Commit 87caf97c authored by Hannes Reinecke's avatar Hannes Reinecke Committed by Jens Axboe
Browse files

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: default avatarHannes Reinecke <>

[Damien: Updated Documentation/ABI/testing/sysfs-block]
Signed-off-by: default avatarDamien Le Moal <>
Reviewed-by: default avatarChristoph Hellwig <>
Reviewed-by: default avatarMartin K. Petersen <>
Reviewed-by: default avatarShaun Tancheff <>
Tested-by: default avatarShaun Tancheff <>
Signed-off-by: default avatarJens Axboe <>
parent 797476b8
......@@ -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 <>
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.
......@@ -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[] = {
Supports Markdown
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment