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 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 * 38 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94 39 * $FreeBSD: src/sys/isofs/cd9660/cd9660_node.c,v 1.29.2.1 2000/07/08 14:35:56 bp Exp $ 40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.2 2003/06/17 04:28:41 dillon Exp $ 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mount.h> 46 #include <sys/proc.h> 47 #include <sys/buf.h> 48 #include <sys/vnode.h> 49 #include <sys/malloc.h> 50 #include <sys/stat.h> 51 52 #include <isofs/cd9660/iso.h> 53 #include <isofs/cd9660/cd9660_node.h> 54 #include <isofs/cd9660/cd9660_mount.h> 55 56 /* 57 * Structures associated with iso_node caching. 58 */ 59 static struct iso_node **isohashtbl; 60 static u_long isohash; 61 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash) 62 #ifndef NULL_SIMPLELOCKS 63 static struct simplelock cd9660_ihash_slock; 64 #endif 65 66 static void cd9660_ihashrem __P((struct iso_node *)); 67 static unsigned cd9660_chars2ui __P((unsigned char *begin, int len)); 68 69 /* 70 * Initialize hash links for inodes and dnodes. 71 */ 72 int 73 cd9660_init(vfsp) 74 struct vfsconf *vfsp; 75 { 76 77 isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash); 78 simple_lock_init(&cd9660_ihash_slock); 79 return (0); 80 } 81 82 int 83 cd9660_uninit(vfsp) 84 struct vfsconf *vfsp; 85 { 86 87 if (isohashtbl != NULL) 88 free(isohashtbl, M_ISOFSMNT); 89 return (0); 90 } 91 92 93 /* 94 * Use the device/inum pair to find the incore inode, and return a pointer 95 * to it. If it is in core, but locked, wait for it. 96 */ 97 struct vnode * 98 cd9660_ihashget(dev, inum) 99 dev_t dev; 100 ino_t inum; 101 { 102 struct proc *p = curproc; /* XXX */ 103 struct iso_node *ip; 104 struct vnode *vp; 105 106 loop: 107 simple_lock(&cd9660_ihash_slock); 108 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 109 if (inum == ip->i_number && dev == ip->i_dev) { 110 vp = ITOV(ip); 111 simple_lock(&vp->v_interlock); 112 simple_unlock(&cd9660_ihash_slock); 113 if (vget(vp, LK_EXCLUSIVE | LK_INTERLOCK, p)) 114 goto loop; 115 return (vp); 116 } 117 } 118 simple_unlock(&cd9660_ihash_slock); 119 return (NULL); 120 } 121 122 /* 123 * Insert the inode into the hash table, and return it locked. 124 */ 125 void 126 cd9660_ihashins(ip) 127 struct iso_node *ip; 128 { 129 struct proc *p = curproc; /* XXX */ 130 struct iso_node **ipp, *iq; 131 132 simple_lock(&cd9660_ihash_slock); 133 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 134 if ((iq = *ipp) != NULL) 135 iq->i_prev = &ip->i_next; 136 ip->i_next = iq; 137 ip->i_prev = ipp; 138 *ipp = ip; 139 simple_unlock(&cd9660_ihash_slock); 140 141 lockmgr(&ip->i_lock, LK_EXCLUSIVE, (struct simplelock *)0, p); 142 } 143 144 /* 145 * Remove the inode from the hash table. 146 */ 147 static void 148 cd9660_ihashrem(ip) 149 register struct iso_node *ip; 150 { 151 register struct iso_node *iq; 152 153 simple_lock(&cd9660_ihash_slock); 154 if ((iq = ip->i_next) != NULL) 155 iq->i_prev = ip->i_prev; 156 *ip->i_prev = iq; 157 #ifdef DIAGNOSTIC 158 ip->i_next = NULL; 159 ip->i_prev = NULL; 160 #endif 161 simple_unlock(&cd9660_ihash_slock); 162 } 163 164 /* 165 * Last reference to an inode, write the inode out and if necessary, 166 * truncate and deallocate the file. 167 */ 168 int 169 cd9660_inactive(ap) 170 struct vop_inactive_args /* { 171 struct vnode *a_vp; 172 struct proc *a_p; 173 } */ *ap; 174 { 175 struct vnode *vp = ap->a_vp; 176 struct proc *p = ap->a_p; 177 register struct iso_node *ip = VTOI(vp); 178 int error = 0; 179 180 if (prtactive && vp->v_usecount != 0) 181 vprint("cd9660_inactive: pushing active", vp); 182 183 ip->i_flag = 0; 184 VOP_UNLOCK(vp, 0, p); 185 /* 186 * If we are done with the inode, reclaim it 187 * so that it can be reused immediately. 188 */ 189 if (ip->inode.iso_mode == 0) 190 vrecycle(vp, (struct simplelock *)0, p); 191 return error; 192 } 193 194 /* 195 * Reclaim an inode so that it can be used for other purposes. 196 */ 197 int 198 cd9660_reclaim(ap) 199 struct vop_reclaim_args /* { 200 struct vnode *a_vp; 201 struct proc *a_p; 202 } */ *ap; 203 { 204 register struct vnode *vp = ap->a_vp; 205 register struct iso_node *ip = VTOI(vp); 206 207 if (prtactive && vp->v_usecount != 0) 208 vprint("cd9660_reclaim: pushing active", vp); 209 /* 210 * Remove the inode from its hash chain. 211 */ 212 cd9660_ihashrem(ip); 213 /* 214 * Purge old data structures associated with the inode. 215 */ 216 cache_purge(vp); 217 if (ip->i_devvp) { 218 vrele(ip->i_devvp); 219 ip->i_devvp = 0; 220 } 221 FREE(vp->v_data, M_ISOFSNODE); 222 vp->v_data = NULL; 223 return (0); 224 } 225 226 /* 227 * File attributes 228 */ 229 void 230 cd9660_defattr(isodir, inop, bp, ftype) 231 struct iso_directory_record *isodir; 232 struct iso_node *inop; 233 struct buf *bp; 234 enum ISO_FTYPE ftype; 235 { 236 struct buf *bp2 = NULL; 237 struct iso_mnt *imp; 238 struct iso_extended_attributes *ap = NULL; 239 int off; 240 241 /* high sierra does not have timezone data, flag is one byte ahead */ 242 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 243 &isodir->date[6]: isodir->flags)&2) { 244 inop->inode.iso_mode = S_IFDIR; 245 /* 246 * If we return 2, fts() will assume there are no subdirectories 247 * (just links for the path and .), so instead we return 1. 248 */ 249 inop->inode.iso_links = 1; 250 } else { 251 inop->inode.iso_mode = S_IFREG; 252 inop->inode.iso_links = 1; 253 } 254 if (!bp 255 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 256 && (off = isonum_711(isodir->ext_attr_length))) { 257 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 258 &bp2); 259 bp = bp2; 260 } 261 if (bp) { 262 ap = (struct iso_extended_attributes *)bp->b_data; 263 264 if (isonum_711(ap->version) == 1) { 265 if (!(ap->perm[0]&0x40)) 266 inop->inode.iso_mode |= VEXEC >> 6; 267 if (!(ap->perm[0]&0x10)) 268 inop->inode.iso_mode |= VREAD >> 6; 269 if (!(ap->perm[0]&4)) 270 inop->inode.iso_mode |= VEXEC >> 3; 271 if (!(ap->perm[0]&1)) 272 inop->inode.iso_mode |= VREAD >> 3; 273 if (!(ap->perm[1]&0x40)) 274 inop->inode.iso_mode |= VEXEC; 275 if (!(ap->perm[1]&0x10)) 276 inop->inode.iso_mode |= VREAD; 277 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 278 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 279 } else 280 ap = NULL; 281 } 282 if (!ap) { 283 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 284 inop->inode.iso_uid = (uid_t)0; 285 inop->inode.iso_gid = (gid_t)0; 286 } 287 if (bp2) 288 brelse(bp2); 289 } 290 291 /* 292 * Time stamps 293 */ 294 void 295 cd9660_deftstamp(isodir,inop,bp,ftype) 296 struct iso_directory_record *isodir; 297 struct iso_node *inop; 298 struct buf *bp; 299 enum ISO_FTYPE ftype; 300 { 301 struct buf *bp2 = NULL; 302 struct iso_mnt *imp; 303 struct iso_extended_attributes *ap = NULL; 304 int off; 305 306 if (!bp 307 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 308 && (off = isonum_711(isodir->ext_attr_length))) { 309 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 310 &bp2); 311 bp = bp2; 312 } 313 if (bp) { 314 ap = (struct iso_extended_attributes *)bp->b_data; 315 316 if (ftype != ISO_FTYPE_HIGH_SIERRA 317 && isonum_711(ap->version) == 1) { 318 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 319 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 320 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 321 inop->inode.iso_ctime = inop->inode.iso_atime; 322 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 323 inop->inode.iso_mtime = inop->inode.iso_ctime; 324 } else 325 ap = NULL; 326 } 327 if (!ap) { 328 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 329 inop->inode.iso_atime = inop->inode.iso_ctime; 330 inop->inode.iso_mtime = inop->inode.iso_ctime; 331 } 332 if (bp2) 333 brelse(bp2); 334 } 335 336 int 337 cd9660_tstamp_conv7(pi,pu,ftype) 338 u_char *pi; 339 struct timespec *pu; 340 enum ISO_FTYPE ftype; 341 { 342 int crtime, days; 343 int y, m, d, hour, minute, second, tz; 344 345 y = pi[0] + 1900; 346 m = pi[1]; 347 d = pi[2]; 348 hour = pi[3]; 349 minute = pi[4]; 350 second = pi[5]; 351 if(ftype != ISO_FTYPE_HIGH_SIERRA) 352 tz = pi[6]; 353 else 354 /* original high sierra misses timezone data */ 355 tz = 0; 356 357 if (y < 1970) { 358 pu->tv_sec = 0; 359 pu->tv_nsec = 0; 360 return 0; 361 } else { 362 #ifdef ORIGINAL 363 /* computes day number relative to Sept. 19th,1989 */ 364 /* don't even *THINK* about changing formula. It works! */ 365 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 366 #else 367 /* 368 * Changed :-) to make it relative to Jan. 1st, 1970 369 * and to disambiguate negative division 370 */ 371 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 372 #endif 373 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 374 375 /* timezone offset is unreliable on some disks */ 376 if (-48 <= tz && tz <= 52) 377 crtime -= tz * 15 * 60; 378 } 379 pu->tv_sec = crtime; 380 pu->tv_nsec = 0; 381 return 1; 382 } 383 384 static u_int 385 cd9660_chars2ui(begin,len) 386 u_char *begin; 387 int len; 388 { 389 u_int rc; 390 391 for (rc = 0; --len >= 0;) { 392 rc *= 10; 393 rc += *begin++ - '0'; 394 } 395 return rc; 396 } 397 398 int 399 cd9660_tstamp_conv17(pi,pu) 400 u_char *pi; 401 struct timespec *pu; 402 { 403 u_char buf[7]; 404 405 /* year:"0001"-"9999" -> -1900 */ 406 buf[0] = cd9660_chars2ui(pi,4) - 1900; 407 408 /* month: " 1"-"12" -> 1 - 12 */ 409 buf[1] = cd9660_chars2ui(pi + 4,2); 410 411 /* day: " 1"-"31" -> 1 - 31 */ 412 buf[2] = cd9660_chars2ui(pi + 6,2); 413 414 /* hour: " 0"-"23" -> 0 - 23 */ 415 buf[3] = cd9660_chars2ui(pi + 8,2); 416 417 /* minute:" 0"-"59" -> 0 - 59 */ 418 buf[4] = cd9660_chars2ui(pi + 10,2); 419 420 /* second:" 0"-"59" -> 0 - 59 */ 421 buf[5] = cd9660_chars2ui(pi + 12,2); 422 423 /* difference of GMT */ 424 buf[6] = pi[16]; 425 426 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 427 } 428 429 ino_t 430 isodirino(isodir, imp) 431 struct iso_directory_record *isodir; 432 struct iso_mnt *imp; 433 { 434 ino_t ino; 435 436 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 437 << imp->im_bshift; 438 return (ino); 439 } 440