Digested from:

• https://www.usenix.org/legacy/events/usenix05/tech/freenix/full_papers/hensbergen/hensbergen.pdf
• https://www.kernel.org/doc/Documentation/filesystems/9p.txt
• http://ericvh.github.io/9p-rfc/rfc9p2000.html
• http://ericvh.github.io/9p-rfc/rfc9p2000.u.html
• https://9fans.github.io/plan9port/man/man4/9pfuse.html
• https://github.com/pfpacket/rust-9p/tree/master/example/unpfs

9p2000 Opcodes

All messages take a tag parameter used to multiplex connections

Session

• version
  • parameter negotiations
• auth
  • T
    • afid: auth handle??
    • uname
      • username
    • aname: mount name (root if blank)
• attach
  • establish connection to server
  • T
    • fid is file handle, chosen by client?
    • afid is an ‘auth handle’
      • -1 for no auth
    • uname
    • aname
  • R:
• flush
  • abort request
• error

File

• walk
  • lookup pathname
• open
• create
• read
• write
• clunk
  • release a file?

Metadata

• stat
  • read metadata attrs
• wstat
  • write metadata attrs
• Requests are T-messages
• responses are R-messages