Module Name: src
Committed By: riastradh
Date: Mon Mar 30 13:17:14 UTC 2015
Modified Files:
src/share/man/man9: bufferio.9
Log Message:
Note reusing bufs requires clearing BO_DONE.
To generate a diff of this commit:
cvs rdiff -u -r1.6 -r1.7 src/share/man/man9/bufferio.9
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/share/man/man9/bufferio.9
diff -u src/share/man/man9/bufferio.9:1.6 src/share/man/man9/bufferio.9:1.7
--- src/share/man/man9/bufferio.9:1.6 Mon Mar 30 13:10:04 2015
+++ src/share/man/man9/bufferio.9 Mon Mar 30 13:17:14 2015
@@ -1,4 +1,4 @@
-.\" $NetBSD: bufferio.9,v 1.6 2015/03/30 13:10:04 riastradh Exp $
+.\" $NetBSD: bufferio.9,v 1.7 2015/03/30 13:17:14 riastradh Exp $
.\"
.\" Copyright (c) 2015 The NetBSD Foundation, Inc.
.\" All rights reserved.
@@ -165,6 +165,14 @@ is not specified, the user may wait for
with
.Fn biowait bp .
.El
+.Pp
+Once an I/O transfer has completed, its
+.Li struct buf
+may be reused, but the user must first clear the
+.Dv BO_DONE
+flag of
+.Fa bp Ns Li "->b_oflags"
+before reusing it.
.Sh NESTED I/O TRANSFERS
Sometimes an I/O transfer from a single buffer in memory cannot go to a
single location on a block device: it must be split up into smaller
