cd9660_node.c revision 1.20
1 /* $NetBSD: cd9660_node.c,v 1.20 2008/01/02 11:48:40 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 1.20 2008/01/02 11:48:40 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 kmutex_t cd9660_ihash_lock; 68 kmutex_t cd9660_hashlock; 69 70 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 71 72 struct pool cd9660_node_pool; 73 74 static u_int cd9660_chars2ui(u_char *, int); 75 76 /* 77 * Initialize hash links for inodes and dnodes. 78 */ 79 void 80 cd9660_init() 81 { 82 83 malloc_type_attach(M_ISOFSMNT); 84 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 85 "cd9660nopl", &pool_allocator_nointr, IPL_NONE); 86 isohashtbl = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 87 &isohash); 88 mutex_init(&cd9660_ihash_lock, MUTEX_DEFAULT, IPL_NONE); 89 mutex_init(&cd9660_hashlock, MUTEX_DEFAULT, IPL_NONE); 90 } 91 92 /* 93 * Reinitialize inode hash table. 94 */ 95 96 void 97 cd9660_reinit() 98 { 99 struct iso_node *ip; 100 struct ihashhead *oldhash1, *hash1; 101 u_long oldmask1, mask1, val; 102 u_int i; 103 104 hash1 = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 105 &mask1); 106 107 mutex_enter(&cd9660_ihash_lock); 108 oldhash1 = isohashtbl; 109 oldmask1 = isohash; 110 isohashtbl = hash1; 111 isohash = mask1; 112 for (i = 0; i <= oldmask1; i++) { 113 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) { 114 LIST_REMOVE(ip, i_hash); 115 val = INOHASH(ip->i_dev, ip->i_number); 116 LIST_INSERT_HEAD(&hash1[val], ip, i_hash); 117 } 118 } 119 mutex_exit(&cd9660_ihash_lock); 120 hashdone(oldhash1, M_ISOFSMNT); 121 } 122 123 /* 124 * Destroy node pool and hash table. 125 */ 126 void 127 cd9660_done() 128 { 129 hashdone(isohashtbl, M_ISOFSMNT); 130 pool_destroy(&cd9660_node_pool); 131 mutex_destroy(&cd9660_ihash_lock); 132 mutex_destroy(&cd9660_hashlock); 133 malloc_type_detach(M_ISOFSMNT); 134 } 135 136 /* 137 * Use the device/inum pair to find the incore inode, and return a pointer 138 * to it. If it is in core, but locked, wait for it. 139 */ 140 struct vnode * 141 cd9660_ihashget(dev, inum, flags) 142 dev_t dev; 143 ino_t inum; 144 int flags; 145 { 146 struct iso_node *ip; 147 struct vnode *vp; 148 149 loop: 150 mutex_enter(&cd9660_ihash_lock); 151 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 152 if (inum == ip->i_number && dev == ip->i_dev) { 153 vp = ITOV(ip); 154 if (flags == 0) { 155 mutex_exit(&cd9660_ihash_lock); 156 } else { 157 mutex_enter(&vp->v_interlock); 158 mutex_exit(&cd9660_ihash_lock); 159 if (vget(vp, flags | LK_INTERLOCK)) 160 goto loop; 161 } 162 return (vp); 163 } 164 } 165 mutex_exit(&cd9660_ihash_lock); 166 return (NULL); 167 } 168 169 /* 170 * Insert the inode into the hash table, and return it locked. 171 * 172 * ip->i_vnode must be initialized first. 173 */ 174 void 175 cd9660_ihashins(ip) 176 struct iso_node *ip; 177 { 178 struct ihashhead *ipp; 179 180 KASSERT(mutex_owned(&cd9660_hashlock)); 181 182 mutex_enter(&cd9660_ihash_lock); 183 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 184 LIST_INSERT_HEAD(ipp, ip, i_hash); 185 mutex_exit(&cd9660_ihash_lock); 186 187 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 188 } 189 190 /* 191 * Remove the inode from the hash table. 192 */ 193 void 194 cd9660_ihashrem(ip) 195 struct iso_node *ip; 196 { 197 mutex_enter(&cd9660_ihash_lock); 198 LIST_REMOVE(ip, i_hash); 199 mutex_exit(&cd9660_ihash_lock); 200 } 201 202 /* 203 * Last reference to an inode, write the inode out and if necessary, 204 * truncate and deallocate the file. 205 */ 206 int 207 cd9660_inactive(v) 208 void *v; 209 { 210 struct vop_inactive_args /* { 211 struct vnode *a_vp; 212 bool *a_recycle; 213 } */ *ap = v; 214 struct vnode *vp = ap->a_vp; 215 struct iso_node *ip = VTOI(vp); 216 int error = 0; 217 218 if (prtactive && vp->v_usecount != 0) 219 vprint("cd9660_inactive: pushing active", vp); 220 221 /* 222 * If we are done with the inode, reclaim it 223 * so that it can be reused immediately. 224 */ 225 ip->i_flag = 0; 226 *ap->a_recycle = (ip->inode.iso_mode == 0); 227 VOP_UNLOCK(vp, 0); 228 return error; 229 } 230 231 /* 232 * Reclaim an inode so that it can be used for other purposes. 233 */ 234 int 235 cd9660_reclaim(v) 236 void *v; 237 { 238 struct vop_reclaim_args /* { 239 struct vnode *a_vp; 240 struct lwp *a_l; 241 } */ *ap = v; 242 struct vnode *vp = ap->a_vp; 243 struct iso_node *ip = VTOI(vp); 244 245 if (prtactive && vp->v_usecount != 0) 246 vprint("cd9660_reclaim: pushing active", vp); 247 /* 248 * Remove the inode from its hash chain. 249 */ 250 cd9660_ihashrem(ip); 251 /* 252 * Purge old data structures associated with the inode. 253 */ 254 cache_purge(vp); 255 if (ip->i_devvp) { 256 vrele(ip->i_devvp); 257 ip->i_devvp = 0; 258 } 259 genfs_node_destroy(vp); 260 pool_put(&cd9660_node_pool, vp->v_data); 261 vp->v_data = NULL; 262 return (0); 263 } 264 265 /* 266 * File attributes 267 */ 268 void 269 cd9660_defattr(isodir, inop, bp) 270 struct iso_directory_record *isodir; 271 struct iso_node *inop; 272 struct buf *bp; 273 { 274 struct buf *bp2 = NULL; 275 struct iso_mnt *imp; 276 struct iso_extended_attributes *ap = NULL; 277 int off; 278 279 if (isonum_711(isodir->flags)&2) { 280 inop->inode.iso_mode = S_IFDIR; 281 /* 282 * If we return 2, fts() will assume there are no subdirectories 283 * (just links for the path and .), so instead we return 1. 284 */ 285 inop->inode.iso_links = 1; 286 } else { 287 inop->inode.iso_mode = S_IFREG; 288 inop->inode.iso_links = 1; 289 } 290 if (!bp 291 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 292 && (off = isonum_711(isodir->ext_attr_length))) { 293 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 294 NULL, &bp2); 295 bp = bp2; 296 } 297 if (bp) { 298 ap = (struct iso_extended_attributes *)bp->b_data; 299 300 if (isonum_711(ap->version) == 1) { 301 if (!(ap->perm[1]&0x10)) 302 inop->inode.iso_mode |= S_IRUSR; 303 if (!(ap->perm[1]&0x40)) 304 inop->inode.iso_mode |= S_IXUSR; 305 if (!(ap->perm[0]&0x01)) 306 inop->inode.iso_mode |= S_IRGRP; 307 if (!(ap->perm[0]&0x04)) 308 inop->inode.iso_mode |= S_IXGRP; 309 if (!(ap->perm[0]&0x10)) 310 inop->inode.iso_mode |= S_IROTH; 311 if (!(ap->perm[0]&0x40)) 312 inop->inode.iso_mode |= S_IXOTH; 313 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 314 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 315 } else 316 ap = NULL; 317 } 318 if (!ap) { 319 inop->inode.iso_mode |= 320 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 321 inop->inode.iso_uid = (uid_t)0; 322 inop->inode.iso_gid = (gid_t)0; 323 } 324 if (bp2) 325 brelse(bp2, 0); 326 } 327 328 /* 329 * Time stamps 330 */ 331 void 332 cd9660_deftstamp(isodir,inop,bp) 333 struct iso_directory_record *isodir; 334 struct iso_node *inop; 335 struct buf *bp; 336 { 337 struct buf *bp2 = NULL; 338 struct iso_mnt *imp; 339 struct iso_extended_attributes *ap = NULL; 340 int off; 341 342 if (!bp 343 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 344 && (off = isonum_711(isodir->ext_attr_length))) { 345 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 346 NULL, &bp2); 347 bp = bp2; 348 } 349 if (bp) { 350 ap = (struct iso_extended_attributes *)bp->b_data; 351 352 if (isonum_711(ap->version) == 1) { 353 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 354 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 355 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 356 inop->inode.iso_ctime = inop->inode.iso_atime; 357 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 358 inop->inode.iso_mtime = inop->inode.iso_ctime; 359 } else 360 ap = NULL; 361 } 362 if (!ap) { 363 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 364 inop->inode.iso_atime = inop->inode.iso_ctime; 365 inop->inode.iso_mtime = inop->inode.iso_ctime; 366 } 367 if (bp2) 368 brelse(bp2, 0); 369 } 370 371 int 372 cd9660_tstamp_conv7(pi,pu) 373 u_char *pi; 374 struct timespec *pu; 375 { 376 int crtime, days; 377 int y, m, d, hour, minute, second, tz; 378 379 y = pi[0] + 1900; 380 m = pi[1]; 381 d = pi[2]; 382 hour = pi[3]; 383 minute = pi[4]; 384 second = pi[5]; 385 tz = pi[6]; 386 387 if (y < 1970) { 388 pu->tv_sec = 0; 389 pu->tv_nsec = 0; 390 return 0; 391 } else { 392 #ifdef ORIGINAL 393 /* computes day number relative to Sept. 19th,1989 */ 394 /* don't even *THINK* about changing formula. It works! */ 395 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 396 #else 397 /* 398 * Changed :-) to make it relative to Jan. 1st, 1970 399 * and to disambiguate negative division 400 */ 401 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 402 #endif 403 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 404 405 /* timezone offset is unreliable on some disks */ 406 if (-48 <= tz && tz <= 52) 407 crtime -= tz * 15 * 60; 408 } 409 pu->tv_sec = crtime; 410 pu->tv_nsec = 0; 411 return 1; 412 } 413 414 static u_int 415 cd9660_chars2ui(begin,len) 416 u_char *begin; 417 int len; 418 { 419 u_int rc; 420 421 for (rc = 0; --len >= 0;) { 422 rc *= 10; 423 rc += *begin++ - '0'; 424 } 425 return rc; 426 } 427 428 int 429 cd9660_tstamp_conv17(pi,pu) 430 u_char *pi; 431 struct timespec *pu; 432 { 433 u_char tbuf[7]; 434 435 /* year:"0001"-"9999" -> -1900 */ 436 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 437 438 /* month: " 1"-"12" -> 1 - 12 */ 439 tbuf[1] = cd9660_chars2ui(pi + 4,2); 440 441 /* day: " 1"-"31" -> 1 - 31 */ 442 tbuf[2] = cd9660_chars2ui(pi + 6,2); 443 444 /* hour: " 0"-"23" -> 0 - 23 */ 445 tbuf[3] = cd9660_chars2ui(pi + 8,2); 446 447 /* minute:" 0"-"59" -> 0 - 59 */ 448 tbuf[4] = cd9660_chars2ui(pi + 10,2); 449 450 /* second:" 0"-"59" -> 0 - 59 */ 451 tbuf[5] = cd9660_chars2ui(pi + 12,2); 452 453 /* difference of GMT */ 454 tbuf[6] = pi[16]; 455 456 return cd9660_tstamp_conv7(tbuf,pu); 457 } 458 459 ino_t 460 isodirino(isodir, imp) 461 struct iso_directory_record *isodir; 462 struct iso_mnt *imp; 463 { 464 ino_t ino; 465 466 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 467 << imp->im_bshift; 468 return (ino); 469 } 470
Indexes created Thu Sep 25 16:09:42 GMT 2025