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 */ 95*67bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 96fa9e4066Sahrens minor_t zv_minor; /* minor number */ 97fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 98fa9e4066Sahrens uint8_t zv_readonly; /* hard readonly; like write-protect */ 99fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 100fa9e4066Sahrens uint32_t zv_mode; /* DS_MODE_* flags at open time */ 101fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 102fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 10322ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 10422ac5be4Sperrin uint64_t zv_txg_assign; /* txg to assign during ZIL replay */ 105a24e15ceSperrin krwlock_t zv_dslock; /* dmu_sync() rwlock */ 106fa9e4066Sahrens } zvol_state_t; 107fa9e4066Sahrens 108*67bd71c6Sperrin /* 109*67bd71c6Sperrin * zvol maximum transfer in one DMU tx. 110*67bd71c6Sperrin */ 111*67bd71c6Sperrin int zvol_maxphys = DMU_MAX_ACCESS/2; 112*67bd71c6Sperrin 113*67bd71c6Sperrin int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 114*67bd71c6Sperrin 115fa9e4066Sahrens static void 116fa9e4066Sahrens zvol_size_changed(zvol_state_t *zv, dev_t dev) 117fa9e4066Sahrens { 118fa9e4066Sahrens dev = makedevice(getmajor(dev), zv->zv_minor); 119fa9e4066Sahrens 120fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 121fa9e4066Sahrens "Size", zv->zv_volsize) == DDI_SUCCESS); 122fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 123fa9e4066Sahrens "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); 124fa9e4066Sahrens } 125fa9e4066Sahrens 126fa9e4066Sahrens int 127e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 128fa9e4066Sahrens { 129e9dbad6fSeschrock if (volsize == 0) 130fa9e4066Sahrens return (EINVAL); 131fa9e4066Sahrens 132e9dbad6fSeschrock if (volsize % blocksize != 0) 1335c5460e9Seschrock return (EINVAL); 1345c5460e9Seschrock 135fa9e4066Sahrens #ifdef _ILP32 136e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 137fa9e4066Sahrens return (EOVERFLOW); 138fa9e4066Sahrens #endif 139fa9e4066Sahrens return (0); 140fa9e4066Sahrens } 141fa9e4066Sahrens 142fa9e4066Sahrens int 143e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 144fa9e4066Sahrens { 145e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 146e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 147e9dbad6fSeschrock !ISP2(volblocksize)) 148fa9e4066Sahrens return (EDOM); 149fa9e4066Sahrens 150fa9e4066Sahrens return (0); 151fa9e4066Sahrens } 152fa9e4066Sahrens 153fa9e4066Sahrens static void 154fa9e4066Sahrens zvol_readonly_changed_cb(void *arg, uint64_t newval) 155fa9e4066Sahrens { 156fa9e4066Sahrens zvol_state_t *zv = arg; 157fa9e4066Sahrens 158fa9e4066Sahrens zv->zv_readonly = (uint8_t)newval; 159fa9e4066Sahrens } 160fa9e4066Sahrens 161fa9e4066Sahrens int 162a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 163fa9e4066Sahrens { 164fa9e4066Sahrens int error; 165fa9e4066Sahrens dmu_object_info_t doi; 166a2eea2e1Sahrens uint64_t val; 167fa9e4066Sahrens 168fa9e4066Sahrens 169a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 170fa9e4066Sahrens if (error) 171fa9e4066Sahrens return (error); 172fa9e4066Sahrens 173a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 174a2eea2e1Sahrens 175fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 176fa9e4066Sahrens 177a2eea2e1Sahrens if (error == 0) { 178a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 179a2eea2e1Sahrens doi.doi_data_block_size); 180a2eea2e1Sahrens } 181fa9e4066Sahrens 182fa9e4066Sahrens return (error); 183fa9e4066Sahrens } 184fa9e4066Sahrens 185fa9e4066Sahrens /* 186fa9e4066Sahrens * Find a free minor number. 187fa9e4066Sahrens */ 188fa9e4066Sahrens static minor_t 189fa9e4066Sahrens zvol_minor_alloc(void) 190fa9e4066Sahrens { 191fa9e4066Sahrens minor_t minor; 192fa9e4066Sahrens 193fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 194fa9e4066Sahrens 195fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 196fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 197fa9e4066Sahrens return (minor); 198fa9e4066Sahrens 199fa9e4066Sahrens return (0); 200fa9e4066Sahrens } 201fa9e4066Sahrens 202fa9e4066Sahrens static zvol_state_t * 203e9dbad6fSeschrock zvol_minor_lookup(const char *name) 204fa9e4066Sahrens { 205fa9e4066Sahrens minor_t minor; 206fa9e4066Sahrens zvol_state_t *zv; 207fa9e4066Sahrens 208fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 209fa9e4066Sahrens 210fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 211fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 212fa9e4066Sahrens if (zv == NULL) 213fa9e4066Sahrens continue; 214fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 215fa9e4066Sahrens break; 216fa9e4066Sahrens } 217fa9e4066Sahrens 218fa9e4066Sahrens return (zv); 219fa9e4066Sahrens } 220fa9e4066Sahrens 221fa9e4066Sahrens void 222fa9e4066Sahrens zvol_create_cb(objset_t *os, void *arg, dmu_tx_t *tx) 223fa9e4066Sahrens { 224e9dbad6fSeschrock zfs_create_data_t *zc = arg; 225fa9e4066Sahrens int error; 226e9dbad6fSeschrock uint64_t volblocksize, volsize; 227fa9e4066Sahrens 228e9dbad6fSeschrock VERIFY(nvlist_lookup_uint64(zc->zc_props, 229e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 230e9dbad6fSeschrock if (nvlist_lookup_uint64(zc->zc_props, 231e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 232e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 233e9dbad6fSeschrock 234e9dbad6fSeschrock /* 235e9dbad6fSeschrock * These properites must be removed from the list so the generic 236e9dbad6fSeschrock * property setting step won't apply to them. 237e9dbad6fSeschrock */ 238e9dbad6fSeschrock VERIFY(nvlist_remove_all(zc->zc_props, 239e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 240e9dbad6fSeschrock (void) nvlist_remove_all(zc->zc_props, 241e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 242e9dbad6fSeschrock 243e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 244fa9e4066Sahrens DMU_OT_NONE, 0, tx); 245fa9e4066Sahrens ASSERT(error == 0); 246fa9e4066Sahrens 247fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 248fa9e4066Sahrens DMU_OT_NONE, 0, tx); 249fa9e4066Sahrens ASSERT(error == 0); 250fa9e4066Sahrens 251e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 252fa9e4066Sahrens ASSERT(error == 0); 253fa9e4066Sahrens } 254fa9e4066Sahrens 25522ac5be4Sperrin /* 25622ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 25722ac5be4Sperrin * after a system failure 25822ac5be4Sperrin */ 25922ac5be4Sperrin static int 26022ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 26122ac5be4Sperrin { 26222ac5be4Sperrin objset_t *os = zv->zv_objset; 26322ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 26422ac5be4Sperrin uint64_t off = lr->lr_offset; 26522ac5be4Sperrin uint64_t len = lr->lr_length; 26622ac5be4Sperrin dmu_tx_t *tx; 26722ac5be4Sperrin int error; 26822ac5be4Sperrin 26922ac5be4Sperrin if (byteswap) 27022ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 27122ac5be4Sperrin 27222ac5be4Sperrin tx = dmu_tx_create(os); 27322ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 27422ac5be4Sperrin error = dmu_tx_assign(tx, zv->zv_txg_assign); 27522ac5be4Sperrin if (error) { 27622ac5be4Sperrin dmu_tx_abort(tx); 27722ac5be4Sperrin } else { 27822ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 27922ac5be4Sperrin dmu_tx_commit(tx); 28022ac5be4Sperrin } 28122ac5be4Sperrin 28222ac5be4Sperrin return (error); 28322ac5be4Sperrin } 28422ac5be4Sperrin 28522ac5be4Sperrin /* ARGSUSED */ 28622ac5be4Sperrin static int 28722ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 28822ac5be4Sperrin { 28922ac5be4Sperrin return (ENOTSUP); 29022ac5be4Sperrin } 29122ac5be4Sperrin 29222ac5be4Sperrin /* 29322ac5be4Sperrin * Callback vectors for replaying records. 29422ac5be4Sperrin * Only TX_WRITE is needed for zvol. 29522ac5be4Sperrin */ 29622ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 29722ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 29822ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 29922ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 30022ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 30122ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 30222ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 30322ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 30422ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 30522ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 30622ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 30722ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 30822ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 30922ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 31022ac5be4Sperrin }; 31122ac5be4Sperrin 312fa9e4066Sahrens /* 313fa9e4066Sahrens * Create a minor node for the specified volume. 314fa9e4066Sahrens */ 315fa9e4066Sahrens int 316e9dbad6fSeschrock zvol_create_minor(const char *name, dev_t dev) 317fa9e4066Sahrens { 318fa9e4066Sahrens zvol_state_t *zv; 319fa9e4066Sahrens objset_t *os; 320*67bd71c6Sperrin dmu_object_info_t doi; 321fa9e4066Sahrens uint64_t volsize; 322fa9e4066Sahrens minor_t minor = 0; 323fa9e4066Sahrens struct pathname linkpath; 324fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 325fa9e4066Sahrens vnode_t *vp = NULL; 326fa9e4066Sahrens char *devpath; 327fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 328fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 329fa9e4066Sahrens int error; 330fa9e4066Sahrens 331fa9e4066Sahrens mutex_enter(&zvol_state_lock); 332fa9e4066Sahrens 333fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 334fa9e4066Sahrens mutex_exit(&zvol_state_lock); 335fa9e4066Sahrens return (EEXIST); 336fa9e4066Sahrens } 337fa9e4066Sahrens 338fa9e4066Sahrens if (strchr(name, '@') != 0) 339fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 340fa9e4066Sahrens 341fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 342fa9e4066Sahrens 343fa9e4066Sahrens if (error) { 344fa9e4066Sahrens mutex_exit(&zvol_state_lock); 345fa9e4066Sahrens return (error); 346fa9e4066Sahrens } 347fa9e4066Sahrens 348fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 349fa9e4066Sahrens 350fa9e4066Sahrens if (error) { 351fa9e4066Sahrens dmu_objset_close(os); 352fa9e4066Sahrens mutex_exit(&zvol_state_lock); 353fa9e4066Sahrens return (error); 354fa9e4066Sahrens } 355fa9e4066Sahrens 356fa9e4066Sahrens /* 357fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 358fa9e4066Sahrens * same minor number we used last time. 359fa9e4066Sahrens */ 360fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 361fa9e4066Sahrens 362fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 363fa9e4066Sahrens 364fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 365fa9e4066Sahrens 366fa9e4066Sahrens kmem_free(devpath, devpathlen); 367fa9e4066Sahrens 368fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 369fa9e4066Sahrens error = EINVAL; 370fa9e4066Sahrens 371fa9e4066Sahrens if (error == 0) { 372fa9e4066Sahrens pn_alloc(&linkpath); 373fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 374fa9e4066Sahrens if (error == 0) { 375fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 376fa9e4066Sahrens if (ms != NULL) { 377fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 378fa9e4066Sahrens minor = stoi(&ms); 379fa9e4066Sahrens } 380fa9e4066Sahrens } 381fa9e4066Sahrens pn_free(&linkpath); 382fa9e4066Sahrens } 383fa9e4066Sahrens 384fa9e4066Sahrens if (vp != NULL) 385fa9e4066Sahrens VN_RELE(vp); 386fa9e4066Sahrens 387fa9e4066Sahrens /* 388fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 389fa9e4066Sahrens */ 390fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 391fa9e4066Sahrens minor = 0; 392fa9e4066Sahrens 393fa9e4066Sahrens if (minor == 0) 394fa9e4066Sahrens minor = zvol_minor_alloc(); 395fa9e4066Sahrens 396fa9e4066Sahrens if (minor == 0) { 397fa9e4066Sahrens dmu_objset_close(os); 398fa9e4066Sahrens mutex_exit(&zvol_state_lock); 399fa9e4066Sahrens return (ENXIO); 400fa9e4066Sahrens } 401fa9e4066Sahrens 402fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 403fa9e4066Sahrens dmu_objset_close(os); 404fa9e4066Sahrens mutex_exit(&zvol_state_lock); 405fa9e4066Sahrens return (EAGAIN); 406fa9e4066Sahrens } 407fa9e4066Sahrens 408e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 409e9dbad6fSeschrock (char *)name); 410fa9e4066Sahrens 411fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 412fa9e4066Sahrens 413fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 414fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 415fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 416fa9e4066Sahrens dmu_objset_close(os); 417fa9e4066Sahrens mutex_exit(&zvol_state_lock); 418fa9e4066Sahrens return (EAGAIN); 419fa9e4066Sahrens } 420fa9e4066Sahrens 421fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 422fa9e4066Sahrens 423fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 424fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 425fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 426fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 427fa9e4066Sahrens dmu_objset_close(os); 428fa9e4066Sahrens mutex_exit(&zvol_state_lock); 429fa9e4066Sahrens return (EAGAIN); 430fa9e4066Sahrens } 431fa9e4066Sahrens 432fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 433fa9e4066Sahrens 434fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 435fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 436fa9e4066Sahrens zv->zv_minor = minor; 437fa9e4066Sahrens zv->zv_volsize = volsize; 438fa9e4066Sahrens zv->zv_objset = os; 439fa9e4066Sahrens zv->zv_mode = ds_mode; 440*67bd71c6Sperrin zv->zv_zilog = zil_open(os, zvol_get_data); 441*67bd71c6Sperrin 442*67bd71c6Sperrin /* get and cache the blocksize */ 443*67bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 444*67bd71c6Sperrin ASSERT(error == 0); 445*67bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 44622ac5be4Sperrin 447a24e15ceSperrin rw_init(&zv->zv_dslock, NULL, RW_DEFAULT, NULL); 448a24e15ceSperrin 44922ac5be4Sperrin zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector, NULL); 450fa9e4066Sahrens 451fa9e4066Sahrens zvol_size_changed(zv, dev); 452fa9e4066Sahrens 453ea8dc4b6Seschrock /* XXX this should handle the possible i/o error */ 454fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 455fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 456fa9e4066Sahrens 457fa9e4066Sahrens zvol_minors++; 458fa9e4066Sahrens 459fa9e4066Sahrens mutex_exit(&zvol_state_lock); 460fa9e4066Sahrens 461fa9e4066Sahrens return (0); 462fa9e4066Sahrens } 463fa9e4066Sahrens 464fa9e4066Sahrens /* 465fa9e4066Sahrens * Remove minor node for the specified volume. 466fa9e4066Sahrens */ 467fa9e4066Sahrens int 468e9dbad6fSeschrock zvol_remove_minor(const char *name) 469fa9e4066Sahrens { 470fa9e4066Sahrens zvol_state_t *zv; 471fa9e4066Sahrens char namebuf[30]; 472fa9e4066Sahrens 473fa9e4066Sahrens mutex_enter(&zvol_state_lock); 474fa9e4066Sahrens 475e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 476fa9e4066Sahrens mutex_exit(&zvol_state_lock); 477fa9e4066Sahrens return (ENXIO); 478fa9e4066Sahrens } 479fa9e4066Sahrens 480fa9e4066Sahrens if (zv->zv_total_opens != 0) { 481fa9e4066Sahrens mutex_exit(&zvol_state_lock); 482fa9e4066Sahrens return (EBUSY); 483fa9e4066Sahrens } 484fa9e4066Sahrens 485fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 486fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 487fa9e4066Sahrens 488fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 489fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 490fa9e4066Sahrens 491fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 492fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 493fa9e4066Sahrens 49422ac5be4Sperrin zil_close(zv->zv_zilog); 49522ac5be4Sperrin zv->zv_zilog = NULL; 496fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 497fa9e4066Sahrens zv->zv_objset = NULL; 498fa9e4066Sahrens 499fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 500fa9e4066Sahrens 501fa9e4066Sahrens zvol_minors--; 502fa9e4066Sahrens 503fa9e4066Sahrens mutex_exit(&zvol_state_lock); 504fa9e4066Sahrens 505fa9e4066Sahrens return (0); 506fa9e4066Sahrens } 507fa9e4066Sahrens 508fa9e4066Sahrens int 509e9dbad6fSeschrock zvol_set_volsize(const char *name, dev_t dev, uint64_t volsize) 510fa9e4066Sahrens { 511fa9e4066Sahrens zvol_state_t *zv; 512fa9e4066Sahrens dmu_tx_t *tx; 513fa9e4066Sahrens int error; 5145c5460e9Seschrock dmu_object_info_t doi; 515fa9e4066Sahrens 516fa9e4066Sahrens mutex_enter(&zvol_state_lock); 517fa9e4066Sahrens 518e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 519fa9e4066Sahrens mutex_exit(&zvol_state_lock); 520fa9e4066Sahrens return (ENXIO); 521fa9e4066Sahrens } 522fa9e4066Sahrens 5235c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 524e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 525e9dbad6fSeschrock doi.doi_data_block_size)) != 0) { 5265c5460e9Seschrock mutex_exit(&zvol_state_lock); 5275c5460e9Seschrock return (error); 5285c5460e9Seschrock } 5295c5460e9Seschrock 530fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 531fa9e4066Sahrens mutex_exit(&zvol_state_lock); 532fa9e4066Sahrens return (EROFS); 533fa9e4066Sahrens } 534fa9e4066Sahrens 535fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 536ea8dc4b6Seschrock dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 537e9dbad6fSeschrock dmu_tx_hold_free(tx, ZVOL_OBJ, volsize, DMU_OBJECT_END); 538fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 539fa9e4066Sahrens if (error) { 540fa9e4066Sahrens dmu_tx_abort(tx); 541fa9e4066Sahrens mutex_exit(&zvol_state_lock); 542fa9e4066Sahrens return (error); 543fa9e4066Sahrens } 544fa9e4066Sahrens 545fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 546e9dbad6fSeschrock &volsize, tx); 547ea8dc4b6Seschrock if (error == 0) { 548e9dbad6fSeschrock error = dmu_free_range(zv->zv_objset, ZVOL_OBJ, volsize, 549fa9e4066Sahrens DMU_OBJECT_END, tx); 550ea8dc4b6Seschrock } 551fa9e4066Sahrens 552fa9e4066Sahrens dmu_tx_commit(tx); 553fa9e4066Sahrens 554fa9e4066Sahrens if (error == 0) { 555e9dbad6fSeschrock zv->zv_volsize = volsize; 556fa9e4066Sahrens zvol_size_changed(zv, dev); 557fa9e4066Sahrens } 558fa9e4066Sahrens 559fa9e4066Sahrens mutex_exit(&zvol_state_lock); 560fa9e4066Sahrens 561fa9e4066Sahrens return (error); 562fa9e4066Sahrens } 563fa9e4066Sahrens 564fa9e4066Sahrens int 565e9dbad6fSeschrock zvol_set_volblocksize(const char *name, uint64_t volblocksize) 566fa9e4066Sahrens { 567fa9e4066Sahrens zvol_state_t *zv; 568fa9e4066Sahrens dmu_tx_t *tx; 569fa9e4066Sahrens int error; 570fa9e4066Sahrens 571fa9e4066Sahrens mutex_enter(&zvol_state_lock); 572fa9e4066Sahrens 573e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 574fa9e4066Sahrens mutex_exit(&zvol_state_lock); 575fa9e4066Sahrens return (ENXIO); 576fa9e4066Sahrens } 577fa9e4066Sahrens 578fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 579fa9e4066Sahrens mutex_exit(&zvol_state_lock); 580fa9e4066Sahrens return (EROFS); 581fa9e4066Sahrens } 582fa9e4066Sahrens 583fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 584fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 585fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 586fa9e4066Sahrens if (error) { 587fa9e4066Sahrens dmu_tx_abort(tx); 588fa9e4066Sahrens } else { 589fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 590e9dbad6fSeschrock volblocksize, 0, tx); 591fa9e4066Sahrens if (error == ENOTSUP) 592fa9e4066Sahrens error = EBUSY; 593fa9e4066Sahrens dmu_tx_commit(tx); 594fa9e4066Sahrens } 595fa9e4066Sahrens 596fa9e4066Sahrens mutex_exit(&zvol_state_lock); 597fa9e4066Sahrens 598fa9e4066Sahrens return (error); 599fa9e4066Sahrens } 600fa9e4066Sahrens 601fa9e4066Sahrens /*ARGSUSED*/ 602fa9e4066Sahrens int 603fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 604fa9e4066Sahrens { 605fa9e4066Sahrens minor_t minor = getminor(*devp); 606fa9e4066Sahrens zvol_state_t *zv; 607fa9e4066Sahrens 608fa9e4066Sahrens if (minor == 0) /* This is the control device */ 609fa9e4066Sahrens return (0); 610fa9e4066Sahrens 611fa9e4066Sahrens mutex_enter(&zvol_state_lock); 612fa9e4066Sahrens 613fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 614fa9e4066Sahrens if (zv == NULL) { 615fa9e4066Sahrens mutex_exit(&zvol_state_lock); 616fa9e4066Sahrens return (ENXIO); 617fa9e4066Sahrens } 618fa9e4066Sahrens 619fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 620fa9e4066Sahrens 621fa9e4066Sahrens if ((flag & FWRITE) && 622fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 623fa9e4066Sahrens mutex_exit(&zvol_state_lock); 624fa9e4066Sahrens return (EROFS); 625fa9e4066Sahrens } 626fa9e4066Sahrens 627fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 628fa9e4066Sahrens zv->zv_open_count[otyp]++; 629fa9e4066Sahrens zv->zv_total_opens++; 630fa9e4066Sahrens } 631fa9e4066Sahrens 632fa9e4066Sahrens mutex_exit(&zvol_state_lock); 633fa9e4066Sahrens 634fa9e4066Sahrens return (0); 635fa9e4066Sahrens } 636fa9e4066Sahrens 637fa9e4066Sahrens /*ARGSUSED*/ 638fa9e4066Sahrens int 639fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 640fa9e4066Sahrens { 641fa9e4066Sahrens minor_t minor = getminor(dev); 642fa9e4066Sahrens zvol_state_t *zv; 643fa9e4066Sahrens 644fa9e4066Sahrens if (minor == 0) /* This is the control device */ 645fa9e4066Sahrens return (0); 646fa9e4066Sahrens 647fa9e4066Sahrens mutex_enter(&zvol_state_lock); 648fa9e4066Sahrens 649fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 650fa9e4066Sahrens if (zv == NULL) { 651fa9e4066Sahrens mutex_exit(&zvol_state_lock); 652fa9e4066Sahrens return (ENXIO); 653fa9e4066Sahrens } 654fa9e4066Sahrens 655fa9e4066Sahrens /* 656fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 657fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 658fa9e4066Sahrens */ 659fa9e4066Sahrens if (zv->zv_total_opens == 0) { 660fa9e4066Sahrens mutex_exit(&zvol_state_lock); 661fa9e4066Sahrens return (0); 662fa9e4066Sahrens } 663fa9e4066Sahrens 664fa9e4066Sahrens /* 665fa9e4066Sahrens * If the open count is zero, this is a spurious close. 666fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 667fa9e4066Sahrens */ 668fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 669fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 670fa9e4066Sahrens 671fa9e4066Sahrens /* 672fa9e4066Sahrens * You may get multiple opens, but only one close. 673fa9e4066Sahrens */ 674fa9e4066Sahrens zv->zv_open_count[otyp]--; 675fa9e4066Sahrens zv->zv_total_opens--; 676fa9e4066Sahrens 677fa9e4066Sahrens mutex_exit(&zvol_state_lock); 678fa9e4066Sahrens 679fa9e4066Sahrens return (0); 680fa9e4066Sahrens } 681fa9e4066Sahrens 68222ac5be4Sperrin /* 683a24e15ceSperrin * Create and return an immediate write ZIL transaction. 684a24e15ceSperrin */ 685a24e15ceSperrin itx_t * 686a24e15ceSperrin zvol_immediate_itx(offset_t off, ssize_t len, char *addr) 687a24e15ceSperrin { 688a24e15ceSperrin itx_t *itx; 689a24e15ceSperrin lr_write_t *lr; 690a24e15ceSperrin 691a24e15ceSperrin itx = zil_itx_create(TX_WRITE, sizeof (*lr) + len); 692a24e15ceSperrin lr = (lr_write_t *)&itx->itx_lr; 693a24e15ceSperrin lr->lr_foid = ZVOL_OBJ; 694a24e15ceSperrin lr->lr_offset = off; 695a24e15ceSperrin lr->lr_length = len; 696a24e15ceSperrin lr->lr_blkoff = 0; 697a24e15ceSperrin BP_ZERO(&lr->lr_blkptr); 698a24e15ceSperrin bcopy(addr, (char *)itx + offsetof(itx_t, itx_lr) + 699a24e15ceSperrin sizeof (*lr), len); 700a24e15ceSperrin itx->itx_wr_state = WR_COPIED; 701a24e15ceSperrin return (itx); 702a24e15ceSperrin } 703a24e15ceSperrin 704*67bd71c6Sperrin void 705*67bd71c6Sperrin zvol_get_done(dmu_buf_t *db, void *vzgd) 706*67bd71c6Sperrin { 707*67bd71c6Sperrin zgd_t *zgd = (zgd_t *)vzgd; 708*67bd71c6Sperrin 709*67bd71c6Sperrin dmu_buf_rele(db, vzgd); 710*67bd71c6Sperrin zil_add_vdev(zgd->zgd_zilog, DVA_GET_VDEV(BP_IDENTITY(zgd->zgd_bp))); 711*67bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 712*67bd71c6Sperrin } 713*67bd71c6Sperrin 714*67bd71c6Sperrin /* 715*67bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 716*67bd71c6Sperrin */ 717*67bd71c6Sperrin int 718*67bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 719*67bd71c6Sperrin { 720*67bd71c6Sperrin zvol_state_t *zv = arg; 721*67bd71c6Sperrin objset_t *os = zv->zv_objset; 722*67bd71c6Sperrin dmu_buf_t *db; 723*67bd71c6Sperrin zgd_t *zgd; 724*67bd71c6Sperrin int dlen = lr->lr_length; /* length of user data */ 725*67bd71c6Sperrin int error; 726*67bd71c6Sperrin 727*67bd71c6Sperrin ASSERT(zio); 728*67bd71c6Sperrin ASSERT(dlen != 0); 729*67bd71c6Sperrin ASSERT(buf == NULL); 730*67bd71c6Sperrin 731*67bd71c6Sperrin zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); 732*67bd71c6Sperrin zgd->zgd_zilog = zv->zv_zilog; 733*67bd71c6Sperrin zgd->zgd_bp = &lr->lr_blkptr; 734*67bd71c6Sperrin 735*67bd71c6Sperrin VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); 736*67bd71c6Sperrin /* 737*67bd71c6Sperrin * Have to lock to ensure when when the data is 738*67bd71c6Sperrin * written out and it's checksum is being calculated 739*67bd71c6Sperrin * that no one can change the data. 740*67bd71c6Sperrin */ 741*67bd71c6Sperrin rw_enter(&zv->zv_dslock, RW_READER); 742*67bd71c6Sperrin error = dmu_sync(zio, db, &lr->lr_blkptr, 743*67bd71c6Sperrin lr->lr_common.lrc_txg, zvol_get_done, zgd); 744*67bd71c6Sperrin rw_exit(&zv->zv_dslock); 745*67bd71c6Sperrin if (error == 0) { 746*67bd71c6Sperrin zil_add_vdev(zv->zv_zilog, 747*67bd71c6Sperrin DVA_GET_VDEV(BP_IDENTITY(&lr->lr_blkptr))); 748*67bd71c6Sperrin } 749*67bd71c6Sperrin /* 750*67bd71c6Sperrin * If we get EINPROGRESS, then we need to wait for a 751*67bd71c6Sperrin * write IO initiated by dmu_sync() to complete before 752*67bd71c6Sperrin * we can release this dbuf. We will finish everything 753*67bd71c6Sperrin * up in the zvol_get_done() callback. 754*67bd71c6Sperrin */ 755*67bd71c6Sperrin if (error == EINPROGRESS) 756*67bd71c6Sperrin return (0); 757*67bd71c6Sperrin dmu_buf_rele(db, zgd); 758*67bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 759*67bd71c6Sperrin return (error); 760*67bd71c6Sperrin } 761*67bd71c6Sperrin 762a24e15ceSperrin /* 763a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 76422ac5be4Sperrin * 76522ac5be4Sperrin * We store data in the log buffers if it's small enough. 766*67bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 76722ac5be4Sperrin */ 768*67bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 76922ac5be4Sperrin 770*67bd71c6Sperrin void 77122ac5be4Sperrin zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len, 77222ac5be4Sperrin char *addr) 77322ac5be4Sperrin { 774a24e15ceSperrin ssize_t nbytes; 77522ac5be4Sperrin itx_t *itx; 77622ac5be4Sperrin lr_write_t *lr; 777*67bd71c6Sperrin zilog_t *zilog = zv->zv_zilog; 778c5c6ffa0Smaybee uint64_t boff; 779a24e15ceSperrin uint32_t blocksize; 78022ac5be4Sperrin 781a24e15ceSperrin /* handle common case */ 782a24e15ceSperrin if (len <= zvol_immediate_write_sz) { 783a24e15ceSperrin itx = zvol_immediate_itx(off, len, addr); 784*67bd71c6Sperrin (void) zil_itx_assign(zilog, itx, tx); 785a24e15ceSperrin } 786a24e15ceSperrin 787*67bd71c6Sperrin blocksize = zv->zv_volblocksize; 78822ac5be4Sperrin 789a24e15ceSperrin while (len) { 790a24e15ceSperrin nbytes = MIN(len, blocksize - P2PHASE(off, blocksize)); 791a24e15ceSperrin if (nbytes <= zvol_immediate_write_sz) { 792a24e15ceSperrin itx = zvol_immediate_itx(off, nbytes, addr); 793a24e15ceSperrin } else { 794*67bd71c6Sperrin boff = P2ALIGN_TYPED(off, blocksize, uint64_t); 795a24e15ceSperrin itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 796*67bd71c6Sperrin itx->itx_wr_state = WR_INDIRECT; 797*67bd71c6Sperrin itx->itx_private = zv; 798a24e15ceSperrin lr = (lr_write_t *)&itx->itx_lr; 799a24e15ceSperrin lr->lr_foid = ZVOL_OBJ; 800a24e15ceSperrin lr->lr_offset = off; 801a24e15ceSperrin lr->lr_length = nbytes; 802c5c6ffa0Smaybee lr->lr_blkoff = off - boff; 803a24e15ceSperrin BP_ZERO(&lr->lr_blkptr); 80422ac5be4Sperrin } 805*67bd71c6Sperrin (void) zil_itx_assign(zilog, itx, tx); 806a24e15ceSperrin len -= nbytes; 807a24e15ceSperrin off += nbytes; 80822ac5be4Sperrin } 80922ac5be4Sperrin } 81022ac5be4Sperrin 811fa9e4066Sahrens int 812fa9e4066Sahrens zvol_strategy(buf_t *bp) 813fa9e4066Sahrens { 814fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 815fa9e4066Sahrens uint64_t off, volsize; 816fa9e4066Sahrens size_t size, resid; 817fa9e4066Sahrens char *addr; 81822ac5be4Sperrin objset_t *os; 819fa9e4066Sahrens int error = 0; 82022ac5be4Sperrin int sync; 821a24e15ceSperrin int reading; 822fa9e4066Sahrens 823fa9e4066Sahrens if (zv == NULL) { 824fa9e4066Sahrens bioerror(bp, ENXIO); 825fa9e4066Sahrens biodone(bp); 826fa9e4066Sahrens return (0); 827fa9e4066Sahrens } 828fa9e4066Sahrens 829fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 830fa9e4066Sahrens bioerror(bp, EINVAL); 831fa9e4066Sahrens biodone(bp); 832fa9e4066Sahrens return (0); 833fa9e4066Sahrens } 834fa9e4066Sahrens 835a2eea2e1Sahrens if ((zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) && 836a2eea2e1Sahrens !(bp->b_flags & B_READ)) { 837fa9e4066Sahrens bioerror(bp, EROFS); 838fa9e4066Sahrens biodone(bp); 839fa9e4066Sahrens return (0); 840fa9e4066Sahrens } 841fa9e4066Sahrens 842fa9e4066Sahrens off = ldbtob(bp->b_blkno); 843fa9e4066Sahrens volsize = zv->zv_volsize; 844fa9e4066Sahrens 84522ac5be4Sperrin os = zv->zv_objset; 84622ac5be4Sperrin ASSERT(os != NULL); 84722ac5be4Sperrin sync = !(bp->b_flags & B_ASYNC) && !(zil_disable); 848fa9e4066Sahrens 849fa9e4066Sahrens bp_mapin(bp); 850fa9e4066Sahrens addr = bp->b_un.b_addr; 851fa9e4066Sahrens resid = bp->b_bcount; 852fa9e4066Sahrens 853a24e15ceSperrin /* 854a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 855a24e15ceSperrin * we can't change the data whilst calculating the checksum. 856a24e15ceSperrin * A better approach than a per zvol rwlock would be to lock ranges. 857a24e15ceSperrin */ 858a24e15ceSperrin reading = bp->b_flags & B_READ; 859a24e15ceSperrin if (reading || resid <= zvol_immediate_write_sz) 860a24e15ceSperrin rw_enter(&zv->zv_dslock, RW_READER); 861a24e15ceSperrin else 862a24e15ceSperrin rw_enter(&zv->zv_dslock, RW_WRITER); 863a24e15ceSperrin 864fa9e4066Sahrens while (resid != 0 && off < volsize) { 865fa9e4066Sahrens 866*67bd71c6Sperrin size = MIN(resid, zvol_maxphys); /* zvol_maxphys per tx */ 867fa9e4066Sahrens 868fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 869fa9e4066Sahrens size = volsize - off; 870fa9e4066Sahrens 871a24e15ceSperrin if (reading) { 872a24e15ceSperrin error = dmu_read(os, ZVOL_OBJ, off, size, addr); 873fa9e4066Sahrens } else { 87422ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 875fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 876fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 877fa9e4066Sahrens if (error) { 878fa9e4066Sahrens dmu_tx_abort(tx); 879fa9e4066Sahrens } else { 88022ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 881*67bd71c6Sperrin /* add a log write transaction */ 882*67bd71c6Sperrin if (sync) 883*67bd71c6Sperrin zvol_log_write(zv, tx, off, size, addr); 884fa9e4066Sahrens dmu_tx_commit(tx); 885fa9e4066Sahrens } 886fa9e4066Sahrens } 887fa9e4066Sahrens if (error) 888fa9e4066Sahrens break; 889fa9e4066Sahrens off += size; 890fa9e4066Sahrens addr += size; 891fa9e4066Sahrens resid -= size; 892fa9e4066Sahrens } 893a24e15ceSperrin rw_exit(&zv->zv_dslock); 894fa9e4066Sahrens 895fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 896fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 897fa9e4066Sahrens 898fa9e4066Sahrens biodone(bp); 89922ac5be4Sperrin 900*67bd71c6Sperrin if (sync) 901*67bd71c6Sperrin zil_commit(zv->zv_zilog, UINT64_MAX, 0); 90222ac5be4Sperrin 903fa9e4066Sahrens return (0); 904fa9e4066Sahrens } 905fa9e4066Sahrens 906*67bd71c6Sperrin /* 907*67bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 908*67bd71c6Sperrin * Using our own routine instead of the default minphys() 909*67bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 910*67bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 911*67bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 912*67bd71c6Sperrin * 56K on X86 and 128K on sparc). 913*67bd71c6Sperrin */ 914*67bd71c6Sperrin void 915*67bd71c6Sperrin zvol_minphys(struct buf *bp) 916*67bd71c6Sperrin { 917*67bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 918*67bd71c6Sperrin bp->b_bcount = zvol_maxphys; 919*67bd71c6Sperrin } 920*67bd71c6Sperrin 921fa9e4066Sahrens /*ARGSUSED*/ 922fa9e4066Sahrens int 923fa9e4066Sahrens zvol_read(dev_t dev, uio_t *uiop, cred_t *cr) 924fa9e4066Sahrens { 925*67bd71c6Sperrin return (physio(zvol_strategy, NULL, dev, B_READ, zvol_minphys, uiop)); 926fa9e4066Sahrens } 927fa9e4066Sahrens 928fa9e4066Sahrens /*ARGSUSED*/ 929fa9e4066Sahrens int 930fa9e4066Sahrens zvol_write(dev_t dev, uio_t *uiop, cred_t *cr) 931fa9e4066Sahrens { 932*67bd71c6Sperrin return (physio(zvol_strategy, NULL, dev, B_WRITE, zvol_minphys, uiop)); 933fa9e4066Sahrens } 934fa9e4066Sahrens 935fa9e4066Sahrens /*ARGSUSED*/ 936fa9e4066Sahrens int 937fa9e4066Sahrens zvol_aread(dev_t dev, struct aio_req *aio, cred_t *cr) 938fa9e4066Sahrens { 939*67bd71c6Sperrin return (aphysio(zvol_strategy, anocancel, dev, B_READ, zvol_minphys, 940*67bd71c6Sperrin aio)); 941fa9e4066Sahrens } 942fa9e4066Sahrens 943fa9e4066Sahrens /*ARGSUSED*/ 944fa9e4066Sahrens int 945fa9e4066Sahrens zvol_awrite(dev_t dev, struct aio_req *aio, cred_t *cr) 946fa9e4066Sahrens { 947*67bd71c6Sperrin return (aphysio(zvol_strategy, anocancel, dev, B_WRITE, zvol_minphys, 948*67bd71c6Sperrin aio)); 949fa9e4066Sahrens } 950fa9e4066Sahrens 951fa9e4066Sahrens /* 952fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 953fa9e4066Sahrens */ 954fa9e4066Sahrens /*ARGSUSED*/ 955fa9e4066Sahrens int 956fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 957fa9e4066Sahrens { 958fa9e4066Sahrens zvol_state_t *zv; 959fa9e4066Sahrens struct dk_cinfo dkc; 960fa9e4066Sahrens struct dk_minfo dkm; 961fa9e4066Sahrens dk_efi_t efi; 962fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 963fa9e4066Sahrens uint32_t crc; 964fa9e4066Sahrens int error = 0; 965fa9e4066Sahrens 966fa9e4066Sahrens mutex_enter(&zvol_state_lock); 967fa9e4066Sahrens 968fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 969fa9e4066Sahrens 970fa9e4066Sahrens if (zv == NULL) { 971fa9e4066Sahrens mutex_exit(&zvol_state_lock); 972fa9e4066Sahrens return (ENXIO); 973fa9e4066Sahrens } 974fa9e4066Sahrens 975fa9e4066Sahrens switch (cmd) { 976fa9e4066Sahrens 977fa9e4066Sahrens case DKIOCINFO: 978fa9e4066Sahrens bzero(&dkc, sizeof (dkc)); 979fa9e4066Sahrens (void) strcpy(dkc.dki_cname, "zvol"); 980fa9e4066Sahrens (void) strcpy(dkc.dki_dname, "zvol"); 981fa9e4066Sahrens dkc.dki_ctype = DKC_UNKNOWN; 9828f8be083Sbonwick dkc.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 983fa9e4066Sahrens mutex_exit(&zvol_state_lock); 984fa9e4066Sahrens if (ddi_copyout(&dkc, (void *)arg, sizeof (dkc), flag)) 985fa9e4066Sahrens error = EFAULT; 986fa9e4066Sahrens return (error); 987fa9e4066Sahrens 988fa9e4066Sahrens case DKIOCGMEDIAINFO: 989fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 990fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 991fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 992fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 993fa9e4066Sahrens mutex_exit(&zvol_state_lock); 994fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 995fa9e4066Sahrens error = EFAULT; 996fa9e4066Sahrens return (error); 997fa9e4066Sahrens 998fa9e4066Sahrens case DKIOCGETEFI: 999fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 1000fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1001fa9e4066Sahrens return (EFAULT); 1002fa9e4066Sahrens } 100368a5ac4dSmaybee efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 1004fa9e4066Sahrens 100568a5ac4dSmaybee /* 100668a5ac4dSmaybee * Some clients may attempt to request a PMBR for the 100768a5ac4dSmaybee * zvol. Currently this interface will return ENOTTY to 100868a5ac4dSmaybee * such requests. These requests could be supported by 100968a5ac4dSmaybee * adding a check for lba == 0 and consing up an appropriate 101068a5ac4dSmaybee * RMBR. 101168a5ac4dSmaybee */ 101268a5ac4dSmaybee if (efi.dki_lba == 1) { 101368a5ac4dSmaybee efi_gpt_t gpt; 101468a5ac4dSmaybee efi_gpe_t gpe; 101568a5ac4dSmaybee 101668a5ac4dSmaybee bzero(&gpt, sizeof (gpt)); 101768a5ac4dSmaybee bzero(&gpe, sizeof (gpe)); 101868a5ac4dSmaybee 101968a5ac4dSmaybee if (efi.dki_length < sizeof (gpt)) { 102068a5ac4dSmaybee mutex_exit(&zvol_state_lock); 102168a5ac4dSmaybee return (EINVAL); 102268a5ac4dSmaybee } 1023fa9e4066Sahrens 102468a5ac4dSmaybee gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 102568a5ac4dSmaybee gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 102668a5ac4dSmaybee gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 102768a5ac4dSmaybee gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 102868a5ac4dSmaybee gpt.efi_gpt_LastUsableLBA = 102968a5ac4dSmaybee LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 103068a5ac4dSmaybee gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 103168a5ac4dSmaybee gpt.efi_gpt_PartitionEntryLBA = LE_32(2); 103268a5ac4dSmaybee gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 1033fa9e4066Sahrens 103468a5ac4dSmaybee UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 103568a5ac4dSmaybee gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 103668a5ac4dSmaybee gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 103768a5ac4dSmaybee 103868a5ac4dSmaybee CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 103968a5ac4dSmaybee gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1040fa9e4066Sahrens 104168a5ac4dSmaybee CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 104268a5ac4dSmaybee gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1043fa9e4066Sahrens 104468a5ac4dSmaybee mutex_exit(&zvol_state_lock); 104568a5ac4dSmaybee if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag)) 104668a5ac4dSmaybee error = EFAULT; 104768a5ac4dSmaybee } else if (efi.dki_lba == 2) { 104868a5ac4dSmaybee efi_gpe_t gpe; 1049fa9e4066Sahrens 105068a5ac4dSmaybee bzero(&gpe, sizeof (gpe)); 1051fa9e4066Sahrens 105268a5ac4dSmaybee if (efi.dki_length < sizeof (gpe)) { 105368a5ac4dSmaybee mutex_exit(&zvol_state_lock); 105468a5ac4dSmaybee return (EINVAL); 105568a5ac4dSmaybee } 1056fa9e4066Sahrens 105768a5ac4dSmaybee UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 105868a5ac4dSmaybee gpe.efi_gpe_StartingLBA = LE_64(34ULL); 105968a5ac4dSmaybee gpe.efi_gpe_EndingLBA = 106068a5ac4dSmaybee LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 1061fa9e4066Sahrens 106268a5ac4dSmaybee mutex_exit(&zvol_state_lock); 106368a5ac4dSmaybee if (ddi_copyout(&gpe, efi.dki_data, sizeof (gpe), flag)) 106468a5ac4dSmaybee error = EFAULT; 106568a5ac4dSmaybee } else { 106668a5ac4dSmaybee mutex_exit(&zvol_state_lock); 106768a5ac4dSmaybee error = EINVAL; 106868a5ac4dSmaybee } 1069fa9e4066Sahrens return (error); 1070fa9e4066Sahrens 1071fa9e4066Sahrens default: 107268a5ac4dSmaybee error = ENOTTY; 1073fa9e4066Sahrens break; 1074fa9e4066Sahrens 1075fa9e4066Sahrens } 1076fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1077fa9e4066Sahrens return (error); 1078fa9e4066Sahrens } 1079fa9e4066Sahrens 1080fa9e4066Sahrens int 1081fa9e4066Sahrens zvol_busy(void) 1082fa9e4066Sahrens { 1083fa9e4066Sahrens return (zvol_minors != 0); 1084fa9e4066Sahrens } 1085fa9e4066Sahrens 1086fa9e4066Sahrens void 1087fa9e4066Sahrens zvol_init(void) 1088fa9e4066Sahrens { 1089fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1090fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1091fa9e4066Sahrens } 1092fa9e4066Sahrens 1093fa9e4066Sahrens void 1094fa9e4066Sahrens zvol_fini(void) 1095fa9e4066Sahrens { 1096fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1097fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1098fa9e4066Sahrens } 1099