Out of kernel tree versions of Linux 9P modules for RHEL 6 based distros. These versions were initially based on 2.6.38.5, but many patches were subsequently backported from newer kernels. Testing has been primarily with the diod 9P2000.L server.
A spec file is included which allows these modules to be built as
an RPM named kmod-v9fs.
block/9nbd contains a network block device driver that leverages
in-kernel 9P transport support, and thus can use all of the transport
features offered by 9P, and can be served by battle-hardened 9p servers
such as diod.
A more detailed write-up on 9nbd is available on the diod 9NBD wiki page.