1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5*ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6*ea8dc4b6Seschrock * 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> 71fa9e4066Sahrens 72fa9e4066Sahrens #include "zfs_namecheck.h" 73fa9e4066Sahrens 74fa9e4066Sahrens #define ZVOL_OBJ 1ULL 75fa9e4066Sahrens #define ZVOL_ZAP_OBJ 2ULL 76fa9e4066Sahrens 77fa9e4066Sahrens static void *zvol_state; 78fa9e4066Sahrens 79fa9e4066Sahrens /* 80fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 81fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 82fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 83fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 84fa9e4066Sahrens */ 85fa9e4066Sahrens static kmutex_t zvol_state_lock; 86fa9e4066Sahrens static uint32_t zvol_minors; 87fa9e4066Sahrens 88fa9e4066Sahrens /* 89fa9e4066Sahrens * The in-core state of each volume. 90fa9e4066Sahrens */ 91fa9e4066Sahrens typedef struct zvol_state { 92fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 93fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 94fa9e4066Sahrens minor_t zv_minor; /* minor number */ 95fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 96fa9e4066Sahrens uint8_t zv_readonly; /* hard readonly; like write-protect */ 97fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 98fa9e4066Sahrens uint32_t zv_mode; /* DS_MODE_* flags at open time */ 99fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 100fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 10122ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 10222ac5be4Sperrin uint64_t zv_txg_assign; /* txg to assign during ZIL replay */ 103fa9e4066Sahrens } zvol_state_t; 104fa9e4066Sahrens 105fa9e4066Sahrens static void 106fa9e4066Sahrens zvol_size_changed(zvol_state_t *zv, dev_t dev) 107fa9e4066Sahrens { 108fa9e4066Sahrens dev = makedevice(getmajor(dev), zv->zv_minor); 109fa9e4066Sahrens 110fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 111fa9e4066Sahrens "Size", zv->zv_volsize) == DDI_SUCCESS); 112fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 113fa9e4066Sahrens "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); 114fa9e4066Sahrens } 115fa9e4066Sahrens 116fa9e4066Sahrens int 1175c5460e9Seschrock zvol_check_volsize(zfs_cmd_t *zc, uint64_t blocksize) 118fa9e4066Sahrens { 119fa9e4066Sahrens if (zc->zc_volsize == 0) 120fa9e4066Sahrens return (EINVAL); 121fa9e4066Sahrens 1225c5460e9Seschrock if (zc->zc_volsize % blocksize != 0) 1235c5460e9Seschrock return (EINVAL); 1245c5460e9Seschrock 125fa9e4066Sahrens #ifdef _ILP32 126fa9e4066Sahrens if (zc->zc_volsize - 1 > SPEC_MAXOFFSET_T) 127fa9e4066Sahrens return (EOVERFLOW); 128fa9e4066Sahrens #endif 129fa9e4066Sahrens return (0); 130fa9e4066Sahrens } 131fa9e4066Sahrens 132fa9e4066Sahrens int 133fa9e4066Sahrens zvol_check_volblocksize(zfs_cmd_t *zc) 134fa9e4066Sahrens { 135fa9e4066Sahrens if (zc->zc_volblocksize < SPA_MINBLOCKSIZE || 136fa9e4066Sahrens zc->zc_volblocksize > SPA_MAXBLOCKSIZE || 137fa9e4066Sahrens !ISP2(zc->zc_volblocksize)) 138fa9e4066Sahrens return (EDOM); 139fa9e4066Sahrens 140fa9e4066Sahrens return (0); 141fa9e4066Sahrens } 142fa9e4066Sahrens 143fa9e4066Sahrens static void 144fa9e4066Sahrens zvol_readonly_changed_cb(void *arg, uint64_t newval) 145fa9e4066Sahrens { 146fa9e4066Sahrens zvol_state_t *zv = arg; 147fa9e4066Sahrens 148fa9e4066Sahrens zv->zv_readonly = (uint8_t)newval; 149fa9e4066Sahrens } 150fa9e4066Sahrens 151fa9e4066Sahrens int 152fa9e4066Sahrens zvol_get_stats(zfs_cmd_t *zc, objset_t *os) 153fa9e4066Sahrens { 154fa9e4066Sahrens int error; 155fa9e4066Sahrens dmu_object_info_t doi; 156fa9e4066Sahrens 157fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize); 158fa9e4066Sahrens 159fa9e4066Sahrens if (error) 160fa9e4066Sahrens return (error); 161fa9e4066Sahrens 162fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 163fa9e4066Sahrens 164fa9e4066Sahrens if (error == 0) 165fa9e4066Sahrens zc->zc_volblocksize = doi.doi_data_block_size; 166fa9e4066Sahrens 167fa9e4066Sahrens return (error); 168fa9e4066Sahrens } 169fa9e4066Sahrens 170fa9e4066Sahrens /* 171fa9e4066Sahrens * Find a free minor number. 172fa9e4066Sahrens */ 173fa9e4066Sahrens static minor_t 174fa9e4066Sahrens zvol_minor_alloc(void) 175fa9e4066Sahrens { 176fa9e4066Sahrens minor_t minor; 177fa9e4066Sahrens 178fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 179fa9e4066Sahrens 180fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 181fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 182fa9e4066Sahrens return (minor); 183fa9e4066Sahrens 184fa9e4066Sahrens return (0); 185fa9e4066Sahrens } 186fa9e4066Sahrens 187fa9e4066Sahrens static zvol_state_t * 188fa9e4066Sahrens zvol_minor_lookup(char *name) 189fa9e4066Sahrens { 190fa9e4066Sahrens minor_t minor; 191fa9e4066Sahrens zvol_state_t *zv; 192fa9e4066Sahrens 193fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 194fa9e4066Sahrens 195fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 196fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 197fa9e4066Sahrens if (zv == NULL) 198fa9e4066Sahrens continue; 199fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 200fa9e4066Sahrens break; 201fa9e4066Sahrens } 202fa9e4066Sahrens 203fa9e4066Sahrens return (zv); 204fa9e4066Sahrens } 205fa9e4066Sahrens 206fa9e4066Sahrens void 207fa9e4066Sahrens zvol_create_cb(objset_t *os, void *arg, dmu_tx_t *tx) 208fa9e4066Sahrens { 209fa9e4066Sahrens zfs_cmd_t *zc = arg; 210fa9e4066Sahrens int error; 211fa9e4066Sahrens 212fa9e4066Sahrens error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, zc->zc_volblocksize, 213fa9e4066Sahrens DMU_OT_NONE, 0, tx); 214fa9e4066Sahrens ASSERT(error == 0); 215fa9e4066Sahrens 216fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 217fa9e4066Sahrens DMU_OT_NONE, 0, tx); 218fa9e4066Sahrens ASSERT(error == 0); 219fa9e4066Sahrens 220fa9e4066Sahrens error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize, tx); 221fa9e4066Sahrens ASSERT(error == 0); 222fa9e4066Sahrens } 223fa9e4066Sahrens 22422ac5be4Sperrin /* 22522ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 22622ac5be4Sperrin * after a system failure 22722ac5be4Sperrin */ 22822ac5be4Sperrin static int 22922ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 23022ac5be4Sperrin { 23122ac5be4Sperrin objset_t *os = zv->zv_objset; 23222ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 23322ac5be4Sperrin uint64_t off = lr->lr_offset; 23422ac5be4Sperrin uint64_t len = lr->lr_length; 23522ac5be4Sperrin dmu_tx_t *tx; 23622ac5be4Sperrin int error; 23722ac5be4Sperrin 23822ac5be4Sperrin if (byteswap) 23922ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 24022ac5be4Sperrin 24122ac5be4Sperrin restart: 24222ac5be4Sperrin tx = dmu_tx_create(os); 24322ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 24422ac5be4Sperrin error = dmu_tx_assign(tx, zv->zv_txg_assign); 24522ac5be4Sperrin if (error) { 24622ac5be4Sperrin dmu_tx_abort(tx); 24722ac5be4Sperrin if (error == ERESTART && zv->zv_txg_assign == TXG_NOWAIT) { 24822ac5be4Sperrin txg_wait_open(dmu_objset_pool(os), 0); 24922ac5be4Sperrin goto restart; 25022ac5be4Sperrin } 25122ac5be4Sperrin } else { 25222ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 25322ac5be4Sperrin dmu_tx_commit(tx); 25422ac5be4Sperrin } 25522ac5be4Sperrin 25622ac5be4Sperrin return (error); 25722ac5be4Sperrin } 25822ac5be4Sperrin 25922ac5be4Sperrin /* ARGSUSED */ 26022ac5be4Sperrin static int 26122ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 26222ac5be4Sperrin { 26322ac5be4Sperrin return (ENOTSUP); 26422ac5be4Sperrin } 26522ac5be4Sperrin 26622ac5be4Sperrin /* 26722ac5be4Sperrin * Callback vectors for replaying records. 26822ac5be4Sperrin * Only TX_WRITE is needed for zvol. 26922ac5be4Sperrin */ 27022ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 27122ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 27222ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 27322ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 27422ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 27522ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 27622ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 27722ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 27822ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 27922ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 28022ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 28122ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 28222ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 28322ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 28422ac5be4Sperrin }; 28522ac5be4Sperrin 286fa9e4066Sahrens /* 287fa9e4066Sahrens * Create a minor node for the specified volume. 288fa9e4066Sahrens */ 289fa9e4066Sahrens int 290fa9e4066Sahrens zvol_create_minor(zfs_cmd_t *zc) 291fa9e4066Sahrens { 292fa9e4066Sahrens char *name = zc->zc_name; 293fa9e4066Sahrens dev_t dev = zc->zc_dev; 294fa9e4066Sahrens zvol_state_t *zv; 295fa9e4066Sahrens objset_t *os; 296fa9e4066Sahrens uint64_t volsize; 297fa9e4066Sahrens minor_t minor = 0; 298fa9e4066Sahrens struct pathname linkpath; 299fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 300fa9e4066Sahrens vnode_t *vp = NULL; 301fa9e4066Sahrens char *devpath; 302fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 303fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 304fa9e4066Sahrens int error; 305fa9e4066Sahrens 306fa9e4066Sahrens mutex_enter(&zvol_state_lock); 307fa9e4066Sahrens 308fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 309fa9e4066Sahrens mutex_exit(&zvol_state_lock); 310fa9e4066Sahrens return (EEXIST); 311fa9e4066Sahrens } 312fa9e4066Sahrens 313fa9e4066Sahrens if (strchr(name, '@') != 0) 314fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 315fa9e4066Sahrens 316fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 317fa9e4066Sahrens 318fa9e4066Sahrens if (error) { 319fa9e4066Sahrens mutex_exit(&zvol_state_lock); 320fa9e4066Sahrens return (error); 321fa9e4066Sahrens } 322fa9e4066Sahrens 323fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 324fa9e4066Sahrens 325fa9e4066Sahrens if (error) { 326fa9e4066Sahrens dmu_objset_close(os); 327fa9e4066Sahrens mutex_exit(&zvol_state_lock); 328fa9e4066Sahrens return (error); 329fa9e4066Sahrens } 330fa9e4066Sahrens 331fa9e4066Sahrens /* 332fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 333fa9e4066Sahrens * same minor number we used last time. 334fa9e4066Sahrens */ 335fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 336fa9e4066Sahrens 337fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 338fa9e4066Sahrens 339fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 340fa9e4066Sahrens 341fa9e4066Sahrens kmem_free(devpath, devpathlen); 342fa9e4066Sahrens 343fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 344fa9e4066Sahrens error = EINVAL; 345fa9e4066Sahrens 346fa9e4066Sahrens if (error == 0) { 347fa9e4066Sahrens pn_alloc(&linkpath); 348fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 349fa9e4066Sahrens if (error == 0) { 350fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 351fa9e4066Sahrens if (ms != NULL) { 352fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 353fa9e4066Sahrens minor = stoi(&ms); 354fa9e4066Sahrens } 355fa9e4066Sahrens } 356fa9e4066Sahrens pn_free(&linkpath); 357fa9e4066Sahrens } 358fa9e4066Sahrens 359fa9e4066Sahrens if (vp != NULL) 360fa9e4066Sahrens VN_RELE(vp); 361fa9e4066Sahrens 362fa9e4066Sahrens /* 363fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 364fa9e4066Sahrens */ 365fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 366fa9e4066Sahrens minor = 0; 367fa9e4066Sahrens 368fa9e4066Sahrens if (minor == 0) 369fa9e4066Sahrens minor = zvol_minor_alloc(); 370fa9e4066Sahrens 371fa9e4066Sahrens if (minor == 0) { 372fa9e4066Sahrens dmu_objset_close(os); 373fa9e4066Sahrens mutex_exit(&zvol_state_lock); 374fa9e4066Sahrens return (ENXIO); 375fa9e4066Sahrens } 376fa9e4066Sahrens 377fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 378fa9e4066Sahrens dmu_objset_close(os); 379fa9e4066Sahrens mutex_exit(&zvol_state_lock); 380fa9e4066Sahrens return (EAGAIN); 381fa9e4066Sahrens } 382fa9e4066Sahrens 383fa9e4066Sahrens (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, name); 384fa9e4066Sahrens 385fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 386fa9e4066Sahrens 387fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 388fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 389fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 390fa9e4066Sahrens dmu_objset_close(os); 391fa9e4066Sahrens mutex_exit(&zvol_state_lock); 392fa9e4066Sahrens return (EAGAIN); 393fa9e4066Sahrens } 394fa9e4066Sahrens 395fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 396fa9e4066Sahrens 397fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 398fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 399fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 400fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 401fa9e4066Sahrens dmu_objset_close(os); 402fa9e4066Sahrens mutex_exit(&zvol_state_lock); 403fa9e4066Sahrens return (EAGAIN); 404fa9e4066Sahrens } 405fa9e4066Sahrens 406fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 407fa9e4066Sahrens 408fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 409fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 410fa9e4066Sahrens zv->zv_minor = minor; 411fa9e4066Sahrens zv->zv_volsize = volsize; 412fa9e4066Sahrens zv->zv_objset = os; 413fa9e4066Sahrens zv->zv_mode = ds_mode; 41422ac5be4Sperrin zv->zv_zilog = zil_open(os, NULL); 41522ac5be4Sperrin 41622ac5be4Sperrin zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector, NULL); 417fa9e4066Sahrens 418fa9e4066Sahrens zvol_size_changed(zv, dev); 419fa9e4066Sahrens 420*ea8dc4b6Seschrock /* XXX this should handle the possible i/o error */ 421fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 422fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 423fa9e4066Sahrens 424fa9e4066Sahrens zvol_minors++; 425fa9e4066Sahrens 426fa9e4066Sahrens mutex_exit(&zvol_state_lock); 427fa9e4066Sahrens 428fa9e4066Sahrens return (0); 429fa9e4066Sahrens } 430fa9e4066Sahrens 431fa9e4066Sahrens /* 432fa9e4066Sahrens * Remove minor node for the specified volume. 433fa9e4066Sahrens */ 434fa9e4066Sahrens int 435fa9e4066Sahrens zvol_remove_minor(zfs_cmd_t *zc) 436fa9e4066Sahrens { 437fa9e4066Sahrens zvol_state_t *zv; 438fa9e4066Sahrens char namebuf[30]; 439fa9e4066Sahrens 440fa9e4066Sahrens mutex_enter(&zvol_state_lock); 441fa9e4066Sahrens 442fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 443fa9e4066Sahrens mutex_exit(&zvol_state_lock); 444fa9e4066Sahrens return (ENXIO); 445fa9e4066Sahrens } 446fa9e4066Sahrens 447fa9e4066Sahrens if (zv->zv_total_opens != 0) { 448fa9e4066Sahrens mutex_exit(&zvol_state_lock); 449fa9e4066Sahrens return (EBUSY); 450fa9e4066Sahrens } 451fa9e4066Sahrens 452fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 453fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 454fa9e4066Sahrens 455fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 456fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 457fa9e4066Sahrens 458fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 459fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 460fa9e4066Sahrens 46122ac5be4Sperrin zil_close(zv->zv_zilog); 46222ac5be4Sperrin zv->zv_zilog = NULL; 463fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 464fa9e4066Sahrens zv->zv_objset = NULL; 465fa9e4066Sahrens 466fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 467fa9e4066Sahrens 468fa9e4066Sahrens zvol_minors--; 469fa9e4066Sahrens 470fa9e4066Sahrens mutex_exit(&zvol_state_lock); 471fa9e4066Sahrens 472fa9e4066Sahrens return (0); 473fa9e4066Sahrens } 474fa9e4066Sahrens 475fa9e4066Sahrens int 476fa9e4066Sahrens zvol_set_volsize(zfs_cmd_t *zc) 477fa9e4066Sahrens { 478fa9e4066Sahrens zvol_state_t *zv; 479fa9e4066Sahrens dev_t dev = zc->zc_dev; 480fa9e4066Sahrens dmu_tx_t *tx; 481fa9e4066Sahrens int error; 4825c5460e9Seschrock dmu_object_info_t doi; 483fa9e4066Sahrens 484fa9e4066Sahrens mutex_enter(&zvol_state_lock); 485fa9e4066Sahrens 486fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 487fa9e4066Sahrens mutex_exit(&zvol_state_lock); 488fa9e4066Sahrens return (ENXIO); 489fa9e4066Sahrens } 490fa9e4066Sahrens 4915c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 4925c5460e9Seschrock (error = zvol_check_volsize(zc, doi.doi_data_block_size)) != 0) { 4935c5460e9Seschrock mutex_exit(&zvol_state_lock); 4945c5460e9Seschrock return (error); 4955c5460e9Seschrock } 4965c5460e9Seschrock 497fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 498fa9e4066Sahrens mutex_exit(&zvol_state_lock); 499fa9e4066Sahrens return (EROFS); 500fa9e4066Sahrens } 501fa9e4066Sahrens 502fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 503*ea8dc4b6Seschrock dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 504fa9e4066Sahrens dmu_tx_hold_free(tx, ZVOL_OBJ, zc->zc_volsize, DMU_OBJECT_END); 505fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 506fa9e4066Sahrens if (error) { 507fa9e4066Sahrens dmu_tx_abort(tx); 508fa9e4066Sahrens mutex_exit(&zvol_state_lock); 509fa9e4066Sahrens return (error); 510fa9e4066Sahrens } 511fa9e4066Sahrens 512fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 513fa9e4066Sahrens &zc->zc_volsize, tx); 514*ea8dc4b6Seschrock if (error == 0) { 515*ea8dc4b6Seschrock error = dmu_free_range(zv->zv_objset, ZVOL_OBJ, zc->zc_volsize, 516fa9e4066Sahrens DMU_OBJECT_END, tx); 517*ea8dc4b6Seschrock } 518fa9e4066Sahrens 519fa9e4066Sahrens dmu_tx_commit(tx); 520fa9e4066Sahrens 521fa9e4066Sahrens if (error == 0) { 522fa9e4066Sahrens zv->zv_volsize = zc->zc_volsize; 523fa9e4066Sahrens zvol_size_changed(zv, dev); 524fa9e4066Sahrens } 525fa9e4066Sahrens 526fa9e4066Sahrens mutex_exit(&zvol_state_lock); 527fa9e4066Sahrens 528fa9e4066Sahrens return (error); 529fa9e4066Sahrens } 530fa9e4066Sahrens 531fa9e4066Sahrens int 532fa9e4066Sahrens zvol_set_volblocksize(zfs_cmd_t *zc) 533fa9e4066Sahrens { 534fa9e4066Sahrens zvol_state_t *zv; 535fa9e4066Sahrens dmu_tx_t *tx; 536fa9e4066Sahrens int error; 537fa9e4066Sahrens 538fa9e4066Sahrens mutex_enter(&zvol_state_lock); 539fa9e4066Sahrens 540fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 541fa9e4066Sahrens mutex_exit(&zvol_state_lock); 542fa9e4066Sahrens return (ENXIO); 543fa9e4066Sahrens } 544fa9e4066Sahrens 545fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 546fa9e4066Sahrens mutex_exit(&zvol_state_lock); 547fa9e4066Sahrens return (EROFS); 548fa9e4066Sahrens } 549fa9e4066Sahrens 550fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 551fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 552fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 553fa9e4066Sahrens if (error) { 554fa9e4066Sahrens dmu_tx_abort(tx); 555fa9e4066Sahrens } else { 556fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 557fa9e4066Sahrens zc->zc_volblocksize, 0, tx); 558fa9e4066Sahrens if (error == ENOTSUP) 559fa9e4066Sahrens error = EBUSY; 560fa9e4066Sahrens dmu_tx_commit(tx); 561fa9e4066Sahrens } 562fa9e4066Sahrens 563fa9e4066Sahrens mutex_exit(&zvol_state_lock); 564fa9e4066Sahrens 565fa9e4066Sahrens return (error); 566fa9e4066Sahrens } 567fa9e4066Sahrens 568fa9e4066Sahrens /*ARGSUSED*/ 569fa9e4066Sahrens int 570fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 571fa9e4066Sahrens { 572fa9e4066Sahrens minor_t minor = getminor(*devp); 573fa9e4066Sahrens zvol_state_t *zv; 574fa9e4066Sahrens 575fa9e4066Sahrens if (minor == 0) /* This is the control device */ 576fa9e4066Sahrens return (0); 577fa9e4066Sahrens 578fa9e4066Sahrens mutex_enter(&zvol_state_lock); 579fa9e4066Sahrens 580fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 581fa9e4066Sahrens if (zv == NULL) { 582fa9e4066Sahrens mutex_exit(&zvol_state_lock); 583fa9e4066Sahrens return (ENXIO); 584fa9e4066Sahrens } 585fa9e4066Sahrens 586fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 587fa9e4066Sahrens 588fa9e4066Sahrens if ((flag & FWRITE) && 589fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 590fa9e4066Sahrens mutex_exit(&zvol_state_lock); 591fa9e4066Sahrens return (EROFS); 592fa9e4066Sahrens } 593fa9e4066Sahrens 594fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 595fa9e4066Sahrens zv->zv_open_count[otyp]++; 596fa9e4066Sahrens zv->zv_total_opens++; 597fa9e4066Sahrens } 598fa9e4066Sahrens 599fa9e4066Sahrens mutex_exit(&zvol_state_lock); 600fa9e4066Sahrens 601fa9e4066Sahrens return (0); 602fa9e4066Sahrens } 603fa9e4066Sahrens 604fa9e4066Sahrens /*ARGSUSED*/ 605fa9e4066Sahrens int 606fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 607fa9e4066Sahrens { 608fa9e4066Sahrens minor_t minor = getminor(dev); 609fa9e4066Sahrens zvol_state_t *zv; 610fa9e4066Sahrens 611fa9e4066Sahrens if (minor == 0) /* This is the control device */ 612fa9e4066Sahrens return (0); 613fa9e4066Sahrens 614fa9e4066Sahrens mutex_enter(&zvol_state_lock); 615fa9e4066Sahrens 616fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 617fa9e4066Sahrens if (zv == NULL) { 618fa9e4066Sahrens mutex_exit(&zvol_state_lock); 619fa9e4066Sahrens return (ENXIO); 620fa9e4066Sahrens } 621fa9e4066Sahrens 622fa9e4066Sahrens /* 623fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 624fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 625fa9e4066Sahrens */ 626fa9e4066Sahrens if (zv->zv_total_opens == 0) { 627fa9e4066Sahrens mutex_exit(&zvol_state_lock); 628fa9e4066Sahrens return (0); 629fa9e4066Sahrens } 630fa9e4066Sahrens 631fa9e4066Sahrens /* 632fa9e4066Sahrens * If the open count is zero, this is a spurious close. 633fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 634fa9e4066Sahrens */ 635fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 636fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 637fa9e4066Sahrens 638fa9e4066Sahrens /* 639fa9e4066Sahrens * You may get multiple opens, but only one close. 640fa9e4066Sahrens */ 641fa9e4066Sahrens zv->zv_open_count[otyp]--; 642fa9e4066Sahrens zv->zv_total_opens--; 643fa9e4066Sahrens 644fa9e4066Sahrens mutex_exit(&zvol_state_lock); 645fa9e4066Sahrens 646fa9e4066Sahrens return (0); 647fa9e4066Sahrens } 648fa9e4066Sahrens 64922ac5be4Sperrin /* 65022ac5be4Sperrin * zvol_log_write() handles synchronous page writes using 65122ac5be4Sperrin * TX_WRITE ZIL transactions. 65222ac5be4Sperrin * 65322ac5be4Sperrin * We store data in the log buffers if it's small enough. 65422ac5be4Sperrin * Otherwise we flush the data out via dmu_sync(). 65522ac5be4Sperrin */ 65622ac5be4Sperrin ssize_t zvol_immediate_write_sz = 65536; 65722ac5be4Sperrin 65822ac5be4Sperrin int 65922ac5be4Sperrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len, 66022ac5be4Sperrin char *addr) 66122ac5be4Sperrin { 66222ac5be4Sperrin itx_t *itx; 66322ac5be4Sperrin lr_write_t *lr; 66422ac5be4Sperrin objset_t *os = zv->zv_objset; 66522ac5be4Sperrin int dlen; 66622ac5be4Sperrin int error; 66722ac5be4Sperrin 66822ac5be4Sperrin dlen = (len <= zvol_immediate_write_sz ? len : 0); 66922ac5be4Sperrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + dlen); 67022ac5be4Sperrin lr = (lr_write_t *)&itx->itx_lr; 67122ac5be4Sperrin lr->lr_foid = ZVOL_OBJ; 67222ac5be4Sperrin lr->lr_offset = off; 67322ac5be4Sperrin lr->lr_length = len; 67422ac5be4Sperrin lr->lr_blkoff = 0; 67522ac5be4Sperrin BP_ZERO(&lr->lr_blkptr); 67622ac5be4Sperrin 67722ac5be4Sperrin /* 67822ac5be4Sperrin * Get the data as we know we'll be writing it immediately 67922ac5be4Sperrin */ 68022ac5be4Sperrin if (dlen) { /* immediate write */ 68122ac5be4Sperrin bcopy(addr, (char *)itx + offsetof(itx_t, itx_lr) + 68222ac5be4Sperrin sizeof (*lr), len); 68322ac5be4Sperrin } else { 68422ac5be4Sperrin txg_suspend(dmu_objset_pool(os)); 68522ac5be4Sperrin error = dmu_sync(os, ZVOL_OBJ, off, &lr->lr_blkoff, 68622ac5be4Sperrin &lr->lr_blkptr, dmu_tx_get_txg(tx)); 68722ac5be4Sperrin txg_resume(dmu_objset_pool(os)); 68822ac5be4Sperrin if (error) { 68922ac5be4Sperrin kmem_free(itx, offsetof(itx_t, itx_lr)); 69022ac5be4Sperrin return (error); 69122ac5be4Sperrin } 69222ac5be4Sperrin } 69322ac5be4Sperrin itx->itx_data_copied = 1; 69422ac5be4Sperrin 69522ac5be4Sperrin (void) zil_itx_assign(zv->zv_zilog, itx, tx); 69622ac5be4Sperrin 69722ac5be4Sperrin return (0); 69822ac5be4Sperrin } 69922ac5be4Sperrin 700fa9e4066Sahrens int 701fa9e4066Sahrens zvol_strategy(buf_t *bp) 702fa9e4066Sahrens { 703fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 704fa9e4066Sahrens uint64_t off, volsize; 705fa9e4066Sahrens size_t size, resid; 706fa9e4066Sahrens char *addr; 70722ac5be4Sperrin objset_t *os; 708fa9e4066Sahrens int error = 0; 70922ac5be4Sperrin int sync; 710fa9e4066Sahrens 711fa9e4066Sahrens if (zv == NULL) { 712fa9e4066Sahrens bioerror(bp, ENXIO); 713fa9e4066Sahrens biodone(bp); 714fa9e4066Sahrens return (0); 715fa9e4066Sahrens } 716fa9e4066Sahrens 717fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 718fa9e4066Sahrens bioerror(bp, EINVAL); 719fa9e4066Sahrens biodone(bp); 720fa9e4066Sahrens return (0); 721fa9e4066Sahrens } 722fa9e4066Sahrens 723fa9e4066Sahrens if (zv->zv_readonly && !(bp->b_flags & B_READ)) { 724fa9e4066Sahrens bioerror(bp, EROFS); 725fa9e4066Sahrens biodone(bp); 726fa9e4066Sahrens return (0); 727fa9e4066Sahrens } 728fa9e4066Sahrens 729fa9e4066Sahrens off = ldbtob(bp->b_blkno); 730fa9e4066Sahrens volsize = zv->zv_volsize; 731fa9e4066Sahrens 73222ac5be4Sperrin os = zv->zv_objset; 73322ac5be4Sperrin ASSERT(os != NULL); 73422ac5be4Sperrin sync = !(bp->b_flags & B_ASYNC) && !(zil_disable); 735fa9e4066Sahrens 736fa9e4066Sahrens bp_mapin(bp); 737fa9e4066Sahrens addr = bp->b_un.b_addr; 738fa9e4066Sahrens resid = bp->b_bcount; 739fa9e4066Sahrens 740fa9e4066Sahrens while (resid != 0 && off < volsize) { 741fa9e4066Sahrens 742fa9e4066Sahrens size = MIN(resid, 1UL << 20); /* cap at 1MB per tx */ 743fa9e4066Sahrens 744fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 745fa9e4066Sahrens size = volsize - off; 746fa9e4066Sahrens 747fa9e4066Sahrens if (bp->b_flags & B_READ) { 748*ea8dc4b6Seschrock error = dmu_read(os, ZVOL_OBJ, 749fa9e4066Sahrens off, size, addr); 750fa9e4066Sahrens } else { 75122ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 752fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 753fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 754fa9e4066Sahrens if (error) { 755fa9e4066Sahrens dmu_tx_abort(tx); 756fa9e4066Sahrens } else { 75722ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 75822ac5be4Sperrin if (sync) { 75922ac5be4Sperrin /* use the ZIL to commit this write */ 76022ac5be4Sperrin error = zvol_log_write(zv, tx, off, 76122ac5be4Sperrin size, addr); 76222ac5be4Sperrin if (error) { 76322ac5be4Sperrin txg_wait_synced( 76422ac5be4Sperrin dmu_objset_pool(os), 0); 76522ac5be4Sperrin sync = B_FALSE; 76622ac5be4Sperrin } 76722ac5be4Sperrin } 768fa9e4066Sahrens dmu_tx_commit(tx); 769fa9e4066Sahrens } 770fa9e4066Sahrens } 771fa9e4066Sahrens if (error) 772fa9e4066Sahrens break; 773fa9e4066Sahrens off += size; 774fa9e4066Sahrens addr += size; 775fa9e4066Sahrens resid -= size; 776fa9e4066Sahrens } 777fa9e4066Sahrens 778fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 779fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 780fa9e4066Sahrens 781fa9e4066Sahrens biodone(bp); 78222ac5be4Sperrin 78322ac5be4Sperrin if (sync) 78422ac5be4Sperrin zil_commit(zv->zv_zilog, UINT64_MAX, FDSYNC); 78522ac5be4Sperrin 786fa9e4066Sahrens return (0); 787fa9e4066Sahrens } 788fa9e4066Sahrens 789fa9e4066Sahrens /*ARGSUSED*/ 790fa9e4066Sahrens int 791fa9e4066Sahrens zvol_read(dev_t dev, uio_t *uiop, cred_t *cr) 792fa9e4066Sahrens { 793fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_READ, minphys, uiop)); 794fa9e4066Sahrens } 795fa9e4066Sahrens 796fa9e4066Sahrens /*ARGSUSED*/ 797fa9e4066Sahrens int 798fa9e4066Sahrens zvol_write(dev_t dev, uio_t *uiop, cred_t *cr) 799fa9e4066Sahrens { 800fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_WRITE, minphys, uiop)); 801fa9e4066Sahrens } 802fa9e4066Sahrens 803fa9e4066Sahrens /*ARGSUSED*/ 804fa9e4066Sahrens int 805fa9e4066Sahrens zvol_aread(dev_t dev, struct aio_req *aio, cred_t *cr) 806fa9e4066Sahrens { 807fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_READ, minphys, aio)); 808fa9e4066Sahrens } 809fa9e4066Sahrens 810fa9e4066Sahrens /*ARGSUSED*/ 811fa9e4066Sahrens int 812fa9e4066Sahrens zvol_awrite(dev_t dev, struct aio_req *aio, cred_t *cr) 813fa9e4066Sahrens { 814fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_WRITE, minphys, aio)); 815fa9e4066Sahrens } 816fa9e4066Sahrens 817fa9e4066Sahrens /* 818fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 819fa9e4066Sahrens */ 820fa9e4066Sahrens /*ARGSUSED*/ 821fa9e4066Sahrens int 822fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 823fa9e4066Sahrens { 824fa9e4066Sahrens zvol_state_t *zv; 825fa9e4066Sahrens struct dk_cinfo dkc; 826fa9e4066Sahrens struct dk_minfo dkm; 827fa9e4066Sahrens dk_efi_t efi; 828fa9e4066Sahrens efi_gpt_t gpt; 829fa9e4066Sahrens efi_gpe_t gpe; 830fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 831fa9e4066Sahrens uint32_t crc; 832fa9e4066Sahrens int error = 0; 833fa9e4066Sahrens 834fa9e4066Sahrens mutex_enter(&zvol_state_lock); 835fa9e4066Sahrens 836fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 837fa9e4066Sahrens 838fa9e4066Sahrens if (zv == NULL) { 839fa9e4066Sahrens mutex_exit(&zvol_state_lock); 840fa9e4066Sahrens return (ENXIO); 841fa9e4066Sahrens } 842fa9e4066Sahrens 843fa9e4066Sahrens switch (cmd) { 844fa9e4066Sahrens 845fa9e4066Sahrens case DKIOCINFO: 846fa9e4066Sahrens bzero(&dkc, sizeof (dkc)); 847fa9e4066Sahrens (void) strcpy(dkc.dki_cname, "zvol"); 848fa9e4066Sahrens (void) strcpy(dkc.dki_dname, "zvol"); 849fa9e4066Sahrens dkc.dki_ctype = DKC_UNKNOWN; 8508f8be083Sbonwick dkc.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 851fa9e4066Sahrens mutex_exit(&zvol_state_lock); 852fa9e4066Sahrens if (ddi_copyout(&dkc, (void *)arg, sizeof (dkc), flag)) 853fa9e4066Sahrens error = EFAULT; 854fa9e4066Sahrens return (error); 855fa9e4066Sahrens 856fa9e4066Sahrens case DKIOCGMEDIAINFO: 857fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 858fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 859fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 860fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 861fa9e4066Sahrens mutex_exit(&zvol_state_lock); 862fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 863fa9e4066Sahrens error = EFAULT; 864fa9e4066Sahrens return (error); 865fa9e4066Sahrens 866fa9e4066Sahrens case DKIOCGETEFI: 867fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 868fa9e4066Sahrens mutex_exit(&zvol_state_lock); 869fa9e4066Sahrens return (EFAULT); 870fa9e4066Sahrens } 871fa9e4066Sahrens 872fa9e4066Sahrens bzero(&gpt, sizeof (gpt)); 873fa9e4066Sahrens bzero(&gpe, sizeof (gpe)); 874fa9e4066Sahrens 875fa9e4066Sahrens efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 876fa9e4066Sahrens 877fa9e4066Sahrens if (efi.dki_length < sizeof (gpt) + sizeof (gpe)) { 878fa9e4066Sahrens mutex_exit(&zvol_state_lock); 879fa9e4066Sahrens return (EINVAL); 880fa9e4066Sahrens } 881fa9e4066Sahrens 882fa9e4066Sahrens efi.dki_length = sizeof (gpt) + sizeof (gpe); 883fa9e4066Sahrens 884fa9e4066Sahrens gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 8855c5460e9Seschrock gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 886fa9e4066Sahrens gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 887fa9e4066Sahrens gpt.efi_gpt_FirstUsableLBA = LE_64(0ULL); 888fa9e4066Sahrens gpt.efi_gpt_LastUsableLBA = 889fa9e4066Sahrens LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 890fa9e4066Sahrens gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 891fa9e4066Sahrens gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 892fa9e4066Sahrens 893fa9e4066Sahrens UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 894fa9e4066Sahrens gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 895fa9e4066Sahrens gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 896fa9e4066Sahrens 897fa9e4066Sahrens CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 898fa9e4066Sahrens gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 899fa9e4066Sahrens 900fa9e4066Sahrens CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 901fa9e4066Sahrens gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 902fa9e4066Sahrens 903fa9e4066Sahrens mutex_exit(&zvol_state_lock); 904fa9e4066Sahrens if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag) || 905fa9e4066Sahrens ddi_copyout(&gpe, efi.dki_data + 1, sizeof (gpe), flag)) 906fa9e4066Sahrens error = EFAULT; 907fa9e4066Sahrens return (error); 908fa9e4066Sahrens 909fa9e4066Sahrens default: 910fa9e4066Sahrens error = ENOTSUP; 911fa9e4066Sahrens break; 912fa9e4066Sahrens 913fa9e4066Sahrens } 914fa9e4066Sahrens mutex_exit(&zvol_state_lock); 915fa9e4066Sahrens return (error); 916fa9e4066Sahrens } 917fa9e4066Sahrens 918fa9e4066Sahrens int 919fa9e4066Sahrens zvol_busy(void) 920fa9e4066Sahrens { 921fa9e4066Sahrens return (zvol_minors != 0); 922fa9e4066Sahrens } 923fa9e4066Sahrens 924fa9e4066Sahrens void 925fa9e4066Sahrens zvol_init(void) 926fa9e4066Sahrens { 927fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 928fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 929fa9e4066Sahrens } 930fa9e4066Sahrens 931fa9e4066Sahrens void 932fa9e4066Sahrens zvol_fini(void) 933fa9e4066Sahrens { 934fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 935fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 936fa9e4066Sahrens } 937