vdev_disk.c revision ea8dc4b6d2251b437950c0056bc626b311c73c27
/*
* 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 2006 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#pragma ident "%Z%%M% %I% %E% SMI"
#include <sys/zfs_context.h>
#include <sys/spa.h>
#include <sys/vdev_disk.h>
#include <sys/vdev_impl.h>
#include <sys/fs/zfs.h>
#include <sys/zio.h>
#include <sys/sunldi.h>
/*
* Virtual device vector for disks.
*/
extern ldi_ident_t zfs_li;
typedef struct vdev_disk_buf {
buf_t vdb_buf;
zio_t *vdb_io;
} vdev_disk_buf_t;
static int
vdev_disk_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift)
{
vdev_disk_t *dvd;
int error;
/*
* We must have a pathname, and it must be absolute.
*/
if (vd->vdev_path == NULL || vd->vdev_path[0] != '/') {
vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
return (EINVAL);
}
dvd = vd->vdev_tsd = kmem_zalloc(sizeof (vdev_disk_t), KM_SLEEP);
/*
* When opening a disk device, we want to preserve the user's original
* intent. We always want to open the device by the path the user gave
* us, even if it is one of multiple paths to the save device. But we
* also want to be able to survive disks being removed/recabled.
* Therefore the sequence of opening devices is:
*
* 1. Try opening the device by path. For legacy pools without the
* 'whole_disk' property, attempt to fix the path by appending 's0'.
*
* 2. If the devid of the device matches the stored value, return
* success.
*
* 3. Otherwise, the device may have moved. Try opening the device
* by the devid instead.
*
*/
if (vd->vdev_devid != NULL) {
if (ddi_devid_str_decode(vd->vdev_devid, &dvd->vd_devid,
&dvd->vd_minor) != 0) {
vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL;
return (EINVAL);
}
}
error = EINVAL; /* presume failure */
if (vd->vdev_path != NULL) {
ddi_devid_t devid;
if (vd->vdev_wholedisk == -1ULL) {
size_t len = strlen(vd->vdev_path) + 3;
char *buf = kmem_alloc(len, KM_SLEEP);
ldi_handle_t lh;
(void) snprintf(buf, len, "%ss0", vd->vdev_path);
if (ldi_open_by_name(buf, spa_mode, kcred,
&lh, zfs_li) == 0) {
spa_strfree(vd->vdev_path);
vd->vdev_path = buf;
vd->vdev_wholedisk = 1ULL;
(void) ldi_close(lh, spa_mode, kcred);
} else {
kmem_free(buf, len);
}
}
error = ldi_open_by_name(vd->vdev_path, spa_mode, kcred,
&dvd->vd_lh, zfs_li);
/*
* Compare the devid to the stored value.
*/
if (error == 0 && vd->vdev_devid != NULL &&
ldi_get_devid(dvd->vd_lh, &devid) == 0) {
if (ddi_devid_compare(devid, dvd->vd_devid) != 0) {
error = EINVAL;
(void) ldi_close(dvd->vd_lh, spa_mode, kcred);
dvd->vd_lh = NULL;
}
ddi_devid_free(devid);
}
/*
* If we succeeded in opening the device, but 'vdev_wholedisk'
* is not yet set, then this must be a slice.
*/
if (error == 0 && vd->vdev_wholedisk == -1ULL)
vd->vdev_wholedisk = 0;
}
/*
* If we were unable to open by path, or the devid check fails, open by
* devid instead.
*/
if (error != 0 && vd->vdev_devid != NULL)
error = ldi_open_by_devid(dvd->vd_devid, dvd->vd_minor,
spa_mode, kcred, &dvd->vd_lh, zfs_li);
if (error) {
vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
return (error);
}
/*
* Determine the actual size of the device.
*/
if (ldi_get_size(dvd->vd_lh, psize) != 0) {
vd->vdev_stat.vs_aux = VDEV_AUX_OPEN_FAILED;
return (EINVAL);
}
*ashift = SPA_MINBLOCKSHIFT;
if (vd->vdev_wholedisk == 1) {
int wce, rc;
/*
* Enable disk write caching if we own the whole disk.
* Ignore errors as this is a performance optimization,
* we work just fine w/o it.
*/
error = 0;
wce = 1;
rc = ldi_ioctl(dvd->vd_lh, DKIOCSETWCE, (intptr_t)&wce,
FKIOCTL, kcred, &error);
if (rc || error)
dprintf("%s: DKIOCSETWCE failed %d,%d",
vdev_description(vd), rc, error);
}
return (0);
}
static void
vdev_disk_close(vdev_t *vd)
{
vdev_disk_t *dvd = vd->vdev_tsd;
if (dvd == NULL)
return;
dprintf("removing disk %s, devid %s\n",
vd->vdev_path ? vd->vdev_path : "<none>",
vd->vdev_devid ? vd->vdev_devid : "<none>");
if (dvd->vd_minor != NULL)
ddi_devid_str_free(dvd->vd_minor);
if (dvd->vd_devid != NULL)
ddi_devid_free(dvd->vd_devid);
if (dvd->vd_lh != NULL)
(void) ldi_close(dvd->vd_lh, spa_mode, kcred);
kmem_free(dvd, sizeof (vdev_disk_t));
vd->vdev_tsd = NULL;
}
static void
vdev_disk_io_intr(buf_t *bp)
{
vdev_disk_buf_t *vdb = (vdev_disk_buf_t *)bp;
zio_t *zio = vdb->vdb_io;
if ((zio->io_error = geterror(bp)) == 0 && bp->b_resid != 0)
zio->io_error = EIO;
kmem_free(vdb, sizeof (vdev_disk_buf_t));
zio_next_stage_async(zio);
}
static void
vdev_disk_ioctl_done(void *zio_arg, int error)
{
zio_t *zio = zio_arg;
zio->io_error = error;
zio_next_stage_async(zio);
}
static void
vdev_disk_io_start(zio_t *zio)
{
vdev_t *vd = zio->io_vd;
vdev_disk_t *dvd = vd->vdev_tsd;
vdev_disk_buf_t *vdb;
buf_t *bp;
int flags, error;
if (zio->io_type == ZIO_TYPE_IOCTL) {
zio_vdev_io_bypass(zio);
/* XXPOLICY */
if (vdev_is_dead(vd)) {
zio->io_error = ENXIO;
zio_next_stage_async(zio);
return;
}
switch (zio->io_cmd) {
case DKIOCFLUSHWRITECACHE:
zio->io_dk_callback.dkc_callback = vdev_disk_ioctl_done;
zio->io_dk_callback.dkc_cookie = zio;
error = ldi_ioctl(dvd->vd_lh, zio->io_cmd,
(uintptr_t)&zio->io_dk_callback,
FKIOCTL, kcred, NULL);
if (error == 0) {
/*
* The ioctl will be done asychronously,
* and will call vdev_disk_ioctl_done()
* upon completion.
*/
return;
}
zio->io_error = error;
break;
default:
zio->io_error = ENOTSUP;
}
zio_next_stage_async(zio);
return;
}
if (zio->io_type == ZIO_TYPE_READ && vdev_cache_read(zio) == 0)
return;
if ((zio = vdev_queue_io(zio)) == NULL)
return;
flags = (zio->io_type == ZIO_TYPE_READ ? B_READ : B_WRITE);
flags |= B_BUSY | B_NOCACHE;
if (zio->io_flags & ZIO_FLAG_FAILFAST)
flags |= B_FAILFAST;
vdb = kmem_alloc(sizeof (vdev_disk_buf_t), KM_SLEEP);
vdb->vdb_io = zio;
bp = &vdb->vdb_buf;
bioinit(bp);
bp->b_flags = flags;
bp->b_bcount = zio->io_size;
bp->b_un.b_addr = zio->io_data;
bp->b_lblkno = lbtodb(zio->io_offset);
bp->b_bufsize = zio->io_size;
bp->b_iodone = (int (*)())vdev_disk_io_intr;
/* XXPOLICY */
error = vdev_is_dead(vd) ? ENXIO : vdev_error_inject(vd, zio);
if (error) {
zio->io_error = error;
bioerror(bp, error);
bp->b_resid = bp->b_bcount;
bp->b_iodone(bp);
return;
}
error = ldi_strategy(dvd->vd_lh, bp);
/* ldi_strategy() will return non-zero only on programming errors */
ASSERT(error == 0);
}
static void
vdev_disk_io_done(zio_t *zio)
{
vdev_queue_io_done(zio);
if (zio->io_type == ZIO_TYPE_WRITE)
vdev_cache_write(zio);
if (zio_injection_enabled && zio->io_error == 0)
zio->io_error = zio_handle_device_injection(zio->io_vd, EIO);
zio_next_stage(zio);
}
vdev_ops_t vdev_disk_ops = {
vdev_disk_open,
vdev_disk_close,
vdev_default_asize,
vdev_disk_io_start,
vdev_disk_io_done,
NULL,
VDEV_TYPE_DISK, /* name of this vdev type */
B_TRUE /* leaf vdev */
};