1 files changed, 19 insertions, 0 deletions

diff --git a/fs/nfs/delegation.c b/fs/nfs/delegation.c
index c6f07c1c71e6..d3be923d4e43 100644
--- a/fs/nfs/delegation.c
+++ b/fs/nfs/delegation.c
@@ -421,3 +421,22 @@ void nfs_delegation_reap_unclaimed(struct nfs4_client *clp)
                 nfs_free_delegation(delegation);
         }
 }
+
+int nfs4_copy_delegation_stateid(nfs4_stateid *dst, struct inode *inode)
+{
+        struct nfs4_client *clp = NFS_SERVER(inode)->nfs4_state;
+        struct nfs_inode *nfsi = NFS_I(inode);
+        struct nfs_delegation *delegation;
+        int res = 0;
+
+        if (nfsi->delegation_state == 0)
+                return 0;
+        spin_lock(&clp->cl_lock);
+        delegation = nfsi->delegation;
+        if (delegation != NULL) {
+                memcpy(dst->data, delegation->stateid.data, sizeof(dst->data));
+                res = 1;
+        }
+        spin_unlock(&clp->cl_lock);
+        return res;
+}