1 #ifndef __FS_CEPH_MESSENGER_H
2 #define __FS_CEPH_MESSENGER_H
3 
4 #include <linux/kref.h>
5 #include <linux/mutex.h>
6 #include <linux/net.h>
7 #include <linux/radix-tree.h>
8 #include <linux/uio.h>
9 #include <linux/version.h>
10 #include <linux/workqueue.h>
11 
12 #include "types.h"
13 #include "buffer.h"
14 
15 struct ceph_msg;
16 struct ceph_connection;
17 
18 extern struct workqueue_struct *ceph_msgr_wq;       /* receive work queue */
19 
20 /*
21  * Ceph defines these callbacks for handling connection events.
22  */
23 struct ceph_connection_operations {
24 	struct ceph_connection *(*get)(struct ceph_connection *);
25 	void (*put)(struct ceph_connection *);
26 
27 	/* handle an incoming message. */
28 	void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
29 
30 	/* authorize an outgoing connection */
31 	int (*get_authorizer) (struct ceph_connection *con,
32 			       void **buf, int *len, int *proto,
33 			       void **reply_buf, int *reply_len, int force_new);
34 	int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
35 	int (*invalidate_authorizer)(struct ceph_connection *con);
36 
37 	/* protocol version mismatch */
38 	void (*bad_proto) (struct ceph_connection *con);
39 
40 	/* there was some error on the socket (disconnect, whatever) */
41 	void (*fault) (struct ceph_connection *con);
42 
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);
46 
47 	struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
48 					struct ceph_msg_header *hdr,
49 					int *skip);
50 };
51 
52 /* use format string %s%d */
53 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
54 
55 struct ceph_messenger {
56 	struct ceph_entity_inst inst;    /* my name+address */
57 	struct ceph_entity_addr my_enc_addr;
58 	struct page *zero_page;          /* used in certain error cases */
59 
60 	bool nocrc;
61 
62 	/*
63 	 * the global_seq counts connections i (attempt to) initiate
64 	 * in order to disambiguate certain connect race conditions.
65 	 */
66 	u32 global_seq;
67 	spinlock_t global_seq_lock;
68 
69 	u32 supported_features;
70 	u32 required_features;
71 };
72 
73 /*
74  * a single message.  it contains a header (src, dest, message type, etc.),
75  * footer (crc values, mainly), a "front" message body, and possibly a
76  * data payload (stored in some number of pages).
77  */
78 struct ceph_msg {
79 	struct ceph_msg_header hdr;	/* header */
80 	struct ceph_msg_footer footer;	/* footer */
81 	struct kvec front;              /* unaligned blobs of message */
82 	struct ceph_buffer *middle;
83 	struct page **pages;            /* data payload.  NOT OWNER. */
84 	unsigned nr_pages;              /* size of page array */
85 	unsigned page_alignment;        /* io offset in first page */
86 	struct ceph_pagelist *pagelist; /* instead of pages */
87 	struct list_head list_head;
88 	struct kref kref;
89 	struct bio  *bio;		/* instead of pages/pagelist */
90 	struct bio  *bio_iter;		/* bio iterator */
91 	int bio_seg;			/* current bio segment */
92 	struct ceph_pagelist *trail;	/* the trailing part of the data */
93 	bool front_is_vmalloc;
94 	bool more_to_follow;
95 	bool needs_out_seq;
96 	int front_max;
97 
98 	struct ceph_msgpool *pool;
99 };
100 
101 struct ceph_msg_pos {
102 	int page, page_pos;  /* which page; offset in page */
103 	int data_pos;        /* offset in data payload */
104 	int did_page_crc;    /* true if we've calculated crc for current page */
105 };
106 
107 /* ceph connection fault delay defaults, for exponential backoff */
108 #define BASE_DELAY_INTERVAL	(HZ/2)
109 #define MAX_DELAY_INTERVAL	(5 * 60 * HZ)
110 
111 /*
112  * ceph_connection state bit flags
113  */
114 #define LOSSYTX         0  /* we can close channel or drop messages on errors */
115 #define CONNECTING	1
116 #define NEGOTIATING	2
117 #define KEEPALIVE_PENDING      3
118 #define WRITE_PENDING	4  /* we have data ready to send */
119 #define STANDBY		8  /* no outgoing messages, socket closed.  we keep
120 			    * the ceph_connection around to maintain shared
121 			    * state with the peer. */
122 #define CLOSED		10 /* we've closed the connection */
123 #define SOCK_CLOSED	11 /* socket state changed to closed */
124 #define OPENING         13 /* open connection w/ (possibly new) peer */
125 #define DEAD            14 /* dead, about to kfree */
126 #define BACKOFF         15
127 
128 /*
129  * A single connection with another host.
130  *
131  * We maintain a queue of outgoing messages, and some session state to
132  * ensure that we can preserve the lossless, ordered delivery of
133  * messages in the case of a TCP disconnect.
134  */
135 struct ceph_connection {
136 	void *private;
137 	atomic_t nref;
138 
139 	const struct ceph_connection_operations *ops;
140 
141 	struct ceph_messenger *msgr;
142 	struct socket *sock;
143 	unsigned long state;	/* connection state (see flags above) */
144 	const char *error_msg;  /* error message, if any */
145 
146 	struct ceph_entity_addr peer_addr; /* peer address */
147 	struct ceph_entity_name peer_name; /* peer name */
148 	struct ceph_entity_addr peer_addr_for_me;
149 	unsigned peer_features;
150 	u32 connect_seq;      /* identify the most recent connection
151 				 attempt for this connection, client */
152 	u32 peer_global_seq;  /* peer's global seq for this connection */
153 
154 	int auth_retry;       /* true if we need a newer authorizer */
155 	void *auth_reply_buf;   /* where to put the authorizer reply */
156 	int auth_reply_buf_len;
157 
158 	struct mutex mutex;
159 
160 	/* out queue */
161 	struct list_head out_queue;
162 	struct list_head out_sent;   /* sending or sent but unacked */
163 	u64 out_seq;		     /* last message queued for send */
164 
165 	u64 in_seq, in_seq_acked;  /* last message received, acked */
166 
167 	/* connection negotiation temps */
168 	char in_banner[CEPH_BANNER_MAX_LEN];
169 	union {
170 		struct {  /* outgoing connection */
171 			struct ceph_msg_connect out_connect;
172 			struct ceph_msg_connect_reply in_reply;
173 		};
174 		struct {  /* incoming */
175 			struct ceph_msg_connect in_connect;
176 			struct ceph_msg_connect_reply out_reply;
177 		};
178 	};
179 	struct ceph_entity_addr actual_peer_addr;
180 
181 	/* message out temps */
182 	struct ceph_msg *out_msg;        /* sending message (== tail of
183 					    out_sent) */
184 	bool out_msg_done;
185 	struct ceph_msg_pos out_msg_pos;
186 
187 	struct kvec out_kvec[8],         /* sending header/footer data */
188 		*out_kvec_cur;
189 	int out_kvec_left;   /* kvec's left in out_kvec */
190 	int out_skip;        /* skip this many bytes */
191 	int out_kvec_bytes;  /* total bytes left */
192 	bool out_kvec_is_msg; /* kvec refers to out_msg */
193 	int out_more;        /* there is more data after the kvecs */
194 	__le64 out_temp_ack; /* for writing an ack */
195 
196 	/* message in temps */
197 	struct ceph_msg_header in_hdr;
198 	struct ceph_msg *in_msg;
199 	struct ceph_msg_pos in_msg_pos;
200 	u32 in_front_crc, in_middle_crc, in_data_crc;  /* calculated crc */
201 
202 	char in_tag;         /* protocol control byte */
203 	int in_base_pos;     /* bytes read */
204 	__le64 in_temp_ack;  /* for reading an ack */
205 
206 	struct delayed_work work;	    /* send|recv work */
207 	unsigned long       delay;          /* current delay interval */
208 };
209 
210 
211 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
212 extern int ceph_parse_ips(const char *c, const char *end,
213 			  struct ceph_entity_addr *addr,
214 			  int max_count, int *count);
215 
216 
217 extern int ceph_msgr_init(void);
218 extern void ceph_msgr_exit(void);
219 extern void ceph_msgr_flush(void);
220 
221 extern struct ceph_messenger *ceph_messenger_create(
222 	struct ceph_entity_addr *myaddr,
223 	u32 features, u32 required);
224 extern void ceph_messenger_destroy(struct ceph_messenger *);
225 
226 extern void ceph_con_init(struct ceph_messenger *msgr,
227 			  struct ceph_connection *con);
228 extern void ceph_con_open(struct ceph_connection *con,
229 			  struct ceph_entity_addr *addr);
230 extern bool ceph_con_opened(struct ceph_connection *con);
231 extern void ceph_con_close(struct ceph_connection *con);
232 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
233 extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg);
234 extern void ceph_con_revoke_message(struct ceph_connection *con,
235 				  struct ceph_msg *msg);
236 extern void ceph_con_keepalive(struct ceph_connection *con);
237 extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
238 extern void ceph_con_put(struct ceph_connection *con);
239 
240 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags);
241 extern void ceph_msg_kfree(struct ceph_msg *m);
242 
243 
ceph_msg_get(struct ceph_msg * msg)244 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
245 {
246 	kref_get(&msg->kref);
247 	return msg;
248 }
249 extern void ceph_msg_last_put(struct kref *kref);
ceph_msg_put(struct ceph_msg * msg)250 static inline void ceph_msg_put(struct ceph_msg *msg)
251 {
252 	kref_put(&msg->kref, ceph_msg_last_put);
253 }
254 
255 extern void ceph_msg_dump(struct ceph_msg *msg);
256 
257 #endif
258