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sys: IRP_MJ_READ, IRP_MJ_WRITE: fix paging I/O sizes

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This commit is contained in:
Bill Zissimopoulos
2016-04-13 18:00:02 -07:00
parent 49f9f13806
commit 41296044e6
6 changed files with 34 additions and 27 deletions
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24
tst/memfs/memfs.cpp
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@ -482,17 +482,29 @@ static NTSTATUS Read(FSP_FILE_SYSTEM *FileSystem,
static NTSTATUS Write(FSP_FILE_SYSTEM *FileSystem,
FSP_FSCTL_TRANSACT_REQ *Request,
PVOID FileNode0, PVOID Buffer, UINT64 Offset, ULONG Length, BOOLEAN WriteToEndOfFile,
PVOID FileNode0, PVOID Buffer, UINT64 Offset, ULONG Length,
BOOLEAN WriteToEndOfFile, BOOLEAN ConstrainedIo,
PULONG PBytesTransferred, FSP_FSCTL_FILE_INFO *FileInfo)
{
MEMFS_FILE_NODE *FileNode = (MEMFS_FILE_NODE *)FileNode0;
UINT64 EndOffset;
if (WriteToEndOfFile)
Offset = FileNode->FileInfo.FileSize;
EndOffset = Offset + Length;
if (EndOffset > FileNode->FileInfo.FileSize)
SetFileSize(FileSystem, Request, FileNode, EndOffset, FileInfo);
if (ConstrainedIo)
{
if (Offset >= FileNode->FileInfo.FileSize)
return STATUS_SUCCESS;
EndOffset = Offset + Length;
if (EndOffset > FileNode->FileInfo.FileSize)
EndOffset = FileNode->FileInfo.FileSize;
}
else
{
if (WriteToEndOfFile)
Offset = FileNode->FileInfo.FileSize;
EndOffset = Offset + Length;
if (EndOffset > FileNode->FileInfo.FileSize)
SetFileSize(FileSystem, Request, FileNode, EndOffset, FileInfo);
}
memcpy((PUINT8)FileNode->FileData + Offset, Buffer, EndOffset - Offset);