From: Hannes Reinecke <hare@xxxxxxx>
The queue limits already have a 'chunk_sectors' setting, so
we should be presenting it via sysfs.
Signed-off-by: Hannes Reinecke <hare@xxxxxxx>
[Damien: Updated Documentation/ABI/testing/sysfs-block]
Signed-off-by: Damien Le Moal <damien.lemoal@xxxxxxxx>
---
Documentation/ABI/testing/sysfs-block | 13 +++++++++++++
block/blk-sysfs.c | 11 +++++++++++
2 files changed, 24 insertions(+)
diff --git a/Documentation/ABI/testing/sysfs-block b/Documentation/ABI/testing/sysfs-block
index 75a5055..ee2d5cd 100644
--- a/Documentation/ABI/testing/sysfs-block
+++ b/Documentation/ABI/testing/sysfs-block
@@ -251,3 +251,16 @@ Description:
since drive-managed zoned block devices do not support
zone commands, they will be treated as regular block
devices and zoned will report "none".
+
+What: /sys/block/<disk>/queue/chunk_sectors
+Date: September 2016
+Contact: Hannes Reinecke <hare@xxxxxxxx>
+Description:
+ chunk_sectors has different meaning depending on the type
+ of the disk. For a RAID device (dm-raid), chunk_sectors
+ indicates the size in 512B sectors of the RAID volume
+ stripe segment. For a zoned block device, either
+ host-aware or host-managed, chunk_sectors indicates the
+ size of 512B sectors of the zones of the device, with
+ the eventual exception of the last zone of the device
+ which may be smaller.
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index ff9cd9c..488c2e2 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,
--
2.7.4
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