Re: [f2fs-dev] [PATCH] f2fs: fix to migrate all curseg types during free_segment_range

[Chao Yu]

On 8/20/26 02:06, Daeho Jeong wrote:
> From: Daeho Jeong <daehojeong@xxxxxxxxxx>
>
> In free_segment_range(), the curseg evacuation loop only iterates up to
> NR_CURSEG_PERSIST_TYPE (0..5), missing non-persistent in-memory curseg
> types such as CURSEG_COLD_DATA_PINNED and CURSEG_ALL_DATA_ATGC.
>
> Even though these in-memory curseg types are not saved in the on-disk
> checkpoint header, they still occupy active physical segments at runtime.
> If an active in-memory curseg happens to be allocated within the segment
> range being truncated during filesystem shrink, failing to evacuate it
> will cause subsequent writes to the curseg attempting out-of-bounds I/O
> on the truncated storage range.
>
> Fix this by expanding the curseg evacuation loop upper bound to
> NR_CURSEG_TYPE to ensure all active curseg types are safely migrated
> out of the target range.
>
> Fixes: d0b9e42ab615 ("f2fs: introduce inmem curseg")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Daeho Jeong <daehojeong@xxxxxxxxxx>
> Signed-off-by: Sunmin Jeong <s_min.jeong@xxxxxxxxxxx>

Reviewed-by: Chao Yu <chao@xxxxxxxxxx>

Thanks,