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

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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>
This commit is contained in:
Tejun Heo
2006-02-08 01:01:31 -08:00
committed by Linus Torvalds
parent e5ea0a9fca
commit 30e9656cc3
3 changed files with 41 additions and 34 deletions
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block/ll_rw_blk.c
+2 -2
View File
@@ -454,7 +454,7 @@ static void queue_flush(request_queue_t *q, unsigned which)
rq->end_io = end_io;
q->prepare_flush_fn(q, rq);
__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0);
elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
}
static inline struct request *start_ordered(request_queue_t *q,
@@ -490,7 +490,7 @@ static inline struct request *start_ordered(request_queue_t *q,
else
q->ordseq |= QUEUE_ORDSEQ_POSTFLUSH;
__elv_add_request(q, rq, ELEVATOR_INSERT_FRONT, 0);
elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
if (q->ordered & QUEUE_ORDERED_PREFLUSH) {
queue_flush(q, QUEUE_ORDERED_PREFLUSH);