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

Patch also manages to add a manipulative struture for this ioctl.

Signed-off-by: Tristan Ye <tristan.ye@oracle.com>

diff --git a/fs/ocfs2/ocfs2_ioctl.h b/fs/ocfs2/ocfs2_ioctl.h
index 18b6770dc4686cf3baf95dee10ae5d571baa9a2e..5b27ff1fa577d95533c0b594349b23f8cc62bd62 100644 (file)
--- a/fs/ocfs2/ocfs2_ioctl.h
+++ b/fs/ocfs2/ocfs2_ioctl.h
@@ -205,4 +205,38 @@ enum ocfs2_info_type {
 
 #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 */