loop: get rid of lo_blocksize

This is only used for setting the soft block size on the struct
block_device once and then never used again.

Reviewed-by: Ming Lei <ming.lei@redhat.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 407cb17..efad2d4 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -573,8 +573,6 @@
 	mapping = file->f_mapping;
 	mapping_set_gfp_mask(old_file->f_mapping, lo->old_gfp_mask);
 	lo->lo_backing_file = file;
-	lo->lo_blocksize = S_ISBLK(mapping->host->i_mode) ?
-		mapping->host->i_bdev->bd_block_size : PAGE_SIZE;
 	lo->old_gfp_mask = mapping_gfp_mask(mapping);
 	mapping_set_gfp_mask(mapping, lo->old_gfp_mask & ~(__GFP_IO|__GFP_FS));
 	loop_update_dio(lo);
@@ -867,7 +865,6 @@
 	struct file	*file, *f;
 	struct inode	*inode;
 	struct address_space *mapping;
-	unsigned lo_blocksize;
 	int		lo_flags = 0;
 	int		error;
 	loff_t		size;
@@ -911,9 +908,6 @@
 	    !file->f_op->write_iter)
 		lo_flags |= LO_FLAGS_READ_ONLY;
 
-	lo_blocksize = S_ISBLK(inode->i_mode) ?
-		inode->i_bdev->bd_block_size : PAGE_SIZE;
-
 	error = -EFBIG;
 	size = get_loop_size(lo, file);
 	if ((loff_t)(sector_t)size != size)
@@ -927,7 +921,6 @@
 	set_device_ro(bdev, (lo_flags & LO_FLAGS_READ_ONLY) != 0);
 
 	lo->use_dio = false;
-	lo->lo_blocksize = lo_blocksize;
 	lo->lo_device = bdev;
 	lo->lo_flags = lo_flags;
 	lo->lo_backing_file = file;
@@ -947,7 +940,8 @@
 	/* let user-space know about the new size */
 	kobject_uevent(&disk_to_dev(bdev->bd_disk)->kobj, KOBJ_CHANGE);
 
-	set_blocksize(bdev, lo_blocksize);
+	set_blocksize(bdev, S_ISBLK(inode->i_mode) ?
+		      block_size(inode->i_bdev) : PAGE_SIZE);
 
 	lo->lo_state = Lo_bound;
 	if (part_shift)