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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 = 0; 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 = (struct iso_mnt *)0; 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 = 0; 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 DROP_GIANT(); 230 g_topology_lock(); 231 error = g_vfs_open(devvp, &cp, "cd9660", 0); 232 g_topology_unlock(); 233 PICKUP_GIANT(); 234 VOP_UNLOCK(devvp, 0); 235 if (error) 236 goto out; 237 if (devvp->v_rdev->si_iosize_max != 0) 238 mp->mnt_iosize_max = devvp->v_rdev->si_iosize_max; 239 if (mp->mnt_iosize_max > MAXPHYS) 240 mp->mnt_iosize_max = MAXPHYS; 241 242 bo = &devvp->v_bufobj; 243 244 /* This is the "logical sector size". The standard says this 245 * should be 2048 or the physical sector size on the device, 246 * whichever is greater. 247 */ 248 if ((ISO_DEFAULT_BLOCK_SIZE % cp->provider->sectorsize) != 0) { 249 error = EINVAL; 250 goto out; 251 } 252 253 iso_bsize = cp->provider->sectorsize; 254 255 joliet_level = 0; 256 if (1 != vfs_scanopt(mp->mnt_optnew, "ssector", "%d", &ssector)) 257 ssector = 0; 258 for (iso_blknum = 16 + ssector; 259 iso_blknum < 100 + ssector; 260 iso_blknum++) { 261 if ((error = bread(devvp, iso_blknum * btodb(ISO_DEFAULT_BLOCK_SIZE), 262 iso_bsize, NOCRED, &bp)) != 0) 263 goto out; 264 265 vdp = (struct iso_volume_descriptor *)bp->b_data; 266 if (bcmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) != 0) { 267 if (bcmp (vdp->id_sierra, ISO_SIERRA_ID, 268 sizeof vdp->id_sierra) != 0) { 269 error = EINVAL; 270 goto out; 271 } else 272 high_sierra = 1; 273 } 274 switch (isonum_711 (high_sierra? vdp->type_sierra: vdp->type)){ 275 case ISO_VD_PRIMARY: 276 if (pribp == NULL) { 277 pribp = bp; 278 bp = NULL; 279 pri = (struct iso_primary_descriptor *)vdp; 280 pri_sierra = 281 (struct iso_sierra_primary_descriptor *)vdp; 282 } 283 break; 284 285 case ISO_VD_SUPPLEMENTARY: 286 if (supbp == NULL) { 287 supbp = bp; 288 bp = NULL; 289 sup = (struct iso_supplementary_descriptor *)vdp; 290 291 if (!vfs_flagopt(mp->mnt_optnew, "nojoliet", NULL, 0)) { 292 if (bcmp(sup->escape, "%/@", 3) == 0) 293 joliet_level = 1; 294 if (bcmp(sup->escape, "%/C", 3) == 0) 295 joliet_level = 2; 296 if (bcmp(sup->escape, "%/E", 3) == 0) 297 joliet_level = 3; 298 299 if ((isonum_711 (sup->flags) & 1) && 300 !vfs_flagopt(mp->mnt_optnew, "brokenjoliet", NULL, 0)) 301 joliet_level = 0; 302 } 303 } 304 break; 305 306 case ISO_VD_END: 307 goto vd_end; 308 309 default: 310 break; 311 } 312 if (bp) { 313 brelse(bp); 314 bp = NULL; 315 } 316 } 317 vd_end: 318 if (bp) { 319 brelse(bp); 320 bp = NULL; 321 } 322 323 if (pri == NULL) { 324 error = EINVAL; 325 goto out; 326 } 327 328 logical_block_size = 329 isonum_723 (high_sierra? 330 pri_sierra->logical_block_size: 331 pri->logical_block_size); 332 333 if (logical_block_size < DEV_BSIZE || logical_block_size > MAXBSIZE 334 || (logical_block_size & (logical_block_size - 1)) != 0) { 335 error = EINVAL; 336 goto out; 337 } 338 339 rootp = (struct iso_directory_record *) 340 (high_sierra? 341 pri_sierra->root_directory_record: 342 pri->root_directory_record); 343 344 isomp = malloc(sizeof *isomp, M_ISOFSMNT, M_WAITOK | M_ZERO); 345 isomp->im_cp = cp; 346 isomp->im_bo = bo; 347 isomp->logical_block_size = logical_block_size; 348 isomp->volume_space_size = 349 isonum_733 (high_sierra? 350 pri_sierra->volume_space_size: 351 pri->volume_space_size); 352 isomp->joliet_level = 0; 353 /* 354 * Since an ISO9660 multi-session CD can also access previous 355 * sessions, we have to include them into the space consider- 356 * ations. This doesn't yield a very accurate number since 357 * parts of the old sessions might be inaccessible now, but we 358 * can't do much better. This is also important for the NFS 359 * filehandle validation. 360 */ 361 isomp->volume_space_size += ssector; 362 bcopy (rootp, isomp->root, sizeof isomp->root); 363 isomp->root_extent = isonum_733 (rootp->extent); 364 isomp->root_size = isonum_733 (rootp->size); 365 366 isomp->im_bmask = logical_block_size - 1; 367 isomp->im_bshift = ffs(logical_block_size) - 1; 368 369 pribp->b_flags |= B_AGE; 370 brelse(pribp); 371 pribp = NULL; 372 rootp = NULL; 373 pri = NULL; 374 pri_sierra = NULL; 375 376 mp->mnt_data = isomp; 377 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 378 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 379 mp->mnt_maxsymlinklen = 0; 380 MNT_ILOCK(mp); 381 mp->mnt_flag |= MNT_LOCAL; 382 mp->mnt_kern_flag |= MNTK_MPSAFE | MNTK_LOOKUP_SHARED | 383 MNTK_EXTENDED_SHARED; 384 MNT_IUNLOCK(mp); 385 isomp->im_mountp = mp; 386 isomp->im_dev = dev; 387 isomp->im_devvp = devvp; 388 389 vfs_flagopt(mp->mnt_optnew, "norrip", &isomp->im_flags, ISOFSMNT_NORRIP); 390 vfs_flagopt(mp->mnt_optnew, "gens", &isomp->im_flags, ISOFSMNT_GENS); 391 vfs_flagopt(mp->mnt_optnew, "extatt", &isomp->im_flags, ISOFSMNT_EXTATT); 392 vfs_flagopt(mp->mnt_optnew, "nojoliet", &isomp->im_flags, ISOFSMNT_NOJOLIET); 393 vfs_flagopt(mp->mnt_optnew, "kiconv", &isomp->im_flags, ISOFSMNT_KICONV); 394 395 /* Check the Rock Ridge Extension support */ 396 if (!(isomp->im_flags & ISOFSMNT_NORRIP)) { 397 if ((error = bread(isomp->im_devvp, (isomp->root_extent + 398 isonum_711(((struct iso_directory_record *)isomp->root)-> 399 ext_attr_length)) << (isomp->im_bshift - DEV_BSHIFT), 400 isomp->logical_block_size, NOCRED, &bp)) != 0) 401 goto out; 402 403 rootp = (struct iso_directory_record *)bp->b_data; 404 405 if ((isomp->rr_skip = cd9660_rrip_offset(rootp,isomp)) < 0) { 406 isomp->im_flags |= ISOFSMNT_NORRIP; 407 } else { 408 isomp->im_flags &= ~ISOFSMNT_GENS; 409 } 410 411 /* 412 * The contents are valid, 413 * but they will get reread as part of another vnode, so... 414 */ 415 bp->b_flags |= B_AGE; 416 brelse(bp); 417 bp = NULL; 418 rootp = NULL; 419 } 420 421 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 422 cs_local = vfs_getopts(mp->mnt_optnew, "cs_local", &error); 423 if (error) 424 goto out; 425 cs_disk = vfs_getopts(mp->mnt_optnew, "cs_disk", &error); 426 if (error) 427 goto out; 428 cd9660_iconv->open(cs_local, cs_disk, &isomp->im_d2l); 429 cd9660_iconv->open(cs_disk, cs_local, &isomp->im_l2d); 430 } else { 431 isomp->im_d2l = NULL; 432 isomp->im_l2d = NULL; 433 } 434 435 if (high_sierra) { 436 /* this effectively ignores all the mount flags */ 437 if (bootverbose) 438 log(LOG_INFO, "cd9660: High Sierra Format\n"); 439 isomp->iso_ftype = ISO_FTYPE_HIGH_SIERRA; 440 } else 441 switch (isomp->im_flags&(ISOFSMNT_NORRIP|ISOFSMNT_GENS)) { 442 default: 443 isomp->iso_ftype = ISO_FTYPE_DEFAULT; 444 break; 445 case ISOFSMNT_GENS|ISOFSMNT_NORRIP: 446 isomp->iso_ftype = ISO_FTYPE_9660; 447 break; 448 case 0: 449 if (bootverbose) 450 log(LOG_INFO, "cd9660: RockRidge Extension\n"); 451 isomp->iso_ftype = ISO_FTYPE_RRIP; 452 break; 453 } 454 455 /* Decide whether to use the Joliet descriptor */ 456 457 if (isomp->iso_ftype != ISO_FTYPE_RRIP && joliet_level) { 458 if (bootverbose) 459 log(LOG_INFO, "cd9660: Joliet Extension (Level %d)\n", 460 joliet_level); 461 rootp = (struct iso_directory_record *) 462 sup->root_directory_record; 463 bcopy (rootp, isomp->root, sizeof isomp->root); 464 isomp->root_extent = isonum_733 (rootp->extent); 465 isomp->root_size = isonum_733 (rootp->size); 466 isomp->joliet_level = joliet_level; 467 supbp->b_flags |= B_AGE; 468 } 469 470 if (supbp) { 471 brelse(supbp); 472 supbp = NULL; 473 sup = NULL; 474 } 475 476 return 0; 477 out: 478 if (bp) 479 brelse(bp); 480 if (pribp) 481 brelse(pribp); 482 if (supbp) 483 brelse(supbp); 484 if (cp != NULL) { 485 DROP_GIANT(); 486 g_topology_lock(); 487 g_vfs_close(cp); 488 g_topology_unlock(); 489 PICKUP_GIANT(); 490 } 491 if (isomp) { 492 free((caddr_t)isomp, M_ISOFSMNT); 493 mp->mnt_data = NULL; 494 } 495 dev_rel(dev); 496 return error; 497 } 498 499 /* 500 * unmount system call 501 */ 502 static int 503 cd9660_unmount(mp, mntflags) 504 struct mount *mp; 505 int mntflags; 506 { 507 struct iso_mnt *isomp; 508 int error, flags = 0; 509 510 if (mntflags & MNT_FORCE) 511 flags |= FORCECLOSE; 512 if ((error = vflush(mp, 0, flags, curthread))) 513 return (error); 514 515 isomp = VFSTOISOFS(mp); 516 517 if (isomp->im_flags & ISOFSMNT_KICONV && cd9660_iconv) { 518 if (isomp->im_d2l) 519 cd9660_iconv->close(isomp->im_d2l); 520 if (isomp->im_l2d) 521 cd9660_iconv->close(isomp->im_l2d); 522 } 523 DROP_GIANT(); 524 g_topology_lock(); 525 g_vfs_close(isomp->im_cp); 526 g_topology_unlock(); 527 PICKUP_GIANT(); 528 vrele(isomp->im_devvp); 529 dev_rel(isomp->im_dev); 530 free((caddr_t)isomp, M_ISOFSMNT); 531 mp->mnt_data = NULL; 532 MNT_ILOCK(mp); 533 mp->mnt_flag &= ~MNT_LOCAL; 534 MNT_IUNLOCK(mp); 535 return (error); 536 } 537 538 /* 539 * Return root of a filesystem 540 */ 541 static int 542 cd9660_root(mp, flags, vpp) 543 struct mount *mp; 544 int flags; 545 struct vnode **vpp; 546 { 547 struct iso_mnt *imp = VFSTOISOFS(mp); 548 struct iso_directory_record *dp = 549 (struct iso_directory_record *)imp->root; 550 ino_t ino = isodirino(dp, imp); 551 552 /* 553 * With RRIP we must use the `.' entry of the root directory. 554 * Simply tell vget, that it's a relocated directory. 555 */ 556 return (cd9660_vget_internal(mp, ino, flags, vpp, 557 imp->iso_ftype == ISO_FTYPE_RRIP, dp)); 558 } 559 560 /* 561 * Get filesystem statistics. 562 */ 563 static int 564 cd9660_statfs(mp, sbp) 565 struct mount *mp; 566 struct statfs *sbp; 567 { 568 struct iso_mnt *isomp; 569 570 isomp = VFSTOISOFS(mp); 571 572 sbp->f_bsize = isomp->logical_block_size; 573 sbp->f_iosize = sbp->f_bsize; /* XXX */ 574 sbp->f_blocks = isomp->volume_space_size; 575 sbp->f_bfree = 0; /* total free blocks */ 576 sbp->f_bavail = 0; /* blocks free for non superuser */ 577 sbp->f_files = 0; /* total files */ 578 sbp->f_ffree = 0; /* free file nodes */ 579 return 0; 580 } 581 582 /* 583 * File handle to vnode 584 * 585 * Have to be really careful about stale file handles: 586 * - check that the inode number is in range 587 * - call iget() to get the locked inode 588 * - check for an unallocated inode (i_mode == 0) 589 * - check that the generation number matches 590 */ 591 592 /* ARGSUSED */ 593 static int 594 cd9660_fhtovp(mp, fhp, flags, vpp) 595 struct mount *mp; 596 struct fid *fhp; 597 int flags; 598 struct vnode **vpp; 599 { 600 struct ifid ifh; 601 struct iso_node *ip; 602 struct vnode *nvp; 603 int error; 604 605 memcpy(&ifh, fhp, sizeof(ifh)); 606 607 #ifdef ISOFS_DBG 608 printf("fhtovp: ino %d, start %ld\n", 609 ifh.ifid_ino, ifh.ifid_start); 610 #endif 611 612 if ((error = VFS_VGET(mp, ifh.ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 613 *vpp = NULLVP; 614 return (error); 615 } 616 ip = VTOI(nvp); 617 if (ip->inode.iso_mode == 0) { 618 vput(nvp); 619 *vpp = NULLVP; 620 return (ESTALE); 621 } 622 *vpp = nvp; 623 vnode_create_vobject(*vpp, ip->i_size, curthread); 624 return (0); 625 } 626 627 static int 628 cd9660_vget(mp, ino, flags, vpp) 629 struct mount *mp; 630 ino_t ino; 631 int flags; 632 struct vnode **vpp; 633 { 634 635 /* 636 * XXXX 637 * It would be nice if we didn't always set the `relocated' flag 638 * and force the extra read, but I don't want to think about fixing 639 * that right now. 640 */ 641 return (cd9660_vget_internal(mp, ino, flags, vpp, 642 #if 0 643 VFSTOISOFS(mp)->iso_ftype == ISO_FTYPE_RRIP, 644 #else 645 0, 646 #endif 647 (struct iso_directory_record *)0)); 648 } 649 650 int 651 cd9660_vget_internal(mp, ino, flags, vpp, relocated, isodir) 652 struct mount *mp; 653 ino_t ino; 654 int flags; 655 struct vnode **vpp; 656 int relocated; 657 struct iso_directory_record *isodir; 658 { 659 struct iso_mnt *imp; 660 struct iso_node *ip; 661 struct buf *bp; 662 struct vnode *vp; 663 struct cdev *dev; 664 int error; 665 struct thread *td; 666 667 td = curthread; 668 error = vfs_hash_get(mp, ino, flags, td, vpp, NULL, NULL); 669 if (error || *vpp != NULL) 670 return (error); 671 672 /* 673 * We must promote to an exclusive lock for vnode creation. This 674 * can happen if lookup is passed LOCKSHARED. 675 */ 676 if ((flags & LK_TYPE_MASK) == LK_SHARED) { 677 flags &= ~LK_TYPE_MASK; 678 flags |= LK_EXCLUSIVE; 679 } 680 681 /* 682 * We do not lock vnode creation as it is believed to be too 683 * expensive for such rare case as simultaneous creation of vnode 684 * for same ino by different processes. We just allow them to race 685 * and check later to decide who wins. Let the race begin! 686 */ 687 688 imp = VFSTOISOFS(mp); 689 dev = imp->im_dev; 690 691 /* Allocate a new vnode/iso_node. */ 692 if ((error = getnewvnode("isofs", mp, &cd9660_vnodeops, &vp)) != 0) { 693 *vpp = NULLVP; 694 return (error); 695 } 696 ip = malloc(sizeof(struct iso_node), M_ISOFSNODE, 697 M_WAITOK | M_ZERO); 698 vp->v_data = ip; 699 ip->i_vnode = vp; 700 ip->i_number = ino; 701 702 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL); 703 error = insmntque(vp, mp); 704 if (error != 0) { 705 free(ip, M_ISOFSNODE); 706 *vpp = NULLVP; 707 return (error); 708 } 709 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 710 if (error || *vpp != NULL) 711 return (error); 712 713 if (isodir == 0) { 714 int lbn, off; 715 716 lbn = lblkno(imp, ino); 717 if (lbn >= imp->volume_space_size) { 718 vput(vp); 719 printf("fhtovp: lbn exceed volume space %d\n", lbn); 720 return (ESTALE); 721 } 722 723 off = blkoff(imp, ino); 724 if (off + ISO_DIRECTORY_RECORD_SIZE > imp->logical_block_size) { 725 vput(vp); 726 printf("fhtovp: crosses block boundary %d\n", 727 off + ISO_DIRECTORY_RECORD_SIZE); 728 return (ESTALE); 729 } 730 731 error = bread(imp->im_devvp, 732 lbn << (imp->im_bshift - DEV_BSHIFT), 733 imp->logical_block_size, NOCRED, &bp); 734 if (error) { 735 vput(vp); 736 brelse(bp); 737 printf("fhtovp: bread error %d\n",error); 738 return (error); 739 } 740 isodir = (struct iso_directory_record *)(bp->b_data + off); 741 742 if (off + isonum_711(isodir->length) > 743 imp->logical_block_size) { 744 vput(vp); 745 if (bp != 0) 746 brelse(bp); 747 printf("fhtovp: directory crosses block boundary %d[off=%d/len=%d]\n", 748 off +isonum_711(isodir->length), off, 749 isonum_711(isodir->length)); 750 return (ESTALE); 751 } 752 753 #if 0 754 if (isonum_733(isodir->extent) + 755 isonum_711(isodir->ext_attr_length) != ifhp->ifid_start) { 756 if (bp != 0) 757 brelse(bp); 758 printf("fhtovp: file start miss %d vs %d\n", 759 isonum_733(isodir->extent) + isonum_711(isodir->ext_attr_length), 760 ifhp->ifid_start); 761 return (ESTALE); 762 } 763 #endif 764 } else 765 bp = 0; 766 767 ip->i_mnt = imp; 768 769 if (relocated) { 770 /* 771 * On relocated directories we must 772 * read the `.' entry out of a dir. 773 */ 774 ip->iso_start = ino >> imp->im_bshift; 775 if (bp != 0) 776 brelse(bp); 777 if ((error = cd9660_blkatoff(vp, (off_t)0, NULL, &bp)) != 0) { 778 vput(vp); 779 return (error); 780 } 781 isodir = (struct iso_directory_record *)bp->b_data; 782 } 783 784 ip->iso_extent = isonum_733(isodir->extent); 785 ip->i_size = isonum_733(isodir->size); 786 ip->iso_start = isonum_711(isodir->ext_attr_length) + ip->iso_extent; 787 788 /* 789 * Setup time stamp, attribute 790 */ 791 vp->v_type = VNON; 792 switch (imp->iso_ftype) { 793 default: /* ISO_FTYPE_9660 */ 794 { 795 struct buf *bp2; 796 int off; 797 if ((imp->im_flags & ISOFSMNT_EXTATT) 798 && (off = isonum_711(isodir->ext_attr_length))) 799 cd9660_blkatoff(vp, (off_t)-(off << imp->im_bshift), NULL, 800 &bp2); 801 else 802 bp2 = NULL; 803 cd9660_defattr(isodir, ip, bp2, ISO_FTYPE_9660); 804 cd9660_deftstamp(isodir, ip, bp2, ISO_FTYPE_9660); 805 if (bp2) 806 brelse(bp2); 807 break; 808 } 809 case ISO_FTYPE_RRIP: 810 cd9660_rrip_analyze(isodir, ip, imp); 811 break; 812 } 813 814 if (bp != 0) 815 brelse(bp); 816 817 /* 818 * Initialize the associated vnode 819 */ 820 switch (vp->v_type = IFTOVT(ip->inode.iso_mode)) { 821 case VFIFO: 822 vp->v_op = &cd9660_fifoops; 823 break; 824 default: 825 VN_LOCK_ASHARE(vp); 826 break; 827 } 828 829 if (ip->iso_extent == imp->root_extent) 830 vp->v_vflag |= VV_ROOT; 831 832 /* 833 * XXX need generation number? 834 */ 835 836 *vpp = vp; 837 return (0); 838 }
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