1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley 8 * by Pace Willisson (pace@blitz.com). The Rock Ridge Extension 9 * Support code is derived from software contributed to Berkeley 10 * by Atsushi Murai (amurai@spec.co.jp). 11 * 12 * Redistribution and use in source and binary forms, with or without 13 * modification, are permitted provided that the following conditions 14 * are met: 15 * 1. Redistributions of source code must retain the above copyright 16 * notice, this list of conditions and the following disclaimer. 17 * 2. Redistributions in binary form must reproduce the above copyright 18 * notice, this list of conditions and the following disclaimer in the 19 * documentation and/or other materials provided with the distribution. 20 * 3. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95 37 */ 38 39 #include <sys/cdefs.h> 40 #include <sys/param.h> 41 #include <sys/systm.h> 42 #include <sys/namei.h> 43 #include <sys/priv.h> 44 #include <sys/proc.h> 45 #include <sys/kernel.h> 46 #include <sys/vnode.h> 47 #include <sys/mount.h> 48 #include <sys/bio.h> 49 #include <sys/buf.h> 50 #include <sys/cdio.h> 51 #include <sys/conf.h> 52 #include <sys/fcntl.h> 53 #include <sys/malloc.h> 54 #include <sys/stat.h> 55 #include <sys/syslog.h> 56 #include <sys/iconv.h> 57 58 #include <fs/cd9660/iso.h> 59 #include <fs/cd9660/iso_rrip.h> 60 #include <fs/cd9660/cd9660_node.h> 61 #include <fs/cd9660/cd9660_mount.h> 62 63 #include <geom/geom.h> 64 #include <geom/geom_vfs.h> 65 66 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure"); 67 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part"); 68 69 struct iconv_functions *cd9660_iconv = NULL; 70 71 static vfs_mount_t cd9660_mount; 72 static vfs_cmount_t cd9660_cmount; 73 static vfs_unmount_t cd9660_unmount; 74 static vfs_root_t cd9660_root; 75 static vfs_statfs_t cd9660_statfs; 76 static vfs_vget_t cd9660_vget; 77 static vfs_fhtovp_t cd9660_fhtovp; 78 79 static struct vfsops cd9660_vfsops = { 80 .vfs_fhtovp = cd9660_fhtovp, 81 .vfs_mount = cd9660_mount, 82 .vfs_cmount = cd9660_cmount, 83 .vfs_root = cd9660_root, 84 .vfs_statfs = cd9660_statfs, 85 .vfs_unmount = cd9660_unmount, 86 .vfs_vget = cd9660_vget, 87 }; 88 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY); 89 MODULE_VERSION(cd9660, 1); 90 91 static int cd9660_vfs_hash_cmp(struct vnode *vp, void *pino); 92 static int iso_mountfs(struct vnode *devvp, struct mount *mp); 93 94 /* 95 * VFS Operations. 96 */ 97 98 static int 99 cd9660_cmount(struct mntarg *ma, void *data, uint64_t flags) 100 { 101 struct iso_args args; 102 int error; 103 104 error = copyin(data, &args, sizeof args); 105 if (error) 106 return (error); 107 108 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 109 ma = mount_arg(ma, "export", &args.export, sizeof(args.export)); 110 ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64); 111 ma = mount_argsu(ma, "cs_local", args.cs_local, 64); 112 ma = mount_argf(ma, "ssector", "%u", args.ssector); 113 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip"); 114 ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens"); 115 ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt"); 116 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet"); 117 ma = mount_argb(ma, 118 args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet"); 119 ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv"); 120 121 error = kernel_mount(ma, flags); 122 123 return (error); 124 } 125 126 static int 127 cd9660_mount(struct mount *mp) 128 { 129 struct vnode *devvp; 130 struct thread *td; 131 char *fspec; 132 int error; 133 accmode_t accmode; 134 struct nameidata ndp; 135 struct iso_mnt *imp = NULL; 136 137 td = curthread; 138 139 /* 140 * Unconditionally mount as read-only. 141 */ 142 MNT_ILOCK(mp); 143 mp->mnt_flag |= MNT_RDONLY; 144 MNT_IUNLOCK(mp); 145 146 fspec = vfs_getopts(mp->mnt_optnew, "from", &error); 147 if (error) 148 return (error); 149 150 imp = VFSTOISOFS(mp); 151 152 if (mp->mnt_flag & MNT_UPDATE) { 153 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) 154 return (0); 155 } 156 /* 157 * Not an update, or updating the name: look up the name 158 * and verify that it refers to a sensible block device. 159 */ 160 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec); 161 if ((error = namei(&ndp))) 162 return (error); 163 NDFREE_PNBUF(&ndp); 164 devvp = ndp.ni_vp; 165 166 if (!vn_isdisk_error(devvp, &error)) { 167 vput(devvp); 168 return (error); 169 } 170 171 /* 172 * Verify that user has necessary permissions on the device, 173 * or has superuser abilities 174 */ 175 accmode = VREAD; 176 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 177 if (error) 178 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 179 if (error) { 180 vput(devvp); 181 return (error); 182 } 183 184 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 185 error = iso_mountfs(devvp, mp); 186 if (error) 187 vrele(devvp); 188 } else { 189 if (devvp != imp->im_devvp) 190 error = EINVAL; /* needs translation */ 191 vput(devvp); 192 } 193 if (error) 194 return (error); 195 vfs_mountedfrom(mp, fspec); 196 return (0); 197 } 198 199 /* 200 * Common code for mount and mountroot 201 */ 202 static int 203 iso_mountfs(struct vnode *devvp, struct mount *mp) 204 { 205 struct iso_mnt *isomp = NULL; 206 struct buf *bp = NULL; 207 struct buf *pribp = NULL, *supbp = NULL; 208 struct cdev *dev; 209 int error = EINVAL; 210 int high_sierra = 0; 211 int iso_bsize; 212 int iso_blknum; 213 int joliet_level; 214 int isverified = 0; 215 struct iso_volume_descriptor *vdp = NULL; 216 struct iso_primary_descriptor *pri = NULL; 217 struct iso_sierra_primary_descriptor *pri_sierra = NULL; 218 struct iso_supplementary_descriptor *sup = NULL; 219 struct iso_directory_record *rootp; 220 int logical_block_size, ssector; 221 struct g_consumer *cp; 222 struct bufobj *bo; 223 char *cs_local, *cs_disk; 224 225 dev = devvp->v_rdev; 226 dev_ref(dev); 227 g_topology_lock(); 228 error = g_vfs_open(devvp, &cp, "cd9660", 0); 229 if (error == 0) 230 g_getattr("MNT::verified", cp, &isverified); 231 g_topology_unlock(); 232 VOP_UNLOCK(devvp); 233 if (error) 234 goto out; 235 if (devvp->v_rdev->si_iosize_max != 0) 236 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 237 if (mp->mnt_iosize_max > maxphys) 238 mp->mnt_iosize_max = maxphys; 239 240 bo = &devvp->v_bufobj; 241 242 /* This is the "logical sector size". The standard says this 243 * should be 2048 or the physical sector size on the device, 244 * whichever is greater. 245 */ 246 if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) { 247 error = EINVAL; 248 goto out; 249 } 250 251 iso_bsize = cp->provider->sectorsize; 252 253 joliet_level = 0; 254 if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector)) 255 ssector = 0; 256 for (iso_blknum = 16 + ssector; 257 iso_blknum < 100 + ssector; 258 iso_blknum++) { 259 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE), 260 iso_bsize, NOCRED, &bp)) != 0) 261 goto out; 262 263 vdp = (struct iso_volume_descriptor *)bp->b_data; 264 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) { 265 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID, 266 sizeof vdp->id_sierra) != 0) { 267 error = EINVAL; 268 goto out; 269 } else 270 high_sierra = 1; 271 } 272 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){ 273 case ISO_VD_PRIMARY: 274 if (pribp == NULL) { 275 pribp = bp; 276 bp = NULL; 277 pri = (struct iso_primary_descriptor *)vdp; 278 pri_sierra = 279 (struct iso_sierra_primary_descriptor *)vdp; 280 } 281 break; 282 283 case ISO_VD_SUPPLEMENTARY: 284 if (supbp == NULL) { 285 supbp = bp; 286 bp = NULL; 287 sup = (struct iso_supplementary_descriptor *)vdp; 288 289 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) { 290 if (bcmp(sup->escape, "%/@", 3) == 0) 291 joliet_level = 1; 292 if (bcmp(sup->escape, "%/C", 3) == 0) 293 joliet_level = 2; 294 if (bcmp(sup->escape, "%/E", 3) == 0) 295 joliet_level = 3; 296 297 if ((isonum_711 (sup->flags) & 1) && 298 !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0)) 299 joliet_level = 0; 300 } 301 } 302 break; 303 304 case ISO_VD_END: 305 goto vd_end; 306 307 default: 308 break; 309 } 310 if (bp != NULL) { 311 brelse(bp); 312 bp = NULL; 313 } 314 } 315 vd_end: 316 if (bp != NULL) { 317 brelse(bp); 318 bp = NULL; 319 } 320 321 if (pri == NULL) { 322 error = EINVAL; 323 goto out; 324 } 325 326 logical_block_size = 327 isonum_723 (high_sierra? 328 pri_sierra->logical_block_size: 329 pri->logical_block_size); 330 331 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 332 || (logical_block_size & (logical_block_size - 1)) != 0) { 333 error = EINVAL; 334 goto out; 335 } 336 337 if (logical_block_size < cp->provider->sectorsize) { 338 printf("cd9660: Unsupported logical block size %u\n", 339 logical_block_size); 340 error = EINVAL; 341 goto out; 342 } 343 344 rootp = (struct iso_directory_record *) 345 (high_sierra? 346 pri_sierra->root_directory_record: 347 pri->root_directory_record); 348 349 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO); 350 isomp->im_cp = cp; 351 isomp->im_bo = bo; 352 isomp->logical_block_size = logical_block_size; 353 isomp->volume_space_size = 354 isonum_733 (high_sierra? 355 pri_sierra->volume_space_size: 356 pri->volume_space_size); 357 isomp->joliet_level = 0; 358 /* 359 * Since an ISO9660 multi-session CD can also access previous 360 * sessions, we have to include them into the space consider- 361 * ations. This doesn't yield a very accurate number since 362 * parts of the old sessions might be inaccessible now, but we 363 * can't do much better. This is also important for the NFS 364 * filehandle validation. 365 */ 366 isomp->volume_space_size += ssector; 367 memcpy(isomp->root, rootp, sizeof isomp->root); 368 isomp->root_extent = isonum_733 (rootp->extent); 369 isomp->root_size = isonum_733 (rootp->size); 370 371 isomp->im_bmask = logical_block_size - 1; 372 isomp->im_bshift = ffs(logical_block_size) - 1; 373 374 pribp->b_flags |= B_AGE; 375 brelse(pribp); 376 pribp = NULL; 377 rootp = NULL; 378 pri = NULL; 379 pri_sierra = NULL; 380 381 mp->mnt_data = isomp; 382 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 383 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 384 MNT_ILOCK(mp); 385 if (isverified) 386 mp->mnt_flag |= MNT_VERIFIED; 387 mp->mnt_flag |= MNT_LOCAL; 388 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; 389 MNT_IUNLOCK(mp); 390 isomp->im_mountp = mp; 391 isomp->im_dev = dev; 392 isomp->im_devvp = devvp; 393 394 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP); 395 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS); 396 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT); 397 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET); 398 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV); 399 400 /* Check the Rock Ridge Extension support */ 401 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) { 402 if ((error = bread(isomp->im_devvp, (isomp->root_extent + 403 isonum_711(((struct iso_directory_record *)isomp->root)-> 404 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT), 405 isomp->logical_block_size, NOCRED, &bp)) != 0) 406 goto out; 407 408 rootp = (struct iso_directory_record *)bp->b_data; 409 410 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 411 isomp->im_flags |= ISOFSMNT_NORRIP; 412 } else { 413 isomp->im_flags &= ~ISOFSMNT_GENS; 414 } 415 416 /* 417 * The contents are valid, 418 * but they will get reread as part of another vnode, so... 419 */ 420 bp->b_flags |= B_AGE; 421 brelse(bp); 422 bp = NULL; 423 rootp = NULL; 424 } 425 426 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 427 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error); 428 if (error) 429 goto out; 430 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error); 431 if (error) 432 goto out; 433 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 434 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 435 } else { 436 isomp->im_d2l = NULL; 437 isomp->im_l2d = NULL; 438 } 439 440 if (high_sierra) { 441 /* this effectively ignores all the mount flags */ 442 if (bootverbose) 443 log(LOG_INFO, "cd9660: High Sierra Format\n"); 444 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 445 } else 446 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 447 default: 448 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 449 break; 450 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 451 isomp->iso_ftype = ISO_FTYPE_9660; 452 break; 453 case 0: 454 if (bootverbose) 455 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 456 isomp->iso_ftype = ISO_FTYPE_RRIP; 457 break; 458 } 459 460 /* Decide whether to use the Joliet descriptor */ 461 462 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 463 if (bootverbose) 464 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", 465 joliet_level); 466 rootp = (struct iso_directory_record *) 467 sup->root_directory_record; 468 memcpy(isomp->root, rootp, sizeof isomp->root); 469 isomp->root_extent = isonum_733 (rootp->extent); 470 isomp->root_size = isonum_733 (rootp->size); 471 isomp->joliet_level = joliet_level; 472 supbp->b_flags |= B_AGE; 473 } 474 475 if (supbp) { 476 brelse(supbp); 477 supbp = NULL; 478 sup = NULL; 479 } 480 481 return 0; 482 out: 483 if (bp != NULL) 484 brelse(bp); 485 if (pribp != NULL) 486 brelse(pribp); 487 if (supbp != NULL) 488 brelse(supbp); 489 if (cp != NULL) { 490 g_topology_lock(); 491 g_vfs_close(cp); 492 g_topology_unlock(); 493 } 494 if (isomp) { 495 free(isomp, M_ISOFSMNT); 496 mp->mnt_data = NULL; 497 } 498 dev_rel(dev); 499 return error; 500 } 501 502 /* 503 * unmount system call 504 */ 505 static int 506 cd9660_unmount(struct mount *mp, int mntflags) 507 { 508 struct iso_mnt *isomp; 509 int error, flags = 0; 510 511 if (mntflags & MNT_FORCE) 512 flags |= FORCECLOSE; 513 if ((error = vflush(mp, 0, flags, curthread))) 514 return (error); 515 516 isomp = VFSTOISOFS(mp); 517 518 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 519 if (isomp->im_d2l) 520 cd9660_iconv->close(isomp->im_d2l); 521 if (isomp->im_l2d) 522 cd9660_iconv->close(isomp->im_l2d); 523 } 524 g_topology_lock(); 525 g_vfs_close(isomp->im_cp); 526 g_topology_unlock(); 527 vrele(isomp->im_devvp); 528 dev_rel(isomp->im_dev); 529 free(isomp, M_ISOFSMNT); 530 mp->mnt_data = NULL; 531 return (error); 532 } 533 534 /* 535 * Return root of a filesystem 536 */ 537 static int 538 cd9660_root(struct mount *mp, int flags, struct vnode **vpp) 539 { 540 struct iso_mnt *imp = VFSTOISOFS(mp); 541 struct iso_directory_record *dp = 542 (struct iso_directory_record *)imp->root; 543 cd_ino_t ino = isodirino(dp, imp); 544 545 /* 546 * With RRIP we must use the `.' entry of the root directory. 547 * Simply tell vget, that it's a relocated directory. 548 */ 549 return (cd9660_vget_internal(mp, ino, flags, vpp, 550 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 551 } 552 553 /* 554 * Get filesystem statistics. 555 */ 556 static int 557 cd9660_statfs(struct mount *mp, struct statfs *sbp) 558 { 559 struct iso_mnt *isomp; 560 561 isomp = VFSTOISOFS(mp); 562 563 sbp->f_bsize = isomp->logical_block_size; 564 sbp->f_iosize = sbp->f_bsize; /* XXX */ 565 sbp->f_blocks = isomp->volume_space_size; 566 sbp->f_bfree = 0; /* total free blocks */ 567 sbp->f_bavail = 0; /* blocks free for non superuser */ 568 sbp->f_files = 0; /* total files */ 569 sbp->f_ffree = 0; /* free file nodes */ 570 return 0; 571 } 572 573 /* 574 * File handle to vnode 575 * 576 * Have to be really careful about stale file handles: 577 * - check that the inode number is in range 578 * - call iget() to get the locked inode 579 * - check for an unallocated inode (i_mode == 0) 580 * - check that the generation number matches 581 */ 582 583 /* ARGSUSED */ 584 static int 585 cd9660_fhtovp(struct mount *mp, struct fid *fhp, int flags, struct vnode **vpp) 586 { 587 struct ifid ifh; 588 struct iso_node *ip; 589 struct vnode *nvp; 590 int error; 591 592 memcpy(&ifh, fhp, sizeof(ifh)); 593 594 #ifdef ISOFS_DBG 595 printf("fhtovp: ino %d, start %ld\n", 596 ifh.ifid_ino, ifh.ifid_start); 597 #endif 598 599 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 600 *vpp = NULLVP; 601 return (error); 602 } 603 ip = VTOI(nvp); 604 if (ip->inode.iso_mode == 0) { 605 vput(nvp); 606 *vpp = NULLVP; 607 return (ESTALE); 608 } 609 *vpp = nvp; 610 vnode_create_vobject(*vpp, ip->i_size, curthread); 611 return (0); 612 } 613 614 /* 615 * Conform to standard VFS interface; can't vget arbitrary inodes beyond 4GB 616 * into media with current inode scheme and 32-bit ino_t. This shouldn't be 617 * needed for anything other than nfsd, and who exports a mounted DVD over NFS? 618 */ 619 static int 620 cd9660_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 621 { 622 623 /* 624 * XXXX 625 * It would be nice if we didn't always set the `relocated' flag 626 * and force the extra read, but I don't want to think about fixing 627 * that right now. 628 */ 629 return (cd9660_vget_internal(mp, ino, flags, vpp, 630 #if 0 631 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 632 #else 633 0, 634 #endif 635 (struct iso_directory_record *)0)); 636 } 637 638 /* Use special comparator for full 64-bit ino comparison. */ 639 static int 640 cd9660_vfs_hash_cmp(struct vnode *vp, void *pino) 641 { 642 struct iso_node *ip; 643 cd_ino_t ino; 644 645 ip = VTOI(vp); 646 ino = *(cd_ino_t *)pino; 647 return (ip->i_number != ino); 648 } 649 650 int 651 cd9660_vget_internal(struct mount *mp, cd_ino_t ino, int flags, 652 struct vnode **vpp, int relocated, struct iso_directory_record *isodir) 653 { 654 struct iso_mnt *imp; 655 struct iso_node *ip; 656 struct buf *bp; 657 struct vnode *vp; 658 int error; 659 struct thread *td; 660 661 td = curthread; 662 error = vfs_hash_get(mp, ino, flags, td, vpp, cd9660_vfs_hash_cmp, 663 &ino); 664 if (error || *vpp != NULL) 665 return (error); 666 667 /* 668 * We must promote to an exclusive lock for vnode creation. This 669 * can happen if lookup is passed LOCKSHARED. 670 */ 671 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 672 flags &= ~LK_TYPE_MASK; 673 flags |= LK_EXCLUSIVE; 674 } 675 676 /* 677 * We do not lock vnode creation as it is believed to be too 678 * expensive for such rare case as simultaneous creation of vnode 679 * for same ino by different processes. We just allow them to race 680 * and check later to decide who wins. Let the race begin! 681 */ 682 683 imp = VFSTOISOFS(mp); 684 685 /* Allocate a new vnode/iso_node. */ 686 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) { 687 *vpp = NULLVP; 688 return (error); 689 } 690 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE, 691 M_WAITOK | M_ZERO); 692 vp->v_data = ip; 693 ip->i_vnode = vp; 694 ip->i_number = ino; 695 696 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 697 error = insmntque(vp, mp); 698 if (error != 0) { 699 free(ip, M_ISOFSNODE); 700 *vpp = NULLVP; 701 return (error); 702 } 703 error = vfs_hash_insert(vp, ino, flags, td, vpp, cd9660_vfs_hash_cmp, 704 &ino); 705 if (error || *vpp != NULL) 706 return (error); 707 708 if (isodir == NULL) { 709 int lbn, off; 710 711 lbn = lblkno(imp, ino); 712 if (lbn >= imp->volume_space_size) { 713 vput(vp); 714 printf("fhtovp: lbn exceed volume space %d\n", lbn); 715 return (ESTALE); 716 } 717 718 off = blkoff(imp, ino); 719 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 720 vput(vp); 721 printf("fhtovp: crosses block boundary %d\n", 722 off + ISO_DIRECTORY_RECORD_SIZE); 723 return (ESTALE); 724 } 725 726 error = bread(imp->im_devvp, 727 lbn << (imp->im_bshift - DEV_BSHIFT), 728 imp->logical_block_size, NOCRED, &bp); 729 if (error) { 730 vput(vp); 731 printf("fhtovp: bread error %d\n",error); 732 return (error); 733 } 734 isodir = (struct iso_directory_record *)(bp->b_data + off); 735 736 if (off + isonum_711(isodir->length) > 737 imp->logical_block_size) { 738 vput(vp); 739 brelse(bp); 740 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 741 off +isonum_711(isodir->length), off, 742 isonum_711(isodir->length)); 743 return (ESTALE); 744 } 745 746 #if 0 747 if (isonum_733(isodir->extent) + 748 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 749 brelse(bp); 750 printf("fhtovp: file start miss %d vs %d\n", 751 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 752 ifhp->ifid_start); 753 return (ESTALE); 754 } 755 #endif 756 } else 757 bp = NULL; 758 759 ip->i_mnt = imp; 760 761 if (relocated) { 762 /* 763 * On relocated directories we must 764 * read the `.' entry out of a dir. 765 */ 766 ip->iso_start = ino >> imp->im_bshift; 767 if (bp != NULL) 768 brelse(bp); 769 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 770 vput(vp); 771 return (error); 772 } 773 isodir = (struct iso_directory_record *)bp->b_data; 774 } 775 776 ip->iso_extent = isonum_733(isodir->extent); 777 ip->i_size = isonum_733(isodir->size); 778 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 779 780 /* 781 * Setup time stamp, attribute 782 */ 783 vp->v_type = VNON; 784 switch (imp->iso_ftype) { 785 default: /* ISO_FTYPE_9660 */ 786 { 787 struct buf *bp2; 788 int off; 789 if ((imp->im_flags & ISOFSMNT_EXTATT) 790 && (off = isonum_711(isodir->ext_attr_length))) 791 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 792 &bp2); 793 else 794 bp2 = NULL; 795 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 796 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 797 if (bp2) 798 brelse(bp2); 799 break; 800 } 801 case ISO_FTYPE_RRIP: 802 cd9660_rrip_analyze(isodir, ip, imp); 803 break; 804 } 805 806 brelse(bp); 807 808 /* 809 * Initialize the associated vnode 810 */ 811 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 812 case VFIFO: 813 vp->v_op = &cd9660_fifoops; 814 break; 815 default: 816 VN_LOCK_ASHARE(vp); 817 break; 818 } 819 820 if (ip->iso_extent == imp->root_extent) 821 vp->v_vflag |= VV_ROOT; 822 823 /* 824 * XXX need generation number? 825 */ 826 827 vn_set_state(vp, VSTATE_CONSTRUCTED); 828 *vpp = vp; 829 return (0); 830 } 831