/*      $NetBSD: cd9660_vfsops.c,v 1.106 2025/11/29 21:45:57 mlelstv 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     8.18 (Berkeley) 5/22/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cd9660_vfsops.c,v 1.106 2025/11/29 21:45:57 mlelstv Exp $");

#if defined(_KERNEL_OPT)
#include "opt_compat_netbsd.h"
#endif

#include <sys/param.h>
#include <sys/sysctl.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/vnode.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>
#include <sys/mount.h>
#include <sys/buf.h>
#include <sys/file.h>
#include <sys/disklabel.h>
#include <sys/device.h>
#include <sys/ioctl.h>
#include <sys/cdio.h>
#include <sys/errno.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/stat.h>
#include <sys/conf.h>
#include <sys/dirent.h>
#include <sys/kauth.h>
#include <sys/module.h>

#include <fs/cd9660/iso.h>
#include <fs/cd9660/cd9660_extern.h>
#include <fs/cd9660/iso_rrip.h>
#include <fs/cd9660/cd9660_node.h>
#include <fs/cd9660/cd9660_mount.h>

MODULE(MODULE_CLASS_VFS, cd9660, NULL);

MALLOC_JUSTDEFINE(M_ISOFSMNT, "ISOFS mount", "ISOFS mount structure");

extern const struct vnodeopv_desc cd9660_vnodeop_opv_desc;
extern const struct vnodeopv_desc cd9660_specop_opv_desc;
extern const struct vnodeopv_desc cd9660_fifoop_opv_desc;

const struct vnodeopv_desc * const cd9660_vnodeopv_descs[] = {
        &cd9660_vnodeop_opv_desc,
        &cd9660_specop_opv_desc,
        &cd9660_fifoop_opv_desc,
        NULL,
};

struct vfsops cd9660_vfsops = {
        .vfs_name = MOUNT_CD9660,
        .vfs_min_mount_data = sizeof (struct iso_args),
        .vfs_mount = cd9660_mount,
        .vfs_start = cd9660_start,
        .vfs_unmount = cd9660_unmount,
        .vfs_root = cd9660_root,
        .vfs_quotactl = (void *)eopnotsupp,
        .vfs_statvfs = cd9660_statvfs,
        .vfs_sync = cd9660_sync,
        .vfs_vget = cd9660_vget,
        .vfs_loadvnode = cd9660_loadvnode,
        .vfs_fhtovp = cd9660_fhtovp,
        .vfs_vptofh = cd9660_vptofh,
        .vfs_init = cd9660_init,
        .vfs_reinit = cd9660_reinit,
        .vfs_done = cd9660_done,
        .vfs_mountroot = cd9660_mountroot,
        .vfs_snapshot = (void *)eopnotsupp,
        .vfs_extattrctl = vfs_stdextattrctl,
        .vfs_suspendctl = genfs_suspendctl,
        .vfs_renamelock_enter = genfs_renamelock_enter,
        .vfs_renamelock_exit = genfs_renamelock_exit,
        .vfs_fsync = (void *)eopnotsupp,
        .vfs_opv_descs = cd9660_vnodeopv_descs
};

static const struct genfs_ops cd9660_genfsops = {
        .gop_size = genfs_size,
};

/*
 * Called by vfs_mountroot when iso is going to be mounted as root.
 *
 * Name is updated by mount(8) after booting.
 */
static int iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len);
static int iso_mountfs(struct vnode *devvp, struct mount *mp,
                struct lwp *l, struct iso_args *argp);

SYSCTL_SETUP(cd9660_sysctl_setup, "cd9660 sysctl")
{

                sysctl_createv(clog, 0, NULL, NULL,
                               CTLFLAG_PERMANENT, CTLTYPE_NODE, "cd9660",
                               SYSCTL_DESCR("ISO-9660 file system"),
                               NULL, 0, NULL, 0,
                               CTL_VFS, 14, CTL_EOL);
                sysctl_createv(clog, 0, NULL, NULL,
                               CTLFLAG_PERMANENT|CTLFLAG_READWRITE,
                               CTLTYPE_INT, "utf8_joliet",
                               SYSCTL_DESCR("Encode Joliet filenames to UTF-8"),
                               NULL, 0, &cd9660_utf8_joliet, 0,
                               CTL_VFS, 14, CD9660_UTF8_JOLIET, CTL_EOL);
                /*
                 * XXX the "14" above could be dynamic, thereby eliminating
                 * one more instance of the "number to vfs" mapping problem,
                 * but "14" is the order as taken from sys/mount.h
                 */
}

static int
cd9660_modcmd(modcmd_t cmd, void *arg)
{
        int error;

        switch (cmd) {
        case MODULE_CMD_INIT:
                error = vfs_attach(&cd9660_vfsops);
                break;
        case MODULE_CMD_FINI:
                error = vfs_detach(&cd9660_vfsops);
                break;
        default:
                error = ENOTTY;
                break;
        }

        return (error);
}

/* Compat with pre uid/gid/fsize/dsize mount call */
#define OSIZE sizeof(struct { \
        const char *fspec; \
        struct export_args30 _pad1; \
        int flags; \
})

static int
iso_checkupdate(const struct vnode *devvp, const struct iso_mnt *imp,
    const struct iso_args *args)
{

        if (devvp != imp->im_devvp && devvp->v_rdev != imp->im_devvp->v_rdev)
                return EINVAL;

        if (((imp->im_flags & ISOFSMNT_UID) && args->uid != imp->im_uid) ||
            ((imp->im_flags & ISOFSMNT_GID) && args->gid != imp->im_gid) ||
            args->fmask != imp->im_fmask || args->dmask != imp->im_dmask)
                return EPERM;

        return 0;
}

static void
iso_copyidmask(struct iso_args *args, const struct iso_mnt *imp)
{

        if (imp == NULL) {
                args->uid = args->gid = 0;
                args->fmask = args->dmask = S_IRWXU|S_IRWXG|S_IRWXO;
                return;
        }
        args->uid = imp->im_uid;
        args->gid = imp->im_gid;
        args->fmask = imp->im_fmask;
        args->dmask = imp->im_dmask;
}

int
cd9660_mountroot(void)
{
        struct mount *mp;
        struct lwp *l = curlwp;
        int error;
        struct iso_args args;

        if (device_class(root_device) != DV_DISK)
                return (ENODEV);

        if ((error = vfs_rootmountalloc(MOUNT_CD9660, "root_device", &mp))
                        != 0) {
                vrele(rootvp);
                return (error);
        }

        args.flags = ISOFSMNT_ROOT;
        iso_copyidmask(&args, NULL);
        if ((error = iso_mountfs(rootvp, mp, l, &args)) != 0) {
                vfs_unbusy(mp);
                vfs_rele(mp);
                return (error);
        }
        mountlist_append(mp);
        (void)cd9660_statvfs(mp, &mp->mnt_stat);
        vfs_unbusy(mp);
        return (0);
}

    
/*
 * VFS Operations.
 *
 * mount system call
 */

int
cd9660_mount(struct mount *mp, const char *path, void *data, size_t *data_len)
{
        struct lwp *l = curlwp;
        struct vnode *devvp;
        struct iso_args aa, *args = data;
        int error;
        struct iso_mnt *imp = VFSTOISOFS(mp);

        if (args == NULL)
                return EINVAL;

        if (*data_len != OSIZE && *data_len < sizeof(*args))
                return EINVAL;

        if (mp->mnt_flag & MNT_GETARGS) {
                if (imp == NULL)
                        return EIO;

                args->fspec = NULL;
                args->flags = imp->im_flags;
                if (*data_len == OSIZE)
                        return 0;

                iso_copyidmask(args, imp);
                *data_len = sizeof(*args);
                return 0;
        }

        if (*data_len == OSIZE) {
                memcpy(&aa, args, OSIZE);
                args = &aa;
                iso_copyidmask(args, (mp->mnt_flag & MNT_UPDATE) ? imp : NULL);
        }

        if ((mp->mnt_flag & MNT_RDONLY) == 0)
                return EROFS;

        if ((mp->mnt_flag & MNT_UPDATE) && args->fspec == NULL)
                return EINVAL;

        /*
         * Not an update, or updating the name: look up the name
         * and verify that it refers to a sensible block device.
         */
        error = namei_simple_user(args->fspec,
            NSM_FOLLOW_NOEMULROOT, &devvp);
        if (error != 0)
                return error;

        if (devvp->v_type != VBLK) {
                vrele(devvp);
                return ENOTBLK;
        }
        if (bdevsw_lookup(devvp->v_rdev) == NULL) {
                vrele(devvp);
                return ENXIO;
        }
        /*
         * If mount by non-root, then verify that user has necessary
         * permissions on the device.
         */
        vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
        error = kauth_authorize_system(l->l_cred, KAUTH_SYSTEM_MOUNT,
            KAUTH_REQ_SYSTEM_MOUNT_DEVICE, mp, devvp, KAUTH_ARG(VREAD));
        if (error) {
                goto fail;
        }
        if ((mp->mnt_flag & MNT_UPDATE) == 0) {
                error = VOP_OPEN(devvp, FREAD, FSCRED);
                if (error)
                        goto fail;
                VOP_UNLOCK(devvp);
                error = iso_mountfs(devvp, mp, l, args);
                vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
                if (error) {
                        (void)VOP_CLOSE(devvp, FREAD, NOCRED);
                        goto fail;
                }
                VOP_UNLOCK(devvp);
                /* reference to devvp is donated through iso_mountfs */
        } else {
                if ((error = iso_checkupdate(devvp, imp, args)) != 0)
                        goto fail;
                VOP_UNLOCK(devvp);
                vrele(devvp);
        }
        return set_statvfs_info(path, UIO_USERSPACE, args->fspec, UIO_USERSPACE,
            mp->mnt_op->vfs_name, mp, l);

fail:
        VOP_UNLOCK(devvp);
        vrele(devvp);
        return error;
}

/*
 * Make a mount point from a volume descriptor
 */
static int
iso_makemp(struct iso_mnt *isomp, struct buf *bp, int *ea_len)
{
        struct iso_primary_descriptor *pri;
        int logical_block_size;
        struct iso_directory_record *rootp;

        pri = (struct iso_primary_descriptor *)bp->b_data;

        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)
                return -1;

        rootp = (struct iso_directory_record *)pri->root_directory_record;

        isomp->logical_block_size = logical_block_size;
        isomp->volume_space_size = isonum_733 (pri->volume_space_size);
        memcpy(isomp->root, rootp, sizeof(isomp->root));
        isomp->root_extent = isonum_733 (rootp->extent);
        isomp->root_size = isonum_733 (rootp->size);
        isomp->im_joliet_level = 0;

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

        if (ea_len != NULL)
                *ea_len = isonum_711(rootp->ext_attr_length);

        return 0;
}

/*
 * Common code for mount and mountroot
 */
static int
iso_mountfs(struct vnode *devvp, struct mount *mp, struct lwp *l,
        struct iso_args *argp)
{
        struct iso_mnt *isomp = (struct iso_mnt *)0;
        struct buf *bp = NULL, *pribp = NULL, *supbp = NULL;
        dev_t dev = devvp->v_rdev;
        int error = EINVAL;
        int ronly = (mp->mnt_flag & MNT_RDONLY) != 0;
        int iso_bsize;
        int iso_blknum;
        int joliet_level;
        struct iso_volume_descriptor *vdp;
        struct iso_supplementary_descriptor *sup;
        int sess = 0;
        int ext_attr_length;
        struct disklabel label;

        if (!ronly)
                return EROFS;

        /* Flush out any old buffers remaining from a previous use. */
        vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY);
        error = vinvalbuf(devvp, V_SAVE, l->l_cred, l, 0, 0);
        VOP_UNLOCK(devvp);
        if (error != 0)
                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;

        error = VOP_IOCTL(devvp, DIOCGDINFO, &label, FREAD, FSCRED);
        if (!error) {
                /* XXX more sanity checks? */
                if (label.d_partitions[DISKPART(dev)].p_fstype == FS_ISO9660)
                        sess = label.d_partitions[DISKPART(dev)].p_cdsession;
        } else {
                /* fallback to old method */
                error = VOP_IOCTL(devvp, CDIOREADMSADDR, &sess, 0, FSCRED);
                if (error)
                        sess = 0;       /* never mind */
        }
#ifdef ISO_DEBUG
        printf("isofs: session offset (part %"PRId32") %d\n", DISKPART(dev), sess);
#endif

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

                vdp = (struct iso_volume_descriptor *)bp->b_data;
                if (memcmp(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;
                        }
                        break;

                case ISO_VD_SUPPLEMENTARY:
                        if (supbp == NULL) {
                                supbp = bp;
                                bp = NULL;
                        }
                        break;

                default:
                        break;
                }

                if (isonum_711 (vdp->type) == ISO_VD_END) {
                        brelse(bp, 0);
                        bp = NULL;
                        break;
                }

                if (bp != NULL) {
                        brelse(bp, 0);
                        bp = NULL;
                }
        }

        if (pribp == NULL) {
                error = EINVAL;
                goto out;
        }

        isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK);
        memset(isomp, 0, sizeof *isomp);
        if (iso_makemp(isomp, pribp, &ext_attr_length) == -1) {
                error = EINVAL;
                goto out;
        }

        isomp->volume_space_size += sess;

        brelse(pribp, BC_AGE);
        pribp = NULL;

        mp->mnt_data = isomp;
        mp->mnt_stat.f_fsidx.__fsid_val[0] = (long)dev;
        mp->mnt_stat.f_fsidx.__fsid_val[1] = makefstype(MOUNT_CD9660);
        mp->mnt_stat.f_fsid = mp->mnt_stat.f_fsidx.__fsid_val[0];
        mp->mnt_stat.f_namemax = ISO_MAXNAMLEN;
        mp->mnt_flag |= MNT_LOCAL;
        mp->mnt_iflag |= IMNT_MPSAFE | IMNT_SHRLOOKUP;
        mp->mnt_dev_bshift = iso_bsize;
        mp->mnt_fs_bshift = isomp->im_bshift;
        isomp->im_mountp = mp;
        isomp->im_dev = dev;
        isomp->im_devvp = devvp;

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

        /* Check the Rock Ridge Extension support */
        if (!(argp->flags & ISOFSMNT_NORRIP)) {
                struct iso_directory_record *rootp;

                if ((error = bread(isomp->im_devvp,
                                   (isomp->root_extent + ext_attr_length) <<
                                   (isomp->im_bshift - DEV_BSHIFT),
                                   isomp->logical_block_size,
                                   0, &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, BC_AGE);
                bp = NULL;
        }
        isomp->im_flags = argp->flags & (ISOFSMNT_NORRIP | ISOFSMNT_GENS |
                 ISOFSMNT_EXTATT | ISOFSMNT_NOJOLIET | ISOFSMNT_RRCASEINS |
                 ISOFSMNT_UID | ISOFSMNT_GID);

        if (isomp->im_flags & ISOFSMNT_GENS)
                isomp->iso_ftype = ISO_FTYPE_9660;
        else if (isomp->im_flags & ISOFSMNT_NORRIP) {
                isomp->iso_ftype = ISO_FTYPE_DEFAULT;
                if (argp->flags & ISOFSMNT_NOCASETRANS)
                        isomp->im_flags |= ISOFSMNT_NOCASETRANS;
        } else
                isomp->iso_ftype = ISO_FTYPE_RRIP;

        /* Check the Joliet Extension support */
        if ((argp->flags & ISOFSMNT_NORRIP) != 0 &&
            (argp->flags & ISOFSMNT_NOJOLIET) == 0 &&
            supbp != NULL) {
                joliet_level = 0;
                sup = (struct iso_supplementary_descriptor *)supbp->b_data;

                if ((isonum_711(sup->flags) & 1) == 0) {
                        if (memcmp(sup->escape, "%/@", 3) == 0)
                                joliet_level = 1;
                        if (memcmp(sup->escape, "%/C", 3) == 0)
                                joliet_level = 2;
                        if (memcmp(sup->escape, "%/E", 3) == 0)
                                joliet_level = 3;
                }
                if (joliet_level != 0) {
                        if (iso_makemp(isomp, supbp, NULL) == -1) {
                                error = EINVAL;
                                goto out;
                        }
                        isomp->im_joliet_level = joliet_level;
                }
        }

        if (supbp != NULL) {
                brelse(supbp, 0);
                supbp = NULL;
        }

        spec_node_setmountedfs(devvp, mp);

        return 0;
out:
        if (bp)
                brelse(bp, 0);
        if (pribp)
                brelse(pribp, 0);
        if (supbp)
                brelse(supbp, 0);
        if (isomp) {
                free(isomp, M_ISOFSMNT);
                mp->mnt_data = NULL;
        }
        return error;
}

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

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

        if (mntflags & MNT_FORCE)
                flags |= FORCECLOSE;
        if ((error = vflush(mp, NULLVP, flags)) != 0)
                return (error);

        isomp = VFSTOISOFS(mp);

        if (isomp->im_devvp->v_type != VBAD)
                spec_node_setmountedfs(isomp->im_devvp, NULL);

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

/*
 * Return root of a filesystem
 */
int
cd9660_root(struct mount *mp, int lktype, 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);

        return cd9660_vget(mp, ino, lktype, vpp);
}

/*
 * Get file system statistics.
 */
int
cd9660_statvfs(struct mount *mp, struct statvfs *sbp)
{
        struct iso_mnt *isomp;

        isomp = VFSTOISOFS(mp);

        sbp->f_bsize = isomp->logical_block_size;
        sbp->f_frsize = sbp->f_bsize;
        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_bresvd = 0; /* total reserved blocks */
        sbp->f_files =  0; /* total files */
        sbp->f_ffree = 0; /* free file nodes */
        sbp->f_favail = 0; /* free file nodes for non superuser */
        sbp->f_fresvd = 0; /* reserved file nodes */
        copy_statvfs_info(sbp, mp);
        /* Use the first spare for flags: */
        sbp->f_spare[0] = isomp->im_flags;
        return 0;
}

/* ARGSUSED */
int
cd9660_sync(struct mount *mp, int waitfor, kauth_cred_t cred)
{
        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;
        ino_t   ifid_ino;
#ifdef  ISOFS_DBG
        u_long  ifid_start;
#endif
};

/* ARGSUSED */
int
cd9660_fhtovp(struct mount *mp, struct fid *fhp, int lktype, struct vnode **vpp)
{
        struct ifid ifh;
        struct iso_node *ip;
        struct vnode *nvp;
        int error;

        if (fhp->fid_len != sizeof(ifh))
                return EINVAL;

        memcpy(&ifh, fhp, sizeof(ifh));
#ifdef  ISOFS_DBG
        printf("fhtovp: ino %"PRIu64", start %lu\n",
            ifh.ifid_ino, ifh.ifid_start);
#endif

        if ((error = VFS_VGET(mp, ifh.ifid_ino, lktype, &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, int lktype, struct vnode **vpp)
{
        int error;

        error = vcache_get(mp, &ino, sizeof(ino), vpp);
        if (error)
                return error;
        error = vn_lock(*vpp, lktype);
        if (error) {
                vrele(*vpp);
                *vpp = NULL;
                return error;
        }
        return 0;
}

int
cd9660_loadvnode(struct mount *mp, struct vnode *vp,
    const void *key, size_t key_len, const void **new_key)
{
        struct iso_mnt *imp;
        struct iso_node *ip;
        struct iso_directory_record *isodir;
        struct buf *bp;
        dev_t dev;
        ino_t ino;
        int lbn, off;
        int error;

        KASSERT(key_len == sizeof(ino));
        memcpy(&ino, key, key_len);
        imp = VFSTOISOFS(mp);
        dev = imp->im_dev;

        ip = pool_get(&cd9660_node_pool, PR_WAITOK);

        memset(ip, 0, sizeof(struct iso_node));
        ip->i_vnode = vp;
        ip->i_dev = dev;
        ip->i_number = ino;
        ip->i_mnt = imp;
        ip->i_devvp = imp->im_devvp;

        lbn = cd9660_lblkno(imp, ino);
        if (lbn >= imp->volume_space_size) {
                pool_put(&cd9660_node_pool, ip);
                printf("fhtovp: lbn exceed volume space %d\n", lbn);
                return (ESTALE);
        }

        off = cd9660_blkoff(imp, ino);
        if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) {
                pool_put(&cd9660_node_pool, ip);
                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, 0, &bp);
        if (error) {
                pool_put(&cd9660_node_pool, ip);
                printf("fhtovp: bread error %d\n",error);
                return (error);
        }
        isodir = (struct iso_directory_record *)((char *)bp->b_data + off);

        if (off + isonum_711(isodir->length) > imp->logical_block_size) {
                pool_put(&cd9660_node_pool, ip);
                brelse(bp, 0);
                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) {
                pool_put(&cd9660_node_pool, ip);
                if (bp != 0)
                        brelse(bp, 0);
                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

        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;

        vp->v_tag = VT_ISOFS;
        vp->v_op = cd9660_vnodeop_p;
        vp->v_data = ip;
        genfs_node_init(vp, &cd9660_genfsops);

        /*
         * Setup time stamp, attribute
         */
        switch (imp->iso_ftype) {
        default:        /* ISO_FTYPE_9660 */
            {
                struct buf *bp2;
                if ((imp->im_flags & ISOFSMNT_EXTATT)
                    && (off = isonum_711(isodir->ext_attr_length)))
                        cd9660_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, 0);
                break;
            }
        case ISO_FTYPE_RRIP:
                cd9660_rrip_analyze(isodir, ip, imp);
                break;
        }

        brelse(bp, 0);

        /*
         * Initialize the associated vnode
         */
        switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) {
        case VFIFO:
                vp->v_op = cd9660_fifoop_p;
                break;
        case VCHR:
        case VBLK:
                /*
                 * if device, look at device number table for translation
                 */
                vp->v_op = cd9660_specop_p;
                spec_node_init(vp, ip->inode.iso_rdev);
                break;
        case VLNK:
        case VNON:
        case VSOCK:
        case VDIR:
        case VBAD:
                break;
        case VREG:
                uvm_vnp_setsize(vp, ip->i_size);
                break;
        }

        if (vp->v_type != VREG)
                uvm_vnp_setsize(vp, 0);

        if (ip->iso_extent == imp->root_extent)
                vp->v_vflag |= VV_ROOT;

        /*
         * XXX need generation number?
         */

        *new_key = &ip->i_number;
        return 0;
}

/*
 * Vnode pointer to File handle
 */
/* ARGSUSED */
int
cd9660_vptofh(struct vnode *vp, struct fid *fhp, size_t *fh_size)
{
        struct iso_node *ip = VTOI(vp);
        struct ifid ifh;

        if (*fh_size < sizeof(struct ifid)) {
                *fh_size = sizeof(struct ifid);
                return E2BIG;
        }
        *fh_size = sizeof(struct ifid);

        memset(&ifh, 0, sizeof(ifh));
        ifh.ifid_len = sizeof(struct ifid);
        ifh.ifid_ino = ip->i_number;
#ifdef  ISOFS_DBG
        ifh.ifid_start = ip->iso_start;
#endif
        memcpy(fhp, &ifh, sizeof(ifh));

#ifdef  ISOFS_DBG
        printf("vptofh: ino %"PRIu64", start %lu\n",
            ifh.ifid_ino,ifh.ifid_start);
#endif
        return 0;
}