/* * 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 2007 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_impl.h> #include <sys/zio.h> #include <sys/fs/zfs.h> /* * Virtual device vector for the pool's root vdev. */ /* * We should be able to tolerate one failure with absolutely no damage * to our metadata. Two failures will take out space maps, a bunch of * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy * place to live. When we get smarter, we can liberalize this policy. * e.g. If we haven't lost two consecutive top-level vdevs, then we are * probably fine. Adding bean counters during alloc/free can make this * future guesswork more accurate. */ static int too_many_errors(vdev_t *vd, int numerrors) { ASSERT3U(numerrors, <=, vd->vdev_children); return (numerrors == vd->vdev_children); } static int vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *ashift) { int c; int lasterror = 0; int numerrors = 0; if (vd->vdev_children == 0) { vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; return (EINVAL); } for (c = 0; c < vd->vdev_children; c++) { vdev_t *cvd = vd->vdev_child[c]; int error; if ((error = vdev_open(cvd)) != 0) { lasterror = error; numerrors++; continue; } } if (numerrors > 0) { if (!too_many_errors(vd, numerrors)) { /* XXX - should not be explicitly setting this state */ vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, VDEV_AUX_NO_REPLICAS); } else { vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS; return (lasterror); } } *asize = 0; *ashift = 0; return (0); } static void vdev_root_close(vdev_t *vd) { int c; for (c = 0; c < vd->vdev_children; c++) vdev_close(vd->vdev_child[c]); } static void vdev_root_state_change(vdev_t *vd, int faulted, int degraded) { if (faulted) { if (too_many_errors(vd, faulted)) vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, VDEV_AUX_NO_REPLICAS); else vdev_set_state(vd, B_FALSE, VDEV_STATE_FAULTED, VDEV_AUX_NO_REPLICAS); } else if (degraded) { vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE); } else { vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE); } } vdev_ops_t vdev_root_ops = { vdev_root_open, vdev_root_close, NULL, vdev_default_asize, NULL, /* io_start - not applicable to the root */ NULL, /* io_done - not applicable to the root */ vdev_root_state_change, VDEV_TYPE_ROOT, /* name of this vdev type */ B_FALSE /* not a leaf vdev */ };