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nfsd: Ensure lookup_clientid() takes client_lock 

Ensure that the client lookup is done safely under the client_lock, so
we're not relying on the client_mutex.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Trond Myklebust 2014-07-30 08:27:09 -04:00 committed by J. Bruce Fields
parent 6b10ad193d
commit 3e339f964b
1 changed files with 6 additions and 2 deletions
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8
fs/nfsd/nfs4state.c
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@ -3451,13 +3451,17 @@ static __be32 lookup_clientid(clientid_t *clid,
* will be false.
*/
WARN_ON_ONCE(cstate->session);
spin_lock(&nn->client_lock);
found = find_confirmed_client(clid, false, nn);
if (!found)
if (!found) {
spin_unlock(&nn->client_lock);
return nfserr_expired;
}
atomic_inc(&found->cl_refcount);
spin_unlock(&nn->client_lock);
/* Cache the nfs4_client in cstate! */
cstate->clp = found;
atomic_inc(&found->cl_refcount);
return nfs_ok;
}