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Subject: [PATCH v5 5/6] block: Add blk_queue_max_allocate_sectors()
From:   Kirill Tkhai <ktkhai@virtuozzo.com>
To:     linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
        martin.petersen@oracle.com, bob.liu@oracle.com, axboe@kernel.dk,
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        Chaitanya.Kulkarni@wdc.com, darrick.wong@oracle.com,
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        ajay.joshi@wdc.com, sagi@grimberg.me, dsterba@suse.com,
        chaitanya.kulkarni@wdc.com, bvanassche@acm.org,
        dhowells@redhat.com, asml.silence@gmail.com, ktkhai@virtuozzo.com
Date:   Wed, 22 Jan 2020 13:58:19 +0300
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Precedence: bulk

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

Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.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 20c94a7f9411..249dce6dd436 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1089,6 +1089,8 @@ 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,