release/src-rt/linux/linux-2.6/fs/partitions/efi.c

   1 /************************************************************
   2  * EFI GUID Partition Table handling
   3  * Per Intel EFI Specification v1.02
   4  * http://developer.intel.com/technology/efi/efi.htm
   5  * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
   6  *   Copyright 2000,2001,2002,2004 Dell Inc.
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  *
  23  * TODO:
  24  *
  25  * Changelog:
  26  * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
  27  * - test for valid PMBR and valid PGPT before ever reading
  28  *   AGPT, allow override with 'gpt' kernel command line option.
  29  * - check for first/last_usable_lba outside of size of disk
  30  *
  31  * Tue  Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
  32  * - Ported to 2.5.7-pre1 and 2.5.7-dj2
  33  * - Applied patch to avoid fault in alternate header handling
  34  * - cleaned up find_valid_gpt
  35  * - On-disk structure and copy in memory is *always* LE now -
  36  *   swab fields as needed
  37  * - remove print_gpt_header()
  38  * - only use first max_p partition entries, to keep the kernel minor number
  39  *   and partition numbers tied.
  40  *
  41  * Mon  Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
  42  * - Removed __PRIPTR_PREFIX - not being used
  43  *
  44  * Mon  Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
  45  * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
  46  *
  47  * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
  48  * - Added compare_gpts().
  49  * - moved le_efi_guid_to_cpus() back into this file.  GPT is the only
  50  *   thing that keeps EFI GUIDs on disk.
  51  * - Changed gpt structure names and members to be simpler and more Linux-like.
  52  *
  53  * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
  54  * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
  55  *
  56  * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
  57  * - Changed function comments to DocBook style per Andreas Dilger suggestion.
  58  *
  59  * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
  60  * - Change read_lba() to use the page cache per Al Viro's work.
  61  * - print u64s properly on all architectures
  62  * - fixed debug_printk(), now Dprintk()
  63  *
  64  * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
  65  * - Style cleanups
  66  * - made most functions static
  67  * - Endianness addition
  68  * - remove test for second alternate header, as it's not per spec,
  69  *   and is unnecessary.  There's now a method to read/write the last
  70  *   sector of an odd-sized disk from user space.  No tools have ever
  71  *   been released which used this code, so it's effectively dead.
  72  * - Per Asit Mallick of Intel, added a test for a valid PMBR.
  73  * - Added kernel command line option 'gpt' to override valid PMBR test.
  74  *
  75  * Wed Jun  6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
  76  * - added devfs volume UUID support (/dev/volumes/uuids) for
  77  *   mounting file systems by the partition GUID.
  78  *
  79  * Tue Dec  5 2000 Matt Domsch <Matt_Domsch@dell.com>
  80  * - Moved crc32() to linux/lib, added efi_crc32().
  81  *
  82  * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
  83  * - Replaced Intel's CRC32 function with an equivalent
  84  *   non-license-restricted version.
  85  *
  86  * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
  87  * - Fixed the last_lba() call to return the proper last block
  88  *
  89  * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
  90  * - Thanks to Andries Brouwer for his debugging assistance.
  91  * - Code works, detects all the partitions.
  92  *
  93  ************************************************************/
  94 #include <linux/crc32.h>
  95 #include <asm/div64.h>
  96 #include "check.h"
  97 #include "efi.h"
  98
  99 #undef EFI_DEBUG
 100 #ifdef EFI_DEBUG
 101 #define Dprintk(x...) printk(KERN_DEBUG x)
 102 #else
 103 #define Dprintk(x...)
 104 #endif
 105
 106 /* This allows a kernel command line option 'gpt' to override
 107  * the test for invalid PMBR.  Not __initdata because reloading
 108  * the partition tables happens after init too.
 109  */
 110 static int force_gpt;
 111 static int __init
 112 force_gpt_fn(char *str)
 113 {
 114         force_gpt = 1;
 115         return 1;
 116 }
 117 __setup("gpt", force_gpt_fn);
 118
 119
 120 /**
 121  * efi_crc32() - EFI version of crc32 function
 122  * @buf: buffer to calculate crc32 of
 123  * @len - length of buf
 124  *
 125  * Description: Returns EFI-style CRC32 value for @buf
 126  *
 127  * This function uses the little endian Ethernet polynomial
 128  * but seeds the function with ~0, and xor's with ~0 at the end.
 129  * Note, the EFI Specification, v1.02, has a reference to
 130  * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
 131  */
 132 static inline u32
 133 efi_crc32(const void *buf, unsigned long len)
 134 {
 135         return (crc32(~0L, buf, len) ^ ~0L);
 136 }
 137
 138 /**
 139  * last_lba(): return number of last logical block of device
 140  * @bdev: block device
 141  *
 142  * Description: Returns last LBA value on success, 0 on error.
 143  * This is stored (by sd and ide-geometry) in
 144  *  the part[0] entry for this disk, and is the number of
 145  *  physical sectors available on the disk.
 146  */
 147 static u64
 148 last_lba(struct block_device *bdev)
 149 {
 150         if (!bdev || !bdev->bd_inode)
 151                 return 0;
 152         return div64_64(bdev->bd_inode->i_size, bdev_hardsect_size(bdev)) - 1ULL;
 153 }
 154
 155 static inline int
 156 pmbr_part_valid(struct partition *part)
 157 {
 158         if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
 159             le32_to_cpu(part->start_sect) == 1UL)
 160                 return 1;
 161         return 0;
 162 }
 163
 164 /**
 165  * is_pmbr_valid(): test Protective MBR for validity
 166  * @mbr: pointer to a legacy mbr structure
 167  *
 168  * Description: Returns 1 if PMBR is valid, 0 otherwise.
 169  * Validity depends on two things:
 170  *  1) MSDOS signature is in the last two bytes of the MBR
 171  *  2) One partition of type 0xEE is found
 172  */
 173 static int
 174 is_pmbr_valid(legacy_mbr *mbr)
 175 {
 176         int i;
 177         if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
 178                 return 0;
 179         for (i = 0; i < 4; i++)
 180                 if (pmbr_part_valid(&mbr->partition_record[i]))
 181                         return 1;
 182         return 0;
 183 }
 184
 185 /**
 186  * read_lba(): Read bytes from disk, starting at given LBA
 187  * @bdev
 188  * @lba
 189  * @buffer
 190  * @size_t
 191  *
 192  * Description:  Reads @count bytes from @bdev into @buffer.
 193  * Returns number of bytes read on success, 0 on error.
 194  */
 195 static size_t
 196 read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count)
 197 {
 198         size_t totalreadcount = 0;
 199         sector_t n = lba * (bdev_hardsect_size(bdev) >> 9);
 200
 201         if (!bdev || !buffer || lba > last_lba(bdev))
 202                 return 0;
 203
 204         while (count) {
 205                 int copied = 512;
 206                 Sector sect;
 207                unsigned char *data = read_dev_sector(bdev, n++, &sect);
 208                 if (!data)
 209                         break;
 210                 if (copied > count)
 211                         copied = count;
 212                 memcpy(buffer, data, copied);
 213                 put_dev_sector(sect);
 214                 buffer += copied;
 215                 totalreadcount +=copied;
 216                 count -= copied;
 217         }
 218         return totalreadcount;
 219 }
 220
 221 /**
 222  * alloc_read_gpt_entries(): reads partition entries from disk
 223  * @bdev
 224  * @gpt - GPT header
 225  *
 226  * Description: Returns ptes on success,  NULL on error.
 227  * Allocates space for PTEs based on information found in @gpt.
 228  * Notes: remember to free pte when you're done!
 229  */
 230 static gpt_entry *
 231 alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt)
 232 {
 233         size_t count;
 234         gpt_entry *pte;
 235         if (!bdev || !gpt)
 236                 return NULL;
 237
 238         count = le32_to_cpu(gpt->num_partition_entries) *
 239                 le32_to_cpu(gpt->sizeof_partition_entry);
 240         if (!count)
 241                 return NULL;
 242         pte = kzalloc(count, GFP_KERNEL);
 243         if (!pte)
 244                 return NULL;
 245
 246         if (read_lba(bdev, le64_to_cpu(gpt->partition_entry_lba),
 247                      (u8 *) pte,
 248                      count) < count) {
 249                 kfree(pte);
 250                 pte=NULL;
 251                 return NULL;
 252         }
 253         return pte;
 254 }
 255
 256 /**
 257  * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
 258  * @bdev
 259  * @lba is the Logical Block Address of the partition table
 260  *
 261  * Description: returns GPT header on success, NULL on error.   Allocates
 262  * and fills a GPT header starting at @ from @bdev.
 263  * Note: remember to free gpt when finished with it.
 264  */
 265 static gpt_header *
 266 alloc_read_gpt_header(struct block_device *bdev, u64 lba)
 267 {
 268         gpt_header *gpt;
 269         int sectsize = bdev_hardsect_size(bdev);
 270
 271         if (!bdev)
 272                 return NULL;
 273
 274         gpt = kzalloc(sectsize, GFP_KERNEL);
 275         if (!gpt)
 276                 return NULL;
 277
 278         if (read_lba(bdev, lba, (u8 *) gpt, sectsize) < sectsize) {
 279                 kfree(gpt);
 280                 gpt=NULL;
 281                 return NULL;
 282         }
 283
 284         return gpt;
 285 }
 286
 287 /**
 288  * is_gpt_valid() - tests one GPT header and PTEs for validity
 289  * @bdev
 290  * @lba is the logical block address of the GPT header to test
 291  * @gpt is a GPT header ptr, filled on return.
 292  * @ptes is a PTEs ptr, filled on return.
 293  *
 294  * Description: returns 1 if valid,  0 on error.
 295  * If valid, returns pointers to newly allocated GPT header and PTEs.
 296  */
 297 static int
 298 is_gpt_valid(struct block_device *bdev, u64 lba,
 299              gpt_header **gpt, gpt_entry **ptes)
 300 {
 301         u32 crc, origcrc;
 302         u64 lastlba;
 303
 304         if (!bdev || !gpt || !ptes)
 305                 return 0;
 306         if (!(*gpt = alloc_read_gpt_header(bdev, lba)))
 307                 return 0;
 308
 309         /* Check the GUID Partition Table signature */
 310         if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
 311                 Dprintk("GUID Partition Table Header signature is wrong:"
 312                         "%lld != %lld\n",
 313                         (unsigned long long)le64_to_cpu((*gpt)->signature),
 314                         (unsigned long long)GPT_HEADER_SIGNATURE);
 315                 goto fail;
 316         }
 317
 318         /* Check the GUID Partition Table CRC */
 319         origcrc = le32_to_cpu((*gpt)->header_crc32);
 320         (*gpt)->header_crc32 = 0;
 321         crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
 322
 323         if (crc != origcrc) {
 324                 Dprintk
 325                     ("GUID Partition Table Header CRC is wrong: %x != %x\n",
 326                      crc, origcrc);
 327                 goto fail;
 328         }
 329         (*gpt)->header_crc32 = cpu_to_le32(origcrc);
 330
 331         /* Check that the my_lba entry points to the LBA that contains
 332          * the GUID Partition Table */
 333         if (le64_to_cpu((*gpt)->my_lba) != lba) {
 334                 Dprintk("GPT my_lba incorrect: %lld != %lld\n",
 335                         (unsigned long long)le64_to_cpu((*gpt)->my_lba),
 336                         (unsigned long long)lba);
 337                 goto fail;
 338         }
 339
 340         /* Check the first_usable_lba and last_usable_lba are
 341          * within the disk.
 342          */
 343         lastlba = last_lba(bdev);
 344         if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
 345                 Dprintk("GPT: first_usable_lba incorrect: %lld > %lld\n",
 346                         (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
 347                         (unsigned long long)lastlba);
 348                 goto fail;
 349         }
 350         if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
 351                 Dprintk("GPT: last_usable_lba incorrect: %lld > %lld\n",
 352                         (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
 353                         (unsigned long long)lastlba);
 354                 goto fail;
 355         }
 356
 357         if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt)))
 358                 goto fail;
 359
 360         /* Check the GUID Partition Entry Array CRC */
 361         crc = efi_crc32((const unsigned char *) (*ptes),
 362                         le32_to_cpu((*gpt)->num_partition_entries) *
 363                         le32_to_cpu((*gpt)->sizeof_partition_entry));
 364
 365         if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
 366                 Dprintk("GUID Partitition Entry Array CRC check failed.\n");
 367                 goto fail_ptes;
 368         }
 369
 370         /* We're done, all's well */
 371         return 1;
 372
 373  fail_ptes:
 374         kfree(*ptes);
 375         *ptes = NULL;
 376  fail:
 377         kfree(*gpt);
 378         *gpt = NULL;
 379         return 0;
 380 }
 381
 382 /**
 383  * is_pte_valid() - tests one PTE for validity
 384  * @pte is the pte to check
 385  * @lastlba is last lba of the disk
 386  *
 387  * Description: returns 1 if valid,  0 on error.
 388  */
 389 static inline int
 390 is_pte_valid(const gpt_entry *pte, const u64 lastlba)
 391 {
 392         if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
 393             le64_to_cpu(pte->starting_lba) > lastlba         ||
 394             le64_to_cpu(pte->ending_lba)   > lastlba)
 395                 return 0;
 396         return 1;
 397 }
 398
 399 /**
 400  * compare_gpts() - Search disk for valid GPT headers and PTEs
 401  * @pgpt is the primary GPT header
 402  * @agpt is the alternate GPT header
 403  * @lastlba is the last LBA number
 404  * Description: Returns nothing.  Sanity checks pgpt and agpt fields
 405  * and prints warnings on discrepancies.
 406  *
 407  */
 408 static void
 409 compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
 410 {
 411         int error_found = 0;
 412         if (!pgpt || !agpt)
 413                 return;
 414         if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
 415                 printk(KERN_WARNING
 416                        "GPT:Primary header LBA != Alt. header alternate_lba\n");
 417                 printk(KERN_WARNING "GPT:%lld != %lld\n",
 418                        (unsigned long long)le64_to_cpu(pgpt->my_lba),
 419                        (unsigned long long)le64_to_cpu(agpt->alternate_lba));
 420                 error_found++;
 421         }
 422         if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
 423                 printk(KERN_WARNING
 424                        "GPT:Primary header alternate_lba != Alt. header my_lba\n");
 425                 printk(KERN_WARNING "GPT:%lld != %lld\n",
 426                        (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
 427                        (unsigned long long)le64_to_cpu(agpt->my_lba));
 428                 error_found++;
 429         }
 430         if (le64_to_cpu(pgpt->first_usable_lba) !=
 431             le64_to_cpu(agpt->first_usable_lba)) {
 432                 printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n");
 433                 printk(KERN_WARNING "GPT:%lld != %lld\n",
 434                        (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
 435                        (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
 436                 error_found++;
 437         }
 438         if (le64_to_cpu(pgpt->last_usable_lba) !=
 439             le64_to_cpu(agpt->last_usable_lba)) {
 440                 printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n");
 441                 printk(KERN_WARNING "GPT:%lld != %lld\n",
 442                        (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
 443                        (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
 444                 error_found++;
 445         }
 446         if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
 447                 printk(KERN_WARNING "GPT:disk_guids don't match.\n");
 448                 error_found++;
 449         }
 450         if (le32_to_cpu(pgpt->num_partition_entries) !=
 451             le32_to_cpu(agpt->num_partition_entries)) {
 452                 printk(KERN_WARNING "GPT:num_partition_entries don't match: "
 453                        "0x%x != 0x%x\n",
 454                        le32_to_cpu(pgpt->num_partition_entries),
 455                        le32_to_cpu(agpt->num_partition_entries));
 456                 error_found++;
 457         }
 458         if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
 459             le32_to_cpu(agpt->sizeof_partition_entry)) {
 460                 printk(KERN_WARNING
 461                        "GPT:sizeof_partition_entry values don't match: "
 462                        "0x%x != 0x%x\n",
 463                        le32_to_cpu(pgpt->sizeof_partition_entry),
 464                        le32_to_cpu(agpt->sizeof_partition_entry));
 465                 error_found++;
 466         }
 467         if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
 468             le32_to_cpu(agpt->partition_entry_array_crc32)) {
 469                 printk(KERN_WARNING
 470                        "GPT:partition_entry_array_crc32 values don't match: "
 471                        "0x%x != 0x%x\n",
 472                        le32_to_cpu(pgpt->partition_entry_array_crc32),
 473                        le32_to_cpu(agpt->partition_entry_array_crc32));
 474                 error_found++;
 475         }
 476         if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
 477                 printk(KERN_WARNING
 478                        "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
 479                 printk(KERN_WARNING "GPT:%lld != %lld\n",
 480                         (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
 481                         (unsigned long long)lastlba);
 482                 error_found++;
 483         }
 484
 485         if (le64_to_cpu(agpt->my_lba) != lastlba) {
 486                 printk(KERN_WARNING
 487                        "GPT:Alternate GPT header not at the end of the disk.\n");
 488                 printk(KERN_WARNING "GPT:%lld != %lld\n",
 489                         (unsigned long long)le64_to_cpu(agpt->my_lba),
 490                         (unsigned long long)lastlba);
 491                 error_found++;
 492         }
 493
 494         if (error_found)
 495                 printk(KERN_WARNING
 496                        "GPT: Use GNU Parted to correct GPT errors.\n");
 497         return;
 498 }
 499
 500 /**
 501  * find_valid_gpt() - Search disk for valid GPT headers and PTEs
 502  * @bdev
 503  * @gpt is a GPT header ptr, filled on return.
 504  * @ptes is a PTEs ptr, filled on return.
 505  * Description: Returns 1 if valid, 0 on error.
 506  * If valid, returns pointers to newly allocated GPT header and PTEs.
 507  * Validity depends on PMBR being valid (or being overridden by the
 508  * 'gpt' kernel command line option) and finding either the Primary
 509  * GPT header and PTEs valid, or the Alternate GPT header and PTEs
 510  * valid.  If the Primary GPT header is not valid, the Alternate GPT header
 511  * is not checked unless the 'gpt' kernel command line option is passed.
 512  * This protects against devices which misreport their size, and forces
 513  * the user to decide to use the Alternate GPT.
 514  */
 515 static int
 516 find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
 517 {
 518         int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
 519         gpt_header *pgpt = NULL, *agpt = NULL;
 520         gpt_entry *pptes = NULL, *aptes = NULL;
 521         legacy_mbr *legacymbr;
 522         u64 lastlba;
 523         if (!bdev || !gpt || !ptes)
 524                 return 0;
 525
 526         lastlba = last_lba(bdev);
 527         if (!force_gpt) {
 528                 /* This will be added to the EFI Spec. per Intel after v1.02. */
 529                 legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
 530                 if (legacymbr) {
 531                         read_lba(bdev, 0, (u8 *) legacymbr,
 532                                  sizeof (*legacymbr));
 533                         good_pmbr = is_pmbr_valid(legacymbr);
 534                         kfree(legacymbr);
 535                 }
 536                 if (!good_pmbr)
 537                         goto fail;
 538         }
 539
 540         good_pgpt = is_gpt_valid(bdev, GPT_PRIMARY_PARTITION_TABLE_LBA,
 541                                  &pgpt, &pptes);
 542         if (good_pgpt)
 543                 good_agpt = is_gpt_valid(bdev,
 544                                          le64_to_cpu(pgpt->alternate_lba),
 545                                          &agpt, &aptes);
 546         if (!good_agpt && force_gpt)
 547                 good_agpt = is_gpt_valid(bdev, lastlba,
 548                                          &agpt, &aptes);
 549
 550         /* The obviously unsuccessful case */
 551         if (!good_pgpt && !good_agpt)
 552                 goto fail;
 553
 554         compare_gpts(pgpt, agpt, lastlba);
 555
 556         /* The good cases */
 557         if (good_pgpt) {
 558                 *gpt  = pgpt;
 559                 *ptes = pptes;
 560                 kfree(agpt);
 561                 kfree(aptes);
 562                 if (!good_agpt) {
 563                         printk(KERN_WARNING
 564                                "Alternate GPT is invalid, "
 565                                "using primary GPT.\n");
 566                 }
 567                 return 1;
 568         }
 569         else if (good_agpt) {
 570                 *gpt  = agpt;
 571                 *ptes = aptes;
 572                 kfree(pgpt);
 573                 kfree(pptes);
 574                 printk(KERN_WARNING
 575                        "Primary GPT is invalid, using alternate GPT.\n");
 576                 return 1;
 577         }
 578
 579  fail:
 580         kfree(pgpt);
 581         kfree(agpt);
 582         kfree(pptes);
 583         kfree(aptes);
 584         *gpt = NULL;
 585         *ptes = NULL;
 586         return 0;
 587 }
 588
 589 /**
 590  * efi_partition(struct parsed_partitions *state, struct block_device *bdev)
 591  * @state
 592  * @bdev
 593  *
 594  * Description: called from check.c, if the disk contains GPT
 595  * partitions, sets up partition entries in the kernel.
 596  *
 597  * If the first block on the disk is a legacy MBR,
 598  * it will get handled by msdos_partition().
 599  * If it's a Protective MBR, we'll handle it here.
 600  *
 601  * We do not create a Linux partition for GPT, but
 602  * only for the actual data partitions.
 603  * Returns:
 604  * -1 if unable to read the partition table
 605  *  0 if this isn't our partition table
 606  *  1 if successful
 607  *
 608  */
 609 int
 610 efi_partition(struct parsed_partitions *state, struct block_device *bdev)
 611 {
 612         gpt_header *gpt = NULL;
 613         gpt_entry *ptes = NULL;
 614         u32 i;
 615         int n =(bdev_hardsect_size(bdev) >> 9);
 616
 617         if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) {
 618                 kfree(gpt);
 619                 kfree(ptes);
 620                 return 0;
 621         }
 622
 623         Dprintk("GUID Partition Table is valid!  Yea!\n");
 624
 625         for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
 626                 if (!is_pte_valid(&ptes[i], last_lba(bdev)))
 627                         continue;
 628
 629                 put_partition(state, i+1, le64_to_cpu(ptes[i].starting_lba)*n,
 630                                  (le64_to_cpu(ptes[i].ending_lba) -
 631                                   le64_to_cpu(ptes[i].starting_lba) +
 632                                   1ULL)*n);
 633
 634                 /* If this is a RAID volume, tell md */
 635                 if (!efi_guidcmp(ptes[i].partition_type_guid,
 636                                  PARTITION_LINUX_RAID_GUID))
 637                         state->parts[i+1].flags = 1;
 638         }
 639         kfree(ptes);
 640         kfree(gpt);
 641         printk("\n");
 642         return 1;
 643 }