[PATCH] nvme: honor NVME_QUIRK_DEALLOCATE_ZEROES for unmap Write Zeroes

[Christoph Hellwig]

On Thu, Mar 05, 2026 at 12:27:32PM -0800, Robert Pang wrote:
> However, certain devices already use the NVME_QUIRK_DEALLOCATE_ZEROES quirk to
> indicate that they deterministically return zeroes after a deallocate/discard

Those certain devices are completely obsolete first generation Intel
SSDs.

> Update nvme_update_disk_info() to allow the presence of the DEALLOCATE_ZEROES
> quirk (combined with DSM support) to set max_hw_wzeroes_unmap_sectors to enable

No. This was a hack that got sneaked in in the first days of the nvme
driver and never should have been there.  It most certainly should not
be extended to any new functionality.