/* $OpenBSD: cd9660_node.c,v 1.31 2016/06/19 11:54:33 natano Exp $ */ /* $NetBSD: cd9660_node.c,v 1.17 1997/05/05 07:13:57 mycroft Exp $ */ /*- * 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. 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 8.5 (Berkeley) 12/5/94 */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include /* * Structures associated with iso_node caching. */ u_int cd9660_isohash(dev_t, cdino_t); struct iso_node **isohashtbl; u_long isohash; SIPHASH_KEY isohashkey; #define INOHASH(device, inum) cd9660_isohash((device), (inum)) extern int prtactive; /* 1 => print out reclaim of active vnodes */ static u_int cd9660_chars2ui(u_char *, int); /* * Initialize hash links for inodes and dnodes. */ int cd9660_init(vfsp) struct vfsconf *vfsp; { isohashtbl = hashinit(initialvnodes, M_ISOFSMNT, M_WAITOK, &isohash); arc4random_buf(&isohashkey, sizeof(isohashkey)); return (0); } u_int cd9660_isohash(dev_t device, cdino_t inum) { SIPHASH_CTX ctx; SipHash24_Init(&ctx, &isohashkey); SipHash24_Update(&ctx, &device, sizeof(device)); SipHash24_Update(&ctx, &inum, sizeof(inum)); return (SipHash24_End(&ctx) & isohash); } /* * Use the device/inum pair to find the incore inode, and return a pointer * to it. If it is in core, but locked, wait for it. */ struct vnode * cd9660_ihashget(dev, inum) dev_t dev; cdino_t inum; { struct proc *p = curproc; /* XXX */ struct iso_node *ip; struct vnode *vp; loop: /* XXX locking lock hash list? */ for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { if (inum == ip->i_number && dev == ip->i_dev) { vp = ITOV(ip); /* XXX locking unlock hash list? */ if (vget(vp, LK_EXCLUSIVE, p)) goto loop; return (vp); } } /* XXX locking unlock hash list? */ return (NULL); } /* * Insert the inode into the hash table, and return it locked. */ int cd9660_ihashins(ip) struct iso_node *ip; { struct iso_node **ipp, *iq; /* XXX locking lock hash list? */ ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; for (iq = *ipp; iq; iq = iq->i_next) { if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) return (EEXIST); } if ((iq = *ipp) != NULL) iq->i_prev = &ip->i_next; ip->i_next = iq; ip->i_prev = ipp; *ipp = ip; /* XXX locking unlock hash list? */ rrw_enter(&ip->i_lock, RW_WRITE); return (0); } /* * Remove the inode from the hash table. */ void cd9660_ihashrem(ip) register struct iso_node *ip; { register struct iso_node *iq; if (ip->i_prev == NULL) return; /* XXX locking lock hash list? */ if ((iq = ip->i_next) != NULL) iq->i_prev = ip->i_prev; *ip->i_prev = iq; #ifdef DIAGNOSTIC ip->i_next = NULL; ip->i_prev = NULL; #endif /* XXX locking unlock hash list? */ } /* * Last reference to an inode, write the inode out and if necessary, * truncate and deallocate the file. */ int cd9660_inactive(v) void *v; { struct vop_inactive_args *ap = v; struct vnode *vp = ap->a_vp; struct proc *p = ap->a_p; register struct iso_node *ip = VTOI(vp); int error = 0; #ifdef DIAGNOSTIC if (prtactive && vp->v_usecount != 0) vprint("cd9660_inactive: pushing active", vp); #endif ip->i_flag = 0; VOP_UNLOCK(vp, p); /* * If we are done with the inode, reclaim it * so that it can be reused immediately. */ if (ip->inode.iso_mode == 0) vrecycle(vp, p); return (error); } /* * Reclaim an inode so that it can be used for other purposes. */ int cd9660_reclaim(v) void *v; { struct vop_reclaim_args *ap = v; register struct vnode *vp = ap->a_vp; register struct iso_node *ip = VTOI(vp); #ifdef DIAGNOSTIC if (prtactive && vp->v_usecount != 0) vprint("cd9660_reclaim: pushing active", vp); #endif /* * Remove the inode from its hash chain. */ cd9660_ihashrem(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, 0); vp->v_data = NULL; 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))) { cd9660_bufatoff(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[1]&0x10)) inop->inode.iso_mode |= S_IRUSR; if (!(ap->perm[1]&0x40)) inop->inode.iso_mode |= S_IXUSR; if (!(ap->perm[0]&0x01)) inop->inode.iso_mode |= S_IRGRP; if (!(ap->perm[0]&0x04)) inop->inode.iso_mode |= S_IXGRP; if (!(ap->perm[0]&0x10)) inop->inode.iso_mode |= S_IROTH; if (!(ap->perm[0]&0x40)) inop->inode.iso_mode |= S_IXOTH; 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) 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))) { cd9660_bufatoff(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 (!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) u_char *pi; struct timespec *pu; { int crtime, days; int y, m, d, hour, minute, second; signed char tz; y = pi[0] + 1900; m = pi[1]; d = pi[2]; hour = pi[3]; minute = pi[4]; second = pi[5]; tz = (signed char) pi[6]; 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)); } cdino_t isodirino(isodir, imp) struct iso_directory_record *isodir; struct iso_mnt *imp; { cdino_t ino; ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) << imp->im_bshift; return (ino); }