cd9660_node.c revision 1.7
1 /* $NetBSD: cd9660_node.c,v 1.7 2004/04/25 16:42:40 simonb 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 1.7 2004/04/25 16:42:40 simonb 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 __P((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 #endif 91 isohashtbl = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 92 &isohash); 93 simple_lock_init(&cd9660_ihash_slock); 94 #ifdef ISODEVMAP 95 idvhashtbl = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT, 96 M_WAITOK, &idvhash); 97 #endif 98 } 99 100 /* 101 * Reinitialize inode hash table. 102 */ 103 104 void 105 cd9660_reinit() 106 { 107 struct iso_node *ip; 108 struct ihashhead *oldhash1, *hash1; 109 u_long oldmask1, mask1, val; 110 #ifdef ISODEVMAP 111 struct iso_dnode *dp; 112 struct idvhashhead *oldhash2, *hash2; 113 u_long oldmask2, mask2; 114 #endif 115 u_int i; 116 117 hash1 = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 118 &mask1); 119 #ifdef ISODEVMAP 120 hash2 = hashinit(desiredvnodes / 8, HASH_LIST, M_ISOFSMNT, M_WAITOK, 121 &mask2); 122 #endif 123 124 simple_lock(&cd9660_ihash_slock); 125 oldhash1 = isohashtbl; 126 oldmask1 = isohash; 127 isohashtbl = hash1; 128 isohash = mask1; 129 #ifdef ISODEVMAP 130 oldhash2 = idvhashtbl; 131 oldmask2 = idvhash; 132 idvhashtbl = hash2; 133 idvhash = mask2; 134 for (i = 0; i <= oldmask2; i++) { 135 while ((dp = LIST_FIRST(&oldhash2[i])) != NULL) { 136 LIST_REMOVE(dp, d_hash); 137 val = DNOHASH(dp->i_dev, dp->i_number); 138 LIST_INSERT_HEAD(&hash2[val], dp, d_hash); 139 } 140 } 141 #endif 142 for (i = 0; i <= oldmask1; i++) { 143 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) { 144 LIST_REMOVE(ip, i_hash); 145 val = INOHASH(ip->i_dev, ip->i_number); 146 LIST_INSERT_HEAD(&hash1[val], ip, i_hash); 147 } 148 } 149 simple_unlock(&cd9660_ihash_slock); 150 hashdone(oldhash1, M_ISOFSMNT); 151 #ifdef ISODEVMAP 152 hashdone(oldhash2, M_ISOFSMNT); 153 #endif 154 } 155 156 /* 157 * Destroy node pool and hash table. 158 */ 159 void 160 cd9660_done() 161 { 162 hashdone(isohashtbl, M_ISOFSMNT); 163 #ifdef ISODEVMAP 164 hashdone(idvhashtbl, M_ISOFSMNT); 165 #endif 166 pool_destroy(&cd9660_node_pool); 167 #ifdef _LKM 168 malloc_type_detach(M_ISOFSMNT); 169 #endif 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) 227 dev_t dev; 228 ino_t inum; 229 { 230 struct iso_node *ip; 231 struct vnode *vp; 232 233 loop: 234 simple_lock(&cd9660_ihash_slock); 235 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 236 if (inum == ip->i_number && dev == ip->i_dev) { 237 vp = ITOV(ip); 238 simple_lock(&vp->v_interlock); 239 simple_unlock(&cd9660_ihash_slock); 240 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 241 goto loop; 242 return (vp); 243 } 244 } 245 simple_unlock(&cd9660_ihash_slock); 246 return (NULL); 247 } 248 249 /* 250 * Insert the inode into the hash table, and return it locked. 251 * 252 * ip->i_vnode must be initialized first. 253 */ 254 void 255 cd9660_ihashins(ip) 256 struct iso_node *ip; 257 { 258 struct ihashhead *ipp; 259 260 simple_lock(&cd9660_ihash_slock); 261 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 262 LIST_INSERT_HEAD(ipp, ip, i_hash); 263 simple_unlock(&cd9660_ihash_slock); 264 265 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 266 } 267 268 /* 269 * Remove the inode from the hash table. 270 */ 271 void 272 cd9660_ihashrem(ip) 273 struct iso_node *ip; 274 { 275 simple_lock(&cd9660_ihash_slock); 276 LIST_REMOVE(ip, i_hash); 277 simple_unlock(&cd9660_ihash_slock); 278 } 279 280 /* 281 * Last reference to an inode, write the inode out and if necessary, 282 * truncate and deallocate the file. 283 */ 284 int 285 cd9660_inactive(v) 286 void *v; 287 { 288 struct vop_inactive_args /* { 289 struct vnode *a_vp; 290 struct proc *a_p; 291 } */ *ap = v; 292 struct vnode *vp = ap->a_vp; 293 struct proc *p = ap->a_p; 294 struct iso_node *ip = VTOI(vp); 295 int error = 0; 296 297 if (prtactive && vp->v_usecount != 0) 298 vprint("cd9660_inactive: pushing active", vp); 299 300 ip->i_flag = 0; 301 VOP_UNLOCK(vp, 0); 302 /* 303 * If we are done with the inode, reclaim it 304 * so that it can be reused immediately. 305 */ 306 if (ip->inode.iso_mode == 0) 307 vrecycle(vp, (struct simplelock *)0, p); 308 return error; 309 } 310 311 /* 312 * Reclaim an inode so that it can be used for other purposes. 313 */ 314 int 315 cd9660_reclaim(v) 316 void *v; 317 { 318 struct vop_reclaim_args /* { 319 struct vnode *a_vp; 320 struct proc *a_p; 321 } */ *ap = v; 322 struct vnode *vp = ap->a_vp; 323 struct iso_node *ip = VTOI(vp); 324 325 if (prtactive && vp->v_usecount != 0) 326 vprint("cd9660_reclaim: pushing active", vp); 327 /* 328 * Remove the inode from its hash chain. 329 */ 330 cd9660_ihashrem(ip); 331 /* 332 * Purge old data structures associated with the inode. 333 */ 334 cache_purge(vp); 335 if (ip->i_devvp) { 336 vrele(ip->i_devvp); 337 ip->i_devvp = 0; 338 } 339 pool_put(&cd9660_node_pool, vp->v_data); 340 vp->v_data = NULL; 341 return (0); 342 } 343 344 /* 345 * File attributes 346 */ 347 void 348 cd9660_defattr(isodir, inop, bp) 349 struct iso_directory_record *isodir; 350 struct iso_node *inop; 351 struct buf *bp; 352 { 353 struct buf *bp2 = NULL; 354 struct iso_mnt *imp; 355 struct iso_extended_attributes *ap = NULL; 356 int off; 357 358 if (isonum_711(isodir->flags)&2) { 359 inop->inode.iso_mode = S_IFDIR; 360 /* 361 * If we return 2, fts() will assume there are no subdirectories 362 * (just links for the path and .), so instead we return 1. 363 */ 364 inop->inode.iso_links = 1; 365 } else { 366 inop->inode.iso_mode = S_IFREG; 367 inop->inode.iso_links = 1; 368 } 369 if (!bp 370 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 371 && (off = isonum_711(isodir->ext_attr_length))) { 372 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 373 &bp2); 374 bp = bp2; 375 } 376 if (bp) { 377 ap = (struct iso_extended_attributes *)bp->b_data; 378 379 if (isonum_711(ap->version) == 1) { 380 if (!(ap->perm[1]&0x10)) 381 inop->inode.iso_mode |= S_IRUSR; 382 if (!(ap->perm[1]&0x40)) 383 inop->inode.iso_mode |= S_IXUSR; 384 if (!(ap->perm[0]&0x01)) 385 inop->inode.iso_mode |= S_IRGRP; 386 if (!(ap->perm[0]&0x04)) 387 inop->inode.iso_mode |= S_IXGRP; 388 if (!(ap->perm[0]&0x10)) 389 inop->inode.iso_mode |= S_IROTH; 390 if (!(ap->perm[0]&0x40)) 391 inop->inode.iso_mode |= S_IXOTH; 392 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 393 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 394 } else 395 ap = NULL; 396 } 397 if (!ap) { 398 inop->inode.iso_mode |= 399 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 400 inop->inode.iso_uid = (uid_t)0; 401 inop->inode.iso_gid = (gid_t)0; 402 } 403 if (bp2) 404 brelse(bp2); 405 } 406 407 /* 408 * Time stamps 409 */ 410 void 411 cd9660_deftstamp(isodir,inop,bp) 412 struct iso_directory_record *isodir; 413 struct iso_node *inop; 414 struct buf *bp; 415 { 416 struct buf *bp2 = NULL; 417 struct iso_mnt *imp; 418 struct iso_extended_attributes *ap = NULL; 419 int off; 420 421 if (!bp 422 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 423 && (off = isonum_711(isodir->ext_attr_length))) { 424 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 425 &bp2); 426 bp = bp2; 427 } 428 if (bp) { 429 ap = (struct iso_extended_attributes *)bp->b_data; 430 431 if (isonum_711(ap->version) == 1) { 432 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 433 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 434 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 435 inop->inode.iso_ctime = inop->inode.iso_atime; 436 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 437 inop->inode.iso_mtime = inop->inode.iso_ctime; 438 } else 439 ap = NULL; 440 } 441 if (!ap) { 442 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 443 inop->inode.iso_atime = inop->inode.iso_ctime; 444 inop->inode.iso_mtime = inop->inode.iso_ctime; 445 } 446 if (bp2) 447 brelse(bp2); 448 } 449 450 int 451 cd9660_tstamp_conv7(pi,pu) 452 u_char *pi; 453 struct timespec *pu; 454 { 455 int crtime, days; 456 int y, m, d, hour, minute, second, tz; 457 458 y = pi[0] + 1900; 459 m = pi[1]; 460 d = pi[2]; 461 hour = pi[3]; 462 minute = pi[4]; 463 second = pi[5]; 464 tz = pi[6]; 465 466 if (y < 1970) { 467 pu->tv_sec = 0; 468 pu->tv_nsec = 0; 469 return 0; 470 } else { 471 #ifdef ORIGINAL 472 /* computes day number relative to Sept. 19th,1989 */ 473 /* don't even *THINK* about changing formula. It works! */ 474 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 475 #else 476 /* 477 * Changed :-) to make it relative to Jan. 1st, 1970 478 * and to disambiguate negative division 479 */ 480 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 481 #endif 482 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 483 484 /* timezone offset is unreliable on some disks */ 485 if (-48 <= tz && tz <= 52) 486 crtime -= tz * 15 * 60; 487 } 488 pu->tv_sec = crtime; 489 pu->tv_nsec = 0; 490 return 1; 491 } 492 493 static u_int 494 cd9660_chars2ui(begin,len) 495 u_char *begin; 496 int len; 497 { 498 u_int rc; 499 500 for (rc = 0; --len >= 0;) { 501 rc *= 10; 502 rc += *begin++ - '0'; 503 } 504 return rc; 505 } 506 507 int 508 cd9660_tstamp_conv17(pi,pu) 509 u_char *pi; 510 struct timespec *pu; 511 { 512 u_char buf[7]; 513 514 /* year:"0001"-"9999" -> -1900 */ 515 buf[0] = cd9660_chars2ui(pi,4) - 1900; 516 517 /* month: " 1"-"12" -> 1 - 12 */ 518 buf[1] = cd9660_chars2ui(pi + 4,2); 519 520 /* day: " 1"-"31" -> 1 - 31 */ 521 buf[2] = cd9660_chars2ui(pi + 6,2); 522 523 /* hour: " 0"-"23" -> 0 - 23 */ 524 buf[3] = cd9660_chars2ui(pi + 8,2); 525 526 /* minute:" 0"-"59" -> 0 - 59 */ 527 buf[4] = cd9660_chars2ui(pi + 10,2); 528 529 /* second:" 0"-"59" -> 0 - 59 */ 530 buf[5] = cd9660_chars2ui(pi + 12,2); 531 532 /* difference of GMT */ 533 buf[6] = pi[16]; 534 535 return cd9660_tstamp_conv7(buf,pu); 536 } 537 538 ino_t 539 isodirino(isodir, imp) 540 struct iso_directory_record *isodir; 541 struct iso_mnt *imp; 542 { 543 ino_t ino; 544 545 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 546 << imp->im_bshift; 547 return (ino); 548 } 549
Indexes created Wed Sep 24 05:09:52 GMT 2025