Re: [RFC PATCH v2 1/7] block: Extand commit_rqs() to do batch processing

[Sagi Grimberg]

diff --git a/include/linux/blk-mq.h b/include/linux/blk-mq.h
index f389d7c724bd..6a20f8e8eb85 100644
--- a/include/linux/blk-mq.h
+++ b/include/linux/blk-mq.h
@@ -391,6 +391,7 @@ struct blk_mq_ops {
  enum {
        BLK_MQ_F_SHOULD_MERGE   = 1 << 0,
        BLK_MQ_F_TAG_SHARED     = 1 << 1,
+       BLK_MQ_F_FORCE_COMMIT_RQS = 1 << 3,

Maybe BLK_MQ_F_ALWAYS_COMMIT might be a better name?  Also this
flag (just like the existing ones..) could really use a comment
explaining it.

Would it make sense to elevate this flag to a request_queue flag
(QUEUE_FLAG_ALWAYS_COMMIT)?

I'm thinking of a possibility that an I/O scheduler may be used
to activate this functionality rather than having the driver set
it necessarily...