ext4: Add inline data support

From: Tao Ma <boyu.mt@taobao.com>

Hi list,

this is another try for the inline data support for ext4. There is
no major change from V6. I just rebased it to 3.7-rc1 and run
xfstests again it.

git diff --stat
 fs/ext4/Makefile  |    2 +-
 fs/ext4/dir.c     |   41 +-
 fs/ext4/ext4.h    |   89 +++-
 fs/ext4/extents.c |   22 +-
 fs/ext4/ialloc.c  |    4 +
 fs/ext4/inline.c  | 1878 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/ext4/inode.c   |  237 ++++++--
 fs/ext4/namei.c   |  492 ++++++++++-----
 fs/ext4/xattr.c   |   87 ++-
 fs/ext4/xattr.h   |  280 ++++++++
 10 files changed, 2855 insertions(+), 277 deletions(-)

Thanks
Tao
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