cregit-Linux how code gets into the kernel

Release 4.8 net/ceph/messenger.c

Directory: net/ceph
#include <linux/ceph/ceph_debug.h>

#include <linux/crc32c.h>
#include <linux/ctype.h>
#include <linux/highmem.h>
#include <linux/inet.h>
#include <linux/kthread.h>
#include <linux/net.h>
#include <linux/nsproxy.h>
#include <linux/slab.h>
#include <linux/socket.h>
#include <linux/string.h>
#ifdef	CONFIG_BLOCK
#include <linux/bio.h>
#endif	/* CONFIG_BLOCK */
#include <linux/dns_resolver.h>
#include <net/tcp.h>

#include <linux/ceph/ceph_features.h>
#include <linux/ceph/libceph.h>
#include <linux/ceph/messenger.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/pagelist.h>
#include <linux/export.h>

/*
 * Ceph uses the messenger to exchange ceph_msg messages with other
 * hosts in the system.  The messenger provides ordered and reliable
 * delivery.  We tolerate TCP disconnects by reconnecting (with
 * exponential backoff) in the case of a fault (disconnection, bad
 * crc, protocol error).  Acks allow sent messages to be discarded by
 * the sender.
 */

/*
 * We track the state of the socket on a given connection using
 * values defined below.  The transition to a new socket state is
 * handled by a function which verifies we aren't coming from an
 * unexpected state.
 *
 *      --------
 *      | NEW* |  transient initial state
 *      --------
 *          | con_sock_state_init()
 *          v
 *      ----------
 *      | CLOSED |  initialized, but no socket (and no
 *      ----------  TCP connection)
 *       ^      \
 *       |       \ con_sock_state_connecting()
 *       |        ----------------------
 *       |                              \
 *       + con_sock_state_closed()       \
 *       |+---------------------------    \
 *       | \                          \    \
 *       |  -----------                \    \
 *       |  | CLOSING |  socket event;  \    \
 *       |  -----------  await close     \    \
 *       |       ^                        \   |
 *       |       |                         \  |
 *       |       + con_sock_state_closing() \ |
 *       |      / \                         | |
 *       |     /   ---------------          | |
 *       |    /                   \         v v
 *       |   /                    --------------
 *       |  /    -----------------| CONNECTING |  socket created, TCP
 *       |  |   /                 --------------  connect initiated
 *       |  |   | con_sock_state_connected()
 *       |  |   v
 *      -------------
 *      | CONNECTED |  TCP connection established
 *      -------------
 *
 * State values for ceph_connection->sock_state; NEW is assumed to be 0.
 */


#define CON_SOCK_STATE_NEW		0	
/* -> CLOSED */

#define CON_SOCK_STATE_CLOSED		1	
/* -> CONNECTING */

#define CON_SOCK_STATE_CONNECTING	2	
/* -> CONNECTED or -> CLOSING */

#define CON_SOCK_STATE_CONNECTED	3	
/* -> CLOSING or -> CLOSED */

#define CON_SOCK_STATE_CLOSING		4	
/* -> CLOSED */

/*
 * connection states
 */

#define CON_STATE_CLOSED        1  
/* -> PREOPEN */

#define CON_STATE_PREOPEN       2  
/* -> CONNECTING, CLOSED */

#define CON_STATE_CONNECTING    3  
/* -> NEGOTIATING, CLOSED */

#define CON_STATE_NEGOTIATING   4  
/* -> OPEN, CLOSED */

#define CON_STATE_OPEN          5  
/* -> STANDBY, CLOSED */

#define CON_STATE_STANDBY       6  
/* -> PREOPEN, CLOSED */

/*
 * ceph_connection flag bits
 */

#define CON_FLAG_LOSSYTX           0  
/* we can close channel or drop
                                       * messages on errors */

#define CON_FLAG_KEEPALIVE_PENDING 1  
/* we need to send a keepalive */

#define CON_FLAG_WRITE_PENDING	   2  
/* we have data ready to send */

#define CON_FLAG_SOCK_CLOSED	   3  
/* socket state changed to closed */

#define CON_FLAG_BACKOFF           4  
/* need to retry queuing delayed work */


static bool con_flag_valid(unsigned long con_flag) { switch (con_flag) { case CON_FLAG_LOSSYTX: case CON_FLAG_KEEPALIVE_PENDING: case CON_FLAG_WRITE_PENDING: case CON_FLAG_SOCK_CLOSED: case CON_FLAG_BACKOFF: return true; default: return false; } }

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static void con_flag_clear(struct ceph_connection *con, unsigned long con_flag) { BUG_ON(!con_flag_valid(con_flag)); clear_bit(con_flag, &con->flags); }

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static void con_flag_set(struct ceph_connection *con, unsigned long con_flag) { BUG_ON(!con_flag_valid(con_flag)); set_bit(con_flag, &con->flags); }

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static bool con_flag_test(struct ceph_connection *con, unsigned long con_flag) { BUG_ON(!con_flag_valid(con_flag)); return test_bit(con_flag, &con->flags); }

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static bool con_flag_test_and_clear(struct ceph_connection *con, unsigned long con_flag) { BUG_ON(!con_flag_valid(con_flag)); return test_and_clear_bit(con_flag, &con->flags); }

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static bool con_flag_test_and_set(struct ceph_connection *con, unsigned long con_flag) { BUG_ON(!con_flag_valid(con_flag)); return test_and_set_bit(con_flag, &con->flags); }

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/* Slab caches for frequently-allocated structures */ static struct kmem_cache *ceph_msg_cache; static struct kmem_cache *ceph_msg_data_cache; /* static tag bytes (protocol control messages) */ static char tag_msg = CEPH_MSGR_TAG_MSG; static char tag_ack = CEPH_MSGR_TAG_ACK; static char tag_keepalive = CEPH_MSGR_TAG_KEEPALIVE; static char tag_keepalive2 = CEPH_MSGR_TAG_KEEPALIVE2; #ifdef CONFIG_LOCKDEP static struct lock_class_key socket_class; #endif /* * When skipping (ignoring) a block of input we read it into a "skip * buffer," which is this many bytes in size. */ #define SKIP_BUF_SIZE 1024 static void queue_con(struct ceph_connection *con); static void cancel_con(struct ceph_connection *con); static void ceph_con_workfn(struct work_struct *); static void con_fault(struct ceph_connection *con); /* * Nicely render a sockaddr as a string. An array of formatted * strings is used, to approximate reentrancy. */ #define ADDR_STR_COUNT_LOG 5 /* log2(# address strings in array) */ #define ADDR_STR_COUNT (1 << ADDR_STR_COUNT_LOG) #define ADDR_STR_COUNT_MASK (ADDR_STR_COUNT - 1) #define MAX_ADDR_STR_LEN 64 /* 54 is enough */ static char addr_str[ADDR_STR_COUNT][MAX_ADDR_STR_LEN]; static atomic_t addr_str_seq = ATOMIC_INIT(0); static struct page *zero_page; /* used in certain error cases */
const char *ceph_pr_addr(const struct sockaddr_storage *ss) { int i; char *s; struct sockaddr_in *in4 = (struct sockaddr_in *) ss; struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss; i = atomic_inc_return(&addr_str_seq) & ADDR_STR_COUNT_MASK; s = addr_str[i]; switch (ss->ss_family) { case AF_INET: snprintf(s, MAX_ADDR_STR_LEN, "%pI4:%hu", &in4->sin_addr, ntohs(in4->sin_port)); break; case AF_INET6: snprintf(s, MAX_ADDR_STR_LEN, "[%pI6c]:%hu", &in6->sin6_addr, ntohs(in6->sin6_port)); break; default: snprintf(s, MAX_ADDR_STR_LEN, "(unknown sockaddr family %hu)", ss->ss_family); } return s; }

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EXPORT_SYMBOL(ceph_pr_addr);
static void encode_my_addr(struct ceph_messenger *msgr) { memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr)); ceph_encode_addr(&msgr->my_enc_addr); }

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/* * work queue for all reading and writing to/from the socket. */ static struct workqueue_struct *ceph_msgr_wq;
static int ceph_msgr_slab_init(void) { BUG_ON(ceph_msg_cache); ceph_msg_cache = KMEM_CACHE(ceph_msg, 0); if (!ceph_msg_cache) return -ENOMEM; BUG_ON(ceph_msg_data_cache); ceph_msg_data_cache = KMEM_CACHE(ceph_msg_data, 0); if (ceph_msg_data_cache) return 0; kmem_cache_destroy(ceph_msg_cache); ceph_msg_cache = NULL; return -ENOMEM; }

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static void ceph_msgr_slab_exit(void) { BUG_ON(!ceph_msg_data_cache); kmem_cache_destroy(ceph_msg_data_cache); ceph_msg_data_cache = NULL; BUG_ON(!ceph_msg_cache); kmem_cache_destroy(ceph_msg_cache); ceph_msg_cache = NULL; }

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static void _ceph_msgr_exit(void) { if (ceph_msgr_wq) { destroy_workqueue(ceph_msgr_wq); ceph_msgr_wq = NULL; } BUG_ON(zero_page == NULL); put_page(zero_page); zero_page = NULL; ceph_msgr_slab_exit(); }

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benoit canetbenoit canet37.14%120.00%
kirill a. shutemovkirill a. shutemov12.38%120.00%
Total42100.00%5100.00%


int ceph_msgr_init(void) { if (ceph_msgr_slab_init()) return -ENOMEM; BUG_ON(zero_page != NULL); zero_page = ZERO_PAGE(0); get_page(zero_page); /* * The number of active work items is limited by the number of * connections, so leave @max_active at default. */ ceph_msgr_wq = alloc_workqueue("ceph-msgr", WQ_MEM_RECLAIM, 0); if (ceph_msgr_wq) return 0; pr_err("msgr_init failed to create workqueue\n"); _ceph_msgr_exit(); return -ENOMEM; }

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tejun heotejun heo46.06%112.50%
ilya dryomovilya dryomov23.03%112.50%
kirill a. shutemovkirill a. shutemov11.52%112.50%
Total66100.00%8100.00%

EXPORT_SYMBOL(ceph_msgr_init);
void ceph_msgr_exit(void) { BUG_ON(ceph_msgr_wq == NULL); _ceph_msgr_exit(); }

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EXPORT_SYMBOL(ceph_msgr_exit);
void ceph_msgr_flush(void) { flush_workqueue(ceph_msgr_wq); }

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EXPORT_SYMBOL(ceph_msgr_flush); /* Connection socket state transition functions */
static void con_sock_state_init(struct ceph_connection *con) { int old_state; old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); if (WARN_ON(old_state != CON_SOCK_STATE_NEW)) printk("%s: unexpected old state %d\n", __func__, old_state); dout("%s con %p sock %d -> %d\n", __func__, con, old_state, CON_SOCK_STATE_CLOSED); }

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static void con_sock_state_connecting(struct ceph_connection *con) { int old_state; old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTING); if (WARN_ON(old_state != CON_SOCK_STATE_CLOSED)) printk("%s: unexpected old state %d\n", __func__, old_state); dout("%s con %p sock %d -> %d\n", __func__, con, old_state, CON_SOCK_STATE_CONNECTING); }

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static void con_sock_state_connected(struct ceph_connection *con) { int old_state; old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CONNECTED); if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING)) printk("%s: unexpected old state %d\n", __func__, old_state); dout("%s con %p sock %d -> %d\n", __func__, con, old_state, CON_SOCK_STATE_CONNECTED); }

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static void con_sock_state_closing(struct ceph_connection *con) { int old_state; old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSING); if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTING && old_state != CON_SOCK_STATE_CONNECTED && old_state != CON_SOCK_STATE_CLOSING)) printk("%s: unexpected old state %d\n", __func__, old_state); dout("%s con %p sock %d -> %d\n", __func__, con, old_state, CON_SOCK_STATE_CLOSING); }

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static void con_sock_state_closed(struct ceph_connection *con) { int old_state; old_state = atomic_xchg(&con->sock_state, CON_SOCK_STATE_CLOSED); if (WARN_ON(old_state != CON_SOCK_STATE_CONNECTED && old_state != CON_SOCK_STATE_CLOSING && old_state != CON_SOCK_STATE_CONNECTING && old_state != CON_SOCK_STATE_CLOSED)) printk("%s: unexpected old state %d\n", __func__, old_state); dout("%s con %p sock %d -> %d\n", __func__, con, old_state, CON_SOCK_STATE_CLOSED); }

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/* * socket callback functions */ /* data available on socket, or listen socket received a connect */
static void ceph_sock_data_ready(struct sock *sk) { struct ceph_connection *con = sk->sk_user_data; if (atomic_read(&con->msgr->stopping)) { return; } if (sk->sk_state != TCP_CLOSE_WAIT) { dout("%s on %p state = %lu, queueing work\n", __func__, con, con->state); queue_con(con); } }

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/* socket has buffer space for writing */
static void ceph_sock_write_space(struct sock *sk) { struct ceph_connection *con = sk->sk_user_data; /* only queue to workqueue if there is data we want to write, * and there is sufficient space in the socket buffer to accept * more data. clear SOCK_NOSPACE so that ceph_sock_write_space() * doesn't get called again until try_write() fills the socket * buffer. See net/ipv4/tcp_input.c:tcp_check_space() * and net/core/stream.c:sk_stream_write_space(). */ if (con_flag_test(con, CON_FLAG_WRITE_PENDING)) { if (sk_stream_is_writeable(sk)) { dout("%s %p queueing write work\n", __func__, con); clear_bit(SOCK_NOSPACE, &sk->sk_socket->flags); queue_con(con); } } else { dout("%s %p nothing to write\n", __func__, con); } }

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Total79100.00%5100.00%

/* socket's state has changed */
static void ceph_sock_state_change(struct sock *sk) { struct ceph_connection *con = sk->sk_user_data; dout("%s %p state = %lu sk_state = %u\n", __func__, con, con->state, sk->sk_state); switch (sk->sk_state) { case TCP_CLOSE: dout("%s TCP_CLOSE\n", __func__); case TCP_CLOSE_WAIT: dout("%s TCP_CLOSE_WAIT\n", __func__); con_sock_state_closing(con); con_flag_set(con, CON_FLAG_SOCK_CLOSED); queue_con(con); break; case TCP_ESTABLISHED: dout("%s TCP_ESTABLISHED\n", __func__); con_sock_state_connected(con); queue_con(con); break; default: /* Everything else is uninteresting */ break; } }

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/* * set up socket callbacks */
static void set_sock_callbacks(struct socket *sock, struct ceph_connection *con) { struct sock *sk = sock->sk; sk->sk_user_data = con; sk->sk_data_ready = ceph_sock_data_ready; sk->sk_write_space = ceph_sock_write_space; sk->sk_state_change = ceph_sock_state_change; }

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/* * socket helpers */ /* * initiate connection to a remote socket. */
static int ceph_tcp_connect(struct ceph_connection *con) { struct sockaddr_storage *paddr = &con->peer_addr.in_addr; struct socket *sock; int ret; BUG_ON(con->sock); ret = sock_create_kern(read_pnet(&con->msgr->net), paddr->ss_family, SOCK_STREAM, IPPROTO_TCP, &sock); if (ret) return ret; sock->sk->sk_allocation = GFP_NOFS; #ifdef CONFIG_LOCKDEP lockdep_set_class(&sock->sk->sk_lock, &socket_class); #endif set_sock_callbacks(sock, con); dout("connect %s\n", ceph_pr_addr(&con->peer_addr.in_addr)); con_sock_state_connecting(con); ret = sock->ops->connect(sock, (struct sockaddr *)paddr, sizeof(*paddr), O_NONBLOCK); if (ret == -EINPROGRESS) { dout("connect %s EINPROGRESS sk_state = %u\n", ceph_pr_addr(&con->peer_addr.in_addr), sock->sk->sk_state); } else if (ret < 0) { pr_err("connect %s error %d\n", ceph_pr_addr(&con->peer_addr.in_addr), ret); sock_release(sock); return ret; } if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) { int optval = 1; ret = kernel_setsockopt(sock, SOL_TCP, TCP_NODELAY, (char *)&optval, sizeof(optval)); if (ret) pr_err("kernel_setsockopt(TCP_NODELAY) failed: %d", ret); } con->sock = sock; return 0; }

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alex elderalex elder103.60%218.18%
yehuda sadehyehuda sadeh31.08%19.09%
eric w. biedermaneric w. biederman10.36%19.09%
Total278100.00%11100.00%


static int ceph_tcp_recvmsg(struct socket *sock, void *buf, size_t len) { struct kvec iov = {buf, len}; struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; int r; r = kernel_recvmsg(sock, &msg, &iov, 1, len, msg.msg_flags); if (r == -EAGAIN) r = 0; return r; }

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static int ceph_tcp_recvpage(struct socket *sock, struct page *page, int page_offset, size_t length) { void *kaddr; int ret; BUG_ON(page_offset + length > PAGE_SIZE); kaddr = kmap(page); BUG_ON(!kaddr); ret = ceph_tcp_recvmsg(sock, kaddr + page_offset, length); kunmap(page); return ret; }

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/* * write something. @more is true if caller will be sending more data * shortly. */
static int ceph_tcp_sendmsg(struct socket *sock, struct kvec *iov, size_t kvlen, size_t len, int more) { struct msghdr msg = { .msg_flags = MSG_DONTWAIT | MSG_NOSIGNAL }; int r; if (more) msg.msg_flags |= MSG_MORE; else msg.msg_flags |= MSG_EOR; /* superfluous, but what the hell */ r = kernel_sendmsg(sock, &msg, iov, kvlen, len); if (r == -EAGAIN) r = 0; return r; }

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static int __ceph_tcp_sendpage(struct socket *sock, struct page *page, int offset, size_t size, bool more) { int flags = MSG_DONTWAIT | MSG_NOSIGNAL | (more ? MSG_MORE : MSG_EOR); int ret; ret = kernel_sendpage(sock, page, offset, size, flags); if (ret == -EAGAIN) ret = 0; return ret; }

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static int ceph_tcp_sendpage(struct socket *sock, struct page *page, int offset, size_t size, bool more) { int ret; struct kvec iov; /* sendpage cannot properly handle pages with page_count == 0, * we need to fallback to sendmsg if that's the case */ if (page_count(page) >= 1) return __ceph_tcp_sendpage(sock, page, offset, size, more); iov.iov_base = kmap(page) + offset; iov.iov_len = size; ret = ceph_tcp_sendmsg(sock, &iov, 1, size, more); kunmap(page); return ret; }

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/* * Shutdown/close the socket for the given connection. */
static int con_close_socket(struct ceph_connection *con) { int rc = 0; dout("con_close_socket on %p sock %p\n", con, con->sock); if (con->sock) { rc = con->sock->ops->shutdown(con->sock, SHUT_RDWR); sock_release(con->sock); con->sock = NULL; } /* * Forcibly clear the SOCK_CLOSED flag. It gets set * independent of the connection mutex, and we could have * received a socket close event before we had the chance to * shut the socket down. */ con_flag_clear(con, CON_FLAG_SOCK_CLOSED); con_sock_state_closed(con); return rc; }

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/* * Reset a connection. Discard all incoming and outgoing messages * and clear *_seq state. */
static void ceph_msg_remove(struct ceph_msg *msg) { list_del_init(&msg->list_head); ceph_msg_put(msg); }

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static void ceph_msg_remove_list(struct list_head *head) { while (!list_empty(head)) { struct ceph_msg *msg = list_first_entry(head, struct ceph_msg, list_head); ceph_msg_remove(msg); } }

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static void reset_connection(struct ceph_connection *con) { /* reset connection, out_queue, msg_ and connect_seq */ /* discard existing out_queue and msg_seq */ dout("reset_connection %p\n", con); ceph_msg_remove_list(&con->out_queue); ceph_msg_remove_list(&con->out_sent); if (con->in_msg) { BUG_ON(con->in_msg->con != con); ceph_msg_put(con->in_msg); con->in_msg = NULL; } con->connect_seq = 0; con->out_seq = 0; if (con->out_msg) { BUG_ON(con->out_msg->con != con); ceph_msg_put(con->out_msg); con->out_msg = NULL; } con->in_seq = 0; con->in_seq_acked = 0; con->out_skip = 0; }

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alex elderalex elder118.46%112.50%
Total130100.00%8100.00%

/* * mark a peer down. drop any open connections. */
void ceph_con_close(struct ceph_connection *con) { mutex_lock(&con->mutex); dout("con_close %p peer %s\n", con, ceph_pr_addr(&con->peer_addr.in_addr)); con->state = CON_STATE_CLOSED; con_flag_clear(con, CON_FLAG_LOSSYTX); /* so we retry next connect */ con_flag_clear(con, CON_FLAG_KEEPALIVE_PENDING); con_flag_clear(con, CON_FLAG_WRITE_PENDING); con_flag_clear(con, CON_FLAG_BACKOFF); reset_connection(con); con->peer_global_seq = 0; cancel_con(con); con_close_socket(con); mutex_unlock(&con->mutex); }

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PersonTokensPropCommitsCommitProp
sage weilsage weil8686.87%872.73%
alex elderalex elder1111.11%19.09%
yehuda sadehyehuda sadeh11.01%19.09%
ilya dryomovilya dryomov11.01%19.09%
Total99100.00%11100.00%

EXPORT_SYMBOL(ceph_con_close); /* * Reopen a closed connection, with a new peer address. */
void ceph_con_open(struct ceph_connection *con, __u8 entity_type, __u64 entity_num, struct ceph_entity_addr *addr) { mutex_lock(&con->mutex); dout("con_open %p %s\n", con, ceph_pr_addr(&addr->in_addr)); WARN_ON(con->state != CON_STATE_CLOSED); con->state = CON_STATE_PREOPEN; con->peer_name.type = (__u8) entity_type; con->peer_name.num = cpu_to_le64(entity_num); memcpy(&con->peer_addr, addr, sizeof(*addr)); con->delay = 0; /* reset backoff memory */ mutex_unlock(&con->mutex); queue_con(con); }

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PersonTokensPropCommitsCommitProp
sage weilsage weil11598.29%571.43%
yehuda sadehyehuda sadeh10.85%114.29%
alex elderalex elder10.85%114.29%
Total117100.00%7100.00%

EXPORT_SYMBOL(ceph_con_open); /* * return true if this connection ever successfully opened */
bool ceph_con_opened(struct ceph_connection *con) { return con->connect_seq > 0; }

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PersonTokensPropCommitsCommitProp
sage weilsage weil17100.00%1100.00%
Total17100.00%1100.00%

/* * initialize a new connection. */
void ceph_con_init(struct ceph_connection *con, void *private, const struct ceph_connection_operations *ops, struct ceph_messenger *msgr) { dout("con_init %p\n", con); memset(con, 0, sizeof(*con)); con->private = private; con->ops = ops; con->msgr = msgr; con_sock_state_init(con); mutex_init(&con->mutex); INIT_LIST_HEAD(&con->out_queue); INIT_LIST_HEAD(&con->out_sent); INIT_DELAYED_WORK(&con->work, ceph_con_workfn); con->state = CON_STATE_CLOSED; }

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PersonTokensPropCommitsCommitProp
sage weilsage weil8175.00%342.86%
alex elderalex elder2624.07%342.86%
ilya dryomovilya dryomov10.93%114.29%
Total108100.00%7100.00%

EXPORT_SYMBOL(ceph_con_init); /* * We maintain a global counter to order connection attempts. Get * a unique seq greater than @gt. */
static u32 get_global_seq(struct ceph_messenger *msgr, u32 gt) { u32 ret; spin_lock(&msgr->global_seq_lock); if (msgr->global_seq < gt) msgr->global_seq = gt; ret = ++msgr->global_seq; spin_unlock(&msgr->global_seq_lock); return ret