1 /* $OpenBSD: cd9660_node.c,v 1.34 2018/05/27 06:02:14 visa 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/buf.h> 44 #include <sys/vnode.h> 45 #include <sys/lock.h> 46 #include <sys/namei.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/stat.h> 50 51 #include <crypto/siphash.h> 52 53 #include <isofs/cd9660/iso.h> 54 #include <isofs/cd9660/cd9660_extern.h> 55 #include <isofs/cd9660/cd9660_node.h> 56 57 /* 58 * Structures associated with iso_node caching. 59 */ 60 u_int cd9660_isohash(dev_t, cdino_t); 61 62 struct iso_node **isohashtbl; 63 u_long isohash; 64 SIPHASH_KEY isohashkey; 65 #define INOHASH(device, inum) cd9660_isohash((device), (inum)) 66 67 extern int prtactive; /* 1 => print out reclaim of active vnodes */ 68 69 static u_int cd9660_chars2ui(u_char *, int); 70 71 /* 72 * Initialize hash links for inodes and dnodes. 73 */ 74 int 75 cd9660_init(vfsp) 76 struct vfsconf *vfsp; 77 { 78 79 isohashtbl = hashinit(initialvnodes, M_ISOFSMNT, M_WAITOK, &isohash); 80 arc4random_buf(&isohashkey, sizeof(isohashkey)); 81 return (0); 82 } 83 84 u_int 85 cd9660_isohash(dev_t device, cdino_t inum) 86 { 87 SIPHASH_CTX ctx; 88 89 SipHash24_Init(&ctx, &isohashkey); 90 SipHash24_Update(&ctx, &device, sizeof(device)); 91 SipHash24_Update(&ctx, &inum, sizeof(inum)); 92 return (SipHash24_End(&ctx) & isohash); 93 } 94 95 /* 96 * Use the device/inum pair to find the incore inode, and return a pointer 97 * to it. If it is in core, but locked, wait for it. 98 */ 99 struct vnode * 100 cd9660_ihashget(dev, inum) 101 dev_t dev; 102 cdino_t inum; 103 { 104 struct iso_node *ip; 105 struct vnode *vp; 106 107 loop: 108 /* XXX locking lock hash list? */ 109 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 110 if (inum == ip->i_number && dev == ip->i_dev) { 111 vp = ITOV(ip); 112 /* XXX locking unlock hash list? */ 113 if (vget(vp, LK_EXCLUSIVE)) 114 goto loop; 115 return (vp); 116 } 117 } 118 /* XXX locking unlock hash list? */ 119 return (NULL); 120 } 121 122 /* 123 * Insert the inode into the hash table, and return it locked. 124 */ 125 int 126 cd9660_ihashins(ip) 127 struct iso_node *ip; 128 { 129 struct iso_node **ipp, *iq; 130 131 /* XXX locking lock hash list? */ 132 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 133 134 for (iq = *ipp; iq; iq = iq->i_next) { 135 if (iq->i_dev == ip->i_dev && 136 iq->i_number == ip->i_number) 137 return (EEXIST); 138 } 139 140 if ((iq = *ipp) != NULL) 141 iq->i_prev = &ip->i_next; 142 ip->i_next = iq; 143 ip->i_prev = ipp; 144 *ipp = ip; 145 /* XXX locking unlock hash list? */ 146 147 rrw_enter(&ip->i_lock, RW_WRITE); 148 149 return (0); 150 } 151 152 /* 153 * Remove the inode from the hash table. 154 */ 155 void 156 cd9660_ihashrem(ip) 157 register struct iso_node *ip; 158 { 159 register struct iso_node *iq; 160 161 if (ip->i_prev == NULL) 162 return; 163 164 /* XXX locking lock hash list? */ 165 if ((iq = ip->i_next) != NULL) 166 iq->i_prev = ip->i_prev; 167 *ip->i_prev = iq; 168 #ifdef DIAGNOSTIC 169 ip->i_next = NULL; 170 ip->i_prev = NULL; 171 #endif 172 /* XXX locking unlock hash list? */ 173 } 174 175 /* 176 * Last reference to an inode, write the inode out and if necessary, 177 * truncate and deallocate the file. 178 */ 179 int 180 cd9660_inactive(v) 181 void *v; 182 { 183 struct vop_inactive_args *ap = v; 184 struct vnode *vp = ap->a_vp; 185 struct proc *p = ap->a_p; 186 register struct iso_node *ip = VTOI(vp); 187 int error = 0; 188 189 #ifdef DIAGNOSTIC 190 if (prtactive && vp->v_usecount != 0) 191 vprint("cd9660_inactive: pushing active", vp); 192 #endif 193 194 ip->i_flag = 0; 195 VOP_UNLOCK(vp); 196 /* 197 * If we are done with the inode, reclaim it 198 * so that it can be reused immediately. 199 */ 200 if (ip->inode.iso_mode == 0) 201 vrecycle(vp, p); 202 203 return (error); 204 } 205 206 /* 207 * Reclaim an inode so that it can be used for other purposes. 208 */ 209 int 210 cd9660_reclaim(v) 211 void *v; 212 { 213 struct vop_reclaim_args *ap = v; 214 register struct vnode *vp = ap->a_vp; 215 register struct iso_node *ip = VTOI(vp); 216 217 #ifdef DIAGNOSTIC 218 if (prtactive && vp->v_usecount != 0) 219 vprint("cd9660_reclaim: pushing active", vp); 220 #endif 221 222 /* 223 * Remove the inode from its hash chain. 224 */ 225 cd9660_ihashrem(ip); 226 /* 227 * Purge old data structures associated with the inode. 228 */ 229 cache_purge(vp); 230 if (ip->i_devvp) { 231 vrele(ip->i_devvp); 232 ip->i_devvp = 0; 233 } 234 free(vp->v_data, M_ISOFSNODE, 0); 235 vp->v_data = NULL; 236 return (0); 237 } 238 239 /* 240 * File attributes 241 */ 242 void 243 cd9660_defattr(isodir, inop, bp) 244 struct iso_directory_record *isodir; 245 struct iso_node *inop; 246 struct buf *bp; 247 { 248 struct buf *bp2 = NULL; 249 struct iso_mnt *imp; 250 struct iso_extended_attributes *ap = NULL; 251 int off; 252 253 if (isonum_711(isodir->flags)&2) { 254 inop->inode.iso_mode = S_IFDIR; 255 /* 256 * If we return 2, fts() will assume there are no subdirectories 257 * (just links for the path and .), so instead we return 1. 258 */ 259 inop->inode.iso_links = 1; 260 } else { 261 inop->inode.iso_mode = S_IFREG; 262 inop->inode.iso_links = 1; 263 } 264 if (!bp 265 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 266 && (off = isonum_711(isodir->ext_attr_length))) { 267 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL, 268 &bp2); 269 bp = bp2; 270 } 271 if (bp) { 272 ap = (struct iso_extended_attributes *)bp->b_data; 273 274 if (isonum_711(ap->version) == 1) { 275 if (!(ap->perm[1]&0x10)) 276 inop->inode.iso_mode |= S_IRUSR; 277 if (!(ap->perm[1]&0x40)) 278 inop->inode.iso_mode |= S_IXUSR; 279 if (!(ap->perm[0]&0x01)) 280 inop->inode.iso_mode |= S_IRGRP; 281 if (!(ap->perm[0]&0x04)) 282 inop->inode.iso_mode |= S_IXGRP; 283 if (!(ap->perm[0]&0x10)) 284 inop->inode.iso_mode |= S_IROTH; 285 if (!(ap->perm[0]&0x40)) 286 inop->inode.iso_mode |= S_IXOTH; 287 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 288 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 289 } else 290 ap = NULL; 291 } 292 if (!ap) { 293 inop->inode.iso_mode |= 294 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 295 inop->inode.iso_uid = (uid_t)0; 296 inop->inode.iso_gid = (gid_t)0; 297 } 298 if (bp2) 299 brelse(bp2); 300 } 301 302 /* 303 * Time stamps 304 */ 305 void 306 cd9660_deftstamp(isodir,inop,bp) 307 struct iso_directory_record *isodir; 308 struct iso_node *inop; 309 struct buf *bp; 310 { 311 struct buf *bp2 = NULL; 312 struct iso_mnt *imp; 313 struct iso_extended_attributes *ap = NULL; 314 int off; 315 316 if (!bp 317 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 318 && (off = isonum_711(isodir->ext_attr_length))) { 319 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL, 320 &bp2); 321 bp = bp2; 322 } 323 if (bp) { 324 ap = (struct iso_extended_attributes *)bp->b_data; 325 326 if (isonum_711(ap->version) == 1) { 327 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 328 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 329 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 330 inop->inode.iso_ctime = inop->inode.iso_atime; 331 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 332 inop->inode.iso_mtime = inop->inode.iso_ctime; 333 } else 334 ap = NULL; 335 } 336 if (!ap) { 337 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 338 inop->inode.iso_atime = inop->inode.iso_ctime; 339 inop->inode.iso_mtime = inop->inode.iso_ctime; 340 } 341 if (bp2) 342 brelse(bp2); 343 } 344 345 int 346 cd9660_tstamp_conv7(pi,pu) 347 u_char *pi; 348 struct timespec *pu; 349 { 350 int crtime, days; 351 int y, m, d, hour, minute, second; 352 signed char tz; 353 354 y = pi[0] + 1900; 355 m = pi[1]; 356 d = pi[2]; 357 hour = pi[3]; 358 minute = pi[4]; 359 second = pi[5]; 360 tz = (signed char) pi[6]; 361 362 if (y < 1970) { 363 pu->tv_sec = 0; 364 pu->tv_nsec = 0; 365 return (0); 366 } else { 367 #ifdef ORIGINAL 368 /* computes day number relative to Sept. 19th,1989 */ 369 /* don't even *THINK* about changing formula. It works! */ 370 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 371 #else 372 /* 373 * Changed :-) to make it relative to Jan. 1st, 1970 374 * and to disambiguate negative division 375 */ 376 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 377 #endif 378 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 379 380 /* timezone offset is unreliable on some disks */ 381 if (-48 <= tz && tz <= 52) 382 crtime -= tz * 15 * 60; 383 } 384 pu->tv_sec = crtime; 385 pu->tv_nsec = 0; 386 return (1); 387 } 388 389 static u_int 390 cd9660_chars2ui(begin,len) 391 u_char *begin; 392 int len; 393 { 394 u_int rc; 395 396 for (rc = 0; --len >= 0;) { 397 rc *= 10; 398 rc += *begin++ - '0'; 399 } 400 return (rc); 401 } 402 403 int 404 cd9660_tstamp_conv17(pi,pu) 405 u_char *pi; 406 struct timespec *pu; 407 { 408 u_char buf[7]; 409 410 /* year:"0001"-"9999" -> -1900 */ 411 buf[0] = cd9660_chars2ui(pi,4) - 1900; 412 413 /* month: " 1"-"12" -> 1 - 12 */ 414 buf[1] = cd9660_chars2ui(pi + 4,2); 415 416 /* day: " 1"-"31" -> 1 - 31 */ 417 buf[2] = cd9660_chars2ui(pi + 6,2); 418 419 /* hour: " 0"-"23" -> 0 - 23 */ 420 buf[3] = cd9660_chars2ui(pi + 8,2); 421 422 /* minute:" 0"-"59" -> 0 - 59 */ 423 buf[4] = cd9660_chars2ui(pi + 10,2); 424 425 /* second:" 0"-"59" -> 0 - 59 */ 426 buf[5] = cd9660_chars2ui(pi + 12,2); 427 428 /* difference of GMT */ 429 buf[6] = pi[16]; 430 431 return (cd9660_tstamp_conv7(buf,pu)); 432 } 433 434 cdino_t 435 isodirino(isodir, imp) 436 struct iso_directory_record *isodir; 437 struct iso_mnt *imp; 438 { 439 cdino_t ino; 440 441 ino = (isonum_733(isodir->extent) + 442 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 443 return (ino); 444 } 445