Re: [PATCH 1/6] block: add support for REQ_OP_VERIFY

Christoph Hellwig
2022-07-05T08:34:24Z

On Thu, Jun 30, 2022 at 02:14:01AM -0700, Chaitanya Kulkarni wrote:
> This adds a new block layer operation to offload verifying a range of
> LBAs. This support is needed in order to provide file systems and
> fabrics, kernel components to offload LBA verification when it is
> supported by the hardware controller. In case hardware offloading is
> not supported then we provide API to emulate the same. The prominent
> example of that is SCSI and NVMe Verify command. We also provide
> an emulation of the same operation that can be used in case H/W does
> not support verify. This is still useful when block device is remotely
> attached e.g. using NVMeOF.

What is the point of providing the offload?