Re: [PATCH] iomap: only follow dio alignment requirement if specified

["Pankaj Raghav (Samsung)" <pankaj.raghav@linux.dev>]

Hi Qu,

On Mon, Oct 26, 2026 at 05:18:13PM +1030, Qu Wenruo wrote:
> [BUG]
> After commit 4025185cf953 ("iomap: follow the alignment requirement for
> iomap_dio_hole_iter()"), generic/091 fails on both xfs and ext4:
> 
>  FSTYP         -- ext4
>  PLATFORM      -- Linux/x86_64 btrfs-vm 7.3.0-custom+ #6 SMP PREEMPT_DYNAMIC Mon Oct 26 16:04:56 ACDT 2026
>  MKFS_OPTIONS  -- -F /dev/mapper/test-scratch1
>  MOUNT_OPTIONS -- -o acl,user_xattr /dev/mapper/test-scratch1 /mnt/scratch
> 
>  generic/091  6s ... [failed, exit status 1]- output mismatch (see /home/adam/xfstests/results//generic/091.out.bad)
>      --- /home/adam/xfstests/tests/generic/091.out	2022-05-11 11:25:30.766666664 +0930
>      +++ /home/adam/xfstests/results//generic/091.out.bad	2026-10-26 16:43:49.387401669 +1030
>      @@ -1,7 +1,25 @@
>       QA output created by 091
>       fsx -N 10000 -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z -R -W
>      -fsx -N 10000 -o 8192 -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z -R -W
>      -fsx -N 10000 -o 32768 -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z -R -W
>      -fsx -N 10000 -o 8192 -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z -R -W
>      -fsx -N 10000 -o 32768 -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z -R -W
>      -fsx -N 10000 -o 128000 -l 500000 -r PSIZE -t BSIZE -w BSIZE -Z -W
>      ...
>      (Run 'diff -u /home/adam/xfstests/tests/generic/091.out /home/adam/xfstests/results//generic/091.out.bad'  to see the entire diff)
>  Ran: generic/091
>  Failures: generic/091
>  Failed 1 of 1 tests
> 

I am trying to reproduce this error in fs-next with ext4/xfs but I am unable
to.

Do we need some specific disk setup or xfstests config to trigger this?

> [CAUSE]
> The failed command of fsx is COPY_RANGE:
> 
>  copy range: 0x6800 to 0xa200 at 0x3f200

-- 
Pankaj