cd9660_node.c revision 1.15.4.1
1 /* $NetBSD: cd9660_node.c,v 1.15.4.1 2007/12/09 16:03:59 reinoud 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 1.15.4.1 2007/12/09 16:03:59 reinoud 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 POOL_INIT(cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, "cd9660nopl", 73 &pool_allocator_nointr, IPL_NONE); 74 75 static u_int cd9660_chars2ui(u_char *, int); 76 77 /* 78 * Initialize hash links for inodes and dnodes. 79 */ 80 void 81 cd9660_init() 82 { 83 #ifdef _LKM 84 malloc_type_attach(M_ISOFSMNT); 85 pool_init(&cd9660_node_pool, sizeof(struct iso_node), 0, 0, 0, 86 "cd9660nopl", &pool_allocator_nointr, IPL_NONE); 87 #endif 88 isohashtbl = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 89 &isohash); 90 mutex_init(&cd9660_ihash_lock, MUTEX_DEFAULT, IPL_NONE); 91 mutex_init(&cd9660_hashlock, MUTEX_DEFAULT, IPL_NONE); 92 } 93 94 /* 95 * Reinitialize inode hash table. 96 */ 97 98 void 99 cd9660_reinit() 100 { 101 struct iso_node *ip; 102 struct ihashhead *oldhash1, *hash1; 103 u_long oldmask1, mask1, val; 104 u_int i; 105 106 hash1 = hashinit(desiredvnodes, HASH_LIST, M_ISOFSMNT, M_WAITOK, 107 &mask1); 108 109 mutex_enter(&cd9660_ihash_lock); 110 oldhash1 = isohashtbl; 111 oldmask1 = isohash; 112 isohashtbl = hash1; 113 isohash = mask1; 114 for (i = 0; i <= oldmask1; i++) { 115 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) { 116 LIST_REMOVE(ip, i_hash); 117 val = INOHASH(ip->i_dev, ip->i_number); 118 LIST_INSERT_HEAD(&hash1[val], ip, i_hash); 119 } 120 } 121 mutex_exit(&cd9660_ihash_lock); 122 hashdone(oldhash1, M_ISOFSMNT); 123 } 124 125 /* 126 * Destroy node pool and hash table. 127 */ 128 void 129 cd9660_done() 130 { 131 hashdone(isohashtbl, M_ISOFSMNT); 132 pool_destroy(&cd9660_node_pool); 133 mutex_destroy(&cd9660_ihash_lock); 134 mutex_destroy(&cd9660_hashlock); 135 malloc_type_detach(M_ISOFSMNT); 136 #endif 137 } 138 139 /* 140 * Use the device/inum pair to find the incore inode, and return a pointer 141 * to it. If it is in core, but locked, wait for it. 142 */ 143 struct vnode * 144 cd9660_ihashget(dev, inum, flags) 145 dev_t dev; 146 ino_t inum; 147 int flags; 148 { 149 struct iso_node *ip; 150 struct vnode *vp; 151 152 loop: 153 mutex_enter(&cd9660_ihash_lock); 154 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 155 if (inum == ip->i_number && dev == ip->i_dev) { 156 vp = ITOV(ip); 157 if (flags == 0) { 158 mutex_exit(&cd9660_ihash_lock); 159 } else { 160 simple_lock(&vp->v_interlock); 161 mutex_exit(&cd9660_ihash_lock); 162 if (vget(vp, flags | LK_INTERLOCK)) 163 goto loop; 164 } 165 return (vp); 166 } 167 } 168 mutex_exit(&cd9660_ihash_lock); 169 return (NULL); 170 } 171 172 /* 173 * Insert the inode into the hash table, and return it locked. 174 * 175 * ip->i_vnode must be initialized first. 176 */ 177 void 178 cd9660_ihashins(ip) 179 struct iso_node *ip; 180 { 181 struct ihashhead *ipp; 182 183 KASSERT(mutex_owned(&cd9660_hashlock)); 184 185 mutex_enter(&cd9660_ihash_lock); 186 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 187 LIST_INSERT_HEAD(ipp, ip, i_hash); 188 mutex_exit(&cd9660_ihash_lock); 189 190 lockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE, &ip->i_vnode->v_interlock); 191 } 192 193 /* 194 * Remove the inode from the hash table. 195 */ 196 void 197 cd9660_ihashrem(ip) 198 struct iso_node *ip; 199 { 200 mutex_enter(&cd9660_ihash_lock); 201 LIST_REMOVE(ip, i_hash); 202 mutex_exit(&cd9660_ihash_lock); 203 } 204 205 /* 206 * Last reference to an inode, write the inode out and if necessary, 207 * truncate and deallocate the file. 208 */ 209 int 210 cd9660_inactive(v) 211 void *v; 212 { 213 struct vop_inactive_args /* { 214 struct vnode *a_vp; 215 struct lwp *a_l; 216 } */ *ap = v; 217 struct vnode *vp = ap->a_vp; 218 struct lwp *l = ap->a_l; 219 struct iso_node *ip = VTOI(vp); 220 int error = 0; 221 222 if (prtactive && vp->v_usecount != 0) 223 vprint("cd9660_inactive: pushing active", vp); 224 225 ip->i_flag = 0; 226 VOP_UNLOCK(vp, 0); 227 /* 228 * If we are done with the inode, reclaim it 229 * so that it can be reused immediately. 230 */ 231 if (ip->inode.iso_mode == 0) 232 vrecycle(vp, (struct simplelock *)0, l); 233 return error; 234 } 235 236 /* 237 * Reclaim an inode so that it can be used for other purposes. 238 */ 239 int 240 cd9660_reclaim(v) 241 void *v; 242 { 243 struct vop_reclaim_args /* { 244 struct vnode *a_vp; 245 struct lwp *a_l; 246 } */ *ap = v; 247 struct vnode *vp = ap->a_vp; 248 struct iso_node *ip = VTOI(vp); 249 250 if (prtactive && vp->v_usecount != 0) 251 vprint("cd9660_reclaim: pushing active", vp); 252 /* 253 * Remove the inode from its hash chain. 254 */ 255 cd9660_ihashrem(ip); 256 /* 257 * Purge old data structures associated with the inode. 258 */ 259 cache_purge(vp); 260 if (ip->i_devvp) { 261 vrele(ip->i_devvp); 262 ip->i_devvp = 0; 263 } 264 genfs_node_destroy(vp); 265 pool_put(&cd9660_node_pool, vp->v_data); 266 vp->v_data = NULL; 267 return (0); 268 } 269 270 /* 271 * File attributes 272 */ 273 void 274 cd9660_defattr(isodir, inop, bp) 275 struct iso_directory_record *isodir; 276 struct iso_node *inop; 277 struct buf *bp; 278 { 279 struct buf *bp2 = NULL; 280 struct iso_mnt *imp; 281 struct iso_extended_attributes *ap = NULL; 282 int off; 283 284 if (isonum_711(isodir->flags)&2) { 285 inop->inode.iso_mode = S_IFDIR; 286 /* 287 * If we return 2, fts() will assume there are no subdirectories 288 * (just links for the path and .), so instead we return 1. 289 */ 290 inop->inode.iso_links = 1; 291 } else { 292 inop->inode.iso_mode = S_IFREG; 293 inop->inode.iso_links = 1; 294 } 295 if (!bp 296 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 297 && (off = isonum_711(isodir->ext_attr_length))) { 298 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 299 NULL, &bp2); 300 bp = bp2; 301 } 302 if (bp) { 303 ap = (struct iso_extended_attributes *)bp->b_data; 304 305 if (isonum_711(ap->version) == 1) { 306 if (!(ap->perm[1]&0x10)) 307 inop->inode.iso_mode |= S_IRUSR; 308 if (!(ap->perm[1]&0x40)) 309 inop->inode.iso_mode |= S_IXUSR; 310 if (!(ap->perm[0]&0x01)) 311 inop->inode.iso_mode |= S_IRGRP; 312 if (!(ap->perm[0]&0x04)) 313 inop->inode.iso_mode |= S_IXGRP; 314 if (!(ap->perm[0]&0x10)) 315 inop->inode.iso_mode |= S_IROTH; 316 if (!(ap->perm[0]&0x40)) 317 inop->inode.iso_mode |= S_IXOTH; 318 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 319 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 320 } else 321 ap = NULL; 322 } 323 if (!ap) { 324 inop->inode.iso_mode |= 325 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 326 inop->inode.iso_uid = (uid_t)0; 327 inop->inode.iso_gid = (gid_t)0; 328 } 329 if (bp2) 330 brelse(bp2); 331 } 332 333 /* 334 * Time stamps 335 */ 336 void 337 cd9660_deftstamp(isodir,inop,bp) 338 struct iso_directory_record *isodir; 339 struct iso_node *inop; 340 struct buf *bp; 341 { 342 struct buf *bp2 = NULL; 343 struct iso_mnt *imp; 344 struct iso_extended_attributes *ap = NULL; 345 int off; 346 347 if (!bp 348 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 349 && (off = isonum_711(isodir->ext_attr_length))) { 350 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 351 NULL, &bp2); 352 bp = bp2; 353 } 354 if (bp) { 355 ap = (struct iso_extended_attributes *)bp->b_data; 356 357 if (isonum_711(ap->version) == 1) { 358 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 359 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 360 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 361 inop->inode.iso_ctime = inop->inode.iso_atime; 362 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 363 inop->inode.iso_mtime = inop->inode.iso_ctime; 364 } else 365 ap = NULL; 366 } 367 if (!ap) { 368 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 369 inop->inode.iso_atime = inop->inode.iso_ctime; 370 inop->inode.iso_mtime = inop->inode.iso_ctime; 371 } 372 if (bp2) 373 brelse(bp2); 374 } 375 376 int 377 cd9660_tstamp_conv7(pi,pu) 378 u_char *pi; 379 struct timespec *pu; 380 { 381 int crtime, days; 382 int y, m, d, hour, minute, second, tz; 383 384 y = pi[0] + 1900; 385 m = pi[1]; 386 d = pi[2]; 387 hour = pi[3]; 388 minute = pi[4]; 389 second = pi[5]; 390 tz = pi[6]; 391 392 if (y < 1970) { 393 pu->tv_sec = 0; 394 pu->tv_nsec = 0; 395 return 0; 396 } else { 397 #ifdef ORIGINAL 398 /* computes day number relative to Sept. 19th,1989 */ 399 /* don't even *THINK* about changing formula. It works! */ 400 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 401 #else 402 /* 403 * Changed :-) to make it relative to Jan. 1st, 1970 404 * and to disambiguate negative division 405 */ 406 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 407 #endif 408 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 409 410 /* timezone offset is unreliable on some disks */ 411 if (-48 <= tz && tz <= 52) 412 crtime -= tz * 15 * 60; 413 } 414 pu->tv_sec = crtime; 415 pu->tv_nsec = 0; 416 return 1; 417 } 418 419 static u_int 420 cd9660_chars2ui(begin,len) 421 u_char *begin; 422 int len; 423 { 424 u_int rc; 425 426 for (rc = 0; --len >= 0;) { 427 rc *= 10; 428 rc += *begin++ - '0'; 429 } 430 return rc; 431 } 432 433 int 434 cd9660_tstamp_conv17(pi,pu) 435 u_char *pi; 436 struct timespec *pu; 437 { 438 u_char tbuf[7]; 439 440 /* year:"0001"-"9999" -> -1900 */ 441 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 442 443 /* month: " 1"-"12" -> 1 - 12 */ 444 tbuf[1] = cd9660_chars2ui(pi + 4,2); 445 446 /* day: " 1"-"31" -> 1 - 31 */ 447 tbuf[2] = cd9660_chars2ui(pi + 6,2); 448 449 /* hour: " 0"-"23" -> 0 - 23 */ 450 tbuf[3] = cd9660_chars2ui(pi + 8,2); 451 452 /* minute:" 0"-"59" -> 0 - 59 */ 453 tbuf[4] = cd9660_chars2ui(pi + 10,2); 454 455 /* second:" 0"-"59" -> 0 - 59 */ 456 tbuf[5] = cd9660_chars2ui(pi + 12,2); 457 458 /* difference of GMT */ 459 tbuf[6] = pi[16]; 460 461 return cd9660_tstamp_conv7(tbuf,pu); 462 } 463 464 ino_t 465 isodirino(isodir, imp) 466 struct iso_directory_record *isodir; 467 struct iso_mnt *imp; 468 { 469 ino_t ino; 470 471 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 472 << imp->im_bshift; 473 return (ino); 474 } 475
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