linux-kernel - [PATCH v3 1/7] block: extend stream count for in-kernel use

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Date:   Fri, 29 Mar 2019 13:23:46 +0530
From:   Kanchan Joshi <joshi.k@...sung.com>
To:     linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-nvme@...ts.infradead.org, linux-fsdevel@...r.kernel.org,
        linux-ext4@...r.kernel.org
Cc:     axboe@...com, prakash.v@...sung.com, anshul@...sung.com,
        joshiiitr@...il.com, Kanchan Joshi <joshi.k@...sung.com>
Subject: [PATCH v3 1/7] block: extend stream count for in-kernel use

This patch bumps up stream count to suppor in-kernel hints. It also
adds 'streamid' member in 'request' and declares new API for driver
to register stream-info with block layer.

Signed-off-by: Kanchan Joshi <joshi.k@...sung.com>
---
 include/linux/blkdev.h | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 338604d..4088e21 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -214,6 +214,7 @@ struct request {
 #endif
 
 	unsigned short write_hint;
+	unsigned short streamid;
 	unsigned short ioprio;
 
 	void *special;		/* opaque pointer available for LLD use */
@@ -341,6 +342,8 @@ struct queue_limits {
 	unsigned char		misaligned;
 	unsigned char		discard_misaligned;
 	unsigned char		raid_partial_stripes_expensive;
+
+	unsigned short		nr_streams;
 	enum blk_zoned_model	zoned;
 };
 
@@ -567,8 +570,9 @@ struct request_queue {
 	size_t			cmd_size;
 
 	struct work_struct	release_work;
-
-#define BLK_MAX_WRITE_HINTS	5
+#define BLK_MAX_USER_HINTS	(WRITE_LIFE_KERN_MIN - 2)
+#define BLK_MAX_KERN_HINTS	4
+#define BLK_MAX_WRITE_HINTS	(1 + BLK_MAX_USER_HINTS + BLK_MAX_KERN_HINTS)
 	u64			write_hints[BLK_MAX_WRITE_HINTS];
 };
 
@@ -1071,6 +1075,7 @@ 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_flush_queueable(struct request_queue *q, bool queueable);
 extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
+extern void blk_queue_stream_limits(struct request_queue *, unsigned short);
 
 /*
  * Number of physical segments as sent to the device.
-- 
2.7.4