diff options
Diffstat (limited to 'net/ceph/messenger.c')
| -rw-r--r-- | net/ceph/messenger.c | 3395 |
1 files changed, 3395 insertions, 0 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c new file mode 100644 index 000000000..967080a9f --- /dev/null +++ b/net/ceph/messenger.c @@ -0,0 +1,3395 @@ +#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/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> + +#define list_entry_next(pos, member) \ + list_entry(pos->member.next, typeof(*pos), member) + +/* + * 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; + +#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 con_work(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_create("ceph_msg", + sizeof (struct ceph_msg), + __alignof__(struct ceph_msg), 0, NULL); + + if (!ceph_msg_cache) + return -ENOMEM; + + BUG_ON(ceph_msg_data_cache); + ceph_msg_data_cache = kmem_cache_create("ceph_msg_data", + sizeof (struct ceph_msg_data), + __alignof__(struct ceph_msg_data), + 0, NULL); + 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; + } + + ceph_msgr_slab_exit(); + + BUG_ON(zero_page == NULL); + kunmap(zero_page); + page_cache_release(zero_page); + zero_page = NULL; +} + +int ceph_msgr_init(void) +{ + BUG_ON(zero_page != NULL); + zero_page = ZERO_PAGE(0); + page_cache_get(zero_page); + + if (ceph_msgr_slab_init()) + return -ENOMEM; + + /* + * 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(con->peer_addr.in_addr.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 (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); + BUG_ON(msg->con == NULL); + msg->con->ops->put(msg->con); + msg->con = NULL; + + 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); + con->in_msg->con = NULL; + ceph_msg_put(con->in_msg); + con->in_msg = NULL; + con->ops->put(con); + } + + con->connect_seq = 0; + con->out_seq = 0; + if (con->out_msg) { + ceph_msg_put(con->out_msg); + con->out_msg = NULL; + } + con->in_seq = 0; + con->in_seq_acked = 0; +} + +/* + * mark a peer down. drop any open connections. + */ +void ceph_con_close(struct ceph_connection *con) +{ + 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, con_work); + + 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) +{ + 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; + + index = con->out_kvec_left; + 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; +} + +#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_entry_next(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_entry_next(cursor->data, links); + __ceph_msg_data_cursor_init(cursor); + new_piece = true; + } + cursor->need_crc = new_piece; + + return new_piece; +} + +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; + int v = con->out_kvec_left; + + m->footer.flags |= CEPH_MSG_FOOTER_COMPLETE; + + dout("prepare_write_message_footer %p\n", con); + con->out_kvec_is_msg = true; + con->out_kvec[v].iov_base = &m->footer; + if (con->peer_features & CEPH_FEATURE_MSG_AUTH) { + if (con->ops->sign_message) + con->ops->sign_message(con, m); + else + m->footer.sig = 0; + con->out_kvec[v].iov_len = sizeof(m->footer); + con->out_kvec_bytes += sizeof(m->footer); + } else { + m->old_footer.flags = m->footer.flags; + con->out_kvec[v].iov_len = sizeof(m->old_footer); + con->out_kvec_bytes += sizeof(m->old_footer); + } + con->out_kvec_left++; + con->out_more = m->more_to_follow; + con->out_msg_done = true; +} + +/* + * Prepare headers for the next outgoing message. + */ +static void prepare_write_message(struct ceph_connection *con) +{ + struct ceph_msg *m; + u32 crc; + + con_out_kvec_reset(con); + con->out_kvec_is_msg = true; + con->out_msg_done = false; + + /* Sneak an ack in there first? If we can get it into the same + * TCP packet that's a good thing. */ + if (con->in_seq > con->in_seq_acked) { + con->in_seq_acked = con->in_seq; + con_out_kvec_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 (m->hdr), &m->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 crc (except data pages), footer */ + crc = crc32c(0, &m->hdr, offsetof(struct ceph_msg_header, crc)); + con->out_msg->hdr.crc = cpu_to_le32(crc); + con->out_msg->footer.flags = 0; + + 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)); + + /* 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); + 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; + } + + /* Can't hold the mutex while getting authorizer */ + mutex_unlock(&con->mutex); + auth = con->ops->get_authorizer(con, auth_proto, con->auth_retry); + mutex_lock(&con->mutex); + + if (IS_ERR(auth)) + return auth; + if (con->state != CON_STATE_NEGOTIATING) + return ERR_PTR(-EAGAIN); + + 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(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; + con->out_kvec_is_msg = false; + ret = 1; +out: + dout("write_partial_kvec %p %d left in %d kvecs ret = %d\n", con, + con->out_kvec_bytes, con->out_kvec_left, ret); + return ret; /* done! */ +} + +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 = !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(&msg->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(&msg->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; + + while (con->out_skip > 0) { + size_t size = min(con->out_skip, (int) PAGE_CACHE_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; +} + +/* + * 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) +{ + switch (ss->ss_family) { + case AF_INET: + return ((struct sockaddr_in *)ss)->sin_addr.s_addr == 0; + case AF_INET6: + return + ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[0] == 0 && + ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[1] == 0 && + ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[2] == 0 && + ((struct sockaddr_in6 *)ss)->sin6_addr.s6_addr32[3] == 0; + } + return false; +} + +static int addr_port(struct sockaddr_storage *ss) +{ + switch (ss->ss_family) { + case AF_INET: + return ntohs(((struct sockaddr_in *)ss)->sin_port); + case AF_INET6: + return ntohs(((struct sockaddr_in6 *)ss)->sin6_port); + } + return 0; +} + +static void addr_set_port(struct sockaddr_storage *ss, int p) +{ + switch (ss->ss_family) { + case AF_INET: + ((struct sockaddr_in *)ss)->sin_port = htons(p); + 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 = con->msgr->supported_features; + u64 req_feat = 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); + + 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; + const bool do_datacrc = !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(&msg->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(&msg->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 = !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(m->footer); + con->in_tag = CEPH_MSGR_TAG_READY; + return 0; + } else if ((s64)seq - (s64)con->in_seq > 1) { + pr_err("read_partial_message bad seq %lld expected %lld\n", + seq, con->in_seq + 1); + con->error_msg = "bad message sequence # for incoming message"; + return -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 (con->in_msg && data_len > con->in_msg->data_length) { + pr_warn("%s skipping long message (%u > %zd)\n", + __func__, data_len, con->in_msg->data_length); + ceph_msg_put(con->in_msg); + con->in_msg = NULL; + skip = 1; + } + if (skip) { + /* skip this message */ + dout("alloc_msg said skip message\n"); + con->in_base_pos = -front_len - middle_len - data_len - + sizeof(m->footer); + con->in_tag = CEPH_MSGR_TAG_READY; + con->in_seq++; + return 0; + } + + 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 */ + if (need_sign) + size = sizeof(m->footer); + else + size = sizeof(m->old_footer); + + 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(con, 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; + + BUG_ON(con->in_msg->con != con); + con->in_msg->con = NULL; + msg = con->in_msg; + con->in_msg = NULL; + con->ops->put(con); + + /* 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); +} + + +/* + * 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_skip) { + ret = write_partial_skip(con); + if (ret <= 0) + goto out; + } + if (con->out_kvec_left) { + ret = write_partial_kvec(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) { + /* is anything else pending? */ + if (!list_empty(&con->out_queue)) { + prepare_write_message(con); + goto more; + } + if (con->in_seq > con->in_seq_acked) { + prepare_write_ack(con); + goto more; + } + if (con_flag_test_and_clear(con, CON_FLAG_KEEPALIVE_PENDING)) { + prepare_write_keepalive(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_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"; + /* 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; + } + +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) +{ + /* + * in case we faulted due to authentication, invalidate our + * current tickets so that we can get new ones. + */ + if (con->auth_retry && con->ops->invalidate_authorizer) { + dout("calling invalidate_authorizer()\n"); + con->ops->invalidate_authorizer(con); + } + + if (con->ops->fault) + con->ops->fault(con); +} + +/* + * Do some work on a connection. Drop a connection ref when we're done. + */ +static void con_work(struct work_struct *work) +{ + struct ceph_connection *con = container_of(work, struct ceph_connection, + work.work); + 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); + con->in_msg->con = NULL; + ceph_msg_put(con->in_msg); + con->in_msg = NULL; + con->ops->put(con); + } + + /* 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, + u64 supported_features, + u64 required_features, + bool nocrc, + bool tcp_nodelay) +{ + msgr->supported_features = supported_features; + msgr->required_features = required_features; + + 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); + msgr->nocrc = nocrc; + msgr->tcp_nodelay = tcp_nodelay; + + atomic_set(&msgr->stopping, 0); + + dout("%s %p\n", __func__, msgr); +} +EXPORT_SYMBOL(ceph_messenger_init); + +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; + } + + BUG_ON(msg->con != NULL); + msg->con = con->ops->get(con); + BUG_ON(msg->con == NULL); + + 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) + 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); + BUG_ON(msg->con == NULL); + msg->con->ops->put(msg->con); + msg->con = NULL; + msg->hdr.seq = 0; + + ceph_msg_put(msg); + } + if (con->out_msg == msg) { + dout("%s %p msg %p - was sending\n", __func__, con, msg); + con->out_msg = NULL; + if (con->out_kvec_is_msg) { + con->out_skip = con->out_kvec_bytes; + con->out_kvec_is_msg = false; + } + msg->hdr.seq = 0; + + 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; + + BUG_ON(msg == NULL); + if (!msg->con) { + dout("%s msg %p null con\n", __func__, msg); + + return; /* Message not in our possession */ + } + + con = msg->con; + 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); + +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); + con->in_msg = msg; + con->in_msg->con = con->ops->get(con); + BUG_ON(con->in_msg->con == NULL); + } 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); + LIST_HEAD(data); + struct list_head *links; + struct list_head *next; + + dout("%s %p\n", __func__, m); + WARN_ON(!list_empty(&m->list_head)); + + /* drop middle, data, if any */ + if (m->middle) { + ceph_buffer_put(m->middle); + m->middle = NULL; + } + + list_splice_init(&m->data, &data); + list_for_each_safe(links, next, &data) { + struct ceph_msg_data *data; + + data = list_entry(links, struct ceph_msg_data, links); + list_del_init(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, + atomic_read(&msg->kref.refcount)); + 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, + atomic_read(&msg->kref.refcount)); + 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); |