In eoan we shipped:

57d53162face UBUNTU: SAUCE: Revert "s390/dasd: Add discard support for
ESE volumes"


And as it is a SAUCE patch, we continue to ship it, as we don't implicitely 
drop them:

964ce509e2de Revert "s390/dasd: Add discard support for ESE volumes"

Currently if you grep for DASD_FEATURE_DISCARD:
$ git grep DASD_FEATURE_DISCARD
arch/s390/include/uapi/asm/dasd.h:#define DASD_FEATURE_DISCARD        0x080
drivers/s390/block/dasd_fba.c:  dasd_set_feature(cdev, DASD_FEATURE_DISCARD, 1);

It is only enabled for the FBA devices.

Since the original request to disable DISCARD for ESE volumes, we have
not re-enabled them.

So what is the purporse of this request? Do you want us to disable it
for FBA volumes too?

We will not re-enable DISCARD for ESE volumes, until you say it's good
again.

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https://bugs.launchpad.net/bugs/1862749

Title:
  [UBUNTU 20.04] Thin Provisioning support (disablement or final
  solution)

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