nfsd41: sequence operation
Implement the sequence operation conforming to
http://tools.ietf.org/html/draft-ietf-nfsv4-minorversion1-26
Check for stale clientid (as derived from the sessionid).
Enforce slotid range and exactly-once semantics using
the slotid and seqid.
If everything went well renew the client lease and
mark the slot INPROGRESS.
Add a struct nfsd4_slot pointer to struct nfsd4_compound_state.
To be used for sessions DRC replay.
[nfsd41: rename sequence catchthis to cachethis]
Signed-off-by: Andy Adamson<andros@netapp.com>
[pulled some code to set cstate->slot from "nfsd DRC logic"]
[use sessionid_lock spin lock]
[nfsd41: use bool inuse for slot state]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd: add a struct nfsd4_slot pointer to struct nfsd4_compound_state]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[nfsd41: add nfsd4_session pointer to nfsd4_compound_state]
[nfsd41: set cstate session]
[nfsd41: use cstate session in nfsd4_sequence]
Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[simplify nfsd4_encode_sequence error handling]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index dfc6d94..24b6e05 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1000,6 +1000,32 @@
return status;
}
+static int
+check_slot_seqid(u32 seqid, struct nfsd4_slot *slot)
+{
+ dprintk("%s enter. seqid %d slot->sl_seqid %d\n", __func__, seqid,
+ slot->sl_seqid);
+
+ /* The slot is in use, and no response has been sent. */
+ if (slot->sl_inuse) {
+ if (seqid == slot->sl_seqid)
+ return nfserr_jukebox;
+ else
+ return nfserr_seq_misordered;
+ }
+ /* Normal */
+ if (likely(seqid == slot->sl_seqid + 1))
+ return nfs_ok;
+ /* Replay */
+ if (seqid == slot->sl_seqid)
+ return nfserr_replay_cache;
+ /* Wraparound */
+ if (seqid == 1 && (slot->sl_seqid + 1) == 0)
+ return nfs_ok;
+ /* Misordered replay or misordered new request */
+ return nfserr_seq_misordered;
+}
+
__be32
nfsd4_create_session(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
@@ -1017,11 +1043,54 @@
}
__be32
-nfsd4_sequence(struct svc_rqst *r,
+nfsd4_sequence(struct svc_rqst *rqstp,
struct nfsd4_compound_state *cstate,
struct nfsd4_sequence *seq)
{
- return -1; /* stub */
+ struct nfsd4_session *session;
+ struct nfsd4_slot *slot;
+ int status;
+
+ spin_lock(&sessionid_lock);
+ status = nfserr_badsession;
+ session = find_in_sessionid_hashtbl(&seq->sessionid);
+ if (!session)
+ goto out;
+
+ status = nfserr_badslot;
+ if (seq->slotid >= session->se_fnumslots)
+ goto out;
+
+ slot = &session->se_slots[seq->slotid];
+ dprintk("%s: slotid %d\n", __func__, seq->slotid);
+
+ status = check_slot_seqid(seq->seqid, slot);
+ if (status == nfserr_replay_cache) {
+ cstate->slot = slot;
+ cstate->session = session;
+ goto replay_cache;
+ }
+ if (status)
+ goto out;
+
+ /* Success! bump slot seqid */
+ slot->sl_inuse = true;
+ slot->sl_seqid = seq->seqid;
+
+ cstate->slot = slot;
+ cstate->session = session;
+
+replay_cache:
+ /* Renew the clientid on success and on replay.
+ * Hold a session reference until done processing the compound:
+ * nfsd4_put_session called only if the cstate slot is set.
+ */
+ renew_client(session->se_client);
+ nfsd4_get_session(session);
+out:
+ spin_unlock(&sessionid_lock);
+ dprintk("%s: return %d\n", __func__, ntohl(status));
+ return status;
}
__be32