/*-
 * 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     8.18 (Berkeley) 5/22/95
 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vfsops.c,v 1.74.2.7 2002/04/08 09:39:29 bde Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/proc.h>
#include <sys/caps.h>
#include <sys/nlookup.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/cdio.h>
#include <sys/conf.h>
#include <sys/fcntl.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/syslog.h>
#include <sys/iconv.h>

#include <vm/vm_zone.h>

#include <sys/buf2.h>

#include "iso.h"
#include "iso_rrip.h"
#include "cd9660_node.h"
#include "cd9660_mount.h"

extern struct vop_ops cd9660_vnode_vops;
extern struct vop_ops cd9660_spec_vops;
extern struct vop_ops cd9660_fifo_vops;

MALLOC_DEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure");
MALLOC_DEFINE(M_ISOFSNODE, "ISOFS node", "ISOFS vnode private part");

struct iconv_functions *cd9660_iconv = NULL;

static int cd9660_mount(struct mount *, char *, caddr_t, struct ucred *);
static int cd9660_unmount(struct mount *, int);
static int cd9660_root(struct mount *, struct vnode **);
static int cd9660_statfs(struct mount *, struct statfs *, struct ucred *);
static int cd9660_vget(struct mount *, struct vnode *, ino_t, struct vnode **);
static int cd9660_fhtovp(struct mount *, struct vnode *rootvp,
                         struct fid *, struct vnode **);
static int cd9660_checkexp(struct mount *, struct sockaddr *,
                           int *, struct ucred **);
static int cd9660_vptofh (struct vnode *, struct fid *);

static struct vfsops cd9660_vfsops = {
        .vfs_flags =            0,
        .vfs_mount =            cd9660_mount,
        .vfs_unmount =          cd9660_unmount,
        .vfs_root =             cd9660_root,
        .vfs_statfs =           cd9660_statfs,
        .vfs_vget =             cd9660_vget,
        .vfs_fhtovp =           cd9660_fhtovp,
        .vfs_checkexp =         cd9660_checkexp,
        .vfs_vptofh =           cd9660_vptofh,
        .vfs_init =             cd9660_init,
        .vfs_uninit =           cd9660_uninit,
};
VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY);
MODULE_VERSION(cd9660, 1);


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

static int iso_get_ssector(cdev_t dev);
static int iso_mountfs(struct vnode *devvp, struct mount *mp,
                       struct iso_args *argp);

/*
 * Try to find the start of the last data track on this CD-ROM.  This
 * is used to mount the last session of a multi-session CD.  Bail out
 * and return 0 if we fail, this is always a safe bet.
 */
static int
iso_get_ssector(cdev_t dev)
{
        struct ioc_toc_header h;
        struct ioc_read_toc_single_entry t;
        int i;

        if (dev_dioctl(dev, CDIOREADTOCHEADER, (caddr_t)&h, FREAD,
                       proc0.p_ucred, NULL, NULL) != 0)
                return 0;

        for (i = h.ending_track; i >= 0; i--) {
                t.address_format = CD_LBA_FORMAT;
                t.track = i;
                if (dev_dioctl(dev, CDIOREADTOCENTRY, (caddr_t)&t, FREAD,
                               proc0.p_ucred, NULL, NULL) != 0) {
                        return 0;
                }
                if ((t.entry.control & 4) != 0)
                        /* found a data track */
                        break;
        }

        if (i < 0)
                return 0;

        return ntohl(t.entry.addr.lba);
}

static int
iso_mountroot(struct mount *mp)
{
        struct iso_args args;
        struct vnode *rootvp;
        int error;

        if ((error = bdevvp(rootdev, &rootvp))) {
                kprintf("iso_mountroot: can't find rootvp\n");
                return (error);
        }
        args.flags = ISOFSMNT_ROOT;

        vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
        error = VOP_OPEN(rootvp, FREAD, FSCRED, NULL);
        vn_unlock(rootvp);
        if (error)
                return (error);

        args.ssector = iso_get_ssector(rootdev);

        vn_lock(rootvp, LK_EXCLUSIVE | LK_RETRY);
        VOP_CLOSE(rootvp, FREAD, NULL);
        vn_unlock(rootvp);

        if (bootverbose)
                kprintf("iso_mountroot(): using session at block %d\n",
                       args.ssector);
        if ((error = iso_mountfs(rootvp, mp, &args)) != 0)
                return (error);

        cd9660_statfs(mp, &mp->mnt_stat, proc0.p_ucred);
        return (0);
}

/*
 * VFS Operations.
 *
 * mount system call
 */
static int
cd9660_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred)
{
        struct vnode *devvp;
        struct iso_args args;
        size_t size;
        int error;
        mode_t accessmode;
        struct iso_mnt *imp = NULL;
        struct nlookupdata nd;

        if ((mp->mnt_flag & (MNT_ROOTFS|MNT_UPDATE)) == MNT_ROOTFS) {
                return (iso_mountroot(mp));
        }
        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 == NULL)
                        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.
         */
        devvp = NULL;
        error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW);
        if (error == 0)
                error = nlookup(&nd);
        if (error == 0)
                error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp);
        nlookup_done(&nd);
        if (error)
                return (error);

        if (!vn_isdisk(devvp, &error)) {
                vrele(devvp);
                return (error);
        }

        /*
         * Verify that user has necessary permissions on the device,
         * or has superuser abilities
         */
        accessmode = VREAD;
        vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
        error = VOP_EACCESS(devvp, accessmode, cred);
        if (error)
                error = caps_priv_check(cred, SYSCAP_RESTRICTEDROOT);
        if (error) {
                vput(devvp);
                return (error);
        }
        vn_unlock(devvp);

        if ((mp->mnt_flag & MNT_UPDATE) == 0) {
                error = iso_mountfs(devvp, mp, &args);
        } else {
                if (devvp != imp->im_devvp)
                        error = EINVAL; /* needs translation */
                else
                        vrele(devvp);
        }
        if (error) {
                vrele(devvp);
                return error;
        }
        imp = VFSTOISOFS(mp);
        copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1,
            &size);
        bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size);
        cd9660_statfs(mp, &mp->mnt_stat, cred);
        return 0;
}

/*
 * Common code for mount and mountroot
 */
static int
iso_mountfs(struct vnode *devvp, struct mount *mp, struct iso_args *argp)
{
        struct iso_mnt *isomp = NULL;
        struct buf *bp = NULL;
        struct buf *pribp = NULL, *supbp = NULL;
        cdev_t dev;
        int error = EINVAL;
        int needclose = 0;
        int high_sierra = 0;
        int iso_bsize;
        int iso_blknum;
        int joliet_level;
        struct iso_volume_descriptor *vdp = NULL;
        struct iso_primary_descriptor *pri = NULL;
        struct iso_sierra_primary_descriptor *pri_sierra = NULL;
        struct iso_supplementary_descriptor *sup = NULL;
        struct iso_directory_record *rootp;
        int logical_block_size;
        char cs_local[ICONV_CSNMAXLEN];
        char cs_disk[ICONV_CSNMAXLEN];

        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
         * Flush out any old buffers remaining from a previous use.
         */
        if ((error = vfs_mountedon(devvp)))
                return error;
        if (vcount(devvp) > 0)
                return EBUSY;
        if ((error = vinvalbuf(devvp, V_SAVE, 0, 0)))
                return (error);

        vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
        error = VOP_OPEN(devvp, FREAD, FSCRED, NULL);
        vn_unlock(devvp);
        if (error)
                return error;
        dev = devvp->v_rdev;
        if (dev->si_iosize_max != 0)
                mp->mnt_iosize_max = dev->si_iosize_max;
        if (mp->mnt_iosize_max > MAXPHYS)
                mp->mnt_iosize_max = MAXPHYS;

        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;

        joliet_level = 0;
        for (iso_blknum = 16 + argp->ssector;
             iso_blknum < 100 + argp->ssector;
             iso_blknum++) {
                if ((error = bread(devvp, (off_t)iso_blknum * 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) {
                        if (bcmp (vdp->id_sierra, ISO_SIERRA_ID,
                                  sizeof vdp->id) != 0) {
                                error = EINVAL;
                                goto out;
                        } else
                                high_sierra = 1;
                }
                switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){
                case ISO_VD_PRIMARY:
                        if (pribp == NULL) {
                                pribp = bp;
                                bp = NULL;
                                pri = (struct iso_primary_descriptor *)vdp;
                                pri_sierra =
                                  (struct iso_sierra_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) &&
                                            (argp->flags & ISOFSMNT_BROKENJOLIET) == 0)
                                                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 (high_sierra?
                            pri_sierra->logical_block_size:
                            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 *)
                (high_sierra?
                 pri_sierra->root_directory_record:
                 pri->root_directory_record);

        isomp = kmalloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO);
        isomp->logical_block_size = logical_block_size;
        isomp->volume_space_size =
                isonum_733 (high_sierra?
                            pri_sierra->volume_space_size:
                            pri->volume_space_size);
        isomp->joliet_level = 0;
        /*
         * 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 += argp->ssector;
        bcopy (rootp, isomp->root, sizeof isomp->root);
        isomp->root_extent = isonum_733 (rootp->extent);
        isomp->root_size = isonum_733 (rootp->size);

        isomp->im_bmask = logical_block_size - 1;
        isomp->im_bshift = ffs(logical_block_size) - 1;

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

        mp->mnt_data = (qaddr_t)isomp;
        mp->mnt_stat.f_fsid.val[0] = devid_from_dev(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;
        /* Use ALLPERMS to include the setuid/setgid/sticky permissions. */
        isomp->im_fmask = isomp->im_dmask = ALLPERMS;

        dev->si_mountpoint = mp;

        if (argp->flags & ISOFSMNT_UID)
                isomp->im_uid = argp->uid;
        if (argp->flags & ISOFSMNT_GID)
                isomp->im_gid = argp->gid;
        if (argp->flags & ISOFSMNT_MODEMASK) {
                if (argp->fmask > 0)
                        isomp->im_fmask &= argp->fmask;
                if (argp->dmask > 0)
                        isomp->im_dmask &= argp->dmask;
        }

        /* Check the Rock Ridge Extension support */
        if (!(argp->flags & ISOFSMNT_NORRIP)) {
                if ((error = bread(isomp->im_devvp,
                                  lblktooff(isomp, isomp->root_extent + isonum_711(rootp->ext_attr_length)),
                                  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...
                 */
                bp->b_flags |= B_AGE;
                brelse(bp);
                bp = NULL;
        }
        isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
                                         ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET |
                                         ISOFSMNT_KICONV |
                                         ISOFSMNT_UID | ISOFSMNT_GID);

        if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
                bcopy(argp->cs_local, cs_local, sizeof(cs_local));
                bcopy(argp->cs_disk, cs_disk, sizeof(cs_disk));
                cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l);
                cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d);
        } else {
                isomp->im_d2l = NULL;
                isomp->im_l2d = NULL;
        }

        if (high_sierra) {
                /* this effectively ignores all the mount flags */
                log(LOG_INFO, "cd9660: High Sierra Format\n");
                isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA;
        } else {
                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:
                          log(LOG_INFO, "cd9660: RockRidge Extension\n");
                          isomp->iso_ftype = ISO_FTYPE_RRIP;
                          break;
                }
        }

        /* Decide whether to use the Joliet descriptor */

        if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) {
                log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", 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;
                supbp->b_flags |= B_AGE;
        }

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

        vfs_add_vnodeops(mp, &cd9660_vnode_vops, &mp->mnt_vn_norm_ops);
        vfs_add_vnodeops(mp, &cd9660_spec_vops, &mp->mnt_vn_spec_ops);
        vfs_add_vnodeops(mp, &cd9660_fifo_vops, &mp->mnt_vn_fifo_ops);

        return 0;
out:
        dev->si_mountpoint = NULL;
        if (bp)
                brelse(bp);
        if (pribp)
                brelse(pribp);
        if (supbp)
                brelse(supbp);
        if (needclose) {
                vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
                VOP_CLOSE(devvp, FREAD, NULL);
                vn_unlock(devvp);
        }
        if (isomp) {
                kfree((caddr_t)isomp, M_ISOFSMNT);
                mp->mnt_data = (qaddr_t)0;
        }
        return error;
}

/*
 * unmount system call
 */
static int
cd9660_unmount(struct mount *mp, int mntflags)
{
        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, 0, flags)))
                return (error);

        isomp = VFSTOISOFS(mp);

        if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) {
                if (isomp->im_d2l)
                        cd9660_iconv->close(isomp->im_d2l);
                if (isomp->im_l2d)
                        cd9660_iconv->close(isomp->im_l2d);
        }

        isomp->im_devvp->v_rdev->si_mountpoint = NULL;
        vn_lock(isomp->im_devvp, LK_EXCLUSIVE | LK_RETRY);
        error = VOP_CLOSE(isomp->im_devvp, FREAD, NULL);
        vn_unlock(isomp->im_devvp);
        vrele(isomp->im_devvp);
        kfree((caddr_t)isomp, M_ISOFSMNT);
        mp->mnt_data = (qaddr_t)0;
        mp->mnt_flag &= ~MNT_LOCAL;
        return (error);
}

/*
 * Return root of a filesystem
 */
static 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;
        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));
}

/*
 * Get filesystem statistics.
 */
int
cd9660_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred)
{
        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 */
        if (sbp != &mp->mnt_stat) {
                sbp->f_type = mp->mnt_vfc->vfc_typenum;
                bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN);
        }
        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(struct mount *mp, struct vnode *rootvp,
              struct fid *fhp, struct vnode **vpp)
{
        struct ifid *ifhp = (struct ifid *)fhp;
        struct iso_node *ip;
        struct vnode *nvp;
        int error;

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

        if ((error = VFS_VGET(mp, NULL, 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_checkexp(struct mount *mp, struct sockaddr *nam, int *exflagsp,
                struct ucred **credanonp)
{
        struct netcred *np;
        struct iso_mnt *imp;

        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);
}

int
cd9660_vget(struct mount *mp, struct vnode *dvp, ino_t 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, vpp,
#if 0
            VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP,
#else
            0,
#endif
            NULL));
}

int
cd9660_vget_internal(struct mount *mp, ino_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;
        cdev_t dev;
        int error;

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

        /* Allocate a new vnode/iso_node. */
        error = getnewvnode(VT_ISOFS, mp, &vp, 0, 0);
        if (error) {
                *vpp = NULLVP;
                return (error);
        }
        ip = kmalloc(sizeof(struct iso_node), M_ISOFSNODE, M_WAITOK | M_ZERO);
        ip->i_vnode = vp;
        ip->i_dev = dev;
        ip->i_number = ino;

        /*
         * Insert it into the inode hash table and check for a collision.
         * If a collision occurs, throw away the vnode and try again.
         */
        if (cd9660_ihashins(ip) != 0) {
                kprintf("debug: cd9660 ihashins collision, retrying\n");
                vx_put(vp);
                kfree(ip, M_ISOFSNODE);
                goto again;
        }
        vp->v_data = ip;

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

                lbn = lblkno(imp, ino);
                if (lbn >= imp->volume_space_size) {
                        vx_put(vp);
                        kprintf("fhtovp: lbn exceed volume space %d\n", lbn);
                        return (ESTALE);
                }

                off = blkoff(imp, ino);
                if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
                        vx_put(vp);
                        kprintf("fhtovp: crosses block boundary %d\n",
                               off + ISO_DIRECTORY_RECORD_SIZE);
                        return (ESTALE);
                }

                error = bread(imp->im_devvp,
                              lblktooff(imp, lbn),
                              imp->logical_block_size, &bp);
                if (error) {
                        vx_put(vp);
                        brelse(bp);
                        kprintf("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) {
                        vx_put(vp);
                        if (bp != NULL)
                                brelse(bp);
                        kprintf("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 != NULL)
                                brelse(bp);
                        kprintf("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 = NULL;

        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 != NULL)
                        brelse(bp);
                if ((error = cd9660_devblkatoff(vp, (off_t)0, NULL, &bp)) != 0) {
                        vx_put(vp);
                        return (error);
                }
                isodir = (struct iso_directory_record *)bp->b_data;
        }

        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;

        /*
         * 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_devblkatoff(vp, (off_t)-(off << imp->im_bshift), NULL,
                                     &bp2);
                else
                        bp2 = NULL;
                cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660);
                cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660);
                if (bp2)
                        brelse(bp2);
                break;
            }
        case ISO_FTYPE_RRIP:
                cd9660_rrip_analyze(isodir, ip, imp);
                break;
        }

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

        /*
         * Initialize the associated vnode
         */
        vp->v_type = IFTOVT(ip->inode.iso_mode);

        switch (vp->v_type) {
        case VFIFO:
                vp->v_ops = &mp->mnt_vn_fifo_ops;
                break;
        case VCHR:
        case VBLK:
                vp->v_ops = &mp->mnt_vn_spec_ops;
                addaliasu(vp, umajor(ip->inode.iso_rdev),
                          uminor(ip->inode.iso_rdev));
                break;
        case VREG:
        case VDIR:
                vinitvmio(vp, ip->i_size, PAGE_SIZE, -1);
                break;
        default:
                break;
        }

        if (ip->iso_extent == imp->root_extent)
                vsetflags(vp, VROOT);

        /*
         * Return the locked and refd vp
         */
        vx_downgrade(vp);
        *vpp = vp;
        return (0);
}

/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
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
        kprintf("vptofh: ino %d, start %ld\n",
               ifhp->ifid_ino,ifhp->ifid_start);
#endif
        return 0;
}