xnu-124.7.tar.gz

[apple/xnu.git] / bsd / isofs / cd9660 / cd9660_vfsops.c

/*
 * Copyright (c) 2000 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@
 */
/*      $NetBSD: cd9660_vfsops.c,v 1.18 1995/03/09 12:05:36 mycroft Exp $       */

/*-
 * Copyright (c) 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley
 * by Pace Willisson (pace@blitz.com).  The Rock Ridge Extension
 * Support code is derived from software contributed to Berkeley
 * by Atsushi Murai (amurai@spec.co.jp).
 *
 * 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.
 *
 *      @(#)cd9660_vfsops.c     8.9 (Berkeley) 12/5/94
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <miscfs/specfs/specdev.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <dev/disk.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/ubc.h>

#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/iso_rrip.h>
#include <isofs/cd9660/cd9660_node.h>
#include <isofs/cd9660/cd9660_mount.h>

u_char isonullname[] = "\0";

extern int enodev ();

struct vfsops cd9660_vfsops = {
        cd9660_mount,
        cd9660_start,
        cd9660_unmount,
        cd9660_root,
        cd9660_quotactl,
        cd9660_statfs,
        cd9660_sync,
        cd9660_vget,
        cd9660_fhtovp,
        cd9660_vptofh,
        cd9660_init,
        cd9660_sysctl
};

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

static int iso_mountfs __P((struct vnode *devvp, struct mount *mp,
                struct proc *p, struct iso_args *argp));

static void DRGetTypeCreatorAndFlags(
                                struct iso_mnt * theMountPointPtr,
                                struct iso_directory_record * theDirRecPtr, 
                                u_int32_t * theTypePtr, 
                                u_int32_t * theCreatorPtr, 
                                u_int16_t * theFlagsPtr);

int     cd9660_vget_internal(
                struct mount *mp, 
                ino_t ino, 
                struct vnode **vpp, 
                int relocated, 
                struct iso_directory_record *isodir, 
                struct proc *p);

int
cd9660_mountroot()
{
        register struct mount *mp;
        extern struct vnode *rootvp;
        struct proc *p = current_proc();        /* XXX */
        struct iso_mnt *imp;
        size_t size;
        int error;
        struct iso_args args;
        
        /*
         * Get vnodes for swapdev and rootdev.
         */
        if ( bdevvp(rootdev, &rootvp))
                panic("cd9660_mountroot: can't setup bdevvp's");

        MALLOC_ZONE(mp, struct mount *,
                        sizeof(struct mount), M_MOUNT, M_WAITOK);
        bzero((char *)mp, (u_long)sizeof(struct mount));
        mp->mnt_op = &cd9660_vfsops;
        mp->mnt_flag = MNT_RDONLY;
        LIST_INIT(&mp->mnt_vnodelist);
        args.flags = ISOFSMNT_ROOT;
        args.ssector = 0;
        if ((error = iso_mountfs(rootvp, mp, p, &args))) {
                FREE_ZONE(mp, sizeof (struct mount), M_MOUNT);
                return (error);
        }
        simple_lock(&mountlist_slock);
        CIRCLEQ_INSERT_TAIL(&mountlist, mp, mnt_list);
        simple_unlock(&mountlist_slock);
        mp->mnt_vnodecovered = NULLVP;
        imp = VFSTOISOFS(mp);
        (void) copystr("/", mp->mnt_stat.f_mntonname, MNAMELEN - 1,
                &size);
        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        (void) copystr(ROOTNAME, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
                &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        (void)cd9660_statfs(mp, &mp->mnt_stat, p);
        return (0);
}

/*
 * VFS Operations.
 *
 * mount system call
 */
int
cd9660_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 iso_args args;
        size_t size;
        int error;
        struct iso_mnt *imp = NULL;
        
        if ((error = copyin(data, (caddr_t)&args, sizeof (struct iso_args))))
                return (error);
        
        if ((mp->mnt_flag & MNT_RDONLY) == 0)
                return (EROFS);

        /*
         * 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) {
                imp = VFSTOISOFS(mp);
                if (args.fspec == 0)
                        return (vfs_export(mp, &imp->im_export, &args.export));
        }
        /*
         * Not an update, or updating the name: look up the name
         * and verify that it refers to a sensible block device.
         */
        NDINIT(ndp, LOOKUP, FOLLOW, UIO_USERSPACE, args.fspec, p);
        if ((error = namei(ndp)))
                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 = iso_mountfs(devvp, mp, p, &args);
        else {
                if (devvp != imp->im_devvp)
                        error = EINVAL; /* needs translation */
                else
                        vrele(devvp);
        }
        if (error) {
                vrele(devvp);
                return (error);
        }

        /* Set the mount flag to indicate that we support volfs  */
        mp->mnt_flag |= MNT_DOVOLFS;

        (void) copyinstr(path, mp->mnt_stat.f_mntonname, MNAMELEN - 1, &size);
        bzero(mp->mnt_stat.f_mntonname + size, MNAMELEN - size);
        (void) copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
                &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        return (0);
}

/*
 * Common code for mount and mountroot
 */
static int
iso_mountfs(devvp, mp, p, argp)
        register struct vnode *devvp;
        struct mount *mp;
        struct proc *p;
        struct iso_args *argp;
{
        register struct iso_mnt *isomp = (struct iso_mnt *)0;
        struct buf *bp = NULL;
        struct buf *pribp = NULL, *supbp = NULL;
        dev_t dev = devvp->v_rdev;
        int error = EINVAL;
        int breaderr = 0;
        int needclose = 0;
        extern struct vnode *rootvp;
        u_long iso_bsize;
        int iso_blknum;
        int joliet_level;
        struct iso_volume_descriptor *vdp = NULL;
        struct iso_primary_descriptor *pri = NULL;
        struct iso_primary_descriptor *sup = NULL;
        struct iso_directory_record *rootp;
        int logical_block_size;
        u_int8_t vdtype;
        int blkoff = argp->ssector;
        
        if (!(mp->mnt_flag & MNT_RDONLY))
                return (EROFS);

        /*
         * 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 = vfs_mountedon(devvp)))
                return (error);
        if (vcount(devvp) > 1 && devvp != rootvp)
                return (EBUSY);
        if ((error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, 0)))
                return (error);

        if ((error = VOP_OPEN(devvp, FREAD, FSCRED, p)))
                return (error);
        needclose = 1;
        
        /* This is the "logical sector size".  The standard says this
         * should be 2048 or the physical sector size on the device,
         * whichever is greater.  For now, we'll just use a constant.
         */
        iso_bsize = ISO_DEFAULT_BLOCK_SIZE;

        /* tell IOKit that we're assuming 2K sectors */
        if ((error = VOP_IOCTL(devvp, DKIOCSETBLOCKSIZE,
             (caddr_t)&iso_bsize, FWRITE, p->p_ucred, p)))
                return (error);
        devvp->v_specsize = iso_bsize;
        joliet_level = 0;
        for (iso_blknum = 16 + blkoff; iso_blknum < (100 + blkoff); iso_blknum++) {
                if ((error = bread(devvp, iso_blknum, iso_bsize, NOCRED, &bp))) {
                        if (bp) {
                                bp->b_flags |= B_AGE;
                                brelse(bp);
                                bp = NULL;
                        }
                        breaderr = error;
                        printf("iso_mountfs: bread error %d reading block %d\n", error, iso_blknum);
                        continue;
                }

                vdp = (struct iso_volume_descriptor *)bp->b_data;
                if (bcmp (vdp->volume_desc_id, ISO_STANDARD_ID, sizeof(vdp->volume_desc_id)) != 0) {
#ifdef DEBUG
                        printf("cd9660_vfsops.c: iso_mountfs: "
                                        "Invalid ID in volume desciptor.\n");
#endif
                        error = EINVAL;
                        goto out;
                }
                
                vdtype = isonum_711 (vdp->type);
                if (vdtype == ISO_VD_END) 
                        break;

                if (vdtype == ISO_VD_PRIMARY) {
                        if (pribp == NULL) {
                                pribp = bp;
                                bp = NULL;
                                pri = (struct iso_primary_descriptor *)vdp;
                        }
                } else if(vdtype == ISO_VD_SUPPLEMENTARY) {
                        if (supbp == NULL) {
                                supbp = bp;
                                bp = NULL;
                                sup = (struct iso_primary_descriptor *)vdp;

                                if ((argp->flags & ISOFSMNT_NOJOLIET) == 0) {
                                        /*
                                         * some Joliet CDs are "out-of-spec and don't correctly
                                         * set the SVD flags. We ignore the flags and rely soely
                                         * on the escape_seq
                                         */
                                        if (bcmp(sup->escape_seq, ISO_UCS2_Level_1, 3) == 0)
                                                joliet_level = 1;
                                        else if (bcmp(sup->escape_seq, ISO_UCS2_Level_2, 3) == 0)
                                                joliet_level = 2;
                                        else if (bcmp(sup->escape_seq, ISO_UCS2_Level_3, 3) == 0)
                                                joliet_level = 3;
                                }
                        }
                }

                if (bp) {
                        bp->b_flags |= B_AGE;
                        brelse(bp);
                        bp = NULL;
                }
        }

        if (bp) {
                bp->b_flags |= B_AGE;
                brelse(bp);
                bp = NULL;
        }
        
        if (pri == NULL) {
                if (breaderr)
                        error = breaderr;
                else
                        error = EINVAL;
                goto out;
        }
        
        logical_block_size = isonum_723 (pri->logical_block_size);
        
        if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE
            || (logical_block_size & (logical_block_size - 1)) != 0) {
                error = EINVAL;
                goto out;
        }
        
        rootp = (struct iso_directory_record *)pri->root_directory_record;
        
        MALLOC(isomp, struct iso_mnt *, sizeof *isomp, M_ISOFSMNT, M_WAITOK);
        bzero((caddr_t)isomp, sizeof *isomp);
        isomp->logical_block_size = logical_block_size;
        isomp->volume_space_size = isonum_733 (pri->volume_space_size);
        /*
         * Since an ISO9660 multi-session CD can also access previous
         * sessions, we have to include them into the space consider-
         * ations.  This doesn't yield a very accurate number since
         * parts of the old sessions might be inaccessible now, but we
         * can't do much better.  This is also important for the NFS
         * filehandle validation.
         */
        isomp->volume_space_size += blkoff;
        bcopy (rootp, isomp->root, sizeof isomp->root);
        isomp->root_extent = isonum_733 (rootp->extent);
        isomp->root_size = isonum_733 (rootp->size);

        /*
         * getattrlist wants the volume name, create date and modify date
         */

        /* Remove any trailing white space */
        if ( strlen(pri->volume_id) ) {
                char            *myPtr;

                myPtr = pri->volume_id + strlen( pri->volume_id ) - 1;
                while ( *myPtr == ' ' && myPtr >= pri->volume_id ) {
                        *myPtr = 0x00;
                        myPtr--;
                }
        }
        /* YYY need to use secondary volume descriptor name for kanji disks */
        bcopy(pri->volume_id, isomp->volume_id, sizeof(isomp->volume_id));
        cd9660_tstamp_conv17(pri->creation_date, &isomp->creation_date);
        cd9660_tstamp_conv17(pri->modification_date, &isomp->modification_date);

        /* See if this is a CD-XA volume */
        if (bcmp( pri->CDXASignature, ISO_XA_ID,
                        sizeof(pri->CDXASignature) ) == 0 ) 
                isomp->im_flags2 |= IMF2_IS_CDXA;

        isomp->im_bmask = logical_block_size - 1;
        isomp->im_bshift = 0;
        while ((1 << isomp->im_bshift) < isomp->logical_block_size)
                isomp->im_bshift++;

        pribp->b_flags |= B_AGE;
        brelse(pribp);
        pribp = NULL;

        mp->mnt_data = (qaddr_t)isomp;
        mp->mnt_stat.f_fsid.val[0] = (long)dev;
        mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
        mp->mnt_maxsymlinklen = 0;
        mp->mnt_flag |= MNT_LOCAL;

        isomp->im_mountp = mp;
        isomp->im_dev = dev;
        isomp->im_devvp = devvp;        

        devvp->v_specflags |= SI_MOUNTEDON;
        
        /* Check the Rock Ridge Extention support */
        if (!(argp->flags & ISOFSMNT_NORRIP)) {
                if ( (error = bread(isomp->im_devvp,
                                  (isomp->root_extent + isonum_711(rootp->ext_attr_length)),
                                  isomp->logical_block_size, NOCRED, &bp)) ) {

                        printf("iso_mountfs: bread error %d reading block %d\n",
                           error, isomp->root_extent + isonum_711(rootp->ext_attr_length));
                        argp->flags |= ISOFSMNT_NORRIP;
                        goto skipRRIP;
                }
                rootp = (struct iso_directory_record *)bp->b_data;
                
                if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) {
                        argp->flags  |= ISOFSMNT_NORRIP;
                } else {
                        argp->flags  &= ~ISOFSMNT_GENS;
                }
                
                /*
                 * The contents are valid,
                 * but they will get reread as part of another vnode, so...
                 */
                bp->b_flags |= B_AGE;
                brelse(bp);
                bp = NULL;
        }
skipRRIP:

        isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
                                         ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET);

        switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) {
        default:
                isomp->iso_ftype = ISO_FTYPE_DEFAULT;
                break;
        case ISOFSMNT_GENS|ISOFSMNT_NORRIP:
                isomp->iso_ftype = ISO_FTYPE_9660;
                break;
        case 0:
                isomp->iso_ftype = ISO_FTYPE_RRIP;
                break;
        }
        
        /* Decide whether to use the Joliet descriptor */

        if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level != 0) {
                rootp = (struct iso_directory_record *)
                        sup->root_directory_record;
                bcopy (rootp, isomp->root, sizeof isomp->root);
                isomp->root_extent = isonum_733 (rootp->extent);
                isomp->root_size = isonum_733 (rootp->size);
                supbp->b_flags |= B_AGE;
                isomp->iso_ftype = ISO_FTYPE_JOLIET;
        }

        if (supbp) {
                brelse(supbp);
                supbp = NULL;
        }

        return (0);
out:
        if (bp)
                brelse(bp);
        if (pribp)
                brelse(pribp);
        if (supbp)
                brelse(supbp);
        if (needclose)
                (void)VOP_CLOSE(devvp, FREAD, NOCRED, p);
        if (isomp) {
                FREE((caddr_t)isomp, M_ISOFSMNT);
                mp->mnt_data = (qaddr_t)0;
        }

        /* Clear the mounted on bit in the devvp If it   */
        /* not set, this is a nop and there is no way to */
        /* get here with it set unless we did it.  If you*/
        /* are making code changes which makes the above */
        /* assumption not true, change this code.        */

        devvp->v_specflags &= ~SI_MOUNTEDON;

        return (error);
}

/*
 * Make a filesystem operational.
 * Nothing to do at the moment.
 */
/* ARGSUSED */
int
cd9660_start(mp, flags, p)
        struct mount *mp;
        int flags;
        struct proc *p;
{
        return (0);
}

/*
 * unmount system call
 */
int
cd9660_unmount(mp, mntflags, p)
        struct mount *mp;
        int mntflags;
        struct proc *p;
{
        register struct iso_mnt *isomp;
        int error, flags = 0;
        
        if ( (mntflags & MNT_FORCE) )
                flags |= FORCECLOSE;

        if ( (error = vflush(mp, NULLVP, flags)) )
                return (error);

        isomp = VFSTOISOFS(mp);

#ifdef  ISODEVMAP
        if (isomp->iso_ftype == ISO_FTYPE_RRIP)
                iso_dunmap(isomp->im_dev);
#endif
        
        isomp->im_devvp->v_specflags &= ~SI_MOUNTEDON;
        error = VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED, p);
        vrele(isomp->im_devvp);
        FREE((caddr_t)isomp, M_ISOFSMNT);
        mp->mnt_data = (qaddr_t)0;
        mp->mnt_flag &= ~MNT_LOCAL;

        return (error);
}

/*
 * Return root of a filesystem
 */
int
cd9660_root(mp, vpp)
        struct mount *mp;
        struct vnode **vpp;
{
        struct iso_mnt *imp = VFSTOISOFS(mp);
        struct iso_directory_record *dp =
                (struct iso_directory_record *)imp->root;
        ino_t ino = isodirino(dp, imp);

        /*
         * With RRIP we must use the `.' entry of the root directory.
         * Simply tell vget, that it's a relocated directory.
         */
        return (cd9660_vget_internal(mp, ino, vpp,
                imp->iso_ftype == ISO_FTYPE_RRIP, dp, current_proc()));
}

/*
 * Do operations associated with quotas, not supported
 */
/* ARGSUSED */
int
cd9660_quotactl(mp, cmd, uid, arg, p)
        struct mount *mp;
        int cmd;
        uid_t uid;
        caddr_t arg;
        struct proc *p;
{

        return (EOPNOTSUPP);
}

/*
 * Get file system statistics.
 */
int
cd9660_statfs(mp, sbp, p)
        struct mount *mp;
        register struct statfs *sbp;
        struct proc *p;
{
        register struct iso_mnt *isomp;
        
        isomp = VFSTOISOFS(mp);

#ifdef COMPAT_09
        sbp->f_type = 5;
#else
        sbp->f_type = 0;
#endif
        sbp->f_bsize = isomp->logical_block_size;
        sbp->f_iosize = sbp->f_bsize;   /* XXX */
        sbp->f_blocks = isomp->volume_space_size;
        sbp->f_bfree = 0; /* total free blocks */
        sbp->f_bavail = 0; /* blocks free for non superuser */
        sbp->f_files =  0; /* total files */
        sbp->f_ffree = 0; /* free file nodes */
        if (sbp != &mp->mnt_stat) {
                bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN);
                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        }

        strncpy( sbp->f_fstypename, mp->mnt_vfc->vfc_name, (MFSNAMELEN - 1) );
        sbp->f_fstypename[(MFSNAMELEN - 1)] = '\0';

        /* DO NOT use the first spare for flags; it's been reassigned for another use: */
        /* sbp->f_spare[0] = isomp->im_flags; */

        return (0);
}

/* ARGSUSED */
int
cd9660_sync(mp, waitfor, cred, p)
        struct mount *mp;
        int waitfor;
        struct ucred *cred;
        struct proc *p;
{

        return (0);
}

/*
 * 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
 */

struct ifid {
        ushort  ifid_len;
        ushort  ifid_pad;
        int     ifid_ino;
        long    ifid_start;
};

/* ARGSUSED */
int
cd9660_fhtovp(mp, fhp, nam, vpp, exflagsp, credanonp)
        register struct mount *mp;
        struct fid *fhp;
        struct mbuf *nam;
        struct vnode **vpp;
        int *exflagsp;
        struct ucred **credanonp;
{
        struct ifid *ifhp = (struct ifid *)fhp;
        register struct iso_node *ip;
        register struct netcred *np;
        register struct iso_mnt *imp = VFSTOISOFS(mp);
        struct vnode *nvp;
        int error;
        
#ifdef  ISOFS_DBG
        printf("fhtovp: ino %d, start %ld\n",
               ifhp->ifid_ino, ifhp->ifid_start);
#endif
        
        /*
         * Get the export permission structure for this <mp, client> tuple.
         */
        np = vfs_export_lookup(mp, &imp->im_export, nam);
        if (np == NULL)
                return (EACCES);

        if ( (error = VFS_VGET(mp, &ifhp->ifid_ino, &nvp)) ) {
                *vpp = NULLVP;
                return (error);
        }
        ip = VTOI(nvp);
        if (ip->inode.iso_mode == 0) {
                vput(nvp);
                *vpp = NULLVP;
                return (ESTALE);
        }
        *vpp = nvp;
        *exflagsp = np->netc_exflags;
        *credanonp = &np->netc_anon;
        return (0);
}

int
cd9660_vget(mp, ino, vpp)
        struct mount *mp;
        void *ino;
        struct vnode **vpp;
{
        /*
         * XXXX
         * It would be nice if we didn't always set the `relocated' flag
         * and force the extra read, but I don't want to think about fixing
         * that right now.
         */

        return ( cd9660_vget_internal( mp, *(ino_t*)ino, vpp, 0, 
                                                                   (struct iso_directory_record *) 0,
                                                                   current_proc()) );
}

int
cd9660_vget_internal(mp, ino, vpp, relocated, isodir, p)
        struct mount *mp;
        ino_t ino;
        struct vnode **vpp;
        int relocated;
        struct iso_directory_record *isodir;
    struct proc *p;
{
        register struct iso_mnt *imp;
        struct iso_node *ip;
        struct buf *bp;
        struct vnode *vp, *nvp;
        dev_t dev;
        int error;

        imp = VFSTOISOFS(mp);
        dev = imp->im_dev;

        /* Check for unmount in progress */
    if (mp->mnt_kern_flag & MNTK_UNMOUNT) {
        *vpp = NULLVP;
        return (EPERM);
    }

        if ((*vpp = cd9660_ihashget(dev, ino, p)) != NULLVP)
                return (0);

        MALLOC_ZONE(ip, struct iso_node *, sizeof(struct iso_node),
            M_ISOFSNODE, M_WAITOK);
        /* Allocate a new vnode/iso_node. */
        if ( (error = getnewvnode(VT_ISOFS, mp, cd9660_vnodeop_p, &vp)) ) {
                FREE_ZONE(ip,sizeof(struct iso_node), M_ISOFSNODE);
                *vpp = NULLVP;
                return (error);
        }
        bzero((caddr_t)ip, sizeof(struct iso_node));
        lockinit(&ip->i_lock, PINOD,"isonode",0,0);
        vp->v_data = ip;
        ip->i_vnode = vp;
        ip->i_dev = dev;
        ip->i_number = ino;
        ip->i_namep = &isonullname[0];

        /*
         * Put it onto its hash chain and lock it so that other requests for
         * this inode will block if they arrive while we are sleeping waiting
         * for old data structures to be purged or for the contents of the
         * disk portion of this inode to be read.
         */
        cd9660_ihashins(ip);

        if (isodir == 0) {
                int lbn, off;

                lbn = lblkno(imp, ino);
                if (lbn >= imp->volume_space_size) {
                        vput(vp);
                        printf("fhtovp: lbn exceed volume space %d\n", lbn);
                        return (ESTALE);
                }
        
                off = blkoff(imp, ino);
                if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
                        vput(vp);
                        printf("fhtovp: crosses block boundary %d\n",
                                off + ISO_DIRECTORY_RECORD_SIZE);
                        return (ESTALE);
                }
        
                error = bread(imp->im_devvp, lbn,
                                        imp->logical_block_size, NOCRED, &bp);
                if (error) {
                        vput(vp);
                        brelse(bp);
                        printf("fhtovp: bread error %d\n",error);
                        return (error);
                }
                isodir = (struct iso_directory_record *)(bp->b_data + off);

                if (off + isonum_711(isodir->length) >
                        imp->logical_block_size) {
                        vput(vp);
                        if (bp != 0)
                                brelse(bp);
                        printf("fhtovp: directory crosses block boundary "
                                "%d[off=%d/len=%d]\n",
                                off +isonum_711(isodir->length), off,
                                isonum_711(isodir->length));
                        return (ESTALE);
                }

                /*
                 * for directories we can get parentID from adjacent 
                 * parent directory record
                 */
                if ((isonum_711(isodir->flags) & directoryBit)
                                && (isodir->name[0] == 0)) {
                        struct iso_directory_record *pdp;

                        pdp = (struct iso_directory_record *)
                                        ((char *)bp->b_data + isonum_711(isodir->length));
                        if ((isonum_711(pdp->flags) & directoryBit)
                                        && (pdp->name[0] == 1))
                                ip->i_parent = isodirino(pdp, imp);
                }
        } else
                bp = 0;

        ip->i_mnt = imp;
        ip->i_devvp = imp->im_devvp;
        VREF(ip->i_devvp);

        if (relocated) {
                /*
                 * On relocated directories we must
                 * read the `.' entry out of a dir.
                 */
                ip->iso_start = ino >> imp->im_bshift;
                if (bp != 0)
                        brelse(bp);
                if ( (error = VOP_BLKATOFF(vp, (off_t)0, NULL, &bp)) ) {
                        vput(vp);
                        return (error);
                }
                isodir = (struct iso_directory_record *)bp->b_data;
        }

        /*
         * go get apple extensions to ISO directory record or use
         * defaults when there are no apple extensions.
         */
        if ( (isonum_711( isodir->flags ) & directoryBit) == 0 ) {
                /* This is an ISO directory record for a file */
                DRGetTypeCreatorAndFlags( imp, isodir, &ip->i_FileType, 
                                                                  &ip->i_Creator, &ip->i_FinderFlags );
        }

        ip->iso_extent = isonum_733(isodir->extent);
        ip->i_size = isonum_733(isodir->size);
        ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;

        /*
         * if we have a valid name, fill in i_namep with UTF-8 name
         */
        if (isonum_711(isodir->name_len) != 0) {
                u_char *utf8namep;
                u_short namelen;
                ino_t inump = 0;

                MALLOC(utf8namep, u_char *, ISO_RRIP_NAMEMAX + 1, M_TEMP, M_WAITOK);
                namelen = isonum_711(isodir->name_len);

                switch (imp->iso_ftype) {
                case ISO_FTYPE_RRIP:
                        cd9660_rrip_getname(isodir, utf8namep, &namelen, &inump, imp);
                        break;

                case ISO_FTYPE_JOLIET:
                        ucsfntrans((u_int16_t *)isodir->name, namelen,
                                   utf8namep, &namelen,
                                   isonum_711(isodir->flags) & directoryBit);
                        break;

                default:
                        isofntrans (isodir->name, namelen,
                                        utf8namep, &namelen,
                                        imp->iso_ftype == ISO_FTYPE_9660);
                }

                utf8namep[namelen] = '\0';
                MALLOC(ip->i_namep, u_char *, namelen + 1, M_TEMP, M_WAITOK);
                bcopy(utf8namep, ip->i_namep, namelen + 1);
                FREE(utf8namep, M_TEMP);
        }

        /*
         * Setup time stamp, attribute
         */
        vp->v_type = VNON;
        switch (imp->iso_ftype) {
        default:        /* ISO_FTYPE_9660 */
                {
                struct buf *bp2;
                int off;
                if ((imp->im_flags & ISOFSMNT_EXTATT)
                                && (off = isonum_711(isodir->ext_attr_length)))
                        VOP_BLKATOFF(vp, (off_t)-(off << imp->im_bshift), NULL, &bp2);
                else
                        bp2 = NULL;
                cd9660_defattr(isodir, ip, bp2);
                cd9660_deftstamp(isodir, ip, bp2);
                if (bp2)
                        brelse(bp2);
                break;
                }
        case ISO_FTYPE_RRIP:
                cd9660_rrip_analyze(isodir, ip, imp);
                break;
        }

        if (bp != 0)
                brelse(bp);

        /*
         * Initialize the associated vnode
         */
         
        if (ip->iso_extent == imp->root_extent) {
                vp->v_flag |= VROOT;
                ip->i_parent = 1;       /* root's parent is always 1 by convention */
                /* mode type must be S_IFDIR */
                ip->inode.iso_mode = (ip->inode.iso_mode & ~S_IFMT) | S_IFDIR;
        }

        switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
        case VFIFO:
#if     FIFO
                vp->v_op = cd9660_fifoop_p;
                break;
#else
                vput(vp);
                return (EOPNOTSUPP);
#endif  /* FIFO */
        case VCHR:
        case VBLK:
                /*
                 * if device, look at device number table for translation
                 */
#ifdef  ISODEVMAP
                if (dp = iso_dmap(dev, ino, 0))
                        ip->inode.iso_rdev = dp->d_dev;
#endif
                vp->v_op = cd9660_specop_p;
                if ( (nvp = checkalias(vp, ip->inode.iso_rdev, mp)) ) {
                        /*
                         * Discard unneeded vnode, but save its iso_node.
                         */
                        cd9660_ihashrem(ip);
                        VOP_UNLOCK(vp, 0, p);
                        nvp->v_data = vp->v_data;
                        vp->v_data = NULL;
                        vp->v_op = spec_vnodeop_p;
                        vrele(vp);
                        vgone(vp);
                        /*
                         * Reinitialize aliased inode.
                         */
                        vp = nvp;
                        ip->i_vnode = vp;
                        cd9660_ihashins(ip);
                }
                break;
        case VREG:
                ubc_info_init(vp);
                break;
        default:
                break;
        }
        
        /*
         * XXX need generation number?
         */

        *vpp = vp;

        return (0);
}


/************************************************************************
 *
 *  Function:   DRGetTypeCreatorAndFlags
 *
 *  Purpose:    Set up the fileType, fileCreator and fileFlags
 *
 *  Returns:    none
 *
 *  Side Effects:       sets *theTypePtr, *theCreatorPtr, and *theFlagsPtr
 *
 *  Description:
 *
 *  Revision History:
 *      28 Jul 88       BL¡B   Added a new extension type of 6, which allows
 *                                              the specification of four of the finder flags.
 *                                              We let the creator of the disk just copy over
 *                                              the finder flags, but we only look at always
 *                                              switch launch, system, bundle, and locked bits.
 *      15 Aug 88       BL¡B   The Apple extensions to ISO 9660 implemented the
 *                                              padding field at the end of a directory record
 *                                              incorrectly.
 *      19 Jul 89       BG              Rewrote routine to handle the "new" Apple
 *                                              Extensions definition, as well as take into
 *                                              account the possibility of "other" definitions.
 *      02 Nov 89       BG              Corrected the 'AA' SystemUseID processing to
 *                                              check for SystemUseID == 2 (HFS).  Was incorrectly
 *                                              checking for SystemUseID == 1 (ProDOS) before.
 *      18 Mar 92       CMP             Fixed the check for whether len_fi was odd or even.
 *                                              Before it would always assume even for an XA record.
 *      26 Dec 97       jwc             Swiped from MacOS implementation of ISO 9660 CD-ROM
 *                                              support and modified to work in MacOSX file system.
 *
 *********************************************************************** */
 
static void
DRGetTypeCreatorAndFlags(       struct iso_mnt * theMountPointPtr,
                                                        struct iso_directory_record * theDirRecPtr, 
                                                        u_int32_t * theTypePtr, 
                                                        u_int32_t * theCreatorPtr, 
                                                        u_int16_t * theFlagsPtr )
{
        int                                     foundStuff;
        u_int32_t                       myType;
        u_int32_t                       myCreator;
        AppleExtension          *myAppleExtPtr;
        NewAppleExtension       *myNewAppleExtPtr;
        u_int16_t                       myFinderFlags;
        char                            *myPtr;

        foundStuff = 1;
        myType = 0L;
        myCreator = 0L;
        myFinderFlags = 0;
        *theFlagsPtr = 0x0000;

        /*
         * handle the fact that our original apple extensions didn't take
         * into account the padding byte on a file name
         */

        myPtr = &theDirRecPtr->name[ (isonum_711(theDirRecPtr->name_len)) ];
        
        /* if string length is even, bump myPtr for padding byte */
        if ( ((isonum_711(theDirRecPtr->name_len)) & 0x01) == 0 )
                myPtr++;
        myAppleExtPtr = (AppleExtension *) myPtr;

        /*
         * checking for whether or not the new 'AA' code is being 
         * called (and if so, correctly)
         */
        if ( (isonum_711(theDirRecPtr->length)) <= 
                 ISO_DIRECTORY_RECORD_SIZE + (isonum_711(theDirRecPtr->name_len)) ) {
                foundStuff = 0;
                goto DoneLooking;
        }

        foundStuff = 0; /* now we default to *false* until we find a good one */
        myPtr = (char *) myAppleExtPtr;

        if ( (theMountPointPtr->im_flags2 & IMF2_IS_CDXA) != 0 )
                myPtr += 14;/* add in CD-XA fixed record offset (tnx, Phillips) */
        myNewAppleExtPtr = (NewAppleExtension *) myPtr;

        /* calculate the "real" end of the directory record information */
        myPtr = ((char *) theDirRecPtr) + (isonum_711(theDirRecPtr->length));
        while( (char *) myNewAppleExtPtr < myPtr )      /* end of directory buffer */
        {
                /*
                 *      If we get here, we can assume that ALL further entries in this
                 *      directory record are of the form:
                 *
                 *              struct OptionalSystemUse
                 *              {
                 *                      byte    Signature[2];
                 *                      byte    systemUseID;
                 *                      byte    OSULength;
                 *                      byte    fileType[4];            # only if HFS
                 *                      byte    fileCreator[4];         # only if HFS
                 *                      byte    finderFlags[2];         # only if HFS
                 *              };
                 *
                 *      This means that we can examine the Signature bytes to see
                 *      if they are 'AA' (the NEW Apple extension signature).
                 *      If they are, deal with them.  If they aren't,
                 *      the OSULength field will tell us how long this extension
                 *      info is (including the signature and length bytes) and that
                 *      will allow us to walk the OptionalSystemUse records until
                 *      we hit the end of them or run off the end of the 
                 *      directory record.
                 */
                u_char                          *myFromPtr, *myToPtr;
                union
                {
                        u_int32_t               fourchars;
                        u_char                  chars[4];
                } myChars;

                if ( (myNewAppleExtPtr->signature[0] == 'A') &&
                        (myNewAppleExtPtr->signature[1] == 'A') ) {
                        if ( isonum_711(myNewAppleExtPtr->systemUseID) == 2 ) {
                                /* HFS */
                                foundStuff = 1;                 /* we got one! */

                                myFromPtr = &myNewAppleExtPtr->fileType[0]; 
                                myToPtr = &myChars.chars[0];
                                *myToPtr++ = *myFromPtr++; 
                                *myToPtr++ = *myFromPtr++; 
                                *myToPtr++ = *myFromPtr++; 
                                *myToPtr = *myFromPtr;
                                myType = myChars.fourchars;     /* copy file type to user var */

                                myFromPtr = &myNewAppleExtPtr->fileCreator[0]; 
                                myToPtr = &myChars.chars[0];
                                *myToPtr++ = *myFromPtr++; 
                                *myToPtr++ = *myFromPtr++; 
                                *myToPtr++ = *myFromPtr++; 
                                *myToPtr = *myFromPtr;
                                myCreator = myChars.fourchars;  /* copy creator to user var */

                                myFromPtr = &myNewAppleExtPtr->finderFlags[0]; 
                                myToPtr = &myChars.chars[2];    /* *flags* is a short */
                                myChars.fourchars = 0; 
                                *myToPtr++ = *myFromPtr++; 
                                *myToPtr = *myFromPtr;
                                myFinderFlags = myChars.fourchars;
                                myFinderFlags &=
                                        ( fAlwaysBit | fSystemBit | fHasBundleBit | fLockedBit );
                                /* return Finder flags to user var */
                                *theFlagsPtr = (myFinderFlags | fInitedBit);

                                break;          /* exit the loop */
                        }
                }

                /*
                 *      Check to see if we have a reasonable OSULength value.
                 *      ZERO is not an acceptable value.  Nor is any value less than 4.
                 */

                if ( (isonum_711(myNewAppleExtPtr->OSULength)) < 4 ) 
                        break;  /* not acceptable - get out! */

                /* otherwise, step past this SystemUse record */
                (char *)myNewAppleExtPtr += (isonum_711(myNewAppleExtPtr->OSULength));
                
        } /* end of while loop */

DoneLooking:
        if ( foundStuff != 0 ) {
                *theTypePtr    = myType;
                *theCreatorPtr = myCreator;
        } else {
                *theTypePtr = 0;
                *theCreatorPtr = 0;
        }
        
        return;
        
} /* DRGetTypeCreatorAndFlags */


/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
int
cd9660_vptofh(vp, fhp)
        struct vnode *vp;
        struct fid *fhp;
{
        register struct iso_node *ip = VTOI(vp);
        register struct ifid *ifhp;
        
        ifhp = (struct ifid *)fhp;
        ifhp->ifid_len = sizeof(struct ifid);
        
        ifhp->ifid_ino = ip->i_number;
        ifhp->ifid_start = ip->iso_start;
        
#ifdef  ISOFS_DBG
        printf("vptofh: ino %d, start %ld\n",
               ifhp->ifid_ino,ifhp->ifid_start);
#endif
        return (0);
}

/*
 * Fast-FileSystem only?
 */
int
cd9660_sysctl(name, namelen, oldp, oldlenp, newp, newlen, p)
     int * name;
     u_int namelen;
     void* oldp;
     size_t * oldlenp;
     void * newp;
     size_t newlen;
     struct proc * p;
{
     return (EOPNOTSUPP);
}