mirror of https://gitee.com/openkylin/linux.git
2250 lines
56 KiB
C
2250 lines
56 KiB
C
#include "ceph_debug.h"
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#include <linux/crc32c.h>
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#include <linux/ctype.h>
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#include <linux/highmem.h>
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#include <linux/inet.h>
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#include <linux/kthread.h>
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#include <linux/net.h>
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#include <linux/slab.h>
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#include <linux/socket.h>
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#include <linux/string.h>
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#include <net/tcp.h>
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#include "super.h"
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#include "messenger.h"
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#include "decode.h"
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#include "pagelist.h"
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/*
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* Ceph uses the messenger to exchange ceph_msg messages with other
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* hosts in the system. The messenger provides ordered and reliable
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* delivery. We tolerate TCP disconnects by reconnecting (with
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* exponential backoff) in the case of a fault (disconnection, bad
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* crc, protocol error). Acks allow sent messages to be discarded by
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* the sender.
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*/
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/* static tag bytes (protocol control messages) */
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static char tag_msg = CEPH_MSGR_TAG_MSG;
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static char tag_ack = CEPH_MSGR_TAG_ACK;
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static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE;
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#ifdef CONFIG_LOCKDEP
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static struct lock_class_key socket_class;
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#endif
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static void queue_con(struct ceph_connection *con);
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static void con_work(struct work_struct *);
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static void ceph_fault(struct ceph_connection *con);
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const char *ceph_name_type_str(int t)
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{
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switch (t) {
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case CEPH_ENTITY_TYPE_MON: return "mon";
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case CEPH_ENTITY_TYPE_MDS: return "mds";
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case CEPH_ENTITY_TYPE_OSD: return "osd";
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case CEPH_ENTITY_TYPE_CLIENT: return "client";
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case CEPH_ENTITY_TYPE_ADMIN: return "admin";
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default: return "???";
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}
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}
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/*
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* nicely render a sockaddr as a string.
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*/
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#define MAX_ADDR_STR 20
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static char addr_str[MAX_ADDR_STR][40];
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static DEFINE_SPINLOCK(addr_str_lock);
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static int last_addr_str;
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const char *pr_addr(const struct sockaddr_storage *ss)
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{
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int i;
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char *s;
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struct sockaddr_in *in4 = (void *)ss;
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unsigned char *quad = (void *)&in4->sin_addr.s_addr;
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struct sockaddr_in6 *in6 = (void *)ss;
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spin_lock(&addr_str_lock);
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i = last_addr_str++;
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if (last_addr_str == MAX_ADDR_STR)
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last_addr_str = 0;
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spin_unlock(&addr_str_lock);
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s = addr_str[i];
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switch (ss->ss_family) {
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case AF_INET:
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sprintf(s, "%u.%u.%u.%u:%u",
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(unsigned int)quad[0],
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(unsigned int)quad[1],
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(unsigned int)quad[2],
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(unsigned int)quad[3],
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(unsigned int)ntohs(in4->sin_port));
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break;
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case AF_INET6:
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sprintf(s, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%u",
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in6->sin6_addr.s6_addr16[0],
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in6->sin6_addr.s6_addr16[1],
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in6->sin6_addr.s6_addr16[2],
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in6->sin6_addr.s6_addr16[3],
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in6->sin6_addr.s6_addr16[4],
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in6->sin6_addr.s6_addr16[5],
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in6->sin6_addr.s6_addr16[6],
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in6->sin6_addr.s6_addr16[7],
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(unsigned int)ntohs(in6->sin6_port));
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break;
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default:
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sprintf(s, "(unknown sockaddr family %d)", (int)ss->ss_family);
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}
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return s;
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}
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static void encode_my_addr(struct ceph_messenger *msgr)
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{
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memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
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ceph_encode_addr(&msgr->my_enc_addr);
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}
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/*
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* work queue for all reading and writing to/from the socket.
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*/
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struct workqueue_struct *ceph_msgr_wq;
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int __init ceph_msgr_init(void)
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{
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ceph_msgr_wq = create_workqueue("ceph-msgr");
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if (IS_ERR(ceph_msgr_wq)) {
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int ret = PTR_ERR(ceph_msgr_wq);
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pr_err("msgr_init failed to create workqueue: %d\n", ret);
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ceph_msgr_wq = NULL;
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return ret;
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}
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return 0;
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}
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void ceph_msgr_exit(void)
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{
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destroy_workqueue(ceph_msgr_wq);
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}
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/*
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* socket callback functions
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*/
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/* data available on socket, or listen socket received a connect */
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static void ceph_data_ready(struct sock *sk, int count_unused)
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{
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struct ceph_connection *con =
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(struct ceph_connection *)sk->sk_user_data;
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if (sk->sk_state != TCP_CLOSE_WAIT) {
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dout("ceph_data_ready on %p state = %lu, queueing work\n",
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con, con->state);
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queue_con(con);
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}
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}
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/* socket has buffer space for writing */
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static void ceph_write_space(struct sock *sk)
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{
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struct ceph_connection *con =
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(struct ceph_connection *)sk->sk_user_data;
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/* only queue to workqueue if there is data we want to write. */
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if (test_bit(WRITE_PENDING, &con->state)) {
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dout("ceph_write_space %p queueing write work\n", con);
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queue_con(con);
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} else {
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dout("ceph_write_space %p nothing to write\n", con);
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}
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/* since we have our own write_space, clear the SOCK_NOSPACE flag */
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clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags);
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}
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/* socket's state has changed */
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static void ceph_state_change(struct sock *sk)
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{
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struct ceph_connection *con =
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(struct ceph_connection *)sk->sk_user_data;
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dout("ceph_state_change %p state = %lu sk_state = %u\n",
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con, con->state, sk->sk_state);
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if (test_bit(CLOSED, &con->state))
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return;
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switch (sk->sk_state) {
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case TCP_CLOSE:
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dout("ceph_state_change TCP_CLOSE\n");
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case TCP_CLOSE_WAIT:
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dout("ceph_state_change TCP_CLOSE_WAIT\n");
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if (test_and_set_bit(SOCK_CLOSED, &con->state) == 0) {
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if (test_bit(CONNECTING, &con->state))
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con->error_msg = "connection failed";
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else
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con->error_msg = "socket closed";
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queue_con(con);
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}
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break;
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case TCP_ESTABLISHED:
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dout("ceph_state_change TCP_ESTABLISHED\n");
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queue_con(con);
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break;
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}
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}
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/*
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* set up socket callbacks
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*/
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static void set_sock_callbacks(struct socket *sock,
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struct ceph_connection *con)
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{
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struct sock *sk = sock->sk;
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sk->sk_user_data = (void *)con;
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sk->sk_data_ready = ceph_data_ready;
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sk->sk_write_space = ceph_write_space;
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sk->sk_state_change = ceph_state_change;
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}
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/*
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* socket helpers
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*/
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/*
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* initiate connection to a remote socket.
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*/
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static struct socket *ceph_tcp_connect(struct ceph_connection *con)
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{
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struct sockaddr *paddr = (struct sockaddr *)&con->peer_addr.in_addr;
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struct socket *sock;
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int ret;
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BUG_ON(con->sock);
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ret = sock_create_kern(AF_INET, SOCK_STREAM, IPPROTO_TCP, &sock);
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if (ret)
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return ERR_PTR(ret);
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con->sock = sock;
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sock->sk->sk_allocation = GFP_NOFS;
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#ifdef CONFIG_LOCKDEP
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lockdep_set_class(&sock->sk->sk_lock, &socket_class);
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#endif
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set_sock_callbacks(sock, con);
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dout("connect %s\n", pr_addr(&con->peer_addr.in_addr));
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ret = sock->ops->connect(sock, paddr, sizeof(*paddr), O_NONBLOCK);
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if (ret == -EINPROGRESS) {
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dout("connect %s EINPROGRESS sk_state = %u\n",
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pr_addr(&con->peer_addr.in_addr),
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sock->sk->sk_state);
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ret = 0;
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}
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if (ret < 0) {
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pr_err("connect %s error %d\n",
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pr_addr(&con->peer_addr.in_addr), ret);
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sock_release(sock);
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con->sock = NULL;
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con->error_msg = "connect error";
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}
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if (ret < 0)
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return ERR_PTR(ret);
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return sock;
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}
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static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len)
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{
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struct kvec iov = {buf, len};
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struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
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return kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags);
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}
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/*
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* write something. @more is true if caller will be sending more data
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* shortly.
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*/
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static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov,
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size_t kvlen, size_t len, int more)
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{
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struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL };
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if (more)
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msg.msg_flags |= MSG_MORE;
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else
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msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */
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return kernel_sendmsg(sock, &msg, iov, kvlen, len);
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}
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/*
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* Shutdown/close the socket for the given connection.
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*/
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static int con_close_socket(struct ceph_connection *con)
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{
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int rc;
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dout("con_close_socket on %p sock %p\n", con, con->sock);
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if (!con->sock)
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return 0;
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set_bit(SOCK_CLOSED, &con->state);
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rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR);
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sock_release(con->sock);
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con->sock = NULL;
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clear_bit(SOCK_CLOSED, &con->state);
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return rc;
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}
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/*
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* Reset a connection. Discard all incoming and outgoing messages
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* and clear *_seq state.
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*/
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static void ceph_msg_remove(struct ceph_msg *msg)
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{
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list_del_init(&msg->list_head);
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ceph_msg_put(msg);
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}
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static void ceph_msg_remove_list(struct list_head *head)
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{
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while (!list_empty(head)) {
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struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
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list_head);
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ceph_msg_remove(msg);
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}
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}
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static void reset_connection(struct ceph_connection *con)
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{
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/* reset connection, out_queue, msg_ and connect_seq */
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/* discard existing out_queue and msg_seq */
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ceph_msg_remove_list(&con->out_queue);
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ceph_msg_remove_list(&con->out_sent);
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if (con->in_msg) {
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ceph_msg_put(con->in_msg);
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con->in_msg = NULL;
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}
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con->connect_seq = 0;
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con->out_seq = 0;
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if (con->out_msg) {
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ceph_msg_put(con->out_msg);
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con->out_msg = NULL;
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}
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con->in_seq = 0;
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con->in_seq_acked = 0;
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}
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/*
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* mark a peer down. drop any open connections.
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*/
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void ceph_con_close(struct ceph_connection *con)
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{
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dout("con_close %p peer %s\n", con, pr_addr(&con->peer_addr.in_addr));
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set_bit(CLOSED, &con->state); /* in case there's queued work */
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clear_bit(STANDBY, &con->state); /* avoid connect_seq bump */
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clear_bit(LOSSYTX, &con->state); /* so we retry next connect */
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clear_bit(KEEPALIVE_PENDING, &con->state);
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clear_bit(WRITE_PENDING, &con->state);
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mutex_lock(&con->mutex);
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reset_connection(con);
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cancel_delayed_work(&con->work);
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mutex_unlock(&con->mutex);
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queue_con(con);
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}
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/*
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* Reopen a closed connection, with a new peer address.
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*/
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void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr)
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{
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dout("con_open %p %s\n", con, pr_addr(&addr->in_addr));
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set_bit(OPENING, &con->state);
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clear_bit(CLOSED, &con->state);
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memcpy(&con->peer_addr, addr, sizeof(*addr));
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con->delay = 0; /* reset backoff memory */
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queue_con(con);
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}
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/*
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* return true if this connection ever successfully opened
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*/
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bool ceph_con_opened(struct ceph_connection *con)
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{
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return con->connect_seq > 0;
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}
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/*
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* generic get/put
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*/
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struct ceph_connection *ceph_con_get(struct ceph_connection *con)
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{
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dout("con_get %p nref = %d -> %d\n", con,
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atomic_read(&con->nref), atomic_read(&con->nref) + 1);
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if (atomic_inc_not_zero(&con->nref))
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return con;
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return NULL;
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}
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void ceph_con_put(struct ceph_connection *con)
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{
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dout("con_put %p nref = %d -> %d\n", con,
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atomic_read(&con->nref), atomic_read(&con->nref) - 1);
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BUG_ON(atomic_read(&con->nref) == 0);
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if (atomic_dec_and_test(&con->nref)) {
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BUG_ON(con->sock);
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kfree(con);
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}
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}
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/*
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* initialize a new connection.
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*/
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void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con)
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{
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dout("con_init %p\n", con);
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memset(con, 0, sizeof(*con));
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atomic_set(&con->nref, 1);
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con->msgr = msgr;
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mutex_init(&con->mutex);
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INIT_LIST_HEAD(&con->out_queue);
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INIT_LIST_HEAD(&con->out_sent);
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INIT_DELAYED_WORK(&con->work, con_work);
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}
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/*
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* We maintain a global counter to order connection attempts. Get
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* a unique seq greater than @gt.
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*/
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static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt)
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{
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u32 ret;
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spin_lock(&msgr->global_seq_lock);
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if (msgr->global_seq < gt)
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msgr->global_seq = gt;
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ret = ++msgr->global_seq;
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spin_unlock(&msgr->global_seq_lock);
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return ret;
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}
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/*
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* Prepare footer for currently outgoing message, and finish things
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* off. Assumes out_kvec* are already valid.. we just add on to the end.
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*/
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static void prepare_write_message_footer(struct ceph_connection *con, int v)
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{
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struct ceph_msg *m = con->out_msg;
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dout("prepare_write_message_footer %p\n", con);
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con->out_kvec_is_msg = true;
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con->out_kvec[v].iov_base = &m->footer;
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con->out_kvec[v].iov_len = sizeof(m->footer);
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con->out_kvec_bytes += sizeof(m->footer);
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con->out_kvec_left++;
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con->out_more = m->more_to_follow;
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con->out_msg_done = true;
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}
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/*
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* Prepare headers for the next outgoing message.
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*/
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static void prepare_write_message(struct ceph_connection *con)
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{
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struct ceph_msg *m;
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int v = 0;
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con->out_kvec_bytes = 0;
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con->out_kvec_is_msg = true;
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con->out_msg_done = false;
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/* Sneak an ack in there first? If we can get it into the same
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* TCP packet that's a good thing. */
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if (con->in_seq > con->in_seq_acked) {
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con->in_seq_acked = con->in_seq;
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con->out_kvec[v].iov_base = &tag_ack;
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con->out_kvec[v++].iov_len = 1;
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con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
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con->out_kvec[v].iov_base = &con->out_temp_ack;
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con->out_kvec[v++].iov_len = sizeof(con->out_temp_ack);
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con->out_kvec_bytes = 1 + sizeof(con->out_temp_ack);
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}
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m = list_first_entry(&con->out_queue,
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struct ceph_msg, list_head);
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con->out_msg = m;
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if (test_bit(LOSSYTX, &con->state)) {
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list_del_init(&m->list_head);
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} else {
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/* put message on sent list */
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ceph_msg_get(m);
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list_move_tail(&m->list_head, &con->out_sent);
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}
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m->hdr.seq = cpu_to_le64(++con->out_seq);
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dout("prepare_write_message %p seq %lld type %d len %d+%d+%d %d pgs\n",
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m, con->out_seq, le16_to_cpu(m->hdr.type),
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le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
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|
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;
|
|
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("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 = 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! */
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
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);
|
|
|
|
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.
|
|
*/
|
|
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);
|
|
} 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);
|
|
|
|
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, len,
|
|
MSG_DONTWAIT | MSG_NOSIGNAL |
|
|
MSG_MORE);
|
|
|
|
if (crc && (msg->pages || msg->pagelist))
|
|
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 (msg->pagelist)
|
|
list_move_tail(&page->lru,
|
|
&msg->pagelist->head);
|
|
}
|
|
}
|
|
|
|
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;
|
|
|
|
memset(ss, 0, sizeof(*ss));
|
|
if (in4_pton(p, end - p, (u8 *)&in4->sin_addr.s_addr,
|
|
',', &ipend)) {
|
|
ss->ss_family = AF_INET;
|
|
} else if (in6_pton(p, end - p, (u8 *)&in6->sin6_addr.s6_addr,
|
|
',', &ipend)) {
|
|
ss->ss_family = AF_INET6;
|
|
} else {
|
|
goto bad;
|
|
}
|
|
p = ipend;
|
|
|
|
/* 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", 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/%lld, got %s/%lld\n",
|
|
pr_addr(&con->peer_addr.in_addr),
|
|
le64_to_cpu(con->peer_addr.nonce),
|
|
pr_addr(&con->actual_peer_addr.in_addr),
|
|
le64_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++;
|
|
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 left;
|
|
int ret;
|
|
|
|
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);
|
|
/*
|
|
* 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, left;
|
|
unsigned front_len, middle_len, data_len, data_off;
|
|
int datacrc = con->msgr->nocrc;
|
|
int skip;
|
|
|
|
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);
|
|
|
|
/* 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);
|
|
con->in_msg = ceph_alloc_msg(con, &con->in_hdr, &skip);
|
|
if (skip) {
|
|
/* skip this message */
|
|
dout("alloc_msg returned NULL, skipping message\n");
|
|
con->in_base_pos = -front_len - middle_len - data_len -
|
|
sizeof(m->footer);
|
|
con->in_tag = CEPH_MSGR_TAG_READY;
|
|
return 0;
|
|
}
|
|
if (IS_ERR(con->in_msg)) {
|
|
ret = PTR_ERR(con->in_msg);
|
|
con->in_msg = NULL;
|
|
con->error_msg =
|
|
"error allocating memory for incoming message";
|
|
return ret;
|
|
}
|
|
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;
|
|
con->in_msg_pos.page_pos = data_off & ~PAGE_MASK;
|
|
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;
|
|
}
|
|
|
|
/* (page) data */
|
|
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));
|
|
BUG_ON(m->pages == NULL);
|
|
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]);
|
|
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++;
|
|
}
|
|
}
|
|
|
|
/* 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.name;
|
|
|
|
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.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),
|
|
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));
|
|
|
|
mutex_lock(&con->mutex);
|
|
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:
|
|
mutex_unlock(&con->mutex);
|
|
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)
|
|
{
|
|
struct ceph_messenger *msgr;
|
|
int ret = -1;
|
|
|
|
if (!con->sock)
|
|
return 0;
|
|
|
|
if (test_bit(STANDBY, &con->state))
|
|
return 0;
|
|
|
|
dout("try_read start on %p\n", con);
|
|
msgr = con->msgr;
|
|
|
|
mutex_lock(&con->mutex);
|
|
|
|
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:
|
|
mutex_unlock(&con->mutex);
|
|
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);
|
|
|
|
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) {
|
|
backoff = 1;
|
|
ceph_fault(con); /* error/fault path */
|
|
}
|
|
|
|
done:
|
|
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 = alloc_page(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.name = con->msgr->inst.name;
|
|
msg->hdr.src.addr = con->msgr->my_enc_addr;
|
|
msg->hdr.orig_src = msg->hdr.src;
|
|
|
|
BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
|
|
|
|
/* 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\n", con, msg);
|
|
list_del_init(&msg->list_head);
|
|
ceph_msg_put(msg);
|
|
msg->hdr.seq = 0;
|
|
if (con->out_msg == msg) {
|
|
ceph_msg_put(con->out_msg);
|
|
con->out_msg = NULL;
|
|
}
|
|
if (con->out_kvec_is_msg) {
|
|
con->out_skip = con->out_kvec_bytes;
|
|
con->out_kvec_is_msg = false;
|
|
}
|
|
} else {
|
|
dout("con_revoke %p msg %p - not queued (sent?)\n", con, msg);
|
|
}
|
|
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;
|
|
} 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,
|
|
int page_len, int page_off, struct page **pages)
|
|
{
|
|
struct ceph_msg *m;
|
|
|
|
m = kmalloc(sizeof(*m), GFP_NOFS);
|
|
if (m == NULL)
|
|
goto out;
|
|
kref_init(&m->kref);
|
|
INIT_LIST_HEAD(&m->list_head);
|
|
|
|
m->hdr.type = cpu_to_le16(type);
|
|
m->hdr.front_len = cpu_to_le32(front_len);
|
|
m->hdr.middle_len = 0;
|
|
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->footer.front_crc = 0;
|
|
m->footer.middle_crc = 0;
|
|
m->footer.data_crc = 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, GFP_NOFS,
|
|
PAGE_KERNEL);
|
|
m->front_is_vmalloc = true;
|
|
} else {
|
|
m->front.iov_base = kmalloc(front_len, GFP_NOFS);
|
|
}
|
|
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 = calc_pages_for(page_off, page_len);
|
|
m->pages = pages;
|
|
m->pagelist = NULL;
|
|
|
|
dout("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:
|
|
pr_err("msg_new can't create type %d len %d\n", type, front_len);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
/*
|
|
* 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 (IS_ERR(msg))
|
|
return msg;
|
|
|
|
if (*skip)
|
|
return NULL;
|
|
}
|
|
if (!msg) {
|
|
*skip = 0;
|
|
msg = ceph_msg_new(type, front_len, 0, 0, NULL);
|
|
if (!msg) {
|
|
pr_err("unable to allocate msg type %d len %d\n",
|
|
type, front_len);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
}
|
|
memcpy(&msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
|
|
|
|
if (middle_len) {
|
|
ret = ceph_alloc_middle(con, msg);
|
|
|
|
if (ret < 0) {
|
|
ceph_msg_put(msg);
|
|
return msg;
|
|
}
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|