From cb6934f8ea1a595902ca37e250e0917d4dd7b2a7 Mon Sep 17 00:00:00 2001 From: Jens Axboe Date: Tue, 27 Jun 2017 09:22:02 -0600 Subject: block: add support for write hints in a bio No functional changes in this patch, we just use up some holes in the bio and request structures to define a write hint that we psas down the stack. Ensure that we don't merge requests that have different life time hints assigned to them, and that we inherit the write hint when cloning a bio. Reviewed-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Signed-off-by: Jens Axboe --- include/linux/blk_types.h | 1 + include/linux/blkdev.h | 2 ++ 2 files changed, 3 insertions(+) (limited to 'include') diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index e210da6d14b8..d2eb87c84d82 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -56,6 +56,7 @@ struct bio { */ unsigned short bi_flags; /* status, etc and bvec pool number */ unsigned short bi_ioprio; + unsigned short bi_write_hint; struct bvec_iter bi_iter; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index bf2157141d53..0eebd3bcfd85 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -225,6 +225,8 @@ struct request { unsigned int extra_len; /* length of alignment and padding */ + unsigned short write_hint; + unsigned long deadline; struct list_head timeout_list; -- cgit v1.2.3-70-g09d2