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If the zfs_remove_max_segment tunable is changed to be not a multiple of
the sector size, then the device removal code will malfunction and try
to create mappings that are smaller than one sector, leading to a panic.
On debug bits this assertion will fail in spa_vdev_copy_segment():
ASSERT3U(DVA_GET_ASIZE(&dst), ==, size);
On nondebug, the system panics with a stack like:
metaslab_free_concrete()
metaslab_free_impl()
metaslab_free_impl_cb()
vdev_indirect_remap()
free_from_removing_vdev()
metaslab_free_impl()
metaslab_free_dva()
metaslab_free()
Fortunately, the default for zfs_remove_max_segment is 1MB, so this
can't occur by default. We hit it during this test because
removal_remap.ksh changes zfs_remove_max_segment to 1KB. When testing on
4KB-sector disks, we hit the bug.
This change makes the zfs_remove_max_segment tunable more robust,
automatically rounding it up to a multiple of the sector size. We also
turn some key assertions into VERIFY's so that similar bugs would be
caught before they are encoded on disk (and thus avoid a
panic-reboot-loop).
Reviewed-by: Sean Eric Fagan <sef@ixsystems.com>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed-by: Serapheim Dimitropoulos <serapheim@delphix.com>
Reviewed-by: Sebastien Roy <sebastien.roy@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
External-issue: DLPX-61342
Closes #8893
97 lines
2.6 KiB
C
97 lines
2.6 KiB
C
/*
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* CDDL HEADER START
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*
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* This file and its contents are supplied under the terms of the
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* Common Development and Distribution License ("CDDL"), version 1.0.
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* You may only use this file in accordance with the terms of version
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* 1.0 of the CDDL.
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*
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* A full copy of the text of the CDDL should have accompanied this
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* source. A copy of the CDDL is also available via the Internet at
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* http://www.illumos.org/license/CDDL.
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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) 2014, 2019 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_VDEV_REMOVAL_H
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#define _SYS_VDEV_REMOVAL_H
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#include <sys/spa.h>
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#include <sys/bpobj.h>
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#include <sys/vdev_indirect_mapping.h>
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#include <sys/vdev_indirect_births.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef struct spa_vdev_removal {
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uint64_t svr_vdev_id;
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uint64_t svr_max_offset_to_sync[TXG_SIZE];
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/* Thread performing a vdev removal. */
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kthread_t *svr_thread;
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/* Segments left to copy from the current metaslab. */
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range_tree_t *svr_allocd_segs;
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kmutex_t svr_lock;
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kcondvar_t svr_cv;
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boolean_t svr_thread_exit;
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/*
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* New mappings to write out each txg.
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*/
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list_t svr_new_segments[TXG_SIZE];
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/*
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* Ranges that were freed while a mapping was in flight. This is
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* a subset of the ranges covered by vdev_im_new_segments.
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*/
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range_tree_t *svr_frees[TXG_SIZE];
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/*
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* Number of bytes which we have finished our work for
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* in each txg. This could be data copied (which will be part of
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* the mappings in vdev_im_new_segments), or data freed before
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* we got around to copying it.
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*/
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uint64_t svr_bytes_done[TXG_SIZE];
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/* List of leaf zap objects to be unlinked */
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nvlist_t *svr_zaplist;
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} spa_vdev_removal_t;
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typedef struct spa_condensing_indirect {
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/*
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* New mappings to write out each txg.
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*/
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list_t sci_new_mapping_entries[TXG_SIZE];
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vdev_indirect_mapping_t *sci_new_mapping;
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} spa_condensing_indirect_t;
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extern int spa_remove_init(spa_t *);
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extern void spa_restart_removal(spa_t *);
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extern int spa_condense_init(spa_t *);
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extern void spa_condense_fini(spa_t *);
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extern void spa_start_indirect_condensing_thread(spa_t *);
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extern void spa_vdev_condense_suspend(spa_t *);
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extern int spa_vdev_remove(spa_t *, uint64_t, boolean_t);
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extern void free_from_removing_vdev(vdev_t *, uint64_t, uint64_t);
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extern int spa_removal_get_stats(spa_t *, pool_removal_stat_t *);
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extern void svr_sync(spa_t *, dmu_tx_t *);
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extern void spa_vdev_remove_suspend(spa_t *);
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extern int spa_vdev_remove_cancel(spa_t *);
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extern void spa_vdev_removal_destroy(spa_vdev_removal_t *);
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extern uint64_t spa_remove_max_segment(spa_t *);
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extern int vdev_removal_max_span;
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SYS_VDEV_REMOVAL_H */
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