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Linux/include/linux/ceph/messenger.h

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  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 extern struct workqueue_struct *ceph_msgr_wq;       /* receive work queue */
 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         int (*get_authorizer) (struct ceph_connection *con,
 31                                void **buf, int *len, int *proto,
 32                                void **reply_buf, int *reply_len, int force_new);
 33         int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
 34         int (*invalidate_authorizer)(struct ceph_connection *con);
 35 
 36         /* protocol version mismatch */
 37         void (*bad_proto) (struct ceph_connection *con);
 38 
 39         /* there was some error on the socket (disconnect, whatever) */
 40         void (*fault) (struct ceph_connection *con);
 41 
 42         /* a remote host as terminated a message exchange session, and messages
 43          * we sent (or they tried to send us) may be lost. */
 44         void (*peer_reset) (struct ceph_connection *con);
 45 
 46         struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
 47                                         struct ceph_msg_header *hdr,
 48                                         int *skip);
 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         struct page *zero_page;          /* used in certain error cases */
 58 
 59         bool nocrc;
 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         u32 supported_features;
 69         u32 required_features;
 70 };
 71 
 72 /*
 73  * a single message.  it contains a header (src, dest, message type, etc.),
 74  * footer (crc values, mainly), a "front" message body, and possibly a
 75  * data payload (stored in some number of pages).
 76  */
 77 struct ceph_msg {
 78         struct ceph_msg_header hdr;     /* header */
 79         struct ceph_msg_footer footer;  /* footer */
 80         struct kvec front;              /* unaligned blobs of message */
 81         struct ceph_buffer *middle;
 82         struct page **pages;            /* data payload.  NOT OWNER. */
 83         unsigned nr_pages;              /* size of page array */
 84         unsigned page_alignment;        /* io offset in first page */
 85         struct ceph_pagelist *pagelist; /* instead of pages */
 86         struct list_head list_head;
 87         struct kref kref;
 88         struct bio  *bio;               /* instead of pages/pagelist */
 89         struct bio  *bio_iter;          /* bio iterator */
 90         int bio_seg;                    /* current bio segment */
 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_alloc_len;
 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         int 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  * ceph_connection state bit flags
113  */
114 #define LOSSYTX         0  /* we can close channel or drop messages on errors */
115 #define CONNECTING      1
116 #define NEGOTIATING     2
117 #define KEEPALIVE_PENDING      3
118 #define WRITE_PENDING   4  /* we have data ready to send */
119 #define STANDBY         8  /* no outgoing messages, socket closed.  we keep
120                             * the ceph_connection around to maintain shared
121                             * state with the peer. */
122 #define CLOSED          10 /* we've closed the connection */
123 #define SOCK_CLOSED     11 /* socket state changed to closed */
124 #define OPENING         13 /* open connection w/ (possibly new) peer */
125 #define DEAD            14 /* dead, about to kfree */
126 #define BACKOFF         15
127 
128 /*
129  * A single connection with another host.
130  *
131  * We maintain a queue of outgoing messages, and some session state to
132  * ensure that we can preserve the lossless, ordered delivery of
133  * messages in the case of a TCP disconnect.
134  */
135 struct ceph_connection {
136         void *private;
137         atomic_t nref;
138 
139         const struct ceph_connection_operations *ops;
140 
141         struct ceph_messenger *msgr;
142         struct socket *sock;
143         unsigned long state;    /* connection state (see flags above) */
144         const char *error_msg;  /* error message, if any */
145 
146         struct ceph_entity_addr peer_addr; /* peer address */
147         struct ceph_entity_name peer_name; /* peer name */
148         struct ceph_entity_addr peer_addr_for_me;
149         unsigned peer_features;
150         u32 connect_seq;      /* identify the most recent connection
151                                  attempt for this connection, client */
152         u32 peer_global_seq;  /* peer's global seq for this connection */
153 
154         int auth_retry;       /* true if we need a newer authorizer */
155         void *auth_reply_buf;   /* where to put the authorizer reply */
156         int auth_reply_buf_len;
157 
158         struct mutex mutex;
159 
160         /* out queue */
161         struct list_head out_queue;
162         struct list_head out_sent;   /* sending or sent but unacked */
163         u64 out_seq;                 /* last message queued for send */
164 
165         u64 in_seq, in_seq_acked;  /* last message received, acked */
166 
167         /* connection negotiation temps */
168         char in_banner[CEPH_BANNER_MAX_LEN];
169         union {
170                 struct {  /* outgoing connection */
171                         struct ceph_msg_connect out_connect;
172                         struct ceph_msg_connect_reply in_reply;
173                 };
174                 struct {  /* incoming */
175                         struct ceph_msg_connect in_connect;
176                         struct ceph_msg_connect_reply out_reply;
177                 };
178         };
179         struct ceph_entity_addr actual_peer_addr;
180 
181         /* message out temps */
182         struct ceph_msg *out_msg;        /* sending message (== tail of
183                                             out_sent) */
184         bool out_msg_done;
185         struct ceph_msg_pos out_msg_pos;
186 
187         struct kvec out_kvec[8],         /* sending header/footer data */
188                 *out_kvec_cur;
189         int out_kvec_left;   /* kvec's left in out_kvec */
190         int out_skip;        /* skip this many bytes */
191         int out_kvec_bytes;  /* total bytes left */
192         bool out_kvec_is_msg; /* kvec refers to out_msg */
193         int out_more;        /* there is more data after the kvecs */
194         __le64 out_temp_ack; /* for writing an ack */
195 
196         /* message in temps */
197         struct ceph_msg_header in_hdr;
198         struct ceph_msg *in_msg;
199         struct ceph_msg_pos in_msg_pos;
200         u32 in_front_crc, in_middle_crc, in_data_crc;  /* calculated crc */
201 
202         char in_tag;         /* protocol control byte */
203         int in_base_pos;     /* bytes read */
204         __le64 in_temp_ack;  /* for reading an ack */
205 
206         struct delayed_work work;           /* send|recv work */
207         unsigned long       delay;          /* current delay interval */
208 };
209 
210 
211 extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
212 extern int ceph_parse_ips(const char *c, const char *end,
213                           struct ceph_entity_addr *addr,
214                           int max_count, int *count);
215 
216 
217 extern int ceph_msgr_init(void);
218 extern void ceph_msgr_exit(void);
219 extern void ceph_msgr_flush(void);
220 
221 extern struct ceph_messenger *ceph_messenger_create(
222         struct ceph_entity_addr *myaddr,
223         u32 features, u32 required);
224 extern void ceph_messenger_destroy(struct ceph_messenger *);
225 
226 extern void ceph_con_init(struct ceph_messenger *msgr,
227                           struct ceph_connection *con);
228 extern void ceph_con_open(struct ceph_connection *con,
229                           struct ceph_entity_addr *addr);
230 extern bool ceph_con_opened(struct ceph_connection *con);
231 extern void ceph_con_close(struct ceph_connection *con);
232 extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
233 extern void ceph_con_revoke(struct ceph_connection *con, struct ceph_msg *msg);
234 extern void ceph_con_revoke_message(struct ceph_connection *con,
235                                   struct ceph_msg *msg);
236 extern void ceph_con_keepalive(struct ceph_connection *con);
237 extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
238 extern void ceph_con_put(struct ceph_connection *con);
239 
240 extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
241                                      bool can_fail);
242 extern void ceph_msg_kfree(struct ceph_msg *m);
243 
244 
245 static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
246 {
247         kref_get(&msg->kref);
248         return msg;
249 }
250 extern void ceph_msg_last_put(struct kref *kref);
251 static inline void ceph_msg_put(struct ceph_msg *msg)
252 {
253         kref_put(&msg->kref, ceph_msg_last_put);
254 }
255 
256 extern void ceph_msg_dump(struct ceph_msg *msg);
257 
258 #endif
259 

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