diff options
Diffstat (limited to 'sys/kern/vfs_mount.c')
| -rw-r--r-- | sys/kern/vfs_mount.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/sys/kern/vfs_mount.c b/sys/kern/vfs_mount.c new file mode 100644 index 0000000..a7a830f --- /dev/null +++ b/sys/kern/vfs_mount.c @@ -0,0 +1,190 @@ +/* + * 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 1.25 1998/06/09 12:52:33 bde 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 i, err; + struct proc *p = curproc; /* XXX */ + dev_t orootdev; + +#ifdef BOOTP + bootpc_init(); +#endif + /* + * New root mount structure + */ + if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) { + printf("error %d: ", 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) { + printf("changing root device to %s\n", rootdevnames[i]); + 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("error %d: ", 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) + |
