xfs: Block writes to log device

Ask block layer to not allow other writers to open block devices used
for xfs log and realtime devices.
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20231101174325.10596-6-jack@suse.czReviewed-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/xfs/xfs_super.c

@@ -366,8 +366,9 @@ xfs_blkdev_get(
 {
 	int			error = 0;
 
-	*handlep = bdev_open_by_path(name, BLK_OPEN_READ | BLK_OPEN_WRITE,
-				     mp->m_super, &fs_holder_ops);
+	*handlep = bdev_open_by_path(name,
+		BLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,
+		mp->m_super, &fs_holder_ops);
 	if (IS_ERR(*handlep)) {
 		error = PTR_ERR(*handlep);
 		*handlep = NULL;