linux-kernel - [PATCH 1/2] blktrace: treat flush as barrier

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Date:	Fri, 27 May 2011 22:11:22 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Jens Axboe <jaxboe@...ionio.com>
Cc:	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>
Subject: [PATCH 1/2] blktrace: treat flush as barrier

Since BARRIER requests have been converted to FLUSH/FUA, it would be
better for blktrace to recognize FLUSH requests as BARRIER for the
backward-compatibility IMHO.

Signed-off-by: Namhyung Kim <namhyung@...il.com>
Cc: Tejun Heo <tj@...nel.org>
---
 kernel/trace/blktrace.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/kernel/trace/blktrace.c b/kernel/trace/blktrace.c
index 6957aa298dfa..8635d332c50b 100644
--- a/kernel/trace/blktrace.c
+++ b/kernel/trace/blktrace.c
@@ -176,6 +176,7 @@ static const u32 ddir_act[2] = { BLK_TC_ACT(BLK_TC_READ),
 				 BLK_TC_ACT(BLK_TC_WRITE) };
 
 #define BLK_TC_RAHEAD		BLK_TC_AHEAD
+#define BLK_TC_FLUSH		BLK_TC_BARRIER
 
 /* The ilog2() calls fall out because they're constant */
 #define MASK_TC_BIT(rw, __name) ((rw & REQ_ ## __name) << \
@@ -206,6 +207,7 @@ static void __blk_add_trace(struct blk_trace *bt, sector_t sector, int bytes,
 	what |= MASK_TC_BIT(rw, RAHEAD);
 	what |= MASK_TC_BIT(rw, META);
 	what |= MASK_TC_BIT(rw, DISCARD);
+	what |= MASK_TC_BIT(rw, FLUSH);
 
 	pid = tsk->pid;
 	if (act_log_check(bt, what, sector, pid))
-- 
1.7.5.2

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