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 /* 22893a6d32Sahrens * Copyright 2007 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/uio.h> 46fa9e4066Sahrens #include <sys/buf.h> 47fa9e4066Sahrens #include <sys/modctl.h> 48fa9e4066Sahrens #include <sys/open.h> 49fa9e4066Sahrens #include <sys/kmem.h> 50fa9e4066Sahrens #include <sys/conf.h> 51fa9e4066Sahrens #include <sys/cmn_err.h> 52fa9e4066Sahrens #include <sys/stat.h> 53fa9e4066Sahrens #include <sys/zap.h> 54fa9e4066Sahrens #include <sys/spa.h> 55fa9e4066Sahrens #include <sys/zio.h> 56fa9e4066Sahrens #include <sys/dsl_prop.h> 57fa9e4066Sahrens #include <sys/dkio.h> 58fa9e4066Sahrens #include <sys/efi_partition.h> 59fa9e4066Sahrens #include <sys/byteorder.h> 60fa9e4066Sahrens #include <sys/pathname.h> 61fa9e4066Sahrens #include <sys/ddi.h> 62fa9e4066Sahrens #include <sys/sunddi.h> 63fa9e4066Sahrens #include <sys/crc32.h> 64fa9e4066Sahrens #include <sys/dirent.h> 65fa9e4066Sahrens #include <sys/policy.h> 66fa9e4066Sahrens #include <sys/fs/zfs.h> 67fa9e4066Sahrens #include <sys/zfs_ioctl.h> 68fa9e4066Sahrens #include <sys/mkdev.h> 6922ac5be4Sperrin #include <sys/zil.h> 70c5c6ffa0Smaybee #include <sys/refcount.h> 71*c2e6a7d6Sperrin #include <sys/zfs_znode.h> 72*c2e6a7d6Sperrin #include <sys/zfs_rlock.h> 73fa9e4066Sahrens 74fa9e4066Sahrens #include "zfs_namecheck.h" 75fa9e4066Sahrens 76fa9e4066Sahrens #define ZVOL_OBJ 1ULL 77fa9e4066Sahrens #define ZVOL_ZAP_OBJ 2ULL 78fa9e4066Sahrens 79fa9e4066Sahrens static void *zvol_state; 80fa9e4066Sahrens 81fa9e4066Sahrens /* 82fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 83fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 84fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 85fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 86fa9e4066Sahrens */ 87fa9e4066Sahrens static kmutex_t zvol_state_lock; 88fa9e4066Sahrens static uint32_t zvol_minors; 89fa9e4066Sahrens 90fa9e4066Sahrens /* 91fa9e4066Sahrens * The in-core state of each volume. 92fa9e4066Sahrens */ 93fa9e4066Sahrens typedef struct zvol_state { 94fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 95fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 9667bd71c6Sperrin uint64_t zv_volblocksize; /* volume block size */ 97fa9e4066Sahrens minor_t zv_minor; /* minor number */ 98fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 99fa9e4066Sahrens uint8_t zv_readonly; /* hard readonly; like write-protect */ 100fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 101fa9e4066Sahrens uint32_t zv_mode; /* DS_MODE_* flags at open time */ 102fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 103fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 10422ac5be4Sperrin zilog_t *zv_zilog; /* ZIL handle */ 10522ac5be4Sperrin uint64_t zv_txg_assign; /* txg to assign during ZIL replay */ 106*c2e6a7d6Sperrin znode_t zv_znode; /* for range locking */ 107fa9e4066Sahrens } zvol_state_t; 108fa9e4066Sahrens 10967bd71c6Sperrin /* 11067bd71c6Sperrin * zvol maximum transfer in one DMU tx. 11167bd71c6Sperrin */ 11267bd71c6Sperrin int zvol_maxphys = DMU_MAX_ACCESS/2; 11367bd71c6Sperrin 114feb08c6bSbillm static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); 11567bd71c6Sperrin 116fa9e4066Sahrens static void 117fa9e4066Sahrens zvol_size_changed(zvol_state_t *zv, dev_t dev) 118fa9e4066Sahrens { 119fa9e4066Sahrens dev = makedevice(getmajor(dev), zv->zv_minor); 120fa9e4066Sahrens 121fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 122fa9e4066Sahrens "Size", zv->zv_volsize) == DDI_SUCCESS); 123fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 124fa9e4066Sahrens "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); 125fa9e4066Sahrens } 126fa9e4066Sahrens 127fa9e4066Sahrens int 128e9dbad6fSeschrock zvol_check_volsize(uint64_t volsize, uint64_t blocksize) 129fa9e4066Sahrens { 130e9dbad6fSeschrock if (volsize == 0) 131fa9e4066Sahrens return (EINVAL); 132fa9e4066Sahrens 133e9dbad6fSeschrock if (volsize % blocksize != 0) 1345c5460e9Seschrock return (EINVAL); 1355c5460e9Seschrock 136fa9e4066Sahrens #ifdef _ILP32 137e9dbad6fSeschrock if (volsize - 1 > SPEC_MAXOFFSET_T) 138fa9e4066Sahrens return (EOVERFLOW); 139fa9e4066Sahrens #endif 140fa9e4066Sahrens return (0); 141fa9e4066Sahrens } 142fa9e4066Sahrens 143fa9e4066Sahrens int 144e9dbad6fSeschrock zvol_check_volblocksize(uint64_t volblocksize) 145fa9e4066Sahrens { 146e9dbad6fSeschrock if (volblocksize < SPA_MINBLOCKSIZE || 147e9dbad6fSeschrock volblocksize > SPA_MAXBLOCKSIZE || 148e9dbad6fSeschrock !ISP2(volblocksize)) 149fa9e4066Sahrens return (EDOM); 150fa9e4066Sahrens 151fa9e4066Sahrens return (0); 152fa9e4066Sahrens } 153fa9e4066Sahrens 154fa9e4066Sahrens static void 155fa9e4066Sahrens zvol_readonly_changed_cb(void *arg, uint64_t newval) 156fa9e4066Sahrens { 157fa9e4066Sahrens zvol_state_t *zv = arg; 158fa9e4066Sahrens 159fa9e4066Sahrens zv->zv_readonly = (uint8_t)newval; 160fa9e4066Sahrens } 161fa9e4066Sahrens 162fa9e4066Sahrens int 163a2eea2e1Sahrens zvol_get_stats(objset_t *os, nvlist_t *nv) 164fa9e4066Sahrens { 165fa9e4066Sahrens int error; 166fa9e4066Sahrens dmu_object_info_t doi; 167a2eea2e1Sahrens uint64_t val; 168fa9e4066Sahrens 169fa9e4066Sahrens 170a2eea2e1Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); 171fa9e4066Sahrens if (error) 172fa9e4066Sahrens return (error); 173fa9e4066Sahrens 174a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); 175a2eea2e1Sahrens 176fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 177fa9e4066Sahrens 178a2eea2e1Sahrens if (error == 0) { 179a2eea2e1Sahrens dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, 180a2eea2e1Sahrens doi.doi_data_block_size); 181a2eea2e1Sahrens } 182fa9e4066Sahrens 183fa9e4066Sahrens return (error); 184fa9e4066Sahrens } 185fa9e4066Sahrens 186fa9e4066Sahrens /* 187fa9e4066Sahrens * Find a free minor number. 188fa9e4066Sahrens */ 189fa9e4066Sahrens static minor_t 190fa9e4066Sahrens zvol_minor_alloc(void) 191fa9e4066Sahrens { 192fa9e4066Sahrens minor_t minor; 193fa9e4066Sahrens 194fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 195fa9e4066Sahrens 196fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 197fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 198fa9e4066Sahrens return (minor); 199fa9e4066Sahrens 200fa9e4066Sahrens return (0); 201fa9e4066Sahrens } 202fa9e4066Sahrens 203fa9e4066Sahrens static zvol_state_t * 204e9dbad6fSeschrock zvol_minor_lookup(const char *name) 205fa9e4066Sahrens { 206fa9e4066Sahrens minor_t minor; 207fa9e4066Sahrens zvol_state_t *zv; 208fa9e4066Sahrens 209fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 210fa9e4066Sahrens 211fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 212fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 213fa9e4066Sahrens if (zv == NULL) 214fa9e4066Sahrens continue; 215fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 216fa9e4066Sahrens break; 217fa9e4066Sahrens } 218fa9e4066Sahrens 219fa9e4066Sahrens return (zv); 220fa9e4066Sahrens } 221fa9e4066Sahrens 222fa9e4066Sahrens void 223fa9e4066Sahrens zvol_create_cb(objset_t *os, void *arg, dmu_tx_t *tx) 224fa9e4066Sahrens { 225e9dbad6fSeschrock zfs_create_data_t *zc = arg; 226fa9e4066Sahrens int error; 227e9dbad6fSeschrock uint64_t volblocksize, volsize; 228fa9e4066Sahrens 229e9dbad6fSeschrock VERIFY(nvlist_lookup_uint64(zc->zc_props, 230e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 231e9dbad6fSeschrock if (nvlist_lookup_uint64(zc->zc_props, 232e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 233e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 234e9dbad6fSeschrock 235e9dbad6fSeschrock /* 236e9dbad6fSeschrock * These properites must be removed from the list so the generic 237e9dbad6fSeschrock * property setting step won't apply to them. 238e9dbad6fSeschrock */ 239e9dbad6fSeschrock VERIFY(nvlist_remove_all(zc->zc_props, 240e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 241e9dbad6fSeschrock (void) nvlist_remove_all(zc->zc_props, 242e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 243e9dbad6fSeschrock 244e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 245fa9e4066Sahrens DMU_OT_NONE, 0, tx); 246fa9e4066Sahrens ASSERT(error == 0); 247fa9e4066Sahrens 248fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 249fa9e4066Sahrens DMU_OT_NONE, 0, tx); 250fa9e4066Sahrens ASSERT(error == 0); 251fa9e4066Sahrens 252e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 253fa9e4066Sahrens ASSERT(error == 0); 254fa9e4066Sahrens } 255fa9e4066Sahrens 25622ac5be4Sperrin /* 25722ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 25822ac5be4Sperrin * after a system failure 25922ac5be4Sperrin */ 26022ac5be4Sperrin static int 26122ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 26222ac5be4Sperrin { 26322ac5be4Sperrin objset_t *os = zv->zv_objset; 26422ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 26522ac5be4Sperrin uint64_t off = lr->lr_offset; 26622ac5be4Sperrin uint64_t len = lr->lr_length; 26722ac5be4Sperrin dmu_tx_t *tx; 26822ac5be4Sperrin int error; 26922ac5be4Sperrin 27022ac5be4Sperrin if (byteswap) 27122ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 27222ac5be4Sperrin 27322ac5be4Sperrin tx = dmu_tx_create(os); 27422ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 27522ac5be4Sperrin error = dmu_tx_assign(tx, zv->zv_txg_assign); 27622ac5be4Sperrin if (error) { 27722ac5be4Sperrin dmu_tx_abort(tx); 27822ac5be4Sperrin } else { 27922ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 28022ac5be4Sperrin dmu_tx_commit(tx); 28122ac5be4Sperrin } 28222ac5be4Sperrin 28322ac5be4Sperrin return (error); 28422ac5be4Sperrin } 28522ac5be4Sperrin 28622ac5be4Sperrin /* ARGSUSED */ 28722ac5be4Sperrin static int 28822ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 28922ac5be4Sperrin { 29022ac5be4Sperrin return (ENOTSUP); 29122ac5be4Sperrin } 29222ac5be4Sperrin 29322ac5be4Sperrin /* 29422ac5be4Sperrin * Callback vectors for replaying records. 29522ac5be4Sperrin * Only TX_WRITE is needed for zvol. 29622ac5be4Sperrin */ 29722ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 29822ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 29922ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 30022ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 30122ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 30222ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 30322ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 30422ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 30522ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 30622ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 30722ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 30822ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 30922ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 31022ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 31122ac5be4Sperrin }; 31222ac5be4Sperrin 313fa9e4066Sahrens /* 314fa9e4066Sahrens * Create a minor node for the specified volume. 315fa9e4066Sahrens */ 316fa9e4066Sahrens int 317e9dbad6fSeschrock zvol_create_minor(const char *name, dev_t dev) 318fa9e4066Sahrens { 319fa9e4066Sahrens zvol_state_t *zv; 320fa9e4066Sahrens objset_t *os; 32167bd71c6Sperrin dmu_object_info_t doi; 322fa9e4066Sahrens uint64_t volsize; 323fa9e4066Sahrens minor_t minor = 0; 324fa9e4066Sahrens struct pathname linkpath; 325fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 326fa9e4066Sahrens vnode_t *vp = NULL; 327fa9e4066Sahrens char *devpath; 328fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 329fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 330fa9e4066Sahrens int error; 331fa9e4066Sahrens 332fa9e4066Sahrens mutex_enter(&zvol_state_lock); 333fa9e4066Sahrens 334fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 335fa9e4066Sahrens mutex_exit(&zvol_state_lock); 336fa9e4066Sahrens return (EEXIST); 337fa9e4066Sahrens } 338fa9e4066Sahrens 339fa9e4066Sahrens if (strchr(name, '@') != 0) 340fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 341fa9e4066Sahrens 342fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 343fa9e4066Sahrens 344fa9e4066Sahrens if (error) { 345fa9e4066Sahrens mutex_exit(&zvol_state_lock); 346fa9e4066Sahrens return (error); 347fa9e4066Sahrens } 348fa9e4066Sahrens 349fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 350fa9e4066Sahrens 351fa9e4066Sahrens if (error) { 352fa9e4066Sahrens dmu_objset_close(os); 353fa9e4066Sahrens mutex_exit(&zvol_state_lock); 354fa9e4066Sahrens return (error); 355fa9e4066Sahrens } 356fa9e4066Sahrens 357fa9e4066Sahrens /* 358fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 359fa9e4066Sahrens * same minor number we used last time. 360fa9e4066Sahrens */ 361fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 362fa9e4066Sahrens 363fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 364fa9e4066Sahrens 365fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 366fa9e4066Sahrens 367fa9e4066Sahrens kmem_free(devpath, devpathlen); 368fa9e4066Sahrens 369fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 370fa9e4066Sahrens error = EINVAL; 371fa9e4066Sahrens 372fa9e4066Sahrens if (error == 0) { 373fa9e4066Sahrens pn_alloc(&linkpath); 374fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 375fa9e4066Sahrens if (error == 0) { 376fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 377fa9e4066Sahrens if (ms != NULL) { 378fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 379fa9e4066Sahrens minor = stoi(&ms); 380fa9e4066Sahrens } 381fa9e4066Sahrens } 382fa9e4066Sahrens pn_free(&linkpath); 383fa9e4066Sahrens } 384fa9e4066Sahrens 385fa9e4066Sahrens if (vp != NULL) 386fa9e4066Sahrens VN_RELE(vp); 387fa9e4066Sahrens 388fa9e4066Sahrens /* 389fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 390fa9e4066Sahrens */ 391fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 392fa9e4066Sahrens minor = 0; 393fa9e4066Sahrens 394fa9e4066Sahrens if (minor == 0) 395fa9e4066Sahrens minor = zvol_minor_alloc(); 396fa9e4066Sahrens 397fa9e4066Sahrens if (minor == 0) { 398fa9e4066Sahrens dmu_objset_close(os); 399fa9e4066Sahrens mutex_exit(&zvol_state_lock); 400fa9e4066Sahrens return (ENXIO); 401fa9e4066Sahrens } 402fa9e4066Sahrens 403fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 404fa9e4066Sahrens dmu_objset_close(os); 405fa9e4066Sahrens mutex_exit(&zvol_state_lock); 406fa9e4066Sahrens return (EAGAIN); 407fa9e4066Sahrens } 408fa9e4066Sahrens 409e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 410e9dbad6fSeschrock (char *)name); 411fa9e4066Sahrens 412fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 413fa9e4066Sahrens 414fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 415fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 416fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 417fa9e4066Sahrens dmu_objset_close(os); 418fa9e4066Sahrens mutex_exit(&zvol_state_lock); 419fa9e4066Sahrens return (EAGAIN); 420fa9e4066Sahrens } 421fa9e4066Sahrens 422fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 423fa9e4066Sahrens 424fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 425fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 426fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 427fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 428fa9e4066Sahrens dmu_objset_close(os); 429fa9e4066Sahrens mutex_exit(&zvol_state_lock); 430fa9e4066Sahrens return (EAGAIN); 431fa9e4066Sahrens } 432fa9e4066Sahrens 433fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 434fa9e4066Sahrens 435fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 436fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 437fa9e4066Sahrens zv->zv_minor = minor; 438fa9e4066Sahrens zv->zv_volsize = volsize; 439fa9e4066Sahrens zv->zv_objset = os; 440fa9e4066Sahrens zv->zv_mode = ds_mode; 44167bd71c6Sperrin zv->zv_zilog = zil_open(os, zvol_get_data); 442*c2e6a7d6Sperrin mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 443*c2e6a7d6Sperrin avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 444*c2e6a7d6Sperrin sizeof (rl_t), offsetof(rl_t, r_node)); 445*c2e6a7d6Sperrin 44667bd71c6Sperrin 44767bd71c6Sperrin /* get and cache the blocksize */ 44867bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 44967bd71c6Sperrin ASSERT(error == 0); 45067bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 45122ac5be4Sperrin 452893a6d32Sahrens zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector); 453fa9e4066Sahrens 454fa9e4066Sahrens zvol_size_changed(zv, dev); 455fa9e4066Sahrens 456ea8dc4b6Seschrock /* XXX this should handle the possible i/o error */ 457fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 458fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 459fa9e4066Sahrens 460fa9e4066Sahrens zvol_minors++; 461fa9e4066Sahrens 462fa9e4066Sahrens mutex_exit(&zvol_state_lock); 463fa9e4066Sahrens 464fa9e4066Sahrens return (0); 465fa9e4066Sahrens } 466fa9e4066Sahrens 467fa9e4066Sahrens /* 468fa9e4066Sahrens * Remove minor node for the specified volume. 469fa9e4066Sahrens */ 470fa9e4066Sahrens int 471e9dbad6fSeschrock zvol_remove_minor(const char *name) 472fa9e4066Sahrens { 473fa9e4066Sahrens zvol_state_t *zv; 474fa9e4066Sahrens char namebuf[30]; 475fa9e4066Sahrens 476fa9e4066Sahrens mutex_enter(&zvol_state_lock); 477fa9e4066Sahrens 478e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 479fa9e4066Sahrens mutex_exit(&zvol_state_lock); 480fa9e4066Sahrens return (ENXIO); 481fa9e4066Sahrens } 482fa9e4066Sahrens 483fa9e4066Sahrens if (zv->zv_total_opens != 0) { 484fa9e4066Sahrens mutex_exit(&zvol_state_lock); 485fa9e4066Sahrens return (EBUSY); 486fa9e4066Sahrens } 487fa9e4066Sahrens 488fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 489fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 490fa9e4066Sahrens 491fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 492fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 493fa9e4066Sahrens 494fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 495fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 496fa9e4066Sahrens 49722ac5be4Sperrin zil_close(zv->zv_zilog); 49822ac5be4Sperrin zv->zv_zilog = NULL; 499fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 500fa9e4066Sahrens zv->zv_objset = NULL; 501*c2e6a7d6Sperrin avl_destroy(&zv->zv_znode.z_range_avl); 502*c2e6a7d6Sperrin mutex_destroy(&zv->zv_znode.z_range_lock); 503fa9e4066Sahrens 504fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 505fa9e4066Sahrens 506fa9e4066Sahrens zvol_minors--; 507fa9e4066Sahrens 508fa9e4066Sahrens mutex_exit(&zvol_state_lock); 509fa9e4066Sahrens 510fa9e4066Sahrens return (0); 511fa9e4066Sahrens } 512fa9e4066Sahrens 513fa9e4066Sahrens int 514e9dbad6fSeschrock zvol_set_volsize(const char *name, dev_t dev, uint64_t volsize) 515fa9e4066Sahrens { 516fa9e4066Sahrens zvol_state_t *zv; 517fa9e4066Sahrens dmu_tx_t *tx; 518fa9e4066Sahrens int error; 5195c5460e9Seschrock dmu_object_info_t doi; 520fa9e4066Sahrens 521fa9e4066Sahrens mutex_enter(&zvol_state_lock); 522fa9e4066Sahrens 523e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 524fa9e4066Sahrens mutex_exit(&zvol_state_lock); 525fa9e4066Sahrens return (ENXIO); 526fa9e4066Sahrens } 527fa9e4066Sahrens 5285c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 529e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 530e9dbad6fSeschrock doi.doi_data_block_size)) != 0) { 5315c5460e9Seschrock mutex_exit(&zvol_state_lock); 5325c5460e9Seschrock return (error); 5335c5460e9Seschrock } 5345c5460e9Seschrock 535fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 536fa9e4066Sahrens mutex_exit(&zvol_state_lock); 537fa9e4066Sahrens return (EROFS); 538fa9e4066Sahrens } 539fa9e4066Sahrens 540fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 541ea8dc4b6Seschrock dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 542e9dbad6fSeschrock dmu_tx_hold_free(tx, ZVOL_OBJ, volsize, DMU_OBJECT_END); 543fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 544fa9e4066Sahrens if (error) { 545fa9e4066Sahrens dmu_tx_abort(tx); 546fa9e4066Sahrens mutex_exit(&zvol_state_lock); 547fa9e4066Sahrens return (error); 548fa9e4066Sahrens } 549fa9e4066Sahrens 550fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 551e9dbad6fSeschrock &volsize, tx); 552ea8dc4b6Seschrock if (error == 0) { 553e9dbad6fSeschrock error = dmu_free_range(zv->zv_objset, ZVOL_OBJ, volsize, 554fa9e4066Sahrens DMU_OBJECT_END, tx); 555ea8dc4b6Seschrock } 556fa9e4066Sahrens 557fa9e4066Sahrens dmu_tx_commit(tx); 558fa9e4066Sahrens 559fa9e4066Sahrens if (error == 0) { 560e9dbad6fSeschrock zv->zv_volsize = volsize; 561fa9e4066Sahrens zvol_size_changed(zv, dev); 562fa9e4066Sahrens } 563fa9e4066Sahrens 564fa9e4066Sahrens mutex_exit(&zvol_state_lock); 565fa9e4066Sahrens 566fa9e4066Sahrens return (error); 567fa9e4066Sahrens } 568fa9e4066Sahrens 569fa9e4066Sahrens int 570e9dbad6fSeschrock zvol_set_volblocksize(const char *name, uint64_t volblocksize) 571fa9e4066Sahrens { 572fa9e4066Sahrens zvol_state_t *zv; 573fa9e4066Sahrens dmu_tx_t *tx; 574fa9e4066Sahrens int error; 575fa9e4066Sahrens 576fa9e4066Sahrens mutex_enter(&zvol_state_lock); 577fa9e4066Sahrens 578e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 579fa9e4066Sahrens mutex_exit(&zvol_state_lock); 580fa9e4066Sahrens return (ENXIO); 581fa9e4066Sahrens } 582fa9e4066Sahrens 583fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 584fa9e4066Sahrens mutex_exit(&zvol_state_lock); 585fa9e4066Sahrens return (EROFS); 586fa9e4066Sahrens } 587fa9e4066Sahrens 588fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 589fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 590fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 591fa9e4066Sahrens if (error) { 592fa9e4066Sahrens dmu_tx_abort(tx); 593fa9e4066Sahrens } else { 594fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 595e9dbad6fSeschrock volblocksize, 0, tx); 596fa9e4066Sahrens if (error == ENOTSUP) 597fa9e4066Sahrens error = EBUSY; 598fa9e4066Sahrens dmu_tx_commit(tx); 599fa9e4066Sahrens } 600fa9e4066Sahrens 601fa9e4066Sahrens mutex_exit(&zvol_state_lock); 602fa9e4066Sahrens 603fa9e4066Sahrens return (error); 604fa9e4066Sahrens } 605fa9e4066Sahrens 606fa9e4066Sahrens /*ARGSUSED*/ 607fa9e4066Sahrens int 608fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 609fa9e4066Sahrens { 610fa9e4066Sahrens minor_t minor = getminor(*devp); 611fa9e4066Sahrens zvol_state_t *zv; 612fa9e4066Sahrens 613fa9e4066Sahrens if (minor == 0) /* This is the control device */ 614fa9e4066Sahrens return (0); 615fa9e4066Sahrens 616fa9e4066Sahrens mutex_enter(&zvol_state_lock); 617fa9e4066Sahrens 618fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 619fa9e4066Sahrens if (zv == NULL) { 620fa9e4066Sahrens mutex_exit(&zvol_state_lock); 621fa9e4066Sahrens return (ENXIO); 622fa9e4066Sahrens } 623fa9e4066Sahrens 624fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 625fa9e4066Sahrens 626fa9e4066Sahrens if ((flag & FWRITE) && 627fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 628fa9e4066Sahrens mutex_exit(&zvol_state_lock); 629fa9e4066Sahrens return (EROFS); 630fa9e4066Sahrens } 631fa9e4066Sahrens 632fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 633fa9e4066Sahrens zv->zv_open_count[otyp]++; 634fa9e4066Sahrens zv->zv_total_opens++; 635fa9e4066Sahrens } 636fa9e4066Sahrens 637fa9e4066Sahrens mutex_exit(&zvol_state_lock); 638fa9e4066Sahrens 639fa9e4066Sahrens return (0); 640fa9e4066Sahrens } 641fa9e4066Sahrens 642fa9e4066Sahrens /*ARGSUSED*/ 643fa9e4066Sahrens int 644fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 645fa9e4066Sahrens { 646fa9e4066Sahrens minor_t minor = getminor(dev); 647fa9e4066Sahrens zvol_state_t *zv; 648fa9e4066Sahrens 649fa9e4066Sahrens if (minor == 0) /* This is the control device */ 650fa9e4066Sahrens return (0); 651fa9e4066Sahrens 652fa9e4066Sahrens mutex_enter(&zvol_state_lock); 653fa9e4066Sahrens 654fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 655fa9e4066Sahrens if (zv == NULL) { 656fa9e4066Sahrens mutex_exit(&zvol_state_lock); 657fa9e4066Sahrens return (ENXIO); 658fa9e4066Sahrens } 659fa9e4066Sahrens 660fa9e4066Sahrens /* 661fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 662fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 663fa9e4066Sahrens */ 664fa9e4066Sahrens if (zv->zv_total_opens == 0) { 665fa9e4066Sahrens mutex_exit(&zvol_state_lock); 666fa9e4066Sahrens return (0); 667fa9e4066Sahrens } 668fa9e4066Sahrens 669fa9e4066Sahrens /* 670fa9e4066Sahrens * If the open count is zero, this is a spurious close. 671fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 672fa9e4066Sahrens */ 673fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 674fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 675fa9e4066Sahrens 676fa9e4066Sahrens /* 677fa9e4066Sahrens * You may get multiple opens, but only one close. 678fa9e4066Sahrens */ 679fa9e4066Sahrens zv->zv_open_count[otyp]--; 680fa9e4066Sahrens zv->zv_total_opens--; 681fa9e4066Sahrens 682fa9e4066Sahrens mutex_exit(&zvol_state_lock); 683fa9e4066Sahrens 684fa9e4066Sahrens return (0); 685fa9e4066Sahrens } 686fa9e4066Sahrens 687feb08c6bSbillm static void 68867bd71c6Sperrin zvol_get_done(dmu_buf_t *db, void *vzgd) 68967bd71c6Sperrin { 69067bd71c6Sperrin zgd_t *zgd = (zgd_t *)vzgd; 691*c2e6a7d6Sperrin rl_t *rl = zgd->zgd_rl; 69267bd71c6Sperrin 69367bd71c6Sperrin dmu_buf_rele(db, vzgd); 694*c2e6a7d6Sperrin zfs_range_unlock(rl); 69567bd71c6Sperrin zil_add_vdev(zgd->zgd_zilog, DVA_GET_VDEV(BP_IDENTITY(zgd->zgd_bp))); 69667bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 69767bd71c6Sperrin } 69867bd71c6Sperrin 69967bd71c6Sperrin /* 70067bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 70167bd71c6Sperrin */ 702feb08c6bSbillm static int 70367bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 70467bd71c6Sperrin { 70567bd71c6Sperrin zvol_state_t *zv = arg; 70667bd71c6Sperrin objset_t *os = zv->zv_objset; 70767bd71c6Sperrin dmu_buf_t *db; 708*c2e6a7d6Sperrin rl_t *rl; 70967bd71c6Sperrin zgd_t *zgd; 710*c2e6a7d6Sperrin uint64_t boff; /* block starting offset */ 711*c2e6a7d6Sperrin int dlen = lr->lr_length; /* length of user data */ 71267bd71c6Sperrin int error; 71367bd71c6Sperrin 71467bd71c6Sperrin ASSERT(zio); 715*c2e6a7d6Sperrin ASSERT(dlen != 0); 716feb08c6bSbillm 717*c2e6a7d6Sperrin /* 718*c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 719*c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 720*c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 721*c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 722*c2e6a7d6Sperrin * we don't have to write the data twice. 723*c2e6a7d6Sperrin */ 724*c2e6a7d6Sperrin if (buf != NULL) /* immediate write */ 725*c2e6a7d6Sperrin return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf)); 72667bd71c6Sperrin 72767bd71c6Sperrin zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); 72867bd71c6Sperrin zgd->zgd_zilog = zv->zv_zilog; 72967bd71c6Sperrin zgd->zgd_bp = &lr->lr_blkptr; 73067bd71c6Sperrin 73167bd71c6Sperrin /* 732*c2e6a7d6Sperrin * Lock the range of the block to ensure that when the data is 733*c2e6a7d6Sperrin * written out and it's checksum is being calculated that no other 734*c2e6a7d6Sperrin * thread can change the block. 73567bd71c6Sperrin */ 736*c2e6a7d6Sperrin boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t); 737*c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize, 738*c2e6a7d6Sperrin RL_READER); 739*c2e6a7d6Sperrin zgd->zgd_rl = rl; 740*c2e6a7d6Sperrin 741*c2e6a7d6Sperrin VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); 74267bd71c6Sperrin error = dmu_sync(zio, db, &lr->lr_blkptr, 74367bd71c6Sperrin lr->lr_common.lrc_txg, zvol_get_done, zgd); 744feb08c6bSbillm if (error == 0) 74567bd71c6Sperrin zil_add_vdev(zv->zv_zilog, 74667bd71c6Sperrin DVA_GET_VDEV(BP_IDENTITY(&lr->lr_blkptr))); 74767bd71c6Sperrin /* 74867bd71c6Sperrin * If we get EINPROGRESS, then we need to wait for a 74967bd71c6Sperrin * write IO initiated by dmu_sync() to complete before 75067bd71c6Sperrin * we can release this dbuf. We will finish everything 75167bd71c6Sperrin * up in the zvol_get_done() callback. 75267bd71c6Sperrin */ 75367bd71c6Sperrin if (error == EINPROGRESS) 75467bd71c6Sperrin return (0); 75567bd71c6Sperrin dmu_buf_rele(db, zgd); 756*c2e6a7d6Sperrin zfs_range_unlock(rl); 75767bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 75867bd71c6Sperrin return (error); 75967bd71c6Sperrin } 76067bd71c6Sperrin 761a24e15ceSperrin /* 762a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 76322ac5be4Sperrin * 76422ac5be4Sperrin * We store data in the log buffers if it's small enough. 76567bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 76622ac5be4Sperrin */ 76767bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 76822ac5be4Sperrin 769feb08c6bSbillm static void 770feb08c6bSbillm zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len) 77122ac5be4Sperrin { 772feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 77322ac5be4Sperrin lr_write_t *lr; 77422ac5be4Sperrin 775a24e15ceSperrin while (len) { 776feb08c6bSbillm ssize_t nbytes = MIN(len, blocksize - P2PHASE(off, blocksize)); 777feb08c6bSbillm itx_t *itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 778feb08c6bSbillm 779feb08c6bSbillm itx->itx_wr_state = 780feb08c6bSbillm len > zvol_immediate_write_sz ? WR_INDIRECT : WR_NEED_COPY; 781feb08c6bSbillm itx->itx_private = zv; 782feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 783feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 784feb08c6bSbillm lr->lr_offset = off; 785feb08c6bSbillm lr->lr_length = nbytes; 786feb08c6bSbillm lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t); 787feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 788feb08c6bSbillm 789feb08c6bSbillm (void) zil_itx_assign(zv->zv_zilog, itx, tx); 790a24e15ceSperrin len -= nbytes; 791a24e15ceSperrin off += nbytes; 79222ac5be4Sperrin } 79322ac5be4Sperrin } 79422ac5be4Sperrin 795fa9e4066Sahrens int 796fa9e4066Sahrens zvol_strategy(buf_t *bp) 797fa9e4066Sahrens { 798fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 799fa9e4066Sahrens uint64_t off, volsize; 800fa9e4066Sahrens size_t size, resid; 801fa9e4066Sahrens char *addr; 80222ac5be4Sperrin objset_t *os; 803*c2e6a7d6Sperrin rl_t *rl; 804fa9e4066Sahrens int error = 0; 80522ac5be4Sperrin int sync; 806*c2e6a7d6Sperrin boolean_t reading; 807fa9e4066Sahrens 808fa9e4066Sahrens if (zv == NULL) { 809fa9e4066Sahrens bioerror(bp, ENXIO); 810fa9e4066Sahrens biodone(bp); 811fa9e4066Sahrens return (0); 812fa9e4066Sahrens } 813fa9e4066Sahrens 814fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 815fa9e4066Sahrens bioerror(bp, EINVAL); 816fa9e4066Sahrens biodone(bp); 817fa9e4066Sahrens return (0); 818fa9e4066Sahrens } 819fa9e4066Sahrens 820a2eea2e1Sahrens if ((zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) && 821a2eea2e1Sahrens !(bp->b_flags & B_READ)) { 822fa9e4066Sahrens bioerror(bp, EROFS); 823fa9e4066Sahrens biodone(bp); 824fa9e4066Sahrens return (0); 825fa9e4066Sahrens } 826fa9e4066Sahrens 827fa9e4066Sahrens off = ldbtob(bp->b_blkno); 828fa9e4066Sahrens volsize = zv->zv_volsize; 829fa9e4066Sahrens 83022ac5be4Sperrin os = zv->zv_objset; 83122ac5be4Sperrin ASSERT(os != NULL); 83222ac5be4Sperrin sync = !(bp->b_flags & B_ASYNC) && !(zil_disable); 833fa9e4066Sahrens 834fa9e4066Sahrens bp_mapin(bp); 835fa9e4066Sahrens addr = bp->b_un.b_addr; 836fa9e4066Sahrens resid = bp->b_bcount; 837fa9e4066Sahrens 838a24e15ceSperrin /* 839a24e15ceSperrin * There must be no buffer changes when doing a dmu_sync() because 840a24e15ceSperrin * we can't change the data whilst calculating the checksum. 841a24e15ceSperrin * A better approach than a per zvol rwlock would be to lock ranges. 842a24e15ceSperrin */ 843a24e15ceSperrin reading = bp->b_flags & B_READ; 844*c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 845*c2e6a7d6Sperrin reading ? RL_READER : RL_WRITER); 846a24e15ceSperrin 847fa9e4066Sahrens while (resid != 0 && off < volsize) { 848fa9e4066Sahrens 84967bd71c6Sperrin size = MIN(resid, zvol_maxphys); /* zvol_maxphys per tx */ 850fa9e4066Sahrens 851fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 852fa9e4066Sahrens size = volsize - off; 853fa9e4066Sahrens 854a24e15ceSperrin if (reading) { 855a24e15ceSperrin error = dmu_read(os, ZVOL_OBJ, off, size, addr); 856fa9e4066Sahrens } else { 85722ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 858fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 859fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 860fa9e4066Sahrens if (error) { 861fa9e4066Sahrens dmu_tx_abort(tx); 862fa9e4066Sahrens } else { 86322ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 864feb08c6bSbillm zvol_log_write(zv, tx, off, size); 865fa9e4066Sahrens dmu_tx_commit(tx); 866fa9e4066Sahrens } 867fa9e4066Sahrens } 868fa9e4066Sahrens if (error) 869fa9e4066Sahrens break; 870fa9e4066Sahrens off += size; 871fa9e4066Sahrens addr += size; 872fa9e4066Sahrens resid -= size; 873fa9e4066Sahrens } 874*c2e6a7d6Sperrin zfs_range_unlock(rl); 875fa9e4066Sahrens 876fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 877fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 878fa9e4066Sahrens 87967bd71c6Sperrin if (sync) 880feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 881feb08c6bSbillm 882feb08c6bSbillm biodone(bp); 88322ac5be4Sperrin 884fa9e4066Sahrens return (0); 885fa9e4066Sahrens } 886fa9e4066Sahrens 88767bd71c6Sperrin /* 88867bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 88967bd71c6Sperrin * Using our own routine instead of the default minphys() 89067bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 89167bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 89267bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 89367bd71c6Sperrin * 56K on X86 and 128K on sparc). 89467bd71c6Sperrin */ 89567bd71c6Sperrin void 89667bd71c6Sperrin zvol_minphys(struct buf *bp) 89767bd71c6Sperrin { 89867bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 89967bd71c6Sperrin bp->b_bcount = zvol_maxphys; 90067bd71c6Sperrin } 90167bd71c6Sperrin 902fa9e4066Sahrens /*ARGSUSED*/ 903fa9e4066Sahrens int 904feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 905fa9e4066Sahrens { 906feb08c6bSbillm zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(dev)); 907*c2e6a7d6Sperrin rl_t *rl; 908feb08c6bSbillm int error = 0; 909fa9e4066Sahrens 910*c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 911*c2e6a7d6Sperrin RL_READER); 912feb08c6bSbillm while (uio->uio_resid > 0) { 913feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 914fa9e4066Sahrens 915feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 916feb08c6bSbillm if (error) 917feb08c6bSbillm break; 918feb08c6bSbillm } 919*c2e6a7d6Sperrin zfs_range_unlock(rl); 920feb08c6bSbillm return (error); 921fa9e4066Sahrens } 922fa9e4066Sahrens 923fa9e4066Sahrens /*ARGSUSED*/ 924fa9e4066Sahrens int 925feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 926fa9e4066Sahrens { 927feb08c6bSbillm zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(dev)); 928*c2e6a7d6Sperrin rl_t *rl; 929feb08c6bSbillm int error = 0; 930feb08c6bSbillm 931*c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 932*c2e6a7d6Sperrin RL_WRITER); 933feb08c6bSbillm while (uio->uio_resid > 0) { 934feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 935feb08c6bSbillm uint64_t off = uio->uio_loffset; 936feb08c6bSbillm 937feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 938feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 939feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 940feb08c6bSbillm if (error) { 941feb08c6bSbillm dmu_tx_abort(tx); 942feb08c6bSbillm break; 943feb08c6bSbillm } 944feb08c6bSbillm error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); 945feb08c6bSbillm if (error == 0) 946feb08c6bSbillm zvol_log_write(zv, tx, off, bytes); 947feb08c6bSbillm dmu_tx_commit(tx); 948feb08c6bSbillm 949feb08c6bSbillm if (error) 950feb08c6bSbillm break; 951feb08c6bSbillm } 952*c2e6a7d6Sperrin zfs_range_unlock(rl); 953feb08c6bSbillm return (error); 954fa9e4066Sahrens } 955fa9e4066Sahrens 956fa9e4066Sahrens /* 957fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 958fa9e4066Sahrens */ 959fa9e4066Sahrens /*ARGSUSED*/ 960fa9e4066Sahrens int 961fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 962fa9e4066Sahrens { 963fa9e4066Sahrens zvol_state_t *zv; 964fa9e4066Sahrens struct dk_cinfo dkc; 965fa9e4066Sahrens struct dk_minfo dkm; 966fa9e4066Sahrens dk_efi_t efi; 967fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 968fa9e4066Sahrens uint32_t crc; 969fa9e4066Sahrens int error = 0; 970fa9e4066Sahrens 971fa9e4066Sahrens mutex_enter(&zvol_state_lock); 972fa9e4066Sahrens 973fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 974fa9e4066Sahrens 975fa9e4066Sahrens if (zv == NULL) { 976fa9e4066Sahrens mutex_exit(&zvol_state_lock); 977fa9e4066Sahrens return (ENXIO); 978fa9e4066Sahrens } 979fa9e4066Sahrens 980fa9e4066Sahrens switch (cmd) { 981fa9e4066Sahrens 982fa9e4066Sahrens case DKIOCINFO: 983fa9e4066Sahrens bzero(&dkc, sizeof (dkc)); 984fa9e4066Sahrens (void) strcpy(dkc.dki_cname, "zvol"); 985fa9e4066Sahrens (void) strcpy(dkc.dki_dname, "zvol"); 986fa9e4066Sahrens dkc.dki_ctype = DKC_UNKNOWN; 9878f8be083Sbonwick dkc.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 988fa9e4066Sahrens mutex_exit(&zvol_state_lock); 989fa9e4066Sahrens if (ddi_copyout(&dkc, (void *)arg, sizeof (dkc), flag)) 990fa9e4066Sahrens error = EFAULT; 991fa9e4066Sahrens return (error); 992fa9e4066Sahrens 993fa9e4066Sahrens case DKIOCGMEDIAINFO: 994fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 995fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 996fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 997fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 998fa9e4066Sahrens mutex_exit(&zvol_state_lock); 999fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1000fa9e4066Sahrens error = EFAULT; 1001fa9e4066Sahrens return (error); 1002fa9e4066Sahrens 1003fa9e4066Sahrens case DKIOCGETEFI: 1004fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 1005fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1006fa9e4066Sahrens return (EFAULT); 1007fa9e4066Sahrens } 100868a5ac4dSmaybee efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 1009fa9e4066Sahrens 101068a5ac4dSmaybee /* 101168a5ac4dSmaybee * Some clients may attempt to request a PMBR for the 101268a5ac4dSmaybee * zvol. Currently this interface will return ENOTTY to 101368a5ac4dSmaybee * such requests. These requests could be supported by 101468a5ac4dSmaybee * adding a check for lba == 0 and consing up an appropriate 101568a5ac4dSmaybee * RMBR. 101668a5ac4dSmaybee */ 101768a5ac4dSmaybee if (efi.dki_lba == 1) { 101868a5ac4dSmaybee efi_gpt_t gpt; 101968a5ac4dSmaybee efi_gpe_t gpe; 102068a5ac4dSmaybee 102168a5ac4dSmaybee bzero(&gpt, sizeof (gpt)); 102268a5ac4dSmaybee bzero(&gpe, sizeof (gpe)); 102368a5ac4dSmaybee 102468a5ac4dSmaybee if (efi.dki_length < sizeof (gpt)) { 102568a5ac4dSmaybee mutex_exit(&zvol_state_lock); 102668a5ac4dSmaybee return (EINVAL); 102768a5ac4dSmaybee } 1028fa9e4066Sahrens 102968a5ac4dSmaybee gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 103068a5ac4dSmaybee gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 103168a5ac4dSmaybee gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 103268a5ac4dSmaybee gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 103368a5ac4dSmaybee gpt.efi_gpt_LastUsableLBA = 103468a5ac4dSmaybee LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 103568a5ac4dSmaybee gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1036523be69cSmaybee gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 103768a5ac4dSmaybee gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 1038fa9e4066Sahrens 103968a5ac4dSmaybee UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 104068a5ac4dSmaybee gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 104168a5ac4dSmaybee gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 104268a5ac4dSmaybee 104368a5ac4dSmaybee CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 104468a5ac4dSmaybee gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1045fa9e4066Sahrens 104668a5ac4dSmaybee CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 104768a5ac4dSmaybee gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1048fa9e4066Sahrens 104968a5ac4dSmaybee mutex_exit(&zvol_state_lock); 105068a5ac4dSmaybee if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag)) 105168a5ac4dSmaybee error = EFAULT; 105268a5ac4dSmaybee } else if (efi.dki_lba == 2) { 105368a5ac4dSmaybee efi_gpe_t gpe; 1054fa9e4066Sahrens 105568a5ac4dSmaybee bzero(&gpe, sizeof (gpe)); 1056fa9e4066Sahrens 105768a5ac4dSmaybee if (efi.dki_length < sizeof (gpe)) { 105868a5ac4dSmaybee mutex_exit(&zvol_state_lock); 105968a5ac4dSmaybee return (EINVAL); 106068a5ac4dSmaybee } 1061fa9e4066Sahrens 106268a5ac4dSmaybee UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 106368a5ac4dSmaybee gpe.efi_gpe_StartingLBA = LE_64(34ULL); 106468a5ac4dSmaybee gpe.efi_gpe_EndingLBA = 106568a5ac4dSmaybee LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 1066fa9e4066Sahrens 106768a5ac4dSmaybee mutex_exit(&zvol_state_lock); 106868a5ac4dSmaybee if (ddi_copyout(&gpe, efi.dki_data, sizeof (gpe), flag)) 106968a5ac4dSmaybee error = EFAULT; 107068a5ac4dSmaybee } else { 107168a5ac4dSmaybee mutex_exit(&zvol_state_lock); 107268a5ac4dSmaybee error = EINVAL; 107368a5ac4dSmaybee } 1074fa9e4066Sahrens return (error); 1075fa9e4066Sahrens 1076feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1077feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1078feb08c6bSbillm break; 1079feb08c6bSbillm 1080b6130eadSmaybee case DKIOCGGEOM: 1081b6130eadSmaybee case DKIOCGVTOC: 1082b6130eadSmaybee /* commands using these (like prtvtoc) expect ENOTSUP */ 1083b6130eadSmaybee error = ENOTSUP; 1084b6130eadSmaybee break; 1085b6130eadSmaybee 1086fa9e4066Sahrens default: 108768a5ac4dSmaybee error = ENOTTY; 1088fa9e4066Sahrens break; 1089fa9e4066Sahrens 1090fa9e4066Sahrens } 1091fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1092fa9e4066Sahrens return (error); 1093fa9e4066Sahrens } 1094fa9e4066Sahrens 1095fa9e4066Sahrens int 1096fa9e4066Sahrens zvol_busy(void) 1097fa9e4066Sahrens { 1098fa9e4066Sahrens return (zvol_minors != 0); 1099fa9e4066Sahrens } 1100fa9e4066Sahrens 1101fa9e4066Sahrens void 1102fa9e4066Sahrens zvol_init(void) 1103fa9e4066Sahrens { 1104fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1105fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1106fa9e4066Sahrens } 1107fa9e4066Sahrens 1108fa9e4066Sahrens void 1109fa9e4066Sahrens zvol_fini(void) 1110fa9e4066Sahrens { 1111fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1112fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1113fa9e4066Sahrens } 1114