enabled discard option

[slavkap]

Description

Enable the discard option for virtio-blk and virtio-scsi devices for volumes on StorPool storage

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• build/CI
• test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

How Has This Been Tested?

manually tested with different controllers and UEFI legacy/secured
deploy a VM
attach volume

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 16.06%. Comparing base (c94d0ab) to head (63e0cd6).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...ud/hypervisor/kvm/storage/StorPoolStoragePool.java	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #10077      +/-   ##
============================================
- Coverage     16.06%   16.06%   -0.01%     
- Complexity    12862    12863       +1     
============================================
  Files          5641     5642       +1     
  Lines        493791   493856      +65     
  Branches      59858    59860       +2     
============================================
+ Hits          79318    79326       +8     
- Misses       405691   405749      +58     
+ Partials       8782     8781       -1     

Flag	Coverage Δ
uitests	4.02% <ø> (ø)
unittests	16.90% <0.00%> (-0.01%)	⬇️

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[BryanMLima]

CLGTM

[DaanHoogland]

Code looks ok, but we need to rely on your testing, @slavkap !

[shwstppr]

Code LGTM.

minor: @slavkap would something like this improve readability?

--- a/plugins/storage/volume/storpool/src/main/java/com/cloud/hypervisor/kvm/storage/StorPoolStoragePool.java
+++ b/plugins/storage/volume/storpool/src/main/java/com/cloud/hypervisor/kvm/storage/StorPoolStoragePool.java
@@ -16,11 +16,13 @@
 // under the License.
 package com.cloud.hypervisor.kvm.storage;
 
+import java.util.Arrays;
 import java.util.List;
 import java.util.Map;
 
 import org.apache.cloudstack.utils.qemu.QemuImg.PhysicalDiskFormat;
 
+import com.cloud.hypervisor.kvm.resource.LibvirtVMDef;
 import com.cloud.storage.Storage;
 import com.cloud.storage.Storage.StoragePoolType;
 
@@ -35,6 +37,11 @@ public class StorPoolStoragePool implements KVMStoragePool {
     private String _sourceDir;
     private String _localPath;
 
+    private static final List<LibvirtVMDef.DiskDef.DiskBus> supportedBusTypes = Arrays.asList(
+            LibvirtVMDef.DiskDef.DiskBus.VIRTIO,
+            LibvirtVMDef.DiskDef.DiskBus.SCSI
+    );
+
     public StorPoolStoragePool(String uuid, String host, int port, StoragePoolType storagePoolType, StorageAdaptor storageAdaptor) {
         _uuid = uuid;
         _sourceHost = host;
@@ -166,4 +173,11 @@ public class StorPoolStoragePool implements KVMStoragePool {
     public Map<String, String> getDetails() {
         return null;
     }
+
+    public void customizeLibvirtDiskDef(LibvirtVMDef.DiskDef disk) {
+        if (!supportedBusTypes.contains(disk.getBusType())) {
+            return;
+        }
+        disk.setDiscard(LibvirtVMDef.DiskDef.DiscardType.UNMAP);
+    }
 }