freebsd-dev/sys/fs/cd9660/cd9660_node.c
Warner Losh fbbd9655e5 Renumber copyright clause 4
Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by:	Jan Schaumann <jschauma@stevens.edu>
Pull Request:	https://github.com/freebsd/freebsd/pull/96
2017-02-28 23:42:47 +00:00

330 lines
8.5 KiB
C

/*-
* Copyright (c) 1982, 1986, 1989, 1994, 1995
* 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_node.c 8.2 (Berkeley) 1/23/94
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/mount.h>
#include <sys/bio.h>
#include <sys/buf.h>
#include <sys/vnode.h>
#include <sys/malloc.h>
#include <sys/stat.h>
#include <sys/mutex.h>
#include <fs/cd9660/iso.h>
#include <fs/cd9660/cd9660_node.h>
#include <fs/cd9660/cd9660_mount.h>
static unsigned cd9660_chars2ui(unsigned char *begin, int len);
/*
* Last reference to an inode, write the inode out and if necessary,
* truncate and deallocate the file.
*/
int
cd9660_inactive(ap)
struct vop_inactive_args /* {
struct vnode *a_vp;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
struct iso_node *ip = VTOI(vp);
int error = 0;
/*
* If we are done with the inode, reclaim it
* so that it can be reused immediately.
*/
if (ip->inode.iso_mode == 0)
vrecycle(vp);
return error;
}
/*
* Reclaim an inode so that it can be used for other purposes.
*/
int
cd9660_reclaim(ap)
struct vop_reclaim_args /* {
struct vnode *a_vp;
struct thread *a_td;
} */ *ap;
{
struct vnode *vp = ap->a_vp;
/*
* Destroy the vm object and flush associated pages.
*/
vnode_destroy_vobject(vp);
/*
* Remove the inode from its hash chain.
*/
vfs_hash_remove(vp);
/*
* Purge old data structures associated with the inode.
*/
free(vp->v_data, M_ISOFSNODE);
vp->v_data = NULL;
return (0);
}
/*
* File attributes
*/
void
cd9660_defattr(isodir, inop, bp, ftype)
struct iso_directory_record *isodir;
struct iso_node *inop;
struct buf *bp;
enum ISO_FTYPE ftype;
{
struct buf *bp2 = NULL;
struct iso_mnt *imp;
struct iso_extended_attributes *ap = NULL;
int off;
/* high sierra does not have timezone data, flag is one byte ahead */
if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
&isodir->date[6]: isodir->flags)&2) {
inop->inode.iso_mode = S_IFDIR;
/*
* If we return 2, fts() will assume there are no subdirectories
* (just links for the path and .), so instead we return 1.
*/
inop->inode.iso_links = 1;
} else {
inop->inode.iso_mode = S_IFREG;
inop->inode.iso_links = 1;
}
if (!bp
&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
&& (off = isonum_711(isodir->ext_attr_length))) {
cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
&bp2);
bp = bp2;
}
if (bp) {
ap = (struct iso_extended_attributes *)bp->b_data;
if (isonum_711(ap->version) == 1) {
if (!(ap->perm[0]&0x40))
inop->inode.iso_mode |= S_IXOTH;
if (!(ap->perm[0]&0x10))
inop->inode.iso_mode |= S_IROTH;
if (!(ap->perm[0]&4))
inop->inode.iso_mode |= S_IXGRP;
if (!(ap->perm[0]&1))
inop->inode.iso_mode |= S_IRGRP;
if (!(ap->perm[1]&0x40))
inop->inode.iso_mode |= S_IXUSR;
if (!(ap->perm[1]&0x10))
inop->inode.iso_mode |= S_IRUSR;
inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
} else
ap = NULL;
}
if (!ap) {
inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH;
inop->inode.iso_uid = (uid_t)0;
inop->inode.iso_gid = (gid_t)0;
}
if (bp2)
brelse(bp2);
}
/*
* Time stamps
*/
void
cd9660_deftstamp(isodir,inop,bp,ftype)
struct iso_directory_record *isodir;
struct iso_node *inop;
struct buf *bp;
enum ISO_FTYPE ftype;
{
struct buf *bp2 = NULL;
struct iso_mnt *imp;
struct iso_extended_attributes *ap = NULL;
int off;
if (!bp
&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
&& (off = isonum_711(isodir->ext_attr_length))) {
cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
&bp2);
bp = bp2;
}
if (bp) {
ap = (struct iso_extended_attributes *)bp->b_data;
if (ftype != ISO_FTYPE_HIGH_SIERRA
&& isonum_711(ap->version) == 1) {
if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
inop->inode.iso_ctime = inop->inode.iso_atime;
if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
inop->inode.iso_mtime = inop->inode.iso_ctime;
} else
ap = NULL;
}
if (!ap) {
cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype);
inop->inode.iso_atime = inop->inode.iso_ctime;
inop->inode.iso_mtime = inop->inode.iso_ctime;
}
if (bp2)
brelse(bp2);
}
int
cd9660_tstamp_conv7(pi,pu,ftype)
u_char *pi;
struct timespec *pu;
enum ISO_FTYPE ftype;
{
int crtime, days;
int y, m, d, hour, minute, second, tz;
y = pi[0] + 1900;
m = pi[1];
d = pi[2];
hour = pi[3];
minute = pi[4];
second = pi[5];
if(ftype != ISO_FTYPE_HIGH_SIERRA)
tz = ((signed char *)pi)[6]; /* Timezone value is signed. */
else
/* original high sierra misses timezone data */
tz = 0;
if (y < 1970) {
pu->tv_sec = 0;
pu->tv_nsec = 0;
return 0;
} else {
#ifdef ORIGINAL
/* computes day number relative to Sept. 19th,1989 */
/* don't even *THINK* about changing formula. It works! */
days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
#else
/*
* Changed :-) to make it relative to Jan. 1st, 1970
* and to disambiguate negative division
*/
days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
#endif
crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
/* timezone offset is unreliable on some disks */
if (-48 <= tz && tz <= 52)
crtime -= tz * 15 * 60;
}
pu->tv_sec = crtime;
pu->tv_nsec = 0;
return 1;
}
static u_int
cd9660_chars2ui(begin,len)
u_char *begin;
int len;
{
u_int rc;
for (rc = 0; --len >= 0;) {
rc *= 10;
rc += *begin++ - '0';
}
return rc;
}
int
cd9660_tstamp_conv17(pi,pu)
u_char *pi;
struct timespec *pu;
{
u_char buf[7];
/* year:"0001"-"9999" -> -1900 */
buf[0] = cd9660_chars2ui(pi,4) - 1900;
/* month: " 1"-"12" -> 1 - 12 */
buf[1] = cd9660_chars2ui(pi + 4,2);
/* day: " 1"-"31" -> 1 - 31 */
buf[2] = cd9660_chars2ui(pi + 6,2);
/* hour: " 0"-"23" -> 0 - 23 */
buf[3] = cd9660_chars2ui(pi + 8,2);
/* minute:" 0"-"59" -> 0 - 59 */
buf[4] = cd9660_chars2ui(pi + 10,2);
/* second:" 0"-"59" -> 0 - 59 */
buf[5] = cd9660_chars2ui(pi + 12,2);
/* difference of GMT */
buf[6] = pi[16];
return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT);
}
cd_ino_t
isodirino(isodir, imp)
struct iso_directory_record *isodir;
struct iso_mnt *imp;
{
cd_ino_t ino;
/*
* Note there is an inverse calculation in
* cd9660_vfsops.c:cd9660_vget_internal():
* ip->iso_start = ino >> imp->im_bshift;
* and also a calculation of the isodir pointer
* from an inode in cd9660_vnops.c:cd9660_readlink()
*/
ino = ((cd_ino_t)isonum_733(isodir->extent) +
isonum_711(isodir->ext_attr_length)) << imp->im_bshift;
return ino;
}