1 files changed, 0 insertions, 2432 deletions

diff --git a/fs/ceph/messenger.c b/fs/ceph/messenger.c
deleted file mode 100644
index 17a09b32a591..000000000000
--- a/fs/ceph/messenger.c
+++ /dev/null
@@ -1,2432 +0,0 @@
-#include "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 "super.h"
-#include "messenger.h"
-#include "decode.h"
-#include "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 *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:
-		sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
-	}
-
-	return s;
-}
-
-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 __init ceph_msgr_init(void)
-{
-	ceph_msgr_wq = create_workqueue("ceph-msgr");
-	if (IS_ERR(ceph_msgr_wq)) {
-		int ret = PTR_ERR(ceph_msgr_wq);
-		pr_err("msgr_init failed to create workqueue: %d\n", ret);
-		ceph_msgr_wq = NULL;
-		return ret;
-	}
-	return 0;
-}
-
-void ceph_msgr_exit(void)
-{
-	destroy_workqueue(ceph_msgr_wq);
-}
-
-void ceph_msgr_flush(void)
-{
-	flush_workqueue(ceph_msgr_wq);
-}
-
-
-/*
- * 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", 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",
-		     pr_addr(&con->peer_addr.in_addr),
-		     sock->sk->sk_state);
-		ret = 0;
-	}
-	if (ret < 0) {
-		pr_err("connect %s error %d\n",
-		       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 };
-
-	return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
-}
-
-/*
- * 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 };
-
-	if (more)
-		msg.msg_flags |= MSG_MORE;
-	else
-		msg.msg_flags |= MSG_EOR;  /* superfluous, but what the hell */
-
-	return kernel_sendmsg(sock, &msg, iov, kvlen, len);
-}
-
-
-/*
- * 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->out_keepalive_pending = false;
-	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, 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);
-}
-
-/*
- * 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, 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);
-}
-
-/*
- * 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);
-}
-
-
-/*
- * 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;
-	if (test_bit(LOSSYTX, &con->state)) {
-		list_del_init(&m->list_head);
-	} else {
-		/* 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 =
-				le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
-		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 void 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);
-
-	con->out_connect.authorizer_protocol = cpu_to_le32(auth_protocol);
-	con->out_connect.authorizer_len = cpu_to_le32(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;
-}
-
-/*
- * 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 void 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(CEPH_FEATURE_SUPPORTED);
-	con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
-	con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
-	con->out_connect.global_seq = cpu_to_le32(global_seq);
-	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);
-
-	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 <= 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",
-		       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);
-	case AF_INET6:
-		((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
-	}
-}
-
-/*
- * 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", 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;
-}
-
-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",
-			   pr_addr(&con->peer_addr.in_addr),
-			   (int)le32_to_cpu(con->peer_addr.nonce),
-			   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",
-		     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 = CEPH_FEATURE_SUPPORTED;
-	u64 req_feat = CEPH_FEATURE_REQUIRED;
-	u64 server_feat = le64_to_cpu(con->in_reply.features);
-
-	dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
-
-	switch (con->in_reply.tag) {
-	case CEPH_MSGR_TAG_FEATURES:
-		pr_err("%s%lld %s feature set mismatch,"
-		       " my %llx < server's %llx, missing %llx\n",
-		       ENTITY_NAME(con->peer_name),
-		       pr_addr(&con->peer_addr.in_addr),
-		       sup_feat, server_feat, server_feat & ~sup_feat);
-		con->error_msg = "missing required protocol features";
-		fail_protocol(con);
-		return -1;
-
-	case CEPH_MSGR_TAG_BADPROTOVER:
-		pr_err("%s%lld %s protocol version mismatch,"
-		       " my %d != server's %d\n",
-		       ENTITY_NAME(con->peer_name),
-		       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";
-			reset_connection(con);
-			set_bit(CLOSED, &con->state);
-			return -1;
-		}
-		con->auth_retry = 1;
-		prepare_write_connect(con->msgr, con, 0);
-		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),
-		       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);
-		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),
-			       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 peer connecting WAIT\n");
-
-	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);
-		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, data_off;
-	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;
-	data_off = le16_to_cpu(con->in_hdr.data_off);
-
-	/* 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),
-			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;
-		con->in_seq++;
-		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 = data_off & ~PAGE_MASK;
-		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) {
-		/*
-		 * if we were STANDBY and are reconnecting _this_
-		 * connection, bump connect_seq now.  Always bump
-		 * global_seq.
-		 */
-		if (test_and_clear_bit(STANDBY, &con->state))
-			con->connect_seq++;
-
-		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 done;
-		if (ret < 0) {
-			dout("try_write write_partial_skip err %d\n", ret);
-			goto done;
-		}
-	}
-	if (con->out_kvec_left) {
-		ret = write_partial_kvec(con);
-		if (ret <= 0)
-			goto done;
-	}
-
-	/* 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 done;
-		if (ret < 0) {
-			dout("try_write write_partial_msg_pages err %d\n",
-			     ret);
-			goto done;
-		}
-	}
-
-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");
-done:
-	ret = 0;
-out:
-	dout("try_write done on %p\n", con);
-	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);
-	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 done;
-			if (process_banner(con) < 0) {
-				ret = -1;
-				goto out;
-			}
-		}
-		ret = read_partial_connect(con);
-		if (ret <= 0)
-			goto done;
-		if (process_connect(con) < 0) {
-			ret = -1;
-			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 done;
-		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 done;
-		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 done;
-		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;
-				goto out;
-			case -EIO:
-				con->error_msg = "io error";
-				goto out;
-			default:
-				goto done;
-			}
-		}
-		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 done;
-		process_ack(con);
-		goto more;
-	}
-
-done:
-	ret = 0;
-out:
-	dout("try_read done on %p\n", con);
-	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.
- *
- * There is some trickery going on with QUEUED and BUSY because we
- * only want a _single_ thread operating on each connection at any
- * point in time, but we want to use all available CPUs.
- *
- * The worker thread only proceeds if it can atomically set BUSY.  It
- * clears QUEUED and does it's thing.  When it thinks it's done, it
- * clears BUSY, then rechecks QUEUED.. if it's set again, it loops
- * (tries again to set BUSY).
- *
- * To queue work, we first set QUEUED, _then_ if BUSY isn't set, we
- * try to queue work.  If that fails (work is already queued, or BUSY)
- * we give up (work also already being done or is queued) but leave QUEUED
- * set so that the worker thread will loop if necessary.
- */
-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;
-	}
-
-	set_bit(QUEUED, &con->state);
-	if (test_bit(BUSY, &con->state)) {
-		dout("queue_con %p - already BUSY\n", con);
-		con->ops->put(con);
-	} else if (!queue_work(ceph_msgr_wq, &con->work.work)) {
-		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 backoff = 0;
-
-more:
-	if (test_and_set_bit(BUSY, &con->state) != 0) {
-		dout("con_work %p BUSY already set\n", con);
-		goto out;
-	}
-	dout("con_work %p start, clearing QUEUED\n", con);
-	clear_bit(QUEUED, &con->state);
-
-	mutex_lock(&con->mutex);
-
-	if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
-		dout("con_work CLOSED\n");
-		con_close_socket(con);
-		goto done;
-	}
-	if (test_and_clear_bit(OPENING, &con->state)) {
-		/* reopen w/ new peer */
-		dout("con_work OPENING\n");
-		con_close_socket(con);
-	}
-
-	if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
-	    try_read(con) < 0 ||
-	    try_write(con) < 0) {
-		mutex_unlock(&con->mutex);
-		backoff = 1;
-		ceph_fault(con);     /* error/fault path */
-		goto done_unlocked;
-	}
-
-done:
-	mutex_unlock(&con->mutex);
-
-done_unlocked:
-	clear_bit(BUSY, &con->state);
-	dout("con->state=%lu\n", con->state);
-	if (test_bit(QUEUED, &con->state)) {
-		if (!backoff || test_bit(OPENING, &con->state)) {
-			dout("con_work %p QUEUED reset, looping\n", con);
-			goto more;
-		}
-		dout("con_work %p QUEUED reset, but just faulted\n", con);
-		clear_bit(QUEUED, &con->state);
-	}
-	dout("con_work %p done\n", con);
-
-out:
-	con->ops->put(con);
-}
-
-
-/*
- * Generic error/fault handler.  A retry mechanism is used with
- * exponential backoff
- */
-static void ceph_fault(struct ceph_connection *con)
-{
-	pr_err("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
-	       pr_addr(&con->peer_addr.in_addr), con->error_msg);
-	dout("fault %p state %lu to peer %s\n",
-	     con, con->state, 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;
-
-	con_close_socket(con);
-
-	if (con->in_msg) {
-		ceph_msg_put(con->in_msg);
-		con->in_msg = NULL;
-	}
-
-	/* Requeue anything that hasn't been acked */
-	list_splice_init(&con->out_sent, &con->out_queue);
-
-	/* If there are no messages in the queue, place the connection
-	 * in a STANDBY state (i.e., don't try to reconnect just yet). */
-	if (list_empty(&con->out_queue) && !con->out_keepalive_pending) {
-		dout("fault setting STANDBY\n");
-		set_bit(STANDBY, &con->state);
-	} else {
-		/* retry after a delay. */
-		if (con->delay == 0)
-			con->delay = BASE_DELAY_INTERVAL;
-		else if (con->delay < MAX_DELAY_INTERVAL)
-			con->delay *= 2;
-		dout("fault queueing %p delay %lu\n", con, con->delay);
-		con->ops->get(con);
-		if (queue_delayed_work(ceph_msgr_wq, &con->work,
-				       round_jiffies_relative(con->delay)) == 0)
-			con->ops->put(con);
-	}
-
-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.
-	 */
-	if (con->auth_retry && con->ops->invalidate_authorizer) {
-		dout("calling invalidate_authorizer()\n");
-		con->ops->invalidate_authorizer(con);
-	}
-
-	if (con->ops->fault)
-		con->ops->fault(con);
-}
-
-
-
-/*
- * create a new messenger instance
- */
-struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
-{
-	struct ceph_messenger *msgr;
-
-	msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
-	if (msgr == NULL)
-		return ERR_PTR(-ENOMEM);
-
-	spin_lock_init(&msgr->global_seq_lock);
-
-	/* the zero page is needed if a request is "canceled" while the message
-	 * is being written over the socket */
-	msgr->zero_page = __page_cache_alloc(GFP_KERNEL | __GFP_ZERO);
-	if (!msgr->zero_page) {
-		kfree(msgr);
-		return ERR_PTR(-ENOMEM);
-	}
-	kmap(msgr->zero_page);
-
-	if (myaddr)
-		msgr->inst.addr = *myaddr;
-
-	/* select a random nonce */
-	msgr->inst.addr.type = 0;
-	get_random_bytes(&msgr->inst.addr.nonce, sizeof(msgr->inst.addr.nonce));
-	encode_my_addr(msgr);
-
-	dout("messenger_create %p\n", msgr);
-	return msgr;
-}
-
-void ceph_messenger_destroy(struct ceph_messenger *msgr)
-{
-	dout("destroy %p\n", msgr);
-	kunmap(msgr->zero_page);
-	__free_page(msgr->zero_page);
-	kfree(msgr);
-	dout("destroyed messenger %p\n", msgr);
-}
-
-/*
- * Queue up an outgoing message on the given connection.
- */
-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);
-	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,
-	     ENTITY_NAME(con->peer_name), 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.middle_len),
-	     le32_to_cpu(msg->hdr.data_len));
-	mutex_unlock(&con->mutex);
-
-	/* if there wasn't anything waiting to send before, queue
-	 * new work */
-	if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
-		queue_con(con);
-}
-
-/*
- * Revoke a message that was previously queued for send
- */
-void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg)
-{
-	mutex_lock(&con->mutex);
-	if (!list_empty(&msg->list_head)) {
-		dout("con_revoke %p msg %p - was on queue\n", con, msg);
-		list_del_init(&msg->list_head);
-		ceph_msg_put(msg);
-		msg->hdr.seq = 0;
-	}
-	if (con->out_msg == msg) {
-		dout("con_revoke %p msg %p - was sending\n", 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;
-	}
-	mutex_unlock(&con->mutex);
-}
-
-/*
- * Revoke a message that we may be reading data into
- */
-void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
-{
-	mutex_lock(&con->mutex);
-	if (con->in_msg && con->in_msg == msg) {
-		unsigned front_len = le32_to_cpu(con->in_hdr.front_len);
-		unsigned middle_len = le32_to_cpu(con->in_hdr.middle_len);
-		unsigned 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 -
-				sizeof(struct ceph_msg_header) -
-				front_len -
-				middle_len -
-				data_len -
-				sizeof(struct ceph_msg_footer);
-		ceph_msg_put(con->in_msg);
-		con->in_msg = NULL;
-		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);
-	}
-	mutex_unlock(&con->mutex);
-}
-
-/*
- * Queue a keepalive byte to ensure the tcp connection is alive.
- */
-void ceph_con_keepalive(struct ceph_connection *con)
-{
-	if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
-	    test_and_set_bit(WRITE_PENDING, &con->state) == 0)
-		queue_con(con);
-}
-
-
-/*
- * construct a new message with given type, size
- * the new msg has a ref count of 1.
- */
-struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags)
-{
-	struct ceph_msg *m;
-
-	m = kmalloc(sizeof(*m), flags);
-	if (m == NULL)
-		goto out;
-	kref_init(&m->kref);
-	INIT_LIST_HEAD(&m->list_head);
-
-	m->hdr.tid = 0;
-	m->hdr.type = cpu_to_le16(type);
-	m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
-	m->hdr.version = 0;
-	m->hdr.front_len = cpu_to_le32(front_len);
-	m->hdr.middle_len = 0;
-	m->hdr.data_len = 0;
-	m->hdr.data_off = 0;
-	m->hdr.reserved = 0;
-	m->footer.front_crc = 0;
-	m->footer.middle_crc = 0;
-	m->footer.data_crc = 0;
-	m->footer.flags = 0;
-	m->front_max = front_len;
-	m->front_is_vmalloc = false;
-	m->more_to_follow = false;
-	m->pool = NULL;
-
-	/* front */
-	if (front_len) {
-		if (front_len > PAGE_CACHE_SIZE) {
-			m->front.iov_base = __vmalloc(front_len, flags,
-						      PAGE_KERNEL);
-			m->front_is_vmalloc = true;
-		} else {
-			m->front.iov_base = kmalloc(front_len, flags);
-		}
-		if (m->front.iov_base == NULL) {
-			pr_err("msg_new can't allocate %d bytes\n",
-			     front_len);
-			goto out2;
-		}
-	} else {
-		m->front.iov_base = NULL;
-	}
-	m->front.iov_len = front_len;
-
-	/* middle */
-	m->middle = NULL;
-
-	/* data */
-	m->nr_pages = 0;
-	m->pages = NULL;
-	m->pagelist = NULL;
-	m->bio = NULL;
-	m->bio_iter = NULL;
-	m->bio_seg = 0;
-	m->trail = NULL;
-
-	dout("ceph_msg_new %p front %d\n", m, front_len);
-	return m;
-
-out2:
-	ceph_msg_put(m);
-out:
-	pr_err("msg_new can't create type %d front %d\n", type, front_len);
-	return NULL;
-}
-
-/*
- * Allocate "middle" portion of a message, if it is needed and wasn't
- * allocated by alloc_msg.  This allows us to read a small fixed-size
- * per-type header in the front and then gracefully fail (i.e.,
- * propagate the error to the caller based on info in the front) when
- * the middle is too large.
- */
-static int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
-{
-	int type = le16_to_cpu(msg->hdr.type);
-	int middle_len = le32_to_cpu(msg->hdr.middle_len);
-
-	dout("alloc_middle %p type %d %s middle_len %d\n", msg, type,
-	     ceph_msg_type_name(type), middle_len);
-	BUG_ON(!middle_len);
-	BUG_ON(msg->middle);
-
-	msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
-	if (!msg->middle)
-		return -ENOMEM;
-	return 0;
-}
-
-/*
- * Generic message allocator, for incoming messages.
- */
-static struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con,
-				struct ceph_msg_header *hdr,
-				int *skip)
-{
-	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;
-
-	if (con->ops->alloc_msg) {
-		mutex_unlock(&con->mutex);
-		msg = con->ops->alloc_msg(con, hdr, skip);
-		mutex_lock(&con->mutex);
-		if (!msg || *skip)
-			return NULL;
-	}
-	if (!msg) {
-		*skip = 0;
-		msg = ceph_msg_new(type, front_len, GFP_NOFS);
-		if (!msg) {
-			pr_err("unable to allocate msg type %d len %d\n",
-			       type, front_len);
-			return NULL;
-		}
-	}
-	memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
-
-	if (middle_len && !msg->middle) {
-		ret = ceph_alloc_middle(con, msg);
-		if (ret < 0) {
-			ceph_msg_put(msg);
-			return NULL;
-		}
-	}
-
-	return msg;
-}
-
-
-/*
- * Free a generically kmalloc'd message.
- */
-void ceph_msg_kfree(struct ceph_msg *m)
-{
-	dout("msg_kfree %p\n", m);
-	if (m->front_is_vmalloc)
-		vfree(m->front.iov_base);
-	else
-		kfree(m->front.iov_base);
-	kfree(m);
-}
-
-/*
- * Drop a msg ref.  Destroy as needed.
- */
-void ceph_msg_last_put(struct kref *kref)
-{
-	struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
-
-	dout("ceph_msg_put last one on %p\n", m);
-	WARN_ON(!list_empty(&m->list_head));
-
-	/* drop middle, data, if any */
-	if (m->middle) {
-		ceph_buffer_put(m->middle);
-		m->middle = NULL;
-	}
-	m->nr_pages = 0;
-	m->pages = NULL;
-
-	if (m->pagelist) {
-		ceph_pagelist_release(m->pagelist);
-		kfree(m->pagelist);
-		m->pagelist = NULL;
-	}
-
-	m->trail = NULL;
-
-	if (m->pool)
-		ceph_msgpool_put(m->pool, m);
-	else
-		ceph_msg_kfree(m);
-}
-
-void ceph_msg_dump(struct ceph_msg *msg)
-{
-	pr_debug("msg_dump %p (front_max %d nr_pages %d)\n", msg,
-		 msg->front_max, msg->nr_pages);
-	print_hex_dump(KERN_DEBUG, "header: ",
-		       DUMP_PREFIX_OFFSET, 16, 1,
-		       &msg->hdr, sizeof(msg->hdr), true);
-	print_hex_dump(KERN_DEBUG, " front: ",
-		       DUMP_PREFIX_OFFSET, 16, 1,
-		       msg->front.iov_base, msg->front.iov_len, true);
-	if (msg->middle)
-		print_hex_dump(KERN_DEBUG, "middle: ",
-			       DUMP_PREFIX_OFFSET, 16, 1,
-			       msg->middle->vec.iov_base,
-			       msg->middle->vec.iov_len, true);
-	print_hex_dump(KERN_DEBUG, "footer: ",
-		       DUMP_PREFIX_OFFSET, 16, 1,
-		       &msg->footer, sizeof(msg->footer), true);
-}