1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef __FS_CEPH_MESSENGER_H
3 #define __FS_CEPH_MESSENGER_H
5 #include <linux/bvec.h>
6 #include <linux/kref.h>
7 #include <linux/mutex.h>
9 #include <linux/radix-tree.h>
10 #include <linux/uio.h>
11 #include <linux/workqueue.h>
12 #include <net/net_namespace.h>
14 #include <linux/ceph/types.h>
15 #include <linux/ceph/buffer.h>
18 struct ceph_connection;
21 * Ceph defines these callbacks for handling connection events.
23 struct ceph_connection_operations {
24 struct ceph_connection *(*get)(struct ceph_connection *);
25 void (*put)(struct ceph_connection *);
27 /* handle an incoming message. */
28 void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
30 /* authorize an outgoing connection */
31 struct ceph_auth_handshake *(*get_authorizer) (
32 struct ceph_connection *con,
33 int *proto, int force_new);
34 int (*add_authorizer_challenge)(struct ceph_connection *con,
36 int challenge_buf_len);
37 int (*verify_authorizer_reply) (struct ceph_connection *con);
38 int (*invalidate_authorizer)(struct ceph_connection *con);
40 /* there was some error on the socket (disconnect, whatever) */
41 void (*fault) (struct ceph_connection *con);
43 /* a remote host as terminated a message exchange session, and messages
44 * we sent (or they tried to send us) may be lost. */
45 void (*peer_reset) (struct ceph_connection *con);
47 struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
48 struct ceph_msg_header *hdr,
51 void (*reencode_message) (struct ceph_msg *msg);
53 int (*sign_message) (struct ceph_msg *msg);
54 int (*check_message_signature) (struct ceph_msg *msg);
57 /* use format string %s%d */
58 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
60 struct ceph_messenger {
61 struct ceph_entity_inst inst; /* my name+address */
62 struct ceph_entity_addr my_enc_addr;
68 * the global_seq counts connections i (attempt to) initiate
69 * in order to disambiguate certain connect race conditions.
72 spinlock_t global_seq_lock;
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 struct ceph_auth_handshake *auth;
210 int auth_retry; /* true if we need a newer authorizer */
215 struct list_head out_queue;
216 struct list_head out_sent; /* sending or sent but unacked */
217 u64 out_seq; /* last message queued for send */
219 u64 in_seq, in_seq_acked; /* last message received, acked */
221 /* connection negotiation temps */
222 char in_banner[CEPH_BANNER_MAX_LEN];
223 struct ceph_msg_connect out_connect;
224 struct ceph_msg_connect_reply in_reply;
225 struct ceph_entity_addr actual_peer_addr;
227 /* message out temps */
228 struct ceph_msg_header out_hdr;
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 int out_more; /* there is more data after the kvecs */
239 __le64 out_temp_ack; /* for writing an ack */
240 struct ceph_timespec out_temp_keepalive2; /* for writing keepalive2
243 /* message in temps */
244 struct ceph_msg_header in_hdr;
245 struct ceph_msg *in_msg;
246 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */
248 char in_tag; /* protocol control byte */
249 int in_base_pos; /* bytes read */
250 __le64 in_temp_ack; /* for reading an ack */
252 struct timespec last_keepalive_ack; /* keepalive2 ack stamp */
254 struct delayed_work work; /* send|recv work */
255 unsigned long delay; /* current delay interval */
259 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
260 extern int ceph_parse_ips(const char *c, const char *end,
261 struct ceph_entity_addr *addr,
262 int max_count, int *count);
265 extern int ceph_msgr_init(void);
266 extern void ceph_msgr_exit(void);
267 extern void ceph_msgr_flush(void);
269 extern void ceph_messenger_init(struct ceph_messenger *msgr,
270 struct ceph_entity_addr *myaddr);
271 extern void ceph_messenger_fini(struct ceph_messenger *msgr);
273 extern void ceph_con_init(struct ceph_connection *con, void *private,
274 const struct ceph_connection_operations *ops,
275 struct ceph_messenger *msgr);
276 extern void ceph_con_open(struct ceph_connection *con,
277 __u8 entity_type, __u64 entity_num,
278 struct ceph_entity_addr *addr);
279 extern bool ceph_con_opened(struct ceph_connection *con);
280 extern void ceph_con_close(struct ceph_connection *con);
281 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
283 extern void ceph_msg_revoke(struct ceph_msg *msg);
284 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
286 extern void ceph_con_keepalive(struct ceph_connection *con);
287 extern bool ceph_con_keepalive_expired(struct ceph_connection *con,
288 unsigned long interval);
290 extern void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
291 size_t length, size_t alignment);
292 extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
293 struct ceph_pagelist *pagelist);
295 extern void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
297 #endif /* CONFIG_BLOCK */
299 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
302 extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg);
303 extern void ceph_msg_put(struct ceph_msg *msg);
305 extern void ceph_msg_dump(struct ceph_msg *msg);