loop: Use bdev limit helpers for configuring discard

[ Upstream commit 8d3fd05 ]

Instead of directly looking at the request_queue limits, use the bdev
limits helpers, which is preferable.

Signed-off-by: John Garry <john.g.garry@oracle.com>
Link: https://lore.kernel.org/r/20241030111900.3981223-1-john.g.garry@oracle.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Stable-dep-of: f5c84ef ("loop: Add sanity check for read/write_iter")
Signed-off-by: Sasha Levin <sashal@kernel.org>
(cherry picked from commit 02a77b3020a2b8777ead56468e8f1421e640ebd6)
Signed-off-by: Jack Vogel <jack.vogel@oracle.com>

Author: johnpgarry

drivers/block/loop.c

@@ -710,11 +710,11 @@ static void loop_config_discard(struct loop_device *lo,
 	 * file-backed loop devices: discarded regions read back as zero.
 	 */
 	if (S_ISBLK(inode->i_mode)) {
-		struct request_queue *backingq = bdev_get_queue(I_BDEV(inode));
+		struct block_device *bdev = I_BDEV(inode);
 
-		max_discard_sectors = backingq->limits.max_write_zeroes_sectors;
-		granularity = bdev_discard_granularity(I_BDEV(inode)) ?:
-			queue_physical_block_size(backingq);
+		max_discard_sectors = bdev_write_zeroes_sectors(bdev);
+		granularity = bdev_discard_granularity(bdev) ?:
+			bdev_physical_block_size(bdev);
 
 	/*
 	 * We use punch hole to reclaim the free space used by the