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 8.7 (Berkeley) 05/14/95 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 register struct iso_node *ip = VTOI(vp); 201 int mode, error = 0; 202 203 if (prtactive && vp->v_usecount != 0) 204 vprint("cd9660_inactive: pushing active", vp); 205 206 ip->i_flag = 0; 207 /* 208 * If we are done with the inode, reclaim it 209 * so that it can be reused immediately. 210 */ 211 if (vp->v_usecount == 0 && ip->inode.iso_mode == 0) 212 vgone(vp); 213 return error; 214 } 215 216 /* 217 * Reclaim an inode so that it can be used for other purposes. 218 */ 219 int 220 cd9660_reclaim(ap) 221 struct vop_reclaim_args /* { 222 struct vnode *a_vp; 223 struct proc *a_p; 224 } */ *ap; 225 { 226 register struct vnode *vp = ap->a_vp; 227 register struct iso_node *ip = VTOI(vp); 228 int i; 229 230 if (prtactive && vp->v_usecount != 0) 231 vprint("cd9660_reclaim: pushing active", vp); 232 /* 233 * Remove the inode from its hash chain. 234 */ 235 cd9660_ihashrem(ip); 236 /* 237 * Purge old data structures associated with the inode. 238 */ 239 cache_purge(vp); 240 if (ip->i_devvp) { 241 vrele(ip->i_devvp); 242 ip->i_devvp = 0; 243 } 244 FREE(vp->v_data, M_ISOFSNODE); 245 vp->v_data = NULL; 246 return (0); 247 } 248 249 /* 250 * File attributes 251 */ 252 void 253 cd9660_defattr(isodir, inop, bp) 254 struct iso_directory_record *isodir; 255 struct iso_node *inop; 256 struct buf *bp; 257 { 258 struct buf *bp2 = NULL; 259 struct iso_mnt *imp; 260 struct iso_extended_attributes *ap = NULL; 261 int off; 262 263 if (isonum_711(isodir->flags)&2) { 264 inop->inode.iso_mode = S_IFDIR; 265 /* 266 * If we return 2, fts() will assume there are no subdirectories 267 * (just links for the path and .), so instead we return 1. 268 */ 269 inop->inode.iso_links = 1; 270 } else { 271 inop->inode.iso_mode = S_IFREG; 272 inop->inode.iso_links = 1; 273 } 274 if (!bp 275 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 276 && (off = isonum_711(isodir->ext_attr_length))) { 277 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 278 &bp2); 279 bp = bp2; 280 } 281 if (bp) { 282 ap = (struct iso_extended_attributes *)bp->b_data; 283 284 if (isonum_711(ap->version) == 1) { 285 if (!(ap->perm[0]&0x40)) 286 inop->inode.iso_mode |= VEXEC >> 6; 287 if (!(ap->perm[0]&0x10)) 288 inop->inode.iso_mode |= VREAD >> 6; 289 if (!(ap->perm[0]&4)) 290 inop->inode.iso_mode |= VEXEC >> 3; 291 if (!(ap->perm[0]&1)) 292 inop->inode.iso_mode |= VREAD >> 3; 293 if (!(ap->perm[1]&0x40)) 294 inop->inode.iso_mode |= VEXEC; 295 if (!(ap->perm[1]&0x10)) 296 inop->inode.iso_mode |= VREAD; 297 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 298 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 299 } else 300 ap = NULL; 301 } 302 if (!ap) { 303 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 304 inop->inode.iso_uid = (uid_t)0; 305 inop->inode.iso_gid = (gid_t)0; 306 } 307 if (bp2) 308 brelse(bp2); 309 } 310 311 /* 312 * Time stamps 313 */ 314 void 315 cd9660_deftstamp(isodir,inop,bp) 316 struct iso_directory_record *isodir; 317 struct iso_node *inop; 318 struct buf *bp; 319 { 320 struct buf *bp2 = NULL; 321 struct iso_mnt *imp; 322 struct iso_extended_attributes *ap = NULL; 323 int off; 324 325 if (!bp 326 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 327 && (off = isonum_711(isodir->ext_attr_length))) { 328 VOP_BLKATOFF(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 329 &bp2); 330 bp = bp2; 331 } 332 if (bp) { 333 ap = (struct iso_extended_attributes *)bp->b_data; 334 335 if (isonum_711(ap->version) == 1) { 336 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 337 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 338 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 339 inop->inode.iso_ctime = inop->inode.iso_atime; 340 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 341 inop->inode.iso_mtime = inop->inode.iso_ctime; 342 } else 343 ap = NULL; 344 } 345 if (!ap) { 346 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 347 inop->inode.iso_atime = inop->inode.iso_ctime; 348 inop->inode.iso_mtime = inop->inode.iso_ctime; 349 } 350 if (bp2) 351 brelse(bp2); 352 } 353 354 int 355 cd9660_tstamp_conv7(pi,pu) 356 u_char *pi; 357 struct timespec *pu; 358 { 359 int i; 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->ts_sec = 0; 373 pu->ts_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->ts_sec = crtime; 394 pu->ts_nsec = 0; 395 return 1; 396 } 397 398 static u_int 399 cd9660_chars2ui(begin,len) 400 u_char *begin; 401 int len; 402 { 403 u_int rc; 404 405 for (rc = 0; --len >= 0;) { 406 rc *= 10; 407 rc += *begin++ - '0'; 408 } 409 return rc; 410 } 411 412 int 413 cd9660_tstamp_conv17(pi,pu) 414 u_char *pi; 415 struct timespec *pu; 416 { 417 u_char buf[7]; 418 419 /* year:"0001"-"9999" -> -1900 */ 420 buf[0] = cd9660_chars2ui(pi,4) - 1900; 421 422 /* month: " 1"-"12" -> 1 - 12 */ 423 buf[1] = cd9660_chars2ui(pi + 4,2); 424 425 /* day: " 1"-"31" -> 1 - 31 */ 426 buf[2] = cd9660_chars2ui(pi + 6,2); 427 428 /* hour: " 0"-"23" -> 0 - 23 */ 429 buf[3] = cd9660_chars2ui(pi + 8,2); 430 431 /* minute:" 0"-"59" -> 0 - 59 */ 432 buf[4] = cd9660_chars2ui(pi + 10,2); 433 434 /* second:" 0"-"59" -> 0 - 59 */ 435 buf[5] = cd9660_chars2ui(pi + 12,2); 436 437 /* difference of GMT */ 438 buf[6] = pi[16]; 439 440 return cd9660_tstamp_conv7(buf,pu); 441 } 442 443 ino_t 444 isodirino(isodir, imp) 445 struct iso_directory_record *isodir; 446 struct iso_mnt *imp; 447 { 448 ino_t ino; 449 450 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 451 << imp->im_bshift; 452 return (ino); 453 } 454