storage e2e: make read-only block optional

[msau42]

Which jobs are failing:

vsphere CSI

Which test(s) are failing:

CSI Volumes [Testpattern: Dynamic PV (block volmode)] multiVolume [Slow] should concurrently access the single read-only volume from pods on the same node

Since when has it been failing:

since the test was introduced

Testgrid link:

n/a

Reason for failure:

FailedMapVolume: MapVolume.MapPodDevice failed for volume "pvc-5ccaf85d-af04-4c7f-a2b6-aeb239f33e96" : rpc error: code = InvalidArgument desc = read only not supported for Block Volume

Anything else we need to know:

[msau42]

This test tries to set pod.volumes.readonly in block mode which I think most volume plugins don't support. I think read-only block can only be enforced at attach-level, not node stage/publish level.

I double checked pd csi implementation to see why the test is passing there, and it's not enforcing/checking, but it probably should since the device ends up writable to the pod. cc @mattcary

@jsafrane do you think it makes sense to make this test case a plugin capability?

@kubernetes/sig-storage-test-failures

[jsafrane]

read-only block volume is indeed weird and I would not mind if we don't test it. However, it is possible to achieve with podman or docker: docker run -ti --device /dev/mapper/ssd-test:/dev/test:r centos:8. The device looks writable (has w bit), but all writes fail. I did not check if we have similar functionality it in CRI.

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[msau42]

/remove-lifecycle rotten

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[mattcary]

/cc @leiyiz I think this relates to your ROX fix (is this test checking the mistaken behavior that our customer was trying to do)?

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[mattcary]

/remove-lifecycle rotten

/cc @leiyiz

This is different from the ROX read-only issue you've been looking at Leiyi, but maybe similar enough it could be cleaned up at the same time?

[leiyiz]

I double checked pd csi implementation to see why the test is passing there, and it's not enforcing/checking, but it probably should since the device ends up writable to the pod

I think the ROX fix PR has only enforced mounting at stage and next step is to see if attach step enforced with csi.readonly set

[leiyiz]

if the csi.readonly is set, attacher will take it and pass to pdcsi driver in the ControllerPublishVolumeRequest. So this should be working

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/lifecycle rotten

[jsafrane]

/remove-lifecycle rotten

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/close

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@k8s-triage-robot: Closing this issue.

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[msau42]

/reopen

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@msau42: Reopened this issue.

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[msau42]

/remove-lifecycle rotten

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/lifecycle rotten

[msau42]

/remove-lifecycle rotten
/triage accepted
/priority important-longterm

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/remove-triage accepted

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