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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94 39 * $FreeBSD$ 40 */ 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 <isofs/cd9660/iso.h> 53 #include <isofs/cd9660/cd9660_node.h> 54 #include <isofs/cd9660/cd9660_mount.h> 55 56 /* 57 * Structures associated with iso_node caching. 58 */ 59 static struct iso_node **isohashtbl; 60 static u_long isohash; 61 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash) 62 static struct mtx cd9660_ihash_mtx; 63 64 static void cd9660_ihashrem(struct iso_node *); 65 static unsigned cd9660_chars2ui(unsigned char *begin, int len); 66 67 /* 68 * Initialize hash links for inodes and dnodes. 69 */ 70 int 71 cd9660_init(vfsp) 72 struct vfsconf *vfsp; 73 { 74 75 isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash); 76 mtx_init(&cd9660_ihash_mtx, "cd9660_ihash", NULL, MTX_DEF); 77 return (0); 78 } 79 80 int 81 cd9660_uninit(vfsp) 82 struct vfsconf *vfsp; 83 { 84 85 if (isohashtbl != NULL) 86 free(isohashtbl, M_ISOFSMNT); 87 return (0); 88 } 89 90 91 /* 92 * Use the device/inum pair to find the incore inode, and return a pointer 93 * to it. If it is in core, but locked, wait for it. 94 */ 95 int 96 cd9660_ihashget(dev, inum, flags, vpp) 97 dev_t dev; 98 ino_t inum; 99 int flags; 100 struct vnode **vpp; 101 { 102 struct thread *td = curthread; /* XXX */ 103 struct iso_node *ip; 104 struct vnode *vp; 105 int error; 106 107 *vpp = NULL; 108 loop: 109 mtx_lock(&cd9660_ihash_mtx); 110 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 111 if (inum == ip->i_number && dev == ip->i_dev) { 112 vp = ITOV(ip); 113 mtx_lock(&vp->v_interlock); 114 mtx_unlock(&cd9660_ihash_mtx); 115 error = vget(vp, flags | LK_INTERLOCK, td); 116 if (error == ENOENT) 117 goto loop; 118 if (error) 119 return (error); 120 *vpp = vp; 121 return (0); 122 } 123 } 124 mtx_unlock(&cd9660_ihash_mtx); 125 return (0); 126 } 127 128 /* 129 * Insert the inode into the hash table, and return it locked. 130 */ 131 void 132 cd9660_ihashins(ip) 133 struct iso_node *ip; 134 { 135 struct iso_node **ipp, *iq; 136 137 mtx_lock(&cd9660_ihash_mtx); 138 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 139 if ((iq = *ipp) != NULL) 140 iq->i_prev = &ip->i_next; 141 ip->i_next = iq; 142 ip->i_prev = ipp; 143 *ipp = ip; 144 mtx_unlock(&cd9660_ihash_mtx); 145 146 vn_lock(ITOV(ip), LK_EXCLUSIVE | LK_RETRY, curthread); 147 } 148 149 /* 150 * Remove the inode from the hash table. 151 */ 152 static void 153 cd9660_ihashrem(ip) 154 register struct iso_node *ip; 155 { 156 register struct iso_node *iq; 157 158 mtx_lock(&cd9660_ihash_mtx); 159 if ((iq = ip->i_next) != NULL) 160 iq->i_prev = ip->i_prev; 161 *ip->i_prev = iq; 162 #ifdef DIAGNOSTIC 163 ip->i_next = NULL; 164 ip->i_prev = NULL; 165 #endif 166 mtx_unlock(&cd9660_ihash_mtx); 167 } 168 169 /* 170 * Last reference to an inode, write the inode out and if necessary, 171 * truncate and deallocate the file. 172 */ 173 int 174 cd9660_inactive(ap) 175 struct vop_inactive_args /* { 176 struct vnode *a_vp; 177 struct thread *a_td; 178 } */ *ap; 179 { 180 struct vnode *vp = ap->a_vp; 181 struct thread *td = ap->a_td; 182 register struct iso_node *ip = VTOI(vp); 183 int error = 0; 184 185 if (prtactive && vrefcnt(vp) != 0) 186 vprint("cd9660_inactive: pushing active", vp); 187 188 ip->i_flag = 0; 189 VOP_UNLOCK(vp, 0, td); 190 /* 191 * If we are done with the inode, reclaim it 192 * so that it can be reused immediately. 193 */ 194 if (ip->inode.iso_mode == 0) 195 vrecycle(vp, NULL, td); 196 return error; 197 } 198 199 /* 200 * Reclaim an inode so that it can be used for other purposes. 201 */ 202 int 203 cd9660_reclaim(ap) 204 struct vop_reclaim_args /* { 205 struct vnode *a_vp; 206 struct thread *a_td; 207 } */ *ap; 208 { 209 register struct vnode *vp = ap->a_vp; 210 register struct iso_node *ip = VTOI(vp); 211 212 if (prtactive && vrefcnt(vp) != 0) 213 vprint("cd9660_reclaim: pushing active", vp); 214 /* 215 * Remove the inode from its hash chain. 216 */ 217 cd9660_ihashrem(ip); 218 /* 219 * Purge old data structures associated with the inode. 220 */ 221 cache_purge(vp); 222 if (ip->i_devvp) { 223 vrele(ip->i_devvp); 224 ip->i_devvp = 0; 225 } 226 FREE(vp->v_data, M_ISOFSNODE); 227 vp->v_data = NULL; 228 return (0); 229 } 230 231 /* 232 * File attributes 233 */ 234 void 235 cd9660_defattr(isodir, inop, bp, ftype) 236 struct iso_directory_record *isodir; 237 struct iso_node *inop; 238 struct buf *bp; 239 enum ISO_FTYPE ftype; 240 { 241 struct buf *bp2 = NULL; 242 struct iso_mnt *imp; 243 struct iso_extended_attributes *ap = NULL; 244 int off; 245 246 /* high sierra does not have timezone data, flag is one byte ahead */ 247 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 248 &isodir->date[6]: isodir->flags)&2) { 249 inop->inode.iso_mode = S_IFDIR; 250 /* 251 * If we return 2, fts() will assume there are no subdirectories 252 * (just links for the path and .), so instead we return 1. 253 */ 254 inop->inode.iso_links = 1; 255 } else { 256 inop->inode.iso_mode = S_IFREG; 257 inop->inode.iso_links = 1; 258 } 259 if (!bp 260 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 261 && (off = isonum_711(isodir->ext_attr_length))) { 262 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 263 &bp2); 264 bp = bp2; 265 } 266 if (bp) { 267 ap = (struct iso_extended_attributes *)bp->b_data; 268 269 if (isonum_711(ap->version) == 1) { 270 if (!(ap->perm[0]&0x40)) 271 inop->inode.iso_mode |= VEXEC >> 6; 272 if (!(ap->perm[0]&0x10)) 273 inop->inode.iso_mode |= VREAD >> 6; 274 if (!(ap->perm[0]&4)) 275 inop->inode.iso_mode |= VEXEC >> 3; 276 if (!(ap->perm[0]&1)) 277 inop->inode.iso_mode |= VREAD >> 3; 278 if (!(ap->perm[1]&0x40)) 279 inop->inode.iso_mode |= VEXEC; 280 if (!(ap->perm[1]&0x10)) 281 inop->inode.iso_mode |= VREAD; 282 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 283 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 284 } else 285 ap = NULL; 286 } 287 if (!ap) { 288 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 289 inop->inode.iso_uid = (uid_t)0; 290 inop->inode.iso_gid = (gid_t)0; 291 } 292 if (bp2) 293 brelse(bp2); 294 } 295 296 /* 297 * Time stamps 298 */ 299 void 300 cd9660_deftstamp(isodir,inop,bp,ftype) 301 struct iso_directory_record *isodir; 302 struct iso_node *inop; 303 struct buf *bp; 304 enum ISO_FTYPE ftype; 305 { 306 struct buf *bp2 = NULL; 307 struct iso_mnt *imp; 308 struct iso_extended_attributes *ap = NULL; 309 int off; 310 311 if (!bp 312 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 313 && (off = isonum_711(isodir->ext_attr_length))) { 314 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 315 &bp2); 316 bp = bp2; 317 } 318 if (bp) { 319 ap = (struct iso_extended_attributes *)bp->b_data; 320 321 if (ftype != ISO_FTYPE_HIGH_SIERRA 322 && isonum_711(ap->version) == 1) { 323 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 324 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 325 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 326 inop->inode.iso_ctime = inop->inode.iso_atime; 327 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 328 inop->inode.iso_mtime = inop->inode.iso_ctime; 329 } else 330 ap = NULL; 331 } 332 if (!ap) { 333 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 334 inop->inode.iso_atime = inop->inode.iso_ctime; 335 inop->inode.iso_mtime = inop->inode.iso_ctime; 336 } 337 if (bp2) 338 brelse(bp2); 339 } 340 341 int 342 cd9660_tstamp_conv7(pi,pu,ftype) 343 u_char *pi; 344 struct timespec *pu; 345 enum ISO_FTYPE ftype; 346 { 347 int crtime, days; 348 int y, m, d, hour, minute, second, tz; 349 350 y = pi[0] + 1900; 351 m = pi[1]; 352 d = pi[2]; 353 hour = pi[3]; 354 minute = pi[4]; 355 second = pi[5]; 356 if(ftype != ISO_FTYPE_HIGH_SIERRA) 357 tz = pi[6]; 358 else 359 /* original high sierra misses timezone data */ 360 tz = 0; 361 362 if (y < 1970) { 363 pu->tv_sec = 0; 364 pu->tv_nsec = 0; 365 return 0; 366 } else { 367 #ifdef ORIGINAL 368 /* computes day number relative to Sept. 19th,1989 */ 369 /* don't even *THINK* about changing formula. It works! */ 370 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 371 #else 372 /* 373 * Changed :-) to make it relative to Jan. 1st, 1970 374 * and to disambiguate negative division 375 */ 376 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 377 #endif 378 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 379 380 /* timezone offset is unreliable on some disks */ 381 if (-48 <= tz && tz <= 52) 382 crtime -= tz * 15 * 60; 383 } 384 pu->tv_sec = crtime; 385 pu->tv_nsec = 0; 386 return 1; 387 } 388 389 static u_int 390 cd9660_chars2ui(begin,len) 391 u_char *begin; 392 int len; 393 { 394 u_int rc; 395 396 for (rc = 0; --len >= 0;) { 397 rc *= 10; 398 rc += *begin++ - '0'; 399 } 400 return rc; 401 } 402 403 int 404 cd9660_tstamp_conv17(pi,pu) 405 u_char *pi; 406 struct timespec *pu; 407 { 408 u_char buf[7]; 409 410 /* year:"0001"-"9999" -> -1900 */ 411 buf[0] = cd9660_chars2ui(pi,4) - 1900; 412 413 /* month: " 1"-"12" -> 1 - 12 */ 414 buf[1] = cd9660_chars2ui(pi + 4,2); 415 416 /* day: " 1"-"31" -> 1 - 31 */ 417 buf[2] = cd9660_chars2ui(pi + 6,2); 418 419 /* hour: " 0"-"23" -> 0 - 23 */ 420 buf[3] = cd9660_chars2ui(pi + 8,2); 421 422 /* minute:" 0"-"59" -> 0 - 59 */ 423 buf[4] = cd9660_chars2ui(pi + 10,2); 424 425 /* second:" 0"-"59" -> 0 - 59 */ 426 buf[5] = cd9660_chars2ui(pi + 12,2); 427 428 /* difference of GMT */ 429 buf[6] = pi[16]; 430 431 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 432 } 433 434 ino_t 435 isodirino(isodir, imp) 436 struct iso_directory_record *isodir; 437 struct iso_mnt *imp; 438 { 439 ino_t ino; 440 441 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 442 << imp->im_bshift; 443 return (ino); 444 } 445