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, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 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 2005 Sun Microsystems, Inc. All rights reserved. 24 * Use is subject to license terms. 25 */ 26 27 #pragma ident "%Z%%M% %I% %E% SMI" 28 29 /* 30 * The 'missing' vdev is a special vdev type used only during import. It 31 * signifies a placeholder in the root vdev for some vdev that we know is 32 * missing. We pass it down to the kernel to allow the rest of the 33 * configuration to parsed and an attempt made to open all available devices. 34 * Because its GUID is always 0, we know that the guid sum will mismatch and we 35 * won't be able to open the pool anyway. 36 */ 37 38 #include <sys/zfs_context.h> 39 #include <sys/spa.h> 40 #include <sys/vdev_impl.h> 41 #include <sys/fs/zfs.h> 42 #include <sys/zio.h> 43 44 /* ARGSUSED */ 45 static int 46 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 47 { 48 /* 49 * Really this should just fail. But then the root vdev will be in the 50 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is 51 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we 52 * will fail the GUID sum check before ever trying to open the pool. 53 */ 54 *psize = SPA_MINDEVSIZE; 55 *ashift = SPA_MINBLOCKSHIFT; 56 return (0); 57 } 58 59 /* ARGSUSED */ 60 static void 61 vdev_missing_close(vdev_t *vd) 62 { 63 } 64 65 /* ARGSUSED */ 66 static void 67 vdev_missing_io_start(zio_t *zio) 68 { 69 zio->io_error = ENOTSUP; 70 zio_next_stage_async(zio); 71 } 72 73 /* ARGSUSED */ 74 static void 75 vdev_missing_io_done(zio_t *zio) 76 { 77 zio_next_stage(zio); 78 } 79 80 vdev_ops_t vdev_missing_ops = { 81 vdev_missing_open, 82 vdev_missing_close, 83 vdev_default_asize, 84 vdev_missing_io_start, 85 vdev_missing_io_done, 86 NULL, 87 VDEV_TYPE_MISSING, /* name of this vdev type */ 88 B_TRUE /* leaf vdev */ 89 }; 90