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qga-win: don't hang if vss hold writes timeout

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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 issue.

Cc: Michael Roth <mdroth@linux.vnet.ibm.com>
Cc: Tomoki Sekiyama <tomoki.sekiyama@gmail.com>

Signed-off-by: Chen Hanxiao <chenhanxiao@gmail.com>
Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
This commit is contained in:
Chen Hanxiao 2017-10-17 14:41:42 +08:00 committed by Michael Roth
parent ae49fbbcd8
commit 4d80d20fe1
1 changed files with 12 additions and 0 deletions
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12
qga/vss-win32/requester.cpp
View File

@ -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();
}