gfs2: Allow dlm callbacks in softirq context

Allow dlm to invoke the ast and bast callbacks in softirq rather than
work queue context.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>

fs/gfs2/lock_dlm.c

diff --git a/fs/gfs2/lock_dlm.c b/fs/gfs2/lock_dlm.c
index 58aeeae..adf11d3 100644
--- a/fs/gfs2/lock_dlm.c
+++ b/fs/gfs2/lock_dlm.c
@@ -1343,7 +1343,7 @@ static int gdlm_mount(struct gfs2_sbd *sdp, const char *table)
 	memcpy(cluster, table, strlen(table) - strlen(fsname));
 	fsname++;
 
-	flags = DLM_LSFL_NEWEXCL;
+	flags = DLM_LSFL_NEWEXCL | DLM_LSFL_SOFTIRQ;
 
 	/*
 	 * create/join lockspace