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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@suse.de> [Damien: Updated Documentation/ABI/testing/sysfs-block] Signed-off-by: Damien Le Moal <damien.lemoal@hgst.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Shaun Tancheff <shaun.tancheff@seagate.com> Tested-by: Shaun Tancheff <shaun.tancheff@seagate.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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@ -251,3 +251,16 @@ Description:
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since drive-managed zoned block devices do not support
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zone commands, they will be treated as regular block
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devices and zoned will report "none".
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What: /sys/block/<disk>/queue/chunk_sectors
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Date: September 2016
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Contact: Hannes Reinecke <hare@suse.com>
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Description:
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chunk_sectors has different meaning depending on the type
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of the disk. For a RAID device (dm-raid), chunk_sectors
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indicates the size in 512B sectors of the RAID volume
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stripe segment. For a zoned block device, either
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host-aware or host-managed, chunk_sectors indicates the
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size of 512B sectors of the zones of the device, with
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the eventual exception of the last zone of the device
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which may be smaller.
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@ -130,6 +130,11 @@ static ssize_t queue_physical_block_size_show(struct request_queue *q, char *pag
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return queue_var_show(queue_physical_block_size(q), page);
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}
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static ssize_t queue_chunk_sectors_show(struct request_queue *q, char *page)
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{
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return queue_var_show(q->limits.chunk_sectors, page);
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}
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static ssize_t queue_io_min_show(struct request_queue *q, char *page)
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{
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return queue_var_show(queue_io_min(q), page);
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@ -455,6 +460,11 @@ static struct queue_sysfs_entry queue_physical_block_size_entry = {
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.show = queue_physical_block_size_show,
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};
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static struct queue_sysfs_entry queue_chunk_sectors_entry = {
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.attr = {.name = "chunk_sectors", .mode = S_IRUGO },
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.show = queue_chunk_sectors_show,
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};
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static struct queue_sysfs_entry queue_io_min_entry = {
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.attr = {.name = "minimum_io_size", .mode = S_IRUGO },
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.show = queue_io_min_show,
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@ -555,6 +565,7 @@ static struct attribute *default_attrs[] = {
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&queue_hw_sector_size_entry.attr,
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&queue_logical_block_size_entry.attr,
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&queue_physical_block_size_entry.attr,
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&queue_chunk_sectors_entry.attr,
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&queue_io_min_entry.attr,
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&queue_io_opt_entry.attr,
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&queue_discard_granularity_entry.attr,
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