/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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.
 */

#include <sys/param.h>
#include <sys/systm.h>
#include <sys/namei.h>
#include <sys/kernel.h>
#include <sys/conf.h>
#include <sys/stat.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/unistd.h>
#include <sys/filio.h>
#include <sys/sysctl.h>

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

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

static vop_setattr_t    cd9660_setattr;
static vop_open_t       cd9660_open;
static vop_access_t     cd9660_access;
static vop_getattr_t    cd9660_getattr;
static vop_ioctl_t      cd9660_ioctl;
static vop_pathconf_t   cd9660_pathconf;
static vop_read_t       cd9660_read;
struct isoreaddir;
static int iso_uiodir(struct isoreaddir *idp, struct dirent *dp, off_t off);
static int iso_shipdir(struct isoreaddir *idp);
static vop_readdir_t    cd9660_readdir;
static vop_readlink_t   cd9660_readlink;
static vop_strategy_t   cd9660_strategy;
static vop_vptofh_t     cd9660_vptofh;
static vop_getpages_t   cd9660_getpages;

/*
 * Setattr call. Only allowed for block and character special devices.
 */
static 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:
                        return (EROFS);
                case VCHR:
                case VBLK:
                case VSOCK:
                case VFIFO:
                case VNON:
                case VBAD:
                case VMARKER:
                        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.
 */
/* ARGSUSED */
static int
cd9660_access(struct vop_access_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct iso_node *ip = VTOI(vp);
        accmode_t accmode = ap->a_accmode;
        accmode_t file_mode;
        uid_t uid;
        gid_t gid;

        if (VN_ISDEV(vp))
                return (EOPNOTSUPP);

        /*
         * Disallow write attempts unless the file is a socket,
         * fifo, or a block or character device resident on the
         * filesystem.
         */
        if (accmode & VWRITE) {
                switch (vp->v_type) {
                case VDIR:
                case VLNK:
                case VREG:
                        return (EROFS);
                        /* NOT REACHED */
                default:
                        break;
                }
        }

        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 (vaccess(vp->v_type, file_mode, uid,
            gid, ap->a_accmode, ap->a_cred));
}

static int
cd9660_open(struct vop_open_args *ap)
{
        struct vnode *vp = ap->a_vp;
        struct iso_node *ip = VTOI(vp);

        if (VN_ISDEV(vp))
                return (EOPNOTSUPP);

        vnode_create_vobject(vp, ip->i_size, ap->a_td);
        return (0);
}

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    = dev2udev(ip->i_mnt->im_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_rdev    = VN_ISDEV(vp) ? ip->inode.iso_rdev : NODEV;

        vap->va_size    = 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_td = curthread;
                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);
        }
        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.
 */
static int
cd9660_ioctl(struct vop_ioctl_args *ap)
{
        struct vnode *vp;
        struct iso_node *ip;
        int error;

        vp = ap->a_vp;
        vn_lock(vp, LK_SHARED | LK_RETRY);
        if (VN_IS_DOOMED(vp)) {
                VOP_UNLOCK(vp);
                return (EBADF);
        }
        if (VN_ISDEV(vp)) {
                VOP_UNLOCK(vp);
                return (EOPNOTSUPP);
        }

        ip = VTOI(vp);
        error = 0;

        switch (ap->a_command) {
        case FIOGETLBA:
                *(int *)(ap->a_data) = ip->iso_start;
                break;
        default:
                error = ENOTTY;
                break;
        }

        VOP_UNLOCK(vp);
        return (error);
}

/*
 * Vnode op for reading.
 */
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 diff;
        int rasize, error = 0;
        int seqcount;
        long size, n, on;

        if (VN_ISDEV(vp))
                return (EOPNOTSUPP);

        seqcount = ap->a_ioflag >> IO_SEQSHIFT;

        if (uio->uio_resid == 0)
                return (0);
        if (uio->uio_offset < 0)
                return (EINVAL);
        imp = ip->i_mnt;
        do {
                lbn = lblkno(imp, uio->uio_offset);
                on = blkoff(imp, uio->uio_offset);
                n = MIN(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;
                if ((vp->v_mount->mnt_flag & MNT_NOCLUSTERR) == 0) {
                        if (lblktosize(imp, rablock) < ip->i_size)
                                error = cluster_read(vp, (off_t)ip->i_size,
                                         lbn, size, NOCRED, uio->uio_resid,
                                         (ap->a_ioflag >> 16), 0, &bp);
                        else
                                error = bread(vp, lbn, size, NOCRED, &bp);
                } else {
                        if (seqcount > 1 &&
                            lblktosize(imp, rablock) < ip->i_size) {
                                rasize = blksize(imp, ip, rablock);
                                error = breadn(vp, lbn, size, &rablock,
                                               &rasize, 1, NOCRED, &bp);
                        } else
                                error = bread(vp, lbn, size, NOCRED, &bp);
                }
                if (error != 0)
                        return (error);
                n = MIN(n, size - bp->b_resid);

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

/*
 * 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;
        uint64_t *cookies;
        int ncookies;
};

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

        dp->d_reclen = GENERIC_DIRSIZ(dp);
        dirent_terminate(dp);

        if (idp->uio->uio_resid < dp->d_reclen) {
                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(dp, dp->d_reclen, idp->uio)) != 0)
                return (error);
        idp->uio_off = off;
        return (0);
}

static 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;
        assoc = (cl > 1) && (*cname == ASSOCCHAR);
        if (assoc) {
                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) {
                                if ((error = iso_uiodir(idp,&idp->assocent,idp->assocoff)) != 0)
                                        return (error);
                                idp->assocent.d_namlen = 0;
                        }
                        if (idp->saveent.d_namlen) {
                                if ((error = iso_uiodir(idp,&idp->saveent,idp->saveoff)) != 0)
                                        return (error);
                                idp->saveent.d_namlen = 0;
                        }
                }
        }
        idp->current.d_reclen = GENERIC_DIRSIZ(&idp->current);
        if (assoc) {
                idp->assocoff = idp->curroff;
                memcpy(&idp->assocent, &idp->current, idp->current.d_reclen);
        } else {
                idp->saveoff = idp->curroff;
                memcpy(&idp->saveent, &idp->current, idp->current.d_reclen);
        }
        return (0);
}

/*
 * Vnode op for readdir
 */
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;
        u_int ncookies = 0;
        uint64_t *cookies = NULL;
        ino_t ino;

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

        idp = malloc(sizeof(*idp), M_TEMP, M_WAITOK);
        idp->saveent.d_namlen = idp->assocent.d_namlen = 0;
        /*
         * 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;
        if (ap->a_ncookies == NULL) {
                idp->cookies = NULL;
        } else {
                /*
                 * Guess the number of cookies needed.
                 */
                ncookies = uio->uio_resid / 16;
                cookies = malloc(ncookies * sizeof(*cookies), M_TEMP, M_WAITOK);
                idp->cookies = cookies;
                idp->ncookies = ncookies;
        }
        idp->eofflag = 1;
        idp->curroff = uio->uio_offset;
        idp->uio_off = uio->uio_offset;

        if ((entryoffsetinblock = idp->curroff & bmask) &&
            (error = cd9660_blkatoff(vdp, (off_t)idp->curroff, NULL, &bp))) {
                free(idp, M_TEMP);
                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);
                        if ((error =
                            cd9660_blkatoff(vdp, (off_t)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.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)
                        idp->current.d_fileno = isodirino(ep, imp);
                else
                        idp->current.d_fileno = dbtob(bp->b_blkno) +
                                entryoffsetinblock;

                idp->curroff += reclen;
                /* NOTE: d_off is the offset of *next* entry. */
                idp->current.d_off = idp->curroff;

                switch (imp->iso_ftype) {
                case ISO_FTYPE_RRIP:
                        ino = idp->current.d_fileno;
                        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 || ISO_FTYPE_HIGH_SIERRA*/
                        strcpy(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,
                                           imp->im_flags,
                                           imp->im_d2l);
                                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 (ap->a_ncookies != NULL) {
                if (error)
                        free(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;

        free(idp, M_TEMP);

        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;
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,
                      (ip->i_number >> imp->im_bshift) <<
                      (imp->im_bshift - DEV_BSHIFT),
                      imp->logical_block_size, NOCRED, &bp);
        if (error) {
                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 = uma_zalloc(namei_zone, 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)
                        uma_zfree(namei_zone, 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);
                uma_zfree(namei_zone, 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.
 */
static int
cd9660_strategy(struct vop_strategy_args *ap)
{
        struct buf *bp = ap->a_bp;
        struct vnode *vp = ap->a_vp;
        struct iso_node *ip;
        struct bufobj *bo;

        ip = VTOI(vp);
        if (VN_ISDEV(vp))
                panic("cd9660_strategy: spec");
        if (bp->b_blkno == bp->b_lblkno) {
                bp->b_blkno = (ip->iso_start + bp->b_lblkno) <<
                    (ip->i_mnt->im_bshift - DEV_BSHIFT);
        }
        bp->b_iooffset = dbtob(bp->b_blkno);
        bo = ip->i_mnt->im_bo;
        BO_STRATEGY(bo, bp);
        return (0);
}

/*
 * Return POSIX pathconf information applicable to cd9660 filesystems.
 */
static int
cd9660_pathconf(struct vop_pathconf_args *ap)
{

        switch (ap->a_name) {
        case _PC_FILESIZEBITS:
                *ap->a_retval = 32;
                return (0);
        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_SYMLINK_MAX:
                if (VTOI(ap->a_vp)->i_mnt->iso_ftype == ISO_FTYPE_RRIP) {
                        *ap->a_retval = MAXPATHLEN;
                        return (0);
                }
                return (EINVAL);
        case _PC_NO_TRUNC:
                *ap->a_retval = 1;
                return (0);
        default:
                return (vop_stdpathconf(ap));
        }
        /* NOTREACHED */
}

_Static_assert(sizeof(struct ifid) <= sizeof(struct fid),
    "struct ifid must be no larger than struct fid");

/*
 * Vnode pointer to File handle
 */
static int
cd9660_vptofh(struct vop_vptofh_args *ap)
{
        struct ifid ifh;
        struct iso_node *ip = VTOI(ap->a_vp);

        ifh.ifid_len = sizeof(struct ifid);

        ifh.ifid_ino = ip->i_number;
        ifh.ifid_start = ip->iso_start;
        /*
         * This intentionally uses sizeof(ifh) in order to not copy stack
         * garbage on ILP32.
         */
        memcpy(ap->a_fhp, &ifh, sizeof(ifh));

#ifdef  ISOFS_DBG
        printf("vptofh: ino %jd, start %ld\n",
            (uintmax_t)ifh.ifid_ino, ifh.ifid_start);
#endif

        return (0);
}

SYSCTL_NODE(_vfs, OID_AUTO, cd9660, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
    "cd9660 filesystem");
static int use_buf_pager = 1;
SYSCTL_INT(_vfs_cd9660, OID_AUTO, use_buf_pager, CTLFLAG_RWTUN,
    &use_buf_pager, 0,
    "Use buffer pager instead of bmap");

static daddr_t
cd9660_gbp_getblkno(struct vnode *vp, vm_ooffset_t off)
{

        return (lblkno(VTOI(vp)->i_mnt, off));
}

static int
cd9660_gbp_getblksz(struct vnode *vp, daddr_t lbn, long *sz)
{
        struct iso_node *ip;

        ip = VTOI(vp);
        *sz = blksize(ip->i_mnt, ip, lbn);
        return (0);
}

static int
cd9660_getpages(struct vop_getpages_args *ap)
{
        struct vnode *vp;

        vp = ap->a_vp;
        if (VN_ISDEV(vp))
                return (EOPNOTSUPP);

        if (use_buf_pager)
                return (vfs_bio_getpages(vp, ap->a_m, ap->a_count,
                    ap->a_rbehind, ap->a_rahead, cd9660_gbp_getblkno,
                    cd9660_gbp_getblksz));
        return (vnode_pager_generic_getpages(vp, ap->a_m, ap->a_count,
            ap->a_rbehind, ap->a_rahead, NULL, NULL));
}

/*
 * Global vfs data structures for cd9660
 */
struct vop_vector cd9660_vnodeops = {
        .vop_default =          &default_vnodeops,
        .vop_open =             cd9660_open,
        .vop_access =           cd9660_access,
        .vop_bmap =             cd9660_bmap,
        .vop_cachedlookup =     cd9660_lookup,
        .vop_getattr =          cd9660_getattr,
        .vop_inactive =         cd9660_inactive,
        .vop_ioctl =            cd9660_ioctl,
        .vop_lookup =           vfs_cache_lookup,
        .vop_pathconf =         cd9660_pathconf,
        .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_vptofh =           cd9660_vptofh,
        .vop_getpages =         cd9660_getpages,
};
VFS_VOP_VECTOR_REGISTER(cd9660_vnodeops);

/*
 * Special device vnode ops
 */

struct vop_vector cd9660_fifoops = {
        .vop_default =          &fifo_specops,
        .vop_access =           cd9660_access,
        .vop_getattr =          cd9660_getattr,
        .vop_inactive =         cd9660_inactive,
        .vop_reclaim =          cd9660_reclaim,
        .vop_setattr =          cd9660_setattr,
        .vop_vptofh =           cd9660_vptofh,
};
VFS_VOP_VECTOR_REGISTER(cd9660_fifoops);