1 #ifndef __FS_CEPH_MESSENGER_H
2 #define __FS_CEPH_MESSENGER_H
4 #include <linux/blk_types.h>
5 #include <linux/kref.h>
6 #include <linux/mutex.h>
8 #include <linux/radix-tree.h>
10 #include <linux/workqueue.h>
11 #include <net/net_namespace.h>
13 #include <linux/ceph/types.h>
14 #include <linux/ceph/buffer.h>
17 struct ceph_connection
;
20 * Ceph defines these callbacks for handling connection events.
22 struct ceph_connection_operations
{
23 struct ceph_connection
*(*get
)(struct ceph_connection
*);
24 void (*put
)(struct ceph_connection
*);
26 /* handle an incoming message. */
27 void (*dispatch
) (struct ceph_connection
*con
, struct ceph_msg
*m
);
29 /* authorize an outgoing connection */
30 struct ceph_auth_handshake
*(*get_authorizer
) (
31 struct ceph_connection
*con
,
32 int *proto
, int force_new
);
33 int (*verify_authorizer_reply
) (struct ceph_connection
*con
, int len
);
34 int (*invalidate_authorizer
)(struct ceph_connection
*con
);
36 /* there was some error on the socket (disconnect, whatever) */
37 void (*fault
) (struct ceph_connection
*con
);
39 /* a remote host as terminated a message exchange session, and messages
40 * we sent (or they tried to send us) may be lost. */
41 void (*peer_reset
) (struct ceph_connection
*con
);
43 struct ceph_msg
* (*alloc_msg
) (struct ceph_connection
*con
,
44 struct ceph_msg_header
*hdr
,
46 int (*sign_message
) (struct ceph_connection
*con
, struct ceph_msg
*msg
);
48 int (*check_message_signature
) (struct ceph_connection
*con
,
49 struct ceph_msg
*msg
);
52 /* use format string %s%d */
53 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
55 struct ceph_messenger
{
56 struct ceph_entity_inst inst
; /* my name+address */
57 struct ceph_entity_addr my_enc_addr
;
65 * the global_seq counts connections i (attempt to) initiate
66 * in order to disambiguate certain connect race conditions.
69 spinlock_t global_seq_lock
;
71 u64 supported_features
;
72 u64 required_features
;
75 enum ceph_msg_data_type
{
76 CEPH_MSG_DATA_NONE
, /* message contains no data payload */
77 CEPH_MSG_DATA_PAGES
, /* data source/destination is a page array */
78 CEPH_MSG_DATA_PAGELIST
, /* data source/destination is a pagelist */
80 CEPH_MSG_DATA_BIO
, /* data source/destination is a bio list */
81 #endif /* CONFIG_BLOCK */
84 static __inline__
bool ceph_msg_data_type_valid(enum ceph_msg_data_type type
)
87 case CEPH_MSG_DATA_NONE
:
88 case CEPH_MSG_DATA_PAGES
:
89 case CEPH_MSG_DATA_PAGELIST
:
91 case CEPH_MSG_DATA_BIO
:
92 #endif /* CONFIG_BLOCK */
99 struct ceph_msg_data
{
100 struct list_head links
; /* ceph_msg->data */
101 enum ceph_msg_data_type type
;
108 #endif /* CONFIG_BLOCK */
110 struct page
**pages
; /* NOT OWNER. */
111 size_t length
; /* total # bytes */
112 unsigned int alignment
; /* first page */
114 struct ceph_pagelist
*pagelist
;
118 struct ceph_msg_data_cursor
{
119 size_t total_resid
; /* across all data items */
120 struct list_head
*data_head
; /* = &ceph_msg->data */
122 struct ceph_msg_data
*data
; /* current data item */
123 size_t resid
; /* bytes not yet consumed */
124 bool last_piece
; /* current is last piece */
125 bool need_crc
; /* crc update needed */
129 struct bio
*bio
; /* bio from list */
130 struct bvec_iter bvec_iter
;
132 #endif /* CONFIG_BLOCK */
134 unsigned int page_offset
; /* offset in page */
135 unsigned short page_index
; /* index in array */
136 unsigned short page_count
; /* pages in array */
138 struct { /* pagelist */
139 struct page
*page
; /* page from list */
140 size_t offset
; /* bytes from list */
146 * a single message. it contains a header (src, dest, message type, etc.),
147 * footer (crc values, mainly), a "front" message body, and possibly a
148 * data payload (stored in some number of pages).
151 struct ceph_msg_header hdr
; /* header */
153 struct ceph_msg_footer footer
; /* footer */
154 struct ceph_msg_footer_old old_footer
; /* old format footer */
156 struct kvec front
; /* unaligned blobs of message */
157 struct ceph_buffer
*middle
;
160 struct list_head data
;
161 struct ceph_msg_data_cursor cursor
;
163 struct ceph_connection
*con
;
164 struct list_head list_head
; /* links for connection lists */
170 unsigned long ack_stamp
; /* tx: when we were acked */
172 struct ceph_msgpool
*pool
;
175 /* ceph connection fault delay defaults, for exponential backoff */
176 #define BASE_DELAY_INTERVAL (HZ/2)
177 #define MAX_DELAY_INTERVAL (5 * 60 * HZ)
180 * A single connection with another host.
182 * We maintain a queue of outgoing messages, and some session state to
183 * ensure that we can preserve the lossless, ordered delivery of
184 * messages in the case of a TCP disconnect.
186 struct ceph_connection
{
189 const struct ceph_connection_operations
*ops
;
191 struct ceph_messenger
*msgr
;
195 struct ceph_entity_addr peer_addr
; /* peer address */
196 struct ceph_entity_addr peer_addr_for_me
;
200 const char *error_msg
; /* error message, if any */
202 struct ceph_entity_name peer_name
; /* peer name */
205 u32 connect_seq
; /* identify the most recent connection
206 attempt for this connection, client */
207 u32 peer_global_seq
; /* peer's global seq for this connection */
209 int auth_retry
; /* true if we need a newer authorizer */
210 void *auth_reply_buf
; /* where to put the authorizer reply */
211 int auth_reply_buf_len
;
216 struct list_head out_queue
;
217 struct list_head out_sent
; /* sending or sent but unacked */
218 u64 out_seq
; /* last message queued for send */
220 u64 in_seq
, in_seq_acked
; /* last message received, acked */
222 /* connection negotiation temps */
223 char in_banner
[CEPH_BANNER_MAX_LEN
];
224 struct ceph_msg_connect out_connect
;
225 struct ceph_msg_connect_reply in_reply
;
226 struct ceph_entity_addr actual_peer_addr
;
228 /* message out temps */
229 struct ceph_msg
*out_msg
; /* sending message (== tail of
233 struct kvec out_kvec
[8], /* sending header/footer data */
235 int out_kvec_left
; /* kvec's left in out_kvec */
236 int out_skip
; /* skip this many bytes */
237 int out_kvec_bytes
; /* total bytes left */
238 bool out_kvec_is_msg
; /* kvec refers to out_msg */
239 int out_more
; /* there is more data after the kvecs */
240 __le64 out_temp_ack
; /* for writing an ack */
242 /* message in temps */
243 struct ceph_msg_header in_hdr
;
244 struct ceph_msg
*in_msg
;
245 u32 in_front_crc
, in_middle_crc
, in_data_crc
; /* calculated crc */
247 char in_tag
; /* protocol control byte */
248 int in_base_pos
; /* bytes read */
249 __le64 in_temp_ack
; /* for reading an ack */
251 struct timespec last_keepalive_ack
;
253 struct delayed_work work
; /* send|recv work */
254 unsigned long delay
; /* current delay interval */
258 extern const char *ceph_pr_addr(const struct sockaddr_storage
*ss
);
259 extern int ceph_parse_ips(const char *c
, const char *end
,
260 struct ceph_entity_addr
*addr
,
261 int max_count
, int *count
);
264 extern int ceph_msgr_init(void);
265 extern void ceph_msgr_exit(void);
266 extern void ceph_msgr_flush(void);
268 extern void ceph_messenger_init(struct ceph_messenger
*msgr
,
269 struct ceph_entity_addr
*myaddr
,
270 u64 supported_features
,
271 u64 required_features
,
274 extern void ceph_messenger_fini(struct ceph_messenger
*msgr
);
276 extern void ceph_con_init(struct ceph_connection
*con
, void *private,
277 const struct ceph_connection_operations
*ops
,
278 struct ceph_messenger
*msgr
);
279 extern void ceph_con_open(struct ceph_connection
*con
,
280 __u8 entity_type
, __u64 entity_num
,
281 struct ceph_entity_addr
*addr
);
282 extern bool ceph_con_opened(struct ceph_connection
*con
);
283 extern void ceph_con_close(struct ceph_connection
*con
);
284 extern void ceph_con_send(struct ceph_connection
*con
, struct ceph_msg
*msg
);
286 extern void ceph_msg_revoke(struct ceph_msg
*msg
);
287 extern void ceph_msg_revoke_incoming(struct ceph_msg
*msg
);
289 extern void ceph_con_keepalive(struct ceph_connection
*con
);
290 extern bool ceph_con_keepalive_expired(struct ceph_connection
*con
,
291 unsigned long interval
);
293 extern void ceph_msg_data_add_pages(struct ceph_msg
*msg
, struct page
**pages
,
294 size_t length
, size_t alignment
);
295 extern void ceph_msg_data_add_pagelist(struct ceph_msg
*msg
,
296 struct ceph_pagelist
*pagelist
);
298 extern void ceph_msg_data_add_bio(struct ceph_msg
*msg
, struct bio
*bio
,
300 #endif /* CONFIG_BLOCK */
302 extern struct ceph_msg
*ceph_msg_new(int type
, int front_len
, gfp_t flags
,
305 extern struct ceph_msg
*ceph_msg_get(struct ceph_msg
*msg
);
306 extern void ceph_msg_put(struct ceph_msg
*msg
);
308 extern void ceph_msg_dump(struct ceph_msg
*msg
);