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diff --git a/sys/fs/fdescfs/fdesc_vfsops.c b/sys/fs/fdescfs/fdesc_vfsops.c
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+/*
+ * 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.
+ *
+ * @(#)fdesc_vfsops.c 8.4 (Berkeley) 1/21/94
+ *
+ * $Id: fdesc_vfsops.c,v 1.9 1993/04/06 15:28:33 jsp Exp $
+ */
+
+/*
+ * /dev/fd Filesystem
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/proc.h>
+#include <sys/resourcevar.h>
+#include <sys/filedesc.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/namei.h>
+#include <sys/malloc.h>
+#include <miscfs/fdesc/fdesc.h>
+
+/*
+ * Mount the per-process file descriptors (/dev/fd)
+ */
+int
+fdesc_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 fdescmount *fmp;
+ struct vnode *rvp;
+
+ /*
+ * Update is a no-op
+ */
+ if (mp->mnt_flag & MNT_UPDATE)
+ return (EOPNOTSUPP);
+
+ error = fdesc_allocvp(Froot, FD_ROOT, mp, &rvp);
+ if (error)
+ return (error);
+
+ MALLOC(fmp, struct fdescmount *, sizeof(struct fdescmount),
+ M_UFSMNT, M_WAITOK); /* XXX */
+ rvp->v_type = VDIR;
+ rvp->v_flag |= VROOT;
+ fmp->f_root = rvp;
+ /* XXX -- don't mark as local to work around fts() problems */
+ /*mp->mnt_flag |= MNT_LOCAL;*/
+ mp->mnt_data = (qaddr_t) fmp;
+ getnewfsid(mp, MOUNT_FDESC);
+
+ (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("fdesc", mp->mnt_stat.f_mntfromname, sizeof("fdesc"));
+ return (0);
+}
+
+int
+fdesc_start(mp, flags, p)
+ struct mount *mp;
+ int flags;
+ struct proc *p;
+{
+ return (0);
+}
+
+int
+fdesc_unmount(mp, mntflags, p)
+ struct mount *mp;
+ int mntflags;
+ struct proc *p;
+{
+ int error;
+ int flags = 0;
+ extern int doforce;
+ struct vnode *rootvp = VFSTOFDESC(mp)->f_root;
+
+ if (mntflags & MNT_FORCE) {
+ /* fdesc 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);
+ if (error = vflush(mp, rootvp, flags))
+ return (error);
+
+ /*
+ * Release reference on underlying root vnode
+ */
+ vrele(rootvp);
+ /*
+ * And blow it away for future re-use
+ */
+ vgone(rootvp);
+ /*
+ * Finally, throw away the fdescmount structure
+ */
+ free(mp->mnt_data, M_UFSMNT); /* XXX */
+ mp->mnt_data = 0;
+
+ return (0);
+}
+
+int
+fdesc_root(mp, vpp)
+ struct mount *mp;
+ struct vnode **vpp;
+{
+ struct vnode *vp;
+
+ /*
+ * Return locked reference to root.
+ */
+ vp = VFSTOFDESC(mp)->f_root;
+ VREF(vp);
+ VOP_LOCK(vp);
+ *vpp = vp;
+ return (0);
+}
+
+int
+fdesc_quotactl(mp, cmd, uid, arg, p)
+ struct mount *mp;
+ int cmd;
+ uid_t uid;
+ caddr_t arg;
+ struct proc *p;
+{
+
+ return (EOPNOTSUPP);
+}
+
+int
+fdesc_statfs(mp, sbp, p)
+ struct mount *mp;
+ struct statfs *sbp;
+ struct proc *p;
+{
+ struct filedesc *fdp;
+ int lim;
+ int i;
+ int last;
+ int freefd;
+
+ /*
+ * Compute number of free file descriptors.
+ * [ Strange results will ensue if the open file
+ * limit is ever reduced below the current number
+ * of open files... ]
+ */
+ lim = p->p_rlimit[RLIMIT_NOFILE].rlim_cur;
+ fdp = p->p_fd;
+ last = min(fdp->fd_nfiles, lim);
+ freefd = 0;
+ for (i = fdp->fd_freefile; i < last; i++)
+ if (fdp->fd_ofiles[i] == NULL)
+ freefd++;
+
+ /*
+ * Adjust for the fact that the fdesc array may not
+ * have been fully allocated yet.
+ */
+ if (fdp->fd_nfiles < lim)
+ freefd += (lim - fdp->fd_nfiles);
+
+ sbp->f_type = MOUNT_FDESC;
+ 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 = lim + 1; /* Allow for "." */
+ sbp->f_ffree = freefd; /* See comments above */
+ 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);
+}
+
+int
+fdesc_sync(mp, waitfor)
+ struct mount *mp;
+ int waitfor;
+{
+
+ return (0);
+}
+
+/*
+ * Fdesc flat namespace lookup.
+ * Currently unsupported.
+ */
+int
+fdesc_vget(mp, ino, vpp)
+ struct mount *mp;
+ ino_t ino;
+ struct vnode **vpp;
+{
+
+ return (EOPNOTSUPP);
+}
+
+int
+fdesc_fhtovp(mp, fhp, setgen, vpp)
+ struct mount *mp;
+ struct fid *fhp;
+ int setgen;
+ struct vnode **vpp;
+{
+ return (EOPNOTSUPP);
+}
+
+int
+fdesc_vptofh(vp, fhp)
+ struct vnode *vp;
+ struct fid *fhp;
+{
+
+ return (EOPNOTSUPP);
+}
+
+struct vfsops fdesc_vfsops = {
+ fdesc_mount,
+ fdesc_start,
+ fdesc_unmount,
+ fdesc_root,
+ fdesc_quotactl,
+ fdesc_statfs,
+ fdesc_sync,
+ fdesc_vget,
+ fdesc_fhtovp,
+ fdesc_vptofh,
+ fdesc_init,
+};
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