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+.\"	$NetBSD: puffs_node.3,v 1.6 2021/08/04 09:31:25 andvar Exp $
+.\"
+.\" Copyright (c) 2007 Antti Kantee.  All rights reserved.
+.\"
+.\" 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
+.\"
+.Dd June 24, 2007
+.Dt PUFFS_NODE 3
+.Os
+.Sh NAME
+.Nm puffs_node
+.Nd puffs node routines
+.Sh LIBRARY
+.Lb libpuffs
+.Sh SYNOPSIS
+.In puffs.h
+.Ft struct puffs_node *
+.Fn puffs_pn_new "struct puffs_usermount *pu" "void *priv"
+.Ft void *
+.Fo puffs_nodewalk_fn
+.Fa "struct puffs_usermount *pu" "struct puffs_node *pn" "void *arg"
+.Fc
+.Ft void *
+.Fo puffs_pn_nodewalk
+.Fa "struct puffs_usermount *pu" "puffs_nodewalk_fn nwfn" "void *arg"
+.Fc
+.Ft void
+.Fn puffs_pn_remove "struct puffs_node *pn"
+.Ft void
+.Fn puffs_pn_put "struct puffs_node *pn"
+.Sh DESCRIPTION
+.Bl -tag -width xxxx
+.It Fn puffs_pn_new pu priv
+Create a new node and attach it to the mountpoint
+.Ar pu .
+The argument
+.Ar priv
+can be used for associating file system specific data with the new
+node and will not be accessed by puffs.
+.It Fn puffs_nodewalk_fn pu pn arg
+A callback for
+.Fn puffs_nodewalk .
+The list of nodes is iterated in the argument
+.Ar pn
+and the argument
+.Ar arg
+is the argument given to
+.Fn puffs_nodewalk .
+.It Fn puffs_nodewalk pu nwfn arg
+Walk all nodes associated with the mountpoint
+.Ar pu
+and call
+.Fn nwfn
+for them.
+The walk is aborted if
+.Fn puffs_nodewalk_fn
+returns a value which is not
+.Dv NULL .
+This value is also returned this function.
+In case the whole set of nodes is traversed,
+.Dv NULL
+is returned.
+This function is useful for example in handling the
+.Fn puffs_fs_sync
+callback, when cached data for every node should be flushed to stable
+storage.
+.It Fn puffs_pn_remove pn
+Signal that a node has been removed from the file system, but do not
+yet release resources associated with the node.
+This will prevent the nodewalk functions from accessing the node.
+If necessary, this is usually called from
+.Fn puffs_node_remove
+and
+.Fn puffs_node_rmdir .
+.It Fn puffs_pn_put pn
+Free all resources associated with node
+.Ar pn .
+This is typically called from
+.Fn puffs_node_reclaim .
+.El
+.Sh SEE ALSO
+.Xr puffs 3