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/workqueue.h> 10 11 #include <linux/ceph/types.h> 12 #include <linux/ceph/buffer.h> 13 14 struct ceph_msg; 15 struct ceph_connection; 16 17 /* 18 * Ceph defines these callbacks for handling connection events. 19 */ 20 struct ceph_connection_operations { 21 struct ceph_connection *(*get)(struct ceph_connection *); 22 void (*put)(struct ceph_connection *); 23 24 /* handle an incoming message. */ 25 void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m); 26 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); 33 34 /* there was some error on the socket (disconnect, whatever) */ 35 void (*fault) (struct ceph_connection *con); 36 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); 40 41 struct ceph_msg * (*alloc_msg) (struct ceph_connection *con, 42 struct ceph_msg_header *hdr, 43 int *skip); 44 }; 45 46 /* use format string %s%d */ 47 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num) 48 49 struct ceph_messenger { 50 struct ceph_entity_inst inst; /* my name+address */ 51 struct ceph_entity_addr my_enc_addr; 52 53 atomic_t stopping; 54 bool nocrc; 55 56 /* 57 * the global_seq counts connections i (attempt to) initiate 58 * in order to disambiguate certain connect race conditions. 59 */ 60 u32 global_seq; 61 spinlock_t global_seq_lock; 62 63 u32 supported_features; 64 u32 required_features; 65 }; 66 67 enum ceph_msg_data_type { 68 CEPH_MSG_DATA_NONE, /* message contains no data payload */ 69 CEPH_MSG_DATA_PAGES, /* data source/destination is a page array */ 70 CEPH_MSG_DATA_PAGELIST, /* data source/destination is a pagelist */ 71 #ifdef CONFIG_BLOCK 72 CEPH_MSG_DATA_BIO, /* data source/destination is a bio list */ 73 #endif /* CONFIG_BLOCK */ 74 }; 75 76 static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type) 77 { 78 switch (type) { 79 case CEPH_MSG_DATA_NONE: 80 case CEPH_MSG_DATA_PAGES: 81 case CEPH_MSG_DATA_PAGELIST: 82 #ifdef CONFIG_BLOCK 83 case CEPH_MSG_DATA_BIO: 84 #endif /* CONFIG_BLOCK */ 85 return true; 86 default: 87 return false; 88 } 89 } 90 91 struct ceph_msg_data { 92 struct list_head links; /* ceph_msg->data */ 93 enum ceph_msg_data_type type; 94 union { 95 #ifdef CONFIG_BLOCK 96 struct { 97 struct bio *bio; 98 size_t bio_length; 99 }; 100 #endif /* CONFIG_BLOCK */ 101 struct { 102 struct page **pages; /* NOT OWNER. */ 103 size_t length; /* total # bytes */ 104 unsigned int alignment; /* first page */ 105 }; 106 struct ceph_pagelist *pagelist; 107 }; 108 }; 109 110 struct ceph_msg_data_cursor { 111 size_t total_resid; /* across all data items */ 112 struct list_head *data_head; /* = &ceph_msg->data */ 113 114 struct ceph_msg_data *data; /* current data item */ 115 size_t resid; /* bytes not yet consumed */ 116 bool last_piece; /* current is last piece */ 117 bool need_crc; /* crc update needed */ 118 union { 119 #ifdef CONFIG_BLOCK 120 struct { /* bio */ 121 struct bio *bio; /* bio from list */ 122 unsigned int vector_index; /* vector from bio */ 123 unsigned int vector_offset; /* bytes from vector */ 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 front_is_vmalloc; 158 bool more_to_follow; 159 bool needs_out_seq; 160 int front_max; 161 unsigned long ack_stamp; /* tx: when we were acked */ 162 163 struct ceph_msgpool *pool; 164 }; 165 166 /* ceph connection fault delay defaults, for exponential backoff */ 167 #define BASE_DELAY_INTERVAL (HZ/2) 168 #define MAX_DELAY_INTERVAL (5 * 60 * HZ) 169 170 /* 171 * A single connection with another host. 172 * 173 * We maintain a queue of outgoing messages, and some session state to 174 * ensure that we can preserve the lossless, ordered delivery of 175 * messages in the case of a TCP disconnect. 176 */ 177 struct ceph_connection { 178 void *private; 179 180 const struct ceph_connection_operations *ops; 181 182 struct ceph_messenger *msgr; 183 184 atomic_t sock_state; 185 struct socket *sock; 186 struct ceph_entity_addr peer_addr; /* peer address */ 187 struct ceph_entity_addr peer_addr_for_me; 188 189 unsigned long flags; 190 unsigned long state; 191 const char *error_msg; /* error message, if any */ 192 193 struct ceph_entity_name peer_name; /* peer name */ 194 195 unsigned peer_features; 196 u32 connect_seq; /* identify the most recent connection 197 attempt for this connection, client */ 198 u32 peer_global_seq; /* peer's global seq for this connection */ 199 200 int auth_retry; /* true if we need a newer authorizer */ 201 void *auth_reply_buf; /* where to put the authorizer reply */ 202 int auth_reply_buf_len; 203 204 struct mutex mutex; 205 206 /* out queue */ 207 struct list_head out_queue; 208 struct list_head out_sent; /* sending or sent but unacked */ 209 u64 out_seq; /* last message queued for send */ 210 211 u64 in_seq, in_seq_acked; /* last message received, acked */ 212 213 /* connection negotiation temps */ 214 char in_banner[CEPH_BANNER_MAX_LEN]; 215 struct ceph_msg_connect out_connect; 216 struct ceph_msg_connect_reply in_reply; 217 struct ceph_entity_addr actual_peer_addr; 218 219 /* message out temps */ 220 struct ceph_msg *out_msg; /* sending message (== tail of 221 out_sent) */ 222 bool out_msg_done; 223 224 struct kvec out_kvec[8], /* sending header/footer data */ 225 *out_kvec_cur; 226 int out_kvec_left; /* kvec's left in out_kvec */ 227 int out_skip; /* skip this many bytes */ 228 int out_kvec_bytes; /* total bytes left */ 229 bool out_kvec_is_msg; /* kvec refers to out_msg */ 230 int out_more; /* there is more data after the kvecs */ 231 __le64 out_temp_ack; /* for writing an ack */ 232 233 /* message in temps */ 234 struct ceph_msg_header in_hdr; 235 struct ceph_msg *in_msg; 236 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */ 237 238 char in_tag; /* protocol control byte */ 239 int in_base_pos; /* bytes read */ 240 __le64 in_temp_ack; /* for reading an ack */ 241 242 struct delayed_work work; /* send|recv work */ 243 unsigned long delay; /* current delay interval */ 244 }; 245 246 247 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss); 248 extern int ceph_parse_ips(const char *c, const char *end, 249 struct ceph_entity_addr *addr, 250 int max_count, int *count); 251 252 253 extern int ceph_msgr_init(void); 254 extern void ceph_msgr_exit(void); 255 extern void ceph_msgr_flush(void); 256 257 extern void ceph_messenger_init(struct ceph_messenger *msgr, 258 struct ceph_entity_addr *myaddr, 259 u32 supported_features, 260 u32 required_features, 261 bool nocrc); 262 263 extern void ceph_con_init(struct ceph_connection *con, void *private, 264 const struct ceph_connection_operations *ops, 265 struct ceph_messenger *msgr); 266 extern void ceph_con_open(struct ceph_connection *con, 267 __u8 entity_type, __u64 entity_num, 268 struct ceph_entity_addr *addr); 269 extern bool ceph_con_opened(struct ceph_connection *con); 270 extern void ceph_con_close(struct ceph_connection *con); 271 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg); 272 273 extern void ceph_msg_revoke(struct ceph_msg *msg); 274 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg); 275 276 extern void ceph_con_keepalive(struct ceph_connection *con); 277 278 extern void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, 279 size_t length, size_t alignment); 280 extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg, 281 struct ceph_pagelist *pagelist); 282 #ifdef CONFIG_BLOCK 283 extern void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio, 284 size_t length); 285 #endif /* CONFIG_BLOCK */ 286 287 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, 288 bool can_fail); 289 extern void ceph_msg_kfree(struct ceph_msg *m); 290 291 292 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) 293 { 294 kref_get(&msg->kref); 295 return msg; 296 } 297 extern void ceph_msg_last_put(struct kref *kref); 298 static inline void ceph_msg_put(struct ceph_msg *msg) 299 { 300 kref_put(&msg->kref, ceph_msg_last_put); 301 } 302 303 extern void ceph_msg_dump(struct ceph_msg *msg); 304 305 #endif 306