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 * The 'missing' vdev is a special vdev type used only during import. It 28 * signifies a placeholder in the root vdev for some vdev that we know is 29 * missing. We pass it down to the kernel to allow the rest of the 30 * configuration to parsed and an attempt made to open all available devices. 31 * Because its GUID is always 0, we know that the guid sum will mismatch and we 32 * won't be able to open the pool anyway. 33 */ 34 35 #include <sys/zfs_context.h> 36 #include <sys/spa.h> 37 #include <sys/vdev_impl.h> 38 #include <sys/fs/zfs.h> 39 #include <sys/zio.h> 40 41 /* ARGSUSED */ 42 static int 43 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 44 { 45 /* 46 * Really this should just fail. But then the root vdev will be in the 47 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is 48 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we 49 * will fail the GUID sum check before ever trying to open the pool. 50 */ 51 *psize = 0; 52 *ashift = 0; 53 return (0); 54 } 55 56 /* ARGSUSED */ 57 static void 58 vdev_missing_close(vdev_t *vd) 59 { 60 } 61 62 /* ARGSUSED */ 63 static int 64 vdev_missing_io_start(zio_t *zio) 65 { 66 zio->io_error = ENOTSUP; 67 return (ZIO_PIPELINE_CONTINUE); 68 } 69 70 /* ARGSUSED */ 71 static void 72 vdev_missing_io_done(zio_t *zio) 73 { 74 } 75 76 vdev_ops_t vdev_missing_ops = { 77 vdev_missing_open, 78 vdev_missing_close, 79 vdev_default_asize, 80 vdev_missing_io_start, 81 vdev_missing_io_done, 82 NULL, 83 NULL, 84 NULL, 85 VDEV_TYPE_MISSING, /* name of this vdev type */ 86 B_TRUE /* leaf vdev */ 87 }; 88 89 vdev_ops_t vdev_hole_ops = { 90 vdev_missing_open, 91 vdev_missing_close, 92 vdev_default_asize, 93 vdev_missing_io_start, 94 vdev_missing_io_done, 95 NULL, 96 NULL, 97 NULL, 98 VDEV_TYPE_HOLE, /* name of this vdev type */ 99 B_TRUE /* leaf vdev */ 100 }; 101