cephfs: Fix cephfs PVC sizing

Issue:
The RoundOffCephFSVolSize() function omits the fractional
part when calculating the size for cephfs volumes, leading
to the created volume capacity to be lesser than the requested
volume capacity.

Fix:
Consider the fractional part during the size calculation so the
rounded off volume size will be greater than or equal to the
requested volume size.

Signed-off-by: karthik-us <ksubrahm@redhat.com>
Fixes: #4179

internal/util/util.go

@@ -67,9 +67,9 @@ func RoundOffCephFSVolSize(bytes int64) int64 {
 		return 4 * helpers.MiB
 	}
 
-	bytes /= helpers.MiB
+	floatbytes := float64(bytes) / helpers.MiB
 
-	bytes = int64(math.Ceil(float64(bytes)/4) * 4)
+	bytes = int64(math.Ceil(floatbytes/4) * 4)
 
 	return RoundOffBytes(bytes * helpers.MiB)
 }

internal/util/util_test.go

@@ -375,6 +375,16 @@ func TestRoundOffCephFSVolSize(t *testing.T) {
 			1677722,
 			4194304, // 4 MiB
 		},
+		{
+			"101MB conversion",
+			101000000,
+			104857600, // 100MiB
+		},
+		{
+			"500MB conversion",
+			500000000,
+			503316480, // 480MiB
+		},
 		{
 			"1023MiB conversion",
 			1072693248,