201 lines
4.9 KiB
C
201 lines
4.9 KiB
C
/*
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* Copyright (c) 1997-2001 Erez Zadok
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* Copyright (c) 1989 Jan-Simon Pendry
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* Copyright (c) 1989 Imperial College of Science, Technology & Medicine
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* Copyright (c) 1989 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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* %W% (Berkeley) %G%
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*
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* $Id: amfs_inherit.c,v 1.1.1.3 2001/05/13 17:34:05 veego Exp $
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*
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*/
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/*
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* Inheritance 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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* This implements a filesystem restart.
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*
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* This is a *gross* hack - it knows far too
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* much about the way other parts of the
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* system work. See restart.c too.
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*/
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static char *amfs_inherit_match(am_opts *fo);
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static int amfs_inherit_fmount(mntfs *mf);
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static int amfs_inherit_fumount(mntfs *mf);
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static int amfs_inherit_init(mntfs *mf);
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static int amfs_inherit_mount(am_node *mp);
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/*
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* Ops structure
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*/
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am_ops amfs_inherit_ops =
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{
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"inherit",
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amfs_inherit_match,
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amfs_inherit_init,
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amfs_inherit_mount,
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amfs_inherit_fmount,
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amfs_auto_fumount,
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amfs_inherit_fumount,
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amfs_error_lookuppn,
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amfs_error_readdir,
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0, /* amfs_inherit_readlink */
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0, /* amfs_inherit_mounted */
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0, /* amfs_inherit_umounted */
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find_amfs_auto_srvr,
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FS_DISCARD
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};
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/*
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* This should never be called.
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*/
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static char *
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amfs_inherit_match(am_opts *fo)
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{
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plog(XLOG_FATAL, "amfs_inherit_match called!");
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return 0;
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}
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static int
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amfs_inherit_init(mntfs *mf)
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{
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mntfs *mf_link = (mntfs *) mf->mf_private;
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if (mf_link == 0) {
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plog(XLOG_ERROR, "Remount collision on %s?", mf->mf_mount);
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plog(XLOG_FATAL, "Attempting to init not-a-filesystem");
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return EINVAL;
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}
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if (mf_link->mf_ops->fs_init)
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return (*mf_link->mf_ops->fs_init) (mf_link);
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return 0;
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}
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/*
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* Take the linked mount point and
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* propagate.
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*/
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static mntfs *
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amfs_inherit_inherit(mntfs *mf)
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{
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mntfs *mf_link = (mntfs *) mf->mf_private;
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if (mf_link == 0) {
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plog(XLOG_FATAL, "Attempting to inherit not-a-filesystem");
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return 0; /* XXX */
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}
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mf_link->mf_fo = mf->mf_fo;
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/*
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* Discard the old map.
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* Don't call am_unmounted since this
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* node was never really mounted in the
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* first place.
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*/
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mf->mf_private = 0;
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free_mntfs(mf);
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/*
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* Free the dangling reference
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* to the mount link.
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*/
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free_mntfs(mf_link);
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/*
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* Get a hold of the other entry
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*/
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mf_link->mf_flags &= ~MFF_RESTART;
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/* Say what happened */
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plog(XLOG_INFO, "restarting %s on %s", mf_link->mf_info, mf_link->mf_mount);
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return mf_link;
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}
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static int
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amfs_inherit_mount(am_node *mp)
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{
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mntfs *newmf = amfs_inherit_inherit(mp->am_mnt);
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if (newmf) {
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mp->am_mnt = newmf;
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/*
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* XXX - must do the am_mounted call here
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*/
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if (newmf->mf_ops->fs_flags & FS_MBACKGROUND)
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am_mounted(mp);
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new_ttl(mp);
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return 0;
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}
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return EINVAL;
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}
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static int
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amfs_inherit_fmount(mntfs *mf)
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{
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am_node *mp = find_mf(mf);
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if (mp)
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return amfs_inherit_mount(mp);
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return amfs_inherit_inherit(mf) ? 0 : EINVAL;
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}
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static int
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amfs_inherit_fumount(mntfs *mf)
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{
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/*
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* Always succeed
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*/
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return 0;
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}
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