Re: [PATCH 1/1] md: skip discard on unsupported member devices

[wale zhang]

OK. Thanks!

On Fri, Aug 7, 2026 at 4:35 PM yu kuai <yukuai@xxxxxxx> wrote:
>
> 在 2026/7/31 15:47, Wale Zhang 写道:
>
> > blk_stack_limits() uses min_not_zero() when stacking discard limits.
> > Thus an array containing devices with different discard capabilities can
> > expose discard support as long as at least one member has a non-zero
> > discard limit.
> >
> > raid0 and raid10 use md_submit_discard_bio() to submit a discard bio to
> > each member covered by the request.  The helper currently also submits
> > bios to members whose max_discard_sectors is zero.  The block layer
> > completes these bios with BLK_STS_NOTSUPP, and bio chaining propagates
> > that status to the original discard request.
> >
> > Discard is optional, so skip members which do not support it.  Members that
> > do support discard continue to receive their portion of the request.
> >
> > Signed-off-by: Wale Zhang<wale.zhang.ftd@xxxxxxxxx>
> > ---
> >   drivers/md/md.c | 4 ++++
> >   1 file changed, 4 insertions(+)
> Applied to md-7.3
>
> --
> Thanks,
> Kuai