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Fix up the locking in the snapshot code.

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In particular I was forgetting to take the qemuMonitorPrivatePtr
lock (via qemuDomainObjBeginJob), which would cause problems
if two users tried to access the same domain at the same time.
This patch also fixes a problem where I was forgetting to remove
a transient domain from the list of domains.

Thanks to Stephen Shaw for pointing out the problem and testing
out the initial patch.

Signed-off-by: Chris Lalancette <clalance@redhat.com>
This commit is contained in:
Chris Lalancette 2010-04-22 12:01:56 -04:00
parent 0c4010a1d7
commit b69bbebbba
1 changed files with 31 additions and 14 deletions
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45
src/qemu/qemu_driver.c
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@ -10700,7 +10700,6 @@ static virDomainSnapshotPtr qemuDomainSnapshotCreateXML(virDomainPtr domain,
virDomainSnapshotPtr snapshot = NULL;
char uuidstr[VIR_UUID_STRING_BUFLEN];
virDomainSnapshotDefPtr def;
qemuDomainObjPrivatePtr priv;
const char *qemuimgarg[] = { NULL, "snapshot", "-c", NULL, NULL, NULL };
int i;
@ -10767,14 +10766,19 @@ static virDomainSnapshotPtr qemuDomainSnapshotCreateXML(virDomainPtr domain,
}
}
else {
qemuDomainObjPrivatePtr priv;
int ret;
if (qemuDomainObjBeginJobWithDriver(driver, vm) < 0)
goto cleanup;
priv = vm->privateData;
qemuDomainObjEnterMonitorWithDriver(driver, vm);
if (qemuMonitorCreateSnapshot(priv->mon, def->name) < 0) {
qemuDomainObjExitMonitorWithDriver(driver, vm);
goto cleanup;
}
ret = qemuMonitorCreateSnapshot(priv->mon, def->name);
qemuDomainObjExitMonitorWithDriver(driver, vm);
if (qemuDomainObjEndJob(vm) == 0)
vm = NULL;
if (ret < 0)
goto cleanup;
}
snap->def->state = vm->state;
@ -11047,18 +11051,18 @@ static int qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
rc = qemuMonitorLoadSnapshot(priv->mon, snap->def->name);
qemuDomainObjExitMonitorWithDriver(driver, vm);
if (rc < 0)
goto cleanup;
goto endjob;
}
else {
if (qemuDomainSnapshotSetActive(vm, driver->snapshotDir) < 0)
goto cleanup;
goto endjob;
rc = qemudStartVMDaemon(snapshot->domain->conn, driver, vm, NULL,
-1);
if (qemuDomainSnapshotSetInactive(vm, driver->snapshotDir) < 0)
goto cleanup;
goto endjob;
if (rc < 0)
goto cleanup;
goto endjob;
}
if (snap->def->state == VIR_DOMAIN_PAUSED) {
@ -11073,7 +11077,7 @@ static int qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
qemuDomainObjExitMonitorWithDriver(driver, vm);
if (rc < 0) {
vm->state = state;
goto cleanup;
goto endjob;
}
}
@ -11097,20 +11101,26 @@ static int qemuDomainRevertToSnapshot(virDomainSnapshotPtr snapshot,
event = virDomainEventNewFromObj(vm,
VIR_DOMAIN_EVENT_STOPPED,
VIR_DOMAIN_EVENT_STOPPED_FROM_SNAPSHOT);
if (!vm->persistent) {
if (qemuDomainObjEndJob(vm) > 0)
virDomainRemoveInactive(&driver->domains, vm);
vm = NULL;
}
}
if (qemuDomainSnapshotSetActive(vm, driver->snapshotDir) < 0)
goto cleanup;
goto endjob;
}
vm->state = snap->def->state;
ret = 0;
cleanup:
endjob:
if (vm && qemuDomainObjEndJob(vm) == 0)
vm = NULL;
cleanup:
if (event)
qemuDomainEventQueue(driver, event);
if (vm)
@ -11264,6 +11274,9 @@ static int qemuDomainSnapshotDelete(virDomainSnapshotPtr snapshot,
goto cleanup;
}
if (qemuDomainObjBeginJobWithDriver(driver, vm) < 0)
goto cleanup;
if (flags & VIR_DOMAIN_SNAPSHOT_DELETE_CHILDREN) {
rem.driver = driver;
rem.vm = vm;
@ -11272,11 +11285,15 @@ static int qemuDomainSnapshotDelete(virDomainSnapshotPtr snapshot,
virHashForEach(vm->snapshots.objs, qemuDomainSnapshotDiscardChildren,
&rem);
if (rem.err < 0)
goto cleanup;
goto endjob;
}
ret = qemuDomainSnapshotDiscard(driver, vm, snap);
endjob:
if (qemuDomainObjEndJob(vm) == 0)
vm = NULL;
cleanup:
if (vm)
virDomainObjUnlock(vm);