[dm-devel] [RFC PATCH V2 05/13] block: add req flag of REQ_TAG

[Ming Lei]

On Fri, Mar 19, 2021 at 01:38:13PM -0400, Mike Snitzer wrote:
> On Thu, Mar 18 2021 at 12:48pm -0400,
> Ming Lei <ming.lei at redhat.com> wrote:
> 
> > Add one req flag REQ_TAG which will be used in the following patch for
> > supporting bio based IO polling.
> 
> "REQ_TAG" is so generic yet is used in such a specific way (to mark an
> FS bio as having polling context)
> 
> I don't have a great suggestion for a better name, just seems "REQ_TAG"
> is lacking... (especially given the potential for confusion due to
> blk-mq's notion of "tag").
> 
> REQ_FS? REQ_FS_CTX? REQ_POLL? REQ_POLL_CTX? REQ_NAMING_IS_HARD :)
> 

Maybe REQ_POLL_CTX is better, it is just for marking bios:

1) which need to be polled in this context

2) which can be polled in this context

-- 
Ming