexander Motin (wr_state == WR_COPIED ? len : 0)); 1100feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 11018dfe5547SRichard Yao if (wr_state == WR_COPIED && dmu_read_by_dnode(zv->zv_dn, 11028dfe5547SRichard Yao off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1103b24ab676SJeff Bonwick zil_itx_destroy(itx); 1104510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1105510b6c0eSNeil Perrin lr = (lr_write_t *)&itx->itx_lr; 1106c5ee4681SAlexander Motin wr_state = WR_NEED_COPY; 1107510b6c0eSNeil Perrin } 1108510b6c0eSNeil Perrin 1109c5ee4681SAlexander Motin itx->itx_wr_state = wr_state; 1110feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 1111feb08c6bSbillm lr->lr_offset = off; 1112510b6c0eSNeil Perrin lr->lr_length = len; 1113b24ab676SJeff Bonwick lr->lr_blkoff = 0; 1114feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 1115feb08c6bSbillm 1116510b6c0eSNeil Perrin itx->itx_private = zv; 1117510b6c0eSNeil Perrin itx->itx_sync = sync; 1118510b6c0eSNeil Perrin 11195002558fSNeil Perrin zil_itx_assign(zilog, itx, tx); 1120510b6c0eSNeil Perrin 1121510b6c0eSNeil Perrin off += len; 1122510b6c0eSNeil Perrin resid -= len; 112322ac5be4Sperrin } 112422ac5be4Sperrin } 112522ac5be4Sperrin 112688b7b0f2SMatthew Ahrens static int 1127810e43b2SBill Pijewski zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t origoffset, 1128810e43b2SBill Pijewski uint64_t size, boolean_t doread, boolean_t isdump) 1129e7cbe64fSgw { 1130dc0bb255SEric Taylor if (doread && !vdev_readable(vd)) 1131be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 1132ac04831dSMike Gerdts if (!doread && !vdev_writeable(vd)) 1133ac04831dSMike Gerdts return (SET_ERROR(EIO)); 1134ac04831dSMike Gerdts if (vd->vdev_ops->vdev_op_dumpio == NULL) 1135be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 1136e7cbe64fSgw 1137ac04831dSMike Gerdts return (vd->vdev_ops->vdev_op_dumpio(vd, addr, size, 1138ac04831dSMike Gerdts offset, origoffset, doread, isdump)); 1139e7cbe64fSgw } 1140e7cbe64fSgw 114188b7b0f2SMatthew Ahrens static int 114288b7b0f2SMatthew Ahrens zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 114388b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1144e7cbe64fSgw { 1145e7cbe64fSgw vdev_t *vd; 1146e7cbe64fSgw int error; 114788b7b0f2SMatthew Ahrens zvol_extent_t *ze; 1148e7cbe64fSgw spa_t *spa = dmu_objset_spa(zv->zv_objset); 1149e7cbe64fSgw 115088b7b0f2SMatthew Ahrens /* Must be sector aligned, and not stradle a block boundary. */ 115188b7b0f2SMatthew Ahrens if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 115288b7b0f2SMatthew Ahrens P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1153be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 115488b7b0f2SMatthew Ahrens } 115588b7b0f2SMatthew Ahrens ASSERT(size <= zv->zv_volblocksize); 1156e7cbe64fSgw 115788b7b0f2SMatthew Ahrens /* Locate the extent this belongs to */ 115888b7b0f2SMatthew Ahrens ze = list_head(&zv->zv_extents); 115988b7b0f2SMatthew Ahrens while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 116088b7b0f2SMatthew Ahrens offset -= ze->ze_nblks * zv->zv_volblocksize; 116188b7b0f2SMatthew Ahrens ze = list_next(&zv->zv_extents, ze); 116288b7b0f2SMatthew Ahrens } 116324cc0e1cSGeorge Wilson 11643b2aab18SMatthew Ahrens if (ze == NULL) 1165be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 11663b2aab18SMatthew Ahrens 116724cc0e1cSGeorge Wilson if (!ddi_in_panic()) 116824cc0e1cSGeorge Wilson spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 116924cc0e1cSGeorge Wilson 117088b7b0f2SMatthew Ahrens vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 117188b7b0f2SMatthew Ahrens offset += DVA_GET_OFFSET(&ze->ze_dva); 1172810e43b2SBill Pijewski error = zvol_dumpio_vdev(vd, addr, offset, DVA_GET_OFFSET(&ze->ze_dva), 1173810e43b2SBill Pijewski size, doread, isdump); 117424cc0e1cSGeorge Wilson 117524cc0e1cSGeorge Wilson if (!ddi_in_panic()) 117624cc0e1cSGeorge Wilson spa_config_exit(spa, SCL_STATE, FTAG); 117724cc0e1cSGeorge Wilson 1178e7cbe64fSgw return (error); 1179e7cbe64fSgw } 1180e7cbe64fSgw 1181fa9e4066Sahrens int 1182fa9e4066Sahrens zvol_strategy(buf_t *bp) 1183fa9e4066Sahrens { 1184c99e4bdcSChris Kirby zfs_soft_state_t *zs = NULL; 1185c99e4bdcSChris Kirby zvol_state_t *zv; 1186fa9e4066Sahrens uint64_t off, volsize; 118788b7b0f2SMatthew Ahrens size_t resid; 1188fa9e4066Sahrens char *addr; 118922ac5be4Sperrin objset_t *os; 1190fa9e4066Sahrens int error = 0; 1191ac04831dSMike Gerdts boolean_t doread = !!(bp->b_flags & B_READ); 1192810e43b2SBill Pijewski boolean_t is_dumpified; 1193510b6c0eSNeil Perrin boolean_t sync; 1194fa9e4066Sahrens 1195c99e4bdcSChris Kirby if (getminor(bp->b_edev) == 0) { 1196be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL); 1197c99e4bdcSChris Kirby } else { 1198c99e4bdcSChris Kirby zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1199c99e4bdcSChris Kirby if (zs == NULL) 1200be6fd75aSMatthew Ahrens error = SET_ERROR(ENXIO); 1201c99e4bdcSChris Kirby else if (zs->zss_type != ZSST_ZVOL) 1202be6fd75aSMatthew Ahrens error = SET_ERROR(EINVAL); 1203fa9e4066Sahrens } 1204fa9e4066Sahrens 1205c99e4bdcSChris Kirby if (error) { 1206c99e4bdcSChris Kirby bioerror(bp, error); 1207fa9e4066Sahrens biodone(bp); 1208fa9e4066Sahrens return (0); 1209fa9e4066Sahrens } 1210fa9e4066Sahrens 1211c99e4bdcSChris Kirby zv = zs->zss_data; 1212c99e4bdcSChris Kirby 1213681d9761SEric Taylor if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1214fa9e4066Sahrens bioerror(bp, EROFS); 1215fa9e4066Sahrens biodone(bp); 1216fa9e4066Sahrens return (0); 1217fa9e4066Sahrens } 1218fa9e4066Sahrens 1219fa9e4066Sahrens off = ldbtob(bp->b_blkno); 1220fa9e4066Sahrens volsize = zv->zv_volsize; 1221fa9e4066Sahrens 122222ac5be4Sperrin os = zv->zv_objset; 122322ac5be4Sperrin ASSERT(os != NULL); 1224fa9e4066Sahrens 1225fa9e4066Sahrens bp_mapin(bp); 1226fa9e4066Sahrens addr = bp->b_un.b_addr; 1227fa9e4066Sahrens resid = bp->b_bcount; 1228fa9e4066Sahrens 122988b7b0f2SMatthew Ahrens if (resid > 0 && (off < 0 || off >= volsize)) { 123088b7b0f2SMatthew Ahrens bioerror(bp, EIO); 123188b7b0f2SMatthew Ahrens biodone(bp); 123288b7b0f2SMatthew Ahrens return (0); 123388b7b0f2SMatthew Ahrens } 123473ec3d9cSgw 1235810e43b2SBill Pijewski is_dumpified = zv->zv_flags & ZVOL_DUMPIFIED; 123655da60b9SMark J Musante sync = ((!(bp->b_flags & B_ASYNC) && 123755da60b9SMark J Musante !(zv->zv_flags & ZVOL_WCE)) || 123855da60b9SMark J Musante (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 1239810e43b2SBill Pijewski !doread && !is_dumpified; 1240510b6c0eSNeil Perrin 1241c3377ee9SJohn Levon smt_begin_unsafe(); 1242455e370cSJohn Levon 1243a24e15ceSperrin /* 1244a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 1245a24e15ceSperrin * we can't change the data whilst calculating the checksum. 1246a24e15ceSperrin */ 124779315247SMatthew Ahrens locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, off, resid, 124888b7b0f2SMatthew Ahrens doread ? RL_READER : RL_WRITER); 1249fa9e4066Sahrens 1250e7cbe64fSgw while (resid != 0 && off < volsize) { 125188b7b0f2SMatthew Ahrens size_t size = MIN(resid, zvol_maxphys); 1252810e43b2SBill Pijewski if (is_dumpified) { 1253e7cbe64fSgw size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 125488b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, off, size, 125588b7b0f2SMatthew Ahrens doread, B_FALSE); 125688b7b0f2SMatthew Ahrens } else if (doread) { 12577bfdf011SNeil Perrin error = dmu_read(os, ZVOL_OBJ, off, size, addr, 12587bfdf011SNeil Perrin DMU_READ_PREFETCH); 1259fa9e4066Sahrens } else { 126022ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 1261fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1262fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 1263fa9e4066Sahrens if (error) { 1264fa9e4066Sahrens dmu_tx_abort(tx); 1265fa9e4066Sahrens } else { 126622ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1267510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, size, sync); 1268fa9e4066Sahrens dmu_tx_commit(tx); 1269fa9e4066Sahrens } 1270fa9e4066Sahrens } 1271b87f3af3Sperrin if (error) { 1272b87f3af3Sperrin /* convert checksum errors into IO errors */ 1273b87f3af3Sperrin if (error == ECKSUM) 1274be6fd75aSMatthew Ahrens error = SET_ERROR(EIO); 1275fa9e4066Sahrens break; 1276b87f3af3Sperrin } 1277fa9e4066Sahrens off += size; 1278fa9e4066Sahrens addr += size; 1279fa9e4066Sahrens resid -= size; 1280fa9e4066Sahrens } 128179315247SMatthew Ahrens rangelock_exit(lr); 1282fa9e4066Sahrens 1283fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 1284fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 1285fa9e4066Sahrens 1286510b6c0eSNeil Perrin if (sync) 12875002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1288feb08c6bSbillm biodone(bp); 128922ac5be4Sperrin 1290c3377ee9SJohn Levon smt_end_unsafe(); 1291455e370cSJohn Levon 1292fa9e4066Sahrens return (0); 1293fa9e4066Sahrens } 1294fa9e4066Sahrens 129567bd71c6Sperrin /* 129667bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 129767bd71c6Sperrin * Using our own routine instead of the default minphys() 129867bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 129967bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 130067bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 130167bd71c6Sperrin * 56K on X86 and 128K on sparc). 130267bd71c6Sperrin */ 130367bd71c6Sperrin void 130467bd71c6Sperrin zvol_minphys(struct buf *bp) 130567bd71c6Sperrin { 130667bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 130767bd71c6Sperrin bp->b_bcount = zvol_maxphys; 130867bd71c6Sperrin } 130967bd71c6Sperrin 1310e7cbe64fSgw int 1311e7cbe64fSgw zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1312e7cbe64fSgw { 1313e7cbe64fSgw minor_t minor = getminor(dev); 1314e7cbe64fSgw zvol_state_t *zv; 1315e7cbe64fSgw int error = 0; 1316e7cbe64fSgw uint64_t size; 1317e7cbe64fSgw uint64_t boff; 1318e7cbe64fSgw uint64_t resid; 1319e7cbe64fSgw 1320c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1321e7cbe64fSgw if (zv == NULL) 1322be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 1323e7cbe64fSgw 13243b2aab18SMatthew Ahrens if ((zv->zv_flags & ZVOL_DUMPIFIED) == 0) 1325be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 13263b2aab18SMatthew Ahrens 1327e7cbe64fSgw boff = ldbtob(blkno); 1328e7cbe64fSgw resid = ldbtob(nblocks); 132988b7b0f2SMatthew Ahrens 133088b7b0f2SMatthew Ahrens VERIFY3U(boff + resid, <=, zv->zv_volsize); 133188b7b0f2SMatthew Ahrens 1332e7cbe64fSgw while (resid) { 1333e7cbe64fSgw size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 133488b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1335e7cbe64fSgw if (error) 1336e7cbe64fSgw break; 1337e7cbe64fSgw boff += size; 1338e7cbe64fSgw addr += size; 1339e7cbe64fSgw resid -= size; 1340e7cbe64fSgw } 1341e7cbe64fSgw 1342e7cbe64fSgw return (error); 1343e7cbe64fSgw } 1344e7cbe64fSgw 1345fa9e4066Sahrens /*ARGSUSED*/ 1346fa9e4066Sahrens int 1347feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1348fa9e4066Sahrens { 1349c7ca1008Sgw minor_t minor = getminor(dev); 1350c7ca1008Sgw zvol_state_t *zv; 135173ec3d9cSgw uint64_t volsize; 1352feb08c6bSbillm int error = 0; 1353fa9e4066Sahrens 1354c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1355c7ca1008Sgw if (zv == NULL) 1356be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 1357c7ca1008Sgw 135873ec3d9cSgw volsize = zv->zv_volsize; 135973ec3d9cSgw if (uio->uio_resid > 0 && 136073ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1361be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 136273ec3d9cSgw 136388b7b0f2SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 136488b7b0f2SMatthew Ahrens error = physio(zvol_strategy, NULL, dev, B_READ, 136588b7b0f2SMatthew Ahrens zvol_minphys, uio); 136688b7b0f2SMatthew Ahrens return (error); 136788b7b0f2SMatthew Ahrens } 136888b7b0f2SMatthew Ahrens 1369c3377ee9SJohn Levon smt_begin_unsafe(); 1370455e370cSJohn Levon 137179315247SMatthew Ahrens locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 137279315247SMatthew Ahrens uio->uio_loffset, uio->uio_resid, RL_READER); 137373ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1374feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1375fa9e4066Sahrens 137673ec3d9cSgw /* don't read past the end */ 137773ec3d9cSgw if (bytes > volsize - uio->uio_loffset) 137873ec3d9cSgw bytes = volsize - uio->uio_loffset; 137973ec3d9cSgw 1380feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1381b87f3af3Sperrin if (error) { 1382b87f3af3Sperrin /* convert checksum errors into IO errors */ 1383b87f3af3Sperrin if (error == ECKSUM) 1384be6fd75aSMatthew Ahrens error = SET_ERROR(EIO); 1385feb08c6bSbillm break; 1386b87f3af3Sperrin } 1387feb08c6bSbillm } 138879315247SMatthew Ahrens rangelock_exit(lr); 138979315247SMatthew Ahrens 1390c3377ee9SJohn Levon smt_end_unsafe(); 1391455e370cSJohn Levon 1392feb08c6bSbillm return (error); 1393fa9e4066Sahrens } 1394fa9e4066Sahrens 1395fa9e4066Sahrens /*ARGSUSED*/ 1396fa9e4066Sahrens int 1397feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1398fa9e4066Sahrens { 1399c7ca1008Sgw minor_t minor = getminor(dev); 1400c7ca1008Sgw zvol_state_t *zv; 140173ec3d9cSgw uint64_t volsize; 1402feb08c6bSbillm int error = 0; 1403510b6c0eSNeil Perrin boolean_t sync; 1404feb08c6bSbillm 1405c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1406c7ca1008Sgw if (zv == NULL) 1407be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 1408c7ca1008Sgw 140973ec3d9cSgw volsize = zv->zv_volsize; 141073ec3d9cSgw if (uio->uio_resid > 0 && 141173ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 1412be6fd75aSMatthew Ahrens return (SET_ERROR(EIO)); 141373ec3d9cSgw 1414e7cbe64fSgw if (zv->zv_flags & ZVOL_DUMPIFIED) { 1415e7cbe64fSgw error = physio(zvol_strategy, NULL, dev, B_WRITE, 1416e7cbe64fSgw zvol_minphys, uio); 1417e7cbe64fSgw return (error); 1418e7cbe64fSgw } 1419e7cbe64fSgw 1420c3377ee9SJohn Levon smt_begin_unsafe(); 1421455e370cSJohn Levon 142255da60b9SMark J Musante sync = !(zv->zv_flags & ZVOL_WCE) || 142355da60b9SMark J Musante (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1424510b6c0eSNeil Perrin 142579315247SMatthew Ahrens locked_range_t *lr = rangelock_enter(&zv->zv_rangelock, 142679315247SMatthew Ahrens uio->uio_loffset, uio->uio_resid, RL_WRITER); 142773ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1428feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1429feb08c6bSbillm uint64_t off = uio->uio_loffset; 1430feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 143173ec3d9cSgw 143273ec3d9cSgw if (bytes > volsize - off) /* don't write past the end */ 143373ec3d9cSgw bytes = volsize - off; 143473ec3d9cSgw 1435*25df42a1SMatthew Ahrens dmu_tx_hold_write_by_dnode(tx, zv->zv_dn, off, bytes); 1436feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 1437feb08c6bSbillm if (error) { 1438feb08c6bSbillm dmu_tx_abort(tx); 1439feb08c6bSbillm break; 1440feb08c6bSbillm } 14418dfe5547SRichard Yao error = dmu_write_uio_dnode(zv->zv_dn, uio, bytes, tx); 1442feb08c6bSbillm if (error == 0) 1443510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, bytes, sync); 1444feb08c6bSbillm dmu_tx_commit(tx); 1445feb08c6bSbillm 1446feb08c6bSbillm if (error) 1447feb08c6bSbillm break; 1448feb08c6bSbillm } 144979315247SMatthew Ahrens rangelock_exit(lr); 145079315247SMatthew Ahrens 1451510b6c0eSNeil Perrin if (sync) 14525002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1453455e370cSJohn Levon 1454c3377ee9SJohn Levon smt_end_unsafe(); 1455455e370cSJohn Levon 1456feb08c6bSbillm return (error); 1457fa9e4066Sahrens } 1458fa9e4066Sahrens 1459c7f714e2SEric Taylor int 1460c7f714e2SEric Taylor zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1461c7f714e2SEric Taylor { 1462c7f714e2SEric Taylor struct uuid uuid = EFI_RESERVED; 1463c7f714e2SEric Taylor efi_gpe_t gpe = { 0 }; 1464c7f714e2SEric Taylor uint32_t crc; 1465c7f714e2SEric Taylor dk_efi_t efi; 1466c7f714e2SEric Taylor int length; 1467c7f714e2SEric Taylor char *ptr; 1468c7f714e2SEric Taylor 1469c7f714e2SEric Taylor if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1470be6fd75aSMatthew Ahrens return (SET_ERROR(EFAULT)); 1471c7f714e2SEric Taylor ptr = (char *)(uintptr_t)efi.dki_data_64; 1472c7f714e2SEric Taylor length = efi.dki_length; 1473c7f714e2SEric Taylor /* 1474c7f714e2SEric Taylor * Some clients may attempt to request a PMBR for the 1475c7f714e2SEric Taylor * zvol. Currently this interface will return EINVAL to 1476c7f714e2SEric Taylor * such requests. These requests could be supported by 1477c7f714e2SEric Taylor * adding a check for lba == 0 and consing up an appropriate 1478c7f714e2SEric Taylor * PMBR. 1479c7f714e2SEric Taylor */ 1480c7f714e2SEric Taylor if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1481be6fd75aSMatthew Ahrens return (SET_ERROR(EINVAL)); 1482c7f714e2SEric Taylor 1483c7f714e2SEric Taylor gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1484c7f714e2SEric Taylor gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1485c7f714e2SEric Taylor UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1486c7f714e2SEric Taylor 1487c7f714e2SEric Taylor if (efi.dki_lba == 1) { 1488c7f714e2SEric Taylor efi_gpt_t gpt = { 0 }; 1489c7f714e2SEric Taylor 1490c7f714e2SEric Taylor gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1491c7f714e2SEric Taylor gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1492fd797736SJohn Levon gpt.efi_gpt_HeaderSize = LE_32(EFI_HEADER_SIZE); 1493c7f714e2SEric Taylor gpt.efi_gpt_MyLBA = LE_64(1ULL); 1494c7f714e2SEric Taylor gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1495c7f714e2SEric Taylor gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1496c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1497c7f714e2SEric Taylor gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1498c7f714e2SEric Taylor gpt.efi_gpt_SizeOfPartitionEntry = 1499c7f714e2SEric Taylor LE_32(sizeof (efi_gpe_t)); 1500c7f714e2SEric Taylor CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1501c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1502fd797736SJohn Levon CRC32(crc, &gpt, EFI_HEADER_SIZE, -1U, crc32_table); 1503c7f714e2SEric Taylor gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1504c7f714e2SEric Taylor if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1505c7f714e2SEric Taylor flag)) 1506be6fd75aSMatthew Ahrens return (SET_ERROR(EFAULT)); 1507c7f714e2SEric Taylor ptr += sizeof (gpt); 1508c7f714e2SEric Taylor length -= sizeof (gpt); 1509c7f714e2SEric Taylor } 1510c7f714e2SEric Taylor if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1511c7f714e2SEric Taylor length), flag)) 1512be6fd75aSMatthew Ahrens return (SET_ERROR(EFAULT)); 1513c7f714e2SEric Taylor return (0); 1514c7f714e2SEric Taylor } 1515c7f714e2SEric Taylor 15163fb517f7SJames Moore /* 15173fb517f7SJames Moore * BEGIN entry points to allow external callers access to the volume. 15183fb517f7SJames Moore */ 15193fb517f7SJames Moore /* 15203fb517f7SJames Moore * Return the volume parameters needed for access from an external caller. 15213fb517f7SJames Moore * These values are invariant as long as the volume is held open. 15223fb517f7SJames Moore */ 15233fb517f7SJames Moore int 15243fb517f7SJames Moore zvol_get_volume_params(minor_t minor, uint64_t *blksize, 15253fb517f7SJames Moore uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 15268dfe5547SRichard Yao void **rl_hdl, void **dnode_hdl) 15273fb517f7SJames Moore { 15283fb517f7SJames Moore zvol_state_t *zv; 15293fb517f7SJames Moore 1530c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1531c99e4bdcSChris Kirby if (zv == NULL) 1532be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 15333fb517f7SJames Moore if (zv->zv_flags & ZVOL_DUMPIFIED) 1534be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 15353fb517f7SJames Moore 15363fb517f7SJames Moore ASSERT(blksize && max_xfer_len && minor_hdl && 15378dfe5547SRichard Yao objset_hdl && zil_hdl && rl_hdl && dnode_hdl); 15383fb517f7SJames Moore 15393fb517f7SJames Moore *blksize = zv->zv_volblocksize; 15403fb517f7SJames Moore *max_xfer_len = (uint64_t)zvol_maxphys; 15413fb517f7SJames Moore *minor_hdl = zv; 15423fb517f7SJames Moore *objset_hdl = zv->zv_objset; 15433fb517f7SJames Moore *zil_hdl = zv->zv_zilog; 154479315247SMatthew Ahrens *rl_hdl = &zv->zv_rangelock; 15458dfe5547SRichard Yao *dnode_hdl = zv->zv_dn; 15463fb517f7SJames Moore return (0); 15473fb517f7SJames Moore } 15483fb517f7SJames Moore 15493fb517f7SJames Moore /* 15503fb517f7SJames Moore * Return the current volume size to an external caller. 15513fb517f7SJames Moore * The size can change while the volume is open. 15523fb517f7SJames Moore */ 15533fb517f7SJames Moore uint64_t 15543fb517f7SJames Moore zvol_get_volume_size(void *minor_hdl) 15553fb517f7SJames Moore { 15563fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 15573fb517f7SJames Moore 15583fb517f7SJames Moore return (zv->zv_volsize); 15593fb517f7SJames Moore } 15603fb517f7SJames Moore 15613fb517f7SJames Moore /* 15623fb517f7SJames Moore * Return the current WCE setting to an external caller. 15633fb517f7SJames Moore * The WCE setting can change while the volume is open. 15643fb517f7SJames Moore */ 15653fb517f7SJames Moore int 15663fb517f7SJames Moore zvol_get_volume_wce(void *minor_hdl) 15673fb517f7SJames Moore { 15683fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 15693fb517f7SJames Moore 15703fb517f7SJames Moore return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 15713fb517f7SJames Moore } 15723fb517f7SJames Moore 15733fb517f7SJames Moore /* 15743fb517f7SJames Moore * Entry point for external callers to zvol_log_write 15753fb517f7SJames Moore */ 15763fb517f7SJames Moore void 15773fb517f7SJames Moore zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 15783fb517f7SJames Moore boolean_t sync) 15793fb517f7SJames Moore { 15803fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 15813fb517f7SJames Moore 15823fb517f7SJames Moore zvol_log_write(zv, tx, off, resid, sync); 15833fb517f7SJames Moore } 15843fb517f7SJames Moore /* 15853fb517f7SJames Moore * END entry points to allow external callers access to the volume. 15863fb517f7SJames Moore */ 15873fb517f7SJames Moore 1588b77b9231SDan McDonald /* 1589b77b9231SDan McDonald * Log a DKIOCFREE/free-long-range to the ZIL with TX_TRUNCATE. 1590b77b9231SDan McDonald */ 1591b77b9231SDan McDonald static void 1592b77b9231SDan McDonald zvol_log_truncate(zvol_state_t *zv, dmu_tx_t *tx, uint64_t off, uint64_t len, 1593b77b9231SDan McDonald boolean_t sync) 1594b77b9231SDan McDonald { 1595b77b9231SDan McDonald itx_t *itx; 1596b77b9231SDan McDonald lr_truncate_t *lr; 1597b77b9231SDan McDonald zilog_t *zilog = zv->zv_zilog; 1598b77b9231SDan McDonald 1599b77b9231SDan McDonald if (zil_replaying(zilog, tx)) 1600b77b9231SDan McDonald return; 1601b77b9231SDan McDonald 1602b77b9231SDan McDonald itx = zil_itx_create(TX_TRUNCATE, sizeof (*lr)); 1603b77b9231SDan McDonald lr = (lr_truncate_t *)&itx->itx_lr; 1604b77b9231SDan McDonald lr->lr_foid = ZVOL_OBJ; 1605b77b9231SDan McDonald lr->lr_offset = off; 1606b77b9231SDan McDonald lr->lr_length = len; 1607b77b9231SDan McDonald 1608b77b9231SDan McDonald itx->itx_sync = sync; 1609b77b9231SDan McDonald zil_itx_assign(zilog, itx, tx); 1610b77b9231SDan McDonald } 1611b77b9231SDan McDonald 1612fa9e4066Sahrens /* 1613fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1614b77b9231SDan McDonald * Also a dirtbag dkio ioctl for unmap/free-block functionality. 1615fa9e4066Sahrens */ 1616fa9e4066Sahrens /*ARGSUSED*/ 1617fa9e4066Sahrens int 1618fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1619fa9e4066Sahrens { 1620fa9e4066Sahrens zvol_state_t *zv; 1621af2c4821Smaybee struct dk_callback *dkc; 1622efe44a03SJerry Jelinek int i, error = 0; 162379315247SMatthew Ahrens locked_range_t *lr; 1624fa9e4066Sahrens 1625c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 1626fa9e4066Sahrens 1627c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1628fa9e4066Sahrens 1629fa9e4066Sahrens if (zv == NULL) { 1630c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1631be6fd75aSMatthew Ahrens return (SET_ERROR(ENXIO)); 1632fa9e4066Sahrens } 1633701f66c4SEric Taylor ASSERT(zv->zv_total_opens > 0); 1634fa9e4066Sahrens 1635fa9e4066Sahrens switch (cmd) { 1636fa9e4066Sahrens 1637fa9e4066Sahrens case DKIOCINFO: 1638a0b60564SGeorge Wilson { 1639a0b60564SGeorge Wilson struct dk_cinfo dki; 1640a0b60564SGeorge Wilson 1641af2c4821Smaybee bzero(&dki, sizeof (dki)); 1642af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1643af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1644af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 16453adc9019SEric Taylor dki.dki_unit = getminor(dev); 1646b5152584SMatthew Ahrens dki.dki_maxtransfer = 1647b5152584SMatthew Ahrens 1 << (SPA_OLD_MAXBLOCKSHIFT - zv->zv_min_bs); 1648c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1649af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1650be6fd75aSMatthew Ahrens error = SET_ERROR(EFAULT); 1651fa9e4066Sahrens return (error); 1652a0b60564SGeorge Wilson } 1653fa9e4066Sahrens 1654fa9e4066Sahrens case DKIOCGMEDIAINFO: 1655a0b60564SGeorge Wilson { 1656a0b60564SGeorge Wilson struct dk_minfo dkm; 1657a0b60564SGeorge Wilson 1658fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1659fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1660fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1661fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1662c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1663fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1664be6fd75aSMatthew Ahrens error = SET_ERROR(EFAULT); 1665fa9e4066Sahrens return (error); 1666a0b60564SGeorge Wilson } 1667a0b60564SGeorge Wilson 1668a0b60564SGeorge Wilson case DKIOCGMEDIAINFOEXT: 1669a0b60564SGeorge Wilson { 1670a0b60564SGeorge Wilson struct dk_minfo_ext dkmext; 1671a0b60564SGeorge Wilson 1672a0b60564SGeorge Wilson bzero(&dkmext, sizeof (dkmext)); 1673a0b60564SGeorge Wilson dkmext.dki_lbsize = 1U << zv->zv_min_bs; 1674a0b60564SGeorge Wilson dkmext.dki_pbsize = zv->zv_volblocksize; 1675a0b60564SGeorge Wilson dkmext.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1676a0b60564SGeorge Wilson dkmext.dki_media_type = DK_UNKNOWN; 1677a0b60564SGeorge Wilson mutex_exit(&zfsdev_state_lock); 1678a0b60564SGeorge Wilson if (ddi_copyout(&dkmext, (void *)arg, sizeof (dkmext), flag)) 1679a0b60564SGeorge Wilson error = SET_ERROR(EFAULT); 1680a0b60564SGeorge Wilson return (error); 1681a0b60564SGeorge Wilson } 1682fa9e4066Sahrens 1683fa9e4066Sahrens case DKIOCGETEFI: 1684a0b60564SGeorge Wilson { 1685a0b60564SGeorge Wilson uint64_t vs = zv->zv_volsize; 1686a0b60564SGeorge Wilson uint8_t bs = zv->zv_min_bs; 1687fa9e4066Sahrens 1688a0b60564SGeorge Wilson mutex_exit(&zfsdev_state_lock); 1689a0b60564SGeorge Wilson error = zvol_getefi((void *)arg, flag, vs, bs); 1690a0b60564SGeorge Wilson return (error); 1691a0b60564SGeorge Wilson } 1692fa9e4066Sahrens 1693feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1694af2c4821Smaybee dkc = (struct dk_callback *)arg; 1695c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1696455e370cSJohn Levon 1697c3377ee9SJohn Levon smt_begin_unsafe(); 1698455e370cSJohn Levon 16995002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1700af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1701af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1702af2c4821Smaybee error = 0; 1703af2c4821Smaybee } 1704455e370cSJohn Levon 1705c3377ee9SJohn Levon smt_end_unsafe(); 1706455e370cSJohn Levon 1707701f66c4SEric Taylor return (error); 1708701f66c4SEric Taylor 1709701f66c4SEric Taylor case DKIOCGETWCE: 1710a0b60564SGeorge Wilson { 1711a0b60564SGeorge Wilson int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1712a0b60564SGeorge Wilson if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1713a0b60564SGeorge Wilson flag)) 1714a0b60564SGeorge Wilson error = SET_ERROR(EFAULT); 1715a0b60564SGeorge Wilson break; 1716a0b60564SGeorge Wilson } 1717a0b60564SGeorge Wilson case DKIOCSETWCE: 1718a0b60564SGeorge Wilson { 1719a0b60564SGeorge Wilson int wce; 1720a0b60564SGeorge Wilson if (ddi_copyin((void *)arg, &wce, sizeof (int), 1721a0b60564SGeorge Wilson flag)) { 1722a0b60564SGeorge Wilson error = SET_ERROR(EFAULT); 1723701f66c4SEric Taylor break; 1724701f66c4SEric Taylor } 1725a0b60564SGeorge Wilson if (wce) { 1726a0b60564SGeorge Wilson zv->zv_flags |= ZVOL_WCE; 1727a0b60564SGeorge Wilson mutex_exit(&zfsdev_state_lock); 1728a0b60564SGeorge Wilson } else { 1729a0b60564SGeorge Wilson zv->zv_flags &= ~ZVOL_WCE; 1730a0b60564SGeorge Wilson mutex_exit(&zfsdev_state_lock); 1731c3377ee9SJohn Levon smt_begin_unsafe(); 1732a0b60564SGeorge Wilson zil_commit(zv->zv_zilog, ZVOL_OBJ); 1733c3377ee9SJohn Levon smt_end_unsafe(); 1734701f66c4SEric Taylor } 1735a0b60564SGeorge Wilson return (0); 1736a0b60564SGeorge Wilson } 1737feb08c6bSbillm 1738b6130eadSmaybee case DKIOCGGEOM: 1739b6130eadSmaybee case DKIOCGVTOC: 1740e7cbe64fSgw /* 1741e7cbe64fSgw * commands using these (like prtvtoc) expect ENOTSUP 1742e7cbe64fSgw * since we're emulating an EFI label 1743e7cbe64fSgw */ 1744be6fd75aSMatthew Ahrens error = SET_ERROR(ENOTSUP); 1745b6130eadSmaybee break; 1746b6130eadSmaybee 1747e7cbe64fSgw case DKIOCDUMPINIT: 174879315247SMatthew Ahrens lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1749e7cbe64fSgw RL_WRITER); 1750e7cbe64fSgw error = zvol_dumpify(zv); 175179315247SMatthew Ahrens rangelock_exit(lr); 1752e7cbe64fSgw break; 1753e7cbe64fSgw 1754e7cbe64fSgw case DKIOCDUMPFINI: 175506d5ae10SEric Taylor if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 175606d5ae10SEric Taylor break; 175779315247SMatthew Ahrens lr = rangelock_enter(&zv->zv_rangelock, 0, zv->zv_volsize, 1758e7cbe64fSgw RL_WRITER); 1759e7cbe64fSgw error = zvol_dump_fini(zv); 176079315247SMatthew Ahrens rangelock_exit(lr); 1761e7cbe64fSgw break; 1762e7cbe64fSgw 1763b77b9231SDan McDonald case DKIOCFREE: 1764b77b9231SDan McDonald { 1765047c81d3SSaso Kiselkov dkioc_free_list_t *dfl; 1766b77b9231SDan McDonald dmu_tx_t *tx; 1767b77b9231SDan McDonald 1768893c83baSGeorge Wilson if (!zvol_unmap_enabled) 1769893c83baSGeorge Wilson break; 1770893c83baSGeorge Wilson 1771047c81d3SSaso Kiselkov if (!(flag & FKIOCTL)) { 1772047c81d3SSaso Kiselkov error = dfl_copyin((void *)arg, &dfl, flag, KM_SLEEP); 1773047c81d3SSaso Kiselkov if (error != 0) 1774047c81d3SSaso Kiselkov break; 1775047c81d3SSaso Kiselkov } else { 1776047c81d3SSaso Kiselkov dfl = (dkioc_free_list_t *)arg; 1777047c81d3SSaso Kiselkov ASSERT3U(dfl->dfl_num_exts, <=, DFL_COPYIN_MAX_EXTS); 1778047c81d3SSaso Kiselkov if (dfl->dfl_num_exts > DFL_COPYIN_MAX_EXTS) { 1779047c81d3SSaso Kiselkov error = SET_ERROR(EINVAL); 1780047c81d3SSaso Kiselkov break; 1781047c81d3SSaso Kiselkov } 1782b77b9231SDan McDonald } 1783b77b9231SDan McDonald 1784574e2414SGeorge Wilson mutex_exit(&zfsdev_state_lock); 1785b77b9231SDan McDonald 1786c3377ee9SJohn Levon smt_begin_unsafe(); 1787455e370cSJohn Levon 1788047c81d3SSaso Kiselkov for (int i = 0; i < dfl->dfl_num_exts; i++) { 1789047c81d3SSaso Kiselkov uint64_t start = dfl->dfl_exts[i].dfle_start, 1790047c81d3SSaso Kiselkov length = dfl->dfl_exts[i].dfle_length, 1791047c81d3SSaso Kiselkov end = start + length; 1792047c81d3SSaso Kiselkov 1793047c81d3SSaso Kiselkov /* 1794047c81d3SSaso Kiselkov * Apply Postel's Law to length-checking. If they 1795047c81d3SSaso Kiselkov * overshoot, just blank out until the end, if there's 1796047c81d3SSaso Kiselkov * a need to blank out anything. 1797047c81d3SSaso Kiselkov */ 1798047c81d3SSaso Kiselkov if (start >= zv->zv_volsize) 1799047c81d3SSaso Kiselkov continue; /* No need to do anything... */ 1800047c81d3SSaso Kiselkov if (end > zv->zv_volsize) { 1801047c81d3SSaso Kiselkov end = DMU_OBJECT_END; 1802047c81d3SSaso Kiselkov length = end - start; 1803047c81d3SSaso Kiselkov } 1804b77b9231SDan McDonald 180579315247SMatthew Ahrens lr = rangelock_enter(&zv->zv_rangelock, start, length, 1806047c81d3SSaso Kiselkov RL_WRITER); 1807047c81d3SSaso Kiselkov tx = dmu_tx_create(zv->zv_objset); 1808047c81d3SSaso Kiselkov error = dmu_tx_assign(tx, TXG_WAIT); 1809047c81d3SSaso Kiselkov if (error != 0) { 1810047c81d3SSaso Kiselkov dmu_tx_abort(tx); 1811047c81d3SSaso Kiselkov } else { 1812047c81d3SSaso Kiselkov zvol_log_truncate(zv, tx, start, length, 1813047c81d3SSaso Kiselkov B_TRUE); 1814047c81d3SSaso Kiselkov dmu_tx_commit(tx); 1815047c81d3SSaso Kiselkov error = dmu_free_long_range(zv->zv_objset, 1816047c81d3SSaso Kiselkov ZVOL_OBJ, start, length); 1817047c81d3SSaso Kiselkov } 1818047c81d3SSaso Kiselkov 181979315247SMatthew Ahrens rangelock_exit(lr); 1820047c81d3SSaso Kiselkov 1821047c81d3SSaso Kiselkov if (error != 0) 1822047c81d3SSaso Kiselkov break; 1823047c81d3SSaso Kiselkov } 1824b77b9231SDan McDonald 18251c9272b8SStephen Blinick /* 18261c9272b8SStephen Blinick * If the write-cache is disabled, 'sync' property 18271c9272b8SStephen Blinick * is set to 'always', or if the caller is asking for 18281c9272b8SStephen Blinick * a synchronous free, commit this operation to the zil. 18291c9272b8SStephen Blinick * This will sync any previous uncommitted writes to the 18301c9272b8SStephen Blinick * zvol object. 18311c9272b8SStephen Blinick * Can be overridden by the zvol_unmap_sync_enabled tunable. 18321c9272b8SStephen Blinick */ 18331c9272b8SStephen Blinick if ((error == 0) && zvol_unmap_sync_enabled && 18341c9272b8SStephen Blinick (!(zv->zv_flags & ZVOL_WCE) || 18351c9272b8SStephen Blinick (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS) || 1836047c81d3SSaso Kiselkov (dfl->dfl_flags & DF_WAIT_SYNC))) { 18371c9272b8SStephen Blinick zil_commit(zv->zv_zilog, ZVOL_OBJ); 1838b77b9231SDan McDonald } 18391c9272b8SStephen Blinick 1840047c81d3SSaso Kiselkov if (!(flag & FKIOCTL)) 1841047c81d3SSaso Kiselkov dfl_free(dfl); 1842047c81d3SSaso Kiselkov 1843c3377ee9SJohn Levon smt_end_unsafe(); 1844455e370cSJohn Levon 1845574e2414SGeorge Wilson return (error); 1846b77b9231SDan McDonald } 1847b77b9231SDan McDonald 1848efe44a03SJerry Jelinek case DKIOC_CANFREE: 1849efe44a03SJerry Jelinek i = zvol_unmap_enabled ? 1 : 0; 1850efe44a03SJerry Jelinek if (ddi_copyout(&i, (void *)arg, sizeof (int), flag) != 0) { 1851efe44a03SJerry Jelinek error = EFAULT; 1852efe44a03SJerry Jelinek } else { 1853efe44a03SJerry Jelinek error = 0; 1854efe44a03SJerry Jelinek } 1855efe44a03SJerry Jelinek break; 1856efe44a03SJerry Jelinek 1857fa9e4066Sahrens default: 1858be6fd75aSMatthew Ahrens error = SET_ERROR(ENOTTY); 1859fa9e4066Sahrens break; 1860fa9e4066Sahrens 1861fa9e4066Sahrens } 1862c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1863fa9e4066Sahrens return (error); 1864fa9e4066Sahrens } 1865fa9e4066Sahrens 1866fa9e4066Sahrens int 1867fa9e4066Sahrens zvol_busy(void) 1868fa9e4066Sahrens { 1869fa9e4066Sahrens return (zvol_minors != 0); 1870fa9e4066Sahrens } 1871fa9e4066Sahrens 1872fa9e4066Sahrens void 1873fa9e4066Sahrens zvol_init(void) 1874fa9e4066Sahrens { 1875c99e4bdcSChris Kirby VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1876c99e4bdcSChris Kirby 1) == 0); 1877c99e4bdcSChris Kirby mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1878fa9e4066Sahrens } 1879fa9e4066Sahrens 1880fa9e4066Sahrens void 1881fa9e4066Sahrens zvol_fini(void) 1882fa9e4066Sahrens { 1883c99e4bdcSChris Kirby mutex_destroy(&zfsdev_state_lock); 1884c99e4bdcSChris Kirby ddi_soft_state_fini(&zfsdev_state); 1885fa9e4066Sahrens } 1886e7cbe64fSgw 1887810e43b2SBill Pijewski /*ARGSUSED*/ 1888810e43b2SBill Pijewski static int 1889810e43b2SBill Pijewski zfs_mvdev_dump_feature_check(void *arg, dmu_tx_t *tx) 1890810e43b2SBill Pijewski { 1891810e43b2SBill Pijewski spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1892810e43b2SBill Pijewski 18932acef22dSMatthew Ahrens if (spa_feature_is_active(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1894810e43b2SBill Pijewski return (1); 1895810e43b2SBill Pijewski return (0); 1896810e43b2SBill Pijewski } 1897810e43b2SBill Pijewski 1898810e43b2SBill Pijewski /*ARGSUSED*/ 1899810e43b2SBill Pijewski static void 1900810e43b2SBill Pijewski zfs_mvdev_dump_activate_feature_sync(void *arg, dmu_tx_t *tx) 1901810e43b2SBill Pijewski { 1902810e43b2SBill Pijewski spa_t *spa = dmu_tx_pool(tx)->dp_spa; 1903810e43b2SBill Pijewski 19042acef22dSMatthew Ahrens spa_feature_incr(spa, SPA_FEATURE_MULTI_VDEV_CRASH_DUMP, tx); 1905810e43b2SBill Pijewski } 1906810e43b2SBill Pijewski 1907e7cbe64fSgw static int 1908e7cbe64fSgw zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1909e7cbe64fSgw { 1910e7cbe64fSgw dmu_tx_t *tx; 1911810e43b2SBill Pijewski int error; 1912e7cbe64fSgw objset_t *os = zv->zv_objset; 1913810e43b2SBill Pijewski spa_t *spa = dmu_objset_spa(os); 1914810e43b2SBill Pijewski vdev_t *vd = spa->spa_root_vdev; 1915e7cbe64fSgw nvlist_t *nv = NULL; 1916810e43b2SBill Pijewski uint64_t version = spa_version(spa); 1917b10bba72SGeorge Wilson uint64_t checksum, compress, refresrv, vbs, dedup; 1918e7cbe64fSgw 1919c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1920810e43b2SBill Pijewski ASSERT(vd->vdev_ops == &vdev_root_ops); 1921810e43b2SBill Pijewski 1922681d9761SEric Taylor error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1923681d9761SEric Taylor DMU_OBJECT_END); 1924b10bba72SGeorge Wilson if (error != 0) 1925b10bba72SGeorge Wilson return (error); 1926681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1927681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1928e7cbe64fSgw 1929810e43b2SBill Pijewski /* 1930810e43b2SBill Pijewski * If the pool on which the dump device is being initialized has more 1931810e43b2SBill Pijewski * than one child vdev, check that the MULTI_VDEV_CRASH_DUMP feature is 1932810e43b2SBill Pijewski * enabled. If so, bump that feature's counter to indicate that the 1933810e43b2SBill Pijewski * feature is active. We also check the vdev type to handle the 1934810e43b2SBill Pijewski * following case: 1935810e43b2SBill Pijewski * # zpool create test raidz disk1 disk2 disk3 1936810e43b2SBill Pijewski * Now have spa_root_vdev->vdev_children == 1 (the raidz vdev), 1937810e43b2SBill Pijewski * the raidz vdev itself has 3 children. 1938810e43b2SBill Pijewski */ 1939810e43b2SBill Pijewski if (vd->vdev_children > 1 || vd->vdev_ops == &vdev_raidz_ops) { 1940810e43b2SBill Pijewski if (!spa_feature_is_enabled(spa, 19412acef22dSMatthew Ahrens SPA_FEATURE_MULTI_VDEV_CRASH_DUMP)) 1942810e43b2SBill Pijewski return (SET_ERROR(ENOTSUP)); 1943810e43b2SBill Pijewski (void) dsl_sync_task(spa_name(spa), 1944810e43b2SBill Pijewski zfs_mvdev_dump_feature_check, 19457d46dc6cSMatthew Ahrens zfs_mvdev_dump_activate_feature_sync, NULL, 19467d46dc6cSMatthew Ahrens 2, ZFS_SPACE_CHECK_RESERVED); 1947810e43b2SBill Pijewski } 1948810e43b2SBill Pijewski 1949b10bba72SGeorge Wilson if (!resize) { 1950b10bba72SGeorge Wilson error = dsl_prop_get_integer(zv->zv_name, 1951b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1952b10bba72SGeorge Wilson if (error == 0) { 1953b10bba72SGeorge Wilson error = dsl_prop_get_integer(zv->zv_name, 1954b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, 1955b10bba72SGeorge Wilson NULL); 1956b10bba72SGeorge Wilson } 1957b10bba72SGeorge Wilson if (error == 0) { 1958b10bba72SGeorge Wilson error = dsl_prop_get_integer(zv->zv_name, 1959b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 1960b10bba72SGeorge Wilson &refresrv, NULL); 1961b10bba72SGeorge Wilson } 1962b10bba72SGeorge Wilson if (error == 0) { 1963b10bba72SGeorge Wilson error = dsl_prop_get_integer(zv->zv_name, 1964b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, 1965b10bba72SGeorge Wilson NULL); 1966b10bba72SGeorge Wilson } 1967b10bba72SGeorge Wilson if (version >= SPA_VERSION_DEDUP && error == 0) { 1968b10bba72SGeorge Wilson error = dsl_prop_get_integer(zv->zv_name, 1969b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 1970b10bba72SGeorge Wilson } 1971b10bba72SGeorge Wilson } 1972b10bba72SGeorge Wilson if (error != 0) 1973b10bba72SGeorge Wilson return (error); 1974b10bba72SGeorge Wilson 1975e7cbe64fSgw tx = dmu_tx_create(os); 1976e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1977681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1978e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1979b10bba72SGeorge Wilson if (error != 0) { 1980e7cbe64fSgw dmu_tx_abort(tx); 1981e7cbe64fSgw return (error); 1982e7cbe64fSgw } 1983e7cbe64fSgw 1984e7cbe64fSgw /* 1985e7cbe64fSgw * If we are resizing the dump device then we only need to 1986e7cbe64fSgw * update the refreservation to match the newly updated 1987e7cbe64fSgw * zvolsize. Otherwise, we save off the original state of the 1988e7cbe64fSgw * zvol so that we can restore them if the zvol is ever undumpified. 1989e7cbe64fSgw */ 1990e7cbe64fSgw if (resize) { 1991e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, 1992e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1993e7cbe64fSgw &zv->zv_volsize, tx); 1994e7cbe64fSgw } else { 1995b10bba72SGeorge Wilson error = zap_update(os, ZVOL_ZAP_OBJ, 1996e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1997e7cbe64fSgw &compress, tx); 1998b10bba72SGeorge Wilson if (error == 0) { 1999b10bba72SGeorge Wilson error = zap_update(os, ZVOL_ZAP_OBJ, 2000b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, 2001b10bba72SGeorge Wilson &checksum, tx); 2002b10bba72SGeorge Wilson } 2003b10bba72SGeorge Wilson if (error == 0) { 2004b10bba72SGeorge Wilson error = zap_update(os, ZVOL_ZAP_OBJ, 2005b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 2006b10bba72SGeorge Wilson &refresrv, tx); 2007b10bba72SGeorge Wilson } 2008b10bba72SGeorge Wilson if (error == 0) { 2009b10bba72SGeorge Wilson error = zap_update(os, ZVOL_ZAP_OBJ, 2010b10bba72SGeorge Wilson zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 2011b10bba72SGeorge Wilson &vbs, tx); 2012b10bba72SGeorge Wilson } 2013b10bba72SGeorge Wilson if (error == 0) { 2014b10bba72SGeorge Wilson error = dmu_object_set_blocksize( 2015b10bba72SGeorge Wilson os, ZVOL_OBJ, SPA_OLD_MAXBLOCKSIZE, 0, tx); 2016b10bba72SGeorge Wilson } 2017b10bba72SGeorge Wilson if (version >= SPA_VERSION_DEDUP && error == 0) { 2018b10bba72SGeorge Wilson error = zap_update(os, ZVOL_ZAP_OBJ, 20198d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 20208d265e66SGeorge Wilson &dedup, tx); 20218d265e66SGeorge Wilson } 2022681d9761SEric Taylor if (error == 0) 2023b5152584SMatthew Ahrens zv->zv_volblocksize = SPA_OLD_MAXBLOCKSIZE; 2024e7cbe64fSgw } 2025e7cbe64fSgw dmu_tx_commit(tx); 2026e7cbe64fSgw 2027e7cbe64fSgw /* 2028e7cbe64fSgw * We only need update the zvol's property if we are initializing 2029e7cbe64fSgw * the dump area for the first time. 2030e7cbe64fSgw */ 2031b10bba72SGeorge Wilson if (error == 0 && !resize) { 2032b10bba72SGeorge Wilson /* 2033b10bba72SGeorge Wilson * If MULTI_VDEV_CRASH_DUMP is active, use the NOPARITY checksum 2034b10bba72SGeorge Wilson * function. Otherwise, use the old default -- OFF. 2035b10bba72SGeorge Wilson */ 2036b10bba72SGeorge Wilson checksum = spa_feature_is_active(spa, 2037b10bba72SGeorge Wilson SPA_FEATURE_MULTI_VDEV_CRASH_DUMP) ? ZIO_CHECKSUM_NOPARITY : 2038b10bba72SGeorge Wilson ZIO_CHECKSUM_OFF; 2039b10bba72SGeorge Wilson 2040e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2041e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 2042e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 2043e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 2044e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 2045e7cbe64fSgw ZIO_COMPRESS_OFF) == 0); 2046e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 2047e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 2048810e43b2SBill Pijewski checksum) == 0); 20498d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP) { 20508d265e66SGeorge Wilson VERIFY(nvlist_add_uint64(nv, 20518d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 20528d265e66SGeorge Wilson ZIO_CHECKSUM_OFF) == 0); 20538d265e66SGeorge Wilson } 2054e7cbe64fSgw 205592241e0bSTom Erickson error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 205692241e0bSTom Erickson nv, NULL); 2057e7cbe64fSgw nvlist_free(nv); 2058e7cbe64fSgw } 2059e7cbe64fSgw 2060e7cbe64fSgw /* Allocate the space for the dump */ 2061b10bba72SGeorge Wilson if (error == 0) 2062b10bba72SGeorge Wilson error = zvol_prealloc(zv); 2063e7cbe64fSgw return (error); 2064e7cbe64fSgw } 2065e7cbe64fSgw 2066e7cbe64fSgw static int 2067e7cbe64fSgw zvol_dumpify(zvol_state_t *zv) 2068e7cbe64fSgw { 2069e7cbe64fSgw int error = 0; 2070e7cbe64fSgw uint64_t dumpsize = 0; 2071e7cbe64fSgw dmu_tx_t *tx; 2072e7cbe64fSgw objset_t *os = zv->zv_objset; 2073e7cbe64fSgw 2074681d9761SEric Taylor if (zv->zv_flags & ZVOL_RDONLY) 2075be6fd75aSMatthew Ahrens return (SET_ERROR(EROFS)); 2076e7cbe64fSgw 2077eb633035STom Caputi if (os->os_encrypted) 2078eb633035STom Caputi return (SET_ERROR(ENOTSUP)); 2079eb633035STom Caputi 2080e7cbe64fSgw if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 2081e7cbe64fSgw 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 20824445fffbSMatthew Ahrens boolean_t resize = (dumpsize > 0); 2083e7cbe64fSgw 2084e7cbe64fSgw if ((error = zvol_dump_init(zv, resize)) != 0) { 2085e7cbe64fSgw (void) zvol_dump_fini(zv); 2086e7cbe64fSgw return (error); 2087e7cbe64fSgw } 2088e7cbe64fSgw } 2089e7cbe64fSgw 2090e7cbe64fSgw /* 2091e7cbe64fSgw * Build up our lba mapping. 2092e7cbe64fSgw */ 2093e7cbe64fSgw error = zvol_get_lbas(zv); 2094e7cbe64fSgw if (error) { 2095e7cbe64fSgw (void) zvol_dump_fini(zv); 2096e7cbe64fSgw return (error); 2097e7cbe64fSgw } 2098e7cbe64fSgw 2099e7cbe64fSgw tx = dmu_tx_create(os); 2100e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2101e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 2102e7cbe64fSgw if (error) { 2103e7cbe64fSgw dmu_tx_abort(tx); 2104e7cbe64fSgw (void) zvol_dump_fini(zv); 2105e7cbe64fSgw return (error); 2106e7cbe64fSgw } 2107e7cbe64fSgw 2108e7cbe64fSgw zv->zv_flags |= ZVOL_DUMPIFIED; 2109e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 2110e7cbe64fSgw &zv->zv_volsize, tx); 2111e7cbe64fSgw dmu_tx_commit(tx); 2112e7cbe64fSgw 2113e7cbe64fSgw if (error) { 2114e7cbe64fSgw (void) zvol_dump_fini(zv); 2115e7cbe64fSgw return (error); 2116e7cbe64fSgw } 2117e7cbe64fSgw 2118e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 2119e7cbe64fSgw return (0); 2120e7cbe64fSgw } 2121e7cbe64fSgw 2122e7cbe64fSgw static int 2123e7cbe64fSgw zvol_dump_fini(zvol_state_t *zv) 2124e7cbe64fSgw { 2125e7cbe64fSgw dmu_tx_t *tx; 2126e7cbe64fSgw objset_t *os = zv->zv_objset; 2127e7cbe64fSgw nvlist_t *nv; 2128e7cbe64fSgw int error = 0; 2129afee20e4SGeorge Wilson uint64_t checksum, compress, refresrv, vbs, dedup; 21308d265e66SGeorge Wilson uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 2131e7cbe64fSgw 2132b7e50089Smaybee /* 2133b7e50089Smaybee * Attempt to restore the zvol back to its pre-dumpified state. 2134b7e50089Smaybee * This is a best-effort attempt as it's possible that not all 2135b7e50089Smaybee * of these properties were initialized during the dumpify process 2136b7e50089Smaybee * (i.e. error during zvol_dump_init). 2137b7e50089Smaybee */ 2138b7e50089Smaybee 2139e7cbe64fSgw tx = dmu_tx_create(os); 2140e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 2141e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 2142e7cbe64fSgw if (error) { 2143e7cbe64fSgw dmu_tx_abort(tx); 2144e7cbe64fSgw return (error); 2145e7cbe64fSgw } 2146b7e50089Smaybee (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 2147b7e50089Smaybee dmu_tx_commit(tx); 2148e7cbe64fSgw 2149e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2150e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 2151e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2152e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 2153e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 2154e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 215588b7b0f2SMatthew Ahrens (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 215688b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 2157e7cbe64fSgw 2158e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 2159e7cbe64fSgw (void) nvlist_add_uint64(nv, 2160e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 2161e7cbe64fSgw (void) nvlist_add_uint64(nv, 2162e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 2163e7cbe64fSgw (void) nvlist_add_uint64(nv, 2164e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 21658d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP && 21668d265e66SGeorge Wilson zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 21678d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 21688d265e66SGeorge Wilson (void) nvlist_add_uint64(nv, 21698d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 21708d265e66SGeorge Wilson } 217192241e0bSTom Erickson (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 217292241e0bSTom Erickson nv, NULL); 2173e7cbe64fSgw nvlist_free(nv); 2174e7cbe64fSgw 2175b7e50089Smaybee zvol_free_extents(zv); 2176b7e50089Smaybee zv->zv_flags &= ~ZVOL_DUMPIFIED; 2177b7e50089Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 2178681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 2179681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 2180681d9761SEric Taylor tx = dmu_tx_create(os); 2181681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 2182681d9761SEric Taylor error = dmu_tx_assign(tx, TXG_WAIT); 2183681d9761SEric Taylor if (error) { 2184681d9761SEric Taylor dmu_tx_abort(tx); 2185681d9761SEric Taylor return (error); 2186681d9761SEric Taylor } 2187b24ab676SJeff Bonwick if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 2188b24ab676SJeff Bonwick zv->zv_volblocksize = vbs; 2189681d9761SEric Taylor dmu_tx_commit(tx); 2190b7e50089Smaybee 2191e7cbe64fSgw return (0); 2192e7cbe64fSgw } 2193