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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: releng/8.0/sys/fs/cd9660/cd9660_vfsops.c 191990 2009-05-11 15:33:26Z attilio $"); 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, int flags) 99 { 100 struct iso_args args; 101 int error; 102 103 error = copyin(data, &args, sizeof args); 104 if (error) 105 return (error); 106 107 ma = mount_argsu(ma, "from", args.fspec, MAXPATHLEN); 108 ma = mount_arg(ma, "export", &args.export, sizeof args.export); 109 ma = mount_argsu(ma, "cs_disk", args.cs_disk, 64); 110 ma = mount_argsu(ma, "cs_local", args.cs_local, 64); 111 ma = mount_argf(ma, "ssector", "%u", args.ssector); 112 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NORRIP), "norrip"); 113 ma = mount_argb(ma, args.flags & ISOFSMNT_GENS, "nogens"); 114 ma = mount_argb(ma, args.flags & ISOFSMNT_EXTATT, "noextatt"); 115 ma = mount_argb(ma, !(args.flags & ISOFSMNT_NOJOLIET), "nojoliet"); 116 ma = mount_argb(ma, 117 args.flags & ISOFSMNT_BROKENJOLIET, "nobrokenjoliet"); 118 ma = mount_argb(ma, args.flags & ISOFSMNT_KICONV, "nokiconv"); 119 120 error = kernel_mount(ma, flags); 121 122 return (error); 123 } 124 125 static int 126 cd9660_mount(struct mount *mp) 127 { 128 struct vnode *devvp; 129 struct thread *td; 130 char *fspec; 131 int error; 132 accmode_t accmode; 133 struct nameidata ndp; 134 struct iso_mnt *imp = 0; 135 136 td = curthread; 137 138 /* 139 * Unconditionally mount as read-only. 140 */ 141 MNT_ILOCK(mp); 142 mp->mnt_flag |= MNT_RDONLY; 143 MNT_IUNLOCK(mp); 144 145 fspec = vfs_getopts(mp->mnt_optnew, "from", &error); 146 if (error) 147 return (error); 148 149 imp = VFSTOISOFS(mp); 150 151 if (mp->mnt_flag & MNT_UPDATE) { 152 if (vfs_flagopt(mp->mnt_optnew, "export", NULL, 0)) 153 return (0); 154 } 155 /* 156 * Not an update, or updating the name: look up the name 157 * and verify that it refers to a sensible block device. 158 */ 159 NDINIT(&ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 160 if ((error = namei(&ndp))) 161 return (error); 162 NDFREE(&ndp, NDF_ONLY_PNBUF); 163 devvp = ndp.ni_vp; 164 165 if (!vn_isdisk(devvp, &error)) { 166 vput(devvp); 167 return (error); 168 } 169 170 /* 171 * Verify that user has necessary permissions on the device, 172 * or has superuser abilities 173 */ 174 accmode = VREAD; 175 error = VOP_ACCESS(devvp, accmode, td->td_ucred, td); 176 if (error) 177 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 178 if (error) { 179 vput(devvp); 180 return (error); 181 } 182 183 if ((mp->mnt_flag & MNT_UPDATE) == 0) { 184 error = iso_mountfs(devvp, mp); 185 if (error) 186 vrele(devvp); 187 } else { 188 if (devvp != imp->im_devvp) 189 error = EINVAL; /* needs translation */ 190 vput(devvp); 191 } 192 if (error) 193 return (error); 194 vfs_mountedfrom(mp, fspec); 195 return (0); 196 } 197 198 /* 199 * Common code for mount and mountroot 200 */ 201 static int 202 iso_mountfs(devvp, mp) 203 struct vnode *devvp; 204 struct mount *mp; 205 { 206 struct iso_mnt *isomp = (struct iso_mnt *)0; 207 struct buf *bp = NULL; 208 struct buf *pribp = NULL, *supbp = NULL; 209 struct cdev *dev; 210 int error = EINVAL; 211 int high_sierra = 0; 212 int iso_bsize; 213 int iso_blknum; 214 int joliet_level; 215 struct iso_volume_descriptor *vdp = 0; 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 DROP_GIANT(); 228 g_topology_lock(); 229 error = g_vfs_open(devvp, &cp, "cd9660", 0); 230 g_topology_unlock(); 231 PICKUP_GIANT(); 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) { 311 brelse(bp); 312 bp = NULL; 313 } 314 } 315 vd_end: 316 if (bp) { 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; 370 371 mp->mnt_data = isomp; 372 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 373 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 374 mp->mnt_maxsymlinklen = 0; 375 MNT_ILOCK(mp); 376 mp->mnt_flag |= MNT_LOCAL; 377 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 378 MNTK_EXTENDED_SHARED; 379 MNT_IUNLOCK(mp); 380 isomp->im_mountp = mp; 381 isomp->im_dev = dev; 382 isomp->im_devvp = devvp; 383 384 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP); 385 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS); 386 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT); 387 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET); 388 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV); 389 390 /* Check the Rock Ridge Extension support */ 391 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) { 392 if ((error = bread(isomp->im_devvp, 393 (isomp->root_extent + isonum_711(rootp->ext_attr_length)) << 394 (isomp->im_bshift - DEV_BSHIFT), 395 isomp->logical_block_size, NOCRED, &bp)) != 0) 396 goto out; 397 398 rootp = (struct iso_directory_record *)bp->b_data; 399 400 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 401 isomp->im_flags |= ISOFSMNT_NORRIP; 402 } else { 403 isomp->im_flags &= ~ISOFSMNT_GENS; 404 } 405 406 /* 407 * The contents are valid, 408 * but they will get reread as part of another vnode, so... 409 */ 410 bp->b_flags |= B_AGE; 411 brelse(bp); 412 bp = NULL; 413 } 414 415 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 416 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error); 417 if (error) 418 goto out; 419 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error); 420 if (error) 421 goto out; 422 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 423 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 424 } else { 425 isomp->im_d2l = NULL; 426 isomp->im_l2d = NULL; 427 } 428 429 if (high_sierra) { 430 /* this effectively ignores all the mount flags */ 431 if (bootverbose) 432 log(LOG_INFO, "cd9660: High Sierra Format\n"); 433 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 434 } else 435 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 436 default: 437 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 438 break; 439 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 440 isomp->iso_ftype = ISO_FTYPE_9660; 441 break; 442 case 0: 443 if (bootverbose) 444 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 445 isomp->iso_ftype = ISO_FTYPE_RRIP; 446 break; 447 } 448 449 /* Decide whether to use the Joliet descriptor */ 450 451 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 452 if (bootverbose) 453 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", 454 joliet_level); 455 rootp = (struct iso_directory_record *) 456 sup->root_directory_record; 457 bcopy (rootp, isomp->root, sizeof isomp->root); 458 isomp->root_extent = isonum_733 (rootp->extent); 459 isomp->root_size = isonum_733 (rootp->size); 460 isomp->joliet_level = joliet_level; 461 supbp->b_flags |= B_AGE; 462 } 463 464 if (supbp) { 465 brelse(supbp); 466 supbp = NULL; 467 } 468 469 return 0; 470 out: 471 if (bp) 472 brelse(bp); 473 if (pribp) 474 brelse(pribp); 475 if (supbp) 476 brelse(supbp); 477 if (cp != NULL) { 478 DROP_GIANT(); 479 g_topology_lock(); 480 g_vfs_close(cp); 481 g_topology_unlock(); 482 PICKUP_GIANT(); 483 } 484 if (isomp) { 485 free((caddr_t)isomp, M_ISOFSMNT); 486 mp->mnt_data = NULL; 487 } 488 dev_rel(dev); 489 return error; 490 } 491 492 /* 493 * unmount system call 494 */ 495 static int 496 cd9660_unmount(mp, mntflags) 497 struct mount *mp; 498 int mntflags; 499 { 500 struct iso_mnt *isomp; 501 int error, flags = 0; 502 503 if (mntflags & MNT_FORCE) 504 flags |= FORCECLOSE; 505 if ((error = vflush(mp, 0, flags, curthread))) 506 return (error); 507 508 isomp = VFSTOISOFS(mp); 509 510 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 511 if (isomp->im_d2l) 512 cd9660_iconv->close(isomp->im_d2l); 513 if (isomp->im_l2d) 514 cd9660_iconv->close(isomp->im_l2d); 515 } 516 DROP_GIANT(); 517 g_topology_lock(); 518 g_vfs_close(isomp->im_cp); 519 g_topology_unlock(); 520 PICKUP_GIANT(); 521 vrele(isomp->im_devvp); 522 dev_rel(isomp->im_dev); 523 free((caddr_t)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, vpp) 588 struct mount *mp; 589 struct fid *fhp; 590 struct vnode **vpp; 591 { 592 struct ifid *ifhp = (struct ifid *)fhp; 593 struct iso_node *ip; 594 struct vnode *nvp; 595 int error; 596 597 #ifdef ISOFS_DBG 598 printf("fhtovp: ino %d, start %ld\n", 599 ifhp->ifid_ino, ifhp->ifid_start); 600 #endif 601 602 if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 603 *vpp = NULLVP; 604 return (error); 605 } 606 ip = VTOI(nvp); 607 if (ip->inode.iso_mode == 0) { 608 vput(nvp); 609 *vpp = NULLVP; 610 return (ESTALE); 611 } 612 *vpp = nvp; 613 vnode_create_vobject(*vpp, ip->i_size, curthread); 614 return (0); 615 } 616 617 static int 618 cd9660_vget(mp, ino, flags, vpp) 619 struct mount *mp; 620 ino_t ino; 621 int flags; 622 struct vnode **vpp; 623 { 624 625 /* 626 * XXXX 627 * It would be nice if we didn't always set the `relocated' flag 628 * and force the extra read, but I don't want to think about fixing 629 * that right now. 630 */ 631 return (cd9660_vget_internal(mp, ino, flags, vpp, 632 #if 0 633 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 634 #else 635 0, 636 #endif 637 (struct iso_directory_record *)0)); 638 } 639 640 int 641 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir) 642 struct mount *mp; 643 ino_t ino; 644 int flags; 645 struct vnode **vpp; 646 int relocated; 647 struct iso_directory_record *isodir; 648 { 649 struct iso_mnt *imp; 650 struct iso_node *ip; 651 struct buf *bp; 652 struct vnode *vp; 653 struct cdev *dev; 654 int error; 655 struct thread *td; 656 657 td = curthread; 658 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 659 if (error || *vpp != NULL) 660 return (error); 661 662 /* 663 * We must promote to an exclusive lock for vnode creation. This 664 * can happen if lookup is passed LOCKSHARED. 665 */ 666 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 667 flags &= ~LK_TYPE_MASK; 668 flags |= LK_EXCLUSIVE; 669 } 670 671 /* 672 * We do not lock vnode creation as it is believed to be too 673 * expensive for such rare case as simultaneous creation of vnode 674 * for same ino by different processes. We just allow them to race 675 * and check later to decide who wins. Let the race begin! 676 */ 677 678 imp = VFSTOISOFS(mp); 679 dev = imp->im_dev; 680 681 /* Allocate a new vnode/iso_node. */ 682 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) { 683 *vpp = NULLVP; 684 return (error); 685 } 686 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE, 687 M_WAITOK | M_ZERO); 688 vp->v_data = ip; 689 ip->i_vnode = vp; 690 ip->i_number = ino; 691 692 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 693 error = insmntque(vp, mp); 694 if (error != 0) { 695 free(ip, M_ISOFSNODE); 696 *vpp = NULLVP; 697 return (error); 698 } 699 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 700 if (error || *vpp != NULL) 701 return (error); 702 703 if (isodir == 0) { 704 int lbn, off; 705 706 lbn = lblkno(imp, ino); 707 if (lbn >= imp->volume_space_size) { 708 vput(vp); 709 printf("fhtovp: lbn exceed volume space %d\n", lbn); 710 return (ESTALE); 711 } 712 713 off = blkoff(imp, ino); 714 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 715 vput(vp); 716 printf("fhtovp: crosses block boundary %d\n", 717 off + ISO_DIRECTORY_RECORD_SIZE); 718 return (ESTALE); 719 } 720 721 error = bread(imp->im_devvp, 722 lbn << (imp->im_bshift - DEV_BSHIFT), 723 imp->logical_block_size, NOCRED, &bp); 724 if (error) { 725 vput(vp); 726 brelse(bp); 727 printf("fhtovp: bread error %d\n",error); 728 return (error); 729 } 730 isodir = (struct iso_directory_record *)(bp->b_data + off); 731 732 if (off + isonum_711(isodir->length) > 733 imp->logical_block_size) { 734 vput(vp); 735 if (bp != 0) 736 brelse(bp); 737 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 738 off +isonum_711(isodir->length), off, 739 isonum_711(isodir->length)); 740 return (ESTALE); 741 } 742 743 #if 0 744 if (isonum_733(isodir->extent) + 745 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 746 if (bp != 0) 747 brelse(bp); 748 printf("fhtovp: file start miss %d vs %d\n", 749 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 750 ifhp->ifid_start); 751 return (ESTALE); 752 } 753 #endif 754 } else 755 bp = 0; 756 757 ip->i_mnt = imp; 758 759 if (relocated) { 760 /* 761 * On relocated directories we must 762 * read the `.' entry out of a dir. 763 */ 764 ip->iso_start = ino >> imp->im_bshift; 765 if (bp != 0) 766 brelse(bp); 767 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 768 vput(vp); 769 return (error); 770 } 771 isodir = (struct iso_directory_record *)bp->b_data; 772 } 773 774 ip->iso_extent = isonum_733(isodir->extent); 775 ip->i_size = isonum_733(isodir->size); 776 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 777 778 /* 779 * Setup time stamp, attribute 780 */ 781 vp->v_type = VNON; 782 switch (imp->iso_ftype) { 783 default: /* ISO_FTYPE_9660 */ 784 { 785 struct buf *bp2; 786 int off; 787 if ((imp->im_flags & ISOFSMNT_EXTATT) 788 && (off = isonum_711(isodir->ext_attr_length))) 789 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 790 &bp2); 791 else 792 bp2 = NULL; 793 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 794 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 795 if (bp2) 796 brelse(bp2); 797 break; 798 } 799 case ISO_FTYPE_RRIP: 800 cd9660_rrip_analyze(isodir, ip, imp); 801 break; 802 } 803 804 if (bp != 0) 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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