/*
- * COPYRIGHT: See COPYING in the top level directory
- * PROJECT: ReactOS kernel
- * FILE: drivers/fs/vfat/rw.c
- * PURPOSE: VFAT Filesystem
- * PROGRAMMER: Jason Filby (jasonfilby@yahoo.com)
- *
+ * PROJECT: ReactOS FAT file system driver
+ * LICENSE: GPL - See COPYING in the top level directory
+ * FILE: drivers/filesystems/fastfat/rw.c
+ * PURPOSE: Read/write support
+ * PROGRAMMERS: Aleksey Bragin (aleksey@reactos.org)
+ * Alexey Vlasov
*/
/* INCLUDES *****************************************************************/
#define NDEBUG
-#include "vfat.h"
-
-/*
- * Uncomment to enable strict verification of cluster/offset pair
- * caching. If this option is enabled you lose all the benefits of
- * the caching and the read/write operations will actually be
- * slower. It's meant only for debugging!!!
- * - Filip Navara, 26/07/2004
- */
-/* #define DEBUG_VERIFY_OFFSET_CACHING */
+#include "fastfat.h"
/* FUNCTIONS *****************************************************************/
NTSTATUS
-NextCluster(PDEVICE_EXTENSION DeviceExt,
- ULONG FirstCluster,
- PULONG CurrentCluster,
- BOOLEAN Extend)
- /*
- * Return the next cluster in a FAT chain, possibly extending the chain if
- * necessary
- */
+NTAPI
+FatiRead(PFAT_IRP_CONTEXT IrpContext)
{
- if (FirstCluster == 1)
- {
- (*CurrentCluster) += DeviceExt->FatInfo.SectorsPerCluster;
- return(STATUS_SUCCESS);
- }
- else
+ ULONG NumberOfBytes;
+ LARGE_INTEGER ByteOffset;
+ PFILE_OBJECT FileObject;
+ TYPE_OF_OPEN OpenType;
+ PIO_STACK_LOCATION IrpSp = IrpContext->Stack;
+ PFCB Fcb;
+ PVCB Vcb;
+ PCCB Ccb;
+ PVOID Buffer;
+ LONG BytesRead;
+
+ FileObject = IrpSp->FileObject;
+ NumberOfBytes = IrpSp->Parameters.Read.Length;
+ ByteOffset = IrpSp->Parameters.Read.ByteOffset;
+ if (NumberOfBytes == 0)
{
- if (Extend)
- return GetNextClusterExtend(DeviceExt, (*CurrentCluster), CurrentCluster);
- else
- return GetNextCluster(DeviceExt, (*CurrentCluster), CurrentCluster);
+ FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
+ return STATUS_SUCCESS;
}
-}
+
+ OpenType = FatDecodeFileObject(FileObject, &Vcb, &Fcb, &Ccb);
-NTSTATUS
-OffsetToCluster(PDEVICE_EXTENSION DeviceExt,
- 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");
- ASSERT(FALSE);
- }
+ DPRINT1("FatiRead() Fcb %p, Name %wZ, Offset %d, Length %d, Handle %p\n",
+ Fcb, &FileObject->FileName, ByteOffset.LowPart, NumberOfBytes, Fcb->FatHandle);
- if (FirstCluster == 1)
- {
- /* root of FAT16 or FAT12 */
- *Cluster = DeviceExt->FatInfo.rootStart + FileOffset
- / (DeviceExt->FatInfo.BytesPerCluster) * DeviceExt->FatInfo.SectorsPerCluster;
- return(STATUS_SUCCESS);
- }
- else
- {
- CurrentCluster = FirstCluster;
- if (Extend)
- {
- for (i = 0; i < FileOffset / DeviceExt->FatInfo.BytesPerCluster; i++)
- {
- Status = GetNextClusterExtend (DeviceExt, CurrentCluster, &CurrentCluster);
- if (!NT_SUCCESS(Status))
- return(Status);
- }
- *Cluster = CurrentCluster;
- }
- else
- {
- for (i = 0; i < FileOffset / DeviceExt->FatInfo.BytesPerCluster; i++)
- {
- Status = GetNextCluster (DeviceExt, CurrentCluster, &CurrentCluster);
- if (!NT_SUCCESS(Status))
- return(Status);
- }
- *Cluster = CurrentCluster;
- }
- return(STATUS_SUCCESS);
- }
-}
+ /* Perform actual read */
-static NTSTATUS
-VfatReadFileData (PVFAT_IRP_CONTEXT IrpContext,
- ULONG Length,
- LARGE_INTEGER ReadOffset,
- PULONG LengthRead)
-/*
- * FUNCTION: Reads data from a file
- */
-{
- ULONG CurrentCluster;
- ULONG FirstCluster;
- ULONG StartCluster;
- ULONG ClusterCount;
- LARGE_INTEGER StartOffset;
- PDEVICE_EXTENSION DeviceExt;
- BOOLEAN First = TRUE;
- PVFATFCB Fcb;
- PVFATCCB Ccb;
- NTSTATUS Status;
- ULONG BytesDone;
- ULONG BytesPerSector;
- ULONG BytesPerCluster;
- ULONG LastCluster;
- ULONG LastOffset;
-
- /* PRECONDITION */
- ASSERT(IrpContext);
- DeviceExt = IrpContext->DeviceExt;
- ASSERT(DeviceExt);
- ASSERT(DeviceExt->FatInfo.BytesPerCluster);
- ASSERT(IrpContext->FileObject);
- ASSERT(IrpContext->FileObject->FsContext2 != NULL);
-
- DPRINT("VfatReadFileData(DeviceExt %p, FileObject %p, "
- "Length %d, ReadOffset 0x%I64x)\n", DeviceExt,
- IrpContext->FileObject, Length, ReadOffset.QuadPart);
-
- *LengthRead = 0;
-
- Ccb = (PVFATCCB)IrpContext->FileObject->FsContext2;
- Fcb = IrpContext->FileObject->FsContext;
- BytesPerSector = DeviceExt->FatInfo.BytesPerSector;
- BytesPerCluster = DeviceExt->FatInfo.BytesPerCluster;
-
- ASSERT(ReadOffset.QuadPart + Length <= ROUND_UP(Fcb->RFCB.FileSize.QuadPart, BytesPerSector));
- ASSERT(ReadOffset.u.LowPart % BytesPerSector == 0);
- ASSERT(Length % BytesPerSector == 0);
-
- /* Is this a read of the FAT? */
- if (Fcb->Flags & FCB_IS_FAT)
- {
- ReadOffset.QuadPart += DeviceExt->FatInfo.FATStart * BytesPerSector;
- Status = VfatReadDiskPartial(IrpContext, &ReadOffset, Length, 0, TRUE);
-
- if (NT_SUCCESS(Status))
+ if (IrpContext->MinorFunction & IRP_MN_MDL)
{
- *LengthRead = Length;
+ DPRINT1("MDL read\n");
}
else
{
- DPRINT1("FAT reading failed, Status %x\n", Status);
- }
- return Status;
- }
- /* Is this a read of the Volume ? */
- if (Fcb->Flags & FCB_IS_VOLUME)
- {
- Status = VfatReadDiskPartial(IrpContext, &ReadOffset, Length, 0, TRUE);
- if (NT_SUCCESS(Status))
- {
- *LengthRead = Length;
- }
- else
- {
- DPRINT1("Volume reading failed, Status %x\n", Status);
- }
- return Status;
- }
-
- /*
- * Find the first cluster
- */
- FirstCluster = CurrentCluster =
- vfatDirEntryGetFirstCluster (DeviceExt, &Fcb->entry);
-
- if (FirstCluster == 1)
- {
- // Directory of FAT12/16 needs a special handling
- if (ReadOffset.u.LowPart + Length > DeviceExt->FatInfo.rootDirectorySectors * BytesPerSector)
- {
- Length = DeviceExt->FatInfo.rootDirectorySectors * BytesPerSector - ReadOffset.u.LowPart;
- }
- ReadOffset.u.LowPart += DeviceExt->FatInfo.rootStart * BytesPerSector;
+ Buffer = FatMapUserBuffer(IrpContext->Irp);
+ DPRINT1("Normal cached read, buffer %p\n");
- // Fire up the read command
+ /* Set offset */
+ FF_Seek(Fcb->FatHandle, ByteOffset.LowPart, FF_SEEK_SET);
- Status = VfatReadDiskPartial (IrpContext, &ReadOffset, Length, 0, TRUE);
- if (NT_SUCCESS(Status))
- {
- *LengthRead = Length;
- }
- return Status;
- }
+ /* Read */
+ BytesRead = FF_Read(Fcb->FatHandle, NumberOfBytes, 1, Buffer);
+ DPRINT1("Read %d bytes\n", BytesRead);
- ExAcquireFastMutex(&Fcb->LastMutex);
- LastCluster = Fcb->LastCluster;
- LastOffset = Fcb->LastOffset;
- ExReleaseFastMutex(&Fcb->LastMutex);
-
- /*
- * Find the cluster to start the read from
- */
- if (LastCluster > 0 && ReadOffset.u.LowPart >= LastOffset)
- {
- Status = OffsetToCluster(DeviceExt, LastCluster,
- ROUND_DOWN(ReadOffset.u.LowPart, BytesPerCluster) -
- LastOffset,
- &CurrentCluster, FALSE);
-#ifdef DEBUG_VERIFY_OFFSET_CACHING
- /* DEBUG VERIFICATION */
- {
- ULONG CorrectCluster;
- OffsetToCluster(DeviceExt, FirstCluster,
- ROUND_DOWN(ReadOffset.u.LowPart, BytesPerCluster),
- &CorrectCluster, FALSE);
- if (CorrectCluster != CurrentCluster)
- KeBugCheck(FAT_FILE_SYSTEM);
+ /* Indicate we read requested amount of bytes */
+ IrpContext->Irp->IoStatus.Information = BytesRead;
+ IrpContext->Irp->IoStatus.Status = STATUS_SUCCESS;
}
-#endif
- }
- else
- {
- Status = OffsetToCluster(DeviceExt, FirstCluster,
- ROUND_DOWN(ReadOffset.u.LowPart, BytesPerCluster),
- &CurrentCluster, FALSE);
- }
- if (!NT_SUCCESS(Status))
- {
- return(Status);
- }
-
- ExAcquireFastMutex(&Fcb->LastMutex);
- Fcb->LastCluster = CurrentCluster;
- Fcb->LastOffset = ROUND_DOWN (ReadOffset.u.LowPart, BytesPerCluster);
- ExReleaseFastMutex(&Fcb->LastMutex);
-
- KeInitializeEvent(&IrpContext->Event, NotificationEvent, FALSE);
- IrpContext->RefCount = 1;
-
- while (Length > 0 && CurrentCluster != 0xffffffff)
- {
- StartCluster = CurrentCluster;
- StartOffset.QuadPart = ClusterToSector(DeviceExt, StartCluster) * BytesPerSector;
- BytesDone = 0;
- ClusterCount = 0;
-
- do
- {
- ClusterCount++;
- if (First)
- {
- BytesDone = min (Length, BytesPerCluster - (ReadOffset.u.LowPart % BytesPerCluster));
- StartOffset.QuadPart += ReadOffset.u.LowPart % BytesPerCluster;
- First = FALSE;
- }
- else
- {
- if (Length - BytesDone > BytesPerCluster)
- {
- BytesDone += BytesPerCluster;
- }
- else
- {
- BytesDone = Length;
- }
- }
- Status = NextCluster(DeviceExt, FirstCluster, &CurrentCluster, FALSE);
- }
- while (StartCluster + ClusterCount == CurrentCluster && NT_SUCCESS(Status) && Length > BytesDone);
- DPRINT("start %08x, next %08x, count %d\n",
- StartCluster, CurrentCluster, ClusterCount);
-
- ExAcquireFastMutex(&Fcb->LastMutex);
- Fcb->LastCluster = StartCluster + (ClusterCount - 1);
- Fcb->LastOffset = ROUND_DOWN(ReadOffset.u.LowPart, BytesPerCluster) + (ClusterCount - 1) * BytesPerCluster;
- ExReleaseFastMutex(&Fcb->LastMutex);
-
- // Fire up the read command
- Status = VfatReadDiskPartial (IrpContext, &StartOffset, BytesDone, *LengthRead, FALSE);
- if (!NT_SUCCESS(Status) && Status != STATUS_PENDING)
- {
- break;
- }
- *LengthRead += BytesDone;
- Length -= BytesDone;
- ReadOffset.u.LowPart += BytesDone;
- }
- if (0 != InterlockedDecrement((PLONG)&IrpContext->RefCount))
- {
- KeWaitForSingleObject(&IrpContext->Event, Executive, KernelMode, FALSE, NULL);
- }
- if (NT_SUCCESS(Status) || Status == STATUS_PENDING)
- {
- if (Length > 0)
- {
- Status = STATUS_UNSUCCESSFUL;
- }
- else
- {
- Status = IrpContext->Irp->IoStatus.Status;
- }
- }
- return Status;
-}
-
-static NTSTATUS
-VfatWriteFileData(PVFAT_IRP_CONTEXT IrpContext,
- ULONG Length,
- LARGE_INTEGER WriteOffset)
-{
- PDEVICE_EXTENSION DeviceExt;
- PVFATFCB Fcb;
- PVFATCCB Ccb;
- ULONG Count;
- ULONG FirstCluster;
- ULONG CurrentCluster;
- ULONG BytesDone;
- ULONG StartCluster;
- ULONG ClusterCount;
- NTSTATUS Status = STATUS_SUCCESS;
- BOOLEAN First = TRUE;
- ULONG BytesPerSector;
- ULONG BytesPerCluster;
- LARGE_INTEGER StartOffset;
- ULONG BufferOffset;
- ULONG LastCluster;
- ULONG LastOffset;
-
- /* PRECONDITION */
- ASSERT(IrpContext);
- DeviceExt = IrpContext->DeviceExt;
- ASSERT(DeviceExt);
- ASSERT(DeviceExt->FatInfo.BytesPerCluster);
- ASSERT(IrpContext->FileObject);
- ASSERT(IrpContext->FileObject->FsContext2 != NULL);
-
- Ccb = (PVFATCCB)IrpContext->FileObject->FsContext2;
- Fcb = IrpContext->FileObject->FsContext;
- BytesPerCluster = DeviceExt->FatInfo.BytesPerCluster;
- BytesPerSector = DeviceExt->FatInfo.BytesPerSector;
-
- DPRINT("VfatWriteFileData(DeviceExt %p, FileObject %p, "
- "Length %d, WriteOffset 0x%I64x), '%wZ'\n", DeviceExt,
- IrpContext->FileObject, Length, WriteOffset,
- &Fcb->PathNameU);
-
- ASSERT(WriteOffset.QuadPart + Length <= Fcb->RFCB.AllocationSize.QuadPart);
- ASSERT(WriteOffset.u.LowPart % BytesPerSector == 0);
- ASSERT(Length % BytesPerSector == 0);
-
- // Is this a write of the volume ?
- if (Fcb->Flags & FCB_IS_VOLUME)
- {
- Status = VfatWriteDiskPartial(IrpContext, &WriteOffset, Length, 0, TRUE);
- if (!NT_SUCCESS(Status))
- {
- DPRINT1("Volume writing failed, Status %x\n", Status);
- }
- return Status;
- }
-
- // Is this a write to the FAT ?
- if (Fcb->Flags & FCB_IS_FAT)
- {
- WriteOffset.u.LowPart += DeviceExt->FatInfo.FATStart * BytesPerSector;
- IrpContext->RefCount = 1;
- for (Count = 0; Count < DeviceExt->FatInfo.FATCount; Count++)
- {
- Status = VfatWriteDiskPartial(IrpContext, &WriteOffset, Length, 0, FALSE);
- if (!NT_SUCCESS(Status) && Status != STATUS_PENDING)
- {
- DPRINT1("FAT writing failed, Status %x\n", Status);
- break;
- }
- WriteOffset.u.LowPart += Fcb->RFCB.FileSize.u.LowPart;
- }
- if (0 != InterlockedDecrement((PLONG)&IrpContext->RefCount))
- {
- KeWaitForSingleObject(&IrpContext->Event, Executive, KernelMode, FALSE, NULL);
- }
- if (NT_SUCCESS(Status) || Status == STATUS_PENDING)
- {
- Status = IrpContext->Irp->IoStatus.Status;
- }
- return Status;
- }
-
- /*
- * Find the first cluster
- */
- FirstCluster = CurrentCluster =
- vfatDirEntryGetFirstCluster (DeviceExt, &Fcb->entry);
-
- if (FirstCluster == 1)
- {
- ASSERT(WriteOffset.u.LowPart + Length <= DeviceExt->FatInfo.rootDirectorySectors * BytesPerSector);
- // Directory of FAT12/16 needs a special handling
- WriteOffset.u.LowPart += DeviceExt->FatInfo.rootStart * BytesPerSector;
- // Fire up the write command
- Status = VfatWriteDiskPartial (IrpContext, &WriteOffset, Length, 0, TRUE);
- return Status;
- }
-
- ExAcquireFastMutex(&Fcb->LastMutex);
- LastCluster = Fcb->LastCluster;
- LastOffset = Fcb->LastOffset;
- ExReleaseFastMutex(&Fcb->LastMutex);
-
- /*
- * Find the cluster to start the write from
- */
- if (LastCluster > 0 && WriteOffset.u.LowPart >= LastOffset)
- {
- Status = OffsetToCluster(DeviceExt, LastCluster,
- ROUND_DOWN(WriteOffset.u.LowPart, BytesPerCluster) -
- LastOffset,
- &CurrentCluster, FALSE);
-#ifdef DEBUG_VERIFY_OFFSET_CACHING
- /* DEBUG VERIFICATION */
- {
- ULONG CorrectCluster;
- OffsetToCluster(DeviceExt, FirstCluster,
- ROUND_DOWN(WriteOffset.u.LowPart, BytesPerCluster),
- &CorrectCluster, FALSE);
- if (CorrectCluster != CurrentCluster)
- KeBugCheck(FAT_FILE_SYSTEM);
- }
-#endif
- }
- else
- {
- Status = OffsetToCluster(DeviceExt, FirstCluster,
- ROUND_DOWN(WriteOffset.u.LowPart, BytesPerCluster),
- &CurrentCluster, FALSE);
- }
-
- if (!NT_SUCCESS(Status))
- {
- return(Status);
- }
-
- ExAcquireFastMutex(&Fcb->LastMutex);
- Fcb->LastCluster = CurrentCluster;
- Fcb->LastOffset = ROUND_DOWN (WriteOffset.u.LowPart, BytesPerCluster);
- ExReleaseFastMutex(&Fcb->LastMutex);
-
- IrpContext->RefCount = 1;
- BufferOffset = 0;
-
- while (Length > 0 && CurrentCluster != 0xffffffff)
- {
- StartCluster = CurrentCluster;
- StartOffset.QuadPart = ClusterToSector(DeviceExt, StartCluster) * BytesPerSector;
- BytesDone = 0;
- ClusterCount = 0;
- do
- {
- ClusterCount++;
- if (First)
- {
- BytesDone = min (Length, BytesPerCluster - (WriteOffset.u.LowPart % BytesPerCluster));
- StartOffset.QuadPart += WriteOffset.u.LowPart % BytesPerCluster;
- First = FALSE;
- }
- else
- {
- if (Length - BytesDone > BytesPerCluster)
- {
- BytesDone += BytesPerCluster;
- }
- else
- {
- BytesDone = Length;
- }
- }
- Status = NextCluster(DeviceExt, FirstCluster, &CurrentCluster, FALSE);
- }
- while (StartCluster + ClusterCount == CurrentCluster && NT_SUCCESS(Status) && Length > BytesDone);
- DPRINT("start %08x, next %08x, count %d\n",
- StartCluster, CurrentCluster, ClusterCount);
-
- ExAcquireFastMutex(&Fcb->LastMutex);
- Fcb->LastCluster = StartCluster + (ClusterCount - 1);
- Fcb->LastOffset = ROUND_DOWN(WriteOffset.u.LowPart, BytesPerCluster) + (ClusterCount - 1) * BytesPerCluster;
- ExReleaseFastMutex(&Fcb->LastMutex);
-
- // Fire up the write command
- Status = VfatWriteDiskPartial (IrpContext, &StartOffset, BytesDone, BufferOffset, FALSE);
- if (!NT_SUCCESS(Status) && Status != STATUS_PENDING)
- {
- break;
- }
- BufferOffset += BytesDone;
- Length -= BytesDone;
- WriteOffset.u.LowPart += BytesDone;
- }
- if (0 != InterlockedDecrement((PLONG)&IrpContext->RefCount))
- {
- KeWaitForSingleObject(&IrpContext->Event, Executive, KernelMode, FALSE, NULL);
- }
- if (NT_SUCCESS(Status) || Status == STATUS_PENDING)
- {
- if (Length > 0)
- {
- Status = STATUS_UNSUCCESSFUL;
- }
- else
- {
- Status = IrpContext->Irp->IoStatus.Status;
- }
- }
- return Status;
+ /* Complete the request */
+ FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
+ return STATUS_SUCCESS;
}
NTSTATUS
-VfatRead(PVFAT_IRP_CONTEXT IrpContext)
+NTAPI
+FatRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
- NTSTATUS Status;
- PVFATFCB Fcb;
- ULONG Length = 0;
- ULONG ReturnedLength = 0;
- PERESOURCE Resource = NULL;
- LARGE_INTEGER ByteOffset;
- PVOID Buffer;
- PDEVICE_OBJECT DeviceToVerify;
- ULONG BytesPerSector;
-
- ASSERT(IrpContext);
-
- DPRINT("VfatRead(IrpContext %p)\n", IrpContext);
-
- ASSERT(IrpContext->DeviceObject);
-
- // This request is not allowed on the main device object
- if (IrpContext->DeviceObject == VfatGlobalData->DeviceObject)
- {
- DPRINT("VfatRead is called with the main device object.\n");
- Status = STATUS_INVALID_DEVICE_REQUEST;
- goto ByeBye;
- }
-
- ASSERT(IrpContext->DeviceExt);
- ASSERT(IrpContext->FileObject);
- Fcb = IrpContext->FileObject->FsContext;
- ASSERT(Fcb);
+ NTSTATUS Status;
+ BOOLEAN TopLevel, CanWait;
+ PFAT_IRP_CONTEXT IrpContext;
- DPRINT("<%wZ>\n", &Fcb->PathNameU);
+ CanWait = TRUE;
+ TopLevel = FALSE;
+ Status = STATUS_INVALID_DEVICE_REQUEST;
+ /* Get CanWait flag */
+ if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
+ CanWait = IoIsOperationSynchronous(Irp);
- if (Fcb->Flags & FCB_IS_PAGE_FILE)
- {
- PFATINFO FatInfo = &IrpContext->DeviceExt->FatInfo;
- IrpContext->Stack->Parameters.Read.ByteOffset.QuadPart += FatInfo->dataStart * FatInfo->BytesPerSector;
- IoSkipCurrentIrpStackLocation(IrpContext->Irp);
- DPRINT("Read from page file, disk offset %I64x\n", IrpContext->Stack->Parameters.Read.ByteOffset.QuadPart);
- Status = IoCallDriver(IrpContext->DeviceExt->StorageDevice, IrpContext->Irp);
- VfatFreeIrpContext(IrpContext);
- return Status;
- }
+ /* Enter FsRtl critical region */
+ FsRtlEnterFileSystem();
- ByteOffset = IrpContext->Stack->Parameters.Read.ByteOffset;
- Length = IrpContext->Stack->Parameters.Read.Length;
- BytesPerSector = IrpContext->DeviceExt->FatInfo.BytesPerSector;
-
- /* fail if file is a directory and no paged read */
- if (*Fcb->Attributes & FILE_ATTRIBUTE_DIRECTORY && !(IrpContext->Irp->Flags & IRP_PAGING_IO))
- {
- Status = STATUS_INVALID_PARAMETER;
- goto ByeBye;
- }
-
-
- DPRINT("'%wZ', Offset: %d, Length %d\n", &Fcb->PathNameU, ByteOffset.u.LowPart, Length);
-
- if (ByteOffset.u.HighPart && !(Fcb->Flags & FCB_IS_VOLUME))
- {
- Status = STATUS_INVALID_PARAMETER;
- goto ByeBye;
- }
- if (ByteOffset.QuadPart >= Fcb->RFCB.FileSize.QuadPart)
- {
- IrpContext->Irp->IoStatus.Information = 0;
- Status = STATUS_END_OF_FILE;
- goto ByeBye;
- }
- if (IrpContext->Irp->Flags & (IRP_PAGING_IO | IRP_NOCACHE) || (Fcb->Flags & FCB_IS_VOLUME))
- {
- if (ByteOffset.u.LowPart % BytesPerSector != 0 || Length % BytesPerSector != 0)
- {
- DPRINT("%d %d\n", ByteOffset.u.LowPart, Length);
- // non cached read must be sector aligned
- Status = STATUS_INVALID_PARAMETER;
- goto ByeBye;
- }
- }
- if (Length == 0)
- {
- IrpContext->Irp->IoStatus.Information = 0;
- Status = STATUS_SUCCESS;
- goto ByeBye;
- }
-
- if (Fcb->Flags & FCB_IS_VOLUME)
- {
- Resource = &IrpContext->DeviceExt->DirResource;
- }
- else if (IrpContext->Irp->Flags & IRP_PAGING_IO)
- {
- Resource = &Fcb->PagingIoResource;
- }
- else
- {
- Resource = &Fcb->MainResource;
- }
- if (!ExAcquireResourceSharedLite(Resource,
- IrpContext->Flags & IRPCONTEXT_CANWAIT ? TRUE : FALSE))
- {
- Resource = NULL;
- Status = STATUS_PENDING;
- goto ByeBye;
- }
-
- if (!(IrpContext->Irp->Flags & IRP_PAGING_IO) &&
- FsRtlAreThereCurrentFileLocks(&Fcb->FileLock))
- {
- if (!FsRtlCheckLockForReadAccess(&Fcb->FileLock, IrpContext->Irp))
- {
- Status = STATUS_FILE_LOCK_CONFLICT;
- goto ByeBye;
- }
- }
-
- Buffer = VfatGetUserBuffer(IrpContext->Irp);
- if (!Buffer)
- {
- Status = STATUS_INVALID_USER_BUFFER;
- goto ByeBye;
- }
-
- if (!(IrpContext->Irp->Flags & (IRP_NOCACHE|IRP_PAGING_IO)) &&
- !(Fcb->Flags & (FCB_IS_PAGE_FILE|FCB_IS_VOLUME)))
- {
- // cached read
- Status = STATUS_SUCCESS;
- if (ByteOffset.u.LowPart + Length > Fcb->RFCB.FileSize.u.LowPart)
- {
- Length = Fcb->RFCB.FileSize.u.LowPart - ByteOffset.u.LowPart;
- Status = /*STATUS_END_OF_FILE*/STATUS_SUCCESS;
- }
-
- if (IrpContext->FileObject->PrivateCacheMap == NULL)
- {
- CcInitializeCacheMap(IrpContext->FileObject,
- (PCC_FILE_SIZES)(&Fcb->RFCB.AllocationSize),
- FALSE,
- &(VfatGlobalData->CacheMgrCallbacks),
- Fcb);
- }
- if (!CcCopyRead(IrpContext->FileObject, &ByteOffset, Length,
- (BOOLEAN)(IrpContext->Flags & IRPCONTEXT_CANWAIT), Buffer,
- &IrpContext->Irp->IoStatus))
- {
- Status = STATUS_PENDING;
- goto ByeBye;
- }
- if (!NT_SUCCESS(IrpContext->Irp->IoStatus.Status))
- {
- Status = IrpContext->Irp->IoStatus.Status;
- }
- }
- else
- {
- // non cached read
- if (ByteOffset.QuadPart + Length > ROUND_UP(Fcb->RFCB.FileSize.QuadPart, BytesPerSector))
- {
- Length = (ULONG)(ROUND_UP(Fcb->RFCB.FileSize.QuadPart, BytesPerSector) - ByteOffset.QuadPart);
- }
-
- Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoWriteAccess);
- if (!NT_SUCCESS(Status))
+ if (DeviceObject != FatGlobalData.DiskDeviceObject)
+ {
+ /* Set Top Level IRP if not set */
+ if (IoGetTopLevelIrp() == NULL)
{
- goto ByeBye;
+ IoSetTopLevelIrp(Irp);
+ TopLevel = TRUE;
}
- Status = VfatReadFileData(IrpContext, Length, ByteOffset, &ReturnedLength);
-/**/
- if (Status == STATUS_VERIFY_REQUIRED)
- {
- DPRINT("VfatReadFile returned STATUS_VERIFY_REQUIRED\n");
- DeviceToVerify = IoGetDeviceToVerify(PsGetCurrentThread());
- IoSetDeviceToVerify(PsGetCurrentThread(), DeviceToVerify);
- Status = IoVerifyVolume (DeviceToVerify, FALSE);
-
- if (NT_SUCCESS(Status))
- {
- Status = VfatReadFileData(IrpContext, Length,
- ByteOffset, &ReturnedLength);
- }
+ /* Build an irp context */
+ IrpContext = FatBuildIrpContext(Irp, CanWait);
- }
-/**/
- if (NT_SUCCESS(Status))
- {
- IrpContext->Irp->IoStatus.Information = ReturnedLength;
- }
- }
+ /* Perform the actual read */
+ Status = FatiRead(IrpContext);
-ByeBye:
- if (Resource)
- {
- ExReleaseResourceLite(Resource);
- }
-
- if (Status == STATUS_PENDING)
- {
- Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoWriteAccess);
- if (NT_SUCCESS(Status))
- {
- Status = VfatQueueRequest(IrpContext);
- }
- else
- {
- IrpContext->Irp->IoStatus.Status = Status;
- IoCompleteRequest(IrpContext->Irp, IO_NO_INCREMENT);
- VfatFreeIrpContext(IrpContext);
- }
- }
- else
- {
- IrpContext->Irp->IoStatus.Status = Status;
- if (IrpContext->FileObject->Flags & FO_SYNCHRONOUS_IO &&
- !(IrpContext->Irp->Flags & IRP_PAGING_IO) &&
- (NT_SUCCESS(Status) || Status==STATUS_END_OF_FILE))
- {
- IrpContext->FileObject->CurrentByteOffset.QuadPart =
- ByteOffset.QuadPart + IrpContext->Irp->IoStatus.Information;
- }
+ /* Restore top level Irp */
+ if (TopLevel)
+ IoSetTopLevelIrp(NULL);
+ }
+ /* Leave FsRtl critical region */
+ FsRtlExitFileSystem();
- IoCompleteRequest(IrpContext->Irp,
- (CCHAR)(NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT));
- VfatFreeIrpContext(IrpContext);
- }
- DPRINT("%x\n", Status);
- return Status;
+ DPRINT1("FatRead()\n");
+ return Status;
}
-NTSTATUS VfatWrite (PVFAT_IRP_CONTEXT IrpContext)
+NTSTATUS
+NTAPI
+FatWrite(PDEVICE_OBJECT DeviceObject, PIRP Irp)
{
- PVFATFCB Fcb;
- PERESOURCE Resource = NULL;
- LARGE_INTEGER ByteOffset;
- LARGE_INTEGER OldFileSize;
- NTSTATUS Status = STATUS_SUCCESS;
- ULONG Length = 0;
- ULONG OldAllocationSize;
- PVOID Buffer;
- ULONG BytesPerSector;
-
- ASSERT(IrpContext);
-
- DPRINT("VfatWrite(IrpContext %p)\n", IrpContext);
-
- ASSERT(IrpContext->DeviceObject);
-
- // This request is not allowed on the main device object
- if (IrpContext->DeviceObject == VfatGlobalData->DeviceObject)
- {
- DPRINT("VfatWrite is called with the main device object.\n");
- Status = STATUS_INVALID_DEVICE_REQUEST;
- goto ByeBye;
- }
-
- ASSERT(IrpContext->DeviceExt);
- ASSERT(IrpContext->FileObject);
- Fcb = IrpContext->FileObject->FsContext;
- ASSERT(Fcb);
-
- DPRINT("<%wZ>\n", &Fcb->PathNameU);
-
- if (Fcb->Flags & FCB_IS_PAGE_FILE)
- {
- PFATINFO FatInfo = &IrpContext->DeviceExt->FatInfo;
- IrpContext->Stack->Parameters.Write.ByteOffset.QuadPart += FatInfo->dataStart * FatInfo->BytesPerSector;
- IoSkipCurrentIrpStackLocation(IrpContext->Irp);
- DPRINT("Write to page file, disk offset %I64x\n", IrpContext->Stack->Parameters.Write.ByteOffset.QuadPart);
- Status = IoCallDriver(IrpContext->DeviceExt->StorageDevice, IrpContext->Irp);
- VfatFreeIrpContext(IrpContext);
- return Status;
- }
-
- /* fail if file is a directory and no paged read */
- if (*Fcb->Attributes & FILE_ATTRIBUTE_DIRECTORY && !(IrpContext->Irp->Flags & IRP_PAGING_IO))
- {
- Status = STATUS_INVALID_PARAMETER;
- goto ByeBye;
- }
-
- ByteOffset = IrpContext->Stack->Parameters.Write.ByteOffset;
- if (ByteOffset.u.LowPart == FILE_WRITE_TO_END_OF_FILE &&
- ByteOffset.u.HighPart == -1)
- {
- ByteOffset.QuadPart = Fcb->RFCB.FileSize.QuadPart;
- }
- Length = IrpContext->Stack->Parameters.Write.Length;
- BytesPerSector = IrpContext->DeviceExt->FatInfo.BytesPerSector;
-
- if (ByteOffset.u.HighPart && !(Fcb->Flags & FCB_IS_VOLUME))
- {
- Status = STATUS_INVALID_PARAMETER;
- goto ByeBye;
- }
-
- if (Fcb->Flags & (FCB_IS_FAT | FCB_IS_VOLUME) ||
- 1 == vfatDirEntryGetFirstCluster (IrpContext->DeviceExt, &Fcb->entry))
- {
- if (ByteOffset.QuadPart + Length > Fcb->RFCB.FileSize.QuadPart)
- {
- // we can't extend the FAT, the volume or the root on FAT12/FAT16
- Status = STATUS_END_OF_FILE;
- goto ByeBye;
- }
- }
-
- if (IrpContext->Irp->Flags & (IRP_PAGING_IO|IRP_NOCACHE) || (Fcb->Flags & FCB_IS_VOLUME))
- {
- if (ByteOffset.u.LowPart % BytesPerSector != 0 || Length % BytesPerSector != 0)
- {
- // non cached write must be sector aligned
- Status = STATUS_INVALID_PARAMETER;
- goto ByeBye;
- }
- }
-
- if (Length == 0)
- {
- /* FIXME:
- * Update last write time
- */
- IrpContext->Irp->IoStatus.Information = 0;
- Status = STATUS_SUCCESS;
- goto ByeBye;
- }
-
- if (IrpContext->Irp->Flags & IRP_PAGING_IO)
- {
- if (ByteOffset.u.LowPart + Length > Fcb->RFCB.AllocationSize.u.LowPart)
- {
- Status = STATUS_INVALID_PARAMETER;
- goto ByeBye;
- }
- if (ByteOffset.u.LowPart + Length > ROUND_UP(Fcb->RFCB.AllocationSize.u.LowPart, BytesPerSector))
- {
- Length = ROUND_UP(Fcb->RFCB.FileSize.u.LowPart, BytesPerSector) - ByteOffset.u.LowPart;
- }
- }
-
- if (Fcb->Flags & FCB_IS_VOLUME)
- {
- Resource = &IrpContext->DeviceExt->DirResource;
- }
- else if (IrpContext->Irp->Flags & IRP_PAGING_IO)
- {
- Resource = &Fcb->PagingIoResource;
- }
- else
- {
- Resource = &Fcb->MainResource;
- }
-
- if (Fcb->Flags & FCB_IS_PAGE_FILE)
- {
- if (!ExAcquireResourceSharedLite(Resource,
- (BOOLEAN)(IrpContext->Flags & IRPCONTEXT_CANWAIT)))
- {
- Resource = NULL;
- Status = STATUS_PENDING;
- goto ByeBye;
- }
- }
- else
- {
- if (!ExAcquireResourceExclusiveLite(Resource,
- (BOOLEAN)(IrpContext->Flags & IRPCONTEXT_CANWAIT)))
- {
- Resource = NULL;
- Status = STATUS_PENDING;
- goto ByeBye;
- }
- }
-
- if (!(IrpContext->Irp->Flags & IRP_PAGING_IO) &&
- FsRtlAreThereCurrentFileLocks(&Fcb->FileLock))
- {
- if (!FsRtlCheckLockForWriteAccess(&Fcb->FileLock, IrpContext->Irp))
- {
- Status = STATUS_FILE_LOCK_CONFLICT;
- goto ByeBye;
- }
- }
-
- if (!(IrpContext->Flags & IRPCONTEXT_CANWAIT) && !(Fcb->Flags & FCB_IS_VOLUME))
- {
- if (ByteOffset.u.LowPart + Length > Fcb->RFCB.AllocationSize.u.LowPart)
- {
- Status = STATUS_PENDING;
- goto ByeBye;
- }
- }
-
- OldFileSize = Fcb->RFCB.FileSize;
- OldAllocationSize = Fcb->RFCB.AllocationSize.u.LowPart;
-
- Buffer = VfatGetUserBuffer(IrpContext->Irp);
- if (!Buffer)
- {
- Status = STATUS_INVALID_USER_BUFFER;
- goto ByeBye;
- }
-
-
- if (!(Fcb->Flags & (FCB_IS_FAT|FCB_IS_VOLUME)) &&
- !(IrpContext->Irp->Flags & IRP_PAGING_IO) &&
- ByteOffset.u.LowPart + Length > Fcb->RFCB.FileSize.u.LowPart)
- {
- LARGE_INTEGER AllocationSize;
- AllocationSize.QuadPart = ByteOffset.u.LowPart + Length;
- Status = VfatSetAllocationSizeInformation(IrpContext->FileObject, Fcb,
- IrpContext->DeviceExt, &AllocationSize);
- if (!NT_SUCCESS (Status))
- {
- goto ByeBye;
- }
- }
-
- if (!(IrpContext->Irp->Flags & (IRP_NOCACHE|IRP_PAGING_IO)) &&
- !(Fcb->Flags & (FCB_IS_PAGE_FILE|FCB_IS_VOLUME)))
- {
- // cached write
-
- if (IrpContext->FileObject->PrivateCacheMap == NULL)
- {
- CcInitializeCacheMap(IrpContext->FileObject,
- (PCC_FILE_SIZES)(&Fcb->RFCB.AllocationSize),
- FALSE,
- &VfatGlobalData->CacheMgrCallbacks,
- Fcb);
- }
- if (ByteOffset.QuadPart > OldFileSize.QuadPart)
- {
- CcZeroData(IrpContext->FileObject, &OldFileSize, &ByteOffset, TRUE);
- }
- if (CcCopyWrite(IrpContext->FileObject, &ByteOffset, Length,
- 1 /*IrpContext->Flags & IRPCONTEXT_CANWAIT*/, Buffer))
- {
- IrpContext->Irp->IoStatus.Information = Length;
- Status = STATUS_SUCCESS;
- }
- else
- {
- Status = STATUS_UNSUCCESSFUL;
- }
- }
- else
- {
- // non cached write
-
- if (ByteOffset.QuadPart > OldFileSize.QuadPart)
- {
- CcZeroData(IrpContext->FileObject, &OldFileSize, &ByteOffset, TRUE);
- }
-
- Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoReadAccess);
- if (!NT_SUCCESS(Status))
- {
- goto ByeBye;
- }
-
- Status = VfatWriteFileData(IrpContext, Length, ByteOffset);
- if (NT_SUCCESS(Status))
- {
- IrpContext->Irp->IoStatus.Information = Length;
- }
- }
-
- if (!(IrpContext->Irp->Flags & IRP_PAGING_IO) &&
- !(Fcb->Flags & (FCB_IS_FAT|FCB_IS_VOLUME)))
- {
- if(!(*Fcb->Attributes & FILE_ATTRIBUTE_DIRECTORY))
- {
- LARGE_INTEGER SystemTime;
- // set dates and times
- KeQuerySystemTime (&SystemTime);
- if (Fcb->Flags & FCB_IS_FATX_ENTRY)
- {
- FsdSystemTimeToDosDateTime (IrpContext->DeviceExt,
- &SystemTime, &Fcb->entry.FatX.UpdateDate,
- &Fcb->entry.FatX.UpdateTime);
- Fcb->entry.FatX.AccessDate = Fcb->entry.FatX.UpdateDate;
- Fcb->entry.FatX.AccessTime = Fcb->entry.FatX.UpdateTime;
- }
- else
- {
- FsdSystemTimeToDosDateTime (IrpContext->DeviceExt,
- &SystemTime, &Fcb->entry.Fat.UpdateDate,
- &Fcb->entry.Fat.UpdateTime);
- Fcb->entry.Fat.AccessDate = Fcb->entry.Fat.UpdateDate;
- }
- /* set date and times to dirty */
- Fcb->Flags |= FCB_IS_DIRTY;
- }
- }
-
-ByeBye:
- if (Resource)
- {
- ExReleaseResourceLite(Resource);
- }
-
- if (Status == STATUS_PENDING)
- {
- Status = VfatLockUserBuffer(IrpContext->Irp, Length, IoReadAccess);
- if (NT_SUCCESS(Status))
- {
- Status = VfatQueueRequest(IrpContext);
- }
- else
- {
- IrpContext->Irp->IoStatus.Status = Status;
- IoCompleteRequest(IrpContext->Irp, IO_NO_INCREMENT);
- VfatFreeIrpContext(IrpContext);
- }
- }
- else
- {
- IrpContext->Irp->IoStatus.Status = Status;
- if (IrpContext->FileObject->Flags & FO_SYNCHRONOUS_IO &&
- !(IrpContext->Irp->Flags & IRP_PAGING_IO) && NT_SUCCESS(Status))
- {
- IrpContext->FileObject->CurrentByteOffset.QuadPart =
- ByteOffset.QuadPart + IrpContext->Irp->IoStatus.Information;
- }
-
- IoCompleteRequest(IrpContext->Irp,
- (CCHAR)(NT_SUCCESS(Status) ? IO_DISK_INCREMENT : IO_NO_INCREMENT));
- VfatFreeIrpContext(IrpContext);
- }
- DPRINT("%x\n", Status);
- return Status;
+ DPRINT1("FatWrite()\n");
+ return STATUS_NOT_IMPLEMENTED;
}
projects / reactos.git / blobdiff