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 http://www.opensolaris.org/os/licensing. 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 * Copyright 2019 Joyent, Inc. 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 /* ARGSUSED */ 47 static int 48 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, 49 uint64_t *ashift) 50 { 51 /* 52 * Really this should just fail. But then the root vdev will be in the 53 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is 54 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we 55 * will fail the GUID sum check before ever trying to open the pool. 56 */ 57 *psize = 0; 58 *max_psize = 0; 59 *ashift = 0; 60 return (0); 61 } 62 63 /* ARGSUSED */ 64 static void 65 vdev_missing_close(vdev_t *vd) 66 { 67 } 68 69 /* ARGSUSED */ 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 /* ARGSUSED */ 78 static void 79 vdev_missing_io_done(zio_t *zio) 80 { 81 } 82 83 vdev_ops_t vdev_missing_ops = { 84 .vdev_op_open = vdev_missing_open, 85 .vdev_op_close = vdev_missing_close, 86 .vdev_op_asize = vdev_default_asize, 87 .vdev_op_io_start = vdev_missing_io_start, 88 .vdev_op_io_done = vdev_missing_io_done, 89 .vdev_op_state_change = NULL, 90 .vdev_op_need_resilver = NULL, 91 .vdev_op_hold = NULL, 92 .vdev_op_rele = NULL, 93 .vdev_op_remap = NULL, 94 .vdev_op_xlate = NULL, 95 .vdev_op_dumpio = NULL, 96 .vdev_op_type = VDEV_TYPE_MISSING, /* name of this vdev type */ 97 .vdev_op_leaf = B_TRUE /* leaf vdev */ 98 }; 99 100 vdev_ops_t vdev_hole_ops = { 101 .vdev_op_open = vdev_missing_open, 102 .vdev_op_close = vdev_missing_close, 103 .vdev_op_asize = vdev_default_asize, 104 .vdev_op_io_start = vdev_missing_io_start, 105 .vdev_op_io_done = vdev_missing_io_done, 106 .vdev_op_state_change = NULL, 107 .vdev_op_need_resilver = NULL, 108 .vdev_op_hold = NULL, 109 .vdev_op_rele = NULL, 110 .vdev_op_remap = NULL, 111 .vdev_op_xlate = NULL, 112 .vdev_op_dumpio = NULL, 113 .vdev_op_type = VDEV_TYPE_HOLE, /* name of this vdev type */ 114 .vdev_op_leaf = B_TRUE /* leaf vdev */ 115 }; 116