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NFSv4.1: Delay callback processing when there are referring triples

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If CB_SEQUENCE tells us that the processing of this request depends on
the completion of one or more referring triples (see RFC 5661 Section
2.10.6.3), delay the callback processing until after the RPC requests
being referred to have completed.
If we end up delaying for more than 1/2 second, then fall back to
returning NFS4ERR_DELAY in reply to the callback.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-08-28 13:25:43 -04:00
parent e09c978aae
commit 045d2a6d07
4 changed files with 29 additions and 4 deletions
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4
fs/nfs/callback_proc.c
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@ -454,8 +454,8 @@ static bool referring_call_exists(struct nfs_client *clp,
((u32 *)&rclist->rcl_sessionid.data)[3],
ref->rc_sequenceid, ref->rc_slotid);
status = nfs4_slot_seqid_in_use(tbl, ref->rc_slotid,
ref->rc_sequenceid);
status = nfs4_slot_wait_on_seqid(tbl, ref->rc_slotid,
ref->rc_sequenceid, HZ >> 1) < 0;
if (status)
goto out;
}