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#ifndef __FS_CEPH_MESSENGER_H
#define __FS_CEPH_MESSENGER_H
#include <linux/mutex.h>
#include <linux/net.h>
#include <linux/radix-tree.h>
#include <linux/uio.h>
#include <linux/version.h>
#include <linux/workqueue.h>
#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
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