Ocfs2/move_extents: Adding new ioctl code 'OCFS2_IOC_MOVE_EXT' to ocfs2.

#define OCFS2_IOC_INFO		_IOR('o', 5, struct ocfs2_info)

struct ocfs2_move_extents {

/* All values are in bytes */

	/* in */

	__u64 me_start;		/* Virtual start in the file to move */

	__u64 me_len;		/* Length of the extents to be moved */

	__u64 me_goal;		/* Physical offset of the goal,

				   it's in block unit */

	__u64 me_threshold;	/* Maximum distance from goal or threshold

				   for auto defragmentation */

	__u64 me_flags;		/* Flags for the operation:

				 * - auto defragmentation.

				 * - refcount,xattr cases.

				 */

	/* out */

	__u64 me_moved_len;	/* Moved/defraged length */

	__u64 me_new_offset;	/* Resulting physical location */

	__u32 me_reserved[2];	/* Reserved for futhure */

};

#define OCFS2_MOVE_EXT_FL_AUTO_DEFRAG	(0x00000001)	/* Kernel manages to

							   claim new clusters

							   as the goal place

							   for extents moving */

#define OCFS2_MOVE_EXT_FL_PART_DEFRAG	(0x00000002)	/* Allow partial extent

							   moving, is to make

							   movement less likely

							   to fail, may make fs

							   even more fragmented */

#define OCFS2_MOVE_EXT_FL_COMPLETE	(0x00000004)	/* Move or defragmenation

							   completely gets done.

							 */

#define OCFS2_IOC_MOVE_EXT	_IOW('o', 6, struct ocfs2_move_extents)

#endif /* OCFS2_IOCTL_H */