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authorChengming Zhou <zhouchengming@bytedance.com>2023-07-17 12:00:58 +0800
committerJens Axboe <axboe@kernel.dk>2023-07-17 08:18:21 -0600
commit81ada09cc25e4bf2de7d2951925fb409338a545d (patch)
treeb486628026924a3c46956cafdce6d9604a135a29 /block
parentb175c86739d38e41044d3136065f092a6d95aee6 (diff)
blk-flush: reuse rq queuelist in flush state machine
Since we don't need to maintain inflight flush_data requests list anymore, we can reuse rq->queuelist for flush pending list. Note in mq_flush_data_end_io(), we need to re-initialize rq->queuelist before reusing it in the state machine when end, since the rq->rq_next also reuse it, may have corrupted rq->queuelist by the driver. This patch decrease the size of struct request by 16 bytes. Signed-off-by: Chengming Zhou <zhouchengming@bytedance.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ming Lei <ming.lei@redhat.com> Link: https://lore.kernel.org/r/20230717040058.3993930-5-chengming.zhou@linux.dev Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-flush.c17
1 files changed, 10 insertions, 7 deletions
diff --git a/block/blk-flush.c b/block/blk-flush.c
index fedb39031647..e73dc22d05c1 100644
--- a/block/blk-flush.c
+++ b/block/blk-flush.c
@@ -183,14 +183,13 @@ static void blk_flush_complete_seq(struct request *rq,
/* queue for flush */
if (list_empty(pending))
fq->flush_pending_since = jiffies;
- list_move_tail(&rq->flush.list, pending);
+ list_move_tail(&rq->queuelist, pending);
break;
case REQ_FSEQ_DATA:
- list_del_init(&rq->flush.list);
fq->flush_data_in_flight++;
spin_lock(&q->requeue_lock);
- list_add(&rq->queuelist, &q->requeue_list);
+ list_move(&rq->queuelist, &q->requeue_list);
spin_unlock(&q->requeue_lock);
blk_mq_kick_requeue_list(q);
break;
@@ -202,7 +201,7 @@ static void blk_flush_complete_seq(struct request *rq,
* flush data request completion path. Restore @rq for
* normal completion and end it.
*/
- list_del_init(&rq->flush.list);
+ list_del_init(&rq->queuelist);
blk_flush_restore_request(rq);
blk_mq_end_request(rq, error);
break;
@@ -258,7 +257,7 @@ static enum rq_end_io_ret flush_end_io(struct request *flush_rq,
fq->flush_running_idx ^= 1;
/* and push the waiting requests to the next stage */
- list_for_each_entry_safe(rq, n, running, flush.list) {
+ list_for_each_entry_safe(rq, n, running, queuelist) {
unsigned int seq = blk_flush_cur_seq(rq);
BUG_ON(seq != REQ_FSEQ_PREFLUSH && seq != REQ_FSEQ_POSTFLUSH);
@@ -292,7 +291,7 @@ static void blk_kick_flush(struct request_queue *q, struct blk_flush_queue *fq,
{
struct list_head *pending = &fq->flush_queue[fq->flush_pending_idx];
struct request *first_rq =
- list_first_entry(pending, struct request, flush.list);
+ list_first_entry(pending, struct request, queuelist);
struct request *flush_rq = fq->flush_rq;
/* C1 described at the top of this file */
@@ -376,6 +375,11 @@ static enum rq_end_io_ret mq_flush_data_end_io(struct request *rq,
*/
spin_lock_irqsave(&fq->mq_flush_lock, flags);
fq->flush_data_in_flight--;
+ /*
+ * May have been corrupted by rq->rq_next reuse, we need to
+ * re-initialize rq->queuelist before reusing it here.
+ */
+ INIT_LIST_HEAD(&rq->queuelist);
blk_flush_complete_seq(rq, fq, REQ_FSEQ_DATA, error);
spin_unlock_irqrestore(&fq->mq_flush_lock, flags);
@@ -386,7 +390,6 @@ static enum rq_end_io_ret mq_flush_data_end_io(struct request *rq,
static void blk_rq_init_flush(struct request *rq)
{
rq->flush.seq = 0;
- INIT_LIST_HEAD(&rq->flush.list);
rq->rq_flags |= RQF_FLUSH_SEQ;
rq->flush.saved_end_io = rq->end_io; /* Usually NULL */
rq->end_io = mq_flush_data_end_io;