public override void deleteISCSIExtent(iscsiExtent extent)
{
lock (this)
{
waitingISCSIOperations++;
}
try
{
uncachedNAS.deleteISCSIExtent(extent);
iscsiExtent foo;
extents.TryRemove(extent.id, out foo);
var toDel = TTEExtents.Where(x => x.Value.iscsi_extent == extent.id);
foreach (var tte in toDel)
{
iscsiTargetToExtentMapping removedTTE;
TTEExtents.TryRemove(tte.Key, out removedTTE);
}
}
finally
{
lock (this)
{
waitingISCSIOperations--;
}
markThisThreadISCSIDirty();
}
}
private static iscsiExtent getExtent(NASAccess nas, string snapshotFullName)
{
iscsiExtent extent =
nas.getExtents()
.SingleOrDefault(
x => snapshotFullName.Equals(x.iscsi_target_extent_name, StringComparison.CurrentCultureIgnoreCase));
return(extent);
}
private static snapshotObjects getSnapshotObjectsFromNAS(NASAccess nas, string snapshotFullName)
{
snapshot shotToRestore = getSnapshot(nas, snapshotFullName);
if (shotToRestore == null)
{
nas.invalidateSnapshots();
shotToRestore = getSnapshot(nas, snapshotFullName);
if (shotToRestore == null)
{
throw new Exception("Cannot find snapshot " + snapshotFullName);
}
}
// Now find the extent. We'll need to delete it before we can rollback the snapshot.
iscsiExtent extent = getExtent(nas, snapshotFullName);
if (extent == null)
{
nas.invalidateExtents();
extent = getExtent(nas, snapshotFullName);
if (extent == null)
{
throw new Exception("Cannot find extent " + snapshotFullName);
}
}
// Find the 'target to extent' mapping, since this will need to be deleted before we can delete the extent.
iscsiTargetToExtentMapping tgtToExtent = getTgtToExtent(nas, extent);
if (tgtToExtent == null)
{
nas.invalidateTargetToExtents();
tgtToExtent = getTgtToExtent(nas, extent);
if (tgtToExtent == null)
{
throw new Exception("Cannot find target-to-extent mapping with ID " + extent.id + " for snapshot " + shotToRestore.name);
}
}
// We find the target, as well, just to be sure that our cache is correct.
if (nas.getISCSITargets().Count(x => x.id == tgtToExtent.iscsi_target) == 0)
{
nas.invalidateTargets();
if (nas.getISCSITargets().Count(x => x.id == tgtToExtent.iscsi_target) == 0)
{
throw new Exception("Cannot find target for snapshot " + snapshotFullName);
}
}
return(new snapshotObjects()
{
extent = extent,
shotToRestore = shotToRestore,
tgtToExtent = tgtToExtent
});
}
public override void deleteISCSIExtent(iscsiExtent extent)
{
lock (events)
{
events.Add(new mockedCall("deleteISCSIExtent", "extent: " + extent));
}
lock (extents)
{
extents.Remove(extent.id);
}
}
public override iscsiExtent addISCSIExtent(iscsiExtent extent)
{
lock (events)
{
events.Add(new mockedCall("addISCSIExtent", "extent: '" + extent));
}
lock (extents)
{
string newID = idGen.Next().ToString();
extent.id = newID;
extents.Add(newID, extent);
return(extents[newID]);
}
}
public static void restoreSnapshot <T>(hypervisorWithSpec <T> hyp, FreeNASWithCaching nas, cancellableDateTime deadline)
{
hypSpec_withWindbgKernel _spec = hyp.getBaseConnectionSpec();
// Find the device snapshot, so we can get information about it needed to get the ISCSI volume
snapshotObjects shotObjects = getSnapshotObjectsFromNAS(nas, _spec.snapshotFullName);
// Here we power the server down, tell the iSCSI server to use the right image, and power it back up again.
hyp.powerOff();
// Now we can get started. We must remove the 'target to extent' mapping, then the extent. Then we can safely roll back
// the ZFS snapshot, and then re-add the extent and mapping. We use a finally block so that it is less likely we will
// leave the NAS object in an inconsistent state.
// Note that removing the target will also remove any 'target to extent' mapping, so we don't need to do that explicitly.
// FreeNAS will take care of it for us.
nas.deleteISCSIExtent(shotObjects.extent);
nas.waitUntilISCSIConfigFlushed();
try
{
// Roll back the snapshot. Use a retry, since FreeNAS is complaining the dataset is in use occasionally.
int retries = 100;
while (true)
{
try
{
nas.rollbackSnapshot(shotObjects.shotToRestore);
break;
}
catch (Exception)
{
if (retries-- == 0)
{
throw;
}
deadline.doCancellableSleep(TimeSpan.FromSeconds(6)); // 6 sec * 100 retries = ten minutes
}
}
}
finally
{
// Re-add the extent and target-to-extent mapping. Use the same target ID as the old target-to-extent used, and
// the new extent's ID.
iscsiExtent newExtent = nas.addISCSIExtent(shotObjects.extent);
nas.addISCSITargetToExtent(shotObjects.tgtToExtent.iscsi_target, newExtent);
nas.waitUntilISCSIConfigFlushed();
}
}
public override iscsiExtent addISCSIExtent(iscsiExtent extent)
{
if (String.IsNullOrEmpty(extent.iscsi_target_extent_disk))
{
extent.iscsi_target_extent_disk = extent.iscsi_target_extent_path;
}
// See freenas bug 11296: "type is Disk, but you need to use iscsi_target_extent_disk"
// ... "start it with zvol instead of dev/zvol"
if (extent.iscsi_target_extent_disk.StartsWith("/dev/zvol", StringComparison.CurrentCultureIgnoreCase))
{
extent.iscsi_target_extent_disk = extent.iscsi_target_extent_disk.Substring(5);
}
if (extent.iscsi_target_extent_type == "ZVOL")
{
extent.iscsi_target_extent_type = "Disk"; // You're a Disk now, 'arry
}
string diskNameOrFilePath;
if (extent.iscsi_target_extent_type == "File")
{
diskNameOrFilePath = String.Format("\"iscsi_target_extent_path\": \"{0}\" ", extent.iscsi_target_extent_path);
}
else if (extent.iscsi_target_extent_type == "Disk")
{
diskNameOrFilePath = String.Format("\"iscsi_target_extent_disk\": \"{0}\" ", extent.iscsi_target_extent_disk);
}
else
{
throw new ArgumentException("iscsi_target_extent_type");
}
string payload = String.Format("{{" +
"\"iscsi_target_extent_type\": \"{0}\", " +
"\"iscsi_target_extent_name\": \"{1}\", " +
"{2}" +
"}}",
extent.iscsi_target_extent_type,
extent.iscsi_target_extent_name,
diskNameOrFilePath);
return(doReqForJSON <iscsiExtent>("http://" + _serverIp + "/api/v1.0/services/iscsi/extent/", "POST", HttpStatusCode.Created, payload));
}
public override iscsiExtent addISCSIExtent(iscsiExtent extent)
{
lock (this)
{
waitingISCSIOperations++;
}
iscsiExtent newVal;
try
{
newVal = uncachedNAS.addISCSIExtent(extent);
extents.TryAdd(newVal.id, newVal);
}
finally
{
lock (this)
{
waitingISCSIOperations--;
}
markThisThreadISCSIDirty();
}
return(newVal);
}
public override iscsiTargetToExtentMapping addISCSITargetToExtent(string iscsiTargetID, iscsiExtent newExtent)
{
lock (events)
{
events.Add(new mockedCall("addISCSITargetToExtent", "iscsiTarget: '" + iscsiTargetID + "' newExtent: " + newExtent));
}
lock (tgtToExtents)
{
string newID = idGen.Next().ToString();
iscsiTargetToExtentMapping newMapping = new iscsiTargetToExtentMapping()
{
id = newID, iscsi_target = iscsiTargetID, iscsi_extent = newExtent.id, iscsi_lunid = "0"
};
tgtToExtents.Add(newID, newMapping);
return(tgtToExtents[newID]);
}
}
public abstract void deleteISCSIExtent(iscsiExtent extent);
public abstract iscsiExtent addISCSIExtent(iscsiExtent extent);
public abstract iscsiTargetToExtentMapping addISCSITargetToExtent(string iscsiTargetID, iscsiExtent newExtent);
public override iscsiTargetToExtentMapping addISCSITargetToExtent(string iscsiTargetID, iscsiExtent newExtent)
{
lock (this)
{
waitingISCSIOperations++;
}
iscsiTargetToExtentMapping newMapping;
try
{
newMapping = uncachedNAS.addISCSITargetToExtent(iscsiTargetID, newExtent);
TTEExtents.TryAdd(newMapping.id, newMapping);
}
finally
{
lock (this)
{
waitingISCSIOperations--;
}
markThisThreadISCSIDirty();
}
return(newMapping);
}
private static iscsiTargetToExtentMapping getTgtToExtent(NASAccess nas, iscsiExtent extent)
{
iscsiTargetToExtentMapping tgtToExtent = nas.getTargetToExtents().SingleOrDefault(x => x.iscsi_extent == extent.id);
return(tgtToExtent);
}
public override iscsiTargetToExtentMapping addISCSITargetToExtent(string targetID, iscsiExtent extent)
{
string payload = String.Format("{{" +
"\"iscsi_target\": \"{0}\", " +
"\"iscsi_extent\": \"{1}\", " +
"\"iscsi_lunid\": null " +
"}}", targetID, extent.id);
return(doReqForJSON <iscsiTargetToExtentMapping>("http://" + _serverIp + "/api/v1.0/services/iscsi/targettoextent/", "POST", HttpStatusCode.Created, payload));
}
public override void deleteISCSIExtent(iscsiExtent extent)
{
string url = String.Format("http://{0}/api/v1.0/services/iscsi/extent/{1}/", _serverIp, extent.id);
doReq(url, "DELETE", HttpStatusCode.NoContent);
}
