1 // SPDX-License-Identifier: CDDL-1.0 2 /* 3 * CDDL HEADER START 4 * 5 * The contents of this file are subject to the terms of the 6 * Common Development and Distribution License (the "License"). 7 * You may not use this file except in compliance with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or https://opensource.org/licenses/CDDL-1.0. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 /* 23 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 /* 28 * Copyright (c) 2012, 2016 by Delphix. All rights reserved. 29 */ 30 31 /* 32 * The 'missing' vdev is a special vdev type used only during import. It 33 * signifies a placeholder in the root vdev for some vdev that we know is 34 * missing. We pass it down to the kernel to allow the rest of the 35 * configuration to parsed and an attempt made to open all available devices. 36 * Because its GUID is always 0, we know that the guid sum will mismatch and we 37 * won't be able to open the pool anyway. 38 */ 39 40 #include <sys/zfs_context.h> 41 #include <sys/spa.h> 42 #include <sys/vdev_impl.h> 43 #include <sys/fs/zfs.h> 44 #include <sys/zio.h> 45 46 static int 47 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, 48 uint64_t *ashift, uint64_t *pshift) 49 { 50 /* 51 * Really this should just fail. But then the root vdev will be in the 52 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is 53 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we 54 * will fail the GUID sum check before ever trying to open the pool. 55 */ 56 (void) vd; 57 *psize = 0; 58 *max_psize = 0; 59 *ashift = 0; 60 *pshift = 0; 61 return (0); 62 } 63 64 static void 65 vdev_missing_close(vdev_t *vd) 66 { 67 (void) vd; 68 } 69 70 static void 71 vdev_missing_io_start(zio_t *zio) 72 { 73 zio->io_error = SET_ERROR(ENOTSUP); 74 zio_execute(zio); 75 } 76 77 static void 78 vdev_missing_io_done(zio_t *zio) 79 { 80 (void) zio; 81 } 82 83 vdev_ops_t vdev_missing_ops = { 84 .vdev_op_init = NULL, 85 .vdev_op_fini = NULL, 86 .vdev_op_open = vdev_missing_open, 87 .vdev_op_close = vdev_missing_close, 88 .vdev_op_psize_to_asize = vdev_default_asize, 89 .vdev_op_asize_to_psize = vdev_default_psize, 90 .vdev_op_min_asize = vdev_default_min_asize, 91 .vdev_op_min_alloc = NULL, 92 .vdev_op_io_start = vdev_missing_io_start, 93 .vdev_op_io_done = vdev_missing_io_done, 94 .vdev_op_state_change = NULL, 95 .vdev_op_need_resilver = NULL, 96 .vdev_op_hold = NULL, 97 .vdev_op_rele = NULL, 98 .vdev_op_remap = NULL, 99 .vdev_op_xlate = NULL, 100 .vdev_op_rebuild_asize = NULL, 101 .vdev_op_metaslab_init = NULL, 102 .vdev_op_config_generate = NULL, 103 .vdev_op_nparity = NULL, 104 .vdev_op_ndisks = NULL, 105 .vdev_op_type = VDEV_TYPE_MISSING, /* name of this vdev type */ 106 .vdev_op_leaf = B_TRUE /* leaf vdev */ 107 }; 108 109 vdev_ops_t vdev_hole_ops = { 110 .vdev_op_init = NULL, 111 .vdev_op_fini = NULL, 112 .vdev_op_open = vdev_missing_open, 113 .vdev_op_close = vdev_missing_close, 114 .vdev_op_psize_to_asize = vdev_default_asize, 115 .vdev_op_asize_to_psize = vdev_default_psize, 116 .vdev_op_min_asize = vdev_default_min_asize, 117 .vdev_op_min_alloc = NULL, 118 .vdev_op_io_start = vdev_missing_io_start, 119 .vdev_op_io_done = vdev_missing_io_done, 120 .vdev_op_state_change = NULL, 121 .vdev_op_need_resilver = NULL, 122 .vdev_op_hold = NULL, 123 .vdev_op_rele = NULL, 124 .vdev_op_remap = NULL, 125 .vdev_op_xlate = NULL, 126 .vdev_op_rebuild_asize = NULL, 127 .vdev_op_metaslab_init = NULL, 128 .vdev_op_config_generate = NULL, 129 .vdev_op_nparity = NULL, 130 .vdev_op_ndisks = NULL, 131 .vdev_op_type = VDEV_TYPE_HOLE, /* name of this vdev type */ 132 .vdev_op_leaf = B_TRUE /* leaf vdev */ 133 }; 134