cd9660_node.c revision 1.14.4.6
1 /* $NetBSD: cd9660_node.c,v 1.14.4.6 2007/10/24 16:16:31 ad Exp $ */ 2 3 /*- 4 * Copyright (c) 1982, 1986, 1989, 1994 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 (at) blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai (at) 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 8.8 (Berkeley) 5/22/95 37 */ 38 39 #include <sys/cdefs.h> 40 __KERNEL_RCSID(0, "$NetBSD: cd9660_node.c,v 1.14.4.6 2007/10/24 16:16:31 ad Exp $"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/mount.h> 45 #include <sys/proc.h> 46 #include <sys/file.h> 47 #include <sys/buf.h> 48 #include <sys/vnode.h> 49 #include <sys/namei.h> 50 #include <sys/kernel.h> 51 #include <sys/malloc.h> 52 #include <sys/pool.h> 53 #include <sys/stat.h> 54 55 #include <fs/cd9660/iso.h> 56 #include <fs/cd9660/cd9660_extern.h> 57 #include <fs/cd9660/cd9660_node.h> 58 #include <fs/cd9660/cd9660_mount.h> 59 #include <fs/cd9660/iso_rrip.h> 60 61 /* 62 * Structures associated with iso_node caching. 63 */ 64 LIST_HEAD(ihashhead, iso_node) *isohashtbl; 65 u_long isohash; 66 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash) 67 kmutex_t cd9660_ihash_lock; 68 kmutex_t cd9660_hashlock; 69 70 #ifdef ISODEVMAP 71 LIST_HEAD(idvhashhead, iso_dnode) *idvhashtbl; 72 u_long idvhash; 73 #define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash) 74 #endif 75 76 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 77 78 struct pool cd9660_node_pool; 79 80 static u_int cd9660_chars2ui(u_char *, int); 81 82 /* 83 * Initialize hash links for inodes and dnodes. 84 */ 85 void 86 cd9660_init() 87 { 88 89 malloc_type_attach(M_ISOFSMNT); 90 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 91 "cd9660nopl", &pool_allocator_nointr, IPL_NONE); 92 isohashtbl = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 93 &isohash); 94 mutex_init(&cd9660_ihash_lock, MUTEX_DEFAULT, IPL_NONE); 95 mutex_init(&cd9660_hashlock, MUTEX_DEFAULT, IPL_NONE); 96 #ifdef ISODEVMAP 97 idvhashtbl = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT, 98 M_WAITOK, &idvhash); 99 #endif 100 } 101 102 /* 103 * Reinitialize inode hash table. 104 */ 105 106 void 107 cd9660_reinit() 108 { 109 struct iso_node *ip; 110 struct ihashhead *oldhash1, *hash1; 111 u_long oldmask1, mask1, val; 112 #ifdef ISODEVMAP 113 struct iso_dnode *dp; 114 struct idvhashhead *oldhash2, *hash2; 115 u_long oldmask2, mask2; 116 #endif 117 u_int i; 118 119 hash1 = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 120 &mask1); 121 #ifdef ISODEVMAP 122 hash2 = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT, M_WAITOK, 123 &mask2); 124 #endif 125 126 mutex_enter(&cd9660_ihash_lock); 127 oldhash1 = isohashtbl; 128 oldmask1 = isohash; 129 isohashtbl = hash1; 130 isohash = mask1; 131 #ifdef ISODEVMAP 132 oldhash2 = idvhashtbl; 133 oldmask2 = idvhash; 134 idvhashtbl = hash2; 135 idvhash = mask2; 136 for (i = 0; i <= oldmask2; i++) { 137 while ((dp = LIST_FIRST(&oldhash2[i])) != NULL) { 138 LIST_REMOVE(dp, d_hash); 139 val = DNOHASH(dp->i_dev, dp->i_number); 140 LIST_INSERT_HEAD(&hash2[val], dp, d_hash); 141 } 142 } 143 #endif 144 for (i = 0; i <= oldmask1; i++) { 145 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) { 146 LIST_REMOVE(ip, i_hash); 147 val = INOHASH(ip->i_dev, ip->i_number); 148 LIST_INSERT_HEAD(&hash1[val], ip, i_hash); 149 } 150 } 151 mutex_exit(&cd9660_ihash_lock); 152 hashdone(oldhash1, M_ISOFSMNT); 153 #ifdef ISODEVMAP 154 hashdone(oldhash2, M_ISOFSMNT); 155 #endif 156 } 157 158 /* 159 * Destroy node pool and hash table. 160 */ 161 void 162 cd9660_done() 163 { 164 hashdone(isohashtbl, M_ISOFSMNT); 165 #ifdef ISODEVMAP 166 hashdone(idvhashtbl, M_ISOFSMNT); 167 #endif 168 pool_destroy(&cd9660_node_pool); 169 malloc_type_detach(M_ISOFSMNT); 170 } 171 172 #ifdef ISODEVMAP 173 /* 174 * Enter a new node into the device hash list 175 */ 176 struct iso_dnode * 177 iso_dmap(device, inum, create) 178 dev_t device; 179 ino_t inum; 180 int create; 181 { 182 struct iso_dnode *dp; 183 struct idvhashhead *hp; 184 185 hp = &idvhashtbl[DNOHASH(device, inum)]; 186 LIST_FOREACH(dp, hp, d_hash) { 187 if (inum == dp->i_number && device == dp->i_dev) 188 return (dp); 189 } 190 191 if (!create) 192 return (NULL); 193 194 MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE, 195 M_WAITOK); 196 dp->i_dev = device; 197 dp->i_number = inum; 198 LIST_INSERT_HEAD(hp, dp, d_hash); 199 return (dp); 200 } 201 202 void 203 iso_dunmap(device) 204 dev_t device; 205 { 206 struct idvhashhead *dpp; 207 struct iso_dnode *dp, *dq; 208 209 for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) { 210 for (dp = LIST_FIRST(dpp); dp != NULL; dp = dq) { 211 dq = LIST_NEXT(dp, d_hash); 212 if (device == dp->i_dev) { 213 LIST_REMOVE(dp, d_hash); 214 FREE(dp, M_CACHE); 215 } 216 } 217 } 218 } 219 #endif 220 221 /* 222 * Use the device/inum pair to find the incore inode, and return a pointer 223 * to it. If it is in core, but locked, wait for it. 224 */ 225 struct vnode * 226 cd9660_ihashget(dev, inum, flags) 227 dev_t dev; 228 ino_t inum; 229 int flags; 230 { 231 struct iso_node *ip; 232 struct vnode *vp; 233 234 loop: 235 mutex_enter(&cd9660_ihash_lock); 236 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 237 if (inum == ip->i_number && dev == ip->i_dev) { 238 vp = ITOV(ip); 239 if (flags == 0) { 240 mutex_exit(&cd9660_ihash_lock); 241 } else { 242 mutex_enter(&vp->v_interlock); 243 mutex_exit(&cd9660_ihash_lock); 244 if (vget(vp, flags | LK_INTERLOCK)) 245 goto loop; 246 } 247 return (vp); 248 } 249 } 250 mutex_exit(&cd9660_ihash_lock); 251 return (NULL); 252 } 253 254 /* 255 * Insert the inode into the hash table, and return it locked. 256 * 257 * ip->i_vnode must be initialized first. 258 */ 259 void 260 cd9660_ihashins(ip) 261 struct iso_node *ip; 262 { 263 struct ihashhead *ipp; 264 265 KASSERT(mutex_owned(&cd9660_hashlock)); 266 267 mutex_enter(&cd9660_ihash_lock); 268 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 269 LIST_INSERT_HEAD(ipp, ip, i_hash); 270 mutex_exit(&cd9660_ihash_lock); 271 272 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 273 } 274 275 /* 276 * Remove the inode from the hash table. 277 */ 278 void 279 cd9660_ihashrem(ip) 280 struct iso_node *ip; 281 { 282 mutex_enter(&cd9660_ihash_lock); 283 LIST_REMOVE(ip, i_hash); 284 mutex_exit(&cd9660_ihash_lock); 285 } 286 287 /* 288 * Last reference to an inode, write the inode out and if necessary, 289 * truncate and deallocate the file. 290 */ 291 int 292 cd9660_inactive(v) 293 void *v; 294 { 295 struct vop_inactive_args /* { 296 struct vnode *a_vp; 297 bool *a_recycle; 298 } */ *ap = v; 299 struct vnode *vp = ap->a_vp; 300 struct iso_node *ip = VTOI(vp); 301 int error = 0; 302 303 if (prtactive && vp->v_usecount != 0) 304 vprint("cd9660_inactive: pushing active", vp); 305 306 ip->i_flag = 0; 307 VOP_UNLOCK(vp, 0); 308 /* 309 * If we are done with the inode, reclaim it 310 * so that it can be reused immediately. 311 */ 312 *ap->a_recycle = (ip->inode.iso_mode == 0); 313 return error; 314 } 315 316 /* 317 * Reclaim an inode so that it can be used for other purposes. 318 */ 319 int 320 cd9660_reclaim(v) 321 void *v; 322 { 323 struct vop_reclaim_args /* { 324 struct vnode *a_vp; 325 struct lwp *a_l; 326 } */ *ap = v; 327 struct vnode *vp = ap->a_vp; 328 struct iso_node *ip = VTOI(vp); 329 330 if (prtactive && vp->v_usecount != 0) 331 vprint("cd9660_reclaim: pushing active", vp); 332 /* 333 * Remove the inode from its hash chain. 334 */ 335 cd9660_ihashrem(ip); 336 /* 337 * Purge old data structures associated with the inode. 338 */ 339 cache_purge(vp); 340 if (ip->i_devvp) { 341 vrele(ip->i_devvp); 342 ip->i_devvp = 0; 343 } 344 genfs_node_destroy(vp); 345 pool_put(&cd9660_node_pool, vp->v_data); 346 vp->v_data = NULL; 347 return (0); 348 } 349 350 /* 351 * File attributes 352 */ 353 void 354 cd9660_defattr(isodir, inop, bp) 355 struct iso_directory_record *isodir; 356 struct iso_node *inop; 357 struct buf *bp; 358 { 359 struct buf *bp2 = NULL; 360 struct iso_mnt *imp; 361 struct iso_extended_attributes *ap = NULL; 362 int off; 363 364 if (isonum_711(isodir->flags)&2) { 365 inop->inode.iso_mode = S_IFDIR; 366 /* 367 * If we return 2, fts() will assume there are no subdirectories 368 * (just links for the path and .), so instead we return 1. 369 */ 370 inop->inode.iso_links = 1; 371 } else { 372 inop->inode.iso_mode = S_IFREG; 373 inop->inode.iso_links = 1; 374 } 375 if (!bp 376 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 377 && (off = isonum_711(isodir->ext_attr_length))) { 378 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 379 NULL, &bp2); 380 bp = bp2; 381 } 382 if (bp) { 383 ap = (struct iso_extended_attributes *)bp->b_data; 384 385 if (isonum_711(ap->version) == 1) { 386 if (!(ap->perm[1]&0x10)) 387 inop->inode.iso_mode |= S_IRUSR; 388 if (!(ap->perm[1]&0x40)) 389 inop->inode.iso_mode |= S_IXUSR; 390 if (!(ap->perm[0]&0x01)) 391 inop->inode.iso_mode |= S_IRGRP; 392 if (!(ap->perm[0]&0x04)) 393 inop->inode.iso_mode |= S_IXGRP; 394 if (!(ap->perm[0]&0x10)) 395 inop->inode.iso_mode |= S_IROTH; 396 if (!(ap->perm[0]&0x40)) 397 inop->inode.iso_mode |= S_IXOTH; 398 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 399 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 400 } else 401 ap = NULL; 402 } 403 if (!ap) { 404 inop->inode.iso_mode |= 405 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 406 inop->inode.iso_uid = (uid_t)0; 407 inop->inode.iso_gid = (gid_t)0; 408 } 409 if (bp2) 410 brelse(bp2, 0); 411 } 412 413 /* 414 * Time stamps 415 */ 416 void 417 cd9660_deftstamp(isodir,inop,bp) 418 struct iso_directory_record *isodir; 419 struct iso_node *inop; 420 struct buf *bp; 421 { 422 struct buf *bp2 = NULL; 423 struct iso_mnt *imp; 424 struct iso_extended_attributes *ap = NULL; 425 int off; 426 427 if (!bp 428 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 429 && (off = isonum_711(isodir->ext_attr_length))) { 430 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 431 NULL, &bp2); 432 bp = bp2; 433 } 434 if (bp) { 435 ap = (struct iso_extended_attributes *)bp->b_data; 436 437 if (isonum_711(ap->version) == 1) { 438 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 439 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 440 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 441 inop->inode.iso_ctime = inop->inode.iso_atime; 442 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 443 inop->inode.iso_mtime = inop->inode.iso_ctime; 444 } else 445 ap = NULL; 446 } 447 if (!ap) { 448 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 449 inop->inode.iso_atime = inop->inode.iso_ctime; 450 inop->inode.iso_mtime = inop->inode.iso_ctime; 451 } 452 if (bp2) 453 brelse(bp2, 0); 454 } 455 456 int 457 cd9660_tstamp_conv7(pi,pu) 458 u_char *pi; 459 struct timespec *pu; 460 { 461 int crtime, days; 462 int y, m, d, hour, minute, second, tz; 463 464 y = pi[0] + 1900; 465 m = pi[1]; 466 d = pi[2]; 467 hour = pi[3]; 468 minute = pi[4]; 469 second = pi[5]; 470 tz = pi[6]; 471 472 if (y < 1970) { 473 pu->tv_sec = 0; 474 pu->tv_nsec = 0; 475 return 0; 476 } else { 477 #ifdef ORIGINAL 478 /* computes day number relative to Sept. 19th,1989 */ 479 /* don't even *THINK* about changing formula. It works! */ 480 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 481 #else 482 /* 483 * Changed :-) to make it relative to Jan. 1st, 1970 484 * and to disambiguate negative division 485 */ 486 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 487 #endif 488 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 489 490 /* timezone offset is unreliable on some disks */ 491 if (-48 <= tz && tz <= 52) 492 crtime -= tz * 15 * 60; 493 } 494 pu->tv_sec = crtime; 495 pu->tv_nsec = 0; 496 return 1; 497 } 498 499 static u_int 500 cd9660_chars2ui(begin,len) 501 u_char *begin; 502 int len; 503 { 504 u_int rc; 505 506 for (rc = 0; --len >= 0;) { 507 rc *= 10; 508 rc += *begin++ - '0'; 509 } 510 return rc; 511 } 512 513 int 514 cd9660_tstamp_conv17(pi,pu) 515 u_char *pi; 516 struct timespec *pu; 517 { 518 u_char tbuf[7]; 519 520 /* year:"0001"-"9999" -> -1900 */ 521 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 522 523 /* month: " 1"-"12" -> 1 - 12 */ 524 tbuf[1] = cd9660_chars2ui(pi + 4,2); 525 526 /* day: " 1"-"31" -> 1 - 31 */ 527 tbuf[2] = cd9660_chars2ui(pi + 6,2); 528 529 /* hour: " 0"-"23" -> 0 - 23 */ 530 tbuf[3] = cd9660_chars2ui(pi + 8,2); 531 532 /* minute:" 0"-"59" -> 0 - 59 */ 533 tbuf[4] = cd9660_chars2ui(pi + 10,2); 534 535 /* second:" 0"-"59" -> 0 - 59 */ 536 tbuf[5] = cd9660_chars2ui(pi + 12,2); 537 538 /* difference of GMT */ 539 tbuf[6] = pi[16]; 540 541 return cd9660_tstamp_conv7(tbuf,pu); 542 } 543 544 ino_t 545 isodirino(isodir, imp) 546 struct iso_directory_record *isodir; 547 struct iso_mnt *imp; 548 { 549 ino_t ino; 550 551 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 552 << imp->im_bshift; 553 return (ino); 554 } 555
Indexes created Thu Oct 23 22:10:10 GMT 2025