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 15struct ceph_msg; 16struct ceph_connection; 17 18extern struct workqueue_struct *ceph_msgr_wq; /* receive work queue */ 19 20/* 21 * Ceph defines these callbacks for handling connection events. 22 */ 23struct 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 55struct 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 70/* 71 * a single message. it contains a header (src, dest, message type, etc.), 72 * footer (crc values, mainly), a "front" message body, and possibly a 73 * data payload (stored in some number of pages). 74 */ 75struct ceph_msg { 76 struct ceph_msg_header hdr; /* header */ 77 struct ceph_msg_footer footer; /* footer */ 78 struct kvec front; /* unaligned blobs of message */ 79 struct ceph_buffer *middle; 80 struct page **pages; /* data payload. NOT OWNER. */ 81 unsigned nr_pages; /* size of page array */ 82 struct ceph_pagelist *pagelist; /* instead of pages */ 83 struct list_head list_head; 84 struct kref kref; 85 bool front_is_vmalloc; 86 bool more_to_follow; 87 bool needs_out_seq; 88 int front_max; 89 90 struct ceph_msgpool *pool; 91}; 92 93struct ceph_msg_pos { 94 int page, page_pos; /* which page; offset in page */ 95 int data_pos; /* offset in data payload */ 96 int did_page_crc; /* true if we've calculated crc for current page */ 97}; 98 99/* ceph connection fault delay defaults, for exponential backoff */ 100#define BASE_DELAY_INTERVAL (HZ/2) 101#define MAX_DELAY_INTERVAL (5 * 60 * HZ) 102 103/* 104 * ceph_connection state bit flags 105 * 106 * QUEUED and BUSY are used together to ensure that only a single 107 * thread is currently opening, reading or writing data to the socket. 108 */ 109#define LOSSYTX 0 /* we can close channel or drop messages on errors */ 110#define CONNECTING 1 111#define NEGOTIATING 2 112#define KEEPALIVE_PENDING 3 113#define WRITE_PENDING 4 /* we have data ready to send */ 114#define QUEUED 5 /* there is work queued on this connection */ 115#define BUSY 6 /* work is being done */ 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 */ 123 124/* 125 * A single connection with another host. 126 * 127 * We maintain a queue of outgoing messages, and some session state to 128 * ensure that we can preserve the lossless, ordered delivery of 129 * messages in the case of a TCP disconnect. 130 */ 131struct ceph_connection { 132 void *private; 133 atomic_t nref; 134 135 const struct ceph_connection_operations *ops; 136 137 struct ceph_messenger *msgr; 138 struct socket *sock; 139 unsigned long state; /* connection state (see flags above) */ 140 const char *error_msg; /* error message, if any */ 141 142 struct ceph_entity_addr peer_addr; /* peer address */ 143 struct ceph_entity_name peer_name; /* peer name */ 144 struct ceph_entity_addr peer_addr_for_me; 145 unsigned peer_features; 146 u32 connect_seq; /* identify the most recent connection 147 attempt for this connection, client */ 148 u32 peer_global_seq; /* peer's global seq for this connection */ 149 150 int auth_retry; /* true if we need a newer authorizer */ 151 void *auth_reply_buf; /* where to put the authorizer reply */ 152 int auth_reply_buf_len; 153 154 struct mutex mutex; 155 156 /* out queue */ 157 struct list_head out_queue; 158 struct list_head out_sent; /* sending or sent but unacked */ 159 u64 out_seq; /* last message queued for send */ 160 bool out_keepalive_pending; 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 union { 167 struct { /* outgoing connection */ 168 struct ceph_msg_connect out_connect; 169 struct ceph_msg_connect_reply in_reply; 170 }; 171 struct { /* incoming */ 172 struct ceph_msg_connect in_connect; 173 struct ceph_msg_connect_reply out_reply; 174 }; 175 }; 176 struct ceph_entity_addr actual_peer_addr; 177 178 /* message out temps */ 179 struct ceph_msg *out_msg; /* sending message (== tail of 180 out_sent) */ 181 bool out_msg_done; 182 struct ceph_msg_pos out_msg_pos; 183 184 struct kvec out_kvec[8], /* sending header/footer data */ 185 *out_kvec_cur; 186 int out_kvec_left; /* kvec's left in out_kvec */ 187 int out_skip; /* skip this many bytes */ 188 int out_kvec_bytes; /* total bytes left */ 189 bool out_kvec_is_msg; /* kvec refers to out_msg */ 190 int out_more; /* there is more data after the kvecs */ 191 __le64 out_temp_ack; /* for writing an ack */ 192 193 /* message in temps */ 194 struct ceph_msg_header in_hdr; 195 struct ceph_msg *in_msg; 196 struct ceph_msg_pos in_msg_pos; 197 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */ 198 199 char in_tag; /* protocol control byte */ 200 int in_base_pos; /* bytes read */ 201 __le64 in_temp_ack; /* for reading an ack */ 202 203 struct delayed_work work; /* send|recv work */ 204 unsigned long delay; /* current delay interval */ 205}; 206 207 208extern const char *pr_addr(const struct sockaddr_storage *ss); 209extern int ceph_parse_ips(const char *c, const char *end, 210 struct ceph_entity_addr *addr, 211 int max_count, int *count); 212 213 214extern int ceph_msgr_init(void); 215extern void ceph_msgr_exit(void); 216extern void ceph_msgr_flush(void); 217 218extern struct ceph_messenger *ceph_messenger_create( 219 struct ceph_entity_addr *myaddr); 220extern void ceph_messenger_destroy(struct ceph_messenger *); 221 222extern void ceph_con_init(struct ceph_messenger *msgr, 223 struct ceph_connection *con); 224extern void ceph_con_open(struct ceph_connection *con, 225 struct ceph_entity_addr *addr); 226extern bool ceph_con_opened(struct ceph_connection *con); 227extern void ceph_con_close(struct ceph_connection *con); 228extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg); 229extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg); 230extern void ceph_con_revoke_message(struct ceph_connection *con, 231 struct ceph_msg *msg); 232extern void ceph_con_keepalive(struct ceph_connection *con); 233extern struct ceph_connection *ceph_con_get(struct ceph_connection *con); 234extern void ceph_con_put(struct ceph_connection *con); 235 236extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags); 237extern void ceph_msg_kfree(struct ceph_msg *m); 238 239 240static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg) 241{ 242 kref_get(&msg->kref); 243 return msg; 244} 245extern void ceph_msg_last_put(struct kref *kref); 246static inline void ceph_msg_put(struct ceph_msg *msg) 247{ 248 kref_put(&msg->kref, ceph_msg_last_put); 249} 250 251extern void ceph_msg_dump(struct ceph_msg *msg); 252 253#endif 254