diff options
Diffstat (limited to 'sys/contrib/openzfs/module/zfs/vdev_missing.c')
| -rw-r--r-- | sys/contrib/openzfs/module/zfs/vdev_missing.c | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/sys/contrib/openzfs/module/zfs/vdev_missing.c b/sys/contrib/openzfs/module/zfs/vdev_missing.c new file mode 100644 index 000000000000..c62faef2d05c --- /dev/null +++ b/sys/contrib/openzfs/module/zfs/vdev_missing.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: CDDL-1.0 +/* + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License (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 https://opensource.org/licenses/CDDL-1.0. + * 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 2010 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +/* + * Copyright (c) 2012, 2016 by Delphix. All rights reserved. + */ + +/* + * 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> + +static int +vdev_missing_open(vdev_t *vd, uint64_t *psize, uint64_t *max_psize, + uint64_t *ashift, uint64_t *pshift) +{ + /* + * 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. + */ + (void) vd; + *psize = 0; + *max_psize = 0; + *ashift = 0; + *pshift = 0; + return (0); +} + +static void +vdev_missing_close(vdev_t *vd) +{ + (void) vd; +} + +static void +vdev_missing_io_start(zio_t *zio) +{ + zio->io_error = SET_ERROR(ENOTSUP); + zio_execute(zio); +} + +static void +vdev_missing_io_done(zio_t *zio) +{ + (void) zio; +} + +vdev_ops_t vdev_missing_ops = { + .vdev_op_init = NULL, + .vdev_op_fini = NULL, + .vdev_op_open = vdev_missing_open, + .vdev_op_close = vdev_missing_close, + .vdev_op_psize_to_asize = vdev_default_asize, + .vdev_op_asize_to_psize = vdev_default_psize, + .vdev_op_min_asize = vdev_default_min_asize, + .vdev_op_min_alloc = NULL, + .vdev_op_io_start = vdev_missing_io_start, + .vdev_op_io_done = vdev_missing_io_done, + .vdev_op_state_change = NULL, + .vdev_op_need_resilver = NULL, + .vdev_op_hold = NULL, + .vdev_op_rele = NULL, + .vdev_op_remap = NULL, + .vdev_op_xlate = NULL, + .vdev_op_rebuild_asize = NULL, + .vdev_op_metaslab_init = NULL, + .vdev_op_config_generate = NULL, + .vdev_op_nparity = NULL, + .vdev_op_ndisks = NULL, + .vdev_op_type = VDEV_TYPE_MISSING, /* name of this vdev type */ + .vdev_op_leaf = B_TRUE /* leaf vdev */ +}; + +vdev_ops_t vdev_hole_ops = { + .vdev_op_init = NULL, + .vdev_op_fini = NULL, + .vdev_op_open = vdev_missing_open, + .vdev_op_close = vdev_missing_close, + .vdev_op_psize_to_asize = vdev_default_asize, + .vdev_op_asize_to_psize = vdev_default_psize, + .vdev_op_min_asize = vdev_default_min_asize, + .vdev_op_min_alloc = NULL, + .vdev_op_io_start = vdev_missing_io_start, + .vdev_op_io_done = vdev_missing_io_done, + .vdev_op_state_change = NULL, + .vdev_op_need_resilver = NULL, + .vdev_op_hold = NULL, + .vdev_op_rele = NULL, + .vdev_op_remap = NULL, + .vdev_op_xlate = NULL, + .vdev_op_rebuild_asize = NULL, + .vdev_op_metaslab_init = NULL, + .vdev_op_config_generate = NULL, + .vdev_op_nparity = NULL, + .vdev_op_ndisks = NULL, + .vdev_op_type = VDEV_TYPE_HOLE, /* name of this vdev type */ + .vdev_op_leaf = B_TRUE /* leaf vdev */ +}; |