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 /* 68 * a single message. it contains a header (src, dest, message type, etc.), 69 * footer (crc values, mainly), a "front" message body, and possibly a 70 * data payload (stored in some number of pages). 71 */ 72 struct ceph_msg { 73 struct ceph_msg_header hdr; /* header */ 74 struct ceph_msg_footer footer; /* footer */ 75 struct kvec front; /* unaligned blobs of message */ 76 struct ceph_buffer *middle; 77 struct page **pages; /* data payload. NOT OWNER. */ 78 unsigned nr_pages; /* size of page array */ 79 unsigned page_alignment; /* io offset in first page */ 80 struct ceph_pagelist *pagelist; /* instead of pages */ 81 82 struct ceph_connection *con; 83 struct list_head list_head; 84 85 struct kref kref; 86 #ifdef CONFIG_BLOCK 87 struct bio *bio; /* instead of pages/pagelist */ 88 struct bio *bio_iter; /* bio iterator */ 89 int bio_seg; /* current bio segment */ 90 #endif /* CONFIG_BLOCK */ 91 struct ceph_pagelist *trail; /* the trailing part of the data */ 92 bool front_is_vmalloc; 93 bool more_to_follow; 94 bool needs_out_seq; 95 int front_max; 96 unsigned long ack_stamp; /* tx: when we were acked */ 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 bool 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 * A single connection with another host. 113 * 114 * We maintain a queue of outgoing messages, and some session state to 115 * ensure that we can preserve the lossless, ordered delivery of 116 * messages in the case of a TCP disconnect. 117 */ 118 struct ceph_connection { 119 void *private; 120 121 const struct ceph_connection_operations *ops; 122 123 struct ceph_messenger *msgr; 124 125 atomic_t sock_state; 126 struct socket *sock; 127 struct ceph_entity_addr peer_addr; /* peer address */ 128 struct ceph_entity_addr peer_addr_for_me; 129 130 unsigned long flags; 131 unsigned long state; 132 const char *error_msg; /* error message, if any */ 133 134 struct ceph_entity_name peer_name; /* peer name */ 135 136 unsigned peer_features; 137 u32 connect_seq; /* identify the most recent connection 138 attempt for this connection, client */ 139 u32 peer_global_seq; /* peer's global seq for this connection */ 140 141 int auth_retry; /* true if we need a newer authorizer */ 142 void *auth_reply_buf; /* where to put the authorizer reply */ 143 int auth_reply_buf_len; 144 145 struct mutex mutex; 146 147 /* out queue */ 148 struct list_head out_queue; 149 struct list_head out_sent; /* sending or sent but unacked */ 150 u64 out_seq; /* last message queued for send */ 151 152 u64 in_seq, in_seq_acked; /* last message received, acked */ 153 154 /* connection negotiation temps */ 155 char in_banner[CEPH_BANNER_MAX_LEN]; 156 struct ceph_msg_connect out_connect; 157 struct ceph_msg_connect_reply in_reply; 158 struct ceph_entity_addr actual_peer_addr; 159 160 /* message out temps */ 161 struct ceph_msg *out_msg; /* sending message (== tail of 162 out_sent) */ 163 bool out_msg_done; 164 struct ceph_msg_pos out_msg_pos; 165 166 struct kvec out_kvec[8], /* sending header/footer data */ 167 *out_kvec_cur; 168 int out_kvec_left; /* kvec's left in out_kvec */ 169 int out_skip; /* skip this many bytes */ 170 int out_kvec_bytes; /* total bytes left */ 171 bool out_kvec_is_msg; /* kvec refers to out_msg */ 172 int out_more; /* there is more data after the kvecs */ 173 __le64 out_temp_ack; /* for writing an ack */ 174 175 /* message in temps */ 176 struct ceph_msg_header in_hdr; 177 struct ceph_msg *in_msg; 178 struct ceph_msg_pos in_msg_pos; 179 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */ 180 181 char in_tag; /* protocol control byte */ 182 int in_base_pos; /* bytes read */ 183 __le64 in_temp_ack; /* for reading an ack */ 184 185 struct delayed_work work; /* send|recv work */ 186 unsigned long delay; /* current delay interval */ 187 }; 188 189 190 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss); 191 extern int ceph_parse_ips(const char *c, const char *end, 192 struct ceph_entity_addr *addr, 193 int max_count, int *count); 194 195 196 extern int ceph_msgr_init(void); 197 extern void ceph_msgr_exit(void); 198 extern void ceph_msgr_flush(void); 199 200 extern void ceph_messenger_init(struct ceph_messenger *msgr, 201 struct ceph_entity_addr *myaddr, 202 u32 supported_features, 203 u32 required_features, 204 bool nocrc); 205 206 extern void ceph_con_init(struct ceph_connection *con, void *private, 207 const struct ceph_connection_operations *ops, 208 struct ceph_messenger *msgr); 209 extern void ceph_con_open(struct ceph_connection *con, 210 __u8 entity_type, __u64 entity_num, 211 struct ceph_entity_addr *addr); 212 extern bool ceph_con_opened(struct ceph_connection *con); 213 extern void ceph_con_close(struct ceph_connection *con); 214 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg); 215 216 extern void ceph_msg_revoke(struct ceph_msg *msg); 217 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg); 218 219 extern void ceph_con_keepalive(struct ceph_connection *con); 220 221 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, 222 bool can_fail); 223 extern void ceph_msg_kfree(struct ceph_msg *m); 224 225 226 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) 227 { 228 kref_get(&msg->kref); 229 return msg; 230 } 231 extern void ceph_msg_last_put(struct kref *kref); 232 static inline void ceph_msg_put(struct ceph_msg *msg) 233 { 234 kref_put(&msg->kref, ceph_msg_last_put); 235 } 236 237 extern void ceph_msg_dump(struct ceph_msg *msg); 238 239 #endif 240