2013-12-06 12:04:52 +01:00
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.\" $NetBSD: puffs_node.3,v 1.5 2009/05/13 22:42:31 wiz Exp $
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2011-11-14 12:53:05 +01:00
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.\"
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.\" Copyright (c) 2007 Antti Kantee. All rights reserved.
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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 AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.Dd June 24, 2007
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.Dt PUFFS_NODE 3
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.Os
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.Sh NAME
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.Nm puffs_node
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.Nd puffs node routines
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.Sh LIBRARY
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.Lb libpuffs
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.Sh SYNOPSIS
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.In puffs.h
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.Ft struct puffs_node *
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.Fn puffs_pn_new "struct puffs_usermount *pu" "void *priv"
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.Ft void *
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.Fo puffs_nodewalk_fn
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.Fa "struct puffs_usermount *pu" "struct puffs_node *pn" "void *arg"
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.Fc
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.Ft void *
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.Fo puffs_pn_nodewalk
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.Fa "struct puffs_usermount *pu" "puffs_nodewalk_fn nwfn" "void *arg"
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.Fc
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.Ft void
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.Fn puffs_pn_remove "struct puffs_node *pn"
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.Ft void
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.Fn puffs_pn_put "struct puffs_node *pn"
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.Sh DESCRIPTION
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.Bl -tag -width xxxx
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.It Fn puffs_pn_new pu priv
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Create a new node and attach it to the mountpoint
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.Ar pu .
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The argument
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.Ar priv
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can be used for associating file system specific data with the new
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node and will not be accessed by puffs.
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.It Fn puffs_nodewalk_fn pu pn arg
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A callback for
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.Fn puffs_nodewalk .
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The list of nodes is iterated in the argument
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.Ar pn
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and the argument
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.Ar arg
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is the argument given to
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.Fn puffs_nodewalk .
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.It Fn puffs_nodewalk pu nwfn arg
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Walk all nodes associted with the mountpoint
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.Ar pu
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and call
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.Fn nwfn
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for them.
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The walk is aborted if
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.Fn puffs_nodewalk_fn
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returns a value which is not
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.Dv NULL .
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This value is also returned this function.
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In case the whole set of nodes is traversed,
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.Dv NULL
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is returned.
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This function is useful for example in handling the
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.Fn puffs_fs_sync
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callback, when cached data for every node should be flushed to stable
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storage.
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.It Fn puffs_pn_remove pn
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Signal that a node has been removed from the file system, but do not
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yet release resources associated with the node.
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This will prevent the nodewalk functions from accessing the node.
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If necessary, this is usually called from
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.Fn puffs_node_remove
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and
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.Fn puffs_node_rmdir .
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.It Fn puffs_pn_put pn
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Free all resources associated with node
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.Ar pn .
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This is typically called from
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.Fn puffs_node_reclaim .
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.El
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.Sh SEE ALSO
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.Xr puffs 3
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