nfs41: Release backchannel resources associated with session

Frees the preallocated backchannel resources that are associated with
this session when the session is destroyed.

A backchannel is currently created once per session. Destroy the backchannel
only when the session is destroyed.

Signed-off-by: Ricardo Labiaga <ricardo.labiaga@netapp.com>
Signed-off-by: Andy Adamson<andros@netapp.com>
Signed-off-by: Benny Halevy <bhalevy@panasas.com>

2 files changed, 6 insertions, 1 deletions

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 4213c8814997..5da939d577d5 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -49,6 +49,7 @@
 #include <linux/namei.h>
 #include <linux/mount.h>
 #include <linux/module.h>
+#include <linux/sunrpc/bc_xprt.h>
 
 #include "nfs4_fs.h"
 #include "delegation.h"
@@ -4481,6 +4482,11 @@ struct nfs4_session *nfs4_alloc_session(struct nfs_client *clp)
 
 void nfs4_destroy_session(struct nfs4_session *session)
 {
+        nfs4_proc_destroy_session(session);
+        dprintk("%s Destroy backchannel for xprt %p\n",
+                __func__, session->clp->cl_rpcclient->cl_xprt);
+        xprt_destroy_backchannel(session->clp->cl_rpcclient->cl_xprt,
+                                NFS41_BC_MIN_CALLBACKS);
         nfs4_destroy_slot_table(session);
         kfree(session);
 }
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 73db6f8c145a..69804a8245f6 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -2488,7 +2488,6 @@ static void nfs4_kill_super(struct super_block *sb)
         dprintk("--> %s\n", __func__);
         nfs_super_return_all_delegations(sb);
         kill_anon_super(sb);
-
         nfs4_renewd_prepare_shutdown(server);
         nfs_fscache_release_super_cookie(sb);
         nfs_free_server(server);