From 3a5e02ced11e22ecd9da3d6710afe15bcfee1d10 Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Sun, 5 Jun 2016 14:32:23 -0500 Subject: block, drivers: add REQ_OP_FLUSH operation This adds a REQ_OP_FLUSH operation that is sent to request_fn based drivers by the block layer's flush code, instead of sending requests with the request->cmd_flags REQ_FLUSH bit set. Signed-off-by: Mike Christie Reviewed-by: Christoph Hellwig Reviewed-by: Hannes Reinecke Signed-off-by: Jens Axboe --- include/linux/blk_types.h | 3 ++- include/linux/blkdev.h | 3 +++ 2 files changed, 5 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 23c1ab2a9475..32d87522f349 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -249,9 +249,10 @@ enum req_op { REQ_OP_WRITE, REQ_OP_DISCARD, /* request to discard sectors */ REQ_OP_WRITE_SAME, /* write same block many times */ + REQ_OP_FLUSH, /* request for cache flush */ }; -#define REQ_OP_BITS 2 +#define REQ_OP_BITS 3 typedef unsigned int blk_qc_t; #define BLK_QC_T_NONE -1U diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 78ae3dbf2de1..0c9f8793c87e 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -666,6 +666,9 @@ static inline bool rq_mergeable(struct request *rq) if (rq->cmd_type != REQ_TYPE_FS) return false; + if (req_op(rq) == REQ_OP_FLUSH) + return false; + if (rq->cmd_flags & REQ_NOMERGE_FLAGS) return false; -- cgit v1.2.3-71-gd317