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author | dfr <dfr@FreeBSD.org> | 1997-03-03 18:01:01 +0000 |
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committer | dfr <dfr@FreeBSD.org> | 1997-03-03 18:01:01 +0000 |
commit | 7e67e1e73230219ea55118f095cc1800faf2c534 (patch) | |
tree | e33dd16a7d9cf5ad26d4f75d4b2d3db1b3d2fdd9 /share/man/man9/vref.9 | |
parent | 6c38eceeb9c3076678e4763e02440823894d2323 (diff) | |
download | FreeBSD-src-7e67e1e73230219ea55118f095cc1800faf2c534.zip FreeBSD-src-7e67e1e73230219ea55118f095cc1800faf2c534.tar.gz |
This is the current draft of my filesystem manpages. Some files are
incomplete and some are just placeholders but I wanted to try to get
something at least into 2.2 on the grounds that what I have is a lot
better than nothing. I also wanted to commit something which documents
the interfaces in 2.2 before I start updating the documentation for 3.0.
This is a definite 2.2 candidate and is also relavent to 2.1 if people
still care about that branch.
Diffstat (limited to 'share/man/man9/vref.9')
-rw-r--r-- | share/man/man9/vref.9 | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/share/man/man9/vref.9 b/share/man/man9/vref.9 new file mode 100644 index 0000000..47282da --- /dev/null +++ b/share/man/man9/vref.9 @@ -0,0 +1,65 @@ +.\" -*- nroff -*- +.\" +.\" Copyright (c) 1996 Doug Rabson +.\" +.\" All rights reserved. +.\" +.\" This program is free software. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR +.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, +.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.\" $Id$ +.\" +.Dd July 24, 1996 +.Os +.Dt vref 9 +.Sh NAME +.Nm vref +.Nd increment the use count for a vnode +.Sh SYNOPSIS +.Fd #include <sys/vnode.h> +.Ft int +.Fn vref "struct vnode *vp" +.Sh DESCRIPTION +Increment the +.Dv v_usecount +field of a vnode. +.Bl -tag -width vp +.It Ar vp +the vnode to increment +.El +.Pp +Each vnode maintains a reference count of how many parts of the system +are using the vnode. This allows the system to detect when a vnode is +no longer being used and can be safely recycled for a different file. +.Pp +Any code in the system which is using a vnode (e.g. during the +operation of some algorithm or to store in a data structure) should +call +.Xr vref 9 . +.Sh SEE ALSO +.Xr vnode 9 , +.Xr vget 9 , +.Xr vput 9 , +.Xr vrele 9 +.Sh AUTHORS +This man page was written by Doug Rabson. + |