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bug corrected in updating fat16

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erase clusters before use.

svn path=/trunk/; revision=1453
This commit is contained in:
jean 2000-12-07 16:58:42 +00:00
parent d8748695f2
commit 02d3c2cb72
1 changed files with 22 additions and 6 deletions
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28
reactos/drivers/fs/vfat/fat.c
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@ -1,5 +1,5 @@
/*
* $Id: fat.c,v 1.6 2000/06/29 23:35:50 dwelch Exp $
* $Id: fat.c,v 1.7 2000/12/07 16:58:42 jean Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
@ -356,7 +356,7 @@ void FAT16WriteCluster(PDEVICE_EXTENSION DeviceExt, ULONG ClusterToWrite,
VFATWriteSectors(DeviceExt->StorageDevice,
Start,
1,
(UCHAR *)Block);
((UCHAR *)Block)+FATsector*512);
Start += DeviceExt->Boot->FATSectors;
}
}
@ -370,6 +370,9 @@ void FAT32WriteCluster(PDEVICE_EXTENSION DeviceExt, ULONG ClusterToWrite,
ULONG FATsector;
ULONG FATeis;
PUSHORT Block;
ULONG Start;
int i;
struct _BootSector32 *pBoot;
DbgPrint("FAT32WriteCluster %u : %u\n",ClusterToWrite,NewValue);
Block = ExAllocatePool(NonPagedPool,BLOCKSIZE);
FATsector=ClusterToWrite/128;
@ -380,10 +383,17 @@ DbgPrint("FAT32WriteCluster %u : %u\n",ClusterToWrite,NewValue);
1,
(UCHAR *)Block);
Block[FATeis] = NewValue;
VFATWriteSectors(DeviceExt->StorageDevice,
DeviceExt->FATStart+FATsector,
/* Write the changed FAT sector to disk (all FAT's) */
Start = DeviceExt->FATStart + FATsector;
pBoot = (struct _BootSector32*) DeviceExt->Boot;
for (i = 0; i < pBoot->FATCount; i++)
{
VFATWriteSectors(DeviceExt->StorageDevice,
Start,
1,
(UCHAR *)Block);
Start += pBoot->FATSectors;
}
ExFreePool(Block);
}
@ -412,9 +422,10 @@ ULONG GetNextWriteCluster(PDEVICE_EXTENSION DeviceExt, ULONG CurrentCluster)
* FUNCTION: Determines the next cluster to be written
*/
{
ULONG LastCluster, NewCluster;
ULONG LastCluster, NewCluster;
UCHAR *Buffer2;
DPRINT1("GetNextWriteCluster(DeviceExt %x, CurrentCluster %x)\n",
DPRINT("GetNextWriteCluster(DeviceExt %x, CurrentCluster %x)\n",
DeviceExt,CurrentCluster);
/* Find out what was happening in the last cluster's AU */
@ -448,6 +459,11 @@ ULONG GetNextWriteCluster(PDEVICE_EXTENSION DeviceExt, ULONG CurrentCluster)
{
WriteCluster(DeviceExt, CurrentCluster, NewCluster);
}
// fill cluster with zero
Buffer2=ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
memset(Buffer2,0,DeviceExt->BytesPerCluster);
VFATWriteCluster(DeviceExt,Buffer2,NewCluster);
ExFreePool(Buffer2);
/* Return NewCluster as CurrentCluster */
return NewCluster;
}