From 1faf289454b9eeb6e463da3eee47f7009668370d Mon Sep 17 00:00:00 2001 From: Srinivas Eeda Date: Mon, 29 Jan 2007 15:31:35 -0800 Subject: ocfs2_dlm: disallow a domain join if node maps mismatch There is a small window where a joining node may not see the node(s) that just died but are still part of the domain. To fix this, we must disallow join requests if the joining node has a different node map. A new field node_map is added to dlm_query_join_request to send the current nodes nodemap along with join request. On the receiving end the nodes that are part of the cluster verifies if this new node sees all the nodes that are still part of the cluster. They disallow the join if the maps mismatch. Signed-off-by: Srinivas Eeda Signed-off-by: Mark Fasheh --- fs/ocfs2/dlm/dlmcommon.h | 4 ++++ 1 file changed, 4 insertions(+) (limited to 'fs/ocfs2/dlm/dlmcommon.h') diff --git a/fs/ocfs2/dlm/dlmcommon.h b/fs/ocfs2/dlm/dlmcommon.h index 2f4f5d4edb0..e90b92f9ece 100644 --- a/fs/ocfs2/dlm/dlmcommon.h +++ b/fs/ocfs2/dlm/dlmcommon.h @@ -625,12 +625,16 @@ struct dlm_begin_reco }; +#define BITS_PER_BYTE 8 +#define BITS_TO_BYTES(bits) (((bits)+BITS_PER_BYTE-1)/BITS_PER_BYTE) + struct dlm_query_join_request { u8 node_idx; u8 pad1[2]; u8 name_len; u8 domain[O2NM_MAX_NAME_LEN]; + u8 node_map[BITS_TO_BYTES(O2NM_MAX_NODES)]; }; struct dlm_assert_joined -- cgit v1.2.3