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Commit c267e6e0 authored by David Vrabel's avatar David Vrabel Committed by Konrad Rzeszutek Wilk
Browse files

xen: document backend sysfs files 



Add ABI documentation for the /sys/bus/xen-backend sysfs files,
including those specific to blkback devices.

Signed-off-by: default avatarDavid Vrabel <david.vrabel@citrix.com>
Signed-off-by: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent e0438b91

Documentation/ABI/stable/sysfs-bus-xen-backend

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What:		/sys/bus/xen-backend/devices/*/devtype

Date:		Feb 2009

KernelVersion:	2.6.38

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                The type of the device.  e.g., one of: 'vbd' (block),

                'vif' (network), or 'vfb' (framebuffer).



What:		/sys/bus/xen-backend/devices/*/nodename

Date:		Feb 2009

KernelVersion:	2.6.38

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                XenStore node (under /local/domain/NNN/) for this

                backend device.



What:		/sys/bus/xen-backend/devices/vbd-*/physical_device

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                The major:minor number (in hexidecimal) of the

                physical device providing the storage for this backend

                block device.



What:		/sys/bus/xen-backend/devices/vbd-*/mode

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                Whether the block device is read-only ('r') or

                read-write ('w').



What:		/sys/bus/xen-backend/devices/vbd-*/statistics/f_req

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                Number of flush requests from the frontend.



What:		/sys/bus/xen-backend/devices/vbd-*/statistics/oo_req

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                Number of requests delayed because the backend was too

                busy processing previous requests.



What:		/sys/bus/xen-backend/devices/vbd-*/statistics/rd_req

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                Number of read requests from the frontend.



What:		/sys/bus/xen-backend/devices/vbd-*/statistics/rd_sect

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                Number of sectors read by the frontend.



What:		/sys/bus/xen-backend/devices/vbd-*/statistics/wr_req

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                Number of write requests from the frontend.



What:		/sys/bus/xen-backend/devices/vbd-*/statistics/wr_sect

Date:		April 2011

KernelVersion:	3.0

Contact:	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

Description:

                Number of sectors written by the frontend.