linux-kernel - [PATCH v6 2/7] blk-sysfs: Add 'chunk

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Date:   Fri, 30 Sep 2016 14:12:31 -0500
From:   Shaun Tancheff <shaun@...cheff.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Hannes Reinecke <hare@...e.de>, linux-block@...r.kernel.org,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Christoph Hellwig <hch@....de>,
        "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
        Damien Le Moal <damien.lemoal@...t.com>,
        Michael T Lombardi <michael.t.lombardi@...gate.com>
Subject: [PATCH v6 2/7] blk-sysfs: Add 'chunk_sectors' to sysfs attributes

From: Hannes Reinecke <hare@...e.de>

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>

[Damien: Updated Documentation/ABI/testing/sysfs-block]

Signed-off-by: Damien Le Moal <damien.lemoal@...t.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Reviewed-by: Martin K. Petersen <martin.petersen@...cle.com>
Reviewed-by: Shaun Tancheff <shaun.tancheff@...gate.com>
Tested-by: Shaun Tancheff <shaun.tancheff@...gate.com>
---
 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@...e.com>
+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,
-- 
2.9.3