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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)cd9660_node.c 8.2 (Berkeley) 1/23/94 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/mount.h> 43 #include <sys/bio.h> 44 #include <sys/buf.h> 45 #include <sys/vnode.h> 46 #include <sys/malloc.h> 47 #include <sys/stat.h> 48 #include <sys/mutex.h> 49 50 #include <isofs/cd9660/iso.h> 51 #include <isofs/cd9660/cd9660_node.h> 52 #include <isofs/cd9660/cd9660_mount.h> 53 54 /* 55 * Structures associated with iso_node caching. 56 */ 57 static struct iso_node **isohashtbl; 58 static u_long isohash; 59 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash) 60 static struct mtx cd9660_ihash_mtx; 61 62 static void cd9660_ihashrem(struct iso_node *); 63 static unsigned cd9660_chars2ui(unsigned char *begin, int len); 64 65 /* 66 * Initialize hash links for inodes and dnodes. 67 */ 68 int 69 cd9660_init(vfsp) 70 struct vfsconf *vfsp; 71 { 72 73 isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash); 74 mtx_init(&cd9660_ihash_mtx, "cd9660_ihash", NULL, MTX_DEF); 75 return (0); 76 } 77 78 int 79 cd9660_uninit(vfsp) 80 struct vfsconf *vfsp; 81 { 82 83 if (isohashtbl != NULL) 84 free(isohashtbl, M_ISOFSMNT); 85 return (0); 86 } 87 88 89 /* 90 * Use the device/inum pair to find the incore inode, and return a pointer 91 * to it. If it is in core, but locked, wait for it. 92 */ 93 int 94 cd9660_ihashget(dev, inum, flags, vpp) 95 struct cdev *dev; 96 ino_t inum; 97 int flags; 98 struct vnode **vpp; 99 { 100 struct thread *td = curthread; /* XXX */ 101 struct iso_node *ip; 102 struct vnode *vp; 103 int error; 104 105 *vpp = NULL; 106 loop: 107 mtx_lock(&cd9660_ihash_mtx); 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 mtx_lock(&vp->v_interlock); 112 mtx_unlock(&cd9660_ihash_mtx); 113 error = vget(vp, flags | LK_INTERLOCK, td); 114 if (error == ENOENT) 115 goto loop; 116 if (error) 117 return (error); 118 *vpp = vp; 119 return (0); 120 } 121 } 122 mtx_unlock(&cd9660_ihash_mtx); 123 return (0); 124 } 125 126 /* 127 * Insert the inode into the hash table, and return it locked. 128 */ 129 void 130 cd9660_ihashins(ip) 131 struct iso_node *ip; 132 { 133 struct iso_node **ipp, *iq; 134 135 mtx_lock(&cd9660_ihash_mtx); 136 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 137 if ((iq = *ipp) != NULL) 138 iq->i_prev = &ip->i_next; 139 ip->i_next = iq; 140 ip->i_prev = ipp; 141 *ipp = ip; 142 mtx_unlock(&cd9660_ihash_mtx); 143 144 vn_lock(ITOV(ip), LK_EXCLUSIVE | LK_RETRY, curthread); 145 } 146 147 /* 148 * Remove the inode from the hash table. 149 */ 150 static void 151 cd9660_ihashrem(ip) 152 struct iso_node *ip; 153 { 154 struct iso_node *iq; 155 156 mtx_lock(&cd9660_ihash_mtx); 157 if ((iq = ip->i_next) != NULL) 158 iq->i_prev = ip->i_prev; 159 *ip->i_prev = iq; 160 #ifdef DIAGNOSTIC 161 ip->i_next = NULL; 162 ip->i_prev = NULL; 163 #endif 164 mtx_unlock(&cd9660_ihash_mtx); 165 } 166 167 /* 168 * Last reference to an inode, write the inode out and if necessary, 169 * truncate and deallocate the file. 170 */ 171 int 172 cd9660_inactive(ap) 173 struct vop_inactive_args /* { 174 struct vnode *a_vp; 175 struct thread *a_td; 176 } */ *ap; 177 { 178 struct vnode *vp = ap->a_vp; 179 struct thread *td = ap->a_td; 180 struct iso_node *ip = VTOI(vp); 181 int error = 0; 182 183 if (prtactive && vrefcnt(vp) != 0) 184 vprint("cd9660_inactive: pushing active", vp); 185 186 ip->i_flag = 0; 187 VOP_UNLOCK(vp, 0, td); 188 /* 189 * If we are done with the inode, reclaim it 190 * so that it can be reused immediately. 191 */ 192 if (ip->inode.iso_mode == 0) 193 vrecycle(vp, td); 194 return error; 195 } 196 197 /* 198 * Reclaim an inode so that it can be used for other purposes. 199 */ 200 int 201 cd9660_reclaim(ap) 202 struct vop_reclaim_args /* { 203 struct vnode *a_vp; 204 struct thread *a_td; 205 } */ *ap; 206 { 207 struct vnode *vp = ap->a_vp; 208 struct iso_node *ip = VTOI(vp); 209 210 if (prtactive && vrefcnt(vp) != 0) 211 vprint("cd9660_reclaim: pushing active", vp); 212 /* 213 * Remove the inode from its hash chain. 214 */ 215 cd9660_ihashrem(ip); 216 /* 217 * Purge old data structures associated with the inode. 218 */ 219 if (ip->i_mnt->im_devvp) 220 vrele(ip->i_mnt->im_devvp); 221 FREE(vp->v_data, M_ISOFSNODE); 222 vp->v_data = NULL; 223 vnode_destroy_vobject(vp); 224 return (0); 225 } 226 227 /* 228 * File attributes 229 */ 230 void 231 cd9660_defattr(isodir, inop, bp, ftype) 232 struct iso_directory_record *isodir; 233 struct iso_node *inop; 234 struct buf *bp; 235 enum ISO_FTYPE ftype; 236 { 237 struct buf *bp2 = NULL; 238 struct iso_mnt *imp; 239 struct iso_extended_attributes *ap = NULL; 240 int off; 241 242 /* high sierra does not have timezone data, flag is one byte ahead */ 243 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 244 &isodir->date[6]: isodir->flags)&2) { 245 inop->inode.iso_mode = S_IFDIR; 246 /* 247 * If we return 2, fts() will assume there are no subdirectories 248 * (just links for the path and .), so instead we return 1. 249 */ 250 inop->inode.iso_links = 1; 251 } else { 252 inop->inode.iso_mode = S_IFREG; 253 inop->inode.iso_links = 1; 254 } 255 if (!bp 256 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 257 && (off = isonum_711(isodir->ext_attr_length))) { 258 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 259 &bp2); 260 bp = bp2; 261 } 262 if (bp) { 263 ap = (struct iso_extended_attributes *)bp->b_data; 264 265 if (isonum_711(ap->version) == 1) { 266 if (!(ap->perm[0]&0x40)) 267 inop->inode.iso_mode |= VEXEC >> 6; 268 if (!(ap->perm[0]&0x10)) 269 inop->inode.iso_mode |= VREAD >> 6; 270 if (!(ap->perm[0]&4)) 271 inop->inode.iso_mode |= VEXEC >> 3; 272 if (!(ap->perm[0]&1)) 273 inop->inode.iso_mode |= VREAD >> 3; 274 if (!(ap->perm[1]&0x40)) 275 inop->inode.iso_mode |= VEXEC; 276 if (!(ap->perm[1]&0x10)) 277 inop->inode.iso_mode |= VREAD; 278 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 279 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 280 } else 281 ap = NULL; 282 } 283 if (!ap) { 284 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 285 inop->inode.iso_uid = (uid_t)0; 286 inop->inode.iso_gid = (gid_t)0; 287 } 288 if (bp2) 289 brelse(bp2); 290 } 291 292 /* 293 * Time stamps 294 */ 295 void 296 cd9660_deftstamp(isodir,inop,bp,ftype) 297 struct iso_directory_record *isodir; 298 struct iso_node *inop; 299 struct buf *bp; 300 enum ISO_FTYPE ftype; 301 { 302 struct buf *bp2 = NULL; 303 struct iso_mnt *imp; 304 struct iso_extended_attributes *ap = NULL; 305 int off; 306 307 if (!bp 308 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 309 && (off = isonum_711(isodir->ext_attr_length))) { 310 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 311 &bp2); 312 bp = bp2; 313 } 314 if (bp) { 315 ap = (struct iso_extended_attributes *)bp->b_data; 316 317 if (ftype != ISO_FTYPE_HIGH_SIERRA 318 && isonum_711(ap->version) == 1) { 319 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 320 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 321 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 322 inop->inode.iso_ctime = inop->inode.iso_atime; 323 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 324 inop->inode.iso_mtime = inop->inode.iso_ctime; 325 } else 326 ap = NULL; 327 } 328 if (!ap) { 329 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 330 inop->inode.iso_atime = inop->inode.iso_ctime; 331 inop->inode.iso_mtime = inop->inode.iso_ctime; 332 } 333 if (bp2) 334 brelse(bp2); 335 } 336 337 int 338 cd9660_tstamp_conv7(pi,pu,ftype) 339 u_char *pi; 340 struct timespec *pu; 341 enum ISO_FTYPE ftype; 342 { 343 int crtime, days; 344 int y, m, d, hour, minute, second, tz; 345 346 y = pi[0] + 1900; 347 m = pi[1]; 348 d = pi[2]; 349 hour = pi[3]; 350 minute = pi[4]; 351 second = pi[5]; 352 if(ftype != ISO_FTYPE_HIGH_SIERRA) 353 tz = pi[6]; 354 else 355 /* original high sierra misses timezone data */ 356 tz = 0; 357 358 if (y < 1970) { 359 pu->tv_sec = 0; 360 pu->tv_nsec = 0; 361 return 0; 362 } else { 363 #ifdef ORIGINAL 364 /* computes day number relative to Sept. 19th,1989 */ 365 /* don't even *THINK* about changing formula. It works! */ 366 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 367 #else 368 /* 369 * Changed :-) to make it relative to Jan. 1st, 1970 370 * and to disambiguate negative division 371 */ 372 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 373 #endif 374 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 375 376 /* timezone offset is unreliable on some disks */ 377 if (-48 <= tz && tz <= 52) 378 crtime -= tz * 15 * 60; 379 } 380 pu->tv_sec = crtime; 381 pu->tv_nsec = 0; 382 return 1; 383 } 384 385 static u_int 386 cd9660_chars2ui(begin,len) 387 u_char *begin; 388 int len; 389 { 390 u_int rc; 391 392 for (rc = 0; --len >= 0;) { 393 rc *= 10; 394 rc += *begin++ - '0'; 395 } 396 return rc; 397 } 398 399 int 400 cd9660_tstamp_conv17(pi,pu) 401 u_char *pi; 402 struct timespec *pu; 403 { 404 u_char buf[7]; 405 406 /* year:"0001"-"9999" -> -1900 */ 407 buf[0] = cd9660_chars2ui(pi,4) - 1900; 408 409 /* month: " 1"-"12" -> 1 - 12 */ 410 buf[1] = cd9660_chars2ui(pi + 4,2); 411 412 /* day: " 1"-"31" -> 1 - 31 */ 413 buf[2] = cd9660_chars2ui(pi + 6,2); 414 415 /* hour: " 0"-"23" -> 0 - 23 */ 416 buf[3] = cd9660_chars2ui(pi + 8,2); 417 418 /* minute:" 0"-"59" -> 0 - 59 */ 419 buf[4] = cd9660_chars2ui(pi + 10,2); 420 421 /* second:" 0"-"59" -> 0 - 59 */ 422 buf[5] = cd9660_chars2ui(pi + 12,2); 423 424 /* difference of GMT */ 425 buf[6] = pi[16]; 426 427 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 428 } 429 430 ino_t 431 isodirino(isodir, imp) 432 struct iso_directory_record *isodir; 433 struct iso_mnt *imp; 434 { 435 ino_t ino; 436 437 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 438 << imp->im_bshift; 439 return (ino); 440 } 441