Akihiro Suda 5cc915c26c overlay: add Supported() checker ...

This function is not called during plugin initialization (#2140),
but should be useful for downstream projects that uses overlayfs
snapshotter as a Go library.

Benchmark result on Ubuntu 17.10, GCE n1-standard-4:

BenchmarkOverlaySupportedOnExt4-4                    100          20490598 ns/op
BenchmarkOverlayUnsupportedOnFType0XFS-4           30000             39316 ns/op
BenchmarkOverlaySupportedOnFType1XFS-4               100          19287083 ns/op
BenchmarkOverlayUnsupportedOnFAT-4                   100          14217772 ns/op

i.e. the overhead is typically about 20 msec on this machine.

Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>

2018-03-06 16:53:21 +09:00

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