1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _FS_CEPH_MON_CLIENT_H
3 #define _FS_CEPH_MON_CLIENT_H
4
5 #include <linux/completion.h>
6 #include <linux/kref.h>
7 #include <linux/rbtree.h>
8
9 #include <linux/ceph/messenger.h>
10
11 struct ceph_client;
12 struct ceph_mount_args;
13 struct ceph_auth_client;
14
15 /*
16 * The monitor map enumerates the set of all monitors.
17 */
18 struct ceph_monmap {
19 struct ceph_fsid fsid;
20 u32 epoch;
21 u32 num_mon;
22 struct ceph_entity_inst mon_inst[] __counted_by(num_mon);
23 };
24
25 struct ceph_mon_client;
26 struct ceph_mon_generic_request;
27
28
29 /*
30 * Generic mechanism for resending monitor requests.
31 */
32 typedef void (*ceph_monc_request_func_t)(struct ceph_mon_client *monc,
33 int newmon);
34
35 /* a pending monitor request */
36 struct ceph_mon_request {
37 struct ceph_mon_client *monc;
38 struct delayed_work delayed_work;
39 unsigned long delay;
40 ceph_monc_request_func_t do_request;
41 };
42
43 typedef void (*ceph_monc_callback_t)(struct ceph_mon_generic_request *);
44
45 /*
46 * ceph_mon_generic_request is being used for the statfs and
47 * mon_get_version requests which are being done a bit differently
48 * because we need to get data back to the caller
49 */
50 struct ceph_mon_generic_request {
51 struct ceph_mon_client *monc;
52 struct kref kref;
53 u64 tid;
54 struct rb_node node;
55 int result;
56
57 struct completion completion;
58 ceph_monc_callback_t complete_cb;
59 u64 private_data; /* r_tid/linger_id */
60
61 struct ceph_msg *request; /* original request */
62 struct ceph_msg *reply; /* and reply */
63
64 union {
65 struct ceph_statfs *st;
66 u64 newest;
67 } u;
68 };
69
70 struct ceph_mon_client {
71 struct ceph_client *client;
72 struct ceph_monmap *monmap;
73
74 struct mutex mutex;
75 struct delayed_work delayed_work;
76
77 struct ceph_auth_client *auth;
78 struct ceph_msg *m_auth, *m_auth_reply, *m_subscribe, *m_subscribe_ack;
79 int pending_auth;
80
81 bool hunting;
82 int cur_mon; /* last monitor i contacted */
83 unsigned long sub_renew_after;
84 unsigned long sub_renew_sent;
85 struct ceph_connection con;
86
87 bool had_a_connection;
88 int hunt_mult; /* [1..CEPH_MONC_HUNT_MAX_MULT] */
89
90 /* pending generic requests */
91 struct rb_root generic_request_tree;
92 u64 last_tid;
93
94 /* subs, indexed with CEPH_SUB_* */
95 struct {
96 struct ceph_mon_subscribe_item item;
97 bool want;
98 u32 have; /* epoch */
99 } subs[4];
100 int fs_cluster_id; /* "mdsmap.<id>" sub */
101
102 #ifdef CONFIG_DEBUG_FS
103 struct dentry *debugfs_file;
104 #endif
105 };
106
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 extern void ceph_monc_reopen_session(struct ceph_mon_client *monc);
113
114 enum {
115 CEPH_SUB_MONMAP = 0,
116 CEPH_SUB_OSDMAP,
117 CEPH_SUB_FSMAP,
118 CEPH_SUB_MDSMAP,
119 };
120
121 extern const char *ceph_sub_str[];
122
123 /*
124 * The model here is to indicate that we need a new map of at least
125 * epoch @epoch, and also call in when we receive a map. We will
126 * periodically rerequest the map from the monitor cluster until we
127 * get what we want.
128 */
129 bool ceph_monc_want_map(struct ceph_mon_client *monc, int sub, u32 epoch,
130 bool continuous);
131 void ceph_monc_got_map(struct ceph_mon_client *monc, int sub, u32 epoch);
132 void ceph_monc_renew_subs(struct ceph_mon_client *monc);
133
134 extern int ceph_monc_wait_osdmap(struct ceph_mon_client *monc, u32 epoch,
135 unsigned long timeout);
136
137 int ceph_monc_do_statfs(struct ceph_mon_client *monc, u64 data_pool,
138 struct ceph_statfs *buf);
139
140 int ceph_monc_get_version(struct ceph_mon_client *monc, const char *what,
141 u64 *newest);
142 int ceph_monc_get_version_async(struct ceph_mon_client *monc, const char *what,
143 ceph_monc_callback_t cb, u64 private_data);
144
145 int ceph_monc_blocklist_add(struct ceph_mon_client *monc,
146 struct ceph_entity_addr *client_addr);
147
148 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
149
150 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
151
152 #endif
153
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