1789Sahrens /* 2789Sahrens * CDDL HEADER START 3789Sahrens * 4789Sahrens * The contents of this file are subject to the terms of the 55329Sgw25295 * Common Development and Distribution License (the "License"). 65329Sgw25295 * You may not use this file except in compliance with the License. 7789Sahrens * 8789Sahrens * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9789Sahrens * or http://www.opensolaris.org/os/licensing. 10789Sahrens * See the License for the specific language governing permissions 11789Sahrens * and limitations under the License. 12789Sahrens * 13789Sahrens * When distributing Covered Code, include this CDDL HEADER in each 14789Sahrens * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15789Sahrens * If applicable, add the following below this CDDL HEADER, with the 16789Sahrens * fields enclosed by brackets "[]" replaced with your own identifying 17789Sahrens * information: Portions Copyright [yyyy] [name of copyright owner] 18789Sahrens * 19789Sahrens * CDDL HEADER END 20789Sahrens */ 21789Sahrens /* 22*7754SJeff.Bonwick@Sun.COM * Copyright 2008 Sun Microsystems, Inc. All rights reserved. 23789Sahrens * Use is subject to license terms. 24789Sahrens */ 25789Sahrens 26789Sahrens /* 27789Sahrens * The 'missing' vdev is a special vdev type used only during import. It 28789Sahrens * signifies a placeholder in the root vdev for some vdev that we know is 29789Sahrens * missing. We pass it down to the kernel to allow the rest of the 30789Sahrens * configuration to parsed and an attempt made to open all available devices. 31789Sahrens * Because its GUID is always 0, we know that the guid sum will mismatch and we 32789Sahrens * won't be able to open the pool anyway. 33789Sahrens */ 34789Sahrens 35789Sahrens #include <sys/zfs_context.h> 36789Sahrens #include <sys/spa.h> 37789Sahrens #include <sys/vdev_impl.h> 38789Sahrens #include <sys/fs/zfs.h> 39789Sahrens #include <sys/zio.h> 40789Sahrens 41789Sahrens /* ARGSUSED */ 42789Sahrens static int 43789Sahrens vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) 44789Sahrens { 45789Sahrens /* 46789Sahrens * Really this should just fail. But then the root vdev will be in the 47789Sahrens * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is 48789Sahrens * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we 49789Sahrens * will fail the GUID sum check before ever trying to open the pool. 50789Sahrens */ 51789Sahrens *psize = SPA_MINDEVSIZE; 52789Sahrens *ashift = SPA_MINBLOCKSHIFT; 53789Sahrens return (0); 54789Sahrens } 55789Sahrens 56789Sahrens /* ARGSUSED */ 57789Sahrens static void 58789Sahrens vdev_missing_close(vdev_t *vd) 59789Sahrens { 60789Sahrens } 61789Sahrens 62789Sahrens /* ARGSUSED */ 635530Sbonwick static int 64789Sahrens vdev_missing_io_start(zio_t *zio) 65789Sahrens { 66789Sahrens zio->io_error = ENOTSUP; 675530Sbonwick return (ZIO_PIPELINE_CONTINUE); 68789Sahrens } 69789Sahrens 70789Sahrens /* ARGSUSED */ 71*7754SJeff.Bonwick@Sun.COM static void 72789Sahrens vdev_missing_io_done(zio_t *zio) 73789Sahrens { 745329Sgw25295 } 755329Sgw25295 76789Sahrens vdev_ops_t vdev_missing_ops = { 77789Sahrens vdev_missing_open, 78789Sahrens vdev_missing_close, 79789Sahrens vdev_default_asize, 80789Sahrens vdev_missing_io_start, 81789Sahrens vdev_missing_io_done, 82789Sahrens NULL, 83789Sahrens VDEV_TYPE_MISSING, /* name of this vdev type */ 84789Sahrens B_TRUE /* leaf vdev */ 85789Sahrens }; 86