/*-
 * 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_vnops.c      8.19 (Berkeley) 5/27/95
 * $FreeBSD: src/sys/isofs/cd9660/cd9660_vnops.c,v 1.62 1999/12/15 23:01:51 eivind Exp $
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/uio.h>
#include <sys/proc.h>
#include <sys/kernel.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <vfs/fifofs/fifo.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/unistd.h>
#include <sys/filio.h>
#include <sys/lockf.h>
#include <sys/objcache.h>

#include <vm/vm.h>
#include <vm/vnode_pager.h>

#include <sys/buf2.h>

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

static int cd9660_access(struct vop_access_args *);
static int cd9660_advlock(struct vop_advlock_args *);
static int cd9660_getattr(struct vop_getattr_args *);
static int cd9660_ioctl(struct vop_ioctl_args *);
static int cd9660_pathconf(struct vop_pathconf_args *);
static int cd9660_open(struct vop_open_args *);
static int cd9660_read(struct vop_read_args *);
static int cd9660_setattr(struct vop_setattr_args *);
struct isoreaddir;
static int iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off);
static int iso_shipdir(struct isoreaddir *idp);
static int cd9660_readdir(struct vop_readdir_args *);
static int cd9660_readlink(struct vop_readlink_args *ap);
static int cd9660_strategy(struct vop_strategy_args *);
static int cd9660_print(struct vop_print_args *);

/*
 * Setattr call. Only allowed for block and character special devices.
 *
 * cd9660_setattr(struct vnode *a_vp, struct vattr *a_vap,
 *                struct ucred *a_cred, struct proc *a_p)
 */
int
cd9660_setattr(struct vop_setattr_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct vattr *vap = ap->a_vap;

        if (vap->va_flags != (u_long)VNOVAL || vap->va_uid != (uid_t)VNOVAL ||
            vap->va_gid != (gid_t)VNOVAL || vap->va_atime.tv_sec != VNOVAL ||
            vap->va_mtime.tv_sec != VNOVAL || vap->va_mode != (mode_t)VNOVAL)
                return (EROFS);
        if (vap->va_size != (u_quad_t)VNOVAL) {
                switch (vp->v_type) {
                case VDIR:
                        return (EISDIR);
                case VLNK:
                case VREG:
                case VDATABASE:
                        return (EROFS);
                case VCHR:
                case VBLK:
                case VSOCK:
                case VFIFO:
                default:
                        return (0);
                }
        }
        return (0);
}

/*
 * Check mode permission on inode pointer. Mode is READ, WRITE or EXEC.
 * The mode is shifted to select the owner/group/other fields. The
 * super user is granted all permissions.
 *
 * cd9660_access(struct vnode *a_vp, int a_mode, struct ucred *a_cred,
 *               struct proc *a_p)
 */
/* ARGSUSED */
static int
cd9660_access(struct vop_access_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct iso_node *ip = VTOI(vp);
        mode_t file_mode;
        uid_t uid;
        gid_t gid;

        KKASSERT(vp->v_mount->mnt_flag & MNT_RDONLY);

        file_mode = ip->inode.iso_mode;
        file_mode &= (vp->v_type == VDIR ?
                      ip->i_mnt->im_dmask : ip->i_mnt->im_fmask);
        uid = (ip->i_mnt->im_flags & ISOFSMNT_UID) ?
               ip->i_mnt->im_uid : ip->inode.iso_uid;
        gid = (ip->i_mnt->im_flags & ISOFSMNT_GID) ?
               ip->i_mnt->im_gid : ip->inode.iso_gid;

        return (vop_helper_access(ap, uid, gid, file_mode, 0));
}

/*
 * cd9660_getattr(struct vnode *a_vp, struct vattr *a_vap)
 */
static int
cd9660_getattr(struct vop_getattr_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct vattr *vap = ap->a_vap;
        struct iso_node *ip = VTOI(vp);

        vap->va_fsid    = devid_from_dev(ip->i_dev);
        vap->va_fileid  = ip->i_number;

        vap->va_mode    = ip->inode.iso_mode;
        vap->va_mode    &= (vp->v_type == VDIR ?
                            ip->i_mnt->im_dmask : ip->i_mnt->im_fmask);

        vap->va_nlink   = ip->inode.iso_links;
        vap->va_uid     = (ip->i_mnt->im_flags & ISOFSMNT_UID) ?
                           ip->i_mnt->im_uid : ip->inode.iso_uid;
        vap->va_gid     = (ip->i_mnt->im_flags & ISOFSMNT_GID) ?
                           ip->i_mnt->im_gid : ip->inode.iso_gid;
        vap->va_atime   = ip->inode.iso_atime;
        vap->va_mtime   = ip->inode.iso_mtime;
        vap->va_ctime   = ip->inode.iso_ctime;
        vap->va_rmajor  = umajor(ip->inode.iso_rdev);
        vap->va_rminor  = uminor(ip->inode.iso_rdev);

        vap->va_size    = (u_quad_t)(unsigned long)ip->i_size;
        if (ip->i_size == 0 && (vap->va_mode & S_IFMT) == S_IFLNK) {
                struct vop_readlink_args rdlnk;
                struct iovec aiov;
                struct uio auio;
                char *cp;

                cp = kmalloc(MAXPATHLEN, M_TEMP, M_WAITOK);
                aiov.iov_base = cp;
                aiov.iov_len = MAXPATHLEN;
                auio.uio_iov = &aiov;
                auio.uio_iovcnt = 1;
                auio.uio_offset = 0;
                auio.uio_rw = UIO_READ;
                auio.uio_segflg = UIO_SYSSPACE;
                auio.uio_td = curthread;
                auio.uio_resid = MAXPATHLEN;
                rdlnk.a_uio = &auio;
                rdlnk.a_vp = ap->a_vp;
                rdlnk.a_cred = proc0.p_ucred; /* use root cred */
                if (cd9660_readlink(&rdlnk) == 0)
                        vap->va_size = MAXPATHLEN - auio.uio_resid;
                kfree(cp, M_TEMP);
        }
        vap->va_flags   = 0;
        vap->va_gen = 1;
        vap->va_blocksize = ip->i_mnt->logical_block_size;
        vap->va_bytes   = (u_quad_t) ip->i_size;
        vap->va_type    = vp->v_type;
        vap->va_filerev = 0;
        return (0);
}

/*
 * Vnode op for ioctl.
 *
 * cd9660_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data,
 *              int a_fflag, struct ucred *a_cred, struct proc *a_p)
 */
static int
cd9660_ioctl(struct vop_ioctl_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct iso_node *ip = VTOI(vp);

        switch (ap->a_command) {

        case FIOGETLBA:
                *(int *)(ap->a_data) = ip->iso_start;
                return 0;
        default:
                return (ENOTTY);
        }
}

/*
 * open is called when the kernel intends to read or memory map a vnode.
 */
static int
cd9660_open(struct vop_open_args *ap)
{
        return(vop_stdopen(ap));
}

/*
 * Vnode op for reading.
 *
 * cd9660_read(struct vnode *a_vp, struct uio *a_uio, int a_ioflag,
 *              struct ucred *a_cred)
 */
static int
cd9660_read(struct vop_read_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct uio *uio = ap->a_uio;
        struct iso_node *ip = VTOI(vp);
        struct iso_mnt *imp;
        struct buf *bp;
        daddr_t lbn, rablock;
        off_t raoffset;
        off_t loffset;
        off_t diff;
        int rasize, error = 0;
        int seqcount;
        long size, n, on;

        seqcount = ap->a_ioflag >> IO_SEQSHIFT;

        if (uio->uio_resid == 0)
                return (0);
        if (uio->uio_offset < 0)
                return (EINVAL);
        ip->i_flag |= IN_ACCESS;
        imp = ip->i_mnt;
        do {
                lbn = lblkno(imp, uio->uio_offset);
                loffset = lblktooff(imp, lbn);
                on = blkoff(imp, uio->uio_offset);
                n = szmin((u_int)(imp->logical_block_size - on),
                          uio->uio_resid);
                diff = (off_t)ip->i_size - uio->uio_offset;
                if (diff <= 0)
                        return (0);
                if (diff < n)
                        n = diff;
                size = blksize(imp, ip, lbn);
                rablock = lbn + 1;
                raoffset = lblktooff(imp, rablock);
                if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
                        if (raoffset < ip->i_size) {
                                error = cluster_read(vp, (off_t)ip->i_size,
                                                     loffset, size,
                                                     uio->uio_resid,
                                                     (ap->a_ioflag >> IO_SEQSHIFT) *
                                                      MAXBSIZE,
                                                     &bp);
                        } else {
                                error = bread(vp, loffset, size, &bp);
                        }
                } else {
                        if (seqcount > 1 &&
                            lblktosize(imp, rablock) < ip->i_size) {
                                rasize = blksize(imp, ip, rablock);
                                error = breadn(vp, loffset, size, &raoffset,
                                               &rasize, 1, &bp);
                        } else
                                error = bread(vp, loffset, size, &bp);
                }
                n = imin(n, size - bp->b_resid);
                if (error) {
                        brelse(bp);
                        return (error);
                }

                error = uiomove(bp->b_data + on, (int)n, uio);
                brelse(bp);
        } while (error == 0 && uio->uio_resid > 0 && n != 0);
        return (error);
}

/* struct dirent + enough space for the maximum supported size */
struct iso_dirent {
        struct dirent de;
        char de_name[_DIRENT_RECLEN(NAME_MAX) - sizeof(struct dirent)];
};

/*
 * Structure for reading directories
 */
struct isoreaddir {
        struct iso_dirent saveent;
        struct iso_dirent assocent;
        struct iso_dirent current;
        off_t saveoff;
        off_t assocoff;
        off_t curroff;
        struct uio *uio;
        off_t uio_off;
        int eofflag;
        off_t *cookies;
        int ncookies;
};

int
iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off)
{
        int error;

        dp->d_name[dp->d_namlen] = 0;

        if (idp->uio->uio_resid < _DIRENT_DIRSIZ(dp)) {
                idp->eofflag = 0;
                return (-1);
        }

        if (idp->cookies) {
                if (idp->ncookies <= 0) {
                        idp->eofflag = 0;
                        return (-1);
                }

                *idp->cookies++ = off;
                --idp->ncookies;
        }

        if ((error = uiomove((caddr_t) dp,_DIRENT_DIRSIZ(dp),idp->uio)) != 0)
                return (error);
        idp->uio_off = off;
        return (0);
}

int
iso_shipdir(struct isoreaddir *idp)
{
        struct dirent *dp;
        int cl, sl, assoc;
        int error;
        char *cname, *sname;

        cl = idp->current.de.d_namlen;
        cname = idp->current.de.d_name;
assoc = (cl > 1) && (*cname == ASSOCCHAR);
        if (assoc) {
                cl--;
                cname++;
        }

        dp = &idp->saveent.de;
        sname = dp->d_name;
        if (!(sl = dp->d_namlen)) {
                dp = &idp->assocent.de;
                sname = dp->d_name + 1;
                sl = dp->d_namlen - 1;
        }
        if (sl > 0) {
                if (sl != cl
                    || bcmp(sname,cname,sl)) {
                        if (idp->assocent.de.d_namlen) {
                                if ((error = iso_uiodir(idp,&idp->assocent.de,idp->assocoff)) != 0)
                                        return (error);
                                idp->assocent.de.d_namlen = 0;
                        }
                        if (idp->saveent.de.d_namlen) {
                                if ((error = iso_uiodir(idp,&idp->saveent.de,idp->saveoff)) != 0)
                                        return (error);
                                idp->saveent.de.d_namlen = 0;
                        }
                }
        }
        if (assoc) {
                idp->assocoff = idp->curroff;
                bcopy(&idp->current,&idp->assocent,_DIRENT_DIRSIZ(&idp->current.de));
        } else {
                idp->saveoff = idp->curroff;
                bcopy(&idp->current,&idp->saveent,_DIRENT_DIRSIZ(&idp->current.de));
        }
        return (0);
}

/*
 * Vnode op for readdir
 *
 * cd9660_readdir(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred,
 *                int *a_eofflag, int *a_ncookies, off_t *a_cookies)
 */
static int
cd9660_readdir(struct vop_readdir_args *ap)
{
        struct uio *uio = ap->a_uio;
        struct isoreaddir *idp;
        struct vnode *vdp = ap->a_vp;
        struct iso_node *dp;
        struct iso_mnt *imp;
        struct buf *bp = NULL;
        struct iso_directory_record *ep;
        int entryoffsetinblock;
        doff_t endsearch;
        u_long bmask;
        int error = 0;
        int reclen;
        u_short namelen;
        int ncookies = 0;
        off_t *cookies = NULL;

        dp = VTOI(vdp);
        imp = dp->i_mnt;
        bmask = imp->im_bmask;

        error = vn_lock(vdp, LK_EXCLUSIVE | LK_RETRY | LK_FAILRECLAIM);
        if (error)
                return (error);

        idp = kmalloc(sizeof(*idp), M_TEMP, M_WAITOK);
        idp->saveent.de.d_namlen = idp->assocent.de.d_namlen = 0;
        /*
         * XXX
         * Is it worth trying to figure out the type?
         */
        idp->saveent.de.d_type = DT_UNKNOWN;
        idp->assocent.de.d_type = DT_UNKNOWN;
        idp->current.de.d_type = DT_UNKNOWN;
        idp->uio = uio;
        if (ap->a_ncookies == NULL) {
                idp->cookies = NULL;
        } else {
                /*
                 * Guess the number of cookies needed.  Guess at least
                 * 1 to avoid a degenerate case in malloc, and cap at
                 * a reasonable limit.
                 */
                ncookies = uio->uio_resid / 16 + 1;
                if (ncookies > 1024)
                        ncookies = 1024;
                cookies = kmalloc(ncookies * sizeof(off_t), M_TEMP, M_WAITOK);
                idp->cookies = cookies;
                idp->ncookies = ncookies;
        }
        idp->eofflag = 1;
        idp->curroff = uio->uio_offset;

        if ((entryoffsetinblock = idp->curroff & bmask) &&
            (error = cd9660_devblkatoff(vdp, idp->curroff, NULL, &bp))) {
                kfree(idp, M_TEMP);
                goto done;
        }
        endsearch = dp->i_size;

        while (idp->curroff < endsearch) {
                /*
                 * If offset is on a block boundary,
                 * read the next directory block.
                 * Release previous if it exists.
                 */
                if ((idp->curroff & bmask) == 0) {
                        if (bp != NULL)
                                brelse(bp);
                        if ((error =
                            cd9660_devblkatoff(vdp, idp->curroff, NULL, &bp)) != 0)
                                break;
                        entryoffsetinblock = 0;
                }
                /*
                 * Get pointer to next entry.
                 */
                ep = (struct iso_directory_record *)
                        ((char *)bp->b_data + entryoffsetinblock);

                reclen = isonum_711(ep->length);
                if (reclen == 0) {
                        /* skip to next block, if any */
                        idp->curroff =
                            (idp->curroff & ~bmask) + imp->logical_block_size;
                        continue;
                }

                if (reclen < ISO_DIRECTORY_RECORD_SIZE) {
                        error = EINVAL;
                        /* illegal entry, stop */
                        break;
                }

                if (entryoffsetinblock + reclen > imp->logical_block_size) {
                        error = EINVAL;
                        /* illegal directory, so stop looking */
                        break;
                }

                idp->current.de.d_namlen = isonum_711(ep->name_len);

                if (reclen < ISO_DIRECTORY_RECORD_SIZE + idp->current.de.d_namlen) {
                        error = EINVAL;
                        /* illegal entry, stop */
                        break;
                }

                if (isonum_711(ep->flags)&2)
                        idp->current.de.d_ino = isodirino(ep, imp);
                else
                        idp->current.de.d_ino = bp->b_bio1.bio_offset +
                                                entryoffsetinblock;

                idp->curroff += reclen;

                switch (imp->iso_ftype) {
                case ISO_FTYPE_RRIP:
                {
                        ino_t cur_fileno = idp->current.de.d_ino;
                        cd9660_rrip_getname(ep,idp->current.de.d_name, &namelen,
                                           &cur_fileno,imp);
                        idp->current.de.d_ino = cur_fileno;
                        idp->current.de.d_namlen = namelen;
                        if (idp->current.de.d_namlen)
                                error = iso_uiodir(idp,&idp->current.de,idp->curroff);
                        break;
                }
                default: /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA*/
                        strcpy(idp->current.de.d_name,"..");
                        if (idp->current.de.d_namlen == 1 && ep->name[0] == 0) {
                                idp->current.de.d_namlen = 1;
                                error = iso_uiodir(idp,&idp->current.de,idp->curroff);
                        } else if (idp->current.de.d_namlen == 1 && ep->name[0] == 1) {
                                idp->current.de.d_namlen = 2;
                                error = iso_uiodir(idp,&idp->current.de,idp->curroff);
                        } else {
                                isofntrans(ep->name,idp->current.de.d_namlen,
                                           idp->current.de.d_name, &namelen,
                                           imp->iso_ftype == ISO_FTYPE_9660,
                                           isonum_711(ep->flags)&4,
                                           imp->joliet_level,
                                           imp->im_flags,
                                           imp->im_d2l);
                                idp->current.de.d_namlen = namelen;
                                if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
                                        error = iso_shipdir(idp);
                                else
                                        error = iso_uiodir(idp,&idp->current.de,idp->curroff);
                        }
                }
                if (error)
                        break;

                entryoffsetinblock += reclen;
        }

        if (!error && imp->iso_ftype == ISO_FTYPE_DEFAULT) {
                idp->current.de.d_namlen = 0;
                error = iso_shipdir(idp);
        }
        if (error < 0)
                error = 0;

        if (ap->a_ncookies != NULL) {
                if (error)
                        kfree(cookies, M_TEMP);
                else {
                        /*
                         * Work out the number of cookies actually used.
                         */
                        *ap->a_ncookies = ncookies - idp->ncookies;
                        *ap->a_cookies = cookies;
                }
        }

        if (bp)
                brelse (bp);

        uio->uio_offset = idp->uio_off;
        *ap->a_eofflag = idp->eofflag;

        kfree(idp, M_TEMP);

done:
        vn_unlock(vdp);
        return (error);
}

/*
 * Return target name of a symbolic link
 * Shouldn't we get the parent vnode and read the data from there?
 * This could eventually result in deadlocks in cd9660_lookup.
 * But otherwise the block read here is in the block buffer two times.
 */
typedef struct iso_directory_record ISODIR;
typedef struct iso_node             ISONODE;
typedef struct iso_mnt              ISOMNT;
/*
 * cd9660_readlink(struct vnode *a_vp, struct uio *a_uio, struct ucred *a_cred)
 */
static int
cd9660_readlink(struct vop_readlink_args *ap)
{
        ISONODE *ip;
        ISODIR  *dirp;
        ISOMNT  *imp;
        struct  buf *bp;
        struct  uio *uio;
        u_short symlen;
        int     error;
        char    *symname;

        ip  = VTOI(ap->a_vp);
        imp = ip->i_mnt;
        uio = ap->a_uio;

        if (imp->iso_ftype != ISO_FTYPE_RRIP)
                return (EINVAL);

        /*
         * Get parents directory record block that this inode included.
         */
        error = bread(imp->im_devvp,
                      rounddown2((off_t)ip->i_number, 1 << imp->im_bshift),
                      imp->logical_block_size, &bp);
        if (error) {
                brelse(bp);
                return (EINVAL);
        }

        /*
         * Setup the directory pointer for this inode
         */
        dirp = (ISODIR *)(bp->b_data + (ip->i_number & imp->im_bmask));

        /*
         * Just make sure, we have a right one....
         *   1: Check not cross boundary on block
         */
        if ((ip->i_number & imp->im_bmask) + isonum_711(dirp->length)
            > (unsigned)imp->logical_block_size) {
                brelse(bp);
                return (EINVAL);
        }

        /*
         * Now get a buffer
         * Abuse a namei buffer for now.
         */
        if (uio->uio_segflg == UIO_SYSSPACE)
                symname = uio->uio_iov->iov_base;
        else
                symname = objcache_get(namei_oc, M_WAITOK);

        /*
         * Ok, we just gathering a symbolic name in SL record.
         */
        if (cd9660_rrip_getsymname(dirp, symname, &symlen, imp) == 0) {
                if (uio->uio_segflg != UIO_SYSSPACE)
                        objcache_put(namei_oc, symname);
                brelse(bp);
                return (EINVAL);
        }
        /*
         * Don't forget before you leave from home ;-)
         */
        brelse(bp);

        /*
         * return with the symbolic name to caller's.
         */
        if (uio->uio_segflg != UIO_SYSSPACE) {
                error = uiomove(symname, symlen, uio);
                objcache_put(namei_oc, symname);
                return (error);
        }
        uio->uio_resid -= symlen;
        uio->uio_iov->iov_base = (char *)uio->uio_iov->iov_base + symlen;
        uio->uio_iov->iov_len -= symlen;
        return (0);
}

/*
 * Calculate the logical to physical mapping if not done already,
 * then call the device strategy routine.
 *
 * cd9660_strategy(struct buf *a_vp, struct buf *a_bio)
 */
static int
cd9660_strategy(struct vop_strategy_args *ap)
{
        struct bio *bio = ap->a_bio;
        struct bio *nbio;
        struct buf *bp = bio->bio_buf;
        struct vnode *vp = ap->a_vp;
        struct iso_node *ip;
        int error;

        ip = VTOI(vp);
        if (vp->v_type == VBLK || vp->v_type == VCHR)
                panic("cd9660_strategy: spec");
        nbio = push_bio(bio);
        if (nbio->bio_offset == NOOFFSET) {
                error = VOP_BMAP(vp, bio->bio_offset,
                                 &nbio->bio_offset, NULL, NULL, bp->b_cmd);
                if (error) {
                        bp->b_error = error;
                        bp->b_flags |= B_ERROR;
                        /* I/O was never started on nbio, must biodone(bio) */
                        biodone(bio);
                        return (error);
                }
                if (nbio->bio_offset == NOOFFSET)
                        clrbuf(bp);
        }
        if (nbio->bio_offset == NOOFFSET) {
                /* I/O was never started on nbio, must biodone(bio) */
                biodone(bio);
                return (0);
        }
        vp = ip->i_devvp;
        vn_strategy(vp, nbio);
        return (0);
}

/*
 * Print out the contents of an inode.
 *
 * cd9660_print(struct vnode *a_vp)
 */
static int
cd9660_print(struct vop_print_args *ap)
{
        kprintf("tag VT_ISOFS, isofs vnode\n");
        return (0);
}

/*
 * Return POSIX pathconf information applicable to cd9660 filesystems.
 *
 * cd9660_pathconf(struct vnode *a_vp, int a_name, register_t *a_retval)
 */
static int
cd9660_pathconf(struct vop_pathconf_args *ap)
{
        switch (ap->a_name) {
        case _PC_LINK_MAX:
                *ap->a_retval = 1;
                return (0);
        case _PC_NAME_MAX:
                if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP)
                        *ap->a_retval = NAME_MAX;
                else
                        *ap->a_retval = 37;
                return (0);
        case _PC_PATH_MAX:
                *ap->a_retval = PATH_MAX;
                return (0);
        case _PC_PIPE_BUF:
                *ap->a_retval = PIPE_BUF;
                return (0);
        case _PC_CHOWN_RESTRICTED:
                *ap->a_retval = 1;
                return (0);
        case _PC_NO_TRUNC:
                *ap->a_retval = 1;
                return (0);
        default:
                return (EINVAL);
        }
        /* NOTREACHED */
}

/*
 * Advisory lock support
 */
static int
cd9660_advlock(struct vop_advlock_args *ap)
{
        struct iso_node *ip = VTOI(ap->a_vp);
        return (lf_advlock(ap, &(ip->i_lockf), ip->i_size));
}

/*
 * Global vfs data structures for cd9660
 */
struct vop_ops cd9660_vnode_vops = {
        .vop_default =          vop_defaultop,
        .vop_open =             cd9660_open,
        .vop_access =           cd9660_access,
        .vop_advlock =          cd9660_advlock,
        .vop_bmap =             cd9660_bmap,
        .vop_old_lookup =       cd9660_lookup,
        .vop_getattr =          cd9660_getattr,
        .vop_inactive =         cd9660_inactive,
        .vop_ioctl =            cd9660_ioctl,
        .vop_pathconf =         cd9660_pathconf,
        .vop_print =            cd9660_print,
        .vop_read =             cd9660_read,
        .vop_readdir =          cd9660_readdir,
        .vop_readlink =         cd9660_readlink,
        .vop_reclaim =          cd9660_reclaim,
        .vop_setattr =          cd9660_setattr,
        .vop_strategy =         cd9660_strategy,
        .vop_getpages =         vop_stdgetpages,
        .vop_putpages =         vop_stdputpages
};

/*
 * Special device vnode ops
 */
struct vop_ops cd9660_spec_vops = {
        .vop_default =          vop_defaultop,
        .vop_read =             vop_stdnoread,
        .vop_access =           cd9660_access,
        .vop_getattr =          cd9660_getattr,
        .vop_inactive =         cd9660_inactive,
        .vop_print =            cd9660_print,
        .vop_reclaim =          cd9660_reclaim,
        .vop_setattr =          cd9660_setattr,
};

struct vop_ops cd9660_fifo_vops = {
        .vop_default =          fifo_vnoperate,
        .vop_access =           cd9660_access,
        .vop_getattr =          cd9660_getattr,
        .vop_inactive =         cd9660_inactive,
        .vop_print =            cd9660_print,
        .vop_reclaim =          cd9660_reclaim,
        .vop_setattr =          cd9660_setattr,
};