NFSv4: Return unreferenced delegations more promptly

[linux-2.6-omap-h63xx.git] / fs / nfs / delegation.c

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index 00c350c031b40832d54864b3b5f7dcc8bb40a6b3..e75f2f8c5245a64a86f14aed22354f2da8c0004b 100644 (file)
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -43,6 +43,27 @@ static void nfs_free_delegation(struct nfs_delegation *delegation)
                put_rpccred(cred);
 }
 
+void nfs_mark_delegation_referenced(struct nfs_delegation *delegation)
+{
+       set_bit(NFS_DELEGATION_REFERENCED, &delegation->flags);
+}
+
+int nfs_have_delegation(struct inode *inode, int flags)
+{
+       struct nfs_delegation *delegation;
+       int ret = 0;
+
+       flags &= FMODE_READ|FMODE_WRITE;
+       rcu_read_lock();
+       delegation = rcu_dereference(NFS_I(inode)->delegation);
+       if (delegation != NULL && (delegation->type & flags) == flags) {
+               nfs_mark_delegation_referenced(delegation);
+               ret = 1;
+       }
+       rcu_read_unlock();
+       return ret;
+}
+
 static int nfs_delegation_claim_locks(struct nfs_open_context *ctx, struct nfs4_state *state)
 {
        struct inode *inode = state->inode;
@@ -188,6 +209,7 @@ int nfs_inode_set_delegation(struct inode *inode, struct rpc_cred *cred, struct
        delegation->change_attr = nfsi->change_attr;
        delegation->cred = get_rpccred(cred);
        delegation->inode = inode;
+       delegation->flags = 1<<NFS_DELEGATION_REFERENCED;
        spin_lock_init(&delegation->lock);
 
        spin_lock(&clp->cl_lock);
@@ -382,6 +404,26 @@ void nfs_handle_cb_pathdown(struct nfs_client *clp)
        nfs_client_mark_return_all_delegations(clp);
 }
 
+static void nfs_client_mark_return_unreferenced_delegations(struct nfs_client *clp)
+{
+       struct nfs_delegation *delegation;
+
+       rcu_read_lock();
+       list_for_each_entry_rcu(delegation, &clp->cl_delegations, super_list) {
+               if (test_and_clear_bit(NFS_DELEGATION_REFERENCED, &delegation->flags))
+                       continue;
+               set_bit(NFS_DELEGATION_RETURN, &delegation->flags);
+               set_bit(NFS4CLNT_DELEGRETURN, &clp->cl_state);
+       }
+       rcu_read_unlock();
+}
+
+void nfs_expire_unreferenced_delegations(struct nfs_client *clp)
+{
+       nfs_client_mark_return_unreferenced_delegations(clp);
+       nfs_delegation_run_state_manager(clp);
+}
+
 /*
  * Asynchronous delegation recall!
  */