| /************************************************************ |
| * 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 Dell Computer Corporation |
| * |
| * 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: |
| * Wed Mar 27 2002 Matt Domsch <Matt_Domsch@dell.com> |
| * - Ported to 2.5.7-pre1 and 2.4.18 |
| * - 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. |
| * - 2.4.18 patch needs own crc32() function - there's no official |
| * lib/crc32.c in 2.4.x. |
| * |
| * 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/config.h> |
| #include <linux/fs.h> |
| #include <linux/genhd.h> |
| #include <linux/kernel.h> |
| #include <linux/major.h> |
| #include <linux/string.h> |
| #include <linux/blk.h> |
| #include <linux/blkpg.h> |
| #include <linux/slab.h> |
| #include <linux/smp_lock.h> |
| #include <linux/init.h> |
| #include <linux/crc32.h> |
| #include <asm/system.h> |
| #include <asm/byteorder.h> |
| #include "check.h" |
| #include "efi.h" |
| |
| #if CONFIG_BLK_DEV_MD |
| extern void md_autodetect_dev(kdev_t dev); |
| #endif |
| |
| /* Handle printing of 64-bit values */ |
| /* Borrowed from /usr/include/inttypes.h */ |
| # if BITS_PER_LONG == 64 |
| # define __PRI64_PREFIX "l" |
| # else |
| # define __PRI64_PREFIX "ll" |
| # endif |
| # define PRIx64 __PRI64_PREFIX "x" |
| |
| |
| #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); |
| } |
| |
| /** |
| * is_pmbr_valid(): test Protective MBR for validity |
| * @mbr: pointer to a legacy mbr structure |
| * |
| * 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) |
| { |
| int i, found = 0, signature = 0; |
| if (!mbr) |
| return 0; |
| signature = (le16_to_cpu(mbr->signature) == MSDOS_MBR_SIGNATURE); |
| for (i = 0; signature && i < 4; i++) { |
| if (mbr->partition_record[i].sys_ind == |
| EFI_PMBR_OSTYPE_EFI_GPT) { |
| found = 1; |
| break; |
| } |
| } |
| return (signature && found); |
| } |
| |
| /** |
| * last_lba(): return number of last logical block of device |
| * @hd: gendisk with partition list |
| * @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 gendisk *hd, struct block_device *bdev) |
| { |
| if (!hd || !hd->part || !bdev) |
| return 0; |
| return hd->part[MINOR(to_kdev_t(bdev->bd_dev))].nr_sects - 1; |
| } |
| |
| /** |
| * read_lba(): Read bytes from disk, starting at given LBA |
| * @hd |
| * @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 gendisk *hd, struct block_device *bdev, u64 lba, |
| u8 * buffer, size_t count) |
| { |
| |
| size_t totalreadcount = 0, bytesread = 0; |
| unsigned long blocksize; |
| int i; |
| Sector sect; |
| unsigned char *data = NULL; |
| |
| if (!hd || !bdev || !buffer || !count) |
| return 0; |
| |
| blocksize = get_hardsect_size(to_kdev_t(bdev->bd_dev)); |
| if (!blocksize) |
| blocksize = 512; |
| |
| for (i = 0; count > 0; i++) { |
| data = read_dev_sector(bdev, lba, §); |
| if (!data) |
| return totalreadcount; |
| |
| bytesread = |
| PAGE_CACHE_SIZE - (data - |
| (unsigned char *) page_address(sect.v)); |
| bytesread = min(bytesread, count); |
| memcpy(buffer, data, bytesread); |
| put_dev_sector(sect); |
| |
| buffer += bytesread; |
| totalreadcount += bytesread; |
| count -= bytesread; |
| lba += (bytesread / blocksize); |
| } |
| return totalreadcount; |
| } |
| |
| |
| /** |
| * alloc_read_gpt_entries(): reads partition entries from disk |
| * @hd |
| * @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 gendisk *hd, |
| struct block_device *bdev, gpt_header *gpt) |
| { |
| size_t count; |
| gpt_entry *pte; |
| if (!hd || !bdev || !gpt) |
| return NULL; |
| |
| count = le32_to_cpu(gpt->num_partition_entries) * |
| le32_to_cpu(gpt->sizeof_partition_entry); |
| if (!count) |
| return NULL; |
| pte = kmalloc(count, GFP_KERNEL); |
| if (!pte) |
| return NULL; |
| memset(pte, 0, count); |
| |
| if (read_lba(hd, 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 |
| * @hd |
| * @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 gendisk *hd, struct block_device *bdev, u64 lba) |
| { |
| gpt_header *gpt; |
| if (!hd || !bdev) |
| return NULL; |
| |
| gpt = kmalloc(sizeof (gpt_header), GFP_KERNEL); |
| if (!gpt) |
| return NULL; |
| memset(gpt, 0, sizeof (gpt_header)); |
| |
| if (read_lba(hd, 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 |
| * @hd |
| * @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 gendisk *hd, struct block_device *bdev, u64 lba, |
| gpt_header **gpt, gpt_entry **ptes) |
| { |
| u32 crc, origcrc; |
| |
| if (!hd || !bdev || !gpt || !ptes) |
| return 0; |
| if (!(*gpt = alloc_read_gpt_header(hd, 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: %" |
| PRIx64 " != %" PRIx64 "\n", le64_to_cpu((*gpt)->signature), |
| GPT_HEADER_SIGNATURE); |
| kfree(*gpt); |
| *gpt = NULL; |
| return 0; |
| } |
| |
| /* 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); |
| kfree(*gpt); |
| *gpt = NULL; |
| return 0; |
| } |
| (*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: %" PRIx64 " != %" PRIx64 "\n", |
| le64_to_cpu((*gpt)->my_lba), lba); |
| kfree(*gpt); |
| *gpt = NULL; |
| return 0; |
| } |
| |
| if (!(*ptes = alloc_read_gpt_entries(hd, bdev, *gpt))) { |
| kfree(*gpt); |
| *gpt = NULL; |
| return 0; |
| } |
| |
| /* 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"); |
| kfree(*gpt); |
| *gpt = NULL; |
| kfree(*ptes); |
| *ptes = NULL; |
| return 0; |
| } |
| |
| /* We're done, all's well */ |
| 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:%" PRIx64 " != %" PRIx64 "\n", |
| le64_to_cpu(pgpt->my_lba), |
| 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:%" PRIx64 " != %" PRIx64 "\n", |
| le64_to_cpu(pgpt->alternate_lba), |
| 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:%" PRIx64 " != %" PRIx64 "\n", |
| le64_to_cpu(pgpt->first_usable_lba), |
| 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:%" PRIx64 " != %" PRIx64 "\n", |
| le64_to_cpu(pgpt->last_usable_lba), |
| 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:%" PRIx64 " != %" PRIx64 "\n", |
| le64_to_cpu(pgpt->alternate_lba), 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:%" PRIx64 " != %" PRIx64 "\n", |
| le64_to_cpu(agpt->my_lba), 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 |
| * @hd |
| * @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 finding either the Primary GPT header and PTEs valid, |
| * or the Alternate GPT header and PTEs valid, and the PMBR valid. |
| */ |
| static int |
| find_valid_gpt(struct gendisk *hd, 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 (!hd || !bdev || !gpt || !ptes) |
| return 0; |
| |
| lastlba = last_lba(hd, bdev); |
| good_pgpt = is_gpt_valid(hd, bdev, GPT_PRIMARY_PARTITION_TABLE_LBA, |
| &pgpt, &pptes); |
| if (good_pgpt) { |
| good_agpt = is_gpt_valid(hd, bdev, |
| le64_to_cpu(pgpt->alternate_lba), |
| &agpt, &aptes); |
| if (!good_agpt) { |
| good_agpt = is_gpt_valid(hd, bdev, lastlba, |
| &agpt, &aptes); |
| } |
| } |
| else { |
| good_agpt = is_gpt_valid(hd, bdev, lastlba, |
| &agpt, &aptes); |
| } |
| |
| /* The obviously unsuccessful case */ |
| if (!good_pgpt && !good_agpt) { |
| goto fail; |
| } |
| |
| /* This will be added to the EFI Spec. per Intel after v1.02. */ |
| legacymbr = kmalloc(sizeof (*legacymbr), GFP_KERNEL); |
| if (legacymbr) { |
| memset(legacymbr, 0, sizeof (*legacymbr)); |
| read_lba(hd, bdev, 0, (u8 *) legacymbr, |
| sizeof (*legacymbr)); |
| good_pmbr = is_pmbr_valid(legacymbr); |
| kfree(legacymbr); |
| legacymbr=NULL; |
| } |
| |
| /* Failure due to bad PMBR */ |
| if ((good_pgpt || good_agpt) && !good_pmbr && !force_gpt) { |
| printk(KERN_WARNING |
| " Warning: Disk has a valid GPT signature " |
| "but invalid PMBR.\n"); |
| printk(KERN_WARNING |
| " Assuming this disk is *not* a GPT disk anymore.\n"); |
| printk(KERN_WARNING |
| " Use gpt kernel option to override. " |
| "Use GNU Parted to correct disk.\n"); |
| goto fail; |
| } |
| |
| /* Would fail due to bad PMBR, but force GPT anyhow */ |
| if ((good_pgpt || good_agpt) && !good_pmbr && force_gpt) { |
| printk(KERN_WARNING |
| " Warning: Disk has a valid GPT signature but " |
| "invalid PMBR.\n"); |
| printk(KERN_WARNING |
| " Use GNU Parted to correct disk.\n"); |
| printk(KERN_WARNING |
| " gpt option taken, disk treated as GPT.\n"); |
| } |
| |
| compare_gpts(pgpt, agpt, lastlba); |
| |
| /* The good cases */ |
| if (good_pgpt && (good_pmbr || force_gpt)) { |
| *gpt = pgpt; |
| *ptes = pptes; |
| if (agpt) { kfree(agpt); agpt = NULL; } |
| if (aptes) { kfree(aptes); aptes = NULL; } |
| if (!good_agpt) { |
| printk(KERN_WARNING |
| "Alternate GPT is invalid, " |
| "using primary GPT.\n"); |
| } |
| return 1; |
| } |
| else if (good_agpt && (good_pmbr || force_gpt)) { |
| *gpt = agpt; |
| *ptes = aptes; |
| if (pgpt) { kfree(pgpt); pgpt = NULL; } |
| if (pptes) { kfree(pptes); pptes = NULL; } |
| printk(KERN_WARNING |
| "Primary GPT is invalid, using alternate GPT.\n"); |
| return 1; |
| } |
| |
| fail: |
| if (pgpt) { kfree(pgpt); pgpt=NULL; } |
| if (agpt) { kfree(agpt); agpt=NULL; } |
| if (pptes) { kfree(pptes); pptes=NULL; } |
| if (aptes) { kfree(aptes); aptes=NULL; } |
| *gpt = NULL; |
| *ptes = NULL; |
| return 0; |
| } |
| |
| /** |
| * add_gpt_partitions(struct gendisk *hd, struct block_device *bdev, |
| * @hd |
| * @bdev |
| * |
| * Description: Create devices for each entry in the GUID Partition Table |
| * Entries. |
| * |
| * 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 |
| * |
| */ |
| static int |
| add_gpt_partitions(struct gendisk *hd, struct block_device *bdev, int nextminor) |
| { |
| gpt_header *gpt = NULL; |
| gpt_entry *ptes = NULL; |
| u32 i; |
| int max_p; |
| |
| if (!hd || !bdev) |
| return -1; |
| |
| if (!find_valid_gpt(hd, bdev, &gpt, &ptes) || !gpt || !ptes) { |
| if (gpt) { |
| kfree(gpt); |
| gpt = NULL; |
| } |
| if (ptes) { |
| kfree(ptes); |
| ptes = NULL; |
| } |
| return 0; |
| } |
| |
| Dprintk("GUID Partition Table is valid! Yea!\n"); |
| |
| max_p = (1 << hd->minor_shift) - 1; |
| for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < max_p; i++) { |
| if (!efi_guidcmp(ptes[i].partition_type_guid, NULL_GUID)) |
| continue; |
| |
| add_gd_partition(hd, nextminor+i, |
| le64_to_cpu(ptes[i].starting_lba), |
| (le64_to_cpu(ptes[i].ending_lba) - |
| le64_to_cpu(ptes[i].starting_lba) + |
| 1)); |
| |
| /* If there's this is a RAID volume, tell md */ |
| #if CONFIG_BLK_DEV_MD |
| if (!efi_guidcmp(ptes[i].partition_type_guid, |
| PARTITION_LINUX_RAID_GUID)) { |
| md_autodetect_dev(MKDEV |
| (MAJOR(to_kdev_t(bdev->bd_dev)), |
| nextminor+i)); |
| } |
| #endif |
| } |
| kfree(ptes); |
| ptes=NULL; |
| kfree(gpt); |
| gpt=NULL; |
| printk("\n"); |
| return 1; |
| } |
| |
| /** |
| * efi_partition(): EFI GPT partition handling entry function |
| * @hd |
| * @bdev |
| * @first_sector: unused |
| * @first_part_minor: minor number assigned to first GPT partition found |
| * |
| * 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. |
| * |
| * set_blocksize() calls are necessary to be able to read |
| * a disk with an odd number of 512-byte sectors, as the |
| * default BLOCK_SIZE of 1024 bytes won't let that last |
| * sector be read otherwise. |
| * |
| * Returns: |
| * -1 if unable to read the partition table |
| * 0 if this isn't our partitoin table |
| * 1 if successful |
| */ |
| int |
| efi_partition(struct gendisk *hd, struct block_device *bdev, |
| unsigned long first_sector, int first_part_minor) |
| { |
| |
| kdev_t dev = to_kdev_t(bdev->bd_dev); |
| int hardblocksize = get_hardsect_size(dev); |
| int orig_blksize_size = BLOCK_SIZE; |
| int rc = 0; |
| |
| /* Need to change the block size that the block layer uses */ |
| if (blksize_size[MAJOR(dev)]) { |
| orig_blksize_size = blksize_size[MAJOR(dev)][MINOR(dev)]; |
| } |
| |
| if (orig_blksize_size != hardblocksize) |
| set_blocksize(dev, hardblocksize); |
| |
| rc = add_gpt_partitions(hd, bdev, first_part_minor); |
| |
| /* change back */ |
| if (orig_blksize_size != hardblocksize) |
| set_blocksize(dev, orig_blksize_size); |
| |
| return rc; |
| } |