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 * $FreeBSD: src/sys/isofs/cd9660/cd9660_node.c,v 1.29.2.1 2000/07/08 14:35:56 bp Exp $ 40 * $DragonFly: src/sys/vfs/isofs/cd9660/cd9660_node.c,v 1.10 2004/04/12 23:18:55 cpressey Exp $ 41 */ 42 43 #include <sys/param.h> 44 #include <sys/systm.h> 45 #include <sys/mount.h> 46 #include <sys/proc.h> 47 #include <sys/buf.h> 48 #include <sys/vnode.h> 49 #include <sys/malloc.h> 50 #include <sys/stat.h> 51 52 #include "iso.h" 53 #include "cd9660_node.h" 54 #include "cd9660_mount.h" 55 56 /* 57 * Structures associated with iso_node caching. 58 */ 59 static struct iso_node **isohashtbl; 60 static u_long isohash; 61 #define INOHASH(device, inum) ((minor(device) + ((inum)>>12)) & isohash) 62 #ifndef NULL_SIMPLELOCKS 63 static struct lwkt_token cd9660_ihash_token; 64 #endif 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(struct vfsconf *vfsp) 74 { 75 76 isohashtbl = hashinit(desiredvnodes, M_ISOFSMNT, &isohash); 77 lwkt_token_init(&cd9660_ihash_token); 78 return (0); 79 } 80 81 int 82 cd9660_uninit(struct vfsconf *vfsp) 83 { 84 85 if (isohashtbl != NULL) 86 free(isohashtbl, M_ISOFSMNT); 87 return (0); 88 } 89 90 91 /* 92 * Use the device/inum pair to find the incore inode, and return a pointer 93 * to it. If it is in core, but locked, wait for it. 94 */ 95 struct vnode * 96 cd9660_ihashget(dev_t dev, ino_t inum) 97 { 98 struct thread *td = curthread; /* XXX */ 99 struct iso_node *ip; 100 lwkt_tokref ilock; 101 lwkt_tokref vlock; 102 struct vnode *vp; 103 104 lwkt_gettoken(&ilock, &cd9660_ihash_token); 105 loop: 106 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 107 if (inum != ip->i_number || dev != ip->i_dev) 108 continue; 109 vp = ITOV(ip); 110 lwkt_gettoken(&vlock, vp->v_interlock); 111 /* 112 * We must check to see if the inode has been ripped 113 * out from under us after blocking. 114 */ 115 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 116 if (inum == ip->i_number && dev == ip->i_dev) 117 break; 118 } 119 if (ip == NULL || ITOV(ip) != vp) { 120 lwkt_reltoken(&vlock); 121 goto loop; 122 } 123 if (vget(vp, &vlock, LK_EXCLUSIVE | LK_INTERLOCK, td)) 124 goto loop; 125 lwkt_reltoken(&ilock); 126 return (vp); 127 } 128 lwkt_reltoken(&ilock); 129 return (NULL); 130 } 131 132 /* 133 * Insert the inode into the hash table, and return it locked. 134 */ 135 void 136 cd9660_ihashins(struct iso_node *ip) 137 { 138 struct thread *td = curthread; /* XXX */ 139 struct iso_node **ipp, *iq; 140 lwkt_tokref ilock; 141 142 lwkt_gettoken(&ilock, &cd9660_ihash_token); 143 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 144 if ((iq = *ipp) != NULL) 145 iq->i_prev = &ip->i_next; 146 ip->i_next = iq; 147 ip->i_prev = ipp; 148 *ipp = ip; 149 lwkt_reltoken(&ilock); 150 151 lockmgr(&ip->i_lock, LK_EXCLUSIVE, NULL, td); 152 } 153 154 /* 155 * Remove the inode from the hash table. 156 */ 157 static void 158 cd9660_ihashrem(struct iso_node *ip) 159 { 160 struct iso_node *iq; 161 lwkt_tokref ilock; 162 163 lwkt_gettoken(&ilock, &cd9660_ihash_token); 164 if ((iq = ip->i_next) != NULL) 165 iq->i_prev = ip->i_prev; 166 *ip->i_prev = iq; 167 #ifdef DIAGNOSTIC 168 ip->i_next = NULL; 169 ip->i_prev = NULL; 170 #endif 171 lwkt_reltoken(&ilock); 172 } 173 174 /* 175 * Last reference to an inode, write the inode out and if necessary, 176 * truncate and deallocate the file. 177 * 178 * cd9660_inactive(struct vnode *a_vp, struct thread *a_td) 179 */ 180 int 181 cd9660_inactive(struct vop_inactive_args *ap) 182 { 183 struct vnode *vp = ap->a_vp; 184 struct thread *td = ap->a_td; 185 struct iso_node *ip = VTOI(vp); 186 int error = 0; 187 188 if (prtactive && vp->v_usecount != 0) 189 vprint("cd9660_inactive: pushing active", vp); 190 191 ip->i_flag = 0; 192 VOP_UNLOCK(vp, NULL, 0, td); 193 /* 194 * If we are done with the inode, reclaim it 195 * so that it can be reused immediately. 196 */ 197 if (ip->inode.iso_mode == 0) 198 vrecycle(vp, NULL, td); 199 return error; 200 } 201 202 /* 203 * Reclaim an inode so that it can be used for other purposes. 204 * 205 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p) 206 */ 207 int 208 cd9660_reclaim(struct vop_reclaim_args *ap) 209 { 210 struct vnode *vp = ap->a_vp; 211 struct iso_node *ip = VTOI(vp); 212 213 if (prtactive && vp->v_usecount != 0) 214 vprint("cd9660_reclaim: pushing active", vp); 215 /* 216 * Remove the inode from its hash chain. 217 */ 218 cd9660_ihashrem(ip); 219 /* 220 * Purge old data structures associated with the inode. 221 */ 222 cache_purge(vp); 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(struct iso_directory_record *isodir, struct iso_node *inop, 237 struct buf *bp, enum ISO_FTYPE ftype) 238 { 239 struct buf *bp2 = NULL; 240 struct iso_mnt *imp; 241 struct iso_extended_attributes *ap = NULL; 242 int off; 243 244 /* high sierra does not have timezone data, flag is one byte ahead */ 245 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 246 &isodir->date[6]: isodir->flags)&2) { 247 inop->inode.iso_mode = S_IFDIR; 248 /* 249 * If we return 2, fts() will assume there are no subdirectories 250 * (just links for the path and .), so instead we return 1. 251 */ 252 inop->inode.iso_links = 1; 253 } else { 254 inop->inode.iso_mode = S_IFREG; 255 inop->inode.iso_links = 1; 256 } 257 if (!bp 258 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 259 && (off = isonum_711(isodir->ext_attr_length))) { 260 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 261 &bp2); 262 bp = bp2; 263 } 264 if (bp) { 265 ap = (struct iso_extended_attributes *)bp->b_data; 266 267 if (isonum_711(ap->version) == 1) { 268 if (!(ap->perm[0]&0x40)) 269 inop->inode.iso_mode |= VEXEC >> 6; 270 if (!(ap->perm[0]&0x10)) 271 inop->inode.iso_mode |= VREAD >> 6; 272 if (!(ap->perm[0]&4)) 273 inop->inode.iso_mode |= VEXEC >> 3; 274 if (!(ap->perm[0]&1)) 275 inop->inode.iso_mode |= VREAD >> 3; 276 if (!(ap->perm[1]&0x40)) 277 inop->inode.iso_mode |= VEXEC; 278 if (!(ap->perm[1]&0x10)) 279 inop->inode.iso_mode |= VREAD; 280 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 281 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 282 } else 283 ap = NULL; 284 } 285 if (!ap) { 286 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 287 inop->inode.iso_uid = (uid_t)0; 288 inop->inode.iso_gid = (gid_t)0; 289 } 290 if (bp2) 291 brelse(bp2); 292 } 293 294 /* 295 * Time stamps 296 */ 297 void 298 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 299 struct buf *bp, enum ISO_FTYPE ftype) 300 { 301 struct buf *bp2 = NULL; 302 struct iso_mnt *imp; 303 struct iso_extended_attributes *ap = NULL; 304 int off; 305 306 if (!bp 307 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 308 && (off = isonum_711(isodir->ext_attr_length))) { 309 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 310 &bp2); 311 bp = bp2; 312 } 313 if (bp) { 314 ap = (struct iso_extended_attributes *)bp->b_data; 315 316 if (ftype != ISO_FTYPE_HIGH_SIERRA 317 && isonum_711(ap->version) == 1) { 318 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 319 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 320 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 321 inop->inode.iso_ctime = inop->inode.iso_atime; 322 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 323 inop->inode.iso_mtime = inop->inode.iso_ctime; 324 } else 325 ap = NULL; 326 } 327 if (!ap) { 328 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 329 inop->inode.iso_atime = inop->inode.iso_ctime; 330 inop->inode.iso_mtime = inop->inode.iso_ctime; 331 } 332 if (bp2) 333 brelse(bp2); 334 } 335 336 int 337 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) 338 { 339 int crtime, days; 340 int y, m, d, hour, minute, second, tz; 341 342 y = pi[0] + 1900; 343 m = pi[1]; 344 d = pi[2]; 345 hour = pi[3]; 346 minute = pi[4]; 347 second = pi[5]; 348 if(ftype != ISO_FTYPE_HIGH_SIERRA) 349 tz = pi[6]; 350 else 351 /* original high sierra misses timezone data */ 352 tz = 0; 353 354 if (y < 1970) { 355 pu->tv_sec = 0; 356 pu->tv_nsec = 0; 357 return 0; 358 } else { 359 #ifdef ORIGINAL 360 /* computes day number relative to Sept. 19th,1989 */ 361 /* don't even *THINK* about changing formula. It works! */ 362 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 363 #else 364 /* 365 * Changed :-) to make it relative to Jan. 1st, 1970 366 * and to disambiguate negative division 367 */ 368 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 369 #endif 370 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 371 372 /* timezone offset is unreliable on some disks */ 373 if (-48 <= tz && tz <= 52) 374 crtime -= tz * 15 * 60; 375 } 376 pu->tv_sec = crtime; 377 pu->tv_nsec = 0; 378 return 1; 379 } 380 381 static u_int 382 cd9660_chars2ui(u_char *begin, int len) 383 { 384 u_int rc; 385 386 for (rc = 0; --len >= 0;) { 387 rc *= 10; 388 rc += *begin++ - '0'; 389 } 390 return rc; 391 } 392 393 int 394 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) 395 { 396 u_char buf[7]; 397 398 /* year:"0001"-"9999" -> -1900 */ 399 buf[0] = cd9660_chars2ui(pi,4) - 1900; 400 401 /* month: " 1"-"12" -> 1 - 12 */ 402 buf[1] = cd9660_chars2ui(pi + 4,2); 403 404 /* day: " 1"-"31" -> 1 - 31 */ 405 buf[2] = cd9660_chars2ui(pi + 6,2); 406 407 /* hour: " 0"-"23" -> 0 - 23 */ 408 buf[3] = cd9660_chars2ui(pi + 8,2); 409 410 /* minute:" 0"-"59" -> 0 - 59 */ 411 buf[4] = cd9660_chars2ui(pi + 10,2); 412 413 /* second:" 0"-"59" -> 0 - 59 */ 414 buf[5] = cd9660_chars2ui(pi + 12,2); 415 416 /* difference of GMT */ 417 buf[6] = pi[16]; 418 419 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 420 } 421 422 ino_t 423 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 424 { 425 ino_t ino; 426 427 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 428 << imp->im_bshift; 429 return (ino); 430 } 431