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Patch by "starsseed" (with style fixes by myself):

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PartitionMapWriter::WriteMBR(): Also read the old MBR from disk when the boot
code shall be overwritten. Prevents overwriting of the disk ID. Closes ticket
#7507.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@41565 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
Ingo Weinhold 2011-05-18 10:34:53 +00:00
parent 222b8cf7b7
commit c2069a9a2e
2 changed files with 13 additions and 7 deletions
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4
src/add-ons/kernel/partitioning_systems/intel/PartitionMap.h
View File

@ -75,7 +75,9 @@ struct partition_descriptor {
// partition_table
struct partition_table {
char code_area[446];
char code_area[440];
uint32 disk_id;
uint16 reserved;
partition_descriptor table[4];
uint16 signature;

16
src/add-ons/kernel/partitioning_systems/intel/PartitionMapWriter.cpp
View File

@ -10,11 +10,14 @@
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <unistd.h>
#include <new>
#include <debug.h>
#ifndef _USER_MODE
# include <KernelExport.h>
#endif
@ -134,13 +137,14 @@ PartitionMapWriter::WriteMBR(const PartitionMap* map, bool writeBootCode)
return B_BAD_VALUE;
partition_table partitionTable;
status_t error = _ReadBlock(0, partitionTable);
if (error != B_OK)
return error;
if (writeBootCode) {
// the boot code must be small enough to fit in the code area
STATIC_ASSERT(sizeof(kBootCode) <= sizeof(partitionTable.code_area));
partitionTable.clear_code_area();
partitionTable.fill_code_area(kBootCode, sizeof(kBootCode));
} else {
status_t error = _ReadBlock(0, partitionTable);
if (error != B_OK)
return error;
}
partitionTable.signature = kPartitionTableSectorSignature;
@ -152,7 +156,7 @@ PartitionMapWriter::WriteMBR(const PartitionMap* map, bool writeBootCode)
partition->GetPartitionDescriptor(descriptor);
}
status_t error = _WriteBlock(0, partitionTable);
error = _WriteBlock(0, partitionTable);
return error;
}