[Bug 1925094] [NEW] DISCARD support for Crypto Block Devices

[David Tomaschik]

Public bug reported:

It appears that running `fstrim` or similar is useless when the VM is on
a LUKS-encrypted device using QEMU's native LUKS support.

Looking at the source, it seems that block/crypto.c lacks an
implementation for bdrv_co_pdiscard, which probably needs to delegate to
a per-crypto type discard helper.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1925094

Title:
  DISCARD support for Crypto Block Devices

Status in QEMU:
  New

Bug description:
  It appears that running `fstrim` or similar is useless when the VM is
  on a LUKS-encrypted device using QEMU's native LUKS support.

  Looking at the source, it seems that block/crypto.c lacks an
  implementation for bdrv_co_pdiscard, which probably needs to delegate
  to a per-crypto type discard helper.

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