/*- * Copyright (c) 1982, 1986, 1989, 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. 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 * $Id: cd9660_node.c,v 1.5 1994/09/22 19:37:43 wollman Exp $ */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define INOHSZ 512 #if ((INOHSZ&(INOHSZ-1)) == 0) #define INOHASH(dev,ino) (((dev)+((ino)>>12))&(INOHSZ-1)) #else #define INOHASH(dev,ino) (((unsigned)((dev)+((ino)>>12)))%INOHSZ) #endif union iso_ihead { union iso_ihead *ih_head[2]; struct iso_node *ih_chain[2]; } iso_ihead[INOHSZ]; #ifdef ISODEVMAP #define DNOHSZ 64 #if ((DNOHSZ&(DNOHSZ-1)) == 0) #define DNOHASH(dev,ino) (((dev)+((ino)>>12))&(DNOHSZ-1)) #else #define DNOHASH(dev,ino) (((unsigned)((dev)+((ino)>>12)))%DNOHSZ) #endif union iso_dhead { union iso_dhead *dh_head[2]; struct iso_dnode *dh_chain[2]; } iso_dhead[DNOHSZ]; #endif int prtactive; /* 1 => print out reclaim of active vnodes */ /* * Initialize hash links for inodes and dnodes. */ int cd9660_init() { register int i; register union iso_ihead *ih = iso_ihead; #ifdef ISODEVMAP register union iso_dhead *dh = iso_dhead; #endif for (i = INOHSZ; --i >= 0; ih++) { ih->ih_head[0] = ih; ih->ih_head[1] = ih; } #ifdef ISODEVMAP for (i = DNOHSZ; --i >= 0; dh++) { dh->dh_head[0] = dh; dh->dh_head[1] = dh; } #endif return (0); } #ifdef ISODEVMAP /* * Enter a new node into the device hash list */ struct iso_dnode * iso_dmap(dev,ino,create) dev_t dev; ino_t ino; int create; { struct iso_dnode *dp; union iso_dhead *dh; dh = &iso_dhead[DNOHASH(dev, ino)]; for (dp = dh->dh_chain[0]; dp != (struct iso_dnode *)dh; dp = dp->d_forw) if (ino == dp->i_number && dev == dp->i_dev) return dp; if (!create) return (struct iso_dnode *)0; MALLOC(dp,struct iso_dnode *,sizeof(struct iso_dnode),M_CACHE,M_WAITOK); dp->i_dev = dev; dp->i_number = ino; insque(dp,dh); return dp; } void iso_dunmap(dev) dev_t dev; { struct iso_dnode *dp, *dq; union iso_dhead *dh; for (dh = iso_dhead; dh < iso_dhead + DNOHSZ; dh++) { for (dp = dh->dh_chain[0]; dp != (struct iso_dnode *)dh; dp = dq) { dq = dp->d_forw; if (dev == dp->i_dev) { remque(dp); FREE(dp,M_CACHE); } } } } #endif /* * Look up a ISOFS dinode number to find its incore vnode. * If it is not in core, read it in from the specified device. * If it is in core, wait for the lock bit to clear, then * return the inode locked. Detection and handling of mount * points must be done by the calling routine. */ int iso_iget(xp, ino, relocated, ipp, isodir) struct iso_node *xp; ino_t ino; int relocated; struct iso_node **ipp; struct iso_directory_record *isodir; { dev_t dev = xp->i_dev; struct mount *mntp = ITOV(xp)->v_mount; register struct iso_node *ip, *iq; register struct vnode *vp; #ifdef ISODEVMAP register struct iso_dnode *dp; #endif struct vnode *nvp; struct buf *bp = NULL, *bp2 = NULL; union iso_ihead *ih; int error, result; struct iso_mnt *imp; ih = &iso_ihead[INOHASH(dev, ino)]; loop: for (ip = ih->ih_chain[0]; ip != (struct iso_node *)ih; ip = ip->i_forw) { if (ino != ip->i_number || dev != ip->i_dev) continue; if ((ip->i_flag&ILOCKED) != 0) { ip->i_flag |= IWANT; sleep((caddr_t)ip, PINOD); goto loop; } if (vget(ITOV(ip), 1)) goto loop; *ipp = ip; return 0; } /* * Allocate a new vnode/iso_node. */ if ((error = getnewvnode(VT_ISOFS, mntp, cd9660_vnodeop_p, &nvp))) { *ipp = 0; return error; } MALLOC(ip, struct iso_node *, sizeof(struct iso_node), M_ISOFSNODE, M_WAITOK); bzero((caddr_t)ip, sizeof(struct iso_node)); nvp->v_data = ip; ip->i_vnode = nvp; ip->i_flag = 0; ip->i_devvp = 0; ip->i_diroff = 0; ip->i_lockf = 0; /* * Put it onto its hash chain and lock it so that other requests for * this inode will block if they arrive while we are sleeping waiting * for old data structures to be purged or for the contents of the * disk portion of this inode to be read. */ ip->i_dev = dev; ip->i_number = ino; insque(ip, ih); ISO_ILOCK(ip); imp = VFSTOISOFS (mntp); ip->i_mnt = imp; ip->i_devvp = imp->im_devvp; VREF(ip->i_devvp); if (relocated) { /* * On relocated directories we must * read the `.' entry out of a dir. */ ip->iso_start = ino >> imp->im_bshift; if ((error = iso_blkatoff(ip,0,&bp))) { vrele(ip->i_devvp); remque(ip); ip->i_forw = ip; ip->i_back = ip; iso_iput(ip); *ipp = 0; return error; } isodir = (struct iso_directory_record *)bp->b_un.b_addr; } ip->iso_extent = isonum_733(isodir->extent); ip->i_size = isonum_733(isodir->size); ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; vp = ITOV(ip); /* * Setup time stamp, attribute */ vp->v_type = VNON; switch (imp->iso_ftype) { default: /* ISO_FTYPE_9660 */ if ((imp->im_flags&ISOFSMNT_EXTATT) && isonum_711(isodir->ext_attr_length)) iso_blkatoff(ip,-isonum_711(isodir->ext_attr_length), &bp2); cd9660_defattr(isodir,ip,bp2 ); cd9660_deftstamp(isodir,ip,bp2 ); break; case ISO_FTYPE_RRIP: result = cd9660_rrip_analyze(isodir,ip,imp); break; } if (bp2) brelse(bp2); if (bp) brelse(bp); /* * Initialize the associated vnode */ vp->v_type = IFTOVT(ip->inode.iso_mode); if ( vp->v_type == VFIFO ) { extern int (**cd9660_fifoop_p)(); vp->v_op = cd9660_fifoop_p; } else if ( vp->v_type == VCHR || vp->v_type == VBLK ) { extern int (**cd9660_specop_p)(); /* * if device, look at device number table for translation */ #ifdef ISODEVMAP if (dp = iso_dmap(dev,ino,0)) ip->inode.iso_rdev = dp->d_dev; #endif vp->v_op = cd9660_specop_p; if ((nvp = checkalias(vp, ip->inode.iso_rdev, mntp))) { /* * Reinitialize aliased inode. */ vp = nvp; iq = VTOI(vp); iq->i_vnode = vp; iq->i_flag = 0; ISO_ILOCK(iq); iq->i_dev = dev; iq->i_number = ino; iq->i_mnt = ip->i_mnt; bcopy(&ip->iso_extent,&iq->iso_extent, (char *)(ip + 1) - (char *)&ip->iso_extent); insque(iq, ih); /* * Discard unneeded vnode * (This introduces the need of INACTIVE modification) */ ip->inode.iso_mode = 0; iso_iput(ip); ip = iq; } } if (ip->iso_extent == imp->root_extent) vp->v_flag |= VROOT; *ipp = ip; return 0; } /* * Unlock and decrement the reference count of an inode structure. */ int iso_iput(ip) register struct iso_node *ip; { if ((ip->i_flag & ILOCKED) == 0) panic("iso_iput"); ISO_IUNLOCK(ip); vrele(ITOV(ip)); return (0); } /* * 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; } */ *ap; { struct vnode *vp = ap->a_vp; register struct iso_node *ip = VTOI(vp); int error = 0; if (prtactive && vp->v_usecount != 0) vprint("cd9660_inactive: pushing active", vp); ip->i_flag = 0; /* * If we are done with the inode, reclaim it * so that it can be reused immediately. */ if (vp->v_usecount == 0 && ip->inode.iso_mode == 0) vgone(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; } */ *ap; { register struct vnode *vp = ap->a_vp; register struct iso_node *ip = VTOI(vp); if (prtactive && vp->v_usecount != 0) vprint("cd9660_reclaim: pushing active", vp); /* * Remove the inode from its hash chain. */ remque(ip); ip->i_forw = ip; ip->i_back = ip; /* * Purge old data structures associated with the inode. */ cache_purge(vp); if (ip->i_devvp) { vrele(ip->i_devvp); ip->i_devvp = 0; } FREE(vp->v_data, M_ISOFSNODE); vp->v_data = NULL; return 0; } /* * Lock an inode. If its already locked, set the WANT bit and sleep. */ int iso_ilock(ip) register struct iso_node *ip; { while (ip->i_flag & ILOCKED) { ip->i_flag |= IWANT; if (ip->i_spare0 == curproc->p_pid) panic("locking against myself"); ip->i_spare1 = curproc->p_pid; (void) sleep((caddr_t)ip, PINOD); } ip->i_spare1 = 0; ip->i_spare0 = curproc->p_pid; ip->i_flag |= ILOCKED; return (0); } /* * Unlock an inode. If WANT bit is on, wakeup. */ int iso_iunlock(ip) register struct iso_node *ip; { if ((ip->i_flag & ILOCKED) == 0) vprint("iso_iunlock: unlocked inode", ITOV(ip)); ip->i_spare0 = 0; ip->i_flag &= ~ILOCKED; if (ip->i_flag&IWANT) { ip->i_flag &= ~IWANT; wakeup((caddr_t)ip); } return (0); } /* * File attributes */ void cd9660_defattr(isodir,inop,bp) struct iso_directory_record *isodir; struct iso_node *inop; struct buf *bp; { struct buf *bp2 = NULL; struct iso_mnt *imp; struct iso_extended_attributes *ap = NULL; int off; if (isonum_711(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))) { iso_blkatoff(inop,-off * imp->logical_block_size,&bp2); bp = bp2; } if (bp) { ap = (struct iso_extended_attributes *)bp->b_un.b_addr; if (isonum_711(ap->version) == 1) { if (!(ap->perm[0]&0x40)) inop->inode.iso_mode |= VEXEC >> 6; if (!(ap->perm[0]&0x10)) inop->inode.iso_mode |= VREAD >> 6; if (!(ap->perm[0]&4)) inop->inode.iso_mode |= VEXEC >> 3; if (!(ap->perm[0]&1)) inop->inode.iso_mode |= VREAD >> 3; if (!(ap->perm[1]&0x40)) inop->inode.iso_mode |= VEXEC; if (!(ap->perm[1]&0x10)) 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) struct iso_directory_record *isodir; struct iso_node *inop; struct buf *bp; { 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 (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); 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) char *pi; struct timespec *pu; { 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]; tz = pi[6]; 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); } 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; }