diff options
Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/zvol.c')
| -rw-r--r-- | sys/contrib/opensolaris/uts/common/fs/zfs/zvol.c | 801 |
1 files changed, 0 insertions, 801 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/zvol.c b/sys/contrib/opensolaris/uts/common/fs/zfs/zvol.c deleted file mode 100644 index fedae03..0000000 --- a/sys/contrib/opensolaris/uts/common/fs/zfs/zvol.c +++ /dev/null @@ -1,801 +0,0 @@ -/* - * CDDL HEADER START - * - * The contents of this file are subject to the terms of the - * Common Development and Distribution License (the "License"). - * You may not use this file except in compliance with the License. - * - * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE - * or http://www.opensolaris.org/os/licensing. - * See the License for the specific language governing permissions - * and limitations under the License. - * - * When distributing Covered Code, include this CDDL HEADER in each - * file and include the License file at usr/src/OPENSOLARIS.LICENSE. - * If applicable, add the following below this CDDL HEADER, with the - * fields enclosed by brackets "[]" replaced with your own identifying - * information: Portions Copyright [yyyy] [name of copyright owner] - * - * CDDL HEADER END - */ -/* - * Copyright (c) 2006 Pawel Jakub Dawidek <pjd@FreeBSD.org> - * All rights reserved. - */ -/* - * Copyright 2007 Sun Microsystems, Inc. All rights reserved. - * Use is subject to license terms. - */ - -#pragma ident "%Z%%M% %I% %E% SMI" - -/* - * ZFS volume emulation driver. - * - * Makes a DMU object look like a volume of arbitrary size, up to 2^64 bytes. - * Volumes are accessed through the symbolic links named: - * - * /dev/zvol/dsk/<pool_name>/<dataset_name> - * /dev/zvol/rdsk/<pool_name>/<dataset_name> - * - * These links are created by the ZFS-specific devfsadm link generator. - * Volumes are persistent through reboot. No user command needs to be - * run before opening and using a device. - */ - -#include <sys/types.h> -#include <sys/param.h> -#include <sys/kernel.h> -#include <sys/errno.h> -#include <sys/uio.h> -#include <sys/bio.h> -#include <sys/buf.h> -#include <sys/kmem.h> -#include <sys/conf.h> -#include <sys/cmn_err.h> -#include <sys/stat.h> -#include <sys/zap.h> -#include <sys/spa.h> -#include <sys/zio.h> -#include <sys/dsl_prop.h> -#include <sys/dkio.h> -#include <sys/byteorder.h> -#include <sys/sunddi.h> -#include <sys/dirent.h> -#include <sys/policy.h> -#include <sys/fs/zfs.h> -#include <sys/zfs_ioctl.h> -#include <sys/zil.h> -#include <sys/refcount.h> -#include <sys/zfs_znode.h> -#include <sys/zfs_rlock.h> -#include <geom/geom.h> - -#include "zfs_namecheck.h" - -struct g_class zfs_zvol_class = { - .name = "ZFS::ZVOL", - .version = G_VERSION, -}; - -DECLARE_GEOM_CLASS(zfs_zvol_class, zfs_zvol); - -#define ZVOL_OBJ 1ULL -#define ZVOL_ZAP_OBJ 2ULL - -static uint32_t zvol_minors; - -/* - * The in-core state of each volume. - */ -typedef struct zvol_state { - char zv_name[MAXPATHLEN]; /* pool/dd name */ - uint64_t zv_volsize; /* amount of space we advertise */ - uint64_t zv_volblocksize; /* volume block size */ - struct g_provider *zv_provider; /* GEOM provider */ - uint8_t zv_min_bs; /* minimum addressable block shift */ - uint8_t zv_readonly; /* hard readonly; like write-protect */ - objset_t *zv_objset; /* objset handle */ - uint32_t zv_mode; /* DS_MODE_* flags at open time */ - uint32_t zv_total_opens; /* total open count */ - zilog_t *zv_zilog; /* ZIL handle */ - uint64_t zv_txg_assign; /* txg to assign during ZIL replay */ - znode_t zv_znode; /* for range locking */ - int zv_state; - struct bio_queue_head zv_queue; - struct mtx zv_queue_mtx; /* zv_queue mutex */ -} zvol_state_t; - -/* - * zvol maximum transfer in one DMU tx. - */ -int zvol_maxphys = DMU_MAX_ACCESS/2; - -static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio); - -int -zvol_check_volsize(uint64_t volsize, uint64_t blocksize) -{ - if (volsize == 0) - return (EINVAL); - - if (volsize % blocksize != 0) - return (EINVAL); - -#ifdef _ILP32 - if (volsize - 1 > SPEC_MAXOFFSET_T) - return (EOVERFLOW); -#endif - return (0); -} - -int -zvol_check_volblocksize(uint64_t volblocksize) -{ - if (volblocksize < SPA_MINBLOCKSIZE || - volblocksize > SPA_MAXBLOCKSIZE || - !ISP2(volblocksize)) - return (EDOM); - - return (0); -} - -static void -zvol_readonly_changed_cb(void *arg, uint64_t newval) -{ - zvol_state_t *zv = arg; - - zv->zv_readonly = (uint8_t)newval; -} - -int -zvol_get_stats(objset_t *os, nvlist_t *nv) -{ - int error; - dmu_object_info_t doi; - uint64_t val; - - - error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &val); - if (error) - return (error); - - dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLSIZE, val); - - error = dmu_object_info(os, ZVOL_OBJ, &doi); - - if (error == 0) { - dsl_prop_nvlist_add_uint64(nv, ZFS_PROP_VOLBLOCKSIZE, - doi.doi_data_block_size); - } - - return (error); -} - -static zvol_state_t * -zvol_minor_lookup(const char *name) -{ - struct g_provider *pp; - struct g_geom *gp; - - g_topology_assert(); - - LIST_FOREACH(gp, &zfs_zvol_class.geom, geom) { - LIST_FOREACH(pp, &gp->provider, provider) { - if (strcmp(pp->name + sizeof(ZVOL_DEV_DIR), name) == 0) - return (pp->private); - } - } - - return (NULL); -} - -static int -zvol_access(struct g_provider *pp, int acr, int acw, int ace) -{ - zvol_state_t *zv; - - g_topology_assert(); - - zv = pp->private; - if (zv == NULL) { - if (acr <= 0 && acw <= 0 && ace <= 0) - return (0); - return (pp->error); - } - - ASSERT(zv->zv_objset != NULL); - - if (acw > 0 && (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY))) - return (EROFS); - - zv->zv_total_opens += acr + acw + ace; - - return (0); -} - -/* - * zvol_log_write() handles synchronous writes using TX_WRITE ZIL transactions. - * - * We store data in the log buffers if it's small enough. - * Otherwise we will later flush the data out via dmu_sync(). - */ -ssize_t zvol_immediate_write_sz = 32768; - -static void -zvol_log_write(zvol_state_t *zv, dmu_tx_t *tx, offset_t off, ssize_t len) -{ - uint32_t blocksize = zv->zv_volblocksize; - lr_write_t *lr; - - while (len) { - ssize_t nbytes = MIN(len, blocksize - P2PHASE(off, blocksize)); - itx_t *itx = zil_itx_create(TX_WRITE, sizeof (*lr)); - - itx->itx_wr_state = - len > zvol_immediate_write_sz ? WR_INDIRECT : WR_NEED_COPY; - itx->itx_private = zv; - lr = (lr_write_t *)&itx->itx_lr; - lr->lr_foid = ZVOL_OBJ; - lr->lr_offset = off; - lr->lr_length = nbytes; - lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t); - BP_ZERO(&lr->lr_blkptr); - - (void) zil_itx_assign(zv->zv_zilog, itx, tx); - len -= nbytes; - off += nbytes; - } -} - -static void -zvol_start(struct bio *bp) -{ - zvol_state_t *zv; - - switch (bp->bio_cmd) { - case BIO_READ: - case BIO_WRITE: - case BIO_FLUSH: - zv = bp->bio_to->private; - ASSERT(zv != NULL); - mtx_lock(&zv->zv_queue_mtx); - bioq_insert_tail(&zv->zv_queue, bp); - wakeup_one(&zv->zv_queue); - mtx_unlock(&zv->zv_queue_mtx); - break; - case BIO_DELETE: - case BIO_GETATTR: - default: - g_io_deliver(bp, EOPNOTSUPP); - break; - } -} - -static void -zvol_serve_one(zvol_state_t *zv, struct bio *bp) -{ - uint64_t off, volsize; - size_t size, resid; - char *addr; - objset_t *os; - rl_t *rl; - int error = 0; - boolean_t reading; - - off = bp->bio_offset; - volsize = zv->zv_volsize; - - os = zv->zv_objset; - ASSERT(os != NULL); - - addr = bp->bio_data; - resid = bp->bio_length; - - error = 0; - - /* - * There must be no buffer changes when doing a dmu_sync() because - * we can't change the data whilst calculating the checksum. - * A better approach than a per zvol rwlock would be to lock ranges. - */ - reading = (bp->bio_cmd == BIO_READ); - rl = zfs_range_lock(&zv->zv_znode, off, resid, - reading ? RL_READER : RL_WRITER); - - while (resid != 0 && off < volsize) { - - size = MIN(resid, zvol_maxphys); /* zvol_maxphys per tx */ - - if (size > volsize - off) /* don't write past the end */ - size = volsize - off; - - if (reading) { - error = dmu_read(os, ZVOL_OBJ, off, size, addr); - } else { - dmu_tx_t *tx = dmu_tx_create(os); - dmu_tx_hold_write(tx, ZVOL_OBJ, off, size); - error = dmu_tx_assign(tx, TXG_WAIT); - if (error) { - dmu_tx_abort(tx); - } else { - dmu_write(os, ZVOL_OBJ, off, size, addr, tx); - zvol_log_write(zv, tx, off, size); - dmu_tx_commit(tx); - } - } - if (error) - break; - off += size; - addr += size; - resid -= size; - } - zfs_range_unlock(rl); - - bp->bio_completed = bp->bio_length - resid; - if (bp->bio_completed < bp->bio_length) - bp->bio_error = (off > volsize ? EINVAL : error); -} - -static void -zvol_worker(void *arg) -{ - zvol_state_t *zv; - struct bio *bp; - - zv = arg; - for (;;) { - mtx_lock(&zv->zv_queue_mtx); - bp = bioq_takefirst(&zv->zv_queue); - if (bp == NULL) { - if (zv->zv_state == 1) { - zv->zv_state = 2; - wakeup(&zv->zv_state); - mtx_unlock(&zv->zv_queue_mtx); - kproc_exit(0); - } - msleep(&zv->zv_queue, &zv->zv_queue_mtx, PRIBIO | PDROP, - "zvol:io", 0); - continue; - } - mtx_unlock(&zv->zv_queue_mtx); - switch (bp->bio_cmd) { - case BIO_FLUSH: - break; - case BIO_READ: - case BIO_WRITE: - zvol_serve_one(zv, bp); - break; - } - - if (bp->bio_cmd != BIO_READ && !zil_disable) - zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ); - - g_io_deliver(bp, bp->bio_error); - } -} - -void -zvol_create_cb(objset_t *os, void *arg, dmu_tx_t *tx) -{ - zfs_create_data_t *zc = arg; - int error; - uint64_t volblocksize, volsize; - - VERIFY(nvlist_lookup_uint64(zc->zc_props, - zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0); - if (nvlist_lookup_uint64(zc->zc_props, - zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0) - volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE); - - /* - * These properites must be removed from the list so the generic - * property setting step won't apply to them. - */ - VERIFY(nvlist_remove_all(zc->zc_props, - zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0); - (void) nvlist_remove_all(zc->zc_props, - zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE)); - - error = dmu_object_claim(os, ZVOL_OBJ, DMU_OT_ZVOL, volblocksize, - DMU_OT_NONE, 0, tx); - ASSERT(error == 0); - - error = zap_create_claim(os, ZVOL_ZAP_OBJ, DMU_OT_ZVOL_PROP, - DMU_OT_NONE, 0, tx); - ASSERT(error == 0); - - error = zap_update(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize, tx); - ASSERT(error == 0); -} - -/* - * Replay a TX_WRITE ZIL transaction that didn't get committed - * after a system failure - */ -static int -zvol_replay_write(zvol_state_t *zv, lr_write_t *lr, boolean_t byteswap) -{ - objset_t *os = zv->zv_objset; - char *data = (char *)(lr + 1); /* data follows lr_write_t */ - uint64_t off = lr->lr_offset; - uint64_t len = lr->lr_length; - dmu_tx_t *tx; - int error; - - if (byteswap) - byteswap_uint64_array(lr, sizeof (*lr)); - - tx = dmu_tx_create(os); - dmu_tx_hold_write(tx, ZVOL_OBJ, off, len); - error = dmu_tx_assign(tx, zv->zv_txg_assign); - if (error) { - dmu_tx_abort(tx); - } else { - dmu_write(os, ZVOL_OBJ, off, len, data, tx); - dmu_tx_commit(tx); - } - - return (error); -} - -/* ARGSUSED */ -static int -zvol_replay_err(zvol_state_t *zv, lr_t *lr, boolean_t byteswap) -{ - return (ENOTSUP); -} - -/* - * Callback vectors for replaying records. - * Only TX_WRITE is needed for zvol. - */ -zil_replay_func_t *zvol_replay_vector[TX_MAX_TYPE] = { - zvol_replay_err, /* 0 no such transaction type */ - zvol_replay_err, /* TX_CREATE */ - zvol_replay_err, /* TX_MKDIR */ - zvol_replay_err, /* TX_MKXATTR */ - zvol_replay_err, /* TX_SYMLINK */ - zvol_replay_err, /* TX_REMOVE */ - zvol_replay_err, /* TX_RMDIR */ - zvol_replay_err, /* TX_LINK */ - zvol_replay_err, /* TX_RENAME */ - zvol_replay_write, /* TX_WRITE */ - zvol_replay_err, /* TX_TRUNCATE */ - zvol_replay_err, /* TX_SETATTR */ - zvol_replay_err, /* TX_ACL */ -}; - -/* - * Create a minor node for the specified volume. - */ -int -zvol_create_minor(const char *name, dev_t dev) -{ - struct g_provider *pp; - struct g_geom *gp; - zvol_state_t *zv; - objset_t *os; - dmu_object_info_t doi; - uint64_t volsize; - int ds_mode = DS_MODE_PRIMARY; - int error; - - DROP_GIANT(); - g_topology_lock(); - - if ((zv = zvol_minor_lookup(name)) != NULL) { - error = EEXIST; - goto end; - } - - if (strchr(name, '@') != 0) - ds_mode |= DS_MODE_READONLY; - - error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os); - if (error) - goto end; - - g_topology_unlock(); - PICKUP_GIANT(); - error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize); - DROP_GIANT(); - g_topology_lock(); - if (error) { - dmu_objset_close(os); - goto end; - } - - gp = g_new_geomf(&zfs_zvol_class, "zfs::zvol::%s", name); - gp->start = zvol_start; - gp->access = zvol_access; - pp = g_new_providerf(gp, "%s/%s", ZVOL_DEV_DIR, name); - pp->mediasize = volsize; - pp->sectorsize = DEV_BSIZE; - - zv = kmem_zalloc(sizeof(*zv), KM_SLEEP); - (void) strcpy(zv->zv_name, name); - zv->zv_min_bs = DEV_BSHIFT; - zv->zv_provider = pp; - zv->zv_volsize = pp->mediasize; - zv->zv_objset = os; - zv->zv_mode = ds_mode; - zv->zv_zilog = zil_open(os, zvol_get_data); - mutex_init(&zv->zv_znode.z_range_lock, NULL, MUTEX_DEFAULT, NULL); - avl_create(&zv->zv_znode.z_range_avl, zfs_range_compare, - sizeof (rl_t), offsetof(rl_t, r_node)); - - - /* get and cache the blocksize */ - error = dmu_object_info(os, ZVOL_OBJ, &doi); - ASSERT(error == 0); - zv->zv_volblocksize = doi.doi_data_block_size; - - zil_replay(os, zv, &zv->zv_txg_assign, zvol_replay_vector); - - /* XXX this should handle the possible i/o error */ - VERIFY(dsl_prop_register(dmu_objset_ds(zv->zv_objset), - "readonly", zvol_readonly_changed_cb, zv) == 0); - - pp->private = zv; - g_error_provider(pp, 0); - - bioq_init(&zv->zv_queue); - mtx_init(&zv->zv_queue_mtx, "zvol", NULL, MTX_DEF); - zv->zv_state = 0; - kproc_create(zvol_worker, zv, NULL, 0, 0, "zvol:worker %s", pp->name); - - zvol_minors++; -end: - g_topology_unlock(); - PICKUP_GIANT(); - - return (error); -} - -/* - * Remove minor node for the specified volume. - */ -int -zvol_remove_minor(const char *name) -{ - struct g_provider *pp; - zvol_state_t *zv; - int error = 0; - - DROP_GIANT(); - g_topology_lock(); - - if ((zv = zvol_minor_lookup(name)) == NULL) { - error = ENXIO; - goto end; - } - - if (zv->zv_total_opens != 0) { - error = EBUSY; - goto end; - } - - VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset), - "readonly", zvol_readonly_changed_cb, zv) == 0); - - mtx_lock(&zv->zv_queue_mtx); - zv->zv_state = 1; - wakeup_one(&zv->zv_queue); - while (zv->zv_state != 2) - msleep(&zv->zv_state, &zv->zv_queue_mtx, 0, "zvol:w", 0); - mtx_unlock(&zv->zv_queue_mtx); - mtx_destroy(&zv->zv_queue_mtx); - - pp = zv->zv_provider; - pp->private = NULL; - g_wither_geom(pp->geom, ENXIO); - - zil_close(zv->zv_zilog); - zv->zv_zilog = NULL; - dmu_objset_close(zv->zv_objset); - zv->zv_objset = NULL; - avl_destroy(&zv->zv_znode.z_range_avl); - mutex_destroy(&zv->zv_znode.z_range_lock); - - kmem_free(zv, sizeof(*zv)); - - zvol_minors--; -end: - g_topology_unlock(); - PICKUP_GIANT(); - - return (error); -} - -int -zvol_set_volsize(const char *name, dev_t dev, uint64_t volsize) -{ - zvol_state_t *zv; - dmu_tx_t *tx; - int error; - dmu_object_info_t doi; - - DROP_GIANT(); - g_topology_lock(); - - if ((zv = zvol_minor_lookup(name)) == NULL) { - error = ENXIO; - goto end; - } - - if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 || - (error = zvol_check_volsize(volsize, - doi.doi_data_block_size)) != 0) { - goto end; - } - - if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { - error = EROFS; - goto end; - } - - tx = dmu_tx_create(zv->zv_objset); - dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL); - dmu_tx_hold_free(tx, ZVOL_OBJ, volsize, DMU_OBJECT_END); - error = dmu_tx_assign(tx, TXG_WAIT); - if (error) { - dmu_tx_abort(tx); - goto end; - } - - error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1, - &volsize, tx); - if (error == 0) { - error = dmu_free_range(zv->zv_objset, ZVOL_OBJ, volsize, - DMU_OBJECT_END, tx); - } - - dmu_tx_commit(tx); - - if (error == 0) { - zv->zv_volsize = volsize; - zv->zv_provider->mediasize = volsize; /* XXX: Not supported. */ - } -end: - g_topology_unlock(); - PICKUP_GIANT(); - - return (error); -} - -int -zvol_set_volblocksize(const char *name, uint64_t volblocksize) -{ - zvol_state_t *zv; - dmu_tx_t *tx; - int error; - - DROP_GIANT(); - g_topology_lock(); - - if ((zv = zvol_minor_lookup(name)) == NULL) { - error = ENXIO; - goto end; - } - - if (zv->zv_readonly || (zv->zv_mode & DS_MODE_READONLY)) { - error = EROFS; - goto end; - } - - tx = dmu_tx_create(zv->zv_objset); - dmu_tx_hold_bonus(tx, ZVOL_OBJ); - error = dmu_tx_assign(tx, TXG_WAIT); - if (error) { - dmu_tx_abort(tx); - } else { - error = dmu_object_set_blocksize(zv->zv_objset, ZVOL_OBJ, - volblocksize, 0, tx); - if (error == ENOTSUP) - error = EBUSY; - dmu_tx_commit(tx); - /* XXX: Not supported. */ -#if 0 - if (error == 0) - zv->zv_provider->sectorsize = zc->zc_volblocksize; -#endif - } -end: - g_topology_unlock(); - PICKUP_GIANT(); - - return (error); -} - -void -zvol_get_done(dmu_buf_t *db, void *vzgd) -{ - zgd_t *zgd = (zgd_t *)vzgd; - rl_t *rl = zgd->zgd_rl; - - dmu_buf_rele(db, vzgd); - zfs_range_unlock(rl); - zil_add_vdev(zgd->zgd_zilog, DVA_GET_VDEV(BP_IDENTITY(zgd->zgd_bp))); - kmem_free(zgd, sizeof (zgd_t)); -} - -/* - * Get data to generate a TX_WRITE intent log record. - */ -static int -zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio) -{ - zvol_state_t *zv = arg; - objset_t *os = zv->zv_objset; - dmu_buf_t *db; - rl_t *rl; - zgd_t *zgd; - uint64_t boff; /* block starting offset */ - int dlen = lr->lr_length; /* length of user data */ - int error; - - ASSERT(zio); - ASSERT(dlen != 0); - - /* - * Write records come in two flavors: immediate and indirect. - * For small writes it's cheaper to store the data with the - * log record (immediate); for large writes it's cheaper to - * sync the data and get a pointer to it (indirect) so that - * we don't have to write the data twice. - */ - if (buf != NULL) /* immediate write */ - return (dmu_read(os, ZVOL_OBJ, lr->lr_offset, dlen, buf)); - - zgd = (zgd_t *)kmem_alloc(sizeof (zgd_t), KM_SLEEP); - zgd->zgd_zilog = zv->zv_zilog; - zgd->zgd_bp = &lr->lr_blkptr; - - /* - * Lock the range of the block to ensure that when the data is - * written out and it's checksum is being calculated that no other - * thread can change the block. - */ - boff = P2ALIGN_TYPED(lr->lr_offset, zv->zv_volblocksize, uint64_t); - rl = zfs_range_lock(&zv->zv_znode, boff, zv->zv_volblocksize, - RL_READER); - zgd->zgd_rl = rl; - - VERIFY(0 == dmu_buf_hold(os, ZVOL_OBJ, lr->lr_offset, zgd, &db)); - error = dmu_sync(zio, db, &lr->lr_blkptr, - lr->lr_common.lrc_txg, zvol_get_done, zgd); - if (error == 0) - zil_add_vdev(zv->zv_zilog, - DVA_GET_VDEV(BP_IDENTITY(&lr->lr_blkptr))); - /* - * If we get EINPROGRESS, then we need to wait for a - * write IO initiated by dmu_sync() to complete before - * we can release this dbuf. We will finish everything - * up in the zvol_get_done() callback. - */ - if (error == EINPROGRESS) - return (0); - dmu_buf_rele(db, zgd); - zfs_range_unlock(rl); - kmem_free(zgd, sizeof (zgd_t)); - return (error); -} - -int -zvol_busy(void) -{ - return (zvol_minors != 0); -} - -void -zvol_init(void) -{ - ZFS_LOG(1, "ZVOL Initialized."); -} - -void -zvol_fini(void) -{ - ZFS_LOG(1, "ZVOL Deinitialized."); -} |
