Merge branch 'gcc-c90' into refs/top-bases/gcc-branch

1 files changed, 0 insertions, 1835 deletions

diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
deleted file mode 100644
index cfd3b3dbd..000000000
--- a/module/zfs/zvol.c
+++ /dev/null
@@ -1,1835 +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 2009 Sun Microsystems, Inc.  All rights reserved.
- * Use is subject to license terms.
- */
-
-/*
- * 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/errno.h>
-#include <sys/uio.h>
-#include <sys/buf.h>
-#include <sys/modctl.h>
-#include <sys/open.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/dmu_traverse.h>
-#include <sys/dnode.h>
-#include <sys/dsl_dataset.h>
-#include <sys/dsl_prop.h>
-#include <sys/dkio.h>
-#include <sys/efi_partition.h>
-#include <sys/byteorder.h>
-#include <sys/pathname.h>
-#include <sys/ddi.h>
-#include <sys/sunddi.h>
-#include <sys/crc32.h>
-#include <sys/dirent.h>
-#include <sys/policy.h>
-#include <sys/fs/zfs.h>
-#include <sys/zfs_ioctl.h>
-#include <sys/mkdev.h>
-#include <sys/zil.h>
-#include <sys/refcount.h>
-#include <sys/zfs_znode.h>
-#include <sys/zfs_rlock.h>
-#include <sys/vdev_disk.h>
-#include <sys/vdev_impl.h>
-#include <sys/zvol.h>
-#include <sys/dumphdr.h>
-#include <sys/zil_impl.h>
-
-#include "zfs_namecheck.h"
-
-static void *zvol_state;
-
-#define	ZVOL_DUMPSIZE		"dumpsize"
-
-/*
- * This lock protects the zvol_state structure from being modified
- * while it's being used, e.g. an open that comes in before a create
- * finishes.  It also protects temporary opens of the dataset so that,
- * e.g., an open doesn't get a spurious EBUSY.
- */
-static kmutex_t zvol_state_lock;
-static uint32_t zvol_minors;
-
-typedef struct zvol_extent {
-	list_node_t	ze_node;
-	dva_t		ze_dva;		/* dva associated with this extent */
-	uint64_t	ze_nblks;	/* number of blocks in extent */
-} zvol_extent_t;
-
-/*
- * 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 */
-	minor_t		zv_minor;	/* minor number */
-	uint8_t		zv_min_bs;	/* minimum addressable block shift */
-	uint8_t		zv_flags;	/* readonly, dumpified, etc. */
-	objset_t	*zv_objset;	/* objset handle */
-	uint32_t	zv_mode;	/* DS_MODE_* flags at open time */
-	uint32_t	zv_open_count[OTYPCNT];	/* open counts */
-	uint32_t	zv_total_opens;	/* total open count */
-	zilog_t		*zv_zilog;	/* ZIL handle */
-	list_t		zv_extents;	/* List of extents for dump */
-	znode_t		zv_znode;	/* for range locking */
-} zvol_state_t;
-
-/*
- * zvol specific flags
- */
-#define	ZVOL_RDONLY	0x1
-#define	ZVOL_DUMPIFIED	0x2
-#define	ZVOL_EXCL	0x4
-#define	ZVOL_WCE	0x8
-
-/*
- * zvol maximum transfer in one DMU tx.
- */
-int zvol_maxphys = DMU_MAX_ACCESS/2;
-
-extern int zfs_set_prop_nvlist(const char *, nvlist_t *);
-static int zvol_get_data(void *arg, lr_write_t *lr, char *buf, zio_t *zio);
-static int zvol_dumpify(zvol_state_t *zv);
-static int zvol_dump_fini(zvol_state_t *zv);
-static int zvol_dump_init(zvol_state_t *zv, boolean_t resize);
-
-static void
-zvol_size_changed(zvol_state_t *zv, major_t maj)
-{
-	dev_t dev = makedevice(maj, zv->zv_minor);
-
-	VERIFY(ddi_prop_update_int64(dev, zfs_dip,
-	    "Size", zv->zv_volsize) == DDI_SUCCESS);
-	VERIFY(ddi_prop_update_int64(dev, zfs_dip,
-	    "Nblocks", lbtodb(zv->zv_volsize)) == DDI_SUCCESS);
-
-	/* Notify specfs to invalidate the cached size */
-	spec_size_invalidate(dev, VBLK);
-	spec_size_invalidate(dev, VCHR);
-}
-
-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;
-
-	if (newval)
-		zv->zv_flags |= ZVOL_RDONLY;
-	else
-		zv->zv_flags &= ~ZVOL_RDONLY;
-}
-
-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);
-}
-
-/*
- * Find a free minor number.
- */
-static minor_t
-zvol_minor_alloc(void)
-{
-	minor_t minor;
-
-	ASSERT(MUTEX_HELD(&zvol_state_lock));
-
-	for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++)
-		if (ddi_get_soft_state(zvol_state, minor) == NULL)
-			return (minor);
-
-	return (0);
-}
-
-static zvol_state_t *
-zvol_minor_lookup(const char *name)
-{
-	minor_t minor;
-	zvol_state_t *zv;
-
-	ASSERT(MUTEX_HELD(&zvol_state_lock));
-
-	for (minor = 1; minor <= ZVOL_MAX_MINOR; minor++) {
-		zv = ddi_get_soft_state(zvol_state, minor);
-		if (zv == NULL)
-			continue;
-		if (strcmp(zv->zv_name, name) == 0)
-			break;
-	}
-
-	return (zv);
-}
-
-/* extent mapping arg */
-struct maparg {
-	zvol_state_t	*ma_zv;
-	uint64_t	ma_blks;
-};
-
-/*ARGSUSED*/
-static int
-zvol_map_block(spa_t *spa, blkptr_t *bp, const zbookmark_t *zb,
-    const dnode_phys_t *dnp, void *arg)
-{
-	struct maparg *ma = arg;
-	zvol_extent_t *ze;
-	int bs = ma->ma_zv->zv_volblocksize;
-
-	if (bp == NULL || zb->zb_object != ZVOL_OBJ || zb->zb_level != 0)
-		return (0);
-
-	VERIFY3U(ma->ma_blks, ==, zb->zb_blkid);
-	ma->ma_blks++;
-
-	/* Abort immediately if we have encountered gang blocks */
-	if (BP_IS_GANG(bp))
-		return (EFRAGS);
-
-	/*
-	 * See if the block is at the end of the previous extent.
-	 */
-	ze = list_tail(&ma->ma_zv->zv_extents);
-	if (ze &&
-	    DVA_GET_VDEV(BP_IDENTITY(bp)) == DVA_GET_VDEV(&ze->ze_dva) &&
-	    DVA_GET_OFFSET(BP_IDENTITY(bp)) ==
-	    DVA_GET_OFFSET(&ze->ze_dva) + ze->ze_nblks * bs) {
-		ze->ze_nblks++;
-		return (0);
-	}
-
-	dprintf_bp(bp, "%s", "next blkptr:");
-
-	/* start a new extent */
-	ze = kmem_zalloc(sizeof (zvol_extent_t), KM_SLEEP);
-	ze->ze_dva = bp->blk_dva[0];	/* structure assignment */
-	ze->ze_nblks = 1;
-	list_insert_tail(&ma->ma_zv->zv_extents, ze);
-	return (0);
-}
-
-static void
-zvol_free_extents(zvol_state_t *zv)
-{
-	zvol_extent_t *ze;
-
-	while (ze = list_head(&zv->zv_extents)) {
-		list_remove(&zv->zv_extents, ze);
-		kmem_free(ze, sizeof (zvol_extent_t));
-	}
-}
-
-static int
-zvol_get_lbas(zvol_state_t *zv)
-{
-	struct maparg	ma;
-	int		err;
-
-	ma.ma_zv = zv;
-	ma.ma_blks = 0;
-	zvol_free_extents(zv);
-
-	err = traverse_dataset(dmu_objset_ds(zv->zv_objset), 0,
-	    TRAVERSE_PRE | TRAVERSE_PREFETCH_METADATA, zvol_map_block, &ma);
-	if (err || ma.ma_blks != (zv->zv_volsize / zv->zv_volblocksize)) {
-		zvol_free_extents(zv);
-		return (err ? err : EIO);
-	}
-
-	return (0);
-}
-
-/* ARGSUSED */
-void
-zvol_create_cb(objset_t *os, void *arg, cred_t *cr, dmu_tx_t *tx)
-{
-	zfs_creat_t *zct = arg;
-	nvlist_t *nvprops = zct->zct_props;
-	int error;
-	uint64_t volblocksize, volsize;
-
-	VERIFY(nvlist_lookup_uint64(nvprops,
-	    zfs_prop_to_name(ZFS_PROP_VOLSIZE), &volsize) == 0);
-	if (nvlist_lookup_uint64(nvprops,
-	    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &volblocksize) != 0)
-		volblocksize = zfs_prop_default_numeric(ZFS_PROP_VOLBLOCKSIZE);
-
-	/*
-	 * These properties must be removed from the list so the generic
-	 * property setting step won't apply to them.
-	 */
-	VERIFY(nvlist_remove_all(nvprops,
-	    zfs_prop_to_name(ZFS_PROP_VOLSIZE)) == 0);
-	(void) nvlist_remove_all(nvprops,
-	    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, TXG_WAIT);
-	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 (plus a whole lot more) for the specified volume.
- */
-int
-zvol_create_minor(const char *name, major_t maj)
-{
-	zvol_state_t *zv;
-	objset_t *os;
-	dmu_object_info_t doi;
-	uint64_t volsize;
-	minor_t minor = 0;
-	struct pathname linkpath;
-	int ds_mode = DS_MODE_OWNER;
-	vnode_t *vp = NULL;
-	char *devpath;
-	size_t devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(name) + 1;
-	char chrbuf[30], blkbuf[30];
-	int error;
-
-	mutex_enter(&zvol_state_lock);
-
-	if ((zv = zvol_minor_lookup(name)) != NULL) {
-		mutex_exit(&zvol_state_lock);
-		return (EEXIST);
-	}
-
-	if (strchr(name, '@') != 0)
-		ds_mode |= DS_MODE_READONLY;
-
-	error = dmu_objset_open(name, DMU_OST_ZVOL, ds_mode, &os);
-
-	if (error) {
-		mutex_exit(&zvol_state_lock);
-		return (error);
-	}
-
-	error = zap_lookup(os, ZVOL_ZAP_OBJ, "size", 8, 1, &volsize);
-
-	if (error) {
-		dmu_objset_close(os);
-		mutex_exit(&zvol_state_lock);
-		return (error);
-	}
-
-	/*
-	 * If there's an existing /dev/zvol symlink, try to use the
-	 * same minor number we used last time.
-	 */
-	devpath = kmem_alloc(devpathlen, KM_SLEEP);
-
-	(void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, name);
-
-	error = lookupname(devpath, UIO_SYSSPACE, NO_FOLLOW, NULL, &vp);
-
-	kmem_free(devpath, devpathlen);
-
-	if (error == 0 && vp->v_type != VLNK)
-		error = EINVAL;
-
-	if (error == 0) {
-		pn_alloc(&linkpath);
-		error = pn_getsymlink(vp, &linkpath, kcred);
-		if (error == 0) {
-			char *ms = strstr(linkpath.pn_path, ZVOL_PSEUDO_DEV);
-			if (ms != NULL) {
-				ms += strlen(ZVOL_PSEUDO_DEV);
-				minor = stoi(&ms);
-			}
-		}
-		pn_free(&linkpath);
-	}
-
-	if (vp != NULL)
-		VN_RELE(vp);
-
-	/*
-	 * If we found a minor but it's already in use, we must pick a new one.
-	 */
-	if (minor != 0 && ddi_get_soft_state(zvol_state, minor) != NULL)
-		minor = 0;
-
-	if (minor == 0)
-		minor = zvol_minor_alloc();
-
-	if (minor == 0) {
-		dmu_objset_close(os);
-		mutex_exit(&zvol_state_lock);
-		return (ENXIO);
-	}
-
-	if (ddi_soft_state_zalloc(zvol_state, minor) != DDI_SUCCESS) {
-		dmu_objset_close(os);
-		mutex_exit(&zvol_state_lock);
-		return (EAGAIN);
-	}
-
-	(void) ddi_prop_update_string(minor, zfs_dip, ZVOL_PROP_NAME,
-	    (char *)name);
-
-	(void) sprintf(chrbuf, "%uc,raw", minor);
-
-	if (ddi_create_minor_node(zfs_dip, chrbuf, S_IFCHR,
-	    minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
-		ddi_soft_state_free(zvol_state, minor);
-		dmu_objset_close(os);
-		mutex_exit(&zvol_state_lock);
-		return (EAGAIN);
-	}
-
-	(void) sprintf(blkbuf, "%uc", minor);
-
-	if (ddi_create_minor_node(zfs_dip, blkbuf, S_IFBLK,
-	    minor, DDI_PSEUDO, 0) == DDI_FAILURE) {
-		ddi_remove_minor_node(zfs_dip, chrbuf);
-		ddi_soft_state_free(zvol_state, minor);
-		dmu_objset_close(os);
-		mutex_exit(&zvol_state_lock);
-		return (EAGAIN);
-	}
-
-	zv = ddi_get_soft_state(zvol_state, minor);
-
-	(void) strcpy(zv->zv_name, name);
-	zv->zv_min_bs = DEV_BSHIFT;
-	zv->zv_minor = minor;
-	zv->zv_volsize = volsize;
-	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));
-	list_create(&zv->zv_extents, sizeof (zvol_extent_t),
-	    offsetof(zvol_extent_t, ze_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, zvol_replay_vector);
-	zvol_size_changed(zv, maj);
-
-	/* 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);
-
-	zvol_minors++;
-
-	mutex_exit(&zvol_state_lock);
-
-	return (0);
-}
-
-/*
- * Remove minor node for the specified volume.
- */
-int
-zvol_remove_minor(const char *name)
-{
-	zvol_state_t *zv;
-	char namebuf[30];
-
-	mutex_enter(&zvol_state_lock);
-
-	if ((zv = zvol_minor_lookup(name)) == NULL) {
-		mutex_exit(&zvol_state_lock);
-		return (ENXIO);
-	}
-
-	if (zv->zv_total_opens != 0) {
-		mutex_exit(&zvol_state_lock);
-		return (EBUSY);
-	}
-
-	(void) sprintf(namebuf, "%uc,raw", zv->zv_minor);
-	ddi_remove_minor_node(zfs_dip, namebuf);
-
-	(void) sprintf(namebuf, "%uc", zv->zv_minor);
-	ddi_remove_minor_node(zfs_dip, namebuf);
-
-	VERIFY(dsl_prop_unregister(dmu_objset_ds(zv->zv_objset),
-	    "readonly", zvol_readonly_changed_cb, zv) == 0);
-
-	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);
-
-	ddi_soft_state_free(zvol_state, zv->zv_minor);
-
-	zvol_minors--;
-
-	mutex_exit(&zvol_state_lock);
-
-	return (0);
-}
-
-int
-zvol_prealloc(zvol_state_t *zv)
-{
-	objset_t *os = zv->zv_objset;
-	dmu_tx_t *tx;
-	uint64_t refd, avail, usedobjs, availobjs;
-	uint64_t resid = zv->zv_volsize;
-	uint64_t off = 0;
-
-	/* Check the space usage before attempting to allocate the space */
-	dmu_objset_space(os, &refd, &avail, &usedobjs, &availobjs);
-	if (avail < zv->zv_volsize)
-		return (ENOSPC);
-
-	/* Free old extents if they exist */
-	zvol_free_extents(zv);
-
-	while (resid != 0) {
-		int error;
-		uint64_t bytes = MIN(resid, SPA_MAXBLOCKSIZE);
-
-		tx = dmu_tx_create(os);
-		dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
-		error = dmu_tx_assign(tx, TXG_WAIT);
-		if (error) {
-			dmu_tx_abort(tx);
-			(void) dmu_free_long_range(os, ZVOL_OBJ, 0, off);
-			return (error);
-		}
-		dmu_prealloc(os, ZVOL_OBJ, off, bytes, tx);
-		dmu_tx_commit(tx);
-		off += bytes;
-		resid -= bytes;
-	}
-	txg_wait_synced(dmu_objset_pool(os), 0);
-
-	return (0);
-}
-
-int
-zvol_update_volsize(zvol_state_t *zv, major_t maj, uint64_t volsize)
-{
-	dmu_tx_t *tx;
-	int error;
-
-	ASSERT(MUTEX_HELD(&zvol_state_lock));
-
-	tx = dmu_tx_create(zv->zv_objset);
-	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
-	error = dmu_tx_assign(tx, TXG_WAIT);
-	if (error) {
-		dmu_tx_abort(tx);
-		return (error);
-	}
-
-	error = zap_update(zv->zv_objset, ZVOL_ZAP_OBJ, "size", 8, 1,
-	    &volsize, tx);
-	dmu_tx_commit(tx);
-
-	if (error == 0)
-		error = dmu_free_long_range(zv->zv_objset,
-		    ZVOL_OBJ, volsize, DMU_OBJECT_END);
-
-	/*
-	 * If we are using a faked-up state (zv_minor == 0) then don't
-	 * try to update the in-core zvol state.
-	 */
-	if (error == 0 && zv->zv_minor) {
-		zv->zv_volsize = volsize;
-		zvol_size_changed(zv, maj);
-	}
-	return (error);
-}
-
-int
-zvol_set_volsize(const char *name, major_t maj, uint64_t volsize)
-{
-	zvol_state_t *zv;
-	int error;
-	dmu_object_info_t doi;
-	uint64_t old_volsize = 0ULL;
-	zvol_state_t state = { 0 };
-
-	mutex_enter(&zvol_state_lock);
-
-	if ((zv = zvol_minor_lookup(name)) == NULL) {
-		/*
-		 * If we are doing a "zfs clone -o volsize=", then the
-		 * minor node won't exist yet.
-		 */
-		error = dmu_objset_open(name, DMU_OST_ZVOL, DS_MODE_OWNER,
-		    &state.zv_objset);
-		if (error != 0)
-			goto out;
-		zv = &state;
-	}
-	old_volsize = zv->zv_volsize;
-
-	if ((error = dmu_object_info(zv->zv_objset, ZVOL_OBJ, &doi)) != 0 ||
-	    (error = zvol_check_volsize(volsize,
-	    doi.doi_data_block_size)) != 0)
-		goto out;
-
-	if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
-		error = EROFS;
-		goto out;
-	}
-
-	error = zvol_update_volsize(zv, maj, volsize);
-
-	/*
-	 * Reinitialize the dump area to the new size. If we
-	 * failed to resize the dump area then restore the it back to
-	 * it's original size.
-	 */
-	if (error == 0 && zv->zv_flags & ZVOL_DUMPIFIED) {
-		if ((error = zvol_dumpify(zv)) != 0 ||
-		    (error = dumpvp_resize()) != 0) {
-			(void) zvol_update_volsize(zv, maj, old_volsize);
-			error = zvol_dumpify(zv);
-		}
-	}
-
-	/*
-	 * Generate a LUN expansion event.
-	 */
-	if (error == 0) {
-		sysevent_id_t eid;
-		nvlist_t *attr;
-		char *physpath = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
-
-		(void) snprintf(physpath, MAXPATHLEN, "%s%uc", ZVOL_PSEUDO_DEV,
-		    zv->zv_minor);
-
-		VERIFY(nvlist_alloc(&attr, NV_UNIQUE_NAME, KM_SLEEP) == 0);
-		VERIFY(nvlist_add_string(attr, DEV_PHYS_PATH, physpath) == 0);
-
-		(void) ddi_log_sysevent(zfs_dip, SUNW_VENDOR, EC_DEV_STATUS,
-		    ESC_DEV_DLE, attr, &eid, DDI_SLEEP);
-
-		nvlist_free(attr);
-		kmem_free(physpath, MAXPATHLEN);
-	}
-
-out:
-	if (state.zv_objset)
-		dmu_objset_close(state.zv_objset);
-
-	mutex_exit(&zvol_state_lock);
-
-	return (error);
-}
-
-int
-zvol_set_volblocksize(const char *name, uint64_t volblocksize)
-{
-	zvol_state_t *zv;
-	dmu_tx_t *tx;
-	int error;
-	boolean_t needlock;
-
-	/*
-	 * The lock may already be held if we are being called from
-	 * zvol_dump_init().
-	 */
-	needlock = !MUTEX_HELD(&zvol_state_lock);
-	if (needlock)
-		mutex_enter(&zvol_state_lock);
-
-	if ((zv = zvol_minor_lookup(name)) == NULL) {
-		if (needlock)
-			mutex_exit(&zvol_state_lock);
-		return (ENXIO);
-	}
-	if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY)) {
-		if (needlock)
-			mutex_exit(&zvol_state_lock);
-		return (EROFS);
-	}
-
-	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);
-		if (error == 0)
-			zv->zv_volblocksize = volblocksize;
-	}
-
-	if (needlock)
-		mutex_exit(&zvol_state_lock);
-
-	return (error);
-}
-
-/*ARGSUSED*/
-int
-zvol_open(dev_t *devp, int flag, int otyp, cred_t *cr)
-{
-	minor_t minor = getminor(*devp);
-	zvol_state_t *zv;
-
-	if (minor == 0)			/* This is the control device */
-		return (0);
-
-	mutex_enter(&zvol_state_lock);
-
-	zv = ddi_get_soft_state(zvol_state, minor);
-	if (zv == NULL) {
-		mutex_exit(&zvol_state_lock);
-		return (ENXIO);
-	}
-
-	ASSERT(zv->zv_objset != NULL);
-
-	if ((flag & FWRITE) &&
-	    (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))) {
-		mutex_exit(&zvol_state_lock);
-		return (EROFS);
-	}
-	if (zv->zv_flags & ZVOL_EXCL) {
-		mutex_exit(&zvol_state_lock);
-		return (EBUSY);
-	}
-	if (flag & FEXCL) {
-		if (zv->zv_total_opens != 0) {
-			mutex_exit(&zvol_state_lock);
-			return (EBUSY);
-		}
-		zv->zv_flags |= ZVOL_EXCL;
-	}
-
-	if (zv->zv_open_count[otyp] == 0 || otyp == OTYP_LYR) {
-		zv->zv_open_count[otyp]++;
-		zv->zv_total_opens++;
-	}
-
-	mutex_exit(&zvol_state_lock);
-
-	return (0);
-}
-
-/*ARGSUSED*/
-int
-zvol_close(dev_t dev, int flag, int otyp, cred_t *cr)
-{
-	minor_t minor = getminor(dev);
-	zvol_state_t *zv;
-
-	if (minor == 0)		/* This is the control device */
-		return (0);
-
-	mutex_enter(&zvol_state_lock);
-
-	zv = ddi_get_soft_state(zvol_state, minor);
-	if (zv == NULL) {
-		mutex_exit(&zvol_state_lock);
-		return (ENXIO);
-	}
-
-	if (zv->zv_flags & ZVOL_EXCL) {
-		ASSERT(zv->zv_total_opens == 1);
-		zv->zv_flags &= ~ZVOL_EXCL;
-	}
-
-	/*
-	 * If the open count is zero, this is a spurious close.
-	 * That indicates a bug in the kernel / DDI framework.
-	 */
-	ASSERT(zv->zv_open_count[otyp] != 0);
-	ASSERT(zv->zv_total_opens != 0);
-
-	/*
-	 * You may get multiple opens, but only one close.
-	 */
-	zv->zv_open_count[otyp]--;
-	zv->zv_total_opens--;
-
-	mutex_exit(&zvol_state_lock);
-
-	return (0);
-}
-
-static 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_block(zgd->zgd_zilog, 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,
-		    DMU_READ_NO_PREFETCH));
-
-	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 its 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_block(zv->zv_zilog, &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);
-}
-
-/*
- * 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 resid,
-    boolean_t sync)
-{
-	uint32_t blocksize = zv->zv_volblocksize;
-	zilog_t *zilog = zv->zv_zilog;
-	boolean_t slogging;
-
-	if (zil_disable)
-		return;
-
-	if (zilog->zl_replay) {
-		dsl_dataset_dirty(dmu_objset_ds(zilog->zl_os), tx);
-		zilog->zl_replayed_seq[dmu_tx_get_txg(tx) & TXG_MASK] =
-		    zilog->zl_replaying_seq;
-		return;
-	}
-
-	slogging = spa_has_slogs(zilog->zl_spa);
-
-	while (resid) {
-		itx_t *itx;
-		lr_write_t *lr;
-		ssize_t len;
-		itx_wr_state_t write_state;
-
-		/*
-		 * Unlike zfs_log_write() we can be called with
-		 * upto DMU_MAX_ACCESS/2 (5MB) writes.
-		 */
-		if (blocksize > zvol_immediate_write_sz && !slogging &&
-		    resid >= blocksize && off % blocksize == 0) {
-			write_state = WR_INDIRECT; /* uses dmu_sync */
-			len = blocksize;
-		} else if (sync) {
-			write_state = WR_COPIED;
-			len = MIN(ZIL_MAX_LOG_DATA, resid);
-		} else {
-			write_state = WR_NEED_COPY;
-			len = MIN(ZIL_MAX_LOG_DATA, resid);
-		}
-
-		itx = zil_itx_create(TX_WRITE, sizeof (*lr) +
-		    (write_state == WR_COPIED ? len : 0));
-		lr = (lr_write_t *)&itx->itx_lr;
-		if (write_state == WR_COPIED && dmu_read(zv->zv_objset,
-		    ZVOL_OBJ, off, len, lr + 1, DMU_READ_NO_PREFETCH) != 0) {
-			kmem_free(itx, offsetof(itx_t, itx_lr) +
-			    itx->itx_lr.lrc_reclen);
-			itx = zil_itx_create(TX_WRITE, sizeof (*lr));
-			lr = (lr_write_t *)&itx->itx_lr;
-			write_state = WR_NEED_COPY;
-		}
-
-		itx->itx_wr_state = write_state;
-		if (write_state == WR_NEED_COPY)
-			itx->itx_sod += len;
-		lr->lr_foid = ZVOL_OBJ;
-		lr->lr_offset = off;
-		lr->lr_length = len;
-		lr->lr_blkoff = off - P2ALIGN_TYPED(off, blocksize, uint64_t);
-		BP_ZERO(&lr->lr_blkptr);
-
-		itx->itx_private = zv;
-		itx->itx_sync = sync;
-
-		(void) zil_itx_assign(zilog, itx, tx);
-
-		off += len;
-		resid -= len;
-	}
-}
-
-static int
-zvol_dumpio_vdev(vdev_t *vd, void *addr, uint64_t offset, uint64_t size,
-    boolean_t doread, boolean_t isdump)
-{
-	vdev_disk_t *dvd;
-	int c;
-	int numerrors = 0;
-
-	for (c = 0; c < vd->vdev_children; c++) {
-		ASSERT(vd->vdev_ops == &vdev_mirror_ops ||
-		    vd->vdev_ops == &vdev_replacing_ops ||
-		    vd->vdev_ops == &vdev_spare_ops);
-		int err = zvol_dumpio_vdev(vd->vdev_child[c],
-		    addr, offset, size, doread, isdump);
-		if (err != 0) {
-			numerrors++;
-		} else if (doread) {
-			break;
-		}
-	}
-
-	if (!vd->vdev_ops->vdev_op_leaf)
-		return (numerrors < vd->vdev_children ? 0 : EIO);
-
-	if (doread && !vdev_readable(vd))
-		return (EIO);
-	else if (!doread && !vdev_writeable(vd))
-		return (EIO);
-
-	dvd = vd->vdev_tsd;
-	ASSERT3P(dvd, !=, NULL);
-	offset += VDEV_LABEL_START_SIZE;
-
-	if (ddi_in_panic() || isdump) {
-		ASSERT(!doread);
-		if (doread)
-			return (EIO);
-		return (ldi_dump(dvd->vd_lh, addr, lbtodb(offset),
-		    lbtodb(size)));
-	} else {
-		return (vdev_disk_physio(dvd->vd_lh, addr, size, offset,
-		    doread ? B_READ : B_WRITE));
-	}
-}
-
-static int
-zvol_dumpio(zvol_state_t *zv, void *addr, uint64_t offset, uint64_t size,
-    boolean_t doread, boolean_t isdump)
-{
-	vdev_t *vd;
-	int error;
-	zvol_extent_t *ze;
-	spa_t *spa = dmu_objset_spa(zv->zv_objset);
-
-	/* Must be sector aligned, and not stradle a block boundary. */
-	if (P2PHASE(offset, DEV_BSIZE) || P2PHASE(size, DEV_BSIZE) ||
-	    P2BOUNDARY(offset, size, zv->zv_volblocksize)) {
-		return (EINVAL);
-	}
-	ASSERT(size <= zv->zv_volblocksize);
-
-	/* Locate the extent this belongs to */
-	ze = list_head(&zv->zv_extents);
-	while (offset >= ze->ze_nblks * zv->zv_volblocksize) {
-		offset -= ze->ze_nblks * zv->zv_volblocksize;
-		ze = list_next(&zv->zv_extents, ze);
-	}
-	spa_config_enter(spa, SCL_STATE, FTAG, RW_READER);
-	vd = vdev_lookup_top(spa, DVA_GET_VDEV(&ze->ze_dva));
-	offset += DVA_GET_OFFSET(&ze->ze_dva);
-	error = zvol_dumpio_vdev(vd, addr, offset, size, doread, isdump);
-	spa_config_exit(spa, SCL_STATE, FTAG);
-	return (error);
-}
-
-int
-zvol_strategy(buf_t *bp)
-{
-	zvol_state_t *zv = ddi_get_soft_state(zvol_state, getminor(bp->b_edev));
-	uint64_t off, volsize;
-	size_t resid;
-	char *addr;
-	objset_t *os;
-	rl_t *rl;
-	int error = 0;
-	boolean_t doread = bp->b_flags & B_READ;
-	boolean_t is_dump = zv->zv_flags & ZVOL_DUMPIFIED;
-	boolean_t sync;
-
-	if (zv == NULL) {
-		bioerror(bp, ENXIO);
-		biodone(bp);
-		return (0);
-	}
-
-	if (getminor(bp->b_edev) == 0) {
-		bioerror(bp, EINVAL);
-		biodone(bp);
-		return (0);
-	}
-
-	if (!(bp->b_flags & B_READ) &&
-	    (zv->zv_flags & ZVOL_RDONLY ||
-	    zv->zv_mode & DS_MODE_READONLY)) {
-		bioerror(bp, EROFS);
-		biodone(bp);
-		return (0);
-	}
-
-	off = ldbtob(bp->b_blkno);
-	volsize = zv->zv_volsize;
-
-	os = zv->zv_objset;
-	ASSERT(os != NULL);
-
-	bp_mapin(bp);
-	addr = bp->b_un.b_addr;
-	resid = bp->b_bcount;
-
-	if (resid > 0 && (off < 0 || off >= volsize)) {
-		bioerror(bp, EIO);
-		biodone(bp);
-		return (0);
-	}
-
-	sync = !(bp->b_flags & B_ASYNC) && !doread && !is_dump &&
-	    !(zv->zv_flags & ZVOL_WCE) && !zil_disable;
-
-	/*
-	 * There must be no buffer changes when doing a dmu_sync() because
-	 * we can't change the data whilst calculating the checksum.
-	 */
-	rl = zfs_range_lock(&zv->zv_znode, off, resid,
-	    doread ? RL_READER : RL_WRITER);
-
-	while (resid != 0 && off < volsize) {
-		size_t size = MIN(resid, zvol_maxphys);
-		if (is_dump) {
-			size = MIN(size, P2END(off, zv->zv_volblocksize) - off);
-			error = zvol_dumpio(zv, addr, off, size,
-			    doread, B_FALSE);
-		} else if (doread) {
-			error = dmu_read(os, ZVOL_OBJ, off, size, addr,
-			    DMU_READ_PREFETCH);
-		} 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, sync);
-				dmu_tx_commit(tx);
-			}
-		}
-		if (error) {
-			/* convert checksum errors into IO errors */
-			if (error == ECKSUM)
-				error = EIO;
-			break;
-		}
-		off += size;
-		addr += size;
-		resid -= size;
-	}
-	zfs_range_unlock(rl);
-
-	if ((bp->b_resid = resid) == bp->b_bcount)
-		bioerror(bp, off > volsize ? EINVAL : error);
-
-	if (sync)
-		zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
-	biodone(bp);
-
-	return (0);
-}
-
-/*
- * Set the buffer count to the zvol maximum transfer.
- * Using our own routine instead of the default minphys()
- * means that for larger writes we write bigger buffers on X86
- * (128K instead of 56K) and flush the disk write cache less often
- * (every zvol_maxphys - currently 1MB) instead of minphys (currently
- * 56K on X86 and 128K on sparc).
- */
-void
-zvol_minphys(struct buf *bp)
-{
-	if (bp->b_bcount > zvol_maxphys)
-		bp->b_bcount = zvol_maxphys;
-}
-
-int
-zvol_dump(dev_t dev, caddr_t addr, daddr_t blkno, int nblocks)
-{
-	minor_t minor = getminor(dev);
-	zvol_state_t *zv;
-	int error = 0;
-	uint64_t size;
-	uint64_t boff;
-	uint64_t resid;
-
-	if (minor == 0)			/* This is the control device */
-		return (ENXIO);
-
-	zv = ddi_get_soft_state(zvol_state, minor);
-	if (zv == NULL)
-		return (ENXIO);
-
-	boff = ldbtob(blkno);
-	resid = ldbtob(nblocks);
-
-	VERIFY3U(boff + resid, <=, zv->zv_volsize);
-
-	while (resid) {
-		size = MIN(resid, P2END(boff, zv->zv_volblocksize) - boff);
-		error = zvol_dumpio(zv, addr, boff, size, B_FALSE, B_TRUE);
-		if (error)
-			break;
-		boff += size;
-		addr += size;
-		resid -= size;
-	}
-
-	return (error);
-}
-
-/*ARGSUSED*/
-int
-zvol_read(dev_t dev, uio_t *uio, cred_t *cr)
-{
-	minor_t minor = getminor(dev);
-	zvol_state_t *zv;
-	uint64_t volsize;
-	rl_t *rl;
-	int error = 0;
-
-	if (minor == 0)			/* This is the control device */
-		return (ENXIO);
-
-	zv = ddi_get_soft_state(zvol_state, minor);
-	if (zv == NULL)
-		return (ENXIO);
-
-	volsize = zv->zv_volsize;
-	if (uio->uio_resid > 0 &&
-	    (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
-		return (EIO);
-
-	if (zv->zv_flags & ZVOL_DUMPIFIED) {
-		error = physio(zvol_strategy, NULL, dev, B_READ,
-		    zvol_minphys, uio);
-		return (error);
-	}
-
-	rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
-	    RL_READER);
-	while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
-		uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
-
-		/* don't read past the end */
-		if (bytes > volsize - uio->uio_loffset)
-			bytes = volsize - uio->uio_loffset;
-
-		error =  dmu_read_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes);
-		if (error) {
-			/* convert checksum errors into IO errors */
-			if (error == ECKSUM)
-				error = EIO;
-			break;
-		}
-	}
-	zfs_range_unlock(rl);
-	return (error);
-}
-
-/*ARGSUSED*/
-int
-zvol_write(dev_t dev, uio_t *uio, cred_t *cr)
-{
-	minor_t minor = getminor(dev);
-	zvol_state_t *zv;
-	uint64_t volsize;
-	rl_t *rl;
-	int error = 0;
-	boolean_t sync;
-
-	if (minor == 0)			/* This is the control device */
-		return (ENXIO);
-
-	zv = ddi_get_soft_state(zvol_state, minor);
-	if (zv == NULL)
-		return (ENXIO);
-
-	volsize = zv->zv_volsize;
-	if (uio->uio_resid > 0 &&
-	    (uio->uio_loffset < 0 || uio->uio_loffset >= volsize))
-		return (EIO);
-
-	if (zv->zv_flags & ZVOL_DUMPIFIED) {
-		error = physio(zvol_strategy, NULL, dev, B_WRITE,
-		    zvol_minphys, uio);
-		return (error);
-	}
-
-	sync = !(zv->zv_flags & ZVOL_WCE) && !zil_disable;
-
-	rl = zfs_range_lock(&zv->zv_znode, uio->uio_loffset, uio->uio_resid,
-	    RL_WRITER);
-	while (uio->uio_resid > 0 && uio->uio_loffset < volsize) {
-		uint64_t bytes = MIN(uio->uio_resid, DMU_MAX_ACCESS >> 1);
-		uint64_t off = uio->uio_loffset;
-		dmu_tx_t *tx = dmu_tx_create(zv->zv_objset);
-
-		if (bytes > volsize - off)	/* don't write past the end */
-			bytes = volsize - off;
-
-		dmu_tx_hold_write(tx, ZVOL_OBJ, off, bytes);
-		error = dmu_tx_assign(tx, TXG_WAIT);
-		if (error) {
-			dmu_tx_abort(tx);
-			break;
-		}
-		error = dmu_write_uio(zv->zv_objset, ZVOL_OBJ, uio, bytes, tx);
-		if (error == 0)
-			zvol_log_write(zv, tx, off, bytes, sync);
-		dmu_tx_commit(tx);
-
-		if (error)
-			break;
-	}
-	zfs_range_unlock(rl);
-	if (sync)
-		zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
-	return (error);
-}
-
-int
-zvol_getefi(void *arg, int flag, uint64_t vs, uint8_t bs)
-{
-	struct uuid uuid = EFI_RESERVED;
-	efi_gpe_t gpe = { 0 };
-	uint32_t crc;
-	dk_efi_t efi;
-	int length;
-	char *ptr;
-
-	if (ddi_copyin(arg, &efi, sizeof (dk_efi_t), flag))
-		return (EFAULT);
-	ptr = (char *)(uintptr_t)efi.dki_data_64;
-	length = efi.dki_length;
-	/*
-	 * Some clients may attempt to request a PMBR for the
-	 * zvol.  Currently this interface will return EINVAL to
-	 * such requests.  These requests could be supported by
-	 * adding a check for lba == 0 and consing up an appropriate
-	 * PMBR.
-	 */
-	if (efi.dki_lba < 1 || efi.dki_lba > 2 || length <= 0)
-		return (EINVAL);
-
-	gpe.efi_gpe_StartingLBA = LE_64(34ULL);
-	gpe.efi_gpe_EndingLBA = LE_64((vs >> bs) - 1);
-	UUID_LE_CONVERT(gpe.efi_gpe_PartitionTypeGUID, uuid);
-
-	if (efi.dki_lba == 1) {
-		efi_gpt_t gpt = { 0 };
-
-		gpt.efi_gpt_Signature = LE_64(EFI_SIGNATURE);
-		gpt.efi_gpt_Revision = LE_32(EFI_VERSION_CURRENT);
-		gpt.efi_gpt_HeaderSize = LE_32(sizeof (gpt));
-		gpt.efi_gpt_MyLBA = LE_64(1ULL);
-		gpt.efi_gpt_FirstUsableLBA = LE_64(34ULL);
-		gpt.efi_gpt_LastUsableLBA = LE_64((vs >> bs) - 1);
-		gpt.efi_gpt_PartitionEntryLBA = LE_64(2ULL);
-		gpt.efi_gpt_NumberOfPartitionEntries = LE_32(1);
-		gpt.efi_gpt_SizeOfPartitionEntry =
-		    LE_32(sizeof (efi_gpe_t));
-		CRC32(crc, &gpe, sizeof (gpe), -1U, crc32_table);
-		gpt.efi_gpt_PartitionEntryArrayCRC32 = LE_32(~crc);
-		CRC32(crc, &gpt, sizeof (gpt), -1U, crc32_table);
-		gpt.efi_gpt_HeaderCRC32 = LE_32(~crc);
-		if (ddi_copyout(&gpt, ptr, MIN(sizeof (gpt), length),
-		    flag))
-			return (EFAULT);
-		ptr += sizeof (gpt);
-		length -= sizeof (gpt);
-	}
-	if (length > 0 && ddi_copyout(&gpe, ptr, MIN(sizeof (gpe),
-	    length), flag))
-		return (EFAULT);
-	return (0);
-}
-
-/*
- * Dirtbag ioctls to support mkfs(1M) for UFS filesystems.  See dkio(7I).
- */
-/*ARGSUSED*/
-int
-zvol_ioctl(dev_t dev, int cmd, intptr_t arg, int flag, cred_t *cr, int *rvalp)
-{
-	zvol_state_t *zv;
-	struct dk_cinfo dki;
-	struct dk_minfo dkm;
-	struct dk_callback *dkc;
-	int error = 0;
-	rl_t *rl;
-
-	mutex_enter(&zvol_state_lock);
-
-	zv = ddi_get_soft_state(zvol_state, getminor(dev));
-
-	if (zv == NULL) {
-		mutex_exit(&zvol_state_lock);
-		return (ENXIO);
-	}
-	ASSERT(zv->zv_total_opens > 0);
-
-	switch (cmd) {
-
-	case DKIOCINFO:
-		bzero(&dki, sizeof (dki));
-		(void) strcpy(dki.dki_cname, "zvol");
-		(void) strcpy(dki.dki_dname, "zvol");
-		dki.dki_ctype = DKC_UNKNOWN;
-		dki.dki_maxtransfer = 1 << (SPA_MAXBLOCKSHIFT - zv->zv_min_bs);
-		mutex_exit(&zvol_state_lock);
-		if (ddi_copyout(&dki, (void *)arg, sizeof (dki), flag))
-			error = EFAULT;
-		return (error);
-
-	case DKIOCGMEDIAINFO:
-		bzero(&dkm, sizeof (dkm));
-		dkm.dki_lbsize = 1U << zv->zv_min_bs;
-		dkm.dki_capacity = zv->zv_volsize >> zv->zv_min_bs;
-		dkm.dki_media_type = DK_UNKNOWN;
-		mutex_exit(&zvol_state_lock);
-		if (ddi_copyout(&dkm, (void *)arg, sizeof (dkm), flag))
-			error = EFAULT;
-		return (error);
-
-	case DKIOCGETEFI:
-		{
-			uint64_t vs = zv->zv_volsize;
-			uint8_t bs = zv->zv_min_bs;
-
-			mutex_exit(&zvol_state_lock);
-			error = zvol_getefi((void *)arg, flag, vs, bs);
-			return (error);
-		}
-
-	case DKIOCFLUSHWRITECACHE:
-		dkc = (struct dk_callback *)arg;
-		mutex_exit(&zvol_state_lock);
-		zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
-		if ((flag & FKIOCTL) && dkc != NULL && dkc->dkc_callback) {
-			(*dkc->dkc_callback)(dkc->dkc_cookie, error);
-			error = 0;
-		}
-		return (error);
-
-	case DKIOCGETWCE:
-		{
-			int wce = (zv->zv_flags & ZVOL_WCE) ? 1 : 0;
-			if (ddi_copyout(&wce, (void *)arg, sizeof (int),
-			    flag))
-				error = EFAULT;
-			break;
-		}
-	case DKIOCSETWCE:
-		{
-			int wce;
-			if (ddi_copyin((void *)arg, &wce, sizeof (int),
-			    flag)) {
-				error = EFAULT;
-				break;
-			}
-			if (wce) {
-				zv->zv_flags |= ZVOL_WCE;
-				mutex_exit(&zvol_state_lock);
-			} else {
-				zv->zv_flags &= ~ZVOL_WCE;
-				mutex_exit(&zvol_state_lock);
-				zil_commit(zv->zv_zilog, UINT64_MAX, ZVOL_OBJ);
-			}
-			return (0);
-		}
-
-	case DKIOCGGEOM:
-	case DKIOCGVTOC:
-		/*
-		 * commands using these (like prtvtoc) expect ENOTSUP
-		 * since we're emulating an EFI label
-		 */
-		error = ENOTSUP;
-		break;
-
-	case DKIOCDUMPINIT:
-		rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
-		    RL_WRITER);
-		error = zvol_dumpify(zv);
-		zfs_range_unlock(rl);
-		break;
-
-	case DKIOCDUMPFINI:
-		if (!(zv->zv_flags & ZVOL_DUMPIFIED))
-			break;
-		rl = zfs_range_lock(&zv->zv_znode, 0, zv->zv_volsize,
-		    RL_WRITER);
-		error = zvol_dump_fini(zv);
-		zfs_range_unlock(rl);
-		break;
-
-	default:
-		error = ENOTTY;
-		break;
-
-	}
-	mutex_exit(&zvol_state_lock);
-	return (error);
-}
-
-int
-zvol_busy(void)
-{
-	return (zvol_minors != 0);
-}
-
-void
-zvol_init(void)
-{
-	VERIFY(ddi_soft_state_init(&zvol_state, sizeof (zvol_state_t), 1) == 0);
-	mutex_init(&zvol_state_lock, NULL, MUTEX_DEFAULT, NULL);
-}
-
-void
-zvol_fini(void)
-{
-	mutex_destroy(&zvol_state_lock);
-	ddi_soft_state_fini(&zvol_state);
-}
-
-static boolean_t
-zvol_is_swap(zvol_state_t *zv)
-{
-	vnode_t *vp;
-	boolean_t ret = B_FALSE;
-	char *devpath;
-	size_t devpathlen;
-	int error;
-
-	devpathlen = strlen(ZVOL_FULL_DEV_DIR) + strlen(zv->zv_name) + 1;
-	devpath = kmem_alloc(devpathlen, KM_SLEEP);
-	(void) sprintf(devpath, "%s%s", ZVOL_FULL_DEV_DIR, zv->zv_name);
-	error = lookupname(devpath, UIO_SYSSPACE, FOLLOW, NULLVPP, &vp);
-	kmem_free(devpath, devpathlen);
-
-	ret = !error && IS_SWAPVP(common_specvp(vp));
-
-	if (vp != NULL)
-		VN_RELE(vp);
-
-	return (ret);
-}
-
-static int
-zvol_dump_init(zvol_state_t *zv, boolean_t resize)
-{
-	dmu_tx_t *tx;
-	int error = 0;
-	objset_t *os = zv->zv_objset;
-	nvlist_t *nv = NULL;
-
-	ASSERT(MUTEX_HELD(&zvol_state_lock));
-
-	tx = dmu_tx_create(os);
-	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
-	error = dmu_tx_assign(tx, TXG_WAIT);
-	if (error) {
-		dmu_tx_abort(tx);
-		return (error);
-	}
-
-	/*
-	 * If we are resizing the dump device then we only need to
-	 * update the refreservation to match the newly updated
-	 * zvolsize. Otherwise, we save off the original state of the
-	 * zvol so that we can restore them if the zvol is ever undumpified.
-	 */
-	if (resize) {
-		error = zap_update(os, ZVOL_ZAP_OBJ,
-		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
-		    &zv->zv_volsize, tx);
-	} else {
-		uint64_t checksum, compress, refresrv, vbs;
-
-		error = dsl_prop_get_integer(zv->zv_name,
-		    zfs_prop_to_name(ZFS_PROP_COMPRESSION), &compress, NULL);
-		error = error ? error : dsl_prop_get_integer(zv->zv_name,
-		    zfs_prop_to_name(ZFS_PROP_CHECKSUM), &checksum, NULL);
-		error = error ? error : dsl_prop_get_integer(zv->zv_name,
-		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), &refresrv, NULL);
-		error = error ? error : dsl_prop_get_integer(zv->zv_name,
-		    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), &vbs, NULL);
-
-		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
-		    zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1,
-		    &compress, tx);
-		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
-		    zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum, tx);
-		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
-		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1,
-		    &refresrv, tx);
-		error = error ? error : zap_update(os, ZVOL_ZAP_OBJ,
-		    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1,
-		    &vbs, tx);
-	}
-	dmu_tx_commit(tx);
-
-	/* Truncate the file */
-	if (!error)
-		error = dmu_free_long_range(zv->zv_objset,
-		    ZVOL_OBJ, 0, DMU_OBJECT_END);
-
-	if (error)
-		return (error);
-
-	/*
-	 * We only need update the zvol's property if we are initializing
-	 * the dump area for the first time.
-	 */
-	if (!resize) {
-		VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
-		VERIFY(nvlist_add_uint64(nv,
-		    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 0) == 0);
-		VERIFY(nvlist_add_uint64(nv,
-		    zfs_prop_to_name(ZFS_PROP_COMPRESSION),
-		    ZIO_COMPRESS_OFF) == 0);
-		VERIFY(nvlist_add_uint64(nv,
-		    zfs_prop_to_name(ZFS_PROP_CHECKSUM),
-		    ZIO_CHECKSUM_OFF) == 0);
-		VERIFY(nvlist_add_uint64(nv,
-		    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE),
-		    SPA_MAXBLOCKSIZE) == 0);
-
-		error = zfs_set_prop_nvlist(zv->zv_name, nv);
-		nvlist_free(nv);
-
-		if (error)
-			return (error);
-	}
-
-	/* Allocate the space for the dump */
-	error = zvol_prealloc(zv);
-	return (error);
-}
-
-static int
-zvol_dumpify(zvol_state_t *zv)
-{
-	int error = 0;
-	uint64_t dumpsize = 0;
-	dmu_tx_t *tx;
-	objset_t *os = zv->zv_objset;
-
-	if (zv->zv_flags & ZVOL_RDONLY || (zv->zv_mode & DS_MODE_READONLY))
-		return (EROFS);
-
-	/*
-	 * We do not support swap devices acting as dump devices.
-	 */
-	if (zvol_is_swap(zv))
-		return (ENOTSUP);
-
-	if (zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE,
-	    8, 1, &dumpsize) != 0 || dumpsize != zv->zv_volsize) {
-		boolean_t resize = (dumpsize > 0) ? B_TRUE : B_FALSE;
-
-		if ((error = zvol_dump_init(zv, resize)) != 0) {
-			(void) zvol_dump_fini(zv);
-			return (error);
-		}
-	}
-
-	/*
-	 * Build up our lba mapping.
-	 */
-	error = zvol_get_lbas(zv);
-	if (error) {
-		(void) zvol_dump_fini(zv);
-		return (error);
-	}
-
-	tx = dmu_tx_create(os);
-	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
-	error = dmu_tx_assign(tx, TXG_WAIT);
-	if (error) {
-		dmu_tx_abort(tx);
-		(void) zvol_dump_fini(zv);
-		return (error);
-	}
-
-	zv->zv_flags |= ZVOL_DUMPIFIED;
-	error = zap_update(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, 8, 1,
-	    &zv->zv_volsize, tx);
-	dmu_tx_commit(tx);
-
-	if (error) {
-		(void) zvol_dump_fini(zv);
-		return (error);
-	}
-
-	txg_wait_synced(dmu_objset_pool(os), 0);
-	return (0);
-}
-
-static int
-zvol_dump_fini(zvol_state_t *zv)
-{
-	dmu_tx_t *tx;
-	objset_t *os = zv->zv_objset;
-	nvlist_t *nv;
-	int error = 0;
-	uint64_t checksum, compress, refresrv, vbs;
-
-	/*
-	 * Attempt to restore the zvol back to its pre-dumpified state.
-	 * This is a best-effort attempt as it's possible that not all
-	 * of these properties were initialized during the dumpify process
-	 * (i.e. error during zvol_dump_init).
-	 */
-
-	tx = dmu_tx_create(os);
-	dmu_tx_hold_zap(tx, ZVOL_ZAP_OBJ, TRUE, NULL);
-	error = dmu_tx_assign(tx, TXG_WAIT);
-	if (error) {
-		dmu_tx_abort(tx);
-		return (error);
-	}
-	(void) zap_remove(os, ZVOL_ZAP_OBJ, ZVOL_DUMPSIZE, tx);
-	dmu_tx_commit(tx);
-
-	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
-	    zfs_prop_to_name(ZFS_PROP_CHECKSUM), 8, 1, &checksum);
-	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
-	    zfs_prop_to_name(ZFS_PROP_COMPRESSION), 8, 1, &compress);
-	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
-	    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), 8, 1, &refresrv);
-	(void) zap_lookup(zv->zv_objset, ZVOL_ZAP_OBJ,
-	    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), 8, 1, &vbs);
-
-	VERIFY(nvlist_alloc(&nv, NV_UNIQUE_NAME, KM_SLEEP) == 0);
-	(void) nvlist_add_uint64(nv,
-	    zfs_prop_to_name(ZFS_PROP_CHECKSUM), checksum);
-	(void) nvlist_add_uint64(nv,
-	    zfs_prop_to_name(ZFS_PROP_COMPRESSION), compress);
-	(void) nvlist_add_uint64(nv,
-	    zfs_prop_to_name(ZFS_PROP_REFRESERVATION), refresrv);
-	(void) nvlist_add_uint64(nv,
-	    zfs_prop_to_name(ZFS_PROP_VOLBLOCKSIZE), vbs);
-	(void) zfs_set_prop_nvlist(zv->zv_name, nv);
-	nvlist_free(nv);
-
-	zvol_free_extents(zv);
-	zv->zv_flags &= ~ZVOL_DUMPIFIED;
-	(void) dmu_free_long_range(os, ZVOL_OBJ, 0, DMU_OBJECT_END);
-
-	return (0);
-}