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 1.13 2004/10/12 19:20:58 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 /* 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 isohash = 16; 76 while (isohash < desiredvnodes) 77 isohash <<= 1; 78 isohashtbl = malloc(sizeof(void *) * isohash, 79 M_ISOFSMNT, M_WAITOK|M_ZERO); 80 --isohash; 81 lwkt_token_init(&cd9660_ihash_token); 82 return (0); 83 } 84 85 int 86 cd9660_uninit(struct vfsconf *vfsp) 87 { 88 89 if (isohashtbl != NULL) 90 free(isohashtbl, M_ISOFSMNT); 91 return (0); 92 } 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_t dev, ino_t inum) 101 { 102 struct thread *td = curthread; /* XXX */ 103 struct iso_node *ip; 104 lwkt_tokref ilock; 105 struct vnode *vp; 106 107 lwkt_gettoken(&ilock, &cd9660_ihash_token); 108 loop: 109 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 110 if (inum != ip->i_number || dev != ip->i_dev) 111 continue; 112 vp = ITOV(ip); 113 if (vget(vp, LK_EXCLUSIVE, td)) 114 goto loop; 115 /* 116 * We must check to see if the inode has been ripped 117 * out from under us after blocking. 118 */ 119 for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { 120 if (inum == ip->i_number && dev == ip->i_dev) 121 break; 122 } 123 if (ip == NULL || ITOV(ip) != vp) { 124 goto loop; 125 } 126 lwkt_reltoken(&ilock); 127 return (vp); 128 } 129 lwkt_reltoken(&ilock); 130 return (NULL); 131 } 132 133 /* 134 * Insert the inode into the hash table, return 0 on success, non-zero 135 * if the inode has already been found to be in the hash table. 136 */ 137 int 138 cd9660_ihashins(struct iso_node *ip) 139 { 140 struct iso_node **ipp, *iq; 141 lwkt_tokref ilock; 142 143 lwkt_gettoken(&ilock, &cd9660_ihash_token); 144 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 145 while ((iq = *ipp) != NULL) { 146 if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) { 147 lwkt_reltoken(&ilock); 148 return(EBUSY); 149 } 150 ipp = &iq->i_next; 151 } 152 ip->i_next = NULL; 153 *ipp = ip; 154 lwkt_reltoken(&ilock); 155 return(0); 156 } 157 158 /* 159 * Remove the inode from the hash table. 160 */ 161 static void 162 cd9660_ihashrem(struct iso_node *ip) 163 { 164 struct iso_node **ipp, *iq; 165 lwkt_tokref ilock; 166 167 lwkt_gettoken(&ilock, &cd9660_ihash_token); 168 ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; 169 while ((iq = *ipp) != NULL) { 170 if (ip == iq) 171 break; 172 ipp = &iq->i_next; 173 } 174 KKASSERT(ip == iq); 175 *ipp = ip->i_next; 176 ip->i_next = NULL; 177 lwkt_reltoken(&ilock); 178 } 179 180 /* 181 * Last reference to an inode, write the inode out and if necessary, 182 * truncate and deallocate the file. 183 * 184 * cd9660_inactive(struct vnode *a_vp, struct thread *a_td) 185 */ 186 int 187 cd9660_inactive(struct vop_inactive_args *ap) 188 { 189 struct vnode *vp = ap->a_vp; 190 struct thread *td = ap->a_td; 191 struct iso_node *ip = VTOI(vp); 192 int error = 0; 193 194 if (prtactive && vp->v_usecount != 0) 195 vprint("cd9660_inactive: pushing active", vp); 196 197 if (ip) 198 ip->i_flag = 0; 199 /* 200 * If we are done with the inode, reclaim it 201 * so that it can be reused immediately. 202 */ 203 if (ip == NULL || ip->inode.iso_mode == 0) 204 vrecycle(vp, td); 205 return error; 206 } 207 208 /* 209 * Reclaim an inode so that it can be used for other purposes. 210 * 211 * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p) 212 */ 213 int 214 cd9660_reclaim(struct vop_reclaim_args *ap) 215 { 216 struct vnode *vp = ap->a_vp; 217 struct iso_node *ip = VTOI(vp); 218 219 if (prtactive && vp->v_usecount != 0) 220 vprint("cd9660_reclaim: pushing active", vp); 221 /* 222 * Remove the inode from its hash chain. 223 */ 224 vp->v_data = NULL; 225 if (ip) { 226 cd9660_ihashrem(ip); 227 if (ip->i_devvp) { 228 vrele(ip->i_devvp); 229 ip->i_devvp = 0; 230 } 231 free(ip, M_ISOFSNODE); 232 } 233 return (0); 234 } 235 236 /* 237 * File attributes 238 */ 239 void 240 cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, 241 struct buf *bp, enum ISO_FTYPE ftype) 242 { 243 struct buf *bp2 = NULL; 244 struct iso_mnt *imp; 245 struct iso_extended_attributes *ap = NULL; 246 int off; 247 248 /* high sierra does not have timezone data, flag is one byte ahead */ 249 if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? 250 &isodir->date[6]: isodir->flags)&2) { 251 inop->inode.iso_mode = S_IFDIR; 252 /* 253 * If we return 2, fts() will assume there are no subdirectories 254 * (just links for the path and .), so instead we return 1. 255 */ 256 inop->inode.iso_links = 1; 257 } else { 258 inop->inode.iso_mode = S_IFREG; 259 inop->inode.iso_links = 1; 260 } 261 if (!bp 262 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 263 && (off = isonum_711(isodir->ext_attr_length))) { 264 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 265 &bp2); 266 bp = bp2; 267 } 268 if (bp) { 269 ap = (struct iso_extended_attributes *)bp->b_data; 270 271 if (isonum_711(ap->version) == 1) { 272 if (!(ap->perm[0]&0x40)) 273 inop->inode.iso_mode |= VEXEC >> 6; 274 if (!(ap->perm[0]&0x10)) 275 inop->inode.iso_mode |= VREAD >> 6; 276 if (!(ap->perm[0]&4)) 277 inop->inode.iso_mode |= VEXEC >> 3; 278 if (!(ap->perm[0]&1)) 279 inop->inode.iso_mode |= VREAD >> 3; 280 if (!(ap->perm[1]&0x40)) 281 inop->inode.iso_mode |= VEXEC; 282 if (!(ap->perm[1]&0x10)) 283 inop->inode.iso_mode |= VREAD; 284 inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ 285 inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ 286 } else 287 ap = NULL; 288 } 289 if (!ap) { 290 inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; 291 inop->inode.iso_uid = (uid_t)0; 292 inop->inode.iso_gid = (gid_t)0; 293 } 294 if (bp2) 295 brelse(bp2); 296 } 297 298 /* 299 * Time stamps 300 */ 301 void 302 cd9660_deftstamp(struct iso_directory_record *isodir, struct iso_node *inop, 303 struct buf *bp, enum ISO_FTYPE ftype) 304 { 305 struct buf *bp2 = NULL; 306 struct iso_mnt *imp; 307 struct iso_extended_attributes *ap = NULL; 308 int off; 309 310 if (!bp 311 && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) 312 && (off = isonum_711(isodir->ext_attr_length))) { 313 cd9660_blkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, 314 &bp2); 315 bp = bp2; 316 } 317 if (bp) { 318 ap = (struct iso_extended_attributes *)bp->b_data; 319 320 if (ftype != ISO_FTYPE_HIGH_SIERRA 321 && isonum_711(ap->version) == 1) { 322 if (!cd9660_tstamp_conv17(ap->ftime,&inop->inode.iso_atime)) 323 cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_atime); 324 if (!cd9660_tstamp_conv17(ap->ctime,&inop->inode.iso_ctime)) 325 inop->inode.iso_ctime = inop->inode.iso_atime; 326 if (!cd9660_tstamp_conv17(ap->mtime,&inop->inode.iso_mtime)) 327 inop->inode.iso_mtime = inop->inode.iso_ctime; 328 } else 329 ap = NULL; 330 } 331 if (!ap) { 332 cd9660_tstamp_conv7(isodir->date,&inop->inode.iso_ctime,ftype); 333 inop->inode.iso_atime = inop->inode.iso_ctime; 334 inop->inode.iso_mtime = inop->inode.iso_ctime; 335 } 336 if (bp2) 337 brelse(bp2); 338 } 339 340 int 341 cd9660_tstamp_conv7(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) 342 { 343 int crtime, days; 344 int y, m, d, hour, minute, second, tz; 345 346 y = pi[0] + 1900; 347 m = pi[1]; 348 d = pi[2]; 349 hour = pi[3]; 350 minute = pi[4]; 351 second = pi[5]; 352 if(ftype != ISO_FTYPE_HIGH_SIERRA) 353 tz = pi[6]; 354 else 355 /* original high sierra misses timezone data */ 356 tz = 0; 357 358 if (y < 1970) { 359 pu->tv_sec = 0; 360 pu->tv_nsec = 0; 361 return 0; 362 } else { 363 #ifdef ORIGINAL 364 /* computes day number relative to Sept. 19th,1989 */ 365 /* don't even *THINK* about changing formula. It works! */ 366 days = 367*(y-1980)-7*(y+(m+9)/12)/4-3*((y+(m-9)/7)/100+1)/4+275*m/9+d-100; 367 #else 368 /* 369 * Changed :-) to make it relative to Jan. 1st, 1970 370 * and to disambiguate negative division 371 */ 372 days = 367*(y-1960)-7*(y+(m+9)/12)/4-3*((y+(m+9)/12-1)/100+1)/4+275*m/9+d-239; 373 #endif 374 crtime = ((((days * 24) + hour) * 60 + minute) * 60) + second; 375 376 /* timezone offset is unreliable on some disks */ 377 if (-48 <= tz && tz <= 52) 378 crtime -= tz * 15 * 60; 379 } 380 pu->tv_sec = crtime; 381 pu->tv_nsec = 0; 382 return 1; 383 } 384 385 static u_int 386 cd9660_chars2ui(u_char *begin, int len) 387 { 388 u_int rc; 389 390 for (rc = 0; --len >= 0;) { 391 rc *= 10; 392 rc += *begin++ - '0'; 393 } 394 return rc; 395 } 396 397 int 398 cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) 399 { 400 u_char buf[7]; 401 402 /* year:"0001"-"9999" -> -1900 */ 403 buf[0] = cd9660_chars2ui(pi,4) - 1900; 404 405 /* month: " 1"-"12" -> 1 - 12 */ 406 buf[1] = cd9660_chars2ui(pi + 4,2); 407 408 /* day: " 1"-"31" -> 1 - 31 */ 409 buf[2] = cd9660_chars2ui(pi + 6,2); 410 411 /* hour: " 0"-"23" -> 0 - 23 */ 412 buf[3] = cd9660_chars2ui(pi + 8,2); 413 414 /* minute:" 0"-"59" -> 0 - 59 */ 415 buf[4] = cd9660_chars2ui(pi + 10,2); 416 417 /* second:" 0"-"59" -> 0 - 59 */ 418 buf[5] = cd9660_chars2ui(pi + 12,2); 419 420 /* difference of GMT */ 421 buf[6] = pi[16]; 422 423 return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); 424 } 425 426 ino_t 427 isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) 428 { 429 ino_t ino; 430 431 ino = (isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length)) 432 << imp->im_bshift; 433 return (ino); 434 } 435