diff options
Diffstat (limited to 'sys/contrib/opensolaris/uts/common/fs/zfs/vdev_missing.c')
-rw-r--r-- | sys/contrib/opensolaris/uts/common/fs/zfs/vdev_missing.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_missing.c b/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_missing.c new file mode 100644 index 0000000..b35f4a5 --- /dev/null +++ b/sys/contrib/opensolaris/uts/common/fs/zfs/vdev_missing.c @@ -0,0 +1,89 @@ +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * When distributing Covered Code, include this CDDL HEADER in each + * file and include the License file at usr/src/OPENSOLARIS.LICENSE. + * If applicable, add the following below this CDDL HEADER, with the + * fields enclosed by brackets "[]" replaced with your own identifying + * information: Portions Copyright [yyyy] [name of copyright owner] + * + * CDDL HEADER END + */ +/* + * Copyright 2005 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#pragma ident "%Z%%M% %I% %E% SMI" + +/* + * The 'missing' vdev is a special vdev type used only during import. It + * signifies a placeholder in the root vdev for some vdev that we know is + * missing. We pass it down to the kernel to allow the rest of the + * configuration to parsed and an attempt made to open all available devices. + * Because its GUID is always 0, we know that the guid sum will mismatch and we + * won't be able to open the pool anyway. + */ + +#include <sys/zfs_context.h> +#include <sys/spa.h> +#include <sys/vdev_impl.h> +#include <sys/fs/zfs.h> +#include <sys/zio.h> + +/* ARGSUSED */ +static int +vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *ashift) +{ + /* + * Really this should just fail. But then the root vdev will be in the + * faulted state with VDEV_AUX_NO_REPLICAS, when what we really want is + * VDEV_AUX_BAD_GUID_SUM. So we pretend to succeed, knowing that we + * will fail the GUID sum check before ever trying to open the pool. + */ + *psize = SPA_MINDEVSIZE; + *ashift = SPA_MINBLOCKSHIFT; + return (0); +} + +/* ARGSUSED */ +static void +vdev_missing_close(vdev_t *vd) +{ +} + +/* ARGSUSED */ +static void +vdev_missing_io_start(zio_t *zio) +{ + zio->io_error = ENOTSUP; + zio_next_stage_async(zio); +} + +/* ARGSUSED */ +static void +vdev_missing_io_done(zio_t *zio) +{ + zio_next_stage(zio); +} + +vdev_ops_t vdev_missing_ops = { + vdev_missing_open, + vdev_missing_close, + vdev_default_asize, + vdev_missing_io_start, + vdev_missing_io_done, + NULL, + VDEV_TYPE_MISSING, /* name of this vdev type */ + B_TRUE /* leaf vdev */ +}; |