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- CSI drivers now have access to mountOptions defined on the storage class when attaching volumes. ([#67898](https://github.com/kubernetes/kubernetes/pull/67898), [@bswartz](https://github.com/bswartz))

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### API Machinery

Extensibility. SIG API Machinery added a new class of admission control webhooks (mutating), and brought the admission control webhooks to beta.

### Apps

* Set fsGroup by securityContext.fsGroup in azure file. However,f user both sets gid=xxx in mountOptions in azure storage class and securityContext.fsGroup, gid=xxx setting in mountOptions takes precedence. ([#58316](https://github.com/kubernetes/kubernetes/pull/58316), [@andyzhangx](https://github.com/andyzhangx))

- `diskformat` storage class parameter for in-tree vSphere volume plugin is deprecated as of v1.21 release. Please consider updating storageclass and remove `diskformat` parameter. vSphere CSI Driver does not support diskformat storageclass parameter.
  

- Fixed a bug where Kubernetes would apply a default StorageClass to a PersistentVolumeClaim,
  even when the deprecated annotation `volume.beta.kubernetes.io/storage-class` was set. ([#116089](https://github.com/kubernetes/kubernetes/pull/116089), [@cvvz](https://github.com/cvvz)) [SIG Apps and Storage]

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* ScaleIO persistent volumes now support referencing a secret in a namespace other than the bound persistent volume claim's namespace; this is controlled during provisioning with the `secretNamespace` storage class parameter; StoragePool and ProtectionDomain attributes no longer defaults to the value `default` ([#54013](https://github.com/kubernetes/kubernetes/pull/54013), [@vladimirvivien](https://github.com/vladimirvivien))