failed to mount ext4 bcache device to pod

[snwyc]

What happened:
含有bcache卷的pvc挂载pod失败

What you expected to happen:
含有bcache卷的pvc挂载pod成功

How to reproduce it:

1. 创建一个bcache的sc: carina-lvm-cache-lvm-xfs: 指定csi.storage.k8s.io/fstype: xfs
2. 创建一个pvc: pvc-carina-lvm-cache-lvm-xfs，并挂载到deploy: test-carina-cache-lvm-xfs
3. 删除以上的deploy和pvc
4. 创建一个bcache的sc: carina-lvm-cache-lvm-ext4 : 指定csi.storage.k8s.io/fstype: ext4
5. 创建一个pvc: pvc-carina-lvm-cache-lvm-ext4, 并挂载到deploy: test-carina-cache-lvm-ext4

Anything else we need to know?:

• pod日志 kubectl describe po test-carina-cache-lvm-ext4-7f47ff4ffc-dhlw9：

                             node.kubernetes.io/unreachable:NoExecute op=Exists for 300s
Events:
  Type     Reason       Age                 From              Message
  ----     ------       ----                ----              -------
  Normal   Scheduled    101s                carina-scheduler  Successfully assigned default/test-carina-cache-lvm-ext4-7f47ff4ffc-dhlw9 to node1
  Warning  FailedMount  101s                kubelet           MountVolume.SetUp failed for volume "pvc-398b8538-08ab-4f29-99a7-462a06833ece" : rpc error: code = Internal desc = target device is already formatted with different filesystem: volume=volume-pvc-398b8538-08ab-4f29-99a7-462a06833ece, current=xfs, new:ext4
  Warning  FailedMount  37s (x7 over 101s)  kubelet           MountVolume.SetUp failed for volume "pvc-398b8538-08ab-4f29-99a7-462a06833ece" : rpc error: code = Unknown desc = exit status 1

• 日志

2023-02-28T17:28:24.252+0800    debug   exec/exec.go:266        Can't open dev /dev/carina-cache-lvm/volume-cache-8b8538-08ab-4f29-99a7-462a06833ece: Device or resource busy
2023-02-28T17:28:24.252+0800    error   volume/volume.go:387    create bcache failed device /dev/carina-lvm/volume-pvc-398b8538-08ab-4f29-99a7-462a06833ece cache device /dev/carina-cache-lvm/volume-cache-8b8538-08ab-4f29-99a7-462a06833ece error exit status 1

Environment:

• CSI Driver version:
• Kubernetes version (use kubectl version):
• OS (e.g. from /etc/os-release):
• Kernel (e.g. uname -a):
• Install tools:
• Others: