ceph: add feature bits to connection handshake (protocol change)
Define supported and required feature set. Fail connection if the server
requires features we do not support (TAG_FEATURES), or if the server does
not support features we require.
Signed-off-by: Sage Weil <sage@newdream.net>
diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c
index 506b638..68052f6 100644
--- a/fs/ceph/messenger.c
+++ b/fs/ceph/messenger.c
@@ -631,6 +631,7 @@
dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
con->connect_seq, global_seq, proto);
+ con->out_connect.features = CEPH_FEATURE_SUPPORTED;
con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
con->out_connect.global_seq = cpu_to_le32(global_seq);
@@ -1080,15 +1081,37 @@
return 0;
}
+static void fail_protocol(struct ceph_connection *con)
+{
+ reset_connection(con);
+ set_bit(CLOSED, &con->state); /* in case there's queued work */
+
+ mutex_unlock(&con->mutex);
+ if (con->ops->bad_proto)
+ con->ops->bad_proto(con);
+ mutex_lock(&con->mutex);
+}
+
static int process_connect(struct ceph_connection *con)
{
+ u64 sup_feat = CEPH_FEATURE_SUPPORTED;
+ u64 req_feat = CEPH_FEATURE_REQUIRED;
+ u64 server_feat = le64_to_cpu(con->in_reply.features);
+
dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
switch (con->in_reply.tag) {
+ case CEPH_MSGR_TAG_FEATURES:
+ pr_err("%s%lld %s feature set mismatch,"
+ " my %llx < server's %llx, missing %llx\n",
+ ENTITY_NAME(con->peer_name),
+ pr_addr(&con->peer_addr.in_addr),
+ sup_feat, server_feat, server_feat & ~sup_feat);
+ con->error_msg = "missing required protocol features";
+ fail_protocol(con);
+ return -1;
+
case CEPH_MSGR_TAG_BADPROTOVER:
- dout("process_connect got BADPROTOVER my %d != their %d\n",
- le32_to_cpu(con->out_connect.protocol_version),
- le32_to_cpu(con->in_reply.protocol_version));
pr_err("%s%lld %s protocol version mismatch,"
" my %d != server's %d\n",
ENTITY_NAME(con->peer_name),
@@ -1096,13 +1119,7 @@
le32_to_cpu(con->out_connect.protocol_version),
le32_to_cpu(con->in_reply.protocol_version));
con->error_msg = "protocol version mismatch";
- reset_connection(con);
- set_bit(CLOSED, &con->state); /* in case there's queued work */
-
- mutex_unlock(&con->mutex);
- if (con->ops->bad_proto)
- con->ops->bad_proto(con);
- mutex_lock(&con->mutex);
+ fail_protocol(con);
return -1;
case CEPH_MSGR_TAG_BADAUTHORIZER:
@@ -1173,6 +1190,16 @@
break;
case CEPH_MSGR_TAG_READY:
+ if (req_feat & ~server_feat) {
+ pr_err("%s%lld %s protocol feature mismatch,"
+ " my required %llx > server's %llx, need %llx\n",
+ ENTITY_NAME(con->peer_name),
+ pr_addr(&con->peer_addr.in_addr),
+ req_feat, server_feat, req_feat & ~server_feat);
+ con->error_msg = "missing required protocol features";
+ fail_protocol(con);
+ return -1;
+ }
clear_bit(CONNECTING, &con->state);
con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
con->connect_seq++;