1 /* $OpenBSD: cd9660_node.c,v 1.35 2020/02/27 09:10:31 mpi 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 register struct iso_node *ip = VTOI(vp); 186 int error = 0; 187 188 #ifdef DIAGNOSTIC 189 if (prtactive && vp->v_usecount != 0) 190 vprint("cd9660_inactive: pushing active", vp); 191 #endif 192 193 ip->i_flag = 0; 194 VOP_UNLOCK(vp); 195 /* 196 * If we are done with the inode, reclaim it 197 * so that it can be reused immediately. 198 */ 199 if (ip->inode.iso_mode == 0) 200 vrecycle(vp, ap->a_p); 201 202 return (error); 203 } 204 205 /* 206 * Reclaim an inode so that it can be used for other purposes. 207 */ 208 int 209 cd9660_reclaim(v) 210 void *v; 211 { 212 struct vop_reclaim_args *ap = v; 213 register struct vnode *vp = ap->a_vp; 214 register struct iso_node *ip = VTOI(vp); 215 216 #ifdef DIAGNOSTIC 217 if (prtactive && vp->v_usecount != 0) 218 vprint("cd9660_reclaim: pushing active", vp); 219 #endif 220 221 /* 222 * Remove the inode from its hash chain. 223 */ 224 cd9660_ihashrem(ip); 225 /* 226 * Purge old data structures associated with the inode. 227 */ 228 cache_purge(vp); 229 if (ip->i_devvp) { 230 vrele(ip->i_devvp); 231 ip->i_devvp = 0; 232 } 233 free(vp->v_data, M_ISOFSNODE, 0); 234 vp->v_data = NULL; 235 return (0); 236 } 237 238 /* 239 * File attributes 240 */ 241 void 242 cd9660_defattr(isodir, inop, bp) 243 struct iso_directory_record *isodir; 244 struct iso_node *inop; 245 struct buf *bp; 246 { 247 struct buf *bp2 = NULL; 248 struct iso_mnt *imp; 249 struct iso_extended_attributes *ap = NULL; 250 int off; 251 252 if (isonum_711(isodir->flags)&2) { 253 inop->inode.iso_mode = S_IFDIR; 254 /* 255 * If we return 2, fts() will assume there are no subdirectories 256 * (just links for the path and .), so instead we return 1. 257 */ 258 inop->inode.iso_links = 1; 259 } else { 260 inop->inode.iso_mode = S_IFREG; 261 inop->inode.iso_links = 1; 262 } 263 if (!bp 264 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 265 && (off = isonum_711(isodir->ext_attr_length))) { 266 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL, 267 &bp2); 268 bp = bp2; 269 } 270 if (bp) { 271 ap = (struct iso_extended_attributes *)bp->b_data; 272 273 if (isonum_711(ap->version) == 1) { 274 if (!(ap->perm[1]&0x10)) 275 inop->inode.iso_mode |= S_IRUSR; 276 if (!(ap->perm[1]&0x40)) 277 inop->inode.iso_mode |= S_IXUSR; 278 if (!(ap->perm[0]&0x01)) 279 inop->inode.iso_mode |= S_IRGRP; 280 if (!(ap->perm[0]&0x04)) 281 inop->inode.iso_mode |= S_IXGRP; 282 if (!(ap->perm[0]&0x10)) 283 inop->inode.iso_mode |= S_IROTH; 284 if (!(ap->perm[0]&0x40)) 285 inop->inode.iso_mode |= S_IXOTH; 286 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 287 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 288 } else 289 ap = NULL; 290 } 291 if (!ap) { 292 inop->inode.iso_mode |= 293 S_IRUSR|S_IXUSR|S_IRGRP|S_IXGRP|S_IROTH|S_IXOTH; 294 inop->inode.iso_uid = (uid_t)0; 295 inop->inode.iso_gid = (gid_t)0; 296 } 297 if (bp2) 298 brelse(bp2); 299 } 300 301 /* 302 * Time stamps 303 */ 304 void 305 cd9660_deftstamp(isodir,inop,bp) 306 struct iso_directory_record *isodir; 307 struct iso_node *inop; 308 struct buf *bp; 309 { 310 struct buf *bp2 = NULL; 311 struct iso_mnt *imp; 312 struct iso_extended_attributes *ap = NULL; 313 int off; 314 315 if (!bp 316 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 317 && (off = isonum_711(isodir->ext_attr_length))) { 318 cd9660_bufatoff(inop, (off_t)-(off << imp->im_bshift), NULL, 319 &bp2); 320 bp = bp2; 321 } 322 if (bp) { 323 ap = (struct iso_extended_attributes *)bp->b_data; 324 325 if (isonum_711(ap->version) == 1) { 326 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 327 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 328 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 329 inop->inode.iso_ctime = inop->inode.iso_atime; 330 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 331 inop->inode.iso_mtime = inop->inode.iso_ctime; 332 } else 333 ap = NULL; 334 } 335 if (!ap) { 336 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime); 337 inop->inode.iso_atime = inop->inode.iso_ctime; 338 inop->inode.iso_mtime = inop->inode.iso_ctime; 339 } 340 if (bp2) 341 brelse(bp2); 342 } 343 344 int 345 cd9660_tstamp_conv7(pi,pu) 346 u_char *pi; 347 struct timespec *pu; 348 { 349 int crtime, days; 350 int y, m, d, hour, minute, second; 351 signed char tz; 352 353 y = pi[0] + 1900; 354 m = pi[1]; 355 d = pi[2]; 356 hour = pi[3]; 357 minute = pi[4]; 358 second = pi[5]; 359 tz = (signed char) pi[6]; 360 361 if (y < 1970) { 362 pu->tv_sec = 0; 363 pu->tv_nsec = 0; 364 return (0); 365 } else { 366 #ifdef ORIGINAL 367 /* computes day number relative to Sept. 19th,1989 */ 368 /* don't even *THINK* about changing formula. It works! */ 369 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 370 #else 371 /* 372 * Changed :-) to make it relative to Jan. 1st, 1970 373 * and to disambiguate negative division 374 */ 375 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 376 #endif 377 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 378 379 /* timezone offset is unreliable on some disks */ 380 if (-48 <= tz && tz <= 52) 381 crtime -= tz * 15 * 60; 382 } 383 pu->tv_sec = crtime; 384 pu->tv_nsec = 0; 385 return (1); 386 } 387 388 static u_int 389 cd9660_chars2ui(begin,len) 390 u_char *begin; 391 int len; 392 { 393 u_int rc; 394 395 for (rc = 0; --len >= 0;) { 396 rc *= 10; 397 rc += *begin++ - '0'; 398 } 399 return (rc); 400 } 401 402 int 403 cd9660_tstamp_conv17(pi,pu) 404 u_char *pi; 405 struct timespec *pu; 406 { 407 u_char buf[7]; 408 409 /* year:"0001"-"9999" -> -1900 */ 410 buf[0] = cd9660_chars2ui(pi,4) - 1900; 411 412 /* month: " 1"-"12" -> 1 - 12 */ 413 buf[1] = cd9660_chars2ui(pi + 4,2); 414 415 /* day: " 1"-"31" -> 1 - 31 */ 416 buf[2] = cd9660_chars2ui(pi + 6,2); 417 418 /* hour: " 0"-"23" -> 0 - 23 */ 419 buf[3] = cd9660_chars2ui(pi + 8,2); 420 421 /* minute:" 0"-"59" -> 0 - 59 */ 422 buf[4] = cd9660_chars2ui(pi + 10,2); 423 424 /* second:" 0"-"59" -> 0 - 59 */ 425 buf[5] = cd9660_chars2ui(pi + 12,2); 426 427 /* difference of GMT */ 428 buf[6] = pi[16]; 429 430 return (cd9660_tstamp_conv7(buf,pu)); 431 } 432 433 cdino_t 434 isodirino(isodir, imp) 435 struct iso_directory_record *isodir; 436 struct iso_mnt *imp; 437 { 438 cdino_t ino; 439 440 ino = (isonum_733(isodir->extent) + 441 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 442 return (ino); 443 } 444