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> 71*c5c6ffa0Smaybee #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 1195c5460e9Seschrock zvol_check_volsize(zfs_cmd_t *zc, uint64_t blocksize) 120fa9e4066Sahrens { 121fa9e4066Sahrens if (zc->zc_volsize == 0) 122fa9e4066Sahrens return (EINVAL); 123fa9e4066Sahrens 1245c5460e9Seschrock if (zc->zc_volsize % blocksize != 0) 1255c5460e9Seschrock return (EINVAL); 1265c5460e9Seschrock 127fa9e4066Sahrens #ifdef _ILP32 128fa9e4066Sahrens if (zc->zc_volsize - 1 > SPEC_MAXOFFSET_T) 129fa9e4066Sahrens return (EOVERFLOW); 130fa9e4066Sahrens #endif 131fa9e4066Sahrens return (0); 132fa9e4066Sahrens } 133fa9e4066Sahrens 134fa9e4066Sahrens int 135fa9e4066Sahrens zvol_check_volblocksize(zfs_cmd_t *zc) 136fa9e4066Sahrens { 137fa9e4066Sahrens if (zc->zc_volblocksize < SPA_MINBLOCKSIZE || 138fa9e4066Sahrens zc->zc_volblocksize > SPA_MAXBLOCKSIZE || 139fa9e4066Sahrens !ISP2(zc->zc_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 154fa9e4066Sahrens zvol_get_stats(zfs_cmd_t *zc, objset_t *os) 155fa9e4066Sahrens { 156fa9e4066Sahrens int error; 157fa9e4066Sahrens dmu_object_info_t doi; 158fa9e4066Sahrens 159fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize); 160fa9e4066Sahrens 161fa9e4066Sahrens if (error) 162fa9e4066Sahrens return (error); 163fa9e4066Sahrens 164fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 165fa9e4066Sahrens 166fa9e4066Sahrens if (error == 0) 167fa9e4066Sahrens zc->zc_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 * 190fa9e4066Sahrens zvol_minor_lookup(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 { 211fa9e4066Sahrens zfs_cmd_t *zc = arg; 212fa9e4066Sahrens int error; 213fa9e4066Sahrens 214fa9e4066Sahrens error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, zc->zc_volblocksize, 215fa9e4066Sahrens DMU_OT_NONE, 0, tx); 216fa9e4066Sahrens ASSERT(error == 0); 217fa9e4066Sahrens 218fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 219fa9e4066Sahrens DMU_OT_NONE, 0, tx); 220fa9e4066Sahrens ASSERT(error == 0); 221fa9e4066Sahrens 222fa9e4066Sahrens error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize, tx); 223fa9e4066Sahrens ASSERT(error == 0); 224fa9e4066Sahrens } 225fa9e4066Sahrens 22622ac5be4Sperrin /* 22722ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 22822ac5be4Sperrin * after a system failure 22922ac5be4Sperrin */ 23022ac5be4Sperrin static int 23122ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 23222ac5be4Sperrin { 23322ac5be4Sperrin objset_t *os = zv->zv_objset; 23422ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 23522ac5be4Sperrin uint64_t off = lr->lr_offset; 23622ac5be4Sperrin uint64_t len = lr->lr_length; 23722ac5be4Sperrin dmu_tx_t *tx; 23822ac5be4Sperrin int error; 23922ac5be4Sperrin 24022ac5be4Sperrin if (byteswap) 24122ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 24222ac5be4Sperrin 24322ac5be4Sperrin tx = dmu_tx_create(os); 24422ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 24522ac5be4Sperrin error = dmu_tx_assign(tx, zv->zv_txg_assign); 24622ac5be4Sperrin if (error) { 24722ac5be4Sperrin dmu_tx_abort(tx); 24822ac5be4Sperrin } else { 24922ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 25022ac5be4Sperrin dmu_tx_commit(tx); 25122ac5be4Sperrin } 25222ac5be4Sperrin 25322ac5be4Sperrin return (error); 25422ac5be4Sperrin } 25522ac5be4Sperrin 25622ac5be4Sperrin /* ARGSUSED */ 25722ac5be4Sperrin static int 25822ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 25922ac5be4Sperrin { 26022ac5be4Sperrin return (ENOTSUP); 26122ac5be4Sperrin } 26222ac5be4Sperrin 26322ac5be4Sperrin /* 26422ac5be4Sperrin * Callback vectors for replaying records. 26522ac5be4Sperrin * Only TX_WRITE is needed for zvol. 26622ac5be4Sperrin */ 26722ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 26822ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 26922ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 27022ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 27122ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 27222ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 27322ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 27422ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 27522ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 27622ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 27722ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 27822ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 27922ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 28022ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 28122ac5be4Sperrin }; 28222ac5be4Sperrin 283fa9e4066Sahrens /* 284fa9e4066Sahrens * Create a minor node for the specified volume. 285fa9e4066Sahrens */ 286fa9e4066Sahrens int 287fa9e4066Sahrens zvol_create_minor(zfs_cmd_t *zc) 288fa9e4066Sahrens { 289fa9e4066Sahrens char *name = zc->zc_name; 290fa9e4066Sahrens dev_t dev = zc->zc_dev; 291fa9e4066Sahrens zvol_state_t *zv; 292fa9e4066Sahrens objset_t *os; 293fa9e4066Sahrens uint64_t volsize; 294fa9e4066Sahrens minor_t minor = 0; 295fa9e4066Sahrens struct pathname linkpath; 296fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 297fa9e4066Sahrens vnode_t *vp = NULL; 298fa9e4066Sahrens char *devpath; 299fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 300fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 301fa9e4066Sahrens int error; 302fa9e4066Sahrens 303fa9e4066Sahrens mutex_enter(&zvol_state_lock); 304fa9e4066Sahrens 305fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 306fa9e4066Sahrens mutex_exit(&zvol_state_lock); 307fa9e4066Sahrens return (EEXIST); 308fa9e4066Sahrens } 309fa9e4066Sahrens 310fa9e4066Sahrens if (strchr(name, '@') != 0) 311fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 312fa9e4066Sahrens 313fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 314fa9e4066Sahrens 315fa9e4066Sahrens if (error) { 316fa9e4066Sahrens mutex_exit(&zvol_state_lock); 317fa9e4066Sahrens return (error); 318fa9e4066Sahrens } 319fa9e4066Sahrens 320fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 321fa9e4066Sahrens 322fa9e4066Sahrens if (error) { 323fa9e4066Sahrens dmu_objset_close(os); 324fa9e4066Sahrens mutex_exit(&zvol_state_lock); 325fa9e4066Sahrens return (error); 326fa9e4066Sahrens } 327fa9e4066Sahrens 328fa9e4066Sahrens /* 329fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 330fa9e4066Sahrens * same minor number we used last time. 331fa9e4066Sahrens */ 332fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 333fa9e4066Sahrens 334fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 335fa9e4066Sahrens 336fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 337fa9e4066Sahrens 338fa9e4066Sahrens kmem_free(devpath, devpathlen); 339fa9e4066Sahrens 340fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 341fa9e4066Sahrens error = EINVAL; 342fa9e4066Sahrens 343fa9e4066Sahrens if (error == 0) { 344fa9e4066Sahrens pn_alloc(&linkpath); 345fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 346fa9e4066Sahrens if (error == 0) { 347fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 348fa9e4066Sahrens if (ms != NULL) { 349fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 350fa9e4066Sahrens minor = stoi(&ms); 351fa9e4066Sahrens } 352fa9e4066Sahrens } 353fa9e4066Sahrens pn_free(&linkpath); 354fa9e4066Sahrens } 355fa9e4066Sahrens 356fa9e4066Sahrens if (vp != NULL) 357fa9e4066Sahrens VN_RELE(vp); 358fa9e4066Sahrens 359fa9e4066Sahrens /* 360fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 361fa9e4066Sahrens */ 362fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 363fa9e4066Sahrens minor = 0; 364fa9e4066Sahrens 365fa9e4066Sahrens if (minor == 0) 366fa9e4066Sahrens minor = zvol_minor_alloc(); 367fa9e4066Sahrens 368fa9e4066Sahrens if (minor == 0) { 369fa9e4066Sahrens dmu_objset_close(os); 370fa9e4066Sahrens mutex_exit(&zvol_state_lock); 371fa9e4066Sahrens return (ENXIO); 372fa9e4066Sahrens } 373fa9e4066Sahrens 374fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 375fa9e4066Sahrens dmu_objset_close(os); 376fa9e4066Sahrens mutex_exit(&zvol_state_lock); 377fa9e4066Sahrens return (EAGAIN); 378fa9e4066Sahrens } 379fa9e4066Sahrens 380fa9e4066Sahrens (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, name); 381fa9e4066Sahrens 382fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 383fa9e4066Sahrens 384fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 385fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 386fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 387fa9e4066Sahrens dmu_objset_close(os); 388fa9e4066Sahrens mutex_exit(&zvol_state_lock); 389fa9e4066Sahrens return (EAGAIN); 390fa9e4066Sahrens } 391fa9e4066Sahrens 392fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 393fa9e4066Sahrens 394fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 395fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 396fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 397fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 398fa9e4066Sahrens dmu_objset_close(os); 399fa9e4066Sahrens mutex_exit(&zvol_state_lock); 400fa9e4066Sahrens return (EAGAIN); 401fa9e4066Sahrens } 402fa9e4066Sahrens 403fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 404fa9e4066Sahrens 405fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 406fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 407fa9e4066Sahrens zv->zv_minor = minor; 408fa9e4066Sahrens zv->zv_volsize = volsize; 409fa9e4066Sahrens zv->zv_objset = os; 410fa9e4066Sahrens zv->zv_mode = ds_mode; 41122ac5be4Sperrin zv->zv_zilog = zil_open(os, NULL); 41222ac5be4Sperrin 413a24e15ceSperrin rw_init(&zv->zv_dslock, NULL, RW_DEFAULT, NULL); 414a24e15ceSperrin 41522ac5be4Sperrin zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector, NULL); 416fa9e4066Sahrens 417fa9e4066Sahrens zvol_size_changed(zv, dev); 418fa9e4066Sahrens 419ea8dc4b6Seschrock /* XXX this should handle the possible i/o error */ 420fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 421fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 422fa9e4066Sahrens 423fa9e4066Sahrens zvol_minors++; 424fa9e4066Sahrens 425fa9e4066Sahrens mutex_exit(&zvol_state_lock); 426fa9e4066Sahrens 427fa9e4066Sahrens return (0); 428fa9e4066Sahrens } 429fa9e4066Sahrens 430fa9e4066Sahrens /* 431fa9e4066Sahrens * Remove minor node for the specified volume. 432fa9e4066Sahrens */ 433fa9e4066Sahrens int 434fa9e4066Sahrens zvol_remove_minor(zfs_cmd_t *zc) 435fa9e4066Sahrens { 436fa9e4066Sahrens zvol_state_t *zv; 437fa9e4066Sahrens char namebuf[30]; 438fa9e4066Sahrens 439fa9e4066Sahrens mutex_enter(&zvol_state_lock); 440fa9e4066Sahrens 441fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 442fa9e4066Sahrens mutex_exit(&zvol_state_lock); 443fa9e4066Sahrens return (ENXIO); 444fa9e4066Sahrens } 445fa9e4066Sahrens 446fa9e4066Sahrens if (zv->zv_total_opens != 0) { 447fa9e4066Sahrens mutex_exit(&zvol_state_lock); 448fa9e4066Sahrens return (EBUSY); 449fa9e4066Sahrens } 450fa9e4066Sahrens 451fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 452fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 453fa9e4066Sahrens 454fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 455fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 456fa9e4066Sahrens 457fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 458fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 459fa9e4066Sahrens 46022ac5be4Sperrin zil_close(zv->zv_zilog); 46122ac5be4Sperrin zv->zv_zilog = NULL; 462fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 463fa9e4066Sahrens zv->zv_objset = NULL; 464fa9e4066Sahrens 465fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 466fa9e4066Sahrens 467fa9e4066Sahrens zvol_minors--; 468fa9e4066Sahrens 469fa9e4066Sahrens mutex_exit(&zvol_state_lock); 470fa9e4066Sahrens 471fa9e4066Sahrens return (0); 472fa9e4066Sahrens } 473fa9e4066Sahrens 474fa9e4066Sahrens int 475fa9e4066Sahrens zvol_set_volsize(zfs_cmd_t *zc) 476fa9e4066Sahrens { 477fa9e4066Sahrens zvol_state_t *zv; 478fa9e4066Sahrens dev_t dev = zc->zc_dev; 479fa9e4066Sahrens dmu_tx_t *tx; 480fa9e4066Sahrens int error; 4815c5460e9Seschrock dmu_object_info_t doi; 482fa9e4066Sahrens 483fa9e4066Sahrens mutex_enter(&zvol_state_lock); 484fa9e4066Sahrens 485fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 486fa9e4066Sahrens mutex_exit(&zvol_state_lock); 487fa9e4066Sahrens return (ENXIO); 488fa9e4066Sahrens } 489fa9e4066Sahrens 4905c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 4915c5460e9Seschrock (error = zvol_check_volsize(zc, doi.doi_data_block_size)) != 0) { 4925c5460e9Seschrock mutex_exit(&zvol_state_lock); 4935c5460e9Seschrock return (error); 4945c5460e9Seschrock } 4955c5460e9Seschrock 496fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 497fa9e4066Sahrens mutex_exit(&zvol_state_lock); 498fa9e4066Sahrens return (EROFS); 499fa9e4066Sahrens } 500fa9e4066Sahrens 501fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 502ea8dc4b6Seschrock dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 503fa9e4066Sahrens dmu_tx_hold_free(tx, ZVOL_OBJ, zc->zc_volsize, DMU_OBJECT_END); 504fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 505fa9e4066Sahrens if (error) { 506fa9e4066Sahrens dmu_tx_abort(tx); 507fa9e4066Sahrens mutex_exit(&zvol_state_lock); 508fa9e4066Sahrens return (error); 509fa9e4066Sahrens } 510fa9e4066Sahrens 511fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 512fa9e4066Sahrens &zc->zc_volsize, tx); 513ea8dc4b6Seschrock if (error == 0) { 514ea8dc4b6Seschrock error = dmu_free_range(zv->zv_objset, ZVOL_OBJ, zc->zc_volsize, 515fa9e4066Sahrens DMU_OBJECT_END, tx); 516ea8dc4b6Seschrock } 517fa9e4066Sahrens 518fa9e4066Sahrens dmu_tx_commit(tx); 519fa9e4066Sahrens 520fa9e4066Sahrens if (error == 0) { 521fa9e4066Sahrens zv->zv_volsize = zc->zc_volsize; 522fa9e4066Sahrens zvol_size_changed(zv, dev); 523fa9e4066Sahrens } 524fa9e4066Sahrens 525fa9e4066Sahrens mutex_exit(&zvol_state_lock); 526fa9e4066Sahrens 527fa9e4066Sahrens return (error); 528fa9e4066Sahrens } 529fa9e4066Sahrens 530fa9e4066Sahrens int 531fa9e4066Sahrens zvol_set_volblocksize(zfs_cmd_t *zc) 532fa9e4066Sahrens { 533fa9e4066Sahrens zvol_state_t *zv; 534fa9e4066Sahrens dmu_tx_t *tx; 535fa9e4066Sahrens int error; 536fa9e4066Sahrens 537fa9e4066Sahrens mutex_enter(&zvol_state_lock); 538fa9e4066Sahrens 539fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 540fa9e4066Sahrens mutex_exit(&zvol_state_lock); 541fa9e4066Sahrens return (ENXIO); 542fa9e4066Sahrens } 543fa9e4066Sahrens 544fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 545fa9e4066Sahrens mutex_exit(&zvol_state_lock); 546fa9e4066Sahrens return (EROFS); 547fa9e4066Sahrens } 548fa9e4066Sahrens 549fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 550fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 551fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 552fa9e4066Sahrens if (error) { 553fa9e4066Sahrens dmu_tx_abort(tx); 554fa9e4066Sahrens } else { 555fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 556fa9e4066Sahrens zc->zc_volblocksize, 0, tx); 557fa9e4066Sahrens if (error == ENOTSUP) 558fa9e4066Sahrens error = EBUSY; 559fa9e4066Sahrens dmu_tx_commit(tx); 560fa9e4066Sahrens } 561fa9e4066Sahrens 562fa9e4066Sahrens mutex_exit(&zvol_state_lock); 563fa9e4066Sahrens 564fa9e4066Sahrens return (error); 565fa9e4066Sahrens } 566fa9e4066Sahrens 567fa9e4066Sahrens /*ARGSUSED*/ 568fa9e4066Sahrens int 569fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 570fa9e4066Sahrens { 571fa9e4066Sahrens minor_t minor = getminor(*devp); 572fa9e4066Sahrens zvol_state_t *zv; 573fa9e4066Sahrens 574fa9e4066Sahrens if (minor == 0) /* This is the control device */ 575fa9e4066Sahrens return (0); 576fa9e4066Sahrens 577fa9e4066Sahrens mutex_enter(&zvol_state_lock); 578fa9e4066Sahrens 579fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 580fa9e4066Sahrens if (zv == NULL) { 581fa9e4066Sahrens mutex_exit(&zvol_state_lock); 582fa9e4066Sahrens return (ENXIO); 583fa9e4066Sahrens } 584fa9e4066Sahrens 585fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 586fa9e4066Sahrens 587fa9e4066Sahrens if ((flag & FWRITE) && 588fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 589fa9e4066Sahrens mutex_exit(&zvol_state_lock); 590fa9e4066Sahrens return (EROFS); 591fa9e4066Sahrens } 592fa9e4066Sahrens 593fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 594fa9e4066Sahrens zv->zv_open_count[otyp]++; 595fa9e4066Sahrens zv->zv_total_opens++; 596fa9e4066Sahrens } 597fa9e4066Sahrens 598fa9e4066Sahrens mutex_exit(&zvol_state_lock); 599fa9e4066Sahrens 600fa9e4066Sahrens return (0); 601fa9e4066Sahrens } 602fa9e4066Sahrens 603fa9e4066Sahrens /*ARGSUSED*/ 604fa9e4066Sahrens int 605fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 606fa9e4066Sahrens { 607fa9e4066Sahrens minor_t minor = getminor(dev); 608fa9e4066Sahrens zvol_state_t *zv; 609fa9e4066Sahrens 610fa9e4066Sahrens if (minor == 0) /* This is the control device */ 611fa9e4066Sahrens return (0); 612fa9e4066Sahrens 613fa9e4066Sahrens mutex_enter(&zvol_state_lock); 614fa9e4066Sahrens 615fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 616fa9e4066Sahrens if (zv == NULL) { 617fa9e4066Sahrens mutex_exit(&zvol_state_lock); 618fa9e4066Sahrens return (ENXIO); 619fa9e4066Sahrens } 620fa9e4066Sahrens 621fa9e4066Sahrens /* 622fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 623fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 624fa9e4066Sahrens */ 625fa9e4066Sahrens if (zv->zv_total_opens == 0) { 626fa9e4066Sahrens mutex_exit(&zvol_state_lock); 627fa9e4066Sahrens return (0); 628fa9e4066Sahrens } 629fa9e4066Sahrens 630fa9e4066Sahrens /* 631fa9e4066Sahrens * If the open count is zero, this is a spurious close. 632fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 633fa9e4066Sahrens */ 634fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 635fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 636fa9e4066Sahrens 637fa9e4066Sahrens /* 638fa9e4066Sahrens * You may get multiple opens, but only one close. 639fa9e4066Sahrens */ 640fa9e4066Sahrens zv->zv_open_count[otyp]--; 641fa9e4066Sahrens zv->zv_total_opens--; 642fa9e4066Sahrens 643fa9e4066Sahrens mutex_exit(&zvol_state_lock); 644fa9e4066Sahrens 645fa9e4066Sahrens return (0); 646fa9e4066Sahrens } 647fa9e4066Sahrens 64822ac5be4Sperrin /* 649a24e15ceSperrin * Create and return an immediate write ZIL transaction. 650a24e15ceSperrin */ 651a24e15ceSperrin itx_t * 652a24e15ceSperrin zvol_immediate_itx(offset_t off, ssize_t len, char *addr) 653a24e15ceSperrin { 654a24e15ceSperrin itx_t *itx; 655a24e15ceSperrin lr_write_t *lr; 656a24e15ceSperrin 657a24e15ceSperrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + len); 658a24e15ceSperrin lr = (lr_write_t *)&itx->itx_lr; 659a24e15ceSperrin lr->lr_foid = ZVOL_OBJ; 660a24e15ceSperrin lr->lr_offset = off; 661a24e15ceSperrin lr->lr_length = len; 662a24e15ceSperrin lr->lr_blkoff = 0; 663a24e15ceSperrin BP_ZERO(&lr->lr_blkptr); 664a24e15ceSperrin bcopy(addr, (char *)itx + offsetof(itx_t, itx_lr) + 665a24e15ceSperrin sizeof (*lr), len); 666a24e15ceSperrin itx->itx_wr_state = WR_COPIED; 667a24e15ceSperrin return (itx); 668a24e15ceSperrin } 669a24e15ceSperrin 670a24e15ceSperrin /* 671a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 67222ac5be4Sperrin * 67322ac5be4Sperrin * We store data in the log buffers if it's small enough. 67422ac5be4Sperrin * Otherwise we flush the data out via dmu_sync(). 67522ac5be4Sperrin */ 67622ac5be4Sperrin ssize_t zvol_immediate_write_sz = 65536; 67722ac5be4Sperrin 67822ac5be4Sperrin int 67922ac5be4Sperrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len, 68022ac5be4Sperrin char *addr) 68122ac5be4Sperrin { 682a24e15ceSperrin dmu_object_info_t doi; 683a24e15ceSperrin ssize_t nbytes; 68422ac5be4Sperrin itx_t *itx; 68522ac5be4Sperrin lr_write_t *lr; 686a24e15ceSperrin objset_t *os; 687*c5c6ffa0Smaybee dmu_buf_t *db; 688a24e15ceSperrin uint64_t txg; 689*c5c6ffa0Smaybee uint64_t boff; 69022ac5be4Sperrin int error; 691a24e15ceSperrin uint32_t blocksize; 69222ac5be4Sperrin 693a24e15ceSperrin /* handle common case */ 694a24e15ceSperrin if (len <= zvol_immediate_write_sz) { 695a24e15ceSperrin itx = zvol_immediate_itx(off, len, addr); 696a24e15ceSperrin (void) zil_itx_assign(zv->zv_zilog, itx, tx); 697a24e15ceSperrin return (0); 698a24e15ceSperrin } 699a24e15ceSperrin 700a24e15ceSperrin txg = dmu_tx_get_txg(tx); 701a24e15ceSperrin os = zv->zv_objset; 70222ac5be4Sperrin 70322ac5be4Sperrin /* 704a24e15ceSperrin * We need to dmu_sync() each block in the range. 705a24e15ceSperrin * For this we need the blocksize. 70622ac5be4Sperrin */ 707a24e15ceSperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 708a24e15ceSperrin if (error) 709a24e15ceSperrin return (error); 710a24e15ceSperrin blocksize = doi.doi_data_block_size; 711a24e15ceSperrin 712a24e15ceSperrin /* 713a24e15ceSperrin * We need to immediate write or dmu_sync() each block in the range. 714a24e15ceSperrin */ 715a24e15ceSperrin while (len) { 716a24e15ceSperrin nbytes = MIN(len, blocksize - P2PHASE(off, blocksize)); 717a24e15ceSperrin if (nbytes <= zvol_immediate_write_sz) { 718a24e15ceSperrin itx = zvol_immediate_itx(off, nbytes, addr); 719a24e15ceSperrin } else { 720*c5c6ffa0Smaybee boff = P2ALIGN_TYPED(off, blocksize, uint64_t); 721a24e15ceSperrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 722a24e15ceSperrin lr = (lr_write_t *)&itx->itx_lr; 723a24e15ceSperrin lr->lr_foid = ZVOL_OBJ; 724a24e15ceSperrin lr->lr_offset = off; 725a24e15ceSperrin lr->lr_length = nbytes; 726*c5c6ffa0Smaybee lr->lr_blkoff = off - boff; 727a24e15ceSperrin BP_ZERO(&lr->lr_blkptr); 728a24e15ceSperrin 729*c5c6ffa0Smaybee /* XXX - we should do these IOs in parallel */ 730*c5c6ffa0Smaybee VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, boff, 731*c5c6ffa0Smaybee FTAG, &db)); 732*c5c6ffa0Smaybee ASSERT(boff == db->db_offset); 733*c5c6ffa0Smaybee error = dmu_sync(NULL, db, &lr->lr_blkptr, 734*c5c6ffa0Smaybee txg, NULL, NULL); 735*c5c6ffa0Smaybee dmu_buf_rele(db, FTAG); 736a24e15ceSperrin if (error) { 737a24e15ceSperrin kmem_free(itx, offsetof(itx_t, itx_lr)); 738a24e15ceSperrin return (error); 739a24e15ceSperrin } 740a24e15ceSperrin itx->itx_wr_state = WR_COPIED; 74122ac5be4Sperrin } 742a24e15ceSperrin (void) zil_itx_assign(zv->zv_zilog, itx, tx); 743a24e15ceSperrin len -= nbytes; 744a24e15ceSperrin off += nbytes; 74522ac5be4Sperrin } 74622ac5be4Sperrin return (0); 74722ac5be4Sperrin } 74822ac5be4Sperrin 749fa9e4066Sahrens int 750fa9e4066Sahrens zvol_strategy(buf_t *bp) 751fa9e4066Sahrens { 752fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 753fa9e4066Sahrens uint64_t off, volsize; 754fa9e4066Sahrens size_t size, resid; 755fa9e4066Sahrens char *addr; 75622ac5be4Sperrin objset_t *os; 757fa9e4066Sahrens int error = 0; 75822ac5be4Sperrin int sync; 759a24e15ceSperrin int reading; 760a24e15ceSperrin int txg_sync_needed = B_FALSE; 761fa9e4066Sahrens 762fa9e4066Sahrens if (zv == NULL) { 763fa9e4066Sahrens bioerror(bp, ENXIO); 764fa9e4066Sahrens biodone(bp); 765fa9e4066Sahrens return (0); 766fa9e4066Sahrens } 767fa9e4066Sahrens 768fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 769fa9e4066Sahrens bioerror(bp, EINVAL); 770fa9e4066Sahrens biodone(bp); 771fa9e4066Sahrens return (0); 772fa9e4066Sahrens } 773fa9e4066Sahrens 774fa9e4066Sahrens if (zv->zv_readonly && !(bp->b_flags & B_READ)) { 775fa9e4066Sahrens bioerror(bp, EROFS); 776fa9e4066Sahrens biodone(bp); 777fa9e4066Sahrens return (0); 778fa9e4066Sahrens } 779fa9e4066Sahrens 780fa9e4066Sahrens off = ldbtob(bp->b_blkno); 781fa9e4066Sahrens volsize = zv->zv_volsize; 782fa9e4066Sahrens 78322ac5be4Sperrin os = zv->zv_objset; 78422ac5be4Sperrin ASSERT(os != NULL); 78522ac5be4Sperrin sync = !(bp->b_flags & B_ASYNC) && !(zil_disable); 786fa9e4066Sahrens 787fa9e4066Sahrens bp_mapin(bp); 788fa9e4066Sahrens addr = bp->b_un.b_addr; 789fa9e4066Sahrens resid = bp->b_bcount; 790fa9e4066Sahrens 791a24e15ceSperrin /* 792a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 793a24e15ceSperrin * we can't change the data whilst calculating the checksum. 794a24e15ceSperrin * A better approach than a per zvol rwlock would be to lock ranges. 795a24e15ceSperrin */ 796a24e15ceSperrin reading = bp->b_flags & B_READ; 797a24e15ceSperrin if (reading || resid <= zvol_immediate_write_sz) 798a24e15ceSperrin rw_enter(&zv->zv_dslock, RW_READER); 799a24e15ceSperrin else 800a24e15ceSperrin rw_enter(&zv->zv_dslock, RW_WRITER); 801a24e15ceSperrin 802fa9e4066Sahrens while (resid != 0 && off < volsize) { 803fa9e4066Sahrens 804fa9e4066Sahrens size = MIN(resid, 1UL << 20); /* cap at 1MB per tx */ 805fa9e4066Sahrens 806fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 807fa9e4066Sahrens size = volsize - off; 808fa9e4066Sahrens 809a24e15ceSperrin if (reading) { 810a24e15ceSperrin error = dmu_read(os, ZVOL_OBJ, off, size, addr); 811fa9e4066Sahrens } else { 81222ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 813fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 814fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 815fa9e4066Sahrens if (error) { 816fa9e4066Sahrens dmu_tx_abort(tx); 817fa9e4066Sahrens } else { 81822ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 81922ac5be4Sperrin if (sync) { 82022ac5be4Sperrin /* use the ZIL to commit this write */ 821a24e15ceSperrin if (zvol_log_write(zv, tx, off, size, 822a24e15ceSperrin addr) != 0) { 823a24e15ceSperrin txg_sync_needed = B_TRUE; 82422ac5be4Sperrin } 82522ac5be4Sperrin } 826fa9e4066Sahrens dmu_tx_commit(tx); 827fa9e4066Sahrens } 828fa9e4066Sahrens } 829fa9e4066Sahrens if (error) 830fa9e4066Sahrens break; 831fa9e4066Sahrens off += size; 832fa9e4066Sahrens addr += size; 833fa9e4066Sahrens resid -= size; 834fa9e4066Sahrens } 835a24e15ceSperrin rw_exit(&zv->zv_dslock); 836fa9e4066Sahrens 837fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 838fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 839fa9e4066Sahrens 840fa9e4066Sahrens biodone(bp); 84122ac5be4Sperrin 842a24e15ceSperrin if (sync) { 843a24e15ceSperrin if (txg_sync_needed) 844a24e15ceSperrin txg_wait_synced(dmu_objset_pool(os), 0); 845a24e15ceSperrin else 846a24e15ceSperrin zil_commit(zv->zv_zilog, UINT64_MAX, FDSYNC); 847a24e15ceSperrin } 84822ac5be4Sperrin 849fa9e4066Sahrens return (0); 850fa9e4066Sahrens } 851fa9e4066Sahrens 852fa9e4066Sahrens /*ARGSUSED*/ 853fa9e4066Sahrens int 854fa9e4066Sahrens zvol_read(dev_t dev, uio_t *uiop, cred_t *cr) 855fa9e4066Sahrens { 856fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_READ, minphys, uiop)); 857fa9e4066Sahrens } 858fa9e4066Sahrens 859fa9e4066Sahrens /*ARGSUSED*/ 860fa9e4066Sahrens int 861fa9e4066Sahrens zvol_write(dev_t dev, uio_t *uiop, cred_t *cr) 862fa9e4066Sahrens { 863fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_WRITE, minphys, uiop)); 864fa9e4066Sahrens } 865fa9e4066Sahrens 866fa9e4066Sahrens /*ARGSUSED*/ 867fa9e4066Sahrens int 868fa9e4066Sahrens zvol_aread(dev_t dev, struct aio_req *aio, cred_t *cr) 869fa9e4066Sahrens { 870fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_READ, minphys, aio)); 871fa9e4066Sahrens } 872fa9e4066Sahrens 873fa9e4066Sahrens /*ARGSUSED*/ 874fa9e4066Sahrens int 875fa9e4066Sahrens zvol_awrite(dev_t dev, struct aio_req *aio, cred_t *cr) 876fa9e4066Sahrens { 877fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_WRITE, minphys, aio)); 878fa9e4066Sahrens } 879fa9e4066Sahrens 880fa9e4066Sahrens /* 881fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 882fa9e4066Sahrens */ 883fa9e4066Sahrens /*ARGSUSED*/ 884fa9e4066Sahrens int 885fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 886fa9e4066Sahrens { 887fa9e4066Sahrens zvol_state_t *zv; 888fa9e4066Sahrens struct dk_cinfo dkc; 889fa9e4066Sahrens struct dk_minfo dkm; 890fa9e4066Sahrens dk_efi_t efi; 891fa9e4066Sahrens efi_gpt_t gpt; 892fa9e4066Sahrens efi_gpe_t gpe; 893fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 894fa9e4066Sahrens uint32_t crc; 895fa9e4066Sahrens int error = 0; 896fa9e4066Sahrens 897fa9e4066Sahrens mutex_enter(&zvol_state_lock); 898fa9e4066Sahrens 899fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 900fa9e4066Sahrens 901fa9e4066Sahrens if (zv == NULL) { 902fa9e4066Sahrens mutex_exit(&zvol_state_lock); 903fa9e4066Sahrens return (ENXIO); 904fa9e4066Sahrens } 905fa9e4066Sahrens 906fa9e4066Sahrens switch (cmd) { 907fa9e4066Sahrens 908fa9e4066Sahrens case DKIOCINFO: 909fa9e4066Sahrens bzero(&dkc, sizeof (dkc)); 910fa9e4066Sahrens (void) strcpy(dkc.dki_cname, "zvol"); 911fa9e4066Sahrens (void) strcpy(dkc.dki_dname, "zvol"); 912fa9e4066Sahrens dkc.dki_ctype = DKC_UNKNOWN; 9138f8be083Sbonwick dkc.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 914fa9e4066Sahrens mutex_exit(&zvol_state_lock); 915fa9e4066Sahrens if (ddi_copyout(&dkc, (void *)arg, sizeof (dkc), flag)) 916fa9e4066Sahrens error = EFAULT; 917fa9e4066Sahrens return (error); 918fa9e4066Sahrens 919fa9e4066Sahrens case DKIOCGMEDIAINFO: 920fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 921fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 922fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 923fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 924fa9e4066Sahrens mutex_exit(&zvol_state_lock); 925fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 926fa9e4066Sahrens error = EFAULT; 927fa9e4066Sahrens return (error); 928fa9e4066Sahrens 929fa9e4066Sahrens case DKIOCGETEFI: 930fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 931fa9e4066Sahrens mutex_exit(&zvol_state_lock); 932fa9e4066Sahrens return (EFAULT); 933fa9e4066Sahrens } 934fa9e4066Sahrens 935fa9e4066Sahrens bzero(&gpt, sizeof (gpt)); 936fa9e4066Sahrens bzero(&gpe, sizeof (gpe)); 937fa9e4066Sahrens 938fa9e4066Sahrens efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 939fa9e4066Sahrens 940fa9e4066Sahrens if (efi.dki_length < sizeof (gpt) + sizeof (gpe)) { 941fa9e4066Sahrens mutex_exit(&zvol_state_lock); 942fa9e4066Sahrens return (EINVAL); 943fa9e4066Sahrens } 944fa9e4066Sahrens 945fa9e4066Sahrens efi.dki_length = sizeof (gpt) + sizeof (gpe); 946fa9e4066Sahrens 947fa9e4066Sahrens gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 9485c5460e9Seschrock gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 949fa9e4066Sahrens gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 950fa9e4066Sahrens gpt.efi_gpt_FirstUsableLBA = LE_64(0ULL); 951fa9e4066Sahrens gpt.efi_gpt_LastUsableLBA = 952fa9e4066Sahrens LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 953fa9e4066Sahrens gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 954fa9e4066Sahrens gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 955fa9e4066Sahrens 956fa9e4066Sahrens UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 957fa9e4066Sahrens gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 958fa9e4066Sahrens gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 959fa9e4066Sahrens 960fa9e4066Sahrens CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 961fa9e4066Sahrens gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 962fa9e4066Sahrens 963fa9e4066Sahrens CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 964fa9e4066Sahrens gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 965fa9e4066Sahrens 966fa9e4066Sahrens mutex_exit(&zvol_state_lock); 967fa9e4066Sahrens if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag) || 968fa9e4066Sahrens ddi_copyout(&gpe, efi.dki_data + 1, sizeof (gpe), flag)) 969fa9e4066Sahrens error = EFAULT; 970fa9e4066Sahrens return (error); 971fa9e4066Sahrens 972fa9e4066Sahrens default: 973fa9e4066Sahrens error = ENOTSUP; 974fa9e4066Sahrens break; 975fa9e4066Sahrens 976fa9e4066Sahrens } 977fa9e4066Sahrens mutex_exit(&zvol_state_lock); 978fa9e4066Sahrens return (error); 979fa9e4066Sahrens } 980fa9e4066Sahrens 981fa9e4066Sahrens int 982fa9e4066Sahrens zvol_busy(void) 983fa9e4066Sahrens { 984fa9e4066Sahrens return (zvol_minors != 0); 985fa9e4066Sahrens } 986fa9e4066Sahrens 987fa9e4066Sahrens void 988fa9e4066Sahrens zvol_init(void) 989fa9e4066Sahrens { 990fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 991fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 992fa9e4066Sahrens } 993fa9e4066Sahrens 994fa9e4066Sahrens void 995fa9e4066Sahrens zvol_fini(void) 996fa9e4066Sahrens { 997fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 998fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 999fa9e4066Sahrens } 1000