6e349b6b47
process won't possibly block before filling in the fsnode pointer (v_data) which might be dereferenced during a sync since the vnode is put on the mnt_vnodelist by getnewvnode.
666 lines
16 KiB
C
666 lines
16 KiB
C
/*-
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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 8.2 (Berkeley) 1/23/94
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* $Id: cd9660_node.c,v 1.12 1995/12/03 17:14:33 bde Exp $
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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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#define INOHSZ 512
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#if ((INOHSZ&(INOHSZ-1)) == 0)
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#define INOHASH(dev,ino) (((dev)+((ino)>>12))&(INOHSZ-1))
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#else
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#define INOHASH(dev,ino) (((unsigned)((dev)+((ino)>>12)))%INOHSZ)
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#endif
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union iso_ihead {
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union iso_ihead *ih_head[2];
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struct iso_node *ih_chain[2];
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} iso_ihead[INOHSZ];
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#ifdef ISODEVMAP
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#define DNOHSZ 64
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#if ((DNOHSZ&(DNOHSZ-1)) == 0)
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#define DNOHASH(dev,ino) (((dev)+((ino)>>12))&(DNOHSZ-1))
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#else
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#define DNOHASH(dev,ino) (((unsigned)((dev)+((ino)>>12)))%DNOHSZ)
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#endif
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union iso_dhead {
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union iso_dhead *dh_head[2];
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struct iso_dnode *dh_chain[2];
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} iso_dhead[DNOHSZ];
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#endif
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static unsigned cd9660_chars2ui __P((unsigned char *begin, int len));
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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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register int i;
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register union iso_ihead *ih = iso_ihead;
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#ifdef ISODEVMAP
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register union iso_dhead *dh = iso_dhead;
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#endif
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for (i = INOHSZ; --i >= 0; ih++) {
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ih->ih_head[0] = ih;
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ih->ih_head[1] = ih;
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}
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#ifdef ISODEVMAP
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for (i = DNOHSZ; --i >= 0; dh++) {
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dh->dh_head[0] = dh;
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dh->dh_head[1] = dh;
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}
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#endif
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return (0);
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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(dev,ino,create)
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dev_t dev;
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ino_t ino;
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int create;
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{
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struct iso_dnode *dp;
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union iso_dhead *dh;
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dh = &iso_dhead[DNOHASH(dev, ino)];
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for (dp = dh->dh_chain[0];
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dp != (struct iso_dnode *)dh;
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dp = dp->d_forw)
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if (ino == dp->i_number && dev == dp->i_dev)
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return dp;
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if (!create)
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return (struct iso_dnode *)0;
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MALLOC(dp,struct iso_dnode *,sizeof(struct iso_dnode),M_CACHE,M_WAITOK);
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dp->i_dev = dev;
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dp->i_number = ino;
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insque(dp,dh);
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return dp;
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}
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void
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iso_dunmap(dev)
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dev_t dev;
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{
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struct iso_dnode *dp, *dq;
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union iso_dhead *dh;
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for (dh = iso_dhead; dh < iso_dhead + DNOHSZ; dh++) {
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for (dp = dh->dh_chain[0];
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dp != (struct iso_dnode *)dh;
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dp = dq) {
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dq = dp->d_forw;
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if (dev == dp->i_dev) {
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remque(dp);
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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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* Look up a ISOFS dinode number to find its incore vnode.
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* If it is not in core, read it in from the specified device.
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* If it is in core, wait for the lock bit to clear, then
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* return the inode locked. Detection and handling of mount
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* points must be done by the calling routine.
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*/
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int
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iso_iget(xp, ino, relocated, ipp, isodir)
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struct iso_node *xp;
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ino_t ino;
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int relocated;
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struct iso_node **ipp;
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struct iso_directory_record *isodir;
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{
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dev_t dev = xp->i_dev;
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struct mount *mntp = ITOV(xp)->v_mount;
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register struct iso_node *ip, *iq;
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register struct vnode *vp;
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#ifdef ISODEVMAP
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register struct iso_dnode *dp;
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#endif
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struct vnode *nvp;
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struct buf *bp = NULL, *bp2 = NULL;
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union iso_ihead *ih;
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int error, result;
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struct iso_mnt *imp;
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ih = &iso_ihead[INOHASH(dev, ino)];
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loop:
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for (ip = ih->ih_chain[0];
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ip != (struct iso_node *)ih;
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ip = ip->i_forw) {
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if (ino != ip->i_number || dev != ip->i_dev)
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continue;
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if ((ip->i_flag&ILOCKED) != 0) {
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ip->i_flag |= IWANT;
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(void) tsleep((caddr_t)ip, PINOD, "isoigt", 0);
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goto loop;
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}
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if (vget(ITOV(ip), 1))
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goto loop;
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*ipp = ip;
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return 0;
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}
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/*
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* Do the MALLOC before the getnewvnode since doing so afterward
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* might cause a bogus v_data pointer to get dereferenced
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* elsewhere if MALLOC should block.
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*/
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MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE, M_WAITOK);
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/*
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* Allocate a new vnode/iso_node.
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*/
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if ((error = getnewvnode(VT_ISOFS, mntp, cd9660_vnodeop_p, &nvp))) {
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*ipp = NULL;
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FREE(ip, M_ISOFSNODE);
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return error;
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}
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bzero((caddr_t)ip, sizeof(struct iso_node));
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nvp->v_data = ip;
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ip->i_vnode = nvp;
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ip->i_flag = 0;
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ip->i_devvp = 0;
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ip->i_diroff = 0;
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ip->i_lockf = 0;
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/*
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* Put it onto its hash chain and lock it so that other requests for
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* this inode will block if they arrive while we are sleeping waiting
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* for old data structures to be purged or for the contents of the
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* disk portion of this inode to be read.
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*/
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ip->i_dev = dev;
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ip->i_number = ino;
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insque(ip, ih);
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ISO_ILOCK(ip);
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imp = VFSTOISOFS (mntp);
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ip->i_mnt = imp;
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ip->i_devvp = imp->im_devvp;
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VREF(ip->i_devvp);
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if (relocated) {
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/*
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* On relocated directories we must
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* read the `.' entry out of a dir.
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*/
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ip->iso_start = ino >> imp->im_bshift;
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if ((error = iso_blkatoff(ip,0,&bp))) {
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vrele(ip->i_devvp);
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remque(ip);
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ip->i_forw = ip;
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ip->i_back = ip;
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iso_iput(ip);
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*ipp = 0;
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return error;
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}
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isodir = (struct iso_directory_record *)bp->b_un.b_addr;
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}
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ip->iso_extent = isonum_733(isodir->extent);
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ip->i_size = isonum_733(isodir->size);
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ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent;
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vp = ITOV(ip);
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/*
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* Setup time stamp, attribute
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*/
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vp->v_type = VNON;
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switch (imp->iso_ftype) {
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default: /* ISO_FTYPE_9660 || ISO_FTYPE_HIGH_SIERRA */
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if ((imp->im_flags&ISOFSMNT_EXTATT)
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&& isonum_711(isodir->ext_attr_length))
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iso_blkatoff(ip,-isonum_711(isodir->ext_attr_length),
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&bp2);
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cd9660_defattr(isodir,ip,bp2,imp->iso_ftype );
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cd9660_deftstamp(isodir,ip,bp2,imp->iso_ftype );
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break;
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case ISO_FTYPE_RRIP:
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result = cd9660_rrip_analyze(isodir,ip,imp);
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break;
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}
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if (bp2)
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brelse(bp2);
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if (bp)
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brelse(bp);
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/*
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* Initialize the associated vnode
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*/
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vp->v_type = IFTOVT(ip->inode.iso_mode);
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if ( vp->v_type == VFIFO ) {
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vp->v_op = cd9660_fifoop_p;
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} else if ( vp->v_type == VCHR || vp->v_type == VBLK ) {
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/*
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* if device, look at device number table for translation
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*/
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#ifdef ISODEVMAP
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if (dp = iso_dmap(dev,ino,0))
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ip->inode.iso_rdev = dp->d_dev;
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#endif
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vp->v_op = cd9660_specop_p;
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if ((nvp = checkalias(vp, ip->inode.iso_rdev, mntp))) {
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/*
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* Reinitialize aliased inode.
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*/
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vp = nvp;
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iq = VTOI(vp);
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iq->i_vnode = vp;
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iq->i_flag = 0;
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ISO_ILOCK(iq);
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iq->i_dev = dev;
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iq->i_number = ino;
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iq->i_mnt = ip->i_mnt;
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bcopy(&ip->iso_extent,&iq->iso_extent,
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(char *)(ip + 1) - (char *)&ip->iso_extent);
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insque(iq, ih);
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/*
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* Discard unneeded vnode
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* (This introduces the need of INACTIVE modification)
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*/
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ip->inode.iso_mode = 0;
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iso_iput(ip);
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ip = iq;
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}
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}
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if (ip->iso_extent == imp->root_extent)
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vp->v_flag |= VROOT;
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*ipp = ip;
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return 0;
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}
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/*
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* Unlock and decrement the reference count of an inode structure.
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*/
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int
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iso_iput(ip)
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register struct iso_node *ip;
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{
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if ((ip->i_flag & ILOCKED) == 0)
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panic("iso_iput");
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ISO_IUNLOCK(ip);
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vrele(ITOV(ip));
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return (0);
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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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remque(ip);
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ip->i_forw = ip;
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ip->i_back = 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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* Lock an inode. If its already locked, set the WANT bit and sleep.
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*/
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int
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iso_ilock(ip)
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register struct iso_node *ip;
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{
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while (ip->i_flag & ILOCKED) {
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ip->i_flag |= IWANT;
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if (ip->i_spare0 == curproc->p_pid)
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panic("locking against myself");
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ip->i_spare1 = curproc->p_pid;
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(void) tsleep((caddr_t)ip, PINOD, "isoilk", 0);
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}
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ip->i_spare1 = 0;
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ip->i_spare0 = curproc->p_pid;
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ip->i_flag |= ILOCKED;
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return (0);
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}
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/*
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* Unlock an inode. If WANT bit is on, wakeup.
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*/
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int
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iso_iunlock(ip)
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register struct iso_node *ip;
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{
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if ((ip->i_flag & ILOCKED) == 0)
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vprint("iso_iunlock: unlocked inode", ITOV(ip));
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ip->i_spare0 = 0;
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ip->i_flag &= ~ILOCKED;
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if (ip->i_flag&IWANT) {
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ip->i_flag &= ~IWANT;
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wakeup((caddr_t)ip);
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}
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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,ftype)
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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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enum ISO_FTYPE ftype;
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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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/* high sierra does not have timezone data, flag is one byte ahead */
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if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA?
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&isodir->date[6]: 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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iso_blkatoff(inop,-off * imp->logical_block_size,&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_un.b_addr;
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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;
|
|
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 |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6;
|
|
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))) {
|
|
iso_blkatoff(inop,-off * imp->logical_block_size,&bp2);
|
|
bp = bp2;
|
|
}
|
|
if (bp) {
|
|
ap = (struct iso_extended_attributes *)bp->b_un.b_addr;
|
|
|
|
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)
|
|
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 = pi[6];
|
|
else
|
|
/* original high sierra misses timezone data */
|
|
tz = 0;
|
|
|
|
if (y < 1970) {
|
|
pu->ts_sec = 0;
|
|
pu->ts_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->ts_sec = crtime;
|
|
pu->ts_nsec = 0;
|
|
return 1;
|
|
}
|
|
|
|
static unsigned
|
|
cd9660_chars2ui(begin,len)
|
|
unsigned char *begin;
|
|
int len;
|
|
{
|
|
unsigned rc;
|
|
|
|
for (rc = 0; --len >= 0;) {
|
|
rc *= 10;
|
|
rc += *begin++ - '0';
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
int
|
|
cd9660_tstamp_conv17(pi,pu)
|
|
unsigned char *pi;
|
|
struct timespec *pu;
|
|
{
|
|
unsigned 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);
|
|
}
|
|
|
|
void
|
|
isodirino(inump,isodir,imp)
|
|
ino_t *inump;
|
|
struct iso_directory_record *isodir;
|
|
struct iso_mnt *imp;
|
|
{
|
|
*inump = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length))
|
|
* imp->logical_block_size;
|
|
}
|