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File: [cvs.NetBSD.org] / src / sys / fs / cd9660 / cd9660_vnops.c (download)

Revision 1.43, Mon Mar 18 19:35:35 2013 UTC (19 months, 1 week ago) by plunky
Branch: MAIN
CVS Tags: khorben-n900, agc-symver-base, agc-symver
Changes since 1.42: +3 -3 lines

C99 section 6.7.2.3 (Tags) Note 3 states that:

  A type specifier of the form

	enum identifier

  without an enumerator list shall only appear after the type it
  specifies is complete.

which means that we cannot pass an "enum vtype" argument to
kauth_access_action() without fully specifying the type first.
Unfortunately there is a complicated include file loop which
makes that difficult, so convert this minimal function into a
macro (and capitalize it).

(ok elad@)

/*	$NetBSD: cd9660_vnops.c,v 1.43 2013/03/18 19:35:35 plunky 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) 5/27/95
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: cd9660_vnops.c,v 1.43 2013/03/18 19:35:35 plunky Exp $");

#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/proc.h>
#include <sys/mount.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/dirent.h>
#include <sys/kauth.h>

#include <miscfs/fifofs/fifo.h>
#include <miscfs/genfs/genfs.h>
#include <miscfs/specfs/specdev.h>

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

/*
 * 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;
	off_t *cookies;
	int ncookies;
};

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

static int
cd9660_check_possible(struct vnode *vp, struct iso_node *ip, mode_t mode)
{

	/*
	 * Disallow write attempts unless the file is a socket,
	 * fifo, or a block or character device resident on the
	 * file system.
	 */
	if (mode & VWRITE) {
		switch (vp->v_type) {
		case VDIR:
		case VLNK:
		case VREG:
			return (EROFS);
		default:
			break;
		}
	}

	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.
 */
static int
cd9660_check_permitted(struct vnode *vp, struct iso_node *ip, mode_t mode,
    kauth_cred_t cred)
{

	return kauth_authorize_vnode(cred, KAUTH_ACCESS_ACTION(mode,
	    vp->v_type, ip->inode.iso_mode & ALLPERMS), vp, NULL,
	    genfs_can_access(vp->v_type, ip->inode.iso_mode & ALLPERMS,
	    ip->inode.iso_uid, ip->inode.iso_gid, mode, cred));
}

int
cd9660_access(void *v)
{
	struct vop_access_args /* {
		struct vnode *a_vp;
		int  a_mode;
		kauth_cred_t a_cred;
	} */ *ap = v;
	struct vnode *vp = ap->a_vp;
	struct iso_node *ip = VTOI(vp);
	int error;

	error = cd9660_check_possible(vp, ip, ap->a_mode);
	if (error)
		return error;

	error = cd9660_check_permitted(vp, ip, ap->a_mode, ap->a_cred);

	return error;
}

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

	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 = (char *)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_resid = MAXPATHLEN;
		UIO_SETUP_SYSSPACE(&auio);
		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;
	return (0);
}

/*
 * Vnode op for reading.
 */
int
cd9660_read(void *v)
{
	struct vop_read_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		int a_ioflag;
		kauth_cred_t a_cred;
	} */ *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 rasize, error = 0;
	long size, n, on;

	if (uio->uio_resid == 0)
		return (0);
	if (uio->uio_offset < 0)
		return (EINVAL);
	if (uio->uio_offset >= ip->i_size)
		return 0;
	ip->i_flag |= IN_ACCESS;
	imp = ip->i_mnt;

	if (vp->v_type == VREG) {
		const int advice = IO_ADV_DECODE(ap->a_ioflag);
		error = 0;

		while (uio->uio_resid > 0) {
			vsize_t bytelen = MIN(ip->i_size - uio->uio_offset,
					      uio->uio_resid);

			if (bytelen == 0)
				break;
			error = ubc_uiomove(&vp->v_uobj, uio, bytelen, advice,
			    UBC_READ | UBC_PARTIALOK | UBC_UNMAP_FLAG(vp));
			if (error)
				break;
		}
		goto out;
	}

	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 (lblktosize(imp, rablock) < ip->i_size) {
			rasize = blksize(imp, ip, rablock);
			error = breadn(vp, lbn, size, &rablock,
				       &rasize, 1, NOCRED, 0, &bp);
		} else {
			error = bread(vp, lbn, size, NOCRED, 0, &bp);
		}
		if (error) {
			return (error);
		}
		n = MIN(n, size - bp->b_resid);

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

out:
	return (error);
}

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 (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);
}

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
		    || memcmp(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;
		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
 */
int
cd9660_readdir(void *v)
{
	struct vop_readdir_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		kauth_cred_t a_cred;
		int *a_eofflag;
		off_t **a_cookies;
		int *a_ncookies;
	} */ *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;
	off_t *cookies = NULL;
	int ncookies = 0;

	if (vdp->v_type != VDIR)
		return (ENOTDIR);

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

	idp = (struct isoreaddir *)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 {
		ncookies = uio->uio_resid / _DIRENT_MINSIZE((struct dirent *)0);
		cookies = malloc(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_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, 0);
			error = cd9660_blkatoff(vdp, (off_t)idp->curroff,
					     NULL, &bp);
			if (error)
				break;
			entryoffsetinblock = 0;
		}
		/*
		 * Get pointer to next entry.
		 */
		KASSERT(bp != NULL);
		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;

		switch (imp->iso_ftype) {
		case ISO_FTYPE_RRIP:
			cd9660_rrip_getname(ep, idp->current.d_name, &namelen,
			    &idp->current.d_fileno, imp);
			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 */
			isofntrans(ep->name, idp->current.d_namlen,
				   idp->current.d_name, &namelen,
				   imp->iso_ftype == ISO_FTYPE_9660,
				   (imp->im_flags & ISOFSMNT_NOCASETRANS) == 0,
				   isonum_711(ep->flags)&4,
				   imp->im_joliet_level);
			switch (idp->current.d_name[0]) {
			case 0:
				idp->current.d_name[0] = '.';
				idp->current.d_namlen = 1;
				error = iso_uiodir(idp, &idp->current,
				    idp->curroff);
				break;
			case 1:
				strlcpy(idp->current.d_name, "..",
				    sizeof(idp->current.d_name));
				idp->current.d_namlen = 2;
				error = iso_uiodir(idp, &idp->current,
				    idp->curroff);
				break;
			default:
				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);
				break;
			}
		}
		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, 0);

	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;

int
cd9660_readlink(void *v)
{
	struct vop_readlink_args /* {
		struct vnode *a_vp;
		struct uio *a_uio;
		kauth_cred_t a_cred;
	} */ *ap = v;
	ISONODE	*ip;
	ISODIR	*dirp;
	ISOMNT	*imp;
	struct	buf *bp;
	struct	uio *uio;
	u_short	symlen;
	int	error;
	char	*symname;
	bool use_pnbuf;

	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, 0, &bp);
	if (error) {
		return (EINVAL);
	}

	/*
	 * Setup the directory pointer for this inode
	 */
	dirp = (ISODIR *)((char *)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, 0);
		return (EINVAL);
	}

	/*
	 * Now get a buffer
	 * Abuse a namei buffer for now.
	 */
	use_pnbuf = !VMSPACE_IS_KERNEL_P(uio->uio_vmspace) ||
	    uio->uio_iov->iov_len < MAXPATHLEN;
	if (use_pnbuf) {
		symname = PNBUF_GET();
	} else {
		symname = uio->uio_iov->iov_base;
	}

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

	/*
	 * return with the symbolic name to caller's.
	 */
	if (use_pnbuf) {
		error = uiomove(symname, symlen, uio);
		PNBUF_PUT(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 /* {
		struct vnode *a_dvp;
		struct vnode *a_vp;
		struct componentname *a_cnp;
	} */ *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 /* {
		struct vnode *a_dvp;
		struct vnode **a_vpp;
		struct componentname *a_cnp;
		struct vattr *a_vap;
		char *a_target;
	} */ *ap = v;

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

/*
 * 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 /* {
		struct vnode *a_vp;
		struct buf *a_bp;
	} */ *ap = v;
	struct buf *bp = ap->a_bp;
	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");
	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;
			biodone(bp);
			return (error);
		}
		if ((long)bp->b_blkno == -1)
			clrbuf(bp);
	}
	if ((long)bp->b_blkno == -1) {
		biodone(bp);
		return (0);
	}
	vp = ip->i_devvp;
	return (VOP_STRATEGY(vp, bp));
}

/*
 * Print out the contents of an inode.
 */
/*ARGSUSED*/
int
cd9660_print(void *v)
{

	printf("tag VT_ISOFS, isofs vnode\n");
	return (0);
}

/*
 * Return POSIX pathconf information applicable to cd9660 filesystems.
 */
int
cd9660_pathconf(void *v)
{
	struct vop_pathconf_args /* {
		struct vnode *a_vp;
		int a_name;
		register_t *a_retval;
	} */ *ap = v;
	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 = ISO_MAXNAMLEN;
		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);
	case _PC_SYNC_IO:
		*ap->a_retval = 1;
		return (0);
	case _PC_FILESIZEBITS:
		*ap->a_retval = 32;
		return (0);
	default:
		return (EINVAL);
	}
	/* NOTREACHED */
}

/*
 * Allow changing the size for special files (and fifos).
 */
int
cd9660_setattr(void *v)
{
	struct vop_setattr_args /* {
		struct vnodeop_desc *a_desc;
		struct vnode *a_vp;
		struct vattr *a_vap;
		kauth_cred_t a_cred;
		struct proc *a_p;
	} */ *ap = v;
	struct vattr *vap = ap->a_vap;
	struct vnode *vp = ap->a_vp;

	/*
	 * Only size is changeable.
	 */
	if (vap->va_type != VNON
	    || vap->va_nlink != (nlink_t)VNOVAL
	    || vap->va_fsid != VNOVAL
	    || vap->va_fileid != VNOVAL
	    || vap->va_blocksize != VNOVAL
	    || vap->va_rdev != (dev_t)VNOVAL
	    || (int)vap->va_bytes != VNOVAL
	    || vap->va_gen != VNOVAL
	    || vap->va_flags != 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 EOPNOTSUPP;

	if (vap->va_size != VNOVAL
	    && vp->v_type != VCHR
	    && vp->v_type != VBLK
	    && vp->v_type != VFIFO)
		return EOPNOTSUPP;

	return 0;
}

/*
 * Global vfs data structures for isofs
 */
#define	cd9660_create	genfs_eopnotsupp
#define	cd9660_mknod	genfs_eopnotsupp
#define	cd9660_write	genfs_eopnotsupp
#define	cd9660_fsync	genfs_nullop
#define	cd9660_remove	genfs_eopnotsupp
#define	cd9660_rename	genfs_eopnotsupp
#define	cd9660_mkdir	genfs_eopnotsupp
#define	cd9660_rmdir	genfs_eopnotsupp
#define	cd9660_advlock	genfs_einval
#define	cd9660_bwrite	genfs_eopnotsupp
#define cd9660_revoke	genfs_revoke

/*
 * Global vfs data structures for cd9660
 */
int (**cd9660_vnodeop_p)(void *);
const struct vnodeopv_entry_desc cd9660_vnodeop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, cd9660_lookup },		/* lookup */
	{ &vop_create_desc, cd9660_create },		/* create */
	{ &vop_mknod_desc, cd9660_mknod },		/* mknod */
	{ &vop_open_desc, cd9660_open },		/* open */
	{ &vop_close_desc, cd9660_close },		/* close */
	{ &vop_access_desc, cd9660_access },		/* access */
	{ &vop_getattr_desc, cd9660_getattr },		/* getattr */
	{ &vop_setattr_desc, cd9660_setattr },		/* setattr */
	{ &vop_read_desc, cd9660_read },		/* read */
	{ &vop_write_desc, cd9660_write },		/* write */
	{ &vop_fcntl_desc, genfs_fcntl },		/* fcntl */
	{ &vop_ioctl_desc, cd9660_ioctl },		/* ioctl */
	{ &vop_poll_desc, cd9660_poll },		/* poll */
	{ &vop_revoke_desc, cd9660_revoke },		/* revoke */
	{ &vop_mmap_desc, cd9660_mmap },		/* mmap */
	{ &vop_fsync_desc, cd9660_fsync },		/* fsync */
	{ &vop_seek_desc, cd9660_seek },		/* seek */
	{ &vop_remove_desc, cd9660_remove },		/* remove */
	{ &vop_link_desc, cd9660_link },		/* link */
	{ &vop_rename_desc, cd9660_rename },		/* rename */
	{ &vop_mkdir_desc, cd9660_mkdir },		/* mkdir */
	{ &vop_rmdir_desc, cd9660_rmdir },		/* rmdir */
	{ &vop_symlink_desc, cd9660_symlink },		/* symlink */
	{ &vop_readdir_desc, cd9660_readdir },		/* readdir */
	{ &vop_readlink_desc, cd9660_readlink },	/* readlink */
	{ &vop_abortop_desc, cd9660_abortop },		/* abortop */
	{ &vop_inactive_desc, cd9660_inactive },	/* inactive */
	{ &vop_reclaim_desc, cd9660_reclaim },		/* reclaim */
	{ &vop_lock_desc, genfs_lock },			/* lock */
	{ &vop_unlock_desc, genfs_unlock },		/* unlock */
	{ &vop_bmap_desc, cd9660_bmap },		/* bmap */
	{ &vop_strategy_desc, cd9660_strategy },	/* strategy */
	{ &vop_print_desc, cd9660_print },		/* print */
	{ &vop_islocked_desc, genfs_islocked },		/* islocked */
	{ &vop_pathconf_desc, cd9660_pathconf },	/* pathconf */
	{ &vop_advlock_desc, cd9660_advlock },		/* advlock */
	{ &vop_bwrite_desc, vn_bwrite },		/* bwrite */
	{ &vop_getpages_desc, genfs_getpages },		/* getpages */
	{ &vop_putpages_desc, genfs_putpages },		/* putpages */
	{ NULL, NULL }
};
const struct vnodeopv_desc cd9660_vnodeop_opv_desc =
	{ &cd9660_vnodeop_p, cd9660_vnodeop_entries };

/*
 * Special device vnode ops
 */
int (**cd9660_specop_p)(void *);
const struct vnodeopv_entry_desc cd9660_specop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, spec_lookup },		/* lookup */
	{ &vop_create_desc, spec_create },		/* create */
	{ &vop_mknod_desc, spec_mknod },		/* mknod */
	{ &vop_open_desc, spec_open },			/* open */
	{ &vop_close_desc, spec_close },		/* close */
	{ &vop_access_desc, cd9660_access },		/* access */
	{ &vop_getattr_desc, cd9660_getattr },		/* getattr */
	{ &vop_setattr_desc, cd9660_setattr },		/* setattr */
	{ &vop_read_desc, spec_read },			/* read */
	{ &vop_write_desc, spec_write },		/* write */
	{ &vop_fcntl_desc, genfs_fcntl },		/* fcntl */
	{ &vop_ioctl_desc, spec_ioctl },		/* ioctl */
	{ &vop_poll_desc, spec_poll },			/* poll */
	{ &vop_kqfilter_desc, spec_kqfilter },		/* kqfilter */
	{ &vop_revoke_desc, spec_revoke },		/* revoke */
	{ &vop_mmap_desc, spec_mmap },			/* mmap */
	{ &vop_fsync_desc, spec_fsync },		/* fsync */
	{ &vop_seek_desc, spec_seek },			/* seek */
	{ &vop_remove_desc, spec_remove },		/* remove */
	{ &vop_link_desc, spec_link },			/* link */
	{ &vop_rename_desc, spec_rename },		/* rename */
	{ &vop_mkdir_desc, spec_mkdir },		/* mkdir */
	{ &vop_rmdir_desc, spec_rmdir },		/* rmdir */
	{ &vop_symlink_desc, spec_symlink },		/* symlink */
	{ &vop_readdir_desc, spec_readdir },		/* readdir */
	{ &vop_readlink_desc, spec_readlink },		/* readlink */
	{ &vop_abortop_desc, spec_abortop },		/* abortop */
	{ &vop_inactive_desc, cd9660_inactive },	/* inactive */
	{ &vop_reclaim_desc, cd9660_reclaim },		/* reclaim */
	{ &vop_lock_desc, genfs_lock },			/* lock */
	{ &vop_unlock_desc, genfs_unlock },		/* unlock */
	{ &vop_bmap_desc, spec_bmap },			/* bmap */
	{ &vop_strategy_desc, spec_strategy },		/* strategy */
	{ &vop_print_desc, cd9660_print },		/* print */
	{ &vop_islocked_desc, genfs_islocked },		/* islocked */
	{ &vop_pathconf_desc, spec_pathconf },		/* pathconf */
	{ &vop_advlock_desc, spec_advlock },		/* advlock */
	{ &vop_bwrite_desc, vn_bwrite },		/* bwrite */
	{ &vop_getpages_desc, spec_getpages },		/* getpages */
	{ &vop_putpages_desc, spec_putpages },		/* putpages */
	{ NULL, NULL }
};
const struct vnodeopv_desc cd9660_specop_opv_desc =
	{ &cd9660_specop_p, cd9660_specop_entries };

int (**cd9660_fifoop_p)(void *);
const struct vnodeopv_entry_desc cd9660_fifoop_entries[] = {
	{ &vop_default_desc, vn_default_error },
	{ &vop_lookup_desc, vn_fifo_bypass },		/* lookup */
	{ &vop_create_desc, vn_fifo_bypass },		/* create */
	{ &vop_mknod_desc, vn_fifo_bypass },		/* mknod */
	{ &vop_open_desc, vn_fifo_bypass },		/* open */
	{ &vop_close_desc, vn_fifo_bypass },		/* close */
	{ &vop_access_desc, cd9660_access },		/* access */
	{ &vop_getattr_desc, cd9660_getattr },		/* getattr */
	{ &vop_setattr_desc, cd9660_setattr },		/* setattr */
	{ &vop_read_desc, vn_fifo_bypass },		/* read */
	{ &vop_write_desc, vn_fifo_bypass },		/* write */
	{ &vop_fcntl_desc, genfs_fcntl },		/* fcntl */
	{ &vop_ioctl_desc, vn_fifo_bypass },		/* ioctl */
	{ &vop_poll_desc, vn_fifo_bypass },		/* poll */
	{ &vop_kqfilter_desc, vn_fifo_bypass },		/* kqfilter */
	{ &vop_revoke_desc, vn_fifo_bypass },		/* revoke */
	{ &vop_mmap_desc, vn_fifo_bypass },		/* mmap */
	{ &vop_fsync_desc, vn_fifo_bypass },		/* fsync */
	{ &vop_seek_desc, vn_fifo_bypass },		/* seek */
	{ &vop_remove_desc, vn_fifo_bypass },		/* remove */
	{ &vop_link_desc, vn_fifo_bypass } ,		/* link */
	{ &vop_rename_desc, vn_fifo_bypass },		/* rename */
	{ &vop_mkdir_desc, vn_fifo_bypass },		/* mkdir */
	{ &vop_rmdir_desc, vn_fifo_bypass },		/* rmdir */
	{ &vop_symlink_desc, vn_fifo_bypass },		/* symlink */
	{ &vop_readdir_desc, vn_fifo_bypass },		/* readdir */
	{ &vop_readlink_desc, vn_fifo_bypass },		/* readlink */
	{ &vop_abortop_desc, vn_fifo_bypass },		/* abortop */
	{ &vop_inactive_desc, cd9660_inactive },	/* inactive */
	{ &vop_reclaim_desc, cd9660_reclaim },		/* reclaim */
	{ &vop_lock_desc, genfs_lock },			/* lock */
	{ &vop_unlock_desc, genfs_unlock },		/* unlock */
	{ &vop_bmap_desc, vn_fifo_bypass },		/* bmap */
	{ &vop_strategy_desc, vn_fifo_bypass },		/* strategy */
	{ &vop_print_desc, cd9660_print },		/* print */
	{ &vop_islocked_desc, genfs_islocked },		/* islocked */
	{ &vop_pathconf_desc, vn_fifo_bypass },		/* pathconf */
	{ &vop_advlock_desc, vn_fifo_bypass },		/* advlock */
	{ &vop_bwrite_desc, vn_bwrite },		/* bwrite */
	{ &vop_putpages_desc, vn_fifo_bypass }, 	/* putpages */
	{ NULL, NULL }
};
const struct vnodeopv_desc cd9660_fifoop_opv_desc =
	{ &cd9660_fifoop_p, cd9660_fifoop_entries };