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authorJens Axboe <axboe@fb.com>2016-11-01 18:52:57 +0300
committerJens Axboe <axboe@fb.com>2016-11-02 19:24:01 +0300
commit1d796d6a9641fbfcd90fcfaf6fb4894a13d0304f (patch)
tree936f37c21014cf3fc61490f85503bbd3f3836046
parent7281b4526cefc898d180850b54d1369f38c6b202 (diff)
downloadlinux-1d796d6a9641fbfcd90fcfaf6fb4894a13d0304f.tar.xz
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 <axboe@fb.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
-rw-r--r--include/linux/blk_types.h2
1 files changed, 2 insertions, 0 deletions
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)