1 #ifndef __FS_CEPH_MESSENGER_H
2 #define __FS_CEPH_MESSENGER_H
3
4 #include <linux/blk_types.h>
5 #include <linux/kref.h>
6 #include <linux/mutex.h>
7 #include <linux/net.h>
8 #include <linux/radix-tree.h>
9 #include <linux/uio.h>
10 #include <linux/workqueue.h>
11 #include <net/net_namespace.h>
12
13 #include <linux/ceph/types.h>
14 #include <linux/ceph/buffer.h>
15
16 struct ceph_msg;
17 struct ceph_connection;
18
19 /*
20 * Ceph defines these callbacks for handling connection events.
21 */
22 struct ceph_connection_operations {
23 struct ceph_connection *(*get)(struct ceph_connection *);
24 void (*put)(struct ceph_connection *);
25
26 /* handle an incoming message. */
27 void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
28
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);
35
36 /* there was some error on the socket (disconnect, whatever) */
37 void (*fault) (struct ceph_connection *con);
38
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);
42
43 struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
44 struct ceph_msg_header *hdr,
45 int *skip);
46
47 int (*sign_message) (struct ceph_msg *msg);
48 int (*check_message_signature) (struct ceph_msg *msg);
49 };
50
51 /* use format string %s%d */
52 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
53
54 struct ceph_messenger {
55 struct ceph_entity_inst inst; /* my name+address */
56 struct ceph_entity_addr my_enc_addr;
57
58 atomic_t stopping;
59 possible_net_t net;
60
61 /*
62 * the global_seq counts connections i (attempt to) initiate
63 * in order to disambiguate certain connect race conditions.
64 */
65 u32 global_seq;
66 spinlock_t global_seq_lock;
67 };
68
69 enum ceph_msg_data_type {
70 CEPH_MSG_DATA_NONE, /* message contains no data payload */
71 CEPH_MSG_DATA_PAGES, /* data source/destination is a page array */
72 CEPH_MSG_DATA_PAGELIST, /* data source/destination is a pagelist */
73 #ifdef CONFIG_BLOCK
74 CEPH_MSG_DATA_BIO, /* data source/destination is a bio list */
75 #endif /* CONFIG_BLOCK */
76 };
77
ceph_msg_data_type_valid(enum ceph_msg_data_type type)78 static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type)
79 {
80 switch (type) {
81 case CEPH_MSG_DATA_NONE:
82 case CEPH_MSG_DATA_PAGES:
83 case CEPH_MSG_DATA_PAGELIST:
84 #ifdef CONFIG_BLOCK
85 case CEPH_MSG_DATA_BIO:
86 #endif /* CONFIG_BLOCK */
87 return true;
88 default:
89 return false;
90 }
91 }
92
93 struct ceph_msg_data {
94 struct list_head links; /* ceph_msg->data */
95 enum ceph_msg_data_type type;
96 union {
97 #ifdef CONFIG_BLOCK
98 struct {
99 struct bio *bio;
100 size_t bio_length;
101 };
102 #endif /* CONFIG_BLOCK */
103 struct {
104 struct page **pages; /* NOT OWNER. */
105 size_t length; /* total # bytes */
106 unsigned int alignment; /* first page */
107 };
108 struct ceph_pagelist *pagelist;
109 };
110 };
111
112 struct ceph_msg_data_cursor {
113 size_t total_resid; /* across all data items */
114 struct list_head *data_head; /* = &ceph_msg->data */
115
116 struct ceph_msg_data *data; /* current data item */
117 size_t resid; /* bytes not yet consumed */
118 bool last_piece; /* current is last piece */
119 bool need_crc; /* crc update needed */
120 union {
121 #ifdef CONFIG_BLOCK
122 struct { /* bio */
123 struct bio *bio; /* bio from list */
124 struct bvec_iter bvec_iter;
125 };
126 #endif /* CONFIG_BLOCK */
127 struct { /* pages */
128 unsigned int page_offset; /* offset in page */
129 unsigned short page_index; /* index in array */
130 unsigned short page_count; /* pages in array */
131 };
132 struct { /* pagelist */
133 struct page *page; /* page from list */
134 size_t offset; /* bytes from list */
135 };
136 };
137 };
138
139 /*
140 * a single message. it contains a header (src, dest, message type, etc.),
141 * footer (crc values, mainly), a "front" message body, and possibly a
142 * data payload (stored in some number of pages).
143 */
144 struct ceph_msg {
145 struct ceph_msg_header hdr; /* header */
146 union {
147 struct ceph_msg_footer footer; /* footer */
148 struct ceph_msg_footer_old old_footer; /* old format footer */
149 };
150 struct kvec front; /* unaligned blobs of message */
151 struct ceph_buffer *middle;
152
153 size_t data_length;
154 struct list_head data;
155 struct ceph_msg_data_cursor cursor;
156
157 struct ceph_connection *con;
158 struct list_head list_head; /* links for connection lists */
159
160 struct kref kref;
161 bool more_to_follow;
162 bool needs_out_seq;
163 int front_alloc_len;
164 unsigned long ack_stamp; /* tx: when we were acked */
165
166 struct ceph_msgpool *pool;
167 };
168
169 /* ceph connection fault delay defaults, for exponential backoff */
170 #define BASE_DELAY_INTERVAL (HZ/2)
171 #define MAX_DELAY_INTERVAL (5 * 60 * HZ)
172
173 /*
174 * A single connection with another host.
175 *
176 * We maintain a queue of outgoing messages, and some session state to
177 * ensure that we can preserve the lossless, ordered delivery of
178 * messages in the case of a TCP disconnect.
179 */
180 struct ceph_connection {
181 void *private;
182
183 const struct ceph_connection_operations *ops;
184
185 struct ceph_messenger *msgr;
186
187 atomic_t sock_state;
188 struct socket *sock;
189 struct ceph_entity_addr peer_addr; /* peer address */
190 struct ceph_entity_addr peer_addr_for_me;
191
192 unsigned long flags;
193 unsigned long state;
194 const char *error_msg; /* error message, if any */
195
196 struct ceph_entity_name peer_name; /* peer name */
197
198 u64 peer_features;
199 u32 connect_seq; /* identify the most recent connection
200 attempt for this connection, client */
201 u32 peer_global_seq; /* peer's global seq for this connection */
202
203 int auth_retry; /* true if we need a newer authorizer */
204 void *auth_reply_buf; /* where to put the authorizer reply */
205 int auth_reply_buf_len;
206
207 struct mutex mutex;
208
209 /* out queue */
210 struct list_head out_queue;
211 struct list_head out_sent; /* sending or sent but unacked */
212 u64 out_seq; /* last message queued for send */
213
214 u64 in_seq, in_seq_acked; /* last message received, acked */
215
216 /* connection negotiation temps */
217 char in_banner[CEPH_BANNER_MAX_LEN];
218 struct ceph_msg_connect out_connect;
219 struct ceph_msg_connect_reply in_reply;
220 struct ceph_entity_addr actual_peer_addr;
221
222 /* message out temps */
223 struct ceph_msg_header out_hdr;
224 struct ceph_msg *out_msg; /* sending message (== tail of
225 out_sent) */
226 bool out_msg_done;
227
228 struct kvec out_kvec[8], /* sending header/footer data */
229 *out_kvec_cur;
230 int out_kvec_left; /* kvec's left in out_kvec */
231 int out_skip; /* skip this many bytes */
232 int out_kvec_bytes; /* total bytes left */
233 int out_more; /* there is more data after the kvecs */
234 __le64 out_temp_ack; /* for writing an ack */
235 struct ceph_timespec out_temp_keepalive2; /* for writing keepalive2
236 stamp */
237
238 /* message in temps */
239 struct ceph_msg_header in_hdr;
240 struct ceph_msg *in_msg;
241 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */
242
243 char in_tag; /* protocol control byte */
244 int in_base_pos; /* bytes read */
245 __le64 in_temp_ack; /* for reading an ack */
246
247 struct timespec last_keepalive_ack; /* keepalive2 ack stamp */
248
249 struct delayed_work work; /* send|recv work */
250 unsigned long delay; /* current delay interval */
251 };
252
253
254 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
255 extern int ceph_parse_ips(const char *c, const char *end,
256 struct ceph_entity_addr *addr,
257 int max_count, int *count);
258
259
260 extern int ceph_msgr_init(void);
261 extern void ceph_msgr_exit(void);
262 extern void ceph_msgr_flush(void);
263
264 extern void ceph_messenger_init(struct ceph_messenger *msgr,
265 struct ceph_entity_addr *myaddr);
266 extern void ceph_messenger_fini(struct ceph_messenger *msgr);
267
268 extern void ceph_con_init(struct ceph_connection *con, void *private,
269 const struct ceph_connection_operations *ops,
270 struct ceph_messenger *msgr);
271 extern void ceph_con_open(struct ceph_connection *con,
272 __u8 entity_type, __u64 entity_num,
273 struct ceph_entity_addr *addr);
274 extern bool ceph_con_opened(struct ceph_connection *con);
275 extern void ceph_con_close(struct ceph_connection *con);
276 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
277
278 extern void ceph_msg_revoke(struct ceph_msg *msg);
279 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
280
281 extern void ceph_con_keepalive(struct ceph_connection *con);
282 extern bool ceph_con_keepalive_expired(struct ceph_connection *con,
283 unsigned long interval);
284
285 extern void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
286 size_t length, size_t alignment);
287 extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
288 struct ceph_pagelist *pagelist);
289 #ifdef CONFIG_BLOCK
290 extern void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
291 size_t length);
292 #endif /* CONFIG_BLOCK */
293
294 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
295 bool can_fail);
296
297 extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg);
298 extern void ceph_msg_put(struct ceph_msg *msg);
299
300 extern void ceph_msg_dump(struct ceph_msg *msg);
301
302 #endif
303