@@ -613,6 +613,21 @@ struct super_block *get_super(struct block_device *bdev)
}
EXPORT_SYMBOL(get_super);
+static int cdev_compare(struct super_block *sb, void *key)
+{
+ return (sb->s_cdev == (struct cdev *)key);
+}
+
+/**
+ * get_super_cdev - get the superblock of a cdev
+ * @cdev: char device to get the superblock for
+ */
+struct super_block *get_super_cdev(struct cdev *cdev)
+{
+ return __get_super(cdev_compare, cdev);
+}
+EXPORT_SYMBOL(get_super_cdev);
+
/**
* get_super_thawed - get thawed superblock of a device
* @bdev: device to get the superblock for
@@ -2796,6 +2796,7 @@ extern void get_filesystem(struct file_system_type *fs);
extern void put_filesystem(struct file_system_type *fs);
extern struct file_system_type *get_fs_type(const char *name);
extern struct super_block *get_super(struct block_device *);
+extern struct super_block *get_super_cdev(struct cdev *);
extern struct super_block *get_super_thawed(struct block_device *);
extern struct super_block *get_active_super(struct block_device *bdev);
extern void drop_super(struct super_block *sb);