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-rw-r--r--fs/nfs/nfs4proc.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index ed6c8899806..a2855391b07 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -423,6 +423,22 @@ out:
return ret_id;
}
+static int nfs4_recover_session(struct nfs4_session *session)
+{
+ struct nfs_client *clp = session->clp;
+ int ret;
+
+ for (;;) {
+ ret = nfs4_wait_clnt_recover(clp);
+ if (ret != 0)
+ return ret;
+ if (!test_bit(NFS4CLNT_SESSION_SETUP, &clp->cl_state))
+ break;
+ nfs4_schedule_state_manager(clp);
+ }
+ return 0;
+}
+
static int nfs41_setup_sequence(struct nfs4_session *session,
struct nfs4_sequence_args *args,
struct nfs4_sequence_res *res,
@@ -431,6 +447,7 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
{
struct nfs4_slot *slot;
struct nfs4_slot_table *tbl;
+ int status = 0;
u8 slotid;
dprintk("--> %s\n", __func__);
@@ -443,6 +460,23 @@ static int nfs41_setup_sequence(struct nfs4_session *session,
tbl = &session->fc_slot_table;
spin_lock(&tbl->slot_tbl_lock);
+ if (test_bit(NFS4CLNT_SESSION_SETUP, &session->clp->cl_state)) {
+ if (tbl->highest_used_slotid != -1) {
+ rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);
+ spin_unlock(&tbl->slot_tbl_lock);
+ dprintk("<-- %s: Session reset: draining\n", __func__);
+ return -EAGAIN;
+ }
+
+ /* The slot table is empty; start the reset thread */
+ dprintk("%s Session Reset\n", __func__);
+ spin_unlock(&tbl->slot_tbl_lock);
+ status = nfs4_recover_session(session);
+ if (status)
+ return status;
+ spin_lock(&tbl->slot_tbl_lock);
+ }
+
slotid = nfs4_find_slot(tbl, task);
if (slotid == NFS4_MAX_SLOT_TABLE) {
rpc_sleep_on(&tbl->slot_tbl_waitq, task, NULL);