/*
* ReactOS kernel
- * Copyright (C) 2002 ReactOS Team
+ * Copyright (C) 2002, 2014 ReactOS Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* COPYRIGHT: See COPYING in the top level directory
* PROJECT: ReactOS kernel
* FILE: drivers/filesystem/ntfs/rw.c
- * PURPOSE: CDROM (ISO 9660) filesystem driver
- * PROGRAMMER: Art Yerkes
- * UPDATE HISTORY:
+ * PURPOSE: NTFS filesystem driver
+ * PROGRAMMERS: Art Yerkes
+ * Pierre Schweitzer (pierre@reactos.org)
*/
/* INCLUDES *****************************************************************/
#include <ntddk.h>
+#include "ntfs.h"
#define NDEBUG
#include <debug.h>
-#include "ntfs.h"
-
-
-/* GLOBALS *******************************************************************/
-
-#define ROUND_UP(N, S) ((((N) + (S) - 1) / (S)) * (S))
-#define ROUND_DOWN(N, S) ((N) - ((N) % (S)))
-
-
/* FUNCTIONS ****************************************************************/
-static NTSTATUS
-NtfsReadFile(PDEVICE_EXTENSION DeviceExt,
- PFILE_OBJECT FileObject,
- PUCHAR Buffer,
- ULONG Length,
- ULONG ReadOffset,
- ULONG IrpFlags,
- PULONG LengthRead)
/*
* FUNCTION: Reads data from a file
*/
+static
+NTSTATUS
+NtfsReadFile(PDEVICE_EXTENSION DeviceExt,
+ PFILE_OBJECT FileObject,
+ PUCHAR Buffer,
+ ULONG Length,
+ ULONG ReadOffset,
+ ULONG IrpFlags,
+ PULONG LengthRead)
{
-#if 0
- NTSTATUS Status = STATUS_SUCCESS;
- PUCHAR TempBuffer;
- ULONG TempLength;
- PCCB Ccb;
- PFCB Fcb;
+ NTSTATUS Status = STATUS_SUCCESS;
+ PNTFS_FCB Fcb;
+ PFILE_RECORD_HEADER FileRecord;
+ PNTFS_ATTR_CONTEXT DataContext;
+ ULONG RealLength;
+ ULONG RealReadOffset;
+ ULONG RealLengthRead;
+ ULONG ToRead;
+ BOOLEAN AllocatedBuffer = FALSE;
+ PCHAR ReadBuffer = (PCHAR)Buffer;
+ ULONGLONG StreamSize;
+
+ DPRINT1("NtfsReadFile(%p, %p, %p, %u, %u, %x, %p)\n", DeviceExt, FileObject, Buffer, Length, ReadOffset, IrpFlags, LengthRead);
+
+ *LengthRead = 0;
+
+ if (Length == 0)
+ {
+ DPRINT1("Null read!\n");
+ return STATUS_SUCCESS;
+ }
+
+ Fcb = (PNTFS_FCB)FileObject->FsContext;
+
+ if (NtfsFCBIsCompressed(Fcb))
+ {
+ DPRINT1("Compressed file!\n");
+ UNIMPLEMENTED;
+ return STATUS_NOT_IMPLEMENTED;
+ }
+
+ FileRecord = ExAllocatePoolWithTag(NonPagedPool, DeviceExt->NtfsInfo.BytesPerFileRecord, TAG_NTFS);
+ if (FileRecord == NULL)
+ {
+ DPRINT1("Not enough memory!\n");
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
- DPRINT("CdfsReadFile(ReadOffset %lu Length %lu)\n", ReadOffset, Length);
+ Status = ReadFileRecord(DeviceExt, Fcb->MFTIndex, FileRecord);
+ if (!NT_SUCCESS(Status))
+ {
+ DPRINT1("Can't find record!\n");
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return Status;
+ }
+
+
+ Status = FindAttribute(DeviceExt, FileRecord, AttributeData, Fcb->Stream, wcslen(Fcb->Stream), &DataContext);
+ if (!NT_SUCCESS(Status))
+ {
+ NTSTATUS BrowseStatus;
+ FIND_ATTR_CONTXT Context;
+ PNTFS_ATTR_RECORD Attribute;
+
+ DPRINT1("No '%S' data stream associated with file!\n", Fcb->Stream);
+
+ BrowseStatus = FindFirstAttribute(&Context, DeviceExt, FileRecord, FALSE, &Attribute);
+ while (NT_SUCCESS(BrowseStatus))
+ {
+ if (Attribute->Type == AttributeData)
+ {
+ UNICODE_STRING Name;
+
+ Name.Length = Attribute->NameLength * sizeof(WCHAR);
+ Name.MaximumLength = Name.Length;
+ Name.Buffer = (PWCHAR)((ULONG_PTR)Attribute + Attribute->NameOffset);
+ DPRINT1("Data stream: '%wZ' available\n", &Name);
+ }
+
+ BrowseStatus = FindNextAttribute(&Context, &Attribute);
+ }
+ FindCloseAttribute(&Context);
+
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return Status;
+ }
+
+ StreamSize = AttributeDataLength(&DataContext->Record);
+ if (ReadOffset >= StreamSize)
+ {
+ DPRINT1("Reading beyond stream end!\n");
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return STATUS_END_OF_FILE;
+ }
- *LengthRead = 0;
+ ToRead = Length;
+ if (ReadOffset + Length > StreamSize)
+ ToRead = StreamSize - ReadOffset;
- if (Length == 0)
- return(STATUS_SUCCESS);
+ RealReadOffset = ReadOffset;
+ RealLength = ToRead;
- Ccb = (PCCB)FileObject->FsContext2;
- Fcb = (PFCB)FileObject->FsContext;
+ if ((ReadOffset % DeviceExt->NtfsInfo.BytesPerSector) != 0 || (ToRead % DeviceExt->NtfsInfo.BytesPerSector) != 0)
+ {
+ RealReadOffset = ROUND_DOWN(ReadOffset, DeviceExt->NtfsInfo.BytesPerSector);
+ RealLength = ROUND_UP(ToRead, DeviceExt->NtfsInfo.BytesPerSector);
+ /* do we need to extend RealLength by one sector? */
+ if (RealLength + RealReadOffset < ReadOffset + Length)
+ {
+ if (RealReadOffset + RealLength + DeviceExt->NtfsInfo.BytesPerSector <= AttributeAllocatedLength(&DataContext->Record))
+ RealLength += DeviceExt->NtfsInfo.BytesPerSector;
+ }
+
+
+ ReadBuffer = ExAllocatePoolWithTag(NonPagedPool, RealLength, TAG_NTFS);
+ if (ReadBuffer == NULL)
+ {
+ DPRINT1("Not enough memory!\n");
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ return STATUS_INSUFFICIENT_RESOURCES;
+ }
+ AllocatedBuffer = TRUE;
+ }
+
+ DPRINT1("Effective read: %lu at %lu for stream '%S'\n", RealLength, RealReadOffset, Fcb->Stream);
+ RealLengthRead = ReadAttribute(DeviceExt, DataContext, RealReadOffset, (PCHAR)ReadBuffer, RealLength);
+ if (RealLengthRead == 0)
+ {
+ DPRINT1("Read failure!\n");
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
+ if (AllocatedBuffer)
+ {
+ ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
+ }
+ return Status;
+ }
- if (ReadOffset >= Fcb->Entry.DataLengthL)
- return(STATUS_END_OF_FILE);
+ ReleaseAttributeContext(DataContext);
+ ExFreePoolWithTag(FileRecord, TAG_NTFS);
- DPRINT("Reading %d bytes at %d\n", Length, ReadOffset);
+ *LengthRead = ToRead;
- if (!(IrpFlags & (IRP_NOCACHE|IRP_PAGING_IO)))
+ DPRINT1("%lu got read\n", *LengthRead);
+
+ if (AllocatedBuffer)
{
- LARGE_INTEGER FileOffset;
- IO_STATUS_BLOCK IoStatus;
-
- if (ReadOffset + Length > Fcb->Entry.DataLengthL)
- Length = Fcb->Entry.DataLengthL - ReadOffset;
- if (FileObject->PrivateCacheMap == NULL)
- {
- CcRosInitializeFileCache(FileObject, PAGE_SIZE);
- }
-
- FileOffset.QuadPart = (LONGLONG)ReadOffset;
- CcCopyRead(FileObject,
- &FileOffset,
- Length,
- TRUE,
- Buffer,
- &IoStatus);
- *LengthRead = IoStatus.Information;
-
- return(IoStatus.Status);
+ RtlCopyMemory(Buffer, ReadBuffer + (ReadOffset - RealReadOffset), ToRead);
}
- if ((ReadOffset % BLOCKSIZE) != 0 || (Length % BLOCKSIZE) != 0)
+ if (ToRead != Length)
{
- return STATUS_INVALID_PARAMETER;
+ RtlZeroMemory(Buffer + ToRead, Length - ToRead);
}
- if (ReadOffset + Length > ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE))
- Length = ROUND_UP(Fcb->Entry.DataLengthL, BLOCKSIZE) - ReadOffset;
-
- Status = CdfsReadSectors(DeviceExt->StorageDevice,
- Fcb->Entry.ExtentLocationL + (ReadOffset / BLOCKSIZE),
- Length / BLOCKSIZE,
- Buffer);
- if (NT_SUCCESS(Status))
+
+ if (AllocatedBuffer)
{
- *LengthRead = Length;
- if (Length + ReadOffset > Fcb->Entry.DataLengthL)
- {
- memset(Buffer + Fcb->Entry.DataLengthL - ReadOffset,
- 0, Length + ReadOffset - Fcb->Entry.DataLengthL);
- }
+ ExFreePoolWithTag(ReadBuffer, TAG_NTFS);
}
- return(Status);
-#else
- *LengthRead = 0;
- return STATUS_END_OF_FILE;
-#endif
+ return STATUS_SUCCESS;
}
-NTSTATUS NTAPI
-NtfsFsdRead(PDEVICE_OBJECT DeviceObject,
- PIRP Irp)
+NTSTATUS
+NtfsRead(PNTFS_IRP_CONTEXT IrpContext)
{
- PDEVICE_EXTENSION DeviceExt;
- PIO_STACK_LOCATION Stack;
- PFILE_OBJECT FileObject;
- PVOID Buffer;
- ULONG ReadLength;
- LARGE_INTEGER ReadOffset;
- ULONG ReturnedReadLength = 0;
- NTSTATUS Status = STATUS_SUCCESS;
-
- DPRINT("NtfsRead(DeviceObject %x, Irp %x)\n",DeviceObject,Irp);
-
- DeviceExt = DeviceObject->DeviceExtension;
- Stack = IoGetCurrentIrpStackLocation(Irp);
- FileObject = Stack->FileObject;
-
- ReadLength = Stack->Parameters.Read.Length;
- ReadOffset = Stack->Parameters.Read.ByteOffset;
- Buffer = MmGetSystemAddressForMdl(Irp->MdlAddress);
-
- Status = NtfsReadFile(DeviceExt,
- FileObject,
- Buffer,
- ReadLength,
- ReadOffset.u.LowPart,
- Irp->Flags,
- &ReturnedReadLength);
-
- if (NT_SUCCESS(Status))
+ PDEVICE_EXTENSION DeviceExt;
+ PIO_STACK_LOCATION Stack;
+ PFILE_OBJECT FileObject;
+ PVOID Buffer;
+ ULONG ReadLength;
+ LARGE_INTEGER ReadOffset;
+ ULONG ReturnedReadLength = 0;
+ NTSTATUS Status = STATUS_SUCCESS;
+ PIRP Irp;
+ PDEVICE_OBJECT DeviceObject;
+
+ DPRINT("NtfsRead(IrpContext %p)\n", IrpContext);
+
+ DeviceObject = IrpContext->DeviceObject;
+ Irp = IrpContext->Irp;
+ Stack = IrpContext->Stack;
+ FileObject = IrpContext->FileObject;
+
+ DeviceExt = DeviceObject->DeviceExtension;
+ ReadLength = Stack->Parameters.Read.Length;
+ ReadOffset = Stack->Parameters.Read.ByteOffset;
+ Buffer = NtfsGetUserBuffer(Irp, BooleanFlagOn(Irp->Flags, IRP_PAGING_IO));
+
+ Status = NtfsReadFile(DeviceExt,
+ FileObject,
+ Buffer,
+ ReadLength,
+ ReadOffset.u.LowPart,
+ Irp->Flags,
+ &ReturnedReadLength);
+ if (NT_SUCCESS(Status))
{
- if (FileObject->Flags & FO_SYNCHRONOUS_IO)
- {
- FileObject->CurrentByteOffset.QuadPart =
- ReadOffset.QuadPart + ReturnedReadLength;
- }
- Irp->IoStatus.Information = ReturnedReadLength;
+ if (FileObject->Flags & FO_SYNCHRONOUS_IO)
+ {
+ FileObject->CurrentByteOffset.QuadPart =
+ ReadOffset.QuadPart + ReturnedReadLength;
+ }
+
+ Irp->IoStatus.Information = ReturnedReadLength;
}
- else
+ else
{
- Irp->IoStatus.Information = 0;
+ Irp->IoStatus.Information = 0;
}
- Irp->IoStatus.Status = Status;
- IoCompleteRequest(Irp,IO_NO_INCREMENT);
-
- return(Status);
+ return Status;
}
-NTSTATUS NTAPI
-NtfsFsdWrite(PDEVICE_OBJECT DeviceObject,
- PIRP Irp)
+NTSTATUS
+NtfsWrite(PNTFS_IRP_CONTEXT IrpContext)
{
- DPRINT("NtfwWrite(DeviceObject %x Irp %x)\n",DeviceObject,Irp);
+ DPRINT("NtfsWrite(IrpContext %p)\n",IrpContext);
- Irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
- Irp->IoStatus.Information = 0;
- return(STATUS_NOT_SUPPORTED);
+ IrpContext->Irp->IoStatus.Information = 0;
+ return STATUS_NOT_SUPPORTED;
}
/* EOF */
projects / reactos.git / blobdiff