cd9660_node.c revision 1.14
1 /* $NetBSD: cd9660_node.c,v 1.14 2007/02/20 16:21:03 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 2007/02/20 16:21:03 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 struct simplelock cd9660_ihash_slock; 68 69 #ifdef ISODEVMAP 70 LIST_HEAD(idvhashhead, iso_dnode) *idvhashtbl; 71 u_long idvhash; 72 #define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash) 73 #endif 74 75 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 76 77 POOL_INIT(cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, "cd9660nopl", 78 &pool_allocator_nointr); 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 #ifdef _LKM 89 malloc_type_attach(M_ISOFSMNT); 90 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 91 "cd9660nopl", &pool_allocator_nointr); 92 #endif 93 isohashtbl = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 94 &isohash); 95 simple_lock_init(&cd9660_ihash_slock); 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 simple_lock(&cd9660_ihash_slock); 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 simple_unlock(&cd9660_ihash_slock); 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 #ifdef _LKM 169 pool_destroy(&cd9660_node_pool); 170 malloc_type_detach(M_ISOFSMNT); 171 #endif 172 } 173 174 #ifdef ISODEVMAP 175 /* 176 * Enter a new node into the device hash list 177 */ 178 struct iso_dnode * 179 iso_dmap(device, inum, create) 180 dev_t device; 181 ino_t inum; 182 int create; 183 { 184 struct iso_dnode *dp; 185 struct idvhashhead *hp; 186 187 hp = &idvhashtbl[DNOHASH(device, inum)]; 188 LIST_FOREACH(dp, hp, d_hash) { 189 if (inum == dp->i_number && device == dp->i_dev) 190 return (dp); 191 } 192 193 if (!create) 194 return (NULL); 195 196 MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE, 197 M_WAITOK); 198 dp->i_dev = device; 199 dp->i_number = inum; 200 LIST_INSERT_HEAD(hp, dp, d_hash); 201 return (dp); 202 } 203 204 void 205 iso_dunmap(device) 206 dev_t device; 207 { 208 struct idvhashhead *dpp; 209 struct iso_dnode *dp, *dq; 210 211 for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) { 212 for (dp = LIST_FIRST(dpp); dp != NULL; dp = dq) { 213 dq = LIST_NEXT(dp, d_hash); 214 if (device == dp->i_dev) { 215 LIST_REMOVE(dp, d_hash); 216 FREE(dp, M_CACHE); 217 } 218 } 219 } 220 } 221 #endif 222 223 /* 224 * Use the device/inum pair to find the incore inode, and return a pointer 225 * to it. If it is in core, but locked, wait for it. 226 */ 227 struct vnode * 228 cd9660_ihashget(dev, inum) 229 dev_t dev; 230 ino_t inum; 231 { 232 struct iso_node *ip; 233 struct vnode *vp; 234 235 loop: 236 simple_lock(&cd9660_ihash_slock); 237 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 238 if (inum == ip->i_number && dev == ip->i_dev) { 239 vp = ITOV(ip); 240 simple_lock(&vp->v_interlock); 241 simple_unlock(&cd9660_ihash_slock); 242 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 243 goto loop; 244 return (vp); 245 } 246 } 247 simple_unlock(&cd9660_ihash_slock); 248 return (NULL); 249 } 250 251 /* 252 * Insert the inode into the hash table, and return it locked. 253 * 254 * ip->i_vnode must be initialized first. 255 */ 256 void 257 cd9660_ihashins(ip) 258 struct iso_node *ip; 259 { 260 struct ihashhead *ipp; 261 262 simple_lock(&cd9660_ihash_slock); 263 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 264 LIST_INSERT_HEAD(ipp, ip, i_hash); 265 simple_unlock(&cd9660_ihash_slock); 266 267 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 268 } 269 270 /* 271 * Remove the inode from the hash table. 272 */ 273 void 274 cd9660_ihashrem(ip) 275 struct iso_node *ip; 276 { 277 simple_lock(&cd9660_ihash_slock); 278 LIST_REMOVE(ip, i_hash); 279 simple_unlock(&cd9660_ihash_slock); 280 } 281 282 /* 283 * Last reference to an inode, write the inode out and if necessary, 284 * truncate and deallocate the file. 285 */ 286 int 287 cd9660_inactive(v) 288 void *v; 289 { 290 struct vop_inactive_args /* { 291 struct vnode *a_vp; 292 struct lwp *a_l; 293 } */ *ap = v; 294 struct vnode *vp = ap->a_vp; 295 struct lwp *l = ap->a_l; 296 struct iso_node *ip = VTOI(vp); 297 int error = 0; 298 299 if (prtactive && vp->v_usecount != 0) 300 vprint("cd9660_inactive: pushing active", vp); 301 302 ip->i_flag = 0; 303 VOP_UNLOCK(vp, 0); 304 /* 305 * If we are done with the inode, reclaim it 306 * so that it can be reused immediately. 307 */ 308 if (ip->inode.iso_mode == 0) 309 vrecycle(vp, (struct simplelock *)0, l); 310 return error; 311 } 312 313 /* 314 * Reclaim an inode so that it can be used for other purposes. 315 */ 316 int 317 cd9660_reclaim(v) 318 void *v; 319 { 320 struct vop_reclaim_args /* { 321 struct vnode *a_vp; 322 struct lwp *a_l; 323 } */ *ap = v; 324 struct vnode *vp = ap->a_vp; 325 struct iso_node *ip = VTOI(vp); 326 327 if (prtactive && vp->v_usecount != 0) 328 vprint("cd9660_reclaim: pushing active", vp); 329 /* 330 * Remove the inode from its hash chain. 331 */ 332 cd9660_ihashrem(ip); 333 /* 334 * Purge old data structures associated with the inode. 335 */ 336 cache_purge(vp); 337 if (ip->i_devvp) { 338 vrele(ip->i_devvp); 339 ip->i_devvp = 0; 340 } 341 genfs_node_destroy(vp); 342 pool_put(&cd9660_node_pool, vp->v_data); 343 vp->v_data = NULL; 344 return (0); 345 } 346 347 /* 348 * File attributes 349 */ 350 void 351 cd9660_defattr(isodir, inop, bp) 352 struct iso_directory_record *isodir; 353 struct iso_node *inop; 354 struct buf *bp; 355 { 356 struct buf *bp2 = NULL; 357 struct iso_mnt *imp; 358 struct iso_extended_attributes *ap = NULL; 359 int off; 360 361 if (isonum_711(isodir->flags)&2) { 362 inop->inode.iso_mode = S_IFDIR; 363 /* 364 * If we return 2, fts() will assume there are no subdirectories 365 * (just links for the path and .), so instead we return 1. 366 */ 367 inop->inode.iso_links = 1; 368 } else { 369 inop->inode.iso_mode = S_IFREG; 370 inop->inode.iso_links = 1; 371 } 372 if (!bp 373 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 374 && (off = isonum_711(isodir->ext_attr_length))) { 375 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 376 NULL, &bp2); 377 bp = bp2; 378 } 379 if (bp) { 380 ap = (struct iso_extended_attributes *)bp->b_data; 381 382 if (isonum_711(ap->version) == 1) { 383 if (!(ap->perm[1]&0x10)) 384 inop->inode.iso_mode |= S_IRUSR; 385 if (!(ap->perm[1]&0x40)) 386 inop->inode.iso_mode |= S_IXUSR; 387 if (!(ap->perm[0]&0x01)) 388 inop->inode.iso_mode |= S_IRGRP; 389 if (!(ap->perm[0]&0x04)) 390 inop->inode.iso_mode |= S_IXGRP; 391 if (!(ap->perm[0]&0x10)) 392 inop->inode.iso_mode |= S_IROTH; 393 if (!(ap->perm[0]&0x40)) 394 inop->inode.iso_mode |= S_IXOTH; 395 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 396 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 397 } else 398 ap = NULL; 399 } 400 if (!ap) { 401 inop->inode.iso_mode |= 402 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 403 inop->inode.iso_uid = (uid_t)0; 404 inop->inode.iso_gid = (gid_t)0; 405 } 406 if (bp2) 407 brelse(bp2); 408 } 409 410 /* 411 * Time stamps 412 */ 413 void 414 cd9660_deftstamp(isodir,inop,bp) 415 struct iso_directory_record *isodir; 416 struct iso_node *inop; 417 struct buf *bp; 418 { 419 struct buf *bp2 = NULL; 420 struct iso_mnt *imp; 421 struct iso_extended_attributes *ap = NULL; 422 int off; 423 424 if (!bp 425 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 426 && (off = isonum_711(isodir->ext_attr_length))) { 427 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 428 NULL, &bp2); 429 bp = bp2; 430 } 431 if (bp) { 432 ap = (struct iso_extended_attributes *)bp->b_data; 433 434 if (isonum_711(ap->version) == 1) { 435 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 436 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 437 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 438 inop->inode.iso_ctime = inop->inode.iso_atime; 439 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 440 inop->inode.iso_mtime = inop->inode.iso_ctime; 441 } else 442 ap = NULL; 443 } 444 if (!ap) { 445 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 446 inop->inode.iso_atime = inop->inode.iso_ctime; 447 inop->inode.iso_mtime = inop->inode.iso_ctime; 448 } 449 if (bp2) 450 brelse(bp2); 451 } 452 453 int 454 cd9660_tstamp_conv7(pi,pu) 455 u_char *pi; 456 struct timespec *pu; 457 { 458 int crtime, days; 459 int y, m, d, hour, minute, second, tz; 460 461 y = pi[0] + 1900; 462 m = pi[1]; 463 d = pi[2]; 464 hour = pi[3]; 465 minute = pi[4]; 466 second = pi[5]; 467 tz = pi[6]; 468 469 if (y < 1970) { 470 pu->tv_sec = 0; 471 pu->tv_nsec = 0; 472 return 0; 473 } else { 474 #ifdef ORIGINAL 475 /* computes day number relative to Sept. 19th,1989 */ 476 /* don't even *THINK* about changing formula. It works! */ 477 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 478 #else 479 /* 480 * Changed :-) to make it relative to Jan. 1st, 1970 481 * and to disambiguate negative division 482 */ 483 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 484 #endif 485 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 486 487 /* timezone offset is unreliable on some disks */ 488 if (-48 <= tz && tz <= 52) 489 crtime -= tz * 15 * 60; 490 } 491 pu->tv_sec = crtime; 492 pu->tv_nsec = 0; 493 return 1; 494 } 495 496 static u_int 497 cd9660_chars2ui(begin,len) 498 u_char *begin; 499 int len; 500 { 501 u_int rc; 502 503 for (rc = 0; --len >= 0;) { 504 rc *= 10; 505 rc += *begin++ - '0'; 506 } 507 return rc; 508 } 509 510 int 511 cd9660_tstamp_conv17(pi,pu) 512 u_char *pi; 513 struct timespec *pu; 514 { 515 u_char tbuf[7]; 516 517 /* year:"0001"-"9999" -> -1900 */ 518 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 519 520 /* month: " 1"-"12" -> 1 - 12 */ 521 tbuf[1] = cd9660_chars2ui(pi + 4,2); 522 523 /* day: " 1"-"31" -> 1 - 31 */ 524 tbuf[2] = cd9660_chars2ui(pi + 6,2); 525 526 /* hour: " 0"-"23" -> 0 - 23 */ 527 tbuf[3] = cd9660_chars2ui(pi + 8,2); 528 529 /* minute:" 0"-"59" -> 0 - 59 */ 530 tbuf[4] = cd9660_chars2ui(pi + 10,2); 531 532 /* second:" 0"-"59" -> 0 - 59 */ 533 tbuf[5] = cd9660_chars2ui(pi + 12,2); 534 535 /* difference of GMT */ 536 tbuf[6] = pi[16]; 537 538 return cd9660_tstamp_conv7(tbuf,pu); 539 } 540 541 ino_t 542 isodirino(isodir, imp) 543 struct iso_directory_record *isodir; 544 struct iso_mnt *imp; 545 { 546 ino_t ino; 547 548 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 549 << imp->im_bshift; 550 return (ino); 551 } 552
Indexes created Tue Sep 23 07:09:52 GMT 2025