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authorTejun Heo <tj@kernel.org>2011-01-25 12:43:49 +0100
committerJens Axboe <jaxboe@fusionio.com>2011-01-25 12:43:49 +0100
commit414b4ff5eecff0097d09c4a7da12e435fd503692 (patch)
treecc7cd46c1455712af672b3ff872800b3da895837 /block
parent3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5 (diff)
downloadlinux-414b4ff5eecff0097d09c4a7da12e435fd503692.tar.bz2
block: add REQ_FLUSH_SEQ
rq == &q->flush_rq was used to determine whether a rq is part of a flush sequence, which worked because all requests in a flush sequence were sequenced using the single dedicated request. This is about to change, so introduce REQ_FLUSH_SEQ flag to distinguish flush sequence requests. This patch doesn't cause any behavior change. Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c4
-rw-r--r--block/blk-flush.c1
-rw-r--r--block/blk.h2
3 files changed, 4 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 4ce953f1b390..fc7d8ad76f44 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -136,7 +136,7 @@ static void req_bio_endio(struct request *rq, struct bio *bio,
{
struct request_queue *q = rq->q;
- if (&q->flush_rq != rq) {
+ if (!(rq->cmd_flags & REQ_FLUSH_SEQ)) {
if (error)
clear_bit(BIO_UPTODATE, &bio->bi_flags);
else if (!test_bit(BIO_UPTODATE, &bio->bi_flags))
@@ -1789,7 +1789,7 @@ static void blk_account_io_done(struct request *req)
* normal IO on queueing nor completion. Accounting the
* containing request is enough.
*/
- if (blk_do_io_stat(req) && req != &req->q->flush_rq) {
+ if (blk_do_io_stat(req) && !(req->cmd_flags & REQ_FLUSH_SEQ)) {
unsigned long duration = jiffies - req->start_time;
const int rw = rq_data_dir(req);
struct hd_struct *part;
diff --git a/block/blk-flush.c b/block/blk-flush.c
index 54b123d6563e..8592869bcbe7 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -130,6 +130,7 @@ static struct request *queue_next_fseq(struct request_queue *q)
BUG();
}
+ rq->cmd_flags |= REQ_FLUSH_SEQ;
elv_insert(q, rq, ELEVATOR_INSERT_FRONT);
return rq;
}
diff --git a/block/blk.h b/block/blk.h
index 2db8f32838e7..9d2ee8f4d9af 100644
--- a/block/blk.h
+++ b/block/blk.h
@@ -61,7 +61,7 @@ static inline struct request *__elv_next_request(struct request_queue *q)
while (!list_empty(&q->queue_head)) {
rq = list_entry_rq(q->queue_head.next);
if (!(rq->cmd_flags & (REQ_FLUSH | REQ_FUA)) ||
- rq == &q->flush_rq)
+ (rq->cmd_flags & REQ_FLUSH_SEQ))
return rq;
rq = blk_do_flush(q, rq);
if (rq)