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- .HTML "The 64-bit Standalone Plan 9 File Server
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- .EN
- .FP lucidasans
- .TL
- The 64-bit Standalone Plan 9 File Server
- .AU
- Ken Thompson*
- .CW ken@plan9.bell-labs.com
- .FS
- \l'4i'
- .br
- * now
- .\" .CW ken@entrisphere.com
- .CW ken@google.com
- .FE
- .AU
- Geoff Collyer
- .CW geoff@plan9.bell-labs.com
- .AI
- .MH
- .AB
- This paper is a revision of Thompson's
- .I "The Plan 9 File Server" ,
- and describes the structure
- and the operation of the new 64-bit Plan 9 file servers.
- Some specifics apply to the 32-bit
- Plan 9 file server
- Emelie,
- which code is also the basis for
- the user-level file server
- .CW kfs .
- .PP
- In 2004,
- Collyer created a 64-bit version of
- Thompson's 32-bit file server, updating all file
- offsets, sizes and block numbers to 64 bits.
- In addition, triple- and quadruple-indirect
- blocks were implemented.
- File name components were extended from 27 to 55 bytes.
- This code is also the basis for the user-level file server
- .I cwfs (4).
- .AE
- .SH
- Introduction
- .PP
- The Plan 9 file server
- Emelie
- is the oldest piece of system software
- still in use on Plan 9.
- It evolved from a user-level program that served
- serial lines on a Sequent multi-processor.
- The current implementation is neither clean nor
- portable,
- but it has slowly come to terms with
- its particular set of cranky computers
- and devices.
- .PP
- The file server
- .I fs64
- runs a revision of Emelie's code
- with 64-bit file sizes, offsets and block numbers
- and indirect blocks from single to quadruple.
- Actually these are 63-bit values, since the type used is
- .I vlong
- (signed
- .I "long long"
- integer),
- but 63 bits should suffice for a little while.
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