NFSv4: Handle NFS4ERR_DELAY and NFS4ERR_GRACE in nfs4_open_delegation_recall

A server shouldn't normally return NFS4ERR_GRACE if the client holds a
delegation, since no conflicting lock reclaims can be granted, however
the spec does not require the server to grant the open in this
instance

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: stable@vger.kernel.org

diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index e7c0e646b9c5c333fb6d74587fd92b829394e7b1..a549ffef9f7193b6ee935665f8018fff9460ea07 100644 (file)
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1432,6 +1432,12 @@ int nfs4_open_delegation_recall(struct nfs_open_context *ctx, struct nfs4_state
                        case -ENOMEM:
                                err = 0;
                                goto out;
+                       case -NFS4ERR_DELAY:
+                       case -NFS4ERR_GRACE:
+                               set_bit(NFS_DELEGATED_STATE, &state->flags);
+                               ssleep(1);
+                               err = -EAGAIN;
+                               goto out;
                }
                set_bit(NFS_DELEGATED_STATE, &state->flags);
                err = nfs4_handle_exception(server, err, &exception);