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sys/fs/cd9660/cd9660_vfsops.c
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1 /*- 2 * Copyright (c) 1994 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 * 4. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 * 34 * @(#)cd9660_vfsops.c 8.18 (Berkeley) 5/22/95 35 */ 36 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 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 iso_mountfs(struct vnode *devvp, struct mount *mp); 92 93 /* 94 * VFS Operations. 95 */ 96 97 static int 98 cd9660_cmount(struct mntarg *ma, void *data, uint64_t flags) 99 { 100 struct iso_args args; 101 struct export_args exp; 102 int error; 103 104 error = copyin(data, &args, sizeof args); 105 if (error) 106 return (error); 107 vfs_oexport_conv(&args.export, &exp); 108 109 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 110 ma = mount_arg(ma, "export", &exp, sizeof(exp)); 111 ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64); 112 ma = mount_argsu(ma, "cs_local", args.cs_local, 64); 113 ma = mount_argf(ma, "ssector", "%u", args.ssector); 114 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip"); 115 ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens"); 116 ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt"); 117 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet"); 118 ma = mount_argb(ma, 119 args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet"); 120 ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv"); 121 122 error = kernel_mount(ma, flags); 123 124 return (error); 125 } 126 127 static int 128 cd9660_mount(struct mount *mp) 129 { 130 struct vnode *devvp; 131 struct thread *td; 132 char *fspec; 133 int error; 134 accmode_t accmode; 135 struct nameidata ndp; 136 struct iso_mnt *imp = NULL; 137 138 td = curthread; 139 140 /* 141 * Unconditionally mount as read-only. 142 */ 143 MNT_ILOCK(mp); 144 mp->mnt_flag |= MNT_RDONLY; 145 MNT_IUNLOCK(mp); 146 147 fspec = vfs_getopts(mp->mnt_optnew, "from", &error); 148 if (error) 149 return (error); 150 151 imp = VFSTOISOFS(mp); 152 153 if (mp->mnt_flag & MNT_UPDATE) { 154 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) 155 return (0); 156 } 157 /* 158 * Not an update, or updating the name: look up the name 159 * and verify that it refers to a sensible block device. 160 */ 161 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 162 if ((error = namei(&ndp))) 163 return (error); 164 NDFREE(&ndp, NDF_ONLY_PNBUF); 165 devvp = ndp.ni_vp; 166 167 if (!vn_isdisk(devvp, &error)) { 168 vput(devvp); 169 return (error); 170 } 171 172 /* 173 * Verify that user has necessary permissions on the device, 174 * or has superuser abilities 175 */ 176 accmode = VREAD; 177 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 178 if (error) 179 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 180 if (error) { 181 vput(devvp); 182 return (error); 183 } 184 185 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 186 error = iso_mountfs(devvp, mp); 187 if (error) 188 vrele(devvp); 189 } else { 190 if (devvp != imp->im_devvp) 191 error = EINVAL; /* needs translation */ 192 vput(devvp); 193 } 194 if (error) 195 return (error); 196 vfs_mountedfrom(mp, fspec); 197 return (0); 198 } 199 200 /* 201 * Common code for mount and mountroot 202 */ 203 static int 204 iso_mountfs(devvp, mp) 205 struct vnode *devvp; 206 struct mount *mp; 207 { 208 struct iso_mnt *isomp = NULL; 209 struct buf *bp = NULL; 210 struct buf *pribp = NULL, *supbp = NULL; 211 struct cdev *dev; 212 int error = EINVAL; 213 int high_sierra = 0; 214 int iso_bsize; 215 int iso_blknum; 216 int joliet_level; 217 struct iso_volume_descriptor *vdp = NULL; 218 struct iso_primary_descriptor *pri = NULL; 219 struct iso_sierra_primary_descriptor *pri_sierra = NULL; 220 struct iso_supplementary_descriptor *sup = NULL; 221 struct iso_directory_record *rootp; 222 int logical_block_size, ssector; 223 struct g_consumer *cp; 224 struct bufobj *bo; 225 char *cs_local, *cs_disk; 226 227 dev = devvp->v_rdev; 228 dev_ref(dev); 229 g_topology_lock(); 230 error = g_vfs_open(devvp, &cp, "cd9660", 0); 231 g_topology_unlock(); 232 VOP_UNLOCK(devvp, 0); 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 rootp = (struct iso_directory_record *) 338 (high_sierra? 339 pri_sierra->root_directory_record: 340 pri->root_directory_record); 341 342 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO); 343 isomp->im_cp = cp; 344 isomp->im_bo = bo; 345 isomp->logical_block_size = logical_block_size; 346 isomp->volume_space_size = 347 isonum_733 (high_sierra? 348 pri_sierra->volume_space_size: 349 pri->volume_space_size); 350 isomp->joliet_level = 0; 351 /* 352 * Since an ISO9660 multi-session CD can also access previous 353 * sessions, we have to include them into the space consider- 354 * ations. This doesn't yield a very accurate number since 355 * parts of the old sessions might be inaccessible now, but we 356 * can't do much better. This is also important for the NFS 357 * filehandle validation. 358 */ 359 isomp->volume_space_size += ssector; 360 bcopy (rootp, isomp->root, sizeof isomp->root); 361 isomp->root_extent = isonum_733 (rootp->extent); 362 isomp->root_size = isonum_733 (rootp->size); 363 364 isomp->im_bmask = logical_block_size - 1; 365 isomp->im_bshift = ffs(logical_block_size) - 1; 366 367 pribp->b_flags |= B_AGE; 368 brelse(pribp); 369 pribp = NULL; 370 rootp = NULL; 371 pri = NULL; 372 pri_sierra = NULL; 373 374 mp->mnt_data = isomp; 375 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 376 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 377 mp->mnt_maxsymlinklen = 0; 378 MNT_ILOCK(mp); 379 mp->mnt_flag |= MNT_LOCAL; 380 mp->mnt_kern_flag |= MNTK_LOOKUP_SHARED | MNTK_EXTENDED_SHARED; 381 MNT_IUNLOCK(mp); 382 isomp->im_mountp = mp; 383 isomp->im_dev = dev; 384 isomp->im_devvp = devvp; 385 386 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP); 387 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS); 388 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT); 389 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET); 390 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV); 391 392 /* Check the Rock Ridge Extension support */ 393 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) { 394 if ((error = bread(isomp->im_devvp, (isomp->root_extent + 395 isonum_711(((struct iso_directory_record *)isomp->root)-> 396 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT), 397 isomp->logical_block_size, NOCRED, &bp)) != 0) 398 goto out; 399 400 rootp = (struct iso_directory_record *)bp->b_data; 401 402 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 403 isomp->im_flags |= ISOFSMNT_NORRIP; 404 } else { 405 isomp->im_flags &= ~ISOFSMNT_GENS; 406 } 407 408 /* 409 * The contents are valid, 410 * but they will get reread as part of another vnode, so... 411 */ 412 bp->b_flags |= B_AGE; 413 brelse(bp); 414 bp = NULL; 415 rootp = NULL; 416 } 417 418 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 419 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error); 420 if (error) 421 goto out; 422 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error); 423 if (error) 424 goto out; 425 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 426 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 427 } else { 428 isomp->im_d2l = NULL; 429 isomp->im_l2d = NULL; 430 } 431 432 if (high_sierra) { 433 /* this effectively ignores all the mount flags */ 434 if (bootverbose) 435 log(LOG_INFO, "cd9660: High Sierra Format\n"); 436 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 437 } else 438 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 439 default: 440 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 441 break; 442 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 443 isomp->iso_ftype = ISO_FTYPE_9660; 444 break; 445 case 0: 446 if (bootverbose) 447 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 448 isomp->iso_ftype = ISO_FTYPE_RRIP; 449 break; 450 } 451 452 /* Decide whether to use the Joliet descriptor */ 453 454 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 455 if (bootverbose) 456 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", 457 joliet_level); 458 rootp = (struct iso_directory_record *) 459 sup->root_directory_record; 460 bcopy (rootp, isomp->root, sizeof isomp->root); 461 isomp->root_extent = isonum_733 (rootp->extent); 462 isomp->root_size = isonum_733 (rootp->size); 463 isomp->joliet_level = joliet_level; 464 supbp->b_flags |= B_AGE; 465 } 466 467 if (supbp) { 468 brelse(supbp); 469 supbp = NULL; 470 sup = NULL; 471 } 472 473 return 0; 474 out: 475 if (bp != NULL) 476 brelse(bp); 477 if (pribp != NULL) 478 brelse(pribp); 479 if (supbp != NULL) 480 brelse(supbp); 481 if (cp != NULL) { 482 g_topology_lock(); 483 g_vfs_close(cp); 484 g_topology_unlock(); 485 } 486 if (isomp) { 487 free(isomp, M_ISOFSMNT); 488 mp->mnt_data = NULL; 489 } 490 dev_rel(dev); 491 return error; 492 } 493 494 /* 495 * unmount system call 496 */ 497 static int 498 cd9660_unmount(mp, mntflags) 499 struct mount *mp; 500 int mntflags; 501 { 502 struct iso_mnt *isomp; 503 int error, flags = 0; 504 505 if (mntflags & MNT_FORCE) 506 flags |= FORCECLOSE; 507 if ((error = vflush(mp, 0, flags, curthread))) 508 return (error); 509 510 isomp = VFSTOISOFS(mp); 511 512 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 513 if (isomp->im_d2l) 514 cd9660_iconv->close(isomp->im_d2l); 515 if (isomp->im_l2d) 516 cd9660_iconv->close(isomp->im_l2d); 517 } 518 g_topology_lock(); 519 g_vfs_close(isomp->im_cp); 520 g_topology_unlock(); 521 vrele(isomp->im_devvp); 522 dev_rel(isomp->im_dev); 523 free(isomp, M_ISOFSMNT); 524 mp->mnt_data = NULL; 525 MNT_ILOCK(mp); 526 mp->mnt_flag &= ~MNT_LOCAL; 527 MNT_IUNLOCK(mp); 528 return (error); 529 } 530 531 /* 532 * Return root of a filesystem 533 */ 534 static int 535 cd9660_root(mp, flags, vpp) 536 struct mount *mp; 537 int flags; 538 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 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(mp, sbp) 558 struct mount *mp; 559 struct statfs *sbp; 560 { 561 struct iso_mnt *isomp; 562 563 isomp = VFSTOISOFS(mp); 564 565 sbp->f_bsize = isomp->logical_block_size; 566 sbp->f_iosize = sbp->f_bsize; /* XXX */ 567 sbp->f_blocks = isomp->volume_space_size; 568 sbp->f_bfree = 0; /* total free blocks */ 569 sbp->f_bavail = 0; /* blocks free for non superuser */ 570 sbp->f_files = 0; /* total files */ 571 sbp->f_ffree = 0; /* free file nodes */ 572 return 0; 573 } 574 575 /* 576 * File handle to vnode 577 * 578 * Have to be really careful about stale file handles: 579 * - check that the inode number is in range 580 * - call iget() to get the locked inode 581 * - check for an unallocated inode (i_mode == 0) 582 * - check that the generation number matches 583 */ 584 585 /* ARGSUSED */ 586 static int 587 cd9660_fhtovp(mp, fhp, flags, vpp) 588 struct mount *mp; 589 struct fid *fhp; 590 int flags; 591 struct vnode **vpp; 592 { 593 struct ifid ifh; 594 struct iso_node *ip; 595 struct vnode *nvp; 596 int error; 597 598 memcpy(&ifh, fhp, sizeof(ifh)); 599 600 #ifdef ISOFS_DBG 601 printf("fhtovp: ino %d, start %ld\n", 602 ifh.ifid_ino, ifh.ifid_start); 603 #endif 604 605 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 606 *vpp = NULLVP; 607 return (error); 608 } 609 ip = VTOI(nvp); 610 if (ip->inode.iso_mode == 0) { 611 vput(nvp); 612 *vpp = NULLVP; 613 return (ESTALE); 614 } 615 *vpp = nvp; 616 vnode_create_vobject(*vpp, ip->i_size, curthread); 617 return (0); 618 } 619 620 static int 621 cd9660_vget(mp, ino, flags, vpp) 622 struct mount *mp; 623 ino_t ino; 624 int flags; 625 struct vnode **vpp; 626 { 627 628 /* 629 * XXXX 630 * It would be nice if we didn't always set the `relocated' flag 631 * and force the extra read, but I don't want to think about fixing 632 * that right now. 633 */ 634 return (cd9660_vget_internal(mp, ino, flags, vpp, 635 #if 0 636 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 637 #else 638 0, 639 #endif 640 (struct iso_directory_record *)0)); 641 } 642 643 int 644 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir) 645 struct mount *mp; 646 ino_t ino; 647 int flags; 648 struct vnode **vpp; 649 int relocated; 650 struct iso_directory_record *isodir; 651 { 652 struct iso_mnt *imp; 653 struct iso_node *ip; 654 struct buf *bp; 655 struct vnode *vp; 656 struct cdev *dev; 657 int error; 658 struct thread *td; 659 660 td = curthread; 661 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 662 if (error || *vpp != NULL) 663 return (error); 664 665 /* 666 * We must promote to an exclusive lock for vnode creation. This 667 * can happen if lookup is passed LOCKSHARED. 668 */ 669 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 670 flags &= ~LK_TYPE_MASK; 671 flags |= LK_EXCLUSIVE; 672 } 673 674 /* 675 * We do not lock vnode creation as it is believed to be too 676 * expensive for such rare case as simultaneous creation of vnode 677 * for same ino by different processes. We just allow them to race 678 * and check later to decide who wins. Let the race begin! 679 */ 680 681 imp = VFSTOISOFS(mp); 682 dev = imp->im_dev; 683 684 /* Allocate a new vnode/iso_node. */ 685 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) { 686 *vpp = NULLVP; 687 return (error); 688 } 689 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE, 690 M_WAITOK | M_ZERO); 691 vp->v_data = ip; 692 ip->i_vnode = vp; 693 ip->i_number = ino; 694 695 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 696 error = insmntque(vp, mp); 697 if (error != 0) { 698 free(ip, M_ISOFSNODE); 699 *vpp = NULLVP; 700 return (error); 701 } 702 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 703 if (error || *vpp != NULL) 704 return (error); 705 706 if (isodir == NULL) { 707 int lbn, off; 708 709 lbn = lblkno(imp, ino); 710 if (lbn >= imp->volume_space_size) { 711 vput(vp); 712 printf("fhtovp: lbn exceed volume space %d\n", lbn); 713 return (ESTALE); 714 } 715 716 off = blkoff(imp, ino); 717 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 718 vput(vp); 719 printf("fhtovp: crosses block boundary %d\n", 720 off + ISO_DIRECTORY_RECORD_SIZE); 721 return (ESTALE); 722 } 723 724 error = bread(imp->im_devvp, 725 lbn << (imp->im_bshift - DEV_BSHIFT), 726 imp->logical_block_size, NOCRED, &bp); 727 if (error) { 728 vput(vp); 729 brelse(bp); 730 printf("fhtovp: bread error %d\n",error); 731 return (error); 732 } 733 isodir = (struct iso_directory_record *)(bp->b_data + off); 734 735 if (off + isonum_711(isodir->length) > 736 imp->logical_block_size) { 737 vput(vp); 738 brelse(bp); 739 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 740 off +isonum_711(isodir->length), off, 741 isonum_711(isodir->length)); 742 return (ESTALE); 743 } 744 745 #if 0 746 if (isonum_733(isodir->extent) + 747 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 748 brelse(bp); 749 printf("fhtovp: file start miss %d vs %d\n", 750 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 751 ifhp->ifid_start); 752 return (ESTALE); 753 } 754 #endif 755 } else 756 bp = NULL; 757 758 ip->i_mnt = imp; 759 760 if (relocated) { 761 /* 762 * On relocated directories we must 763 * read the `.' entry out of a dir. 764 */ 765 ip->iso_start = ino >> imp->im_bshift; 766 if (bp != NULL) 767 brelse(bp); 768 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 769 vput(vp); 770 return (error); 771 } 772 isodir = (struct iso_directory_record *)bp->b_data; 773 } 774 775 ip->iso_extent = isonum_733(isodir->extent); 776 ip->i_size = isonum_733(isodir->size); 777 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 778 779 /* 780 * Setup time stamp, attribute 781 */ 782 vp->v_type = VNON; 783 switch (imp->iso_ftype) { 784 default: /* ISO_FTYPE_9660 */ 785 { 786 struct buf *bp2; 787 int off; 788 if ((imp->im_flags & ISOFSMNT_EXTATT) 789 && (off = isonum_711(isodir->ext_attr_length))) 790 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 791 &bp2); 792 else 793 bp2 = NULL; 794 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 795 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 796 if (bp2) 797 brelse(bp2); 798 break; 799 } 800 case ISO_FTYPE_RRIP: 801 cd9660_rrip_analyze(isodir, ip, imp); 802 break; 803 } 804 805 brelse(bp); 806 807 /* 808 * Initialize the associated vnode 809 */ 810 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 811 case VFIFO: 812 vp->v_op = &cd9660_fifoops; 813 break; 814 default: 815 VN_LOCK_ASHARE(vp); 816 break; 817 } 818 819 if (ip->iso_extent == imp->root_extent) 820 vp->v_vflag |= VV_ROOT; 821 822 /* 823 * XXX need generation number? 824 */ 825 826 *vpp = vp; 827 return (0); 828 }
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