[2/9] blk-sysfs: Add 'chunk_sectors' to sysfs attributes

Commit Message

Damien Le Moal Sept. 19, 2016, 9:27 p.m. UTC

From: Hannes Reinecke <[e-mail]>

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

Signed-off-by: Hannes Reinecke <[e-mail]>
Signed-off-by: Damien Le Moal <[e-mail]>
---
 block/blk-sysfs.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

Patch

diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 31ecff9..15e5baf 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -130,6 +130,11 @@  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_io_min_show(struct request_queue *q, char *page)
 {
 	return queue_var_show(queue_io_min(q), page);
@@ -455,6 +460,11 @@  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 },
+	.show = queue_chunk_sectors_show,
+};
+
 static struct queue_sysfs_entry queue_io_min_entry = {
 	.attr = {.name = "minimum_io_size", .mode = S_IRUGO },
 	.show = queue_io_min_show,
@@ -555,6 +565,7 @@  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,