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>
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;
56 * the global_seq counts connections i (attempt to) initiate
57 * in order to disambiguate certain connect race conditions.
60 spinlock_t global_seq_lock;
62 u32 supported_features;
63 u32 required_features;
67 * a single message. it contains a header (src, dest, message type, etc.),
68 * footer (crc values, mainly), a "front" message body, and possibly a
69 * data payload (stored in some number of pages).
72 struct ceph_msg_header hdr; /* header */
73 struct ceph_msg_footer footer; /* footer */
74 struct kvec front; /* unaligned blobs of message */
75 struct ceph_buffer *middle;
76 struct page **pages; /* data payload. NOT OWNER. */
77 unsigned nr_pages; /* size of page array */
78 unsigned page_alignment; /* io offset in first page */
79 struct ceph_pagelist *pagelist; /* instead of pages */
80 struct list_head list_head;
82 struct bio *bio; /* instead of pages/pagelist */
83 struct bio *bio_iter; /* bio iterator */
84 int bio_seg; /* current bio segment */
85 struct ceph_pagelist *trail; /* the trailing part of the data */
86 bool front_is_vmalloc;
90 unsigned long ack_stamp; /* tx: when we were acked */
92 struct ceph_msgpool *pool;
96 int page, page_pos; /* which page; offset in page */
97 int data_pos; /* offset in data payload */
98 bool did_page_crc; /* true if we've calculated crc for current page */
101 /* ceph connection fault delay defaults, for exponential backoff */
102 #define BASE_DELAY_INTERVAL (HZ/2)
103 #define MAX_DELAY_INTERVAL (5 * 60 * HZ)
106 * ceph_connection state bit flags
108 #define LOSSYTX 0 /* we can close channel or drop messages on errors */
110 #define NEGOTIATING 2
111 #define KEEPALIVE_PENDING 3
112 #define WRITE_PENDING 4 /* we have data ready to send */
113 #define STANDBY 8 /* no outgoing messages, socket closed. we keep
114 * the ceph_connection around to maintain shared
115 * state with the peer. */
116 #define CLOSED 10 /* we've closed the connection */
117 #define SOCK_CLOSED 11 /* socket state changed to closed */
118 #define OPENING 13 /* open connection w/ (possibly new) peer */
122 * A single connection with another host.
124 * We maintain a queue of outgoing messages, and some session state to
125 * ensure that we can preserve the lossless, ordered delivery of
126 * messages in the case of a TCP disconnect.
128 struct ceph_connection {
132 const struct ceph_connection_operations *ops;
134 struct ceph_messenger *msgr;
136 unsigned long state; /* connection state (see flags above) */
137 const char *error_msg; /* error message, if any */
139 struct ceph_entity_addr peer_addr; /* peer address */
140 struct ceph_entity_name peer_name; /* peer name */
141 struct ceph_entity_addr peer_addr_for_me;
142 unsigned peer_features;
143 u32 connect_seq; /* identify the most recent connection
144 attempt for this connection, client */
145 u32 peer_global_seq; /* peer's global seq for this connection */
147 int auth_retry; /* true if we need a newer authorizer */
148 void *auth_reply_buf; /* where to put the authorizer reply */
149 int auth_reply_buf_len;
154 struct list_head out_queue;
155 struct list_head out_sent; /* sending or sent but unacked */
156 u64 out_seq; /* last message queued for send */
158 u64 in_seq, in_seq_acked; /* last message received, acked */
160 /* connection negotiation temps */
161 char in_banner[CEPH_BANNER_MAX_LEN];
163 struct { /* outgoing connection */
164 struct ceph_msg_connect out_connect;
165 struct ceph_msg_connect_reply in_reply;
167 struct { /* incoming */
168 struct ceph_msg_connect in_connect;
169 struct ceph_msg_connect_reply out_reply;
172 struct ceph_entity_addr actual_peer_addr;
174 /* message out temps */
175 struct ceph_msg *out_msg; /* sending message (== tail of
178 struct ceph_msg_pos out_msg_pos;
180 struct kvec out_kvec[8], /* sending header/footer data */
182 int out_kvec_left; /* kvec's left in out_kvec */
183 int out_skip; /* skip this many bytes */
184 int out_kvec_bytes; /* total bytes left */
185 bool out_kvec_is_msg; /* kvec refers to out_msg */
186 int out_more; /* there is more data after the kvecs */
187 __le64 out_temp_ack; /* for writing an ack */
189 /* message in temps */
190 struct ceph_msg_header in_hdr;
191 struct ceph_msg *in_msg;
192 struct ceph_msg_pos in_msg_pos;
193 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */
195 char in_tag; /* protocol control byte */
196 int in_base_pos; /* bytes read */
197 __le64 in_temp_ack; /* for reading an ack */
199 struct delayed_work work; /* send|recv work */
200 unsigned long delay; /* current delay interval */
204 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
205 extern int ceph_parse_ips(const char *c, const char *end,
206 struct ceph_entity_addr *addr,
207 int max_count, int *count);
210 extern int ceph_msgr_init(void);
211 extern void ceph_msgr_exit(void);
212 extern void ceph_msgr_flush(void);
214 extern void ceph_messenger_init(struct ceph_messenger *msgr,
215 struct ceph_entity_addr *myaddr,
216 u32 supported_features,
217 u32 required_features,
220 extern void ceph_con_init(struct ceph_messenger *msgr,
221 struct ceph_connection *con);
222 extern void ceph_con_open(struct ceph_connection *con,
223 struct ceph_entity_addr *addr);
224 extern bool ceph_con_opened(struct ceph_connection *con);
225 extern void ceph_con_close(struct ceph_connection *con);
226 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
227 extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg);
228 extern void ceph_con_revoke_message(struct ceph_connection *con,
229 struct ceph_msg *msg);
230 extern void ceph_con_keepalive(struct ceph_connection *con);
231 extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
232 extern void ceph_con_put(struct ceph_connection *con);
234 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
236 extern void ceph_msg_kfree(struct ceph_msg *m);
239 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
241 kref_get(&msg->kref);
244 extern void ceph_msg_last_put(struct kref *kref);
245 static inline void ceph_msg_put(struct ceph_msg *msg)
247 kref_put(&msg->kref, ceph_msg_last_put);
250 extern void ceph_msg_dump(struct ceph_msg *msg);