1*fa9e4066Sahrens /* 2*fa9e4066Sahrens * CDDL HEADER START 3*fa9e4066Sahrens * 4*fa9e4066Sahrens * The contents of this file are subject to the terms of the 5*fa9e4066Sahrens * Common Development and Distribution License, Version 1.0 only 6*fa9e4066Sahrens * (the "License"). You may not use this file except in compliance 7*fa9e4066Sahrens * with the License. 8*fa9e4066Sahrens * 9*fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 11*fa9e4066Sahrens * See the License for the specific language governing permissions 12*fa9e4066Sahrens * and limitations under the License. 13*fa9e4066Sahrens * 14*fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 15*fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 17*fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 18*fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 19*fa9e4066Sahrens * 20*fa9e4066Sahrens * CDDL HEADER END 21*fa9e4066Sahrens */ 22*fa9e4066Sahrens /* 23*fa9e4066Sahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*fa9e4066Sahrens * Use is subject to license terms. 25*fa9e4066Sahrens */ 26*fa9e4066Sahrens 27*fa9e4066Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 28*fa9e4066Sahrens 29*fa9e4066Sahrens /* 30*fa9e4066Sahrens * ZFS volume emulation driver. 31*fa9e4066Sahrens * 32*fa9e4066Sahrens * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. 33*fa9e4066Sahrens * Volumes are accessed through the symbolic links named: 34*fa9e4066Sahrens * 35*fa9e4066Sahrens * /dev/zvol/dsk/<pool_name>/<dataset_name> 36*fa9e4066Sahrens * /dev/zvol/rdsk/<pool_name>/<dataset_name> 37*fa9e4066Sahrens * 38*fa9e4066Sahrens * These links are created by the ZFS-specific devfsadm link generator. 39*fa9e4066Sahrens * Volumes are persistent through reboot. No user command needs to be 40*fa9e4066Sahrens * run before opening and using a device. 41*fa9e4066Sahrens */ 42*fa9e4066Sahrens 43*fa9e4066Sahrens #include <sys/types.h> 44*fa9e4066Sahrens #include <sys/param.h> 45*fa9e4066Sahrens #include <sys/errno.h> 46*fa9e4066Sahrens #include <sys/aio_req.h> 47*fa9e4066Sahrens #include <sys/uio.h> 48*fa9e4066Sahrens #include <sys/buf.h> 49*fa9e4066Sahrens #include <sys/modctl.h> 50*fa9e4066Sahrens #include <sys/open.h> 51*fa9e4066Sahrens #include <sys/kmem.h> 52*fa9e4066Sahrens #include <sys/conf.h> 53*fa9e4066Sahrens #include <sys/cmn_err.h> 54*fa9e4066Sahrens #include <sys/stat.h> 55*fa9e4066Sahrens #include <sys/zap.h> 56*fa9e4066Sahrens #include <sys/spa.h> 57*fa9e4066Sahrens #include <sys/zio.h> 58*fa9e4066Sahrens #include <sys/dsl_prop.h> 59*fa9e4066Sahrens #include <sys/dkio.h> 60*fa9e4066Sahrens #include <sys/efi_partition.h> 61*fa9e4066Sahrens #include <sys/byteorder.h> 62*fa9e4066Sahrens #include <sys/pathname.h> 63*fa9e4066Sahrens #include <sys/ddi.h> 64*fa9e4066Sahrens #include <sys/sunddi.h> 65*fa9e4066Sahrens #include <sys/crc32.h> 66*fa9e4066Sahrens #include <sys/dirent.h> 67*fa9e4066Sahrens #include <sys/policy.h> 68*fa9e4066Sahrens #include <sys/fs/zfs.h> 69*fa9e4066Sahrens #include <sys/zfs_ioctl.h> 70*fa9e4066Sahrens #include <sys/mkdev.h> 71*fa9e4066Sahrens 72*fa9e4066Sahrens #include "zfs_namecheck.h" 73*fa9e4066Sahrens 74*fa9e4066Sahrens #define ZVOL_OBJ 1ULL 75*fa9e4066Sahrens #define ZVOL_ZAP_OBJ 2ULL 76*fa9e4066Sahrens #define ZVOL_MAX_MINOR MAXMIN32 77*fa9e4066Sahrens 78*fa9e4066Sahrens static void *zvol_state; 79*fa9e4066Sahrens 80*fa9e4066Sahrens /* 81*fa9e4066Sahrens * This lock protects the zvol_state structure from being modified 82*fa9e4066Sahrens * while it's being used, e.g. an open that comes in before a create 83*fa9e4066Sahrens * finishes. It also protects temporary opens of the dataset so that, 84*fa9e4066Sahrens * e.g., an open doesn't get a spurious EBUSY. 85*fa9e4066Sahrens */ 86*fa9e4066Sahrens static kmutex_t zvol_state_lock; 87*fa9e4066Sahrens static uint32_t zvol_minors; 88*fa9e4066Sahrens 89*fa9e4066Sahrens /* 90*fa9e4066Sahrens * The in-core state of each volume. 91*fa9e4066Sahrens */ 92*fa9e4066Sahrens typedef struct zvol_state { 93*fa9e4066Sahrens char zv_name[MAXPATHLEN]; /* pool/dd name */ 94*fa9e4066Sahrens uint64_t zv_volsize; /* amount of space we advertise */ 95*fa9e4066Sahrens minor_t zv_minor; /* minor number */ 96*fa9e4066Sahrens uint8_t zv_min_bs; /* minimum addressable block shift */ 97*fa9e4066Sahrens uint8_t zv_readonly; /* hard readonly; like write-protect */ 98*fa9e4066Sahrens objset_t *zv_objset; /* objset handle */ 99*fa9e4066Sahrens uint32_t zv_mode; /* DS_MODE_* flags at open time */ 100*fa9e4066Sahrens uint32_t zv_open_count[OTYPCNT]; /* open counts */ 101*fa9e4066Sahrens uint32_t zv_total_opens; /* total open count */ 102*fa9e4066Sahrens } zvol_state_t; 103*fa9e4066Sahrens 104*fa9e4066Sahrens static void 105*fa9e4066Sahrens zvol_size_changed(zvol_state_t *zv, dev_t dev) 106*fa9e4066Sahrens { 107*fa9e4066Sahrens dev = makedevice(getmajor(dev), zv->zv_minor); 108*fa9e4066Sahrens 109*fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 110*fa9e4066Sahrens "Size", zv->zv_volsize) == DDI_SUCCESS); 111*fa9e4066Sahrens VERIFY(ddi_prop_update_int64(dev, zfs_dip, 112*fa9e4066Sahrens "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS); 113*fa9e4066Sahrens } 114*fa9e4066Sahrens 115*fa9e4066Sahrens int 116*fa9e4066Sahrens zvol_check_volsize(zfs_cmd_t *zc) 117*fa9e4066Sahrens { 118*fa9e4066Sahrens if (zc->zc_volsize == 0) 119*fa9e4066Sahrens return (EINVAL); 120*fa9e4066Sahrens 121*fa9e4066Sahrens zc->zc_volsize = P2ROUNDUP(zc->zc_volsize, SPA_MAXBLOCKSIZE); 122*fa9e4066Sahrens #ifdef _ILP32 123*fa9e4066Sahrens if (zc->zc_volsize - 1 > SPEC_MAXOFFSET_T) 124*fa9e4066Sahrens return (EOVERFLOW); 125*fa9e4066Sahrens #endif 126*fa9e4066Sahrens return (0); 127*fa9e4066Sahrens } 128*fa9e4066Sahrens 129*fa9e4066Sahrens int 130*fa9e4066Sahrens zvol_check_volblocksize(zfs_cmd_t *zc) 131*fa9e4066Sahrens { 132*fa9e4066Sahrens if (zc->zc_volblocksize < SPA_MINBLOCKSIZE || 133*fa9e4066Sahrens zc->zc_volblocksize > SPA_MAXBLOCKSIZE || 134*fa9e4066Sahrens !ISP2(zc->zc_volblocksize)) 135*fa9e4066Sahrens return (EDOM); 136*fa9e4066Sahrens 137*fa9e4066Sahrens return (0); 138*fa9e4066Sahrens } 139*fa9e4066Sahrens 140*fa9e4066Sahrens static void 141*fa9e4066Sahrens zvol_readonly_changed_cb(void *arg, uint64_t newval) 142*fa9e4066Sahrens { 143*fa9e4066Sahrens zvol_state_t *zv = arg; 144*fa9e4066Sahrens 145*fa9e4066Sahrens zv->zv_readonly = (uint8_t)newval; 146*fa9e4066Sahrens } 147*fa9e4066Sahrens 148*fa9e4066Sahrens int 149*fa9e4066Sahrens zvol_get_stats(zfs_cmd_t *zc, objset_t *os) 150*fa9e4066Sahrens { 151*fa9e4066Sahrens int error; 152*fa9e4066Sahrens dmu_object_info_t doi; 153*fa9e4066Sahrens 154*fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize); 155*fa9e4066Sahrens 156*fa9e4066Sahrens if (error) 157*fa9e4066Sahrens return (error); 158*fa9e4066Sahrens 159*fa9e4066Sahrens error = dmu_object_info(os, ZVOL_OBJ, &doi); 160*fa9e4066Sahrens 161*fa9e4066Sahrens if (error == 0) 162*fa9e4066Sahrens zc->zc_volblocksize = doi.doi_data_block_size; 163*fa9e4066Sahrens 164*fa9e4066Sahrens return (error); 165*fa9e4066Sahrens } 166*fa9e4066Sahrens 167*fa9e4066Sahrens /* 168*fa9e4066Sahrens * Find a free minor number. 169*fa9e4066Sahrens */ 170*fa9e4066Sahrens static minor_t 171*fa9e4066Sahrens zvol_minor_alloc(void) 172*fa9e4066Sahrens { 173*fa9e4066Sahrens minor_t minor; 174*fa9e4066Sahrens 175*fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 176*fa9e4066Sahrens 177*fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) 178*fa9e4066Sahrens if (ddi_get_soft_state(zvol_state, minor) == NULL) 179*fa9e4066Sahrens return (minor); 180*fa9e4066Sahrens 181*fa9e4066Sahrens return (0); 182*fa9e4066Sahrens } 183*fa9e4066Sahrens 184*fa9e4066Sahrens static zvol_state_t * 185*fa9e4066Sahrens zvol_minor_lookup(char *name) 186*fa9e4066Sahrens { 187*fa9e4066Sahrens minor_t minor; 188*fa9e4066Sahrens zvol_state_t *zv; 189*fa9e4066Sahrens 190*fa9e4066Sahrens ASSERT(MUTEX_HELD(&zvol_state_lock)); 191*fa9e4066Sahrens 192*fa9e4066Sahrens for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) { 193*fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 194*fa9e4066Sahrens if (zv == NULL) 195*fa9e4066Sahrens continue; 196*fa9e4066Sahrens if (strcmp(zv->zv_name, name) == 0) 197*fa9e4066Sahrens break; 198*fa9e4066Sahrens } 199*fa9e4066Sahrens 200*fa9e4066Sahrens return (zv); 201*fa9e4066Sahrens } 202*fa9e4066Sahrens 203*fa9e4066Sahrens void 204*fa9e4066Sahrens zvol_create_cb(objset_t *os, void *arg, dmu_tx_t *tx) 205*fa9e4066Sahrens { 206*fa9e4066Sahrens zfs_cmd_t *zc = arg; 207*fa9e4066Sahrens int error; 208*fa9e4066Sahrens 209*fa9e4066Sahrens error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, zc->zc_volblocksize, 210*fa9e4066Sahrens DMU_OT_NONE, 0, tx); 211*fa9e4066Sahrens ASSERT(error == 0); 212*fa9e4066Sahrens 213*fa9e4066Sahrens error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, 214*fa9e4066Sahrens DMU_OT_NONE, 0, tx); 215*fa9e4066Sahrens ASSERT(error == 0); 216*fa9e4066Sahrens 217*fa9e4066Sahrens error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &zc->zc_volsize, tx); 218*fa9e4066Sahrens ASSERT(error == 0); 219*fa9e4066Sahrens } 220*fa9e4066Sahrens 221*fa9e4066Sahrens /* 222*fa9e4066Sahrens * Create a minor node for the specified volume. 223*fa9e4066Sahrens */ 224*fa9e4066Sahrens int 225*fa9e4066Sahrens zvol_create_minor(zfs_cmd_t *zc) 226*fa9e4066Sahrens { 227*fa9e4066Sahrens char *name = zc->zc_name; 228*fa9e4066Sahrens dev_t dev = zc->zc_dev; 229*fa9e4066Sahrens zvol_state_t *zv; 230*fa9e4066Sahrens objset_t *os; 231*fa9e4066Sahrens uint64_t volsize; 232*fa9e4066Sahrens minor_t minor = 0; 233*fa9e4066Sahrens struct pathname linkpath; 234*fa9e4066Sahrens int ds_mode = DS_MODE_PRIMARY; 235*fa9e4066Sahrens vnode_t *vp = NULL; 236*fa9e4066Sahrens char *devpath; 237*fa9e4066Sahrens size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + 1 + strlen(name) + 1; 238*fa9e4066Sahrens char chrbuf[30], blkbuf[30]; 239*fa9e4066Sahrens int error; 240*fa9e4066Sahrens 241*fa9e4066Sahrens mutex_enter(&zvol_state_lock); 242*fa9e4066Sahrens 243*fa9e4066Sahrens if ((zv = zvol_minor_lookup(name)) != NULL) { 244*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 245*fa9e4066Sahrens return (EEXIST); 246*fa9e4066Sahrens } 247*fa9e4066Sahrens 248*fa9e4066Sahrens if (strchr(name, '@') != 0) 249*fa9e4066Sahrens ds_mode |= DS_MODE_READONLY; 250*fa9e4066Sahrens 251*fa9e4066Sahrens error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); 252*fa9e4066Sahrens 253*fa9e4066Sahrens if (error) { 254*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 255*fa9e4066Sahrens return (error); 256*fa9e4066Sahrens } 257*fa9e4066Sahrens 258*fa9e4066Sahrens error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); 259*fa9e4066Sahrens 260*fa9e4066Sahrens if (error) { 261*fa9e4066Sahrens dmu_objset_close(os); 262*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 263*fa9e4066Sahrens return (error); 264*fa9e4066Sahrens } 265*fa9e4066Sahrens 266*fa9e4066Sahrens /* 267*fa9e4066Sahrens * If there's an existing /dev/zvol symlink, try to use the 268*fa9e4066Sahrens * same minor number we used last time. 269*fa9e4066Sahrens */ 270*fa9e4066Sahrens devpath = kmem_alloc(devpathlen, KM_SLEEP); 271*fa9e4066Sahrens 272*fa9e4066Sahrens (void) sprintf(devpath, "%s/%s", ZVOL_FULL_DEV_DIR, name); 273*fa9e4066Sahrens 274*fa9e4066Sahrens error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp); 275*fa9e4066Sahrens 276*fa9e4066Sahrens kmem_free(devpath, devpathlen); 277*fa9e4066Sahrens 278*fa9e4066Sahrens if (error == 0 && vp->v_type != VLNK) 279*fa9e4066Sahrens error = EINVAL; 280*fa9e4066Sahrens 281*fa9e4066Sahrens if (error == 0) { 282*fa9e4066Sahrens pn_alloc(&linkpath); 283*fa9e4066Sahrens error = pn_getsymlink(vp, &linkpath, kcred); 284*fa9e4066Sahrens if (error == 0) { 285*fa9e4066Sahrens char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV); 286*fa9e4066Sahrens if (ms != NULL) { 287*fa9e4066Sahrens ms += strlen(ZVOL_PSEUDO_DEV); 288*fa9e4066Sahrens minor = stoi(&ms); 289*fa9e4066Sahrens } 290*fa9e4066Sahrens } 291*fa9e4066Sahrens pn_free(&linkpath); 292*fa9e4066Sahrens } 293*fa9e4066Sahrens 294*fa9e4066Sahrens if (vp != NULL) 295*fa9e4066Sahrens VN_RELE(vp); 296*fa9e4066Sahrens 297*fa9e4066Sahrens /* 298*fa9e4066Sahrens * If we found a minor but it's already in use, we must pick a new one. 299*fa9e4066Sahrens */ 300*fa9e4066Sahrens if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL) 301*fa9e4066Sahrens minor = 0; 302*fa9e4066Sahrens 303*fa9e4066Sahrens if (minor == 0) 304*fa9e4066Sahrens minor = zvol_minor_alloc(); 305*fa9e4066Sahrens 306*fa9e4066Sahrens if (minor == 0) { 307*fa9e4066Sahrens dmu_objset_close(os); 308*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 309*fa9e4066Sahrens return (ENXIO); 310*fa9e4066Sahrens } 311*fa9e4066Sahrens 312*fa9e4066Sahrens if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) { 313*fa9e4066Sahrens dmu_objset_close(os); 314*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 315*fa9e4066Sahrens return (EAGAIN); 316*fa9e4066Sahrens } 317*fa9e4066Sahrens 318*fa9e4066Sahrens (void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME, name); 319*fa9e4066Sahrens 320*fa9e4066Sahrens (void) sprintf(chrbuf, "%uc,raw", minor); 321*fa9e4066Sahrens 322*fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR, 323*fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 324*fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 325*fa9e4066Sahrens dmu_objset_close(os); 326*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 327*fa9e4066Sahrens return (EAGAIN); 328*fa9e4066Sahrens } 329*fa9e4066Sahrens 330*fa9e4066Sahrens (void) sprintf(blkbuf, "%uc", minor); 331*fa9e4066Sahrens 332*fa9e4066Sahrens if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK, 333*fa9e4066Sahrens minor, DDI_PSEUDO, 0) == DDI_FAILURE) { 334*fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, chrbuf); 335*fa9e4066Sahrens ddi_soft_state_free(zvol_state, minor); 336*fa9e4066Sahrens dmu_objset_close(os); 337*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 338*fa9e4066Sahrens return (EAGAIN); 339*fa9e4066Sahrens } 340*fa9e4066Sahrens 341*fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 342*fa9e4066Sahrens 343*fa9e4066Sahrens (void) strcpy(zv->zv_name, name); 344*fa9e4066Sahrens zv->zv_min_bs = DEV_BSHIFT; 345*fa9e4066Sahrens zv->zv_minor = minor; 346*fa9e4066Sahrens zv->zv_volsize = volsize; 347*fa9e4066Sahrens zv->zv_objset = os; 348*fa9e4066Sahrens zv->zv_mode = ds_mode; 349*fa9e4066Sahrens 350*fa9e4066Sahrens zvol_size_changed(zv, dev); 351*fa9e4066Sahrens 352*fa9e4066Sahrens VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), 353*fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 354*fa9e4066Sahrens 355*fa9e4066Sahrens zvol_minors++; 356*fa9e4066Sahrens 357*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 358*fa9e4066Sahrens 359*fa9e4066Sahrens return (0); 360*fa9e4066Sahrens } 361*fa9e4066Sahrens 362*fa9e4066Sahrens /* 363*fa9e4066Sahrens * Remove minor node for the specified volume. 364*fa9e4066Sahrens */ 365*fa9e4066Sahrens int 366*fa9e4066Sahrens zvol_remove_minor(zfs_cmd_t *zc) 367*fa9e4066Sahrens { 368*fa9e4066Sahrens zvol_state_t *zv; 369*fa9e4066Sahrens char namebuf[30]; 370*fa9e4066Sahrens 371*fa9e4066Sahrens mutex_enter(&zvol_state_lock); 372*fa9e4066Sahrens 373*fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 374*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 375*fa9e4066Sahrens return (ENXIO); 376*fa9e4066Sahrens } 377*fa9e4066Sahrens 378*fa9e4066Sahrens if (zv->zv_total_opens != 0) { 379*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 380*fa9e4066Sahrens return (EBUSY); 381*fa9e4066Sahrens } 382*fa9e4066Sahrens 383*fa9e4066Sahrens (void) sprintf(namebuf, "%uc,raw", zv->zv_minor); 384*fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 385*fa9e4066Sahrens 386*fa9e4066Sahrens (void) sprintf(namebuf, "%uc", zv->zv_minor); 387*fa9e4066Sahrens ddi_remove_minor_node(zfs_dip, namebuf); 388*fa9e4066Sahrens 389*fa9e4066Sahrens VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), 390*fa9e4066Sahrens "readonly", zvol_readonly_changed_cb, zv) == 0); 391*fa9e4066Sahrens 392*fa9e4066Sahrens dmu_objset_close(zv->zv_objset); 393*fa9e4066Sahrens 394*fa9e4066Sahrens zv->zv_objset = NULL; 395*fa9e4066Sahrens 396*fa9e4066Sahrens ddi_soft_state_free(zvol_state, zv->zv_minor); 397*fa9e4066Sahrens 398*fa9e4066Sahrens zvol_minors--; 399*fa9e4066Sahrens 400*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 401*fa9e4066Sahrens 402*fa9e4066Sahrens return (0); 403*fa9e4066Sahrens } 404*fa9e4066Sahrens 405*fa9e4066Sahrens int 406*fa9e4066Sahrens zvol_set_volsize(zfs_cmd_t *zc) 407*fa9e4066Sahrens { 408*fa9e4066Sahrens zvol_state_t *zv; 409*fa9e4066Sahrens dev_t dev = zc->zc_dev; 410*fa9e4066Sahrens dmu_tx_t *tx; 411*fa9e4066Sahrens int error; 412*fa9e4066Sahrens 413*fa9e4066Sahrens if ((error = zvol_check_volsize(zc)) != 0) 414*fa9e4066Sahrens return (error); 415*fa9e4066Sahrens 416*fa9e4066Sahrens mutex_enter(&zvol_state_lock); 417*fa9e4066Sahrens 418*fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 419*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 420*fa9e4066Sahrens return (ENXIO); 421*fa9e4066Sahrens } 422*fa9e4066Sahrens 423*fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 424*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 425*fa9e4066Sahrens return (EROFS); 426*fa9e4066Sahrens } 427*fa9e4066Sahrens 428*fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 429*fa9e4066Sahrens dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, 1); 430*fa9e4066Sahrens dmu_tx_hold_free(tx, ZVOL_OBJ, zc->zc_volsize, DMU_OBJECT_END); 431*fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 432*fa9e4066Sahrens if (error) { 433*fa9e4066Sahrens dmu_tx_abort(tx); 434*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 435*fa9e4066Sahrens return (error); 436*fa9e4066Sahrens } 437*fa9e4066Sahrens 438*fa9e4066Sahrens error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, 439*fa9e4066Sahrens &zc->zc_volsize, tx); 440*fa9e4066Sahrens if (error == 0) 441*fa9e4066Sahrens dmu_free_range(zv->zv_objset, ZVOL_OBJ, zc->zc_volsize, 442*fa9e4066Sahrens DMU_OBJECT_END, tx); 443*fa9e4066Sahrens 444*fa9e4066Sahrens dmu_tx_commit(tx); 445*fa9e4066Sahrens 446*fa9e4066Sahrens if (error == 0) { 447*fa9e4066Sahrens zv->zv_volsize = zc->zc_volsize; 448*fa9e4066Sahrens zvol_size_changed(zv, dev); 449*fa9e4066Sahrens } 450*fa9e4066Sahrens 451*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 452*fa9e4066Sahrens 453*fa9e4066Sahrens return (error); 454*fa9e4066Sahrens } 455*fa9e4066Sahrens 456*fa9e4066Sahrens int 457*fa9e4066Sahrens zvol_set_volblocksize(zfs_cmd_t *zc) 458*fa9e4066Sahrens { 459*fa9e4066Sahrens zvol_state_t *zv; 460*fa9e4066Sahrens dmu_tx_t *tx; 461*fa9e4066Sahrens int error; 462*fa9e4066Sahrens 463*fa9e4066Sahrens mutex_enter(&zvol_state_lock); 464*fa9e4066Sahrens 465*fa9e4066Sahrens if ((zv = zvol_minor_lookup(zc->zc_name)) == NULL) { 466*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 467*fa9e4066Sahrens return (ENXIO); 468*fa9e4066Sahrens } 469*fa9e4066Sahrens 470*fa9e4066Sahrens if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { 471*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 472*fa9e4066Sahrens return (EROFS); 473*fa9e4066Sahrens } 474*fa9e4066Sahrens 475*fa9e4066Sahrens tx = dmu_tx_create(zv->zv_objset); 476*fa9e4066Sahrens dmu_tx_hold_bonus(tx, ZVOL_OBJ); 477*fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 478*fa9e4066Sahrens if (error) { 479*fa9e4066Sahrens dmu_tx_abort(tx); 480*fa9e4066Sahrens } else { 481*fa9e4066Sahrens error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, 482*fa9e4066Sahrens zc->zc_volblocksize, 0, tx); 483*fa9e4066Sahrens if (error == ENOTSUP) 484*fa9e4066Sahrens error = EBUSY; 485*fa9e4066Sahrens dmu_tx_commit(tx); 486*fa9e4066Sahrens } 487*fa9e4066Sahrens 488*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 489*fa9e4066Sahrens 490*fa9e4066Sahrens return (error); 491*fa9e4066Sahrens } 492*fa9e4066Sahrens 493*fa9e4066Sahrens /*ARGSUSED*/ 494*fa9e4066Sahrens int 495*fa9e4066Sahrens zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr) 496*fa9e4066Sahrens { 497*fa9e4066Sahrens minor_t minor = getminor(*devp); 498*fa9e4066Sahrens zvol_state_t *zv; 499*fa9e4066Sahrens 500*fa9e4066Sahrens if (minor == 0) /* This is the control device */ 501*fa9e4066Sahrens return (0); 502*fa9e4066Sahrens 503*fa9e4066Sahrens mutex_enter(&zvol_state_lock); 504*fa9e4066Sahrens 505*fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 506*fa9e4066Sahrens if (zv == NULL) { 507*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 508*fa9e4066Sahrens return (ENXIO); 509*fa9e4066Sahrens } 510*fa9e4066Sahrens 511*fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 512*fa9e4066Sahrens 513*fa9e4066Sahrens if ((flag & FWRITE) && 514*fa9e4066Sahrens (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) { 515*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 516*fa9e4066Sahrens return (EROFS); 517*fa9e4066Sahrens } 518*fa9e4066Sahrens 519*fa9e4066Sahrens if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) { 520*fa9e4066Sahrens zv->zv_open_count[otyp]++; 521*fa9e4066Sahrens zv->zv_total_opens++; 522*fa9e4066Sahrens } 523*fa9e4066Sahrens 524*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 525*fa9e4066Sahrens 526*fa9e4066Sahrens return (0); 527*fa9e4066Sahrens } 528*fa9e4066Sahrens 529*fa9e4066Sahrens /*ARGSUSED*/ 530*fa9e4066Sahrens int 531*fa9e4066Sahrens zvol_close(dev_t dev, int flag, int otyp, cred_t *cr) 532*fa9e4066Sahrens { 533*fa9e4066Sahrens minor_t minor = getminor(dev); 534*fa9e4066Sahrens zvol_state_t *zv; 535*fa9e4066Sahrens 536*fa9e4066Sahrens if (minor == 0) /* This is the control device */ 537*fa9e4066Sahrens return (0); 538*fa9e4066Sahrens 539*fa9e4066Sahrens mutex_enter(&zvol_state_lock); 540*fa9e4066Sahrens 541*fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, minor); 542*fa9e4066Sahrens if (zv == NULL) { 543*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 544*fa9e4066Sahrens return (ENXIO); 545*fa9e4066Sahrens } 546*fa9e4066Sahrens 547*fa9e4066Sahrens /* 548*fa9e4066Sahrens * The next statement is a workaround for the following DDI bug: 549*fa9e4066Sahrens * 6343604 specfs race: multiple "last-close" of the same device 550*fa9e4066Sahrens */ 551*fa9e4066Sahrens if (zv->zv_total_opens == 0) { 552*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 553*fa9e4066Sahrens return (0); 554*fa9e4066Sahrens } 555*fa9e4066Sahrens 556*fa9e4066Sahrens /* 557*fa9e4066Sahrens * If the open count is zero, this is a spurious close. 558*fa9e4066Sahrens * That indicates a bug in the kernel / DDI framework. 559*fa9e4066Sahrens */ 560*fa9e4066Sahrens ASSERT(zv->zv_open_count[otyp] != 0); 561*fa9e4066Sahrens ASSERT(zv->zv_total_opens != 0); 562*fa9e4066Sahrens 563*fa9e4066Sahrens /* 564*fa9e4066Sahrens * You may get multiple opens, but only one close. 565*fa9e4066Sahrens */ 566*fa9e4066Sahrens zv->zv_open_count[otyp]--; 567*fa9e4066Sahrens zv->zv_total_opens--; 568*fa9e4066Sahrens 569*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 570*fa9e4066Sahrens 571*fa9e4066Sahrens return (0); 572*fa9e4066Sahrens } 573*fa9e4066Sahrens 574*fa9e4066Sahrens int 575*fa9e4066Sahrens zvol_strategy(buf_t *bp) 576*fa9e4066Sahrens { 577*fa9e4066Sahrens zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev)); 578*fa9e4066Sahrens uint64_t off, volsize; 579*fa9e4066Sahrens size_t size, resid; 580*fa9e4066Sahrens char *addr; 581*fa9e4066Sahrens int error = 0; 582*fa9e4066Sahrens 583*fa9e4066Sahrens if (zv == NULL) { 584*fa9e4066Sahrens bioerror(bp, ENXIO); 585*fa9e4066Sahrens biodone(bp); 586*fa9e4066Sahrens return (0); 587*fa9e4066Sahrens } 588*fa9e4066Sahrens 589*fa9e4066Sahrens if (getminor(bp->b_edev) == 0) { 590*fa9e4066Sahrens bioerror(bp, EINVAL); 591*fa9e4066Sahrens biodone(bp); 592*fa9e4066Sahrens return (0); 593*fa9e4066Sahrens } 594*fa9e4066Sahrens 595*fa9e4066Sahrens if (zv->zv_readonly && !(bp->b_flags & B_READ)) { 596*fa9e4066Sahrens bioerror(bp, EROFS); 597*fa9e4066Sahrens biodone(bp); 598*fa9e4066Sahrens return (0); 599*fa9e4066Sahrens } 600*fa9e4066Sahrens 601*fa9e4066Sahrens off = ldbtob(bp->b_blkno); 602*fa9e4066Sahrens volsize = zv->zv_volsize; 603*fa9e4066Sahrens 604*fa9e4066Sahrens ASSERT(zv->zv_objset != NULL); 605*fa9e4066Sahrens 606*fa9e4066Sahrens bp_mapin(bp); 607*fa9e4066Sahrens addr = bp->b_un.b_addr; 608*fa9e4066Sahrens resid = bp->b_bcount; 609*fa9e4066Sahrens 610*fa9e4066Sahrens while (resid != 0 && off < volsize) { 611*fa9e4066Sahrens 612*fa9e4066Sahrens size = MIN(resid, 1UL << 20); /* cap at 1MB per tx */ 613*fa9e4066Sahrens 614*fa9e4066Sahrens if (size > volsize - off) /* don't write past the end */ 615*fa9e4066Sahrens size = volsize - off; 616*fa9e4066Sahrens 617*fa9e4066Sahrens if (bp->b_flags & B_READ) { 618*fa9e4066Sahrens error = dmu_read_canfail(zv->zv_objset, ZVOL_OBJ, 619*fa9e4066Sahrens off, size, addr); 620*fa9e4066Sahrens } else { 621*fa9e4066Sahrens dmu_tx_t *tx = dmu_tx_create(zv->zv_objset); 622*fa9e4066Sahrens dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); 623*fa9e4066Sahrens error = dmu_tx_assign(tx, TXG_WAIT); 624*fa9e4066Sahrens if (error) { 625*fa9e4066Sahrens dmu_tx_abort(tx); 626*fa9e4066Sahrens } else { 627*fa9e4066Sahrens dmu_write(zv->zv_objset, ZVOL_OBJ, 628*fa9e4066Sahrens off, size, addr, tx); 629*fa9e4066Sahrens dmu_tx_commit(tx); 630*fa9e4066Sahrens } 631*fa9e4066Sahrens } 632*fa9e4066Sahrens if (error) 633*fa9e4066Sahrens break; 634*fa9e4066Sahrens off += size; 635*fa9e4066Sahrens addr += size; 636*fa9e4066Sahrens resid -= size; 637*fa9e4066Sahrens } 638*fa9e4066Sahrens 639*fa9e4066Sahrens if ((bp->b_resid = resid) == bp->b_bcount) 640*fa9e4066Sahrens bioerror(bp, off > volsize ? EINVAL : error); 641*fa9e4066Sahrens 642*fa9e4066Sahrens biodone(bp); 643*fa9e4066Sahrens return (0); 644*fa9e4066Sahrens } 645*fa9e4066Sahrens 646*fa9e4066Sahrens /*ARGSUSED*/ 647*fa9e4066Sahrens int 648*fa9e4066Sahrens zvol_read(dev_t dev, uio_t *uiop, cred_t *cr) 649*fa9e4066Sahrens { 650*fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_READ, minphys, uiop)); 651*fa9e4066Sahrens } 652*fa9e4066Sahrens 653*fa9e4066Sahrens /*ARGSUSED*/ 654*fa9e4066Sahrens int 655*fa9e4066Sahrens zvol_write(dev_t dev, uio_t *uiop, cred_t *cr) 656*fa9e4066Sahrens { 657*fa9e4066Sahrens return (physio(zvol_strategy, NULL, dev, B_WRITE, minphys, uiop)); 658*fa9e4066Sahrens } 659*fa9e4066Sahrens 660*fa9e4066Sahrens /*ARGSUSED*/ 661*fa9e4066Sahrens int 662*fa9e4066Sahrens zvol_aread(dev_t dev, struct aio_req *aio, cred_t *cr) 663*fa9e4066Sahrens { 664*fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_READ, minphys, aio)); 665*fa9e4066Sahrens } 666*fa9e4066Sahrens 667*fa9e4066Sahrens /*ARGSUSED*/ 668*fa9e4066Sahrens int 669*fa9e4066Sahrens zvol_awrite(dev_t dev, struct aio_req *aio, cred_t *cr) 670*fa9e4066Sahrens { 671*fa9e4066Sahrens return (aphysio(zvol_strategy, anocancel, dev, B_WRITE, minphys, aio)); 672*fa9e4066Sahrens } 673*fa9e4066Sahrens 674*fa9e4066Sahrens /* 675*fa9e4066Sahrens * Dirtbag ioctls to support mkfs(1M) for UFS filesystems. See dkio(7I). 676*fa9e4066Sahrens */ 677*fa9e4066Sahrens /*ARGSUSED*/ 678*fa9e4066Sahrens int 679*fa9e4066Sahrens zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp) 680*fa9e4066Sahrens { 681*fa9e4066Sahrens zvol_state_t *zv; 682*fa9e4066Sahrens struct dk_cinfo dkc; 683*fa9e4066Sahrens struct dk_minfo dkm; 684*fa9e4066Sahrens dk_efi_t efi; 685*fa9e4066Sahrens efi_gpt_t gpt; 686*fa9e4066Sahrens efi_gpe_t gpe; 687*fa9e4066Sahrens struct uuid uuid = EFI_RESERVED; 688*fa9e4066Sahrens uint32_t crc; 689*fa9e4066Sahrens int error = 0; 690*fa9e4066Sahrens 691*fa9e4066Sahrens mutex_enter(&zvol_state_lock); 692*fa9e4066Sahrens 693*fa9e4066Sahrens zv = ddi_get_soft_state(zvol_state, getminor(dev)); 694*fa9e4066Sahrens 695*fa9e4066Sahrens if (zv == NULL) { 696*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 697*fa9e4066Sahrens return (ENXIO); 698*fa9e4066Sahrens } 699*fa9e4066Sahrens 700*fa9e4066Sahrens switch (cmd) { 701*fa9e4066Sahrens 702*fa9e4066Sahrens case DKIOCINFO: 703*fa9e4066Sahrens bzero(&dkc, sizeof (dkc)); 704*fa9e4066Sahrens (void) strcpy(dkc.dki_cname, "zvol"); 705*fa9e4066Sahrens (void) strcpy(dkc.dki_dname, "zvol"); 706*fa9e4066Sahrens dkc.dki_ctype = DKC_UNKNOWN; 707*fa9e4066Sahrens dkc.dki_maxtransfer = 1 << 15; 708*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 709*fa9e4066Sahrens if (ddi_copyout(&dkc, (void *)arg, sizeof (dkc), flag)) 710*fa9e4066Sahrens error = EFAULT; 711*fa9e4066Sahrens return (error); 712*fa9e4066Sahrens 713*fa9e4066Sahrens case DKIOCGMEDIAINFO: 714*fa9e4066Sahrens bzero(&dkm, sizeof (dkm)); 715*fa9e4066Sahrens dkm.dki_lbsize = 1U << zv->zv_min_bs; 716*fa9e4066Sahrens dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs; 717*fa9e4066Sahrens dkm.dki_media_type = DK_UNKNOWN; 718*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 719*fa9e4066Sahrens if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag)) 720*fa9e4066Sahrens error = EFAULT; 721*fa9e4066Sahrens return (error); 722*fa9e4066Sahrens 723*fa9e4066Sahrens case DKIOCGETEFI: 724*fa9e4066Sahrens if (ddi_copyin((void *)arg, &efi, sizeof (dk_efi_t), flag)) { 725*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 726*fa9e4066Sahrens return (EFAULT); 727*fa9e4066Sahrens } 728*fa9e4066Sahrens 729*fa9e4066Sahrens bzero(&gpt, sizeof (gpt)); 730*fa9e4066Sahrens bzero(&gpe, sizeof (gpe)); 731*fa9e4066Sahrens 732*fa9e4066Sahrens efi.dki_data = (void *)(uintptr_t)efi.dki_data_64; 733*fa9e4066Sahrens 734*fa9e4066Sahrens if (efi.dki_length < sizeof (gpt) + sizeof (gpe)) { 735*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 736*fa9e4066Sahrens return (EINVAL); 737*fa9e4066Sahrens } 738*fa9e4066Sahrens 739*fa9e4066Sahrens efi.dki_length = sizeof (gpt) + sizeof (gpe); 740*fa9e4066Sahrens 741*fa9e4066Sahrens gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE); 742*fa9e4066Sahrens gpt.efi_gpt_Revision = LE_32(EFI_VERSION102); 743*fa9e4066Sahrens gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt)); 744*fa9e4066Sahrens gpt.efi_gpt_FirstUsableLBA = LE_64(0ULL); 745*fa9e4066Sahrens gpt.efi_gpt_LastUsableLBA = 746*fa9e4066Sahrens LE_64((zv->zv_volsize >> zv->zv_min_bs) - 1); 747*fa9e4066Sahrens gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1); 748*fa9e4066Sahrens gpt.efi_gpt_SizeOfPartitionEntry = LE_32(sizeof (gpe)); 749*fa9e4066Sahrens 750*fa9e4066Sahrens UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid); 751*fa9e4066Sahrens gpe.efi_gpe_StartingLBA = gpt.efi_gpt_FirstUsableLBA; 752*fa9e4066Sahrens gpe.efi_gpe_EndingLBA = gpt.efi_gpt_LastUsableLBA; 753*fa9e4066Sahrens 754*fa9e4066Sahrens CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table); 755*fa9e4066Sahrens gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc); 756*fa9e4066Sahrens 757*fa9e4066Sahrens CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table); 758*fa9e4066Sahrens gpt.efi_gpt_HeaderCRC32 = LE_32(~crc); 759*fa9e4066Sahrens 760*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 761*fa9e4066Sahrens if (ddi_copyout(&gpt, efi.dki_data, sizeof (gpt), flag) || 762*fa9e4066Sahrens ddi_copyout(&gpe, efi.dki_data + 1, sizeof (gpe), flag)) 763*fa9e4066Sahrens error = EFAULT; 764*fa9e4066Sahrens return (error); 765*fa9e4066Sahrens 766*fa9e4066Sahrens default: 767*fa9e4066Sahrens error = ENOTSUP; 768*fa9e4066Sahrens break; 769*fa9e4066Sahrens 770*fa9e4066Sahrens } 771*fa9e4066Sahrens mutex_exit(&zvol_state_lock); 772*fa9e4066Sahrens return (error); 773*fa9e4066Sahrens } 774*fa9e4066Sahrens 775*fa9e4066Sahrens int 776*fa9e4066Sahrens zvol_busy(void) 777*fa9e4066Sahrens { 778*fa9e4066Sahrens return (zvol_minors != 0); 779*fa9e4066Sahrens } 780*fa9e4066Sahrens 781*fa9e4066Sahrens void 782*fa9e4066Sahrens zvol_init(void) 783*fa9e4066Sahrens { 784*fa9e4066Sahrens VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0); 785*fa9e4066Sahrens mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL); 786*fa9e4066Sahrens } 787*fa9e4066Sahrens 788*fa9e4066Sahrens void 789*fa9e4066Sahrens zvol_fini(void) 790*fa9e4066Sahrens { 791*fa9e4066Sahrens mutex_destroy(&zvol_state_lock); 792*fa9e4066Sahrens ddi_soft_state_fini(&zvol_state); 793*fa9e4066Sahrens } 794