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: src/sys/fs/udf/udf_vfsops.c,v 1.16 2003/11/05 06:56:08 scottl Exp $ 27 * $DragonFly: src/sys/vfs/udf/udf_vfsops.c,v 1.28 2008/09/17 21:44:25 dillon Exp $ 28 */ 29 30 /* udf_vfsops.c */ 31 /* Implement the VFS side of things */ 32 33 /* 34 * Ok, here's how it goes. The UDF specs are pretty clear on how each data 35 * structure is made up, but not very clear on how they relate to each other. 36 * Here is the skinny... This demostrates a filesystem with one file in the 37 * root directory. Subdirectories are treated just as normal files, but they 38 * have File Id Descriptors of their children as their file data. As for the 39 * Anchor Volume Descriptor Pointer, it can exist in two of the following three 40 * places: sector 256, sector n (the max sector of the disk), or sector 41 * n - 256. It's a pretty good bet that one will exist at sector 256 though. 42 * One caveat is unclosed CD media. For that, sector 256 cannot be written, 43 * so the Anchor Volume Descriptor Pointer can exist at sector 512 until the 44 * media is closed. 45 * 46 * Sector: 47 * 256: 48 * n: Anchor Volume Descriptor Pointer 49 * n - 256: | 50 * | 51 * |-->Main Volume Descriptor Sequence 52 * | | 53 * | | 54 * | |-->Logical Volume Descriptor 55 * | | 56 * |-->Partition Descriptor | 57 * | | 58 * | | 59 * |-->Fileset Descriptor 60 * | 61 * | 62 * |-->Root Dir File Entry 63 * | 64 * | 65 * |-->File data: 66 * File Id Descriptor 67 * | 68 * | 69 * |-->File Entry 70 * | 71 * | 72 * |-->File data 73 */ 74 75 #include <sys/types.h> 76 #include <sys/param.h> 77 #include <sys/systm.h> 78 #include <sys/uio.h> 79 #include <sys/buf.h> 80 #include <sys/conf.h> 81 #include <sys/fcntl.h> 82 #include <sys/module.h> 83 #include <sys/kernel.h> 84 #include <sys/malloc.h> 85 #include <sys/mount.h> 86 #include <sys/nlookup.h> 87 #include <sys/proc.h> 88 #include <sys/priv.h> 89 #include <sys/queue.h> 90 #include <sys/vnode.h> 91 92 #include <sys/buf2.h> 93 94 #include <vfs/udf/ecma167-udf.h> 95 #include <vfs/udf/osta.h> 96 #include <vfs/udf/udf.h> 97 #include <vfs/udf/udf_mount.h> 98 99 extern struct vop_ops udf_vnode_vops; 100 101 MALLOC_DEFINE(M_UDFNODE, "UDF node", "UDF node structure"); 102 MALLOC_DEFINE(M_UDFMOUNT, "UDF mount", "UDF mount structure"); 103 MALLOC_DEFINE(M_UDFFENTRY, "UDF fentry", "UDF file entry structure"); 104 105 static int udf_mount(struct mount *, char *, caddr_t, struct ucred *); 106 static int udf_unmount(struct mount *, int); 107 static int udf_root(struct mount *, struct vnode **); 108 static int udf_statfs(struct mount *, struct statfs *, struct ucred *); 109 static int udf_fhtovp(struct mount *, struct vnode *, 110 struct fid *, struct vnode **); 111 static int udf_vptofh(struct vnode *, struct fid *); 112 113 static int udf_find_partmaps(struct udf_mnt *, struct logvol_desc *); 114 115 static struct vfsops udf_vfsops = { 116 .vfs_mount = udf_mount, 117 .vfs_unmount = udf_unmount, 118 .vfs_root = udf_root, 119 .vfs_statfs = udf_statfs, 120 .vfs_sync = vfs_stdsync, 121 .vfs_vget = udf_vget, 122 .vfs_fhtovp = udf_fhtovp, 123 .vfs_vptofh = udf_vptofh 124 }; 125 VFS_SET(udf_vfsops, udf, VFCF_READONLY); 126 127 MODULE_VERSION(udf, 1); 128 129 static int udf_mountfs(struct vnode *, struct mount *); 130 131 static int 132 udf_mount(struct mount *mp, char *path, caddr_t data, struct ucred *cred) 133 { 134 struct vnode *devvp; /* vnode of the mount device */ 135 struct udf_args args; 136 struct udf_mnt *imp = 0; 137 size_t size; 138 int error; 139 struct nlookupdata nd; 140 141 if ((mp->mnt_flag & MNT_RDONLY) == 0) 142 return (EROFS); 143 144 /* 145 * No root filesystem support. Probably not a big deal, since the 146 * bootloader doesn't understand UDF. 147 */ 148 if (mp->mnt_flag & MNT_ROOTFS) 149 return (ENOTSUP); 150 151 if ((error = copyin(data, (caddr_t)&args, sizeof(struct udf_args)))) 152 return(error); 153 154 if (mp->mnt_flag & MNT_UPDATE) { 155 imp = VFSTOUDFFS(mp); 156 if (args.fspec == NULL) 157 return(vfs_export(mp, &imp->im_export, &args.export)); 158 } 159 160 /* Check that the mount device exists */ 161 devvp = NULL; 162 error = nlookup_init(&nd, args.fspec, UIO_USERSPACE, NLC_FOLLOW); 163 if (error == 0) 164 error = nlookup(&nd); 165 if (error == 0) 166 error = cache_vref(&nd.nl_nch, nd.nl_cred, &devvp); 167 nlookup_done(&nd); 168 if (error) 169 return (error); 170 171 if (vn_isdisk(devvp, &error) == 0) { 172 vrele(devvp); 173 return(error); 174 } 175 176 /* Check the access rights on the mount device */ 177 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 178 error = VOP_EACCESS(devvp, VREAD, cred); 179 if (error) 180 error = priv_check_cred(cred, PRIV_ROOT, 0); 181 if (error) { 182 vput(devvp); 183 return(error); 184 } 185 vn_unlock(devvp); 186 187 if ((error = udf_mountfs(devvp, mp))) { 188 vrele(devvp); 189 return(error); 190 } 191 192 imp = VFSTOUDFFS(mp); 193 194 imp->im_flags = args.flags; 195 196 copyinstr(args.fspec, mp->mnt_stat.f_mntfromname, MNAMELEN - 1, &size); 197 bzero(mp->mnt_stat.f_mntfromname + size, MNAMELEN - size); 198 udf_statfs(mp, &mp->mnt_stat, cred); 199 return(0); 200 } 201 202 /* 203 * Check the descriptor tag for both the correct id and correct checksum. 204 * Return zero if all is good, EINVAL if not. 205 */ 206 int 207 udf_checktag(struct desc_tag *tag, uint16_t id) 208 { 209 uint8_t *itag; 210 uint8_t i, cksum = 0; 211 212 itag = (uint8_t *)tag; 213 214 if (tag->id != id) 215 return(EINVAL); 216 217 for (i = 0; i < 15; i++) 218 cksum = cksum + itag[i]; 219 cksum = cksum - itag[4]; 220 221 if (cksum == tag->cksum) 222 return(0); 223 224 return(EINVAL); 225 } 226 227 static int 228 udf_mountfs(struct vnode *devvp, struct mount *mp) 229 { 230 struct buf *bp = NULL; 231 struct anchor_vdp avdp; 232 struct udf_mnt *udfmp = NULL; 233 struct part_desc *pd; 234 struct logvol_desc *lvd; 235 struct fileset_desc *fsd; 236 struct file_entry *root_fentry; 237 cdev_t dev; 238 uint32_t sector, size, mvds_start, mvds_end; 239 uint32_t fsd_offset = 0; 240 uint16_t part_num = 0, fsd_part = 0; 241 int error = EINVAL, needclose = 0; 242 int logvol_found = 0, part_found = 0, fsd_found = 0; 243 int bsize; 244 245 /* 246 * Disallow multiple mounts of the same device. Flush the buffer 247 * cache for the device. 248 */ 249 if ((error = vfs_mountedon(devvp))) 250 return(error); 251 if (vcount(devvp) > 0) 252 return(EBUSY); 253 if ((error = vinvalbuf(devvp, V_SAVE, 0, 0))) 254 return(error); 255 256 vn_lock(devvp, LK_EXCLUSIVE | LK_RETRY); 257 error = VOP_OPEN(devvp, FREAD, FSCRED, NULL); 258 vn_unlock(devvp); 259 if (error) 260 return(error); 261 needclose = 1; 262 dev = devvp->v_rdev; 263 264 udfmp = kmalloc(sizeof(*udfmp), M_UDFMOUNT, M_WAITOK | M_ZERO); 265 266 mp->mnt_data = (qaddr_t)udfmp; 267 mp->mnt_stat.f_fsid.val[0] = dev2udev(dev); 268 mp->mnt_stat.f_fsid.val[1] = mp->mnt_vfc->vfc_typenum; 269 mp->mnt_maxsymlinklen = 0; 270 mp->mnt_flag |= MNT_LOCAL; 271 udfmp->im_mountp = mp; 272 udfmp->im_dev = dev; 273 udfmp->im_devvp = devvp; 274 275 bsize = 2048; /* XXX Should probe the media for it's size */ 276 277 /* 278 * Get the Anchor Volume Descriptor Pointer from sector 256. 279 * XXX Should also check sector n - 256, n, and 512. 280 */ 281 sector = 256; 282 if ((error = bread(devvp, (off_t)sector * bsize, bsize, &bp)) != 0) 283 goto bail; 284 if ((error = udf_checktag((struct desc_tag *)bp->b_data, TAGID_ANCHOR))) 285 goto bail; 286 287 bcopy(bp->b_data, &avdp, sizeof(struct anchor_vdp)); 288 brelse(bp); 289 bp = NULL; 290 291 /* 292 * Extract the Partition Descriptor and Logical Volume Descriptor 293 * from the Volume Descriptor Sequence. 294 * XXX Should we care about the partition type right now? 295 * XXX What about multiple partitions? 296 */ 297 mvds_start = avdp.main_vds_ex.loc; 298 mvds_end = mvds_start + (avdp.main_vds_ex.len - 1) / bsize; 299 for (sector = mvds_start; sector < mvds_end; sector++) { 300 if ((error = bread(devvp, (off_t)sector * bsize, bsize, 301 &bp)) != 0) { 302 kprintf("Can't read sector %d of VDS\n", sector); 303 goto bail; 304 } 305 lvd = (struct logvol_desc *)bp->b_data; 306 if (!udf_checktag(&lvd->tag, TAGID_LOGVOL)) { 307 udfmp->bsize = lvd->lb_size; 308 udfmp->bmask = udfmp->bsize - 1; 309 udfmp->bshift = ffs(udfmp->bsize) - 1; 310 fsd_part = lvd->_lvd_use.fsd_loc.loc.part_num; 311 fsd_offset = lvd->_lvd_use.fsd_loc.loc.lb_num; 312 if (udf_find_partmaps(udfmp, lvd)) 313 break; 314 logvol_found = 1; 315 } 316 pd = (struct part_desc *)bp->b_data; 317 if (!udf_checktag(&pd->tag, TAGID_PARTITION)) { 318 part_found = 1; 319 part_num = pd->part_num; 320 udfmp->part_len = pd->part_len; 321 udfmp->part_start = pd->start_loc; 322 } 323 324 brelse(bp); 325 bp = NULL; 326 if ((part_found) && (logvol_found)) 327 break; 328 } 329 330 if (!part_found || !logvol_found) { 331 error = EINVAL; 332 goto bail; 333 } 334 335 if (fsd_part != part_num) { 336 kprintf("FSD does not lie within the partition!\n"); 337 error = EINVAL; 338 goto bail; 339 } 340 341 342 /* 343 * Grab the Fileset Descriptor 344 * Thanks to Chuck McCrobie <mccrobie@cablespeed.com> for pointing 345 * me in the right direction here. 346 */ 347 sector = udfmp->part_start + fsd_offset; 348 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 349 kprintf("Cannot read sector %d of FSD\n", sector); 350 goto bail; 351 } 352 fsd = (struct fileset_desc *)bp->b_data; 353 if (!udf_checktag(&fsd->tag, TAGID_FSD)) { 354 fsd_found = 1; 355 bcopy(&fsd->rootdir_icb, &udfmp->root_icb, 356 sizeof(struct long_ad)); 357 } 358 359 brelse(bp); 360 bp = NULL; 361 362 if (!fsd_found) { 363 kprintf("Couldn't find the fsd\n"); 364 error = EINVAL; 365 goto bail; 366 } 367 368 vfs_add_vnodeops(mp, &udf_vnode_vops, &mp->mnt_vn_norm_ops); 369 370 /* 371 * Find the file entry for the root directory. 372 */ 373 sector = udfmp->root_icb.loc.lb_num + udfmp->part_start; 374 size = udfmp->root_icb.len; 375 if ((error = udf_readlblks(udfmp, sector, size, &bp)) != 0) { 376 kprintf("Cannot read sector %d\n", sector); 377 goto bail; 378 } 379 380 root_fentry = (struct file_entry *)bp->b_data; 381 if ((error = udf_checktag(&root_fentry->tag, TAGID_FENTRY))) { 382 kprintf("Invalid root file entry!\n"); 383 goto bail; 384 } 385 386 brelse(bp); 387 bp = NULL; 388 389 lwkt_token_init(&udfmp->hash_token, "udfihash"); 390 udfmp->hashtbl = phashinit(UDF_HASHTBLSIZE, M_UDFMOUNT, &udfmp->hashsz); 391 392 return(0); 393 394 bail: 395 if (udfmp != NULL) 396 kfree(udfmp, M_UDFMOUNT); 397 if (bp != NULL) 398 brelse(bp); 399 if (needclose) 400 VOP_CLOSE(devvp, FREAD); 401 return(error); 402 } 403 404 static int 405 udf_unmount(struct mount *mp, int mntflags) 406 { 407 struct udf_mnt *udfmp; 408 int error, flags = 0; 409 410 udfmp = VFSTOUDFFS(mp); 411 412 if (mntflags & MNT_FORCE) 413 flags |= FORCECLOSE; 414 415 if ((error = vflush(mp, 0, flags))) 416 return (error); 417 418 udfmp->im_devvp->v_rdev->si_mountpoint = NULL; 419 error = VOP_CLOSE(udfmp->im_devvp, FREAD); 420 vrele(udfmp->im_devvp); 421 422 if (udfmp->s_table) 423 kfree(udfmp->s_table, M_UDFMOUNT); 424 if (udfmp->hashtbl) 425 kfree(udfmp->hashtbl, M_UDFMOUNT); 426 kfree(udfmp, M_UDFMOUNT); 427 428 mp->mnt_data = (qaddr_t)0; 429 mp->mnt_flag &= ~MNT_LOCAL; 430 431 return (error); 432 } 433 434 static int 435 udf_root(struct mount *mp, struct vnode **vpp) 436 { 437 struct udf_mnt *udfmp; 438 struct vnode *vp; 439 ino_t id; 440 int error; 441 442 udfmp = VFSTOUDFFS(mp); 443 444 id = udf_getid(&udfmp->root_icb); 445 446 error = udf_vget(mp, NULL, id, vpp); 447 if (error) 448 return(error); 449 450 vp = *vpp; 451 vsetflags(vp, VROOT); 452 udfmp->root_vp = vp; 453 454 return(0); 455 } 456 457 static int 458 udf_statfs(struct mount *mp, struct statfs *sbp, struct ucred *cred) 459 { 460 struct udf_mnt *udfmp; 461 462 udfmp = VFSTOUDFFS(mp); 463 464 sbp->f_bsize = udfmp->bsize; 465 sbp->f_iosize = udfmp->bsize; 466 sbp->f_blocks = udfmp->part_len; 467 sbp->f_bfree = 0; 468 sbp->f_bavail = 0; 469 sbp->f_files = 0; 470 sbp->f_ffree = 0; 471 if (sbp != &mp->mnt_stat) { 472 sbp->f_type = mp->mnt_vfc->vfc_typenum; 473 bcopy(mp->mnt_stat.f_mntfromname, sbp->f_mntfromname, MNAMELEN); 474 } 475 476 return(0); 477 } 478 479 int 480 udf_vget(struct mount *mp, struct vnode *dvp, ino_t ino, struct vnode **vpp) 481 { 482 struct buf *bp; 483 struct vnode *devvp; 484 struct udf_mnt *udfmp; 485 struct thread *td; 486 struct vnode *vp; 487 struct udf_node *unode; 488 struct file_entry *fe; 489 int error, sector, size; 490 491 td = curthread; 492 udfmp = VFSTOUDFFS(mp); 493 494 /* See if we already have this in the cache */ 495 if ((error = udf_hashlookup(udfmp, ino, vpp)) != 0) 496 return(error); 497 if (*vpp != NULL) { 498 return(0); 499 } 500 501 /* 502 * Allocate memory and check the tag id's before grabbing a new 503 * vnode, since it's hard to roll back if there is a problem. 504 */ 505 unode = kmalloc(sizeof(*unode), M_UDFNODE, M_WAITOK | M_ZERO); 506 507 /* 508 * Copy in the file entry. Per the spec, the size can only be 1 block. 509 */ 510 sector = ino + udfmp->part_start; 511 devvp = udfmp->im_devvp; 512 if ((error = RDSECTOR(devvp, sector, udfmp->bsize, &bp)) != 0) { 513 kprintf("Cannot read sector %d\n", sector); 514 kfree(unode, M_UDFNODE); 515 return(error); 516 } 517 518 fe = (struct file_entry *)bp->b_data; 519 if (udf_checktag(&fe->tag, TAGID_FENTRY)) { 520 kprintf("Invalid file entry!\n"); 521 kfree(unode, M_UDFNODE); 522 brelse(bp); 523 return(ENOMEM); 524 } 525 size = UDF_FENTRY_SIZE + fe->l_ea + fe->l_ad; 526 unode->fentry = kmalloc(size, M_UDFFENTRY, M_WAITOK | M_ZERO); 527 528 bcopy(bp->b_data, unode->fentry, size); 529 530 brelse(bp); 531 bp = NULL; 532 533 if ((error = udf_allocv(mp, &vp))) { 534 kprintf("Error from udf_allocv\n"); 535 kfree(unode, M_UDFNODE); 536 return(error); 537 } 538 539 unode->i_vnode = vp; 540 unode->hash_id = ino; 541 unode->i_devvp = udfmp->im_devvp; 542 unode->i_dev = udfmp->im_dev; 543 unode->udfmp = udfmp; 544 vp->v_data = unode; 545 vref(udfmp->im_devvp); 546 udf_hashins(unode); 547 548 switch (unode->fentry->icbtag.file_type) { 549 default: 550 vp->v_type = VBAD; 551 break; 552 case 4: 553 vp->v_type = VDIR; 554 break; 555 case 5: 556 vp->v_type = VREG; 557 break; 558 case 6: 559 vp->v_type = VBLK; 560 break; 561 case 7: 562 vp->v_type = VCHR; 563 break; 564 case 9: 565 vp->v_type = VFIFO; 566 break; 567 case 10: 568 vp->v_type = VSOCK; 569 break; 570 case 12: 571 vp->v_type = VLNK; 572 break; 573 } 574 /* 575 * Locked and refd vnode returned 576 */ 577 *vpp = vp; 578 579 return(0); 580 } 581 582 struct ifid { 583 u_short ifid_len; 584 u_short ifid_pad; 585 int ifid_ino; 586 long ifid_start; 587 }; 588 589 static int 590 udf_fhtovp(struct mount *mp, struct vnode *rootvp, 591 struct fid *fhp, struct vnode **vpp) 592 { 593 struct ifid *ifhp; 594 struct vnode *nvp; 595 int error; 596 597 ifhp = (struct ifid *)fhp; 598 599 if ((error = VFS_VGET(mp, NULL, ifhp->ifid_ino, &nvp)) != 0) { 600 *vpp = NULLVP; 601 return(error); 602 } 603 604 *vpp = nvp; 605 return(0); 606 } 607 608 static int 609 udf_vptofh (struct vnode *vp, struct fid *fhp) 610 { 611 struct udf_node *node; 612 struct ifid *ifhp; 613 614 node = VTON(vp); 615 ifhp = (struct ifid *)fhp; 616 ifhp->ifid_len = sizeof(struct ifid); 617 ifhp->ifid_ino = node->hash_id; 618 619 return(0); 620 } 621 622 static int 623 udf_find_partmaps(struct udf_mnt *udfmp, struct logvol_desc *lvd) 624 { 625 union udf_pmap *pmap; 626 struct part_map_spare *pms; 627 struct regid *pmap_id; 628 struct buf *bp; 629 unsigned char regid_id[UDF_REGID_ID_SIZE + 1]; 630 int ptype, psize, error; 631 unsigned int i; 632 633 for (i = 0; i < lvd->n_pm; i++) { 634 pmap = (union udf_pmap *)&lvd->maps[i * UDF_PMAP_SIZE]; 635 ptype = pmap->data[0]; 636 psize = pmap->data[1]; 637 if (((ptype != 1) && (ptype != 2)) || 638 ((psize != UDF_PMAP_SIZE) && (psize != 6))) { 639 kprintf("Invalid partition map found\n"); 640 return(1); 641 } 642 643 if (ptype == 1) { 644 /* Type 1 map. We don't care */ 645 continue; 646 } 647 648 /* Type 2 map. Gotta find out the details */ 649 pmap_id = (struct regid *)&pmap->data[4]; 650 bzero(®id_id[0], UDF_REGID_ID_SIZE); 651 bcopy(&pmap_id->id[0], ®id_id[0], UDF_REGID_ID_SIZE); 652 653 if (bcmp(®id_id[0], "*UDF Sparable Partition", 654 UDF_REGID_ID_SIZE)) { 655 kprintf("Unsupported partition map: %s\n", ®id_id[0]); 656 return(1); 657 } 658 659 pms = &pmap->pms; 660 udfmp->s_table = kmalloc(pms->st_size, M_UDFMOUNT, 661 M_WAITOK | M_ZERO); 662 663 /* Calculate the number of sectors per packet. */ 664 /* XXX Logical or physical? */ 665 udfmp->p_sectors = pms->packet_len / udfmp->bsize; 666 667 /* 668 * XXX If reading the first Sparing Table fails, should look 669 * for another table. 670 */ 671 if ((error = udf_readlblks(udfmp, pms->st_loc[0], pms->st_size, 672 &bp)) != 0) { 673 if (bp) 674 brelse(bp); 675 kprintf("Failed to read Sparing Table at sector %d\n", 676 pms->st_loc[0]); 677 return(error); 678 } 679 bcopy(bp->b_data, udfmp->s_table, pms->st_size); 680 brelse(bp); 681 682 if (udf_checktag(&udfmp->s_table->tag, 0)) { 683 kprintf("Invalid sparing table found\n"); 684 return(EINVAL); 685 } 686 687 /* See how many valid entries there are here. The list is 688 * supposed to be sorted. 0xfffffff0 and higher are not valid 689 */ 690 for (i = 0; i < udfmp->s_table->rt_l; i++) { 691 udfmp->s_table_entries = i; 692 if (udfmp->s_table->entries[i].org >= 0xfffffff0) 693 break; 694 } 695 } 696 697 return(0); 698 } 699