| Message ID | 20210726013806.84815-5-damien.lemoal@wdc.com |
|---|---|
| State | New |
| Headers | show |
| Series | Initial support for multi-actuator HDDs | expand |
On 7/26/21 3:38 AM, Damien Le Moal wrote: > Update the file Documentation/block/queue-sysfs.rst to add a description > of a device queue sysfs entries related to concurrent sector ranges > (e.g. concurrent positioning ranges for multi-actuator hard-disks). > > While at it, also fix a typo in this file introduction paragraph. > > Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> > --- > Documentation/block/queue-sysfs.rst | 30 ++++++++++++++++++++++++++++- > 1 file changed, 29 insertions(+), 1 deletion(-) > Reviewed-by: Hannes Reinecke <hare@suse.de> Cheers, Hannes
On Mon, Jul 26, 2021 at 10:38:06AM +0900, Damien Le Moal wrote: > Update the file Documentation/block/queue-sysfs.rst to add a description > of a device queue sysfs entries related to concurrent sector ranges > (e.g. concurrent positioning ranges for multi-actuator hard-disks). > > While at it, also fix a typo in this file introduction paragraph. That should really be a separate patch. Otherwise looks good: Reviewed-by: Christoph Hellwig <hch@lst.de>
On 2021/08/10 17:28, Christoph Hellwig wrote: > On Mon, Jul 26, 2021 at 10:38:06AM +0900, Damien Le Moal wrote: >> Update the file Documentation/block/queue-sysfs.rst to add a description >> of a device queue sysfs entries related to concurrent sector ranges >> (e.g. concurrent positioning ranges for multi-actuator hard-disks). >> >> While at it, also fix a typo in this file introduction paragraph. > > That should really be a separate patch. OK. Will split that part out in a different patch (and cc stable maybe). > > Otherwise looks good: > > Reviewed-by: Christoph Hellwig <hch@lst.de> >
diff --git a/Documentation/block/queue-sysfs.rst b/Documentation/block/queue-sysfs.rst index 4dc7f0d499a8..25f4a768f450 100644 --- a/Documentation/block/queue-sysfs.rst +++ b/Documentation/block/queue-sysfs.rst @@ -4,7 +4,7 @@ Queue sysfs files This text file will detail the queue files that are located in the sysfs tree for each block device. Note that stacked devices typically do not export -any settings, since their queue merely functions are a remapping target. +any settings, since their queue merely functions as a remapping target. These files are the ones found in the /sys/block/xxx/queue/ directory. Files denoted with a RO postfix are readonly and the RW postfix means @@ -286,4 +286,32 @@ sequential zones of zoned block devices (devices with a zoned attributed that reports "host-managed" or "host-aware"). This value is always 0 for regular block devices. +cranges (RO) +------------ + +The presence of this sub-directory of the /sys/block/xxx/queue/ directory +indicates that the device is capable of executing requests targeting +different sector ranges in parallel. For instance, single LUN multi-actuator +hard-disks will likely have a cranges directory if the device correctly +advertizes the sector ranges of its actuators. + +The cranges directory contains one directory per concurrent range, with each +range described using the sector (RO) attribute file to indicate the first +sector of the range and the nr_sectors (RO) attribute file to indicate the +total number of sector in the range starting from the first sector. +For example, a dual-actuator hard disk will have the following cranges +entries.:: + + $ tree /sys/block/<device>/queue/cranges/ + /sys/block/<device>/queue/cranges/ + |-- 0 + | |-- nr_sectors + | `-- sector + `-- 1 + |-- nr_sectors + `-- sector + +The sector and nr_sectors attributes use 512B sector unit, regardless of +the actual block size of the device. + Jens Axboe <jens.axboe@oracle.com>, February 2009
Update the file Documentation/block/queue-sysfs.rst to add a description of a device queue sysfs entries related to concurrent sector ranges (e.g. concurrent positioning ranges for multi-actuator hard-disks). While at it, also fix a typo in this file introduction paragraph. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> --- Documentation/block/queue-sysfs.rst | 30 ++++++++++++++++++++++++++++- 1 file changed, 29 insertions(+), 1 deletion(-)