From 1d796d6a9641fbfcd90fcfaf6fb4894a13d0304f Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 1 Nov 2016 09:52:57 -0600 Subject: [PATCH] block: add REQ_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 Reviewed-by: Christoph Hellwig --- 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 bb92102..562ac46 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