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NFSv4.x: Enforce the ca_maxresponsesize_cached on the back channel 

We have no duplicate reply cache, so we always set the back channel
ca_maxresponsesize_cached to zero when negotiating the session.
That means we should always error out as soon as we see the server
set args->csa_cachethis.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
This commit is contained in:
Trond Myklebust 2016-01-23 15:21:08 -05:00
parent f74a834a0e
commit 80f9642724
1 changed files with 6 additions and 3 deletions
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9
fs/nfs/callback_proc.c
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@ -381,9 +381,8 @@ validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
if (args->csa_cachethis == 0)
return htonl(NFS4ERR_RETRY_UNCACHED_REP);
/* The ca_maxresponsesize_cached is 0 with no DRC */
else if (args->csa_cachethis == 1)
return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
/* Liar! We never allowed you to set csa_cachethis != 0 */
return htonl(NFS4ERR_SEQ_FALSE_RETRY);
}
/* Wraparound */
@ -500,6 +499,10 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
cps->slotid = args->csa_slotid;
/* The ca_maxresponsesize_cached is 0 with no DRC */
if (args->csa_cachethis != 0)
return htonl(NFS4ERR_REP_TOO_BIG_TO_CACHE);
/*
* Check for pending referring calls. If a match is found, a
* related callback was received before the response to the original