fs: export setup_bdev_super

We'll want to use setup_bdev_super instead of duplicating it in nilfs2.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Christian Brauner <brauner@kernel.org>
Message-Id: <20230802154131.2221419-2-hch@lst.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>

fs/super.c

@@ -1243,7 +1243,7 @@ static int test_bdev_super_fc(struct super_block *s, struct fs_context *fc)
 		s->s_dev == *(dev_t *)fc->sget_key;
 }
 
-static int setup_bdev_super(struct super_block *sb, int sb_flags,
+int setup_bdev_super(struct super_block *sb, int sb_flags,
 		struct fs_context *fc)
 {
 	blk_mode_t mode = sb_open_mode(sb_flags);
@@ -1295,6 +1295,7 @@ static int setup_bdev_super(struct super_block *sb, int sb_flags,
 	sb_set_blocksize(sb, block_size(bdev));
 	return 0;
 }
+EXPORT_SYMBOL_GPL(setup_bdev_super);
 
 /**
  * get_tree_bdev - Get a superblock based on a single block device

include/linux/fs_context.h

@@ -158,6 +158,8 @@ extern int get_tree_keyed(struct fs_context *fc,
 					   struct fs_context *fc),
 			 void *key);
 
+int setup_bdev_super(struct super_block *sb, int sb_flags,
+		struct fs_context *fc);
 extern int get_tree_bdev(struct fs_context *fc,
 			       int (*fill_super)(struct super_block *sb,
 						 struct fs_context *fc));