[DLM] reject replies to old requests

[powerpc.git] / fs / dlm / rcom.c

diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c
index 5573d85..64ba492 100644 (file)
--- a/fs/dlm/rcom.c
+++ b/fs/dlm/rcom.c
@@ -108,6 +108,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid)
        error = create_rcom(ls, nodeid, DLM_RCOM_STATUS, 0, &rc, &mh);
        if (error)
                goto out;
+       rc->rc_id = ++ls->ls_rcom_seq;
 
        send_rcom(ls, mh, rc);
 
@@ -140,19 +141,30 @@ static void receive_rcom_status(struct dlm_ls *ls, struct dlm_rcom *rc_in)
                            sizeof(struct rcom_config), &rc, &mh);
        if (error)
                return;
+       rc->rc_id = rc_in->rc_id;
        rc->rc_result = dlm_recover_status(ls);
        make_config(ls, (struct rcom_config *) rc->rc_buf);
 
        send_rcom(ls, mh, rc);
 }
 
-static void receive_rcom_status_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+static void receive_sync_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 {
+       if (rc_in->rc_id != ls->ls_rcom_seq) {
+               log_debug(ls, "reject old reply %d got %llx wanted %llx",
+                         rc_in->rc_type, rc_in->rc_id, ls->ls_rcom_seq);
+               return;
+       }
        memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
        set_bit(LSFL_RCOM_READY, &ls->ls_flags);
        wake_up(&ls->ls_wait_general);
 }
 
+static void receive_rcom_status_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
+{
+       receive_sync_reply(ls, rc_in);
+}
+
 int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
 {
        struct dlm_rcom *rc;
@@ -173,6 +185,7 @@ int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
        if (error)
                goto out;
        memcpy(rc->rc_buf, last_name, last_len);
+       rc->rc_id = ++ls->ls_rcom_seq;
 
        send_rcom(ls, mh, rc);
 
@@ -209,6 +222,7 @@ static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
        error = create_rcom(ls, nodeid, DLM_RCOM_NAMES_REPLY, outlen, &rc, &mh);
        if (error)
                return;
+       rc->rc_id = rc_in->rc_id;
 
        dlm_copy_master_names(ls, rc_in->rc_buf, inlen, rc->rc_buf, outlen,
                              nodeid);
@@ -217,9 +231,7 @@ static void receive_rcom_names(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 
 static void receive_rcom_names_reply(struct dlm_ls *ls, struct dlm_rcom *rc_in)
 {
-       memcpy(ls->ls_recover_buf, rc_in, rc_in->rc_header.h_length);
-       set_bit(LSFL_RCOM_READY, &ls->ls_flags);
-       wake_up(&ls->ls_wait_general);
+       receive_sync_reply(ls, rc_in);
 }
 
 int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid)