1#ifndef _FS_CEPH_MON_CLIENT_H
2#define _FS_CEPH_MON_CLIENT_H
3
4#include <linux/completion.h>
5#include <linux/kref.h>
6#include <linux/rbtree.h>
7
8#include "messenger.h"
9
10struct ceph_client;
11struct ceph_mount_args;
12struct ceph_auth_client;
13
14/*
15 * The monitor map enumerates the set of all monitors.
16 */
17struct ceph_monmap {
18	struct ceph_fsid fsid;
19	u32 epoch;
20	u32 num_mon;
21	struct ceph_entity_inst mon_inst[0];
22};
23
24struct ceph_mon_client;
25struct ceph_mon_generic_request;
26
27
28/*
29 * Generic mechanism for resending monitor requests.
30 */
31typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
32					 int newmon);
33
34/* a pending monitor request */
35struct 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
42/*
43 * ceph_mon_generic_request is being used for the statfs and poolop requests
44 * which are bening done a bit differently because we need to get data back
45 * to the caller
46 */
47struct ceph_mon_generic_request {
48	struct kref kref;
49	u64 tid;
50	struct rb_node node;
51	int result;
52	void *buf;
53	int buf_len;
54	struct completion completion;
55	struct ceph_msg *request;  /* original request */
56	struct ceph_msg *reply;    /* and reply */
57};
58
59struct ceph_mon_client {
60	struct ceph_client *client;
61	struct ceph_monmap *monmap;
62
63	struct mutex mutex;
64	struct delayed_work delayed_work;
65
66	struct ceph_auth_client *auth;
67	struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
68	int pending_auth;
69
70	bool hunting;
71	int cur_mon;                       /* last monitor i contacted */
72	unsigned long sub_sent, sub_renew_after;
73	struct ceph_connection *con;
74	bool have_fsid;
75
76	/* pending generic requests */
77	struct rb_root generic_request_tree;
78	int num_generic_requests;
79	u64 last_tid;
80
81	/* mds/osd map */
82	int want_next_osdmap; /* 1 = want, 2 = want+asked */
83	u32 have_osdmap, have_mdsmap;
84
85#ifdef CONFIG_DEBUG_FS
86	struct dentry *debugfs_file;
87#endif
88};
89
90extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
91extern int ceph_monmap_contains(struct ceph_monmap *m,
92				struct ceph_entity_addr *addr);
93
94extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
95extern void ceph_monc_stop(struct ceph_mon_client *monc);
96
97/*
98 * The model here is to indicate that we need a new map of at least
99 * epoch @want, and also call in when we receive a map.  We will
100 * periodically rerequest the map from the monitor cluster until we
101 * get what we want.
102 */
103extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
104extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
105
106extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
107
108extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
109			       struct ceph_statfs *buf);
110
111extern int ceph_monc_open_session(struct ceph_mon_client *monc);
112
113extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
114
115extern int ceph_monc_create_snapid(struct ceph_mon_client *monc,
116				   u32 pool, u64 *snapid);
117
118extern int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
119				   u32 pool, u64 snapid);
120
121#endif
122