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[Qemu-devel] [PATCH] qga-win: don't hang if vss hold writes timeout
From: |
Chen Hanxiao |
Subject: |
[Qemu-devel] [PATCH] qga-win: don't hang if vss hold writes timeout |
Date: |
Fri, 22 Sep 2017 10:46:06 +0800 |
From: Chen Hanxiao <address@hidden>
When VM is in a heavy IO, if the command "guest-fsfreeze-freeze"
is executed, VSS may timeout when trying to hold writes.
Inside guest, Event ID 12298(VSS_ERROR_HOLD_WRITES_TIMEOUT)
is logged in the Event Viewer.
At that time, if we call AbortBackup, qga may hang forever.
This patch will solve this issues.
Signed-off-by: Chen Hanxiao <address@hidden>
---
qga/vss-win32/requester.cpp | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/qga/vss-win32/requester.cpp b/qga/vss-win32/requester.cpp
index 301762d..3d9c971 100644
--- a/qga/vss-win32/requester.cpp
+++ b/qga/vss-win32/requester.cpp
@@ -419,6 +419,16 @@ void requester_freeze(int *num_vols, ErrorSet *errset)
break;
}
}
+
+ if (wait_status == WAIT_TIMEOUT) {
+ err_set(errset, E_FAIL,
+ "timeout when try to receive Frozen event from VSS provider");
+ /* If we are here, VSS had timeout.
+ * Don't call AbortBackup, just return directly.
+ */
+ goto out1;
+ }
+
if (wait_status != WAIT_OBJECT_0) {
err_set(errset, E_FAIL,
"couldn't receive Frozen event from VSS provider");
@@ -432,6 +442,8 @@ out:
if (vss_ctx.pVssbc) {
vss_ctx.pVssbc->AbortBackup();
}
+
+out1:
requester_cleanup();
CoUninitialize();
}
--
2.7.5
- [Qemu-devel] [PATCH] qga-win: don't hang if vss hold writes timeout,
Chen Hanxiao <=