Hi Ted, Andreas and list,
        This is the v4 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

Changlog from v3 to v4:
1. Add support for truncate which is really a bug.
2. Some bug fixes.
3. rebased to the latest kernel.

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 v3 can be found here:
http://marc.info/?l=linux-ext4&m=132421821001634&w=2

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.

Thanks
Tao