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 "types.h" 12 #include "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 /* protocol version mismatch */ 35 void (*bad_proto) (struct ceph_connection *con); 36 37 /* there was some error on the socket (disconnect, whatever) */ 38 void (*fault) (struct ceph_connection *con); 39 40 /* a remote host as terminated a message exchange session, and messages 41 * we sent (or they tried to send us) may be lost. */ 42 void (*peer_reset) (struct ceph_connection *con); 43 44 struct ceph_msg * (*alloc_msg) (struct ceph_connection *con, 45 struct ceph_msg_header *hdr, 46 int *skip); 47 }; 48 49 /* use format string %s%d */ 50 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num) 51 52 struct ceph_messenger { 53 struct ceph_entity_inst inst; /* my name+address */ 54 struct ceph_entity_addr my_enc_addr; 55 56 bool nocrc; 57 58 /* 59 * the global_seq counts connections i (attempt to) initiate 60 * in order to disambiguate certain connect race conditions. 61 */ 62 u32 global_seq; 63 spinlock_t global_seq_lock; 64 65 u32 supported_features; 66 u32 required_features; 67 }; 68 69 /* 70 * a single message. it contains a header (src, dest, message type, etc.), 71 * footer (crc values, mainly), a "front" message body, and possibly a 72 * data payload (stored in some number of pages). 73 */ 74 struct ceph_msg { 75 struct ceph_msg_header hdr; /* header */ 76 struct ceph_msg_footer footer; /* footer */ 77 struct kvec front; /* unaligned blobs of message */ 78 struct ceph_buffer *middle; 79 struct page **pages; /* data payload. NOT OWNER. */ 80 unsigned nr_pages; /* size of page array */ 81 unsigned page_alignment; /* io offset in first page */ 82 struct ceph_pagelist *pagelist; /* instead of pages */ 83 struct list_head list_head; 84 struct kref kref; 85 struct bio *bio; /* instead of pages/pagelist */ 86 struct bio *bio_iter; /* bio iterator */ 87 int bio_seg; /* current bio segment */ 88 struct ceph_pagelist *trail; /* the trailing part of the data */ 89 bool front_is_vmalloc; 90 bool more_to_follow; 91 bool needs_out_seq; 92 int front_max; 93 unsigned long ack_stamp; /* tx: when we were acked */ 94 95 struct ceph_msgpool *pool; 96 }; 97 98 struct ceph_msg_pos { 99 int page, page_pos; /* which page; offset in page */ 100 int data_pos; /* offset in data payload */ 101 bool did_page_crc; /* true if we've calculated crc for current page */ 102 }; 103 104 /* ceph connection fault delay defaults, for exponential backoff */ 105 #define BASE_DELAY_INTERVAL (HZ/2) 106 #define MAX_DELAY_INTERVAL (5 * 60 * HZ) 107 108 /* 109 * ceph_connection state bit flags 110 */ 111 #define LOSSYTX 0 /* we can close channel or drop messages on errors */ 112 #define CONNECTING 1 113 #define NEGOTIATING 2 114 #define KEEPALIVE_PENDING 3 115 #define WRITE_PENDING 4 /* we have data ready to send */ 116 #define STANDBY 8 /* no outgoing messages, socket closed. we keep 117 * the ceph_connection around to maintain shared 118 * state with the peer. */ 119 #define CLOSED 10 /* we've closed the connection */ 120 #define SOCK_CLOSED 11 /* socket state changed to closed */ 121 #define OPENING 13 /* open connection w/ (possibly new) peer */ 122 #define DEAD 14 /* dead, about to kfree */ 123 #define BACKOFF 15 124 125 /* 126 * A single connection with another host. 127 * 128 * We maintain a queue of outgoing messages, and some session state to 129 * ensure that we can preserve the lossless, ordered delivery of 130 * messages in the case of a TCP disconnect. 131 */ 132 struct ceph_connection { 133 void *private; 134 atomic_t nref; 135 136 const struct ceph_connection_operations *ops; 137 138 struct ceph_messenger *msgr; 139 struct socket *sock; 140 unsigned long state; /* connection state (see flags above) */ 141 const char *error_msg; /* error message, if any */ 142 143 struct ceph_entity_addr peer_addr; /* peer address */ 144 struct ceph_entity_name peer_name; /* peer name */ 145 struct ceph_entity_addr peer_addr_for_me; 146 unsigned peer_features; 147 u32 connect_seq; /* identify the most recent connection 148 attempt for this connection, client */ 149 u32 peer_global_seq; /* peer's global seq for this connection */ 150 151 int auth_retry; /* true if we need a newer authorizer */ 152 void *auth_reply_buf; /* where to put the authorizer reply */ 153 int auth_reply_buf_len; 154 155 struct mutex mutex; 156 157 /* out queue */ 158 struct list_head out_queue; 159 struct list_head out_sent; /* sending or sent but unacked */ 160 u64 out_seq; /* last message queued for send */ 161 162 u64 in_seq, in_seq_acked; /* last message received, acked */ 163 164 /* connection negotiation temps */ 165 char in_banner[CEPH_BANNER_MAX_LEN]; 166 struct ceph_msg_connect out_connect; 167 struct ceph_msg_connect_reply in_reply; 168 struct ceph_entity_addr actual_peer_addr; 169 170 /* message out temps */ 171 struct ceph_msg *out_msg; /* sending message (== tail of 172 out_sent) */ 173 bool out_msg_done; 174 struct ceph_msg_pos out_msg_pos; 175 176 struct kvec out_kvec[8], /* sending header/footer data */ 177 *out_kvec_cur; 178 int out_kvec_left; /* kvec's left in out_kvec */ 179 int out_skip; /* skip this many bytes */ 180 int out_kvec_bytes; /* total bytes left */ 181 bool out_kvec_is_msg; /* kvec refers to out_msg */ 182 int out_more; /* there is more data after the kvecs */ 183 __le64 out_temp_ack; /* for writing an ack */ 184 185 /* message in temps */ 186 struct ceph_msg_header in_hdr; 187 struct ceph_msg *in_msg; 188 struct ceph_msg_pos in_msg_pos; 189 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */ 190 191 char in_tag; /* protocol control byte */ 192 int in_base_pos; /* bytes read */ 193 __le64 in_temp_ack; /* for reading an ack */ 194 195 struct delayed_work work; /* send|recv work */ 196 unsigned long delay; /* current delay interval */ 197 }; 198 199 200 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss); 201 extern int ceph_parse_ips(const char *c, const char *end, 202 struct ceph_entity_addr *addr, 203 int max_count, int *count); 204 205 206 extern int ceph_msgr_init(void); 207 extern void ceph_msgr_exit(void); 208 extern void ceph_msgr_flush(void); 209 210 extern struct ceph_messenger *ceph_messenger_create( 211 struct ceph_entity_addr *myaddr, 212 u32 features, u32 required); 213 extern void ceph_messenger_destroy(struct ceph_messenger *); 214 215 extern void ceph_con_init(struct ceph_messenger *msgr, 216 struct ceph_connection *con); 217 extern void ceph_con_open(struct ceph_connection *con, 218 struct ceph_entity_addr *addr); 219 extern bool ceph_con_opened(struct ceph_connection *con); 220 extern void ceph_con_close(struct ceph_connection *con); 221 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg); 222 extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg); 223 extern void ceph_con_revoke_message(struct ceph_connection *con, 224 struct ceph_msg *msg); 225 extern void ceph_con_keepalive(struct ceph_connection *con); 226 extern struct ceph_connection *ceph_con_get(struct ceph_connection *con); 227 extern void ceph_con_put(struct ceph_connection *con); 228 229 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, 230 bool can_fail); 231 extern void ceph_msg_kfree(struct ceph_msg *m); 232 233 234 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) 235 { 236 kref_get(&msg->kref); 237 return msg; 238 } 239 extern void ceph_msg_last_put(struct kref *kref); 240 static inline void ceph_msg_put(struct ceph_msg *msg) 241 { 242 kref_put(&msg->kref, ceph_msg_last_put); 243 } 244 245 extern void ceph_msg_dump(struct ceph_msg *msg); 246 247 #endif 248