1/* SPDX-License-Identifier: GPL-2.0 */ 2#ifndef __FS_CEPH_MESSENGER_H 3#define __FS_CEPH_MESSENGER_H 4 5#include <linux/bvec.h> 6#include <linux/crypto.h> 7#include <linux/kref.h> 8#include <linux/mutex.h> 9#include <linux/net.h> 10#include <linux/radix-tree.h> 11#include <linux/uio.h> 12#include <linux/workqueue.h> 13#include <net/net_namespace.h> 14 15#include <linux/ceph/types.h> 16#include <linux/ceph/buffer.h> 17 18struct ceph_msg; 19struct ceph_connection; 20struct ceph_msg_data_cursor; 21 22/* 23 * Ceph defines these callbacks for handling connection events. 24 */ 25struct ceph_connection_operations { 26 struct ceph_connection *(*get)(struct ceph_connection *); 27 void (*put)(struct ceph_connection *); 28 29 /* handle an incoming message. */ 30 void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m); 31 32 /* authorize an outgoing connection */ 33 struct ceph_auth_handshake *(*get_authorizer) ( 34 struct ceph_connection *con, 35 int *proto, int force_new); 36 int (*add_authorizer_challenge)(struct ceph_connection *con, 37 void *challenge_buf, 38 int challenge_buf_len); 39 int (*verify_authorizer_reply) (struct ceph_connection *con); 40 int (*invalidate_authorizer)(struct ceph_connection *con); 41 42 /* there was some error on the socket (disconnect, whatever) */ 43 void (*fault) (struct ceph_connection *con); 44 45 /* a remote host as terminated a message exchange session, and messages 46 * we sent (or they tried to send us) may be lost. */ 47 void (*peer_reset) (struct ceph_connection *con); 48 49 struct ceph_msg * (*alloc_msg) (struct ceph_connection *con, 50 struct ceph_msg_header *hdr, 51 int *skip); 52 53 void (*reencode_message) (struct ceph_msg *msg); 54 55 int (*sign_message) (struct ceph_msg *msg); 56 int (*check_message_signature) (struct ceph_msg *msg); 57 58 /* msgr2 authentication exchange */ 59 int (*get_auth_request)(struct ceph_connection *con, 60 void *buf, int *buf_len, 61 void **authorizer, int *authorizer_len); 62 int (*handle_auth_reply_more)(struct ceph_connection *con, 63 void *reply, int reply_len, 64 void *buf, int *buf_len, 65 void **authorizer, int *authorizer_len); 66 int (*handle_auth_done)(struct ceph_connection *con, 67 u64 global_id, void *reply, int reply_len, 68 u8 *session_key, int *session_key_len, 69 u8 *con_secret, int *con_secret_len); 70 int (*handle_auth_bad_method)(struct ceph_connection *con, 71 int used_proto, int result, 72 const int *allowed_protos, int proto_cnt, 73 const int *allowed_modes, int mode_cnt); 74 75 /** 76 * sparse_read: read sparse data 77 * @con: connection we're reading from 78 * @cursor: data cursor for reading extents 79 * @buf: optional buffer to read into 80 * 81 * This should be called more than once, each time setting up to 82 * receive an extent into the current cursor position, and zeroing 83 * the holes between them. 84 * 85 * Returns amount of data to be read (in bytes), 0 if reading is 86 * complete, or -errno if there was an error. 87 * 88 * If @buf is set on a >0 return, then the data should be read into 89 * the provided buffer. Otherwise, it should be read into the cursor. 90 * 91 * The sparse read operation is expected to initialize the cursor 92 * with a length covering up to the end of the last extent. 93 */ 94 int (*sparse_read)(struct ceph_connection *con, 95 struct ceph_msg_data_cursor *cursor, 96 char **buf); 97 98}; 99 100/* use format string %s%lld */ 101#define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num) 102 103struct ceph_messenger { 104 struct ceph_entity_inst inst; /* my name+address */ 105 struct ceph_entity_addr my_enc_addr; 106 107 atomic_t stopping; 108 possible_net_t net; 109 110 /* 111 * the global_seq counts connections i (attempt to) initiate 112 * in order to disambiguate certain connect race conditions. 113 */ 114 u32 global_seq; 115 spinlock_t global_seq_lock; 116}; 117 118enum ceph_msg_data_type { 119 CEPH_MSG_DATA_NONE, /* message contains no data payload */ 120 CEPH_MSG_DATA_PAGES, /* data source/destination is a page array */ 121 CEPH_MSG_DATA_PAGELIST, /* data source/destination is a pagelist */ 122#ifdef CONFIG_BLOCK 123 CEPH_MSG_DATA_BIO, /* data source/destination is a bio list */ 124#endif /* CONFIG_BLOCK */ 125 CEPH_MSG_DATA_BVECS, /* data source/destination is a bio_vec array */ 126 CEPH_MSG_DATA_ITER, /* data source/destination is an iov_iter */ 127}; 128 129#ifdef CONFIG_BLOCK 130 131struct ceph_bio_iter { 132 struct bio *bio; 133 struct bvec_iter iter; 134}; 135 136#define __ceph_bio_iter_advance_step(it, n, STEP) do { \ 137 unsigned int __n = (n), __cur_n; \ 138 \ 139 while (__n) { \ 140 BUG_ON(!(it)->iter.bi_size); \ 141 __cur_n = min((it)->iter.bi_size, __n); \ 142 (void)(STEP); \ 143 bio_advance_iter((it)->bio, &(it)->iter, __cur_n); \ 144 if (!(it)->iter.bi_size && (it)->bio->bi_next) { \ 145 dout("__ceph_bio_iter_advance_step next bio\n"); \ 146 (it)->bio = (it)->bio->bi_next; \ 147 (it)->iter = (it)->bio->bi_iter; \ 148 } \ 149 __n -= __cur_n; \ 150 } \ 151} while (0) 152 153/* 154 * Advance @it by @n bytes. 155 */ 156#define ceph_bio_iter_advance(it, n) \ 157 __ceph_bio_iter_advance_step(it, n, 0) 158 159/* 160 * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec. 161 */ 162#define ceph_bio_iter_advance_step(it, n, BVEC_STEP) \ 163 __ceph_bio_iter_advance_step(it, n, ({ \ 164 struct bio_vec bv; \ 165 struct bvec_iter __cur_iter; \ 166 \ 167 __cur_iter = (it)->iter; \ 168 __cur_iter.bi_size = __cur_n; \ 169 __bio_for_each_segment(bv, (it)->bio, __cur_iter, __cur_iter) \ 170 (void)(BVEC_STEP); \ 171 })) 172 173#endif /* CONFIG_BLOCK */ 174 175struct ceph_bvec_iter { 176 struct bio_vec *bvecs; 177 struct bvec_iter iter; 178}; 179 180#define __ceph_bvec_iter_advance_step(it, n, STEP) do { \ 181 BUG_ON((n) > (it)->iter.bi_size); \ 182 (void)(STEP); \ 183 bvec_iter_advance((it)->bvecs, &(it)->iter, (n)); \ 184} while (0) 185 186/* 187 * Advance @it by @n bytes. 188 */ 189#define ceph_bvec_iter_advance(it, n) \ 190 __ceph_bvec_iter_advance_step(it, n, 0) 191 192/* 193 * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec. 194 */ 195#define ceph_bvec_iter_advance_step(it, n, BVEC_STEP) \ 196 __ceph_bvec_iter_advance_step(it, n, ({ \ 197 struct bio_vec bv; \ 198 struct bvec_iter __cur_iter; \ 199 \ 200 __cur_iter = (it)->iter; \ 201 __cur_iter.bi_size = (n); \ 202 for_each_bvec(bv, (it)->bvecs, __cur_iter, __cur_iter) \ 203 (void)(BVEC_STEP); \ 204 })) 205 206#define ceph_bvec_iter_shorten(it, n) do { \ 207 BUG_ON((n) > (it)->iter.bi_size); \ 208 (it)->iter.bi_size = (n); \ 209} while (0) 210 211struct ceph_msg_data { 212 enum ceph_msg_data_type type; 213 union { 214#ifdef CONFIG_BLOCK 215 struct { 216 struct ceph_bio_iter bio_pos; 217 u32 bio_length; 218 }; 219#endif /* CONFIG_BLOCK */ 220 struct ceph_bvec_iter bvec_pos; 221 struct { 222 struct page **pages; 223 size_t length; /* total # bytes */ 224 unsigned int alignment; /* first page */ 225 bool own_pages; 226 }; 227 struct ceph_pagelist *pagelist; 228 struct iov_iter iter; 229 }; 230}; 231 232struct ceph_msg_data_cursor { 233 size_t total_resid; /* across all data items */ 234 235 struct ceph_msg_data *data; /* current data item */ 236 size_t resid; /* bytes not yet consumed */ 237 int sr_resid; /* residual sparse_read len */ 238 bool need_crc; /* crc update needed */ 239 union { 240#ifdef CONFIG_BLOCK 241 struct ceph_bio_iter bio_iter; 242#endif /* CONFIG_BLOCK */ 243 struct bvec_iter bvec_iter; 244 struct { /* pages */ 245 unsigned int page_offset; /* offset in page */ 246 unsigned short page_index; /* index in array */ 247 unsigned short page_count; /* pages in array */ 248 }; 249 struct { /* pagelist */ 250 struct page *page; /* page from list */ 251 size_t offset; /* bytes from list */ 252 }; 253 struct { 254 struct iov_iter iov_iter; 255 unsigned int lastlen; 256 }; 257 }; 258}; 259 260/* 261 * a single message. it contains a header (src, dest, message type, etc.), 262 * footer (crc values, mainly), a "front" message body, and possibly a 263 * data payload (stored in some number of pages). 264 */ 265struct ceph_msg { 266 struct ceph_msg_header hdr; /* header */ 267 union { 268 struct ceph_msg_footer footer; /* footer */ 269 struct ceph_msg_footer_old old_footer; /* old format footer */ 270 }; 271 struct kvec front; /* unaligned blobs of message */ 272 struct ceph_buffer *middle; 273 274 size_t data_length; 275 struct ceph_msg_data *data; 276 int num_data_items; 277 int max_data_items; 278 struct ceph_msg_data_cursor cursor; 279 280 struct ceph_connection *con; 281 struct list_head list_head; /* links for connection lists */ 282 283 struct kref kref; 284 bool more_to_follow; 285 bool needs_out_seq; 286 u64 sparse_read_total; 287 int front_alloc_len; 288 289 struct ceph_msgpool *pool; 290}; 291 292/* 293 * connection states 294 */ 295#define CEPH_CON_S_CLOSED 1 296#define CEPH_CON_S_PREOPEN 2 297#define CEPH_CON_S_V1_BANNER 3 298#define CEPH_CON_S_V1_CONNECT_MSG 4 299#define CEPH_CON_S_V2_BANNER_PREFIX 5 300#define CEPH_CON_S_V2_BANNER_PAYLOAD 6 301#define CEPH_CON_S_V2_HELLO 7 302#define CEPH_CON_S_V2_AUTH 8 303#define CEPH_CON_S_V2_AUTH_SIGNATURE 9 304#define CEPH_CON_S_V2_SESSION_CONNECT 10 305#define CEPH_CON_S_V2_SESSION_RECONNECT 11 306#define CEPH_CON_S_OPEN 12 307#define CEPH_CON_S_STANDBY 13 308 309/* 310 * ceph_connection flag bits 311 */ 312#define CEPH_CON_F_LOSSYTX 0 /* we can close channel or drop 313 messages on errors */ 314#define CEPH_CON_F_KEEPALIVE_PENDING 1 /* we need to send a keepalive */ 315#define CEPH_CON_F_WRITE_PENDING 2 /* we have data ready to send */ 316#define CEPH_CON_F_SOCK_CLOSED 3 /* socket state changed to closed */ 317#define CEPH_CON_F_BACKOFF 4 /* need to retry queuing delayed 318 work */ 319 320/* ceph connection fault delay defaults, for exponential backoff */ 321#define BASE_DELAY_INTERVAL (HZ / 4) 322#define MAX_DELAY_INTERVAL (15 * HZ) 323 324struct ceph_connection_v1_info { 325 struct kvec out_kvec[8], /* sending header/footer data */ 326 *out_kvec_cur; 327 int out_kvec_left; /* kvec's left in out_kvec */ 328 int out_skip; /* skip this many bytes */ 329 int out_kvec_bytes; /* total bytes left */ 330 bool out_more; /* there is more data after the kvecs */ 331 bool out_msg_done; 332 333 struct ceph_auth_handshake *auth; 334 int auth_retry; /* true if we need a newer authorizer */ 335 336 /* connection negotiation temps */ 337 u8 in_banner[CEPH_BANNER_MAX_LEN]; 338 struct ceph_entity_addr actual_peer_addr; 339 struct ceph_entity_addr peer_addr_for_me; 340 struct ceph_msg_connect out_connect; 341 struct ceph_msg_connect_reply in_reply; 342 343 int in_base_pos; /* bytes read */ 344 345 /* sparse reads */ 346 struct kvec in_sr_kvec; /* current location to receive into */ 347 u64 in_sr_len; /* amount of data in this extent */ 348 349 /* message in temps */ 350 u8 in_tag; /* protocol control byte */ 351 struct ceph_msg_header in_hdr; 352 __le64 in_temp_ack; /* for reading an ack */ 353 354 /* message out temps */ 355 struct ceph_msg_header out_hdr; 356 __le64 out_temp_ack; /* for writing an ack */ 357 struct ceph_timespec out_temp_keepalive2; /* for writing keepalive2 358 stamp */ 359 360 u32 connect_seq; /* identify the most recent connection 361 attempt for this session */ 362 u32 peer_global_seq; /* peer's global seq for this connection */ 363}; 364 365#define CEPH_CRC_LEN 4 366#define CEPH_GCM_KEY_LEN 16 367#define CEPH_GCM_IV_LEN sizeof(struct ceph_gcm_nonce) 368#define CEPH_GCM_BLOCK_LEN 16 369#define CEPH_GCM_TAG_LEN 16 370 371#define CEPH_PREAMBLE_LEN 32 372#define CEPH_PREAMBLE_INLINE_LEN 48 373#define CEPH_PREAMBLE_PLAIN_LEN CEPH_PREAMBLE_LEN 374#define CEPH_PREAMBLE_SECURE_LEN (CEPH_PREAMBLE_LEN + \ 375 CEPH_PREAMBLE_INLINE_LEN + \ 376 CEPH_GCM_TAG_LEN) 377#define CEPH_EPILOGUE_PLAIN_LEN (1 + 3 * CEPH_CRC_LEN) 378#define CEPH_EPILOGUE_SECURE_LEN (CEPH_GCM_BLOCK_LEN + CEPH_GCM_TAG_LEN) 379 380#define CEPH_FRAME_MAX_SEGMENT_COUNT 4 381 382struct ceph_frame_desc { 383 int fd_tag; /* FRAME_TAG_* */ 384 int fd_seg_cnt; 385 int fd_lens[CEPH_FRAME_MAX_SEGMENT_COUNT]; /* logical */ 386 int fd_aligns[CEPH_FRAME_MAX_SEGMENT_COUNT]; 387}; 388 389struct ceph_gcm_nonce { 390 __le32 fixed; 391 __le64 counter __packed; 392}; 393 394struct ceph_connection_v2_info { 395 struct iov_iter in_iter; 396 struct kvec in_kvecs[5]; /* recvmsg */ 397 struct bio_vec in_bvec; /* recvmsg (in_cursor) */ 398 int in_kvec_cnt; 399 int in_state; /* IN_S_* */ 400 401 struct iov_iter out_iter; 402 struct kvec out_kvecs[8]; /* sendmsg */ 403 struct bio_vec out_bvec; /* sendpage (out_cursor, out_zero), 404 sendmsg (out_enc_pages) */ 405 int out_kvec_cnt; 406 int out_state; /* OUT_S_* */ 407 408 int out_zero; /* # of zero bytes to send */ 409 bool out_iter_sendpage; /* use sendpage if possible */ 410 411 struct ceph_frame_desc in_desc; 412 struct ceph_msg_data_cursor in_cursor; 413 struct ceph_msg_data_cursor out_cursor; 414 415 struct crypto_shash *hmac_tfm; /* post-auth signature */ 416 struct crypto_aead *gcm_tfm; /* on-wire encryption */ 417 struct aead_request *gcm_req; 418 struct crypto_wait gcm_wait; 419 struct ceph_gcm_nonce in_gcm_nonce; 420 struct ceph_gcm_nonce out_gcm_nonce; 421 422 struct page **in_enc_pages; 423 int in_enc_page_cnt; 424 int in_enc_resid; 425 int in_enc_i; 426 struct page **out_enc_pages; 427 int out_enc_page_cnt; 428 int out_enc_resid; 429 int out_enc_i; 430 431 int con_mode; /* CEPH_CON_MODE_* */ 432 433 void *conn_bufs[16]; 434 int conn_buf_cnt; 435 int data_len_remain; 436 437 struct kvec in_sign_kvecs[8]; 438 struct kvec out_sign_kvecs[8]; 439 int in_sign_kvec_cnt; 440 int out_sign_kvec_cnt; 441 442 u64 client_cookie; 443 u64 server_cookie; 444 u64 global_seq; 445 u64 connect_seq; 446 u64 peer_global_seq; 447 448 u8 in_buf[CEPH_PREAMBLE_SECURE_LEN]; 449 u8 out_buf[CEPH_PREAMBLE_SECURE_LEN]; 450 struct { 451 u8 late_status; /* FRAME_LATE_STATUS_* */ 452 union { 453 struct { 454 u32 front_crc; 455 u32 middle_crc; 456 u32 data_crc; 457 } __packed; 458 u8 pad[CEPH_GCM_BLOCK_LEN - 1]; 459 }; 460 } out_epil; 461}; 462 463/* 464 * A single connection with another host. 465 * 466 * We maintain a queue of outgoing messages, and some session state to 467 * ensure that we can preserve the lossless, ordered delivery of 468 * messages in the case of a TCP disconnect. 469 */ 470struct ceph_connection { 471 void *private; 472 473 const struct ceph_connection_operations *ops; 474 475 struct ceph_messenger *msgr; 476 477 int state; /* CEPH_CON_S_* */ 478 atomic_t sock_state; 479 struct socket *sock; 480 481 unsigned long flags; /* CEPH_CON_F_* */ 482 const char *error_msg; /* error message, if any */ 483 484 struct ceph_entity_name peer_name; /* peer name */ 485 struct ceph_entity_addr peer_addr; /* peer address */ 486 u64 peer_features; 487 488 struct mutex mutex; 489 490 /* out queue */ 491 struct list_head out_queue; 492 struct list_head out_sent; /* sending or sent but unacked */ 493 u64 out_seq; /* last message queued for send */ 494 495 u64 in_seq, in_seq_acked; /* last message received, acked */ 496 497 struct ceph_msg *in_msg; 498 struct ceph_msg *out_msg; /* sending message (== tail of 499 out_sent) */ 500 501 struct page *bounce_page; 502 u32 in_front_crc, in_middle_crc, in_data_crc; /* calculated crc */ 503 504 struct timespec64 last_keepalive_ack; /* keepalive2 ack stamp */ 505 506 struct delayed_work work; /* send|recv work */ 507 unsigned long delay; /* current delay interval */ 508 509 union { 510 struct ceph_connection_v1_info v1; 511 struct ceph_connection_v2_info v2; 512 }; 513}; 514 515extern struct page *ceph_zero_page; 516 517void ceph_con_flag_clear(struct ceph_connection *con, unsigned long con_flag); 518void ceph_con_flag_set(struct ceph_connection *con, unsigned long con_flag); 519bool ceph_con_flag_test(struct ceph_connection *con, unsigned long con_flag); 520bool ceph_con_flag_test_and_clear(struct ceph_connection *con, 521 unsigned long con_flag); 522bool ceph_con_flag_test_and_set(struct ceph_connection *con, 523 unsigned long con_flag); 524 525void ceph_encode_my_addr(struct ceph_messenger *msgr); 526 527int ceph_tcp_connect(struct ceph_connection *con); 528int ceph_con_close_socket(struct ceph_connection *con); 529void ceph_con_reset_session(struct ceph_connection *con); 530 531u32 ceph_get_global_seq(struct ceph_messenger *msgr, u32 gt); 532void ceph_con_discard_sent(struct ceph_connection *con, u64 ack_seq); 533void ceph_con_discard_requeued(struct ceph_connection *con, u64 reconnect_seq); 534 535void ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor, 536 struct ceph_msg *msg, size_t length); 537struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor, 538 size_t *page_offset, size_t *length); 539void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, size_t bytes); 540 541u32 ceph_crc32c_page(u32 crc, struct page *page, unsigned int page_offset, 542 unsigned int length); 543 544bool ceph_addr_is_blank(const struct ceph_entity_addr *addr); 545int ceph_addr_port(const struct ceph_entity_addr *addr); 546void ceph_addr_set_port(struct ceph_entity_addr *addr, int p); 547 548void ceph_con_process_message(struct ceph_connection *con); 549int ceph_con_in_msg_alloc(struct ceph_connection *con, 550 struct ceph_msg_header *hdr, int *skip); 551void ceph_con_get_out_msg(struct ceph_connection *con); 552 553/* messenger_v1.c */ 554int ceph_con_v1_try_read(struct ceph_connection *con); 555int ceph_con_v1_try_write(struct ceph_connection *con); 556void ceph_con_v1_revoke(struct ceph_connection *con); 557void ceph_con_v1_revoke_incoming(struct ceph_connection *con); 558bool ceph_con_v1_opened(struct ceph_connection *con); 559void ceph_con_v1_reset_session(struct ceph_connection *con); 560void ceph_con_v1_reset_protocol(struct ceph_connection *con); 561 562/* messenger_v2.c */ 563int ceph_con_v2_try_read(struct ceph_connection *con); 564int ceph_con_v2_try_write(struct ceph_connection *con); 565void ceph_con_v2_revoke(struct ceph_connection *con); 566void ceph_con_v2_revoke_incoming(struct ceph_connection *con); 567bool ceph_con_v2_opened(struct ceph_connection *con); 568void ceph_con_v2_reset_session(struct ceph_connection *con); 569void ceph_con_v2_reset_protocol(struct ceph_connection *con); 570 571 572extern const char *ceph_pr_addr(const struct ceph_entity_addr *addr); 573 574extern int ceph_parse_ips(const char *c, const char *end, 575 struct ceph_entity_addr *addr, 576 int max_count, int *count, char delim); 577 578extern int ceph_msgr_init(void); 579extern void ceph_msgr_exit(void); 580extern void ceph_msgr_flush(void); 581 582extern void ceph_messenger_init(struct ceph_messenger *msgr, 583 struct ceph_entity_addr *myaddr); 584extern void ceph_messenger_fini(struct ceph_messenger *msgr); 585extern void ceph_messenger_reset_nonce(struct ceph_messenger *msgr); 586 587extern void ceph_con_init(struct ceph_connection *con, void *private, 588 const struct ceph_connection_operations *ops, 589 struct ceph_messenger *msgr); 590extern void ceph_con_open(struct ceph_connection *con, 591 __u8 entity_type, __u64 entity_num, 592 struct ceph_entity_addr *addr); 593extern bool ceph_con_opened(struct ceph_connection *con); 594extern void ceph_con_close(struct ceph_connection *con); 595extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg); 596 597extern void ceph_msg_revoke(struct ceph_msg *msg); 598extern void ceph_msg_revoke_incoming(struct ceph_msg *msg); 599 600extern void ceph_con_keepalive(struct ceph_connection *con); 601extern bool ceph_con_keepalive_expired(struct ceph_connection *con, 602 unsigned long interval); 603 604void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages, 605 size_t length, size_t alignment, bool own_pages); 606extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg, 607 struct ceph_pagelist *pagelist); 608#ifdef CONFIG_BLOCK 609void ceph_msg_data_add_bio(struct ceph_msg *msg, struct ceph_bio_iter *bio_pos, 610 u32 length); 611#endif /* CONFIG_BLOCK */ 612void ceph_msg_data_add_bvecs(struct ceph_msg *msg, 613 struct ceph_bvec_iter *bvec_pos); 614void ceph_msg_data_add_iter(struct ceph_msg *msg, 615 struct iov_iter *iter); 616 617struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items, 618 gfp_t flags, bool can_fail); 619extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags, 620 bool can_fail); 621 622extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg); 623extern void ceph_msg_put(struct ceph_msg *msg); 624 625extern void ceph_msg_dump(struct ceph_msg *msg); 626 627#endif 628