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    Subject[PATCH 1/8] block: add WRITE_BACKGROUND
    Date
    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>
    ---
    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
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