1 files changed, 329 insertions, 0 deletions
diff --git a/sys/miscfs/kernfs/kernfs_vfsops.c b/sys/miscfs/kernfs/kernfs_vfsops.c
new file mode 100644
index 0000000..b68d76e
--- /dev/null
+++ b/sys/miscfs/kernfs/kernfs_vfsops.c
@@ -0,0 +1,329 @@
+/*
+ * 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	8.4 (Berkeley) 1/21/94
+ */
+
+/*
+ * 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>
+
+struct vnode *rrootvp;
+
+/*
+ * Create a vnode for a character device.
+ */
+int
+cdevvp(dev, vpp)
+	dev_t dev;
+	struct vnode **vpp;
+{
+	register struct vnode *vp;
+	struct vnode *nvp;
+	int error;
+
+	if (dev == NODEV)
+		return (0);
+	error = getnewvnode(VT_NON, (struct mount *)0, spec_vnodeop_p, &nvp);
+	if (error) {
+		*vpp = 0;
+		return (error);
+	}
+	vp = nvp;
+	vp->v_type = VCHR;
+	if (nvp = checkalias(vp, dev, (struct mount *)0)) {
+		vput(vp);
+		vp = nvp;
+	}
+	*vpp = vp;
+	return (0);
+}
+
+kernfs_init()
+{
+	int cmaj;
+	int bmaj = major(rootdev);
+	int error = ENXIO;
+
+#ifdef KERNFS_DIAGNOSTIC
+	printf("kernfs_init\n");		/* printed during system boot */
+#endif
+
+	for (cmaj = 0; cmaj < nchrdev; cmaj++) {
+		if (cdevsw[cmaj].d_open == bdevsw[bmaj].d_open) {
+			dev_t cdev = makedev(cmaj, minor(rootdev));
+			error = cdevvp(cdev, &rrootvp);
+			if (error == 0)
+				break;
+		}
+	}
+
+	if (error) {
+		printf("kernfs: no raw boot device\n");
+		rrootvp = 0;
+	}
+}
+
+/*
+ * 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;
+	u_int 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);
+
+	error = getnewvnode(VT_KERNFS, mp, kernfs_vnodeop_p, &rvp);	/* XXX */
+	if (error)
+		return (error);
+
+	MALLOC(fmp, struct kernfs_mount *, sizeof(struct kernfs_mount),
+				M_UFSMNT, M_WAITOK);	/* XXX */
+	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, 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
+	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
+	/*
+	 * Release reference on underlying root vnode
+	 */
+	vrele(rootvp);
+	/*
+	 * And blow it away for future re-use
+	 */
+	vgone(rootvp);
+	/*
+	 * Finally, throw away the kernfs_mount structure
+	 */
+	free(mp->mnt_data, M_UFSMNT);	/* XXX */
+	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
+
+	sbp->f_type = MOUNT_KERNFS;
+	sbp->f_flags = 0;
+	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);
+	}
+	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 = {
+	kernfs_mount,
+	kernfs_start,
+	kernfs_unmount,
+	kernfs_root,
+	kernfs_quotactl,
+	kernfs_statfs,
+	kernfs_sync,
+	kernfs_vget,
+	kernfs_fhtovp,
+	kernfs_vptofh,
+	kernfs_init,
+};