[Bug 29706] New: GetDiskFreeSpaceEx() returns negative sizes for large drives

http://bugs.winehq.org/show_bug.cgi?id=29706

Bug #: 29706
           Summary: GetDiskFreeSpaceEx() returns negative sizes for large
                    drives
           Product: Wine
           Version: unspecified
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: ntdll
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]
    Classification: Unclassified

When faced with a partition that has more than 1TB of free disk space it looks
like this API returns a negative value. Apparently this happened on OpenSUSE
11.4 64bit with a 32bit Wine; but not being fortunate enough to have this much
free disk space I cannot verify this.

I suspect some Unix API we call returns the free disk size in block of 512
bytes, thus overflowing at 2^31-1 blocks which is about 1TB. Then
GetDiskFreeSpaceEx() takes that and returns a negative free disk space.

Note that GetDiskFreeSpaceEx() returns 64bit values so there's no obstable to
it handle such large disks in theory.