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Fixed handling of large FAT32 partitions.

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svn path=/trunk/; revision=3928
This commit is contained in:
Hartmut Birr 2003-01-04 02:07:18 +00:00
parent 0a4d96cc81
commit 267074bb2e
3 changed files with 9 additions and 55 deletions
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47
reactos/drivers/fs/vfat/fat.c
View file

@ -1,5 +1,5 @@
/*
* $Id: fat.c,v 1.40 2002/10/01 19:27:18 chorns Exp $
* $Id: fat.c,v 1.41 2003/01/04 02:07:18 hbirr Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -632,7 +632,7 @@ WriteCluster(PDEVICE_EXTENSION DeviceExt,
return(Status);
}
ULONG
ULONGLONG
ClusterToSector(PDEVICE_EXTENSION DeviceExt,
ULONG Cluster)
/*
@ -641,7 +641,8 @@ ClusterToSector(PDEVICE_EXTENSION DeviceExt,
*/
{
return DeviceExt->FatInfo.dataStart +
((Cluster - 2) * DeviceExt->FatInfo.SectorsPerCluster);
((ULONGLONG)(Cluster - 2) * DeviceExt->FatInfo.SectorsPerCluster);
}
NTSTATUS
@ -774,44 +775,4 @@ GetNextCluster(PDEVICE_EXTENSION DeviceExt,
return(Status);
}
NTSTATUS
GetNextSector(PDEVICE_EXTENSION DeviceExt,
ULONG CurrentSector,
PULONG NextSector,
BOOLEAN Extend)
/* Some functions don't have access to the cluster they're really reading from.
Maybe this is a dirty solution, but it will allow them to handle fragmentation. */
{
NTSTATUS Status;
DPRINT("GetNextSector(DeviceExt %x, CurrentSector %x)\n",
DeviceExt,
CurrentSector);
if (CurrentSector<DeviceExt->FatInfo.dataStart || ((CurrentSector - DeviceExt->FatInfo.dataStart + 1) % DeviceExt->FatInfo.SectorsPerCluster))
/* Basically, if the next sequential sector would be on a cluster border, then we'll need to check in the FAT */
{
(*NextSector)=CurrentSector+1;
return (STATUS_SUCCESS);
}
else
{
CurrentSector = (CurrentSector - DeviceExt->FatInfo.dataStart) / DeviceExt->FatInfo.SectorsPerCluster + 2;
Status = GetNextCluster(DeviceExt, CurrentSector, NextSector, Extend);
if (!NT_SUCCESS(Status))
{
return(Status);
}
if ((*NextSector) == 0 || (*NextSector) == 0xffffffff)
{
/* The caller wants to know a sector. These FAT codes don't correspond to any sector. */
return(STATUS_UNSUCCESSFUL);
}
(*NextSector) = ClusterToSector(DeviceExt,(*NextSector));
return(STATUS_SUCCESS);
}
}
/* EOF */

6
reactos/drivers/fs/vfat/rw.c
View file

@ -1,5 +1,5 @@
/* $Id: rw.c,v 1.51 2003/01/03 23:58:31 gvg Exp $
/* $Id: rw.c,v 1.52 2003/01/04 02:07:18 hbirr Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -273,7 +273,6 @@ VfatReadFileData (PVFAT_IRP_CONTEXT IrpContext, PVOID Buffer,
NTSTATUS Status;
ULONG BytesDone;
ULONG BytesPerSector;
LARGE_INTEGER BytesPerSectorLarge;
ULONG BytesPerCluster;
/* PRECONDITION */
@ -293,7 +292,6 @@ VfatReadFileData (PVFAT_IRP_CONTEXT IrpContext, PVOID Buffer,
Ccb = (PVFATCCB)IrpContext->FileObject->FsContext2;
Fcb = Ccb->pFcb;
BytesPerSector = DeviceExt->FatInfo.BytesPerSector;
BytesPerSectorLarge.QuadPart = BytesPerSector;
BytesPerCluster = DeviceExt->FatInfo.BytesPerCluster;
assert(ReadOffset.QuadPart + Length <= ROUND_UP(Fcb->RFCB.FileSize.QuadPart, BytesPerSector));
@ -377,7 +375,7 @@ VfatReadFileData (PVFAT_IRP_CONTEXT IrpContext, PVOID Buffer,
while (Length > 0 && CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
{
StartCluster = CurrentCluster;
StartOffset.QuadPart = ClusterToSector(DeviceExt, StartCluster) * BytesPerSectorLarge.QuadPart;
StartOffset.QuadPart = ClusterToSector(DeviceExt, StartCluster) * BytesPerSector;
BytesDone = 0;
ClusterCount = 0;

11
reactos/drivers/fs/vfat/vfat.h
View file

@ -1,4 +1,4 @@
/* $Id: vfat.h,v 1.49 2002/12/03 01:14:49 hbirr Exp $ */
/* $Id: vfat.h,v 1.50 2003/01/04 02:07:18 hbirr Exp $ */
#include <ddk/ntifs.h>
@ -397,19 +397,14 @@ NTSTATUS OffsetToCluster (PDEVICE_EXTENSION DeviceExt,
PULONG Cluster,
BOOLEAN Extend);
ULONG ClusterToSector (PDEVICE_EXTENSION DeviceExt,
ULONG Cluster);
ULONGLONG ClusterToSector (PDEVICE_EXTENSION DeviceExt,
ULONG Cluster);
NTSTATUS GetNextCluster (PDEVICE_EXTENSION DeviceExt,
ULONG CurrentCluster,
PULONG NextCluster,
BOOLEAN Extend);
NTSTATUS GetNextSector (PDEVICE_EXTENSION DeviceExt,
ULONG CurrentSector,
PULONG NextSector,
BOOLEAN Extend);
NTSTATUS CountAvailableClusters (PDEVICE_EXTENSION DeviceExt,
PLARGE_INTEGER Clusters);