btrfs: zoned: reserve data_reloc block group on mount

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Create a block group dedicated for data relocation on mount of a zoned
filesystem.

If there is already more than one empty DATA block group on mount, this
one is picked for the data relocation block group, instead of a newly
created one.

This is done to ensure, there is always space for performing garbage
collection and the filesystem is not hitting ENOSPC under heavy overwrite
workloads.

CC: stable@vger.kernel.org # 6.6+
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Johannes Thumshirn 2025-06-03 08:14:01 +02:00 • committed by David Sterba

parent f1f22dfbea

commit 694ce5e143

3 changed files with 65 additions and 0 deletions

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1

fs/btrfs/disk-io.c

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61

fs/btrfs/zoned.c

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3

fs/btrfs/zoned.h

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