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| author | Jens Axboe <axboe@fb.com> | 2016-11-01 09:52:57 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-11-02 10:24:01 -0600 |
| commit | 1d796d6a9641fbfcd90fcfaf6fb4894a13d0304f (patch) | |
| tree | 936f37c21014cf3fc61490f85503bbd3f3836046 | |
| parent | 7281b4526cefc898d180850b54d1369f38c6b202 (diff) | |
| download | lwn-1d796d6a9641fbfcd90fcfaf6fb4894a13d0304f.tar.gz lwn-1d796d6a9641fbfcd90fcfaf6fb4894a13d0304f.zip | |
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.h | 2 |
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) |