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 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 #pragma ident "%Z%%M% %I% %E% SMI" 27 28 /* 29 * The 'missing' vdev is a special vdev type used only during import. It 30 * signifies a placeholder in the root vdev for some vdev that we know is 31 * missing. We pass it down to the kernel to allow the rest of the 32 * configuration to parsed and an attempt made to open all available devices. 33 * Because its GUID is always 0, we know that the guid sum will mismatch and we 34 * won't be able to open the pool anyway. 35 */ 36 37 #include <sys/zfs_context.h> 38 #include <sys/spa.h> 39 #include <sys/vdev_impl.h> 40 #include <sys/fs/zfs.h> 41 #include <sys/zio.h> 42 43 /* ARGSUSED */ 44 static int 45 vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 46 { 47 /* 48 * Really this should just fail. But then the root vdev will be in the 49 * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is 50 * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we 51 * will fail the GUID sum check before ever trying to open the pool. 52 */ 53 *psize = SPA_MINDEVSIZE; 54 *ashift = SPA_MINBLOCKSHIFT; 55 return (0); 56 } 57 58 /* ARGSUSED */ 59 static void 60 vdev_missing_close(vdev_t *vd) 61 { 62 } 63 64 /* ARGSUSED */ 65 static int 66 vdev_missing_io_start(zio_t *zio) 67 { 68 zio->io_error = ENOTSUP; 69 return (ZIO_PIPELINE_CONTINUE); 70 } 71 72 /* ARGSUSED */ 73 static int 74 vdev_missing_io_done(zio_t *zio) 75 { 76 return (ZIO_PIPELINE_CONTINUE); 77 } 78 79 /* ARGSUSED */ 80 static int 81 vdev_missing_probe(vdev_t *vd) 82 { 83 return (0); 84 } 85 86 vdev_ops_t vdev_missing_ops = { 87 vdev_missing_open, 88 vdev_missing_close, 89 vdev_missing_probe, 90 vdev_default_asize, 91 vdev_missing_io_start, 92 vdev_missing_io_done, 93 NULL, 94 VDEV_TYPE_MISSING, /* name of this vdev type */ 95 B_TRUE /* leaf vdev */ 96 }; 97