#ifndef __FS_CEPH_MESSENGER_H #define __FS_CEPH_MESSENGER_H #include #include #include #include #include #include #include "types.h" #include "buffer.h" struct ceph_msg; struct ceph_connection; extern struct workqueue_struct *ceph_msgr_wq; /* receive work queue */ /* * Ceph defines these callbacks for handling connection events. */ struct ceph_connection_operations { struct ceph_connection *(*get)(struct ceph_connection *); void (*put)(struct ceph_connection *); /* handle an incoming message. */ void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m); /* protocol version mismatch */ void (*bad_proto) (struct ceph_connection *con); /* there was some error on the socket (disconnect, whatever) */ void (*fault) (struct ceph_connection *con); /* a remote host as terminated a message exchange session, and messages * we sent (or they tried to send us) may be lost. */ void (*peer_reset) (struct ceph_connection *con); struct ceph_msg * (*alloc_msg) (struct ceph_connection *con, struct ceph_msg_header *hdr); int (*alloc_middle) (struct ceph_connection *con, struct ceph_msg *msg); /* an incoming message has a data payload; tell me what pages I * should read the data into. */ int (*prepare_pages) (struct ceph_connection *con, struct ceph_msg *m, int want); }; extern const char *ceph_name_type_str(int t); /* use format string %s%d */ #define ENTITY_NAME(n) ceph_name_type_str((n).type), le64_to_cpu((n).num) struct ceph_messenger { struct ceph_entity_inst inst; /* my name+address */ struct ceph_entity_addr my_enc_addr; struct page *zero_page; /* used in certain error cases */ bool nocrc; /* * the global_seq counts connections i (attempt to) initiate * in order to disambiguate certain connect race conditions. */ u32 global_seq; spinlock_t global_seq_lock; }; /* * a single message. it contains a header (src, dest, message type, etc.), * footer (crc values, mainly), a "front" message body, and possibly a * data payload (stored in some number of pages). */ struct ceph_msg { struct ceph_msg_header hdr; /* header */ struct ceph_msg_footer footer; /* footer */ struct kvec front; /* unaligned blobs of message */ struct ceph_buffer *middle; struct page **pages; /* data payload. NOT OWNER. */ unsigned nr_pages; /* size of page array */ struct list_head list_head; atomic_t nref; bool front_is_vmalloc; bool more_to_follow; int front_max; struct ceph_msgpool *pool; }; struct ceph_msg_pos { int page, page_pos; /* which page; offset in page */ int data_pos; /* offset in data payload */ int did_page_crc; /* true if we've calculated crc for current page */ }; /* ceph connection fault delay defaults, for exponential backoff */ #define BASE_DELAY_INTERVAL (HZ/2) #define MAX_DELAY_INTERVAL (5 * 60 * HZ) /* * ceph_connection state bit flags * * QUEUED and BUSY are used together to ensure that only a single * thread is currently opening, reading or writing data to the socket. */ #define LOSSYTX 0 /* we can close channel or drop messages on errors */ #define LOSSYRX 1 /* peer may reset/drop messages */ #define CONNECTING 2 #define KEEPALIVE_PENDING 3 #define WRITE_PENDING 4 /* we have data ready to send */ #define QUEUED 5 /* there is work queued on this connection */ #define BUSY 6 /* work is being done */ #define STANDBY 8 /* no outgoing messages, socket closed. we keep * the ceph_connection around to maintain shared * state with the peer. */ #define CLOSED 10 /* we've closed the connection */ #define SOCK_CLOSED 11 /* socket state changed to closed */ #define REGISTERED 12 /* connection appears in con_tree */ #define OPENING 13 /* open connection w/ (possibly new) peer */ #define DEAD 14 /* dead, about to kfree */ /* * A single connection with another host. * * We maintain a queue of outgoing messages, and some session state to * ensure that we can preserve the lossless, ordered delivery of * messages in the case of a TCP disconnect. */ struct ceph_connection { void *private; atomic_t nref; const struct ceph_connection_operations *ops; struct ceph_messenger *msgr; struct socket *sock; unsigned long state; /* connection state (see flags above) */ const char *error_msg; /* error message, if any */ struct ceph_entity_addr peer_addr; /* peer address */ struct ceph_entity_name peer_name; /* peer name */ struct ceph_entity_addr peer_addr_for_me; u32 connect_seq; /* identify the most recent connection attempt for this connection, client */ u32 peer_global_seq; /* peer's global seq for this connection */ /* out queue */ struct mutex out_mutex; struct list_head out_queue; struct list_head out_sent; /* sending or sent but unacked */ u64 out_seq; /* last message queued for send */ u64 out_seq_sent; /* last message sent */ bool out_keepalive_pending; u64 in_seq, in_seq_acked; /* last message received, acked */ /* connection negotiation temps */ char in_banner[CEPH_BANNER_MAX_LEN]; union { struct { /* outgoing connection */ struct ceph_msg_connect out_connect; struct ceph_msg_connect_reply in_reply; }; struct { /* incoming */ struct ceph_msg_connect in_connect; struct ceph_msg_connect_reply out_reply; }; }; struct ceph_entity_addr actual_peer_addr; /* message out temps */ struct ceph_msg *out_msg; /* sending message (== tail of out_sent) */ struct ceph_msg_pos out_msg_pos; struct kvec out_kvec[8], /* sending header/footer data */ *out_kvec_cur; int out_kvec_left; /* kvec's left in out_kvec */ int out_skip; /* skip this many bytes */ int out_kvec_bytes; /* total bytes left */ bool out_kvec_is_msg; /* kvec refers to out_msg */ int out_more; /* there is more data after the kvecs */ __le64 out_temp_ack; /* for writing an ack */ /* message in temps */ struct ceph_msg_header in_hdr; struct ceph_msg *in_msg; struct ceph_msg_pos in_msg_pos; u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */ char in_tag; /* protocol control byte */ int in_base_pos; /* bytes read */ __le64 in_temp_ack; /* for reading an ack */ struct delayed_work work; /* send|recv work */ unsigned long delay; /* current delay interval */ }; extern const char *pr_addr(const struct sockaddr_storage *ss); extern int ceph_parse_ips(const char *c, const char *end, struct ceph_entity_addr *addr, int max_count, int *count); extern int ceph_msgr_init(void); extern void ceph_msgr_exit(void); extern struct ceph_messenger *ceph_messenger_create( struct ceph_entity_addr *myaddr); extern void ceph_messenger_destroy(struct ceph_messenger *); extern void ceph_con_init(struct ceph_messenger *msgr, struct ceph_connection *con); extern void ceph_con_shutdown(struct ceph_connection *con); extern void ceph_con_open(struct ceph_connection *con, struct ceph_entity_addr *addr); extern void ceph_con_close(struct ceph_connection *con); extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg); extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg); extern void ceph_con_keepalive(struct ceph_connection *con); extern struct ceph_connection *ceph_con_get(struct ceph_connection *con); extern void ceph_con_put(struct ceph_connection *con); extern struct ceph_msg *ceph_msg_new(int type, int front_len, int page_len, int page_off, struct page **pages); extern void ceph_msg_kfree(struct ceph_msg *m); extern struct ceph_msg *ceph_alloc_msg(struct ceph_connection *con, struct ceph_msg_header *hdr); extern int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg); static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) { dout("ceph_msg_get %p %d -> %d\n", msg, atomic_read(&msg->nref), atomic_read(&msg->nref)+1); atomic_inc(&msg->nref); return msg; } extern void ceph_msg_put(struct ceph_msg *msg); #endif