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btrfs: zoned: document RECLAIM_ZONES flush state

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Document the purpose of the RECLAIM_ZONES flush state.

Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Johannes Thumshirn 2026-05-22 11:02:43 +02:00 committed by Filipe Manana
parent 0eded739d8
commit 967c1716eb
1 changed files with 7 additions and 0 deletions
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7
fs/btrfs/space-info.c
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@ -1411,6 +1411,13 @@ static void btrfs_preempt_reclaim_metadata_space(struct work_struct *work)
* This is where we reclaim all of the pinned space generated by running the
* iputs
*
* RECLAIM_ZONES
* This state only works for the zoned mode. We scan the block groups in the
* reclaim_bgs_list and check if we can relocate them. If yes perform the
* relocation to garbage collect the zone. On each of these runs
* BTRFS_ZONED_SYNC_RECLAIM_BATCH (5) block-groups will be reclaimed, after all
* unused block-groups have been deleted.
*
* RESET_ZONES
* This state works only for the zoned mode. We scan the unused block group
* list and reset the zones and reuse the block group.