ext4: online defrag -- Add EXT4_IOC_MOVE_EXT ioctl

The EXT4_IOC_MOVE_EXT exchanges the blocks between orig_fd and donor_fd,
and then write the file data of orig_fd to donor_fd.
ext4_mext_move_extent() is the main fucntion of ext4 online defrag,
and this patch includes all functions related to ext4 online defrag.

Signed-off-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: Takashi Sato <t-sato@yk.jp.nec.com>
Signed-off-by: Kazuya Mio <k-mio@sx.jp.nec.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

diff --cc fs/ext4/Makefile
Simple merge

diff --cc fs/ext4/ext4.h
Simple merge

diff --cc fs/ext4/ext4_extents.h
Simple merge

diff --cc fs/ext4/extents.c
Simple merge

diff --cc fs/ext4/ioctl.c
Simple merge

diff --cc fs/ext4/move_extent.c
Simple merge