From: "J. Bruce Fields" <bfields@xxxxxxxxxx>
destroy_session uses the session and client without continuously holding
any reference or locks.
Put the whole thing under the state lock for now.
Signed-off-by: J. Bruce Fields <bfields@xxxxxxxxxx>
---
fs/nfsd/nfs4state.c | 26 ++++++++++----------------
1 file changed, 10 insertions(+), 16 deletions(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 1464d62..05ebcf5 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1922,41 +1922,35 @@ nfsd4_destroy_session(struct svc_rqst *r,
struct nfsd4_destroy_session *sessionid)
{
struct nfsd4_session *ses;
- __be32 status = nfserr_badsession;
+ __be32 status;
struct nfsd_net *nn = net_generic(SVC_NET(r), nfsd_net_id);
- /* Notes:
- * - The confirmed nfs4_client->cl_sessionid holds destroyed sessinid
- * - Should we return nfserr_back_chan_busy if waiting for
- * callbacks on to-be-destroyed session?
- * - Do we need to clear any callback info from previous session?
- */
-
+ nfs4_lock_state();
+ status = nfserr_not_only_op;
if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
if (!nfsd4_last_compound_op(r))
- return nfserr_not_only_op;
+ goto out;
}
dump_sessionid(__func__, &sessionid->sessionid);
spin_lock(&nn->client_lock);
ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
- if (!ses) {
- spin_unlock(&nn->client_lock);
- goto out;
- }
+ status = nfserr_badsession;
+ if (!ses)
+ goto out_client_lock;
unhash_session(ses);
spin_unlock(&nn->client_lock);
- nfs4_lock_state();
nfsd4_probe_callback_sync(ses->se_client);
- nfs4_unlock_state();
spin_lock(&nn->client_lock);
nfsd4_del_conns(ses);
nfsd4_put_session_locked(ses);
- spin_unlock(&nn->client_lock);
status = nfs_ok;
+out_client_lock:
+ spin_unlock(&nn->client_lock);
out:
+ nfs4_unlock_state();
return status;
}
--
1.7.9.5
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