80 lines
1.7 KiB
Text
80 lines
1.7 KiB
Text
.HTML "The 64-bit Standalone Plan 9 File Server
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.de Ex
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.TA 0.5i 1i 1.5i 2i 2.5i 3i 3.5i 4i 4.5i 5i 5.5i
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.P1
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.TA 0.5i 1i 1.5i 2i 2.5i 3i 3.5i 4i 4.5i 5i 5.5i
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..
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.de Ee
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.P2
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..
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.EQ
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delim $$
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.EN
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.FP lucidasans
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.TL
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The 64-bit Standalone Plan 9 File Server
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.AU
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Ken Thompson*
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.CW ken@plan9.bell-labs.com
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.FS
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\l'4i'
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.br
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* now
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.\" .CW ken@entrisphere.com
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.CW ken@google.com
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.FE
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.AU
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Geoff Collyer
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.CW geoff@plan9.bell-labs.com
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.AI
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.MH
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.AB
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This paper is a revision of Thompson's
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.I "The Plan 9 File Server" ,
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and describes the structure
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and the operation of the new 64-bit Plan 9 file servers.
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Some specifics apply to the 32-bit
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Plan 9 file server
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Emelie,
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which code is also the basis for
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the user-level file server
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.CW kfs .
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.PP
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In 2004,
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Collyer created a 64-bit version of
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Thompson's 32-bit file server, updating all file
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offsets, sizes and block numbers to 64 bits.
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In addition, triple- and quadruple-indirect
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blocks were implemented.
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File name components were extended from 27 to 55 bytes.
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This code is also the basis for the user-level file server
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.I cwfs (4).
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.AE
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.SH
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Introduction
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.PP
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The Plan 9 file server
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Emelie
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is the oldest piece of system software
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still in use on Plan 9.
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It evolved from a user-level program that served
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serial lines on a Sequent multi-processor.
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The current implementation is neither clean nor
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portable,
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but it has slowly come to terms with
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its particular set of cranky computers
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and devices.
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.PP
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The file server
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.I fs64
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runs a revision of Emelie's code
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with 64-bit file sizes, offsets and block numbers
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and indirect blocks from single to quadruple.
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Actually these are 63-bit values, since the type used is
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.I vlong
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(signed
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.I "long long"
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integer),
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but 63 bits should suffice for a little while.
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