tree 5fc623ccad5a1f5b09ebc4b7e8d7c6bec8e485ac
parent e5ea0a9fca5612808839dd4bcc41c46fc02451f9
author Tejun Heo <htejun@gmail.com> 1139389291 -0800
committer Linus Torvalds <torvalds@g5.osdl.org> 1139413978 -0800

[PATCH] block: implement elv_insert and use it (fix ordcolor flipping bug)

q->ordcolor must only be flipped on initial queueing of a hardbarrier
request.

Constructing ordered sequence and requeueing used to pass through
__elv_add_request() which flips q->ordcolor when it sees a barrier
request.

This patch separates out elv_insert() from __elv_add_request() and uses
elv_insert() when constructing ordered sequence and requeueing.
elv_insert() inserts the given request at the specified position and
does nothing else.

Signed-off-by: Tejun Heo <htejun@gmail.com>
Acked-by: Jens Axboe <axboe@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>