linux-kernel - [PATCH 1/8] blk-sysfs: Add 'chunk

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Date:	Fri, 31 Jul 2015 15:36:13 +0200
From:	Hannes Reinecke <hare@...e.de>
To:	James Bottomley <james.bottomley@...senpartnership.com>
Cc:	Christoph Hellwig <hch@....de>, linux-scsi@...r.kernel.org,
	Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
	Hannes Reinecke <hare@...e.de>
Subject: [PATCH 1/8] blk-sysfs: Add 'chunk_sectors' to sysfs attributes

The queue limits already have a 'chunk_sectors' setting, so
we should be presenting it via sysfs.

Signed-off-by: Hannes Reinecke <hare@...e.de>
---
 block/blk-sysfs.c | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 6264b38..e419f1f 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -130,6 +130,26 @@ static ssize_t queue_physical_block_size_show(struct request_queue *q, char *pag
 	return queue_var_show(queue_physical_block_size(q), page);
 }
 
+static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
+{
+	return queue_var_show(q->limits.chunk_sectors, page);
+}
+
+static ssize_t
+queue_chunk_sectors_store(struct request_queue *q, const char *page, size_t count)
+{
+	unsigned long chunk_sectors;
+
+	ssize_t ret = queue_var_store(&chunk_sectors, page, count);
+	if (ret < 0)
+		return ret;
+	spin_lock_irq(q->queue_lock);
+	blk_queue_chunk_sectors(q, chunk_sectors);
+	spin_unlock_irq(q->queue_lock);
+
+	return ret;
+}
+
 static ssize_t queue_io_min_show(struct request_queue *q, char *page)
 {
 	return queue_var_show(queue_io_min(q), page);
@@ -345,6 +365,12 @@ static struct queue_sysfs_entry queue_physical_block_size_entry = {
 	.show = queue_physical_block_size_show,
 };
 
+static struct queue_sysfs_entry queue_chunk_sectors_entry = {
+	.attr = {.name = "chunk_sectors", .mode = S_IRUGO | S_IWUSR },
+	.show = queue_chunk_sectors_show,
+	.store = queue_chunk_sectors_store,
+};
+
 static struct queue_sysfs_entry queue_io_min_entry = {
 	.attr = {.name = "minimum_io_size", .mode = S_IRUGO },
 	.show = queue_io_min_show,
@@ -417,6 +443,7 @@ static struct attribute *default_attrs[] = {
 	&queue_hw_sector_size_entry.attr,
 	&queue_logical_block_size_entry.attr,
 	&queue_physical_block_size_entry.attr,
+	&queue_chunk_sectors_entry.attr,
 	&queue_io_min_entry.attr,
 	&queue_io_opt_entry.attr,
 	&queue_discard_granularity_entry.attr,
-- 
1.8.5.2

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