Neil Brown wrote:
sector, bdev, size are all remembered in r1_bio.
That leaves bi_idx and an array od len/offset pairs that we need
to preserve.
So I guess the first step is to change alloc_behind_pages to
return a new 'struct bio_vec' array rather than just a list of pages,
and we should keep that array attached to the raid1_bio.
I think bio_clone gives us that already. I may have missed something but
I think we have everything we need:
When a bio comes into raid1's make_request we bio_clone for each drive
and attach those to r1_bio->bios. We also have behind_pages, which
contains the pages. I think maybe instead of cloning r1_bio->master_bio,
we can just clone r1_bio->bios[i]. Does that make sense?
Let me try that.
--
Paul
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