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/proc.h> 88 #include <sys/queue.h> 89 #include <sys/vnode.h> 90 #include <sys/endian.h> 91 92 #include <geom/geom.h> 93 #include <geom/geom_vfs.h> 94 95 #include <vm/uma.h> 96 97 #include <fs/udf/ecma167-udf.h> 98 #include <fs/udf/osta.h> 99 #include <fs/udf/udf.h> 100 #include <fs/udf/udf_mount.h> 101 102 static MALLOC_DEFINE(M_UDFMOUNT, "UDF mount", "UDF mount structure"); 103 MALLOC_DEFINE(M_UDFFENTRY, "UDF fentry", "UDF file entry structure"); 104 105 struct iconv_functions *udf_iconv = NULL; 106 107 /* Zones */ 108 uma_zone_t udf_zone_trans = NULL; 109 uma_zone_t udf_zone_node = NULL; 110 uma_zone_t udf_zone_ds = NULL; 111 112 static vfs_init_t udf_init; 113 static vfs_uninit_t udf_uninit; 114 static vfs_mount_t udf_mount; 115 static vfs_root_t udf_root; 116 static vfs_statfs_t udf_statfs; 117 static vfs_unmount_t udf_unmount; 118 static vfs_fhtovp_t udf_fhtovp; 119 static vfs_vptofh_t udf_vptofh; 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 .vfs_vptofh = udf_vptofh, 133 }; 134 VFS_SET(udf_vfsops, udf, VFCF_READONLY); 135 136 MODULE_VERSION(udf, 1); 137 138 static int udf_mountfs(struct vnode *, struct mount *, struct thread *); 139 140 static int 141 udf_init(struct vfsconf *foo) 142 { 143 144 /* 145 * This code used to pre-allocate a certain number of pages for each 146 * pool, reducing the need to grow the zones later on. UMA doesn't 147 * advertise any such functionality, unfortunately =-< 148 */ 149 udf_zone_trans = uma_zcreate("UDF translation buffer, zone", MAXNAMLEN * 150 sizeof(unicode_t), NULL, NULL, NULL, NULL, 0, 0); 151 152 udf_zone_node = uma_zcreate("UDF Node zone", sizeof(struct udf_node), 153 NULL, NULL, NULL, NULL, 0, 0); 154 155 udf_zone_ds = uma_zcreate("UDF Dirstream zone", 156 sizeof(struct udf_dirstream), NULL, NULL, NULL, NULL, 0, 0); 157 158 if ((udf_zone_node == NULL) || (udf_zone_trans == NULL) || 159 (udf_zone_ds == NULL)) { 160 printf("Cannot create allocation zones.\n"); 161 return (ENOMEM); 162 } 163 164 return 0; 165 } 166 167 static int 168 udf_uninit(struct vfsconf *foo) 169 { 170 171 if (udf_zone_trans != NULL) { 172 uma_zdestroy(udf_zone_trans); 173 udf_zone_trans = NULL; 174 } 175 176 if (udf_zone_node != NULL) { 177 uma_zdestroy(udf_zone_node); 178 udf_zone_node = NULL; 179 } 180 181 if (udf_zone_ds != NULL) { 182 uma_zdestroy(udf_zone_ds); 183 udf_zone_ds = NULL; 184 } 185 186 return (0); 187 } 188 189 static int 190 udf_mount(struct mount *mp, struct thread *td) 191 { 192 struct vnode *devvp; /* vnode of the mount device */ 193 struct udf_mnt *imp = 0; 194 struct vfsoptlist *opts; 195 char *fspec, *cs_disk, *cs_local; 196 int error, len, *udf_flags; 197 struct nameidata nd, *ndp = &nd; 198 199 opts = mp->mnt_optnew; 200 201 if ((mp->mnt_flag & MNT_RDONLY) == 0) 202 return (EROFS); 203 204 /* 205 * No root filesystem support. Probably not a big deal, since the 206 * bootloader doesn't understand UDF. 207 */ 208 if (mp->mnt_flag & MNT_ROOTFS) 209 return (ENOTSUP); 210 211 fspec = NULL; 212 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 213 if (!error && fspec[len - 1] != '\0') 214 return (EINVAL); 215 216 if (mp->mnt_flag & MNT_UPDATE) { 217 return (0); 218 } 219 220 /* Check that the mount device exists */ 221 if (fspec == NULL) 222 return (EINVAL); 223 NDINIT(ndp, LOOKUP, FOLLOW | LOCKLEAF, UIO_SYSSPACE, fspec, td); 224 if ((error = namei(ndp))) 225 return (error); 226 NDFREE(ndp, NDF_ONLY_PNBUF); 227 devvp = ndp->ni_vp; 228 229 if (vn_isdisk(devvp, &error) == 0) { 230 vput(devvp); 231 return (error); 232 } 233 234 /* Check the access rights on the mount device */ 235 error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td); 236 if (error) 237 error = suser(td); 238 if (error) { 239 vput(devvp); 240 return (error); 241 } 242 243 if ((error = udf_mountfs(devvp, mp, td))) { 244 vrele(devvp); 245 return (error); 246 } 247 248 imp = VFSTOUDFFS(mp); 249 250 udf_flags = NULL; 251 error = vfs_getopt(opts, "flags", (void **)&udf_flags, &len); 252 if (error || len != sizeof(int)) 253 return (EINVAL); 254 imp->im_flags = *udf_flags; 255 256 if (imp->im_flags & UDFMNT_KICONV && udf_iconv) { 257 cs_disk = NULL; 258 error = vfs_getopt(opts, "cs_disk", (void **)&cs_disk, &len); 259 if (!error && cs_disk[len - 1] != '\0') 260 return (EINVAL); 261 cs_local = NULL; 262 error = vfs_getopt(opts, "cs_local", (void **)&cs_local, &len); 263 if (!error && cs_local[len - 1] != '\0') 264 return (EINVAL); 265 udf_iconv->open(cs_local, cs_disk, &imp->im_d2l); 266 #if 0 267 udf_iconv->open(cs_disk, cs_local, &imp->im_l2d); 268 #endif 269 } 270 271 vfs_mountedfrom(mp, fspec); 272 return 0; 273 }; 274 275 /* 276 * Check the descriptor tag for both the correct id and correct checksum. 277 * Return zero if all is good, EINVAL if not. 278 */ 279 int 280 udf_checktag(struct desc_tag *tag, uint16_t id) 281 { 282 uint8_t *itag; 283 uint8_t i, cksum = 0; 284 285 itag = (uint8_t *)tag; 286 287 if (tag->id != id) 288 return (EINVAL); 289 290 for (i = 0; i < 16; i++) 291 cksum = cksum + itag[i]; 292 cksum = cksum - itag[4]; 293 294 if (cksum == tag->cksum) 295 return (0); 296 297 return (EINVAL); 298 } 299 300 static int 301 udf_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td) { 302 struct buf *bp = NULL; 303 struct anchor_vdp avdp; 304 struct udf_mnt *udfmp = NULL; 305 struct part_desc *pd; 306 struct logvol_desc *lvd; 307 struct fileset_desc *fsd; 308 struct file_entry *root_fentry; 309 uint32_t sector, size, mvds_start, mvds_end; 310 uint32_t fsd_offset = 0; 311 uint16_t part_num = 0, fsd_part = 0; 312 int error = EINVAL; 313 int logvol_found = 0, part_found = 0, fsd_found = 0; 314 int bsize; 315 struct g_consumer *cp; 316 struct bufobj *bo; 317 318 DROP_GIANT(); 319 g_topology_lock(); 320 error = g_vfs_open(devvp, &cp, "udf", 0); 321 g_topology_unlock(); 322 PICKUP_GIANT(); 323 VOP_UNLOCK(devvp, 0, td); 324 if (error) 325 return error; 326 327 bo = &devvp->v_bufobj; 328 329 /* XXX: should be M_WAITOK */ 330 MALLOC(udfmp, struct udf_mnt *, sizeof(struct udf_mnt), M_UDFMOUNT, 331 M_NOWAIT | M_ZERO); 332 if (udfmp == NULL) { 333 printf("Cannot allocate UDF mount struct\n"); 334 error = ENOMEM; 335 goto bail; 336 } 337 338 mp->mnt_data = (qaddr_t)udfmp; 339 mp->mnt_stat.f_fsid.val[0] = dev2udev(devvp->v_rdev); 340 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 341 MNT_ILOCK(mp); 342 mp->mnt_flag |= MNT_LOCAL; 343 MNT_IUNLOCK(mp); 344 udfmp->im_mountp = mp; 345 udfmp->im_dev = devvp->v_rdev; 346 udfmp->im_devvp = devvp; 347 udfmp->im_d2l = NULL; 348 udfmp->im_cp = cp; 349 udfmp->im_bo = bo; 350 351 #if 0 352 udfmp->im_l2d = NULL; 353 #endif 354 355 bsize = 2048; /* XXX Should probe the media for it's size */ 356 357 /* 358 * Get the Anchor Volume Descriptor Pointer from sector 256. 359 * XXX Should also check sector n - 256, n, and 512. 360 */ 361 sector = 256; 362 if ((error = bread(devvp, sector * btodb(bsize), bsize, NOCRED, 363 &bp)) != 0) 364 goto bail; 365 if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR))) 366 goto bail; 367 368 bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp)); 369 brelse(bp); 370 bp = NULL; 371 372 /* 373 * Extract the Partition Descriptor and Logical Volume Descriptor 374 * from the Volume Descriptor Sequence. 375 * XXX Should we care about the partition type right now? 376 * XXX What about multiple partitions? 377 */ 378 mvds_start = le32toh(avdp.main_vds_ex.loc); 379 mvds_end = mvds_start + (le32toh(avdp.main_vds_ex.len) - 1) / bsize; 380 for (sector = mvds_start; sector < mvds_end; sector++) { 381 if ((error = bread(devvp, sector * btodb(bsize), bsize, 382 NOCRED, &bp)) != 0) { 383 printf("Can't read sector %d of VDS\n", sector); 384 goto bail; 385 } 386 lvd = (struct logvol_desc *)bp->b_data; 387 if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) { 388 udfmp->bsize = le32toh(lvd->lb_size); 389 udfmp->bmask = udfmp->bsize - 1; 390 udfmp->bshift = ffs(udfmp->bsize) - 1; 391 fsd_part = le16toh(lvd->_lvd_use.fsd_loc.loc.part_num); 392 fsd_offset = le32toh(lvd->_lvd_use.fsd_loc.loc.lb_num); 393 if (udf_find_partmaps(udfmp, lvd)) 394 break; 395 logvol_found = 1; 396 } 397 pd = (struct part_desc *)bp->b_data; 398 if (!udf_checktag(&pd->tag, TAGID_PARTITION)) { 399 part_found = 1; 400 part_num = le16toh(pd->part_num); 401 udfmp->part_len = le32toh(pd->part_len); 402 udfmp->part_start = le32toh(pd->start_loc); 403 } 404 405 brelse(bp); 406 bp = NULL; 407 if ((part_found) && (logvol_found)) 408 break; 409 } 410 411 if (!part_found || !logvol_found) { 412 error = EINVAL; 413 goto bail; 414 } 415 416 if (fsd_part != part_num) { 417 printf("FSD does not lie within the partition!\n"); 418 error = EINVAL; 419 goto bail; 420 } 421 422 423 /* 424 * Grab the Fileset Descriptor 425 * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing 426 * me in the right direction here. 427 */ 428 sector = udfmp->part_start + fsd_offset; 429 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 430 printf("Cannot read sector %d of FSD\n", sector); 431 goto bail; 432 } 433 fsd = (struct fileset_desc *)bp->b_data; 434 if (!udf_checktag(&fsd->tag, TAGID_FSD)) { 435 fsd_found = 1; 436 bcopy(&fsd->rootdir_icb, &udfmp->root_icb, 437 sizeof(struct long_ad)); 438 } 439 440 brelse(bp); 441 bp = NULL; 442 443 if (!fsd_found) { 444 printf("Couldn't find the fsd\n"); 445 error = EINVAL; 446 goto bail; 447 } 448 449 /* 450 * Find the file entry for the root directory. 451 */ 452 sector = le32toh(udfmp->root_icb.loc.lb_num) + udfmp->part_start; 453 size = le32toh(udfmp->root_icb.len); 454 if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) { 455 printf("Cannot read sector %d\n", sector); 456 goto bail; 457 } 458 459 root_fentry = (struct file_entry *)bp->b_data; 460 if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) { 461 printf("Invalid root file entry!\n"); 462 goto bail; 463 } 464 465 brelse(bp); 466 bp = NULL; 467 468 return 0; 469 470 bail: 471 if (udfmp != NULL) 472 FREE(udfmp, M_UDFMOUNT); 473 if (bp != NULL) 474 brelse(bp); 475 DROP_GIANT(); 476 g_topology_lock(); 477 g_vfs_close(cp, td); 478 g_topology_unlock(); 479 PICKUP_GIANT(); 480 return error; 481 }; 482 483 static int 484 udf_unmount(struct mount *mp, int mntflags, struct thread *td) 485 { 486 struct udf_mnt *udfmp; 487 int error, flags = 0; 488 489 udfmp = VFSTOUDFFS(mp); 490 491 if (mntflags & MNT_FORCE) 492 flags |= FORCECLOSE; 493 494 if ((error = vflush(mp, 0, flags, td))) 495 return (error); 496 497 if (udfmp->im_flags & UDFMNT_KICONV && udf_iconv) { 498 if (udfmp->im_d2l) 499 udf_iconv->close(udfmp->im_d2l); 500 #if 0 501 if (udfmp->im_l2d) 502 udf_iconv->close(udfmp->im_l2d); 503 #endif 504 } 505 506 DROP_GIANT(); 507 g_topology_lock(); 508 g_vfs_close(udfmp->im_cp, td); 509 g_topology_unlock(); 510 PICKUP_GIANT(); 511 vrele(udfmp->im_devvp); 512 513 if (udfmp->s_table != NULL) 514 FREE(udfmp->s_table, M_UDFMOUNT); 515 516 FREE(udfmp, M_UDFMOUNT); 517 518 mp->mnt_data = (qaddr_t)0; 519 MNT_ILOCK(mp); 520 mp->mnt_flag &= ~MNT_LOCAL; 521 MNT_IUNLOCK(mp); 522 523 return (0); 524 } 525 526 static int 527 udf_root(struct mount *mp, int flags, struct vnode **vpp, struct thread *td) 528 { 529 struct udf_mnt *udfmp; 530 struct vnode *vp; 531 ino_t id; 532 int error; 533 534 udfmp = VFSTOUDFFS(mp); 535 536 id = udf_getid(&udfmp->root_icb); 537 538 error = udf_vget(mp, id, LK_EXCLUSIVE, vpp); 539 if (error) 540 return error; 541 542 vp = *vpp; 543 vp->v_vflag |= VV_ROOT; 544 545 return (0); 546 } 547 548 static int 549 udf_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 550 { 551 struct udf_mnt *udfmp; 552 553 udfmp = VFSTOUDFFS(mp); 554 555 sbp->f_bsize = udfmp->bsize; 556 sbp->f_iosize = udfmp->bsize; 557 sbp->f_blocks = udfmp->part_len; 558 sbp->f_bfree = 0; 559 sbp->f_bavail = 0; 560 sbp->f_files = 0; 561 sbp->f_ffree = 0; 562 return 0; 563 } 564 565 int 566 udf_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 567 { 568 struct buf *bp; 569 struct vnode *devvp; 570 struct udf_mnt *udfmp; 571 struct thread *td; 572 struct vnode *vp; 573 struct udf_node *unode; 574 struct file_entry *fe; 575 int error, sector, size; 576 577 error = vfs_hash_get(mp, ino, flags, curthread, vpp, NULL, NULL); 578 if (error || *vpp != NULL) 579 return (error); 580 581 td = curthread; 582 udfmp = VFSTOUDFFS(mp); 583 584 unode = uma_zalloc(udf_zone_node, M_WAITOK | M_ZERO); 585 586 if ((error = udf_allocv(mp, &vp, td))) { 587 printf("Error from udf_allocv\n"); 588 uma_zfree(udf_zone_node, unode); 589 return (error); 590 } 591 592 unode->i_vnode = vp; 593 unode->hash_id = ino; 594 unode->udfmp = udfmp; 595 vp->v_data = unode; 596 597 error = vfs_hash_insert(vp, ino, flags, curthread, vpp, NULL, NULL); 598 if (error || *vpp != NULL) 599 return (error); 600 601 /* 602 * Copy in the file entry. Per the spec, the size can only be 1 block. 603 */ 604 sector = ino + udfmp->part_start; 605 devvp = udfmp->im_devvp; 606 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 607 printf("Cannot read sector %d\n", sector); 608 vput(vp); 609 brelse(bp); 610 *vpp = NULL; 611 return (error); 612 } 613 614 fe = (struct file_entry *)bp->b_data; 615 if (udf_checktag(&fe->tag, TAGID_FENTRY)) { 616 printf("Invalid file entry!\n"); 617 vput(vp); 618 brelse(bp); 619 *vpp = NULL; 620 return (ENOMEM); 621 } 622 size = UDF_FENTRY_SIZE + le32toh(fe->l_ea) + le32toh(fe->l_ad); 623 MALLOC(unode->fentry, struct file_entry *, size, M_UDFFENTRY, 624 M_NOWAIT | M_ZERO); 625 if (unode->fentry == NULL) { 626 printf("Cannot allocate file entry block\n"); 627 vput(vp); 628 brelse(bp); 629 *vpp = NULL; 630 return (ENOMEM); 631 } 632 633 bcopy(bp->b_data, unode->fentry, size); 634 635 brelse(bp); 636 bp = NULL; 637 638 switch (unode->fentry->icbtag.file_type) { 639 default: 640 vp->v_type = VBAD; 641 break; 642 case 4: 643 vp->v_type = VDIR; 644 break; 645 case 5: 646 vp->v_type = VREG; 647 break; 648 case 6: 649 vp->v_type = VBLK; 650 break; 651 case 7: 652 vp->v_type = VCHR; 653 break; 654 case 9: 655 vp->v_type = VFIFO; 656 break; 657 case 10: 658 vp->v_type = VSOCK; 659 break; 660 case 12: 661 vp->v_type = VLNK; 662 break; 663 } 664 *vpp = vp; 665 666 return (0); 667 } 668 669 struct ifid { 670 u_short ifid_len; 671 u_short ifid_pad; 672 int ifid_ino; 673 long ifid_start; 674 }; 675 676 static int 677 udf_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 678 { 679 struct ifid *ifhp; 680 struct vnode *nvp; 681 struct udf_node *np; 682 off_t fsize; 683 int error; 684 685 ifhp = (struct ifid *)fhp; 686 687 if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 688 *vpp = NULLVP; 689 return (error); 690 } 691 692 np = VTON(nvp); 693 fsize = le64toh(np->fentry->inf_len); 694 695 *vpp = nvp; 696 vnode_create_vobject_off(*vpp, fsize, curthread); 697 return (0); 698 } 699 700 static int 701 udf_vptofh (struct vnode *vp, struct fid *fhp) 702 { 703 struct udf_node *node; 704 struct ifid *ifhp; 705 706 node = VTON(vp); 707 ifhp = (struct ifid *)fhp; 708 ifhp->ifid_len = sizeof(struct ifid); 709 ifhp->ifid_ino = node->hash_id; 710 711 return (0); 712 } 713 714 static int 715 udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd) 716 { 717 union udf_pmap *pmap; 718 struct part_map_spare *pms; 719 struct regid *pmap_id; 720 struct buf *bp; 721 unsigned char regid_id[UDF_REGID_ID_SIZE + 1]; 722 int i, ptype, psize, error; 723 724 for (i = 0; i < le32toh(lvd->n_pm); i++) { 725 pmap = (union udf_pmap *)&lvd->maps[i * UDF_PMAP_SIZE]; 726 ptype = pmap->data[0]; 727 psize = pmap->data[1]; 728 if (((ptype != 1) && (ptype != 2)) || 729 ((psize != UDF_PMAP_SIZE) && (psize != 6))) { 730 printf("Invalid partition map found\n"); 731 return (1); 732 } 733 734 if (ptype == 1) { 735 /* Type 1 map. We don't care */ 736 continue; 737 } 738 739 /* Type 2 map. Gotta find out the details */ 740 pmap_id = (struct regid *)&pmap->data[4]; 741 bzero(®id_id[0], UDF_REGID_ID_SIZE); 742 bcopy(&pmap_id->id[0], ®id_id[0], UDF_REGID_ID_SIZE); 743 744 if (bcmp(®id_id[0], "*UDF Sparable Partition", 745 UDF_REGID_ID_SIZE)) { 746 printf("Unsupported partition map: %s\n", ®id_id[0]); 747 return (1); 748 } 749 750 pms = &pmap->pms; 751 MALLOC(udfmp->s_table, struct udf_sparing_table *, 752 le32toh(pms->st_size), M_UDFMOUNT, M_NOWAIT | M_ZERO); 753 if (udfmp->s_table == NULL) 754 return (ENOMEM); 755 756 /* Calculate the number of sectors per packet. */ 757 /* XXX Logical or physical? */ 758 udfmp->p_sectors = le16toh(pms->packet_len) / udfmp->bsize; 759 760 /* 761 * XXX If reading the first Sparing Table fails, should look 762 * for another table. 763 */ 764 if ((error = udf_readlblks(udfmp, le32toh(pms->st_loc[0]), 765 le32toh(pms->st_size), &bp)) != 0) { 766 if (bp != NULL) 767 brelse(bp); 768 printf("Failed to read Sparing Table at sector %d\n", 769 le32toh(pms->st_loc[0])); 770 return (error); 771 } 772 bcopy(bp->b_data, udfmp->s_table, le32toh(pms->st_size)); 773 brelse(bp); 774 775 if (udf_checktag(&udfmp->s_table->tag, 0)) { 776 printf("Invalid sparing table found\n"); 777 return (EINVAL); 778 } 779 780 /* See how many valid entries there are here. The list is 781 * supposed to be sorted. 0xfffffff0 and higher are not valid 782 */ 783 for (i = 0; i < le16toh(udfmp->s_table->rt_l); i++) { 784 udfmp->s_table_entries = i; 785 if (le32toh(udfmp->s_table->entries[i].org) >= 786 0xfffffff0) 787 break; 788 } 789 } 790 791 return (0); 792 }
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