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 /* 227f7322feSeschrock * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27fa9e4066Sahrens 28fa9e4066Sahrens /* 29fa9e4066Sahrens * ZFS volume emulation driver. 30fa9e4066Sahrens * 31fa9e4066Sahrens * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 32fa9e4066Sahrens * Volumes are accessed through the symbolic links named: 33fa9e4066Sahrens * 34fa9e4066Sahrens * /dev/zvol/dsk/<pool_name>/<dataset_name> 35fa9e4066Sahrens * /dev/zvol/rdsk/<pool_name>/<dataset_name> 36fa9e4066Sahrens * 37fa9e4066Sahrens * These links are created by the ZFS-specific devfsadm link generator. 38fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 39fa9e4066Sahrens * run before opening and using a device. 40fa9e4066Sahrens */ 41fa9e4066Sahrens 42fa9e4066Sahrens #include <sys/types.h> 43fa9e4066Sahrens #include <sys/param.h> 44fa9e4066Sahrens #include <sys/errno.h> 45fa9e4066Sahrens #include <sys/aio_req.h> 46fa9e4066Sahrens #include <sys/uio.h> 47fa9e4066Sahrens #include <sys/buf.h> 48fa9e4066Sahrens #include <sys/modctl.h> 49fa9e4066Sahrens #include <sys/open.h> 50fa9e4066Sahrens #include <sys/kmem.h> 51fa9e4066Sahrens #include <sys/conf.h> 52fa9e4066Sahrens #include <sys/cmn_err.h> 53fa9e4066Sahrens #include <sys/stat.h> 54fa9e4066Sahrens #include <sys/zap.h> 55fa9e4066Sahrens #include <sys/spa.h> 56fa9e4066Sahrens #include <sys/zio.h> 57fa9e4066Sahrens #include <sys/dsl_prop.h> 58fa9e4066Sahrens #include <sys/dkio.h> 59fa9e4066Sahrens #include <sys/efi_partition.h> 60fa9e4066Sahrens #include <sys/byteorder.h> 61fa9e4066Sahrens #include <sys/pathname.h> 62fa9e4066Sahrens #include <sys/ddi.h> 63fa9e4066Sahrens #include <sys/sunddi.h> 64fa9e4066Sahrens #include <sys/crc32.h> 65fa9e4066Sahrens #include <sys/dirent.h> 66fa9e4066Sahrens #include <sys/policy.h> 67fa9e4066Sahrens #include <sys/fs/zfs.h> 68fa9e4066Sahrens #include <sys/zfs_ioctl.h> 69fa9e4066Sahrens #include <sys/mkdev.h> 7022ac5be4Sperrin #include <sys/zil.h> 71c5c6ffa0Smaybee #include <sys/refcount.h> 72fa9e4066Sahrens 73fa9e4066Sahrens #include "zfs_namecheck.h" 74fa9e4066Sahrens 75fa9e4066Sahrens #define ZVOL_OBJ 1ULL 76fa9e4066Sahrens #define ZVOL_ZAP_OBJ 2ULL 77fa9e4066Sahrens 78fa9e4066Sahrens static void *zvol_state; 79fa9e4066Sahrens 80fa9e4066Sahrens /* 81fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 82fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 83fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 84fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 85fa9e4066Sahrens */ 86fa9e4066Sahrens static kmutex_t zvol_state_lock; 87fa9e4066Sahrens static uint32_t zvol_minors; 88fa9e4066Sahrens 89fa9e4066Sahrens /* 90fa9e4066Sahrens * The in-core state of each volume. 91fa9e4066Sahrens */ 92fa9e4066Sahrens typedef struct zvol_state { 93fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 94fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 95fa9e4066Sahrens minor_t zv_minor; /* minor number */ 96fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 97fa9e4066Sahrens uint8_t zv_readonly; /* hard readonly; like write-protect */ 98fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 99fa9e4066Sahrens uint32_t zv_mode; /* DS_MODE_* flags at open time */ 100fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 101fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 10222ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 10322ac5be4Sperrin uint64_t zv_txg_assign; /* txg to assign during ZIL replay */ 104a24e15ceSperrin krwlock_t zv_dslock; /* dmu_sync() rwlock */ 105fa9e4066Sahrens } zvol_state_t; 106fa9e4066Sahrens 107fa9e4066Sahrens static void 108fa9e4066Sahrens zvol_size_changed(zvol_state_t *zv, dev_t dev) 109fa9e4066Sahrens { 110fa9e4066Sahrens dev = makedevice(getmajor(dev), zv->zv_minor); 111fa9e4066Sahrens 112fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 113fa9e4066Sahrens "Size", zv->zv_volsize) == DDI_SUCCESS); 114fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 115fa9e4066Sahrens "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); 116fa9e4066Sahrens } 117fa9e4066Sahrens 118fa9e4066Sahrens int 119*e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 120fa9e4066Sahrens { 121*e9dbad6fSeschrock if (volsize == 0) 122fa9e4066Sahrens return (EINVAL); 123fa9e4066Sahrens 124*e9dbad6fSeschrock if (volsize % blocksize != 0) 1255c5460e9Seschrock return (EINVAL); 1265c5460e9Seschrock 127fa9e4066Sahrens #ifdef _ILP32 128*e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 129fa9e4066Sahrens return (EOVERFLOW); 130fa9e4066Sahrens #endif 131fa9e4066Sahrens return (0); 132fa9e4066Sahrens } 133fa9e4066Sahrens 134fa9e4066Sahrens int 135*e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 136fa9e4066Sahrens { 137*e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 138*e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 139*e9dbad6fSeschrock !ISP2(volblocksize)) 140fa9e4066Sahrens return (EDOM); 141fa9e4066Sahrens 142fa9e4066Sahrens return (0); 143fa9e4066Sahrens } 144fa9e4066Sahrens 145fa9e4066Sahrens static void 146fa9e4066Sahrens zvol_readonly_changed_cb(void *arg, uint64_t newval) 147fa9e4066Sahrens { 148fa9e4066Sahrens zvol_state_t *zv = arg; 149fa9e4066Sahrens 150fa9e4066Sahrens zv->zv_readonly = (uint8_t)newval; 151fa9e4066Sahrens } 152fa9e4066Sahrens 153fa9e4066Sahrens int 154*e9dbad6fSeschrock zvol_get_stats(objset_t *os, zvol_stats_t *zvs) 155fa9e4066Sahrens { 156fa9e4066Sahrens int error; 157fa9e4066Sahrens dmu_object_info_t doi; 158fa9e4066Sahrens 159*e9dbad6fSeschrock error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zvs->zv_volsize); 160fa9e4066Sahrens 161fa9e4066Sahrens if (error) 162fa9e4066Sahrens return (error); 163fa9e4066Sahrens 164fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 165fa9e4066Sahrens 166fa9e4066Sahrens if (error == 0) 167*e9dbad6fSeschrock zvs->zv_volblocksize = doi.doi_data_block_size; 168fa9e4066Sahrens 169fa9e4066Sahrens return (error); 170fa9e4066Sahrens } 171fa9e4066Sahrens 172fa9e4066Sahrens /* 173fa9e4066Sahrens * Find a free minor number. 174fa9e4066Sahrens */ 175fa9e4066Sahrens static minor_t 176fa9e4066Sahrens zvol_minor_alloc(void) 177fa9e4066Sahrens { 178fa9e4066Sahrens minor_t minor; 179fa9e4066Sahrens 180fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 181fa9e4066Sahrens 182fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 183fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 184fa9e4066Sahrens return (minor); 185fa9e4066Sahrens 186fa9e4066Sahrens return (0); 187fa9e4066Sahrens } 188fa9e4066Sahrens 189fa9e4066Sahrens static zvol_state_t * 190*e9dbad6fSeschrock zvol_minor_lookup(const char *name) 191fa9e4066Sahrens { 192fa9e4066Sahrens minor_t minor; 193fa9e4066Sahrens zvol_state_t *zv; 194fa9e4066Sahrens 195fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 196fa9e4066Sahrens 197fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 198fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 199fa9e4066Sahrens if (zv == NULL) 200fa9e4066Sahrens continue; 201fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 202fa9e4066Sahrens break; 203fa9e4066Sahrens } 204fa9e4066Sahrens 205fa9e4066Sahrens return (zv); 206fa9e4066Sahrens } 207fa9e4066Sahrens 208fa9e4066Sahrens void 209fa9e4066Sahrens zvol_create_cb(objset_t *os, void *arg, dmu_tx_t *tx) 210fa9e4066Sahrens { 211*e9dbad6fSeschrock zfs_create_data_t *zc = arg; 212fa9e4066Sahrens int error; 213*e9dbad6fSeschrock uint64_t volblocksize, volsize; 214fa9e4066Sahrens 215*e9dbad6fSeschrock VERIFY(nvlist_lookup_uint64(zc->zc_props, 216*e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 217*e9dbad6fSeschrock if (nvlist_lookup_uint64(zc->zc_props, 218*e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 219*e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 220*e9dbad6fSeschrock 221*e9dbad6fSeschrock /* 222*e9dbad6fSeschrock * These properites must be removed from the list so the generic 223*e9dbad6fSeschrock * property setting step won't apply to them. 224*e9dbad6fSeschrock */ 225*e9dbad6fSeschrock VERIFY(nvlist_remove_all(zc->zc_props, 226*e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 227*e9dbad6fSeschrock (void) nvlist_remove_all(zc->zc_props, 228*e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 229*e9dbad6fSeschrock 230*e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 231fa9e4066Sahrens DMU_OT_NONE, 0, tx); 232fa9e4066Sahrens ASSERT(error == 0); 233fa9e4066Sahrens 234fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 235fa9e4066Sahrens DMU_OT_NONE, 0, tx); 236fa9e4066Sahrens ASSERT(error == 0); 237fa9e4066Sahrens 238*e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 239fa9e4066Sahrens ASSERT(error == 0); 240fa9e4066Sahrens } 241fa9e4066Sahrens 24222ac5be4Sperrin /* 24322ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 24422ac5be4Sperrin * after a system failure 24522ac5be4Sperrin */ 24622ac5be4Sperrin static int 24722ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 24822ac5be4Sperrin { 24922ac5be4Sperrin objset_t *os = zv->zv_objset; 25022ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 25122ac5be4Sperrin uint64_t off = lr->lr_offset; 25222ac5be4Sperrin uint64_t len = lr->lr_length; 25322ac5be4Sperrin dmu_tx_t *tx; 25422ac5be4Sperrin int error; 25522ac5be4Sperrin 25622ac5be4Sperrin if (byteswap) 25722ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 25822ac5be4Sperrin 25922ac5be4Sperrin tx = dmu_tx_create(os); 26022ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 26122ac5be4Sperrin error = dmu_tx_assign(tx, zv->zv_txg_assign); 26222ac5be4Sperrin if (error) { 26322ac5be4Sperrin dmu_tx_abort(tx); 26422ac5be4Sperrin } else { 26522ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 26622ac5be4Sperrin dmu_tx_commit(tx); 26722ac5be4Sperrin } 26822ac5be4Sperrin 26922ac5be4Sperrin return (error); 27022ac5be4Sperrin } 27122ac5be4Sperrin 27222ac5be4Sperrin /* ARGSUSED */ 27322ac5be4Sperrin static int 27422ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 27522ac5be4Sperrin { 27622ac5be4Sperrin return (ENOTSUP); 27722ac5be4Sperrin } 27822ac5be4Sperrin 27922ac5be4Sperrin /* 28022ac5be4Sperrin * Callback vectors for replaying records. 28122ac5be4Sperrin * Only TX_WRITE is needed for zvol. 28222ac5be4Sperrin */ 28322ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 28422ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 28522ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 28622ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 28722ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 28822ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 28922ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 29022ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 29122ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 29222ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 29322ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 29422ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 29522ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 29622ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 29722ac5be4Sperrin }; 29822ac5be4Sperrin 299fa9e4066Sahrens /* 300fa9e4066Sahrens * Create a minor node for the specified volume. 301fa9e4066Sahrens */ 302fa9e4066Sahrens int 303*e9dbad6fSeschrock zvol_create_minor(const char *name, dev_t dev) 304fa9e4066Sahrens { 305fa9e4066Sahrens zvol_state_t *zv; 306fa9e4066Sahrens objset_t *os; 307fa9e4066Sahrens uint64_t volsize; 308fa9e4066Sahrens minor_t minor = 0; 309fa9e4066Sahrens struct pathname linkpath; 310fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 311fa9e4066Sahrens vnode_t *vp = NULL; 312fa9e4066Sahrens char *devpath; 313fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 314fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 315fa9e4066Sahrens int error; 316fa9e4066Sahrens 317fa9e4066Sahrens mutex_enter(&zvol_state_lock); 318fa9e4066Sahrens 319fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 320fa9e4066Sahrens mutex_exit(&zvol_state_lock); 321fa9e4066Sahrens return (EEXIST); 322fa9e4066Sahrens } 323fa9e4066Sahrens 324fa9e4066Sahrens if (strchr(name, '@') != 0) 325fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 326fa9e4066Sahrens 327fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 328fa9e4066Sahrens 329fa9e4066Sahrens if (error) { 330fa9e4066Sahrens mutex_exit(&zvol_state_lock); 331fa9e4066Sahrens return (error); 332fa9e4066Sahrens } 333fa9e4066Sahrens 334fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 335fa9e4066Sahrens 336fa9e4066Sahrens if (error) { 337fa9e4066Sahrens dmu_objset_close(os); 338fa9e4066Sahrens mutex_exit(&zvol_state_lock); 339fa9e4066Sahrens return (error); 340fa9e4066Sahrens } 341fa9e4066Sahrens 342fa9e4066Sahrens /* 343fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 344fa9e4066Sahrens * same minor number we used last time. 345fa9e4066Sahrens */ 346fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 347fa9e4066Sahrens 348fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 349fa9e4066Sahrens 350fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 351fa9e4066Sahrens 352fa9e4066Sahrens kmem_free(devpath, devpathlen); 353fa9e4066Sahrens 354fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 355fa9e4066Sahrens error = EINVAL; 356fa9e4066Sahrens 357fa9e4066Sahrens if (error == 0) { 358fa9e4066Sahrens pn_alloc(&linkpath); 359fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 360fa9e4066Sahrens if (error == 0) { 361fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 362fa9e4066Sahrens if (ms != NULL) { 363fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 364fa9e4066Sahrens minor = stoi(&ms); 365fa9e4066Sahrens } 366fa9e4066Sahrens } 367fa9e4066Sahrens pn_free(&linkpath); 368fa9e4066Sahrens } 369fa9e4066Sahrens 370fa9e4066Sahrens if (vp != NULL) 371fa9e4066Sahrens VN_RELE(vp); 372fa9e4066Sahrens 373fa9e4066Sahrens /* 374fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 375fa9e4066Sahrens */ 376fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 377fa9e4066Sahrens minor = 0; 378fa9e4066Sahrens 379fa9e4066Sahrens if (minor == 0) 380fa9e4066Sahrens minor = zvol_minor_alloc(); 381fa9e4066Sahrens 382fa9e4066Sahrens if (minor == 0) { 383fa9e4066Sahrens dmu_objset_close(os); 384fa9e4066Sahrens mutex_exit(&zvol_state_lock); 385fa9e4066Sahrens return (ENXIO); 386fa9e4066Sahrens } 387fa9e4066Sahrens 388fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 389fa9e4066Sahrens dmu_objset_close(os); 390fa9e4066Sahrens mutex_exit(&zvol_state_lock); 391fa9e4066Sahrens return (EAGAIN); 392fa9e4066Sahrens } 393fa9e4066Sahrens 394*e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 395*e9dbad6fSeschrock (char *)name); 396fa9e4066Sahrens 397fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 398fa9e4066Sahrens 399fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 400fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 401fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 402fa9e4066Sahrens dmu_objset_close(os); 403fa9e4066Sahrens mutex_exit(&zvol_state_lock); 404fa9e4066Sahrens return (EAGAIN); 405fa9e4066Sahrens } 406fa9e4066Sahrens 407fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 408fa9e4066Sahrens 409fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 410fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 411fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 412fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 413fa9e4066Sahrens dmu_objset_close(os); 414fa9e4066Sahrens mutex_exit(&zvol_state_lock); 415fa9e4066Sahrens return (EAGAIN); 416fa9e4066Sahrens } 417fa9e4066Sahrens 418fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 419fa9e4066Sahrens 420fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 421fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 422fa9e4066Sahrens zv->zv_minor = minor; 423fa9e4066Sahrens zv->zv_volsize = volsize; 424fa9e4066Sahrens zv->zv_objset = os; 425fa9e4066Sahrens zv->zv_mode = ds_mode; 42622ac5be4Sperrin zv->zv_zilog = zil_open(os, NULL); 42722ac5be4Sperrin 428a24e15ceSperrin rw_init(&zv->zv_dslock, NULL, RW_DEFAULT, NULL); 429a24e15ceSperrin 43022ac5be4Sperrin zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector, NULL); 431fa9e4066Sahrens 432fa9e4066Sahrens zvol_size_changed(zv, dev); 433fa9e4066Sahrens 434ea8dc4b6Seschrock /* XXX this should handle the possible i/o error */ 435fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 436fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 437fa9e4066Sahrens 438fa9e4066Sahrens zvol_minors++; 439fa9e4066Sahrens 440fa9e4066Sahrens mutex_exit(&zvol_state_lock); 441fa9e4066Sahrens 442fa9e4066Sahrens return (0); 443fa9e4066Sahrens } 444fa9e4066Sahrens 445fa9e4066Sahrens /* 446fa9e4066Sahrens * Remove minor node for the specified volume. 447fa9e4066Sahrens */ 448fa9e4066Sahrens int 449*e9dbad6fSeschrock zvol_remove_minor(const char *name) 450fa9e4066Sahrens { 451fa9e4066Sahrens zvol_state_t *zv; 452fa9e4066Sahrens char namebuf[30]; 453fa9e4066Sahrens 454fa9e4066Sahrens mutex_enter(&zvol_state_lock); 455fa9e4066Sahrens 456*e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 457fa9e4066Sahrens mutex_exit(&zvol_state_lock); 458fa9e4066Sahrens return (ENXIO); 459fa9e4066Sahrens } 460fa9e4066Sahrens 461fa9e4066Sahrens if (zv->zv_total_opens != 0) { 462fa9e4066Sahrens mutex_exit(&zvol_state_lock); 463fa9e4066Sahrens return (EBUSY); 464fa9e4066Sahrens } 465fa9e4066Sahrens 466fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 467fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 468fa9e4066Sahrens 469fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 470fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 471fa9e4066Sahrens 472fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 473fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 474fa9e4066Sahrens 47522ac5be4Sperrin zil_close(zv->zv_zilog); 47622ac5be4Sperrin zv->zv_zilog = NULL; 477fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 478fa9e4066Sahrens zv->zv_objset = NULL; 479fa9e4066Sahrens 480fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 481fa9e4066Sahrens 482fa9e4066Sahrens zvol_minors--; 483fa9e4066Sahrens 484fa9e4066Sahrens mutex_exit(&zvol_state_lock); 485fa9e4066Sahrens 486fa9e4066Sahrens return (0); 487fa9e4066Sahrens } 488fa9e4066Sahrens 489fa9e4066Sahrens int 490*e9dbad6fSeschrock zvol_set_volsize(const char *name, dev_t dev, uint64_t volsize) 491fa9e4066Sahrens { 492fa9e4066Sahrens zvol_state_t *zv; 493fa9e4066Sahrens dmu_tx_t *tx; 494fa9e4066Sahrens int error; 4955c5460e9Seschrock dmu_object_info_t doi; 496fa9e4066Sahrens 497fa9e4066Sahrens mutex_enter(&zvol_state_lock); 498fa9e4066Sahrens 499*e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 500fa9e4066Sahrens mutex_exit(&zvol_state_lock); 501fa9e4066Sahrens return (ENXIO); 502fa9e4066Sahrens } 503fa9e4066Sahrens 5045c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 505*e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 506*e9dbad6fSeschrock doi.doi_data_block_size)) != 0) { 5075c5460e9Seschrock mutex_exit(&zvol_state_lock); 5085c5460e9Seschrock return (error); 5095c5460e9Seschrock } 5105c5460e9Seschrock 511fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 512fa9e4066Sahrens mutex_exit(&zvol_state_lock); 513fa9e4066Sahrens return (EROFS); 514fa9e4066Sahrens } 515fa9e4066Sahrens 516fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 517ea8dc4b6Seschrock dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 518*e9dbad6fSeschrock dmu_tx_hold_free(tx, ZVOL_OBJ, volsize, DMU_OBJECT_END); 519fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 520fa9e4066Sahrens if (error) { 521fa9e4066Sahrens dmu_tx_abort(tx); 522fa9e4066Sahrens mutex_exit(&zvol_state_lock); 523fa9e4066Sahrens return (error); 524fa9e4066Sahrens } 525fa9e4066Sahrens 526fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 527*e9dbad6fSeschrock &volsize, tx); 528ea8dc4b6Seschrock if (error == 0) { 529*e9dbad6fSeschrock error = dmu_free_range(zv->zv_objset, ZVOL_OBJ, volsize, 530fa9e4066Sahrens DMU_OBJECT_END, tx); 531ea8dc4b6Seschrock } 532fa9e4066Sahrens 533fa9e4066Sahrens dmu_tx_commit(tx); 534fa9e4066Sahrens 535fa9e4066Sahrens if (error == 0) { 536*e9dbad6fSeschrock zv->zv_volsize = volsize; 537fa9e4066Sahrens zvol_size_changed(zv, dev); 538fa9e4066Sahrens } 539fa9e4066Sahrens 540fa9e4066Sahrens mutex_exit(&zvol_state_lock); 541fa9e4066Sahrens 542fa9e4066Sahrens return (error); 543fa9e4066Sahrens } 544fa9e4066Sahrens 545fa9e4066Sahrens int 546*e9dbad6fSeschrock zvol_set_volblocksize(const char *name, uint64_t volblocksize) 547fa9e4066Sahrens { 548fa9e4066Sahrens zvol_state_t *zv; 549fa9e4066Sahrens dmu_tx_t *tx; 550fa9e4066Sahrens int error; 551fa9e4066Sahrens 552fa9e4066Sahrens mutex_enter(&zvol_state_lock); 553fa9e4066Sahrens 554*e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 555fa9e4066Sahrens mutex_exit(&zvol_state_lock); 556fa9e4066Sahrens return (ENXIO); 557fa9e4066Sahrens } 558fa9e4066Sahrens 559fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 560fa9e4066Sahrens mutex_exit(&zvol_state_lock); 561fa9e4066Sahrens return (EROFS); 562fa9e4066Sahrens } 563fa9e4066Sahrens 564fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 565fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 566fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 567fa9e4066Sahrens if (error) { 568fa9e4066Sahrens dmu_tx_abort(tx); 569fa9e4066Sahrens } else { 570fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 571*e9dbad6fSeschrock volblocksize, 0, tx); 572fa9e4066Sahrens if (error == ENOTSUP) 573fa9e4066Sahrens error = EBUSY; 574fa9e4066Sahrens dmu_tx_commit(tx); 575fa9e4066Sahrens } 576fa9e4066Sahrens 577fa9e4066Sahrens mutex_exit(&zvol_state_lock); 578fa9e4066Sahrens 579fa9e4066Sahrens return (error); 580fa9e4066Sahrens } 581fa9e4066Sahrens 582fa9e4066Sahrens /*ARGSUSED*/ 583fa9e4066Sahrens int 584fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 585fa9e4066Sahrens { 586fa9e4066Sahrens minor_t minor = getminor(*devp); 587fa9e4066Sahrens zvol_state_t *zv; 588fa9e4066Sahrens 589fa9e4066Sahrens if (minor == 0) /* This is the control device */ 590fa9e4066Sahrens return (0); 591fa9e4066Sahrens 592fa9e4066Sahrens mutex_enter(&zvol_state_lock); 593fa9e4066Sahrens 594fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 595fa9e4066Sahrens if (zv == NULL) { 596fa9e4066Sahrens mutex_exit(&zvol_state_lock); 597fa9e4066Sahrens return (ENXIO); 598fa9e4066Sahrens } 599fa9e4066Sahrens 600fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 601fa9e4066Sahrens 602fa9e4066Sahrens if ((flag & FWRITE) && 603fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 604fa9e4066Sahrens mutex_exit(&zvol_state_lock); 605fa9e4066Sahrens return (EROFS); 606fa9e4066Sahrens } 607fa9e4066Sahrens 608fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 609fa9e4066Sahrens zv->zv_open_count[otyp]++; 610fa9e4066Sahrens zv->zv_total_opens++; 611fa9e4066Sahrens } 612fa9e4066Sahrens 613fa9e4066Sahrens mutex_exit(&zvol_state_lock); 614fa9e4066Sahrens 615fa9e4066Sahrens return (0); 616fa9e4066Sahrens } 617fa9e4066Sahrens 618fa9e4066Sahrens /*ARGSUSED*/ 619fa9e4066Sahrens int 620fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 621fa9e4066Sahrens { 622fa9e4066Sahrens minor_t minor = getminor(dev); 623fa9e4066Sahrens zvol_state_t *zv; 624fa9e4066Sahrens 625fa9e4066Sahrens if (minor == 0) /* This is the control device */ 626fa9e4066Sahrens return (0); 627fa9e4066Sahrens 628fa9e4066Sahrens mutex_enter(&zvol_state_lock); 629fa9e4066Sahrens 630fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 631fa9e4066Sahrens if (zv == NULL) { 632fa9e4066Sahrens mutex_exit(&zvol_state_lock); 633fa9e4066Sahrens return (ENXIO); 634fa9e4066Sahrens } 635fa9e4066Sahrens 636fa9e4066Sahrens /* 637fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 638fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 639fa9e4066Sahrens */ 640fa9e4066Sahrens if (zv->zv_total_opens == 0) { 641fa9e4066Sahrens mutex_exit(&zvol_state_lock); 642fa9e4066Sahrens return (0); 643fa9e4066Sahrens } 644fa9e4066Sahrens 645fa9e4066Sahrens /* 646fa9e4066Sahrens * If the open count is zero, this is a spurious close. 647fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 648fa9e4066Sahrens */ 649fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 650fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 651fa9e4066Sahrens 652fa9e4066Sahrens /* 653fa9e4066Sahrens * You may get multiple opens, but only one close. 654fa9e4066Sahrens */ 655fa9e4066Sahrens zv->zv_open_count[otyp]--; 656fa9e4066Sahrens zv->zv_total_opens--; 657fa9e4066Sahrens 658fa9e4066Sahrens mutex_exit(&zvol_state_lock); 659fa9e4066Sahrens 660fa9e4066Sahrens return (0); 661fa9e4066Sahrens } 662fa9e4066Sahrens 66322ac5be4Sperrin /* 664a24e15ceSperrin * Create and return an immediate write ZIL transaction. 665a24e15ceSperrin */ 666a24e15ceSperrin itx_t * 667a24e15ceSperrin zvol_immediate_itx(offset_t off, ssize_t len, char *addr) 668a24e15ceSperrin { 669a24e15ceSperrin itx_t *itx; 670a24e15ceSperrin lr_write_t *lr; 671a24e15ceSperrin 672a24e15ceSperrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + len); 673a24e15ceSperrin lr = (lr_write_t *)&itx->itx_lr; 674a24e15ceSperrin lr->lr_foid = ZVOL_OBJ; 675a24e15ceSperrin lr->lr_offset = off; 676a24e15ceSperrin lr->lr_length = len; 677a24e15ceSperrin lr->lr_blkoff = 0; 678a24e15ceSperrin BP_ZERO(&lr->lr_blkptr); 679a24e15ceSperrin bcopy(addr, (char *)itx + offsetof(itx_t, itx_lr) + 680a24e15ceSperrin sizeof (*lr), len); 681a24e15ceSperrin itx->itx_wr_state = WR_COPIED; 682a24e15ceSperrin return (itx); 683a24e15ceSperrin } 684a24e15ceSperrin 685a24e15ceSperrin /* 686a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 68722ac5be4Sperrin * 68822ac5be4Sperrin * We store data in the log buffers if it's small enough. 68922ac5be4Sperrin * Otherwise we flush the data out via dmu_sync(). 69022ac5be4Sperrin */ 69122ac5be4Sperrin ssize_t zvol_immediate_write_sz = 65536; 69222ac5be4Sperrin 69322ac5be4Sperrin int 69422ac5be4Sperrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len, 69522ac5be4Sperrin char *addr) 69622ac5be4Sperrin { 697a24e15ceSperrin dmu_object_info_t doi; 698a24e15ceSperrin ssize_t nbytes; 69922ac5be4Sperrin itx_t *itx; 70022ac5be4Sperrin lr_write_t *lr; 701a24e15ceSperrin objset_t *os; 702c5c6ffa0Smaybee dmu_buf_t *db; 703a24e15ceSperrin uint64_t txg; 704c5c6ffa0Smaybee uint64_t boff; 70522ac5be4Sperrin int error; 706a24e15ceSperrin uint32_t blocksize; 70722ac5be4Sperrin 708a24e15ceSperrin /* handle common case */ 709a24e15ceSperrin if (len <= zvol_immediate_write_sz) { 710a24e15ceSperrin itx = zvol_immediate_itx(off, len, addr); 711a24e15ceSperrin (void) zil_itx_assign(zv->zv_zilog, itx, tx); 712a24e15ceSperrin return (0); 713a24e15ceSperrin } 714a24e15ceSperrin 715a24e15ceSperrin txg = dmu_tx_get_txg(tx); 716a24e15ceSperrin os = zv->zv_objset; 71722ac5be4Sperrin 71822ac5be4Sperrin /* 719a24e15ceSperrin * We need to dmu_sync() each block in the range. 720a24e15ceSperrin * For this we need the blocksize. 72122ac5be4Sperrin */ 722a24e15ceSperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 723a24e15ceSperrin if (error) 724a24e15ceSperrin return (error); 725a24e15ceSperrin blocksize = doi.doi_data_block_size; 726a24e15ceSperrin 727a24e15ceSperrin /* 728a24e15ceSperrin * We need to immediate write or dmu_sync() each block in the range. 729a24e15ceSperrin */ 730a24e15ceSperrin while (len) { 731a24e15ceSperrin nbytes = MIN(len, blocksize - P2PHASE(off, blocksize)); 732a24e15ceSperrin if (nbytes <= zvol_immediate_write_sz) { 733a24e15ceSperrin itx = zvol_immediate_itx(off, nbytes, addr); 734a24e15ceSperrin } else { 735c5c6ffa0Smaybee boff = P2ALIGN_TYPED(off, blocksize, uint64_t); 736a24e15ceSperrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 737a24e15ceSperrin lr = (lr_write_t *)&itx->itx_lr; 738a24e15ceSperrin lr->lr_foid = ZVOL_OBJ; 739a24e15ceSperrin lr->lr_offset = off; 740a24e15ceSperrin lr->lr_length = nbytes; 741c5c6ffa0Smaybee lr->lr_blkoff = off - boff; 742a24e15ceSperrin BP_ZERO(&lr->lr_blkptr); 743a24e15ceSperrin 744c5c6ffa0Smaybee /* XXX - we should do these IOs in parallel */ 745c5c6ffa0Smaybee VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, boff, 746c5c6ffa0Smaybee FTAG, &db)); 747c5c6ffa0Smaybee ASSERT(boff == db->db_offset); 748c5c6ffa0Smaybee error = dmu_sync(NULL, db, &lr->lr_blkptr, 749c5c6ffa0Smaybee txg, NULL, NULL); 750c5c6ffa0Smaybee dmu_buf_rele(db, FTAG); 751a24e15ceSperrin if (error) { 752a24e15ceSperrin kmem_free(itx, offsetof(itx_t, itx_lr)); 753a24e15ceSperrin return (error); 754a24e15ceSperrin } 755a24e15ceSperrin itx->itx_wr_state = WR_COPIED; 75622ac5be4Sperrin } 757a24e15ceSperrin (void) zil_itx_assign(zv->zv_zilog, itx, tx); 758a24e15ceSperrin len -= nbytes; 759a24e15ceSperrin off += nbytes; 76022ac5be4Sperrin } 76122ac5be4Sperrin return (0); 76222ac5be4Sperrin } 76322ac5be4Sperrin 764fa9e4066Sahrens int 765fa9e4066Sahrens zvol_strategy(buf_t *bp) 766fa9e4066Sahrens { 767fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 768fa9e4066Sahrens uint64_t off, volsize; 769fa9e4066Sahrens size_t size, resid; 770fa9e4066Sahrens char *addr; 77122ac5be4Sperrin objset_t *os; 772fa9e4066Sahrens int error = 0; 77322ac5be4Sperrin int sync; 774a24e15ceSperrin int reading; 775a24e15ceSperrin int txg_sync_needed = B_FALSE; 776fa9e4066Sahrens 777fa9e4066Sahrens if (zv == NULL) { 778fa9e4066Sahrens bioerror(bp, ENXIO); 779fa9e4066Sahrens biodone(bp); 780fa9e4066Sahrens return (0); 781fa9e4066Sahrens } 782fa9e4066Sahrens 783fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 784fa9e4066Sahrens bioerror(bp, EINVAL); 785fa9e4066Sahrens biodone(bp); 786fa9e4066Sahrens return (0); 787fa9e4066Sahrens } 788fa9e4066Sahrens 789fa9e4066Sahrens if (zv->zv_readonly && !(bp->b_flags & B_READ)) { 790fa9e4066Sahrens bioerror(bp, EROFS); 791fa9e4066Sahrens biodone(bp); 792fa9e4066Sahrens return (0); 793fa9e4066Sahrens } 794fa9e4066Sahrens 795fa9e4066Sahrens off = ldbtob(bp->b_blkno); 796fa9e4066Sahrens volsize = zv->zv_volsize; 797fa9e4066Sahrens 79822ac5be4Sperrin os = zv->zv_objset; 79922ac5be4Sperrin ASSERT(os != NULL); 80022ac5be4Sperrin sync = !(bp->b_flags & B_ASYNC) && !(zil_disable); 801fa9e4066Sahrens 802fa9e4066Sahrens bp_mapin(bp); 803fa9e4066Sahrens addr = bp->b_un.b_addr; 804fa9e4066Sahrens resid = bp->b_bcount; 805fa9e4066Sahrens 806a24e15ceSperrin /* 807a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 808a24e15ceSperrin * we can't change the data whilst calculating the checksum. 809a24e15ceSperrin * A better approach than a per zvol rwlock would be to lock ranges. 810a24e15ceSperrin */ 811a24e15ceSperrin reading = bp->b_flags & B_READ; 812a24e15ceSperrin if (reading || resid <= zvol_immediate_write_sz) 813a24e15ceSperrin rw_enter(&zv->zv_dslock, RW_READER); 814a24e15ceSperrin else 815a24e15ceSperrin rw_enter(&zv->zv_dslock, RW_WRITER); 816a24e15ceSperrin 817fa9e4066Sahrens while (resid != 0 && off < volsize) { 818fa9e4066Sahrens 819fa9e4066Sahrens size = MIN(resid, 1UL << 20); /* cap at 1MB per tx */ 820fa9e4066Sahrens 821fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 822fa9e4066Sahrens size = volsize - off; 823fa9e4066Sahrens 824a24e15ceSperrin if (reading) { 825a24e15ceSperrin error = dmu_read(os, ZVOL_OBJ, off, size, addr); 826fa9e4066Sahrens } else { 82722ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 828fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 829fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 830fa9e4066Sahrens if (error) { 831fa9e4066Sahrens dmu_tx_abort(tx); 832fa9e4066Sahrens } else { 83322ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 83422ac5be4Sperrin if (sync) { 83522ac5be4Sperrin /* use the ZIL to commit this write */ 836a24e15ceSperrin if (zvol_log_write(zv, tx, off, size, 837a24e15ceSperrin addr) != 0) { 838a24e15ceSperrin txg_sync_needed = B_TRUE; 83922ac5be4Sperrin } 84022ac5be4Sperrin } 841fa9e4066Sahrens dmu_tx_commit(tx); 842fa9e4066Sahrens } 843fa9e4066Sahrens } 844fa9e4066Sahrens if (error) 845fa9e4066Sahrens break; 846fa9e4066Sahrens off += size; 847fa9e4066Sahrens addr += size; 848fa9e4066Sahrens resid -= size; 849fa9e4066Sahrens } 850a24e15ceSperrin rw_exit(&zv->zv_dslock); 851fa9e4066Sahrens 852fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 853fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 854fa9e4066Sahrens 855fa9e4066Sahrens biodone(bp); 85622ac5be4Sperrin 857a24e15ceSperrin if (sync) { 858a24e15ceSperrin if (txg_sync_needed) 859a24e15ceSperrin txg_wait_synced(dmu_objset_pool(os), 0); 860a24e15ceSperrin else 861b19a79ecSperrin zil_commit(zv->zv_zilog, UINT64_MAX, 0); 862a24e15ceSperrin } 86322ac5be4Sperrin 864fa9e4066Sahrens return (0); 865fa9e4066Sahrens } 866fa9e4066Sahrens 867fa9e4066Sahrens /*ARGSUSED*/ 868fa9e4066Sahrens int 869fa9e4066Sahrens zvol_read(dev_t dev, uio_t *uiop, cred_t *cr) 870fa9e4066Sahrens { 871fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_READ, minphys, uiop)); 872fa9e4066Sahrens } 873fa9e4066Sahrens 874fa9e4066Sahrens /*ARGSUSED*/ 875fa9e4066Sahrens int 876fa9e4066Sahrens zvol_write(dev_t dev, uio_t *uiop, cred_t *cr) 877fa9e4066Sahrens { 878fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_WRITE, minphys, uiop)); 879fa9e4066Sahrens } 880fa9e4066Sahrens 881fa9e4066Sahrens /*ARGSUSED*/ 882fa9e4066Sahrens int 883fa9e4066Sahrens zvol_aread(dev_t dev, struct aio_req *aio, cred_t *cr) 884fa9e4066Sahrens { 885fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_READ, minphys, aio)); 886fa9e4066Sahrens } 887fa9e4066Sahrens 888fa9e4066Sahrens /*ARGSUSED*/ 889fa9e4066Sahrens int 890fa9e4066Sahrens zvol_awrite(dev_t dev, struct aio_req *aio, cred_t *cr) 891fa9e4066Sahrens { 892fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_WRITE, minphys, aio)); 893fa9e4066Sahrens } 894fa9e4066Sahrens 895fa9e4066Sahrens /* 896fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 897fa9e4066Sahrens */ 898fa9e4066Sahrens /*ARGSUSED*/ 899fa9e4066Sahrens int 900fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 901fa9e4066Sahrens { 902fa9e4066Sahrens zvol_state_t *zv; 903fa9e4066Sahrens struct dk_cinfo dkc; 904fa9e4066Sahrens struct dk_minfo dkm; 905fa9e4066Sahrens dk_efi_t efi; 906fa9e4066Sahrens efi_gpt_t gpt; 907fa9e4066Sahrens efi_gpe_t gpe; 908fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 909fa9e4066Sahrens uint32_t crc; 910fa9e4066Sahrens int error = 0; 911fa9e4066Sahrens 912fa9e4066Sahrens mutex_enter(&zvol_state_lock); 913fa9e4066Sahrens 914fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 915fa9e4066Sahrens 916fa9e4066Sahrens if (zv == NULL) { 917fa9e4066Sahrens mutex_exit(&zvol_state_lock); 918fa9e4066Sahrens return (ENXIO); 919fa9e4066Sahrens } 920fa9e4066Sahrens 921fa9e4066Sahrens switch (cmd) { 922fa9e4066Sahrens 923fa9e4066Sahrens case DKIOCINFO: 924fa9e4066Sahrens bzero(&dkc, sizeof (dkc)); 925fa9e4066Sahrens (void) strcpy(dkc.dki_cname, "zvol"); 926fa9e4066Sahrens (void) strcpy(dkc.dki_dname, "zvol"); 927fa9e4066Sahrens dkc.dki_ctype = DKC_UNKNOWN; 9288f8be083Sbonwick dkc.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 929fa9e4066Sahrens mutex_exit(&zvol_state_lock); 930fa9e4066Sahrens if (ddi_copyout(&dkc, (void *)arg, sizeof (dkc), flag)) 931fa9e4066Sahrens error = EFAULT; 932fa9e4066Sahrens return (error); 933fa9e4066Sahrens 934fa9e4066Sahrens case DKIOCGMEDIAINFO: 935fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 936fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 937fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 938fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 939fa9e4066Sahrens mutex_exit(&zvol_state_lock); 940fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 941fa9e4066Sahrens error = EFAULT; 942fa9e4066Sahrens return (error); 943fa9e4066Sahrens 944fa9e4066Sahrens case DKIOCGETEFI: 945fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 946fa9e4066Sahrens mutex_exit(&zvol_state_lock); 947fa9e4066Sahrens return (EFAULT); 948fa9e4066Sahrens } 949fa9e4066Sahrens 950fa9e4066Sahrens bzero(&gpt, sizeof (gpt)); 951fa9e4066Sahrens bzero(&gpe, sizeof (gpe)); 952fa9e4066Sahrens 953fa9e4066Sahrens efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 954fa9e4066Sahrens 955fa9e4066Sahrens if (efi.dki_length < sizeof (gpt) + sizeof (gpe)) { 956fa9e4066Sahrens mutex_exit(&zvol_state_lock); 957fa9e4066Sahrens return (EINVAL); 958fa9e4066Sahrens } 959fa9e4066Sahrens 960fa9e4066Sahrens efi.dki_length = sizeof (gpt) + sizeof (gpe); 961fa9e4066Sahrens 962fa9e4066Sahrens gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 9635c5460e9Seschrock gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 964fa9e4066Sahrens gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 965fa9e4066Sahrens gpt.efi_gpt_FirstUsableLBA = LE_64(0ULL); 966fa9e4066Sahrens gpt.efi_gpt_LastUsableLBA = 967fa9e4066Sahrens LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 968fa9e4066Sahrens gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 969fa9e4066Sahrens gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 970fa9e4066Sahrens 971fa9e4066Sahrens UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 972fa9e4066Sahrens gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 973fa9e4066Sahrens gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 974fa9e4066Sahrens 975fa9e4066Sahrens CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 976fa9e4066Sahrens gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 977fa9e4066Sahrens 978fa9e4066Sahrens CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 979fa9e4066Sahrens gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 980fa9e4066Sahrens 981fa9e4066Sahrens mutex_exit(&zvol_state_lock); 982fa9e4066Sahrens if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag) || 983fa9e4066Sahrens ddi_copyout(&gpe, efi.dki_data + 1, sizeof (gpe), flag)) 984fa9e4066Sahrens error = EFAULT; 985fa9e4066Sahrens return (error); 986fa9e4066Sahrens 987fa9e4066Sahrens default: 988fa9e4066Sahrens error = ENOTSUP; 989fa9e4066Sahrens break; 990fa9e4066Sahrens 991fa9e4066Sahrens } 992fa9e4066Sahrens mutex_exit(&zvol_state_lock); 993fa9e4066Sahrens return (error); 994fa9e4066Sahrens } 995fa9e4066Sahrens 996fa9e4066Sahrens int 997fa9e4066Sahrens zvol_busy(void) 998fa9e4066Sahrens { 999fa9e4066Sahrens return (zvol_minors != 0); 1000fa9e4066Sahrens } 1001fa9e4066Sahrens 1002fa9e4066Sahrens void 1003fa9e4066Sahrens zvol_init(void) 1004fa9e4066Sahrens { 1005fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1006fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1007fa9e4066Sahrens } 1008fa9e4066Sahrens 1009fa9e4066Sahrens void 1010fa9e4066Sahrens zvol_fini(void) 1011fa9e4066Sahrens { 1012fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1013fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1014fa9e4066Sahrens } 1015