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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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10
daemon/delegation.c
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@ -669,7 +669,15 @@ int nfs41_client_delegation_recovery(
}
if (status == NFS4ERR_BADSESSION)
break;
goto out;
}
/* use DELEGPURGE to indicate that we're done reclaiming delegations */
status = nfs41_delegpurge(client->session);
/* support for DELEGPURGE is optional; ignore any errors but BADSESSION */
if (status != NFS4ERR_BADSESSION)
status = NFS4_OK;
out:
return status;
}