From 7472ef2e312ebc37de6a3194868773ed0f4dae8a Mon Sep 17 00:00:00 2001 From: Dolev Raviv Date: Tue, 26 May 2015 15:55:21 -0700 Subject: block: Definition for barrier requests flag A barrier request is a type of flush request used to control ordering of write requests without clearing the device's cache. LLD support for barrier is optional. To maintain backward compatibility, barrier request has to maintain flush s/w path and flags. This patch introduces those flags to define interface between the block layer and the LLD. Change-Id: Iefa8e9a5c1b5e8256eaeb0322c435becd4669de9 Signed-off-by: Dolev Raviv [imaund@codeaurora.org: Resolved context conflicts] Signed-off-by: Ian Maund --- include/linux/blk_types.h | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 97de24865cd6..6509574f9b95 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -161,6 +161,7 @@ enum rq_flag_bits { __REQ_INTEGRITY, /* I/O includes block integrity payload */ __REQ_FUA, /* forced unit access */ __REQ_FLUSH, /* request for cache flush */ + __REQ_BARRIER, /* marks flush req as barrier */ /* bio only flags */ __REQ_RAHEAD, /* read ahead, can fail anytime */ @@ -211,7 +212,7 @@ enum rq_flag_bits { #define REQ_COMMON_MASK \ (REQ_WRITE | REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | \ REQ_DISCARD | REQ_WRITE_SAME | REQ_NOIDLE | REQ_FLUSH | REQ_FUA | \ - REQ_SECURE | REQ_INTEGRITY) + REQ_SECURE | REQ_INTEGRITY | REQ_BARRIER) #define REQ_CLONE_MASK REQ_COMMON_MASK #define BIO_NO_ADVANCE_ITER_MASK (REQ_DISCARD|REQ_WRITE_SAME) @@ -226,6 +227,7 @@ enum rq_flag_bits { #define REQ_SORTED (1ULL << __REQ_SORTED) #define REQ_SOFTBARRIER (1ULL << __REQ_SOFTBARRIER) #define REQ_FUA (1ULL << __REQ_FUA) +#define REQ_BARRIER (1ULL << __REQ_BARRIER) #define REQ_NOMERGE (1ULL << __REQ_NOMERGE) #define REQ_STARTED (1ULL << __REQ_STARTED) #define REQ_DONTPREP (1ULL << __REQ_DONTPREP) -- cgit v1.2.3