mirror of https://gitee.com/openkylin/linux.git
ceph: separate banner and connect during handshake into distinct stages
We need to make sure we only swab the address during the banner once. So break process_banner out of process_connect, and clean up the surrounding code so that these are distinct phases of the handshake. Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil
parent
685f9a5d14
commit
eed0ef2caf
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@ -564,10 +564,26 @@ static void prepare_write_keepalive(struct ceph_connection *con)
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/*
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* We connected to a peer and are saying hello.
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*/
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static void prepare_write_connect(struct ceph_messenger *msgr,
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static void prepare_write_banner(struct ceph_messenger *msgr,
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struct ceph_connection *con)
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{
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int len = strlen(CEPH_BANNER);
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con->out_kvec[0].iov_base = CEPH_BANNER;
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con->out_kvec[0].iov_len = len;
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con->out_kvec[1].iov_base = &msgr->my_enc_addr;
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con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
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con->out_kvec_left = 2;
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con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
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con->out_kvec_cur = con->out_kvec;
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con->out_more = 0;
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set_bit(WRITE_PENDING, &con->state);
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}
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static void prepare_write_connect(struct ceph_messenger *msgr,
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struct ceph_connection *con,
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int after_banner)
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{
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unsigned global_seq = get_global_seq(con->msgr, 0);
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int proto;
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@ -595,32 +611,14 @@ static void prepare_write_connect(struct ceph_messenger *msgr,
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if (test_bit(LOSSYTX, &con->state))
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con->out_connect.flags = CEPH_MSG_CONNECT_LOSSY;
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con->out_kvec[0].iov_base = CEPH_BANNER;
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con->out_kvec[0].iov_len = len;
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con->out_kvec[1].iov_base = &msgr->my_enc_addr;
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con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
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con->out_kvec[2].iov_base = &con->out_connect;
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con->out_kvec[2].iov_len = sizeof(con->out_connect);
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con->out_kvec_left = 3;
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con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr) +
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sizeof(con->out_connect);
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con->out_kvec_cur = con->out_kvec;
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con->out_more = 0;
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set_bit(WRITE_PENDING, &con->state);
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}
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static void prepare_write_connect_retry(struct ceph_messenger *msgr,
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struct ceph_connection *con)
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{
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dout("prepare_write_connect_retry %p\n", con);
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con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
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con->out_connect.global_seq =
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cpu_to_le32(get_global_seq(con->msgr, 0));
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con->out_kvec[0].iov_base = &con->out_connect;
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con->out_kvec[0].iov_len = sizeof(con->out_connect);
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con->out_kvec_left = 1;
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con->out_kvec_bytes = sizeof(con->out_connect);
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if (!after_banner) {
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con->out_kvec_left = 0;
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con->out_kvec_bytes = 0;
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}
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con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
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con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
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con->out_kvec_left++;
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con->out_kvec_bytes += sizeof(con->out_connect);
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con->out_kvec_cur = con->out_kvec;
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con->out_more = 0;
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set_bit(WRITE_PENDING, &con->state);
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@ -778,6 +776,12 @@ static int write_partial_skip(struct ceph_connection *con)
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/*
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* Prepare to read connection handshake, or an ack.
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*/
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static void prepare_read_banner(struct ceph_connection *con)
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{
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dout("prepare_read_banner %p\n", con);
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con->in_base_pos = 0;
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}
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static void prepare_read_connect(struct ceph_connection *con)
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{
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dout("prepare_read_connect %p\n", con);
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@ -829,11 +833,11 @@ static int read_partial(struct ceph_connection *con,
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/*
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* Read all or part of the connect-side handshake on a new connection
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*/
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static int read_partial_connect(struct ceph_connection *con)
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static int read_partial_banner(struct ceph_connection *con)
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{
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int ret, to = 0;
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dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
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dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
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/* peer's banner */
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ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
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@ -847,6 +851,16 @@ static int read_partial_connect(struct ceph_connection *con)
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&con->peer_addr_for_me);
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if (ret <= 0)
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goto out;
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out:
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return ret;
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}
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static int read_partial_connect(struct ceph_connection *con)
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{
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int ret, to = 0;
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dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
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ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
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if (ret <= 0)
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goto out;
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@ -856,6 +870,7 @@ static int read_partial_connect(struct ceph_connection *con)
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le32_to_cpu(con->in_reply.global_seq));
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out:
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return ret;
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}
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/*
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@ -976,9 +991,9 @@ int ceph_parse_ips(const char *c, const char *end,
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return -EINVAL;
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}
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static int process_connect(struct ceph_connection *con)
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static int process_banner(struct ceph_connection *con)
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{
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dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
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dout("process_banner on %p\n", con);
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if (verify_hello(con) < 0)
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return -1;
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@ -1016,10 +1031,19 @@ static int process_connect(struct ceph_connection *con)
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sizeof(con->peer_addr_for_me.in_addr));
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addr_set_port(&con->msgr->inst.addr.in_addr, port);
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encode_my_addr(con->msgr);
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dout("process_connect learned my addr is %s\n",
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dout("process_banner learned my addr is %s\n",
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pr_addr(&con->msgr->inst.addr.in_addr));
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}
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set_bit(NEGOTIATING, &con->state);
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prepare_read_connect(con);
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return 0;
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}
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static int process_connect(struct ceph_connection *con)
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{
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dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
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switch (con->in_reply.tag) {
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case CEPH_MSGR_TAG_BADPROTOVER:
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dout("process_connect got BADPROTOVER my %d != their %d\n",
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@ -1053,7 +1077,7 @@ static int process_connect(struct ceph_connection *con)
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ENTITY_NAME(con->peer_name),
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pr_addr(&con->peer_addr.in_addr));
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reset_connection(con);
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prepare_write_connect_retry(con->msgr, con);
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prepare_write_connect(con->msgr, con, 0);
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prepare_read_connect(con);
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/* Tell ceph about it. */
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@ -1071,7 +1095,7 @@ static int process_connect(struct ceph_connection *con)
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le32_to_cpu(con->out_connect.connect_seq),
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le32_to_cpu(con->in_connect.connect_seq));
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con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
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prepare_write_connect_retry(con->msgr, con);
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prepare_write_connect(con->msgr, con, 0);
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prepare_read_connect(con);
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break;
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@ -1080,19 +1104,17 @@ static int process_connect(struct ceph_connection *con)
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* If we sent a smaller global_seq than the peer has, try
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* again with a larger value.
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*/
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dout("process_connect got RETRY_GLOBAL my %u, peer_gseq = %u\n",
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dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
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con->peer_global_seq,
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le32_to_cpu(con->in_connect.global_seq));
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get_global_seq(con->msgr,
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le32_to_cpu(con->in_connect.global_seq));
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prepare_write_connect_retry(con->msgr, con);
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prepare_write_connect(con->msgr, con, 0);
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prepare_read_connect(con);
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break;
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case CEPH_MSGR_TAG_READY:
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clear_bit(CONNECTING, &con->state);
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if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
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set_bit(LOSSYRX, &con->state);
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con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
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con->connect_seq++;
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dout("process_connect got READY gseq %d cseq %d (%d)\n",
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@ -1420,9 +1442,11 @@ static int try_write(struct ceph_connection *con)
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if (test_and_clear_bit(STANDBY, &con->state))
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con->connect_seq++;
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prepare_write_connect(msgr, con);
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prepare_read_connect(con);
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prepare_write_banner(msgr, con);
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prepare_write_connect(msgr, con, 1);
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prepare_read_banner(con);
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set_bit(CONNECTING, &con->state);
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clear_bit(NEGOTIATING, &con->state);
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con->in_tag = CEPH_MSGR_TAG_READY;
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dout("try_write initiating connect on %p new state %lu\n",
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@ -1521,7 +1545,16 @@ static int try_read(struct ceph_connection *con)
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dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
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con->in_base_pos);
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if (test_bit(CONNECTING, &con->state)) {
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if (!test_bit(NEGOTIATING, &con->state)) {
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dout("try_read connecting\n");
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ret = read_partial_banner(con);
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if (ret <= 0)
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goto done;
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if (process_banner(con) < 0) {
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ret = -1;
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goto out;
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}
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}
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ret = read_partial_connect(con);
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if (ret <= 0)
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goto done;
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@ -104,8 +104,8 @@ struct ceph_msg_pos {
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* thread is currently opening, reading or writing data to the socket.
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*/
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#define LOSSYTX 0 /* we can close channel or drop messages on errors */
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#define LOSSYRX 1 /* peer may reset/drop messages */
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#define CONNECTING 2
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#define CONNECTING 1
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#define NEGOTIATING 2
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#define KEEPALIVE_PENDING 3
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#define WRITE_PENDING 4 /* we have data ready to send */
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#define QUEUED 5 /* there is work queued on this connection */
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