2 * Copyright (c) 1992, 1993, 1995
3 * The Regents of the University of California. All rights reserved.
5 * This code is derived from software donated to Berkeley by
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 * must display the following acknowledgement:
18 * This product includes software developed by the University of
19 * California, Berkeley and its contributors.
20 * 4. Neither the name of the University nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * @(#)kernfs_vfsops.c 8.10 (Berkeley) 5/14/95
37 * $Id: kernfs_vfsops.c,v 1.22 1998/05/06 05:29:33 msmith Exp $
41 * Kernel params Filesystem
44 #include <sys/param.h>
45 #include <sys/systm.h>
46 #include <sys/kernel.h>
49 #include <sys/vnode.h>
50 #include <sys/mount.h>
51 #include <sys/malloc.h>
53 #include <miscfs/kernfs/kernfs.h>
55 static MALLOC_DEFINE(M_KERNFSMNT, "KERNFS mount", "KERNFS mount structure");
57 dev_t rrootdev = NODEV;
59 static int cdevvp __P((dev_t dev, struct vnode **vpp));
60 static void kernfs_get_rrootdev __P((void));
61 static int kernfs_init __P((struct vfsconf *vfsp));
62 static int kernfs_mount __P((struct mount *mp, char *path, caddr_t data,
63 struct nameidata *ndp, struct proc *p));
64 static int kernfs_start __P((struct mount *mp, int flags, struct proc *p));
65 static int kernfs_unmount __P((struct mount *mp, int mntflags,
67 static int kernfs_root __P((struct mount *mp, struct vnode **vpp));
68 static int kernfs_statfs __P((struct mount *mp, struct statfs *sbp,
83 int bmaj = major(rootdev);
87 /* Already did it once. */
93 panic("root dev has no bdevsw");
97 for (cmaj = 0; cmaj < nchrdev; cmaj++) {
98 rrootdev = makedev(cmaj, minor(rootdev));
99 if (chrtoblk(rrootdev) == rootdev)
103 printf("kernfs_get_rrootdev: no raw root device\n");
107 * Mount the Kernel params filesystem
110 kernfs_mount(mp, path, data, ndp, p)
114 struct nameidata *ndp;
119 struct kernfs_mount *fmp;
122 #ifdef KERNFS_DIAGNOSTIC
123 printf("kernfs_mount(mp = %x)\n", mp);
129 if (mp->mnt_flag & MNT_UPDATE)
132 MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
133 M_KERNFSMNT, M_WAITOK); /* XXX */
135 error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp); /* XXX */
137 FREE(fmp, M_KERNFSMNT);
142 rvp->v_flag |= VROOT;
143 #ifdef KERNFS_DIAGNOSTIC
144 printf("kernfs_mount: root vp = %x\n", rvp);
147 mp->mnt_flag |= MNT_LOCAL;
148 mp->mnt_data = (qaddr_t) fmp;
151 (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
152 bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
153 bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
154 bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
155 (void)kernfs_statfs(mp, &mp->mnt_stat, p);
156 #ifdef KERNFS_DIAGNOSTIC
157 printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
160 kernfs_get_rrootdev();
165 kernfs_start(mp, flags, p)
174 kernfs_unmount(mp, mntflags, p)
181 struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
183 #ifdef KERNFS_DIAGNOSTIC
184 printf("kernfs_unmount(mp = %x)\n", mp);
187 if (mntflags & MNT_FORCE)
191 * Clear out buffer cache. I don't think we
192 * ever get anything cached at this level at the
193 * moment, but who knows...
195 if (rootvp->v_usecount > 1)
197 #ifdef KERNFS_DIAGNOSTIC
198 printf("kernfs_unmount: calling vflush\n");
200 error = vflush(mp, rootvp, flags);
204 #ifdef KERNFS_DIAGNOSTIC
205 vprint("kernfs root", rootvp);
208 * Release reference on underlying root vnode
212 * And blow it away for future re-use
216 * Finally, throw away the kernfs_mount structure
218 free(mp->mnt_data, M_KERNFSMNT); /* XXX */
228 struct proc *p = curproc; /* XXX */
231 #ifdef KERNFS_DIAGNOSTIC
232 printf("kernfs_root(mp = %x)\n", mp);
236 * Return locked reference to root.
238 vp = VFSTOKERNFS(mp)->kf_root;
240 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
246 kernfs_statfs(mp, sbp, p)
251 #ifdef KERNFS_DIAGNOSTIC
252 printf("kernfs_statfs(mp = %x)\n", mp);
256 sbp->f_bsize = DEV_BSIZE;
257 sbp->f_iosize = DEV_BSIZE;
258 sbp->f_blocks = 2; /* 1K to keep df happy */
263 if (sbp != &mp->mnt_stat) {
264 sbp->f_type = mp->mnt_vfc->vfc_typenum;
265 bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
266 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
267 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
272 static struct vfsops kernfs_vfsops = {
286 VFS_SET(kernfs_vfsops, kernfs, VFCF_SYNTHETIC);