Commit 7593af92 authored by Alex Elder's avatar Alex Elder Committed by Sage Weil
Browse files

libceph: distinguish two phases of connect sequence 



Currently a ceph connection enters a "CONNECTING" state when it
begins the process of (re-)connecting with its peer.  Once the two
ends have successfully exchanged their banner and addresses, an
additional NEGOTIATING bit is set in the ceph connection's state to
indicate the connection information exhange has begun.  The
CONNECTING bit/state continues to be set during this phase.

Rather than have the CONNECTING state continue while the NEGOTIATING
bit is set, interpret these two phases as distinct states.  In other
words, when NEGOTIATING is set, clear CONNECTING.  That way only
one of them will be active at a time.

Signed-off-by: default avatarAlex Elder <elder@inktank.com>
Reviewed-by: default avatarSage Weil <sage@inktank.com>
parent ab166d5a

net/ceph/messenger.c

+28 −24
Original line number Diff line number Diff line
@@ -1559,7 +1559,6 @@ static int process_connect(struct ceph_connection *con) 
			return -1;

		}

		clear_bit(NEGOTIATING, &con->state);

		clear_bit(CONNECTING, &con->state);

		set_bit(CONNECTED, &con->state);

		con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);

		con->connect_seq++;
@@ -2000,7 +1999,8 @@ more_kvec: 
	}



do_next:

	if (!test_bit(CONNECTING, &con->state)) {

	if (!test_bit(CONNECTING, &con->state) &&

			!test_bit(NEGOTIATING, &con->state)) {

		/* is anything else pending? */

		if (!list_empty(&con->out_queue)) {

			prepare_write_message(con);
@@ -2057,7 +2057,6 @@ more: 
	}



	if (test_bit(CONNECTING, &con->state)) {

		if (!test_bit(NEGOTIATING, &con->state)) {

		dout("try_read connecting\n");

		ret = read_partial_banner(con);

		if (ret <= 0)
@@ -2066,16 +2065,21 @@ more: 
		if (ret < 0)

			goto out;



		clear_bit(CONNECTING, &con->state);

		set_bit(NEGOTIATING, &con->state);



		/* Banner is good, exchange connection info */

		ret = prepare_write_connect(con);

		if (ret < 0)

			goto out;

		prepare_read_connect(con);

			set_bit(NEGOTIATING, &con->state);



		/* Send connection info before awaiting response */

		goto out;

	}



	if (test_bit(NEGOTIATING, &con->state)) {

		dout("try_read negotiating\n");

		ret = read_partial_connect(con);

		if (ret <= 0)

			goto out;
@@ -2197,12 +2201,12 @@ restart: 
	if (test_and_clear_bit(SOCK_CLOSED, &con->flags)) {

		if (test_and_clear_bit(CONNECTED, &con->state))

			con->error_msg = "socket closed";

		else if (test_and_clear_bit(CONNECTING, &con->state)) {

			clear_bit(NEGOTIATING, &con->state);

		else if (test_and_clear_bit(NEGOTIATING, &con->state))

			con->error_msg = "negotiation failed";

		else if (test_and_clear_bit(CONNECTING, &con->state))

			con->error_msg = "connection failed";

		} else {

		else

			con->error_msg = "unrecognized con state";

		}

		goto fault;

	}

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