REQ_BACKGROUND 482 block/blk-wbt.c else if ((rw & REQ_BACKGROUND) || close_io(rwb)) { REQ_BACKGROUND 403 drivers/md/bcache/request.c if ((bio->bi_opf & (REQ_RAHEAD|REQ_BACKGROUND))) { REQ_BACKGROUND 107 include/linux/writeback.h flags |= REQ_BACKGROUND;