1789Sahrens /* 2789Sahrens * CDDL HEADER START 3789Sahrens * 4789Sahrens * The contents of this file are subject to the terms of the 51544Seschrock * Common Development and Distribution License (the "License"). 61544Seschrock * You may not use this file except in compliance with the License. 7789Sahrens * 8789Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9789Sahrens * or http://www.opensolaris.org/os/licensing. 10789Sahrens * See the License for the specific language governing permissions 11789Sahrens * and limitations under the License. 12789Sahrens * 13789Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14789Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15789Sahrens * If applicable, add the following below this CDDL HEADER, with the 16789Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17789Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18789Sahrens * 19789Sahrens * CDDL HEADER END 20789Sahrens */ 21789Sahrens /* 221544Seschrock * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 23789Sahrens * Use is subject to license terms. 24789Sahrens */ 25789Sahrens 26789Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 27789Sahrens 28789Sahrens #include <sys/zfs_context.h> 29789Sahrens #include <sys/spa.h> 30789Sahrens #include <sys/vdev_impl.h> 31789Sahrens #include <sys/zio.h> 32789Sahrens #include <sys/fs/zfs.h> 33789Sahrens 34789Sahrens /* 35789Sahrens * Virtual device vector for the pool's root vdev. 36789Sahrens */ 37789Sahrens 38*1775Sbillm /* 39*1775Sbillm * We should be able to tolerate one failure with absolutely no damage 40*1775Sbillm * to our metadata. Two failures will take out space maps, a bunch of 41*1775Sbillm * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy 42*1775Sbillm * place to live. When we get smarter, we can liberalize this policy. 43*1775Sbillm * e.g. If we haven't lost two consecutive top-level vdevs, then we are 44*1775Sbillm * probably fine. Adding bean counters during alloc/free can make this 45*1775Sbillm * future guesswork more accurate. 46*1775Sbillm */ 47*1775Sbillm /*ARGSUSED*/ 48*1775Sbillm static int 49*1775Sbillm too_many_errors(vdev_t *vd, int numerrors) 50*1775Sbillm { 51*1775Sbillm return (numerrors > 0); 52*1775Sbillm } 53*1775Sbillm 54789Sahrens static int 55789Sahrens vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *ashift) 56789Sahrens { 57789Sahrens vdev_t *cvd; 58789Sahrens int c, error; 59789Sahrens int lasterror = 0; 60*1775Sbillm int numerrors = 0; 61789Sahrens 62789Sahrens if (vd->vdev_children == 0) { 63789Sahrens vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 64789Sahrens return (EINVAL); 65789Sahrens } 66789Sahrens 67789Sahrens for (c = 0; c < vd->vdev_children; c++) { 68789Sahrens cvd = vd->vdev_child[c]; 69789Sahrens 70789Sahrens if ((error = vdev_open(cvd)) != 0) { 71789Sahrens lasterror = error; 72*1775Sbillm numerrors++; 73789Sahrens continue; 74789Sahrens } 75789Sahrens } 76789Sahrens 77*1775Sbillm if (too_many_errors(vd, numerrors)) { 78789Sahrens vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS; 79*1775Sbillm return (lasterror); 80*1775Sbillm } 81789Sahrens 821732Sbonwick *asize = 0; 831732Sbonwick *ashift = 0; 841732Sbonwick 85*1775Sbillm return (0); 86789Sahrens } 87789Sahrens 88789Sahrens static void 89789Sahrens vdev_root_close(vdev_t *vd) 90789Sahrens { 91789Sahrens int c; 92789Sahrens 93789Sahrens for (c = 0; c < vd->vdev_children; c++) 94789Sahrens vdev_close(vd->vdev_child[c]); 95789Sahrens } 96789Sahrens 97789Sahrens static void 98789Sahrens vdev_root_state_change(vdev_t *vd, int faulted, int degraded) 99789Sahrens { 100*1775Sbillm if (too_many_errors(vd, faulted)) 1011544Seschrock vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 1021544Seschrock VDEV_AUX_NO_REPLICAS); 103789Sahrens else if (degraded != 0) 1041544Seschrock vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE); 105789Sahrens else 1061544Seschrock vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE); 107789Sahrens } 108789Sahrens 109789Sahrens vdev_ops_t vdev_root_ops = { 110789Sahrens vdev_root_open, 111789Sahrens vdev_root_close, 112789Sahrens vdev_default_asize, 113789Sahrens NULL, /* io_start - not applicable to the root */ 114789Sahrens NULL, /* io_done - not applicable to the root */ 115789Sahrens vdev_root_state_change, 116789Sahrens VDEV_TYPE_ROOT, /* name of this vdev type */ 117789Sahrens B_FALSE /* not a leaf vdev */ 118789Sahrens }; 119