1 files changed, 303 insertions, 0 deletions
diff --git a/include/linux/ceph/messenger.h b/include/linux/ceph/messenger.h
new file mode 100644
index 000000000..e15499422
--- /dev/null
+++ b/include/linux/ceph/messenger.h
@@ -0,0 +1,303 @@
+#ifndef __FS_CEPH_MESSENGER_H
+#define __FS_CEPH_MESSENGER_H
+
+#include <linux/blk_types.h>
+#include <linux/kref.h>
+#include <linux/mutex.h>
+#include <linux/net.h>
+#include <linux/radix-tree.h>
+#include <linux/uio.h>
+#include <linux/workqueue.h>
+
+#include <linux/ceph/types.h>
+#include <linux/ceph/buffer.h>
+
+struct ceph_msg;
+struct ceph_connection;
+
+/*
+ * Ceph defines these callbacks for handling connection events.
+ */
+struct ceph_connection_operations {
+	struct ceph_connection *(*get)(struct ceph_connection *);
+	void (*put)(struct ceph_connection *);
+
+	/* handle an incoming message. */
+	void (*dispatch) (struct ceph_connection *con, struct ceph_msg *m);
+
+	/* authorize an outgoing connection */
+	struct ceph_auth_handshake *(*get_authorizer) (
+				struct ceph_connection *con,
+			       int *proto, int force_new);
+	int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
+	int (*invalidate_authorizer)(struct ceph_connection *con);
+
+	/* there was some error on the socket (disconnect, whatever) */
+	void (*fault) (struct ceph_connection *con);
+
+	/* a remote host as terminated a message exchange session, and messages
+	 * we sent (or they tried to send us) may be lost. */
+	void (*peer_reset) (struct ceph_connection *con);
+
+	struct ceph_msg * (*alloc_msg) (struct ceph_connection *con,
+					struct ceph_msg_header *hdr,
+					int *skip);
+	int (*sign_message) (struct ceph_connection *con, struct ceph_msg *msg);
+
+	int (*check_message_signature) (struct ceph_connection *con,
+					struct ceph_msg *msg);
+};
+
+/* use format string %s%d */
+#define ENTITY_NAME(n) ceph_entity_type_name((n).type), le64_to_cpu((n).num)
+
+struct ceph_messenger {
+	struct ceph_entity_inst inst;    /* my name+address */
+	struct ceph_entity_addr my_enc_addr;
+
+	atomic_t stopping;
+	bool nocrc;
+	bool tcp_nodelay;
+
+	/*
+	 * the global_seq counts connections i (attempt to) initiate
+	 * in order to disambiguate certain connect race conditions.
+	 */
+	u32 global_seq;
+	spinlock_t global_seq_lock;
+
+	u64 supported_features;
+	u64 required_features;
+};
+
+enum ceph_msg_data_type {
+	CEPH_MSG_DATA_NONE,	/* message contains no data payload */
+	CEPH_MSG_DATA_PAGES,	/* data source/destination is a page array */
+	CEPH_MSG_DATA_PAGELIST,	/* data source/destination is a pagelist */
+#ifdef CONFIG_BLOCK
+	CEPH_MSG_DATA_BIO,	/* data source/destination is a bio list */
+#endif /* CONFIG_BLOCK */
+};
+
+static __inline__ bool ceph_msg_data_type_valid(enum ceph_msg_data_type type)
+{
+	switch (type) {
+	case CEPH_MSG_DATA_NONE:
+	case CEPH_MSG_DATA_PAGES:
+	case CEPH_MSG_DATA_PAGELIST:
+#ifdef CONFIG_BLOCK
+	case CEPH_MSG_DATA_BIO:
+#endif /* CONFIG_BLOCK */
+		return true;
+	default:
+		return false;
+	}
+}
+
+struct ceph_msg_data {
+	struct list_head		links;	/* ceph_msg->data */
+	enum ceph_msg_data_type		type;
+	union {
+#ifdef CONFIG_BLOCK
+		struct {
+			struct bio	*bio;
+			size_t		bio_length;
+		};
+#endif /* CONFIG_BLOCK */
+		struct {
+			struct page	**pages;	/* NOT OWNER. */
+			size_t		length;		/* total # bytes */
+			unsigned int	alignment;	/* first page */
+		};
+		struct ceph_pagelist	*pagelist;
+	};
+};
+
+struct ceph_msg_data_cursor {
+	size_t			total_resid;	/* across all data items */
+	struct list_head	*data_head;	/* = &ceph_msg->data */
+
+	struct ceph_msg_data	*data;		/* current data item */
+	size_t			resid;		/* bytes not yet consumed */
+	bool			last_piece;	/* current is last piece */
+	bool			need_crc;	/* crc update needed */
+	union {
+#ifdef CONFIG_BLOCK
+		struct {				/* bio */
+			struct bio	*bio;		/* bio from list */
+			struct bvec_iter bvec_iter;
+		};
+#endif /* CONFIG_BLOCK */
+		struct {				/* pages */
+			unsigned int	page_offset;	/* offset in page */
+			unsigned short	page_index;	/* index in array */
+			unsigned short	page_count;	/* pages in array */
+		};
+		struct {				/* pagelist */
+			struct page	*page;		/* page from list */
+			size_t		offset;		/* bytes from list */
+		};
+	};
+};
+
+/*
+ * a single message.  it contains a header (src, dest, message type, etc.),
+ * footer (crc values, mainly), a "front" message body, and possibly a
+ * data payload (stored in some number of pages).
+ */
+struct ceph_msg {
+	struct ceph_msg_header hdr;	/* header */
+	union {
+		struct ceph_msg_footer footer;		/* footer */
+		struct ceph_msg_footer_old old_footer;	/* old format footer */
+	};
+	struct kvec front;              /* unaligned blobs of message */
+	struct ceph_buffer *middle;
+
+	size_t				data_length;
+	struct list_head		data;
+	struct ceph_msg_data_cursor	cursor;
+
+	struct ceph_connection *con;
+	struct list_head list_head;	/* links for connection lists */
+
+	struct kref kref;
+	bool more_to_follow;
+	bool needs_out_seq;
+	int front_alloc_len;
+	unsigned long ack_stamp;        /* tx: when we were acked */
+
+	struct ceph_msgpool *pool;
+};
+
+/* ceph connection fault delay defaults, for exponential backoff */
+#define BASE_DELAY_INTERVAL	(HZ/2)
+#define MAX_DELAY_INTERVAL	(5 * 60 * HZ)
+
+/*
+ * A single connection with another host.
+ *
+ * We maintain a queue of outgoing messages, and some session state to
+ * ensure that we can preserve the lossless, ordered delivery of
+ * messages in the case of a TCP disconnect.
+ */
+struct ceph_connection {
+	void *private;
+
+	const struct ceph_connection_operations *ops;
+
+	struct ceph_messenger *msgr;
+
+	atomic_t sock_state;
+	struct socket *sock;
+	struct ceph_entity_addr peer_addr; /* peer address */
+	struct ceph_entity_addr peer_addr_for_me;
+
+	unsigned long flags;
+	unsigned long state;
+	const char *error_msg;  /* error message, if any */
+
+	struct ceph_entity_name peer_name; /* peer name */
+
+	u64 peer_features;
+	u32 connect_seq;      /* identify the most recent connection
+				 attempt for this connection, client */
+	u32 peer_global_seq;  /* peer's global seq for this connection */
+
+	int auth_retry;       /* true if we need a newer authorizer */
+	void *auth_reply_buf;   /* where to put the authorizer reply */
+	int auth_reply_buf_len;
+
+	struct mutex mutex;
+
+	/* out queue */
+	struct list_head out_queue;
+	struct list_head out_sent;   /* sending or sent but unacked */
+	u64 out_seq;		     /* last message queued for send */
+
+	u64 in_seq, in_seq_acked;  /* last message received, acked */
+
+	/* connection negotiation temps */
+	char in_banner[CEPH_BANNER_MAX_LEN];
+	struct ceph_msg_connect out_connect;
+	struct ceph_msg_connect_reply in_reply;
+	struct ceph_entity_addr actual_peer_addr;
+
+	/* message out temps */
+	struct ceph_msg *out_msg;        /* sending message (== tail of
+					    out_sent) */
+	bool out_msg_done;
+
+	struct kvec out_kvec[8],         /* sending header/footer data */
+		*out_kvec_cur;
+	int out_kvec_left;   /* kvec's left in out_kvec */
+	int out_skip;        /* skip this many bytes */
+	int out_kvec_bytes;  /* total bytes left */
+	bool out_kvec_is_msg; /* kvec refers to out_msg */
+	int out_more;        /* there is more data after the kvecs */
+	__le64 out_temp_ack; /* for writing an ack */
+
+	/* message in temps */
+	struct ceph_msg_header in_hdr;
+	struct ceph_msg *in_msg;
+	u32 in_front_crc, in_middle_crc, in_data_crc;  /* calculated crc */
+
+	char in_tag;         /* protocol control byte */
+	int in_base_pos;     /* bytes read */
+	__le64 in_temp_ack;  /* for reading an ack */
+
+	struct delayed_work work;	    /* send|recv work */
+	unsigned long       delay;          /* current delay interval */
+};
+
+
+extern const char *ceph_pr_addr(const struct sockaddr_storage *ss);
+extern int ceph_parse_ips(const char *c, const char *end,
+			  struct ceph_entity_addr *addr,
+			  int max_count, int *count);
+
+
+extern int ceph_msgr_init(void);
+extern void ceph_msgr_exit(void);
+extern void ceph_msgr_flush(void);
+
+extern void ceph_messenger_init(struct ceph_messenger *msgr,
+			struct ceph_entity_addr *myaddr,
+			u64 supported_features,
+			u64 required_features,
+			bool nocrc,
+			bool tcp_nodelay);
+
+extern void ceph_con_init(struct ceph_connection *con, void *private,
+			const struct ceph_connection_operations *ops,
+			struct ceph_messenger *msgr);
+extern void ceph_con_open(struct ceph_connection *con,
+			  __u8 entity_type, __u64 entity_num,
+			  struct ceph_entity_addr *addr);
+extern bool ceph_con_opened(struct ceph_connection *con);
+extern void ceph_con_close(struct ceph_connection *con);
+extern void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg);
+
+extern void ceph_msg_revoke(struct ceph_msg *msg);
+extern void ceph_msg_revoke_incoming(struct ceph_msg *msg);
+
+extern void ceph_con_keepalive(struct ceph_connection *con);
+
+extern void ceph_msg_data_add_pages(struct ceph_msg *msg, struct page **pages,
+				size_t length, size_t alignment);
+extern void ceph_msg_data_add_pagelist(struct ceph_msg *msg,
+				struct ceph_pagelist *pagelist);
+#ifdef CONFIG_BLOCK
+extern void ceph_msg_data_add_bio(struct ceph_msg *msg, struct bio *bio,
+				size_t length);
+#endif /* CONFIG_BLOCK */
+
+extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags,
+				     bool can_fail);
+
+extern struct ceph_msg *ceph_msg_get(struct ceph_msg *msg);
+extern void ceph_msg_put(struct ceph_msg *msg);
+
+extern void ceph_msg_dump(struct ceph_msg *msg);
+
+#endif