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a brief note about struct buf.

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yamt 2003-09-15 13:14:34 +00:00
parent dd44c6fdfc
commit f11dd83e4c
1 changed files with 9 additions and 1 deletions
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10
share/man/man9/buffercache.9
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@ -1,4 +1,4 @@
.\" $NetBSD: buffercache.9,v 1.7 2003/09/10 13:54:08 wiz Exp $ .\" $NetBSD: buffercache.9,v 1.8 2003/09/15 13:14:34 yamt Exp $
.\" .\"
.\" Copyright (c)2003 YAMAMOTO Takashi, .\" Copyright (c)2003 YAMAMOTO Takashi,
.\" All rights reserved. .\" All rights reserved.
@ -161,6 +161,14 @@ The
.Nm .Nm
interface is used by each filesystems to improve I/O performance using interface is used by each filesystems to improve I/O performance using
in-core caches of filesystem blocks. in-core caches of filesystem blocks.
.Pp
The kernel memory used to cache a block is called a buffer and described by
.Em buf
structure.
In addition to describing a cached block,
.Em buf
structure is also used to describe an I/O request as a part of
the disk driver interface.
.\" XXX struct buf, B_ flags, MP locks, etc .\" XXX struct buf, B_ flags, MP locks, etc
.\" ------------------------------------------------------------ .\" ------------------------------------------------------------
.Sh FUNCTIONS .Sh FUNCTIONS