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 12 #include <linux/ceph/types.h> 13 #include <linux/ceph/buffer.h> 14 15 struct ceph_msg; 16 struct ceph_connection; 17 18 /* 19 * Ceph defines these callbacks for handling connection events. 20 */ 21 struct ceph_connection_operations { 22 struct ceph_connection *(*get)(struct ceph_connection *); 23 void (*put)(struct ceph_connection *); 24 25 /* handle an incoming message. */ 26 void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m); 27 28 /* authorize an outgoing connection */ 29 struct ceph_auth_handshake *(*get_authorizer) ( 30 struct ceph_connection *con, 31 int *proto, int force_new); 32 int (*verify_authorizer_reply) (struct ceph_connection *con, int len); 33 int (*invalidate_authorizer)(struct ceph_connection *con); 34 35 /* there was some error on the socket (disconnect, whatever) */ 36 void (*fault) (struct ceph_connection *con); 37 38 /* a remote host as terminated a message exchange session, and messages 39 * we sent (or they tried to send us) may be lost. */ 40 void (*peer_reset) (struct ceph_connection *con); 41 42 struct ceph_msg * (*alloc_msg) (struct ceph_connection *con, 43 struct ceph_msg_header *hdr, 44 int *skip); 45 }; 46 47 /* use format string %s%d */ 48 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num) 49 50 struct ceph_messenger { 51 struct ceph_entity_inst inst; /* my name+address */ 52 struct ceph_entity_addr my_enc_addr; 53 54 atomic_t stopping; 55 bool nocrc; 56 57 /* 58 * the global_seq counts connections i (attempt to) initiate 59 * in order to disambiguate certain connect race conditions. 60 */ 61 u32 global_seq; 62 spinlock_t global_seq_lock; 63 64 u64 supported_features; 65 u64 required_features; 66 }; 67 68 enum ceph_msg_data_type { 69 CEPH_MSG_DATA_NONE, /* message contains no data payload */ 70 CEPH_MSG_DATA_PAGES, /* data source/destination is a page array */ 71 CEPH_MSG_DATA_PAGELIST, /* data source/destination is a pagelist */ 72 #ifdef CONFIG_BLOCK 73 CEPH_MSG_DATA_BIO, /* data source/destination is a bio list */ 74 #endif /* CONFIG_BLOCK */ 75 }; 76 77 static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type) 78 { 79 switch (type) { 80 case CEPH_MSG_DATA_NONE: 81 case CEPH_MSG_DATA_PAGES: 82 case CEPH_MSG_DATA_PAGELIST: 83 #ifdef CONFIG_BLOCK 84 case CEPH_MSG_DATA_BIO: 85 #endif /* CONFIG_BLOCK */ 86 return true; 87 default: 88 return false; 89 } 90 } 91 92 struct ceph_msg_data { 93 struct list_head links; /* ceph_msg->data */ 94 enum ceph_msg_data_type type; 95 union { 96 #ifdef CONFIG_BLOCK 97 struct { 98 struct bio *bio; 99 size_t bio_length; 100 }; 101 #endif /* CONFIG_BLOCK */ 102 struct { 103 struct page **pages; /* NOT OWNER. */ 104 size_t length; /* total # bytes */ 105 unsigned int alignment; /* first page */ 106 }; 107 struct ceph_pagelist *pagelist; 108 }; 109 }; 110 111 struct ceph_msg_data_cursor { 112 size_t total_resid; /* across all data items */ 113 struct list_head *data_head; /* = &ceph_msg->data */ 114 115 struct ceph_msg_data *data; /* current data item */ 116 size_t resid; /* bytes not yet consumed */ 117 bool last_piece; /* current is last piece */ 118 bool need_crc; /* crc update needed */ 119 union { 120 #ifdef CONFIG_BLOCK 121 struct { /* bio */ 122 struct bio *bio; /* bio from list */ 123 struct bvec_iter bvec_iter; 124 }; 125 #endif /* CONFIG_BLOCK */ 126 struct { /* pages */ 127 unsigned int page_offset; /* offset in page */ 128 unsigned short page_index; /* index in array */ 129 unsigned short page_count; /* pages in array */ 130 }; 131 struct { /* pagelist */ 132 struct page *page; /* page from list */ 133 size_t offset; /* bytes from list */ 134 }; 135 }; 136 }; 137 138 /* 139 * a single message. it contains a header (src, dest, message type, etc.), 140 * footer (crc values, mainly), a "front" message body, and possibly a 141 * data payload (stored in some number of pages). 142 */ 143 struct ceph_msg { 144 struct ceph_msg_header hdr; /* header */ 145 struct ceph_msg_footer footer; /* footer */ 146 struct kvec front; /* unaligned blobs of message */ 147 struct ceph_buffer *middle; 148 149 size_t data_length; 150 struct list_head data; 151 struct ceph_msg_data_cursor cursor; 152 153 struct ceph_connection *con; 154 struct list_head list_head; /* links for connection lists */ 155 156 struct kref kref; 157 bool more_to_follow; 158 bool needs_out_seq; 159 int front_alloc_len; 160 unsigned long ack_stamp; /* tx: when we were acked */ 161 162 struct ceph_msgpool *pool; 163 }; 164 165 /* ceph connection fault delay defaults, for exponential backoff */ 166 #define BASE_DELAY_INTERVAL (HZ/2) 167 #define MAX_DELAY_INTERVAL (5 * 60 * HZ) 168 169 /* 170 * A single connection with another host. 171 * 172 * We maintain a queue of outgoing messages, and some session state to 173 * ensure that we can preserve the lossless, ordered delivery of 174 * messages in the case of a TCP disconnect. 175 */ 176 struct ceph_connection { 177 void *private; 178 179 const struct ceph_connection_operations *ops; 180 181 struct ceph_messenger *msgr; 182 183 atomic_t sock_state; 184 struct socket *sock; 185 struct ceph_entity_addr peer_addr; /* peer address */ 186 struct ceph_entity_addr peer_addr_for_me; 187 188 unsigned long flags; 189 unsigned long state; 190 const char *error_msg; /* error message, if any */ 191 192 struct ceph_entity_name peer_name; /* peer name */ 193 194 u64 peer_features; 195 u32 connect_seq; /* identify the most recent connection 196 attempt for this connection, client */ 197 u32 peer_global_seq; /* peer's global seq for this connection */ 198 199 int auth_retry; /* true if we need a newer authorizer */ 200 void *auth_reply_buf; /* where to put the authorizer reply */ 201 int auth_reply_buf_len; 202 203 struct mutex mutex; 204 205 /* out queue */ 206 struct list_head out_queue; 207 struct list_head out_sent; /* sending or sent but unacked */ 208 u64 out_seq; /* last message queued for send */ 209 210 u64 in_seq, in_seq_acked; /* last message received, acked */ 211 212 /* connection negotiation temps */ 213 char in_banner[CEPH_BANNER_MAX_LEN]; 214 struct ceph_msg_connect out_connect; 215 struct ceph_msg_connect_reply in_reply; 216 struct ceph_entity_addr actual_peer_addr; 217 218 /* message out temps */ 219 struct ceph_msg *out_msg; /* sending message (== tail of 220 out_sent) */ 221 bool out_msg_done; 222 223 struct kvec out_kvec[8], /* sending header/footer data */ 224 *out_kvec_cur; 225 int out_kvec_left; /* kvec's left in out_kvec */ 226 int out_skip; /* skip this many bytes */ 227 int out_kvec_bytes; /* total bytes left */ 228 bool out_kvec_is_msg; /* kvec refers to out_msg */ 229 int out_more; /* there is more data after the kvecs */ 230 __le64 out_temp_ack; /* for writing an ack */ 231 232 /* message in temps */ 233 struct ceph_msg_header in_hdr; 234 struct ceph_msg *in_msg; 235 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */ 236 237 char in_tag; /* protocol control byte */ 238 int in_base_pos; /* bytes read */ 239 __le64 in_temp_ack; /* for reading an ack */ 240 241 struct delayed_work work; /* send|recv work */ 242 unsigned long delay; /* current delay interval */ 243 }; 244 245 246 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss); 247 extern int ceph_parse_ips(const char *c, const char *end, 248 struct ceph_entity_addr *addr, 249 int max_count, int *count); 250 251 252 extern int ceph_msgr_init(void); 253 extern void ceph_msgr_exit(void); 254 extern void ceph_msgr_flush(void); 255 256 extern void ceph_messenger_init(struct ceph_messenger *msgr, 257 struct ceph_entity_addr *myaddr, 258 u64 supported_features, 259 u64 required_features, 260 bool nocrc); 261 262 extern void ceph_con_init(struct ceph_connection *con, void *private, 263 const struct ceph_connection_operations *ops, 264 struct ceph_messenger *msgr); 265 extern void ceph_con_open(struct ceph_connection *con, 266 __u8 entity_type, __u64 entity_num, 267 struct ceph_entity_addr *addr); 268 extern bool ceph_con_opened(struct ceph_connection *con); 269 extern void ceph_con_close(struct ceph_connection *con); 270 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg); 271 272 extern void ceph_msg_revoke(struct ceph_msg *msg); 273 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg); 274 275 extern void ceph_con_keepalive(struct ceph_connection *con); 276 277 extern void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, 278 size_t length, size_t alignment); 279 extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg, 280 struct ceph_pagelist *pagelist); 281 #ifdef CONFIG_BLOCK 282 extern void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio, 283 size_t length); 284 #endif /* CONFIG_BLOCK */ 285 286 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, 287 bool can_fail); 288 extern void ceph_msg_kfree(struct ceph_msg *m); 289 290 291 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) 292 { 293 kref_get(&msg->kref); 294 return msg; 295 } 296 extern void ceph_msg_last_put(struct kref *kref); 297 static inline void ceph_msg_put(struct ceph_msg *msg) 298 { 299 kref_put(&msg->kref, ceph_msg_last_put); 300 } 301 302 extern void ceph_msg_dump(struct ceph_msg *msg); 303 304 #endif 305