At the AFS & Kerberos Conference 2011 in Hamburg D. Brashear and Jeffrey Altman proposed to seperate all AFS/OSD code into shared libraries and have in the main openafs code only hooks into these libraries. So the plan was to concentrate all the code in the already existing subdirectory src/rxosd.
On the AFS & Kerberos Conference 2014 it we decided to keep most of the contants of the src/rxosd in a new subdirectory src/afsosd which is a git submodule. The reason for this deciscion was that openafs did not want to have to support the AFS/OSD extensions in the future.
The contents of src/afsosd is hosted at github in the project "git://github.com/hwr/afsosd.git"
If you want to compile openafs with afs/osd go to src and do a "git clone git://github.com/hwr/afsosd.git afsosd"
Then do the openafs configure. This will then include src/afsosd in the build
The subdirectory src/rxosd now contains only the code needed to build the hooks in the main openafs code for the fileserver, volserver, salvager, fs and vos commands and the cache manager.