NFSv4: Clean up NFS4ERR_CB_PATH_DOWN error management...

Add a delegation cleanup phase to the state management loop, and do the
NFS4ERR_CB_PATH_DOWN recovery there.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

4 files changed, 16 insertions, 10 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index bc9d4f9a788d..ff2c1585d23f 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -258,7 +258,7 @@ static int __nfs_inode_return_delegation(struct inode *inode, struct nfs_delegat
 /*
  * Return all delegations that have been marked for return
  */
-static void nfs_client_return_marked_delegations(struct nfs_client *clp)
+void nfs_client_return_marked_delegations(struct nfs_client *clp)
 {
         struct nfs_delegation *delegation;
         struct inode *inode;
@@ -342,15 +342,16 @@ void nfs_super_return_all_delegations(struct super_block *sb)
         nfs_client_return_marked_delegations(clp);
 }
 
-static void nfs_client_return_all_delegations(struct nfs_client *clp)
+static void nfs_client_mark_return_all_delegations(struct nfs_client *clp)
 {
         struct nfs_delegation *delegation;
 
         rcu_read_lock();
-        list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list)
+        list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
                 set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
+                set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
+        }
         rcu_read_unlock();
-        nfs_client_return_marked_delegations(clp);
 }
 
 static int nfs_do_expire_all_delegations(void *ptr)
@@ -363,7 +364,8 @@ static int nfs_do_expire_all_delegations(void *ptr)
                 goto out;
         if (test_bit(NFS4CLNT_LEASE_EXPIRED, &clp->cl_state) == 0)
                 goto out;
-        nfs_client_return_all_delegations(clp);
+        nfs_client_mark_return_all_delegations(clp);
+        nfs_client_return_marked_delegations(clp);
 out:
         nfs_put_client(clp);
         module_put_and_exit(0);
@@ -392,7 +394,7 @@ void nfs_handle_cb_pathdown(struct nfs_client *clp)
 {
         if (clp == NULL)
                 return;
-        nfs_client_return_all_delegations(clp);
+        nfs_client_mark_return_all_delegations(clp);
 }
 
 struct recall_threadargs {
diff --git a/fs/nfs/delegation.h b/fs/nfs/delegation.h
index c772bab12eea..56f3eb558ef4 100644
--- a/fs/nfs/delegation.h
+++ b/fs/nfs/delegation.h
@@ -40,6 +40,7 @@ struct inode *nfs_delegation_find_inode(struct nfs_client *clp, const struct nfs
 void nfs_super_return_all_delegations(struct super_block *sb);
 void nfs_expire_all_delegations(struct nfs_client *clp);
 void nfs_handle_cb_pathdown(struct nfs_client *clp);
+void nfs_client_return_marked_delegations(struct nfs_client *clp);
 
 void nfs_delegation_mark_reclaim(struct nfs_client *clp);
 void nfs_delegation_reap_unclaimed(struct nfs_client *clp);
diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index 46cbc0cdf885..84a4f5223f61 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -43,7 +43,7 @@ enum nfs4_client_state {
         NFS4CLNT_LEASE_EXPIRED,
         NFS4CLNT_RECLAIM_REBOOT,
         NFS4CLNT_RECLAIM_NOGRACE,
-        NFS4CLNT_CB_PATH_DOWN,
+        NFS4CLNT_DELEGRETURN,
 };
 
 /*
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 3d78706b3efb..2894502b94dc 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1027,7 +1027,7 @@ static void nfs4_recovery_handle_error(struct nfs_client *clp, int error)
 {
         switch (error) {
                 case -NFS4ERR_CB_PATH_DOWN:
-                        set_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state);
+                        nfs_handle_cb_pathdown(clp);
                         break;
                 case -NFS4ERR_STALE_CLIENTID:
                 case -NFS4ERR_LEASE_MOVED:
@@ -1156,11 +1156,14 @@ static int reclaimer(void *ptr)
                                 nfs4_state_end_reclaim_nograce(clp);
                         continue;
                 }
+
+                if (test_and_clear_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state)) {
+                        nfs_client_return_marked_delegations(clp);
+                        continue;
+                }
                 break;
         }
 out:
-        if (test_and_clear_bit(NFS4CLNT_CB_PATH_DOWN, &clp->cl_state))
-                nfs_handle_cb_pathdown(clp);
         nfs4_clear_recover_bit(clp);
         nfs_put_client(clp);
         module_put_and_exit(0);