tree dce51421028d162af78514b631dc75a6be92cf11
parent 5fdb7e1b976dc9d18aff8c711e51d17c4c324a0e
author Jens Axboe <axboe@fb.com> 1441297700 +0300
committer Jens Axboe <axboe@fb.com> 1441297989 -0600

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: Jens Axboe <axboe@fb.com>
[sagig: Minor rename change]
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>