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Date: Tue, 23 Jan 2018 10:13:09 +0100 (CET)
From: Julia Lawall <julia.lawall@...6.fr>
To: Aishwarya Pant <aishpant@...il.com>
cc: Thomas Maier <balagi@...tmail.de>,
Jonathan Corbet <corbet@....net>,
Greg KH <gregkh@...uxfoundation.org>,
linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: Re: [PATCH] Documentation/ABI: clean up sysfs-class-pktcdvd
On Tue, 23 Jan 2018, Aishwarya Pant wrote:
> Clean up the sysfs documentation such that it is in the same format as
> described in Documentation/ABI/README. Mainly, the patch moves the
> attribute names to the 'What:' field. This might be useful for scripting
> and tracking changes in the ABI.
>
> Signed-off-by: Aishwarya Pant <aishpant@...il.com>
> ---
> Documentation/ABI/testing/sysfs-class-pktcdvd | 122 +++++++++++++++-----------
> 1 file changed, 71 insertions(+), 51 deletions(-)
>
> diff --git a/Documentation/ABI/testing/sysfs-class-pktcdvd b/Documentation/ABI/testing/sysfs-class-pktcdvd
> index b1c3f0263359..e85ec99c6e31 100644
> --- a/Documentation/ABI/testing/sysfs-class-pktcdvd
> +++ b/Documentation/ABI/testing/sysfs-class-pktcdvd
> @@ -1,60 +1,80 @@
> -What: /sys/class/pktcdvd/
> +sysfs interface
> +---------------
> +The pktcdvd module (packet writing driver) creates the following files in the
> +sysfs: (<devid> is in format major:minor)
> +
> +What: /sys/class/pktcdvd/add
> +What: /sys/class/pktcdvd/remove
> +What: /sys/class/pktcdvd/device_map
> Date: Oct. 2006
> KernelVersion: 2.6.20
> Contact: Thomas Maier <balagi@...tmail.de>
> Description:
>
> -sysfs interface
> ----------------
> + add: (WO) Write a block device id (major:minor) to create
> + a new pktcdvd device and map it to the block device.
> +
> + remove: (WO) Write the pktcdvd device id (major:minor) to it to
> + remove the pktcdvd device.
> +
> + device_map: (RO) Shows the device mapping in format:
> + pktcdvd[0-7] <pktdevid> <blkdevid>
> +
> +
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/dev
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/uevent
It looks like there is a small alignment problem here. Maybe you use
spaces in one case and tabs in the other.
julia
> +Date: Oct. 2006
> +KernelVersion: 2.6.20
> +Contact: Thomas Maier <balagi@...tmail.de>
> +Description:
> + dev: (RO) Device id
> +
> + uevent: (WO) To send an uevent
> +
> +
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_started
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/packets_finished
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_written
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/kb_read_gather
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/stat/reset
> +Date: Oct. 2006
> +KernelVersion: 2.6.20
> +Contact: Thomas Maier <balagi@...tmail.de>
> +Description:
> + packets_started: (RO) Number of started packets.
> +
> + packets_finished: (RO) Number of finished packets.
> +
> + kb_written: (RO) kBytes written.
> +
> + kb_read: (RO) kBytes read.
> +
> + kb_read_gather: (RO) kBytes read to fill write packets.
> +
> + reset: (WO) Write any value to it to reset pktcdvd
> + device statistic values, like bytes
> + read/written.
> +
> +
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/size
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_off
> +What: /sys/class/pktcdvd/pktcdvd[0-7]/write_queue/congestion_on
> +Date: Oct. 2006
> +KernelVersion: 2.6.20
> +Contact: Thomas Maier <balagi@...tmail.de>
> +Description:
> + size: (RO) Contains the size of the bio write queue.
> +
> + congestion_off: (RW) If bio write queue size is below this mark,
> + accept new bio requests from the block layer.
>
> -The pktcdvd module (packet writing driver) creates
> -these files in the sysfs:
> -(<devid> is in format major:minor )
> -
> -/sys/class/pktcdvd/
> - add (0200) Write a block device id (major:minor)
> - to create a new pktcdvd device and map
> - it to the block device.
> -
> - remove (0200) Write the pktcdvd device id (major:minor)
> - to it to remove the pktcdvd device.
> -
> - device_map (0444) Shows the device mapping in format:
> - pktcdvd[0-7] <pktdevid> <blkdevid>
> -
> -/sys/class/pktcdvd/pktcdvd[0-7]/
> - dev (0444) Device id
> - uevent (0200) To send an uevent.
> -
> -/sys/class/pktcdvd/pktcdvd[0-7]/stat/
> - packets_started (0444) Number of started packets.
> - packets_finished (0444) Number of finished packets.
> -
> - kb_written (0444) kBytes written.
> - kb_read (0444) kBytes read.
> - kb_read_gather (0444) kBytes read to fill write packets.
> -
> - reset (0200) Write any value to it to reset
> - pktcdvd device statistic values, like
> - bytes read/written.
> -
> -/sys/class/pktcdvd/pktcdvd[0-7]/write_queue/
> - size (0444) Contains the size of the bio write
> - queue.
> -
> - congestion_off (0644) If bio write queue size is below
> - this mark, accept new bio requests
> - from the block layer.
> -
> - congestion_on (0644) If bio write queue size is higher
> - as this mark, do no longer accept
> - bio write requests from the block
> - layer and wait till the pktcdvd
> - device has processed enough bio's
> - so that bio write queue size is
> - below congestion off mark.
> - A value of <= 0 disables congestion
> - control.
> + congestion_on: (RW) If bio write queue size is higher as this
> + mark, do no longer accept bio write requests
> + from the block layer and wait till the pktcdvd
> + device has processed enough bio's so that bio
> + write queue size is below congestion off mark.
> + A value of <= 0 disables congestion control.
>
>
> Example:
> --
> 2.16.1
>
>
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