[deliverable/linux.git] / include / linux / ceph / mon_client.h

#ifndef _FS_CEPH_MON_CLIENT_H
#define _FS_CEPH_MON_CLIENT_H

#include <linux/completion.h>
#include <linux/kref.h>
#include <linux/rbtree.h>

#include <linux/ceph/messenger.h>

struct ceph_client;
struct ceph_mount_args;
struct ceph_auth_client;

/*
 * The monitor map enumerates the set of all monitors.
 */
struct ceph_monmap {
	struct ceph_fsid fsid;
	u32 epoch;
	u32 num_mon;
	struct ceph_entity_inst mon_inst[0];
};

struct ceph_mon_client;
struct ceph_mon_generic_request;


/*
 * Generic mechanism for resending monitor requests.
 */
typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
					 int newmon);

/* a pending monitor request */
struct ceph_mon_request {
	struct ceph_mon_client *monc;
	struct delayed_work delayed_work;
	unsigned long delay;
	ceph_monc_request_func_t do_request;
};

typedef void (*ceph_monc_callback_t)(struct ceph_mon_generic_request *);

/*
 * ceph_mon_generic_request is being used for the statfs and
 * mon_get_version requests which are being done a bit differently
 * because we need to get data back to the caller
 */
struct ceph_mon_generic_request {
	struct ceph_mon_client *monc;
	struct kref kref;
	u64 tid;
	struct rb_node node;
	int result;

	struct completion completion;
	ceph_monc_callback_t complete_cb;
	u64 private_data;          /* r_tid/linger_id */

	struct ceph_msg *request;  /* original request */
	struct ceph_msg *reply;    /* and reply */

	union {
		struct ceph_statfs *st;
		u64 newest;
	} u;
};

struct ceph_mon_client {
	struct ceph_client *client;
	struct ceph_monmap *monmap;

	struct mutex mutex;
	struct delayed_work delayed_work;

	struct ceph_auth_client *auth;
	struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
	int pending_auth;

	bool hunting;
	int cur_mon;                       /* last monitor i contacted */
	unsigned long sub_renew_after;
	unsigned long sub_renew_sent;
	struct ceph_connection con;

	bool had_a_connection;
	int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */

	/* pending generic requests */
	struct rb_root generic_request_tree;
	u64 last_tid;

	/* subs, indexed with CEPH_SUB_* */
	struct {
		struct ceph_mon_subscribe_item item;
		bool want;
		u32 have; /* epoch */
	} subs[3];
	int fs_cluster_id; /* "mdsmap.<id>" sub */

#ifdef CONFIG_DEBUG_FS
	struct dentry *debugfs_file;
#endif
};

extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
extern int ceph_monmap_contains(struct ceph_monmap *m,
				struct ceph_entity_addr *addr);

extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
extern void ceph_monc_stop(struct ceph_mon_client *monc);

enum {
	CEPH_SUB_MDSMAP = 0,
	CEPH_SUB_MONMAP,
	CEPH_SUB_OSDMAP,
};

extern const char *ceph_sub_str[];

/*
 * The model here is to indicate that we need a new map of at least
 * epoch @epoch, and also call in when we receive a map.  We will
 * periodically rerequest the map from the monitor cluster until we
 * get what we want.
 */
bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
			bool continuous);
void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
void ceph_monc_renew_subs(struct ceph_mon_client *monc);

extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
				 unsigned long timeout);

extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
			       struct ceph_statfs *buf);

int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
			  u64 *newest);
int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
				ceph_monc_callback_t cb, u64 private_data);

extern int ceph_monc_open_session(struct ceph_mon_client *monc);

extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);

#endif
Commit	Line	Data
ba75bb98 SW	1	#ifndef _FS_CEPH_MON_CLIENT_H
	2	#define _FS_CEPH_MON_CLIENT_H
	3
	4	#include <linux/completion.h>
3143edd3	5	#include <linux/kref.h>
85ff03f6	6	#include <linux/rbtree.h>
ba75bb98	7
a1ce3928	8	#include <linux/ceph/messenger.h>
ba75bb98 SW	9
	10	struct ceph_client;
	11	struct ceph_mount_args;
4e7a5dcd	12	struct ceph_auth_client;
ba75bb98 SW	13
	14	/*
	15	* The monitor map enumerates the set of all monitors.
	16	*/
	17	struct ceph_monmap {
	18	struct ceph_fsid fsid;
	19	u32 epoch;
	20	u32 num_mon;
	21	struct ceph_entity_inst mon_inst[0];
	22	};
	23
	24	struct ceph_mon_client;
f8c76f6f	25	struct ceph_mon_generic_request;
ba75bb98 SW	26
	27
	28	/*
	29	* Generic mechanism for resending monitor requests.
	30	*/
	31	typedef void (ceph_monc_request_func_t)(struct ceph_mon_client monc,
	32	int newmon);
	33
	34	/* a pending monitor request */
	35	struct ceph_mon_request {
	36	struct ceph_mon_client *monc;
	37	struct delayed_work delayed_work;
	38	unsigned long delay;
	39	ceph_monc_request_func_t do_request;
	40	};
	41
d0b19705 ID	42	typedef void (ceph_monc_callback_t)(struct ceph_mon_generic_request );
d0b19705 ID	43
ba75bb98	44	/*
7a6fdeb2	45	* ceph_mon_generic_request is being used for the statfs and
513a8243 ID	46	* mon_get_version requests which are being done a bit differently
513a8243 ID	47	* because we need to get data back to the caller
ba75bb98	48	*/
f8c76f6f	49	struct ceph_mon_generic_request {
d0b19705	50	struct ceph_mon_client *monc;
3143edd3	51	struct kref kref;
ba75bb98	52	u64 tid;
85ff03f6	53	struct rb_node node;
ba75bb98	54	int result;
d0b19705	55
ba75bb98	56	struct completion completion;
d0b19705 ID	57	ceph_monc_callback_t complete_cb;
	58	u64 private_data; /* r_tid/linger_id */
	59
ba75bb98	60	struct ceph_msg request; / original request */
3143edd3	61	struct ceph_msg reply; / and reply */
d0b19705 ID	62
	63	union {
	64	struct ceph_statfs *st;
	65	u64 newest;
	66	} u;
ba75bb98 SW	67	};
	68
	69	struct ceph_mon_client {
	70	struct ceph_client *client;
	71	struct ceph_monmap *monmap;
	72
	73	struct mutex mutex;
	74	struct delayed_work delayed_work;
	75
4e7a5dcd	76	struct ceph_auth_client *auth;
240ed68e	77	struct ceph_msg m_auth, m_auth_reply, m_subscribe, m_subscribe_ack;
9bd2e6f8	78	int pending_auth;
4e7a5dcd	79
ba75bb98 SW	80	bool hunting;
ba75bb98 SW	81	int cur_mon; /* last monitor i contacted */
82dcabad ID	82	unsigned long sub_renew_after;
82dcabad ID	83	unsigned long sub_renew_sent;
67130934	84	struct ceph_connection con;
ba75bb98	85
168b9090 ID	86	bool had_a_connection;
	87	int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
	88
f8c76f6f YS	89	/* pending generic requests */
f8c76f6f YS	90	struct rb_root generic_request_tree;
ba75bb98 SW	91	u64 last_tid;
ba75bb98 SW	92
82dcabad ID	93	/* subs, indexed with CEPH_SUB_* */
	94	struct {
	95	struct ceph_mon_subscribe_item item;
	96	bool want;
	97	u32 have; /* epoch */
	98	} subs[3];
737cc81e	99	int fs_cluster_id; /* "mdsmap.<id>" sub */
ba75bb98	100
039934b8	101	#ifdef CONFIG_DEBUG_FS
ba75bb98	102	struct dentry *debugfs_file;
039934b8	103	#endif
ba75bb98 SW	104	};
	105
	106	extern struct ceph_monmap ceph_monmap_decode(void p, void *end);
	107	extern int ceph_monmap_contains(struct ceph_monmap *m,
	108	struct ceph_entity_addr *addr);
	109
	110	extern int ceph_monc_init(struct ceph_mon_client monc, struct ceph_client cl);
	111	extern void ceph_monc_stop(struct ceph_mon_client *monc);
	112
82dcabad ID	113	enum {
	114	CEPH_SUB_MDSMAP = 0,
	115	CEPH_SUB_MONMAP,
	116	CEPH_SUB_OSDMAP,
	117	};
	118
	119	extern const char *ceph_sub_str[];
	120
ba75bb98 SW	121	/*
ba75bb98 SW	122	* The model here is to indicate that we need a new map of at least
82dcabad	123	* epoch @epoch, and also call in when we receive a map. We will
ba75bb98 SW	124	* periodically rerequest the map from the monitor cluster until we
	125	* get what we want.
	126	*/
82dcabad ID	127	bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
	128	bool continuous);
	129	void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
42c1b124	130	void ceph_monc_renew_subs(struct ceph_mon_client *monc);
ba75bb98	131
6044cde6 ID	132	extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
6044cde6 ID	133	unsigned long timeout);
ba75bb98	134
ba75bb98 SW	135	extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
	136	struct ceph_statfs *buf);
	137
d0b19705 ID	138	int ceph_monc_get_version(struct ceph_mon_client monc, const char what,
	139	u64 *newest);
	140	int ceph_monc_get_version_async(struct ceph_mon_client monc, const char what,
	141	ceph_monc_callback_t cb, u64 private_data);
513a8243	142
4e7a5dcd SW	143	extern int ceph_monc_open_session(struct ceph_mon_client *monc);
4e7a5dcd SW	144
9bd2e6f8 SW	145	extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
9bd2e6f8 SW	146
ba75bb98	147	#endif