1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
1 |
/************************************************************
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2 |
* EFI GUID Partition Table handling
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|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
3 |
*
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4 |
* http://www.uefi.org/specs/
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5 |
* http://www.intel.com/technology/efi/
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6 |
*
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1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
7 |
* efi.[ch] by Matt Domsch <Matt_Domsch@dell.com>
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8 |
* Copyright 2000,2001,2002,2004 Dell Inc.
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9 |
*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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19 |
*
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20 |
* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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22 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*
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* TODO:
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26 |
*
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27 |
* Changelog:
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28 |
* Mon Nov 09 2004 Matt Domsch <Matt_Domsch@dell.com>
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29 |
* - test for valid PMBR and valid PGPT before ever reading
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30 |
* AGPT, allow override with 'gpt' kernel command line option.
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* - check for first/last_usable_lba outside of size of disk
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*
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33 |
* Tue Mar 26 2002 Matt Domsch <Matt_Domsch@dell.com>
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34 |
* - Ported to 2.5.7-pre1 and 2.5.7-dj2
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35 |
* - Applied patch to avoid fault in alternate header handling
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36 |
* - cleaned up find_valid_gpt
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37 |
* - On-disk structure and copy in memory is *always* LE now -
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* swab fields as needed
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39 |
* - remove print_gpt_header()
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40 |
* - only use first max_p partition entries, to keep the kernel minor number
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* and partition numbers tied.
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42 |
*
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43 |
* Mon Feb 04 2002 Matt Domsch <Matt_Domsch@dell.com>
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44 |
* - Removed __PRIPTR_PREFIX - not being used
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*
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46 |
* Mon Jan 14 2002 Matt Domsch <Matt_Domsch@dell.com>
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47 |
* - Ported to 2.5.2-pre11 + library crc32 patch Linus applied
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48 |
*
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* Thu Dec 6 2001 Matt Domsch <Matt_Domsch@dell.com>
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50 |
* - Added compare_gpts().
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51 |
* - moved le_efi_guid_to_cpus() back into this file. GPT is the only
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52 |
* thing that keeps EFI GUIDs on disk.
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53 |
* - Changed gpt structure names and members to be simpler and more Linux-like.
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54 |
*
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55 |
* Wed Oct 17 2001 Matt Domsch <Matt_Domsch@dell.com>
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56 |
* - Removed CONFIG_DEVFS_VOLUMES_UUID code entirely per Martin Wilck
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57 |
*
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58 |
* Wed Oct 10 2001 Matt Domsch <Matt_Domsch@dell.com>
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59 |
* - Changed function comments to DocBook style per Andreas Dilger suggestion.
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60 |
*
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61 |
* Mon Oct 08 2001 Matt Domsch <Matt_Domsch@dell.com>
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62 |
* - Change read_lba() to use the page cache per Al Viro's work.
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63 |
* - print u64s properly on all architectures
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64 |
* - fixed debug_printk(), now Dprintk()
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*
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* Mon Oct 01 2001 Matt Domsch <Matt_Domsch@dell.com>
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67 |
* - Style cleanups
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* - made most functions static
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* - Endianness addition
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* - remove test for second alternate header, as it's not per spec,
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71 |
* and is unnecessary. There's now a method to read/write the last
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72 |
* sector of an odd-sized disk from user space. No tools have ever
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73 |
* been released which used this code, so it's effectively dead.
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* - Per Asit Mallick of Intel, added a test for a valid PMBR.
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* - Added kernel command line option 'gpt' to override valid PMBR test.
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*
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* Wed Jun 6 2001 Martin Wilck <Martin.Wilck@Fujitsu-Siemens.com>
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* - added devfs volume UUID support (/dev/volumes/uuids) for
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* mounting file systems by the partition GUID.
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*
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81 |
* Tue Dec 5 2000 Matt Domsch <Matt_Domsch@dell.com>
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82 |
* - Moved crc32() to linux/lib, added efi_crc32().
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83 |
*
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84 |
* Thu Nov 30 2000 Matt Domsch <Matt_Domsch@dell.com>
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85 |
* - Replaced Intel's CRC32 function with an equivalent
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* non-license-restricted version.
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*
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* Wed Oct 25 2000 Matt Domsch <Matt_Domsch@dell.com>
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89 |
* - Fixed the last_lba() call to return the proper last block
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90 |
*
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91 |
* Thu Oct 12 2000 Matt Domsch <Matt_Domsch@dell.com>
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92 |
* - Thanks to Andries Brouwer for his debugging assistance.
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93 |
* - Code works, detects all the partitions.
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*
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************************************************************/
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96 |
#include <linux/crc32.h> |
|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
97 |
#include <linux/math64.h> |
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
98 |
#include "check.h" |
99 |
#include "efi.h" |
|
100 |
||
101 |
/* This allows a kernel command line option 'gpt' to override
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102 |
* the test for invalid PMBR. Not __initdata because reloading
|
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103 |
* the partition tables happens after init too.
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104 |
*/
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105 |
static int force_gpt; |
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106 |
static int __init |
|
107 |
force_gpt_fn(char *str) |
|
108 |
{
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|
109 |
force_gpt = 1; |
|
110 |
return 1; |
|
111 |
}
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112 |
__setup("gpt", force_gpt_fn); |
|
113 |
||
114 |
||
115 |
/**
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116 |
* efi_crc32() - EFI version of crc32 function
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117 |
* @buf: buffer to calculate crc32 of
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118 |
* @len - length of buf
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119 |
*
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120 |
* Description: Returns EFI-style CRC32 value for @buf
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121 |
*
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122 |
* This function uses the little endian Ethernet polynomial
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123 |
* but seeds the function with ~0, and xor's with ~0 at the end.
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124 |
* Note, the EFI Specification, v1.02, has a reference to
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|
125 |
* Dr. Dobbs Journal, May 1994 (actually it's in May 1992).
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|
126 |
*/
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|
127 |
static inline u32 |
|
128 |
efi_crc32(const void *buf, unsigned long len) |
|
129 |
{
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|
130 |
return (crc32(~0L, buf, len) ^ ~0L); |
|
131 |
}
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132 |
||
133 |
/**
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134 |
* last_lba(): return number of last logical block of device
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135 |
* @bdev: block device
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136 |
*
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137 |
* Description: Returns last LBA value on success, 0 on error.
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138 |
* This is stored (by sd and ide-geometry) in
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|
139 |
* the part[0] entry for this disk, and is the number of
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|
140 |
* physical sectors available on the disk.
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|
141 |
*/
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142 |
static u64 |
|
143 |
last_lba(struct block_device *bdev) |
|
144 |
{
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|
145 |
if (!bdev || !bdev->bd_inode) |
|
146 |
return 0; |
|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
147 |
return div_u64(bdev->bd_inode->i_size, |
148 |
bdev_logical_block_size(bdev)) - 1ULL; |
|
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
149 |
}
|
150 |
||
151 |
static inline int |
|
152 |
pmbr_part_valid(struct partition *part) |
|
153 |
{
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|
154 |
if (part->sys_ind == EFI_PMBR_OSTYPE_EFI_GPT && |
|
155 |
le32_to_cpu(part->start_sect) == 1UL) |
|
156 |
return 1; |
|
157 |
return 0; |
|
158 |
}
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|
159 |
||
160 |
/**
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161 |
* is_pmbr_valid(): test Protective MBR for validity
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162 |
* @mbr: pointer to a legacy mbr structure
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163 |
*
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|
164 |
* Description: Returns 1 if PMBR is valid, 0 otherwise.
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165 |
* Validity depends on two things:
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166 |
* 1) MSDOS signature is in the last two bytes of the MBR
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167 |
* 2) One partition of type 0xEE is found
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|
168 |
*/
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169 |
static int |
|
170 |
is_pmbr_valid(legacy_mbr *mbr) |
|
171 |
{
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172 |
int i; |
|
173 |
if (!mbr || le16_to_cpu(mbr->signature) != MSDOS_MBR_SIGNATURE) |
|
174 |
return 0; |
|
175 |
for (i = 0; i < 4; i++) |
|
176 |
if (pmbr_part_valid(&mbr->partition_record[i])) |
|
177 |
return 1; |
|
178 |
return 0; |
|
179 |
}
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180 |
||
181 |
/**
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182 |
* read_lba(): Read bytes from disk, starting at given LBA
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183 |
* @bdev
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184 |
* @lba
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185 |
* @buffer
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186 |
* @size_t
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187 |
*
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188 |
* Description: Reads @count bytes from @bdev into @buffer.
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189 |
* Returns number of bytes read on success, 0 on error.
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|
190 |
*/
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191 |
static size_t |
|
192 |
read_lba(struct block_device *bdev, u64 lba, u8 * buffer, size_t count) |
|
193 |
{
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194 |
size_t totalreadcount = 0; |
|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
195 |
sector_t n = lba * (bdev_logical_block_size(bdev) / 512); |
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
196 |
|
197 |
if (!bdev || !buffer || lba > last_lba(bdev)) |
|
198 |
return 0; |
|
199 |
||
200 |
while (count) { |
|
201 |
int copied = 512; |
|
202 |
Sector sect; |
|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
203 |
unsigned char *data = read_dev_sector(bdev, n++, §); |
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
204 |
if (!data) |
205 |
break; |
|
206 |
if (copied > count) |
|
207 |
copied = count; |
|
208 |
memcpy(buffer, data, copied); |
|
209 |
put_dev_sector(sect); |
|
210 |
buffer += copied; |
|
211 |
totalreadcount +=copied; |
|
212 |
count -= copied; |
|
213 |
}
|
|
214 |
return totalreadcount; |
|
215 |
}
|
|
216 |
||
217 |
/**
|
|
218 |
* alloc_read_gpt_entries(): reads partition entries from disk
|
|
219 |
* @bdev
|
|
220 |
* @gpt - GPT header
|
|
221 |
*
|
|
222 |
* Description: Returns ptes on success, NULL on error.
|
|
223 |
* Allocates space for PTEs based on information found in @gpt.
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|
224 |
* Notes: remember to free pte when you're done!
|
|
225 |
*/
|
|
226 |
static gpt_entry * |
|
227 |
alloc_read_gpt_entries(struct block_device *bdev, gpt_header *gpt) |
|
228 |
{
|
|
229 |
size_t count; |
|
230 |
gpt_entry *pte; |
|
231 |
if (!bdev || !gpt) |
|
232 |
return NULL; |
|
233 |
||
234 |
count = le32_to_cpu(gpt->num_partition_entries) * |
|
235 |
le32_to_cpu(gpt->sizeof_partition_entry); |
|
236 |
if (!count) |
|
237 |
return NULL; |
|
238 |
pte = kzalloc(count, GFP_KERNEL); |
|
239 |
if (!pte) |
|
240 |
return NULL; |
|
241 |
||
242 |
if (read_lba(bdev, le64_to_cpu(gpt->partition_entry_lba), |
|
243 |
(u8 *) pte, |
|
244 |
count) < count) { |
|
245 |
kfree(pte); |
|
246 |
pte=NULL; |
|
247 |
return NULL; |
|
248 |
}
|
|
249 |
return pte; |
|
250 |
}
|
|
251 |
||
252 |
/**
|
|
253 |
* alloc_read_gpt_header(): Allocates GPT header, reads into it from disk
|
|
254 |
* @bdev
|
|
255 |
* @lba is the Logical Block Address of the partition table
|
|
256 |
*
|
|
257 |
* Description: returns GPT header on success, NULL on error. Allocates
|
|
258 |
* and fills a GPT header starting at @ from @bdev.
|
|
259 |
* Note: remember to free gpt when finished with it.
|
|
260 |
*/
|
|
261 |
static gpt_header * |
|
262 |
alloc_read_gpt_header(struct block_device *bdev, u64 lba) |
|
263 |
{
|
|
264 |
gpt_header *gpt; |
|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
265 |
unsigned ssz = bdev_logical_block_size(bdev); |
266 |
||
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
267 |
if (!bdev) |
268 |
return NULL; |
|
269 |
||
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
270 |
gpt = kzalloc(ssz, GFP_KERNEL); |
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
271 |
if (!gpt) |
272 |
return NULL; |
|
273 |
||
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
274 |
if (read_lba(bdev, lba, (u8 *) gpt, ssz) < ssz) { |
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
275 |
kfree(gpt); |
276 |
gpt=NULL; |
|
277 |
return NULL; |
|
278 |
}
|
|
279 |
||
280 |
return gpt; |
|
281 |
}
|
|
282 |
||
283 |
/**
|
|
284 |
* is_gpt_valid() - tests one GPT header and PTEs for validity
|
|
285 |
* @bdev
|
|
286 |
* @lba is the logical block address of the GPT header to test
|
|
287 |
* @gpt is a GPT header ptr, filled on return.
|
|
288 |
* @ptes is a PTEs ptr, filled on return.
|
|
289 |
*
|
|
290 |
* Description: returns 1 if valid, 0 on error.
|
|
291 |
* If valid, returns pointers to newly allocated GPT header and PTEs.
|
|
292 |
*/
|
|
293 |
static int |
|
294 |
is_gpt_valid(struct block_device *bdev, u64 lba, |
|
295 |
gpt_header **gpt, gpt_entry **ptes) |
|
296 |
{
|
|
297 |
u32 crc, origcrc; |
|
298 |
u64 lastlba; |
|
299 |
||
300 |
if (!bdev || !gpt || !ptes) |
|
301 |
return 0; |
|
302 |
if (!(*gpt = alloc_read_gpt_header(bdev, lba))) |
|
303 |
return 0; |
|
304 |
||
305 |
/* Check the GUID Partition Table signature */
|
|
306 |
if (le64_to_cpu((*gpt)->signature) != GPT_HEADER_SIGNATURE) { |
|
307 |
pr_debug("GUID Partition Table Header signature is wrong:" |
|
308 |
"%lld != %lld\n", |
|
309 |
(unsigned long long)le64_to_cpu((*gpt)->signature), |
|
310 |
(unsigned long long)GPT_HEADER_SIGNATURE); |
|
311 |
goto fail; |
|
312 |
}
|
|
313 |
||
314 |
/* Check the GUID Partition Table CRC */
|
|
315 |
origcrc = le32_to_cpu((*gpt)->header_crc32); |
|
316 |
(*gpt)->header_crc32 = 0; |
|
317 |
crc = efi_crc32((const unsigned char *) (*gpt), le32_to_cpu((*gpt)->header_size)); |
|
318 |
||
319 |
if (crc != origcrc) { |
|
320 |
pr_debug("GUID Partition Table Header CRC is wrong: %x != %x\n", |
|
321 |
crc, origcrc); |
|
322 |
goto fail; |
|
323 |
}
|
|
324 |
(*gpt)->header_crc32 = cpu_to_le32(origcrc); |
|
325 |
||
326 |
/* Check that the my_lba entry points to the LBA that contains
|
|
327 |
* the GUID Partition Table */
|
|
328 |
if (le64_to_cpu((*gpt)->my_lba) != lba) { |
|
329 |
pr_debug("GPT my_lba incorrect: %lld != %lld\n", |
|
330 |
(unsigned long long)le64_to_cpu((*gpt)->my_lba), |
|
331 |
(unsigned long long)lba); |
|
332 |
goto fail; |
|
333 |
}
|
|
334 |
||
335 |
/* Check the first_usable_lba and last_usable_lba are
|
|
336 |
* within the disk.
|
|
337 |
*/
|
|
338 |
lastlba = last_lba(bdev); |
|
339 |
if (le64_to_cpu((*gpt)->first_usable_lba) > lastlba) { |
|
340 |
pr_debug("GPT: first_usable_lba incorrect: %lld > %lld\n", |
|
341 |
(unsigned long long)le64_to_cpu((*gpt)->first_usable_lba), |
|
342 |
(unsigned long long)lastlba); |
|
343 |
goto fail; |
|
344 |
}
|
|
345 |
if (le64_to_cpu((*gpt)->last_usable_lba) > lastlba) { |
|
346 |
pr_debug("GPT: last_usable_lba incorrect: %lld > %lld\n", |
|
347 |
(unsigned long long)le64_to_cpu((*gpt)->last_usable_lba), |
|
348 |
(unsigned long long)lastlba); |
|
349 |
goto fail; |
|
350 |
}
|
|
351 |
||
352 |
if (!(*ptes = alloc_read_gpt_entries(bdev, *gpt))) |
|
353 |
goto fail; |
|
354 |
||
355 |
/* Check the GUID Partition Entry Array CRC */
|
|
356 |
crc = efi_crc32((const unsigned char *) (*ptes), |
|
357 |
le32_to_cpu((*gpt)->num_partition_entries) * |
|
358 |
le32_to_cpu((*gpt)->sizeof_partition_entry)); |
|
359 |
||
360 |
if (crc != le32_to_cpu((*gpt)->partition_entry_array_crc32)) { |
|
361 |
pr_debug("GUID Partitition Entry Array CRC check failed.\n"); |
|
362 |
goto fail_ptes; |
|
363 |
}
|
|
364 |
||
365 |
/* We're done, all's well */
|
|
366 |
return 1; |
|
367 |
||
368 |
fail_ptes: |
|
369 |
kfree(*ptes); |
|
370 |
*ptes = NULL; |
|
371 |
fail: |
|
372 |
kfree(*gpt); |
|
373 |
*gpt = NULL; |
|
374 |
return 0; |
|
375 |
}
|
|
376 |
||
377 |
/**
|
|
378 |
* is_pte_valid() - tests one PTE for validity
|
|
379 |
* @pte is the pte to check
|
|
380 |
* @lastlba is last lba of the disk
|
|
381 |
*
|
|
382 |
* Description: returns 1 if valid, 0 on error.
|
|
383 |
*/
|
|
384 |
static inline int |
|
385 |
is_pte_valid(const gpt_entry *pte, const u64 lastlba) |
|
386 |
{
|
|
387 |
if ((!efi_guidcmp(pte->partition_type_guid, NULL_GUID)) || |
|
388 |
le64_to_cpu(pte->starting_lba) > lastlba || |
|
389 |
le64_to_cpu(pte->ending_lba) > lastlba) |
|
390 |
return 0; |
|
391 |
return 1; |
|
392 |
}
|
|
393 |
||
394 |
/**
|
|
395 |
* compare_gpts() - Search disk for valid GPT headers and PTEs
|
|
396 |
* @pgpt is the primary GPT header
|
|
397 |
* @agpt is the alternate GPT header
|
|
398 |
* @lastlba is the last LBA number
|
|
399 |
* Description: Returns nothing. Sanity checks pgpt and agpt fields
|
|
400 |
* and prints warnings on discrepancies.
|
|
401 |
*
|
|
402 |
*/
|
|
403 |
static void |
|
404 |
compare_gpts(gpt_header *pgpt, gpt_header *agpt, u64 lastlba) |
|
405 |
{
|
|
406 |
int error_found = 0; |
|
407 |
if (!pgpt || !agpt) |
|
408 |
return; |
|
409 |
if (le64_to_cpu(pgpt->my_lba) != le64_to_cpu(agpt->alternate_lba)) { |
|
410 |
printk(KERN_WARNING |
|
411 |
"GPT:Primary header LBA != Alt. header alternate_lba\n"); |
|
412 |
printk(KERN_WARNING "GPT:%lld != %lld\n", |
|
413 |
(unsigned long long)le64_to_cpu(pgpt->my_lba), |
|
414 |
(unsigned long long)le64_to_cpu(agpt->alternate_lba)); |
|
415 |
error_found++; |
|
416 |
}
|
|
417 |
if (le64_to_cpu(pgpt->alternate_lba) != le64_to_cpu(agpt->my_lba)) { |
|
418 |
printk(KERN_WARNING |
|
419 |
"GPT:Primary header alternate_lba != Alt. header my_lba\n"); |
|
420 |
printk(KERN_WARNING "GPT:%lld != %lld\n", |
|
421 |
(unsigned long long)le64_to_cpu(pgpt->alternate_lba), |
|
422 |
(unsigned long long)le64_to_cpu(agpt->my_lba)); |
|
423 |
error_found++; |
|
424 |
}
|
|
425 |
if (le64_to_cpu(pgpt->first_usable_lba) != |
|
426 |
le64_to_cpu(agpt->first_usable_lba)) { |
|
427 |
printk(KERN_WARNING "GPT:first_usable_lbas don't match.\n"); |
|
428 |
printk(KERN_WARNING "GPT:%lld != %lld\n", |
|
429 |
(unsigned long long)le64_to_cpu(pgpt->first_usable_lba), |
|
430 |
(unsigned long long)le64_to_cpu(agpt->first_usable_lba)); |
|
431 |
error_found++; |
|
432 |
}
|
|
433 |
if (le64_to_cpu(pgpt->last_usable_lba) != |
|
434 |
le64_to_cpu(agpt->last_usable_lba)) { |
|
435 |
printk(KERN_WARNING "GPT:last_usable_lbas don't match.\n"); |
|
436 |
printk(KERN_WARNING "GPT:%lld != %lld\n", |
|
437 |
(unsigned long long)le64_to_cpu(pgpt->last_usable_lba), |
|
438 |
(unsigned long long)le64_to_cpu(agpt->last_usable_lba)); |
|
439 |
error_found++; |
|
440 |
}
|
|
441 |
if (efi_guidcmp(pgpt->disk_guid, agpt->disk_guid)) { |
|
442 |
printk(KERN_WARNING "GPT:disk_guids don't match.\n"); |
|
443 |
error_found++; |
|
444 |
}
|
|
445 |
if (le32_to_cpu(pgpt->num_partition_entries) != |
|
446 |
le32_to_cpu(agpt->num_partition_entries)) { |
|
447 |
printk(KERN_WARNING "GPT:num_partition_entries don't match: " |
|
448 |
"0x%x != 0x%x\n", |
|
449 |
le32_to_cpu(pgpt->num_partition_entries), |
|
450 |
le32_to_cpu(agpt->num_partition_entries)); |
|
451 |
error_found++; |
|
452 |
}
|
|
453 |
if (le32_to_cpu(pgpt->sizeof_partition_entry) != |
|
454 |
le32_to_cpu(agpt->sizeof_partition_entry)) { |
|
455 |
printk(KERN_WARNING |
|
456 |
"GPT:sizeof_partition_entry values don't match: "
|
|
457 |
"0x%x != 0x%x\n", |
|
458 |
le32_to_cpu(pgpt->sizeof_partition_entry), |
|
459 |
le32_to_cpu(agpt->sizeof_partition_entry)); |
|
460 |
error_found++; |
|
461 |
}
|
|
462 |
if (le32_to_cpu(pgpt->partition_entry_array_crc32) != |
|
463 |
le32_to_cpu(agpt->partition_entry_array_crc32)) { |
|
464 |
printk(KERN_WARNING |
|
465 |
"GPT:partition_entry_array_crc32 values don't match: "
|
|
466 |
"0x%x != 0x%x\n", |
|
467 |
le32_to_cpu(pgpt->partition_entry_array_crc32), |
|
468 |
le32_to_cpu(agpt->partition_entry_array_crc32)); |
|
469 |
error_found++; |
|
470 |
}
|
|
471 |
if (le64_to_cpu(pgpt->alternate_lba) != lastlba) { |
|
472 |
printk(KERN_WARNING |
|
473 |
"GPT:Primary header thinks Alt. header is not at the end of the disk.\n"); |
|
474 |
printk(KERN_WARNING "GPT:%lld != %lld\n", |
|
475 |
(unsigned long long)le64_to_cpu(pgpt->alternate_lba), |
|
476 |
(unsigned long long)lastlba); |
|
477 |
error_found++; |
|
478 |
}
|
|
479 |
||
480 |
if (le64_to_cpu(agpt->my_lba) != lastlba) { |
|
481 |
printk(KERN_WARNING |
|
482 |
"GPT:Alternate GPT header not at the end of the disk.\n"); |
|
483 |
printk(KERN_WARNING "GPT:%lld != %lld\n", |
|
484 |
(unsigned long long)le64_to_cpu(agpt->my_lba), |
|
485 |
(unsigned long long)lastlba); |
|
486 |
error_found++; |
|
487 |
}
|
|
488 |
||
489 |
if (error_found) |
|
490 |
printk(KERN_WARNING |
|
491 |
"GPT: Use GNU Parted to correct GPT errors.\n"); |
|
492 |
return; |
|
493 |
}
|
|
494 |
||
495 |
/**
|
|
496 |
* find_valid_gpt() - Search disk for valid GPT headers and PTEs
|
|
497 |
* @bdev
|
|
498 |
* @gpt is a GPT header ptr, filled on return.
|
|
499 |
* @ptes is a PTEs ptr, filled on return.
|
|
500 |
* Description: Returns 1 if valid, 0 on error.
|
|
501 |
* If valid, returns pointers to newly allocated GPT header and PTEs.
|
|
502 |
* Validity depends on PMBR being valid (or being overridden by the
|
|
503 |
* 'gpt' kernel command line option) and finding either the Primary
|
|
504 |
* GPT header and PTEs valid, or the Alternate GPT header and PTEs
|
|
505 |
* valid. If the Primary GPT header is not valid, the Alternate GPT header
|
|
506 |
* is not checked unless the 'gpt' kernel command line option is passed.
|
|
507 |
* This protects against devices which misreport their size, and forces
|
|
508 |
* the user to decide to use the Alternate GPT.
|
|
509 |
*/
|
|
510 |
static int |
|
511 |
find_valid_gpt(struct block_device *bdev, gpt_header **gpt, gpt_entry **ptes) |
|
512 |
{
|
|
513 |
int good_pgpt = 0, good_agpt = 0, good_pmbr = 0; |
|
514 |
gpt_header *pgpt = NULL, *agpt = NULL; |
|
515 |
gpt_entry *pptes = NULL, *aptes = NULL; |
|
516 |
legacy_mbr *legacymbr; |
|
517 |
u64 lastlba; |
|
518 |
if (!bdev || !gpt || !ptes) |
|
519 |
return 0; |
|
520 |
||
521 |
lastlba = last_lba(bdev); |
|
522 |
if (!force_gpt) { |
|
523 |
/* This will be added to the EFI Spec. per Intel after v1.02. */
|
|
524 |
legacymbr = kzalloc(sizeof (*legacymbr), GFP_KERNEL); |
|
525 |
if (legacymbr) { |
|
526 |
read_lba(bdev, 0, (u8 *) legacymbr, |
|
527 |
sizeof (*legacymbr)); |
|
528 |
good_pmbr = is_pmbr_valid(legacymbr); |
|
529 |
kfree(legacymbr); |
|
530 |
}
|
|
531 |
if (!good_pmbr) |
|
532 |
goto fail; |
|
533 |
}
|
|
534 |
||
535 |
good_pgpt = is_gpt_valid(bdev, GPT_PRIMARY_PARTITION_TABLE_LBA, |
|
536 |
&pgpt, &pptes); |
|
537 |
if (good_pgpt) |
|
538 |
good_agpt = is_gpt_valid(bdev, |
|
539 |
le64_to_cpu(pgpt->alternate_lba), |
|
540 |
&agpt, &aptes); |
|
541 |
if (!good_agpt && force_gpt) |
|
542 |
good_agpt = is_gpt_valid(bdev, lastlba, |
|
543 |
&agpt, &aptes); |
|
544 |
||
545 |
/* The obviously unsuccessful case */
|
|
546 |
if (!good_pgpt && !good_agpt) |
|
547 |
goto fail; |
|
548 |
||
549 |
compare_gpts(pgpt, agpt, lastlba); |
|
550 |
||
551 |
/* The good cases */
|
|
552 |
if (good_pgpt) { |
|
553 |
*gpt = pgpt; |
|
554 |
*ptes = pptes; |
|
555 |
kfree(agpt); |
|
556 |
kfree(aptes); |
|
557 |
if (!good_agpt) { |
|
558 |
printk(KERN_WARNING |
|
559 |
"Alternate GPT is invalid, "
|
|
560 |
"using primary GPT.\n"); |
|
561 |
}
|
|
562 |
return 1; |
|
563 |
}
|
|
564 |
else if (good_agpt) { |
|
565 |
*gpt = agpt; |
|
566 |
*ptes = aptes; |
|
567 |
kfree(pgpt); |
|
568 |
kfree(pptes); |
|
569 |
printk(KERN_WARNING |
|
570 |
"Primary GPT is invalid, using alternate GPT.\n"); |
|
571 |
return 1; |
|
572 |
}
|
|
573 |
||
574 |
fail: |
|
575 |
kfree(pgpt); |
|
576 |
kfree(agpt); |
|
577 |
kfree(pptes); |
|
578 |
kfree(aptes); |
|
579 |
*gpt = NULL; |
|
580 |
*ptes = NULL; |
|
581 |
return 0; |
|
582 |
}
|
|
583 |
||
584 |
/**
|
|
585 |
* efi_partition(struct parsed_partitions *state, struct block_device *bdev)
|
|
586 |
* @state
|
|
587 |
* @bdev
|
|
588 |
*
|
|
589 |
* Description: called from check.c, if the disk contains GPT
|
|
590 |
* partitions, sets up partition entries in the kernel.
|
|
591 |
*
|
|
592 |
* If the first block on the disk is a legacy MBR,
|
|
593 |
* it will get handled by msdos_partition().
|
|
594 |
* If it's a Protective MBR, we'll handle it here.
|
|
595 |
*
|
|
596 |
* We do not create a Linux partition for GPT, but
|
|
597 |
* only for the actual data partitions.
|
|
598 |
* Returns:
|
|
599 |
* -1 if unable to read the partition table
|
|
600 |
* 0 if this isn't our partition table
|
|
601 |
* 1 if successful
|
|
602 |
*
|
|
603 |
*/
|
|
604 |
int
|
|
605 |
efi_partition(struct parsed_partitions *state, struct block_device *bdev) |
|
606 |
{
|
|
607 |
gpt_header *gpt = NULL; |
|
608 |
gpt_entry *ptes = NULL; |
|
609 |
u32 i; |
|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
610 |
unsigned ssz = bdev_logical_block_size(bdev) / 512; |
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
611 |
|
612 |
if (!find_valid_gpt(bdev, &gpt, &ptes) || !gpt || !ptes) { |
|
613 |
kfree(gpt); |
|
614 |
kfree(ptes); |
|
615 |
return 0; |
|
616 |
}
|
|
617 |
||
618 |
pr_debug("GUID Partition Table is valid! Yea!\n"); |
|
619 |
||
620 |
for (i = 0; i < le32_to_cpu(gpt->num_partition_entries) && i < state->limit-1; i++) { |
|
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
621 |
u64 start = le64_to_cpu(ptes[i].starting_lba); |
622 |
u64 size = le64_to_cpu(ptes[i].ending_lba) - |
|
623 |
le64_to_cpu(ptes[i].starting_lba) + 1ULL; |
|
624 |
||
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
625 |
if (!is_pte_valid(&ptes[i], last_lba(bdev))) |
626 |
continue; |
|
627 |
||
23
by Andy Whitcroft, Andy Whitcroft, Eric Miao, Ubuntu: 2.6.32-13.18, Ubuntu: 2.6.32-12.17, Ubuntu: 2.6.32-12.16
[ Andy Whitcroft ] |
628 |
put_partition(state, i+1, start * ssz, size * ssz); |
1
by Tim Gardner, Andy Whitcroft, Tim Gardner
[ Andy Whitcroft ] |
629 |
|
630 |
/* If this is a RAID volume, tell md */
|
|
631 |
if (!efi_guidcmp(ptes[i].partition_type_guid, |
|
632 |
PARTITION_LINUX_RAID_GUID)) |
|
633 |
state->parts[i+1].flags = 1; |
|
634 |
}
|
|
635 |
kfree(ptes); |
|
636 |
kfree(gpt); |
|
637 |
printk("\n"); |
|
638 |
return 1; |
|
639 |
}
|