path: root/sys/isofs/cd9660/cd9660_vfsops.c

/*	$OpenBSD: cd9660_vfsops.c,v 1.98 2023/07/17 09:41:20 semarie Exp $	*/
/*	$NetBSD: cd9660_vfsops.c,v 1.26 1997/06/13 15:38:58 pk 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. 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/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/specdev.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/fcntl.h>
#include <sys/disklabel.h>
#include <sys/ioctl.h>
#include <sys/cdio.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/stat.h>

#include <isofs/cd9660/iso.h>
#include <isofs/cd9660/cd9660_extern.h>
#include <isofs/cd9660/iso_rrip.h>
#include <isofs/cd9660/cd9660_node.h>

const struct vfsops cd9660_vfsops = {
	.vfs_mount	= cd9660_mount,
	.vfs_start	= cd9660_start,
	.vfs_unmount	= cd9660_unmount,
	.vfs_root	= cd9660_root,
	.vfs_quotactl	= cd9660_quotactl,
	.vfs_statfs	= cd9660_statfs,
	.vfs_sync	= cd9660_sync,
	.vfs_vget	= cd9660_vget,
	.vfs_fhtovp	= cd9660_fhtovp,
	.vfs_vptofh	= cd9660_vptofh,
	.vfs_init	= cd9660_init,
	.vfs_sysctl	= (void *)eopnotsupp,
	.vfs_checkexp	= cd9660_check_export,
};

/*
 * Called by vfs_mountroot when iso is going to be mounted as root.
 */

static	int iso_mountfs(struct vnode *devvp, struct mount *mp,
	    struct proc *p, struct iso_args *argp);
int	iso_disklabelspoof(dev_t dev, void (*strat)(struct buf *),
	    struct disklabel *lp);

int
cd9660_mountroot(void)
{
	struct mount *mp;
	extern struct vnode *rootvp;
	struct proc *p = curproc;	/* XXX */
	int error;
	struct iso_args args;

	/*
	 * Get vnodes for swapdev and rootdev.
	 */
	if ((error = bdevvp(swapdev, &swapdev_vp)) ||
	    (error = bdevvp(rootdev, &rootvp))) {
		printf("cd9660_mountroot: can't setup bdevvp's");
                return (error);
        }

	if ((error = vfs_rootmountalloc("cd9660", "root_device", &mp)) != 0)
		return (error);
	args.flags = ISOFSMNT_ROOT;
	if ((error = iso_mountfs(rootvp, mp, p, &args)) != 0) {
		vfs_unbusy(mp);
		vfs_mount_free(mp);
                return (error);
        }

        TAILQ_INSERT_TAIL(&mountlist, mp, mnt_list);
        (void)cd9660_statfs(mp, &mp->mnt_stat, p);
	vfs_unbusy(mp);
	inittodr(0);

        return (0);
}

/*
 * VFS Operations.
 *
 * mount system call
 */
int
cd9660_mount(struct mount *mp, const char *path, void *data,
    struct nameidata *ndp, struct proc *p)
{
	struct iso_mnt *imp = NULL;
	struct iso_args *args = data;
	struct vnode *devvp;
	char fspec[MNAMELEN];
	int 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 && args->fspec == NULL)
			return (vfs_export(mp, &imp->im_export,
			    &args->export_info));
		return (0);
	}

	/*
	 * Not an update, or updating the name: look up the name
	 * and verify that it refers to a sensible block device.
	 */
	error = copyinstr(args->fspec, fspec, sizeof(fspec), NULL);
	if (error)
		return (error);
	NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec, p);
	if ((error = namei(ndp)) != 0)
		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);
	}

	bzero(mp->mnt_stat.f_mntonname, MNAMELEN);
	strlcpy(mp->mnt_stat.f_mntonname, path, MNAMELEN);
	bzero(mp->mnt_stat.f_mntfromname, MNAMELEN);
	strlcpy(mp->mnt_stat.f_mntfromname, fspec, MNAMELEN);
	bzero(mp->mnt_stat.f_mntfromspec, MNAMELEN);
	strlcpy(mp->mnt_stat.f_mntfromspec, fspec, MNAMELEN);
	bcopy(args, &mp->mnt_stat.mount_info.iso_args, sizeof(*args));

	cd9660_statfs(mp, &mp->mnt_stat, p);

	return (0);
}

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

	if (!ronly)
		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)) != 0)
		return (error);
	if (vcount(devvp) > 1 && devvp != rootvp)
		return (EBUSY);
	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
	error = vinvalbuf(devvp, V_SAVE, p->p_ucred, p, 0, INFSLP);
	VOP_UNLOCK(devvp);
	if (error)
		return (error);

	error = VOP_OPEN(devvp, ronly ? FREAD : FREAD|FWRITE, FSCRED, p);
	if (error)
		return (error);

	/*
	 * 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;

	if (argp->flags & ISOFSMNT_SESS) {
		sess = argp->sess;
		if (sess < 0)
			sess = 0;
	} else {
		sess = 0;
		error = VOP_IOCTL(devvp, CDIOREADMSADDR, (caddr_t)&sess, 0,
		    FSCRED, p);
		if (error)
			sess = 0;
	}

	joliet_level = 0;
	for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) {
		if ((error = bread(devvp,
		    (iso_blknum + sess) * btodb(iso_bsize),
		    iso_bsize, &bp)) != 0)
			goto out;

		vdp = (struct iso_volume_descriptor *)bp->b_data;
		if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) {
			error = EINVAL;
			goto out;
		}

		switch (isonum_711 (vdp->type)){
		case ISO_VD_PRIMARY:
			if (pribp == NULL) {
				pribp = bp;
				bp = NULL;
				pri = (struct iso_primary_descriptor *)vdp;
			}
			break;
		case ISO_VD_SUPPLEMENTARY:
			if (supbp == NULL) {
				supbp = bp;
				bp = NULL;
				sup = (struct iso_supplementary_descriptor *)vdp;

				if (!(argp->flags & ISOFSMNT_NOJOLIET)) {
					if (bcmp(sup->escape, "%/@", 3) == 0)
						joliet_level = 1;
					if (bcmp(sup->escape, "%/C", 3) == 0)
						joliet_level = 2;
					if (bcmp(sup->escape, "%/E", 3) == 0)
						joliet_level = 3;

					if (isonum_711 (sup->flags) & 1)
						joliet_level = 0;
				}
			}
			break;

		case ISO_VD_END:
			goto vd_end;

		default:
			break;
		}
		if (bp) {
			brelse(bp);
			bp = NULL;
		}
	}
    vd_end:
	if (bp) {
		brelse(bp);
		bp = NULL;
	}

	if (pri == NULL) {
		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;

	isomp = malloc(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);
	bcopy (rootp, isomp->root, sizeof isomp->root);
	isomp->root_extent = isonum_733 (rootp->extent);
	isomp->root_size = isonum_733 (rootp->size);
	isomp->joliet_level = 0;
	/*
	 * Since an ISO9660 multi-session CD can also access previous sessions,
	 * we have to include them into the space considerations.
	 */
	isomp->volume_space_size += sess;
	isomp->im_bmask = logical_block_size - 1;
	isomp->im_bshift = ffs(logical_block_size) - 1;

	brelse(pribp);
	pribp = NULL;

	mp->mnt_data = isomp;
	mp->mnt_stat.f_fsid.val[0] = (long)dev;
	mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum;
	mp->mnt_stat.f_namemax = NAME_MAX;
	mp->mnt_flag |= MNT_LOCAL;
	isomp->im_mountp = mp;
	isomp->im_dev = dev;
	isomp->im_devvp = devvp;

	/* Check the Rock Ridge Extension support */
	if (!(argp->flags & ISOFSMNT_NORRIP)) {
		if ((error = bread(isomp->im_devvp, (isomp->root_extent +
		    isonum_711(rootp->ext_attr_length)) <<
		    (isomp->im_bshift - DEV_BSHIFT),
		    isomp->logical_block_size, &bp)) != 0)
			goto out;

		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...
		 */
		brelse(bp);
		bp = NULL;
	}
	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) {
		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);
		isomp->joliet_level = joliet_level;
	}

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

	devvp->v_specmountpoint = mp;

	return (0);
out:
	if (devvp->v_specinfo)
		devvp->v_specmountpoint = NULL;
	if (bp)
		brelse(bp);
	if (supbp)
		brelse(supbp);

	vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
	VOP_CLOSE(devvp, ronly ? FREAD : FREAD|FWRITE, NOCRED, p);
	VOP_UNLOCK(devvp);

	if (isomp) {
		free((caddr_t)isomp, M_ISOFSMNT, 0);
		mp->mnt_data = NULL;
	}
	return (error);
}

/*
 * Test to see if the device is an ISOFS filesystem.
 */
int
iso_disklabelspoof(dev_t dev, void (*strat)(struct buf *), struct disklabel *lp)
{
	struct buf *bp = NULL;
	struct iso_volume_descriptor *vdp;
	struct iso_primary_descriptor *pri;
	int logical_block_size;
	int error = EINVAL;
	int iso_blknum;
	int i;

	bp = geteblk(ISO_DEFAULT_BLOCK_SIZE);
	bp->b_dev = dev;

	for (iso_blknum = 16; iso_blknum < 100; iso_blknum++) {
		bp->b_blkno = iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE);
		bp->b_bcount = ISO_DEFAULT_BLOCK_SIZE;
		CLR(bp->b_flags, B_READ | B_WRITE | B_DONE);
		SET(bp->b_flags, B_BUSY | B_READ | B_RAW);

		/*printf("d_secsize %d iso_blknum %d b_blkno %d bcount %d\n",
		    lp->d_secsize, iso_blknum, bp->b_blkno, bp->b_bcount);*/

		(*strat)(bp);

		if (biowait(bp))
			goto out;

		vdp = (struct iso_volume_descriptor *)bp->b_data;
		/*printf("%2x%2x%2x type %2x\n", vdp->id[0], vdp->id[1],
		    vdp->id[2], isonum_711(vdp->type));*/
		if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0 ||
		    isonum_711 (vdp->type) == ISO_VD_END)
			goto out;

		if (isonum_711 (vdp->type) == ISO_VD_PRIMARY)
			break;
	}

	if (isonum_711 (vdp->type) != ISO_VD_PRIMARY)
		goto out;

	pri = (struct iso_primary_descriptor *)vdp;
	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)
		goto out;

	/*
	 * build a disklabel for the CD
	 */
	strncpy(lp->d_typename, pri->volume_id, sizeof lp->d_typename);
	strncpy(lp->d_packname, pri->volume_id+16, sizeof lp->d_packname);
	for (i = 0; i < MAXPARTITIONS; i++) {
		DL_SETPSIZE(&lp->d_partitions[i], 0);
		DL_SETPOFFSET(&lp->d_partitions[i], 0);
	}
	DL_SETPOFFSET(&lp->d_partitions[0], 0);
	DL_SETPSIZE(&lp->d_partitions[0], DL_GETDSIZE(lp));
	lp->d_partitions[0].p_fstype = FS_ISO9660;
	DL_SETPOFFSET(&lp->d_partitions[RAW_PART], 0);
	DL_SETPSIZE(&lp->d_partitions[RAW_PART], DL_GETDSIZE(lp));
	lp->d_partitions[RAW_PART].p_fstype = FS_ISO9660;
	lp->d_npartitions = MAXPARTITIONS;
	lp->d_version = 1;

	lp->d_magic = DISKMAGIC;
	lp->d_magic2 = DISKMAGIC;
	lp->d_checksum = dkcksum(lp);
	error = 0;
out:
	bp->b_flags |= B_INVAL;
	brelse(bp);
	return (error);
}

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

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

	if (mntflags & MNT_FORCE)
		flags |= FORCECLOSE;
#if 0
	mntflushbuf(mp, 0);
	if (mntinvalbuf(mp))
		return (EBUSY);
#endif
	if ((error = vflush(mp, NULLVP, flags)) != 0)
		return (error);

	isomp = VFSTOISOFS(mp);

	isomp->im_devvp->v_specmountpoint = NULL;
	vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY);
	(void)VOP_CLOSE(isomp->im_devvp, FREAD, NOCRED, p);
	vput(isomp->im_devvp);
	free((caddr_t)isomp, M_ISOFSMNT, 0);
	mp->mnt_data = NULL;
	mp->mnt_flag &= ~MNT_LOCAL;
	return (0);
}

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

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

	return (EOPNOTSUPP);
}

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

	isomp = VFSTOISOFS(mp);

	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 */
	sbp->f_favail = 0; /* file nodes free for non superuser */
	copy_statfs_info(sbp, mp);

	return (0);
}

int
cd9660_sync(struct mount *mp, int waitfor, int stall, 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;
};

int
cd9660_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp)
{
	struct ifid *ifhp = (struct ifid *)fhp;
	struct iso_node *ip;
	struct vnode *nvp;
	int error;

#ifdef	ISOFS_DBG
	printf("fhtovp: ino %d, start %ld\n", ifhp->ifid_ino,
	    ifhp->ifid_start);
#endif

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

int
cd9660_vget(struct mount *mp, ino_t ino, struct vnode **vpp)
{

	if (ino > (cdino_t)-1)
		panic("cd9660_vget: alien ino_t %llu",
		    (unsigned long long)ino);

	/*
	 * 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, vpp,
#if 0
	    VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
#else
	    0,
#endif
	    NULL));
}

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

retry:
	imp = VFSTOISOFS(mp);
	dev = imp->im_dev;
	if ((*vpp = cd9660_ihashget(dev, ino)) != NULLVP)
		return (0);

	/* Allocate a new vnode/iso_node. */
	if ((error = getnewvnode(VT_ISOFS, mp, &cd9660_vops, &vp)) != 0) {
		*vpp = NULLVP;
		return (error);
	}
	ip = malloc(sizeof(*ip), M_ISOFSNODE, M_WAITOK | M_ZERO);
	rrw_init_flags(&ip->i_lock, "isoinode", RWL_DUPOK | RWL_IS_VNODE);
	vp->v_data = ip;
	ip->i_vnode = vp;
	ip->i_dev = dev;
	ip->i_number = ino;

	/*
	 * 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.
	 */
	error = cd9660_ihashins(ip);

	if (error) {
		vrele(vp);

		if (error == EEXIST)
			goto retry;

		return (error);
	}

	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->im_bshift - DEV_BSHIFT),
			      imp->logical_block_size, &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);
		}

#if 0
		if (isonum_733(isodir->extent) +
		    isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) {
			if (bp != 0)
				brelse(bp);
			printf("fhtovp: file start miss %d vs %d\n",
			    isonum_733(isodir->extent) +
			    isonum_711(isodir->ext_attr_length),
			    ifhp->ifid_start);
			return (ESTALE);
		}
#endif
	} 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 = cd9660_bufatoff(ip, (off_t)0, NULL, &bp)) != 0) {
			vput(vp);
			return (error);
		}
		isodir = (struct iso_directory_record *)bp->b_data;
	}

	ip->iso_extent = isonum_733(isodir->extent);
	ip->i_size = (u_int32_t) isonum_733(isodir->size);
	ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;

	/*
	 * 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)))
			cd9660_bufatoff(ip, (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
	 */
	switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
	case VFIFO:
#ifdef	FIFO
		vp->v_op = &cd9660_fifovops;
		break;
#else
		vput(vp);
		return (EOPNOTSUPP);
#endif	/* FIFO */
	case VCHR:
	case VBLK:
		/*
		 * if device, look at device number table for translation
		 */
		vp->v_op = &cd9660_specvops;
		if ((nvp = checkalias(vp, ip->inode.iso_rdev, mp)) != NULL) {
			/*
			 * Discard unneeded vnode, but save its iso_node.
			 * Note that the lock is carried over in the iso_node
			 */
			nvp->v_data = vp->v_data;
			vp->v_data = NULL;
			vp->v_op = &spec_vops;
			vrele(vp);
			vgone(vp);
			/*
			 * Reinitialize aliased inode.
			 */
			vp = nvp;
			ip->i_vnode = vp;
		}
		break;
	case VLNK:
	case VNON:
	case VSOCK:
	case VDIR:
	case VBAD:
		break;
	case VREG:
		uvm_vnp_setsize(vp, ip->i_size);
		break;
	}

	if (ip->iso_extent == imp->root_extent)
		vp->v_flag |= VROOT;

	/*
	 * XXX need generation number?
	 */

	*vpp = vp;
	return (0);
}

/*
 * Vnode pointer to File handle
 */
int
cd9660_vptofh(struct vnode *vp, struct fid *fhp)
{
	struct iso_node *ip = VTOI(vp);
	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);
}

/*
 * Verify a remote client has export rights and return these rights via
 * exflagsp and credanonp.
 */
int
cd9660_check_export(struct mount *mp, struct mbuf *nam, int *exflagsp,
    struct ucred **credanonp)
{
	struct netcred *np;
	struct iso_mnt *imp = VFSTOISOFS(mp);

	/*
	 * Get the export permission structure for this <mp, client> tuple.
	 */
	np = vfs_export_lookup(mp, &imp->im_export, nam);
	if (np == NULL)
		return (EACCES);

	*exflagsp = np->netc_exflags;
	*credanonp = &np->netc_anon;
	return (0);
}