cd9660_node.c revision 1.21
1 /* $NetBSD: cd9660_node.c,v 1.21 2008/01/17 10:39:14 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 1.21 2008/01/17 10:39:14 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 /* 219 * If we are done with the inode, reclaim it 220 * so that it can be reused immediately. 221 */ 222 ip->i_flag = 0; 223 *ap->a_recycle = (ip->inode.iso_mode == 0); 224 VOP_UNLOCK(vp, 0); 225 return error; 226 } 227 228 /* 229 * Reclaim an inode so that it can be used for other purposes. 230 */ 231 int 232 cd9660_reclaim(v) 233 void *v; 234 { 235 struct vop_reclaim_args /* { 236 struct vnode *a_vp; 237 struct lwp *a_l; 238 } */ *ap = v; 239 struct vnode *vp = ap->a_vp; 240 struct iso_node *ip = VTOI(vp); 241 242 if (prtactive && vp->v_usecount > 1) 243 vprint("cd9660_reclaim: pushing active", vp); 244 /* 245 * Remove the inode from its hash chain. 246 */ 247 cd9660_ihashrem(ip); 248 /* 249 * Purge old data structures associated with the inode. 250 */ 251 cache_purge(vp); 252 if (ip->i_devvp) { 253 vrele(ip->i_devvp); 254 ip->i_devvp = 0; 255 } 256 genfs_node_destroy(vp); 257 pool_put(&cd9660_node_pool, vp->v_data); 258 vp->v_data = NULL; 259 return (0); 260 } 261 262 /* 263 * File attributes 264 */ 265 void 266 cd9660_defattr(isodir, inop, bp) 267 struct iso_directory_record *isodir; 268 struct iso_node *inop; 269 struct buf *bp; 270 { 271 struct buf *bp2 = NULL; 272 struct iso_mnt *imp; 273 struct iso_extended_attributes *ap = NULL; 274 int off; 275 276 if (isonum_711(isodir->flags)&2) { 277 inop->inode.iso_mode = S_IFDIR; 278 /* 279 * If we return 2, fts() will assume there are no subdirectories 280 * (just links for the path and .), so instead we return 1. 281 */ 282 inop->inode.iso_links = 1; 283 } else { 284 inop->inode.iso_mode = S_IFREG; 285 inop->inode.iso_links = 1; 286 } 287 if (!bp 288 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 289 && (off = isonum_711(isodir->ext_attr_length))) { 290 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 291 NULL, &bp2); 292 bp = bp2; 293 } 294 if (bp) { 295 ap = (struct iso_extended_attributes *)bp->b_data; 296 297 if (isonum_711(ap->version) == 1) { 298 if (!(ap->perm[1]&0x10)) 299 inop->inode.iso_mode |= S_IRUSR; 300 if (!(ap->perm[1]&0x40)) 301 inop->inode.iso_mode |= S_IXUSR; 302 if (!(ap->perm[0]&0x01)) 303 inop->inode.iso_mode |= S_IRGRP; 304 if (!(ap->perm[0]&0x04)) 305 inop->inode.iso_mode |= S_IXGRP; 306 if (!(ap->perm[0]&0x10)) 307 inop->inode.iso_mode |= S_IROTH; 308 if (!(ap->perm[0]&0x40)) 309 inop->inode.iso_mode |= S_IXOTH; 310 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 311 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 312 } else 313 ap = NULL; 314 } 315 if (!ap) { 316 inop->inode.iso_mode |= 317 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 318 inop->inode.iso_uid = (uid_t)0; 319 inop->inode.iso_gid = (gid_t)0; 320 } 321 if (bp2) 322 brelse(bp2, 0); 323 } 324 325 /* 326 * Time stamps 327 */ 328 void 329 cd9660_deftstamp(isodir,inop,bp) 330 struct iso_directory_record *isodir; 331 struct iso_node *inop; 332 struct buf *bp; 333 { 334 struct buf *bp2 = NULL; 335 struct iso_mnt *imp; 336 struct iso_extended_attributes *ap = NULL; 337 int off; 338 339 if (!bp 340 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 341 && (off = isonum_711(isodir->ext_attr_length))) { 342 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 343 NULL, &bp2); 344 bp = bp2; 345 } 346 if (bp) { 347 ap = (struct iso_extended_attributes *)bp->b_data; 348 349 if (isonum_711(ap->version) == 1) { 350 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 351 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 352 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 353 inop->inode.iso_ctime = inop->inode.iso_atime; 354 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 355 inop->inode.iso_mtime = inop->inode.iso_ctime; 356 } else 357 ap = NULL; 358 } 359 if (!ap) { 360 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 361 inop->inode.iso_atime = inop->inode.iso_ctime; 362 inop->inode.iso_mtime = inop->inode.iso_ctime; 363 } 364 if (bp2) 365 brelse(bp2, 0); 366 } 367 368 int 369 cd9660_tstamp_conv7(pi,pu) 370 u_char *pi; 371 struct timespec *pu; 372 { 373 int crtime, days; 374 int y, m, d, hour, minute, second, tz; 375 376 y = pi[0] + 1900; 377 m = pi[1]; 378 d = pi[2]; 379 hour = pi[3]; 380 minute = pi[4]; 381 second = pi[5]; 382 tz = pi[6]; 383 384 if (y < 1970) { 385 pu->tv_sec = 0; 386 pu->tv_nsec = 0; 387 return 0; 388 } else { 389 #ifdef ORIGINAL 390 /* computes day number relative to Sept. 19th,1989 */ 391 /* don't even *THINK* about changing formula. It works! */ 392 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 393 #else 394 /* 395 * Changed :-) to make it relative to Jan. 1st, 1970 396 * and to disambiguate negative division 397 */ 398 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 399 #endif 400 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 401 402 /* timezone offset is unreliable on some disks */ 403 if (-48 <= tz && tz <= 52) 404 crtime -= tz * 15 * 60; 405 } 406 pu->tv_sec = crtime; 407 pu->tv_nsec = 0; 408 return 1; 409 } 410 411 static u_int 412 cd9660_chars2ui(begin,len) 413 u_char *begin; 414 int len; 415 { 416 u_int rc; 417 418 for (rc = 0; --len >= 0;) { 419 rc *= 10; 420 rc += *begin++ - '0'; 421 } 422 return rc; 423 } 424 425 int 426 cd9660_tstamp_conv17(pi,pu) 427 u_char *pi; 428 struct timespec *pu; 429 { 430 u_char tbuf[7]; 431 432 /* year:"0001"-"9999" -> -1900 */ 433 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 434 435 /* month: " 1"-"12" -> 1 - 12 */ 436 tbuf[1] = cd9660_chars2ui(pi + 4,2); 437 438 /* day: " 1"-"31" -> 1 - 31 */ 439 tbuf[2] = cd9660_chars2ui(pi + 6,2); 440 441 /* hour: " 0"-"23" -> 0 - 23 */ 442 tbuf[3] = cd9660_chars2ui(pi + 8,2); 443 444 /* minute:" 0"-"59" -> 0 - 59 */ 445 tbuf[4] = cd9660_chars2ui(pi + 10,2); 446 447 /* second:" 0"-"59" -> 0 - 59 */ 448 tbuf[5] = cd9660_chars2ui(pi + 12,2); 449 450 /* difference of GMT */ 451 tbuf[6] = pi[16]; 452 453 return cd9660_tstamp_conv7(tbuf,pu); 454 } 455 456 ino_t 457 isodirino(isodir, imp) 458 struct iso_directory_record *isodir; 459 struct iso_mnt *imp; 460 { 461 ino_t ino; 462 463 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 464 << imp->im_bshift; 465 return (ino); 466 } 467
Indexes created Tue Sep 23 14:10:03 GMT 2025