block: cache request queue in bdev
There are tons of places where we need to get a request_queue only
having bdev, which turns into bdev->bd_disk->queue. There are probably a
hundred of such places considering inline helpers, and enough of them
are in hot paths.
Cache queue pointer in struct block_device and make use of it in
bdev_get_queue().
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a3bfaecdd28956f03629d0ca5c63ebc096e1c809.1634219547.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/block/bdev.c b/block/bdev.c
index 93b1188..fed8d0c 100644
--- a/block/bdev.c
+++ b/block/bdev.c
@@ -493,6 +493,7 @@ struct block_device *bdev_alloc(struct gendisk *disk, u8 partno)
spin_lock_init(&bdev->bd_size_lock);
bdev->bd_partno = partno;
bdev->bd_inode = inode;
+ bdev->bd_queue = disk->queue;
bdev->bd_stats = alloc_percpu(struct disk_stats);
if (!bdev->bd_stats) {
iput(inode);