1 /*- 2 * Copyright (c) 1982, 1986, 1989, 1994, 1995 3 * The Regents of the University of California. All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley 6 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 7 * Support code is derived from software contributed to Berkeley 8 * by Atsushi Murai (amurai@spec.co.jp). 9 * 10 * %sccs.include.redist.c% 11 * 12 * @(#)cd9660_node.c 8.8 (Berkeley) 05/22/95 13 */ 14 15 #include <sys/param.h> 16 #include <sys/systm.h> 17 #include <sys/mount.h> 18 #include <sys/proc.h> 19 #include <sys/file.h> 20 #include <sys/buf.h> 21 #include <sys/vnode.h> 22 #include <sys/kernel.h> 23 #include <sys/malloc.h> 24 #include <sys/stat.h> 25 26 #include <isofs/cd9660/iso.h> 27 #include <isofs/cd9660/cd9660_node.h> 28 #include <isofs/cd9660/cd9660_mount.h> 29 #include <isofs/cd9660/iso_rrip.h> 30 31 /* 32 * Structures associated with iso_node caching. 33 */ 34 struct iso_node **isohashtbl; 35 u_long isohash; 36 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash) 37 struct simplelock cd9660_ihash_slock; 38 39 #ifdef ISODEVMAP 40 struct iso_node **idvhashtbl; 41 u_long idvhash; 42 #define DNOHASH(device, inum) (((device) + ((inum)>>12)) & idvhash) 43 #endif 44 45 int prtactive; /* 1 => print out reclaim of active vnodes */ 46 47 /* 48 * Initialize hash links for inodes and dnodes. 49 */ 50 cd9660_init(vfsp) 51 struct vfsconf *vfsp; 52 { 53 54 isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash); 55 simple_lock_init(&cd9660_ihash_slock); 56 #ifdef ISODEVMAP 57 idvhashtbl = hashinit(desiredvnodes / 8, M_ISOFSMNT, &idvhash); 58 #endif 59 } 60 61 #ifdef ISODEVMAP 62 /* 63 * Enter a new node into the device hash list 64 */ 65 struct iso_dnode * 66 iso_dmap(device, inum, create) 67 dev_t device; 68 ino_t inum; 69 int create; 70 { 71 register struct iso_dnode **dpp, *dp, *dq; 72 73 dpp = &idvhashtbl[DNOHASH(device, inum)]; 74 for (dp = *dpp;; dp = dp->d_next) { 75 if (dp == NULL) 76 return (NULL); 77 if (inum == dp->i_number && device == dp->i_dev) 78 return (dp); 79 80 if (!create) 81 return (NULL); 82 83 MALLOC(dp, struct iso_dnode *, sizeof(struct iso_dnode), M_CACHE, 84 M_WAITOK); 85 dp->i_dev = dev; 86 dp->i_number = ino; 87 88 if (dq = *dpp) 89 dq->d_prev = dp->d_next; 90 dp->d_next = dq; 91 dp->d_prev = dpp; 92 *dpp = dp; 93 94 return (dp); 95 } 96 97 void 98 iso_dunmap(device) 99 dev_t device; 100 { 101 struct iso_dnode **dpp, *dp, *dq; 102 103 for (dpp = idvhashtbl; dpp <= idvhashtbl + idvhash; dpp++) { 104 for (dp = *dpp; dp != NULL; dp = dq) 105 dq = dp->d_next; 106 if (device == dp->i_dev) { 107 if (dq) 108 dq->d_prev = dp->d_prev; 109 *dp->d_prev = dq; 110 FREE(dp, M_CACHE); 111 } 112 } 113 } 114 } 115 #endif 116 117 /* 118 * Use the device/inum pair to find the incore inode, and return a pointer 119 * to it. If it is in core, but locked, wait for it. 120 */ 121 struct vnode * 122 cd9660_ihashget(dev, inum) 123 dev_t dev; 124 ino_t inum; 125 { 126 struct proc *p = curproc; /* XXX */ 127 struct iso_node *ip; 128 struct vnode *vp; 129 130 loop: 131 simple_lock(&cd9660_ihash_slock); 132 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 133 if (inum == ip->i_number && dev == ip->i_dev) { 134 vp = ITOV(ip); 135 simple_lock(&vp->v_interlock); 136 simple_unlock(&cd9660_ihash_slock); 137 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) 138 goto loop; 139 return (vp); 140 } 141 } 142 simple_unlock(&cd9660_ihash_slock); 143 return (NULL); 144 } 145 146 /* 147 * Insert the inode into the hash table, and return it locked. 148 */ 149 void 150 cd9660_ihashins(ip) 151 struct iso_node *ip; 152 { 153 struct proc *p = curproc; /* XXX */ 154 struct iso_node **ipp, *iq; 155 156 simple_lock(&cd9660_ihash_slock); 157 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 158 if (iq = *ipp) 159 iq->i_prev = &ip->i_next; 160 ip->i_next = iq; 161 ip->i_prev = ipp; 162 *ipp = ip; 163 simple_unlock(&cd9660_ihash_slock); 164 165 lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0, p); 166 } 167 168 /* 169 * Remove the inode from the hash table. 170 */ 171 void 172 cd9660_ihashrem(ip) 173 register struct iso_node *ip; 174 { 175 register struct iso_node *iq; 176 177 simple_lock(&cd9660_ihash_slock); 178 if (iq = ip->i_next) 179 iq->i_prev = ip->i_prev; 180 *ip->i_prev = iq; 181 #ifdef DIAGNOSTIC 182 ip->i_next = NULL; 183 ip->i_prev = NULL; 184 #endif 185 simple_unlock(&cd9660_ihash_slock); 186 } 187 188 /* 189 * Last reference to an inode, write the inode out and if necessary, 190 * truncate and deallocate the file. 191 */ 192 int 193 cd9660_inactive(ap) 194 struct vop_inactive_args /* { 195 struct vnode *a_vp; 196 struct proc *a_p; 197 } */ *ap; 198 { 199 struct vnode *vp = ap->a_vp; 200 struct proc *p = ap->a_p; 201 register struct iso_node *ip = VTOI(vp); 202 int mode, error = 0; 203 204 if (prtactive && vp->v_usecount != 0) 205 vprint("cd9660_inactive: pushing active", vp); 206 207 ip->i_flag = 0; 208 VOP_UNLOCK(vp, 0, p); 209 /* 210 * If we are done with the inode, reclaim it 211 * so that it can be reused immediately. 212 */ 213 if (ip->inode.iso_mode == 0) 214 vrecycle(vp, (struct simplelock *)0, p); 215 return error; 216 } 217 218 /* 219 * Reclaim an inode so that it can be used for other purposes. 220 */ 221 int 222 cd9660_reclaim(ap) 223 struct vop_reclaim_args /* { 224 struct vnode *a_vp; 225 struct proc *a_p; 226 } */ *ap; 227 { 228 register struct vnode *vp = ap->a_vp; 229 register struct iso_node *ip = VTOI(vp); 230 int i; 231 232 if (prtactive && vp->v_usecount != 0) 233 vprint("cd9660_reclaim: pushing active", vp); 234 /* 235 * Remove the inode from its hash chain. 236 */ 237 cd9660_ihashrem(ip); 238 /* 239 * Purge old data structures associated with the inode. 240 */ 241 cache_purge(vp); 242 if (ip->i_devvp) { 243 vrele(ip->i_devvp); 244 ip->i_devvp = 0; 245 } 246 FREE(vp->v_data, M_ISOFSNODE); 247 vp->v_data = NULL; 248 return (0); 249 } 250 251 /* 252 * File attributes 253 */ 254 void 255 cd9660_defattr(isodir, inop, bp) 256 struct iso_directory_record *isodir; 257 struct iso_node *inop; 258 struct buf *bp; 259 { 260 struct buf *bp2 = NULL; 261 struct iso_mnt *imp; 262 struct iso_extended_attributes *ap = NULL; 263 int off; 264 265 if (isonum_711(isodir->flags)&2) { 266 inop->inode.iso_mode = S_IFDIR; 267 /* 268 * If we return 2, fts() will assume there are no subdirectories 269 * (just links for the path and .), so instead we return 1. 270 */ 271 inop->inode.iso_links = 1; 272 } else { 273 inop->inode.iso_mode = S_IFREG; 274 inop->inode.iso_links = 1; 275 } 276 if (!bp 277 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 278 && (off = isonum_711(isodir->ext_attr_length))) { 279 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 280 &bp2); 281 bp = bp2; 282 } 283 if (bp) { 284 ap = (struct iso_extended_attributes *)bp->b_data; 285 286 if (isonum_711(ap->version) == 1) { 287 if (!(ap->perm[0]&0x40)) 288 inop->inode.iso_mode |= VEXEC >> 6; 289 if (!(ap->perm[0]&0x10)) 290 inop->inode.iso_mode |= VREAD >> 6; 291 if (!(ap->perm[0]&4)) 292 inop->inode.iso_mode |= VEXEC >> 3; 293 if (!(ap->perm[0]&1)) 294 inop->inode.iso_mode |= VREAD >> 3; 295 if (!(ap->perm[1]&0x40)) 296 inop->inode.iso_mode |= VEXEC; 297 if (!(ap->perm[1]&0x10)) 298 inop->inode.iso_mode |= VREAD; 299 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 300 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 301 } else 302 ap = NULL; 303 } 304 if (!ap) { 305 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 306 inop->inode.iso_uid = (uid_t)0; 307 inop->inode.iso_gid = (gid_t)0; 308 } 309 if (bp2) 310 brelse(bp2); 311 } 312 313 /* 314 * Time stamps 315 */ 316 void 317 cd9660_deftstamp(isodir,inop,bp) 318 struct iso_directory_record *isodir; 319 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 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 331 &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); 354 } 355 356 int 357 cd9660_tstamp_conv7(pi,pu) 358 u_char *pi; 359 struct timespec *pu; 360 { 361 int i; 362 int crtime, days; 363 int y, m, d, hour, minute, second, tz; 364 365 y = pi[0] + 1900; 366 m = pi[1]; 367 d = pi[2]; 368 hour = pi[3]; 369 minute = pi[4]; 370 second = pi[5]; 371 tz = pi[6]; 372 373 if (y < 1970) { 374 pu->ts_sec = 0; 375 pu->ts_nsec = 0; 376 return 0; 377 } else { 378 #ifdef ORIGINAL 379 /* computes day number relative to Sept. 19th,1989 */ 380 /* don't even *THINK* about changing formula. It works! */ 381 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 382 #else 383 /* 384 * Changed :-) to make it relative to Jan. 1st, 1970 385 * and to disambiguate negative division 386 */ 387 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 388 #endif 389 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 390 391 /* timezone offset is unreliable on some disks */ 392 if (-48 <= tz && tz <= 52) 393 crtime -= tz * 15 * 60; 394 } 395 pu->ts_sec = crtime; 396 pu->ts_nsec = 0; 397 return 1; 398 } 399 400 static u_int 401 cd9660_chars2ui(begin,len) 402 u_char *begin; 403 int len; 404 { 405 u_int rc; 406 407 for (rc = 0; --len >= 0;) { 408 rc *= 10; 409 rc += *begin++ - '0'; 410 } 411 return rc; 412 } 413 414 int 415 cd9660_tstamp_conv17(pi,pu) 416 u_char *pi; 417 struct timespec *pu; 418 { 419 u_char buf[7]; 420 421 /* year:"0001"-"9999" -> -1900 */ 422 buf[0] = cd9660_chars2ui(pi,4) - 1900; 423 424 /* month: " 1"-"12" -> 1 - 12 */ 425 buf[1] = cd9660_chars2ui(pi + 4,2); 426 427 /* day: " 1"-"31" -> 1 - 31 */ 428 buf[2] = cd9660_chars2ui(pi + 6,2); 429 430 /* hour: " 0"-"23" -> 0 - 23 */ 431 buf[3] = cd9660_chars2ui(pi + 8,2); 432 433 /* minute:" 0"-"59" -> 0 - 59 */ 434 buf[4] = cd9660_chars2ui(pi + 10,2); 435 436 /* second:" 0"-"59" -> 0 - 59 */ 437 buf[5] = cd9660_chars2ui(pi + 12,2); 438 439 /* difference of GMT */ 440 buf[6] = pi[16]; 441 442 return cd9660_tstamp_conv7(buf,pu); 443 } 444 445 ino_t 446 isodirino(isodir, imp) 447 struct iso_directory_record *isodir; 448 struct iso_mnt *imp; 449 { 450 ino_t ino; 451 452 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 453 << imp->im_bshift; 454 return (ino); 455 } 456