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: releng/5.0/sys/fs/udf/udf_vfsops.c 105077 2002-10-14 03:20:36Z mckusick $ 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/kernel.h> 83 #include <sys/malloc.h> 84 #include <sys/mount.h> 85 #include <sys/namei.h> 86 #include <sys/proc.h> 87 #include <sys/queue.h> 88 #include <sys/vnode.h> 89 90 #include <vm/uma.h> 91 92 #include <fs/udf/ecma167-udf.h> 93 #include <fs/udf/udf.h> 94 #include <fs/udf/osta.h> 95 96 MALLOC_DEFINE(M_UDFMOUNT, "UDF mount", "UDF mount structure"); 97 MALLOC_DEFINE(M_UDFFENTRY, "UDF fentry", "UDF file entry structure"); 98 MALLOC_DEFINE(M_UDFSTABLE, "UDF s_table", "UDF sparing table"); 99 100 /* Zones */ 101 uma_zone_t udf_zone_trans = NULL; 102 uma_zone_t udf_zone_node = NULL; 103 uma_zone_t udf_zone_ds = NULL; 104 105 static int udf_init(struct vfsconf *); 106 static int udf_uninit(struct vfsconf *); 107 static int udf_mount(struct mount *, struct nameidata *, struct thread *); 108 static int udf_unmount(struct mount *, int, struct thread *); 109 static int udf_root(struct mount *, struct vnode **); 110 static int udf_statfs(struct mount *, struct statfs *, struct thread *); 111 static int udf_fhtovp(struct mount *, struct fid *, struct vnode **); 112 static int udf_vptofh(struct vnode *, struct fid *); 113 static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *); 114 115 static struct vfsops udf_vfsops = { 116 NULL, 117 vfs_stdstart, 118 udf_unmount, 119 udf_root, 120 vfs_stdquotactl, 121 udf_statfs, 122 vfs_stdsync, 123 udf_vget, 124 udf_fhtovp, 125 vfs_stdcheckexp, 126 udf_vptofh, 127 udf_init, 128 udf_uninit, 129 vfs_stdextattrctl, 130 udf_mount, 131 }; 132 VFS_SET(udf_vfsops, udf, VFCF_READONLY); 133 134 static int udf_mountfs(struct vnode *, struct mount *, struct thread *); 135 136 static int 137 udf_init(struct vfsconf *foo) 138 { 139 140 /* 141 * This code used to pre-allocate a certain number of pages for each 142 * pool, reducing the need to grow the zones later on. UMA doesn't 143 * advertise any such functionality, unfortunately =-< 144 */ 145 udf_zone_trans = uma_zcreate("UDF translation buffer, zone", MAXNAMLEN * 146 sizeof(unicode_t), NULL, NULL, NULL, NULL, 0, 0); 147 148 udf_zone_node = uma_zcreate("UDF Node zone", sizeof(struct udf_node), 149 NULL, NULL, NULL, NULL, 0, 0); 150 151 udf_zone_ds = uma_zcreate("UDF Dirstream zone", 152 sizeof(struct udf_dirstream), NULL, NULL, NULL, NULL, 0, 0); 153 154 if ((udf_zone_node == NULL) || (udf_zone_trans == NULL) || 155 (udf_zone_ds == NULL)) { 156 printf("Cannot create allocation zones.\n"); 157 return (ENOMEM); 158 } 159 160 return 0; 161 } 162 163 static int 164 udf_uninit(struct vfsconf *foo) 165 { 166 167 if (udf_zone_trans != NULL) { 168 uma_zdestroy(udf_zone_trans); 169 udf_zone_trans = NULL; 170 } 171 172 if (udf_zone_node != NULL) { 173 uma_zdestroy(udf_zone_node); 174 udf_zone_node = NULL; 175 } 176 177 if (udf_zone_ds != NULL) { 178 uma_zdestroy(udf_zone_ds); 179 udf_zone_ds = NULL; 180 } 181 182 return (0); 183 } 184 185 static int 186 udf_mount(struct mount *mp, struct nameidata *ndp, struct thread *td) 187 { 188 struct vnode *devvp; /* vnode of the mount device */ 189 struct udf_mnt *imp = 0; 190 struct export_args *export; 191 struct vfsoptlist *opts; 192 char *fspec; 193 size_t size; 194 int error, len; 195 196 opts = mp->mnt_optnew; 197 198 if ((mp->mnt_flag & MNT_RDONLY) == 0) 199 return (EROFS); 200 201 /* 202 * No root filesystem support. Probably not a big deal, since the 203 * bootloader doesn't understand UDF. 204 */ 205 if (mp->mnt_flag & MNT_ROOTFS) 206 return (ENOTSUP); 207 208 fspec = NULL; 209 error = vfs_getopt(opts, "from", (void **)&fspec, &len); 210 if (!error && fspec[len - 1] != '\0') 211 return (EINVAL); 212 213 if (mp->mnt_flag & MNT_UPDATE) { 214 imp = VFSTOUDFFS(mp); 215 if (fspec == NULL) { 216 error = vfs_getopt(opts, "export", (void **)&export, 217 &len); 218 if (error || len != sizeof(struct export_args)) 219 return (EINVAL); 220 return (vfs_export(mp, export)); 221 } 222 } 223 224 /* Check that the mount device exists */ 225 if (fspec == NULL) 226 return (EINVAL); 227 NDINIT(ndp, LOOKUP, FOLLOW, UIO_SYSSPACE, fspec, td); 228 if ((error = namei(ndp))) 229 return (error); 230 NDFREE(ndp, NDF_ONLY_PNBUF); 231 devvp = ndp->ni_vp; 232 233 if (vn_isdisk(devvp, &error) == 0) { 234 vrele(devvp); 235 return (error); 236 } 237 238 /* Check the access rights on the mount device */ 239 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 240 error = VOP_ACCESS(devvp, VREAD, td->td_ucred, td); 241 if (error) 242 error = suser(td); 243 if (error) { 244 vput(devvp); 245 return (error); 246 } 247 VOP_UNLOCK(devvp, 0, td); 248 249 if ((error = udf_mountfs(devvp, mp, td))) { 250 vrele(devvp); 251 return (error); 252 } 253 254 imp = VFSTOUDFFS(mp); 255 copystr(fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 256 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 257 udf_statfs(mp, &mp->mnt_stat, td); 258 return 0; 259 }; 260 261 /* 262 * Check the descriptor tag for both the correct id and correct checksum. 263 * Return zero if all is good, EINVAL if not. 264 */ 265 int 266 udf_checktag(struct desc_tag *tag, uint16_t id) 267 { 268 uint8_t *itag; 269 uint8_t i, cksum = 0; 270 271 itag = (uint8_t *)tag; 272 273 if (tag->id != id) 274 return (EINVAL); 275 276 for (i = 0; i < 15; i++) 277 cksum = cksum + itag[i]; 278 cksum = cksum - itag[4]; 279 280 if (cksum == tag->cksum) 281 return (0); 282 283 return (EINVAL); 284 } 285 286 static int 287 udf_mountfs(struct vnode *devvp, struct mount *mp, struct thread *td) { 288 struct buf *bp = NULL; 289 struct anchor_vdp avdp; 290 struct udf_mnt *udfmp = NULL; 291 struct part_desc *pd; 292 struct logvol_desc *lvd; 293 struct fileset_desc *fsd; 294 struct file_entry *root_fentry; 295 uint32_t sector, size, mvds_start, mvds_end; 296 uint32_t fsd_offset = 0; 297 uint16_t part_num = 0, fsd_part = 0; 298 int error = EINVAL, needclose = 0; 299 int logvol_found = 0, part_found = 0, fsd_found = 0; 300 int bsize; 301 302 /* 303 * Disallow multiple mounts of the same device. Flush the buffer 304 * cache for the device. 305 */ 306 if ((error = vfs_mountedon(devvp))) 307 return (error); 308 if (vcount(devvp) > 1) 309 return (EBUSY); 310 if ((error = vinvalbuf(devvp, V_SAVE, td->td_ucred, td, 0, 0))) 311 return (error); 312 313 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY, td); 314 error = VOP_OPEN(devvp, FREAD, FSCRED, td); 315 VOP_UNLOCK(devvp, 0, td); 316 if (error) 317 return error; 318 needclose = 1; 319 320 MALLOC(udfmp, struct udf_mnt *, sizeof(struct udf_mnt), M_UDFMOUNT, 321 M_NOWAIT | M_ZERO); 322 if (udfmp == NULL) { 323 printf("Cannot allocate UDF mount struct\n"); 324 error = ENOMEM; 325 goto bail; 326 } 327 328 mp->mnt_data = (qaddr_t)udfmp; 329 mp->mnt_stat.f_fsid.val[0] = dev2udev(devvp->v_rdev); 330 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 331 mp->mnt_flag |= MNT_LOCAL; 332 udfmp->im_mountp = mp; 333 udfmp->im_dev = devvp->v_rdev; 334 udfmp->im_devvp = devvp; 335 336 bsize = 2048; /* XXX Should probe the media for it's size */ 337 338 /* 339 * Get the Anchor Volume Descriptor Pointer from sector 256. 340 * XXX Should also check sector n - 256, n, and 512. 341 */ 342 sector = 256; 343 if ((error = bread(devvp, sector * btodb(bsize), bsize, NOCRED, 344 &bp)) != 0) 345 goto bail; 346 if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR))) 347 goto bail; 348 349 bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp)); 350 brelse(bp); 351 bp = NULL; 352 353 /* 354 * Extract the Partition Descriptor and Logical Volume Descriptor 355 * from the Volume Descriptor Sequence. 356 * XXX Should we care about the partition type right now? 357 * XXX What about multiple partitions? 358 */ 359 mvds_start = avdp.main_vds_ex.loc; 360 mvds_end = mvds_start + (avdp.main_vds_ex.len - 1) / bsize; 361 for (sector = mvds_start; sector < mvds_end; sector++) { 362 if ((error = bread(devvp, sector * btodb(bsize), bsize, 363 NOCRED, &bp)) != 0) { 364 printf("Can't read sector %d of VDS\n", sector); 365 goto bail; 366 } 367 lvd = (struct logvol_desc *)bp->b_data; 368 if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) { 369 udfmp->bsize = lvd->lb_size; 370 udfmp->bmask = udfmp->bsize - 1; 371 udfmp->bshift = ffs(udfmp->bsize) - 1; 372 fsd_part = lvd->_lvd_use.fsd_loc.loc.part_num; 373 fsd_offset = lvd->_lvd_use.fsd_loc.loc.lb_num; 374 if (udf_find_partmaps(udfmp, lvd)) 375 break; 376 logvol_found = 1; 377 } 378 pd = (struct part_desc *)bp->b_data; 379 if (!udf_checktag(&pd->tag, TAGID_PARTITION)) { 380 part_found = 1; 381 part_num = pd->part_num; 382 udfmp->part_len = pd->part_len; 383 udfmp->part_start = pd->start_loc; 384 } 385 386 brelse(bp); 387 bp = NULL; 388 if ((part_found) && (logvol_found)) 389 break; 390 } 391 392 if (!part_found || !logvol_found) { 393 error = EINVAL; 394 goto bail; 395 } 396 397 if (fsd_part != part_num) { 398 printf("FSD does not lie within the partition!\n"); 399 error = EINVAL; 400 goto bail; 401 } 402 403 404 /* 405 * Grab the Fileset Descriptor 406 * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing 407 * me in the right direction here. 408 */ 409 sector = udfmp->part_start + fsd_offset; 410 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 411 printf("Cannot read sector %d of FSD\n", sector); 412 goto bail; 413 } 414 fsd = (struct fileset_desc *)bp->b_data; 415 if (!udf_checktag(&fsd->tag, TAGID_FSD)) { 416 fsd_found = 1; 417 bcopy(&fsd->rootdir_icb, &udfmp->root_icb, 418 sizeof(struct long_ad)); 419 } 420 421 brelse(bp); 422 bp = NULL; 423 424 if (!fsd_found) { 425 printf("Couldn't find the fsd\n"); 426 error = EINVAL; 427 goto bail; 428 } 429 430 /* 431 * Find the file entry for the root directory. 432 */ 433 sector = udfmp->root_icb.loc.lb_num + udfmp->part_start; 434 size = udfmp->root_icb.len; 435 if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) { 436 printf("Cannot read sector %d\n", sector); 437 goto bail; 438 } 439 440 root_fentry = (struct file_entry *)bp->b_data; 441 if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) { 442 printf("Invalid root file entry!\n"); 443 goto bail; 444 } 445 446 brelse(bp); 447 bp = NULL; 448 449 TAILQ_INIT(&udfmp->udf_tqh); 450 devvp->v_rdev->si_mountpoint = mp; 451 452 mtx_init(&udfmp->hash_mtx, "udf_hash", NULL, MTX_DEF); 453 return 0; 454 455 bail: 456 if (udfmp != NULL) 457 FREE(udfmp, M_UDFMOUNT); 458 if (bp != NULL) 459 brelse(bp); 460 if (needclose) 461 VOP_CLOSE(devvp, FREAD, NOCRED, td); 462 return error; 463 }; 464 465 static int 466 udf_unmount(struct mount *mp, int mntflags, struct thread *td) 467 { 468 struct udf_mnt *udfmp; 469 int error, flags = 0; 470 471 udfmp = VFSTOUDFFS(mp); 472 473 if (mntflags & MNT_FORCE) 474 flags |= FORCECLOSE; 475 476 if ((error = vflush(mp, 0, flags))) 477 return (error); 478 479 udfmp->im_devvp->v_rdev->si_mountpoint = NULL; 480 error = VOP_CLOSE(udfmp->im_devvp, FREAD, NOCRED, td); 481 vrele(udfmp->im_devvp); 482 483 if (udfmp->s_table != NULL) 484 FREE(udfmp->s_table, M_UDFSTABLE); 485 FREE(udfmp, M_UDFMOUNT); 486 487 mp->mnt_data = (qaddr_t)0; 488 mp->mnt_flag &= ~MNT_LOCAL; 489 490 return (0); 491 } 492 493 static int 494 udf_root(struct mount *mp, struct vnode **vpp) 495 { 496 struct udf_mnt *udfmp; 497 struct vnode *vp; 498 ino_t id; 499 int error; 500 501 udfmp = VFSTOUDFFS(mp); 502 503 id = udf_getid(&udfmp->root_icb); 504 505 error = udf_vget(mp, id, LK_EXCLUSIVE, vpp); 506 if (error) 507 return error; 508 509 vp = *vpp; 510 vp->v_vflag |= VV_ROOT; 511 udfmp->root_vp = vp; 512 513 return (0); 514 } 515 516 static int 517 udf_statfs(struct mount *mp, struct statfs *sbp, struct thread *td) 518 { 519 struct udf_mnt *udfmp; 520 521 udfmp = VFSTOUDFFS(mp); 522 523 sbp->f_bsize = udfmp->bsize; 524 sbp->f_iosize = udfmp->bsize; 525 sbp->f_blocks = udfmp->part_len; 526 sbp->f_bfree = 0; 527 sbp->f_bavail = 0; 528 sbp->f_files = 0; 529 sbp->f_ffree = 0; 530 if (sbp != &mp->mnt_stat) { 531 sbp->f_type = mp->mnt_vfc->vfc_typenum; 532 bcopy(mp->mnt_stat.f_mntonname, sbp->f_mntonname, MNAMELEN); 533 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 534 } 535 536 return 0; 537 } 538 539 int 540 udf_vget(struct mount *mp, ino_t ino, int flags, struct vnode **vpp) 541 { 542 struct buf *bp; 543 struct vnode *devvp; 544 struct udf_mnt *udfmp; 545 struct thread *td; 546 struct vnode *vp; 547 struct udf_node *unode; 548 struct file_entry *fe; 549 int error, sector, size; 550 551 td = curthread; 552 udfmp = VFSTOUDFFS(mp); 553 554 /* See if we already have this in the cache */ 555 if ((error = udf_hashlookup(udfmp, ino, flags, vpp)) != 0) 556 return (error); 557 if (*vpp != NULL) { 558 return (0); 559 } 560 561 /* 562 * Allocate memory and check the tag id's before grabbing a new 563 * vnode, since it's hard to roll back if there is a problem. 564 */ 565 unode = uma_zalloc(udf_zone_node, M_WAITOK); 566 if (unode == NULL) { 567 printf("Cannot allocate udf node\n"); 568 return (ENOMEM); 569 } 570 571 /* 572 * Copy in the file entry. Per the spec, the size can only be 1 block. 573 */ 574 sector = ino + udfmp->part_start; 575 devvp = udfmp->im_devvp; 576 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 577 printf("Cannot read sector %d\n", sector); 578 uma_zfree(udf_zone_node, unode); 579 return (error); 580 } 581 582 fe = (struct file_entry *)bp->b_data; 583 if (udf_checktag(&fe->tag, TAGID_FENTRY)) { 584 printf("Invalid file entry!\n"); 585 uma_zfree(udf_zone_node, unode); 586 brelse(bp); 587 return (ENOMEM); 588 } 589 size = UDF_FENTRY_SIZE + fe->l_ea + fe->l_ad; 590 MALLOC(unode->fentry, struct file_entry *, size, M_UDFFENTRY, 591 M_NOWAIT | M_ZERO); 592 if (unode->fentry == NULL) { 593 printf("Cannot allocate file entry block\n"); 594 uma_zfree(udf_zone_node, unode); 595 brelse(bp); 596 return (ENOMEM); 597 } 598 599 bcopy(bp->b_data, unode->fentry, size); 600 601 brelse(bp); 602 bp = NULL; 603 604 if ((error = udf_allocv(mp, &vp, td))) { 605 printf("Error from udf_allocv\n"); 606 uma_zfree(udf_zone_node, unode); 607 return (error); 608 } 609 610 unode->i_vnode = vp; 611 unode->hash_id = ino; 612 unode->i_devvp = udfmp->im_devvp; 613 unode->i_dev = udfmp->im_dev; 614 unode->udfmp = udfmp; 615 vp->v_data = unode; 616 VREF(udfmp->im_devvp); 617 udf_hashins(unode); 618 619 switch (unode->fentry->icbtag.file_type) { 620 default: 621 vp->v_type = VBAD; 622 break; 623 case 4: 624 vp->v_type = VDIR; 625 break; 626 case 5: 627 vp->v_type = VREG; 628 break; 629 case 6: 630 vp->v_type = VBLK; 631 break; 632 case 7: 633 vp->v_type = VCHR; 634 break; 635 case 9: 636 vp->v_type = VFIFO; 637 break; 638 case 10: 639 vp->v_type = VSOCK; 640 break; 641 case 12: 642 vp->v_type = VLNK; 643 break; 644 } 645 *vpp = vp; 646 647 return (0); 648 } 649 650 struct ifid { 651 ushort ifid_len; 652 ushort ifid_pad; 653 int ifid_ino; 654 long ifid_start; 655 }; 656 657 static int 658 udf_fhtovp(struct mount *mp, struct fid *fhp, struct vnode **vpp) 659 { 660 struct ifid *ifhp; 661 struct vnode *nvp; 662 int error; 663 664 ifhp = (struct ifid *)fhp; 665 666 if ((error = VFS_VGET(mp, ifhp->ifid_ino, LK_EXCLUSIVE, &nvp)) != 0) { 667 *vpp = NULLVP; 668 return (error); 669 } 670 671 *vpp = nvp; 672 return (0); 673 } 674 675 static int 676 udf_vptofh (struct vnode *vp, struct fid *fhp) 677 { 678 struct udf_node *node; 679 struct ifid *ifhp; 680 681 node = VTON(vp); 682 ifhp = (struct ifid *)fhp; 683 ifhp->ifid_len = sizeof(struct ifid); 684 ifhp->ifid_ino = node->hash_id; 685 686 return (0); 687 } 688 689 static int 690 udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd) 691 { 692 union udf_pmap *pmap; 693 struct part_map_spare *pms; 694 struct regid *pmap_id; 695 struct buf *bp; 696 unsigned char regid_id[UDF_REGID_ID_SIZE + 1]; 697 int i, ptype, psize, error; 698 699 for (i = 0; i < lvd->n_pm; i++) { 700 pmap = (union udf_pmap *)&lvd->maps[i * UDF_PMAP_SIZE]; 701 ptype = pmap->data[0]; 702 psize = pmap->data[1]; 703 if (((ptype != 1) && (ptype != 2)) || 704 ((psize != UDF_PMAP_SIZE) && (psize != 6))) { 705 printf("Invalid partition map found\n"); 706 return (1); 707 } 708 709 if (ptype == 1) { 710 /* Type 1 map. We don't care */ 711 continue; 712 } 713 714 /* Type 2 map. Gotta find out the details */ 715 pmap_id = (struct regid *)&pmap->data[4]; 716 bzero(®id_id[0], UDF_REGID_ID_SIZE); 717 bcopy(&pmap_id->id[0], ®id_id[0], UDF_REGID_ID_SIZE); 718 719 if (bcmp(®id_id[0], "*UDF Sparable Partition", 720 UDF_REGID_ID_SIZE)) { 721 printf("Unsupported partition map: %s\n", ®id_id[0]); 722 return (1); 723 } 724 725 pms = &pmap->pms; 726 MALLOC(udfmp->s_table, struct udf_sparing_table *, pms->st_size, 727 M_UDFSTABLE, M_NOWAIT | M_ZERO); 728 if (udfmp->s_table == NULL) 729 return (ENOMEM); 730 731 /* Calculate the number of sectors per packet. */ 732 /* XXX Logical or physical? */ 733 udfmp->p_sectors = pms->packet_len / udfmp->bsize; 734 735 /* 736 * XXX If reading the first Sparing Table fails, should look 737 * for another table. 738 */ 739 if ((error = udf_readlblks(udfmp, pms->st_loc[0], pms->st_size, 740 &bp)) != 0) { 741 printf("Failed to read Sparing Table at sector %d\n", 742 pms->st_loc[0]); 743 return (error); 744 } 745 bcopy(bp->b_data, udfmp->s_table, pms->st_size); 746 brelse(bp); 747 748 if (udf_checktag(&udfmp->s_table->tag, 0)) { 749 printf("Invalid sparing table found\n"); 750 return (EINVAL); 751 } 752 753 /* See how many valid entries there are here. The list is 754 * supposed to be sorted. 0xfffffff0 and higher are not valid 755 */ 756 for (i = 0; i < udfmp->s_table->rt_l; i++) { 757 udfmp->s_table_entries = i; 758 if (udfmp->s_table->entries[i].org >= 0xfffffff0) 759 break; 760 } 761 } 762 763 return (0); 764 }
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