ext4: Add inline data support.

Hi Ted, Andreas and list,
        This is the v3 attempt to add inline data support to ext4 inode.
For more information about the background, please refer to the thread
http://marc.info/?l=linux-ext4&m=131715205428067&w=2

Changelog from v2 to v3:
1. Add support for evict data from inode if we can store xattr in it.
2. Add support for fiemap
3. Some nasty bug fixes

The v2 can be found here:
http://marc.info/?l=linux-ext4&m=132189338604177&w=2

The v1 can be found here:
http://marc.info/?l=linux-ext4&m=131961438221255&w=2

any suggestions are welcomed.

git diff --stat master..
 fs/ext4/Makefile  |    2 +-
 fs/ext4/dir.c     |   39 +-
 fs/ext4/ext4.h    |   77 +++-
 fs/ext4/extents.c |   18 +-
 fs/ext4/ialloc.c  |    4 +
 fs/ext4/inline.c  | 1642
+++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/ext4/inode.c   |  236 ++++++--
 fs/ext4/namei.c   |  364 +++++++++----
 fs/ext4/xattr.c   |   64 +--
 fs/ext4/xattr.h   |  263 +++++++++
 10 files changed, 2481 insertions(+), 228 deletions(-)

Thanks
Tao
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