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block: add REQ_FLUSH_SEQ

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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>
This commit is contained in:
Tejun Heo 2011-01-25 12:43:49 +01:00 committed by Jens Axboe
parent 3c0eee3fe6
commit 414b4ff5ee
4 changed files with 6 additions and 3 deletions
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4
block/blk-core.c
View file

@ -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;

1
block/blk-flush.c
View file

@ -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;
}

2
block/blk.h
View file

@ -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)

2
include/linux/blk_types.h
View file

@ -148,6 +148,7 @@ enum rq_flag_bits {
__REQ_ALLOCED, /* request came from our alloc pool */
__REQ_COPY_USER, /* contains copies of user pages */
__REQ_FLUSH, /* request for cache flush */
__REQ_FLUSH_SEQ, /* request for flush sequence */
__REQ_IO_STAT, /* account I/O stat */
__REQ_MIXED_MERGE, /* merge of different types, fail separately */
__REQ_SECURE, /* secure discard (used with __REQ_DISCARD) */
@ -188,6 +189,7 @@ enum rq_flag_bits {
#define REQ_ALLOCED (1 << __REQ_ALLOCED)
#define REQ_COPY_USER (1 << __REQ_COPY_USER)
#define REQ_FLUSH (1 << __REQ_FLUSH)
#define REQ_FLUSH_SEQ (1 << __REQ_FLUSH_SEQ)
#define REQ_IO_STAT (1 << __REQ_IO_STAT)
#define REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
#define REQ_SECURE (1 << __REQ_SECURE)