diff options
Diffstat (limited to 'include/linux/ceph/messenger.h')
| -rw-r--r-- | include/linux/ceph/messenger.h | 303 |
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 |