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/*
* Copyright (c) 1989, 1993, 1995
* The Regents of the University of California. All rights reserved.
* Copyright (c) 1995 Artisoft, Inc. 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* 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.
*
* @(#)vfs_conf.c 8.8 (Berkeley) 3/31/94
* $Id: vfs_conf.c,v 1.30 1999/07/03 08:24:00 phk Exp $
*/
/*
* PURPOSE: This file abstracts the root mounting interface from
* the per file system semantics for handling mounts,
* the overall intent of which is to move the BSD
* internals dependence out of the FS code, both to
* make the FS code more portable and to free up some
* of the BSD internals so that they may more easily
* be changed.
*
* NOTE1: Code is single entry/single exit to aid debugging
* and conversion for kernel multithreading.
*
* NOTE2: Code notes lock state in headers on entry and exit
* as an aid to conversion for kernel multithreading
* on SMP reentrancy
*/
#include "opt_bootp.h"
#include <sys/param.h> /* dev_t (types.h)*/
#include <sys/kernel.h>
#include <sys/systm.h> /* rootvp*/
#include <sys/proc.h> /* curproc*/
#include <sys/vnode.h> /* NULLVP*/
#include <sys/mount.h> /* struct mount*/
#include <sys/malloc.h> /* M_MOUNT*/
/*
* GLOBALS
*/
MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
/*
* These define the root filesystem, device, and root filesystem type.
*/
dev_t rootdevs[] = { NODEV, NODEV };
char *rootdevnames[2];
struct vnode *rootvnode;
char *mountrootfsname;
#ifdef BOOTP
extern void bootpc_init __P((void));
#endif
/*
* vfs_init() will set maxvfsconf
* to the highest defined type number.
*/
int maxvfsconf;
struct vfsconf *vfsconf;
/*
* Common root mount code shared by all filesystems
*/
#define ROOTNAME "root_device"
/*
* vfs_mountrootfs
*
* Common entry point for root mounts
*
* PARAMETERS:
* NONE
*
* RETURNS: 0 Success
* !0 error number (errno.h)
*
* LOCK STATE:
* ENTRY
* <no locks held>
* EXIT
* <no locks held>
*
* NOTES:
* This code is currently supported only for use for
* the FFS file system type. This is a matter of
* fixing the other file systems, not this code!
*/
static void
vfs_mountrootfs(void *unused)
{
struct mount *mp;
int err;
struct proc *p = curproc; /* XXX */
int s;
int i;
dev_t orootdev;
#ifdef BOOTP
bootpc_init();
#endif
/*
* New root mount structure
*/
if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) {
printf("rootdev=%p error=%d, ", (void *)rootdev, err);
panic("cannot mount root\n");
return ;
}
mp->mnt_flag |= MNT_ROOTFS;
/*
* Attempt the mount
*/
err = ENXIO;
orootdev = rootdev;
if (rootdevs[0] == NODEV)
rootdevs[0] = rootdev;
for (i = 0; i < sizeof(rootdevs) / sizeof(rootdevs[0]); i++) {
if (rootdevs[i] == NODEV)
break;
rootdev = rootdevs[i];
if (rootdev != orootdev) {
s = splbio(); /* Overkill, but harmless.. */
printf("changing root device to %s\n", rootdevnames[i]);
splx(s);
orootdev = rootdev;
}
strncpy(mp->mnt_stat.f_mntfromname,
rootdevnames[i] ? rootdevnames[i] : ROOTNAME, MNAMELEN - 1);
err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
if (err != ENXIO)
break;
}
if (err) {
/*
* XXX should ask the user for the name in some cases.
* Why do we call vfs_unbusy() here and not after ENXIO
* is returned above?
*/
vfs_unbusy(mp, p);
/*
* free mount struct before failing
* (hardly worthwhile with the PANIC eh?)
*/
free( mp, M_MOUNT);
printf("rootdev=%p error=%d, ", (void *)rootdev, err);
panic("cannot mount root (2)\n");
return;
}
simple_lock(&mountlist_slock);
/*
* Add fs to list of mounted file systems
*/
CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
simple_unlock(&mountlist_slock);
vfs_unbusy(mp, p);
/* root mount, update system time from FS specific data*/
inittodr(mp->mnt_time);
return;
}
SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, vfs_mountrootfs, NULL)
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