/net/ceph/messenger.c
C | 1982 lines | 1514 code | 246 blank | 222 comment | 259 complexity | ee9ad613c4a453fa97cd535771756746 MD5 | raw file
- #include <linux/ceph/ceph_debug.h>
- #include <linux/crc32c.h>
- #include <linux/ctype.h>
- #include <linux/highmem.h>
- #include <linux/inet.h>
- #include <linux/kthread.h>
- #include <linux/net.h>
- #include <linux/slab.h>
- #include <linux/socket.h>
- #include <linux/string.h>
- #include <linux/bio.h>
- #include <linux/blkdev.h>
- #include <net/tcp.h>
- #include <linux/ceph/libceph.h>
- #include <linux/ceph/messenger.h>
- #include <linux/ceph/decode.h>
- #include <linux/ceph/pagelist.h>
- /*
- * Ceph uses the messenger to exchange ceph_msg messages with other
- * hosts in the system. The messenger provides ordered and reliable
- * delivery. We tolerate TCP disconnects by reconnecting (with
- * exponential backoff) in the case of a fault (disconnection, bad
- * crc, protocol error). Acks allow sent messages to be discarded by
- * the sender.
- */
- /* static tag bytes (protocol control messages) */
- static char tag_msg = CEPH_MSGR_TAG_MSG;
- static char tag_ack = CEPH_MSGR_TAG_ACK;
- static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
- #ifdef CONFIG_LOCKDEP
- static struct lock_class_key socket_class;
- #endif
- static void queue_con(struct ceph_connection *con);
- static void con_work(struct work_struct *);
- static void ceph_fault(struct ceph_connection *con);
- /*
- * nicely render a sockaddr as a string.
- */
- #define MAX_ADDR_STR 20
- #define MAX_ADDR_STR_LEN 60
- static char addr_str[MAX_ADDR_STR][MAX_ADDR_STR_LEN];
- static DEFINE_SPINLOCK(addr_str_lock);
- static int last_addr_str;
- const char *ceph_pr_addr(const struct sockaddr_storage *ss)
- {
- int i;
- char *s;
- struct sockaddr_in *in4 = (void *)ss;
- struct sockaddr_in6 *in6 = (void *)ss;
- spin_lock(&addr_str_lock);
- i = last_addr_str++;
- if (last_addr_str == MAX_ADDR_STR)
- last_addr_str = 0;
- spin_unlock(&addr_str_lock);
- s = addr_str[i];
- switch (ss->ss_family) {
- case AF_INET:
- snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%u", &in4->sin_addr,
- (unsigned int)ntohs(in4->sin_port));
- break;
- case AF_INET6:
- snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%u", &in6->sin6_addr,
- (unsigned int)ntohs(in6->sin6_port));
- break;
- default:
- snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %d)",
- (int)ss->ss_family);
- }
- return s;
- }
- EXPORT_SYMBOL(ceph_pr_addr);
- static void encode_my_addr(struct ceph_messenger *msgr)
- {
- memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
- ceph_encode_addr(&msgr->my_enc_addr);
- }
- /*
- * work queue for all reading and writing to/from the socket.
- */
- struct workqueue_struct *ceph_msgr_wq;
- int ceph_msgr_init(void)
- {
- ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_NON_REENTRANT, 0);
- if (!ceph_msgr_wq) {
- pr_err("msgr_init failed to create workqueue\n");
- return -ENOMEM;
- }
- return 0;
- }
- EXPORT_SYMBOL(ceph_msgr_init);
- void ceph_msgr_exit(void)
- {
- destroy_workqueue(ceph_msgr_wq);
- }
- EXPORT_SYMBOL(ceph_msgr_exit);
- void ceph_msgr_flush(void)
- {
- flush_workqueue(ceph_msgr_wq);
- }
- EXPORT_SYMBOL(ceph_msgr_flush);
- /*
- * socket callback functions
- */
- /* data available on socket, or listen socket received a connect */
- static void ceph_data_ready(struct sock *sk, int count_unused)
- {
- struct ceph_connection *con =
- (struct ceph_connection *)sk->sk_user_data;
- if (sk->sk_state != TCP_CLOSE_WAIT) {
- dout("ceph_data_ready on %p state = %lu, queueing work\n",
- con, con->state);
- queue_con(con);
- }
- }
- /* socket has buffer space for writing */
- static void ceph_write_space(struct sock *sk)
- {
- struct ceph_connection *con =
- (struct ceph_connection *)sk->sk_user_data;
- /* only queue to workqueue if there is data we want to write. */
- if (test_bit(WRITE_PENDING, &con->state)) {
- dout("ceph_write_space %p queueing write work\n", con);
- queue_con(con);
- } else {
- dout("ceph_write_space %p nothing to write\n", con);
- }
- /* since we have our own write_space, clear the SOCK_NOSPACE flag */
- clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
- }
- /* socket's state has changed */
- static void ceph_state_change(struct sock *sk)
- {
- struct ceph_connection *con =
- (struct ceph_connection *)sk->sk_user_data;
- dout("ceph_state_change %p state = %lu sk_state = %u\n",
- 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");
- 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);
- }
- break;
- case TCP_ESTABLISHED:
- dout("ceph_state_change TCP_ESTABLISHED\n");
- queue_con(con);
- break;
- }
- }
- /*
- * set up socket callbacks
- */
- static void set_sock_callbacks(struct socket *sock,
- struct ceph_connection *con)
- {
- struct sock *sk = sock->sk;
- sk->sk_user_data = (void *)con;
- sk->sk_data_ready = ceph_data_ready;
- sk->sk_write_space = ceph_write_space;
- sk->sk_state_change = ceph_state_change;
- }
- /*
- * socket helpers
- */
- /*
- * initiate connection to a remote socket.
- */
- static struct socket *ceph_tcp_connect(struct ceph_connection *con)
- {
- struct sockaddr_storage *paddr = &con->peer_addr.in_addr;
- struct socket *sock;
- int ret;
- BUG_ON(con->sock);
- ret = sock_create_kern(con->peer_addr.in_addr.ss_family, SOCK_STREAM,
- IPPROTO_TCP, &sock);
- if (ret)
- return ERR_PTR(ret);
- con->sock = sock;
- sock->sk->sk_allocation = GFP_NOFS;
- #ifdef CONFIG_LOCKDEP
- lockdep_set_class(&sock->sk->sk_lock, &socket_class);
- #endif
- set_sock_callbacks(sock, con);
- dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr));
- ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr),
- O_NONBLOCK);
- if (ret == -EINPROGRESS) {
- dout("connect %s EINPROGRESS sk_state = %u\n",
- ceph_pr_addr(&con->peer_addr.in_addr),
- sock->sk->sk_state);
- ret = 0;
- }
- if (ret < 0) {
- pr_err("connect %s error %d\n",
- ceph_pr_addr(&con->peer_addr.in_addr), ret);
- sock_release(sock);
- con->sock = NULL;
- con->error_msg = "connect error";
- }
- if (ret < 0)
- return ERR_PTR(ret);
- return sock;
- }
- static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
- {
- struct kvec iov = {buf, len};
- struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
- int r;
- r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
- if (r == -EAGAIN)
- r = 0;
- return r;
- }
- /*
- * write something. @more is true if caller will be sending more data
- * shortly.
- */
- static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
- size_t kvlen, size_t len, int more)
- {
- struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
- int r;
- if (more)
- msg.msg_flags |= MSG_MORE;
- else
- msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
- r = kernel_sendmsg(sock, &msg, iov, kvlen, len);
- if (r == -EAGAIN)
- r = 0;
- return r;
- }
- /*
- * Shutdown/close the socket for the given connection.
- */
- static int con_close_socket(struct ceph_connection *con)
- {
- int rc;
- 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);
- return rc;
- }
- /*
- * Reset a connection. Discard all incoming and outgoing messages
- * and clear *_seq state.
- */
- static void ceph_msg_remove(struct ceph_msg *msg)
- {
- list_del_init(&msg->list_head);
- ceph_msg_put(msg);
- }
- static void ceph_msg_remove_list(struct list_head *head)
- {
- while (!list_empty(head)) {
- struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
- list_head);
- ceph_msg_remove(msg);
- }
- }
- static void reset_connection(struct ceph_connection *con)
- {
- /* reset connection, out_queue, msg_ and connect_seq */
- /* discard existing out_queue and msg_seq */
- ceph_msg_remove_list(&con->out_queue);
- ceph_msg_remove_list(&con->out_sent);
- if (con->in_msg) {
- ceph_msg_put(con->in_msg);
- con->in_msg = NULL;
- }
- con->connect_seq = 0;
- con->out_seq = 0;
- if (con->out_msg) {
- ceph_msg_put(con->out_msg);
- con->out_msg = NULL;
- }
- con->in_seq = 0;
- con->in_seq_acked = 0;
- }
- /*
- * mark a peer down. drop any open connections.
- */
- void ceph_con_close(struct ceph_connection *con)
- {
- 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);
- reset_connection(con);
- con->peer_global_seq = 0;
- cancel_delayed_work(&con->work);
- 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)
- {
- dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr));
- set_bit(OPENING, &con->state);
- clear_bit(CLOSED, &con->state);
- memcpy(&con->peer_addr, addr, sizeof(*addr));
- con->delay = 0; /* reset backoff memory */
- queue_con(con);
- }
- EXPORT_SYMBOL(ceph_con_open);
- /*
- * return true if this connection ever successfully opened
- */
- bool ceph_con_opened(struct ceph_connection *con)
- {
- return con->connect_seq > 0;
- }
- /*
- * generic get/put
- */
- struct ceph_connection *ceph_con_get(struct ceph_connection *con)
- {
- dout("con_get %p nref = %d -> %d\n", con,
- atomic_read(&con->nref), atomic_read(&con->nref) + 1);
- if (atomic_inc_not_zero(&con->nref))
- return con;
- return NULL;
- }
- void ceph_con_put(struct ceph_connection *con)
- {
- dout("con_put %p nref = %d -> %d\n", con,
- atomic_read(&con->nref), atomic_read(&con->nref) - 1);
- BUG_ON(atomic_read(&con->nref) == 0);
- if (atomic_dec_and_test(&con->nref)) {
- BUG_ON(con->sock);
- kfree(con);
- }
- }
- /*
- * initialize a new connection.
- */
- void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
- {
- dout("con_init %p\n", con);
- memset(con, 0, sizeof(*con));
- atomic_set(&con->nref, 1);
- con->msgr = msgr;
- mutex_init(&con->mutex);
- INIT_LIST_HEAD(&con->out_queue);
- INIT_LIST_HEAD(&con->out_sent);
- INIT_DELAYED_WORK(&con->work, con_work);
- }
- EXPORT_SYMBOL(ceph_con_init);
- /*
- * We maintain a global counter to order connection attempts. Get
- * a unique seq greater than @gt.
- */
- static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
- {
- u32 ret;
- spin_lock(&msgr->global_seq_lock);
- if (msgr->global_seq < gt)
- msgr->global_seq = gt;
- ret = ++msgr->global_seq;
- spin_unlock(&msgr->global_seq_lock);
- return ret;
- }
- /*
- * Prepare footer for currently outgoing message, and finish things
- * off. Assumes out_kvec* are already valid.. we just add on to the end.
- */
- static void prepare_write_message_footer(struct ceph_connection *con, int v)
- {
- struct ceph_msg *m = con->out_msg;
- dout("prepare_write_message_footer %p\n", con);
- con->out_kvec_is_msg = true;
- con->out_kvec[v].iov_base = &m->footer;
- con->out_kvec[v].iov_len = sizeof(m->footer);
- con->out_kvec_bytes += sizeof(m->footer);
- con->out_kvec_left++;
- con->out_more = m->more_to_follow;
- con->out_msg_done = true;
- }
- /*
- * Prepare headers for the next outgoing message.
- */
- static void prepare_write_message(struct ceph_connection *con)
- {
- struct ceph_msg *m;
- int v = 0;
- con->out_kvec_bytes = 0;
- con->out_kvec_is_msg = true;
- con->out_msg_done = false;
- /* Sneak an ack in there first? If we can get it into the same
- * TCP packet that's a good thing. */
- if (con->in_seq > con->in_seq_acked) {
- con->in_seq_acked = con->in_seq;
- con->out_kvec[v].iov_base = &tag_ack;
- con->out_kvec[v++].iov_len = 1;
- con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
- con->out_kvec[v].iov_base = &con->out_temp_ack;
- con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
- con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
- }
- m = list_first_entry(&con->out_queue,
- struct ceph_msg, list_head);
- con->out_msg = m;
- /* put message on sent list */
- ceph_msg_get(m);
- list_move_tail(&m->list_head, &con->out_sent);
- /*
- * only assign outgoing seq # if we haven't sent this message
- * yet. if it is requeued, resend with it's original seq.
- */
- if (m->needs_out_seq) {
- m->hdr.seq = cpu_to_le64(++con->out_seq);
- m->needs_out_seq = false;
- }
- dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
- m, con->out_seq, le16_to_cpu(m->hdr.type),
- le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
- le32_to_cpu(m->hdr.data_len),
- m->nr_pages);
- BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
- /* tag + hdr + front + middle */
- con->out_kvec[v].iov_base = &tag_msg;
- con->out_kvec[v++].iov_len = 1;
- con->out_kvec[v].iov_base = &m->hdr;
- con->out_kvec[v++].iov_len = sizeof(m->hdr);
- con->out_kvec[v++] = m->front;
- if (m->middle)
- con->out_kvec[v++] = m->middle->vec;
- con->out_kvec_left = v;
- con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len +
- (m->middle ? m->middle->vec.iov_len : 0);
- con->out_kvec_cur = con->out_kvec;
- /* fill in crc (except data pages), footer */
- con->out_msg->hdr.crc =
- cpu_to_le32(crc32c(0, (void *)&m->hdr,
- sizeof(m->hdr) - sizeof(m->hdr.crc)));
- con->out_msg->footer.flags = CEPH_MSG_FOOTER_COMPLETE;
- con->out_msg->footer.front_crc =
- cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
- if (m->middle)
- con->out_msg->footer.middle_crc =
- cpu_to_le32(crc32c(0, m->middle->vec.iov_base,
- m->middle->vec.iov_len));
- 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",
- 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 = 0;
- con->out_more = 1; /* data + footer will follow */
- } else {
- /* no, queue up footer too and be done */
- prepare_write_message_footer(con, v);
- }
- set_bit(WRITE_PENDING, &con->state);
- }
- /*
- * Prepare an ack.
- */
- static void prepare_write_ack(struct ceph_connection *con)
- {
- dout("prepare_write_ack %p %llu -> %llu\n", con,
- con->in_seq_acked, con->in_seq);
- con->in_seq_acked = con->in_seq;
- con->out_kvec[0].iov_base = &tag_ack;
- con->out_kvec[0].iov_len = 1;
- con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
- con->out_kvec[1].iov_base = &con->out_temp_ack;
- con->out_kvec[1].iov_len = sizeof(con->out_temp_ack);
- con->out_kvec_left = 2;
- con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
- con->out_kvec_cur = con->out_kvec;
- con->out_more = 1; /* more will follow.. eventually.. */
- set_bit(WRITE_PENDING, &con->state);
- }
- /*
- * Prepare to write keepalive byte.
- */
- static void prepare_write_keepalive(struct ceph_connection *con)
- {
- dout("prepare_write_keepalive %p\n", con);
- con->out_kvec[0].iov_base = &tag_keepalive;
- con->out_kvec[0].iov_len = 1;
- con->out_kvec_left = 1;
- con->out_kvec_bytes = 1;
- con->out_kvec_cur = con->out_kvec;
- set_bit(WRITE_PENDING, &con->state);
- }
- /*
- * Connection negotiation.
- */
- static int prepare_connect_authorizer(struct ceph_connection *con)
- {
- void *auth_buf;
- int auth_len = 0;
- int auth_protocol = 0;
- mutex_unlock(&con->mutex);
- if (con->ops->get_authorizer)
- con->ops->get_authorizer(con, &auth_buf, &auth_len,
- &auth_protocol, &con->auth_reply_buf,
- &con->auth_reply_buf_len,
- con->auth_retry);
- mutex_lock(&con->mutex);
- if (test_bit(CLOSED, &con->state) ||
- test_bit(OPENING, &con->state))
- return -EAGAIN;
- con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
- con->out_connect.authorizer_len = cpu_to_le32(auth_len);
- if (auth_len) {
- con->out_kvec[con->out_kvec_left].iov_base = auth_buf;
- con->out_kvec[con->out_kvec_left].iov_len = auth_len;
- con->out_kvec_left++;
- con->out_kvec_bytes += auth_len;
- }
- return 0;
- }
- /*
- * We connected to a peer and are saying hello.
- */
- static void prepare_write_banner(struct ceph_messenger *msgr,
- struct ceph_connection *con)
- {
- int len = strlen(CEPH_BANNER);
- con->out_kvec[0].iov_base = CEPH_BANNER;
- con->out_kvec[0].iov_len = len;
- con->out_kvec[1].iov_base = &msgr->my_enc_addr;
- con->out_kvec[1].iov_len = sizeof(msgr->my_enc_addr);
- con->out_kvec_left = 2;
- con->out_kvec_bytes = len + sizeof(msgr->my_enc_addr);
- con->out_kvec_cur = con->out_kvec;
- con->out_more = 0;
- set_bit(WRITE_PENDING, &con->state);
- }
- static int prepare_write_connect(struct ceph_messenger *msgr,
- struct ceph_connection *con,
- int after_banner)
- {
- unsigned global_seq = get_global_seq(con->msgr, 0);
- int proto;
- switch (con->peer_name.type) {
- case CEPH_ENTITY_TYPE_MON:
- proto = CEPH_MONC_PROTOCOL;
- break;
- case CEPH_ENTITY_TYPE_OSD:
- proto = CEPH_OSDC_PROTOCOL;
- break;
- case CEPH_ENTITY_TYPE_MDS:
- proto = CEPH_MDSC_PROTOCOL;
- break;
- default:
- BUG();
- }
- dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
- con->connect_seq, global_seq, proto);
- con->out_connect.features = cpu_to_le64(msgr->supported_features);
- 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);
- con->out_connect.protocol_version = cpu_to_le32(proto);
- con->out_connect.flags = 0;
- if (!after_banner) {
- con->out_kvec_left = 0;
- con->out_kvec_bytes = 0;
- }
- con->out_kvec[con->out_kvec_left].iov_base = &con->out_connect;
- con->out_kvec[con->out_kvec_left].iov_len = sizeof(con->out_connect);
- con->out_kvec_left++;
- con->out_kvec_bytes += sizeof(con->out_connect);
- con->out_kvec_cur = con->out_kvec;
- con->out_more = 0;
- set_bit(WRITE_PENDING, &con->state);
- return prepare_connect_authorizer(con);
- }
- /*
- * write as much of pending kvecs to the socket as we can.
- * 1 -> done
- * 0 -> socket full, but more to do
- * <0 -> error
- */
- static int write_partial_kvec(struct ceph_connection *con)
- {
- int ret;
- dout("write_partial_kvec %p %d left\n", con, con->out_kvec_bytes);
- while (con->out_kvec_bytes > 0) {
- ret = ceph_tcp_sendmsg(con->sock, con->out_kvec_cur,
- con->out_kvec_left, con->out_kvec_bytes,
- con->out_more);
- if (ret <= 0)
- goto out;
- con->out_kvec_bytes -= ret;
- if (con->out_kvec_bytes == 0)
- break; /* done */
- while (ret > 0) {
- if (ret >= con->out_kvec_cur->iov_len) {
- ret -= con->out_kvec_cur->iov_len;
- con->out_kvec_cur++;
- con->out_kvec_left--;
- } else {
- con->out_kvec_cur->iov_len -= ret;
- con->out_kvec_cur->iov_base += ret;
- ret = 0;
- break;
- }
- }
- }
- con->out_kvec_left = 0;
- con->out_kvec_is_msg = false;
- ret = 1;
- out:
- dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con,
- con->out_kvec_bytes, con->out_kvec_left, ret);
- return ret; /* done! */
- }
- #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
- /*
- * Write as much message data payload as we can. If we finish, queue
- * up the footer.
- * 1 -> done, footer is now queued in out_kvec[].
- * 0 -> socket full, but more to do
- * <0 -> error
- */
- static int write_partial_msg_pages(struct ceph_connection *con)
- {
- struct ceph_msg *msg = con->out_msg;
- unsigned data_len = le32_to_cpu(msg->hdr.data_len);
- size_t len;
- int crc = con->msgr->nocrc;
- int ret;
- int total_max_write;
- int in_trail = 0;
- size_t trail_len = (msg->trail ? msg->trail->length : 0);
- 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->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
- while (data_len > con->out_msg_pos.data_pos) {
- struct page *page = NULL;
- void *kaddr = NULL;
- int max_write = PAGE_SIZE;
- int page_shift = 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;
- total_max_write = data_len - con->out_msg_pos.data_pos;
- page = list_first_entry(&msg->trail->head,
- struct page, lru);
- if (crc)
- kaddr = kmap(page);
- max_write = PAGE_SIZE;
- } else if (msg->pages) {
- page = msg->pages[con->out_msg_pos.page];
- if (crc)
- kaddr = kmap(page);
- } else if (msg->pagelist) {
- page = list_first_entry(&msg->pagelist->head,
- struct page, lru);
- if (crc)
- kaddr = kmap(page);
- #ifdef CONFIG_BLOCK
- } else if (msg->bio) {
- struct bio_vec *bv;
- bv = bio_iovec_idx(msg->bio_iter, msg->bio_seg);
- page = bv->bv_page;
- page_shift = bv->bv_offset;
- if (crc)
- kaddr = kmap(page) + page_shift;
- max_write = bv->bv_len;
- #endif
- } else {
- page = con->msgr->zero_page;
- if (crc)
- kaddr = page_address(con->msgr->zero_page);
- }
- len = min_t(int, max_write - con->out_msg_pos.page_pos,
- total_max_write);
- if (crc && !con->out_msg_pos.did_page_crc) {
- void *base = kaddr + con->out_msg_pos.page_pos;
- u32 tmpcrc = le32_to_cpu(con->out_msg->footer.data_crc);
- BUG_ON(kaddr == NULL);
- con->out_msg->footer.data_crc =
- cpu_to_le32(crc32c(tmpcrc, base, len));
- con->out_msg_pos.did_page_crc = 1;
- }
- ret = kernel_sendpage(con->sock, page,
- con->out_msg_pos.page_pos + page_shift,
- len,
- MSG_DONTWAIT | MSG_NOSIGNAL |
- MSG_MORE);
- if (crc &&
- (msg->pages || msg->pagelist || msg->bio || in_trail))
- kunmap(page);
- if (ret == -EAGAIN)
- ret = 0;
- 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 = 0;
- 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
- }
- }
- dout("write_partial_msg_pages %p msg %p done\n", con, msg);
- /* prepare and queue up footer, too */
- if (!crc)
- con->out_msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
- con->out_kvec_bytes = 0;
- con->out_kvec_left = 0;
- con->out_kvec_cur = con->out_kvec;
- prepare_write_message_footer(con, 0);
- ret = 1;
- out:
- return ret;
- }
- /*
- * write some zeros
- */
- static int write_partial_skip(struct ceph_connection *con)
- {
- int ret;
- while (con->out_skip > 0) {
- struct kvec iov = {
- .iov_base = page_address(con->msgr->zero_page),
- .iov_len = min(con->out_skip, (int)PAGE_CACHE_SIZE)
- };
- ret = ceph_tcp_sendmsg(con->sock, &iov, 1, iov.iov_len, 1);
- if (ret <= 0)
- goto out;
- con->out_skip -= ret;
- }
- ret = 1;
- out:
- return ret;
- }
- /*
- * Prepare to read connection handshake, or an ack.
- */
- static void prepare_read_banner(struct ceph_connection *con)
- {
- dout("prepare_read_banner %p\n", con);
- con->in_base_pos = 0;
- }
- static void prepare_read_connect(struct ceph_connection *con)
- {
- dout("prepare_read_connect %p\n", con);
- con->in_base_pos = 0;
- }
- static void prepare_read_ack(struct ceph_connection *con)
- {
- dout("prepare_read_ack %p\n", con);
- con->in_base_pos = 0;
- }
- static void prepare_read_tag(struct ceph_connection *con)
- {
- dout("prepare_read_tag %p\n", con);
- con->in_base_pos = 0;
- con->in_tag = CEPH_MSGR_TAG_READY;
- }
- /*
- * Prepare to read a message.
- */
- static int prepare_read_message(struct ceph_connection *con)
- {
- dout("prepare_read_message %p\n", con);
- BUG_ON(con->in_msg != NULL);
- con->in_base_pos = 0;
- con->in_front_crc = con->in_middle_crc = con->in_data_crc = 0;
- return 0;
- }
- static int read_partial(struct ceph_connection *con,
- int *to, int size, void *object)
- {
- *to += size;
- while (con->in_base_pos < *to) {
- int left = *to - con->in_base_pos;
- int have = size - left;
- int ret = ceph_tcp_recvmsg(con->sock, object + have, left);
- if (ret <= 0)
- return ret;
- con->in_base_pos += ret;
- }
- return 1;
- }
- /*
- * Read all or part of the connect-side handshake on a new connection
- */
- static int read_partial_banner(struct ceph_connection *con)
- {
- int ret, to = 0;
- dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
- /* peer's banner */
- ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
- if (ret <= 0)
- goto out;
- ret = read_partial(con, &to, sizeof(con->actual_peer_addr),
- &con->actual_peer_addr);
- if (ret <= 0)
- goto out;
- ret = read_partial(con, &to, sizeof(con->peer_addr_for_me),
- &con->peer_addr_for_me);
- if (ret <= 0)
- goto out;
- out:
- return ret;
- }
- static int read_partial_connect(struct ceph_connection *con)
- {
- int ret, to = 0;
- dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
- ret = read_partial(con, &to, sizeof(con->in_reply), &con->in_reply);
- if (ret <= 0)
- goto out;
- ret = read_partial(con, &to, le32_to_cpu(con->in_reply.authorizer_len),
- con->auth_reply_buf);
- if (ret <= 0)
- goto out;
- dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
- con, (int)con->in_reply.tag,
- le32_to_cpu(con->in_reply.connect_seq),
- le32_to_cpu(con->in_reply.global_seq));
- out:
- return ret;
- }
- /*
- * Verify the hello banner looks okay.
- */
- static int verify_hello(struct ceph_connection *con)
- {
- if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
- pr_err("connect to %s got bad banner\n",
- ceph_pr_addr(&con->peer_addr.in_addr));
- con->error_msg = "protocol error, bad banner";
- return -1;
- }
- return 0;
- }
- static bool addr_is_blank(struct sockaddr_storage *ss)
- {
- switch (ss->ss_family) {
- case AF_INET:
- return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0;
- case AF_INET6:
- return
- ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 &&
- ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 &&
- ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 &&
- ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0;
- }
- return false;
- }
- static int addr_port(struct sockaddr_storage *ss)
- {
- switch (ss->ss_family) {
- case AF_INET:
- return ntohs(((struct sockaddr_in *)ss)->sin_port);
- case AF_INET6:
- return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
- }
- return 0;
- }
- static void addr_set_port(struct sockaddr_storage *ss, int p)
- {
- switch (ss->ss_family) {
- case AF_INET:
- ((struct sockaddr_in *)ss)->sin_port = htons(p);
- break;
- case AF_INET6:
- ((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
- break;
- }
- }
- /*
- * Parse an ip[:port] list into an addr array. Use the default
- * monitor port if a port isn't specified.
- */
- int ceph_parse_ips(const char *c, const char *end,
- struct ceph_entity_addr *addr,
- int max_count, int *count)
- {
- int i;
- const char *p = c;
- dout("parse_ips on '%.*s'\n", (int)(end-c), c);
- for (i = 0; i < max_count; i++) {
- const char *ipend;
- struct sockaddr_storage *ss = &addr[i].in_addr;
- struct sockaddr_in *in4 = (void *)ss;
- struct sockaddr_in6 *in6 = (void *)ss;
- int port;
- char delim = ',';
- if (*p == '[') {
- delim = ']';
- p++;
- }
- memset(ss, 0, sizeof(*ss));
- if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
- delim, &ipend))
- ss->ss_family = AF_INET;
- else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
- delim, &ipend))
- ss->ss_family = AF_INET6;
- else
- goto bad;
- p = ipend;
- if (delim == ']') {
- if (*p != ']') {
- dout("missing matching ']'\n");
- goto bad;
- }
- p++;
- }
- /* port? */
- if (p < end && *p == ':') {
- port = 0;
- p++;
- while (p < end && *p >= '0' && *p <= '9') {
- port = (port * 10) + (*p - '0');
- p++;
- }
- if (port > 65535 || port == 0)
- goto bad;
- } else {
- port = CEPH_MON_PORT;
- }
- addr_set_port(ss, port);
- dout("parse_ips got %s\n", ceph_pr_addr(ss));
- if (p == end)
- break;
- if (*p != ',')
- goto bad;
- p++;
- }
- if (p != end)
- goto bad;
- if (count)
- *count = i + 1;
- return 0;
- bad:
- pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
- return -EINVAL;
- }
- EXPORT_SYMBOL(ceph_parse_ips);
- static int process_banner(struct ceph_connection *con)
- {
- dout("process_banner on %p\n", con);
- if (verify_hello(con) < 0)
- return -1;
- ceph_decode_addr(&con->actual_peer_addr);
- ceph_decode_addr(&con->peer_addr_for_me);
- /*
- * Make sure the other end is who we wanted. note that the other
- * end may not yet know their ip address, so if it's 0.0.0.0, give
- * them the benefit of the doubt.
- */
- if (memcmp(&con->peer_addr, &con->actual_peer_addr,
- sizeof(con->peer_addr)) != 0 &&
- !(addr_is_blank(&con->actual_peer_addr.in_addr) &&
- con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
- pr_warning("wrong peer, want %s/%d, got %s/%d\n",
- ceph_pr_addr(&con->peer_addr.in_addr),
- (int)le32_to_cpu(con->peer_addr.nonce),
- ceph_pr_addr(&con->actual_peer_addr.in_addr),
- (int)le32_to_cpu(con->actual_peer_addr.nonce));
- con->error_msg = "wrong peer at address";
- return -1;
- }
- /*
- * did we learn our address?
- */
- if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
- int port = addr_port(&con->msgr->inst.addr.in_addr);
- memcpy(&con->msgr->inst.addr.in_addr,
- &con->peer_addr_for_me.in_addr,
- sizeof(con->peer_addr_for_me.in_addr));
- addr_set_port(&con->msgr->inst.addr.in_addr, port);
- encode_my_addr(con->msgr);
- dout("process_banner learned my addr is %s\n",
- 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);
- }
- static int process_connect(struct ceph_connection *con)
- {
- u64 sup_feat = con->msgr->supported_features;
- u64 req_feat = con->msgr->required_features;
- u64 server_feat = le64_to_cpu(con->in_reply.features);
- int ret;
- 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),
- ceph_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:
- pr_err("%s%lld %s protocol version mismatch,"
- " my %d != server's %d\n",
- ENTITY_NAME(con->peer_name),
- ceph_pr_addr(&con->peer_addr.in_addr),
- le32_to_cpu(con->out_connect.protocol_version),
- le32_to_cpu(con->in_reply.protocol_version));
- con->error_msg = "protocol version mismatch";
- fail_protocol(con);
- return -1;
- case CEPH_MSGR_TAG_BADAUTHORIZER:
- con->auth_retry++;
- dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
- con->auth_retry);
- if (con->auth_retry == 2) {
- con->error_msg = "connect authorization failure";
- return -1;
- }
- con->auth_retry = 1;
- ret = prepare_write_connect(con->msgr, con, 0);
- if (ret < 0)
- return ret;
- prepare_read_connect(con);
- break;
- case CEPH_MSGR_TAG_RESETSESSION:
- /*
- * If we connected with a large connect_seq but the peer
- * has no record of a session with us (no connection, or
- * connect_seq == 0), they will send RESETSESION to indicate
- * that they must have reset their session, and may have
- * dropped messages.
- */
- dout("process_connect got RESET peer seq %u\n",
- le32_to_cpu(con->in_connect.connect_seq));
- pr_err("%s%lld %s connection reset\n",
- ENTITY_NAME(con->peer_name),
- ceph_pr_addr(&con->peer_addr.in_addr));
- reset_connection(con);
- prepare_write_connect(con->msgr, con, 0);
- prepare_read_connect(con);
- /* Tell ceph about it. */
- mutex_unlock(&con->mutex);
- pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
- 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))
- return -EAGAIN;
- break;
- case CEPH_MSGR_TAG_RETRY_SESSION:
- /*
- * If we sent a smaller connect_seq than the peer has, try
- * again with a larger value.
- */
- dout("process_connect got RETRY my seq = %u, peer_seq = %u\n",
- le32_to_cpu(con->out_connect.connect_seq),
- le32_to_cpu(con->in_connect.connect_seq));
- con->connect_seq = le32_to_cpu(con->in_connect.connect_seq);
- prepare_write_connect(con->msgr, con, 0);
- prepare_read_connect(con);
- break;
- case CEPH_MSGR_TAG_RETRY_GLOBAL:
- /*
- * If we sent a smaller global_seq than the peer has, try
- * again with a larger value.
- */
- dout("process_connect got RETRY_GLOBAL my %u peer_gseq %u\n",
- con->peer_global_seq,
- le32_to_cpu(con->in_connect.global_seq));
- get_global_seq(con->msgr,
- le32_to_cpu(con->in_connect.global_seq));
- prepare_write_connect(con->msgr, con, 0);
- prepare_read_connect(con);
- 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),
- ceph_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++;
- con->peer_features = server_feat;
- dout("process_connect got READY gseq %d cseq %d (%d)\n",
- con->peer_global_seq,
- le32_to_cpu(con->in_reply.connect_seq),
- con->connect_seq);
- WARN_ON(con->connect_seq !=
- le32_to_cpu(con->in_reply.connect_seq));
- if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
- set_bit(LOSSYTX, &con->state);
- prepare_read_tag(con);
- break;
- case CEPH_MSGR_TAG_WAIT:
- /*
- * If there is a connection race (we are opening
- * connections to each other), one of us may just have
- * to WAIT. This shouldn't happen if we are the
- * client.
- */
- pr_err("process_connect got WAIT as client\n");
- con->error_msg = "protocol error, got WAIT as client";
- return -1;
- default:
- pr_err("connect protocol error, will retry\n");
- con->error_msg = "protocol error, garbage tag during connect";
- return -1;
- }
- return 0;
- }
- /*
- * read (part of) an ack
- */
- static int read_partial_ack(struct ceph_connection *con)
- {
- int to = 0;
- return read_partial(con, &to, sizeof(con->in_temp_ack),
- &con->in_temp_ack);
- }
- /*
- * We can finally discard anything that's been acked.
- */
- static void process_ack(struct ceph_connection *con)
- {
- struct ceph_msg *m;
- u64 ack = le64_to_cpu(con->in_temp_ack);
- u64 seq;
- while (!list_empty(&con->out_sent)) {
- m = list_first_entry(&con->out_sent, struct ceph_msg,
- list_head);
- seq = le64_to_cpu(m->hdr.seq);
- if (seq > ack)
- break;
- dout("got ack for seq %llu type %d at %p\n", seq,
- le16_to_cpu(m->hdr.type), m);
- m->ack_stamp = jiffies;
- ceph_msg_remove(m);
- }
- prepare_read_tag(con);
- }
- static int read_partial_message_section(struct ceph_connection *con,
- struct kvec *section,
- unsigned int sec_len, u32 *crc)
- {
- int ret, left;
- BUG_ON(!section);
- while (section->iov_len < sec_len) {
- BUG_ON(section->iov_base == NULL);
- left = sec_len - section->iov_len;
- ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
- section->iov_len, left);
- if (ret <= 0)
- return ret;
- section->iov_len += ret;
- if (section->iov_len == sec_len)
- *crc = crc32c(0, section->iov_base,
- section->iov_len);
- }
- return 1;
- }
- static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
- struct ceph_msg_header *hdr,
- int *skip);
- static int read_partial_message_pages(struct ceph_connection *con,
- struct page **pages,
- unsigned data_len, int datacrc)
- {
- void *p;
- int ret;
- int left;
- left = min((int)(data_len - con->in_msg_pos.data_pos),
- (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
- /* (page) data */
- BUG_ON(pages == NULL);
- p = kmap(pages[con->in_msg_pos.page]);
- ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
- left);
- if (ret > 0 && datacrc)
- con->in_data_crc =
- crc32c(con->in_data_crc,
- p + con->in_msg_pos.page_pos, ret);
- kunmap(pages[con->in_msg_pos.page]);
- if (ret <= 0)
- return ret;
- con->in_msg_pos.data_pos += ret;
- con->in_msg_pos.page_pos += ret;
- if (con->in_msg_pos.page_pos == PAGE_SIZE) {
- con->in_msg_pos.page_pos = 0;
- con->in_msg_pos.page++;
- }
- return ret;
- }
- #ifdef CONFIG_BLOCK
- static int read_partial_message_bio(struct ceph_connection *con,
- struct bio **bio_iter, int *bio_seg,
- unsigned data_len, int datacrc)
- {
- struct bio_vec *bv = bio_iovec_idx(*bio_iter, *bio_seg);
- 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));
- p = kmap(bv->bv_page) + bv->bv_offset;
- ret = ceph_tcp_recvmsg(con->sock, p + con->in_msg_pos.page_pos,
- left);
- if (ret > 0 && datacrc)
- con->in_data_crc =
- crc32c(con->in_data_crc,
- p + con->in_msg_pos.page_pos, ret);
- kunmap(bv->bv_page);
- if (ret <= 0)
- return ret;
- con->in_msg_pos.data_pos += ret;
- con->in_msg_pos.page_pos += ret;
- if (con->in_msg_pos.page_pos == bv->bv_len) {
- con->in_msg_pos.page_pos = 0;
- iter_bio_next(bio_iter, bio_seg);
- }
- return ret;
- }
- #endif
- /*
- * read (part of) a message.
- */
- static int read_partial_message(struct ceph_connection *con)
- {
- struct ceph_msg *m = con->in_msg;
- int ret;
- int to, left;
- unsigned front_len, middle_len, data_len;
- int datacrc = con->msgr->nocrc;
- int skip;
- u64 seq;
- dout("read_partial_message con %p msg %p\n", con, m);
- /* header */
- while (con->in_base_pos < sizeof(con->in_hdr)) {
- left = sizeof(con->in_hdr) - con->in_base_pos;
- ret = ceph_tcp_recvmsg(con->sock,
- (char *)&con->in_hdr + con->in_base_pos,
- left);
- if (ret <= 0)
- return ret;
- con->in_base_pos += ret;
- if (con->in_base_pos == sizeof(con->in_hdr)) {
- u32 crc = crc32c(0, (void *)&con->in_hdr,
- sizeof(con->in_hdr) - sizeof(con->in_hdr.crc));
- if (crc != le32_to_cpu(con->in_hdr.crc)) {
- pr_err("read_partial_message bad hdr "
- " crc %u != expected %u\n",
- crc, con->in_hdr.crc);
- return -EBADMSG;
- }
- }
- }
- front_len = le32_to_cpu(con->in_hdr.front_len);
- if (front_len > CEPH_MSG_MAX_FRONT_LEN)
- return -EIO;
- middle_len = le32_to_cpu(con->in_hdr.middle_len);
- if (middle_len > CEPH_MSG_MAX_DATA_LEN)
- return -EIO;
- data_len = le32_to_cpu(con->in_hdr.data_len);
- if (data_len > CEPH_MSG_MAX_DATA_LEN)
- return -EIO;
- /* verify seq# */
- seq = le64_to_cpu(con->in_hdr.seq);
- if ((s64)seq - (s64)con->in_seq < 1) {
- pr_info("skipping %s%lld %s seq %lld expected %lld\n",
- ENTITY_NAME(con->peer_name),
- ceph_pr_addr(&con->peer_addr.in_addr),
- seq, con->in_seq + 1);
- con->in_base_pos = -front_len - middle_len - data_len -
- sizeof(m->footer);
- con->in_tag = CEPH_MSGR_TAG_READY;
- return 0;
- } else if ((s64)seq - (s64)con->in_seq > 1) {
- pr_err("read_partial_message bad seq %lld expected %lld\n",
- seq, con->in_seq + 1);
- con->error_msg = "bad message sequence # for incoming message";
- return -EBADMSG;
- }
- /* allocate message? */
- if (!con->in_msg) {
- 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);
- if (skip) {
- /* skip this message */
- dout("alloc_msg said skip message\n");
- BUG_ON(con->in_msg);
- con->in_base_pos = -front_len - middle_len - data_len -
- sizeof(m->footer);
- con->in_tag = CEPH_MSGR_TAG_READY;
- con->in_seq++;
- return 0;
- }
- if (!con->in_msg) {
- con->error_msg =
- "error allocating memory for incoming message";
- return -ENOMEM;
- }
- m = con->in_msg;
- m->front.iov_len = 0; /* haven't read it yet */
- if (m->middle)
- m->middle->vec.iov_len = 0;
- con->in_msg_pos.page = 0;
- if (m->pages)
- con->in_msg_pos.page_pos = m->page_alignment;
- else
- con->in_msg_pos.page_pos = 0;
- con->in_msg_pos.data_pos = 0;
- }
- /* front */
- ret = read_partial_message_section(con, &m->front, front_len,
- &con->in_front_crc);
- if (ret <= 0)
- return ret;
- /* middle */
- if (m->middle) {
- ret = read_partial_message_section(con, &m->middle->vec,
- middle_len,
- &con->in_middle_crc);
- 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) {
- if (m->pages) {
- ret = read_partial_message_pages(con, m->pages,
- data_len, datacrc);
- if (ret <= 0)
- return ret;
- #ifdef CONFIG_BLOCK
- } else if (m->bio) {
- ret = read_partial_message_bio(con,
- &m->bio_iter, &m->bio_seg,
- data_len, datacrc);
- if (ret <= 0)
- return ret;
- #endif
- } else {
- BUG_ON(1);
- }
- }
- /* footer */
- to = sizeof(m->hdr) + sizeof(m->footer);
- while (con->in_base_pos < to) {
- left = to - con->in_base_pos;
- ret = ceph_tcp_recvmsg(con->sock, (char *)&m->footer +
- (con->in_base_pos - sizeof(m->hdr)),
- left);
- if (ret <= 0)
- return ret;
- con->in_base_pos += ret;
- }
- dout("read_partial_message got msg %p %d (%u) + %d (%u) + %d (%u)\n",
- m, front_len, m->footer.front_crc, middle_len,
- m->footer.middle_crc, data_len, m->footer.data_crc);
- /* crc ok? */
- if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
- pr_err("read_partial_message %p front crc %u != exp. %u\n",
- m, con->in_front_crc, m->footer.front_crc);
- return -EBADMSG;
- }
- if (con->in_middle_crc != le32_to_cpu(m->footer.middle_crc)) {
- pr_err("read_partial_message %p middle crc %u != exp %u\n",
- m, con->in_middle_crc, m->footer.middle_crc);
- return -EBADMSG;
- }
- if (datacrc &&
- (m->footer.flags & CEPH_MSG_FOOTER_NOCRC) == 0 &&
- con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
- pr_err("read_partial_message %p data crc %u != exp. %u\n", m,
- con->in_data_crc, le32_to_cpu(m->footer.data_crc));
- return -EBADMSG;
- }
- return 1; /* done! */
- }
- /*
- * Process message. This happens in the worker thread. The callback should
- * be careful not to do anything that waits on other incoming messages or it
- * may deadlock.
- */
- static void process_message(struct ceph_connection *con)
- {
- struct ceph_msg *msg;
- msg = con->in_msg;
- con->in_msg = NULL;
- /* if first message, set peer_name */
- if (con->peer_name.type == 0)
- con->peer_name = msg->hdr.src;
- con->in_seq++;
- mutex_unlock(&con->mutex);
- dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
- msg, le64_to_cpu(msg->hdr.seq),
- ENTITY_NAME(msg->hdr.src),
- le16_to_cpu(msg->hdr.type),
- ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
- le32_to_cpu(msg->hdr.front_len),
- le32_to_cpu(msg->hdr.data_len),
- con->in_front_crc, con->in_middle_crc, con->in_data_crc);
- con->ops->dispatch(con, msg);
- mutex_lock(&con->mutex);
- prepare_read_tag(con);
- }
- /*
- * Write something to the socket. Called in a worker thread when the
- * socket appears to be writeable and we have something ready to send.
- */
- static int try_write(struct ceph_connection *con)
- {
- struct ceph_messenger *msgr = con->msgr;
- int ret = 1;
- dout("try_write start %p state %lu nref %d\n", con, con->state,
- atomic_read(&con->nref));
- more:
- dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
- /* open the socket first? */
- if (con->sock == NULL) {
- prepare_write_banner(msgr, con);
- prepare_write_connect(msgr, con, 1);
- 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;
- dout("try_write initiating connect on %p new state %lu\n",
- con, con->state);
- con->sock = ceph_tcp_connect(con);
- if (IS_ERR(con->sock)) {
- con->sock = NULL;
- con->error_msg = "connect error";
- ret = -1;
- goto out;
- }
- }
- more_kvec:
- /* kvec data queued? */
- if (con->out_skip) {
- ret = write_partial_skip(con);
- if (ret <= 0)
- goto out;
- }
- if (con->out_kvec_left) {
- ret = write_partial_kvec(con);
- if (ret <= 0)
- goto out;
- }
- /* msg pages? */
- if (con->out_msg) {
- if (con->out_msg_done) {
- ceph_msg_put(con->out_msg);
- con->out_msg = NULL; /* we're done with this one */
- goto do_next;
- }
- ret = write_partial_msg_pages(con);
- if (ret == 1)
- goto more_kvec; /* we need to send the footer, too! */
- if (ret == 0)
- goto out;
- if (ret < 0) {
- dout("try_write write_partial_msg_pages err %d\n",
- ret);
- goto out;
- }
- }
- do_next:
- if (!test_bit(CONNECTING, &con->state)) {
- /* is anything else pending? */
- if (!list_empty(&con->out_queue)) {
- prepare_write_message(con);
- goto more;
- }
- if (con->in_seq > con->in_seq_acked) {
- prepare_write_ack(con);
- goto more;
- }
- if (test_and_clear_bit(KEEPALIVE_PENDING, &con->state)) {
- prepare_write_keepalive(con);
- goto more;
- }
- }
- /* Nothing to do! */
- clear_bit(WRITE_PENDING, &con->state);
- dout("try_write nothing else to write.\n");
- ret = 0;
- out:
- dout("try_write done on %p ret %d\n", con, ret);
- return ret;
- }
- /*
- * Read what we can from the socket.
- */
- static int try_read(struct ceph_connection *con)
- {
- int ret = -1;
- if (!con->sock)
- return 0;
- if (test_bit(STANDBY, &con->state))
- return 0;
- dout("try_read start on %p\n", con);
- 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;
- 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;
- }
- ret = read_partial_connect(con);
- if (ret <= 0)
- goto out;
- ret = process_connect(con);
- if (ret < 0)
- goto out;
- goto more;
- }
- if (con->in_base_pos < 0) {
- /*
- * skipping + discarding content.
- *
- * FIXME: there must be a better way to do this!
- */
- static char buf[1024];
- int skip = min(1024, -con->in_base_pos);
- dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
- ret = ceph_tcp_recvmsg(con->sock, buf, skip);
- if (ret <= 0)
- goto out;
- con->in_base_pos += ret;
- if (con->in_base_pos)
- goto more;
- }
- if (con->in_tag == CEPH_MSGR_TAG_READY) {
- /*
- * what's next?
- */
- ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
- if (ret <= 0)
- goto out;
- dout("try_read got tag %d\n", (int)con->in_tag);
- switch (con->in_tag) {
- case CEPH_MSGR_TAG_MSG:
- prepare_read_message(con);
- break;
- case CEPH_MSGR_TAG_ACK:
- prepare_read_ack(con);
- break;
- case CEPH_MSGR_TAG_CLOSE:
- set_bit(CLOSED, &con->state); /* fixme */
- goto out;
- default:
- goto bad_tag;
- }
- }
- if (con->in_tag == CEPH_MSGR_TAG_MSG) {
- ret = read_partial_message(con);
- if (ret <= 0) {
- switch (ret) {
- case -EBADMSG:
- con->error_msg = "bad crc";
- ret = -EIO;
- break;
- case -EIO:
- con->error_msg = "io error";
- break;
- }
- goto out;
- }
- if (con->in_tag == CEPH_MSGR_TAG_READY)
- goto more;
- process_message(con);
- goto more;
- }
- if (con->in_tag == CEPH_MSGR_TAG_ACK) {
- ret = read_partial_ack(con);
- if (ret <= 0)
- goto out;
- process_ack(con);
- goto more;
- }
- out:
- dout("try_read done on %p ret %d\n", con, ret);
- return ret;
- bad_tag:
- pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
- con->error_msg = "protocol error, garbage tag";
- ret = -1;
- goto out;
- }
- /*
- * Atomically queue work on a connection. Bump @con reference to
- * avoid races with connection teardown.
- */
- 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;
- }
- if (!queue_delayed_work(ceph_msgr_wq, &con->work, 0)) {
- dout("queue_con %p - already queued\n", con);
- con->ops->put(con);
- } else {
- dout("queue_con %p\n", con);
- }
- }
- /*
- * Do some work on a connection. Drop a connection ref when we're done.
- */
- static void con_work(struct work_struct *work)
- {
- struct ceph_connection *con = container_of(work, struct ceph_connection,
- work.work);
- int ret;
- mutex_lock(&con->mutex);
- restart:
- if (test_and_clear_bit(BACKOFF, &con->state)) {
- dout("con_work %p backing off\n", con);
- if (queue_delayed_work(ceph_msgr_wq, &con->work,
- round_jiffies_relative(con->delay))) {
- dout("con_work %p backoff %lu\n", con, con->delay);
- mutex_unlock(&con->mutex);
- return;
- } else {
- con->ops->put(con);
- dout("con_work %p FAILED to back off %lu\n", con,
-