Re: [PATCH RFC 5/6] md/raid1: Handle bio_split() errors

[John Garry <john.g.garry@xxxxxxxxxx>]

On 23/09/2024 07:15, Yu Kuai wrote:

Hi Kuai,

> > iff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
> > index 6c9d24203f39..c561e2d185e2 100644
> > --- a/drivers/md/raid1.c
> > +++ b/drivers/md/raid1.c
> > @@ -1383,6 +1383,10 @@ static void raid1_read_request(struct mddev 
> > *mddev, struct bio *bio,
> >       if (max_sectors < bio_sectors(bio)) {
> >           struct bio *split = bio_split(bio, max_sectors,
> >                             gfp, &conf->bio_split);
> > +        if (IS_ERR(split)) {
> > +            raid_end_bio_io(r1_bio);
> > +            return;
> > +        }
>
> This way, BLK_STS_IOERR will always be returned, perhaps what you want
> is to return the error code from bio_split()?

I am not sure on the best way to pass the bio_split() error code to 
bio->bi_status.

I could just have this pattern:

bio->bi_status = errno_to_blk_status(err);
set_bit(R1BIO_Uptodate, &r1_bio->state);
raid_end_bio_io(r1_bio);

Is there a neater way to do this?

Thanks,
John