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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
42typedef void (*ceph_monc_callback_t)(struct ceph_mon_generic_request *);
43
44/*
45 * ceph_mon_generic_request is being used for the statfs and
46 * mon_get_version requests which are being done a bit differently
47 * because we need to get data back to the caller
48 */
49struct ceph_mon_generic_request {
50 struct ceph_mon_client *monc;
51 struct kref kref;
52 u64 tid;
53 struct rb_node node;
54 int result;
55
56 struct completion completion;
57 ceph_monc_callback_t complete_cb;
58 u64 private_data; /* r_tid/linger_id */
59
60 struct ceph_msg *request; /* original request */
61 struct ceph_msg *reply; /* and reply */
62
63 union {
64 struct ceph_statfs *st;
65 u64 newest;
66 } u;
67};
68
69struct 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
76 struct ceph_auth_client *auth;
77 struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
78 int pending_auth;
79
80 bool hunting;
81 int cur_mon; /* last monitor i contacted */
82 unsigned long sub_renew_after;
83 unsigned long sub_renew_sent;
84 struct ceph_connection con;
85
86 bool had_a_connection;
87 int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
88
89 /* pending generic requests */
90 struct rb_root generic_request_tree;
91 u64 last_tid;
92
93 /* subs, indexed with CEPH_SUB_* */
94 struct {
95 struct ceph_mon_subscribe_item item;
96 bool want;
97 u32 have; /* epoch */
98 } subs[4];
99 int fs_cluster_id; /* "mdsmap.<id>" sub */
100
101#ifdef CONFIG_DEBUG_FS
102 struct dentry *debugfs_file;
103#endif
104};
105
106extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
107extern int ceph_monmap_contains(struct ceph_monmap *m,
108 struct ceph_entity_addr *addr);
109
110extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
111extern void ceph_monc_stop(struct ceph_mon_client *monc);
112
113enum {
114 CEPH_SUB_MONMAP = 0,
115 CEPH_SUB_OSDMAP,
116 CEPH_SUB_FSMAP,
117 CEPH_SUB_MDSMAP,
118};
119
120extern const char *ceph_sub_str[];
121
122/*
123 * The model here is to indicate that we need a new map of at least
124 * epoch @epoch, and also call in when we receive a map. We will
125 * periodically rerequest the map from the monitor cluster until we
126 * get what we want.
127 */
128bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
129 bool continuous);
130void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
131void ceph_monc_renew_subs(struct ceph_mon_client *monc);
132
133extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
134 unsigned long timeout);
135
136extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
137 struct ceph_statfs *buf);
138
139int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
140 u64 *newest);
141int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
142 ceph_monc_callback_t cb, u64 private_data);
143
144int ceph_monc_blacklist_add(struct ceph_mon_client *monc,
145 struct ceph_entity_addr *client_addr);
146
147extern int ceph_monc_open_session(struct ceph_mon_client *monc);
148
149extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
150
151#endif