RPC 13: OST_STATFS
~~~~~~~~~~~~~~~~~~
[[ost-statfs-rpc]]

OST_STATFS is an RPC that queries data about the underlying file
system for a given OST.

The OST_STATFS request message is a so-called "empty" message in that
it only has a buffer for the 'ptlrpc_body' with the 'pb_opc' value
OST_STATFS (13).

The reply message conveys 'statfs' data when it succeeds, and an error
code if it doesn't.

.OST_STATFS Request Packet Structure
image::ost-statfs-request.png["OST_STATFS Request Packet Structure",height=50]

//////////////////////////////////////////////////////////////////////
The ost-statfs-request.png diagram resembles this text art:

       OST_STATFS:
      --request------
      | ptlrpc_body |
      ---------------
//////////////////////////////////////////////////////////////////////

'ptlrpc_body'::
RPC descriptor. See <<struct-ptlrpc-body>>.

.OST_STATFS Reply Packet Structure
image::ost-statfs-reply.png["OST_STATFS Reply Packet Structure",height=50]

//////////////////////////////////////////////////////////////////////
The ost-statfs-reply.png diagram resembles this text art:

       OST_STATFS:
      --reply---------------------
      | ptlrpc_body | obd_statfs |
      ----------------------------
//////////////////////////////////////////////////////////////////////

'ptlrpc_body'::
RPC descriptor. See <<struct-ptlrpc-body>>.

include::struct_obd_statfs.txt[]