Viewing file:  messenger.h (11.39 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __FS_CEPH_MESSENGER_H
#define __FS_CEPH_MESSENGER_H
#include <linux/bvec.h>
#include <linux/kref.h>
#include <linux/mutex.h>
#include <linux/net.h>
#include <linux/radix-tree.h>
#include <linux/uio.h>
#include <linux/workqueue.h>
#include <net/net_namespace.h>
#include <linux/ceph/types.h>
#include <linux/ceph/buffer.h>
struct ceph_msg;
struct ceph_connection;
/*
* 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);
/* authorize an outgoing connection */
struct ceph_auth_handshake *(*get_authorizer) (
struct ceph_connection *con,
int *proto, int force_new);
int (*add_authorizer_challenge)(struct ceph_connection *con,
void *challenge_buf,
int challenge_buf_len);
int (*verify_authorizer_reply) (struct ceph_connection *con);
int (*invalidate_authorizer)(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 *skip);
void (*reencode_message) (struct ceph_msg *msg);
int (*sign_message) (struct ceph_msg *msg);
int (*check_message_signature) (struct ceph_msg *msg);
};
/* use format string %s%d */
#define ENTITY_NAME(n) ceph_entity_type_name((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;
atomic_t stopping;
possible_net_t net;
/*
* 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;
};
enum ceph_msg_data_type {
CEPH_MSG_DATA_NONE, /* message contains no data payload */
CEPH_MSG_DATA_PAGES, /* data source/destination is a page array */
CEPH_MSG_DATA_PAGELIST, /* data source/destination is a pagelist */
#ifdef CONFIG_BLOCK
CEPH_MSG_DATA_BIO, /* data source/destination is a bio list */
#endif /* CONFIG_BLOCK */
CEPH_MSG_DATA_BVECS, /* data source/destination is a bio_vec array */
};
#ifdef CONFIG_BLOCK
struct ceph_bio_iter {
struct bio *bio;
struct bvec_iter iter;
};
#define __ceph_bio_iter_advance_step(it, n, STEP) do { \
unsigned int __n = (n), __cur_n; \
\
while (__n) { \
BUG_ON(!(it)->iter.bi_size); \
__cur_n = min((it)->iter.bi_size, __n); \
(void)(STEP); \
bio_advance_iter((it)->bio, &(it)->iter, __cur_n); \
if (!(it)->iter.bi_size && (it)->bio->bi_next) { \
dout("__ceph_bio_iter_advance_step next bio\n"); \
(it)->bio = (it)->bio->bi_next; \
(it)->iter = (it)->bio->bi_iter; \
} \
__n -= __cur_n; \
} \
} while (0)
/*
* Advance @it by @n bytes.
*/
#define ceph_bio_iter_advance(it, n) \
__ceph_bio_iter_advance_step(it, n, 0)
/*
* Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
*/
#define ceph_bio_iter_advance_step(it, n, BVEC_STEP) \
__ceph_bio_iter_advance_step(it, n, ({ \
struct bio_vec bv; \
struct bvec_iter __cur_iter; \
\
__cur_iter = (it)->iter; \
__cur_iter.bi_size = __cur_n; \
__bio_for_each_segment(bv, (it)->bio, __cur_iter, __cur_iter) \
(void)(BVEC_STEP); \
}))
#endif /* CONFIG_BLOCK */
struct ceph_bvec_iter {
struct bio_vec *bvecs;
struct bvec_iter iter;
};
#define __ceph_bvec_iter_advance_step(it, n, STEP) do { \
BUG_ON((n) > (it)->iter.bi_size); \
(void)(STEP); \
bvec_iter_advance((it)->bvecs, &(it)->iter, (n)); \
} while (0)
/*
* Advance @it by @n bytes.
*/
#define ceph_bvec_iter_advance(it, n) \
__ceph_bvec_iter_advance_step(it, n, 0)
/*
* Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
*/
#define ceph_bvec_iter_advance_step(it, n, BVEC_STEP) \
__ceph_bvec_iter_advance_step(it, n, ({ \
struct bio_vec bv; \
struct bvec_iter __cur_iter; \
\
__cur_iter = (it)->iter; \
__cur_iter.bi_size = (n); \
for_each_bvec(bv, (it)->bvecs, __cur_iter, __cur_iter) \
(void)(BVEC_STEP); \
}))
#define ceph_bvec_iter_shorten(it, n) do { \
BUG_ON((n) > (it)->iter.bi_size); \
(it)->iter.bi_size = (n); \
} while (0)
struct ceph_msg_data {
enum ceph_msg_data_type type;
union {
#ifdef CONFIG_BLOCK
struct {
struct ceph_bio_iter bio_pos;
u32 bio_length;
};
#endif /* CONFIG_BLOCK */
struct ceph_bvec_iter bvec_pos;
struct {
struct page **pages;
size_t length; /* total # bytes */
unsigned int alignment; /* first page */
bool own_pages;
};
struct ceph_pagelist *pagelist;
};
};
struct ceph_msg_data_cursor {
size_t total_resid; /* across all data items */
struct ceph_msg_data *data; /* current data item */
size_t resid; /* bytes not yet consumed */
bool last_piece; /* current is last piece */
bool need_crc; /* crc update needed */
union {
#ifdef CONFIG_BLOCK
struct ceph_bio_iter bio_iter;
#endif /* CONFIG_BLOCK */
struct bvec_iter bvec_iter;
struct { /* pages */
unsigned int page_offset; /* offset in page */
unsigned short page_index; /* index in array */
unsigned short page_count; /* pages in array */
};
struct { /* pagelist */
struct page *page; /* page from list */
size_t offset; /* bytes from list */
};
};
};
/*
* 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 */
union {
struct ceph_msg_footer footer; /* footer */
struct ceph_msg_footer_old old_footer; /* old format footer */
};
struct kvec front; /* unaligned blobs of message */
struct ceph_buffer *middle;
size_t data_length;
struct ceph_msg_data *data;
int num_data_items;
int max_data_items;
struct ceph_msg_data_cursor cursor;
struct ceph_connection *con;
struct list_head list_head; /* links for connection lists */
struct kref kref;
bool more_to_follow;
bool needs_out_seq;
int front_alloc_len;
unsigned long ack_stamp; /* tx: when we were acked */
struct ceph_msgpool *pool;
};
/* ceph connection fault delay defaults, for exponential backoff */
#define BASE_DELAY_INTERVAL (HZ/2)
#define MAX_DELAY_INTERVAL (5 * 60 * HZ)
/*
* 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;
const struct ceph_connection_operations *ops;
struct ceph_messenger *msgr;
atomic_t sock_state;
struct socket *sock;
struct ceph_entity_addr peer_addr; /* peer address */
struct ceph_entity_addr peer_addr_for_me;
unsigned long flags;
unsigned long state;
const char *error_msg; /* error message, if any */
struct ceph_entity_name peer_name; /* peer name */
u64 peer_features;
u32 connect_seq; /* identify the most recent connection
attempt for this connection, client */
u32 peer_global_seq; /* peer's global seq for this connection */
struct ceph_auth_handshake *auth;
int auth_retry; /* true if we need a newer authorizer */
struct mutex mutex;
/* out queue */
struct list_head out_queue;
struct list_head out_sent; /* sending or sent but unacked */
u64 out_seq; /* last message queued for send */
u64 in_seq, in_seq_acked; /* last message received, acked */
/* connection negotiation temps */
char in_banner[CEPH_BANNER_MAX_LEN];
struct ceph_msg_connect out_connect;
struct ceph_msg_connect_reply in_reply;
struct ceph_entity_addr actual_peer_addr;
/* message out temps */
struct ceph_msg_header out_hdr;
struct ceph_msg *out_msg; /* sending message (== tail of
out_sent) */
bool out_msg_done;
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 */
int out_more; /* there is more data after the kvecs */
__le64 out_temp_ack; /* for writing an ack */
struct ceph_timespec out_temp_keepalive2; /* for writing keepalive2
stamp */
/* message in temps */
struct ceph_msg_header in_hdr;
struct ceph_msg *in_msg;
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 timespec64 last_keepalive_ack; /* keepalive2 ack stamp */
struct delayed_work work; /* send|recv work */
unsigned long delay; /* current delay interval */
};
extern const char *ceph_pr_addr(const struct ceph_entity_addr *addr);
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 void ceph_msgr_flush(void);
extern void ceph_messenger_init(struct ceph_messenger *msgr,
struct ceph_entity_addr *myaddr);
extern void ceph_messenger_fini(struct ceph_messenger *msgr);
extern void ceph_messenger_reset_nonce(struct ceph_messenger *msgr);
extern void ceph_con_init(struct ceph_connection *con, void *private,
const struct ceph_connection_operations *ops,
struct ceph_messenger *msgr);
extern void ceph_con_open(struct ceph_connection *con,
__u8 entity_type, __u64 entity_num,
struct ceph_entity_addr *addr);
extern bool ceph_con_opened(struct ceph_connection *con);
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_msg_revoke(struct ceph_msg *msg);
extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
extern void ceph_con_keepalive(struct ceph_connection *con);
extern bool ceph_con_keepalive_expired(struct ceph_connection *con,
unsigned long interval);
void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
size_t length, size_t alignment, bool own_pages);
extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
struct ceph_pagelist *pagelist);
#ifdef CONFIG_BLOCK
void ceph_msg_data_add_bio(struct ceph_msg *msg, struct ceph_bio_iter *bio_pos,
u32 length);
#endif /* CONFIG_BLOCK */
void ceph_msg_data_add_bvecs(struct ceph_msg *msg,
struct ceph_bvec_iter *bvec_pos);
struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items,
gfp_t flags, bool can_fail);
extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
bool can_fail);
extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg);
extern void ceph_msg_put(struct ceph_msg *msg);
extern void ceph_msg_dump(struct ceph_msg *msg);
#endif
|