block: Check for gaps on front and back merges
We are checking for gaps to previous bio_vec, which can only detect back merges gaps. Moreover, at the point where we check for a gap, we don't know if we will attempt a back or a front merge. Thus, check for gap to prev in a back merge attempt and check for a gap to next in a front merge attempt. Signed-off-by: NJens Axboe <axboe@fb.com> [sagig: Minor rename change] Signed-off-by: NSagi Grimberg <sagig@mellanox.com>
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