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https://github.com/reactos/reactos.git
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491 lines
13 KiB
C
491 lines
13 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS VFAT filesystem library
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* FILE: fat32.c
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* PURPOSE: Fat32 support
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* PROGRAMMERS: Casper S. Hornstrup (chorns@users.sourceforge.net)
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* Eric Kohl
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* REVISIONS:
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* EK 05/04-2003 Created
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*/
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#include "vfatlib.h"
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#define NDEBUG
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#include <debug.h>
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static ULONG
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GetShiftCount(ULONG Value)
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{
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ULONG i = 1;
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while (Value > 0)
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{
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i++;
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Value /= 2;
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}
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return i - 2;
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}
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static ULONG
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CalcVolumeSerialNumber(VOID)
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{
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LARGE_INTEGER SystemTime;
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TIME_FIELDS TimeFields;
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ULONG Serial;
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PUCHAR Buffer;
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NtQuerySystemTime (&SystemTime);
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RtlTimeToTimeFields (&SystemTime, &TimeFields);
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Buffer = (PUCHAR)&Serial;
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Buffer[0] = (UCHAR)(TimeFields.Year & 0xFF) + (UCHAR)(TimeFields.Hour & 0xFF);
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Buffer[1] = (UCHAR)(TimeFields.Year >> 8) + (UCHAR)(TimeFields.Minute & 0xFF);
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Buffer[2] = (UCHAR)(TimeFields.Month & 0xFF) + (UCHAR)(TimeFields.Second & 0xFF);
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Buffer[3] = (UCHAR)(TimeFields.Day & 0xFF) + (UCHAR)(TimeFields.Milliseconds & 0xFF);
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return Serial;
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}
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static NTSTATUS
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Fat32WriteBootSector (IN HANDLE FileHandle,
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IN PFAT32_BOOT_SECTOR BootSector,
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IN OUT PFORMAT_CONTEXT Context)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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PUCHAR NewBootSector;
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LARGE_INTEGER FileOffset;
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/* Allocate buffer for new bootsector */
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NewBootSector = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
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0,
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SECTORSIZE);
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if (NewBootSector == NULL)
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return(STATUS_INSUFFICIENT_RESOURCES);
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/* Zero the new bootsector */
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memset(NewBootSector, 0, SECTORSIZE);
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/* Copy FAT32 BPB to new bootsector */
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memcpy((NewBootSector + 3),
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&BootSector->OEMName[0],
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87); /* FAT32 BPB length (up to (not including) Res2) */
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/* Write sector 0 */
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FileOffset.QuadPart = 0ULL;
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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NewBootSector,
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SECTORSIZE,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, NewBootSector);
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return Status;
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}
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UpdateProgress (Context, 1);
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/* Write backup boot sector */
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if (BootSector->BootBackup != 0x0000)
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{
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FileOffset.QuadPart = (ULONGLONG)((ULONG) BootSector->BootBackup * SECTORSIZE);
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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NewBootSector,
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SECTORSIZE,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, NewBootSector);
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return Status;
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}
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UpdateProgress (Context, 1);
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}
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/* Free the new boot sector */
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RtlFreeHeap(RtlGetProcessHeap(), 0, NewBootSector);
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return Status;
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}
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static NTSTATUS
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Fat32WriteFsInfo (IN HANDLE FileHandle,
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IN PFAT32_BOOT_SECTOR BootSector,
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IN OUT PFORMAT_CONTEXT Context)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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PFAT32_FSINFO FsInfo;
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LARGE_INTEGER FileOffset;
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/* Allocate buffer for new sector */
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FsInfo = (PFAT32_FSINFO)RtlAllocateHeap(RtlGetProcessHeap(),
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0,
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BootSector->BytesPerSector);
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if (FsInfo == NULL)
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return(STATUS_INSUFFICIENT_RESOURCES);
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/* Zero the new sector */
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memset(FsInfo, 0, BootSector->BytesPerSector);
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FsInfo->LeadSig = 0x41615252;
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FsInfo->StrucSig = 0x61417272;
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FsInfo->FreeCount = 0xffffffff;
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FsInfo->NextFree = 0xffffffff;
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FsInfo->TrailSig = 0xaa550000;
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/* Write sector */
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FileOffset.QuadPart = BootSector->FSInfoSector * BootSector->BytesPerSector;
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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FsInfo,
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BootSector->BytesPerSector,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, FsInfo);
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return(Status);
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}
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UpdateProgress (Context, 1);
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/* Free the new sector buffer */
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RtlFreeHeap(RtlGetProcessHeap(), 0, FsInfo);
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return(Status);
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}
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static NTSTATUS
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Fat32WriteFAT (IN HANDLE FileHandle,
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IN ULONG SectorOffset,
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IN PFAT32_BOOT_SECTOR BootSector,
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IN OUT PFORMAT_CONTEXT Context)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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PUCHAR Buffer;
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LARGE_INTEGER FileOffset;
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ULONG i;
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ULONG Sectors;
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/* Allocate buffer */
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Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
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0,
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64 * 1024);
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if (Buffer == NULL)
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return(STATUS_INSUFFICIENT_RESOURCES);
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/* Zero the buffer */
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memset(Buffer, 0, 64 * 1024);
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/* FAT cluster 0 */
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Buffer[0] = 0xf8; /* Media type */
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Buffer[1] = 0xff;
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Buffer[2] = 0xff;
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Buffer[3] = 0x0f;
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/* FAT cluster 1 */
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Buffer[4] = 0xff; /* Clean shutdown, no disk read/write errors, end-of-cluster (EOC) mark */
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Buffer[5] = 0xff;
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Buffer[6] = 0xff;
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Buffer[7] = 0x0f;
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/* FAT cluster 2 */
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Buffer[8] = 0xff; /* End of root directory */
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Buffer[9] = 0xff;
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Buffer[10] = 0xff;
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Buffer[11] = 0x0f;
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/* Write first sector of the FAT */
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FileOffset.QuadPart = (SectorOffset + BootSector->ReservedSectors) * BootSector->BytesPerSector;
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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Buffer,
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BootSector->BytesPerSector,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return(Status);
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}
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UpdateProgress (Context, 1);
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/* Zero the begin of the buffer */
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memset(Buffer, 0, 12);
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/* Zero the rest of the FAT */
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Sectors = 64 * 1024 / BootSector->BytesPerSector;
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for (i = 1; i < BootSector->FATSectors32; i += Sectors)
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{
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/* Zero some sectors of the FAT */
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FileOffset.QuadPart = (SectorOffset + BootSector->ReservedSectors + i) * BootSector->BytesPerSector;
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if ((BootSector->FATSectors32 - i) <= Sectors)
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{
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Sectors = BootSector->FATSectors32 - i;
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}
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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Buffer,
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Sectors * BootSector->BytesPerSector,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return(Status);
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}
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UpdateProgress (Context, Sectors);
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}
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/* Free the buffer */
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return(Status);
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}
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static NTSTATUS
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Fat32WriteRootDirectory (IN HANDLE FileHandle,
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IN PFAT32_BOOT_SECTOR BootSector,
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IN OUT PFORMAT_CONTEXT Context)
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{
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IO_STATUS_BLOCK IoStatusBlock;
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NTSTATUS Status;
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PUCHAR Buffer;
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LARGE_INTEGER FileOffset;
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ULONGLONG FirstDataSector;
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ULONGLONG FirstRootDirSector;
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/* Allocate buffer for the cluster */
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Buffer = (PUCHAR)RtlAllocateHeap(RtlGetProcessHeap(),
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0,
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BootSector->SectorsPerCluster * BootSector->BytesPerSector);
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if (Buffer == NULL)
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return(STATUS_INSUFFICIENT_RESOURCES);
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/* Zero the buffer */
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memset(Buffer, 0, BootSector->SectorsPerCluster * BootSector->BytesPerSector);
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DPRINT("BootSector->ReservedSectors = %lu\n", BootSector->ReservedSectors);
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DPRINT("BootSector->FATSectors32 = %lu\n", BootSector->FATSectors32);
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DPRINT("BootSector->RootCluster = %lu\n", BootSector->RootCluster);
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DPRINT("BootSector->SectorsPerCluster = %lu\n", BootSector->SectorsPerCluster);
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/* Write cluster */
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FirstDataSector = BootSector->ReservedSectors +
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(BootSector->FATCount * BootSector->FATSectors32) + 0 /* RootDirSectors */;
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DPRINT("FirstDataSector = %lu\n", FirstDataSector);
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FirstRootDirSector = ((BootSector->RootCluster - 2) * BootSector->SectorsPerCluster) + FirstDataSector;
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FileOffset.QuadPart = FirstRootDirSector * BootSector->BytesPerSector;
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DPRINT("FirstRootDirSector = %lu\n", FirstRootDirSector);
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DPRINT("FileOffset = %lu\n", FileOffset.QuadPart);
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Status = NtWriteFile(FileHandle,
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NULL,
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NULL,
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NULL,
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&IoStatusBlock,
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Buffer,
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BootSector->SectorsPerCluster * BootSector->BytesPerSector,
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&FileOffset,
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NULL);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("NtWriteFile() failed (Status %lx)\n", Status);
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return(Status);
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}
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UpdateProgress (Context, (ULONG)BootSector->SectorsPerCluster);
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/* Free the buffer */
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RtlFreeHeap(RtlGetProcessHeap(), 0, Buffer);
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return(Status);
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}
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NTSTATUS
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Fat32Format (HANDLE FileHandle,
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PPARTITION_INFORMATION PartitionInfo,
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PDISK_GEOMETRY DiskGeometry,
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PUNICODE_STRING Label,
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BOOLEAN QuickFormat,
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ULONG ClusterSize,
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PFORMAT_CONTEXT Context)
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{
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FAT32_BOOT_SECTOR BootSector;
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OEM_STRING VolumeLabel;
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ULONG RootDirSectors;
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ULONG TmpVal1;
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ULONG TmpVal2;
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NTSTATUS Status;
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/* Calculate cluster size */
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if (ClusterSize == 0)
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{
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if (PartitionInfo->PartitionLength.QuadPart < 8LL * 1024LL * 1024LL * 1024LL)
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{
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/* Partition < 8GB ==> 4KB Cluster */
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ClusterSize = 4096;
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}
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else if (PartitionInfo->PartitionLength.QuadPart < 16LL * 1024LL * 1024LL * 1024LL)
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{
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/* Partition 8GB - 16GB ==> 8KB Cluster */
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ClusterSize = 8192;
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}
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else if (PartitionInfo->PartitionLength.QuadPart < 32LL * 1024LL * 1024LL * 1024LL)
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{
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/* Partition 16GB - 32GB ==> 16KB Cluster */
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ClusterSize = 16384;
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}
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else
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{
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/* Partition >= 32GB ==> 32KB Cluster */
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ClusterSize = 32768;
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}
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}
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memset(&BootSector, 0, sizeof(FAT32_BOOT_SECTOR));
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memcpy(&BootSector.OEMName[0], "MSWIN4.1", 8);
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BootSector.BytesPerSector = DiskGeometry->BytesPerSector;
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BootSector.SectorsPerCluster = ClusterSize / BootSector.BytesPerSector;
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BootSector.ReservedSectors = 32;
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BootSector.FATCount = 2;
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BootSector.RootEntries = 0;
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BootSector.Sectors = 0;
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BootSector.Media = 0xf8;
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BootSector.FATSectors = 0;
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BootSector.SectorsPerTrack = DiskGeometry->SectorsPerTrack;
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BootSector.Heads = DiskGeometry->TracksPerCylinder;
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BootSector.HiddenSectors = PartitionInfo->HiddenSectors;
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BootSector.SectorsHuge = PartitionInfo->PartitionLength.QuadPart >>
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GetShiftCount(BootSector.BytesPerSector); /* Use shifting to avoid 64-bit division */
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BootSector.FATSectors32 = 0; /* Set later */
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BootSector.ExtFlag = 0; /* Mirror all FATs */
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BootSector.FSVersion = 0x0000; /* 0:0 */
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BootSector.RootCluster = 2;
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BootSector.FSInfoSector = 1;
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BootSector.BootBackup = 6;
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BootSector.Drive = 0xff; /* No BIOS boot drive available */
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BootSector.ExtBootSignature = 0x29;
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BootSector.VolumeID = CalcVolumeSerialNumber ();
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if ((Label == NULL) || (Label->Buffer == NULL))
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{
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memcpy(&BootSector.VolumeLabel[0], "NO NAME ", 11);
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}
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else
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{
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RtlUnicodeStringToOemString(&VolumeLabel, Label, TRUE);
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memset(&BootSector.VolumeLabel[0], ' ', 11);
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memcpy(&BootSector.VolumeLabel[0], VolumeLabel.Buffer,
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VolumeLabel.Length < 11 ? VolumeLabel.Length : 11);
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RtlFreeOemString(&VolumeLabel);
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}
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memcpy(&BootSector.SysType[0], "FAT32 ", 8);
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RootDirSectors = ((BootSector.RootEntries * 32) +
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(BootSector.BytesPerSector - 1)) / BootSector.BytesPerSector;
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/* Calculate number of FAT sectors */
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/* (BytesPerSector / 4) FAT entries (32bit) fit into one sector */
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TmpVal1 = BootSector.SectorsHuge - BootSector.ReservedSectors;
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TmpVal2 = ((BootSector.BytesPerSector / 4) * BootSector.SectorsPerCluster) + BootSector.FATCount;
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BootSector.FATSectors32 = (TmpVal1 + (TmpVal2 - 1)) / TmpVal2;
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DPRINT("FATSectors32 = %lu\n", BootSector.FATSectors32);
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/* Init context data */
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Context->TotalSectorCount =
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2 + (BootSector.FATSectors32 * BootSector.FATCount) + BootSector.SectorsPerCluster;
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Status = Fat32WriteBootSector (FileHandle,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat32WriteBootSector() failed with status 0x%.08x\n", Status);
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return Status;
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}
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Status = Fat32WriteFsInfo (FileHandle,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat32WriteFsInfo() failed with status 0x%.08x\n", Status);
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return Status;
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}
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/* Write first FAT copy */
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Status = Fat32WriteFAT (FileHandle,
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0,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat32WriteFAT() failed with status 0x%.08x\n", Status);
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return Status;
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}
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/* Write second FAT copy */
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Status = Fat32WriteFAT (FileHandle,
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BootSector.FATSectors32,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat32WriteFAT() failed with status 0x%.08x.\n", Status);
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return Status;
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}
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Status = Fat32WriteRootDirectory (FileHandle,
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&BootSector,
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Context);
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if (!NT_SUCCESS(Status))
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{
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DPRINT("Fat32WriteRootDirectory() failed with status 0x%.08x\n", Status);
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}
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if (!QuickFormat)
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{
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/* FIXME: Fill remaining sectors */
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}
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return Status;
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}
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/* EOF */
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