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 <linux/ceph/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
44 * mon_get_version requests which are being done a bit differently
45 * because we need to get data back 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	struct completion completion;
54	struct ceph_msg *request;  /* original request */
55	struct ceph_msg *reply;    /* and reply */
56};
57
58struct ceph_mon_client {
59	struct ceph_client *client;
60	struct ceph_monmap *monmap;
61
62	struct mutex mutex;
63	struct delayed_work delayed_work;
64
65	struct ceph_auth_client *auth;
66	struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
67	int pending_auth;
68
69	bool hunting;
70	int cur_mon;                       /* last monitor i contacted */
71	unsigned long sub_sent, sub_renew_after;
72	struct ceph_connection con;
73
74	/* pending generic requests */
75	struct rb_root generic_request_tree;
76	int num_generic_requests;
77	u64 last_tid;
78
79	/* mds/osd map */
80	int want_mdsmap;
81	int want_next_osdmap; /* 1 = want, 2 = want+asked */
82	u32 have_osdmap, have_mdsmap;
83
84#ifdef CONFIG_DEBUG_FS
85	struct dentry *debugfs_file;
86#endif
87};
88
89extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
90extern int ceph_monmap_contains(struct ceph_monmap *m,
91				struct ceph_entity_addr *addr);
92
93extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
94extern void ceph_monc_stop(struct ceph_mon_client *monc);
95
96/*
97 * The model here is to indicate that we need a new map of at least
98 * epoch @want, and also call in when we receive a map.  We will
99 * periodically rerequest the map from the monitor cluster until we
100 * get what we want.
101 */
102extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
103extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
104
105extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
106extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
107				 unsigned long timeout);
108
109extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
110			       struct ceph_statfs *buf);
111
112extern int ceph_monc_do_get_version(struct ceph_mon_client *monc,
113				    const char *what, u64 *newest);
114
115extern int ceph_monc_open_session(struct ceph_mon_client *monc);
116
117extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
118
119#endif
120