cd9660_node.c revision 166639
1/*- 2 * Copyright (c) 1982, 1986, 1989, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley 6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 7 * Support code is derived from software contributed to Berkeley 8 * by Atsushi Murai (amurai@spec.co.jp). 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94 35 */ 36 37#include <sys/cdefs.h> 38__FBSDID("$FreeBSD: head/sys/fs/cd9660/cd9660_node.c 166639 2007-02-11 13:54:25Z rodrigc $"); 39 40#include <sys/param.h> 41#include <sys/systm.h> 42#include <sys/mount.h> 43#include <sys/bio.h> 44#include <sys/buf.h> 45#include <sys/vnode.h> 46#include <sys/malloc.h> 47#include <sys/stat.h> 48#include <sys/mutex.h> 49 50#include <fs/cd9660/iso.h> 51#include <fs/cd9660/cd9660_node.h> 52#include <fs/cd9660/cd9660_mount.h> 53 54static unsigned cd9660_chars2ui(unsigned char *begin, int len); 55 56/* 57 * Last reference to an inode, write the inode out and if necessary, 58 * truncate and deallocate the file. 59 */ 60int 61cd9660_inactive(ap) 62 struct vop_inactive_args /* { 63 struct vnode *a_vp; 64 struct thread *a_td; 65 } */ *ap; 66{ 67 struct vnode *vp = ap->a_vp; 68 struct thread *td = ap->a_td; 69 struct iso_node *ip = VTOI(vp); 70 int error = 0; 71 72 if (prtactive && vrefcnt(vp) != 0) 73 vprint("cd9660_inactive: pushing active", vp); 74 75 ip->i_flag = 0; 76 /* 77 * If we are done with the inode, reclaim it 78 * so that it can be reused immediately. 79 */ 80 if (ip->inode.iso_mode == 0) 81 vrecycle(vp, td); 82 return error; 83} 84 85/* 86 * Reclaim an inode so that it can be used for other purposes. 87 */ 88int 89cd9660_reclaim(ap) 90 struct vop_reclaim_args /* { 91 struct vnode *a_vp; 92 struct thread *a_td; 93 } */ *ap; 94{ 95 struct vnode *vp = ap->a_vp; 96 struct iso_node *ip = VTOI(vp); 97 98 if (prtactive && vrefcnt(vp) != 0) 99 vprint("cd9660_reclaim: pushing active", vp); 100 /* 101 * Destroy the vm object and flush associated pages. 102 */ 103 vnode_destroy_vobject(vp); 104 /* 105 * Remove the inode from its hash chain. 106 */ 107 vfs_hash_remove(vp); 108 109 /* 110 * Purge old data structures associated with the inode. 111 */ 112 if (ip->i_mnt->im_devvp) 113 vrele(ip->i_mnt->im_devvp); 114 FREE(vp->v_data, M_ISOFSNODE); 115 vp->v_data = NULL; 116 return (0); 117} 118 119/* 120 * File attributes 121 */ 122void 123cd9660_defattr(isodir, inop, bp, ftype) 124 struct iso_directory_record *isodir; 125 struct iso_node *inop; 126 struct buf *bp; 127 enum ISO_FTYPE ftype; 128{ 129 struct buf *bp2 = NULL; 130 struct iso_mnt *imp; 131 struct iso_extended_attributes *ap = NULL; 132 int off; 133 134 /* high sierra does not have timezone data, flag is one byte ahead */ 135 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 136 &isodir->date[6]: isodir->flags)&2) { 137 inop->inode.iso_mode = S_IFDIR; 138 /* 139 * If we return 2, fts() will assume there are no subdirectories 140 * (just links for the path and .), so instead we return 1. 141 */ 142 inop->inode.iso_links = 1; 143 } else { 144 inop->inode.iso_mode = S_IFREG; 145 inop->inode.iso_links = 1; 146 } 147 if (!bp 148 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 149 && (off = isonum_711(isodir->ext_attr_length))) { 150 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 151 &bp2); 152 bp = bp2; 153 } 154 if (bp) { 155 ap = (struct iso_extended_attributes *)bp->b_data; 156 157 if (isonum_711(ap->version) == 1) { 158 if (!(ap->perm[0]&0x40)) 159 inop->inode.iso_mode |= VEXEC >> 6; 160 if (!(ap->perm[0]&0x10)) 161 inop->inode.iso_mode |= VREAD >> 6; 162 if (!(ap->perm[0]&4)) 163 inop->inode.iso_mode |= VEXEC >> 3; 164 if (!(ap->perm[0]&1)) 165 inop->inode.iso_mode |= VREAD >> 3; 166 if (!(ap->perm[1]&0x40)) 167 inop->inode.iso_mode |= VEXEC; 168 if (!(ap->perm[1]&0x10)) 169 inop->inode.iso_mode |= VREAD; 170 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 171 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 172 } else 173 ap = NULL; 174 } 175 if (!ap) { 176 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 177 inop->inode.iso_uid = (uid_t)0; 178 inop->inode.iso_gid = (gid_t)0; 179 } 180 if (bp2) 181 brelse(bp2); 182} 183 184/* 185 * Time stamps 186 */ 187void 188cd9660_deftstamp(isodir,inop,bp,ftype) 189 struct iso_directory_record *isodir; 190 struct iso_node *inop; 191 struct buf *bp; 192 enum ISO_FTYPE ftype; 193{ 194 struct buf *bp2 = NULL; 195 struct iso_mnt *imp; 196 struct iso_extended_attributes *ap = NULL; 197 int off; 198 199 if (!bp 200 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 201 && (off = isonum_711(isodir->ext_attr_length))) { 202 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 203 &bp2); 204 bp = bp2; 205 } 206 if (bp) { 207 ap = (struct iso_extended_attributes *)bp->b_data; 208 209 if (ftype != ISO_FTYPE_HIGH_SIERRA 210 && isonum_711(ap->version) == 1) { 211 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 212 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 213 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 214 inop->inode.iso_ctime = inop->inode.iso_atime; 215 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 216 inop->inode.iso_mtime = inop->inode.iso_ctime; 217 } else 218 ap = NULL; 219 } 220 if (!ap) { 221 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 222 inop->inode.iso_atime = inop->inode.iso_ctime; 223 inop->inode.iso_mtime = inop->inode.iso_ctime; 224 } 225 if (bp2) 226 brelse(bp2); 227} 228 229int 230cd9660_tstamp_conv7(pi,pu,ftype) 231 u_char *pi; 232 struct timespec *pu; 233 enum ISO_FTYPE ftype; 234{ 235 int crtime, days; 236 int y, m, d, hour, minute, second, tz; 237 238 y = pi[0] + 1900; 239 m = pi[1]; 240 d = pi[2]; 241 hour = pi[3]; 242 minute = pi[4]; 243 second = pi[5]; 244 if(ftype != ISO_FTYPE_HIGH_SIERRA) 245 tz = pi[6]; 246 else 247 /* original high sierra misses timezone data */ 248 tz = 0; 249 250 if (y < 1970) { 251 pu->tv_sec = 0; 252 pu->tv_nsec = 0; 253 return 0; 254 } else { 255#ifdef ORIGINAL 256 /* computes day number relative to Sept. 19th,1989 */ 257 /* don't even *THINK* about changing formula. It works! */ 258 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 259#else 260 /* 261 * Changed :-) to make it relative to Jan. 1st, 1970 262 * and to disambiguate negative division 263 */ 264 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 265#endif 266 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 267 268 /* timezone offset is unreliable on some disks */ 269 if (-48 <= tz && tz <= 52) 270 crtime -= tz * 15 * 60; 271 } 272 pu->tv_sec = crtime; 273 pu->tv_nsec = 0; 274 return 1; 275} 276 277static u_int 278cd9660_chars2ui(begin,len) 279 u_char *begin; 280 int len; 281{ 282 u_int rc; 283 284 for (rc = 0; --len >= 0;) { 285 rc *= 10; 286 rc += *begin++ - '0'; 287 } 288 return rc; 289} 290 291int 292cd9660_tstamp_conv17(pi,pu) 293 u_char *pi; 294 struct timespec *pu; 295{ 296 u_char buf[7]; 297 298 /* year:"0001"-"9999" -> -1900 */ 299 buf[0] = cd9660_chars2ui(pi,4) - 1900; 300 301 /* month: " 1"-"12" -> 1 - 12 */ 302 buf[1] = cd9660_chars2ui(pi + 4,2); 303 304 /* day: " 1"-"31" -> 1 - 31 */ 305 buf[2] = cd9660_chars2ui(pi + 6,2); 306 307 /* hour: " 0"-"23" -> 0 - 23 */ 308 buf[3] = cd9660_chars2ui(pi + 8,2); 309 310 /* minute:" 0"-"59" -> 0 - 59 */ 311 buf[4] = cd9660_chars2ui(pi + 10,2); 312 313 /* second:" 0"-"59" -> 0 - 59 */ 314 buf[5] = cd9660_chars2ui(pi + 12,2); 315 316 /* difference of GMT */ 317 buf[6] = pi[16]; 318 319 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 320} 321 322ino_t 323isodirino(isodir, imp) 324 struct iso_directory_record *isodir; 325 struct iso_mnt *imp; 326{ 327 ino_t ino; 328 329 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 330 << imp->im_bshift; 331 return (ino); 332} 333