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+.\"	$NetBSD: virtdir.3,v 1.4 2014/03/18 18:20:39 riastradh Exp $
+.\"
+.\" Copyright © 2007 Alistair Crooks.  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.
+.\" 3. The name of the author may not be used to endorse or promote
+.\"    products derived from this software without specific prior written
+.\"    permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 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 January 23, 2007
+.Dt VIRTDIR 3
+.Os
+.Sh NAME
+.Nm virtdir
+.Nd Utility routines for virtual directories for refuse operations
+.Sh SYNOPSIS
+.In virtdir.h
+.Ft int
+.Fo virtdir_init
+.Fa "virtdir_t *tree" "struct stat *dir" "struct stat *file" "struct stat *symlink"
+.Fc
+.Ft int
+.Fo virtdir_add
+.Fa "virtdir_t *tree" "const char *name" "size_t namesize" "uint8_t type" "char *target"
+.Fc
+.Ft int
+.Fo virtdir_del
+.Fa "virtdir_t *tree" "const char *name" "size_t namesize"
+.Fc
+.Ft int
+.Fo virtdir_find
+.Fa "virtdir_t *tree" "const char *name" "size_t namesize"
+.Fc
+.Ft int
+.Fo virtdir_find_tgt
+.Fa "virtdir_t *tree" "const char *name" "size_t namesize"
+.Fc
+.Ft void
+.Fo virtdir_drop
+.Fa "virtdir_t *tree"
+.Fc
+.Ft VIRTDIR *
+.Fo openvirtdir
+.Fa "virtdir_t *tree" "const char *directory"
+.Fc
+.Ft virt_dirent_t *
+.Fo readvirtdir
+.Fa "VIRTDIR *dirp"
+.Fc
+.Ft void
+.Fo closevirtdir
+.Fa "VIRTDIR *dirp"
+.Fc
+.Sh DESCRIPTION
+.Nm
+provides virtual directory functionality for the benefit of
+.Xr refuse 3
+file systems (and also for FUSE-based file systems).
+.Pp
+It uses the framework provided by the
+.Xr puffs 3
+subsystem, and, through that, the kernel interface provided by
+.Xr puffs 4 .
+.Pp
+The
+.Nm
+routines build up and manage a list of virtual directory entries.
+Each virtual directory entry is indexed by its full pathname within
+the file system.
+This is consistent with the way that
+.Xr refuse 3
+locates directory entries - by full pathname.
+.Pp
+The list of paths is sorted alphabetically.
+Each of these virtual directory entries has a distinct type -
+file
+.Pq Sq f ,
+directory
+.Pq Sq d ,
+or symbolic link
+.Pq Sq l .
+Additionally, an entry can point to a target - this
+is useful when modeling virtual directory entries which are
+symbolic links.
+The list contains three basic
+.Xr stat 2
+structures, which contain basic information for file, directory
+and symbolic link entries.
+This information can be specified at
+initialization time, and customized within the individual
+getattr operation routines as specified by the
+individual file systems.
+The
+.Nm
+functionality can also make virtual directory entries available
+on a per-directory basis
+to the caller by means of routines analogous to
+.Xr opendir 3 ,
+.Xr readdir 3 ,
+and
+.Xr closedir 3 .
+These are
+.Fn openvirtdir ,
+.Fn readvirtdir ,
+and
+.Fn closevirtdir ,
+respectively.
+.Sh SEE ALSO
+.Xr puffs 3 ,
+.Xr refuse 3 ,
+.Xr puffs 4
+.Sh HISTORY
+An unsupported experimental version of
+.Nm
+first appeared in
+.Nx 5.0 .
+.Sh AUTHORS
+.An Alistair Crooks Aq Mt agc@NetBSD.org