include/linux/ceph/messenger.h

   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 #include <net/net_namespace.h>
  12
  13 #include <linux/ceph/types.h>
  14 #include <linux/ceph/buffer.h>
  15
  16 struct ceph_msg;
  17 struct ceph_connection;
  18
  19 /*
  20  * Ceph defines these callbacks for handling connection events.
  21  */
  22 struct ceph_connection_operations {
  23         struct ceph_connection *(*get)(struct ceph_connection *);
  24         void (*put)(struct ceph_connection *);
  25
  26         /* handle an incoming message. */
  27         void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
  28
  29         /* authorize an outgoing connection */
  30         struct ceph_auth_handshake *(*get_authorizer) (
  31                                 struct ceph_connection *con,
  32                                int *proto, int force_new);
  33         int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
  34         int (*invalidate_authorizer)(struct ceph_connection *con);
  35
  36         /* there was some error on the socket (disconnect, whatever) */
  37         void (*fault) (struct ceph_connection *con);
  38
  39         /* a remote host as terminated a message exchange session, and messages
  40          * we sent (or they tried to send us) may be lost. */
  41         void (*peer_reset) (struct ceph_connection *con);
  42
  43         struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
  44                                         struct ceph_msg_header *hdr,
  45                                         int *skip);
  46
  47         int (*sign_message) (struct ceph_msg *msg);
  48         int (*check_message_signature) (struct ceph_msg *msg);
  49 };
  50
  51 /* use format string %s%d */
  52 #define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
  53
  54 struct ceph_messenger {
  55         struct ceph_entity_inst inst;    /* my name+address */
  56         struct ceph_entity_addr my_enc_addr;
  57
  58         atomic_t stopping;
  59         possible_net_t net;
  60
  61         /*
  62          * the global_seq counts connections i (attempt to) initiate
  63          * in order to disambiguate certain connect race conditions.
  64          */
  65         u32 global_seq;
  66         spinlock_t global_seq_lock;
  67 };
  68
  69 enum ceph_msg_data_type {
  70         CEPH_MSG_DATA_NONE,     /* message contains no data payload */
  71         CEPH_MSG_DATA_PAGES,    /* data source/destination is a page array */
  72         CEPH_MSG_DATA_PAGELIST, /* data source/destination is a pagelist */
  73 #ifdef CONFIG_BLOCK
  74         CEPH_MSG_DATA_BIO,      /* data source/destination is a bio list */
  75 #endif /* CONFIG_BLOCK */
  76 };
  77
  78 static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type)
  79 {
  80         switch (type) {
  81         case CEPH_MSG_DATA_NONE:
  82         case CEPH_MSG_DATA_PAGES:
  83         case CEPH_MSG_DATA_PAGELIST:
  84 #ifdef CONFIG_BLOCK
  85         case CEPH_MSG_DATA_BIO:
  86 #endif /* CONFIG_BLOCK */
  87                 return true;
  88         default:
  89                 return false;
  90         }
  91 }
  92
  93 struct ceph_msg_data {
  94         struct list_head                links;  /* ceph_msg->data */
  95         enum ceph_msg_data_type         type;
  96         union {
  97 #ifdef CONFIG_BLOCK
  98                 struct {
  99                         struct bio      *bio;
 100                         size_t          bio_length;
 101                 };
 102 #endif /* CONFIG_BLOCK */
 103                 struct {
 104                         struct page     **pages;        /* NOT OWNER. */
 105                         size_t          length;         /* total # bytes */
 106                         unsigned int    alignment;      /* first page */
 107                 };
 108                 struct ceph_pagelist    *pagelist;
 109         };
 110 };
 111
 112 struct ceph_msg_data_cursor {
 113         size_t                  total_resid;    /* across all data items */
 114         struct list_head        *data_head;     /* = &ceph_msg->data */
 115
 116         struct ceph_msg_data    *data;          /* current data item */
 117         size_t                  resid;          /* bytes not yet consumed */
 118         bool                    last_piece;     /* current is last piece */
 119         bool                    need_crc;       /* crc update needed */
 120         union {
 121 #ifdef CONFIG_BLOCK
 122                 struct {                                /* bio */
 123                         struct bio      *bio;           /* bio from list */
 124                         struct bvec_iter bvec_iter;
 125                 };
 126 #endif /* CONFIG_BLOCK */
 127                 struct {                                /* pages */
 128                         unsigned int    page_offset;    /* offset in page */
 129                         unsigned short  page_index;     /* index in array */
 130                         unsigned short  page_count;     /* pages in array */
 131                 };
 132                 struct {                                /* pagelist */
 133                         struct page     *page;          /* page from list */
 134                         size_t          offset;         /* bytes from list */
 135                 };
 136         };
 137 };
 138
 139 /*
 140  * a single message.  it contains a header (src, dest, message type, etc.),
 141  * footer (crc values, mainly), a "front" message body, and possibly a
 142  * data payload (stored in some number of pages).
 143  */
 144 struct ceph_msg {
 145         struct ceph_msg_header hdr;     /* header */
 146         union {
 147                 struct ceph_msg_footer footer;          /* footer */
 148                 struct ceph_msg_footer_old old_footer;  /* old format footer */
 149         };
 150         struct kvec front;              /* unaligned blobs of message */
 151         struct ceph_buffer *middle;
 152
 153         size_t                          data_length;
 154         struct list_head                data;
 155         struct ceph_msg_data_cursor     cursor;
 156
 157         struct ceph_connection *con;
 158         struct list_head list_head;     /* links for connection lists */
 159
 160         struct kref kref;
 161         bool more_to_follow;
 162         bool needs_out_seq;
 163         int front_alloc_len;
 164         unsigned long ack_stamp;        /* tx: when we were acked */
 165
 166         struct ceph_msgpool *pool;
 167 };
 168
 169 /* ceph connection fault delay defaults, for exponential backoff */
 170 #define BASE_DELAY_INTERVAL     (HZ/2)
 171 #define MAX_DELAY_INTERVAL      (5 * 60 * HZ)
 172
 173 /*
 174  * A single connection with another host.
 175  *
 176  * We maintain a queue of outgoing messages, and some session state to
 177  * ensure that we can preserve the lossless, ordered delivery of
 178  * messages in the case of a TCP disconnect.
 179  */
 180 struct ceph_connection {
 181         void *private;
 182
 183         const struct ceph_connection_operations *ops;
 184
 185         struct ceph_messenger *msgr;
 186
 187         atomic_t sock_state;
 188         struct socket *sock;
 189         struct ceph_entity_addr peer_addr; /* peer address */
 190         struct ceph_entity_addr peer_addr_for_me;
 191
 192         unsigned long flags;
 193         unsigned long state;
 194         const char *error_msg;  /* error message, if any */
 195
 196         struct ceph_entity_name peer_name; /* peer name */
 197
 198         u64 peer_features;
 199         u32 connect_seq;      /* identify the most recent connection
 200                                  attempt for this connection, client */
 201         u32 peer_global_seq;  /* peer's global seq for this connection */
 202
 203         int auth_retry;       /* true if we need a newer authorizer */
 204         void *auth_reply_buf;   /* where to put the authorizer reply */
 205         int auth_reply_buf_len;
 206
 207         struct mutex mutex;
 208
 209         /* out queue */
 210         struct list_head out_queue;
 211         struct list_head out_sent;   /* sending or sent but unacked */
 212         u64 out_seq;                 /* last message queued for send */
 213
 214         u64 in_seq, in_seq_acked;  /* last message received, acked */
 215
 216         /* connection negotiation temps */
 217         char in_banner[CEPH_BANNER_MAX_LEN];
 218         struct ceph_msg_connect out_connect;
 219         struct ceph_msg_connect_reply in_reply;
 220         struct ceph_entity_addr actual_peer_addr;
 221
 222         /* message out temps */
 223         struct ceph_msg_header out_hdr;
 224         struct ceph_msg *out_msg;        /* sending message (== tail of
 225                                             out_sent) */
 226         bool out_msg_done;
 227
 228         struct kvec out_kvec[8],         /* sending header/footer data */
 229                 *out_kvec_cur;
 230         int out_kvec_left;   /* kvec's left in out_kvec */
 231         int out_skip;        /* skip this many bytes */
 232         int out_kvec_bytes;  /* total bytes left */
 233         int out_more;        /* there is more data after the kvecs */
 234         __le64 out_temp_ack; /* for writing an ack */
 235         struct ceph_timespec out_temp_keepalive2; /* for writing keepalive2
 236                                                      stamp */
 237
 238         /* message in temps */
 239         struct ceph_msg_header in_hdr;
 240         struct ceph_msg *in_msg;
 241         u32 in_front_crc, in_middle_crc, in_data_crc;  /* calculated crc */
 242
 243         char in_tag;         /* protocol control byte */
 244         int in_base_pos;     /* bytes read */
 245         __le64 in_temp_ack;  /* for reading an ack */
 246
 247         struct timespec last_keepalive_ack; /* keepalive2 ack stamp */
 248
 249         struct delayed_work work;           /* send|recv work */
 250         unsigned long       delay;          /* current delay interval */
 251 };
 252
 253
 254 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
 255 extern int ceph_parse_ips(const char *c, const char *end,
 256                           struct ceph_entity_addr *addr,
 257                           int max_count, int *count);
 258
 259
 260 extern int ceph_msgr_init(void);
 261 extern void ceph_msgr_exit(void);
 262 extern void ceph_msgr_flush(void);
 263
 264 extern void ceph_messenger_init(struct ceph_messenger *msgr,
 265                                 struct ceph_entity_addr *myaddr);
 266 extern void ceph_messenger_fini(struct ceph_messenger *msgr);
 267
 268 extern void ceph_con_init(struct ceph_connection *con, void *private,
 269                         const struct ceph_connection_operations *ops,
 270                         struct ceph_messenger *msgr);
 271 extern void ceph_con_open(struct ceph_connection *con,
 272                           __u8 entity_type, __u64 entity_num,
 273                           struct ceph_entity_addr *addr);
 274 extern bool ceph_con_opened(struct ceph_connection *con);
 275 extern void ceph_con_close(struct ceph_connection *con);
 276 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
 277
 278 extern void ceph_msg_revoke(struct ceph_msg *msg);
 279 extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
 280
 281 extern void ceph_con_keepalive(struct ceph_connection *con);
 282 extern bool ceph_con_keepalive_expired(struct ceph_connection *con,
 283                                        unsigned long interval);
 284
 285 extern void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
 286                                 size_t length, size_t alignment);
 287 extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
 288                                 struct ceph_pagelist *pagelist);
 289 #ifdef CONFIG_BLOCK
 290 extern void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
 291                                 size_t length);
 292 #endif /* CONFIG_BLOCK */
 293
 294 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
 295                                      bool can_fail);
 296
 297 extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg);
 298 extern void ceph_msg_put(struct ceph_msg *msg);
 299
 300 extern void ceph_msg_dump(struct ceph_msg *msg);
 301
 302 #endif