cd9660_node.c revision 1.4
1 /* $NetBSD: cd9660_node.c,v 1.4 2003/06/29 22:31:08 fvdl 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. All advertising materials mentioning features or use of this software 21 * must display the following acknowledgement: 22 * This product includes software developed by the University of 23 * California, Berkeley and its contributors. 24 * 4. Neither the name of the University nor the names of its contributors 25 * may be used to endorse or promote products derived from this software 26 * without specific prior written permission. 27 * 28 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38 * SUCH DAMAGE. 39 * 40 * @(#)cd9660_node.c 8.8 (Berkeley) 5/22/95 41 */ 42 43 #include <sys/cdefs.h> 44 __KERNEL_RCSID(0, "$NetBSD: cd9660_node.c,v 1.4 2003/06/29 22:31:08 fvdl Exp $"); 45 46 #include <sys/param.h> 47 #include <sys/systm.h> 48 #include <sys/mount.h> 49 #include <sys/proc.h> 50 #include <sys/file.h> 51 #include <sys/buf.h> 52 #include <sys/vnode.h> 53 #include <sys/namei.h> 54 #include <sys/kernel.h> 55 #include <sys/malloc.h> 56 #include <sys/pool.h> 57 #include <sys/stat.h> 58 59 #include <fs/cd9660/iso.h> 60 #include <fs/cd9660/cd9660_extern.h> 61 #include <fs/cd9660/cd9660_node.h> 62 #include <fs/cd9660/cd9660_mount.h> 63 #include <fs/cd9660/iso_rrip.h> 64 65 /* 66 * Structures associated with iso_node caching. 67 */ 68 LIST_HEAD(ihashhead, iso_node) *isohashtbl; 69 u_long isohash; 70 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash) 71 struct simplelock cd9660_ihash_slock; 72 73 #ifdef ISODEVMAP 74 LIST_HEAD(idvhashhead, iso_dnode) *idvhashtbl; 75 u_long idvhash; 76 #define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash) 77 #endif 78 79 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 80 81 struct pool cd9660_node_pool; 82 83 static u_int cd9660_chars2ui __P((u_char *, int)); 84 85 /* 86 * Initialize hash links for inodes and dnodes. 87 */ 88 void 89 cd9660_init() 90 { 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 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 99 "cd9660nopl", &pool_allocator_nointr); 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 pool_destroy(&cd9660_node_pool); 169 } 170 171 #ifdef ISODEVMAP 172 /* 173 * Enter a new node into the device hash list 174 */ 175 struct iso_dnode * 176 iso_dmap(device, inum, create) 177 dev_t device; 178 ino_t inum; 179 int create; 180 { 181 struct iso_dnode *dp; 182 struct idvhashhead *hp; 183 184 hp = &idvhashtbl[DNOHASH(device, inum)]; 185 LIST_FOREACH(dp, hp, d_hash) { 186 if (inum == dp->i_number && device == dp->i_dev) 187 return (dp); 188 } 189 190 if (!create) 191 return (NULL); 192 193 MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE, 194 M_WAITOK); 195 dp->i_dev = device; 196 dp->i_number = inum; 197 LIST_INSERT_HEAD(hp, dp, d_hash); 198 return (dp); 199 } 200 201 void 202 iso_dunmap(device) 203 dev_t device; 204 { 205 struct idvhashhead *dpp; 206 struct iso_dnode *dp, *dq; 207 208 for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) { 209 for (dp = LIST_FIRST(dpp); dp != NULL; dp = dq) { 210 dq = LIST_NEXT(dp, d_hash); 211 if (device == dp->i_dev) { 212 LIST_REMOVE(dp, d_hash); 213 FREE(dp, M_CACHE); 214 } 215 } 216 } 217 } 218 #endif 219 220 /* 221 * Use the device/inum pair to find the incore inode, and return a pointer 222 * to it. If it is in core, but locked, wait for it. 223 */ 224 struct vnode * 225 cd9660_ihashget(dev, inum) 226 dev_t dev; 227 ino_t inum; 228 { 229 struct iso_node *ip; 230 struct vnode *vp; 231 232 loop: 233 simple_lock(&cd9660_ihash_slock); 234 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 235 if (inum == ip->i_number && dev == ip->i_dev) { 236 vp = ITOV(ip); 237 simple_lock(&vp->v_interlock); 238 simple_unlock(&cd9660_ihash_slock); 239 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 240 goto loop; 241 return (vp); 242 } 243 } 244 simple_unlock(&cd9660_ihash_slock); 245 return (NULL); 246 } 247 248 /* 249 * Insert the inode into the hash table, and return it locked. 250 * 251 * ip->i_vnode must be initialized first. 252 */ 253 void 254 cd9660_ihashins(ip) 255 struct iso_node *ip; 256 { 257 struct ihashhead *ipp; 258 259 simple_lock(&cd9660_ihash_slock); 260 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 261 LIST_INSERT_HEAD(ipp, ip, i_hash); 262 simple_unlock(&cd9660_ihash_slock); 263 264 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 265 } 266 267 /* 268 * Remove the inode from the hash table. 269 */ 270 void 271 cd9660_ihashrem(ip) 272 struct iso_node *ip; 273 { 274 simple_lock(&cd9660_ihash_slock); 275 LIST_REMOVE(ip, i_hash); 276 simple_unlock(&cd9660_ihash_slock); 277 } 278 279 /* 280 * Last reference to an inode, write the inode out and if necessary, 281 * truncate and deallocate the file. 282 */ 283 int 284 cd9660_inactive(v) 285 void *v; 286 { 287 struct vop_inactive_args /* { 288 struct vnode *a_vp; 289 struct proc *a_p; 290 } */ *ap = v; 291 struct vnode *vp = ap->a_vp; 292 struct proc *p = ap->a_p; 293 struct iso_node *ip = VTOI(vp); 294 int error = 0; 295 296 if (prtactive && vp->v_usecount != 0) 297 vprint("cd9660_inactive: pushing active", vp); 298 299 ip->i_flag = 0; 300 VOP_UNLOCK(vp, 0); 301 /* 302 * If we are done with the inode, reclaim it 303 * so that it can be reused immediately. 304 */ 305 if (ip->inode.iso_mode == 0) 306 vrecycle(vp, (struct simplelock *)0, p); 307 return error; 308 } 309 310 /* 311 * Reclaim an inode so that it can be used for other purposes. 312 */ 313 int 314 cd9660_reclaim(v) 315 void *v; 316 { 317 struct vop_reclaim_args /* { 318 struct vnode *a_vp; 319 struct proc *a_p; 320 } */ *ap = v; 321 struct vnode *vp = ap->a_vp; 322 struct iso_node *ip = VTOI(vp); 323 324 if (prtactive && vp->v_usecount != 0) 325 vprint("cd9660_reclaim: pushing active", vp); 326 /* 327 * Remove the inode from its hash chain. 328 */ 329 cd9660_ihashrem(ip); 330 /* 331 * Purge old data structures associated with the inode. 332 */ 333 cache_purge(vp); 334 if (ip->i_devvp) { 335 vrele(ip->i_devvp); 336 ip->i_devvp = 0; 337 } 338 pool_put(&cd9660_node_pool, vp->v_data); 339 vp->v_data = NULL; 340 return (0); 341 } 342 343 /* 344 * File attributes 345 */ 346 void 347 cd9660_defattr(isodir, inop, bp) 348 struct iso_directory_record *isodir; 349 struct iso_node *inop; 350 struct buf *bp; 351 { 352 struct buf *bp2 = NULL; 353 struct iso_mnt *imp; 354 struct iso_extended_attributes *ap = NULL; 355 int off; 356 357 if (isonum_711(isodir->flags)&2) { 358 inop->inode.iso_mode = S_IFDIR; 359 /* 360 * If we return 2, fts() will assume there are no subdirectories 361 * (just links for the path and .), so instead we return 1. 362 */ 363 inop->inode.iso_links = 1; 364 } else { 365 inop->inode.iso_mode = S_IFREG; 366 inop->inode.iso_links = 1; 367 } 368 if (!bp 369 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 370 && (off = isonum_711(isodir->ext_attr_length))) { 371 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 372 &bp2); 373 bp = bp2; 374 } 375 if (bp) { 376 ap = (struct iso_extended_attributes *)bp->b_data; 377 378 if (isonum_711(ap->version) == 1) { 379 if (!(ap->perm[1]&0x10)) 380 inop->inode.iso_mode |= S_IRUSR; 381 if (!(ap->perm[1]&0x40)) 382 inop->inode.iso_mode |= S_IXUSR; 383 if (!(ap->perm[0]&0x01)) 384 inop->inode.iso_mode |= S_IRGRP; 385 if (!(ap->perm[0]&0x04)) 386 inop->inode.iso_mode |= S_IXGRP; 387 if (!(ap->perm[0]&0x10)) 388 inop->inode.iso_mode |= S_IROTH; 389 if (!(ap->perm[0]&0x40)) 390 inop->inode.iso_mode |= S_IXOTH; 391 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 392 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 393 } else 394 ap = NULL; 395 } 396 if (!ap) { 397 inop->inode.iso_mode |= 398 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 399 inop->inode.iso_uid = (uid_t)0; 400 inop->inode.iso_gid = (gid_t)0; 401 } 402 if (bp2) 403 brelse(bp2); 404 } 405 406 /* 407 * Time stamps 408 */ 409 void 410 cd9660_deftstamp(isodir,inop,bp) 411 struct iso_directory_record *isodir; 412 struct iso_node *inop; 413 struct buf *bp; 414 { 415 struct buf *bp2 = NULL; 416 struct iso_mnt *imp; 417 struct iso_extended_attributes *ap = NULL; 418 int off; 419 420 if (!bp 421 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 422 && (off = isonum_711(isodir->ext_attr_length))) { 423 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 424 &bp2); 425 bp = bp2; 426 } 427 if (bp) { 428 ap = (struct iso_extended_attributes *)bp->b_data; 429 430 if (isonum_711(ap->version) == 1) { 431 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 432 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 433 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 434 inop->inode.iso_ctime = inop->inode.iso_atime; 435 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 436 inop->inode.iso_mtime = inop->inode.iso_ctime; 437 } else 438 ap = NULL; 439 } 440 if (!ap) { 441 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 442 inop->inode.iso_atime = inop->inode.iso_ctime; 443 inop->inode.iso_mtime = inop->inode.iso_ctime; 444 } 445 if (bp2) 446 brelse(bp2); 447 } 448 449 int 450 cd9660_tstamp_conv7(pi,pu) 451 u_char *pi; 452 struct timespec *pu; 453 { 454 int crtime, days; 455 int y, m, d, hour, minute, second, tz; 456 457 y = pi[0] + 1900; 458 m = pi[1]; 459 d = pi[2]; 460 hour = pi[3]; 461 minute = pi[4]; 462 second = pi[5]; 463 tz = pi[6]; 464 465 if (y < 1970) { 466 pu->tv_sec = 0; 467 pu->tv_nsec = 0; 468 return 0; 469 } else { 470 #ifdef ORIGINAL 471 /* computes day number relative to Sept. 19th,1989 */ 472 /* don't even *THINK* about changing formula. It works! */ 473 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 474 #else 475 /* 476 * Changed :-) to make it relative to Jan. 1st, 1970 477 * and to disambiguate negative division 478 */ 479 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 480 #endif 481 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 482 483 /* timezone offset is unreliable on some disks */ 484 if (-48 <= tz && tz <= 52) 485 crtime -= tz * 15 * 60; 486 } 487 pu->tv_sec = crtime; 488 pu->tv_nsec = 0; 489 return 1; 490 } 491 492 static u_int 493 cd9660_chars2ui(begin,len) 494 u_char *begin; 495 int len; 496 { 497 u_int rc; 498 499 for (rc = 0; --len >= 0;) { 500 rc *= 10; 501 rc += *begin++ - '0'; 502 } 503 return rc; 504 } 505 506 int 507 cd9660_tstamp_conv17(pi,pu) 508 u_char *pi; 509 struct timespec *pu; 510 { 511 u_char buf[7]; 512 513 /* year:"0001"-"9999" -> -1900 */ 514 buf[0] = cd9660_chars2ui(pi,4) - 1900; 515 516 /* month: " 1"-"12" -> 1 - 12 */ 517 buf[1] = cd9660_chars2ui(pi + 4,2); 518 519 /* day: " 1"-"31" -> 1 - 31 */ 520 buf[2] = cd9660_chars2ui(pi + 6,2); 521 522 /* hour: " 0"-"23" -> 0 - 23 */ 523 buf[3] = cd9660_chars2ui(pi + 8,2); 524 525 /* minute:" 0"-"59" -> 0 - 59 */ 526 buf[4] = cd9660_chars2ui(pi + 10,2); 527 528 /* second:" 0"-"59" -> 0 - 59 */ 529 buf[5] = cd9660_chars2ui(pi + 12,2); 530 531 /* difference of GMT */ 532 buf[6] = pi[16]; 533 534 return cd9660_tstamp_conv7(buf,pu); 535 } 536 537 ino_t 538 isodirino(isodir, imp) 539 struct iso_directory_record *isodir; 540 struct iso_mnt *imp; 541 { 542 ino_t ino; 543 544 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 545 << imp->im_bshift; 546 return (ino); 547 } 548
Indexes created Tue Sep 23 07:09:52 GMT 2025