1fa9e4066Sahrens /* 2fa9e4066Sahrens * CDDL HEADER START 3fa9e4066Sahrens * 4fa9e4066Sahrens * The contents of this file are subject to the terms of the 5ea8dc4b6Seschrock * Common Development and Distribution License (the "License"). 6ea8dc4b6Seschrock * You may not use this file except in compliance with the License. 7fa9e4066Sahrens * 8fa9e4066Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9fa9e4066Sahrens * or http://www.opensolaris.org/os/licensing. 10fa9e4066Sahrens * See the License for the specific language governing permissions 11fa9e4066Sahrens * and limitations under the License. 12fa9e4066Sahrens * 13fa9e4066Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14fa9e4066Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15fa9e4066Sahrens * If applicable, add the following below this CDDL HEADER, with the 16fa9e4066Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17fa9e4066Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18fa9e4066Sahrens * 19fa9e4066Sahrens * CDDL HEADER END 20fa9e4066Sahrens */ 21fa9e4066Sahrens /* 22*f64c0e34SEric Taylor * Copyright 2009 Sun Microsystems, Inc. All rights reserved. 23fa9e4066Sahrens * Use is subject to license terms. 24fa9e4066Sahrens */ 25fa9e4066Sahrens 26fa9e4066Sahrens #include <sys/zfs_context.h> 27fa9e4066Sahrens #include <sys/spa.h> 28fa9e4066Sahrens #include <sys/vdev_impl.h> 29fa9e4066Sahrens #include <sys/zio.h> 30fa9e4066Sahrens #include <sys/fs/zfs.h> 31fa9e4066Sahrens 32fa9e4066Sahrens /* 33fa9e4066Sahrens * Virtual device vector for the pool's root vdev. 34fa9e4066Sahrens */ 35fa9e4066Sahrens 3644cd46caSbillm /* 3744cd46caSbillm * We should be able to tolerate one failure with absolutely no damage 3844cd46caSbillm * to our metadata. Two failures will take out space maps, a bunch of 3944cd46caSbillm * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy 4044cd46caSbillm * place to live. When we get smarter, we can liberalize this policy. 4144cd46caSbillm * e.g. If we haven't lost two consecutive top-level vdevs, then we are 4244cd46caSbillm * probably fine. Adding bean counters during alloc/free can make this 4344cd46caSbillm * future guesswork more accurate. 4444cd46caSbillm */ 4544cd46caSbillm static int 4644cd46caSbillm too_many_errors(vdev_t *vd, int numerrors) 4744cd46caSbillm { 480a4e9518Sgw ASSERT3U(numerrors, <=, vd->vdev_children); 4951ece835Seschrock return (numerrors > 0); 5044cd46caSbillm } 5144cd46caSbillm 52fa9e4066Sahrens static int 53fa9e4066Sahrens vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *ashift) 54fa9e4066Sahrens { 55fa9e4066Sahrens int lasterror = 0; 5644cd46caSbillm int numerrors = 0; 57fa9e4066Sahrens 58fa9e4066Sahrens if (vd->vdev_children == 0) { 59fa9e4066Sahrens vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 60fa9e4066Sahrens return (EINVAL); 61fa9e4066Sahrens } 62fa9e4066Sahrens 63*f64c0e34SEric Taylor vdev_open_children(vd); 64*f64c0e34SEric Taylor 65*f64c0e34SEric Taylor for (int c = 0; c < vd->vdev_children; c++) { 660a4e9518Sgw vdev_t *cvd = vd->vdev_child[c]; 67fa9e4066Sahrens 68*f64c0e34SEric Taylor if (cvd->vdev_open_error && !cvd->vdev_islog) { 69*f64c0e34SEric Taylor lasterror = cvd->vdev_open_error; 7044cd46caSbillm numerrors++; 71fa9e4066Sahrens } 72fa9e4066Sahrens } 73fa9e4066Sahrens 7451ece835Seschrock if (too_many_errors(vd, numerrors)) { 7551ece835Seschrock vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS; 7651ece835Seschrock return (lasterror); 7744cd46caSbillm } 78fa9e4066Sahrens 79ecc2d604Sbonwick *asize = 0; 80ecc2d604Sbonwick *ashift = 0; 81ecc2d604Sbonwick 8244cd46caSbillm return (0); 83fa9e4066Sahrens } 84fa9e4066Sahrens 85fa9e4066Sahrens static void 86fa9e4066Sahrens vdev_root_close(vdev_t *vd) 87fa9e4066Sahrens { 88*f64c0e34SEric Taylor for (int c = 0; c < vd->vdev_children; c++) 89fa9e4066Sahrens vdev_close(vd->vdev_child[c]); 90fa9e4066Sahrens } 91fa9e4066Sahrens 92fa9e4066Sahrens static void 93fa9e4066Sahrens vdev_root_state_change(vdev_t *vd, int faulted, int degraded) 94fa9e4066Sahrens { 9551ece835Seschrock if (too_many_errors(vd, faulted)) { 9651ece835Seschrock vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 9751ece835Seschrock VDEV_AUX_NO_REPLICAS); 980a4e9518Sgw } else if (degraded) { 99ea8dc4b6Seschrock vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE); 1000a4e9518Sgw } else { 101ea8dc4b6Seschrock vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE); 1020a4e9518Sgw } 103fa9e4066Sahrens } 104fa9e4066Sahrens 105fa9e4066Sahrens vdev_ops_t vdev_root_ops = { 106fa9e4066Sahrens vdev_root_open, 107fa9e4066Sahrens vdev_root_close, 108fa9e4066Sahrens vdev_default_asize, 109fa9e4066Sahrens NULL, /* io_start - not applicable to the root */ 110fa9e4066Sahrens NULL, /* io_done - not applicable to the root */ 111fa9e4066Sahrens vdev_root_state_change, 112fa9e4066Sahrens VDEV_TYPE_ROOT, /* name of this vdev type */ 113fa9e4066Sahrens B_FALSE /* not a leaf vdev */ 114fa9e4066Sahrens }; 115