Re: [PATCH blktests] block/045: respect dma_alignment

[Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>]

On Aug 06, 2026 / 18:42, Shin'ichiro Kawasaki wrote:
> Since the kernel commit 14b007e17881 ("block: validate user space
> vectors during extraction"), the test case block/045 fails with the
> error message below:
> 
>  block/045 (test direct I/O full-trim bvec alignment)         [failed]
>      runtime  0.550s  ...  0.630s
>      --- tests/block/045.out     2026-08-03 19:26:40.407053612 +0900
>      +++ /home/shin/Blktests/blktests/results/nodev/block/045.out.bad    2026-08-05 20:48:33.366932845 +0900
>      @@ -1,2 +1,4 @@
>       Running block/045
>      +bio-full-trim: pread returned -1 (errno 22)
>      +bio-full-trim helper failed
>       Test complete
> 
> The errno 22 means EINVAL. The commit introduced the dma_alignment check
> and returns EINVAL when the check is not fulfilled. The test case calls
> pread() with one byte offset. This offset is not aligned to the
> dma_alignment, then EINVAL is returned.
> 
> To avoid the failure, respect the dma_alignment check. Get the
> dma_alignment value and pass it to bio-full-trim command. Use the
> alignment to decide the offset value.

FYI, I applied the patch.