/* $NetBSD: amfs_union.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */
/*
* Copyright (c) 1997-2014 Erez Zadok
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry at Imperial College, London.
*
* 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. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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.
*
*
* File: am-utils/amd/amfs_union.c
*
*/
/*
* Union automounter file system
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/****************************************************************************
*** FORWARD DEFINITIONS ***
****************************************************************************/
static int create_amfs_union_node(char *dir, opaque_t arg);
static void amfs_union_mounted(mntfs *mf);
/****************************************************************************
*** OPS STRUCTURES ***
****************************************************************************/
am_ops amfs_union_ops =
{
"union",
amfs_generic_match,
0, /* amfs_union_init */
amfs_toplvl_mount,
amfs_toplvl_umount,
amfs_generic_lookup_child,
amfs_generic_mount_child,
amfs_generic_readdir,
0, /* amfs_union_readlink */
amfs_union_mounted,
0, /* amfs_union_umounted */
amfs_generic_find_srvr,
0, /* amfs_union_get_wchan */
FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY,
#ifdef HAVE_FS_AUTOFS
AUTOFS_UNION_FS_FLAGS,
#endif /* HAVE_FS_AUTOFS */
};
/*
* Create a reference to a union'ed entry
* XXX: this function may not be used anywhere...
*/
static int
create_amfs_union_node(char *dir, opaque_t arg)
{
if (!STREQ(dir, "/defaults")) {
int error = 0;
am_node *am;
am = amfs_generic_lookup_child(arg, dir, &error, VLOOK_CREATE);
if (am && error < 0)
(void)amfs_generic_mount_child(am, &error);
if (error > 0) {
errno = error; /* XXX */
plog(XLOG_ERROR, "unionfs: could not mount %s: %m", dir);
}
return error;
}
return 0;
}
static void
amfs_union_mounted(mntfs *mf)
{
int index;
am_node *mp;
amfs_mkcacheref(mf);
/*
* Having made the union mount point,
* populate all the entries...
*/
for (mp = get_first_exported_ap(&index);
mp;
mp = get_next_exported_ap(&index)) {
if (mp->am_al->al_mnt == mf) {
/* return value from create_amfs_union_node is ignored by mapc_keyiter */
(void) mapc_keyiter((mnt_map *) mp->am_al->al_mnt->mf_private,
create_amfs_union_node,
mp);
break;
}
}
}
