/*      $OpenBSD: cd9660_vnops.c,v 1.97 2024/10/18 05:52:32 miod Exp $  */
/*      $NetBSD: cd9660_vnops.c,v 1.42 1997/10/16 23:56:57 christos 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_vnops.c      8.15 (Berkeley) 12/5/94
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/resourcevar.h>
#include <sys/kernel.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/buf.h>
#include <sys/conf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/lock.h>
#include <sys/malloc.h>
#include <sys/pool.h>
#include <sys/dirent.h>
#include <sys/ioctl.h>
#include <sys/ioccom.h>
#include <sys/specdev.h>
#include <sys/unistd.h>

#include <miscfs/fifofs/fifo.h>

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

int cd9660_kqfilter(void *v);


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

int     iso_uiodir(struct isoreaddir *, struct dirent *, off_t);
int     iso_shipdir(struct isoreaddir *);

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

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

        return (EINVAL);
}

/*
 * Open called.
 *
 * Nothing to do.
 */
int
cd9660_open(void *v)
{
        return (0);
}

/*
 * Close called
 *
 * Update the times on the inode on writeable file systems.
 */
int
cd9660_close(void *v)
{
        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.
 */
int
cd9660_access(void *v)
{
        struct vop_access_args *ap = v;
        struct iso_node *ip = VTOI(ap->a_vp);

        return (vaccess(ap->a_vp->v_type, ip->inode.iso_mode & ALLPERMS,
            ip->inode.iso_uid, ip->inode.iso_gid, ap->a_mode, ap->a_cred));
}

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

        vap->va_fsid    = ip->i_dev;
        vap->va_fileid  = ip->i_number;

        vap->va_mode    = ip->inode.iso_mode & ALLPERMS;
        vap->va_nlink   = ip->inode.iso_links;
        vap->va_uid     = ip->inode.iso_uid;
        vap->va_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_rdev    = ip->inode.iso_rdev;

        vap->va_size    = (u_quad_t) ip->i_size;
        if (ip->i_size == 0 && vp->v_type  == VLNK) {
                struct vop_readlink_args rdlnk;
                struct iovec aiov;
                struct uio auio;
                char *cp;

                cp = malloc(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_procp = ap->a_p;
                auio.uio_resid = MAXPATHLEN;
                rdlnk.a_uio = &auio;
                rdlnk.a_vp = ap->a_vp;
                rdlnk.a_cred = ap->a_cred;
                if (cd9660_readlink(&rdlnk) == 0)
                        vap->va_size = MAXPATHLEN - auio.uio_resid;
                free(cp, M_TEMP, 0);
        }
        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;
        return (0);
}

/*
 * Vnode op for reading.
 */
int
cd9660_read(void *v)
{
        struct vop_read_args *ap = v;
        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 diff;
        int error = 0;
        long size, on;
        size_t n;

        if (uio->uio_resid == 0)
                return (0);
        if (uio->uio_offset < 0)
                return (EINVAL);
        ip->i_flag |= IN_ACCESS;
        imp = ip->i_mnt;
        do {
                struct cluster_info *ci = &ip->i_ci;

                lbn = lblkno(imp, uio->uio_offset);
                on = blkoff(imp, uio->uio_offset);
                n = ulmin(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;
#define MAX_RA 32
                if (ci->ci_lastr + 1 == lbn) {
                        struct ra {
                                daddr_t blks[MAX_RA];
                                int sizes[MAX_RA];
                        } *ra;
                        int i;

                        ra = malloc(sizeof *ra, M_TEMP, M_WAITOK);
                        for (i = 0; i < MAX_RA &&
                            lblktosize(imp, (rablock + i)) < ip->i_size;
                            i++) {
                                ra->blks[i] = rablock + i;
                                ra->sizes[i] = blksize(imp, ip, rablock + i);
                        }
                        error = breadn(vp, lbn, size, ra->blks,
                            ra->sizes, i, &bp);
                        free(ra, M_TEMP, 0);
                } else
                        error = bread(vp, lbn, size, &bp);
                ci->ci_lastr = lbn;
                n = ulmin(n, size - bp->b_resid);
                if (error) {
                        brelse(bp);
                        return (error);
                }

                error = uiomove(bp->b_data + on, n, uio);

                brelse(bp);
        } while (error == 0 && uio->uio_resid > 0 && n != 0);
        return (error);
}

int
cd9660_ioctl(void *v)
{
        return (ENOTTY);
}

/*
 * Mmap a file
 *
 * NB Currently unsupported.
 */
int
cd9660_mmap(void *v)
{

        return (EINVAL);
}

/*
 * Seek on a file
 *
 * Nothing to do, so just return.
 */
int
cd9660_seek(void *v)
{
        return (0);
}

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

        dp->d_name[dp->d_namlen] = 0;
        dp->d_reclen = DIRENT_SIZE(dp);

        if (memchr(dp->d_name, '/', dp->d_namlen) != NULL) {
                /* illegal file name */
                return (EINVAL);
        }

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

        dp->d_off = off;
        if ((error = uiomove(dp, dp->d_reclen, 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.d_namlen;
        cname = idp->current.d_name;

        if ((assoc = cl > 1 && *cname == ASSOCCHAR)) {
                cl--;
                cname++;
        }

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

/*
 * Vnode op for readdir
 */
int
cd9660_readdir(void *v)
{
        struct vop_readdir_args *ap = v;
        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;
        cdino_t ino;

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

        idp = malloc(sizeof(*idp), M_TEMP, M_WAITOK);

        /*
         * These are passed to copyout(), so make sure there's no garbage
         * being leaked in padding or after short names.
         */
        memset(&idp->saveent, 0, sizeof(idp->saveent));
        memset(&idp->assocent, 0, sizeof(idp->assocent));
        memset(&idp->current, 0, sizeof(idp->current));

        /*
         * XXX
         * Is it worth trying to figure out the type?
         */
        idp->saveent.d_type = idp->assocent.d_type = idp->current.d_type =
            DT_UNKNOWN;
        idp->uio = uio;
        idp->eofflag = 1;
        idp->curroff = uio->uio_offset;
        idp->uio_off = uio->uio_offset;

        if ((entryoffsetinblock = idp->curroff & bmask) &&
            (error = cd9660_bufatoff(dp, (off_t)idp->curroff, NULL, &bp))) {
                free(idp, M_TEMP, 0);
                return (error);
        }
        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);
                        error = cd9660_bufatoff(dp, (off_t)idp->curroff,
                                             NULL, &bp);
                        if (error)
                                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.d_namlen = isonum_711(ep->name_len);

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

                if (isonum_711(ep->flags)&2)
                        ino = isodirino(ep, imp);
                else
                        ino = dbtob(bp->b_blkno) + entryoffsetinblock;

                idp->curroff += reclen;

                switch (imp->iso_ftype) {
                case ISO_FTYPE_RRIP:
                        cd9660_rrip_getname(ep,idp->current.d_name, &namelen,
                                           &ino, imp);
                        idp->current.d_fileno = ino;
                        idp->current.d_namlen = (u_char)namelen;
                        if (idp->current.d_namlen)
                                error = iso_uiodir(idp,&idp->current,idp->curroff);
                        break;
                default:        /* ISO_FTYPE_DEFAULT || ISO_FTYPE_9660 */
                        idp->current.d_fileno = ino;
                        strlcpy(idp->current.d_name,"..",
                            sizeof idp->current.d_name);
                        if (idp->current.d_namlen == 1 && ep->name[0] == 0) {
                                idp->current.d_namlen = 1;
                                error = iso_uiodir(idp,&idp->current,idp->curroff);
                        } else if (idp->current.d_namlen == 1 && 
                            ep->name[0] == 1) {
                                idp->current.d_namlen = 2;
                                error = iso_uiodir(idp,&idp->current,idp->curroff);
                        } else {
                                isofntrans(ep->name,idp->current.d_namlen,
                                           idp->current.d_name, &namelen,
                                           imp->iso_ftype == ISO_FTYPE_9660,
                                           isonum_711(ep->flags) & 4,
                                           imp->joliet_level);
                                idp->current.d_namlen = (u_char)namelen;
                                if (imp->iso_ftype == ISO_FTYPE_DEFAULT)
                                        error = iso_shipdir(idp);
                                else
                                        error = iso_uiodir(idp,&idp->current,idp->curroff);
                        }
                }
                if (error)
                        break;

                entryoffsetinblock += reclen;
        }

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

        if (bp)
                brelse (bp);

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

        free(idp, M_TEMP, 0);

        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;
int
cd9660_readlink(void *v)
{
        struct vop_readlink_args *ap = v;
        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,
                      (ip->i_number >> imp->im_bshift) <<
                      (imp->im_bshift - DEV_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)
            > imp->logical_block_size) {
                brelse(bp);
                return (EINVAL);
        }

        /*
         * Now get a buffer
         * Abuse a namei buffer for now.
         */
        if (uio->uio_segflg == UIO_SYSSPACE &&
            uio->uio_iov->iov_len >= MAXPATHLEN)
                symname = uio->uio_iov->iov_base;
        else
                symname = pool_get(&namei_pool, PR_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 ||
                    uio->uio_iov->iov_len < MAXPATHLEN)
                        pool_put(&namei_pool, 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 ||
            uio->uio_iov->iov_len < MAXPATHLEN) {
                error = uiomove(symname, symlen, uio);
                pool_put(&namei_pool, 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);
}

int
cd9660_link(void *v)
{
        struct vop_link_args *ap = v;

        VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
        vput(ap->a_dvp);
        return (EROFS);
}

int
cd9660_symlink(void *v)
{
        struct vop_symlink_args *ap = v;

        VOP_ABORTOP(ap->a_dvp, ap->a_cnp);
        vput(ap->a_dvp);
        return (EROFS);
}

/*
 * Lock an inode.
 */
int
cd9660_lock(void *v)
{
        struct vop_lock_args *ap = v;
        struct vnode *vp = ap->a_vp;

        return rrw_enter(&VTOI(vp)->i_lock, ap->a_flags & LK_RWFLAGS);
}

/*
 * Unlock an inode.
 */
int
cd9660_unlock(void *v)
{
        struct vop_unlock_args *ap = v;
        struct vnode *vp = ap->a_vp;

        rrw_exit(&VTOI(vp)->i_lock);
        return 0;
}

/*
 * Calculate the logical to physical mapping if not done already,
 * then call the device strategy routine.
 */
int
cd9660_strategy(void *v)
{
        struct vop_strategy_args *ap = v;
        struct buf *bp = ap->a_bp;
        struct vnode *vp = bp->b_vp;
        struct iso_node *ip;
        int error;
        int s;

        ip = VTOI(vp);
        if (vp->v_type == VBLK || vp->v_type == VCHR)
                panic("cd9660_strategy: spec");
        if (bp->b_blkno == bp->b_lblkno) {
                error = VOP_BMAP(vp, bp->b_lblkno, NULL, &bp->b_blkno, NULL);
                if (error) {
                        bp->b_error = error;
                        bp->b_flags |= B_ERROR;
                        s = splbio();
                        biodone(bp);
                        splx(s);
                        return (error);
                }
                if ((long)bp->b_blkno == -1)
                        clrbuf(bp);
        }
        if ((long)bp->b_blkno == -1) {
                s = splbio();
                biodone(bp);
                splx(s);
                return (0);
        }
        vp = ip->i_devvp;
        bp->b_dev = vp->v_rdev;
        VOP_STRATEGY(vp, bp);
        return (0);
}

/*
 * Print out the contents of an inode.
 */
int
cd9660_print(void *v)
{
#if defined(DEBUG) || defined(DIAGNOSTIC) || defined(VFSLCKDEBUG)
        printf("tag VT_ISOFS, isofs vnode\n");
#endif
        return (0);
}

/*
 * Check for a locked inode.
 */
int
cd9660_islocked(void *v)
{
        struct vop_islocked_args *ap = v;

        return rrw_status(&VTOI(ap->a_vp)->i_lock);
}

/*
 * Return POSIX pathconf information applicable to cd9660 filesystems.
 */
int
cd9660_pathconf(void *v)
{
        struct vop_pathconf_args *ap = v;
        int error = 0;

        switch (ap->a_name) {
        case _PC_LINK_MAX:
                *ap->a_retval = 1;
                break;
        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;
                break;
        case _PC_CHOWN_RESTRICTED:
                *ap->a_retval = 1;
                break;
        case _PC_NO_TRUNC:
                *ap->a_retval = 1;
                break;
        case _PC_TIMESTAMP_RESOLUTION:
                *ap->a_retval = 1000000000;     /* one billion nanoseconds */
                break;
        default:
                error = EINVAL;
                break;
        }

        return (error);
}

/*
 * Global vfs data structures for isofs
 */

/* Global vfs data structures for cd9660. */
const struct vops cd9660_vops = {
        .vop_lookup     = cd9660_lookup,
        .vop_create     = eopnotsupp,
        .vop_mknod      = eopnotsupp,
        .vop_open       = cd9660_open,
        .vop_close      = cd9660_close,
        .vop_access     = cd9660_access,
        .vop_getattr    = cd9660_getattr,
        .vop_setattr    = cd9660_setattr,
        .vop_read       = cd9660_read,
        .vop_write      = eopnotsupp,
        .vop_ioctl      = cd9660_ioctl,
        .vop_kqfilter   = cd9660_kqfilter,
        .vop_revoke     = vop_generic_revoke,
        .vop_fsync      = nullop,
        .vop_remove     = eopnotsupp,
        .vop_link       = cd9660_link,
        .vop_rename     = eopnotsupp,
        .vop_mkdir      = eopnotsupp,
        .vop_rmdir      = eopnotsupp,
        .vop_symlink    = cd9660_symlink,
        .vop_readdir    = cd9660_readdir,
        .vop_readlink   = cd9660_readlink,
        .vop_abortop    = vop_generic_abortop,
        .vop_inactive   = cd9660_inactive,
        .vop_reclaim    = cd9660_reclaim,
        .vop_lock       = cd9660_lock,
        .vop_unlock     = cd9660_unlock,
        .vop_bmap       = cd9660_bmap,
        .vop_strategy   = cd9660_strategy,
        .vop_print      = cd9660_print,
        .vop_islocked   = cd9660_islocked,
        .vop_pathconf   = cd9660_pathconf,
        .vop_advlock    = eopnotsupp,
        .vop_bwrite     = vop_generic_bwrite,
};

/* Special device vnode ops */
const struct vops cd9660_specvops = {
        .vop_access     = cd9660_access,
        .vop_getattr    = cd9660_getattr,
        .vop_setattr    = cd9660_setattr,
        .vop_inactive   = cd9660_inactive,
        .vop_reclaim    = cd9660_reclaim,
        .vop_lock       = cd9660_lock,
        .vop_unlock     = cd9660_unlock,
        .vop_print      = cd9660_print,
        .vop_islocked   = cd9660_islocked,

        /* XXX: Keep in sync with spec_vops. */
        .vop_lookup     = vop_generic_lookup,
        .vop_create     = vop_generic_badop,
        .vop_mknod      = vop_generic_badop,
        .vop_open       = spec_open,
        .vop_close      = spec_close,
        .vop_read       = spec_read,
        .vop_write      = spec_write,
        .vop_ioctl      = spec_ioctl,
        .vop_kqfilter   = spec_kqfilter,
        .vop_revoke     = vop_generic_revoke,
        .vop_fsync      = spec_fsync,
        .vop_remove     = vop_generic_badop,
        .vop_link       = vop_generic_badop,
        .vop_rename     = vop_generic_badop,
        .vop_mkdir      = vop_generic_badop,
        .vop_rmdir      = vop_generic_badop,
        .vop_symlink    = vop_generic_badop,
        .vop_readdir    = vop_generic_badop,
        .vop_readlink   = vop_generic_badop,
        .vop_abortop    = vop_generic_badop,
        .vop_bmap       = vop_generic_bmap,
        .vop_strategy   = spec_strategy,
        .vop_pathconf   = spec_pathconf,
        .vop_advlock    = spec_advlock,
        .vop_bwrite     = vop_generic_bwrite,
};

#ifdef FIFO
const struct vops cd9660_fifovops = {
        .vop_access     = cd9660_access,
        .vop_getattr    = cd9660_getattr,
        .vop_setattr    = cd9660_setattr,
        .vop_inactive   = cd9660_inactive,
        .vop_reclaim    = cd9660_reclaim,
        .vop_lock       = cd9660_lock,
        .vop_unlock     = cd9660_unlock,
        .vop_print      = cd9660_print,
        .vop_islocked   = cd9660_islocked,
        .vop_bwrite     = vop_generic_bwrite,

        /* XXX: Keep in sync with fifo_vops. */
        .vop_lookup     = vop_generic_lookup,
        .vop_create     = vop_generic_badop,
        .vop_mknod      = vop_generic_badop,
        .vop_open       = fifo_open,
        .vop_close      = fifo_close,
        .vop_read       = fifo_read,
        .vop_write      = fifo_write,
        .vop_ioctl      = fifo_ioctl,
        .vop_kqfilter   = fifo_kqfilter,
        .vop_revoke     = vop_generic_revoke,
        .vop_fsync      = nullop,
        .vop_remove     = vop_generic_badop,
        .vop_link       = vop_generic_badop,
        .vop_rename     = vop_generic_badop,
        .vop_mkdir      = vop_generic_badop,
        .vop_rmdir      = vop_generic_badop,
        .vop_symlink    = vop_generic_badop,
        .vop_readdir    = vop_generic_badop,
        .vop_readlink   = vop_generic_badop,
        .vop_abortop    = vop_generic_badop,
        .vop_bmap       = vop_generic_bmap,
        .vop_strategy   = vop_generic_badop,
        .vop_pathconf   = fifo_pathconf,
        .vop_advlock    = fifo_advlock,
};
#endif /* FIFO */

void filt_cd9660detach(struct knote *kn);
int filt_cd9660read(struct knote *kn, long hint);
int filt_cd9660write(struct knote *kn, long hint);
int filt_cd9660vnode(struct knote *kn, long hint);

const struct filterops cd9660read_filtops = {
        .f_flags        = FILTEROP_ISFD,
        .f_attach       = NULL,
        .f_detach       = filt_cd9660detach,
        .f_event        = filt_cd9660read,
};

const struct filterops cd9660write_filtops = {
        .f_flags        = FILTEROP_ISFD,
        .f_attach       = NULL,
        .f_detach       = filt_cd9660detach,
        .f_event        = filt_cd9660write,
};

const struct filterops cd9660vnode_filtops = {
        .f_flags        = FILTEROP_ISFD,
        .f_attach       = NULL,
        .f_detach       = filt_cd9660detach,
        .f_event        = filt_cd9660vnode,
};

int
cd9660_kqfilter(void *v)
{
        struct vop_kqfilter_args *ap = v;
        struct vnode *vp = ap->a_vp;
        struct knote *kn = ap->a_kn;

        switch (kn->kn_filter) {
        case EVFILT_READ:
                kn->kn_fop = &cd9660read_filtops;
                break;
        case EVFILT_WRITE:
                kn->kn_fop = &cd9660write_filtops;
                break;
        case EVFILT_VNODE:
                kn->kn_fop = &cd9660vnode_filtops;
                break;
        default:
                return (EINVAL);
        }

        kn->kn_hook = (caddr_t)vp;

        klist_insert_locked(&vp->v_klist, kn);

        return (0);
}

void
filt_cd9660detach(struct knote *kn)
{
        struct vnode *vp = (struct vnode *)kn->kn_hook;

        klist_remove_locked(&vp->v_klist, kn);
}

int
filt_cd9660read(struct knote *kn, long hint)
{
        struct vnode *vp = (struct vnode *)kn->kn_hook;
        struct iso_node *node = VTOI(vp);

        /*
         * filesystem is gone, so set the EOF flag and schedule 
         * the knote for deletion.
         */
        if (hint == NOTE_REVOKE) {
                kn->kn_flags |= (EV_EOF | EV_ONESHOT);
                return (1);
        }

        kn->kn_data = node->i_size - foffset(kn->kn_fp);
        if (kn->kn_data == 0 && kn->kn_sfflags & NOTE_EOF) {
                kn->kn_fflags |= NOTE_EOF;
                return (1);
        }

        if (kn->kn_flags & (__EV_POLL | __EV_SELECT))
                return (1);

        return (kn->kn_data != 0);
}

int
filt_cd9660write(struct knote *kn, long hint)
{
        /*
         * filesystem is gone, so set the EOF flag and schedule 
         * the knote for deletion.
         */
        if (hint == NOTE_REVOKE) {
                kn->kn_flags |= (EV_EOF | EV_ONESHOT);
                return (1);
        }

        kn->kn_data = 0;
        return (1);
}

int
filt_cd9660vnode(struct knote *kn, long hint)
{
        if (kn->kn_sfflags & hint)
                kn->kn_fflags |= hint;
        if (hint == NOTE_REVOKE) {
                kn->kn_flags |= EV_EOF;
                return (1);
        }
        return (kn->kn_fflags != 0);
}