attached RFC patches adds facility in ext4 to have user data in every ext4 dirent.
lustre assigns cluserwide unique id to every inode in system, so we have added
user data field in ext4 dirent to map filename to id efficiently.
i would like to get feedback on this as it might have some conflict with 64 bit
inode work (which is in discussion phase). also please comment on INCOMPAT flag
added.
patch[1] removes dx_root struct so that "." and ".." can have extra data.
patch[2] add user data field to ext4 dirent.
Thanks,
Pravin.