114 lines
2.9 KiB
Groff
114 lines
2.9 KiB
Groff
.\" -*- nroff -*-
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.\"
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.\" Copyright (c) 1996 Doug Rabson
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.\"
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.\" All rights reserved.
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.\"
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.\" This program is free software.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR
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.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT,
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.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd July 24, 1996
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.Os
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.Dt VOP_INACTIVE 9
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.Sh NAME
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.Nm VOP_INACTIVE ,
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.Nm VOP_RECLAIM
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.Nd reclaim file system resources for a vnode
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/vnode.h
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.Ft int
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.Fn VOP_INACTIVE "struct vnode *vp" "struct thread *td"
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.Ft int
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.Fn VOP_RECLAIM "struct vnode *vp" "struct thread *td"
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.Sh DESCRIPTION
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The arguments are:
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.Bl -tag -width 2n
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.It Fa vp
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The vnode being reclaimed.
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.El
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.Pp
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.Fn VOP_INACTIVE
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is called when the kernel is no longer using the vnode.
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This may be
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because the reference count reaches zero or it may be that the
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file system is being forcibly unmounted while there are open files.
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It can be used to reclaim space for
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.Sq open but deleted
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files.
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.Pp
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.Fn VOP_RECLAIM
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is called when a vnode is being reused for a different file system.
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Any file system specific resources associated with the vnode should be
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freed.
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.Sh LOCKS
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For VOP_INACTIVE, the
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.Fa vp
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will be locked on entry.
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Your VOP_INACTIVE code
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must unlock the
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.Fa vp
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prior to returning.
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.Pp
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For VOP_RECLAIM, the
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.Fa vp
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will not be locked on entry and should be left unlocked on return.
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.Sh PSEUDOCODE
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.Bd -literal
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int
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vop_inactive(struct vnode *vp, struct thread *td)
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{
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if (link count of vp == 0) {
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/*
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* Reclaim space in file system for vp.
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*/
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...;
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}
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VOP_UNLOCK(vp, 0, td);
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return 0;
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}
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int
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vop_reclaim(struct vnode *vp, struct thread *td)
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{
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/*
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* Clean out the name cache.
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*/
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cache_purge(vp);
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/*
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* Free file system related data.
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*/
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...;
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return 0;
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}
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.Ed
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.Sh SEE ALSO
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.Xr vnode 9
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.Sh AUTHORS
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This man page was written by
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.An Doug Rabson .
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