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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License, Version 1.0 only
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* (the "License"). You may not use this file except in compliance
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* with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#pragma ident "%Z%%M% %I% %E% SMI"
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/vdev_disk.h>
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#include <sys/vdev_impl.h>
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#include <sys/fs/zfs.h>
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#include <sys/zio.h>
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#include <sys/sunldi.h>
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/*
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* Virtual device vector for disks.
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*/
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extern ldi_ident_t zfs_li;
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typedef struct vdev_disk_buf {
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buf_t vdb_buf;
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zio_t *vdb_io;
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} vdev_disk_buf_t;
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static int
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vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
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{
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vdev_disk_t *dvd;
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int error;
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/*
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* We must have a pathname, and it must be absolute.
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*/
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if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
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vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
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return (EINVAL);
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}
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dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP);
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/*
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* When opening a disk device, we want to preserve the user's original
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* intent. We always want to open the device by the path the user gave
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* us, even if it is one of multiple paths to the save device. But we
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* also want to be able to survive disks being removed/recabled.
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* Therefore the sequence of opening devices is:
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*
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* 1. Try opening the device by path. For legacy pools without the
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* 'whole_disk' property, attempt to fix the path by appending 's0'.
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*
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* 2. If the devid of the device matches the stored value, return
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* success.
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*
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* 3. Otherwise, the device may have moved. Try opening the device
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* by the devid instead.
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*
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*/
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if (vd->vdev_devid != NULL) {
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if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid,
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&dvd->vd_minor) != 0) {
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vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
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return (EINVAL);
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}
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}
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error = EINVAL; /* presume failure */
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if (vd->vdev_path != NULL) {
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ddi_devid_t devid;
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if (vd->vdev_wholedisk == -1ULL) {
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size_t len = strlen(vd->vdev_path) + 3;
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char *buf = kmem_alloc(len, KM_SLEEP);
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ldi_handle_t lh;
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(void) snprintf(buf, len, "%ss0", vd->vdev_path);
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if (ldi_open_by_name(buf, spa_mode, kcred,
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&lh, zfs_li) == 0) {
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spa_strfree(vd->vdev_path);
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vd->vdev_path = buf;
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vd->vdev_wholedisk = 1ULL;
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(void) ldi_close(lh, spa_mode, kcred);
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} else {
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kmem_free(buf, len);
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}
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}
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error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred,
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&dvd->vd_lh, zfs_li);
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/*
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* Compare the devid to the stored value.
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*/
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if (error == 0 && vd->vdev_devid != NULL &&
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ldi_get_devid(dvd->vd_lh, &devid) == 0) {
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if (ddi_devid_compare(devid, dvd->vd_devid) != 0) {
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error = EINVAL;
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(void) ldi_close(dvd->vd_lh, spa_mode, kcred);
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dvd->vd_lh = NULL;
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}
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ddi_devid_free(devid);
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}
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/*
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* If we succeeded in opening the device, but 'vdev_wholedisk'
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* is not yet set, then this must be a slice.
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*/
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if (error == 0 && vd->vdev_wholedisk == -1ULL)
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vd->vdev_wholedisk = 0;
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}
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/*
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* If we were unable to open by path, or the devid check fails, open by
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* devid instead.
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*/
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if (error != 0 && vd->vdev_devid != NULL)
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error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor,
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spa_mode, kcred, &dvd->vd_lh, zfs_li);
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if (error) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (error);
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}
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/*
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* Determine the actual size of the device.
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*/
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if (ldi_get_size(dvd->vd_lh, psize) != 0) {
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vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
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return (EINVAL);
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}
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*ashift = SPA_MINBLOCKSHIFT;
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return (0);
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}
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static void
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vdev_disk_close(vdev_t *vd)
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{
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vdev_disk_t *dvd = vd->vdev_tsd;
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if (dvd == NULL)
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return;
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dprintf("removing disk %s, devid %s\n",
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vd->vdev_path ? vd->vdev_path : "<none>",
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vd->vdev_devid ? vd->vdev_devid : "<none>");
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if (dvd->vd_minor != NULL)
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ddi_devid_str_free(dvd->vd_minor);
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if (dvd->vd_devid != NULL)
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ddi_devid_free(dvd->vd_devid);
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if (dvd->vd_lh != NULL)
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(void) ldi_close(dvd->vd_lh, spa_mode, kcred);
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kmem_free(dvd, sizeof (vdev_disk_t));
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vd->vdev_tsd = NULL;
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}
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static void
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vdev_disk_io_intr(buf_t *bp)
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{
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vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp;
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zio_t *zio = vdb->vdb_io;
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if ((zio->io_error = geterror(bp)) == 0 && bp->b_resid != 0)
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zio->io_error = EIO;
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kmem_free(vdb, sizeof (vdev_disk_buf_t));
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zio_next_stage_async(zio);
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}
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static void
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vdev_disk_ioctl_done(void *zio_arg, int error)
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{
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zio_t *zio = zio_arg;
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zio->io_error = error;
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zio_next_stage_async(zio);
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}
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static void
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vdev_disk_io_start(zio_t *zio)
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{
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vdev_t *vd = zio->io_vd;
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vdev_disk_t *dvd = vd->vdev_tsd;
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vdev_disk_buf_t *vdb;
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buf_t *bp;
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int flags, error;
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if (zio->io_type == ZIO_TYPE_IOCTL) {
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zio_vdev_io_bypass(zio);
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/* XXPOLICY */
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if (vdev_is_dead(vd)) {
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zio->io_error = ENXIO;
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zio_next_stage_async(zio);
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return;
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}
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switch (zio->io_cmd) {
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case DKIOCFLUSHWRITECACHE:
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zio->io_dk_callback.dkc_callback = vdev_disk_ioctl_done;
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zio->io_dk_callback.dkc_cookie = zio;
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error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
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(uintptr_t)&zio->io_dk_callback,
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FKIOCTL, kcred, NULL);
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if (error == 0) {
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/*
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* The ioctl will be done asychronously,
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* and will call vdev_disk_ioctl_done()
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* upon completion.
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*/
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return;
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}
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zio->io_error = error;
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break;
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default:
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zio->io_error = ENOTSUP;
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}
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zio_next_stage_async(zio);
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return;
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}
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if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0)
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return;
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if ((zio = vdev_queue_io(zio)) == NULL)
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return;
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flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
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flags |= B_BUSY | B_NOCACHE;
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if (zio->io_flags & ZIO_FLAG_FAILFAST)
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flags |= B_FAILFAST;
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vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP);
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vdb->vdb_io = zio;
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bp = &vdb->vdb_buf;
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bioinit(bp);
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bp->b_flags = flags;
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bp->b_bcount = zio->io_size;
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bp->b_un.b_addr = zio->io_data;
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bp->b_lblkno = lbtodb(zio->io_offset);
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bp->b_bufsize = zio->io_size;
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bp->b_iodone = (int (*)())vdev_disk_io_intr;
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/* XXPOLICY */
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error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio);
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if (error) {
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zio->io_error = error;
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bioerror(bp, error);
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bp->b_resid = bp->b_bcount;
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bp->b_iodone(bp);
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return;
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}
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error = ldi_strategy(dvd->vd_lh, bp);
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/* ldi_strategy() will return non-zero only on programming errors */
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ASSERT(error == 0);
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}
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static void
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vdev_disk_io_done(zio_t *zio)
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{
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vdev_queue_io_done(zio);
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if (zio->io_type == ZIO_TYPE_WRITE)
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vdev_cache_write(zio);
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zio_next_stage(zio);
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}
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vdev_ops_t vdev_disk_ops = {
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vdev_disk_open,
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vdev_disk_close,
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vdev_default_asize,
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vdev_disk_io_start,
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vdev_disk_io_done,
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NULL,
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VDEV_TYPE_DISK, /* name of this vdev type */
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B_TRUE /* leaf vdev */
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};
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