On 7/5/22 01:35, Christoph Hellwig wrote:

On Thu, Jun 30, 2022 at 02:14:04AM -0700, Chaitanya Kulkarni wrote:

quoted

Not all devices can support verify requests which can be mapped to
the controller specific command. This patch adds a way to emulate
REQ_OP_VERIFY for NVMeOF block device namespace. We add a new
workqueue to offload the emulation.

How is this an "emulation"?

since verify command for NVMe does everything that read does except
transferring the data, so if controller does not support verify
this implementation drops down to issuing the read command ..

Also why do we need the workqueue offloads?  I can't see any good
reason to not just simply submit the bio asynchronously like all the
other bios submitted by the block device backend.

okay will remove the workqueue ...

-ck