sys/ufs/ufs_vfsops.c

/*
 * Copyright (c) 1989, 1991 The Regents of the University of California.
 * All rights reserved.
 *
 * 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.
 *
 *      from: @(#)ufs_vfsops.c  7.56 (Berkeley) 6/28/91
 *      $Id$
 */

#include "param.h"
#include "systm.h"
#include "namei.h"
#include "proc.h"
#include "kernel.h"
#include "vnode.h"
#include "specdev.h"
#include "mount.h"
#include "buf.h"
#include "file.h"
#include "dkbad.h"      /* XXX */
#include "disklabel.h"
#include "ioctl.h"
#include "errno.h"
#include "malloc.h"

#include "quota.h"
#include "fs.h"
#include "ufsmount.h"
#include "inode.h"

struct vfsops ufs_vfsops = {
        ufs_mount,
        ufs_start,
        ufs_unmount,
        ufs_root,
        ufs_quotactl,
        ufs_statfs,
        ufs_sync,
        ufs_fhtovp,
        ufs_vptofh,
        ufs_init
};

/*
 * Flag to allow forcible unmounting.
 */
int doforce = 1;

/*
 * Called by vfs_mountroot when ufs is going to be mounted as root.
 *
 * Name is updated by mount(8) after booting.
 */
#define ROOTNAME        "root_device"

ufs_mountroot()
{
        register struct mount *mp;
        extern struct vnode *rootvp;
        struct proc *p = curproc;       /* XXX */
        struct ufsmount *ump;
        register struct fs *fs;
        u_int size;
        int error;

        mp = (struct mount *)malloc((u_long)sizeof(struct mount),
                M_MOUNT, M_WAITOK);
        mp->mnt_op = &ufs_vfsops;
        mp->mnt_flag = MNT_RDONLY;
        mp->mnt_exroot = 0;
        mp->mnt_mounth = NULLVP;
        error = mountfs(rootvp, mp, p);
        if (error) {
                free((caddr_t)mp, M_MOUNT);
                return (error);
        }
        if (error = vfs_lock(mp)) {
                (void)ufs_unmount(mp, 0, p);
                free((caddr_t)mp, M_MOUNT);
                return (error);
        }
        rootfs = mp;
        mp->mnt_next = mp;
        mp->mnt_prev = mp;
        mp->mnt_vnodecovered = NULLVP;
        ump = VFSTOUFS(mp);
        fs = ump->um_fs;
        bzero(fs->fs_fsmnt, sizeof(fs->fs_fsmnt));
        fs->fs_fsmnt[0] = '/';
        bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
            MNAMELEN);
        (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
            &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        (void) ufs_statfs(mp, &mp->mnt_stat, p);
        vfs_unlock(mp);
        inittodr(fs->fs_time);
        return (0);
}

/*
 * VFS Operations.
 *
 * mount system call
 */
ufs_mount(mp, path, data, ndp, p)
        register struct mount *mp;
        char *path;
        caddr_t data;
        struct nameidata *ndp;
        struct proc *p;
{
        struct vnode *devvp;
        struct ufs_args args;
        struct ufsmount *ump;
        register struct fs *fs;
        u_int size;
        int error;

        if (error = copyin(data, (caddr_t)&args, sizeof (struct ufs_args)))
                return (error);
        /*
         * Process export requests.
         */
        if ((args.exflags & MNT_EXPORTED) || (mp->mnt_flag & MNT_EXPORTED)) {
                if (args.exflags & MNT_EXPORTED)
                        mp->mnt_flag |= MNT_EXPORTED;
                else
                        mp->mnt_flag &= ~MNT_EXPORTED;
                if (args.exflags & MNT_EXRDONLY)
                        mp->mnt_flag |= MNT_EXRDONLY;
                else
                        mp->mnt_flag &= ~MNT_EXRDONLY;
                mp->mnt_exroot = args.exroot;
        }
        /*
         * If updating, check whether changing from read-only to
         * read/write; if there is no device name, that's all we do.
         */
        if (mp->mnt_flag & MNT_UPDATE) {
                ump = VFSTOUFS(mp);
                fs = ump->um_fs;
                if (fs->fs_ronly && (mp->mnt_flag & MNT_RDONLY) == 0)
                        fs->fs_ronly = 0;
                if (args.fspec == 0)
                        return (0);
        }
        /*
         * Not an update, or updating the name: look up the name
         * and verify that it refers to a sensible block device.
         */
        ndp->ni_nameiop = LOOKUP | FOLLOW;
        ndp->ni_segflg = UIO_USERSPACE;
        ndp->ni_dirp = args.fspec;
        if (error = namei(ndp, p))
                return (error);
        devvp = ndp->ni_vp;
        if (devvp->v_type != VBLK) {
                vrele(devvp);
                return (ENOTBLK);
        }
        if (major(devvp->v_rdev) >= nblkdev) {
                vrele(devvp);
                return (ENXIO);
        }
        if ((mp->mnt_flag & MNT_UPDATE) == 0)
                error = mountfs(devvp, mp, p);
        else {
                if (devvp != ump->um_devvp)
                        error = EINVAL; /* needs translation */
                else
                        vrele(devvp);
        }
        if (error) {
                vrele(devvp);
                return (error);
        }
        ump = VFSTOUFS(mp);
        fs = ump->um_fs;
        (void) copyinstr(path, fs->fs_fsmnt, sizeof(fs->fs_fsmnt) - 1, &size);
        bzero(fs->fs_fsmnt + size, sizeof(fs->fs_fsmnt) - size);
        bcopy((caddr_t)fs->fs_fsmnt, (caddr_t)mp->mnt_stat.f_mntonname,
            MNAMELEN);
        mp->mnt_stat.f_mntonname[MNAMELEN-1] = '\0';
        (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
            &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        (void) ufs_statfs(mp, &mp->mnt_stat, p);
        return (0);
}

/*
 * Common code for mount and mountroot
 */
mountfs(devvp, mp, p)
        register struct vnode *devvp;
        struct mount *mp;
        struct proc *p;
{
        register struct ufsmount *ump = (struct ufsmount *)0;
        struct buf *bp = NULL;
        register struct fs *fs;
        dev_t dev = devvp->v_rdev;
        struct partinfo dpart;
        caddr_t base, space;
        int havepart = 0, blks;
        int error, i, size;
        int needclose = 0;
        int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
        extern struct vnode *rootvp;

        /*
         * Disallow multiple mounts of the same device.
         * Disallow mounting of a device that is currently in use
         * (except for root, which might share swap device for miniroot).
         * Flush out any old buffers remaining from a previous use.
         */
        if (error = mountedon(devvp))
                return (error);
        if (vcount(devvp) > 1 && devvp != rootvp)
                return (EBUSY);
        vinvalbuf(devvp, 1);
        if (error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p))
                return (error);
        needclose = 1;
        if (VOP_IOCTL(devvp, DIOCGPART, (caddr_t)&dpart, FREAD, NOCRED, p) != 0)
                size = DEV_BSIZE;
        else {
                havepart = 1;
                size = dpart.disklab->d_secsize;
        }
        if (error = bread(devvp, SBLOCK, SBSIZE, NOCRED, &bp))
                goto out;
        fs = bp->b_un.b_fs;
        if (fs->fs_magic != FS_MAGIC || fs->fs_bsize > MAXBSIZE ||
            fs->fs_bsize < sizeof(struct fs)) {
                error = EINVAL;         /* XXX needs translation */
                goto out;
        }
        ump = (struct ufsmount *)malloc(sizeof *ump, M_UFSMNT, M_WAITOK);
        ump->um_fs = (struct fs *)malloc((u_long)fs->fs_sbsize, M_SUPERBLK,
            M_WAITOK);
        bcopy((caddr_t)bp->b_un.b_addr, (caddr_t)ump->um_fs,
           (u_int)fs->fs_sbsize);
        if (fs->fs_sbsize < SBSIZE)
                bp->b_flags |= B_INVAL;
        brelse(bp);
        bp = NULL;
        fs = ump->um_fs;
        fs->fs_ronly = ronly;
        if (ronly == 0)
                fs->fs_fmod = 1;
        if (havepart) {
                dpart.part->p_fstype = FS_BSDFFS;
                dpart.part->p_fsize = fs->fs_fsize;
                dpart.part->p_frag = fs->fs_frag;
                dpart.part->p_cpg = fs->fs_cpg;
        }
        blks = howmany(fs->fs_cssize, fs->fs_fsize);
        base = space = (caddr_t)malloc((u_long)fs->fs_cssize, M_SUPERBLK,
            M_WAITOK);
        for (i = 0; i < blks; i += fs->fs_frag) {
                size = fs->fs_bsize;
                if (i + fs->fs_frag > blks)
                        size = (blks - i) * fs->fs_fsize;
                error = bread(devvp, fsbtodb(fs, fs->fs_csaddr + i), size,
                        NOCRED, &bp);
                if (error) {
                        free((caddr_t)base, M_SUPERBLK);
                        goto out;
                }
                bcopy((caddr_t)bp->b_un.b_addr, space, (u_int)size);
                fs->fs_csp[fragstoblks(fs, i)] = (struct csum *)space;
                space += size;
                brelse(bp);
                bp = NULL;
        }
        mp->mnt_data = (qaddr_t)ump;
        mp->mnt_stat.f_fsid.val[0] = (long)dev;
        mp->mnt_stat.f_fsid.val[1] = MOUNT_UFS;
        mp->mnt_flag |= MNT_LOCAL;
        ump->um_mountp = mp;
        ump->um_dev = dev;
        ump->um_devvp = devvp;
        for (i = 0; i < MAXQUOTAS; i++)
                ump->um_quotas[i] = NULLVP;
        devvp->v_specflags |= SI_MOUNTEDON;

        /* Sanity checks for old file systems.                     XXX */
        fs->fs_npsect = MAX(fs->fs_npsect, fs->fs_nsect);       /* XXX */
        fs->fs_interleave = MAX(fs->fs_interleave, 1);          /* XXX */
        if (fs->fs_postblformat == FS_42POSTBLFMT)              /* XXX */
                fs->fs_nrpos = 8;                               /* XXX */
        return (0);
out:
        if (bp)
                brelse(bp);
        if (needclose)
                (void)VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
        if (ump) {
                free((caddr_t)ump->um_fs, M_SUPERBLK);
                free((caddr_t)ump, M_UFSMNT);
                mp->mnt_data = (qaddr_t)0;
        }
        return (error);
}

/*
 * Make a filesystem operational.
 * Nothing to do at the moment.
 */
/* ARGSUSED */
ufs_start(mp, flags, p)
        struct mount *mp;
        int flags;
        struct proc *p;
{

        return (0);
}

/*
 * unmount system call
 */
ufs_unmount(mp, mntflags, p)
        struct mount *mp;
        int mntflags;
        struct proc *p;
{
        register struct ufsmount *ump;
        register struct fs *fs;
        int i, error, ronly, flags = 0;

        if (mntflags & MNT_FORCE) {
                if (!doforce || mp == rootfs)
                        return (EINVAL);
                flags |= FORCECLOSE;
        }
        mntflushbuf(mp, 0);
        if (mntinvalbuf(mp))
                return (EBUSY);
        ump = VFSTOUFS(mp);
#ifdef QUOTA
        if (mp->mnt_flag & MNT_QUOTA) {
                if (error = vflush(mp, NULLVP, SKIPSYSTEM|flags))
                        return (error);
                for (i = 0; i < MAXQUOTAS; i++) {
                        if (ump->um_quotas[i] == NULLVP)
                                continue;
                        quotaoff(p, mp, i);
                }
                /*
                 * Here we fall through to vflush again to ensure
                 * that we have gotten rid of all the system vnodes.
                 */
        }
#endif
        if (error = vflush(mp, NULLVP, flags))
                return (error);
        fs = ump->um_fs;
        ronly = !fs->fs_ronly;
        ump->um_devvp->v_specflags &= ~SI_MOUNTEDON;
        error = VOP_CLOSE(ump->um_devvp, ronly ? FREAD : FREAD|FWRITE,
                NOCRED, p);
        vrele(ump->um_devvp);
        free((caddr_t)fs->fs_csp[0], M_SUPERBLK);
        free((caddr_t)fs, M_SUPERBLK);
        free((caddr_t)ump, M_UFSMNT);
        mp->mnt_data = (qaddr_t)0;
        mp->mnt_flag &= ~MNT_LOCAL;
        return (error);
}

/*
 * Check to see if a filesystem is mounted on a block device.
 */
mountedon(vp)
        register struct vnode *vp;
{
        register struct vnode *vq;

        if (vp->v_specflags & SI_MOUNTEDON)
                return (EBUSY);
        if (vp->v_flag & VALIASED) {
                for (vq = *vp->v_hashchain; vq; vq = vq->v_specnext) {
                        if (vq->v_rdev != vp->v_rdev ||
                            vq->v_type != vp->v_type)
                                continue;
                        if (vq->v_specflags & SI_MOUNTEDON)
                                return (EBUSY);
                }
        }
        return (0);
}

/*
 * Return root of a filesystem
 */
ufs_root(mp, vpp)
        struct mount *mp;
        struct vnode **vpp;
{
        register struct inode *ip;
        struct inode *nip;
        struct vnode tvp;
        int error;

        tvp.v_mount = mp;
        ip = VTOI(&tvp);
        ip->i_vnode = &tvp;
        ip->i_dev = VFSTOUFS(mp)->um_dev;
        error = iget(ip, (ino_t)ROOTINO, &nip);
        if (error)
                return (error);
        *vpp = ITOV(nip);
        return (0);
}

/*
 * Do operations associated with quotas
 */
ufs_quotactl(mp, cmds, uid, arg, p)
        struct mount *mp;
        int cmds;
        uid_t uid;
        caddr_t arg;
        struct proc *p;
{
        struct ufsmount *ump = VFSTOUFS(mp);
        int cmd, type, error;

#ifndef QUOTA
        return (EOPNOTSUPP);
#else
        if (uid == (uid_t)(-1))
                uid = p->p_cred->p_ruid;
        cmd = cmds >> SUBCMDSHIFT;

        switch (cmd) {
        case Q_GETQUOTA:
        case Q_SYNC:
                if (uid == p->p_cred->p_ruid)
                        break;
                /* fall through */
        default:
                if (error = suser(p->p_ucred, &p->p_acflag))
                        return (error);
        }

        type = cmd & SUBCMDMASK;
        if ((u_int)type >= MAXQUOTAS)
                return (EINVAL);

        switch (cmd) {

        case Q_QUOTAON:
                return (quotaon(p, mp, type, arg));

        case Q_QUOTAOFF:
                if (vfs_busy(mp))
                        return (0);
                error = quotaoff(p, mp, type);
                vfs_unbusy(mp);
                return (error);

        case Q_SETQUOTA:
                return (setquota(mp, uid, type, arg));

        case Q_SETUSE:
                return (setuse(mp, uid, type, arg));

        case Q_GETQUOTA:
                return (getquota(mp, uid, type, arg));

        case Q_SYNC:
                if (vfs_busy(mp))
                        return (0);
                error = qsync(mp);
                vfs_unbusy(mp);
                return (error);

        default:
                return (EINVAL);
        }
        /* NOTREACHED */
#endif
}

/*
 * Get file system statistics.
 */
ufs_statfs(mp, sbp, p)
        struct mount *mp;
        register struct statfs *sbp;
        struct proc *p;
{
        register struct ufsmount *ump;
        register struct fs *fs;

        ump = VFSTOUFS(mp);
        fs = ump->um_fs;
        if (fs->fs_magic != FS_MAGIC)
                panic("ufs_statfs");
        sbp->f_type = MOUNT_UFS;
        sbp->f_fsize = fs->fs_fsize;
        sbp->f_bsize = fs->fs_bsize;
        sbp->f_blocks = fs->fs_dsize;
        sbp->f_bfree = fs->fs_cstotal.cs_nbfree * fs->fs_frag +
                fs->fs_cstotal.cs_nffree;
        sbp->f_bavail = (fs->fs_dsize * (100 - fs->fs_minfree) / 100) -
                (fs->fs_dsize - sbp->f_bfree);
        sbp->f_files =  fs->fs_ncg * fs->fs_ipg - ROOTINO;
        sbp->f_ffree = fs->fs_cstotal.cs_nifree;
        if (sbp != &mp->mnt_stat) {
                bcopy((caddr_t)mp->mnt_stat.f_mntonname,
                        (caddr_t)&sbp->f_mntonname[0], MNAMELEN);
                bcopy((caddr_t)mp->mnt_stat.f_mntfromname,
                        (caddr_t)&sbp->f_mntfromname[0], MNAMELEN);
        }
        return (0);
}

int     syncprt = 0;

/*
 * Go through the disk queues to initiate sandbagged IO;
 * go through the inodes to write those that have been modified;
 * initiate the writing of the super block if it has been modified.
 *
 * Note: we are always called with the filesystem marked `MPBUSY'.
 */
ufs_sync(mp, waitfor)
        struct mount *mp;
        int waitfor;
{
        register struct vnode *vp;
        register struct inode *ip;
        register struct ufsmount *ump = VFSTOUFS(mp);
        register struct fs *fs;
        int error, allerror = 0;

        if (syncprt)
                bufstats();
        fs = ump->um_fs;
        /*
         * Write back modified superblock.
         * Consistency check that the superblock
         * is still in the buffer cache.
         */
        if (fs->fs_fmod != 0) {
                if (fs->fs_ronly != 0) {                /* XXX */
                        printf("fs = %s\n", fs->fs_fsmnt);
                        panic("update: rofs mod");
                }
                fs->fs_fmod = 0;
                fs->fs_time = time.tv_sec;
                allerror = sbupdate(ump, waitfor);
        }
        /*
         * Write back each (modified) inode.
         */
loop:
        for (vp = mp->mnt_mounth; vp; vp = vp->v_mountf) {
                /*
                 * If the vnode that we are about to sync is no longer
                 * associated with this mount point, start over.
                 */
                if (vp->v_mount != mp)
                        goto loop;
                if (VOP_ISLOCKED(vp))
                        continue;
                ip = VTOI(vp);
                if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) == 0 &&
                    vp->v_dirtyblkhd == NULL)
                        continue;
                if (vget(vp))
                        goto loop;
                if (vp->v_dirtyblkhd)
                        vflushbuf(vp, 0);
                if ((ip->i_flag & (IMOD|IACC|IUPD|ICHG)) &&
                    (error = iupdat(ip, &time, &time, 0)))
                        allerror = error;
                vput(vp);
        }
        /*
         * Force stale file system control information to be flushed.
         */
        vflushbuf(ump->um_devvp, waitfor == MNT_WAIT ? B_SYNC : 0);
#ifdef QUOTA
        qsync(mp);
#endif
        return (allerror);
}

/*
 * Write a superblock and associated information back to disk.
 */
sbupdate(mp, waitfor)
        struct ufsmount *mp;
        int waitfor;
{
        register struct fs *fs = mp->um_fs;
        register struct buf *bp;
        int blks;
        caddr_t space;
        int i, size, error = 0;

        bp = getblk(mp->um_devvp, SBLOCK, (int)fs->fs_sbsize);
        bcopy((caddr_t)fs, bp->b_un.b_addr, (u_int)fs->fs_sbsize);
        /* Restore compatibility to old file systems.              XXX */
        if (fs->fs_postblformat == FS_42POSTBLFMT)              /* XXX */
                bp->b_un.b_fs->fs_nrpos = -1;                   /* XXX */
        if (waitfor == MNT_WAIT)
                error = bwrite(bp);
        else
                bawrite(bp);
        blks = howmany(fs->fs_cssize, fs->fs_fsize);
        space = (caddr_t)fs->fs_csp[0];
        for (i = 0; i < blks; i += fs->fs_frag) {
                size = fs->fs_bsize;
                if (i + fs->fs_frag > blks)
                        size = (blks - i) * fs->fs_fsize;
                bp = getblk(mp->um_devvp, fsbtodb(fs, fs->fs_csaddr + i), size);
                bcopy(space, bp->b_un.b_addr, (u_int)size);
                space += size;
                if (waitfor == MNT_WAIT)
                        error = bwrite(bp);
                else
                        bawrite(bp);
        }
        return (error);
}

/*
 * Print out statistics on the current allocation of the buffer pool.
 * Can be enabled to print out on every ``sync'' by setting "syncprt"
 * above.
 */
bufstats()
{
        int s, i, j, count;
        register struct buf *bp, *dp;
        int counts[MAXBSIZE/CLBYTES+1];
        static char *bname[BQUEUES] = { "LOCKED", "LRU", "AGE", "EMPTY" };

        for (bp = bfreelist, i = 0; bp < &bfreelist[BQUEUES]; bp++, i++) {
                count = 0;
                for (j = 0; j <= MAXBSIZE/CLBYTES; j++)
                        counts[j] = 0;
                s = splbio();
                for (dp = bp->av_forw; dp != bp; dp = dp->av_forw) {
                        counts[dp->b_bufsize/CLBYTES]++;
                        count++;
                }
                splx(s);
                printf("%s: total-%d", bname[i], count);
                for (j = 0; j <= MAXBSIZE/CLBYTES; j++)
                        if (counts[j] != 0)
                                printf(", %d-%d", j * CLBYTES, counts[j]);
                printf("\n");
        }
}

/*
 * File handle to vnode
 *
 * Have to be really careful about stale file handles:
 * - check that the inode number is in range
 * - call iget() to get the locked inode
 * - check for an unallocated inode (i_mode == 0)
 * - check that the generation number matches
 */
ufs_fhtovp(mp, fhp, vpp)
        register struct mount *mp;
        struct fid *fhp;
        struct vnode **vpp;
{
        register struct ufid *ufhp;
        register struct fs *fs;
        register struct inode *ip;
        struct inode *nip;
        struct vnode tvp;
        int error;

        ufhp = (struct ufid *)fhp;
        fs = VFSTOUFS(mp)->um_fs;
        if (ufhp->ufid_ino < ROOTINO ||
            ufhp->ufid_ino >= fs->fs_ncg * fs->fs_ipg) {
                *vpp = NULLVP;
                return (EINVAL);
        }
        tvp.v_mount = mp;
        ip = VTOI(&tvp);
        ip->i_vnode = &tvp;
        ip->i_dev = VFSTOUFS(mp)->um_dev;
        if (error = iget(ip, ufhp->ufid_ino, &nip)) {
                *vpp = NULLVP;
                return (error);
        }
        ip = nip;
        if (ip->i_mode == 0) {
                iput(ip);
                *vpp = NULLVP;
                return (EINVAL);
        }
        if (ip->i_gen != ufhp->ufid_gen) {
                iput(ip);
                *vpp = NULLVP;
                return (EINVAL);
        }
        *vpp = ITOV(ip);
        return (0);
}

/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
ufs_vptofh(vp, fhp)
        struct vnode *vp;
        struct fid *fhp;
{
        register struct inode *ip = VTOI(vp);
        register struct ufid *ufhp;

        ufhp = (struct ufid *)fhp;
        ufhp->ufid_len = sizeof(struct ufid);
        ufhp->ufid_ino = ip->i_number;
        ufhp->ufid_gen = ip->i_gen;
        return (0);
}