1 /* $NetBSD: cd9660_node.c,v 1.31 2014/05/10 14:11:58 martin 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 1.31 2014/05/10 14:11:58 martin 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, true, &isohash); 87 mutex_init(&cd9660_ihash_lock, MUTEX_DEFAULT, IPL_NONE); 88 mutex_init(&cd9660_hashlock, MUTEX_DEFAULT, IPL_NONE); 89 } 90 91 /* 92 * Reinitialize inode hash table. 93 */ 94 95 void 96 cd9660_reinit(void) 97 { 98 struct iso_node *ip; 99 struct ihashhead *oldhash1, *hash1; 100 u_long oldmask1, mask1, val; 101 u_int i; 102 103 hash1 = hashinit(desiredvnodes, HASH_LIST, true, &mask1); 104 105 mutex_enter(&cd9660_ihash_lock); 106 oldhash1 = isohashtbl; 107 oldmask1 = isohash; 108 isohashtbl = hash1; 109 isohash = mask1; 110 for (i = 0; i <= oldmask1; i++) { 111 while ((ip = LIST_FIRST(&oldhash1[i])) != NULL) { 112 LIST_REMOVE(ip, i_hash); 113 val = INOHASH(ip->i_dev, ip->i_number); 114 LIST_INSERT_HEAD(&hash1[val], ip, i_hash); 115 } 116 } 117 mutex_exit(&cd9660_ihash_lock); 118 hashdone(oldhash1, HASH_LIST, oldmask1); 119 } 120 121 /* 122 * Destroy node pool and hash table. 123 */ 124 void 125 cd9660_done(void) 126 { 127 hashdone(isohashtbl, HASH_LIST, isohash); 128 pool_destroy(&cd9660_node_pool); 129 mutex_destroy(&cd9660_ihash_lock); 130 mutex_destroy(&cd9660_hashlock); 131 malloc_type_detach(M_ISOFSMNT); 132 } 133 134 /* 135 * Use the device/inum pair to find the incore inode, and return a pointer 136 * to it. If it is in core, but locked, wait for it. 137 */ 138 struct vnode * 139 cd9660_ihashget(dev_t dev, ino_t inum, int flags) 140 { 141 struct iso_node *ip; 142 struct vnode *vp; 143 144 loop: 145 mutex_enter(&cd9660_ihash_lock); 146 LIST_FOREACH(ip, &isohashtbl[INOHASH(dev, inum)], i_hash) { 147 if (inum == ip->i_number && dev == ip->i_dev) { 148 vp = ITOV(ip); 149 if (flags == 0) { 150 mutex_exit(&cd9660_ihash_lock); 151 } else { 152 mutex_enter(vp->v_interlock); 153 mutex_exit(&cd9660_ihash_lock); 154 if (vget(vp, flags)) 155 goto loop; 156 } 157 return (vp); 158 } 159 } 160 mutex_exit(&cd9660_ihash_lock); 161 return (NULL); 162 } 163 164 /* 165 * Insert the inode into the hash table, and return it locked. 166 * 167 * ip->i_vnode must be initialized first. 168 */ 169 void 170 cd9660_ihashins(struct iso_node *ip) 171 { 172 struct ihashhead *ipp; 173 int error __diagused; 174 175 KASSERT(mutex_owned(&cd9660_hashlock)); 176 177 mutex_enter(&cd9660_ihash_lock); 178 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 179 LIST_INSERT_HEAD(ipp, ip, i_hash); 180 mutex_exit(&cd9660_ihash_lock); 181 182 error = VOP_LOCK(ITOV(ip), LK_EXCLUSIVE); 183 KASSERT(error == 0); 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); 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 if (ip->i_devvp) { 245 vrele(ip->i_devvp); 246 ip->i_devvp = 0; 247 } 248 genfs_node_destroy(vp); 249 pool_put(&cd9660_node_pool, vp->v_data); 250 vp->v_data = NULL; 251 return (0); 252 } 253 254 /* 255 * File attributes 256 */ 257 void 258 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 259 struct buf *bp) 260 { 261 struct buf *bp2 = NULL; 262 struct iso_mnt *imp; 263 struct iso_extended_attributes *ap = NULL; 264 int off; 265 266 if (isonum_711(isodir->flags)&2) { 267 inop->inode.iso_mode = S_IFDIR; 268 /* 269 * If we return 2, fts() will assume there are no subdirectories 270 * (just links for the path and .), so instead we return 1. 271 */ 272 inop->inode.iso_links = 1; 273 } else { 274 inop->inode.iso_mode = S_IFREG; 275 inop->inode.iso_links = 1; 276 } 277 if (!bp 278 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 279 && (off = isonum_711(isodir->ext_attr_length))) { 280 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 281 NULL, &bp2); 282 bp = bp2; 283 } 284 if (bp) { 285 ap = (struct iso_extended_attributes *)bp->b_data; 286 287 if (isonum_711(ap->version) == 1) { 288 if (!(ap->perm[1]&0x10)) 289 inop->inode.iso_mode |= S_IRUSR; 290 if (!(ap->perm[1]&0x40)) 291 inop->inode.iso_mode |= S_IXUSR; 292 if (!(ap->perm[0]&0x01)) 293 inop->inode.iso_mode |= S_IRGRP; 294 if (!(ap->perm[0]&0x04)) 295 inop->inode.iso_mode |= S_IXGRP; 296 if (!(ap->perm[0]&0x10)) 297 inop->inode.iso_mode |= S_IROTH; 298 if (!(ap->perm[0]&0x40)) 299 inop->inode.iso_mode |= S_IXOTH; 300 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 301 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 302 } else 303 ap = NULL; 304 } 305 if (!ap) { 306 inop->inode.iso_mode |= 307 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 308 inop->inode.iso_uid = (uid_t)0; 309 inop->inode.iso_gid = (gid_t)0; 310 } 311 if (bp2) 312 brelse(bp2, 0); 313 } 314 315 /* 316 * Time stamps 317 */ 318 void 319 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 320 struct buf *bp) 321 { 322 struct buf *bp2 = NULL; 323 struct iso_mnt *imp; 324 struct iso_extended_attributes *ap = NULL; 325 int off; 326 327 if (!bp 328 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 329 && (off = isonum_711(isodir->ext_attr_length))) { 330 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), 331 NULL, &bp2); 332 bp = bp2; 333 } 334 if (bp) { 335 ap = (struct iso_extended_attributes *)bp->b_data; 336 337 if (isonum_711(ap->version) == 1) { 338 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 339 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 340 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 341 inop->inode.iso_ctime = inop->inode.iso_atime; 342 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 343 inop->inode.iso_mtime = inop->inode.iso_ctime; 344 } else 345 ap = NULL; 346 } 347 if (!ap) { 348 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 349 inop->inode.iso_atime = inop->inode.iso_ctime; 350 inop->inode.iso_mtime = inop->inode.iso_ctime; 351 } 352 if (bp2) 353 brelse(bp2, 0); 354 } 355 356 int 357 cd9660_tstamp_conv7(const u_char *pi, struct timespec *pu) 358 { 359 int crtime, days; 360 int y, m, d, hour, minute, second, tz; 361 362 y = pi[0] + 1900; 363 m = pi[1]; 364 d = pi[2]; 365 hour = pi[3]; 366 minute = pi[4]; 367 second = pi[5]; 368 tz = pi[6]; 369 370 if (y < 1970) { 371 pu->tv_sec = 0; 372 pu->tv_nsec = 0; 373 return 0; 374 } else { 375 #ifdef ORIGINAL 376 /* computes day number relative to Sept. 19th,1989 */ 377 /* don't even *THINK* about changing formula. It works! */ 378 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 379 #else 380 /* 381 * Changed :-) to make it relative to Jan. 1st, 1970 382 * and to disambiguate negative division 383 */ 384 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 385 #endif 386 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 387 388 /* timezone offset is unreliable on some disks */ 389 if (-48 <= tz && tz <= 52) 390 crtime -= tz * 15 * 60; 391 } 392 pu->tv_sec = crtime; 393 pu->tv_nsec = 0; 394 return 1; 395 } 396 397 static u_int 398 cd9660_chars2ui(const u_char *begin, int len) 399 { 400 u_int rc; 401 402 for (rc = 0; --len >= 0;) { 403 rc *= 10; 404 rc += *begin++ - '0'; 405 } 406 return rc; 407 } 408 409 int 410 cd9660_tstamp_conv17(const u_char *pi, struct timespec *pu) 411 { 412 u_char tbuf[7]; 413 414 /* year:"0001"-"9999" -> -1900 */ 415 tbuf[0] = cd9660_chars2ui(pi,4) - 1900; 416 417 /* month: " 1"-"12" -> 1 - 12 */ 418 tbuf[1] = cd9660_chars2ui(pi + 4,2); 419 420 /* day: " 1"-"31" -> 1 - 31 */ 421 tbuf[2] = cd9660_chars2ui(pi + 6,2); 422 423 /* hour: " 0"-"23" -> 0 - 23 */ 424 tbuf[3] = cd9660_chars2ui(pi + 8,2); 425 426 /* minute:" 0"-"59" -> 0 - 59 */ 427 tbuf[4] = cd9660_chars2ui(pi + 10,2); 428 429 /* second:" 0"-"59" -> 0 - 59 */ 430 tbuf[5] = cd9660_chars2ui(pi + 12,2); 431 432 /* difference of GMT */ 433 tbuf[6] = pi[16]; 434 435 return cd9660_tstamp_conv7(tbuf,pu); 436 } 437 438 ino_t 439 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 440 { 441 ino_t ino; 442 443 /* 444 * Note there is an inverse calculation in 445 * cd9660_vfsops.c:cd9660_vget_internal(): 446 * ip->iso_start = ino >> imp->im_bshift; 447 * and also a calculation of the isodir pointer 448 * from an inode in cd9660_vnops.c:cd9660_readlink() 449 */ 450 ino = ((ino_t)isonum_733(isodir->extent) + 451 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 452 return ino; 453 } 454