diff options
Diffstat (limited to 'net/ceph/messenger.c')
| -rw-r--r-- | net/ceph/messenger.c | 937 |
1 files changed, 580 insertions, 357 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c index 10255e81be79..159aa8bef9e7 100644 --- a/net/ceph/messenger.c +++ b/net/ceph/messenger.c @@ -29,6 +29,74 @@ * the sender. */ +/* + * We track the state of the socket on a given connection using + * values defined below. The transition to a new socket state is + * handled by a function which verifies we aren't coming from an + * unexpected state. + * + * -------- + * | NEW* | transient initial state + * -------- + * | con_sock_state_init() + * v + * ---------- + * | CLOSED | initialized, but no socket (and no + * ---------- TCP connection) + * ^ \ + * | \ con_sock_state_connecting() + * | ---------------------- + * | \ + * + con_sock_state_closed() \ + * |+--------------------------- \ + * | \ \ \ + * | ----------- \ \ + * | | CLOSING | socket event; \ \ + * | ----------- await close \ \ + * | ^ \ | + * | | \ | + * | + con_sock_state_closing() \ | + * | / \ | | + * | / --------------- | | + * | / \ v v + * | / -------------- + * | / -----------------| CONNECTING | socket created, TCP + * | | / -------------- connect initiated + * | | | con_sock_state_connected() + * | | v + * ------------- + * | CONNECTED | TCP connection established + * ------------- + * + * State values for ceph_connection->sock_state; NEW is assumed to be 0. + */ + +#define CON_SOCK_STATE_NEW 0 /* -> CLOSED */ +#define CON_SOCK_STATE_CLOSED 1 /* -> CONNECTING */ +#define CON_SOCK_STATE_CONNECTING 2 /* -> CONNECTED or -> CLOSING */ +#define CON_SOCK_STATE_CONNECTED 3 /* -> CLOSING or -> CLOSED */ +#define CON_SOCK_STATE_CLOSING 4 /* -> CLOSED */ + +/* + * connection states + */ +#define CON_STATE_CLOSED 1 /* -> PREOPEN */ +#define CON_STATE_PREOPEN 2 /* -> CONNECTING, CLOSED */ +#define CON_STATE_CONNECTING 3 /* -> NEGOTIATING, CLOSED */ +#define CON_STATE_NEGOTIATING 4 /* -> OPEN, CLOSED */ +#define CON_STATE_OPEN 5 /* -> STANDBY, CLOSED */ +#define CON_STATE_STANDBY 6 /* -> PREOPEN, CLOSED */ + +/* + * ceph_connection flag bits + */ +#define CON_FLAG_LOSSYTX 0 /* we can close channel or drop + * messages on errors */ +#define CON_FLAG_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ +#define CON_FLAG_WRITE_PENDING 2 /* we have data ready to send */ +#define CON_FLAG_SOCK_CLOSED 3 /* socket state changed to closed */ +#define CON_FLAG_BACKOFF 4 /* need to retry queuing delayed work */ + /* static tag bytes (protocol control messages) */ static char tag_msg = CEPH_MSGR_TAG_MSG; static char tag_ack = CEPH_MSGR_TAG_ACK; @@ -147,72 +215,130 @@ void ceph_msgr_flush(void) } EXPORT_SYMBOL(ceph_msgr_flush); +/* Connection socket state transition functions */ + +static void con_sock_state_init(struct ceph_connection *con) +{ + int old_state; + + old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); + if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) + printk("%s: unexpected old state %d\n", __func__, old_state); + dout("%s con %p sock %d -> %d\n", __func__, con, old_state, + CON_SOCK_STATE_CLOSED); +} + +static void con_sock_state_connecting(struct ceph_connection *con) +{ + int old_state; + + old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); + if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) + printk("%s: unexpected old state %d\n", __func__, old_state); + dout("%s con %p sock %d -> %d\n", __func__, con, old_state, + CON_SOCK_STATE_CONNECTING); +} + +static void con_sock_state_connected(struct ceph_connection *con) +{ + int old_state; + + old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); + if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) + printk("%s: unexpected old state %d\n", __func__, old_state); + dout("%s con %p sock %d -> %d\n", __func__, con, old_state, + CON_SOCK_STATE_CONNECTED); +} + +static void con_sock_state_closing(struct ceph_connection *con) +{ + int old_state; + + old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); + if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && + old_state != CON_SOCK_STATE_CONNECTED && + old_state != CON_SOCK_STATE_CLOSING)) + printk("%s: unexpected old state %d\n", __func__, old_state); + dout("%s con %p sock %d -> %d\n", __func__, con, old_state, + CON_SOCK_STATE_CLOSING); +} + +static void con_sock_state_closed(struct ceph_connection *con) +{ + int old_state; + + old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); + if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && + old_state != CON_SOCK_STATE_CLOSING && + old_state != CON_SOCK_STATE_CONNECTING && + old_state != CON_SOCK_STATE_CLOSED)) + printk("%s: unexpected old state %d\n", __func__, old_state); + dout("%s con %p sock %d -> %d\n", __func__, con, old_state, + CON_SOCK_STATE_CLOSED); +} /* * socket callback functions */ /* data available on socket, or listen socket received a connect */ -static void ceph_data_ready(struct sock *sk, int count_unused) +static void ceph_sock_data_ready(struct sock *sk, int count_unused) { struct ceph_connection *con = sk->sk_user_data; + if (atomic_read(&con->msgr->stopping)) { + return; + } if (sk->sk_state != TCP_CLOSE_WAIT) { - dout("ceph_data_ready on %p state = %lu, queueing work\n", + dout("%s on %p state = %lu, queueing work\n", __func__, con, con->state); queue_con(con); } } /* socket has buffer space for writing */ -static void ceph_write_space(struct sock *sk) +static void ceph_sock_write_space(struct sock *sk) { struct ceph_connection *con = sk->sk_user_data; /* only queue to workqueue if there is data we want to write, * and there is sufficient space in the socket buffer to accept - * more data. clear SOCK_NOSPACE so that ceph_write_space() + * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() * doesn't get called again until try_write() fills the socket * buffer. See net/ipv4/tcp_input.c:tcp_check_space() * and net/core/stream.c:sk_stream_write_space(). */ - if (test_bit(WRITE_PENDING, &con->state)) { + if (test_bit(CON_FLAG_WRITE_PENDING, &con->flags)) { if (sk_stream_wspace(sk) >= sk_stream_min_wspace(sk)) { - dout("ceph_write_space %p queueing write work\n", con); + dout("%s %p queueing write work\n", __func__, con); clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); queue_con(con); } } else { - dout("ceph_write_space %p nothing to write\n", con); + dout("%s %p nothing to write\n", __func__, con); } } /* socket's state has changed */ -static void ceph_state_change(struct sock *sk) +static void ceph_sock_state_change(struct sock *sk) { struct ceph_connection *con = sk->sk_user_data; - dout("ceph_state_change %p state = %lu sk_state = %u\n", + dout("%s %p state = %lu sk_state = %u\n", __func__, con, con->state, sk->sk_state); - if (test_bit(CLOSED, &con->state)) - return; - switch (sk->sk_state) { case TCP_CLOSE: - dout("ceph_state_change TCP_CLOSE\n"); + dout("%s TCP_CLOSE\n", __func__); case TCP_CLOSE_WAIT: - dout("ceph_state_change TCP_CLOSE_WAIT\n"); - if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) { - if (test_bit(CONNECTING, &con->state)) - con->error_msg = "connection failed"; - else - con->error_msg = "socket closed"; - queue_con(con); - } + dout("%s TCP_CLOSE_WAIT\n", __func__); + con_sock_state_closing(con); + set_bit(CON_FLAG_SOCK_CLOSED, &con->flags); + queue_con(con); break; case TCP_ESTABLISHED: - dout("ceph_state_change TCP_ESTABLISHED\n"); + dout("%s TCP_ESTABLISHED\n", __func__); + con_sock_state_connected(con); queue_con(con); break; default: /* Everything else is uninteresting */ @@ -228,9 +354,9 @@ static void set_sock_callbacks(struct socket *sock, { struct sock *sk = sock->sk; sk->sk_user_data = con; - sk->sk_data_ready = ceph_data_ready; - sk->sk_write_space = ceph_write_space; - sk->sk_state_change = ceph_state_change; + sk->sk_data_ready = ceph_sock_data_ready; + sk->sk_write_space = ceph_sock_write_space; + sk->sk_state_change = ceph_sock_state_change; } @@ -262,6 +388,7 @@ static int ceph_tcp_connect(struct ceph_connection *con) dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); + con_sock_state_connecting(con); ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), O_NONBLOCK); if (ret == -EINPROGRESS) { @@ -277,7 +404,6 @@ static int ceph_tcp_connect(struct ceph_connection *con) return ret; } con->sock = sock; - return 0; } @@ -333,16 +459,24 @@ static int ceph_tcp_sendpage(struct socket *sock, struct page *page, */ static int con_close_socket(struct ceph_connection *con) { - int rc; + int rc = 0; dout("con_close_socket on %p sock %p\n", con, con->sock); - if (!con->sock) - return 0; - set_bit(SOCK_CLOSED, &con->state); - rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); - sock_release(con->sock); - con->sock = NULL; - clear_bit(SOCK_CLOSED, &con->state); + if (con->sock) { + rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); + sock_release(con->sock); + con->sock = NULL; + } + + /* + * Forcibly clear the SOCK_CLOSED flag. It gets set + * independent of the connection mutex, and we could have + * received a socket close event before we had the chance to + * shut the socket down. + */ + clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags); + + con_sock_state_closed(con); return rc; } @@ -353,6 +487,10 @@ static int con_close_socket(struct ceph_connection *con) static void ceph_msg_remove(struct ceph_msg *msg) { list_del_init(&msg->list_head); + BUG_ON(msg->con == NULL); + msg->con->ops->put(msg->con); + msg->con = NULL; + ceph_msg_put(msg); } static void ceph_msg_remove_list(struct list_head *head) @@ -372,8 +510,11 @@ static void reset_connection(struct ceph_connection *con) ceph_msg_remove_list(&con->out_sent); if (con->in_msg) { + BUG_ON(con->in_msg->con != con); + con->in_msg->con = NULL; ceph_msg_put(con->in_msg); con->in_msg = NULL; + con->ops->put(con); } con->connect_seq = 0; @@ -391,32 +532,44 @@ static void reset_connection(struct ceph_connection *con) */ void ceph_con_close(struct ceph_connection *con) { + mutex_lock(&con->mutex); dout("con_close %p peer %s\n", con, ceph_pr_addr(&con->peer_addr.in_addr)); - set_bit(CLOSED, &con->state); /* in case there's queued work */ - clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */ - clear_bit(LOSSYTX, &con->state); /* so we retry next connect */ - clear_bit(KEEPALIVE_PENDING, &con->state); - clear_bit(WRITE_PENDING, &con->state); - mutex_lock(&con->mutex); + con->state = CON_STATE_CLOSED; + + clear_bit(CON_FLAG_LOSSYTX, &con->flags); /* so we retry next connect */ + clear_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags); + clear_bit(CON_FLAG_WRITE_PENDING, &con->flags); + clear_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags); + clear_bit(CON_FLAG_BACKOFF, &con->flags); + reset_connection(con); con->peer_global_seq = 0; cancel_delayed_work(&con->work); + con_close_socket(con); mutex_unlock(&con->mutex); - queue_con(con); } EXPORT_SYMBOL(ceph_con_close); /* * Reopen a closed connection, with a new peer address. */ -void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr) +void ceph_con_open(struct ceph_connection *con, + __u8 entity_type, __u64 entity_num, + struct ceph_entity_addr *addr) { + mutex_lock(&con->mutex); dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); - set_bit(OPENING, &con->state); - clear_bit(CLOSED, &con->state); + + BUG_ON(con->state != CON_STATE_CLOSED); + con->state = CON_STATE_PREOPEN; + + con->peer_name.type = (__u8) entity_type; + con->peer_name.num = cpu_to_le64(entity_num); + memcpy(&con->peer_addr, addr, sizeof(*addr)); con->delay = 0; /* reset backoff memory */ + mutex_unlock(&con->mutex); queue_con(con); } EXPORT_SYMBOL(ceph_con_open); @@ -430,42 +583,26 @@ bool ceph_con_opened(struct ceph_connection *con) } /* - * generic get/put - */ -struct ceph_connection *ceph_con_get(struct ceph_connection *con) -{ - int nref = __atomic_add_unless(&con->nref, 1, 0); - - dout("con_get %p nref = %d -> %d\n", con, nref, nref + 1); - - return nref ? con : NULL; -} - -void ceph_con_put(struct ceph_connection *con) -{ - int nref = atomic_dec_return(&con->nref); - - BUG_ON(nref < 0); - if (nref == 0) { - BUG_ON(con->sock); - kfree(con); - } - dout("con_put %p nref = %d -> %d\n", con, nref + 1, nref); -} - -/* * initialize a new connection. */ -void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con) +void ceph_con_init(struct ceph_connection *con, void *private, + const struct ceph_connection_operations *ops, + struct ceph_messenger *msgr) { dout("con_init %p\n", con); memset(con, 0, sizeof(*con)); - atomic_set(&con->nref, 1); + con->private = private; + con->ops = ops; con->msgr = msgr; + + con_sock_state_init(con); + mutex_init(&con->mutex); INIT_LIST_HEAD(&con->out_queue); INIT_LIST_HEAD(&con->out_sent); INIT_DELAYED_WORK(&con->work, con_work); + + con->state = CON_STATE_CLOSED; } EXPORT_SYMBOL(ceph_con_init); @@ -486,14 +623,14 @@ static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) return ret; } -static void ceph_con_out_kvec_reset(struct ceph_connection *con) +static void con_out_kvec_reset(struct ceph_connection *con) { con->out_kvec_left = 0; con->out_kvec_bytes = 0; con->out_kvec_cur = &con->out_kvec[0]; } -static void ceph_con_out_kvec_add(struct ceph_connection *con, +static void con_out_kvec_add(struct ceph_connection *con, size_t size, void *data) { int index; @@ -507,6 +644,53 @@ static void ceph_con_out_kvec_add(struct ceph_connection *con, con->out_kvec_bytes += size; } +#ifdef CONFIG_BLOCK +static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg) +{ + if (!bio) { + *iter = NULL; + *seg = 0; + return; + } + *iter = bio; + *seg = bio->bi_idx; +} + +static void iter_bio_next(struct bio **bio_iter, int *seg) +{ + if (*bio_iter == NULL) + return; + + BUG_ON(*seg >= (*bio_iter)->bi_vcnt); + + (*seg)++; + if (*seg == (*bio_iter)->bi_vcnt) + init_bio_iter((*bio_iter)->bi_next, bio_iter, seg); +} +#endif + +static void prepare_write_message_data(struct ceph_connection *con) +{ + struct ceph_msg *msg = con->out_msg; + + BUG_ON(!msg); + BUG_ON(!msg->hdr.data_len); + + /* initialize page iterator */ + con->out_msg_pos.page = 0; + if (msg->pages) + con->out_msg_pos.page_pos = msg->page_alignment; + else + con->out_msg_pos.page_pos = 0; +#ifdef CONFIG_BLOCK + if (msg->bio) + init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); +#endif + con->out_msg_pos.data_pos = 0; + con->out_msg_pos.did_page_crc = false; + con->out_more = 1; /* data + footer will follow */ +} + /* * Prepare footer for currently outgoing message, and finish things * off. Assumes out_kvec* are already valid.. we just add on to the end. @@ -516,6 +700,8 @@ static void prepare_write_message_footer(struct ceph_connection *con) struct ceph_msg *m = con->out_msg; int v = con->out_kvec_left; + m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; + dout("prepare_write_message_footer %p\n", con); con->out_kvec_is_msg = true; con->out_kvec[v].iov_base = &m->footer; @@ -534,7 +720,7 @@ static void prepare_write_message(struct ceph_connection *con) struct ceph_msg *m; u32 crc; - ceph_con_out_kvec_reset(con); + con_out_kvec_reset(con); con->out_kvec_is_msg = true; con->out_msg_done = false; @@ -542,14 +728,16 @@ static void prepare_write_message(struct ceph_connection *con) * TCP packet that's a good thing. */ if (con->in_seq > con->in_seq_acked) { con->in_seq_acked = con->in_seq; - ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); + con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); con->out_temp_ack = cpu_to_le64(con->in_seq_acked); - ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack), + con_out_kvec_add(con, sizeof (con->out_temp_ack), &con->out_temp_ack); } + BUG_ON(list_empty(&con->out_queue)); m = list_first_entry(&con->out_queue, struct ceph_msg, list_head); con->out_msg = m; + BUG_ON(m->con != con); /* put message on sent list */ ceph_msg_get(m); @@ -576,18 +764,18 @@ static void prepare_write_message(struct ceph_connection *con) BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len); /* tag + hdr + front + middle */ - ceph_con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); - ceph_con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); - ceph_con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); + con_out_kvec_add(con, sizeof (tag_msg), &tag_msg); + con_out_kvec_add(con, sizeof (m->hdr), &m->hdr); + con_out_kvec_add(con, m->front.iov_len, m->front.iov_base); if (m->middle) - ceph_con_out_kvec_add(con, m->middle->vec.iov_len, + con_out_kvec_add(con, m->middle->vec.iov_len, m->middle->vec.iov_base); /* fill in crc (except data pages), footer */ crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); con->out_msg->hdr.crc = cpu_to_le32(crc); - con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE; + con->out_msg->footer.flags = 0; crc = crc32c(0, m->front.iov_base, m->front.iov_len); con->out_msg->footer.front_crc = cpu_to_le32(crc); @@ -597,28 +785,19 @@ static void prepare_write_message(struct ceph_connection *con) con->out_msg->footer.middle_crc = cpu_to_le32(crc); } else con->out_msg->footer.middle_crc = 0; - con->out_msg->footer.data_crc = 0; - dout("prepare_write_message front_crc %u data_crc %u\n", + dout("%s front_crc %u middle_crc %u\n", __func__, le32_to_cpu(con->out_msg->footer.front_crc), le32_to_cpu(con->out_msg->footer.middle_crc)); /* is there a data payload? */ - if (le32_to_cpu(m->hdr.data_len) > 0) { - /* initialize page iterator */ - con->out_msg_pos.page = 0; - if (m->pages) - con->out_msg_pos.page_pos = m->page_alignment; - else - con->out_msg_pos.page_pos = 0; - con->out_msg_pos.data_pos = 0; - con->out_msg_pos.did_page_crc = false; - con->out_more = 1; /* data + footer will follow */ - } else { + con->out_msg->footer.data_crc = 0; + if (m->hdr.data_len) + prepare_write_message_data(con); + else /* no, queue up footer too and be done */ prepare_write_message_footer(con); - } - set_bit(WRITE_PENDING, &con->state); + set_bit(CON_FLAG_WRITE_PENDING, &con->flags); } /* @@ -630,16 +809,16 @@ static void prepare_write_ack(struct ceph_connection *con) con->in_seq_acked, con->in_seq); con->in_seq_acked = con->in_seq; - ceph_con_out_kvec_reset(con); + con_out_kvec_reset(con); - ceph_con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); + con_out_kvec_add(con, sizeof (tag_ack), &tag_ack); con->out_temp_ack = cpu_to_le64(con->in_seq_acked); - ceph_con_out_kvec_add(con, sizeof (con->out_temp_ack), + con_out_kvec_add(con, sizeof (con->out_temp_ack), &con->out_temp_ack); con->out_more = 1; /* more will follow.. eventually.. */ - set_bit(WRITE_PENDING, &con->state); + set_bit(CON_FLAG_WRITE_PENDING, &con->flags); } /* @@ -648,9 +827,9 @@ static void prepare_write_ack(struct ceph_connection *con) static void prepare_write_keepalive(struct ceph_connection *con) { dout("prepare_write_keepalive %p\n", con); - ceph_con_out_kvec_reset(con); - ceph_con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); - set_bit(WRITE_PENDING, &con->state); + con_out_kvec_reset(con); + con_out_kvec_add(con, sizeof (tag_keepalive), &tag_keepalive); + set_bit(CON_FLAG_WRITE_PENDING, &con->flags); } /* @@ -665,27 +844,21 @@ static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection if (!con->ops->get_authorizer) { con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN; con->out_connect.authorizer_len = 0; - return NULL; } /* Can't hold the mutex while getting authorizer */ - mutex_unlock(&con->mutex); - auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); - mutex_lock(&con->mutex); if (IS_ERR(auth)) return auth; - if (test_bit(CLOSED, &con->state) || test_bit(OPENING, &con->state)) + if (con->state != CON_STATE_NEGOTIATING) return ERR_PTR(-EAGAIN); con->auth_reply_buf = auth->authorizer_reply_buf; con->auth_reply_buf_len = auth->authorizer_reply_buf_len; - - return auth; } @@ -694,12 +867,12 @@ static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection */ static void prepare_write_banner(struct ceph_connection *con) { - ceph_con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); - ceph_con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), + con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER); + con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr), &con->msgr->my_enc_addr); con->out_more = 0; - set_bit(WRITE_PENDING, &con->state); + set_bit(CON_FLAG_WRITE_PENDING, &con->flags); } static int prepare_write_connect(struct ceph_connection *con) @@ -742,14 +915,14 @@ static int prepare_write_connect(struct ceph_connection *con) con->out_connect.authorizer_len = auth ? cpu_to_le32(auth->authorizer_buf_len) : 0; - ceph_con_out_kvec_add(con, sizeof (con->out_connect), + con_out_kvec_add(con, sizeof (con->out_connect), &con->out_connect); if (auth && auth->authorizer_buf_len) - ceph_con_out_kvec_add(con, auth->authorizer_buf_len, + con_out_kvec_add(con, auth->authorizer_buf_len, auth->authorizer_buf); con->out_more = 0; - set_bit(WRITE_PENDING, &con->state); + set_bit(CON_FLAG_WRITE_PENDING, &con->flags); return 0; } @@ -797,30 +970,34 @@ out: return ret; /* done! */ } -#ifdef CONFIG_BLOCK -static void init_bio_iter(struct bio *bio, struct bio **iter, int *seg) +static void out_msg_pos_next(struct ceph_connection *con, struct page *page, + size_t len, size_t sent, bool in_trail) { - if (!bio) { - *iter = NULL; - *seg = 0; - return; - } - *iter = bio; - *seg = bio->bi_idx; -} + struct ceph_msg *msg = con->out_msg; -static void iter_bio_next(struct bio **bio_iter, int *seg) -{ - if (*bio_iter == NULL) - return; + BUG_ON(!msg); + BUG_ON(!sent); - BUG_ON(*seg >= (*bio_iter)->bi_vcnt); + con->out_msg_pos.data_pos += sent; + con->out_msg_pos.page_pos += sent; + if (sent < len) + return; - (*seg)++; - if (*seg == (*bio_iter)->bi_vcnt) - init_bio_iter((*bio_iter)->bi_next, bio_iter, seg); -} + BUG_ON(sent != len); + con->out_msg_pos.page_pos = 0; + con->out_msg_pos.page++; + con->out_msg_pos.did_page_crc = false; + if (in_trail) + list_move_tail(&page->lru, + &msg->trail->head); + else if (msg->pagelist) + list_move_tail(&page->lru, + &msg->pagelist->head); +#ifdef CONFIG_BLOCK + else if (msg->bio) + iter_bio_next(&msg->bio_iter, &msg->bio_seg); #endif +} /* * Write as much message data payload as we can. If we finish, queue @@ -837,41 +1014,36 @@ static int write_partial_msg_pages(struct ceph_connection *con) bool do_datacrc = !con->msgr->nocrc; int ret; int total_max_write; - int in_trail = 0; - size_t trail_len = (msg->trail ? msg->trail->length : 0); + bool in_trail = false; + const size_t trail_len = (msg->trail ? msg->trail->length : 0); + const size_t trail_off = data_len - trail_len; dout("write_partial_msg_pages %p msg %p page %d/%d offset %d\n", - con, con->out_msg, con->out_msg_pos.page, con->out_msg->nr_pages, + con, msg, con->out_msg_pos.page, msg->nr_pages, con->out_msg_pos.page_pos); -#ifdef CONFIG_BLOCK - if (msg->bio && !msg->bio_iter) - init_bio_iter(msg->bio, &msg->bio_iter, &msg->bio_seg); -#endif - + /* + * Iterate through each page that contains data to be + * written, and send as much as possible for each. + * + * If we are calculating the data crc (the default), we will + * need to map the page. If we have no pages, they have + * been revoked, so use the zero page. + */ while (data_len > con->out_msg_pos.data_pos) { struct page *page = NULL; int max_write = PAGE_SIZE; int bio_offset = 0; - total_max_write = data_len - trail_len - - con->out_msg_pos.data_pos; - - /* - * if we are calculating the data crc (the default), we need - * to map the page. if our pages[] has been revoked, use the - * zero page. - */ - - /* have we reached the trail part of the data? */ - if (con->out_msg_pos.data_pos >= data_len - trail_len) { - in_trail = 1; + in_trail = in_trail || con->out_msg_pos.data_pos >= trail_off; + if (!in_trail) + total_max_write = trail_off - con->out_msg_pos.data_pos; + if (in_trail) { total_max_write = data_len - con->out_msg_pos.data_pos; page = list_first_entry(&msg->trail->head, struct page, lru); - max_write = PAGE_SIZE; } else if (msg->pages) { page = msg->pages[con->out_msg_pos.page]; } else if (msg->pagelist) { @@ -894,52 +1066,32 @@ static int write_partial_msg_pages(struct ceph_connection *con) if (do_datacrc && !con->out_msg_pos.did_page_crc) { void *base; - u32 crc; - u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc); + u32 crc = le32_to_cpu(msg->footer.data_crc); char *kaddr; kaddr = kmap(page); BUG_ON(kaddr == NULL); base = kaddr + con->out_msg_pos.page_pos + bio_offset; - crc = crc32c(tmpcrc, base, len); - con->out_msg->footer.data_crc = cpu_to_le32(crc); + crc = crc32c(crc, base, len); + kunmap(page); + msg->footer.data_crc = cpu_to_le32(crc); con->out_msg_pos.did_page_crc = true; } ret = ceph_tcp_sendpage(con->sock, page, con->out_msg_pos.page_pos + bio_offset, len, 1); - - if (do_datacrc) - kunmap(page); - if (ret <= 0) goto out; - con->out_msg_pos.data_pos += ret; - con->out_msg_pos.page_pos += ret; - if (ret == len) { - con->out_msg_pos.page_pos = 0; - con->out_msg_pos.page++; - con->out_msg_pos.did_page_crc = false; - if (in_trail) - list_move_tail(&page->lru, - &msg->trail->head); - else if (msg->pagelist) - list_move_tail(&page->lru, - &msg->pagelist->head); -#ifdef CONFIG_BLOCK - else if (msg->bio) - iter_bio_next(&msg->bio_iter, &msg->bio_seg); -#endif - } + out_msg_pos_next(con, page, len, (size_t) ret, in_trail); } dout("write_partial_msg_pages %p msg %p done\n", con, msg); /* prepare and queue up footer, too */ if (!do_datacrc) - con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; - ceph_con_out_kvec_reset(con); + msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC; + con_out_kvec_reset(con); prepare_write_message_footer(con); ret = 1; out: @@ -1351,20 +1503,14 @@ static int process_banner(struct ceph_connection *con) ceph_pr_addr(&con->msgr->inst.addr.in_addr)); } - set_bit(NEGOTIATING, &con->state); - prepare_read_connect(con); 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); + BUG_ON(con->state != CON_STATE_NEGOTIATING); + con->state = CON_STATE_CLOSED; } static int process_connect(struct ceph_connection *con) @@ -1407,7 +1553,7 @@ static int process_connect(struct ceph_connection *con) return -1; } con->auth_retry = 1; - ceph_con_out_kvec_reset(con); + con_out_kvec_reset(con); ret = prepare_write_connect(con); if (ret < 0) return ret; @@ -1428,7 +1574,7 @@ static int process_connect(struct ceph_connection *con) ENTITY_NAME(con->peer_name), ceph_pr_addr(&con->peer_addr.in_addr)); reset_connection(con); - ceph_con_out_kvec_reset(con); + con_out_kvec_reset(con); ret = prepare_write_connect(con); if (ret < 0) return ret; @@ -1440,8 +1586,7 @@ static int process_connect(struct ceph_connection *con) if (con->ops->peer_reset) con->ops->peer_reset(con); mutex_lock(&con->mutex); - if (test_bit(CLOSED, &con->state) || - test_bit(OPENING, &con->state)) + if (con->state != CON_STATE_NEGOTIATING) return -EAGAIN; break; @@ -1454,7 +1599,7 @@ static int process_connect(struct ceph_connection *con) le32_to_cpu(con->out_connect.connect_seq), le32_to_cpu(con->in_reply.connect_seq)); con->connect_seq = le32_to_cpu(con->in_reply.connect_seq); - ceph_con_out_kvec_reset(con); + con_out_kvec_reset(con); ret = prepare_write_connect(con); if (ret < 0) return ret; @@ -1471,7 +1616,7 @@ static int process_connect(struct ceph_connection *con) le32_to_cpu(con->in_reply.global_seq)); get_global_seq(con->msgr, le32_to_cpu(con->in_reply.global_seq)); - ceph_con_out_kvec_reset(con); + con_out_kvec_reset(con); ret = prepare_write_connect(con); if (ret < 0) return ret; @@ -1489,7 +1634,10 @@ static int process_connect(struct ceph_connection *con) fail_protocol(con); return -1; } - clear_bit(CONNECTING, &con->state); + + BUG_ON(con->state != CON_STATE_NEGOTIATING); + con->state = CON_STATE_OPEN; + con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq); con->connect_seq++; con->peer_features = server_feat; @@ -1501,7 +1649,9 @@ static int process_connect(struct ceph_connection *con) le32_to_cpu(con->in_reply.connect_seq)); if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY) - set_bit(LOSSYTX, &con->state); + set_bit(CON_FLAG_LOSSYTX, &con->flags); + + con->delay = 0; /* reset backoff memory */ prepare_read_tag(con); break; @@ -1587,10 +1737,7 @@ static int read_partial_message_section(struct ceph_connection *con, return 1; } -static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, - struct ceph_msg_header *hdr, - int *skip); - +static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip); static int read_partial_message_pages(struct ceph_connection *con, struct page **pages, @@ -1633,9 +1780,6 @@ static int read_partial_message_bio(struct ceph_connection *con, void *p; int ret, left; - if (IS_ERR(bv)) - return PTR_ERR(bv); - left = min((int)(data_len - con->in_msg_pos.data_pos), (int)(bv->bv_len - con->in_msg_pos.page_pos)); @@ -1672,7 +1816,6 @@ static int read_partial_message(struct ceph_connection *con) int ret; unsigned int front_len, middle_len, data_len; bool do_datacrc = !con->msgr->nocrc; - int skip; u64 seq; u32 crc; @@ -1723,10 +1866,13 @@ static int read_partial_message(struct ceph_connection *con) /* allocate message? */ if (!con->in_msg) { + int skip = 0; + dout("got hdr type %d front %d data %d\n", con->in_hdr.type, con->in_hdr.front_len, con->in_hdr.data_len); - skip = 0; - con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip); + ret = ceph_con_in_msg_alloc(con, &skip); + if (ret < 0) + return ret; if (skip) { /* skip this message */ dout("alloc_msg said skip message\n"); @@ -1737,11 +1883,9 @@ static int read_partial_message(struct ceph_connection *con) con->in_seq++; return 0; } - if (!con->in_msg) { - con->error_msg = - "error allocating memory for incoming message"; - return -ENOMEM; - } + + BUG_ON(!con->in_msg); + BUG_ON(con->in_msg->con != con); m = con->in_msg; m->front.iov_len = 0; /* haven't read it yet */ if (m->middle) @@ -1753,6 +1897,11 @@ static int read_partial_message(struct ceph_connection *con) else con->in_msg_pos.page_pos = 0; con->in_msg_pos.data_pos = 0; + +#ifdef CONFIG_BLOCK + if (m->bio) + init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); +#endif } /* front */ @@ -1769,10 +1918,6 @@ static int read_partial_message(struct ceph_connection *con) if (ret <= 0) return ret; } -#ifdef CONFIG_BLOCK - if (m->bio && !m->bio_iter) - init_bio_iter(m->bio, &m->bio_iter, &m->bio_seg); -#endif /* (page) data */ while (con->in_msg_pos.data_pos < data_len) { @@ -1783,7 +1928,7 @@ static int read_partial_message(struct ceph_connection *con) return ret; #ifdef CONFIG_BLOCK } else if (m->bio) { - + BUG_ON(!m->bio_iter); ret = read_partial_message_bio(con, &m->bio_iter, &m->bio_seg, data_len, do_datacrc); @@ -1837,8 +1982,11 @@ static void process_message(struct ceph_connection *con) { struct ceph_msg *msg; + BUG_ON(con->in_msg->con != con); + con->in_msg->con = NULL; msg = con->in_msg; con->in_msg = NULL; + con->ops->put(con); /* if first message, set peer_name */ if (con->peer_name.type == 0) @@ -1858,7 +2006,6 @@ static void process_message(struct ceph_connection *con) con->ops->dispatch(con, msg); mutex_lock(&con->mutex); - prepare_read_tag(con); } @@ -1870,22 +2017,19 @@ static int try_write(struct ceph_connection *con) { int ret = 1; - dout("try_write start %p state %lu nref %d\n", con, con->state, - atomic_read(&con->nref)); + dout("try_write start %p state %lu\n", con, con->state); more: dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes); /* open the socket first? */ - if (con->sock == NULL) { - ceph_con_out_kvec_reset(con); + if (con->state == CON_STATE_PREOPEN) { + BUG_ON(con->sock); + con->state = CON_STATE_CONNECTING; + + con_out_kvec_reset(con); prepare_write_banner(con); - ret = prepare_write_connect(con); - if (ret < 0) - goto out; prepare_read_banner(con); - set_bit(CONNECTING, &con->state); - clear_bit(NEGOTIATING, &con->state); BUG_ON(con->in_msg); con->in_tag = CEPH_MSGR_TAG_READY; @@ -1932,7 +2076,7 @@ more_kvec: } do_next: - if (!test_bit(CONNECTING, &con->state)) { + if (con->state == CON_STATE_OPEN) { /* is anything else pending? */ if (!list_empty(&con->out_queue)) { prepare_write_message(con); @@ -1942,14 +2086,15 @@ do_next: prepare_write_ack(con); goto more; } - if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) { + if (test_and_clear_bit(CON_FLAG_KEEPALIVE_PENDING, + &con->flags)) { prepare_write_keepalive(con); goto more; } } /* Nothing to do! */ - clear_bit(WRITE_PENDING, &con->state); + clear_bit(CON_FLAG_WRITE_PENDING, &con->flags); dout("try_write nothing else to write.\n"); ret = 0; out: @@ -1966,38 +2111,46 @@ static int try_read(struct ceph_connection *con) { int ret = -1; - if (!con->sock) - return 0; - - if (test_bit(STANDBY, &con->state)) +more: + dout("try_read start on %p state %lu\n", con, con->state); + if (con->state != CON_STATE_CONNECTING && + con->state != CON_STATE_NEGOTIATING && + con->state != CON_STATE_OPEN) return 0; - dout("try_read start on %p\n", con); + BUG_ON(!con->sock); -more: dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag, con->in_base_pos); - /* - * process_connect and process_message drop and re-take - * con->mutex. make sure we handle a racing close or reopen. - */ - if (test_bit(CLOSED, &con->state) || - test_bit(OPENING, &con->state)) { - ret = -EAGAIN; + if (con->state == CON_STATE_CONNECTING) { + dout("try_read connecting\n"); + ret = read_partial_banner(con); + if (ret <= 0) + goto out; + ret = process_banner(con); + if (ret < 0) + goto out; + + BUG_ON(con->state != CON_STATE_CONNECTING); + con->state = CON_STATE_NEGOTIATING; + + /* + * Received banner is good, exchange connection info. + * Do not reset out_kvec, as sending our banner raced + * with receiving peer banner after connect completed. + */ + ret = prepare_write_connect(con); + if (ret < 0) + goto out; + prepare_read_connect(con); + + /* Send connection info before awaiting response */ goto out; } - 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) - goto out; - ret = process_banner(con); - if (ret < 0) - goto out; - } + if (con->state == CON_STATE_NEGOTIATING) { + dout("try_read negotiating\n"); ret = read_partial_connect(con); if (ret <= 0) goto out; @@ -2007,6 +2160,8 @@ more: goto more; } + BUG_ON(con->state != CON_STATE_OPEN); + if (con->in_base_pos < 0) { /* * skipping + discarding content. @@ -2040,7 +2195,8 @@ more: prepare_read_ack(con); break; case CEPH_MSGR_TAG_CLOSE: - set_bit(CLOSED, &con->state); /* fixme */ + con_close_socket(con); + con->state = CON_STATE_CLOSED; goto out; default: goto bad_tag; @@ -2063,6 +2219,8 @@ more: if (con->in_tag == CEPH_MSGR_TAG_READY) goto more; process_message(con); + if (con->state == CON_STATE_OPEN) + prepare_read_tag(con); goto more; } if (con->in_tag == CEPH_MSGR_TAG_ACK) { @@ -2091,12 +2249,6 @@ bad_tag: */ static void queue_con(struct ceph_connection *con) { - if (test_bit(DEAD, &con->state)) { - dout("queue_con %p ignoring: DEAD\n", - con); - return; - } - if (!con->ops->get(con)) { dout("queue_con %p ref count 0\n", con); return; @@ -2121,7 +2273,26 @@ static void con_work(struct work_struct *work) mutex_lock(&con->mutex); restart: - if (test_and_clear_bit(BACKOFF, &con->state)) { + if (test_and_clear_bit(CON_FLAG_SOCK_CLOSED, &con->flags)) { + switch (con->state) { + case CON_STATE_CONNECTING: + con->error_msg = "connection failed"; + break; + case CON_STATE_NEGOTIATING: + con->error_msg = "negotiation failed"; + break; + case CON_STATE_OPEN: + con->error_msg = "socket closed"; + break; + default: + dout("unrecognized con state %d\n", (int)con->state); + con->error_msg = "unrecognized con state"; + BUG(); + } + goto fault; + } + + if (test_and_clear_bit(CON_FLAG_BACKOFF, &con->flags)) { dout("con_work %p backing off\n", con); if (queue_delayed_work(ceph_msgr_wq, &con->work, round_jiffies_relative(con->delay))) { @@ -2135,35 +2306,35 @@ restart: } } - if (test_bit(STANDBY, &con->state)) { + if (con->state == CON_STATE_STANDBY) { dout("con_work %p STANDBY\n", con); goto done; } - if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */ - dout("con_work CLOSED\n"); - con_close_socket(con); + if (con->state == CON_STATE_CLOSED) { + dout("con_work %p CLOSED\n", con); + BUG_ON(con->sock); goto done; } - if (test_and_clear_bit(OPENING, &con->state)) { - /* reopen w/ new peer */ + if (con->state == CON_STATE_PREOPEN) { dout("con_work OPENING\n"); - con_close_socket(con); + BUG_ON(con->sock); } - if (test_and_clear_bit(SOCK_CLOSED, &con->state)) - goto fault; - ret = try_read(con); if (ret == -EAGAIN) goto restart; - if (ret < 0) + if (ret < 0) { + con->error_msg = "socket error on read"; goto fault; + } ret = try_write(con); if (ret == -EAGAIN) goto restart; - if (ret < 0) + if (ret < 0) { + con->error_msg = "socket error on write"; goto fault; + } done: mutex_unlock(&con->mutex); @@ -2172,7 +2343,6 @@ done_unlocked: return; fault: - mutex_unlock(&con->mutex); ceph_fault(con); /* error/fault path */ goto done_unlocked; } @@ -2183,26 +2353,31 @@ fault: * exponential backoff */ static void ceph_fault(struct ceph_connection *con) + __releases(con->mutex) { pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg); dout("fault %p state %lu to peer %s\n", con, con->state, ceph_pr_addr(&con->peer_addr.in_addr)); - if (test_bit(LOSSYTX, &con->state)) { - dout("fault on LOSSYTX channel\n"); - goto out; - } - - mutex_lock(&con->mutex); - if (test_bit(CLOSED, &con->state)) - goto out_unlock; + BUG_ON(con->state != CON_STATE_CONNECTING && + con->state != CON_STATE_NEGOTIATING && + con->state != CON_STATE_OPEN); con_close_socket(con); + if (test_bit(CON_FLAG_LOSSYTX, &con->flags)) { + dout("fault on LOSSYTX channel, marking CLOSED\n"); + con->state = CON_STATE_CLOSED; + goto out_unlock; + } + if (con->in_msg) { + BUG_ON(con->in_msg->con != con); + con->in_msg->con = NULL; ceph_msg_put(con->in_msg); con->in_msg = NULL; + con->ops->put(con); } /* Requeue anything that hasn't been acked */ @@ -2211,12 +2386,13 @@ static void ceph_fault(struct ceph_connection *con) /* If there are no messages queued or keepalive pending, place * the connection in a STANDBY state */ if (list_empty(&con->out_queue) && - !test_bit(KEEPALIVE_PENDING, &con->state)) { + !test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags)) { dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); - clear_bit(WRITE_PENDING, &con->state); - set_bit(STANDBY, &con->state); + clear_bit(CON_FLAG_WRITE_PENDING, &con->flags); + con->state = CON_STATE_STANDBY; } else { /* retry after a delay. */ + con->state = CON_STATE_PREOPEN; if (con->delay == 0) con->delay = BASE_DELAY_INTERVAL; else if (con->delay < MAX_DELAY_INTERVAL) @@ -2237,13 +2413,12 @@ static void ceph_fault(struct ceph_connection *con) * that when con_work restarts we schedule the * delay then. */ - set_bit(BACKOFF, &con->state); + set_bit(CON_FLAG_BACKOFF, &con->flags); } } out_unlock: mutex_unlock(&con->mutex); -out: /* * in case we faulted due to authentication, invalidate our * current tickets so that we can get new ones. @@ -2260,18 +2435,14 @@ out: /* - * create a new messenger instance + * initialize a new messenger instance */ -struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr, - u32 supported_features, - u32 required_features) +void ceph_messenger_init(struct ceph_messenger *msgr, + struct ceph_entity_addr *myaddr, + u32 supported_features, + u32 required_features, + bool nocrc) { - struct ceph_messenger *msgr; - - msgr = kzalloc(sizeof(*msgr), GFP_KERNEL); - if (msgr == NULL) - return ERR_PTR(-ENOMEM); - msgr->supported_features = supported_features; msgr->required_features = required_features; @@ -2284,30 +2455,23 @@ struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr, msgr->inst.addr.type = 0; get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce)); encode_my_addr(msgr); + msgr->nocrc = nocrc; - dout("messenger_create %p\n", msgr); - return msgr; -} -EXPORT_SYMBOL(ceph_messenger_create); + atomic_set(&msgr->stopping, 0); -void ceph_messenger_destroy(struct ceph_messenger *msgr) -{ - dout("destroy %p\n", msgr); - kfree(msgr); - dout("destroyed messenger %p\n", msgr); + dout("%s %p\n", __func__, msgr); } -EXPORT_SYMBOL(ceph_messenger_destroy); +EXPORT_SYMBOL(ceph_messenger_init); static void clear_standby(struct ceph_connection *con) { /* come back from STANDBY? */ - if (test_and_clear_bit(STANDBY, &con->state)) { - mutex_lock(&con->mutex); + if (con->state == CON_STATE_STANDBY) { dout("clear_standby %p and ++connect_seq\n", con); + con->state = CON_STATE_PREOPEN; con->connect_seq++; - WARN_ON(test_bit(WRITE_PENDING, &con->state)); - WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state)); - mutex_unlock(&con->mutex); + WARN_ON(test_bit(CON_FLAG_WRITE_PENDING, &con->flags)); + WARN_ON(test_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags)); } } @@ -2316,21 +2480,24 @@ static void clear_standby(struct ceph_connection *con) */ void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) { - if (test_bit(CLOSED, &con->state)) { - dout("con_send %p closed, dropping %p\n", con, msg); - ceph_msg_put(msg); - return; - } - /* set src+dst */ msg->hdr.src = con->msgr->inst.name; - BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len)); - msg->needs_out_seq = true; - /* queue */ mutex_lock(&con->mutex); + + if (con->state == CON_STATE_CLOSED) { + dout("con_send %p closed, dropping %p\n", con, msg); + ceph_msg_put(msg); + mutex_unlock(&con->mutex); + return; + } + + BUG_ON(msg->con != NULL); + msg->con = con->ops->get(con); + BUG_ON(msg->con == NULL); + BUG_ON(!list_empty(&msg->list_head)); list_add_tail(&msg->list_head, &con->out_queue); dout("----- %p to %s%lld %d=%s len %d+%d+%d -----\n", msg, @@ -2339,12 +2506,13 @@ void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg) le32_to_cpu(msg->hdr.front_len), le32_to_cpu(msg->hdr.middle_len), le32_to_cpu(msg->hdr.data_len)); + + clear_standby(con); mutex_unlock(&con->mutex); /* if there wasn't anything waiting to send before, queue * new work */ - clear_standby(con); - if (test_and_set_bit(WRITE_PENDING, &con->state) == 0) + if (test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0) queue_con(con); } EXPORT_SYMBOL(ceph_con_send); @@ -2352,24 +2520,34 @@ EXPORT_SYMBOL(ceph_con_send); /* * Revoke a message that was previously queued for send */ -void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) +void ceph_msg_revoke(struct ceph_msg *msg) { + struct ceph_connection *con = msg->con; + + if (!con) + return; /* Message not in our possession */ + mutex_lock(&con->mutex); if (!list_empty(&msg->list_head)) { - dout("con_revoke %p msg %p - was on queue\n", con, msg); + dout("%s %p msg %p - was on queue\n", __func__, con, msg); list_del_init(&msg->list_head); - ceph_msg_put(msg); + BUG_ON(msg->con == NULL); + msg->con->ops->put(msg->con); + msg->con = NULL; msg->hdr.seq = 0; + + ceph_msg_put(msg); } if (con->out_msg == msg) { - dout("con_revoke %p msg %p - was sending\n", con, msg); + dout("%s %p msg %p - was sending\n", __func__, con, msg); con->out_msg = NULL; if (con->out_kvec_is_msg) { con->out_skip = con->out_kvec_bytes; con->out_kvec_is_msg = false; } - ceph_msg_put(msg); msg->hdr.seq = 0; + + ceph_msg_put(msg); } mutex_unlock(&con->mutex); } @@ -2377,17 +2555,27 @@ void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg) /* * Revoke a message that we may be reading data into */ -void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) +void ceph_msg_revoke_incoming(struct ceph_msg *msg) { + struct ceph_connection *con; + + BUG_ON(msg == NULL); + if (!msg->con) { + dout("%s msg %p null con\n", __func__, msg); + + return; /* Message not in our possession */ + } + + con = msg->con; mutex_lock(&con->mutex); - if (con->in_msg && con->in_msg == msg) { + if (con->in_msg == msg) { unsigned int front_len = le32_to_cpu(con->in_hdr.front_len); unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len); unsigned int data_len = le32_to_cpu(con->in_hdr.data_len); /* skip rest of message */ - dout("con_revoke_pages %p msg %p revoked\n", con, msg); - con->in_base_pos = con->in_base_pos - + dout("%s %p msg %p revoked\n", __func__, con, msg); + con->in_base_pos = con->in_base_pos - sizeof(struct ceph_msg_header) - front_len - middle_len - @@ -2398,8 +2586,8 @@ void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) con->in_tag = CEPH_MSGR_TAG_READY; con->in_seq++; } else { - dout("con_revoke_pages %p msg %p pages %p no-op\n", - con, con->in_msg, msg); + dout("%s %p in_msg %p msg %p no-op\n", + __func__, con, con->in_msg, msg); } mutex_unlock(&con->mutex); } @@ -2410,9 +2598,11 @@ void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg) void ceph_con_keepalive(struct ceph_connection *con) { dout("con_keepalive %p\n", con); + mutex_lock(&con->mutex); clear_standby(con); - if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 && - test_and_set_bit(WRITE_PENDING, &con->state) == 0) + mutex_unlock(&con->mutex); + if (test_and_set_bit(CON_FLAG_KEEPALIVE_PENDING, &con->flags) == 0 && + test_and_set_bit(CON_FLAG_WRITE_PENDING, &con->flags) == 0) queue_con(con); } EXPORT_SYMBOL(ceph_con_keepalive); @@ -2431,6 +2621,8 @@ struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, if (m == NULL) goto out; kref_init(&m->kref); + + m->con = NULL; INIT_LIST_HEAD(&m->list_head); m->hdr.tid = 0; @@ -2526,46 +2718,77 @@ static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg) } /* - * Generic message allocator, for incoming messages. + * Allocate a message for receiving an incoming message on a + * connection, and save the result in con->in_msg. Uses the + * connection's private alloc_msg op if available. + * + * Returns 0 on success, or a negative error code. + * + * On success, if we set *skip = 1: + * - the next message should be skipped and ignored. + * - con->in_msg == NULL + * or if we set *skip = 0: + * - con->in_msg is non-null. + * On error (ENOMEM, EAGAIN, ...), + * - con->in_msg == NULL */ -static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, - struct ceph_msg_header *hdr, - int *skip) +static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip) { + struct ceph_msg_header *hdr = &con->in_hdr; int type = le16_to_cpu(hdr->type); int front_len = le32_to_cpu(hdr->front_len); int middle_len = le32_to_cpu(hdr->middle_len); - struct ceph_msg *msg = NULL; - int ret; + int ret = 0; + + BUG_ON(con->in_msg != NULL); if (con->ops->alloc_msg) { + struct ceph_msg *msg; + mutex_unlock(&con->mutex); msg = con->ops->alloc_msg(con, hdr, skip); mutex_lock(&con->mutex); - if (!msg || *skip) - return NULL; + if (con->state != CON_STATE_OPEN) { + ceph_msg_put(msg); + return -EAGAIN; + } + con->in_msg = msg; + if (con->in_msg) { + con->in_msg->con = con->ops->get(con); + BUG_ON(con->in_msg->con == NULL); + } + if (*skip) { + con->in_msg = NULL; + return 0; + } + if (!con->in_msg) { + con->error_msg = + "error allocating memory for incoming message"; + return -ENOMEM; + } } - if (!msg) { - *skip = 0; - msg = ceph_msg_new(type, front_len, GFP_NOFS, false); - if (!msg) { + if (!con->in_msg) { + con->in_msg = ceph_msg_new(type, front_len, GFP_NOFS, false); + if (!con->in_msg) { pr_err("unable to allocate msg type %d len %d\n", type, front_len); - return NULL; + return -ENOMEM; } - msg->page_alignment = le16_to_cpu(hdr->data_off); + con->in_msg->con = con->ops->get(con); + BUG_ON(con->in_msg->con == NULL); + con->in_msg->page_alignment = le16_to_cpu(hdr->data_off); } - memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); + memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr)); - if (middle_len && !msg->middle) { - ret = ceph_alloc_middle(con, msg); + if (middle_len && !con->in_msg->middle) { + ret = ceph_alloc_middle(con, con->in_msg); if (ret < 0) { - ceph_msg_put(msg); - return NULL; + ceph_msg_put(con->in_msg); + con->in_msg = NULL; } } - return msg; + return ret; } |