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Diffstat (limited to 'fs/nfs/callback_proc.c')
-rw-r--r--fs/nfs/callback_proc.c38
1 files changed, 23 insertions, 15 deletions
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 197806fb87ff..29e3c1b011b7 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -327,10 +327,8 @@ validate_seqid(struct nfs4_slot_table *tbl, struct cb_sequenceargs * args)
dprintk("%s slot table seqid: %u\n", __func__, slot->seq_nr);
/* Normal */
- if (likely(args->csa_sequenceid == slot->seq_nr + 1)) {
- slot->seq_nr++;
+ if (likely(args->csa_sequenceid == slot->seq_nr + 1))
goto out_ok;
- }
/* Replay */
if (args->csa_sequenceid == slot->seq_nr) {
@@ -418,6 +416,7 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
struct cb_process_state *cps)
{
struct nfs4_slot_table *tbl;
+ struct nfs4_slot *slot;
struct nfs_client *clp;
int i;
__be32 status = htonl(NFS4ERR_BADSESSION);
@@ -429,25 +428,32 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
if (!(clp->cl_session->flags & SESSION4_BACK_CHAN))
goto out;
+
tbl = &clp->cl_session->bc_slot_table;
+ slot = tbl->slots + args->csa_slotid;
spin_lock(&tbl->slot_tbl_lock);
/* state manager is resetting the session */
if (test_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
- spin_unlock(&tbl->slot_tbl_lock);
status = htonl(NFS4ERR_DELAY);
/* Return NFS4ERR_BADSESSION if we're draining the session
* in order to reset it.
*/
if (test_bit(NFS4CLNT_SESSION_RESET, &clp->cl_state))
status = htonl(NFS4ERR_BADSESSION);
- goto out;
+ goto out_unlock;
}
- status = validate_seqid(&clp->cl_session->bc_slot_table, args);
- spin_unlock(&tbl->slot_tbl_lock);
+ memcpy(&res->csr_sessionid, &args->csa_sessionid,
+ sizeof(res->csr_sessionid));
+ res->csr_sequenceid = args->csa_sequenceid;
+ res->csr_slotid = args->csa_slotid;
+ res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
+ res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
+
+ status = validate_seqid(tbl, args);
if (status)
- goto out;
+ goto out_unlock;
cps->slotid = args->csa_slotid;
@@ -458,15 +464,17 @@ __be32 nfs4_callback_sequence(struct cb_sequenceargs *args,
*/
if (referring_call_exists(clp, args->csa_nrclists, args->csa_rclists)) {
status = htonl(NFS4ERR_DELAY);
- goto out;
+ goto out_unlock;
}
- memcpy(&res->csr_sessionid, &args->csa_sessionid,
- sizeof(res->csr_sessionid));
- res->csr_sequenceid = args->csa_sequenceid;
- res->csr_slotid = args->csa_slotid;
- res->csr_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
- res->csr_target_highestslotid = NFS41_BC_MAX_CALLBACKS - 1;
+ /*
+ * RFC5661 20.9.3
+ * If CB_SEQUENCE returns an error, then the state of the slot
+ * (sequence ID, cached reply) MUST NOT change.
+ */
+ slot->seq_nr++;
+out_unlock:
+ spin_unlock(&tbl->slot_tbl_lock);
out:
cps->clp = clp; /* put in nfs4_callback_compound */