linux-kernel - [PATCH 19/32] block: add helper to get data dir from op

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Date:	Wed,  4 Nov 2015 16:08:16 -0600
From:	mchristi@...hat.com
To:	linux-fsdevel@...r.kernel.org, dm-devel@...hat.com,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-scsi@...r.kernel.org, drbd-dev@...ts.linbit.com
Cc:	Mike Christie <mchristi@...hat.com>
Subject: [PATCH 19/32] block: add helper to get data dir from op

From: Mike Christie <mchristi@...hat.com>

In later patches the op will no longer be a bitmap, so we will
not have REQ_WRITE set for all non reads like discard, flush,
and write same. Drivers will still want to treat them as writes
for accounting reasons, so this patch adds a helper to translate
a op to a data direction.

Signed-off-by: Mike Christie <mchristi@...hat.com>
---
 include/linux/blkdev.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 19c2e94..cf5f518 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -586,6 +586,18 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
 
 #define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)
 
+/*
+ * Non REQ_OP_WRITE requests like discard, write same, etc, are
+ * considered WRITEs.
+ */
+static inline int op_to_data_dir(int op)
+{
+	if (op == REQ_OP_READ)
+		return READ;
+	else
+		return WRITE;
+}
+
 #define rq_data_dir(rq)		((int)((rq)->cmd_flags & 1))
 
 /*
-- 
1.8.3.1

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