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115 lines
3.0 KiB
C
115 lines
3.0 KiB
C
/*
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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 (the "License").
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* You may not use this file except in compliance 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 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#include <sys/zfs_context.h>
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#include <sys/spa.h>
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#include <sys/vdev_impl.h>
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#include <sys/zio.h>
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#include <sys/fs/zfs.h>
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/*
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* Virtual device vector for the pool's root vdev.
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*/
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/*
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* We should be able to tolerate one failure with absolutely no damage
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* to our metadata. Two failures will take out space maps, a bunch of
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* indirect block trees, meta dnodes, dnodes, etc. Probably not a happy
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* place to live. When we get smarter, we can liberalize this policy.
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* e.g. If we haven't lost two consecutive top-level vdevs, then we are
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* probably fine. Adding bean counters during alloc/free can make this
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* future guesswork more accurate.
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*/
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static int
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too_many_errors(vdev_t *vd, int numerrors)
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{
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ASSERT3U(numerrors, <=, vd->vdev_children);
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return (numerrors > 0);
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}
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static int
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vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *ashift)
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{
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int lasterror = 0;
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int numerrors = 0;
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if (vd->vdev_children == 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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vdev_open_children(vd);
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for (int c = 0; c < vd->vdev_children; c++) {
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vdev_t *cvd = vd->vdev_child[c];
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if (cvd->vdev_open_error && !cvd->vdev_islog) {
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lasterror = cvd->vdev_open_error;
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numerrors++;
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}
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}
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if (too_many_errors(vd, numerrors)) {
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vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS;
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return (lasterror);
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}
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*asize = 0;
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*ashift = 0;
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return (0);
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}
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static void
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vdev_root_close(vdev_t *vd)
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{
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for (int c = 0; c < vd->vdev_children; c++)
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vdev_close(vd->vdev_child[c]);
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}
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static void
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vdev_root_state_change(vdev_t *vd, int faulted, int degraded)
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{
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if (too_many_errors(vd, faulted)) {
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vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN,
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VDEV_AUX_NO_REPLICAS);
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} else if (degraded) {
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vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE);
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} else {
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vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE);
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}
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}
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vdev_ops_t vdev_root_ops = {
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vdev_root_open,
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vdev_root_close,
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vdev_default_asize,
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NULL, /* io_start - not applicable to the root */
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NULL, /* io_done - not applicable to the root */
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vdev_root_state_change,
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VDEV_TYPE_ROOT, /* name of this vdev type */
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B_FALSE /* not a leaf vdev */
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};
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