rbd: add support for rbd striping

RBD supports creating rbd images with
object size, stripe unit and stripe count
to support striping. This PR adds the support
for the same.

More details about striping at
https://docs.ceph.com/en/quincy/man/8/rbd/#striping

fixes: ceph#3124

Signed-off-by: Madhu Rajanna <madhupr007@gmail.com>

docs/deploy-rbd.md

@@ -66,6 +66,9 @@ make image-cephcsi
 | `mounter`                                                                                           | no                   | if set to `rbd-nbd`, use `rbd-nbd` on nodes that have `rbd-nbd` and `nbd` kernel modules to map rbd images                                                                                                                                                                                                                                                                                                                                                                                                                        |
 | `encrypted`                                                                                         | no                   | disabled by default, use `"true"` to enable LUKS encryption on PVC and `"false"` to disable it. **Do not change for existing storageclasses**                                                                                                                                                                                                                                                                                                                                                                                     |
 | `encryptionKMSID`                                                                                   | no                   | required if encryption is enabled and a kms is used to store passphrases                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+| `stripeUnit`                                                                                   | no                   | stripe unit in bytes                                                                                                                                                                                                                                                                                                                                                                                                                                                    |
+| `stripeCount`                                                                                   | no                   | objects to stripe over before looping                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
+| `objectSize`                                                                                   | no                   | object size in bytes                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
 
 **NOTE:** An accompanying CSI configuration file, needs to be provided to the
 running pods. Refer to [Creating CSI configuration](../examples/README.md#creating-csi-configuration)

e2e/rbd.go

@@ -4080,6 +4080,153 @@ var _ = Describe("RBD", func() {
 				})
 			})
 
+			By("validate rbd image stripe", func() {
+				stripeUnit := 4096
+				stripeCount := 8
+				objectSize := 131072
+				err := deleteResource(rbdExamplePath + "storageclass.yaml")
+				if err != nil {
+					e2elog.Failf("failed to delete storageclass: %v", err)
+				}
+
+				err = createRBDStorageClass(
+					f.ClientSet,
+					f,
+					defaultSCName,
+					nil,
+					map[string]string{
+						"stripeUnit":  fmt.Sprintf("%d", stripeUnit),
+						"stripeCount": fmt.Sprintf("%d", stripeCount),
+						"objectSize":  fmt.Sprintf("%d", objectSize),
+					},
+					deletePolicy)
+				if err != nil {
+					e2elog.Failf("failed to create storageclass: %v", err)
+				}
+				defer func() {
+					err = deleteResource(rbdExamplePath + "storageclass.yaml")
+					if err != nil {
+						e2elog.Failf("failed to delete storageclass: %v", err)
+					}
+					err = createRBDStorageClass(f.ClientSet, f, defaultSCName, nil, nil, deletePolicy)
+					if err != nil {
+						e2elog.Failf("failed to create storageclass: %v", err)
+					}
+				}()
+
+				err = createRBDSnapshotClass(f)
+				if err != nil {
+					e2elog.Failf("failed to create storageclass: %v", err)
+				}
+				defer func() {
+					err = deleteRBDSnapshotClass()
+					if err != nil {
+						e2elog.Failf("failed to delete VolumeSnapshotClass: %v", err)
+					}
+				}()
+
+				// create PVC and bind it to an app
+				pvc, err := loadPVC(pvcPath)
+				if err != nil {
+					e2elog.Failf("failed to load PVC: %v", err)
+				}
+
+				pvc.Namespace = f.UniqueName
+
+				err = createPVCAndvalidatePV(f.ClientSet, pvc, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to create PVC and application: %v", err)
+				}
+				// validate created backend rbd images
+				validateRBDImageCount(f, 1, defaultRBDPool)
+				validateOmapCount(f, 1, rbdType, defaultRBDPool, volumesType)
+				err = validateStripe(f, pvc, stripeUnit, stripeCount, objectSize)
+				if err != nil {
+					e2elog.Failf("failed to validate stripe: %v", err)
+				}
+
+				snap := getSnapshot(snapshotPath)
+				snap.Namespace = f.UniqueName
+				snap.Spec.Source.PersistentVolumeClaimName = &pvc.Name
+
+				err = createSnapshot(&snap, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to create snapshot: %v", err)
+				}
+				// validate created backend rbd images
+				// parent PVC + snapshot
+				totalImages := 2
+				validateRBDImageCount(f, totalImages, defaultRBDPool)
+				validateOmapCount(f, 1, rbdType, defaultRBDPool, volumesType)
+				validateOmapCount(f, 1, rbdType, defaultRBDPool, snapsType)
+				pvcClone, err := loadPVC(pvcClonePath)
+				if err != nil {
+					e2elog.Failf("failed to load PVC: %v", err)
+				}
+
+				// create clone PVC as ROX
+				pvcClone.Namespace = f.UniqueName
+				pvcClone.Spec.AccessModes = []v1.PersistentVolumeAccessMode{v1.ReadOnlyMany}
+				err = createPVCAndvalidatePV(f.ClientSet, pvcClone, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to create PVC: %v", err)
+				}
+				// validate created backend rbd images
+				// parent pvc + snapshot + clone
+				totalImages = 3
+				validateRBDImageCount(f, totalImages, defaultRBDPool)
+				validateOmapCount(f, 2, rbdType, defaultRBDPool, volumesType)
+				validateOmapCount(f, 1, rbdType, defaultRBDPool, snapsType)
+				err = validateStripe(f, pvcClone, stripeUnit, stripeCount, objectSize)
+				if err != nil {
+					e2elog.Failf("failed to validate stripe for clone: %v", err)
+				}
+				// delete snapshot
+				err = deleteSnapshot(&snap, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to delete snapshot: %v", err)
+				}
+				// delete clone pvc
+				err = deletePVCAndValidatePV(f.ClientSet, pvcClone, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to delete PVC: %v", err)
+				}
+
+				pvcSmartClone, err := loadPVC(pvcSmartClonePath)
+				if err != nil {
+					e2elog.Failf("failed to load pvcSmartClone: %v", err)
+				}
+				pvcSmartClone.Namespace = f.UniqueName
+
+				err = createPVCAndvalidatePV(f.ClientSet, pvcSmartClone, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to create pvc: %v", err)
+				}
+				// validate created backend rbd images
+				// parent pvc + temp clone + clone
+				totalImages = 3
+				validateRBDImageCount(f, totalImages, defaultRBDPool)
+				validateOmapCount(f, 2, rbdType, defaultRBDPool, volumesType)
+				err = validateStripe(f, pvcSmartClone, stripeUnit, stripeCount, objectSize)
+				if err != nil {
+					e2elog.Failf("failed to validate stripe for clone: %v", err)
+				}
+				// delete parent pvc
+				err = deletePVCAndValidatePV(f.ClientSet, pvc, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to delete PVC: %v", err)
+				}
+
+				// delete clone pvc
+				err = deletePVCAndValidatePV(f.ClientSet, pvcSmartClone, deployTimeout)
+				if err != nil {
+					e2elog.Failf("failed to delete PVC: %v", err)
+				}
+				// validate created backend rbd images
+				validateRBDImageCount(f, 0, defaultRBDPool)
+				validateOmapCount(f, 0, rbdType, defaultRBDPool, volumesType)
+			})
+
 			// Make sure this should be last testcase in this file, because
 			// it deletes pool
 			By("Create a PVC and delete PVC when backend pool deleted", func() {

e2e/rbd_helper.go

@@ -942,3 +942,69 @@ func waitToRemoveImagesFromTrash(f *framework.Framework, poolName string, t int)
 
 	return err
 }
+
+// imageInfo strongly typed JSON spec for image info.
+type imageInfo struct {
+	Name        string `json:"name"`
+	StripeUnit  int    `json:"stripe_unit"`
+	StripeCount int    `json:"stripe_count"`
+	ObjectSize  int    `json:"object_size"`
+}
+
+// getImageInfo queries rbd about the given image and returns its metadata, and returns
+// error if provided image is not found.
+func getImageInfo(f *framework.Framework, imageName, poolName string) (imageInfo, error) {
+	// rbd --format=json info [image-spec | snap-spec]
+	var imgInfo imageInfo
+
+	stdOut, stdErr, err := execCommandInToolBoxPod(
+		f,
+		fmt.Sprintf("rbd info %s %s --format json", rbdOptions(poolName), imageName),
+		rookNamespace)
+	if err != nil {
+		return imgInfo, fmt.Errorf("failed to get rbd info: %w", err)
+	}
+	if stdErr != "" {
+		return imgInfo, fmt.Errorf("failed to get rbd info: %v", stdErr)
+	}
+	err = json.Unmarshal([]byte(stdOut), &imgInfo)
+	if err != nil {
+		return imgInfo, fmt.Errorf("unmarshal failed: %w. raw buffer response: %s",
+			err, stdOut)
+	}
+
+	return imgInfo, nil
+}
+
+// validateStripe validate the stripe count, stripe unit and object size of the
+// image.
+func validateStripe(f *framework.Framework,
+	pvc *v1.PersistentVolumeClaim,
+	stripeUnit,
+	stripeCount,
+	objectSize int,
+) error {
+	imageData, err := getImageInfoFromPVC(pvc.Namespace, pvc.Name, f)
+	if err != nil {
+		return err
+	}
+
+	imgInfo, err := getImageInfo(f, imageData.imageName, defaultRBDPool)
+	if err != nil {
+		return err
+	}
+
+	if imgInfo.ObjectSize != objectSize {
+		return fmt.Errorf("objectSize %d does not match expected %d", imgInfo.ObjectSize, objectSize)
+	}
+
+	if imgInfo.StripeUnit != stripeUnit {
+		return fmt.Errorf("stripeUnit %d does not match expected %d", imgInfo.StripeUnit, stripeUnit)
+	}
+
+	if imgInfo.StripeCount != stripeCount {
+		return fmt.Errorf("stripeCount %d does not match expected %d", imgInfo.StripeCount, stripeCount)
+	}
+
+	return nil
+}

examples/rbd/storageclass.yaml

@@ -134,6 +134,14 @@ parameters:
    #       {"domainLabel":"zone","value":"zone1"}]}
    #   ]
 
+   # Image striping, Refer https://docs.ceph.com/en/latest/man/8/rbd/#striping
+   # For more details
+   # (optional) stripe unit in bytes.
+   # stripeUnit: <>
+   # (optional) objects to stripe over before looping.
+   # stripeCount: <>
+   # (optional) The object size in bytes.
+   # objectSize: <>
 reclaimPolicy: Delete
 allowVolumeExpansion: true
 mountOptions:

internal/rbd/controllerserver.go

@@ -20,6 +20,7 @@ import (
 	"context"
 	"errors"
 	"fmt"
+	"strconv"
 
 	csicommon "github.com/ceph/ceph-csi/internal/csi-common"
 	"github.com/ceph/ceph-csi/internal/util"
@@ -94,6 +95,43 @@ func (cs *ControllerServer) validateVolumeReq(ctx context.Context, req *csi.Crea
 		return err
 	}
 
+	err = validateStriping(req.Parameters)
+	if err != nil {
+		return status.Error(codes.InvalidArgument, err.Error())
+	}
+
+	return nil
+}
+
+func validateStriping(parameters map[string]string) error {
+	stripeUnit := parameters["stripeUnit"]
+	stripeCount := parameters["stripeCount"]
+	if stripeUnit != "" && stripeCount == "" {
+		return errors.New("stripeCount must be specified when stripeUnit is specified")
+	}
+
+	if stripeUnit == "" && stripeCount != "" {
+		return errors.New("stripeUnit must be specified when stripeCount is specified")
+	}
+
+	objectSize := parameters["objectSize"]
+	if objectSize != "" {
+		objSize, err := strconv.ParseUint(objectSize, 10, 64)
+		if err != nil {
+			return fmt.Errorf("failed to parse objectSize %s: %w", objectSize, err)
+		}
+		// check objectSize is power of 2
+		/*
+			Take 2^3=8 for example.
+			x & (x-1)
+			8 & 7
+			1000 & 0111 = 0000
+		*/
+		if objSize == 0 || (objSize&(objSize-1)) != 0 {
+			return fmt.Errorf("objectSize %s is not power of 2", objectSize)
+		}
+	}
+
 	return nil
 }
 

internal/rbd/controllerserver_test.go

@@ -0,0 +1,88 @@
+/*
+Copyright 2022 The Ceph-CSI Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package rbd
+
+import "testing"
+
+func TestValidateStriping(t *testing.T) {
+	t.Parallel()
+	tests := []struct {
+		name       string
+		parameters map[string]string
+		wantErr    bool
+	}{
+		{
+			name: "when stripeUnit is not specified",
+			parameters: map[string]string{
+				"stripeUnit":  "",
+				"stripeCount": "10",
+				"objectSize":  "2",
+			},
+			wantErr: true,
+		},
+		{
+			name: "when stripeCount is not specified",
+			parameters: map[string]string{
+				"stripeUnit":  "4096",
+				"stripeCount": "",
+				"objectSize":  "2",
+			},
+			wantErr: true,
+		},
+		{
+			name: "when objectSize is not power of 2",
+			parameters: map[string]string{
+				"stripeUnit":  "4096",
+				"stripeCount": "8",
+				"objectSize":  "3",
+			},
+			wantErr: true,
+		},
+		{
+			name: "when objectSize is 0",
+			parameters: map[string]string{
+				"stripeUnit":  "4096",
+				"stripeCount": "8",
+				"objectSize":  "0",
+			},
+			wantErr: true,
+		},
+		{
+			name: "when valid stripe parameters are specified",
+			parameters: map[string]string{
+				"stripeUnit":  "4096",
+				"stripeCount": "8",
+				"objectSize":  "131072",
+			},
+			wantErr: false,
+		},
+		{
+			name:       "when no stripe parameters are specified",
+			parameters: map[string]string{},
+			wantErr:    false,
+		},
+	}
+	for _, tt := range tests {
+		ts := tt
+		t.Run(ts.name, func(t *testing.T) {
+			t.Parallel()
+			if err := validateStriping(ts.parameters); (err != nil) != ts.wantErr {
+				t.Errorf("validateStriping() error = %v, wantErr %v", err, ts.wantErr)
+			}
+		})
+	}
+}