linux-kernel - [PATCH v6 5/6] block: Add blk_queue_max_allocate

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Date:   Mon, 10 Feb 2020 12:33:58 +0300
From:   Kirill Tkhai <ktkhai@...tuozzo.com>
To:     martin.petersen@...cle.com, bob.liu@...cle.com, axboe@...nel.dk
Cc:     agk@...hat.com, snitzer@...hat.com, dm-devel@...hat.com,
        song@...nel.org, tytso@....edu, adilger.kernel@...ger.ca,
        Chaitanya.Kulkarni@....com, darrick.wong@...cle.com,
        ming.lei@...hat.com, osandov@...com, jthumshirn@...e.de,
        minwoo.im.dev@...il.com, damien.lemoal@....com,
        andrea.parri@...rulasolutions.com, hare@...e.com, tj@...nel.org,
        ajay.joshi@....com, sagi@...mberg.me, dsterba@...e.com,
        chaitanya.kulkarni@....com, bvanassche@....org,
        dhowells@...hat.com, asml.silence@...il.com,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        ktkhai@...tuozzo.com
Subject: [PATCH v6 5/6] block: Add blk_queue_max_allocate_sectors()

This is a new helper to assign max_allocate_sectors
limit of block device queue.

Signed-off-by: Kirill Tkhai <ktkhai@...tuozzo.com>
Reviewed-by: Bob Liu <bob.liu@...cle.com>
---
 block/blk-settings.c   |   13 +++++++++++++
 include/linux/blkdev.h |    2 ++
 2 files changed, 15 insertions(+)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 8d5df9d37239..24cf8fbbd125 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -259,6 +259,19 @@ void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
 }
 EXPORT_SYMBOL(blk_queue_max_write_zeroes_sectors);
 
+/**
+ * blk_queue_max_allocate_sectors - set max sectors for a single
+ *                                  allocate request
+ * @q:  the request queue for the device
+ * @max_allocate_sectors: maximum number of sectors to write per command
+ **/
+void blk_queue_max_allocate_sectors(struct request_queue *q,
+		unsigned int max_allocate_sectors)
+{
+	q->limits.max_allocate_sectors = max_allocate_sectors;
+}
+EXPORT_SYMBOL(blk_queue_max_allocate_sectors);
+
 /**
  * blk_queue_max_segments - set max hw segments for a request for this queue
  * @q:  the request queue for the device
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 40707f980a2e..f5edbfea7b84 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1088,6 +1088,8 @@ extern void blk_queue_max_write_same_sectors(struct request_queue *q,
 		unsigned int max_write_same_sectors);
 extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
 		unsigned int max_write_same_sectors);
+extern void blk_queue_max_allocate_sectors(struct request_queue *q,
+		unsigned int max_allocate_sectors);
 extern void blk_queue_logical_block_size(struct request_queue *, unsigned int);
 extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
 extern void blk_queue_alignment_offset(struct request_queue *q,