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 * $FreeBSD$ 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 <sys/param.h> /* dev_t (types.h)*/ 55 #include <sys/systm.h> /* rootvp*/ 56 #include <sys/proc.h> /* curproc*/ 57 #include <sys/vnode.h> /* NULLVP*/ 58 #include <sys/mount.h> /* struct mount*/ 59 #include <sys/malloc.h> /* M_MOUNT*/ 60 61 /* 62 * GLOBALS 63 */ 64 65 /* 66 * These define the root filesystem, device, and root filesystem type. 67 */ 68 struct mount *rootfs; 69 struct vnode *rootvnode; 70 char *mountrootfsname; 71 72 /* 73 * vfs_init() will set maxvfsconf 74 * to the highest defined type number. 75 */ 76 int maxvfsconf; 77 struct vfsconf *vfsconf; 78 79 /* 80 * Common root mount code shared by all filesystems 81 */ 82 #define ROOTNAME "root_device" 83 84 /* 85 * vfs_mountrootfs 86 * 87 * Common entry point for root mounts 88 * 89 * PARAMETERS: 90 * fsname name of the filesystem 91 * 92 * RETURNS: 0 Success 93 * !0 error number (errno.h) 94 * 95 * LOCK STATE: 96 * ENTRY 97 * <no locks held> 98 * EXIT 99 * <no locks held> 100 * 101 * NOTES: 102 * This code is currently supported only for use for 103 * the FFS file system type. This is a matter of 104 * fixing the other file systems, not this code! 105 */ 106 int 107 vfs_mountrootfs(fsname) 108 char *fsname; 109 { 110 struct mount *mp; 111 int err = 0; 112 struct proc *p = curproc; /* XXX */ 113 114 /* 115 * New root mount structure 116 */ 117 err = vfs_rootmountalloc(fsname, ROOTNAME, &mp); 118 if (err) 119 return (err); 120 mp->mnt_flag |= MNT_ROOTFS; 121 122 /* 123 * Attempt the mount 124 */ 125 err = VFS_MOUNT(mp, NULL, NULL, NULL, p); 126 if (err) 127 goto error_2; 128 129 simple_lock(&mountlist_slock); 130 /* Add fs to list of mounted file systems*/ 131 CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list); 132 simple_unlock(&mountlist_slock); 133 134 vfs_unbusy(mp, p); 135 136 /* root mount, update system time from FS specific data*/ 137 inittodr(mp->mnt_time); 138 139 goto success; 140 141 142 error_2: /* mount error*/ 143 144 vfs_unbusy(mp, p); 145 146 error_1: /* lock error*/ 147 148 /* free mount struct before failing*/ 149 free( mp, M_MOUNT); 150 151 success: 152 return( err); 153 } 154