--- /dev/null
+#include <linux/crc32c.h>
+#include <linux/kthread.h>
+#include <linux/socket.h>
+#include <linux/net.h>
+#include <linux/string.h>
+#include <linux/highmem.h>
+#include <linux/ctype.h>
+#include <net/tcp.h>
+
+#include "ceph_debug.h"
+int ceph_debug_msgr __read_mostly;
+#define DOUT_MASK DOUT_MASK_MSGR
+#define DOUT_VAR ceph_debug_msgr
+
+#include "super.h"
+#include "messenger.h"
+
+
+
+/* static tag bytes (protocol control messages) */
+static char tag_msg = CEPH_MSGR_TAG_MSG;
+static char tag_ack = CEPH_MSGR_TAG_ACK;
+
+
+static void ceph_queue_con(struct ceph_connection *con);
+static void con_work(struct work_struct *);
+static void ceph_fault(struct ceph_connection *con);
+
+
+/*
+ * 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 = create_workqueue("ceph-msgr");
+ if (IS_ERR(ceph_msgr_wq)) {
+ int ret = PTR_ERR(ceph_msgr_wq);
+ derr(0, "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);
+}
+
+/* from slub.c */
+static void print_section(char *text, u8 *addr, unsigned int length)
+{
+ int i, offset;
+ int newline = 1;
+ char ascii[17];
+
+ ascii[16] = 0;
+
+ for (i = 0; i < length; i++) {
+ if (newline) {
+ printk(KERN_ERR "%8s 0x%p: ", text, addr + i);
+ newline = 0;
+ }
+ printk(KERN_CONT " %02x", addr[i]);
+ offset = i % 16;
+ ascii[offset] = isgraph(addr[i]) ? addr[i] : '.';
+ if (offset == 15) {
+ printk(KERN_CONT " %s\n", ascii);
+ newline = 1;
+ }
+ }
+ if (!newline) {
+ i %= 16;
+ while (i < 16) {
+ printk(KERN_CONT " ");
+ ascii[i] = ' ';
+ i++;
+ }
+ printk(KERN_CONT " %s\n", ascii);
+ }
+}
+
+/*
+ * socket callback functions
+ */
+
+/* listen socket received a connection */
+static void ceph_accept_ready(struct sock *sk, int count_unused)
+{
+ struct ceph_messenger *msgr = (struct ceph_messenger *)sk->sk_user_data;
+
+ dout(30, "ceph_accept_ready messenger %p sk_state = %u\n",
+ msgr, sk->sk_state);
+ if (sk->sk_state == TCP_LISTEN)
+ queue_work(ceph_msgr_wq, &msgr->awork);
+}
+
+/* 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(30, "ceph_data_ready on %p state = %lu, queueing work\n",
+ con, con->state);
+ ceph_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(30, "ceph_write_space %p queueing write work\n", con);
+ ceph_queue_con(con);
+ } else {
+ dout(30, "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(30, "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(30, "ceph_state_change TCP_CLOSE\n");
+ case TCP_CLOSE_WAIT:
+ dout(30, "ceph_state_change TCP_CLOSE_WAIT\n");
+ set_bit(SOCK_CLOSED, &con->state);
+ if (test_bit(CONNECTING, &con->state))
+ con->error_msg = "connection failed";
+ else
+ con->error_msg = "socket closed";
+ ceph_queue_con(con);
+ break;
+ case TCP_ESTABLISHED:
+ dout(30, "ceph_state_change TCP_ESTABLISHED\n");
+ ceph_queue_con(con);
+ break;
+ }
+}
+
+/*
+ * set up socket callbacks
+ */
+static void listen_sock_callbacks(struct socket *sock,
+ struct ceph_messenger *msgr)
+{
+ struct sock *sk = sock->sk;
+ sk->sk_user_data = (void *)msgr;
+ sk->sk_data_ready = ceph_accept_ready;
+}
+
+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 *paddr = (struct sockaddr *)&con->peer_addr.ipaddr;
+ struct socket *sock;
+ int ret;
+
+ BUG_ON(con->sock);
+ ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (ret)
+ return ERR_PTR(ret);
+ con->sock = sock;
+ sock->sk->sk_allocation = GFP_NOFS;
+
+ set_sock_callbacks(sock, con);
+
+ dout(20, "connect %u.%u.%u.%u:%u\n",
+ IPQUADPORT(*(struct sockaddr_in *)paddr));
+
+ ret = sock->ops->connect(sock, paddr,
+ sizeof(struct sockaddr_in), O_NONBLOCK);
+ if (ret == -EINPROGRESS) {
+ dout(20, "connect %u.%u.%u.%u:%u EINPROGRESS sk_state = %u\n",
+ IPQUADPORT(*(struct sockaddr_in *)paddr),
+ sock->sk->sk_state);
+ ret = 0;
+ }
+ if (ret < 0) {
+ derr(1, "connect %u.%u.%u.%u:%u error %d\n",
+ IPQUADPORT(*(struct sockaddr_in *)paddr), ret);
+ sock_release(sock);
+ con->sock = NULL;
+ con->error_msg = "connect error";
+ }
+
+ if (ret < 0)
+ return ERR_PTR(ret);
+ return sock;
+}
+
+/*
+ * set up listening socket
+ */
+static int ceph_tcp_listen(struct ceph_messenger *msgr)
+{
+ int ret;
+ int optval = 1;
+ struct sockaddr_in *myaddr = &msgr->inst.addr.ipaddr;
+ int nlen;
+ struct socket *sock;
+
+ ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (ret)
+ return ret;
+ sock->sk->sk_allocation = GFP_NOFS;
+ ret = kernel_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR,
+ (char *)&optval, sizeof(optval));
+ if (ret < 0) {
+ derr(0, "failed to set SO_REUSEADDR: %d\n", ret);
+ goto err;
+ }
+
+ ret = sock->ops->bind(sock, (struct sockaddr *)myaddr,
+ sizeof(*myaddr));
+ if (ret < 0) {
+ derr(0, "Failed to bind: %d\n", ret);
+ goto err;
+ }
+
+ /* what port did we bind to? */
+ nlen = sizeof(*myaddr);
+ ret = sock->ops->getname(sock, (struct sockaddr *)myaddr, &nlen,
+ 0);
+ if (ret < 0) {
+ derr(0, "failed to getsockname: %d\n", ret);
+ goto err;
+ }
+ dout(0, "listening on %u.%u.%u.%u:%u\n", IPQUADPORT(*myaddr));
+
+ /* we don't care too much if this works or not */
+ sock->ops->listen(sock, CEPH_MSGR_BACKUP);
+
+ /* ok! */
+ msgr->listen_sock = sock;
+ listen_sock_callbacks(sock, msgr);
+ return 0;
+
+err:
+ sock_release(sock);
+ return ret;
+}
+
+/*
+ * accept a connection
+ */
+static int ceph_tcp_accept(struct socket *lsock, struct ceph_connection *con)
+{
+ struct socket *sock;
+ int ret;
+
+ ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
+ if (ret)
+ return ret;
+ con->sock = sock;
+ sock->sk->sk_allocation = GFP_NOFS;
+
+ ret = lsock->ops->accept(lsock, sock, O_NONBLOCK);
+ if (ret < 0) {
+ derr(0, "accept error: %d\n", ret);
+ goto err;
+ }
+
+ sock->ops = lsock->ops;
+ sock->type = lsock->type;
+ set_sock_callbacks(sock, con);
+ return ret;
+
+err:
+ sock->ops->shutdown(sock, SHUT_RDWR);
+ sock_release(sock);
+ return ret;
+}
+
+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);
+}
+
+
+/*
+ * create a new connection.
+ */
+static struct ceph_connection *new_connection(struct ceph_messenger *msgr)
+{
+ struct ceph_connection *con;
+
+ con = kzalloc(sizeof(struct ceph_connection), GFP_NOFS);
+ if (con == NULL)
+ return NULL;
+ con->msgr = msgr;
+ atomic_set(&con->nref, 1);
+ INIT_LIST_HEAD(&con->list_all);
+ INIT_LIST_HEAD(&con->list_bucket);
+ spin_lock_init(&con->out_queue_lock);
+ INIT_LIST_HEAD(&con->out_queue);
+ INIT_LIST_HEAD(&con->out_sent);
+ INIT_DELAYED_WORK(&con->work, con_work);
+
+ dout(20, "new connection: %p\n", con);
+ return con;
+}
+
+/*
+ * The con_tree radix_tree has an unsigned long key and void * value.
+ * Since ceph_entity_addr is bigger than that, we use a trivial hash
+ * key, and point to a list_head in ceph_connection, as you would with
+ * a hash table. If the trivial hash collides, we just traverse the
+ * (hopefully short) list until we find what we want.
+ */
+static unsigned long hash_addr(struct ceph_entity_addr *addr)
+{
+ unsigned long key;
+
+ key = *(u32 *)&addr->ipaddr.sin_addr.s_addr;
+ key ^= *(u16 *)&addr->ipaddr.sin_port;
+ return key;
+}
+
+/*
+ * Get an existing connection, if any, for given addr. Note that we
+ * may need to traverse the list_bucket list, which has to "head."
+ *
+ * called under con_lock.
+ */
+static struct ceph_connection *__get_connection(struct ceph_messenger *msgr,
+ struct ceph_entity_addr *addr)
+{
+ struct ceph_connection *con = NULL;
+ struct list_head *head, *p;
+ unsigned long key = hash_addr(addr);
+
+ head = radix_tree_lookup(&msgr->con_tree, key);
+ if (head == NULL)
+ return NULL;
+ con = list_entry(head, struct ceph_connection, list_bucket);
+ if (memcmp(&con->peer_addr, addr, sizeof(addr)) == 0)
+ goto yes;
+ list_for_each(p, head) {
+ con = list_entry(p, struct ceph_connection, list_bucket);
+ if (memcmp(&con->peer_addr, addr, sizeof(addr)) == 0)
+ goto yes;
+ }
+ return NULL;
+
+yes:
+ atomic_inc(&con->nref);
+ dout(20, "get_connection %p nref = %d -> %d\n", con,
+ atomic_read(&con->nref) - 1, atomic_read(&con->nref));
+ return con;
+}
+
+
+/*
+ * Shutdown/close the socket for the given connection.
+ */
+static int con_close_socket(struct ceph_connection *con)
+{
+ int rc;
+
+ dout(10, "con_close_socket on %p sock %p\n", con, con->sock);
+ if (!con->sock)
+ return 0;
+ rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
+ sock_release(con->sock);
+ con->sock = NULL;
+ return rc;
+}
+
+/*
+ * drop a reference
+ */
+static void put_connection(struct ceph_connection *con)
+{
+ dout(20, "put_connection %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)) {
+ dout(20, "put_connection %p destroying\n", con);
+ ceph_msg_put_list(&con->out_queue);
+ ceph_msg_put_list(&con->out_sent);
+ set_bit(CLOSED, &con->state);
+ con_close_socket(con); /* silently ignore possible errors */
+ kfree(con);
+ }
+}
+
+/*
+ * add a connection to the con_tree.
+ *
+ * called under con_lock.
+ */
+static int __register_connection(struct ceph_messenger *msgr,
+ struct ceph_connection *con)
+{
+ struct list_head *head;
+ unsigned long key = hash_addr(&con->peer_addr);
+ int rc = 0;
+
+ dout(20, "register_connection %p %d -> %d\n", con,
+ atomic_read(&con->nref), atomic_read(&con->nref) + 1);
+ atomic_inc(&con->nref);
+
+ /* if were just ACCEPTING this connection, it is already on the
+ * con_all and con_accepting lists. */
+ if (test_and_clear_bit(ACCEPTING, &con->state)) {
+ list_del_init(&con->list_bucket);
+ put_connection(con);
+ } else {
+ list_add(&con->list_all, &msgr->con_all);
+ }
+
+ head = radix_tree_lookup(&msgr->con_tree, key);
+ if (head) {
+ dout(20, "register_connection %p in old bucket %lu head %p\n",
+ con, key, head);
+ list_add(&con->list_bucket, head);
+ } else {
+ dout(20, "register_connection %p in new bucket %lu head %p\n",
+ con, key, &con->list_bucket);
+ INIT_LIST_HEAD(&con->list_bucket); /* empty */
+ rc = radix_tree_insert(&msgr->con_tree, key, &con->list_bucket);
+ if (rc < 0) {
+ list_del(&con->list_all);
+ put_connection(con);
+ return rc;
+ }
+ }
+ set_bit(REGISTERED, &con->state);
+ return 0;
+}
+
+/*
+ * called under con_lock.
+ */
+static void add_connection_accepting(struct ceph_messenger *msgr,
+ struct ceph_connection *con)
+{
+ dout(20, "add_connection_accepting %p nref = %d -> %d\n", con,
+ atomic_read(&con->nref), atomic_read(&con->nref) + 1);
+ atomic_inc(&con->nref);
+ spin_lock(&msgr->con_lock);
+ list_add(&con->list_all, &msgr->con_all);
+ spin_unlock(&msgr->con_lock);
+}
+
+/*
+ * Remove connection from all list. Also, from con_tree, if it should
+ * have been there.
+ *
+ * called under con_lock.
+ */
+static void __remove_connection(struct ceph_messenger *msgr,
+ struct ceph_connection *con)
+{
+ unsigned long key;
+ void **slot, *val;
+
+ dout(0, "__remove_connection: %p\n", con);
+ dout(20, "__remove_connection %p\n", con);
+ if (list_empty(&con->list_all)) {
+ dout(20, "__remove_connection %p not registered\n", con);
+ return;
+ }
+ list_del_init(&con->list_all);
+ if (test_bit(REGISTERED, &con->state)) {
+ key = hash_addr(&con->peer_addr);
+ if (list_empty(&con->list_bucket)) {
+ /* last one in this bucket */
+ dout(20, "__remove_connection %p and bucket %lu\n",
+ con, key);
+ radix_tree_delete(&msgr->con_tree, key);
+ } else {
+ /* if we share this bucket, and the radix tree points
+ * to us, adjust it to point to the next guy. */
+ slot = radix_tree_lookup_slot(&msgr->con_tree, key);
+ val = radix_tree_deref_slot(slot);
+ dout(20, "__remove_connection %p from bucket %lu "
+ "head %p\n", con, key, val);
+ if (val == &con->list_bucket) {
+ dout(20, "__remove_connection adjusting bucket"
+ " for %lu to next item, %p\n", key,
+ con->list_bucket.next);
+ radix_tree_replace_slot(slot,
+ con->list_bucket.next);
+ }
+ list_del_init(&con->list_bucket);
+ }
+ }
+ if (test_and_clear_bit(ACCEPTING, &con->state))
+ list_del_init(&con->list_bucket);
+ put_connection(con);
+}
+
+static void remove_connection(struct ceph_messenger *msgr,
+ struct ceph_connection *con)
+{
+ spin_lock(&msgr->con_lock);
+ __remove_connection(msgr, con);
+ spin_unlock(&msgr->con_lock);
+}
+
+/*
+ * replace another connection
+ * (old and new should be for the _same_ peer,
+ * and thus in the same bucket in the radix tree)
+ */
+static void __replace_connection(struct ceph_messenger *msgr,
+ struct ceph_connection *old,
+ struct ceph_connection *new)
+{
+ unsigned long key = hash_addr(&new->peer_addr);
+ void **slot;
+
+ dout(0, "replace_connection %p with %p\n", old, new);
+ dout(10, "replace_connection %p with %p\n", old, new);
+
+ /* replace in con_tree */
+ slot = radix_tree_lookup_slot(&msgr->con_tree, key);
+ if (*slot == &old->list_bucket)
+ radix_tree_replace_slot(slot, &new->list_bucket);
+ else
+ BUG_ON(list_empty(&old->list_bucket));
+ if (!list_empty(&old->list_bucket)) {
+ /* replace old with new in bucket list */
+ list_add(&new->list_bucket, &old->list_bucket);
+ list_del_init(&old->list_bucket);
+ }
+
+ /* take old connections message queue */
+ spin_lock(&old->out_queue_lock);
+ if (!list_empty(&old->out_queue))
+ list_splice_init(&new->out_queue, &old->out_queue);
+ spin_unlock(&old->out_queue_lock);
+
+ new->connect_seq = le32_to_cpu(new->in_connect.connect_seq);
+ new->out_seq = old->out_seq;
+ new->peer_name = old->peer_name;
+
+ set_bit(CLOSED, &old->state);
+ put_connection(old); /* dec reference count */
+
+ clear_bit(ACCEPTING, &new->state);
+}
+
+
+
+
+/*
+ * 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(10, "prepare_write_message_footer %p\n", con);
+ 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 = NULL; /* we're done with this one */
+}
+
+/*
+ * 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;
+
+ /* 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_le32(con->in_seq_acked);
+ con->out_kvec[v].iov_base = &con->out_temp_ack;
+ con->out_kvec[v++].iov_len = 4;
+ con->out_kvec_bytes = 1 + 4;
+ }
+
+ /* move message to sending/sent list */
+ m = list_first_entry(&con->out_queue,
+ struct ceph_msg, list_head);
+ list_move_tail(&m->list_head, &con->out_sent);
+ con->out_msg = m; /* we don't bother taking a reference here. */
+
+ dout(20, "prepare_write_message %p seq %lld type %d len %d+%d %d pgs\n",
+ m, le64_to_cpu(m->hdr.seq), le16_to_cpu(m->hdr.type),
+ le32_to_cpu(m->hdr.front_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 */
+ 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;
+ con->out_kvec_left = v;
+ con->out_kvec_bytes += 1 + sizeof(m->hdr) + m->front.iov_len;
+ 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 = 0;
+ con->out_msg->footer.front_crc =
+ cpu_to_le32(crc32c(0, m->front.iov_base, m->front.iov_len));
+ con->out_msg->footer.data_crc = 0;
+
+ /* is there a data payload? */
+ if (le32_to_cpu(m->hdr.data_len) > 0) {
+ /* initialize page iterator */
+ con->out_msg_pos.page = 0;
+ con->out_msg_pos.page_pos =
+ le16_to_cpu(m->hdr.data_off) & ~PAGE_MASK;
+ 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(20, "prepare_write_ack %p %u -> %u\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_le32(con->in_seq_acked);
+ con->out_kvec[1].iov_base = &con->out_temp_ack;
+ con->out_kvec[1].iov_len = 4;
+ con->out_kvec_left = 2;
+ con->out_kvec_bytes = 1 + 4;
+ con->out_kvec_cur = con->out_kvec;
+ con->out_more = 1; /* more will follow.. eventually.. */
+ set_bit(WRITE_PENDING, &con->state);
+}
+
+/*
+ * Connection negotiation.
+ */
+
+/*
+ * We connected to a peer and are saying hello.
+ */
+static void prepare_write_connect(struct ceph_messenger *msgr,
+ struct ceph_connection *con)
+{
+ int len = strlen(CEPH_BANNER);
+
+ dout(10, "prepare_write_connect %p\n", con);
+ 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(get_global_seq(con->msgr, 0));
+ con->out_connect.flags = 0;
+ if (test_bit(LOSSYTX, &con->state))
+ con->out_connect.flags = CEPH_MSG_CONNECT_LOSSY;
+
+ con->out_kvec[0].iov_base = CEPH_BANNER;
+ con->out_kvec[0].iov_len = len;
+ con->out_kvec[1].iov_base = &msgr->inst.addr;
+ con->out_kvec[1].iov_len = sizeof(msgr->inst.addr);
+ con->out_kvec[2].iov_base = &con->out_connect;
+ con->out_kvec[2].iov_len = sizeof(con->out_connect);
+ con->out_kvec_left = 3;
+ con->out_kvec_bytes = len + sizeof(msgr->inst.addr) +
+ sizeof(con->out_connect);
+ con->out_kvec_cur = con->out_kvec;
+ con->out_more = 0;
+ set_bit(WRITE_PENDING, &con->state);
+}
+
+static void prepare_write_connect_retry(struct ceph_messenger *msgr,
+ struct ceph_connection *con)
+{
+ dout(10, "prepare_write_connect_retry %p\n", con);
+ con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
+ con->out_connect.global_seq =
+ cpu_to_le32(get_global_seq(con->msgr, 0));
+
+ con->out_kvec[0].iov_base = &con->out_connect;
+ con->out_kvec[0].iov_len = sizeof(con->out_connect);
+ con->out_kvec_left = 1;
+ 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);
+}
+
+/*
+ * We accepted a connection and are saying hello.
+ */
+static void prepare_write_accept_hello(struct ceph_messenger *msgr,
+ struct ceph_connection *con)
+{
+ int len = strlen(CEPH_BANNER);
+
+ dout(10, "prepare_write_accept_hello %p\n", con);
+ con->out_kvec[0].iov_base = CEPH_BANNER;
+ con->out_kvec[0].iov_len = len;
+ con->out_kvec[1].iov_base = &msgr->inst.addr;
+ con->out_kvec[1].iov_len = sizeof(msgr->inst.addr);
+ con->out_kvec_left = 2;
+ con->out_kvec_bytes = len + sizeof(msgr->inst.addr);
+ con->out_kvec_cur = con->out_kvec;
+ con->out_more = 0;
+ set_bit(WRITE_PENDING, &con->state);
+}
+
+/*
+ * Reply to a connect attempt, indicating whether the negotiation has
+ * succeeded or must continue.
+ */
+static void prepare_write_accept_reply(struct ceph_connection *con, bool retry)
+{
+ dout(10, "prepare_write_accept_reply %p\n", con);
+ con->out_reply.flags = 0;
+ if (test_bit(LOSSYTX, &con->state))
+ con->out_reply.flags = CEPH_MSG_CONNECT_LOSSY;
+
+ con->out_kvec[0].iov_base = &con->out_reply;
+ con->out_kvec[0].iov_len = sizeof(con->out_reply);
+ con->out_kvec_left = 1;
+ con->out_kvec_bytes = sizeof(con->out_reply);
+ con->out_kvec_cur = con->out_kvec;
+ con->out_more = 0;
+ set_bit(WRITE_PENDING, &con->state);
+
+ if (retry)
+ /* we'll re-read the connect request, sans the hello + addr */
+ con->in_base_pos = strlen(CEPH_BANNER) +
+ sizeof(con->msgr->inst.addr);
+}
+
+
+
+/*
+ * 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(10, "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;
+ ret = 1;
+out:
+ dout(30, "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! */
+}
+
+/*
+ * 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_client *client = con->msgr->parent;
+ struct ceph_msg *msg = con->out_msg;
+ unsigned data_len = le32_to_cpu(msg->hdr.data_len);
+ size_t len;
+ int crc = !ceph_test_opt(client, NOCRC);
+ int ret;
+
+ dout(30, "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);
+
+ while (con->out_msg_pos.page < con->out_msg->nr_pages) {
+ struct page *page = NULL;
+ void *kaddr = NULL;
+
+ /*
+ * 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.
+ */
+ mutex_lock(&msg->page_mutex);
+ if (msg->pages) {
+ page = msg->pages[con->out_msg_pos.page];
+ if (crc)
+ kaddr = kmap(page);
+ } else {
+ page = con->msgr->zero_page;
+ if (crc)
+ kaddr = page_address(con->msgr->zero_page);
+ }
+ len = min((int)(PAGE_SIZE - con->out_msg_pos.page_pos),
+ (int)(data_len - con->out_msg_pos.data_pos));
+ 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);
+
+ 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, len,
+ MSG_DONTWAIT | MSG_NOSIGNAL |
+ MSG_MORE);
+
+ if (crc && msg->pages)
+ kunmap(page);
+
+ mutex_unlock(&msg->page_mutex);
+ 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;
+ }
+ }
+
+ dout(30, "write_partial_msg_pages %p msg %p done\n", con, msg);
+
+ /* prepare and queue up footer, too */
+ if (!crc)
+ con->out_msg->footer.flags |=
+ cpu_to_le32(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;
+}
+
+
+
+/*
+ * Prepare to read connection handshake, or an ack.
+ */
+static void prepare_read_connect(struct ceph_connection *con)
+{
+ dout(10, "prepare_read_connect %p\n", con);
+ con->in_base_pos = 0;
+}
+
+static void prepare_read_ack(struct ceph_connection *con)
+{
+ dout(10, "prepare_read_ack %p\n", con);
+ con->in_base_pos = 0;
+}
+
+static void prepare_read_tag(struct ceph_connection *con)
+{
+ dout(10, "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)
+{
+ int err;
+
+ dout(10, "prepare_read_message %p\n", con);
+ con->in_base_pos = 0;
+ BUG_ON(con->in_msg != NULL);
+ con->in_msg = ceph_msg_new(0, 0, 0, 0, NULL);
+ if (IS_ERR(con->in_msg)) {
+ err = PTR_ERR(con->in_msg);
+ con->in_msg = NULL;
+ con->error_msg = "out of memory for incoming message";
+ return err;
+ }
+ con->in_front_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_connect(struct ceph_connection *con)
+{
+ int ret, to = 0;
+
+ dout(20, "read_partial_connect %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->in_reply), &con->in_reply);
+ if (ret <= 0)
+ goto out;
+
+ dout(20, "read_partial_connect %p connect_seq = %u, global_seq = %u\n",
+ con, 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))) {
+ derr(10, "connection to/from %u.%u.%u.%u:%u has bad banner\n",
+ IPQUADPORT(con->peer_addr.ipaddr));
+ con->error_msg = "protocol error, bad banner";
+ return -1;
+ }
+ return 0;
+}
+
+/*
+ * Reset a connection. Discard all incoming and outgoing messages
+ * and clear *_seq state.
+ */
+static void reset_connection(struct ceph_connection *con)
+{
+ derr(1, "%s%d %u.%u.%u.%u:%u connection reset\n",
+ ENTITY_NAME(con->peer_name),
+ IPQUADPORT(con->peer_addr.ipaddr));
+
+ /* reset connection, out_queue, msg_ and connect_seq */
+ /* discard existing out_queue and msg_seq */
+ spin_lock(&con->out_queue_lock);
+ ceph_msg_put_list(&con->out_queue);
+ ceph_msg_put_list(&con->out_sent);
+
+ con->connect_seq = 0;
+ con->out_seq = 0;
+ con->out_msg = NULL;
+ con->in_seq = 0;
+ con->in_msg = NULL;
+ spin_unlock(&con->out_queue_lock);
+}
+
+
+static int process_connect(struct ceph_connection *con)
+{
+ dout(20, "process_connect on %p tag %d\n", con, (int)con->in_tag);
+
+ if (verify_hello(con) < 0)
+ return -1;
+
+ /*
+ * 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 (!ceph_entity_addr_is_local(&con->peer_addr,
+ &con->actual_peer_addr) &&
+ !(con->actual_peer_addr.ipaddr.sin_addr.s_addr == 0 &&
+ con->actual_peer_addr.ipaddr.sin_port ==
+ con->peer_addr.ipaddr.sin_port &&
+ con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
+ derr(1, "process_connect wrong peer, want %u.%u.%u.%u:%u/%d, "
+ "got %u.%u.%u.%u:%u/%d, wtf\n",
+ IPQUADPORT(con->peer_addr.ipaddr),
+ con->peer_addr.nonce,
+ IPQUADPORT(con->actual_peer_addr.ipaddr),
+ con->actual_peer_addr.nonce);
+ con->error_msg = "protocol error, wrong peer";
+ return -1;
+ }
+
+ switch (con->in_reply.tag) {
+ 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(10, "process_connect got RESET peer seq %u\n",
+ le32_to_cpu(con->in_connect.connect_seq));
+ reset_connection(con);
+ prepare_write_connect_retry(con->msgr, con);
+ prepare_read_connect(con);
+
+ /* Tell ceph about it. */
+ con->msgr->peer_reset(con->msgr->parent, &con->peer_addr,
+ &con->peer_name);
+ 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(10,
+ "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_retry(con->msgr, con);
+ 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(10,
+ "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_retry(con->msgr, con);
+ prepare_read_connect(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. We will keep
+ * our queued messages, in expectation of being replaced by an
+ * incoming connection.
+ */
+ dout(10, "process_connect peer connecting WAIT\n");
+ set_bit(WAIT, &con->state);
+ con_close_socket(con);
+ break;
+
+ case CEPH_MSGR_TAG_READY:
+ clear_bit(CONNECTING, &con->state);
+ if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
+ set_bit(LOSSYRX, &con->state);
+ con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
+ con->connect_seq++;
+ dout(10, "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));
+
+ con->delay = 0; /* reset backoff memory */
+ prepare_read_tag(con);
+ break;
+
+ default:
+ derr(1, "process_connect protocol error, will retry\n");
+ con->error_msg = "protocol error, garbage tag during connect";
+ return -1;
+ }
+ return 0;
+}
+
+
+/*
+ * Read all or part of the accept-side handshake on a newly accepted
+ * connection.
+ */
+static int read_partial_accept(struct ceph_connection *con)
+{
+ int ret;
+ int to = 0;
+
+ /* banner */
+ ret = read_partial(con, &to, strlen(CEPH_BANNER), con->in_banner);
+ if (ret <= 0)
+ return ret;
+ ret = read_partial(con, &to, sizeof(con->peer_addr), &con->peer_addr);
+ if (ret <= 0)
+ return ret;
+ ret = read_partial(con, &to, sizeof(con->in_connect), &con->in_connect);
+ if (ret <= 0)
+ return ret;
+ return 1;
+}
+
+/*
+ * Call after a new connection's handshake has been read.
+ */
+static int process_accept(struct ceph_connection *con)
+{
+ struct ceph_connection *existing;
+ struct ceph_messenger *msgr = con->msgr;
+ u32 peer_gseq = le32_to_cpu(con->in_connect.global_seq);
+ u32 peer_cseq = le32_to_cpu(con->in_connect.connect_seq);
+ bool retry = true;
+ bool replace = false;
+
+ dout(10, "process_accept %p got gseq %d cseq %d\n", con,
+ peer_gseq, peer_cseq);
+
+ if (verify_hello(con) < 0)
+ return -1;
+
+ /* note flags */
+ if (con->in_connect.flags & CEPH_MSG_CONNECT_LOSSY)
+ set_bit(LOSSYRX, &con->state);
+
+ /* do we have an existing connection for this peer? */
+ if (radix_tree_preload(GFP_NOFS) < 0) {
+ derr(10, "ENOMEM in process_accept\n");
+ con->error_msg = "out of memory";
+ return -1;
+ }
+
+ memset(&con->out_reply, 0, sizeof(con->out_reply));
+
+ spin_lock(&msgr->con_lock);
+ existing = __get_connection(msgr, &con->peer_addr);
+ if (existing) {
+ if (peer_gseq < existing->peer_global_seq) {
+ /* out of order connection attempt */
+ con->out_reply.tag = CEPH_MSGR_TAG_RETRY_GLOBAL;
+ con->out_reply.global_seq =
+ cpu_to_le32(con->peer_global_seq);
+ goto reply;
+ }
+ if (test_bit(LOSSYTX, &existing->state)) {
+ dout(20, "process_accept %p replacing LOSSYTX %p\n",
+ con, existing);
+ replace = true;
+ goto accept;
+ }
+ if (peer_cseq < existing->connect_seq) {
+ if (peer_cseq == 0) {
+ /* peer reset, then connected to us */
+ reset_connection(existing);
+ con->msgr->peer_reset(con->msgr->parent,
+ &con->peer_addr,
+ &con->peer_name);
+ replace = true;
+ goto accept;
+ }
+
+ /* old attempt or peer didn't get the READY */
+ con->out_reply.tag = CEPH_MSGR_TAG_RETRY_SESSION;
+ con->out_reply.connect_seq =
+ cpu_to_le32(existing->connect_seq);
+ goto reply;
+ }
+
+ if (peer_cseq == existing->connect_seq) {
+ /* connection race */
+ dout(20, "process_accept connection race state = %lu\n",
+ con->state);
+ if (ceph_entity_addr_equal(&msgr->inst.addr,
+ &con->peer_addr)) {
+ /* incoming connection wins.. */
+ replace = true;
+ goto accept;
+ }
+
+ /* our existing outgoing connection wins, tell peer
+ to wait for our outging connection to go through */
+ con->out_reply.tag = CEPH_MSGR_TAG_WAIT;
+ goto reply;
+ }
+
+ if (existing->connect_seq == 0 &&
+ peer_cseq > existing->connect_seq) {
+ /* we reset and already reconnecting */
+ con->out_reply.tag = CEPH_MSGR_TAG_RESETSESSION;
+ goto reply;
+ }
+
+ WARN_ON(le32_to_cpu(con->in_connect.connect_seq) <=
+ existing->connect_seq);
+ WARN_ON(le32_to_cpu(con->in_connect.global_seq) <
+ existing->peer_global_seq);
+ if (existing->connect_seq == 0) {
+ /* we reset, sending RESETSESSION */
+ con->out_reply.tag = CEPH_MSGR_TAG_RESETSESSION;
+ goto reply;
+ }
+
+ /* reconnect, replace connection */
+ replace = true;
+ goto accept;
+ }
+
+ if (peer_cseq == 0) {
+ dout(20, "process_accept no existing connection, opening\n");
+ goto accept;
+ } else {
+ dout(20, "process_accept no existing connection, we reset\n");
+ con->out_reply.tag = CEPH_MSGR_TAG_RESETSESSION;
+ goto reply;
+ }
+
+
+accept:
+ /* accept this connection */
+ con->connect_seq = peer_cseq + 1;
+ con->peer_global_seq = peer_gseq;
+ dout(10, "process_accept %p cseq %d peer_gseq %d %s\n", con,
+ con->connect_seq, peer_gseq, replace ? "replace" : "new");
+
+ con->out_reply.tag = CEPH_MSGR_TAG_READY;
+ con->out_reply.global_seq = cpu_to_le32(get_global_seq(con->msgr, 0));
+ con->out_reply.connect_seq = cpu_to_le32(peer_cseq + 1);
+
+ retry = false;
+ prepare_read_tag(con);
+
+ /* do this _after_ con is ready to go */
+ if (replace)
+ __replace_connection(msgr, existing, con);
+ else
+ __register_connection(msgr, con);
+ put_connection(con);
+
+reply:
+ if (existing)
+ put_connection(existing);
+ prepare_write_accept_reply(con, retry);
+
+ spin_unlock(&msgr->con_lock);
+ radix_tree_preload_end();
+
+ ceph_queue_con(con);
+ 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;
+ u32 ack = le32_to_cpu(con->in_temp_ack);
+ u64 seq;
+
+ spin_lock(&con->out_queue_lock);
+ 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(5, "got ack for seq %llu type %d at %p\n", seq,
+ le16_to_cpu(m->hdr.type), m);
+ ceph_msg_remove(m);
+ }
+ spin_unlock(&con->out_queue_lock);
+ prepare_read_tag(con);
+}
+
+
+
+
+
+
+/*
+ * read (part of) a message.
+ */
+static int read_partial_message(struct ceph_connection *con)
+{
+ struct ceph_msg *m = con->in_msg;
+ void *p;
+ int ret;
+ int to, want, left;
+ unsigned front_len, data_len, data_off;
+ struct ceph_client *client = con->msgr->parent;
+ int datacrc = !ceph_test_opt(client, NOCRC);
+
+ dout(20, "read_partial_message con %p msg %p\n", con, m);
+
+ /* header */
+ while (con->in_base_pos < sizeof(m->hdr)) {
+ left = sizeof(m->hdr) - con->in_base_pos;
+ ret = ceph_tcp_recvmsg(con->sock,
+ (char *)&m->hdr + con->in_base_pos,
+ left);
+ if (ret <= 0)
+ return ret;
+ con->in_base_pos += ret;
+ if (con->in_base_pos == sizeof(m->hdr)) {
+ u32 crc = crc32c(0, (void *)&m->hdr,
+ sizeof(m->hdr) - sizeof(m->hdr.crc));
+ if (crc != le32_to_cpu(m->hdr.crc)) {
+ print_section("hdr", (u8 *)&m->hdr,
+ sizeof(m->hdr));
+ derr(0, "read_partial_message %p bad hdr crc"
+ " %u != expected %u\n",
+ m, crc, m->hdr.crc);
+ return -EBADMSG;
+ }
+ }
+ }
+
+ /* front */
+ front_len = le32_to_cpu(m->hdr.front_len);
+ if (front_len > CEPH_MSG_MAX_FRONT_LEN)
+ return -EIO;
+
+ while (m->front.iov_len < front_len) {
+ if (m->front.iov_base == NULL) {
+ m->front.iov_base = kmalloc(front_len, GFP_NOFS);
+ if (m->front.iov_base == NULL)
+ return -ENOMEM;
+ }
+ left = front_len - m->front.iov_len;
+ ret = ceph_tcp_recvmsg(con->sock, (char *)m->front.iov_base +
+ m->front.iov_len, left);
+ if (ret <= 0)
+ return ret;
+ m->front.iov_len += ret;
+ if (m->front.iov_len == front_len)
+ con->in_front_crc = crc32c(0, m->front.iov_base,
+ m->front.iov_len);
+ }
+
+ /* (page) data */
+ data_len = le32_to_cpu(m->hdr.data_len);
+ if (data_len > CEPH_MSG_MAX_DATA_LEN)
+ return -EIO;
+
+ data_off = le16_to_cpu(m->hdr.data_off);
+ if (data_len == 0)
+ goto no_data;
+
+ if (m->nr_pages == 0) {
+ con->in_msg_pos.page = 0;
+ con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
+ con->in_msg_pos.data_pos = 0;
+ /* find pages for data payload */
+ want = calc_pages_for(data_off & ~PAGE_MASK, data_len);
+ ret = 0;
+ BUG_ON(!con->msgr->prepare_pages);
+ ret = con->msgr->prepare_pages(con->msgr->parent, m, want);
+ if (ret < 0) {
+ dout(10, "prepare_pages failed, skipping payload\n");
+ con->in_base_pos = -data_len - sizeof(m->footer);
+ ceph_msg_put(con->in_msg);
+ con->in_msg = NULL;
+ con->in_tag = CEPH_MSGR_TAG_READY;
+ return 0;
+ }
+ BUG_ON(m->nr_pages < want);
+ }
+ while (con->in_msg_pos.data_pos < data_len) {
+ left = min((int)(data_len - con->in_msg_pos.data_pos),
+ (int)(PAGE_SIZE - con->in_msg_pos.page_pos));
+ mutex_lock(&m->page_mutex);
+ if (!m->pages) {
+ dout(10, "pages revoked during msg read\n");
+ mutex_unlock(&m->page_mutex);
+ con->in_base_pos = con->in_msg_pos.data_pos - data_len -
+ sizeof(m->footer);
+ ceph_msg_put(m);
+ con->in_msg = NULL;
+ con->in_tag = CEPH_MSGR_TAG_READY;
+ return 0;
+ }
+ p = kmap(m->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(m->pages[con->in_msg_pos.page]);
+ mutex_unlock(&m->page_mutex);
+ 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++;
+ }
+ }
+
+no_data:
+ /* 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(20, "read_partial_message got msg %p\n", m);
+
+ /* crc ok? */
+ if (con->in_front_crc != le32_to_cpu(m->footer.front_crc)) {
+ derr(0, "read_partial_message %p front crc %u != expected %u\n",
+ con->in_msg,
+ con->in_front_crc, m->footer.front_crc);
+ print_section("front", (u8 *)&m->front.iov_base,
+ sizeof(m->front.iov_len));
+ return -EBADMSG;
+ }
+ if (datacrc &&
+ (le32_to_cpu(m->footer.flags) & CEPH_MSG_FOOTER_NOCRC) == 0 &&
+ con->in_data_crc != le32_to_cpu(m->footer.data_crc)) {
+ int cur_page, data_pos;
+ derr(0, "read_partial_message %p data crc %u != expected %u\n",
+ con->in_msg,
+ con->in_data_crc, m->footer.data_crc);
+ for (data_pos = 0, cur_page = 0; data_pos < data_len;
+ data_pos += PAGE_SIZE, cur_page++) {
+ left = min((int)(data_len - data_pos),
+ (int)(PAGE_SIZE));
+ mutex_lock(&m->page_mutex);
+
+ if (!m->pages) {
+ derr(0, "m->pages == NULL\n");
+ mutex_unlock(&m->page_mutex);
+ break;
+ }
+
+ p = kmap(m->pages[cur_page]);
+ print_section("data", p, left);
+
+ kunmap(m->pages[0]);
+ mutex_unlock(&m->page_mutex);
+ }
+ return -EBADMSG;
+ }
+
+ /* did i learn my ip? */
+ if (con->msgr->inst.addr.ipaddr.sin_addr.s_addr == htonl(INADDR_ANY)) {
+ /*
+ * in practice, we learn our ip from the first incoming mon
+ * message, before anyone else knows we exist, so this is
+ * safe.
+ */
+ con->msgr->inst.addr.ipaddr = con->in_msg->hdr.dst.addr.ipaddr;
+ dout(10, "read_partial_message learned my addr is "
+ "%u.%u.%u.%u:%u\n",
+ IPQUADPORT(con->msgr->inst.addr.ipaddr));
+ }
+
+ 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)
+{
+ /* if first message, set peer_name */
+ if (con->peer_name.type == 0)
+ con->peer_name = con->in_msg->hdr.src.name;
+
+ spin_lock(&con->out_queue_lock);
+ con->in_seq++;
+ spin_unlock(&con->out_queue_lock);
+
+ dout(1, "===== %p %llu from %s%d %d=%s len %d+%d (%u %u) =====\n",
+ con->in_msg, le64_to_cpu(con->in_msg->hdr.seq),
+ ENTITY_NAME(con->in_msg->hdr.src.name),
+ le16_to_cpu(con->in_msg->hdr.type),
+ ceph_msg_type_name(le16_to_cpu(con->in_msg->hdr.type)),
+ le32_to_cpu(con->in_msg->hdr.front_len),
+ le32_to_cpu(con->in_msg->hdr.data_len),
+ con->in_front_crc, con->in_data_crc);
+ con->msgr->dispatch(con->msgr->parent, con->in_msg);
+ con->in_msg = NULL;
+ 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(30, "try_write start %p state %lu nref %d\n", con, con->state,
+ atomic_read(&con->nref));
+
+more:
+ dout(30, "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_connect(msgr, con);
+ prepare_read_connect(con);
+ set_bit(CONNECTING, &con->state);
+
+ con->in_tag = CEPH_MSGR_TAG_READY;
+ dout(5, "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_kvec_left) {
+ ret = write_partial_kvec(con);
+ if (ret <= 0)
+ goto done;
+ if (ret < 0) {
+ dout(30, "try_write write_partial_kvec err %d\n", ret);
+ goto done;
+ }
+ }
+
+ /* msg pages? */
+ if (con->out_msg) {
+ 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(30, "try_write write_partial_msg_pages err %d\n",
+ ret);
+ goto done;
+ }
+ }
+
+ if (!test_bit(CONNECTING, &con->state)) {
+ /* is anything else pending? */
+ spin_lock(&con->out_queue_lock);
+ if (!list_empty(&con->out_queue)) {
+ prepare_write_message(con);
+ spin_unlock(&con->out_queue_lock);
+ goto more;
+ }
+ if (con->in_seq > con->in_seq_acked) {
+ prepare_write_ack(con);
+ spin_unlock(&con->out_queue_lock);
+ goto more;
+ }
+ spin_unlock(&con->out_queue_lock);
+ }
+
+ /* Nothing to do! */
+ clear_bit(WRITE_PENDING, &con->state);
+ dout(30, "try_write nothing else to write.\n");
+done:
+ ret = 0;
+out:
+ dout(30, "try_write done on %p\n", con);
+ return ret;
+}
+
+
+
+/*
+ * Read what we can from the socket.
+ */
+static int try_read(struct ceph_connection *con)
+{
+ struct ceph_messenger *msgr;
+ int ret = -1;
+
+ if (!con->sock)
+ return 0;
+
+ if (test_bit(STANDBY, &con->state))
+ return 0;
+
+ dout(20, "try_read start on %p\n", con);
+ msgr = con->msgr;
+
+more:
+ dout(20, "try_read tag %d in_base_pos %d\n", (int)con->in_tag,
+ con->in_base_pos);
+ if (test_bit(ACCEPTING, &con->state)) {
+ dout(20, "try_read accepting\n");
+ ret = read_partial_accept(con);
+ if (ret <= 0)
+ goto done;
+ if (process_accept(con) < 0) {
+ ret = -1;
+ goto out;
+ }
+ goto more;
+ }
+ if (test_bit(CONNECTING, &con->state)) {
+ dout(20, "try_read connecting\n");
+ 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(20, "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(30, "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(20, "try_read done on %p\n", con);
+ return ret;
+
+bad_tag:
+ derr(2, "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 ceph_queue_con(struct ceph_connection *con)
+{
+ if (test_bit(WAIT, &con->state) ||
+ test_bit(CLOSED, &con->state)) {
+ dout(40, "ceph_queue_con %p ignoring: WAIT|CLOSED\n",
+ con);
+ return;
+ }
+
+ atomic_inc(&con->nref);
+ dout(40, "ceph_queue_con %p %d -> %d\n", con,
+ atomic_read(&con->nref) - 1, atomic_read(&con->nref));
+
+ set_bit(QUEUED, &con->state);
+ if (test_bit(BUSY, &con->state) ||
+ !queue_work(ceph_msgr_wq, &con->work.work)) {
+ dout(40, "ceph_queue_con %p - already BUSY or queued\n", con);
+ put_connection(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(10, "con_work %p BUSY already set\n", con);
+ goto out;
+ }
+ dout(10, "con_work %p start, clearing QUEUED\n", con);
+ clear_bit(QUEUED, &con->state);
+
+ if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
+ dout(5, "con_work CLOSED\n");
+ goto done;
+ }
+ if (test_bit(WAIT, &con->state)) { /* we are a zombie */
+ dout(5, "con_work WAIT\n");
+ goto done;
+ }
+
+ if (test_and_clear_bit(SOCK_CLOSED, &con->state) ||
+ try_read(con) < 0 ||
+ try_write(con) < 0) {
+ backoff = 1;
+ ceph_fault(con); /* error/fault path */
+ }
+
+done:
+ clear_bit(BUSY, &con->state);
+ dout(10, "con->state=%lu\n", con->state);
+ if (test_bit(QUEUED, &con->state)) {
+ if (!backoff) {
+ dout(10, "con_work %p QUEUED reset, looping\n", con);
+ goto more;
+ }
+ dout(10, "con_work %p QUEUED reset, but just faulted\n", con);
+ clear_bit(QUEUED, &con->state);
+ }
+ dout(10, "con_work %p done\n", con);
+
+out:
+ put_connection(con);
+}
+
+
+/*
+ * Generic error/fault handler. A retry mechanism is used with
+ * exponential backoff
+ */
+static void ceph_fault(struct ceph_connection *con)
+{
+ derr(1, "%s%d %u.%u.%u.%u:%u %s\n", ENTITY_NAME(con->peer_name),
+ IPQUADPORT(con->peer_addr.ipaddr), con->error_msg);
+ dout(10, "fault %p state %lu to peer %u.%u.%u.%u:%u\n",
+ con, con->state, IPQUADPORT(con->peer_addr.ipaddr));
+
+ if (test_bit(LOSSYTX, &con->state)) {
+ dout(30, "fault on LOSSYTX channel\n");
+ remove_connection(con->msgr, con);
+ return;
+ }
+
+ clear_bit(BUSY, &con->state); /* to avoid an improbable race */
+
+ con_close_socket(con);
+ con->in_msg = NULL;
+
+ /* If there are no messages in the queue, place the connection
+ * in a STANDBY state (i.e., don't try to reconnect just yet). */
+ spin_lock(&con->out_queue_lock);
+ if (list_empty(&con->out_queue)) {
+ dout(10, "fault setting STANDBY\n");
+ set_bit(STANDBY, &con->state);
+ spin_unlock(&con->out_queue_lock);
+ return;
+ }
+
+ /* Requeue anything that hasn't been acked, and retry after a
+ * delay. */
+ list_splice_init(&con->out_sent, &con->out_queue);
+ spin_unlock(&con->out_queue_lock);
+
+ if (con->delay == 0)
+ con->delay = BASE_DELAY_INTERVAL;
+ else if (con->delay < MAX_DELAY_INTERVAL)
+ con->delay *= 2;
+
+ /* explicitly schedule work to try to reconnect again later. */
+ dout(40, "fault queueing %p %d -> %d delay %lu\n", con,
+ atomic_read(&con->nref), atomic_read(&con->nref) + 1,
+ con->delay);
+ atomic_inc(&con->nref);
+ queue_delayed_work(ceph_msgr_wq, &con->work,
+ round_jiffies_relative(con->delay));
+}
+
+
+/*
+ * Handle an incoming connection.
+ */
+static void accept_work(struct work_struct *work)
+{
+ struct ceph_connection *newcon = NULL;
+ struct ceph_messenger *msgr = container_of(work, struct ceph_messenger,
+ awork);
+
+ /* initialize the msgr connection */
+ newcon = new_connection(msgr);
+ if (newcon == NULL) {
+ derr(1, "kmalloc failure accepting new connection\n");
+ return;
+ }
+
+ set_bit(ACCEPTING, &newcon->state);
+ newcon->connect_seq = 1;
+ newcon->in_tag = CEPH_MSGR_TAG_READY; /* eventually, hopefully */
+
+ if (ceph_tcp_accept(msgr->listen_sock, newcon) < 0) {
+ derr(1, "error accepting connection\n");
+ put_connection(newcon);
+ return;
+ }
+ dout(5, "accepted connection \n");
+
+ prepare_write_accept_hello(msgr, newcon);
+ add_connection_accepting(msgr, newcon);
+
+ /* queue work explicitly; we may have missed the socket state
+ * change before setting the socket callbacks. */
+ ceph_queue_con(newcon);
+}
+
+
+
+/*
+ * create a new messenger instance, creates listening socket
+ */
+struct ceph_messenger *ceph_messenger_create(struct ceph_entity_addr *myaddr)
+{
+ struct ceph_messenger *msgr;
+ int ret = 0;
+
+ msgr = kzalloc(sizeof(*msgr), GFP_KERNEL);
+ if (msgr == NULL)
+ return ERR_PTR(-ENOMEM);
+
+ INIT_WORK(&msgr->awork, accept_work);
+ spin_lock_init(&msgr->con_lock);
+ INIT_LIST_HEAD(&msgr->con_all);
+ INIT_LIST_HEAD(&msgr->con_accepting);
+ INIT_RADIX_TREE(&msgr->con_tree, GFP_ATOMIC);
+ 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 = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ if (!msgr->zero_page) {
+ kfree(msgr);
+ return ERR_PTR(-ENOMEM);
+ }
+ kmap(msgr->zero_page);
+
+ /* pick listening address */
+ if (myaddr) {
+ msgr->inst.addr = *myaddr;
+ } else {
+ dout(10, "create my ip not specified, binding to INADDR_ANY\n");
+ msgr->inst.addr.ipaddr.sin_addr.s_addr = htonl(INADDR_ANY);
+ msgr->inst.addr.ipaddr.sin_port = htons(0); /* any port */
+ }
+ msgr->inst.addr.ipaddr.sin_family = AF_INET;
+
+ /* create listening socket */
+ ret = ceph_tcp_listen(msgr);
+ if (ret < 0) {
+ kfree(msgr);
+ return ERR_PTR(ret);
+ }
+ if (myaddr)
+ msgr->inst.addr.ipaddr.sin_addr = myaddr->ipaddr.sin_addr;
+
+ dout(1, "messenger %p listening on %u.%u.%u.%u:%u\n", msgr,
+ IPQUADPORT(msgr->inst.addr.ipaddr));
+ return msgr;
+}
+
+void ceph_messenger_destroy(struct ceph_messenger *msgr)
+{
+ struct ceph_connection *con;
+
+ dout(2, "destroy %p\n", msgr);
+
+ /* stop listener */
+ msgr->listen_sock->ops->shutdown(msgr->listen_sock, SHUT_RDWR);
+ sock_release(msgr->listen_sock);
+ cancel_work_sync(&msgr->awork);
+
+ /* kill off connections */
+ spin_lock(&msgr->con_lock);
+ while (!list_empty(&msgr->con_all)) {
+ con = list_first_entry(&msgr->con_all, struct ceph_connection,
+ list_all);
+ dout(10, "destroy removing connection %p\n", con);
+ set_bit(CLOSED, &con->state);
+ atomic_inc(&con->nref);
+ dout(40, " get %p %d -> %d\n", con,
+ atomic_read(&con->nref) - 1, atomic_read(&con->nref));
+ __remove_connection(msgr, con);
+
+ /* in case there's queued work. drop a reference if
+ * we successfully cancel work. */
+ spin_unlock(&msgr->con_lock);
+ if (cancel_delayed_work_sync(&con->work))
+ put_connection(con);
+ put_connection(con);
+ dout(10, "destroy removed connection %p\n", con);
+
+ spin_lock(&msgr->con_lock);
+ }
+ spin_unlock(&msgr->con_lock);
+
+ kunmap(msgr->zero_page);
+ __free_page(msgr->zero_page);
+
+ kfree(msgr);
+ dout(10, "destroyed messenger %p\n", msgr);
+}
+
+/*
+ * mark a peer down. drop any open connections.
+ */
+void ceph_messenger_mark_down(struct ceph_messenger *msgr,
+ struct ceph_entity_addr *addr)
+{
+ struct ceph_connection *con;
+
+ dout(2, "mark_down peer %u.%u.%u.%u:%u\n",
+ IPQUADPORT(addr->ipaddr));
+
+ spin_lock(&msgr->con_lock);
+ con = __get_connection(msgr, addr);
+ if (con) {
+ dout(1, "mark_down %s%d %u.%u.%u.%u:%u (%p)\n",
+ ENTITY_NAME(con->peer_name),
+ IPQUADPORT(con->peer_addr.ipaddr), con);
+ set_bit(CLOSED, &con->state); /* in case there's queued work */
+ __remove_connection(msgr, con);
+ }
+ spin_unlock(&msgr->con_lock);
+ if (con)
+ put_connection(con);
+}
+
+
+/*
+ * A single ceph_msg can't be queued for send twice, unless it's
+ * already been delivered (i.e. we have the only remaining reference),
+ * because of the list_head indicating which queue it is on.
+ *
+ * So, we dup the message if there is more than once reference. If it has
+ * pages (a data payload), steal the pages away from the old message.
+ */
+struct ceph_msg *ceph_msg_maybe_dup(struct ceph_msg *old)
+{
+ struct ceph_msg *dup;
+
+ if (atomic_read(&old->nref) == 1)
+ return old; /* we have only ref, all is well */
+
+ dup = ceph_msg_new(le16_to_cpu(old->hdr.type),
+ le32_to_cpu(old->hdr.front_len),
+ le32_to_cpu(old->hdr.data_len),
+ le16_to_cpu(old->hdr.data_off),
+ old->pages);
+ if (!dup)
+ return ERR_PTR(-ENOMEM);
+ memcpy(dup->front.iov_base, old->front.iov_base,
+ le32_to_cpu(old->hdr.front_len));
+
+ /* revoke old message's pages */
+ mutex_lock(&old->page_mutex);
+ old->pages = NULL;
+ old->footer.flags |= cpu_to_le32(CEPH_MSG_FOOTER_ABORTED);
+ mutex_unlock(&old->page_mutex);
+
+ ceph_msg_put(old);
+ return dup;
+}
+
+
+/*
+ * Queue up an outgoing message.
+ *
+ * This consumes a msg reference. That is, if the caller wants to
+ * keep @msg around, it had better call ceph_msg_get first.
+ */
+int ceph_msg_send(struct ceph_messenger *msgr, struct ceph_msg *msg,
+ unsigned long timeout)
+{
+ struct ceph_connection *con, *newcon;
+ int ret = 0;
+
+ /* set source */
+ msg->hdr.src = msgr->inst;
+ msg->hdr.orig_src = msgr->inst;
+
+ /* do we have the connection? */
+ spin_lock(&msgr->con_lock);
+ con = __get_connection(msgr, &msg->hdr.dst.addr);
+ if (!con) {
+ /* drop lock while we allocate a new connection */
+ spin_unlock(&msgr->con_lock);
+
+ newcon = new_connection(msgr);
+ if (IS_ERR(newcon))
+ return PTR_ERR(con);
+
+ newcon->out_connect.flags = 0;
+ if (!timeout) {
+ dout(10, "ceph_msg_send setting LOSSYTX\n");
+ newcon->out_connect.flags |= CEPH_MSG_CONNECT_LOSSY;
+ set_bit(LOSSYTX, &newcon->state);
+ }
+
+ ret = radix_tree_preload(GFP_NOFS);
+ if (ret < 0) {
+ derr(10, "ENOMEM in ceph_msg_send\n");
+ return ret;
+ }
+
+ spin_lock(&msgr->con_lock);
+ con = __get_connection(msgr, &msg->hdr.dst.addr);
+ if (con) {
+ put_connection(newcon);
+ dout(10, "ceph_msg_send (lost race and) had connection "
+ "%p to peer %u.%u.%u.%u:%u\n", con,
+ IPQUADPORT(msg->hdr.dst.addr.ipaddr));
+ } else {
+ con = newcon;
+ con->peer_addr = msg->hdr.dst.addr;
+ con->peer_name = msg->hdr.dst.name;
+ __register_connection(msgr, con);
+ dout(5, "ceph_msg_send new connection %p to peer "
+ "%u.%u.%u.%u:%u\n", con,
+ IPQUADPORT(msg->hdr.dst.addr.ipaddr));
+ }
+ spin_unlock(&msgr->con_lock);
+ radix_tree_preload_end();
+ } else {
+ dout(10, "ceph_msg_send had connection %p to peer "
+ "%u.%u.%u.%u:%u con->sock=%p\n", con,
+ IPQUADPORT(msg->hdr.dst.addr.ipaddr), con->sock);
+ spin_unlock(&msgr->con_lock);
+ }
+
+ /* queue */
+ spin_lock(&con->out_queue_lock);
+
+ /* avoid queuing multiple PING messages in a row. */
+ if (unlikely(le16_to_cpu(msg->hdr.type) == CEPH_MSG_PING &&
+ !list_empty(&con->out_queue) &&
+ le16_to_cpu(list_entry(con->out_queue.prev,
+ struct ceph_msg,
+ list_head)->hdr.type) == CEPH_MSG_PING)) {
+ dout(2, "ceph_msg_send dropping dup ping\n");
+ ceph_msg_put(msg);
+ } else {
+ msg->hdr.seq = cpu_to_le64(++con->out_seq);
+ dout(1, "----- %p %u to %s%d %d=%s len %d+%d -----\n", msg,
+ (unsigned)con->out_seq,
+ ENTITY_NAME(msg->hdr.dst.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.data_len));
+ dout(2, "ceph_msg_send %p seq %llu for %s%d on %p pgs %d\n",
+ msg, le64_to_cpu(msg->hdr.seq),
+ ENTITY_NAME(msg->hdr.dst.name), con, msg->nr_pages);
+ list_add_tail(&msg->list_head, &con->out_queue);
+ }
+ spin_unlock(&con->out_queue_lock);
+
+ /* if there wasn't anything waiting to send before, queue
+ * new work */
+ if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
+ ceph_queue_con(con);
+
+ put_connection(con);
+ dout(30, "ceph_msg_send done\n");
+ return ret;
+}
+
+
+/*
+ * 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,
+ int page_len, int page_off, struct page **pages)
+{
+ struct ceph_msg *m;
+
+ m = kmalloc(sizeof(*m), GFP_NOFS);
+ if (m == NULL)
+ goto out;
+ atomic_set(&m->nref, 1);
+ mutex_init(&m->page_mutex);
+ INIT_LIST_HEAD(&m->list_head);
+
+ m->hdr.type = cpu_to_le16(type);
+ m->hdr.front_len = cpu_to_le32(front_len);
+ m->hdr.data_len = cpu_to_le32(page_len);
+ m->hdr.data_off = cpu_to_le16(page_off);
+ m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
+ m->hdr.mon_protocol = CEPH_MON_PROTOCOL;
+ m->hdr.monc_protocol = CEPH_MONC_PROTOCOL;
+ m->hdr.osd_protocol = CEPH_OSD_PROTOCOL;
+ m->hdr.osdc_protocol = CEPH_OSDC_PROTOCOL;
+ m->hdr.mds_protocol = CEPH_MDS_PROTOCOL;
+ m->hdr.mdsc_protocol = CEPH_MDSC_PROTOCOL;
+ m->footer.front_crc = 0;
+ m->footer.data_crc = 0;
+ m->front_is_vmalloc = false;
+ m->more_to_follow = false;
+
+ /* front */
+ if (front_len) {
+ if (front_len > PAGE_CACHE_SIZE) {
+ m->front.iov_base = vmalloc(front_len);
+ m->front_is_vmalloc = true;
+ } else {
+ m->front.iov_base = kmalloc(front_len, GFP_NOFS);
+ }
+ if (m->front.iov_base == NULL) {
+ derr(0, "ceph_msg_new can't allocate %d bytes\n",
+ front_len);
+ goto out2;
+ }
+ } else {
+ m->front.iov_base = NULL;
+ }
+ m->front.iov_len = front_len;
+
+ /* pages */
+ m->nr_pages = calc_pages_for(page_off, page_len);
+ m->pages = pages;
+
+ dout(20, "ceph_msg_new %p page %d~%d -> %d\n", m, page_off, page_len,
+ m->nr_pages);
+ return m;
+
+out2:
+ ceph_msg_put(m);
+out:
+ derr(0, "msg_new can't create msg type %d len %d\n", type, front_len);
+ return ERR_PTR(-ENOMEM);
+}
+
+void ceph_msg_put(struct ceph_msg *m)
+{
+ dout(20, "ceph_msg_put %p %d -> %d\n", m, atomic_read(&m->nref),
+ atomic_read(&m->nref)-1);
+ if (atomic_read(&m->nref) <= 0) {
+ derr(0, "bad ceph_msg_put on %p %llu %s%d->%s%d %d=%s %d+%d\n",
+ m, le64_to_cpu(m->hdr.seq),
+ ENTITY_NAME(m->hdr.src.name),
+ ENTITY_NAME(m->hdr.dst.name),
+ le16_to_cpu(m->hdr.type),
+ ceph_msg_type_name(le16_to_cpu(m->hdr.type)),
+ le32_to_cpu(m->hdr.front_len),
+ le32_to_cpu(m->hdr.data_len));
+ WARN_ON(1);
+ }
+ if (atomic_dec_and_test(&m->nref)) {
+ dout(20, "ceph_msg_put last one on %p\n", m);
+ WARN_ON(!list_empty(&m->list_head));
+ if (m->front_is_vmalloc)
+ vfree(m->front.iov_base);
+ else
+ kfree(m->front.iov_base);
+ kfree(m);
+ }
+}
+
+void ceph_ping(struct ceph_messenger *msgr, struct ceph_entity_name name,
+ struct ceph_entity_addr *addr)
+{
+ struct ceph_msg *m;
+
+ m = ceph_msg_new(CEPH_MSG_PING, 0, 0, 0, NULL);
+ if (!m)
+ return;
+ memset(m->front.iov_base, 0, m->front.iov_len);
+ m->hdr.dst.name = name;
+ m->hdr.dst.addr = *addr;
+ ceph_msg_send(msgr, m, BASE_DELAY_INTERVAL);
+}
projects / ceph-client.git / commitdiff