/*- * Copyright (c) 1982, 1986, 1989, 1994, 1995 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension * Support code is derived from software contributed to Berkeley * by Atsushi Murai (amurai@spec.co.jp). * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. 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 * $FreeBSD: src/sys/isofs/cd9660/cd9660_node.c,v 1.29.2.1 2000/07/08 14:35:56 bp Exp $ * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.20 2006/09/10 01:26:40 dillon Exp $ */ #include #include #include #include #include #include #include #include #include "iso.h" #include "cd9660_node.h" #include "cd9660_mount.h" #define CD9660_HASH_SIZE_LIMIT 8192 /* * Structures associated with iso_node caching. */ static struct iso_node **isohashtbl; static u_long isohash; #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash) #ifndef NULL_SIMPLELOCKS static struct lwkt_token cd9660_ihash_token; #endif static void cd9660_ihashrem (struct iso_node *); static unsigned cd9660_chars2ui (unsigned char *begin, int len); /* * Initialize hash links for inodes and dnodes. CDs and DVDs are small * and slow compared to hard disks, there is no need to have a huge hash * table so the size is capped at CD9660_HASH_SIZE_LIMIT. */ int cd9660_init(struct vfsconf *vfsp) { int hlimit; if ((hlimit = desiredvnodes) < CD9660_HASH_SIZE_LIMIT) hlimit = CD9660_HASH_SIZE_LIMIT; isohash = 16; while (isohash < hlimit) isohash <<= 1; isohashtbl = kmalloc(sizeof(void *) * isohash, M_ISOFSMNT, M_WAITOK|M_ZERO); --isohash; lwkt_token_init(&cd9660_ihash_token); return (0); } int cd9660_uninit(struct vfsconf *vfsp) { if (isohashtbl != NULL) kfree(isohashtbl, M_ISOFSMNT); return (0); } /* * 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(cdev_t dev, ino_t inum) { struct iso_node *ip; lwkt_tokref ilock; struct vnode *vp; lwkt_gettoken(&ilock, &cd9660_ihash_token); loop: for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { if (inum != ip->i_number || dev != ip->i_dev) continue; vp = ITOV(ip); if (vget(vp, LK_EXCLUSIVE)) goto loop; /* * We must check to see if the inode has been ripped * out from under us after blocking. */ for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { if (inum == ip->i_number && dev == ip->i_dev) break; } if (ip == NULL || ITOV(ip) != vp) { goto loop; } lwkt_reltoken(&ilock); return (vp); } lwkt_reltoken(&ilock); return (NULL); } /* * Insert the inode into the hash table, return 0 on success, non-zero * if the inode has already been found to be in the hash table. */ int cd9660_ihashins(struct iso_node *ip) { struct iso_node **ipp, *iq; lwkt_tokref ilock; lwkt_gettoken(&ilock, &cd9660_ihash_token); ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; while ((iq = *ipp) != NULL) { if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) { lwkt_reltoken(&ilock); return(EBUSY); } ipp = &iq->i_next; } ip->i_next = NULL; *ipp = ip; lwkt_reltoken(&ilock); return(0); } /* * Remove the inode from the hash table. */ static void cd9660_ihashrem(struct iso_node *ip) { struct iso_node **ipp, *iq; lwkt_tokref ilock; lwkt_gettoken(&ilock, &cd9660_ihash_token); ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; while ((iq = *ipp) != NULL) { if (ip == iq) break; ipp = &iq->i_next; } KKASSERT(ip == iq); *ipp = ip->i_next; ip->i_next = NULL; lwkt_reltoken(&ilock); } /* * Last reference to an inode, write the inode out and if necessary, * truncate and deallocate the file. * * cd9660_inactive(struct vnode *a_vp) */ int cd9660_inactive(struct vop_inactive_args *ap) { struct vnode *vp = ap->a_vp; struct iso_node *ip = VTOI(vp); int error = 0; if (prtactive && vp->v_usecount != 0) vprint("cd9660_inactive: pushing active", vp); if (ip) ip->i_flag = 0; /* * If we are done with the inode, reclaim it * so that it can be reused immediately. */ if (ip == NULL || ip->inode.iso_mode == 0) vrecycle(vp); return error; } /* * Reclaim an inode so that it can be used for other purposes. * * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p) */ int cd9660_reclaim(struct vop_reclaim_args *ap) { struct vnode *vp = ap->a_vp; 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. */ vp->v_data = NULL; if (ip) { cd9660_ihashrem(ip); if (ip->i_devvp) { vrele(ip->i_devvp); ip->i_devvp = 0; } kfree(ip, M_ISOFSNODE); } return (0); } /* * File attributes */ void cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, struct buf *bp, enum ISO_FTYPE ftype) { struct buf *bp2 = NULL; struct iso_mnt *imp; struct iso_extended_attributes *ap = NULL; int off; /* high sierra does not have timezone data, flag is one byte ahead */ if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? &isodir->date[6]: isodir->flags)&2) { inop->inode.iso_mode = S_IFDIR; /* * If we return 2, fts() will assume there are no subdirectories * (just links for the path and .), so instead we return 1. */ inop->inode.iso_links = 1; } else { inop->inode.iso_mode = S_IFREG; inop->inode.iso_links = 1; } if (!bp && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) && (off = isonum_711(isodir->ext_attr_length))) { cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, &bp2); bp = bp2; } if (bp) { ap = (struct iso_extended_attributes *)bp->b_data; if (isonum_711(ap->version) == 1) { if (!(ap->perm[0]&0x40)) inop->inode.iso_mode |= 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(struct iso_directory_record *isodir, struct iso_node *inop, struct buf *bp, enum ISO_FTYPE ftype) { struct buf *bp2 = NULL; struct iso_mnt *imp; struct iso_extended_attributes *ap = NULL; int off; if (!bp && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) && (off = isonum_711(isodir->ext_attr_length))) { cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, &bp2); bp = bp2; } if (bp) { ap = (struct iso_extended_attributes *)bp->b_data; if (ftype != ISO_FTYPE_HIGH_SIERRA && isonum_711(ap->version) == 1) { if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) inop->inode.iso_ctime = inop->inode.iso_atime; if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) inop->inode.iso_mtime = inop->inode.iso_ctime; } else ap = NULL; } if (!ap) { cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); inop->inode.iso_atime = inop->inode.iso_ctime; inop->inode.iso_mtime = inop->inode.iso_ctime; } if (bp2) brelse(bp2); } int cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) { int crtime, days; int y, m, d, hour, minute, second, tz; y = pi[0] + 1900; m = pi[1]; d = pi[2]; hour = pi[3]; minute = pi[4]; second = pi[5]; if(ftype != ISO_FTYPE_HIGH_SIERRA) tz = pi[6]; else /* original high sierra misses timezone data */ tz = 0; if (y < 1970) { pu->tv_sec = 0; pu->tv_nsec = 0; return 0; } else { #ifdef ORIGINAL /* computes day number relative to Sept. 19th,1989 */ /* don't even *THINK* about changing formula. It works! */ days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; #else /* * Changed :-) to make it relative to Jan. 1st, 1970 * and to disambiguate negative division */ days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; #endif crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; /* timezone offset is unreliable on some disks */ if (-48 <= tz && tz <= 52) crtime -= tz * 15 * 60; } pu->tv_sec = crtime; pu->tv_nsec = 0; return 1; } static u_int cd9660_chars2ui(u_char *begin, int len) { u_int rc; for (rc = 0; --len >= 0;) { rc *= 10; rc += *begin++ - '0'; } return rc; } int cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) { u_char buf[7]; /* year:"0001"-"9999" -> -1900 */ buf[0] = cd9660_chars2ui(pi,4) - 1900; /* month: " 1"-"12" -> 1 - 12 */ buf[1] = cd9660_chars2ui(pi + 4,2); /* day: " 1"-"31" -> 1 - 31 */ buf[2] = cd9660_chars2ui(pi + 6,2); /* hour: " 0"-"23" -> 0 - 23 */ buf[3] = cd9660_chars2ui(pi + 8,2); /* minute:" 0"-"59" -> 0 - 59 */ buf[4] = cd9660_chars2ui(pi + 10,2); /* second:" 0"-"59" -> 0 - 59 */ buf[5] = cd9660_chars2ui(pi + 12,2); /* difference of GMT */ buf[6] = pi[16]; return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); } ino_t isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) { ino_t ino; ino = (ino_t)(isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) << imp->im_bshift; return (ino); }