dbddecf49e
machine-independent code and try mounting the devices in the lists instead of guessing alternative root devices in a machine- dependent way. autoconf.c: Reject preposterous slice numbers instead of silently converting them to COMPATIBILITY_SLICE. Don't forget to force slice = COMPATIBILITY_SLICE in the floppy device name. Eliminated most magic numbers and magic device names in setroot(). Fixed dozens of style bugs. vfs_conf.c: Put the actual root device name instead of "root_device" in the mount struct if the actual name is available. This is useful after booting with -s. If it were set in all cases then it could be used to do mount(8)'s ROOTSLICE_HUNT and fsck(8)'s hotroot guess better.
195 lines
5.4 KiB
C
195 lines
5.4 KiB
C
/*
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* Copyright (c) 1989, 1993, 1995
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* The Regents of the University of California. All rights reserved.
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* Copyright (c) 1995 Artisoft, Inc. All Rights Reserved.
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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 acknowledgement:
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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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* @(#)vfs_conf.c 8.8 (Berkeley) 3/31/94
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* $Id: vfs_conf.c,v 1.24 1998/04/20 03:57:30 julian Exp $
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*/
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/*
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* PURPOSE: This file abstracts the root mounting interface from
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* the per file system semantics for handling mounts,
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* the overall intent of which is to move the BSD
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* internals dependence out of the FS code, both to
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* make the FS code more portable and to free up some
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* of the BSD internals so that they may more easily
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* be changed.
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*
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* NOTE1: Code is single entry/single exit to aid debugging
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* and conversion for kernel multithreading.
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*
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* NOTE2: Code notes lock state in headers on entry and exit
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* as an aid to conversion for kernel multithreading
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* on SMP reentrancy
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*/
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#include "opt_devfs.h" /* for SLICE */
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#include "opt_bootp.h"
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#include <sys/param.h> /* dev_t (types.h)*/
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#include <sys/kernel.h>
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#include <sys/systm.h> /* rootvp*/
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#include <sys/proc.h> /* curproc*/
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#include <sys/vnode.h> /* NULLVP*/
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#include <sys/mount.h> /* struct mount*/
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#include <sys/malloc.h> /* M_MOUNT*/
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/*
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* GLOBALS
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*/
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MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
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/*
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* These define the root filesystem, device, and root filesystem type.
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*/
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dev_t rootdevs[] = { NODEV, NODEV };
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char *rootdevnames[2];
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struct vnode *rootvnode;
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char *mountrootfsname;
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#ifdef SLICE
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char rootdevice[32];
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#endif
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#ifdef BOOTP
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extern void bootpc_init __P((void));
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#endif
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/*
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* vfs_init() will set maxvfsconf
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* to the highest defined type number.
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*/
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int maxvfsconf;
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struct vfsconf *vfsconf;
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/*
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* Common root mount code shared by all filesystems
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*/
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#define ROOTNAME "root_device"
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/*
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* vfs_mountrootfs
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*
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* Common entry point for root mounts
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*
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* PARAMETERS:
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* NONE
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*
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* RETURNS: 0 Success
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* !0 error number (errno.h)
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*
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* LOCK STATE:
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* ENTRY
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* <no locks held>
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* EXIT
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* <no locks held>
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*
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* NOTES:
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* This code is currently supported only for use for
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* the FFS file system type. This is a matter of
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* fixing the other file systems, not this code!
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*/
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static void
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vfs_mountrootfs(void *unused)
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{
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struct mount *mp;
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int i, err;
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struct proc *p = curproc; /* XXX */
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dev_t orootdev;
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#ifdef BOOTP
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bootpc_init();
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#endif
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/*
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* New root mount structure
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*/
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if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) {
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printf("error %d: ", err);
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panic("cannot mount root\n");
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return ;
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}
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mp->mnt_flag |= MNT_ROOTFS;
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/*
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* Attempt the mount
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*/
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err = ENXIO;
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orootdev = rootdev;
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if (rootdevs[0] == NODEV)
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rootdevs[0] = rootdev;
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for (i = 0; i < sizeof(rootdevs) / sizeof(rootdevs[0]); i++) {
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if (rootdevs[i] == NODEV)
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break;
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rootdev = rootdevs[i];
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if (rootdev != orootdev) {
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printf("changing root device to %s\n", rootdevnames[i]);
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orootdev = rootdev;
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}
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strncpy(mp->mnt_stat.f_mntfromname,
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rootdevnames[i] ? rootdevnames[i] : ROOTNAME, MNAMELEN - 1);
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err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
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if (err != ENXIO)
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break;
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}
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if (err) {
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/*
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* XXX should ask the user for the name in some cases.
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* Why do we call vfs_unbusy() here and not after ENXIO
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* is returned above?
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*/
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vfs_unbusy(mp, p);
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/*
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* free mount struct before failing
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* (hardly worthwhile with the PANIC eh?)
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*/
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free( mp, M_MOUNT);
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printf("error %d: ", err);
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panic("cannot mount root (2)\n");
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return;
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}
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simple_lock(&mountlist_slock);
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/*
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* Add fs to list of mounted file systems
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*/
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CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
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simple_unlock(&mountlist_slock);
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vfs_unbusy(mp, p);
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/* root mount, update system time from FS specific data*/
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inittodr(mp->mnt_time);
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return;
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}
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SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, vfs_mountrootfs, NULL)
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