| 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, 1); |
| 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 | struct vnode *vp; |
| 113 | |
| 114 | lwkt_gettoken(&cd9660_ihash_token); |
| 115 | loop: |
| 116 | for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { |
| 117 | if (inum != ip->i_number || dev != ip->i_dev) |
| 118 | continue; |
| 119 | vp = ITOV(ip); |
| 120 | if (vget(vp, LK_EXCLUSIVE)) |
| 121 | goto loop; |
| 122 | /* |
| 123 | * We must check to see if the inode has been ripped |
| 124 | * out from under us after blocking. |
| 125 | */ |
| 126 | for (ip = isohashtbl[INOHASH(dev, inum)]; ip; ip = ip->i_next) { |
| 127 | if (inum == ip->i_number && dev == ip->i_dev) |
| 128 | break; |
| 129 | } |
| 130 | if (ip == NULL || ITOV(ip) != vp) { |
| 131 | goto loop; |
| 132 | } |
| 133 | lwkt_reltoken(&cd9660_ihash_token); |
| 134 | return (vp); |
| 135 | } |
| 136 | lwkt_reltoken(&cd9660_ihash_token); |
| 137 | return (NULL); |
| 138 | } |
| 139 | |
| 140 | /* |
| 141 | * Insert the inode into the hash table, return 0 on success, non-zero |
| 142 | * if the inode has already been found to be in the hash table. |
| 143 | */ |
| 144 | int |
| 145 | cd9660_ihashins(struct iso_node *ip) |
| 146 | { |
| 147 | struct iso_node **ipp, *iq; |
| 148 | |
| 149 | lwkt_gettoken(&cd9660_ihash_token); |
| 150 | ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; |
| 151 | while ((iq = *ipp) != NULL) { |
| 152 | if (iq->i_dev == ip->i_dev && iq->i_number == ip->i_number) { |
| 153 | lwkt_reltoken(&cd9660_ihash_token); |
| 154 | return(EBUSY); |
| 155 | } |
| 156 | ipp = &iq->i_next; |
| 157 | } |
| 158 | ip->i_next = NULL; |
| 159 | *ipp = ip; |
| 160 | lwkt_reltoken(&cd9660_ihash_token); |
| 161 | return(0); |
| 162 | } |
| 163 | |
| 164 | /* |
| 165 | * Remove the inode from the hash table. |
| 166 | */ |
| 167 | static void |
| 168 | cd9660_ihashrem(struct iso_node *ip) |
| 169 | { |
| 170 | struct iso_node **ipp, *iq; |
| 171 | |
| 172 | lwkt_gettoken(&cd9660_ihash_token); |
| 173 | ipp = &isohashtbl[INOHASH(ip->i_dev, ip->i_number)]; |
| 174 | while ((iq = *ipp) != NULL) { |
| 175 | if (ip == iq) |
| 176 | break; |
| 177 | ipp = &iq->i_next; |
| 178 | } |
| 179 | KKASSERT(ip == iq); |
| 180 | *ipp = ip->i_next; |
| 181 | ip->i_next = NULL; |
| 182 | lwkt_reltoken(&cd9660_ihash_token); |
| 183 | } |
| 184 | |
| 185 | /* |
| 186 | * Last reference to an inode, write the inode out and if necessary, |
| 187 | * truncate and deallocate the file. |
| 188 | * |
| 189 | * cd9660_inactive(struct vnode *a_vp) |
| 190 | */ |
| 191 | int |
| 192 | cd9660_inactive(struct vop_inactive_args *ap) |
| 193 | { |
| 194 | struct vnode *vp = ap->a_vp; |
| 195 | struct iso_node *ip = VTOI(vp); |
| 196 | int error = 0; |
| 197 | |
| 198 | if (prtactive && vp->v_sysref.refcnt > 1) |
| 199 | vprint("cd9660_inactive: pushing active", vp); |
| 200 | |
| 201 | if (ip) |
| 202 | ip->i_flag = 0; |
| 203 | /* |
| 204 | * If we are done with the inode, reclaim it |
| 205 | * so that it can be reused immediately. |
| 206 | */ |
| 207 | if (ip == NULL || ip->inode.iso_mode == 0) |
| 208 | vrecycle(vp); |
| 209 | return error; |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Reclaim an inode so that it can be used for other purposes. |
| 214 | * |
| 215 | * cd9660_reclaim(struct vnode *a_vp, struct proc *a_p) |
| 216 | */ |
| 217 | int |
| 218 | cd9660_reclaim(struct vop_reclaim_args *ap) |
| 219 | { |
| 220 | struct vnode *vp = ap->a_vp; |
| 221 | struct iso_node *ip = VTOI(vp); |
| 222 | |
| 223 | if (prtactive && vp->v_sysref.refcnt > 1) |
| 224 | vprint("cd9660_reclaim: pushing active", vp); |
| 225 | /* |
| 226 | * Remove the inode from its hash chain. |
| 227 | */ |
| 228 | vp->v_data = NULL; |
| 229 | if (ip) { |
| 230 | cd9660_ihashrem(ip); |
| 231 | if (ip->i_devvp) { |
| 232 | vrele(ip->i_devvp); |
| 233 | ip->i_devvp = 0; |
| 234 | } |
| 235 | kfree(ip, M_ISOFSNODE); |
| 236 | } |
| 237 | return (0); |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * File attributes |
| 242 | */ |
| 243 | void |
| 244 | cd9660_defattr(struct iso_directory_record *isodir, struct iso_node *inop, |
| 245 | struct buf *bp, enum ISO_FTYPE ftype) |
| 246 | { |
| 247 | struct buf *bp2 = NULL; |
| 248 | struct iso_mnt *imp; |
| 249 | struct iso_extended_attributes *ap = NULL; |
| 250 | int off; |
| 251 | |
| 252 | /* high sierra does not have timezone data, flag is one byte ahead */ |
| 253 | if (isonum_711(ftype == ISO_FTYPE_HIGH_SIERRA? |
| 254 | &isodir->date[6]: isodir->flags)&2) { |
| 255 | inop->inode.iso_mode = S_IFDIR; |
| 256 | /* |
| 257 | * If we return 2, fts() will assume there are no subdirectories |
| 258 | * (just links for the path and .), so instead we return 1. |
| 259 | */ |
| 260 | inop->inode.iso_links = 1; |
| 261 | } else { |
| 262 | inop->inode.iso_mode = S_IFREG; |
| 263 | inop->inode.iso_links = 1; |
| 264 | } |
| 265 | if (!bp |
| 266 | && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) |
| 267 | && (off = isonum_711(isodir->ext_attr_length))) { |
| 268 | cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, |
| 269 | &bp2); |
| 270 | bp = bp2; |
| 271 | } |
| 272 | if (bp) { |
| 273 | ap = (struct iso_extended_attributes *)bp->b_data; |
| 274 | |
| 275 | if (isonum_711(ap->version) == 1) { |
| 276 | if (!(ap->perm[0]&0x40)) |
| 277 | inop->inode.iso_mode |= VEXEC >> 6; |
| 278 | if (!(ap->perm[0]&0x10)) |
| 279 | inop->inode.iso_mode |= VREAD >> 6; |
| 280 | if (!(ap->perm[0]&4)) |
| 281 | inop->inode.iso_mode |= VEXEC >> 3; |
| 282 | if (!(ap->perm[0]&1)) |
| 283 | inop->inode.iso_mode |= VREAD >> 3; |
| 284 | if (!(ap->perm[1]&0x40)) |
| 285 | inop->inode.iso_mode |= VEXEC; |
| 286 | if (!(ap->perm[1]&0x10)) |
| 287 | inop->inode.iso_mode |= VREAD; |
| 288 | inop->inode.iso_uid = isonum_723(ap->owner); /* what about 0? */ |
| 289 | inop->inode.iso_gid = isonum_723(ap->group); /* what about 0? */ |
| 290 | } else |
| 291 | ap = NULL; |
| 292 | } |
| 293 | if (!ap) { |
| 294 | inop->inode.iso_mode |= VREAD|VEXEC|(VREAD|VEXEC)>>3|(VREAD|VEXEC)>>6; |
| 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(struct iso_directory_record *isodir, struct iso_node *inop, |
| 307 | struct buf *bp, enum ISO_FTYPE ftype) |
| 308 | { |
| 309 | struct buf *bp2 = NULL; |
| 310 | struct iso_mnt *imp; |
| 311 | struct iso_extended_attributes *ap = NULL; |
| 312 | int off; |
| 313 | |
| 314 | if (!bp |
| 315 | && ((imp = inop->i_mnt)->im_flags & ISOFSMNT_EXTATT) |
| 316 | && (off = isonum_711(isodir->ext_attr_length))) { |
| 317 | cd9660_devblkatoff(ITOV(inop), (off_t)-(off << imp->im_bshift), NULL, |
| 318 | &bp2); |
| 319 | bp = bp2; |
| 320 | } |
| 321 | if (bp) { |
| 322 | ap = (struct iso_extended_attributes *)bp->b_data; |
| 323 | |
| 324 | if (ftype != ISO_FTYPE_HIGH_SIERRA |
| 325 | && 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,ftype); |
| 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(u_char *pi, struct timespec *pu, enum ISO_FTYPE ftype) |
| 346 | { |
| 347 | int crtime, days; |
| 348 | int y, m, d, hour, minute, second, tz; |
| 349 | |
| 350 | y = pi[0] + 1900; |
| 351 | m = pi[1]; |
| 352 | d = pi[2]; |
| 353 | hour = pi[3]; |
| 354 | minute = pi[4]; |
| 355 | second = pi[5]; |
| 356 | if(ftype != ISO_FTYPE_HIGH_SIERRA) |
| 357 | tz = pi[6]; |
| 358 | else |
| 359 | /* original high sierra misses timezone data */ |
| 360 | tz = 0; |
| 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(u_char *begin, int len) |
| 391 | { |
| 392 | u_int rc; |
| 393 | |
| 394 | for (rc = 0; --len >= 0;) { |
| 395 | rc *= 10; |
| 396 | rc += *begin++ - '0'; |
| 397 | } |
| 398 | return rc; |
| 399 | } |
| 400 | |
| 401 | int |
| 402 | cd9660_tstamp_conv17(u_char *pi, struct timespec *pu) |
| 403 | { |
| 404 | u_char buf[7]; |
| 405 | |
| 406 | /* year:"0001"-"9999" -> -1900 */ |
| 407 | buf[0] = cd9660_chars2ui(pi,4) - 1900; |
| 408 | |
| 409 | /* month: " 1"-"12" -> 1 - 12 */ |
| 410 | buf[1] = cd9660_chars2ui(pi + 4,2); |
| 411 | |
| 412 | /* day: " 1"-"31" -> 1 - 31 */ |
| 413 | buf[2] = cd9660_chars2ui(pi + 6,2); |
| 414 | |
| 415 | /* hour: " 0"-"23" -> 0 - 23 */ |
| 416 | buf[3] = cd9660_chars2ui(pi + 8,2); |
| 417 | |
| 418 | /* minute:" 0"-"59" -> 0 - 59 */ |
| 419 | buf[4] = cd9660_chars2ui(pi + 10,2); |
| 420 | |
| 421 | /* second:" 0"-"59" -> 0 - 59 */ |
| 422 | buf[5] = cd9660_chars2ui(pi + 12,2); |
| 423 | |
| 424 | /* difference of GMT */ |
| 425 | buf[6] = pi[16]; |
| 426 | |
| 427 | return cd9660_tstamp_conv7(buf, pu, ISO_FTYPE_DEFAULT); |
| 428 | } |
| 429 | |
| 430 | ino_t |
| 431 | isodirino(struct iso_directory_record *isodir, struct iso_mnt *imp) |
| 432 | { |
| 433 | ino_t ino; |
| 434 | |
| 435 | ino = (ino_t)(isonum_733(isodir->extent) + |
| 436 | isonum_711(isodir->ext_attr_length)) << imp->im_bshift; |
| 437 | return (ino); |
| 438 | } |