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, 2014 by Delphix. All rights reserved. 28 */ 29 30/* 31 * The 'missing' vdev is a special vdev type used only during import. It 32 * signifies a placeholder in the root vdev for some vdev that we know is 33 * missing. We pass it down to the kernel to allow the rest of the 34 * configuration to parsed and an attempt made to open all available devices. 35 * Because its GUID is always 0, we know that the guid sum will mismatch and we 36 * won't be able to open the pool anyway. 37 */ 38 39#include <sys/zfs_context.h> 40#include <sys/spa.h> 41#include <sys/vdev_impl.h> 42#include <sys/fs/zfs.h> 43#include <sys/zio.h> 44 45/* ARGSUSED */ 46static int 47vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, 48 uint64_t *logical_ashift, uint64_t *physical_ashift) 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 *psize = 0; 57 *max_psize = 0; 58 *logical_ashift = 0; 59 *physical_ashift = 0; 60 return (0); 61} 62 63/* ARGSUSED */ 64static void 65vdev_missing_close(vdev_t *vd) 66{ 67} 68 69/* ARGSUSED */ 70static void 71vdev_missing_io_start(zio_t *zio) 72{ 73 zio->io_error = SET_ERROR(ENOTSUP); 74 zio_execute(zio); 75} 76 77/* ARGSUSED */ 78static void 79vdev_missing_io_done(zio_t *zio) 80{ 81} 82 83vdev_ops_t vdev_missing_ops = { 84 vdev_missing_open, 85 vdev_missing_close, 86 vdev_default_asize, 87 vdev_missing_io_start, 88 vdev_missing_io_done, 89 NULL, 90 NULL, 91 NULL, 92 VDEV_TYPE_MISSING, /* name of this vdev type */ 93 B_TRUE /* leaf vdev */ 94}; 95 96vdev_ops_t vdev_hole_ops = { 97 vdev_missing_open, 98 vdev_missing_close, 99 vdev_default_asize, 100 vdev_missing_io_start, 101 vdev_missing_io_done, 102 NULL, 103 NULL, 104 NULL, 105 VDEV_TYPE_HOLE, /* name of this vdev type */ 106 B_TRUE /* leaf vdev */ 107}; 108