ext4: use sb_bdev_nr_blocks

Use the sb_bdev_nr_blocks helper instead of open coding it.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Kees Cook <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Reviewed-by: Chaitanya Kulkarni <[email protected]>
Acked-by: Theodore Ts'o <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jens Axboe <[email protected]>

Author: Christoph Hellwig

fs/ext4/super.c

@@ -4474,7 +4474,7 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 		goto cantfind_ext4;
 
 	/* check blocks count against device size */
-	blocks_count = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits;
+	blocks_count = sb_bdev_nr_blocks(sb);
 	if (blocks_count && ext4_blocks_count(es) > blocks_count) {
 		ext4_msg(sb, KERN_WARNING, "bad geometry: block count %llu "
 		       "exceeds size of device (%llu blocks)",