1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or https://opensource.org/licenses/CDDL-1.0. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 /* 27 * Copyright (c) 2012, 2016 by Delphix. All rights reserved. 28 */ 29 30 #include <sys/zfs_context.h> 31 #include <sys/spa.h> 32 #include <sys/vdev_impl.h> 33 #include <sys/zio.h> 34 #include <sys/fs/zfs.h> 35 36 /* 37 * Virtual device vector for the pool's root vdev. 38 */ 39 40 static uint64_t 41 vdev_root_core_tvds(vdev_t *vd) 42 { 43 uint64_t tvds = 0; 44 45 for (uint64_t c = 0; c < vd->vdev_children; c++) { 46 vdev_t *cvd = vd->vdev_child[c]; 47 48 if (!cvd->vdev_ishole && !cvd->vdev_islog && 49 cvd->vdev_ops != &vdev_indirect_ops) { 50 tvds++; 51 } 52 } 53 54 return (tvds); 55 } 56 57 /* 58 * We should be able to tolerate one failure with absolutely no damage 59 * to our metadata. Two failures will take out space maps, a bunch of 60 * indirect block trees, meta dnodes, dnodes, etc. Probably not a happy 61 * place to live. When we get smarter, we can liberalize this policy. 62 * e.g. If we haven't lost two consecutive top-level vdevs, then we are 63 * probably fine. Adding bean counters during alloc/free can make this 64 * future guesswork more accurate. 65 */ 66 static boolean_t 67 too_many_errors(vdev_t *vd, uint64_t numerrors) 68 { 69 uint64_t tvds; 70 71 if (numerrors == 0) 72 return (B_FALSE); 73 74 tvds = vdev_root_core_tvds(vd); 75 ASSERT3U(numerrors, <=, tvds); 76 77 if (numerrors == tvds) 78 return (B_TRUE); 79 80 return (numerrors > spa_missing_tvds_allowed(vd->vdev_spa)); 81 } 82 83 static int 84 vdev_root_open(vdev_t *vd, uint64_t *asize, uint64_t *max_asize, 85 uint64_t *ashift, uint64_t *pshift) 86 { 87 spa_t *spa = vd->vdev_spa; 88 int lasterror = 0; 89 int numerrors = 0; 90 91 if (vd->vdev_children == 0) { 92 vd->vdev_stat.vs_aux = VDEV_AUX_BAD_LABEL; 93 return (SET_ERROR(EINVAL)); 94 } 95 96 vdev_open_children(vd); 97 98 for (int c = 0; c < vd->vdev_children; c++) { 99 vdev_t *cvd = vd->vdev_child[c]; 100 101 if (cvd->vdev_open_error && !cvd->vdev_islog && 102 cvd->vdev_ops != &vdev_indirect_ops) { 103 lasterror = cvd->vdev_open_error; 104 numerrors++; 105 } 106 } 107 108 if (spa_load_state(spa) != SPA_LOAD_NONE) 109 spa_set_missing_tvds(spa, numerrors); 110 111 if (too_many_errors(vd, numerrors)) { 112 vd->vdev_stat.vs_aux = VDEV_AUX_NO_REPLICAS; 113 return (lasterror); 114 } 115 116 *asize = 0; 117 *max_asize = 0; 118 *ashift = 0; 119 *pshift = 0; 120 121 return (0); 122 } 123 124 static void 125 vdev_root_close(vdev_t *vd) 126 { 127 for (int c = 0; c < vd->vdev_children; c++) 128 vdev_close(vd->vdev_child[c]); 129 } 130 131 static void 132 vdev_root_state_change(vdev_t *vd, int faulted, int degraded) 133 { 134 if (too_many_errors(vd, faulted)) { 135 vdev_set_state(vd, B_FALSE, VDEV_STATE_CANT_OPEN, 136 VDEV_AUX_NO_REPLICAS); 137 } else if (degraded || faulted) { 138 vdev_set_state(vd, B_FALSE, VDEV_STATE_DEGRADED, VDEV_AUX_NONE); 139 } else { 140 vdev_set_state(vd, B_FALSE, VDEV_STATE_HEALTHY, VDEV_AUX_NONE); 141 } 142 } 143 144 vdev_ops_t vdev_root_ops = { 145 .vdev_op_init = NULL, 146 .vdev_op_fini = NULL, 147 .vdev_op_open = vdev_root_open, 148 .vdev_op_close = vdev_root_close, 149 .vdev_op_asize = vdev_default_asize, 150 .vdev_op_min_asize = vdev_default_min_asize, 151 .vdev_op_min_alloc = NULL, 152 .vdev_op_io_start = NULL, /* not applicable to the root */ 153 .vdev_op_io_done = NULL, /* not applicable to the root */ 154 .vdev_op_state_change = vdev_root_state_change, 155 .vdev_op_need_resilver = NULL, 156 .vdev_op_hold = NULL, 157 .vdev_op_rele = NULL, 158 .vdev_op_remap = NULL, 159 .vdev_op_xlate = NULL, 160 .vdev_op_rebuild_asize = NULL, 161 .vdev_op_metaslab_init = NULL, 162 .vdev_op_config_generate = NULL, 163 .vdev_op_nparity = NULL, 164 .vdev_op_ndisks = NULL, 165 .vdev_op_type = VDEV_TYPE_ROOT, /* name of this vdev type */ 166 .vdev_op_leaf = B_FALSE /* not a leaf vdev */ 167 }; 168