[Bug 26231] New: File IO memory consumption

http://bugs.winehq.org/show_bug.cgi?id=26231

Summary: File IO memory consumption
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: ntdll
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Tested on: Ubuntu ( Linux version 2.6.31-20-generic.   VMWare vm )
           CentOS ( Linux version 2.6.18-164.15.1.el5. VMWare vm )
           Gentoo ( Linux version 2.6.34-gentoo-r6.    VMWare vm, 
                                                       physical machine )
File Systems: ext2, ext3.
Reprodused: always.

Function: WriteFile(any params). Haven't tested ReadFile yet.

WriteFile causes FS buffer grows equal to amount of data written (after writing
threshold amount of data, kernel kills process with "out of memory" message).
Memory freed only after buffer become invalid (for example, echo > <filename>.
FS keeps memory even after wine process and wine server finished execution).

Simple program:

BYTE pBuffer[1024];
    DWORD dwWritten = 0;

memset(pBuffer, 0xCE, sizeof(pBuffer));

HANDLE hFile = CreateFile(_T("C:\test.img"),             
                              GENERIC_ALL, 
                              0, 
                              NULL, 
                              OPEN_EXISTING, 
                              FILE_ATTRIBUTE_NORMAL, 
                              NULL);

for (int i = 0; i < 256 * 1024; ++i)
    {
        WriteFile(hFile, pBuffer, sizeof(pBuffer), &dwWritten, NULL);
    }

CloseHandle(hFile);

Output: 256Mb memory leak.

Temporary I have added O_DIRECT option support to wine server and switched to
ext2 FS(works fine for me).