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Note reusing bufs requires clearing BO_DONE.

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riastradh 2015-03-30 13:17:14 +00:00
parent ba2aeff9b2
commit e90024bf9f
1 changed files with 9 additions and 1 deletions
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10
share/man/man9/bufferio.9
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@ -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 the I/O transfer to complete
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