1*789Sahrens /* 2*789Sahrens * CDDL HEADER START 3*789Sahrens * 4*789Sahrens * The contents of this file are subject to the terms of the 5*789Sahrens * Common Development and Distribution License, Version 1.0 only 6*789Sahrens * (the "License"). You may not use this file except in compliance 7*789Sahrens * with the License. 8*789Sahrens * 9*789Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10*789Sahrens * or http://www.opensolaris.org/os/licensing. 11*789Sahrens * See the License for the specific language governing permissions 12*789Sahrens * and limitations under the License. 13*789Sahrens * 14*789Sahrens * When distributing Covered Code, include this CDDL HEADER in each 15*789Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16*789Sahrens * If applicable, add the following below this CDDL HEADER, with the 17*789Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 18*789Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 19*789Sahrens * 20*789Sahrens * CDDL HEADER END 21*789Sahrens */ 22*789Sahrens /* 23*789Sahrens * Copyright 2005 Sun Microsystems, Inc. All rights reserved. 24*789Sahrens * Use is subject to license terms. 25*789Sahrens */ 26*789Sahrens 27*789Sahrens #pragma ident "%Z%%M% %I% %E% SMI" 28*789Sahrens 29*789Sahrens /* 30*789Sahrens * The 'missing' vdev is a special vdev type used only during import. It 31*789Sahrens * signifies a placeholder in the root vdev for some vdev that we know is 32*789Sahrens * missing. We pass it down to the kernel to allow the rest of the 33*789Sahrens * configuration to parsed and an attempt made to open all available devices. 34*789Sahrens * Because its GUID is always 0, we know that the guid sum will mismatch and we 35*789Sahrens * won't be able to open the pool anyway. 36*789Sahrens */ 37*789Sahrens 38*789Sahrens #include <sys/zfs_context.h> 39*789Sahrens #include <sys/spa.h> 40*789Sahrens #include <sys/vdev_impl.h> 41*789Sahrens #include <sys/fs/zfs.h> 42*789Sahrens #include <sys/zio.h> 43*789Sahrens 44*789Sahrens /* ARGSUSED */ 45*789Sahrens static int 46*789Sahrens vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 47*789Sahrens { 48*789Sahrens /* 49*789Sahrens * Really this should just fail. But then the root vdev will be in the 50*789Sahrens * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is 51*789Sahrens * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we 52*789Sahrens * will fail the GUID sum check before ever trying to open the pool. 53*789Sahrens */ 54*789Sahrens *psize = SPA_MINDEVSIZE; 55*789Sahrens *ashift = SPA_MINBLOCKSHIFT; 56*789Sahrens return (0); 57*789Sahrens } 58*789Sahrens 59*789Sahrens /* ARGSUSED */ 60*789Sahrens static void 61*789Sahrens vdev_missing_close(vdev_t *vd) 62*789Sahrens { 63*789Sahrens } 64*789Sahrens 65*789Sahrens /* ARGSUSED */ 66*789Sahrens static void 67*789Sahrens vdev_missing_io_start(zio_t *zio) 68*789Sahrens { 69*789Sahrens zio->io_error = ENOTSUP; 70*789Sahrens zio_next_stage_async(zio); 71*789Sahrens } 72*789Sahrens 73*789Sahrens /* ARGSUSED */ 74*789Sahrens static void 75*789Sahrens vdev_missing_io_done(zio_t *zio) 76*789Sahrens { 77*789Sahrens zio_next_stage(zio); 78*789Sahrens } 79*789Sahrens 80*789Sahrens vdev_ops_t vdev_missing_ops = { 81*789Sahrens vdev_missing_open, 82*789Sahrens vdev_missing_close, 83*789Sahrens vdev_default_asize, 84*789Sahrens vdev_missing_io_start, 85*789Sahrens vdev_missing_io_done, 86*789Sahrens NULL, 87*789Sahrens VDEV_TYPE_MISSING, /* name of this vdev type */ 88*789Sahrens B_TRUE /* leaf vdev */ 89*789Sahrens }; 90