1 /* $NetBSD: cd9660_node.c,v 1.23 2008/02/27 19:43:36 matt 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@blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai@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 1.23 2008/02/27 19:43:36 matt 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(const u_char *, int); 75 76 /* 77 * Initialize hash links for inodes and dnodes. 78 */ 79 void 80 cd9660_init(void) 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(void) 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(void) 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_t dev, ino_t inum, int flags) 142 { 143 struct iso_node *ip; 144 struct vnode *vp; 145 146 loop: 147 mutex_enter(&cd9660_ihash_lock); 148 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 149 if (inum == ip->i_number && dev == ip->i_dev) { 150 vp = ITOV(ip); 151 if (flags == 0) { 152 mutex_exit(&cd9660_ihash_lock); 153 } else { 154 mutex_enter(&vp->v_interlock); 155 mutex_exit(&cd9660_ihash_lock); 156 if (vget(vp, flags | LK_INTERLOCK)) 157 goto loop; 158 } 159 return (vp); 160 } 161 } 162 mutex_exit(&cd9660_ihash_lock); 163 return (NULL); 164 } 165 166 /* 167 * Insert the inode into the hash table, and return it locked. 168 * 169 * ip->i_vnode must be initialized first. 170 */ 171 void 172 cd9660_ihashins(struct iso_node *ip) 173 { 174 struct ihashhead *ipp; 175 176 KASSERT(mutex_owned(&cd9660_hashlock)); 177 178 mutex_enter(&cd9660_ihash_lock); 179 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 180 LIST_INSERT_HEAD(ipp, ip, i_hash); 181 mutex_exit(&cd9660_ihash_lock); 182 183 vlockmgr(&ip->i_vnode->v_lock, LK_EXCLUSIVE); 184 } 185 186 /* 187 * Remove the inode from the hash table. 188 */ 189 void 190 cd9660_ihashrem(struct iso_node *ip) 191 { 192 mutex_enter(&cd9660_ihash_lock); 193 LIST_REMOVE(ip, i_hash); 194 mutex_exit(&cd9660_ihash_lock); 195 } 196 197 /* 198 * Last reference to an inode, write the inode out and if necessary, 199 * truncate and deallocate the file. 200 */ 201 int 202 cd9660_inactive(void *v) 203 { 204 struct vop_inactive_args /* { 205 struct vnode *a_vp; 206 bool *a_recycle; 207 } */ *ap = v; 208 struct vnode *vp = ap->a_vp; 209 struct iso_node *ip = VTOI(vp); 210 int error = 0; 211 212 /* 213 * If we are done with the inode, reclaim it 214 * so that it can be reused immediately. 215 */ 216 ip->i_flag = 0; 217 *ap->a_recycle = (ip->inode.iso_mode == 0); 218 VOP_UNLOCK(vp, 0); 219 return error; 220 } 221 222 /* 223 * Reclaim an inode so that it can be used for other purposes. 224 */ 225 int 226 cd9660_reclaim(void *v) 227 { 228 struct vop_reclaim_args /* { 229 struct vnode *a_vp; 230 struct lwp *a_l; 231 } */ *ap = v; 232 struct vnode *vp = ap->a_vp; 233 struct iso_node *ip = VTOI(vp); 234 235 if (prtactive && vp->v_usecount > 1) 236 vprint("cd9660_reclaim: pushing active", vp); 237 /* 238 * Remove the inode from its hash chain. 239 */ 240 cd9660_ihashrem(ip); 241 /* 242 * Purge old data structures associated with the inode. 243 */ 244 cache_purge(vp); 245 if (ip->i_devvp) { 246 vrele(ip->i_devvp); 247 ip->i_devvp = 0; 248 } 249 genfs_node_destroy(vp); 250 pool_put(&cd9660_node_pool, vp->v_data); 251 vp->v_data = NULL; 252 return (0); 253 } 254 255 /* 256 * File attributes 257 */ 258 void 259 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 260 struct buf *bp) 261 { 262 struct buf *bp2 = NULL; 263 struct iso_mnt *imp; 264 struct iso_extended_attributes *ap = NULL; 265 int off; 266 267 if (isonum_711(isodir->flags)&2) { 268 inop->inode.iso_mode = S_IFDIR; 269 /* 270 * If we return 2, fts() will assume there are no subdirectories 271 * (just links for the path and .), so instead we return 1. 272 */ 273 inop->inode.iso_links = 1; 274 } else { 275 inop->inode.iso_mode = S_IFREG; 276 inop->inode.iso_links = 1; 277 } 278 if (!bp 279 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 280 && (off = isonum_711(isodir->ext_attr_length))) { 281 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 282 NULL, &bp2); 283 bp = bp2; 284 } 285 if (bp) { 286 ap = (struct iso_extended_attributes *)bp->b_data; 287 288 if (isonum_711(ap->version) == 1) { 289 if (!(ap->perm[1]&0x10)) 290 inop->inode.iso_mode |= S_IRUSR; 291 if (!(ap->perm[1]&0x40)) 292 inop->inode.iso_mode |= S_IXUSR; 293 if (!(ap->perm[0]&0x01)) 294 inop->inode.iso_mode |= S_IRGRP; 295 if (!(ap->perm[0]&0x04)) 296 inop->inode.iso_mode |= S_IXGRP; 297 if (!(ap->perm[0]&0x10)) 298 inop->inode.iso_mode |= S_IROTH; 299 if (!(ap->perm[0]&0x40)) 300 inop->inode.iso_mode |= S_IXOTH; 301 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 302 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 303 } else 304 ap = NULL; 305 } 306 if (!ap) { 307 inop->inode.iso_mode |= 308 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 309 inop->inode.iso_uid = (uid_t)0; 310 inop->inode.iso_gid = (gid_t)0; 311 } 312 if (bp2) 313 brelse(bp2, 0); 314 } 315 316 /* 317 * Time stamps 318 */ 319 void 320 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 321 struct buf *bp) 322 { 323 struct buf *bp2 = NULL; 324 struct iso_mnt *imp; 325 struct iso_extended_attributes *ap = NULL; 326 int off; 327 328 if (!bp 329 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 330 && (off = isonum_711(isodir->ext_attr_length))) { 331 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 332 NULL, &bp2); 333 bp = bp2; 334 } 335 if (bp) { 336 ap = (struct iso_extended_attributes *)bp->b_data; 337 338 if (isonum_711(ap->version) == 1) { 339 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 340 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 341 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 342 inop->inode.iso_ctime = inop->inode.iso_atime; 343 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 344 inop->inode.iso_mtime = inop->inode.iso_ctime; 345 } else 346 ap = NULL; 347 } 348 if (!ap) { 349 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 350 inop->inode.iso_atime = inop->inode.iso_ctime; 351 inop->inode.iso_mtime = inop->inode.iso_ctime; 352 } 353 if (bp2) 354 brelse(bp2, 0); 355 } 356 357 int 358 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu) 359 { 360 int crtime, days; 361 int y, m, d, hour, minute, second, tz; 362 363 y = pi[0] + 1900; 364 m = pi[1]; 365 d = pi[2]; 366 hour = pi[3]; 367 minute = pi[4]; 368 second = pi[5]; 369 tz = pi[6]; 370 371 if (y < 1970) { 372 pu->tv_sec = 0; 373 pu->tv_nsec = 0; 374 return 0; 375 } else { 376 #ifdef ORIGINAL 377 /* computes day number relative to Sept. 19th,1989 */ 378 /* don't even *THINK* about changing formula. It works! */ 379 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 380 #else 381 /* 382 * Changed :-) to make it relative to Jan. 1st, 1970 383 * and to disambiguate negative division 384 */ 385 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 386 #endif 387 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 388 389 /* timezone offset is unreliable on some disks */ 390 if (-48 <= tz && tz <= 52) 391 crtime -= tz * 15 * 60; 392 } 393 pu->tv_sec = crtime; 394 pu->tv_nsec = 0; 395 return 1; 396 } 397 398 static u_int 399 cd9660_chars2ui(const u_char *begin, int len) 400 { 401 u_int rc; 402 403 for (rc = 0; --len >= 0;) { 404 rc *= 10; 405 rc += *begin++ - '0'; 406 } 407 return rc; 408 } 409 410 int 411 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu) 412 { 413 u_char tbuf[7]; 414 415 /* year:"0001"-"9999" -> -1900 */ 416 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 417 418 /* month: " 1"-"12" -> 1 - 12 */ 419 tbuf[1] = cd9660_chars2ui(pi + 4,2); 420 421 /* day: " 1"-"31" -> 1 - 31 */ 422 tbuf[2] = cd9660_chars2ui(pi + 6,2); 423 424 /* hour: " 0"-"23" -> 0 - 23 */ 425 tbuf[3] = cd9660_chars2ui(pi + 8,2); 426 427 /* minute:" 0"-"59" -> 0 - 59 */ 428 tbuf[4] = cd9660_chars2ui(pi + 10,2); 429 430 /* second:" 0"-"59" -> 0 - 59 */ 431 tbuf[5] = cd9660_chars2ui(pi + 12,2); 432 433 /* difference of GMT */ 434 tbuf[6] = pi[16]; 435 436 return cd9660_tstamp_conv7(tbuf,pu); 437 } 438 439 ino_t 440 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 441 { 442 ino_t ino; 443 444 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 445 << imp->im_bshift; 446 return (ino); 447 } 448