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[format] fix large FAT32 format for GPT drives

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* Also set FSCTL_ALLOW_EXTENDED_DASD_IO before locking a drive
* Closes #181
This commit is contained in:
Tom Thornhill 2013-11-23 22:39:54 +00:00 • committed by Pete Batard
parent fcf16fed25
commit a5f98d636f
3 changed files with 24 additions and 11 deletions
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13
src/format.c
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@ -338,6 +338,7 @@ static BOOL FormatFAT32(DWORD DriveIndex)
DWORD cbRet;
DISK_GEOMETRY dgDrive;
PARTITION_INFORMATION piDrive;
PARTITION_INFORMATION_EX xpiDrive;
// Recommended values
DWORD ReservedSectCount = 32;
DWORD NumFATs = 2;
@ -387,7 +388,15 @@ static BOOL FormatFAT32(DWORD DriveIndex)
if (IS_ERROR(FormatStatus)) goto out;
if (!DeviceIoControl (hLogicalVolume, IOCTL_DISK_GET_PARTITION_INFO, NULL, 0, &piDrive,
sizeof(piDrive), &cbRet, NULL)) {
die("Failed to get partition info\n", ERROR_NOT_SUPPORTED);
if (!DeviceIoControl (hLogicalVolume, IOCTL_DISK_GET_PARTITION_INFO_EX, NULL, 0, &xpiDrive,
sizeof(xpiDrive), &cbRet, NULL)) {
die("Failed to get partition info (both regular and _ex)", ERROR_NOT_SUPPORTED);
}
memset (&piDrive, 0, sizeof(piDrive));
piDrive.StartingOffset.QuadPart = xpiDrive.StartingOffset.QuadPart;
piDrive.PartitionLength.QuadPart = xpiDrive.PartitionLength.QuadPart;
piDrive.HiddenSectors = (DWORD) (xpiDrive.StartingOffset.QuadPart / dgDrive.BytesPerSector);
}
BytesPerSect = dgDrive.BytesPerSector;
@ -419,7 +428,7 @@ static BOOL FormatFAT32(DWORD DriveIndex)
// fill out the boot sector and fs info
pFAT32BootSect->sJmpBoot[0]=0xEB;
pFAT32BootSect->sJmpBoot[1]=0x5A;
pFAT32BootSect->sJmpBoot[1]=0x58; // jmp.s $+0x5a is 0xeb 0x58, not 0xeb 0x5a. Thanks Marco!
pFAT32BootSect->sJmpBoot[2]=0x90;
strncpy((char*)pFAT32BootSect->sOEMName, "MSWIN4.1", 8);
pFAT32BootSect->wBytsPerSec = (WORD) BytesPerSect;