1 /* $OpenBSD: cd9660_node.c,v 1.24 2014/07/12 18:50:00 tedu Exp $ */ 2 /* $NetBSD: cd9660_node.c,v 1.17 1997/05/05 07:13:57 mycroft Exp $ */ 3 4 /*- 5 * Copyright (c) 1982, 1986, 1989, 1994 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley 9 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 10 * Support code is derived from software contributed to Berkeley 11 * by Atsushi Murai (amurai@spec.co.jp). 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. Neither the name of the University nor the names of its contributors 22 * may be used to endorse or promote products derived from this software 23 * without specific prior written permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * @(#)cd9660_node.c 8.5 (Berkeley) 12/5/94 38 */ 39 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/mount.h> 43 #include <sys/proc.h> 44 #include <sys/file.h> 45 #include <sys/buf.h> 46 #include <sys/vnode.h> 47 #include <sys/namei.h> 48 #include <sys/kernel.h> 49 #include <sys/malloc.h> 50 #include <sys/stat.h> 51 52 #include <isofs/cd9660/iso.h> 53 #include <isofs/cd9660/cd9660_extern.h> 54 #include <isofs/cd9660/cd9660_node.h> 55 #include <isofs/cd9660/iso_rrip.h> 56 57 /* 58 * Structures associated with iso_node caching. 59 */ 60 struct iso_node **isohashtbl; 61 u_long isohash; 62 #define INOHASH(device, inum) (((device) + ((inum)>>12)) & isohash) 63 64 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 65 66 static u_int cd9660_chars2ui(u_char *, int); 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, M_WAITOK, &isohash); 77 return (0); 78 } 79 80 /* 81 * Use the device/inum pair to find the incore inode, and return a pointer 82 * to it. If it is in core, but locked, wait for it. 83 */ 84 struct vnode * 85 cd9660_ihashget(dev, inum) 86 dev_t dev; 87 cdino_t inum; 88 { 89 struct proc *p = curproc; /* XXX */ 90 struct iso_node *ip; 91 struct vnode *vp; 92 93 loop: 94 /* XXX locking lock hash list? */ 95 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 96 if (inum == ip->i_number && dev == ip->i_dev) { 97 vp = ITOV(ip); 98 /* XXX locking unlock hash list? */ 99 if (vget(vp, LK_EXCLUSIVE, p)) 100 goto loop; 101 return (vp); 102 } 103 } 104 /* XXX locking unlock hash list? */ 105 return (NULL); 106 } 107 108 /* 109 * Insert the inode into the hash table, and return it locked. 110 */ 111 int 112 cd9660_ihashins(ip) 113 struct iso_node *ip; 114 { 115 struct iso_node **ipp, *iq; 116 117 /* XXX locking lock hash list? */ 118 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 119 120 for (iq = *ipp; iq; iq = iq->i_next) { 121 if (iq->i_dev == ip->i_dev && 122 iq->i_number == ip->i_number) 123 return (EEXIST); 124 } 125 126 if ((iq = *ipp) != NULL) 127 iq->i_prev = &ip->i_next; 128 ip->i_next = iq; 129 ip->i_prev = ipp; 130 *ipp = ip; 131 /* XXX locking unlock hash list? */ 132 133 lockmgr(&ip->i_lock, LK_EXCLUSIVE, NULL); 134 135 return (0); 136 } 137 138 /* 139 * Remove the inode from the hash table. 140 */ 141 void 142 cd9660_ihashrem(ip) 143 register struct iso_node *ip; 144 { 145 register struct iso_node *iq; 146 147 if (ip->i_prev == NULL) 148 return; 149 150 /* XXX locking lock hash list? */ 151 if ((iq = ip->i_next) != NULL) 152 iq->i_prev = ip->i_prev; 153 *ip->i_prev = iq; 154 #ifdef DIAGNOSTIC 155 ip->i_next = NULL; 156 ip->i_prev = NULL; 157 #endif 158 /* XXX locking unlock hash list? */ 159 } 160 161 /* 162 * Last reference to an inode, write the inode out and if necessary, 163 * truncate and deallocate the file. 164 */ 165 int 166 cd9660_inactive(v) 167 void *v; 168 { 169 struct vop_inactive_args *ap = v; 170 struct vnode *vp = ap->a_vp; 171 struct proc *p = ap->a_p; 172 register struct iso_node *ip = VTOI(vp); 173 int error = 0; 174 175 #ifdef DIAGNOSTIC 176 if (prtactive && vp->v_usecount != 0) 177 vprint("cd9660_inactive: pushing active", vp); 178 #endif 179 180 ip->i_flag = 0; 181 VOP_UNLOCK(vp, 0, p); 182 /* 183 * If we are done with the inode, reclaim it 184 * so that it can be reused immediately. 185 */ 186 if (ip->inode.iso_mode == 0) 187 vrecycle(vp, p); 188 189 return (error); 190 } 191 192 /* 193 * Reclaim an inode so that it can be used for other purposes. 194 */ 195 int 196 cd9660_reclaim(v) 197 void *v; 198 { 199 struct vop_reclaim_args *ap = v; 200 register struct vnode *vp = ap->a_vp; 201 register struct iso_node *ip = VTOI(vp); 202 203 #ifdef DIAGNOSTIC 204 if (prtactive && vp->v_usecount != 0) 205 vprint("cd9660_reclaim: pushing active", vp); 206 #endif 207 208 /* 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, 0); 221 vp->v_data = NULL; 222 return (0); 223 } 224 225 /* 226 * File attributes 227 */ 228 void 229 cd9660_defattr(isodir, inop, bp) 230 struct iso_directory_record *isodir; 231 struct iso_node *inop; 232 struct buf *bp; 233 { 234 struct buf *bp2 = NULL; 235 struct iso_mnt *imp; 236 struct iso_extended_attributes *ap = NULL; 237 int off; 238 239 if (isonum_711(isodir->flags)&2) { 240 inop->inode.iso_mode = S_IFDIR; 241 /* 242 * If we return 2, fts() will assume there are no subdirectories 243 * (just links for the path and .), so instead we return 1. 244 */ 245 inop->inode.iso_links = 1; 246 } else { 247 inop->inode.iso_mode = S_IFREG; 248 inop->inode.iso_links = 1; 249 } 250 if (!bp 251 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 252 && (off = isonum_711(isodir->ext_attr_length))) { 253 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL, 254 &bp2); 255 bp = bp2; 256 } 257 if (bp) { 258 ap = (struct iso_extended_attributes *)bp->b_data; 259 260 if (isonum_711(ap->version) == 1) { 261 if (!(ap->perm[1]&0x10)) 262 inop->inode.iso_mode |= S_IRUSR; 263 if (!(ap->perm[1]&0x40)) 264 inop->inode.iso_mode |= S_IXUSR; 265 if (!(ap->perm[0]&0x01)) 266 inop->inode.iso_mode |= S_IRGRP; 267 if (!(ap->perm[0]&0x04)) 268 inop->inode.iso_mode |= S_IXGRP; 269 if (!(ap->perm[0]&0x10)) 270 inop->inode.iso_mode |= S_IROTH; 271 if (!(ap->perm[0]&0x40)) 272 inop->inode.iso_mode |= S_IXOTH; 273 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 274 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 275 } else 276 ap = NULL; 277 } 278 if (!ap) { 279 inop->inode.iso_mode |= 280 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 281 inop->inode.iso_uid = (uid_t)0; 282 inop->inode.iso_gid = (gid_t)0; 283 } 284 if (bp2) 285 brelse(bp2); 286 } 287 288 /* 289 * Time stamps 290 */ 291 void 292 cd9660_deftstamp(isodir,inop,bp) 293 struct iso_directory_record *isodir; 294 struct iso_node *inop; 295 struct buf *bp; 296 { 297 struct buf *bp2 = NULL; 298 struct iso_mnt *imp; 299 struct iso_extended_attributes *ap = NULL; 300 int off; 301 302 if (!bp 303 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 304 && (off = isonum_711(isodir->ext_attr_length))) { 305 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL, 306 &bp2); 307 bp = bp2; 308 } 309 if (bp) { 310 ap = (struct iso_extended_attributes *)bp->b_data; 311 312 if (isonum_711(ap->version) == 1) { 313 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 314 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 315 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 316 inop->inode.iso_ctime = inop->inode.iso_atime; 317 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 318 inop->inode.iso_mtime = inop->inode.iso_ctime; 319 } else 320 ap = NULL; 321 } 322 if (!ap) { 323 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 324 inop->inode.iso_atime = inop->inode.iso_ctime; 325 inop->inode.iso_mtime = inop->inode.iso_ctime; 326 } 327 if (bp2) 328 brelse(bp2); 329 } 330 331 int 332 cd9660_tstamp_conv7(pi,pu) 333 u_char *pi; 334 struct timespec *pu; 335 { 336 int crtime, days; 337 int y, m, d, hour, minute, second; 338 signed char tz; 339 340 y = pi[0] + 1900; 341 m = pi[1]; 342 d = pi[2]; 343 hour = pi[3]; 344 minute = pi[4]; 345 second = pi[5]; 346 tz = (signed char) pi[6]; 347 348 if (y < 1970) { 349 pu->tv_sec = 0; 350 pu->tv_nsec = 0; 351 return (0); 352 } else { 353 #ifdef ORIGINAL 354 /* computes day number relative to Sept. 19th,1989 */ 355 /* don't even *THINK* about changing formula. It works! */ 356 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 357 #else 358 /* 359 * Changed :-) to make it relative to Jan. 1st, 1970 360 * and to disambiguate negative division 361 */ 362 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 363 #endif 364 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 365 366 /* timezone offset is unreliable on some disks */ 367 if (-48 <= tz && tz <= 52) 368 crtime -= tz * 15 * 60; 369 } 370 pu->tv_sec = crtime; 371 pu->tv_nsec = 0; 372 return (1); 373 } 374 375 static u_int 376 cd9660_chars2ui(begin,len) 377 u_char *begin; 378 int len; 379 { 380 u_int rc; 381 382 for (rc = 0; --len >= 0;) { 383 rc *= 10; 384 rc += *begin++ - '0'; 385 } 386 return (rc); 387 } 388 389 int 390 cd9660_tstamp_conv17(pi,pu) 391 u_char *pi; 392 struct timespec *pu; 393 { 394 u_char buf[7]; 395 396 /* year:"0001"-"9999" -> -1900 */ 397 buf[0] = cd9660_chars2ui(pi,4) - 1900; 398 399 /* month: " 1"-"12" -> 1 - 12 */ 400 buf[1] = cd9660_chars2ui(pi + 4,2); 401 402 /* day: " 1"-"31" -> 1 - 31 */ 403 buf[2] = cd9660_chars2ui(pi + 6,2); 404 405 /* hour: " 0"-"23" -> 0 - 23 */ 406 buf[3] = cd9660_chars2ui(pi + 8,2); 407 408 /* minute:" 0"-"59" -> 0 - 59 */ 409 buf[4] = cd9660_chars2ui(pi + 10,2); 410 411 /* second:" 0"-"59" -> 0 - 59 */ 412 buf[5] = cd9660_chars2ui(pi + 12,2); 413 414 /* difference of GMT */ 415 buf[6] = pi[16]; 416 417 return (cd9660_tstamp_conv7(buf,pu)); 418 } 419 420 cdino_t 421 isodirino(isodir, imp) 422 struct iso_directory_record *isodir; 423 struct iso_mnt *imp; 424 { 425 cdino_t ino; 426 427 ino = (isonum_733(isodir->extent) + 428 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 429 return (ino); 430 } 431