[Qemu-devel] [PATCH] qga-win: Handle fstrim for OSes lower than Win8

[Sameeh Jubran <sameeh@daynix.com>]

From: Sameeh Jubran <sjubran@redhat.com>

The defrag.exe tool which is used for executing the fstrim command
on Windows doesn't support retrim for OSes lower than Win8. This
commit handles this case and returns a suitable error.

Output of fstrim before this commit:
{"execute":"guest-fstrim"}
{"return": {"paths": [{"path": "C:\\", "error": "An invalid command line option
was specified. (0x89000008)"}, {"path": "F:\\", "error": "An invalid command
line option was specified. (0x89000008)"}, {"path": "S:\\", "error": "An
invalid command line option was specified. (0x89000008)"}]}}

Reported on:
https://bugzilla.redhat.com/show_bug.cgi?id=1594113

Signed-off-by: Sameeh Jubran <sjubran@redhat.com>
---
 qga/commands-win32.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index d79974f212..0bdcd9dd38 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -30,6 +30,7 @@
 #include <lm.h>
 #include <wtsapi32.h>
 #include <wininet.h>
+#include <versionhelpers.h>
 
 #include "qga/guest-agent-core.h"
 #include "qga/vss-win32.h"
@@ -852,6 +853,11 @@ qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
     HANDLE handle;
     WCHAR guid[MAX_PATH] = L"";
 
+   if (!IsWindows8OrGreater()) {
+        error_setg(errp, "fstrim is only supported for Win8+");
+        return NULL;
+   }
+
     handle = FindFirstVolumeW(guid, ARRAYSIZE(guid));
     if (handle == INVALID_HANDLE_VALUE) {
         error_setg_win32(errp, GetLastError(), "failed to find any volume");
-- 
2.13.6