forked from luck/tmp_suning_uos_patched
c5c6b19d4b
The alignment used for reading data into or out of pages used to be taken from the data_off field in the message header. This only worked as long as the page alignment matched the object offset, breaking direct io to non-page aligned offsets. Instead, explicitly specify the page alignment next to the page vector in the ceph_msg struct, and use that instead of the message header (which probably shouldn't be trusted). The alloc_msg callback is responsible for filling in this field properly when it sets up the page vector. Signed-off-by: Sage Weil <sage@newdream.net>
263 lines
8.5 KiB
C
263 lines
8.5 KiB
C
#ifndef __FS_CEPH_MESSENGER_H
|
|
#define __FS_CEPH_MESSENGER_H
|
|
|
|
#include <linux/kref.h>
|
|
#include <linux/mutex.h>
|
|
#include <linux/net.h>
|
|
#include <linux/radix-tree.h>
|
|
#include <linux/uio.h>
|
|
#include <linux/version.h>
|
|
#include <linux/workqueue.h>
|
|
|
|
#include "types.h"
|
|
#include "buffer.h"
|
|
|
|
struct ceph_msg;
|
|
struct ceph_connection;
|
|
|
|
extern struct workqueue_struct *ceph_msgr_wq; /* receive work queue */
|
|
|
|
/*
|
|
* 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 */
|
|
int (*get_authorizer) (struct ceph_connection *con,
|
|
void **buf, int *len, int *proto,
|
|
void **reply_buf, int *reply_len, int force_new);
|
|
int (*verify_authorizer_reply) (struct ceph_connection *con, int len);
|
|
int (*invalidate_authorizer)(struct ceph_connection *con);
|
|
|
|
/* protocol version mismatch */
|
|
void (*bad_proto) (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);
|
|
};
|
|
|
|
/* 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;
|
|
struct page *zero_page; /* used in certain error cases */
|
|
|
|
bool nocrc;
|
|
|
|
/*
|
|
* 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;
|
|
|
|
u32 supported_features;
|
|
u32 required_features;
|
|
};
|
|
|
|
/*
|
|
* 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 */
|
|
struct ceph_msg_footer footer; /* footer */
|
|
struct kvec front; /* unaligned blobs of message */
|
|
struct ceph_buffer *middle;
|
|
struct page **pages; /* data payload. NOT OWNER. */
|
|
unsigned nr_pages; /* size of page array */
|
|
unsigned page_alignment; /* io offset in first page */
|
|
struct ceph_pagelist *pagelist; /* instead of pages */
|
|
struct list_head list_head;
|
|
struct kref kref;
|
|
struct bio *bio; /* instead of pages/pagelist */
|
|
struct bio *bio_iter; /* bio iterator */
|
|
int bio_seg; /* current bio segment */
|
|
struct ceph_pagelist *trail; /* the trailing part of the data */
|
|
bool front_is_vmalloc;
|
|
bool more_to_follow;
|
|
bool needs_out_seq;
|
|
int front_max;
|
|
|
|
struct ceph_msgpool *pool;
|
|
};
|
|
|
|
struct ceph_msg_pos {
|
|
int page, page_pos; /* which page; offset in page */
|
|
int data_pos; /* offset in data payload */
|
|
int did_page_crc; /* true if we've calculated crc for current page */
|
|
};
|
|
|
|
/* ceph connection fault delay defaults, for exponential backoff */
|
|
#define BASE_DELAY_INTERVAL (HZ/2)
|
|
#define MAX_DELAY_INTERVAL (5 * 60 * HZ)
|
|
|
|
/*
|
|
* ceph_connection state bit flags
|
|
*
|
|
* QUEUED and BUSY are used together to ensure that only a single
|
|
* thread is currently opening, reading or writing data to the socket.
|
|
*/
|
|
#define LOSSYTX 0 /* we can close channel or drop messages on errors */
|
|
#define CONNECTING 1
|
|
#define NEGOTIATING 2
|
|
#define KEEPALIVE_PENDING 3
|
|
#define WRITE_PENDING 4 /* we have data ready to send */
|
|
#define QUEUED 5 /* there is work queued on this connection */
|
|
#define BUSY 6 /* work is being done */
|
|
#define STANDBY 8 /* no outgoing messages, socket closed. we keep
|
|
* the ceph_connection around to maintain shared
|
|
* state with the peer. */
|
|
#define CLOSED 10 /* we've closed the connection */
|
|
#define SOCK_CLOSED 11 /* socket state changed to closed */
|
|
#define OPENING 13 /* open connection w/ (possibly new) peer */
|
|
#define DEAD 14 /* dead, about to kfree */
|
|
|
|
/*
|
|
* 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;
|
|
atomic_t nref;
|
|
|
|
const struct ceph_connection_operations *ops;
|
|
|
|
struct ceph_messenger *msgr;
|
|
struct socket *sock;
|
|
unsigned long state; /* connection state (see flags above) */
|
|
const char *error_msg; /* error message, if any */
|
|
|
|
struct ceph_entity_addr peer_addr; /* peer address */
|
|
struct ceph_entity_name peer_name; /* peer name */
|
|
struct ceph_entity_addr peer_addr_for_me;
|
|
unsigned 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 */
|
|
bool out_keepalive_pending;
|
|
|
|
u64 in_seq, in_seq_acked; /* last message received, acked */
|
|
|
|
/* connection negotiation temps */
|
|
char in_banner[CEPH_BANNER_MAX_LEN];
|
|
union {
|
|
struct { /* outgoing connection */
|
|
struct ceph_msg_connect out_connect;
|
|
struct ceph_msg_connect_reply in_reply;
|
|
};
|
|
struct { /* incoming */
|
|
struct ceph_msg_connect in_connect;
|
|
struct ceph_msg_connect_reply out_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 ceph_msg_pos out_msg_pos;
|
|
|
|
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;
|
|
struct ceph_msg_pos in_msg_pos;
|
|
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 struct ceph_messenger *ceph_messenger_create(
|
|
struct ceph_entity_addr *myaddr,
|
|
u32 features, u32 required);
|
|
extern void ceph_messenger_destroy(struct ceph_messenger *);
|
|
|
|
extern void ceph_con_init(struct ceph_messenger *msgr,
|
|
struct ceph_connection *con);
|
|
extern void ceph_con_open(struct ceph_connection *con,
|
|
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_con_revoke(struct ceph_connection *con, struct ceph_msg *msg);
|
|
extern void ceph_con_revoke_message(struct ceph_connection *con,
|
|
struct ceph_msg *msg);
|
|
extern void ceph_con_keepalive(struct ceph_connection *con);
|
|
extern struct ceph_connection *ceph_con_get(struct ceph_connection *con);
|
|
extern void ceph_con_put(struct ceph_connection *con);
|
|
|
|
extern struct ceph_msg *ceph_msg_new(int type, int front_len, gfp_t flags);
|
|
extern void ceph_msg_kfree(struct ceph_msg *m);
|
|
|
|
|
|
static inline struct ceph_msg *ceph_msg_get(struct ceph_msg *msg)
|
|
{
|
|
kref_get(&msg->kref);
|
|
return msg;
|
|
}
|
|
extern void ceph_msg_last_put(struct kref *kref);
|
|
static inline void ceph_msg_put(struct ceph_msg *msg)
|
|
{
|
|
kref_put(&msg->kref, ceph_msg_last_put);
|
|
}
|
|
|
|
extern void ceph_msg_dump(struct ceph_msg *msg);
|
|
|
|
#endif
|