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34 * @(#)vfs_conf.c 8.8 (Berkeley) 3/31/94
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
47 * NOTE1: Code is single entry/single exit to aid debugging
48 * and conversion for kernel multithreading.
50 * NOTE2: Code notes lock state in headers on entry and exit
51 * as an aid to conversion for kernel multithreading
54 #include "opt_bootp.h"
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*/
68 MALLOC_DEFINE(M_MOUNT, "mount", "vfs mount struct");
71 * These define the root filesystem, device, and root filesystem type.
73 dev_t rootdevs[] = { NODEV, NODEV };
74 char *rootdevnames[2];
75 struct vnode *rootvnode;
76 char *mountrootfsname;
78 extern void bootpc_init __P((void));
82 * vfs_init() will set maxvfsconf
83 * to the highest defined type number.
86 struct vfsconf *vfsconf;
89 * Common root mount code shared by all filesystems
91 #define ROOTNAME "root_device"
96 * Common entry point for root mounts
102 * !0 error number (errno.h)
111 * This code is currently supported only for use for
112 * the FFS file system type. This is a matter of
113 * fixing the other file systems, not this code!
116 vfs_mountrootfs(void *unused)
120 struct proc *p = curproc; /* XXX */
129 * New root mount structure
131 if ((err = vfs_rootmountalloc(mountrootfsname, ROOTNAME, &mp))) {
132 printf("rootdev=%p error=%d, ", (void *)rootdev, err);
133 panic("cannot mount root\n");
136 mp->mnt_flag |= MNT_ROOTFS;
143 if (rootdevs[0] == NODEV)
144 rootdevs[0] = rootdev;
145 for (i = 0; i < sizeof(rootdevs) / sizeof(rootdevs[0]); i++) {
146 if (rootdevs[i] == NODEV)
148 rootdev = rootdevs[i];
149 if (rootdev != orootdev) {
150 s = splbio(); /* Overkill, but harmless.. */
151 printf("changing root device to %s\n", rootdevnames[i]);
155 strncpy(mp->mnt_stat.f_mntfromname,
156 rootdevnames[i] ? rootdevnames[i] : ROOTNAME, MNAMELEN - 1);
157 err = VFS_MOUNT(mp, NULL, NULL, NULL, p);
163 * XXX should ask the user for the name in some cases.
164 * Why do we call vfs_unbusy() here and not after ENXIO
169 * free mount struct before failing
170 * (hardly worthwhile with the PANIC eh?)
173 printf("rootdev=%p error=%d, ", (void *)rootdev, err);
174 panic("cannot mount root (2)\n");
178 simple_lock(&mountlist_slock);
181 * Add fs to list of mounted file systems
183 CIRCLEQ_INSERT_HEAD(&mountlist, mp, mnt_list);
185 simple_unlock(&mountlist_slock);
188 /* root mount, update system time from FS specific data*/
189 inittodr(mp->mnt_time);
193 SYSINIT(mountroot, SI_SUB_MOUNT_ROOT, SI_ORDER_FIRST, vfs_mountrootfs, NULL)