477 lines
11 KiB
C
477 lines
11 KiB
C
/* $NetBSD: cd9660_node.c,v 1.13 1994/12/24 15:30:07 cgd Exp $ */
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/*-
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* Copyright (c) 1982, 1986, 1989, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley
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* by Pace Willisson (pace@blitz.com). The Rock Ridge Extension
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* Support code is derived from software contributed to Berkeley
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* by Atsushi Murai (amurai@spec.co.jp).
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* @(#)cd9660_node.c 8.5 (Berkeley) 12/5/94
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*/
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <sys/file.h>
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#include <sys/buf.h>
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#include <sys/vnode.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/stat.h>
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#include <isofs/cd9660/iso.h>
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#include <isofs/cd9660/cd9660_node.h>
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#include <isofs/cd9660/iso_rrip.h>
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/*
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* Structures associated with iso_node caching.
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*/
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struct iso_node **isohashtbl;
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u_long isohash;
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#define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash)
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#ifdef ISODEVMAP
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struct iso_node **idvhashtbl;
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u_long idvhash;
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#define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash)
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#endif
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int prtactive; /* 1 => print out reclaim of active vnodes */
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/*
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* Initialize hash links for inodes and dnodes.
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*/
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int
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cd9660_init()
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{
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isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash);
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#ifdef ISODEVMAP
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idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, &idvhash);
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#endif
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}
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#ifdef ISODEVMAP
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/*
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* Enter a new node into the device hash list
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*/
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struct iso_dnode *
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iso_dmap(device, inum, create)
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dev_t device;
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ino_t inum;
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int create;
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{
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register struct iso_dnode **dpp, *dp, *dq;
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dpp = &idvhashtbl[DNOHASH(device, inum)];
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for (dp = *dpp;; dp = dp->d_next) {
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if (dp == NULL)
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return (NULL);
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if (inum == dp->i_number && device == dp->i_dev)
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return (dp);
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if (!create)
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return (NULL);
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MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE,
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M_WAITOK);
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dp->i_dev = dev;
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dp->i_number = ino;
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if (dq = *dpp)
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dq->d_prev = dp->d_next;
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dp->d_next = dq;
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dp->d_prev = dpp;
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*dpp = dp;
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return (dp);
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}
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void
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iso_dunmap(device)
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dev_t device;
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{
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struct iso_dnode **dpp, *dp, *dq;
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for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) {
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for (dp = *dpp; dp != NULL; dp = dq)
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dq = dp->d_next;
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if (device == dp->i_dev) {
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if (dq)
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dq->d_prev = dp->d_prev;
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*dp->d_prev = dq;
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FREE(dp, M_CACHE);
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}
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}
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}
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}
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#endif
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/*
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* Use the device/inum pair to find the incore inode, and return a pointer
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* to it. If it is in core, but locked, wait for it.
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*/
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struct vnode *
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cd9660_ihashget(device, inum)
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dev_t device;
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ino_t inum;
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{
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register struct iso_node *ip;
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struct vnode *vp;
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for (;;)
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for (ip = isohashtbl[INOHASH(device, inum)];; ip = ip->i_next) {
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if (ip == NULL)
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return (NULL);
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if (inum == ip->i_number && device == ip->i_dev) {
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if (ip->i_flag & IN_LOCKED) {
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ip->i_flag |= IN_WANTED;
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sleep(ip, PINOD);
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break;
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}
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vp = ITOV(ip);
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if (!vget(vp, 1))
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return (vp);
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break;
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}
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}
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/* NOTREACHED */
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}
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/*
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* Insert the inode into the hash table, and return it locked.
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*/
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void
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cd9660_ihashins(ip)
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struct iso_node *ip;
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{
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struct iso_node **ipp, *iq;
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ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)];
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if (iq = *ipp)
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iq->i_prev = &ip->i_next;
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ip->i_next = iq;
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ip->i_prev = ipp;
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*ipp = ip;
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if (ip->i_flag & IN_LOCKED)
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panic("cd9660_ihashins: already locked");
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if (curproc)
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ip->i_lockholder = curproc->p_pid;
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else
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ip->i_lockholder = -1;
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ip->i_flag |= IN_LOCKED;
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}
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/*
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* Remove the inode from the hash table.
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*/
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void
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cd9660_ihashrem(ip)
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register struct iso_node *ip;
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{
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register struct iso_node *iq;
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if (iq = ip->i_next)
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iq->i_prev = ip->i_prev;
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*ip->i_prev = iq;
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#ifdef DIAGNOSTIC
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ip->i_next = NULL;
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ip->i_prev = NULL;
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#endif
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}
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/*
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* Last reference to an inode, write the inode out and if necessary,
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* truncate and deallocate the file.
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*/
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int
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cd9660_inactive(ap)
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struct vop_inactive_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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struct vnode *vp = ap->a_vp;
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register struct iso_node *ip = VTOI(vp);
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int error = 0;
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if (prtactive && vp->v_usecount != 0)
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vprint("cd9660_inactive: pushing active", vp);
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ip->i_flag = 0;
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/*
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* If we are done with the inode, reclaim it
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* so that it can be reused immediately.
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*/
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if (vp->v_usecount == 0 && ip->inode.iso_mode == 0)
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vgone(vp);
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return error;
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}
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/*
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* Reclaim an inode so that it can be used for other purposes.
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*/
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int
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cd9660_reclaim(ap)
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struct vop_reclaim_args /* {
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struct vnode *a_vp;
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} */ *ap;
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{
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register struct vnode *vp = ap->a_vp;
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register struct iso_node *ip = VTOI(vp);
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if (prtactive && vp->v_usecount != 0)
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vprint("cd9660_reclaim: pushing active", vp);
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/*
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* Remove the inode from its hash chain.
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*/
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cd9660_ihashrem(ip);
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/*
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* Purge old data structures associated with the inode.
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*/
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cache_purge(vp);
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if (ip->i_devvp) {
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vrele(ip->i_devvp);
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ip->i_devvp = 0;
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}
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FREE(vp->v_data, M_ISOFSNODE);
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vp->v_data = NULL;
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return (0);
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}
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/*
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* File attributes
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*/
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void
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cd9660_defattr(isodir, inop, bp)
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struct iso_directory_record *isodir;
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struct iso_node *inop;
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struct buf *bp;
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{
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struct buf *bp2 = NULL;
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struct iso_mnt *imp;
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struct iso_extended_attributes *ap = NULL;
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int off;
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if (isonum_711(isodir->flags)&2) {
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inop->inode.iso_mode = S_IFDIR;
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/*
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* If we return 2, fts() will assume there are no subdirectories
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* (just links for the path and .), so instead we return 1.
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*/
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inop->inode.iso_links = 1;
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} else {
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inop->inode.iso_mode = S_IFREG;
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inop->inode.iso_links = 1;
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}
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if (!bp
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&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
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&& (off = isonum_711(isodir->ext_attr_length))) {
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VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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&bp2);
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bp = bp2;
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}
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if (bp) {
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ap = (struct iso_extended_attributes *)bp->b_data;
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if (isonum_711(ap->version) == 1) {
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if (!(ap->perm[0]&0x40))
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inop->inode.iso_mode |= VEXEC >> 6;
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if (!(ap->perm[0]&0x10))
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inop->inode.iso_mode |= VREAD >> 6;
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if (!(ap->perm[0]&4))
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inop->inode.iso_mode |= VEXEC >> 3;
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if (!(ap->perm[0]&1))
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inop->inode.iso_mode |= VREAD >> 3;
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if (!(ap->perm[1]&0x40))
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inop->inode.iso_mode |= VEXEC;
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if (!(ap->perm[1]&0x10))
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inop->inode.iso_mode |= VREAD;
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inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */
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inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */
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} else
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ap = NULL;
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}
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if (!ap) {
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inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
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inop->inode.iso_uid = (uid_t)0;
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inop->inode.iso_gid = (gid_t)0;
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}
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if (bp2)
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brelse(bp2);
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}
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/*
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* Time stamps
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*/
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void
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cd9660_deftstamp(isodir,inop,bp)
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struct iso_directory_record *isodir;
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struct iso_node *inop;
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struct buf *bp;
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{
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struct buf *bp2 = NULL;
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struct iso_mnt *imp;
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struct iso_extended_attributes *ap = NULL;
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int off;
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if (!bp
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&& ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT)
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&& (off = isonum_711(isodir->ext_attr_length))) {
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VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL,
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&bp2);
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bp = bp2;
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}
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if (bp) {
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ap = (struct iso_extended_attributes *)bp->b_data;
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if (isonum_711(ap->version) == 1) {
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if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime))
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cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime);
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if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime))
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inop->inode.iso_ctime = inop->inode.iso_atime;
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if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime))
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inop->inode.iso_mtime = inop->inode.iso_ctime;
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} else
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ap = NULL;
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}
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if (!ap) {
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cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime);
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inop->inode.iso_atime = inop->inode.iso_ctime;
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inop->inode.iso_mtime = inop->inode.iso_ctime;
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}
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if (bp2)
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brelse(bp2);
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}
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int
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cd9660_tstamp_conv7(pi,pu)
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u_char *pi;
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struct timespec *pu;
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{
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int crtime, days;
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int y, m, d, hour, minute, second, tz;
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y = pi[0] + 1900;
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m = pi[1];
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d = pi[2];
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hour = pi[3];
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minute = pi[4];
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second = pi[5];
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tz = pi[6];
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if (y < 1970) {
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pu->ts_sec = 0;
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pu->ts_nsec = 0;
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return 0;
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} else {
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#ifdef ORIGINAL
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/* computes day number relative to Sept. 19th,1989 */
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/* don't even *THINK* about changing formula. It works! */
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days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100;
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#else
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/*
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* Changed :-) to make it relative to Jan. 1st, 1970
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* and to disambiguate negative division
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*/
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days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239;
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#endif
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crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second;
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/* timezone offset is unreliable on some disks */
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if (-48 <= tz && tz <= 52)
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crtime -= tz * 15 * 60;
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}
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pu->ts_sec = crtime;
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pu->ts_nsec = 0;
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return 1;
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}
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static u_int
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cd9660_chars2ui(begin,len)
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u_char *begin;
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int len;
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{
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u_int rc;
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for (rc = 0; --len >= 0;) {
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rc *= 10;
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rc += *begin++ - '0';
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}
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return rc;
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}
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int
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cd9660_tstamp_conv17(pi,pu)
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u_char *pi;
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struct timespec *pu;
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{
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u_char buf[7];
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/* year:"0001"-"9999" -> -1900 */
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buf[0] = cd9660_chars2ui(pi,4) - 1900;
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/* month: " 1"-"12" -> 1 - 12 */
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buf[1] = cd9660_chars2ui(pi + 4,2);
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/* day: " 1"-"31" -> 1 - 31 */
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buf[2] = cd9660_chars2ui(pi + 6,2);
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/* hour: " 0"-"23" -> 0 - 23 */
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buf[3] = cd9660_chars2ui(pi + 8,2);
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/* minute:" 0"-"59" -> 0 - 59 */
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buf[4] = cd9660_chars2ui(pi + 10,2);
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/* second:" 0"-"59" -> 0 - 59 */
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buf[5] = cd9660_chars2ui(pi + 12,2);
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/* difference of GMT */
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buf[6] = pi[16];
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return cd9660_tstamp_conv7(buf,pu);
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}
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ino_t
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isodirino(isodir, imp)
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struct iso_directory_record *isodir;
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struct iso_mnt *imp;
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{
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ino_t ino;
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ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
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<< imp->im_bshift;
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return (ino);
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}
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