-/* $Id: rw.c,v 1.1 1999/12/11 21:14:49 dwelch Exp $
+
+/* $Id: rw.c,v 1.36 2002/01/15 21:54:51 hbirr Exp $
*
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
/* INCLUDES *****************************************************************/
-#include <wchar.h>
-#include <internal/string.h>
#include <ddk/ntddk.h>
-#include <ddk/cctypes.h>
+#include <wchar.h>
+#include <ntos/minmax.h>
#define NDEBUG
-#include <internal/debug.h>
+#include <debug.h>
#include "vfat.h"
-/* FUNCTIONS ****************************************************************/
+/* GLOBALS *******************************************************************/
+
+#define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
+#define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
+
+/* FUNCTIONS *****************************************************************/
+
+NTSTATUS
+NextCluster(PDEVICE_EXTENSION DeviceExt,
+ PVFATFCB Fcb,
+ ULONG FirstCluster,
+ PULONG CurrentCluster,
+ BOOLEAN Extend)
+ /*
+ * Return the next cluster in a FAT chain, possibly extending the chain if
+ * necessary
+ */
+{
+ if (Fcb != NULL && Fcb->Flags & FCB_IS_PAGE_FILE)
+ {
+ ULONG i;
+ PULONG FatChain;
+ NTSTATUS Status;
+ DPRINT("NextCluster(Fcb %x, FirstCluster %x, Extend %d)\n", Fcb, FirstCluster, Extend);
+ if (Fcb->FatChainSize == 0)
+ {
+ // paging file with zero length
+ *CurrentCluster = 0xffffffff;
+ if (Extend)
+ {
+ Fcb->FatChain = ExAllocatePool(NonPagedPool, sizeof(ULONG));
+ if (!Fcb->FatChain)
+ {
+ return STATUS_UNSUCCESSFUL;
+ }
+ Status = GetNextCluster(DeviceExt, 0, CurrentCluster, TRUE);
+ if (!NT_SUCCESS(Status))
+ {
+ ExFreePool(Fcb->FatChain);
+ return Status;
+ }
+ Fcb->FatChain[0] = *CurrentCluster;
+ Fcb->FatChainSize = 1;
+ return Status;
+ }
+ else
+ {
+ return STATUS_UNSUCCESSFUL;
+ }
+ }
+ else
+ {
+ for (i = 0; i < Fcb->FatChainSize; i++)
+ {
+ if (Fcb->FatChain[i] == *CurrentCluster)
+ break;
+ }
+ if (i >= Fcb->FatChainSize)
+ {
+ return STATUS_UNSUCCESSFUL;
+ }
+ if (i == Fcb->FatChainSize - 1)
+ {
+ if (Extend)
+ {
+ FatChain = ExAllocatePool(NonPagedPool, (i + 2) * sizeof(ULONG));
+ if (!FatChain)
+ {
+ *CurrentCluster = 0xffffffff;
+ return STATUS_UNSUCCESSFUL;
+ }
+ Status = GetNextCluster(DeviceExt, *CurrentCluster, CurrentCluster, TRUE);
+ if (NT_SUCCESS(Status) && *CurrentCluster != 0xffffffff)
+ {
+ memcpy(FatChain, Fcb->FatChain, (i + 1) * sizeof(ULONG));
+ FatChain[i + 1] = *CurrentCluster;
+ ExFreePool(Fcb->FatChain);
+ Fcb->FatChain = FatChain;
+ Fcb->FatChainSize = i + 2;
+ }
+ else
+ ExFreePool(FatChain);
+ return Status;
+ }
+ else
+ {
+ *CurrentCluster = 0xffffffff;
+ return STATUS_UNSUCCESSFUL;
+ }
+ }
+ *CurrentCluster = Fcb->FatChain[i + 1];
+ return STATUS_SUCCESS;
+ }
+ }
+ if (FirstCluster == 1)
+ {
+ (*CurrentCluster) += DeviceExt->Boot->SectorsPerCluster;
+ return(STATUS_SUCCESS);
+ }
+ else
+ {
+ /*
+ * CN: FIXME: Real bug here or in dirwr, where CurrentCluster isn't
+ * initialized when 0
+ */
+ if (FirstCluster == 0)
+ {
+ NTSTATUS Status;
+
+ Status = GetNextCluster(DeviceExt, 0, CurrentCluster,
+ Extend);
+ return(Status);
+ }
+ else
+ {
+ NTSTATUS Status;
+
+ Status = GetNextCluster(DeviceExt, (*CurrentCluster), CurrentCluster,
+ Extend);
+ return(Status);
+ }
+ }
+}
+
+NTSTATUS
+OffsetToCluster(PDEVICE_EXTENSION DeviceExt,
+ PVFATFCB Fcb,
+ ULONG FirstCluster,
+ ULONG FileOffset,
+ PULONG Cluster,
+ BOOLEAN Extend)
+ /*
+ * Return the cluster corresponding to an offset within a file,
+ * possibly extending the file if necessary
+ */
+{
+ ULONG CurrentCluster;
+ ULONG i;
+ NTSTATUS Status;
+ DPRINT("OffsetToCluster(DeviceExt %x, Fcb %x, FirstCluster %x,"
+ " FileOffset %x, Cluster %x, Extend %d)\n", DeviceExt,
+ Fcb, FirstCluster, FileOffset, Cluster, Extend);
+ if (FirstCluster == 0)
+ {
+ DbgPrint("OffsetToCluster is called with FirstCluster = 0!\n");
+ KeBugCheck(0);
+ }
+
+ if (Fcb != NULL && Fcb->Flags & FCB_IS_PAGE_FILE)
+ {
+ ULONG NCluster;
+ ULONG Offset = FileOffset / DeviceExt->BytesPerCluster;
+ PULONG FatChain;
+ int i;
+ if (Fcb->FatChainSize == 0)
+ {
+ DbgPrint("OffsetToCluster is called with FirstCluster = %x"
+ " and Fcb->FatChainSize = 0!\n", FirstCluster);
+ KeBugCheck(0);
+ }
+ if (Offset < Fcb->FatChainSize)
+ {
+ *Cluster = Fcb->FatChain[Offset];
+ return STATUS_SUCCESS;
+ }
+ else
+ {
+ if (!Extend)
+ {
+ *Cluster = 0xffffffff;
+ return STATUS_UNSUCCESSFUL;
+ }
+ else
+ {
+ FatChain = ExAllocatePool(NonPagedPool, (Offset + 1) * sizeof(ULONG));
+ if (!FatChain)
+ {
+ *Cluster = 0xffffffff;
+ return STATUS_UNSUCCESSFUL;
+ }
+
+ CurrentCluster = Fcb->FatChain[Fcb->FatChainSize - 1];
+ FatChain[Fcb->FatChainSize - 1] = CurrentCluster;
+ for (i = Fcb->FatChainSize; i < Offset + 1; i++)
+ {
+ Status = GetNextCluster(DeviceExt, CurrentCluster, &CurrentCluster, TRUE);
+ if (!NT_SUCCESS(Status) || CurrentCluster == 0xFFFFFFFF)
+ {
+ while (i >= Fcb->FatChainSize)
+ {
+ WriteCluster(DeviceExt, FatChain[i - 1], 0xFFFFFFFF);
+ i--;
+ }
+ *Cluster = 0xffffffff;
+ ExFreePool(FatChain);
+ if (!NT_SUCCESS(Status))
+ return Status;
+ return STATUS_UNSUCCESSFUL;
+ }
+ FatChain[i] = CurrentCluster;
+ }
+ memcpy (FatChain, Fcb->FatChain, Fcb->FatChainSize * sizeof(ULONG));
+ ExFreePool(Fcb->FatChain);
+ Fcb->FatChain = FatChain;
+ Fcb->FatChainSize = Offset + 1;
+ }
+ }
+ *Cluster = CurrentCluster;
+ return(STATUS_SUCCESS);
+ }
+ if (FirstCluster == 1)
+ {
+ /* root of FAT16 or FAT12 */
+ *Cluster = DeviceExt->rootStart + FileOffset
+ / (DeviceExt->BytesPerCluster) * DeviceExt->Boot->SectorsPerCluster;
+ return(STATUS_SUCCESS);
+ }
+ else
+ {
+ CurrentCluster = FirstCluster;
+ for (i = 0; i < FileOffset / DeviceExt->BytesPerCluster; i++)
+ {
+ Status = GetNextCluster (DeviceExt, CurrentCluster, &CurrentCluster,
+ Extend);
+ if (!NT_SUCCESS(Status))
+ {
+ return(Status);
+ }
+ }
+ *Cluster = CurrentCluster;
+ return(STATUS_SUCCESS);
+ }
+}
-NTSTATUS FsdReadFile(PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
- PVOID Buffer, ULONG Length, ULONG ReadOffset,
- PULONG LengthRead)
+NTSTATUS
+VfatReadCluster(PDEVICE_EXTENSION DeviceExt,
+ PVFATFCB Fcb,
+ ULONG FirstCluster,
+ PULONG CurrentCluster,
+ PVOID Destination,
+ ULONG InternalOffset,
+ ULONG InternalLength)
+{
+ PVOID BaseAddress = NULL;
+ NTSTATUS Status;
+
+ if (InternalLength == DeviceExt->BytesPerCluster)
+ {
+ Status = VfatRawReadCluster(DeviceExt, FirstCluster,
+ Destination, *CurrentCluster, 1);
+ }
+ else
+ {
+ BaseAddress = ExAllocatePool(NonPagedPool, DeviceExt->BytesPerCluster);
+ if (BaseAddress == NULL)
+ {
+ return(STATUS_NO_MEMORY);
+ }
+ Status = VfatRawReadCluster(DeviceExt, FirstCluster,
+ BaseAddress, *CurrentCluster, 1);
+ memcpy(Destination, BaseAddress + InternalOffset, InternalLength);
+ ExFreePool(BaseAddress);
+ }
+ if (!NT_SUCCESS(Status))
+ {
+ return(Status);
+ }
+ Status = NextCluster(DeviceExt, Fcb, FirstCluster, CurrentCluster, FALSE);
+ return(Status);
+}
+
+NTSTATUS
+VfatReadFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
+ PVOID Buffer, ULONG Length, ULONG ReadOffset,
+ PULONG LengthRead, ULONG NoCache)
/*
* FUNCTION: Reads data from a file
*/
{
- ULONG CurrentCluster;
- ULONG FileOffset;
- ULONG FirstCluster;
- PVFATFCB Fcb;
- PVOID Temp;
- ULONG TempLength;
-
- /* PRECONDITION */
- assert(DeviceExt != NULL);
- assert(DeviceExt->BytesPerCluster != 0);
- assert(FileObject != NULL);
- assert(FileObject->FsContext != NULL);
-
- DPRINT("FsdReadFile(DeviceExt %x, FileObject %x, Buffer %x, "
- "Length %d, ReadOffset %d)\n",DeviceExt,FileObject,Buffer,
- Length,ReadOffset);
-
- Fcb = ((PVFATCCB)(FileObject->FsContext2))->pFcb;
- if (DeviceExt->FatType == FAT32)
- CurrentCluster = Fcb->entry.FirstCluster
- +Fcb->entry.FirstClusterHigh*65536;
- else
- CurrentCluster = Fcb->entry.FirstCluster;
- FirstCluster=CurrentCluster;
- DPRINT("DeviceExt->BytesPerCluster %x\n",DeviceExt->BytesPerCluster);
-
- if (Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY)
- {
- return(STATUS_FILE_IS_A_DIRECTORY);
- }
-
- if (ReadOffset >= Fcb->entry.FileSize
- && !(Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY))
- {
- return(STATUS_END_OF_FILE);
- }
- if ((ReadOffset + Length) > Fcb->entry.FileSize
- && !(Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY))
- {
- Length = Fcb->entry.FileSize - ReadOffset;
- }
- *LengthRead = 0;
- /* FIXME: optimize by remembering the last cluster read and using if possible */
- Temp = ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
- if(!Temp) return STATUS_UNSUCCESSFUL;
- if (FirstCluster==1)
- { //root of FAT16 or FAT12
- CurrentCluster=DeviceExt->rootStart+ReadOffset
- /(DeviceExt->BytesPerCluster)*DeviceExt->Boot->SectorsPerCluster;
- }
- else
- for (FileOffset=0; FileOffset < ReadOffset / DeviceExt->BytesPerCluster
- ; FileOffset++)
- {
- CurrentCluster = GetNextCluster(DeviceExt,CurrentCluster);
- }
- CHECKPOINT;
- if ((ReadOffset % DeviceExt->BytesPerCluster)!=0)
- {
- if (FirstCluster==1)
+ ULONG CurrentCluster;
+ ULONG FirstCluster;
+ ULONG StartCluster;
+ ULONG ClusterCount;
+ PVFATFCB Fcb;
+ PVFATCCB Ccb;
+ NTSTATUS Status;
+ ULONG TempLength;
+ LARGE_INTEGER FileOffset;
+ IO_STATUS_BLOCK IoStatus;
+
+ /* PRECONDITION */
+ assert (DeviceExt != NULL);
+ assert (DeviceExt->BytesPerCluster != 0);
+ assert (FileObject != NULL);
+ assert (FileObject->FsContext2 != NULL);
+
+ DPRINT("VfatReadFile(DeviceExt %x, FileObject %x, Buffer %x, "
+ "Length %d, ReadOffset 0x%x)\n", DeviceExt, FileObject, Buffer,
+ Length, ReadOffset);
+
+ *LengthRead = 0;
+
+ Ccb = (PVFATCCB)FileObject->FsContext2;
+ Fcb = Ccb->pFcb;
+
+ // Is this a read of the FAT ?
+ if (Fcb->Flags & FCB_IS_FAT)
+ {
+ if (!NoCache)
{
- VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Temp);
- CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
+ DbgPrint ("Cached FAT read outside from VFATFS.SYS\n");
+ KeBugCheck (0);
}
- else
+ if (ReadOffset >= Fcb->RFCB.FileSize.QuadPart || ReadOffset % BLOCKSIZE != 0 || Length % BLOCKSIZE != 0)
{
- VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
- CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
- }
- TempLength = min(Length,DeviceExt->BytesPerCluster -
- (ReadOffset % DeviceExt->BytesPerCluster));
-
- memcpy(Buffer, Temp + ReadOffset % DeviceExt->BytesPerCluster,
- TempLength);
-
- (*LengthRead) = (*LengthRead) + TempLength;
- Length = Length - TempLength;
- Buffer = Buffer + TempLength;
- }
- CHECKPOINT;
- while (Length >= DeviceExt->BytesPerCluster)
- {
- if (FirstCluster==1)
+ DbgPrint ("Start or end of FAT read is not on a sector boundary\n");
+ KeBugCheck (0);
+ }
+ if (ReadOffset + Length > Fcb->RFCB.FileSize.QuadPart)
+ {
+ Length = Fcb->RFCB.FileSize.QuadPart - ReadOffset;
+ }
+
+ Status = VfatReadSectors(DeviceExt->StorageDevice,
+ DeviceExt->FATStart + ReadOffset / BLOCKSIZE, Length / BLOCKSIZE, Buffer);
+ if (NT_SUCCESS(Status))
{
- VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Buffer);
- CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
+ *LengthRead = Length;
}
else
{
- VFATLoadCluster(DeviceExt,Buffer,CurrentCluster);
- CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
+ DPRINT1("FAT reading failed, Status %x\n", Status);
}
- if (CurrentCluster == 0xffffffff)
- {
- ExFreePool(Temp);
- return(STATUS_SUCCESS);
- }
-
- (*LengthRead) = (*LengthRead) + DeviceExt->BytesPerCluster;
- Buffer = Buffer + DeviceExt->BytesPerCluster;
- Length = Length - DeviceExt->BytesPerCluster;
+ return Status;
+ }
+
+ /*
+ * Find the first cluster
+ */
+ FirstCluster = CurrentCluster = vfatDirEntryGetFirstCluster (DeviceExt, &Fcb->entry);
+
+ /*
+ * Truncate the read if necessary
+ */
+ if (!(Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY))
+ {
+ if (ReadOffset >= Fcb->entry.FileSize)
+ {
+ return (STATUS_END_OF_FILE);
+ }
+ if ((ReadOffset + Length) > Fcb->entry.FileSize)
+ {
+ Length = Fcb->entry.FileSize - ReadOffset;
+ }
+ }
+
+ if (FirstCluster == 1)
+ {
+ // root directory of FAT12 od FAT16
+ if (ReadOffset + Length > DeviceExt->rootDirectorySectors * BLOCKSIZE)
+ {
+ Length = DeviceExt->rootDirectorySectors * BLOCKSIZE - ReadOffset;
+ }
+ }
+
+ // using the Cc-interface if possible
+ if (!NoCache)
+ {
+ FileOffset.QuadPart = ReadOffset;
+ CcCopyRead(FileObject, &FileOffset, Length, TRUE, Buffer, &IoStatus);
+ *LengthRead = IoStatus.Information;
+ return IoStatus.Status;
+ }
+
+ /*
+ * Find the cluster to start the read from
+ */
+ if (Ccb->LastCluster > 0 && ReadOffset > Ccb->LastOffset)
+ {
+ CurrentCluster = Ccb->LastCluster;
+ }
+ Status = OffsetToCluster(DeviceExt,
+ Fcb,
+ FirstCluster,
+ ROUND_DOWN(ReadOffset, DeviceExt->BytesPerCluster),
+ &CurrentCluster,
+ FALSE);
+ if (!NT_SUCCESS(Status))
+ {
+ return(Status);
+ }
+ /*
+ * If the read doesn't begin on a chunk boundary then we need special
+ * handling
+ */
+ if ((ReadOffset % DeviceExt->BytesPerCluster) != 0 )
+ {
+ TempLength = min (Length, DeviceExt->BytesPerCluster - (ReadOffset % DeviceExt->BytesPerCluster));
+ Ccb->LastCluster = CurrentCluster;
+ Ccb->LastOffset = ROUND_DOWN(ReadOffset, DeviceExt->BytesPerCluster);
+ Status = VfatReadCluster(DeviceExt, Fcb, FirstCluster, &CurrentCluster,
+ Buffer, ReadOffset % DeviceExt->BytesPerCluster,
+ TempLength);
+ if (NT_SUCCESS(Status))
+ {
+ (*LengthRead) = (*LengthRead) + TempLength;
+ Length = Length - TempLength;
+ Buffer = Buffer + TempLength;
+ ReadOffset = ReadOffset + TempLength;
+ }
+ }
+
+ while (Length >= DeviceExt->BytesPerCluster && CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
+ {
+ StartCluster = CurrentCluster;
+ ClusterCount = 0;
+ // search for continous clusters
+ do
+ {
+ ClusterCount++;
+ Status = NextCluster(DeviceExt, Fcb, FirstCluster, &CurrentCluster, FALSE);
+ }
+ while (StartCluster + ClusterCount == CurrentCluster && NT_SUCCESS(Status) &&
+ Length - ClusterCount * DeviceExt->BytesPerCluster >= DeviceExt->BytesPerCluster);
+ DPRINT("Count %d, Start %x Next %x\n", ClusterCount, StartCluster, CurrentCluster);
+ Ccb->LastCluster = StartCluster + (ClusterCount - 1);
+ Ccb->LastOffset = ReadOffset + (ClusterCount - 1) * DeviceExt->BytesPerCluster;
+
+ Status = VfatRawReadCluster(DeviceExt, FirstCluster, Buffer, StartCluster, ClusterCount);
+ if (NT_SUCCESS(Status))
+ {
+ ClusterCount *= DeviceExt->BytesPerCluster;
+ (*LengthRead) = (*LengthRead) + ClusterCount;
+ Buffer += ClusterCount;
+ Length -= ClusterCount;
+ ReadOffset += ClusterCount;
+ }
+ }
+ /*
+ * If the read doesn't end on a chunk boundary then we need special
+ * handling
+ */
+ if (Length > 0 && CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
+ {
+ Ccb->LastCluster = CurrentCluster;
+ Ccb->LastOffset = ReadOffset + DeviceExt->BytesPerCluster;
+
+ Status = VfatReadCluster(DeviceExt, Fcb, FirstCluster, &CurrentCluster,
+ Buffer, 0, Length);
+ if (NT_SUCCESS(Status))
+ {
+ (*LengthRead) = (*LengthRead) + Length;
+ }
+ }
+ return Status;
+}
+
+NTSTATUS
+VfatWriteCluster(PDEVICE_EXTENSION DeviceExt,
+ PVFATFCB Fcb,
+ ULONG StartOffset,
+ ULONG FirstCluster,
+ PULONG CurrentCluster,
+ PVOID Source,
+ ULONG InternalOffset,
+ ULONG InternalLength)
+{
+ PVOID BaseAddress;
+ NTSTATUS Status;
+
+ if (InternalLength != DeviceExt->BytesPerCluster)
+ {
+ BaseAddress = ExAllocatePool(NonPagedPool, DeviceExt->BytesPerCluster);
+ if (BaseAddress == NULL)
+ {
+ return(STATUS_NO_MEMORY);
}
- CHECKPOINT;
- if (Length > 0)
+ }
+ else
+ BaseAddress = Source;
+ if (InternalLength != DeviceExt->BytesPerCluster)
+ {
+ /*
+ * If the data in the cache isn't valid or we are bypassing the
+ * cache and not writing a cluster aligned, cluster sized region
+ * then read data in to base address
+ */
+ Status = VfatRawReadCluster(DeviceExt, FirstCluster, BaseAddress,
+ *CurrentCluster, 1);
+ if (!NT_SUCCESS(Status))
{
- (*LengthRead) = (*LengthRead) + Length;
- if (FirstCluster==1)
- {
- VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Temp);
- CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
- }
- else
- {
- VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
- CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
- }
- memcpy(Buffer, Temp, Length);
+ if (InternalLength != DeviceExt->BytesPerCluster)
+ {
+ ExFreePool(BaseAddress);
+ }
+ return(Status);
}
- ExFreePool(Temp);
- return(STATUS_SUCCESS);
+ memcpy(BaseAddress + InternalOffset, Source, InternalLength);
+ }
+ /*
+ * Write the data back to disk
+ */
+ DPRINT("Writing 0x%x\n", *CurrentCluster);
+ Status = VfatRawWriteCluster(DeviceExt, FirstCluster, BaseAddress,
+ *CurrentCluster, 1);
+ if (InternalLength != DeviceExt->BytesPerCluster)
+ {
+ ExFreePool(BaseAddress);
+ }
+ if (!NT_SUCCESS(Status))
+ {
+ return Status;
+ }
+ Status = NextCluster(DeviceExt, Fcb, FirstCluster, CurrentCluster, FALSE);
+ return(Status);
}
-NTSTATUS FsdWriteFile(PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
- PVOID Buffer, ULONG Length, ULONG WriteOffset)
+NTSTATUS
+VfatWriteFile (PDEVICE_EXTENSION DeviceExt, PFILE_OBJECT FileObject,
+ PVOID Buffer, ULONG Length, ULONG WriteOffset,
+ BOOLEAN NoCache, BOOLEAN PageIo)
/*
* FUNCTION: Writes data to file
*/
{
- ULONG CurrentCluster;
- ULONG FileOffset;
- ULONG FirstCluster;
- PVFATFCB Fcb;
- PVFATCCB pCcb;
- PVOID Temp;
- ULONG TempLength,Length2=Length;
-
- /* Locate the first cluster of the file */
- assert(FileObject);
- pCcb=(PVFATCCB)(FileObject->FsContext2);
- assert(pCcb);
- Fcb = pCcb->pFcb;
- assert(Fcb);
- if (DeviceExt->FatType == FAT32)
- CurrentCluster = Fcb->entry.FirstCluster+Fcb->entry.FirstClusterHigh*65536;
- else
- CurrentCluster = Fcb->entry.FirstCluster;
- FirstCluster=CurrentCluster;
- /* Allocate a buffer to hold 1 cluster of data */
+ ULONG CurrentCluster;
+ ULONG FirstCluster;
+ ULONG StartCluster;
+ ULONG Count;
+ PVFATFCB Fcb;
+ PVFATCCB pCcb;
+ ULONG TempLength;
+ LARGE_INTEGER SystemTime, LocalTime;
+ NTSTATUS Status;
+ BOOLEAN Extend;
+ LARGE_INTEGER FileOffset;
+
+ DPRINT ("VfatWriteFile(FileObject %x, Buffer %x, Length %x, "
+ "WriteOffset %x\n", FileObject, Buffer, Length, WriteOffset);
+
+ assert (FileObject);
+ pCcb = (PVFATCCB) (FileObject->FsContext2);
+ assert (pCcb);
+ Fcb = pCcb->pFcb;
+ assert (Fcb);
+
+// DPRINT1("%S\n", Fcb->PathName);
+
+ if (Length == 0)
+ {
+ return STATUS_SUCCESS;
+ }
+
+ // Is this a write to the FAT ?
+ if (Fcb->Flags & FCB_IS_FAT)
+ {
+ if (!NoCache && !PageIo)
+ {
+ DbgPrint ("Cached FAT write outside from VFATFS.SYS\n");
+ KeBugCheck (0);
+ }
+ if (WriteOffset >= Fcb->RFCB.FileSize.QuadPart || WriteOffset % BLOCKSIZE != 0 || Length % BLOCKSIZE != 0)
+ {
+ DbgPrint ("Start or end of FAT write is not on a sector boundary\n");
+ KeBugCheck (0);
+ }
+ if (WriteOffset + Length > (ULONG)Fcb->RFCB.FileSize.QuadPart)
+ {
+ Length = (ULONG)Fcb->RFCB.FileSize.QuadPart - WriteOffset;
+ }
+
+ for (Count = 0; Count < DeviceExt->Boot->FATCount; Count++)
+ {
+ Status = VfatWriteSectors(DeviceExt->StorageDevice,
+ DeviceExt->FATStart + (Count * (ULONG)Fcb->RFCB.FileSize.QuadPart + WriteOffset) / BLOCKSIZE,
+ Length / BLOCKSIZE, Buffer);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("FAT writing failed, Status %x\n", Status);
+ }
+ }
+ return Status;
+ }
+
+ /* Locate the first cluster of the file */
+ FirstCluster = CurrentCluster = vfatDirEntryGetFirstCluster (DeviceExt, &Fcb->entry);
+
+ if (PageIo)
+ {
+ if (FirstCluster == 0)
+ {
+ return STATUS_UNSUCCESSFUL;
+ }
+ }
+ else
+ {
+ if (FirstCluster == 1)
+ {
+ // root directory of FAT12 od FAT16
+ if (WriteOffset + Length > DeviceExt->rootDirectorySectors * BLOCKSIZE)
+ {
+ DPRINT("Writing over the end of the root directory on FAT12/16\n");
+ return STATUS_END_OF_FILE;
+ }
+ }
+
+ Status = vfatExtendSpace(DeviceExt, FileObject, WriteOffset + Length);
+ if (!NT_SUCCESS (Status))
+ {
+ return Status;
+ }
+ }
+
+ if (NoCache || PageIo)
+ {
+
+ FirstCluster = CurrentCluster = vfatDirEntryGetFirstCluster (DeviceExt, &Fcb->entry);
+ if (pCcb->LastCluster > 0 && WriteOffset > pCcb->LastOffset)
+ {
+ CurrentCluster = pCcb->LastCluster;
+ }
+ Status = OffsetToCluster(DeviceExt,
+ Fcb,
+ FirstCluster,
+ ROUND_DOWN(WriteOffset, DeviceExt->BytesPerCluster),
+ &CurrentCluster,
+ FALSE);
+ if (!NT_SUCCESS(Status) || CurrentCluster == 0xffffffff)
+ {
+ DPRINT1("????\n");
+ return(Status);
+ }
+ pCcb->LastCluster = CurrentCluster;
+ pCcb->LastOffset = ROUND_DOWN(WriteOffset, DeviceExt->BytesPerCluster);
+
+ /*
+ * If the offset in the cluster doesn't fall on the cluster boundary
+ * then we have to write only from the specified offset
+ */
+ Status = STATUS_SUCCESS;
+ if ((WriteOffset % DeviceExt->BytesPerCluster) != 0)
+ {
+ TempLength = min (Length, DeviceExt->BytesPerCluster - (WriteOffset % DeviceExt->BytesPerCluster));
+ Status = VfatWriteCluster(DeviceExt,
+ Fcb,
+ ROUND_DOWN(WriteOffset, DeviceExt->BytesPerCluster),
+ FirstCluster,
+ &CurrentCluster,
+ Buffer,
+ WriteOffset % DeviceExt->BytesPerCluster,
+ TempLength);
+ if (NT_SUCCESS(Status))
+ {
+ Buffer = Buffer + TempLength;
+ Length = Length - TempLength;
+ WriteOffset = WriteOffset + TempLength;
+ }
+ }
+
+ while (Length >= DeviceExt->BytesPerCluster && CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
+ {
+ StartCluster = CurrentCluster;
+ Count = 0;
+ // search for continous clusters
+ do
+ {
+ Count++;
+ Status = NextCluster(DeviceExt, Fcb, FirstCluster, &CurrentCluster, FALSE);
+ }
+ while (StartCluster + Count == CurrentCluster && NT_SUCCESS(Status) &&
+ Length - Count * DeviceExt->BytesPerCluster >= DeviceExt->BytesPerCluster);
+
+ pCcb->LastCluster = StartCluster + (Count - 1);
+ pCcb->LastOffset = WriteOffset + (Count - 1) * DeviceExt->BytesPerCluster;
+
+ Status = VfatRawWriteCluster(DeviceExt, FirstCluster, Buffer, StartCluster, Count);
+ if (NT_SUCCESS(Status))
+ {
+ Count *= DeviceExt->BytesPerCluster;
+ Buffer += Count;
+ Length -= Count;
+ WriteOffset += Count;
+ }
+ }
+
+ /* Write the remainder */
+ if (Length > 0 && CurrentCluster != 0xffffffff && NT_SUCCESS(Status))
+ {
+ Status = VfatWriteCluster(DeviceExt,
+ Fcb,
+ WriteOffset,
+ FirstCluster,
+ &CurrentCluster,
+ Buffer,
+ 0,
+ Length);
+ if (NT_SUCCESS(Status))
+ {
+ Length = 0;
+ }
+ }
+ if (NT_SUCCESS(Status) && Length)
+ {
+ if (WriteOffset < Fcb->RFCB.AllocationSize.QuadPart)
+ {
+ DPRINT1("%d %d\n", WriteOffset, (ULONG)Fcb->RFCB.AllocationSize.QuadPart);
+ Status = STATUS_DISK_FULL; // ???????????
+ }
+ }
+ }
+ else
+ {
+ // using the Cc-interface if possible
+ FileOffset.QuadPart = WriteOffset;
+ if(CcCopyWrite(FileObject, &FileOffset, Length, TRUE, Buffer))
+ {
+ Status = STATUS_SUCCESS;
+ }
+ else
+ {
+ Status = STATUS_UNSUCCESSFUL;
+ }
+ }
+
+
+ if (!PageIo)
+ {
+ if(!(Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY))
+ {
+ /* set dates and times */
+ KeQuerySystemTime (&SystemTime);
+ ExSystemTimeToLocalTime (&SystemTime, &LocalTime);
+ FsdFileTimeToDosDateTime ((TIME*)&LocalTime,
+ &Fcb->entry.UpdateDate,
+ &Fcb->entry.UpdateTime);
+ Fcb->entry.AccessDate = Fcb->entry.UpdateDate;
+ // update dates/times and length
+ updEntry (DeviceExt, FileObject);
+ }
+ }
+
+ return Status;
+}
+
+NTSTATUS vfatExtendSpace (PDEVICE_EXTENSION pDeviceExt, PFILE_OBJECT pFileObject, ULONG NewSize)
+{
+ ULONG FirstCluster;
+ ULONG CurrentCluster;
+ ULONG NewCluster;
+ NTSTATUS Status;
+ PVFATFCB pFcb;
- Temp = ExAllocatePool(NonPagedPool,DeviceExt->BytesPerCluster);
- assert(Temp);
- /* Find the cluster according to the offset in the file */
+ pFcb = ((PVFATCCB) (pFileObject->FsContext2))->pFcb;
- if (CurrentCluster==1)
- { //root of FAT16 or FAT12
- CurrentCluster=DeviceExt->rootStart+WriteOffset
- /DeviceExt->BytesPerCluster*DeviceExt->Boot->SectorsPerCluster;
+ DPRINT ("New Size %d, AllocationSize %d, BytesPerCluster %d\n", NewSize,
+ (ULONG)pFcb->RFCB.AllocationSize.QuadPart, pDeviceExt->BytesPerCluster);
+
+ FirstCluster = CurrentCluster = vfatDirEntryGetFirstCluster (pDeviceExt, &pFcb->entry);
+
+ if (NewSize > pFcb->RFCB.AllocationSize.QuadPart || FirstCluster==0)
+ {
+ // size on disk must be extended
+ if (FirstCluster == 0)
+ {
+ // file of size zero
+ Status = NextCluster (pDeviceExt, pFcb, FirstCluster, &CurrentCluster, TRUE);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("NextCluster failed, Status %x\n", Status);
+ return Status;
+ }
+ NewCluster = FirstCluster = CurrentCluster;
+ }
+ else
+ {
+ Status = OffsetToCluster(pDeviceExt, pFcb, FirstCluster,
+ pFcb->RFCB.AllocationSize.QuadPart - pDeviceExt->BytesPerCluster,
+ &CurrentCluster, FALSE);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("OffsetToCluster failed, Status %x\n", Status);
+ return Status;
+ }
+ if (CurrentCluster == 0xffffffff)
+ {
+ DPRINT1("Not enough disk space.\n");
+ return STATUS_DISK_FULL;
+ }
+ // CurrentCluster zeigt jetzt auf den letzten Cluster in der Kette
+ NewCluster = CurrentCluster;
+ Status = NextCluster(pDeviceExt, pFcb, FirstCluster, &NewCluster, FALSE);
+ if (NewCluster != 0xffffffff)
+ {
+ DPRINT1("Difference between size from direntry and the FAT.\n");
+ }
+ }
+
+ Status = OffsetToCluster(pDeviceExt, pFcb, FirstCluster,
+ ROUND_DOWN(NewSize-1, pDeviceExt->BytesPerCluster),
+ &NewCluster, TRUE);
+ if (!NT_SUCCESS(Status) || NewCluster == 0xffffffff)
+ {
+ DPRINT1("Not enough free space on disk\n");
+ if (pFcb->RFCB.AllocationSize.QuadPart > 0)
+ {
+ NewCluster = CurrentCluster;
+ // FIXME: check status
+ NextCluster(pDeviceExt, pFcb, FirstCluster, &NewCluster, FALSE);
+ WriteCluster(pDeviceExt, CurrentCluster, 0xffffffff);
+ }
+ // free the allocated space
+ while (NewCluster != 0xffffffff)
+ {
+ CurrentCluster = NewCluster;
+ // FIXME: check status
+ NextCluster (pDeviceExt, pFcb, FirstCluster, &NewCluster, FALSE);
+ WriteCluster (pDeviceExt, CurrentCluster, 0);
+ }
+ return STATUS_DISK_FULL;
+ }
+ if (pFcb->RFCB.AllocationSize.QuadPart == 0)
+ {
+ pFcb->entry.FirstCluster = FirstCluster;
+ if(pDeviceExt->FatType == FAT32)
+ pFcb->entry.FirstClusterHigh = FirstCluster >> 16;
+ }
+ pFcb->RFCB.AllocationSize.QuadPart = ROUND_UP(NewSize, pDeviceExt->BytesPerCluster);
+ if (pFcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY)
+ {
+ pFcb->RFCB.FileSize.QuadPart = pFcb->RFCB.AllocationSize.QuadPart;
+ pFcb->RFCB.ValidDataLength.QuadPart = pFcb->RFCB.AllocationSize.QuadPart;
+ }
+ else
+ {
+ pFcb->entry.FileSize = NewSize;
+ pFcb->RFCB.FileSize.QuadPart = NewSize;
+ pFcb->RFCB.ValidDataLength.QuadPart = NewSize;
+ }
+ CcSetFileSizes(pFileObject, (PCC_FILE_SIZES)&pFcb->RFCB.AllocationSize);
+ }
+ else
+ {
+ if (NewSize > pFcb->RFCB.FileSize.QuadPart)
+ {
+ // size on disk must not be extended
+ if (!(pFcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY))
+ {
+ pFcb->entry.FileSize = NewSize;
+ pFcb->RFCB.FileSize.QuadPart = NewSize;
+ CcSetFileSizes(pFileObject, (PCC_FILE_SIZES)&pFcb->RFCB.AllocationSize);
+ }
+ }
+ else
+ {
+ // nothing to do
+ }
+ }
+ return STATUS_SUCCESS;
+}
+
+NTSTATUS VfatRead(PVFAT_IRP_CONTEXT IrpContext)
+{
+ PVFATFCB Fcb;
+ PVFATCCB Ccb;
+ NTSTATUS Status = STATUS_SUCCESS;
+ ULONG ReadLength;
+ ULONG ReturnedReadLength = 0;
+ LARGE_INTEGER ReadOffset;
+ PVOID Buffer;
+
+ DPRINT ("VfatRead(IrpContext %x)\n", IrpContext);
+ assert (IrpContext);
+ Ccb = (PVFATCCB) IrpContext->FileObject->FsContext2;
+ assert (Ccb);
+ Fcb = Ccb->pFcb;
+ assert (Fcb);
+
+ if (IrpContext->Irp->Flags & IRP_PAGING_IO)
+ {
+ if (!ExAcquireResourceSharedLite(&Fcb->PagingIoResource, IrpContext->Flags & IRPCONTEXT_CANWAIT))
+ {
+ return VfatQueueRequest (IrpContext);
+ }
}
else
- if (CurrentCluster==0)
- {// file of size 0 : allocate first cluster
- CurrentCluster=GetNextWriteCluster(DeviceExt,0);
- if (DeviceExt->FatType == FAT32)
- {
- Fcb->entry.FirstClusterHigh=CurrentCluster>>16;
- Fcb->entry.FirstCluster=CurrentCluster;
- }
- else
- Fcb->entry.FirstCluster=CurrentCluster;
+ {
+ if (!ExAcquireResourceSharedLite(&Fcb->MainResource, IrpContext->Flags & IRPCONTEXT_CANWAIT))
+ {
+ return VfatQueueRequest (IrpContext);
+ }
}
- else
- for (FileOffset=0; FileOffset < WriteOffset / DeviceExt->BytesPerCluster; FileOffset++)
- {
- CurrentCluster = GetNextCluster(DeviceExt,CurrentCluster);
- }
- CHECKPOINT;
- /*
- If the offset in the cluster doesn't fall on the cluster boundary then
- we have to write only from the specified offset
- */
+ ReadLength = IrpContext->Stack->Parameters.Read.Length;
+ ReadOffset = IrpContext->Stack->Parameters.Read.ByteOffset;
+ Buffer = MmGetSystemAddressForMdl (IrpContext->Irp->MdlAddress);
- if ((WriteOffset % DeviceExt->BytesPerCluster)!=0)
+ /* fail if file is a directory and no paged read */
+ if (Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY && !(IrpContext->Irp->Flags & IRP_PAGING_IO))
{
- CHECKPOINT;
- TempLength = min(Length,DeviceExt->BytesPerCluster -
- (WriteOffset % DeviceExt->BytesPerCluster));
- /* Read in the existing cluster data */
- if (FirstCluster==1)
- VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Temp);
- else
- VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
-
- /* Overwrite the last parts of the data as necessary */
- memcpy(Temp + (WriteOffset % DeviceExt->BytesPerCluster), Buffer,
- TempLength);
-
- /* Write the cluster back */
- if (FirstCluster==1)
- {
- VFATWriteSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Temp);
- CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
- }
- else
- {
- VFATWriteCluster(DeviceExt,Temp,CurrentCluster);
- CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
- }
- Length2 -= TempLength;
- Buffer = Buffer + TempLength;
+ Status = STATUS_FILE_IS_A_DIRECTORY;
}
- CHECKPOINT;
-
- /* Write the buffer in chunks of 1 cluster */
-
- while (Length2 >= DeviceExt->BytesPerCluster)
+ else
{
- CHECKPOINT;
- if (CurrentCluster == 0)
- {
- ExFreePool(Temp);
- return(STATUS_UNSUCCESSFUL);
- }
- if (FirstCluster==1)
- {
- VFATWriteSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Buffer);
- CurrentCluster += DeviceExt->Boot->SectorsPerCluster;
- }
- else
- {
- VFATWriteCluster(DeviceExt,Buffer,CurrentCluster);
- CurrentCluster = GetNextCluster(DeviceExt, CurrentCluster);
- }
- Buffer = Buffer + DeviceExt->BytesPerCluster;
- Length2 -= DeviceExt->BytesPerCluster;
+ Status = VfatReadFile (IrpContext->DeviceExt, IrpContext->FileObject,
+ Buffer, ReadLength, ReadOffset.u.LowPart, &ReturnedReadLength,
+ IrpContext->FileObject->Flags & FO_NO_INTERMEDIATE_BUFFERING
+ || IrpContext->Irp->Flags & IRP_PAGING_IO);
}
- CHECKPOINT;
- /* Write the remainder */
+ if (IrpContext->Irp->Flags & IRP_PAGING_IO)
+ {
+ ExReleaseResourceLite(&Fcb->PagingIoResource);
+ }
+ else
+ {
+ ExReleaseResourceLite(&Fcb->MainResource);
+ }
- if (Length2 > 0)
+ if (NT_SUCCESS(Status))
{
- CHECKPOINT;
- if (CurrentCluster == 0)
- {
- ExFreePool(Temp);
- return(STATUS_UNSUCCESSFUL);
- }
- CHECKPOINT;
- /* Read in the existing cluster data */
- if (FirstCluster==1)
- VFATReadSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Temp);
- else
- VFATLoadCluster(DeviceExt,Temp,CurrentCluster);
- CHECKPOINT;
- memcpy(Temp, Buffer, Length2);
- CHECKPOINT;
- if (FirstCluster==1)
- {
- VFATWriteSectors(DeviceExt->StorageDevice,CurrentCluster
- ,DeviceExt->Boot->SectorsPerCluster,Temp);
- }
- else
- VFATWriteCluster(DeviceExt,Temp,CurrentCluster);
+ if (IrpContext->FileObject->Flags & FO_SYNCHRONOUS_IO && !(IrpContext->Irp->Flags & IRP_PAGING_IO))
+ {
+ IrpContext->FileObject->CurrentByteOffset.QuadPart = ReadOffset.QuadPart + ReturnedReadLength;
+ }
+ IrpContext->Irp->IoStatus.Information = ReturnedReadLength;
}
- CHECKPOINT;
-//FIXME : set last write time and date
- if(Fcb->entry.FileSize<WriteOffset+Length
- && !(Fcb->entry.Attrib &FILE_ATTRIBUTE_DIRECTORY))
+ else
{
- Fcb->entry.FileSize=WriteOffset+Length;
- // update entry in directory
- updEntry(DeviceExt,FileObject);
+ IrpContext->Irp->IoStatus.Information = 0;
}
- ExFreePool(Temp);
- return(STATUS_SUCCESS);
+
+ IrpContext->Irp->IoStatus.Status = Status;
+ IoCompleteRequest (IrpContext->Irp, IO_NO_INCREMENT);
+ VfatFreeIrpContext (IrpContext);
+
+ return Status;
}
-NTSTATUS FsdWrite(PDEVICE_OBJECT DeviceObject, PIRP Irp)
-/*
- * FUNCTION: Write to a file
- */
+NTSTATUS VfatWrite(PVFAT_IRP_CONTEXT IrpContext)
{
- ULONG Length;
+ PVFATFCB Fcb;
+ PVFATCCB Ccb;
+ NTSTATUS Status = STATUS_SUCCESS;
+ ULONG WriteLength;
+ LARGE_INTEGER WriteOffset;
PVOID Buffer;
- ULONG Offset;
- PIO_STACK_LOCATION Stack = IoGetCurrentIrpStackLocation(Irp);
- PFILE_OBJECT FileObject = Stack->FileObject;
- PDEVICE_EXTENSION DeviceExt = DeviceObject->DeviceExtension;
- NTSTATUS Status;
-
- DPRINT("FsdWrite(DeviceObject %x Irp %x)\n",DeviceObject,Irp);
- Length = Stack->Parameters.Write.Length;
- Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
- Offset = Stack->Parameters.Write.ByteOffset.u.LowPart;
+ DPRINT ("VfatWrite(), %S\n", ((PVFATCCB) IrpContext->FileObject->FsContext2)->pFcb->FileName);
+ assert (IrpContext);
+ Ccb = (PVFATCCB) IrpContext->FileObject->FsContext2;
+ assert (Ccb);
+ Fcb = Ccb->pFcb;
+ assert (Fcb);
- Status = FsdWriteFile(DeviceExt,FileObject,Buffer,Length,Offset);
+ if (IrpContext->Irp->Flags & IRP_PAGING_IO)
+ {
+ if (!ExAcquireResourceExclusiveLite(&Fcb->PagingIoResource, IrpContext->Flags & IRPCONTEXT_CANWAIT))
+ {
+ return VfatQueueRequest (IrpContext);
+ }
+ }
+ else
+ {
+ if (!ExAcquireResourceExclusiveLite(&Fcb->MainResource, IrpContext->Flags & IRPCONTEXT_CANWAIT))
+ {
+ return VfatQueueRequest (IrpContext);
+ }
+ }
- Irp->IoStatus.Status = Status;
- Irp->IoStatus.Information = Length;
- IoCompleteRequest(Irp,IO_NO_INCREMENT);
+ WriteLength = IrpContext->Stack->Parameters.Write.Length;
+ WriteOffset = IrpContext->Stack->Parameters.Write.ByteOffset;
+ Buffer = MmGetSystemAddressForMdl (IrpContext->Irp->MdlAddress);
- return(Status);
-}
+ /* fail if file is a directory and no paged read */
+ if (Fcb->entry.Attrib & FILE_ATTRIBUTE_DIRECTORY && !(IrpContext->Irp->Flags & IRP_PAGING_IO))
+ {
+ Status = STATUS_FILE_IS_A_DIRECTORY;
+ }
+ else
+ {
+ Status = VfatWriteFile (IrpContext->DeviceExt, IrpContext->FileObject,
+ Buffer, WriteLength, WriteOffset.u.LowPart,
+ IrpContext->FileObject->Flags & FO_NO_INTERMEDIATE_BUFFERING,
+ IrpContext->Irp->Flags & IRP_PAGING_IO);
+ }
-NTSTATUS FsdRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
-/*
- * FUNCTION: Read from a file
- */
-{
- ULONG Length;
- PVOID Buffer;
- ULONG Offset;
- PIO_STACK_LOCATION Stack;
- PFILE_OBJECT FileObject;
- PDEVICE_EXTENSION DeviceExt;
- NTSTATUS Status;
- ULONG LengthRead;
-
- DPRINT("FsdRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
-
- /* Precondition / Initialization */
- assert(Irp != NULL);
- Stack = IoGetCurrentIrpStackLocation(Irp);
- assert(Stack != NULL);
- FileObject = Stack->FileObject;
- assert(FileObject != NULL);
- DeviceExt = DeviceObject->DeviceExtension;
- assert(DeviceExt != NULL);
-
- Length = Stack->Parameters.Read.Length;
- Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
- Offset = Stack->Parameters.Read.ByteOffset.u.LowPart;
-
- Status = FsdReadFile(DeviceExt,FileObject,Buffer,Length,Offset,
- &LengthRead);
-
- Irp->IoStatus.Status = Status;
- Irp->IoStatus.Information = LengthRead;
- IoCompleteRequest(Irp,IO_NO_INCREMENT);
-
- return(Status);
+ if (IrpContext->Irp->Flags & IRP_PAGING_IO)
+ {
+ ExReleaseResourceLite(&Fcb->PagingIoResource);
+ }
+ else
+ {
+ ExReleaseResourceLite(&Fcb->MainResource);
+ }
+
+ if (NT_SUCCESS(Status))
+ {
+ if (IrpContext->FileObject->Flags & FO_SYNCHRONOUS_IO && !(IrpContext->Irp->Flags & IRP_PAGING_IO))
+ {
+ IrpContext->FileObject->CurrentByteOffset.QuadPart = WriteOffset.QuadPart + WriteLength;
+ }
+ IrpContext->Irp->IoStatus.Information = WriteLength;
+ }
+ else
+ {
+ IrpContext->Irp->IoStatus.Information = 0;
+ }
+
+ IrpContext->Irp->IoStatus.Status = Status;
+ IoCompleteRequest (IrpContext->Irp, IO_NO_INCREMENT);
+ VfatFreeIrpContext (IrpContext);
+ return Status;
}
projects / reactos.git / blobdiff