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Rev	Author	Line No.	Line
2	-	1	`.HTML "The 64-bit Standalone Plan 9 File Server`
		2	`.de Ex`
		3	`.TA 0.5i 1i 1.5i 2i 2.5i 3i 3.5i 4i 4.5i 5i 5.5i`
		4	`.P1`
		5	`.TA 0.5i 1i 1.5i 2i 2.5i 3i 3.5i 4i 4.5i 5i 5.5i`
		6	`..`
		7	`.de Ee`
		8	`.P2`
		9	`..`
		10
		11	`.EQ`
		12	`delim $$`
		13	`.EN`
		14	`.FP lucidasans`
		15
		16	`.TL`
		17	`The 64-bit Standalone Plan 9 File Server`
		18	`.AU`
		19	`Ken Thompson*`
		20	`.CW ken@plan9.bell-labs.com`
		21	`.FS`
		22	`\l'4i'`
		23	`.br`
		24	`* now`
		25	`.\" .CW ken@entrisphere.com`
		26	`.CW ken@google.com`
		27	`.FE`
		28	`.AU`
		29	`Geoff Collyer`
		30	`.CW geoff@plan9.bell-labs.com`
		31	`.AI`
		32	`.MH`
		33	`.AB`
		34	`This paper is a revision of Thompson's`
		35	`.I "The Plan 9 File Server" ,`
		36	`and describes the structure`
		37	`and the operation of the new 64-bit Plan 9 file servers.`
		38	`Some specifics apply to the 32-bit`
		39	`Plan 9 file server`
		40	`Emelie,`
		41	`which code is also the basis for`
		42	`the user-level file server`
		43	`.CW kfs .`
		44	`.PP`
		45	`In 2004,`
		46	`Collyer created a 64-bit version of`
		47	`Thompson's 32-bit file server, updating all file`
		48	`offsets, sizes and block numbers to 64 bits.`
		49	`In addition, triple- and quadruple-indirect`
		50	`blocks were implemented.`
		51	`File name components were extended from 27 to 55 bytes.`
		52	`This code is also the basis for the user-level file server`
		53	`.I cwfs (4).`
		54	`.AE`
		55	`.SH`
		56	`Introduction`
		57	`.PP`
		58	`The Plan 9 file server`
		59	`Emelie`
		60	`is the oldest piece of system software`
		61	`still in use on Plan 9.`
		62	`It evolved from a user-level program that served`
		63	`serial lines on a Sequent multi-processor.`
		64	`The current implementation is neither clean nor`
		65	`portable,`
		66	`but it has slowly come to terms with`
		67	`its particular set of cranky computers`
		68	`and devices.`
		69	`.PP`
		70	`The file server`
		71	`.I fs64`
		72	`runs a revision of Emelie's code`
		73	`with 64-bit file sizes, offsets and block numbers`
		74	`and indirect blocks from single to quadruple.`
		75	`Actually these are 63-bit values, since the type used is`
		76	`.I vlong`
		77	`(signed`
		78	`.I "long long"`
		79	`integer),`
		80	`but 63 bits should suffice for a little while.`

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