| /************************************************************ | |
| * EFI GUID Partition Table handling | |
| * Per Intel EFI Specification v1.02 | |
| * http://developer.intel.com/technology/efi/efi.htm | |
| * efi.[ch] by Matt Domsch <Matt_Domsch@dell.com> | |
| * Copyright 2000,2001,2002,2004 Dell Inc. | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU General Public License as published by | |
| * the Free Software Foundation; either version 2 of the License, or | |
| * (at your option) any later version. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU General Public License for more details. | |
| * | |
| * You should have received a copy of the GNU General Public License | |
| * along with this program; if not, write to the Free Software | |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| * | |
| * | |
| * TODO: | |
| * | |
| * Changelog: | |
| * Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com> | |
| * - test for valid PMBR and valid PGPT before ever reading | |
| * AGPT, allow override with 'gpt' kernel command line option. | |
| * - check for first/last_usable_lba outside of size of disk | |
| * | |
| * Tue Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Ported to 2.5.7-pre1 and 2.5.7-dj2 | |
| * - Applied patch to avoid fault in alternate header handling | |
| * - cleaned up find_valid_gpt | |
| * - On-disk structure and copy in memory is *always* LE now - | |
| * swab fields as needed | |
| * - remove print_gpt_header() | |
| * - only use first max_p partition entries, to keep the kernel minor number | |
| * and partition numbers tied. | |
| * | |
| * Mon Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Removed __PRIPTR_PREFIX - not being used | |
| * | |
| * Mon Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Ported to 2.5.2-pre11 + library crc32 patch Linus applied | |
| * | |
| * Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Added compare_gpts(). | |
| * - moved le_efi_guid_to_cpus() back into this file. GPT is the only | |
| * thing that keeps EFI GUIDs on disk. | |
| * - Changed gpt structure names and members to be simpler and more Linux-like. | |
| * | |
| * Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck | |
| * | |
| * Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Changed function comments to DocBook style per Andreas Dilger suggestion. | |
| * | |
| * Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Change read_lba() to use the page cache per Al Viro's work. | |
| * - print u64s properly on all architectures | |
| * - fixed debug_printk(), now Dprintk() | |
| * | |
| * Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Style cleanups | |
| * - made most functions static | |
| * - Endianness addition | |
| * - remove test for second alternate header, as it's not per spec, | |
| * and is unnecessary. There's now a method to read/write the last | |
| * sector of an odd-sized disk from user space. No tools have ever | |
| * been released which used this code, so it's effectively dead. | |
| * - Per Asit Mallick of Intel, added a test for a valid PMBR. | |
| * - Added kernel command line option 'gpt' to override valid PMBR test. | |
| * | |
| * Wed Jun 6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com> | |
| * - added devfs volume UUID support (/dev/volumes/uuids) for | |
| * mounting file systems by the partition GUID. | |
| * | |
| * Tue Dec 5 2000 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Moved crc32() to linux/lib, added efi_crc32(). | |
| * | |
| * Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Replaced Intel's CRC32 function with an equivalent | |
| * non-license-restricted version. | |
| * | |
| * Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Fixed the last_lba() call to return the proper last block | |
| * | |
| * Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com> | |
| * - Thanks to Andries Brouwer for his debugging assistance. | |
| * - Code works, detects all the partitions. | |
| * | |
| ************************************************************/ | |
| #include <linux/crc32.h> | |
| #include "check.h" | |
| #include "efi.h" | |
| #undef EFI_DEBUG | |
| #ifdef EFI_DEBUG | |
| #define Dprintk(x...) printk(KERN_DEBUG x) | |
| #else | |
| #define Dprintk(x...) | |
| #endif | |
| /* This allows a kernel command line option 'gpt' to override | |
| * the test for invalid PMBR. Not __initdata because reloading | |
| * the partition tables happens after init too. | |
| */ | |
| static int force_gpt; | |
| static int __init | |
| force_gpt_fn(char *str) | |
| { | |
| force_gpt = 1; | |
| return 1; | |
| } | |
| __setup("gpt", force_gpt_fn); | |
| /** | |
| * efi_crc32() - EFI version of crc32 function | |
| * @buf: buffer to calculate crc32 of | |
| * @len - length of buf | |
| * | |
| * Description: Returns EFI-style CRC32 value for @buf | |
| * | |
| * This function uses the little endian Ethernet polynomial | |
| * but seeds the function with ~0, and xor's with ~0 at the end. | |
| * Note, the EFI Specification, v1.02, has a reference to | |
| * Dr. Dobbs Journal, May 1994 (actually it's in May 1992). | |
| */ | |
| static inline u32 | |
| efi_crc32(const void *buf, unsigned long len) | |
| { | |
| return (crc32(~0L, buf, len) ^ ~0L); | |
| } | |
| /** | |
| * last_lba(): return number of last logical block of device | |
| * @bdev: block device | |
| * | |
| * Description: Returns last LBA value on success, 0 on error. | |
| * This is stored (by sd and ide-geometry) in | |
| * the part[0] entry for this disk, and is the number of | |
| * physical sectors available on the disk. | |
| */ | |
| static u64 | |
| last_lba(struct block_device *bdev) | |
| { | |
| if (!bdev || !bdev->bd_inode) | |
| return 0; | |
| return (bdev->bd_inode->i_size >> 9) - 1ULL; | |
| } | |
| static inline int | |
| pmbr_part_valid(struct partition *part, u64 lastlba) | |
| { | |
| if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && | |
| le32_to_cpu(part->start_sect) == 1UL) | |
| return 1; | |
| return 0; | |
| } | |
| /** | |
| * is_pmbr_valid(): test Protective MBR for validity | |
| * @mbr: pointer to a legacy mbr structure | |
| * @lastlba: last_lba for the whole device | |
| * | |
| * Description: Returns 1 if PMBR is valid, 0 otherwise. | |
| * Validity depends on two things: | |
| * 1) MSDOS signature is in the last two bytes of the MBR | |
| * 2) One partition of type 0xEE is found | |
| */ | |
| static int | |
| is_pmbr_valid(legacy_mbr *mbr, u64 lastlba) | |
| { | |
| int i; | |
| if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) | |
| return 0; | |
| for (i = 0; i < 4; i++) | |
| if (pmbr_part_valid(&mbr->partition_record[i], lastlba)) | |
| return 1; | |
| return 0; | |
| } | |
| /** | |
| * read_lba(): Read bytes from disk, starting at given LBA | |
| * @bdev | |
| * @lba | |
| * @buffer | |
| * @size_t | |
| * | |
| * Description: Reads @count bytes from @bdev into @buffer. | |
| * Returns number of bytes read on success, 0 on error. | |
| */ | |
| static size_t | |
| read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count) | |
| { | |
| size_t totalreadcount = 0; | |
| if (!bdev || !buffer || lba > last_lba(bdev)) | |
| return 0; | |
| while (count) { | |
| int copied = 512; | |
| Sector sect; | |
| unsigned char *data = read_dev_sector(bdev, lba++, §); | |
| if (!data) | |
| break; | |
| if (copied > count) | |
| copied = count; | |
| memcpy(buffer, data, copied); | |
| put_dev_sector(sect); | |
| buffer += copied; | |
| totalreadcount +=copied; | |
| count -= copied; | |
| } | |
| return totalreadcount; | |
| } | |
| /** | |
| * alloc_read_gpt_entries(): reads partition entries from disk | |
| * @bdev | |
| * @gpt - GPT header | |
| * | |
| * Description: Returns ptes on success, NULL on error. | |
| * Allocates space for PTEs based on information found in @gpt. | |
| * Notes: remember to free pte when you're done! | |
| */ | |
| static gpt_entry * | |
| alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt) | |
| { | |
| size_t count; | |
| gpt_entry *pte; | |
| if (!bdev || !gpt) | |
| return NULL; | |
| count = le32_to_cpu(gpt->num_partition_entries) * | |
| le32_to_cpu(gpt->sizeof_partition_entry); | |
| if (!count) | |
| return NULL; | |
| pte = kzalloc(count, GFP_KERNEL); | |
| if (!pte) | |
| return NULL; | |
| if (read_lba(bdev, le64_to_cpu(gpt->partition_entry_lba), | |
| (u8 *) pte, | |
| count) < count) { | |
| kfree(pte); | |
| pte=NULL; | |
| return NULL; | |
| } | |
| return pte; | |
| } | |
| /** | |
| * alloc_read_gpt_header(): Allocates GPT header, reads into it from disk | |
| * @bdev | |
| * @lba is the Logical Block Address of the partition table | |
| * | |
| * Description: returns GPT header on success, NULL on error. Allocates | |
| * and fills a GPT header starting at @ from @bdev. | |
| * Note: remember to free gpt when finished with it. | |
| */ | |
| static gpt_header * | |
| alloc_read_gpt_header(struct block_device *bdev, u64 lba) | |
| { | |
| gpt_header *gpt; | |
| if (!bdev) | |
| return NULL; | |
| gpt = kzalloc(sizeof (gpt_header), GFP_KERNEL); | |
| if (!gpt) | |
| return NULL; | |
| if (read_lba(bdev, lba, (u8 *) gpt, | |
| sizeof (gpt_header)) < sizeof (gpt_header)) { | |
| kfree(gpt); | |
| gpt=NULL; | |
| return NULL; | |
| } | |
| return gpt; | |
| } | |
| /** | |
| * is_gpt_valid() - tests one GPT header and PTEs for validity | |
| * @bdev | |
| * @lba is the logical block address of the GPT header to test | |
| * @gpt is a GPT header ptr, filled on return. | |
| * @ptes is a PTEs ptr, filled on return. | |
| * | |
| * Description: returns 1 if valid, 0 on error. | |
| * If valid, returns pointers to newly allocated GPT header and PTEs. | |
| */ | |
| static int | |
| is_gpt_valid(struct block_device *bdev, u64 lba, | |
| gpt_header **gpt, gpt_entry **ptes) | |
| { | |
| u32 crc, origcrc; | |
| u64 lastlba; | |
| if (!bdev || !gpt || !ptes) | |
| return 0; | |
| if (!(*gpt = alloc_read_gpt_header(bdev, lba))) | |
| return 0; | |
| /* Check the GUID Partition Table signature */ | |
| if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) { | |
| Dprintk("GUID Partition Table Header signature is wrong:" | |
| "%lld != %lld\n", | |
| (unsigned long long)le64_to_cpu((*gpt)->signature), | |
| (unsigned long long)GPT_HEADER_SIGNATURE); | |
| goto fail; | |
| } | |
| /* Check the GUID Partition Table CRC */ | |
| origcrc = le32_to_cpu((*gpt)->header_crc32); | |
| (*gpt)->header_crc32 = 0; | |
| crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size)); | |
| if (crc != origcrc) { | |
| Dprintk | |
| ("GUID Partition Table Header CRC is wrong: %x != %x\n", | |
| crc, origcrc); | |
| goto fail; | |
| } | |
| (*gpt)->header_crc32 = cpu_to_le32(origcrc); | |
| /* Check that the my_lba entry points to the LBA that contains | |
| * the GUID Partition Table */ | |
| if (le64_to_cpu((*gpt)->my_lba) != lba) { | |
| Dprintk("GPT my_lba incorrect: %lld != %lld\n", | |
| (unsigned long long)le64_to_cpu((*gpt)->my_lba), | |
| (unsigned long long)lba); | |
| goto fail; | |
| } | |
| /* Check the first_usable_lba and last_usable_lba are | |
| * within the disk. | |
| */ | |
| lastlba = last_lba(bdev); | |
| if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) { | |
| Dprintk("GPT: first_usable_lba incorrect: %lld > %lld\n", | |
| (unsigned long long)le64_to_cpu((*gpt)->first_usable_lba), | |
| (unsigned long long)lastlba); | |
| goto fail; | |
| } | |
| if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) { | |
| Dprintk("GPT: last_usable_lba incorrect: %lld > %lld\n", | |
| (unsigned long long)le64_to_cpu((*gpt)->last_usable_lba), | |
| (unsigned long long)lastlba); | |
| goto fail; | |
| } | |
| if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt))) | |
| goto fail; | |
| /* Check the GUID Partition Entry Array CRC */ | |
| crc = efi_crc32((const unsigned char *) (*ptes), | |
| le32_to_cpu((*gpt)->num_partition_entries) * | |
| le32_to_cpu((*gpt)->sizeof_partition_entry)); | |
| if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) { | |
| Dprintk("GUID Partitition Entry Array CRC check failed.\n"); | |
| goto fail_ptes; | |
| } | |
| /* We're done, all's well */ | |
| return 1; | |
| fail_ptes: | |
| kfree(*ptes); | |
| *ptes = NULL; | |
| fail: | |
| kfree(*gpt); | |
| *gpt = NULL; | |
| return 0; | |
| } | |
| /** | |
| * is_pte_valid() - tests one PTE for validity | |
| * @pte is the pte to check | |
| * @lastlba is last lba of the disk | |
| * | |
| * Description: returns 1 if valid, 0 on error. | |
| */ | |
| static inline int | |
| is_pte_valid(const gpt_entry *pte, const u64 lastlba) | |
| { | |
| if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) || | |
| le64_to_cpu(pte->starting_lba) > lastlba || | |
| le64_to_cpu(pte->ending_lba) > lastlba) | |
| return 0; | |
| return 1; | |
| } | |
| /** | |
| * compare_gpts() - Search disk for valid GPT headers and PTEs | |
| * @pgpt is the primary GPT header | |
| * @agpt is the alternate GPT header | |
| * @lastlba is the last LBA number | |
| * Description: Returns nothing. Sanity checks pgpt and agpt fields | |
| * and prints warnings on discrepancies. | |
| * | |
| */ | |
| static void | |
| compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba) | |
| { | |
| int error_found = 0; | |
| if (!pgpt || !agpt) | |
| return; | |
| if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) { | |
| printk(KERN_WARNING | |
| "GPT:Primary header LBA != Alt. header alternate_lba\n"); | |
| printk(KERN_WARNING "GPT:%lld != %lld\n", | |
| (unsigned long long)le64_to_cpu(pgpt->my_lba), | |
| (unsigned long long)le64_to_cpu(agpt->alternate_lba)); | |
| error_found++; | |
| } | |
| if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) { | |
| printk(KERN_WARNING | |
| "GPT:Primary header alternate_lba != Alt. header my_lba\n"); | |
| printk(KERN_WARNING "GPT:%lld != %lld\n", | |
| (unsigned long long)le64_to_cpu(pgpt->alternate_lba), | |
| (unsigned long long)le64_to_cpu(agpt->my_lba)); | |
| error_found++; | |
| } | |
| if (le64_to_cpu(pgpt->first_usable_lba) != | |
| le64_to_cpu(agpt->first_usable_lba)) { | |
| printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n"); | |
| printk(KERN_WARNING "GPT:%lld != %lld\n", | |
| (unsigned long long)le64_to_cpu(pgpt->first_usable_lba), | |
| (unsigned long long)le64_to_cpu(agpt->first_usable_lba)); | |
| error_found++; | |
| } | |
| if (le64_to_cpu(pgpt->last_usable_lba) != | |
| le64_to_cpu(agpt->last_usable_lba)) { | |
| printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n"); | |
| printk(KERN_WARNING "GPT:%lld != %lld\n", | |
| (unsigned long long)le64_to_cpu(pgpt->last_usable_lba), | |
| (unsigned long long)le64_to_cpu(agpt->last_usable_lba)); | |
| error_found++; | |
| } | |
| if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) { | |
| printk(KERN_WARNING "GPT:disk_guids don't match.\n"); | |
| error_found++; | |
| } | |
| if (le32_to_cpu(pgpt->num_partition_entries) != | |
| le32_to_cpu(agpt->num_partition_entries)) { | |
| printk(KERN_WARNING "GPT:num_partition_entries don't match: " | |
| "0x%x != 0x%x\n", | |
| le32_to_cpu(pgpt->num_partition_entries), | |
| le32_to_cpu(agpt->num_partition_entries)); | |
| error_found++; | |
| } | |
| if (le32_to_cpu(pgpt->sizeof_partition_entry) != | |
| le32_to_cpu(agpt->sizeof_partition_entry)) { | |
| printk(KERN_WARNING | |
| "GPT:sizeof_partition_entry values don't match: " | |
| "0x%x != 0x%x\n", | |
| le32_to_cpu(pgpt->sizeof_partition_entry), | |
| le32_to_cpu(agpt->sizeof_partition_entry)); | |
| error_found++; | |
| } | |
| if (le32_to_cpu(pgpt->partition_entry_array_crc32) != | |
| le32_to_cpu(agpt->partition_entry_array_crc32)) { | |
| printk(KERN_WARNING | |
| "GPT:partition_entry_array_crc32 values don't match: " | |
| "0x%x != 0x%x\n", | |
| le32_to_cpu(pgpt->partition_entry_array_crc32), | |
| le32_to_cpu(agpt->partition_entry_array_crc32)); | |
| error_found++; | |
| } | |
| if (le64_to_cpu(pgpt->alternate_lba) != lastlba) { | |
| printk(KERN_WARNING | |
| "GPT:Primary header thinks Alt. header is not at the end of the disk.\n"); | |
| printk(KERN_WARNING "GPT:%lld != %lld\n", | |
| (unsigned long long)le64_to_cpu(pgpt->alternate_lba), | |
| (unsigned long long)lastlba); | |
| error_found++; | |
| } | |
| if (le64_to_cpu(agpt->my_lba) != lastlba) { | |
| printk(KERN_WARNING | |
| "GPT:Alternate GPT header not at the end of the disk.\n"); | |
| printk(KERN_WARNING "GPT:%lld != %lld\n", | |
| (unsigned long long)le64_to_cpu(agpt->my_lba), | |
| (unsigned long long)lastlba); | |
| error_found++; | |
| } | |
| if (error_found) | |
| printk(KERN_WARNING | |
| "GPT: Use GNU Parted to correct GPT errors.\n"); | |
| return; | |
| } | |
| /** | |
| * find_valid_gpt() - Search disk for valid GPT headers and PTEs | |
| * @bdev | |
| * @gpt is a GPT header ptr, filled on return. | |
| * @ptes is a PTEs ptr, filled on return. | |
| * Description: Returns 1 if valid, 0 on error. | |
| * If valid, returns pointers to newly allocated GPT header and PTEs. | |
| * Validity depends on PMBR being valid (or being overridden by the | |
| * 'gpt' kernel command line option) and finding either the Primary | |
| * GPT header and PTEs valid, or the Alternate GPT header and PTEs | |
| * valid. If the Primary GPT header is not valid, the Alternate GPT header | |
| * is not checked unless the 'gpt' kernel command line option is passed. | |
| * This protects against devices which misreport their size, and forces | |
| * the user to decide to use the Alternate GPT. | |
| */ | |
| static int | |
| find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes) | |
| { | |
| int good_pgpt = 0, good_agpt = 0, good_pmbr = 0; | |
| gpt_header *pgpt = NULL, *agpt = NULL; | |
| gpt_entry *pptes = NULL, *aptes = NULL; | |
| legacy_mbr *legacymbr = NULL; | |
| u64 lastlba; | |
| if (!bdev || !gpt || !ptes) | |
| return 0; | |
| lastlba = last_lba(bdev); | |
| if (!force_gpt) { | |
| /* This will be added to the EFI Spec. per Intel after v1.02. */ | |
| legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL); | |
| if (legacymbr) { | |
| read_lba(bdev, 0, (u8 *) legacymbr, | |
| sizeof (*legacymbr)); | |
| good_pmbr = is_pmbr_valid(legacymbr, lastlba); | |
| kfree(legacymbr); | |
| legacymbr=NULL; | |
| } | |
| if (!good_pmbr) | |
| goto fail; | |
| } | |
| good_pgpt = is_gpt_valid(bdev, GPT_PRIMARY_PARTITION_TABLE_LBA, | |
| &pgpt, &pptes); | |
| if (good_pgpt) | |
| good_agpt = is_gpt_valid(bdev, | |
| le64_to_cpu(pgpt->alternate_lba), | |
| &agpt, &aptes); | |
| if (!good_agpt && force_gpt) | |
| good_agpt = is_gpt_valid(bdev, lastlba, | |
| &agpt, &aptes); | |
| /* The obviously unsuccessful case */ | |
| if (!good_pgpt && !good_agpt) | |
| goto fail; | |
| compare_gpts(pgpt, agpt, lastlba); | |
| /* The good cases */ | |
| if (good_pgpt) { | |
| *gpt = pgpt; | |
| *ptes = pptes; | |
| kfree(agpt); | |
| kfree(aptes); | |
| if (!good_agpt) { | |
| printk(KERN_WARNING | |
| "Alternate GPT is invalid, " | |
| "using primary GPT.\n"); | |
| } | |
| return 1; | |
| } | |
| else if (good_agpt) { | |
| *gpt = agpt; | |
| *ptes = aptes; | |
| kfree(pgpt); | |
| kfree(pptes); | |
| printk(KERN_WARNING | |
| "Primary GPT is invalid, using alternate GPT.\n"); | |
| return 1; | |
| } | |
| fail: | |
| kfree(pgpt); | |
| kfree(agpt); | |
| kfree(pptes); | |
| kfree(aptes); | |
| *gpt = NULL; | |
| *ptes = NULL; | |
| return 0; | |
| } | |
| /** | |
| * efi_partition(struct parsed_partitions *state, struct block_device *bdev) | |
| * @state | |
| * @bdev | |
| * | |
| * Description: called from check.c, if the disk contains GPT | |
| * partitions, sets up partition entries in the kernel. | |
| * | |
| * If the first block on the disk is a legacy MBR, | |
| * it will get handled by msdos_partition(). | |
| * If it's a Protective MBR, we'll handle it here. | |
| * | |
| * We do not create a Linux partition for GPT, but | |
| * only for the actual data partitions. | |
| * Returns: | |
| * -1 if unable to read the partition table | |
| * 0 if this isn't our partition table | |
| * 1 if successful | |
| * | |
| */ | |
| int | |
| efi_partition(struct parsed_partitions *state, struct block_device *bdev) | |
| { | |
| gpt_header *gpt = NULL; | |
| gpt_entry *ptes = NULL; | |
| u32 i; | |
| if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) { | |
| kfree(gpt); | |
| kfree(ptes); | |
| return 0; | |
| } | |
| Dprintk("GUID Partition Table is valid! Yea!\n"); | |
| for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { | |
| if (!is_pte_valid(&ptes[i], last_lba(bdev))) | |
| continue; | |
| put_partition(state, i+1, le64_to_cpu(ptes[i].starting_lba), | |
| (le64_to_cpu(ptes[i].ending_lba) - | |
| le64_to_cpu(ptes[i].starting_lba) + | |
| 1ULL)); | |
| /* If this is a RAID volume, tell md */ | |
| if (!efi_guidcmp(ptes[i].partition_type_guid, | |
| PARTITION_LINUX_RAID_GUID)) | |
| state->parts[i+1].flags = 1; | |
| } | |
| kfree(ptes); | |
| kfree(gpt); | |
| printk("\n"); | |
| return 1; | |
| } |