From: Lars Ellenberg <lars.ellenberg@linbit.com>
Date: Wed, 24 Nov 2010 09:11:14 +0000 (+0100)
Subject: drbd: add packet_type 27 (return_code_only) to netlink api
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=42ff269d1022a86be4f526cf674998c47b7ab856;p=mv-sheeva.git

drbd: add packet_type 27 (return_code_only) to netlink api

In case we ever should add an other packet type,
we must not reuse 27, as that currently used for
"empty" return code only replies.
Document it as such.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
---

diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 80a389d24cd..6a6dde6c51c 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -2195,7 +2195,8 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
 		goto fail;
 	}
 
-	if (nlp->packet_type >= P_nl_after_last_packet) {
+	if (nlp->packet_type >= P_nl_after_last_packet ||
+	    nlp->packet_type == P_return_code_only) {
 		retcode = ERR_PACKET_NR;
 		goto fail;
 	}
@@ -2219,7 +2220,7 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
 	reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
 
 	reply->packet_type =
-		cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
+		cm->reply_body_size ? nlp->packet_type : P_return_code_only;
 	reply->minor = nlp->drbd_minor;
 	reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
 	/* reply->tag_list; might be modified by cm->function. */
@@ -2525,6 +2526,7 @@ void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
 	cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
 	cn_reply->flags = 0;
 
+	reply->packet_type = P_return_code_only;
 	reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
 	reply->ret_code = ret_code;
 
diff --git a/include/linux/drbd_nl.h b/include/linux/drbd_nl.h
index 8cde3945d1f..6fc614b06c4 100644
--- a/include/linux/drbd_nl.h
+++ b/include/linux/drbd_nl.h
@@ -146,9 +146,13 @@ NL_PACKET(new_c_uuid, 26,
        NL_BIT(		63,	T_MANDATORY,	clear_bm)
 )
 
+#ifdef NL_RESPONSE
+NL_RESPONSE(return_code_only, 27)
+#endif
+
 #undef NL_PACKET
 #undef NL_INTEGER
 #undef NL_INT64
 #undef NL_BIT
 #undef NL_STRING
-
+#undef NL_RESPONSE
diff --git a/include/linux/drbd_tag_magic.h b/include/linux/drbd_tag_magic.h
index fcdff8410e9..f14a165e82d 100644
--- a/include/linux/drbd_tag_magic.h
+++ b/include/linux/drbd_tag_magic.h
@@ -7,6 +7,7 @@
 /* declare packet_type enums */
 enum packet_types {
 #define NL_PACKET(name, number, fields) P_ ## name = number,
+#define NL_RESPONSE(name, number) P_ ## name = number,
 #define NL_INTEGER(pn, pr, member)
 #define NL_INT64(pn, pr, member)
 #define NL_BIT(pn, pr, member)