initial import of NetBSD tree

3 files changed, 1119 insertions, 0 deletions

diff --git a/sys/miscfs/kernfs/kernfs.h b/sys/miscfs/kernfs/kernfs.h
new file mode 100644
index 00000000000..88434ff093f
--- /dev/null
+++ b/sys/miscfs/kernfs/kernfs.h
@@ -0,0 +1,58 @@
+/*	$NetBSD: kernfs.h,v 1.9 1995/03/29 22:08:22 briggs Exp $	*/
+
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software donated to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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.
+ *
+ *	@(#)kernfs.h	8.5 (Berkeley) 6/15/94
+ */
+
+#define	_PATH_KERNFS	"/kern"		/* Default mountpoint */
+
+#ifdef _KERNEL
+struct kernfs_mount {
+	struct vnode	*kf_root;	/* Root node */
+};
+
+struct kernfs_node {
+	struct kern_target *kf_kt;
+};
+
+#define VFSTOKERNFS(mp)	((struct kernfs_mount *)((mp)->mnt_data))
+#define	VTOKERN(vp) ((struct kernfs_node *)(vp)->v_data)
+
+extern int (**kernfs_vnodeop_p)();
+extern struct vfsops kernfs_vfsops;
+extern dev_t rrootdev;
+#endif /* _KERNEL */
diff --git a/sys/miscfs/kernfs/kernfs_vfsops.c b/sys/miscfs/kernfs/kernfs_vfsops.c
new file mode 100644
index 00000000000..e224cabed8c
--- /dev/null
+++ b/sys/miscfs/kernfs/kernfs_vfsops.c
@@ -0,0 +1,314 @@
+/*	$NetBSD: kernfs_vfsops.c,v 1.24 1995/06/18 14:47:27 cgd Exp $	*/
+
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software donated to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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.
+ *
+ *	@(#)kernfs_vfsops.c	8.5 (Berkeley) 6/15/94
+ */
+
+/*
+ * Kernel params Filesystem
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/conf.h>
+#include <sys/types.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/malloc.h>
+
+#include <miscfs/specfs/specdev.h>
+#include <miscfs/kernfs/kernfs.h>
+
+dev_t rrootdev = NODEV;
+
+kernfs_init()
+{
+
+}
+
+void
+kernfs_get_rrootdev()
+{
+	static int tried = 0;
+	int cmaj;
+
+	if (tried) {
+		/* Already did it once. */
+		return;
+	}
+	tried = 1;
+
+	if (rootdev == NODEV)
+		return;
+	for (cmaj = 0; cmaj < nchrdev; cmaj++) {
+		rrootdev = makedev(cmaj, minor(rootdev));
+		if (chrtoblk(rrootdev) == rootdev)
+			return;
+	}
+	rrootdev = NODEV;
+	printf("kernfs_get_rrootdev: no raw root device\n");
+}
+
+/*
+ * Mount the Kernel params filesystem
+ */
+kernfs_mount(mp, path, data, ndp, p)
+	struct mount *mp;
+	char *path;
+	caddr_t data;
+	struct nameidata *ndp;
+	struct proc *p;
+{
+	int error = 0;
+	size_t size;
+	struct kernfs_mount *fmp;
+	struct vnode *rvp;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_mount(mp = %x)\n", mp);
+#endif
+
+	/*
+	 * Update is a no-op
+	 */
+	if (mp->mnt_flag & MNT_UPDATE)
+		return (EOPNOTSUPP);
+
+	if (error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp))
+		return (error);
+
+	MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
+	    M_MISCFSMNT, M_WAITOK);
+	rvp->v_type = VDIR;
+	rvp->v_flag |= VROOT;
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_mount: root vp = %x\n", rvp);
+#endif
+	fmp->kf_root = rvp;
+	mp->mnt_flag |= MNT_LOCAL;
+	mp->mnt_data = (qaddr_t)fmp;
+	getnewfsid(mp, makefstype(MOUNT_KERNFS));
+
+	(void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
+	bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
+	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
+	bcopy("kernfs", mp->mnt_stat.f_mntfromname, sizeof("kernfs"));
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_mount: at %s\n", mp->mnt_stat.f_mntonname);
+#endif
+
+	kernfs_get_rrootdev();
+	return (0);
+}
+
+kernfs_start(mp, flags, p)
+	struct mount *mp;
+	int flags;
+	struct proc *p;
+{
+
+	return (0);
+}
+
+kernfs_unmount(mp, mntflags, p)
+	struct mount *mp;
+	int mntflags;
+	struct proc *p;
+{
+	int error;
+	int flags = 0;
+	extern int doforce;
+	struct vnode *rootvp = VFSTOKERNFS(mp)->kf_root;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_unmount(mp = %x)\n", mp);
+#endif
+
+	if (mntflags & MNT_FORCE) {
+		/* kernfs can never be rootfs so don't check for it */
+		if (!doforce)
+			return (EINVAL);
+		flags |= FORCECLOSE;
+	}
+
+	/*
+	 * Clear out buffer cache.  I don't think we
+	 * ever get anything cached at this level at the
+	 * moment, but who knows...
+	 */
+	if (rootvp->v_usecount > 1)
+		return (EBUSY);
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_unmount: calling vflush\n");
+#endif
+	if (error = vflush(mp, rootvp, flags))
+		return (error);
+
+#ifdef KERNFS_DIAGNOSTIC
+	vprint("kernfs root", rootvp);
+#endif
+	/*
+	 * Clean out the old root vnode for reuse.
+	 */
+	vrele(rootvp);
+	vgone(rootvp);
+	/*
+	 * Finally, throw away the kernfs_mount structure
+	 */
+	free(mp->mnt_data, M_MISCFSMNT);
+	mp->mnt_data = 0;
+	return (0);
+}
+
+kernfs_root(mp, vpp)
+	struct mount *mp;
+	struct vnode **vpp;
+{
+	struct vnode *vp;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_root(mp = %x)\n", mp);
+#endif
+
+	/*
+	 * Return locked reference to root.
+	 */
+	vp = VFSTOKERNFS(mp)->kf_root;
+	VREF(vp);
+	VOP_LOCK(vp);
+	*vpp = vp;
+	return (0);
+}
+
+kernfs_quotactl(mp, cmd, uid, arg, p)
+	struct mount *mp;
+	int cmd;
+	uid_t uid;
+	caddr_t arg;
+	struct proc *p;
+{
+
+	return (EOPNOTSUPP);
+}
+
+kernfs_statfs(mp, sbp, p)
+	struct mount *mp;
+	struct statfs *sbp;
+	struct proc *p;
+{
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_statfs(mp = %x)\n", mp);
+#endif
+
+#ifdef COMPAT_09
+	sbp->f_type = 7;
+#else
+	sbp->f_type = 0;
+#endif
+	sbp->f_bsize = DEV_BSIZE;
+	sbp->f_iosize = DEV_BSIZE;
+	sbp->f_blocks = 2;		/* 1K to keep df happy */
+	sbp->f_bfree = 0;
+	sbp->f_bavail = 0;
+	sbp->f_files = 0;
+	sbp->f_ffree = 0;
+	if (sbp != &mp->mnt_stat) {
+		bcopy(&mp->mnt_stat.f_fsid, &sbp->f_fsid, sizeof(sbp->f_fsid));
+		bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
+		bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
+	}
+	strncpy(sbp->f_fstypename, mp->mnt_op->vfs_name, MFSNAMELEN);
+	return (0);
+}
+
+kernfs_sync(mp, waitfor)
+	struct mount *mp;
+	int waitfor;
+{
+
+	return (0);
+}
+
+/*
+ * Kernfs flat namespace lookup.
+ * Currently unsupported.
+ */
+kernfs_vget(mp, ino, vpp)
+	struct mount *mp;
+	ino_t ino;
+	struct vnode **vpp;
+{
+
+	return (EOPNOTSUPP);
+}
+
+
+kernfs_fhtovp(mp, fhp, setgen, vpp)
+	struct mount *mp;
+	struct fid *fhp;
+	int setgen;
+	struct vnode **vpp;
+{
+
+	return (EOPNOTSUPP);
+}
+
+kernfs_vptofh(vp, fhp)
+	struct vnode *vp;
+	struct fid *fhp;
+{
+
+	return (EOPNOTSUPP);
+}
+
+struct vfsops kernfs_vfsops = {
+	MOUNT_KERNFS,
+	kernfs_mount,
+	kernfs_start,
+	kernfs_unmount,
+	kernfs_root,
+	kernfs_quotactl,
+	kernfs_statfs,
+	kernfs_sync,
+	kernfs_vget,
+	kernfs_fhtovp,
+	kernfs_vptofh,
+	kernfs_init,
+};
diff --git a/sys/miscfs/kernfs/kernfs_vnops.c b/sys/miscfs/kernfs/kernfs_vnops.c
new file mode 100644
index 00000000000..e7e565bcd55
--- /dev/null
+++ b/sys/miscfs/kernfs/kernfs_vnops.c
@@ -0,0 +1,747 @@
+/*	$NetBSD: kernfs_vnops.c,v 1.39 1995/10/09 14:25:02 mycroft Exp $	*/
+
+/*
+ * Copyright (c) 1992, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * This code is derived from software donated to Berkeley by
+ * Jan-Simon Pendry.
+ *
+ * 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.
+ *
+ *	@(#)kernfs_vnops.c	8.9 (Berkeley) 6/15/94
+ */
+
+/*
+ * Kernel parameter filesystem (/kern)
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/vmmeter.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/proc.h>
+#include <sys/vnode.h>
+#include <sys/malloc.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/buf.h>
+#include <sys/dirent.h>
+#include <sys/msgbuf.h>
+#include <miscfs/kernfs/kernfs.h>
+
+#define KSTRING	256		/* Largest I/O available via this filesystem */
+#define	UIO_MX 32
+
+#define	READ_MODE	(S_IRUSR|S_IRGRP|S_IROTH)
+#define	WRITE_MODE	(S_IWUSR|S_IRUSR|S_IRGRP|S_IROTH)
+#define DIR_MODE	(S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH)
+
+struct kern_target {
+	u_char kt_type;
+	u_char kt_namlen;
+	char *kt_name;
+	void *kt_data;
+#define	KTT_NULL	 1
+#define	KTT_TIME	 5
+#define KTT_INT		17
+#define	KTT_STRING	31
+#define KTT_HOSTNAME	47
+#define KTT_AVENRUN	53
+#define KTT_DEVICE	71
+#define	KTT_MSGBUF	89
+	u_char kt_tag;
+	u_char kt_vtype;
+	mode_t kt_mode;
+} kern_targets[] = {
+/* NOTE: The name must be less than UIO_MX-16 chars in length */
+#define N(s) sizeof(s)-1, s
+     /*        name            data          tag           type  ro/rw */
+     { DT_DIR, N("."),         0,            KTT_NULL,     VDIR, DIR_MODE   },
+     { DT_DIR, N(".."),        0,            KTT_NULL,     VDIR, DIR_MODE   },
+     { DT_REG, N("boottime"),  &boottime.tv_sec, KTT_INT,  VREG, READ_MODE  },
+     { DT_REG, N("copyright"), copyright,    KTT_STRING,   VREG, READ_MODE  },
+     { DT_REG, N("hostname"),  0,            KTT_HOSTNAME, VREG, WRITE_MODE },
+     { DT_REG, N("hz"),        &hz,          KTT_INT,      VREG, READ_MODE  },
+     { DT_REG, N("loadavg"),   0,            KTT_AVENRUN,  VREG, READ_MODE  },
+     { DT_REG, N("msgbuf"),    0,	     KTT_MSGBUF,   VREG, READ_MODE  },
+     { DT_REG, N("pagesize"),  &cnt.v_page_size, KTT_INT,  VREG, READ_MODE  },
+     { DT_REG, N("physmem"),   &physmem,     KTT_INT,      VREG, READ_MODE  },
+#if 0
+     { DT_DIR, N("root"),      0,            KTT_NULL,     VDIR, DIR_MODE   },
+#endif
+     { DT_BLK, N("rootdev"),   &rootdev,     KTT_DEVICE,   VBLK, READ_MODE  },
+     { DT_CHR, N("rrootdev"),  &rrootdev,    KTT_DEVICE,   VCHR, READ_MODE  },
+     { DT_REG, N("time"),      0,            KTT_TIME,     VREG, READ_MODE  },
+     { DT_REG, N("version"),   version,      KTT_STRING,   VREG, READ_MODE  },
+#undef N
+};
+static int nkern_targets = sizeof(kern_targets) / sizeof(kern_targets[0]);
+
+int
+kernfs_xread(kt, off, bufp, len)
+	struct kern_target *kt;
+	int off;
+	char **bufp;
+	int len;
+{
+
+	switch (kt->kt_tag) {
+	case KTT_TIME: {
+		struct timeval tv;
+
+		microtime(&tv);
+		sprintf(*bufp, "%d %d\n", tv.tv_sec, tv.tv_usec);
+		break;
+	}
+
+	case KTT_INT: {
+		int *ip = kt->kt_data;
+
+		sprintf(*bufp, "%d\n", *ip);
+		break;
+	}
+
+	case KTT_STRING: {
+		char *cp = kt->kt_data;
+
+		*bufp = cp;
+		break;
+	}
+
+	case KTT_MSGBUF: {
+		extern struct msgbuf *msgbufp;
+		long n;
+
+		if (off >= MSG_BSIZE)
+			return (0);
+		n = msgbufp->msg_bufx + off;
+		if (n >= MSG_BSIZE)
+			n -= MSG_BSIZE;
+		len = min(MSG_BSIZE - n, MSG_BSIZE - off);
+		*bufp = msgbufp->msg_bufc + n;
+		return (len);
+	}
+
+	case KTT_HOSTNAME: {
+		char *cp = hostname;
+		int xlen = hostnamelen;
+
+		if (xlen >= (len-2))
+			return (EINVAL);
+
+		bcopy(cp, *bufp, xlen);
+		(*bufp)[xlen] = '\n';
+		(*bufp)[xlen+1] = '\0';
+		break;
+	}
+
+	case KTT_AVENRUN:
+		averunnable.fscale = FSCALE;
+		sprintf(*bufp, "%ld %ld %ld %ld\n",
+		    averunnable.ldavg[0], averunnable.ldavg[1],
+		    averunnable.ldavg[2], averunnable.fscale);
+		break;
+
+	default:
+		return (0);
+	}
+
+	len = strlen(*bufp);
+	if (len <= off)
+		return (0);
+	*bufp += off;
+	return (len - off);
+}
+
+int
+kernfs_xwrite(kt, buf, len)
+	struct kern_target *kt;
+	char *buf;
+	int len;
+{
+
+	switch (kt->kt_tag) {
+	case KTT_HOSTNAME:
+		if (buf[len-1] == '\n')
+			--len;
+		bcopy(buf, hostname, len);
+		hostname[len] = '\0';
+		hostnamelen = len;
+		return (0);
+
+	default:
+		return (EIO);
+	}
+}
+
+
+/*
+ * vp is the current namei directory
+ * ndp is the name to locate in that directory...
+ */
+kernfs_lookup(ap)
+	struct vop_lookup_args /* {
+		struct vnode * a_dvp;
+		struct vnode ** a_vpp;
+		struct componentname * a_cnp;
+	} */ *ap;
+{
+	struct componentname *cnp = ap->a_cnp;
+	struct vnode **vpp = ap->a_vpp;
+	struct vnode *dvp = ap->a_dvp;
+	char *pname = cnp->cn_nameptr;
+	struct kern_target *kt;
+	struct vnode *fvp;
+	int error, i;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_lookup(%x)\n", ap);
+	printf("kernfs_lookup(dp = %x, vpp = %x, cnp = %x)\n", dvp, vpp, ap->a_cnp);
+	printf("kernfs_lookup(%s)\n", pname);
+#endif
+
+	*vpp = NULLVP;
+
+	if (cnp->cn_nameiop == DELETE || cnp->cn_nameiop == RENAME)
+		return (EROFS);
+
+	if (cnp->cn_namelen == 1 && *pname == '.') {
+		*vpp = dvp;
+		VREF(dvp);
+		/*VOP_LOCK(dvp);*/
+		return (0);
+	}
+
+#if 0
+	if (cnp->cn_namelen == 4 && bcmp(pname, "root", 4) == 0) {
+		*vpp = rootdir;
+		VREF(rootdir);
+		VOP_LOCK(rootdir);
+		return (0);
+	}
+#endif
+
+	for (kt = kern_targets, i = 0; i < nkern_targets; kt++, i++) {
+		if (cnp->cn_namelen == kt->kt_namlen &&
+		    bcmp(kt->kt_name, pname, cnp->cn_namelen) == 0)
+			goto found;
+	}
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_lookup: i = %d, failed", i);
+#endif
+
+	return (cnp->cn_nameiop == LOOKUP ? ENOENT : EROFS);
+
+found:
+	if (kt->kt_tag == KTT_DEVICE) {
+		dev_t *dp = kt->kt_data;
+	loop:
+		if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp))
+			return (ENOENT);
+		*vpp = fvp;
+		if (vget(fvp, 1))
+			goto loop;
+		return (0);
+	}
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_lookup: allocate new vnode\n");
+#endif
+	if (error = getnewvnode(VT_KERNFS, dvp->v_mount, kernfs_vnodeop_p,
+	    &fvp))
+		return (error);
+
+	MALLOC(fvp->v_data, void *, sizeof(struct kernfs_node), M_TEMP,
+	    M_WAITOK);
+	VTOKERN(fvp)->kf_kt = kt;
+	fvp->v_type = kt->kt_vtype;
+	*vpp = fvp;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_lookup: newvp = %x\n", fvp);
+#endif
+	return (0);
+}
+
+kernfs_open(ap)
+	struct vop_open_args /* {
+		struct vnode *a_vp;
+		int  a_mode;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+
+	/* Only need to check access permissions. */
+	return (0);
+}
+
+int
+kernfs_access(ap)
+	struct vop_access_args /* {
+		struct vnode *a_vp;
+		int a_mode;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	mode_t fmode =
+	    (vp->v_flag & VROOT) ? DIR_MODE : VTOKERN(vp)->kf_kt->kt_mode;
+
+	return (vaccess(fmode, (uid_t)0, (gid_t)0, ap->a_mode, ap->a_cred));
+}
+
+kernfs_getattr(ap)
+	struct vop_getattr_args /* {
+		struct vnode *a_vp;
+		struct vattr *a_vap;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	struct vattr *vap = ap->a_vap;
+	struct timeval tv;
+	int error = 0;
+	char strbuf[KSTRING], *buf;
+
+	bzero((caddr_t) vap, sizeof(*vap));
+	vattr_null(vap);
+	vap->va_uid = 0;
+	vap->va_gid = 0;
+	vap->va_fsid = vp->v_mount->mnt_stat.f_fsid.val[0];
+	vap->va_size = 0;
+	vap->va_blocksize = DEV_BSIZE;
+	microtime(&tv);
+	TIMEVAL_TO_TIMESPEC(&tv, &vap->va_atime);
+	vap->va_mtime = vap->va_atime;
+	vap->va_ctime = vap->va_ctime;
+	vap->va_gen = 0;
+	vap->va_flags = 0;
+	vap->va_rdev = 0;
+	vap->va_bytes = 0;
+
+	if (vp->v_flag & VROOT) {
+#ifdef KERNFS_DIAGNOSTIC
+		printf("kernfs_getattr: stat rootdir\n");
+#endif
+		vap->va_type = VDIR;
+		vap->va_mode = DIR_MODE;
+		vap->va_nlink = 2;
+		vap->va_fileid = 2;
+		vap->va_size = DEV_BSIZE;
+	} else {
+		struct kern_target *kt = VTOKERN(vp)->kf_kt;
+		int nbytes, total;
+#ifdef KERNFS_DIAGNOSTIC
+		printf("kernfs_getattr: stat target %s\n", kt->kt_name);
+#endif
+		vap->va_type = kt->kt_vtype;
+		vap->va_mode = kt->kt_mode;
+		vap->va_nlink = 1;
+		vap->va_fileid = 3 + (kt - kern_targets);
+		total = 0;
+		while (buf = strbuf,
+		       nbytes = kernfs_xread(kt, total, &buf, sizeof(strbuf)))
+			total += nbytes;
+		vap->va_size = total;
+	}
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_getattr: return error %d\n", error);
+#endif
+	return (error);
+}
+
+kernfs_setattr(ap)
+	struct vop_setattr_args /* {
+		struct vnode *a_vp;
+		struct vattr *a_vap;
+		struct ucred *a_cred;
+		struct proc *a_p;
+	} */ *ap;
+{
+
+	/*
+	 * Silently ignore attribute changes.
+	 * This allows for open with truncate to have no
+	 * effect until some data is written.  I want to
+	 * do it this way because all writes are atomic.
+	 */
+	return (0);
+}
+
+int
+kernfs_read(ap)
+	struct vop_read_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int  a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	struct uio *uio = ap->a_uio;
+	struct kern_target *kt;
+	char strbuf[KSTRING], *buf;
+	int off, len;
+	int error;
+
+	if (vp->v_type == VDIR)
+		return (EOPNOTSUPP);
+
+	kt = VTOKERN(vp)->kf_kt;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kern_read %s\n", kt->kt_name);
+#endif
+
+	off = uio->uio_offset;
+#if 0
+	while (buf = strbuf,
+#else
+	if (buf = strbuf,
+#endif
+	    len = kernfs_xread(kt, off, &buf, sizeof(strbuf))) {
+		if (error = uiomove(buf, len, uio))
+			return (error);
+		off += len;
+	}
+	return (0);
+}
+
+int
+kernfs_write(ap)
+	struct vop_write_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		int  a_ioflag;
+		struct ucred *a_cred;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+	struct uio *uio = ap->a_uio;
+	struct kern_target *kt;
+	int error, xlen;
+	char strbuf[KSTRING];
+
+	if (vp->v_type == VDIR)
+		return (EOPNOTSUPP);
+
+	kt = VTOKERN(vp)->kf_kt;
+
+	if (uio->uio_offset != 0)
+		return (EINVAL);
+
+	xlen = min(uio->uio_resid, KSTRING-1);
+	if (error = uiomove(strbuf, xlen, uio))
+		return (error);
+
+	if (uio->uio_resid != 0)
+		return (EIO);
+
+	strbuf[xlen] = '\0';
+	xlen = strlen(strbuf);
+	return (kernfs_xwrite(kt, strbuf, xlen));
+}
+
+kernfs_readdir(ap)
+	struct vop_readdir_args /* {
+		struct vnode *a_vp;
+		struct uio *a_uio;
+		struct ucred *a_cred;
+		int *a_eofflag;
+		u_long *a_cookies;
+		int a_ncookies;
+	} */ *ap;
+{
+	struct uio *uio = ap->a_uio;
+	struct dirent d;
+	struct kern_target *kt;
+	int i;
+	int error;
+	u_long *cookies = ap->a_cookies;
+	int ncookies = ap->a_ncookies;
+
+	if (ap->a_vp->v_type != VDIR)
+		return (ENOTDIR);
+
+	if (uio->uio_resid < UIO_MX)
+		return (EINVAL);
+	if (uio->uio_offset < 0)
+		return (EINVAL);
+
+	error = 0;
+	i = uio->uio_offset;
+	bzero((caddr_t)&d, UIO_MX);
+	d.d_reclen = UIO_MX;
+
+	for (kt = &kern_targets[i];
+	     uio->uio_resid >= UIO_MX && i < nkern_targets; kt++, i++) {
+#ifdef KERNFS_DIAGNOSTIC
+		printf("kernfs_readdir: i = %d\n", i);
+#endif
+
+		if (kt->kt_tag == KTT_DEVICE) {
+			dev_t *dp = kt->kt_data;
+			struct vnode *fvp;
+
+			if (*dp == NODEV || !vfinddev(*dp, kt->kt_vtype, &fvp))
+				continue;
+		}
+
+		d.d_fileno = i + 3;
+		d.d_namlen = kt->kt_namlen;
+		bcopy(kt->kt_name, d.d_name, kt->kt_namlen + 1);
+		d.d_type = kt->kt_type;
+
+		if (error = uiomove((caddr_t)&d, UIO_MX, uio))
+			break;
+		if (ncookies-- > 0)
+			*cookies++ = i + 1;
+	}
+
+	uio->uio_offset = i;
+	return (error);
+}
+
+kernfs_inactive(ap)
+	struct vop_inactive_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_inactive(%x)\n", vp);
+#endif
+	/*
+	 * Clear out the v_type field to avoid
+	 * nasty things happening in vgone().
+	 */
+	vp->v_type = VNON;
+	return (0);
+}
+
+kernfs_reclaim(ap)
+	struct vop_reclaim_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+	struct vnode *vp = ap->a_vp;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_reclaim(%x)\n", vp);
+#endif
+	if (vp->v_data) {
+		FREE(vp->v_data, M_TEMP);
+		vp->v_data = 0;
+	}
+	return (0);
+}
+
+/*
+ * Return POSIX pathconf information applicable to special devices.
+ */
+kernfs_pathconf(ap)
+	struct vop_pathconf_args /* {
+		struct vnode *a_vp;
+		int a_name;
+		register_t *a_retval;
+	} */ *ap;
+{
+
+	switch (ap->a_name) {
+	case _PC_LINK_MAX:
+		*ap->a_retval = LINK_MAX;
+		return (0);
+	case _PC_MAX_CANON:
+		*ap->a_retval = MAX_CANON;
+		return (0);
+	case _PC_MAX_INPUT:
+		*ap->a_retval = MAX_INPUT;
+		return (0);
+	case _PC_PIPE_BUF:
+		*ap->a_retval = PIPE_BUF;
+		return (0);
+	case _PC_CHOWN_RESTRICTED:
+		*ap->a_retval = 1;
+		return (0);
+	case _PC_VDISABLE:
+		*ap->a_retval = _POSIX_VDISABLE;
+		return (0);
+	default:
+		return (EINVAL);
+	}
+	/* NOTREACHED */
+}
+
+/*
+ * Print out the contents of a /dev/fd vnode.
+ */
+/* ARGSUSED */
+kernfs_print(ap)
+	struct vop_print_args /* {
+		struct vnode *a_vp;
+	} */ *ap;
+{
+
+	printf("tag VT_KERNFS, kernfs vnode\n");
+	return (0);
+}
+
+/*void*/
+kernfs_vfree(ap)
+	struct vop_vfree_args /* {
+		struct vnode *a_pvp;
+		ino_t a_ino;
+		int a_mode;
+	} */ *ap;
+{
+
+	return (0);
+}
+
+/*
+ * /dev/fd vnode unsupported operation
+ */
+kernfs_enotsupp()
+{
+
+	return (EOPNOTSUPP);
+}
+
+/*
+ * /dev/fd "should never get here" operation
+ */
+kernfs_badop()
+{
+
+	panic("kernfs: bad op");
+	/* NOTREACHED */
+}
+
+/*
+ * kernfs vnode null operation
+ */
+kernfs_nullop()
+{
+
+	return (0);
+}
+
+#define kernfs_create ((int (*) __P((struct  vop_create_args *)))kernfs_enotsupp)
+#define kernfs_mknod ((int (*) __P((struct  vop_mknod_args *)))kernfs_enotsupp)
+#define kernfs_close ((int (*) __P((struct  vop_close_args *)))nullop)
+#define kernfs_ioctl ((int (*) __P((struct  vop_ioctl_args *)))kernfs_enotsupp)
+#define kernfs_select ((int (*) __P((struct  vop_select_args *)))kernfs_enotsupp)
+#define kernfs_mmap ((int (*) __P((struct  vop_mmap_args *)))kernfs_enotsupp)
+#define kernfs_fsync ((int (*) __P((struct  vop_fsync_args *)))nullop)
+#define kernfs_seek ((int (*) __P((struct  vop_seek_args *)))nullop)
+#define kernfs_remove ((int (*) __P((struct  vop_remove_args *)))kernfs_enotsupp)
+#define kernfs_link ((int (*) __P((struct  vop_link_args *)))kernfs_enotsupp)
+#define kernfs_rename ((int (*) __P((struct  vop_rename_args *)))kernfs_enotsupp)
+#define kernfs_mkdir ((int (*) __P((struct  vop_mkdir_args *)))kernfs_enotsupp)
+#define kernfs_rmdir ((int (*) __P((struct  vop_rmdir_args *)))kernfs_enotsupp)
+#define kernfs_symlink ((int (*) __P((struct vop_symlink_args *)))kernfs_enotsupp)
+#define kernfs_readlink \
+	((int (*) __P((struct  vop_readlink_args *)))kernfs_enotsupp)
+#define kernfs_abortop ((int (*) __P((struct  vop_abortop_args *)))nullop)
+#define kernfs_lock ((int (*) __P((struct  vop_lock_args *)))nullop)
+#define kernfs_unlock ((int (*) __P((struct  vop_unlock_args *)))nullop)
+#define kernfs_bmap ((int (*) __P((struct  vop_bmap_args *)))kernfs_badop)
+#define kernfs_strategy ((int (*) __P((struct  vop_strategy_args *)))kernfs_badop)
+#define kernfs_islocked ((int (*) __P((struct  vop_islocked_args *)))nullop)
+#define kernfs_advlock ((int (*) __P((struct vop_advlock_args *)))kernfs_enotsupp)
+#define kernfs_blkatoff \
+	((int (*) __P((struct  vop_blkatoff_args *)))kernfs_enotsupp)
+#define kernfs_valloc ((int(*) __P(( \
+		struct vnode *pvp, \
+		int mode, \
+		struct ucred *cred, \
+		struct vnode **vpp))) kernfs_enotsupp)
+#define kernfs_truncate \
+	((int (*) __P((struct  vop_truncate_args *)))kernfs_enotsupp)
+#define kernfs_update ((int (*) __P((struct  vop_update_args *)))kernfs_enotsupp)
+#define kernfs_bwrite ((int (*) __P((struct  vop_bwrite_args *)))kernfs_enotsupp)
+
+int (**kernfs_vnodeop_p)();
+struct vnodeopv_entry_desc kernfs_vnodeop_entries[] = {
+	{ &vop_default_desc, vn_default_error },
+	{ &vop_lookup_desc, kernfs_lookup },	/* lookup */
+	{ &vop_create_desc, kernfs_create },	/* create */
+	{ &vop_mknod_desc, kernfs_mknod },	/* mknod */
+	{ &vop_open_desc, kernfs_open },	/* open */
+	{ &vop_close_desc, kernfs_close },	/* close */
+	{ &vop_access_desc, kernfs_access },	/* access */
+	{ &vop_getattr_desc, kernfs_getattr },	/* getattr */
+	{ &vop_setattr_desc, kernfs_setattr },	/* setattr */
+	{ &vop_read_desc, kernfs_read },	/* read */
+	{ &vop_write_desc, kernfs_write },	/* write */
+	{ &vop_ioctl_desc, kernfs_ioctl },	/* ioctl */
+	{ &vop_select_desc, kernfs_select },	/* select */
+	{ &vop_mmap_desc, kernfs_mmap },	/* mmap */
+	{ &vop_fsync_desc, kernfs_fsync },	/* fsync */
+	{ &vop_seek_desc, kernfs_seek },	/* seek */
+	{ &vop_remove_desc, kernfs_remove },	/* remove */
+	{ &vop_link_desc, kernfs_link },	/* link */
+	{ &vop_rename_desc, kernfs_rename },	/* rename */
+	{ &vop_mkdir_desc, kernfs_mkdir },	/* mkdir */
+	{ &vop_rmdir_desc, kernfs_rmdir },	/* rmdir */
+	{ &vop_symlink_desc, kernfs_symlink },	/* symlink */
+	{ &vop_readdir_desc, kernfs_readdir },	/* readdir */
+	{ &vop_readlink_desc, kernfs_readlink },/* readlink */
+	{ &vop_abortop_desc, kernfs_abortop },	/* abortop */
+	{ &vop_inactive_desc, kernfs_inactive },/* inactive */
+	{ &vop_reclaim_desc, kernfs_reclaim },	/* reclaim */
+	{ &vop_lock_desc, kernfs_lock },	/* lock */
+	{ &vop_unlock_desc, kernfs_unlock },	/* unlock */
+	{ &vop_bmap_desc, kernfs_bmap },	/* bmap */
+	{ &vop_strategy_desc, kernfs_strategy },/* strategy */
+	{ &vop_print_desc, kernfs_print },	/* print */
+	{ &vop_islocked_desc, kernfs_islocked },/* islocked */
+	{ &vop_pathconf_desc, kernfs_pathconf },/* pathconf */
+	{ &vop_advlock_desc, kernfs_advlock },	/* advlock */
+	{ &vop_blkatoff_desc, kernfs_blkatoff },/* blkatoff */
+	{ &vop_valloc_desc, kernfs_valloc },	/* valloc */
+	{ &vop_vfree_desc, kernfs_vfree },	/* vfree */
+	{ &vop_truncate_desc, kernfs_truncate },/* truncate */
+	{ &vop_update_desc, kernfs_update },	/* update */
+	{ &vop_bwrite_desc, kernfs_bwrite },	/* bwrite */
+	{ (struct vnodeop_desc*)NULL, (int(*)())NULL }
+};
+struct vnodeopv_desc kernfs_vnodeop_opv_desc =
+	{ &kernfs_vnodeop_p, kernfs_vnodeop_entries };