[Bug 30592] New: Give kernel32.GetDiskFreeSpaceExW a trace message to better diagnose free disk space overflow problems with Win9X era apps/games

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=30592

             Bug #: 30592
           Summary: Give kernel32.GetDiskFreeSpaceExW a trace message to
                    better diagnose free disk space overflow problems with
                    Win9X era apps/games
           Product: Wine
           Version: 1.5.3
          Platform: x86
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: P2
         Component: kernel32
        AssignedTo: wine-bugs at winehq.org
        ReportedBy: focht at gmx.net
    Classification: Unclassified


Hello,

another enhancement request for better diagnosis ...

Sometimes I encounter broken Win9X era apps/games that suffer from
GetDiskFreeSpaceA/W overflows.

Example code which contains overflows:

--- snip ---
0x00428414: pushl    %ecx
0x00428415: pushl    %eax
0x00428416: leal    0x1c(%esp),%ecx
0x0042841a: pushl    %edx
0x0042841b: leal    0x10(%esp),%eax
0x0042841f: pushl    %ecx
0x00428420: pushl    %eax
0x00428421: call    *0x8a75fc -> 0x7b88273a GetDiskFreeSpaceA
0x00428427: movl    0xc(%esp),%ecx   ; ecx = free_clusters
0x0042842b: movl    0x320(%esp),%eax ; needed space (compare value)
0x00428432: imull    0x10(%esp),%ecx  ; ecx *= sector_bytes
0x00428437: imull    0x14(%esp),%ecx  ; ecx *= cluster_sectors
0x0042843c: cmpl    %ecx,%eax
0x0042843e: jnle    0x0042844c
0x00428440: xorl    %eax,%eax
0x00428442: popl    %ebx
0x00428443: addl    $0x318,%esp
0x00428449: ret    $0x4
0x0042844c: subl    %ecx,%eax
0x0042844e: popl    %ebx
--- snip ---

If you currently do +volume trace:

--- snip ---
0024:Call KERNEL32.GetDiskFreeSpaceA(0032eccc
"C:\\",0032ecdc,0032ecd8,0032ecd4,0032ece0) ret=00428427
0024:trace:volume:GetDiskFreeSpaceW L"C:\\",0x32ecdc,0x32ecd8,0x32ecd4,0x32ece0
0024:Ret  KERNEL32.GetDiskFreeSpaceA() retval=00000001 ret=00428427 
...
0024:trace:msvcrt:pf_printf_a Format is: "You do not have enough disk space to
run King's Quest: Mask of Eternity. Please free up %d megs of space and try
again." 
--- snip ---

I'd like to see all the information returned to caller when doing +volume
trace.

Source:
http://source.winehq.org/git/wine.git/blob/1726427113b141535c2bb9e93879e409b7d00c37:/dlls/kernel32/volume.c#l1598

--- snip ---
1598 BOOL WINAPI GetDiskFreeSpaceExW( LPCWSTR root, PULARGE_INTEGER avail,
1599                                  PULARGE_INTEGER total, PULARGE_INTEGER
totalfree )
1600 {
1601     FILE_FS_SIZE_INFORMATION info;
1602     IO_STATUS_BLOCK io;
1603     NTSTATUS status;
1604     HANDLE handle;
1605     UINT units;
1606 
1607     TRACE( "%s,%p,%p,%p\n", debugstr_w(root), avail, total, totalfree );
1608 
1609     if (!open_device_root( root, &handle )) return FALSE;
1610 
1611     status = NtQueryVolumeInformationFile( handle, &io, &info,
sizeof(info), FileFsSizeInformation );
1612     NtClose( handle );
1613     if (status != STATUS_SUCCESS)
1614     {
1615         SetLastError( RtlNtStatusToDosError(status) );
1616         return FALSE;
1617     }
1618 
1619     units = info.SectorsPerAllocationUnit * info.BytesPerSector;
1620     if (total) total->QuadPart = info.TotalAllocationUnits.QuadPart *
units;
1621     if (totalfree) totalfree->QuadPart =
info.AvailableAllocationUnits.QuadPart * units;
1622     /* FIXME: this one should take quotas into account */
1623     if (avail) avail->QuadPart = info.AvailableAllocationUnits.QuadPart *
units;
1624     return TRUE;
1625 }
--- snip ---

Before the return on line 1624 a TRACE() would be very helpful, printing the
actual values of out parameters: cluster_sector, sector_bytes, free_clusters,
total_clusters
Additionally a hint if the values were capped due to Win9X compat (capped=0/1).

Actual 32-bits overflow warning would be a bonus but not required ;-)

Thanks.

Regards

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