blk_alloc_discard_bio
while ((bio = blk_alloc_discard_bio(bdev, §or, &nr_sects,
bio = blk_alloc_discard_bio(bdev, §or, &nr_sects,
bio = blk_alloc_discard_bio(bdev, §or, &nr_sects, gfp);
struct bio *blk_alloc_discard_bio(struct block_device *bdev,