Re: [PATCH] ext4: fix an off-by-one issue during moving extents

[Theodore Ts'o]

On Fri, 12 Sep 2025 18:58:41 +0800, Zhang Yi wrote:
> During the movement of a written extent, mext_page_mkuptodate() is
> called to read data in the range [from, to) into the page cache and to
> update the corresponding buffers. Therefore, we should not wait on any
> buffer whose start offset is >= 'to'. Otherwise, it will return -EIO and
> fail the extents movement.
> 
>  $ for i in `seq 3 -1 0`; \
>    do xfs_io -fs -c "pwrite -b 1024 $((i * 1024)) 1024" /mnt/foo; \
>    done
>  $ umount /mnt && mount /dev/pmem1s /mnt  # drop cache
>  $ e4defrag /mnt/foo
>    e4defrag 1.47.0 (5-Feb-2023)
>    ext4 defragmentation for /mnt/foo
>    [1/1]/mnt/foo:    0%    [ NG ]
>    Success:                       [0/1]
> 
> [...]

Applied, thanks!

[1/1] ext4: fix an off-by-one issue during moving extents
      commit: 12e803c8827d049ae8f2c743ef66ab87ae898375

Best regards,
-- 
Theodore Ts'o <tytso@xxxxxxx>