messenger.h

  1/* SPDX-License-Identifier: GPL-2.0 */
  2#ifndef __FS_CEPH_MESSENGER_H
  3#define __FS_CEPH_MESSENGER_H
  4
  5#include <crypto/sha2.h>
  6#include <linux/bvec.h>
  7#include <linux/crypto.h>
  8#include <linux/kref.h>
  9#include <linux/mutex.h>
 10#include <linux/net.h>
 11#include <linux/radix-tree.h>
 12#include <linux/uio.h>
 13#include <linux/workqueue.h>
 14#include <net/net_namespace.h>
 15
 16#include <linux/ceph/types.h>
 17#include <linux/ceph/buffer.h>
 18
 19struct ceph_msg;
 20struct ceph_connection;
 21struct ceph_msg_data_cursor;
 22
 23/*
 24 * Ceph defines these callbacks for handling connection events.
 25 */
 26struct ceph_connection_operations {
 27	struct ceph_connection *(*get)(struct ceph_connection *);
 28	void (*put)(struct ceph_connection *);
 29
 30	/* handle an incoming message. */
 31	void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
 32
 33	/* authorize an outgoing connection */
 34	struct ceph_auth_handshake *(*get_authorizer) (
 35				struct ceph_connection *con,
 36			       int *proto, int force_new);
 37	int (*add_authorizer_challenge)(struct ceph_connection *con,
 38					void *challenge_buf,
 39					int challenge_buf_len);
 40	int (*verify_authorizer_reply) (struct ceph_connection *con);
 41	int (*invalidate_authorizer)(struct ceph_connection *con);
 42
 43	/* there was some error on the socket (disconnect, whatever) */
 44	void (*fault) (struct ceph_connection *con);
 45
 46	/* a remote host as terminated a message exchange session, and messages
 47	 * we sent (or they tried to send us) may be lost. */
 48	void (*peer_reset) (struct ceph_connection *con);
 49
 50	struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
 51					struct ceph_msg_header *hdr,
 52					int *skip);
 53
 54	void (*reencode_message) (struct ceph_msg *msg);
 55
 56	int (*sign_message) (struct ceph_msg *msg);
 57	int (*check_message_signature) (struct ceph_msg *msg);
 58
 59	/* msgr2 authentication exchange */
 60	int (*get_auth_request)(struct ceph_connection *con,
 61				void *buf, int *buf_len,
 62				void **authorizer, int *authorizer_len);
 63	int (*handle_auth_reply_more)(struct ceph_connection *con,
 64				      void *reply, int reply_len,
 65				      void *buf, int *buf_len,
 66				      void **authorizer, int *authorizer_len);
 67	int (*handle_auth_done)(struct ceph_connection *con,
 68				u64 global_id, void *reply, int reply_len,
 69				u8 *session_key, int *session_key_len,
 70				u8 *con_secret, int *con_secret_len);
 71	int (*handle_auth_bad_method)(struct ceph_connection *con,
 72				      int used_proto, int result,
 73				      const int *allowed_protos, int proto_cnt,
 74				      const int *allowed_modes, int mode_cnt);
 75
 76	/**
 77	 * sparse_read: read sparse data
 78	 * @con: connection we're reading from
 79	 * @cursor: data cursor for reading extents
 80	 * @buf: optional buffer to read into
 81	 *
 82	 * This should be called more than once, each time setting up to
 83	 * receive an extent into the current cursor position, and zeroing
 84	 * the holes between them.
 85	 *
 86	 * Returns amount of data to be read (in bytes), 0 if reading is
 87	 * complete, or -errno if there was an error.
 88	 *
 89	 * If @buf is set on a >0 return, then the data should be read into
 90	 * the provided buffer. Otherwise, it should be read into the cursor.
 91	 *
 92	 * The sparse read operation is expected to initialize the cursor
 93	 * with a length covering up to the end of the last extent.
 94	 */
 95	int (*sparse_read)(struct ceph_connection *con,
 96			   struct ceph_msg_data_cursor *cursor,
 97			   char **buf);
 98
 99};
100
101/* use format string %s%lld */
102#define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
103
104struct ceph_messenger {
105	struct ceph_entity_inst inst;    /* my name+address */
106	struct ceph_entity_addr my_enc_addr;
107
108	atomic_t stopping;
109	possible_net_t net;
110
111	/*
112	 * the global_seq counts connections i (attempt to) initiate
113	 * in order to disambiguate certain connect race conditions.
114	 */
115	u32 global_seq;
116	spinlock_t global_seq_lock;
117};
118
119enum ceph_msg_data_type {
120	CEPH_MSG_DATA_NONE,	/* message contains no data payload */
121	CEPH_MSG_DATA_PAGES,	/* data source/destination is a page array */
122	CEPH_MSG_DATA_PAGELIST,	/* data source/destination is a pagelist */
123#ifdef CONFIG_BLOCK
124	CEPH_MSG_DATA_BIO,	/* data source/destination is a bio list */
125#endif /* CONFIG_BLOCK */
126	CEPH_MSG_DATA_BVECS,	/* data source/destination is a bio_vec array */
127	CEPH_MSG_DATA_ITER,	/* data source/destination is an iov_iter */
128};
129
130#ifdef CONFIG_BLOCK
131
132struct ceph_bio_iter {
133	struct bio *bio;
134	struct bvec_iter iter;
135};
136
137#define __ceph_bio_iter_advance_step(it, n, STEP) do {			      \
138	unsigned int __n = (n), __cur_n;				      \
139									      \
140	while (__n) {							      \
141		BUG_ON(!(it)->iter.bi_size);				      \
142		__cur_n = min((it)->iter.bi_size, __n);			      \
143		(void)(STEP);						      \
144		bio_advance_iter((it)->bio, &(it)->iter, __cur_n);	      \
145		if (!(it)->iter.bi_size && (it)->bio->bi_next) {	      \
146			dout("__ceph_bio_iter_advance_step next bio\n");      \
147			(it)->bio = (it)->bio->bi_next;			      \
148			(it)->iter = (it)->bio->bi_iter;		      \
149		}							      \
150		__n -= __cur_n;						      \
151	}								      \
152} while (0)
153
154/*
155 * Advance @it by @n bytes.
156 */
157#define ceph_bio_iter_advance(it, n)					      \
158	__ceph_bio_iter_advance_step(it, n, 0)
159
160/*
161 * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
162 */
163#define ceph_bio_iter_advance_step(it, n, BVEC_STEP)			      \
164	__ceph_bio_iter_advance_step(it, n, ({				      \
165		struct bio_vec bv;					      \
166		struct bvec_iter __cur_iter;				      \
167									      \
168		__cur_iter = (it)->iter;				      \
169		__cur_iter.bi_size = __cur_n;				      \
170		__bio_for_each_segment(bv, (it)->bio, __cur_iter, __cur_iter) \
171			(void)(BVEC_STEP);				      \
172	}))
173
174#endif /* CONFIG_BLOCK */
175
176struct ceph_bvec_iter {
177	struct bio_vec *bvecs;
178	struct bvec_iter iter;
179};
180
181#define __ceph_bvec_iter_advance_step(it, n, STEP) do {			      \
182	BUG_ON((n) > (it)->iter.bi_size);				      \
183	(void)(STEP);							      \
184	bvec_iter_advance((it)->bvecs, &(it)->iter, (n));		      \
185} while (0)
186
187/*
188 * Advance @it by @n bytes.
189 */
190#define ceph_bvec_iter_advance(it, n)					      \
191	__ceph_bvec_iter_advance_step(it, n, 0)
192
193/*
194 * Advance @it by @n bytes, executing BVEC_STEP for each bio_vec.
195 */
196#define ceph_bvec_iter_advance_step(it, n, BVEC_STEP)			      \
197	__ceph_bvec_iter_advance_step(it, n, ({				      \
198		struct bio_vec bv;					      \
199		struct bvec_iter __cur_iter;				      \
200									      \
201		__cur_iter = (it)->iter;				      \
202		__cur_iter.bi_size = (n);				      \
203		for_each_bvec(bv, (it)->bvecs, __cur_iter, __cur_iter)	      \
204			(void)(BVEC_STEP);				      \
205	}))
206
207#define ceph_bvec_iter_shorten(it, n) do {				      \
208	BUG_ON((n) > (it)->iter.bi_size);				      \
209	(it)->iter.bi_size = (n);					      \
210} while (0)
211
212struct ceph_msg_data {
213	enum ceph_msg_data_type		type;
214	union {
215#ifdef CONFIG_BLOCK
216		struct {
217			struct ceph_bio_iter	bio_pos;
218			u32			bio_length;
219		};
220#endif /* CONFIG_BLOCK */
221		struct ceph_bvec_iter	bvec_pos;
222		struct {
223			struct page	**pages;
224			size_t		length;		/* total # bytes */
225			unsigned int	alignment;	/* first page */
226			bool		own_pages;
227		};
228		struct ceph_pagelist	*pagelist;
229		struct iov_iter		iter;
230	};
231};
232
233struct ceph_msg_data_cursor {
234	size_t			total_resid;	/* across all data items */
235
236	struct ceph_msg_data	*data;		/* current data item */
237	size_t			resid;		/* bytes not yet consumed */
238	int			sr_resid;	/* residual sparse_read len */
239	bool			need_crc;	/* crc update needed */
240	union {
241#ifdef CONFIG_BLOCK
242		struct ceph_bio_iter	bio_iter;
243#endif /* CONFIG_BLOCK */
244		struct bvec_iter	bvec_iter;
245		struct {				/* pages */
246			unsigned int	page_offset;	/* offset in page */
247			unsigned short	page_index;	/* index in array */
248			unsigned short	page_count;	/* pages in array */
249		};
250		struct {				/* pagelist */
251			struct page	*page;		/* page from list */
252			size_t		offset;		/* bytes from list */
253		};
254		struct {
255			struct iov_iter		iov_iter;
256			unsigned int		lastlen;
257		};
258	};
259};
260
261/*
262 * a single message.  it contains a header (src, dest, message type, etc.),
263 * footer (crc values, mainly), a "front" message body, and possibly a
264 * data payload (stored in some number of pages).
265 */
266struct ceph_msg {
267	struct ceph_msg_header hdr;	/* header */
268	union {
269		struct ceph_msg_footer footer;		/* footer */
270		struct ceph_msg_footer_old old_footer;	/* old format footer */
271	};
272	struct kvec front;              /* unaligned blobs of message */
273	struct ceph_buffer *middle;
274
275	size_t				data_length;
276	struct ceph_msg_data		*data;
277	int				num_data_items;
278	int				max_data_items;
279	struct ceph_msg_data_cursor	cursor;
280
281	struct ceph_connection *con;
282	struct list_head list_head;	/* links for connection lists */
283
284	struct kref kref;
285	bool more_to_follow;
286	bool needs_out_seq;
287	u64 sparse_read_total;
288	int front_alloc_len;
289
290	struct ceph_msgpool *pool;
291};
292
293/*
294 * connection states
295 */
296#define CEPH_CON_S_CLOSED		1
297#define CEPH_CON_S_PREOPEN		2
298#define CEPH_CON_S_V1_BANNER		3
299#define CEPH_CON_S_V1_CONNECT_MSG	4
300#define CEPH_CON_S_V2_BANNER_PREFIX	5
301#define CEPH_CON_S_V2_BANNER_PAYLOAD	6
302#define CEPH_CON_S_V2_HELLO		7
303#define CEPH_CON_S_V2_AUTH		8
304#define CEPH_CON_S_V2_AUTH_SIGNATURE	9
305#define CEPH_CON_S_V2_SESSION_CONNECT	10
306#define CEPH_CON_S_V2_SESSION_RECONNECT	11
307#define CEPH_CON_S_OPEN			12
308#define CEPH_CON_S_STANDBY		13
309
310/*
311 * ceph_connection flag bits
312 */
313#define CEPH_CON_F_LOSSYTX		0  /* we can close channel or drop
314					      messages on errors */
315#define CEPH_CON_F_KEEPALIVE_PENDING	1  /* we need to send a keepalive */
316#define CEPH_CON_F_WRITE_PENDING	2  /* we have data ready to send */
317#define CEPH_CON_F_SOCK_CLOSED		3  /* socket state changed to closed */
318#define CEPH_CON_F_BACKOFF		4  /* need to retry queuing delayed
319					      work */
320
321/* ceph connection fault delay defaults, for exponential backoff */
322#define BASE_DELAY_INTERVAL	(HZ / 4)
323#define MAX_DELAY_INTERVAL	(15 * HZ)
324
325struct ceph_connection_v1_info {
326	struct kvec out_kvec[8],         /* sending header/footer data */
327		*out_kvec_cur;
328	int out_kvec_left;   /* kvec's left in out_kvec */
329	int out_skip;        /* skip this many bytes */
330	int out_kvec_bytes;  /* total bytes left */
331	bool out_more;       /* there is more data after the kvecs */
332	bool out_msg_done;
333
334	struct ceph_auth_handshake *auth;
335	int auth_retry;       /* true if we need a newer authorizer */
336
337	/* connection negotiation temps */
338	u8 in_banner[CEPH_BANNER_MAX_LEN];
339	struct ceph_entity_addr actual_peer_addr;
340	struct ceph_entity_addr peer_addr_for_me;
341	struct ceph_msg_connect out_connect;
342	struct ceph_msg_connect_reply in_reply;
343
344	int in_base_pos;     /* bytes read */
345
346	/* sparse reads */
347	struct kvec in_sr_kvec; /* current location to receive into */
348	u64 in_sr_len;		/* amount of data in this extent */
349
350	/* message in temps */
351	u8 in_tag;           /* protocol control byte */
352	struct ceph_msg_header in_hdr;
353	__le64 in_temp_ack;  /* for reading an ack */
354
355	/* message out temps */
356	struct ceph_msg_header out_hdr;
357	__le64 out_temp_ack;  /* for writing an ack */
358	struct ceph_timespec out_temp_keepalive2;  /* for writing keepalive2
359						      stamp */
360
361	u32 connect_seq;      /* identify the most recent connection
362				 attempt for this session */
363	u32 peer_global_seq;  /* peer's global seq for this connection */
364};
365
366#define CEPH_CRC_LEN			4
367#define CEPH_GCM_KEY_LEN		16
368#define CEPH_GCM_IV_LEN			sizeof(struct ceph_gcm_nonce)
369#define CEPH_GCM_BLOCK_LEN		16
370#define CEPH_GCM_TAG_LEN		16
371
372#define CEPH_PREAMBLE_LEN		32
373#define CEPH_PREAMBLE_INLINE_LEN	48
374#define CEPH_PREAMBLE_PLAIN_LEN		CEPH_PREAMBLE_LEN
375#define CEPH_PREAMBLE_SECURE_LEN	(CEPH_PREAMBLE_LEN +		\
376					 CEPH_PREAMBLE_INLINE_LEN +	\
377					 CEPH_GCM_TAG_LEN)
378#define CEPH_EPILOGUE_PLAIN_LEN		(1 + 3 * CEPH_CRC_LEN)
379#define CEPH_EPILOGUE_SECURE_LEN	(CEPH_GCM_BLOCK_LEN + CEPH_GCM_TAG_LEN)
380
381#define CEPH_FRAME_MAX_SEGMENT_COUNT	4
382
383struct ceph_frame_desc {
384	int fd_tag;  /* FRAME_TAG_* */
385	int fd_seg_cnt;
386	int fd_lens[CEPH_FRAME_MAX_SEGMENT_COUNT];  /* logical */
387	int fd_aligns[CEPH_FRAME_MAX_SEGMENT_COUNT];
388};
389
390struct ceph_gcm_nonce {
391	__le32 fixed;
392	__le64 counter __packed;
393};
394
395struct ceph_connection_v2_info {
396	struct iov_iter in_iter;
397	struct kvec in_kvecs[5];  /* recvmsg */
398	struct bio_vec in_bvec;  /* recvmsg (in_cursor) */
399	int in_kvec_cnt;
400	int in_state;  /* IN_S_* */
401
402	struct iov_iter out_iter;
403	struct kvec out_kvecs[8];  /* sendmsg */
404	struct bio_vec out_bvec;  /* sendpage (out_cursor, out_zero),
405				     sendmsg (out_enc_pages) */
406	int out_kvec_cnt;
407	int out_state;  /* OUT_S_* */
408
409	int out_zero;  /* # of zero bytes to send */
410	bool out_iter_sendpage;  /* use sendpage if possible */
411
412	struct ceph_frame_desc in_desc;
413	struct ceph_msg_data_cursor in_cursor;
414	struct ceph_msg_data_cursor out_cursor;
415
416	struct hmac_sha256_key hmac_key;  /* post-auth signature */
417	bool hmac_key_set;
418	struct crypto_aead *gcm_tfm;  /* on-wire encryption */
419	struct aead_request *gcm_req;
420	struct crypto_wait gcm_wait;
421	struct ceph_gcm_nonce in_gcm_nonce;
422	struct ceph_gcm_nonce out_gcm_nonce;
423
424	struct page **in_enc_pages;
425	int in_enc_page_cnt;
426	int in_enc_resid;
427	int in_enc_i;
428	struct page **out_enc_pages;
429	int out_enc_page_cnt;
430	int out_enc_resid;
431	int out_enc_i;
432
433	int con_mode;  /* CEPH_CON_MODE_* */
434
435	void *conn_bufs[16];
436	int conn_buf_cnt;
437	int data_len_remain;
438
439	struct kvec in_sign_kvecs[8];
440	struct kvec out_sign_kvecs[8];
441	int in_sign_kvec_cnt;
442	int out_sign_kvec_cnt;
443
444	u64 client_cookie;
445	u64 server_cookie;
446	u64 global_seq;
447	u64 connect_seq;
448	u64 peer_global_seq;
449
450	u8 in_buf[CEPH_PREAMBLE_SECURE_LEN];
451	u8 out_buf[CEPH_PREAMBLE_SECURE_LEN];
452	struct {
453		u8 late_status;  /* FRAME_LATE_STATUS_* */
454		union {
455			struct {
456				u32 front_crc;
457				u32 middle_crc;
458				u32 data_crc;
459			} __packed;
460			u8 pad[CEPH_GCM_BLOCK_LEN - 1];
461		};
462	} out_epil;
463};
464
465/*
466 * A single connection with another host.
467 *
468 * We maintain a queue of outgoing messages, and some session state to
469 * ensure that we can preserve the lossless, ordered delivery of
470 * messages in the case of a TCP disconnect.
471 */
472struct ceph_connection {
473	void *private;
474
475	const struct ceph_connection_operations *ops;
476
477	struct ceph_messenger *msgr;
478
479	int state;  /* CEPH_CON_S_* */
480	atomic_t sock_state;
481	struct socket *sock;
482
483	unsigned long flags;  /* CEPH_CON_F_* */
484	const char *error_msg;  /* error message, if any */
485
486	struct ceph_entity_name peer_name; /* peer name */
487	struct ceph_entity_addr peer_addr; /* peer address */
488	u64 peer_features;
489
490	struct mutex mutex;
491
492	/* out queue */
493	struct list_head out_queue;
494	struct list_head out_sent;   /* sending or sent but unacked */
495	u64 out_seq;		     /* last message queued for send */
496
497	u64 in_seq, in_seq_acked;  /* last message received, acked */
498
499	struct ceph_msg *in_msg;
500	struct ceph_msg *out_msg;        /* sending message (== tail of
501					    out_sent) */
502
503	struct page *bounce_page;
504	u32 in_front_crc, in_middle_crc, in_data_crc;  /* calculated crc */
505
506	struct timespec64 last_keepalive_ack; /* keepalive2 ack stamp */
507
508	struct delayed_work work;	    /* send|recv work */
509	unsigned long       delay;          /* current delay interval */
510
511	union {
512		struct ceph_connection_v1_info v1;
513		struct ceph_connection_v2_info v2;
514	};
515};
516
517extern struct page *ceph_zero_page;
518
519void ceph_con_flag_clear(struct ceph_connection *con, unsigned long con_flag);
520void ceph_con_flag_set(struct ceph_connection *con, unsigned long con_flag);
521bool ceph_con_flag_test(struct ceph_connection *con, unsigned long con_flag);
522bool ceph_con_flag_test_and_clear(struct ceph_connection *con,
523				  unsigned long con_flag);
524bool ceph_con_flag_test_and_set(struct ceph_connection *con,
525				unsigned long con_flag);
526
527void ceph_encode_my_addr(struct ceph_messenger *msgr);
528
529int ceph_tcp_connect(struct ceph_connection *con);
530int ceph_con_close_socket(struct ceph_connection *con);
531void ceph_con_reset_session(struct ceph_connection *con);
532
533u32 ceph_get_global_seq(struct ceph_messenger *msgr, u32 gt);
534void ceph_con_discard_sent(struct ceph_connection *con, u64 ack_seq);
535void ceph_con_discard_requeued(struct ceph_connection *con, u64 reconnect_seq);
536
537void ceph_msg_data_cursor_init(struct ceph_msg_data_cursor *cursor,
538			       struct ceph_msg *msg, size_t length);
539struct page *ceph_msg_data_next(struct ceph_msg_data_cursor *cursor,
540				size_t *page_offset, size_t *length);
541void ceph_msg_data_advance(struct ceph_msg_data_cursor *cursor, size_t bytes);
542
543u32 ceph_crc32c_page(u32 crc, struct page *page, unsigned int page_offset,
544		     unsigned int length);
545
546bool ceph_addr_is_blank(const struct ceph_entity_addr *addr);
547int ceph_addr_port(const struct ceph_entity_addr *addr);
548void ceph_addr_set_port(struct ceph_entity_addr *addr, int p);
549
550void ceph_con_process_message(struct ceph_connection *con);
551int ceph_con_in_msg_alloc(struct ceph_connection *con,
552			  struct ceph_msg_header *hdr, int *skip);
553struct ceph_msg *ceph_con_get_out_msg(struct ceph_connection *con);
554
555/* messenger_v1.c */
556int ceph_con_v1_try_read(struct ceph_connection *con);
557int ceph_con_v1_try_write(struct ceph_connection *con);
558void ceph_con_v1_revoke(struct ceph_connection *con, struct ceph_msg *msg);
559void ceph_con_v1_revoke_incoming(struct ceph_connection *con);
560bool ceph_con_v1_opened(struct ceph_connection *con);
561void ceph_con_v1_reset_session(struct ceph_connection *con);
562void ceph_con_v1_reset_protocol(struct ceph_connection *con);
563
564/* messenger_v2.c */
565int ceph_con_v2_try_read(struct ceph_connection *con);
566int ceph_con_v2_try_write(struct ceph_connection *con);
567void ceph_con_v2_revoke(struct ceph_connection *con, struct ceph_msg *msg);
568void ceph_con_v2_revoke_incoming(struct ceph_connection *con);
569bool ceph_con_v2_opened(struct ceph_connection *con);
570void ceph_con_v2_reset_session(struct ceph_connection *con);
571void ceph_con_v2_reset_protocol(struct ceph_connection *con);
572
573
574extern const char *ceph_pr_addr(const struct ceph_entity_addr *addr);
575
576extern int ceph_parse_ips(const char *c, const char *end,
577			  struct ceph_entity_addr *addr,
578			  int max_count, int *count, char delim);
579
580extern int ceph_msgr_init(void);
581extern void ceph_msgr_exit(void);
582extern void ceph_msgr_flush(void);
583
584extern void ceph_messenger_init(struct ceph_messenger *msgr,
585				struct ceph_entity_addr *myaddr);
586extern void ceph_messenger_fini(struct ceph_messenger *msgr);
587extern void ceph_messenger_reset_nonce(struct ceph_messenger *msgr);
588
589extern void ceph_con_init(struct ceph_connection *con, void *private,
590			const struct ceph_connection_operations *ops,
591			struct ceph_messenger *msgr);
592extern void ceph_con_open(struct ceph_connection *con,
593			  __u8 entity_type, __u64 entity_num,
594			  struct ceph_entity_addr *addr);
595extern bool ceph_con_opened(struct ceph_connection *con);
596extern void ceph_con_close(struct ceph_connection *con);
597extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
598
599extern void ceph_msg_revoke(struct ceph_msg *msg);
600extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
601
602extern void ceph_con_keepalive(struct ceph_connection *con);
603extern bool ceph_con_keepalive_expired(struct ceph_connection *con,
604				       unsigned long interval);
605
606void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
607			     size_t length, size_t alignment, bool own_pages);
608extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
609				struct ceph_pagelist *pagelist);
610#ifdef CONFIG_BLOCK
611void ceph_msg_data_add_bio(struct ceph_msg *msg, struct ceph_bio_iter *bio_pos,
612			   u32 length);
613#endif /* CONFIG_BLOCK */
614void ceph_msg_data_add_bvecs(struct ceph_msg *msg,
615			     struct ceph_bvec_iter *bvec_pos);
616void ceph_msg_data_add_iter(struct ceph_msg *msg,
617			    struct iov_iter *iter);
618
619struct ceph_msg *ceph_msg_new2(int type, int front_len, int max_data_items,
620			       gfp_t flags, bool can_fail);
621extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
622				     bool can_fail);
623
624extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg);
625extern void ceph_msg_put(struct ceph_msg *msg);
626
627extern void ceph_msg_dump(struct ceph_msg *msg);
628
629#endif