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sys/fs/cd9660/cd9660_vfsops.c
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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 __FBSDID("$FreeBSD$"); 41 42 #include <sys/param.h> 43 #include <sys/systm.h> 44 #include <sys/namei.h> 45 #include <sys/priv.h> 46 #include <sys/proc.h> 47 #include <sys/kernel.h> 48 #include <sys/vnode.h> 49 #include <sys/mount.h> 50 #include <sys/bio.h> 51 #include <sys/buf.h> 52 #include <sys/cdio.h> 53 #include <sys/conf.h> 54 #include <sys/fcntl.h> 55 #include <sys/malloc.h> 56 #include <sys/stat.h> 57 #include <sys/syslog.h> 58 #include <sys/iconv.h> 59 60 #include <fs/cd9660/iso.h> 61 #include <fs/cd9660/iso_rrip.h> 62 #include <fs/cd9660/cd9660_node.h> 63 #include <fs/cd9660/cd9660_mount.h> 64 65 #include <geom/geom.h> 66 #include <geom/geom_vfs.h> 67 68 MALLOC_DEFINE(M_ISOFSMNT, "isofs_mount", "ISOFS mount structure"); 69 MALLOC_DEFINE(M_ISOFSNODE, "isofs_node", "ISOFS vnode private part"); 70 71 struct iconv_functions *cd9660_iconv = NULL; 72 73 static vfs_mount_t cd9660_mount; 74 static vfs_cmount_t cd9660_cmount; 75 static vfs_unmount_t cd9660_unmount; 76 static vfs_root_t cd9660_root; 77 static vfs_statfs_t cd9660_statfs; 78 static vfs_vget_t cd9660_vget; 79 static vfs_fhtovp_t cd9660_fhtovp; 80 81 static struct vfsops cd9660_vfsops = { 82 .vfs_fhtovp = cd9660_fhtovp, 83 .vfs_mount = cd9660_mount, 84 .vfs_cmount = cd9660_cmount, 85 .vfs_root = cd9660_root, 86 .vfs_statfs = cd9660_statfs, 87 .vfs_unmount = cd9660_unmount, 88 .vfs_vget = cd9660_vget, 89 }; 90 VFS_SET(cd9660_vfsops, cd9660, VFCF_READONLY); 91 MODULE_VERSION(cd9660, 1); 92 93 static int cd9660_vfs_hash_cmp(struct vnode *vp, void *pino); 94 static int iso_mountfs(struct vnode *devvp, struct mount *mp); 95 96 /* 97 * VFS Operations. 98 */ 99 100 static int 101 cd9660_cmount(struct mntarg *ma, void *data, uint64_t flags) 102 { 103 struct iso_args args; 104 int error; 105 106 error = copyin(data, &args, sizeof args); 107 if (error) 108 return (error); 109 110 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 111 ma = mount_arg(ma, "export", &args.export, sizeof(args.export)); 112 ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64); 113 ma = mount_argsu(ma, "cs_local", args.cs_local, 64); 114 ma = mount_argf(ma, "ssector", "%u", args.ssector); 115 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip"); 116 ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens"); 117 ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt"); 118 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet"); 119 ma = mount_argb(ma, 120 args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet"); 121 ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv"); 122 123 error = kernel_mount(ma, flags); 124 125 return (error); 126 } 127 128 static int 129 cd9660_mount(struct mount *mp) 130 { 131 struct vnode *devvp; 132 struct thread *td; 133 char *fspec; 134 int error; 135 accmode_t accmode; 136 struct nameidata ndp; 137 struct iso_mnt *imp = NULL; 138 139 td = curthread; 140 141 /* 142 * Unconditionally mount as read-only. 143 */ 144 MNT_ILOCK(mp); 145 mp->mnt_flag |= MNT_RDONLY; 146 MNT_IUNLOCK(mp); 147 148 fspec = vfs_getopts(mp->mnt_optnew, "from", &error); 149 if (error) 150 return (error); 151 152 imp = VFSTOISOFS(mp); 153 154 if (mp->mnt_flag & MNT_UPDATE) { 155 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) 156 return (0); 157 } 158 /* 159 * Not an update, or updating the name: look up the name 160 * and verify that it refers to a sensible block device. 161 */ 162 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 163 if ((error = namei(&ndp))) 164 return (error); 165 NDFREE(&ndp, NDF_ONLY_PNBUF); 166 devvp = ndp.ni_vp; 167 168 if (!vn_isdisk_error(devvp, &error)) { 169 vput(devvp); 170 return (error); 171 } 172 173 /* 174 * Verify that user has necessary permissions on the device, 175 * or has superuser abilities 176 */ 177 accmode = VREAD; 178 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 179 if (error) 180 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 181 if (error) { 182 vput(devvp); 183 return (error); 184 } 185 186 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 187 error = iso_mountfs(devvp, mp); 188 if (error) 189 vrele(devvp); 190 } else { 191 if (devvp != imp->im_devvp) 192 error = EINVAL; /* needs translation */ 193 vput(devvp); 194 } 195 if (error) 196 return (error); 197 vfs_mountedfrom(mp, fspec); 198 return (0); 199 } 200 201 /* 202 * Common code for mount and mountroot 203 */ 204 static int 205 iso_mountfs(devvp, mp) 206 struct vnode *devvp; 207 struct mount *mp; 208 { 209 struct iso_mnt *isomp = NULL; 210 struct buf *bp = NULL; 211 struct buf *pribp = NULL, *supbp = NULL; 212 struct cdev *dev; 213 int error = EINVAL; 214 int high_sierra = 0; 215 int iso_bsize; 216 int iso_blknum; 217 int joliet_level; 218 int isverified = 0; 219 struct iso_volume_descriptor *vdp = NULL; 220 struct iso_primary_descriptor *pri = NULL; 221 struct iso_sierra_primary_descriptor *pri_sierra = NULL; 222 struct iso_supplementary_descriptor *sup = NULL; 223 struct iso_directory_record *rootp; 224 int logical_block_size, ssector; 225 struct g_consumer *cp; 226 struct bufobj *bo; 227 char *cs_local, *cs_disk; 228 229 dev = devvp->v_rdev; 230 dev_ref(dev); 231 g_topology_lock(); 232 error = g_vfs_open(devvp, &cp, "cd9660", 0); 233 if (error == 0) 234 g_getattr("MNT::verified", cp, &isverified); 235 g_topology_unlock(); 236 VOP_UNLOCK(devvp); 237 if (error) 238 goto out; 239 if (devvp->v_rdev->si_iosize_max != 0) 240 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 241 if (mp->mnt_iosize_max > maxphys) 242 mp->mnt_iosize_max = maxphys; 243 244 bo = &devvp->v_bufobj; 245 246 /* This is the "logical sector size". The standard says this 247 * should be 2048 or the physical sector size on the device, 248 * whichever is greater. 249 */ 250 if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) { 251 error = EINVAL; 252 goto out; 253 } 254 255 iso_bsize = cp->provider->sectorsize; 256 257 joliet_level = 0; 258 if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector)) 259 ssector = 0; 260 for (iso_blknum = 16 + ssector; 261 iso_blknum < 100 + ssector; 262 iso_blknum++) { 263 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE), 264 iso_bsize, NOCRED, &bp)) != 0) 265 goto out; 266 267 vdp = (struct iso_volume_descriptor *)bp->b_data; 268 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) { 269 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID, 270 sizeof vdp->id_sierra) != 0) { 271 error = EINVAL; 272 goto out; 273 } else 274 high_sierra = 1; 275 } 276 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){ 277 case ISO_VD_PRIMARY: 278 if (pribp == NULL) { 279 pribp = bp; 280 bp = NULL; 281 pri = (struct iso_primary_descriptor *)vdp; 282 pri_sierra = 283 (struct iso_sierra_primary_descriptor *)vdp; 284 } 285 break; 286 287 case ISO_VD_SUPPLEMENTARY: 288 if (supbp == NULL) { 289 supbp = bp; 290 bp = NULL; 291 sup = (struct iso_supplementary_descriptor *)vdp; 292 293 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) { 294 if (bcmp(sup->escape, "%/@", 3) == 0) 295 joliet_level = 1; 296 if (bcmp(sup->escape, "%/C", 3) == 0) 297 joliet_level = 2; 298 if (bcmp(sup->escape, "%/E", 3) == 0) 299 joliet_level = 3; 300 301 if ((isonum_711 (sup->flags) & 1) && 302 !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0)) 303 joliet_level = 0; 304 } 305 } 306 break; 307 308 case ISO_VD_END: 309 goto vd_end; 310 311 default: 312 break; 313 } 314 if (bp != NULL) { 315 brelse(bp); 316 bp = NULL; 317 } 318 } 319 vd_end: 320 if (bp != NULL) { 321 brelse(bp); 322 bp = NULL; 323 } 324 325 if (pri == NULL) { 326 error = EINVAL; 327 goto out; 328 } 329 330 logical_block_size = 331 isonum_723 (high_sierra? 332 pri_sierra->logical_block_size: 333 pri->logical_block_size); 334 335 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 336 || (logical_block_size & (logical_block_size - 1)) != 0) { 337 error = EINVAL; 338 goto out; 339 } 340 341 rootp = (struct iso_directory_record *) 342 (high_sierra? 343 pri_sierra->root_directory_record: 344 pri->root_directory_record); 345 346 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO); 347 isomp->im_cp = cp; 348 isomp->im_bo = bo; 349 isomp->logical_block_size = logical_block_size; 350 isomp->volume_space_size = 351 isonum_733 (high_sierra? 352 pri_sierra->volume_space_size: 353 pri->volume_space_size); 354 isomp->joliet_level = 0; 355 /* 356 * Since an ISO9660 multi-session CD can also access previous 357 * sessions, we have to include them into the space consider- 358 * ations. This doesn't yield a very accurate number since 359 * parts of the old sessions might be inaccessible now, but we 360 * can't do much better. This is also important for the NFS 361 * filehandle validation. 362 */ 363 isomp->volume_space_size += ssector; 364 memcpy(isomp->root, rootp, sizeof isomp->root); 365 isomp->root_extent = isonum_733 (rootp->extent); 366 isomp->root_size = isonum_733 (rootp->size); 367 368 isomp->im_bmask = logical_block_size - 1; 369 isomp->im_bshift = ffs(logical_block_size) - 1; 370 371 pribp->b_flags |= B_AGE; 372 brelse(pribp); 373 pribp = NULL; 374 rootp = NULL; 375 pri = NULL; 376 pri_sierra = NULL; 377 378 mp->mnt_data = isomp; 379 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 380 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 381 mp->mnt_maxsymlinklen = 0; 382 MNT_ILOCK(mp); 383 if (isverified) 384 mp->mnt_flag |= MNT_VERIFIED; 385 mp->mnt_flag |= MNT_LOCAL; 386 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; 387 MNT_IUNLOCK(mp); 388 isomp->im_mountp = mp; 389 isomp->im_dev = dev; 390 isomp->im_devvp = devvp; 391 392 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP); 393 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS); 394 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT); 395 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET); 396 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV); 397 398 /* Check the Rock Ridge Extension support */ 399 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) { 400 if ((error = bread(isomp->im_devvp, (isomp->root_extent + 401 isonum_711(((struct iso_directory_record *)isomp->root)-> 402 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT), 403 isomp->logical_block_size, NOCRED, &bp)) != 0) 404 goto out; 405 406 rootp = (struct iso_directory_record *)bp->b_data; 407 408 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 409 isomp->im_flags |= ISOFSMNT_NORRIP; 410 } else { 411 isomp->im_flags &= ~ISOFSMNT_GENS; 412 } 413 414 /* 415 * The contents are valid, 416 * but they will get reread as part of another vnode, so... 417 */ 418 bp->b_flags |= B_AGE; 419 brelse(bp); 420 bp = NULL; 421 rootp = NULL; 422 } 423 424 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 425 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error); 426 if (error) 427 goto out; 428 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error); 429 if (error) 430 goto out; 431 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 432 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 433 } else { 434 isomp->im_d2l = NULL; 435 isomp->im_l2d = NULL; 436 } 437 438 if (high_sierra) { 439 /* this effectively ignores all the mount flags */ 440 if (bootverbose) 441 log(LOG_INFO, "cd9660: High Sierra Format\n"); 442 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 443 } else 444 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 445 default: 446 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 447 break; 448 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 449 isomp->iso_ftype = ISO_FTYPE_9660; 450 break; 451 case 0: 452 if (bootverbose) 453 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 454 isomp->iso_ftype = ISO_FTYPE_RRIP; 455 break; 456 } 457 458 /* Decide whether to use the Joliet descriptor */ 459 460 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 461 if (bootverbose) 462 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", 463 joliet_level); 464 rootp = (struct iso_directory_record *) 465 sup->root_directory_record; 466 memcpy(isomp->root, rootp, sizeof isomp->root); 467 isomp->root_extent = isonum_733 (rootp->extent); 468 isomp->root_size = isonum_733 (rootp->size); 469 isomp->joliet_level = joliet_level; 470 supbp->b_flags |= B_AGE; 471 } 472 473 if (supbp) { 474 brelse(supbp); 475 supbp = NULL; 476 sup = NULL; 477 } 478 479 return 0; 480 out: 481 if (bp != NULL) 482 brelse(bp); 483 if (pribp != NULL) 484 brelse(pribp); 485 if (supbp != NULL) 486 brelse(supbp); 487 if (cp != NULL) { 488 g_topology_lock(); 489 g_vfs_close(cp); 490 g_topology_unlock(); 491 } 492 if (isomp) { 493 free(isomp, M_ISOFSMNT); 494 mp->mnt_data = NULL; 495 } 496 dev_rel(dev); 497 return error; 498 } 499 500 /* 501 * unmount system call 502 */ 503 static int 504 cd9660_unmount(mp, mntflags) 505 struct mount *mp; 506 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 MNT_ILOCK(mp); 532 mp->mnt_flag &= ~MNT_LOCAL; 533 MNT_IUNLOCK(mp); 534 return (error); 535 } 536 537 /* 538 * Return root of a filesystem 539 */ 540 static int 541 cd9660_root(mp, flags, vpp) 542 struct mount *mp; 543 int flags; 544 struct vnode **vpp; 545 { 546 struct iso_mnt *imp = VFSTOISOFS(mp); 547 struct iso_directory_record *dp = 548 (struct iso_directory_record *)imp->root; 549 cd_ino_t ino = isodirino(dp, imp); 550 551 /* 552 * With RRIP we must use the `.' entry of the root directory. 553 * Simply tell vget, that it's a relocated directory. 554 */ 555 return (cd9660_vget_internal(mp, ino, flags, vpp, 556 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 557 } 558 559 /* 560 * Get filesystem statistics. 561 */ 562 static int 563 cd9660_statfs(mp, sbp) 564 struct mount *mp; 565 struct statfs *sbp; 566 { 567 struct iso_mnt *isomp; 568 569 isomp = VFSTOISOFS(mp); 570 571 sbp->f_bsize = isomp->logical_block_size; 572 sbp->f_iosize = sbp->f_bsize; /* XXX */ 573 sbp->f_blocks = isomp->volume_space_size; 574 sbp->f_bfree = 0; /* total free blocks */ 575 sbp->f_bavail = 0; /* blocks free for non superuser */ 576 sbp->f_files = 0; /* total files */ 577 sbp->f_ffree = 0; /* free file nodes */ 578 return 0; 579 } 580 581 /* 582 * File handle to vnode 583 * 584 * Have to be really careful about stale file handles: 585 * - check that the inode number is in range 586 * - call iget() to get the locked inode 587 * - check for an unallocated inode (i_mode == 0) 588 * - check that the generation number matches 589 */ 590 591 /* ARGSUSED */ 592 static int 593 cd9660_fhtovp(mp, fhp, flags, vpp) 594 struct mount *mp; 595 struct fid *fhp; 596 int flags; 597 struct vnode **vpp; 598 { 599 struct ifid ifh; 600 struct iso_node *ip; 601 struct vnode *nvp; 602 int error; 603 604 memcpy(&ifh, fhp, sizeof(ifh)); 605 606 #ifdef ISOFS_DBG 607 printf("fhtovp: ino %d, start %ld\n", 608 ifh.ifid_ino, ifh.ifid_start); 609 #endif 610 611 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 612 *vpp = NULLVP; 613 return (error); 614 } 615 ip = VTOI(nvp); 616 if (ip->inode.iso_mode == 0) { 617 vput(nvp); 618 *vpp = NULLVP; 619 return (ESTALE); 620 } 621 *vpp = nvp; 622 vnode_create_vobject(*vpp, ip->i_size, curthread); 623 return (0); 624 } 625 626 /* 627 * Conform to standard VFS interface; can't vget arbitrary inodes beyond 4GB 628 * into media with current inode scheme and 32-bit ino_t. This shouldn't be 629 * needed for anything other than nfsd, and who exports a mounted DVD over NFS? 630 */ 631 static int 632 cd9660_vget(mp, ino, flags, vpp) 633 struct mount *mp; 634 ino_t ino; 635 int flags; 636 struct vnode **vpp; 637 { 638 639 /* 640 * XXXX 641 * It would be nice if we didn't always set the `relocated' flag 642 * and force the extra read, but I don't want to think about fixing 643 * that right now. 644 */ 645 return (cd9660_vget_internal(mp, ino, flags, vpp, 646 #if 0 647 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 648 #else 649 0, 650 #endif 651 (struct iso_directory_record *)0)); 652 } 653 654 /* Use special comparator for full 64-bit ino comparison. */ 655 static int 656 cd9660_vfs_hash_cmp(vp, pino) 657 struct vnode *vp; 658 void *pino; 659 { 660 struct iso_node *ip; 661 cd_ino_t ino; 662 663 ip = VTOI(vp); 664 ino = *(cd_ino_t *)pino; 665 return (ip->i_number != ino); 666 } 667 668 int 669 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir) 670 struct mount *mp; 671 cd_ino_t ino; 672 int flags; 673 struct vnode **vpp; 674 int relocated; 675 struct iso_directory_record *isodir; 676 { 677 struct iso_mnt *imp; 678 struct iso_node *ip; 679 struct buf *bp; 680 struct vnode *vp; 681 int error; 682 struct thread *td; 683 684 td = curthread; 685 error = vfs_hash_get(mp, ino, flags, td, vpp, cd9660_vfs_hash_cmp, 686 &ino); 687 if (error || *vpp != NULL) 688 return (error); 689 690 /* 691 * We must promote to an exclusive lock for vnode creation. This 692 * can happen if lookup is passed LOCKSHARED. 693 */ 694 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 695 flags &= ~LK_TYPE_MASK; 696 flags |= LK_EXCLUSIVE; 697 } 698 699 /* 700 * We do not lock vnode creation as it is believed to be too 701 * expensive for such rare case as simultaneous creation of vnode 702 * for same ino by different processes. We just allow them to race 703 * and check later to decide who wins. Let the race begin! 704 */ 705 706 imp = VFSTOISOFS(mp); 707 708 /* Allocate a new vnode/iso_node. */ 709 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) { 710 *vpp = NULLVP; 711 return (error); 712 } 713 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE, 714 M_WAITOK | M_ZERO); 715 vp->v_data = ip; 716 ip->i_vnode = vp; 717 ip->i_number = ino; 718 719 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 720 error = insmntque(vp, mp); 721 if (error != 0) { 722 free(ip, M_ISOFSNODE); 723 *vpp = NULLVP; 724 return (error); 725 } 726 error = vfs_hash_insert(vp, ino, flags, td, vpp, cd9660_vfs_hash_cmp, 727 &ino); 728 if (error || *vpp != NULL) 729 return (error); 730 731 if (isodir == NULL) { 732 int lbn, off; 733 734 lbn = lblkno(imp, ino); 735 if (lbn >= imp->volume_space_size) { 736 vput(vp); 737 printf("fhtovp: lbn exceed volume space %d\n", lbn); 738 return (ESTALE); 739 } 740 741 off = blkoff(imp, ino); 742 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 743 vput(vp); 744 printf("fhtovp: crosses block boundary %d\n", 745 off + ISO_DIRECTORY_RECORD_SIZE); 746 return (ESTALE); 747 } 748 749 error = bread(imp->im_devvp, 750 lbn << (imp->im_bshift - DEV_BSHIFT), 751 imp->logical_block_size, NOCRED, &bp); 752 if (error) { 753 vput(vp); 754 printf("fhtovp: bread error %d\n",error); 755 return (error); 756 } 757 isodir = (struct iso_directory_record *)(bp->b_data + off); 758 759 if (off + isonum_711(isodir->length) > 760 imp->logical_block_size) { 761 vput(vp); 762 brelse(bp); 763 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 764 off +isonum_711(isodir->length), off, 765 isonum_711(isodir->length)); 766 return (ESTALE); 767 } 768 769 #if 0 770 if (isonum_733(isodir->extent) + 771 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 772 brelse(bp); 773 printf("fhtovp: file start miss %d vs %d\n", 774 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 775 ifhp->ifid_start); 776 return (ESTALE); 777 } 778 #endif 779 } else 780 bp = NULL; 781 782 ip->i_mnt = imp; 783 784 if (relocated) { 785 /* 786 * On relocated directories we must 787 * read the `.' entry out of a dir. 788 */ 789 ip->iso_start = ino >> imp->im_bshift; 790 if (bp != NULL) 791 brelse(bp); 792 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 793 vput(vp); 794 return (error); 795 } 796 isodir = (struct iso_directory_record *)bp->b_data; 797 } 798 799 ip->iso_extent = isonum_733(isodir->extent); 800 ip->i_size = isonum_733(isodir->size); 801 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 802 803 /* 804 * Setup time stamp, attribute 805 */ 806 vp->v_type = VNON; 807 switch (imp->iso_ftype) { 808 default: /* ISO_FTYPE_9660 */ 809 { 810 struct buf *bp2; 811 int off; 812 if ((imp->im_flags & ISOFSMNT_EXTATT) 813 && (off = isonum_711(isodir->ext_attr_length))) 814 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 815 &bp2); 816 else 817 bp2 = NULL; 818 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 819 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 820 if (bp2) 821 brelse(bp2); 822 break; 823 } 824 case ISO_FTYPE_RRIP: 825 cd9660_rrip_analyze(isodir, ip, imp); 826 break; 827 } 828 829 brelse(bp); 830 831 /* 832 * Initialize the associated vnode 833 */ 834 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 835 case VFIFO: 836 vp->v_op = &cd9660_fifoops; 837 break; 838 default: 839 VN_LOCK_ASHARE(vp); 840 break; 841 } 842 843 if (ip->iso_extent == imp->root_extent) 844 vp->v_vflag |= VV_ROOT; 845 846 /* 847 * XXX need generation number? 848 */ 849 850 *vpp = vp; 851 return (0); 852 }
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