Reserve feature flags and fields needed for the Next3 snapshot feature

The documentation is not (as of this writing) fully complete, but
there is some documentation here:

http://sourceforge.net/apps/mediawiki/next3/index.php?title=Code_documentation
http://sourceforge.net/apps/mediawiki/next3/index.php?title=On-disk_format
http://sourceforge.net/projects/next3/files/Next3_Snapshots.pdf/download

... which will hopefully be updated soon to be fully up to date with
these assignments and more details about how things work.

For now, the assignments should avoid collisions with other new work
that people might want to do on ext3/4.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
1 file changed