feat: add func BdevLvolGetWithFilter

Longhorn 9121

Signed-off-by: Shuo Wu <shuo.wu@suse.com>

pkg/spdk/client/basic.go

@@ -250,6 +250,19 @@ func (c *Client) BdevLvolDelete(name string) (deleted bool, err error) {
 //
 //		"timeout": Optional. 0 by default, meaning the method returns immediately whether the lvol bdev exists or not.
 func (c *Client) BdevLvolGet(name string, timeout uint64) (bdevLvolInfoList []spdktypes.BdevInfo, err error) {
+	return c.BdevLvolGetWithFilter(name, timeout, func(*spdktypes.BdevInfo) bool { return true })
+}
+
+// BdevLvolGetWithFilter gets information about some specific lvol bdevs.
+//
+//		"name": Optional. UUID or alias of a logical volume (lvol) bdev.
+//	        	The alias of a lvol bdev is <LVSTORE NAME>/<LVOL NAME>. And the name of a lvol bdev is UUID.
+//			 	If this is not specified, the function will list all lvol bdevs.
+//
+//		"timeout": Optional. 0 by default, meaning the method returns immediately whether the lvol bdev exists or not.
+//
+//		"filter": Only the lvol bdevs that pass the filter will be returned.
+func (c *Client) BdevLvolGetWithFilter(name string, timeout uint64, filter func(*spdktypes.BdevInfo) bool) (bdevLvolInfoList []spdktypes.BdevInfo, err error) {
 	req := spdktypes.BdevGetBdevsRequest{
 		Name:    name,
 		Timeout: timeout,
@@ -269,7 +282,9 @@ func (c *Client) BdevLvolGet(name string, timeout uint64) (bdevLvolInfoList []sp
 		if spdktypes.GetBdevType(&b) != spdktypes.BdevTypeLvol {
 			continue
 		}
-
+		if !filter(&b) {
+			continue
+		}
 		b.DriverSpecific.Lvol.Xattrs = make(map[string]string)
 		user_created, err := c.BdevLvolGetXattr(b.Name, UserCreated)
 		if err == nil {

pkg/spdk/spdk_test.go

@@ -161,9 +161,22 @@ func (s *TestSuite) TestSPDKBasic(c *C) {
 		c.Assert(deleted, Equals, true)
 	}()
 
-	lvolList, err := spdkCli.BdevLvolGet("", 0)
+	lvolFilter1 := func(bdev *spdktypes.BdevInfo) bool {
+		return bdev.DriverSpecific.Lvol != nil && bdev.UUID == lvolUUID1
+	}
+	lvolList1, err := spdkCli.BdevLvolGetWithFilter("", 0, lvolFilter1)
 	c.Assert(err, IsNil)
-	c.Assert(len(lvolList), Equals, 2)
+	c.Assert(len(lvolList1), Equals, 1)
+	c.Assert(lvolList1[0].Aliases[0], Equals, fmt.Sprintf("%s/%s", lvsName, lvolName1))
+	lvolFilter2 := func(bdev *spdktypes.BdevInfo) bool {
+		return bdev.DriverSpecific.Lvol != nil && bdev.UUID == lvolUUID2
+	}
+	lvolList2, err := spdkCli.BdevLvolGetWithFilter(lvolUUID2, 0, lvolFilter2)
+	c.Assert(err, IsNil)
+	c.Assert(len(lvolList2), Equals, 1)
+	c.Assert(lvolList2[0].Aliases[0], Equals, fmt.Sprintf("%s/%s", lvsName, lvolName2))
+
+	lvolList := append(lvolList1, lvolList2...)
 	for _, lvol := range lvolList {
 		c.Assert(len(lvol.Aliases), Equals, 1)
 		c.Assert(uint64(lvol.BlockSize)*lvol.NumBlocks, Equals, defaultLvolSizeInMiB*types.MiB)
@@ -175,12 +188,6 @@ func (s *TestSuite) TestSPDKBasic(c *C) {
 		c.Assert(lvol.DriverSpecific.Lvol.Snapshot, Equals, false)
 		c.Assert(lvol.DriverSpecific.Lvol.Clone, Equals, false)
 		c.Assert(lvol.DriverSpecific.Lvol.LvolStoreUUID, Equals, lvsUUID)
-		if lvol.UUID == lvolUUID1 {
-			c.Assert(lvol.Aliases[0], Equals, fmt.Sprintf("%s/%s", lvsName, lvolName1))
-		}
-		if lvol.UUID == lvolUUID2 {
-			c.Assert(lvol.Aliases[0], Equals, fmt.Sprintf("%s/%s", lvsName, lvolName2))
-		}
 		c.Assert(lvol.DriverSpecific.Lvol.Xattrs[client.UserCreated], Equals, "true")
 		c.Assert(lvol.DriverSpecific.Lvol.Xattrs[client.SnapshotTimestamp], Equals, "")
 	}