linux-kernel - [PATCH 1/8] block: add WRITE

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Date:   Tue, 1 Nov 2016 15:08:44 -0600
From:   Jens Axboe <axboe@...com>
To:     <axboe@...nel.dk>, <linux-kernel@...r.kernel.org>,
        <linux-fsdevel@...r.kernel.org>, <linux-block@...r.kernel.org>
CC:     <jack@...e.cz>, <hch@....de>, Jens Axboe <axboe@...com>
Subject: [PATCH 1/8] block: add WRITE_BACKGROUND

This adds a new request flag, REQ_BACKGROUND, that callers can use to
tell the block layer that this is background (non-urgent) IO.

Signed-off-by: Jens Axboe <axboe@...com>
---
 include/linux/blk_types.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h
index bb921028e7c5..562ac46cb790 100644
--- a/include/linux/blk_types.h
+++ b/include/linux/blk_types.h
@@ -177,6 +177,7 @@ enum req_flag_bits {
 	__REQ_FUA,		/* forced unit access */
 	__REQ_PREFLUSH,		/* request for cache flush */
 	__REQ_RAHEAD,		/* read ahead, can fail anytime */
+	__REQ_BACKGROUND,	/* background IO */
 	__REQ_NR_BITS,		/* stops here */
 };
 
@@ -192,6 +193,7 @@ enum req_flag_bits {
 #define REQ_FUA			(1ULL << __REQ_FUA)
 #define REQ_PREFLUSH		(1ULL << __REQ_PREFLUSH)
 #define REQ_RAHEAD		(1ULL << __REQ_RAHEAD)
+#define REQ_BACKGROUND		(1ULL << __REQ_BACKGROUND)
 
 #define REQ_FAILFAST_MASK \
 	(REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | REQ_FAILFAST_DRIVER)
-- 
2.7.4