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> 71c2e6a7d6Sperrin #include <sys/zfs_znode.h> 72c2e6a7d6Sperrin #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 */ 106c2e6a7d6Sperrin 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 11791ebeef5Sahrens zvol_size_changed(zvol_state_t *zv, major_t maj) 118fa9e4066Sahrens { 11991ebeef5Sahrens dev_t dev = makedevice(maj, 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 222ecd6cf80Smarks /* ARGSUSED */ 223fa9e4066Sahrens void 224ecd6cf80Smarks zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx) 225fa9e4066Sahrens { 226*da6c28aaSamw zfs_creat_t *zct = arg; 227*da6c28aaSamw nvlist_t *nvprops = zct->zct_props; 228fa9e4066Sahrens int error; 229e9dbad6fSeschrock uint64_t volblocksize, volsize; 230fa9e4066Sahrens 231ecd6cf80Smarks VERIFY(nvlist_lookup_uint64(nvprops, 232e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); 233ecd6cf80Smarks if (nvlist_lookup_uint64(nvprops, 234e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) 235e9dbad6fSeschrock volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); 236e9dbad6fSeschrock 237e9dbad6fSeschrock /* 238e9dbad6fSeschrock * These properites must be removed from the list so the generic 239e9dbad6fSeschrock * property setting step won't apply to them. 240e9dbad6fSeschrock */ 241ecd6cf80Smarks VERIFY(nvlist_remove_all(nvprops, 242e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); 243ecd6cf80Smarks (void) nvlist_remove_all(nvprops, 244e9dbad6fSeschrock zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); 245e9dbad6fSeschrock 246e9dbad6fSeschrock error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, 247fa9e4066Sahrens DMU_OT_NONE, 0, tx); 248fa9e4066Sahrens ASSERT(error == 0); 249fa9e4066Sahrens 250fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 251fa9e4066Sahrens DMU_OT_NONE, 0, tx); 252fa9e4066Sahrens ASSERT(error == 0); 253fa9e4066Sahrens 254e9dbad6fSeschrock error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); 255fa9e4066Sahrens ASSERT(error == 0); 256fa9e4066Sahrens } 257fa9e4066Sahrens 25822ac5be4Sperrin /* 25922ac5be4Sperrin * Replay a TX_WRITE ZIL transaction that didn't get committed 26022ac5be4Sperrin * after a system failure 26122ac5be4Sperrin */ 26222ac5be4Sperrin static int 26322ac5be4Sperrin zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) 26422ac5be4Sperrin { 26522ac5be4Sperrin objset_t *os = zv->zv_objset; 26622ac5be4Sperrin char *data = (char *)(lr + 1); /* data follows lr_write_t */ 26722ac5be4Sperrin uint64_t off = lr->lr_offset; 26822ac5be4Sperrin uint64_t len = lr->lr_length; 26922ac5be4Sperrin dmu_tx_t *tx; 27022ac5be4Sperrin int error; 27122ac5be4Sperrin 27222ac5be4Sperrin if (byteswap) 27322ac5be4Sperrin byteswap_uint64_array(lr, sizeof (*lr)); 27422ac5be4Sperrin 27522ac5be4Sperrin tx = dmu_tx_create(os); 27622ac5be4Sperrin dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); 27722ac5be4Sperrin error = dmu_tx_assign(tx, zv->zv_txg_assign); 27822ac5be4Sperrin if (error) { 27922ac5be4Sperrin dmu_tx_abort(tx); 28022ac5be4Sperrin } else { 28122ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, len, data, tx); 28222ac5be4Sperrin dmu_tx_commit(tx); 28322ac5be4Sperrin } 28422ac5be4Sperrin 28522ac5be4Sperrin return (error); 28622ac5be4Sperrin } 28722ac5be4Sperrin 28822ac5be4Sperrin /* ARGSUSED */ 28922ac5be4Sperrin static int 29022ac5be4Sperrin zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) 29122ac5be4Sperrin { 29222ac5be4Sperrin return (ENOTSUP); 29322ac5be4Sperrin } 29422ac5be4Sperrin 29522ac5be4Sperrin /* 29622ac5be4Sperrin * Callback vectors for replaying records. 29722ac5be4Sperrin * Only TX_WRITE is needed for zvol. 29822ac5be4Sperrin */ 29922ac5be4Sperrin zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { 30022ac5be4Sperrin zvol_replay_err, /* 0 no such transaction type */ 30122ac5be4Sperrin zvol_replay_err, /* TX_CREATE */ 30222ac5be4Sperrin zvol_replay_err, /* TX_MKDIR */ 30322ac5be4Sperrin zvol_replay_err, /* TX_MKXATTR */ 30422ac5be4Sperrin zvol_replay_err, /* TX_SYMLINK */ 30522ac5be4Sperrin zvol_replay_err, /* TX_REMOVE */ 30622ac5be4Sperrin zvol_replay_err, /* TX_RMDIR */ 30722ac5be4Sperrin zvol_replay_err, /* TX_LINK */ 30822ac5be4Sperrin zvol_replay_err, /* TX_RENAME */ 30922ac5be4Sperrin zvol_replay_write, /* TX_WRITE */ 31022ac5be4Sperrin zvol_replay_err, /* TX_TRUNCATE */ 31122ac5be4Sperrin zvol_replay_err, /* TX_SETATTR */ 31222ac5be4Sperrin zvol_replay_err, /* TX_ACL */ 31322ac5be4Sperrin }; 31422ac5be4Sperrin 315fa9e4066Sahrens /* 316fa9e4066Sahrens * Create a minor node for the specified volume. 317fa9e4066Sahrens */ 318fa9e4066Sahrens int 31991ebeef5Sahrens zvol_create_minor(const char *name, major_t maj) 320fa9e4066Sahrens { 321fa9e4066Sahrens zvol_state_t *zv; 322fa9e4066Sahrens objset_t *os; 32367bd71c6Sperrin dmu_object_info_t doi; 324fa9e4066Sahrens uint64_t volsize; 325fa9e4066Sahrens minor_t minor = 0; 326fa9e4066Sahrens struct pathname linkpath; 327fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 328fa9e4066Sahrens vnode_t *vp = NULL; 329fa9e4066Sahrens char *devpath; 330fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 331fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 332fa9e4066Sahrens int error; 333fa9e4066Sahrens 334fa9e4066Sahrens mutex_enter(&zvol_state_lock); 335fa9e4066Sahrens 336fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 337fa9e4066Sahrens mutex_exit(&zvol_state_lock); 338fa9e4066Sahrens return (EEXIST); 339fa9e4066Sahrens } 340fa9e4066Sahrens 341fa9e4066Sahrens if (strchr(name, '@') != 0) 342fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 343fa9e4066Sahrens 344fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 345fa9e4066Sahrens 346fa9e4066Sahrens if (error) { 347fa9e4066Sahrens mutex_exit(&zvol_state_lock); 348fa9e4066Sahrens return (error); 349fa9e4066Sahrens } 350fa9e4066Sahrens 351fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 352fa9e4066Sahrens 353fa9e4066Sahrens if (error) { 354fa9e4066Sahrens dmu_objset_close(os); 355fa9e4066Sahrens mutex_exit(&zvol_state_lock); 356fa9e4066Sahrens return (error); 357fa9e4066Sahrens } 358fa9e4066Sahrens 359fa9e4066Sahrens /* 360fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 361fa9e4066Sahrens * same minor number we used last time. 362fa9e4066Sahrens */ 363fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 364fa9e4066Sahrens 365fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 366fa9e4066Sahrens 367fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 368fa9e4066Sahrens 369fa9e4066Sahrens kmem_free(devpath, devpathlen); 370fa9e4066Sahrens 371fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 372fa9e4066Sahrens error = EINVAL; 373fa9e4066Sahrens 374fa9e4066Sahrens if (error == 0) { 375fa9e4066Sahrens pn_alloc(&linkpath); 376fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 377fa9e4066Sahrens if (error == 0) { 378fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 379fa9e4066Sahrens if (ms != NULL) { 380fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 381fa9e4066Sahrens minor = stoi(&ms); 382fa9e4066Sahrens } 383fa9e4066Sahrens } 384fa9e4066Sahrens pn_free(&linkpath); 385fa9e4066Sahrens } 386fa9e4066Sahrens 387fa9e4066Sahrens if (vp != NULL) 388fa9e4066Sahrens VN_RELE(vp); 389fa9e4066Sahrens 390fa9e4066Sahrens /* 391fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 392fa9e4066Sahrens */ 393fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 394fa9e4066Sahrens minor = 0; 395fa9e4066Sahrens 396fa9e4066Sahrens if (minor == 0) 397fa9e4066Sahrens minor = zvol_minor_alloc(); 398fa9e4066Sahrens 399fa9e4066Sahrens if (minor == 0) { 400fa9e4066Sahrens dmu_objset_close(os); 401fa9e4066Sahrens mutex_exit(&zvol_state_lock); 402fa9e4066Sahrens return (ENXIO); 403fa9e4066Sahrens } 404fa9e4066Sahrens 405fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 406fa9e4066Sahrens dmu_objset_close(os); 407fa9e4066Sahrens mutex_exit(&zvol_state_lock); 408fa9e4066Sahrens return (EAGAIN); 409fa9e4066Sahrens } 410fa9e4066Sahrens 411e9dbad6fSeschrock (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, 412e9dbad6fSeschrock (char *)name); 413fa9e4066Sahrens 414fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 415fa9e4066Sahrens 416fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 417fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 418fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 419fa9e4066Sahrens dmu_objset_close(os); 420fa9e4066Sahrens mutex_exit(&zvol_state_lock); 421fa9e4066Sahrens return (EAGAIN); 422fa9e4066Sahrens } 423fa9e4066Sahrens 424fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 425fa9e4066Sahrens 426fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 427fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 428fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 429fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 430fa9e4066Sahrens dmu_objset_close(os); 431fa9e4066Sahrens mutex_exit(&zvol_state_lock); 432fa9e4066Sahrens return (EAGAIN); 433fa9e4066Sahrens } 434fa9e4066Sahrens 435fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 436fa9e4066Sahrens 437fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 438fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 439fa9e4066Sahrens zv->zv_minor = minor; 440fa9e4066Sahrens zv->zv_volsize = volsize; 441fa9e4066Sahrens zv->zv_objset = os; 442fa9e4066Sahrens zv->zv_mode = ds_mode; 44367bd71c6Sperrin zv->zv_zilog = zil_open(os, zvol_get_data); 444c2e6a7d6Sperrin mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); 445c2e6a7d6Sperrin avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, 446c2e6a7d6Sperrin sizeof (rl_t), offsetof(rl_t, r_node)); 447c2e6a7d6Sperrin 44867bd71c6Sperrin 44967bd71c6Sperrin /* get and cache the blocksize */ 45067bd71c6Sperrin error = dmu_object_info(os, ZVOL_OBJ, &doi); 45167bd71c6Sperrin ASSERT(error == 0); 45267bd71c6Sperrin zv->zv_volblocksize = doi.doi_data_block_size; 45322ac5be4Sperrin 454893a6d32Sahrens zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector); 455fa9e4066Sahrens 45691ebeef5Sahrens zvol_size_changed(zv, maj); 457fa9e4066Sahrens 458ea8dc4b6Seschrock /* XXX this should handle the possible i/o error */ 459fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 460fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 461fa9e4066Sahrens 462fa9e4066Sahrens zvol_minors++; 463fa9e4066Sahrens 464fa9e4066Sahrens mutex_exit(&zvol_state_lock); 465fa9e4066Sahrens 466fa9e4066Sahrens return (0); 467fa9e4066Sahrens } 468fa9e4066Sahrens 469fa9e4066Sahrens /* 470fa9e4066Sahrens * Remove minor node for the specified volume. 471fa9e4066Sahrens */ 472fa9e4066Sahrens int 473e9dbad6fSeschrock zvol_remove_minor(const char *name) 474fa9e4066Sahrens { 475fa9e4066Sahrens zvol_state_t *zv; 476fa9e4066Sahrens char namebuf[30]; 477fa9e4066Sahrens 478fa9e4066Sahrens mutex_enter(&zvol_state_lock); 479fa9e4066Sahrens 480e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 481fa9e4066Sahrens mutex_exit(&zvol_state_lock); 482fa9e4066Sahrens return (ENXIO); 483fa9e4066Sahrens } 484fa9e4066Sahrens 485fa9e4066Sahrens if (zv->zv_total_opens != 0) { 486fa9e4066Sahrens mutex_exit(&zvol_state_lock); 487fa9e4066Sahrens return (EBUSY); 488fa9e4066Sahrens } 489fa9e4066Sahrens 490fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 491fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 492fa9e4066Sahrens 493fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 494fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 495fa9e4066Sahrens 496fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 497fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 498fa9e4066Sahrens 49922ac5be4Sperrin zil_close(zv->zv_zilog); 50022ac5be4Sperrin zv->zv_zilog = NULL; 501fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 502fa9e4066Sahrens zv->zv_objset = NULL; 503c2e6a7d6Sperrin avl_destroy(&zv->zv_znode.z_range_avl); 504c2e6a7d6Sperrin mutex_destroy(&zv->zv_znode.z_range_lock); 505fa9e4066Sahrens 506fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 507fa9e4066Sahrens 508fa9e4066Sahrens zvol_minors--; 509fa9e4066Sahrens 510fa9e4066Sahrens mutex_exit(&zvol_state_lock); 511fa9e4066Sahrens 512fa9e4066Sahrens return (0); 513fa9e4066Sahrens } 514fa9e4066Sahrens 515fa9e4066Sahrens int 51691ebeef5Sahrens zvol_set_volsize(const char *name, major_t maj, uint64_t volsize) 517fa9e4066Sahrens { 518fa9e4066Sahrens zvol_state_t *zv; 519fa9e4066Sahrens dmu_tx_t *tx; 520fa9e4066Sahrens int error; 5215c5460e9Seschrock dmu_object_info_t doi; 522fa9e4066Sahrens 523fa9e4066Sahrens mutex_enter(&zvol_state_lock); 524fa9e4066Sahrens 525e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 526fa9e4066Sahrens mutex_exit(&zvol_state_lock); 527fa9e4066Sahrens return (ENXIO); 528fa9e4066Sahrens } 529fa9e4066Sahrens 5305c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 531e9dbad6fSeschrock (error = zvol_check_volsize(volsize, 532e9dbad6fSeschrock doi.doi_data_block_size)) != 0) { 5335c5460e9Seschrock mutex_exit(&zvol_state_lock); 5345c5460e9Seschrock return (error); 5355c5460e9Seschrock } 5365c5460e9Seschrock 537fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 538fa9e4066Sahrens mutex_exit(&zvol_state_lock); 539fa9e4066Sahrens return (EROFS); 540fa9e4066Sahrens } 541fa9e4066Sahrens 542fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 543ea8dc4b6Seschrock dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); 544e9dbad6fSeschrock dmu_tx_hold_free(tx, ZVOL_OBJ, volsize, DMU_OBJECT_END); 545fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 546fa9e4066Sahrens if (error) { 547fa9e4066Sahrens dmu_tx_abort(tx); 548fa9e4066Sahrens mutex_exit(&zvol_state_lock); 549fa9e4066Sahrens return (error); 550fa9e4066Sahrens } 551fa9e4066Sahrens 552fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 553e9dbad6fSeschrock &volsize, tx); 554ea8dc4b6Seschrock if (error == 0) { 555e9dbad6fSeschrock error = dmu_free_range(zv->zv_objset, ZVOL_OBJ, volsize, 556fa9e4066Sahrens DMU_OBJECT_END, tx); 557ea8dc4b6Seschrock } 558fa9e4066Sahrens 559fa9e4066Sahrens dmu_tx_commit(tx); 560fa9e4066Sahrens 561fa9e4066Sahrens if (error == 0) { 562e9dbad6fSeschrock zv->zv_volsize = volsize; 56391ebeef5Sahrens zvol_size_changed(zv, maj); 564fa9e4066Sahrens } 565fa9e4066Sahrens 566fa9e4066Sahrens mutex_exit(&zvol_state_lock); 567fa9e4066Sahrens 568fa9e4066Sahrens return (error); 569fa9e4066Sahrens } 570fa9e4066Sahrens 571fa9e4066Sahrens int 572e9dbad6fSeschrock zvol_set_volblocksize(const char *name, uint64_t volblocksize) 573fa9e4066Sahrens { 574fa9e4066Sahrens zvol_state_t *zv; 575fa9e4066Sahrens dmu_tx_t *tx; 576fa9e4066Sahrens int error; 577fa9e4066Sahrens 578fa9e4066Sahrens mutex_enter(&zvol_state_lock); 579fa9e4066Sahrens 580e9dbad6fSeschrock if ((zv = zvol_minor_lookup(name)) == NULL) { 581fa9e4066Sahrens mutex_exit(&zvol_state_lock); 582fa9e4066Sahrens return (ENXIO); 583fa9e4066Sahrens } 584fa9e4066Sahrens 585fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 586fa9e4066Sahrens mutex_exit(&zvol_state_lock); 587fa9e4066Sahrens return (EROFS); 588fa9e4066Sahrens } 589fa9e4066Sahrens 590fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 591fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 592fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 593fa9e4066Sahrens if (error) { 594fa9e4066Sahrens dmu_tx_abort(tx); 595fa9e4066Sahrens } else { 596fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 597e9dbad6fSeschrock volblocksize, 0, tx); 598fa9e4066Sahrens if (error == ENOTSUP) 599fa9e4066Sahrens error = EBUSY; 600fa9e4066Sahrens dmu_tx_commit(tx); 601fa9e4066Sahrens } 602fa9e4066Sahrens 603fa9e4066Sahrens mutex_exit(&zvol_state_lock); 604fa9e4066Sahrens 605fa9e4066Sahrens return (error); 606fa9e4066Sahrens } 607fa9e4066Sahrens 608fa9e4066Sahrens /*ARGSUSED*/ 609fa9e4066Sahrens int 610fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 611fa9e4066Sahrens { 612fa9e4066Sahrens minor_t minor = getminor(*devp); 613fa9e4066Sahrens zvol_state_t *zv; 614fa9e4066Sahrens 615fa9e4066Sahrens if (minor == 0) /* This is the control device */ 616fa9e4066Sahrens return (0); 617fa9e4066Sahrens 618fa9e4066Sahrens mutex_enter(&zvol_state_lock); 619fa9e4066Sahrens 620fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 621fa9e4066Sahrens if (zv == NULL) { 622fa9e4066Sahrens mutex_exit(&zvol_state_lock); 623fa9e4066Sahrens return (ENXIO); 624fa9e4066Sahrens } 625fa9e4066Sahrens 626fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 627fa9e4066Sahrens 628fa9e4066Sahrens if ((flag & FWRITE) && 629fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 630fa9e4066Sahrens mutex_exit(&zvol_state_lock); 631fa9e4066Sahrens return (EROFS); 632fa9e4066Sahrens } 633fa9e4066Sahrens 634fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 635fa9e4066Sahrens zv->zv_open_count[otyp]++; 636fa9e4066Sahrens zv->zv_total_opens++; 637fa9e4066Sahrens } 638fa9e4066Sahrens 639fa9e4066Sahrens mutex_exit(&zvol_state_lock); 640fa9e4066Sahrens 641fa9e4066Sahrens return (0); 642fa9e4066Sahrens } 643fa9e4066Sahrens 644fa9e4066Sahrens /*ARGSUSED*/ 645fa9e4066Sahrens int 646fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 647fa9e4066Sahrens { 648fa9e4066Sahrens minor_t minor = getminor(dev); 649fa9e4066Sahrens zvol_state_t *zv; 650fa9e4066Sahrens 651fa9e4066Sahrens if (minor == 0) /* This is the control device */ 652fa9e4066Sahrens return (0); 653fa9e4066Sahrens 654fa9e4066Sahrens mutex_enter(&zvol_state_lock); 655fa9e4066Sahrens 656fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 657fa9e4066Sahrens if (zv == NULL) { 658fa9e4066Sahrens mutex_exit(&zvol_state_lock); 659fa9e4066Sahrens return (ENXIO); 660fa9e4066Sahrens } 661fa9e4066Sahrens 662fa9e4066Sahrens /* 663fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 664fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 665fa9e4066Sahrens */ 666fa9e4066Sahrens if (zv->zv_total_opens == 0) { 667fa9e4066Sahrens mutex_exit(&zvol_state_lock); 668fa9e4066Sahrens return (0); 669fa9e4066Sahrens } 670fa9e4066Sahrens 671fa9e4066Sahrens /* 672fa9e4066Sahrens * If the open count is zero, this is a spurious close. 673fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 674fa9e4066Sahrens */ 675fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 676fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 677fa9e4066Sahrens 678fa9e4066Sahrens /* 679fa9e4066Sahrens * You may get multiple opens, but only one close. 680fa9e4066Sahrens */ 681fa9e4066Sahrens zv->zv_open_count[otyp]--; 682fa9e4066Sahrens zv->zv_total_opens--; 683fa9e4066Sahrens 684fa9e4066Sahrens mutex_exit(&zvol_state_lock); 685fa9e4066Sahrens 686fa9e4066Sahrens return (0); 687fa9e4066Sahrens } 688fa9e4066Sahrens 689feb08c6bSbillm static void 69067bd71c6Sperrin zvol_get_done(dmu_buf_t *db, void *vzgd) 69167bd71c6Sperrin { 69267bd71c6Sperrin zgd_t *zgd = (zgd_t *)vzgd; 693c2e6a7d6Sperrin rl_t *rl = zgd->zgd_rl; 69467bd71c6Sperrin 69567bd71c6Sperrin dmu_buf_rele(db, vzgd); 696c2e6a7d6Sperrin zfs_range_unlock(rl); 69767bd71c6Sperrin zil_add_vdev(zgd->zgd_zilog, DVA_GET_VDEV(BP_IDENTITY(zgd->zgd_bp))); 69867bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 69967bd71c6Sperrin } 70067bd71c6Sperrin 70167bd71c6Sperrin /* 70267bd71c6Sperrin * Get data to generate a TX_WRITE intent log record. 70367bd71c6Sperrin */ 704feb08c6bSbillm static int 70567bd71c6Sperrin zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) 70667bd71c6Sperrin { 70767bd71c6Sperrin zvol_state_t *zv = arg; 70867bd71c6Sperrin objset_t *os = zv->zv_objset; 70967bd71c6Sperrin dmu_buf_t *db; 710c2e6a7d6Sperrin rl_t *rl; 71167bd71c6Sperrin zgd_t *zgd; 712c2e6a7d6Sperrin uint64_t boff; /* block starting offset */ 713c2e6a7d6Sperrin int dlen = lr->lr_length; /* length of user data */ 71467bd71c6Sperrin int error; 71567bd71c6Sperrin 71667bd71c6Sperrin ASSERT(zio); 717c2e6a7d6Sperrin ASSERT(dlen != 0); 718feb08c6bSbillm 719c2e6a7d6Sperrin /* 720c2e6a7d6Sperrin * Write records come in two flavors: immediate and indirect. 721c2e6a7d6Sperrin * For small writes it's cheaper to store the data with the 722c2e6a7d6Sperrin * log record (immediate); for large writes it's cheaper to 723c2e6a7d6Sperrin * sync the data and get a pointer to it (indirect) so that 724c2e6a7d6Sperrin * we don't have to write the data twice. 725c2e6a7d6Sperrin */ 726c2e6a7d6Sperrin if (buf != NULL) /* immediate write */ 727c2e6a7d6Sperrin return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf)); 72867bd71c6Sperrin 72967bd71c6Sperrin zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); 73067bd71c6Sperrin zgd->zgd_zilog = zv->zv_zilog; 73167bd71c6Sperrin zgd->zgd_bp = &lr->lr_blkptr; 73267bd71c6Sperrin 73367bd71c6Sperrin /* 734c2e6a7d6Sperrin * Lock the range of the block to ensure that when the data is 735c2e6a7d6Sperrin * written out and it's checksum is being calculated that no other 736c2e6a7d6Sperrin * thread can change the block. 73767bd71c6Sperrin */ 738c2e6a7d6Sperrin boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t); 739c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize, 740c2e6a7d6Sperrin RL_READER); 741c2e6a7d6Sperrin zgd->zgd_rl = rl; 742c2e6a7d6Sperrin 743c2e6a7d6Sperrin VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); 74467bd71c6Sperrin error = dmu_sync(zio, db, &lr->lr_blkptr, 74567bd71c6Sperrin lr->lr_common.lrc_txg, zvol_get_done, zgd); 746feb08c6bSbillm if (error == 0) 74767bd71c6Sperrin zil_add_vdev(zv->zv_zilog, 74867bd71c6Sperrin DVA_GET_VDEV(BP_IDENTITY(&lr->lr_blkptr))); 74967bd71c6Sperrin /* 75067bd71c6Sperrin * If we get EINPROGRESS, then we need to wait for a 75167bd71c6Sperrin * write IO initiated by dmu_sync() to complete before 75267bd71c6Sperrin * we can release this dbuf. We will finish everything 75367bd71c6Sperrin * up in the zvol_get_done() callback. 75467bd71c6Sperrin */ 75567bd71c6Sperrin if (error == EINPROGRESS) 75667bd71c6Sperrin return (0); 75767bd71c6Sperrin dmu_buf_rele(db, zgd); 758c2e6a7d6Sperrin zfs_range_unlock(rl); 75967bd71c6Sperrin kmem_free(zgd, sizeof (zgd_t)); 76067bd71c6Sperrin return (error); 76167bd71c6Sperrin } 76267bd71c6Sperrin 763a24e15ceSperrin /* 764a24e15ceSperrin * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. 76522ac5be4Sperrin * 76622ac5be4Sperrin * We store data in the log buffers if it's small enough. 76767bd71c6Sperrin * Otherwise we will later flush the data out via dmu_sync(). 76822ac5be4Sperrin */ 76967bd71c6Sperrin ssize_t zvol_immediate_write_sz = 32768; 77022ac5be4Sperrin 771feb08c6bSbillm static void 772feb08c6bSbillm zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len) 77322ac5be4Sperrin { 774feb08c6bSbillm uint32_t blocksize = zv->zv_volblocksize; 77522ac5be4Sperrin lr_write_t *lr; 77622ac5be4Sperrin 777a24e15ceSperrin while (len) { 778feb08c6bSbillm ssize_t nbytes = MIN(len, blocksize - P2PHASE(off, blocksize)); 779feb08c6bSbillm itx_t *itx = zil_itx_create(TX_WRITE, sizeof (*lr)); 780feb08c6bSbillm 781feb08c6bSbillm itx->itx_wr_state = 782feb08c6bSbillm len > zvol_immediate_write_sz ? WR_INDIRECT : WR_NEED_COPY; 783feb08c6bSbillm itx->itx_private = zv; 784feb08c6bSbillm lr = (lr_write_t *)&itx->itx_lr; 785feb08c6bSbillm lr->lr_foid = ZVOL_OBJ; 786feb08c6bSbillm lr->lr_offset = off; 787feb08c6bSbillm lr->lr_length = nbytes; 788feb08c6bSbillm lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t); 789feb08c6bSbillm BP_ZERO(&lr->lr_blkptr); 790feb08c6bSbillm 791feb08c6bSbillm (void) zil_itx_assign(zv->zv_zilog, itx, tx); 792a24e15ceSperrin len -= nbytes; 793a24e15ceSperrin off += nbytes; 79422ac5be4Sperrin } 79522ac5be4Sperrin } 79622ac5be4Sperrin 797fa9e4066Sahrens int 798fa9e4066Sahrens zvol_strategy(buf_t *bp) 799fa9e4066Sahrens { 800fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 801fa9e4066Sahrens uint64_t off, volsize; 802fa9e4066Sahrens size_t size, resid; 803fa9e4066Sahrens char *addr; 80422ac5be4Sperrin objset_t *os; 805c2e6a7d6Sperrin rl_t *rl; 806fa9e4066Sahrens int error = 0; 807c2e6a7d6Sperrin boolean_t reading; 808fa9e4066Sahrens 809fa9e4066Sahrens if (zv == NULL) { 810fa9e4066Sahrens bioerror(bp, ENXIO); 811fa9e4066Sahrens biodone(bp); 812fa9e4066Sahrens return (0); 813fa9e4066Sahrens } 814fa9e4066Sahrens 815fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 816fa9e4066Sahrens bioerror(bp, EINVAL); 817fa9e4066Sahrens biodone(bp); 818fa9e4066Sahrens return (0); 819fa9e4066Sahrens } 820fa9e4066Sahrens 821a2eea2e1Sahrens if ((zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) && 822a2eea2e1Sahrens !(bp->b_flags & B_READ)) { 823fa9e4066Sahrens bioerror(bp, EROFS); 824fa9e4066Sahrens biodone(bp); 825fa9e4066Sahrens return (0); 826fa9e4066Sahrens } 827fa9e4066Sahrens 828fa9e4066Sahrens off = ldbtob(bp->b_blkno); 829fa9e4066Sahrens volsize = zv->zv_volsize; 830fa9e4066Sahrens 83122ac5be4Sperrin os = zv->zv_objset; 83222ac5be4Sperrin ASSERT(os != NULL); 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 */ 842a24e15ceSperrin reading = bp->b_flags & B_READ; 843c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, off, resid, 844c2e6a7d6Sperrin reading ? RL_READER : RL_WRITER); 845a24e15ceSperrin 846fa9e4066Sahrens while (resid != 0 && off < volsize) { 847fa9e4066Sahrens 84867bd71c6Sperrin size = MIN(resid, zvol_maxphys); /* zvol_maxphys per tx */ 849fa9e4066Sahrens 850fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 851fa9e4066Sahrens size = volsize - off; 852fa9e4066Sahrens 853a24e15ceSperrin if (reading) { 854a24e15ceSperrin error = dmu_read(os, ZVOL_OBJ, off, size, addr); 855fa9e4066Sahrens } else { 85622ac5be4Sperrin dmu_tx_t *tx = dmu_tx_create(os); 857fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 858fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 859fa9e4066Sahrens if (error) { 860fa9e4066Sahrens dmu_tx_abort(tx); 861fa9e4066Sahrens } else { 86222ac5be4Sperrin dmu_write(os, ZVOL_OBJ, off, size, addr, tx); 863feb08c6bSbillm zvol_log_write(zv, tx, off, size); 864fa9e4066Sahrens dmu_tx_commit(tx); 865fa9e4066Sahrens } 866fa9e4066Sahrens } 867fa9e4066Sahrens if (error) 868fa9e4066Sahrens break; 869fa9e4066Sahrens off += size; 870fa9e4066Sahrens addr += size; 871fa9e4066Sahrens resid -= size; 872fa9e4066Sahrens } 873c2e6a7d6Sperrin zfs_range_unlock(rl); 874fa9e4066Sahrens 875fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 876fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 877fa9e4066Sahrens 878a6c67037Sperrin if (!(bp->b_flags & B_ASYNC) && !reading && !zil_disable) 879feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 880feb08c6bSbillm 881feb08c6bSbillm biodone(bp); 88222ac5be4Sperrin 883fa9e4066Sahrens return (0); 884fa9e4066Sahrens } 885fa9e4066Sahrens 88667bd71c6Sperrin /* 88767bd71c6Sperrin * Set the buffer count to the zvol maximum transfer. 88867bd71c6Sperrin * Using our own routine instead of the default minphys() 88967bd71c6Sperrin * means that for larger writes we write bigger buffers on X86 89067bd71c6Sperrin * (128K instead of 56K) and flush the disk write cache less often 89167bd71c6Sperrin * (every zvol_maxphys - currently 1MB) instead of minphys (currently 89267bd71c6Sperrin * 56K on X86 and 128K on sparc). 89367bd71c6Sperrin */ 89467bd71c6Sperrin void 89567bd71c6Sperrin zvol_minphys(struct buf *bp) 89667bd71c6Sperrin { 89767bd71c6Sperrin if (bp->b_bcount > zvol_maxphys) 89867bd71c6Sperrin bp->b_bcount = zvol_maxphys; 89967bd71c6Sperrin } 90067bd71c6Sperrin 901fa9e4066Sahrens /*ARGSUSED*/ 902fa9e4066Sahrens int 903feb08c6bSbillm zvol_read(dev_t dev, uio_t *uio, cred_t *cr) 904fa9e4066Sahrens { 905c7ca1008Sgw minor_t minor = getminor(dev); 906c7ca1008Sgw zvol_state_t *zv; 907c2e6a7d6Sperrin rl_t *rl; 908feb08c6bSbillm int error = 0; 909fa9e4066Sahrens 910c7ca1008Sgw if (minor == 0) /* This is the control device */ 911c7ca1008Sgw return (ENXIO); 912c7ca1008Sgw 913c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 914c7ca1008Sgw if (zv == NULL) 915c7ca1008Sgw return (ENXIO); 916c7ca1008Sgw 917c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 918c2e6a7d6Sperrin RL_READER); 919feb08c6bSbillm while (uio->uio_resid > 0) { 920feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 921fa9e4066Sahrens 922feb08c6bSbillm error = dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes); 923feb08c6bSbillm if (error) 924feb08c6bSbillm break; 925feb08c6bSbillm } 926c2e6a7d6Sperrin zfs_range_unlock(rl); 927feb08c6bSbillm return (error); 928fa9e4066Sahrens } 929fa9e4066Sahrens 930fa9e4066Sahrens /*ARGSUSED*/ 931fa9e4066Sahrens int 932feb08c6bSbillm zvol_write(dev_t dev, uio_t *uio, cred_t *cr) 933fa9e4066Sahrens { 934c7ca1008Sgw minor_t minor = getminor(dev); 935c7ca1008Sgw zvol_state_t *zv; 936c2e6a7d6Sperrin rl_t *rl; 937feb08c6bSbillm int error = 0; 938feb08c6bSbillm 939c7ca1008Sgw if (minor == 0) /* This is the control device */ 940c7ca1008Sgw return (ENXIO); 941c7ca1008Sgw 942c7ca1008Sgw zv = ddi_get_soft_state(zvol_state, minor); 943c7ca1008Sgw if (zv == NULL) 944c7ca1008Sgw return (ENXIO); 945c7ca1008Sgw 946c2e6a7d6Sperrin rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid, 947c2e6a7d6Sperrin RL_WRITER); 948feb08c6bSbillm while (uio->uio_resid > 0) { 949feb08c6bSbillm uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1); 950feb08c6bSbillm uint64_t off = uio->uio_loffset; 951feb08c6bSbillm 952feb08c6bSbillm dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 953feb08c6bSbillm dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes); 954feb08c6bSbillm error = dmu_tx_assign(tx, TXG_WAIT); 955feb08c6bSbillm if (error) { 956feb08c6bSbillm dmu_tx_abort(tx); 957feb08c6bSbillm break; 958feb08c6bSbillm } 959feb08c6bSbillm error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx); 960feb08c6bSbillm if (error == 0) 961feb08c6bSbillm zvol_log_write(zv, tx, off, bytes); 962feb08c6bSbillm dmu_tx_commit(tx); 963feb08c6bSbillm 964feb08c6bSbillm if (error) 965feb08c6bSbillm break; 966feb08c6bSbillm } 967c2e6a7d6Sperrin zfs_range_unlock(rl); 968feb08c6bSbillm return (error); 969fa9e4066Sahrens } 970fa9e4066Sahrens 971fa9e4066Sahrens /* 972fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 973fa9e4066Sahrens */ 974fa9e4066Sahrens /*ARGSUSED*/ 975fa9e4066Sahrens int 976fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 977fa9e4066Sahrens { 978fa9e4066Sahrens zvol_state_t *zv; 979af2c4821Smaybee struct dk_cinfo dki; 980fa9e4066Sahrens struct dk_minfo dkm; 981fa9e4066Sahrens dk_efi_t efi; 982af2c4821Smaybee struct dk_callback *dkc; 983fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 984fa9e4066Sahrens uint32_t crc; 985fa9e4066Sahrens int error = 0; 986fa9e4066Sahrens 987fa9e4066Sahrens mutex_enter(&zvol_state_lock); 988fa9e4066Sahrens 989fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 990fa9e4066Sahrens 991fa9e4066Sahrens if (zv == NULL) { 992fa9e4066Sahrens mutex_exit(&zvol_state_lock); 993fa9e4066Sahrens return (ENXIO); 994fa9e4066Sahrens } 995fa9e4066Sahrens 996fa9e4066Sahrens switch (cmd) { 997fa9e4066Sahrens 998fa9e4066Sahrens case DKIOCINFO: 999af2c4821Smaybee bzero(&dki, sizeof (dki)); 1000af2c4821Smaybee (void) strcpy(dki.dki_cname, "zvol"); 1001af2c4821Smaybee (void) strcpy(dki.dki_dname, "zvol"); 1002af2c4821Smaybee dki.dki_ctype = DKC_UNKNOWN; 1003af2c4821Smaybee dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs); 1004fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1005af2c4821Smaybee if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag)) 1006fa9e4066Sahrens error = EFAULT; 1007fa9e4066Sahrens return (error); 1008fa9e4066Sahrens 1009fa9e4066Sahrens case DKIOCGMEDIAINFO: 1010fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 1011fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 1012fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 1013fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 1014fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1015fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 1016fa9e4066Sahrens error = EFAULT; 1017fa9e4066Sahrens return (error); 1018fa9e4066Sahrens 1019fa9e4066Sahrens case DKIOCGETEFI: 1020fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 1021fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1022fa9e4066Sahrens return (EFAULT); 1023fa9e4066Sahrens } 102468a5ac4dSmaybee efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 1025fa9e4066Sahrens 102668a5ac4dSmaybee /* 102768a5ac4dSmaybee * Some clients may attempt to request a PMBR for the 102868a5ac4dSmaybee * zvol. Currently this interface will return ENOTTY to 102968a5ac4dSmaybee * such requests. These requests could be supported by 103068a5ac4dSmaybee * adding a check for lba == 0 and consing up an appropriate 103168a5ac4dSmaybee * RMBR. 103268a5ac4dSmaybee */ 103368a5ac4dSmaybee if (efi.dki_lba == 1) { 103468a5ac4dSmaybee efi_gpt_t gpt; 103568a5ac4dSmaybee efi_gpe_t gpe; 103668a5ac4dSmaybee 103768a5ac4dSmaybee bzero(&gpt, sizeof (gpt)); 103868a5ac4dSmaybee bzero(&gpe, sizeof (gpe)); 103968a5ac4dSmaybee 104068a5ac4dSmaybee if (efi.dki_length < sizeof (gpt)) { 104168a5ac4dSmaybee mutex_exit(&zvol_state_lock); 104268a5ac4dSmaybee return (EINVAL); 104368a5ac4dSmaybee } 1044fa9e4066Sahrens 104568a5ac4dSmaybee gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 104668a5ac4dSmaybee gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 104768a5ac4dSmaybee gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 104868a5ac4dSmaybee gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL); 104968a5ac4dSmaybee gpt.efi_gpt_LastUsableLBA = 105068a5ac4dSmaybee LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 105168a5ac4dSmaybee gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 1052523be69cSmaybee gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL); 105368a5ac4dSmaybee gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 1054fa9e4066Sahrens 105568a5ac4dSmaybee UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 105668a5ac4dSmaybee gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 105768a5ac4dSmaybee gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 105868a5ac4dSmaybee 105968a5ac4dSmaybee CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 106068a5ac4dSmaybee gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 1061fa9e4066Sahrens 106268a5ac4dSmaybee CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 106368a5ac4dSmaybee gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 1064fa9e4066Sahrens 106568a5ac4dSmaybee mutex_exit(&zvol_state_lock); 106668a5ac4dSmaybee if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag)) 106768a5ac4dSmaybee error = EFAULT; 106868a5ac4dSmaybee } else if (efi.dki_lba == 2) { 106968a5ac4dSmaybee efi_gpe_t gpe; 1070fa9e4066Sahrens 107168a5ac4dSmaybee bzero(&gpe, sizeof (gpe)); 1072fa9e4066Sahrens 107368a5ac4dSmaybee if (efi.dki_length < sizeof (gpe)) { 107468a5ac4dSmaybee mutex_exit(&zvol_state_lock); 107568a5ac4dSmaybee return (EINVAL); 107668a5ac4dSmaybee } 1077fa9e4066Sahrens 107868a5ac4dSmaybee UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 107968a5ac4dSmaybee gpe.efi_gpe_StartingLBA = LE_64(34ULL); 108068a5ac4dSmaybee gpe.efi_gpe_EndingLBA = 108168a5ac4dSmaybee LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 1082fa9e4066Sahrens 108368a5ac4dSmaybee mutex_exit(&zvol_state_lock); 108468a5ac4dSmaybee if (ddi_copyout(&gpe, efi.dki_data, sizeof (gpe), flag)) 108568a5ac4dSmaybee error = EFAULT; 108668a5ac4dSmaybee } else { 108768a5ac4dSmaybee mutex_exit(&zvol_state_lock); 108868a5ac4dSmaybee error = EINVAL; 108968a5ac4dSmaybee } 1090fa9e4066Sahrens return (error); 1091fa9e4066Sahrens 1092feb08c6bSbillm case DKIOCFLUSHWRITECACHE: 1093af2c4821Smaybee dkc = (struct dk_callback *)arg; 1094feb08c6bSbillm zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); 1095af2c4821Smaybee if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) { 1096af2c4821Smaybee (*dkc->dkc_callback)(dkc->dkc_cookie, error); 1097af2c4821Smaybee error = 0; 1098af2c4821Smaybee } 1099feb08c6bSbillm break; 1100feb08c6bSbillm 1101b6130eadSmaybee case DKIOCGGEOM: 1102b6130eadSmaybee case DKIOCGVTOC: 1103b6130eadSmaybee /* commands using these (like prtvtoc) expect ENOTSUP */ 1104b6130eadSmaybee error = ENOTSUP; 1105b6130eadSmaybee break; 1106b6130eadSmaybee 1107fa9e4066Sahrens default: 110868a5ac4dSmaybee error = ENOTTY; 1109fa9e4066Sahrens break; 1110fa9e4066Sahrens 1111fa9e4066Sahrens } 1112fa9e4066Sahrens mutex_exit(&zvol_state_lock); 1113fa9e4066Sahrens return (error); 1114fa9e4066Sahrens } 1115fa9e4066Sahrens 1116fa9e4066Sahrens int 1117fa9e4066Sahrens zvol_busy(void) 1118fa9e4066Sahrens { 1119fa9e4066Sahrens return (zvol_minors != 0); 1120fa9e4066Sahrens } 1121fa9e4066Sahrens 1122fa9e4066Sahrens void 1123fa9e4066Sahrens zvol_init(void) 1124fa9e4066Sahrens { 1125fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 1126fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 1127fa9e4066Sahrens } 1128fa9e4066Sahrens 1129fa9e4066Sahrens void 1130fa9e4066Sahrens zvol_fini(void) 1131fa9e4066Sahrens { 1132fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 1133fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 1134fa9e4066Sahrens } 1135