diff options
Diffstat (limited to 'net/ceph/messenger.c')
| -rw-r--r-- | net/ceph/messenger.c | 2135 |
1 files changed, 2135 insertions, 0 deletions
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c new file mode 100644 index 000000000..b9b64a242 --- /dev/null +++ b/net/ceph/messenger.c @@ -0,0 +1,2135 @@ +// SPDX-License-Identifier: GPL-2.0 +#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/sched/mm.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 */ + +static bool con_flag_valid(unsigned long con_flag) +{ + switch (con_flag) { + case CEPH_CON_F_LOSSYTX: + case CEPH_CON_F_KEEPALIVE_PENDING: + case CEPH_CON_F_WRITE_PENDING: + case CEPH_CON_F_SOCK_CLOSED: + case CEPH_CON_F_BACKOFF: + return true; + default: + return false; + } +} + +void ceph_con_flag_clear(struct ceph_connection *con, unsigned long con_flag) +{ + BUG_ON(!con_flag_valid(con_flag)); + + clear_bit(con_flag, &con->flags); +} + +void ceph_con_flag_set(struct ceph_connection *con, unsigned long con_flag) +{ + BUG_ON(!con_flag_valid(con_flag)); + + set_bit(con_flag, &con->flags); +} + +bool ceph_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); +} + +bool ceph_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); +} + +bool ceph_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; + +#ifdef CONFIG_LOCKDEP +static struct lock_class_key socket_class; +#endif + +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); + +struct page *ceph_zero_page; /* used in certain error cases */ + +const char *ceph_pr_addr(const struct ceph_entity_addr *addr) +{ + int i; + char *s; + struct sockaddr_storage ss = addr->in_addr; /* align */ + 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, "(%d)%pI4:%hu", + le32_to_cpu(addr->type), &in4->sin_addr, + ntohs(in4->sin_port)); + break; + + case AF_INET6: + snprintf(s, MAX_ADDR_STR_LEN, "(%d)[%pI6c]:%hu", + le32_to_cpu(addr->type), &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); + +void ceph_encode_my_addr(struct ceph_messenger *msgr) +{ + if (!ceph_msgr2(from_msgr(msgr))) { + memcpy(&msgr->my_enc_addr, &msgr->inst.addr, + sizeof(msgr->my_enc_addr)); + ceph_encode_banner_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; + + return 0; +} + +static void ceph_msgr_slab_exit(void) +{ + 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(!ceph_zero_page); + put_page(ceph_zero_page); + ceph_zero_page = NULL; + + ceph_msgr_slab_exit(); +} + +int __init ceph_msgr_init(void) +{ + if (ceph_msgr_slab_init()) + return -ENOMEM; + + BUG_ON(ceph_zero_page); + ceph_zero_page = ZERO_PAGE(0); + get_page(ceph_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; +} + +void ceph_msgr_exit(void) +{ + BUG_ON(ceph_msgr_wq == NULL); + + _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 %p state = %d, 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 (ceph_con_flag_test(con, CEPH_CON_F_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 = %d sk_state = %u\n", __func__, + con, con->state, sk->sk_state); + + switch (sk->sk_state) { + case TCP_CLOSE: + dout("%s TCP_CLOSE\n", __func__); + fallthrough; + case TCP_CLOSE_WAIT: + dout("%s TCP_CLOSE_WAIT\n", __func__); + con_sock_state_closing(con); + ceph_con_flag_set(con, CEPH_CON_F_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. + */ +int ceph_tcp_connect(struct ceph_connection *con) +{ + struct sockaddr_storage ss = con->peer_addr.in_addr; /* align */ + struct socket *sock; + unsigned int noio_flag; + int ret; + + dout("%s con %p peer_addr %s\n", __func__, con, + ceph_pr_addr(&con->peer_addr)); + BUG_ON(con->sock); + + /* sock_create_kern() allocates with GFP_KERNEL */ + noio_flag = memalloc_noio_save(); + ret = sock_create_kern(read_pnet(&con->msgr->net), ss.ss_family, + SOCK_STREAM, IPPROTO_TCP, &sock); + memalloc_noio_restore(noio_flag); + 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); + + con_sock_state_connecting(con); + ret = kernel_connect(sock, (struct sockaddr *)&ss, sizeof(ss), + O_NONBLOCK); + if (ret == -EINPROGRESS) { + dout("connect %s EINPROGRESS sk_state = %u\n", + ceph_pr_addr(&con->peer_addr), + sock->sk->sk_state); + } else if (ret < 0) { + pr_err("connect %s error %d\n", + ceph_pr_addr(&con->peer_addr), ret); + sock_release(sock); + return ret; + } + + if (ceph_test_opt(from_msgr(con->msgr), TCP_NODELAY)) + tcp_sock_set_nodelay(sock->sk); + + con->sock = sock; + return 0; +} + +/* + * Shutdown/close the socket for the given connection. + */ +int ceph_con_close_socket(struct ceph_connection *con) +{ + int rc = 0; + + dout("%s con %p sock %p\n", __func__, 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. + */ + ceph_con_flag_clear(con, CEPH_CON_F_SOCK_CLOSED); + + con_sock_state_closed(con); + return rc; +} + +static void ceph_con_reset_protocol(struct ceph_connection *con) +{ + dout("%s con %p\n", __func__, con); + + ceph_con_close_socket(con); + if (con->in_msg) { + WARN_ON(con->in_msg->con != con); + ceph_msg_put(con->in_msg); + con->in_msg = NULL; + } + if (con->out_msg) { + WARN_ON(con->out_msg->con != con); + ceph_msg_put(con->out_msg); + con->out_msg = NULL; + } + if (con->bounce_page) { + __free_page(con->bounce_page); + con->bounce_page = NULL; + } + + if (ceph_msgr2(from_msgr(con->msgr))) + ceph_con_v2_reset_protocol(con); + else + ceph_con_v1_reset_protocol(con); +} + +/* + * 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); + } +} + +void ceph_con_reset_session(struct ceph_connection *con) +{ + dout("%s con %p\n", __func__, con); + + WARN_ON(con->in_msg); + WARN_ON(con->out_msg); + ceph_msg_remove_list(&con->out_queue); + ceph_msg_remove_list(&con->out_sent); + con->out_seq = 0; + con->in_seq = 0; + con->in_seq_acked = 0; + + if (ceph_msgr2(from_msgr(con->msgr))) + ceph_con_v2_reset_session(con); + else + ceph_con_v1_reset_session(con); +} + +/* + * 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)); + con->state = CEPH_CON_S_CLOSED; + + ceph_con_flag_clear(con, CEPH_CON_F_LOSSYTX); /* so we retry next + connect */ + ceph_con_flag_clear(con, CEPH_CON_F_KEEPALIVE_PENDING); + ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING); + ceph_con_flag_clear(con, CEPH_CON_F_BACKOFF); + + ceph_con_reset_protocol(con); + ceph_con_reset_session(con); + cancel_con(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)); + + WARN_ON(con->state != CEPH_CON_S_CLOSED); + con->state = CEPH_CON_S_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) +{ + if (ceph_msgr2(from_msgr(con->msgr))) + return ceph_con_v2_opened(con); + + return ceph_con_v1_opened(con); +} + +/* + * 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 = CEPH_CON_S_CLOSED; +} +EXPORT_SYMBOL(ceph_con_init); + +/* + * We maintain a global counter to order connection attempts. Get + * a unique seq greater than @gt. + */ +u32 ceph_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; +} + +/* + * Discard messages that have been acked by the server. + */ +void ceph_con_discard_sent(struct ceph_connection *con, u64 ack_seq) +{ + struct ceph_msg *msg; + u64 seq; + + dout("%s con %p ack_seq %llu\n", __func__, con, ack_seq); + while (!list_empty(&con->out_sent)) { + msg = list_first_entry(&con->out_sent, struct ceph_msg, + list_head); + WARN_ON(msg->needs_out_seq); + seq = le64_to_cpu(msg->hdr.seq); + if (seq > ack_seq) + break; + + dout("%s con %p discarding msg %p seq %llu\n", __func__, con, + msg, seq); + ceph_msg_remove(msg); + } +} + +/* + * Discard messages that have been requeued in con_fault(), up to + * reconnect_seq. This avoids gratuitously resending messages that + * the server had received and handled prior to reconnect. + */ +void ceph_con_discard_requeued(struct ceph_connection *con, u64 reconnect_seq) +{ + struct ceph_msg *msg; + u64 seq; + + dout("%s con %p reconnect_seq %llu\n", __func__, con, reconnect_seq); + while (!list_empty(&con->out_queue)) { + msg = list_first_entry(&con->out_queue, struct ceph_msg, + list_head); + if (msg->needs_out_seq) + break; + seq = le64_to_cpu(msg->hdr.seq); + if (seq > reconnect_seq) + break; + + dout("%s con %p discarding msg %p seq %llu\n", __func__, con, + msg, seq); + ceph_msg_remove(msg); + } +} + +#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 ceph_bio_iter *it = &cursor->bio_iter; + + cursor->resid = min_t(size_t, length, data->bio_length); + *it = data->bio_pos; + if (cursor->resid < it->iter.bi_size) + it->iter.bi_size = cursor->resid; + + BUG_ON(cursor->resid < bio_iter_len(it->bio, it->iter)); +} + +static struct page *ceph_msg_data_bio_next(struct ceph_msg_data_cursor *cursor, + size_t *page_offset, + size_t *length) +{ + struct bio_vec bv = bio_iter_iovec(cursor->bio_iter.bio, + cursor->bio_iter.iter); + + *page_offset = bv.bv_offset; + *length = bv.bv_len; + return bv.bv_page; +} + +static bool ceph_msg_data_bio_advance(struct ceph_msg_data_cursor *cursor, + size_t bytes) +{ + struct ceph_bio_iter *it = &cursor->bio_iter; + struct page *page = bio_iter_page(it->bio, it->iter); + + BUG_ON(bytes > cursor->resid); + BUG_ON(bytes > bio_iter_len(it->bio, it->iter)); + cursor->resid -= bytes; + bio_advance_iter(it->bio, &it->iter, bytes); + + if (!cursor->resid) + return false; /* no more data */ + + if (!bytes || (it->iter.bi_size && it->iter.bi_bvec_done && + page == bio_iter_page(it->bio, it->iter))) + return false; /* more bytes to process in this segment */ + + if (!it->iter.bi_size) { + it->bio = it->bio->bi_next; + it->iter = it->bio->bi_iter; + if (cursor->resid < it->iter.bi_size) + it->iter.bi_size = cursor->resid; + } + + BUG_ON(cursor->resid < bio_iter_len(it->bio, it->iter)); + return true; +} +#endif /* CONFIG_BLOCK */ + +static void ceph_msg_data_bvecs_cursor_init(struct ceph_msg_data_cursor *cursor, + size_t length) +{ + struct ceph_msg_data *data = cursor->data; + struct bio_vec *bvecs = data->bvec_pos.bvecs; + + cursor->resid = min_t(size_t, length, data->bvec_pos.iter.bi_size); + cursor->bvec_iter = data->bvec_pos.iter; + cursor->bvec_iter.bi_size = cursor->resid; + + BUG_ON(cursor->resid < bvec_iter_len(bvecs, cursor->bvec_iter)); +} + +static struct page *ceph_msg_data_bvecs_next(struct ceph_msg_data_cursor *cursor, + size_t *page_offset, + size_t *length) +{ + struct bio_vec bv = bvec_iter_bvec(cursor->data->bvec_pos.bvecs, + cursor->bvec_iter); + + *page_offset = bv.bv_offset; + *length = bv.bv_len; + return bv.bv_page; +} + +static bool ceph_msg_data_bvecs_advance(struct ceph_msg_data_cursor *cursor, + size_t bytes) +{ + struct bio_vec *bvecs = cursor->data->bvec_pos.bvecs; + struct page *page = bvec_iter_page(bvecs, cursor->bvec_iter); + + BUG_ON(bytes > cursor->resid); + BUG_ON(bytes > bvec_iter_len(bvecs, cursor->bvec_iter)); + cursor->resid -= bytes; + bvec_iter_advance(bvecs, &cursor->bvec_iter, bytes); + + if (!cursor->resid) + return false; /* no more data */ + + if (!bytes || (cursor->bvec_iter.bi_bvec_done && + page == bvec_iter_page(bvecs, cursor->bvec_iter))) + return false; /* more bytes to process in this segment */ + + BUG_ON(cursor->resid < bvec_iter_len(bvecs, cursor->bvec_iter)); + return true; +} + +/* + * 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); +} + +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; + *length = min_t(size_t, cursor->resid, 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++; + 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; +} + +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; + *length = min_t(size_t, cursor->resid, 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); + 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_BVECS: + ceph_msg_data_bvecs_cursor_init(cursor, length); + break; + case CEPH_MSG_DATA_NONE: + default: + /* BUG(); */ + break; + } + cursor->need_crc = true; +} + +void ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor, + struct ceph_msg *msg, size_t length) +{ + BUG_ON(!length); + BUG_ON(length > msg->data_length); + BUG_ON(!msg->num_data_items); + + cursor->total_resid = length; + cursor->data = msg->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. + */ +struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, + size_t *page_offset, size_t *length) +{ + 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_BVECS: + page = ceph_msg_data_bvecs_next(cursor, page_offset, length); + break; + case CEPH_MSG_DATA_NONE: + default: + page = NULL; + break; + } + + BUG_ON(!page); + BUG_ON(*page_offset + *length > PAGE_SIZE); + BUG_ON(!*length); + BUG_ON(*length > cursor->resid); + + return page; +} + +/* + * Returns true if the result moves the cursor on to the next piece + * of the data item. + */ +void 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_BVECS: + new_piece = ceph_msg_data_bvecs_advance(cursor, bytes); + break; + case CEPH_MSG_DATA_NONE: + default: + BUG(); + break; + } + cursor->total_resid -= bytes; + + if (!cursor->resid && cursor->total_resid) { + cursor->data++; + __ceph_msg_data_cursor_init(cursor); + new_piece = true; + } + cursor->need_crc = new_piece; +} + +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; +} + +bool ceph_addr_is_blank(const struct ceph_entity_addr *addr) +{ + struct sockaddr_storage ss = addr->in_addr; /* align */ + struct in_addr *addr4 = &((struct sockaddr_in *)&ss)->sin_addr; + struct in6_addr *addr6 = &((struct sockaddr_in6 *)&ss)->sin6_addr; + + switch (ss.ss_family) { + case AF_INET: + return addr4->s_addr == htonl(INADDR_ANY); + case AF_INET6: + return ipv6_addr_any(addr6); + default: + return true; + } +} +EXPORT_SYMBOL(ceph_addr_is_blank); + +int ceph_addr_port(const struct ceph_entity_addr *addr) +{ + switch (get_unaligned(&addr->in_addr.ss_family)) { + case AF_INET: + return ntohs(get_unaligned(&((struct sockaddr_in *)&addr->in_addr)->sin_port)); + case AF_INET6: + return ntohs(get_unaligned(&((struct sockaddr_in6 *)&addr->in_addr)->sin6_port)); + } + return 0; +} + +void ceph_addr_set_port(struct ceph_entity_addr *addr, int p) +{ + switch (get_unaligned(&addr->in_addr.ss_family)) { + case AF_INET: + put_unaligned(htons(p), &((struct sockaddr_in *)&addr->in_addr)->sin_port); + break; + case AF_INET6: + put_unaligned(htons(p), &((struct sockaddr_in6 *)&addr->in_addr)->sin6_port); + break; + } +} + +/* + * Unlike other *_pton function semantics, zero indicates success. + */ +static int ceph_pton(const char *str, size_t len, struct ceph_entity_addr *addr, + char delim, const char **ipend) +{ + memset(&addr->in_addr, 0, sizeof(addr->in_addr)); + + if (in4_pton(str, len, (u8 *)&((struct sockaddr_in *)&addr->in_addr)->sin_addr.s_addr, delim, ipend)) { + put_unaligned(AF_INET, &addr->in_addr.ss_family); + return 0; + } + + if (in6_pton(str, len, (u8 *)&((struct sockaddr_in6 *)&addr->in_addr)->sin6_addr.s6_addr, delim, ipend)) { + put_unaligned(AF_INET6, &addr->in_addr.ss_family); + 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 ceph_entity_addr *addr, 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(current->nsproxy->net_ns, + NULL, name, end - name, NULL, &ip_addr, NULL, false); + if (ip_len > 0) + ret = ceph_pton(ip_addr, ip_len, addr, -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(addr)); + + return ret; +} +#else +static inline int ceph_dns_resolve_name(const char *name, size_t namelen, + struct ceph_entity_addr *addr, 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 ceph_entity_addr *addr, char delim, const char **ipend) +{ + int ret; + + ret = ceph_pton(name, namelen, addr, delim, ipend); + if (ret) + ret = ceph_dns_resolve_name(name, namelen, addr, 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, char delim) +{ + 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++) { + char cur_delim = delim; + const char *ipend; + int port; + + if (*p == '[') { + cur_delim = ']'; + p++; + } + + ret = ceph_parse_server_name(p, end - p, &addr[i], cur_delim, + &ipend); + if (ret) + goto bad; + ret = -EINVAL; + + p = ipend; + + if (cur_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; + } + + ceph_addr_set_port(&addr[i], port); + /* + * We want the type to be set according to ms_mode + * option, but options are normally parsed after mon + * addresses. Rather than complicating parsing, set + * to LEGACY and override in build_initial_monmap() + * for mon addresses and ceph_messenger_init() for + * ip option. + */ + addr[i].type = CEPH_ENTITY_ADDR_TYPE_LEGACY; + addr[i].nonce = 0; + + dout("%s got %s\n", __func__, ceph_pr_addr(&addr[i])); + + if (p == end) + break; + if (*p != delim) + goto bad; + p++; + } + + if (p != end) + goto bad; + + if (count) + *count = i + 1; + return 0; + +bad: + return ret; +} + +/* + * 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. + */ +void ceph_con_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+%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.middle_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); +} + +/* + * 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 (delay >= HZ) + delay = round_jiffies_relative(delay); + + dout("%s %p %lu\n", __func__, con, delay); + if (!queue_delayed_work(ceph_msgr_wq, &con->work, delay)) { + dout("%s %p - already queued\n", __func__, con); + con->ops->put(con); + return -EBUSY; + } + + 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 (!ceph_con_flag_test_and_clear(con, CEPH_CON_F_SOCK_CLOSED)) + return false; + +#define CASE(x) \ + case CEPH_CON_S_ ## x: \ + con->error_msg = "socket closed (con state " #x ")"; \ + break; + + switch (con->state) { + CASE(CLOSED); + CASE(PREOPEN); + CASE(V1_BANNER); + CASE(V1_CONNECT_MSG); + CASE(V2_BANNER_PREFIX); + CASE(V2_BANNER_PAYLOAD); + CASE(V2_HELLO); + CASE(V2_AUTH); + CASE(V2_AUTH_SIGNATURE); + CASE(V2_SESSION_CONNECT); + CASE(V2_SESSION_RECONNECT); + CASE(OPEN); + CASE(STANDBY); + default: + BUG(); + } +#undef CASE + + return true; +} + +static bool con_backoff(struct ceph_connection *con) +{ + int ret; + + if (!ceph_con_flag_test_and_clear(con, CEPH_CON_F_BACKOFF)) + return false; + + ret = queue_con_delay(con, con->delay); + if (ret) { + dout("%s: con %p FAILED to back off %lu\n", __func__, + con, con->delay); + BUG_ON(ret == -ENOENT); + ceph_con_flag_set(con, CEPH_CON_F_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->v1.auth_retry) { + dout("auth_retry %d, invalidating\n", con->v1.auth_retry); + if (con->ops->invalidate_authorizer) + con->ops->invalidate_authorizer(con); + con->v1.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 == CEPH_CON_S_STANDBY) { + dout("%s: con %p STANDBY\n", __func__, con); + break; + } + if (con->state == CEPH_CON_S_CLOSED) { + dout("%s: con %p CLOSED\n", __func__, con); + BUG_ON(con->sock); + break; + } + if (con->state == CEPH_CON_S_PREOPEN) { + dout("%s: con %p PREOPEN\n", __func__, con); + BUG_ON(con->sock); + } + + if (ceph_msgr2(from_msgr(con->msgr))) + ret = ceph_con_v2_try_read(con); + else + ret = ceph_con_v1_try_read(con); + if (ret < 0) { + if (ret == -EAGAIN) + continue; + if (!con->error_msg) + con->error_msg = "socket error on read"; + fault = true; + break; + } + + if (ceph_msgr2(from_msgr(con->msgr))) + ret = ceph_con_v2_try_write(con); + else + ret = ceph_con_v1_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 %d to peer %s\n", + con, con->state, ceph_pr_addr(&con->peer_addr)); + + pr_warn("%s%lld %s %s\n", ENTITY_NAME(con->peer_name), + ceph_pr_addr(&con->peer_addr), con->error_msg); + con->error_msg = NULL; + + WARN_ON(con->state == CEPH_CON_S_STANDBY || + con->state == CEPH_CON_S_CLOSED); + + ceph_con_reset_protocol(con); + + if (ceph_con_flag_test(con, CEPH_CON_F_LOSSYTX)) { + dout("fault on LOSSYTX channel, marking CLOSED\n"); + con->state = CEPH_CON_S_CLOSED; + return; + } + + /* 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) && + !ceph_con_flag_test(con, CEPH_CON_F_KEEPALIVE_PENDING)) { + dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con); + ceph_con_flag_clear(con, CEPH_CON_F_WRITE_PENDING); + con->state = CEPH_CON_S_STANDBY; + } else { + /* retry after a delay. */ + con->state = CEPH_CON_S_PREOPEN; + if (!con->delay) { + con->delay = BASE_DELAY_INTERVAL; + } else if (con->delay < MAX_DELAY_INTERVAL) { + con->delay *= 2; + if (con->delay > MAX_DELAY_INTERVAL) + con->delay = MAX_DELAY_INTERVAL; + } + ceph_con_flag_set(con, CEPH_CON_F_BACKOFF); + queue_con(con); + } +} + +void ceph_messenger_reset_nonce(struct ceph_messenger *msgr) +{ + u32 nonce = le32_to_cpu(msgr->inst.addr.nonce) + 1000000; + msgr->inst.addr.nonce = cpu_to_le32(nonce); + ceph_encode_my_addr(msgr); +} + +/* + * 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) { + memcpy(&msgr->inst.addr.in_addr, &myaddr->in_addr, + sizeof(msgr->inst.addr.in_addr)); + ceph_addr_set_port(&msgr->inst.addr, 0); + } + + /* + * Since nautilus, clients are identified using type ANY. + * For msgr1, ceph_encode_banner_addr() munges it to NONE. + */ + msgr->inst.addr.type = CEPH_ENTITY_ADDR_TYPE_ANY; + + /* generate a random non-zero nonce */ + do { + get_random_bytes(&msgr->inst.addr.nonce, + sizeof(msgr->inst.addr.nonce)); + } while (!msgr->inst.addr.nonce); + ceph_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); +} + +void ceph_messenger_fini(struct ceph_messenger *msgr) +{ + put_net(read_pnet(&msgr->net)); +} + +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 == CEPH_CON_S_STANDBY) { + dout("clear_standby %p and ++connect_seq\n", con); + con->state = CEPH_CON_S_PREOPEN; + con->v1.connect_seq++; + WARN_ON(ceph_con_flag_test(con, CEPH_CON_F_WRITE_PENDING)); + WARN_ON(ceph_con_flag_test(con, CEPH_CON_F_KEEPALIVE_PENDING)); + } +} + +/* + * Queue up an outgoing message on the given connection. + * + * Consumes a ref on @msg. + */ +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 == CEPH_CON_S_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 (!ceph_con_flag_test_and_set(con, CEPH_CON_F_WRITE_PENDING)) + 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)) { + WARN_ON(con->out_msg == msg); + dout("%s con %p msg %p not linked\n", __func__, con, msg); + mutex_unlock(&con->mutex); + return; + } + + dout("%s con %p msg %p was linked\n", __func__, con, msg); + msg->hdr.seq = 0; + ceph_msg_remove(msg); + + if (con->out_msg == msg) { + WARN_ON(con->state != CEPH_CON_S_OPEN); + dout("%s con %p msg %p was sending\n", __func__, con, msg); + if (ceph_msgr2(from_msgr(con->msgr))) + ceph_con_v2_revoke(con); + else + ceph_con_v1_revoke(con); + ceph_msg_put(con->out_msg); + con->out_msg = NULL; + } else { + dout("%s con %p msg %p not current, out_msg %p\n", __func__, + con, msg, con->out_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) { + WARN_ON(con->state != CEPH_CON_S_OPEN); + dout("%s con %p msg %p was recving\n", __func__, con, msg); + if (ceph_msgr2(from_msgr(con->msgr))) + ceph_con_v2_revoke_incoming(con); + else + ceph_con_v1_revoke_incoming(con); + ceph_msg_put(con->in_msg); + con->in_msg = NULL; + } else { + dout("%s con %p msg %p not current, in_msg %p\n", __func__, + con, msg, con->in_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); + ceph_con_flag_set(con, CEPH_CON_F_KEEPALIVE_PENDING); + mutex_unlock(&con->mutex); + + if (!ceph_con_flag_test_and_set(con, CEPH_CON_F_WRITE_PENDING)) + 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 timespec64 now; + struct timespec64 ts; + ktime_get_real_ts64(&now); + jiffies_to_timespec64(interval, &ts); + ts = timespec64_add(con->last_keepalive_ack, ts); + return timespec64_compare(&now, &ts) >= 0; + } + return false; +} + +static struct ceph_msg_data *ceph_msg_data_add(struct ceph_msg *msg) +{ + BUG_ON(msg->num_data_items >= msg->max_data_items); + return &msg->data[msg->num_data_items++]; +} + +static void ceph_msg_data_destroy(struct ceph_msg_data *data) +{ + if (data->type == CEPH_MSG_DATA_PAGES && data->own_pages) { + int num_pages = calc_pages_for(data->alignment, data->length); + ceph_release_page_vector(data->pages, num_pages); + } else if (data->type == CEPH_MSG_DATA_PAGELIST) { + ceph_pagelist_release(data->pagelist); + } +} + +void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, + size_t length, size_t alignment, bool own_pages) +{ + struct ceph_msg_data *data; + + BUG_ON(!pages); + BUG_ON(!length); + + data = ceph_msg_data_add(msg); + data->type = CEPH_MSG_DATA_PAGES; + data->pages = pages; + data->length = length; + data->alignment = alignment & ~PAGE_MASK; + data->own_pages = own_pages; + + 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_add(msg); + data->type = CEPH_MSG_DATA_PAGELIST; + refcount_inc(&pagelist->refcnt); + data->pagelist = pagelist; + + 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 ceph_bio_iter *bio_pos, + u32 length) +{ + struct ceph_msg_data *data; + + data = ceph_msg_data_add(msg); + data->type = CEPH_MSG_DATA_BIO; + data->bio_pos = *bio_pos; + data->bio_length = length; + + msg->data_length += length; +} +EXPORT_SYMBOL(ceph_msg_data_add_bio); +#endif /* CONFIG_BLOCK */ + +void ceph_msg_data_add_bvecs(struct ceph_msg *msg, + struct ceph_bvec_iter *bvec_pos) +{ + struct ceph_msg_data *data; + + data = ceph_msg_data_add(msg); + data->type = CEPH_MSG_DATA_BVECS; + data->bvec_pos = *bvec_pos; + + msg->data_length += bvec_pos->iter.bi_size; +} +EXPORT_SYMBOL(ceph_msg_data_add_bvecs); + +/* + * construct a new message with given type, size + * the new msg has a ref count of 1. + */ +struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items, + 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); + + /* front */ + if (front_len) { + m->front.iov_base = 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; + + if (max_data_items) { + m->data = kmalloc_array(max_data_items, sizeof(*m->data), + flags); + if (!m->data) + goto out2; + + m->max_data_items = max_data_items; + } + + 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_new2); + +struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, + bool can_fail) +{ + return ceph_msg_new2(type, front_len, 0, flags, can_fail); +} +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 + */ +int ceph_con_in_msg_alloc(struct ceph_connection *con, + struct ceph_msg_header *hdr, int *skip) +{ + 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 != CEPH_CON_S_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, hdr, sizeof(*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; +} + +void ceph_con_get_out_msg(struct ceph_connection *con) +{ + struct ceph_msg *msg; + + BUG_ON(list_empty(&con->out_queue)); + msg = list_first_entry(&con->out_queue, struct ceph_msg, list_head); + WARN_ON(msg->con != con); + + /* + * Put the message on "sent" list using a ref from ceph_con_send(). + * It is put when the message is acked or revoked. + */ + list_move_tail(&msg->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 (msg->needs_out_seq) { + msg->hdr.seq = cpu_to_le64(++con->out_seq); + msg->needs_out_seq = false; + + if (con->ops->reencode_message) + con->ops->reencode_message(msg); + } + + /* + * Get a ref for out_msg. It is put when we are done sending the + * message or in case of a fault. + */ + WARN_ON(con->out_msg); + con->out_msg = ceph_msg_get(msg); +} + +/* + * 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); + kfree(m->data); + 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); + int i; + + 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; + } + + for (i = 0; i < m->num_data_items; i++) + ceph_msg_data_destroy(&m->data[i]); + + 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); |