1 #ifndef __FS_CEPH_MESSENGER_H
2 #define __FS_CEPH_MESSENGER_H
4 #include <linux/kref.h>
5 #include <linux/mutex.h>
7 #include <linux/radix-tree.h>
9 #include <linux/workqueue.h>
11 #include <linux/ceph/types.h>
12 #include <linux/ceph/buffer.h>
15 struct ceph_connection;
18 * Ceph defines these callbacks for handling connection events.
20 struct ceph_connection_operations {
21 struct ceph_connection *(*get)(struct ceph_connection *);
22 void (*put)(struct ceph_connection *);
24 /* handle an incoming message. */
25 void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
27 /* authorize an outgoing connection */
28 struct ceph_auth_handshake *(*get_authorizer) (
29 struct ceph_connection *con,
30 int *proto, int force_new);
31 int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
32 int (*invalidate_authorizer)(struct ceph_connection *con);
34 /* there was some error on the socket (disconnect, whatever) */
35 void (*fault) (struct ceph_connection *con);
37 /* a remote host as terminated a message exchange session, and messages
38 * we sent (or they tried to send us) may be lost. */
39 void (*peer_reset) (struct ceph_connection *con);
41 struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
42 struct ceph_msg_header *hdr,
46 /* use format string %s%d */
47 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
49 struct ceph_messenger {
50 struct ceph_entity_inst inst; /* my name+address */
51 struct ceph_entity_addr my_enc_addr;
57 * the global_seq counts connections i (attempt to) initiate
58 * in order to disambiguate certain connect race conditions.
61 spinlock_t global_seq_lock;
63 u32 supported_features;
64 u32 required_features;
68 * a single message. it contains a header (src, dest, message type, etc.),
69 * footer (crc values, mainly), a "front" message body, and possibly a
70 * data payload (stored in some number of pages).
73 struct ceph_msg_header hdr; /* header */
74 struct ceph_msg_footer footer; /* footer */
75 struct kvec front; /* unaligned blobs of message */
76 struct ceph_buffer *middle;
77 struct page **pages; /* data payload. NOT OWNER. */
78 unsigned nr_pages; /* size of page array */
79 unsigned page_alignment; /* io offset in first page */
80 struct ceph_pagelist *pagelist; /* instead of pages */
82 struct ceph_connection *con;
83 struct list_head list_head;
87 struct bio *bio; /* instead of pages/pagelist */
88 struct bio *bio_iter; /* bio iterator */
89 int bio_seg; /* current bio segment */
90 #endif /* CONFIG_BLOCK */
91 struct ceph_pagelist *trail; /* the trailing part of the data */
92 bool front_is_vmalloc;
96 unsigned long ack_stamp; /* tx: when we were acked */
98 struct ceph_msgpool *pool;
101 struct ceph_msg_pos {
102 int page, page_pos; /* which page; offset in page */
103 int data_pos; /* offset in data payload */
104 bool did_page_crc; /* true if we've calculated crc for current page */
107 /* ceph connection fault delay defaults, for exponential backoff */
108 #define BASE_DELAY_INTERVAL (HZ/2)
109 #define MAX_DELAY_INTERVAL (5 * 60 * HZ)
112 * A single connection with another host.
114 * We maintain a queue of outgoing messages, and some session state to
115 * ensure that we can preserve the lossless, ordered delivery of
116 * messages in the case of a TCP disconnect.
118 struct ceph_connection {
121 const struct ceph_connection_operations *ops;
123 struct ceph_messenger *msgr;
127 struct ceph_entity_addr peer_addr; /* peer address */
128 struct ceph_entity_addr peer_addr_for_me;
132 const char *error_msg; /* error message, if any */
134 struct ceph_entity_name peer_name; /* peer name */
136 unsigned peer_features;
137 u32 connect_seq; /* identify the most recent connection
138 attempt for this connection, client */
139 u32 peer_global_seq; /* peer's global seq for this connection */
141 int auth_retry; /* true if we need a newer authorizer */
142 void *auth_reply_buf; /* where to put the authorizer reply */
143 int auth_reply_buf_len;
148 struct list_head out_queue;
149 struct list_head out_sent; /* sending or sent but unacked */
150 u64 out_seq; /* last message queued for send */
152 u64 in_seq, in_seq_acked; /* last message received, acked */
154 /* connection negotiation temps */
155 char in_banner[CEPH_BANNER_MAX_LEN];
156 struct ceph_msg_connect out_connect;
157 struct ceph_msg_connect_reply in_reply;
158 struct ceph_entity_addr actual_peer_addr;
160 /* message out temps */
161 struct ceph_msg *out_msg; /* sending message (== tail of
164 struct ceph_msg_pos out_msg_pos;
166 struct kvec out_kvec[8], /* sending header/footer data */
168 int out_kvec_left; /* kvec's left in out_kvec */
169 int out_skip; /* skip this many bytes */
170 int out_kvec_bytes; /* total bytes left */
171 bool out_kvec_is_msg; /* kvec refers to out_msg */
172 int out_more; /* there is more data after the kvecs */
173 __le64 out_temp_ack; /* for writing an ack */
175 /* message in temps */
176 struct ceph_msg_header in_hdr;
177 struct ceph_msg *in_msg;
178 struct ceph_msg_pos in_msg_pos;
179 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */
181 char in_tag; /* protocol control byte */
182 int in_base_pos; /* bytes read */
183 __le64 in_temp_ack; /* for reading an ack */
185 struct delayed_work work; /* send|recv work */
186 unsigned long delay; /* current delay interval */
190 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
191 extern int ceph_parse_ips(const char *c, const char *end,
192 struct ceph_entity_addr *addr,
193 int max_count, int *count);
196 extern int ceph_msgr_init(void);
197 extern void ceph_msgr_exit(void);
198 extern void ceph_msgr_flush(void);
200 extern void ceph_messenger_init(struct ceph_messenger *msgr,
201 struct ceph_entity_addr *myaddr,
202 u32 supported_features,
203 u32 required_features,
206 extern void ceph_con_init(struct ceph_connection *con, void *private,
207 const struct ceph_connection_operations *ops,
208 struct ceph_messenger *msgr);
209 extern void ceph_con_open(struct ceph_connection *con,
210 __u8 entity_type, __u64 entity_num,
211 struct ceph_entity_addr *addr);
212 extern bool ceph_con_opened(struct ceph_connection *con);
213 extern void ceph_con_close(struct ceph_connection *con);
214 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
216 extern void ceph_msg_revoke(struct ceph_msg *msg);
217 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
219 extern void ceph_con_keepalive(struct ceph_connection *con);
221 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
223 extern void ceph_msg_kfree(struct ceph_msg *m);
226 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
228 kref_get(&msg->kref);
231 extern void ceph_msg_last_put(struct kref *kref);
232 static inline void ceph_msg_put(struct ceph_msg *msg)
234 kref_put(&msg->kref, ceph_msg_last_put);
237 extern void ceph_msg_dump(struct ceph_msg *msg);