mirror of
https://github.com/reactos/reactos.git
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6c0c23cb53
- Sync with trunk head (r50270) - This also reverts r49298. svn path=/branches/cmake-bringup/; revision=50271
121 lines
3.1 KiB
C
121 lines
3.1 KiB
C
/*
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* PROJECT: ReactOS FAT file system driver
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* LICENSE: GNU GPLv3 as published by the Free Software Foundation
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* FILE: drivers/filesystems/fastfat/rw.c
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* PURPOSE: Read/write support
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* PROGRAMMERS: Aleksey Bragin (aleksey@reactos.org)
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*/
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/* INCLUDES *****************************************************************/
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#define NDEBUG
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#include "fastfat.h"
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/* FUNCTIONS *****************************************************************/
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NTSTATUS
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NTAPI
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FatiRead(PFAT_IRP_CONTEXT IrpContext)
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{
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ULONG NumberOfBytes;
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LARGE_INTEGER ByteOffset;
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PFILE_OBJECT FileObject;
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TYPE_OF_OPEN OpenType;
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PIO_STACK_LOCATION IrpSp = IrpContext->Stack;
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PFCB Fcb;
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PVCB Vcb;
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PCCB Ccb;
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PVOID Buffer;
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LONG BytesRead;
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FileObject = IrpSp->FileObject;
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NumberOfBytes = IrpSp->Parameters.Read.Length;
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ByteOffset = IrpSp->Parameters.Read.ByteOffset;
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if (NumberOfBytes == 0)
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{
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FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
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return STATUS_SUCCESS;
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}
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OpenType = FatDecodeFileObject(FileObject, &Vcb, &Fcb, &Ccb);
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DPRINT("FatiRead() Fcb %p, Name %wZ, Offset %d, Length %d, Handle %p\n",
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Fcb, &FileObject->FileName, ByteOffset.LowPart, NumberOfBytes, Fcb->FatHandle);
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/* Perform actual read */
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if (IrpContext->MinorFunction & IRP_MN_MDL)
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{
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DPRINT1("MDL read\n");
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}
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else
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{
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Buffer = FatMapUserBuffer(IrpContext->Irp);
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DPRINT("Normal cached read, buffer %p\n");
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/* Set offset */
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FF_Seek(Fcb->FatHandle, ByteOffset.LowPart, FF_SEEK_SET);
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/* Read */
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BytesRead = FF_Read(Fcb->FatHandle, NumberOfBytes, 1, Buffer);
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DPRINT("Read %d bytes\n", BytesRead);
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/* Indicate we read requested amount of bytes */
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IrpContext->Irp->IoStatus.Information = BytesRead;
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IrpContext->Irp->IoStatus.Status = STATUS_SUCCESS;
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}
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/* Complete the request */
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FatCompleteRequest(IrpContext, IrpContext->Irp, STATUS_SUCCESS);
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return STATUS_SUCCESS;
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}
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NTSTATUS
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NTAPI
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FatRead(PDEVICE_OBJECT DeviceObject, PIRP Irp)
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{
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NTSTATUS Status;
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BOOLEAN TopLevel, CanWait;
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PFAT_IRP_CONTEXT IrpContext;
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CanWait = TRUE;
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TopLevel = FALSE;
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Status = STATUS_INVALID_DEVICE_REQUEST;
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/* Get CanWait flag */
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if (IoGetCurrentIrpStackLocation(Irp)->FileObject != NULL)
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CanWait = IoIsOperationSynchronous(Irp);
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/* Enter FsRtl critical region */
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FsRtlEnterFileSystem();
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if (DeviceObject != FatGlobalData.DiskDeviceObject)
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{
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/* Set Top Level IRP if not set */
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TopLevel = FatIsTopLevelIrp(Irp);
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/* Build an irp context */
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IrpContext = FatBuildIrpContext(Irp, CanWait);
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/* Perform the actual read */
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Status = FatiRead(IrpContext);
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/* Restore top level Irp */
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if (TopLevel)
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IoSetTopLevelIrp(NULL);
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}
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/* Leave FsRtl critical region */
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FsRtlExitFileSystem();
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return Status;
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}
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NTSTATUS
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NTAPI
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FatWrite(PDEVICE_OBJECT DeviceObject, PIRP Irp)
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{
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DPRINT1("FatWrite()\n");
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return STATUS_NOT_IMPLEMENTED;
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}
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