RPC 2: OST_SETATTR
~~~~~~~~~~~~~~~~~~
[[ost-setattr-rpc]]

OST_SETATTR (pb_opc = 2) is an RPC that sets resource attributes.

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

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

       OST_SETATTR:
      --request-----------------
      | ptlrpc_body | ost_body |
      --------------------------
//////////////////////////////////////////////////////////////////////

include::struct_ptlrpc_body.txt[]

[NOTE]
The RPC descriptor just described is the first buffer in the
OST_SETATTR request message. It will also appear as the first buffer
of every other RPC request or reply sent between entities. Refer back
to the above discussion when examining other RPC messages. The next
section describes the 'struct ost_body' which is the second (and
final) buffer in an OST_SETATTR request message.

include::struct_ost_body.txt[]

The above discussion described the structure of the OST_SETATTR
request message. In this case the reply message structure looks much
the same. It uses the same to buffers, and only changes their contents
to reflect that the message is a reply rather than a request.

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

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

       OST_SETATTR:
      --reply-------------------
      | ptlrpc_body | ost_body |
      --------------------------
//////////////////////////////////////////////////////////////////////

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

'ost_body'::
Metadata about the resource. See <<struct-ost-body>>.