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 struct thread *a_td; 90 } */ *ap; 91 { 92 struct vnode *vp = ap->a_vp; 93 94 /* 95 * Destroy the vm object and flush associated pages. 96 */ 97 vnode_destroy_vobject(vp); 98 /* 99 * Remove the inode from its hash chain. 100 */ 101 vfs_hash_remove(vp); 102 103 /* 104 * Purge old data structures associated with the inode. 105 */ 106 free(vp->v_data, M_ISOFSNODE); 107 vp->v_data = NULL; 108 return (0); 109 } 110 111 /* 112 * File attributes 113 */ 114 void 115 cd9660_defattr(isodir, inop, bp, ftype) 116 struct iso_directory_record *isodir; 117 struct iso_node *inop; 118 struct buf *bp; 119 enum ISO_FTYPE ftype; 120 { 121 struct buf *bp2 = NULL; 122 struct iso_mnt *imp; 123 struct iso_extended_attributes *ap = NULL; 124 int off; 125 126 /* high sierra does not have timezone data, flag is one byte ahead */ 127 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 128 &isodir->date[6]: isodir->flags)&2) { 129 inop->inode.iso_mode = S_IFDIR; 130 /* 131 * If we return 2, fts() will assume there are no subdirectories 132 * (just links for the path and .), so instead we return 1. 133 */ 134 inop->inode.iso_links = 1; 135 } else { 136 inop->inode.iso_mode = S_IFREG; 137 inop->inode.iso_links = 1; 138 } 139 if (!bp 140 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 141 && (off = isonum_711(isodir->ext_attr_length))) { 142 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 143 &bp2); 144 bp = bp2; 145 } 146 if (bp) { 147 ap = (struct iso_extended_attributes *)bp->b_data; 148 149 if (isonum_711(ap->version) == 1) { 150 if (!(ap->perm[0]&0x40)) 151 inop->inode.iso_mode |= S_IXOTH; 152 if (!(ap->perm[0]&0x10)) 153 inop->inode.iso_mode |= S_IROTH; 154 if (!(ap->perm[0]&4)) 155 inop->inode.iso_mode |= S_IXGRP; 156 if (!(ap->perm[0]&1)) 157 inop->inode.iso_mode |= S_IRGRP; 158 if (!(ap->perm[1]&0x40)) 159 inop->inode.iso_mode |= S_IXUSR; 160 if (!(ap->perm[1]&0x10)) 161 inop->inode.iso_mode |= S_IRUSR; 162 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 163 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 164 } else 165 ap = NULL; 166 } 167 if (!ap) { 168 inop->inode.iso_mode |= S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 169 inop->inode.iso_uid = (uid_t)0; 170 inop->inode.iso_gid = (gid_t)0; 171 } 172 if (bp2) 173 brelse(bp2); 174 } 175 176 /* 177 * Time stamps 178 */ 179 void 180 cd9660_deftstamp(isodir,inop,bp,ftype) 181 struct iso_directory_record *isodir; 182 struct iso_node *inop; 183 struct buf *bp; 184 enum ISO_FTYPE ftype; 185 { 186 struct buf *bp2 = NULL; 187 struct iso_mnt *imp; 188 struct iso_extended_attributes *ap = NULL; 189 int off; 190 191 if (!bp 192 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 193 && (off = isonum_711(isodir->ext_attr_length))) { 194 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 195 &bp2); 196 bp = bp2; 197 } 198 if (bp) { 199 ap = (struct iso_extended_attributes *)bp->b_data; 200 201 if (ftype != ISO_FTYPE_HIGH_SIERRA 202 && isonum_711(ap->version) == 1) { 203 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 204 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 205 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 206 inop->inode.iso_ctime = inop->inode.iso_atime; 207 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 208 inop->inode.iso_mtime = inop->inode.iso_ctime; 209 } else 210 ap = NULL; 211 } 212 if (!ap) { 213 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 214 inop->inode.iso_atime = inop->inode.iso_ctime; 215 inop->inode.iso_mtime = inop->inode.iso_ctime; 216 } 217 if (bp2) 218 brelse(bp2); 219 } 220 221 int 222 cd9660_tstamp_conv7(pi,pu,ftype) 223 u_char *pi; 224 struct timespec *pu; 225 enum ISO_FTYPE ftype; 226 { 227 int crtime, days; 228 int y, m, d, hour, minute, second, tz; 229 230 y = pi[0] + 1900; 231 m = pi[1]; 232 d = pi[2]; 233 hour = pi[3]; 234 minute = pi[4]; 235 second = pi[5]; 236 if(ftype != ISO_FTYPE_HIGH_SIERRA) 237 tz = ((signed char *)pi)[6]; /* Timezone value is signed. */ 238 else 239 /* original high sierra misses timezone data */ 240 tz = 0; 241 242 if (y < 1970) { 243 pu->tv_sec = 0; 244 pu->tv_nsec = 0; 245 return 0; 246 } else { 247 #ifdef ORIGINAL 248 /* computes day number relative to Sept. 19th,1989 */ 249 /* don't even *THINK* about changing formula. It works! */ 250 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 251 #else 252 /* 253 * Changed :-) to make it relative to Jan. 1st, 1970 254 * and to disambiguate negative division 255 */ 256 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 257 #endif 258 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 259 260 /* timezone offset is unreliable on some disks */ 261 if (-48 <= tz && tz <= 52) 262 crtime -= tz * 15 * 60; 263 } 264 pu->tv_sec = crtime; 265 pu->tv_nsec = 0; 266 return 1; 267 } 268 269 static u_int 270 cd9660_chars2ui(begin,len) 271 u_char *begin; 272 int len; 273 { 274 u_int rc; 275 276 for (rc = 0; --len >= 0;) { 277 rc *= 10; 278 rc += *begin++ - '0'; 279 } 280 return rc; 281 } 282 283 int 284 cd9660_tstamp_conv17(pi,pu) 285 u_char *pi; 286 struct timespec *pu; 287 { 288 u_char buf[7]; 289 290 /* year:"0001"-"9999" -> -1900 */ 291 buf[0] = cd9660_chars2ui(pi,4) - 1900; 292 293 /* month: " 1"-"12" -> 1 - 12 */ 294 buf[1] = cd9660_chars2ui(pi + 4,2); 295 296 /* day: " 1"-"31" -> 1 - 31 */ 297 buf[2] = cd9660_chars2ui(pi + 6,2); 298 299 /* hour: " 0"-"23" -> 0 - 23 */ 300 buf[3] = cd9660_chars2ui(pi + 8,2); 301 302 /* minute:" 0"-"59" -> 0 - 59 */ 303 buf[4] = cd9660_chars2ui(pi + 10,2); 304 305 /* second:" 0"-"59" -> 0 - 59 */ 306 buf[5] = cd9660_chars2ui(pi + 12,2); 307 308 /* difference of GMT */ 309 buf[6] = pi[16]; 310 311 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 312 } 313 314 cd_ino_t 315 isodirino(isodir, imp) 316 struct iso_directory_record *isodir; 317 struct iso_mnt *imp; 318 { 319 cd_ino_t ino; 320 321 /* 322 * Note there is an inverse calculation in 323 * cd9660_vfsops.c:cd9660_vget_internal(): 324 * ip->iso_start = ino >> imp->im_bshift; 325 * and also a calculation of the isodir pointer 326 * from an inode in cd9660_vnops.c:cd9660_readlink() 327 */ 328 ino = ((cd_ino_t)isonum_733(isodir->extent) + 329 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 330 return ino; 331 } 332