cd9660_node.c revision 1.6
1 /* $NetBSD: cd9660_node.c,v 1.6 2004/03/27 04:43:43 atatat 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 1.6 2004/03/27 04:43:43 atatat 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 struct pool cd9660_node_pool; 78 79 static u_int cd9660_chars2ui __P((u_char *, int)); 80 81 /* 82 * Initialize hash links for inodes and dnodes. 83 */ 84 void 85 cd9660_init() 86 { 87 #ifdef _LKM 88 malloc_type_attach(M_ISOFSMNT); 89 #endif 90 isohashtbl = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 91 &isohash); 92 simple_lock_init(&cd9660_ihash_slock); 93 #ifdef ISODEVMAP 94 idvhashtbl = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT, 95 M_WAITOK, &idvhash); 96 #endif 97 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 98 "cd9660nopl", &pool_allocator_nointr); 99 } 100 101 /* 102 * Reinitialize inode hash table. 103 */ 104 105 void 106 cd9660_reinit() 107 { 108 struct iso_node *ip; 109 struct ihashhead *oldhash1, *hash1; 110 u_long oldmask1, mask1, val; 111 #ifdef ISODEVMAP 112 struct iso_dnode *dp; 113 struct idvhashhead *oldhash2, *hash2; 114 u_long oldmask2, mask2; 115 #endif 116 u_int i; 117 118 hash1 = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 119 &mask1); 120 #ifdef ISODEVMAP 121 hash2 = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT, M_WAITOK, 122 &mask2); 123 #endif 124 125 simple_lock(&cd9660_ihash_slock); 126 oldhash1 = isohashtbl; 127 oldmask1 = isohash; 128 isohashtbl = hash1; 129 isohash = mask1; 130 #ifdef ISODEVMAP 131 oldhash2 = idvhashtbl; 132 oldmask2 = idvhash; 133 idvhashtbl = hash2; 134 idvhash = mask2; 135 for (i = 0; i <= oldmask2; i++) { 136 while ((dp = LIST_FIRST(&oldhash2[i])) != NULL) { 137 LIST_REMOVE(dp, d_hash); 138 val = DNOHASH(dp->i_dev, dp->i_number); 139 LIST_INSERT_HEAD(&hash2[val], dp, d_hash); 140 } 141 } 142 #endif 143 for (i = 0; i <= oldmask1; i++) { 144 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) { 145 LIST_REMOVE(ip, i_hash); 146 val = INOHASH(ip->i_dev, ip->i_number); 147 LIST_INSERT_HEAD(&hash1[val], ip, i_hash); 148 } 149 } 150 simple_unlock(&cd9660_ihash_slock); 151 hashdone(oldhash1, M_ISOFSMNT); 152 #ifdef ISODEVMAP 153 hashdone(oldhash2, M_ISOFSMNT); 154 #endif 155 } 156 157 /* 158 * Destroy node pool and hash table. 159 */ 160 void 161 cd9660_done() 162 { 163 hashdone(isohashtbl, M_ISOFSMNT); 164 #ifdef ISODEVMAP 165 hashdone(idvhashtbl, M_ISOFSMNT); 166 #endif 167 pool_destroy(&cd9660_node_pool); 168 #ifdef _LKM 169 malloc_type_detach(M_ISOFSMNT); 170 #endif 171 } 172 173 #ifdef ISODEVMAP 174 /* 175 * Enter a new node into the device hash list 176 */ 177 struct iso_dnode * 178 iso_dmap(device, inum, create) 179 dev_t device; 180 ino_t inum; 181 int create; 182 { 183 struct iso_dnode *dp; 184 struct idvhashhead *hp; 185 186 hp = &idvhashtbl[DNOHASH(device, inum)]; 187 LIST_FOREACH(dp, hp, d_hash) { 188 if (inum == dp->i_number && device == dp->i_dev) 189 return (dp); 190 } 191 192 if (!create) 193 return (NULL); 194 195 MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE, 196 M_WAITOK); 197 dp->i_dev = device; 198 dp->i_number = inum; 199 LIST_INSERT_HEAD(hp, dp, d_hash); 200 return (dp); 201 } 202 203 void 204 iso_dunmap(device) 205 dev_t device; 206 { 207 struct idvhashhead *dpp; 208 struct iso_dnode *dp, *dq; 209 210 for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) { 211 for (dp = LIST_FIRST(dpp); dp != NULL; dp = dq) { 212 dq = LIST_NEXT(dp, d_hash); 213 if (device == dp->i_dev) { 214 LIST_REMOVE(dp, d_hash); 215 FREE(dp, M_CACHE); 216 } 217 } 218 } 219 } 220 #endif 221 222 /* 223 * Use the device/inum pair to find the incore inode, and return a pointer 224 * to it. If it is in core, but locked, wait for it. 225 */ 226 struct vnode * 227 cd9660_ihashget(dev, inum) 228 dev_t dev; 229 ino_t inum; 230 { 231 struct iso_node *ip; 232 struct vnode *vp; 233 234 loop: 235 simple_lock(&cd9660_ihash_slock); 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 simple_lock(&vp->v_interlock); 240 simple_unlock(&cd9660_ihash_slock); 241 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 242 goto loop; 243 return (vp); 244 } 245 } 246 simple_unlock(&cd9660_ihash_slock); 247 return (NULL); 248 } 249 250 /* 251 * Insert the inode into the hash table, and return it locked. 252 * 253 * ip->i_vnode must be initialized first. 254 */ 255 void 256 cd9660_ihashins(ip) 257 struct iso_node *ip; 258 { 259 struct ihashhead *ipp; 260 261 simple_lock(&cd9660_ihash_slock); 262 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 263 LIST_INSERT_HEAD(ipp, ip, i_hash); 264 simple_unlock(&cd9660_ihash_slock); 265 266 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 267 } 268 269 /* 270 * Remove the inode from the hash table. 271 */ 272 void 273 cd9660_ihashrem(ip) 274 struct iso_node *ip; 275 { 276 simple_lock(&cd9660_ihash_slock); 277 LIST_REMOVE(ip, i_hash); 278 simple_unlock(&cd9660_ihash_slock); 279 } 280 281 /* 282 * Last reference to an inode, write the inode out and if necessary, 283 * truncate and deallocate the file. 284 */ 285 int 286 cd9660_inactive(v) 287 void *v; 288 { 289 struct vop_inactive_args /* { 290 struct vnode *a_vp; 291 struct proc *a_p; 292 } */ *ap = v; 293 struct vnode *vp = ap->a_vp; 294 struct proc *p = ap->a_p; 295 struct iso_node *ip = VTOI(vp); 296 int error = 0; 297 298 if (prtactive && vp->v_usecount != 0) 299 vprint("cd9660_inactive: pushing active", vp); 300 301 ip->i_flag = 0; 302 VOP_UNLOCK(vp, 0); 303 /* 304 * If we are done with the inode, reclaim it 305 * so that it can be reused immediately. 306 */ 307 if (ip->inode.iso_mode == 0) 308 vrecycle(vp, (struct simplelock *)0, p); 309 return error; 310 } 311 312 /* 313 * Reclaim an inode so that it can be used for other purposes. 314 */ 315 int 316 cd9660_reclaim(v) 317 void *v; 318 { 319 struct vop_reclaim_args /* { 320 struct vnode *a_vp; 321 struct proc *a_p; 322 } */ *ap = v; 323 struct vnode *vp = ap->a_vp; 324 struct iso_node *ip = VTOI(vp); 325 326 if (prtactive && vp->v_usecount != 0) 327 vprint("cd9660_reclaim: pushing active", vp); 328 /* 329 * Remove the inode from its hash chain. 330 */ 331 cd9660_ihashrem(ip); 332 /* 333 * Purge old data structures associated with the inode. 334 */ 335 cache_purge(vp); 336 if (ip->i_devvp) { 337 vrele(ip->i_devvp); 338 ip->i_devvp = 0; 339 } 340 pool_put(&cd9660_node_pool, vp->v_data); 341 vp->v_data = NULL; 342 return (0); 343 } 344 345 /* 346 * File attributes 347 */ 348 void 349 cd9660_defattr(isodir, inop, bp) 350 struct iso_directory_record *isodir; 351 struct iso_node *inop; 352 struct buf *bp; 353 { 354 struct buf *bp2 = NULL; 355 struct iso_mnt *imp; 356 struct iso_extended_attributes *ap = NULL; 357 int off; 358 359 if (isonum_711(isodir->flags)&2) { 360 inop->inode.iso_mode = S_IFDIR; 361 /* 362 * If we return 2, fts() will assume there are no subdirectories 363 * (just links for the path and .), so instead we return 1. 364 */ 365 inop->inode.iso_links = 1; 366 } else { 367 inop->inode.iso_mode = S_IFREG; 368 inop->inode.iso_links = 1; 369 } 370 if (!bp 371 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 372 && (off = isonum_711(isodir->ext_attr_length))) { 373 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 374 &bp2); 375 bp = bp2; 376 } 377 if (bp) { 378 ap = (struct iso_extended_attributes *)bp->b_data; 379 380 if (isonum_711(ap->version) == 1) { 381 if (!(ap->perm[1]&0x10)) 382 inop->inode.iso_mode |= S_IRUSR; 383 if (!(ap->perm[1]&0x40)) 384 inop->inode.iso_mode |= S_IXUSR; 385 if (!(ap->perm[0]&0x01)) 386 inop->inode.iso_mode |= S_IRGRP; 387 if (!(ap->perm[0]&0x04)) 388 inop->inode.iso_mode |= S_IXGRP; 389 if (!(ap->perm[0]&0x10)) 390 inop->inode.iso_mode |= S_IROTH; 391 if (!(ap->perm[0]&0x40)) 392 inop->inode.iso_mode |= S_IXOTH; 393 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 394 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 395 } else 396 ap = NULL; 397 } 398 if (!ap) { 399 inop->inode.iso_mode |= 400 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 401 inop->inode.iso_uid = (uid_t)0; 402 inop->inode.iso_gid = (gid_t)0; 403 } 404 if (bp2) 405 brelse(bp2); 406 } 407 408 /* 409 * Time stamps 410 */ 411 void 412 cd9660_deftstamp(isodir,inop,bp) 413 struct iso_directory_record *isodir; 414 struct iso_node *inop; 415 struct buf *bp; 416 { 417 struct buf *bp2 = NULL; 418 struct iso_mnt *imp; 419 struct iso_extended_attributes *ap = NULL; 420 int off; 421 422 if (!bp 423 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 424 && (off = isonum_711(isodir->ext_attr_length))) { 425 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 426 &bp2); 427 bp = bp2; 428 } 429 if (bp) { 430 ap = (struct iso_extended_attributes *)bp->b_data; 431 432 if (isonum_711(ap->version) == 1) { 433 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 434 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 435 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 436 inop->inode.iso_ctime = inop->inode.iso_atime; 437 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 438 inop->inode.iso_mtime = inop->inode.iso_ctime; 439 } else 440 ap = NULL; 441 } 442 if (!ap) { 443 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 444 inop->inode.iso_atime = inop->inode.iso_ctime; 445 inop->inode.iso_mtime = inop->inode.iso_ctime; 446 } 447 if (bp2) 448 brelse(bp2); 449 } 450 451 int 452 cd9660_tstamp_conv7(pi,pu) 453 u_char *pi; 454 struct timespec *pu; 455 { 456 int crtime, days; 457 int y, m, d, hour, minute, second, tz; 458 459 y = pi[0] + 1900; 460 m = pi[1]; 461 d = pi[2]; 462 hour = pi[3]; 463 minute = pi[4]; 464 second = pi[5]; 465 tz = pi[6]; 466 467 if (y < 1970) { 468 pu->tv_sec = 0; 469 pu->tv_nsec = 0; 470 return 0; 471 } else { 472 #ifdef ORIGINAL 473 /* computes day number relative to Sept. 19th,1989 */ 474 /* don't even *THINK* about changing formula. It works! */ 475 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 476 #else 477 /* 478 * Changed :-) to make it relative to Jan. 1st, 1970 479 * and to disambiguate negative division 480 */ 481 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 482 #endif 483 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 484 485 /* timezone offset is unreliable on some disks */ 486 if (-48 <= tz && tz <= 52) 487 crtime -= tz * 15 * 60; 488 } 489 pu->tv_sec = crtime; 490 pu->tv_nsec = 0; 491 return 1; 492 } 493 494 static u_int 495 cd9660_chars2ui(begin,len) 496 u_char *begin; 497 int len; 498 { 499 u_int rc; 500 501 for (rc = 0; --len >= 0;) { 502 rc *= 10; 503 rc += *begin++ - '0'; 504 } 505 return rc; 506 } 507 508 int 509 cd9660_tstamp_conv17(pi,pu) 510 u_char *pi; 511 struct timespec *pu; 512 { 513 u_char buf[7]; 514 515 /* year:"0001"-"9999" -> -1900 */ 516 buf[0] = cd9660_chars2ui(pi,4) - 1900; 517 518 /* month: " 1"-"12" -> 1 - 12 */ 519 buf[1] = cd9660_chars2ui(pi + 4,2); 520 521 /* day: " 1"-"31" -> 1 - 31 */ 522 buf[2] = cd9660_chars2ui(pi + 6,2); 523 524 /* hour: " 0"-"23" -> 0 - 23 */ 525 buf[3] = cd9660_chars2ui(pi + 8,2); 526 527 /* minute:" 0"-"59" -> 0 - 59 */ 528 buf[4] = cd9660_chars2ui(pi + 10,2); 529 530 /* second:" 0"-"59" -> 0 - 59 */ 531 buf[5] = cd9660_chars2ui(pi + 12,2); 532 533 /* difference of GMT */ 534 buf[6] = pi[16]; 535 536 return cd9660_tstamp_conv7(buf,pu); 537 } 538 539 ino_t 540 isodirino(isodir, imp) 541 struct iso_directory_record *isodir; 542 struct iso_mnt *imp; 543 { 544 ino_t ino; 545 546 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 547 << imp->im_bshift; 548 return (ino); 549 } 550
Indexes created Thu Sep 25 08:09:54 GMT 2025