vfs_mount.c revision 32358
1/* 2 * Copyright (c) 1989, 1993, 1995 3 * The Regents of the University of California. All rights reserved. 4 * Copyright (c) 1995 Artisoft, Inc. All Rights Reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. All advertising materials mentioning features or use of this software 15 * must display the following acknowledgement: 16 * This product includes software developed by the University of 17 * California, Berkeley and its contributors. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)vfs_conf.c 8.8 (Berkeley) 3/31/94 35 * $Id: vfs_conf.c,v 1.19 1997/12/01 11:34:41 julian Exp $ 36 */ 37 38/* 39 * PURPOSE: This file abstracts the root mounting interface from 40 * the per file system semantics for handling mounts, 41 * the overall intent of which is to move the BSD 42 * internals dependence out of the FS code, both to 43 * make the FS code more portable and to free up some 44 * of the BSD internals so that they may more easily 45 * be changed. 46 * 47 * NOTE1: Code is single entry/single exit to aid debugging 48 * and conversion for kernel multithreading. 49 * 50 * NOTE2: Code notes lock state in headers on entry and exit 51 * as an aid to conversion for kernel multithreading 52 * on SMP reentrancy 53 */ 54#include "opt_bootp.h" 55 56#include <sys/param.h> /* dev_t (types.h)*/ 57#include <sys/kernel.h> 58#include <sys/systm.h> /* rootvp*/ 59#include <sys/proc.h> /* curproc*/ 60#include <sys/vnode.h> /* NULLVP*/ 61#include <sys/mount.h> /* struct mount*/ 62#include <sys/malloc.h> /* M_MOUNT*/ 63 64/* 65 * GLOBALS 66 */ 67 68MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct"); 69 70/* 71 * These define the root filesystem, device, and root filesystem type. 72 */ 73struct mount *rootfs; 74struct vnode *rootvnode; 75char *mountrootfsname; 76#ifdef BOOTP 77extern void bootpc_init __P((void)); 78#endif 79 80/* 81 * vfs_init() will set maxvfsconf 82 * to the highest defined type number. 83 */ 84int maxvfsconf; 85struct vfsconf *vfsconf; 86 87/* 88 * Common root mount code shared by all filesystems 89 */ 90#define ROOTNAME "root_device" 91 92/* 93 * vfs_mountrootfs 94 * 95 * Common entry point for root mounts 96 * 97 * PARAMETERS: 98 * NONE 99 * 100 * RETURNS: 0 Success 101 * !0 error number (errno.h) 102 * 103 * LOCK STATE: 104 * ENTRY 105 * <no locks held> 106 * EXIT 107 * <no locks held> 108 * 109 * NOTES: 110 * This code is currently supported only for use for 111 * the FFS file system type. This is a matter of 112 * fixing the other file systems, not this code! 113 */ 114static void 115vfs_mountrootfs(void *unused) 116{ 117 struct mount *mp; 118 int err = 0; 119 struct proc *p = curproc; /* XXX */ 120 121#ifdef BOOTP 122 bootpc_init(); 123#endif 124 /* 125 * New root mount structure 126 */ 127 if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) { 128 printf("error %d: ", err); 129 panic("cannot mount root\n"); 130 return ; 131 } 132 mp->mnt_flag |= MNT_ROOTFS; 133 134 /* 135 * Attempt the mount 136 */ 137 err = VFS_MOUNT(mp, NULL, NULL, NULL, p); 138 if (err) { 139 vfs_unbusy(mp, p); 140 /* 141 * free mount struct before failing 142 * (hardly worthwhile with the PANIC eh?) 143 */ 144 free( mp, M_MOUNT); 145 printf("error %d: ", err); 146 panic("cannot mount root (2)\n"); 147 return; 148 } 149 150 simple_lock(&mountlist_slock); 151 152 /* 153 * Add fs to list of mounted file systems 154 */ 155 CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list); 156 157 simple_unlock(&mountlist_slock); 158 vfs_unbusy(mp, p); 159 160 /* root mount, update system time from FS specific data*/ 161 inittodr(mp->mnt_time); 162 return; 163} 164 165SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, vfs_mountrootfs, NULL) 166 167