rbd: Adding ListChildrenWithParams Api

Api retrieves Image,Pool and Trash details of the existing Children.

Signed-off-by: ShravaniVangur <[email protected]>

docs/api-status.json

@@ -1766,6 +1766,10 @@
         "name": "Image.ListChildren",
         "comment": "ListChildren returns arrays with the pools and names of the images that are\nchildren of the given image. The index of the pools and images arrays can be\nused to link the two items together.\n\nImplements:\n  int rbd_list_children3(rbd_image_t image, rbd_linked_image_spec_t *images,\n                         size_t *max_images);\n"
       },
+      {
+        "name": "Image.ListChildrenAttributes",
+        "comment": "ListChildrenAttributes returns an array of struct with the names and ids of the\nimages and pools and the trash of the images that are children of the given image.\n\nImplements:\n  int rbd_list_children3(rbd_image_t image, rbd_linked_image_spec_t *images,\n                         size_t *max_images);\n"
+      },
       {
         "name": "Image.SetSnapByID",
         "comment": "SetSnapByID updates the rbd image (not the Snapshot) such that the snapshot\nis the source of readable data.\n\nImplements:\n int rbd_snap_set_by_id(rbd_image_t image, uint64_t snap_id);\n"

rbd/list_children_attributes_test.go

@@ -0,0 +1,188 @@
+package rbd
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestListChildrenAttributes(t *testing.T) {
+	conn := radosConnect(t)
+	defer conn.Shutdown()
+
+	poolName := GetUUID()
+	err := conn.MakePool(poolName)
+	require.NoError(t, err)
+	defer conn.DeletePool(poolName)
+
+	ioctx, err := conn.OpenIOContext(poolName)
+	require.NoError(t, err)
+	defer ioctx.Destroy()
+
+	namespace := "ns01"
+	err = NamespaceCreate(ioctx, namespace)
+	assert.NoError(t, err)
+
+	ioctx.SetNamespace(namespace)
+
+	parentName := "parent"
+	img, err := Create(ioctx, parentName, testImageSize, testImageOrder, 1)
+	assert.NoError(t, err)
+	defer img.Remove()
+
+	img, err = OpenImage(ioctx, parentName, NoSnapshot)
+	assert.NoError(t, err)
+	defer img.Close()
+
+	snapName := "snapshot"
+	snapshot, err := img.CreateSnapshot(snapName)
+	assert.NoError(t, err)
+	defer snapshot.Remove()
+
+	err = snapshot.Protect()
+	assert.NoError(t, err)
+
+	snapImg, err := OpenImage(ioctx, parentName, snapName)
+	assert.NoError(t, err)
+	defer snapImg.Close()
+
+	// ensure no children prior to clone
+	result, err := snapImg.ListChildrenAttributes()
+	assert.NoError(t, err)
+	assert.Equal(t, len(result), 0, "List should be empty before cloning")
+
+	//create first child image
+	childImage01 := "childImage01"
+	_, err = img.Clone(snapName, ioctx, childImage01, 1, testImageOrder)
+	assert.NoError(t, err)
+
+	_, err = OpenImage(ioctx, childImage01, NoSnapshot)
+	require.NoError(t, err, "Failed to open cloned child image")
+
+	//retrieve and validate child image properties
+	result, err = snapImg.ListChildrenAttributes()
+	assert.NoError(t, err)
+	assert.Equal(t, len(result), 1, "List should contain one child image")
+
+	assert.Equal(t, childImage01, result[0].ImageName)
+	assert.NotNil(t, result[0].ImageID)
+	assert.NotNil(t, result[0].PoolID)
+	assert.Equal(t, poolName, result[0].PoolName)
+	assert.Equal(t, namespace, result[0].PoolNamespace)
+	assert.False(t, result[0].Trash, "Newly cloned image should not be in trash")
+
+	//parent image cannot be deleted while having children attached to it
+	err = img.Remove()
+	assert.Error(t, err, "Expected an error but got nil")
+
+	childImg1, err := OpenImage(ioctx, childImage01, NoSnapshot)
+	assert.NoError(t, err)
+	defer childImg1.Close()
+
+	//trash the image and validate
+	err = childImg1.Trash(0)
+	assert.NoError(t, err, "Failed to move child image to trash")
+
+	result, err = snapImg.ListChildrenAttributes()
+	assert.NoError(t, err)
+	assert.True(t, result[0].Trash, "Child image should be marked as trashed")
+
+	//validate for multiple clones by creating second child image
+	childImage02 := "childImage02"
+	_, err = img.Clone(snapName, ioctx, childImage02, 1, testImageOrder)
+	assert.NoError(t, err)
+
+	result, err = snapImg.ListChildrenAttributes()
+	assert.NoError(t, err)
+	require.Len(t, result, 2, "List should contain two child images")
+	assert.Equal(t, childImage02, result[1].ImageName)
+
+	//the first image is trashed where as the second is not
+	expectedChildren := map[string]bool{
+		childImage01: true,
+		childImage02: false,
+	}
+
+	for _, child := range result {
+		exists := expectedChildren[child.ImageName]
+		assert.Equal(t, exists, child.Trash)
+	}
+
+	childImg2, err := OpenImage(ioctx, childImage02, NoSnapshot)
+	require.NoError(t, err, "Failed to open cloned child image")
+	defer childImg2.Close()
+
+	//flattening the image should detach it from the parent and remove it from ListChildrenAttributes
+	err = childImg2.Flatten()
+	assert.NoError(t, err, "Failed to flatten cloned child image")
+
+	result, err = snapImg.ListChildrenAttributes()
+	assert.NoError(t, err)
+	assert.Equal(t, len(result), 1, "List should not contain the second image after flattening the clone")
+	assert.NotEqual(t, childImage02, result[0].ImageName)
+}
+
+func TestCloneInDifferentPool(t *testing.T) {
+	conn := radosConnect(t)
+	defer conn.Shutdown()
+
+	//create two pools:poolA(parent) and poolB(child)
+	poolA := GetUUID()
+	err := conn.MakePool(poolA)
+	require.NoError(t, err)
+	defer conn.DeletePool(poolA)
+
+	poolB := GetUUID()
+	err = conn.MakePool(poolB)
+	require.NoError(t, err)
+	defer conn.DeletePool(poolB)
+
+	//ensure that both the pools are not the same
+	assert.NotEqual(t, poolA, poolB)
+
+	ioctxA, err := conn.OpenIOContext(poolA)
+	require.NoError(t, err)
+	defer ioctxA.Destroy()
+	ioctxB, err := conn.OpenIOContext(poolB)
+	require.NoError(t, err)
+	defer ioctxB.Destroy()
+
+	//create a parent image in poolA
+	parentName := "parent-image"
+	img, err := Create(ioctxA, parentName, testImageSize, testImageOrder, 1)
+	assert.NoError(t, err)
+
+	img, err = OpenImage(ioctxA, parentName, NoSnapshot)
+	assert.NoError(t, err)
+	defer img.Close()
+
+	snapName := "snap01"
+	snapshot, err := img.CreateSnapshot(snapName)
+	assert.NoError(t, err)
+	defer snapshot.Remove()
+
+	err = snapshot.Protect()
+	assert.NoError(t, err)
+
+	snapImg, err := OpenImage(ioctxA, parentName, snapName)
+	assert.NoError(t, err)
+	defer snapImg.Close()
+
+	//create a child image in poolB
+	childImageName := "child-image"
+	_, err = img.Clone(snapName, ioctxB, childImageName, 1, testImageOrder)
+	assert.NoError(t, err, "Failed to clone image into poolB")
+
+	_, err = OpenImage(ioctxB, childImageName, NoSnapshot)
+	require.NoError(t, err, "Failed to open cloned child image in poolB")
+
+	//verify and validate properties of the child image
+	result, err := snapImg.ListChildrenAttributes()
+	assert.NoError(t, err)
+	require.Len(t, result, 1, "List should contain one child image")
+
+	child := result[0]
+	assert.Equal(t, childImageName, child.ImageName, "Child image name should match")
+	assert.Equal(t, poolB, child.PoolName, "Child image should be in poolB")
+}

rbd/snapshot_nautilus.go

@@ -168,6 +168,50 @@ func (image *Image) ListChildren() (pools []string, images []string, err error)
 	return pools, images, nil
 }
 
+// ListChildrenAttributes returns an array of struct with the names and ids of the
+// images and pools and the trash of the images that are children of the given image.
+//
+// Implements:
+//
+//	int rbd_list_children3(rbd_image_t image, rbd_linked_image_spec_t *images,
+//	                       size_t *max_images);
+func (image *Image) ListChildrenAttributes() (imgSpec []ImageSpec, err error) {
+	if err := image.validate(imageIsOpen); err != nil {
+		return nil, err
+	}
+	var (
+		csize    C.size_t
+		children []C.rbd_linked_image_spec_t
+	)
+	retry.WithSizes(16, 4096, func(size int) retry.Hint {
+		csize = C.size_t(size)
+		children = make([]C.rbd_linked_image_spec_t, csize)
+		ret := C.rbd_list_children3(
+			image.image,
+			(*C.rbd_linked_image_spec_t)(unsafe.Pointer(&children[0])),
+			&csize)
+		err = getErrorIfNegative(ret)
+		return retry.Size(int(csize)).If(err == errRange)
+	})
+	if err != nil {
+		return nil, err
+	}
+	defer C.rbd_linked_image_spec_list_cleanup((*C.rbd_linked_image_spec_t)(unsafe.Pointer(&children[0])), csize)
+
+	imgSpec = make([]ImageSpec, csize)
+	for i, child := range children[:csize] {
+		imgSpec[i] = ImageSpec{
+			ImageName:     C.GoString(child.image_name),
+			ImageID:       C.GoString(child.image_id),
+			PoolName:      C.GoString(child.pool_name),
+			PoolNamespace: C.GoString(child.pool_namespace),
+			PoolID:        uint64(child.pool_id),
+			Trash:         bool(child.trash),
+		}
+	}
+	return imgSpec, nil
+}
+
 // SetSnapByID updates the rbd image (not the Snapshot) such that the snapshot
 // is the source of readable data.
 //