From a321d50f20dfc80d8c1d4aa8cec0238b9f440bc4 Mon Sep 17 00:00:00 2001
From: Benny Halevy <bhalevy@panasas.com>
Date: Fri, 3 Apr 2009 08:28:08 +0300
Subject: [PATCH] --- yaml --- r: 142192 b: refs/heads/master c:
 b85d4c01b76f6969a085d07a767fa45225cb14be h: refs/heads/master v: v3

---
 [refs]                          |  2 +-
 trunk/fs/nfsd/nfs4state.c       | 73 ++++++++++++++++++++++++++++++++-
 trunk/fs/nfsd/nfs4xdr.c         | 33 +++++++++++++--
 trunk/include/linux/nfsd/xdr4.h | 13 +++++-
 4 files changed, 114 insertions(+), 7 deletions(-)

diff --git a/[refs] b/[refs]
index 2ca98fac3666..f08fedbe53c7 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: a1bcecd29cdf1670df6908a620add4211c0abb7a
+refs/heads/master: b85d4c01b76f6969a085d07a767fa45225cb14be
diff --git a/trunk/fs/nfsd/nfs4state.c b/trunk/fs/nfsd/nfs4state.c
index dfc6d946cdfe..24b6e0593184 100644
--- a/trunk/fs/nfsd/nfs4state.c
+++ b/trunk/fs/nfsd/nfs4state.c
@@ -1000,6 +1000,32 @@ nfsd4_exchange_id(struct svc_rqst *rqstp,
 	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 @@ nfsd4_destroy_session(struct svc_rqst *r,
 }
 
 __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
diff --git a/trunk/fs/nfsd/nfs4xdr.c b/trunk/fs/nfsd/nfs4xdr.c
index bebf6d249069..8556575480ce 100644
--- a/trunk/fs/nfsd/nfs4xdr.c
+++ b/trunk/fs/nfsd/nfs4xdr.c
@@ -1113,7 +1113,16 @@ static __be32
 nfsd4_decode_sequence(struct nfsd4_compoundargs *argp,
 		      struct nfsd4_sequence *seq)
 {
-	return nfserr_opnotsupp;	/* stub */
+	DECODE_HEAD;
+
+	READ_BUF(NFS4_MAX_SESSIONID_LEN + 16);
+	COPYMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
+	READ32(seq->seqid);
+	READ32(seq->slotid);
+	READ32(seq->maxslots);
+	READ32(seq->cachethis);
+
+	DECODE_TAIL;
 }
 
 static __be32
@@ -2828,8 +2837,26 @@ static __be32
 nfsd4_encode_sequence(struct nfsd4_compoundres *resp, int nfserr,
 		      struct nfsd4_sequence *seq)
 {
-	/* stub */
-	return nfserr;
+	ENCODE_HEAD;
+
+	if (nfserr)
+		return nfserr;
+
+	RESERVE_SPACE(NFS4_MAX_SESSIONID_LEN + 20);
+	WRITEMEM(seq->sessionid.data, NFS4_MAX_SESSIONID_LEN);
+	WRITE32(seq->seqid);
+	WRITE32(seq->slotid);
+	WRITE32(seq->maxslots);
+	/*
+	 * FIXME: for now:
+	 *   target_maxslots = maxslots
+	 *   status_flags = 0
+	 */
+	WRITE32(seq->maxslots);
+	WRITE32(0);
+
+	ADJUST_ARGS();
+	return 0;
 }
 
 static __be32
diff --git a/trunk/include/linux/nfsd/xdr4.h b/trunk/include/linux/nfsd/xdr4.h
index 33ee71e988b4..6e28a041008d 100644
--- a/trunk/include/linux/nfsd/xdr4.h
+++ b/trunk/include/linux/nfsd/xdr4.h
@@ -48,6 +48,9 @@ struct nfsd4_compound_state {
 	struct svc_fh		current_fh;
 	struct svc_fh		save_fh;
 	struct nfs4_stateowner	*replay_owner;
+	/* For sessions DRC */
+	struct nfsd4_session	*session;
+	struct nfsd4_slot	*slot;
 };
 
 struct nfsd4_change_info {
@@ -358,7 +361,15 @@ struct nfsd4_create_session {
 };
 
 struct nfsd4_sequence {
-	int	foo;	/* stub */
+	struct nfs4_sessionid	sessionid;		/* request/response */
+	u32			seqid;			/* request/response */
+	u32			slotid;			/* request/response */
+	u32			maxslots;		/* request/response */
+	u32			cachethis;		/* request */
+#if 0
+	u32			target_maxslots;	/* response */
+	u32			status_flags;		/* response */
+#endif /* not yet */
 };
 
 struct nfsd4_destroy_session {