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block: Definition for barrier requests flag

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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 <draviv@codeaurora.org>
[imaund@codeaurora.org: Resolved context conflicts]
Signed-off-by: Ian Maund <imaund@codeaurora.org>
[xiaonian@codeaurora.org: fixed trivial merge conflicts]
Signed-off-by: Xiaonian Wang <xiaonian@codeaurora.org>
This commit is contained in:
Dolev Raviv 2015-05-26 15:55:21 -07:00 • committed by Xiaonian Wang
commit bd8c8fd052
1 changed files with 3 additions and 1 deletions
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4
include/linux/blk_types.h
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@ -162,6 +162,7 @@ enum rq_flag_bits {
__REQ_INTEGRITY, /* I/O includes block integrity payload */
__REQ_FUA, /* forced unit access */
__REQ_PREFLUSH, /* request for cache flush */
__REQ_BARRIER, /* marks flush req as barrier */
/* bio only flags */
__REQ_RAHEAD, /* read ahead, can fail anytime */
@ -207,7 +208,7 @@ enum rq_flag_bits {
(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
#define REQ_COMMON_MASK \
(REQ_FAILFAST_MASK | REQ_SYNC | REQ_META | REQ_PRIO | REQ_NOIDLE | \
REQ_PREFLUSH | REQ_FUA | REQ_INTEGRITY | REQ_NOMERGE)
REQ_PREFLUSH | REQ_FUA | REQ_INTEGRITY | REQ_NOMERGE | REQ_BARRIER)
#define REQ_CLONE_MASK REQ_COMMON_MASK
/* This mask is used for both bio and request merge checking */
@ -220,6 +221,7 @@ 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)