1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1982, 1986, 1989, 1994, 1995 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley 8 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai@spec.co.jp). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94 37 */ 38 39 #include <sys/cdefs.h> 40 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mount.h> 45 #include <sys/bio.h> 46 #include <sys/buf.h> 47 #include <sys/vnode.h> 48 #include <sys/malloc.h> 49 #include <sys/stat.h> 50 #include <sys/mutex.h> 51 52 #include <fs/cd9660/iso.h> 53 #include <fs/cd9660/cd9660_node.h> 54 #include <fs/cd9660/cd9660_mount.h> 55 56 static unsigned cd9660_chars2ui(unsigned char *begin, int len); 57 58 /* 59 * Last reference to an inode, write the inode out and if necessary, 60 * truncate and deallocate the file. 61 */ 62 int 63 cd9660_inactive(ap) 64 struct vop_inactive_args /* { 65 struct vnode *a_vp; 66 struct thread *a_td; 67 } */ *ap; 68 { 69 struct vnode *vp = ap->a_vp; 70 struct iso_node *ip = VTOI(vp); 71 int error = 0; 72 73 /* 74 * If we are done with the inode, reclaim it 75 * so that it can be reused immediately. 76 */ 77 if (ip->inode.iso_mode == 0) 78 vrecycle(vp); 79 return error; 80 } 81 82 /* 83 * Reclaim an inode so that it can be used for other purposes. 84 */ 85 int 86 cd9660_reclaim(ap) 87 struct vop_reclaim_args /* { 88 struct vnode *a_vp; 89 } */ *ap; 90 { 91 struct vnode *vp = ap->a_vp; 92 93 /* 94 * Remove the inode from its hash chain. 95 */ 96 vfs_hash_remove(vp); 97 98 /* 99 * Purge old data structures associated with the inode. 100 */ 101 free(vp->v_data, M_ISOFSNODE); 102 vp->v_data = NULL; 103 return (0); 104 } 105 106 /* 107 * File attributes 108 */ 109 void 110 cd9660_defattr(isodir, inop, bp, ftype) 111 struct iso_directory_record *isodir; 112 struct iso_node *inop; 113 struct buf *bp; 114 enum ISO_FTYPE ftype; 115 { 116 struct buf *bp2 = NULL; 117 struct iso_mnt *imp; 118 struct iso_extended_attributes *ap = NULL; 119 int off; 120 121 /* high sierra does not have timezone data, flag is one byte ahead */ 122 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 123 &isodir->date[6]: isodir->flags)&2) { 124 inop->inode.iso_mode = S_IFDIR; 125 /* 126 * If we return 2, fts() will assume there are no subdirectories 127 * (just links for the path and .), so instead we return 1. 128 */ 129 inop->inode.iso_links = 1; 130 } else { 131 inop->inode.iso_mode = S_IFREG; 132 inop->inode.iso_links = 1; 133 } 134 if (!bp 135 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 136 && (off = isonum_711(isodir->ext_attr_length))) { 137 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 138 &bp2); 139 bp = bp2; 140 } 141 if (bp) { 142 ap = (struct iso_extended_attributes *)bp->b_data; 143 144 if (isonum_711(ap->version) == 1) { 145 if (!(ap->perm[0]&0x40)) 146 inop->inode.iso_mode |= S_IXOTH; 147 if (!(ap->perm[0]&0x10)) 148 inop->inode.iso_mode |= S_IROTH; 149 if (!(ap->perm[0]&4)) 150 inop->inode.iso_mode |= S_IXGRP; 151 if (!(ap->perm[0]&1)) 152 inop->inode.iso_mode |= S_IRGRP; 153 if (!(ap->perm[1]&0x40)) 154 inop->inode.iso_mode |= S_IXUSR; 155 if (!(ap->perm[1]&0x10)) 156 inop->inode.iso_mode |= S_IRUSR; 157 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 158 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 159 } else 160 ap = NULL; 161 } 162 if (!ap) { 163 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 164 inop->inode.iso_uid = (uid_t)0; 165 inop->inode.iso_gid = (gid_t)0; 166 } 167 if (bp2) 168 brelse(bp2); 169 } 170 171 /* 172 * Time stamps 173 */ 174 void 175 cd9660_deftstamp(isodir,inop,bp,ftype) 176 struct iso_directory_record *isodir; 177 struct iso_node *inop; 178 struct buf *bp; 179 enum ISO_FTYPE ftype; 180 { 181 struct buf *bp2 = NULL; 182 struct iso_mnt *imp; 183 struct iso_extended_attributes *ap = NULL; 184 int off; 185 186 if (!bp 187 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 188 && (off = isonum_711(isodir->ext_attr_length))) { 189 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 190 &bp2); 191 bp = bp2; 192 } 193 if (bp) { 194 ap = (struct iso_extended_attributes *)bp->b_data; 195 196 if (ftype != ISO_FTYPE_HIGH_SIERRA 197 && isonum_711(ap->version) == 1) { 198 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 199 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 200 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 201 inop->inode.iso_ctime = inop->inode.iso_atime; 202 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 203 inop->inode.iso_mtime = inop->inode.iso_ctime; 204 } else 205 ap = NULL; 206 } 207 if (!ap) { 208 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 209 inop->inode.iso_atime = inop->inode.iso_ctime; 210 inop->inode.iso_mtime = inop->inode.iso_ctime; 211 } 212 if (bp2) 213 brelse(bp2); 214 } 215 216 int 217 cd9660_tstamp_conv7(pi,pu,ftype) 218 u_char *pi; 219 struct timespec *pu; 220 enum ISO_FTYPE ftype; 221 { 222 int crtime, days; 223 int y, m, d, hour, minute, second, tz; 224 225 y = pi[0] + 1900; 226 m = pi[1]; 227 d = pi[2]; 228 hour = pi[3]; 229 minute = pi[4]; 230 second = pi[5]; 231 if(ftype != ISO_FTYPE_HIGH_SIERRA) 232 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 233 else 234 /* original high sierra misses timezone data */ 235 tz = 0; 236 237 if (y < 1970) { 238 pu->tv_sec = 0; 239 pu->tv_nsec = 0; 240 return 0; 241 } else { 242 #ifdef ORIGINAL 243 /* computes day number relative to Sept. 19th,1989 */ 244 /* don't even *THINK* about changing formula. It works! */ 245 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 246 #else 247 /* 248 * Changed :-) to make it relative to Jan. 1st, 1970 249 * and to disambiguate negative division 250 */ 251 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 252 #endif 253 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 254 255 /* timezone offset is unreliable on some disks */ 256 if (-48 <= tz && tz <= 52) 257 crtime -= tz * 15 * 60; 258 } 259 pu->tv_sec = crtime; 260 pu->tv_nsec = 0; 261 return 1; 262 } 263 264 static u_int 265 cd9660_chars2ui(begin,len) 266 u_char *begin; 267 int len; 268 { 269 u_int rc; 270 271 for (rc = 0; --len >= 0;) { 272 rc *= 10; 273 rc += *begin++ - '0'; 274 } 275 return rc; 276 } 277 278 int 279 cd9660_tstamp_conv17(pi,pu) 280 u_char *pi; 281 struct timespec *pu; 282 { 283 u_char buf[7]; 284 285 /* year:"0001"-"9999" -> -1900 */ 286 buf[0] = cd9660_chars2ui(pi,4) - 1900; 287 288 /* month: " 1"-"12" -> 1 - 12 */ 289 buf[1] = cd9660_chars2ui(pi + 4,2); 290 291 /* day: " 1"-"31" -> 1 - 31 */ 292 buf[2] = cd9660_chars2ui(pi + 6,2); 293 294 /* hour: " 0"-"23" -> 0 - 23 */ 295 buf[3] = cd9660_chars2ui(pi + 8,2); 296 297 /* minute:" 0"-"59" -> 0 - 59 */ 298 buf[4] = cd9660_chars2ui(pi + 10,2); 299 300 /* second:" 0"-"59" -> 0 - 59 */ 301 buf[5] = cd9660_chars2ui(pi + 12,2); 302 303 /* difference of GMT */ 304 buf[6] = pi[16]; 305 306 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 307 } 308 309 cd_ino_t 310 isodirino(isodir, imp) 311 struct iso_directory_record *isodir; 312 struct iso_mnt *imp; 313 { 314 cd_ino_t ino; 315 316 /* 317 * Note there is an inverse calculation in 318 * cd9660_vfsops.c:cd9660_vget_internal(): 319 * ip->iso_start = ino >> imp->im_bshift; 320 * and also a calculation of the isodir pointer 321 * from an inode in cd9660_vnops.c:cd9660_readlink() 322 */ 323 ino = ((cd_ino_t)isonum_733(isodir->extent) + 324 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 325 return ino; 326 } 327