fs: dlm: set skb mark per peer socket

This patch adds support to set the skb mark value for the DLM tcp and
sctp socket per peer. The mark value will be offered as per comm value
of configfs. At creation time of the peer socket it will be set as
socket option.

Signed-off-by: Alexander Aring <aahringo@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>

1 files changed, 38 insertions, 0 deletions

diff --git a/fs/dlm/config.c b/fs/dlm/config.c
index d74655cd6cd3..47f0b98b707f 100644
--- a/fs/dlm/config.c
+++ b/fs/dlm/config.c
@@ -200,6 +200,7 @@ enum {
 	COMM_ATTR_LOCAL,
 	COMM_ATTR_ADDR,
 	COMM_ATTR_ADDR_LIST,
+	COMM_ATTR_MARK,
 };
 
 enum {
@@ -232,6 +233,7 @@ struct dlm_comm {
 	int nodeid;
 	int local;
 	int addr_count;
+	unsigned int mark;
 	struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 };
 
@@ -469,6 +471,7 @@ static struct config_item *make_comm(struct config_group *g, const char *name)
 	cm->nodeid = -1;
 	cm->local = 0;
 	cm->addr_count = 0;
+	cm->mark = 0;
 	return &cm->item;
 }
 
@@ -664,8 +667,28 @@ static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 	return 4096 - allowance;
 }
 
+static ssize_t comm_mark_show(struct config_item *item, char *buf)
+{
+	return sprintf(buf, "%u\n", config_item_to_comm(item)->mark);
+}
+
+static ssize_t comm_mark_store(struct config_item *item, const char *buf,
+			       size_t len)
+{
+	unsigned int mark;
+	int rc;
+
+	rc = kstrtouint(buf, 0, &mark);
+	if (rc)
+		return rc;
+
+	config_item_to_comm(item)->mark = mark;
+	return len;
+}
+
 CONFIGFS_ATTR(comm_, nodeid);
 CONFIGFS_ATTR(comm_, local);
+CONFIGFS_ATTR(comm_, mark);
 CONFIGFS_ATTR_WO(comm_, addr);
 CONFIGFS_ATTR_RO(comm_, addr_list);
 
@@ -674,6 +697,7 @@ static struct configfs_attribute *comm_attrs[] = {
 	[COMM_ATTR_LOCAL] = &comm_attr_local,
 	[COMM_ATTR_ADDR] = &comm_attr_addr,
 	[COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
+	[COMM_ATTR_MARK] = &comm_attr_mark,
 	NULL,
 };
 
@@ -833,6 +857,20 @@ int dlm_comm_seq(int nodeid, uint32_t *seq)
 	return 0;
 }
 
+int dlm_comm_mark(int nodeid, unsigned int *mark)
+{
+	struct dlm_comm *cm;
+
+	cm = get_comm(nodeid);
+	if (!cm)
+		return -ENOENT;
+
+	*mark = cm->mark;
+	put_comm(cm);
+
+	return 0;
+}
+
 int dlm_our_nodeid(void)
 {
 	return local_comm ? local_comm->nodeid : 0;