From: Yu Kuai <yukuai3@xxxxxxxxxx>
So that if caller didn't use plug, for example, __blkdev_direct_IO_simple()
and __blkdev_direct_IO_async(), block layer can still benefit from caching
nsec time in the plug. And if caller already use plug, then there should be
no affect.
Signed-off-by: Yu Kuai <yukuai3@xxxxxxxxxx>
---
block/blk-core.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/block/blk-core.c b/block/blk-core.c
index e317d7bc0696..c833bc875a61 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -647,11 +647,13 @@ static void __submit_bio(struct bio *bio)
static void __submit_bio_noacct(struct bio *bio)
{
struct bio_list bio_list_on_stack[2];
+ struct blk_plug plug;
BUG_ON(bio->bi_next);
bio_list_init(&bio_list_on_stack[0]);
current->bio_list = bio_list_on_stack;
+ blk_start_plug(&plug);
do {
struct request_queue *q = bdev_get_queue(bio->bi_bdev);
@@ -685,19 +687,23 @@ static void __submit_bio_noacct(struct bio *bio)
bio_list_merge(&bio_list_on_stack[0], &bio_list_on_stack[1]);
} while ((bio = bio_list_pop(&bio_list_on_stack[0])));
+ blk_finish_plug(&plug);
current->bio_list = NULL;
}
static void __submit_bio_noacct_mq(struct bio *bio)
{
struct bio_list bio_list[2] = { };
+ struct blk_plug plug;
current->bio_list = bio_list;
+ blk_start_plug(&plug);
do {
__submit_bio(bio);
} while ((bio = bio_list_pop(&bio_list[0])));
+ blk_finish_plug(&plug);
current->bio_list = NULL;
}
--
2.39.2
