The book "Introduction to Operating Systems Abstractions using Plan 9 from Bell Labs" (also known informally as 9.intro) by Francisco Ballesteros has some well-

The book "Introduction to Operating Systems Abstractions using Plan 9 from Bell Labs" (also known informally as 9.intro) by Francisco Ballesteros has some well-written content that should be suitable even for beginners. Find it here: http://lsub.org/who/nemo/9.intro.pdf http://lsub.org/who/nemo/9.intro.pdf Ideas on how to present resources as file systems can be found in the original Plan 9 and Inferno papers. In addition, Charles Forsyth's "The Ubiquitous File Server in Plan 9" might also prove useful. http://doc.cat-v.org/plan_9/misc/ubiquitous_fileserver/ubiquitous_fileserver.pdf http://doc.cat-v.org/plan_9/misc/ubiquitous_fileserver/ubiqu... After that, there's always the source code of the 9P file systems shipped with Plan 9.