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[net-next-2.6.git] / fs / partitions / efi.c
CommitLineData
1da177e4
LT		 1/************************************************************
2 * EFI GUID Partition Table handling
7d13af32
KZ		 3 *
4 * http://www.uefi.org/specs/
5 * http://www.intel.com/technology/efi/
6 *
1da177e4
LT		 7 * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
8 * Copyright 2000,2001,2002,2004 Dell Inc.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 *
24 *
25 * TODO:
26 *
27 * Changelog:
28 * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
29 * - test for valid PMBR and valid PGPT before ever reading
30 * AGPT, allow override with 'gpt' kernel command line option.
31 * - check for first/last_usable_lba outside of size of disk
32 *
33 * Tue Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
34 * - Ported to 2.5.7-pre1 and 2.5.7-dj2
35 * - Applied patch to avoid fault in alternate header handling
36 * - cleaned up find_valid_gpt
37 * - On-disk structure and copy in memory is *always* LE now -
38 * swab fields as needed
39 * - remove print_gpt_header()
40 * - only use first max_p partition entries, to keep the kernel minor number
41 * and partition numbers tied.
42 *
43 * Mon Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
44 * - Removed __PRIPTR_PREFIX - not being used
45 *
46 * Mon Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
47 * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
48 *
49 * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
50 * - Added compare_gpts().
51 * - moved le_efi_guid_to_cpus() back into this file. GPT is the only
52 * thing that keeps EFI GUIDs on disk.
53 * - Changed gpt structure names and members to be simpler and more Linux-like.
54 *
55 * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
56 * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
57 *
58 * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
59 * - Changed function comments to DocBook style per Andreas Dilger suggestion.
60 *
61 * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
62 * - Change read_lba() to use the page cache per Al Viro's work.
63 * - print u64s properly on all architectures
64 * - fixed debug_printk(), now Dprintk()
65 *
66 * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
67 * - Style cleanups
68 * - made most functions static
69 * - Endianness addition
70 * - remove test for second alternate header, as it's not per spec,
71 * and is unnecessary. There's now a method to read/write the last
72 * sector of an odd-sized disk from user space. No tools have ever
73 * been released which used this code, so it's effectively dead.
74 * - Per Asit Mallick of Intel, added a test for a valid PMBR.
75 * - Added kernel command line option 'gpt' to override valid PMBR test.
76 *
77 * Wed Jun 6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
78 * - added devfs volume UUID support (/dev/volumes/uuids) for
79 * mounting file systems by the partition GUID.
80 *
81 * Tue Dec 5 2000 Matt Domsch <Matt_Domsch@dell.com>
82 * - Moved crc32() to linux/lib, added efi_crc32().
83 *
84 * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
85 * - Replaced Intel's CRC32 function with an equivalent
86 * non-license-restricted version.
87 *
88 * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
89 * - Fixed the last_lba() call to return the proper last block
90 *
91 * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
92 * - Thanks to Andries Brouwer for his debugging assistance.
93 * - Code works, detects all the partitions.
94 *
95 ************************************************************/
1da177e4 96#include <linux/crc32.h>
7d13af32 97#include <linux/math64.h>
5a0e3ad6 98#include <linux/slab.h>
1da177e4
LT		 99#include "check.h"
100#include "efi.h"
101
1da177e4
LT		 102/* This allows a kernel command line option 'gpt' to override
103 * the test for invalid PMBR. Not __initdata because reloading
104 * the partition tables happens after init too.
105 */
106static int force_gpt;
107static int __init
108force_gpt_fn(char *str)
109{
110 force_gpt = 1;
111 return 1;
112}
113__setup("gpt", force_gpt_fn);
114
115
116/**
117 * efi_crc32() - EFI version of crc32 function
118 * @buf: buffer to calculate crc32 of
119 * @len - length of buf
120 *
121 * Description: Returns EFI-style CRC32 value for @buf
122 *
123 * This function uses the little endian Ethernet polynomial
124 * but seeds the function with ~0, and xor's with ~0 at the end.
125 * Note, the EFI Specification, v1.02, has a reference to
126 * Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
127 */
128static inline u32
129efi_crc32(const void *buf, unsigned long len)
130{
131 return (crc32(~0L, buf, len) ^ ~0L);
132}
133
134/**
135 * last_lba(): return number of last logical block of device
136 * @bdev: block device
137 *
138 * Description: Returns last LBA value on success, 0 on error.
139 * This is stored (by sd and ide-geometry) in
140 * the part[0] entry for this disk, and is the number of
141 * physical sectors available on the disk.
142 */
143static u64
144last_lba(struct block_device *bdev)
145{
146 if (!bdev || !bdev->bd_inode)
147 return 0;
7d13af32
KZ		 148 return div_u64(bdev->bd_inode->i_size,
149 bdev_logical_block_size(bdev)) - 1ULL;
1da177e4
LT		 150}
151
152static inline int
4c64c30a 153pmbr_part_valid(struct partition *part)
1da177e4
LT		 154{
155 if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT &&
156 le32_to_cpu(part->start_sect) == 1UL)
157 return 1;
158 return 0;
159}
160
161/**
162 * is_pmbr_valid(): test Protective MBR for validity
163 * @mbr: pointer to a legacy mbr structure
1da177e4
LT		 164 *
165 * Description: Returns 1 if PMBR is valid, 0 otherwise.
166 * Validity depends on two things:
167 * 1) MSDOS signature is in the last two bytes of the MBR
168 * 2) One partition of type 0xEE is found
169 */
170static int
4c64c30a 171is_pmbr_valid(legacy_mbr *mbr)
1da177e4
LT		 172{
173 int i;
174 if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE)
175 return 0;
176 for (i = 0; i < 4; i++)
4c64c30a 177 if (pmbr_part_valid(&mbr->partition_record[i]))
1da177e4
LT		 178 return 1;
179 return 0;
180}
181
182/**
183 * read_lba(): Read bytes from disk, starting at given LBA
184 * @bdev
185 * @lba
186 * @buffer
187 * @size_t
188 *
189 * Description: Reads @count bytes from @bdev into @buffer.
190 * Returns number of bytes read on success, 0 on error.
191 */
192static size_t
193read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count)
194{
195 size_t totalreadcount = 0;
7d13af32 196 sector_t n = lba * (bdev_logical_block_size(bdev) / 512);
1da177e4
LT		 197
198 if (!bdev || !buffer || lba > last_lba(bdev))
199 return 0;
200
201 while (count) {
202 int copied = 512;
203 Sector sect;
7d13af32 204 unsigned char *data = read_dev_sector(bdev, n++, &sect);
1da177e4
LT		 205 if (!data)
206 break;
207 if (copied > count)
208 copied = count;
209 memcpy(buffer, data, copied);
210 put_dev_sector(sect);
211 buffer += copied;
212 totalreadcount +=copied;
213 count -= copied;
214 }
215 return totalreadcount;
216}
217
218/**
219 * alloc_read_gpt_entries(): reads partition entries from disk
220 * @bdev
221 * @gpt - GPT header
222 *
223 * Description: Returns ptes on success, NULL on error.
224 * Allocates space for PTEs based on information found in @gpt.
225 * Notes: remember to free pte when you're done!
226 */
227static gpt_entry *
228alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt)
229{
230 size_t count;
231 gpt_entry *pte;
232 if (!bdev || !gpt)
233 return NULL;
234
235 count = le32_to_cpu(gpt->num_partition_entries) *
236 le32_to_cpu(gpt->sizeof_partition_entry);
237 if (!count)
238 return NULL;
f8314dc6 239 pte = kzalloc(count, GFP_KERNEL);
1da177e4
LT		 240 if (!pte)
241 return NULL;
1da177e4
LT		 242
243 if (read_lba(bdev, le64_to_cpu(gpt->partition_entry_lba),
244 (u8 *) pte,
245 count) < count) {
246 kfree(pte);
247 pte=NULL;
248 return NULL;
249 }
250 return pte;
251}
252
253/**
254 * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
255 * @bdev
256 * @lba is the Logical Block Address of the partition table
257 *
258 * Description: returns GPT header on success, NULL on error. Allocates
259 * and fills a GPT header starting at @ from @bdev.
260 * Note: remember to free gpt when finished with it.
261 */
262static gpt_header *
263alloc_read_gpt_header(struct block_device *bdev, u64 lba)
264{
265 gpt_header *gpt;
87038c2d
KZ		 266 unsigned ssz = bdev_logical_block_size(bdev);
267
1da177e4
LT		 268 if (!bdev)
269 return NULL;
270
87038c2d 271 gpt = kzalloc(ssz, GFP_KERNEL);
1da177e4
LT		 272 if (!gpt)
273 return NULL;
1da177e4 274
87038c2d 275 if (read_lba(bdev, lba, (u8 *) gpt, ssz) < ssz) {
1da177e4
LT		 276 kfree(gpt);
277 gpt=NULL;
278 return NULL;
279 }
280
281 return gpt;
282}
283
284/**
285 * is_gpt_valid() - tests one GPT header and PTEs for validity
286 * @bdev
287 * @lba is the logical block address of the GPT header to test
288 * @gpt is a GPT header ptr, filled on return.
289 * @ptes is a PTEs ptr, filled on return.
290 *
291 * Description: returns 1 if valid, 0 on error.
292 * If valid, returns pointers to newly allocated GPT header and PTEs.
293 */
294static int
295is_gpt_valid(struct block_device *bdev, u64 lba,
296 gpt_header **gpt, gpt_entry **ptes)
297{
298 u32 crc, origcrc;
299 u64 lastlba;
300
301 if (!bdev || !gpt || !ptes)
302 return 0;
303 if (!(*gpt = alloc_read_gpt_header(bdev, lba)))
304 return 0;
305
306 /* Check the GUID Partition Table signature */
307 if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) {
d9916962
TG		 308 pr_debug("GUID Partition Table Header signature is wrong:"
309 "%lld != %lld\n",
310 (unsigned long long)le64_to_cpu((*gpt)->signature),
311 (unsigned long long)GPT_HEADER_SIGNATURE);
1da177e4
LT		 312 goto fail;
313 }
314
315 /* Check the GUID Partition Table CRC */
316 origcrc = le32_to_cpu((*gpt)->header_crc32);
317 (*gpt)->header_crc32 = 0;
318 crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size));
319
320 if (crc != origcrc) {
d9916962
TG		 321 pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n",
322 crc, origcrc);
1da177e4
LT		 323 goto fail;
324 }
325 (*gpt)->header_crc32 = cpu_to_le32(origcrc);
326
327 /* Check that the my_lba entry points to the LBA that contains
328 * the GUID Partition Table */
329 if (le64_to_cpu((*gpt)->my_lba) != lba) {
d9916962
TG		 330 pr_debug("GPT my_lba incorrect: %lld != %lld\n",
331 (unsigned long long)le64_to_cpu((*gpt)->my_lba),
332 (unsigned long long)lba);
1da177e4
LT		 333 goto fail;
334 }
335
336 /* Check the first_usable_lba and last_usable_lba are
337 * within the disk.
338 */
339 lastlba = last_lba(bdev);
340 if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) {
d9916962
TG		 341 pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n",
342 (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba),
343 (unsigned long long)lastlba);
1da177e4
LT		 344 goto fail;
345 }
346 if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) {
d9916962
TG		 347 pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n",
348 (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba),
349 (unsigned long long)lastlba);
1da177e4
LT		 350 goto fail;
351 }
352
353 if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt)))
354 goto fail;
355
356 /* Check the GUID Partition Entry Array CRC */
357 crc = efi_crc32((const unsigned char *) (*ptes),
358 le32_to_cpu((*gpt)->num_partition_entries) *
359 le32_to_cpu((*gpt)->sizeof_partition_entry));
360
361 if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) {
d9916962 362 pr_debug("GUID Partitition Entry Array CRC check failed.\n");
1da177e4
LT		 363 goto fail_ptes;
364 }
365
366 /* We're done, all's well */
367 return 1;
368
369 fail_ptes:
370 kfree(*ptes);
371 *ptes = NULL;
372 fail:
373 kfree(*gpt);
374 *gpt = NULL;
375 return 0;
376}
377
378/**
379 * is_pte_valid() - tests one PTE for validity
380 * @pte is the pte to check
381 * @lastlba is last lba of the disk
382 *
383 * Description: returns 1 if valid, 0 on error.
384 */
385static inline int
386is_pte_valid(const gpt_entry *pte, const u64 lastlba)
387{
388 if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) ||
389 le64_to_cpu(pte->starting_lba) > lastlba ||
390 le64_to_cpu(pte->ending_lba) > lastlba)
391 return 0;
392 return 1;
393}
394
395/**
396 * compare_gpts() - Search disk for valid GPT headers and PTEs
397 * @pgpt is the primary GPT header
398 * @agpt is the alternate GPT header
399 * @lastlba is the last LBA number
400 * Description: Returns nothing. Sanity checks pgpt and agpt fields
401 * and prints warnings on discrepancies.
402 *
403 */
404static void
405compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba)
406{
407 int error_found = 0;
408 if (!pgpt || !agpt)
409 return;
410 if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) {
411 printk(KERN_WARNING
412 "GPT:Primary header LBA != Alt. header alternate_lba\n");
413 printk(KERN_WARNING "GPT:%lld != %lld\n",
414 (unsigned long long)le64_to_cpu(pgpt->my_lba),
415 (unsigned long long)le64_to_cpu(agpt->alternate_lba));
416 error_found++;
417 }
418 if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) {
419 printk(KERN_WARNING
420 "GPT:Primary header alternate_lba != Alt. header my_lba\n");
421 printk(KERN_WARNING "GPT:%lld != %lld\n",
422 (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
423 (unsigned long long)le64_to_cpu(agpt->my_lba));
424 error_found++;
425 }
426 if (le64_to_cpu(pgpt->first_usable_lba) !=
427 le64_to_cpu(agpt->first_usable_lba)) {
428 printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n");
429 printk(KERN_WARNING "GPT:%lld != %lld\n",
430 (unsigned long long)le64_to_cpu(pgpt->first_usable_lba),
431 (unsigned long long)le64_to_cpu(agpt->first_usable_lba));
432 error_found++;
433 }
434 if (le64_to_cpu(pgpt->last_usable_lba) !=
435 le64_to_cpu(agpt->last_usable_lba)) {
436 printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n");
437 printk(KERN_WARNING "GPT:%lld != %lld\n",
438 (unsigned long long)le64_to_cpu(pgpt->last_usable_lba),
439 (unsigned long long)le64_to_cpu(agpt->last_usable_lba));
440 error_found++;
441 }
442 if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) {
443 printk(KERN_WARNING "GPT:disk_guids don't match.\n");
444 error_found++;
445 }
446 if (le32_to_cpu(pgpt->num_partition_entries) !=
447 le32_to_cpu(agpt->num_partition_entries)) {
448 printk(KERN_WARNING "GPT:num_partition_entries don't match: "
449 "0x%x != 0x%x\n",
450 le32_to_cpu(pgpt->num_partition_entries),
451 le32_to_cpu(agpt->num_partition_entries));
452 error_found++;
453 }
454 if (le32_to_cpu(pgpt->sizeof_partition_entry) !=
455 le32_to_cpu(agpt->sizeof_partition_entry)) {
456 printk(KERN_WARNING
457 "GPT:sizeof_partition_entry values don't match: "
458 "0x%x != 0x%x\n",
459 le32_to_cpu(pgpt->sizeof_partition_entry),
460 le32_to_cpu(agpt->sizeof_partition_entry));
461 error_found++;
462 }
463 if (le32_to_cpu(pgpt->partition_entry_array_crc32) !=
464 le32_to_cpu(agpt->partition_entry_array_crc32)) {
465 printk(KERN_WARNING
466 "GPT:partition_entry_array_crc32 values don't match: "
467 "0x%x != 0x%x\n",
468 le32_to_cpu(pgpt->partition_entry_array_crc32),
469 le32_to_cpu(agpt->partition_entry_array_crc32));
470 error_found++;
471 }
472 if (le64_to_cpu(pgpt->alternate_lba) != lastlba) {
473 printk(KERN_WARNING
474 "GPT:Primary header thinks Alt. header is not at the end of the disk.\n");
475 printk(KERN_WARNING "GPT:%lld != %lld\n",
476 (unsigned long long)le64_to_cpu(pgpt->alternate_lba),
477 (unsigned long long)lastlba);
478 error_found++;
479 }
480
481 if (le64_to_cpu(agpt->my_lba) != lastlba) {
482 printk(KERN_WARNING
483 "GPT:Alternate GPT header not at the end of the disk.\n");
484 printk(KERN_WARNING "GPT:%lld != %lld\n",
485 (unsigned long long)le64_to_cpu(agpt->my_lba),
486 (unsigned long long)lastlba);
487 error_found++;
488 }
489
490 if (error_found)
491 printk(KERN_WARNING
492 "GPT: Use GNU Parted to correct GPT errors.\n");
493 return;
494}
495
496/**
497 * find_valid_gpt() - Search disk for valid GPT headers and PTEs
498 * @bdev
499 * @gpt is a GPT header ptr, filled on return.
500 * @ptes is a PTEs ptr, filled on return.
501 * Description: Returns 1 if valid, 0 on error.
502 * If valid, returns pointers to newly allocated GPT header and PTEs.
503 * Validity depends on PMBR being valid (or being overridden by the
504 * 'gpt' kernel command line option) and finding either the Primary
505 * GPT header and PTEs valid, or the Alternate GPT header and PTEs
506 * valid. If the Primary GPT header is not valid, the Alternate GPT header
507 * is not checked unless the 'gpt' kernel command line option is passed.
508 * This protects against devices which misreport their size, and forces
509 * the user to decide to use the Alternate GPT.
510 */
511static int
512find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes)
513{
514 int good_pgpt = 0, good_agpt = 0, good_pmbr = 0;
515 gpt_header *pgpt = NULL, *agpt = NULL;
516 gpt_entry *pptes = NULL, *aptes = NULL;
4c64c30a 517 legacy_mbr *legacymbr;
1da177e4
LT		 518 u64 lastlba;
519 if (!bdev || !gpt || !ptes)
520 return 0;
521
522 lastlba = last_lba(bdev);
523 if (!force_gpt) {
524 /* This will be added to the EFI Spec. per Intel after v1.02. */
f8314dc6 525 legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL);
1da177e4 526 if (legacymbr) {
1da177e4
LT		 527 read_lba(bdev, 0, (u8 *) legacymbr,
528 sizeof (*legacymbr));
4c64c30a 529 good_pmbr = is_pmbr_valid(legacymbr);
1da177e4 530 kfree(legacymbr);
1da177e4
LT		 531 }
532 if (!good_pmbr)
533 goto fail;
534 }
535
536 good_pgpt = is_gpt_valid(bdev, GPT_PRIMARY_PARTITION_TABLE_LBA,
537 &pgpt, &pptes);
538 if (good_pgpt)
539 good_agpt = is_gpt_valid(bdev,
540 le64_to_cpu(pgpt->alternate_lba),
541 &agpt, &aptes);
542 if (!good_agpt && force_gpt)
543 good_agpt = is_gpt_valid(bdev, lastlba,
544 &agpt, &aptes);
545
546 /* The obviously unsuccessful case */
547 if (!good_pgpt && !good_agpt)
548 goto fail;
549
550 compare_gpts(pgpt, agpt, lastlba);
551
552 /* The good cases */
553 if (good_pgpt) {
554 *gpt = pgpt;
555 *ptes = pptes;
556 kfree(agpt);
557 kfree(aptes);
558 if (!good_agpt) {
559 printk(KERN_WARNING
560 "Alternate GPT is invalid, "
561 "using primary GPT.\n");
562 }
563 return 1;
564 }
565 else if (good_agpt) {
566 *gpt = agpt;
567 *ptes = aptes;
568 kfree(pgpt);
569 kfree(pptes);
570 printk(KERN_WARNING
571 "Primary GPT is invalid, using alternate GPT.\n");
572 return 1;
573 }
574
575 fail:
576 kfree(pgpt);
577 kfree(agpt);
578 kfree(pptes);
579 kfree(aptes);
580 *gpt = NULL;
581 *ptes = NULL;
582 return 0;
583}
584
585/**
586 * efi_partition(struct parsed_partitions *state, struct block_device *bdev)
587 * @state
588 * @bdev
589 *
590 * Description: called from check.c, if the disk contains GPT
591 * partitions, sets up partition entries in the kernel.
592 *
593 * If the first block on the disk is a legacy MBR,
594 * it will get handled by msdos_partition().
595 * If it's a Protective MBR, we'll handle it here.
596 *
597 * We do not create a Linux partition for GPT, but
598 * only for the actual data partitions.
599 * Returns:
600 * -1 if unable to read the partition table
601 * 0 if this isn't our partition table
602 * 1 if successful
603 *
604 */
605int
606efi_partition(struct parsed_partitions *state, struct block_device *bdev)
607{
608 gpt_header *gpt = NULL;
609 gpt_entry *ptes = NULL;
610 u32 i;
7d13af32 611 unsigned ssz = bdev_logical_block_size(bdev) / 512;
1da177e4
LT		 612
613 if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) {
614 kfree(gpt);
615 kfree(ptes);
616 return 0;
617 }
618
d9916962 619 pr_debug("GUID Partition Table is valid! Yea!\n");
1da177e4
LT		 620
621 for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) {
7d13af32
KZ		 622 u64 start = le64_to_cpu(ptes[i].starting_lba);
623 u64 size = le64_to_cpu(ptes[i].ending_lba) -
624 le64_to_cpu(ptes[i].starting_lba) + 1ULL;
625
1da177e4
LT		 626 if (!is_pte_valid(&ptes[i], last_lba(bdev)))
627 continue;
628
7d13af32 629 put_partition(state, i+1, start * ssz, size * ssz);
1da177e4
LT		 630
631 /* If this is a RAID volume, tell md */
632 if (!efi_guidcmp(ptes[i].partition_type_guid,
633 PARTITION_LINUX_RAID_GUID))
634 state->parts[i+1].flags = 1;
635 }
636 kfree(ptes);
637 kfree(gpt);
638 printk("\n");
639 return 1;
640}
Clone of davem's net-next-2.6 tree