RPC 103: LDLM_CANCEL
~~~~~~~~~~~~~~~~~~~~
[[ldlm-cancel-rpc]]

An RPC that notifies an entity that a requested lock is no longer needed.

.LDLM_CANCEL Request Packet Structure
image::ldlm-cancel-request.png["LDLM_CANCEL Request Packet Structure",height=50]

//////////////////////////////////////////////////////////////////////
The ldlm-cancel-request.png diagram resembles this text
art:

       LDLM_CANCEL:
      --request---------------------
      | ptlrpc_body | ldlm_request |
      ------------------------------
//////////////////////////////////////////////////////////////////////

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

'ldlm_request'::
The request RPC identifies the lock being canceled. Only the first
'lock_handle' field is used. The rest of the 'ldlm_request' structure
is not used. <<struct-ldlm-request>>

.LDLM_CANCEL Reply Packet Structure
image::ldlm-cancel-reply.png["LDLM_CANCEL Reply Packet Structure",height=50]

//////////////////////////////////////////////////////////////////////
The ldlm-cancel-reply.png diagram resembles this text
art:

       LDLM_CANCEL:
      --reply--------
      | ptlrpc_body |
      ---------------
//////////////////////////////////////////////////////////////////////

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