block: shortcut __submit_bio_noacct for blk-mq drivers (ff93ea0c) · Commits · 戴 / test

block/blk-core.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -1152,6 +1152,34 @@ static blk_qc_t __submit_bio_noacct(struct bio *bio)
		return ret;
		}

		static blk_qc_t __submit_bio_noacct_mq(struct bio *bio)
		{
		struct gendisk *disk = bio->bi_disk;
		struct bio_list bio_list;
		blk_qc_t ret = BLK_QC_T_NONE;

		bio_list_init(&bio_list);
		current->bio_list = &bio_list;

		do {
		WARN_ON_ONCE(bio->bi_disk != disk);

		if (unlikely(bio_queue_enter(bio) != 0))
		continue;

		if (!blk_crypto_bio_prep(&bio)) {
		blk_queue_exit(disk->queue);
		ret = BLK_QC_T_NONE;
		continue;
		}

		ret = blk_mq_submit_bio(bio);
		} while ((bio = bio_list_pop(&bio_list)));

		current->bio_list = NULL;
		return ret;
		}

		/**
		* submit_bio_noacct - re-submit a bio to the block device layer for I/O
		* @bio: The bio describing the location in memory and on the device.
		@@ -1177,6 +1205,8 @@ blk_qc_t submit_bio_noacct(struct bio *bio)
		return BLK_QC_T_NONE;
		}

		if (!bio->bi_disk->fops->submit_bio)
		return __submit_bio_noacct_mq(bio);
		return __submit_bio_noacct(bio);
		}
		EXPORT_SYMBOL(submit_bio_noacct);