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 } */ *ap; 67 { 68 struct vnode *vp = ap->a_vp; 69 struct iso_node *ip = VTOI(vp); 70 int error = 0; 71 72 /* 73 * If we are done with the inode, reclaim it 74 * so that it can be reused immediately. 75 */ 76 if (ip->inode.iso_mode == 0) 77 vrecycle(vp); 78 return error; 79 } 80 81 /* 82 * Reclaim an inode so that it can be used for other purposes. 83 */ 84 int 85 cd9660_reclaim(ap) 86 struct vop_reclaim_args /* { 87 struct vnode *a_vp; 88 } */ *ap; 89 { 90 struct vnode *vp = ap->a_vp; 91 92 /* 93 * Remove the inode from its hash chain. 94 */ 95 vfs_hash_remove(vp); 96 97 /* 98 * Purge old data structures associated with the inode. 99 */ 100 free(vp->v_data, M_ISOFSNODE); 101 vp->v_data = NULL; 102 return (0); 103 } 104 105 /* 106 * File attributes 107 */ 108 void 109 cd9660_defattr(isodir, inop, bp, ftype) 110 struct iso_directory_record *isodir; 111 struct iso_node *inop; 112 struct buf *bp; 113 enum ISO_FTYPE ftype; 114 { 115 struct buf *bp2 = NULL; 116 struct iso_mnt *imp; 117 struct iso_extended_attributes *ap = NULL; 118 int off; 119 120 /* high sierra does not have timezone data, flag is one byte ahead */ 121 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 122 &isodir->date[6]: isodir->flags)&2) { 123 inop->inode.iso_mode = S_IFDIR; 124 /* 125 * If we return 2, fts() will assume there are no subdirectories 126 * (just links for the path and .), so instead we return 1. 127 */ 128 inop->inode.iso_links = 1; 129 } else { 130 inop->inode.iso_mode = S_IFREG; 131 inop->inode.iso_links = 1; 132 } 133 if (!bp 134 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 135 && (off = isonum_711(isodir->ext_attr_length))) { 136 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 137 &bp2); 138 bp = bp2; 139 } 140 if (bp) { 141 ap = (struct iso_extended_attributes *)bp->b_data; 142 143 if (isonum_711(ap->version) == 1) { 144 if (!(ap->perm[0]&0x40)) 145 inop->inode.iso_mode |= S_IXOTH; 146 if (!(ap->perm[0]&0x10)) 147 inop->inode.iso_mode |= S_IROTH; 148 if (!(ap->perm[0]&4)) 149 inop->inode.iso_mode |= S_IXGRP; 150 if (!(ap->perm[0]&1)) 151 inop->inode.iso_mode |= S_IRGRP; 152 if (!(ap->perm[1]&0x40)) 153 inop->inode.iso_mode |= S_IXUSR; 154 if (!(ap->perm[1]&0x10)) 155 inop->inode.iso_mode |= S_IRUSR; 156 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 157 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 158 } else 159 ap = NULL; 160 } 161 if (!ap) { 162 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 163 inop->inode.iso_uid = (uid_t)0; 164 inop->inode.iso_gid = (gid_t)0; 165 } 166 if (bp2) 167 brelse(bp2); 168 } 169 170 /* 171 * Time stamps 172 */ 173 void 174 cd9660_deftstamp(isodir,inop,bp,ftype) 175 struct iso_directory_record *isodir; 176 struct iso_node *inop; 177 struct buf *bp; 178 enum ISO_FTYPE ftype; 179 { 180 struct buf *bp2 = NULL; 181 struct iso_mnt *imp; 182 struct iso_extended_attributes *ap = NULL; 183 int off; 184 185 if (!bp 186 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 187 && (off = isonum_711(isodir->ext_attr_length))) { 188 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 189 &bp2); 190 bp = bp2; 191 } 192 if (bp) { 193 ap = (struct iso_extended_attributes *)bp->b_data; 194 195 if (ftype != ISO_FTYPE_HIGH_SIERRA 196 && isonum_711(ap->version) == 1) { 197 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 198 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 199 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 200 inop->inode.iso_ctime = inop->inode.iso_atime; 201 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 202 inop->inode.iso_mtime = inop->inode.iso_ctime; 203 } else 204 ap = NULL; 205 } 206 if (!ap) { 207 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 208 inop->inode.iso_atime = inop->inode.iso_ctime; 209 inop->inode.iso_mtime = inop->inode.iso_ctime; 210 } 211 if (bp2) 212 brelse(bp2); 213 } 214 215 int 216 cd9660_tstamp_conv7(pi,pu,ftype) 217 u_char *pi; 218 struct timespec *pu; 219 enum ISO_FTYPE ftype; 220 { 221 int crtime, days; 222 int y, m, d, hour, minute, second, tz; 223 224 y = pi[0] + 1900; 225 m = pi[1]; 226 d = pi[2]; 227 hour = pi[3]; 228 minute = pi[4]; 229 second = pi[5]; 230 if(ftype != ISO_FTYPE_HIGH_SIERRA) 231 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 232 else 233 /* original high sierra misses timezone data */ 234 tz = 0; 235 236 if (y < 1970) { 237 pu->tv_sec = 0; 238 pu->tv_nsec = 0; 239 return 0; 240 } else { 241 #ifdef ORIGINAL 242 /* computes day number relative to Sept. 19th,1989 */ 243 /* don't even *THINK* about changing formula. It works! */ 244 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 245 #else 246 /* 247 * Changed :-) to make it relative to Jan. 1st, 1970 248 * and to disambiguate negative division 249 */ 250 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 251 #endif 252 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 253 254 /* timezone offset is unreliable on some disks */ 255 if (-48 <= tz && tz <= 52) 256 crtime -= tz * 15 * 60; 257 } 258 pu->tv_sec = crtime; 259 pu->tv_nsec = 0; 260 return 1; 261 } 262 263 static u_int 264 cd9660_chars2ui(begin,len) 265 u_char *begin; 266 int len; 267 { 268 u_int rc; 269 270 for (rc = 0; --len >= 0;) { 271 rc *= 10; 272 rc += *begin++ - '0'; 273 } 274 return rc; 275 } 276 277 int 278 cd9660_tstamp_conv17(pi,pu) 279 u_char *pi; 280 struct timespec *pu; 281 { 282 u_char buf[7]; 283 284 /* year:"0001"-"9999" -> -1900 */ 285 buf[0] = cd9660_chars2ui(pi,4) - 1900; 286 287 /* month: " 1"-"12" -> 1 - 12 */ 288 buf[1] = cd9660_chars2ui(pi + 4,2); 289 290 /* day: " 1"-"31" -> 1 - 31 */ 291 buf[2] = cd9660_chars2ui(pi + 6,2); 292 293 /* hour: " 0"-"23" -> 0 - 23 */ 294 buf[3] = cd9660_chars2ui(pi + 8,2); 295 296 /* minute:" 0"-"59" -> 0 - 59 */ 297 buf[4] = cd9660_chars2ui(pi + 10,2); 298 299 /* second:" 0"-"59" -> 0 - 59 */ 300 buf[5] = cd9660_chars2ui(pi + 12,2); 301 302 /* difference of GMT */ 303 buf[6] = pi[16]; 304 305 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 306 } 307 308 cd_ino_t 309 isodirino(isodir, imp) 310 struct iso_directory_record *isodir; 311 struct iso_mnt *imp; 312 { 313 cd_ino_t ino; 314 315 /* 316 * Note there is an inverse calculation in 317 * cd9660_vfsops.c:cd9660_vget_internal(): 318 * ip->iso_start = ino >> imp->im_bshift; 319 * and also a calculation of the isodir pointer 320 * from an inode in cd9660_vnops.c:cd9660_readlink() 321 */ 322 ino = ((cd_ino_t)isonum_733(isodir->extent) + 323 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 324 return ino; 325 } 326