[Lustre-devel] Query to understand the Lustre request/reply message

[Alexey Lyashkov]

Hi Vilobh,

ldlm_cli_cancel_req is good example to use old PtlRPC API.
for first you need allocate request buffer via ptlrpc_prep_req
next is - allocate reply buffer via ptlrpc_req_set_repsize
next - call ptlrpc_queue_wait to send message and wait reply.

osc_getattr_async good example for new PtlRPC API and async RPC processing.

if that isn't help you - please show a yours code to find a error.

On Oct 12, 2010, at 20:55, Vilobh Meshram wrote:

> I want to understand the message encoding and decoding logic in lustre.I am planning to send a request to the MDS and based on the reply from MDs want to populate the 
> 
>    struct lustre_msg *rq_repbuf; /* client only, buf may be bigger than msg */
>    struct lustre_msg *rq_repmsg;
> 
> I am trying this for a simple "Hello" message but not seeing the expected output.Sometime I even see Kernel Crash.
> If you can please give me some insight on the way the Lustre File system encodes decodes the messages sent accross nodes it would be helpful.
> 
> Thanks,
> Vilobh
> Graduate Research Associate
> Department of Computer Science
> The Ohio State University Columbus Ohio
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> Lustre-devel at lists.lustre.org
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