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. 23fa9e4066Sahrens */ 24fa9e4066Sahrens 2555da60b9SMark J Musante /* Portions Copyright 2010 Robert Milkowski */ 2655da60b9SMark J Musante 27fa9e4066Sahrens /* 28fa9e4066Sahrens * ZFS volume emulation driver. 29fa9e4066Sahrens * 30fa9e4066Sahrens * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 31fa9e4066Sahrens * Volumes are accessed through the symbolic links named: 32fa9e4066Sahrens * 33fa9e4066Sahrens * /dev/zvol/dsk/<pool_name>/<dataset_name> 34fa9e4066Sahrens * /dev/zvol/rdsk/<pool_name>/<dataset_name> 35fa9e4066Sahrens * 36681d9761SEric Taylor * These links are created by the /dev filesystem (sdev_zvolops.c). 37fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 38fa9e4066Sahrens * run before opening and using a device. 39fa9e4066Sahrens */ 40fa9e4066Sahrens 41fa9e4066Sahrens #include <sys/types.h> 42fa9e4066Sahrens #include <sys/param.h> 43fa9e4066Sahrens #include <sys/errno.h> 44fa9e4066Sahrens #include <sys/uio.h> 45fa9e4066Sahrens #include <sys/buf.h> 46fa9e4066Sahrens #include <sys/modctl.h> 47fa9e4066Sahrens #include <sys/open.h> 48fa9e4066Sahrens #include <sys/kmem.h> 49fa9e4066Sahrens #include <sys/conf.h> 50fa9e4066Sahrens #include <sys/cmn_err.h> 51fa9e4066Sahrens #include <sys/stat.h> 52fa9e4066Sahrens #include <sys/zap.h> 53fa9e4066Sahrens #include <sys/spa.h> 54fa9e4066Sahrens #include <sys/zio.h> 55e7cbe64fSgw #include <sys/dmu_traverse.h> 56e7cbe64fSgw #include <sys/dnode.h> 57e7cbe64fSgw #include <sys/dsl_dataset.h> 58fa9e4066Sahrens #include <sys/dsl_prop.h> 59fa9e4066Sahrens #include <sys/dkio.h> 60fa9e4066Sahrens #include <sys/efi_partition.h> 61fa9e4066Sahrens #include <sys/byteorder.h> 62fa9e4066Sahrens #include <sys/pathname.h> 63fa9e4066Sahrens #include <sys/ddi.h> 64fa9e4066Sahrens #include <sys/sunddi.h> 65fa9e4066Sahrens #include <sys/crc32.h> 66fa9e4066Sahrens #include <sys/dirent.h> 67fa9e4066Sahrens #include <sys/policy.h> 68fa9e4066Sahrens #include <sys/fs/zfs.h> 69fa9e4066Sahrens #include <sys/zfs_ioctl.h> 70fa9e4066Sahrens #include <sys/mkdev.h> 7122ac5be4Sperrin #include <sys/zil.h> 72c5c6ffa0Smaybee #include <sys/refcount.h> 73c2e6a7d6Sperrin #include <sys/zfs_znode.h> 74c2e6a7d6Sperrin #include <sys/zfs_rlock.h> 75e7cbe64fSgw #include <sys/vdev_disk.h> 76e7cbe64fSgw #include <sys/vdev_impl.h> 77e7cbe64fSgw #include <sys/zvol.h> 78e7cbe64fSgw #include <sys/dumphdr.h> 791209a471SNeil Perrin #include <sys/zil_impl.h> 80fa9e4066Sahrens 81fa9e4066Sahrens #include "zfs_namecheck.h" 82fa9e4066Sahrens 83c99e4bdcSChris Kirby void *zfsdev_state; 84503ad85cSMatthew Ahrens static char *zvol_tag = "zvol_tag"; 85fa9e4066Sahrens 86e7cbe64fSgw #define ZVOL_DUMPSIZE "dumpsize" 87e7cbe64fSgw 88fa9e4066Sahrens /* 89c99e4bdcSChris Kirby * This lock protects the zfsdev_state structure from being modified 90fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 91fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 92fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 93fa9e4066Sahrens */ 94c99e4bdcSChris Kirby kmutex_t zfsdev_state_lock; 95fa9e4066Sahrens static uint32_t zvol_minors; 96fa9e4066Sahrens 97e7cbe64fSgw typedef struct zvol_extent { 9888b7b0f2SMatthew Ahrens list_node_t ze_node; 99e7cbe64fSgw dva_t ze_dva; /* dva associated with this extent */ 10088b7b0f2SMatthew Ahrens uint64_t ze_nblks; /* number of blocks in extent */ 101e7cbe64fSgw } zvol_extent_t; 102e7cbe64fSgw 103fa9e4066Sahrens /* 104fa9e4066Sahrens * The in-core state of each volume. 105fa9e4066Sahrens */ 106fa9e4066Sahrens typedef struct zvol_state { 107fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 108fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 10967bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 110fa9e4066Sahrens minor_t zv_minor; /* minor number */ 111fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 112701f66c4SEric Taylor uint8_t zv_flags; /* readonly, dumpified, etc. */ 113fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 114fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 115fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 11622ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 11788b7b0f2SMatthew Ahrens list_t zv_extents; /* List of extents for dump */ 118c2e6a7d6Sperrin znode_t zv_znode; /* for range locking */ 11994d1a210STim Haley dmu_buf_t *zv_dbuf; /* bonus handle */ 120fa9e4066Sahrens } zvol_state_t; 121fa9e4066Sahrens 122e7cbe64fSgw /* 123e7cbe64fSgw * zvol specific flags 124e7cbe64fSgw */ 125e7cbe64fSgw #define ZVOL_RDONLY 0x1 126e7cbe64fSgw #define ZVOL_DUMPIFIED 0x2 127c7f714e2SEric Taylor #define ZVOL_EXCL 0x4 128701f66c4SEric Taylor #define ZVOL_WCE 0x8 129e7cbe64fSgw 13067bd71c6Sperrin /* 13167bd71c6Sperrin * zvol maximum transfer in one DMU tx. 13267bd71c6Sperrin */ 13367bd71c6Sperrin int zvol_maxphys = DMU_MAX_ACCESS/2; 13467bd71c6Sperrin 13592241e0bSTom Erickson extern int zfs_set_prop_nvlist(const char *, zprop_source_t, 13692241e0bSTom Erickson nvlist_t *, nvlist_t **); 137681d9761SEric Taylor static int zvol_remove_zv(zvol_state_t *); 138feb08c6bSbillm static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 139e7cbe64fSgw static int zvol_dumpify(zvol_state_t *zv); 140e7cbe64fSgw static int zvol_dump_fini(zvol_state_t *zv); 141e7cbe64fSgw static int zvol_dump_init(zvol_state_t *zv, boolean_t resize); 14267bd71c6Sperrin 143fa9e4066Sahrens static void 144681d9761SEric Taylor zvol_size_changed(uint64_t volsize, major_t maj, minor_t min) 145fa9e4066Sahrens { 146681d9761SEric Taylor dev_t dev = makedevice(maj, min); 147fa9e4066Sahrens 148fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 149681d9761SEric Taylor "Size", volsize) == DDI_SUCCESS); 150fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 151681d9761SEric Taylor "Nblocks", lbtodb(volsize)) == DDI_SUCCESS); 152e7cbe64fSgw 153e7cbe64fSgw /* Notify specfs to invalidate the cached size */ 154e7cbe64fSgw spec_size_invalidate(dev, VBLK); 155e7cbe64fSgw spec_size_invalidate(dev, VCHR); 156fa9e4066Sahrens } 157fa9e4066Sahrens 158fa9e4066Sahrens int 159e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 160fa9e4066Sahrens { 161e9dbad6fSeschrock if (volsize == 0) 162fa9e4066Sahrens return (EINVAL); 163fa9e4066Sahrens 164e9dbad6fSeschrock if (volsize % blocksize != 0) 1655c5460e9Seschrock return (EINVAL); 1665c5460e9Seschrock 167fa9e4066Sahrens #ifdef _ILP32 168e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 169fa9e4066Sahrens return (EOVERFLOW); 170fa9e4066Sahrens #endif 171fa9e4066Sahrens return (0); 172fa9e4066Sahrens } 173fa9e4066Sahrens 174fa9e4066Sahrens int 175e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 176fa9e4066Sahrens { 177e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 178e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 179e9dbad6fSeschrock !ISP2(volblocksize)) 180fa9e4066Sahrens return (EDOM); 181fa9e4066Sahrens 182fa9e4066Sahrens return (0); 183fa9e4066Sahrens } 184fa9e4066Sahrens 185fa9e4066Sahrens int 186a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 187fa9e4066Sahrens { 188fa9e4066Sahrens int error; 189fa9e4066Sahrens dmu_object_info_t doi; 190a2eea2e1Sahrens uint64_t val; 191fa9e4066Sahrens 192a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 193fa9e4066Sahrens if (error) 194fa9e4066Sahrens return (error); 195fa9e4066Sahrens 196a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 197a2eea2e1Sahrens 198fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 199fa9e4066Sahrens 200a2eea2e1Sahrens if (error == 0) { 201a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 202a2eea2e1Sahrens doi.doi_data_block_size); 203a2eea2e1Sahrens } 204fa9e4066Sahrens 205fa9e4066Sahrens return (error); 206fa9e4066Sahrens } 207fa9e4066Sahrens 208fa9e4066Sahrens static zvol_state_t * 209e9dbad6fSeschrock zvol_minor_lookup(const char *name) 210fa9e4066Sahrens { 211fa9e4066Sahrens minor_t minor; 212fa9e4066Sahrens zvol_state_t *zv; 213fa9e4066Sahrens 214c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 215fa9e4066Sahrens 216c99e4bdcSChris Kirby for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 217c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 218fa9e4066Sahrens if (zv == NULL) 219fa9e4066Sahrens continue; 220fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 221f80ce222SChris Kirby return (zv); 222fa9e4066Sahrens } 223fa9e4066Sahrens 224f80ce222SChris Kirby return (NULL); 225fa9e4066Sahrens } 226fa9e4066Sahrens 227e7cbe64fSgw /* extent mapping arg */ 228e7cbe64fSgw struct maparg { 22988b7b0f2SMatthew Ahrens zvol_state_t *ma_zv; 23088b7b0f2SMatthew Ahrens uint64_t ma_blks; 231e7cbe64fSgw }; 232e7cbe64fSgw 233e7cbe64fSgw /*ARGSUSED*/ 234e7cbe64fSgw static int 2353f9d6ad7SLin Ling zvol_map_block(spa_t *spa, zilog_t *zilog, const blkptr_t *bp, arc_buf_t *pbuf, 236b24ab676SJeff Bonwick const zbookmark_t *zb, const dnode_phys_t *dnp, void *arg) 237e7cbe64fSgw { 23888b7b0f2SMatthew Ahrens struct maparg *ma = arg; 23988b7b0f2SMatthew Ahrens zvol_extent_t *ze; 24088b7b0f2SMatthew Ahrens int bs = ma->ma_zv->zv_volblocksize; 241e7cbe64fSgw 24288b7b0f2SMatthew Ahrens if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0) 24388b7b0f2SMatthew Ahrens return (0); 244e7cbe64fSgw 24588b7b0f2SMatthew Ahrens VERIFY3U(ma->ma_blks, ==, zb->zb_blkid); 24688b7b0f2SMatthew Ahrens ma->ma_blks++; 247e7cbe64fSgw 24888b7b0f2SMatthew Ahrens /* Abort immediately if we have encountered gang blocks */ 24988b7b0f2SMatthew Ahrens if (BP_IS_GANG(bp)) 25088b7b0f2SMatthew Ahrens return (EFRAGS); 251e7cbe64fSgw 25288b7b0f2SMatthew Ahrens /* 25388b7b0f2SMatthew Ahrens * See if the block is at the end of the previous extent. 25488b7b0f2SMatthew Ahrens */ 25588b7b0f2SMatthew Ahrens ze = list_tail(&ma->ma_zv->zv_extents); 25688b7b0f2SMatthew Ahrens if (ze && 25788b7b0f2SMatthew Ahrens DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) && 25888b7b0f2SMatthew Ahrens DVA_GET_OFFSET(BP_IDENTITY(bp)) == 25988b7b0f2SMatthew Ahrens DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) { 26088b7b0f2SMatthew Ahrens ze->ze_nblks++; 26188b7b0f2SMatthew Ahrens return (0); 262e7cbe64fSgw } 263e7cbe64fSgw 26488b7b0f2SMatthew Ahrens dprintf_bp(bp, "%s", "next blkptr:"); 265e7cbe64fSgw 26688b7b0f2SMatthew Ahrens /* start a new extent */ 26788b7b0f2SMatthew Ahrens ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP); 26888b7b0f2SMatthew Ahrens ze->ze_dva = bp->blk_dva[0]; /* structure assignment */ 26988b7b0f2SMatthew Ahrens ze->ze_nblks = 1; 27088b7b0f2SMatthew Ahrens list_insert_tail(&ma->ma_zv->zv_extents, ze); 27188b7b0f2SMatthew Ahrens return (0); 27288b7b0f2SMatthew Ahrens } 273e7cbe64fSgw 27488b7b0f2SMatthew Ahrens static void 27588b7b0f2SMatthew Ahrens zvol_free_extents(zvol_state_t *zv) 27688b7b0f2SMatthew Ahrens { 27788b7b0f2SMatthew Ahrens zvol_extent_t *ze; 278e7cbe64fSgw 27988b7b0f2SMatthew Ahrens while (ze = list_head(&zv->zv_extents)) { 28088b7b0f2SMatthew Ahrens list_remove(&zv->zv_extents, ze); 28188b7b0f2SMatthew Ahrens kmem_free(ze, sizeof (zvol_extent_t)); 282e7cbe64fSgw } 28388b7b0f2SMatthew Ahrens } 284e7cbe64fSgw 28588b7b0f2SMatthew Ahrens static int 28688b7b0f2SMatthew Ahrens zvol_get_lbas(zvol_state_t *zv) 28788b7b0f2SMatthew Ahrens { 2883adc9019SEric Taylor objset_t *os = zv->zv_objset; 28988b7b0f2SMatthew Ahrens struct maparg ma; 29088b7b0f2SMatthew Ahrens int err; 29188b7b0f2SMatthew Ahrens 29288b7b0f2SMatthew Ahrens ma.ma_zv = zv; 29388b7b0f2SMatthew Ahrens ma.ma_blks = 0; 29488b7b0f2SMatthew Ahrens zvol_free_extents(zv); 29588b7b0f2SMatthew Ahrens 2963adc9019SEric Taylor /* commit any in-flight changes before traversing the dataset */ 2973adc9019SEric Taylor txg_wait_synced(dmu_objset_pool(os), 0); 2983adc9019SEric Taylor err = traverse_dataset(dmu_objset_ds(os), 0, 29988b7b0f2SMatthew Ahrens TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma); 30088b7b0f2SMatthew Ahrens if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) { 30188b7b0f2SMatthew Ahrens zvol_free_extents(zv); 30288b7b0f2SMatthew Ahrens return (err ? err : EIO); 303e7cbe64fSgw } 30488b7b0f2SMatthew Ahrens 305e7cbe64fSgw return (0); 306e7cbe64fSgw } 307e7cbe64fSgw 308ecd6cf80Smarks /* ARGSUSED */ 309fa9e4066Sahrens void 310ecd6cf80Smarks zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 311fa9e4066Sahrens { 312da6c28aaSamw zfs_creat_t *zct = arg; 313da6c28aaSamw nvlist_t *nvprops = zct->zct_props; 314fa9e4066Sahrens int error; 315e9dbad6fSeschrock uint64_t volblocksize, volsize; 316fa9e4066Sahrens 317ecd6cf80Smarks VERIFY(nvlist_lookup_uint64(nvprops, 318e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 319ecd6cf80Smarks if (nvlist_lookup_uint64(nvprops, 320e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 321e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 322e9dbad6fSeschrock 323e9dbad6fSeschrock /* 324e7cbe64fSgw * These properties must be removed from the list so the generic 325e9dbad6fSeschrock * property setting step won't apply to them. 326e9dbad6fSeschrock */ 327ecd6cf80Smarks VERIFY(nvlist_remove_all(nvprops, 328e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 329ecd6cf80Smarks (void) nvlist_remove_all(nvprops, 330e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 331e9dbad6fSeschrock 332e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 333fa9e4066Sahrens DMU_OT_NONE, 0, tx); 334fa9e4066Sahrens ASSERT(error == 0); 335fa9e4066Sahrens 336fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 337fa9e4066Sahrens DMU_OT_NONE, 0, tx); 338fa9e4066Sahrens ASSERT(error == 0); 339fa9e4066Sahrens 340e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 341fa9e4066Sahrens ASSERT(error == 0); 342fa9e4066Sahrens } 343fa9e4066Sahrens 34422ac5be4Sperrin /* 34522ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 34622ac5be4Sperrin * after a system failure 34722ac5be4Sperrin */ 34822ac5be4Sperrin static int 34922ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 35022ac5be4Sperrin { 35122ac5be4Sperrin objset_t *os = zv->zv_objset; 35222ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 353b24ab676SJeff Bonwick uint64_t offset, length; 35422ac5be4Sperrin dmu_tx_t *tx; 35522ac5be4Sperrin int error; 35622ac5be4Sperrin 35722ac5be4Sperrin if (byteswap) 35822ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 35922ac5be4Sperrin 360b24ab676SJeff Bonwick offset = lr->lr_offset; 361b24ab676SJeff Bonwick length = lr->lr_length; 362b24ab676SJeff Bonwick 363b24ab676SJeff Bonwick /* If it's a dmu_sync() block, write the whole block */ 364b24ab676SJeff Bonwick if (lr->lr_common.lrc_reclen == sizeof (lr_write_t)) { 365b24ab676SJeff Bonwick uint64_t blocksize = BP_GET_LSIZE(&lr->lr_blkptr); 366b24ab676SJeff Bonwick if (length < blocksize) { 367b24ab676SJeff Bonwick offset -= offset % blocksize; 368b24ab676SJeff Bonwick length = blocksize; 369b24ab676SJeff Bonwick } 370b24ab676SJeff Bonwick } 371975c32a0SNeil Perrin 37222ac5be4Sperrin tx = dmu_tx_create(os); 373b24ab676SJeff Bonwick dmu_tx_hold_write(tx, ZVOL_OBJ, offset, length); 3741209a471SNeil Perrin error = dmu_tx_assign(tx, TXG_WAIT); 37522ac5be4Sperrin if (error) { 37622ac5be4Sperrin dmu_tx_abort(tx); 37722ac5be4Sperrin } else { 378b24ab676SJeff Bonwick dmu_write(os, ZVOL_OBJ, offset, length, data, tx); 37922ac5be4Sperrin dmu_tx_commit(tx); 38022ac5be4Sperrin } 38122ac5be4Sperrin 38222ac5be4Sperrin return (error); 38322ac5be4Sperrin } 38422ac5be4Sperrin 38522ac5be4Sperrin /* ARGSUSED */ 38622ac5be4Sperrin static int 38722ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 38822ac5be4Sperrin { 38922ac5be4Sperrin return (ENOTSUP); 39022ac5be4Sperrin } 39122ac5be4Sperrin 39222ac5be4Sperrin /* 39322ac5be4Sperrin * Callback vectors for replaying records. 39422ac5be4Sperrin * Only TX_WRITE is needed for zvol. 39522ac5be4Sperrin */ 39622ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 39722ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 39822ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 39922ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 40022ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 40122ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 40222ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 40322ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 40422ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 40522ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 40622ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 40722ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 40822ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 40922ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 410975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL */ 411975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ATTR */ 412975c32a0SNeil Perrin zvol_replay_err, /* TX_CREATE_ACL_ATTR */ 413975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL */ 414975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ATTR */ 415975c32a0SNeil Perrin zvol_replay_err, /* TX_MKDIR_ACL_ATTR */ 416975c32a0SNeil Perrin zvol_replay_err, /* TX_WRITE2 */ 41722ac5be4Sperrin }; 41822ac5be4Sperrin 419681d9761SEric Taylor int 420681d9761SEric Taylor zvol_name2minor(const char *name, minor_t *minor) 421681d9761SEric Taylor { 422681d9761SEric Taylor zvol_state_t *zv; 423681d9761SEric Taylor 424c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 425681d9761SEric Taylor zv = zvol_minor_lookup(name); 426681d9761SEric Taylor if (minor && zv) 427681d9761SEric Taylor *minor = zv->zv_minor; 428c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 429681d9761SEric Taylor return (zv ? 0 : -1); 430681d9761SEric Taylor } 431681d9761SEric Taylor 432e7cbe64fSgw /* 433e7cbe64fSgw * Create a minor node (plus a whole lot more) for the specified volume. 434fa9e4066Sahrens */ 435fa9e4066Sahrens int 436681d9761SEric Taylor zvol_create_minor(const char *name) 437fa9e4066Sahrens { 438c99e4bdcSChris Kirby zfs_soft_state_t *zs; 439fa9e4066Sahrens zvol_state_t *zv; 440fa9e4066Sahrens objset_t *os; 44167bd71c6Sperrin dmu_object_info_t doi; 442fa9e4066Sahrens minor_t minor = 0; 443fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 444fa9e4066Sahrens int error; 445fa9e4066Sahrens 446c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 447fa9e4066Sahrens 4481195e687SMark J Musante if (zvol_minor_lookup(name) != NULL) { 449c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 450fa9e4066Sahrens return (EEXIST); 451fa9e4066Sahrens } 452fa9e4066Sahrens 453503ad85cSMatthew Ahrens /* lie and say we're read-only */ 454503ad85cSMatthew Ahrens error = dmu_objset_own(name, DMU_OST_ZVOL, B_TRUE, zvol_tag, &os); 455fa9e4066Sahrens 456fa9e4066Sahrens if (error) { 457c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 458fa9e4066Sahrens return (error); 459fa9e4066Sahrens } 460fa9e4066Sahrens 461c99e4bdcSChris Kirby if ((minor = zfsdev_minor_alloc()) == 0) { 462503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 463c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 464fa9e4066Sahrens return (ENXIO); 465fa9e4066Sahrens } 466fa9e4066Sahrens 467c99e4bdcSChris Kirby if (ddi_soft_state_zalloc(zfsdev_state, minor) != DDI_SUCCESS) { 468503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 469c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 470fa9e4066Sahrens return (EAGAIN); 471fa9e4066Sahrens } 472e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 473e9dbad6fSeschrock (char *)name); 474fa9e4066Sahrens 475681d9761SEric Taylor (void) snprintf(chrbuf, sizeof (chrbuf), "%u,raw", minor); 476fa9e4066Sahrens 477fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 478fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 479c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 480503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 481c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 482fa9e4066Sahrens return (EAGAIN); 483fa9e4066Sahrens } 484fa9e4066Sahrens 485681d9761SEric Taylor (void) snprintf(blkbuf, sizeof (blkbuf), "%u", minor); 486fa9e4066Sahrens 487fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 488fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 489fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 490c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 491503ad85cSMatthew Ahrens dmu_objset_disown(os, zvol_tag); 492c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 493fa9e4066Sahrens return (EAGAIN); 494fa9e4066Sahrens } 495fa9e4066Sahrens 496c99e4bdcSChris Kirby zs = ddi_get_soft_state(zfsdev_state, minor); 497c99e4bdcSChris Kirby zs->zss_type = ZSST_ZVOL; 498c99e4bdcSChris Kirby zv = zs->zss_data = kmem_zalloc(sizeof (zvol_state_t), KM_SLEEP); 499681d9761SEric Taylor (void) strlcpy(zv->zv_name, name, MAXPATHLEN); 500fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 501fa9e4066Sahrens zv->zv_minor = minor; 502fa9e4066Sahrens zv->zv_objset = os; 503681d9761SEric Taylor if (dmu_objset_is_snapshot(os)) 504681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 505c2e6a7d6Sperrin mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 506c2e6a7d6Sperrin avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 507c2e6a7d6Sperrin sizeof (rl_t), offsetof(rl_t, r_node)); 50888b7b0f2SMatthew Ahrens list_create(&zv->zv_extents, sizeof (zvol_extent_t), 50988b7b0f2SMatthew Ahrens offsetof(zvol_extent_t, ze_node)); 51067bd71c6Sperrin /* get and cache the blocksize */ 51167bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 51267bd71c6Sperrin ASSERT(error == 0); 51367bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 51422ac5be4Sperrin 51555da60b9SMark J Musante if (zil_replay_disable) 51655da60b9SMark J Musante zil_destroy(dmu_objset_zil(os), B_FALSE); 51755da60b9SMark J Musante else 51855da60b9SMark J Musante zil_replay(os, zv, zvol_replay_vector); 519681d9761SEric Taylor dmu_objset_disown(os, zvol_tag); 520681d9761SEric Taylor zv->zv_objset = NULL; 521fa9e4066Sahrens 522fa9e4066Sahrens zvol_minors++; 523fa9e4066Sahrens 524c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 525fa9e4066Sahrens 526fa9e4066Sahrens return (0); 527fa9e4066Sahrens } 528fa9e4066Sahrens 529fa9e4066Sahrens /* 530fa9e4066Sahrens * Remove minor node for the specified volume. 531fa9e4066Sahrens */ 532681d9761SEric Taylor static int 533681d9761SEric Taylor zvol_remove_zv(zvol_state_t *zv) 534681d9761SEric Taylor { 535681d9761SEric Taylor char nmbuf[20]; 536c99e4bdcSChris Kirby minor_t minor = zv->zv_minor; 537681d9761SEric Taylor 538c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 539681d9761SEric Taylor if (zv->zv_total_opens != 0) 540681d9761SEric Taylor return (EBUSY); 541681d9761SEric Taylor 542c99e4bdcSChris Kirby (void) snprintf(nmbuf, sizeof (nmbuf), "%u,raw", minor); 543681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 544681d9761SEric Taylor 545c99e4bdcSChris Kirby (void) snprintf(nmbuf, sizeof (nmbuf), "%u", minor); 546681d9761SEric Taylor ddi_remove_minor_node(zfs_dip, nmbuf); 547681d9761SEric Taylor 548681d9761SEric Taylor avl_destroy(&zv->zv_znode.z_range_avl); 549681d9761SEric Taylor mutex_destroy(&zv->zv_znode.z_range_lock); 550681d9761SEric Taylor 551c99e4bdcSChris Kirby kmem_free(zv, sizeof (zvol_state_t)); 552c99e4bdcSChris Kirby 553c99e4bdcSChris Kirby ddi_soft_state_free(zfsdev_state, minor); 554681d9761SEric Taylor 555681d9761SEric Taylor zvol_minors--; 556681d9761SEric Taylor return (0); 557681d9761SEric Taylor } 558681d9761SEric Taylor 559fa9e4066Sahrens int 560e9dbad6fSeschrock zvol_remove_minor(const char *name) 561fa9e4066Sahrens { 562fa9e4066Sahrens zvol_state_t *zv; 563681d9761SEric Taylor int rc; 564fa9e4066Sahrens 565c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 566e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 567c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 568fa9e4066Sahrens return (ENXIO); 569fa9e4066Sahrens } 570681d9761SEric Taylor rc = zvol_remove_zv(zv); 571c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 572681d9761SEric Taylor return (rc); 573681d9761SEric Taylor } 574fa9e4066Sahrens 575681d9761SEric Taylor int 576681d9761SEric Taylor zvol_first_open(zvol_state_t *zv) 577681d9761SEric Taylor { 578681d9761SEric Taylor objset_t *os; 579681d9761SEric Taylor uint64_t volsize; 580681d9761SEric Taylor int error; 581681d9761SEric Taylor uint64_t readonly; 582fa9e4066Sahrens 583681d9761SEric Taylor /* lie and say we're read-only */ 584681d9761SEric Taylor error = dmu_objset_own(zv->zv_name, DMU_OST_ZVOL, B_TRUE, 585681d9761SEric Taylor zvol_tag, &os); 586681d9761SEric Taylor if (error) 587681d9761SEric Taylor return (error); 588fa9e4066Sahrens 589681d9761SEric Taylor error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 590681d9761SEric Taylor if (error) { 591681d9761SEric Taylor ASSERT(error == 0); 592681d9761SEric Taylor dmu_objset_disown(os, zvol_tag); 593681d9761SEric Taylor return (error); 594681d9761SEric Taylor } 595681d9761SEric Taylor zv->zv_objset = os; 59694d1a210STim Haley error = dmu_bonus_hold(os, ZVOL_OBJ, zvol_tag, &zv->zv_dbuf); 59794d1a210STim Haley if (error) { 59894d1a210STim Haley dmu_objset_disown(os, zvol_tag); 59994d1a210STim Haley return (error); 60094d1a210STim Haley } 601681d9761SEric Taylor zv->zv_volsize = volsize; 602681d9761SEric Taylor zv->zv_zilog = zil_open(os, zvol_get_data); 603681d9761SEric Taylor zvol_size_changed(zv->zv_volsize, ddi_driver_major(zfs_dip), 604681d9761SEric Taylor zv->zv_minor); 605fa9e4066Sahrens 606681d9761SEric Taylor VERIFY(dsl_prop_get_integer(zv->zv_name, "readonly", &readonly, 607681d9761SEric Taylor NULL) == 0); 608681d9761SEric Taylor if (readonly || dmu_objset_is_snapshot(os)) 609681d9761SEric Taylor zv->zv_flags |= ZVOL_RDONLY; 610681d9761SEric Taylor else 611681d9761SEric Taylor zv->zv_flags &= ~ZVOL_RDONLY; 612681d9761SEric Taylor return (error); 613681d9761SEric Taylor } 614fa9e4066Sahrens 615681d9761SEric Taylor void 616681d9761SEric Taylor zvol_last_close(zvol_state_t *zv) 617681d9761SEric Taylor { 61822ac5be4Sperrin zil_close(zv->zv_zilog); 61922ac5be4Sperrin zv->zv_zilog = NULL; 62094d1a210STim Haley dmu_buf_rele(zv->zv_dbuf, zvol_tag); 62194d1a210STim Haley zv->zv_dbuf = NULL; 622503ad85cSMatthew Ahrens dmu_objset_disown(zv->zv_objset, zvol_tag); 623fa9e4066Sahrens zv->zv_objset = NULL; 624fa9e4066Sahrens } 625fa9e4066Sahrens 626e7cbe64fSgw int 627e7cbe64fSgw zvol_prealloc(zvol_state_t *zv) 628e7cbe64fSgw { 629e7cbe64fSgw objset_t *os = zv->zv_objset; 630e7cbe64fSgw dmu_tx_t *tx; 631e7cbe64fSgw uint64_t refd, avail, usedobjs, availobjs; 632e7cbe64fSgw uint64_t resid = zv->zv_volsize; 633e7cbe64fSgw uint64_t off = 0; 634e7cbe64fSgw 635e7cbe64fSgw /* Check the space usage before attempting to allocate the space */ 636e7cbe64fSgw dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs); 637e7cbe64fSgw if (avail < zv->zv_volsize) 638e7cbe64fSgw return (ENOSPC); 639e7cbe64fSgw 640e7cbe64fSgw /* Free old extents if they exist */ 641e7cbe64fSgw zvol_free_extents(zv); 642e7cbe64fSgw 643e7cbe64fSgw while (resid != 0) { 644e7cbe64fSgw int error; 645e7cbe64fSgw uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE); 646e7cbe64fSgw 647e7cbe64fSgw tx = dmu_tx_create(os); 648e7cbe64fSgw dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 649e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 650e7cbe64fSgw if (error) { 651e7cbe64fSgw dmu_tx_abort(tx); 652cdb0ab79Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, off); 653e7cbe64fSgw return (error); 654e7cbe64fSgw } 65582c9918fSTim Haley dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx); 656e7cbe64fSgw dmu_tx_commit(tx); 657e7cbe64fSgw off += bytes; 658e7cbe64fSgw resid -= bytes; 659e7cbe64fSgw } 660e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 661e7cbe64fSgw 662e7cbe64fSgw return (0); 663e7cbe64fSgw } 664e7cbe64fSgw 665e7cbe64fSgw int 666681d9761SEric Taylor zvol_update_volsize(objset_t *os, uint64_t volsize) 667e7cbe64fSgw { 668e7cbe64fSgw dmu_tx_t *tx; 669e7cbe64fSgw int error; 670e7cbe64fSgw 671c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 672e7cbe64fSgw 673681d9761SEric Taylor tx = dmu_tx_create(os); 674e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 675e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 676e7cbe64fSgw if (error) { 677e7cbe64fSgw dmu_tx_abort(tx); 678e7cbe64fSgw return (error); 679e7cbe64fSgw } 680e7cbe64fSgw 681681d9761SEric Taylor error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, 682e7cbe64fSgw &volsize, tx); 683e7cbe64fSgw dmu_tx_commit(tx); 684e7cbe64fSgw 685e7cbe64fSgw if (error == 0) 686681d9761SEric Taylor error = dmu_free_long_range(os, 687cdb0ab79Smaybee ZVOL_OBJ, volsize, DMU_OBJECT_END); 688681d9761SEric Taylor return (error); 689681d9761SEric Taylor } 690e7cbe64fSgw 691681d9761SEric Taylor void 692681d9761SEric Taylor zvol_remove_minors(const char *name) 693681d9761SEric Taylor { 694681d9761SEric Taylor zvol_state_t *zv; 695681d9761SEric Taylor char *namebuf; 696681d9761SEric Taylor minor_t minor; 697681d9761SEric Taylor 698681d9761SEric Taylor namebuf = kmem_zalloc(strlen(name) + 2, KM_SLEEP); 699681d9761SEric Taylor (void) strncpy(namebuf, name, strlen(name)); 700681d9761SEric Taylor (void) strcat(namebuf, "/"); 701c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 702c99e4bdcSChris Kirby for (minor = 1; minor <= ZFSDEV_MAX_MINOR; minor++) { 703681d9761SEric Taylor 704c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 705681d9761SEric Taylor if (zv == NULL) 706681d9761SEric Taylor continue; 707681d9761SEric Taylor if (strncmp(namebuf, zv->zv_name, strlen(namebuf)) == 0) 708681d9761SEric Taylor (void) zvol_remove_zv(zv); 709e7cbe64fSgw } 710681d9761SEric Taylor kmem_free(namebuf, strlen(name) + 2); 711681d9761SEric Taylor 712c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 713e7cbe64fSgw } 714e7cbe64fSgw 715fa9e4066Sahrens int 71691ebeef5Sahrens zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 717fa9e4066Sahrens { 718681d9761SEric Taylor zvol_state_t *zv = NULL; 719681d9761SEric Taylor objset_t *os; 720fa9e4066Sahrens int error; 7215c5460e9Seschrock dmu_object_info_t doi; 722e7cbe64fSgw uint64_t old_volsize = 0ULL; 723681d9761SEric Taylor uint64_t readonly; 724fa9e4066Sahrens 725c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 726681d9761SEric Taylor zv = zvol_minor_lookup(name); 727681d9761SEric Taylor if ((error = dmu_objset_hold(name, FTAG, &os)) != 0) { 728c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 729681d9761SEric Taylor return (error); 730fa9e4066Sahrens } 731fa9e4066Sahrens 732681d9761SEric Taylor if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 || 733e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 734bb0ade09Sahrens doi.doi_data_block_size)) != 0) 735bb0ade09Sahrens goto out; 7365c5460e9Seschrock 737681d9761SEric Taylor VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, 738681d9761SEric Taylor NULL) == 0); 739681d9761SEric Taylor if (readonly) { 740bb0ade09Sahrens error = EROFS; 741bb0ade09Sahrens goto out; 742fa9e4066Sahrens } 743fa9e4066Sahrens 744681d9761SEric Taylor error = zvol_update_volsize(os, volsize); 745e7cbe64fSgw /* 746e7cbe64fSgw * Reinitialize the dump area to the new size. If we 747681d9761SEric Taylor * failed to resize the dump area then restore it back to 748681d9761SEric Taylor * its original size. 749e7cbe64fSgw */ 750681d9761SEric Taylor if (zv && error == 0) { 751681d9761SEric Taylor if (zv->zv_flags & ZVOL_DUMPIFIED) { 752681d9761SEric Taylor old_volsize = zv->zv_volsize; 753681d9761SEric Taylor zv->zv_volsize = volsize; 754681d9761SEric Taylor if ((error = zvol_dumpify(zv)) != 0 || 755681d9761SEric Taylor (error = dumpvp_resize()) != 0) { 756681d9761SEric Taylor (void) zvol_update_volsize(os, old_volsize); 757681d9761SEric Taylor zv->zv_volsize = old_volsize; 758681d9761SEric Taylor error = zvol_dumpify(zv); 759681d9761SEric Taylor } 760681d9761SEric Taylor } 761681d9761SEric Taylor if (error == 0) { 762681d9761SEric Taylor zv->zv_volsize = volsize; 763681d9761SEric Taylor zvol_size_changed(volsize, maj, zv->zv_minor); 764e7cbe64fSgw } 765fa9e4066Sahrens } 766fa9e4066Sahrens 767573ca77eSGeorge Wilson /* 768573ca77eSGeorge Wilson * Generate a LUN expansion event. 769573ca77eSGeorge Wilson */ 770681d9761SEric Taylor if (zv && error == 0) { 771573ca77eSGeorge Wilson sysevent_id_t eid; 772573ca77eSGeorge Wilson nvlist_t *attr; 773573ca77eSGeorge Wilson char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP); 774573ca77eSGeorge Wilson 775681d9761SEric Taylor (void) snprintf(physpath, MAXPATHLEN, "%s%u", ZVOL_PSEUDO_DEV, 776573ca77eSGeorge Wilson zv->zv_minor); 777573ca77eSGeorge Wilson 778573ca77eSGeorge Wilson VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0); 779573ca77eSGeorge Wilson VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0); 780573ca77eSGeorge Wilson 781573ca77eSGeorge Wilson (void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS, 782573ca77eSGeorge Wilson ESC_DEV_DLE, attr, &eid, DDI_SLEEP); 783573ca77eSGeorge Wilson 784573ca77eSGeorge Wilson nvlist_free(attr); 785573ca77eSGeorge Wilson kmem_free(physpath, MAXPATHLEN); 786573ca77eSGeorge Wilson } 787573ca77eSGeorge Wilson 788bb0ade09Sahrens out: 789681d9761SEric Taylor dmu_objset_rele(os, FTAG); 790bb0ade09Sahrens 791c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 792fa9e4066Sahrens 793fa9e4066Sahrens return (error); 794fa9e4066Sahrens } 795fa9e4066Sahrens 796fa9e4066Sahrens /*ARGSUSED*/ 797fa9e4066Sahrens int 798fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 799fa9e4066Sahrens { 800fa9e4066Sahrens zvol_state_t *zv; 801681d9761SEric Taylor int err = 0; 802fa9e4066Sahrens 803c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 804fa9e4066Sahrens 805c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(getminor(*devp), ZSST_ZVOL); 806fa9e4066Sahrens if (zv == NULL) { 807c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 808fa9e4066Sahrens return (ENXIO); 809fa9e4066Sahrens } 810fa9e4066Sahrens 811681d9761SEric Taylor if (zv->zv_total_opens == 0) 812681d9761SEric Taylor err = zvol_first_open(zv); 813681d9761SEric Taylor if (err) { 814c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 815681d9761SEric Taylor return (err); 816681d9761SEric Taylor } 817681d9761SEric Taylor if ((flag & FWRITE) && (zv->zv_flags & ZVOL_RDONLY)) { 818681d9761SEric Taylor err = EROFS; 819681d9761SEric Taylor goto out; 820fa9e4066Sahrens } 821c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 822681d9761SEric Taylor err = EBUSY; 823681d9761SEric Taylor goto out; 824c7f714e2SEric Taylor } 825c7f714e2SEric Taylor if (flag & FEXCL) { 826c7f714e2SEric Taylor if (zv->zv_total_opens != 0) { 827681d9761SEric Taylor err = EBUSY; 828681d9761SEric Taylor goto out; 829c7f714e2SEric Taylor } 830c7f714e2SEric Taylor zv->zv_flags |= ZVOL_EXCL; 831c7f714e2SEric Taylor } 832fa9e4066Sahrens 833fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 834fa9e4066Sahrens zv->zv_open_count[otyp]++; 835fa9e4066Sahrens zv->zv_total_opens++; 836fa9e4066Sahrens } 837c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 838fa9e4066Sahrens 839681d9761SEric Taylor return (err); 840681d9761SEric Taylor out: 841681d9761SEric Taylor if (zv->zv_total_opens == 0) 842681d9761SEric Taylor zvol_last_close(zv); 843c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 844681d9761SEric Taylor return (err); 845fa9e4066Sahrens } 846fa9e4066Sahrens 847fa9e4066Sahrens /*ARGSUSED*/ 848fa9e4066Sahrens int 849fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 850fa9e4066Sahrens { 851fa9e4066Sahrens minor_t minor = getminor(dev); 852fa9e4066Sahrens zvol_state_t *zv; 853681d9761SEric Taylor int error = 0; 854fa9e4066Sahrens 855c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 856fa9e4066Sahrens 857c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 858fa9e4066Sahrens if (zv == NULL) { 859c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 860fa9e4066Sahrens return (ENXIO); 861fa9e4066Sahrens } 862fa9e4066Sahrens 863c7f714e2SEric Taylor if (zv->zv_flags & ZVOL_EXCL) { 864c7f714e2SEric Taylor ASSERT(zv->zv_total_opens == 1); 865c7f714e2SEric Taylor zv->zv_flags &= ~ZVOL_EXCL; 866fa9e4066Sahrens } 867fa9e4066Sahrens 868fa9e4066Sahrens /* 869fa9e4066Sahrens * If the open count is zero, this is a spurious close. 870fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 871fa9e4066Sahrens */ 872fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 873fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 874fa9e4066Sahrens 875fa9e4066Sahrens /* 876fa9e4066Sahrens * You may get multiple opens, but only one close. 877fa9e4066Sahrens */ 878fa9e4066Sahrens zv->zv_open_count[otyp]--; 879fa9e4066Sahrens zv->zv_total_opens--; 880fa9e4066Sahrens 881681d9761SEric Taylor if (zv->zv_total_opens == 0) 882681d9761SEric Taylor zvol_last_close(zv); 883fa9e4066Sahrens 884c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 885681d9761SEric Taylor return (error); 886fa9e4066Sahrens } 887fa9e4066Sahrens 888feb08c6bSbillm static void 889b24ab676SJeff Bonwick zvol_get_done(zgd_t *zgd, int error) 89067bd71c6Sperrin { 891b24ab676SJeff Bonwick if (zgd->zgd_db) 892b24ab676SJeff Bonwick dmu_buf_rele(zgd->zgd_db, zgd); 893b24ab676SJeff Bonwick 894b24ab676SJeff Bonwick zfs_range_unlock(zgd->zgd_rl); 895b24ab676SJeff Bonwick 896b24ab676SJeff Bonwick if (error == 0 && zgd->zgd_bp) 897b24ab676SJeff Bonwick zil_add_block(zgd->zgd_zilog, zgd->zgd_bp); 89867bd71c6Sperrin 89967bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 90067bd71c6Sperrin } 90167bd71c6Sperrin 90267bd71c6Sperrin /* 90367bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 90467bd71c6Sperrin */ 905feb08c6bSbillm static int 90667bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 90767bd71c6Sperrin { 90867bd71c6Sperrin zvol_state_t *zv = arg; 90967bd71c6Sperrin objset_t *os = zv->zv_objset; 910b24ab676SJeff Bonwick uint64_t object = ZVOL_OBJ; 911b24ab676SJeff Bonwick uint64_t offset = lr->lr_offset; 912b24ab676SJeff Bonwick uint64_t size = lr->lr_length; /* length of user data */ 913b24ab676SJeff Bonwick blkptr_t *bp = &lr->lr_blkptr; 91467bd71c6Sperrin dmu_buf_t *db; 91567bd71c6Sperrin zgd_t *zgd; 91667bd71c6Sperrin int error; 91767bd71c6Sperrin 918b24ab676SJeff Bonwick ASSERT(zio != NULL); 919b24ab676SJeff Bonwick ASSERT(size != 0); 920b24ab676SJeff Bonwick 921b24ab676SJeff Bonwick zgd = kmem_zalloc(sizeof (zgd_t), KM_SLEEP); 922b24ab676SJeff Bonwick zgd->zgd_zilog = zv->zv_zilog; 923b24ab676SJeff Bonwick zgd->zgd_rl = zfs_range_lock(&zv->zv_znode, offset, size, RL_READER); 924feb08c6bSbillm 925c2e6a7d6Sperrin /* 926c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 927c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 928c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 929c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 930c2e6a7d6Sperrin * we don't have to write the data twice. 931c2e6a7d6Sperrin */ 932b24ab676SJeff Bonwick if (buf != NULL) { /* immediate write */ 933b24ab676SJeff Bonwick error = dmu_read(os, object, offset, size, buf, 934b24ab676SJeff Bonwick DMU_READ_NO_PREFETCH); 935b24ab676SJeff Bonwick } else { 936b24ab676SJeff Bonwick size = zv->zv_volblocksize; 937b24ab676SJeff Bonwick offset = P2ALIGN(offset, size); 93847cb52daSJeff Bonwick error = dmu_buf_hold(os, object, offset, zgd, &db, 93947cb52daSJeff Bonwick DMU_READ_NO_PREFETCH); 940b24ab676SJeff Bonwick if (error == 0) { 941b24ab676SJeff Bonwick zgd->zgd_db = db; 942b24ab676SJeff Bonwick zgd->zgd_bp = bp; 94367bd71c6Sperrin 944b24ab676SJeff Bonwick ASSERT(db->db_offset == offset); 945b24ab676SJeff Bonwick ASSERT(db->db_size == size); 94667bd71c6Sperrin 947b24ab676SJeff Bonwick error = dmu_sync(zio, lr->lr_common.lrc_txg, 948b24ab676SJeff Bonwick zvol_get_done, zgd); 949975c32a0SNeil Perrin 950b24ab676SJeff Bonwick if (error == 0) 951b24ab676SJeff Bonwick return (0); 952b24ab676SJeff Bonwick } 953975c32a0SNeil Perrin } 954975c32a0SNeil Perrin 955b24ab676SJeff Bonwick zvol_get_done(zgd, error); 956b24ab676SJeff Bonwick 95767bd71c6Sperrin return (error); 95867bd71c6Sperrin } 95967bd71c6Sperrin 960a24e15ceSperrin /* 961a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 96222ac5be4Sperrin * 96322ac5be4Sperrin * We store data in the log buffers if it's small enough. 96467bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 96522ac5be4Sperrin */ 96667bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 96722ac5be4Sperrin 968feb08c6bSbillm static void 969510b6c0eSNeil Perrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t resid, 970510b6c0eSNeil Perrin boolean_t sync) 97122ac5be4Sperrin { 972feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 9731209a471SNeil Perrin zilog_t *zilog = zv->zv_zilog; 974510b6c0eSNeil Perrin boolean_t slogging; 975e09fa4daSNeil Perrin ssize_t immediate_write_sz; 976510b6c0eSNeil Perrin 977b24ab676SJeff Bonwick if (zil_replaying(zilog, tx)) 9781209a471SNeil Perrin return; 9791209a471SNeil Perrin 980e09fa4daSNeil Perrin immediate_write_sz = (zilog->zl_logbias == ZFS_LOGBIAS_THROUGHPUT) 981e09fa4daSNeil Perrin ? 0 : zvol_immediate_write_sz; 982e09fa4daSNeil Perrin 983e09fa4daSNeil Perrin slogging = spa_has_slogs(zilog->zl_spa) && 984e09fa4daSNeil Perrin (zilog->zl_logbias == ZFS_LOGBIAS_LATENCY); 985feb08c6bSbillm 986510b6c0eSNeil Perrin while (resid) { 987510b6c0eSNeil Perrin itx_t *itx; 988510b6c0eSNeil Perrin lr_write_t *lr; 989510b6c0eSNeil Perrin ssize_t len; 990510b6c0eSNeil Perrin itx_wr_state_t write_state; 991510b6c0eSNeil Perrin 992510b6c0eSNeil Perrin /* 993510b6c0eSNeil Perrin * Unlike zfs_log_write() we can be called with 994510b6c0eSNeil Perrin * upto DMU_MAX_ACCESS/2 (5MB) writes. 995510b6c0eSNeil Perrin */ 996e09fa4daSNeil Perrin if (blocksize > immediate_write_sz && !slogging && 997510b6c0eSNeil Perrin resid >= blocksize && off % blocksize == 0) { 998510b6c0eSNeil Perrin write_state = WR_INDIRECT; /* uses dmu_sync */ 999510b6c0eSNeil Perrin len = blocksize; 1000510b6c0eSNeil Perrin } else if (sync) { 1001510b6c0eSNeil Perrin write_state = WR_COPIED; 1002510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1003510b6c0eSNeil Perrin } else { 1004510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1005510b6c0eSNeil Perrin len = MIN(ZIL_MAX_LOG_DATA, resid); 1006510b6c0eSNeil Perrin } 1007510b6c0eSNeil Perrin 1008510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + 1009510b6c0eSNeil Perrin (write_state == WR_COPIED ? len : 0)); 1010feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 1011510b6c0eSNeil Perrin if (write_state == WR_COPIED && dmu_read(zv->zv_objset, 10127bfdf011SNeil Perrin ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) { 1013b24ab676SJeff Bonwick zil_itx_destroy(itx); 1014510b6c0eSNeil Perrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 1015510b6c0eSNeil Perrin lr = (lr_write_t *)&itx->itx_lr; 1016510b6c0eSNeil Perrin write_state = WR_NEED_COPY; 1017510b6c0eSNeil Perrin } 1018510b6c0eSNeil Perrin 1019510b6c0eSNeil Perrin itx->itx_wr_state = write_state; 1020510b6c0eSNeil Perrin if (write_state == WR_NEED_COPY) 1021510b6c0eSNeil Perrin itx->itx_sod += len; 1022feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 1023feb08c6bSbillm lr->lr_offset = off; 1024510b6c0eSNeil Perrin lr->lr_length = len; 1025b24ab676SJeff Bonwick lr->lr_blkoff = 0; 1026feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 1027feb08c6bSbillm 1028510b6c0eSNeil Perrin itx->itx_private = zv; 1029510b6c0eSNeil Perrin itx->itx_sync = sync; 1030510b6c0eSNeil Perrin 1031*5002558fSNeil Perrin zil_itx_assign(zilog, itx, tx); 1032510b6c0eSNeil Perrin 1033510b6c0eSNeil Perrin off += len; 1034510b6c0eSNeil Perrin resid -= len; 103522ac5be4Sperrin } 103622ac5be4Sperrin } 103722ac5be4Sperrin 103888b7b0f2SMatthew Ahrens static int 103988b7b0f2SMatthew Ahrens zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size, 104088b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1041e7cbe64fSgw { 1042e7cbe64fSgw vdev_disk_t *dvd; 1043e7cbe64fSgw int c; 1044e7cbe64fSgw int numerrors = 0; 1045e7cbe64fSgw 1046e7cbe64fSgw for (c = 0; c < vd->vdev_children; c++) { 104721ecdf64SLin Ling ASSERT(vd->vdev_ops == &vdev_mirror_ops || 104821ecdf64SLin Ling vd->vdev_ops == &vdev_replacing_ops || 104921ecdf64SLin Ling vd->vdev_ops == &vdev_spare_ops); 105088b7b0f2SMatthew Ahrens int err = zvol_dumpio_vdev(vd->vdev_child[c], 105188b7b0f2SMatthew Ahrens addr, offset, size, doread, isdump); 105288b7b0f2SMatthew Ahrens if (err != 0) { 1053e7cbe64fSgw numerrors++; 105488b7b0f2SMatthew Ahrens } else if (doread) { 1055e7cbe64fSgw break; 1056e7cbe64fSgw } 1057e7cbe64fSgw } 1058e7cbe64fSgw 1059e7cbe64fSgw if (!vd->vdev_ops->vdev_op_leaf) 1060e7cbe64fSgw return (numerrors < vd->vdev_children ? 0 : EIO); 1061e7cbe64fSgw 1062dc0bb255SEric Taylor if (doread && !vdev_readable(vd)) 1063dc0bb255SEric Taylor return (EIO); 1064dc0bb255SEric Taylor else if (!doread && !vdev_writeable(vd)) 1065e7cbe64fSgw return (EIO); 1066e7cbe64fSgw 1067e7cbe64fSgw dvd = vd->vdev_tsd; 1068e7cbe64fSgw ASSERT3P(dvd, !=, NULL); 1069e7cbe64fSgw offset += VDEV_LABEL_START_SIZE; 1070e7cbe64fSgw 1071e7cbe64fSgw if (ddi_in_panic() || isdump) { 107288b7b0f2SMatthew Ahrens ASSERT(!doread); 107388b7b0f2SMatthew Ahrens if (doread) 1074e7cbe64fSgw return (EIO); 1075e7cbe64fSgw return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset), 1076e7cbe64fSgw lbtodb(size))); 1077e7cbe64fSgw } else { 1078e7cbe64fSgw return (vdev_disk_physio(dvd->vd_lh, addr, size, offset, 107988b7b0f2SMatthew Ahrens doread ? B_READ : B_WRITE)); 1080e7cbe64fSgw } 1081e7cbe64fSgw } 1082e7cbe64fSgw 108388b7b0f2SMatthew Ahrens static int 108488b7b0f2SMatthew Ahrens zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size, 108588b7b0f2SMatthew Ahrens boolean_t doread, boolean_t isdump) 1086e7cbe64fSgw { 1087e7cbe64fSgw vdev_t *vd; 1088e7cbe64fSgw int error; 108988b7b0f2SMatthew Ahrens zvol_extent_t *ze; 1090e7cbe64fSgw spa_t *spa = dmu_objset_spa(zv->zv_objset); 1091e7cbe64fSgw 109288b7b0f2SMatthew Ahrens /* Must be sector aligned, and not stradle a block boundary. */ 109388b7b0f2SMatthew Ahrens if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) || 109488b7b0f2SMatthew Ahrens P2BOUNDARY(offset, size, zv->zv_volblocksize)) { 1095e7cbe64fSgw return (EINVAL); 109688b7b0f2SMatthew Ahrens } 109788b7b0f2SMatthew Ahrens ASSERT(size <= zv->zv_volblocksize); 1098e7cbe64fSgw 109988b7b0f2SMatthew Ahrens /* Locate the extent this belongs to */ 110088b7b0f2SMatthew Ahrens ze = list_head(&zv->zv_extents); 110188b7b0f2SMatthew Ahrens while (offset >= ze->ze_nblks * zv->zv_volblocksize) { 110288b7b0f2SMatthew Ahrens offset -= ze->ze_nblks * zv->zv_volblocksize; 110388b7b0f2SMatthew Ahrens ze = list_next(&zv->zv_extents, ze); 110488b7b0f2SMatthew Ahrens } 110524cc0e1cSGeorge Wilson 110624cc0e1cSGeorge Wilson if (!ddi_in_panic()) 110724cc0e1cSGeorge Wilson spa_config_enter(spa, SCL_STATE, FTAG, RW_READER); 110824cc0e1cSGeorge Wilson 110988b7b0f2SMatthew Ahrens vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva)); 111088b7b0f2SMatthew Ahrens offset += DVA_GET_OFFSET(&ze->ze_dva); 111188b7b0f2SMatthew Ahrens error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump); 111224cc0e1cSGeorge Wilson 111324cc0e1cSGeorge Wilson if (!ddi_in_panic()) 111424cc0e1cSGeorge Wilson spa_config_exit(spa, SCL_STATE, FTAG); 111524cc0e1cSGeorge Wilson 1116e7cbe64fSgw return (error); 1117e7cbe64fSgw } 1118e7cbe64fSgw 1119fa9e4066Sahrens int 1120fa9e4066Sahrens zvol_strategy(buf_t *bp) 1121fa9e4066Sahrens { 1122c99e4bdcSChris Kirby zfs_soft_state_t *zs = NULL; 1123c99e4bdcSChris Kirby zvol_state_t *zv; 1124fa9e4066Sahrens uint64_t off, volsize; 112588b7b0f2SMatthew Ahrens size_t resid; 1126fa9e4066Sahrens char *addr; 112722ac5be4Sperrin objset_t *os; 1128c2e6a7d6Sperrin rl_t *rl; 1129fa9e4066Sahrens int error = 0; 113088b7b0f2SMatthew Ahrens boolean_t doread = bp->b_flags & B_READ; 1131f80ce222SChris Kirby boolean_t is_dump; 1132510b6c0eSNeil Perrin boolean_t sync; 1133fa9e4066Sahrens 1134c99e4bdcSChris Kirby if (getminor(bp->b_edev) == 0) { 1135c99e4bdcSChris Kirby error = EINVAL; 1136c99e4bdcSChris Kirby } else { 1137c99e4bdcSChris Kirby zs = ddi_get_soft_state(zfsdev_state, getminor(bp->b_edev)); 1138c99e4bdcSChris Kirby if (zs == NULL) 1139c99e4bdcSChris Kirby error = ENXIO; 1140c99e4bdcSChris Kirby else if (zs->zss_type != ZSST_ZVOL) 1141c99e4bdcSChris Kirby error = EINVAL; 1142fa9e4066Sahrens } 1143fa9e4066Sahrens 1144c99e4bdcSChris Kirby if (error) { 1145c99e4bdcSChris Kirby bioerror(bp, error); 1146fa9e4066Sahrens biodone(bp); 1147fa9e4066Sahrens return (0); 1148fa9e4066Sahrens } 1149fa9e4066Sahrens 1150c99e4bdcSChris Kirby zv = zs->zss_data; 1151c99e4bdcSChris Kirby 1152681d9761SEric Taylor if (!(bp->b_flags & B_READ) && (zv->zv_flags & ZVOL_RDONLY)) { 1153fa9e4066Sahrens bioerror(bp, EROFS); 1154fa9e4066Sahrens biodone(bp); 1155fa9e4066Sahrens return (0); 1156fa9e4066Sahrens } 1157fa9e4066Sahrens 1158fa9e4066Sahrens off = ldbtob(bp->b_blkno); 1159fa9e4066Sahrens volsize = zv->zv_volsize; 1160fa9e4066Sahrens 116122ac5be4Sperrin os = zv->zv_objset; 116222ac5be4Sperrin ASSERT(os != NULL); 1163fa9e4066Sahrens 1164fa9e4066Sahrens bp_mapin(bp); 1165fa9e4066Sahrens addr = bp->b_un.b_addr; 1166fa9e4066Sahrens resid = bp->b_bcount; 1167fa9e4066Sahrens 116888b7b0f2SMatthew Ahrens if (resid > 0 && (off < 0 || off >= volsize)) { 116988b7b0f2SMatthew Ahrens bioerror(bp, EIO); 117088b7b0f2SMatthew Ahrens biodone(bp); 117188b7b0f2SMatthew Ahrens return (0); 117288b7b0f2SMatthew Ahrens } 117373ec3d9cSgw 1174f80ce222SChris Kirby is_dump = zv->zv_flags & ZVOL_DUMPIFIED; 117555da60b9SMark J Musante sync = ((!(bp->b_flags & B_ASYNC) && 117655da60b9SMark J Musante !(zv->zv_flags & ZVOL_WCE)) || 117755da60b9SMark J Musante (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS)) && 117855da60b9SMark J Musante !doread && !is_dump; 1179510b6c0eSNeil Perrin 1180a24e15ceSperrin /* 1181a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 1182a24e15ceSperrin * we can't change the data whilst calculating the checksum. 1183a24e15ceSperrin */ 1184c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 118588b7b0f2SMatthew Ahrens doread ? RL_READER : RL_WRITER); 1186fa9e4066Sahrens 1187e7cbe64fSgw while (resid != 0 && off < volsize) { 118888b7b0f2SMatthew Ahrens size_t size = MIN(resid, zvol_maxphys); 1189e7cbe64fSgw if (is_dump) { 1190e7cbe64fSgw size = MIN(size, P2END(off, zv->zv_volblocksize) - off); 119188b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, off, size, 119288b7b0f2SMatthew Ahrens doread, B_FALSE); 119388b7b0f2SMatthew Ahrens } else if (doread) { 11947bfdf011SNeil Perrin error = dmu_read(os, ZVOL_OBJ, off, size, addr, 11957bfdf011SNeil Perrin DMU_READ_PREFETCH); 1196fa9e4066Sahrens } else { 119722ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 1198fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 1199fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 1200fa9e4066Sahrens if (error) { 1201fa9e4066Sahrens dmu_tx_abort(tx); 1202fa9e4066Sahrens } else { 120322ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 1204510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, size, sync); 1205fa9e4066Sahrens dmu_tx_commit(tx); 1206fa9e4066Sahrens } 1207fa9e4066Sahrens } 1208b87f3af3Sperrin if (error) { 1209b87f3af3Sperrin /* convert checksum errors into IO errors */ 1210b87f3af3Sperrin if (error == ECKSUM) 1211b87f3af3Sperrin error = EIO; 1212fa9e4066Sahrens break; 1213b87f3af3Sperrin } 1214fa9e4066Sahrens off += size; 1215fa9e4066Sahrens addr += size; 1216fa9e4066Sahrens resid -= size; 1217fa9e4066Sahrens } 1218c2e6a7d6Sperrin zfs_range_unlock(rl); 1219fa9e4066Sahrens 1220fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 1221fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 1222fa9e4066Sahrens 1223510b6c0eSNeil Perrin if (sync) 1224*5002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1225feb08c6bSbillm biodone(bp); 122622ac5be4Sperrin 1227fa9e4066Sahrens return (0); 1228fa9e4066Sahrens } 1229fa9e4066Sahrens 123067bd71c6Sperrin /* 123167bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 123267bd71c6Sperrin * Using our own routine instead of the default minphys() 123367bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 123467bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 123567bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 123667bd71c6Sperrin * 56K on X86 and 128K on sparc). 123767bd71c6Sperrin */ 123867bd71c6Sperrin void 123967bd71c6Sperrin zvol_minphys(struct buf *bp) 124067bd71c6Sperrin { 124167bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 124267bd71c6Sperrin bp->b_bcount = zvol_maxphys; 124367bd71c6Sperrin } 124467bd71c6Sperrin 1245e7cbe64fSgw int 1246e7cbe64fSgw zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks) 1247e7cbe64fSgw { 1248e7cbe64fSgw minor_t minor = getminor(dev); 1249e7cbe64fSgw zvol_state_t *zv; 1250e7cbe64fSgw int error = 0; 1251e7cbe64fSgw uint64_t size; 1252e7cbe64fSgw uint64_t boff; 1253e7cbe64fSgw uint64_t resid; 1254e7cbe64fSgw 1255c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1256e7cbe64fSgw if (zv == NULL) 1257e7cbe64fSgw return (ENXIO); 1258e7cbe64fSgw 1259e7cbe64fSgw boff = ldbtob(blkno); 1260e7cbe64fSgw resid = ldbtob(nblocks); 126188b7b0f2SMatthew Ahrens 126288b7b0f2SMatthew Ahrens VERIFY3U(boff + resid, <=, zv->zv_volsize); 126388b7b0f2SMatthew Ahrens 1264e7cbe64fSgw while (resid) { 1265e7cbe64fSgw size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff); 126688b7b0f2SMatthew Ahrens error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE); 1267e7cbe64fSgw if (error) 1268e7cbe64fSgw break; 1269e7cbe64fSgw boff += size; 1270e7cbe64fSgw addr += size; 1271e7cbe64fSgw resid -= size; 1272e7cbe64fSgw } 1273e7cbe64fSgw 1274e7cbe64fSgw return (error); 1275e7cbe64fSgw } 1276e7cbe64fSgw 1277fa9e4066Sahrens /*ARGSUSED*/ 1278fa9e4066Sahrens int 1279feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 1280fa9e4066Sahrens { 1281c7ca1008Sgw minor_t minor = getminor(dev); 1282c7ca1008Sgw zvol_state_t *zv; 128373ec3d9cSgw uint64_t volsize; 1284c2e6a7d6Sperrin rl_t *rl; 1285feb08c6bSbillm int error = 0; 1286fa9e4066Sahrens 1287c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1288c7ca1008Sgw if (zv == NULL) 1289c7ca1008Sgw return (ENXIO); 1290c7ca1008Sgw 129173ec3d9cSgw volsize = zv->zv_volsize; 129273ec3d9cSgw if (uio->uio_resid > 0 && 129373ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 129473ec3d9cSgw return (EIO); 129573ec3d9cSgw 129688b7b0f2SMatthew Ahrens if (zv->zv_flags & ZVOL_DUMPIFIED) { 129788b7b0f2SMatthew Ahrens error = physio(zvol_strategy, NULL, dev, B_READ, 129888b7b0f2SMatthew Ahrens zvol_minphys, uio); 129988b7b0f2SMatthew Ahrens return (error); 130088b7b0f2SMatthew Ahrens } 130188b7b0f2SMatthew Ahrens 1302c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1303c2e6a7d6Sperrin RL_READER); 130473ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1305feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1306fa9e4066Sahrens 130773ec3d9cSgw /* don't read past the end */ 130873ec3d9cSgw if (bytes > volsize - uio->uio_loffset) 130973ec3d9cSgw bytes = volsize - uio->uio_loffset; 131073ec3d9cSgw 1311feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 1312b87f3af3Sperrin if (error) { 1313b87f3af3Sperrin /* convert checksum errors into IO errors */ 1314b87f3af3Sperrin if (error == ECKSUM) 1315b87f3af3Sperrin error = EIO; 1316feb08c6bSbillm break; 1317b87f3af3Sperrin } 1318feb08c6bSbillm } 1319c2e6a7d6Sperrin zfs_range_unlock(rl); 1320feb08c6bSbillm return (error); 1321fa9e4066Sahrens } 1322fa9e4066Sahrens 1323fa9e4066Sahrens /*ARGSUSED*/ 1324fa9e4066Sahrens int 1325feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 1326fa9e4066Sahrens { 1327c7ca1008Sgw minor_t minor = getminor(dev); 1328c7ca1008Sgw zvol_state_t *zv; 132973ec3d9cSgw uint64_t volsize; 1330c2e6a7d6Sperrin rl_t *rl; 1331feb08c6bSbillm int error = 0; 1332510b6c0eSNeil Perrin boolean_t sync; 1333feb08c6bSbillm 1334c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1335c7ca1008Sgw if (zv == NULL) 1336c7ca1008Sgw return (ENXIO); 1337c7ca1008Sgw 133873ec3d9cSgw volsize = zv->zv_volsize; 133973ec3d9cSgw if (uio->uio_resid > 0 && 134073ec3d9cSgw (uio->uio_loffset < 0 || uio->uio_loffset >= volsize)) 134173ec3d9cSgw return (EIO); 134273ec3d9cSgw 1343e7cbe64fSgw if (zv->zv_flags & ZVOL_DUMPIFIED) { 1344e7cbe64fSgw error = physio(zvol_strategy, NULL, dev, B_WRITE, 1345e7cbe64fSgw zvol_minphys, uio); 1346e7cbe64fSgw return (error); 1347e7cbe64fSgw } 1348e7cbe64fSgw 134955da60b9SMark J Musante sync = !(zv->zv_flags & ZVOL_WCE) || 135055da60b9SMark J Musante (zv->zv_objset->os_sync == ZFS_SYNC_ALWAYS); 1351510b6c0eSNeil Perrin 1352c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 1353c2e6a7d6Sperrin RL_WRITER); 135473ec3d9cSgw while (uio->uio_resid > 0 && uio->uio_loffset < volsize) { 1355feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 1356feb08c6bSbillm uint64_t off = uio->uio_loffset; 1357feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 135873ec3d9cSgw 135973ec3d9cSgw if (bytes > volsize - off) /* don't write past the end */ 136073ec3d9cSgw bytes = volsize - off; 136173ec3d9cSgw 1362feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 1363feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 1364feb08c6bSbillm if (error) { 1365feb08c6bSbillm dmu_tx_abort(tx); 1366feb08c6bSbillm break; 1367feb08c6bSbillm } 136894d1a210STim Haley error = dmu_write_uio_dbuf(zv->zv_dbuf, uio, bytes, tx); 1369feb08c6bSbillm if (error == 0) 1370510b6c0eSNeil Perrin zvol_log_write(zv, tx, off, bytes, sync); 1371feb08c6bSbillm dmu_tx_commit(tx); 1372feb08c6bSbillm 1373feb08c6bSbillm if (error) 1374feb08c6bSbillm break; 1375feb08c6bSbillm } 1376c2e6a7d6Sperrin zfs_range_unlock(rl); 1377510b6c0eSNeil Perrin if (sync) 1378*5002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1379feb08c6bSbillm return (error); 1380fa9e4066Sahrens } 1381fa9e4066Sahrens 1382c7f714e2SEric Taylor int 1383c7f714e2SEric Taylor zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs) 1384c7f714e2SEric Taylor { 1385c7f714e2SEric Taylor struct uuid uuid = EFI_RESERVED; 1386c7f714e2SEric Taylor efi_gpe_t gpe = { 0 }; 1387c7f714e2SEric Taylor uint32_t crc; 1388c7f714e2SEric Taylor dk_efi_t efi; 1389c7f714e2SEric Taylor int length; 1390c7f714e2SEric Taylor char *ptr; 1391c7f714e2SEric Taylor 1392c7f714e2SEric Taylor if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag)) 1393c7f714e2SEric Taylor return (EFAULT); 1394c7f714e2SEric Taylor ptr = (char *)(uintptr_t)efi.dki_data_64; 1395c7f714e2SEric Taylor length = efi.dki_length; 1396c7f714e2SEric Taylor /* 1397c7f714e2SEric Taylor * Some clients may attempt to request a PMBR for the 1398c7f714e2SEric Taylor * zvol. Currently this interface will return EINVAL to 1399c7f714e2SEric Taylor * such requests. These requests could be supported by 1400c7f714e2SEric Taylor * adding a check for lba == 0 and consing up an appropriate 1401c7f714e2SEric Taylor * PMBR. 1402c7f714e2SEric Taylor */ 1403c7f714e2SEric Taylor if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0) 1404c7f714e2SEric Taylor return (EINVAL); 1405c7f714e2SEric Taylor 1406c7f714e2SEric Taylor gpe.efi_gpe_StartingLBA = LE_64(34ULL); 1407c7f714e2SEric Taylor gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1); 1408c7f714e2SEric Taylor UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 1409c7f714e2SEric Taylor 1410c7f714e2SEric Taylor if (efi.dki_lba == 1) { 1411c7f714e2SEric Taylor efi_gpt_t gpt = { 0 }; 1412c7f714e2SEric Taylor 1413c7f714e2SEric Taylor gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 1414c7f714e2SEric Taylor gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 1415c7f714e2SEric Taylor gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 1416c7f714e2SEric Taylor gpt.efi_gpt_MyLBA = LE_64(1ULL); 1417c7f714e2SEric Taylor gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 1418c7f714e2SEric Taylor gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1); 1419c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 1420c7f714e2SEric Taylor gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1421c7f714e2SEric Taylor gpt.efi_gpt_SizeOfPartitionEntry = 1422c7f714e2SEric Taylor LE_32(sizeof (efi_gpe_t)); 1423c7f714e2SEric Taylor CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 1424c7f714e2SEric Taylor gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1425c7f714e2SEric Taylor CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 1426c7f714e2SEric Taylor gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1427c7f714e2SEric Taylor if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length), 1428c7f714e2SEric Taylor flag)) 1429c7f714e2SEric Taylor return (EFAULT); 1430c7f714e2SEric Taylor ptr += sizeof (gpt); 1431c7f714e2SEric Taylor length -= sizeof (gpt); 1432c7f714e2SEric Taylor } 1433c7f714e2SEric Taylor if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe), 1434c7f714e2SEric Taylor length), flag)) 1435c7f714e2SEric Taylor return (EFAULT); 1436c7f714e2SEric Taylor return (0); 1437c7f714e2SEric Taylor } 1438c7f714e2SEric Taylor 14393fb517f7SJames Moore /* 14403fb517f7SJames Moore * BEGIN entry points to allow external callers access to the volume. 14413fb517f7SJames Moore */ 14423fb517f7SJames Moore /* 14433fb517f7SJames Moore * Return the volume parameters needed for access from an external caller. 14443fb517f7SJames Moore * These values are invariant as long as the volume is held open. 14453fb517f7SJames Moore */ 14463fb517f7SJames Moore int 14473fb517f7SJames Moore zvol_get_volume_params(minor_t minor, uint64_t *blksize, 14483fb517f7SJames Moore uint64_t *max_xfer_len, void **minor_hdl, void **objset_hdl, void **zil_hdl, 14493fb517f7SJames Moore void **rl_hdl, void **bonus_hdl) 14503fb517f7SJames Moore { 14513fb517f7SJames Moore zvol_state_t *zv; 14523fb517f7SJames Moore 1453c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(minor, ZSST_ZVOL); 1454c99e4bdcSChris Kirby if (zv == NULL) 14553fb517f7SJames Moore return (ENXIO); 14563fb517f7SJames Moore if (zv->zv_flags & ZVOL_DUMPIFIED) 14573fb517f7SJames Moore return (ENXIO); 14583fb517f7SJames Moore 14593fb517f7SJames Moore ASSERT(blksize && max_xfer_len && minor_hdl && 14603fb517f7SJames Moore objset_hdl && zil_hdl && rl_hdl && bonus_hdl); 14613fb517f7SJames Moore 14623fb517f7SJames Moore *blksize = zv->zv_volblocksize; 14633fb517f7SJames Moore *max_xfer_len = (uint64_t)zvol_maxphys; 14643fb517f7SJames Moore *minor_hdl = zv; 14653fb517f7SJames Moore *objset_hdl = zv->zv_objset; 14663fb517f7SJames Moore *zil_hdl = zv->zv_zilog; 14673fb517f7SJames Moore *rl_hdl = &zv->zv_znode; 14683fb517f7SJames Moore *bonus_hdl = zv->zv_dbuf; 14693fb517f7SJames Moore return (0); 14703fb517f7SJames Moore } 14713fb517f7SJames Moore 14723fb517f7SJames Moore /* 14733fb517f7SJames Moore * Return the current volume size to an external caller. 14743fb517f7SJames Moore * The size can change while the volume is open. 14753fb517f7SJames Moore */ 14763fb517f7SJames Moore uint64_t 14773fb517f7SJames Moore zvol_get_volume_size(void *minor_hdl) 14783fb517f7SJames Moore { 14793fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 14803fb517f7SJames Moore 14813fb517f7SJames Moore return (zv->zv_volsize); 14823fb517f7SJames Moore } 14833fb517f7SJames Moore 14843fb517f7SJames Moore /* 14853fb517f7SJames Moore * Return the current WCE setting to an external caller. 14863fb517f7SJames Moore * The WCE setting can change while the volume is open. 14873fb517f7SJames Moore */ 14883fb517f7SJames Moore int 14893fb517f7SJames Moore zvol_get_volume_wce(void *minor_hdl) 14903fb517f7SJames Moore { 14913fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 14923fb517f7SJames Moore 14933fb517f7SJames Moore return ((zv->zv_flags & ZVOL_WCE) ? 1 : 0); 14943fb517f7SJames Moore } 14953fb517f7SJames Moore 14963fb517f7SJames Moore /* 14973fb517f7SJames Moore * Entry point for external callers to zvol_log_write 14983fb517f7SJames Moore */ 14993fb517f7SJames Moore void 15003fb517f7SJames Moore zvol_log_write_minor(void *minor_hdl, dmu_tx_t *tx, offset_t off, ssize_t resid, 15013fb517f7SJames Moore boolean_t sync) 15023fb517f7SJames Moore { 15033fb517f7SJames Moore zvol_state_t *zv = minor_hdl; 15043fb517f7SJames Moore 15053fb517f7SJames Moore zvol_log_write(zv, tx, off, resid, sync); 15063fb517f7SJames Moore } 15073fb517f7SJames Moore /* 15083fb517f7SJames Moore * END entry points to allow external callers access to the volume. 15093fb517f7SJames Moore */ 15103fb517f7SJames Moore 1511fa9e4066Sahrens /* 1512fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 1513fa9e4066Sahrens */ 1514fa9e4066Sahrens /*ARGSUSED*/ 1515fa9e4066Sahrens int 1516fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 1517fa9e4066Sahrens { 1518fa9e4066Sahrens zvol_state_t *zv; 1519af2c4821Smaybee struct dk_cinfo dki; 1520fa9e4066Sahrens struct dk_minfo dkm; 1521af2c4821Smaybee struct dk_callback *dkc; 1522fa9e4066Sahrens int error = 0; 1523e7cbe64fSgw rl_t *rl; 1524fa9e4066Sahrens 1525c99e4bdcSChris Kirby mutex_enter(&zfsdev_state_lock); 1526fa9e4066Sahrens 1527c99e4bdcSChris Kirby zv = zfsdev_get_soft_state(getminor(dev), ZSST_ZVOL); 1528fa9e4066Sahrens 1529fa9e4066Sahrens if (zv == NULL) { 1530c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1531fa9e4066Sahrens return (ENXIO); 1532fa9e4066Sahrens } 1533701f66c4SEric Taylor ASSERT(zv->zv_total_opens > 0); 1534fa9e4066Sahrens 1535fa9e4066Sahrens switch (cmd) { 1536fa9e4066Sahrens 1537fa9e4066Sahrens case DKIOCINFO: 1538af2c4821Smaybee bzero(&dki, sizeof (dki)); 1539af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1540af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1541af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 15423adc9019SEric Taylor dki.dki_unit = getminor(dev); 1543af2c4821Smaybee dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1544c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1545af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1546fa9e4066Sahrens error = EFAULT; 1547fa9e4066Sahrens return (error); 1548fa9e4066Sahrens 1549fa9e4066Sahrens case DKIOCGMEDIAINFO: 1550fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1551fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1552fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1553fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1554c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1555fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1556fa9e4066Sahrens error = EFAULT; 1557fa9e4066Sahrens return (error); 1558fa9e4066Sahrens 1559fa9e4066Sahrens case DKIOCGETEFI: 1560c7f714e2SEric Taylor { 1561c7f714e2SEric Taylor uint64_t vs = zv->zv_volsize; 1562c7f714e2SEric Taylor uint8_t bs = zv->zv_min_bs; 1563fa9e4066Sahrens 1564c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1565c7f714e2SEric Taylor error = zvol_getefi((void *)arg, flag, vs, bs); 1566c7f714e2SEric Taylor return (error); 156768a5ac4dSmaybee } 1568fa9e4066Sahrens 1569feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1570af2c4821Smaybee dkc = (struct dk_callback *)arg; 1571c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1572*5002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1573af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1574af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1575af2c4821Smaybee error = 0; 1576af2c4821Smaybee } 1577701f66c4SEric Taylor return (error); 1578701f66c4SEric Taylor 1579701f66c4SEric Taylor case DKIOCGETWCE: 1580701f66c4SEric Taylor { 1581701f66c4SEric Taylor int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0; 1582701f66c4SEric Taylor if (ddi_copyout(&wce, (void *)arg, sizeof (int), 1583701f66c4SEric Taylor flag)) 1584701f66c4SEric Taylor error = EFAULT; 1585701f66c4SEric Taylor break; 1586701f66c4SEric Taylor } 1587701f66c4SEric Taylor case DKIOCSETWCE: 1588701f66c4SEric Taylor { 1589701f66c4SEric Taylor int wce; 1590701f66c4SEric Taylor if (ddi_copyin((void *)arg, &wce, sizeof (int), 1591701f66c4SEric Taylor flag)) { 1592701f66c4SEric Taylor error = EFAULT; 1593701f66c4SEric Taylor break; 1594701f66c4SEric Taylor } 1595701f66c4SEric Taylor if (wce) { 1596701f66c4SEric Taylor zv->zv_flags |= ZVOL_WCE; 1597c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1598701f66c4SEric Taylor } else { 1599701f66c4SEric Taylor zv->zv_flags &= ~ZVOL_WCE; 1600c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1601*5002558fSNeil Perrin zil_commit(zv->zv_zilog, ZVOL_OBJ); 1602701f66c4SEric Taylor } 1603701f66c4SEric Taylor return (0); 1604701f66c4SEric Taylor } 1605feb08c6bSbillm 1606b6130eadSmaybee case DKIOCGGEOM: 1607b6130eadSmaybee case DKIOCGVTOC: 1608e7cbe64fSgw /* 1609e7cbe64fSgw * commands using these (like prtvtoc) expect ENOTSUP 1610e7cbe64fSgw * since we're emulating an EFI label 1611e7cbe64fSgw */ 1612b6130eadSmaybee error = ENOTSUP; 1613b6130eadSmaybee break; 1614b6130eadSmaybee 1615e7cbe64fSgw case DKIOCDUMPINIT: 1616e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1617e7cbe64fSgw RL_WRITER); 1618e7cbe64fSgw error = zvol_dumpify(zv); 1619e7cbe64fSgw zfs_range_unlock(rl); 1620e7cbe64fSgw break; 1621e7cbe64fSgw 1622e7cbe64fSgw case DKIOCDUMPFINI: 162306d5ae10SEric Taylor if (!(zv->zv_flags & ZVOL_DUMPIFIED)) 162406d5ae10SEric Taylor break; 1625e7cbe64fSgw rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize, 1626e7cbe64fSgw RL_WRITER); 1627e7cbe64fSgw error = zvol_dump_fini(zv); 1628e7cbe64fSgw zfs_range_unlock(rl); 1629e7cbe64fSgw break; 1630e7cbe64fSgw 1631fa9e4066Sahrens default: 163268a5ac4dSmaybee error = ENOTTY; 1633fa9e4066Sahrens break; 1634fa9e4066Sahrens 1635fa9e4066Sahrens } 1636c99e4bdcSChris Kirby mutex_exit(&zfsdev_state_lock); 1637fa9e4066Sahrens return (error); 1638fa9e4066Sahrens } 1639fa9e4066Sahrens 1640fa9e4066Sahrens int 1641fa9e4066Sahrens zvol_busy(void) 1642fa9e4066Sahrens { 1643fa9e4066Sahrens return (zvol_minors != 0); 1644fa9e4066Sahrens } 1645fa9e4066Sahrens 1646fa9e4066Sahrens void 1647fa9e4066Sahrens zvol_init(void) 1648fa9e4066Sahrens { 1649c99e4bdcSChris Kirby VERIFY(ddi_soft_state_init(&zfsdev_state, sizeof (zfs_soft_state_t), 1650c99e4bdcSChris Kirby 1) == 0); 1651c99e4bdcSChris Kirby mutex_init(&zfsdev_state_lock, NULL, MUTEX_DEFAULT, NULL); 1652fa9e4066Sahrens } 1653fa9e4066Sahrens 1654fa9e4066Sahrens void 1655fa9e4066Sahrens zvol_fini(void) 1656fa9e4066Sahrens { 1657c99e4bdcSChris Kirby mutex_destroy(&zfsdev_state_lock); 1658c99e4bdcSChris Kirby ddi_soft_state_fini(&zfsdev_state); 1659fa9e4066Sahrens } 1660e7cbe64fSgw 1661e7cbe64fSgw static int 1662e7cbe64fSgw zvol_dump_init(zvol_state_t *zv, boolean_t resize) 1663e7cbe64fSgw { 1664e7cbe64fSgw dmu_tx_t *tx; 1665e7cbe64fSgw int error = 0; 1666e7cbe64fSgw objset_t *os = zv->zv_objset; 1667e7cbe64fSgw nvlist_t *nv = NULL; 16688d265e66SGeorge Wilson uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1669e7cbe64fSgw 1670c99e4bdcSChris Kirby ASSERT(MUTEX_HELD(&zfsdev_state_lock)); 1671681d9761SEric Taylor error = dmu_free_long_range(zv->zv_objset, ZVOL_OBJ, 0, 1672681d9761SEric Taylor DMU_OBJECT_END); 1673681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1674681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1675e7cbe64fSgw 1676e7cbe64fSgw tx = dmu_tx_create(os); 1677e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1678681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1679e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1680e7cbe64fSgw if (error) { 1681e7cbe64fSgw dmu_tx_abort(tx); 1682e7cbe64fSgw return (error); 1683e7cbe64fSgw } 1684e7cbe64fSgw 1685e7cbe64fSgw /* 1686e7cbe64fSgw * If we are resizing the dump device then we only need to 1687e7cbe64fSgw * update the refreservation to match the newly updated 1688e7cbe64fSgw * zvolsize. Otherwise, we save off the original state of the 1689e7cbe64fSgw * zvol so that we can restore them if the zvol is ever undumpified. 1690e7cbe64fSgw */ 1691e7cbe64fSgw if (resize) { 1692e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, 1693e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1694e7cbe64fSgw &zv->zv_volsize, tx); 1695e7cbe64fSgw } else { 1696afee20e4SGeorge Wilson uint64_t checksum, compress, refresrv, vbs, dedup; 169788b7b0f2SMatthew Ahrens 1698e7cbe64fSgw error = dsl_prop_get_integer(zv->zv_name, 1699e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL); 1700e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1701e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL); 1702e7cbe64fSgw error = error ? error : dsl_prop_get_integer(zv->zv_name, 1703e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL); 170488b7b0f2SMatthew Ahrens error = error ? error : dsl_prop_get_integer(zv->zv_name, 170588b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL); 17068d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP) { 17078d265e66SGeorge Wilson error = error ? error : 17088d265e66SGeorge Wilson dsl_prop_get_integer(zv->zv_name, 17098d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), &dedup, NULL); 17108d265e66SGeorge Wilson } 1711e7cbe64fSgw 1712e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1713e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, 1714e7cbe64fSgw &compress, tx); 1715e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1716e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx); 1717e7cbe64fSgw error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 1718e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, 1719e7cbe64fSgw &refresrv, tx); 172088b7b0f2SMatthew Ahrens error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 172188b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, 172288b7b0f2SMatthew Ahrens &vbs, tx); 1723681d9761SEric Taylor error = error ? error : dmu_object_set_blocksize( 1724681d9761SEric Taylor os, ZVOL_OBJ, SPA_MAXBLOCKSIZE, 0, tx); 17258d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP) { 17268d265e66SGeorge Wilson error = error ? error : zap_update(os, ZVOL_ZAP_OBJ, 17278d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, 17288d265e66SGeorge Wilson &dedup, tx); 17298d265e66SGeorge Wilson } 1730681d9761SEric Taylor if (error == 0) 1731681d9761SEric Taylor zv->zv_volblocksize = SPA_MAXBLOCKSIZE; 1732e7cbe64fSgw } 1733e7cbe64fSgw dmu_tx_commit(tx); 1734e7cbe64fSgw 1735e7cbe64fSgw /* 1736e7cbe64fSgw * We only need update the zvol's property if we are initializing 1737e7cbe64fSgw * the dump area for the first time. 1738e7cbe64fSgw */ 1739e7cbe64fSgw if (!resize) { 1740e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1741e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1742e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0); 1743e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1744e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 1745e7cbe64fSgw ZIO_COMPRESS_OFF) == 0); 1746e7cbe64fSgw VERIFY(nvlist_add_uint64(nv, 1747e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 1748e7cbe64fSgw ZIO_CHECKSUM_OFF) == 0); 17498d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP) { 17508d265e66SGeorge Wilson VERIFY(nvlist_add_uint64(nv, 17518d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 17528d265e66SGeorge Wilson ZIO_CHECKSUM_OFF) == 0); 17538d265e66SGeorge Wilson } 1754e7cbe64fSgw 175592241e0bSTom Erickson error = zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 175692241e0bSTom Erickson nv, NULL); 1757e7cbe64fSgw nvlist_free(nv); 1758e7cbe64fSgw 1759e7cbe64fSgw if (error) 1760e7cbe64fSgw return (error); 1761e7cbe64fSgw } 1762e7cbe64fSgw 1763e7cbe64fSgw /* Allocate the space for the dump */ 1764e7cbe64fSgw error = zvol_prealloc(zv); 1765e7cbe64fSgw return (error); 1766e7cbe64fSgw } 1767e7cbe64fSgw 1768e7cbe64fSgw static int 1769e7cbe64fSgw zvol_dumpify(zvol_state_t *zv) 1770e7cbe64fSgw { 1771e7cbe64fSgw int error = 0; 1772e7cbe64fSgw uint64_t dumpsize = 0; 1773e7cbe64fSgw dmu_tx_t *tx; 1774e7cbe64fSgw objset_t *os = zv->zv_objset; 1775e7cbe64fSgw 1776681d9761SEric Taylor if (zv->zv_flags & ZVOL_RDONLY) 1777e7cbe64fSgw return (EROFS); 1778e7cbe64fSgw 1779e7cbe64fSgw if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 1780e7cbe64fSgw 8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) { 1781e7cbe64fSgw boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE; 1782e7cbe64fSgw 1783e7cbe64fSgw if ((error = zvol_dump_init(zv, resize)) != 0) { 1784e7cbe64fSgw (void) zvol_dump_fini(zv); 1785e7cbe64fSgw return (error); 1786e7cbe64fSgw } 1787e7cbe64fSgw } 1788e7cbe64fSgw 1789e7cbe64fSgw /* 1790e7cbe64fSgw * Build up our lba mapping. 1791e7cbe64fSgw */ 1792e7cbe64fSgw error = zvol_get_lbas(zv); 1793e7cbe64fSgw if (error) { 1794e7cbe64fSgw (void) zvol_dump_fini(zv); 1795e7cbe64fSgw return (error); 1796e7cbe64fSgw } 1797e7cbe64fSgw 1798e7cbe64fSgw tx = dmu_tx_create(os); 1799e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1800e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1801e7cbe64fSgw if (error) { 1802e7cbe64fSgw dmu_tx_abort(tx); 1803e7cbe64fSgw (void) zvol_dump_fini(zv); 1804e7cbe64fSgw return (error); 1805e7cbe64fSgw } 1806e7cbe64fSgw 1807e7cbe64fSgw zv->zv_flags |= ZVOL_DUMPIFIED; 1808e7cbe64fSgw error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1, 1809e7cbe64fSgw &zv->zv_volsize, tx); 1810e7cbe64fSgw dmu_tx_commit(tx); 1811e7cbe64fSgw 1812e7cbe64fSgw if (error) { 1813e7cbe64fSgw (void) zvol_dump_fini(zv); 1814e7cbe64fSgw return (error); 1815e7cbe64fSgw } 1816e7cbe64fSgw 1817e7cbe64fSgw txg_wait_synced(dmu_objset_pool(os), 0); 1818e7cbe64fSgw return (0); 1819e7cbe64fSgw } 1820e7cbe64fSgw 1821e7cbe64fSgw static int 1822e7cbe64fSgw zvol_dump_fini(zvol_state_t *zv) 1823e7cbe64fSgw { 1824e7cbe64fSgw dmu_tx_t *tx; 1825e7cbe64fSgw objset_t *os = zv->zv_objset; 1826e7cbe64fSgw nvlist_t *nv; 1827e7cbe64fSgw int error = 0; 1828afee20e4SGeorge Wilson uint64_t checksum, compress, refresrv, vbs, dedup; 18298d265e66SGeorge Wilson uint64_t version = spa_version(dmu_objset_spa(zv->zv_objset)); 1830e7cbe64fSgw 1831b7e50089Smaybee /* 1832b7e50089Smaybee * Attempt to restore the zvol back to its pre-dumpified state. 1833b7e50089Smaybee * This is a best-effort attempt as it's possible that not all 1834b7e50089Smaybee * of these properties were initialized during the dumpify process 1835b7e50089Smaybee * (i.e. error during zvol_dump_init). 1836b7e50089Smaybee */ 1837b7e50089Smaybee 1838e7cbe64fSgw tx = dmu_tx_create(os); 1839e7cbe64fSgw dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 1840e7cbe64fSgw error = dmu_tx_assign(tx, TXG_WAIT); 1841e7cbe64fSgw if (error) { 1842e7cbe64fSgw dmu_tx_abort(tx); 1843e7cbe64fSgw return (error); 1844e7cbe64fSgw } 1845b7e50089Smaybee (void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx); 1846b7e50089Smaybee dmu_tx_commit(tx); 1847e7cbe64fSgw 1848e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1849e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum); 1850e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1851e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress); 1852e7cbe64fSgw (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 1853e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv); 185488b7b0f2SMatthew Ahrens (void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 185588b7b0f2SMatthew Ahrens zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs); 1856e7cbe64fSgw 1857e7cbe64fSgw VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0); 1858e7cbe64fSgw (void) nvlist_add_uint64(nv, 1859e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum); 1860e7cbe64fSgw (void) nvlist_add_uint64(nv, 1861e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress); 1862e7cbe64fSgw (void) nvlist_add_uint64(nv, 1863e7cbe64fSgw zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv); 18648d265e66SGeorge Wilson if (version >= SPA_VERSION_DEDUP && 18658d265e66SGeorge Wilson zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, 18668d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), 8, 1, &dedup) == 0) { 18678d265e66SGeorge Wilson (void) nvlist_add_uint64(nv, 18688d265e66SGeorge Wilson zfs_prop_to_name(ZFS_PROP_DEDUP), dedup); 18698d265e66SGeorge Wilson } 187092241e0bSTom Erickson (void) zfs_set_prop_nvlist(zv->zv_name, ZPROP_SRC_LOCAL, 187192241e0bSTom Erickson nv, NULL); 1872e7cbe64fSgw nvlist_free(nv); 1873e7cbe64fSgw 1874b7e50089Smaybee zvol_free_extents(zv); 1875b7e50089Smaybee zv->zv_flags &= ~ZVOL_DUMPIFIED; 1876b7e50089Smaybee (void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END); 1877681d9761SEric Taylor /* wait for dmu_free_long_range to actually free the blocks */ 1878681d9761SEric Taylor txg_wait_synced(dmu_objset_pool(zv->zv_objset), 0); 1879681d9761SEric Taylor tx = dmu_tx_create(os); 1880681d9761SEric Taylor dmu_tx_hold_bonus(tx, ZVOL_OBJ); 1881681d9761SEric Taylor error = dmu_tx_assign(tx, TXG_WAIT); 1882681d9761SEric Taylor if (error) { 1883681d9761SEric Taylor dmu_tx_abort(tx); 1884681d9761SEric Taylor return (error); 1885681d9761SEric Taylor } 1886b24ab676SJeff Bonwick if (dmu_object_set_blocksize(os, ZVOL_OBJ, vbs, 0, tx) == 0) 1887b24ab676SJeff Bonwick zv->zv_volblocksize = vbs; 1888681d9761SEric Taylor dmu_tx_commit(tx); 1889b7e50089Smaybee 1890e7cbe64fSgw return (0); 1891e7cbe64fSgw } 1892