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From: Ming Lei <tom.leiming@gmail.com>
To: Jens Axboe <axboe@fb.com>, linux-kernel@vger.kernel.org
Cc: linux-block@vger.kernel.org,
	Christoph Hellwig <hch@infradead.org>,
	Ming Lei <tom.leiming@gmail.com>, Hannes Reinecke <hare@suse.de>,
	Mike Christie <mchristi@redhat.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Toshi Kani <toshi.kani@hpe.com>,
	Damien Le Moal <damien.lemoal@hgst.com>
Subject: [PATCH v1 10/54] block: introduce flag QUEUE_FLAG_NO_MP
Date: Tue, 27 Dec 2016 23:55:59 +0800	[thread overview]
Message-ID: <1482854250-13481-11-git-send-email-tom.leiming@gmail.com> (raw)
In-Reply-To: <1482854250-13481-1-git-send-email-tom.leiming@gmail.com>

MD(especially raid1 and raid10) is a bit difficult to support
multipage bvec, so introduce this flag for not enabling multipage
bvec, then MD can still accept singlepage bvec only, and once
direct access to bvec table in MD are cleanuped, the flag can be
removed.

Signed-off-by: Ming Lei <tom.leiming@gmail.com>
---
 include/linux/blkdev.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 83695641bd5e..0c02d9778965 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -600,6 +600,7 @@ struct request_queue {
 #define QUEUE_FLAG_FLUSH_NQ    25	/* flush not queueuable */
 #define QUEUE_FLAG_DAX         26	/* device supports DAX */
 #define QUEUE_FLAG_STATS       27	/* track rq completion times */
+#define QUEUE_FLAG_NO_MP       28	/* multipage bvecs isn't ready */
 
 #define QUEUE_FLAG_DEFAULT	((1 << QUEUE_FLAG_IO_STAT) |		\
 				 (1 << QUEUE_FLAG_STACKABLE)	|	\
@@ -690,6 +691,7 @@ static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
 #define blk_queue_secure_erase(q) \
 	(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
 #define blk_queue_dax(q)	test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
+#define blk_queue_no_mp(q)	test_bit(QUEUE_FLAG_NO_MP, &(q)->queue_flags)
 
 #define blk_noretry_request(rq) \
 	((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
-- 
2.7.4

  parent reply	other threads:[~2016-12-27 16:00 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1482854250-13481-1-git-send-email-tom.leiming@gmail.com>
2016-12-27 15:55 ` [PATCH v1 01/54] block: drbd: comment on direct access bvec table Ming Lei
2016-12-27 15:55 ` [PATCH v1 02/54] block: loop: comment on direct access to " Ming Lei
2016-12-27 15:55 ` [PATCH v1 03/54] kernel/power/swap.c: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 04/54] mm: page_io.c: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 05/54] fs/buffer: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 06/54] f2fs: f2fs_read_end_io: " Ming Lei
2016-12-27 15:55 ` [PATCH v1 07/54] bcache: " Ming Lei
2016-12-30 16:56   ` Coly Li
2016-12-27 15:55 ` [PATCH v1 08/54] block: comment on bio_alloc_pages() Ming Lei
2016-12-30 10:40   ` Coly Li
2016-12-30 11:06   ` Coly Li
2016-12-27 15:55 ` [PATCH v1 09/54] block: comment on bio_iov_iter_get_pages() Ming Lei
2016-12-27 15:55 ` Ming Lei [this message]
2016-12-27 15:56 ` [PATCH v1 11/54] md: set NO_MP for request queue of md Ming Lei
2016-12-27 15:56 ` [PATCH v1 12/54] dm: limit the max bio size as BIO_MAX_PAGES * PAGE_SIZE Ming Lei
2017-01-03 16:43   ` Mike Snitzer
2017-01-06  3:30     ` Ming Lei
2016-12-27 15:56 ` [PATCH v1 13/54] block: comments on bio_for_each_segment[_all] Ming Lei
2016-12-27 15:56 ` [PATCH v1 14/54] block: introduce multipage/single page bvec helpers Ming Lei
2016-12-27 15:56 ` [PATCH v1 15/54] block: implement sp version of bvec iterator helpers Ming Lei
2016-12-27 15:56 ` [PATCH v1 16/54] block: introduce bio_for_each_segment_mp() Ming Lei
2016-12-27 15:56 ` [PATCH v1 17/54] block: introduce bio_clone_sp() Ming Lei
2016-12-27 15:56 ` [PATCH v1 18/54] bvec_iter: introduce BVEC_ITER_ALL_INIT Ming Lei
2016-12-27 15:56 ` [PATCH v1 19/54] block: bounce: avoid direct access to bvec table Ming Lei
2016-12-27 15:56 ` [PATCH v1 20/54] block: bounce: don't access bio->bi_io_vec in copy_to_high_bio_irq Ming Lei
2016-12-27 15:56 ` [PATCH v1 21/54] block: introduce bio_can_convert_to_sp() Ming Lei
2016-12-27 15:56 ` [PATCH v1 22/54] block: bounce: convert multipage bvecs into singlepage Ming Lei
2016-12-27 15:56 ` [PATCH v1 23/54] bcache: handle bio_clone() & bvec updating for multipage bvecs Ming Lei
2016-12-30 11:01   ` Coly Li
2016-12-31 10:29     ` Ming Lei
2016-12-27 15:56 ` [PATCH v1 24/54] blk-merge: compute bio->bi_seg_front_size efficiently Ming Lei
2016-12-27 15:56 ` [PATCH v1 25/54] block: blk-merge: try to make front segments in full size Ming Lei
2016-12-27 15:56 ` [PATCH v1 26/54] block: blk-merge: remove unnecessary check Ming Lei
2016-12-27 15:56 ` [PATCH v1 27/54] block: use bio_for_each_segment_mp() to compute segments count Ming Lei
2016-12-27 15:56 ` [PATCH v1 28/54] block: use bio_for_each_segment_mp() to map sg Ming Lei
2016-12-27 15:56 ` [PATCH v1 29/54] block: introduce bvec_for_each_sp_bvec() Ming Lei
2016-12-27 15:56 ` [PATCH v1 30/54] block: bio: introduce single/multi page version of bio_for_each_segment_all() Ming Lei
2016-12-27 15:56 ` [PATCH v1 31/54] block: introduce bio_segments_all() Ming Lei
2017-01-16  3:19 ` [PATCH v1 00/54] block: support multipage bvec Ming Lei
2017-01-16 15:18   ` Christoph Hellwig
2017-01-17  2:40     ` Ming Lei
2017-01-17  7:50       ` Christoph Hellwig
2017-01-17  8:13         ` Ming Lei

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