[RFC PATCH 0/8] block: add support for REQ_OP_VERIFY

[Keith Busch]

On Thu, Nov 04, 2021 at 06:34:31PM +0100, Christoph Hellwig wrote:
> On Thu, Nov 04, 2021 at 10:32:35AM -0700, Darrick J. Wong wrote:
> > I also wonder if it would be useful (since we're already having a
> > discussion elsewhere about data integrity syscalls for pmem) to be able
> > to call this sort of thing against files?  In which case we'd want
> > another preadv2 flag or something, and then plumb all that through the
> > vfs/iomap as needed?
> 
> IFF we do this (can't answer if there is a need) we should not
> overload read with it.  It is an operation that does not return
> data but just a status, so let's not get into that mess.

If there is a need for this, a new io_uring opcode seems like the
appropirate user facing interface for it.