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- Implement vfs_mountroot(). This function is called my main() to 

mount the root file system.  If the operator specified the root
  file system type in the kernel configuration file, attempt to
  mount that file system type on the root device.  If the root
  file system type was wildcarded (or unspecified), try all of
  the file systems statically built into the kernel until one
  succeeds.  If no file systems succeed, return an error.  The
  system will recover from this condition.
- Implement vfs_getopsbyname().  This function returns the file
  system ops vector given a file system name.
This commit is contained in:
thorpej 1997-01-31 02:50:36 +00:00
parent d3f790f3d0
commit 68de7ca719
1 changed files with 82 additions and 1 deletions
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83
sys/kern/vfs_subr.c
View File

@ -1,6 +1,7 @@
/* $NetBSD: vfs_subr.c,v 1.57 1996/10/13 02:32:53 christos Exp $ */
/* $NetBSD: vfs_subr.c,v 1.58 1997/01/31 02:50:36 thorpej Exp $ */
/*
* Copyright (c) 1997 Jason R. Thorpe. All rights reserved.
* Copyright (c) 1989, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
@ -60,6 +61,7 @@
#include <sys/domain.h>
#include <sys/mbuf.h>
#include <sys/syscallargs.h>
#include <sys/device.h>
#include <vm/vm.h>
#include <sys/sysctl.h>
@ -91,6 +93,8 @@ TAILQ_HEAD(freelst, vnode) vnode_free_list = /* vnode free list */
struct mntlist mountlist = /* mounted filesystem list */
CIRCLEQ_HEAD_INITIALIZER(mountlist);
struct device *root_device; /* root device */
int vfs_lock __P((struct mount *));
void vfs_unlock __P((struct mount *));
struct mount *getvfs __P((fsid_t *));
@ -1618,3 +1622,80 @@ vfs_shutdown()
else
printf("done\n");
}
/*
* Mount the root file system. If the operator didn't specify a
* file system to use, try all possible file systems until one
* succeeds.
*/
int
vfs_mountroot()
{
extern int (*mountroot) __P((void));
int i;
if (root_device == NULL)
panic("vfs_mountroot: root device unknown");
switch (root_device->dv_class) {
case DV_IFNET:
if (rootdev != NODEV)
panic("vfs_mountroot: rootdev set for DV_IFNET");
break;
case DV_DISK:
if (rootdev == NODEV)
panic("vfs_mountroot: rootdev not set for DV_DISK");
break;
default:
printf("%s: inappropriate for root file system\n",
root_device->dv_xname);
return (ENODEV);
}
/*
* If user specified a file system, use it.
*/
if (mountroot != NULL)
return ((*mountroot)());
/*
* Try each file system currently configured into the kernel.
*/
for (i = 0; i < nvfssw; i++) {
if (vfssw[i] == NULL || vfssw[i]->vfs_mountroot == NULL)
continue;
#ifdef DEBUG
printf("mountroot: trying %s...\n", vfssw[i]->vfs_name);
#endif
if ((*vfssw[i]->vfs_mountroot)() == 0) {
printf("root file system type: %s\n",
vfssw[i]->vfs_name);
return (0);
}
}
printf("no file system for %s", root_device->dv_xname);
if (root_device->dv_class == DV_DISK)
printf(" (dev 0x%x)", rootdev);
printf("\n");
return (EFTYPE);
}
/*
* Given a file system name, look up the vfsops for that
* file system, or return NULL if file system isn't present
* in the kernel.
*/
struct vfsops *
vfs_getopsbyname(name)
const char *name;
{
int i;
for (i = 0; i < nvfssw; i++)
if (vfssw[i] != NULL && strcmp(vfssw[i]->vfs_name, name) == 0)
return (vfssw[i]);
return (NULL);
}