135 lines
4.4 KiB
C
135 lines
4.4 KiB
C
/* $NetBSD: amfs_union.c,v 1.1.1.7 2004/11/27 01:00:39 christos Exp $ */
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/*
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* Copyright (c) 1997-2004 Erez Zadok
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* Copyright (c) 1990 Jan-Simon Pendry
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry at Imperial College, London.
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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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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgment:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS 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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*
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* Id: amfs_union.c,v 1.18 2004/01/06 03:56:20 ezk Exp
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*
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*/
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/*
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* Union automounter file system
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*/
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif /* HAVE_CONFIG_H */
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#include <am_defs.h>
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#include <amd.h>
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/****************************************************************************
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*** FORWARD DEFINITIONS ***
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****************************************************************************/
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static int create_amfs_union_node(char *dir, opaque_t arg);
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static void amfs_union_mounted(mntfs *mf);
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/****************************************************************************
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*** OPS STRUCTURES ***
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****************************************************************************/
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am_ops amfs_union_ops =
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{
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"union",
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amfs_generic_match,
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0, /* amfs_union_init */
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amfs_toplvl_mount,
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amfs_toplvl_umount,
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amfs_generic_lookup_child,
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amfs_generic_mount_child,
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amfs_generic_readdir,
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0, /* amfs_union_readlink */
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amfs_union_mounted,
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0, /* amfs_union_umounted */
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amfs_generic_find_srvr,
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0, /* amfs_union_get_wchan */
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FS_MKMNT | FS_NOTIMEOUT | FS_BACKGROUND | FS_AMQINFO | FS_DIRECTORY,
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#ifdef HAVE_FS_AUTOFS
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AUTOFS_UNION_FS_FLAGS,
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#endif /* HAVE_FS_AUTOFS */
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};
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/*
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* Create a reference to a union'ed entry
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* XXX: this function may not be used anywhere...
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*/
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static int
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create_amfs_union_node(char *dir, opaque_t arg)
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{
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if (!STREQ(dir, "/defaults")) {
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int error = 0;
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am_node *am;
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am = amfs_generic_lookup_child(arg, dir, &error, VLOOK_CREATE);
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if (am && error < 0)
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am = amfs_generic_mount_child(am, &error);
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if (error > 0) {
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errno = error; /* XXX */
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plog(XLOG_ERROR, "unionfs: could not mount %s: %m", dir);
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}
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return error;
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}
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return 0;
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}
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static void
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amfs_union_mounted(mntfs *mf)
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{
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int index;
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am_node *mp;
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amfs_mkcacheref(mf);
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/*
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* Having made the union mount point,
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* populate all the entries...
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*/
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for (mp = get_first_exported_ap(&index);
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mp;
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mp = get_next_exported_ap(&index)) {
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if (mp->am_mnt == mf) {
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/* return value from create_amfs_union_node is ignored by mapc_keyiter */
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(void) mapc_keyiter((mnt_map *) mp->am_mnt->mf_private,
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create_amfs_union_node,
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mp);
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break;
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}
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}
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}
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