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/*
* Copyright (c) 1997-2003 Erez Zadok
* Copyright (c) 1989 Jan-Simon Pendry
* Copyright (c) 1989 Imperial College of Science, Technology & Medicine
* Copyright (c) 1989 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgment:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* %W% (Berkeley) %G%
*
* $Id: amfs_inherit.c,v 1.3.2.3 2002/12/27 22:44:31 ezk Exp $
*
*/
/*
* Inheritance file system.
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
/*
* This implements a filesystem restart.
*
* This is a *gross* hack - it knows far too
* much about the way other parts of the
* system work. See restart.c too.
*/
static char *amfs_inherit_match(am_opts *fo);
static int amfs_inherit_fmount(mntfs *mf);
static int amfs_inherit_fumount(mntfs *mf);
static int amfs_inherit_init(mntfs *mf);
static int amfs_inherit_mount(am_node *mp);
/*
* Ops structure
*/
am_ops amfs_inherit_ops =
{
"inherit",
amfs_inherit_match,
amfs_inherit_init,
amfs_inherit_mount,
amfs_inherit_fmount,
amfs_auto_fumount,
amfs_inherit_fumount,
amfs_error_lookuppn,
amfs_error_readdir,
0, /* amfs_inherit_readlink */
0, /* amfs_inherit_mounted */
0, /* amfs_inherit_umounted */
find_amfs_auto_srvr,
FS_DISCARD
};
/*
* This should never be called.
*/
static char *
amfs_inherit_match(am_opts *fo)
{
plog(XLOG_FATAL, "amfs_inherit_match called!");
return 0;
}
static int
amfs_inherit_init(mntfs *mf)
{
mntfs *mf_link = (mntfs *) mf->mf_private;
if (mf_link == 0) {
plog(XLOG_ERROR, "Remount collision on %s?", mf->mf_mount);
plog(XLOG_FATAL, "Attempting to init not-a-filesystem");
return EINVAL;
}
if (mf_link->mf_ops->fs_init)
return (*mf_link->mf_ops->fs_init) (mf_link);
return 0;
}
/*
* Take the linked mount point and
* propagate.
*/
static mntfs *
amfs_inherit_inherit(mntfs *mf)
{
mntfs *mf_link = (mntfs *) mf->mf_private;
if (mf_link == 0) {
plog(XLOG_FATAL, "Attempting to inherit not-a-filesystem");
return 0; /* XXX */
}
mf_link->mf_fo = mf->mf_fo;
/*
* Discard the old map.
* Don't call am_unmounted since this
* node was never really mounted in the
* first place.
*/
mf->mf_private = 0;
free_mntfs(mf);
/*
* Free the dangling reference
* to the mount link.
*/
free_mntfs(mf_link);
/*
* Get a hold of the other entry
*/
mf_link->mf_flags &= ~MFF_RESTART;
/* Say what happened */
plog(XLOG_INFO, "restarting %s on %s", mf_link->mf_info, mf_link->mf_mount);
return mf_link;
}
static int
amfs_inherit_mount(am_node *mp)
{
mntfs *newmf = amfs_inherit_inherit(mp->am_mnt);
if (newmf) {
mp->am_mnt = newmf;
/*
* XXX - must do the am_mounted call here
*/
if (newmf->mf_ops->fs_flags & FS_MBACKGROUND)
am_mounted(mp);
new_ttl(mp);
return 0;
}
return EINVAL;
}
static int
amfs_inherit_fmount(mntfs *mf)
{
am_node *mp = find_mf(mf);
if (mp)
return amfs_inherit_mount(mp);
return amfs_inherit_inherit(mf) ? 0 : EINVAL;
}
static int
amfs_inherit_fumount(mntfs *mf)
{
/*
* Always succeed
*/
return 0;
}
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