From: Andy Adamson <andros@xxxxxxxxxx>
CREATE_SESSION can be preceeded by a SEQUENCE operation (an embedded
CREATE_SESSION) and the create session single slot cache must be maintained.
Always replay a create session from nfsd4_replay_create_session(). Leave
nfsd4_store_cache_entry() for session (sequence operation) replays.
Set cstate->status to a new internal error, nfserr_replay_clientid_cache, and
change the logic in nfsd4_proc_compound so that CREATE_SESSION replays replace
encode_operation.
The new internal error is needed to differentiate between an embedded
CREATE_SESSION replay and a SEQUENCE replay.
Signed-off-by: Andy Adamson <andros@xxxxxxxxxx>
---
fs/nfsd/nfs4proc.c | 9 +++++++--
fs/nfsd/nfs4state.c | 5 +++++
fs/nfsd/nfs4xdr.c | 17 +++++++++++++++++
include/linux/nfsd/nfsd.h | 2 ++
include/linux/nfsd/xdr4.h | 2 ++
5 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/fs/nfsd/nfs4proc.c b/fs/nfsd/nfs4proc.c
index b2883e9..32d5866 100644
--- a/fs/nfsd/nfs4proc.c
+++ b/fs/nfsd/nfs4proc.c
@@ -996,7 +996,7 @@ nfsd4_proc_compound(struct svc_rqst *rqstp,
BUG_ON(op->status == nfs_ok);
encode_op:
- /* Only from SEQUENCE or CREATE_SESSION */
+ /* Only from SEQUENCE */
if (resp->cstate.status == nfserr_replay_cache) {
dprintk("%s NFS4.1 replay from cache\n", __func__);
if (nfsd4_not_cached(resp))
@@ -1005,7 +1005,12 @@ encode_op:
status = op->status;
goto out;
}
- if (op->status == nfserr_replay_me) {
+ /* Only from CREATE_SESSION */
+ if (resp->cstate.status == nfserr_replay_clientid_cache) {
+ dprintk("%s NFS4.1 replay from clientid cache\n",
+ __func__);
+ status = op->status;
+ } else if (op->status == nfserr_replay_me) {
op->replay = &cstate->replay_owner->so_replay;
nfsd4_encode_replay(resp, op);
status = op->status = op->replay->rp_status;
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index de7cc51..e216169 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -1350,6 +1350,7 @@ nfsd4_create_session(struct svc_rqst *rqstp,
struct nfsd4_create_session *cr_ses)
{
u32 ip_addr = svc_addr_in(rqstp)->sin_addr.s_addr;
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
struct nfs4_client *conf, *unconf;
struct nfsd4_clid_slot *slot = NULL;
int status = 0;
@@ -1364,6 +1365,10 @@ nfsd4_create_session(struct svc_rqst *rqstp,
if (status == nfserr_replay_cache) {
dprintk("Got a create_session replay! seqid= %d\n",
slot->sl_seqid);
+ cstate->status = nfserr_replay_clientid_cache;
+ /* Return the cached reply status */
+ status = nfsd4_replay_create_session(resp, slot);
+ goto out;
} else if (cr_ses->seqid != conf->cl_slot.sl_seqid + 1) {
status = nfserr_seq_misordered;
dprintk("Sequence misordered!\n");
diff --git a/fs/nfsd/nfs4xdr.c b/fs/nfsd/nfs4xdr.c
index 1dfec1d..238612e 100644
--- a/fs/nfsd/nfs4xdr.c
+++ b/fs/nfsd/nfs4xdr.c
@@ -3064,6 +3064,23 @@ nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
slot->sl_datalen = (char *)resp->p - (char *)p;
}
+__be32
+nfsd4_replay_create_session(struct nfsd4_compoundres *resp,
+ struct nfsd4_clid_slot *slot)
+{
+ __be32 *p;
+
+ RESERVE_SPACE(8);
+ WRITE32(OP_CREATE_SESSION);
+ *p++ = slot->sl_status; /* already in network byte order */
+ ADJUST_ARGS();
+
+ memcpy(resp->p, slot->sl_data, slot->sl_datalen);
+ p += XDR_QUADLEN(slot->sl_datalen);
+ ADJUST_ARGS();
+ return slot->sl_status;
+}
+
static __be32
nfsd4_encode_destroy_session(struct nfsd4_compoundres *resp, int nfserr,
struct nfsd4_destroy_session *destroy_session)
diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index 2b49d67..9cd6399 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -301,6 +301,8 @@ void nfsd_lockd_shutdown(void);
#define nfserr_replay_me cpu_to_be32(11001)
/* nfs41 replay detected */
#define nfserr_replay_cache cpu_to_be32(11002)
+/* nfs41 clientid cache replay detected */
+#define nfserr_replay_clientid_cache cpu_to_be32(11003)
/* Check for dir entries '.' and '..' */
#define isdotent(n, l) (l < 3 && n[0] == '.' && (l == 1 || n[1] == '.'))
diff --git a/include/linux/nfsd/xdr4.h b/include/linux/nfsd/xdr4.h
index 21e0b73..ac00985 100644
--- a/include/linux/nfsd/xdr4.h
+++ b/include/linux/nfsd/xdr4.h
@@ -519,6 +519,8 @@ extern __be32 nfsd4_replay_cache_entry(struct nfsd4_compoundres *resp,
struct nfsd4_sequence *seq);
extern void nfsd4_cache_create_session(struct nfsd4_create_session *cr_ses,
struct nfsd4_clid_slot *slot, int nfserr);
+extern __be32 nfsd4_replay_create_session(struct nfsd4_compoundres *resp,
+ struct nfsd4_clid_slot *slot);
extern __be32 nfsd4_exchange_id(struct svc_rqst *rqstp,
struct nfsd4_compound_state *,
struct nfsd4_exchange_id *);
--
1.5.4.3
--
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