Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/fs/udf/udf_vfsops.c
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1 /*- 2 * Copyright (c) 2001, 2002 Scott Long <scottl@freebsd.org> 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24 * SUCH DAMAGE. 25 * 26 * $FreeBSD$ 27 */ 28 29 /* udf_vfsops.c */ 30 /* Implement the VFS side of things */ 31 32 /* 33 * Ok, here's how it goes. The UDF specs are pretty clear on how each data 34 * structure is made up, but not very clear on how they relate to each other. 35 * Here is the skinny... This demostrates a filesystem with one file in the 36 * root directory. Subdirectories are treated just as normal files, but they 37 * have File Id Descriptors of their children as their file data. As for the 38 * Anchor Volume Descriptor Pointer, it can exist in two of the following three 39 * places: sector 256, sector n (the max sector of the disk), or sector 40 * n - 256. It's a pretty good bet that one will exist at sector 256 though. 41 * One caveat is unclosed CD media. For that, sector 256 cannot be written, 42 * so the Anchor Volume Descriptor Pointer can exist at sector 512 until the 43 * media is closed. 44 * 45 * Sector: 46 * 256: 47 * n: Anchor Volume Descriptor Pointer 48 * n - 256: | 49 * | 50 * |-->Main Volume Descriptor Sequence 51 * | | 52 * | | 53 * | |-->Logical Volume Descriptor 54 * | | 55 * |-->Partition Descriptor | 56 * | | 57 * | | 58 * |-->Fileset Descriptor 59 * | 60 * | 61 * |-->Root Dir File Entry 62 * | 63 * | 64 * |-->File data: 65 * File Id Descriptor 66 * | 67 * | 68 * |-->File Entry 69 * | 70 * | 71 * |-->File data 72 */ 73 #include <sys/types.h> 74 #include <sys/param.h> 75 #include <sys/systm.h> 76 #include <sys/uio.h> 77 #include <sys/bio.h> 78 #include <sys/buf.h> 79 #include <sys/conf.h> 80 #include <sys/dirent.h> 81 #include <sys/fcntl.h> 82 #include <sys/iconv.h> 83 #include <sys/kernel.h> 84 #include <sys/malloc.h> 85 #include <sys/mount.h> 86 #include <sys/namei.h> 87 #include <sys/priv.h> 88 #include <sys/proc.h> 89 #include <sys/queue.h> 90 #include <sys/vnode.h> 91 #include <sys/endian.h> 92 93 #include <geom/geom.h> 94 #include <geom/geom_vfs.h> 95 96 #include <vm/uma.h> 97 98 #include <fs/udf/ecma167-udf.h> 99 #include <fs/udf/osta.h> 100 #include <fs/udf/udf.h> 101 #include <fs/udf/udf_mount.h> 102 103 static MALLOC_DEFINE(M_UDFMOUNT, "udf_mount", "UDF mount structure"); 104 MALLOC_DEFINE(M_UDFFENTRY, "udf_fentry", "UDF file entry structure"); 105 106 struct iconv_functions *udf_iconv = NULL; 107 108 /* Zones */ 109 uma_zone_t udf_zone_trans = NULL; 110 uma_zone_t udf_zone_node = NULL; 111 uma_zone_t udf_zone_ds = NULL; 112 113 static vfs_init_t udf_init; 114 static vfs_uninit_t udf_uninit; 115 static vfs_mount_t udf_mount; 116 static vfs_root_t udf_root; 117 static vfs_statfs_t udf_statfs; 118 static vfs_unmount_t udf_unmount; 119 static vfs_fhtovp_t udf_fhtovp; 120 121 static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *); 122 123 static struct vfsops udf_vfsops = { 124 .vfs_fhtovp = udf_fhtovp, 125 .vfs_init = udf_init, 126 .vfs_mount = udf_mount, 127 .vfs_root = udf_root, 128 .vfs_statfs = udf_statfs, 129 .vfs_uninit = udf_uninit, 130 .vfs_unmount = udf_unmount, 131 .vfs_vget = udf_vget, 132 }; 133 VFS_SET(udf_vfsops, udf, VFCF_READONLY); 134 135 MODULE_VERSION(udf, 1); 136 137 static int udf_mountfs(struct vnode *, struct mount *, struct thread *); 138 139 static int 140 udf_init(struct vfsconf *foo) 141 { 142 143 /* 144 * This code used to pre-allocate a certain number of pages for each 145 * pool, reducing the need to grow the zones later on. UMA doesn't 146 * advertise any such functionality, unfortunately =-< 147 */ 148 udf_zone_trans = uma_zcreate("UDF translation buffer, zone", MAXNAMLEN * 149 sizeof(unicode_t), NULL, NULL, NULL, NULL, 0, 0); 150 151 udf_zone_node = uma_zcreate("UDF Node zone", sizeof(struct udf_node), 152 NULL, NULL, NULL, NULL, 0, 0); 153 154 udf_zone_ds = uma_zcreate("UDF Dirstream zone", 155 sizeof(struct udf_dirstream), NULL, NULL, NULL, NULL, 0, 0); 156 157 if ((udf_zone_node == NULL) || (udf_zone_trans == NULL) || 158 (udf_zone_ds == NULL)) { 159 printf("Cannot create allocation zones.\n"); 160 return (ENOMEM); 161 } 162 163 return 0; 164 } 165 166 static int 167 udf_uninit(struct vfsconf *foo) 168 { 169 170 if (udf_zone_trans != NULL) { 171 uma_zdestroy(udf_zone_trans); 172 udf_zone_trans = NULL; 173 } 174 175 if (udf_zone_node != NULL) { 176 uma_zdestroy(udf_zone_node); 177 udf_zone_node = NULL; 178 } 179 180 if (udf_zone_ds != NULL) { 181 uma_zdestroy(udf_zone_ds); 182 udf_zone_ds = NULL; 183 } 184 185 return (0); 186 } 187 188 static int 189 udf_mount(struct mount *mp, struct thread *td) 190 { 191 struct vnode *devvp; /* vnode of the mount device */ 192 struct udf_mnt *imp = 0; 193 struct vfsoptlist *opts; 194 char *fspec, *cs_disk, *cs_local; 195 int error, len, *udf_flags; 196 struct nameidata nd, *ndp = &nd; 197 198 opts = mp->mnt_optnew; 199 200 /* 201 * Unconditionally mount as read-only. 202 */ 203 MNT_ILOCK(mp); 204 mp->mnt_flag |= MNT_RDONLY; 205 MNT_IUNLOCK(mp); 206 207 /* 208 * No root filesystem support. Probably not a big deal, since the 209 * bootloader doesn't understand UDF. 210 */ 211 if (mp->mnt_flag & MNT_ROOTFS) 212 return (ENOTSUP); 213 214 fspec = NULL; 215 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 216 if (!error && fspec[len - 1] != '\0') 217 return (EINVAL); 218 219 if (mp->mnt_flag & MNT_UPDATE) { 220 return (0); 221 } 222 223 /* Check that the mount device exists */ 224 if (fspec == NULL) 225 return (EINVAL); 226 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 227 if ((error = namei(ndp))) 228 return (error); 229 NDFREE(ndp, NDF_ONLY_PNBUF); 230 devvp = ndp->ni_vp; 231 232 if (vn_isdisk(devvp, &error) == 0) { 233 vput(devvp); 234 return (error); 235 } 236 237 /* Check the access rights on the mount device */ 238 error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td); 239 if (error) 240 error = priv_check(td, PRIV_VFS_MOUNT_PERM); 241 if (error) { 242 vput(devvp); 243 return (error); 244 } 245 246 if ((error = udf_mountfs(devvp, mp, td))) { 247 vrele(devvp); 248 return (error); 249 } 250 251 imp = VFSTOUDFFS(mp); 252 253 udf_flags = NULL; 254 error = vfs_getopt(opts, "flags", (void **)&udf_flags, &len); 255 if (error || len != sizeof(int)) 256 return (EINVAL); 257 imp->im_flags = *udf_flags; 258 259 if (imp->im_flags & UDFMNT_KICONV && udf_iconv) { 260 cs_disk = NULL; 261 error = vfs_getopt(opts, "cs_disk", (void **)&cs_disk, &len); 262 if (!error && cs_disk[len - 1] != '\0') 263 return (EINVAL); 264 cs_local = NULL; 265 error = vfs_getopt(opts, "cs_local", (void **)&cs_local, &len); 266 if (!error && cs_local[len - 1] != '\0') 267 return (EINVAL); 268 udf_iconv->open(cs_local, cs_disk, &imp->im_d2l); 269 #if 0 270 udf_iconv->open(cs_disk, cs_local, &imp->im_l2d); 271 #endif 272 } 273 274 vfs_mountedfrom(mp, fspec); 275 return 0; 276 }; 277 278 /* 279 * Check the descriptor tag for both the correct id and correct checksum. 280 * Return zero if all is good, EINVAL if not. 281 */ 282 int 283 udf_checktag(struct desc_tag *tag, uint16_t id) 284 { 285 uint8_t *itag; 286 uint8_t i, cksum = 0; 287 288 itag = (uint8_t *)tag; 289 290 if (le16toh(tag->id) != id) 291 return (EINVAL); 292 293 for (i = 0; i < 15; i++) 294 cksum = cksum + itag[i]; 295 cksum = cksum - itag[4]; 296 297 if (cksum == tag->cksum) 298 return (0); 299 300 return (EINVAL); 301 } 302 303 static int 304 udf_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td) { 305 struct buf *bp = NULL; 306 struct anchor_vdp avdp; 307 struct udf_mnt *udfmp = NULL; 308 struct part_desc *pd; 309 struct logvol_desc *lvd; 310 struct fileset_desc *fsd; 311 struct file_entry *root_fentry; 312 uint32_t sector, size, mvds_start, mvds_end; 313 uint32_t logical_secsize; 314 uint32_t fsd_offset = 0; 315 uint16_t part_num = 0, fsd_part = 0; 316 int error = EINVAL; 317 int logvol_found = 0, part_found = 0, fsd_found = 0; 318 int bsize; 319 struct g_consumer *cp; 320 struct bufobj *bo; 321 322 DROP_GIANT(); 323 g_topology_lock(); 324 error = g_vfs_open(devvp, &cp, "udf", 0); 325 g_topology_unlock(); 326 PICKUP_GIANT(); 327 VOP_UNLOCK(devvp, 0, td); 328 if (error) 329 return error; 330 331 bo = &devvp->v_bufobj; 332 333 /* XXX: should be M_WAITOK */ 334 MALLOC(udfmp, struct udf_mnt *, sizeof(struct udf_mnt), M_UDFMOUNT, 335 M_NOWAIT | M_ZERO); 336 if (udfmp == NULL) { 337 printf("Cannot allocate UDF mount struct\n"); 338 error = ENOMEM; 339 goto bail; 340 } 341 342 mp->mnt_data = (qaddr_t)udfmp; 343 mp->mnt_stat.f_fsid.val[0] = dev2udev(devvp->v_rdev); 344 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 345 MNT_ILOCK(mp); 346 mp->mnt_flag |= MNT_LOCAL; 347 MNT_IUNLOCK(mp); 348 udfmp->im_mountp = mp; 349 udfmp->im_dev = devvp->v_rdev; 350 udfmp->im_devvp = devvp; 351 udfmp->im_d2l = NULL; 352 udfmp->im_cp = cp; 353 udfmp->im_bo = bo; 354 355 #if 0 356 udfmp->im_l2d = NULL; 357 #endif 358 /* 359 * The UDF specification defines a logical sectorsize of 2048 360 * for DVD media. 361 */ 362 logical_secsize = 2048; 363 364 if (((logical_secsize % cp->provider->sectorsize) != 0) || 365 (logical_secsize < cp->provider->sectorsize)) { 366 DROP_GIANT(); 367 g_topology_lock(); 368 g_vfs_close(cp, td); 369 g_topology_unlock(); 370 PICKUP_GIANT(); 371 return (EINVAL); 372 } 373 374 bsize = cp->provider->sectorsize; 375 376 /* 377 * Get the Anchor Volume Descriptor Pointer from sector 256. 378 * XXX Should also check sector n - 256, n, and 512. 379 */ 380 sector = 256; 381 if ((error = bread(devvp, sector * btodb(logical_secsize), bsize, 382 NOCRED, &bp)) != 0) 383 goto bail; 384 if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR))) 385 goto bail; 386 387 bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp)); 388 brelse(bp); 389 bp = NULL; 390 391 /* 392 * Extract the Partition Descriptor and Logical Volume Descriptor 393 * from the Volume Descriptor Sequence. 394 * XXX Should we care about the partition type right now? 395 * XXX What about multiple partitions? 396 */ 397 mvds_start = le32toh(avdp.main_vds_ex.loc); 398 mvds_end = mvds_start + (le32toh(avdp.main_vds_ex.len) - 1) / bsize; 399 for (sector = mvds_start; sector < mvds_end; sector++) { 400 if ((error = bread(devvp, sector * btodb(logical_secsize), 401 bsize, NOCRED, &bp)) != 0) { 402 printf("Can't read sector %d of VDS\n", sector); 403 goto bail; 404 } 405 lvd = (struct logvol_desc *)bp->b_data; 406 if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) { 407 udfmp->bsize = le32toh(lvd->lb_size); 408 udfmp->bmask = udfmp->bsize - 1; 409 udfmp->bshift = ffs(udfmp->bsize) - 1; 410 fsd_part = le16toh(lvd->_lvd_use.fsd_loc.loc.part_num); 411 fsd_offset = le32toh(lvd->_lvd_use.fsd_loc.loc.lb_num); 412 if (udf_find_partmaps(udfmp, lvd)) 413 break; 414 logvol_found = 1; 415 } 416 pd = (struct part_desc *)bp->b_data; 417 if (!udf_checktag(&pd->tag, TAGID_PARTITION)) { 418 part_found = 1; 419 part_num = le16toh(pd->part_num); 420 udfmp->part_len = le32toh(pd->part_len); 421 udfmp->part_start = le32toh(pd->start_loc); 422 } 423 424 brelse(bp); 425 bp = NULL; 426 if ((part_found) && (logvol_found)) 427 break; 428 } 429 430 if (!part_found || !logvol_found) { 431 error = EINVAL; 432 goto bail; 433 } 434 435 if (fsd_part != part_num) { 436 printf("FSD does not lie within the partition!\n"); 437 error = EINVAL; 438 goto bail; 439 } 440 441 442 /* 443 * Grab the Fileset Descriptor 444 * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing 445 * me in the right direction here. 446 */ 447 sector = udfmp->part_start + fsd_offset; 448 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 449 printf("Cannot read sector %d of FSD\n", sector); 450 goto bail; 451 } 452 fsd = (struct fileset_desc *)bp->b_data; 453 if (!udf_checktag(&fsd->tag, TAGID_FSD)) { 454 fsd_found = 1; 455 bcopy(&fsd->rootdir_icb, &udfmp->root_icb, 456 sizeof(struct long_ad)); 457 } 458 459 brelse(bp); 460 bp = NULL; 461 462 if (!fsd_found) { 463 printf("Couldn't find the fsd\n"); 464 error = EINVAL; 465 goto bail; 466 } 467 468 /* 469 * Find the file entry for the root directory. 470 */ 471 sector = le32toh(udfmp->root_icb.loc.lb_num) + udfmp->part_start; 472 size = le32toh(udfmp->root_icb.len); 473 if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) { 474 printf("Cannot read sector %d\n", sector); 475 goto bail; 476 } 477 478 root_fentry = (struct file_entry *)bp->b_data; 479 if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) { 480 printf("Invalid root file entry!\n"); 481 goto bail; 482 } 483 484 brelse(bp); 485 bp = NULL; 486 487 return 0; 488 489 bail: 490 if (udfmp != NULL) 491 FREE(udfmp, M_UDFMOUNT); 492 if (bp != NULL) 493 brelse(bp); 494 DROP_GIANT(); 495 g_topology_lock(); 496 g_vfs_close(cp, td); 497 g_topology_unlock(); 498 PICKUP_GIANT(); 499 return error; 500 }; 501 502 static int 503 udf_unmount(struct mount *mp, int mntflags, struct thread *td) 504 { 505 struct udf_mnt *udfmp; 506 int error, flags = 0; 507 508 udfmp = VFSTOUDFFS(mp); 509 510 if (mntflags & MNT_FORCE) 511 flags |= FORCECLOSE; 512 513 if ((error = vflush(mp, 0, flags, td))) 514 return (error); 515 516 if (udfmp->im_flags & UDFMNT_KICONV && udf_iconv) { 517 if (udfmp->im_d2l) 518 udf_iconv->close(udfmp->im_d2l); 519 #if 0 520 if (udfmp->im_l2d) 521 udf_iconv->close(udfmp->im_l2d); 522 #endif 523 } 524 525 DROP_GIANT(); 526 g_topology_lock(); 527 g_vfs_close(udfmp->im_cp, td); 528 g_topology_unlock(); 529 PICKUP_GIANT(); 530 vrele(udfmp->im_devvp); 531 532 if (udfmp->s_table != NULL) 533 FREE(udfmp->s_table, M_UDFMOUNT); 534 535 FREE(udfmp, M_UDFMOUNT); 536 537 mp->mnt_data = (qaddr_t)0; 538 MNT_ILOCK(mp); 539 mp->mnt_flag &= ~MNT_LOCAL; 540 MNT_IUNLOCK(mp); 541 542 return (0); 543 } 544 545 static int 546 udf_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td) 547 { 548 struct udf_mnt *udfmp; 549 struct vnode *vp; 550 ino_t id; 551 int error; 552 553 udfmp = VFSTOUDFFS(mp); 554 555 id = udf_getid(&udfmp->root_icb); 556 557 error = udf_vget(mp, id, LK_EXCLUSIVE, vpp); 558 if (error) 559 return error; 560 561 vp = *vpp; 562 vp->v_vflag |= VV_ROOT; 563 564 return (0); 565 } 566 567 static int 568 udf_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 569 { 570 struct udf_mnt *udfmp; 571 572 udfmp = VFSTOUDFFS(mp); 573 574 sbp->f_bsize = udfmp->bsize; 575 sbp->f_iosize = udfmp->bsize; 576 sbp->f_blocks = udfmp->part_len; 577 sbp->f_bfree = 0; 578 sbp->f_bavail = 0; 579 sbp->f_files = 0; 580 sbp->f_ffree = 0; 581 return 0; 582 } 583 584 int 585 udf_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 586 { 587 struct buf *bp; 588 struct vnode *devvp; 589 struct udf_mnt *udfmp; 590 struct thread *td; 591 struct vnode *vp; 592 struct udf_node *unode; 593 struct file_entry *fe; 594 int error, sector, size; 595 596 error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL); 597 if (error || *vpp != NULL) 598 return (error); 599 600 td = curthread; 601 udfmp = VFSTOUDFFS(mp); 602 603 unode = uma_zalloc(udf_zone_node, M_WAITOK | M_ZERO); 604 605 if ((error = udf_allocv(mp, &vp, td))) { 606 printf("Error from udf_allocv\n"); 607 uma_zfree(udf_zone_node, unode); 608 return (error); 609 } 610 611 unode->i_vnode = vp; 612 unode->hash_id = ino; 613 unode->udfmp = udfmp; 614 vp->v_data = unode; 615 616 lockmgr(vp->v_vnlock, LK_EXCLUSIVE, NULL, td); 617 error = insmntque(vp, mp); 618 if (error != 0) { 619 uma_zfree(udf_zone_node, unode); 620 return (error); 621 } 622 error = vfs_hash_insert(vp, ino, flags, td, vpp, NULL, NULL); 623 if (error || *vpp != NULL) 624 return (error); 625 626 /* 627 * Copy in the file entry. Per the spec, the size can only be 1 block. 628 */ 629 sector = ino + udfmp->part_start; 630 devvp = udfmp->im_devvp; 631 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 632 printf("Cannot read sector %d\n", sector); 633 vgone(vp); 634 vput(vp); 635 brelse(bp); 636 *vpp = NULL; 637 return (error); 638 } 639 640 fe = (struct file_entry *)bp->b_data; 641 if (udf_checktag(&fe->tag, TAGID_FENTRY)) { 642 printf("Invalid file entry!\n"); 643 vgone(vp); 644 vput(vp); 645 brelse(bp); 646 *vpp = NULL; 647 return (ENOMEM); 648 } 649 size = UDF_FENTRY_SIZE + le32toh(fe->l_ea) + le32toh(fe->l_ad); 650 MALLOC(unode->fentry, struct file_entry *, size, M_UDFFENTRY, 651 M_NOWAIT | M_ZERO); 652 if (unode->fentry == NULL) { 653 printf("Cannot allocate file entry block\n"); 654 vgone(vp); 655 vput(vp); 656 brelse(bp); 657 *vpp = NULL; 658 return (ENOMEM); 659 } 660 661 bcopy(bp->b_data, unode->fentry, size); 662 663 brelse(bp); 664 bp = NULL; 665 666 switch (unode->fentry->icbtag.file_type) { 667 default: 668 vp->v_type = VBAD; 669 break; 670 case 4: 671 vp->v_type = VDIR; 672 break; 673 case 5: 674 vp->v_type = VREG; 675 break; 676 case 6: 677 vp->v_type = VBLK; 678 break; 679 case 7: 680 vp->v_type = VCHR; 681 break; 682 case 9: 683 vp->v_type = VFIFO; 684 break; 685 case 10: 686 vp->v_type = VSOCK; 687 break; 688 case 12: 689 vp->v_type = VLNK; 690 break; 691 } 692 *vpp = vp; 693 694 return (0); 695 } 696 697 static int 698 udf_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 699 { 700 struct ifid *ifhp; 701 struct vnode *nvp; 702 struct udf_node *np; 703 off_t fsize; 704 int error; 705 706 ifhp = (struct ifid *)fhp; 707 708 if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 709 *vpp = NULLVP; 710 return (error); 711 } 712 713 np = VTON(nvp); 714 fsize = le64toh(np->fentry->inf_len); 715 716 *vpp = nvp; 717 vnode_create_vobject(*vpp, fsize, curthread); 718 return (0); 719 } 720 721 static int 722 udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd) 723 { 724 struct part_map_spare *pms; 725 struct regid *pmap_id; 726 struct buf *bp; 727 unsigned char regid_id[UDF_REGID_ID_SIZE + 1]; 728 int i, k, ptype, psize, error; 729 uint8_t *pmap = (uint8_t *) &lvd->maps[0]; 730 731 for (i = 0; i < le32toh(lvd->n_pm); i++) { 732 ptype = pmap[0]; 733 psize = pmap[1]; 734 if (((ptype != 1) && (ptype != 2)) || 735 ((psize != UDF_PMAP_TYPE1_SIZE) && 736 (psize != UDF_PMAP_TYPE2_SIZE))) { 737 printf("Invalid partition map found\n"); 738 return (1); 739 } 740 741 if (ptype == 1) { 742 /* Type 1 map. We don't care */ 743 pmap += UDF_PMAP_TYPE1_SIZE; 744 continue; 745 } 746 747 /* Type 2 map. Gotta find out the details */ 748 pmap_id = (struct regid *)&pmap[4]; 749 bzero(®id_id[0], UDF_REGID_ID_SIZE); 750 bcopy(&pmap_id->id[0], ®id_id[0], UDF_REGID_ID_SIZE); 751 752 if (bcmp(®id_id[0], "*UDF Sparable Partition", 753 UDF_REGID_ID_SIZE)) { 754 printf("Unsupported partition map: %s\n", ®id_id[0]); 755 return (1); 756 } 757 758 pms = (struct part_map_spare *)pmap; 759 pmap += UDF_PMAP_TYPE2_SIZE; 760 MALLOC(udfmp->s_table, struct udf_sparing_table *, 761 le32toh(pms->st_size), M_UDFMOUNT, M_NOWAIT | M_ZERO); 762 if (udfmp->s_table == NULL) 763 return (ENOMEM); 764 765 /* Calculate the number of sectors per packet. */ 766 /* XXX Logical or physical? */ 767 udfmp->p_sectors = le16toh(pms->packet_len) / udfmp->bsize; 768 769 /* 770 * XXX If reading the first Sparing Table fails, should look 771 * for another table. 772 */ 773 if ((error = udf_readlblks(udfmp, le32toh(pms->st_loc[0]), 774 le32toh(pms->st_size), &bp)) != 0) { 775 if (bp != NULL) 776 brelse(bp); 777 printf("Failed to read Sparing Table at sector %d\n", 778 le32toh(pms->st_loc[0])); 779 FREE(udfmp->s_table, M_UDFMOUNT); 780 return (error); 781 } 782 bcopy(bp->b_data, udfmp->s_table, le32toh(pms->st_size)); 783 brelse(bp); 784 785 if (udf_checktag(&udfmp->s_table->tag, 0)) { 786 printf("Invalid sparing table found\n"); 787 FREE(udfmp->s_table, M_UDFMOUNT); 788 return (EINVAL); 789 } 790 791 /* See how many valid entries there are here. The list is 792 * supposed to be sorted. 0xfffffff0 and higher are not valid 793 */ 794 for (k = 0; k < le16toh(udfmp->s_table->rt_l); k++) { 795 udfmp->s_table_entries = k; 796 if (le32toh(udfmp->s_table->entries[k].org) >= 797 0xfffffff0) 798 break; 799 } 800 } 801 802 return (0); 803 }
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