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 
10 struct ceph_client;
11 struct ceph_mount_args;
12 struct ceph_auth_client;
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;
25 struct ceph_mon_generic_request;
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 
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  */
47 struct 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 
59 struct 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_mdsmap;
83 	int want_next_osdmap; /* 1 = want, 2 = want+asked */
84 	u32 have_osdmap, have_mdsmap;
85 
86 #ifdef CONFIG_DEBUG_FS
87 	struct dentry *debugfs_file;
88 #endif
89 };
90 
91 extern struct ceph_monmap *ceph_monmap_decode(void *p, void *end);
92 extern int ceph_monmap_contains(struct ceph_monmap *m,
93 				struct ceph_entity_addr *addr);
94 
95 extern int ceph_monc_init(struct ceph_mon_client *monc, struct ceph_client *cl);
96 extern void ceph_monc_stop(struct ceph_mon_client *monc);
97 
98 /*
99  * The model here is to indicate that we need a new map of at least
100  * epoch @want, and also call in when we receive a map.  We will
101  * periodically rerequest the map from the monitor cluster until we
102  * get what we want.
103  */
104 extern int ceph_monc_got_mdsmap(struct ceph_mon_client *monc, u32 have);
105 extern int ceph_monc_got_osdmap(struct ceph_mon_client *monc, u32 have);
106 
107 extern void ceph_monc_request_next_osdmap(struct ceph_mon_client *monc);
108 
109 extern int ceph_monc_do_statfs(struct ceph_mon_client *monc,
110 			       struct ceph_statfs *buf);
111 
112 extern int ceph_monc_open_session(struct ceph_mon_client *monc);
113 
114 extern int ceph_monc_validate_auth(struct ceph_mon_client *monc);
115 
116 extern int ceph_monc_create_snapid(struct ceph_mon_client *monc,
117 				   u32 pool, u64 *snapid);
118 
119 extern int ceph_monc_delete_snapid(struct ceph_mon_client *monc,
120 				   u32 pool, u64 snapid);
121 
122 #endif
123