1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5fa9e4066Sahrens * Common Development and Distribution License, Version 1.0 only 6fa9e4066Sahrens * (the "License"). You may not use this file except in compliance 7fa9e4066Sahrens * with the License. 8fa9e4066Sahrens * 9fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 11fa9e4066Sahrens * See the License for the specific language governing permissions 12fa9e4066Sahrens * and limitations under the License. 13fa9e4066Sahrens * 14fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 15fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 17fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 18fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 19fa9e4066Sahrens * 20fa9e4066Sahrens * CDDL HEADER END 21fa9e4066Sahrens */ 22fa9e4066Sahrens /* 23fa9e4066Sahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24fa9e4066Sahrens * Use is subject to license terms. 25fa9e4066Sahrens */ 26fa9e4066Sahrens 27fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 28fa9e4066Sahrens 29fa9e4066Sahrens /* 30fa9e4066Sahrens * ZFS volume emulation driver. 31fa9e4066Sahrens * 32fa9e4066Sahrens * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 33fa9e4066Sahrens * Volumes are accessed through the symbolic links named: 34fa9e4066Sahrens * 35fa9e4066Sahrens * /dev/zvol/dsk/<pool_name>/<dataset_name> 36fa9e4066Sahrens * /dev/zvol/rdsk/<pool_name>/<dataset_name> 37fa9e4066Sahrens * 38fa9e4066Sahrens * These links are created by the ZFS-specific devfsadm link generator. 39fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 40fa9e4066Sahrens * run before opening and using a device. 41fa9e4066Sahrens */ 42fa9e4066Sahrens 43fa9e4066Sahrens #include <sys/types.h> 44fa9e4066Sahrens #include <sys/param.h> 45fa9e4066Sahrens #include <sys/errno.h> 46fa9e4066Sahrens #include <sys/aio_req.h> 47fa9e4066Sahrens #include <sys/uio.h> 48fa9e4066Sahrens #include <sys/buf.h> 49fa9e4066Sahrens #include <sys/modctl.h> 50fa9e4066Sahrens #include <sys/open.h> 51fa9e4066Sahrens #include <sys/kmem.h> 52fa9e4066Sahrens #include <sys/conf.h> 53fa9e4066Sahrens #include <sys/cmn_err.h> 54fa9e4066Sahrens #include <sys/stat.h> 55fa9e4066Sahrens #include <sys/zap.h> 56fa9e4066Sahrens #include <sys/spa.h> 57fa9e4066Sahrens #include <sys/zio.h> 58fa9e4066Sahrens #include <sys/dsl_prop.h> 59fa9e4066Sahrens #include <sys/dkio.h> 60fa9e4066Sahrens #include <sys/efi_partition.h> 61fa9e4066Sahrens #include <sys/byteorder.h> 62fa9e4066Sahrens #include <sys/pathname.h> 63fa9e4066Sahrens #include <sys/ddi.h> 64fa9e4066Sahrens #include <sys/sunddi.h> 65fa9e4066Sahrens #include <sys/crc32.h> 66fa9e4066Sahrens #include <sys/dirent.h> 67fa9e4066Sahrens #include <sys/policy.h> 68fa9e4066Sahrens #include <sys/fs/zfs.h> 69fa9e4066Sahrens #include <sys/zfs_ioctl.h> 70fa9e4066Sahrens #include <sys/mkdev.h> 71fa9e4066Sahrens 72fa9e4066Sahrens #include "zfs_namecheck.h" 73fa9e4066Sahrens 74fa9e4066Sahrens #define ZVOL_OBJ 1ULL 75fa9e4066Sahrens #define ZVOL_ZAP_OBJ 2ULL 76fa9e4066Sahrens 77fa9e4066Sahrens static void *zvol_state; 78fa9e4066Sahrens 79fa9e4066Sahrens /* 80fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 81fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 82fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 83fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 84fa9e4066Sahrens */ 85fa9e4066Sahrens static kmutex_t zvol_state_lock; 86fa9e4066Sahrens static uint32_t zvol_minors; 87fa9e4066Sahrens 88fa9e4066Sahrens /* 89fa9e4066Sahrens * The in-core state of each volume. 90fa9e4066Sahrens */ 91fa9e4066Sahrens typedef struct zvol_state { 92fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 93fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 94fa9e4066Sahrens minor_t zv_minor; /* minor number */ 95fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 96fa9e4066Sahrens uint8_t zv_readonly; /* hard readonly; like write-protect */ 97fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 98fa9e4066Sahrens uint32_t zv_mode; /* DS_MODE_* flags at open time */ 99fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 100fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 101fa9e4066Sahrens } zvol_state_t; 102fa9e4066Sahrens 103fa9e4066Sahrens static void 104fa9e4066Sahrens zvol_size_changed(zvol_state_t *zv, dev_t dev) 105fa9e4066Sahrens { 106fa9e4066Sahrens dev = makedevice(getmajor(dev), zv->zv_minor); 107fa9e4066Sahrens 108fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 109fa9e4066Sahrens "Size", zv->zv_volsize) == DDI_SUCCESS); 110fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 111fa9e4066Sahrens "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); 112fa9e4066Sahrens } 113fa9e4066Sahrens 114fa9e4066Sahrens int 115*5c5460e9Seschrock zvol_check_volsize(zfs_cmd_t *zc, uint64_t blocksize) 116fa9e4066Sahrens { 117fa9e4066Sahrens if (zc->zc_volsize == 0) 118fa9e4066Sahrens return (EINVAL); 119fa9e4066Sahrens 120*5c5460e9Seschrock if (zc->zc_volsize % blocksize != 0) 121*5c5460e9Seschrock return (EINVAL); 122*5c5460e9Seschrock 123fa9e4066Sahrens #ifdef _ILP32 124fa9e4066Sahrens if (zc->zc_volsize - 1 > SPEC_MAXOFFSET_T) 125fa9e4066Sahrens return (EOVERFLOW); 126fa9e4066Sahrens #endif 127fa9e4066Sahrens return (0); 128fa9e4066Sahrens } 129fa9e4066Sahrens 130fa9e4066Sahrens int 131fa9e4066Sahrens zvol_check_volblocksize(zfs_cmd_t *zc) 132fa9e4066Sahrens { 133fa9e4066Sahrens if (zc->zc_volblocksize < SPA_MINBLOCKSIZE || 134fa9e4066Sahrens zc->zc_volblocksize > SPA_MAXBLOCKSIZE || 135fa9e4066Sahrens !ISP2(zc->zc_volblocksize)) 136fa9e4066Sahrens return (EDOM); 137fa9e4066Sahrens 138fa9e4066Sahrens return (0); 139fa9e4066Sahrens } 140fa9e4066Sahrens 141fa9e4066Sahrens static void 142fa9e4066Sahrens zvol_readonly_changed_cb(void *arg, uint64_t newval) 143fa9e4066Sahrens { 144fa9e4066Sahrens zvol_state_t *zv = arg; 145fa9e4066Sahrens 146fa9e4066Sahrens zv->zv_readonly = (uint8_t)newval; 147fa9e4066Sahrens } 148fa9e4066Sahrens 149fa9e4066Sahrens int 150fa9e4066Sahrens zvol_get_stats(zfs_cmd_t *zc, objset_t *os) 151fa9e4066Sahrens { 152fa9e4066Sahrens int error; 153fa9e4066Sahrens dmu_object_info_t doi; 154fa9e4066Sahrens 155fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize); 156fa9e4066Sahrens 157fa9e4066Sahrens if (error) 158fa9e4066Sahrens return (error); 159fa9e4066Sahrens 160fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 161fa9e4066Sahrens 162fa9e4066Sahrens if (error == 0) 163fa9e4066Sahrens zc->zc_volblocksize = doi.doi_data_block_size; 164fa9e4066Sahrens 165fa9e4066Sahrens return (error); 166fa9e4066Sahrens } 167fa9e4066Sahrens 168fa9e4066Sahrens /* 169fa9e4066Sahrens * Find a free minor number. 170fa9e4066Sahrens */ 171fa9e4066Sahrens static minor_t 172fa9e4066Sahrens zvol_minor_alloc(void) 173fa9e4066Sahrens { 174fa9e4066Sahrens minor_t minor; 175fa9e4066Sahrens 176fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 177fa9e4066Sahrens 178fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 179fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 180fa9e4066Sahrens return (minor); 181fa9e4066Sahrens 182fa9e4066Sahrens return (0); 183fa9e4066Sahrens } 184fa9e4066Sahrens 185fa9e4066Sahrens static zvol_state_t * 186fa9e4066Sahrens zvol_minor_lookup(char *name) 187fa9e4066Sahrens { 188fa9e4066Sahrens minor_t minor; 189fa9e4066Sahrens zvol_state_t *zv; 190fa9e4066Sahrens 191fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 192fa9e4066Sahrens 193fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 194fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 195fa9e4066Sahrens if (zv == NULL) 196fa9e4066Sahrens continue; 197fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 198fa9e4066Sahrens break; 199fa9e4066Sahrens } 200fa9e4066Sahrens 201fa9e4066Sahrens return (zv); 202fa9e4066Sahrens } 203fa9e4066Sahrens 204fa9e4066Sahrens void 205fa9e4066Sahrens zvol_create_cb(objset_t *os, void *arg, dmu_tx_t *tx) 206fa9e4066Sahrens { 207fa9e4066Sahrens zfs_cmd_t *zc = arg; 208fa9e4066Sahrens int error; 209fa9e4066Sahrens 210fa9e4066Sahrens error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, zc->zc_volblocksize, 211fa9e4066Sahrens DMU_OT_NONE, 0, tx); 212fa9e4066Sahrens ASSERT(error == 0); 213fa9e4066Sahrens 214fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 215fa9e4066Sahrens DMU_OT_NONE, 0, tx); 216fa9e4066Sahrens ASSERT(error == 0); 217fa9e4066Sahrens 218fa9e4066Sahrens error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize, tx); 219fa9e4066Sahrens ASSERT(error == 0); 220fa9e4066Sahrens } 221fa9e4066Sahrens 222fa9e4066Sahrens /* 223fa9e4066Sahrens * Create a minor node for the specified volume. 224fa9e4066Sahrens */ 225fa9e4066Sahrens int 226fa9e4066Sahrens zvol_create_minor(zfs_cmd_t *zc) 227fa9e4066Sahrens { 228fa9e4066Sahrens char *name = zc->zc_name; 229fa9e4066Sahrens dev_t dev = zc->zc_dev; 230fa9e4066Sahrens zvol_state_t *zv; 231fa9e4066Sahrens objset_t *os; 232fa9e4066Sahrens uint64_t volsize; 233fa9e4066Sahrens minor_t minor = 0; 234fa9e4066Sahrens struct pathname linkpath; 235fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 236fa9e4066Sahrens vnode_t *vp = NULL; 237fa9e4066Sahrens char *devpath; 238fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 239fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 240fa9e4066Sahrens int error; 241fa9e4066Sahrens 242fa9e4066Sahrens mutex_enter(&zvol_state_lock); 243fa9e4066Sahrens 244fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 245fa9e4066Sahrens mutex_exit(&zvol_state_lock); 246fa9e4066Sahrens return (EEXIST); 247fa9e4066Sahrens } 248fa9e4066Sahrens 249fa9e4066Sahrens if (strchr(name, '@') != 0) 250fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 251fa9e4066Sahrens 252fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 253fa9e4066Sahrens 254fa9e4066Sahrens if (error) { 255fa9e4066Sahrens mutex_exit(&zvol_state_lock); 256fa9e4066Sahrens return (error); 257fa9e4066Sahrens } 258fa9e4066Sahrens 259fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 260fa9e4066Sahrens 261fa9e4066Sahrens if (error) { 262fa9e4066Sahrens dmu_objset_close(os); 263fa9e4066Sahrens mutex_exit(&zvol_state_lock); 264fa9e4066Sahrens return (error); 265fa9e4066Sahrens } 266fa9e4066Sahrens 267fa9e4066Sahrens /* 268fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 269fa9e4066Sahrens * same minor number we used last time. 270fa9e4066Sahrens */ 271fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 272fa9e4066Sahrens 273fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 274fa9e4066Sahrens 275fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 276fa9e4066Sahrens 277fa9e4066Sahrens kmem_free(devpath, devpathlen); 278fa9e4066Sahrens 279fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 280fa9e4066Sahrens error = EINVAL; 281fa9e4066Sahrens 282fa9e4066Sahrens if (error == 0) { 283fa9e4066Sahrens pn_alloc(&linkpath); 284fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 285fa9e4066Sahrens if (error == 0) { 286fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 287fa9e4066Sahrens if (ms != NULL) { 288fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 289fa9e4066Sahrens minor = stoi(&ms); 290fa9e4066Sahrens } 291fa9e4066Sahrens } 292fa9e4066Sahrens pn_free(&linkpath); 293fa9e4066Sahrens } 294fa9e4066Sahrens 295fa9e4066Sahrens if (vp != NULL) 296fa9e4066Sahrens VN_RELE(vp); 297fa9e4066Sahrens 298fa9e4066Sahrens /* 299fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 300fa9e4066Sahrens */ 301fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 302fa9e4066Sahrens minor = 0; 303fa9e4066Sahrens 304fa9e4066Sahrens if (minor == 0) 305fa9e4066Sahrens minor = zvol_minor_alloc(); 306fa9e4066Sahrens 307fa9e4066Sahrens if (minor == 0) { 308fa9e4066Sahrens dmu_objset_close(os); 309fa9e4066Sahrens mutex_exit(&zvol_state_lock); 310fa9e4066Sahrens return (ENXIO); 311fa9e4066Sahrens } 312fa9e4066Sahrens 313fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 314fa9e4066Sahrens dmu_objset_close(os); 315fa9e4066Sahrens mutex_exit(&zvol_state_lock); 316fa9e4066Sahrens return (EAGAIN); 317fa9e4066Sahrens } 318fa9e4066Sahrens 319fa9e4066Sahrens (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, name); 320fa9e4066Sahrens 321fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 322fa9e4066Sahrens 323fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 324fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 325fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 326fa9e4066Sahrens dmu_objset_close(os); 327fa9e4066Sahrens mutex_exit(&zvol_state_lock); 328fa9e4066Sahrens return (EAGAIN); 329fa9e4066Sahrens } 330fa9e4066Sahrens 331fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 332fa9e4066Sahrens 333fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 334fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 335fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 336fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 337fa9e4066Sahrens dmu_objset_close(os); 338fa9e4066Sahrens mutex_exit(&zvol_state_lock); 339fa9e4066Sahrens return (EAGAIN); 340fa9e4066Sahrens } 341fa9e4066Sahrens 342fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 343fa9e4066Sahrens 344fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 345fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 346fa9e4066Sahrens zv->zv_minor = minor; 347fa9e4066Sahrens zv->zv_volsize = volsize; 348fa9e4066Sahrens zv->zv_objset = os; 349fa9e4066Sahrens zv->zv_mode = ds_mode; 350fa9e4066Sahrens 351fa9e4066Sahrens zvol_size_changed(zv, dev); 352fa9e4066Sahrens 353fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 354fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 355fa9e4066Sahrens 356fa9e4066Sahrens zvol_minors++; 357fa9e4066Sahrens 358fa9e4066Sahrens mutex_exit(&zvol_state_lock); 359fa9e4066Sahrens 360fa9e4066Sahrens return (0); 361fa9e4066Sahrens } 362fa9e4066Sahrens 363fa9e4066Sahrens /* 364fa9e4066Sahrens * Remove minor node for the specified volume. 365fa9e4066Sahrens */ 366fa9e4066Sahrens int 367fa9e4066Sahrens zvol_remove_minor(zfs_cmd_t *zc) 368fa9e4066Sahrens { 369fa9e4066Sahrens zvol_state_t *zv; 370fa9e4066Sahrens char namebuf[30]; 371fa9e4066Sahrens 372fa9e4066Sahrens mutex_enter(&zvol_state_lock); 373fa9e4066Sahrens 374fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 375fa9e4066Sahrens mutex_exit(&zvol_state_lock); 376fa9e4066Sahrens return (ENXIO); 377fa9e4066Sahrens } 378fa9e4066Sahrens 379fa9e4066Sahrens if (zv->zv_total_opens != 0) { 380fa9e4066Sahrens mutex_exit(&zvol_state_lock); 381fa9e4066Sahrens return (EBUSY); 382fa9e4066Sahrens } 383fa9e4066Sahrens 384fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 385fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 386fa9e4066Sahrens 387fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 388fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 389fa9e4066Sahrens 390fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 391fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 392fa9e4066Sahrens 393fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 394fa9e4066Sahrens 395fa9e4066Sahrens zv->zv_objset = NULL; 396fa9e4066Sahrens 397fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 398fa9e4066Sahrens 399fa9e4066Sahrens zvol_minors--; 400fa9e4066Sahrens 401fa9e4066Sahrens mutex_exit(&zvol_state_lock); 402fa9e4066Sahrens 403fa9e4066Sahrens return (0); 404fa9e4066Sahrens } 405fa9e4066Sahrens 406fa9e4066Sahrens int 407fa9e4066Sahrens zvol_set_volsize(zfs_cmd_t *zc) 408fa9e4066Sahrens { 409fa9e4066Sahrens zvol_state_t *zv; 410fa9e4066Sahrens dev_t dev = zc->zc_dev; 411fa9e4066Sahrens dmu_tx_t *tx; 412fa9e4066Sahrens int error; 413*5c5460e9Seschrock dmu_object_info_t doi; 414fa9e4066Sahrens 415fa9e4066Sahrens mutex_enter(&zvol_state_lock); 416fa9e4066Sahrens 417fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 418fa9e4066Sahrens mutex_exit(&zvol_state_lock); 419fa9e4066Sahrens return (ENXIO); 420fa9e4066Sahrens } 421fa9e4066Sahrens 422*5c5460e9Seschrock if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || 423*5c5460e9Seschrock (error = zvol_check_volsize(zc, doi.doi_data_block_size)) != 0) { 424*5c5460e9Seschrock mutex_exit(&zvol_state_lock); 425*5c5460e9Seschrock return (error); 426*5c5460e9Seschrock } 427*5c5460e9Seschrock 428fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 429fa9e4066Sahrens mutex_exit(&zvol_state_lock); 430fa9e4066Sahrens return (EROFS); 431fa9e4066Sahrens } 432fa9e4066Sahrens 433fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 434fa9e4066Sahrens dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, 1); 435fa9e4066Sahrens dmu_tx_hold_free(tx, ZVOL_OBJ, zc->zc_volsize, DMU_OBJECT_END); 436fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 437fa9e4066Sahrens if (error) { 438fa9e4066Sahrens dmu_tx_abort(tx); 439fa9e4066Sahrens mutex_exit(&zvol_state_lock); 440fa9e4066Sahrens return (error); 441fa9e4066Sahrens } 442fa9e4066Sahrens 443fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 444fa9e4066Sahrens &zc->zc_volsize, tx); 445fa9e4066Sahrens if (error == 0) 446fa9e4066Sahrens dmu_free_range(zv->zv_objset, ZVOL_OBJ, zc->zc_volsize, 447fa9e4066Sahrens DMU_OBJECT_END, tx); 448fa9e4066Sahrens 449fa9e4066Sahrens dmu_tx_commit(tx); 450fa9e4066Sahrens 451fa9e4066Sahrens if (error == 0) { 452fa9e4066Sahrens zv->zv_volsize = zc->zc_volsize; 453fa9e4066Sahrens zvol_size_changed(zv, dev); 454fa9e4066Sahrens } 455fa9e4066Sahrens 456fa9e4066Sahrens mutex_exit(&zvol_state_lock); 457fa9e4066Sahrens 458fa9e4066Sahrens return (error); 459fa9e4066Sahrens } 460fa9e4066Sahrens 461fa9e4066Sahrens int 462fa9e4066Sahrens zvol_set_volblocksize(zfs_cmd_t *zc) 463fa9e4066Sahrens { 464fa9e4066Sahrens zvol_state_t *zv; 465fa9e4066Sahrens dmu_tx_t *tx; 466fa9e4066Sahrens int error; 467fa9e4066Sahrens 468fa9e4066Sahrens mutex_enter(&zvol_state_lock); 469fa9e4066Sahrens 470fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 471fa9e4066Sahrens mutex_exit(&zvol_state_lock); 472fa9e4066Sahrens return (ENXIO); 473fa9e4066Sahrens } 474fa9e4066Sahrens 475fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 476fa9e4066Sahrens mutex_exit(&zvol_state_lock); 477fa9e4066Sahrens return (EROFS); 478fa9e4066Sahrens } 479fa9e4066Sahrens 480fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 481fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 482fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 483fa9e4066Sahrens if (error) { 484fa9e4066Sahrens dmu_tx_abort(tx); 485fa9e4066Sahrens } else { 486fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 487fa9e4066Sahrens zc->zc_volblocksize, 0, tx); 488fa9e4066Sahrens if (error == ENOTSUP) 489fa9e4066Sahrens error = EBUSY; 490fa9e4066Sahrens dmu_tx_commit(tx); 491fa9e4066Sahrens } 492fa9e4066Sahrens 493fa9e4066Sahrens mutex_exit(&zvol_state_lock); 494fa9e4066Sahrens 495fa9e4066Sahrens return (error); 496fa9e4066Sahrens } 497fa9e4066Sahrens 498fa9e4066Sahrens /*ARGSUSED*/ 499fa9e4066Sahrens int 500fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 501fa9e4066Sahrens { 502fa9e4066Sahrens minor_t minor = getminor(*devp); 503fa9e4066Sahrens zvol_state_t *zv; 504fa9e4066Sahrens 505fa9e4066Sahrens if (minor == 0) /* This is the control device */ 506fa9e4066Sahrens return (0); 507fa9e4066Sahrens 508fa9e4066Sahrens mutex_enter(&zvol_state_lock); 509fa9e4066Sahrens 510fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 511fa9e4066Sahrens if (zv == NULL) { 512fa9e4066Sahrens mutex_exit(&zvol_state_lock); 513fa9e4066Sahrens return (ENXIO); 514fa9e4066Sahrens } 515fa9e4066Sahrens 516fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 517fa9e4066Sahrens 518fa9e4066Sahrens if ((flag & FWRITE) && 519fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 520fa9e4066Sahrens mutex_exit(&zvol_state_lock); 521fa9e4066Sahrens return (EROFS); 522fa9e4066Sahrens } 523fa9e4066Sahrens 524fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 525fa9e4066Sahrens zv->zv_open_count[otyp]++; 526fa9e4066Sahrens zv->zv_total_opens++; 527fa9e4066Sahrens } 528fa9e4066Sahrens 529fa9e4066Sahrens mutex_exit(&zvol_state_lock); 530fa9e4066Sahrens 531fa9e4066Sahrens return (0); 532fa9e4066Sahrens } 533fa9e4066Sahrens 534fa9e4066Sahrens /*ARGSUSED*/ 535fa9e4066Sahrens int 536fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 537fa9e4066Sahrens { 538fa9e4066Sahrens minor_t minor = getminor(dev); 539fa9e4066Sahrens zvol_state_t *zv; 540fa9e4066Sahrens 541fa9e4066Sahrens if (minor == 0) /* This is the control device */ 542fa9e4066Sahrens return (0); 543fa9e4066Sahrens 544fa9e4066Sahrens mutex_enter(&zvol_state_lock); 545fa9e4066Sahrens 546fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 547fa9e4066Sahrens if (zv == NULL) { 548fa9e4066Sahrens mutex_exit(&zvol_state_lock); 549fa9e4066Sahrens return (ENXIO); 550fa9e4066Sahrens } 551fa9e4066Sahrens 552fa9e4066Sahrens /* 553fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 554fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 555fa9e4066Sahrens */ 556fa9e4066Sahrens if (zv->zv_total_opens == 0) { 557fa9e4066Sahrens mutex_exit(&zvol_state_lock); 558fa9e4066Sahrens return (0); 559fa9e4066Sahrens } 560fa9e4066Sahrens 561fa9e4066Sahrens /* 562fa9e4066Sahrens * If the open count is zero, this is a spurious close. 563fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 564fa9e4066Sahrens */ 565fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 566fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 567fa9e4066Sahrens 568fa9e4066Sahrens /* 569fa9e4066Sahrens * You may get multiple opens, but only one close. 570fa9e4066Sahrens */ 571fa9e4066Sahrens zv->zv_open_count[otyp]--; 572fa9e4066Sahrens zv->zv_total_opens--; 573fa9e4066Sahrens 574fa9e4066Sahrens mutex_exit(&zvol_state_lock); 575fa9e4066Sahrens 576fa9e4066Sahrens return (0); 577fa9e4066Sahrens } 578fa9e4066Sahrens 579fa9e4066Sahrens int 580fa9e4066Sahrens zvol_strategy(buf_t *bp) 581fa9e4066Sahrens { 582fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 583fa9e4066Sahrens uint64_t off, volsize; 584fa9e4066Sahrens size_t size, resid; 585fa9e4066Sahrens char *addr; 586fa9e4066Sahrens int error = 0; 587fa9e4066Sahrens 588fa9e4066Sahrens if (zv == NULL) { 589fa9e4066Sahrens bioerror(bp, ENXIO); 590fa9e4066Sahrens biodone(bp); 591fa9e4066Sahrens return (0); 592fa9e4066Sahrens } 593fa9e4066Sahrens 594fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 595fa9e4066Sahrens bioerror(bp, EINVAL); 596fa9e4066Sahrens biodone(bp); 597fa9e4066Sahrens return (0); 598fa9e4066Sahrens } 599fa9e4066Sahrens 600fa9e4066Sahrens if (zv->zv_readonly && !(bp->b_flags & B_READ)) { 601fa9e4066Sahrens bioerror(bp, EROFS); 602fa9e4066Sahrens biodone(bp); 603fa9e4066Sahrens return (0); 604fa9e4066Sahrens } 605fa9e4066Sahrens 606fa9e4066Sahrens off = ldbtob(bp->b_blkno); 607fa9e4066Sahrens volsize = zv->zv_volsize; 608fa9e4066Sahrens 609fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 610fa9e4066Sahrens 611fa9e4066Sahrens bp_mapin(bp); 612fa9e4066Sahrens addr = bp->b_un.b_addr; 613fa9e4066Sahrens resid = bp->b_bcount; 614fa9e4066Sahrens 615fa9e4066Sahrens while (resid != 0 && off < volsize) { 616fa9e4066Sahrens 617fa9e4066Sahrens size = MIN(resid, 1UL << 20); /* cap at 1MB per tx */ 618fa9e4066Sahrens 619fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 620fa9e4066Sahrens size = volsize - off; 621fa9e4066Sahrens 622fa9e4066Sahrens if (bp->b_flags & B_READ) { 623fa9e4066Sahrens error = dmu_read_canfail(zv->zv_objset, ZVOL_OBJ, 624fa9e4066Sahrens off, size, addr); 625fa9e4066Sahrens } else { 626fa9e4066Sahrens dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 627fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 628fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 629fa9e4066Sahrens if (error) { 630fa9e4066Sahrens dmu_tx_abort(tx); 631fa9e4066Sahrens } else { 632fa9e4066Sahrens dmu_write(zv->zv_objset, ZVOL_OBJ, 633fa9e4066Sahrens off, size, addr, tx); 634fa9e4066Sahrens dmu_tx_commit(tx); 635fa9e4066Sahrens } 636fa9e4066Sahrens } 637fa9e4066Sahrens if (error) 638fa9e4066Sahrens break; 639fa9e4066Sahrens off += size; 640fa9e4066Sahrens addr += size; 641fa9e4066Sahrens resid -= size; 642fa9e4066Sahrens } 643fa9e4066Sahrens 644fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 645fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 646fa9e4066Sahrens 647fa9e4066Sahrens biodone(bp); 648fa9e4066Sahrens return (0); 649fa9e4066Sahrens } 650fa9e4066Sahrens 651fa9e4066Sahrens /*ARGSUSED*/ 652fa9e4066Sahrens int 653fa9e4066Sahrens zvol_read(dev_t dev, uio_t *uiop, cred_t *cr) 654fa9e4066Sahrens { 655fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_READ, minphys, uiop)); 656fa9e4066Sahrens } 657fa9e4066Sahrens 658fa9e4066Sahrens /*ARGSUSED*/ 659fa9e4066Sahrens int 660fa9e4066Sahrens zvol_write(dev_t dev, uio_t *uiop, cred_t *cr) 661fa9e4066Sahrens { 662fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_WRITE, minphys, uiop)); 663fa9e4066Sahrens } 664fa9e4066Sahrens 665fa9e4066Sahrens /*ARGSUSED*/ 666fa9e4066Sahrens int 667fa9e4066Sahrens zvol_aread(dev_t dev, struct aio_req *aio, cred_t *cr) 668fa9e4066Sahrens { 669fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_READ, minphys, aio)); 670fa9e4066Sahrens } 671fa9e4066Sahrens 672fa9e4066Sahrens /*ARGSUSED*/ 673fa9e4066Sahrens int 674fa9e4066Sahrens zvol_awrite(dev_t dev, struct aio_req *aio, cred_t *cr) 675fa9e4066Sahrens { 676fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_WRITE, minphys, aio)); 677fa9e4066Sahrens } 678fa9e4066Sahrens 679fa9e4066Sahrens /* 680fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 681fa9e4066Sahrens */ 682fa9e4066Sahrens /*ARGSUSED*/ 683fa9e4066Sahrens int 684fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 685fa9e4066Sahrens { 686fa9e4066Sahrens zvol_state_t *zv; 687fa9e4066Sahrens struct dk_cinfo dkc; 688fa9e4066Sahrens struct dk_minfo dkm; 689fa9e4066Sahrens dk_efi_t efi; 690fa9e4066Sahrens efi_gpt_t gpt; 691fa9e4066Sahrens efi_gpe_t gpe; 692fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 693fa9e4066Sahrens uint32_t crc; 694fa9e4066Sahrens int error = 0; 695fa9e4066Sahrens 696fa9e4066Sahrens mutex_enter(&zvol_state_lock); 697fa9e4066Sahrens 698fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 699fa9e4066Sahrens 700fa9e4066Sahrens if (zv == NULL) { 701fa9e4066Sahrens mutex_exit(&zvol_state_lock); 702fa9e4066Sahrens return (ENXIO); 703fa9e4066Sahrens } 704fa9e4066Sahrens 705fa9e4066Sahrens switch (cmd) { 706fa9e4066Sahrens 707fa9e4066Sahrens case DKIOCINFO: 708fa9e4066Sahrens bzero(&dkc, sizeof (dkc)); 709fa9e4066Sahrens (void) strcpy(dkc.dki_cname, "zvol"); 710fa9e4066Sahrens (void) strcpy(dkc.dki_dname, "zvol"); 711fa9e4066Sahrens dkc.dki_ctype = DKC_UNKNOWN; 712fa9e4066Sahrens dkc.dki_maxtransfer = 1 << 15; 713fa9e4066Sahrens mutex_exit(&zvol_state_lock); 714fa9e4066Sahrens if (ddi_copyout(&dkc, (void *)arg, sizeof (dkc), flag)) 715fa9e4066Sahrens error = EFAULT; 716fa9e4066Sahrens return (error); 717fa9e4066Sahrens 718fa9e4066Sahrens case DKIOCGMEDIAINFO: 719fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 720fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 721fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 722fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 723fa9e4066Sahrens mutex_exit(&zvol_state_lock); 724fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 725fa9e4066Sahrens error = EFAULT; 726fa9e4066Sahrens return (error); 727fa9e4066Sahrens 728fa9e4066Sahrens case DKIOCGETEFI: 729fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 730fa9e4066Sahrens mutex_exit(&zvol_state_lock); 731fa9e4066Sahrens return (EFAULT); 732fa9e4066Sahrens } 733fa9e4066Sahrens 734fa9e4066Sahrens bzero(&gpt, sizeof (gpt)); 735fa9e4066Sahrens bzero(&gpe, sizeof (gpe)); 736fa9e4066Sahrens 737fa9e4066Sahrens efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 738fa9e4066Sahrens 739fa9e4066Sahrens if (efi.dki_length < sizeof (gpt) + sizeof (gpe)) { 740fa9e4066Sahrens mutex_exit(&zvol_state_lock); 741fa9e4066Sahrens return (EINVAL); 742fa9e4066Sahrens } 743fa9e4066Sahrens 744fa9e4066Sahrens efi.dki_length = sizeof (gpt) + sizeof (gpe); 745fa9e4066Sahrens 746fa9e4066Sahrens gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 747*5c5460e9Seschrock gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT); 748fa9e4066Sahrens gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 749fa9e4066Sahrens gpt.efi_gpt_FirstUsableLBA = LE_64(0ULL); 750fa9e4066Sahrens gpt.efi_gpt_LastUsableLBA = 751fa9e4066Sahrens LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 752fa9e4066Sahrens gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 753fa9e4066Sahrens gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 754fa9e4066Sahrens 755fa9e4066Sahrens UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 756fa9e4066Sahrens gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 757fa9e4066Sahrens gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 758fa9e4066Sahrens 759fa9e4066Sahrens CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 760fa9e4066Sahrens gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 761fa9e4066Sahrens 762fa9e4066Sahrens CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 763fa9e4066Sahrens gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 764fa9e4066Sahrens 765fa9e4066Sahrens mutex_exit(&zvol_state_lock); 766fa9e4066Sahrens if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag) || 767fa9e4066Sahrens ddi_copyout(&gpe, efi.dki_data + 1, sizeof (gpe), flag)) 768fa9e4066Sahrens error = EFAULT; 769fa9e4066Sahrens return (error); 770fa9e4066Sahrens 771fa9e4066Sahrens default: 772fa9e4066Sahrens error = ENOTSUP; 773fa9e4066Sahrens break; 774fa9e4066Sahrens 775fa9e4066Sahrens } 776fa9e4066Sahrens mutex_exit(&zvol_state_lock); 777fa9e4066Sahrens return (error); 778fa9e4066Sahrens } 779fa9e4066Sahrens 780fa9e4066Sahrens int 781fa9e4066Sahrens zvol_busy(void) 782fa9e4066Sahrens { 783fa9e4066Sahrens return (zvol_minors != 0); 784fa9e4066Sahrens } 785fa9e4066Sahrens 786fa9e4066Sahrens void 787fa9e4066Sahrens zvol_init(void) 788fa9e4066Sahrens { 789fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 790fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 791fa9e4066Sahrens } 792fa9e4066Sahrens 793fa9e4066Sahrens void 794fa9e4066Sahrens zvol_fini(void) 795fa9e4066Sahrens { 796fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 797fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 798fa9e4066Sahrens } 799