cd9660_node.c revision 1.18
1 /* $NetBSD: cd9660_node.c,v 1.18 2007/11/26 19:01:42 pooka 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 1.18 2007/11/26 19:01:42 pooka 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(u_char *, int); 80 81 /* 82 * Initialize hash links for inodes and dnodes. 83 */ 84 void 85 cd9660_init() 86 { 87 88 malloc_type_attach(M_ISOFSMNT); 89 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 90 "cd9660nopl", &pool_allocator_nointr, IPL_NONE); 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 malloc_type_detach(M_ISOFSMNT); 168 } 169 170 #ifdef ISODEVMAP 171 /* 172 * Enter a new node into the device hash list 173 */ 174 struct iso_dnode * 175 iso_dmap(device, inum, create) 176 dev_t device; 177 ino_t inum; 178 int create; 179 { 180 struct iso_dnode *dp; 181 struct idvhashhead *hp; 182 183 hp = &idvhashtbl[DNOHASH(device, inum)]; 184 LIST_FOREACH(dp, hp, d_hash) { 185 if (inum == dp->i_number && device == dp->i_dev) 186 return (dp); 187 } 188 189 if (!create) 190 return (NULL); 191 192 MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE, 193 M_WAITOK); 194 dp->i_dev = device; 195 dp->i_number = inum; 196 LIST_INSERT_HEAD(hp, dp, d_hash); 197 return (dp); 198 } 199 200 void 201 iso_dunmap(device) 202 dev_t device; 203 { 204 struct idvhashhead *dpp; 205 struct iso_dnode *dp, *dq; 206 207 for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) { 208 for (dp = LIST_FIRST(dpp); dp != NULL; dp = dq) { 209 dq = LIST_NEXT(dp, d_hash); 210 if (device == dp->i_dev) { 211 LIST_REMOVE(dp, d_hash); 212 FREE(dp, M_CACHE); 213 } 214 } 215 } 216 } 217 #endif 218 219 /* 220 * Use the device/inum pair to find the incore inode, and return a pointer 221 * to it. If it is in core, but locked, wait for it. 222 */ 223 struct vnode * 224 cd9660_ihashget(dev, inum) 225 dev_t dev; 226 ino_t inum; 227 { 228 struct iso_node *ip; 229 struct vnode *vp; 230 231 loop: 232 simple_lock(&cd9660_ihash_slock); 233 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 234 if (inum == ip->i_number && dev == ip->i_dev) { 235 vp = ITOV(ip); 236 simple_lock(&vp->v_interlock); 237 simple_unlock(&cd9660_ihash_slock); 238 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK)) 239 goto loop; 240 return (vp); 241 } 242 } 243 simple_unlock(&cd9660_ihash_slock); 244 return (NULL); 245 } 246 247 /* 248 * Insert the inode into the hash table, and return it locked. 249 * 250 * ip->i_vnode must be initialized first. 251 */ 252 void 253 cd9660_ihashins(ip) 254 struct iso_node *ip; 255 { 256 struct ihashhead *ipp; 257 258 simple_lock(&cd9660_ihash_slock); 259 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 260 LIST_INSERT_HEAD(ipp, ip, i_hash); 261 simple_unlock(&cd9660_ihash_slock); 262 263 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 264 } 265 266 /* 267 * Remove the inode from the hash table. 268 */ 269 void 270 cd9660_ihashrem(ip) 271 struct iso_node *ip; 272 { 273 simple_lock(&cd9660_ihash_slock); 274 LIST_REMOVE(ip, i_hash); 275 simple_unlock(&cd9660_ihash_slock); 276 } 277 278 /* 279 * Last reference to an inode, write the inode out and if necessary, 280 * truncate and deallocate the file. 281 */ 282 int 283 cd9660_inactive(v) 284 void *v; 285 { 286 struct vop_inactive_args /* { 287 struct vnode *a_vp; 288 } */ *ap = v; 289 struct vnode *vp = ap->a_vp; 290 struct iso_node *ip = VTOI(vp); 291 int error = 0; 292 293 if (prtactive && vp->v_usecount != 0) 294 vprint("cd9660_inactive: pushing active", vp); 295 296 ip->i_flag = 0; 297 VOP_UNLOCK(vp, 0); 298 /* 299 * If we are done with the inode, reclaim it 300 * so that it can be reused immediately. 301 */ 302 if (ip->inode.iso_mode == 0) 303 vrecycle(vp, (struct simplelock *)0, curlwp); 304 return error; 305 } 306 307 /* 308 * Reclaim an inode so that it can be used for other purposes. 309 */ 310 int 311 cd9660_reclaim(v) 312 void *v; 313 { 314 struct vop_reclaim_args /* { 315 struct vnode *a_vp; 316 struct lwp *a_l; 317 } */ *ap = v; 318 struct vnode *vp = ap->a_vp; 319 struct iso_node *ip = VTOI(vp); 320 321 if (prtactive && vp->v_usecount != 0) 322 vprint("cd9660_reclaim: pushing active", vp); 323 /* 324 * Remove the inode from its hash chain. 325 */ 326 cd9660_ihashrem(ip); 327 /* 328 * Purge old data structures associated with the inode. 329 */ 330 cache_purge(vp); 331 if (ip->i_devvp) { 332 vrele(ip->i_devvp); 333 ip->i_devvp = 0; 334 } 335 genfs_node_destroy(vp); 336 pool_put(&cd9660_node_pool, vp->v_data); 337 vp->v_data = NULL; 338 return (0); 339 } 340 341 /* 342 * File attributes 343 */ 344 void 345 cd9660_defattr(isodir, inop, bp) 346 struct iso_directory_record *isodir; 347 struct iso_node *inop; 348 struct buf *bp; 349 { 350 struct buf *bp2 = NULL; 351 struct iso_mnt *imp; 352 struct iso_extended_attributes *ap = NULL; 353 int off; 354 355 if (isonum_711(isodir->flags)&2) { 356 inop->inode.iso_mode = S_IFDIR; 357 /* 358 * If we return 2, fts() will assume there are no subdirectories 359 * (just links for the path and .), so instead we return 1. 360 */ 361 inop->inode.iso_links = 1; 362 } else { 363 inop->inode.iso_mode = S_IFREG; 364 inop->inode.iso_links = 1; 365 } 366 if (!bp 367 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 368 && (off = isonum_711(isodir->ext_attr_length))) { 369 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 370 NULL, &bp2); 371 bp = bp2; 372 } 373 if (bp) { 374 ap = (struct iso_extended_attributes *)bp->b_data; 375 376 if (isonum_711(ap->version) == 1) { 377 if (!(ap->perm[1]&0x10)) 378 inop->inode.iso_mode |= S_IRUSR; 379 if (!(ap->perm[1]&0x40)) 380 inop->inode.iso_mode |= S_IXUSR; 381 if (!(ap->perm[0]&0x01)) 382 inop->inode.iso_mode |= S_IRGRP; 383 if (!(ap->perm[0]&0x04)) 384 inop->inode.iso_mode |= S_IXGRP; 385 if (!(ap->perm[0]&0x10)) 386 inop->inode.iso_mode |= S_IROTH; 387 if (!(ap->perm[0]&0x40)) 388 inop->inode.iso_mode |= S_IXOTH; 389 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 390 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 391 } else 392 ap = NULL; 393 } 394 if (!ap) { 395 inop->inode.iso_mode |= 396 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 397 inop->inode.iso_uid = (uid_t)0; 398 inop->inode.iso_gid = (gid_t)0; 399 } 400 if (bp2) 401 brelse(bp2, 0); 402 } 403 404 /* 405 * Time stamps 406 */ 407 void 408 cd9660_deftstamp(isodir,inop,bp) 409 struct iso_directory_record *isodir; 410 struct iso_node *inop; 411 struct buf *bp; 412 { 413 struct buf *bp2 = NULL; 414 struct iso_mnt *imp; 415 struct iso_extended_attributes *ap = NULL; 416 int off; 417 418 if (!bp 419 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 420 && (off = isonum_711(isodir->ext_attr_length))) { 421 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 422 NULL, &bp2); 423 bp = bp2; 424 } 425 if (bp) { 426 ap = (struct iso_extended_attributes *)bp->b_data; 427 428 if (isonum_711(ap->version) == 1) { 429 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 430 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 431 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 432 inop->inode.iso_ctime = inop->inode.iso_atime; 433 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 434 inop->inode.iso_mtime = inop->inode.iso_ctime; 435 } else 436 ap = NULL; 437 } 438 if (!ap) { 439 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 440 inop->inode.iso_atime = inop->inode.iso_ctime; 441 inop->inode.iso_mtime = inop->inode.iso_ctime; 442 } 443 if (bp2) 444 brelse(bp2, 0); 445 } 446 447 int 448 cd9660_tstamp_conv7(pi,pu) 449 u_char *pi; 450 struct timespec *pu; 451 { 452 int crtime, days; 453 int y, m, d, hour, minute, second, tz; 454 455 y = pi[0] + 1900; 456 m = pi[1]; 457 d = pi[2]; 458 hour = pi[3]; 459 minute = pi[4]; 460 second = pi[5]; 461 tz = pi[6]; 462 463 if (y < 1970) { 464 pu->tv_sec = 0; 465 pu->tv_nsec = 0; 466 return 0; 467 } else { 468 #ifdef ORIGINAL 469 /* computes day number relative to Sept. 19th,1989 */ 470 /* don't even *THINK* about changing formula. It works! */ 471 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 472 #else 473 /* 474 * Changed :-) to make it relative to Jan. 1st, 1970 475 * and to disambiguate negative division 476 */ 477 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 478 #endif 479 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 480 481 /* timezone offset is unreliable on some disks */ 482 if (-48 <= tz && tz <= 52) 483 crtime -= tz * 15 * 60; 484 } 485 pu->tv_sec = crtime; 486 pu->tv_nsec = 0; 487 return 1; 488 } 489 490 static u_int 491 cd9660_chars2ui(begin,len) 492 u_char *begin; 493 int len; 494 { 495 u_int rc; 496 497 for (rc = 0; --len >= 0;) { 498 rc *= 10; 499 rc += *begin++ - '0'; 500 } 501 return rc; 502 } 503 504 int 505 cd9660_tstamp_conv17(pi,pu) 506 u_char *pi; 507 struct timespec *pu; 508 { 509 u_char tbuf[7]; 510 511 /* year:"0001"-"9999" -> -1900 */ 512 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 513 514 /* month: " 1"-"12" -> 1 - 12 */ 515 tbuf[1] = cd9660_chars2ui(pi + 4,2); 516 517 /* day: " 1"-"31" -> 1 - 31 */ 518 tbuf[2] = cd9660_chars2ui(pi + 6,2); 519 520 /* hour: " 0"-"23" -> 0 - 23 */ 521 tbuf[3] = cd9660_chars2ui(pi + 8,2); 522 523 /* minute:" 0"-"59" -> 0 - 59 */ 524 tbuf[4] = cd9660_chars2ui(pi + 10,2); 525 526 /* second:" 0"-"59" -> 0 - 59 */ 527 tbuf[5] = cd9660_chars2ui(pi + 12,2); 528 529 /* difference of GMT */ 530 tbuf[6] = pi[16]; 531 532 return cd9660_tstamp_conv7(tbuf,pu); 533 } 534 535 ino_t 536 isodirino(isodir, imp) 537 struct iso_directory_record *isodir; 538 struct iso_mnt *imp; 539 { 540 ino_t ino; 541 542 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 543 << imp->im_bshift; 544 return (ino); 545 } 546
Indexes created Thu Sep 25 16:09:42 GMT 2025