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 1.21 2007/05/06 19:23:34 dillon 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 #define CD9660_HASH_SIZE_LIMIT 8192 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 #ifndef NULL_SIMPLELOCKS 65 static struct lwkt_token cd9660_ihash_token; 66 #endif 67 68 static void cd9660_ihashrem (struct iso_node *); 69 static unsigned cd9660_chars2ui (unsigned char *begin, int len); 70 71 /* 72 * Initialize hash links for inodes and dnodes. CDs and DVDs are small 73 * and slow compared to hard disks, there is no need to have a huge hash 74 * table so the size is capped at CD9660_HASH_SIZE_LIMIT. 75 */ 76 int 77 cd9660_init(struct vfsconf *vfsp) 78 { 79 int hlimit; 80 81 if ((hlimit = desiredvnodes) < CD9660_HASH_SIZE_LIMIT) 82 hlimit = CD9660_HASH_SIZE_LIMIT; 83 84 isohash = 16; 85 while (isohash < hlimit) 86 isohash <<= 1; 87 isohashtbl = kmalloc(sizeof(void *) * isohash, 88 M_ISOFSMNT, M_WAITOK|M_ZERO); 89 --isohash; 90 lwkt_token_init(&cd9660_ihash_token); 91 return (0); 92 } 93 94 int 95 cd9660_uninit(struct vfsconf *vfsp) 96 { 97 98 if (isohashtbl != NULL) 99 kfree(isohashtbl, M_ISOFSMNT); 100 return (0); 101 } 102 103 104 /* 105 * Use the device/inum pair to find the incore inode, and return a pointer 106 * to it. If it is in core, but locked, wait for it. 107 */ 108 struct vnode * 109 cd9660_ihashget(cdev_t dev, ino_t inum) 110 { 111 struct iso_node *ip; 112 lwkt_tokref ilock; 113 struct vnode *vp; 114 115 lwkt_gettoken(&ilock, &cd9660_ihash_token); 116 loop: 117 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 118 if (inum != ip->i_number || dev != ip->i_dev) 119 continue; 120 vp = ITOV(ip); 121 if (vget(vp, LK_EXCLUSIVE)) 122 goto loop; 123 /* 124 * We must check to see if the inode has been ripped 125 * out from under us after blocking. 126 */ 127 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 128 if (inum == ip->i_number && dev == ip->i_dev) 129 break; 130 } 131 if (ip == NULL || ITOV(ip) != vp) { 132 goto loop; 133 } 134 lwkt_reltoken(&ilock); 135 return (vp); 136 } 137 lwkt_reltoken(&ilock); 138 return (NULL); 139 } 140 141 /* 142 * Insert the inode into the hash table, return 0 on success, non-zero 143 * if the inode has already been found to be in the hash table. 144 */ 145 int 146 cd9660_ihashins(struct iso_node *ip) 147 { 148 struct iso_node **ipp, *iq; 149 lwkt_tokref ilock; 150 151 lwkt_gettoken(&ilock, &cd9660_ihash_token); 152 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 153 while ((iq = *ipp) != NULL) { 154 if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) { 155 lwkt_reltoken(&ilock); 156 return(EBUSY); 157 } 158 ipp = &iq->i_next; 159 } 160 ip->i_next = NULL; 161 *ipp = ip; 162 lwkt_reltoken(&ilock); 163 return(0); 164 } 165 166 /* 167 * Remove the inode from the hash table. 168 */ 169 static void 170 cd9660_ihashrem(struct iso_node *ip) 171 { 172 struct iso_node **ipp, *iq; 173 lwkt_tokref ilock; 174 175 lwkt_gettoken(&ilock, &cd9660_ihash_token); 176 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 177 while ((iq = *ipp) != NULL) { 178 if (ip == iq) 179 break; 180 ipp = &iq->i_next; 181 } 182 KKASSERT(ip == iq); 183 *ipp = ip->i_next; 184 ip->i_next = NULL; 185 lwkt_reltoken(&ilock); 186 } 187 188 /* 189 * Last reference to an inode, write the inode out and if necessary, 190 * truncate and deallocate the file. 191 * 192 * cd9660_inactive(struct vnode *a_vp) 193 */ 194 int 195 cd9660_inactive(struct vop_inactive_args *ap) 196 { 197 struct vnode *vp = ap->a_vp; 198 struct iso_node *ip = VTOI(vp); 199 int error = 0; 200 201 if (prtactive && vp->v_sysref.refcnt > 1) 202 vprint("cd9660_inactive: pushing active", vp); 203 204 if (ip) 205 ip->i_flag = 0; 206 /* 207 * If we are done with the inode, reclaim it 208 * so that it can be reused immediately. 209 */ 210 if (ip == NULL || ip->inode.iso_mode == 0) 211 vrecycle(vp); 212 return error; 213 } 214 215 /* 216 * Reclaim an inode so that it can be used for other purposes. 217 * 218 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p) 219 */ 220 int 221 cd9660_reclaim(struct vop_reclaim_args *ap) 222 { 223 struct vnode *vp = ap->a_vp; 224 struct iso_node *ip = VTOI(vp); 225 226 if (prtactive && vp->v_sysref.refcnt > 1) 227 vprint("cd9660_reclaim: pushing active", vp); 228 /* 229 * Remove the inode from its hash chain. 230 */ 231 vp->v_data = NULL; 232 if (ip) { 233 cd9660_ihashrem(ip); 234 if (ip->i_devvp) { 235 vrele(ip->i_devvp); 236 ip->i_devvp = 0; 237 } 238 kfree(ip, M_ISOFSNODE); 239 } 240 return (0); 241 } 242 243 /* 244 * File attributes 245 */ 246 void 247 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 248 struct buf *bp, enum ISO_FTYPE ftype) 249 { 250 struct buf *bp2 = NULL; 251 struct iso_mnt *imp; 252 struct iso_extended_attributes *ap = NULL; 253 int off; 254 255 /* high sierra does not have timezone data, flag is one byte ahead */ 256 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 257 &isodir->date[6]: isodir->flags)&2) { 258 inop->inode.iso_mode = S_IFDIR; 259 /* 260 * If we return 2, fts() will assume there are no subdirectories 261 * (just links for the path and .), so instead we return 1. 262 */ 263 inop->inode.iso_links = 1; 264 } else { 265 inop->inode.iso_mode = S_IFREG; 266 inop->inode.iso_links = 1; 267 } 268 if (!bp 269 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 270 && (off = isonum_711(isodir->ext_attr_length))) { 271 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 272 &bp2); 273 bp = bp2; 274 } 275 if (bp) { 276 ap = (struct iso_extended_attributes *)bp->b_data; 277 278 if (isonum_711(ap->version) == 1) { 279 if (!(ap->perm[0]&0x40)) 280 inop->inode.iso_mode |= VEXEC >> 6; 281 if (!(ap->perm[0]&0x10)) 282 inop->inode.iso_mode |= VREAD >> 6; 283 if (!(ap->perm[0]&4)) 284 inop->inode.iso_mode |= VEXEC >> 3; 285 if (!(ap->perm[0]&1)) 286 inop->inode.iso_mode |= VREAD >> 3; 287 if (!(ap->perm[1]&0x40)) 288 inop->inode.iso_mode |= VEXEC; 289 if (!(ap->perm[1]&0x10)) 290 inop->inode.iso_mode |= VREAD; 291 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 292 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 293 } else 294 ap = NULL; 295 } 296 if (!ap) { 297 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 298 inop->inode.iso_uid = (uid_t)0; 299 inop->inode.iso_gid = (gid_t)0; 300 } 301 if (bp2) 302 brelse(bp2); 303 } 304 305 /* 306 * Time stamps 307 */ 308 void 309 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 310 struct buf *bp, enum ISO_FTYPE ftype) 311 { 312 struct buf *bp2 = NULL; 313 struct iso_mnt *imp; 314 struct iso_extended_attributes *ap = NULL; 315 int off; 316 317 if (!bp 318 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 319 && (off = isonum_711(isodir->ext_attr_length))) { 320 cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 321 &bp2); 322 bp = bp2; 323 } 324 if (bp) { 325 ap = (struct iso_extended_attributes *)bp->b_data; 326 327 if (ftype != ISO_FTYPE_HIGH_SIERRA 328 && isonum_711(ap->version) == 1) { 329 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 330 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 331 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 332 inop->inode.iso_ctime = inop->inode.iso_atime; 333 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 334 inop->inode.iso_mtime = inop->inode.iso_ctime; 335 } else 336 ap = NULL; 337 } 338 if (!ap) { 339 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 340 inop->inode.iso_atime = inop->inode.iso_ctime; 341 inop->inode.iso_mtime = inop->inode.iso_ctime; 342 } 343 if (bp2) 344 brelse(bp2); 345 } 346 347 int 348 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) 349 { 350 int crtime, days; 351 int y, m, d, hour, minute, second, 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 if(ftype != ISO_FTYPE_HIGH_SIERRA) 360 tz = pi[6]; 361 else 362 /* original high sierra misses timezone data */ 363 tz = 0; 364 365 if (y < 1970) { 366 pu->tv_sec = 0; 367 pu->tv_nsec = 0; 368 return 0; 369 } else { 370 #ifdef ORIGINAL 371 /* computes day number relative to Sept. 19th,1989 */ 372 /* don't even *THINK* about changing formula. It works! */ 373 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 374 #else 375 /* 376 * Changed :-) to make it relative to Jan. 1st, 1970 377 * and to disambiguate negative division 378 */ 379 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 380 #endif 381 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 382 383 /* timezone offset is unreliable on some disks */ 384 if (-48 <= tz && tz <= 52) 385 crtime -= tz * 15 * 60; 386 } 387 pu->tv_sec = crtime; 388 pu->tv_nsec = 0; 389 return 1; 390 } 391 392 static u_int 393 cd9660_chars2ui(u_char *begin, int len) 394 { 395 u_int rc; 396 397 for (rc = 0; --len >= 0;) { 398 rc *= 10; 399 rc += *begin++ - '0'; 400 } 401 return rc; 402 } 403 404 int 405 cd9660_tstamp_conv17(u_char *pi, 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, ISO_FTYPE_DEFAULT); 431 } 432 433 ino_t 434 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 435 { 436 ino_t ino; 437 438 ino = (ino_t)(isonum_733(isodir->extent) + 439 isonum_711(isodir->ext_attr_length)) << imp->im_bshift; 440 return (ino); 441 } 442