A set of regressions to test diff(1).

Currently standard, context and unified diffs are tested by diffing
two files and then applying the patch on a copy of the first file
using patch(1).  Next, the result is compared with the original
first file using cmp(1).

ok millert@ tedu@

1 files changed, 3225 insertions, 0 deletions

diff --git a/regress/usr.bin/diff/t9.2 b/regress/usr.bin/diff/t9.2
new file mode 100644
index 00000000000..caec40937dd
--- /dev/null
+++ b/regress/usr.bin/diff/t9.2
@@ -0,0 +1,3225 @@
+/*	$OpenBSD: t9.2,v 1.1 2003/07/17 21:04:04 otto Exp $	*/
+/*	$NetBSD: vfs_syscalls.c,v 1.71 1996/04/23 10:29:02 mycroft Exp $	*/
+
+/*
+ * Copyright (c) 1989, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ * (c) UNIX System Laboratories, Inc.
+ * All or some portions of this file are derived from material licensed
+ * to the University of California by American Telephone and Telegraph
+ * Co. or Unix System Laboratories, Inc. and are reproduced herein with
+ * the permission of UNIX System Laboratories, Inc.
+ *
+ * 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. 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.
+ *
+ *	@(#)vfs_syscalls.c	8.28 (Berkeley) 12/10/94
+ */
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/namei.h>
+#include <sys/filedesc.h>
+#include <sys/kernel.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <sys/vnode.h>
+#include <sys/mount.h>
+#include <sys/proc.h>
+#include <sys/uio.h>
+#include <sys/malloc.h>
+#include <sys/dirent.h>
+#include <sys/extattr.h>
+
+#include <sys/syscallargs.h>
+
+#include <uvm/uvm_extern.h>
+#include <sys/sysctl.h>
+
+extern int suid_clear;
+int	usermount = 0;		/* sysctl: by default, users may not mount */
+
+static int change_dir(struct nameidata *, struct proc *);
+
+void checkdirs(struct vnode *);
+
+/*
+ * Redirection info so we don't have to include the union fs routines in
+ * the kernel directly.  This way, we can build unionfs as an LKM.  The
+ * pointer gets filled in later, when we modload the LKM, or when the
+ * compiled-in unionfs code gets initialized.  For now, we just set
+ * it to a stub routine.
+ */
+
+int (*union_check_p)(struct proc *, struct vnode **,
+    struct file *, struct uio, int *) = NULL;
+
+/*
+ * Virtual File System System Calls
+ */
+
+/*
+ * Mount a file system.
+ */
+/* ARGSUSED */
+int
+sys_mount(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_mount_args /* {
+		syscallarg(char *) type;
+		syscallarg(char *) path;
+		syscallarg(int) flags;
+		syscallarg(void *) data;
+	} */ *uap = v;
+	register struct vnode *vp;
+	register struct mount *mp;
+	int error, flag = 0;
+#ifdef COMPAT_43
+	u_long fstypenum = 0;
+#endif
+	char fstypename[MFSNAMELEN];
+	char fspath[MNAMELEN];
+	struct vattr va;
+	struct nameidata nd;
+	struct vfsconf *vfsp;
+	struct timeval tv;
+
+	if (usermount == 0 && (error = suser(p->p_ucred, &p->p_acflag)))
+		return (error);
+
+	/*
+	 * Mount points must fit in MNAMELEN, not MAXPATHLEN.
+	 */
+	error = copyinstr(SCARG(uap, path), fspath, MNAMELEN, NULL);
+	if (error)
+		return(error);
+
+	/*
+	 * Get vnode to be covered
+	 */
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspath, p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	if (SCARG(uap, flags) & MNT_UPDATE) {
+		if ((vp->v_flag & VROOT) == 0) {
+			vput(vp);
+			return (EINVAL);
+		}
+		mp = vp->v_mount;
+		flag = mp->mnt_flag;
+		/*
+		 * We only allow the filesystem to be reloaded if it
+		 * is currently mounted read-only.
+		 */
+		if ((SCARG(uap, flags) & MNT_RELOAD) &&
+		    ((mp->mnt_flag & MNT_RDONLY) == 0)) {
+			vput(vp);
+			return (EOPNOTSUPP);	/* Needs translation */
+		}
+		mp->mnt_flag |=
+		    SCARG(uap, flags) & (MNT_RELOAD | MNT_UPDATE);
+		/*
+		 * Only root, or the user that did the original mount is
+		 * permitted to update it.
+		 */
+		if (mp->mnt_stat.f_owner != p->p_ucred->cr_uid &&
+		    (error = suser(p->p_ucred, &p->p_acflag))) {
+			vput(vp);
+			return (error);
+		}
+		/*
+		 * Do not allow NFS export by non-root users. Silently
+		 * enforce MNT_NOSUID and MNT_NODEV for non-root users.
+		 */
+		if (p->p_ucred->cr_uid != 0) {
+			if (SCARG(uap, flags) & MNT_EXPORTED) {
+				vput(vp);
+				return (EPERM);
+			}
+			SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
+		}
+		if ((error = vfs_busy(mp, LK_NOWAIT, 0, p)) != 0) {
+			vput(vp);
+			return (error);
+		}
+		VOP_UNLOCK(vp, 0, p);
+		goto update;
+	}
+	/*
+	 * If the user is not root, ensure that they own the directory
+	 * onto which we are attempting to mount.
+	 */
+	if ((error = VOP_GETATTR(vp, &va, p->p_ucred, p)) ||
+	    (va.va_uid != p->p_ucred->cr_uid &&
+	    (error = suser(p->p_ucred, &p->p_acflag)))) {
+		vput(vp);
+		return (error);
+	}
+	/*
+	 * Do not allow NFS export by non-root users. Silently
+	 * enforce MNT_NOSUID and MNT_NODEV for non-root users.
+	 */
+	if (p->p_ucred->cr_uid != 0) {
+		if (SCARG(uap, flags) & MNT_EXPORTED) {
+			vput(vp);
+			return (EPERM);
+		}
+		SCARG(uap, flags) |= MNT_NOSUID | MNT_NODEV;
+	}
+	if ((error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) != 0)
+		return (error);
+	if (vp->v_type != VDIR) {
+		vput(vp);
+		return (ENOTDIR);
+	}
+	error = copyinstr(SCARG(uap, type), fstypename, MFSNAMELEN, NULL);
+	if (error) {
+#ifdef COMPAT_43
+		/*
+		 * Historically filesystem types were identified by number.
+		 * If we get an integer for the filesystem type instead of a
+		 * string, we check to see if it matches one of the historic
+		 * filesystem types.
+		 */
+		fstypenum = (u_long)SCARG(uap, type);
+
+		for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
+			if (vfsp->vfc_typenum == fstypenum)
+				break;
+		if (vfsp == NULL) {
+			vput(vp);
+			return (ENODEV);
+		}
+		strncpy(fstypename, vfsp->vfc_name, MFSNAMELEN);
+
+#else
+		vput(vp);
+		return (error);
+#endif
+	}
+	for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next) {
+		if (!strcmp(vfsp->vfc_name, fstypename))
+			break;
+	}
+
+	if (vfsp == NULL) {
+		vput(vp);
+		return (EOPNOTSUPP);
+	}
+
+	if (vp->v_mountedhere != NULL) {
+		vput(vp);
+		return (EBUSY);
+	}
+
+	/*
+	 * Allocate and initialize the file system.
+	 */
+	mp = (struct mount *)malloc((u_long)sizeof(struct mount),
+		M_MOUNT, M_WAITOK);
+	bzero((char *)mp, (u_long)sizeof(struct mount));
+	lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
+	/* This error never happens, but it makes auditing easier */
+	if ((error = vfs_busy(mp, LK_NOWAIT, 0, p)))
+		return (error);
+	mp->mnt_op = vfsp->vfc_vfsops;
+	mp->mnt_vfc = vfsp;
+	mp->mnt_flag |= (vfsp->vfc_flags & MNT_VISFLAGMASK);
+	strncpy(mp->mnt_stat.f_fstypename, vfsp->vfc_name, MFSNAMELEN);
+	mp->mnt_vnodecovered = vp;
+	mp->mnt_stat.f_owner = p->p_ucred->cr_uid;
+update:
+	/*
+	 * Set the mount level flags.
+	 */
+	if (SCARG(uap, flags) & MNT_RDONLY)
+		mp->mnt_flag |= MNT_RDONLY;
+	else if (mp->mnt_flag & MNT_RDONLY)
+		mp->mnt_flag |= MNT_WANTRDWR;
+	mp->mnt_flag &=~ (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
+	    MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC | MNT_SOFTDEP |
+	    MNT_NOATIME | MNT_FORCE);
+	mp->mnt_flag |= SCARG(uap, flags) & (MNT_NOSUID | MNT_NOEXEC |
+	    MNT_NODEV | MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
+	    MNT_SOFTDEP | MNT_NOATIME | MNT_FORCE);
+	/*
+	 * Mount the filesystem.
+	 */
+	error = VFS_MOUNT(mp, SCARG(uap, path), SCARG(uap, data), &nd, p);
+	if (!error) {
+		microtime(&tv);
+		mp->mnt_stat.f_ctime = tv.tv_sec;
+	}
+	if (mp->mnt_flag & MNT_UPDATE) {
+		vrele(vp);
+		if (mp->mnt_flag & MNT_WANTRDWR)
+			mp->mnt_flag &= ~MNT_RDONLY;
+		mp->mnt_flag &=~
+		    (MNT_UPDATE | MNT_RELOAD | MNT_FORCE | MNT_WANTRDWR);
+		if (error)
+			mp->mnt_flag = flag;
+
+ 		if ((mp->mnt_flag & MNT_RDONLY) == 0) {
+ 			if (mp->mnt_syncer == NULL)
+ 				error = vfs_allocate_syncvnode(mp);
+ 		} else {
+ 			if (mp->mnt_syncer != NULL)
+ 				vgone(mp->mnt_syncer);
+ 			mp->mnt_syncer = NULL;
+ 		}
+
+		vfs_unbusy(mp, p);
+		return (error);
+	}
+
+	vp->v_mountedhere = mp;
+
+	/*
+	 * Put the new filesystem on the mount list after root.
+	 */
+	cache_purge(vp);
+	if (!error) {
+		vfsp->vfc_refcount++;
+		simple_lock(&mountlist_slock);
+		CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
+		simple_unlock(&mountlist_slock);
+		checkdirs(vp);
+		VOP_UNLOCK(vp, 0, p);
+ 		if ((mp->mnt_flag & MNT_RDONLY) == 0)
+ 			error = vfs_allocate_syncvnode(mp);
+		vfs_unbusy(mp, p);
+		(void) VFS_STATFS(mp, &mp->mnt_stat, p);
+		if ((error = VFS_START(mp, 0, p)) != 0)
+			vrele(vp);
+	} else {
+		mp->mnt_vnodecovered->v_mountedhere = (struct mount *)0;
+		vfs_unbusy(mp, p);
+		free((caddr_t)mp, M_MOUNT);
+		vput(vp);
+	}
+	return (error);
+}
+
+/*
+ * Scan all active processes to see if any of them have a current
+ * or root directory onto which the new filesystem has just been
+ * mounted. If so, replace them with the new mount point.
+ */
+void
+checkdirs(olddp)
+	struct vnode *olddp;
+{
+	struct filedesc *fdp;
+	struct vnode *newdp;
+	struct proc *p;
+
+	if (olddp->v_usecount == 1)
+		return;
+	if (VFS_ROOT(olddp->v_mountedhere, &newdp))
+		panic("mount: lost mount");
+	for (p = LIST_FIRST(&allproc); p != 0; p = LIST_NEXT(p, p_list)) {
+		fdp = p->p_fd;
+		if (fdp->fd_cdir == olddp) {
+			vrele(fdp->fd_cdir);
+			VREF(newdp);
+			fdp->fd_cdir = newdp;
+		}
+		if (fdp->fd_rdir == olddp) {
+			vrele(fdp->fd_rdir);
+			VREF(newdp);
+			fdp->fd_rdir = newdp;
+		}
+	}
+	if (rootvnode == olddp) {
+		vrele(rootvnode);
+		VREF(newdp);
+		rootvnode = newdp;
+	}
+	vput(newdp);
+}
+
+/*
+ * Unmount a file system.
+ *
+ * Note: unmount takes a path to the vnode mounted on as argument,
+ * not special file (as before).
+ */
+/* ARGSUSED */
+int
+sys_unmount(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_unmount_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) flags;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct mount *mp;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	mp = vp->v_mount;
+
+	/*
+	 * Only root, or the user that did the original mount is
+	 * permitted to unmount this filesystem.
+	 */
+	if ((mp->mnt_stat.f_owner != p->p_ucred->cr_uid) &&
+	    (error = suser(p->p_ucred, &p->p_acflag))) {
+		vput(vp);
+		return (error);
+	}
+
+	/*
+	 * Don't allow unmounting the root file system.
+	 */
+	if (mp->mnt_flag & MNT_ROOTFS) {
+		vput(vp);
+		return (EINVAL);
+	}
+
+	/*
+	 * Must be the root of the filesystem
+	 */
+	if ((vp->v_flag & VROOT) == 0) {
+		vput(vp);
+		return (EINVAL);
+	}
+	vput(vp);
+
+	if (vfs_busy(mp, LK_EXCLUSIVE, NULL, p))
+		return (EBUSY);
+
+	return (dounmount(mp, SCARG(uap, flags), p, vp));
+}
+
+/*
+ * Do the actual file system unmount.
+ */
+int
+dounmount(struct mount *mp, int flags, struct proc *p, struct vnode *olddp)
+{
+	struct vnode *coveredvp;
+	struct proc *p2;
+	int error;
+	int hadsyncer = 0;
+
+ 	mp->mnt_flag &=~ MNT_ASYNC;
+ 	cache_purgevfs(mp);	/* remove cache entries for this file sys */
+ 	if (mp->mnt_syncer != NULL) {
+		hadsyncer = 1;
+ 		vgone(mp->mnt_syncer);
+		mp->mnt_syncer = NULL;
+	}
+	if (((mp->mnt_flag & MNT_RDONLY) ||
+	    (error = VFS_SYNC(mp, MNT_WAIT, p->p_ucred, p)) == 0) ||
+ 	    (flags & MNT_FORCE))
+ 		error = VFS_UNMOUNT(mp, flags, p);
+	simple_lock(&mountlist_slock);
+ 	if (error) {
+ 		if ((mp->mnt_flag & MNT_RDONLY) == 0 && hadsyncer)
+ 			(void) vfs_allocate_syncvnode(mp);
+		lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK,
+		    &mountlist_slock, p);
+		return (error);
+	}
+	CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
+	if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
+		if (olddp) {
+			/* 
+			 * Try to put processes back in a real directory
+			 * after a forced unmount.
+			 * XXX We're not holding a ref on olddp, which may
+			 * change, so compare id numbers.
+			 */
+			LIST_FOREACH(p2, &allproc, p_list) {
+				struct filedesc *fdp = p2->p_fd;
+				if (fdp->fd_cdir &&
+				    fdp->fd_cdir->v_id == olddp->v_id) {
+					vrele(fdp->fd_cdir);
+					vref(coveredvp);
+					fdp->fd_cdir = coveredvp;
+				}
+				if (fdp->fd_rdir &&
+				    fdp->fd_rdir->v_id == olddp->v_id) {
+					vrele(fdp->fd_rdir);
+					vref(coveredvp);
+					fdp->fd_rdir = coveredvp;
+				}
+			}
+		}
+		coveredvp->v_mountedhere = NULL;
+ 		vrele(coveredvp);
+ 	}
+	mp->mnt_vfc->vfc_refcount--;
+	if (mp->mnt_vnodelist.lh_first != NULL)
+		panic("unmount: dangling vnode");
+	lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK, &mountlist_slock, p);
+	free((caddr_t)mp, M_MOUNT);
+	return (0);
+}
+
+/*
+ * Sync each mounted filesystem.
+ */
+#ifdef DEBUG
+int syncprt = 0;
+struct ctldebug debug0 = { "syncprt", &syncprt };
+#endif
+
+/* ARGSUSED */
+int
+sys_sync(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct mount *mp, *nmp;
+	int asyncflag;
+
+	simple_lock(&mountlist_slock);
+	for (mp = CIRCLEQ_LAST(&mountlist); mp != CIRCLEQ_END(&mountlist);
+	    mp = nmp) {
+		if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
+			nmp = CIRCLEQ_PREV(mp, mnt_list);
+			continue;
+		}
+		if ((mp->mnt_flag & MNT_RDONLY) == 0) {
+			asyncflag = mp->mnt_flag & MNT_ASYNC;
+			mp->mnt_flag &= ~MNT_ASYNC;
+			uvm_vnp_sync(mp);
+			VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
+			if (asyncflag)
+				mp->mnt_flag |= MNT_ASYNC;
+		}
+		simple_lock(&mountlist_slock);
+		nmp = CIRCLEQ_PREV(mp, mnt_list);
+		vfs_unbusy(mp, p);
+	}
+	simple_unlock(&mountlist_slock);
+
+#ifdef DEBUG
+	if (syncprt)
+		vfs_bufstats();
+#endif /* DEBUG */
+	return (0);
+}
+
+/*
+ * Change filesystem quotas.
+ */
+/* ARGSUSED */
+int
+sys_quotactl(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_quotactl_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) cmd;
+		syscallarg(int) uid;
+		syscallarg(caddr_t) arg;
+	} */ *uap = v;
+	register struct mount *mp;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	mp = nd.ni_vp->v_mount;
+	vrele(nd.ni_vp);
+	return (VFS_QUOTACTL(mp, SCARG(uap, cmd), SCARG(uap, uid),
+	    SCARG(uap, arg), p));
+}
+
+/*
+ * Get filesystem statistics.
+ */
+/* ARGSUSED */
+int
+sys_statfs(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_statfs_args /* {
+		syscallarg(char *) path;
+		syscallarg(struct statfs *) buf;
+	} */ *uap = v;
+	register struct mount *mp;
+	register struct statfs *sp;
+	int error;
+	struct nameidata nd;
+	struct statfs sb;
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	mp = nd.ni_vp->v_mount;
+	sp = &mp->mnt_stat;
+	vrele(nd.ni_vp);
+	if ((error = VFS_STATFS(mp, sp, p)) != 0)
+		return (error);
+	sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+#if notyet
+	if (mp->mnt_flag & MNT_SOFTDEP)
+		sp->f_eflags = STATFS_SOFTUPD;
+#endif
+	/* Don't let non-root see filesystem id (for NFS security) */
+	if (suser(p->p_ucred, &p->p_acflag)) {
+		bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
+		sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
+		sp = &sb;
+	}
+	return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
+}
+
+/*
+ * Get filesystem statistics.
+ */
+/* ARGSUSED */
+int
+sys_fstatfs(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_fstatfs_args /* {
+		syscallarg(int) fd;
+		syscallarg(struct statfs *) buf;
+	} */ *uap = v;
+	struct file *fp;
+	struct mount *mp;
+	struct statfs *sp;
+	int error;
+	struct statfs sb;
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	mp = ((struct vnode *)fp->f_data)->v_mount;
+	sp = &mp->mnt_stat;
+	error = VFS_STATFS(mp, sp, p);
+	FRELE(fp);
+	if (error)
+		return (error);
+	sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+#if notyet
+	if (mp->mnt_flag & MNT_SOFTDEP)
+		sp->f_eflags = STATFS_SOFTUPD;
+#endif
+	/* Don't let non-root see filesystem id (for NFS security) */
+	if (suser(p->p_ucred, &p->p_acflag)) {
+		bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
+		sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
+		sp = &sb;
+	}
+	return (copyout((caddr_t)sp, (caddr_t)SCARG(uap, buf), sizeof(*sp)));
+}
+
+/*
+ * Get statistics on all filesystems.
+ */
+int
+sys_getfsstat(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_getfsstat_args /* {
+		syscallarg(struct statfs *) buf;
+		syscallarg(size_t) bufsize;
+		syscallarg(int) flags;
+	} */ *uap = v;
+	register struct mount *mp, *nmp;
+	register struct statfs *sp;
+	struct statfs sb;
+	caddr_t sfsp;
+	size_t count, maxcount;
+	int error, flags = SCARG(uap, flags);
+
+	maxcount = SCARG(uap, bufsize) / sizeof(struct statfs);
+	sfsp = (caddr_t)SCARG(uap, buf);
+	count = 0;
+	simple_lock(&mountlist_slock);
+	for (mp = CIRCLEQ_FIRST(&mountlist); mp != CIRCLEQ_END(&mountlist);
+	    mp = nmp) {
+		if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
+			nmp = CIRCLEQ_NEXT(mp, mnt_list);
+			continue;
+		}
+		if (sfsp && count < maxcount) {
+			sp = &mp->mnt_stat;
+
+			/* Refresh stats unless MNT_NOWAIT is specified */
+			if (flags != MNT_NOWAIT &&
+			    flags != MNT_LAZY &&
+			    (flags == MNT_WAIT ||
+			    flags == 0) &&
+			    (error = VFS_STATFS(mp, sp, p))) {
+				simple_lock(&mountlist_slock);
+				nmp = CIRCLEQ_NEXT(mp, mnt_list);
+				vfs_unbusy(mp, p);
+ 				continue;
+			}
+
+			sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+#if notyet
+			if (mp->mnt_flag & MNT_SOFTDEP)
+				sp->f_eflags = STATFS_SOFTUPD;
+#endif
+			if (suser(p->p_ucred, &p->p_acflag)) {
+				bcopy((caddr_t)sp, (caddr_t)&sb, sizeof(sb));
+				sb.f_fsid.val[0] = sb.f_fsid.val[1] = 0;
+				sp = &sb;
+			}
+			error = copyout((caddr_t)sp, sfsp, sizeof(*sp));
+			if (error) {
+				vfs_unbusy(mp, p);
+				return (error);
+			}
+			sfsp += sizeof(*sp);
+		}
+		count++;
+		simple_lock(&mountlist_slock);
+		nmp = CIRCLEQ_NEXT(mp, mnt_list);
+		vfs_unbusy(mp, p);
+	}
+	simple_unlock(&mountlist_slock);
+	if (sfsp && count > maxcount)
+		*retval = maxcount;
+	else
+		*retval = count;
+	return (0);
+}
+
+/*
+ * Change current working directory to a given file descriptor.
+ */
+/* ARGSUSED */
+int
+sys_fchdir(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_fchdir_args /* {
+		syscallarg(int) fd;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct vnode *vp, *tdp;
+	struct mount *mp;
+	struct file *fp;
+	int error;
+
+	if ((error = getvnode(fdp, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	vp = (struct vnode *)fp->f_data;
+	VREF(vp);
+	FRELE(fp);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_type != VDIR)
+		error = ENOTDIR;
+	else
+		error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
+
+	while (!error && (mp = vp->v_mountedhere) != NULL) {
+		if (vfs_busy(mp, 0, 0, p))
+			continue;
+		error = VFS_ROOT(mp, &tdp);
+		vfs_unbusy(mp, p);
+		if (error)
+			break;
+		vput(vp);
+		vp = tdp;
+	}
+	if (error) {
+		vput(vp);
+		return (error);
+	}
+	VOP_UNLOCK(vp, 0, p);
+	vrele(fdp->fd_cdir);
+	fdp->fd_cdir = vp;
+	return (0);
+}
+
+/*
+ * Change current working directory (``.'').
+ */
+/* ARGSUSED */
+int
+sys_chdir(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_chdir_args /* {
+		syscallarg(char *) path;
+	} */ *uap = v;
+	register struct filedesc *fdp = p->p_fd;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = change_dir(&nd, p)) != 0)
+		return (error);
+	vrele(fdp->fd_cdir);
+	fdp->fd_cdir = nd.ni_vp;
+	return (0);
+}
+
+/*
+ * Change notion of root (``/'') directory.
+ */
+/* ARGSUSED */
+int
+sys_chroot(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_chroot_args /* {
+		syscallarg(char *) path;
+	} */ *uap = v;
+	register struct filedesc *fdp = p->p_fd;
+	int error;
+	struct nameidata nd;
+
+	if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
+		return (error);
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = change_dir(&nd, p)) != 0)
+		return (error);
+	if (fdp->fd_rdir != NULL) {
+		/*
+		 * A chroot() done inside a changed root environment does
+		 * an automatic chdir to avoid the out-of-tree experience.
+		 */
+		vrele(fdp->fd_rdir);
+		vrele(fdp->fd_cdir);
+		VREF(nd.ni_vp);
+		fdp->fd_cdir = nd.ni_vp;
+	}
+	fdp->fd_rdir = nd.ni_vp;
+	return (0);
+}
+
+/*
+ * Common routine for chroot and chdir.
+ */
+static int
+change_dir(ndp, p)
+	register struct nameidata *ndp;
+	struct proc *p;
+{
+	struct vnode *vp;
+	int error;
+
+	if ((error = namei(ndp)) != 0)
+		return (error);
+	vp = ndp->ni_vp;
+	if (vp->v_type != VDIR)
+		error = ENOTDIR;
+	else
+		error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p);
+	if (error)
+		vput(vp);
+	else
+		VOP_UNLOCK(vp, 0, p);
+	return (error);
+}
+
+/*
+ * Check permissions, allocate an open file structure,
+ * and call the device open routine if any.
+ */
+int
+sys_open(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_open_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) flags;
+		syscallarg(int) mode;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp;
+	struct vnode *vp;
+	struct vattr vattr;
+	int flags, cmode;
+	int type, indx, error, localtrunc = 0;
+	struct flock lf;
+	struct nameidata nd;
+
+	if ((error = falloc(p, &fp, &indx)) != 0)
+		return (error);
+
+	flags = FFLAGS(SCARG(uap, flags));
+	cmode = ((SCARG(uap, mode) &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	p->p_dupfd = -indx - 1;			/* XXX check for fdopen */
+	if ((flags & O_TRUNC) && (flags & (O_EXLOCK | O_SHLOCK))) {
+		localtrunc = 1;
+		flags &= ~O_TRUNC;	/* Must do truncate ourselves */
+	}
+	if ((error = vn_open(&nd, flags, cmode)) != 0) {
+		if ((error == ENODEV || error == ENXIO) &&
+		    p->p_dupfd >= 0 &&			/* XXX from fdopen */
+		    (error =
+			dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) {
+			closef(fp, p);
+			*retval = indx;
+			return (0);
+		}
+		if (error == ERESTART)
+			error = EINTR;
+		fdremove(fdp, indx);
+		closef(fp, p);
+		return (error);
+	}
+	p->p_dupfd = 0;
+	vp = nd.ni_vp;
+	fp->f_flag = flags & FMASK;
+	fp->f_type = DTYPE_VNODE;
+	fp->f_ops = &vnops;
+	fp->f_data = (caddr_t)vp;
+	if (flags & (O_EXLOCK | O_SHLOCK)) {
+		lf.l_whence = SEEK_SET;
+		lf.l_start = 0;
+		lf.l_len = 0;
+		if (flags & O_EXLOCK)
+			lf.l_type = F_WRLCK;
+		else
+			lf.l_type = F_RDLCK;
+		type = F_FLOCK;
+		if ((flags & FNONBLOCK) == 0)
+			type |= F_WAIT;
+		VOP_UNLOCK(vp, 0, p);
+		error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
+		if (error) {
+			/* closef will vn_close the file for us. */
+			fdremove(fdp, indx);
+			closef(fp, p);
+			return (error);
+		}
+		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+		fp->f_flag |= FHASLOCK;
+	}
+	if (localtrunc) {
+		VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+		if ((fp->f_flag & FWRITE) == 0)
+			error = EACCES;
+		else if (vp->v_mount->mnt_flag & MNT_RDONLY)
+			error = EROFS;
+		else if (vp->v_type == VDIR)
+			error = EISDIR;
+		else if ((error = vn_writechk(vp)) == 0) {
+			VATTR_NULL(&vattr);
+			vattr.va_size = 0;
+			error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
+		}
+		if (error) {
+			VOP_UNLOCK(vp, 0, p);
+			/* closef will close the file for us. */
+			fdremove(fdp, indx);
+			closef(fp, p);
+			return (error);
+		}
+	}
+	VOP_UNLOCK(vp, 0, p);
+	*retval = indx;
+	FILE_SET_MATURE(fp);
+	return (0);
+}
+
+/*
+ * Get file handle system call
+ */
+int
+sys_getfh(p, v, retval)
+	struct proc *p;
+	register void *v;
+	register_t *retval;
+{
+	register struct sys_getfh_args /* {
+		syscallarg(char *) fname;
+		syscallarg(fhandle_t *) fhp;
+	} */ *uap = v;
+	register struct vnode *vp;
+	fhandle_t fh;
+	int error;
+	struct nameidata nd;
+
+	/*
+	 * Must be super user
+	 */
+	error = suser(p->p_ucred, &p->p_acflag);
+	if (error)
+		return (error);
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, fname), p);
+	error = namei(&nd);
+	if (error)
+		return (error);
+	vp = nd.ni_vp;
+	bzero((caddr_t)&fh, sizeof(fh));
+	fh.fh_fsid = vp->v_mount->mnt_stat.f_fsid;
+	error = VFS_VPTOFH(vp, &fh.fh_fid);
+	vput(vp);
+	if (error)
+		return (error);
+	error = copyout((caddr_t)&fh, (caddr_t)SCARG(uap, fhp), sizeof (fh));
+	return (error);
+}
+
+/*
+ * Open a file given a file handle.
+ *
+ * Check permissions, allocate an open file structure,
+ * and call the device open routine if any.
+ */
+int
+sys_fhopen(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_fhopen_args /* {
+		syscallarg(const fhandle_t *) fhp;
+		syscallarg(int) flags;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp;
+	struct vnode *vp = NULL;
+	struct mount *mp;
+	struct ucred *cred = p->p_ucred;
+	int flags;
+	int type, indx, error=0;
+	struct flock lf;
+	struct vattr va;
+	fhandle_t fh;
+
+	/*
+	 * Must be super user
+	 */
+	if ((error = suser(p->p_ucred, &p->p_acflag)))
+		return (error);
+
+	flags = FFLAGS(SCARG(uap, flags));
+	if ((flags & (FREAD | FWRITE)) == 0)
+		return (EINVAL);
+	if ((flags & O_CREAT))
+		return (EINVAL);
+
+	if ((error = falloc(p, &fp, &indx)) != 0)
+		return (error);
+
+	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
+		goto bad;
+
+	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL) {
+		error = ESTALE;
+		goto bad;
+	}
+
+	if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)) != 0) {
+		vp = NULL;	/* most likely unnecessary sanity for bad: */
+		goto bad;
+	}
+
+	/* Now do an effective vn_open */
+
+	if (vp->v_type == VSOCK) {
+		error = EOPNOTSUPP;
+		goto bad;
+	}
+	if (flags & FREAD) {
+		if ((error = VOP_ACCESS(vp, VREAD, cred, p)) != 0)
+			goto bad;
+	}
+	if (flags & (FWRITE | O_TRUNC)) {
+		if (vp->v_type == VDIR) {
+			error = EISDIR;
+			goto bad;
+		}
+		if ((error = vn_writechk(vp)) != 0 ||
+		    (error = VOP_ACCESS(vp, VWRITE, cred, p)) != 0)
+			goto bad;
+	}
+	if (flags & O_TRUNC) {
+		VOP_UNLOCK(vp, 0, p);				/* XXX */
+		VOP_LEASE(vp, p, cred, LEASE_WRITE);
+		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);	/* XXX */
+		VATTR_NULL(&va);
+		va.va_size = 0;
+		if ((error = VOP_SETATTR(vp, &va, cred, p)) != 0)
+			goto bad;
+	}
+	if ((error = VOP_OPEN(vp, flags, cred, p)) != 0)
+		goto bad;
+	if (flags & FWRITE)
+		vp->v_writecount++;
+
+	/* done with modified vn_open, now finish what sys_open does. */
+
+	fp->f_flag = flags & FMASK;
+	fp->f_type = DTYPE_VNODE;
+	fp->f_ops = &vnops;
+	fp->f_data = (caddr_t)vp;
+	if (flags & (O_EXLOCK | O_SHLOCK)) {
+		lf.l_whence = SEEK_SET;
+		lf.l_start = 0;
+		lf.l_len = 0;
+		if (flags & O_EXLOCK)
+			lf.l_type = F_WRLCK;
+		else
+			lf.l_type = F_RDLCK;
+		type = F_FLOCK;
+		if ((flags & FNONBLOCK) == 0)
+			type |= F_WAIT;
+		VOP_UNLOCK(vp, 0, p);
+		error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type);
+		if (error) {
+			/* closef will vn_close the file for us. */
+			fdremove(fdp, indx);
+			closef(fp, p);
+			return (error);
+		}
+		vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+		fp->f_flag |= FHASLOCK;
+	}
+	VOP_UNLOCK(vp, 0, p);
+	*retval = indx;
+	FILE_SET_MATURE(fp);
+	return (0);
+
+bad:
+	fdremove(fdp, indx);
+	closef(fp, p);
+	if (vp != NULL)
+		vput(vp);
+	return (error);
+}
+
+/* ARGSUSED */
+int
+sys_fhstat(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_fhstat_args /* {
+		syscallarg(const fhandle_t *) fhp;
+		syscallarg(struct stat *) sb;
+	} */ *uap = v;
+	struct stat sb;
+	int error;
+	fhandle_t fh;
+	struct mount *mp;
+	struct vnode *vp;
+
+	/*
+	 * Must be super user
+	 */
+	if ((error = suser(p->p_ucred, &p->p_acflag)))
+		return (error);
+
+	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
+		return (error);
+
+	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
+		return (ESTALE);
+	if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
+		return (error);
+	error = vn_stat(vp, &sb, p);
+	vput(vp);
+	if (error)
+		return (error);
+	error = copyout(&sb, SCARG(uap, sb), sizeof(sb));
+	return (error);
+}
+
+/* ARGSUSED */
+int
+sys_fhstatfs(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_fhstatfs_args /*
+		syscallarg(const fhandle_t *) fhp;
+		syscallarg(struct statfs *) buf;
+	} */ *uap = v;
+	struct statfs sp;
+	fhandle_t fh;
+	struct mount *mp;
+	struct vnode *vp;
+	int error;
+
+	/*
+	 * Must be super user
+	 */
+	if ((error = suser(p->p_ucred, &p->p_acflag)))
+		return (error);
+
+	if ((error = copyin(SCARG(uap, fhp), &fh, sizeof(fhandle_t))) != 0)
+		return (error);
+
+	if ((mp = vfs_getvfs(&fh.fh_fsid)) == NULL)
+		return (ESTALE);
+	if ((error = VFS_FHTOVP(mp, &fh.fh_fid, &vp)))
+		return (error);
+	mp = vp->v_mount;
+	vput(vp);
+	if ((error = VFS_STATFS(mp, &sp, p)) != 0)
+		return (error);
+	sp.f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
+	return (copyout(&sp, SCARG(uap, buf), sizeof(sp)));
+}
+
+/*
+ * Create a special file.
+ */
+/* ARGSUSED */
+int
+sys_mknod(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_mknod_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) mode;
+		syscallarg(int) dev;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	int whiteout = 0;
+	struct nameidata nd;
+
+	if ((error = suser(p->p_ucred, &p->p_acflag)) != 0)
+		return (error);
+	if (p->p_fd->fd_rdir)
+		return (EINVAL);
+	NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	if (vp != NULL)
+		error = EEXIST;
+	else {
+		VATTR_NULL(&vattr);
+		vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask;
+		vattr.va_rdev = SCARG(uap, dev);
+		whiteout = 0;
+
+		switch (SCARG(uap, mode) & S_IFMT) {
+		case S_IFMT:	/* used by badsect to flag bad sectors */
+			vattr.va_type = VBAD;
+			break;
+		case S_IFCHR:
+			vattr.va_type = VCHR;
+			break;
+		case S_IFBLK:
+			vattr.va_type = VBLK;
+			break;
+		case S_IFWHT:
+			whiteout = 1;
+			break;
+		default:
+			error = EINVAL;
+			break;
+		}
+	}
+	if (!error) {
+		VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+		if (whiteout) {
+			error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, CREATE);
+			if (error)
+				VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+			vput(nd.ni_dvp);
+		} else {
+			error = VOP_MKNOD(nd.ni_dvp, &nd.ni_vp,
+						&nd.ni_cnd, &vattr);
+		}
+	} else {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		if (vp)
+			vrele(vp);
+	}
+	return (error);
+}
+
+/*
+ * Create a named pipe.
+ */
+/* ARGSUSED */
+int
+sys_mkfifo(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+#ifndef FIFO
+	return (EOPNOTSUPP);
+#else
+	register struct sys_mkfifo_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) mode;
+	} */ *uap = v;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	if (nd.ni_vp != NULL) {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == nd.ni_vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		vrele(nd.ni_vp);
+		return (EEXIST);
+	}
+	VATTR_NULL(&vattr);
+	vattr.va_type = VFIFO;
+	vattr.va_mode = (SCARG(uap, mode) & ALLPERMS) &~ p->p_fd->fd_cmask;
+	VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+	return (VOP_MKNOD(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr));
+#endif /* FIFO */
+}
+
+/*
+ * Make a hard file link.
+ */
+/* ARGSUSED */
+int
+sys_link(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_link_args /* {
+		syscallarg(char *) path;
+		syscallarg(char *) link;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct nameidata nd;
+	int error;
+	int flags;
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+
+	flags = LOCKPARENT;
+	if (vp->v_type == VDIR) {
+		flags |= STRIPSLASHES;
+	}
+
+	NDINIT(&nd, CREATE, flags, UIO_USERSPACE, SCARG(uap, link), p);
+	if ((error = namei(&nd)) != 0)
+		goto out;
+	if (nd.ni_vp) {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == nd.ni_vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		vrele(nd.ni_vp);
+		error = EEXIST;
+		goto out;
+	}
+	VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	error = VOP_LINK(nd.ni_dvp, vp, &nd.ni_cnd);
+out:
+	vrele(vp);
+	return (error);
+}
+
+/*
+ * Make a symbolic link.
+ */
+/* ARGSUSED */
+int
+sys_symlink(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_symlink_args /* {
+		syscallarg(char *) path;
+		syscallarg(char *) link;
+	} */ *uap = v;
+	struct vattr vattr;
+	char *path;
+	int error;
+	struct nameidata nd;
+
+	MALLOC(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
+	error = copyinstr(SCARG(uap, path), path, MAXPATHLEN, NULL);
+	if (error)
+		goto out;
+	NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, SCARG(uap, link), p);
+	if ((error = namei(&nd)) != 0)
+		goto out;
+	if (nd.ni_vp) {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == nd.ni_vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		vrele(nd.ni_vp);
+		error = EEXIST;
+		goto out;
+	}
+	VATTR_NULL(&vattr);
+	vattr.va_mode = ACCESSPERMS &~ p->p_fd->fd_cmask;
+	VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+	error = VOP_SYMLINK(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr, path);
+out:
+	FREE(path, M_NAMEI);
+	return (error);
+}
+
+/*
+ * Delete a whiteout from the filesystem.
+ */
+/* ARGSUSED */
+int
+sys_undelete(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_undelete_args /* {
+		syscallarg(char *) path;
+	} */ *uap = v;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	error = namei(&nd);
+	if (error)
+		return (error);
+
+	if (nd.ni_vp != NULLVP || !(nd.ni_cnd.cn_flags & ISWHITEOUT)) {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == nd.ni_vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		if (nd.ni_vp)
+			vrele(nd.ni_vp);
+		return (EEXIST);
+	}
+
+	VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+	if ((error = VOP_WHITEOUT(nd.ni_dvp, &nd.ni_cnd, DELETE)) != 0)
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+	vput(nd.ni_dvp);
+	return (error);
+}
+
+/*
+ * Delete a name from the filesystem.
+ */
+/* ARGSUSED */
+int
+sys_unlink(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_unlink_args /* {
+		syscallarg(char *) path;
+	} */ *uap = v;
+	register struct vnode *vp;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+
+	/*
+	 * The root of a mounted filesystem cannot be deleted.
+	 */
+	if (vp->v_flag & VROOT) {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		vput(vp);
+		error = EBUSY;
+		goto out;
+	}
+
+	(void)uvm_vnp_uncache(vp);
+
+	VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	error = VOP_REMOVE(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
+out:
+	return (error);
+}
+
+/*
+ * Reposition read/write file offset.
+ */
+int
+sys_lseek(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_lseek_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) pad;
+		syscallarg(off_t) offset;
+		syscallarg(int) whence;
+	} */ *uap = v;
+	struct ucred *cred = p->p_ucred;
+	register struct filedesc *fdp = p->p_fd;
+	register struct file *fp;
+	struct vattr vattr;
+	struct vnode *vp;
+	int error, special;
+
+	if ((fp = fd_getfile(fdp, SCARG(uap, fd))) == NULL)
+		return (EBADF);
+	if (fp->f_type != DTYPE_VNODE)
+		return (ESPIPE);
+	vp = (struct vnode *)fp->f_data;
+	if (vp->v_type == VFIFO)
+		return (ESPIPE);
+	if (vp->v_type == VCHR)
+		special = 1;
+	else
+		special = 0;
+	switch (SCARG(uap, whence)) {
+	case SEEK_CUR:
+		if (!special && fp->f_offset + SCARG(uap, offset) < 0)
+			return (EINVAL);
+		fp->f_offset += SCARG(uap, offset);
+		break;
+	case SEEK_END:
+		error = VOP_GETATTR((struct vnode *)fp->f_data, &vattr,
+				    cred, p);
+		if (error)
+			return (error);
+		if (!special && (off_t)vattr.va_size + SCARG(uap, offset) < 0)
+			return (EINVAL);
+		fp->f_offset = SCARG(uap, offset) + vattr.va_size;
+		break;
+	case SEEK_SET:
+		if (!special && SCARG(uap, offset) < 0)
+			return (EINVAL);
+		fp->f_offset = SCARG(uap, offset);
+		break;
+	default:
+		return (EINVAL);
+	}
+	*(off_t *)retval = fp->f_offset;
+	return (0);
+}
+
+/*
+ * Check access permissions.
+ */
+int
+sys_access(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_access_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) flags;
+	} */ *uap = v;
+	register struct ucred *cred = p->p_ucred;
+	register struct vnode *vp;
+	int error, flags, t_gid, t_uid;
+	struct nameidata nd;
+
+	if (SCARG(uap, flags) & ~(R_OK | W_OK | X_OK))
+		return (EINVAL);
+	t_uid = cred->cr_uid;
+	t_gid = cred->cr_gid;
+	cred->cr_uid = p->p_cred->p_ruid;
+	cred->cr_gid = p->p_cred->p_rgid;
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		goto out1;
+	vp = nd.ni_vp;
+
+	/* Flags == 0 means only check for existence. */
+	if (SCARG(uap, flags)) {
+		flags = 0;
+		if (SCARG(uap, flags) & R_OK)
+			flags |= VREAD;
+		if (SCARG(uap, flags) & W_OK)
+			flags |= VWRITE;
+		if (SCARG(uap, flags) & X_OK)
+			flags |= VEXEC;
+		if ((flags & VWRITE) == 0 || (error = vn_writechk(vp)) == 0)
+			error = VOP_ACCESS(vp, flags, cred, p);
+	}
+	vput(vp);
+out1:
+	cred->cr_uid = t_uid;
+	cred->cr_gid = t_gid;
+	return (error);
+}
+
+/*
+ * Get file status; this version follows links.
+ */
+/* ARGSUSED */
+int
+sys_stat(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_stat_args /* {
+		syscallarg(char *) path;
+		syscallarg(struct stat *) ub;
+	} */ *uap = v;
+	struct stat sb;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	error = vn_stat(nd.ni_vp, &sb, p);
+	vput(nd.ni_vp);
+	if (error)
+		return (error);
+	/* Don't let non-root see generation numbers (for NFS security) */
+	if (suser(p->p_ucred, &p->p_acflag))
+		sb.st_gen = 0;
+	error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
+	return (error);
+}
+
+/*
+ * Get file status; this version does not follow links.
+ */
+/* ARGSUSED */
+int
+sys_lstat(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_lstat_args /* {
+		syscallarg(char *) path;
+		syscallarg(struct stat *) ub;
+	} */ *uap = v;
+	struct stat sb;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	error = vn_stat(nd.ni_vp, &sb, p);
+	vput(nd.ni_vp);
+	if (error)
+		return (error);
+	/* Don't let non-root see generation numbers (for NFS security) */
+	if (suser(p->p_ucred, &p->p_acflag))
+		sb.st_gen = 0;
+	error = copyout((caddr_t)&sb, (caddr_t)SCARG(uap, ub), sizeof (sb));
+	return (error);
+}
+
+/*
+ * Get configurable pathname variables.
+ */
+/* ARGSUSED */
+int
+sys_pathconf(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_pathconf_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) name;
+	} */ *uap = v;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	error = VOP_PATHCONF(nd.ni_vp, SCARG(uap, name), retval);
+	vput(nd.ni_vp);
+	return (error);
+}
+
+/*
+ * Return target name of a symbolic link.
+ */
+/* ARGSUSED */
+int
+sys_readlink(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_readlink_args /* {
+		syscallarg(char *) path;
+		syscallarg(char *) buf;
+		syscallarg(size_t) count;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct iovec aiov;
+	struct uio auio;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	if (vp->v_type != VLNK)
+		error = EINVAL;
+	else {
+		aiov.iov_base = SCARG(uap, buf);
+		aiov.iov_len = SCARG(uap, count);
+		auio.uio_iov = &aiov;
+		auio.uio_iovcnt = 1;
+		auio.uio_offset = 0;
+		auio.uio_rw = UIO_READ;
+		auio.uio_segflg = UIO_USERSPACE;
+		auio.uio_procp = p;
+		auio.uio_resid = SCARG(uap, count);
+		error = VOP_READLINK(vp, &auio, p->p_ucred);
+	}
+	vput(vp);
+	*retval = SCARG(uap, count) - auio.uio_resid;
+	return (error);
+}
+
+/*
+ * Change flags of a file given a path name.
+ */
+/* ARGSUSED */
+int
+sys_chflags(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_chflags_args /* {
+		syscallarg(char *) path;
+		syscallarg(unsigned int) flags;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else if (SCARG(uap, flags) == VNOVAL)
+		error = EINVAL;
+	else {
+		if (suser(p->p_ucred, &p->p_acflag)) {
+			if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
+				goto out;
+			if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
+				error = EINVAL;
+				goto out;
+			}
+		}
+		VATTR_NULL(&vattr);
+		vattr.va_flags = SCARG(uap, flags);
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+out:
+	vput(vp);
+	return (error);
+}
+
+/*
+ * Change flags of a file given a file descriptor.
+ */
+/* ARGSUSED */
+int
+sys_fchflags(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_fchflags_args /* {
+		syscallarg(int) fd;
+		syscallarg(unsigned int) flags;
+	} */ *uap = v;
+	struct vattr vattr;
+	struct vnode *vp;
+	struct file *fp;
+	int error;
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	vp = (struct vnode *)fp->f_data;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else if (SCARG(uap, flags) == VNOVAL)
+		error = EINVAL;
+	else {
+		if (suser(p->p_ucred, &p->p_acflag)) {
+			if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
+			    != 0)
+				goto out;
+			if (vattr.va_type == VCHR || vattr.va_type == VBLK) {
+				error = EINVAL;
+				goto out;
+			}
+		}
+		VATTR_NULL(&vattr);
+		vattr.va_flags = SCARG(uap, flags);
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+out:
+	VOP_UNLOCK(vp, 0, p);
+	FRELE(fp);
+	return (error);
+}
+
+/*
+ * Change mode of a file given path name.
+ */
+/* ARGSUSED */
+int
+sys_chmod(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_chmod_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) mode;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+
+	if (SCARG(uap, mode) & ~(S_IFMT | ALLPERMS))
+		return (EINVAL);
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else {
+		VATTR_NULL(&vattr);
+		vattr.va_mode = SCARG(uap, mode) & ALLPERMS;
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+	vput(vp);
+	return (error);
+}
+
+/*
+ * Change mode of a file given a file descriptor.
+ */
+/* ARGSUSED */
+int
+sys_fchmod(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_fchmod_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) mode;
+	} */ *uap = v;
+	struct vattr vattr;
+	struct vnode *vp;
+	struct file *fp;
+	int error;
+
+	if (SCARG(uap, mode) & ~(S_IFMT | ALLPERMS))
+		return (EINVAL);
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	vp = (struct vnode *)fp->f_data;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else {
+		VATTR_NULL(&vattr);
+		vattr.va_mode = SCARG(uap, mode) & ALLPERMS;
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+	VOP_UNLOCK(vp, 0, p);
+	FRELE(fp);
+	return (error);
+}
+
+/*
+ * Set ownership given a path name.
+ */
+/* ARGSUSED */
+int
+sys_chown(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_chown_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) uid;
+		syscallarg(int) gid;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+	u_short mode;
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else {
+		if ((SCARG(uap, uid) != -1 || SCARG(uap, gid) != -1) &&
+		    (suser(p->p_ucred, &p->p_acflag) || suid_clear)) {
+			error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
+			if (error)
+				goto out;
+			mode = vattr.va_mode & ~(VSUID | VSGID);
+			if (mode == vattr.va_mode)
+				mode = VNOVAL;
+		}
+		else
+			mode = VNOVAL;
+		VATTR_NULL(&vattr);
+		vattr.va_uid = SCARG(uap, uid);
+		vattr.va_gid = SCARG(uap, gid);
+		vattr.va_mode = mode;
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+out:
+	vput(vp);
+	return (error);
+}
+
+/*
+ * Set ownership given a path name, without following links.
+ */
+/* ARGSUSED */
+int
+sys_lchown(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_lchown_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) uid;
+		syscallarg(int) gid;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+	u_short mode;
+
+	NDINIT(&nd, LOOKUP, NOFOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else {
+		if ((SCARG(uap, uid) != -1 || SCARG(uap, gid) != -1) &&
+		    (suser(p->p_ucred, &p->p_acflag) || suid_clear)) {
+			error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
+			if (error)
+				goto out;
+			mode = vattr.va_mode & ~(VSUID | VSGID);
+			if (mode == vattr.va_mode)
+				mode = VNOVAL;
+		}
+		else
+			mode = VNOVAL;
+		VATTR_NULL(&vattr);
+		vattr.va_uid = SCARG(uap, uid);
+		vattr.va_gid = SCARG(uap, gid);
+		vattr.va_mode = mode;
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+out:
+	vput(vp);
+	return (error);
+}
+
+/*
+ * Set ownership given a file descriptor.
+ */
+/* ARGSUSED */
+int
+sys_fchown(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_fchown_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) uid;
+		syscallarg(int) gid;
+	} */ *uap = v;
+	struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct file *fp;
+	u_short mode;
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	vp = (struct vnode *)fp->f_data;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else {
+		if ((SCARG(uap, uid) != -1 || SCARG(uap, gid) != -1) &&
+		    (suser(p->p_ucred, &p->p_acflag) || suid_clear)) {
+			error = VOP_GETATTR(vp, &vattr, p->p_ucred, p);
+			if (error)
+				goto out;
+			mode = vattr.va_mode & ~(VSUID | VSGID);
+			if (mode == vattr.va_mode)
+				mode = VNOVAL;
+		} else
+			mode = VNOVAL;
+		VATTR_NULL(&vattr);
+		vattr.va_uid = SCARG(uap, uid);
+		vattr.va_gid = SCARG(uap, gid);
+		vattr.va_mode = mode;
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+out:
+	VOP_UNLOCK(vp, 0, p);
+	FRELE(fp);
+	return (error);
+}
+
+/*
+ * Set the access and modification times given a path name.
+ */
+/* ARGSUSED */
+int
+sys_utimes(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_utimes_args /* {
+		syscallarg(char *) path;
+		syscallarg(struct timeval *) tptr;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct timeval tv[2];
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+
+	VATTR_NULL(&vattr);
+	if (SCARG(uap, tptr) == NULL) {
+		microtime(&tv[0]);
+		tv[1] = tv[0];
+		vattr.va_vaflags |= VA_UTIMES_NULL;
+	} else {
+		error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv,
+		    sizeof (tv));
+		if (error)
+			return (error);
+		/* XXX workaround timeval matching the VFS constant VNOVAL */
+		if (tv[0].tv_sec == VNOVAL)
+			tv[0].tv_sec = VNOVAL - 1;
+		if (tv[1].tv_sec == VNOVAL)
+			tv[1].tv_sec = VNOVAL - 1;
+	}
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else {
+		vattr.va_atime.tv_sec = tv[0].tv_sec;
+		vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
+		vattr.va_mtime.tv_sec = tv[1].tv_sec;
+		vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+	vput(vp);
+	return (error);
+}
+
+
+/*
+ * Set the access and modification times given a file descriptor.
+ */
+/* ARGSUSED */
+int
+sys_futimes(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_futimes_args /* {
+		syscallarg(int) fd;
+		syscallarg(struct timeval *) tptr;
+	} */ *uap = v;
+	struct vnode *vp;
+	struct timeval tv[2];
+	struct vattr vattr;
+	int error;
+	struct file *fp;
+
+	VATTR_NULL(&vattr);
+	if (SCARG(uap, tptr) == NULL) {
+		microtime(&tv[0]);
+		tv[1] = tv[0];
+		vattr.va_vaflags |= VA_UTIMES_NULL;
+	} else {
+		error = copyin((caddr_t)SCARG(uap, tptr), (caddr_t)tv,
+		    sizeof (tv));
+		if (error)
+			return (error);
+		/* XXX workaround timeval matching the VFS constant VNOVAL */
+		if (tv[0].tv_sec == VNOVAL)
+			tv[0].tv_sec = VNOVAL - 1;
+		if (tv[1].tv_sec == VNOVAL)
+			tv[1].tv_sec = VNOVAL - 1;
+	}
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	vp = (struct vnode *)fp->f_data;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_mount->mnt_flag & MNT_RDONLY)
+		error = EROFS;
+	else {
+		vattr.va_atime.tv_sec = tv[0].tv_sec;
+		vattr.va_atime.tv_nsec = tv[0].tv_usec * 1000;
+		vattr.va_mtime.tv_sec = tv[1].tv_sec;
+		vattr.va_mtime.tv_nsec = tv[1].tv_usec * 1000;
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+	VOP_UNLOCK(vp, 0, p);
+	FRELE(fp);
+	return (error);
+}
+
+/*
+ * Truncate a file given its path name.
+ */
+/* ARGSUSED */
+int
+sys_truncate(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_truncate_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) pad;
+		syscallarg(off_t) length;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_type == VDIR)
+		error = EISDIR;
+	else if ((error = vn_writechk(vp)) == 0 &&
+	    (error = VOP_ACCESS(vp, VWRITE, p->p_ucred, p)) == 0) {
+		VATTR_NULL(&vattr);
+		vattr.va_size = SCARG(uap, length);
+		error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
+	}
+	vput(vp);
+	return (error);
+}
+
+/*
+ * Truncate a file given a file descriptor.
+ */
+/* ARGSUSED */
+int
+sys_ftruncate(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_ftruncate_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) pad;
+		syscallarg(off_t) length;
+	} */ *uap = v;
+	struct vattr vattr;
+	struct vnode *vp;
+	struct file *fp;
+	int error;
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	if ((fp->f_flag & FWRITE) == 0) {
+		error = EINVAL;
+		goto bad;
+	}
+	vp = (struct vnode *)fp->f_data;
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	if (vp->v_type == VDIR)
+		error = EISDIR;
+	else if ((error = vn_writechk(vp)) == 0) {
+		VATTR_NULL(&vattr);
+		vattr.va_size = SCARG(uap, length);
+		error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
+	}
+	VOP_UNLOCK(vp, 0, p);
+bad:
+	FRELE(fp);
+	return (error);
+}
+
+/*
+ * Sync an open file.
+ */
+/* ARGSUSED */
+int
+sys_fsync(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_fsync_args /* {
+		syscallarg(int) fd;
+	} */ *uap = v;
+	struct vnode *vp;
+	struct file *fp;
+	int error;
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	vp = (struct vnode *)fp->f_data;
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	error = VOP_FSYNC(vp, fp->f_cred, MNT_WAIT, p);
+#ifdef FFS_SOFTUPDATES
+	if (error == 0 && vp->v_mount && (vp->v_mount->mnt_flag & MNT_SOFTDEP))
+		error = softdep_fsync(vp);
+#endif
+
+	VOP_UNLOCK(vp, 0, p);
+	FRELE(fp);
+	return (error);
+}
+
+/*
+ * Rename files.  Source and destination must either both be directories,
+ * or both not be directories.  If target is a directory, it must be empty.
+ */
+/* ARGSUSED */
+int
+sys_rename(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_rename_args /* {
+		syscallarg(char *) from;
+		syscallarg(char *) to;
+	} */ *uap = v;
+	register struct vnode *tvp, *fvp, *tdvp;
+	struct nameidata fromnd, tond;
+	int error;
+	int flags;
+
+	NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
+	    SCARG(uap, from), p);
+	if ((error = namei(&fromnd)) != 0)
+		return (error);
+	fvp = fromnd.ni_vp;
+
+	flags = LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART;
+	/*
+	 * rename("foo/", "bar/");  is  OK
+	 */
+	if (fvp->v_type == VDIR)
+		flags |= STRIPSLASHES;
+
+	NDINIT(&tond, RENAME, flags,
+	    UIO_USERSPACE, SCARG(uap, to), p);
+	if ((error = namei(&tond)) != 0) {
+		VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
+		vrele(fromnd.ni_dvp);
+		vrele(fvp);
+		goto out1;
+	}
+	tdvp = tond.ni_dvp;
+	tvp = tond.ni_vp;
+	if (tvp != NULL) {
+		if (fvp->v_type == VDIR && tvp->v_type != VDIR) {
+			error = ENOTDIR;
+			goto out;
+		} else if (fvp->v_type != VDIR && tvp->v_type == VDIR) {
+			error = EISDIR;
+			goto out;
+		}
+	}
+	if (fvp == tdvp)
+		error = EINVAL;
+	/*
+	 * If source is the same as the destination (that is the
+	 * same inode number)
+	 */
+	if (fvp == tvp)
+		error = -1;
+out:
+	if (!error) {
+		VOP_LEASE(tdvp, p, p->p_ucred, LEASE_WRITE);
+		if (fromnd.ni_dvp != tdvp)
+			VOP_LEASE(fromnd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+		if (tvp) {
+			(void)uvm_vnp_uncache(tvp);
+			VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE);
+		}
+		error = VOP_RENAME(fromnd.ni_dvp, fromnd.ni_vp, &fromnd.ni_cnd,
+				   tond.ni_dvp, tond.ni_vp, &tond.ni_cnd);
+	} else {
+		VOP_ABORTOP(tond.ni_dvp, &tond.ni_cnd);
+		if (tdvp == tvp)
+			vrele(tdvp);
+		else
+			vput(tdvp);
+		if (tvp)
+			vput(tvp);
+		VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
+		vrele(fromnd.ni_dvp);
+		vrele(fvp);
+	}
+	vrele(tond.ni_startdir);
+	FREE(tond.ni_cnd.cn_pnbuf, M_NAMEI);
+out1:
+	if (fromnd.ni_startdir)
+		vrele(fromnd.ni_startdir);
+	FREE(fromnd.ni_cnd.cn_pnbuf, M_NAMEI);
+	if (error == -1)
+		return (0);
+	return (error);
+}
+
+/*
+ * Make a directory file.
+ */
+/* ARGSUSED */
+int
+sys_mkdir(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_mkdir_args /* {
+		syscallarg(char *) path;
+		syscallarg(int) mode;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, CREATE, LOCKPARENT | STRIPSLASHES,
+	    UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	if (vp != NULL) {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		vrele(vp);
+		return (EEXIST);
+	}
+	VATTR_NULL(&vattr);
+	vattr.va_type = VDIR;
+	vattr.va_mode = (SCARG(uap, mode) & ACCESSPERMS) &~ p->p_fd->fd_cmask;
+	VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+	error = VOP_MKDIR(nd.ni_dvp, &nd.ni_vp, &nd.ni_cnd, &vattr);
+	if (!error)
+		vput(nd.ni_vp);
+	return (error);
+}
+
+/*
+ * Remove a directory file.
+ */
+/* ARGSUSED */
+int
+sys_rmdir(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_rmdir_args /* {
+		syscallarg(char *) path;
+	} */ *uap = v;
+	register struct vnode *vp;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
+	    SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	if (vp->v_type != VDIR) {
+		error = ENOTDIR;
+		goto out;
+	}
+	/*
+	 * No rmdir "." please.
+	 */
+	if (nd.ni_dvp == vp) {
+		error = EBUSY;
+		goto out;
+	}
+	/*
+	 * The root of a mounted filesystem cannot be deleted.
+	 */
+	if (vp->v_flag & VROOT)
+		error = EBUSY;
+out:
+	if (!error) {
+		VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
+		VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+		error = VOP_RMDIR(nd.ni_dvp, nd.ni_vp, &nd.ni_cnd);
+	} else {
+		VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
+		if (nd.ni_dvp == vp)
+			vrele(nd.ni_dvp);
+		else
+			vput(nd.ni_dvp);
+		vput(vp);
+	}
+	return (error);
+}
+
+/*
+ * Read a block of directory entries in a file system independent format.
+ */
+int
+sys_getdirentries(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_getdirentries_args /* {
+		syscallarg(int) fd;
+		syscallarg(char *) buf;
+		syscallarg(int) count;
+		syscallarg(long *) basep;
+	} */ *uap = v;
+	struct vnode *vp;
+	struct file *fp;
+	struct uio auio;
+	struct iovec aiov;
+	long loff;
+	int error, eofflag;
+
+	if (SCARG(uap, count) < 0)
+		return EINVAL;
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+	if ((fp->f_flag & FREAD) == 0) {
+		error = EBADF;
+		goto bad;
+	}
+	vp = (struct vnode *)fp->f_data;
+unionread:
+	if (vp->v_type != VDIR) {
+		error = EINVAL;
+		goto bad;
+	}
+	aiov.iov_base = SCARG(uap, buf);
+	aiov.iov_len = SCARG(uap, count);
+	auio.uio_iov = &aiov;
+	auio.uio_iovcnt = 1;
+	auio.uio_rw = UIO_READ;
+	auio.uio_segflg = UIO_USERSPACE;
+	auio.uio_procp = p;
+	auio.uio_resid = SCARG(uap, count);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+	loff = auio.uio_offset = fp->f_offset;
+	error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag, 0, 0);
+	fp->f_offset = auio.uio_offset;
+	VOP_UNLOCK(vp, 0, p);
+	if (error)
+		goto bad;
+	if ((SCARG(uap, count) == auio.uio_resid) &&
+	    union_check_p &&
+	    (union_check_p(p, &vp, fp, auio, &error) != 0))
+		goto unionread;
+	if (error)
+		goto bad;
+
+	if ((SCARG(uap, count) == auio.uio_resid) &&
+	    (vp->v_flag & VROOT) &&
+	    (vp->v_mount->mnt_flag & MNT_UNION)) {
+		struct vnode *tvp = vp;
+		vp = vp->v_mount->mnt_vnodecovered;
+		VREF(vp);
+		fp->f_data = (caddr_t) vp;
+		fp->f_offset = 0;
+		vrele(tvp);
+		goto unionread;
+	}
+	error = copyout((caddr_t)&loff, (caddr_t)SCARG(uap, basep),
+	    sizeof(long));
+	*retval = SCARG(uap, count) - auio.uio_resid;
+bad:
+	FRELE(fp);
+	return (error);
+}
+
+/*
+ * Set the mode mask for creation of filesystem nodes.
+ */
+int
+sys_umask(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_umask_args /* {
+		syscallarg(int) newmask;
+	} */ *uap = v;
+	register struct filedesc *fdp;
+
+	fdp = p->p_fd;
+	*retval = fdp->fd_cmask;
+	fdp->fd_cmask = SCARG(uap, newmask) & ACCESSPERMS;
+	return (0);
+}
+
+/*
+ * Void all references to file by ripping underlying filesystem
+ * away from vnode.
+ */
+/* ARGSUSED */
+int
+sys_revoke(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	register struct sys_revoke_args /* {
+		syscallarg(char *) path;
+	} */ *uap = v;
+	register struct vnode *vp;
+	struct vattr vattr;
+	int error;
+	struct nameidata nd;
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+	vp = nd.ni_vp;
+	if ((error = VOP_GETATTR(vp, &vattr, p->p_ucred, p)) != 0)
+		goto out;
+	if (p->p_ucred->cr_uid != vattr.va_uid &&
+	    (error = suser(p->p_ucred, &p->p_acflag)))
+		goto out;
+	if (vp->v_usecount > 1 || (vp->v_flag & (VALIASED | VLAYER)))
+		VOP_REVOKE(vp, REVOKEALL);
+out:
+	vrele(vp);
+	return (error);
+}
+
+/*
+ * Convert a user file descriptor to a kernel file entry.
+ *
+ * On return *fpp is FREF:ed.
+ */
+int
+getvnode(fdp, fd, fpp)
+	struct filedesc *fdp;
+	struct file **fpp;
+	int fd;
+{
+	struct file *fp;
+
+	if ((fp = fd_getfile(fdp, fd)) == NULL)
+		return (EBADF);
+	if (fp->f_type != DTYPE_VNODE)
+		return (EINVAL);
+	FREF(fp);
+	*fpp = fp;
+
+	return (0);
+}
+
+/*
+ * Positional read system call.
+ */
+int
+sys_pread(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_pread_args /* {
+		syscallarg(int) fd;
+		syscallarg(void *) buf;
+		syscallarg(size_t) nbyte;
+		syscallarg(int) pad;
+		syscallarg(off_t) offset;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp;
+	struct vnode *vp;
+	off_t offset;
+	int fd = SCARG(uap, fd);
+
+	if ((fp = fd_getfile(fdp, fd)) == NULL)
+		return (EBADF);
+	if ((fp->f_flag & FREAD) == 0)
+		return (EBADF);
+
+	vp = (struct vnode *)fp->f_data;
+	if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
+		return (ESPIPE);
+	}
+
+	offset = SCARG(uap, offset);
+
+	FREF(fp);
+
+	/* dofileread() will FRELE the descriptor for us */
+	return (dofileread(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
+	    &offset, retval));
+}
+
+/*
+ * Positional scatter read system call.
+ */
+int
+sys_preadv(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_preadv_args /* {
+		syscallarg(int) fd;
+		syscallarg(const struct iovec *) iovp;
+		syscallarg(int) iovcnt;
+		syscallarg(int) pad;
+		syscallarg(off_t) offset;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp;
+	struct vnode *vp;
+	off_t offset;
+	int fd = SCARG(uap, fd);
+
+	if ((fp = fd_getfile(fdp, fd)) == NULL)
+		return (EBADF);
+	if ((fp->f_flag & FREAD) == 0)
+		return (EBADF);
+
+	vp = (struct vnode *)fp->f_data;
+	if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
+		return (ESPIPE);
+	}
+
+	FREF(fp);
+
+	offset = SCARG(uap, offset);
+
+	/* dofilereadv() will FRELE the descriptor for us */
+	return (dofilereadv(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
+	    &offset, retval));
+}
+
+/*
+ * Positional write system call.
+ */
+int
+sys_pwrite(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_pwrite_args /* {
+		syscallarg(int) fd;
+		syscallarg(const void *) buf;
+		syscallarg(size_t) nbyte;
+		syscallarg(int) pad;
+		syscallarg(off_t) offset;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp;
+	struct vnode *vp;
+	off_t offset;
+	int fd = SCARG(uap, fd);
+
+	if ((fp = fd_getfile(fdp, fd)) == NULL)
+		return (EBADF);
+	if ((fp->f_flag & FWRITE) == 0)
+		return (EBADF);
+
+	vp = (struct vnode *)fp->f_data;
+	if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
+		return (ESPIPE);
+	}
+
+	FREF(fp);
+
+	offset = SCARG(uap, offset);
+
+	/* dofilewrite() will FRELE the descriptor for us */
+	return (dofilewrite(p, fd, fp, SCARG(uap, buf), SCARG(uap, nbyte),
+	    &offset, retval));
+}
+
+
+/*
+ * Positional gather write system call.
+ */
+int
+sys_pwritev(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_pwritev_args /* {
+		syscallarg(int) fd;
+		syscallarg(const struct iovec *) iovp;
+		syscallarg(int) iovcnt;
+		syscallarg(int) pad;
+		syscallarg(off_t) offset;
+	} */ *uap = v;
+	struct filedesc *fdp = p->p_fd;
+	struct file *fp;
+	struct vnode *vp;
+	off_t offset;
+	int fd = SCARG(uap, fd);
+
+	if ((fp = fd_getfile(fdp, fd)) == NULL)
+		return (EBADF);
+	if ((fp->f_flag & FWRITE) == 0)
+		return (EBADF);
+
+	vp = (struct vnode *)fp->f_data;
+	if (fp->f_type != DTYPE_VNODE || vp->v_type == VFIFO) {
+		return (ESPIPE);
+	}
+
+	FREF(fp);
+
+	offset = SCARG(uap, offset);
+
+	/* dofilewritev() will FRELE the descriptor for us */
+	return (dofilewritev(p, fd, fp, SCARG(uap, iovp), SCARG(uap, iovcnt),
+	    &offset, retval));
+}
+
+#ifdef UFS_EXTATTR
+/*
+ * Syscall to push extended attribute configuration information into the
+ * VFS.  Accepts a path, which it converts to a mountpoint, as well as
+ * a command (int cmd), and attribute name and misc data.  For now, the
+ * attribute name is left in userspace for consumption by the VFS_op.
+ * It will probably be changed to be copied into sysspace by the
+ * syscall in the future, once issues with various consumers of the
+ * attribute code have raised their hands.
+ *
+ * Currently this is used only by UFS Extended Attributes.
+ */
+int
+sys_extattrctl(struct proc *p, void *v, register_t *reval)
+{
+	struct sys_extattrctl_args /* {
+		syscallarg(const char *) path;
+		syscallarg(int) cmd;
+		syscallarg(const char *) filename;
+		syscallarg(int) attrnamespace;
+		syscallarg(const char *) attrname;
+	} */ *uap = v;
+	struct vnode *filename_vp;
+	struct nameidata nd;
+	struct mount *mp;
+	char attrname[EXTATTR_MAXNAMELEN];
+	int error;
+
+	/*
+	 * SCARG(uap, attrname) not always defined.  We check again later
+	 * when we invoke the VFS call so as to pass in NULL there if needed.
+	 */
+	if (SCARG(uap, attrname) != NULL) {
+		error = copyinstr(SCARG(uap, attrname), attrname,
+		    EXTATTR_MAXNAMELEN, NULL);
+		if (error)
+			return (error);
+	}
+
+	/*
+	 * SCARG(uap, filename) not always defined.  If it is, grab
+	 * a vnode lock, which VFS_EXTATTRCTL() will later release.
+	 */
+	filename_vp = NULL;
+	if (SCARG(uap, filename) != NULL) {
+		NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
+		    SCARG(uap, filename), p);
+		if ((error = namei(&nd)) != 0)
+			return (error);
+		filename_vp = nd.ni_vp;
+	}
+
+	/* SCARG(uap, path) always defined. */
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0) {
+		if (filename_vp != NULL)
+			vput(filename_vp);
+		return (error);
+	}
+
+	mp = nd.ni_vp->v_mount;
+	if (error) {
+		if (filename_vp != NULL)
+			vput(filename_vp);
+		return (error);
+	}
+
+	if (SCARG(uap, attrname) != NULL) {
+		error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), filename_vp,
+		    SCARG(uap, attrnamespace), attrname, p);
+	} else {
+		error = VFS_EXTATTRCTL(mp, SCARG(uap, cmd), filename_vp,
+		    SCARG(uap, attrnamespace), NULL, p);
+	}
+
+	/*
+	 * VFS_EXTATTRCTL will have unlocked, but not de-ref'd,
+	 * filename_vp, so vrele it if it is defined.
+	 */
+	if (filename_vp != NULL)
+		vrele(filename_vp);
+
+	return (error);
+}
+
+/*-
+ * Set a named extended attribute on a file or directory
+ * 
+ * Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
+ *            kernelspace string pointer "attrname", userspace buffer
+ *            pointer "data", buffer length "nbytes", thread "td".
+ * Returns: 0 on success, an error number otherwise
+ * Locks: none
+ * References: vp must be a valid reference for the duration of the call
+ */
+static int
+extattr_set_vp(struct vnode *vp, int attrnamespace, const char *attrname,
+    void *data, size_t nbytes, struct proc *p, register_t *retval)
+{
+	struct uio auio;
+	struct iovec aiov;
+	ssize_t cnt;
+	int error;
+
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+
+	aiov.iov_base = data;
+	aiov.iov_len = nbytes;
+	auio.uio_iov = &aiov;
+	auio.uio_iovcnt = 1;
+	auio.uio_offset = 0;
+	if (nbytes > INT_MAX) {
+		error = EINVAL;
+		goto done;
+	}
+	auio.uio_resid = nbytes;
+	auio.uio_rw = UIO_WRITE;
+	auio.uio_segflg = UIO_USERSPACE;
+	auio.uio_procp = p;
+	cnt = nbytes;
+
+	error = VOP_SETEXTATTR(vp, attrnamespace, attrname, &auio,
+	    p->p_ucred, p);
+	cnt -= auio.uio_resid;
+	retval[0] = cnt;
+
+done:
+	VOP_UNLOCK(vp, 0, p);
+	return (error);
+}
+
+int
+sys_extattr_set_file(struct proc *p, void *v, register_t *retval)
+{
+	struct sys_extattr_set_file_args /* {
+		syscallarg(const char *) path;
+		syscallarg(int) attrnamespace;
+		syscallarg(const char *) attrname;
+		syscallarg(void *) data;
+		syscallarg(size_t) nbytes;
+	} */ *uap = v;
+	struct nameidata nd;
+	char attrname[EXTATTR_MAXNAMELEN];
+	int error;
+
+	error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
+	    NULL);
+	if (error)
+		return (error);
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+
+	error = extattr_set_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname,
+	    SCARG(uap, data), SCARG(uap, nbytes), p, retval);
+
+	vrele(nd.ni_vp);
+	return (error);
+}
+
+int
+sys_extattr_set_fd(struct proc *p, void *v, register_t *retval)
+{
+	struct sys_extattr_set_fd_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) attrnamespace;
+		syscallarg(const char *) attrname;
+		syscallarg(struct iovec *) iovp;
+		syscallarg(int) iovcnt;
+	} */ *uap = v;
+	struct file *fp;
+	char attrname[EXTATTR_MAXNAMELEN];
+	int error;
+
+	error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
+	    NULL);
+	if (error)
+		return (error);
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+
+	error = extattr_set_vp((struct vnode *)fp->f_data,
+	    SCARG(uap, attrnamespace), attrname, SCARG(uap, data),
+	    SCARG(uap, nbytes), p, retval);
+	FRELE(fp);
+
+	return (error);
+}
+
+/*-
+ * Get a named extended attribute on a file or directory
+ * 
+ * Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
+ *            kernelspace string pointer "attrname", userspace buffer
+ *            pointer "data", buffer length "nbytes", thread "td".
+ * Returns: 0 on success, an error number otherwise
+ * Locks: none
+ * References: vp must be a valid reference for the duration of the call
+ */
+static int
+extattr_get_vp(struct vnode *vp, int attrnamespace, const char *attrname,
+    void *data, size_t nbytes, struct proc *p, register_t *retval)
+{
+	struct uio auio;
+	struct iovec aiov;
+	ssize_t cnt;
+	size_t size;
+	int error;
+
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_READ);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+
+	/*
+	 * Slightly unusual semantics: if the user provides a NULL data
+	 * pointer, they don't want to receive the data, just the
+	 * maximum read length.
+	 */
+	if (data != NULL) {
+		aiov.iov_base = data;
+		aiov.iov_len = nbytes;
+		auio.uio_iov = &aiov;
+		auio.uio_offset = 0;
+		if (nbytes > INT_MAX) {
+			error = EINVAL;
+			goto done;
+		}
+		auio.uio_resid = nbytes;
+		auio.uio_rw = UIO_READ;
+		auio.uio_segflg = UIO_USERSPACE;
+		auio.uio_procp = p;
+		cnt = nbytes;
+		error = VOP_GETEXTATTR(vp, attrnamespace, attrname, &auio,
+		    NULL, p->p_ucred, p);
+		cnt -= auio.uio_resid;
+		retval[0] = cnt;
+	} else {
+		error = VOP_GETEXTATTR(vp, attrnamespace, attrname, NULL,
+		    &size, p->p_ucred, p);
+		retval[0] = size;
+	}
+done:
+	VOP_UNLOCK(vp, 0, p);
+	return (error);
+}
+
+int
+sys_extattr_get_file(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_extattr_get_file_args /* {
+		syscallarg(const char *) path;
+		syscallarg(int) attrnamespace;
+		syscallarg(const char *) attrname;
+		syscallarg(void *) data;
+		syscallarg(size_t) nbytes;
+	} */ *uap = v;
+	struct nameidata nd;
+	char attrname[EXTATTR_MAXNAMELEN];
+	int error;
+
+	error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
+	    NULL);
+	if (error)
+		return (error);
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return (error);
+
+	error = extattr_get_vp(nd.ni_vp, SCARG(uap, attrnamespace), attrname,
+	    SCARG(uap, data), SCARG(uap, nbytes), p, retval);
+
+	vrele(nd.ni_vp);
+	return (error);
+}
+
+int
+sys_extattr_get_fd(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_extattr_get_fd_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) attrnamespace;
+		syscallarg(const char *) attrname;
+		syscallarg(void *) data;
+		syscallarg(size_t) nbytes;
+	} */ *uap = v;
+	struct file *fp;
+	char attrname[EXTATTR_MAXNAMELEN];
+	int error;
+
+	error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
+	    NULL);
+	if (error)
+		return (error);
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+
+	error = extattr_get_vp((struct vnode *)fp->f_data,
+	    SCARG(uap, attrnamespace), attrname, SCARG(uap, data),
+	    SCARG(uap, nbytes), p, retval);
+	FRELE(fp);
+
+	return (error);
+}
+
+/*
+ * extattr_delete_vp(): Delete a named extended attribute on a file or
+ *                      directory
+ * 
+ * Arguments: unlocked vnode "vp", attribute namespace "attrnamespace",
+ *            kernelspace string pointer "attrname", proc "p"
+ * Returns: 0 on success, an error number otherwise
+ * Locks: none
+ * References: vp must be a valid reference for the duration of the call
+ */
+static int
+extattr_delete_vp(struct vnode *vp, int attrnamespace, const char *attrname,
+    struct proc *p)
+{
+	int error;
+
+	VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
+	vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
+
+	error = VOP_SETEXTATTR(vp, attrnamespace, attrname, NULL,
+	    p->p_ucred, p);
+
+	VOP_UNLOCK(vp, 0, p);
+	return (error);
+}
+
+int
+sys_extattr_delete_file(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_extattr_delete_file_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) attrnamespace;
+		syscallarg(const char *) attrname;
+	} */ *uap = v;
+	struct nameidata nd;
+	char attrname[EXTATTR_MAXNAMELEN];
+	int error;
+
+	error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
+	     NULL);
+	if (error)
+		return(error);
+
+	NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
+	if ((error = namei(&nd)) != 0)
+		return(error);
+
+	error = extattr_delete_vp(nd.ni_vp, SCARG(uap, attrnamespace),
+	    attrname, p);
+
+	vrele(nd.ni_vp);
+	return(error);
+}
+
+int
+sys_extattr_delete_fd(p, v, retval)
+	struct proc *p;
+	void *v;
+	register_t *retval;
+{
+	struct sys_extattr_delete_fd_args /* {
+		syscallarg(int) fd;
+		syscallarg(int) attrnamespace;
+		syscallarg(const char *) attrname;
+	} */ *uap = v; 
+	struct file *fp;
+	char attrname[EXTATTR_MAXNAMELEN];
+	int error;
+
+	error = copyinstr(SCARG(uap, attrname), attrname, EXTATTR_MAXNAMELEN,
+	    NULL);
+	if (error)
+		return (error);
+
+	if ((error = getvnode(p->p_fd, SCARG(uap, fd), &fp)) != 0)
+		return (error);
+
+	error = extattr_delete_vp((struct vnode *)fp->f_data,
+	    SCARG(uap, attrnamespace), attrname, p);
+	FRELE(fp);
+
+	return (error);
+}
+#endif