[dm-devel] [PATCH] md/raid0: Fail BIOs if their underlying block device is gone

[Song Liu]

On Tue, Jul 30, 2019 at 5:31 AM Guilherme G. Piccoli
<gpiccoli at canonical.com> wrote:
>
> On 29/07/2019 21:08, NeilBrown wrote:
> >[...]
> >> +    if (unlikely(test_bit(MD_BROKEN, &mddev->flags))) {
> >> +            bio_io_error(bio);
> >> +            return BLK_QC_T_NONE;
> >> +    }
> >
> > I think this should only fail WRITE requests, not READ requests.
> >
> > Otherwise the patch is probably reasonable.
> >
> > NeilBrown
>
> Thanks for the feedback Neil! I thought about it; it seemed to me better
> to deny/fail the reads instead of returning "wrong" reads, since a file
> read in a raid0 will be incomplete if one member is missing.
> But it's fine for me to change that in the next iteration of this patch.

For reads at block/page level, we will either get EIO or valid data, right?

If that's not the case, we should fail all writes.

Thanks,
Song