md: raid1: retrieve page from pre-allocated resync page array

Now one page array is allocated for each resync bio, and we can
retrieve page from this table directly.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
Ming Lei 2017-03-17 00:12:27 +08:00 • committed by Shaohua Li
commit 44cf0f4dc7