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linux/net/ceph/messenger.c
Peter Zijlstra 2c935bc572 locking/atomic, kref: Add kref_read() 
Since we need to change the implementation, stop exposing internals.

Provide kref_read() to read the current reference count; typically
used for debug messages.

Kills two anti-patterns:

	atomic_read(&kref->refcount)
	kref->refcount.counter

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2017-01-14 11:37:18 +01:00

3462 lines
85 KiB
C
Raw Blame History

#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;
}
}
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);
}
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);
}
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);
}
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);
}
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);
}
/* 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;
}
EXPORT_SYMBOL(ceph_pr_addr);
static void encode_my_addr(struct ceph_messenger *msgr)
{
memcpy(&msgr->my_enc_addr, &msgr->inst.addr, sizeof(msgr->my_enc_addr));
ceph_encode_addr(&msgr->my_enc_addr);
}
/*
* work queue for all reading and writing to/from the socket.
*/
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;
}
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;
}
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();
}
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;
}
EXPORT_SYMBOL(ceph_msgr_init);
void ceph_msgr_exit(void)
{
BUG_ON(ceph_msgr_wq == NULL);
_ceph_msgr_exit();
}
EXPORT_SYMBOL(ceph_msgr_exit);
void ceph_msgr_flush(void)
{
flush_workqueue(ceph_msgr_wq);
}
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);
}
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);
}
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);
}
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);
}
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);
}
/*
* 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);
}
}
/* 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);
}
}
/* 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;
}
}
/*
* 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;
}
/*
* 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;
}
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;
}
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;
}
/*
* 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;
}
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;
}
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;
}
/*
* 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;
}
/*
* Reset a connection. Discard all incoming and outgoing messages
* and clear *_seq state.
*/
static void ceph_msg_remove(struct ceph_msg *msg)
{
list_del_init(&msg->list_head);
ceph_msg_put(msg);
}
static void ceph_msg_remove_list(struct list_head *head)
{
while (!list_empty(head)) {
struct ceph_msg *msg = list_first_entry(head, struct ceph_msg,
list_head);
ceph_msg_remove(msg);
}
}
static void reset_connection(struct ceph_connection *con)
{
/* reset connection, out_queue, msg_ and connect_seq */
/* discard existing out_queue and msg_seq */
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;
}
/*
* 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);
}
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);
}
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;
}
/*
* 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;
}
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;
}
static void con_out_kvec_reset(struct ceph_connection *con)
{
BUG_ON(con->out_skip);
con->out_kvec_left = 0;
con->out_kvec_bytes = 0;
con->out_kvec_cur = &con->out_kvec[0];
}
static void con_out_kvec_add(struct ceph_connection *con,
size_t size, void *data)
{
int index = con->out_kvec_left;
BUG_ON(con->out_skip);
BUG_ON(index >= ARRAY_SIZE(con->out_kvec));
con->out_kvec[index].iov_len = size;
con->out_kvec[index].iov_base = data;
con->out_kvec_left++;
con->out_kvec_bytes += size;
}
/*
* Chop off a kvec from the end. Return residual number of bytes for
* that kvec, i.e. how many bytes would have been written if the kvec
* hadn't been nuked.
*/
static int con_out_kvec_skip(struct ceph_connection *con)
{
int off = con->out_kvec_cur - con->out_kvec;
int skip = 0;
if (con->out_kvec_bytes > 0) {
skip = con->out_kvec[off + con->out_kvec_left - 1].iov_len;
BUG_ON(con->out_kvec_bytes < skip);
BUG_ON(!con->out_kvec_left);
con->out_kvec_bytes -= skip;
con->out_kvec_left--;
}
return skip;
}
#ifdef CONFIG_BLOCK
/*
* For a bio data item, a piece is whatever remains of the next
* entry in the current bio iovec, or the first entry in the next
* bio in the list.
*/
static void ceph_msg_data_bio_cursor_init(struct ceph_msg_data_cursor *cursor,
size_t length)
{
struct ceph_msg_data *data = cursor->data;
struct bio *bio;
BUG_ON(data->type != CEPH_MSG_DATA_BIO);
bio = data->bio;
BUG_ON(!bio);
cursor->resid = min(length, data->bio_length);
cursor->bio = bio;
cursor->bvec_iter = bio->bi_iter;
cursor->last_piece =
cursor->resid <= bio_iter_len(bio, cursor->bvec_iter);
}
static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor,
size_t *page_offset,
size_t *length)
{
struct ceph_msg_data *data = cursor->data;
struct bio *bio;
struct bio_vec bio_vec;
BUG_ON(data->type != CEPH_MSG_DATA_BIO);
bio = cursor->bio;
BUG_ON(!bio);
bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
*page_offset = (size_t) bio_vec.bv_offset;
BUG_ON(*page_offset >= PAGE_SIZE);
if (cursor->last_piece) /* pagelist offset is always 0 */
*length = cursor->resid;
else
*length = (size_t) bio_vec.bv_len;
BUG_ON(*length > cursor->resid);
BUG_ON(*page_offset + *length > PAGE_SIZE);
return bio_vec.bv_page;
}
static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor,
size_t bytes)
{
struct bio *bio;
struct bio_vec bio_vec;
BUG_ON(cursor->data->type != CEPH_MSG_DATA_BIO);
bio = cursor->bio;
BUG_ON(!bio);
bio_vec = bio_iter_iovec(bio, cursor->bvec_iter);
/* Advance the cursor offset */
BUG_ON(cursor->resid < bytes);
cursor->resid -= bytes;
bio_advance_iter(bio, &cursor->bvec_iter, bytes);
if (bytes < bio_vec.bv_len)
return false; /* more bytes to process in this segment */
/* Move on to the next segment, and possibly the next bio */
if (!cursor->bvec_iter.bi_size) {
bio = bio->bi_next;
cursor->bio = bio;
if (bio)
cursor->bvec_iter = bio->bi_iter;
else
memset(&cursor->bvec_iter, 0,
sizeof(cursor->bvec_iter));
}
if (!cursor->last_piece) {
BUG_ON(!cursor->resid);
BUG_ON(!bio);
/* A short read is OK, so use <= rather than == */
if (cursor->resid <= bio_iter_len(bio, cursor->bvec_iter))
cursor->last_piece = true;
}
return true;
}
#endif /* CONFIG_BLOCK */
/*
* For a page array, a piece comes from the first page in the array
* that has not already been fully consumed.
*/
static void ceph_msg_data_pages_cursor_init(struct ceph_msg_data_cursor *cursor,
size_t length)
{
struct ceph_msg_data *data = cursor->data;
int page_count;
BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
BUG_ON(!data->pages);
BUG_ON(!data->length);
cursor->resid = min(length, data->length);
page_count = calc_pages_for(data->alignment, (u64)data->length);
cursor->page_offset = data->alignment & ~PAGE_MASK;
cursor->page_index = 0;
BUG_ON(page_count > (int)USHRT_MAX);
cursor->page_count = (unsigned short)page_count;
BUG_ON(length > SIZE_MAX - cursor->page_offset);
cursor->last_piece = cursor->page_offset + cursor->resid <= PAGE_SIZE;
}
static struct page *
ceph_msg_data_pages_next(struct ceph_msg_data_cursor *cursor,
size_t *page_offset, size_t *length)
{
struct ceph_msg_data *data = cursor->data;
BUG_ON(data->type != CEPH_MSG_DATA_PAGES);
BUG_ON(cursor->page_index >= cursor->page_count);
BUG_ON(cursor->page_offset >= PAGE_SIZE);
*page_offset = cursor->page_offset;
if (cursor->last_piece)
*length = cursor->resid;
else
*length = PAGE_SIZE - *page_offset;
return data->pages[cursor->page_index];
}
static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor,
size_t bytes)
{
BUG_ON(cursor->data->type != CEPH_MSG_DATA_PAGES);
BUG_ON(cursor->page_offset + bytes > PAGE_SIZE);
/* Advance the cursor page offset */
cursor->resid -= bytes;
cursor->page_offset = (cursor->page_offset + bytes) & ~PAGE_MASK;
if (!bytes || cursor->page_offset)
return false; /* more bytes to process in the current page */
if (!cursor->resid)
return false; /* no more data */
/* Move on to the next page; offset is already at 0 */
BUG_ON(cursor->page_index >= cursor->page_count);
cursor->page_index++;
cursor->last_piece = cursor->resid <= PAGE_SIZE;
return true;
}
/*
* For a pagelist, a piece is whatever remains to be consumed in the
* first page in the list, or the front of the next page.
*/
static void
ceph_msg_data_pagelist_cursor_init(struct ceph_msg_data_cursor *cursor,
size_t length)
{
struct ceph_msg_data *data = cursor->data;
struct ceph_pagelist *pagelist;
struct page *page;
BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
pagelist = data->pagelist;
BUG_ON(!pagelist);
if (!length)
return; /* pagelist can be assigned but empty */
BUG_ON(list_empty(&pagelist->head));
page = list_first_entry(&pagelist->head, struct page, lru);
cursor->resid = min(length, pagelist->length);
cursor->page = page;
cursor->offset = 0;
cursor->last_piece = cursor->resid <= PAGE_SIZE;
}
static struct page *
ceph_msg_data_pagelist_next(struct ceph_msg_data_cursor *cursor,
size_t *page_offset, size_t *length)
{
struct ceph_msg_data *data = cursor->data;
struct ceph_pagelist *pagelist;
BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
pagelist = data->pagelist;
BUG_ON(!pagelist);
BUG_ON(!cursor->page);
BUG_ON(cursor->offset + cursor->resid != pagelist->length);
/* offset of first page in pagelist is always 0 */
*page_offset = cursor->offset & ~PAGE_MASK;
if (cursor->last_piece)
*length = cursor->resid;
else
*length = PAGE_SIZE - *page_offset;
return cursor->page;
}
static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor,
size_t bytes)
{
struct ceph_msg_data *data = cursor->data;
struct ceph_pagelist *pagelist;
BUG_ON(data->type != CEPH_MSG_DATA_PAGELIST);
pagelist = data->pagelist;
BUG_ON(!pagelist);
BUG_ON(cursor->offset + cursor->resid != pagelist->length);
BUG_ON((cursor->offset & ~PAGE_MASK) + bytes > PAGE_SIZE);
/* Advance the cursor offset */
cursor->resid -= bytes;
cursor->offset += bytes;
/* offset of first page in pagelist is always 0 */
if (!bytes || cursor->offset & ~PAGE_MASK)
return false; /* more bytes to process in the current page */
if (!cursor->resid)
return false; /* no more data */
/* Move on to the next page */
BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head));
cursor->page = list_next_entry(cursor->page, lru);
cursor->last_piece = cursor->resid <= PAGE_SIZE;
return true;
}
/*
* Message data is handled (sent or received) in pieces, where each
* piece resides on a single page. The network layer might not
* consume an entire piece at once. A data item's cursor keeps
* track of which piece is next to process and how much remains to
* be processed in that piece. It also tracks whether the current
* piece is the last one in the data item.
*/
static void __ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor)
{
size_t length = cursor->total_resid;
switch (cursor->data->type) {
case CEPH_MSG_DATA_PAGELIST:
ceph_msg_data_pagelist_cursor_init(cursor, length);
break;
case CEPH_MSG_DATA_PAGES:
ceph_msg_data_pages_cursor_init(cursor, length);
break;
#ifdef CONFIG_BLOCK
case CEPH_MSG_DATA_BIO:
ceph_msg_data_bio_cursor_init(cursor, length);
break;
#endif /* CONFIG_BLOCK */
case CEPH_MSG_DATA_NONE:
default:
/* BUG(); */
break;
}
cursor->need_crc = true;
}
static void ceph_msg_data_cursor_init(struct ceph_msg *msg, size_t length)
{
struct ceph_msg_data_cursor *cursor = &msg->cursor;
struct ceph_msg_data *data;
BUG_ON(!length);
BUG_ON(length > msg->data_length);
BUG_ON(list_empty(&msg->data));
cursor->data_head = &msg->data;
cursor->total_resid = length;
data = list_first_entry(&msg->data, struct ceph_msg_data, links);
cursor->data = data;
__ceph_msg_data_cursor_init(cursor);
}
/*
* Return the page containing the next piece to process for a given
* data item, and supply the page offset and length of that piece.
* Indicate whether this is the last piece in this data item.
*/
static struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
size_t *page_offset, size_t *length,
bool *last_piece)
{
struct page *page;
switch (cursor->data->type) {
case CEPH_MSG_DATA_PAGELIST:
page = ceph_msg_data_pagelist_next(cursor, page_offset, length);
break;
case CEPH_MSG_DATA_PAGES:
page = ceph_msg_data_pages_next(cursor, page_offset, length);
break;
#ifdef CONFIG_BLOCK
case CEPH_MSG_DATA_BIO:
page = ceph_msg_data_bio_next(cursor, page_offset, length);
break;
#endif /* CONFIG_BLOCK */
case CEPH_MSG_DATA_NONE:
default:
page = NULL;
break;
}
BUG_ON(!page);
BUG_ON(*page_offset + *length > PAGE_SIZE);
BUG_ON(!*length);
if (last_piece)
*last_piece = cursor->last_piece;
return page;
}
/*
* Returns true if the result moves the cursor on to the next piece
* of the data item.
*/
static bool ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor,
size_t bytes)
{
bool new_piece;
BUG_ON(bytes > cursor->resid);
switch (cursor->data->type) {
case CEPH_MSG_DATA_PAGELIST:
new_piece = ceph_msg_data_pagelist_advance(cursor, bytes);
break;
case CEPH_MSG_DATA_PAGES:
new_piece = ceph_msg_data_pages_advance(cursor, bytes);
break;
#ifdef CONFIG_BLOCK
case CEPH_MSG_DATA_BIO:
new_piece = ceph_msg_data_bio_advance(cursor, bytes);
break;
#endif /* CONFIG_BLOCK */
case CEPH_MSG_DATA_NONE:
default:
BUG();
break;
}
cursor->total_resid -= bytes;
if (!cursor->resid && cursor->total_resid) {
WARN_ON(!cursor->last_piece);
BUG_ON(list_is_last(&cursor->data->links, cursor->data_head));
cursor->data = list_next_entry(cursor->data, links);
__ceph_msg_data_cursor_init(cursor);
new_piece = true;
}
cursor->need_crc = new_piece;
return new_piece;
}
static size_t sizeof_footer(struct ceph_connection *con)
{
return (con->peer_features & CEPH_FEATURE_MSG_AUTH) ?
sizeof(struct ceph_msg_footer) :
sizeof(struct ceph_msg_footer_old);
}
static void prepare_message_data(struct ceph_msg *msg, u32 data_len)
{
BUG_ON(!msg);
BUG_ON(!data_len);
/* Initialize data cursor */
ceph_msg_data_cursor_init(msg, (size_t)data_len);
}
/*
* Prepare footer for currently outgoing message, and finish things
* off. Assumes out_kvec* are already valid.. we just add on to the end.
*/
static void prepare_write_message_footer(struct ceph_connection *con)
{
struct ceph_msg *m = con->out_msg;
m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE;
dout("prepare_write_message_footer %p\n", con);
con_out_kvec_add(con, sizeof_footer(con), &m->footer);
if (con->peer_features & CEPH_FEATURE_MSG_AUTH) {
if (con->ops->sign_message)
con->ops->sign_message(m);
else
m->footer.sig = 0;
} else {
m->old_footer.flags = m->footer.flags;
}
con->out_more = m->more_to_follow;
con->out_msg_done = true;
}
/*
* Prepare headers for the next outgoing message.
*/
static void prepare_write_message(struct ceph_connection *con)
{
struct ceph_msg *m;
u32 crc;
con_out_kvec_reset(con);
con->out_msg_done = false;
/* Sneak an ack in there first? If we can get it into the same
* TCP packet that's a good thing. */
if (con->in_seq > con->in_seq_acked) {
con->in_seq_acked = con->in_seq;
con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
con_out_kvec_add(con, sizeof (con->out_temp_ack),
&con->out_temp_ack);
}
BUG_ON(list_empty(&con->out_queue));
m = list_first_entry(&con->out_queue, struct ceph_msg, list_head);
con->out_msg = m;
BUG_ON(m->con != con);
/* put message on sent list */
ceph_msg_get(m);
list_move_tail(&m->list_head, &con->out_sent);
/*
* only assign outgoing seq # if we haven't sent this message
* yet. if it is requeued, resend with it's original seq.
*/
if (m->needs_out_seq) {
m->hdr.seq = cpu_to_le64(++con->out_seq);
m->needs_out_seq = false;
}
WARN_ON(m->data_length != le32_to_cpu(m->hdr.data_len));
dout("prepare_write_message %p seq %lld type %d len %d+%d+%zd\n",
m, con->out_seq, le16_to_cpu(m->hdr.type),
le32_to_cpu(m->hdr.front_len), le32_to_cpu(m->hdr.middle_len),
m->data_length);
BUG_ON(le32_to_cpu(m->hdr.front_len) != m->front.iov_len);
/* tag + hdr + front + middle */
con_out_kvec_add(con, sizeof (tag_msg), &tag_msg);
con_out_kvec_add(con, sizeof(con->out_hdr), &con->out_hdr);
con_out_kvec_add(con, m->front.iov_len, m->front.iov_base);
if (m->middle)
con_out_kvec_add(con, m->middle->vec.iov_len,
m->middle->vec.iov_base);
/* fill in hdr crc and finalize hdr */
crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc));
con->out_msg->hdr.crc = cpu_to_le32(crc);
memcpy(&con->out_hdr, &con->out_msg->hdr, sizeof(con->out_hdr));
/* fill in front and middle crc, footer */
crc = crc32c(0, m->front.iov_base, m->front.iov_len);
con->out_msg->footer.front_crc = cpu_to_le32(crc);
if (m->middle) {
crc = crc32c(0, m->middle->vec.iov_base,
m->middle->vec.iov_len);
con->out_msg->footer.middle_crc = cpu_to_le32(crc);
} else
con->out_msg->footer.middle_crc = 0;
dout("%s front_crc %u middle_crc %u\n", __func__,
le32_to_cpu(con->out_msg->footer.front_crc),
le32_to_cpu(con->out_msg->footer.middle_crc));
con->out_msg->footer.flags = 0;
/* is there a data payload? */
con->out_msg->footer.data_crc = 0;
if (m->data_length) {
prepare_message_data(con->out_msg, m->data_length);
con->out_more = 1; /* data + footer will follow */
} else {
/* no, queue up footer too and be done */
prepare_write_message_footer(con);
}
con_flag_set(con, CON_FLAG_WRITE_PENDING);
}
/*
* 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_reset(con);
con_out_kvec_add(con, sizeof (tag_ack), &tag_ack);
con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
con_out_kvec_add(con, sizeof (con->out_temp_ack),
&con->out_temp_ack);
con->out_more = 1; /* more will follow.. eventually.. */
con_flag_set(con, CON_FLAG_WRITE_PENDING);
}
/*
* Prepare to share the seq during handshake
*/
static void prepare_write_seq(struct ceph_connection *con)
{
dout("prepare_write_seq %p %llu -> %llu\n", con,
con->in_seq_acked, con->in_seq);
con->in_seq_acked = con->in_seq;
con_out_kvec_reset(con);
con->out_temp_ack = cpu_to_le64(con->in_seq_acked);
con_out_kvec_add(con, sizeof (con->out_temp_ack),
&con->out_temp_ack);
con_flag_set(con, CON_FLAG_WRITE_PENDING);
}
/*
* Prepare to write keepalive byte.
*/
static void prepare_write_keepalive(struct ceph_connection *con)
{
dout("prepare_write_keepalive %p\n", con);
con_out_kvec_reset(con);
if (con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2) {
struct timespec now = CURRENT_TIME;
con_out_kvec_add(con, sizeof(tag_keepalive2), &tag_keepalive2);
ceph_encode_timespec(&con->out_temp_keepalive2, &now);
con_out_kvec_add(con, sizeof(con->out_temp_keepalive2),
&con->out_temp_keepalive2);
} else {
con_out_kvec_add(con, sizeof(tag_keepalive), &tag_keepalive);
}
con_flag_set(con, CON_FLAG_WRITE_PENDING);
}
/*
* Connection negotiation.
*/
static struct ceph_auth_handshake *get_connect_authorizer(struct ceph_connection *con,
int *auth_proto)
{
struct ceph_auth_handshake *auth;
if (!con->ops->get_authorizer) {
con->out_connect.authorizer_protocol = CEPH_AUTH_UNKNOWN;
con->out_connect.authorizer_len = 0;
return NULL;
}
auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry);
if (IS_ERR(auth))
return auth;
con->auth_reply_buf = auth->authorizer_reply_buf;
con->auth_reply_buf_len = auth->authorizer_reply_buf_len;
return auth;
}
/*
* We connected to a peer and are saying hello.
*/
static void prepare_write_banner(struct ceph_connection *con)
{
con_out_kvec_add(con, strlen(CEPH_BANNER), CEPH_BANNER);
con_out_kvec_add(con, sizeof (con->msgr->my_enc_addr),
&con->msgr->my_enc_addr);
con->out_more = 0;
con_flag_set(con, CON_FLAG_WRITE_PENDING);
}
static int prepare_write_connect(struct ceph_connection *con)
{
unsigned int global_seq = get_global_seq(con->msgr, 0);
int proto;
int auth_proto;
struct ceph_auth_handshake *auth;
switch (con->peer_name.type) {
case CEPH_ENTITY_TYPE_MON:
proto = CEPH_MONC_PROTOCOL;
break;
case CEPH_ENTITY_TYPE_OSD:
proto = CEPH_OSDC_PROTOCOL;
break;
case CEPH_ENTITY_TYPE_MDS:
proto = CEPH_MDSC_PROTOCOL;
break;
default:
BUG();
}
dout("prepare_write_connect %p cseq=%d gseq=%d proto=%d\n", con,
con->connect_seq, global_seq, proto);
con->out_connect.features =
cpu_to_le64(from_msgr(con->msgr)->supported_features);
con->out_connect.host_type = cpu_to_le32(CEPH_ENTITY_TYPE_CLIENT);
con->out_connect.connect_seq = cpu_to_le32(con->connect_seq);
con->out_connect.global_seq = cpu_to_le32(global_seq);
con->out_connect.protocol_version = cpu_to_le32(proto);
con->out_connect.flags = 0;
auth_proto = CEPH_AUTH_UNKNOWN;
auth = get_connect_authorizer(con, &auth_proto);
if (IS_ERR(auth))
return PTR_ERR(auth);
con->out_connect.authorizer_protocol = cpu_to_le32(auth_proto);
con->out_connect.authorizer_len = auth ?
cpu_to_le32(auth->authorizer_buf_len) : 0;
con_out_kvec_add(con, sizeof (con->out_connect),
&con->out_connect);
if (auth && auth->authorizer_buf_len)
con_out_kvec_add(con, auth->authorizer_buf_len,
auth->authorizer_buf);
con->out_more = 0;
con_flag_set(con, CON_FLAG_WRITE_PENDING);
return 0;
}
/*
* 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 */
/* account for full iov entries consumed */
while (ret >= con->out_kvec_cur->iov_len) {
BUG_ON(!con->out_kvec_left);
ret -= con->out_kvec_cur->iov_len;
con->out_kvec_cur++;
con->out_kvec_left--;
}
/* and for a partially-consumed entry */
if (ret) {
con->out_kvec_cur->iov_len -= ret;
con->out_kvec_cur->iov_base += ret;
}
}
con->out_kvec_left = 0;
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! */
}
static u32 ceph_crc32c_page(u32 crc, struct page *page,
unsigned int page_offset,
unsigned int length)
{
char *kaddr;
kaddr = kmap(page);
BUG_ON(kaddr == NULL);
crc = crc32c(crc, kaddr + page_offset, length);
kunmap(page);
return crc;
}
/*
* 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_message_data(struct ceph_connection *con)
{
struct ceph_msg *msg = con->out_msg;
struct ceph_msg_data_cursor *cursor = &msg->cursor;
bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
u32 crc;
dout("%s %p msg %p\n", __func__, con, msg);
if (list_empty(&msg->data))
return -EINVAL;
/*
* Iterate through each page that contains data to be
* written, and send as much as possible for each.
*
* If we are calculating the data crc (the default), we will
* need to map the page. If we have no pages, they have
* been revoked, so use the zero page.
*/
crc = do_datacrc ? le32_to_cpu(msg->footer.data_crc) : 0;
while (cursor->resid) {
struct page *page;
size_t page_offset;
size_t length;
bool last_piece;
bool need_crc;
int ret;
page = ceph_msg_data_next(cursor, &page_offset, &length,
&last_piece);
ret = ceph_tcp_sendpage(con->sock, page, page_offset,
length, !last_piece);
if (ret <= 0) {
if (do_datacrc)
msg->footer.data_crc = cpu_to_le32(crc);
return ret;
}
if (do_datacrc && cursor->need_crc)
crc = ceph_crc32c_page(crc, page, page_offset, length);
need_crc = ceph_msg_data_advance(cursor, (size_t)ret);
}
dout("%s %p msg %p done\n", __func__, con, msg);
/* prepare and queue up footer, too */
if (do_datacrc)
msg->footer.data_crc = cpu_to_le32(crc);
else
msg->footer.flags |= CEPH_MSG_FOOTER_NOCRC;
con_out_kvec_reset(con);
prepare_write_message_footer(con);
return 1; /* must return > 0 to indicate success */
}
/*
* write some zeros
*/
static int write_partial_skip(struct ceph_connection *con)
{
int ret;
dout("%s %p %d left\n", __func__, con, con->out_skip);
while (con->out_skip > 0) {
size_t size = min(con->out_skip, (int) PAGE_SIZE);
ret = ceph_tcp_sendpage(con->sock, zero_page, 0, size, true);
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_seq(struct ceph_connection *con)
{
dout("prepare_read_seq %p\n", con);
con->in_base_pos = 0;
con->in_tag = CEPH_MSGR_TAG_SEQ;
}
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;
}
static void prepare_read_keepalive_ack(struct ceph_connection *con)
{
dout("prepare_read_keepalive_ack %p\n", con);
con->in_base_pos = 0;
}
/*
* 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 end, int size, void *object)
{
while (con->in_base_pos < end) {
int left = end - 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 size;
int end;
int ret;
dout("read_partial_banner %p at %d\n", con, con->in_base_pos);
/* peer's banner */
size = strlen(CEPH_BANNER);
end = size;
ret = read_partial(con, end, size, con->in_banner);
if (ret <= 0)
goto out;
size = sizeof (con->actual_peer_addr);
end += size;
ret = read_partial(con, end, size, &con->actual_peer_addr);
if (ret <= 0)
goto out;
size = sizeof (con->peer_addr_for_me);
end += size;
ret = read_partial(con, end, size, &con->peer_addr_for_me);
if (ret <= 0)
goto out;
out:
return ret;
}
static int read_partial_connect(struct ceph_connection *con)
{
int size;
int end;
int ret;
dout("read_partial_connect %p at %d\n", con, con->in_base_pos);
size = sizeof (con->in_reply);
end = size;
ret = read_partial(con, end, size, &con->in_reply);
if (ret <= 0)
goto out;
size = le32_to_cpu(con->in_reply.authorizer_len);
end += size;
ret = read_partial(con, end, size, con->auth_reply_buf);
if (ret <= 0)
goto out;
dout("read_partial_connect %p tag %d, con_seq = %u, g_seq = %u\n",
con, (int)con->in_reply.tag,
le32_to_cpu(con->in_reply.connect_seq),
le32_to_cpu(con->in_reply.global_seq));
out:
return ret;
}
/*
* Verify the hello banner looks okay.
*/
static int verify_hello(struct ceph_connection *con)
{
if (memcmp(con->in_banner, CEPH_BANNER, strlen(CEPH_BANNER))) {
pr_err("connect to %s got bad banner\n",
ceph_pr_addr(&con->peer_addr.in_addr));
con->error_msg = "protocol error, bad banner";
return -1;
}
return 0;
}
static bool addr_is_blank(struct sockaddr_storage *ss)
{
struct in_addr *addr = &((struct sockaddr_in *)ss)->sin_addr;
struct in6_addr *addr6 = &((struct sockaddr_in6 *)ss)->sin6_addr;
switch (ss->ss_family) {
case AF_INET:
return addr->s_addr == htonl(INADDR_ANY);
case AF_INET6:
return ipv6_addr_any(addr6);
default:
return true;
}
}
static int addr_port(struct sockaddr_storage *ss)
{
switch (ss->ss_family) {
case AF_INET:
return ntohs(((struct sockaddr_in *)ss)->sin_port);
case AF_INET6:
return ntohs(((struct sockaddr_in6 *)ss)->sin6_port);
}
return 0;
}
static void addr_set_port(struct sockaddr_storage *ss, int p)
{
switch (ss->ss_family) {
case AF_INET:
((struct sockaddr_in *)ss)->sin_port = htons(p);
break;
case AF_INET6:
((struct sockaddr_in6 *)ss)->sin6_port = htons(p);
break;
}
}
/*
* Unlike other *_pton function semantics, zero indicates success.
*/
static int ceph_pton(const char *str, size_t len, struct sockaddr_storage *ss,
char delim, const char **ipend)
{
struct sockaddr_in *in4 = (struct sockaddr_in *) ss;
struct sockaddr_in6 *in6 = (struct sockaddr_in6 *) ss;
memset(ss, 0, sizeof(*ss));
if (in4_pton(str, len, (u8 *)&in4->sin_addr.s_addr, delim, ipend)) {
ss->ss_family = AF_INET;
return 0;
}
if (in6_pton(str, len, (u8 *)&in6->sin6_addr.s6_addr, delim, ipend)) {
ss->ss_family = AF_INET6;
return 0;
}
return -EINVAL;
}
/*
* Extract hostname string and resolve using kernel DNS facility.
*/
#ifdef CONFIG_CEPH_LIB_USE_DNS_RESOLVER
static int ceph_dns_resolve_name(const char *name, size_t namelen,
struct sockaddr_storage *ss, char delim, const char **ipend)
{
const char *end, *delim_p;
char *colon_p, *ip_addr = NULL;
int ip_len, ret;
/*
* The end of the hostname occurs immediately preceding the delimiter or
* the port marker (':') where the delimiter takes precedence.
*/
delim_p = memchr(name, delim, namelen);
colon_p = memchr(name, ':', namelen);
if (delim_p && colon_p)
end = delim_p < colon_p ? delim_p : colon_p;
else if (!delim_p && colon_p)
end = colon_p;
else {
end = delim_p;
if (!end) /* case: hostname:/ */
end = name + namelen;
}
if (end <= name)
return -EINVAL;
/* do dns_resolve upcall */
ip_len = dns_query(NULL, name, end - name, NULL, &ip_addr, NULL);
if (ip_len > 0)
ret = ceph_pton(ip_addr, ip_len, ss, -1, NULL);
else
ret = -ESRCH;
kfree(ip_addr);
*ipend = end;
pr_info("resolve '%.*s' (ret=%d): %s\n", (int)(end - name), name,
ret, ret ? "failed" : ceph_pr_addr(ss));
return ret;
}
#else
static inline int ceph_dns_resolve_name(const char *name, size_t namelen,
struct sockaddr_storage *ss, char delim, const char **ipend)
{
return -EINVAL;
}
#endif
/*
* Parse a server name (IP or hostname). If a valid IP address is not found
* then try to extract a hostname to resolve using userspace DNS upcall.
*/
static int ceph_parse_server_name(const char *name, size_t namelen,
struct sockaddr_storage *ss, char delim, const char **ipend)
{
int ret;
ret = ceph_pton(name, namelen, ss, delim, ipend);
if (ret)
ret = ceph_dns_resolve_name(name, namelen, ss, delim, ipend);
return ret;
}
/*
* 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, ret = -EINVAL;
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;
int port;
char delim = ',';
if (*p == '[') {
delim = ']';
p++;
}
ret = ceph_parse_server_name(p, end - p, ss, delim, &ipend);
if (ret)
goto bad;
ret = -EINVAL;
p = ipend;
if (delim == ']') {
if (*p != ']') {
dout("missing matching ']'\n");
goto bad;
}
p++;
}
/* port? */
if (p < end && *p == ':') {
port = 0;
p++;
while (p < end && *p >= '0' && *p <= '9') {
port = (port * 10) + (*p - '0');
p++;
}
if (port == 0)
port = CEPH_MON_PORT;
else if (port > 65535)
goto bad;
} else {
port = CEPH_MON_PORT;
}
addr_set_port(ss, port);
dout("parse_ips got %s\n", ceph_pr_addr(ss));
if (p == end)
break;
if (*p != ',')
goto bad;
p++;
}
if (p != end)
goto bad;
if (count)
*count = i + 1;
return 0;
bad:
pr_err("parse_ips bad ip '%.*s'\n", (int)(end - c), c);
return ret;
}
EXPORT_SYMBOL(ceph_parse_ips);
static int process_banner(struct ceph_connection *con)
{
dout("process_banner on %p\n", con);
if (verify_hello(con) < 0)
return -1;
ceph_decode_addr(&con->actual_peer_addr);
ceph_decode_addr(&con->peer_addr_for_me);
/*
* Make sure the other end is who we wanted. note that the other
* end may not yet know their ip address, so if it's 0.0.0.0, give
* them the benefit of the doubt.
*/
if (memcmp(&con->peer_addr, &con->actual_peer_addr,
sizeof(con->peer_addr)) != 0 &&
!(addr_is_blank(&con->actual_peer_addr.in_addr) &&
con->actual_peer_addr.nonce == con->peer_addr.nonce)) {
pr_warn("wrong peer, want %s/%d, got %s/%d\n",
ceph_pr_addr(&con->peer_addr.in_addr),
(int)le32_to_cpu(con->peer_addr.nonce),
ceph_pr_addr(&con->actual_peer_addr.in_addr),
(int)le32_to_cpu(con->actual_peer_addr.nonce));
con->error_msg = "wrong peer at address";
return -1;
}
/*
* did we learn our address?
*/
if (addr_is_blank(&con->msgr->inst.addr.in_addr)) {
int port = addr_port(&con->msgr->inst.addr.in_addr);
memcpy(&con->msgr->inst.addr.in_addr,
&con->peer_addr_for_me.in_addr,
sizeof(con->peer_addr_for_me.in_addr));
addr_set_port(&con->msgr->inst.addr.in_addr, port);
encode_my_addr(con->msgr);
dout("process_banner learned my addr is %s\n",
ceph_pr_addr(&con->msgr->inst.addr.in_addr));
}
return 0;
}
static int process_connect(struct ceph_connection *con)
{
u64 sup_feat = from_msgr(con->msgr)->supported_features;
u64 req_feat = from_msgr(con->msgr)->required_features;
u64 server_feat = ceph_sanitize_features(
le64_to_cpu(con->in_reply.features));
int ret;
dout("process_connect on %p tag %d\n", con, (int)con->in_tag);
if (con->auth_reply_buf) {
/*
* Any connection that defines ->get_authorizer()
* should also define ->verify_authorizer_reply().
* See get_connect_authorizer().
*/
ret = con->ops->verify_authorizer_reply(con);
if (ret < 0) {
con->error_msg = "bad authorize reply";
return ret;
}
}
switch (con->in_reply.tag) {
case CEPH_MSGR_TAG_FEATURES:
pr_err("%s%lld %s feature set mismatch,"
" my %llx < server's %llx, missing %llx\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr.in_addr),
sup_feat, server_feat, server_feat & ~sup_feat);
con->error_msg = "missing required protocol features";
reset_connection(con);
return -1;
case CEPH_MSGR_TAG_BADPROTOVER:
pr_err("%s%lld %s protocol version mismatch,"
" my %d != server's %d\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr.in_addr),
le32_to_cpu(con->out_connect.protocol_version),
le32_to_cpu(con->in_reply.protocol_version));
con->error_msg = "protocol version mismatch";
reset_connection(con);
return -1;
case CEPH_MSGR_TAG_BADAUTHORIZER:
con->auth_retry++;
dout("process_connect %p got BADAUTHORIZER attempt %d\n", con,
con->auth_retry);
if (con->auth_retry == 2) {
con->error_msg = "connect authorization failure";
return -1;
}
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
prepare_read_connect(con);
break;
case CEPH_MSGR_TAG_RESETSESSION:
/*
* If we connected with a large connect_seq but the peer
* has no record of a session with us (no connection, or
* connect_seq == 0), they will send RESETSESION to indicate
* that they must have reset their session, and may have
* dropped messages.
*/
dout("process_connect got RESET peer seq %u\n",
le32_to_cpu(con->in_reply.connect_seq));
pr_err("%s%lld %s connection reset\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr.in_addr));
reset_connection(con);
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
prepare_read_connect(con);
/* Tell ceph about it. */
mutex_unlock(&con->mutex);
pr_info("reset on %s%lld\n", ENTITY_NAME(con->peer_name));
if (con->ops->peer_reset)
con->ops->peer_reset(con);
mutex_lock(&con->mutex);
if (con->state != CON_STATE_NEGOTIATING)
return -EAGAIN;
break;
case CEPH_MSGR_TAG_RETRY_SESSION:
/*
* If we sent a smaller connect_seq than the peer has, try
* again with a larger value.
*/
dout("process_connect got RETRY_SESSION my seq %u, peer %u\n",
le32_to_cpu(con->out_connect.connect_seq),
le32_to_cpu(con->in_reply.connect_seq));
con->connect_seq = le32_to_cpu(con->in_reply.connect_seq);
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
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_reply.global_seq));
get_global_seq(con->msgr,
le32_to_cpu(con->in_reply.global_seq));
con_out_kvec_reset(con);
ret = prepare_write_connect(con);
if (ret < 0)
return ret;
prepare_read_connect(con);
break;
case CEPH_MSGR_TAG_SEQ:
case CEPH_MSGR_TAG_READY:
if (req_feat & ~server_feat) {
pr_err("%s%lld %s protocol feature mismatch,"
" my required %llx > server's %llx, need %llx\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr.in_addr),
req_feat, server_feat, req_feat & ~server_feat);
con->error_msg = "missing required protocol features";
reset_connection(con);
return -1;
}
WARN_ON(con->state != CON_STATE_NEGOTIATING);
con->state = CON_STATE_OPEN;
con->auth_retry = 0; /* we authenticated; clear flag */
con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
con->connect_seq++;
con->peer_features = server_feat;
dout("process_connect got READY gseq %d cseq %d (%d)\n",
con->peer_global_seq,
le32_to_cpu(con->in_reply.connect_seq),
con->connect_seq);
WARN_ON(con->connect_seq !=
le32_to_cpu(con->in_reply.connect_seq));
if (con->in_reply.flags & CEPH_MSG_CONNECT_LOSSY)
con_flag_set(con, CON_FLAG_LOSSYTX);
con->delay = 0; /* reset backoff memory */
if (con->in_reply.tag == CEPH_MSGR_TAG_SEQ) {
prepare_write_seq(con);
prepare_read_seq(con);
} else {
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.
*/
con->error_msg = "protocol error, got WAIT as client";
return -1;
default:
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 size = sizeof (con->in_temp_ack);
int end = size;
return read_partial(con, end, size, &con->in_temp_ack);
}
/*
* We can finally discard anything that's been acked.
*/
static void process_ack(struct ceph_connection *con)
{
struct ceph_msg *m;
u64 ack = le64_to_cpu(con->in_temp_ack);
u64 seq;
while (!list_empty(&con->out_sent)) {
m = list_first_entry(&con->out_sent, struct ceph_msg,
list_head);
seq = le64_to_cpu(m->hdr.seq);
if (seq > ack)
break;
dout("got ack for seq %llu type %d at %p\n", seq,
le16_to_cpu(m->hdr.type), m);
m->ack_stamp = jiffies;
ceph_msg_remove(m);
}
prepare_read_tag(con);
}
static int read_partial_message_section(struct ceph_connection *con,
struct kvec *section,
unsigned int sec_len, u32 *crc)
{
int ret, left;
BUG_ON(!section);
while (section->iov_len < sec_len) {
BUG_ON(section->iov_base == NULL);
left = sec_len - section->iov_len;
ret = ceph_tcp_recvmsg(con->sock, (char *)section->iov_base +
section->iov_len, left);
if (ret <= 0)
return ret;
section->iov_len += ret;
}
if (section->iov_len == sec_len)
*crc = crc32c(0, section->iov_base, section->iov_len);
return 1;
}
static int read_partial_msg_data(struct ceph_connection *con)
{
struct ceph_msg *msg = con->in_msg;
struct ceph_msg_data_cursor *cursor = &msg->cursor;
bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
struct page *page;
size_t page_offset;
size_t length;
u32 crc = 0;
int ret;
BUG_ON(!msg);
if (list_empty(&msg->data))
return -EIO;
if (do_datacrc)
crc = con->in_data_crc;
while (cursor->resid) {
page = ceph_msg_data_next(cursor, &page_offset, &length, NULL);
ret = ceph_tcp_recvpage(con->sock, page, page_offset, length);
if (ret <= 0) {
if (do_datacrc)
con->in_data_crc = crc;
return ret;
}
if (do_datacrc)
crc = ceph_crc32c_page(crc, page, page_offset, ret);
(void) ceph_msg_data_advance(cursor, (size_t)ret);
}
if (do_datacrc)
con->in_data_crc = crc;
return 1; /* must return > 0 to indicate success */
}
/*
* read (part of) a message.
*/
static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip);
static int read_partial_message(struct ceph_connection *con)
{
struct ceph_msg *m = con->in_msg;
int size;
int end;
int ret;
unsigned int front_len, middle_len, data_len;
bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
u64 seq;
u32 crc;
dout("read_partial_message con %p msg %p\n", con, m);
/* header */
size = sizeof (con->in_hdr);
end = size;
ret = read_partial(con, end, size, &con->in_hdr);
if (ret <= 0)
return ret;
crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
if (cpu_to_le32(crc) != 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_MIDDLE_LEN)
return -EIO;
data_len = le32_to_cpu(con->in_hdr.data_len);
if (data_len > CEPH_MSG_MAX_DATA_LEN)
return -EIO;
/* verify seq# */
seq = le64_to_cpu(con->in_hdr.seq);
if ((s64)seq - (s64)con->in_seq < 1) {
pr_info("skipping %s%lld %s seq %lld expected %lld\n",
ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr.in_addr),
seq, con->in_seq + 1);
con->in_base_pos = -front_len - middle_len - data_len -
sizeof_footer(con);
con->in_tag = CEPH_MSGR_TAG_READY;
return 1;
} else if ((s64)seq - (s64)con->in_seq > 1) {
pr_err("read_partial_message bad seq %lld expected %lld\n",
seq, con->in_seq + 1);
con->error_msg = "bad message sequence # for incoming message";
return -EBADE;
}
/* allocate message? */
if (!con->in_msg) {
int skip = 0;
dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
front_len, data_len);
ret = ceph_con_in_msg_alloc(con, &skip);
if (ret < 0)
return ret;
BUG_ON(!con->in_msg ^ skip);
if (skip) {
/* skip this message */
dout("alloc_msg said skip message\n");
con->in_base_pos = -front_len - middle_len - data_len -
sizeof_footer(con);
con->in_tag = CEPH_MSGR_TAG_READY;
con->in_seq++;
return 1;
}
BUG_ON(!con->in_msg);
BUG_ON(con->in_msg->con != con);
m = con->in_msg;
m->front.iov_len = 0; /* haven't read it yet */
if (m->middle)
m->middle->vec.iov_len = 0;
/* prepare for data payload, if any */
if (data_len)
prepare_message_data(con->in_msg, data_len);
}
/* 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 */
if (data_len) {
ret = read_partial_msg_data(con);
if (ret <= 0)
return ret;
}
/* footer */
size = sizeof_footer(con);
end += size;
ret = read_partial(con, end, size, &m->footer);
if (ret <= 0)
return ret;
if (!need_sign) {
m->footer.flags = m->old_footer.flags;
m->footer.sig = 0;
}
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 (do_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;
}
if (need_sign && con->ops->check_message_signature &&
con->ops->check_message_signature(m)) {
pr_err("read_partial_message %p signature check failed\n", m);
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 = con->in_msg;
BUG_ON(con->in_msg->con != con);
con->in_msg = NULL;
/* if first message, set peer_name */
if (con->peer_name.type == 0)
con->peer_name = msg->hdr.src;
con->in_seq++;
mutex_unlock(&con->mutex);
dout("===== %p %llu from %s%lld %d=%s len %d+%d (%u %u %u) =====\n",
msg, le64_to_cpu(msg->hdr.seq),
ENTITY_NAME(msg->hdr.src),
le16_to_cpu(msg->hdr.type),
ceph_msg_type_name(le16_to_cpu(msg->hdr.type)),
le32_to_cpu(msg->hdr.front_len),
le32_to_cpu(msg->hdr.data_len),
con->in_front_crc, con->in_middle_crc, con->in_data_crc);
con->ops->dispatch(con, msg);
mutex_lock(&con->mutex);
}
static int read_keepalive_ack(struct ceph_connection *con)
{
struct ceph_timespec ceph_ts;
size_t size = sizeof(ceph_ts);
int ret = read_partial(con, size, size, &ceph_ts);
if (ret <= 0)
return ret;
ceph_decode_timespec(&con->last_keepalive_ack, &ceph_ts);
prepare_read_tag(con);
return 1;
}
/*
* 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)
{
int ret = 1;
dout("try_write start %p state %lu\n", con, con->state);
more:
dout("try_write out_kvec_bytes %d\n", con->out_kvec_bytes);
/* open the socket first? */
if (con->state == CON_STATE_PREOPEN) {
BUG_ON(con->sock);
con->state = CON_STATE_CONNECTING;
con_out_kvec_reset(con);
prepare_write_banner(con);
prepare_read_banner(con);
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);
ret = ceph_tcp_connect(con);
if (ret < 0) {
con->error_msg = "connect error";
goto out;
}
}
more_kvec:
/* kvec data queued? */
if (con->out_kvec_left) {
ret = write_partial_kvec(con);
if (ret <= 0)
goto out;
}
if (con->out_skip) {
ret = write_partial_skip(con);
if (ret <= 0)
goto out;
}
/* msg pages? */
if (con->out_msg) {
if (con->out_msg_done) {
ceph_msg_put(con->out_msg);
con->out_msg = NULL; /* we're done with this one */
goto do_next;
}
ret = write_partial_message_data(con);
if (ret == 1)
goto more_kvec; /* we need to send the footer, too! */
if (ret == 0)
goto out;
if (ret < 0) {
dout("try_write write_partial_message_data err %d\n",
ret);
goto out;
}
}
do_next:
if (con->state == CON_STATE_OPEN) {
if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) {
prepare_write_keepalive(con);
goto more;
}
/* 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;
}
}
/* Nothing to do! */
con_flag_clear(con, CON_FLAG_WRITE_PENDING);
dout("try_write nothing else to write.\n");
ret = 0;
out:
dout("try_write done on %p ret %d\n", con, ret);
return ret;
}
/*
* Read what we can from the socket.
*/
static int try_read(struct ceph_connection *con)
{
int ret = -1;
more:
dout("try_read start on %p state %lu\n", con, con->state);
if (con->state != CON_STATE_CONNECTING &&
con->state != CON_STATE_NEGOTIATING &&
con->state != CON_STATE_OPEN)
return 0;
BUG_ON(!con->sock);
dout("try_read tag %d in_base_pos %d\n", (int)con->in_tag,
con->in_base_pos);
if (con->state == CON_STATE_CONNECTING) {
dout("try_read connecting\n");
ret = read_partial_banner(con);
if (ret <= 0)
goto out;
ret = process_banner(con);
if (ret < 0)
goto out;
con->state = CON_STATE_NEGOTIATING;
/*
* Received banner is good, exchange connection info.
* Do not reset out_kvec, as sending our banner raced
* with receiving peer banner after connect completed.
*/
ret = prepare_write_connect(con);
if (ret < 0)
goto out;
prepare_read_connect(con);
/* Send connection info before awaiting response */
goto out;
}
if (con->state == CON_STATE_NEGOTIATING) {
dout("try_read negotiating\n");
ret = read_partial_connect(con);
if (ret <= 0)
goto out;
ret = process_connect(con);
if (ret < 0)
goto out;
goto more;
}
WARN_ON(con->state != CON_STATE_OPEN);
if (con->in_base_pos < 0) {
/*
* skipping + discarding content.
*
* FIXME: there must be a better way to do this!
*/
static char buf[SKIP_BUF_SIZE];
int skip = min((int) sizeof (buf), -con->in_base_pos);
dout("skipping %d / %d bytes\n", skip, -con->in_base_pos);
ret = ceph_tcp_recvmsg(con->sock, buf, skip);
if (ret <= 0)
goto out;
con->in_base_pos += ret;
if (con->in_base_pos)
goto more;
}
if (con->in_tag == CEPH_MSGR_TAG_READY) {
/*
* what's next?
*/
ret = ceph_tcp_recvmsg(con->sock, &con->in_tag, 1);
if (ret <= 0)
goto out;
dout("try_read got tag %d\n", (int)con->in_tag);
switch (con->in_tag) {
case CEPH_MSGR_TAG_MSG:
prepare_read_message(con);
break;
case CEPH_MSGR_TAG_ACK:
prepare_read_ack(con);
break;
case CEPH_MSGR_TAG_KEEPALIVE2_ACK:
prepare_read_keepalive_ack(con);
break;
case CEPH_MSGR_TAG_CLOSE:
con_close_socket(con);
con->state = CON_STATE_CLOSED;
goto out;
default:
goto bad_tag;
}
}
if (con->in_tag == CEPH_MSGR_TAG_MSG) {
ret = read_partial_message(con);
if (ret <= 0) {
switch (ret) {
case -EBADMSG:
con->error_msg = "bad crc/signature";
/* fall through */
case -EBADE:
ret = -EIO;
break;
case -EIO:
con->error_msg = "io error";
break;
}
goto out;
}
if (con->in_tag == CEPH_MSGR_TAG_READY)
goto more;
process_message(con);
if (con->state == CON_STATE_OPEN)
prepare_read_tag(con);
goto more;
}
if (con->in_tag == CEPH_MSGR_TAG_ACK ||
con->in_tag == CEPH_MSGR_TAG_SEQ) {
/*
* the final handshake seq exchange is semantically
* equivalent to an ACK
*/
ret = read_partial_ack(con);
if (ret <= 0)
goto out;
process_ack(con);
goto more;
}
if (con->in_tag == CEPH_MSGR_TAG_KEEPALIVE2_ACK) {
ret = read_keepalive_ack(con);
if (ret <= 0)
goto out;
goto more;
}
out:
dout("try_read done on %p ret %d\n", con, ret);
return ret;
bad_tag:
pr_err("try_read bad con->in_tag = %d\n", (int)con->in_tag);
con->error_msg = "protocol error, garbage tag";
ret = -1;
goto out;
}
/*
* Atomically queue work on a connection after the specified delay.
* Bump @con reference to avoid races with connection teardown.
* Returns 0 if work was queued, or an error code otherwise.
*/
static int queue_con_delay(struct ceph_connection *con, unsigned long delay)
{
if (!con->ops->get(con)) {
dout("%s %p ref count 0\n", __func__, con);
return -ENOENT;
}
if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) {
dout("%s %p - already queued\n", __func__, con);
con->ops->put(con);
return -EBUSY;
}
dout("%s %p %lu\n", __func__, con, delay);
return 0;
}
static void queue_con(struct ceph_connection *con)
{
(void) queue_con_delay(con, 0);
}
static void cancel_con(struct ceph_connection *con)
{
if (cancel_delayed_work(&con->work)) {
dout("%s %p\n", __func__, con);
con->ops->put(con);
}
}
static bool con_sock_closed(struct ceph_connection *con)
{
if (!con_flag_test_and_clear(con, CON_FLAG_SOCK_CLOSED))
return false;
#define CASE(x) \
case CON_STATE_ ## x: \
con->error_msg = "socket closed (con state " #x ")"; \
break;
switch (con->state) {
CASE(CLOSED);
CASE(PREOPEN);
CASE(CONNECTING);
CASE(NEGOTIATING);
CASE(OPEN);
CASE(STANDBY);
default:
pr_warn("%s con %p unrecognized state %lu\n",
__func__, con, con->state);
con->error_msg = "unrecognized con state";
BUG();
break;
}
#undef CASE
return true;
}
static bool con_backoff(struct ceph_connection *con)
{
int ret;
if (!con_flag_test_and_clear(con, CON_FLAG_BACKOFF))
return false;
ret = queue_con_delay(con, round_jiffies_relative(con->delay));
if (ret) {
dout("%s: con %p FAILED to back off %lu\n", __func__,
con, con->delay);
BUG_ON(ret == -ENOENT);
con_flag_set(con, CON_FLAG_BACKOFF);
}
return true;
}
/* Finish fault handling; con->mutex must *not* be held here */
static void con_fault_finish(struct ceph_connection *con)
{
dout("%s %p\n", __func__, con);
/*
* in case we faulted due to authentication, invalidate our
* current tickets so that we can get new ones.
*/
if (con->auth_retry) {
dout("auth_retry %d, invalidating\n", con->auth_retry);
if (con->ops->invalidate_authorizer)
con->ops->invalidate_authorizer(con);
con->auth_retry = 0;
}
if (con->ops->fault)
con->ops->fault(con);
}
/*
* Do some work on a connection. Drop a connection ref when we're done.
*/
static void ceph_con_workfn(struct work_struct *work)
{
struct ceph_connection *con = container_of(work, struct ceph_connection,
work.work);
bool fault;
mutex_lock(&con->mutex);
while (true) {
int ret;
if ((fault = con_sock_closed(con))) {
dout("%s: con %p SOCK_CLOSED\n", __func__, con);
break;
}
if (con_backoff(con)) {
dout("%s: con %p BACKOFF\n", __func__, con);
break;
}
if (con->state == CON_STATE_STANDBY) {
dout("%s: con %p STANDBY\n", __func__, con);
break;
}
if (con->state == CON_STATE_CLOSED) {
dout("%s: con %p CLOSED\n", __func__, con);
BUG_ON(con->sock);
break;
}
if (con->state == CON_STATE_PREOPEN) {
dout("%s: con %p PREOPEN\n", __func__, con);
BUG_ON(con->sock);
}
ret = try_read(con);
if (ret < 0) {
if (ret == -EAGAIN)
continue;
if (!con->error_msg)
con->error_msg = "socket error on read";
fault = true;
break;
}
ret = try_write(con);
if (ret < 0) {
if (ret == -EAGAIN)
continue;
if (!con->error_msg)
con->error_msg = "socket error on write";
fault = true;
}
break; /* If we make it to here, we're done */
}
if (fault)
con_fault(con);
mutex_unlock(&con->mutex);
if (fault)
con_fault_finish(con);
con->ops->put(con);
}
/*
* Generic error/fault handler. A retry mechanism is used with
* exponential backoff
*/
static void con_fault(struct ceph_connection *con)
{
dout("fault %p state %lu to peer %s\n",
con, con->state, ceph_pr_addr(&con->peer_addr.in_addr));
pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name),
ceph_pr_addr(&con->peer_addr.in_addr), con->error_msg);
con->error_msg = NULL;
WARN_ON(con->state != CON_STATE_CONNECTING &&
con->state != CON_STATE_NEGOTIATING &&
con->state != CON_STATE_OPEN);
con_close_socket(con);
if (con_flag_test(con, CON_FLAG_LOSSYTX)) {
dout("fault on LOSSYTX channel, marking CLOSED\n");
con->state = CON_STATE_CLOSED;
return;
}
if (con->in_msg) {
BUG_ON(con->in_msg->con != con);
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 queued or keepalive pending, place
* the connection in a STANDBY state */
if (list_empty(&con->out_queue) &&
!con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING)) {
dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
con_flag_clear(con, CON_FLAG_WRITE_PENDING);
con->state = CON_STATE_STANDBY;
} else {
/* retry after a delay. */
con->state = CON_STATE_PREOPEN;
if (con->delay == 0)
con->delay = BASE_DELAY_INTERVAL;
else if (con->delay < MAX_DELAY_INTERVAL)
con->delay *= 2;
con_flag_set(con, CON_FLAG_BACKOFF);
queue_con(con);
}
}
/*
* initialize a new messenger instance
*/
void ceph_messenger_init(struct ceph_messenger *msgr,
struct ceph_entity_addr *myaddr)
{
spin_lock_init(&msgr->global_seq_lock);
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);
atomic_set(&msgr->stopping, 0);
write_pnet(&msgr->net, get_net(current->nsproxy->net_ns));
dout("%s %p\n", __func__, msgr);
}
EXPORT_SYMBOL(ceph_messenger_init);
void ceph_messenger_fini(struct ceph_messenger *msgr)
{
put_net(read_pnet(&msgr->net));
}
EXPORT_SYMBOL(ceph_messenger_fini);
static void msg_con_set(struct ceph_msg *msg, struct ceph_connection *con)
{
if (msg->con)
msg->con->ops->put(msg->con);
msg->con = con ? con->ops->get(con) : NULL;
BUG_ON(msg->con != con);
}
static void clear_standby(struct ceph_connection *con)
{
/* come back from STANDBY? */
if (con->state == CON_STATE_STANDBY) {
dout("clear_standby %p and ++connect_seq\n", con);
con->state = CON_STATE_PREOPEN;
con->connect_seq++;
WARN_ON(con_flag_test(con, CON_FLAG_WRITE_PENDING));
WARN_ON(con_flag_test(con, CON_FLAG_KEEPALIVE_PENDING));
}
}
/*
* Queue up an outgoing message on the given connection.
*/
void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
{
/* set src+dst */
msg->hdr.src = con->msgr->inst.name;
BUG_ON(msg->front.iov_len != le32_to_cpu(msg->hdr.front_len));
msg->needs_out_seq = true;
mutex_lock(&con->mutex);
if (con->state == CON_STATE_CLOSED) {
dout("con_send %p closed, dropping %p\n", con, msg);
ceph_msg_put(msg);
mutex_unlock(&con->mutex);
return;
}
msg_con_set(msg, con);
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));
clear_standby(con);
mutex_unlock(&con->mutex);
/* if there wasn't anything waiting to send before, queue
* new work */
if (con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
queue_con(con);
}
EXPORT_SYMBOL(ceph_con_send);
/*
* Revoke a message that was previously queued for send
*/
void ceph_msg_revoke(struct ceph_msg *msg)
{
struct ceph_connection *con = msg->con;
if (!con) {
dout("%s msg %p null con\n", __func__, msg);
return; /* Message not in our possession */
}
mutex_lock(&con->mutex);
if (!list_empty(&msg->list_head)) {
dout("%s %p msg %p - was on queue\n", __func__, con, msg);
list_del_init(&msg->list_head);
msg->hdr.seq = 0;
ceph_msg_put(msg);
}
if (con->out_msg == msg) {
BUG_ON(con->out_skip);
/* footer */
if (con->out_msg_done) {
con->out_skip += con_out_kvec_skip(con);
} else {
BUG_ON(!msg->data_length);
con->out_skip += sizeof_footer(con);
}
/* data, middle, front */
if (msg->data_length)
con->out_skip += msg->cursor.total_resid;
if (msg->middle)
con->out_skip += con_out_kvec_skip(con);
con->out_skip += con_out_kvec_skip(con);
dout("%s %p msg %p - was sending, will write %d skip %d\n",
__func__, con, msg, con->out_kvec_bytes, con->out_skip);
msg->hdr.seq = 0;
con->out_msg = NULL;
ceph_msg_put(msg);
}
mutex_unlock(&con->mutex);
}
/*
* Revoke a message that we may be reading data into
*/
void ceph_msg_revoke_incoming(struct ceph_msg *msg)
{
struct ceph_connection *con = msg->con;
if (!con) {
dout("%s msg %p null con\n", __func__, msg);
return; /* Message not in our possession */
}
mutex_lock(&con->mutex);
if (con->in_msg == msg) {
unsigned int front_len = le32_to_cpu(con->in_hdr.front_len);
unsigned int middle_len = le32_to_cpu(con->in_hdr.middle_len);
unsigned int data_len = le32_to_cpu(con->in_hdr.data_len);
/* skip rest of message */
dout("%s %p msg %p revoked\n", __func__, con, msg);
con->in_base_pos = con->in_base_pos -
sizeof(struct ceph_msg_header) -
front_len -
middle_len -
data_len -
sizeof(struct ceph_msg_footer);
ceph_msg_put(con->in_msg);
con->in_msg = NULL;
con->in_tag = CEPH_MSGR_TAG_READY;
con->in_seq++;
} else {
dout("%s %p in_msg %p msg %p no-op\n",
__func__, 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)
{
dout("con_keepalive %p\n", con);
mutex_lock(&con->mutex);
clear_standby(con);
mutex_unlock(&con->mutex);
if (con_flag_test_and_set(con, CON_FLAG_KEEPALIVE_PENDING) == 0 &&
con_flag_test_and_set(con, CON_FLAG_WRITE_PENDING) == 0)
queue_con(con);
}
EXPORT_SYMBOL(ceph_con_keepalive);
bool ceph_con_keepalive_expired(struct ceph_connection *con,
unsigned long interval)
{
if (interval > 0 &&
(con->peer_features & CEPH_FEATURE_MSGR_KEEPALIVE2)) {
struct timespec now = CURRENT_TIME;
struct timespec ts;
jiffies_to_timespec(interval, &ts);
ts = timespec_add(con->last_keepalive_ack, ts);
return timespec_compare(&now, &ts) >= 0;
}
return false;
}
static struct ceph_msg_data *ceph_msg_data_create(enum ceph_msg_data_type type)
{
struct ceph_msg_data *data;
if (WARN_ON(!ceph_msg_data_type_valid(type)))
return NULL;
data = kmem_cache_zalloc(ceph_msg_data_cache, GFP_NOFS);
if (data)
data->type = type;
INIT_LIST_HEAD(&data->links);
return data;
}
static void ceph_msg_data_destroy(struct ceph_msg_data *data)
{
if (!data)
return;
WARN_ON(!list_empty(&data->links));
if (data->type == CEPH_MSG_DATA_PAGELIST)
ceph_pagelist_release(data->pagelist);
kmem_cache_free(ceph_msg_data_cache, data);
}
void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
size_t length, size_t alignment)
{
struct ceph_msg_data *data;
BUG_ON(!pages);
BUG_ON(!length);
data = ceph_msg_data_create(CEPH_MSG_DATA_PAGES);
BUG_ON(!data);
data->pages = pages;
data->length = length;
data->alignment = alignment & ~PAGE_MASK;
list_add_tail(&data->links, &msg->data);
msg->data_length += length;
}
EXPORT_SYMBOL(ceph_msg_data_add_pages);
void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
struct ceph_pagelist *pagelist)
{
struct ceph_msg_data *data;
BUG_ON(!pagelist);
BUG_ON(!pagelist->length);
data = ceph_msg_data_create(CEPH_MSG_DATA_PAGELIST);
BUG_ON(!data);
data->pagelist = pagelist;
list_add_tail(&data->links, &msg->data);
msg->data_length += pagelist->length;
}
EXPORT_SYMBOL(ceph_msg_data_add_pagelist);
#ifdef CONFIG_BLOCK
void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
size_t length)
{
struct ceph_msg_data *data;
BUG_ON(!bio);
data = ceph_msg_data_create(CEPH_MSG_DATA_BIO);
BUG_ON(!data);
data->bio = bio;
data->bio_length = length;
list_add_tail(&data->links, &msg->data);
msg->data_length += length;
}
EXPORT_SYMBOL(ceph_msg_data_add_bio);
#endif /* CONFIG_BLOCK */
/*
* construct a new message with given type, size
* the new msg has a ref count of 1.
*/
struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
bool can_fail)
{
struct ceph_msg *m;
m = kmem_cache_zalloc(ceph_msg_cache, flags);
if (m == NULL)
goto out;
m->hdr.type = cpu_to_le16(type);
m->hdr.priority = cpu_to_le16(CEPH_MSG_PRIO_DEFAULT);
m->hdr.front_len = cpu_to_le32(front_len);
INIT_LIST_HEAD(&m->list_head);
kref_init(&m->kref);
INIT_LIST_HEAD(&m->data);
/* front */
if (front_len) {
m->front.iov_base = ceph_kvmalloc(front_len, flags);
if (m->front.iov_base == NULL) {
dout("ceph_msg_new can't allocate %d bytes\n",
front_len);
goto out2;
}
} else {
m->front.iov_base = NULL;
}
m->front_alloc_len = m->front.iov_len = front_len;
dout("ceph_msg_new %p front %d\n", m, front_len);
return m;
out2:
ceph_msg_put(m);
out:
if (!can_fail) {
pr_err("msg_new can't create type %d front %d\n", type,
front_len);
WARN_ON(1);
} else {
dout("msg_new can't create type %d front %d\n", type,
front_len);
}
return NULL;
}
EXPORT_SYMBOL(ceph_msg_new);
/*
* 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;
}
/*
* Allocate a message for receiving an incoming message on a
* connection, and save the result in con->in_msg. Uses the
* connection's private alloc_msg op if available.
*
* Returns 0 on success, or a negative error code.
*
* On success, if we set *skip = 1:
* - the next message should be skipped and ignored.
* - con->in_msg == NULL
* or if we set *skip = 0:
* - con->in_msg is non-null.
* On error (ENOMEM, EAGAIN, ...),
* - con->in_msg == NULL
*/
static int ceph_con_in_msg_alloc(struct ceph_connection *con, int *skip)
{
struct ceph_msg_header *hdr = &con->in_hdr;
int middle_len = le32_to_cpu(hdr->middle_len);
struct ceph_msg *msg;
int ret = 0;
BUG_ON(con->in_msg != NULL);
BUG_ON(!con->ops->alloc_msg);
mutex_unlock(&con->mutex);
msg = con->ops->alloc_msg(con, hdr, skip);
mutex_lock(&con->mutex);
if (con->state != CON_STATE_OPEN) {
if (msg)
ceph_msg_put(msg);
return -EAGAIN;
}
if (msg) {
BUG_ON(*skip);
msg_con_set(msg, con);
con->in_msg = msg;
} else {
/*
* Null message pointer means either we should skip
* this message or we couldn't allocate memory. The
* former is not an error.
*/
if (*skip)
return 0;
con->error_msg = "error allocating memory for incoming message";
return -ENOMEM;
}
memcpy(&con->in_msg->hdr, &con->in_hdr, sizeof(con->in_hdr));
if (middle_len && !con->in_msg->middle) {
ret = ceph_alloc_middle(con, con->in_msg);
if (ret < 0) {
ceph_msg_put(con->in_msg);
con->in_msg = NULL;
}
}
return ret;
}
/*
* Free a generically kmalloc'd message.
*/
static void ceph_msg_free(struct ceph_msg *m)
{
dout("%s %p\n", __func__, m);
kvfree(m->front.iov_base);
kmem_cache_free(ceph_msg_cache, m);
}
static void ceph_msg_release(struct kref *kref)
{
struct ceph_msg *m = container_of(kref, struct ceph_msg, kref);
struct ceph_msg_data *data, *next;
dout("%s %p\n", __func__, m);
WARN_ON(!list_empty(&m->list_head));
msg_con_set(m, NULL);
/* drop middle, data, if any */
if (m->middle) {
ceph_buffer_put(m->middle);
m->middle = NULL;
}
list_for_each_entry_safe(data, next, &m->data, links) {
list_del_init(&data->links);
ceph_msg_data_destroy(data);
}
m->data_length = 0;
if (m->pool)
ceph_msgpool_put(m->pool, m);
else
ceph_msg_free(m);
}
struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
{
dout("%s %p (was %d)\n", __func__, msg,
kref_read(&msg->kref));
kref_get(&msg->kref);
return msg;
}
EXPORT_SYMBOL(ceph_msg_get);
void ceph_msg_put(struct ceph_msg *msg)
{
dout("%s %p (was %d)\n", __func__, msg,
kref_read(&msg->kref));
kref_put(&msg->kref, ceph_msg_release);
}
EXPORT_SYMBOL(ceph_msg_put);
void ceph_msg_dump(struct ceph_msg *msg)
{
pr_debug("msg_dump %p (front_alloc_len %d length %zd)\n", msg,
msg->front_alloc_len, msg->data_length);
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);
}
EXPORT_SYMBOL(ceph_msg_dump);
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