NFSv4.1 end back channel session draining
Andy Adamson [Wed, 19 Jun 2013 20:39:44 +0000 (16:39 -0400)]
commit 62f288a02f97bd9f6b2361a6fff709729fe9e110 upstream.

We need to ensure that we clear NFS4_SLOT_TBL_DRAINING on the back
channel when we're done recovering the session.

Regression introduced by commit 774d5f14e (NFSv4.1 Fix a pNFS session
draining deadlock)

Signed-off-by: Andy Adamson <andros@netapp.com>
[Trond: Changed order to start back-channel first. Minor code cleanup]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

fs/nfs/nfs4state.c

index 1fab140..2c37442 100644 (file)
@@ -228,19 +228,8 @@ static int nfs41_setup_state_renewal(struct nfs_client *clp)
        return status;
 }
 
-/*
- * Back channel returns NFS4ERR_DELAY for new requests when
- * NFS4_SESSION_DRAINING is set so there is no work to be done when draining
- * is ended.
- */
-static void nfs4_end_drain_session(struct nfs_client *clp)
+static void nfs4_end_drain_slot_table(struct nfs4_slot_table *tbl)
 {
-       struct nfs4_session *ses = clp->cl_session;
-       struct nfs4_slot_table *tbl;
-
-       if (ses == NULL)
-               return;
-       tbl = &ses->fc_slot_table;
        if (test_and_clear_bit(NFS4_SLOT_TBL_DRAINING, &tbl->slot_tbl_state)) {
                spin_lock(&tbl->slot_tbl_lock);
                nfs41_wake_slot_table(tbl);
@@ -248,6 +237,16 @@ static void nfs4_end_drain_session(struct nfs_client *clp)
        }
 }
 
+static void nfs4_end_drain_session(struct nfs_client *clp)
+{
+       struct nfs4_session *ses = clp->cl_session;
+
+       if (ses != NULL) {
+               nfs4_end_drain_slot_table(&ses->bc_slot_table);
+               nfs4_end_drain_slot_table(&ses->fc_slot_table);
+       }
+}
+
 /*
  * Signal state manager thread if session fore channel is drained
  */