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