Messages in this thread | | | Date | Tue, 9 Aug 2011 15:05:09 -0400 | From | Vivek Goyal <> | Subject | Re: block: properly handle flush/fua requests in blk_insert_cloned_request |
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On Tue, Aug 09, 2011 at 02:55:31PM -0400, Mike Snitzer wrote:
[..] > > > + /* > > > + * All FLUSH/FUA requests are expected to have gone through the > > > + * flush machinary. If a request's cmd_flags doesn't match the > > > + * flush_flags of the underlying request_queue it is a bug. > > > + */ > > > + BUG_ON((rq->cmd_flags & REQ_FLUSH) && !(q->flush_flags & REQ_FLUSH)); > > > + BUG_ON((rq->cmd_flags & REQ_FUA) && !(q->flush_flags & REQ_FUA)); > > > + > > > > Actually this makes sense and is simple. :-) Is BUG_ON() too harsh, how > > about WARN_ONCE() variants? To me system continues to work so warning > > is probably good enough. > > Sure, WARN_ONCE() is fine by me. > > Seems Tejun wants a more involved fix though.
Fixing it properly doesn't hurt. Makes it more future proof. In fact I am thinking what happens to blk_execute_rq() variants where one can prepare a request and send it down. What if caller sets FLUSH/FUA flags there.
Thanks Vivek
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