[src/trunk]: src/share/man/man9 a brief note about struct buf.

[yamt <yamt%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/7ef5de6dd454
branches:  trunk
changeset: 551994:7ef5de6dd454
user:      yamt <yamt%NetBSD.org@localhost>
date:      Mon Sep 15 13:14:34 2003 +0000

description:
a brief note about struct buf.

diffstat:

 share/man/man9/buffercache.9 |  10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diffs (24 lines):

diff -r 04e3e3807993 -r 7ef5de6dd454 share/man/man9/buffercache.9
--- a/share/man/man9/buffercache.9      Mon Sep 15 13:10:27 2003 +0000
+++ b/share/man/man9/buffercache.9      Mon Sep 15 13:14:34 2003 +0000
@@ -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,
 .\" All rights reserved.
@@ -161,6 +161,14 @@
 .Nm
 interface is used by each filesystems to improve I/O performance using
 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
 .\" ------------------------------------------------------------
 .Sh FUNCTIONS