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Subject[PATCH v5 3/7] block: introduce API to register stream information with block-layer
Date
This introduces stream limit (count of streams supported by underlying
driver) in request-queue.

Signed-off-by: Kanchan Joshi <joshi.k@samsung.com>
---
block/blk-settings.c | 12 ++++++++++++
include/linux/blkdev.h | 2 ++
2 files changed, 14 insertions(+)

diff --git a/block/blk-settings.c b/block/blk-settings.c
index 6375afa..6023229 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -231,6 +231,18 @@ void blk_queue_max_discard_sectors(struct request_queue *q,
EXPORT_SYMBOL(blk_queue_max_discard_sectors);

/**
+ * blk_queue_stream_limits - set stream parameters
+ * @q: the request queue for the device
+ * @nr_streams: number of streams supported by device
+ **/
+void blk_queue_stream_limits(struct request_queue *q,
+ unsigned short nr_streams)
+{
+ q->limits.nr_streams = nr_streams;
+}
+EXPORT_SYMBOL(blk_queue_stream_limits);
+
+/**
* blk_queue_max_write_same_sectors - set max sectors for a single write same
* @q: the request queue for the device
* @max_write_same_sectors: maximum number of sectors to write per command
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 2826225..5b6cb9747 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -340,6 +340,7 @@ struct queue_limits {
unsigned char discard_misaligned;
unsigned char raid_partial_stripes_expensive;
enum blk_zoned_model zoned;
+ unsigned short nr_streams;
};

#ifdef CONFIG_BLK_DEV_ZONED
@@ -1064,6 +1065,7 @@ extern void blk_queue_dma_alignment(struct request_queue *, int);
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
+extern void blk_queue_stream_limits(struct request_queue *q, unsigned short);

/*
* Number of physical segments as sent to the device.
--
2.7.4
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