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block: shortcut __submit_bio_noacct for blk-mq drivers 

For blk-mq drivers bios can only be inserted for the same queue.  So
bypass the complicated sorting logic in __submit_bio_noacct with
a blk-mq simpler submission helper.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-07-01 10:59:46 +02:00 committed by Jens Axboe
parent 566acf2daa
commit ff93ea0ce7
1 changed files with 30 additions and 0 deletions
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30
block/blk-core.c
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@ -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);