> +static sector_t map_to_core(struct dm_target *ti, struct bio *bio)
> +{
> + struct unstripe_c *uc = ti->private;
> + sector_t sector = bio->bi_iter.bi_sector;
> +
> + /* Account for what stripe we're operating on */
> + sector += uc->unstripe_offset;
> +
> + /* Shift us up to the right "row" on the stripe */
> + sector += uc->unstripe_width * (sector >> uc->chunk_shift);
> + return sector;
> +}
This doesn't work anymore, previously we had a "group" local variable,
but removed it out. Now we're calculating the group based *after* we
switch up the stripe.
we need to swap the two sector += then it will work:
/* Shift us up to the right "row" on the stripe */
sector += uc->unstripe_width * (sector >> uc->chunk_shift);
/* Account for what stripe we're operating on */
sector += uc->unstripe_offset;
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