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recovery: support for CLAIM_DELEGATE_PREV, DELEGPURGE

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10.2.1. Delegation Recovery (re: client restart/lease expiration)
A server MAY support claim types of CLAIM_DELEGATE_PREV and CLAIM_DELEG_PREV_FH, and if it does, it MUST NOT remove delegations upon a CREATE_SESSION that confirm a client ID created by EXCHANGE_ID.  Instead, the server MUST, for a period of time no less than that of the value of the lease_time attribute, maintain the client's delegations to allow time for the client to send CLAIM_DELEGATE_PREV and/or CLAIM_DELEG_PREV_FH requests.  The server that supports CLAIM_DELEGATE_PREV and/or CLAIM_DELEG_PREV_FH MUST support the DELEGPURGE operation.

if there's a delegation to reclaim, recover_open_no_grace() now tries CLAIM_DELEGATE_PREV (supported by emc server, but not linux) before falling back to CLAIM_NULL
nfs41_client_delegation_recovery() sends DELEGPURGE to indicate that we're finished reclaiming delegations

Signed-off-by: Casey Bodley <cbodley@citi.umich.edu>
This commit is contained in:
Casey Bodley 2011-07-20 13:46:36 -04:00 • committed by unknown
parent 8e310c5711
commit b9b3b00e76
5 changed files with 96 additions and 4 deletions
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29
daemon/nfs41_ops.c
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@ -1527,6 +1527,35 @@ out:
return status;
}
int nfs41_delegpurge(
IN nfs41_session *session)
{
int status;
nfs41_compound compound;
nfs_argop4 argops[2];
nfs_resop4 resops[2];
nfs41_sequence_args sequence_args;
nfs41_sequence_res sequence_res;
nfs41_delegpurge_res dp_res;
compound_init(&compound, argops, resops, "delegpurge");
compound_add_op(&compound, OP_SEQUENCE, &sequence_args, &sequence_res);
status = nfs41_session_sequence(&sequence_args, session, 0);
if (status)
goto out;
compound_add_op(&compound, OP_DELEGPURGE, NULL, &dp_res);
status = compound_encode_send_decode(session, &compound, TRUE);
if (status)
goto out;
compound_error(status = compound.res.status);
out:
return status;
}
int nfs41_delegreturn(
IN nfs41_session *session,
IN nfs41_path_fh *file,