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MorganaFuture
50557cc803
zpool initialize writes a non-zero pattern (0xdeadbeefdeadbeee) to free space. The pattern can be changed globally with the zfs_initialize_value module parameter, but there was no per-command way to zero free space, which is what is wanted to reclaim thinly provisioned backing storage. Add a -z/--zero flag to "zpool initialize" that writes zeroes for that run. The fill value is threaded from the CLI through libzfs and the POOL_INITIALIZE ioctl into vdev_initialize(), and is recorded in the leaf ZAP so a run that is suspended and resumed (including across export and import) keeps writing the same value. When no value is supplied the zfs_initialize_value default is used, preserving existing behavior. -z is only valid when starting initialization. The zpool-initialize(8) page notes that -z targets backing storage which does not support TRIM and points at zpool-trim(8) as the more efficient option when the device does support it; zfs.4 documents zfs_initialize_value as the default fill value. Add a zpool_initialize_zero test that pre-fills a device, runs "initialize -z", and checks its free space is zeroed and the chosen value is persisted, and cover the optional ZPOOL_INITIALIZE_VALUE ioctl key in test_vdev_initialize(). Reviewed-by: Brian Behlendorf <[email protected]> Reviewed-by: Alexander Motin <[email protected]> Reviewed-by: Akash B <[email protected]> Signed-off-by: MorganaFuture <[email protected]> Closes #16778 Closes #18765
51 lines
1.5 KiB
C
51 lines
1.5 KiB
C
// SPDX-License-Identifier: CDDL-1.0
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/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright (c) 2016 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_VDEV_INITIALIZE_H
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#define _SYS_VDEV_INITIALIZE_H
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#include <sys/spa.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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extern void vdev_initialize(vdev_t *vd, uint64_t value,
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boolean_t value_provided);
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extern void vdev_uninitialize(vdev_t *vd);
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extern void vdev_initialize_stop(vdev_t *vd,
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vdev_initializing_state_t tgt_state, list_t *vd_list);
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extern void vdev_initialize_stop_all(vdev_t *vd,
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vdev_initializing_state_t tgt_state);
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extern void vdev_initialize_stop_wait(spa_t *spa, list_t *vd_list);
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extern void vdev_initialize_restart(vdev_t *vd);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_VDEV_INITIALIZE_H */
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