Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/isofs/cd9660/cd9660_node.c
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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 */ 40 41 #include <sys/cdefs.h> 42 __FBSDID("$FreeBSD: releng/5.2/sys/isofs/cd9660/cd9660_node.c 120778 2003-10-05 02:45:36Z jeff $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/mount.h> 47 #include <sys/bio.h> 48 #include <sys/buf.h> 49 #include <sys/vnode.h> 50 #include <sys/malloc.h> 51 #include <sys/stat.h> 52 #include <sys/mutex.h> 53 54 #include <isofs/cd9660/iso.h> 55 #include <isofs/cd9660/cd9660_node.h> 56 #include <isofs/cd9660/cd9660_mount.h> 57 58 /* 59 * Structures associated with iso_node caching. 60 */ 61 static struct iso_node **isohashtbl; 62 static u_long isohash; 63 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash) 64 static struct mtx cd9660_ihash_mtx; 65 66 static void cd9660_ihashrem(struct iso_node *); 67 static unsigned cd9660_chars2ui(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 mtx_init(&cd9660_ihash_mtx, "cd9660_ihash", NULL, MTX_DEF); 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 int 98 cd9660_ihashget(dev, inum, flags, vpp) 99 dev_t dev; 100 ino_t inum; 101 int flags; 102 struct vnode **vpp; 103 { 104 struct thread *td = curthread; /* XXX */ 105 struct iso_node *ip; 106 struct vnode *vp; 107 int error; 108 109 *vpp = NULL; 110 loop: 111 mtx_lock(&cd9660_ihash_mtx); 112 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 113 if (inum == ip->i_number && dev == ip->i_dev) { 114 vp = ITOV(ip); 115 mtx_lock(&vp->v_interlock); 116 mtx_unlock(&cd9660_ihash_mtx); 117 error = vget(vp, flags | LK_INTERLOCK, td); 118 if (error == ENOENT) 119 goto loop; 120 if (error) 121 return (error); 122 *vpp = vp; 123 return (0); 124 } 125 } 126 mtx_unlock(&cd9660_ihash_mtx); 127 return (0); 128 } 129 130 /* 131 * Insert the inode into the hash table, and return it locked. 132 */ 133 void 134 cd9660_ihashins(ip) 135 struct iso_node *ip; 136 { 137 struct iso_node **ipp, *iq; 138 139 mtx_lock(&cd9660_ihash_mtx); 140 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 141 if ((iq = *ipp) != NULL) 142 iq->i_prev = &ip->i_next; 143 ip->i_next = iq; 144 ip->i_prev = ipp; 145 *ipp = ip; 146 mtx_unlock(&cd9660_ihash_mtx); 147 148 vn_lock(ITOV(ip), LK_EXCLUSIVE | LK_RETRY, curthread); 149 } 150 151 /* 152 * Remove the inode from the hash table. 153 */ 154 static void 155 cd9660_ihashrem(ip) 156 register struct iso_node *ip; 157 { 158 register struct iso_node *iq; 159 160 mtx_lock(&cd9660_ihash_mtx); 161 if ((iq = ip->i_next) != NULL) 162 iq->i_prev = ip->i_prev; 163 *ip->i_prev = iq; 164 #ifdef DIAGNOSTIC 165 ip->i_next = NULL; 166 ip->i_prev = NULL; 167 #endif 168 mtx_unlock(&cd9660_ihash_mtx); 169 } 170 171 /* 172 * Last reference to an inode, write the inode out and if necessary, 173 * truncate and deallocate the file. 174 */ 175 int 176 cd9660_inactive(ap) 177 struct vop_inactive_args /* { 178 struct vnode *a_vp; 179 struct thread *a_td; 180 } */ *ap; 181 { 182 struct vnode *vp = ap->a_vp; 183 struct thread *td = ap->a_td; 184 register struct iso_node *ip = VTOI(vp); 185 int error = 0; 186 187 if (prtactive && vrefcnt(vp) != 0) 188 vprint("cd9660_inactive: pushing active", vp); 189 190 ip->i_flag = 0; 191 VOP_UNLOCK(vp, 0, td); 192 /* 193 * If we are done with the inode, reclaim it 194 * so that it can be reused immediately. 195 */ 196 if (ip->inode.iso_mode == 0) 197 vrecycle(vp, NULL, td); 198 return error; 199 } 200 201 /* 202 * Reclaim an inode so that it can be used for other purposes. 203 */ 204 int 205 cd9660_reclaim(ap) 206 struct vop_reclaim_args /* { 207 struct vnode *a_vp; 208 struct thread *a_td; 209 } */ *ap; 210 { 211 register struct vnode *vp = ap->a_vp; 212 register struct iso_node *ip = VTOI(vp); 213 214 if (prtactive && vrefcnt(vp) != 0) 215 vprint("cd9660_reclaim: pushing active", vp); 216 /* 217 * Remove the inode from its hash chain. 218 */ 219 cd9660_ihashrem(ip); 220 /* 221 * Purge old data structures associated with the inode. 222 */ 223 if (ip->i_devvp) { 224 vrele(ip->i_devvp); 225 ip->i_devvp = 0; 226 } 227 FREE(vp->v_data, M_ISOFSNODE); 228 vp->v_data = NULL; 229 return (0); 230 } 231 232 /* 233 * File attributes 234 */ 235 void 236 cd9660_defattr(isodir, inop, bp, ftype) 237 struct iso_directory_record *isodir; 238 struct iso_node *inop; 239 struct buf *bp; 240 enum ISO_FTYPE ftype; 241 { 242 struct buf *bp2 = NULL; 243 struct iso_mnt *imp; 244 struct iso_extended_attributes *ap = NULL; 245 int off; 246 247 /* high sierra does not have timezone data, flag is one byte ahead */ 248 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 249 &isodir->date[6]: isodir->flags)&2) { 250 inop->inode.iso_mode = S_IFDIR; 251 /* 252 * If we return 2, fts() will assume there are no subdirectories 253 * (just links for the path and .), so instead we return 1. 254 */ 255 inop->inode.iso_links = 1; 256 } else { 257 inop->inode.iso_mode = S_IFREG; 258 inop->inode.iso_links = 1; 259 } 260 if (!bp 261 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 262 && (off = isonum_711(isodir->ext_attr_length))) { 263 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 264 &bp2); 265 bp = bp2; 266 } 267 if (bp) { 268 ap = (struct iso_extended_attributes *)bp->b_data; 269 270 if (isonum_711(ap->version) == 1) { 271 if (!(ap->perm[0]&0x40)) 272 inop->inode.iso_mode |= VEXEC >> 6; 273 if (!(ap->perm[0]&0x10)) 274 inop->inode.iso_mode |= VREAD >> 6; 275 if (!(ap->perm[0]&4)) 276 inop->inode.iso_mode |= VEXEC >> 3; 277 if (!(ap->perm[0]&1)) 278 inop->inode.iso_mode |= VREAD >> 3; 279 if (!(ap->perm[1]&0x40)) 280 inop->inode.iso_mode |= VEXEC; 281 if (!(ap->perm[1]&0x10)) 282 inop->inode.iso_mode |= VREAD; 283 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 284 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 285 } else 286 ap = NULL; 287 } 288 if (!ap) { 289 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 290 inop->inode.iso_uid = (uid_t)0; 291 inop->inode.iso_gid = (gid_t)0; 292 } 293 if (bp2) 294 brelse(bp2); 295 } 296 297 /* 298 * Time stamps 299 */ 300 void 301 cd9660_deftstamp(isodir,inop,bp,ftype) 302 struct iso_directory_record *isodir; 303 struct iso_node *inop; 304 struct buf *bp; 305 enum ISO_FTYPE ftype; 306 { 307 struct buf *bp2 = NULL; 308 struct iso_mnt *imp; 309 struct iso_extended_attributes *ap = NULL; 310 int off; 311 312 if (!bp 313 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 314 && (off = isonum_711(isodir->ext_attr_length))) { 315 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 316 &bp2); 317 bp = bp2; 318 } 319 if (bp) { 320 ap = (struct iso_extended_attributes *)bp->b_data; 321 322 if (ftype != ISO_FTYPE_HIGH_SIERRA 323 && isonum_711(ap->version) == 1) { 324 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 325 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 326 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 327 inop->inode.iso_ctime = inop->inode.iso_atime; 328 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 329 inop->inode.iso_mtime = inop->inode.iso_ctime; 330 } else 331 ap = NULL; 332 } 333 if (!ap) { 334 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 335 inop->inode.iso_atime = inop->inode.iso_ctime; 336 inop->inode.iso_mtime = inop->inode.iso_ctime; 337 } 338 if (bp2) 339 brelse(bp2); 340 } 341 342 int 343 cd9660_tstamp_conv7(pi,pu,ftype) 344 u_char *pi; 345 struct timespec *pu; 346 enum ISO_FTYPE ftype; 347 { 348 int crtime, days; 349 int y, m, d, hour, minute, second, tz; 350 351 y = pi[0] + 1900; 352 m = pi[1]; 353 d = pi[2]; 354 hour = pi[3]; 355 minute = pi[4]; 356 second = pi[5]; 357 if(ftype != ISO_FTYPE_HIGH_SIERRA) 358 tz = pi[6]; 359 else 360 /* original high sierra misses timezone data */ 361 tz = 0; 362 363 if (y < 1970) { 364 pu->tv_sec = 0; 365 pu->tv_nsec = 0; 366 return 0; 367 } else { 368 #ifdef ORIGINAL 369 /* computes day number relative to Sept. 19th,1989 */ 370 /* don't even *THINK* about changing formula. It works! */ 371 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 372 #else 373 /* 374 * Changed :-) to make it relative to Jan. 1st, 1970 375 * and to disambiguate negative division 376 */ 377 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 378 #endif 379 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 380 381 /* timezone offset is unreliable on some disks */ 382 if (-48 <= tz && tz <= 52) 383 crtime -= tz * 15 * 60; 384 } 385 pu->tv_sec = crtime; 386 pu->tv_nsec = 0; 387 return 1; 388 } 389 390 static u_int 391 cd9660_chars2ui(begin,len) 392 u_char *begin; 393 int len; 394 { 395 u_int rc; 396 397 for (rc = 0; --len >= 0;) { 398 rc *= 10; 399 rc += *begin++ - ''; 400 } 401 return rc; 402 } 403 404 int 405 cd9660_tstamp_conv17(pi,pu) 406 u_char *pi; 407 struct timespec *pu; 408 { 409 u_char buf[7]; 410 411 /* year:"0001"-"9999" -> -1900 */ 412 buf[0] = cd9660_chars2ui(pi,4) - 1900; 413 414 /* month: " 1"-"12" -> 1 - 12 */ 415 buf[1] = cd9660_chars2ui(pi + 4,2); 416 417 /* day: " 1"-"31" -> 1 - 31 */ 418 buf[2] = cd9660_chars2ui(pi + 6,2); 419 420 /* hour: " 0"-"23" -> 0 - 23 */ 421 buf[3] = cd9660_chars2ui(pi + 8,2); 422 423 /* minute:" 0"-"59" -> 0 - 59 */ 424 buf[4] = cd9660_chars2ui(pi + 10,2); 425 426 /* second:" 0"-"59" -> 0 - 59 */ 427 buf[5] = cd9660_chars2ui(pi + 12,2); 428 429 /* difference of GMT */ 430 buf[6] = pi[16]; 431 432 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 433 } 434 435 ino_t 436 isodirino(isodir, imp) 437 struct iso_directory_record *isodir; 438 struct iso_mnt *imp; 439 { 440 ino_t ino; 441 442 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 443 << imp->im_bshift; 444 return (ino); 445 }
Cache object: 17dd7b49ad4bd43c7d602825c81a4078
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