[apple/xnu.git] / bsd / vfs / vfs_syscalls.c

/*
 * Copyright (c) 1995-2001 Apple Computer, Inc. All rights reserved.
 *
 * @APPLE_LICENSE_HEADER_START@
 * 
 * The contents of this file constitute Original Code as defined in and
 * are subject to the Apple Public Source License Version 1.1 (the
 * "License").  You may not use this file except in compliance with the
 * License.  Please obtain a copy of the License at
 * http://www.apple.com/publicsource and read it before using this file.
 * 
 * This Original Code and all software distributed under the License are
 * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
 * License for the specific language governing rights and limitations
 * under the License.
 * 
 * @APPLE_LICENSE_HEADER_END@
 */
/*
 * 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. 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.
 *
 *      @(#)vfs_syscalls.c      8.41 (Berkeley) 6/15/95
 */

#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/attr.h>
#include <sys/sysctl.h>
#include <sys/ubc.h>
#include <machine/cons.h>
#include <miscfs/specfs/specdev.h>

struct lock__bsd__      exchangelock;

/*
 * The currently logged-in user, for ownership of files/directories whose on-disk
 * permissions are ignored:
 */
uid_t console_user;

static int change_dir __P((struct nameidata *ndp, struct proc *p));
static void checkdirs __P((struct vnode *olddp));

/* counts number of mount and unmount operations */
unsigned int vfs_nummntops=0;

/*
 * Virtual File System System Calls
 */

/*
 * Mount a file system.
 */
struct mount_args {
        char    *type;
        char    *path;
        int     flags;
        caddr_t data;
};
/* ARGSUSED */
int
mount(p, uap, retval)
        struct proc *p;
        register struct mount_args *uap;
        register_t *retval;
{
        struct vnode *vp;
        struct mount *mp;
        struct vfsconf *vfsp;
        int error, flag, err2;
        struct vattr va;
        u_long fstypenum;
        struct nameidata nd;
        char fstypename[MFSNAMELEN];
        size_t dummy=0;
        /*
         * Get vnode to be covered
         */
        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        
        if ((vp->v_flag & VROOT) &&
                (vp->v_mount->mnt_flag & MNT_ROOTFS)) 
                        uap->flags |= MNT_UPDATE;
        
        if (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 ((uap->flags & MNT_RELOAD) &&
                    ((mp->mnt_flag & MNT_RDONLY) == 0)) {
                        vput(vp);
                        return (EOPNOTSUPP);    /* Needs translation */
                }
                mp->mnt_flag |=
                    uap->flags & (MNT_RELOAD | MNT_FORCE | 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. FOr non-root
                 * users, silently enforce MNT_NOSUID and MNT_NODEV, and
                 * MNT_NOEXEC if mount point is already MNT_NOEXEC.
                 */
                if (p->p_ucred->cr_uid != 0) {
                        if (uap->flags & MNT_EXPORTED) {
                                vput(vp);
                                return (EPERM);
                        }
                        uap->flags |= MNT_NOSUID | MNT_NODEV;
                        if (flag & MNT_NOEXEC)
                                uap->flags |= MNT_NOEXEC;
                }
                if (vfs_busy(mp, LK_NOWAIT, 0, p)) {
                        vput(vp);
                        return (EBUSY);
                }
                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. FOr non-root
         * users, silently enforce MNT_NOSUID and MNT_NODEV, and
         * MNT_NOEXEC if mount point is already MNT_NOEXEC.
         */
        if (p->p_ucred->cr_uid != 0) {
                if (uap->flags & MNT_EXPORTED) {
                        vput(vp);
                        return (EPERM);
                }
                uap->flags |= MNT_NOSUID | MNT_NODEV;
                if (vp->v_mount->mnt_flag & MNT_NOEXEC)
                        uap->flags |= MNT_NOEXEC;
        }
        if (error = vinvalbuf(vp, V_SAVE, p->p_ucred, p, 0, 0)) {
                vput(vp);
                return (error);
        }
        if (vp->v_type != VDIR) {
                vput(vp);
                return (ENOTDIR);
        }
#if 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)uap->type;
        if (fstypenum < maxvfsconf) {
                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
#endif /* COMPAT_43 */
        if (error = copyinstr(uap->type, fstypename, MFSNAMELEN, &dummy)) {
                vput(vp);
                return (error);
        }
        for (vfsp = vfsconf; vfsp; vfsp = vfsp->vfc_next)
                if (!strcmp(vfsp->vfc_name, fstypename))
                        break;
        if (vfsp == NULL) {
                vput(vp);
                return (ENODEV);
        }
        simple_lock(&vp->v_interlock);
        if (ISSET(vp->v_flag, VMOUNT) && (vp->v_mountedhere != NULL)) {
                simple_unlock(&vp->v_interlock);
                vput(vp);
                return (EBUSY);
        }
        SET(vp->v_flag, VMOUNT);
        simple_unlock(&vp->v_interlock);

        /*
         * Allocate and initialize the filesystem.
         */
        mp = (struct mount *)_MALLOC_ZONE((u_long)sizeof(struct mount),
                M_MOUNT, M_WAITOK);
        bzero((char *)mp, (u_long)sizeof(struct mount));

        /* Initialize the default IO constraints */
        mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
        mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;

        lockinit(&mp->mnt_lock, PVFS, "vfslock", 0, 0);
        (void)vfs_busy(mp, LK_NOWAIT, 0, p);
        mp->mnt_op = vfsp->vfc_vfsops;
        mp->mnt_vfc = vfsp;
        vfsp->vfc_refcount++;
        mp->mnt_stat.f_type = vfsp->vfc_typenum;
        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;
        VOP_UNLOCK(vp, 0, p);

update:
        /*
         * Set the mount level flags.
         */
        if (uap->flags & MNT_RDONLY)
                mp->mnt_flag |= MNT_RDONLY;
        else if (mp->mnt_flag & MNT_RDONLY)
                mp->mnt_kern_flag |= MNTK_WANTRDWR;
        mp->mnt_flag &= ~(MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
                          MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
                          MNT_UNKNOWNPERMISSIONS | MNT_DONTBROWSE | MNT_AUTOMOUNTED);
        mp->mnt_flag |= uap->flags & (MNT_NOSUID | MNT_NOEXEC | MNT_NODEV |
                                      MNT_SYNCHRONOUS | MNT_UNION | MNT_ASYNC |
                                      MNT_UNKNOWNPERMISSIONS | MNT_DONTBROWSE | MNT_AUTOMOUNTED);
        /*
         * Mount the filesystem.
         */
        error = VFS_MOUNT(mp, uap->path, uap->data, &nd, p);
        if (mp->mnt_flag & MNT_UPDATE) {
                vrele(vp);
                if (mp->mnt_kern_flag & MNTK_WANTRDWR)
                        mp->mnt_flag &= ~MNT_RDONLY;
                mp->mnt_flag &=~
                    (MNT_UPDATE | MNT_RELOAD | MNT_FORCE);
                mp->mnt_kern_flag &=~ MNTK_WANTRDWR;
                if (error)
                        mp->mnt_flag = flag;
                vfs_unbusy(mp, p);
                return (error);
        }

        /* get the vnode lock */
        err2 = vn_lock(vp,  LK_EXCLUSIVE|LK_RETRY, p);

        /*
         * Put the new filesystem on the mount list after root.
         */
        cache_purge(vp);
        if (!error && !err2) {
                simple_lock(&vp->v_interlock);
                CLR(vp->v_flag, VMOUNT);
                vp->v_mountedhere =mp;
                simple_unlock(&vp->v_interlock);
                simple_lock(&mountlist_slock);
                CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
                simple_unlock(&mountlist_slock);
                checkdirs(vp);
                VOP_UNLOCK(vp, 0, p);
                vfs_unbusy(mp, p);
                if (error = VFS_START(mp, 0, p))
                        vrele(vp);

                /* increment the operations count */
                if (!error)
                        vfs_nummntops++;
        } else {
                simple_lock(&vp->v_interlock);
                CLR(vp->v_flag, VMOUNT);
                simple_unlock(&vp->v_interlock);
                mp->mnt_vfc->vfc_refcount--;
                vfs_unbusy(mp, p);
                _FREE_ZONE((caddr_t)mp, sizeof (struct mount), M_MOUNT);
                if (err2)
                        vrele(vp);
                else
                        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.
 */
static 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 = allproc.lh_first; p != 0; p = p->p_list.le_next) {
                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).
 */
struct unmount_args {
        char    *path;
        int     flags;
};
/* ARGSUSED */
int
unmount(p, uap, retval)
        struct proc *p;
        register struct unmount_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct mount *mp;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                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 (EBUSY); /* the root is always busy */
        }

        /*
         * Must be the root of the filesystem
         */
        if ((vp->v_flag & VROOT) == 0) {
                vput(vp);
                return (EINVAL);
        }
        vput(vp);
        return (dounmount(mp, uap->flags, p));
}

/*
 * Do the actual file system unmount.
 */
int
dounmount(mp, flags, p)
        register struct mount *mp;
        int flags;
        struct proc *p;
{
        struct vnode *coveredvp;
        int error;

        simple_lock(&mountlist_slock);
        mp->mnt_kern_flag |= MNTK_UNMOUNT;
        lockmgr(&mp->mnt_lock, LK_DRAIN | LK_INTERLOCK, &mountlist_slock, p);
        mp->mnt_flag &=~ MNT_ASYNC;
        ubc_umount(mp); /* release cached vnodes */
        cache_purgevfs(mp);     /* remove cache entries for this file sys */
        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) {
                mp->mnt_kern_flag &= ~MNTK_UNMOUNT;
                lockmgr(&mp->mnt_lock, LK_RELEASE | LK_INTERLOCK | LK_REENABLE,
                    &mountlist_slock, p);
                goto out;
        }

        /* increment the operations count */
        if (!error)
                vfs_nummntops++;
        CIRCLEQ_REMOVE(&mountlist, mp, mnt_list);
        if ((coveredvp = mp->mnt_vnodecovered) != NULLVP) {
                coveredvp->v_mountedhere = (struct mount *)0;
                simple_unlock(&mountlist_slock);
                vrele(coveredvp);
                simple_lock(&mountlist_slock);
        }
        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);
out:
        if (mp->mnt_kern_flag & MNTK_MWAIT)
                wakeup((caddr_t)mp);
        if (!error)
                _FREE_ZONE((caddr_t)mp, sizeof (struct mount), M_MOUNT);
        return (error);
}

/*
 * Sync each mounted filesystem.
 */
#if DIAGNOSTIC
int syncprt = 0;
struct ctldebug debug0 = { "syncprt", &syncprt };
#endif

struct sync_args {
        int     dummy;
};
int print_vmpage_stat=0;

/* ARGSUSED */
int
sync(p, uap, retval)
        struct proc *p;
        struct sync_args *uap;
        register_t *retval;
{
        register struct mount *mp, *nmp;
        int asyncflag;

        simple_lock(&mountlist_slock);
        for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
                if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
                        nmp = mp->mnt_list.cqe_next;
                        continue;
                }
                if ((mp->mnt_flag & MNT_RDONLY) == 0) {
                        asyncflag = mp->mnt_flag & MNT_ASYNC;
                        mp->mnt_flag &= ~MNT_ASYNC;
                        VFS_SYNC(mp, MNT_NOWAIT, p->p_ucred, p);
                        if (asyncflag)
                                mp->mnt_flag |= MNT_ASYNC;
                }
                simple_lock(&mountlist_slock);
                nmp = mp->mnt_list.cqe_next;
                vfs_unbusy(mp, p);
        }
        simple_unlock(&mountlist_slock);

        {
        extern void vm_countdirtypages(void);
        extern unsigned int vp_pagein, vp_pgodirty, vp_pgoclean;
        extern unsigned int dp_pgins, dp_pgouts;
        if(print_vmpage_stat) {
                vm_countdirtypages();
                printf("VP: %d: %d: %d: %d: %d\n", vp_pgodirty, vp_pgoclean, vp_pagein,
                        dp_pgins, dp_pgouts);
        }
        }
#if DIAGNOSTIC
        if (syncprt)
                vfs_bufstats();
#endif /* DIAGNOSTIC */
        return (0);
}

/*
 * Change filesystem quotas.
 */
struct quotactl_args {
        char *path;
        int cmd;
        int uid;
        caddr_t arg;
};
/* ARGSUSED */
int
quotactl(p, uap, retval)
        struct proc *p;
        register struct quotactl_args *uap;
        register_t *retval;
{
        register struct mount *mp;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        mp = nd.ni_vp->v_mount;
        vrele(nd.ni_vp);
        return (VFS_QUOTACTL(mp, uap->cmd, uap->uid,
            uap->arg, p));
}

/*
 * Get filesystem statistics.
 */
struct statfs_args {
        char *path;
        struct statfs *buf;
};
/* ARGSUSED */
int
statfs(p, uap, retval)
        struct proc *p;
        register struct statfs_args *uap;
        register_t *retval;
{
        register struct mount *mp;
        register struct statfs *sp;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        mp = nd.ni_vp->v_mount;
        sp = &mp->mnt_stat;
        vrele(nd.ni_vp);
        if (error = VFS_STATFS(mp, sp, p))
                return (error);
        sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
        return (copyout((caddr_t)sp, (caddr_t)uap->buf,
                sizeof(*sp)-sizeof(sp->f_reserved3)-sizeof(sp->f_reserved4)));
}

/*
 * Get filesystem statistics.
 */
struct fstatfs_args {
        int fd;
        struct statfs *buf;
};
/* ARGSUSED */
int
fstatfs(p, uap, retval)
        struct proc *p;
        register struct fstatfs_args *uap;
        register_t *retval;
{
        struct file *fp;
        struct mount *mp;
        register struct statfs *sp;
        int error;

        if (error = getvnode(p, uap->fd, &fp))
                return (error);
        mp = ((struct vnode *)fp->f_data)->v_mount;
        if (!mp)
                return (EBADF);
        sp = &mp->mnt_stat;
        if (error = VFS_STATFS(mp, sp, p))
                return (error);
        sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
        return (copyout((caddr_t)sp, (caddr_t)uap->buf,
                sizeof(*sp)-sizeof(sp->f_reserved3)-sizeof(sp->f_reserved4)));
}

/*
 * Get statistics on all filesystems.
 */
struct getfsstat_args {
        struct statfs *buf;
        long bufsize;
        int flags;
};
int
getfsstat(p, uap, retval)
        struct proc *p;
        register struct getfsstat_args *uap;
        register_t *retval;
{
        register struct mount *mp, *nmp;
        register struct statfs *sp;
        caddr_t sfsp;
        long count, maxcount, error;

        maxcount = uap->bufsize / sizeof(struct statfs);
        sfsp = (caddr_t)uap->buf;
        count = 0;
        simple_lock(&mountlist_slock);
        for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
                if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
                        nmp = mp->mnt_list.cqe_next;
                        continue;
                }
                if (sfsp && count < maxcount) {
                        sp = &mp->mnt_stat;
                        /*
                         * If MNT_NOWAIT is specified, do not refresh the
                         * fsstat cache. MNT_WAIT overrides MNT_NOWAIT.
                         */
                        if (((uap->flags & MNT_NOWAIT) == 0 ||
                            (uap->flags & MNT_WAIT)) &&
                            (error = VFS_STATFS(mp, sp, p))) {
                                simple_lock(&mountlist_slock);
                                nmp = mp->mnt_list.cqe_next;
                                vfs_unbusy(mp, p);
                                continue;
                        }
                        sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
                        if (error = copyout((caddr_t)sp, sfsp, sizeof(*sp)))
                                return (error);
                        sfsp += sizeof(*sp);
                }
                count++;
                simple_lock(&mountlist_slock);
                nmp = mp->mnt_list.cqe_next;
                vfs_unbusy(mp, p);
        }
        simple_unlock(&mountlist_slock);
        if (sfsp && count > maxcount)
                *retval = maxcount;
        else
                *retval = count;
        return (0);
}

#if COMPAT_GETFSSTAT
ogetfsstat(p, uap, retval)
        struct proc *p;
        register struct getfsstat_args *uap;
        register_t *retval;
{
        register struct mount *mp, *nmp;
        register struct statfs *sp;
        caddr_t sfsp;
        long count, maxcount, error;

        maxcount = uap->bufsize / (sizeof(struct statfs) - sizeof(sp->f_reserved4));
        sfsp = (caddr_t)uap->buf;
        count = 0;
        simple_lock(&mountlist_slock);
        for (mp = mountlist.cqh_first; mp != (void *)&mountlist; mp = nmp) {
                if (vfs_busy(mp, LK_NOWAIT, &mountlist_slock, p)) {
                        nmp = mp->mnt_list.cqe_next;
                        continue;
                }
                if (sfsp && count < maxcount) {
                        sp = &mp->mnt_stat;
                        /*
                         * If MNT_NOWAIT is specified, do not refresh the
                         * fsstat cache. MNT_WAIT overrides MNT_NOWAIT.
                         */
                        if (((uap->flags & MNT_NOWAIT) == 0 ||
                            (uap->flags & MNT_WAIT)) &&
                            (error = VFS_STATFS(mp, sp, p))) {
                                simple_lock(&mountlist_slock);
                                nmp = mp->mnt_list.cqe_next;
                                vfs_unbusy(mp, p);
                                continue;
                        }
                        sp->f_flags = mp->mnt_flag & MNT_VISFLAGMASK;
                        error = copyout((caddr_t)sp, sfsp,
                                        sizeof(*sp) - sizeof(sp->f_reserved3) - sizeof(sp->f_reserved4));
                        if (error)
                                return (error);
                        sfsp += sizeof(*sp) - sizeof(sp->f_reserved4);
                }
                count++;
                simple_lock(&mountlist_slock);
                nmp = mp->mnt_list.cqe_next;
                vfs_unbusy(mp, p);
        }
        simple_unlock(&mountlist_slock);
        if (sfsp && count > maxcount)
                *retval = maxcount;
        else
                *retval = count;
        return (0);
}
#endif

/*
 * Change current working directory to a given file descriptor.
 */
struct fchdir_args {
        int     fd;
};
/* ARGSUSED */
int
fchdir(p, uap, retval)
        struct proc *p;
        struct fchdir_args *uap;
        register_t *retval;
{
        register struct filedesc *fdp = p->p_fd;
        struct vnode *vp, *tdp;
        struct mount *mp;
        struct file *fp;
        int error;

        if (error = getvnode(p, uap->fd, &fp))
                return (error);
        vp = (struct vnode *)fp->f_data;
        VREF(vp);
        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 (``.'').
 */
struct chdir_args {
        char    *path;
};
/* ARGSUSED */
int
chdir(p, uap, retval)
        struct proc *p;
        struct chdir_args *uap;
        register_t *retval;
{
        register struct filedesc *fdp = p->p_fd;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = change_dir(&nd, p))
                return (error);
        vrele(fdp->fd_cdir);
        fdp->fd_cdir = nd.ni_vp;
        return (0);
}

/*
 * Change notion of root (``/'') directory.
 */
struct chroot_args {
        char    *path;
};
/* ARGSUSED */
int
chroot(p, uap, retval)
        struct proc *p;
        struct chroot_args *uap;
        register_t *retval;
{
        register struct filedesc *fdp = p->p_fd;
        int error;
        struct nameidata nd;

        if (error = suser(p->p_ucred, &p->p_acflag))
                return (error);

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = change_dir(&nd, p))
                return (error);

        if(error = clone_system_shared_regions()) {
                vrele(nd.ni_vp);
                return (error);
        }

        if (fdp->fd_rdir != NULL)
                vrele(fdp->fd_rdir);
        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))
                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.
 */
struct open_args {
        char    *path;
        int     flags;
        int     mode;
};
int
open(p, uap, retval)
        struct proc *p;
        register struct open_args *uap;
        register_t *retval;
{
        register struct filedesc *fdp = p->p_fd;
        register struct file *fp;
        register struct vnode *vp;
        int flags, cmode, oflags;
        struct file *nfp;
        int type, indx, error;
        struct flock lf;
        struct nameidata nd;
        extern struct fileops vnops;

        oflags = uap->flags;
        if ((oflags & O_ACCMODE) == O_ACCMODE)
                return(EINVAL);
        flags = FFLAGS(uap->flags);
        if (error = falloc(p, &nfp, &indx))
                return (error);
        fp = nfp;
        cmode = ((uap->mode &~ fdp->fd_cmask) & ALLPERMS) &~ S_ISTXT;
        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        p->p_dupfd = -indx - 1;                 /* XXX check for fdopen */
        if (error = vn_open(&nd, flags, cmode)) {
                ffree(fp);
                if ((error == ENODEV || error == ENXIO) &&
                    p->p_dupfd >= 0 &&                  /* XXX from fdopen */
                    (error =
                        dupfdopen(fdp, indx, p->p_dupfd, flags, error)) == 0) {
                        *retval = indx;
                        return (0);
                }
                if (error == ERESTART)
                        error = EINTR;
                fdrelse(p, indx);
                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);
                if (error = VOP_ADVLOCK(vp, (caddr_t)fp, F_SETLK, &lf, type)) {
                        (void) vn_close(vp, fp->f_flag, fp->f_cred, p);
                        ffree(fp);
                        fdrelse(p, indx);
                        return (error);
                }
                vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
                fp->f_flag |= FHASLOCK;
        }
        VOP_UNLOCK(vp, 0, p);
        *fdflags(p, indx) &= ~UF_RESERVED;
        *retval = indx;
        return (0);
}

#if COMPAT_43
/*
 * Create a file.
 */
struct ocreat_args {
        char    *path;
        int     mode;
};
int
ocreat(p, uap, retval)
        struct proc *p;
        register struct ocreat_args *uap;
        register_t *retval;
{
        struct open_args nuap;

        nuap.path = uap->path;
        nuap.mode = uap->mode;
        nuap.flags = O_WRONLY | O_CREAT | O_TRUNC;
        return (open(p, &nuap, retval));
}
#endif /* COMPAT_43 */

/*
 * Create a special file.
 */
struct mknod_args {
        char    *path;
        int     mode;
        int     dev;
};
/* ARGSUSED */
int
mknod(p, uap, retval)
        struct proc *p;
        register struct mknod_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct vattr vattr;
        int error;
        int whiteout;
        struct nameidata nd;

        if (error = suser(p->p_ucred, &p->p_acflag))
                return (error);
        NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        if (vp != NULL)
                error = EEXIST;
        else {
                VATTR_NULL(&vattr);
                vattr.va_mode = (uap->mode & ALLPERMS) &~ p->p_fd->fd_cmask;
                vattr.va_rdev = uap->dev;
                whiteout = 0;

                switch (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.
 */
struct mkfifo_args {
        char    *path;
        int     mode;
};
/* ARGSUSED */
int
mkfifo(p, uap, retval)
        struct proc *p;
        register struct mkfifo_args *uap;
        register_t *retval;
{
        struct vattr vattr;
        int error;
        struct nameidata nd;

#if !FIFO 
        return (EOPNOTSUPP);
#else
        NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                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 = (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.
 */
struct link_args {
        char    *path;
        char    *link;
};
/* ARGSUSED */
int
link(p, uap, retval)
        struct proc *p;
        register struct link_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct nameidata nd;
        int error;

        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        if (vp->v_type == VDIR)
                error = EPERM;   /* POSIX */
        else {
                nd.ni_cnd.cn_nameiop = CREATE;
                nd.ni_cnd.cn_flags = LOCKPARENT;
                nd.ni_dirp = uap->link;
                if ((error = namei(&nd)) == 0) {
                        if (nd.ni_vp != NULL)
                                error = EEXIST;
                        if (!error) {
                                VOP_LEASE(nd.ni_dvp, p, p->p_ucred,
                                    LEASE_WRITE);
                                VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
                                error = VOP_LINK(vp, nd.ni_dvp, &nd.ni_cnd);
                        } else {
                                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);
                        }
                }
        }
        vrele(vp);
        return (error);
}

/*
 * Make a symbolic link.
 */
struct symlink_args {
        char    *path;
        char    *link;
};
/* ARGSUSED */
int
symlink(p, uap, retval)
        struct proc *p;
        register struct symlink_args *uap;
        register_t *retval;
{
        struct vattr vattr;
        char *path;
        int error;
        struct nameidata nd;
        size_t dummy=0;
        MALLOC_ZONE(path, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
        if (error = copyinstr(uap->path, path, MAXPATHLEN, &dummy))
                goto out;
        NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->link, p);
        if (error = namei(&nd))
                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_ZONE(path, MAXPATHLEN, M_NAMEI);
        return (error);
}

/*
 * Delete a whiteout from the filesystem.
 */
struct undelete_args {
        char    *path;
};
/* ARGSUSED */
int
undelete(p, uap, retval)
        struct proc *p;
        register struct undelete_args *uap;
        register_t *retval;
{
        int error;
        struct nameidata nd;

        NDINIT(&nd, DELETE, LOCKPARENT|DOWHITEOUT, UIO_USERSPACE,
            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))
                VOP_ABORTOP(nd.ni_dvp, &nd.ni_cnd);
        vput(nd.ni_dvp);
        return (error);
}

/*
 * Delete a name from the filesystem.
 */
struct unlink_args {
        char    *path;
};
/* ARGSUSED */
static int
_unlink(p, uap, retval, nodelbusy)
        struct proc *p;
        struct unlink_args *uap;
        register_t *retval;
        int nodelbusy;
{
        register struct vnode *vp;
        int error;
        struct nameidata nd;

        NDINIT(&nd, DELETE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
        /* with Carbon semantics, busy files cannot be deleted */
        if (nodelbusy)
                nd.ni_cnd.cn_flags |= NODELETEBUSY;
        if (error = namei(&nd))
                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 = EPERM;  /* POSIX */
        else {
                /*
                 * The root of a mounted filesystem cannot be deleted.
                 *
                 * XXX: can this only be a VDIR case?
                 */
                if (vp->v_flag & VROOT)
                        error = EBUSY;
        }

        if (!error) {
                VOP_LEASE(nd.ni_dvp, p, p->p_ucred, LEASE_WRITE);
                error = VOP_REMOVE(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);
                if (vp != NULLVP)
                        vput(vp);
        }
        return (error);
}

/*
 * Delete a name from the filesystem using POSIX semantics.
 */
int
unlink(p, uap, retval)
        struct proc *p;
        struct unlink_args *uap;
        register_t *retval;
{
        return _unlink(p, uap, retval, 0);
}

/*
 * Delete a name from the filesystem using Carbon semantics.
 */
int
delete(p, uap, retval)
        struct proc *p;
        struct unlink_args *uap;
        register_t *retval;
{
        return _unlink(p, uap, retval, 1);
}

/*
 * Reposition read/write file offset.
 */
struct lseek_args {
        int     fd;
#ifdef DOUBLE_ALIGN_PARAMS
        int pad;
#endif
        off_t   offset;
        int     whence;
};
int
lseek(p, uap, retval)
        struct proc *p;
        register struct lseek_args *uap;
        register_t *retval;
{
        struct ucred *cred = p->p_ucred;
        struct file *fp;
        struct vattr vattr;
        int error;

        if (error = fdgetf(p, uap->fd, &fp))
                return (error);
        if (fp->f_type != DTYPE_VNODE)
                return (ESPIPE);
        switch (uap->whence) {
        case L_INCR:
                fp->f_offset += uap->offset;
                break;
        case L_XTND:
                if (error =
                    VOP_GETATTR((struct vnode *)fp->f_data, &vattr, cred, p))
                        return (error);
                fp->f_offset = uap->offset + vattr.va_size;
                break;
        case L_SET:
                fp->f_offset = uap->offset;
                break;
        default:
                return (EINVAL);
        }
        *(off_t *)retval = fp->f_offset;
        return (0);
}

#if COMPAT_43
/*
 * Reposition read/write file offset.
 */
struct olseek_args {
        int     fd;
        long    offset;
        int     whence;
};
int
olseek(p, uap, retval)
        struct proc *p;
        register struct olseek_args *uap;
        register_t *retval;
{
        struct lseek_args /* {
                syscallarg(int) fd;
#ifdef DOUBLE_ALIGN_PARAMS
        syscallarg(int) pad;
#endif
                syscallarg(off_t) offset;
                syscallarg(int) whence;
        } */ nuap;
        off_t qret;
        int error;

        nuap.fd = uap->fd;
        nuap.offset = uap->offset;
        nuap.whence = uap->whence;
        error = lseek(p, &nuap, &qret);
        *(long *)retval = qret;
        return (error);
}
#endif /* COMPAT_43 */

/*
 * Check access permissions.
 */
struct access_args {
        char    *path;
        int     flags;
};
int
access(p, uap, retval)
        struct proc *p;
        register struct access_args *uap;
        register_t *retval;
{
        register struct ucred *cred = p->p_ucred;
        register struct vnode *vp;
        int error, flags, t_gid, t_uid;
        struct nameidata nd;

        t_uid = cred->cr_uid;
        t_gid = cred->cr_groups[0];
        cred->cr_uid = p->p_cred->p_ruid;
        cred->cr_groups[0] = p->p_cred->p_rgid;
        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                goto out1;
        vp = nd.ni_vp;

        /* Flags == 0 means only check for existence. */
        if (uap->flags) {
                flags = 0;
                if (uap->flags & R_OK)
                        flags |= VREAD;
                if (uap->flags & W_OK)
                        flags |= VWRITE;
                if (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_groups[0] = t_gid;
        return (error);
}

#if COMPAT_43
/*
 * Get file status; this version follows links.
 */
struct ostat_args {
        char    *path;
        struct ostat *ub;
};
/* ARGSUSED */
int
ostat(p, uap, retval)
        struct proc *p;
        register struct ostat_args *uap;
        register_t *retval;
{
        struct stat sb;
        struct ostat osb;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        error = vn_stat(nd.ni_vp, &sb, p);
        vput(nd.ni_vp);
        if (error)
                return (error);
        cvtstat(&sb, &osb);
        error = copyout((caddr_t)&osb, (caddr_t)uap->ub, sizeof (osb));
        return (error);
}

/*
 * Get file status; this version does not follow links.
 */
struct olstat_args {
        char    *path;
        struct ostat *ub;
};
/* ARGSUSED */
int
olstat(p, uap, retval)
        struct proc *p;
        register struct olstat_args *uap;
        register_t *retval;
{
        struct vnode *vp, *dvp;
        struct stat sb, sb1;
        struct ostat osb;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        /*
         * For symbolic links, always return the attributes of its
         * containing directory, except for mode, size, and links.
         */
        vp = nd.ni_vp;
        dvp = nd.ni_dvp;
        if (vp->v_type != VLNK) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
                error = vn_stat(vp, &sb, p);
                vput(vp);
                if (error)
                        return (error);
        } else {
                error = vn_stat(dvp, &sb, p);
                vput(dvp);
                if (error) {
                        vput(vp);
                        return (error);
                }
                error = vn_stat(vp, &sb1, p);
                vput(vp);
                if (error)
                        return (error);
                sb.st_mode &= ~S_IFDIR;
                sb.st_mode |= S_IFLNK;
                sb.st_nlink = sb1.st_nlink;
                sb.st_size = sb1.st_size;
                sb.st_blocks = sb1.st_blocks;
        }
        cvtstat(&sb, &osb);
        error = copyout((caddr_t)&osb, (caddr_t)uap->ub, sizeof (osb));
        return (error);
}

/*
 * Convert from an old to a new stat structure.
 */
void
cvtstat(st, ost)
        struct stat *st;
        struct ostat *ost;
{

        ost->st_dev = st->st_dev;
        ost->st_ino = st->st_ino;
        ost->st_mode = st->st_mode;
        ost->st_nlink = st->st_nlink;
        ost->st_uid = st->st_uid;
        ost->st_gid = st->st_gid;
        ost->st_rdev = st->st_rdev;
        if (st->st_size < (quad_t)1 << 32)
                ost->st_size = st->st_size;
        else
                ost->st_size = -2;
        ost->st_atime = st->st_atime;
        ost->st_mtime = st->st_mtime;
        ost->st_ctime = st->st_ctime;
        ost->st_blksize = st->st_blksize;
        ost->st_blocks = st->st_blocks;
        ost->st_flags = st->st_flags;
        ost->st_gen = st->st_gen;
}
#endif /* COMPAT_43 */

/*
 * Get file status; this version follows links.
 */
struct stat_args {
        char    *path;
        struct stat *ub;
};
/* ARGSUSED */
int
stat(p, uap, retval)
        struct proc *p;
        register struct stat_args *uap;
        register_t *retval;
{
        struct stat sb;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        error = vn_stat(nd.ni_vp, &sb, p);
        vput(nd.ni_vp);
        if (error)
                return (error);
        error = copyout((caddr_t)&sb, (caddr_t)uap->ub, sizeof (sb));
        return (error);
}

/*
 * Get file status; this version does not follow links.
 */
struct lstat_args {
        char    *path;
        struct stat *ub;
};
/* ARGSUSED */
int
lstat(p, uap, retval)
        struct proc *p;
        register struct lstat_args *uap;
        register_t *retval;
{
        int error;
        struct vnode *vp, *dvp;
        struct stat sb, sb1;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF | LOCKPARENT, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        /*
         * For symbolic links, always return the attributes of its containing
         * directory, except for mode, size, inode number, and links.
         */
        vp = nd.ni_vp;
        dvp = nd.ni_dvp;
        if ((vp->v_type != VLNK) || ((vp->v_type == VLNK) && (vp->v_tag == VT_NFS))) {
                if (dvp == vp)
                        vrele(dvp);
                else
                        vput(dvp);
                error = vn_stat(vp, &sb, p);
                vput(vp);
                if (error)
                        return (error);
                if (vp->v_type == VLNK)
                sb.st_mode |= S_IFLNK;
        } else {
                error = vn_stat(dvp, &sb, p);
                vput(dvp);
                if (error) {
                        vput(vp);
                        return (error);
                }
                error = vn_stat(vp, &sb1, p);
                vput(vp);
                if (error)
                        return (error);
                sb.st_mode &= ~S_IFDIR;
                sb.st_mode |= S_IFLNK;
                sb.st_nlink = sb1.st_nlink;
                sb.st_size = sb1.st_size;
                sb.st_blocks = sb1.st_blocks;
                sb.st_ino = sb1.st_ino;
        }
        error = copyout((caddr_t)&sb, (caddr_t)uap->ub, sizeof (sb));
        return (error);
}

/*
 * Get configurable pathname variables.
 */
struct pathconf_args {
        char    *path;
        int     name;
};
/* ARGSUSED */
int
pathconf(p, uap, retval)
        struct proc *p;
        register struct pathconf_args *uap;
        register_t *retval;
{
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        error = VOP_PATHCONF(nd.ni_vp, uap->name, retval);
        vput(nd.ni_vp);
        return (error);
}

/*
 * Return target name of a symbolic link.
 */
struct readlink_args {
        char    *path;
        char    *buf;
        int     count;
};
/* ARGSUSED */
int
readlink(p, uap, retval)
        struct proc *p;
        register struct readlink_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct iovec aiov;
        struct uio auio;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, NOFOLLOW | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        if (vp->v_type != VLNK)
                error = EINVAL;
        else {
                aiov.iov_base = uap->buf;
                aiov.iov_len = 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 = uap->count;
                error = VOP_READLINK(vp, &auio, p->p_ucred);
        }
        vput(vp);
        *retval = uap->count - auio.uio_resid;
        return (error);
}

/*
 * Change flags of a file given a path name.
 */
struct chflags_args {
        char    *path;
        int     flags;
};
/* ARGSUSED */
int
chflags(p, uap, retval)
        struct proc *p;
        register struct chflags_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct vattr vattr;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        VATTR_NULL(&vattr);
        vattr.va_flags = uap->flags;
        error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
        vput(vp);
        return (error);
}

/*
 * Change flags of a file given a file descriptor.
 */
struct fchflags_args {
        int     fd;
        int     flags;
};
/* ARGSUSED */
int
fchflags(p, uap, retval)
        struct proc *p;
        register struct fchflags_args *uap;
        register_t *retval;
{
        struct vattr vattr;
        struct vnode *vp;
        struct file *fp;
        int error;

        if (error = getvnode(p, uap->fd, &fp))
                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);
        VATTR_NULL(&vattr);
        vattr.va_flags = uap->flags;
        error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
        VOP_UNLOCK(vp, 0, p);
        return (error);
}

/*
 * Change mode of a file given path name.
 */
struct chmod_args {
        char    *path;
        int     mode;
};
/* ARGSUSED */
int
chmod(p, uap, retval)
        struct proc *p;
        register struct chmod_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct vattr vattr;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        VATTR_NULL(&vattr);
        vattr.va_mode = 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.
 */
struct fchmod_args {
        int     fd;
        int     mode;
};
/* ARGSUSED */
int
fchmod(p, uap, retval)
        struct proc *p;
        register struct fchmod_args *uap;
        register_t *retval;
{
        struct vattr vattr;
        struct vnode *vp;
        struct file *fp;
        int error;

        if (error = getvnode(p, uap->fd, &fp))
                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);
        VATTR_NULL(&vattr);
        vattr.va_mode = uap->mode & ALLPERMS;
        error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
        VOP_UNLOCK(vp, 0, p);
        return (error);
}

/*
 * Set ownership given a path name.
 */
struct chown_args {
        char    *path;
        int     uid;
        int     gid;
};
/* ARGSUSED */
int
chown(p, uap, retval)
        struct proc *p;
        register struct chown_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct vattr vattr;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;

        /*
         * XXX A TEMPORARY HACK FOR NOW: Try to track console_user
         * by looking for chown() calls on /dev/console from a console process.
         */
        if ((vp) && (vp->v_specinfo) &&
                (major(vp->v_specinfo->si_rdev) == CONSMAJOR) &&
                (minor(vp->v_specinfo->si_rdev) == 0)) {
                console_user = uap->uid;
        };
        
        VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        VATTR_NULL(&vattr);
        vattr.va_uid = uap->uid;
        vattr.va_gid = uap->gid;
        error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
        vput(vp);
        return (error);
}

/*
 * Set ownership given a file descriptor.
 */
struct fchown_args {
        int     fd;
        int     uid;
        int     gid;
};
/* ARGSUSED */
int
fchown(p, uap, retval)
        struct proc *p;
        register struct fchown_args *uap;
        register_t *retval;
{
        struct vattr vattr;
        struct vnode *vp;
        struct file *fp;
        int error;

        if (error = getvnode(p, uap->fd, &fp))
                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);
        VATTR_NULL(&vattr);
        vattr.va_uid = uap->uid;
        vattr.va_gid = uap->gid;
        error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
        VOP_UNLOCK(vp, 0, p);
        return (error);
}

/*
 * Set the access and modification times of a file.
 */
struct utimes_args {
        char    *path;
        struct  timeval *tptr;
};
/* ARGSUSED */
int
utimes(p, uap, retval)
        struct proc *p;
        register struct utimes_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct timeval tv[2];
        struct vattr vattr;
        int error;
        struct nameidata nd;

        VATTR_NULL(&vattr);
        if (uap->tptr == NULL) {
                microtime(&tv[0]);
                tv[1] = tv[0];
                vattr.va_vaflags |= VA_UTIMES_NULL;
        } else if (error = copyin((caddr_t)uap->tptr, (caddr_t)tv,
            sizeof (tv)))
                return (error);
        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        VOP_LEASE(vp, p, p->p_ucred, LEASE_WRITE);
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        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);
}

/*
 * Truncate a file given its path name.
 */
struct truncate_args {
        char    *path;
#ifdef DOUBLE_ALIGN_PARAMS
        int     pad;
#endif
        off_t   length;
};
/* ARGSUSED */
int
truncate(p, uap, retval)
        struct proc *p;
        register struct truncate_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct vattr vattr;
        int error;
        struct nameidata nd;

        if (uap->length < 0)
                return(EINVAL);
        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                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 = uap->length;
                error = VOP_SETATTR(vp, &vattr, p->p_ucred, p);
        }
        vput(vp);
        return (error);
}

/*
 * Truncate a file given a file descriptor.
 */
struct ftruncate_args {
        int     fd;
#ifdef DOUBLE_ALIGN_PARAMS
        int     pad;
#endif
        off_t   length;
};
/* ARGSUSED */
int
ftruncate(p, uap, retval)
        struct proc *p;
        register struct ftruncate_args *uap;
        register_t *retval;
{
        struct vattr vattr;
        struct vnode *vp;
        struct file *fp;
        int error;

        if (uap->length < 0)
                return(EINVAL);
        
        if (error = fdgetf(p, uap->fd, &fp))
                return (error);

        if (fp->f_type == DTYPE_PSXSHM) {
                return(pshm_truncate(p, fp, uap->fd, uap->length, retval));
        }
        if (fp->f_type != DTYPE_VNODE) 
                return (EINVAL);

        if ((fp->f_flag & FWRITE) == 0)
                return (EINVAL);
        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 = uap->length;
                error = VOP_SETATTR(vp, &vattr, fp->f_cred, p);
        }
        VOP_UNLOCK(vp, 0, p);
        return (error);
}

#if COMPAT_43
/*
 * Truncate a file given its path name.
 */
struct otruncate_args {
        char    *path;
        long    length;
};
/* ARGSUSED */
int
otruncate(p, uap, retval)
        struct proc *p;
        register struct otruncate_args *uap;
        register_t *retval;
{
        struct truncate_args /* {
                syscallarg(char *) path;
#ifdef DOUBLE_ALIGN_PARAMS
                syscallarg(int) pad;
#endif
                syscallarg(off_t) length;
        } */ nuap;

        nuap.path = uap->path;
        nuap.length = uap->length;
        return (truncate(p, &nuap, retval));
}

/*
 * Truncate a file given a file descriptor.
 */
struct oftruncate_args {
        int     fd;
        long    length;
};
/* ARGSUSED */
int
oftruncate(p, uap, retval)
        struct proc *p;
        register struct oftruncate_args *uap;
        register_t *retval;
{
        struct ftruncate_args /* {
                syscallarg(int) fd;
#ifdef DOUBLE_ALIGN_PARAMS
                syscallarg(int) pad;
#endif
                syscallarg(off_t) length;
        } */ nuap;

        nuap.fd = uap->fd;
        nuap.length = uap->length;
        return (ftruncate(p, &nuap, retval));
}
#endif /* COMPAT_43 */

/*
 * Sync an open file.
 */
struct fsync_args {
        int     fd;
};
/* ARGSUSED */
int
fsync(p, uap, retval)
        struct proc *p;
        struct fsync_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct file *fp;
        int error;

        if (error = getvnode(p, uap->fd, &fp))
                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);
        VOP_UNLOCK(vp, 0, p);
        return (error);
}

/*
 * Duplicate files.  Source must be a file, target must be a file or 
 * must not exist.
 */

struct copyfile_args {
        char    *from;
        char    *to;
        int     mode;
        int     flags;
};
/* ARGSUSED */
int
copyfile(p, uap, retval)
        struct proc *p;
        register struct copyfile_args *uap;
        register_t *retval;
{
        register struct vnode *tvp, *fvp, *tdvp;
        register struct ucred *cred = p->p_ucred;
        struct nameidata fromnd, tond;
        int error;
        
        /* Check that the flags are valid.  
         */

        if (uap->flags & ~CPF_MASK) {
           return(EINVAL);
        }

        NDINIT(&fromnd, LOOKUP, SAVESTART, UIO_USERSPACE,
            uap->from, p);
        if (error = namei(&fromnd))
                return (error);
        fvp = fromnd.ni_vp;

        NDINIT(&tond, CREATE,  LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART,
            UIO_USERSPACE, uap->to, p);
        if (error = namei(&tond)) {
                vrele(fvp);
                goto out1;
        }
        tdvp = tond.ni_dvp;
        tvp = tond.ni_vp;
        if (tvp != NULL) {
                if (!(uap->flags & CPF_OVERWRITE)) {
                        error = EEXIST;
                        goto out;
                }
        }

        if (fvp->v_type == VDIR || (tvp && tvp->v_type == VDIR)) {
                error = EISDIR;
                goto out;
        }

        if (error = VOP_ACCESS(tdvp, VWRITE, cred, p))  
                goto out;

        if (fvp == tdvp)
                error = EINVAL;
        /*
         * If source is the same as the destination (that is the
         * same inode number) then there is nothing to do.
         * (fixed to have POSIX semantics - CSM 3/2/98)
         */
        if (fvp == tvp)
                error = -1;
out:
        if (!error) {
                error = VOP_COPYFILE(fvp,tdvp,tvp,&tond.ni_cnd,uap->mode,uap->flags);
        } else {
                VOP_ABORTOP(tdvp, &tond.ni_cnd);
                if (tdvp == tvp)
                        vrele(tdvp);
                else
                        vput(tdvp);
                if (tvp)
                        vput(tvp);
                vrele(fvp);
        }
        vrele(tond.ni_startdir);
        FREE_ZONE(tond.ni_cnd.cn_pnbuf, tond.ni_cnd.cn_pnlen, M_NAMEI);
out1:
        if (fromnd.ni_startdir)
                vrele(fromnd.ni_startdir);
        FREE_ZONE(fromnd.ni_cnd.cn_pnbuf, fromnd.ni_cnd.cn_pnlen, M_NAMEI);
        if (error == -1)
                return (0);
        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.
 */
struct rename_args {
        char    *from;
        char    *to;
};
/* ARGSUSED */
int
rename(p, uap, retval)
        struct proc *p;
        register struct rename_args *uap;
        register_t *retval;
{
        register struct vnode *tvp, *fvp, *tdvp;
        struct nameidata fromnd, tond;
        int error;
        int mntrename;
        int casesense,casepres;

        mntrename = FALSE;

        NDINIT(&fromnd, DELETE, WANTPARENT | SAVESTART, UIO_USERSPACE,
            uap->from, p);
        if (error = namei(&fromnd))
                return (error);
        fvp = fromnd.ni_vp;

        NDINIT(&tond, RENAME, LOCKPARENT | LOCKLEAF | NOCACHE | SAVESTART,
            UIO_USERSPACE, uap->to, p);
        if (error = namei(&tond)) {
                VOP_ABORTOP(fromnd.ni_dvp, &fromnd.ni_cnd);
                vrele(fromnd.ni_dvp);
                vrele(fvp);
                goto out2;
        }
        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) then there is nothing to do...
         * EXCEPT if the
         * underlyning file system supports case insensitivity and is case preserving. Then
         * a special case is made, i.e. foo -> Foo.
         *
         * Only file systems that support the pathconf selectors _PC_CASE_SENSITIVE and
         * _PC_CASE_PRESERVING can have this exception, and then they would need to
         * handle the special case of getting the same vnode as target and source.
         * NOTE: Then the target is unlocked going into VOP_RENAME, so not to cause
         * locking problems. There is a single reference on tvp.
         */
        if (fvp == tvp) {
                error = -1;
                /* 
                 * Check to see if just changing case, if: 
                 *  - file system is case insensitive
                 *  - and also case preserving
                 *  _ same parent directories (so changing case by different links is not supported)
                 *  For instance: mv a/foo a/Foo
                 */
        if ((tond.ni_dvp == fromnd.ni_dvp) &&
                                (VOP_PATHCONF(tdvp, _PC_CASE_SENSITIVE, &casesense) == 0) &&
                (VOP_PATHCONF(tdvp, _PC_CASE_PRESERVING, &casepres) == 0) &&
                (casesense == 0) && 
                (casepres == 1)) {
            /* Since the target is locked...unlock it and lose a ref */
            vput(tvp);
                    error = 0;
        }
        }
        
        /*
         * Allow the renaming of mount points.
         * - target must not exist
         * - target must reside in the same directory as source
         * - union mounts cannot be renamed
         * - "/" cannot be renamed
         */
        if ((fvp->v_flag & VROOT)  &&
            (fvp->v_type == VDIR) &&
            (tvp == NULL)  &&
            (fvp->v_mountedhere == NULL)  &&
            (fromnd.ni_dvp == tond.ni_dvp)  &&
            ((fvp->v_mount->mnt_flag & (MNT_UNION | MNT_ROOTFS)) == 0)  &&
            (fvp->v_mount->mnt_vnodecovered != NULLVP)) {
        
                /* switch fvp to the covered vnode */
                fromnd.ni_vp = fvp->v_mount->mnt_vnodecovered;
                vrele(fvp);
                fvp = fromnd.ni_vp;
                VREF(fvp);
                mntrename = TRUE;
        }
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)
                        VOP_LEASE(tvp, p, p->p_ucred, LEASE_WRITE);
                error = VOP_RENAME(fromnd.ni_dvp, fvp, &fromnd.ni_cnd,
                                   tond.ni_dvp, tvp, &tond.ni_cnd);
                if (error)
                        goto out1;
                
                /*
                 * update filesystem's mount point data
                 */
                if (mntrename) {
                        char *cp, *pathend, *mpname;
                        char * tobuf;
                        struct mount *mp;
                        int maxlen;
                        size_t len = 0;

                        VREF(fvp);
                        vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, p);
                        mp = fvp->v_mountedhere;

                        if (vfs_busy(mp, LK_NOWAIT, 0, p)) {
                                vput(fvp);
                                error = EBUSY;
                                goto out1;
                        }
                        VOP_UNLOCK(fvp, 0, p);
                        
                        MALLOC_ZONE(tobuf, char *, MAXPATHLEN, M_NAMEI, M_WAITOK);
                        error = copyinstr(uap->to, tobuf, MAXPATHLEN, &len);
                        if (!error) {
                                /* find current mount point prefix */
                                pathend = &mp->mnt_stat.f_mntonname[0];
                                for (cp = pathend; *cp != '\0'; ++cp) {
                                        if (*cp == '/')
                                                pathend = cp + 1;
                                }
                                /* find last component of target name */
                                for (mpname = cp = tobuf; *cp != '\0'; ++cp) {
                                        if (*cp == '/')
                                                mpname = cp + 1;
                                }
                                /* append name to prefix */
                                maxlen = MNAMELEN - (pathend - mp->mnt_stat.f_mntonname);
                                bzero(pathend, maxlen);
                                strncpy(pathend, mpname, maxlen - 1);
                        }
                        FREE_ZONE(tobuf, MAXPATHLEN, M_NAMEI);

                        vrele(fvp);
                        vfs_unbusy(mp, p);
                }
        } 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);
        }
out1:
        vrele(tond.ni_startdir);
        FREE_ZONE(tond.ni_cnd.cn_pnbuf, tond.ni_cnd.cn_pnlen, M_NAMEI);
out2:
        if (fromnd.ni_startdir)
                vrele(fromnd.ni_startdir);
        FREE_ZONE(fromnd.ni_cnd.cn_pnbuf, fromnd.ni_cnd.cn_pnlen, M_NAMEI);
        if (error == -1)
                return (0);
        return (error);
}

/*
 * Make a directory file.
 */
struct mkdir_args {
        char    *path;
        int     mode;
};
/* ARGSUSED */
int
mkdir(p, uap, retval)
        struct proc *p;
        register struct mkdir_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct vattr vattr;
        int error;
        struct nameidata nd;

        NDINIT(&nd, CREATE, LOCKPARENT, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                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 = (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.
 */
struct rmdir_args {
        char    *path;
};
/* ARGSUSED */
int
rmdir(p, uap, retval)
        struct proc *p;
        struct rmdir_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        int error;
        struct nameidata nd;

        NDINIT(&nd, DELETE, LOCKPARENT | LOCKLEAF, UIO_USERSPACE,
            uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        if (vp->v_type != VDIR) {
                error = ENOTDIR;
                goto out;
        }
        /*
         * No rmdir "." please.
         */
        if (nd.ni_dvp == vp) {
                error = EINVAL;
                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);
}

#if COMPAT_43
/*
 * Read a block of directory entries in a file system independent format.
 */
struct ogetdirentries_args {
        int     fd;
        char    *buf;
        u_int   count;
        long    *basep;
};
int
ogetdirentries(p, uap, retval)
        struct proc *p;
        register struct ogetdirentries_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct file *fp;
        struct uio auio, kuio;
        struct iovec aiov, kiov;
        struct dirent *dp, *edp;
        caddr_t dirbuf;
        int error, eofflag, readcnt;
        long loff;

        if (error = getvnode(p, uap->fd, &fp))
                return (error);
        if ((fp->f_flag & FREAD) == 0)
                return (EBADF);
        vp = (struct vnode *)fp->f_data;
unionread:
        if (vp->v_type != VDIR)
                return (EINVAL);
        aiov.iov_base = uap->buf;
        aiov.iov_len = 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 = uap->count;
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        loff = auio.uio_offset = fp->f_offset;
#       if (BYTE_ORDER != LITTLE_ENDIAN)
                if (vp->v_mount->mnt_maxsymlinklen <= 0) {
                        error = VOP_READDIR(vp, &auio, fp->f_cred, &eofflag,
                            (int *)0, (u_long *)0);
                        fp->f_offset = auio.uio_offset;
                } else
#       endif
        {
                kuio = auio;
                kuio.uio_iov = &kiov;
                kuio.uio_segflg = UIO_SYSSPACE;
                kiov.iov_len = uap->count;
                MALLOC(dirbuf, caddr_t, uap->count, M_TEMP, M_WAITOK);
                kiov.iov_base = dirbuf;
                error = VOP_READDIR(vp, &kuio, fp->f_cred, &eofflag,
                            (int *)0, (u_long *)0);
                fp->f_offset = kuio.uio_offset;
                if (error == 0) {
                        readcnt = uap->count - kuio.uio_resid;
                        edp = (struct dirent *)&dirbuf[readcnt];
                        for (dp = (struct dirent *)dirbuf; dp < edp; ) {
#                               if (BYTE_ORDER == LITTLE_ENDIAN)
                                        /*
                                         * The expected low byte of
                                         * dp->d_namlen is our dp->d_type.
                                         * The high MBZ byte of dp->d_namlen
                                         * is our dp->d_namlen.
                                         */
                                        dp->d_type = dp->d_namlen;
                                        dp->d_namlen = 0;
#                               else
                                        /*
                                         * The dp->d_type is the high byte
                                         * of the expected dp->d_namlen,
                                         * so must be zero'ed.
                                         */
                                        dp->d_type = 0;
#                               endif
                                if (dp->d_reclen > 0) {
                                        dp = (struct dirent *)
                                            ((char *)dp + dp->d_reclen);
                                } else {
                                        error = EIO;
                                        break;
                                }
                        }
                        if (dp >= edp)
                                error = uiomove(dirbuf, readcnt, &auio);
                }
                FREE(dirbuf, M_TEMP);
        }
        VOP_UNLOCK(vp, 0, p);
        if (error)
                return (error);

#if UNION
{
        extern int (**union_vnodeop_p)(void *);
        extern struct vnode *union_dircache __P((struct vnode*, struct proc*));

        if ((uap->count == auio.uio_resid) &&
            (vp->v_op == union_vnodeop_p)) {
                struct vnode *lvp;

                lvp = union_dircache(vp, p);
                if (lvp != NULLVP) {
                        struct vattr va;

                        /*
                         * If the directory is opaque,
                         * then don't show lower entries
                         */
                        error = VOP_GETATTR(vp, &va, fp->f_cred, p);
                        if (va.va_flags & OPAQUE) {
                                vput(lvp);
                                lvp = NULL;
                        }
                }
                
                if (lvp != NULLVP) {
                        error = VOP_OPEN(lvp, FREAD, fp->f_cred, p);
                        if (error) {
                                vput(lvp);
                                return (error);
                        }
                        VOP_UNLOCK(lvp, 0, p);
                        fp->f_data = (caddr_t) lvp;
                        fp->f_offset = 0;
                        error = VOP_CLOSE(vp, FREAD, fp->f_cred, p);
                        vrele(vp);
                        if (error)
                                return (error);
                        vp = lvp;
                        goto unionread;
                }
        }
}
#endif /* UNION */

        if ((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)uap->basep,
            sizeof(long));
        *retval = uap->count - auio.uio_resid;
        return (error);
}
#endif /* COMPAT_43 */

/*
 * Read a block of directory entries in a file system independent format.
 */
struct getdirentries_args {
        int     fd;
        char    *buf;
        u_int   count;
        long    *basep;
};
int
getdirentries(p, uap, retval)
        struct proc *p;
        register struct getdirentries_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct file *fp;
        struct uio auio;
        struct iovec aiov;
        long loff;
        int error, eofflag;

        if (error = getvnode(p, uap->fd, &fp))
                return (error);
        if ((fp->f_flag & FREAD) == 0)
                return (EBADF);
        vp = (struct vnode *)fp->f_data;
unionread:
        if (vp->v_type != VDIR)
                return (EINVAL);
        aiov.iov_base = uap->buf;
        aiov.iov_len = 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 = 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,
                            (int *)0, (u_long *)0);
        fp->f_offset = auio.uio_offset;
        VOP_UNLOCK(vp, 0, p);
        if (error)
                return (error);

#if UNION
{
        extern int (**union_vnodeop_p)(void *);
        extern struct vnode *union_dircache __P((struct vnode*, struct proc*));

        if ((uap->count == auio.uio_resid) &&
            (vp->v_op == union_vnodeop_p)) {
                struct vnode *lvp;

                lvp = union_dircache(vp, p);
                if (lvp != NULLVP) {
                        struct vattr va;

                        /*
                         * If the directory is opaque,
                         * then don't show lower entries
                         */
                        error = VOP_GETATTR(vp, &va, fp->f_cred, p);
                        if (va.va_flags & OPAQUE) {
                                vput(lvp);
                                lvp = NULL;
                        }
                }

                if (lvp != NULLVP) {
                        error = VOP_OPEN(lvp, FREAD, fp->f_cred, p);
                        if (error) {
                                vput(lvp);
                                return (error);
                        }
                        VOP_UNLOCK(lvp, 0, p);
                        fp->f_data = (caddr_t) lvp;
                        fp->f_offset = 0;
                        error = VOP_CLOSE(vp, FREAD, fp->f_cred, p);
                        vrele(vp);
                        if (error)
                                return (error);
                        vp = lvp;
                        goto unionread;
                }
        }
}
#endif /* UNION */

        if ((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)uap->basep,
            sizeof(long));
        *retval = uap->count - auio.uio_resid;
        return (error);
}

/*
 * Set the mode mask for creation of filesystem nodes.
 */
struct umask_args {
        int     newmask;
};
int
umask(p, uap, retval)
        struct proc *p;
        struct umask_args *uap;
        register_t *retval;
{
        register struct filedesc *fdp;

        fdp = p->p_fd;
        *retval = fdp->fd_cmask;
        fdp->fd_cmask = uap->newmask & ALLPERMS;
        return (0);
}

/*
 * Void all references to file by ripping underlying filesystem
 * away from vnode.
 */
struct revoke_args {
        char    *path;
};
/* ARGSUSED */
int
revoke(p, uap, retval)
        struct proc *p;
        register struct revoke_args *uap;
        register_t *retval;
{
        register struct vnode *vp;
        struct vattr vattr;
        int error;
        struct nameidata nd;

        NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->path, p);
        if (error = namei(&nd))
                return (error);
        vp = nd.ni_vp;
        if (error = VOP_GETATTR(vp, &vattr, p->p_ucred, p))
                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))
                VOP_REVOKE(vp, REVOKEALL);
out:
        vrele(vp);
        return (error);
}

/*
 * Convert a user file descriptor to a kernel file entry.
 */
int
getvnode(p, fd, fpp)
        struct proc *p;
        int fd;
        struct file **fpp;
{
        struct file *fp;
        int error;

        if (error = fdgetf(p, fd, &fp))
                return (error);
        if (fp->f_type != DTYPE_VNODE)
                return (EINVAL);
        *fpp = fp;
        return (0);
}

/*
 *  HFS/HFS PlUS SPECIFIC SYSTEM CALLS
 *  The following 10 system calls are designed to support features
 *  which are specific to the HFS & HFS Plus volume formats
 */


/*
 * Make a complex file.  A complex file is one with multiple forks (data streams)
 */
struct mkcomplex_args {
        const char *path;       /* pathname of the file to be created */
        mode_t mode;            /* access mode for the newly created file */
        u_long type;            /* format of the complex file */
};
/* ARGSUSED */
int
mkcomplex(p,uap,retval)
        struct proc *p;
        register struct mkcomplex_args *uap;
        register_t *retval;
                        
{
        struct vnode *vp;
        struct vattr vattr;
        int error;
        struct nameidata nd;

        /* mkcomplex wants the directory vnode locked so do that here */

        NDINIT(&nd, CREATE, FOLLOW | LOCKPARENT, UIO_USERSPACE, (char *)uap->path, p);
        if (error = namei(&nd))
                return (error);

        /*  Set the attributes as specified by the user */

        VATTR_NULL(&vattr);
        vattr.va_mode = (uap->mode & ACCESSPERMS);
        error = VOP_MKCOMPLEX(nd.ni_dvp, &vp, &nd.ni_cnd, &vattr, uap->type);

        /*  The mkcomplex call promises to release the parent vnode pointer
         *  even an an error case so don't do it here unless the operation
         *  is not supported.  In that case, there isn't anyone to unlock the parent
         *  The vnode pointer to the file will also be released.
         */

        if (error)
                {
                if (error == EOPNOTSUPP)
                        vput(nd.ni_dvp);
                return (error);
                }

        return (0);

} /* end of mkcomplex system call */



/*
 * Extended stat call which returns volumeid and vnodeid as well as other info
 */
struct statv_args {
        const char *path;       /* pathname of the target file       */
        struct vstat *vsb;      /* vstat structure for returned info */
};
/* ARGSUSED */
int
statv(p,uap,retval)
        struct proc *p;
        register struct statv_args *uap;
        register_t *retval;

{
        return (EOPNOTSUPP);    /*  We'll just return an error for now */

} /* end of statv system call */



/*
* Extended lstat call which returns volumeid and vnodeid as well as other info
*/
struct lstatv_args {
       const char *path;        /* pathname of the target file       */
       struct vstat *vsb;       /* vstat structure for returned info */
};
/* ARGSUSED */
int
lstatv(p,uap,retval)
       struct proc *p;
       register struct lstatv_args *uap;
       register_t *retval;

{
       return (EOPNOTSUPP);     /*  We'll just return an error for now */
} /* end of lstatv system call */



/*
* Extended fstat call which returns volumeid and vnodeid as well as other info
*/
struct fstatv_args {
       int fd;                  /* file descriptor of the target file */
       struct vstat *vsb;       /* vstat structure for returned info  */
};
/* ARGSUSED */
int
fstatv(p,uap,retval)
       struct proc *p;
       register struct fstatv_args *uap;
       register_t *retval;

{
       return (EOPNOTSUPP);     /*  We'll just return an error for now */
} /* end of fstatv system call */



/*
* Obtain attribute information about a file system object
*/

struct getattrlist_args {
       const char *path;        /* pathname of the target object */
       struct attrlist * alist; /* Attributes desired by the user */
       void * attributeBuffer;  /* buffer to hold returned attributes */
       size_t bufferSize;       /* size of the return buffer */
       unsigned long options;   /* options (follow/don't follow) */
};
/* ARGSUSED */
int
getattrlist (p,uap,retval)
       struct proc *p;
       register struct getattrlist_args *uap;
       register_t *retval;

{
        int error;
        struct nameidata nd;    
        struct iovec aiov;
        struct uio auio;
        struct attrlist attributelist;
        u_long nameiflags;

        /* Get the attributes desire and do our parameter checking */

        if (error = copyin((caddr_t)uap->alist, (caddr_t) &attributelist,
                 sizeof (attributelist)))
                {
                return(error);
                }

        if (attributelist.bitmapcount != ATTR_BIT_MAP_COUNT
#if 0
            ||  attributelist.commonattr & ~ATTR_CMN_VALIDMASK ||
                attributelist.volattr & ~ATTR_VOL_VALIDMASK ||
                attributelist.dirattr & ~ATTR_DIR_VALIDMASK ||
                attributelist.fileattr & ~ATTR_FILE_VALIDMASK ||
                attributelist.forkattr & ~ATTR_FORK_VALIDMASK
#endif
        )
                {
                return (EINVAL);
                }

        /* Get the vnode for the file we are getting info on.  */
        nameiflags = LOCKLEAF;
        if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
        NDINIT(&nd, LOOKUP, nameiflags, UIO_USERSPACE, (char *)uap->path, p);

        if (error = namei(&nd))
                return (error);

        /* Set up the UIO structure for use by the vfs routine */

        
        aiov.iov_base = uap->attributeBuffer;
        aiov.iov_len = uap->bufferSize;  
        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 = uap->bufferSize;


        error = VOP_GETATTRLIST(nd.ni_vp, &attributelist, &auio, p->p_ucred, p);

        /* Unlock and release the vnode which will have been locked by namei */

        vput(nd.ni_vp);

        /* return the effort if we got one, otherwise return success */

        if (error)
            {
            return (error);
            }

        return(0);

} /* end of getattrlist system call */



/*
 * Set attribute information about a file system object
 */

struct setattrlist_args {
      const char *path;         /* pathname of the target object          */
      struct attrlist * alist;  /* Attributes being set  by the user      */
      void * attributeBuffer;   /* buffer with attribute values to be set */
      size_t bufferSize;        /* size of the return buffer              */
      unsigned long options;    /* options (follow/don't follow) */
};
/* ARGSUSED */
int
setattrlist (p,uap,retval)
      struct proc *p;
      register struct setattrlist_args *uap;
      register_t *retval;

{
        int error;
        struct nameidata nd;    
        struct iovec aiov;
        struct uio auio;
        struct attrlist alist;
        u_long nameiflags;

       /* Get the attributes desired and do our parameter checking */

        if ((error = copyin((caddr_t)uap->alist, (caddr_t) &alist,
            sizeof (alist)))) {
                return (error);
        }

        if (alist.bitmapcount != ATTR_BIT_MAP_COUNT)
                return (EINVAL);

        /* Get the vnode for the file whose attributes are being set. */
        nameiflags = LOCKLEAF;
        if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
        NDINIT(&nd, LOOKUP, nameiflags, UIO_USERSPACE, (char *)uap->path, p);
        if (error = namei(&nd))
                return (error);

        /* Set up the UIO structure for use by the vfs routine */
        aiov.iov_base = uap->attributeBuffer;
        aiov.iov_len = uap->bufferSize;
        auio.uio_iov = &aiov;
        auio.uio_iovcnt = 1;
        auio.uio_offset = 0;
        auio.uio_rw = UIO_WRITE;
        auio.uio_segflg = UIO_USERSPACE;
        auio.uio_procp = p;
        auio.uio_resid = uap->bufferSize;

        error = VOP_SETATTRLIST(nd.ni_vp, &alist, &auio, p->p_ucred, p);

        vput(nd.ni_vp);

        return (error);

} /* end of setattrlist system call */


/*
* Obtain attribute information on objects in a directory while enumerating
* the directory.  This call does not yet support union mounted directories.
* TO DO
*  1.union mounted directories.
*/

struct getdirentriesattr_args {
      int fd;                   /* file descriptor */
      struct attrlist *alist;   /* bit map of requested attributes */
      void *buffer;             /* buffer to hold returned attribute info */
      size_t buffersize;        /* size of the return buffer */
      u_long *count;            /* the count of entries requested/returned */
      u_long *basep;            /* the offset of where we are leaving off in buffer */
      u_long *newstate;         /* a flag to inform of changes in directory */
      u_long options;           /* maybe unused for now */
};
/* ARGSUSED */
int
getdirentriesattr (p,uap,retval)
      struct proc *p;
      register struct getdirentriesattr_args *uap;
      register_t *retval;

{
        register struct vnode *vp;
        struct file *fp;
        struct uio auio;
        struct iovec aiov;
        u_long actualcount;
        u_long newstate;
        int error, eofflag;
        long loff;
        struct attrlist attributelist; 

        /* Get the attributes into kernel space */
        if (error = copyin((caddr_t)uap->alist, (caddr_t) &attributelist, sizeof (attributelist)))
           return(error);
        if (error = copyin((caddr_t)uap->count, (caddr_t) &actualcount, sizeof (u_long)))
           return(error);

        if (error = getvnode(p, uap->fd, &fp))
                return (error);
        if ((fp->f_flag & FREAD) == 0)
                return(EBADF);
        vp = (struct vnode *)fp->f_data;

        if (vp->v_type != VDIR)
            return(EINVAL);

        /* set up the uio structure which will contain the users return buffer */
        aiov.iov_base = uap->buffer;
        aiov.iov_len = uap->buffersize;
        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 = uap->buffersize;
        
        loff = auio.uio_offset = fp->f_offset;
        vn_lock(vp, LK_EXCLUSIVE | LK_RETRY, p);
        error = VOP_READDIRATTR (vp, &attributelist, &auio,
                   actualcount, uap->options, &newstate, &eofflag,
                   &actualcount, ((u_long **)0), p->p_cred);

        VOP_UNLOCK(vp, 0, p);
        if (error) return (error);
        fp->f_offset = auio.uio_offset; /* should be multiple of dirent, not variable */

        if (error = copyout((caddr_t) &actualcount, (caddr_t) uap->count, sizeof(u_long)))
            return (error);
        if (error = copyout((caddr_t) &newstate, (caddr_t) uap->newstate, sizeof(u_long)))
            return (error);
        if (error = copyout((caddr_t)&loff, (caddr_t)uap->basep, sizeof(long)))
            return (error);

        *retval = eofflag;  /* similar to getdirentries */
        return (0); /* return error earlier, an retval of 0 or 1 now */

} /* end of getdirentryattr system call */

/*
* Exchange data between two files
*/

struct exchangedata_args {
      const char *path1;        /* pathname of the first swapee  */
      const char *path2;        /* pathname of the second swapee */
      unsigned long options;    /* options */
};
/* ARGSUSED */
int
exchangedata (p,uap,retval)
      struct proc *p;
      register struct exchangedata_args *uap;
      register_t *retval;

{

        struct nameidata fnd, snd;
        struct vnode *fvp, *svp;
        int error;
        u_long nameiflags;

        nameiflags = 0;
        if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;

                /* Global lock, to prevent race condition, only one exchange at a time */
        lockmgr(&exchangelock, LK_EXCLUSIVE , (struct slock *)0, p);

        NDINIT(&fnd, LOOKUP, nameiflags, UIO_USERSPACE, (char *) uap->path1, p);

        if (error = namei(&fnd))
                goto out2;

        fvp = fnd.ni_vp;

        NDINIT(&snd, LOOKUP, nameiflags, UIO_USERSPACE, (char *)uap->path2, p);

        if (error = namei(&snd)) {
                        vrele(fvp);
            goto out2;
                }

        svp = snd.ni_vp;

        /* if the files are the same, return an inval error */
        if (svp == fvp) {
                vrele(fvp);
                vrele(svp);
        error = EINVAL;
                goto out2;
         } 

    vn_lock(fvp, LK_EXCLUSIVE | LK_RETRY, p);
    vn_lock(svp, LK_EXCLUSIVE | LK_RETRY, p);

        error = VOP_ACCESS(fvp, VWRITE, p->p_ucred, p);
        if (error) goto out;

        error = VOP_ACCESS(svp, VWRITE, p->p_ucred, p);
        if (error) goto out;

        /* Ok, make the call */
        error = VOP_EXCHANGE (fvp, svp, p->p_ucred, p);

out:
    vput (svp);
        vput (fvp);

out2:
    lockmgr(&exchangelock, LK_RELEASE, (struct slock *)0, p);

        if (error) {
        return (error);
                }
        
        return (0);

} /* end of exchangedata system call */

/*
* Check users access to a file 
*/

struct checkuseraccess_args {
     const char *path;          /* pathname of the target file   */
     uid_t userid;              /* user for whom we are checking access */
     gid_t *groups;             /* Group that we are checking for */
     int ngroups;               /* Number of groups being checked */
     int accessrequired;        /* needed access to the file */
     unsigned long options;     /* options */
};

/* ARGSUSED */
int
checkuseraccess (p,uap,retval)
     struct proc *p;
     register struct checkuseraccess_args *uap;
     register_t *retval;

{
        register struct vnode *vp;
        int error;
        struct nameidata nd;
        struct ucred cred;
        int flags;              /*what will actually get passed to access*/
        u_long nameiflags;

        /* Make sure that the number of groups is correct before we do anything */

        if ((uap->ngroups <=  0) || (uap->ngroups > NGROUPS))
                return (EINVAL);

        /* Verify that the caller is root */
        
        if (error = suser(p->p_ucred, &p->p_acflag))
                return(error);

        /* Fill in the credential structure */

        cred.cr_ref = 0;
        cred.cr_uid = uap->userid;
        cred.cr_ngroups = uap->ngroups;
        if (error = copyin((caddr_t) uap->groups, (caddr_t) &(cred.cr_groups), (sizeof(gid_t))*uap->ngroups))
                return (error);

        /* Get our hands on the file */

        nameiflags = LOCKLEAF;
        if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
        NDINIT(&nd, LOOKUP, nameiflags, UIO_USERSPACE, (char *)uap->path, p);

        if (error = namei(&nd))
                 return (error);
        vp = nd.ni_vp;
        
        /* Flags == 0 means only check for existence. */

        flags = 0;

        if (uap->accessrequired) {
                if (uap->accessrequired & R_OK)
                        flags |= VREAD;
                if (uap->accessrequired & W_OK)
                        flags |= VWRITE;
                if (uap->accessrequired & X_OK)
                        flags |= VEXEC;
                }
        error = VOP_ACCESS(vp, flags, &cred, p);
                        
        vput(vp);

        if (error) 
                return (error);
        
        return (0); 

} /* end of checkuseraccess system call */


struct searchfs_args {
        const char *path;
        struct fssearchblock *searchblock; 
        u_long *nummatches;
        u_long scriptcode;
        u_long options;
        struct searchstate *state; 
        };
/* ARGSUSED */

int
searchfs (p,uap,retval)
        struct proc *p;
        register struct searchfs_args *uap;
        register_t *retval;

{
        register struct vnode *vp;
        int error=0;
        int fserror = 0;
        struct nameidata nd;
        struct fssearchblock searchblock;
        struct searchstate *state;
        struct attrlist *returnattrs;
        void *searchparams1,*searchparams2;
        struct iovec aiov;
        struct uio auio;
        u_long nummatches;
        int mallocsize;
        u_long nameiflags;
        

        /* Start by copying in fsearchblock paramater list */

        if (error = copyin((caddr_t) uap->searchblock, (caddr_t) &searchblock,sizeof(struct fssearchblock)))
                return(error);

        /* Now malloc a big bunch of space to hold the search parameters, the attrlists and the search state. */
        /* It all has to do into local memory and it's not that big so we might as well  put it all together. */
        /* Searchparams1 shall be first so we might as well use that to hold the base address of the allocated*/
        /* block.                                                                                             */
        
        mallocsize = searchblock.sizeofsearchparams1+searchblock.sizeofsearchparams2 +
                      sizeof(struct attrlist) + sizeof(struct searchstate);

        MALLOC(searchparams1, void *, mallocsize, M_TEMP, M_WAITOK);

        /* Now set up the various pointers to the correct place in our newly allocated memory */

        searchparams2 = (void *) (((caddr_t) searchparams1) + searchblock.sizeofsearchparams1);
        returnattrs = (struct attrlist *) (((caddr_t) searchparams2) + searchblock.sizeofsearchparams2);
        state = (struct searchstate *) (((caddr_t) returnattrs) + sizeof (struct attrlist));

        /* Now copy in the stuff given our local variables. */

        if (error = copyin((caddr_t) searchblock.searchparams1, searchparams1,searchblock.sizeofsearchparams1))
                goto freeandexit;

        if (error = copyin((caddr_t) searchblock.searchparams2, searchparams2,searchblock.sizeofsearchparams2))
                goto freeandexit;

        if (error = copyin((caddr_t) searchblock.returnattrs, (caddr_t) returnattrs, sizeof(struct attrlist)))
                goto freeandexit;
                
        if (error = copyin((caddr_t) uap->state, (caddr_t) state, sizeof(struct searchstate)))
                goto freeandexit;
        
        /* set up the uio structure which will contain the users return buffer */

        aiov.iov_base = searchblock.returnbuffer;
        aiov.iov_len = searchblock.returnbuffersize;
        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 = searchblock.returnbuffersize;

        nameiflags = LOCKLEAF;
        if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
        NDINIT(&nd, LOOKUP, nameiflags, UIO_USERSPACE, (char *)uap->path, p);

        if (error = namei(&nd))
                goto freeandexit;

        vp = nd.ni_vp; 

         
        /*
         * If searchblock.maxmatches == 0, then skip the search. This has happened 
         * before and sometimes the underlyning code doesnt deal with it well.
         */
         if (searchblock.maxmatches == 0) {
                nummatches = 0;
                goto saveandexit;
         }

        /*
           Allright, we have everything we need, so lets make that call.
           
           We keep special track of the return value from the file system:
           EAGAIN is an acceptable error condition that shouldn't keep us
           from copying out any results...
         */

        fserror = VOP_SEARCHFS(vp,
                                                        searchparams1,
                                                        searchparams2,
                                                        &searchblock.searchattrs,
                                                        searchblock.maxmatches,
                                                        &searchblock.timelimit,
                                                        returnattrs,
                                                        &nummatches,
                                                        uap->scriptcode,
                                                        uap->options,
                                                        &auio,
                                                        state);
                
saveandexit:

        vput(vp);

        /* Now copy out the stuff that needs copying out. That means the number of matches, the
           search state.  Everything was already put into he return buffer by the vop call. */

        if (error = copyout((caddr_t) state, (caddr_t) uap->state, sizeof(struct searchstate)))
                goto freeandexit;

        if (error = copyout((caddr_t) &nummatches, (caddr_t) uap->nummatches, sizeof(u_long)))
                goto freeandexit;
        
        error = fserror;

freeandexit:

        FREE(searchparams1,M_TEMP);

        return(error);


} /* end of searchfs system call */


/*
 * Make a filesystem-specific control call:
 */
struct fsctl_args {
       const char *path;        /* pathname of the target object */
       u_long cmd;              /* cmd (also encodes size/direction of arguments a la ioctl) */
       caddr_t data;            /* pointer to argument buffer */
       u_long options;          /* options for fsctl processing */
};
/* ARGSUSED */
int
fsctl (p,uap,retval)
        struct proc *p;
        struct fsctl_args *uap;
        register_t *retval;

{
        int error;
        struct nameidata nd;    
        u_long nameiflags;
        u_long cmd = uap->cmd;
        register u_int size;
#define STK_PARAMS 128
        char stkbuf[STK_PARAMS];
        caddr_t data, memp;

        size = IOCPARM_LEN(cmd);
        if (size > IOCPARM_MAX) return (EINVAL);

        memp = NULL;
        if (size > sizeof (stkbuf)) {
                if ((memp = (caddr_t)kalloc(size)) == 0) return ENOMEM;
                data = memp;
        } else {
                data = stkbuf;
        };
        
        if (cmd & IOC_IN) {
                if (size) {
                        error = copyin(uap->data, data, (u_int)size);
                        if (error) goto FSCtl_Exit;
                } else {
                        *(caddr_t *)data = uap->data;
                };
        } else if ((cmd & IOC_OUT) && size) {
                /*
                 * Zero the buffer so the user always
                 * gets back something deterministic.
                 */
                bzero(data, size);
        } else if (cmd & IOC_VOID)
                *(caddr_t *)data = uap->data;

        /* Get the vnode for the file we are getting info on:  */
        nameiflags = LOCKLEAF;
        if ((uap->options & FSOPT_NOFOLLOW) == 0) nameiflags |= FOLLOW;
        NDINIT(&nd, LOOKUP, nameiflags, UIO_USERSPACE, (char *)uap->path, p);
        if (error = namei(&nd)) goto FSCtl_Exit;
        
        /* Invoke the filesystem-specific code */
        error = VOP_IOCTL(nd.ni_vp, IOCBASECMD(cmd), data, uap->options, p->p_ucred, p);
        
        vput(nd.ni_vp);
        
        /*
         * Copy any data to user, size was
         * already set and checked above.
         */
        if (error == 0 && (cmd & IOC_OUT) && size) error = copyout(data, uap->data, (u_int)size);
        
FSCtl_Exit:
        if (memp) kfree(memp, size);
        
        return error;
}
/* end of fsctl system call */

/*
 * An in-kernel sync for power management to call.
 */
__private_extern__ int
sync_internal(void)
{
        boolean_t   funnel_state;
        int error;

        struct sync_args data;

        int retval[2];

        funnel_state = thread_funnel_set(kernel_flock, TRUE);

        error = sync(current_proc(), &data, &retval);

        thread_funnel_set(kernel_flock, funnel_state);

        return (error);
} /* end of sync_internal call */